Oil cylinder with mechanical locking device at any position

Abstract

The oil cylinder comprises a cylinder body and a piston rod, a cylinder base is arranged at the bottom of an inner cavity of the cylinder body, a rotation stopping shaft is installed in the middle of an inner cavity of the cylinder base, the end, away from the cylinder base, of the rotation stopping shaft extends into the cylinder body, and a disc spring is arranged at the position, surrounding the outer portion of the rotation stopping shaft, of the inner cavity of the cylinder base. A brake piston is arranged below the disc spring, the brake piston is installed in an inner cavity of the cylinder base in a sliding mode and surrounds the outer portion of the rotation stopping shaft, a bearing base is installed on the side, located on the cylinder base, of the inner cavity of the cylinder body, and a lead screw is rotationally installed in the middle of the bearing base. According to the oil cylinder, the piston rod can be locked at any position in the oil cylinder in a mechanical locking mode, work of the oil cylinder is stopped, the locking force borne by the piston rod is improved, the piston rod stops at the fixed position for a long time to support driving equipment, the stability of the locked piston rod is guaranteed, and the service life of the piston rod is prolonged. And the stability and the safety of the oil cylinder are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to an oil cylinder with a mechanical locking device at any position. Background Art

[0002] The oil cylinder is a hydraulic cylinder. The hydraulic cylinder is a linear motion actuator whose output force is proportional to the effective area of ​​the piston and the pressure difference on both sides. Its function is to convert hydraulic energy into mechanical energy. The input of the hydraulic cylinder is the flow rate and pressure of the fluid, and the output is the linear motion speed and force. The piston of the hydraulic cylinder can complete linear reciprocating motion, and the output linear displacement is limited. The hydraulic cylinder is an energy conversion device that converts hydraulic energy into mechanical energy of reciprocating linear motion. It has the characteristics of smooth movement and large load, and is widely used in engineering machinery, construction machinery, aerospace and other equipment.

[0003] However, due to the different use requirements of various equipment and different working states of the oil cylinder, the oil cylinder often needs to stop working and lock at any output working position, and keep the stroke unchanged for a long time. There are two existing ways to lock the oil cylinder. One is to use hydraulic components for locking, such as the commonly used hydraulic lock circuit, balance valve circuit, etc. However, the locking method using the hydraulic lock circuit inevitably has leakage, which cannot guarantee the reliability of locking. The other is to use mechanical locking on the oil cylinder, such as steel ball locking, but this locking method can only be locked at the end of the oil cylinder, and cannot achieve locking at any position. Moreover, the locking force is small and cannot meet the work requirements of the oil cylinder such as weight lifting. Therefore, those skilled in the art provide a cylinder with a mechanical locking device at any position to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the utility model is to provide an oil cylinder with a mechanical locking device at any position to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A hydraulic cylinder with a mechanical locking device at any position, comprising: a cylinder body and a piston rod, a cylinder seat is arranged at the bottom of the inner cavity of the cylinder body, a rotation-stopping shaft is installed at the middle position of the inner cavity of the cylinder seat, the end of the rotation-stopping shaft away from the cylinder seat extends to the inside of the cylinder body, and a disc spring is arranged around the outside of the rotation-stopping shaft in the inner cavity of the cylinder seat, a brake piston is arranged below the disc spring, the brake piston is slidably installed in the inner cavity of the cylinder seat and around the outside of the rotation-stopping shaft, and a bearing seat is installed on one side of the inner cavity of the cylinder body on the cylinder seat, and the middle position of the bearing seat is A screw is rotatably installed, and the screw is sleeved on the outside of the stop shaft. In addition, one end of the screw near the cylinder seat passes through the bearing seat and is inserted into the inside of the brake piston. The end surface of the brake piston is surrounded by a static friction plate on the outside of the screw. The outer wall of the screw is located on one side of the brake piston and is provided with a dynamic friction plate. The dynamic friction plate and the static friction plate fit each other, and the piston rod is inserted into the inner cavity of the cylinder body and sleeved on the stop shaft and the end of the screw far away from the cylinder seat. The piston rod can slide in the inner cavity of the cylinder body and the outer wall of the stop shaft through the rotation of the screw.

[0007] Preferably, the outer wall of the cylinder body has a brake oil port for driving the brake piston to move, and a first pressure oil port and a second pressure oil port for driving the piston rod to move.

[0008] Preferably, a connecting rod is provided at one end of the piston rod close to the bearing seat, a second thread groove is provided inside the connecting rod, and the connecting rod is sleeved on the outer wall of the screw rod through the second thread groove.

[0009] Preferably, a slot is provided at one end of the inner cavity of the piston rod near the bearing seat, and the connecting rod is inserted into the slot. In addition, an annular end plate is provided on the outer wall of the connecting rod, and a number of fastening bolts are evenly provided on the end surface of the annular end plate. The fastening bolts pass through the annular end plate and are threadedly installed on the end surface of the piston rod.

[0010] Preferably, a limit plate is provided at one end of the stop shaft located in the inner cavity of the piston rod, and a plurality of teeth are evenly arranged on the outer wall of the limit plate, and a tooth groove is provided in the part of the inner cavity of the piston rod away from the slot, and the piston rod slides on the outer wall of the limit plate through the cooperation of the tooth groove and the teeth, and the limit plate is attached to the end face of the screw rod.

[0011] Preferably, a hollow groove is provided inside the screw rod, and the screw rod is sleeved on the outside of the stop shaft through the hollow groove, and the end surface area of ​​the limiting plate is larger than the opening area of ​​the hollow groove.

[0012] Preferably, a locking nut for limiting the position of the cylinder seat is provided at the bottom of the cylinder body, and an annular protrusion is provided at the bottom of the cylinder seat, a first thread groove is provided in the inner cavity of the cylinder body surrounding the outside of the annular protrusion, and the locking nut is threadedly installed on the outer wall of the annular protrusion and fixed inside the first thread groove.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] By arranging a screw rod and a stop shaft inside the cylinder body, when the oil cylinder is in use, the pressure oil can be transported into the cylinder body through the brake oil port, so that the pressure oil pushes the brake piston to move in the cylinder seat and compresses the disc spring, so that the static friction plate installed on the brake piston is separated from the dynamic friction plate installed on the outer wall of the screw rod, and then the pressure oil is transported into the cylinder body through the first pressure oil port, so that the pressure oil pushes the screw rod to rotate in the cylinder body, and drives the connecting rod and the piston rod installed thereon through the second threaded groove to move in the cylinder body, thereby realizing the adjustment of the position of the piston rod and ensuring the use of the oil cylinder. Moreover, when the piston rod inside the oil cylinder is locked, the supply of pressure oil in the cylinder body can be stopped at the brake oil port to reduce the pressure at the brake oil port , so that the brake piston is not affected by the pressure of the pressure oil, and the brake piston returns to its original position under the action of the disc spring elastic force, so that the static friction plate installed on the brake piston and the dynamic friction plate installed on the outer wall of the screw rod fit each other, so that the screw rod cannot rotate under the action of the friction force of the static friction plate and the dynamic friction plate, so that the piston rod installed on the screw rod cannot be displaced inside the cylinder body, thereby realizing the limitation of the piston rod, and the piston rod can be locked at any position inside the oil cylinder by mechanical locking method, stopping the work of the oil cylinder, increasing the locking force on the piston rod, and allowing the piston rod to stop at a fixed position for a long time to support the driving equipment, thereby ensuring the stability of the locked piston rod and improving the stability and safety of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of an oil cylinder according to an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the connection between the piston rod and the cylinder body according to an embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the disassembly of a piston rod according to an embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the connection between the anti-rotation shaft and the screw rod according to an embodiment of the utility model;

[0019] Figure 5 The figure is a schematic diagram of the disassembly of the locking nut, the cylinder body and the cylinder seat according to an embodiment of the utility model.

[0020] In the figure: 1. cylinder body; 101. brake oil port; 102. first pressure oil port; 103. second pressure oil port; 104. first threaded groove; 11. cylinder seat; 111. annular protrusion; 12. anti-rotation shaft; 121. limit plate; 122. teeth; 13. disc spring; 14. brake piston; 15. bearing seat; 16. screw rod; 161. empty groove; 17. dynamic friction plate; 18. static friction plate; 19. locking nut; 2. piston rod; 201. slot; 202. tooth groove; 21. connecting rod; 211. second threaded groove; 22. annular end plate; 23. fastening bolt. DETAILED DESCRIPTION

[0021] In the description of the present utility model, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof are intended to cover non-exclusive inclusions.

[0022] Combination Figure 1-Figure 5As shown, a cylinder seat 11 is provided at the bottom of the inner cavity of the cylinder body 1, and a stop shaft 12 is installed at the middle position of the inner cavity of the cylinder seat 11. The end of the stop shaft 12 away from the cylinder seat 11 extends to the inside of the cylinder body 1, and a disc spring 13 is provided around the outside of the stop shaft 12 in the inner cavity of the cylinder seat 11, and a brake piston 14 is provided below the disc spring 13. The brake piston 14 is slidably installed in the inner cavity of the cylinder seat 11 and around the outside of the stop shaft 12, and a bearing seat 15 is installed on one side of the inner cavity of the cylinder body 1 on the cylinder seat 11, and a screw rod 16 is rotatably installed at the middle position of the bearing seat 15, and the screw rod 16 is sleeved on The outside of the anti-rotation shaft 12, and the end of the screw rod 16 close to the cylinder seat 11 passes through the bearing seat 15 and is inserted into the inside of the brake piston 14. The end surface of the brake piston 14 is provided with a static friction plate 18 around the outside of the screw rod 16, and the outer wall of the screw rod 16 is located on one side of the brake piston 14 and is provided with a dynamic friction plate 17. The dynamic friction plate 17 and the static friction plate 18 fit each other, and the piston rod 2 is inserted into the inner cavity of the cylinder body 1 and is mounted on the anti-rotation shaft 12 and the end of the screw rod 16 away from the cylinder seat 11. The piston rod 2 can slide in the inner cavity of the cylinder body 1 and the outer wall of the anti-rotation shaft 12 through the rotation of the screw rod 16.

[0023] In one embodiment, when locking the piston rod 2 inside the oil cylinder, the supply of pressure oil in the cylinder body 1 can be stopped at the brake oil port 101, the pressure at the brake oil port 101 can be reduced, the brake piston 14 is not affected by the pressure of the pressure oil, and the brake piston 14 is restored to its original position under the action of the elastic force of the disc spring 13, so that the static friction plate 18 installed on the brake piston 14 and the dynamic friction plate 17 installed on the outer wall of the screw rod 16 are fitted with each other, so that the screw rod 16 cannot rotate under the action of the friction force of the static friction plate 18 and the dynamic friction plate 17, so that the piston rod 2 installed on the screw rod 16 cannot be displaced inside the cylinder body 1, and the piston rod 2 is limited. The piston rod 2 can be locked at any position inside the oil cylinder by mechanical locking, the operation of the oil cylinder is stopped, the locking force on the piston rod 2 is increased, and the piston rod 2 is stopped at a fixed position for a long time to support the driving device, thereby ensuring the stability of the locked piston rod 2, improving the stability and safety of the oil cylinder, and having strong practicality.

[0024] In one embodiment, when the driving piston rod 2 is extended in the oil cylinder, the pressure oil can be delivered to the cylinder body 1 through the brake oil port 101, so that the pressure oil pushes the brake piston 14 to displace in the cylinder seat 11 and compresses the disc spring 13, so that the static friction plate 18 installed on the brake piston 14 is separated from the dynamic friction plate 17 installed on the outer wall of the screw rod 16, and then the pressure oil is delivered to the inside of the cylinder body 1 through the first pressure oil port 102, so that the pressure oil pushes the screw rod 16 to rotate forward in the cylinder body 1, and drives the connecting rod 21 and the piston rod 2 installed thereon through the second threaded groove 211 to displace in the cylinder body 1, so that the piston rod 2 is extended to the outside of the oil cylinder, thereby ensuring the use of the oil cylinder.

[0025] In one embodiment, when the driving piston rod 2 is extended in the oil cylinder, the pressure oil can be delivered to the cylinder body 1 through the brake oil port 101, so that the pressure oil pushes the brake piston 14 to displace in the cylinder seat 11 and compresses the disc spring 13, so that the static friction plate 18 installed on the brake piston 14 is separated from the dynamic friction plate 17 installed on the outer wall of the screw rod 16, and then the pressure oil is delivered to the inside of the cylinder body 1 through the second pressure oil port 103, so that the pressure oil pushes the screw rod 16 to rotate in the opposite direction in the cylinder body 1, and drives the connecting rod 21 and the piston rod 2 installed thereon through the second threaded groove 211 to displace in the cylinder body 1, so that the piston rod 2 is retracted toward the inside of the oil cylinder, completing the retraction work of the piston rod 2 and realizing the adjustment of the position of the piston rod 2.

[0026] In one embodiment, when assembling the piston rod 2, the connecting rod 21 can be first inserted into the slot 201, so that the second thread groove 211 is connected to the inner cavity of the piston rod 2, and the annular end plate 22 installed on the outside of the connecting rod 21 is tightly attached to the end face of the piston rod 2, and the fastening bolts 23 on the end face of the annular end plate 22 are screwed to fix the connecting rod 21 to the end face of the piston rod 2, so that the assembly of the piston rod 2 is completed, and the connecting rod 21 can be fixed to the end of the piston rod 2, and the piston rod 2 can be installed on the outside of the screw rod 16 through the second thread groove 211 inside the connecting rod 21, so that the piston rod 2 can be displaced in the cylinder body 1 through the rotation of the screw rod 16, thereby realizing the position adjustment of the piston rod 2.

[0027] In one embodiment, since the piston rod 2 slides on the outside of the limit plate 121 through the cooperation between the tooth groove 202 and the teeth 122, when adjusting the position of the piston rod 2, the teeth 122 installed on the stop shaft 12 and the limit plate 121 can limit the position of the piston rod 2 to prevent the piston rod 2 from rotating along with the rotation of the screw rod 16, thereby avoiding the situation in which the piston rod 2 cannot rotate inside the cylinder body 1 due to the rotation of the piston rod 2 along with the screw rod 16. In addition, since the screw rod 16 is mounted on the outside of the stop shaft 12 through the empty groove 161, the stop shaft 12 will not affect the rotation of the screw rod 16, thereby ensuring the position adjustment of the piston rod 2.

[0028] In one embodiment, when the cylinder seat 11 is installed at the bottom of the cylinder body 1 for use, the cylinder seat 11 can be inserted into the inner cavity of the cylinder body 1 from the bottom of the cylinder body 1, so that the end surface of the annular protrusion 111 is flush with the opening of the cylinder body 1, and then the locking nut 19 is screwed to fix the locking nut 19 on the outer wall of the annular protrusion 111, and the locking nut 19 is fixed to the inner cavity of the cylinder body 1 through the first thread groove 104, thereby completing the connection between the cylinder body 1 and the cylinder seat 11, ensuring the stability between the cylinder body 1 and the cylinder seat 11, and facilitating the subsequent disassembly of the oil cylinder.

[0029] The working principle of the utility model is as follows: when the piston rod 2 is driven to extend and retract inside the oil cylinder, the pressure oil can be delivered to the cylinder body 1 through the brake oil port 101, so that the pressure oil pushes the brake piston 14 to move in the cylinder seat 11 and compresses the disc spring 13, so that the static friction plate 18 installed on the brake piston 14 is separated from the dynamic friction plate 17 installed on the outer wall of the screw rod 16, and then the pressure oil is delivered to the cylinder body 1 through the first pressure oil port 102 or the second pressure oil port 103, so that the pressure oil pushes the screw rod 16 to rotate forward or reverse in the cylinder body 1, and drives the connecting rod 21 and the piston rod 2 installed thereon through the second threaded groove 211 to extend or retract in the cylinder body 1, thereby realizing the adjustment of the position of the piston rod 2 and ensuring the use of the oil cylinder. Moreover, when the piston rod 2 inside the oil cylinder is locked, the supply of pressure oil in the cylinder body 1 can be stopped at the brake oil port 101. The force oil reduces the pressure at the brake oil port 101, so that the brake piston 14 is not affected by the pressure of the pressure oil, and the brake piston 14 returns to its original position under the action of the elastic force of the disc spring 13, so that the static friction plate 18 installed on the brake piston 14 and the dynamic friction plate 17 installed on the outer wall of the screw rod 16 fit each other, so that the screw rod 16 cannot rotate under the action of the friction force of the static friction plate 18 and the dynamic friction plate 17, so that the piston rod 2 installed on the screw rod 16 cannot be displaced inside the cylinder body 1, thereby achieving the limitation of the piston rod 2, and the piston rod 2 can be locked at any position inside the oil cylinder by mechanical locking, stopping the operation of the oil cylinder, increasing the locking force on the piston rod 2, and allowing the piston rod 2 to stop at a fixed position for a long time to support the driving equipment, thereby ensuring the stability of the locked piston rod 2, improving the stability and safety of the oil cylinder, and having strong practicality.

[0030] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cylinder with a mechanical locking device at any position, comprising: A cylinder body (1) and a piston rod (2), characterized in that a cylinder seat (11) is provided at the bottom of the inner cavity of the cylinder body (1), a stop shaft (12) is installed at the middle position of the inner cavity of the cylinder seat (11), and the stop shaft (12) extends to the inside of the cylinder body (1) from one end of the cylinder seat (11) away from the cylinder seat, and a disc spring (13) is provided around the outside of the stop shaft (12) in the inner cavity of the cylinder seat (11), and a brake piston (14) is provided below the disc spring (13), and the brake piston (14) is slidably installed in the inner cavity of the cylinder seat (11) and around the outside of the stop shaft (12), and a bearing seat (15) is installed on one side of the inner cavity of the cylinder body (1) located on the cylinder seat (11), and a screw rod (16) is rotatably installed at the middle position of the bearing seat (15), and the screw rod (16) The screw rod (16) is sleeved on the outside of the anti-rotation shaft (12), and one end of the screw rod (16) close to the cylinder seat (11) passes through the bearing seat (15) and is inserted into the inside of the brake piston (14). The end surface of the brake piston (14) is provided with a static friction plate (18) around the outside of the screw rod (16). The outer wall of the screw rod (16) is provided with a dynamic friction plate (17) on one side of the brake piston (14). The dynamic friction plate (17) and the static friction plate (18) are in contact with each other. The piston rod (2) is inserted into the inner cavity of the cylinder body (1) and sleeved on the anti-rotation shaft (12) and one end of the screw rod (16) away from the cylinder seat (11). The piston rod (2) can slide in the inner cavity of the cylinder body (1) and on the outer wall of the anti-rotation shaft (12) through the rotation of the screw rod (16).

2. The oil cylinder with a mechanical locking device at any position according to claim 1, characterized in that: The outer wall of the cylinder body (1) has a brake oil port (101) for driving the brake piston (14) to move, and a first pressure oil port (102) and a second pressure oil port (103) for driving the piston rod (2) to move.

3. The oil cylinder with a mechanical locking device at any position according to claim 1, characterized in that: A connecting rod (21) is provided at one end of the piston rod (2) close to the bearing seat (15), a second thread groove (211) is provided inside the connecting rod (21), and the connecting rod (21) is sleeved on the outer wall of the screw rod (16) through the second thread groove (211).

4. The oil cylinder with a mechanical locking device at any position according to claim 3, characterized in that: A slot (201) is provided at one end of the inner cavity of the piston rod (2) close to the bearing seat (15), and the connecting rod (21) is inserted into the slot (201). In addition, an annular end plate (22) is provided on the outer wall of the connecting rod (21), and a plurality of fastening bolts (23) are evenly arranged on the end surface of the annular end plate (22). The fastening bolts (23) penetrate through the annular end plate (22) and are threadedly mounted on the end surface of the piston rod (2).

5. The oil cylinder with a mechanical locking device at any position according to claim 4, characterized in that: A limit plate (121) is provided at one end of the stop shaft (12) located in the inner cavity of the piston rod (2); a plurality of teeth (122) are evenly arranged on the outer wall of the limit plate (121); and a tooth groove (202) is provided in a portion of the inner cavity of the piston rod (2) away from the slot (201); the piston rod (2) slides on the outer wall of the limit plate (121) through the cooperation between the tooth groove (202) and the teeth (122), and the limit plate (121) is in contact with the end face of the screw rod (16).

6. The oil cylinder with a mechanical locking device at any position according to claim 5, characterized in that: The screw rod (16) has an empty slot (161) formed inside, and the screw rod (16) is inserted into the outside of the stop shaft (12) through the empty slot (161). In addition, the end surface area of ​​the limiting plate (121) is larger than the opening area of ​​the empty slot (161).

7. The oil cylinder with a mechanical locking device at any position according to claim 1, characterized in that: The bottom of the cylinder body (1) is provided with a locking nut (19) for limiting the position of the cylinder seat (11), and the bottom of the cylinder seat (11) is provided with an annular protrusion (111), the inner cavity of the cylinder body (1) is provided with a first thread groove (104) in the part surrounding the outside of the annular protrusion (111), and the locking nut (19) is threadedly mounted on the outer wall of the annular protrusion (111) and fixed inside the first thread groove (104).

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