Grease gun oil extraction device

Abstract

The present invention belongs to the technical field of grease guns, and particularly refers to an oil extraction device of a grease gun, comprising a mounting sleeve that can be arranged in a grease gun barrel, a piston member slidably arranged in the mounting sleeve, and a fixing assembly for fixing the mounting sleeve in the grease gun barrel, the piston member comprising a piston rod arranged in the mounting sleeve and a piston arranged on the piston rod, the piston can fit with the inner wall of the grease gun barrel, a threaded rod is rotatably arranged in the mounting sleeve, a threaded hole matching the threaded rod is arranged on the piston rod, the threaded rod is penetrated in the threaded hole, a driving end is arranged at the rear end of the threaded rod, and the rotation of the driving end can be controlled to drive the piston rod and the piston to move forward and backward along the threaded rod. The present invention is an oil extraction device with a simple structure, which adopts a screw transmission structure to extract grease into the grease gun barrel, thereby achieving the effect of high efficiency and labor saving, and some users with less arm strength can also complete the oil extraction work of the grease gun barrel at one time, thereby improving work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of grease guns, in particular to an oil extraction device for a grease gun. Background Art

[0002] A grease gun is a manual tool for adding lubricating wax to equipment. It has many advantages such as simple operation, easy portability, and a wide range of uses. It is an essential tool for equipment maintenance personnel. Grease guns include manual grease guns, pneumatic grease guns, and electric grease guns. When adding grease, the grease guns on the market currently use an oil extraction device on the barrel to draw the grease into the barrel. The oil extraction device is composed of a piston, an iron chain, and a pull ring. When users extract grease, they need to first insert the front end of the barrel into the grease, and then pull the pull ring to drive the iron chain to move. Finally, the iron chain will drive the piston to move backward to draw the grease into the barrel. However, due to the backward movement of the piston, The elastic force of the spring needs to be overcome to make the spring enter a compressed state, and the front end of the gun barrel is inserted into the grease. At this time, there is a certain air pressure difference between the gun barrel and the outside world. When the user pulls the piston backward through the pull ring, the air pressure difference needs to be overcome, resulting in the user needing to expend greater effort to pull the pull ring to move, and finally complete the oil extraction work of the grease gun. Moreover, the shorter the spring is compressed, the greater the elastic force of the spring the user needs to overcome. When the piston moves further back, the user needs to expend exponentially more effort to overcome the elastic force of the spring. Some young people with less arm strength cannot even complete the oil extraction work of the grease gun barrel in one go, affecting work efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide an oil extraction device with a simple structure, which adopts a screw transmission structure to extract grease into a grease gun barrel, thereby achieving high efficiency and labor saving effects, and some users with less arm strength can also complete the oil extraction work of the grease gun barrel at one time, thereby improving work efficiency.

[0004] The object of the present invention is achieved in that:

[0005] A grease gun oil extraction device comprises a mounting sleeve which can be arranged in a grease gun barrel, a piston member which is slidably arranged in the mounting sleeve, and a fixing assembly for fixing the mounting sleeve in the grease gun barrel, the piston member comprises a piston rod which is arranged in the mounting sleeve and a piston which is arranged on the piston rod, the piston can fit with the inner wall of the grease gun barrel, a threaded rod is rotatably arranged in the mounting sleeve, a threaded hole which cooperates with the threaded rod is arranged on the piston rod, the threaded rod is inserted in the threaded hole, a driving end is arranged at the rear end of the threaded rod, and the rotation of the driving end can drive the piston rod and the piston to move forward and backward along the threaded rod through the threaded rod.

[0006] Furthermore, the piston rod includes a threaded sleeve, the threaded hole is opened on the threaded sleeve, and the threaded rod is provided with an idle portion with a smooth outer wall. The idle portion is located in front of the driving end. Driving the threaded rod to rotate can drive the threaded sleeve and the piston rod to move forward and backward along the threaded rod. When the piston rod moves backward to the maximum distance, the threaded sleeve enters the idle portion, and the threaded rod and the threaded sleeve are in a clutch state.

[0007] Furthermore, the piston rod includes a first piston rod and a second piston rod which are sleeved with each other, the threaded hole being provided on the first piston rod, the threaded rod being inserted into the threaded hole and being threadedly connected to the first piston rod, the second piston rod being slidable relative to the first piston rod, the piston being provided on the second piston rod, an oil push spring being provided between the mounting sleeve and the piston, a retraction rope being connected between the mounting sleeve and the piston, a driving platform being provided at the rear end of the first piston rod, a driving hole being provided on the driving platform for the rear end of the retraction rope to pass through, a front end of the retraction rope being connected to the piston, and the rear end of the retraction rope being connected to the front end of the mounting sleeve through the driving hole, driving the threaded rod to rotate can control the first piston rod and the driving platform to move backward along the threaded rod, the backward movement of the driving platform will drive the middle part of the retraction rope to move backward, at this time the retraction rope drives the second piston rod to move backward along the first piston rod, thereby causing the first piston rod to retract into the second piston rod.

[0008] Furthermore, a ratchet is provided on the driving end, a toggle rod is rotatably connected to the mounting sleeve, a pawl engaged with the ratchet is provided at the front end of the toggle rod, and the pawl can be engaged with the ratchet so that the threaded rod can only rotate in one direction.

[0009] Furthermore, an extension ring is provided at the rear end of the mounting sleeve, the driving end passes through the mounting sleeve and is located in the extension ring, the toggle rod and the ratchet on the driving end are both located in the extension ring, a sliding groove is provided on the extension ring, the rear end of the toggle rod passes through the sliding groove and is exposed outside the extension ring, a mounting portion is provided on the toggle rod, a mounting portion is provided on the mounting portion, a torsion spring is sleeved on the mounting column, a first tentacle and a second tentacle are respectively provided at both ends of the torsion spring, the first tentacle is located in the extension ring and abuts against the inner wall of the extension ring, a mounting hole is provided on the toggle rod, and one end of the second tentacle is located in the mounting hole.

[0010] Furthermore, the fixing assembly includes a fixing cover connected to the extension ring, a connecting cover and an abutment ring mounted on the extension ring, the abutment ring is located between the connecting cover and the fixing cover, and a notch corresponding to the sliding groove is provided on the abutment ring, the rear end of the toggle rod passes through the sliding groove and the notch to be exposed outside the extension ring, a through hole is provided on the top of the fixing cover for the driving end to pass through, the inner wall of the connecting cover is provided with a thread, and the connecting cover can be threadedly connected to the grease gun barrel through the thread of the inner wall, the extension ring is provided with an external thread, and the inner wall of the fixing cover is provided with an internal thread matching the external thread, and after the fixing cover is threadedly connected to the extension ring, the fixing cover abuts against the abutment ring.

[0011] Furthermore, a rotation-stopping protrusion is provided on the inner wall of the mounting sleeve, and a first rotation-stopping groove is provided on the outer wall of the piston rod. The rotation-stopping protrusion is located in the first rotation-stopping groove and abuts against the piston rod, thereby limiting the rotation of the piston rod relative to the mounting sleeve.

[0012] Furthermore, a connecting portion is provided on the piston, a connecting hole is opened on the connecting portion, a front end of the retraction rope is arranged in the connecting hole and fixedly connected to the connecting portion, a fixing hole is opened at the front end of the mounting sleeve, a rear end of the retraction rope passes through the driving hole, is located in the fixing hole and is fixedly connected to the front end of the mounting sleeve.

[0013] Furthermore, a second anti-rotation groove is provided on the inner wall of the first piston rod, and an anti-rotation block is provided on the outer wall of the second piston rod. The anti-rotation block is arranged in the second anti-rotation groove and is clamped with the first piston rod.

[0014] Furthermore, a driving device is provided on the driving end, and the driving device includes a control handle fixedly connected to the driving end. A polygonal rotating groove is opened on the top of the driving end, and the polygonal rotating groove can be adapted to the working head on an electric wrench or a hand drill.

[0015] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0016] The present invention belongs to the technical field of grease guns, and particularly refers to an oil extraction device for a grease gun, comprising a mounting sleeve that can be arranged in a grease gun barrel, a piston member slidably arranged in the mounting sleeve, and a fixing assembly for fixing the mounting sleeve in the grease gun barrel. The mounting sleeve can be fixedly installed in the grease gun barrel through the fixing assembly, and the piston member consists of a piston rod and a piston. The piston rod is arranged in the mounting sleeve. When the oil extraction device is installed in the grease gun barrel, the piston on the piston rod will fit with the inner wall of the grease gun barrel, so that when the piston rod moves backward in the mounting sleeve, the grease can be smoothly extracted. The threaded rod rotatably arranged in the mounting sleeve is inserted into the threaded hole of the piston rod. The user can manually rotate the driving end counterclockwise or connect an auxiliary device for assisting the rotation of the driving end to the driving end. When the driving end rotates counterclockwise, the threaded rod will rotate counterclockwise synchronously with the driving end. At this time, the piston rod threadedly connected to the threaded rod will move backward along the threaded rod, and the piston on the piston rod will also move backward along the threaded rod, thereby drawing the grease into the grease gun barrel. Compared with the grease guns currently on the market, when filling the grease, it is necessary to pull the pull ring to drive the grease gun to move backward along the threaded rod. The iron chain moves, and eventually the iron chain will drive the piston to move backward to draw the grease into the gun barrel. However, since the piston needs to overcome the elastic force of the spring and the air pressure difference in the process of moving backward to drive the piston to move backward, the user needs to spend more effort to complete the oil extraction work of the grease gun, and since the shorter the spring is compressed, the greater the elastic force of the spring that the user needs to overcome, the further back the piston moves, the user needs to spend twice the effort to overcome the elastic force of the spring, and some young people with less arm strength cannot even complete the oil extraction work of the grease gun barrel at one time, affecting work efficiency. The invention adopts the method of threading the threaded rod in the mounting sleeve to be connected with the piston rod through the threaded hole on the piston rod, and the piston rod and the piston are driven to move backward synchronously by the rotation of the threaded rod, so that the grease is smoothly drawn into the grease gun barrel. This screw transmission structure is widely used in the mechanical industry, conveying system and other industrial applications, and it can achieve high efficiency and labor-saving effects. Compared with the old oil pumping devices on the market, the invention can greatly save the effort spent by the user when pumping oil, and some users with less arm strength can also complete the oil pumping work of the grease gun barrel at one time, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of the present invention.

[0018] Figure 2 It is a cross-sectional view of the present invention.

[0019] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0020] Figure 4 It is an exploded view of the mounting sleeve and the piston member of the present invention.

[0021] Figure 5 It is an exploded view of the mounting sleeve, the fixing cover and the control handle of the present invention.

[0022] Figure 6 It is a cross-sectional view of the threaded rod of the present invention installed in the installation sleeve.

[0023] Figure 7 It is an exploded view of the abutment ring and the extension ring of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the ratchet pawl and the ratchet wheel of the present invention being engaged with each other.

[0025] Fig. 9 It is a schematic structural diagram of the present invention in which the pawl and the ratchet wheel are not engaged.

[0026] Fig.10 It is an exploded view of the first piston rod, the second piston rod and the retraction rope of the present invention.

[0027] Fig.11 It is a three-dimensional view of the first piston rod of the present invention.

[0028] Fig.12 It is a structural schematic diagram of the present invention.

[0029] Fig.13 yes Fig.12 A partial enlarged view of point D in the middle.

[0030] Fig.14 It is an exploded view of the mounting sleeve and the first piston rod and the second piston rod of the present invention.

[0031] Fig.15 It is a structural schematic diagram of the mounting sleeve and the threaded rod of the present invention.

[0032] Fig.16 It is a cross-sectional view of the mounting sleeve, the first piston rod and the threaded rod of the present invention.

[0033] Fig.17 It is a structural schematic diagram of the toggle rod and the torsion spring of the present invention.

[0034] Fig.18 It is a stereoscopic view of the threaded rod of the present invention.

[0035] The meaning of the symbols in the figure:

[0036] 1-mounting sleeve; 2-piston member; 3-piston rod; 4-piston; 7-threaded rod; 8-driving end;

[0037] 9-control handle; 10-polygonal rotation groove; 12-threaded sleeve; 13-threaded hole;

[0038] 14-idle portion; 15-first anti-rotation groove; 16-anti-rotation protrusion; 17-first piston rod;

[0039] 18-second piston rod; 19-connecting cover; 20-oil pushing spring; 21-retraction rope; 22-driving platform;

[0040] 23-driving hole; 24-connecting portion; 25-connecting hole; 26-fixing hole; 27-second anti-rotation groove;

[0041] 28- anti-rotation block; 29- extension ring; 30- fixed cover; 31- external thread; 32- internal thread;

[0042] 33-perforation; 34-ratchet; 35-sliding rod; 36-pawl; 37-sliding groove;

[0043] 38-abutment ring; 39-notch; 40-mounting portion; 41-mounting column; 42-torsion spring;

[0044] 43 - first antenna; 44 - second antenna; 45 - mounting hole. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with specific embodiments:

[0046] The present invention belongs to the technical field of grease guns, and particularly refers to an oil extraction device for a grease gun, comprising a mounting sleeve 1 which can be arranged in a grease gun barrel, a piston member 2 which is slidably arranged in the mounting sleeve 1, and a fixing assembly for fixing the mounting sleeve 1 in the grease gun barrel. The mounting sleeve 1 can be fixedly installed in the grease gun barrel by the fixing assembly, and the piston member 2 is composed of a piston rod 3 and a piston 4. The piston rod 3 is arranged in the mounting sleeve 1. When the oil extraction device is installed in the grease gun barrel, the piston 4 on the piston rod 3 will fit with the inner wall of the grease gun barrel, so that when the piston rod 3 moves backward in the mounting sleeve 1, the grease gun barrel can be smoothly extracted. The oil is drawn into the grease gun barrel, and the threaded rod 7 rotatably arranged in the mounting sleeve 1 is passed through the threaded hole 13 of the piston rod 3. The user can manually rotate the driving end 8 counterclockwise or connect an auxiliary device for assisting the driving end 8 to rotate on the driving end 8. When the driving end 8 rotates counterclockwise, the threaded rod 7 will rotate counterclockwise synchronously with the driving end 8. At this time, the piston rod 3 threadedly connected with the threaded rod 7 will move backward along the threaded rod 7, and the piston 4 on the piston rod 3 will also move backward along the threaded rod 7, thereby drawing the grease into the grease gun barrel. Compared with the grease guns currently on the market, which need to be refilled with grease, The iron chain is driven to move by pulling the pull ring, and the iron chain will eventually drive the piston 4 to move backward to draw the grease into the gun barrel. However, since the piston 4 needs to overcome the elastic force of the spring and the air pressure difference in the process of moving backward to drive the piston 4 to move backward, the user needs to spend more effort to complete the oil extraction work of the grease gun, and since the shorter the spring is compressed, the greater the elastic force of the spring that the user needs to overcome, the further back the piston 4 moves, the more effort the user needs to spend to overcome the elastic force of the spring. Some young people with weak arm strength cannot even complete the oil extraction work of the grease gun barrel in one go, which affects work efficiency. The present invention adopts a method of threading the threaded rod 7 in the mounting sleeve 1 and the piston rod 3 through the threaded hole 13 on the piston rod 3, and the piston rod 3 and the piston 4 are driven to move backward synchronously by the rotation of the threaded rod 7, so that the grease is smoothly drawn into the grease gun barrel. This screw transmission structure is widely used in the mechanical industry, conveying systems and other industrial applications, and it can achieve high efficiency and labor-saving effects. Compared with the old oil pumping devices on the market, the present invention can greatly save the user's effort when pumping oil, and some users with less arm strength can also complete the oil pumping work of the grease gun barrel at one time, thereby improving work efficiency.

[0047] Preferably, the piston rod 3 includes a threaded sleeve 12, the threaded hole 13 is provided on the threaded sleeve 12, and the threaded rod 7 is provided with an idle portion 14 whose outer wall is a smooth plane, and the idle portion 14 is located in front of the driving end 8. Driving the threaded rod 7 to rotate can drive the threaded sleeve 12 and the piston rod 3 to move forward and backward along the threaded rod 7. When the piston rod 3 moves backward to the maximum distance, the threaded sleeve 12 enters the idle portion 14, and the threaded rod 7 and the threaded sleeve 12 are in a clutch state; the threaded hole 13 is provided on the threaded sleeve 12 of the piston rod 3. When the user drives the threaded rod 7 to rotate counterclockwise through the driving end 8, the piston rod 3 and the threaded sleeve 12 will move along the threaded rod 7. When the piston rod 3 moves inward to the maximum distance, the threaded sleeve 12 on the piston rod 3 will enter the idle part 14 of the threaded rod 7. Since the outer wall of the idle part 14 is a smooth plane, even if the user continues to drive the threaded rod 7 to rotate, the threaded rod 7 and the threaded sleeve 12 are in a clutch state. When the user uses a hand drill or an electric wrench to control the rotation of the threaded rod 7, the number of revolutions of the threaded rod 7 cannot be well controlled, resulting in the piston rod 3 moving backward along the threaded rod 7 The distance exceeds the length of the mounting sleeve 1, and the mounting sleeve 1 is broken. The idle part 14 on the threaded rod 7 can well prevent the piston rod 3 from breaking the mounting sleeve 1.

[0048] Preferably, the piston rod 3 includes a first piston rod 17 and a second piston rod 18 which are sleeved with each other, the threaded hole 13 is provided on the first piston rod 17, the threaded rod 7 is passed through the threaded hole 13 and is threadedly connected to the first piston rod 17, the second piston rod 18 can slide relative to the first piston rod 17, the piston 4 is arranged on the second piston rod 18, an oil push spring 20 is provided between the mounting sleeve 1 and the piston 4, a retraction rope 21 is connected between the mounting sleeve 1 and the piston 4, a driving platform 22 is provided at the rear end of the first piston rod 17, the The driving platform 22 is provided with a driving hole 23 for the rear end of the retracting rope 21 to pass through. The front end of the retracting rope 21 is connected to the piston 4. The rear end of the retracting rope 21 passes through the driving hole 23 and is connected to the front end of the mounting sleeve 1. The threaded rod 7 is driven to rotate to control the first piston rod 17 and the driving platform 22 to move backward along the threaded rod 7. The backward movement of the driving platform 22 drives the middle part of the retracting rope 21 to move backward. At this time, the retracting rope 21 drives the second piston rod 18 to move backward along the first piston rod 17, so that the first piston rod 17 is retracted into the second piston rod 18.Since the rear end of the retracting rope 21 passes through the driving hole 23 on the driving platform 22 and is connected to the front end of the installation sleeve 1, and the driving platform 22 is arranged at the rear end of the first piston rod 17, when the user controls the threaded rod 7 to rotate, the first piston rod 17 will move backward along the threaded rod 7, so that the first piston rod 17 slowly enters the installation sleeve 1, and the driving platform 22 on the first piston rod 17 will also move backward along the threaded rod 7. The backward movement of the driving platform 22 will drive the middle part of the retracting rope 21 to move backward, so that the retracting rope 21 drives the second piston rod 18 to slowly enter the first piston rod 17, so that the first piston rod 17 and the second piston rod 18 can be moved backward. The plug rod 18 moves backward synchronously. When the driving platform 22 reaches the bottom end in the installation sleeve 1, the first piston rod 17 shrinks into the installation sleeve 1, and the shrink rope 21 in the installation sleeve 1 is in a "V" shape. After the first piston rod 17 moves backward, it can smoothly drive the second piston rod 18 to move backward through the shrink rope 21, and the second piston rod 18 can be retracted into the first piston rod 17, so that the oil pumping device can pump more grease into the grease gun barrel, ensuring that there is enough grease in the grease gun barrel to complete the work, thereby reducing subsequent oil pumping work and increasing work efficiency. Since an oil push spring 20 is provided between the installation sleeve 1 and the piston 4, previously During the oil pumping process, the second piston rod 18 and the piston 4 on the second piston rod 18 will move backward along the first piston rod 17. When the oil pumping work is completed, the oil pushing spring 20 is in a compressed state. The compressed oil pushing spring 20 will push the piston 4 and the second piston rod 18 to move outward relative to the first piston rod 17. The piston 4 will drive the contraction rope 21 to move outward synchronously. After the contraction rope 21 moves, it will drive the first piston rod 17 to move forward along the threaded rod 7 through the driving platform 22. At this time, during the forward movement of the first piston rod 17, the threaded rod 7 will rotate in place, and finally the second piston rod 18 and the first piston rod 17 will The grease in the grease gun barrel will be squeezed into the working head of the grease gun under the thrust of the oil pushing spring 20, and then the grease gun will be controlled to pump out the grease. The length of the retracting rope 21 is shorter than the sum of the lengths of the first piston rod 17 and the second piston rod 18. When all the grease in the grease gun barrel is used up, the first piston rod 17 can be effectively restricted from being separated from the mounting sleeve 1 and the second piston rod 18 from being separated from the first piston rod 17, ensuring that the oil pumping device can normally extract grease later, and the normal operation of the oil pumping device will not be affected by the first piston rod 17 being separated from the mounting sleeve 1 or the second piston rod 18 being separated from the first piston rod 17.

[0049] Preferably, a ratchet 34 is provided on the driving end 8, and a toggle rod 35 is rotatably connected to the mounting sleeve 1. A pawl 36 engaged with the ratchet 34 is provided at the front end of the toggle rod 35, and the pawl 36 can be engaged with the ratchet 34 so that the threaded rod 7 can only rotate in one direction; the pawl 36 at the front end of the toggle rod 35 is engaged with the ratchet 34 on the driving end 8, and the ratchet 34 mechanism is formed by the toggle rod 35, the pawl 36 and the ratchet 34. It is a unidirectional intermittent motion mechanism that can be used for unidirectional drive to prevent reversal. It is commonly used in the rotation of various machine tools or rotary workbenches. When the user controls the driving end 8 to rotate counterclockwise to pump oil, the threaded rod 7 can also rotate counterclockwise normally, so that the grease can be normally pumped into the grease gun barrel. However, when the user stops controlling the rotation of the driving end 8, the compressed oil pushing spring 20 will push the piston 4 and the second piston rod 18 to move forward. After the piston 4 moves forward, it will drive the retraction rope 21 to move forward. After the retraction rope 21 moves forward, it will drive the first piston rod 17 to move forward through the driving platform 22. The first piston rod 17 moves forward and drives the threaded rod 7 to rotate clockwise. After the threaded rod 7 rotates clockwise, it will drive the driving end 8 at the bottom of the threaded rod 7 and the ratchet 34 on the driving end 8 to rotate clockwise. At this time, under the thrust of the oil pushing spring 20, the piston 4 can normally push the grease in the grease gun barrel to move outward. However, when the user completes the oil extraction work, the user needs to install the grease gun barrel to the grease gun head first. The process takes a certain amount of time, but due to the thrust of the oil pushing spring 20, the oil pushing spring 20 will eventually drive the piston 4 to move outward, thereby directly pushing the grease in the grease gun barrel out of the grease gun barrel, causing grease waste and affecting the installation of the grease gun barrel on the grease gun head. The present invention provides a ratchet 34 mechanism. When the user completes the oil pumping work, the pawl 36 on the toggle rod 35 is engaged with the ratchet 34, thereby restricting the ratchet 34 from rotating clockwise and restricting the threaded rod 7 from rotating clockwise. The threaded rod 7 cannot rotate smoothly, so that the first piston rod 17 and the driving platform 22 on the first piston rod 17 cannot move forward. Finally, the retraction rope 21, the piston rod 3 and the piston 4 cannot move forward, so that the oil pushing spring 20 The grease in the grease gun barrel cannot be pushed forward by the piston 4, which can avoid the situation in which the grease in the grease gun barrel is directly pushed out of the grease gun barrel by the piston 4 when the user is installing the grease gun barrel on the grease gun head, which can avoid the waste of grease and enable the user to smoothly install the grease gun barrel on the grease gun head. When the grease gun barrel is full of grease, the threaded sleeve 12 on the first piston rod 17 will enter the idle part 14, and the threaded rod 7, the driving end 8 and the ratchet 34 can rotate counterclockwise relative to the pawl 36. The user can disengage the pawl 36 at the front end of the toggle rod 35 from the ratchet 34 by toggling the rear end of the toggle rod 35 counterclockwise, and the ratchet 34, the driving end 8 and the threaded rod 7 can rotate clockwise.The driving end 8 and the ratchet 34 can rotate counterclockwise relative to the pawl 36, so that the push spring can smoothly push the grease into the working head of the grease gun through the piston 4, so that the grease gun can be used normally. When the grease in the grease gun barrel is only half filled, at this time, although the threaded sleeve 12 in the first piston rod 17 has not entered the idle part 14, the threaded rod 7, the driving end 8 and the ratchet 34 can still rotate counterclockwise relative to the pawl 36. The user only needs to slightly forcefully turn the toggle rod 35 counterclockwise, and the ratchet 34, the driving end 8 and the threaded rod 7 can rotate clockwise, and finally the grease gun can be used normally.

[0050] Preferably, an extension ring 29 is provided at the rear end of the mounting sleeve 1, the driving end 8 passes through the mounting sleeve 1 and is located in the extension ring 29, the toggle rod 35 and the ratchet 34 on the driving end 8 are both located in the extension ring 29, a sliding groove 37 is provided on the extension ring 29, the rear end of the toggle rod 35 passes through the sliding groove 37 and is exposed outside the extension ring 29, a mounting portion 40 is provided on the toggle rod 35, a mounting column 41 is provided on the mounting portion 40, a torsion spring 42 is sleeved on the mounting column 41, and a first feeler 43 and a second feeler 44 are respectively provided at both ends of the torsion spring 42, the first feeler 43 is located in the extension ring 29 and abuts against the inner wall of the extension ring 29, a mounting hole 45 is provided on the toggle rod 35, and one end of the second feeler 44 is located in the mounting hole 45; since the mounting portion 40 of the toggle rod 35 has a mounting column 41, and a torsion spring 42 is sleeved on the mounting column 41, a first feeler 43 on the torsion spring 42 abuts against the inner wall of the extension ring 29, and one end of the second feeler 44 on the torsion spring 42 is located in the mounting hole 45 of the toggle rod 35. When the driving end 8 rotates counterclockwise, the ratchet 34 will be driven to rotate counterclockwise relative to the pawl 36. At this time, the ratchet 34 will drive the pawl 36 to slide on the ratchet 34. During the sliding process of the pawl 36, the toggle rod 35 will be driven to swing counterclockwise, so that the second feeler 44 on the torsion spring 42 is deformed, so that the pawl 36 can always abut against the ratchet 34. At this time, the ratchet 34 can rotate counterclockwise normally, so that the threaded rod 7 can also rotate counterclockwise normally, and the driving end 8 passes through the mounting sleeve 1 and is located in the extension ring 29, and the driving end 8 is not inside the mounting sleeve 1, so that it is convenient for the user to control the rotation of the driving end 8.

[0051] Preferably, the fixing assembly includes a fixing cover 30 connected to the extension ring 29, a connecting cover 19 and an abutting ring 38 sleeved on the extension ring 29, the abutting ring 38 is located between the connecting cover 19 and the fixing cover 30, and a notch 39 corresponding to the sliding groove 37 is provided on the abutting ring 38, the rear end of the toggle rod 35 passes through the sliding groove 37 and the notch 39 and is exposed outside the extension ring 29, a through hole 33 is provided on the top of the fixing cover 30 for the driving end 8 to pass through, the inner wall of the connecting cover 19 is provided with a thread, and the connecting cover 19 can be threadedly connected to the grease gun barrel through the thread of the inner wall, and the extension ring 29 is provided with a The fixing cover 30 has an external thread 31, and the inner wall of the fixing cover 30 is provided with an internal thread 32 matching the external thread 31. After the fixing cover 30 is threadedly connected to the extension ring 29, the fixing cover 30 is abutted against the abutment ring 38; the through hole 33 at the top of the fixing cover 30 allows the driving end 8 to be smoothly exposed outside the installation sleeve 1, so that it is convenient for the user to control the rotation of the threaded rod 7 through the driving end 8. Before the user fixes the installation sleeve 1 to the grease gun barrel, the user needs to first sleeve the connecting cover 19 and the abutment ring 38 onto the extension ring 29 at the rear end of the installation sleeve 1 in sequence. Since the extension ring 29 has an external thread 31, the inner wall of the fixing cover 30 has an internal thread 32 matching the external thread 31. The inner thread 32, at this time, the user can connect the fixing cover 30 to the extension ring 29 by rotating the fixing cover 30, at this time, the fixing cover 30 will abut against the upper end surface of the extension ring 29, and the lower end surface of the extension ring 29 will abut against the connecting cover 19, under the pressure of the fixing cover 30, the connecting cover 19 and the extension ring 29 will be locked on the extension ring 29, and the notch 39 on the abutting ring 38 corresponds to the position of the sliding groove 37 on the extension ring 29, so as to avoid the situation that the sliding groove 37 on the extension ring 29 is blocked after the fixing cover 30 is connected to the extension ring 29, so that the rear end of the toggle rod 35 connected to the top of the installation sleeve 1 can be smoothly moved. The oil pumping device is conveniently passed through the sliding groove 37 and the notch 39 to be exposed outside the extension ring 29, so that the user can control the toggle rod 35 to rotate, and the connecting cover 19 is a rear cover of the rear end of the grease gun barrel commonly seen on the market, and its inner wall has a thread, and the rear end of the grease gun barrel on the market has a thread. The user can place the installation sleeve 1 into the grease gun barrel, and then rotate the connecting cover 19 to make the connecting cover 19 threadedly connected to the grease gun barrel, so that the oil pumping device is fixed to the grease gun barrel. This structure of fixing the oil pumping device to the grease gun barrel is simple, time-saving and labor-saving, and the installation steps are relatively convenient, so that users who purchase the oil pumping device separately can install it by themselves.

[0052] Preferably, a stop protrusion 16 is provided on the inner wall of the mounting sleeve 1, and a first stop groove 15 is provided on the outer wall of the piston rod 3, the stop protrusion 16 is located in the first stop groove 15 and abuts against the piston rod 3, thereby limiting the rotation of the piston rod 3 relative to the mounting sleeve 1; the number of the first stop grooves 15 is four, and the four first stop grooves 15 are respectively arranged on the outer wall of the piston rod 3, and the number of the stop protrusions 16 on the inner wall of the mounting sleeve 1 is also four, the stop protrusion 16 is located in the first stop groove 15 and abuts against the piston rod 3, the number of the stop protrusions 16 and the first stop groove 15 are both four, which can ensure that the piston rod 3 cannot rotate at all relative to the mounting sleeve 1, so that after the threaded rod 7 is rotated, the piston rod 3 can be normally controlled to move backward in the mounting sleeve 1, so that the oil pumping device can complete the oil pumping work normally.

[0053] Preferably, a connecting portion 24 is provided on the piston 4, a connecting hole 25 is opened on the connecting portion 24, the front end of the retraction rope 21 is arranged in the connecting hole 25 and is fixedly connected to the connecting portion 24, a fixing hole 26 is opened at the front end of the mounting sleeve 1, the rear end of the retraction rope 21 passes through the driving hole 23 and is located in the fixing hole 26 and is fixedly connected to the front end of the mounting sleeve 1; the front end of the retraction rope 21 is fixedly connected to the piston 4 through the connecting hole 25 on the connecting portion 24, and the rear end of the retraction rope 21 is fixedly connected to the mounting sleeve 1 through the fixing hole 26 at the front end of the mounting sleeve 1, so that the retraction rope 21 can be smoothly connected to the piston 4 and the mounting sleeve 1, and the number of the connecting portion 24 on the piston 4, the driving platform 22 at the bottom end of the first piston rod 17, the retraction rope 21 and the fixing hole 26 at the top of the mounting sleeve 1 are all two, so that in the process of the oil pushing spring 20 pushing the piston 4 to move outward along the grease gun barrel, the piston 4 can be subjected to uniform force, thereby avoiding the piston 4 from being offset during the oil pushing process.

[0054] Preferably, a second anti-rotation groove 27 is provided on the inner wall of the first piston rod 17, and a anti-rotation block 28 is provided on the outer wall of the second piston rod 18, and the anti-rotation block 28 is arranged in the second anti-rotation groove 27 and is engaged with the first piston rod 17; the setting of the anti-rotation block 28 and the second anti-rotation groove 27 can limit the rotation of the second piston rod 18 relative to the first piston rod 17, so that when the oil push spring 20 pushes the piston 4 to drive the second piston rod 18 to move outward, the second piston rod 18 can only move in a straight line at this time, avoiding the second piston rod 18 from rotating during the outward movement, thereby reducing the friction generated between the second piston rod 18 and the first piston rod 17, and avoiding the second piston rod 18 and the first piston rod 17 from causing serious wear and damage after the pumping device is used for a long time.

[0055] Preferably, a driving device is provided on the driving end 8, and the driving device includes a control handle 9 fixedly connected to the driving end 8, and a polygonal rotation groove 10 is provided on the top of the driving end 8, and the polygonal rotation groove 10 can be adapted to the working head on the electric wrench or the hand drill; the user can drive the driving end 8 to rotate by rotating the control handle 9, and the setting of the control handle 9 is convenient for the user to control the rotation of the driving end 8, and the top of the driving end 8 is provided with a polygonal rotation groove 10, and the polygonal rotation groove 10 can be a quadrilateral or a hexagonal shape. Electric wrenches and hand drills are a common type of electric tools on the market. A working head that matches the polygonal rotating groove 10 can be installed on the electric wrench or the hand drill. After the working head is inserted into the polygonal rotating groove 10, the user presses the switch on the electric wrench or the hand drill to make the working head drive the driving end 8 to rotate synchronously. At this time, the threaded rod 7 will rotate, so that the user does not even need to manually rotate the driving end 8 to drive the threaded rod 7 to rotate. This rotation method of the threaded rod 7 is more labor-saving, and the rotation speed of the threaded rod 7 is faster, which makes the speed of the piston member 2 moving backward faster, so that the oil extraction work of the grease gun barrel can be completed more quickly, thereby improving work efficiency.

[0056] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grease gun oil extraction device, comprising a mounting sleeve (1) which can be arranged in a grease gun barrel, a piston member (2) which is slidably arranged in the mounting sleeve (1), and a fixing assembly for fixing the mounting sleeve (1) in the grease gun barrel, characterized in that: The piston member (2) comprises a piston rod (3) arranged in a mounting sleeve (1) and a piston (4) arranged on the piston rod (3); the piston (4) can fit with the inner wall of the grease gun barrel; a threaded rod (7) is rotatably arranged in the mounting sleeve (1); a threaded hole (13) cooperating with the threaded rod (7) is arranged on the piston rod (3); the threaded rod (7) is inserted into the threaded hole (13); a driving end (8) is arranged at the rear end of the threaded rod (7); and the driving end (8) can be controlled to rotate so as to drive the piston rod (3) and the piston (4) to move forward and backward along the threaded rod (7) through the threaded rod (7).

2. The oil extraction device of a grease gun according to claim 1, characterized in that: The piston rod (3) comprises a threaded sleeve (12), the threaded hole (13) is formed on the threaded sleeve (12), and the threaded rod (7) is provided with an idle portion (14) whose outer wall is a smooth plane. The idle portion (14) is located in front of the driving end (8). The threaded rod (7) is driven to rotate, which can drive the threaded sleeve (12) and the piston rod (3) to move forward and backward along the threaded rod (7). When the piston rod (3) moves backward to a maximum distance, the threaded sleeve (12) enters the idle portion (14), and at this time, the threaded rod (7) and the threaded sleeve (12) are in a clutch state.

3. The oil extraction device of a grease gun according to claim 1, characterized in that: The piston rod (3) comprises a first piston rod (17) and a second piston rod (18) which are sleeved with each other. The threaded hole (13) is provided on the first piston rod (17). The threaded rod (7) is inserted into the threaded hole (13) and is threadedly connected to the first piston rod (17). The second piston rod (18) can slide relative to the first piston rod (17). The piston (4) is arranged on the second piston rod (18). An oil push spring (20) is provided between the mounting sleeve (1) and the piston (4). A retraction rope (21) is connected between the mounting sleeve (1) and the piston (4). A driving platform (22) is provided at the rear end of the first piston rod (17). The movable platform (22) is provided with a driving hole (23) for the rear end of the retracting rope (21) to pass through. The front end of the retracting rope (21) is connected to the piston (4). The rear end of the retracting rope (21) passes through the driving hole (23) and is connected to the front end of the mounting sleeve (1). The threaded rod (7) is driven to rotate to control the first piston rod (17) and the driving platform (22) to move backward along the threaded rod (7). The backward movement of the driving platform (22) drives the middle part of the retracting rope (21) to move backward. At this time, the retracting rope (21) drives the second piston rod (18) to move backward along the first piston rod (17), so that the first piston rod (17) is retracted into the second piston rod (18).

4. The oil extraction device of a grease gun according to any one of claims 1 to 3, characterized in that: The driving end (8) is provided with a ratchet (34), the mounting sleeve (1) is rotatably connected with a toggle rod (35), the front end of the toggle rod (35) is provided with a pawl (36) engaged with the ratchet (34), and the pawl (36) can be engaged with the ratchet (34) so ​​that the threaded rod (7) can only rotate in one direction.

5. The oil extraction device of a grease gun according to claim 4, characterized in that: The rear end of the mounting sleeve (1) is provided with an extension ring (29), the driving end (8) passes through the mounting sleeve (1) and is located in the extension ring (29), the toggle rod (35) and the ratchet wheel (34) on the driving end (8) are both located in the extension ring (29), the extension ring (29) is provided with a sliding groove (37), the rear end of the toggle rod (35) passes through the sliding groove (37) and is exposed outside the extension ring (29), and the toggle rod (35) is provided with a mounting portion ( 40), the mounting portion (40) is provided with a mounting column (41), the mounting column (41) is sleeved with a torsion spring (42), the two ends of the torsion spring (42) are respectively provided with a first feeler (43) and a second feeler (44), the first feeler (43) is located in the extension ring (29) and abuts against the inner wall of the extension ring (29), the toggle rod (35) is provided with a mounting hole (45), and one end of the second feeler (44) is located in the mounting hole (45).

6. The oil extraction device of a grease gun according to claim 5, characterized in that: The fixing assembly comprises a fixing cover (30) connected to the extension ring (29), a connecting cover (19) sleeved on the extension ring (29), and an abutting ring (38), wherein the abutting ring (38) is located between the connecting cover (19) and the fixing cover (30), and a notch (39) corresponding to the sliding groove (37) is formed on the abutting ring (38), and the rear end of the toggle rod (35) passes through the sliding groove (37) and the notch (39) to be exposed outside the extension ring (29), and the fixing cover (30) is connected to the fixing cover (19). The top of the connecting cover (19) is provided with a through hole (33) for the driving end (8) to pass through, the inner wall of the connecting cover (19) is provided with a thread, and the connecting cover (19) can be threadedly connected to the grease gun barrel through the thread of the inner wall, the extension ring (29) is provided with an external thread (31), and the inner wall of the fixing cover (30) is provided with an internal thread (32) matching the external thread (31), and after the fixing cover (30) is threadedly connected to the extension ring (29), the fixing cover (30) is in contact with the abutment ring (38).

7. The oil extraction device of a grease gun according to claim 1, characterized in that: A rotation-stopping protrusion (16) is provided on the inner wall of the mounting sleeve (1), and a first rotation-stopping groove (15) is provided on the outer wall of the piston rod (3). The rotation-stopping protrusion (16) is located in the first rotation-stopping groove (15) and abuts against the piston rod (3), thereby limiting the rotation of the piston rod (3) relative to the mounting sleeve (1).

8. The oil extraction device of a grease gun according to claim 3, characterized in that: The piston (4) is provided with a connecting portion (24), the connecting portion (24) is provided with a connecting hole (25), the front end of the retractable rope (21) is arranged in the connecting hole (25) and is fixedly connected to the connecting portion (24), the front end of the installation sleeve (1) is provided with a fixing hole (26), the rear end of the retractable rope (21) passes through the driving hole (23), is located in the fixing hole (26), and is fixedly connected to the front end of the installation sleeve (1).

9. The oil extraction device of a grease gun according to claim 3, characterized in that: The inner wall of the first piston rod (17) is provided with a second anti-rotation groove (27), and the outer wall of the second piston rod (18) is provided with a anti-rotation block (28). The anti-rotation block (28) is arranged in the second anti-rotation groove (27) and is clamped with the first piston rod (17).

10. The oil extraction device of a grease gun according to any one of claims 1 to 3, characterized in that: The driving end (8) is provided with a driving device, the driving device comprising a control handle (9) fixedly connected to the driving end (8), a polygonal rotating groove (10) is provided on the top of the driving end (8), and the polygonal rotating groove (10) can be adapted to a working head on an electric wrench or a hand drill.

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