hydraulic device

Abstract

This application provides a hydraulic device, including a hydraulic cylinder, a movable component, an elastic seal, an elastic drive component, and a coil. A first end cap is located on the side of a second end cap opposite to the hydraulic cylinder. The first and second end caps are movably connected along the extension direction of the movable component. The second end cap is connected to the hydraulic cylinder. The first, second, and elastic seals are all disposed around the outer periphery of the movable component. The elastic seal is located between the first and second end caps, with one radial side abutting against the movable component and the other side abutting against one of the first and second end caps. The coil is connected to the second end cap and generates a magnetic field. The magnetic field acts on the first end cap, causing it to experience a magnetic force along the extension direction of the movable component. The elastic drive component is connected to both the first and second end caps. The elastic force exerted on the first end cap by the elastic drive component is opposite in direction to the magnetic force. Therefore, the hydraulic device provided in this application can reduce oil leakage in the hydraulic device.

Description

Technical Field

[0001] This application relates to the field of hydraulic technology, and more particularly to a hydraulic device. Background Technology

[0002] A hydraulic actuator is a hydraulically driven component that converts hydraulic energy into mechanical energy, enabling linear reciprocating motion (or oscillating motion). It is simple in structure and reliable in operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and eliminates transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic actuator is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides.

[0003] In related technologies, a hydraulic device may include a hydraulic cylinder, an end cap, a piston, and a piston rod. The end cap may be fitted over the opening of the hydraulic cylinder. The piston may be located inside the hydraulic cylinder. One end of the piston rod extends into the hydraulic cylinder through a through-hole in the end cap and connects to the piston, while the other end of the piston rod may be located outside the hydraulic cylinder. A sealing ring is provided between the piston rod and the end cap. By supplying hydraulic fluid to the hydraulic cylinder, the piston and piston rod can be moved, thereby converting hydraulic energy into mechanical energy.

[0004] However, there was significant leakage of the aforementioned oil. Summary of the Invention

[0005] In view of at least one of the above-mentioned technical problems, embodiments of this application provide a hydraulic device that can reduce oil leakage in the hydraulic device.

[0006] The embodiments of this application provide the following technical solutions:

[0007] This application provides a hydraulic device, including: a hydraulic cylinder, a movable component, an elastic seal, an elastic drive component, and a coil; one end of the hydraulic cylinder is provided with a first end cap and a second end cap, the first end cap is located on the side of the second end cap away from the hydraulic cylinder, the first end cap and the second end cap are movably connected along the extension direction of the movable component, the second end cap is connected to the hydraulic cylinder, the first end cap, the second end cap and the elastic seal are all arranged around the outer periphery of the movable component, the elastic seal is located between the first end cap and the second end cap, one radial side of the elastic seal abuts against the movable component, and the other side abuts against one of the first end cap and the second end cap; the coil is connected to the second end cap, the coil is used to generate a magnetic field, the first end cap is located in the magnetic field, the magnetic field acts on the first end cap, so that the first end cap is subjected to a magnetic force along the extension direction of the movable component, the elastic drive component is connected to the first end cap and the second end cap respectively, and the elastic force of the elastic drive component on the first end cap is opposite to the direction of the magnetic force.

[0008] The hydraulic device provided in this application embodiment may include a hydraulic cylinder, a movable component, an elastic seal, an elastic drive component, and a coil. One end of the hydraulic cylinder is provided with a first end cap and a second end cap. The first end cap is located on the side of the second end cap opposite to the hydraulic cylinder. The first and second end caps are movably connected along the extension direction of the movable component. The second end cap is connected to the hydraulic cylinder. The first end cap, the second end cap, and the elastic seal are all arranged around the outer periphery of the movable component. The elastic seal is located between the first and second end caps. One radial side of the elastic seal abuts against the movable component, and the other side abuts against one of the first and second end caps. The coil is connected to the second end cap and is used to generate a magnetic field. The first end cap is located in the magnetic field, and the magnetic field acts on the first end cap, causing it to experience a magnetic force along the extension direction of the movable component. The elastic drive component is connected to both the first and second end caps. The elastic force exerted on the first end cap by the elastic drive component is opposite in direction to the magnetic force. This configuration allows adjustment of the coil's magnetic field by regulating the coil's current, thereby adjusting the magnetic force on the first end cap. This, in turn, regulates the total force exerted by the coil and the elastic drive component on the first end cap, changing the compression ratio of the elastic seal between the first and second end caps. This, in turn, adjusts the sealing effect of the elastic seal between the moving part and the end caps (i.e., adjusting the interference fit of the elastic seal). During the outer stroke of the moving part, as it moves outward from the hydraulic cylinder, adjusting the coil current increases the compression ratio of the elastic seal, strengthening its sealing effect and reducing the amount of oil carried out of the hydraulic cylinder. During the inner stroke of the piston rod, as it moves inward from the hydraulic cylinder, adjusting the coil current decreases the compression ratio of the elastic seal, weakening its sealing effect and causing more oil carried out of the hydraulic cylinder to return, thus reducing oil leakage.

[0009] In one possible implementation, the coil is located between a first end cap and a second end cap, the first end cap comprising a ferromagnetic solid or a magnet, and the coil and the first end cap attract each other when the coil is energized.

[0010] The elastic drive member is located between the first end cover and the second end cover, and the elastic drive member is in a compressed state along the extension direction of the movable member; or, the elastic drive member is located on the side of the first end cover away from the second end cover, and the elastic drive member is in a stretched state along the extension direction of the movable member.

[0011] In one possible implementation, the coil is located between a first end cap and a second end cap, the first end cap including a magnet, and when the coil is energized, the coil and the first end cap repel each other.

[0012] The elastic drive member is located between the first end cover and the second end cover, and the elastic drive member is in a stretched state along the extension direction of the movable member; or, the elastic drive member is located on the side of the first end cover away from the second end cover, and the elastic drive member is in a compressed state along the extension direction of the movable member.

[0013] In one possible implementation, the first end cap includes a first cover body and a first protrusion connected together, and the second end cap includes a second cover body and a second protrusion connected together. The first cover body, the first protrusion, the second cover body and the second protrusion are all disposed around the outer periphery of the movable part. The first cover body is located on the side of the second cover body away from the hydraulic cylinder. The first protrusion and the second protrusion are both located between the first cover body and the second cover body, and the first protrusion and the second protrusion are nested together.

[0014] When the elastic seal is in its minimum compressed state, the first protrusion and the second cover are spaced apart along the extension direction of the movable part, and the second protrusion and the first cover are spaced apart.

[0015] In one possible implementation, the first protrusion is located inside the second protrusion, a first groove is formed between the first protrusion and the second cover, the bottom wall of the first groove is formed by the second protrusion, and the elastic seal is located in the first groove and abuts against the bottom wall and side wall of the first groove.

[0016] Alternatively, the first protrusion is fitted onto the outside of the second protrusion, and a first groove is formed between the second protrusion and the first cover. The bottom wall of the first groove is formed by the first protrusion, and the elastic seal is located in the first groove and abuts against the bottom wall and side wall of the first groove.

[0017] In one possible implementation, a second groove is provided between the first cover and the second cover, the second groove being arranged around the outer periphery of the first protrusion and the second protrusion, and the coil is located in the second groove.

[0018] In one possible implementation, a limiting member is also included, which includes a limiting portion and an insertion portion connected together, and a cross-section along the extension direction perpendicular to the moving member, wherein the cross-sectional area of ​​the limiting portion is larger than the cross-sectional area of ​​the insertion portion.

[0019] The limiting part is located on the side of the first end cover away from the second end cover, and the insertion part is inserted into the first end cover and the second end cover. The end of the insertion part near the limiting part is slidably connected to the first end cover along the extension direction of the movable part, and the end of the insertion part away from the limiting part is connected to the second end cover.

[0020] When the elastic seal is in its maximum compression state, the limiting part is spaced apart from the first end cap.

[0021] In one possible implementation, there are multiple coils, which are nested sequentially from the inside out, and the magnetic field direction of each coil is the same.

[0022] In one possible implementation, the resilient seal includes a flexible shell and a sealing spring, both of which extend circumferentially around the movable member, with the flexible shell located on either side of the sealing spring along the radial direction of the movable member.

[0023] In one possible implementation, the system further includes a piston, with both the first and second end caps having through holes, a cylinder cavity in the hydraulic cylinder, the through holes communicating with the cylinder cavity, the piston located in the cylinder cavity, and a movable member inserted into the through holes of the first and second end caps, one end of the movable member located in the cylinder cavity and connected to the piston.

[0024] The structure of this application, as well as its other inventive objectives and beneficial effects, will become more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the hydraulic device provided in the embodiments of this application;

[0027] Figure 2 A cross-sectional view of the hydraulic device for removing the coil assembly provided in an embodiment of this application;

[0028] Figure 3 A partial exploded view of the hydraulic device provided in an embodiment of this application;

[0029] Figure 4 A partial half-sectional view of the hydraulic device provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram showing the disassembled elastic seal provided in the embodiments of this application;

[0031] Figure 6 A cross-sectional view of a coil assembly provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100: Hydraulic device; 110: Hydraulic cylinder; 111: Cylinder cavity;

[0034] 1111: First cylindrical cavity; 1112: Second cylindrical cavity; 112: Cylindrical body;

[0035] 113: Protective cover; 1141: First opening; 1142: Second opening;

[0036] 121: Moving part; 122: Piston; 123: Fastener;

[0037] 124: Seal; 130: Elastic seal; 131: Flexible shell;

[0038] 132: Sealing spring; 140: Elastic actuator; 150: Coil assembly;

[0039] 151: Coil; 152: Support component; 1521: First support component;

[0040] 1522: Second support member; 160: End cap; 161: First end cap;

[0041] 1611: First cover; 1612: First protrusion; 162: Second end cap;

[0042] 1621: Second cover; 1622: Second protrusion; 160a: Through hole;

[0043] 171: First groove; 172: Second groove; 180: Limiting element;

[0044] 181: Limiting part; 182: Insertion part. Detailed Implementation

[0045] In related technologies, a hydraulic device may include a hydraulic cylinder, an end cap, a piston, and a piston rod. The end cap may be placed over the opening of the hydraulic cylinder and is fixedly connected to the hydraulic cylinder by bolts. The piston is located inside the hydraulic cylinder, and one end of the piston rod extends into the hydraulic cylinder through a through hole in the end cap and connects to the piston, while the other end of the piston rod is located outside the hydraulic cylinder. A sealing ring is provided between the piston rod and the end cap. By supplying oil to the hydraulic cylinder, the piston and piston rod can be moved to convert hydraulic energy into mechanical energy. Factors affecting the sealing effect of the sealing ring mainly include the compression ratio (i.e., the degree to which the sealing ring is compressed after assembly), the width of the sealing groove accommodating the sealing ring, and the hardness of the sealing ring.

[0046] However, once the sealing ring is installed in the sealing groove, its compression ratio and radially movable space along the piston rod are already determined, meaning the sealing effect of the sealing ring is fixed. During the outer stroke of the piston rod, as it moves out of the hydraulic cylinder, some of the oil adsorbed on the piston rod is carried out. To reduce the amount of oil carried out, the sealing effect of the sealing ring can be set to be stronger. During the inner stroke of the piston rod, as it moves into the hydraulic cylinder, the sealing strength between the piston rod and the end cap is consistent with the outer stroke, making it difficult for the oil carried out of the hydraulic cylinder to be brought back into the hydraulic cylinder, thus causing more oil leakage. Furthermore, when the sealing effect of the sealing ring is poor, it must be replaced, which is time-consuming and labor-intensive.

[0047] Based on at least one of the above-mentioned technical problems, embodiments of this application provide a hydraulic device, which may include a hydraulic cylinder, a movable component, an elastic seal, an elastic drive component, and a coil; one end of the hydraulic cylinder is provided with a first end cap and a second end cap, the first end cap being located on the side of the second end cap away from the hydraulic cylinder, the first end cap and the second end cap being movably connected along the extension direction of the movable component, the second end cap being connected to the hydraulic cylinder, the first end cap, the second end cap and the elastic seal are all surrounding the outer periphery of the movable component, the elastic seal is located between the first end cap and the second end cap, one radial side of the elastic seal abuts against the movable component, and the other side abuts against one of the first end cap and the second end cap; the coil is connected to the second end cap, the coil is used to generate a magnetic field, the first end cap is located in the magnetic field, the magnetic field acts on the first end cap, so that the first end cap is subjected to a magnetic force along the extension direction of the movable component, the elastic drive component is connected to the first end cap and the second end cap respectively, and the elastic force of the elastic drive component on the first end cap is opposite to the direction of the magnetic force. This configuration allows adjustment of the coil's magnetic field by regulating the coil's current, thereby adjusting the magnetic force on the first end cap. This, in turn, regulates the total force exerted by the coil and the elastic drive component on the first end cap, changing the compression ratio of the elastic seal between the first and second end caps. This, in turn, adjusts the sealing effect of the elastic seal between the moving part and the end caps (i.e., adjusting the interference fit of the elastic seal). During the outer stroke of the moving part, as it moves outward from the hydraulic cylinder, adjusting the coil current increases the compression ratio of the elastic seal, strengthening its sealing effect and reducing the amount of oil carried out of the hydraulic cylinder. During the inner stroke of the piston rod, as it moves inward from the hydraulic cylinder, adjusting the coil current decreases the compression ratio of the elastic seal, weakening its sealing effect and causing more oil carried out of the hydraulic cylinder to return, thus reducing oil leakage.

[0048] In addition, when the sealing effect of the elastic seal is poor, the compression ratio of the elastic seal can be increased by adjusting the current of the coil. This can improve the sealing effect without replacing the elastic seal, extend its service life, and save time and labor costs.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] The following will combine Figures 1-6 The hydraulic device 100 provided in the embodiments of this application will be described.

[0051] See Figure 1 and Figure 2 The hydraulic device 100 provided in this application embodiment may include a hydraulic cylinder 110, which may have a cavity 111. The hydraulic cylinder 110 may have a first orifice 1141 and a second orifice 1142, both of which can communicate with the cavity 111. Oil can pass through the first orifice 1141 and the second orifice 1142. The hydraulic device 100 may also include a piston 122, which may be located in the cavity 111. The piston 122 can divide the cavity 111 into a first cavity 1111 and a second cavity 1112. The first orifice 1141 can communicate with the first cavity 1111, and the second orifice 1142 can communicate with the second cavity 1112. The piston 122 is pushed to move within the cavity 111 by the pressure difference of the oil supplied to the first cavity 1111 and the second cavity 1112, thereby driving the movable part 121 connected to the piston 122 to move. When the piston 122 moves in the cylinder cavity 111, the volumes of the first cylinder cavity 1111 and the second cylinder cavity 1112 will change.

[0052] For example, see Figure 1 and Figure 2One end of the hydraulic cylinder 110 may be provided with an end cap 160. The hydraulic cylinder 110 may include a cylinder body 112 and a protective cover 113. The end cap 160 may cover one end of the cylinder body 112, and the protective cover 113 may cover the other end of the cylinder body 112. The hydraulic device 100 may include a movable member 121. One end of the movable member 121 may pass through the end cap 160 and extend into the cylinder cavity 111 to connect with the piston 122. The other end of the movable member 121 may be located outside the hydraulic cylinder 110 to achieve cooperation with external structural components. The piston 122 may be fixed to the movable member 121 by fasteners 123. A plurality of seals 124 are provided on the outer periphery of the piston 122, which can be used to seal between the piston 122 and the hydraulic cylinder 110.

[0053] The end cap 160 provided in the embodiments of this application will be described below.

[0054] For example, see Figure 2 and Figure 3 The end cap 160 may include a first end cap 161 and a second end cap 162, wherein the first end cap 161 may be located on the side of the second end cap 162 opposite to the hydraulic cylinder 110. The first end cap 161 and the second end cap 162 may be along the extending direction of the movable member 121 (i.e., Figure 2 The first end cover 161 is connected to the second end cover 162 in the direction A), and the second end cover 162 is connected to the hydraulic cylinder 110. That is, the first end cover 161 can move towards or away from the second end cover 162 along the extension direction of the movable member 121. Here, direction A is also the travel direction of the movable member 121.

[0055] For example, see Figure 2 and Figure 3 Both the first end cap 161 and the second end cap 162 can be arranged around the outer periphery of the movable member 121. Both the first end cap 161 and the second end cap 162 can have through holes 160a, which can communicate with the cylindrical cavity 111. The movable member 121 can be inserted into the through holes 160a of the first end cap 161 and the second end cap 162, so that the movable member 121 extends into the cylindrical cavity 111 after passing through the through holes 160a, so as to connect with the piston 122.

[0056] For example, see Figure 2 and Figure 3The first end cap 161 may include a first cover body 1611 and a first protrusion 1612 connected together, and the second end cap 162 may include a second cover body 1621 and a second protrusion 1622 connected together. The first cover body 1611, the first protrusion 1612, the second cover body 1621, and the second protrusion 1622 may all surround the outer periphery of the movable member 121. The first cover body 1611 may be located on the side of the second cover body 1621 opposite to the hydraulic cylinder 110, and the first protrusion 1612 and the second protrusion 1622 may both be located between the first cover body 1611 and the second cover body 1621, and the first protrusion 1612 and the second protrusion 1622 are nested together.

[0057] For example, when the elastic seal 130 is in the minimum compression state (i.e., the compression ratio is at its minimum), along the extension direction of the movable member 121, the first protrusion 1612 and the second cover 1621 can be spaced apart, and the second protrusion 1622 and the first cover 1611 can be spaced apart, so that the first end cover 161 can move toward the second end cover 162 to increase the compression of the elastic seal 130, increase the compression ratio of the elastic seal 130, and thus increase the sealing effect.

[0058] For example, see Figure 2 The first protrusion 1612 can be located inside the second protrusion 1622. A first groove 171 is formed between the first protrusion 1612 and the second cover 1621. The bottom wall of the first groove 171 is formed by the second protrusion 1622, and the side wall of the first groove 171 is formed by the first protrusion 1612 and the second cover 1621. The elastic seal 130 can be located in the first groove 171 and abuts against the bottom wall and side wall of the first groove 171. When the distance between the first protrusion 1612 and the second cover 1621 changes, that is, when the groove width of the first groove 171 changes, the compression ratio of the elastic seal 130 can be changed, thereby changing the sealing effect of the elastic seal 130 on the moving part 121 and the end cap 160.

[0059] For example, the first protrusion 1612 can be sleeved on the outside of the second protrusion 1622. A first groove 171 can be formed between the second protrusion 1622 and the first cover 1611. The bottom wall of the first groove 171 can be formed by the first protrusion 1612, and the side walls of the first groove 171 can be formed by the second protrusion 1622 and the first cover 1611. The elastic seal 130 can be located in the first groove 171 and abut against the bottom wall and side walls of the first groove 171. When the distance between the second protrusion 1622 and the first cover 1611 changes, that is, the groove width of the first groove 171 changes, the compression ratio of the elastic seal 130 can be changed, thereby changing the sealing effect of the elastic seal 130 on the movable member 121 and the end cap 160.

[0060] The size of the elastic seal 130 can be larger than the size of the first groove 171. The elastic seal 130 can be in a compressed state to achieve an interference fit. The degree of compression and sealing effect can be changed by the deformation of the elastic seal 130 under force, thereby adjusting the amount of sealing interference.

[0061] For example, see Figure 2 and Figure 4 A second groove 172 may be provided between the first cover 1611 and the second cover 1621, and the second groove 172 may be arranged around the outer periphery of the first protrusion 1612 and the second protrusion 1622. The second groove 172 may be used to accommodate the coil assembly 150, thereby helping to reduce the size of the hydraulic device 100.

[0062] The following describes the limiting member provided in the embodiments of this application in line 180.

[0063] For example, see Figure 2 The hydraulic device 100 may further include a limiting member 180, which may include a connected limiting portion 181 and an insertion portion 182. The cross-sectional area of ​​the limiting portion 181 along a section perpendicular to the extending direction of the movable member 121 may be larger than the cross-sectional area of ​​the insertion portion 182. The limiting portion 181 may be located on the side of the first end cap 161 opposite to the second end cap 162. The limiting portion 181 may be used to limit the maximum displacement of the first end cap 161 in a direction away from the second end cap 162. For example, when the resilient seal 130 is in its minimum compressed state, the limiting portion 181 may abut against the first end cap 161. When the resilient seal 130 is in its maximum compressed state, the limiting portion 181 may be spaced apart from the first end cap 161, thereby allowing the first end cap 161 to move in a direction away from the second end cap 162 to reduce the compression of the resilient seal 130, thereby reducing the compression ratio of the resilient seal 130 and weakening the sealing effect.

[0064] For example, see Figure 2 The insertion part 182 can be inserted into the first end cover 161 and the second end cover 162. The end of the insertion part 182 near the limiting part 181 can be slidably connected to the first end cover 161 along the extension direction of the movable member 121, and the end of the insertion part 182 away from the limiting part 181 can be connected to the second end cover 162, thereby realizing the movable connection between the first end cover 161 and the second end cover 162 along the extension direction of the movable member 121.

[0065] For example, there can be multiple limiting members 180, which can be spaced apart on the outer periphery of the movable member 121 to improve the connection effect between the limiting members 180 and the second end cap 162, as well as the limiting effect of the limiting members 180 on the first end cap 161. For example, the limiting member 180 may include a bolt.

[0066] The following describes the elastic seal 130 provided in the embodiments of this application.

[0067] See Figure 2 and Figure 3 The hydraulic device 100 may include an elastic seal 130, which may surround the outer periphery of the movable member 121. One radial side of the elastic seal 130 abuts against the movable member 121, and the other side abuts against one of the first end cap 161 and the second end cap 162, for example, against the bottom wall of the first groove 171, thereby achieving a seal between the movable member 121 and the end cap 160. The elastic seal 130 may be located between the first end cap 161 and the second end cap 162. When the first end cap 161 moves along the extension direction of the movable member 121, the groove width of the first groove 171 between the first end cap 161 and the second end cap 162 can be adjusted, thereby adjusting the compression ratio of the elastic seal 130 to adjust the sealing effect of the elastic seal 130.

[0068] For example, see Figure 3 and Figure 5 The elastic seal 130 may include a flexible shell 131 and a sealing spring 132, both of which extend circumferentially around the movable member 121. The flexible shell 131 may be located on both sides of the sealing spring 132 along the radial direction of the movable member 121. The elastic seal 130 can abut against the movable member 121 and the end cap 160 through the flexible shell 131. The flexible shell 131 has greater flexibility, resulting in a better sealing effect between the flexible shell 131 and the movable member 121, and between the flexible shell 131 and the end cap 160. The sealing spring 132 can produce elastic deformation along the extension direction and radial direction of the movable member 121. When the first end cap 161 moves away from the second end cap 162, the compression ratio of the elastic seal 130 decreases, which can weaken the sealing effect of the elastic seal 130. When the first end cap 161 moves closer to the second end cap 162, the compression ratio of the elastic seal 130 increases, which can enhance the sealing effect of the elastic seal 130. For example, the cross-sectional shape of the flexible shell 131 along the extension direction of the movable member 121 can be U-shaped, so that the sealing spring 132 can be inserted into the flexible shell 131 from the opening of the flexible shell 131.

[0069] For example, the sealing spring 132 can be made of metal, and the flexible shell 131 can be made of plastic.

[0070] The following describes the elastic drive element 140 and coil 151 provided in the embodiments of this application.

[0071] For example, see Figure 2 and Figure 3The hydraulic device 100 may further include an elastic drive member 140. The elastic force of the elastic drive member 140 can be used to drive the first end cover 161 to move towards or away from the second end cover 162, thereby adjusting the compression ratio of the elastic seal 130 and thus adjusting the sealing effect on the movable member 121 and the end cover 160. The elastic drive member 140 may be connected to the first end cover 161 and the second end cover 162 respectively. The connection in this embodiment may include a fixed connection, a detachable connection, or an abutment, etc. Taking a fixed connection as an example, it may be a direct fixed connection or an indirect fixed connection. When the coil 151 is de-energized, the elastic drive member 140 can drive the first end cover 161 to reset.

[0072] The elastic drive component 140 may include a spring, a sheet, etc. The material of the elastic drive component 140 may be a metal material. Taking the elastic drive component 140 as a spring as an example, when the elastic drive component 140 is in a compressed state, the structure of the elastic drive component 140 and the structure of the sealing spring 132 may be the same or different.

[0073] For example, see Figure 3 and Figure 4 The hydraulic device 100 may further include a coil assembly 150, which may include a coil 151 connected to the second end cap 162. The coil 151 can generate a magnetic field, in which the first end cap 161 can be located. The magnetic field can act on the first end cap 161, subjecting it to a magnetic force along the extension direction of the movable member 121. The magnetic force can be used to drive the first end cap 161 toward or away from the second end cap 162 to adjust the compression ratio of the resilient seal 130, thereby adjusting the sealing effect on the movable member 121 and the end cap 160.

[0074] In this design, the elastic force and magnetic force exerted by the elastic drive member 140 on the first end cap 161 can be opposite in direction. The magnetic field of the coil 151 can be adjusted by regulating the current, thereby regulating the magnetic force on the first end cap 161. This, in turn, regulates the total force exerted by the coil 151 and the elastic drive member 140 on the first end cap 161, controlling the compression and relaxation between the first end cap 161 and the second end cap 162. This changes the compression ratio of the elastic seal 130 between the first end cap 161 and the second end cap 162, thus adjusting the sealing effect of the elastic seal 130 between the movable member 121 and the end cap 160. During the outward stroke of the movable member 121, as it moves outward from the hydraulic cylinder 110, the compression ratio of the elastic seal 130 can be increased by adjusting the current in the coil 151, enhancing the sealing effect of the elastic seal 130 and reducing the amount of oil carried out of the hydraulic cylinder 110 by the movable member 121. During the inner stroke of piston 122, the compression ratio of elastic seal 130 can be reduced by adjusting the current of coil 151, thereby weakening the sealing effect of elastic seal 130. This allows more oil that has been carried out of hydraulic cylinder 110 to be brought back into hydraulic cylinder 110, thus reducing oil leakage. In other words, the interference fit of elastic seal 130 can be adjusted in real time according to the stroke direction to change the interference fit of moving part 121, achieving different interference fits and sealing effects at different strokes.

[0075] In addition, when the sealing effect of the elastic seal 130 is poor, the compression ratio of the elastic seal 130 can be increased by adjusting the current of the coil 151. This can improve the sealing effect without replacing the elastic seal 130 and extend the service life of the elastic seal 130, thereby saving time and labor costs.

[0076] In other examples, the direction of the magnetic field can be adjusted by changing the direction of the current in coil 151, thus meeting more applicable scenarios. Specifically, the required magnetic force magnitude and direction can be easily adjusted by changing the magnitude and direction of the current.

[0077] For example, see Figure 2 and Figure 4The coil 151 can be located between the first end cap 161 and the second end cap 162, for example, the coil 151 can be located in the second groove 172. The first end cap 161 can include a ferromagnetic solid or a magnet. When the coil 151 is energized, the coil 151 can attract the first end cap 161, thereby providing a magnetic force to the first end cap 161 toward the second end cap 162. For example, the elastic drive member 140 can be located between the first end cap 161 and the second end cap 162. The elastic drive member 140 is in a compressed state along the extension direction of the movable member 121, thereby providing a thrust to the first end cap 161 away from the second end cap 162, so that the elastic force of the elastic drive member 140 on the first end cap 161 is opposite to the direction of the magnetic force, so as to adjust the sealing effect of the elastic seal 130 between the movable member 121 and the end cap 160, thereby reducing oil leakage. Alternatively, for example, the elastic drive member 140 may be located on the side of the first end cap 161 away from the second end cap 162. The elastic drive member 140 may be in a stretched state along the extension direction of the movable member 121, thereby providing a pulling force to the first end cap 161 away from the second end cap 162, so that the elastic force of the elastic drive member 140 on the first end cap 161 is opposite to the direction of the magnetic force, thereby reducing the leakage of oil.

[0078] For example, ferromagnetic solids can include elements such as iron, nickel, and cobalt, as well as their alloys and compounds. Ferromagnetic solids are substances that are not inherently magnetic, but can be magnetized and acquire magnetic properties under the influence of a magnetic field.

[0079] For example, see Figure 2 and Figure 4 The coil 151 can be located between the first end cap 161 and the second end cap 162. The first end cap 161 may include a magnet. When the coil 151 is energized, it can repel the first end cap 161, thereby providing a magnetic force to the first end cap 161 away from the second end cap 162. For example, the elastic drive member 140 can be located between the first end cap 161 and the second end cap 162. The elastic drive member 140 is in a stretched state along the extension direction of the movable member 121, thereby providing a pulling force to the first end cap 161 toward the second end cap 162. Alternatively, for example, the elastic drive member 140 can be located on the side of the first end cap 161 away from the second end cap 162. The elastic drive member 140 is in a compressed state along the extension direction of the movable member 121, thereby providing a pushing force to the first end cap 161 toward the second end cap 162. The principle has been explained and will not be repeated here.

[0080] In other examples, coil 151 can also be located in other positions. For example, when coil 151 is located on the side of the first end cap 161 away from the second end cap 162, and coil 151 and the first end cap 161 attract each other, the principle is similar to that when coil 151 is located between the first end cap 161 and the second end cap 162, and coil 151 and the first end cap 161 repel each other, and will not be described further. When coil 151 is located on the side of the first end cap 161 away from the second end cap 162, and coil 151 and the first end cap 161 repel each other, the principle is similar to that when coil 151 is located between the first end cap 161 and the second end cap 162, and coil 151 and the first end cap 161 attract each other, and will not be described further.

[0081] In an embodiment where the elastic drive member 140 is located between the first end cap 161 and the second end cap 162, when the first protrusion 1612 is located inside the second protrusion 1622, the elastic drive member 140 may be located between the second protrusion 1622 and the first cap 1611; or, when the first protrusion 1612 is located outside the second protrusion 1622, the elastic drive member 140 may be located between the first protrusion 1612 and the second cap 1621; or, the elastic drive member 140 may be located in the second groove 172; or, the elastic drive member 140 may be located in other positions.

[0082] For example, see Figure 4 and Figure 6 The coil 151 can be any number of one, two, three, or more than three. When there are multiple coils 151, they can be nested sequentially from the inside out, which helps to reduce the overall volume of the coils 151. The magnetic field direction of each coil 151 can be the same, and multiple coils 151 can significantly increase the upper limit of electromagnetic force compared to a single coil 151. For example, multiple coils 151 can be connected in parallel, and the winding direction and current direction of each coil 151 can be the same. The number of turns, current magnitude, etc., of any two coils 151 can be the same or different.

[0083] For example, see Figure 4 and Figure 6 The coil assembly 150 may include a support member 152, which may include a first support member 1521 and a plurality of annular second support members 1522. The plurality of second support members 1522 are sequentially sleeved from the inside to the outside, and one axial end of each of the plurality of second support members 1522 is connected to the first support member 1521. A coil 151 may be disposed between two adjacent second support members 1522, and the coil 151 may be located on the surface of one of the two adjacent second support members 1522.

[0084] The electromagnetic force of coil 151 drives the first end cap 161 to move closer to the second end cap 162 (i.e., Figure 1 (Moving downwards), the elastic drive member 140 drives the first end cap 161 to move away from the second end cap 162 (i.e., moving downwards). Figure 1 Taking the upward movement as an example, the working principle of the elastic seal 130 is as follows: During the outer stroke, the coil 151 is energized, generating an electromagnetic force that causes the first end cover 161 to move downward, squeezing the elastic seal 130 and causing it to deform. The elastic seal 130 extends radially, making the contact between the elastic seal 130 and the moving part 121 tighter, enhancing the sealing effect, and reducing the oil carried out by the moving part 121 during the outer stroke. During the inner stroke, the coil 151 is de-energized, causing the electromagnetic force that caused the first end cover 161 to move downward disappear. The first end cover 161 is only subjected to the rebound force of the elastic drive member 140, which causes the first end cover 161 to move upward until it contacts the limiting part 181, allowing the first end cover 161 to return to its original position. The elastic seal 130 returns to its original shape, and the sealing effect of the elastic seal 130 is weakened. This can increase the oil carried back by the moving part 121 during the inner stroke, thereby reducing oil leakage and better protecting the hydraulic device 100 and extending its service life.

[0085] It should be noted that the numerical values ​​and ranges involved in the embodiments of this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A hydraulic device, characterized in that, include: Hydraulic cylinder, moving parts, limiting parts, elastic seals, elastic drive parts, and coils; One end of the hydraulic cylinder is provided with a first end cap and a second end cap. The first end cap is located on the side of the second end cap opposite to the hydraulic cylinder. The first end cap and the second end cap are movably connected along the extension direction of the movable component. The second end cap is connected to the hydraulic cylinder. The first end cap, the second end cap, and the elastic seal are all disposed around the outer periphery of the movable part. The elastic seal is located between the first end cap and the second end cap. One radial side of the elastic seal abuts against the movable part, and the other side abuts against one of the first end cap and the second end cap. The coil is connected to the second end cap and is used to generate a magnetic field. The first end cap is located in the magnetic field and the magnetic field acts on the first end cap so that the first end cap is subjected to a magnetic force along the extension direction of the movable member. The elastic drive member is connected to the first end cap and the second end cap respectively, and the elastic force of the elastic drive member on the first end cap is opposite to the direction of the magnetic force. The first end cap includes a first cover body and a first protrusion connected together, and the second end cap includes a second cover body and a second protrusion connected together; When the elastic seal is in its minimum compressed state, along the extension direction of the movable member, the first protrusion is spaced apart from the second cover, and the second protrusion is spaced apart from the first cover. The limiting member includes a limiting part and an inserting part connected together. The cross-sectional area of ​​the limiting part is larger than the cross-sectional area of ​​the inserting part along the extension direction perpendicular to the moving part. When the elastic seal is in its maximum compressed state, the limiting part is spaced apart from the first end cap.

2. The hydraulic device according to claim 1, characterized in that, The coil is located between the first end cap and the second end cap. The first end cap includes a magnet. When the coil is energized, the coil and the first end cap attract each other. The elastic drive member is located between the first end cap and the second end cap, and the elastic drive member is in a compressed state along the extension direction of the movable member; Alternatively, the elastic drive member is located on the side of the first end cover away from the second end cover, and the elastic drive member is in a stretched state along the extension direction of the movable member.

3. The hydraulic device according to claim 1, characterized in that, The coil is located between the first end cap and the second end cap. The first end cap includes a magnet. When the coil is energized, the coil and the first end cap repel each other. The elastic drive member is located between the first end cap and the second end cap, and the elastic drive member is in a stretched state along the extension direction of the movable member; Alternatively, the elastic drive member is located on the side of the first end cover away from the second end cover, and the elastic drive member is in a compressed state along the extension direction of the movable member.

4. The hydraulic device according to any one of claims 1-3, characterized in that, The first cover, the first protrusion, the second cover, and the second protrusion are all arranged around the outer periphery of the movable part. The first cover is located on the side of the second cover away from the hydraulic cylinder. The first protrusion and the second protrusion are both located between the first cover and the second cover, and the first protrusion and the second protrusion are nested together.

5. The hydraulic device according to claim 4, characterized in that, The first protrusion is located inside the second protrusion, and a first groove is formed between the first protrusion and the second cover. The bottom wall of the first groove is formed by the second protrusion, and the elastic seal is located in the first groove and abuts against the bottom wall and side wall of the first groove. Alternatively, the first protrusion is sleeved on the outside of the second protrusion, and a first groove is formed between the second protrusion and the first cover. The bottom wall of the first groove is formed by the first protrusion, and the elastic seal is located in the first groove and abuts against the bottom wall and side wall of the first groove.

6. The hydraulic device according to claim 4, characterized in that, A second groove is provided between the first cover and the second cover, the second groove is arranged around the outer periphery of the first protrusion and the second protrusion, and the coil is located in the second groove.

7. The hydraulic device according to any one of claims 1-3, characterized in that, The limiting part is located on the side of the first end cover away from the second end cover. The inserting part is inserted into the first end cover and the second end cover. The end of the inserting part near the limiting part is slidably connected to the first end cover along the extension direction of the movable member. The end of the inserting part away from the limiting part is connected to the second end cover.

8. The hydraulic device according to any one of claims 1-3, characterized in that, The coils are multiple, and the multiple coils are nested sequentially from the inside to the outside, and the magnetic field direction of each coil is the same.

9. The hydraulic device according to any one of claims 1-3, characterized in that, The elastic seal includes a flexible shell and a sealing spring, both of which extend circumferentially around the movable member. The flexible shell is located on both sides of the sealing spring along the radial direction of the movable member.

10. The hydraulic device according to any one of claims 1-3, characterized in that, It also includes a piston, the first end cap and the second end cap both have through holes, the hydraulic cylinder has a cylinder cavity, the through holes communicate with the cylinder cavity, the piston is located in the cylinder cavity, the movable member is inserted into the through holes of the first end cap and the second end cap, one end of the movable member is located in the cylinder cavity and connected to the piston.

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