Grease gun

Abstract

The invention relates to a grease gun which comprises a barrel, the two ends of the barrel are connected with a driving device and a plunger pump device respectively, the output end of the driving device is connected with a lead screw, the lead screw axially penetrates through the interior of the barrel to be connected with the plunger pump device at the other end of the barrel, the plunger pump device is driven by the lead screw, and a piston of the barrel is connected to the lead screw in a screwed mode. A grease cavity is formed in a space between the piston and the plunger pump device in the barrel body; an oil inlet of the plunger pump device is communicated with the grease cavity; the lead screw is rotated to drive the piston to extrude and supply grease into the plunger pump, and meanwhile, the plunger pump synchronous with the piston is used for extruding and outputting the grease, so that the pressure of the grease in the cylinder can be kept uniform and stable, the filling amount of the grease can be well controlled, and the grease leaked in the cylinder can automatically flow back into the grease cavity when the piston is reset; the whole oil gun is good in sealing performance, the surface of the oil gun cannot be dirty due to oil leakage, and the oil gun has the advantages of being reasonable in structure, easy and convenient to operate, stable and reliable.

Description

Technical Field

[0001] The invention relates to a grease filling device, in particular to a grease gun. Background Art

[0002] The grease gun is a tool for filling grease into mechanical equipment. For example, the utility model with announcement number: CN217714489U discloses a grease gun, which includes a piston cylinder. The piston of the piston cylinder squeezes the grease toward the front end of the cylinder under the action of a spring. A control handle is connected to the front end of the cylinder, and the grease in the cylinder can be pressed out from the grease filling nozzle by operating the control handle. Since the piston of the current grease gun always maintains pressure on the grease in the cylinder under the action of the spring, some of the grease will inevitably leak from between the piston and the piston cylinder wall to the other side of the piston. After using it for a period of time, a large amount of leaked grease will remain between the piston and the rear end of the piston cylinder, and this grease sticks to the spring and needs to be cleaned regularly, resulting in a poor user experience. In addition, the pressure generated by the spring is different due to the different positions of the piston, so the pressure of the grease in the cylinder cannot be kept consistent. At the same time, the existing grease gun has an intermittent output of the piston when filling grease, which makes it difficult to control the amount of grease added. Summary of the invention

[0003] The object of the present invention is to provide a grease gun, which drives a piston to squeeze and supply butter into a plunger pump by rotating a screw rod, and at the same time squeezes and outputs butter through the plunger pump synchronized with the piston, so that the butter pressure in the barrel can be kept uniform and stable, and the butter filling amount can be well controlled, and the butter leaked in the barrel can automatically flow back into the butter cavity when the piston is reset. The whole grease gun has good sealing performance, and the surface of the grease gun will not be dirty due to oil leakage. It has the characteristics of reasonable structure, simple and convenient operation, stability and reliability.

[0004] To achieve the above purpose, the following technical solutions are adopted: A grease gun comprises a cylinder, characterized in that: the two ends of the cylinder are respectively connected to a driving device and a plunger pump device, the output end of the driving device is connected to a screw, the screw axially passes through the interior of the cylinder and is connected to the plunger pump device at the other end of the cylinder, the plunger pump device is driven by the screw, a piston of the cylinder is screwed onto the screw, the space between the piston and the plunger pump device in the cylinder is a grease chamber; the oil inlet of the plunger pump device is connected to the grease chamber.

[0005] The oil chambers are connected, and an oil outlet is provided on the connecting sleeve; a pump body is provided in the connecting sleeve, and the space between the piston and the driving device in the cylinder is an oil return chamber. A through hole connecting the grease chamber and the oil return chamber is provided on the piston, and a one-way valve for the oil return chamber to flow from the grease chamber to the grease chamber is provided in the through hole.

[0006] The plunger pump device comprises a connecting sleeve body, which is connected to the end of the cylinder body and connected to the butter chamber. The pump body comprises a plunger sleeve, an inner rotating body and a swash plate. The plunger sleeve is fixedly connected to the inner wall of the connecting sleeve. An axial through hole coaxial with the cylinder body is provided inside the plunger sleeve. The outer diameter of the inner rotating body matches the inner diameter of the axial through hole and is accommodated in the axial through hole of the plunger sleeve. The two ends of the inner rotating body are respectively connected to the screw rod and the swash plate. The plunger sleeve is also provided with a plurality of plunger cavities on the periphery of the axial through hole. The plunger cavity axially penetrates the plunger A plunger sleeve is provided in each plunger cavity, the plunger cavity and the grease cavity are connected through a one-way valve, one end of the plunger is connected to the one-way valve through a spring, and the other end of the plunger abuts against the swash plate under the action of the spring; an oil outlet cavity is provided inside the inner rotating body, the oil outlet cavity is connected with the oil outlet port, a radial through hole is also provided on the inner wall of each plunger cavity, an oil cavity inlet is provided on the side wall of the oil outlet cavity at the position of the radial through hole, and the oil cavity inlet is connected and closed with part of the radial through hole 38 by rotating the inner rotating body 33.

[0007] A bearing is arranged between the swash plate and the end wall of the connecting sleeve.

[0008] The oil outlet of the plunger pump device is connected with an oil nozzle.

[0009] A connecting pipe is arranged at one end of the inner rotating body corresponding to the oil outlet, and the inclined plate is sleeved on the connecting pipe. A non-circular receiving groove is opened at one end of the inner rotating body corresponding to the screw rod, and the end of the screw rod matches the shape of the receiving groove and is inserted into the receiving groove.

[0010] The driving device is an electric driving device or a gas driving device, the electric driving device or the gas driving device is sealed and connected to the cylinder, and the output shaft of the electric driving device or the gas driving device is coaxially connected to the screw rod.

[0011] The driving device is a manual driving device, which includes a shell, a handle and a wrench. The shell and the handle are integrally structured or fixedly connected. The wrench is pivotally or hingedly connected to the shell. A transmission mechanism is arranged inside the shell. The wrench is connected to the input end of the transmission mechanism, the shell is sealed to the cylinder, and the output end of the transmission mechanism is coaxially connected to the screw rod.

[0012] The transmission mechanism includes one of a gear transmission mechanism, a lever transmission mechanism and a worm gear transmission mechanism.

[0013] The worm gear transmission mechanism includes a worm wheel and a worm that mesh with each other. The worm wheel and the worm are pivotally connected in a housing. The end of the worm passes through the housing and is provided with a gear. The middle part of the wrench is hinged on the housing or the handle, and the end of the wrench is provided with an arc-shaped rack that meshes with the gears.

[0014] The driving device of the present invention drives the plunger pump device to work synchronously while driving the piston to squeeze the butter. The piston squeezes the butter chamber and the butter is discharged by the plunger pump device at the same time, so that the butter pressure in the cylinder remains stable, and there will be no problem of butter leakage from between the piston and the inner wall of the cylinder due to the high pressure of the butter in the cylinder. The piston of the present invention can achieve precise and controllable pressure through screw rod control, which is different from the spring-driven piston with the highest pressure at the beginning and then the pressure becomes lower and lower, which is not convenient for controlling the filling amount of butter. In addition, the driving device of the present invention can adopt a manual or electric driving device or a pneumatic driving device according to actual needs, so as to achieve luxury and simplicity by people, and has the characteristics of reasonable structure, simple and convenient operation, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the plunger pump device of the present invention; Figure 3 For the present invention Figure 2 Middle AA section view; Figure 4 It is a structural schematic diagram of the worm gear transmission mechanism of the present invention. DETAILED DESCRIPTION

[0016] like Figure 1-4 As shown, a grease gun comprises a cylinder 1, two ends of the cylinder 1 are respectively connected to a driving device 2 and a plunger pump device 3, the output end of the driving device 2 is coaxially connected to a screw 4, the screw 4 axially passes through the cylinder 1 and is connected to the plunger pump device 3 at the other end of the cylinder 1, the plunger pump device 3 is driven by the screw 4, a piston 5 of the cylinder 1 is screwed on the screw 4, the space between the piston 5 and the plunger pump device 3 in the cylinder 1 is a grease chamber 11; the space between the piston 5 and the driving device 2 in the cylinder 1 is an oil return chamber 12, a through hole connecting the grease chamber 11 and the oil return chamber 12 is opened on the piston 5, the through hole is provided with a one-way valve 6 for the oil return chamber 12 to flow to the grease chamber 11, the oil inlet of the plunger pump device 3 is connected to the grease chamber 11, and the oil outlet of the plunger pump device 3 is connected to an oil nozzle 7.

[0017] The plunger pump device 3 includes a connecting sleeve 31, which is connected to the end of the cylinder 1 and communicates with the butter chamber 11, and an oil outlet is provided on the connecting sleeve 31; a pump body is provided in the connecting sleeve 31, and the pump body includes a plunger sleeve 32, an inner rotating body 33 and a swash plate 34, the plunger sleeve 32 is fixedly connected to the inner wall of the connecting sleeve 31, an axial through hole coaxial with the cylinder 1 is provided inside the plunger sleeve 32, the outer diameter of the inner rotating body 33 matches the inner diameter of the axial through hole and is accommodated in the axial through hole of the plunger sleeve 32, the two ends of the inner rotating body 33 are respectively connected to the screw rod 4 and the swash plate 34, a connecting pipe 331 is provided at one end of the inner rotating body 33 corresponding to the oil outlet, the swash plate 34 is sleeved on the connecting pipe 331, a non-circular accommodating groove 40 is provided at one end of the inner rotating body 33 corresponding to the screw rod 4, the end of the screw rod 4 matches the shape of the accommodating groove and is inserted in the accommodating groove A bearing 30 is arranged in the groove 40, between the swash plate 34 and the end wall of the connecting sleeve 31; the plunger sleeve 32 is also provided with a plurality of plunger cavities 35 on the periphery of the axial through hole, the plunger cavity 35 axially penetrates the plunger sleeve 32, and a plunger 36 is arranged in each plunger cavity 35, the oil inlet of the plunger pump device 3 is arranged at one end of the plunger cavity, the plunger cavity 35 is connected with the butter cavity 11 through a one-way valve 6, one end of the plunger 36 is connected with the one-way valve 6 through a spring, and the other end of the plunger 36 abuts against the swash plate 34 under the action of the spring; an oil outlet cavity 37 is arranged inside the inner rotating body 33, the oil outlet cavity 37 is connected with the oil outlet, and a radial through hole 38 is also arranged on the inner wall of each plunger cavity 35, and an oil cavity inlet 39 is arranged on the side wall of the oil outlet cavity 37 at the position of the radial through hole, and the oil cavity inlet 39 is connected and closed with part of the radial through hole 38 by rotating the inner rotating body 33.

[0018] The driving device 2 is a manual driving device, which includes a shell 21, a handle 22 and a wrench 23. The shell 21 and the handle 22 are integrally structured or fixedly connected. The wrench 23 is pivotally or hingedly connected to the shell 21. A transmission mechanism is arranged in the shell 21; the wrench 22 is connected to the input end of the transmission mechanism, the shell 21 is sealed and connected to the cylinder 1, and the output end of the transmission mechanism is coaxially connected to the screw 4.

[0019] The transmission mechanism is a worm gear transmission mechanism, which includes a worm wheel 24 and a worm 25 that mesh with each other. The worm wheel 24 and the worm 25 are pivotally connected in the housing 21. The end of the worm 25 passes through the housing 21 and is provided with a gear 26. The middle part of the wrench 23 is hinged to the housing 21 through a pivot 28. The end of the wrench 23 is provided with an arc-shaped rack 27 that meshes with the gear 26. A reset structure is provided between the wrench 23 and the housing 1 or the handle 22.

[0020] When the present invention is working, the wrench of the driving device 2 is controlled, and the reciprocating motion of the wrench 23 drives the worm 25 and the worm wheel 24 to rotate, and then drives the screw rod 4 to rotate. The screw rod 4 rotates to drive the piston 5 to squeeze the grease chamber 11 toward one side of the plunger pump device, and presses the grease in the chamber into the plunger pump device; when the screw rod 4 drives the piston 5 to squeeze the grease, it simultaneously drives the inner rotating body 33 and the swash plate 34 to rotate. The rotation of the swash plate 34 drives the plunger 36 in turn to open or close the one-way valve and press the grease in the plunger chamber 35 into the oil outlet chamber 37. Compared with the current piston-type grease gun, the pressure of several plungers for pressurizing and injecting oil in turn remains stable during oil injection, so the oil supply can also remain continuous and stable, which can better control the amount of grease injected.

[0021] Although the present invention can maintain a stable pressure in the grease chamber, it is inevitable that the grease will leak into the oil return chamber 12 through the gap between the piston and the cylinder wall during use. For this reason, the present invention provides a through hole connecting the grease chamber 11 and the oil return chamber 12 on the piston 5, and the through hole is provided with a one-way valve 6 for the oil return chamber 12 to flow to the grease chamber 11. When the piston 5 is reset, the grease in the oil return chamber 12 flows back to the grease chamber 11 through the one-way valve 6. There is no need to disassemble, maintain or clean the grease, and the use is more convenient.

[0022] The driving device of the present invention drives the piston to squeeze the butter and drives the plunger pump device to work synchronously. The piston squeezes the butter chamber and the butter is discharged by the plunger pump device at the same time, so that the butter pressure in the cylinder remains stable. The problem of butter leakage between the piston and the inner wall of the cylinder can be reduced because the butter in the cylinder always maintains a high pressure.

[0023] The present invention drives the piston to squeeze and supply butter into the plunger pump by rotating the screw rod, and squeezes and outputs the butter through the plunger pump synchronized with the piston, so that the butter pressure in the barrel can be kept uniform and stable, and the butter filling amount can be well controlled. When the piston is reset, the butter leaked in the barrel can automatically flow back into the butter cavity. The whole oil gun has good sealing performance and the surface of the oil gun will not be dirty due to oil leakage.

[0024] The driving device in this embodiment adopts a manual driving device, and the manual driving device can be replaced with an electric driving device or a gas driving device as needed. The electric driving device or the gas driving device only needs to be sealed and connected to the cylinder, and the output shaft of the electric driving device or the gas driving device is coaxially connected to the screw rod, so that it can be simple and luxurious. The present invention has the characteristics of reasonable structure, simple and convenient operation, stability and reliability.

Claims

1. A grease gun, comprising a barrel (1), characterized in that: The two ends of the cylinder (1) are respectively connected to a driving device (2) and a plunger pump device (3); the output end of the driving device (2) is coaxially connected to a screw (4); the screw (4) axially passes through the interior of the cylinder (1) and is connected to the plunger pump device (3) at the other end of the cylinder (1); the plunger pump device (3) is driven by the screw (4); a piston (5) of the cylinder (1) is screwed onto the screw (4); a space between the piston (5) and the plunger pump device (3) in the cylinder (1) is a grease chamber (11); and an oil inlet of the plunger pump device (3) is connected to the grease chamber (11).

2. A grease gun according to claim 1, characterized in that: The plunger pump device (3) comprises a connecting sleeve (31), the connecting sleeve (31) is connected to the end of the barrel (1) and communicates with the grease chamber (11), and an oil outlet is provided on the connecting sleeve (31); a pump body is provided inside the connecting sleeve (31), and the pump body comprises a plunger sleeve (32), an inner rotating body (33) and a swash plate (34); the plunger sleeve (32) is fixedly connected to the inner wall of the connecting sleeve (31), an axial through hole coaxial with the barrel (1) is provided inside the plunger sleeve (32), the outer diameter of the inner rotating body (33) matches the inner diameter of the axial through hole and is accommodated in the axial through hole of the plunger sleeve (32), the two ends of the inner rotating body (33) are respectively connected to the screw rod (4) and the swash plate (34), and the plunger sleeve (32) is also provided with a plurality of plunger cavities on the periphery of the axial through hole. (35), the plunger cavity (35) axially penetrates the plunger sleeve (32), each plunger cavity (35) is provided with a plunger (36), the plunger cavity (35) is communicated with the grease cavity (11) via a one-way valve (6), one end of the plunger (36) is connected to the one-way valve (6) via a spring, and the other end of the plunger (36) abuts against the swash plate (34) under the action of the spring; an oil outlet cavity (37) is provided inside the inner rotating body (33), the oil outlet cavity (37) is communicated with the oil outlet port, and a radial through hole (38) is also provided on the inner wall of each plunger cavity (35), and an oil cavity inlet (39) is provided on the side wall of the oil outlet cavity (37) at the position of the radial through hole, and the oil cavity inlet (39) is communicated with and closed by rotating the inner rotating body (33) to part of the radial through hole (38).

3. A grease gun as claimed in claim 2, characterized in that: A bearing (30) is provided between the swash plate (34) and the end wall of the connecting sleeve (31).

4. A grease gun as claimed in claim 2, characterized in that: The oil outlet of the plunger pump device (3) is connected to an oil nozzle (7).

5. A grease gun as claimed in claim 2, characterized in that: A connecting pipe (331) is provided at one end of the inner rotating body (33) corresponding to the oil outlet, the swash plate (34) is sleeved on the connecting pipe (331), a non-circular receiving groove (40) is provided at one end of the inner rotating body (33) corresponding to the screw rod (4), and the end of the screw rod (4) matches the shape of the receiving groove and is inserted into the receiving groove (40).

6. A grease gun according to claim 1, characterized in that: The driving device (2) is an electric driving device or a pneumatic driving device, the electric driving device or the pneumatic driving device is sealedly connected to the cylinder, and the output shaft of the electric driving device or the pneumatic driving device is coaxially connected to the screw.

7. A grease gun according to claim 1, characterized in that: The driving device (2) is a manual driving device, comprising a housing (21), a handle (22) and a wrench (23); the housing (21) and the handle (22) are integrally structured or fixedly connected; the wrench (23) is pivotally or hingedly connected to the housing (21); a transmission mechanism is arranged in the housing (21); the wrench (23) is connected to an input end of the transmission mechanism, the housing (21) is sealedly connected to the cylinder (1), and the output end of the transmission mechanism is coaxially connected to the screw rod (4).

8. A grease gun according to claim 7, characterized in that: The transmission mechanism includes one of a gear transmission mechanism, a lever transmission mechanism and a worm gear transmission mechanism.

9. A grease gun according to claim 8, characterized in that: The worm gear transmission mechanism comprises a worm wheel (24) and a worm (25) meshing with each other, the worm wheel (24) and the worm (25) being pivotally connected in a housing (21), the end of the worm (25) passing through the housing (21) and being provided with a gear (26), the middle part of the wrench (23) being hinged on the housing (21), the end of the wrench (23) being provided with an arc-shaped rack (27) meshing with the gear (26), and a reset structure being provided between the wrench (23) and the housing (1) or the handle (22).

10. A grease gun according to any one of claims 1 to 9, characterized in that: The space between the piston (5) and the drive device (2) in the cylinder (1) is an oil return chamber (12). A through hole connecting the grease chamber (11) and the oil return chamber (12) is provided on the piston (5). A one-way valve (6) is provided in the through hole for oil flow from the oil return chamber (12) to the grease chamber (11).

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