Inverted reverse force output type gas-liquid pressure cylinder
By setting up an oil storage chamber in the pre-pressure assembly of the gas-liquid booster cylinder and placing it above the booster chamber, the problem that the existing cylinder cannot be installed inverted is solved, and the smooth output operation and sufficient pressure after inverting is achieved.
Patent Information
- Application Number
- CN202421992742.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The existing ordinary gas-liquid supercharged cylinder cannot be installed inverted, resulting in the inability to remove the bubbles in the cylinder, the output movement is not smooth, the pressure is insufficient or the overall height is too high, and it cannot be used in the case of limited longitudinal height.
A flip-flop reverse output gas-liquid supercharge cylinder is designed. By setting an oil storage chamber in the pre-pressure assembly and placing it above the supercharge chamber, it ensures that the oil level in the oil storage chamber remains horizontal at all times during flip-flop, which is conducive to the discharge of internal gas.
It achieves smooth force output movement and sufficient pressure after inverting, and can be used when the longitudinal height is limited, solving the problem of excessive inverting the overall height.
Smart Images
Figure CN222950145U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of booster cylinders, in particular to an inverted reverse output type gas-liquid booster cylinder. Background Art
[0002] Cylinders are widely used in the automotive, electronics, printing, textile, medical machinery and other industries. The working principle of the cylinder is to convert the pressure energy of compressed air into mechanical energy, and use the pressure difference on both sides of the piston to push the piston rod to move, thereby driving the object connected to the piston rod to move. The existing ordinary gas-liquid booster cylinder cannot be installed upside down. When it is directly installed upside down, the bubbles in the cylinder cannot be eliminated, the inverted output action is not smooth, there is no pressure, or the overall inverted height is too high, and it cannot be used in the case of limited vertical height. Utility Model Content
[0003] In order to solve the above problems, the utility model provides an inverted reverse output type gas-liquid booster cylinder, which solves the situation where a larger output is required and the inverted installation and reverse output are required, the longitudinal installation space is limited, and an inverted reverse output type gas-liquid booster cylinder product is needed.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is to provide an inverted reverse output type gas-liquid booster cylinder, including a pre-pressurization component, a booster component and an oil pressure gauge installed on the pre-pressurization component, a front rod and a front piston installed on the pre-pressurization component, and a booster rod and a booster piston installed on the booster component, the pre-pressurization component is provided with an oil storage chamber, the booster component is provided with a booster chamber, the oil storage chamber is located above the booster chamber, the pre-pressurization component is communicated with the booster component, the front piston is installed at one end of the front rod, the booster piston is installed at one end of the booster rod, the pre-pressurization component is provided with a pre-pressurization air inlet and a pre-pressurization return air port, the booster component is provided with a booster air inlet and a booster return air port, the pre-pressurization air inlet is located above the front piston, the pre-pressurization return air port is located below the front piston, the booster air inlet is located above the booster piston, and the booster return air port is located below the booster piston.
[0005] As a preferred embodiment, the pre-stressing assembly includes an oil storage cylinder, an iron cylinder, a pre-stressing front cover, a pre-stressing rear cover and an intermediate body, one end of the front rod passes through the pre-stressing front cover, the oil storage cylinder and the intermediate body in sequence and extends into the iron cylinder, the front piston is located in the iron cylinder, one end of the oil storage cylinder is installed on the intermediate body, the other end of the oil storage cylinder is installed on the pre-stressing front cover, one end of the iron cylinder is installed on the intermediate body, the other end of the iron cylinder is installed on the pre-stressing rear cover, the pre-stressing air inlet is arranged on the pre-stressing front cover, the pre-stressing return air port is arranged on the pre-stressing rear cover, and the intermediate body is connected to the boosting assembly.
[0006] As a preferred embodiment, the iron cylinder barrel is provided with an iron cylinder chamber, the oil storage chamber is opened inside the oil storage barrel, the pre-compression air inlet is connected with the oil storage chamber, the pre-compression return air port is connected with the iron cylinder chamber, and the front piston is located in the iron cylinder chamber.
[0007] As a preferred embodiment, it also includes a plurality of first tie rod nuts, the pre-stressing front cover has a plurality of first connecting columns arranged at intervals, one end of the first connecting column passes through the intermediate body and the pre-stressing rear cover in sequence, the plurality of first tie rod nuts are matched with the plurality of first connecting columns one by one, and the first tie rod nut is installed on one end of the first connecting column.
[0008] As a preferred embodiment, the boost assembly includes a boost front cover, a boost rear cover, a high pressure head installed on the boost front cover, and a boost cylinder, one end of the boost cylinder is installed on the boost front cover, the other end of the boost cylinder is installed on the boost rear cover, the boost air inlet is arranged on the boost rear cover, the boost return air port is arranged on the boost front cover, the boost piston is located in the boost cylinder, one end of the boost rod is installed on the boost piston, the other end of the boost rod is slidably installed on the boost front cover, and the boost chamber is opened inside the high pressure head.
[0009] As a preferred solution, the boost cylinder is provided with a cylinder chamber, the boost piston is located in the cylinder chamber, and the boost air inlet and the boost return air inlet are both connected to the cylinder chamber.
[0010] As a preferred solution, it also includes multiple second tie rod nuts, the supercharged front cover has multiple second connecting columns arranged at intervals, one end of the second connecting column passes through the supercharged rear cover, multiple second tie rod nuts are matched with multiple second connecting columns one by one, and the second tie rod nut is installed on one end of the second connecting column.
[0011] As a preferred solution, the boost front cover is provided with a boost slide groove, an upper second oil hole, and a lower second oil hole. The upper second oil hole and the lower second oil hole are both connected to the boost slide groove. One end of the boost slide groove is connected to the cylinder chamber, and the other end of the boost slide groove is connected to the boost chamber. One end of the boost rod is slidably installed on the boost slide groove.
[0012] As a preferred scheme, the intermediate body is provided with a middle slide groove, an upper first oil hole, a lower first oil hole, an oil pressure hole and a middle oil inlet hole. The upper first oil hole, the lower first oil hole and the oil pressure hole are all connected with the slide groove, one end of the upper first oil hole is connected with the upper second oil hole, the other end of the upper first oil hole is connected with the middle oil inlet hole, the lower first oil hole is connected with the lower second oil hole, one end of the middle slide groove is connected with the oil storage chamber, the other end of the middle slide groove is connected with the iron cylinder chamber, one end of the front rod is slidably mounted on the middle slide groove, and one end of the oil pressure gauge is mounted on the oil pressure hole.
[0013] As a preferred embodiment, the middle slide groove includes a first middle slide groove and a second middle slide groove, the first middle slide groove is connected with the second middle slide groove, the diameter of the first middle slide groove is smaller than the diameter of the second middle slide groove, the first middle slide groove is respectively connected with the upper first oil hole and the oil storage chamber, and the lower first oil hole and the oil pressure hole are both connected with the second middle slide groove.
[0014] The beneficial effects of the utility model are as follows: by arranging the oil storage chamber above the boosting chamber, when the boosting cylinder is inverted, the oil level in the oil storage chamber is always kept in a horizontal upward state, which is beneficial to the discharge of excess internal gas, ensuring smooth output action and sufficient pressure after the boosting cylinder is inverted, and when the overall inverted height is too high, it can be used under conditions of limited longitudinal height. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model is a schematic diagram of the overall structure of an inverted reverse output type gas-liquid booster cylinder.
[0016] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of an inverted reverse-output gas-liquid booster cylinder.
[0017] Figure 3 for Figure 1 A schematic structural diagram of a pre-pressurization component in an inverted reverse-output gas-liquid booster cylinder.
[0018] Figure 4 for Figure 3 Schematic diagram of the cross-section structure of the preload component Figure 1 .
[0019] Figure 5 for Figure 3 Schematic diagram of the cross-section structure of the preload component Figure 2 .
[0020] Figure 6 for Figure 3 Schematic diagram of the structure of the intermediate in the pre-pressing component Figure 1 .
[0021] Figure 7 for Figure 3 Schematic diagram of the structure of the intermediate in the pre-pressing component Figure 2 .
[0022] Figure 8 for Figure 1 A schematic structural diagram of a boosting component in an inverted reverse-output gas-liquid boosting cylinder.
[0023] Fig. 9 for Figure 8 Schematic diagram of the cross-section structure of the booster assembly Figure 1 .
[0024] Fig.10 for Figure 8 Schematic diagram of the cross-section structure of the booster assembly Figure 2 .
[0025] Fig.11 for Figure 8 Schematic diagram of the structure of the supercharger front cover in the supercharger assembly.
[0026] Description of the accompanying drawings: 100, pre-pressing assembly; 110, front rod; 120, front piston; 130, oil storage cylinder; 131, oil storage chamber; 140, iron cylinder; 141, iron cylinder chamber; 150, pre-pressing front cover; 151, pre-pressing air inlet; 152, first connecting column; 160, pre-pressing rear cover; 161, pre-pressing return air port; 170, intermediate body; 171, middle slide; 172, upper first oil hole; 173, lower first oil hole; 174, oil pressure hole; 175, intermediate oil inlet hole; 180. First tie rod nut; 200. Boost assembly; 210. Boost rod; 220. Boost piston; 230. Boost front cover; 231. Boost return air port; 232. Second connecting column; 233. Boost slide; 234. Upper second oil hole; 235. Lower second oil hole; 240. Boost rear cover; 241. Boost air inlet; 250. High pressure head; 251. Boost chamber; 260. Boost cylinder; 261. Cylinder chamber; 270. Second tie rod nut; 300. Oil pressure gauge. DETAILED DESCRIPTION
[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0030] like Figures 1 to 11 As shown, the utility model provides an inverted reverse output type gas-liquid booster cylinder, comprising a pre-pressurization component 100, a booster component 200 and an oil pressure gauge 300 installed on the pre-pressurization component 100, a front rod 110 and a front piston 120 installed on the pre-pressurization component 100, and a booster rod 210 and a booster piston 220 installed on the booster component 200, the pre-pressurization component 100 is provided with an oil storage chamber 131, the booster component 200 is provided with a booster chamber 251, the oil storage chamber 131 is located above the booster chamber 251, the pre-pressurization component 100 and the booster component 200 The front piston 120 is installed at one end of the front rod 110, and the boost piston 220 is installed at one end of the boost rod 210. The pre-pressurization assembly 100 is provided with a pre-pressurization air inlet 151 and a pre-pressurization return air port 161, and the boost assembly 200 is provided with a boost air inlet 241 and a boost return air port 231. The pre-pressurization air inlet 151 is located above the front piston 120, and the pre-pressurization return air port 161 is located below the front piston 120. The boost air inlet 241 is located above the boost piston 220, and the boost return air port 231 is located below the boost piston 220. By arranging the oil storage chamber 131 above the boosting chamber 251, when the boosting cylinder is inverted, the oil level in the oil storage chamber 131 is always kept in a horizontal upward state, which is conducive to the discharge of excess internal gas, ensuring smooth output action and sufficient pressure after the boosting cylinder is inverted, and when the overall inverted height is too high, it can be used under conditions of limited longitudinal height.
[0031] The pre-stressing assembly 100 includes an oil storage cylinder 130, an iron cylinder 140, a pre-stressing front cover 150, a pre-stressing rear cover 160 and an intermediate body 170. One end of the front rod 110 passes through the pre-stressing front cover 150, the oil storage cylinder 130 and the intermediate body 170 in sequence and extends into the iron cylinder 140. The front piston 120 is located in the iron cylinder 140. One end of the oil storage cylinder 130 is installed on the intermediate body 170, and the other end of the oil storage cylinder 130 is installed on the pre-stressing front cover 150. One end of the iron cylinder 140 is installed on the intermediate body 170, and the other end of the iron cylinder 140 is installed on the pre-stressing rear cover 160. A pre-stressing air inlet 151 is opened on the pre-stressing front cover 150, and a pre-stressing return air port 161 is opened on the pre-stressing rear cover 160. The intermediate body 170 is connected to the boosting assembly 200. The iron cylinder barrel 140 is provided with an iron cylinder chamber 141 , the oil storage chamber 131 is opened inside the oil storage barrel 130 , the pre-compression air inlet 151 is connected with the oil storage chamber 131 , the pre-compression return air port 161 is connected with the iron cylinder chamber 141 , and the front piston 120 is located in the iron cylinder chamber 141 .
[0032] It also includes a plurality of first tie rod nuts 180, the pre-stressing front cover 150 has a plurality of first connecting columns 152 arranged at intervals, one end of the first connecting column 152 passes through the intermediate body 170 and the pre-stressing rear cover 160 in sequence, and the plurality of first tie rod nuts 180 are matched with the plurality of first connecting columns 152 one by one, and the first tie rod nut 180 is installed on one end of the first connecting column 152; the first connecting column 152 can stably connect the pre-stressing front cover 150, the intermediate body 170 and the pre-stressing rear cover 160 to form a whole and be fastened by the first tie rod nut 180.
[0033] The boost assembly 200 includes a boost front cover 230, a boost rear cover 240, a high pressure head 250 installed on the boost front cover 230, and a boost cylinder 260, one end of the boost cylinder 260 is installed on the boost front cover 230, and the other end of the boost cylinder 260 is installed on the boost rear cover 240, a boost air inlet 241 is opened on the boost rear cover 240, a boost return air port 231 is opened on the boost front cover 230, the boost piston 220 is located in the boost cylinder 260, one end of the boost rod 210 is installed on the boost piston 220, and the other end of the boost rod 210 is slidably installed on the boost front cover 230, and a boost chamber 251 is opened inside the high pressure head 250. The boost cylinder 260 is provided with a cylinder chamber 261 , the boost piston 220 is located in the cylinder chamber 261 , and the boost air inlet 241 and the boost return air inlet are both connected to the cylinder chamber 261 .
[0034] It also includes multiple second tie rod nuts 270. The supercharged front cover 230 has multiple second connecting columns 232 arranged at intervals. One end of the second connecting column 232 passes through the supercharged rear cover 240. The multiple second tie rod nuts 270 are matched with the multiple second connecting columns 232 one by one. The second tie rod nuts 270 are installed on one end of the second connecting column 232. The setting of the multiple second connecting columns 232 can stably connect the supercharged front cover 230 and the supercharged rear cover 240 to form a whole, and fasten them through the second tie rod nuts 270.
[0035] The boost front cover 230 is provided with a boost slide groove 233, an upper second oil hole 234, and a lower second oil hole 235. The upper second oil hole 234 and the lower second oil hole 235 are both connected to the boost slide groove 233. One end of the boost slide groove 233 is connected to the cylinder chamber 261, and the other end of the boost slide groove 233 is connected to the boost chamber 251. One end of the boost rod 210 is slidably installed on the boost slide groove 233.
[0036] The intermediate body 170 is provided with a middle slide groove 171, an upper first oil hole 172, a lower first oil hole 173, an oil pressure hole 174 and a middle oil inlet hole 175. The upper first oil hole 172, the lower first oil hole 173 and the oil pressure hole 174 are all connected to the slide groove, one end of the upper first oil hole 172 is connected to the upper second oil hole 234, the other end of the upper first oil hole 172 is connected to the middle oil inlet hole 175, the lower first oil hole 173 is connected to the lower second oil hole 235, one end of the middle slide groove 171 is connected to the oil storage chamber 131, and the other end of the middle slide groove 171 is connected to the iron cylinder chamber 141. One end of the front rod 110 is slidably mounted on the middle slide groove 171, and one end of the oil pressure gauge 300 is mounted on the oil pressure hole 174; the pre-pressure air inlet 151 is connected to the middle slide groove 171. When the air is filled, the hydraulic oil in the oil storage chamber 131 can enter the upper second oil hole 234 through the upper first oil hole 172, and then enter the boosting slide groove 233 through the upper second oil hole 234, enter the lower second oil hole 235 and the boosting chamber 251 through the boosting slide groove 233, enter the lower first oil hole 173 through the lower second oil hole 235, and finally enter the iron cylinder chamber 141 through the middle slide groove 171, and drive the front piston 120 to move downward, thereby driving the front rod 110 to move downward, and the pre-compression return air inlet 161 is exhausted. Similarly, when air is taken in to the pre-compression return air port 161, it is carried out in the opposite direction described above. Finally, the pre-compression air inlet 151 is exhausted, the front piston 120 moves up, and the front rod 110 moves up. The middle slide groove 171 includes a first middle slide groove and a second middle slide groove, the first middle slide groove is connected with the second middle slide groove, the diameter of the first middle slide groove is smaller than the diameter of the second middle slide groove, the first middle slide groove 171 is respectively connected with the upper first oil hole 172 and the oil storage chamber 131, and the lower first oil hole 173 and the oil pressure hole 174 are both connected with the second middle slide groove 171; since the diameter of the second middle slide groove is larger than the diameter of the first middle slide groove, the lower first oil hole 173 and the oil pressure hole 174 can both be connected with the iron cylinder chamber 141 through the second middle slide groove 171.
[0037] The working principle of the utility model is as follows: first, the pre-compression return air port 161 and the boost return air port 231 take in air, and the boost component 200 is in an initial reset state; the pre-compression air inlet 151 starts to ventilate, the pre-compression return air port 161 exhausts, the front rod 110 starts to retract, and the pre-compression is completed; the boost air inlet 241 starts to ventilate, the boost return air port 231 exhausts, the boost rod 210 starts to descend, and the pressure is increased downward, and the high-pressure hydraulic oil pushes the front rod 110 and the front piston to complete the boost and pressure maintenance; the boost return air port 231 is ventilated, the boost air inlet 241 is exhausted, the boost rod 210 is reset, the pre-compression return air port 161 is ventilated, the pre-compression air inlet 151 is exhausted, and the front rod 110 is quickly reset; the above is a complete action.
[0038] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.
Claims
1. An inverted reverse output type gas-liquid booster cylinder, characterized in that: The invention comprises a pre-pressurizing assembly, a boosting assembly and an oil pressure gauge installed on the pre-pressurizing assembly, a front rod and a front piston installed on the pre-pressurizing assembly, and a boosting rod and a boosting piston installed on the boosting assembly, the pre-pressurizing assembly is provided with an oil storage chamber, the boosting assembly is provided with a boosting chamber, the oil storage chamber is located above the boosting chamber, the pre-pressurizing assembly is communicated with the boosting assembly, the front piston is installed on one end of the front rod, the boosting piston is installed on one end of the boosting rod, the pre-pressurizing assembly is provided with a pre-pressurizing air inlet and a pre-pressurizing return air port, the boosting assembly is provided with a boosting air inlet and a boosting return air port, the pre-pressurizing air inlet is located above the front piston, the pre-pressurizing return air port is located below the front piston, the boosting air inlet is located above the boosting piston, and the boosting return air port is located below the boosting piston.
2. The inverted reverse output type gas-liquid booster cylinder according to claim 1, characterized in that: The pre-stressing assembly includes an oil storage cylinder, an iron cylinder, a pre-stressing front cover, a pre-stressing rear cover and an intermediate body. One end of the front rod passes through the pre-stressing front cover, the oil storage cylinder and the intermediate body in sequence and extends into the iron cylinder. The front piston is located in the iron cylinder. One end of the oil storage cylinder is installed on the intermediate body, and the other end of the oil storage cylinder is installed on the pre-stressing front cover. One end of the iron cylinder is installed on the intermediate body, and the other end of the iron cylinder is installed on the pre-stressing rear cover. The pre-stressing air inlet is opened on the pre-stressing front cover, and the pre-stressing return air port is opened on the pre-stressing rear cover. The intermediate body is connected to the boosting assembly.
3. The inverted reverse output type gas-liquid booster cylinder according to claim 2, characterized in that: The iron cylinder barrel is provided with an iron cylinder chamber, the oil storage chamber is opened inside the oil storage barrel, the pre-compression air inlet is connected with the oil storage chamber, the pre-compression return air port is connected with the iron cylinder chamber, and the front piston is located in the iron cylinder chamber.
4. The inverted reverse output type gas-liquid booster cylinder according to claim 3, characterized in that: It also includes a plurality of first tie rod nuts, the pre-stressing front cover has a plurality of first connecting columns arranged at intervals, one end of the first connecting column passes through the intermediate body and the pre-stressing rear cover in sequence, the plurality of first tie rod nuts are matched with the plurality of first connecting columns one by one, and the first tie rod nut is installed on one end of the first connecting column.
5. The inverted reverse output type gas-liquid booster cylinder according to claim 4, characterized in that: The boost assembly includes a boost front cover, a boost rear cover, a high pressure head installed on the boost front cover, and a boost cylinder, one end of the boost cylinder is installed on the boost front cover, the other end of the boost cylinder is installed on the boost rear cover, the boost air inlet is opened on the boost rear cover, the boost return air port is opened on the boost front cover, the boost piston is located in the boost cylinder, one end of the boost rod is installed on the boost piston, the other end of the boost rod is slidably installed on the boost front cover, and the boost chamber is opened inside the high pressure head.
6. The inverted reverse output type gas-liquid booster cylinder according to claim 5, characterized in that: The boost cylinder is provided with a cylinder chamber, the boost piston is located in the cylinder chamber, and the boost air inlet and the boost return port are both in communication with the cylinder chamber.
7. The inverted reverse output type gas-liquid booster cylinder according to claim 6, characterized in that: It also includes a plurality of second tie rod nuts, the supercharged front cover has a plurality of second connecting columns arranged at intervals, one end of the second connecting column passes through the supercharged rear cover, the plurality of second tie rod nuts are matched with the plurality of second connecting columns one by one, and the second tie rod nuts are installed on one end of the second connecting column.
8. The inverted reverse output type gas-liquid booster cylinder according to claim 7, characterized in that: The boost front cover is provided with a boost slide, an upper second oil hole, and a lower second oil hole. The upper second oil hole and the lower second oil hole are both connected to the boost slide. One end of the boost slide is connected to the cylinder chamber, and the other end of the boost slide is connected to the boost chamber. One end of the boost rod is slidably installed on the boost slide.
9. The inverted reverse output type gas-liquid booster cylinder according to claim 8, characterized in that: The intermediate body is provided with a middle slide groove, an upper first oil hole, a lower first oil hole, an oil pressure hole and a middle oil inlet hole. The upper first oil hole, the lower first oil hole and the oil pressure hole are all connected with the slide groove, one end of the upper first oil hole is connected with the upper second oil hole, the other end of the upper first oil hole is connected with the middle oil inlet hole, the lower first oil hole is connected with the lower second oil hole, one end of the middle slide groove is connected with the oil storage chamber, the other end of the middle slide groove is connected with the iron cylinder chamber, one end of the front rod is slidably mounted on the middle slide groove, and one end of the oil pressure gauge is mounted on the oil pressure hole.
10. The inverted reverse output type gas-liquid booster cylinder according to claim 9, characterized in that: The middle slide groove includes a first middle slide groove and a second middle slide groove, the first middle slide groove is connected with the second middle slide groove, the diameter of the first middle slide groove is smaller than the diameter of the second middle slide groove, the first middle slide groove is respectively connected with the upper first oil hole and the oil storage chamber, and the lower first oil hole and the oil pressure hole are both connected with the second middle slide groove.