Concentrated grease injection device

Abstract

The utility model relates to a centralized grease injection device which comprises a grease injection cylinder, a grease injection valve for injecting lubricating grease to a grease lubrication point and a pumping mechanism for sucking the lubricating grease from the grease injection cylinder and outputting the lubricating grease to the grease injection valve, the grease injection cylinder comprises a cylinder body, a cylinder cover, an oil pressing disc assembly and a pull rope displacement sensor, and the cylinder cover is fixed at the open end of the cylinder body and seals the cylinder body. The oil pressing disc assembly comprises an oil pressing disc, a guide rod and a compression spring, the guide rod is sleeved with the oil pressing disc and the compression spring, the oil pressing disc is in sliding fit with the guide rod, the two ends of the guide rod are fixed to the barrel cover and the closed end of the barrel respectively, the oil pressing disc is in sliding fit with the inner wall of the barrel, and the two ends of the compression spring abut against the barrel cover and the oil pressing disc respectively. The cavity where the compression spring is located is an air cavity, the other cavity is a grease cavity, a grease outlet is formed in the closed end of the barrel, a main body of the pull rope displacement sensor is installed on the outer side of the barrel cover, and the pull rope penetrates through the barrel cover to be connected to the oil pressing disc. The grease injection device is compact in structure, small in size and accurate and controllable in grease injection amount and time.

Description

Technical Field

[0001] The utility model relates to a centralized grease injection device which can be used for automatically injecting grease into a plurality of grease lubrication points inside mechanical equipment. Background Art

[0002] When the coal mining machine is working underground, the friction between the equipment parts is very large, and abnormal noise and high-temperature wear are likely to occur during use. Therefore, grease needs to be added to cool and lubricate.

[0003] At present, underground grease injection is often done manually, which is not only time-consuming and labor-intensive, but also has many other disadvantages: (1) The amount of grease added cannot be accurately controlled. Manual grease injection can only be based on experience, and the amount of grease injected and the time of grease injection vary from person to person; (2) There are many lubrication points, and there is a possibility of manual omission; (3) Secondary contamination during grease injection. Due to long-term exposure, the grease injection joints will be adhered with a lot of impurities such as coal dust. The impurities enter the lubrication parts through the grease injection joints, causing increased wear of parts and shortening the life of the equipment; (4) Most grease injection cylinders do not have a grease quantity detection mechanism. The few grease cylinders that have a grease quantity detection mechanism mostly use analog detection methods such as floats or ultrasound, which have large measurement errors and low sensitivity. They cannot achieve accurate control of the oil quantity. In addition, they are not easy to install and are prone to oil leakage, affecting their use. Utility Model Content

[0004] The utility model provides a centralized grease injection device, which is used for automatic grease injection, has high grease injection efficiency, and can precisely control the grease injection amount and time, thereby preventing the lubrication points from being missed and impurities from entering the lubrication parts.

[0005] The main technical solutions of the utility model are:

[0006] A centralized grease injection device comprises a grease injection cylinder, a grease injection valve for injecting grease into a grease lubrication point, and a pumping mechanism for sucking grease from the grease injection cylinder and outputting grease to the grease injection valve. The grease injection cylinder comprises a cylinder body, a cylinder cover, an oil pressure plate assembly and a pull-rope displacement sensor. The cylinder cover is fixed to the open end of the cylinder body and closes the cylinder body. The oil pressure plate assembly comprises an oil pressure plate, a guide rod and a compression spring. The oil pressure plate and the compression spring are both sleeved on the guide rod. The oil pressure plate and the guide rod are slidably matched. The two ends of the guide rod are respectively fixed on the cylinder cover and the closed end of the cylinder body. The oil pressure plate and the inner wall of the cylinder are slidably matched. The two ends of the compression spring are respectively against the cylinder cover and the oil pressure plate. The oil pressure plate divides the inner cavity of the cylinder into two cavities. The cavity where the compression spring is located is an air cavity, and the other cavity is a grease cavity. A grease outlet is provided on the closed end of the cylinder body. The main body of the pull-rope displacement sensor is installed on the outside of the cylinder cover. The pull rope passes through the cylinder cover and is connected to the oil pressure plate.

[0007] There are two grease outlets, and the pumping mechanism includes a left oil cylinder, a right oil cylinder and an intermediate valve cavity connecting the left and right oil cylinders. The inner diameter of the intermediate valve cavity is smaller than the inner diameters of the left and right oil cylinders. The left oil cylinder, the right oil cylinder and the intermediate valve cavity are respectively provided with a left plunger, a right plunger and a reversing valve core. The left plunger, the right plunger and the reversing valve core are respectively slidably matched with the left oil cylinder, the right oil cylinder and the intermediate valve cavity and they are connected together in sequence. The left end cavity wall of the left oil cylinder and the right end cavity wall of the right oil cylinder are respectively provided with a first driving oil inlet and a second driving oil inlet and a second driving oil inlet. The cylindrical cavity wall of the left oil cylinder near the right end and the cylindrical cavity wall of the right oil cylinder near the left end are The first grease suction port and the second grease suction port are respectively provided on the cylindrical cavity wall at the two ends, the first grease supply port and the second grease supply port are respectively provided on the right end cavity wall of the left oil cylinder and the left end cavity wall of the right oil cylinder, the two grease outlets are connected one-to-one with the first and second grease suction ports, when the left plunger is located at the left end of the left oil cylinder, the right plunger is simultaneously located at the left end of the right oil cylinder, the first grease suction port is communicated with the first grease supply port, and the second grease suction port is not communicated with the second grease supply port, when the right plunger is located at the right end of the right oil cylinder, the left plunger is simultaneously located at the right end of the left oil cylinder, the second grease suction port is communicated with the second grease supply port, and the first grease suction port is not communicated with the first grease supply port.

[0008] The grease injection valve comprises a reversing valve and a metering valve. The valve core of the metering valve divides the valve cavity of the metering valve into a first grease cavity and a second grease cavity. The metering valve is provided with a first grease inlet and a second grease inlet that are normally open. The first grease inlet and the second grease inlet are communicated with the first grease cavity and the second grease cavity, respectively. The reversing valve is provided with a first inlet, a second inlet, a first inlet and a second inlet, a first outlet and a second outlet. The first and second inlets are respectively arranged on the cavity walls at both ends of the valve cavity of the reversing valve. The first inlet and the first outlet are arranged on the cylindrical cavity wall of the valve cavity of the reversing valve near the first inlet. The second inlet and the second outlet are arranged on the cylindrical cavity wall of the valve cavity of the reversing valve near the second inlet. The first grease supply port and the second grease supply port are respectively connected to the first and second inlets. The first and second grease inlet and the second inlet are respectively connected to the first and second inlets. When the valve core of the reversing valve is located at one end of the valve cavity near the first inlet, the first inlet and the first outlet are communicated with the second outlet, and the second inlet and the second outlet are not communicated with the first outlet. When the valve core of the reversing valve is located at one end of the valve cavity near the second inlet, the second inlet and the second outlet are communicated with the second outlet, and the first inlet and the first outlet are not communicated with the first outlet.

[0009] There are preferably multiple grease injection valves, and the first inlets, second inlets, first outlets, and second outlets of the reversing valves in each grease injection valve are connected in parallel.

[0010] The first and second air release valves are installed on the valve body of the grease injection valve. The first and second grease supply channels respectively connected to the two grease supply ports and the first and second inlets are provided in the valve body of the grease injection valve. The inlets of the first and second air release valves are communicated with the first and second grease supply channels respectively.

[0011] A plurality of the grease injection valves are usually integrated on the same valve body.

[0012] The oil pressure plate assembly also includes a guide sleeve, which is fixed on the oil pressure plate, and the oil pressure plate is slidably matched with the guide rod through the guide sleeve.

[0013] The centralized grease injection device may further include a grease overflow valve, which is a one-way valve. The grease overflow valve is installed on the side wall of the grease injection cylinder, and the grease cavity of the grease injection cylinder is connected to the inlet of the one-way valve.

[0014] A sealing ring is arranged on the cylindrical surface of the oil pressure plate and the inner wall of the cylinder in sliding cooperation.

[0015] The cross-sectional shape of the cylinder is preferably a rounded rectangle.

[0016] The beneficial effects of the utility model are:

[0017] The centralized grease injection device of the utility model has high integration, small size and high protection level, and is suitable for equipment with limited accessory installation space and harsh working environment, such as coal mining machines.

[0018] The grease in the grease injection cylinder is transported to each grease injection valve by using a hydraulic oil-driven pumping mechanism, and finally distributed to each grease lubrication point. No motor drive is required. It can be achieved by utilizing the existing hydraulic station of the equipment to be lubricated and adding an electromagnetic reversing valve, and the grease injection frequency is easy to control.

[0019] Since the quantitative valve is included, the amount of grease injected by the grease injection valve at a single time can be precisely controlled.

[0020] The grease in the grease cylinder is fixed by the oil pressure plate assembly, and the centralized grease injection device can be installed in any direction and position.

[0021] The use of a pull-wire displacement sensor to detect the amount of grease in the grease injection cylinder is not affected by the installation angle and position of the centralized grease injection device, thereby ensuring the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the centralized grease injection device;

[0023] Figure 2 This is an appearance diagram of an embodiment of the centralized grease injection device;

[0024] Figure 3 It is a structural schematic diagram of an embodiment of the grease injection cylinder.

[0025] Reference numerals:

[0026] 1. Grease injection cylinder; 11. Cylinder body; 12. Cylinder cover; 13. Oil pressure plate; 14. Guide rod; 15. Compression spring; 16. Guide sleeve;

[0027] 2. Double hydraulic reversing valve; 21. First grease suction port; 22. Second grease suction port; 23. First grease supply port; 24. Second grease supply port; 25. First drive oil inlet and outlet; 26. Second drive oil inlet and outlet; 27. Reversing valve core; 28. Left plunger; 29. ​​Right plunger;

[0028] 3. Reversing valve; 31. First inlet; 32. Second inlet; 33. First inlet and outlet; 34. Second inlet and outlet; 35. First outlet; 36. Second outlet; 37. Reversing valve core;

[0029] 4. Dosing valve; 41. Dosing valve core; 42. First grease inlet and outlet; 43. Second grease inlet and outlet;

[0030] 5. Grease overflow valve;

[0031] 6. Air release valve;

[0032] 7. Draw rope displacement sensor; 71. Steel wire rope. DETAILED DESCRIPTION

[0033] like Figure 1 , 2 As shown in Figures 3 and 4, the utility model discloses a centralized grease injection device, comprising a grease injection cylinder 1, a grease injection valve for injecting grease into a grease lubrication point, and a pumping mechanism 2 for sucking grease from the grease injection cylinder and outputting grease to the grease injection valve. The grease injection cylinder comprises a cylinder body 11, a cylinder cover 12, an oil pressure plate assembly, and a pull rope displacement sensor 7. The cylinder body is open at one end and closed at the other end, and the cylinder cover is fixed to the open end of the cylinder body and closes the cylinder body. The oil pressure plate assembly comprises an oil pressure plate 13, a guide rod 14, and a compression spring 15. The oil pressure plate and the compression spring are both sleeved on the guide rod, and the oil pressure plate and the guide rod are slidably matched. The two ends of the guide rod are respectively fixed on the cylinder cover and the closed end of the cylinder body. The oil pressure plate is slidably matched with the inner wall of the cylinder. The two ends of the compression spring are respectively against the cylinder cover and the oil pressure plate. The oil pressure plate divides the inner cavity of the cylinder into two cavities with variable volumes. The cavity where the compression spring is located is an air cavity, and the other cavity is a grease cavity. A grease outlet is provided on the closed end of the cylinder body. The main body of the pull rope displacement sensor is installed on the outside of the cylinder cover, and the steel wire pull rope 71 passes through the cylinder cover and is connected to the oil pressure plate. The grease filling method of the grease injection cylinder adopts an automatic grease filling method.

[0034] The compression spring remains in a compressed state. As the grease in the grease chamber decreases, the compression spring pushes the oil pressure plate toward the grease outlet to keep the grease chamber full. When the grease is added to the grease cylinder, the compression spring moves toward the cylinder cover under the pressure of the newly injected grease. Since the oil pressure plate assembly can always fix the grease in the grease cylinder, the grease cylinder can be installed in any direction and position.

[0035] The fixing points of the guide rod, the cylinder cover and the closed end of the cylinder body are respectively located at the center points of the cylinder cover and the closed end of the cylinder body.

[0036] During the movement of the oil pressure plate, the pull rope displacement sensor releases or retracts the wire rope. During this process, the pull rope displacement sensor collects information and outputs an analog signal in real time. The analog signal can be used to accurately and real-time display the amount of grease inside the grease injection cylinder through data conversion.

[0037] The pull-wire displacement sensor can sense the displacement of the oil pressure plate, and combined with the inner diameter of the grease injection cylinder, it can be converted into the change in grease, and the amount of grease in the grease injection cylinder can be indirectly measured. In addition, the pull-wire displacement sensor can be installed at any angle of the centralized grease injection device and can accurately output signals.

[0038] There are two grease outlets, and the pumping mechanism includes a left oil cylinder, a right oil cylinder and an intermediate valve cavity connecting the left and right oil cylinders, and the inner diameter of the intermediate valve cavity is smaller than the inner diameters of the left and right oil cylinders. A left plunger 28, a right plunger 29 and a reversing valve core 27 are respectively arranged in the left oil cylinder, the right oil cylinder and the intermediate valve cavity, and the left plunger, the right plunger and the reversing valve core are respectively slidably matched with the left oil cylinder, the right oil cylinder and the intermediate valve cavity, and they are sequentially connected together to move as a whole. A first driving oil inlet and outlet 25 and a second driving oil inlet and outlet 26 are respectively arranged on the left end cavity wall of the left oil cylinder and the right end cavity wall of the right oil cylinder, a first grease suction port 21 and a second grease suction port 22 are respectively arranged on the cylindrical cavity wall near the right end of the left oil cylinder and the cylindrical cavity wall near the left end of the right oil cylinder, and a first grease supply port 23 and a second grease supply port 24 are respectively arranged on the right end cavity wall of the left oil cylinder and the left end cavity wall of the right oil cylinder. The two grease outlets are connected one-to-one with the first and second grease suction ports. When the left plunger is located at the left end of the left oil cylinder, the right plunger is also located at the left end of the right oil cylinder, and the first liposuction port is communicated with the first liposuction port, and the second liposuction port is not communicated with the second liposuction port; when the right plunger is located at the right end of the right oil cylinder, the left plunger is also located at the right end of the left oil cylinder, and the second liposuction port is communicated with the second liposuction port, and the first liposuction port is not communicated with the first liposuction port.

[0039] The grease injection valve includes a reversing valve 3 and a metering valve 4. The metering valve core 41 divides the valve cavity of the metering valve into a first grease cavity and a second grease cavity. The metering valve is provided with a first grease inlet and outlet 42 and a second grease inlet and outlet 43 which are normally open. The first grease inlet and outlet are connected to the first grease cavity and the second grease cavity respectively. The reversing valve is provided with a first inlet 31, a second inlet 32, a first inlet and outlet 33, a second inlet and outlet 34, a first outlet 35 and a second outlet 36. The first and second inlets are respectively provided on the cavity walls at both ends of the reversing valve cavity. The first inlet and outlet and the first outlet are provided on the cylindrical cavity wall of the reversing valve cavity near the first inlet. The second inlet and outlet are provided on the cylindrical cavity wall of the reversing valve cavity near the second inlet. The first grease supply port and the second grease supply port are respectively connected to the first and second inlets. The first and second grease inlets and outlets are respectively connected to the first and second inlets. When the reversing valve core 37 is located at one end of the valve cavity near the first inlet, the first inlet and outlet are connected to the first outlet, and the second inlet and outlet are blocked from the second outlet; when the reversing valve core is located at one end of the valve cavity near the second inlet, the second inlet and outlet are connected to the second outlet, and the first inlet and outlet are blocked from the first outlet. The first and second inlets of the reversing valve are respectively constituted as the first and second inlets of the grease injection valve, and the first and second outlets of the reversing valve are respectively constituted as the first and second outlets of the grease injection valve.

[0040] The grease in the grease injection cylinder is transported to each grease injection valve by using a hydraulic oil-driven pumping mechanism, and finally distributed to each grease lubrication point. No motor drive is required. It can be achieved by utilizing the existing hydraulic station of the equipment to be lubricated and adding an electromagnetic reversing valve, and the grease injection frequency is easy to control.

[0041] Figure 1 The main working process of the centralized grease injection device shown is:

[0042] The first cycle (corresponding to Figure 1 State shown): The first drive oil inlet and outlet 25 enters the pressure oil, the left plunger 28, the reversing valve core 27, and the right plunger 29 move to the right, and the grease in the left oil cylinder of the pumping mechanism is output to the grease injection valve through the first grease supply port 23, and the right oil cylinder sucks grease from the grease injection cylinder through the second grease suction port 22. The grease entering the grease injection valve enters the reversing valve from the first inlet 31, pushes the reversing valve core 37 to move and reaches the end close to the second inlet 32. At this time, the second inlet and outlet 34 is connected to the second outlet 36, and the first inlet and outlet 33 is opened. The grease entering the reversing valve enters a valve cavity of the metering valve through the first inlet and outlet 33 and the first grease inlet and outlet 42, pushes the metering valve core 41 to move, and presses the grease in the other valve cavity of the metering valve through the second grease inlet and outlet 43 and the second inlet and outlet 34 into a valve cavity of the reversing valve, and then outputs it to the grease lubrication point through the second outlet 36.

[0043] Second cycle: The second drive oil inlet and outlet 26 enters the pressure oil, the left plunger 28, the reversing valve core 27, and the right plunger 29 move to the left, and the grease in the right oil cylinder of the pumping mechanism is output to the grease injection valve through the second grease supply port 24, and the left oil cylinder sucks grease from the grease injection cylinder through the first grease suction port 21. The grease entering the grease injection valve enters the reversing valve from the second inlet 32, pushes the reversing valve core 37 to move and reaches the end close to the first inlet 31. At this time, the first inlet and outlet 33 is connected to the first outlet 35, and the second inlet and outlet 34 is opened. The grease entering the reversing valve enters the other valve cavity of the metering valve through the second inlet and outlet 34 and the second grease inlet and outlet 43, pushes the metering valve core 41 to move, and presses the grease in one valve cavity of the metering valve into the other valve cavity of the reversing valve through the first grease inlet and outlet 42 and the first inlet and outlet 33, and then outputs it to the grease lubrication point through the first outlet 35.

[0044] By switching the electromagnetic reversing valve, the first drive oil inlet and outlet and the second drive oil inlet and outlet are alternately filled with oil, and the above two cycles are repeated, and the first outlet 35 and the second outlet 36 output lubricating grease alternately.

[0045] There are preferably multiple grease injection valves, and the first inlets, second inlets, first outlets, and second outlets of the reversing valves in each grease injection valve are connected in parallel.

[0046] The valve body of the grease injection valve is also equipped with a first and a second air release valve 6. The valve body of the grease injection valve is provided with a first and a second grease supply channel respectively connected to the two grease supply ports and the first and the second inlets. The inlets of the first and the second air release valves are communicated with the first and the second grease supply channels respectively. When the centralized grease injection device is used for the first time, the first and the second air release valves need to be opened to exhaust air.

[0047] When there are multiple grease injection valves, the multiple grease injection valves are preferably integrated on the same valve body.

[0048] The pumping mechanism and the grease injection valve can also share a valve body, so that the centralized grease injection device has a higher degree of integration and a smaller volume, and is more suitable for installation on equipment with limited accessory installation space such as coal mining machines.

[0049] The oil pressure plate assembly may further include a guide sleeve 16, which is fixed on the oil pressure plate, and the oil pressure plate is slidably matched with the guide rod through the guide sleeve. The guide sleeve can play a role in assisting the positioning of the oil pressure plate. The guide sleeve may be a copper guide sleeve.

[0050] The centralized grease injection device may further include a grease overflow valve 5, which is a one-way valve and is mounted on the side wall of the grease injection cylinder. The grease cavity of the grease injection cylinder is connected to the inlet of the one-way valve. When grease is added to the grease injection cylinder, when grease is discharged from the outlet of the grease overflow valve, it can be determined that the grease injection cylinder is full.

[0051] A dynamic seal is provided between the oil pressure plate and the inner wall of the cylinder, and a sealing ring is usually provided on the cylindrical surface where the oil pressure plate and the inner wall of the cylinder slide together.

[0052] The cross-sectional shape of the cylinder is preferably a rounded rectangle. The flat and thin structural feature of this shape makes it easier to find a suitable installation space for the grease injection cylinder on equipment such as coal mining machines, while making the corresponding space as fully utilized as possible.

[0053] The utility model can be used to automatically add grease to multiple grease lubrication points inside mechanical equipment, especially for large-scale mechanical equipment with harsh working environment, which can significantly improve the grease injection efficiency and quality, thereby improving the grease lubrication effect, and can also effectively avoid leakage and secondary pollution.

[0054] The terms "left and right" in this article are for the convenience of expression and are not a limitation of absolute directions.

Claims

1. A centralized grease injection device, characterized in that: The grease injection cylinder comprises a grease injection valve for injecting grease into a grease lubrication point, and a pumping mechanism for sucking grease from the grease injection cylinder and outputting grease to the grease injection valve. The grease injection cylinder comprises a cylinder body, a cylinder cover, an oil pressure plate assembly and a pull-rope displacement sensor. The cylinder cover is fixed to the open end of the cylinder body and closes the cylinder body. The oil pressure plate assembly comprises an oil pressure plate, a guide rod and a compression spring. The oil pressure plate and the compression spring are both sleeved on the guide rod. The oil pressure plate and the guide rod are slidably matched. The two ends of the guide rod are respectively fixed on the cylinder cover and the closed end of the cylinder body. The oil pressure plate and the inner wall of the cylinder body are slidably matched. The two ends of the compression spring are respectively against the cylinder cover and the oil pressure plate. The oil pressure plate divides the inner cavity of the cylinder into two cavities. The cavity where the compression spring is located is an air cavity, and the other cavity is a grease cavity. A grease outlet is provided on the closed end of the cylinder body. The main body of the pull-rope displacement sensor is installed on the outside of the cylinder cover. The pull rope passes through the cylinder cover and is connected to the oil pressure plate.

2. The centralized grease injection device according to claim 1, characterized in that: There are two grease outlets, and the pumping mechanism includes a left oil cylinder, a right oil cylinder and an intermediate valve cavity connecting the left and right oil cylinders. The inner diameter of the intermediate valve cavity is smaller than the inner diameters of the left and right oil cylinders. The left oil cylinder, the right oil cylinder and the intermediate valve cavity are respectively provided with a left plunger, a right plunger and a reversing valve core. The left plunger, the right plunger and the reversing valve core are respectively slidably matched with the left oil cylinder, the right oil cylinder and the intermediate valve cavity and they are connected together in sequence. The left end cavity wall of the left oil cylinder and the right end cavity wall of the right oil cylinder are respectively provided with a first driving oil inlet and a second driving oil inlet and a second driving oil inlet. The cylindrical cavity wall of the left oil cylinder near the right end and the cylindrical cavity wall of the right oil cylinder near the left end are The first grease suction port and the second grease suction port are respectively provided on the cylindrical cavity wall at the two ends, the first grease supply port and the second grease supply port are respectively provided on the right end cavity wall of the left oil cylinder and the left end cavity wall of the right oil cylinder, the two grease outlets are connected one-to-one with the first and second grease suction ports, when the left plunger is located at the left end of the left oil cylinder, the right plunger is simultaneously located at the left end of the right oil cylinder, the first grease suction port is communicated with the first grease supply port, and the second grease suction port is not communicated with the second grease supply port, when the right plunger is located at the right end of the right oil cylinder, the left plunger is simultaneously located at the right end of the left oil cylinder, the second grease suction port is communicated with the second grease supply port, and the first grease suction port is not communicated with the first grease supply port.

3. The centralized grease injection device according to claim 2, characterized in that: The grease injection valve comprises a reversing valve and a metering valve. The valve core of the metering valve divides the valve cavity of the metering valve into a first grease cavity and a second grease cavity. The metering valve is provided with a first grease inlet and a second grease inlet that are normally open. The first grease inlet and the second grease inlet are communicated with the first grease cavity and the second grease cavity, respectively. The reversing valve is provided with a first inlet, a second inlet, a first inlet and a second inlet, a first outlet and a second outlet. The first and second inlets are respectively arranged on the cavity walls at both ends of the valve cavity of the reversing valve. The first inlet and the first outlet are arranged on the cylindrical cavity wall of the valve cavity of the reversing valve near the first inlet. The second inlet and the second outlet are arranged on the cylindrical cavity wall of the valve cavity of the reversing valve near the second inlet. The first grease supply port and the second grease supply port are respectively connected to the first and second inlets. The first and second grease inlet and the second inlet are respectively connected to the first and second inlets. When the valve core of the reversing valve is located at one end of the valve cavity near the first inlet, the first inlet and the first outlet are communicated with the second outlet, and the second inlet and the second outlet are not communicated with the first outlet. When the valve core of the reversing valve is located at one end of the valve cavity near the second inlet, the second inlet and the second outlet are communicated with the second outlet, and the first inlet and the first outlet are not communicated with the first outlet.

4. The centralized grease injection device according to claim 3, characterized in that: There are multiple grease injection valves, and the first inlets of the reversing valves in each grease injection valve are connected in parallel, the second inlets are connected in parallel, the first outlets are connected in parallel, and the second outlets are connected in parallel.

5. The centralized grease injection device according to claim 3, characterized in that: The first and second air release valves are installed on the valve body of the grease injection valve. The first and second grease supply channels respectively connected to the two grease supply ports and the first and second inlets are provided in the valve body of the grease injection valve. The inlets of the first and second air release valves are communicated with the first and second grease supply channels respectively.

6. The centralized grease injection device according to claim 3, characterized in that: A plurality of grease injection valves are integrated on the same valve body.

7. The centralized grease injection device according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The oil pressure plate assembly also includes a guide sleeve, which is fixed on the oil pressure plate, and the oil pressure plate is slidably matched with the guide rod through the guide sleeve.

8. The centralized grease injection device according to claim 7, characterized in that: It also includes a grease overflow valve, which is a one-way valve. The grease overflow valve is installed on the side wall of the grease injection cylinder, and the grease cavity of the grease injection cylinder is communicated with the inlet of the one-way valve.

9. The centralized grease injection device according to claim 7, characterized in that: A sealing ring is arranged on the cylindrical surface of the oil pressure plate and the inner wall of the cylinder in sliding cooperation.

10. The centralized grease injection device according to claim 7, characterized in that: The cross-sectional shape of the cylinder is a rounded rectangle.

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