Rotary cylinder

Abstract

The utility model provides a kind of rotary oil cylinder, including cylinder, front end cover and rear end cover, the oil inlet and oil outlet are equipped on the cylinder outer wall, the thread is equipped on the cylinder inner wall, the front end cover and rear end cover are respectively installed in the front and rear of cylinder, the front end cover is fixedly connected with cylinder by internal hexagon bolt;The piston and piston rod are equipped in the cylinder, the buffer plate is further sleeved on the piston rod, the buffer spring is equipped between the buffer plate and support ring, the buffer spring is equipped with multiple, along the axial circumference of piston rod arrangement, the buffer spring one end is fixedly connected with buffer ring side wall, by setting buffer plate and buffer spring in the cylinder, can play buffering effect when piston moves to limit position, reduce impact force, prolong the service life of oil cylinder, and the design of buffer block and guide sleeve, further improve the buffering performance of oil cylinder and the movement stability of piston rod.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a rotary hydraulic cylinder. Background Technology

[0002] A rotary cylinder, also known as a swing cylinder or swivel cylinder, is a hydraulic actuator that converts hydraulic energy into mechanical energy (rotational motion). When hydraulic oil is pumped into a chamber of the cylinder, the piston or rotor moves under pressure. Unlike linear cylinders, rotary cylinders use a special mechanical structure to convert hydraulic energy into rotational torque and angular displacement.

[0003] Some existing rotary cylinders lack effective buffer devices, which can easily generate large impact forces when the piston rod moves rapidly to its limit position, thereby shortening the service life of the cylinder. To address this problem, a rotary cylinder is proposed here. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology and solve the problem of the lack of an effective buffer device in the existing rotary cylinder, this utility model provides a rotary cylinder.

[0005] This utility model is achieved using the following technical solution:

[0006] A rotary cylinder includes a cylinder barrel, a front end cover, and a rear end cover. The outer peripheral wall of the cylinder barrel is provided with an oil inlet and an oil outlet, and the inner wall of the cylinder barrel is provided with threads. The front end cover and the rear end cover are respectively installed at the front and rear ends of the cylinder barrel. The front end cover is fixedly connected to the cylinder barrel by hexagonal socket head caps.

[0007] The cylinder is equipped with a piston and a piston rod. The piston rod is sleeved inside the piston. The piston has threads on its inner wall and outer peripheral wall. The piston is installed inside the cylinder and meshes with the threads inside the cylinder. The outer peripheral wall at the bottom of the piston rod has matching threads. The piston rod passes through the cylinder and extends out of the front end cover at one end.

[0008] The piston rod is also provided with a support ring, which is integrated with the piston rod. Bearings are provided on both sides of the support ring, and the bearings are sleeved on the piston rod.

[0009] A buffer plate is also fitted on the piston rod, and a buffer spring is provided between the buffer plate and the support ring. Multiple buffer springs are provided and arranged along the circumference of the piston rod axis. One end of the buffer spring is fixedly connected to the side wall of the buffer ring.

[0010] A buffer block is provided between the bottom of the cylinder and the rear end cover. The buffer block is provided with a guide post, and the rear end cover is provided with a matching guide hole. The buffer block is engaged with the rear end cover through the guide post.

[0011] The piston is provided with a piston sealing ring on its outer peripheral wall.

[0012] The rear end cover is provided with a locking block, which is an annular locking block. The outer peripheral wall of the locking block is provided with threads. The cylinder is provided with a matching locking groove, and the inner wall of the locking groove is provided with threads. The rear end cover and the cylinder are connected by threads.

[0013] A guide sleeve is provided at one end of the cylinder near the front end cover. A guide sleeve sealing ring is provided on the outer peripheral wall of the guide sleeve. The guide sleeve is fitted onto the piston rod.

[0014] The present invention has the following advantages over the prior art:

[0015] 1. By setting buffer plates and buffer springs inside the cylinder, the piston can be buffered when it moves to the limit position, reducing the impact force and extending the service life of the cylinder. The design of the buffer block and guide sleeve further improves the buffering performance of the cylinder and the movement stability of the piston rod.

[0016] 2. The front cover of this device is fixedly connected to the cylinder by internal hex bolts, and the rear cover is connected to the cylinder by threads. The connection method is firm and reliable, which can effectively prevent hydraulic oil leakage and ensure the normal operation of the cylinder. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is an exploded three-dimensional structural diagram of this utility model;

[0019] Figure 3 This is a front view of the utility model;

[0020] Figure 4 This is a side view of the present invention;

[0021] In the diagram: 1. Cylinder; 11. Oil inlet; 12. Oil outlet; 13. Slot; 2. Rear end cap; 3. Front end cap; 31. Socket head bolt; 4. Guide sleeve; 41. Guide sleeve seal ring; 5. Piston rod; 51. Support ring; 6. Bearing; 7. Piston; 71. Piston seal ring; 8. Buffer plate; 81. Buffer spring; 9. Buffer block; 91. Guide column. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 4 As shown, a rotary hydraulic cylinder includes a cylinder barrel 1, a front end cover 3, and a rear end cover 2. The outer peripheral wall of the cylinder barrel 1 is provided with an oil inlet 11 and an oil outlet 12, which are connected to the interior of the cylinder barrel 1 for the entry and exit of hydraulic oil to realize the power drive of the hydraulic cylinder. The inner wall of the cylinder barrel 1 is provided with threads to provide guidance and power transmission for the movement of the piston 7. The front end cover 3 and the rear end cover 2 are respectively installed at the front and rear ends of the cylinder barrel 1. The front end cover 3 is fixedly connected to the cylinder barrel 1 by an internal hex bolt 31. The front end cover 3 and the rear end cover 2 serve to seal and support. The connection method between the front end cover 3 and the cylinder barrel 1 has the advantages of convenient installation and firm connection, which can effectively ensure the sealing and stability between the front end cover 3 and the cylinder barrel 1 and prevent hydraulic oil leakage.

[0025] The cylinder 1 is equipped with a piston 7 and a piston rod 5. The piston rod 5 is sleeved inside the piston 7. The inner wall and outer peripheral wall of the piston 7 are threaded. The piston 7 is disposed inside the cylinder 1 and meshes with the thread inside the cylinder 1. When hydraulic oil enters the cylinder 1 from the oil inlet 11, it pushes the piston 7 to move back and forth along the thread on the inner wall of the cylinder 1. The outer peripheral wall at the bottom of the piston rod 5 is provided with a matching thread. The piston rod 5 passes through the cylinder 1, with one end extending out of the front end cover 3. During the rotation of the piston 7, the piston rod 5 is driven to rotate together through the threaded transmission, thereby realizing rotational output.

[0026] The piston rod 5 is also provided with a support ring 51, which is integrated with the piston rod 5. Bearings 6 are provided on both sides of the support ring 51, and the bearings 6 are sleeved on the piston rod 5. The bearings 6 can effectively reduce the frictional resistance of the piston rod 5 during rotation, improve the stability and accuracy of rotation, and at the same time, the support ring 51 plays the role of supporting the bearings 6 to ensure the normal operation of the bearings 6.

[0027] A buffer plate 8 is also fitted onto the piston rod 5. A buffer spring 81 is provided between the buffer plate 8 and the support ring 51. Multiple buffer springs 81 are arranged along the circumference of the piston rod 5's axis, and one end of each buffer spring 81 is fixedly connected to the side wall of the buffer ring. When the piston 7 approaches its limit position during movement, the buffer plate 8 will first contact the end of the piston 7. At this time, the buffer spring 81 is compressed, playing a buffering role, reducing the impact force of the piston 7 on the internal components, and extending the service life of the hydraulic cylinder.

[0028] A buffer block 9 is provided between the bottom of the cylinder 1 and the rear end cover 2. The buffer block 9 is provided with a guide post 91, and the rear end cover 2 is provided with a matching guide hole. The buffer block 9 is engaged with the rear end cover 2 through the guide post 91. The buffer block 9 can play a buffering role when the piston 7 moves to the bottom of the cylinder 1, reducing the impact of the piston 7 on the bottom of the cylinder 1.

[0029] A piston seal ring 71 is provided on the outer peripheral wall of the piston 7. The piston seal ring 71 can effectively prevent hydraulic oil from leaking from the gap between the piston 7 and the inner wall of the cylinder 1, ensuring the sealing performance of the cylinder and improving the working efficiency of the cylinder.

[0030] The rear end cover 2 is provided with a locking block, which is an annular locking block with threads on its outer peripheral wall. The cylinder 1 is provided with a matching locking groove 13, the inner wall of which is threaded. The rear end cover 2 and the cylinder 1 are threaded together. This threaded connection method has the advantages of reliable connection and convenient disassembly, facilitating the installation and maintenance of the hydraulic cylinder.

[0031] A guide sleeve 4 is provided at one end of the cylinder 1 near the front end cover 3. A guide sleeve sealing ring 41 is provided on the outer peripheral wall of the guide sleeve 4. The guide sleeve 4 is fitted onto the piston rod 5. The guide sleeve 4 can guide the movement of the piston rod 5, ensuring the straightness of the piston rod 5 during rotation and improving rotational accuracy. The guide sleeve sealing ring 41 can prevent hydraulic oil from leaking from the gap between the guide sleeve 4 and the piston rod 5.

[0032] The working principle of this utility model is as follows: When hydraulic oil enters the cylinder 1 from the oil inlet 11, it pushes the piston 7 to rotate forward along the thread on the inner wall of the cylinder 1. The piston 7 drives the piston rod 5 to rotate together through the thread transmission, so as to realize the rotation output.

[0033] During the rotation of piston rod 5, support ring 51 and bearing 6 reduce frictional resistance and ensure smooth rotation. When piston 7 moves to near its limit position, buffer plate 8 first contacts the end of piston 7, and buffer spring 81 is compressed to provide a buffering effect.

[0034] When the piston 7 moves to the bottom of the cylinder 1, the buffer block 9 provides further buffering, while the guide sleeve 4 guides the movement of the piston rod 5, ensuring the straightness of the piston rod 5.

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A rotary hydraulic cylinder, comprising a cylinder barrel (1), a front end cover (3), and a rear end cover (2), wherein the outer peripheral wall of the cylinder barrel (1) is provided with an oil inlet (11) and an oil outlet (12), and the inner wall of the cylinder barrel (1) is provided with threads, and the front end cover (3) and the rear end cover (2) are respectively installed at the front and rear ends of the cylinder barrel (1), characterized in that, The front end cover (3) is fixedly connected to the cylinder (1) by internal hex bolts (31); The cylinder (1) is provided with a piston (7) and a piston rod (5). The piston rod (5) is sleeved inside the piston (7). The inner wall and outer peripheral wall of the piston (7) are provided with threads. The piston (7) is set inside the cylinder (1) and meshes with the threads inside the cylinder (1). The outer peripheral wall at the bottom of the piston rod (5) is provided with matching threads. The piston rod (5) passes through the cylinder (1) and one end extends out of the front end cover (3). The piston rod (5) is also provided with a support ring (51), the support ring (51) is integrated with the piston rod (5), and bearings (6) are provided on both sides of the support ring (51), the bearings (6) are sleeved on the piston rod (5); A buffer plate (8) is also fitted on the piston rod (5). A buffer spring (81) is provided between the buffer plate (8) and the support ring (51). Multiple buffer springs (81) are provided and arranged along the circumference of the piston rod (5). One end of the buffer spring (81) is fixedly connected to the side wall of the buffer ring.

2. A rotary hydraulic cylinder according to claim 1, characterized in that: A buffer block (9) is provided between the bottom of the cylinder (1) and the rear end cover (2). A guide post (91) is provided on the buffer block (9). A matching guide hole is provided on the rear end cover (2). The buffer block (9) is snapped onto the rear end cover (2) through the guide post (91).

3. A rotary hydraulic cylinder according to claim 1, characterized in that: The piston (7) is provided with a piston seal ring (71) on its outer peripheral wall.

4. A rotary hydraulic cylinder according to claim 1, characterized in that: The rear end cover (2) is provided with a locking block, which is an annular locking block. The outer peripheral wall of the locking block is provided with threads. The cylinder (1) is provided with a matching locking groove (13), and the inner wall of the locking groove (13) is provided with threads. The rear end cover (2) and the cylinder (1) are threadedly connected.

5. A rotary hydraulic cylinder according to claim 1, characterized in that: The cylinder (1) is provided with a guide sleeve (4) at one end near the front end cover. The outer peripheral wall of the guide sleeve (4) is provided with a guide sleeve sealing ring (41). The guide sleeve (4) is sleeved on the piston rod (5).

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