A multifunctional hydraulic cylinder

Abstract

The utility model relates to a multifunctional hydraulic cylinder, including a cylinder housing, a pressure regulating valve, a pressure relief valve, a low-pressure one-way valve, a high-pressure one-way valve, an oil suction drive structure and a cylinder drive structure, wherein the low-pressure one-way valve is installed in the first oil chamber, the high-pressure one-way valve is installed in the second oil chamber, the pressure regulating valve is installed in the third oil chamber, the pressure relief valve is installed in the fourth oil chamber, the cylinder drive structure is installed in the cylinder housing, the fifth oil chamber is connected to the first oil chamber, and the oil suction drive structure is installed in the fifth oil chamber. The multifunctional hydraulic cylinder has no external oil supply system, thus eliminating the need for maintenance of the oil circuit of the external oil supply system and reducing costs. The pressure oil circulates in the hydraulic cylinder to prevent the pressure oil from contacting with the outside air and causing degassing inside the pressure oil. The pressure in the hydraulic cylinder is stable, thus preventing the pressure oil circuit from contacting with the outside air and causing bubbles in the oil circuit, thereby causing unstable pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a multifunctional hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] Currently in the machinery industry, the most commonly used high-pressure technology is hydraulic technology, which uses hydraulic cylinders as the power source for driving.

[0004] A traditional hydraulic cylinder includes a cylinder body, a piston and a piston rod. The cylinder body is provided with oil inlet and outlet ports. The movement of the piston and the piston rod is achieved by the inflow and outflow of pressurized oil provided by an external oil tank, and various control functions are realized through external components. However, this oil supply method will cause bubbles to exist in the pressure oil of the hydraulic cylinder's circuit. The hydraulic cylinder will experience pressure drop during the compression control process, resulting in unstable pressure in the hydraulic cylinder. In addition, the pressure oil in the oil tank will deteriorate due to long-term contact with air, which will also affect the pressure of the hydraulic cylinder. Utility Model Content

[0005] The main purpose of the utility model is to provide a multifunctional hydraulic cylinder to solve the above technical problems, thereby preventing the pressure oil from contacting with the air.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A multifunctional hydraulic cylinder comprises a cylinder housing, a pressure regulating valve, a pressure relief valve, a low-pressure one-way valve, a high-pressure one-way valve, an oil suction drive structure and a cylinder drive structure, wherein the cylinder housing comprises a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, a sixth oil circuit, a seventh oil circuit, an eighth oil circuit, a ninth oil circuit, a first oil chamber, a second oil chamber, a third oil chamber, a fourth oil chamber and a fifth oil chamber, wherein the first oil circuit is connected to the second oil circuit through the first oil chamber, the low-pressure one-way valve is installed in the first oil chamber, and the second oil circuit is connected to the third oil chamber through the second oil chamber. The oil circuits are connected, the high-pressure one-way valve is installed in the second oil chamber, the third oil circuit is connected to the fourth oil circuit, the fourth oil circuit is connected to the ninth oil circuit through the third oil chamber, the fourth oil circuit is connected to the fifth oil circuit, the sixth oil circuit and the seventh oil circuit, the ninth oil circuit is connected to the seventh oil circuit through the fourth oil chamber, the ninth oil circuit is connected to the eighth oil circuit, the pressure regulating valve is installed in the third oil chamber, the pressure relief valve is installed in the fourth oil chamber, the cylinder drive structure is installed in the cylinder housing, the fifth oil chamber is connected to the first oil chamber, and the oil suction drive structure is installed in the fifth oil chamber.

[0008] As a preferred technical solution, the oil cylinder driving structure includes an oil cylinder piston, an oil bag, an oil storage cylinder, a buffer spring and an oil cylinder cover. The oil storage cylinder is fixed in the oil cylinder housing and sleeved on the outer surface of the oil bag. The oil cylinder cover is installed on the oil cylinder housing and abuts against the oil bag. The oil cylinder piston is sleeved on the outer surface of the oil storage cylinder. The oil cylinder piston is movably arranged relative to the oil storage cylinder. The buffer spring is sleeved on the outer surface of the oil storage cylinder. One end of the buffer spring is grounded to the top of the oil cylinder piston, and the other end abuts against the oil storage cylinder. The oil storage cylinder is connected to the first oil circuit, and the sixth oil circuit is connected between the oil storage cylinder and the oil cylinder piston.

[0009] As a preferred technical solution, the cylinder drive structure also includes a return spring, which is sleeved on the outer surface of the cylinder piston. The outer surface of the cylinder piston is provided with an abutment block, one end of the return spring abuts against the abutment block, and the other end abuts against the cylinder housing.

[0010] As a preferred technical solution, the oil cylinder driving structure further includes a first oil bag pressure ring and a second oil bag pressure ring, the first oil bag pressure ring is sleeved on the outer surface of the second oil bag pressure ring, and the oil cylinder cover presses the first oil bag pressure ring.

[0011] As a preferred technical solution, the oil cylinder driving structure further includes a piston oil seal, which is embedded in the oil cylinder housing and sleeved on the outer surface of the oil cylinder piston.

[0012] As a preferred technical solution, the pressure regulating valve includes a sealing steel ball, a pressure regulating spring, a pressure regulating screw, a pressure regulating valve sleeve, a pressure regulating valve core and a sealing screw sleeve. The pressure regulating screw is installed on the sealing screw sleeve, and the pressure regulating screw and the sealing screw sleeve are threadedly connected to the cylinder housing. The pressure regulating valve sleeve is installed on the lower end of the pressure regulating screw, the pressure regulating valve core is inserted into the pressure regulating valve sleeve, the pressure regulating spring is sleeved on the pressure regulating valve core, and the two ends are respectively abutted against the pressure regulating valve sleeve and the pressure regulating valve core, and the pressure regulating valve sleeve is abutted against the sealing steel ball.

[0013] As a preferred technical solution, the oil suction drive structure includes an oil suction gear and an oil suction piston rod. The oil suction piston rod is movably arranged in the fifth oil chamber. The oil suction gear is rotatably installed on the cylinder housing. A rack is arranged at the upper end of the oil suction piston rod, and the rack is meshed with the oil suction gear.

[0014] As a preferred technical solution, the pressure relief valve includes a sealing nut, a cone valve core clamping rod and a sealing cone valve core. The cone valve core clamping rod is inserted into the fourth oil chamber and meshed with the cylinder housing. The sealing nut is sleeved on the outer surface of the cone valve core clamping rod and meshed with the cylinder housing. The sealing cone valve core is placed at the lower end of the cone valve core clamping rod.

[0015] As a preferred technical solution, the low-pressure one-way valve includes a low-pressure sealing plug, a low-pressure spring and a low-pressure sealing ball. The low-pressure sealing plug is threaded on the cylinder housing, one end of the low-pressure spring is abutted against the low-pressure sealing plug, and the other end is abutted against the low-pressure sealing ball.

[0016] The beneficial effects of the utility model are: the multifunctional hydraulic cylinder has the following advantages:

[0017] 1. There is no external oil supply system, which saves the maintenance of the oil circuit of the external oil supply system and reduces costs.

[0018] 2. The pressure oil circulates in the hydraulic cylinder to prevent the pressure oil from contacting with the outside air and causing bubbles to form inside the pressure oil.

[0019] 3. The pressure inside the hydraulic cylinder is stable, which avoids the contact between the pressure oil circuit and the outside air to cause bubbles in the oil circuit, thereby causing unstable pressure.

[0020] 4. A buffer spring and a return spring are arranged in the oil cylinder driving structure, so that the oil cylinder piston can automatically return to the original position and return to the buffer position, and no external oil pressure is required to realize the automatic return of the piston.

[0021] 5. The hydraulic cylinder has an explosion-proof function. When the cylinder piston moves beyond the stroke of the cylinder piston, the pressure oil circulates back to the oil storage cylinder through the second oil storage flow channel to reduce the pressure on the cylinder piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the multifunctional hydraulic cylinder involved in the utility model;

[0023] Figure 2 A top view of the multifunctional hydraulic cylinder involved in the utility model;

[0024] Figure 3 It is a rear view of the multifunctional hydraulic cylinder involved in the utility model;

[0025] Figure 4 for Figure 3 Sectional view of middle II;

[0026] Figure 5 for Figure 2 Cross-sectional view of CC;

[0027] Figure 6 for Figure 2 Cross-sectional view of the middle MM;

[0028] Figure 7 for Figure 2 Sectional view of OO;

[0029] Figure 8 for Figure 2 Sectional view of AA in the middle;

[0030] Fig. 9 for Figure 1 Cross-sectional view of JJ. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] like Figure 1-9 As shown, a multifunctional hydraulic cylinder includes a cylinder housing 1, a pressure regulating valve 6, a pressure relief valve 7, a low-pressure one-way valve 4, a high-pressure one-way valve 5, an oil suction drive structure 3 and a cylinder drive structure 2. The cylinder housing 1 includes a first oil circuit 111, a second oil circuit 112, a third oil circuit 113, a fourth oil circuit 114, a fifth oil circuit 115, a sixth oil circuit 116, a seventh oil circuit 117, an eighth oil circuit 118, a ninth oil circuit 119, a first oil chamber 121, a second oil chamber 122, a third oil chamber 123, a fourth oil chamber 124 and a fifth oil chamber 125. The first oil circuit 111 is connected to the second oil circuit 112 through the first oil chamber 121, the low-pressure one-way valve 4 is installed in the first oil chamber 121, and the second oil circuit 112 is connected to the third oil circuit 124 through the second oil chamber 122. 113 is connected, the high-pressure check valve 5 is installed in the second oil chamber 122, the third oil circuit 113 is connected with the fourth oil circuit 114, the fourth oil circuit 114 is connected with the ninth oil circuit 119 through the third oil chamber 123, the fourth oil circuit 114 is connected with the fifth oil circuit 115, the sixth oil circuit 116 and the seventh oil circuit 117, the ninth oil circuit 119 is connected with the seventh oil circuit 117 through the fourth oil chamber 124, and the ninth oil circuit 119 is connected with the eighth oil circuit 118, the pressure regulating valve 6 is installed in the third oil chamber 123, the pressure relief valve 7 is installed in the fourth oil chamber 114, the cylinder drive structure 2 is installed in the cylinder housing 1, the fifth oil chamber 125 is connected with the first oil chamber 121, the oil suction drive structure 3 is installed in the fifth oil chamber 125, and a pressure gauge is connected to the end of the fifth oil circuit 5.

[0033] The oil cylinder driving structure 2 includes an oil cylinder piston 21, an oil bag 23, an oil storage cylinder 22, a buffer spring 27, an oil cylinder cover 24, a return spring 28, a first oil bag pressure ring 26, a second oil bag pressure ring 25 and a piston oil seal 29. The oil storage cylinder 22 is fixedly arranged in the oil cylinder housing 21 and is sleeved on the outer surface of the oil bag 23. The oil cylinder cover 24 is installed on the oil cylinder housing and abuts against the oil bag 23 through the first oil bag pressure ring 26. The oil cylinder piston 21 is sleeved on the outer surface of the oil storage cylinder 22. The oil cylinder piston 21 is movably arranged relative to the oil storage cylinder 22. The buffer spring 27 is sleeved on the outer surface of the oil storage cylinder 22. One end of the buffer spring 27 is connected to the top of the oil cylinder piston 21, and the other end is connected to the top of the oil cylinder piston 21. The sixth oil path 116 is connected to the oil storage cylinder 22 and the cylinder piston 21. The first oil bag pressing ring 26 is sleeved on the outer surface of the second oil bag pressing ring 25 to ensure that the cylinder cover 24 can compress the oil bag 23. The return spring 28 is sleeved on the outer surface of the cylinder piston 21. The outer surface of the cylinder piston 21 is provided with an abutment block 221. One end of the return spring 28 abuts against the abutment block 221, and the other end abuts against the cylinder housing 1. The piston oil seal 29 is embedded in the cylinder housing 1, and the piston oil seal 29 is sleeved on the outer surface of the cylinder piston 21 to prevent the pressure oil in the cylinder housing 1 from overflowing. The oil storage cylinder 22 is provided with a first oil storage channel 221 and a second oil storage channel 223. The first oil storage channel 221 is connected to the first oil circuit 111, and the second oil storage channel 223 is connected to the eighth oil circuit 118. A sixth oil chamber 222 is provided between the oil cylinder piston 21 and the oil storage cylinder 22. The buffer spring 27 is provided in the sixth oil chamber 222. The sixth oil chamber 222 is connected to the sixth oil circuit 6. The upper end surface of the first oil bag pressure ring 26 and the side surface of the oil cylinder cover are respectively provided with ventilation grooves and ventilation holes 241, so that the outside air can enter the oil bag 23.

[0034] The pressure regulating valve 6 includes a sealing steel ball 66, a pressure regulating spring 65, a pressure regulating screw 64, a pressure regulating valve sleeve 63, a pressure regulating valve core 62 and a sealing screw sleeve 61. The pressure regulating screw 64 is installed on the sealing screw sleeve 61, and the pressure regulating screw 64 and the sealing screw sleeve 61 are threadedly connected to the cylinder housing 21. The pressure regulating valve sleeve 63 is installed on the lower end of the pressure regulating screw 64, the pressure regulating valve core 62 is inserted into the pressure regulating valve sleeve 63, the pressure regulating spring 65 is sleeved on the pressure regulating valve core 62, and the two ends are respectively abutted against the pressure regulating valve sleeve 63 and the pressure regulating valve core 62, and the pressure regulating valve sleeve 63 is abutted against the sealing steel ball 66, which is used to adjust the force of the cylinder piston 21.

[0035] The oil suction drive structure 3 includes an oil suction gear 31 and an oil suction piston rod 32. The oil suction piston rod 32 is movably arranged in the fifth oil chamber 125. The oil suction gear 31 is rotatably installed on the cylinder housing 1. A rack 33 is arranged on the upper end of the oil suction piston rod 32, and the rack 33 is meshed with the oil suction gear 31.

[0036] The pressure relief valve 7 includes a sealing nut 71, a cone valve core clamping rod 72, a sealing cone valve core 73 and a sealing ring 74. The cone valve core clamping rod 72 is inserted into the fourth oil chamber 124 and meshed with the cylinder housing 1. The sealing nut 71 is sleeved on the outer surface of the cone valve core clamping rod 72 and meshed with the cylinder housing 1. The sealing cone valve core 73 is placed at the lower end of the cone valve core clamping rod 72 and is used to switch the pressure of the cylinder piston 21.

[0037] The low-pressure one-way valve 4 includes a low-pressure sealing plug 41, a low-pressure spring 42 and a low-pressure sealing ball 43. The low-pressure sealing plug 41 is threadedly arranged on the cylinder housing 1. One end of the low-pressure spring 42 abuts against the low-pressure sealing plug 41, and the other end abuts against the low-pressure sealing ball 43, thereby blocking the first oil circuit 111 to separate the first oil circuit 111 and the first oil chamber 121.

[0038] The high-pressure one-way valve 5 includes a high-pressure sealing plug 51, a high-pressure spring 52 and a high-pressure sealing ball 53. The high-pressure sealing plug 51 is threadedly arranged on the cylinder housing 1. One end of the high-pressure spring 52 abuts against the high-pressure sealing plug 51, and the other end abuts against the high-pressure sealing ball 53, thereby blocking the second oil circuit 112 to separate the second oil circuit 112 and the second oil chamber 122.

[0039] When it is necessary to inject pressurized oil, the oil suction gear 31 is driven to rotate, driving the oil suction piston rod 32 to move to the bottom of the fifth oil chamber 125, and the oil cylinder piston 21 is extended and located at the maximum stroke position, so that the pressure relief valve 7, the pressure regulating valve 6, the low-pressure check valve 4 and the high-pressure check valve 5 are in the open state. After the pressurized oil is injected into the hydraulic cylinder, the piston is finally pressed to compress the pressurized oil so that the pressurized oil fills the entire cylinder oil circuit and expel the air.

[0040] When in use, close the pressure relief valve 7, adjust the pressure of the pressure regulating valve 6 to the required pressure value, place the hydraulic cylinder on the object to be acted on, drive the oil suction gear to rotate, and drive the oil suction piston rod 32 to move upward. During this action, the space of the first oil chamber 121 increases, thereby reducing the pressure in the first oil chamber 121. At this time, the pressure in the first oil chamber 121 is lower than the pressure of the oil storage cylinder 22 and the second oil chamber 122. The pressure oil in the oil storage cylinder 22 will lift the low-pressure sealing ball 43 from the first oil circuit 111, compressing the low-pressure spring 42, thereby opening the low-pressure one-way valve 4 and entering the first oil chamber 121, and the oil bag 23 will also be squeezed under the action of atmospheric pressure, so that the oil storage cylinder 22 maintains a vacuum state, and the high-pressure one-way valve 5 is in a closed state due to the pressure difference.

[0041] When the oil suction piston rod 32 moves upward to the highest point, and then the oil suction gear 31 rotates in the opposite direction, driving the oil suction piston rod 32 to move downward, the space of the first oil chamber 121 increases or decreases, and the pressure oil is squeezed to increase the pressure in the first oil chamber 121. At this time, the pressure in the first oil chamber 121 is higher than the pressure in the oil storage cylinder 22 and the second oil chamber 122. At this time, under the action of the pressure oil in the first oil chamber 121, the low-pressure one-way valve 4 is closed and the high-pressure one-way valve 5 is opened. The squeezed pressure oil enters the second oil chamber through the second oil passage 112, and then passes through the third oil passage 113 after entering the second oil chamber 122. After passing through the third oil passage 113, the pressure oil is divided into three passages. One passage enters the fourth oil passage 114 to act on the pressure regulating valve 6, one passage enters the fifth oil passage 115 to enter the pressure gauge to display the real-time pressure of the oil passage, and the last passage enters the sixth oil passage 116 and the seventh oil passage 117.

[0042] When the pressure exerted by the cylinder piston 21 on the object is lower than the set pressure, during the pressurization of the pressure oil in the closed circuit in the cylinder, the fourth oil circuit 114 and the third oil chamber 123 are blocked under the action of the pressure regulating valve 6, and the pressure oil cannot enter the third oil chamber 123; in addition, the seventh oil circuit 117 and the fourth oil chamber 124 are also blocked under the action of the pressure relief valve 7, and the pressure oil cannot enter the fourth oil chamber 124; the pressure oil enters the sixth oil chamber 222 through the sixth oil circuit 116 to act on the cylinder piston 21, and the cylinder piston 21 extends out to act on the external components under the action of the pressure oil. When the action of the cylinder piston 21 exceeds the maximum stroke, the pressure oil acting on the cylinder piston 21 enters the eighth oil circuit 118 from the second oil storage channel 223, and then returns to the oil storage cylinder 22.

[0043] When the pressure exerted by the cylinder piston 21 on the object is higher than the set pressure, during the pressurization of the pressure oil in the closed circuit in the cylinder, the high-pressure pressure oil in the fourth oil circuit 114 opens the pressure regulating valve, and the pressure oil enters the third oil chamber 123, and then enters the eighth oil circuit 118 through the ninth oil circuit 119 and the fourth oil chamber 124, and then returns to the oil storage cylinder 22. When the excess pressure is relieved, the pressure regulating spring 65 is reset, pushing the sealing steel ball 66 to block the fourth oil circuit 114, so the pressure acting on the object during the continuous pressurization process is always the pressure set by the pressure regulating valve 6.

[0044] When the pressure relief valve 7 is opened, the seventh oil circuit 117 is connected to the fourth oil chamber 124, and the hydraulic circuit forms a loop with the oil storage cylinder 22. During the pressurization process, the pressure oil enters the fourth oil chamber 124 from the seventh oil circuit 117, and then returns to the oil storage cylinder 22 through the ninth oil circuit 119 and the eighth oil circuit 118. At this time, the pressure of the hydraulic cylinder on the object disappears, and the pressure of the pressure oil on the cylinder piston 21 disappears. The cylinder piston 21 slowly resets under the action of the return spring 28 and the buffer spring 27 until the piston is in the initial position when the forces acting on the cylinder piston 21 by the return spring 28 and the buffer spring 2 are equal.

[0045] The above-described embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A multifunctional hydraulic cylinder, characterized in that: The invention comprises a cylinder housing, a pressure regulating valve, a pressure relief valve, a low-pressure one-way valve, a high-pressure one-way valve, an oil suction drive structure and a cylinder drive structure. The cylinder housing comprises a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, a sixth oil circuit, a seventh oil circuit, an eighth oil circuit, a ninth oil circuit, a first oil chamber, a second oil chamber, a third oil chamber, a fourth oil chamber and a fifth oil chamber. The first oil circuit is connected with the second oil circuit through the first oil chamber. The low-pressure one-way valve is installed in the first oil chamber. The second oil circuit is connected with the third oil circuit through the second oil chamber. , the high-pressure one-way valve is installed in the second oil chamber, the third oil circuit is connected to the fourth oil circuit, the fourth oil circuit is connected to the ninth oil circuit through the third oil chamber, the fourth oil circuit is connected to the fifth oil circuit, the sixth oil circuit and the seventh oil circuit, the ninth oil circuit is connected to the seventh oil circuit through the fourth oil chamber, and the ninth oil circuit is connected to the eighth oil circuit, the pressure regulating valve is installed in the third oil chamber, the pressure relief valve is installed in the fourth oil chamber, the cylinder drive structure is installed in the cylinder housing, the fifth oil chamber is connected to the first oil chamber, and the oil suction drive structure is installed in the fifth oil chamber.

2. The multifunctional hydraulic cylinder according to claim 1, characterized in that: The oil cylinder driving structure includes an oil cylinder piston, an oil bag, an oil storage cylinder, a buffer spring and an oil cylinder cover. The oil storage cylinder is fixed in the oil cylinder housing and sleeved on the outer surface of the oil bag. The oil cylinder cover is installed on the oil cylinder housing and abuts against the oil bag. The oil cylinder piston is sleeved on the outer surface of the oil storage cylinder. The oil cylinder piston is movably arranged relative to the oil storage cylinder. The buffer spring is sleeved on the outer surface of the oil storage cylinder. One end of the buffer spring is grounded to the top of the oil cylinder piston, and the other end abuts against the oil storage cylinder. The oil storage cylinder is connected to the first oil circuit, and the sixth oil circuit is connected between the oil storage cylinder and the oil cylinder piston.

3. The multifunctional hydraulic cylinder according to claim 2, characterized in that: The oil cylinder driving structure also includes a return spring, which is sleeved on the outer surface of the oil cylinder piston. The outer surface of the oil cylinder piston is provided with an abutment block, one end of the return spring abuts against the abutment block, and the other end abuts against the oil cylinder housing.

4. The multifunctional hydraulic cylinder according to claim 3, characterized in that: The oil cylinder driving structure also includes a first oil bag pressing ring and a second oil bag pressing ring. The first oil bag pressing ring is sleeved on the outer surface of the second oil bag pressing ring, and the oil cylinder cover presses the first oil bag pressing ring.

5. The multifunctional hydraulic cylinder according to claim 4, characterized in that: The oil cylinder driving structure also includes a piston oil seal, which is embedded in the oil cylinder housing and sleeved on the outer surface of the oil cylinder piston.

6. The multifunctional hydraulic cylinder according to claim 5, characterized in that: The pressure regulating valve includes a sealing steel ball, a pressure regulating spring, a pressure regulating screw, a pressure regulating valve sleeve, a pressure regulating valve core and a sealing screw sleeve. The pressure regulating screw is installed on the sealing screw sleeve, and the pressure regulating screw and the sealing screw sleeve are threadedly connected to the cylinder housing. The pressure regulating valve sleeve is installed on the lower end of the pressure regulating screw, the pressure regulating valve core is inserted into the pressure regulating valve sleeve, the pressure regulating spring is sleeved on the pressure regulating valve core, and the two ends are respectively abutted against the pressure regulating valve sleeve and the pressure regulating valve core, and the pressure regulating valve sleeve is abutted against the sealing steel ball.

7. The multifunctional hydraulic cylinder according to claim 5, characterized in that: The oil suction drive structure includes an oil suction gear and an oil suction piston rod. The oil suction piston rod is movably arranged in the fifth oil chamber. The oil suction gear is rotatably installed on the cylinder housing. A rack is arranged on the upper end of the oil suction piston rod, and the rack is meshed with the oil suction gear.

8. The multifunctional hydraulic cylinder according to claim 5, characterized in that: The pressure relief valve includes a sealing nut, a cone valve core clamping rod and a sealing cone valve core. The cone valve core clamping rod is inserted into the fourth oil chamber and meshed with the cylinder housing. The sealing nut is sleeved on the outer surface of the cone valve core clamping rod and meshed with the cylinder housing. The sealing cone valve core is placed at the lower end of the cone valve core clamping rod.

9. The multifunctional hydraulic cylinder according to claim 5, characterized in that: The low-pressure one-way valve includes a low-pressure sealing plug, a low-pressure spring and a low-pressure sealing ball. The low-pressure sealing plug is threadedly arranged on the cylinder housing. One end of the low-pressure spring abuts against the low-pressure sealing plug, and the other end abuts against the low-pressure sealing ball.

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