Stacked compensation oil cylinder adjustable hydraulic lock

Abstract

A superimposed compensating cylinder adjustable hydraulic lock includes a cover plate, a transition plate, a stop sealing rod, a shuttle valve, a control piston, a valve body, a left solenoid directional valve, and a right solenoid directional valve. A left valve core assembly is inserted into the left side of the valve body cavity, and a right valve core assembly is inserted into the right side of the valve body cavity. The left and right valve core assemblies have the same structure and are located on opposite sides of the vertical centerline of the valve body. A control piston is located at the center of the valve body cavity, with its left and right ends connected to the left and right valve core assemblies, respectively. This design avoids pressure loss and overpressure problems in the hydraulic lock when the cylinder is subjected to loads of different sizes and directions, prevents accidental closing or opening of the hydraulic lock, minimizes pressure loss, reduces the impact of load changes on the hydraulic lock, and is less affected by external loads, thus improving the stability of the hydraulic lock.

Description

Technical Field

[0001] This invention relates to an improvement of hydraulic cylinder lock technology, belonging to the field of hydraulic components, and particularly to a superimposed compensation hydraulic cylinder adjustable hydraulic lock. Background Technology

[0002] Hydraulic technology holds a vital core position in various sectors of the national economy, including defense and civilian industries. With the development of technologies such as robotics, new energy, and materials science, the structure and function of hydraulic products are becoming increasingly complex, and the operating environments are becoming increasingly demanding, thus placing higher requirements on the reliability of hydraulic products. The compensation cylinder, also known as a deck machinery wave compensation hydraulic cylinder, is mainly used in marine crane hydraulic cylinder-type active and passive wave lifting compensation devices to counteract the heel, pitch, and roll caused by waves in the marine environment. Hydraulic lock circuits have wide applications in marine engineering equipment and special equipment. The performance of the hydraulic lock and the degree of matching between it and the cylinder have a significant impact on the functionality and reliability of the entire hydraulic system.

[0003] Hydraulic locks often refer to two-way hydraulic locks, which consist of two hydraulically controlled check valves. The return valve uses the oil pressure from the inlet valve as a pilot oil to open the lock. When the directional valve core is in the neutral position, both the inlet and outlet ports of the hydraulic lock are closed, the rod chamber and rodless chamber of the cylinder are sealed, and the cylinder piston is locked. Currently, existing hydraulic locks have problems such as relatively simple structure and form, large pressure loss, and great susceptibility to external loads.

[0004] Chinese patent application CN201711079475.4, filed on November 6, 2017, discloses a hydraulic control system and method for a multi-cylinder press. The system includes a power source module, multiple compression modules, and an accumulator module. The power source module provides high-pressure, low-flow or low-pressure, high-flow power oil to the compression modules and accumulator module according to their operating states. The compression modules control the tooling states of the compression cylinders. The accumulator module serves as an auxiliary power source, supplying oil to compression cylinders 1 through N. This invention can control multiple compression cylinders to compress individually or synchronously; the operating speed of each compression cylinder is unaffected by load changes, resulting in minimal operational shock; the compression force of each compression cylinder can be individually and steplessly adjusted electrically; and each compression cylinder can perform rapid advance, working advance, and rapid return according to its operating state, improving the compression efficiency of the main unit. However, it still does not solve the problems of large pressure loss and significant susceptibility to external loads.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this patent application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to overcome the problems of large pressure loss and large influence of external load in the prior art, and to provide a superimposed compensation cylinder adjustable hydraulic lock with smaller pressure loss and less influence of external load.

[0007] To achieve the above objectives, the technical solution of the present invention is: a superimposed compensating cylinder adjustable hydraulic lock, the superimposed compensating cylinder adjustable hydraulic lock including a cover plate, a transition plate, a stop sealing rod, a shuttle valve, a control piston, a valve body, a left solenoid directional valve, and a right solenoid directional valve;

[0008] A left valve core assembly is inserted into the left side of the valve body cavity. A right valve core assembly is inserted into the right side of the valve body cavity. The left valve core assembly has the same structure as the right valve core assembly. The left and right valve core assemblies are located on both sides of the vertical center line of the valve body. A control piston is located in the center of the valve body cavity. The left and right ends of the control piston are connected to the left and right valve core assemblies, respectively. The left valve core assembly includes a valve sleeve and a left valve core. A valve sleeve is inserted into the left side of the valve body cavity. The inner wall of the valve sleeve is sleeved with the left valve core. The left inner cavity of the left valve core is connected to the right side of the return spring. The inner side of the return spring is connected to the outer side of the stop sealing rod. The left side of the valve body is connected to the right side of the transition plate. The left side of the transition plate is connected to the right side of the cover plate. The outer side of the left end of the left valve core is connected to the inner side of the transition plate. The left end of the stop sealing rod passes through the transition plate and extends to the inner side of the cover plate for sliding engagement. The left end of the stop sealing rod is connected to the right side of the adjusting screw. The adjusting screw is located on the inner side of the cover plate for sliding engagement. The left end of the adjusting screw passes through the cover plate and extends to the outer side of the cover plate. A shuttle valve is embedded in the top of the valve body.

[0009] The top of the valve body is connected to the bottom of the left solenoid directional valve, and the top of the valve body is connected to the bottom of the right solenoid directional valve. The P port of the left solenoid directional valve is connected to the valve body through an oil outlet channel, the T port of the left solenoid directional valve is connected to the valve body through a drain channel, the A port of the left solenoid directional valve is connected to the valve body through two oil outlet channels, the P port of the right solenoid directional valve is connected to the valve body through three oil outlet channels, the T port of the right solenoid directional valve is connected to the valve body through two drain channels, and the A port of the right solenoid directional valve is connected to the valve body through four oil outlet channels.

[0010] The outer side of the left end of the adjusting screw is connected to the inner side of the nut, and the left side of the cover plate is connected to the right end of the thin nut. The adjusting screw and the thin nut are threaded together.

[0011] The cover plate includes a cover plate oil passage, a cover plate adjusting threaded hole, and a cover plate adjusting sealing hole. The cover plate oil passage is connected to an oil outlet channel. The cover plate has an adjusting threaded hole on its side, and the adjusting screw is threaded into the adjusting threaded hole. The right end of the cover plate has an adjusting sealing hole that is connected to the adjusting threaded hole. The stop sealing rod is slidably engaged with the adjusting sealing hole.

[0012] The transition plate includes a top cavity and a bottom cavity. The bottom cavity and the top cavity are connected to each other on the side of the transition plate. The diameter of the transition plate from the bottom cavity to the top cavity increases. The inner side of the top cavity is connected to the left end of the valve sleeve, and the inner side of the bottom cavity is connected to the outer side of the left end of the left valve core.

[0013] The transition plate also includes a rectangular transition section, an oil passage, and a cylindrical insertion section. The top and bottom of the transition plate are provided with rectangular transition sections. The rectangular transition sections are connected to an oil outlet passage through the oil passage. The cylindrical insertion section is connected to the inner cavity of the valve body.

[0014] The valve sleeve includes a top section, a middle section, and a bottom section. A top cavity is provided on the side of the top section, a middle cavity is provided on the side of the middle section, and a bottom cavity is provided on the side of the bottom section. The top cavity, middle cavity, and bottom cavity are connected to each other.

[0015] The valve core includes a top section, a middle section, and a bottom section. The left side of the top section is connected to the right end of the middle section, and the left end of the middle section is connected to the right end of the bottom section. A spring reset chamber is provided in the bottom section.

[0016] The top section of the valve core includes a sealing conical surface, the right side of which is connected to the left end of the sealing cylindrical surface, the right end of which is connected to the left end of the chamfer, and the right end of the chamfer is connected to the left end of the inclined surface.

[0017] The control piston includes two piston rods and a piston. The left and right ends of the piston are connected to the two piston rods respectively. Multiple piston pressure equalization grooves are opened at the top and bottom of the piston.

[0018] The valve body has a left insertion hole on its left side. The left valve core assembly is disposed within the left insertion hole. The left insertion hole is sequentially connected to the valve body piston hole and the valve body oil port A. The left insertion hole is also connected to oil port B, which is connected to the oil inlet channel of the second shuttle valve. The oil inlet channel of the second shuttle valve is connected to the left shuttle valve hole. The shuttle valve is disposed within the left shuttle valve hole, which is connected to the oil inlet channel of the first shuttle valve. The oil inlet channel of the first shuttle valve is connected to the valve body piston hole. Oil port B is connected to the left solenoid directional valve. The left shuttle valve hole is connected to the left solenoid directional valve. The valves are connected; a valve body right insertion hole is opened on the right side of the valve body, and the right valve core assembly is set in the valve body right insertion hole. The valve body right insertion hole is connected to the valve body piston hole and the valve body oil port C in sequence. The valve body right insertion hole is connected to the oil port D. The oil port D is connected to the oil inlet channel of the four shuttle valve. The oil inlet channel of the four shuttle valve is connected to the right shuttle valve hole. The right shuttle valve hole is connected to the oil inlet channel of the three shuttle valve. The oil inlet channel of the three shuttle valve is connected to the valve body piston hole. The oil port D is connected to the right solenoid directional valve. The right shuttle valve hole is connected to the right solenoid directional valve.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In this invention, a superimposed compensating adjustable hydraulic lock for a hydraulic cylinder includes a shuttle valve embedded in the top of the valve body. The top of the valve body is connected to the bottom of a left solenoid directional valve, and the top of the valve body is connected to the bottom of a right solenoid directional valve. This adds a superimposed control method of shuttle valve and solenoid directional valve, allowing hydraulic fluid to flow through different channels in the valve body to control the cartridge-type hydraulic control check valve. This avoids pressure loss and overpressure problems in the hydraulic lock when the cylinder is subjected to loads of different sizes and directions, prevents the hydraulic lock from being accidentally closed or opened, reduces pressure loss, minimizes the impact of load changes on the hydraulic lock, and is less affected by external loads, thus improving the stability of the hydraulic lock. Therefore, this design is less affected by external loads and operates stably.

[0021] 2. In this invention, a superimposed compensating cylinder adjustable hydraulic lock, a cover plate and a transition plate are threadedly engaged with the valve body via a set screw, pressing the cover plate and transition plate together. The cover plate has an internal oil passage, one end of which communicates with the transition plate's oil passage, and the other end with the bottom cavity of the transition plate. An adjusting threaded hole and an adjusting sealing hole are located in the middle of the cover plate. The adjusting screw is locked with a thin nut and a bolt. One end of a stop sealing rod presses against the adjusting screw, and the other end extends into the spring return cavity at the bottom of the valve core. The distance between the stop sealing rod and the bottom of the spring return cavity is adjusted by the adjusting screw to limit the maximum displacement of the valve core. The valve core, through the cooperation of the valve sleeve and the transition plate, provides support and sealing. The spring return cavity at the bottom of the valve core supports the return spring and stores return pressure oil. Different valve core opening sizes can be set for different application scenarios; a larger opening reduces pressure loss. Therefore, this design offers adjustable pressure and low pressure loss.

[0022] 3. In the superimposed compensation cylinder adjustable hydraulic lock of the present invention, the control piston includes two piston rods and a piston. The left and right ends of the piston are respectively connected to the two piston rods. Multiple piston pressure equalization grooves are opened at the top and bottom of the piston. The control piston has a symmetrical structure, consisting of a rod and a piston. The rod supports the top section of the valve core and is used to push the valve core open. The piston is clearance-fitted with the piston hole of the valve body. Seven annular pressure equalization grooves are opened on the surface of the piston to form an oil film to support and lubricate the piston. The comprehensive superimposed control makes the control piston move smoothly and is not easy to jam. Therefore, this design is sensitive and has high reliability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the left electromagnetic reversing valve in this invention.

[0025] Figure 3 This is a schematic diagram of the cover plate in this invention.

[0026] Figure 4 This is a schematic diagram of the cover plate oil passage in this invention.

[0027] Figure 5 This is a schematic diagram of the valve sleeve in this invention.

[0028] Figure 6 This is a side view of the left valve core in this invention.

[0029] Figure 7 This is a schematic diagram of the top section of the valve core in this invention.

[0030] Figure 8 This is a schematic diagram of the structure for controlling the piston in this invention.

[0031] Figure 9 This is a schematic diagram of the oil circuit connection of the present invention.

[0032] In the diagram: 1. Nut; 2. Thin nut; 3. Adjusting screw; 4. Cover plate; 401. Cover plate oil passage; 402. Cover plate adjusting threaded hole; 403. Cover plate adjusting sealing hole; 5. Transition plate; 501. Transition plate rectangular transition section; 502. Transition plate oil passage; 503. Transition plate cylindrical insertion section; 504. Transition plate top cavity; 505. Transition plate bottom cavity; 6. Stop sealing rod; 7. Return spring; 8. Left valve core assembly A; 9. Right valve core assembly B; 10. Valve sleeve; 11. Valve sleeve top; 12. Valve sleeve middle section; 13. Valve sleeve bottom section; 14. Valve sleeve top cavity; 15. Valve sleeve middle cavity. 5. Valve sleeve bottom cavity 806, left valve core 9, valve core top section 901, inclined surface 9011, chamfer 9012, sealing cylindrical surface 9013, sealing conical surface 9014, valve core middle section 902, valve core bottom section 903, spring return cavity 904, shuttle valve 10, control piston 11, piston rod 1101, piston 1102, piston pressure equalizing groove 1103, valve body 12, valve body left insertion hole 1201, valve body right insertion hole 1202, valve body piston hole 1203, left shuttle valve hole 1204, right shuttle valve hole 1205, oil port A 1206, Oil port B; 1207, Oil port C; 1208, Oil port D; 1209, First shuttle valve inlet channel; 1210, Second shuttle valve inlet channel; 1211, Third shuttle valve inlet channel; 1212, Fourth shuttle valve inlet channel; 1213, Second outlet channel; 1214, Fourth outlet channel; 1215, First drain channel; 1216, Second drain channel; 1217, First outlet channel; 1218, Third outlet channel; 1219, Right valve core; 13, Left solenoid directional valve; 14, Right solenoid directional valve; 15. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See Figures 1 to 9A superimposed compensating cylinder adjustable hydraulic lock, the superimposed compensating cylinder adjustable hydraulic lock includes a cover plate 4, a transition plate 5, a stop sealing rod 6, a shuttle valve 10, a control piston 11, a valve body 12, a left solenoid directional valve 14, and a right solenoid directional valve 15.

[0035] A left valve core assembly A is inserted into the left side of the inner cavity of the valve body 12, and a right valve core assembly B is inserted into the right side of the inner cavity of the valve body 12. The left valve core assembly A and the right valve core assembly B have the same structure and are located on both sides of the vertical center line of the valve body 12. A control piston 11 is located at the center of the inner cavity of the valve body 12. The left and right ends of the control piston 11 are connected to the left valve core assembly A and the right valve core assembly B, respectively. The left valve core assembly A includes a valve sleeve 8 and a left valve core 9. The valve sleeve 8 is inserted into the left side of the inner cavity of the valve body 12, and the inner wall of the valve sleeve 8 is sleeved with the left valve core 9. The left inner cavity of the left valve core 9 is connected to the right side of the return spring 7. The inner side of the return spring 7 is connected to the outer side of the stop sealing rod 6. The left side of the valve body 12 is connected to the right side of the transition plate 5. The left side of the transition plate 5 is connected to the right side of the cover plate 4. The outer side of the left end of the left valve core 9 is connected to the inner side of the transition plate 5. The left end of the stop sealing rod 6 extends through the transition plate 5 to the inner side of the cover plate 4 for sliding engagement. The left end of the stop sealing rod 6 is connected to the right side of the adjusting screw 3. The adjusting screw 3 is located on the inner side of the cover plate 4 for sliding engagement. The left end of the adjusting screw 3 extends through the cover plate 4 and to the outer side of the cover plate 4. A shuttle valve 10 is embedded in the top of the valve body 12.

[0036] The top of the valve body 12 is connected to the bottom of the left solenoid directional valve 14, and the top of the valve body 12 is connected to the bottom of the right solenoid directional valve 15. The P port of the left solenoid directional valve 14 is connected to the valve body 12 through an oil outlet channel 1218. The T port of the left solenoid directional valve 14 is connected to the valve body 12 through an oil drain channel 1216. The A port of the left solenoid directional valve 14 is connected to the valve body 12 through a second oil outlet channel 1214. The P port of the right solenoid directional valve 15 is connected to the valve body 12 through a third oil outlet channel 1219. The T port of the right solenoid directional valve 15 is connected to the valve body 12 through a second oil drain channel 1217. The A port of the right solenoid directional valve 15 is connected to the valve body 12 through a fourth oil outlet channel 1215.

[0037] The outer side of the left end of the adjusting screw 3 is connected to the inner side of the nut 1, and the left side of the cover plate 4 is connected to the right end of the thin nut 2. The adjusting screw 3 and the thin nut 2 are threaded together.

[0038] The cover plate 4 includes a cover plate oil passage 401, a cover plate adjusting threaded hole 402, and a cover plate adjusting sealing hole 403. The cover plate oil passage 401 is connected to an oil outlet passage 1218. The cover plate 4 has a cover plate adjusting threaded hole 402 on its side. The adjusting screw 3 is threaded into the cover plate adjusting threaded hole 402. The right end of the cover plate 4 has a cover plate adjusting sealing hole 403 that is connected to the cover plate adjusting threaded hole 402. The stop sealing rod 6 is slidably engaged with the cover plate adjusting sealing hole 403.

[0039] The transition plate 5 includes a top cavity 504 and a bottom cavity 505. The bottom cavity 505 and the top cavity 504 are connected to each other on the side of the transition plate 5. The diameter of the holes from the bottom cavity 505 to the top cavity 504 increases. The inner side of the top cavity 504 is connected to the left end of the valve sleeve 8, and the inner side of the bottom cavity 505 is connected to the outer side of the left end of the left valve core 9.

[0040] The transition plate 5 also includes a rectangular transition section 501, an oil passage 502, and a cylindrical insertion section 503. The top and bottom of the transition plate 5 are provided with rectangular transition sections 501. The rectangular transition sections 501 are connected to an oil outlet passage 1218 through the oil passage 502. The cylindrical insertion section 503 is connected to the inner cavity of the valve body 12.

[0041] The valve sleeve 8 includes a valve sleeve top section 801, a valve sleeve middle section 802, and a valve sleeve bottom section 803. A valve sleeve top cavity 804 is provided on the side of the valve sleeve top section 801, a valve sleeve middle cavity 805 is provided on the side of the valve sleeve middle section 802, and a valve sleeve bottom cavity 806 is provided on the side of the valve sleeve bottom section 803. The valve sleeve top cavity 804, valve sleeve middle cavity 805, and valve sleeve bottom cavity 806 are connected to each other.

[0042] The valve core 9 includes a top section 901, a middle section 902, and a bottom section 903. The left side of the top section 901 is connected to the right end of the middle section 902, and the left end of the middle section 902 is connected to the right end of the bottom section 903. A spring reset chamber 904 is provided in the bottom section 903.

[0043] The valve core top section 901 includes a sealing cone surface 9014, the right side of which is connected to the left end of the sealing cylindrical surface 9013, the right end of which is connected to the left end of the chamfer 9012, and the right end of the chamfer 9012 is connected to the left end of the inclined surface 9011.

[0044] The control piston 11 includes two piston rods 1101 and a piston 1102. The left and right ends of the piston 1102 are respectively connected to the two piston rods 1101. Multiple piston pressure equalization grooves 1103 are provided on the top and bottom of the piston 1102.

[0045] The valve body 12 has a left insertion hole 1201 on its left side. The left valve core assembly A is disposed in the left insertion hole 1201. The left insertion hole 1201 is connected to the valve body piston hole 1203 and the oil port A1206 of the valve body 12 in sequence. The left insertion hole 1201 is connected to the oil port B1207, which is connected to the oil inlet channel 1211 of the second shuttle valve. The oil inlet channel 1211 of the second shuttle valve is connected to the left shuttle valve hole 1204. The shuttle valve 10 is disposed in the left shuttle valve hole 1204, which is connected to the oil inlet channel 1210 of the first shuttle valve. The oil inlet channel 1210 of the first shuttle valve is connected to the valve body piston hole 1203. The oil port B1207 is connected to the left solenoid directional valve 14. The left shuttle valve hole 1204 is connected to the left solenoid directional valve 14. The valve body 12 is connected to valve 14. A valve body right insertion hole 1202 is provided on the right side of the valve body 12. The right valve core assembly B is disposed in the valve body right insertion hole 1202. The valve body right insertion hole 1202 is connected to the valve body piston hole 1203 and the oil port C1208 of the valve body 12 in sequence. The valve body right insertion hole 1202 is connected to the oil port D1209. The oil port D1209 is connected to the oil inlet channel 1213 of the four shuttle valve. The oil inlet channel 1213 of the four shuttle valve is connected to the right shuttle valve hole 1205. The right shuttle valve hole 1205 is connected to the oil inlet channel 1212 of the three shuttle valve. The oil inlet channel 1212 of the three shuttle valve is connected to the valve body piston hole 1203. The oil port D1209 is connected to the right solenoid directional valve 15. The right shuttle valve hole 1205 is connected to the right solenoid directional valve 15.

[0046] The principle of this invention is explained as follows: When oil returns through port A1206, oil connects to the rod chamber of the cylinder through port B1207, pressurized oil flows through port C1208, and oil connects to the rodless chamber of the cylinder through port D1209, the pressurized oil at port C1208 first opens the right valve core 13. Pressure is then released through the rodless chamber of the cylinder via port D1209. Simultaneously, the pressurized oil pushes the control piston 11 to the left, where it abuts against the top section 901 of the left valve core 9. The pressure at port C1208 continues to rise until it opens the left valve core 9. Ports A1206 and B1207 then connect, oil is discharged from the rodless chamber of the cylinder, and the cylinder begins to operate. At the same time, the oil inlet channel 12 of the shuttle valve... 10. Oil enters the inlet channels 1211, 1212, and 1213 of the two shuttle valves respectively. The pressure oil with the higher pressure among the inlet channels 1210, 1212, 1211, and 1213 of the shuttle valves exits through the outlet channels 1214 and 1215 of the shuttle valves. Then, it passes through the left solenoid directional valve 14, the right solenoid directional valve 15, the outlet channel 1218, the outlet channel 1219, and the cover plate oil passage 401 into the bottom cavity of the transition plate 505. The pressure oil in the bottom cavity of the transition plate 505 is balanced with the oil ports A 1206 and C 1208, controlling the opening size of the left valve core 9 and the right valve core 13 to achieve superimposed control.

[0047] Example 1:

[0048] A superimposed adjustable hydraulic lock for compensating cylinders includes a cover plate 4, a transition plate 5, a stop sealing rod 6, a shuttle valve 10, a control piston 11, a valve body 12, a left solenoid directional valve 14, and a right solenoid directional valve 15. A left valve core assembly A is inserted into the left side of the inner cavity of the valve body 12, and a right valve core assembly B is inserted into the right side of the inner cavity of the valve body 12. The left valve core assembly A and the right valve core assembly B have the same structure and are located on opposite sides of the vertical centerline of the valve body 12. A control piston 11 is located at the center of the inner cavity of the valve body 12, and its left and right ends are connected to the left valve core assembly A and the right valve core assembly B, respectively. The left valve core assembly A includes a valve sleeve 8 and a left valve core 9. The valve sleeve 8 is inserted into the left side of the inner cavity of the valve body 12, and the inner wall of the valve sleeve 8 is fitted with the left valve core 9. The left valve core 9 has a left... The inner cavity of the valve body 12 is connected to the right side of the return spring 7. The inner side of the return spring 7 is connected to the outer side of the stop sealing rod 6. The left valve core 9 is limited in maximum displacement by adjusting the screw 3 and adjusting the stop sealing rod 6. The return spring 7 resets the left valve core 9. The left side of the valve body 12 is connected to the right side of the transition plate 5. The left side of the transition plate 5 is connected to the right side of the cover plate 4. The outer side of the left end of the left valve core 9 is connected to the inner side of the transition plate 5. The valve body 12 is tightened by the transition plate 5 and the cover plate 4 through a threaded connection. The left end of the stop sealing rod 6 passes through the transition plate. 5 extends to the inner side of the cover plate 4 for sliding fit. The left end of the stop sealing rod 6 is connected to the right side of the adjusting screw 3. The adjusting screw 3 is located on the inner side of the cover plate 4 for sliding fit. The left end of the adjusting screw 3 passes through the cover plate 4 and extends to the outer side of the cover plate 4. The nut 1 and thin nut 2 are used to lock the adjusting screw 3. The top of the valve body 12 is fitted with a shuttle valve 10. The top of the valve body 12 is connected to the bottom of the left solenoid directional valve 14. The top of the valve body 12 is connected to the bottom of the right solenoid directional valve 15. The P of the left solenoid directional valve 14 The left solenoid directional valve 14 has its T port connected to the valve body 12 via an oil outlet channel 1218, its A port connected to the valve body 12 via an oil drain channel 1216, its P port connected to the valve body 12 via an oil outlet channel 1214, its T port connected to the valve body 12 via an oil drain channel 1217, and its A port connected to the valve body 12 via an oil outlet channel 1215.

[0049] In application: First, the pressurized oil opens the right valve core 13. Simultaneously, the pressurized oil pushes the control piston 11 to the left, where it abuts against the left valve core 9. The pressurized oil pressure continues to rise until it pushes open the left valve core 9, discharging the oil from the rodless chamber of the cylinder, and the cylinder begins to operate. At the same time, oil enters through the inlet channels 1210 (first shuttle valve), 1211 (second shuttle valve), 1212 (third shuttle valve), and 1213 (fourth shuttle valve), respectively. (Comparison of the first shuttle valve...) The high-pressure oil in the valve inlet channel 1210, the three-shuttle valve inlet channel 1212, the two-shuttle valve inlet channel 1211, and the four-shuttle valve inlet channel 1213 exits from the two-outlet channel 1214 and the four-outlet channel 1215. Then, it is balanced by the left solenoid directional valve 14, the right solenoid directional valve 15, the one-outlet channel 1218, and the three-outlet channel 1219, which controls the opening size of the left valve core 9 and the right valve core 13, thus achieving superimposed control.

[0050] Example 2:

[0051] Example 2 is basically the same as Example 1, except that:

[0052] An adjustable hydraulic lock for a superimposed compensating cylinder is provided. The outer side of the left end of the adjusting screw 3 is connected to the inner side of the nut 1, and the left side of the cover plate 4 is connected to the right end of the thin nut 2. The adjusting screw 3 and the thin nut 2 are threadedly engaged. The cover plate 4 includes a cover plate oil passage 401, a cover plate adjusting threaded hole 402, and a cover plate adjusting sealing hole 403. The cover plate oil passage 401 is connected to an oil outlet passage 1218. The cover plate 4 has a cover plate adjusting threaded hole 402 on its side, and the adjusting screw 3 is threadedly engaged with the cover plate adjusting threaded hole 402. The right end of the cover plate 4 has a cover plate adjusting sealing hole 403 that is connected to the cover plate adjusting threaded hole 402. The stop sealing rod 6 is slidably engaged with the cover plate adjusting sealing hole 403.

[0053] Example 3:

[0054] Example 3 is basically the same as Example 1, except that:

[0055] A superimposed compensating cylinder adjustable hydraulic lock, wherein the transition plate 5 includes a transition plate top cavity 504 and a transition plate bottom cavity 505, and the transition plate bottom cavity 505 and transition plate top cavity 504 are connected to each other on the side of the transition plate 5. The diameter of the transition plate bottom cavity 505 to the transition plate top cavity 504 increases in size. The inner side of the transition plate top cavity 504 is connected to the left end of the valve sleeve 8, and the inner side of the transition plate bottom cavity 505 is connected to the outer side of the left end of the left valve core 9. The transition plate 5 also includes a rectangular transition section 501. The transition plate has an oil passage 502 and a cylindrical insertion section 503. The top and bottom of the transition plate 5 are provided with rectangular transition sections 501. The rectangular transition sections 501 are connected to an oil outlet passage 1218 through the oil passage 502. The cylindrical insertion section 503 is connected to the inner cavity of the valve body 12. The top cavity 504 of the transition plate is fixed and statically sealed with the bottom section 803 of the valve sleeve. The bottom cavity 505 of the transition plate cooperates with the bottom section 903 of the valve core to provide support and sealing. The transition plate 5 is tightly attached to the end face of the valve body 12.

[0056] Example 4:

[0057] Example 4 is basically the same as Example 1, except that:

[0058] An adjustable hydraulic lock for a superimposed compensating cylinder, wherein the valve sleeve 8 includes a valve sleeve top section 801, a valve sleeve middle section 802, and a valve sleeve bottom section 803; a valve sleeve top cavity 804 is provided on the side of the valve sleeve top section 801; a valve sleeve middle cavity 805 is provided on the side of the valve sleeve middle section 802; and a valve sleeve bottom cavity 806 is provided on the side of the valve sleeve bottom section 803; the valve sleeve top cavity 804, valve sleeve middle cavity 805, and valve sleeve bottom cavity 806 are interconnected; the valve core 9 includes a valve core top section 901 and a valve core middle section 902. The valve core bottom section 903 and the valve core top section 901 have their left sides connected to the right end of the valve core middle section 902, and their left ends connected to the right end of the valve core bottom section 903. A spring return chamber 904 is provided within the valve core bottom section 903. The valve core top section 901 includes a sealing cone surface 9014 at a 45° angle. The right side of the sealing cone surface 9014 is connected to the left end of the sealing cylindrical surface 9013, and the right end of the sealing cylindrical surface 9013 is connected to the left end of the chamfer 9012. The valve core is connected at one end, with a chamfer of 5° at 9012. The right end of the chamfer 9012 connects to the left end of the inclined surface 9011. The top section 901 of the valve core cooperates with the top end 801 of the valve sleeve to control the opening and closing of the valve. The middle section 802 of the valve sleeve cooperates with the bottom cavity 806 of the valve sleeve for support and sealing. The bottom section 803 of the valve sleeve cooperates with the bottom cavity 505 of the transition plate for support and sealing. The bottom section 903 of the valve core has a spring return cavity 904 for supporting the return spring and storing return pressure oil. The control piston 11 includes two pistons. The piston 1102 is connected to two piston rods 1101 at its left and right ends respectively. Multiple piston pressure equalization grooves 1103 are provided at the top and bottom of the piston 1102. The piston rods 1101 and piston rods 1101 support each other to push open the valve core 9 and control the clearance fit between the piston 11 and the valve body piston hole 1203. Seven annular piston pressure equalization grooves 1103 are provided on the piston surface to form an oil film to support and lubricate the control piston 11.

[0059] Example 5:

[0060] Example 5 is basically the same as Example 1, except that:

[0061] A superimposed compensating cylinder adjustable hydraulic lock, wherein the valve body 12 has a valve body left insertion hole 1201 on the left side, the left valve core assembly A is disposed in the valve body left insertion hole 1201, the valve body left insertion hole 1201 is connected in sequence to the valve body piston hole 1203 and the oil port A1206 of the valve body 12, the valve body left insertion hole 1201 is connected to the oil port B1207, the oil port B1207 is connected to the oil inlet channel 1211 of the second shuttle valve, the oil inlet channel 1211 of the second shuttle valve is connected to the left shuttle valve hole 1204, the shuttle valve 10 is disposed in the left shuttle valve hole 1204, the left shuttle valve hole 1204 is connected to the oil inlet channel 1210 of the first shuttle valve, the oil inlet channel 1210 of the first shuttle valve is connected to the valve body piston hole 1203, the oil port B1207 is connected to the left solenoid directional valve 14, the left shuttle valve hole 1204 is connected to the left shuttle valve hole 1204. 204 is connected to the left solenoid directional valve 14; the right side of the valve body 12 is provided with a valve body right insertion hole 1202, the right valve core assembly B is disposed in the valve body right insertion hole 1202, the valve body right insertion hole 1202 is connected to the valve body piston hole 1203 and the oil port C1208 of the valve body 12 in sequence, the valve body right insertion hole 1202 is connected to the oil port D1209, the oil port D1209 is connected to the four shuttle valve oil inlet channel 1213, the four shuttle valve oil inlet channel 1213 is connected to the right shuttle valve hole 1205, the right shuttle valve hole 1205 is connected to the three shuttle valve oil inlet channel 1212, the three shuttle valve oil inlet channel 1212 is connected to the valve body piston hole 1203, the oil port D1209 is connected to the right solenoid directional valve 15, and the right shuttle valve hole 1205 is connected to the right solenoid directional valve 15.

[0062] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A stack compensating adjustable hydraulic lock for an oil cylinder, characterized by The superimposed compensation oil cylinder adjustable hydraulic lock includes a cover plate (4), a transition plate (5), a stop sealing rod (6), a shuttle valve (10), a control piston (11), a valve body (12), a left electromagnetic reversing valve (14), and a right electromagnetic reversing valve (15); The left valve core assembly (A) is inserted into the left side of the inner cavity of the valve body (12), and the right valve core assembly (B) is inserted into the right side of the inner cavity of the valve body (12). The left valve core assembly (A) and the right valve core assembly (B) are the same in structure, and are arranged on the two sides of the vertical center line of the valve body (12). The control piston (11) is arranged at the center of the inner cavity of the valve body (12), and the left and right ends of the control piston (11) are connected with the left valve core assembly (A) and the right valve core assembly (B). The left valve core assembly (A) comprises a valve sleeve (8) and a left valve core (9). The valve sleeve (8) is inserted into the left side of the inner cavity of the valve body (12), and the inner wall of the valve sleeve (8) is sleeved with the left valve core (9). The left side inner cavity of the left valve core (9) is connected with the right side of a return spring (7). The inner side of the return spring (7) is connected with the outer side of the stop sealing rod (6). The left side of the valve body (12) is connected with the right side of the transition plate (5). The left side of the transition plate (5) is connected with the right side of the cover plate (4). The left end outer side of the left valve core (9) is connected with the inner side of the transition plate (5). The left end of the stop sealing rod (6) extends through the transition plate (5) and is slidingly fitted into the inner side of the cover plate (4). The left end of the stop sealing rod (6) is connected with the right side of an adjusting screw (3). The adjusting screw (3) is slidingly fitted into the inner side of the cover plate (4). The left end of the adjusting screw (3) extends through the cover plate (4) and is connected with the outer side of the cover plate (4). The top of the valve body (12) is embedded with the shuttle valve (10). The top of the valve body (12) is connected with the bottom of the left electromagnetic reversing valve (14), and the top of the valve body (12) is connected with the bottom of the right electromagnetic reversing valve (15). The P port of the left electromagnetic reversing valve (14) is connected with the valve body (12) through an oil outlet flow channel (1218). The T port of the left electromagnetic reversing valve (14) is connected with the valve body (12) through an oil discharge flow channel (1216). The A port of the left electromagnetic reversing valve (14) is connected with the valve body (12) through a second oil outlet flow channel (1214). The P port of the right electromagnetic reversing valve (15) is connected with the valve body (12) through a third oil outlet flow channel (1219). The T port of the right electromagnetic reversing valve (15) is connected with the valve body (12) through a second oil discharge flow channel (1217). The A port of the right electromagnetic reversing valve (15) is connected with the valve body (12) through a fourth oil outlet flow channel (1215).

2. The stack-up compensating adjustable hydraulic lock for an oil cylinder according to claim 1, characterized in that: The left end outer side of the adjusting screw (3) is connected with the inner side of a nut (1). The left side of the cover plate (4) is connected with the right end of a thin nut (2). The adjusting screw (3) is threadedly connected with the thin nut (2).

3. The stackable compensating hydraulic lock for an oil cylinder according to claim 1, characterized in that: The cover plate (4) comprises a cover plate oil channel (401), a cover plate adjusting threaded hole (402) and a cover plate adjusting sealing hole (403). The cover plate oil channel (401) is connected with an oil outlet flow channel (1218). The side surface of the cover plate (4) is provided with the cover plate adjusting threaded hole (402). The adjusting screw (3) is threadedly connected with the cover plate adjusting threaded hole (402). The right end of the cover plate (4) is provided with the cover plate adjusting sealing hole (403) connected with the cover plate adjusting threaded hole (402). The stop sealing rod (6) is slidably connected with the cover plate adjusting sealing hole (403).

4. The stacked compensating oil cylinder adjustable hydraulic lock of any one of claims 1 to 3, wherein: The transition plate (5) comprises a transition plate top cavity (504) and a transition plate bottom cavity (505). The side surface of the transition plate (5) is provided with the transition plate bottom cavity (505) and the transition plate top cavity (504) connected with each other. The hole diameter of the transition plate bottom cavity (505) to the transition plate top cavity (504) presents an increasing trend. The inner side of the transition plate top cavity (504) is connected with the left end of the valve sleeve (8). The inner side of the transition plate bottom cavity (505) is connected with the outer side of the left end of the left valve core (9).

5. The stack compensating adjustable hydraulic lock for an oil cylinder according to claim 4, characterized in that: The transition plate (5) further comprises a transition plate rectangular transition section (501), a transition plate oil channel (502) and a transition plate cylindrical insertion section (503). The top and bottom of the transition plate (5) are provided with the transition plate rectangular transition section (501). The transition plate rectangular transition section (501) is connected with the oil outlet flow channel (1218) through the transition plate oil channel (502). The transition plate cylindrical insertion section (503) is connected with the inner cavity of the valve body (12).

6. The stack compensating adjustable hydraulic lock of any one of claims 1 to 3, wherein: The valve sleeve (8) comprises a valve sleeve top section (801), a valve sleeve middle section (802) and a valve sleeve bottom section (803). The side surface of the valve sleeve top section (801) is provided with a valve sleeve top cavity (804). The side surface of the valve sleeve middle section (802) is provided with a valve sleeve middle cavity (805). The side surface of the valve sleeve bottom section (803) is provided with a valve sleeve bottom cavity (806). The valve sleeve top cavity (804), the valve sleeve middle cavity (805) and the valve sleeve bottom cavity (806) are connected with each other.

7. The super-compensated adjustable hydraulic lock of an oil cylinder according to any one of claims 1 to 3, characterized in that: The valve core (9) comprises a valve core top section (901), a valve core middle section (902) and a valve core bottom section (903). The left side of the valve core top section (901) is connected with the right end of the valve core middle section (902). The left end of the valve core middle section (902) is connected with the right end of the valve core bottom section (903). The valve core bottom section (903) is provided with a spring reset cavity (904).

8. The stack compensating adjustable hydraulic lock for an oil cylinder according to claim 7, characterized in that: The valve core top section (901) comprises a sealing conical surface (9014). The right side of the sealing conical surface (9014) is connected with the left end of a sealing cylindrical surface (9013). The right end of the sealing cylindrical surface (9013) is connected with the left end of a chamfer (9012). The right end of the chamfer (9012) is connected with the left end of an inclined surface (9011).

9. The stacked compensating oil cylinder adjustable hydraulic lock of any one of claims 1 to 3, wherein: The control piston (11) comprises two piston top rods (1101) and a piston (1102). The left and right ends of the piston (1102) are connected with the two piston top rods (1101) respectively. The top and bottom of the piston (1102) are provided with a plurality of piston equalizing grooves (1103).

10. The stacked compensating oil cylinder adjustable hydraulic lock of any one of claims 1 to 3, wherein: The left side of the valve body (12) is provided with a valve body left plug hole (1201), and a left valve core assembly (A) is arranged in the valve body left plug hole (1201). The valve body left plug hole (1201) is in communication with a valve body piston hole (1203) and an oil port A (1206) of the valve body (12) in sequence. The valve body left plug hole (1201) is in communication with an oil port B (1207), the oil port B (1207) is in communication with a two shuttle valve oil inlet flow channel (1211), the two shuttle valve oil inlet flow channel (1211) is in communication with a left shuttle valve hole (1204), a shuttle valve (10) is arranged in the left shuttle valve hole (1204), the left shuttle valve hole (1204) is in communication with a one shuttle valve oil inlet flow channel (1210), the one shuttle valve oil inlet flow channel (1210) is in communication with the valve body piston hole (1203), the oil port B (1207) is in communication with a left electromagnetic reversing valve (14), and the left shuttle valve hole (1204) is in communication with the left electromagnetic reversing valve (14). The right side of the valve body (12) is provided with a valve body right plug hole (1202), a right valve core assembly (B) is arranged in the valve body right plug hole (1202), the valve body right plug hole (1202) is in communication with the valve body piston hole (1203) and an oil port C (1208) of the valve body (12) in sequence, the valve body right plug hole (1202) is in communication with an oil port D (1209), the oil port D (1209) is in communication with a four shuttle valve oil inlet flow channel (1213), the four shuttle valve oil inlet flow channel (1213) is in communication with a right shuttle valve hole (1205), the right shuttle valve hole (1205) is in communication with a three shuttle valve oil inlet flow channel (1212), the three shuttle valve oil inlet flow channel (1212) is in communication with the valve body piston hole (1203), the oil port D (1209) is in communication with a right electromagnetic reversing valve (15), and the right shuttle valve hole (1205) is in communication with the right electromagnetic reversing valve (15).

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