Hydraulic cylinder

Abstract

The utility model provides a hydraulic cylinder which comprises a hydraulic cylinder body, a spring lock assembly and a clamping key, wherein the spring lock assembly and the clamping key are arranged on the hydraulic cylinder body. A cylinder cover is arranged at the end, where the piston rod extends out, of a cylinder body of the hydraulic cylinder body and provided with a stepped groove used for containing the spring lock assembly. The spring lock assembly comprises a base connected into the cylinder cover, at least one spring arranged on the base in a sleeving mode in the horizontal direction and an ejector head arranged on the spring in a sleeving mode in the horizontal direction, a part of the ejector head protrudes out of the inner wall of the cylinder cover, and the ejector head compresses the spring and is limited by the stepped groove. The clamping key is arranged at the extending end of a piston rod of the hydraulic cylinder body and is in sliding fit with the ejector head to further compress the spring and pass through the spring lock assembly when retracting to the spring lock assembly along with the piston rod, and the spring resets after the clamping key passes through the spring lock assembly, so that the ejector head protrudes out of the inner wall of the cylinder cover again and is clamped by the clamping key. The piston rod is prevented from falling out under the action of self weight.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a 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] During the installation of the hydraulic cylinder, it is necessary to open the plugging piece of the oil port and then connect the inlet and outlet oil pipes. During this process, if the rod head of the hydraulic cylinder piston rod is facing downward, the piston rod will extend under the action of its own weight. Due to the limited installation space, the installation of the hydraulic cylinder may be affected at the least, and the machinery below the hydraulic cylinder may be crushed or the personal safety of the installer below may be affected at the worst. Utility Model Content

[0004] The utility model aims to provide a hydraulic cylinder to solve the technical problem that the piston rod of the hydraulic cylinder is easy to fall out under the action of its own weight when the rod head of the piston rod of the hydraulic cylinder is installed downward.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The present application provides a hydraulic cylinder, which comprises:

[0007] A hydraulic cylinder body, comprising a cylinder body and a piston rod connected to a piston disposed in the cylinder body so as to reciprocate relative to the cylinder body, wherein one end of the cylinder body for the piston rod to extend out is provided with a cylinder cover, and the cylinder cover is provided with a stepped groove for accommodating the spring lock assembly;

[0008] A spring lock assembly, comprising a base connected to the cylinder cover, at least one spring sleeved on the base in a horizontal direction, and a head sleeved on the spring in a horizontal direction, a portion of the head protruding from the inner wall of the cylinder cover, and the head compresses the spring and is limited by the stepped groove;

[0009] A key is arranged at the protruding end of the piston rod. When the piston rod retracts and reaches the spring lock assembly, the key slides with the top head to further compress the spring and pass through the spring lock assembly. After the key passes through the spring lock assembly, the spring is reset so that the top head protrudes out of the inner wall of the cylinder cover again and is then stuck by the key.

[0010] In some embodiments of the present application, the top head includes a first top head part and a second top head part protruding from the first top head part in a horizontal direction, the vertical cross-section of the second top head part is a trapezoid, and the second top head part protrudes from the inner wall of the cylinder head; the key includes a first key part and a second key part vertically connected to the first key part, the first key part has a first inclined surface and a second inclined surface arranged opposite to each other, and the first inclined surface and the second inclined surface can be slidably matched with the second top head part.

[0011] In some embodiments of the present application, an internal thread is provided in the stepped groove, and the base includes a first base part and a second base part protruding horizontally from the first base part, the first base part is connected to the stepped groove through the internal thread, and the second base part is sleeved in the spring.

[0012] In some embodiments of the present application, the vertical cross-sections of the first portion of the base and the first portion of the top are in the shape of a "X", and both the first portion of the base and the first portion of the top are limited by the stepped groove.

[0013] In some embodiments of the present application, the second portion of the key is fixed to the piston rod via a shaft wire retaining ring.

[0014] In some embodiments of the present application, the first portion of the base is a screw plug, and the screw plug is screwed into the stepped groove via threads.

[0015] In some embodiments of the present application, the spring is a disc spring.

[0016] In some embodiments of the present application, the number of the springs is selected according to the deadweight of the piston rod.

[0017] In some embodiments of the present application, the piston rod includes a rod body and a rod head connected to the rod body, and a rod diameter of the rod head gradually decreases from the rod body outward.

[0018] The utility model provides a hydraulic cylinder, which comprises a hydraulic cylinder body, and a spring lock assembly and a clamping key arranged on the hydraulic cylinder body. A cylinder body of the hydraulic cylinder body is provided with a cylinder cover at one end for the piston rod to extend, and the cylinder cover is provided with a stepped groove for accommodating the spring lock assembly; the spring lock assembly comprises a base connected to the cylinder cover, at least one spring sleeved on the base in a horizontal direction, and a head sleeved on the spring in a horizontal direction, a part of the head protruding from the inner wall of the cylinder cover, and the head compresses the spring and is limited by the stepped groove; the clamping key is arranged at the extended end of the piston rod of the hydraulic cylinder body, and the clamping key slides with the head when the piston rod retracts and reaches the spring lock assembly to further compress the spring and pass through the spring lock assembly, and after the clamping key passes through the spring lock assembly, the spring resets so that the head protrudes from the inner wall of the cylinder cover again and is then clamped by the clamping key, so as to prevent the piston rod from falling out under the action of its own weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0020] Figure 1 It is an axial cross-sectional view of an embodiment of the hydraulic cylinder provided in the present application.

[0021] Figure 2 yes Figure 1 A magnified axial section of part A.

[0022] Figure 3 yes Figure 2 Axial cross-sectional view of the piston rod self-locking structure.

[0023] The following are the descriptions of the reference numerals:

[0024] 10. Cylinder body; 11. Piston; 12. Piston rod; 121. Rod body; 122. Rod head; 13. Cylinder head; 131. Step groove; 132. First step; 133. Second step; 20. Key; 21. First part of key; 211. First inclined surface; 212. Second inclined surface; 213. Parallel surface; 22. Second part of key; 23. Wire retaining ring for shaft; 30. Spring lock assembly; 31. Base; 311. First part of base; 312. Second part of base; 32. Spring; 33. Top; 331. First part of top; 332. Second part of top. DETAILED DESCRIPTION

[0025] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0026] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0027] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0028] For ease of understanding and explanation, it is now stipulated Figure 1 The X direction is the horizontal direction, and the Y direction is the vertical direction.

[0029] See also Figure 1 The present application provides a piston rod self-locking structure, which is installed on a hydraulic cylinder and is used for a hydraulic cylinder that is vertically installed and has a piston rod 12 extending downward, and plays a locking role on the piston rod 12. The piston rod self-locking structure includes a hydraulic cylinder body, a spring lock assembly 30 installed on the hydraulic cylinder body, and a key 20.

[0030] The main body of the hydraulic cylinder includes a cylinder body 10, and a piston rod 12 that reciprocates relative to the cylinder body 10 by being connected to a piston 11 disposed in the cylinder body 10. The piston rod 12 includes a rod body 121 and a rod head 122 connected to the rod body 121, the rod diameter of the rod head 122 gradually decreases from the rod body 121 to the outside, the maximum rod diameter of the rod head 122 is not greater than the rod diameter of the rod body 121, and the rod head 122 and the rod body 121 are detachably connected; a cylinder cover 13 is provided at one end of the cylinder body 10 for the piston rod 12 to extend.

[0031] See also Figure 2 and Figure 3 Specifically, a stepped groove 131 is provided on the cylinder cover 13 , the opening direction of the stepped groove 131 is parallel to the piston rod 12 , the stepped groove 131 includes a first step 132 and a second step 133 , and an internal thread is provided on the inner side of the second step 133 .

[0032] The key 20 is arranged at the extended end of the piston rod 12, and the key 20 includes a first key portion 21 and a second key portion 22 connected to the first key portion 21 in a vertical direction. The first key portion 21 includes a bottom portion connected to the piston rod 12, and a top portion formed by extending from the bottom portion toward the side wall of the cylinder head 13 and gradually approaching its two sides, the side of the top portion facing the side wall of the cylinder head 13 is a parallel surface 213 parallel to the side wall of the cylinder head 13, and the two sides of the top portion are the two sides of the bottom gradually approaching to form a first inclined surface 211 and a second inclined surface 212 opposite to each other; the second key portion 22 is fixed to the piston rod 12 through a shaft wire retaining ring 23, thereby fixing the key 20 to the piston rod 12.

[0033] The spring lock assembly 30 includes a base 31 disposed in the cylinder cover 13, at least one spring 32 horizontally sleeved on the base 31, and a top head 33 horizontally sleeved on the spring 32, a portion of the top head 33 protrudes from the inner wall of the cylinder cover 13, and the top head 33 compresses the spring 32 and is limited by the stepped groove 131.

[0034] The base 31 includes a first base portion 311 and a second base portion 312 protruding from the first base portion 311 in the horizontal direction. The first base portion 311 is connected to the step groove 131 through an internal thread and is limited by the step groove 131. The second base portion 312 is located in the middle of the top of the first base portion 311, and a spring 32 is arranged outside the second base portion 312. Specifically, in this embodiment, the second base portion 312 is protruding from the middle of the first base portion 311, and the first base portion 311 is a screw plug. The screw plug cooperates with the internal thread of the second step 133 of the step groove 131 through the external thread, so that the base 31 is screwed into the step groove 131. Since the second base portion 312 is set in a "+" shape, the first base portion 311 will be limited to a suitable position by the step groove 131 when it is screwed into the step groove 131; the spring 32 is a disc spring. It can be understood that the number of springs 32 can be selected according to the deadweight of the piston rod 12.

[0035] The top head 33 includes a top head first portion 331 and a top head second portion 332 horizontally protruding from the top head first portion 331. The vertical cross section of the top head first portion 331 is a "F" shape, and the vertical cross section of the top head second portion 332 is a trapezoid. The top head first portion 331 is limited by the first step 132 of the step groove 131. When the piston rod 12 is extended, the second inclined surface 212 of the clamping key 20 and the second portion 332 of the top head slide and cooperate with the compression spring 32 to pass through the spring lock assembly 30; when the piston rod 12 is retracted, the first inclined surface 211 of the clamping key 20 and the second portion 332 of the top head slide and cooperate with the compression spring 32 to pass through the spring lock assembly 30. After the clamping key 20 passes through the spring lock assembly 30, the spring 32 is reset so that the top head 33 protrudes out of the inner wall of the cylinder head 13 again and is then clamped by the clamping key 20. Specifically, in this embodiment, the second part 332 of the top head is arranged in the middle of the top of the first part 331 of the top head, so that the pressure on the spring 32 is more balanced when the key 20 and the second part 332 of the top head slide together, which is conducive to the smooth passage of the piston rod 12.

[0036] The working principle of the piston rod self-locking structure is as follows:

[0037] When the piston rod 12 is in a fully retracted state, the piston rod 12 extends out under its own weight, and the top head 33 of the spring lock assembly 30 blocks the key 20 to prevent the piston rod 12 from falling out under its own weight; in the process of extending the piston rod 12, under the action of the hydraulic oil, since the key 20 and the top head 33 are in an inclined sliding fit, after the driving force of the hydraulic oil on the piston rod 12 exceeds a certain value, the key 20 compresses the spring 32 through the top head 33 and then passes through the spring lock assembly 30, and the piston 11 is freely extended; in the process of retracting the piston rod 12, under the action of the hydraulic oil, when the key 20 reaches the spring lock assembly 30, it can pass through the top head 33 and compress the spring 32. After the piston rod 12 passes through the spring lock assembly 30, the spring 32 is reset, and the protruding top head 33 clamps the key 20 on the piston rod 12, so that the piston rod 12 is fixed and does not extend out.

[0038] The present application provides a piston rod self-locking structure, which includes a hydraulic cylinder body, and a spring lock assembly 30 and a key 20 arranged on the hydraulic cylinder body. The cylinder body 10 of the hydraulic cylinder body is provided with a cylinder cover 13 at one end for the piston rod 12 to extend, and the cylinder cover 13 is provided with a stepped groove 131 for accommodating the spring lock assembly 30; the spring lock assembly 30 includes a base 31 connected to the cylinder cover 13, at least one spring 32 sleeved on the base 31 in the horizontal direction, and a head 33 sleeved on the spring 32 in the horizontal direction, a part of the head 33 protrudes from the inner wall of the cylinder cover 13, and the head 33 compresses the spring 32 and is locked by the stepped groove. 131 limit; the key 20 is set at the protruding end of the piston rod 12 of the hydraulic cylinder body. When the piston rod 12 retracts and reaches the spring lock assembly 30, the key 20 slides with the top head 33 to further compress the spring 32 and pass through the spring lock assembly 30. After the key 20 passes through the spring lock assembly 30, the spring 32 resets so that the top head 33 protrudes out of the inner wall of the cylinder cover 13 again and is then stuck by the key 20, so as to prevent the piston rod 12 from falling out due to its own weight when the oil port of the cylinder body 10 is opened and connected to the oil pipe.

[0039] The present application also provides a hydraulic cylinder, which includes the above-mentioned piston rod self-locking structure. When the hydraulic cylinder is installed, the rod head 122 of the piston rod 12 is installed vertically downward.

[0040] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A hydraulic cylinder, characterized in that: include: A hydraulic cylinder body, comprising a cylinder body and a piston rod connected to a piston disposed in the cylinder body so as to reciprocate relative to the cylinder body, wherein one end of the cylinder body for the piston rod to extend out is provided with a cylinder cover, and the cylinder cover is provided with a stepped groove; A spring lock assembly is accommodated in the stepped groove, the spring lock assembly comprises a base connected to the cylinder cover, at least one spring sleeved on the base in a horizontal direction, and a head sleeved on the spring in a horizontal direction, a part of the head protrudes from the inner wall of the cylinder cover, and the head compresses the spring and is limited by the stepped groove; A key is arranged at the protruding end of the piston rod. When the piston rod retracts and reaches the spring lock assembly, the key slides with the top head to further compress the spring and pass through the spring lock assembly. After the key passes through the spring lock assembly, the spring is reset so that the top head protrudes out of the inner wall of the cylinder cover again and is then stuck by the key.

2. The hydraulic cylinder according to claim 1, characterized in that: The plug includes a first plug part and a second plug part horizontally protruding from the first plug part, the vertical cross-section of the second plug part is a trapezoid, and the second plug part protrudes from the inner wall of the cylinder head; the key includes a first key part and a second key part vertically connected to the first key part, the first key part has a first inclined surface and a second inclined surface arranged opposite to each other, and the first inclined surface and the second inclined surface can be slidably matched with the second plug part.

3. The hydraulic cylinder according to claim 2, characterized in that: An internal thread is provided in the stepped groove, and the base includes a first base part and a second base part horizontally protruding from the first base part. The first base part is connected to the stepped groove through the internal thread, and the second base part is sleeved in the spring.

4. The hydraulic cylinder according to claim 3, characterized in that: The vertical cross-sections of the first part of the base and the first part of the top are in a "X" shape, and the first part of the base and the first part of the top are both limited by the stepped groove.

5. The hydraulic cylinder according to claim 2, characterized in that: The second part of the key is fixed to the piston rod through a shaft wire retaining ring.

6. The hydraulic cylinder according to claim 3, characterized in that: The first part of the base is a screw plug, and the screw plug is screwed to the stepped groove through threads.

7. The hydraulic cylinder according to claim 1, characterized in that: The spring is a disc spring.

8. The hydraulic cylinder according to claim 1, characterized in that: The number of the springs is selected according to the deadweight of the piston rod.

9. The hydraulic cylinder according to claim 1, characterized in that: The piston rod comprises a rod body and a rod head connected to the rod body, and the rod diameter of the rod head gradually decreases from the rod body outwards.

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