Clamping cylinder with cushioning

Abstract

This application discloses a clamping cylinder with a buffer device, belonging to the field of clamping cylinders. The clamping cylinder includes a cylinder body, a pushing chamber fixedly installed on the top of the cylinder body, a rotating shaft mounted on the top of the pushing chamber via a bearing, and a pressure arm fixedly connected to the rotating shaft. A buffer assembly is provided on the side of the pressure arm facing the workpiece. The buffer assembly includes a hydraulic damper mounted on the pressure arm and a buffer plate mounted at the bottom of the pressure arm. The top of the hydraulic damper is fixedly connected to the top of the pressure arm, and the output end of the hydraulic damper passes through the pressure arm and is fixedly connected to the buffer plate. A sleeve plate is fitted on the top of the hydraulic damper, and a buffer spring is fitted between the sleeve plate and the buffer plate on the hydraulic damper. This double buffer not only effectively reduces the impact force of the pressure arm on the workpiece but also makes the buffering process smoother, ensuring the stability and integrity of the workpiece during clamping, thereby improving welding accuracy and production quality.

Description

Technical Field

[0001] This application relates to the field of clamping cylinder technology, specifically a clamping cylinder with a buffer device. Background Technology

[0002] In the mass production scenario of a car body welding line, sheet metal welding operations often require workpieces to be flipped to achieve multi-sided welding. This process places extremely stringent requirements on the stable clamping of the workpieces. If the clamping is unstable, it will not only affect the welding accuracy and lead to a decline in product quality, but may also cause production accidents due to workpiece shaking, seriously restricting production efficiency.

[0003] As a core hydraulic actuator for clamping and fixing workpieces, the performance of clamping cylinders directly affects welding accuracy and production efficiency. They typically consist of key components such as hydraulic cylinders, pistons, cylinder bodies, and fixtures, playing an irreplaceable role in automated welding processes. With the rapid development of the automotive manufacturing industry, the performance requirements for clamping cylinders are increasingly stringent. They need sufficient clamping force to ensure workpiece stability, as well as good adaptability and safety to meet the needs of various working conditions.

[0004] Chinese utility model patent CN221145207U discloses a powerful adjustable clamping cylinder. This technology achieves stepless adjustment through an adjustment structure composed of a threaded rod and an adjusting connecting rod, effectively adapting to clamping requirements with various strokes. This not only reduces equipment adaptation costs but also simplifies mechanical design by replacing the traditional pull rod structure with a threaded rod, offering advantages such as simple structure and convenient adjustment. Furthermore, the adjustment position at the bottom facilitates operation, and combined with a buffer spring and a movable head, it forms effective cushioning protection under the abutment, improving the safety of equipment use.

[0005] However, in actual use, the side of the clamping arm facing the workpiece lacks a buffer device, resulting in a hard impact on the workpiece when the clamping arm clamps it. At the moment of contact between the clamping arm and the workpiece, if the clamping speed is too fast or the clamping force is suddenly applied, the workpiece may break, deform, or suffer surface damage due to the rigid collision. This damage is particularly severe for workpieces made of brittle materials or with high surface precision requirements, thus affecting product quality and production stability.

[0006] Therefore, this application provides a clamping cylinder with a buffer device to solve the above-mentioned problems. Utility Model Content

[0007] This application provides a clamping cylinder with a buffer device, which aims to solve the problems mentioned in the background art, such as the lack of a buffer device on the side of the clamping cylinder arm facing the workpiece, which will generate a hard impact when clamping the workpiece. When the clamping speed is fast or the clamping force is suddenly applied, the workpiece is prone to breakage, deformation or surface damage due to rigid collision, which affects product quality and production stability.

[0008] To achieve the above objectives, this application provides the following technical solution: a clamping cylinder with a buffer device, comprising a cylinder body, a pushing chamber fixedly installed on the top of the cylinder body, a rotating shaft mounted on the top of the pushing chamber via a bearing, and a pressure arm fixedly connected to the rotating shaft. The rotating shaft is connected to the output shaft of the cylinder body via a crank-connecting rod structure. To reduce the impact of the pressure arm on the workpiece: a buffer assembly is provided on the side of the pressure arm facing the workpiece. The buffer assembly includes a hydraulic damper mounted on the pressure arm and a buffer plate mounted at the bottom of the pressure arm. The top of the hydraulic damper is fixedly connected to the top of the pressure arm, and the output end of the hydraulic damper passes through the pressure arm and is fixedly connected to the buffer plate. A sleeve plate is fitted on the top of the hydraulic damper, and a buffer spring is fitted on the hydraulic damper between the sleeve plate and the buffer plate. When the pressure arm moves towards the workpiece under the drive of the cylinder body, the buffer plate contacts the workpiece first, and the workpiece generates a reaction force on the buffer plate. The reaction force is transmitted to the buffer spring, causing it to compress and deform. The spring's elastic potential energy absorbs part of the impact force, initially mitigating the impact. Simultaneously, the hydraulic damper, due to its damping characteristics, resists the movement of the buffer plate, hindering its rapid movement and further reducing the impact speed and force. The two work together, through a dual approach of elastic absorption and damping deceleration, to effectively buffer the impact on the pressure arm, thereby protecting the workpiece and ensuring stable operation.

[0009] Preferably, to reduce the impact of the buffer plate on the workpiece: a first elastic pad is fixedly connected to the end of the buffer plate away from the pressure arm. The first elastic pad has good elasticity and flexibility, and can directly contact the workpiece, further reducing the rigid impact between the buffer plate and the workpiece, and preventing the workpiece surface from being scratched or crushed by the buffer plate. Especially for workpieces with high surface precision requirements, it can effectively protect their surface quality, and at the same time increase the friction between the buffer plate and the workpiece, preventing the workpiece from sliding relative to the workpiece during clamping.

[0010] Preferably, to facilitate the installation of the hydraulic damper: the pressure arm has an installation groove for the hydraulic damper to pass through; two support plates are fixedly connected to the top of the pressure arm corresponding to the outer position of the installation groove; and pins for passing through the hydraulic damper are inserted into the support plates. The installation groove provides positioning space for the installation of the hydraulic damper, ensuring that the hydraulic damper can be accurately installed in the preset position. The cooperation of the two support plates and the pins achieves a stable fixation of the hydraulic damper, preventing the hydraulic damper from shaking or shifting during operation, ensuring the normal operation of the buffer assembly. At the same time, this installation method has a simple structure and facilitates the installation, disassembly, and maintenance of the hydraulic damper.

[0011] Preferably, to ensure the stability of the buffer plate: two guide rods are symmetrically fixedly connected to one end of the buffer plate near the pressure arm. The top of each guide rod slides through the top of the pressure arm and is fixedly connected to a baffle. The guide rods guide the buffer plate during its movement, ensuring that the buffer plate always moves in a preset direction, preventing the buffer plate from shifting or tilting, and ensuring the accuracy and stability of the contact between the buffer plate and the workpiece. The baffle limits the sliding stroke of the guide rods, preventing them from falling off the pressure arm, further ensuring the stable operation of the buffer plate.

[0012] Preferably, a second elastic pad is fitted onto the guide rod and fixedly connected to the baffle. The second elastic pad can buffer the contact between the baffle and the pressure arm, preventing rigid collisions between them, reducing wear, extending the service life of the baffle and the pressure arm, and also reducing noise generated by the collision.

[0013] Preferably, to prevent impact between the buffer plate and the pressure arm, a third elastic pad is fixedly connected to one end of the buffer plate near the pressure arm. The third elastic pad can buffer the buffer plate as it moves toward the pressure arm and is about to make contact, preventing a rigid collision between the buffer plate and the pressure arm and avoiding damage to both due to the collision. It also further enhances the buffering effect of the entire buffer assembly.

[0014] Preferably, to facilitate the adjustment of the spring's elastic potential energy: the top of the hydraulic damper is provided with an external thread, and the inner sidewall of the sleeve is provided with an internal thread adapted to the external thread. Through this threaded engagement, the position of the sleeve on the hydraulic damper can be easily adjusted, thereby changing the initial compression of the buffer spring and adjusting its elastic potential energy. This allows the buffer assembly to be adjusted to a suitable buffering force according to the material, shape, and clamping requirements of different workpieces, improving the applicability of the clamping cylinder.

[0015] Preferably, to facilitate rotating the sleeve plate: multiple protruding rods are fixedly connected to the outer wall of the sleeve plate, and the multiple protruding rods are arranged in a ring at equal intervals along the outer wall of the sleeve plate. The protruding rods increase the friction between the hand and the sleeve plate, making it easier and less strenuous for the operator to rotate the sleeve plate, and allowing for easy adjustment of the sleeve plate's position, thus improving the convenience and efficiency of operation.

[0016] This application utilizes a combination of a buffer spring and a hydraulic damper to create a dual buffering mechanism, significantly improving the buffering effect. When the pressure arm moves the buffer plate closer to and contacts the workpiece, the reaction force generated by the workpiece on the buffer plate is first transmitted to the buffer spring, causing it to compress and deform. The spring's elastic properties absorb some of the impact force. Simultaneously, the hydraulic damper generates a damping force on the movement of the buffer plate, slowing its speed and preventing excessive impact on the workpiece due to excessive speed. This dual buffering not only effectively reduces the impact force of the pressure arm on the workpiece but also makes the buffering process smoother, further preventing problems such as workpiece displacement, breakage, deformation, or surface damage due to impact. This ensures the stability and integrity of the workpiece during clamping, thereby improving welding accuracy and production quality.

[0017] This application allows for easy adjustment of the position of the sleeve plate on the hydraulic damper through threaded connection, thereby changing the initial compression of the buffer spring and adjusting the elastic potential energy of the buffer spring. This enables the buffer assembly to be adjusted to a suitable buffering force according to the material, shape, and clamping requirements of different workpieces, thus improving the applicability of the clamping cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a clamping cylinder with a buffer device.

[0019] Figure 2 for Figure 1 The main view of the structure in the middle;

[0020] Figure 3 This is a schematic diagram of the buffer component.

[0021] In the picture:

[0022] 1. Cylinder body; 2. Push chamber; 3. Rotating shaft; 4. Pressure arm; 41. Mounting groove; 42. Support plate; 5. Buffer assembly; 51. Hydraulic damper; 52. Buffer plate; 53. Sleeve plate; 531. Protruding rod; 54. Buffer spring; 55. First elastic pad; 56. Guide rod; 57. Baffle; 571. Second elastic pad; 58. Third elastic pad. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Example 1

[0025] This embodiment provides a clamping cylinder with a buffer device, such as Figure 1-3 As shown, the clamping cylinder includes a cylinder body 1, a push chamber 2 fixedly installed on the top of the cylinder body 1, a rotating shaft 3 mounted on the top of the push chamber 2 via bearings, and a pressure arm 4 fixedly connected to the rotating shaft 3. The rotating shaft 3 is connected to the output shaft of the cylinder body 1 through a crank-connecting rod structure. To reduce the impact of the pressure arm 4 on the workpiece, a buffer assembly 5 is provided on the side of the pressure arm 4 facing the workpiece. The buffer assembly 5 includes a hydraulic damper 51 installed on the pressure arm 4 and a buffer plate 52 installed at the bottom of the pressure arm 4. The top of the hydraulic damper 51 is fixedly connected to the top of the pressure arm 4, and the output end of the hydraulic damper 51 passes through the pressure arm 4 and is fixedly connected to the buffer plate 52. A sleeve plate 53 is fitted on the top of the hydraulic damper 51, and a buffer spring 54 is fitted on the hydraulic damper 51 between the sleeve plate 53 and the buffer plate 52. Through the cooperation of the buffer spring 54 and the hydraulic damper 51, a double buffering mechanism can be formed, which greatly improves the buffering effect. When the pressure arm 4 moves the buffer plate 52 closer to and into contact with the workpiece, the reaction force generated by the workpiece on the buffer plate 52 is first transmitted to the buffer spring 54, causing the buffer spring 54 to compress and deform. Its elastic properties absorb part of the impact force. Simultaneously, the hydraulic damper 51 generates a damping force on the movement of the buffer plate 52, slowing its movement and preventing excessive impact on the workpiece due to excessive speed. This dual buffering not only effectively reduces the impact force of the pressure arm 4 on the workpiece but also makes the buffering process smoother, further preventing problems such as displacement, breakage, deformation, or surface damage to the workpiece due to impact. This ensures the stability and integrity of the workpiece during clamping, thereby improving welding accuracy and production quality.

[0026] The buffer spring 54 is made of spring steel. Spring steel has high strength, elastic limit, and fatigue strength, ensuring that the buffer spring 54 is not prone to permanent deformation or breakage when subjected to large elastic deformation. This guarantees the long-term stable buffering performance of the buffer spring 54, extends the service life of the buffer assembly 5, and thus ensures that the clamping cylinder maintains a reliable buffering effect on the workpiece during long-term use. When the pressure arm 4 moves the buffer assembly 5 closer to and contacts the workpiece, the workpiece generates a reaction force on the buffer plate 52. The buffer plate 52 transmits this force to the buffer spring 54, causing it to compress and deform. Utilizing the elastic properties of the spring steel, part of the impact force is converted into the elastic potential energy of the spring, thereby reducing the impact force of the pressure arm 4 on the workpiece.

[0027] To reduce the impact of the buffer plate 52 on the workpiece, a first elastic pad 55 is fixedly connected to the end of the buffer plate 52 away from the pressure arm 4. The first elastic pad 55 has good elasticity and flexibility, allowing it to directly contact the workpiece, further reducing the rigid impact between the buffer plate 52 and the workpiece, preventing scratches or pressure marks on the workpiece surface. This is especially beneficial for workpieces with high surface precision requirements, effectively protecting their surface quality. Simultaneously, it increases the friction between the buffer plate 52 and the workpiece, preventing relative sliding of the workpiece during clamping. When the buffer plate 52 approaches and contacts the workpiece, the first elastic pad 55 first contacts the workpiece. Due to its elastic properties, it undergoes a certain deformation, further buffering and dispersing the force transmitted from the buffer plate 52, reducing the pressure on the workpiece per unit area, thereby reducing the risk of impact and damage to the workpiece.

[0028] To facilitate the installation of the hydraulic damper 51, the pressure arm 4 has an installation groove 41 for the hydraulic damper 51 to pass through. Two support plates 42 are fixedly connected to the top of the pressure arm 4, corresponding to the outer side of the installation groove 41. Pins that pass through the hydraulic damper 51 are inserted into the support plates 42. The installation groove 41 provides positioning space for the installation of the hydraulic damper 51, ensuring that the hydraulic damper 51 can be accurately installed in the preset position. The cooperation of the two support plates 42 and the pins achieves a stable fixation of the hydraulic damper 51, preventing it from shaking or shifting during operation, ensuring the normal operation of the buffer assembly 5. This installation method is also simple in structure, facilitating the installation, disassembly, and maintenance of the hydraulic damper 51. During installation, the hydraulic damper 51 is passed through the mounting groove 41 on the pressure arm 4 to initially position the hydraulic damper 51. Then, the pin is passed through the support plate 42 and the hydraulic damper 51. By utilizing the cooperation between the pin, the support plate 42, and the hydraulic damper 51, the hydraulic damper 51 is firmly fixed on the pressure arm 4, thereby achieving stable installation of the hydraulic damper 51.

[0029] To ensure the stability of the buffer plate 52, two guide rods 56 are symmetrically fixedly connected to one end of the buffer plate 52 near the pressure arm 4. The top of the guide rods 56 slides through the top of the pressure arm 4 and is fixedly connected to a baffle 57. The guide rods 56 can guide the buffer plate 52 during its movement, ensuring that the buffer plate 52 always moves in the preset direction, preventing the buffer plate 52 from shifting or tilting, and ensuring the accuracy and stability of the contact between the buffer plate 52 and the workpiece. The baffle 57 can limit the sliding stroke of the guide rods 56, preventing the guide rods 56 from falling off the pressure arm 4, further ensuring the stable operation of the buffer plate 52. When the buffer plate 52 moves toward the pressure arm 4 due to the reaction force of the workpiece, the buffer plate 52 drives the guide rod 56 to slide on the pressure arm 4. The sliding direction of the guide rod 56 is constrained by the pressure arm 4, thus ensuring that the buffer plate 52 can only move along the axial direction of the guide rod 56. When the guide rod 56 slides to a certain extent, the baffle 57 contacts the top of the pressure arm 4, preventing the guide rod 56 from continuing to slide, thereby limiting the movement stroke of the buffer plate 52.

[0030] A second elastic pad 571, fixedly connected to the baffle 57, is fitted onto the guide rod 56. The second elastic pad 571 acts as a buffer when the baffle 57 contacts the pressure arm 4, preventing rigid collisions between them, reducing wear, extending their service life, and lowering noise from the impact. When the guide rod 56 moves the baffle 57 closer to and into contact with the pressure arm 4, the second elastic pad 571 first contacts the pressure arm 4. Due to its elastic properties, it deforms, buffering and absorbing the impact force of the baffle 57, thus reducing the direct impact of the baffle 57 on the pressure arm 4.

[0031] To prevent impact between the buffer plate 52 and the pressure arm 4, a third elastic pad 58 is fixedly connected to one end of the buffer plate 52 near the pressure arm 4. The third elastic pad 58 acts as a buffer when the buffer plate 52 moves towards the pressure arm 4 and is about to make contact, preventing a rigid collision between the buffer plate 52 and the pressure arm 4 and avoiding damage to both. It also further enhances the overall buffering effect of the buffer assembly 5. When the buffer plate 52 moves towards the pressure arm 4 under the action of the reaction force, and the two are about to make contact, the third elastic pad 58 contacts the pressure arm 4 first, using its elastic deformation to absorb part of the impact force, thereby reducing the collision force between the buffer plate 52 and the pressure arm 4.

[0032] Example 2

[0033] Unlike Embodiment 1, to facilitate the adjustment of the elastic potential energy of the buffer spring 54, the top of the hydraulic damper 51 is provided with an external thread, and the inner sidewall of the sleeve 53 is provided with an internal thread for matching the external thread. Through the threaded engagement, the position of the sleeve 53 on the hydraulic damper 51 can be easily adjusted, thereby changing the initial compression of the buffer spring 54 and adjusting its elastic potential energy. This allows the buffer assembly 5 to be adjusted to a suitable buffering force according to the material, shape, and clamping requirements of different workpieces, improving the applicability of the clamping cylinder. When it is necessary to adjust the elastic potential energy of the buffer spring 54, the sleeve 53 is rotated. Since the sleeve 53 is connected to the hydraulic damper 51 by threads, the sleeve 53 will move up and down along the axial direction of the hydraulic damper 51, thereby changing the distance between the sleeve 53 and the buffer plate 52. When the sleeve 53 moves downward, the initial compression of the buffer spring 54 increases, and the elastic potential energy increases; when the sleeve 53 moves upward, the initial compression of the buffer spring 54 decreases, and the elastic potential energy decreases.

[0034] To facilitate the rotation of the sleeve plate 53, multiple protruding rods 531 are fixedly connected to the outer wall of the sleeve plate 53. These protruding rods 531 are arranged in a ring at equal intervals along the outer wall of the sleeve plate 53. The protruding rods 531 increase the friction between the hand and the sleeve plate 53, making it easier and less strenuous for the operator to rotate the sleeve plate 53. This allows for easy adjustment of the sleeve plate 53's position, improving operational convenience and efficiency. When the operator needs to rotate the sleeve plate 53, they grasp the protruding rods 531. Because the protruding rods 531 protrude from the outer wall of the sleeve plate 53, the contact area and friction between the hand and the sleeve plate 53 are increased. The force applied by the operator can be more effectively transmitted to the sleeve plate 53, thereby rotating the sleeve plate 53 and adjusting its position.

[0035] In the high-stability tilting cylinder of this application, the crank-connecting rod structure is a key component for power transmission and motion conversion. It mainly consists of a crank, a connecting rod, and connecting parts that cooperate with both. The crank is typically a rod with an eccentric journal, one end of which is fixedly connected to the output shaft of the cylinder body 1. When the cylinder body 1 operates, the output shaft performs linear reciprocating motion, driving the connected crank to rotate around a fixed axis. The connecting rod connects the crank and the rotating shaft 3; one end is rotatably connected to the eccentric journal of the crank via a pin or other means, and the other end is also rotatably connected to the rotating shaft 3. During operation, as the crank rotates, the connecting rod performs complex planar motion, converting the crank's rotational motion into pushing and pulling on the rotating shaft 3, thereby driving the rotating shaft 3 to rotate around its own axis. Since the rotating shaft 3 is fixedly connected to the pressure arm 4, the pressure arm 4 ultimately rotates synchronously with the rotating shaft 3, completing the clamping and tilting action of the workpiece. Through this ingenious crank-connecting rod structure design, the linear motion output by the cylinder body 1 can be efficiently and stably converted into the rotational motion required by the pressure arm 4, providing strong support for the reliable operation of the clamping cylinder.

[0036] It should be noted that many of the standard parts used in this application are available on the market, while non-standard parts can be specially customized. The connection method used in this application is also a very common method in the mechanical field, and will not be described in detail here.

[0037] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A clamping cylinder with a buffer device, comprising a cylinder body (1), a push chamber (2) fixedly installed on the top of the cylinder body (1), a rotating shaft (3) mounted on the top of the push chamber (2) via a bearing, and a pressure arm (4) fixedly connected to the rotating shaft (3), wherein the rotating shaft (3) is connected to the output shaft of the cylinder body (1) via a crank-connecting rod structure; characterized in that A buffer assembly (5) is provided on the side of the pressure arm (4) facing the workpiece. The buffer assembly (5) includes a hydraulic damper (51) provided on the pressure arm (4) and a buffer plate (52) provided at the bottom of the pressure arm (4). The top of the hydraulic damper (51) is fixedly connected to the top of the pressure arm (4). The output end of the hydraulic damper (51) passes through the pressure arm (4) and is fixedly connected to the buffer plate (52). A sleeve plate (53) is sleeved on the top of the hydraulic damper (51). A buffer spring (54) is provided on the hydraulic damper (51) between the sleeve plate (53) and the buffer plate (52).

2. The clamping cylinder with a buffer device according to claim 1, characterized in that: The buffer plate (52) is fixedly connected to a first elastic pad (55) at the end away from the pressure arm (4).

3. The clamping cylinder with a buffer device according to claim 1, characterized in that: The pressure arm (4) has an installation groove (41) for the hydraulic damper (51) to pass through. Two support plates (42) are fixedly connected to the top of the pressure arm (4) at the outer position of the installation groove (41). A pin for passing through the hydraulic damper (51) is inserted into the support plate (42).

4. The clamping cylinder with a buffer device according to claim 1, characterized in that: Two guide rods (56) are symmetrically fixedly connected to one end of the buffer plate (52) near the pressure arm (4). The top of the guide rod (56) slides through the top of the pressure arm (4) and is fixedly connected to a baffle (57).

5. Clamping cylinder with damping device according to claim 4, characterized in that A second elastic pad (571) is fitted onto the guide rod (56) and fixedly connected to the baffle (57).

6. The clamping cylinder with a buffer device according to claim 1, characterized in that: A third elastic pad (58) is fixedly connected to one end of the buffer plate (52) near the pressure arm (4).

7. The clamping cylinder with a buffer device according to claim 1, characterized in that: The top of the hydraulic damper (51) is provided with an external thread, and the inner sidewall of the sleeve (53) is provided with an internal thread for matching the external thread.

8. Clamping pneumatic cylinder with damping device according to claim 7, characterized in that The outer wall of the sleeve (53) is fixedly connected with a plurality of protruding rods (531), which are arranged in a ring at equal intervals along the outer wall of the sleeve (53).

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