Electric barrel-inserting lubricating pump

Abstract

The utility model relates to the field of lubricating equipment, and discloses an electric barrel inserting lubricating pump which comprises a motor, a speed reducing mechanism, a pump body, a pull rod, a pump pipe, an oil return sleeve and a barrel cover, the speed reducing mechanism comprises a worm gear and a worm, an oil pressing disc is sleeved outside the oil return sleeve and integrally placed in an oil barrel, and the oil return sleeve is sleeved on the periphery of the pump pipe. An inner hole of the oil pressing disc is matched with the outer circle of the oil return sleeve, a sealing ring is arranged between an outer ring of the oil pressing disc and the oil barrel, four moon-shaped oil return grooves are evenly formed in the flange threads of the head of the oil return sleeve, and a laser ranging type liquid level sensor is arranged on the barrel cover. The pump pipe is sleeved with the coaxial oil return sleeve, lubricating pump overflow return oil and return oil externally connected with an oil return opening can flow back to the bottom of the oil barrel through an annular gap between the pump pipe and the oil return pipe, an oil return hose does not need to be additionally arranged to be connected with the oil pressing disc, operation is more reliable, the oil pressing disc structure with the sealing ring is tightly matched with the inner wall of the grease barrel, and no lubricating grease is left on the barrel wall. And the lubricating grease at the bottom of the barrel is basically absorbed completely, so that the utilization rate of the lubricating grease is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lubrication equipment, in particular to an electric barrel lubrication pump. Background Art

[0002] Electric lubrication pumps are widely used as the core components of dry oil automatic lubrication systems. Conventional electric lubrication pumps are all pump bodies with oil storage barrels. Grease manufacturers supply grease in 200L standard oil barrels. The current conventional practice is to set up a dedicated electric refueling pump and place it on the 200L standard oil barrel. The grease is injected into the lubrication pump oil storage barrel through the refueling pump. This method has the following disadvantages: (1) Setting up two pumps takes up a lot of space. In order to realize the refueling interlock between the lubrication pump and the refueling pump, a corresponding liquid level detection and electrical control system must be set up. (2) When the temperature is low or high-viscosity grease is used, the refueling pump is prone to emptying. Long-term lack of oil will cause failure, and air will be mixed with the grease to replenish the lubrication pump oil storage barrel, causing the lubrication pump to suck empty failure. (3) When using an electric refueling pump, there is a lot of grease residue on the inner wall and bottom of the oil barrel, which is a serious waste. The existing barrel lubrication pumps are basically pneumatic pumps or electric pumps that use pneumatic lifting frames to assist in oil pressure. A compressed air source must be available on site, which limits their promotion and use.

[0003] In the document ZL CN201520927809, a high-pressure precision oil pipe for a diesel engine is disclosed, comprising a plurality of high-pressure precision pipe bodies of the same length and bending radius; the high-pressure precision pipe body comprises an inner high-pressure tight pipe and an outer pipe formed into one piece by extension and deformation; the maximum inner surface crack depth of the inner high-pressure tight pipe is not greater than 25μm; a sleeve installation position is pressed on the surface of the outer pipe; a pipe sleeve is installed at the sleeve installation position; and an oil return pipe is installed on the pipe sleeve. In this structure, although an oil return pipe is provided outside the sleeve, the oil return pipe is not completely covered outside the sleeve. In this way, it is easy to be sucked into air during use, which reduces the service life. Utility Model Content

[0004] In order to solve the above problems, the utility model discloses an electric barrel lubrication pump with compact structure, reliable oil suction, convenient replacement and maintenance, which can effectively suck out the grease at the bottom of the barrel, improve the utilization rate of the grease, prevent the phenomenon of empty suction, and increase the service life.

[0005] The technical scheme of the utility model is: an electric barrel lubrication pump, comprising a motor, a reduction mechanism, a pump body, a pull rod, a pump pipe, an oil return sleeve and a barrel cover, the reduction mechanism comprising a worm gear and a worm, an oil pressure plate is sleeved outside the oil return sleeve and is placed in the oil barrel as a whole, the oil return sleeve is sleeved on the periphery of the pump pipe, the inner hole of the oil pressure plate is matched with the outer circle of the oil return sleeve, a sealing ring is arranged between the outer ring of the oil pressure plate and the oil barrel, four crescent-shaped oil return grooves are arranged at the threaded part of the head flange of the oil return sleeve, and a laser ranging type liquid level sensor is arranged on the barrel cover.

[0006] By adopting the above technical solution, the grease can be directly sucked out of the grease barrel, the transfer links can be reduced, the work efficiency can be effectively improved, and the oil suction efficiency can also be greatly improved.

[0007] Preferably, the motor is located at the top of the box, the worm and worm wheel are installed in the box, the worm head is connected to the motor, the worm wheel and the eccentric shaft end head are fixed, the eccentric shaft passes through the bearing inner holes of the large bearing and the small bearing installed on the box, and is fixed with a shaft retaining ring, the eccentric shaft of the eccentric shaft is provided with a copper sleeve, and the sleeve outer cover is provided with a slider.

[0008] By adopting the above technical solution, the worm wheel and the worm cooperate to form a worm gear reduction mechanism to convert the rapid rotation of the motor into the slow rotation of the worm wheel, and convert the rotation into the up and down movement of the slider through the eccentric shaft.

[0009] Preferably, the lower part of the box body is connected and fixed to the pump body, and the pump body is provided with a pressure gauge, a relief valve, an oil return port, and an oil outlet. A through hole with a sealing groove is provided inside the pump body, and the pull rod head and the slider are connected and fixed. The rod body of the pull rod passes through the through hole of the pump body, the combined sealing ring, the sealing positioning sleeve, and the inner cavity of the pump tube in sequence and is connected to the plunger. The outer ring of the combined sealing ring forms a static seal with the sealing groove of the pump body, and the inner ring forms a dynamic seal with the rod body of the pull rod.

[0010] Preferably, a small piston cavity is provided inside the plunger, a control piston is installed in the cavity, an oil outlet hole is further provided on the circumference of the plunger, the oil outlet hole is connected to the internal small piston cavity, a spring is installed between the upper positioning boss of the control piston and the bottom positioning boss of the pull rod, a pump cylinder is provided at the lower part of the plunger, a piston cavity and an oil suction hole cooperating with the plunger are provided in the middle part of the pump cylinder, one end of the oil suction hole is connected to the piston cavity and the other end is connected to external grease, and a thread is provided on the upper outer circle of the pump cylinder.

[0011] Preferably, the lower part of the through hole with a sealing groove inside the pump body is a threaded hole, the pump tube head is threaded into the threaded hole and pressed and sealed with the upper sealing positioning sleeve, and the threads of the pump tube bottom and the pump cylinder are tightened and sealed.

[0012] Preferably, the head flange of the oil return sleeve is provided with threads, which are fixed to the outside of the pump pipe by threads, are coaxial with the pump pipe, and leave an oil-passing ring-shaped gap in the middle; an O-ring groove is provided at the top of the oil return sleeve flange, and an O-ring is installed in the O-ring groove to form a seal with the pump body; two communicating oil return flow channel holes are provided between the lower part of the pump body and the inner cavity of the O-ring groove, which respectively lead to the oil return chamber of the overflow valve and the oil return port of the pump body; and the moon-shaped oil return groove is located at the thread of the head flange of the oil return sleeve.

[0013] By adopting the above technical solution, the upper and lower chambers of the flange are connected, so that the return oil of the pump body can be directly drained back to the bottom of the oil barrel through the channel between the pump pipe and the oil return sleeve.

[0014] Preferably, a sealed chamber, i.e., an oil pressure chamber, is formed between the plunger, the pull rod and the pump pipe. The lower part of the oil pressure chamber is isolated from the oil suction hole by the precise fit between the outer cylindrical surface of the plunger and the piston hole of the pump cylinder. The upper part of the sealed chamber is isolated from the transmission chamber inside the upper box by the motion seal formed by the pull rod and the combined sealing ring. The pump body is connected to the oil outlet and the oil inlet hole of the overflow valve through the oil outlet flow channel hole.

[0015] Preferably, a barrel cover is fixedly mounted on the lower plane of the pump body, and a through hole slightly larger than the flange of the oil return sleeve head is provided in the middle of the barrel cover for the oil return sleeve to pass through.

[0016] Preferably, two chains are provided between the barrel cover and the oil pressure plate, and a laser ranging liquid level sensor is fixed on the upper part of the barrel cover, and the emitted laser beam is directly irradiated on the upper plane of the oil pressure plate.

[0017] By adopting the above technical scheme, the oil pressure plate is guided by the oil return sleeve and moves with the oil level in the barrel, always keeping close to the grease in the barrel, preventing the lubrication pump from sucking out air due to the mixing of air into the grease. There is no grease residue on the wall of the oil barrel. When the grease in the oil barrel is used up and a new oil barrel is replaced, the oil pressure plate can be pulled out of the oil barrel together with the entire pump. The laser ranging liquid level sensor can provide real-time feedback on the grease storage in the barrel, and has good reliability.

[0018] The benefits of the utility model are as follows: 1. A coaxial oil return sleeve is arranged outside the pump pipe of the utility model. The overflow return oil of the lubrication pump and the return oil from the external connection of the oil return port can flow back to the bottom of the oil barrel through the annular gap between the pump pipe and the oil return pipe. There is no need to set up a special oil return hose to connect with the oil pressure plate, and there will be no interference with the hose liquid level sensor, so the operation is more reliable.

[0019] 2. The utility model has a sealing ring oil pressure plate structure, which is closely matched with the inner wall of the grease barrel. There is no grease residue on the barrel wall and no oil spillage. The grease at the bottom of the barrel can be basically absorbed, which greatly improves the utilization rate of the grease and is energy-saving and environmentally friendly.

[0020] 3. The utility model electric barrel lubrication pump adopts a built-in one-way valve piston bottom suction structure, which has a compact structure, reliable oil suction, and convenient replacement and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the utility model in use state;

[0023] Figure 3 This is a schematic diagram of the structure of the oil return tank of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure inside the box of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the plunger and pump cylinder of the utility model.

[0026] Among them: 1. motor, 2. housing, 3. worm, 4. worm gear, 5. pressure gauge, 6. oil return port, 7. oil outlet, 8. barrel cover, 9. chain, 10. oil pressure plate, 11. large bearing, 12. small bearing, 13. shaft retaining ring, 14. eccentric shaft, 15. copper sliding sleeve, 16. slider, 17. pull rod, 18. combined sealing ring, 19. overflow valve, 20. sealing locating sleeve, 21. pump body, 22. O-ring groove, 23. oil return sleeve, 23-1, oil return groove, 24. pump pipe, 25. plunger, 26. spring, 27. control piston, 28. pump cylinder, 29. oil suction hole, 30. oil outlet hole, 31. oil pressure chamber, 32. laser ranging liquid level sensor, 33. oil return flow channel hole. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the utility model.

[0028] like Figure 1-5 As shown, an electric plug-in barrel lubrication pump includes a motor 1, a reduction mechanism, a pump body 21, a pull rod 17, a pump pipe 24, an oil return sleeve 23 and a barrel cover 8. The reduction mechanism includes a worm gear 4 and a worm 3. The oil return sleeve 23 is sleeved on the periphery of the pump pipe 24. The oil pressure plate 10 is sleeved outside the oil return sleeve 23 and is placed in the oil barrel as a whole. A sealing ring is provided between the outer ring of the oil pressure plate 10 and the oil barrel. Four crescent-shaped oil return grooves 23-1 are provided at the head flange thread of the oil return sleeve 23. A laser ranging liquid level sensor 32 is provided on the barrel cover 8. The electric plug-in barrel lubrication pump can directly absorb grease in the grease barrel, reduce the transfer links, effectively improve the work efficiency, and greatly improve the oil absorption efficiency.

[0029] The motor 1 is located at the top of the housing 2, the worm 3 and the worm wheel 4 are installed in the housing 2, the head of the worm 3 is connected to the motor 1, the worm wheel 4 and the shaft end head of the eccentric shaft 14 are fixed, the eccentric shaft 14 passes through the bearing inner holes of the large bearing 11 and the small bearing 12 installed on the housing 2, and is fixed with a shaft retaining ring 13, the eccentric shaft of the eccentric shaft 14 is sleeved with a copper sliding sleeve 15, and the outer sleeve of the sliding sleeve is provided with a slider 16, the worm wheel 4 and the worm 3 cooperate to form a worm gear reduction mechanism to convert the rapid rotation of the motor 1 into the slow rotation of the worm wheel 4, and convert the rotation into the up and down movement of the slider 16 through the eccentric shaft 14.

[0030] The lower part of the box body 2 is connected and fixed to the pump body 21. The pump body 21 is provided with a pressure gauge 5, a relief valve 19, an oil return port 6, and an oil outlet 7. The inside of the pump body 21 is provided with a through hole with a sealing groove. The head of the pull rod 17 and the slider 16 are connected and fixed. The rod body of the pull rod 17 passes through the pump body through hole, the combined sealing ring 18, the sealing positioning sleeve 20, and the inner cavity of the pump pipe 24 in sequence and is connected to the plunger 25. The outer ring of the combined sealing ring 18 forms a static seal with the pump body sealing groove, and the inner ring forms a dynamic seal with the rod body of the pull rod 17.

[0031] A small piston cavity is provided inside the plunger 25, in which a control piston 27 is installed. An oil outlet hole 30 is provided on the circumference of the plunger 25, which is communicated with the internal small piston cavity. A spring 26 is installed between the upper positioning boss of the control piston 27 and the bottom positioning boss of the pull rod 17. A pump cylinder 28 is provided at the lower part of the plunger 25, and a piston cavity and an oil suction hole 29 cooperating with the plunger 25 are provided in the middle part of the pump cylinder 28. One end of the oil suction hole 29 is connected to the piston cavity and the other end is connected to external grease. A thread is provided on the upper outer circle of the pump cylinder 28.

[0032] The lower part of the through hole with sealing groove inside the pump body 21 is a threaded hole, the head of the pump pipe 24 is screwed into the threaded hole and sealed and fixed with the sealing positioning sleeve 20 at the upper part, and the threads of the bottom of the pump pipe 24 and the pump cylinder 28 are tightened and sealed.

[0033] The head flange of the return oil sleeve 23 is provided with threads, which are fixed to the outside of the pump pipe 24 through threads. It is coaxial with the pump pipe 24, with an oil-passing annular gap in the middle. An O-ring groove 22 is provided on the top of the flange of the return oil sleeve 23. An O-ring is built into the O-ring groove 22 to form a seal with the pump body 21. Two oil return flow channel holes 33 are provided between the lower part of the pump body 21 and the inner cavity of the O-ring groove 22, which are connected to the oil return cavity of the overflow valve 19 and the oil return port of the pump body respectively. The moon-shaped oil return groove 23-1 is located at the thread of the head flange of the return oil sleeve 23, so that the upper and lower cavities of the flange are connected, so that the return oil of the pump body 21 can be directly drained back to the bottom of the oil barrel through the channel between the pump pipe 24 and the return oil sleeve 23.

[0034] A sealed chamber, namely an oil pressure chamber 31, is formed between the plunger 25, the tie rod 17 and the pump pipe 24. The lower part of the oil pressure chamber 31 is isolated from the oil suction hole 29 by the precise fit between the outer cylindrical surface of the plunger 25 and the piston hole of the pump cylinder 28. The upper part of the sealed chamber is isolated from the transmission chamber inside the upper box body by the motion seal formed by the tie rod 17 and the combined sealing ring 18. The pump body 21 is connected to the oil outlet 7 and the oil inlet hole of the overflow valve 19 and the oil pressure chamber 31 through the oil outlet flow channel hole.

[0035] A barrel cover 8 is fixedly installed on the lower plane of the pump body 21. A through hole slightly larger than the head flange of the return oil sleeve 23 is provided in the middle of the barrel cover 8 for the return oil sleeve 23 to pass through. Two chains 9 are provided between the barrel cover 8 and the oil pressure plate 10. A laser ranging liquid level sensor 32 is fixed on the upper part of the barrel cover 8. The emitted laser beam directly irradiates the upper plane of the oil pressure plate 10. The laser ranging liquid level sensor 32 is connected to an external display and controller. The laser ranging liquid level sensor 32 displays the measured distance value through the display and transmits it to the controller. The oil pressure plate 10 is guided by the return oil sleeve 23 and moves with the oil level in the barrel. It is always close to the grease in the barrel, preventing the lubrication pump from being sucked empty due to air mixing with the grease. There is no grease residue on the wall of the oil barrel. When the grease in the oil barrel is used up and a new oil barrel is replaced, the oil pressure plate can be pulled out of the oil barrel together with the entire pump. The laser ranging liquid level sensor 32 can provide real-time feedback on the grease storage in the barrel, and has good reliability.

[0036] Working principle: When the lubrication pump is working, the motor 1 is powered on and rotates, and the eccentric shaft 14 is driven to rotate after being reduced by the worm 3 and the worm wheel 4. The eccentric shaft 14 converts the rotation into up and down reciprocating motion through the eccentric shaft of the head and the copper sliding sleeve 15 and the slider 16, driving the pull rod 17 and the plunger 25 connected to the slider 16 to reciprocate up and down synchronously.

[0037] The head of the plunger 25 is inserted into the piston cavity in the middle of the pump cylinder 28. When the plunger 25 moves upward from the lowest point, the control piston 27 inside the pile plug 25 moves downward under the pre-pressure of the spring 26, and the control piston 27 head closes the oil outlet 30, forming a vacuum cavity between the plunger 25 head and the pump cylinder 28. When the plunger 25 moves to the highest point, the lower end of the plunger 25 moves to the top of the oil suction hole 29, and the vacuum cavity just formed is connected to the grease in the oil barrel through the oil suction hole 29. Under the action of the vacuum force, the grease in the oil barrel is sucked in and fills the vacuum cavity just formed. The diameter D2 of the plunger 25 head = the diameter D1 of the pull rod 17 head, so the volume of the oil pressure cavity 31 does not change during this process, and the lubrication pump completes the oil suction process.

[0038] The plunger 25 moves downward from the highest point. When the plunger 25 moves to the lowest end to close the oil suction hole 29, a closed cavity is formed between the head of the plunger 25 and the pump cylinder 28. The cavity is filled with the grease just sucked in. The plunger 25 continues to move downward, and the volume of the closed cavity decreases. The grease in the cavity moves upward through the through hole in the middle of the plunger 25, pushing the control piston 27 to move upward. When the head of the control piston 27 moves to above the oil outlet hole 30, the closed cavity is connected to the oil pressure chamber 31 through the oil outlet hole 30. The grease in the cavity is continuously pressed into the oil pressure chamber 31 by the plunger 25 and is finally transported out from the oil outlet 7. When the plunger 25 moves to the lowest point, the lubrication pump finishes discharging oil.

[0039] As long as the motor 1 is running, the plunger 25 will continue to reciprocate up and down, and the lubrication pump will continue the above-mentioned oil suction and discharge process to pressurize the grease in the oil barrel and supply it out. The pressure gauge 5 installed on the pump body 21 is connected to the oil outlet 7 to display the oil supply pressure of the lubrication pump in real time. The oil inlet of the relief valve 19 is connected to the oil outlet 7, and the return oil is connected to the return oil channel between the return oil sleeve 23 and the pump pipe 24 through the return oil flow channel hole inside the pump body 21. The relief valve 19 can preset the opening pressure value according to the system requirements. When the outlet pressure of the lubrication pump exceeds the set opening pressure value of the relief valve, the valve core in the relief valve is pushed open by the high-pressure grease, and the excess grease flows back to the bottom of the oil barrel through the internal channel, which effectively prevents the electric lubrication pump from causing damage to system components or causing damage to internal components of the lubrication pump due to overpressure operation.

[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An electric barrel lubrication pump, comprising a motor, a reduction mechanism, a pump body, a pull rod, a pump pipe, an oil return sleeve and a barrel cover, wherein the reduction mechanism comprises a worm gear and a worm, and the oil return sleeve is provided with an oil pressure plate on its outer sleeve and is placed in an oil barrel as a whole, characterized in that: The oil return sleeve is sleeved on the periphery of the pump pipe, the inner hole of the oil pressure plate cooperates with the outer circle of the oil return sleeve, a sealing ring is provided between the outer ring of the oil pressure plate and the oil barrel, four crescent-shaped oil return grooves are provided at the thread of the head flange of the oil return sleeve, and a laser ranging liquid level sensor is provided on the barrel cover.

2. The electric barrel lubrication pump according to claim 1, characterized in that: The motor is located at the top of the box body, the worm and worm wheel are installed in the box body, the worm head is connected to the motor, the worm wheel and the eccentric shaft end head are fixed, the eccentric shaft passes through the bearing inner holes of the large bearing and the small bearing installed on the box body, and is fixed with a shaft retaining ring, the eccentric shaft of the eccentric shaft is provided with a copper sleeve, and the sleeve outer shell is provided with a slider.

3. The electric barrel lubrication pump according to claim 2, characterized in that: The lower part of the box body is connected and fixed to the pump body, and the pump body is provided with a pressure gauge, a relief valve, an oil return port, and an oil outlet. A through hole with a sealing groove is provided inside the pump body, and the pull rod head and the slider are connected and fixed. The rod body of the pull rod passes through the through hole of the pump body, the combined sealing ring, the sealing positioning sleeve, and the inner cavity of the pump pipe in sequence and is connected to the plunger. The outer ring of the combined sealing ring forms a static seal with the sealing groove of the pump body, and the inner ring forms a dynamic seal with the rod body of the pull rod.

4. The electric barrel lubrication pump according to claim 3, characterized in that: A small piston cavity is provided inside the plunger, and a control piston is installed in the cavity. An oil outlet hole is also provided on the circumference of the plunger, and the oil outlet hole is connected to the internal small piston cavity. A spring is installed between the upper positioning boss of the control piston and the bottom positioning boss of the pull rod. A pump cylinder is provided at the lower part of the plunger, and a piston cavity and an oil suction hole cooperating with the plunger are provided in the middle part of the pump cylinder. One end of the oil suction hole is connected to the piston cavity and the other end is connected to external grease. A thread is provided on the upper outer circle of the pump cylinder.

5. The electric barrel lubrication pump according to claim 4, characterized in that: The lower part of the through hole with a sealing groove inside the pump body is a threaded hole, the pump pipe head is threaded into the threaded hole and pressed and sealed with the upper sealing positioning sleeve, and the threads of the pump pipe bottom and the pump cylinder are tightened and sealed.

6. The electric barrel lubrication pump according to claim 1, characterized in that: The head flange of the oil return sleeve is provided with threads, which are fixed to the outside of the pump pipe through the threads, are coaxial with the pump pipe, and have an oil-passing annular gap in the middle; an O-ring groove is provided on the top of the oil return sleeve flange, and an O-ring is installed in the O-ring groove to form a seal with the pump body; two communicating oil return flow channel holes are provided between the lower part of the pump body and the inner cavity of the O-ring groove, which are connected to the oil return chamber of the overflow valve and the oil return port of the pump body respectively; the moon-shaped oil return groove is located at the thread of the head flange of the oil return sleeve.

7. The electric barrel lubrication pump according to claim 4, characterized in that: A sealed chamber, namely an oil pressure chamber, is formed between the plunger, the pull rod and the pump pipe. The lower part of the oil pressure chamber is isolated from the oil suction hole by the precise fit between the outer cylindrical surface of the plunger and the piston hole of the pump cylinder. The upper part of the sealed chamber is isolated from the transmission chamber inside the upper box body by the motion seal formed by the pull rod and the combined sealing ring. The pump body is connected to the oil outlet and the oil inlet hole of the overflow valve through the oil outlet flow channel hole.

8. The electric barrel lubrication pump according to claim 1, characterized in that: A barrel cover is fixedly mounted on the lower plane of the pump body, and a through hole slightly larger than the flange of the oil return sleeve head is provided in the middle of the barrel cover for the oil return sleeve to pass through.

9. The electric barrel lubrication pump according to claim 1, characterized in that: Two chains are arranged between the barrel cover and the oil pressure plate. The laser ranging type liquid level sensor is fixed on the upper part of the barrel cover, and the emitted laser beam is directly irradiated on the upper plane of the oil pressure plate.

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