Pump assembly and dosing machine

Abstract

The invention relates to a set of pumps and a dosing machine. The set of pumps comprises a drive mechanism, in particular a drive motor; a first pump body; a second pump body; and a third pump body.The first and second pump bodies are connected by a transmission link. When the drive motor rotates in one direction, a rotating shaft of the third pump body does not rotate. The drive motor then rotates a rotating shaft of the second pump body, and the second pump body, in turn, rotates a rotating shaft of the first pump body. When the drive motor rotates in a second direction, the rotating shafts of the first and second pump bodies do not rotate. The drive motor then rotates the rotating shaft of the third pump body, and the first and second directions are opposite. (See Fig. 1 for abbreviations.)

Description

Title of the invention: Pump assembly and dosing machine

[0001] REFERS TO A RELATED APPLICATION

[0002] The present application claims priority from patent application No. 202323028820.5, entitled "Pump assembly and dosing machine", filed with the Chinese National Intellectual Property Administration on November 8, 2023. technical field

[0003] The present utility model relates to the technical field of varnish dosing, in particular to a set of pumps and a dosing machine.

[0004] CONTEXT

[0005] After spraying paint onto an automobile or other equipment, a protective varnish layer must be applied. The varnish contains a hardening agent and a thermosetting resin in a specific proportion, and a thinner is added as required. Generally, a dosing machine is used for this purpose. An existing dosing machine is equipped with a set of pumps and a liquid raw material storage module. The pump set is connected to a discharge end of the storage module and driven by a feeding device. The pump set conveys the liquid raw materials to a set of valves connected to the discharge end, where the discharge is then completed.The pump assembly generally comprises three pump bodies; a thermosetting resin, a curing agent, and a thinner are respectively loaded into the three pump bodies. Since the thinner must be added according to customer requirements, at least two motors are generally required to drive the three pump bodies respectively, so that the varnish required by the customers can be prepared, resulting in a relatively high manufacturing cost.

[0006] SUMMARY

[0007] A primary objective of the present utility model is to provide a set of pumps and a dosing machine, which can solve the problem that in an existing dosing machine, a plurality of motors must be arranged to drive a plurality of pump bodies respectively, resulting in a relatively high manufacturing cost.

[0008] To achieve this objective, according to one aspect of the present utility model, a set of pumps is provided. The set of pumps comprises a drive mechanism, in particular a drive motor; a first pump body, designed to extract a first solution; a second pump body, designed to extract a second solution; and a third pump body, designed to extract a diluent, the first pump body and the second pump body are in transmission connection, the second pump body and the third pump body are both in drive connection with the drive motor, when the drive motor begins to rotate in a first direction, a rotating shaft of the third pump body is not rotating, the drive motor drives a rotating shaft of the second pump body, the rotating shaft of the second pump body drives a rotating shaft of the first pump body, when the drive motor begins to rotate in a second direction, the rotating shafts of the first and second pump bodies are not rotating, the drive motor drives the rotating shaft of the third pump body, and the first and second directions are opposite.

[0009] In some embodiments, the pump assembly further comprises a first transmission mechanism and a second transmission mechanism, the drive motor is in drive connection with the second pump body and the third pump body through the first transmission mechanism, and the second pump body is in transmission connection with the first pump body through the second transmission mechanism.

[0010] In some embodiments, the first transmission mechanism comprises a first chain sprocket, a second chain sprocket, a first one-way bearing, a second one-way bearing and a chain, the chain is engaged with a motor shaft of the drive motor, the directions of rotation of the first one-way bearing and the second one-way bearing are opposite, the first chain sprocket is installed on the rotating shaft of the second pump body by means of the first one-way bearing, the second chain sprocket is installed on the rotating shaft of the third pump body by means of the second one-way bearing, the chain surrounds the peripheries of the first chain sprocket and the second chain sprocket, and the first chain sprocket and the second chain sprocket are both engaged with the chain.

[0011] In some embodiments, the second transmission mechanism comprises a first synchronous belt wheel, a second synchronous belt wheel and a synchronous belt, the first synchronous belt wheel is installed on the rotating shaft of the first pump body, the second synchronous belt wheel is installed on the rotating shaft of the second pump body, and the first synchronous belt wheel and the second synchronous belt wheel are in transmission connection by means of the synchronous belt.

[0012] In certain embodiments, the pump assembly further comprises an overload prevention unit; the overload prevention unit is Installed on the drive motor shaft, the overload prevention assembly includes a drive adjustment part and a transmission part; the transmission part engages with the chain, and the drive adjustment part is designed to be able to rotate the transmission part.

[0013] In some embodiments, the drive adjustment part comprises a speed reducer, a fixed seat and a compression structure, a drive shaft is disposed at one output end of the speed reducer, the transmission part, the fixed seat and the compression structure are all installed on the drive shaft, the fixed seat is located between the transmission part and the compression structure, the compression structure is located on one side, at a distance from the speed reducer, the fixed seat, the compression structure has a drive state and a drive relief state, when the compression structure is in the drive state, the compression structure is able to drive the transmission part in rotation, and when the compression structure is in the drive relief state, the compression structure cannot drive the transmission part in rotation.

[0014] In some embodiments, a through hole is formed in the fixed seat, at least one steel ball is disposed in the through hole, the compression structure is designed to be able to exert pressure on the at least one steel ball, a plurality of projections are disposed on a vertex of the transmission part, the plurality of projections are arranged along a circumferential direction of the transmission part at regular intervals, the at least one steel ball is designed to be able to be clamped between two adjacent projections, a drive gear is disposed at the bottom of the transmission, and the drive gear is meshed with the chain.

[0015] In certain embodiments, the compression structure comprises an adjusting piece, an elastic piece, a first pressing plate and a second pressing plate, a first end of the elastic piece comes against the first pressing plate, a second end of the elastic piece comes against the second pressing plate, the second pressing plate comes against one of at least one steel ball at a distance from the transmission part, the adjusting piece is located on one side, at a distance from the second pressing plate, from the first pressing plate, and the adjusting piece is capable of moving along the axial direction of the drive shaft, so as to adjust a position of the first pressing plate on the drive shaft.

[0016] In certain embodiments, the pump assembly further comprises a tensioning mechanism, the tensioning mechanism being located between the first pinion of chain and the second chain sprocket, the tensioning mechanism includes a tension seat and a tension shaft, a band groove is formed in the tension seat, a screw shank is disposed in the band groove in a penetrating manner, a length extension direction of the screw shank is the same as a length extension direction of the band groove, both ends of the screw shank penetrate out of the band groove, one end of the tension shaft is in threaded correspondence with the screw shank, a tension wheel is disposed at the second end of the tension shaft, and the tension wheel is in contact with the chain.

[0017] According to another aspect of the present utility model, a dosing machine is provided, which includes the pump assembly described above, and a liquid storage mechanism, and a liquid discharge end of the liquid storage mechanism communicates with a liquid outlet end of the pump assembly.

[0018] In some embodiments, the liquid storage mechanism comprises a first liquid storage unit, a second liquid storage unit and a third liquid storage unit, a first solution is loaded into the first liquid storage unit, a liquid outlet end of the first liquid storage unit communicates with a liquid inlet end of the first pump body, a second solution is loaded into the second liquid storage unit, a liquid outlet end of the second liquid storage unit communicates with a liquid inlet end of the second pump body, the diluent is loaded into the third liquid storage unit, and a liquid outlet end of the third liquid storage unit communicates with a liquid inlet end of the third pump body.

[0019] By adopting the technical solution of the present utility model, the drive motor rotates in the first direction, the first pump body and the second pump body extract and pump the first solution and the second solution respectively, after mixing, the first solution and the second solution can be hardened to form a varnish, a user can add the thinner to the varnish dosed according to the requirements, when the thinner needs to be added, the drive motor rotates in the second direction, in such a case, the first pump body and the second pump body do not operate, the third pump body operates, and the third pump body extracts and pumps the thinner.Compared to an existing dosing machine, in the present utility model the pump assembly only needs to be driven by a single drive motor; there is no need for a plurality of drive motors. of corresponding transmission structures, which helps to reduce manufacturing costs. Brief description of the drawings

[0020] The accompanying drawings, which form part of this utility model, are used to provide a better understanding of this utility model, and the exemplary embodiments of this utility model and their descriptions are used to explain this utility model but do not constitute undue limitations of this utility model. In the drawings:

[0021] Fig. 1 illustrates a schematic diagram of an overall structure of a dosing machine according to an embodiment of the present utility model.

[0022] Figure [Fig.2] illustrates a schematic diagram of a partial structure of a dosing machine according to an embodiment of the present utility model.

[0023] Figure [Fig. 3] illustrates a schematic diagram of a partial structure from another angle of a dosing machine according to an embodiment of the present utility model.

[0024] Fig. 4 illustrates schematic structure diagrams of an overload prevention assembly and a drive motor according to an embodiment of the present utility model.

[0025] Fig. 5 illustrates schematic structure diagrams from another angle of an overload prevention assembly and a drive motor according to an embodiment of the present utility model.

[0026] Figure 6 illustrates a schematic diagram of a cross-sectional view of an overload prevention assembly and a drive motor according to an embodiment of the present utility model.

[0027] Figure [Fig.7] illustrates a schematic structure diagram of a tensioning mechanism according to an embodiment of the present utility model.

[0028] Figure 8 illustrates a schematic diagram of a cross-sectional view of a tensioning mechanism according to an embodiment of the present utility model.

[0029] Figure [Fig.9] illustrates a schematic diagram of a partial structure of a dosing machine according to an embodiment of the present utility model.

[0030] Fig. 10 illustrates a schematic diagram of a partial structure of a dosing machine according to an embodiment of the present utility model.

[0031] The [Fig. 11] illustrates a partial schematic diagram of a cross-sectional view of a dosing machine of the [Fig. 10].

[0032] Fig. 12 illustrates a schematic diagram of a cross-sectional view of a nozzle stop valve according to an embodiment of the present utility model.

[0033] Figure 13 illustrates a schematic diagram of a partial structure of a dosing machine according to another embodiment of the present utility model.

[0034] The [Fig. 14] illustrates a partial schematic diagram of a cross-sectional view of a dosing machine of the [Fig. 13].

[0035] The drawings include the following reference symbols.

[0036] 1. Drive motor; 2. First pump body; 3. Second body of 1. Pump; 2. Third pump body; 3. First chain sprocket; 4. Second chain sprocket; 5. Second soft-release explosion-proof button; 6. Housing; 9. Chain; 10. First synchronous belt wheel; 11. Second synchronous belt wheel; 12. Synchronous belt; 13. Overload prevention assembly; 14. Speed ​​reducer; 15. Fixed seat; 16. Compression structure; 17. Drive shaft; 18. Through hole; 19. Steel ball; 20. Transmission part; 21. Bulge; 22. Drive gear; 23. Adjusting piece; 24. Elastic piece; 25. First pressing plate; 26. Second pressing plate; 27. Tensioning mechanism; 28. Tensioning seat; 29. ​​Tensioning shaft; 30. Strip groove; 31. Screw rod; 32. Tensioning wheel; 33. Liquid storage mechanism; 34. First liquid storage unit; 35. Second liquid storage unit; 36. Third liquid storage unit; 37. Nozzle paint tube cover; 38. Tray nozzle holder; 39. Three-nozzle column valve assembly; 40. Three-nozzle valve body; 4L. Hose fitting; 42. Paint outlet; 43. Three-nozzle valve stem; 44. Plunger piston nozzle pull rod; 45. First handle; 46. Upper nozzle drive arm; 47. Second handle; 48. Column valve nozzle tension spring seat; 49. First tension spring; 50. Nozzle stop valve; 51.Nozzle shut-off valve key; 52. Nozzle switching guide plate; 53. Second tension spring; 54. Filter; 55. Spray gun; 56. First soft-release explosion-proof button; 57. Bearing; 60. Switching valve drive arm; 70. Switching valve drive shaft; 80. Compression spring deflector plate; 90. Explosion-proof displacement switch; 100. Connector; and 200. Rotating rod.

[0037] DETAILED DESCRIPTION OF THE EMBODIMENT METHODS

[0038] It should be noted that the embodiments and features of the embodiments of this utility model can be combined with one another without conflict. This utility model will now be described in detail with reference to the accompanying drawings and the embodiments.

[0039] As illustrated in Figures 1 to 14, a pump assembly is provided. The pump assembly comprises a drive mechanism, in particular a drive motor 1; a first pump body 2, designed to extract a first solution; a second pump body 3, designed to extract a second solution; and a third pump body 4, designed to extract a diluent.The first pump body 2 and the second pump body 3 are in transmission connection, the second pump body 3 and the third pump body 4 are both in drive connection with the drive motor 1, when the drive motor 1 begins to rotate in one direction, a rotating shaft of the third pump body 4 is not rotating, the drive motor 1 drives a rotating shaft of the second pump body 3, the rotating shaft of the second pump body 3 drives a rotating shaft of the first pump body 2, when the drive motor 1 begins to rotate in a second direction, the rotating shafts of the first pump body 2 and the second pump body 3 do not begin to rotate, the drive motor 1 drives the rotating shaft of the third pump body 4, and the first and second directions are opposite.

[0040] In the embodiment, the first direction is a clockwise direction or a counterclockwise direction, when the first direction is the clockwise direction, the second direction is the counterclockwise direction, and when the first direction is the counterclockwise direction, the second direction is the clockwise direction.The first pump body 2 is designed to extract and inject the first solution, the second pump body 3 is designed to extract and dispense the second solution, the third pump body 4 is designed to extract and dispense the diluent, the first solution can be a thermosetting resin, the second solution can be a curing agent, after mixing, the two can form a varnish through curing, and the diluent can dilute the dosed varnish.When the drive motor 1 begins to rotate in the first direction, the drive motor 1 drives the rotating shaft of the second pump body 3, the second pump body 3 drives the rotating shaft of the first pump body 2, in such a case, the first pump body 2 and the second pump body 3 are in an operating state, the first pump body 2 extracts and pumps the first solution, the second pump body 3 extracts and pumps the second solution, the third pump body 4 does not operate, when the drive motor 1 begins to rotate in the second direction, the drive motor 1 drives the rotating shaft of the third pump body 4, the third pump body 4 is in an operating state, the third pump body 4 extracts and pumps the diluent, and the first pump body 2 and the second pump body 3 are in a non-operating state.

[0041] As described previously, when the paint dispensing is to be carried out, the drive motor 1 is first activated to rotate in the first direction; in such a case, the first pump body 2 and the second pump body 3 extract and pump the first and second solutions respectively. After mixing, the first and second solutions form a liquid varnish, and the varnish is hardened to form a solid varnish after the addition of a thinner. A user can add the thinner to the dispensed varnish as required. When the thinner needs to be added, the drive motor 1 rotates in the second direction. In such a case, the first pump body 2 and the second pump body 3 do not operate, the third pump body 4 operates, and the third pump body 4 extracts and pumps the thinner.Compared to an existing dosing machine, in the present utility model the pump assembly only needs to be driven by a single drive motor 1; there is no need for a plurality of drive motors 1 and corresponding transmission structures, thus reducing manufacturing costs.

[0042] It should be noted that the first pump body 2, the second pump body 3, and the third pump body 4 each have a rotating shaft. A speed ratio between the rotating shafts maintains the liquid outlet velocities of the first pump body 2, the second pump body 3, and the third pump body 4 in a certain proportion, the specific proportion being able to be fixed according to requirements. A rotation angle of the rotating shaft determines a quantity of liquid outlet from the pump body. When the pump assembly of this utility model is applied in actual production, two or three solutions can be mixed in a predefined ratio, according to requirements.

[0043] In one embodiment, the first pump body 2, the second pump body 3 and the third pump body 4 can be a rotary pump, a piston pump, and the like.

[0044] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the pump assembly further comprises a first transmission mechanism and a second transmission mechanism, the drive motor 1 is in drive connection with the second pump body 3 and the third pump body 4 through the first transmission mechanism, and the second pump body 3 is in transmission connection with the first pump body 2 through the second transmission mechanism.

[0045] Thanks to the preceding arrangement, the drive motor 1 can be in drive connection with the second pump body 3 and the third pump body 4, the second pump body 3 can be in transmission connection with the first pump body 2, when the drive motor 1 begins to rotate in the In the first direction, the drive motor 1 drives the rotating shaft of the second pump body 3, the second pump body 3 can drive the rotating shaft of the first pump body 2, when the drive motor 1 enters rotation in the second direction, the drive motor 1 can drive the rotating shaft of the third pump body 4.

[0046] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the first transmission mechanism comprises a first chain sprocket 5, a second chain sprocket 6, a first one-way bearing, a second one-way bearing and a chain 9, the chain 9 is in contact with a motor shaft of the drive motor 1, the directions of rotation of the first one-way bearing and the second one-way bearing are opposite, the first chain sprocket 5 is installed on the rotating shaft of the second pump body 3 by means of the first one-way bearing, the second chain sprocket 6 is installed on the rotating shaft of the third pump body 4 by means of the second one-way bearing, the chain 9 surrounds the peripheries of the first chain sprocket 5 and the second chain sprocket 6, and the first chain sprocket 5 and the second chain sprocket 6 are both in contact with the chain 9.The second transmission mechanism comprises a first synchronous belt wheel 10, a second synchronous belt wheel 11 and a synchronous belt 12, the first synchronous belt wheel 10 is installed on the rotating shaft of the first pump body 2, the second synchronous belt wheel 11 is installed on the rotating shaft of the second pump body 3, and the first synchronous belt wheel 10 and the second synchronous belt wheel 11 are in transmission link via the synchronous belt 12.

[0047] In the embodiment, when the paint dosing is to be carried out, the drive motor 1 begins to rotate in the first direction, the chain 9 drives the first chain sprocket 5 in rotation, the first chain sprocket 5 drives the rotating shaft of the second pump body 3 and the rotating shaft of the first pump body 2 at the same time, in such a case, the first pump body 2 and the second pump body 3 work at the same time and extract and distribute the first solution and the second solution respectively, the second chain sprocket 6 and the second unidirectional bearing are at rest, the second chain sprocket 6 cannot drive the rotating shaft of the third pump body 4 in rotation, and the third pump body 4 does not operate.When the diluent needs to be added, the drive motor 1 begins to rotate in the second direction, in such a case, the first chain sprocket 5 and the first unidirectional bearing are at rest, the first chain sprocket 5 cannot drive the rotating shaft of the second pump body 3 into rotation, the second pump body 3 and the first pump body 2 cannot operate, the chain 9 drives the second into rotation. Chain sprocket 6, and the second chain sprocket 6, drives the rotating shaft of the third pump body 4, so that the third pump body 4 extracts and distributes the thinner. Thanks to the above arrangement, when the third pump body 4 is operating, the first pump body 2 and the second pump 3 are not operating; when the first pump body 2 and the second pump body 3 are operating, the third pump body 4 is not operating, thus completing the paint dosing.

[0048] In one embodiment, a speed ratio between the rotating shaft of the first pump body 2 and the rotating shaft of the second pump body 3 is maintained in a certain proportion, a liquid injection speed ratio between the two is 2:1, a radius ratio of the first synchronous belt wheel 10 to a radius ratio of the second synchronous belt wheel 11 is 2:1, and other ratios may also be adopted.

[0049] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the pump assembly further comprises an overload prevention assembly 13, the overload prevention assembly 13 is installed on the motor shaft of the drive motor 1, the overload prevention assembly 13 comprises a drive adjustment portion and a transmission portion 20, the transmission portion 20 is meshed with the chain 9, and the drive adjustment portion is designed to be able to rotate the transmission portion 20.

[0050] In the embodiment, the drive adjustment part can rotate the transmission part 20, so that the transmission part 20 rotates the chain 9, and then the chain 9 can rotate the first chain sprocket 5 or the second chain sprocket 6.

[0051] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the drive adjustment part comprises a speed reducer 14, a fixed seat 15 and a compression structure 16; a drive shaft 17 is disposed at one output end of the speed reducer 14; the transmission part 20, the fixed seat 15 and the compression structure 16 are all installed on the drive shaft 17; the fixed seat 15 is located between the transmission part 20 and the compression structure 16; the compression structure 16 is located on one side, at a distance from the speed reducer 14 and the fixed seat 15; the compression structure 16 has a drive state and a drive relief state; when the compression structure 16 is in the drive state, the compression structure 16 is capable of rotating the transmission part 20.and when the compression structure 16 is in the drive relief state, the compression structure 16 cannot drive the transmission part 20.

[0052] An existing dosing machine can automatically dispense the curing agent and a thermosetting resin in a defined proportion, and then mix them in a container. However, during operation, since the valve assembly is opened and closed manually after an operator has switched on an electrical device, if the valve assembly is not opened in time for unloading, or if the electrical device is not switched off in time after the valve assembly has been unloaded, the pressure in a line between the pump assembly and the valve assembly will increase, and when the pressure in the line exceeds a safety pressure value for the line, the line will collapse.

[0053] In the embodiment, the compression structure 16 can rotate the transmission part 20, the transmission part 20 rotates to rotate the chain 9, and then the chain 9 can rotate the first chain sprocket 5 or the second chain sprocket 6, and thus the distribution operation of the first solution, the second solution and the diluent is carried out.When the pressure in the pipe is too high, the compression structure 16 is in a drive relief state, and the compression structure 16 cannot drive the transmission part 20 in rotation, so that the first pump body 2, the second pump body 3 and the third pump body 4 are in a non-operating state, the first pump body 2, the second pump body 3 and the third pump body 4 no longer exert drive pressure in the pipe, so as to ensure the safety of the pipe, effectively preventing pipe collapse caused by improper operation.

[0054] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, a through hole 18 is disposed in the fixed seat 15, a steel ball 19 is disposed in the through hole 18, the compression structure 16 is designed to be able to exert pressure on the steel ball 19, a plurality of projections 21 are disposed on a vertex of the transmission portion 20, the plurality of projections 21 are arranged along a circumferential direction of the transmission portion 20 at regular intervals, the steel ball 19 is designed to be able to be clamped between two adjacent projections 21, a drive gear 22 is disposed at the bottom of the transmission portion 20, and the drive gear 22 meshes with the chain 9.

[0055] In the embodiment, the fixed seat 15 rotates with the drive shaft 17, the compression structure 16 presses the steel ball 19 downwards, so that a lower part of the steel ball 19 is pressed between two adjacent projections 21 to rotate the transmission part 20, the transmission part 20 rotates to allow the rotation of the drive gear 22, the drive gear 22 meshes with the chain 9, the chain 9 is engaged with the first chain sprocket 5 and the second chain sprocket 6, so that the drive gear 22 can drive the rotating shafts of the second pump body 3 and the third pump body 4 into rotation at a predetermined speed.

[0056] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, two steel balls 19 are available, in a vertical direction, a top of the steel ball 19 located above is exposed out of the through hole 18, the compression structure 16 can exert pressure on the top of the steel ball 19, a steel ball 19 near the transmission part 20 can be clamped between the two adjacent projections 21, a drive gear 22 is disposed at the bottom of the transmission part 20, and the drive gear 22 meshes with the chain 9.The compression structure 16 includes an adjusting piece 23, an elastic piece 24, a first pressing plate 25 and a second pressing plate 26, a first end of the elastic piece 24 abuts against the first pressing plate 25, a second end of the elastic piece 24 abuts against the second pressing plate 26, the second pressing plate 26 abuts against the steel ball 19 at a distance from the transmission part 20, the adjusting piece 23 is located on one side, at a distance from the second pressing plate 26, from the first pressing plate 25, and the adjusting piece 23 is capable of moving along an axial direction of the drive shaft 17, so as to adjust a position of the first pressing plate 25 on the drive shaft 17.

[0057] In the embodiment, under the action of the elastic part 24, the second pressing plate 26 presses the steel ball 19 downwards to apply a downward force to the steel ball 19. Under the action of the second pressing plate 26, the lower part of the steel ball 19 is pressed between two adjacent projections 21. The fixed seat 15 rotates with the drive shaft 17. The steel ball 19 is clamped between the two adjacent projections 21 to rotate the transmission part 20. The transmission part 20 rotates to allow the rotation of the drive gear 22. The drive gear 22 meshes with the chain 9, and the chain 9 meshes with the first chain sprocket 5 and the second chain sprocket 6, so that the drive gear 22 can drive... rotation the rotating shafts of the second pump body 3 and the third pump body 4 at the predefined speed.The adjusting piece 23 moves along the axial direction of the drive shaft 17 to adjust the position of the first pressing plate 25 on the drive shaft 17, so as to adjust a degree of compression of the elastic part 24, the degree of compression of the elastic part 24 is different, the pressure applied to the second pressing plate 26 by the elastic part 24 is different, the pressure applied to the steel ball 19 by the second. The pressing plate 26 is also different, and thus the driving force of the steel ball 19 on the drive gear 22 can be changed. When the resistance of the liquid in the pipe is greater than the driving force of the steel ball 19 on the drive gear 22, a relative sliding, i.e., a slippage, will occur between the steel ball 19 and the drive gear 22. In such a case, the pressing structure 16 is in a drive relief state, and each pump body no longer applies driving pressure to the pipe, thus ensuring the safety of the pipeline.

[0058] In one embodiment, the elastic part is a compression spring, the adjusting part 23 is a hexagonal nut, by adjusting a position of the hexagonal nut on the drive shaft 17, the position of the first pressing plate 25 on the drive shaft 17 can be adjusted, so that the degree of compression of the elastic part 24 is adjusted, the pressure applied by the elastic part 24 on the second pressing plate 26 is adjusted, then the pressure applied on the steel ball 19 by the second pressing plate 26 is adjusted, the greater the pressure of the second pressing plate 26 on the steel ball 19, the greater the friction force between the steel ball 19 and the two adjacent protrusions 21, the greater the resistance to the liquid that can appear, and an overload protection value of the overload prevention assembly 13 can be changed through the preceding arrangement.

[0059] In one embodiment, a plurality of through holes 18 are available, taking the axis of the drive shaft 17 as the center of the circle, the plurality of through holes 18 are arranged circumferentially on the fixed seat 15, and each through hole 18 has internally a steel ball 19. A roller bearing 57 is disposed on the drive shaft 17, and the transmission part 20 surrounds the outside of the roller bearing 57 and is fixedly connected to the roller bearing 57.

[0060] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the pump assembly further comprises a tensioning mechanism 27. The tensioning mechanism 27 is located between the first chain sprocket 5 and the second chain sprocket 6. The tensioning mechanism 27 comprises a tension seat 28 and a tension shaft 29. A band groove 30 is formed in the tension seat 28. A screw shank 31 is disposed in the band groove 30 in a penetrating manner. The length extension direction of the screw shank 31 is the same as the length extension direction of the band groove 30. Both ends of the screw shank 31 penetrate out of the band groove 30. A first end of the tension shaft 29 is threaded into the screw shank 31. A tension wheel 32 is disposed at a second end of The tension shaft 29, and the tension wheel 32 are in contact with the chain 9.

[0061] In the embodiment, the tension wheel 32 and an external circular surface of the tension shaft 29 are connected by a bearing, the tension wheel 32 is in contact with the chain 9, by rotating the screw rod 31, the tension shaft 29 moves along the direction of length extension of the screw rod 31, and then the firmness of the chain 9 can then be adjusted.

[0062] According to another aspect of the present utility model, a dosing machine is provided, which includes the pump assembly described above, and a liquid storage mechanism 33, and a liquid discharge end of the liquid storage mechanism 33 communicates with a liquid outlet end of the pump assembly.

[0063] In the embodiment, the pump assembly of the dosing machine has all the technical solutions and all the technical effects of the pump assembly described previously, which will not be repeated here.

[0064] As illustrated in Figures 1 to 12, in one embodiment of the present utility model, the liquid storage mechanism 33 comprises a first liquid storage unit 34, a second liquid storage unit 35 and a third liquid storage unit 36, a first solution is loaded into the first liquid storage unit 34, a liquid outlet end of the first liquid storage unit 34 communicates with a liquid inlet end of the first pump body 2, a second solution is loaded into the second liquid storage unit 35, a liquid outlet end of the second liquid storage unit 35 communicates with a liquid inlet end of the second pump body 3, the diluent is loaded into the third liquid storage unit 36,and a liquid outlet end of the third liquid storage unit 36 ​​communicates with a liquid inlet end of the third pump body 4.

[0065] In the embodiment, the first liquid storage unit 34 is connected to a liquid inlet of the first pump body 2, the second liquid storage unit 35 is connected to a liquid inlet of the second pump body 3, and the third liquid storage unit 36 ​​is connected to a liquid inlet of the third pump body 4.

[0066] In one embodiment, the first liquid storage unit 34 is a storage tank, the second liquid storage unit 35 and the third liquid storage unit 36 ​​are flexible bags. The flexible bags can isolate air, thus preventing the exchange of easily volatile or deteriorated liquids. A bag lid is placed on the flexible bag, and the bag lid and the flexible bag are sealed. After adding a second liquid to the flexible bag, the flexible bag is pressed by hand to expel residual gas from a bag opening, and then the bag lid is closed for sealing.

[0067] In one embodiment, the dosing machine comprises at least two liquid storage mechanisms 33. Each pump body and a liquid outlet are connected to the liquid storage mechanisms 33 by pipes. A valve control switch may also be provided. Automatic dosing is adopted, eliminating the need for manual allocation of the proportions of various liquids, thereby improving work efficiency and allocation accuracy, and enhancing product quality. Each pump body has a rotating shaft, which rotates to activate the pump body for extracting and discharging the liquid, such as the pump body in CN203022984U or CN202210266034.X.

[0068] As illustrated in Figures 1 to 14, in one embodiment, the dosing machine further comprises a shell 8 and a cup support seat, the pump assembly is installed in the shell 8, a nozzle paint pipe cover 37 in the form of a vertical plate, a first soft-release explosion-proof button 56 activating the speed reducer 14 to begin rotation in the first direction and a second soft-release explosion-proof button 7 activating the speed reducer 14 to begin rotation in the second direction are arranged on the shell 8, a tray nozzle support 38 is arranged on a plate face on a middle-upper part of the nozzle paint pipe cover 37, a three-nozzle column valve assembly 39 is arranged on the tray nozzle support 38,The three-nozzle column valve assembly 39 comprises a three-nozzle valve body 40 fixed to the tray nozzle support 38; a hose fitting 41 communicating with the liquid outlets of the first pump body 2, the second pump body 3, and the third pump body 4 is disposed on a top of the three-nozzle valve body 40; a paint outlet 42 is disposed at the bottom of the three-nozzle valve body 40; a cavity penetrating to the left and right is disposed in the middle of the three-nozzle valve body 40; a three-nozzle valve stem 43 is disposed in the cavity; the left and right ends of the three-nozzle valve stem 43 protrude from the cavity; each of the left and right ends of the three-nozzle valve stem 43 is connected to a plunger-piston nozzle pull rod 44; an end portion of the plunger-piston nozzle pull rod 44 extends to the front of the three-nozzle column valve assembly 39,To facilitate operation, two plunger nozzle pull rods 44 are connected by means of a first handle 45. To operate the plunger nozzle pull rod 44 more easily and conveniently, an upper nozzle drive arm 46 can be arranged on, each plunger nozzle pull rod 44, the two upper nozzle drive arms 46 are connected by means of a second handle 47, a length of the upper nozzle drive arm 46 is greater than a length of the plunger nozzle pull rod 44, and a rear end of the upper nozzle drive arm 46 is higher than a rear end of the plunger nozzle pull rod 44, so as to facilitate gripping and the exertion of force by an operator.

[0069] When a liquid is to be dispensed, before a disposable plastic cup is placed, the operator pulls down the first handle 45 or the second handle 47, the three-nozzle valve stem 43 rotates in the three-nozzle valve body 40 under the drive of the plunger piston nozzle pull rod 44, a channel in the three-nozzle valve body 40 communicates with the hose fitting 41 and the paint outlet 42, and in such a case, the three-nozzle column valve assembly 39 is in a discharge state.

[0070] As illustrated in Figures 1 to 14, in one embodiment of the present utility model, the dosing machine further comprises a switching valve drive arm 60, a switching valve drive shaft 70, a compression spring deflector plate 80, an explosion-proof displacement switch 90, a connector 100, and a rotating rod 200. The plunger piston nozzle pull rod 44 rotates the nozzle switching guide plate 52, so that the nozzle switching guide plate 52 rotates the switching valve drive arm 60 around the switching valve drive shaft 70. The connector 100 is connected between the switching valve drive arm 60 and the rotating rod 200. The switching valve drive arm 60 pulls the rotating rod 200 for up-and-down movement via the connector. 100 during rotation,The compression spring deflector plate 80 is located at one end, away from the connector 100 and the rotating rod 200. The rotating rod 200 moves up and down, causing the compression spring deflector plate 80 to move. During this movement, the compression spring deflector plate 80 triggers the explosion-proof travel switch 90, so that the speed reducer 14 is in an operational state that can be switched on. In this case, the disposable plastic cup is placed in the cup holder. The speed reducer 14 can be started by pressing the first soft-release explosion-proof button 56. The speed reducer 14 can be reversed by dispensing paint materials in the required proportion or by pressing the second soft-release explosion-proof button 7.and the diluent meeting the requirements is distributed independently.

[0071] The pressing time of the first soft-release explosion-proof button 56 and the second soft-release explosion-proof button 7 can control the quantity dispensed; when the discharge of the three-nozzle column valve assembly 39 is completed, the first handle 45 or the second handle 47 is manually pulled upwards, the three-nozzle valve stem 43 rotates in the opposite direction in the three-nozzle valve body 40 under the drive of the plunger piston nozzle pull rod 44, and the communication of the channel in the three-nozzle valve body 40 with the hose fitting 41 and the paint outlet 42 is interrupted.To facilitate the conversion between the unloaded and unloaded states of the three-nozzle column valve assembly 39, a column valve nozzle tension spring seat 48 is further disposed on the tray nozzle support 38. A first tension spring 49 is disposed on the column valve nozzle tension spring seat 48. One end of the first tension spring 49 is connected to the middle of the plunger nozzle pull rod 44. In the unloaded state, the plunger nozzle pull rod 44 twists downwards, and the first tension spring 49 is in a stretched state. Once unloading is complete, the plunger nozzle pull rod 44 is released, and the plunger nozzle pull rod 44 is under the action of a tensile force from the first tension spring 49. The three-nozzle column valve assembly nozzle 39 returns to the closed state.

[0072] In one embodiment, in order to better isolate the air and prevent air from entering the pipe, the first pump body 2, the second pump body 3, the third pump body 4, and the three-nozzle valve body 40 due to a leak in the three-nozzle column valve assembly 39, causing liquid to solidify in the pipe, the first pump body 2, the second pump body 3, and the third pump body 4, resulting in the abandonment of the pipe, the first pump body 2, the second pump body 3, and the third pump body 4, a nozzle shut-off valve 50 is disposed on each of a pipe between the first pump body 2 and the three-nozzle column valve assembly 39, on a pipe between the second pump body 3 and the three-nozzle column valve assembly 39, and on a pipe between the third pump body 4 and the first pump body 40. 4 and the three-nozzle column valve assembly 39,and the nozzle shut-off valve 50 is installed on the nozzle paint pipe cover 37. The nozzle shut-off valves 50 are three ball valves installed in parallel; one ball valve is installed on each of the lines of the first liquid storage unit 34, the second liquid storage unit 35, and the third liquid storage unit 36, respectively, in order to activate the opening and closing of the nozzle shut-off valve 50 and the valve body simultaneously, a wrench of A nozzle stop valve 51 is installed on a control rod of each of the three ball valves of the nozzle stop valve 50. The upper ends of the three nozzle stop valve keys 51 are connected to a nozzle switch guide plate 52. A lower end of the plunger piston nozzle pull rod 44 has a convex structure. In the process where the plunger piston nozzle pull rod 44 rotates downwards, the convex structure at the lower end of the plunger piston nozzle pull rod 44 pushes against an upper face of the nozzle switch guide plate 52, and the nozzle switch guide plate 52 drives the nozzle stop valve key 51 to open the nozzle stop valve 50 to allow the liquid to pass through the nozzle stop valve 50.

[0073] Once unloading is complete, in order to activate the automatic closure of the nozzle stop valve 50, a second tension spring 53 is disposed between the nozzle stop valve 50 and the nozzle switch guide plate 52, the second tension spring 53 always exerts an upward oblique force on the nozzle switch guide plate 52, at the same time, the first tension spring 49 can also apply a certain tensile force, so that the nozzle stop valve 50 can be closed automatically.

[0074] In addition, a filter 54 and a spray gun 55 are further arranged on the shell 8, and the metered varnish can be sprayed through the spray gun 55 after being filtered through the filter 54. When a paint metering is required, a paint metering cup is placed at the liquid outlet position, the drive motor 1 is energized, so that the drive motor 1 begins to rotate in the first direction, the first liquid and the second liquid in a certain proportion flow from the paint outlet 42 at the liquid outlet position, once an appropriate quantity of liquid has been drawn up, the motor power is stopped, the drive motor 1 is activated to begin to rotate in the second direction, an appropriate quantity of thinner is drawn up, and agitation is carried out for use.

[0075] From the preceding description, it can be seen that the above embodiment of the present utility model makes it possible to obtain the following technical effects: the drive motor rotates in the first direction, the first pump body and the second pump body extract and pump the first and second solutions respectively, after mixing, the first and second solutions form a liquid varnish, the varnish is hardened to form a solid varnish after the addition of the diluent, a user can add the diluent to the varnish dosed according to requirements, when the diluent needs to be added, the drive motor rotates in the second direction, in such a case, the first pump body The second pump body is not operating, while the third pump body is operating, and this third pump body extracts and pumps the diluent. Compared to an existing dosing machine, in this utility model, the entire pump assembly only needs to be driven by a single drive motor; there is no need for multiple drive motors and corresponding transmission structures, thus reducing manufacturing costs.

[0076] It is evident that the embodiments described above are only some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those with ordinary skills in the art, based on the embodiments of the present utility model, without creative effort, will fall within the scope of protection of this utility model.

[0077] It should be noted that the terms used here serve only to describe specific implementation modes and are not intended to limit the implementation modes given by way of example according to this utility model. Unless the context otherwise indicates, the singular forms of the terms used here are understood to include the plural forms. Furthermore, it should be borne in mind that where the terms "contain" and / or "comprise" are used in the description, this indicates the existence of features, steps, operations, devices, assemblies, and / or a combination thereof.

[0078] The foregoing are merely some embodiments of this utility model and are not intended to limit the present utility model, and those skilled in the art may make various modifications and variations. Any modifications, equivalent replacements, improvements, and similar adaptations made in the spirit and principle of this utility model shall fall within the scope of protection of this utility model.

Claims

Claims

1. 1 A pump assembly comprising: a drive mechanism, comprising a drive motor (1); a first pump body (2), configured to extract a first solution; a second pump body (3), configured to extract a second solution; and a third pump body (4), configured to extract a diluent, the first pump body (2) and the second pump body (3) are in transmission connection, the second pump body (3) and the third pump body (4) are both in driving connection with the drive motor (1), when the drive motor (1) rotates in a first direction, a rotating shaft of the third pump body (4) does not rotate, the drive motor (1) rotates a rotating shaft of the second pump body (3), the rotating shaft of the second pump body (3) rotates a rotating shaft of the first pump body (2),when the drive motor (1) rotates in a second direction, the rotating shafts of the first pump body (2) and the second pump body (3) do not rotate, the drive motor (1) drives the rotating shaft of the third pump body (4) to rotate, and the first direction and the second direction are opposite.,

2. 2 The pump assembly of claim 1, wherein the pump assembly further comprises a first transmission mechanism and a second transmission mechanism, the drive motor (1) is in driving connection with the second pump body (3) and the third pump body (4) via the first transmission mechanism, and the second pump body (3) is in transmission connection with the first pump body (2) via the second transmission mechanism.

3. 3 A pump assembly according to claim 2, wherein the first transmission mechanism comprises a first chain sprocket (5), a second chain sprocket (6), a first one-way bearing, a second one-way bearing and a chain (9), the chain (9) is engaged with a motor shaft of the motor drive (1), the rotating directions of the first one-way bearing and the second one-way bearing are opposite, the first chain sprocket (5) is installed on the rotating shaft of the second pump body (3) through the first one-way bearing, the second chain sprocket (6) is installed on the rotating shaft of the third pump body (4) through the second one-way bearing, the chain (9) surrounds the peripheries of the first chain sprocket (5) and the second chain sprocket (6), and the first chain sprocket (5) and the second chain sprocket (6) are both engaged with the chain (9).

4. 4 A pump assembly according to claim 2, wherein the second transmission mechanism comprises a first synchronous belt wheel (10), a second synchronous belt wheel (11) and a synchronous belt (12), the first synchronous belt wheel (10) is installed on the rotating shaft of the first pump body (2), the second synchronous belt wheel (11) is installed on the rotating shaft of the second pump body (3), and the first synchronous belt wheel (10) and the second synchronous belt wheel (11) are in transmission connection via the synchronous belt (12).

5. 5 The pump assembly according to claim 3, wherein the pump assembly further comprises an overload prevention assembly (13), the overload prevention assembly (13) is installed on the motor shaft of the drive motor (1), the overload prevention assembly (13) comprises a drive adjustment part and a transmission part (20), the transmission part (20) is engaged with the chain (9), and the drive adjustment part is configured to be able to rotate the transmission part (20).

6. 6 A pump assembly according to claim 5, wherein the drive adjustment part comprises a speed reducer (14), a fixed seat (15) and a compression structure (16), a drive shaft (17) is provided at an output end of the speed reducer (14), the transmission part (20), the fixed seat (15) and the compression structure (16) are all installed on the drive shaft (17), the fixed seat (15) is located between the transmission part (20) and the compression structure (16), the compression structure (16) is located on one side, away from the speed reducer (14), the transmission part (20), the fixed seat (15 ... gear (14), fixed seat (15), the compression structure (16) has a driving state and a driving relief state, when the compression structure (16) is in the driving state, the compression structure (16) is capable of rotating the transmission part (20), and when the compression structure (16) is in the driving relief state, the compression structure (16) cannot rotate the transmission part (20).

7. 7 The pump assembly according to claim 6, wherein a through hole (18) is formed in the fixed seat (15), at least one steel ball (19) is disposed in the through hole (18), the compression structure (16) is configured to be able to exert pressure on the at least one steel ball (19), a plurality of protrusions (21) are disposed on a top of the transmission part (20), the plurality of protrusions (21) are arranged along a circumferential direction of the transmission part (20) at regular intervals, the at least one steel ball (19) is configured to be able to be clamped between two adjacent protrusions (21), a drive gear (22) is disposed at the bottom of the transmission part (20), and the drive gear (22) is engaged with the chain (9).

8. 8 A pump assembly according to claim 7, wherein the compression structure (16) comprises an adjustment piece (23), an elastic piece (24), a first pressing plate (25) and a second pressing plate (26), a first end of the elastic piece (24) abuts against the first pressing plate (25), a second end of the elastic piece (24) abuts against the second pressing plate (26), the second pressing plate (26) abuts against one of the at least one steel ball (19) away from the transmission part (20), the adjustment piece (23) is located on one side, away from the second pressing plate (26), of the first pressing plate (25), and the adjustment piece (23) is capable of moving along an axial direction of the drive shaft (17), so as to adjust a position of the first pressing plate pressing (25) on the drive shaft (17).

9. 9 A pump assembly according to claim 3, wherein the pump assembly further comprises a tensioning mechanism (27), the tensioning mechanism (27) is located between the first chain sprocket (5) and the second chain sprocket (6), the tensioning mechanism tension (27) comprises a tension seat (28) and a tension shaft (29), a band groove (30) is formed in the tension seat (28), a screw rod (31) is arranged in the band groove (30) in a penetrating manner, a length extension direction of the screw rod (31) is the same as a length extension direction of the band groove (30), both ends of the screw rod (31) penetrate out of the band groove (30), a first end of the tension shaft (29) is in threaded correspondence with the screw rod (31), a tension wheel (32) is arranged at a second end of the tension shaft (29), and the tension wheel (32) is engaged with the chain (9).

10. 10 Dosing machine, comprising: the pump assembly according to one of claims 1 to 9; a liquid storage mechanism (33), and a liquid discharge end of the liquid storage mechanism (33) communicates with a liquid outlet end of the pump assembly.

11. 11 A dosing machine according to claim 10, wherein the The liquid storage mechanism (33) comprises a first liquid storage unit (34), a second liquid storage unit (35) and a third liquid storage unit (36), a first solution is loaded into the first liquid storage unit (34), a liquid outlet end of the first liquid storage unit (34) communicates with a liquid inlet end of the first pump body (2), a second solution is loaded into the second liquid storage unit (35), a liquid outlet end of the second liquid storage unit (35) communicates with a liquid inlet end of the second pump body (3), the diluent is loaded into the third liquid storage unit (36), and a liquid outlet end of the third liquid storage unit (36) communicates with a liquid inlet end of the third pump body (4).