Hydraulic oil cylinder for double-beam crane
By designing a multi-stage buffer mechanism in the hydraulic cylinder, using the coordination of the limiting plate, buffer base and slide chute, multi-stage buffering of the piston slide rod is achieved, solving the problem of collision between the piston rod and the cylinder body in the existing hydraulic cylinder. Extends service life and improves smoothness of movement.
Patent Information
- Application Number
- CN202420965979.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-07
AI Technical Summary
During the reciprocating process of the piston rod of the existing hydraulic cylinder, the buffering effect is poor, resulting in the piston rod and the cylinder body easily colliding or wear when the cylinder pressure is too high, affecting the service life.
A multi-stage buffer mechanism is designed, including a limiting plate, a buffer base, a slide chute, a plastic pressure plate and a buffer spring. It is buffered through a multi-stage slide chute and a sliding assembly to ensure that the piston slide rod has multi-stage buffer protection when reset. Reduce the impact force on the cylinder body.
It effectively avoids collision and wear between the piston slide rod and the cylinder body, extends the service life of the hydraulic cylinder, and ensures smooth and safe movement.
Smart Images
Figure CN222254504U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of double-beam crane driving, in particular to a hydraulic cylinder used for the double-beam crane. 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 it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are indispensable.
[0003] The existing hydraulic cylinder has a poor buffering effect when the piston rod is in reciprocating motion. When the cylinder pressure is too high, the piston rod and the cylinder body are prone to collision or wear, which affects the service life of the hydraulic cylinder and is very inconvenient. Therefore, it is necessary to develop a hydraulic cylinder that can buffer the piston rod when it is reset. Utility Model Content
[0004] The utility model aims to provide a hydraulic oil cylinder for a double-beam crane, which has an ingenious structure and can buffer the piston rod when it is reset, thereby protecting the hydraulic oil cylinder and is safe and practical.
[0005] The technical scheme for realizing the purpose of the utility model is as follows: the utility model comprises an oil cylinder body, a mounting cover arranged on the oil cylinder body, a piston slide rod slidably arranged on the mounting cover, and a movable plug fixed on the piston slide rod and slidably arranged in the oil cylinder body; a limit plate coaxially arranged with the piston slide rod is provided on the piston slide rod, the limit plate is located outside the oil cylinder body, a plurality of multi-stage buffer mechanisms for buffering the piston slide rod when it is reset are provided between the limit plate and the mounting cover, the multi-stage buffer mechanism comprises a buffer base fixed on the mounting cover, a first buffer seat slidably arranged on the buffer base, a second buffer seat slidably arranged on the first buffer seat, and a limit rod arranged on the limit plate, a first slide groove for sliding the first buffer seat is provided on the buffer base, the groove bottom diameter of the first slide groove is smaller than the port diameter, a second slide groove for sliding the second buffer seat is provided on the first buffer seat, the groove bottom diameter of the second slide groove is smaller than the port diameter, a third slide groove for sliding the limit rod is provided on the second buffer seat, the first buffer seat is close to one end of the first slide groove A plurality of first plastic pressure plates are provided along the circumference of the axis of the first buffer seat, each of the first plastic pressure plates is provided with a first plastic pressure block, a plurality of second plastic pressure plates are provided at one end of the second buffer seat close to the second slide groove, and a second plastic pressure block is provided on each of the second plastic pressure plates, a plurality of first limiting grooves are provided in the first slide groove along the circumference of the axis of the first slide groove, each first limiting groove is parallel to the extension direction of the inner wall of the first slide groove and is adapted to each first plastic pressure block, a plurality of second limiting grooves are provided in the second slide groove along the circumference of the axis of the second slide groove, each second limiting groove is parallel to the extension direction of the inner wall of the second slide groove and is adapted to each second plastic pressure block, each limiting rod extends into the third slide groove when the piston slide rod is reset, each second plastic pressure plate on the second buffer seat performs primary buffering through the cooperation of each second plastic pressure block and the second limiting groove, and each first plastic pressure plate on the first buffer seat performs secondary buffering through the cooperation of each first plastic pressure block and the first limiting groove.
[0006] Furthermore, the above-mentioned first limiting groove includes a first sliding groove and a first buffer groove, the extension direction of the first sliding groove is set parallel to the axis of the first sliding groove, one end of the first buffer groove is connected to the first sliding groove, and the other end of the first buffer groove extends to the bottom of the first sliding groove, the first plastic pressure block is slidably set in the first limiting groove, and the second limiting groove includes a second sliding groove and a second buffer groove, the extension direction of the second sliding groove is set parallel to the axis of the second sliding groove, one end of the second buffer groove is connected to the second sliding groove, and the other end of the second buffer groove extends to the bottom of the second sliding groove, and the first sliding groove and the second sliding groove are coaxial.
[0007] Furthermore, a buffer spring is provided in the first buffer groove and the second buffer groove, the extension direction of the buffer spring in the first buffer groove is the same as the extension direction of the first buffer groove, and one end of the buffer spring in the first buffer groove is fixed at the bottom of the first buffer groove, and the other end of the buffer spring acts on the first plastic pressure block after the first plastic pressure block enters the first buffer groove, the extension direction of the buffer spring of the second buffer groove is the same as the extension direction of the second buffer groove, and one end of the buffer spring in the second buffer groove is fixed at the bottom of the second buffer groove, and the other end of the buffer spring acts on the second plastic pressure block after the second plastic pressure block enters the second buffer groove.
[0008] Furthermore, the above-mentioned limit rod is provided with a plurality of limit sliding holes distributed along the circumference of the axis of the limit rod, the axis of each limit sliding hole is arranged perpendicular to the axis of the limit rod, and each limit sliding hole is provided with a return spring, one end of the return spring is fixed at the bottom of each limit sliding hole, and the other end of the return spring is provided with a limit ball, the limit ball is slidably arranged in the corresponding limit sliding hole, and the third slide groove is provided with a first annular groove coaxially arranged with the third slide groove, and each limit ball extends into the first annular groove through the continuous action of the return spring after each limit rod is inserted into the corresponding third slide groove.
[0009] Furthermore, the third slide groove is provided with a first guide surface for guiding the limiting rod into the third slide groove, and the first annular groove is provided with a second guide surface for guiding each limiting ball into the first annular groove or out of the first annular groove.
[0010] Furthermore, the bottoms of the first chute, the second chute and the third chute are all provided with buffer pads.
[0011] The utility model has positive effects: (1) the utility model performs multi-stage limit buffering on the piston slide rod by arranging multiple multi-stage buffering mechanisms between the limit plate and the mounting cover, and the cross-sections of the first slide groove and the second slide groove are arranged to be gradually changed in diameter, and the diameters of the first slide groove and the second slide groove gradually decrease from the port to the groove bottom, and multiple first plastic pressure plates are arranged on the first buffer seat, and the sliding of the first buffer seat is buffered at the secondary level by the elasticity of each first plastic pressure plate and the cooperation of each first plastic pressure block and the first limit groove, and the sliding of the second buffer seat is buffered at the primary level by the elasticity of the second plastic pressure plate and the cooperation of each second plastic pressure block and the second limit groove. The cooperation of the limit rod and the first slide groove and the preliminary buffering effectively solve the problem in the prior art that when the oil cylinder pressure is too large, the piston slide rod causes collision or damage to the oil cylinder body, affecting the service life of the oil cylinder. The pressure of the piston slide rod is buffered by multi-stage buffering, which reduces the pressure caused by the piston slide rod on the oil cylinder body and ensures the service life of the oil cylinder body. The structure is ingenious and convenient and practical.
[0012] (2) The utility model sets the first limiting groove as a connection between the first sliding groove and the first buffer groove, and sets the second limiting groove as a connection between the second sliding groove and the second buffer groove. The first plastic sliding block now slides in the first sliding groove, and then performs buffering in the first buffer groove. Because the diameter of the first buffer groove is gradually decreasing, the first plastic pressure plate begins to deform due to its own elasticity, thereby performing buffering on the first buffer seat. Similarly, the diameter of the second buffer groove is also decreasing. Therefore, buffering is also performed during the sliding process of the second buffer seat, thereby avoiding damage to the inner walls of the first sliding groove and the second sliding groove due to the instantaneous impact force of the first buffer seat and the second buffer seat, which is safe and efficient.
[0013] (3) The utility model buffers the impact force exerted on the first buffer seat and the second buffer seat by arranging buffer springs in the first buffer groove and the second buffer groove, thereby realizing multi-level buffering, effectively ensuring the buffering of the piston slide rod during reciprocating motion, and being convenient and practical.
[0014] (4) The utility model provides a limiting sliding hole on the limiting rod. The cooperation between the limiting sliding hole and the limiting ball can ensure the positioning connection between the limiting rod and the second buffer seat on the one hand, and prevent the limiting ball from being separated from the second buffer seat on the other hand. The utility model is safe and practical.
[0015] (5) The utility model guides the limit rod into the third slide groove by setting a first guide surface on the third slide groove, thereby avoiding hard collision between the limit rod and the third slide groove. By setting a second guide surface, it is convenient to guide the limit ball into the first annular groove for positioning and clamping with the first annular groove, and it is also convenient to export the limit ball when the limit rod is separated from the second buffer seat, which is convenient and practical.
[0016] (6) The utility model provides buffer pads at the bottom of the first slide groove, the second slide groove and the third slide groove. On the one hand, the sliding of the limit rod, the first buffer seat and the second buffer seat can be buffered. On the other hand, the buffer pads can reduce the impact force on the limit rod, the first buffer seat and the second buffer seat, which is safe and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.
[0018] Figure 1 It is a cross-sectional view of the overall structure of the hydraulic cylinder used for the double-beam crane in the utility model;
[0019] Figure 2 It is a cross-sectional view of the overall structure of the multi-stage buffer mechanism in the utility model;
[0020] Figure 3It is a cross-sectional view of the overall structure of the buffer base in the utility model;
[0021] Figure 4 It is a cross-sectional view of the overall structure of the first buffer seat in the utility model;
[0022] Figure 5 It is a cross-sectional view of the overall structure of the second buffer seat in the utility model;
[0023] Figure 6 It is a cross-sectional view of the overall structure of the limiting rod in the utility model. DETAILED DESCRIPTION
[0024] See Figures 1 to 6The utility model comprises an oil cylinder body 1, a mounting cover 2 arranged on the oil cylinder body 1, a piston slide rod 3 slidably arranged on the mounting cover 2, and a movable plug 31 fixed on the piston slide rod 3 and slidably arranged in the oil cylinder body 1; a limit plate 32 coaxially arranged with the piston slide rod 3 is provided on the piston slide rod 3, the limit plate 32 is located outside the oil cylinder body 1, and a plurality of multi-stage buffer mechanisms 5 are provided between the limit plate 32 and the mounting cover 2 for buffering the piston slide rod 3 when resetting. The multi-stage buffer mechanism 5 comprises a buffer base 51 fixed on the mounting cover 2, a first buffer base 51 slidably arranged on the buffer base 51, and a second buffer base 51 is provided on the piston slide rod 3. A buffer seat 52, a second buffer seat 53 slidably arranged on the first buffer seat 52, and a limiting rod 4 arranged on the limiting plate 32, a first slide groove 54 is provided on the buffer base 51 for the first buffer seat 52 to slide, the bottom diameter of the first slide groove 54 is smaller than the port diameter, the first buffer seat 52 is provided with a second slide groove 56 for the second buffer seat 53 to slide, the bottom diameter of the second slide groove 56 is smaller than the port diameter, the second buffer seat 53 is provided with a third slide groove 58 for the limiting rod 4 to slide, and the end of the first buffer seat 52 close to the first slide groove 54 is provided with a plurality of circular grooves along the axis of the first buffer seat 52 The first plastic pressure plates 511 are distributed, and each of the first plastic pressure plates 511 is provided with a first plastic pressure block 512. The end of the second buffer seat 53 close to the second slide groove 56 is provided with a plurality of second plastic pressure plates 531 distributed along the axis of the second buffer seat 53. Each of the second plastic pressure plates 531 is provided with a second plastic pressure block 532. The first slide groove 54 is provided with a plurality of first limiting grooves 55 distributed along the axis of the first slide groove 54 in the first slide groove 54. Each of the first limiting grooves 55 is parallel to the extension direction of the inner wall of the first slide groove 54 and is adapted to each of the first plastic pressure blocks 512. The second slide groove 5 6 is provided with a plurality of second limiting grooves 57 distributed in the second slide groove 56 along the axis circumference of the second slide groove 56, each second limiting groove 57 is parallel to the extension direction of the inner wall of the second slide groove 56 and is adapted to each second plastic pressure block 532, each limiting rod 4 extends into the third slide groove 58 when the piston slide rod 3 is reset, each second plastic pressure plate 531 on the second buffer seat 53 performs primary buffering through the cooperation of each second plastic pressure block 532 and the second limiting groove 57, and each first plastic pressure plate 511 on the first buffer seat 52 performs secondary buffering through the cooperation of each first plastic pressure block 512 and the first limiting groove 55.
[0025] The first limiting groove 55 includes a first sliding groove 551 and a first buffer groove 552. The extension direction of the first sliding groove 551 is set parallel to the axis of the first sliding groove 54. One end of the first buffer groove 552 is connected to the first sliding groove 551, and the other end of the first buffer groove 552 extends to the bottom of the first sliding groove 54. The first plastic pressing block 512 is slidably set in the first limiting groove 55. The second limiting groove 57 includes a second sliding groove 571 and a second buffer groove 572. The extension direction of the second sliding groove 571 is set parallel to the axis of the second sliding groove 56. One end of the second buffer groove 572 is connected to the second sliding groove 571, and the other end of the second buffer groove 572 extends to the bottom of the second sliding groove 56. The first sliding groove 54 and the second sliding groove 56 are coaxial.
[0026] A buffer spring 50 is provided in both the first buffer groove 552 and the second buffer groove 572. The extension direction of the buffer spring 50 in the first buffer groove 552 is the same as that of the first buffer groove 552, and one end of the buffer spring 50 in the first buffer groove 552 is fixed to the bottom of the first buffer groove 552, and the other end of the buffer spring 50 acts on the first plastic pressure block 512 after the first plastic pressure block 512 enters the first buffer groove 552. The extension direction of the buffer spring 50 in the second buffer groove 572 is the same as that of the second buffer groove 572, and one end of the buffer spring 50 in the second buffer groove 572 is fixed to the bottom of the second buffer groove 572, and the other end of the buffer spring 50 acts on the second plastic pressure block 532 after the second plastic pressure block 532 enters the second buffer groove 572.
[0027] The limit rod 4 is provided with a plurality of limit sliding holes 41 distributed along the circumference of the axis of the limit rod 4, the axis of each limit sliding hole 41 is arranged perpendicular to the axis of the limit rod 4, each limit sliding hole 41 is provided with a return spring 42, one end of the return spring 42 is fixed to the bottom of each limit sliding hole 41, and the other end of the return spring 42 is provided with a limit ball 43, the limit ball 43 is slidably arranged in the corresponding limit sliding hole 41, the third sliding groove 58 is provided with a first annular groove 581 coaxially arranged with the third sliding groove 58, and each limit ball 43 extends into the first annular groove 581 through the continuous action of the return spring 42 after each limit rod 4 is inserted into the corresponding third sliding groove 58.
[0028] The third slide groove 58 is provided with a first guide surface 582 for guiding the limiting rod 4 into the third slide groove 58 , and the first annular groove 581 is provided with a second guide surface 583 for guiding each limiting ball 43 into or out of the first annular groove 581 .
[0029] Buffer pads 59 are disposed at the bottoms of the first sliding groove 54 , the second sliding groove 56 and the third sliding groove 58 .
[0030] Working principle of the utility model: in the process of resetting the piston slide rod 3 in the utility model, each limit rod 4 on the limit plate 32 is introduced into the corresponding third slide groove 58 through the first guide surface 582, and each limit rod 4 enters the first annular groove 581 through the guidance of the third slide groove 58 on the second buffer seat 53 and the cooperation of the second guide surface 583. When the limit rod 4 is pressed against the buffer pad 59 at the bottom of the third slide groove 58, the preliminary buffering is completed, and then the second buffer seat 53 starts to slide in the second slide groove 56 of the first buffer seat 52 under the action of the limit rod 4, and the second plastic pressing block 532 of each second plastic pressing plate 531 on the second buffer seat 53 now slides linearly in the second sliding seat, and then each second plastic pressing block 532 enters the second buffer groove 572, and the buffer spring 50 in the second buffer groove 572 starts to buffer the second plastic pressing block 532, and the elasticity of the second plastic pressing plate 531 itself ensures the second buffer The seat 53 will not be separated from the first buffer seat 52. The second plastic pressure block 532 completes the first buffer after pressing the reset spring 42. Then the first buffer seat 52 slides in the first slide groove 54 on the buffer base 51 driven by the second buffer seat 53. The first buffer seat 52 now slides horizontally in the first slide groove 54, and then each first plastic pressure block 512 slides horizontally in the first sliding groove 551, and then enters the first buffer groove 552 for Hua Chong sliding, and is buffered by the reset spring 42 to complete the second buffer. Through the effects of the initial buffer, the first buffer and the second buffer, the problem of collision between the piston slide rod 3 and the cylinder body 1 when the cylinder pressure is too large in the prior art is effectively reduced. The impact force generated by the piston slide rod 3 during sliding reset is effectively reduced through multi-stage buffering, which greatly reduces the impact of the piston slide rod 3 on the cylinder body 1. The structure is ingenious and efficient and convenient.
[0031] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A hydraulic cylinder for a double-beam crane, comprising a cylinder body, a mounting cover arranged on the cylinder body, a piston slide rod slidably arranged on the mounting cover, and a movable plug fixed on the piston slide rod and slidably arranged in the cylinder body; characterized in that: The piston slide rod is provided with a limit plate coaxially arranged with the piston slide rod, the limit plate is located outside the oil cylinder body, and a plurality of multi-stage buffer mechanisms are provided between the limit plate and the mounting cover for buffering when the piston slide rod is reset. The multi-stage buffer mechanism includes a buffer base fixed on the mounting cover, a first buffer seat slidably arranged on the buffer base, a second buffer seat slidably arranged on the first buffer seat, and a limit rod arranged on the limit plate, the buffer base is provided with a first slide groove for the first buffer seat to slide, the groove bottom diameter of the first slide groove is smaller than the port diameter, the first buffer seat is provided with a second slide groove for the second buffer seat to slide, the groove bottom diameter of the second slide groove is smaller than the port diameter, the second buffer seat is provided with a third slide groove for the limit rod to slide, and the first buffer seat is provided with a plurality of first plastic pressure plates distributed along the circumference of the axis of the first buffer seat at one end close to the first slide groove, and each first plastic pressure plate is provided with a first plastic The cam is an assembly made of a plurality of plastic pressure plates, each of which is adapted to move the first and second plastic pressure plates together to form a plurality of first limit grooves, each of which is parallel to the extension direction of the inner wall of the first slide groove and is adapted to the first plastic pressure plates. The cam is an assembly made of a plurality of plastic pressure plates, each of which is adapted to move the first and second plastic pressure plates together to form a plurality of first limit grooves. The cam is an assembly made of a plurality of plastic pressure plates, each of which is adapted to move the first and second plastic pressure plates together to form a plurality of first limit grooves.
2. The hydraulic cylinder for a double-beam crane according to claim 1, characterized in that: The first limiting groove includes a first sliding groove and a first buffer groove, the extension direction of the first sliding groove is parallel to the axis of the first sliding groove, one end of the first buffer groove is connected to the first sliding groove, and the other end of the first buffer groove extends to the bottom of the first sliding groove, and the first plastic pressure block is slidably set in the first limiting groove, and the second limiting groove includes a second sliding groove and a second buffer groove, the extension direction of the second sliding groove is parallel to the axis of the second sliding groove, one end of the second buffer groove is connected to the second sliding groove, and the other end of the second buffer groove extends to the bottom of the second sliding groove, and the first sliding groove and the second sliding groove are coaxial.
3. The hydraulic cylinder for a double-beam crane according to claim 2, characterized in that: A buffer spring is provided in each of the first buffer groove and the second buffer groove, the extension direction of the buffer spring in the first buffer groove is the same as the extension direction of the first buffer groove, and one end of the buffer spring in the first buffer groove is fixed at the bottom of the first buffer groove, and the other end of the buffer spring acts on the first plastic pressure block after the first plastic pressure block enters the first buffer groove, the extension direction of the buffer spring in the second buffer groove is the same as the extension direction of the second buffer groove, and one end of the buffer spring in the second buffer groove is fixed at the bottom of the second buffer groove, and the other end of the buffer spring acts on the second plastic pressure block after the second plastic pressure block enters the second buffer groove.
4. The hydraulic cylinder for a double-beam crane according to claim 3, characterized in that: The limit rod is provided with a plurality of limit sliding holes distributed along the circumference of the axis of the limit rod, the axis of each limit sliding hole is arranged perpendicular to the axis of the limit rod, each limit sliding hole is provided with a return spring, one end of the return spring is fixed to the bottom of each limit sliding hole, and the other end of the return spring is provided with a limit ball, the limit ball is slidably arranged in the corresponding limit sliding hole, the third slide groove is provided with a first annular groove coaxially arranged with the third slide groove, and each limit ball extends into the first annular groove through the continuous action of the return spring after each limit rod is inserted into the corresponding third slide groove.
5. The hydraulic cylinder for a double-beam crane according to claim 4, characterized in that: The third slide groove is provided with a first guide surface which can guide the limiting rod into the third slide groove, and the first annular groove is provided with a second guide surface which can guide each limiting ball into the first annular groove or out of the first annular groove.
6. The hydraulic cylinder for a double-beam crane according to claim 5, characterized in that: The bottoms of the first chute, the second chute and the third chute are all provided with buffer pads.