Hydraulic cylinder with self-locking device

Abstract

The utility model provides a hydraulic cylinder with a self-locking device, which comprises a cylinder body, a piston rod, a mechanical locking mechanism and an oil way locking mechanism, and the mechanical locking mechanism pushes a locking head in a locking ring through a locking piston controlled by a spring to lock and unlock the piston rod. The oil way locking mechanism seals the first oil way and the communicating oil way through the locking screw to prevent hydraulic oil in the cylinder body from returning, and when the piston rod normally operates, the first oil way and the second oil way are communicated and matched to make contact with locking of the piston rod so that the piston rod can normally extend outwards. The self-locking device is composed of the mechanical locking mechanism and the oil way locking mechanism, the oil way locking mechanism is matched with the mechanical locking mechanism, and the second oil way communicated with the first oil way is arranged, so that the locking piston in the mechanical locking mechanism moves up and down; the locking piston moves upwards so that the piston rod can be locked and unlocked.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a hydraulic cylinder with a self-locking device. Background Art

[0002] In modern industrial manufacturing and automated control systems, hydraulic cylinders are important actuators that are widely used in power transmission and control of various mechanical equipment. Traditional hydraulic cylinder designs usually focus on improving performance indicators such as load-bearing capacity, stability, and response speed. However, in some situations where a specific position or load needs to be maintained for a long time, the hydraulic system may cause the piston rod to retract due to leakage, pressure fluctuations, or other external interference, affecting the accuracy and reliability of the equipment.

[0003] Currently, most locking mechanisms use externally mounted mechanical locking mechanisms, which require additional equipment, making the structure complex and increasing costs. Although some locking mechanisms prevent hydraulic oil from returning by adding equipment such as one-way valves in the oil circuit, such structures are less effective for some hydraulic cylinders. Utility Model Content

[0004] The utility model is based on the above technical problems and proposes a hydraulic cylinder with a self-locking device.

[0005] A hydraulic cylinder with a self-locking device comprises a cylinder body and a piston rod, wherein the piston rod is installed in the cylinder body, a piston head is provided at the bottom of the piston rod, a mechanical locking mechanism and an oil circuit locking mechanism, wherein the oil circuit locking mechanism comprises a first oil circuit, a connecting oil circuit and a locking screw, an end cover is provided at the lower end of the cylinder body, a transverse first oil circuit and a vertical connecting oil circuit are provided in the end cover, the inner end of the first oil circuit is connected with the cylinder body through the connecting oil circuit, and the locking screw can close the connecting oil circuit; the mechanical locking mechanism comprises a locking ring, a locking piston, a locking head and a spring, the locking ring is fixedly installed on the upper part of the cylinder body, the locking piston is located above the locking ring, the locking piston is sealingly and slidably installed with the cylinder body, and the spring is arranged in the locking ring. Above the piston, the piston rod passes through the locking ring, the locking piston and the spring and is sealed and slidably installed with the three; a sliding groove is provided on the inner side of the locking ring, and the locking head is slidably arranged in the sliding groove; a vertical groove corresponding to the sliding groove is provided on the upper side of the locking ring, and the vertical groove is connected to the tail of the sliding groove; a pressure plate corresponding to the vertical groove is provided on the lower side of the locking piston, and the pressure plate is inserted into the vertical groove. The downward pressure of the pressure plate can push the locking head to slide outward; a card groove corresponding to the sliding groove is provided on the side wall of the piston rod, and the locking head can be inserted into the card groove when it is pushed forward; a second oil circuit is provided on the upper part of the cylinder body, and the second oil circuit is connected to the cavity between the locking ring and the locking piston, and the second oil circuit is connected to the first oil circuit.

[0006] Preferably, a locking hole is further provided in the end cover, and the locking hole is a threaded hole. The locking hole is coaxial with and connected to the connecting oil circuit. The first oil circuit, the connecting oil circuit and the locking hole form a T-shaped hole. A locking screw is provided in the locking hole, and a locking head is provided at the end of the locking screw. The locking head can be inserted into the end of the connecting oil circuit to close it.

[0007] Preferably, the upper end of the spring is connected and fixed to the top cover of the cylinder body, and the lower end of the spring is connected and fixed to the locking piston.

[0008] Preferably, the rear end of the locking head is an inclined surface, and the inner side of the lower end of the pressure plate is provided with a chamfered surface matching the rear end of the locking head. When the pressure plate is pressed downward, the chamfered surface gradually presses downward to push the locking head to slide forward from the sliding groove.

[0009] Preferably, the upper side of the locking ring is also provided with a through hole corresponding to the slide groove one by one, the through hole is connected to the slide groove, the through hole is inclined toward the rear end of the slide groove, and the upper side of the locking head is provided with a rearwardly inclined wide groove, and the wide groove is connected to the through hole.

[0010] Beneficial effect: The self-locking device in the utility model is composed of a mechanical locking mechanism and an oil circuit locking mechanism. The oil circuit locking mechanism cooperates with the mechanical locking mechanism. By setting a second oil circuit connected to the first oil circuit, the locking piston in the mechanical locking mechanism moves up and down. The upward movement of the locking piston can realize the locking and unlocking of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The internal structure diagram of the utility model is shown;

[0012] Figure 2 The utility model is shown Figure 1 A partial enlarged view of

[0013] Figure 3 The structure schematic diagram of the lock ring of the utility model is shown;

[0014] Figure 4 The overall structure diagram of the utility model is shown. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0016] like Figure 1~Figure 4A hydraulic cylinder with a self-locking device shown in the figure includes a cylinder body 1, a piston rod 2, a mechanical locking mechanism, and an oil circuit locking mechanism. The piston rod 2 is installed in the cylinder body 1, and a piston head 3 is provided at the bottom of the piston rod 2. The piston head 3 can slide up and down in the cylinder body 1 and is sealed and installed with the cylinder body 1.

[0017] The oil circuit locking mechanism is arranged in the end cover 4, and the oil circuit locking mechanism includes a first oil circuit 5, a connecting oil circuit 6, and a locking screw 7. The horizontal first oil circuit 5 and the vertical connecting oil circuit 6 are arranged in the end cover 4. The inner end of the first oil circuit 5 is connected with the cylinder body 1 through the connecting oil circuit 6. A locking hole is also provided in the end cover 4. The locking hole is a threaded hole. The locking hole is coaxial with and connected to the connecting oil circuit 6. The first oil circuit 5, the connecting oil circuit 6, and the locking hole form a T-shaped hole. A locking screw 7 is provided in the lock hole. A locking head 8 is provided at the end of the locking screw 7. The locking head 8 can be inserted into the end of the connecting oil circuit 6 to close it.

[0018] The mechanical locking mechanism includes a locking ring 10, a locking piston 11, a locking head 14, and a spring 12. The locking ring 10 is fixedly mounted on the upper part of the cylinder body 1, the locking piston 11 is located above the locking ring 10, the locking piston 11 is sealingly and slidingly mounted with the cylinder body 1, the spring 12 is arranged above the locking piston 11, the upper end of the spring 12 is connected and fixed to the top cover of the cylinder body 1, the lower end of the spring 12 is connected and fixed to the locking piston 11, the piston rod 2 passes through the locking ring 10, the locking piston 11 and the spring 12 and is sealingly and slidingly mounted with the three.

[0019] A slide groove 13 is provided on the inner side of the lock ring 10, and the front end of the slide groove 13 is open. The locking head 14 is slidably arranged in the slide groove 13. A vertical groove 20 corresponding to the slide groove 13 is provided on the upper side of the lock ring 10. The vertical groove 20 is connected to the tail of the slide groove 13. A pressure plate 15 corresponding to the vertical groove 20 is provided on the lower side of the locking piston 11. The pressure plate 15 is inserted into the vertical groove 20. The rear end of the locking head 14 is an inclined inclined surface. The inner side of the lower end of the pressure plate 15 is provided with a chamfered surface matching the rear end of the locking head 14. When the plate 15 is pressed down, the chamfered surface is gradually pressed down to push the locking head 14 to slide forward from the slide groove 13. A groove 16 corresponding to the slide groove 13 is provided on the side wall of the piston rod 2. The locking head 14 can be inserted into the groove 16 when it moves forward. A second oil circuit 18 is provided on the upper part of the cylinder body 1. The second oil circuit 18 is connected to the cavity 17 between the lock ring 10 and the locking piston 11. The second oil circuit 18 is connected to the first oil circuit 5. Connectors 19 are provided on the outside of the first oil circuit 5 and the second oil circuit 18.

[0020] A through hole 21 corresponding to the slide groove 13 is also provided on the upper side of the lock ring 10 , and the through hole 21 is connected to the slide groove 13 , and the through hole 21 is inclined toward the rear end of the slide groove 13 , and a wide groove 22 inclined backward is provided on the upper side of the locking head 14 , and the wide groove 22 is connected to the through hole 21 .

[0021] The working process of the device is that first, the oil pump delivers the hydraulic oil to the lower part of the cylinder body 1 through the first oil circuit 5 and the connecting oil circuit 6, and the hydraulic oil enters the lower cavity 9 to push the piston head 3 upward. At this time, the locking screw 7 is used to disconnect the first oil circuit 5 from the connecting oil circuit 6, so that the piston rod 2 can be locked.

[0022] When the hydraulic oil in the first oil circuit 5 is depressurized, oil will return in the second oil circuit 18. At this time, the spring 12 will push the locking piston 11 to move downward, and the locking piston 11 will drive the pressure plate 15 to push the locking head 14 forward. When the locking head 14 encounters the slot 16, the locking head 14 will be stuck in the slot 16 to lock the piston rod 2.

[0023] When the hydraulic oil in the first oil circuit 5 is restored, the hydraulic oil in the second oil circuit 18 will also be pressurized. The pressurized hydraulic oil enters the wide groove from the perforation 21 and uses the oil pressure to push the locking head 14 back to release the lock on the piston rod 2.

[0024] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hydraulic cylinder with a self-locking device, comprising a cylinder body and a piston rod, wherein the piston rod is installed in the cylinder body and a piston head is provided at the bottom of the piston rod, characterized in that: It also includes a mechanical locking mechanism and an oil circuit locking mechanism, wherein the oil circuit locking mechanism includes a first oil circuit, a connecting oil circuit, and a locking screw. An end cover is provided at the lower end of the cylinder body, and a horizontal first oil circuit and a vertical connecting oil circuit are provided in the end cover. The inner end of the first oil circuit is connected to the cylinder body through the connecting oil circuit, and the locking screw can close the connecting oil circuit; the mechanical locking mechanism includes a locking ring, a locking piston, a locking head, and a spring. The locking ring is fixedly mounted on the upper part of the cylinder body, the locking piston is located above the locking ring, the locking piston is sealingly and slidably mounted with the cylinder body, the spring is arranged above the locking piston, and the piston rod passes through the locking ring, the locking piston and the The spring is sealed and slidably installed with the three; a sliding groove is provided on the inner side of the locking ring, and the locking head is slidably arranged in the sliding groove; a vertical groove corresponding to the sliding groove is provided on the upper side of the locking ring, and the vertical groove is connected to the tail of the sliding groove; a pressure plate corresponding to the vertical groove is provided on the lower side of the locking piston, and the pressure plate is inserted into the vertical groove. The downward pressure of the pressure plate can push the locking head to slide outward; a card groove corresponding to the sliding groove is provided on the side wall of the piston rod, and the locking head can be inserted into the card groove when it is pushed forward; a second oil circuit is provided on the upper part of the cylinder body, and the second oil circuit is connected to the cavity between the locking ring and the locking piston, and the second oil circuit is connected to the first oil circuit.

2. The hydraulic cylinder with a self-locking device according to claim 1, characterized in that: A locking hole is also provided in the end cover, and the locking hole is a threaded hole. The locking hole is coaxial with and connected to the connecting oil circuit. The first oil circuit, the connecting oil circuit and the locking hole form a T-shaped hole. A locking screw is provided in the locking hole, and a locking head is provided at the end of the locking screw. The locking head can be inserted into the end of the connecting oil circuit to close it.

3. The hydraulic cylinder with a self-locking device according to claim 1, characterized in that: The upper end of the spring is connected and fixed to the top cover of the cylinder body, and the lower end of the spring is connected and fixed to the locking piston.

4. The hydraulic cylinder with a self-locking device according to claim 1, characterized in that: The rear end of the locking head is an inclined slope, and the inner side of the lower end of the pressure plate is provided with a chamfered surface matching the rear end of the locking head. When the pressure plate is pressed down, the chamfered surface gradually presses down to push the locking head to slide forward from the sliding groove.

5. The hydraulic cylinder with a self-locking device according to claim 1, characterized in that: The upper side of the locking ring is also provided with a through hole corresponding to the slide groove one by one, the through hole is connected to the slide groove, the through hole is inclined toward the rear end of the slide groove, and the upper side of the locking head is provided with a rearwardly inclined wide groove, and the wide groove is connected to the through hole.

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