CN210914930U - Rotary switching positioning mechanism for lifting appliance fulcrum - Google Patents

Abstract

The utility model relates to a rotatory positioning mechanism that switches of hoist fulcrum, its characterized in that: the pivot rotating assembly is connected with the fixed mounting seat, the cavity in the fixed mounting seat is provided with a sliding bearing, the upper end surface is provided with a wear pad which is connected with the pivot rotating assembly, the pivot rotating assembly penetrates into the fixed mounting seat through a rotating center shaft, the inner side of the rotating center shaft is of a cavity structure, a long hole is formed in the wall of the rotating center shaft, the pivot rotating positioning assembly is fixed with a rotating shaft, the rotating shaft is connected with the inner cavity of the rotating center shaft, a positioning key slides on a long hole in the rotating center shaft, the lower part of the inner cavity of the fixed mounting seat is provided with an end surface and an inclined surface guide, one side of the fixed mounting seat is provided with a connecting plate which. The structure is closed and compact, and the clamp is accurately positioned; the safety of the positioning assembly is improved, the working efficiency is improved, and the production beat is accelerated.

Description

Rotary switching positioning mechanism for lifting appliance fulcrum

Technical Field

The utility model relates to a rotatory positioning mechanism that switches of hoist fulcrum, especially the different motorcycle types of same hoist need the rotatory positioning mechanism that switches of fulcrum, is that it irritates wax line automobile body hoist design technical field to belong to the automobile coating.

Background

The design requirement of the lifting appliance of the domestic large-scale automobile production line is flexible, the lifting appliance is often required to move or rotate through a fulcrum to meet the supporting requirements of different automobile types, the fulcrum is required to be positioned after rotation at the moment, the existing positioning mode is that the fulcrum is positioned in a mode of rotating a knob plunger piston after rotation, and when the position needs to be changed, a certain force is applied through a rotating device to enable the fulcrum to rotate for a certain angle and then to be positioned.

However, the positioning method in the prior art has certain limitations, because positioning errors are easily caused after the fulcrum is stressed, positioning is not reliable, and accurate positioning is not suitable. And the structure is generally an open structure, wax accumulation and difficult cleaning and rotation are caused when the wax filling line is used, and the clamp positioning holes are not easy to arrange. The positioning is unreliable, danger is easy to occur, the working efficiency is seriously reduced, and the production beat is influenced.

Disclosure of Invention

The utility model aims at providing a rotary switching positioning mechanism for a lifting appliance fulcrum, which solves the problems existing above, avoids inaccurate positioning of the lifting appliance fulcrum due to the influence of external force, and has the advantages of compact structure, accurate positioning, reduced wax accumulation and accurate positioning of a clamp due to the arrangement of a wax filling clamp positioning sleeve at the lower part of the fulcrum; the safety of the positioning assembly is improved, the working efficiency is improved, and the production beat is accelerated.

The technical scheme of the utility model is realized like this: a lifting appliance fulcrum rotation switching positioning mechanism comprises a fixed mounting seat, a fulcrum rotating assembly and a fulcrum rotating positioning assembly; the method is characterized in that: the fulcrum rotating assembly is limited and fixed with the fixed mounting seat through the tension connecting sleeve, a sliding bearing is arranged on the fixed mounting seat, and the fulcrum rotating assembly rotates around the sliding bearing; the fulcrum rotation positioning assembly drives the fulcrum rotation assembly to rotate through a positioning key fixed with the fulcrum rotation positioning assembly, and the compression spring arranged between the fulcrum rotation assembly and the fulcrum rotation positioning assembly restores the original position to enable the positioning key to enter a key slot hole of the fixed mounting seat to be positioned; the inner cavity of the fixed mounting seat is provided with a sliding bearing used for the rotary motion of the fulcrum rotating assembly, the upper end surface of the fixed mounting seat is provided with a wear-resistant pad connected with the fulcrum rotating assembly, the fulcrum rotating assembly penetrates into the fixed mounting seat through a rotary middle shaft and is fixed and limited by an expansion sleeve, so that the fulcrum rotating assembly rotates around the fixed mounting seat, the inner side of the rotary middle shaft is of a cavity structure, the wall of the rotary middle shaft is provided with a long hole, the fulcrum rotating positioning assembly fixes a positioning key and the rotary shaft by a fastener, the rotary shaft is connected with the inner cavity of the rotary middle shaft, the positioning key slides on the long hole of the rotary middle shaft, and the rotary motion drives the fulcrum rotating assembly to rotate, after the fulcrum rotating shaft rotates to a position, the compression spring restores the original position, and the fulcrum rotating positioning assembly is pressed; the lower part of the inner cavity of the fixed mounting seat is provided with an end face and an inclined plane guide which are used for supporting the rotation positioning of the fulcrum pin and the matching positioning of the fulcrum pin and the positioning pin of the wax filling clamp; one side of the fixed mounting seat is provided with a connecting plate connected with the lifting appliance arm, the connecting plate is provided with a long hole, the connecting plate is connected with the lifting appliance arm through a bolt and a positioning pin, and the other side of the fixed mounting seat is a rotating bracket.

The fulcrum rotating assembly comprises a fulcrum supporting pin, a fulcrum pin connecting seat, a rotating middle shaft and a sealing end cover; the sealing end cover is arranged on the fulcrum supporting pin and the fulcrum pin connecting seat, the fulcrum supporting pin and the mounting bottom plate are in a welded or threaded connection structure, and the fulcrum supporting pin and the fulcrum pin connecting seat are in inner hexagonal threaded connection; the inner side hole of the fulcrum pin connecting seat is connected with the rotating middle shaft through an expansion sleeve, and the upper end surface of the inner side hole is connected with the fulcrum supporting pin and used for connecting the fulcrum supporting pin and the rotating middle shaft to rotate integrally; the lower end surface is connected with the fixed mounting seat through the wear-resistant pad to realize rotary motion, and the space of the lower end surface accommodates the positioning locking key to ascend and separate from the fixed mounting seat; the rotary middle shaft penetrates into an inner cavity of the fixed connecting seat from the bottom of the fixed connecting seat, the rotary middle shaft is matched with a direct sliding bearing of the fixed mounting seat, the upper part of the rotary middle shaft is fixed with the fulcrum pin connecting seat through a tensioning sleeve, a long hole is formed in the rotary middle shaft, the inner side of the rotary middle shaft is of a hollow hole structure, a compression spring is arranged at the top of the inner cavity of the rotary middle shaft, and the fulcrum rotary positioning assembly moves up and down on the rotary middle shaft through a positioning key and rotates.

The fulcrum rotating and positioning assembly comprises a rotating pin, a positioning key and a pressing spring; the lower part of the rotating pin is provided with a guide hole and an inner hole, the upper part of the rotating pin is provided with a U-shaped hole for fixing a positioning key, the positioning key is connected with the rotating pin through a screw fastener, and a compression spring is arranged at the top of the rotating middle shaft and compresses the fulcrum rotating positioning assembly; the rotating pin is movably connected with the rotating middle shaft.

A space is arranged in a rotating middle shaft in the fulcrum rotating assembly, and the compression spring is arranged between the rotating middle shaft space and the rotating positioning assembly.

The fixed mounting seat further comprises a fastener, and the fastener is used for connecting, fastening and adjusting the fixed mounting seat and the lifting appliance.

The positioning key slot holes in the fixed mounting seat can be arranged according to the position angles of the supporting points, 1 positioning key slot hole is formed when the fixed mounting seat rotates for 180 degrees, and 3 positioning key slot holes can be arranged when other angles are 2 or more positions.

The fulcrum rotating assembly further comprises a fastener, the fastener fixedly connects the fulcrum supporting pin, the fulcrum pin connecting seat, the rotating middle shaft and the sealing end cover, and the fulcrum rotating assembly integrally rotates around the fixed mounting seat.

The fulcrum rotation positioning assembly further comprises a fastener, and the fastener fixedly connects a positioning key and a rotating pin in the fulcrum rotation positioning assembly to realize that the fulcrum rotation positioning assembly rotates integrally to drive the fulcrum rotation assembly to move.

The fixed mounting seat is provided with 1 or more positioning key slot holes, one end of the fulcrum rotating assembly is connected with the fixed mounting seat through a wear-resistant gasket, the fulcrum rotating positioning assembly is movably connected with the fulcrum rotating assembly through a key, the fulcrum rotating positioning assembly can move up and down along the longitudinal axis of the fulcrum rotating assembly, and the key in the fulcrum rotating positioning assembly is matched with the positioning key slot holes in the fixed mounting seat through a spring for positioning.

The positive effects of the utility model are that owing to decide to have the relative connection relation between mount pad, fulcrum rotating assembly, the fulcrum rotational positioning subassembly, for a cavity type is whole, easily lead to the positioning error after having avoided the fulcrum atress, the location is not too reliable, is not suitable for accurate positioning, uses to lead to long-pending wax, clearance difficulty irritating the wax line, and the work efficiency has been improved to the condition of rotatory difficulty.

Drawings

Fig. 1 is a front view of a rotational positioning switching device according to an embodiment of the present invention.

Fig. 2 is a top view of a rotational positioning switching device according to an embodiment of the present invention.

Fig. 3 is a schematic view of a rotating mechanism assembly.

Fig. 4 is a sectional view of a rotation portion.

Fig. 5 is an elevational view of the fixed mount assembly.

Fig. 6 is an elevational view of the fulcrum rotation assembly.

Fig. 7 is an elevational view of the fulcrum rotation positioning assembly.

Description of the reference numerals

The device comprises a positioning key hole 1, afulcrum rotating assembly 2, a fulcrum rotatingpositioning assembly 3, a fixedmounting seat 4, afulcrum supporting pin 5, a sliding bearing 6, a wear-resistant pad 7, a fulcrumpin connecting seat 8, atensioning sleeve 9, a rotatingpin 10, a rotatingmiddle shaft 11, a sealingend cover 12, apositioning key 13 and acompression spring 14.

Detailed Description

The present invention will be further described with reference to the accompanying drawings; the embodiments described by referring to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Fig. 1 is a front view of the rotational positioning switching device provided in the embodiment of the present invention, fig. 2 is a top view of the rotational positioning switching device provided in the embodiment of the present invention, fig. 3 is a schematic diagram of a rotational mechanism assembly, fig. 4 is a cross-sectional view of a rotational position, fig. 5 is a view of a fixed mount assembly, fig. 6 is a view of a fulcrum rotational assembly, and fig. 7 is a view of a fulcrum rotational positioning assembly.

As shown in fig. 1 to 7, a lifting appliance fulcrum rotation switching positioning mechanism includes afixed mounting seat 4, afulcrum rotation assembly 2, and a fulcrumrotation positioning assembly 3; the method is characterized in that: thefulcrum rotating assembly 2 is limited and fixed with the fixed mounting seat through a tension connecting sleeve, a slidingbearing 6 is arranged on the fixedmounting seat 4, and thefulcrum rotating assembly 2 rotates around the slidingbearing 6; the fulcrumrotation positioning component 3 drives thefulcrum rotation component 3 to rotate through apositioning key 13 fixed with the fulcrumrotation positioning component 3, and thepositioning key 13 enters a key groove hole of thefixed mounting seat 4 to be positioned through acompression spring 14 arranged between thefulcrum rotation component 2 and the fulcrumrotation positioning component 3 to recover the original position; wherein thefixed mounting seat 4, the inner cavity is provided with a slidingbearing 6 for the rotary motion of thefulcrum rotating component 2, the upper end surface of the fixedmounting seat 4 is provided with a wear-resistant pad 7 connected with thefulcrum rotating component 2 to reduce the friction resistance, thefulcrum rotating component 2 penetrates into thefixed mounting seat 4 through the rotatingmiddle shaft 11 and is fixed and limited by anexpansion sleeve 9, so that thefulcrum rotating component 2 rotates around the fixedmounting seat 4, the inner side of the rotatingmiddle shaft 11 is of a cavity structure, the wall of the rotatingmiddle shaft 11 is provided with a long hole, the fulcrum rotatingpositioning component 3 fixes apositioning key 13 and a rotating shaft by a fastener, the rotating shaft is connected with the inner cavity of the rotatingmiddle shaft 11, the bottom of the rotating shaft is subjected to external force to ascend and rotate, so that thepositioning key 13 can slide upwards in the long hole of the rotatingmiddle shaft 11 and the rotating motion drives the fulcrum rotating component, the fulcrum is pressed down to rotate thepositioning component 3, so that thepositioning key 13 enters a key slot hole on the fixedmounting seat 4 to be positioned; the lower part of the inner cavity of the fixedmounting seat 4 is provided with an end face and an inclined plane guide for supporting the pivot pin to rotate and position and matching with the positioning pin of the wax filling clamp to position.

The other side of the fixedmounting seat 4 is provided with a connecting plate connected with a lifting appliance arm, the connecting plate is provided with a long hole and connected with the lifting appliance arm by adopting a bolt and apositioning pin 10 for adjusting the precision size of a fulcrum, the other side of the fixed mounting seat is a rotating bracket seat, and the lower part of the inner cavity of the fixedmounting seat 4 is provided with an end face and an inclined plane guide for being matched with a positioning pin of wax filling clamp equipment; the contact surface of the fixedmounting seat 4 and thefulcrum rotating component 2 is provided with a key slot hole for positioning.

Thefulcrum rotating component 2 comprises afulcrum supporting pin 5, a fulcrumpin connecting seat 8, a rotatingmiddle shaft 11 and a sealingend cover 12; thefulcrum supporting pin 5 is in welded or threaded connection, thefulcrum supporting pin 5 is in threaded connection with the fulcrumpin connecting seat 8, therotary middle shaft 11 is fixed with the fulcrumpin connecting seat 8 through a tensioning sleeve, and the sealingend cover 12 is arranged on thefulcrum supporting pin 5 and the fulcrum pin connecting seat and used for driving thefulcrum supporting pin 5 to rotate and switch;

thesupport pin 5 and the mounting bottom plate are in a welded or threaded connection structure, multi-point support is achieved, the height is adjusted according to the vehicle type, and thesupport pin 5 and the supportpin connecting seat 8 are in inner hexagonal threaded connection;

the inner side hole of the fulcrumpin connecting seat 8 is connected with the rotatingmiddle shaft 11 through an expansion sleeve, and the upper end surface of the fulcrum pin connecting seat is in threaded connection with thefulcrum supporting pin 5 and is used for connecting thefulcrum supporting pin 5 and the rotating middle shaft to rotate integrally; the lower end face is connected with the fixedmounting seat 4 through a wear-resistant pad to realize rotary motion, and a space is arranged on the lower end face to accommodate the lifting of the positioning locking key to separate from the fulcrum mounting seat to realize spacing separation;

therotary middle shaft 11 penetrates into the inner cavity of the fixed connectingseat 4 from the bottom of the fixed connectingseat 4, therotary middle shaft 11 is matched with the fixed mounting seat through a direct sliding bearing, the upper part of therotary middle shaft 11 is matched with the fulcrumpin connecting seat 8 for mounting and positioning, and therotary middle shaft 11 is fixed with the fulcrumpin connecting seat 8 by using thetensioning sleeve 9, so that the disassembly is convenient; therotary middle shaft 11 is provided with a long hole, the inner side of the rotary middle shaft is of a hollow hole structure, thecompression spring 14 is arranged at the top of the inner cavity of therotary middle shaft 11, the initial state is a compression state, and the fulcrumrotary positioning component 3 moves up and down on therotary middle shaft 11 through thepositioning key 13 and rotates to drive therotary middle shaft 11 to move integrally;

the sealingend cover 12 is used for sealing the connectionstandard part 8 between thefulcrum supporting pin 5 and the fulcrum pin connecting seat and preventing wax liquid from entering.

The fulcrumrotation positioning component 3 comprises arotation pin 10, apositioning key 13 and apressing spring 14; the lower part of the rotatingpin 10 is provided with a guide hole and an inner hole, the upper part of the rotating pin is provided with a U-shaped hole for fixing apositioning key 13, thepositioning key 13 is connected with the rotatingpin 10 through a screw fastener, acompression spring 14 is arranged at the top of the rotatingmiddle shaft 11 and compresses the fulcrum rotatingpositioning component 3, the lower part of the rotatingpin 10 is guided to the inner hole and is used in cooperation with other fulcrum opening equipment, the fulcrum rotatingpositioning component 3 firstly performs ascending motion to enable thepositioning key 13 to be separated from a key slot hole of a fixed connecting seat, the fulcrum rotatingpositioning component 3 performs rotating motion, after the fulcrum rotating positioning component is moved in place, the fulcrum rotatingpositioning component 3 descends through thecompression spring 14, thepositioning key 13 enters the key slot hole again for positioning.

The rotatingpin 10 is movably connected with the rotatingmiddle shaft 11, the upper part of the rotating middle shaft is provided with a U-shaped opening with a threaded hole, and thepositioning key 13 is fixedly connected with the rotatingpin 10 through the U-shaped hole by a screw.

A space is arranged in a rotating middle shaft in thefulcrum rotating assembly 2, and acompression spring 14 is arranged between the rotatingmiddle shaft 11 and the rotatingpositioning assembly 2.

The fixedmounting seat 4 further comprises a fastener, and the fastener is used for connecting, fastening and adjusting the fixedmounting seat 4 and the lifting appliance.

The positioning key slot holes in the fixedmounting seat 4 can be arranged according to the position angles of the supporting points, 1 positioning key slot hole is formed when the supporting points rotate for 180 degrees, and 3 positioning key slot holes can be formed when other angles are 2 or more positions.

Thefulcrum rotating assembly 2 further comprises a fastener, the fastener fixedly connects the fulcrum supporting pin, the fulcrum pin connecting seat, the rotating middle shaft and the sealing end cover, and the fulcrum rotating assembly integrally rotates around the fixed mounting seat.

The fulcrumrotation positioning assembly 2 further comprises a fastener, and the fastener fixedly connects a positioning key and a rotating pin in the fulcrum rotation positioning assembly to realize that the fulcrum rotation positioning assembly rotates integrally to drive the fulcrum rotation assembly to move.

The fixedmounting seat 4 is provided with 1 or more positioning key slot holes, one end of the fulcrum rotating assembly is connected with the fixed mounting seat through a wear-resistant gasket, the fulcrum rotatingpositioning assembly 3 is movably connected with thefulcrum rotating assembly 2 through a key, the fulcrum rotatingpositioning assembly 3 can move up and down along the longitudinal axis of thefulcrum rotating assembly 2, and the key in the fulcrum rotatingpositioning assembly 3 is matched with thepositioning key 13 slot holes in the fixedmounting seat 4 through a spring for positioning.

As shown in fig. 5, the last location keyhole 1 of having seted up offixed mounting seat 4, the one end offulcrum rotating assembly 2 is connected throughwear pad 7 with fixedmounting seat 4, fastens into an organic whole throughtight cover 9 and fulcrumpin junction seat 8 that rise throughrotatory axis 11 one side and opposite side, andfulcrum rotating assembly 2 can reciprocate alongrotatory axis 11's slot hole axis of ordinates, makes the location key break away from with the location keyhole and inserts, realizes the locate function, uses the embodiment of the utility model provides a during the rotational positioning switching mechanism, becauselocation key 13,rotatory pin 10,pressure spring 14, have interconnect relation betweenrotatory axis 11 and thefixed mounting seat 4, be a cavity overall structure, compare with prior art, avoided behind the fulcrum atress easily to lead to the positioning error, the location is too unreliable, is not suitable for accurate positioning. The wax filling line has the advantages that the wax is difficult to accumulate, clean and rotate when used, and the working efficiency is improved.

Further, fixedmounting 4 still includeswear pad 7 and slide bearing 6, and wearpad 7 passes through the hole location of fulcrumpin connection seat 8 lower part.

As shown in fig. 6, thefulcrum rotating assembly 2 further includes afulcrum supporting pin 5, a fulcrumpin connecting seat 8, atensioning sleeve 9, a rotatingmiddle shaft 11, and a sliding bearing 12. Thefulcrum supporting pin 5 is fixedly connected with the fulcrumpin connecting seat 8 through a fastener, the fulcrumpin connecting seat 8 is provided with a containing cavity, the rotatingmiddle shaft 11 and the fulcrumpin connecting seat 8 containing cavity are fixedly connected through thetensioning sleeve 9, so that the fulcrum rotating assembly becomes an integral structure, and the rotatingbearing 11 is provided with a long key groove guide hole. Thefulcrum rotating assembly 2 integrally realizes the rotating motion through the sliding bearing 6, thewear pad 7 and the fixed mounting seat.

Furthermore, thefulcrum rotating assembly 2 further comprises acompression spring 14 and a sealingend cover 12, thecompression spring 14 is arranged in the cavity of therotating center shaft 11, thecompression spring 14 is in a compressed state in an initial state when being installed in the positioning hole, that is, when the fulcrum rotatingpositioning assembly 3 is installed in the positioning hole, thecompression spring 14 is in a compressed state, and due to the fact that the fulcrumpin installation seat 8 is fixedly and rotatably connected with the rotatingcenter shaft 11 and thefixed installation seat 4, thecompression spring 14 gives a downward force to the fulcrum rotatingpositioning assembly 3, and thus thepositioning key 13 in the fulcrum rotatingpositioning assembly 3 is forced to be firmly inserted into the positioning key hole 1, so that the fulcrum supporting pin is prevented from being separated from the positioning hole when being subjected to an external force, and the generated safety is improved. And because the mechanism structure is in the cavity, the problem of difficult rotation of the fulcrum pin caused by wax accumulation is avoided.

Further, thefulcrum rotating assembly 2 comprises afulcrum supporting pin 5, and a fulcrumpin connecting seat 8 is fixedly connected with the rotatingmiddle shaft 11. Specifically, the fulcrumpin connecting seat 8 is fixedly connected with therotation middle shaft 11, and thefulcrum supporting pin 5 is fixedly connected with the fulcrumpin connecting seat 8. As will be understood by those skilled in the art, the fulcrumpin connecting seat 8 and therotation center shaft 11 may be connected by an expansion sleeve or fixed by a bolt, and in this embodiment, the expansion sleeve connection is preferred; thefulcrum support pin 5 and the fulcrumpin connecting seat 8 may be welded or bolted, and the welded fixation requires a space for installing a spring installation hole, and in the embodiment, the threaded connection is preferred. The two parts are connected in an expansion sleeve and thread form, so that the disassembly and maintenance are convenient, and the maintenance cost can be reduced to a certain extent.

Furthermore, the fixedmounting seat 4 and the rotatingmiddle shaft 11 rotate, and can be connected by a rolling bearing or a sliding bearing, in this embodiment, the sliding bearing is preferably connected, so that the size of the structural space is saved.

Further, the number of the positioning key holes 1 is 1. It will be appreciated by those skilled in the art that the number of positioning keyholes 1 may be two, three or four, preferably 1 in this embodiment. 180-degree switching positioning of the fulcrum pins is realized, the number of the positioning key holes 1 can be arranged according to needs, and the fulcrum positioning position is used as the standard.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention without departing from the spirit covered by the description and drawings.

Claims (9)

1. A lifting appliance fulcrum rotation switching positioning mechanism comprises a fixed mounting seat, a fulcrum rotating assembly and a fulcrum rotating positioning assembly; the method is characterized in that: the fulcrum rotating assembly is limited and fixed with the fixed mounting seat through the tension connecting sleeve, a sliding bearing is arranged on the fixed mounting seat, and the fulcrum rotating assembly rotates around the sliding bearing; the fulcrum rotation positioning assembly drives the fulcrum rotation assembly to rotate through a positioning key fixed with the fulcrum rotation positioning assembly, and the compression spring arranged between the fulcrum rotation assembly and the fulcrum rotation positioning assembly restores the original position to enable the positioning key to enter a key slot hole of the fixed mounting seat to be positioned; the inner cavity of the fixed mounting seat is provided with a sliding bearing used for the rotary motion of the fulcrum rotating assembly, the upper end surface of the fixed mounting seat is provided with a wear-resistant pad connected with the fulcrum rotating assembly, the fulcrum rotating assembly penetrates into the fixed mounting seat through a rotary middle shaft and is fixed and limited by an expansion sleeve, so that the fulcrum rotating assembly rotates around the fixed mounting seat, the inner side of the rotary middle shaft is of a cavity structure, the wall of the rotary middle shaft is provided with a long hole, the fulcrum rotating positioning assembly fixes a positioning key and the rotary shaft by a fastener, the rotary shaft is connected with the inner cavity of the rotary middle shaft, the positioning key slides on the long hole of the rotary middle shaft, and the rotary motion drives the fulcrum rotating assembly to rotate, after the fulcrum rotating shaft rotates to a position, the compression spring restores the original position, and the fulcrum rotating positioning assembly is pressed; the lower part of the inner cavity of the fixed mounting seat is provided with an end face and an inclined plane guide which are used for supporting the rotation positioning of the fulcrum pin and the matching positioning of the fulcrum pin and the positioning pin of the wax filling clamp; one side of the fixed mounting seat is provided with a connecting plate connected with the lifting appliance arm, the connecting plate is provided with a long hole, the connecting plate is connected with the lifting appliance arm through a bolt and a positioning pin, and the other side of the fixed mounting seat is a rotating bracket.

2. The rotary switching positioning mechanism for the fulcrum of the lifting appliance according to claim 1, wherein the fulcrum rotating component comprises a fulcrum supporting pin, a fulcrum pin connecting seat, a rotating middle shaft and a sealing end cover; the sealing end cover is arranged on the fulcrum supporting pin and the fulcrum pin connecting seat, the fulcrum supporting pin and the mounting bottom plate are in a welded or threaded connection structure, and the fulcrum supporting pin and the fulcrum pin connecting seat are in inner hexagonal threaded connection; the inner side hole of the fulcrum pin connecting seat is connected with the rotating middle shaft through an expansion sleeve, and the upper end surface of the inner side hole is connected with the fulcrum supporting pin and used for connecting the fulcrum supporting pin and the rotating middle shaft to rotate integrally; the lower end surface is connected with the fixed mounting seat through the wear-resistant pad to realize rotary motion, and the space of the lower end surface accommodates the positioning locking key to ascend and separate from the fixed mounting seat; the rotary middle shaft penetrates into an inner cavity of the fixed connecting seat from the bottom of the fixed connecting seat, the rotary middle shaft is matched with a direct sliding bearing of the fixed mounting seat, the upper part of the rotary middle shaft is fixed with the fulcrum pin connecting seat through a tensioning sleeve, a long hole is formed in the rotary middle shaft, the inner side of the rotary middle shaft is of a hollow hole structure, a compression spring is arranged at the top of the inner cavity of the rotary middle shaft, and the fulcrum rotary positioning assembly moves up and down on the rotary middle shaft through a positioning key and rotates.

3. The rotary switching positioning mechanism for a lifting appliance fulcrum according to claim 1, wherein the fulcrum rotary positioning assembly comprises a rotary pin, a positioning key and a compression spring; the lower part of the rotating pin is provided with a guide hole and an inner hole, the upper part of the rotating pin is provided with a U-shaped hole for fixing a positioning key, the positioning key is connected with the rotating pin through a screw fastener, and a compression spring is arranged at the top of the rotating middle shaft and compresses the fulcrum rotating positioning assembly; the rotating pin is movably connected with the rotating middle shaft.

4. The rotary switching positioning mechanism for a lifting appliance fulcrum according to claim 2, wherein a space is provided in the rotary central shaft of the fulcrum rotary assembly, and the compression spring is provided between the rotary central shaft space and the rotary positioning assembly.

5. The mechanism of claim 1, wherein the fixed mounting base further comprises a fastening member for fastening and adjusting the fixed mounting base to the hanger.

6. The rotary switch positioning mechanism for a lifting appliance fulcrum according to claim 1, wherein 1, 2 or 3 positioning key slots are provided in the fixed mounting seat.

7. The spreader fulcrum rotation switching positioning mechanism of claim 2, wherein the fulcrum rotation assembly further comprises a fastener, the fastener fixedly connects the fulcrum support pin, the fulcrum pin connection seat, the rotation center shaft, and the seal end cover, and the fulcrum rotation assembly integrally rotates around the fixed mounting seat.

8. The lifting appliance fulcrum rotation switching positioning mechanism according to claim 3, wherein the fulcrum rotation positioning assembly further comprises a fastener, and the fastener fixedly connects a positioning key and a rotating pin in the fulcrum rotation positioning assembly, so that the fulcrum rotation positioning assembly rotates integrally to drive the fulcrum rotation assembly to move.

9. The lifting appliance fulcrum rotation switching positioning mechanism according to claim 1, wherein the fixed mounting base is provided with 1 or more positioning key slot holes, one end of the fulcrum rotation assembly is connected with the fixed mounting base through a wear-resistant gasket, the fulcrum rotation positioning assembly is movably connected with the fulcrum rotation assembly through a key, wherein the fulcrum rotation positioning assembly can move up and down along the longitudinal axis of the fulcrum rotation assembly, and the key in the fulcrum rotation positioning assembly is matched with the positioning key slot holes in the fixed mounting base through a spring for positioning.

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