A hydraulic lock with a lock core having a steel ball sealing structure

Abstract

The present invention relates to the technical field of hydraulic valves, and specifically to a hydraulic lock having a steel ball sealing structure in a lock core, comprising a reversing valve body, a hydraulic valve body being mounted on the upper end of the reversing valve body, a steel ball sealing assembly being arranged inside the hydraulic valve body, and a filter assembly for filtering oil being fixedly mounted on the side wall of the hydraulic valve body. By arranging an electric reset steel ball sealing structure and combining it with a manual reset structure, when the electric reset cannot be completed, the reset process can still be completed manually, thereby avoiding the problem of oil port pressure buildup caused by valve stem jamming, which increases the difficulty and time cost of the test. At the same time, a filter structure is arranged on the side wall of the hydraulic element, which can filter and remove impurities from the oil entering the hydraulic lock, thereby reducing the possibility of valve stem jamming, thereby improving the smoothness of the reset of the actuator and avoiding the problem of oil port pressure buildup.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic valves, in particular to a hydraulic lock with a lock core having a steel ball sealing structure. Background Art

[0002] A hydraulic lock is a device used to lock the position of a hydraulic cylinder. Its core function is to ensure that the circuit oil does not flow, so that the hydraulic cylinder remains stationary under the action of external loads.

[0003] In the operation of hydraulic system, the rising action of system oil cylinder often makes the actuator unable to reset due to the failure of valve stem jam. The existing measures to solve this problem are usually to first disassemble the pipe connected to the system oil cylinder, release the hydraulic oil in the system oil cylinder to complete the pressure release process, so as to reset the actuator. This will increase the maintenance cost and installation risk during the maintenance process. At the same time, in order to meet the performance requirements of customers for the product, the hydraulic lock needs to be subjected to pressure maintenance and strengthening test before leaving the factory. During the test, the jamming of the valve stem will cause the oil port to be pressurized, making it impossible to quickly replace the quick-change joint, which increases the difficulty and time cost of the test. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hydraulic lock having a lock core with a steel ball sealing structure. By providing an electric reset steel ball sealing structure and combining it with a manual reset structure, when the electric reset cannot be completed, the reset process can still be completed manually, thereby avoiding the problem of oil port pressure buildup caused by valve stem jamming, which increases the difficulty and time cost of testing. At the same time, a filtering structure is provided on the side wall of the hydraulic element, which can filter and remove impurities from the oil entering the hydraulic lock, reducing the possibility of valve stem jamming, thereby improving the smoothness of the actuator reset and avoiding the problem of oil port pressure buildup.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a hydraulic lock with a lock core and a steel ball sealing structure, comprising a reversing valve body, a coil A is arranged on one side of the reversing valve body, and a coil B is arranged on the other side, a hydraulic valve body is installed on the upper end of the reversing valve body, a steel ball sealing assembly is arranged inside the hydraulic valve body, a filter assembly for filtering oil is fixedly installed on the side wall of the hydraulic valve body, a valve stem channel is opened in the middle of the reversing valve body, a valve stem is slidably arranged inside the valve stem channel, and a reset spring is installed between the two ends of the valve stem and the side walls of the two ends of the valve stem channel.

[0006] Preferably, a working port A is provided on one side of the top of the hydraulic valve body, a working port B is provided on the side of the working port A, an oil inlet P is provided on the side between the working ports A and B, and a mid-position channel Y is provided inside the hydraulic valve body.

[0007] Preferably, the steel ball sealing assembly includes a pressure rod, a slide groove is provided inside the hydraulic valve body, a pressure rod is slidably installed inside the slide groove, one end of the pressure rod extends to the outside of the hydraulic valve body, and the other end abuts against the push rod, the push rod is slidably installed in the slide groove, the lock core is installed in the movable groove of the lock core, the movable groove of the lock core and the slide groove are connected, a spring seat is movably installed inside the lock core, a steel ball is arranged between the spring seat and the lock core, one end of the push rod away from the pressure rod abuts against the steel ball, a screw plug is arranged on the side of the spring seat away from the steel ball, and an extrusion spring is installed between the screw plug and the spring seat.

[0008] Preferably, a pressure relief oil passage is formed between the slide groove and the lock core movable groove, and the pressure relief oil passage is used to connect the working port A and the valve stem channel.

[0009] Preferably, the slide groove, the valve stem channel and the working port B are in a connected state.

[0010] Preferably, the filter assembly includes a barrel unit, an end cover unit and a filter cooperation unit. The barrel unit is fixedly mounted on the outer wall of the hydraulic valve body, the upper end of the barrel unit is sealed with an end cover unit, and the filter cooperation unit is arranged inside the barrel unit.

[0011] Preferably, the cylinder unit includes a filter cylinder, the filter cylinder is fixedly installed on the outer wall of the hydraulic valve body, a threaded section is provided at the upper end of the inner wall of the filter cylinder, an oil unloading groove is provided at the lower end of the inner wall of the filter cylinder, oil leakage holes are evenly provided along the circumference of the inner wall of the oil unloading groove near the upper end, an oil outlet pipe is installed at the lower end of the outer wall of the oil unloading groove, and the oil outlet pipe is connected to the inside of the oil unloading groove.

[0012] Preferably, the end cover unit includes a top cover, which is arranged on the upper end of the filter cylinder, an externally threaded cylinder is fixedly installed on the inner side of the top cover, the externally threaded cylinder and the threaded section on the upper end of the inner wall of the filter cylinder are matched and connected, an annular magnetic plate is fixedly arranged on the inner side of the externally threaded cylinder, an annular baffle is fixedly arranged on the inner side of the annular magnetic plate, an oil inlet pipe is fixedly installed on the middle part of the top cover, a flow retarder is fixedly connected to the lower end of the oil inlet pipe, the flow retarder is a hollow spherical structure and a plurality of flow retarder holes are opened on its side wall.

[0013] Preferably, the filtering cooperative unit includes a T-shaped slide bar, a T-shaped slide bar is slidingly provided through the middle of the bottom of the filter cylinder, a sealing ring is provided between the T-shaped slide bar and the bottom of the filter cylinder, a pressure plate is fixedly connected to the upper end of the T-shaped slide bar, the pressure plate and the inner wall of the filter cylinder slide in cooperation, a coil spring is sleeved on the T-shaped slide bar between the pressure plate and the sealing ring, a J-shaped tube body is uniformly penetrated through the position of the pressure plate near the edge along its circumference, the lower end of the J-shaped tube body is fixedly connected to the bottom of the filter cylinder, an upper piston rod is slidingly provided inside the end of the J-shaped tube body above the pressure plate, a filter screen is fixedly connected to the upper end of the upper piston rod, the filter screen and the inner wall of the filter cylinder slide in cooperation, a lower piston rod is slidingly provided inside the end of the J-shaped tube body below the pressure plate, and the upper end of the lower piston rod is fixedly connected to the lower end of the pressure plate.

[0014] Preferably, the filter screen gradually tilts upward from the edge to the center and a slag gathering ring is fixedly installed at the edge of the upper end surface of the filter screen, and the upper end surface of the slag gathering ring has a corrugated structure.

[0015] Beneficial effects of the present invention:

[0016] 1. The steel ball sealing assembly can be set up to delay the electric reset of the valve stem, and the lifting cylinder can be lowered by manual pressing, avoiding the problem of oil port pressure holding, reducing the difficulty of the test and shortening the time cost;

[0017] 2. The filter assembly can filter and remove impurities from the oil entering the hydraulic lock, ensuring the cleanliness of the oil, reducing the possibility of valve stem sticking, and thus improving the smoothness of the actuator resetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of the hydraulic valve body and the reversing valve body in the present invention;

[0021] Figure 3 It is a structural schematic diagram of the screw plug, the extrusion spring, the spring seat, the steel ball, the lock core, the lock core movable groove, the installation groove and the pressure relief oil channel in the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the filter assembly in the present invention;

[0023] Figure 5 The present invention Figure 4 Schematic diagram of the three-dimensional structure after removing part of the side wall of the filter cylinder;

[0024] Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure at C;

[0025] Figure 7 The present invention Figure 4 A schematic diagram of a cross-sectional three-dimensional structure;

[0026] Figure 8 The present invention Figure 7 A schematic diagram of the structure at D of FIG.

[0027] Fig. 9 The present invention Figure 7 Enlarged structural diagram at E.

[0028] In the figure:

[0029] 1. Hydraulic valve body; 2. Reversing valve body; 3. Reset spring; 4. Valve stem channel; 5. Pressure rod; 6. Screw plug; 7. Extrusion spring; 8. Spring seat; 9. Steel ball; 10. Lock core; 11. Lock core movable groove; 12. Mounting groove; 13. Pressure relief oil channel; 14. Push rod; 15. Valve stem;

[0030] Working port A; working port B; middle channel Y; oil inlet P;

[0031] 16. Cylinder unit; 161. Filter cylinder; 162. Oil unloading tank; 163. Oil leakage hole; 164. Oil outlet pipe;

[0032] 17, end cover unit; 171, top cover; 172, external threaded cylinder; 173, annular magnetic plate; 174, annular baffle; 175, oil inlet pipe; 176, flow retarder;

[0033] 18. Filter cooperative unit; 181. T-shaped slide bar; 182. Pressure plate; 183. Sealing ring; 184. Coil spring; 185. J-shaped tube body; 186. Upper piston rod; 187. Lower piston rod; 188. Filter screen; 1881. Slag gathering ring. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] Embodiment 1:

[0036] See also Figures 1 to 3 A hydraulic lock with a steel ball sealing structure in the lock core comprises a reversing valve body 2, a coil A is arranged on one side of the reversing valve body 2, and a coil B is arranged on the other side, a hydraulic valve body 1 is installed on the upper end of the reversing valve body 2, a steel ball sealing assembly is arranged inside the hydraulic valve body 1, a valve stem channel 4 is opened in the middle of the reversing valve body 2, a valve stem 15 is slidably arranged inside the valve stem channel 4, and a return spring 3 is installed between the two ends of the valve stem 15 and the side walls of the two ends of the valve stem channel 4.

[0037] A working port A is provided on one side of the top of the hydraulic valve body 1 , a working port B is provided on the side of the working port A, an oil inlet P is provided on the side between the working ports A and B, and a mid-position channel Y is provided inside the hydraulic valve body 1 .

[0038] The steel ball sealing assembly includes a pressure rod 5, a slide groove is opened inside the hydraulic valve body 1, and the pressure rod 5 is slidably installed inside the slide groove. One end of the pressure rod 5 extends to the outside of the hydraulic valve body 1, and the other end abuts against the push rod 14. The push rod 14 is slidably installed in the slide groove. The lock core 10 is installed in the lock core movable groove 11, and the lock core movable groove 11 is connected to the slide groove. A spring seat 8 is movably installed inside the lock core 10, and a steel ball 9 is arranged between the spring seat 8 and the lock core 10. One end of the push rod 14 away from the pressure rod 5 abuts against the steel ball 9, and a screw plug 6 is arranged on the side of the spring seat 8 away from the steel ball 9, and an extrusion spring 7 is installed between the screw plug 6 and the spring seat 8.

[0039] A pressure relief oil passage 13 is formed between the slide groove and the lock core movable groove 11 , and the pressure relief oil passage 13 is used to connect the working port A and the valve stem passage 4 .

[0040] The slide groove, the valve stem channel 4 and the working port B are in a communicating state.

[0041] During specific operation, the working port A is connected to the rodless chamber of the hydraulic cylinder, the working port B is connected to the rod chamber of the hydraulic cylinder, the oil inlet P is connected to the external oil tank, and the hydraulic oil enters the middle channel Y through the oil inlet P. At this time, coil A is energized. After coil A is energized, it will push the valve stem 15 to move toward coil B, so that the middle channel Y and the working port A are connected. At the same time, the working port B is connected to the external oil tank. At this time, the hydraulic oil flows to the rodless chamber of the hydraulic cylinder and lifts the hydraulic cylinder. When coil A is powered off, coil A loses power, and the valve stem 15 returns to the middle position under the action of the reset spring 3. Due to the presence of the steel ball sealing assembly, the hydraulic cylinder will always remain in the lifted state. During normal operation or testing, coil B is energized by energizing coil B to allow the hydraulic oil to flow to the working port B, pushing the push rod 14 to open the lock core 10, thereby connecting the working port A and the pressure relief oil channel 13, and causing the hydraulic cylinder to descend;

[0042] When the valve stem 15 is stuck, the coil B is energized and cannot complete the reversal, and the hydraulic cylinder is still in the lifting state, the pressure rod 5 is manually pressed, and the push rod 14 is pushed by the pressure rod 5, so that the steel ball 9 in the lock core 10 is pushed open. At this time, the working port A and the pressure relief oil channel 13 are connected, the extrusion spring 7 is compressed, and the hydraulic cylinder connected to the working port A will complete the descending action. When the pressure on the pressure rod 5 stops, the steel ball 9 will be pushed back to its original position by the reaction force of the extrusion spring 7, thereby completing the purpose of mechanical unlocking.

[0043] Embodiment 2:

[0044] The technical solution is basically the same as that of the first embodiment, see Figure 1 as well as Figures 4 to 9 , the difference is that: the side wall of the hydraulic valve body 1 is fixedly installed with a filter component for filtering oil.

[0045] The filter assembly comprises a cylinder unit 16 . The cylinder unit 16 is fixedly mounted on the outer wall of the hydraulic valve body 1 . The upper end of the cylinder unit 16 is sealed with an end cover unit 17 . A filter coordination unit 18 is arranged inside the cylinder unit 16 .

[0046] The cylinder unit 16 includes a filter cylinder 161, and the filter cylinder 161 is fixedly installed on the outer wall of the hydraulic valve body 1, a threaded section is provided at the upper end of the inner wall of the filter cylinder 161, and an oil unloading groove 162 is provided at the lower end of the inner side wall of the filter cylinder 161. Oil leakage holes 163 are evenly provided along the circumference of the inner wall of the oil unloading groove 162 near the upper end, and an oil outlet pipe 164 is installed at the lower end of the outer wall of the oil unloading groove 162, and the oil outlet pipe 164 is connected to the inside of the oil unloading groove 162.

[0047] The end cover unit 17 includes a top cover 171, which is arranged on the upper end of the filter cylinder 161, an external threaded cylinder 172 is fixedly installed on the inner side of the top cover 171, the external threaded cylinder 172 is connected with the threaded section on the upper end of the inner wall of the filter cylinder 161, an annular magnetic plate 173 is fixedly arranged on the inner side of the external threaded cylinder 172, an annular baffle 174 is fixedly arranged on the inner side of the annular magnetic plate 173, an oil inlet pipe 175 is fixedly installed in the middle part of the top cover 171, and a flow retarder 176 is fixedly connected to the lower end of the oil inlet pipe 175, and the flow retarder 176 is a hollow spherical structure and a plurality of flow retarder holes are opened on its side wall.

[0048] The filtering cooperative unit 18 comprises a T-shaped slide bar 181, a T-shaped slide bar 181 is provided to slide through the middle of the bottom of the filter cylinder 161, a sealing ring 183 is provided between the T-shaped slide bar 181 and the bottom of the filter cylinder 161, a pressing plate 182 is fixedly connected to the upper end of the T-shaped slide bar 181, the pressing plate 182 and the inner wall of the filter cylinder 161 are slidably matched, a spiral spring 184 is sleeved on the T-shaped slide bar 181 between the pressing plate 182 and the sealing ring 183, a J-shaped tube 185 is uniformly provided to penetrate the position near the edge of the pressing plate 182 along its circumference, and the lower end of the J-shaped tube 185 is fixedly connected to the filter cylinder At the bottom of 161, an upper piston rod 186 is slidably provided inside the end of the J-shaped tube 185 located above the pressure plate 182, and a filter screen 188 is fixedly connected to the upper end of the upper piston rod 186. The filter screen 188 and the inner wall of the filter cylinder 161 slide together, and a lower piston rod 187 is slidably provided inside the end of the J-shaped tube 185 located below the pressure plate 182. The upper end of the lower piston rod 187 is fixedly connected to the lower end of the pressure plate 182. The filter screen 188 gradually tilts upward from the edge to the center, and a slag gathering ring 1881 is fixedly installed at the edge of the upper end surface of the filter screen 188, and the upper end surface of the slag gathering ring 1881 has a corrugated structure.

[0049] In this embodiment, the J-shaped tube body 185 between the upper piston rod 186 and the lower piston rod 187 is filled with hydraulic oil. When the lower piston rod 187 moves, it will definitely drive the upper piston rod 186 to move.

[0050] During specific operation, the external oil tank is first connected to the oil inlet pipe 175, and then the oil outlet pipe 164 is connected to the oil inlet port P. At this time, the oil in the external oil tank can be filtered by the filter assembly before entering the reversing valve body 2, thereby preventing the metal impurity particles in the oil from causing the valve stem 15 to be stuck. The specific filtering process is as follows:

[0051] The oil enters the filter cylinder 161 through the oil inlet pipe 175 and the flow damper 176, and then flows down to the filter screen 188. After being filtered by the filter screen 188, the metal impurities in the oil will be filtered to the upper end of the filter screen 188. Under the continuous impact of the subsequent oil, the aforementioned metal impurities will be gathered in the depression on the slag ring 1881. As the oil is continuously filtered, the oil below the filter screen 188 and above the pressure plate 182 continues to increase, and its internal pressure gradually increases. At this time, the pressure of the oil will drive the pressure plate 182 to move downward, and the T-shaped slide bar 181 will also move downward synchronously, and the coil spring 184 will be compressed. When the pressure plate 182 moves to below the oil leakage hole 163, the oil will enter the oil unloading tank 162 through the oil leakage hole 163 and flow into the oil inlet P through the oil outlet pipe 164;

[0052] When the pressure plate 182 continues to move downward, the pressure plate 182 will drive the lower piston rod 187 to move downward. Under the action of the hydraulic oil in the J-shaped tube body 185, the upper piston rod 186 will drive the filter screen 188 to move upward. When the pressure plate 182 moves to a height lower than the oil leakage hole 163, the slag collecting ring 1881 will move to a state close to the lower end of the annular magnetic plate 173, and the annular baffle 174 will abut against the filter screen 188. At this time, the annular magnetic plate 173 can absorb the metal impurities in the depression at the upper end of the slag collecting ring 1881, and the annular baffle 174 can block the oil flowing out of the retarder 176 to prevent the oil from washing away the metal impurities absorbed at the lower end of the annular magnetic plate 173. In this process, the metal impurities filtered out by the filter screen 188 will gather at the inner side of the annular baffle 174.

[0053] When the oil inlet pipe 175 stops taking in oil, and the oil pressure inside the filter cylinder 161 is less than the reaction force of the coil spring 184, the reaction force of the coil spring 184 will drive the pressure plate 182 to reset upward. When the height of the pressure plate 182 exceeds the oil leakage hole 163, the oil above the pressure plate 182 will no longer flow out. At the same time, the slag collecting ring 1881 will move away from the annular magnetic plate 173, and the metal impurities on the inner side of the annular baffle 174 will enter the recessed part at the upper end of the slag collecting ring 1881 again. At this time, the T-shaped slide bar 181 can be manually pulled downward to drive the filter screen 188 to move upward again, thereby adsorbing the remaining metal impurities through the annular magnetic plate 173.

[0054] The working principle of the present invention when in use:

[0055] 1. Working port A is connected to the rodless chamber of the hydraulic cylinder, working port B is connected to the rod chamber of the hydraulic cylinder, and the oil inlet P is connected to the external oil tank. The hydraulic oil enters the middle channel Y through the oil inlet P. At this time, coil A is energized. After coil A is energized, it will push the valve stem 15 to move toward coil B, so that the middle channel Y and working port A are connected. At the same time, working port B is connected to the external oil tank. At this time, the hydraulic oil flows to the rodless chamber of the hydraulic cylinder and lifts the hydraulic cylinder. When coil A is powered off, coil A loses power, and the valve stem 15 returns to the middle position under the action of the reset spring 3. Due to the presence of the steel ball sealing assembly, the hydraulic cylinder will always remain in the lifted state. In normal work or testing, coil B is energized by energizing coil B, so that the hydraulic oil flows to the working port B and pushes the push rod 14 to open the lock core 10, thereby connecting the working port A and the pressure relief oil channel 13, and causing the hydraulic cylinder to descend.

[0056] Second: When the valve stem 15 is stuck, the coil B is energized and cannot complete the reversal, and the hydraulic cylinder is always in the lifting state, the pressure rod 5 is manually pressed, and the push rod 14 is pushed by the pressure rod 5, so that the steel ball 9 in the lock core 10 is pushed open. At this time, the working port A and the pressure relief oil channel 13 are connected, the extrusion spring 7 is compressed, and the hydraulic cylinder connected to the working port A will complete the descending action. When the pressure rod 5 stops being pressed, the steel ball 9 will be pushed back to its original position by the reaction force of the extrusion spring 7, thereby completing the purpose of mechanical unlocking;

[0057] 3. First, connect the external oil tank to the oil inlet pipe 175, and then connect the oil outlet pipe 164 to the oil inlet port P. At this time, the oil in the external oil tank can be filtered by the filter assembly before entering the reversing valve body 2, so as to avoid the metal impurity particles in the oil from causing the valve stem 15 to be stuck. The specific filtering process is as follows: the oil enters the filter cylinder 161 through the oil inlet pipe 175 and the retarder 176, and then flows down to the filter screen 188. After being filtered by the filter screen 188, the metal impurities in the oil will be filtered to the upper end of the filter screen 188. In the subsequent oil Under the continuous impact of the liquid, the aforementioned metal impurities will be gathered in the depression on the slag gathering ring 1881. As the oil is continuously filtered, the oil below the filter screen 188 and above the pressure plate 182 continues to increase, and its internal pressure gradually increases. At this time, the pressure of the oil will drive the pressure plate 182 to move downward, and the T-shaped slide bar 181 will also move downward synchronously, and the spiral spring 184 will be compressed. When the pressure plate 182 moves to below the oil leakage hole 163, the oil will enter the oil unloading tank 162 through the oil leakage hole 163 and flow into the oil inlet P through the oil outlet pipe 164;

[0058] Fourth: During the continuous downward movement of the pressure plate 182, the pressure plate 182 will drive the lower piston rod 187 to move downward. Under the action of the hydraulic oil in the J-shaped tube body 185, the upper piston rod 186 will drive the filter screen 188 to move upward. When the pressure plate 182 moves to a height lower than the oil leakage hole 163, the slag collecting ring 1881 will move to a state close to the lower end of the annular magnetic plate 173, and the annular baffle 174 will abut against the filter screen 188. At this time, the annular magnetic plate 173 can absorb the metal impurities in the depression at the upper end of the slag collecting ring 1881, and the annular baffle 174 can block the oil flowing out of the retarder 176 to prevent the oil from washing away the metal impurities absorbed at the lower end of the annular magnetic plate 173. In this process, the metal impurities filtered out by the filter screen 188 will gather at the inner side of the annular baffle 174.

[0059] 5. When the oil inlet pipe 175 stops taking in oil, and the oil pressure inside the filter cylinder 161 is less than the reaction force of the coil spring 184, the reaction force of the coil spring 184 will drive the pressure plate 182 to reset upward. When the height of the pressure plate 182 exceeds the oil leakage hole 163, the oil above the pressure plate 182 will no longer flow out. At the same time, the slag gathering ring 1881 will move away from the annular magnetic plate 173, and the metal impurities on the inner side of the annular baffle 174 will enter the recessed part at the upper end of the slag gathering ring 1881 again. At this time, the T-shaped slide bar 181 can be manually pulled downward to drive the filter screen 188 to move upward again, thereby absorbing the remaining metal impurities through the annular magnetic plate 173.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic lock with a lock core having a steel ball sealing structure, characterized in that: include: A reversing valve body (2), wherein a coil A is arranged on one side of the reversing valve body (2) and a coil B is arranged on the other side; A hydraulic valve body (1), wherein the hydraulic valve body (1) is mounted on the upper end of the reversing valve body (2), a steel ball sealing assembly is arranged inside the hydraulic valve body (1), and a filter assembly for filtering oil is fixedly mounted on the side wall of the hydraulic valve body (1); The filter assembly comprises a cylinder unit (16), the cylinder unit (16) is fixedly mounted on the outer wall of the hydraulic valve body (1), the upper end of the cylinder unit (16) is sealed with an end cover unit (17), and a filter coordination unit (18) is arranged inside the cylinder unit (16); The cylinder unit (16) comprises a filter cylinder (161), the filter cylinder (161) is fixedly mounted on the outer wall of the hydraulic valve body (1), a threaded section is provided at the upper end of the inner wall of the filter cylinder (161), an oil discharge groove (162) is provided at the lower end of the inner wall of the filter cylinder (161), oil leakage holes (163) are uniformly provided along the circumference of the inner wall of the oil discharge groove (162) at a position close to the upper end, an oil outlet pipe (164) is installed at the lower end of the outer wall of the oil discharge groove (162), and the oil outlet pipe (164) is connected to the inside of the oil discharge groove (162); The filter cooperative unit (18) comprises a T-shaped slide bar (181), the T-shaped slide bar (181) is slidably disposed in the middle of the bottom of the filter cylinder (161), a sealing ring (183) is disposed between the T-shaped slide bar (181) and the bottom of the filter cylinder (161), a pressing plate (182) is fixedly connected to the upper end of the T-shaped slide bar (181), the pressing plate (182) and the inner wall of the filter cylinder (161) are slidably matched, a coil spring (184) is sleeved on the T-shaped slide bar (181) between the pressing plate (182) and the sealing ring (183), and a position near the edge of the pressing plate (182) is uniformly circumferentially A J-shaped tube body (185) is provided through the tube body, the lower end of the J-shaped tube body (185) is fixedly connected to the bottom of the filter cylinder (161), an upper piston rod (186) is slidably provided inside the end of the J-shaped tube body (185) located above the pressure plate (182), a filter screen (188) is fixedly connected to the upper end of the upper piston rod (186), the filter screen (188) and the inner wall of the filter cylinder (161) are slidably matched, a lower piston rod (187) is slidably provided inside the end of the J-shaped tube body (185) located below the pressure plate (182), and the upper end of the lower piston rod (187) is fixedly connected to the lower end of the pressure plate (182); A valve stem passage (4), wherein a valve stem passage (4) is provided in the middle of the reversing valve body (2); A valve stem (15), wherein the valve stem passage (4) is slidably provided with the valve stem (15); A return spring (3), wherein a return spring (3) is installed between the two ends of the valve stem (15) and the side walls of the two ends of the valve stem channel (4); The steel ball sealing assembly comprises a pressure rod (5), a slide groove is provided inside the hydraulic valve body (1), a pressure rod (5) is slidably installed inside the slide groove, one end of the pressure rod (5) extends to the outside of the hydraulic valve body (1), and the other end is in contact with a push rod (14), the push rod (14) is slidably installed in the slide groove, the lock core (10) is installed in a lock core movable groove (11), the lock core movable groove (11) and the slide groove are connected, a spring seat (8) is movably installed inside the lock core (10), a steel ball (9) is arranged between the spring seat (8) and the lock core (10), one end of the push rod (14) away from the pressure rod (5) is in contact with the steel ball (9), a screw plug (6) is arranged on the side of the spring seat (8) away from the steel ball (9), and an extrusion spring (7) is arranged between the screw plug (6) and the spring seat (8).

2. A hydraulic lock having a lock core with a steel ball sealing structure according to claim 1, characterized in that: The hydraulic valve body (1) is provided with a working port A on one side of the top, a working port B on the side of the working port A, an oil inlet P on the side between the working port A and the working port B, and a mid-position channel Y is provided inside the hydraulic valve body (1).

3. A hydraulic lock with a lock core having a steel ball sealing structure according to claim 2, characterized in that: A pressure relief oil passage (13) is formed between the slide groove and the lock core movable groove (11), and the pressure relief oil passage (13) is used to connect the working port A and the valve stem passage (4).

4. A hydraulic lock with a lock core having a steel ball sealing structure according to claim 2, characterized in that: The slide groove, the valve stem channel (4) and the working port B are in a connected state.

5. The hydraulic lock having a lock core with a steel ball sealing structure according to claim 1, characterized in that: The end cover unit (17) comprises a top cover (171), the top cover (171) is arranged at the upper end of the filter cylinder (161), an external threaded cylinder (172) is fixedly mounted on the inner side of the top cover (171), the external threaded cylinder (172) and the threaded section at the upper end of the inner wall of the filter cylinder (161) are connected in cooperation, an annular magnetic plate (173) is fixedly mounted on the inner side of the external threaded cylinder (172), an annular baffle plate (174) is fixedly mounted on the inner side of the annular magnetic plate (173), an oil inlet pipe (175) is fixedly mounted on the middle part of the top cover (171), a flow retarder (176) is fixedly connected to the lower end of the oil inlet pipe (175), and the flow retarder (176) is a hollow spherical structure and has a plurality of flow retarder holes on its side wall.

6. A hydraulic lock with a lock core having a steel ball sealing structure according to claim 1, characterized in that: The filter screen (188) is gradually inclined upward from the edge to the center, and a slag gathering ring (1881) is fixedly installed at the edge of the upper end surface of the filter screen (188), and the upper end surface of the slag gathering ring (1881) has a corrugated structure.

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