Handheld electric grease gun with heating function

Abstract

The handheld electric grease gun with the heating function comprises a main machine body, a rotary driver, a reciprocating motion conversion device and a grease supply device, the grease supply device comprises a grease storage barrel which is connected with the main machine body and used for storing grease, and a plunger cavity, a one-way valve cavity, a grease inlet and a grease outlet are formed in the main machine body. The oil inlet is communicated with the oil storage barrel and the plunger cavity, a plunger connected with the reciprocating motion conversion device is arranged in the plunger cavity, the reciprocating motion conversion device is connected with the rotary driver, the one-way valve cavity is communicated with the plunger cavity and the oil outlet, and a one-way valve is arranged in the one-way valve cavity. The opening groove connected with one end of the grease storage barrel is formed in the main machine body, the grease inlet is located in the opening groove, the heating device is fixed in the opening groove to heat grease in the grease storage barrel, and the grease gun is stable in grease outlet quantity and high in grease outlet efficiency when used in a low-temperature environment through heating of the heating device.

Description

Technical Field

[0001] The utility model relates to a grease gun, in particular to a handheld electric grease gun with a heating function. Background Art

[0002] A handheld electric grease gun is a refueling tool for adding grease to mechanical equipment. Its structure is generally composed of a gun head body, an oil storage cylinder, a single plunger structure, an eccentric transmission mechanism, a reduction motor, etc. The reduction motor drives the plunger to reciprocate through the slider transmission mechanism to achieve the filling of lubricating oil to the mechanical equipment. It is characterized by simple operation, labor-saving and convenience, high pressure, and fast refueling, and can basically meet the oiling requirements of general mechanical equipment.

[0003] For example, Chinese utility model patent CN211716213U discloses an electric grease gun, which includes a driving mechanism, a top cover and an oil supply mechanism detachably connected to the top cover, the oil supply mechanism includes a storage chamber and an oil storage cylinder detachably connected to the storage chamber, one end of the storage chamber is threadedly connected to the inner side of the top cover, the other end of the storage chamber is threadedly connected to the back cover, a pull rod is inserted into the back cover, a spring is sleeved on the pull rod, a pressure cover is provided at one end of the pull rod, a limit stop is provided on the back cover, one end of the limit stop is placed on the outer side of the back cover, the other end of the limit stop is sleeved on the pull rod and placed on the inner side of the back cover, so as to block the pull rod, and at the same time, the setting of the limit stop does not affect the forward and backward pulling of the pull rod.

[0004] Another example is a handheld electric grease gun disclosed in Chinese utility model patent CN218671541U, which includes a gun head body, an oil storage cylinder, and a reduction motor. A plunger cavity and an oil outlet channel are correspondingly provided on the gun head body, a plunger is provided in the plunger cavity, and the plunger cavity is divided into an upper oil chamber and a lower oil chamber by the plunger. An oil inlet hole connected to the oil storage cylinder is provided on the plunger cavity, and an upper oil outlet hole and a lower oil outlet hole connected to the oil outlet channel are correspondingly provided on the upper oil chamber and the lower oil chamber. A first check valve and a second check valve are correspondingly provided at the outlet ends of the upper oil outlet hole and the lower oil outlet hole. A slider chamber is provided on the gun head body, a slider is provided in the slider chamber, a plunger rod on the plunger is connected to the slider, the reduction motor drives the slider to move up and down in the slider chamber through an eccentric shaft, and the slider drives the plunger to reciprocate in the plunger cavity, so that the oil in the oil storage cylinder is pressed into the oil outlet channel from the oil outlet hole. An oil outlet connected to the oil outlet channel is provided on the gun head body, and an oil outlet nozzle is fixed on the oil outlet.

[0005] After research, it was found that for the same grease gun, for the same viscosity of grease, the oil output and oil output efficiency are different under different temperature environments. In a low temperature environment close to 0℃, the oil output of the same equipment is only about 2 / 3 of that in a normal room temperature of 25℃. This leads to low efficiency of the equipment under low temperature operating conditions. The existing handheld electric grease guns do not have the effect of heating the grease inside the oil storage cylinder, which can easily affect the construction progress under low temperature operating conditions. Utility Model Content

[0006] Based on the problem that the grease gun has low oil output and low efficiency under the above-mentioned low-temperature operating environment, the utility model provides a handheld electric grease gun with a heating function.

[0007] The technical solution adopted by the utility model to solve the above technical problems is: a handheld electric grease gun with a heating function, comprising a main body, a rotary drive, a reciprocating motion conversion device and an oil supply device, the oil supply device comprising an oil storage cylinder connected to the main body for storing grease, a plunger cavity, a one-way valve cavity, an oil inlet and an oil outlet are arranged in the main body, the oil inlet is connected to the oil storage cylinder and the plunger cavity, a plunger connected to the reciprocating motion conversion device is arranged in the plunger cavity, the reciprocating motion conversion device is connected to the rotary drive, and the reciprocating motion conversion device converts the rotational power of the rotary drive into the rotational power of the plunger Reciprocating linear motion, the one-way valve chamber connects the plunger chamber and the oil outlet, a one-way valve is provided in the one-way valve chamber to limit the grease to flow from the plunger chamber to the oil outlet, and it is characterized in that it also includes a control circuit board, a temperature sensor and a heating device for detecting the temperature of the oil storage cylinder, the temperature sensor and the heating device are both electrically connected to the control circuit board, an open groove is provided on the main body, one end of the oil storage cylinder is connected to the open groove, and the open groove is connected to the inside of the oil storage cylinder, the oil inlet falls in the open groove, and the heating device is fixed in the open groove to heat the grease in the oil storage cylinder.

[0008] A further preferred technical solution of the utility model is: a plunger cavity is provided in the open groove, a plunger cavity for reciprocating movement of the plunger is provided inside the plunger cavity, the plunger cavity includes an upper cavity and a lower cavity, the upper cavity and the lower cavity are connected to the interior of the open groove with a spacing, the cavity opening of the upper cavity located within the spacing is opposite to the cavity opening of the lower cavity located within the spacing, the cavity opening on the lower cavity opposite to the upper cavity is used as an oil inlet for oil inlet, and the one-way valve cavity is connected to one end of the lower cavity away from the oil inlet.

[0009] A further preferred technical solution of the utility model is: there are two heating devices, the two heating devices are respectively located on both sides of the plunger cavity, and the heating devices are opposite to each other.

[0010] A further preferred technical solution of the utility model is: the heating device is fixed on the inner bottom opposite to the notch in the open groove by means of screws.

[0011] A further preferred technical solution of the utility model is: the heating part of the heating device does not protrude from the notch of the open slot, the oil storage cylinder has an open end which is inserted into the open slot and fixed to the main body, and the heating part of the heating device partially extends into the oil storage cylinder.

[0012] A further preferred technical solution of the utility model is: the heating device is a PTC heating element.

[0013] A further preferred technical solution of the utility model is: the temperature sensor is arranged on the outer side wall of the oil storage cylinder.

[0014] A further preferred technical solution of the utility model is: the one-way valve includes a steel ball and a pressure spring, the lower cavity is connected to the one-way valve cavity through a connecting port, the pressure spring presses the steel ball at the connecting port to seal the connecting port, and an oil outlet channel is provided in the main body to connect the one-way valve cavity and the oil outlet.

[0015] A further preferred technical solution of the utility model is: the rotary driver includes a driving motor and a planetary gear reducer, the motor shaft of the driving motor is connected to the input end of the planetary gear reducer, the reciprocating motion conversion device includes an eccentric wheel with an eccentric shaft and a slider, the eccentric wheel is arranged on the main body, and can rotate around its own axis relative to the main body, the eccentric wheel is connected to the output end of the planetary gear reducer, the plunger is fixed to the slider, a slide groove hole is provided on the slider, the eccentric shaft of the eccentric wheel is inserted into the slide groove hole and can slide laterally relative to the slider along the slide groove hole, and when the eccentric wheel rotates, the eccentric shaft drives the slider and the plunger to move back and forth in a straight line.

[0016] A further preferred technical solution of the utility model is: the oil supply device includes a pull rod inserted into the oil storage cylinder, a spring sleeved on the pull rod, and an oil pressing part fixed on one end of the pull rod located in the oil storage cylinder, and the spring pushes the oil pressing part to press the grease in the oil storage cylinder into the oil inlet for the plunger to squeeze.

[0017] Compared with the prior art, the utility model has the advantages that the grease gun comprises a control circuit board, a temperature sensor for detecting the temperature of the oil storage cylinder and a heating device, the temperature sensor and the heating device are both electrically connected to the control circuit board, an open slot is provided on the main body, one end of the oil storage cylinder is connected to the open slot, and the open slot is communicated with the inside of the oil storage cylinder, the oil inlet falls in the open slot, the heating device is fixed in the open slot to heat the grease in the oil storage cylinder, when the grease gun is used, the control circuit board is powered on to start the internal control program, the temperature of the oil storage cylinder is detected by the temperature sensor and a signal is transmitted to the control circuit board, a temperature setting value for comparison is set in the control circuit board, when the temperature detected by the temperature sensor is lower than the temperature setting value, the control circuit board controls the heating device to heat the grease in the oil storage cylinder, when the temperature detected by the temperature sensor reaches the temperature setting value, the control circuit board controls the heating device to stop heating, heating by the heating device makes the grease output stable and the oil output efficiency high when the grease gun is used in a low temperature environment, the grease temperature in the oil storage cylinder is controllable through the control circuit board program control, the heating device is built-in and directly contacts the grease inside the oil storage cylinder, and the heating effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of the utility model after one side of the housing is removed;

[0020] Figure 2 Schematic diagram of the main body and oil supply device Figure 1 ;

[0021] Figure 3 Schematic diagram of the main body and oil supply device Figure 2 ;

[0022] Figure 4 This is a disassembled diagram of the eccentric wheel and the slider;

[0023] Figure 5 It is a cutaway schematic diagram of the utility model;

[0024] Figure 6 for Figure 5 A local enlarged view of point A;

[0025] Figure 7 This is a schematic diagram of the structure of the main body.

[0026] In the figure: 1. main body; 2. body shell; 3. power switch; 4. control circuit board; 5. handle; 6. battery pack plug-in slot; 7. motor cavity; 8. oil storage cylinder; 9. pull rod; 10. connecting ring; 11. sleeve; 12. reciprocating motion conversion device; 13. plunger; 14. filling valve; 15. vent valve; 16. oil outlet; 17. planetary gear reducer; 18. slider; 19. slide groove hole; 20. eccentric wheel; 21. eccentric shaft; 22. center shaft; 23. oil pressure part; 24. bearing; 25. opening groove; 26. heating device; 27. plunger cavity; 28. oil inlet; 29. ​​one-way valve cavity; 30. pressure spring; 31. steel ball; 32. connecting port; 33. oil outlet channel; 34. upper cavity; 35. lower cavity; 36. screw; 37. spacing. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0028] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0029] Figure 1-Figure 7 As shown, the handheld electric grease gun with heating function includes a main body 1, a rotary drive, a reciprocating motion conversion device 12, an oil supply device, a control circuit board 4, a temperature sensor and a heating device 26.

[0030] The oil supply device is the same as the existing handheld electric grease gun in the art. Preferably, the oil supply device includes an oil storage barrel 8 connected to the main body 1 for storing grease, a pull rod 9 inserted into the oil storage barrel 8, a spring sleeved on the pull rod 9, and an oil pressing part 23 fixed on one end of the pull rod 9 located in the oil storage barrel 8. When adding grease to the oil storage barrel 8, the pull rod 9 can be locked by a limit stopper.

[0031] An organic housing 2 is installed outside the main body 1. The organic housing 2 comprises a left half shell and a right half shell, and the left half shell and the right half shell are fixed together by screws after being matched.

[0032] A handle 5 is provided on the body shell 2 for holding by hand, a battery pack insertion slot 6 is provided at the rear end of the handle 5, a start-stop switch is provided on the body shell 2, a connecting ring 10 is provided at the bottom of the body shell 2 and is embraced on the outside of the oil storage cylinder 8, a control circuit board 4 is installed in the body shell 2, and a power switch 3 is provided on the control circuit board 4.

[0033] Figure 5 , Figure 6 As shown, the main body 1 is provided with a plunger cavity 27, a one-way valve cavity 29, an oil inlet 28 and an oil outlet 16, the oil inlet 28 is connected to the oil storage cylinder 8 and the plunger cavity 27, the plunger cavity 27 is provided with a plunger 13 connected to a reciprocating motion conversion device 12, the reciprocating motion conversion device 12 is connected to a rotary drive, the reciprocating motion conversion device 12 converts the rotary power of the rotary drive into a reciprocating linear motion of the plunger 13, the one-way valve cavity 29 is connected to the plunger 13 and the oil outlet 16, and the one-way valve cavity 29 is provided with a one-way valve for limiting the flow of grease from the plunger cavity 27 to the oil outlet 16.

[0034] Preferably, the plunger 13 is a round rod-shaped structure, and the plunger cavity 27 is a round long hole that matches the shape of the plunger 13 . The plunger cavity 27 restricts the plunger 13 from moving in a straight line.

[0035] Preferably, the rotary driver comprises a driving motor and a planetary gear reducer 17, wherein the motor shaft of the driving motor is connected to the input end of the planetary gear reducer 17, and the rotary power is outputted through the output end of the planetary gear reducer 17. The driving motor is fixed in the motor cavity 7 formed inside the housing 2, and the main body 1 is provided with a sleeve 11 located in the housing 2, the sleeve 11 is located in front of the motor cavity 7, the sleeve 11 has a rearward opening, and the planetary gear reducer 17 is installed in the sleeve 11 from the opening of the sleeve 11. The driving motor is not shown in the drawings.

[0036] Figure 4 As shown, preferably, the reciprocating motion conversion device 12 includes an eccentric wheel 20 having an eccentric shaft 21 and a slider 18. The eccentric wheel 20 is arranged on the main body 1 and can rotate around its own axis relative to the main body 1. The eccentric wheel 20 is connected to the output end of the planetary gear reducer 17, the plunger 13 is fixed to the slider 18, and a slide groove hole 19 is opened on the slider 18. The eccentric shaft 21 of the eccentric wheel 20 is inserted into the slide groove hole 19 and can slide laterally along the slide groove hole 19 relative to the slider 18. When the eccentric wheel 20 rotates, the eccentric shaft 21 drives the slider 18 and the plunger 13 to move reciprocatingly in a straight line. Specifically, the eccentric wheel 20 is a circular cylindrical structure, and a central shaft 22 extending backward is provided at the axis of the eccentric wheel 20, and an axial hole communicating with the sleeve 11 is provided at the front side of the sleeve 11. The central shaft 22 passes through the axial hole provided on the main body 1 and is connected to the output end of the planetary gear reducer 17. A bearing 24 is provided between the central shaft 22 and the main body 1, and an eccentric shaft 21 eccentric to the central shaft 22 is provided at the front side of the eccentric wheel 20. The reciprocating motion conversion device 12 converts the rotary power of the rotary driver into the reciprocating linear motion of the plunger 13, which is the same as the handheld electric grease gun in the art.

[0037] The temperature sensor is used to detect the temperature of the oil storage barrel 8. Preferably, the temperature sensor is arranged on the outer wall of the oil storage barrel 8. Alternatively, the temperature sensor can be arranged inside the oil storage barrel 8. The temperature sensor is not shown in the drawings.

[0038] The temperature sensor and the heating device 26 are both electrically connected to the control circuit board 4 .

[0039] Figure 7 As shown, an open groove 25 is opened on the main body 1, one end of the oil storage cylinder 8 is connected to the open groove 25, and the open groove 25 is communicated with the inside of the oil storage cylinder 8, the oil inlet 28 falls in the open groove 25, and the heating device 26 is fixed in the open groove 25 to heat the grease in the oil storage cylinder 8.

[0040] When the grease gun is used, the control circuit board 4 is powered on to start the internal control program, and the temperature of the oil storage barrel 8 is detected by the temperature sensor and a signal is transmitted to the control circuit board 4. A temperature setting value for comparison is set in the control circuit board 4. When the temperature detected by the temperature sensor is lower than the temperature setting value, the control circuit board 4 controls the heating device 26 to heat the grease in the oil storage barrel 8. When the temperature detected by the temperature sensor reaches the temperature setting value, the control circuit board 4 controls the heating device 26 to stop heating. The heating by the heating device 26 makes the grease gun stable in oil output and high in oil output efficiency when used in a low temperature environment. The control of the control circuit board 4 program makes the grease temperature in the oil storage barrel 8 controllable. The heating device 26 is built-in and directly contacts the grease inside the oil storage barrel 8, so the heating effect is better.

[0041] Preferably, the set temperature setting value is a range, for example, the temperature setting value is set at 20°C-30°C in the control circuit board 4. When the temperature sensor senses that the temperature is lower than 20°C, the control circuit board 4 controls the heating device 26 to heat. When the temperature sensor senses that the heating device 26 heats the grease in the oil storage cylinder 8 to 30°C, the control circuit board 4 controls the heating device 26 to stop heating to achieve a temperature that is more suitable for using a grease gun.

[0042] Preferably, the heating portion of the heating device 26 does not protrude from the slot of the opening slot 25, the oil storage cylinder 8 has an open end inserted into the opening slot 25 and fixed to the main body 1, and the heating portion of the heating device 26 extends into the oil storage cylinder 8 to heat the grease in the oil storage cylinder 8.

[0043] Preferably, a plunger cavity is provided in the opening groove 25, and a plunger cavity 27 for the reciprocating movement of the plunger 13 is provided inside the plunger cavity. The plunger cavity includes an upper cavity 34 and a lower cavity 35. The upper cavity 34 and the lower cavity 35 are connected to the interior of the opening groove 25 with a spacing 37 therebetween. The cavity opening of the upper cavity 34 located in the spacing 37 is opposite to the cavity opening of the lower cavity 35 located in the spacing 37. The cavity opening of the lower cavity 35 opposite to the upper cavity 34 is used as an oil inlet 28 for oil inlet. The one-way valve cavity 29 is connected to one end of the lower cavity 35 away from the oil inlet 28.

[0044] Preferably, the one-way valve includes a steel ball 31 and a pressure spring 30. The lower cavity 35 is connected to the one-way valve cavity 29 via a connecting port 32. The pressure spring 30 presses the steel ball 31 against the connecting port 32 to block the connecting port 32. An oil outlet channel 33 is provided in the main body 1 to connect the one-way valve cavity 29 and the oil outlet 16.

[0045] The working principle of the electric grease gun is that the start-stop switch is pressed to control the drive motor to start. The drive motor drives the eccentric wheel 20 to rotate around the central axis 22 through the planetary gear reducer 17, and the eccentric shaft 21 on the eccentric wheel 20 rotates eccentrically. While the eccentric shaft 21 rotates eccentrically, it slides horizontally in the slide slot hole 19, thereby driving the slider 18 and the plunger 13 to make reciprocating linear movements up and down. When the plunger 13 moves upward and moves out of the lower cavity 35, a negative pressure can be generated in the closed oil storage cylinder 8. The grease in the oil storage cylinder 8 will flow into the lower cavity 35 through the oil inlet 28 under the action of this negative pressure and the spring in the oil storage cylinder 8. When the plunger 13 moves downward, the plunger 13 is inserted into the lower cavity 35 from the oil inlet 28. The grease in the lower cavity 35 is forced out to the one-way valve cavity 29 by the plunger 13 through the one-way valve, and then sprayed out from the oil outlet 16 through the oil outlet channel 33 for adding grease to the required equipment. The spring can push the oil pressing part 23 to press the grease in the oil storage cylinder 8 into the oil inlet 28 for the plunger 13 to squeeze.

[0046] Preferably, there are two heating devices 26 , which are respectively located on both sides of the plunger cavity, and the heating devices 26 are opposite to the spacing 37 to better heat the grease near the oil inlet 28 .

[0047] Preferably, the heating device 26 is fixed to the inner bottom of the opening slot 25 opposite to the slot by means of screws 36 .

[0048] Preferably, the heating device 26 is a PTC heating element, and the PTC heating element is connected to the control circuit board 4 through a wire.

[0049] Figure 2 , Figure 3 As shown, other structures are the same as those of the existing handheld electric grease guns. For example, the main body 1 is provided with an air release valve 15 for discharging the air inside the oil storage cylinder 8, and a refueling valve 14 for adding grease to the oil storage cylinder 8.

[0050] The above is an introduction to the handheld electric grease gun with heating function provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A handheld electric grease gun with a heating function, comprising a main body, a rotary drive, a reciprocating motion conversion device and an oil supply device, wherein the oil supply device comprises an oil storage cylinder connected to the main body for storing grease, a plunger cavity, a one-way valve cavity, an oil inlet and an oil outlet are arranged in the main body, the oil inlet is connected to the oil storage cylinder and the plunger cavity, a plunger connected to the reciprocating motion conversion device is arranged in the plunger cavity, the reciprocating motion conversion device is connected to the rotary drive, the reciprocating motion conversion device converts the rotary power of the rotary drive into the reciprocating linear motion of the plunger, the one-way valve cavity is connected to the plunger cavity and the oil outlet, a one-way valve is arranged in the one-way valve cavity to limit the grease to flow only from the plunger cavity to the oil outlet, and the characteristics are as follows: It also includes a control circuit board, a temperature sensor for detecting the temperature of the oil storage cylinder, and a heating device. The temperature sensor and the heating device are electrically connected to the control circuit board. An open groove is opened on the main body. One end of the oil storage cylinder is connected to the open groove, and the open groove is connected to the inside of the oil storage cylinder. The oil inlet falls into the open groove. The heating device is fixed in the open groove to heat the grease in the oil storage cylinder.

2. The handheld electric grease gun with heating function according to claim 1, characterized in that: A plunger cavity is provided in the open groove, and a plunger cavity for the reciprocating movement of the plunger is provided inside the plunger cavity. The plunger cavity includes an upper cavity and a lower cavity. The upper cavity and the lower cavity are connected to the interior of the open groove with a spacing therebetween. The cavity opening of the upper cavity located within the spacing is opposite to the cavity opening of the lower cavity located within the spacing. The cavity opening on the lower cavity opposite to the upper cavity is used as an oil inlet for oil intake, and the one-way valve cavity is connected to one end of the lower cavity away from the oil inlet.

3. The handheld electric grease gun with heating function according to claim 2, characterized in that: There are two heating devices, which are respectively located on two sides of the plunger cavity, and the heating devices are opposite to each other.

4. The handheld electric grease gun with heating function according to claim 1, characterized in that: The heating device is fixed on the inner bottom opposite to the notch in the open slot by screws.

5. The handheld electric grease gun with heating function according to claim 1, characterized in that: The heating part of the heating device does not protrude from the notch of the opening slot, the oil storage cylinder has an open end that is inserted into the opening slot and fixed to the main body, and the heating part of the heating device partially extends into the oil storage cylinder.

6. The handheld electric grease gun with heating function according to claim 1, 2, 3, 4 or 5, characterized in that: The heating device is a PTC heating element.

7. The handheld electric grease gun with heating function according to claim 1, characterized in that: The temperature sensor is arranged on the outer side wall of the oil storage cylinder.

8. The handheld electric grease gun with heating function according to claim 2, characterized in that: The one-way valve includes a steel ball and a pressure spring. The lower cavity is connected to the one-way valve cavity through a connecting port. The pressure spring presses the steel ball against the connecting port to block the connecting port. An oil outlet channel is provided in the main body to connect the one-way valve cavity and the oil outlet.

9. The handheld electric grease gun with heating function according to claim 1, characterized in that: The rotary driver includes a driving motor and a planetary gear reducer. The motor shaft of the driving motor is connected to the input end of the planetary gear reducer. The reciprocating motion conversion device includes an eccentric wheel with an eccentric shaft and a slider. The eccentric wheel is arranged on the main body and can rotate around its own axis relative to the main body. The eccentric wheel is connected to the output end of the planetary gear reducer. The plunger is fixed to the slider. A slide slot hole is provided on the slider. The eccentric shaft of the eccentric wheel is inserted into the slide slot hole and can slide laterally relative to the slider along the slide slot hole. When the eccentric wheel rotates, the eccentric shaft drives the slider and the plunger to move back and forth in a straight line.

10. The handheld electric grease gun with heating function according to claim 1, characterized in that: The oil supply device includes a pull rod inserted into the oil storage cylinder, a spring sleeved on the pull rod, and an oil pressing part fixed on one end of the pull rod located in the oil storage cylinder. The spring pushes the oil pressing part to press the grease in the oil storage cylinder into the oil inlet for the plunger to squeeze.

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