Electric lubricating grease gun

Abstract

The utility model discloses an electric lubricating grease gun which comprises an oil barrel, a shell, a first valve body, a second valve body and a driving part, an oil cavity, a first flow channel, a second flow channel and a third flow channel are arranged in the shell, an oil outlet hole is formed in the shell, and the third flow channel is communicated with the oil outlet hole; when the first plunger moves in the first direction, the first valve body controls the first flow channel to be communicated with the third flow channel, and the second valve body controls the first flow channel to be disconnected from the third flow channel; when the second plunger moves in the first direction, the first valve body controls the first flow channel and the third flow channel to be disconnected, and the second valve body controls the first flow channel and the third flow channel to be communicated. When the plunger moves in the preset direction, the first valve body and the second valve body act synergistically, the fluid path is accurately controlled, it is ensured that lubricating grease flows in the correct direction, and pressure fluctuation caused by backflow is avoided. According to the electric lubricating grease gun, through fine flow adjustment and multi-channel design, the efficient and stable lubricating effect can be achieved in different use scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lubricating grease gun, especially to an electric lubricating grease gun. BACKGROUND

[0002] The electric lubricating grease gun is widely applied in the maintenance of mechanical equipment, and is used for delivering lubricating grease to various machine parts to ensure the stable operation of the equipment. The electric lubricating grease gun currently used on the market drives the reciprocating motion of the plunger through the motor, which can realize the delivery of the lubricating grease, but is prone to the problems of lubricating grease backflow and leakage, resulting in unstable lubrication effect and even affecting the normal use of the equipment. Especially in the application scene requiring high flow and high efficiency lubrication, the performance of the prior art cannot meet the actual demand, and the flow control in the lubricating grease flow process cannot be effectively optimized, so that the overall working efficiency is restricted. SUMMARY

[0003] To solve the problem of lubricating grease backflow of the electric lubricating grease gun in the prior art, the purpose of the utility model is to provide an electric lubricating grease gun capable of avoiding backflow, improving flow and realizing stable oil discharge.

[0004] To achieve the above-mentioned utility model purpose, one embodiment of the utility model provides an electric lubricating grease gun, which comprises: an oil drum for storing lubricating grease;

[0005] a shell body sealingly connected with the oil drum, wherein an oil cavity, a first flow channel, a second flow channel and a third flow channel are arranged in the shell body, an oil outlet hole is arranged on the shell body, and the third flow channel is communicated with the oil outlet hole;

[0006] a first valve body and a second valve body, wherein the first valve body controls the communication or interruption of the first flow channel and the third flow channel, and the second valve body controls the communication or interruption of the second flow channel and the third flow channel;

[0007] a driving part arranged in the shell body, wherein the driving part comprises a first plunger and a second plunger, the first plunger is arranged in the first flow channel, the second plunger is arranged in the second flow channel, and the movement directions of the first plunger and the second plunger are opposite;

[0008] When the first plunger moves in the first direction, the first valve body controls the communication of the first flow channel and the third flow channel, and the second valve body controls the interruption of the first flow channel and the third flow channel;

[0009] When the second plunger moves in the first direction, the first valve body controls the interruption of the first flow channel and the third flow channel, and the second valve body controls the communication of the first flow channel and the third flow channel.

[0010] As a further improvement of the utility model, the first valve body comprises a first valve cap and a first elastic part, and the second valve body comprises a second valve cap and a second elastic part.

[0011] When the first plunger moves in the first direction, the first valve cap presses the first elastic part to move in the first direction; when the first plunger moves in a second direction opposite to the first direction, the first elastic part drives the first valve cap to move in the second direction until the end of stroke.

[0012] When the second plunger moves in the first direction, the second valve cap presses the second elastic part to move in the first direction; when the second plunger moves in the second direction, the second elastic part drives the second valve cap to move in the second direction until the end of stroke.

[0013] As a further improvement of the utility model, the second valve cap comprises a through hole, and when the second valve body controls the first flow channel and the third flow channel to be cut off, the fluid in the first flow channel passes through the third flow channel and the through hole to enter the oil outlet hole.

[0014] As a further improvement of the utility model, the first valve body and the second valve body are detachably connected to the shell, the first valve cap reciprocates in the first flow channel in the first direction, and the second valve cap reciprocates in the second flow channel in the first direction.

[0015] As a further improvement of the utility model, the shell comprises a protrusion, the protrusion is arranged at the middle position of the oil cavity, and the first flow channel, the second flow channel and the third flow channel are arranged in the protrusion.

[0016] When the first plunger moves in the second direction to move out of the first flow channel, the first flow channel is communicated with the oil cavity.

[0017] When the second plunger moves in the second direction to move out of the second flow channel, the second flow channel is communicated with the oil cavity.

[0018] As a further improvement of the utility model, the driving part further comprises a crankshaft, a first crank, a second crank, a first universal joint and a second universal joint, the crankshaft comprises a power input end for connecting a power device, the crankshaft is rotationally connected with the first crank and the second crank, the first crank is connected with the first plunger through the first universal joint, the second crank is connected with the second plunger through the second universal joint, and the crankshaft drives the first plunger and the second plunger to reciprocate.

[0019] As a further improvement of the present application, the shell comprises a first cavity and a second cavity, the electric grease gun further comprises a shell cover, the shell cover closes the first cavity and the second cavity, the first crank, the first universal joint and part of the first plunger are contained in the first cavity, the second crank, the second universal joint and part of the second plunger are contained in the second cavity, the shell cover and the shell enclose a plurality of annular grooves, the bearing sleeved on the crankshaft is contained in the annular groove.

[0020] As a further improvement of the present application, the oil bucket comprises a handle and an elastic member, when the handle is released, the elastic member drives the grease into the oil cavity.

[0021] As a further improvement of the present application, the shell further comprises an exhaust hole and an exhaust valve, the exhaust hole communicates the oil cavity with the outside, and the exhaust valve controls the opening and closing of the exhaust hole.

[0022] As a further improvement of the present application, the exhaust hole is arranged on the side of the shell away from the oil bucket, and the opening direction of the exhaust hole is arranged upward.

[0023] Compared with the common technology, the electric grease gun has the following beneficial effects: through the innovative design of the driving part and the flow channel, the working efficiency of the electric grease gun is significantly improved. When the plunger moves in the predetermined direction, the first valve body and the second valve body cooperate to accurately control the fluid path, ensuring that the grease flows in the correct direction and avoiding pressure fluctuations caused by backflow. Through fine flow regulation and multi-channel design, the electric grease gun can achieve efficient and stable lubrication effect in different use scenarios, has strong market competitiveness and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure schematic view of the electric grease gun of an embodiment of the present application;

[0025] Figure 2 is an exploded view of the electric grease gun of an embodiment of the present application;

[0026] Figure 3 is a sectional view of the electric grease gun of an embodiment of the present application in one movement state;

[0027] Figure 4 is a sectional view of the electric grease gun of an embodiment of the present application in another movement state;

[0028] Figure 5 is a side view of the shell of an embodiment of the present application;

[0029] Figure 6 isFigure 5 A-A direction cross-sectional view;

[0030] Figure 7 is the structure diagram of the driving part of an embodiment of the utility model;

[0031] Figure 8 is the explosion view of the first valve body and the second valve body of an embodiment of the utility model;

[0032] Wherein, 100, electric grease gun;10, oil drum;11, handle;20, shell;201, oil cavity;21, first flow channel;22, second flow channel;23, third flow channel;24, protrusion;25, first cavity;26, second cavity;27, oil outlet hole;28, exhaust hole;281, exhaust valve;30, first valve body;31, first valve cap;32, first elastic part;40, second valve body;41, second valve cap;411, through hole;42, second elastic part;50, driving part;51, first plunger;52, second plunger;53, crankshaft;531, power input end;532, bearing;54, first crank;55, first universal joint;56, second crank;57, second universal joint;60, shell cover;S1, first direction;S2, second direction. DETAILED DESCRIPTION

[0033] The utility model will be described in detail below in combination with the specific implementation of the drawings shown. But these implementation does not limit the utility model, the conversion of structure, method or function that the ordinary skill in the art makes according to these implementation is included in the protection scope of the utility model.

[0034] It should be understood that the terms such as "upper", "above", "lower", "below" used herein to indicate the spatial relative position are for the purpose of convenient description to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The spatial relative position terms can be intended to include different orientations of the device in use or work other than the orientation shown in the drawings.

[0035] An embodiment of the utility model provides a kind of electric grease gun that avoids backflow and improves flow, realizes stable oil outlet.

[0036] The grease output by electric grease gun can be calcium-based grease, such as "butter", and can also be sodium-based grease, lithium-based grease, aluminum-based grease, composite lithium-based grease, composite barium-based grease, silica grease, polyurea grease, etc., as well as gray grease, brown grease, white grease, black grease, etc.

[0037] The electric grease gun 100 of the embodiment is as follows Figure 1 And 2As shown, the device includes an oil bucket 10, a housing 20, a first valve body 30, a second valve body 40, and a driving part 50, etc. The oil bucket 10 is used for storing lubricating grease, the housing 20 is sealingly connected with the oil bucket 10 to ensure that the lubricating grease will not leak during the working process, the housing 20 is provided with an oil cavity 201, a first flow channel 21, a second flow channel 22, and a third flow channel 23, and the housing 20 is provided with an oil outlet hole 27, the third flow channel 23 is communicated with the oil outlet hole 27, so as to output the lubricating grease to the target component. The first flow channel 21, the second flow channel 22, the third flow channel 23, and the oil outlet hole 27 are as shown. Figure 6

[0038] As shown in Figure 3 and 4 , the first valve body 30 and the second valve body 40 are used for controlling the communication and interruption of the flow channels. The first valve body 30 controls the communication or interruption of the first flow channel 21 and the third flow channel 23, and the second valve body 40 controls the communication or interruption of the second flow channel 22 and the third flow channel 23; the driving part 50 is arranged in the housing 20, and the driving part 50 includes a first plunger 51 and a second plunger 52, the first plunger 51 is arranged in the first flow channel 21, and the second plunger 52 is arranged in the second flow channel 22, the moving directions of the first plunger 51 and the second plunger 52 are opposite, so as to realize the alternating output of the lubricating grease.

[0039] During the working process, when the first plunger 51 moves in a first direction S1, at this time, the second plunger 52 moves in a direction opposite to the first direction S1, the first valve body 30 controls the communication of the first flow channel 21 and the third flow channel 23, and the second valve body 40 controls the interruption of the second flow channel 22 and the third flow channel 23. At this time, the lubricating grease enters the third flow channel 23 through the first flow channel 21 and is output from the oil outlet hole 27. Conversely, when the second plunger 52 moves in the first direction S1, at this time, the first plunger 51 moves in a direction opposite to the first direction S1, the first valve body 30 controls the interruption of the first flow channel 21 and the third flow channel 23, and the second valve body 40 controls the communication of the second flow channel 22 and the third flow channel 23, so that the lubricating grease enters the third flow channel 23 through the second flow channel 22 and is output.

[0040] In order to clearly express the positions and directions described in the embodiment, in the embodiment, the first direction S1 is defined as moving downward, and the second direction S2 opposite to the first direction S1 is defined as moving upward in the following, so that the upward and downward directions are upward and downward in Figure 3 and Figure 4 , the left side in Figure 3 and 4 is the left side of the embodiment, and the right side is the right side of the embodiment, so that the oil outlet direction of the oil outlet hole 27 is the right oil outlet direction, and the oil bucket 10 is installed from left to right with the housing 20.

[0041] ​The embodiment adopts a double-plunger structure and enables more continuous and stable output of the lubricating grease through opposite direction movements, avoiding uneven flow problems that may be caused by single-plunger designs. Through precise control of the valve body, backflow and leakage of the lubricating grease can be effectively prevented, ensuring stable output of the lubricating grease in a high-pressure environment. In addition, the reasonable layout of the oil cavity 201 in the shell 20 and the flow channels enables the entire lubricating system to have high sealing performance and reliability, thereby efficiently and stably operating and having good adaptability and practicality, and being suitable for various industrial lubricating application scenarios.

[0042] Further, as shown in Figure 3 , 4 , the first valve body 30 includes a first valve cap 31 and a first elastic part 32, and the second valve body 40 includes a second valve cap 41 and a second elastic part 42; the first valve cap 31 and the first elastic part 32 are cooperatively installed in the first flow channel 21, while the second valve cap 41 and the second elastic part 42 are cooperatively installed in the second flow channel 22, and are respectively used for controlling the flow path of the lubricating grease.

[0043] In the working process, as shown in Figure 3 , when the first plunger 51 moves in the first direction S1, the pressure in the first flow channel 21 increases, driving the first valve cap 31 to press the first elastic part 32 to move in the first direction S1, so that the first flow channel 21 is in communication with the third flow channel 23, enabling the lubricating grease to flow into the third flow channel 23 and finally be output from the oil outlet hole 27. At the same time, the second valve body 40 is in a closed state, preventing the lubricating grease from flowing back to the second flow channel 22.

[0044] As shown in Figure 4 , when the first plunger 51 moves in the second direction S2 opposite to the first direction S1, the pressure in the first flow channel 21 decreases to a negative pressure state, and the first elastic part 32 pushes the first valve cap 31 back to the initial position under the action of the restoring force, and the first elastic part 32 drives the first valve cap 31 to move in the second direction S2 until it moves to the end of the stroke, thereby cutting off the first flow channel 21 from the third flow channel 23, ensuring that the lubricating grease will not flow back to the first flow channel 21. At the same time, the second plunger 52 moves in the first direction S1, the pressure in the second flow channel 22 increases, the second valve cap 41 is pushed and compresses the second elastic part 42, so that the second flow channel 22 is in communication with the third flow channel 23, realizing one-way delivery of the lubricating grease.

[0045] In this way, one-way flow of the lubricating grease is ensured, backflow and leakage are prevented, and automatic reset is realized by using elastic parts, thereby improving the reliability and sealing performance of the electric lubricating grease gun 100.

[0046] Further, as shown in Figure 3As shown, the second valve cap 41 includes a through hole 411, when the second valve body 40 controls the first flow channel 21 to be cut off from the third flow channel 23, the fluid in the first flow channel 21 passes through the third flow channel 23 and the through hole 411 to enter the oil outlet hole 27. In the state that the second valve body 40 cuts off the second flow channel 22 from the third flow channel 23, the through hole 411 allows the lubricating grease in the first flow channel 21 to pass through the through hole 411 and then be discharged through the third flow channel 23, so that the first valve body 30 and the second valve body 40 can share the third flow channel 23.

[0047] The first valve body 30 and the second valve body 40 are detachably connected to the shell 20, the first valve cap 31 reciprocates in the first flow channel 21 along the first direction S1, and the second valve cap 41 reciprocates in the second flow channel 22 along the first direction S1.

[0048] The first valve body 30 and the second valve body 40 are detachably connected to the shell 20, which is convenient for maintenance and replacement, and also convenient for adjusting different extension amounts. Users can easily remove the valve body for cleaning or replacement during equipment maintenance or lubricating grease replacement, avoiding the problem of blockage caused by long-term use. At the same time, the different up-and-down positions of the first valve body 30 and the second valve body 40 in the shell 20 ensure the degree of opening and closing of the valve, and ensure the smooth flow of lubricating grease in the flow channel. The detachable way can be screwed in or out in a rotating manner through thread cooperation.

[0049] As shown in the drawings, Figure 5 The shell 20 includes a protrusion 24, which is arranged at the middle position of the oil cavity 201, and the first flow channel 21, the second flow channel 22 and the third flow channel 23 are arranged in the protrusion 24; being located at the middle position can make the pressure in all directions almost uniform, and can be uniformly squeezed into the first flow channel 21 and the second flow channel 22 from all directions, preventing uneven oil intake of the flow channel.

[0050] When the first plunger 51 moves along the second direction S2 to move out of the first flow channel 21, the first flow channel 21 is communicated with the oil cavity 201; so that the lubricating grease in the oil cavity 201 can quickly enter the first flow channel 21 and then enter the third flow channel 23 for output through further control. Similarly, when the second plunger 52 moves along the second direction S2 and moves out of the second flow channel 22, the second flow channel 22 is communicated with the oil cavity 201, and the lubricating grease in the oil cavity 201 enters the second flow channel 22. Through such design, the lubricating grease can flow alternately between the first flow channel 21 and the second flow channel 22, ensuring the efficiency and stability of the lubrication process.

[0051] Further, as shown in the drawings, Figure 2 and 7As shown, the driving part 50 further comprises a crankshaft 53, a first crank 54, a second crank 56, a first universal joint 55 and a second universal joint 57, the crankshaft 53 comprises a power input end 531 for connecting a power device, the crankshaft 53 is rotationally connected with the first crank 54 and the second crank 56, the first crank 54 is connected with the first plunger 51 through the first universal joint 55, the second crank 56 is connected with the second plunger 52 through the second universal joint 57, and the crankshaft 53 drives the first plunger 51 and the second plunger 52 to reciprocate.

[0052] The crankshaft 53 is the core component of the entire driving system, and it is connected with the power device through the power input end 531 to realize the driving function of the electric grease gun 100. The rotation of the crankshaft 53 drives the first crank 54 and the second crank 56 to drive the first universal joint 55 and the second universal joint 57 respectively, and then drives the first plunger 51 and the second plunger 52 to reciprocate respectively. Since the universal joint has good angle adaptability and stable transmission, it can ensure that the plunger maintains stable reciprocating motion during driving. The rotation of the crankshaft 53 drives the crank system to move, thereby realizing automatic delivery and flow regulation of the grease. The driving part 50 has good shock resistance and durability, can withstand long-term working load, and ensures the stable operation of the electric grease gun 100 under high load and harsh environment.

[0053] Further, as shown in Figure 2 and 6 The housing 20 comprises a first cavity 25 and a second cavity 26, and the electric grease gun 100 further comprises a shell cover 60, the shell cover 60 seals the first cavity 25 and the second cavity 26, the first crank 54, the first universal joint 55 and part of the first plunger 51 are accommodated in the first cavity 25, the second crank 56, the second universal joint 57 and part of the second plunger 52 are accommodated in the second cavity 26, the shell cover 60 and the housing 20 enclose a plurality of annular grooves, and the bearings 532 sleeved on the crankshaft 53 are accommodated in the annular grooves.

[0054] The space of the first cavity 25 and the second cavity 26 can accommodate and effectively isolate the respective moving parts, avoid interference and friction between the parts, and ensure smooth operation of the system. Figure 2 The three annular grooves are arranged from left to right, and the corresponding three bearings 532 provide stable support for the movement of the crankshaft 53, effectively reducing friction and heat accumulation, thereby improving the service life and working efficiency of the grease gun. In addition, the first crank 54 and the second crank 56 are also connected with the crankshaft 53 through the bearings 532.

[0055] Further, the oil bucket 10 comprises a handle 11 and an elastic member, when the handle 11 is released, the elastic member drives the lubricating grease into the oil cavity 201. The handle 11 is used for user operation, through the grip and control of the handle 11, the oil bucket 10 can be easily filled with lubricating grease. The role of the elastic member is to ensure the automatic delivery of the lubricating grease, the elastic member is usually a spring or other forms of elastic material, when the handle 11 is released, the elastic member will push the lubricating grease stored in the oil bucket 10 into the oil cavity 201 by means of its elastic restoring force, ensuring the continuous supply of lubricating grease.

[0056] As shown in Figure 2 , 3 , 4, the shell 20 further comprises an exhaust hole 28 and an exhaust valve 281, the exhaust hole 28 communicates the oil cavity 201 with the outside, and the exhaust valve 281 controls the opening and closing of the exhaust hole 28. The communication between the exhaust hole 28 and the oil cavity 201 can effectively exhaust the air inside the oil cavity 201, preventing the gas from hindering the normal flow of the lubricating grease, or the gas from being injected into the equipment. The exhaust valve 281 controls the opening and closing of the exhaust hole 28, and closes the exhaust hole 28 after the exhaust is completed.

[0057] The exhaust hole 28 is arranged on the side of the shell 20 away from the oil bucket 10, and the opening direction of the exhaust hole 28 is upward. In this way, when the electric lubricating grease gun 100 is operated, the air in the oil bucket 10 can be completely exhausted as much as possible, and the lubricating grease will not be disturbed by the gas. Also make the exhaust hole 28 as much as possible to exhaust, less oil leakage, reduce the problem of lubricating grease flowing not smooth or unstable caused by gas retention, ensure the continuity and stability of the lubricating process.

[0058] The oil filling process of the electric lubricating grease gun 100 is as follows:

[0059] First, the user fills the lubricating grease into the oil bucket 10, ensuring that the oil bucket 10 is completely filled with lubricating grease. The oil bucket 10 is connected with the shell 20 in a sealed manner, forming a closed volume to prevent lubricating grease from leaking. After installation is completed, the user releases the handle 11, and the lubricating grease in the oil bucket 10 is driven into the oil cavity 201 by the elastic member, and is pushed to the first flow channel 21 and the second flow channel 22 which are not blocked by the first plunger 51 or the second plunger 52. After the air in the oil cavity 201 is exhausted through the exhaust hole 28, the exhaust hole 28 is closed.

[0060] When the electric lubricating grease gun 100 is started, the motor drives the crankshaft 53 to start rotating through the power input end 531. The rotation of the crankshaft 53 drives the first crank 54 and the second crank 56 to rotate, and then drives the first universal joint 55 and the second universal joint 57. These components drive the first plunger 51 and the second plunger 52 to reciprocate through the transmission action of the universal joint. The first plunger 51 and the second plunger 52 intermittently open the communication between the first flow channel 21, the second flow channel 22 and the oil cavity 201 during the movement,Figure 3 As shown, during the downward advancement of the first plunger 51, the second plunger 52 is advanced upward, and the second flow channel 22 is in communication with the oil cavity 201.

[0061] When the first plunger 51 moves downward, the pressure in the first flow channel 21 increases, the first valve body 30 controls the communication between the first flow channel 21 and the third flow channel 23, the second plunger 52 moves upward, the pressure in the second flow channel 22 decreases, the second flow channel 22 injects oil, the second valve body 40 controls the cutoff between the second flow channel 22 and the third flow channel 23, and the oil in the first flow channel 21 is discharged through the oil outlet hole 27.

[0062] When the second plunger 52 moves downward, the pressure in the second flow channel 22 increases, the second valve body 40 controls the communication between the second flow channel 22 and the third flow channel 23, the first plunger 51 moves upward, the pressure in the first flow channel 21 decreases, the first flow channel 21 injects oil, the first valve body 30 controls the cutoff between the first flow channel 21 and the third flow channel 23, and the oil in the second flow channel 22 is discharged through the oil outlet hole 27.

[0063] With the reciprocating movement of the plungers, the lubricating grease is controlled by the first valve body 30 and the second valve body 40, passes through the first flow channel 21, the second flow channel 22, and the third flow channel 23, and finally flows out to the oil outlet hole 27. After the lubricating grease flows out of the oil outlet hole 27, it enters the parts to be lubricated and lubricates them.

[0064] Compared with the prior art, the embodiment has the following beneficial effects:

[0065] The electric lubricating grease gun 100 significantly improves the working efficiency of the electric lubricating grease gun 100 through the innovative design of the drive part 50 and the flow channel. When the plungers move in the predetermined direction, the first valve body 30 and the second valve body 40 work together to accurately control the fluid path and ensure that the lubricating grease flows in the correct direction, avoiding pressure fluctuations caused by backflow. The electric lubricating grease gun 100 can achieve efficient and stable lubrication effect in different use scenarios through fine flow regulation and multi-channel design, and has strong market competitiveness and application prospect.

[0066] It should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0067] The series of detailed descriptions listed above are only specific descriptions for the feasible implementation manners of the present application, and are not used to limit the protection scope of the present application. Any equivalent implementation manners or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. An electric grease gun, characterized in that, include: Oil drums are used to store lubricating grease; The shell is sealed to the oil drum. The shell is provided with an oil cavity, a first flow channel, a second flow channel and a third flow channel. The shell is provided with an oil outlet hole. The third flow channel is connected to the oil outlet hole. A first valve body and a second valve body, wherein the first valve body controls the connection or disconnection between the first flow channel and the third flow channel, and the second valve body controls the connection or disconnection between the second flow channel and the third flow channel; A drive unit is disposed within the housing. The drive unit includes a first plunger and a second plunger. The first plunger is disposed within the first flow channel, and the second plunger is disposed within the second flow channel. The first plunger and the second plunger move in opposite directions. When the first plunger moves along the first direction, the first valve body controls the first flow channel to communicate with the third flow channel, and the second valve body controls the first flow channel to disconnect from the third flow channel; When the second plunger moves along the first direction, the first valve body controls the first flow channel to be cut off from the third flow channel, and the second valve body controls the first flow channel to be connected to the third flow channel.

2. The electric grease gun according to claim 1, characterized in that, The first valve body includes a first valve cap and a first elastic part, and the second valve body includes a second valve cap and a second elastic part; When the first plunger moves along the first direction, the first valve cap presses the first elastic part to move in the first direction. When the first plunger moves along a second direction opposite to the first direction, the first elastic part drives the first valve cap to move in the second direction until it reaches the end of its stroke. When the second plunger moves along the first direction, the second valve cap presses the second elastic part to move in the first direction. When the second plunger moves along the second direction, the second elastic part drives the second valve cap to move in the second direction until it reaches the end of its stroke.

3. The electric grease gun according to claim 2, characterized in that, The second valve cap includes a through hole. When the second valve body controls the first flow channel to be cut off from the third flow channel, the fluid in the first flow channel passes through the third flow channel and the through hole and enters the oil outlet.

4. The electric grease gun according to claim 2, characterized in that, Both the first valve body and the second valve body are detachably connected to the housing. The first valve cap reciprocates in the first flow channel along the first direction, and the second valve cap reciprocates in the second flow channel along the first direction.

5. The electric grease gun according to claim 1, characterized in that, The housing includes a protrusion located at the center of the oil cavity, and the first flow channel, the second flow channel, and the third flow channel are located within the protrusion. When the first plunger moves along the second direction to exit the first flow channel, the first flow channel connects to the oil chamber; When the second plunger moves along the second direction to exit the second flow channel, the second flow channel connects to the oil chamber.

6. The electric grease gun according to claim 1, characterized in that, The drive unit further includes a crankshaft, a first crank, a second crank, a first universal joint, and a second universal joint. The crankshaft includes a power input end for connecting a power unit. The crankshaft rotatably connects the first crank and the second crank. The first crank is connected to the first plunger through the first universal joint, and the second crank is connected to the second plunger through the second universal joint. The crankshaft drives the first plunger and the second plunger to reciprocate.

7. The electric grease gun according to claim 6, characterized in that, The housing includes a first cavity and a second cavity. The electric grease gun also includes a housing cover. The housing cover closes the first cavity and the second cavity. The first crank, the first universal joint, and part of the first plunger are housed in the first cavity. The second crank, the second universal joint, and part of the second plunger are housed in the second cavity. The housing cover and the housing together form a plurality of annular grooves. The bearings fitted onto the crankshaft are housed in the annular grooves.

8. The electric grease gun according to claim 1, characterized in that, The oil drum includes a handle and an elastic element. When the handle is released, the elastic element drives the grease into the oil chamber.

9. The electric grease gun according to claim 8, characterized in that, The housing also includes an exhaust port and an exhaust valve. The exhaust port connects the oil chamber to the outside, and the exhaust valve controls the opening and closing of the exhaust port.

10. The electric grease gun according to claim 9, characterized in that, The vent is located on the side of the housing away from the oil drum, and the opening of the vent is oriented upwards.

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