Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understoodThe application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, notFor limiting the application.
E-seal provided by the present application based on block chain intelligence contract signs method, can be applied to as shown in Figure 1Application environment in.Wherein, terminal 102 is communicated with server 104 by network by network.Server 104 obtains firstContract information and the corresponding authority identification of contract information are taken, based on contract information and authority identification generate intelligent contract, the intelligenceIt is stored with E-seal key in contract, then intelligent contract is written in block chain, when the electronics for receiving the transmission of terminal 102When seal signature request, which is signed into request, queue to be verified is added, and by E-seal signature request in areaIt is spread in block chain, the node in block chain knows together to E-seal signature request, and after common recognition passes through, server 104 is obtainedTarget electronic seal key is taken, when the E-seal key agreement in the target electronic seal key and intelligent contract, is executedIntelligent contract, to obtain the electronic contract of signed E-seal.
Wherein, terminal 102 can be, but not limited to be various personal computers, laptop, smart phone, plate electricityBrain, server 104 can be realized with the server cluster of the either multiple server compositions of independent server.
In one embodiment, as shown in Fig. 2, providing a kind of E-seal signatory based on block chain intelligence contractMethod is applied to be illustrated for the server in Fig. 1 in this way, comprising the following steps:
Step S202 obtains contract information and the corresponding authority identification of contract information, based on contract information and authority identificationIntelligent contract is generated, includes E-seal key in intelligent contract.
Wherein, contract information includes contract template mark, essence of a contract, the corresponding field information of essence of a contract and the conjunctionThe data such as the limited time limit with corresponding E-seal key, E-seal；Authority identification is corresponding for identifying E-sealSign mechanism.Contract template, essence of a contract and the corresponding field information of essence of a contract may make up a complete electronic contract,In, contract template, essence of a contract are corresponding with business scenario, and the corresponding field information of essence of a contract is corresponding with contract signature user,Business scenario therein for example leases scene, loan scene etc., and essence of a contract refers to the field type of composition contract information, exampleSuch as, borrower, identification card number, address, creditor etc..
In the present embodiment, server, can basis after getting contract information and the corresponding authority identification of contract informationContract information and authority identification generate intelligent contract, and the number such as contract information and authority identification is stored in the intelligent contract of generationAccording to.Wherein, intelligent contract is a kind of computer protocol for being intended to propagate, verify or execute in a manner of information-based contract.Intelligence is closedAbout allow to carry out credible transaction in no third-party situation, these transaction are traceable and irreversible.Intelligent contract is generationThe set of code and data.
Intelligent contract is written in block chain step S204.
Specifically, the both sides to sign a contract, including contract signature user and signature mechanism, it is necessary first to be registered as blockThe user of chain, when succeeding in registration, block chain can return to contract signature user and signature mechanism a pair of public key and private key respectively, work as clothesIt is engaged in after the intelligent contract of device generation, contract signature user and signature mechanism are respectively adopted respective private key and sign to intelligent contractName then will be in the intelligent contract write-in block chain after signature to guarantee the validity of contract.
In one embodiment, intelligent contract is written in block chain server, specifically includes the following steps: server is firstIntelligent contract is diffused into block chain by the mode for first passing through peer-to-peer network, and the node in block chain is total to intelligent contractKnow；When passing through within a preset time to intelligent contract common recognition, block is generated according to intelligent contract；Block is diffused into block chainIn, the node in block chain verifies block, and when being verified, block chain is written in block.
Step S206 receives the E-seal that terminal is sent and signs request, knows together to E-seal signature requestVerification.
Specifically, the corresponding current contract information of electronic contract to be signed and current machine are carried in E-seal signature requestStructure mark, wherein current contract information includes that the corresponding contract template mark of electronic contract to be signed, essence of a contract, contract are wantedThe corresponding field information of element.In one embodiment, before terminal to server sends E-seal signature request, server is neededFirst to generate a electronic contract, electronic contract is sent to terminal, the corresponding contract signature user of terminal to electronic contract intoRow signature, after having signed, the electronic contract of the good name of the label is sent to server by terminal, while sending E-seal to serverSignature request, E-seal signature request are used to indicate the E-seal that server covers contract signature mechanism to electronic contract.
Further, after server receives E-seal signature request, by E-seal signature request in block chainIt is diffused, each node verifies E-seal signature request in block chain, including verifies electronic contract to be signedCorresponding contract information authority identification corresponding with whether identical, the to be signed electronic contract of contract information in intelligent contract with onlyCan whether authority identification in contract identical, E-seal signature requests whether corresponding timestamp arranges in intelligent contractTerm of validity in etc..After verification of most of node to E-seal signature request passes through, it is determined that logical for common recognition verificationIt crosses.
Step S208 obtains target electronic seal key, when target electronic seal key and intelligence after common recognition verification passes throughCan E-seal key agreement in contract when, execute intelligent contract, obtain the electronic contract of signed E-seal.
Specifically, after common recognition passes through, server is obtained according to the current facility mark carried in E-seal signature requestTake corresponding target electronic seal key, when the target electronic seal key that gets with can only E-seal key in contractWhen consistent, intelligent contract is executed, the electronic contract of signed E-seal is obtained.
In one embodiment, for target electronic seal key storage in the memory of server, server can be according to currentE-seal key directly finds target electronic seal key, after finding E-seal key, electronics that server will acquireSeal key is spread in block chain, when nodes most of in block chain pass through the target electronic seal key verification, thenDetermine the E-seal key agreement in the target electronic seal key and intelligent contract, at this point, intelligent contract executes automatically, it is rightElectronic contract is with an official seal affixed, obtains the electronic contract of signed E-seal.
In the above-mentioned E-seal signature method based on block chain intelligence contract, server obtains contract information and conjunction firstThe corresponding authority identification with information, based on contract information and authority identification generate intelligent contract, include electronic seal in intelligent contractIntelligent contract is written in block chain chapter key, when receiving the E-seal signature request that terminal is sent, by E-seal labelAdministration's request is diffused in block chain, and block chain is used to know together to E-seal signature request, after common recognition passes through, is obtainedTarget electronic seal key is taken, when the E-seal key agreement in target electronic seal key and intelligent contract, executes intelligenceCan contract, obtain the electronic contract of signed E-seal, in the application, since the information in block chain can not distort,It therefore will be in contract information and authority identification write-in block chain intelligence contract, it is ensured that data safety, to prevent electronic sealThe mistake signature of chapter.
In one embodiment, E-seal signature request carries current facility mark, obtains target electronic seal keyBefore, comprising: according to the corresponding first E-seal sub-key of current facility identifier lookup, and receive the return of block chain link pointCurrent facility identifies corresponding second E-seal sub-key；Obtain target electronic seal key, comprising: by the first E-sealSub-key is combined with the second E-seal sub-key according to preset sequence, obtains target electronic seal key.
It in the present embodiment, is the safety and compliance that are further ensured that E-seal key, by the corresponding electricity of contractSub- seal key distributed storage is on each node of block chain, and server is after receiving E-seal signature request, meetingE-seal signature request is verified, after verification passes through, according to the current facility mark carried in E-seal signature requestKnow and searches corresponding first E-seal sub-key, meanwhile, E-seal signature request is spread in block chain, in block chainEach node to the E-seal signature request verify, when any one block chain node to E-seal sign requestVerification is when passing through, which can sign the current facility identifier lookup carried in request corresponding the according to E-sealSecond E-seal sub-key is returned to server by two E-seal sub-keys, and after common recognition passes through, server gets moreA E-seal sub-key carries out deduplication operation to these E-seal sub-keys first, then carries out according to preset sequenceCombination, to obtain E-seal key.
In the present embodiment, by the way that E-seal key is carried out distributed storage, server only gets multiple electronicsSeal sub-key could combine to obtain E-seal key, to further ensure safety existing for E-seal key.
In one embodiment, before the E-seal signature request for receiving terminal transmission, comprising: receive what terminal was sentElectronic contract generates request, and electronic contract, which generates, carries scene identity, user identifier in request；It is searched and is corresponded to according to scene identityContract template and essence of a contract；The corresponding field information of essence of a contract is searched according to user identifier；Based on contract template, contractElement and field information generate electronic contract.
Wherein, scene identity is used for identification service scene, business scenario for example to the relevant field of business such as loan, leaseScape；Identity of the user identifier for unique identification contract signature user.After server receives electronic contract generation request, to thisRequest is parsed, wherein the scene identity and user identifier that are carried, then can search corresponding according to scene identityContract template and essence of a contract, wherein contract template refers to that the fixed format for extracting existing contract and/or fixed field obtainTemplate, essence of a contract refers to the variable field type of composition contract, for example, borrower, identification card number, address, creditorEtc..
Further, server can find the corresponding field of each essence of a contract according to user identifier from database and believeBreath, for example, the field information of borrower；Zhang San.Getting contract template, essence of a contract and the corresponding field letter of essence of a contractAfter breath, essence of a contract and field information are written in contract template, to obtain electronic contract.
In the present embodiment, by the way that contract template, essence of a contract is arranged, electronic contract can be quickly generated, electronics is improvedThe formation efficiency of contract.
In one embodiment, based on contract information and authority identification generate intelligent contract, comprising: based on contract information andAuthority identification generates intelligent contract text；It is closed according to the intelligence contract text generation initial intelligent contract, and to the initial intelligentFormal Verification is about carried out, intelligent contract is arrived when being verified.
Wherein, intelligent contract text is to retouch the contract information of natural language description and authority identification by what is formalizedIt states, is converted into the text that the specification of formalization obtains.Formal Verification refers to whether the existing program of verifying meets itThe requirement of specification.It is generally divided into model inspection and verifying of deducing, is based respectively on two kinds of thoughts of state search and theorem proving.
Specifically, server converts contract information and authority identification to the natural language description of rule, i.e. propositional logic,Intelligent contract text has just been obtained, intelligent contract language (such as Solidity language, Yi Zhongzhi are passed through according to intelligent contract textCan contract high-level language) executable code of establishing intelligent contract, initial intelligent contract is obtained, then to initial intelligent contractFormal Verification is carried out, that is, verifies the requirement whether initial intelligent contract meets specification, uses SPIN (Simple PromelaInterpreter is suitable for the assistant analysis detection instrument of parallel system, especially protocol conformance)) tool verified,Promela (modeling language of the SPIN) model for being established initial intelligent contract using concurrent process first, is tested using SPIN toolWhether card Promela model meets the safety of linear time temporal logic (LTL) formula description, judges to execute by verification resultWhether contract meets the requirement of specification, when counter-example occurs in verification result, illustrates intelligent contract existing defects, modifies intelligent contractThe defects of.When verification result is all correct, intelligent contract is obtained.Wherein, the code structure of intelligent contract is divided into structural bodyWith function two parts, structural body has recorded the related data of contract information and authority identification, and function provides answering of externally operatingUse program interface code.
In above-described embodiment, the safety of intelligent contract can be guaranteed without leakage by carrying out Formal Verification to intelligent contractHole.
In one embodiment, as shown in figure 3, in step S204, intelligent contract is written in block chain, comprising:
Intelligent contract is diffused into block chain by step S302 by way of peer-to-peer network, and block chain is used for intelligenceContract is known together.
Wherein, peer-to-peer network, i.e. P2P (Peer to Peer), refer to peer-to-peer computer network, be it is a kind of fellow itBetween distribute the Distributed Application framework of task and workload, a kind of networking or net that be P2P computing model form in application layerNetwork form, feature include decentralization, scalability and high performance-price ratio etc..
Specifically, intelligent contract is spread in block chain the whole network by way of P2P, and block chain node can all receive the intelligenceEnergy contract, and the intelligence contract is saved in memory, wait common recognition.Wherein common recognition is to realize to establish letter between different nodesAppoint, obtain the process of equity.
Step S304, when block chain within a preset time passes through intelligent contract common recognition, according to intelligent contract generation areaBlock.
Specifically, when knowing together the time then, the cryptographic Hash for saving intelligent contract in memory is calculated in block chain node accounting,And block structure is formed by the cryptographic Hash and intelligent contract, which is diffused into other block chain nodes, otherBlock chain node gets the corresponding cryptographic Hash of intelligence contract in block structure, and the cryptographic Hash and the intelligence oneself saved are closedCryptographic Hash about is compared, while the intelligent contract that each block chain node saves oneself is sent to other block chainsIt is compared in node, finally, indicating block chain when all block chain nodes within a preset time reach an agreement to intelligent contractThe common recognition of the intelligence contract is passed through, server generates block according to the intelligence contract, includes following information in block: working as propareaThe cryptographic Hash of block, the cryptographic Hash of previous block, timestamp when reaching common understanding, description information and intelligent contract.
Block is diffused into block chain by S306, and block chain is for verifying block, when being verified, by areaBlock chain is written in block.
Specifically, know together intelligent contract be diffused into the form of block in block chain node, when block chain nodeWhen receiving the intelligence contract, which is verified, verifies contract signature user and contract label in the intelligence contractWhether the private key signature of mechanism, administration matches with the account of block chain node, and when being verified, block chain is written in intelligent contractIn.
In above-described embodiment, intelligent contract is written in block chain by way of common recognition, ensure that intelligent contract notIt can distort.
In one embodiment, before based on contract information and authority identification generate intelligent contract, method includes: to establish in advanceIf intelligent contract template；Based on contract information and authority identification generate intelligent contract, comprising: according to intelligent contract template, contractInformation and authority identification generate intelligent contract.
Wherein, presetting intelligent contract template is established according to the code in intelligent contract with fixed character, is had solidThe code for determining feature refer to have in intelligent contract that based on contract information and authority identification are established identical function, same alike result andThe code segment of same procedure.
Specifically, when generating intelligent contract, the code in intelligent contract with fixed character is extracted, will be extractedThe code come saves in the database, default intelligent contract template is obtained, every time when generating intelligent contract all by intelligent contractIn extracted with the code of fixed character, the code extracted is saved in the database, just will form intelligent contractTemplate library.When server needs to generate intelligent contract, intelligent contract template is searched from database, then according to intelligent contractTemplate, contract information and authority identification generate intelligent contract.For example, being having the same according to the code that authority identification generatesThe code of the part is saved in database by the code of function.When generating intelligent contract, the code of the part is got,As long as modifying the corresponding parameter of authority identification, so that it may the corresponding code of the authority identification in intelligent contract is generated, so as toImprove the formation efficiency of intelligent contract.
It should be understood that although each step in the flow chart of Fig. 2-3 is successively shown according to the instruction of arrow,These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these stepsExecution there is no stringent sequences to limit, these steps can execute in other order.Moreover, at least one in Fig. 2-3Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-stepsCompletion is executed, but can be executed at different times, the execution sequence in these sub-steps or stage is also not necessarily successivelyIt carries out, but can be at least part of the sub-step or stage of other steps or other steps in turn or alternatelyIt executes.
In one embodiment, as shown in figure 4, providing a kind of E-seal signature dress based on block chain intelligence contractSet 400, comprising: intelligent contract generation module 402, writing module 404, E-seal signature request receiving module 406 and intelligenceContract execution module 408, in which:
Intelligent contract generation module 402 is for obtaining contract information and the corresponding authority identification of contract information, based on contractInformation and authority identification generate intelligent contract, include E-seal key in intelligent contract；
Writing module 404 is used to intelligent contract be written in block chain；
E-seal signature request receiving module 406 is used to receive the E-seal signature request of terminal transmission, to electronicsSeal signature request carries out common recognition verification；
Intelligent contract execution module 408 is used to target electronic seal key is obtained, when target electricity after common recognition verification passes throughWhen E-seal key agreement in sub- seal key and intelligent contract, intelligent contract is executed, signed E-seal is obtainedElectronic contract.
In one embodiment, E-seal signature request carries current facility mark, and above-mentioned apparatus further includes electronic sealSeal Key Acquisition Module is used for according to the corresponding first E-seal sub-key of current facility identifier lookup, and receives blockThe current facility that chain node returns identifies corresponding second E-seal sub-key；Intelligent contract execution module is also used to firstE-seal sub-key is combined with the second E-seal sub-key according to preset sequence, and it is close to obtain target electronic sealKey.
In one embodiment, above-mentioned apparatus further include: electronic contract generation module, for receiving the electronics of terminal transmissionContract generates request, and electronic contract, which generates, carries scene identity, user identifier in request；Corresponding conjunction is searched according to scene identityWith template and essence of a contract；The corresponding field information of essence of a contract is searched according to user identifier；Based on contract template, essence of a contractAnd field information generates electronic contract.
In one embodiment, intelligent contract generation module is also used to based on contract information and authority identification generates intelligence and closesAbout text；Formal Verification is carried out according to intelligent contract text generation initial intelligent contract, and to initial intelligent contract, works as verifyingBy when, obtain intelligent contract.
In one embodiment, writing module is also used to by way of peer-to-peer network intelligent contract being diffused into block chainIn, block chain is for knowing together to intelligent contract；When block chain within a preset time passes through intelligent contract common recognition, according toIntelligent contract generates block；Block is diffused into block chain, block chain is for verifying block, when being verified,Block chain is written into block.
In one embodiment, above-mentioned apparatus further includes；Template establishes module, for establishing default intelligent contract template；Intelligent contract generation module is used to generate intelligent contract according to intelligent contract template, contract information and authority identification.
About based on block chain intelligence contract E-seal signature device it is specific limit may refer to above forThe restriction of E-seal signature method based on block chain intelligence contract, details are not described herein.It is above-mentioned intelligently to be closed based on block chainThe modules in E-seal signature device about can be realized fully or partially through software, hardware and combinations thereof.It is above-mentionedEach module can be embedded in the form of hardware or independently of in the processor in computer equipment, can also be stored in a software formIn memory in computer equipment, the corresponding operation of the above modules is executed in order to which processor calls.
In one embodiment, a kind of computer equipment is provided, which can be server, internal junctionComposition can be as shown in Figure 5.The computer equipment include by system bus connect processor, memory, network interface andDatabase.Wherein, the processor of the computer equipment is for providing calculating and control ability.The memory packet of the computer equipmentInclude non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system, computer program and dataLibrary.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.The calculatingThe database of machine equipment is for storing based on data such as contract information, authority identification, E-seal code keys.The computer equipmentNetwork interface is used to communicate with external terminal by network connection.To realize one kind when the computer program is executed by processorE-seal based on block chain intelligence contract signs method.
It will be understood by those skilled in the art that structure shown in Fig. 5, only part relevant to application scheme is tiedThe block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipmentIt may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
In one embodiment, a kind of computer equipment, including memory and processor are provided, which is stored withComputer program, which performs the steps of acquisition contract information when executing computer program and contract information is correspondingAuthority identification, based on contract information and authority identification generate intelligent contract, include E-seal key in intelligent contract；It will be intelligentContract is written in block chain；It receives the E-seal that terminal is sent and signs request, common recognition school is carried out to E-seal signature requestIt tests；After common recognition verification passes through, target electronic seal key is obtained, the electronics in target electronic seal key and intelligent contractWhen seal key agreement, intelligent contract is executed, the electronic contract of signed E-seal is obtained.
In one embodiment, E-seal signature request carries current facility mark, obtains target electronic seal keyBefore, it also performs the steps of when processor executes computer program according to corresponding first electronics of current facility identifier lookupSeal sub-key, and the current facility for receiving the return of block chain link point identifies corresponding second E-seal sub-key；Obtain meshMark E-seal key, comprising: by the first E-seal sub-key and the second E-seal sub-key according to preset sequence intoRow combination, obtains target electronic seal key.
In one embodiment, before receiving the E-seal signature request that terminal is sent, processor executes computer journeyIt is also performed the steps of when sequence and receives the electronic contract generation request that terminal is sent, electronic contract generates in request and carries sceneMark, user identifier；Corresponding contract template and essence of a contract are searched according to scene identity；Contract is searched according to user identifier to wantThe corresponding field information of element；Based on contract template, essence of a contract and field information generate electronic contract.
In one embodiment, based on contract information and authority identification generate intelligent contract, comprising: based on contract information andAuthority identification generates intelligent contract text；According to intelligent contract text generation initial intelligent contract, and to initial intelligent contract intoRow Formal Verification obtains intelligent contract when being verified.
In one embodiment, intelligent contract is written in block chain, comprising: by intelligent conjunction by way of peer-to-peer networkIt is about diffused into block chain, block chain is for knowing together to intelligent contract；When block chain is within a preset time to intelligent contractWhen common recognition passes through, block is generated according to intelligent contract；Block is diffused into block chain, block chain is for testing blockWhen being verified block chain is written in block by card.
In one embodiment, before based on contract information and authority identification generate intelligent contract, processor executes calculatingFoundation default intelligent contract template is also performed the steps of when machine program；Based on contract information and authority identification generate intelligence and closeAbout, comprising: intelligent contract is generated according to intelligent contract template, contract information and authority identification.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculatedMachine program performs the steps of when being executed by processor obtains contract information and the corresponding authority identification of contract information, according to conjunctionIntelligent contract is generated with information and authority identification, includes E-seal key in intelligent contract；Block chain is written into intelligent contractIn；It receives the E-seal that terminal is sent and signs request, common recognition verification is carried out to E-seal signature request；When common recognition verification is logicalLater, target electronic seal key is obtained, when the E-seal key agreement in target electronic seal key and intelligent contract,Intelligent contract is executed, the electronic contract of signed E-seal is obtained.
In one embodiment, E-seal signature request carries current facility mark, obtains target electronic seal keyBefore, it is also performed the steps of when computer program is executed by processor according to corresponding first electricity of current facility identifier lookupSub- seal sub-key, and the current facility for receiving the return of block chain link point identifies corresponding second E-seal sub-key；It obtainsTarget electronic seal key, comprising: by the first E-seal sub-key and the second E-seal sub-key according to preset sequenceIt is combined, obtains target electronic seal key.
In one embodiment, before receiving the E-seal signature request that terminal is sent, computer program is by processorIt is also performed the steps of when execution and receives the electronic contract generation request that terminal is sent, electronic contract generates in request and carries fieldScape mark, user identifier；Corresponding contract template and essence of a contract are searched according to scene identity；Contract is searched according to user identifierThe corresponding field information of element；Based on contract template, essence of a contract and field information generate electronic contract.
In one embodiment, based on contract information and authority identification generate intelligent contract, comprising: based on contract information andAuthority identification generates intelligent contract text；According to intelligent contract text generation initial intelligent contract, and to initial intelligent contract intoRow Formal Verification obtains intelligent contract when being verified.
In one embodiment, intelligent contract is written in block chain, comprising: by intelligent conjunction by way of peer-to-peer networkIt is about diffused into block chain, block chain is for knowing together to intelligent contract；When block chain is within a preset time to intelligent contractWhen common recognition passes through, block is generated according to intelligent contract；Block is diffused into block chain, block chain is for testing blockWhen being verified block chain is written in block by card.
In one embodiment, before based on contract information and authority identification generate intelligent contract, computer program is locatedReason device also performs the steps of foundation default intelligent contract template when executing；Based on contract information and authority identification generate intelligenceContract, comprising: intelligent contract is generated according to intelligent contract template, contract information and authority identification.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be withRelevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computerIn read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,To any reference of memory, storage, database or other media used in each embodiment provided herein,Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may includeRandom access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancingType SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodimentIn each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lanceShield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneouslyIt cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the artIt says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the applicationRange.Therefore, the scope of protection shall be subject to the appended claims for the application patent.