CN218816808U - Pneumatic grease lubricating pump - Google Patents

Abstract

The utility model discloses a pneumatic grease lubricating pump, including the pump seat, still include oil tank, cylinder assembly, check valve and off-load subassembly, be equipped with the main entrance on the pump seat, set up the oil absorption passageway that is linked together with the oil tank on the main entrance inner wall, install the plunger bushing on the main entrance inner wall, the oil absorption hole has been seted up on the plunger bushing, the cylinder assembly includes the casing, be provided with first piston in the casing, first piston separates the casing internal into first air cavity and second air cavity, be equipped with first air inlet and second air inlet on the casing, first piston is connected with the plunger, plunger and plunger bushing sliding fit; an oil outlet channel communicated with the main channel is arranged on the pump base, the one-way valve is matched with the plunger sleeve, a control channel and an unloading channel are arranged on the pump base, and the unloading assembly is arranged in the control channel and used for controlling the opening and closing of the unloading channel. The utility model discloses satisfy the lubricated demand of big discharge capacity high pressure, be applicable to inflammable and explosive occasion, its structural design is reasonable, the reliable operation, the appearance is compact, and with low costs.

Description

Pneumatic grease lubricating pump

Technical Field

The utility model belongs to the technical field of the lubricating pump, specifically speaking relates to a pneumatic grease lubricating pump.

Background

In a single-line grease centralized lubricating system, lubricating pumps with different discharge capacities are matched according to the oil quantity demand of a lubricating point of equipment, in the prior art, a motor (direct current or alternating current) is usually used as an electric grease pump of a power source, and one driving mode is that the motor drives an eccentric wheel to drive a plunger to reciprocate, so that the single-line grease centralized lubricating system is suitable for a small-discharge high-pressure lubricating system; the other driving mode is that the motor directly drives the gear pump to supply oil, and is suitable for a large-discharge low-pressure lubricating system. The following problems exist in the known technology: firstly, in the work of inflammable and explosive environment, need adopt explosion-proof type motor, not only appearance is bulky and the price is expensive. Secondly, current pneumatic grease lubricant pump adopts the design of the first piston cylinder of standard usually, and first piston relies on inside spring to reset during the switching-over, and this kind of structural design axial dimension is great usually, and the cost is difficult to control. There is a limitation in use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adopt two effect piston cylinder as power component's pneumatic grease lubricant pump, the utility model discloses satisfy the lubricated demand of big discharge capacity high pressure, be applicable to inflammable and explosive occasion, its structural design is reasonable, the reliable operation, the appearance is compact, and with low costs.

In order to achieve the above object, the utility model provides a following technical scheme: the pneumatic grease lubricating pump comprises a pump base, an oil tank, a cylinder assembly, a one-way valve and an unloading assembly, wherein the oil tank, the cylinder assembly, the one-way valve and the unloading assembly are arranged on the pump base, a main channel is arranged on the pump base, an oil suction channel communicated with the oil tank is formed in the inner wall of the main channel, a plunger sleeve is arranged on the inner wall of the main channel, an oil suction hole communicated with the oil suction channel is formed in the plunger sleeve, the cylinder assembly comprises a shell arranged on the pump base, a first piston is arranged in the shell in a sliding mode and divides the interior of the shell into a first air cavity and a second air cavity, a first air inlet communicated with the first air cavity and a second air inlet communicated with the second air cavity are formed in the shell, the first piston is connected with a plunger in a linkage mode, and the plunger penetrates through the shell and extends into the main channel and is in sliding fit with the plunger sleeve; the pump seat is provided with an oil outlet channel communicated with the main channel, the one-way valve is matched with the plunger sleeve and only allows oil in the plunger sleeve to enter the oil outlet channel, the pump seat is provided with a control channel communicated with the middle part of the oil outlet channel and an unloading channel communicated with the middle part of the control channel, and the unloading assembly is arranged in the control channel and used for controlling the opening and closing of the unloading channel.

By adopting the technical scheme, when an air source enters from the first air inlet, the double-acting piston type air cylinder starts to work, compressed air enters the first air cavity to push the first piston to move rightwards, the pressure oil agent is compressed to push the one-way valve to be opened while the plunger moves, and the oil agent is pushed to the oil outlet channel from the main channel to finish the oil discharging process; when an air source enters from the second air inlet, compressed air enters the second air cavity to push the first piston to move leftwards, meanwhile, the plunger also moves towards the same direction, the one-way valve is closed, negative pressure is generated inside the plunger sleeve, when the first piston moves to the bottom, the oil absorption process is completed, preparation is made for the next cycle, when the unloading channel is closed by the unloading assembly, oil is conveyed outwards through the oil outlet channel, after oil is discharged by the external metering valve, the oil pump stops working, the unloading channel is opened by the unloading assembly, the oil in the oil outlet channel enters the unloading channel through the control channel, the external metering valve is reset by the spring force, and preparation is made for the next cycle. The structure meets the requirements of large-displacement high-pressure lubrication, has no electric device element, is suitable for inflammable and explosive occasions, has reasonable structural design, reliable work and small axial size, accords with the characteristics of miniaturization and compactness, and has simple structure and low cost.

The utility model discloses further set up to, the plunger includes first plunger section and second plunger section, the one end that first plunger section is close to the second plunger section is equipped with the link junction arch, the one end that the second plunger section is close to first plunger section is equipped with connecting groove, the link junction arch is pegged graft among the connecting groove and the two is in the same place through the pin joint.

Through adopting above-mentioned technical scheme, the processing of segmentation detachable structure more is convenient for, can centerless grinding guaranteed the circularity of excircle, improves the yield, and connects with the pin, and it is very convenient to install, can freely align to can guarantee the concentricity of first plunger section in second plunger section.

The utility model discloses further set up to, first seal groove has been seted up along circumference in the second plunger section, it is used for constituting sealed complex first sealing washer with the plunger bushing inner wall to inlay on the first seal groove.

Through adopting above-mentioned technical scheme, can promote the leakproofness between plunger and the plunger bushing, avoid appearing the finish and leak.

The utility model discloses further set up to, two second seal grooves have been seted up to first piston periphery, it is used for constituting sealed complex sealing member with shells inner wall to inlay on the second seal groove.

Through adopting above-mentioned technical scheme, can guarantee the leakproofness between first piston outer wall and the shells inner wall, guarantee that first piston steady motion under compressed gas's promotion.

The utility model discloses further set up to, the check valve includes first plug screw, one-way disk seat and reset spring, first plug screw threaded connection keeps away from the one end of cylinder subassembly in the main entrance, the inner of first plug screw is equipped with the guide hole, be equipped with on the one-way disk seat in guide hole matched with guide arm, the one-way disk seat is pressed the one end that is close to the check valve at the plunger bushing under reset spring's effect, the one-way disk seat is the toper shape, be equipped with on the plunger bushing with the sealed face of one-way disk seat matched with toper.

By adopting the technical scheme, under the influence of the thrust action of the plunger, the pressure of the oil agent is increased and then the one-way valve seat is pushed open, the one-way valve is opened, the oil agent enters the oil outlet channel, and when the plunger returns, the one-way valve seat is pressed on the conical sealing surface of the plunger sleeve under the action of the reset spring, so that the oil agent in the oil outlet channel is prevented from flowing back.

The utility model discloses further set up to, still include spring holder and second sealing washer, the spring holder cover is established in the guide arm periphery, the second sealing washer clamp is established between spring holder and one-way disk seat, the outer end of guide hole is equipped with the constant head tank, reset spring's one end inlays and establishes in the constant head tank, reset spring's the other end supports on the spring holder.

Through adopting above-mentioned technical scheme, can not only promote the stability of reset spring installation and motion, the setting of second sealing washer can promote the sealing performance when the check valve closes moreover.

The utility model discloses further set up to, the off-load subassembly includes second piston and locating part, the second piston sets up in control channel along endwise slip, the periphery and the inner of second piston are installed respectively and are used for constituting sealed complex third sealing washer and fourth sealing washer with the control channel inner wall, the locating part is installed and is used for spacing to the second piston in the control channel outer end.

By adopting the technical scheme, when the piston is used for continuous lubrication, the second piston is limited by the limiting piece and cannot move. When the oil pump works, the external cylinder is ventilated to push the piston to close the unloading channel, and at the moment, the oil solution is conveyed along the outer end of the oil outlet channel; after the oil is discharged by the external metering valve, the oil pump stops working, at the moment, the external cylinder cuts off air, the second piston is pushed to move rightwards under the action of oil pressure in the oil outlet channel, the unloading channel is opened, and the external metering valve is reset under the action of spring force to prepare for the next cycle.

The utility model discloses further set up to, the locating part is the plug, locating part threaded connection is in the control channel outer end.

By adopting the technical scheme, the disassembly and assembly are very convenient, and the continuous lubrication and pressure relief switching is convenient.

The utility model discloses further set up to, the overflow passageway has still been seted up on the pump seat, the overflow passageway is linked together with the passageway middle part of producing oil, the overflow valve is installed to the outer end of overflow passageway.

Through adopting above-mentioned technical scheme, can adjust the flow in the oil outlet channel, also played certain safe effect of protection simultaneously.

The utility model discloses further set up to, the oil feed passageway has still been seted up on the pump seat, the oil feed passageway is linked together with the oil tank, a joint is all installed to the outer end of oil feed passageway and the passageway that produces oil.

Through adopting above-mentioned technical scheme, the oil filling operation of the oil tank of being convenient for is carried out to the design of oil feed passageway.

Drawings

Fig. 1 is a schematic view of the overall external structure of the present invention;

FIG. 2 is a cross-sectional view of the entire invention;

fig. 3 is a top view of the pump mount of the present invention;

FIG. 4 is a schematic view of the mounting structure of the cylinder assembly and the check valve of the present invention;

fig. 5 is a schematic structural view of the plunger of the present invention;

FIG. 6 is an enlarged view of portion A of FIG. 4;

FIG. 7 is an enlarged view of the portion B of FIG. 4;

fig. 8 is a schematic view of the installation structure of the unloading assembly of the present invention.

In the figure: 1. a pump mount; 3. a cylinder body; 4. a cylinder cover; 5. a first piston; 6. a plunger; 7. a cylinder body seat; 8. a first air cavity; 9. a second air cavity; 10. a first air inlet; 11. a second air inlet; 12. a plunger sleeve; 13. a first plunger section; 14. a second plunger section; 15. a connecting projection; 16. a connecting groove; 17. a pin; 18. a threaded portion; 19. a screw hole; 20. a limiting part; 21. a first seal groove; 22. a first seal ring; 23. a second seal groove; 24. a seal member; 25. a deformation recess; 26. a positioning recess; 27. a positioning projection; 28. an oil tank; 29. a cylinder assembly; 30. a one-way valve; 31. an unloading assembly; 32. a main channel; 35. an oil suction passage; 36. an oil suction hole; 37. a housing; 38. an oil outlet channel; 39. a control channel; 40. an unloading channel; 41. a first plug screw; 42. a one-way valve seat; 43. a return spring; 44. a guide hole; 45. a guide bar; 46. a tapered sealing surface; 47. a spring seat; 48. a second seal ring; 49. positioning a groove; 50. a second piston; 51. a limiting member; 52. a third seal ring; 53. a fourth seal ring; 54. an overflow channel; 55. an overflow valve; 56. an oil inlet channel; 57. and (4) a joint.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): the pneumatic grease lubrication pump shown in fig. 1 to 8 comprises a pump base 1, and further comprises an oil tank 28, a cylinder assembly 29, a one-way valve 30 and an unloading assembly 31 which are arranged on the pump base 1, wherein a main passage 32 is arranged on the pump base 1, an oil suction passage 35 communicated with the oil tank 28 is formed in the inner wall of the main passage 32, a plunger sleeve 12 is arranged on the inner wall of the main passage 32, an oil suction hole 36 communicated with the oil suction passage 35 is formed in the plunger sleeve 12, the cylinder assembly 29 comprises a housing 37 arranged on the pump base 1, a first piston 5 is slidably arranged in the housing 37, the first piston 5 divides the interior of the housing 37 into a first air cavity 8 and a second air cavity 9, a first air inlet 10 communicated with the first air cavity 8 and a second air inlet 11 communicated with the second air cavity 9 are arranged on the housing 37, the first piston 5 is linked with a plunger 6, and the plunger 6 penetrates through the housing 37 and extends into the main passage 32 and is in sliding fit with the plunger sleeve 12; the pump base 1 is provided with an oil outlet channel 38 communicated with the main channel 32, the one-way valve 30 is matched with the plunger sleeve 12 and only allows oil in the plunger sleeve 12 to enter the oil outlet channel 38, the pump base 1 is provided with a control channel 39 communicated with the middle of the oil outlet channel 38 and an unloading channel 40 communicated with the middle of the control channel 39, and the unloading assembly 31 is installed in the control channel 39 and used for controlling the opening and closing of the unloading channel 40. The double-acting piston type cylinder starts to work, compressed gas enters the first air cavity 8 to push the first piston 5 to move rightwards, the pressure oil agent is compressed to push the one-way valve 30 to be opened while the plunger 6 moves, and the oil agent is pushed to the oil outlet channel 38 from the main channel 32 to finish the oil discharging process; when an air source enters from the second air inlet 11, compressed air enters the second air cavity 9 to push the first piston 5 to move leftwards, meanwhile, the plunger 6 also moves towards the same direction, the one-way valve 30 is closed at the moment, negative pressure is generated in the plunger sleeve 12, when the first piston 5 moves to the bottom, the oil absorption process is completed, preparation is made for the next cycle, when the unloading channel 40 is closed by the unloading assembly 31, oil is conveyed outwards by the oil outlet channel 38, after the oil is discharged by the external metering valve, the oil pump stops working, the unloading channel 40 is opened by the unloading assembly 31, the oil in the oil outlet channel 38 enters the unloading channel 40 through the control channel 39, and the external metering valve is reset by the spring force to prepare for the next cycle. The structure meets the requirements of large-displacement high-pressure lubrication, has no electric device element, is suitable for inflammable and explosive occasions, has reasonable structural design, reliable work and small axial size, accords with the characteristics of miniaturization and compactness, and has simple structure and low cost.

Wherein, the plunger 6 is a segmented detachable structure. Because the plunger 6 is a slender shaft, the segmented detachable structure is more convenient to process, the roundness of the outer circle can be ensured by centerless grinding, and the yield is improved. In addition, the plunger 6 may be of an integral structure.

As shown in fig. 4 and 5, the plunger 6 includes a first plunger section 13 and a second plunger section 14 which are coaxially arranged, a connecting protrusion 15 is arranged at one end of the first plunger section 13 close to the second plunger section 14, a connecting groove 16 is arranged at one end of the second plunger section 14 close to the first plunger section 13, the connecting protrusion 15 is inserted into the connecting groove 16, and the two are connected together through a pin 17, that is, a part of the first plunger section 13 corresponding to the connecting protrusion 15 and a part of the second plunger section 14 corresponding to the connecting groove 16 are both provided with shaft holes for the pin 17 to pass through. The pin 17 is used for connection, so that the installation is very convenient, the alignment can be freely realized, and the concentricity of the first plunger section 13 to the second plunger section 14 can be ensured.

Wherein the pin 17 is a split spring pin. The split elastic pin is more beneficial to assembly, and can not fall off along with the abrasion of parts under the elastic influence.

As shown in fig. 4 and 5, a threaded portion 18 is formed on the first plunger section 13, that is, an external thread is lathed on the outer periphery of the first plunger section 13, a screw hole 19 matched with the threaded portion 18 (external thread) is formed on the first piston 5, and a limiting portion 20 for abutting against the outer end of the first piston 5 is formed on the first plunger section 13. Plunger 6 and first piston 5 adopt threaded connection's mode, and connection structure is reliable and stable to the dismouting is very convenient.

As shown in fig. 4 and fig. 5, a first seal groove 21 is formed in the second plunger section 14 along the circumferential direction, and a first seal ring 22 for forming a sealing fit with the inner wall of the plunger sleeve 12 is embedded in the first seal groove 21. This design can promote the leakproofness between plunger 6 and the plunger bushing 12, avoids appearing the finish and leaks.

As shown in fig. 4 and 6, two second seal grooves 23 are formed in the periphery of the first piston 5, and a sealing member 24 for forming a sealing fit with the inner wall of the housing 37 is embedded in the second seal grooves 23. This design can guarantee the leakproofness between first piston 5 outer wall and the casing 37 inner wall, guarantees that first piston 5 steady motion under compressed gas's promotion.

As shown in fig. 4, the housing 37 includes a cylinder body 3, a cylinder cover 4 and a cylinder body seat 7, the cylinder cover 44 and the cylinder body seat 7 are respectively connected to two ends of the cylinder body 33 by threads, and sealing rings for forming a sealing fit with the inner wall of the cylinder body 33 are installed at the positions where the cylinder cover 44 and the cylinder body seat 7 extend into the cylinder body 33. The design connecting structure is very simple, and is convenient for assembly in the early stage and disassembly and maintenance in the later stage.

As shown in fig. 4 and 6, the two seal members 24 are respectively provided with a deformation recess 25 at the end facing away from each other, and the cross section of the seal member 24 corresponding to the deformation recess 25 is wider at one end than at the other end. This design can further improve the sealing between the outer wall of the first piston 5 and the inner wall of the cylinder 3.

As shown in fig. 4, the cylinder block 7 is connected to the pump block 1 by screws, a positioning concave portion 26 is formed on the pump block 1, a positioning convex portion 27 fitted with the positioning concave portion 26 is formed on the cylinder block 7, and a seal ring for forming a sealing fit with the inner periphery of the positioning concave portion 26 is mounted on the outer periphery of the positioning convex portion 27. The design greatly facilitates the installation of the cylinder body seat 7, and the installation structure is stable and reliable.

As shown in fig. 4 and 7, the check valve 30 includes a first screw plug 41, a check valve seat 42, and a return spring 43, the first screw plug 41 is connected to one end of the main passage 32 far from the cylinder assembly 29 through a screw thread, that is, an external screw thread is provided on the periphery of the first screw plug 41, an internal screw thread matching with the external screw thread is provided at the outer end of the main passage 32, a sealing ring is interposed between the first screw plug 41 and the pump seat 1, a guide hole 44 is provided at the inner end of the first screw plug 41, a guide rod 45 matching with the guide hole 44 is provided on the check valve seat 42, the check valve seat 42 is pressed on one end of the plunger sleeve 12 close to the check valve 30 under the action of the return spring 43, the check valve seat 42 is in a conical shape, and a conical sealing surface 46 matching with the check valve seat 42 is provided on the plunger sleeve 12. Under the influence of the thrust action of the plunger 6, the pressure of the oil agent is increased to push away the one-way valve seat 42, the one-way valve 30 is opened, the oil agent enters the oil outlet channel 38, and when the plunger 6 retracts, the one-way valve seat 42 is pressed on the conical sealing surface 46 of the plunger sleeve 12 under the action of the return spring 43, so that the oil agent in the oil outlet channel 38 is prevented from flowing back.

The plunger sleeve 12 is in interference fit with the main channel 32, a limiting flange extending towards the periphery is arranged at one end, close to the one-way valve 30, of the plunger sleeve 12, and a limiting step limiting the limiting flange is arranged on the inner wall of the main channel 32.

As shown in fig. 4 and 7, the check valve 30 further includes a spring seat 47 and a second sealing ring 48, the spring seat 47 is sleeved on the outer periphery of the guide rod 45, the second sealing ring 48 is sandwiched between the spring seat 47 and the check valve seat 42, the outer end of the guide hole 44 is provided with a positioning groove 49, one end of the return spring 43 is embedded in the positioning groove 49, and the other end of the return spring 43 abuts against the spring seat 47. The design not only can improve the stability of installation and movement of the return spring 43, but also can improve the sealing performance when the one-way valve 30 is closed due to the arrangement of the second sealing ring 48.

As shown in fig. 2 and fig. 8, the unloading assembly 31 includes a second piston 50 and a limiting member 51, the second piston 50 is disposed in the control channel 39 in an axially sliding manner, a third sealing ring 52 and a fourth sealing ring 53 for forming a sealing fit with an inner wall of the control channel 39 are respectively mounted on an outer periphery and an inner end of the second piston 50, and the limiting member 51 is mounted on an outer end of the control channel 39 for limiting the second piston 50. For continuous lubrication, the second piston 50 is restricted from moving by the stopper 51. When the oil pump works, the external cylinder is ventilated to push the piston to close the unloading channel 40, and at the moment, the oil is conveyed along the outer end of the oil outlet channel 38; after the oil is discharged from the external metering valve, the oil pump stops working, at the moment, the external cylinder cuts off the air, the second piston 50 is pushed to move rightwards under the action of the oil pressure in the oil outlet channel 38, the unloading channel 40 is opened, and the external metering valve is reset under the action of the spring force to prepare for the next cycle.

The limiting member 51 is a plug, the limiting member 51 is screwed to the outer end of the control channel 39, that is, an external thread is provided on the plug, and an internal thread matched with the external thread is provided on the control channel 39. The structure is very convenient to disassemble and assemble, and is convenient for switching between a continuous lubrication state and a pressure relief state.

As shown in fig. 2, an overflow channel 54 is further formed on the pump base 1, the overflow channel 54 is communicated with the middle of the oil outlet channel 38, an overflow valve 55 is mounted at an outer end of the overflow channel 54, and an outlet end of the overflow valve 55 is connected to the oil tank 28. The design can adjust the flow in the oil outlet channel 38, and meanwhile, a certain protection and safety effect is achieved.

As shown in fig. 2, an oil inlet channel 56 is further formed on the pump base 1, the oil inlet channel 56 is communicated with the oil tank 28, and a joint 57 is mounted at the outer end of each of the oil inlet channel 56 and the oil outlet channel 38. The design of the oil inlet passage 56 facilitates the oil replenishment operation of the oil tank 28.

Claims (10)

1. Pneumatic grease lubricant pump, including pump seat (1), its characterized in that: the oil pump further comprises an oil tank (28), a cylinder assembly (29), a one-way valve (30) and an unloading assembly (31), wherein the oil tank (28), the cylinder assembly (29), the one-way valve (30) and the unloading assembly (31) are arranged on the pump base (1), a main channel (32) is arranged on the pump base (1), an oil suction channel (35) communicated with the oil tank (28) is formed in the inner wall of the main channel (32), a plunger sleeve (12) is arranged on the inner wall of the main channel (32), an oil suction hole (36) communicated with the oil suction channel (35) is formed in the plunger sleeve (12), the cylinder assembly (29) comprises a shell (37) arranged on the pump base (1), a first piston (5) is arranged in the shell (37) in a sliding mode, the shell (37) is internally divided into a first air cavity (8) and a second air cavity (9) by the first piston (5), a first air inlet (10) communicated with the first air cavity (8) and a second air inlet (11) communicated with the second air cavity (9) are formed in the shell (37), the first piston (5) is connected with a plunger (6) in a linkage mode, and the plunger (6) extends into the main channel (32) and is matched with the plunger sleeve in a sliding mode; an oil outlet channel (38) communicated with the main channel (32) is arranged on the pump base (1), the one-way valve (30) is matched with the plunger sleeve (12) and only allows oil in the plunger sleeve (12) to enter the oil outlet channel (38), a control channel (39) communicated with the middle of the oil outlet channel (38) and an unloading channel (40) communicated with the middle of the control channel (39) are arranged on the pump base (1), and the unloading assembly (31) is installed in the control channel (39) and used for controlling the opening and closing of the unloading channel (40).

2. The pneumatic grease lubrication pump according to claim 1, wherein: the plunger (6) comprises a first plunger section (13) and a second plunger section (14), a connecting protrusion (15) is arranged at one end, close to the second plunger section (14), of the first plunger section (13), a connecting groove (16) is arranged at one end, close to the first plunger section (13), of the second plunger section (14), the connecting protrusion (15) is inserted into the connecting groove (16) in an inserted mode, and the connecting protrusion and the connecting groove are connected together through a pin (17).

3. The pneumatic grease lubrication pump according to claim 2, wherein: a first sealing groove (21) is formed in the second plunger section (14) along the circumferential direction, and a first sealing ring (22) which is used for forming sealing fit with the inner wall of the plunger sleeve (12) is embedded in the first sealing groove (21).

4. The pneumatic grease lubrication pump according to claim 3, wherein: two second seal grooves (23) are seted up to first piston (5) periphery, inlay on second seal groove (23) and be equipped with and be used for constituting sealed complex sealing member (24) with casing (37) inner wall.

5. The pneumatic grease lubrication pump according to claim 1, wherein: the check valve (30) comprises a first screw plug (41), a check valve seat (42) and a return spring (43), the first screw plug (41) is in threaded connection with one end, far away from the cylinder assembly (29), of the main channel (32), a guide hole (44) is formed in the inner end of the first screw plug (41), a guide rod (45) matched with the guide hole (44) is arranged on the check valve seat (42), the check valve seat (42) is pressed at one end, close to the check valve (30), of the plunger sleeve (12) under the action of the return spring (43), the check valve seat (42) is in a conical shape, and a conical sealing surface (46) matched with the check valve seat (42) is arranged on the plunger sleeve (12).

6. The pneumatic grease lubrication pump according to claim 5, wherein: still include spring holder (47) and second sealing washer (48), guide arm (45) periphery is established in spring holder (47) cover, second sealing washer (48) press from both sides and establish between spring holder (47) and one-way valve seat (42), the outer end of guide hole (44) is equipped with constant head tank (49), the one end of reset spring (43) is inlayed and is established in constant head tank (49), the other end of reset spring (43) supports on spring holder (47).

7. The pneumatic grease lubrication pump according to claim 1, wherein: unloading subassembly (31) include second piston (50) and locating part (51), second piston (50) set up in control channel (39) along axial sliding, the periphery and the inner of second piston (50) are installed respectively and are used for constituting sealed complex third sealing washer (52) and fourth sealing washer (53) with control channel (39) inner wall, locating part (51) are installed and are used for spacing second piston (50) in control channel (39) outer end.

8. The pneumatic grease lubrication pump according to claim 7, wherein: the limiting piece (51) is a plug, and the limiting piece (51) is in threaded connection with the outer end of the control channel (39).

9. The pneumatic grease lubrication pump according to claim 1, wherein: an overflow channel (54) is further formed in the pump base (1), the overflow channel (54) is communicated with the middle of the oil outlet channel (38), and an overflow valve (55) is mounted at the outer end of the overflow channel (54).

10. The pneumatic grease lubrication pump according to claim 1, wherein: an oil inlet channel (56) is further formed in the pump base (1), and the oil inlet channel (56) is communicated with the oil tank (28).

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