CN102418682B - Double-cylinder metering plunger pump and metering method thereof - Google Patents

Abstract

The invention discloses a double-cylinder metering plunger pump and a metering method thereof. The pump comprises a motor, a pump head, ball screws, a drive gear, inductive switches and a base plate, wherein the motor is connected with the drive gear; one side of each of the two ball screws is fixed on a pump head fixing plate of the base plate and the other sides of the two ball screws are connected with the drive gear; a plunger rod is arranged on each of the ball screws; support rods are arranged between front fixing plates of the ball screws and the pump head fixing plate; the inductive switches are respectively arranged at the two ends of one of the support rods; four glue inlet/outlet through holes are formed on the pump head; and one end of each of the through holes is connected with the outside and the other end of each of the through holes are in sealing connection with a plunger rod. In the method, after signals are sensed by the inductive switches, glue inlet/outlet directions are changed by changing the rotation direction of the motor and the direction of a reversing valve on the pump head so as to keep one of two glue inlets/outlets in a glue inlet state and the other one of the two glue inlets/outlets in a glue outlet state. The double-cylinder metering plunger pump is high in control accuracy, glue is stably fed and discharged, and continuous glue outlet is realized.

Description

A kind of twin-tub metering piston pump and method of measurement thereof

Technical field

The present invention relates to point, adhesive injection device design field, particularly a kind of twin-tub metering piston pump and method of measurement thereof.

Background technique

Point, encapsulating have following several for glue mode in the prior art: (1) small quantity plastic emitting, and by air pressure, glue is directly exerted pressure, thereby by the break-make of air pressure, control amount and the pressure of glue; (2) gear pump is controlled plastic emitting, dependence is sealed in two or more gears in a housing, the working space volume-variation producing in intermeshing process is carried the pump of liquid, by rotating speed and the number of turns of control gear pump internal gear, controls plastic emitting glue amount and pressure; (3) screw pump is controlled plastic emitting, by pump housing internal rotor pitch, rotating speed, realizes the control to glue.Several technology have several defects above: (1) air pressure, for glue, is subject to the impact of air pressure stability larger, and very easily the variation because of air pressure impacts gel quantity, and the accuracy of plastic emitting, conformity are difficult to control; (2) pressure of the exhaust port of gear pump depends on the outside size that connects sealant yielding system resistance completely, size and the gel quantity of resistance are inversely proportional to, the large gel quantity of resistance is little, the little gel quantity of resistance is large, can there is because of the size of resistance different capacities of reflux in pump, and in the situation that liquid has particle, very easily gear is caused to wearing and tearing, cannot use in any case, the accuracy of plastic emitting, conformity are difficult to accurate control; (3) screw pump, because stator is rubber product, not wear-resistantly needs periodic replacement, and follow-up service cost improves, and screw pump can produce different capacities of reflux because of the variation of outlet pressure, the accuracy of plastic emitting, conformity are difficult to accurate control.(4) current plastic emitting mode is interruption plastic emitting, i.e. outwards plastic emitting under the effect of pressure again from or a glue-feeder enter glue, externally plastic emitting continuously.

Therefore, need to provide that a kind of control accuracy is high, turnover glue is stable and the metering piston pump of plastic emitting continuously.

Summary of the invention

Main purpose of the present invention is that the shortcoming that overcomes prior art, with not enough, provides a kind of twin-tub metering piston pump, and this device can realize continuous plastic emitting and turnover glue is stable, precision is high.The present invention also provides a kind of method of measurement based on above-mentioned twin-tub metering piston pump.

Object of the present invention realizes by following technological scheme: a kind of twin-tub metering piston pump, comprise motor, pump head, ball screw, driving gear, induction switch, base plate, motor is fixed on the motor fixing plate that is arranged at base plate one side, and pump head is fixed on the pump head fixed plate that is arranged at base plate opposite side; Motor is connected with driving gear by coupling, on the base plate of one end of close motor, be provided with a ball screw front shoe, two ball screw one sides are separately fixed on ball screw front shoe, two ball screw front portions are also connected with driving gear respectively, on each ball screw, be equipped with a plunger rod that can slide thereon, during work, motor drives ball screw by driving gear, makes plunger rod on ball screw, carry out straight line motion; Between ball screw front shoe and pump head fixed plate, be provided with strut, the two ends of a strut arrange respectively an induction switch therein, and two induction switches are all connected with outside controller; On described pump head, be provided with selector valve, pump head upper end is provided with the gum exudation mouth being connected with outside plastic emitting control apparatus, pump head side is provided with and the glue-feeder that enters gluing equipment and be connected, the respectively corresponding glue-feeder of each plunger rod and a gum exudation mouth, and this glue-feeder is all connected selector valve with gum exudation mouth.

When a plunger rod advances, another plunger rod retreats, that is to say that a cylinder is when plastic emitting, another cylinder can enter glue simultaneously, adopt selector valve to control twin-tub and enter gum exudation mouth, can realize the moment exchange of twin-tub turnover glue, thereby realize the uninterrupted glue that supplies, plunger rod produces vacuum when moving backward, thereby makes glue fill up cavity.

As preferred version, described motor is stepper motor.Stepper motor can be controlled by controllor for step-by-step motor, can make device have higher transmission accuracy, and adopts gear to coordinate simultaneously, and turnover glue that can assurance device is accurate.

Preferably, describedly between ball screw front shoe and pump head fixed plate, be provided with strut, the two ends of a strut arrange respectively an induction switch therein, two induction switches are all connected for changing after receiving signal at induction switch into the direction of glue and plastic emitting with outside controller, selector valve is by electromagnetic valve, and solenoid valve, induction switch are all connected with peripheral control unit.Here controller generally adopts PLC controller.

More specifically, described selector valve is air operated reversing valve, air operated reversing valve speed is relatively very fast, 0.05 second/time of the fastest switching speed, and fluid resistance is little, its resistance coefficient equates with the pipeline section of same length, closely reliable, seal face materials is widely used King, sealing is reliable, easy to operate, open and close rapidly, be convenient to remote control.Easy to maintenance, seal ring is all generally movable, and dismounting and change is all more convenient.

Preferably, described device also comprises safety cover, and safety cover and base plate form a confined space, and ball screw, driving gear, induction switch are all arranged in safety cover.Adopt in this way and can prevent danger, reduce dust, the physical life of extension fixture.

A kind of method of measurement based on above-mentioned twin-tub metering piston pump, at the induction switch that is arranged at the two ends of plunger rod direct of travel, sense after signal, by changing the break-make of selector valve on motor sense of rotation and pump head, realize the change of turnover glue direction, keep two plunger rods all the time in a state that enters a plastic emitting of glue.

Specifically comprise the following steps:

(1) controller is after sending the instruction of turnover glue, motor rotates by motor shaft band nutating gear, driving gear drives connected ball screw to rotate and then make plunger rod on ball screw, to carry out straight line motion, and two plunger rods direct of travel on ball screw is contrary;

(2) judged whether that induction switch senses plunger rod, if yes then enter step (3); Otherwise continuing current line precession does;

(3) induction switch sends to controller by induced signal, controller sends to selector valve and the motor on pump head by commutation signal, thereby the corresponding selector valve of the plunger rod that induction switch senses switches break-make mode and changes turnover glue direction, motor changes its sense of rotation, the moving direction of this plunger rod on ball screw is changed, then enter step (1);

(4) complete turnover glue, when controller sends halt instruction, stopping aforesaid operations.

Compared with prior art, tool has the following advantages and beneficial effect in the present invention:

1, the present invention adopts two plunger pumps to complete the work of turnover glue, the direct of travel of two plunger pumps is contrary, one is entered plastic emitting of glue at one time, adopts the state that can guarantee that in this way plunger metering pump all the time can be in plastic emitting, realizes continuous plastic emitting.

2, the motor in the present invention adopts stepper motor to control, and adopts high-precision gear to coordinate simultaneously, and the transmission accuracy of not only having realized parallel bars gapless commutation ，Qie mechanism is also higher.

3, in apparatus of the present invention, adopt ball screw to realize the straight line motion of plunger rod, because ball screw has the feature of highi degree of accuracy, reversibility and high efficiency, high capacity, realized low friction, low noise, thereby can guarantee the working life of mechanical structure.

4, apparatus of the present invention are controlled simply, manually only need operation start, stop and plastic emitting setting parameter, and device internal structure is simple, and the accessory of use is conventional accessory, and not only long service life and follow-up service are safeguarded also more convenient.

Accompanying drawing explanation

Fig. 1 is the sectional structure schematic diagram of apparatus of the present invention;

Fig. 2 is the surface structure schematic diagram of apparatus of the present invention.

In Fig. 1-2: 1-base plate, 2-motor, 3-coupling, 4-motor fixing plate, 5-driving gear, 6-ball screw front shoe, 7-induction switch, 8-ball screw, 9-plunger rod, 10-strut, 11-pump head fixed plate, 12-pump head, 13-gum exudation mouth, 14-glue-feeder, 15-safety cover.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.

Embodiment 1

As illustrated in fig. 1 and 2, a kind of twin-tub metering piston pump, comprise motor 2, pump head 12,safety cover 15 and be arranged on ball screw 8, driving gear 5, induction switch 7, the base plate 1 insafety cover 15, in base plate 1 one sides, be provided with motor fixing plate 4, motor 2 is fixed on motor fixing plate 4, at base plate 1 opposite side, be provided with pump head fixed plate 11, pump head 12 is fixed on pump head fixed plate 11; Motor 2 is connected with driving gear 5 by coupling 3, on the base plate of one end of close motor, be provided with a ball screw front shoe 6, two ball screw one sides are separately fixed on ball screw front shoe 6, two ball screw 8 front portions are also connected with driving gear 5 respectively, on each ball screw, be equipped with a plunger rod that can slide 9 thereon, each plunger rod 9 all joins with the strut 10 being fixedly installed on base plate, during work, motor 2 drives ball screw 8 by driving gear 5, makes plunger rod 9 on ball screw 8, carry out straight line motion; Between ball screw front shoe 6 and pump head fixed plate 11, be provided with strut 10, the two ends of a strut 10 arrange respectively 7, two induction switches of an induction switch and are all connected with outside controller therein; In described pump head 12, be provided with four turnover glue through holes, through hole one end is connected with outside turnover gluing equipment by enteringgum exudation mouth 13,14, and the other end and plunger rod 9 are tightly connected.And as shown in Figure 2, the respectively corresponding glue-feeder 14 of each plunger rod and agum exudation mouth 13, and glue-feeder is all connected selector valve with gum exudation mouth.Thereby can control twin-tub by selector valve, enter gum exudation mouth, can realize the moment exchange of twin-tub turnover glue, thereby realize uninterrupted for glue.

The motor 2 adopting in the present embodiment is stepper motor.Stepper motor can be controlled by controllor for step-by-step motor, can make device have higher transmission accuracy, and adopts gear to coordinate simultaneously, and turnover glue that can assurance device is accurate.

In addition, selector valve is by electromagnetic valve, and solenoid valve, induction switch are all connected with peripheral control unit.In this example, adopt PLC controller to control selector valve and induction switch.

A kind of method of measurement based on above-mentioned twin-tub metering piston pump, at the induction switch that is arranged at the two ends of plunger rod direct of travel, sense after signal, by changing the break-make of selector valve on motor sense of rotation and pump head, realize the change of turnover glue direction, keep two plunger rods all the time in a state that enters a plastic emitting of glue.

Specifically comprise the following steps:

(1) controller is after sending the instruction of turnover glue, motor rotates by motor shaft band nutating gear, driving gear drives connected ball screw to rotate and then make plunger rod on ball screw, to carry out straight line motion, and two plunger rods direct of travel on ball screw is contrary;

(2) judged whether that induction switch senses plunger rod, if yes then enter step (3); Otherwise continuing current line precession does;

(3) induction switch sends to controller by induced signal, controller sends to selector valve and the motor on pump head by commutation signal, thereby the corresponding selector valve of the plunger rod that induction switch senses switches break-make mode and changes turnover glue direction, motor changes its sense of rotation, the moving direction of this plunger rod on ball screw is changed, then enter step (1);

(4) complete turnover glue, when controller sends halt instruction, stopping aforesaid operations.

Above-described embodiment is preferably mode of execution of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (6)

1. a twin-tub metering piston pump, it is characterized in that, comprise motor, pump head, ball screw, driving gear, induction switch, base plate, motor is fixed on the motor fixing plate that is arranged at base plate one side, and pump head is fixed on the pump head fixed plate that is arranged at base plate opposite side; Motor is connected with driving gear by coupling, on the base plate of one end of close motor, be provided with a ball screw front shoe, two ball screw one sides are separately fixed on ball screw front shoe, two ball screw front portions are also connected with driving gear respectively, on each ball screw, be equipped with a plunger rod that can slide thereon, during work, motor drives ball screw by driving gear, makes plunger rod on ball screw, carry out straight line motion; Between ball screw front shoe and pump head fixed plate, be provided with strut, the two ends of a strut arrange respectively an induction switch therein, and two induction switches are all connected with outside controller; On described pump head, be provided with selector valve, pump head upper end is provided with the gum exudation mouth being connected with outside plastic emitting control apparatus, pump head side is provided with and the glue-feeder that enters gluing equipment and be connected, the respectively corresponding glue-feeder of each plunger rod and a gum exudation mouth, and this glue-feeder is all connected selector valve with gum exudation mouth.

2. twin-tub metering piston pump according to claim 1, is characterized in that, described motor is stepper motor.

3. twin-tub metering piston pump according to claim 1, is characterized in that, selector valve is by electromagnetic valve, and solenoid valve is connected with peripheral control unit.

4. twin-tub metering piston pump according to claim 3, is characterized in that, also comprises safety cover, and safety cover and base plate form a confined space, and ball screw, driving gear, induction switch are all arranged in safety cover.

5. the method for measurement based on twin-tub metering piston pump described in claim 1, it is characterized in that, at the induction switch that is arranged at the two ends of plunger rod direct of travel, sense after signal, by changing the break-make of selector valve on motor sense of rotation and pump head, realize the change of turnover glue direction, keep two plunger rods all the time in a state that enters a plastic emitting of glue.

6. the method for measurement of twin-tub metering piston pump according to claim 5, is characterized in that, specifically comprises the following steps:

(1) controller is after sending the instruction of turnover glue, motor rotates by motor shaft band nutating gear, driving gear drives connected ball screw to rotate and then make plunger rod on ball screw, to carry out straight line motion, and two plunger rods direct of travel on ball screw is contrary;

(2) judged whether that induction switch senses plunger rod, if yes then enter step (3); Otherwise continuing current line precession does;

(3) induction switch sends to controller by induced signal, controller sends to selector valve and the motor on pump head by commutation signal, thereby the corresponding selector valve of the plunger rod that induction switch senses switches break-make mode and changes turnover glue direction, motor changes its sense of rotation, the moving direction of this plunger rod on ball screw is changed, then enter step (1);

(4) complete turnover glue, when controller sends halt instruction, stopping aforesaid operations.

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