Stretching pad cylinder

Abstract

The utility model discloses a kind of stretching pad oil cylinders, belong to hydraulic press equipment field.The technical scheme is that a kind of stretching pad oil cylinder, including cylinder body, the refrigerant passage is equipped in the cylinder body, the refrigerant passage is at a certain distance between the inner wall and bottom surface of the cylinder body.This scheme ingeniously utilizes the feature that there is no piston inside stretching pad oil cylinder, sets up refrigerant passage in cylinder body, directly cools the hydraulic oil in cylinder body, makes full use of the cold of refrigerant, so that cold almost completely acts on hydraulic oil, greatly improves cooling efficiency, and more effectively cools the soaking structure in cylinder body.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic press equipment, and in particular to a stretching pad cylinder. Background Technology

[0002] The stretching pad is a key component in press equipment used for stretching and forming metal sheets. It is mainly used in the sheet metal processing of mechanical engineering fields. It provides stable support, adjustment and locking functions for the stretching action of the press to ensure the forming accuracy and quality stability of the metal sheet during the stretching process.

[0003] When the press stretch pad is working, it generates a lot of heat. The stretch pad is mainly cooled by immersing its moving parts in the stretch pad cylinder with the hydraulic oil in the cylinder. When the cycle time is high or the tonnage and stroke of the stretch pad are large, the heat generated increases sharply. Natural cooling efficiency is low and heat cannot be dissipated in time, which will cause the hydraulic oil temperature to be too high, making the equipment unusable.

[0004] Currently, the common approach is to further actively cool the hydraulic cylinder by adding a cooling structure to the outside of the cylinder, such as the hydraulic cylinder disclosed in patent document CN118601989UA, which dissipates heat by adding a cooling sleeve to the outside of the cylinder body. However, adding a cooling structure to the outside of the cylinder body will also cause the cooling energy to affect the external environment, resulting in low cooling efficiency for the cylinder. Summary of the Invention

[0005] This invention addresses the problem of low heat dissipation efficiency in current stretch pad cylinders that use external heat dissipation structures, and provides a stretch pad cylinder with internal heat dissipation.

[0006] To solve the above problems, the technical solution adopted by this utility model is a stretch pad cylinder, including a cylinder body, wherein a refrigerant channel is provided inside the cylinder body, and the refrigerant channel is spaced a certain distance from the inner wall and bottom surface of the cylinder body. This solution cleverly utilizes the characteristic that the stretch pad cylinder has no piston inside, and sets the refrigerant channel inside the cylinder body to directly cool the hydraulic oil inside the cylinder body. It makes full use of the cooling capacity of the refrigerant, so that the cooling capacity is almost entirely applied to the hydraulic oil, which greatly improves the cooling efficiency and achieves more effective cooling of the immersion structure inside the cylinder body.

[0007] As a preferred embodiment of a tension pad hydraulic cylinder, the refrigerant channel is spiral-shaped and coaxially arranged with the cylinder body. The upper end of the refrigerant channel bends radially outward to form a pipe inlet, which exits the cylinder body. The lower end of the refrigerant channel bends radially outward to form a pipe outlet, which also exits the cylinder body. Both the pipe inlet and outlet are fixedly connected to the cylinder body. The spiral structure significantly increases the contact area between the refrigerant channel and the hydraulic oil in the cylinder. Combined with the coaxial arrangement with the cylinder body, it ensures that the refrigerant channel is evenly distributed within the cylinder, allowing all areas of the hydraulic oil to fully contact the refrigerant channel and preventing localized overheating. The radially bent pipe inlet and outlet exiting the cylinder body and being fixed improves structural stability, facilitates connection to external refrigerant supply lines, and reduces installation difficulty.

[0008] As a preferred implementation of the tension pad cylinder, a flow valve is connected to the pipe inlet and / or the pipe outlet. By setting a flow valve at the pipe inlet or outlet, the circulation flow rate of the refrigerant in the channel can be flexibly adjusted, making the cooling process more in line with the actual oil temperature change requirements, taking into account both cooling efficiency and energy saving, and adapting to the oil temperature cooling requirements under different processing cycles and loads, thus improving the applicability of the device.

[0009] As a preferred implementation of the tension pad cylinder, a shut-off valve is also connected to the pipe inlet and / or the pipe outlet. This shut-off valve is a manual valve. The manual shut-off valve allows for complete disconnection of the refrigerant supply during equipment maintenance, shutdown, and when active cooling is not required. This prevents refrigerant leakage or external impurities from entering the passage, ensuring maintenance safety and passage cleanliness. Compared to automatic valves, manual shut-off valves do not require prolonged standby of electronic equipment, preventing opening due to power failure and improving the safety of equipment operation.

[0010] As a preferred embodiment of a tension pad hydraulic cylinder, the inner wall of the cylinder body is provided with multiple fixing clips, and the refrigerant channel is fixedly installed on the fixing clips. The fixing clips can provide stable support and limit the refrigerant channel inside the cylinder, preventing the channel from shaking or shifting due to water flow impact or hydraulic oil flow when the refrigerant circulates at high speed in the channel. This also prevents the channel from colliding with the inner wall of the cylinder and causing wear, reduces the tensile force on the pipe inlet and outlet, and extends the service life of the refrigerant channel. At the same time, the fixed installation method ensures that the refrigerant channel always maintains a distance from the inner wall and bottom of the cylinder, preventing the channel from sticking to the cylinder body and causing localized loss of cold energy. This ensures that the cold energy is fully applied to the hydraulic oil and maintains a highly efficient cooling effect.

[0011] As a preferred embodiment of the tension pad cylinder, in a top view, multiple fixing clips are evenly arranged circumferentially on the cylinder body. This ensures that each circumferential position of the refrigerant passage is subjected to a balanced fixing force, preventing passage deformation or local loosening due to uneven force at fixing points, and further improving the stability of the refrigerant passage installation.

[0012] As a preferred embodiment of a stretch pad cylinder, the flow valve is a solenoid valve, and a temperature sensor is also installed inside the cylinder, electrically connected to the flow valve. The temperature sensor can detect the hydraulic oil temperature inside the cylinder in real time and adjust the solenoid valve opening based on the temperature signal to achieve automatic regulation of the refrigerant flow. When the oil temperature exceeds a preset threshold, the solenoid valve automatically increases its opening to increase the refrigerant flow and rapidly cool the oil; when the oil temperature is below the threshold, the solenoid valve automatically decreases its opening to reduce cooling energy consumption. It can also accurately respond to oil temperature changes, ensuring that the hydraulic oil is always at a suitable operating temperature and improving the operational stability of the stretch pad cylinder. As a preferred embodiment of the tension pad cylinder, the temperature sensor is located at the center of the bottom surface of the cylinder body cavity. The temperature sensor is positioned at the center of the bottom surface of the cylinder body cavity, equidistant from the surrounding refrigerant pipes. This location allows for a more accurate reflection of the overall temperature of the hydraulic oil within the cylinder, while its distance from the cylinder body sidewalls reduces interference from the external environment on the local oil temperature.

[0013] As a preferred embodiment of the stretch pad cylinder, the outer wall of the cylinder body is provided with heat dissipation fins. The heat dissipation fins can increase the contact area between the cylinder body and the outside air, allowing the cylinder body to dissipate more heat through thermal radiation and thermal convection, forming a dual cooling structure of internal refrigerant cooling combined with external fin heat dissipation, which greatly improves the overall heat dissipation efficiency; at the same time, it can improve heat dissipation efficiency and delay the rise of oil temperature without turning on the refrigerant active cooling.

[0014] As a preferred embodiment of a tension pad hydraulic cylinder, the heat dissipation fins are arranged along the axial section of the cylinder body, and multiple heat dissipation fins are evenly arranged circumferentially on the cylinder body. The heat dissipation fins arranged along the axial section can form a uniform heat dissipation area along the cylinder body's axial direction. Combined with the circumferentially uniform arrangement, this ensures a consistent heat dissipation rate at each circumferential position of the cylinder body, avoiding uneven heating caused by localized heat accumulation. Simultaneously, the evenly distributed fins guide airflow smoothly around the cylinder body, further improving thermal convection efficiency, enhancing the dual cooling effect, and ensuring stable hydraulic oil temperature within the cylinder.

[0015] As can be seen from the above technical solutions, the beneficial effects of this utility model are as follows: This solution integrates the refrigerant channel into the cylinder body and maintains a distance from the inner wall and bottom surface of the cylinder body, enabling the cooling capacity to be almost entirely applied to the hydraulic oil, significantly improving the basic cooling efficiency; the spiral-shaped refrigerant channel design, coaxial with the cylinder body, combined with the bent and fixed structure of the pipe inlet and outlet, not only expands the contact area between the refrigerant and the hydraulic oil to avoid excessively high local oil temperatures, but also improves structural stability and reduces installation difficulty; the flow valve setting allows for flexible adjustment of the refrigerant flow rate, balancing cooling efficiency and energy saving, especially when the flow valve is a solenoid valve and centered on the bottom surface of the cylinder body. When used in conjunction with a temperature sensor, the flow rate can be automatically and accurately adjusted based on real-time oil temperature to ensure that the hydraulic oil is always at a suitable operating temperature, further improving the stability of cylinder operation. The manual shut-off valve can cut off the refrigerant supply during maintenance, shutdown, or when heat dissipation is not required, preventing leakage and impurities from entering, and eliminating the need for electronic equipment standby, thus improving operational safety. The fixing clips on the inner wall of the cylinder can stably limit the refrigerant channel, preventing it from shaking and wearing or sticking to the cylinder body, which would cause heat loss, extending the service life of the channel and maintaining efficient cooling. The heat dissipation fins evenly arranged circumferentially along the axial section of the outer wall of the cylinder form a dual structure of "internal refrigerant cooling + external fin heat dissipation", which not only greatly improves the overall heat dissipation efficiency, but also slows down the rise in oil temperature when active cooling is not activated, fully ensuring the stable operation of the stretch pad cylinder under high-cycle, high-tonnage and other working conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this patent, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this patent. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the axial section of a specific embodiment of the present invention.

[0019] Figure 3 This is a top view schematic diagram of a specific embodiment of the present utility model.

[0020] Explanation of main figure symbols 1. Cylinder block, 2. Refrigerant passage, 3. Pipe inlet, 4. Pipe outlet, 5. Flow valve, 6. Temperature sensor, 7. Shut-off valve, 8. Heat sink fins, 9. Fixing clip. Detailed Implementation

[0021] To make the objectives, features, and advantages of this patent more apparent and understandable, the technical solutions of this patent will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this patent, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] like Figure 1-3 As shown, a tension pad cylinder includes a cylinder body 1. A refrigerant channel 2 is provided inside the cylinder body 1, with a certain distance between the refrigerant channel 2 and the inner wall and bottom surface of the cylinder body 1. The refrigerant channel 2 is spiral-shaped and coaxially arranged with the cylinder body 1. Multiple fixing clips 9 are provided on the inner wall of the cylinder body 1, and in a top view, the multiple fixing clips 9 are evenly arranged circumferentially on the cylinder body 1. The refrigerant channel 2 is fixedly installed inside the cylinder body 1 by the fixing clips 9. The refrigerant channel is connected to an external circulation device, such as a compressor (this is prior art for refrigerant systems and will not be described further). Furthermore, the outer wall of the cylinder body 1 is provided with heat dissipation fins 8, which are arranged along the axial section of the cylinder body 1, and the multiple heat dissipation fins 8 are evenly arranged circumferentially on the cylinder body 1.

[0023] The upper end of the refrigerant channel 2 is bent radially outward to form a pipe inlet 3, which extends out of the cylinder body 1. The lower end of the refrigerant channel 2 is bent radially outward to form a pipe outlet 4, which also extends out of the cylinder body 1. Both the pipe inlet 3 and the pipe outlet 4 are fixedly connected to the cylinder body 1. A flow valve 5, which is a solenoid valve, is connected to the pipe inlet 3. A temperature sensor 6 is also provided inside the cylinder body 1. The temperature sensor 6 is located at the center of the bottom surface of the inner cavity of the cylinder body 1 and is electrically connected to the flow valve 5. A shut-off valve 7, which is a manual valve, is connected to the pipe outlet 4.

[0024] As can be seen from the above embodiments, the advantages of this utility model are as follows: This solution integrates the refrigerant channel into the cylinder body and maintains a distance from the inner wall and bottom surface of the cylinder, ensuring that the cooling capacity is almost entirely applied to the hydraulic oil, significantly improving the basic cooling efficiency; the spiral-shaped refrigerant channel design, coaxial with the cylinder body, combined with the bent and fixed structure at the pipe inlet and outlet, not only expands the contact area between the refrigerant and the hydraulic oil to avoid excessively high local oil temperatures, but also improves structural stability and reduces installation difficulty; the flow valve allows for flexible adjustment of the refrigerant flow rate, balancing cooling efficiency and energy saving, especially when the flow valve is a solenoid valve and centered on the bottom surface of the cylinder body. When used in conjunction with a temperature sensor, the flow rate can be automatically and accurately adjusted based on real-time oil temperature to ensure that the hydraulic oil is always at a suitable operating temperature, further improving the stability of cylinder operation. The manual shut-off valve can cut off the refrigerant supply during maintenance, shutdown, or when heat dissipation is not required, preventing leakage and impurities from entering, and eliminating the need for electronic equipment standby, thus improving operational safety. The fixing clips on the inner wall of the cylinder can stably limit the refrigerant channel, preventing it from shaking and wearing or sticking to the cylinder body, which would cause heat loss, extending the service life of the channel and maintaining efficient cooling. The heat dissipation fins evenly arranged circumferentially along the axial section of the outer wall of the cylinder form a dual structure of "internal refrigerant cooling + external fin heat dissipation", which not only greatly improves the overall heat dissipation efficiency, but also slows down the rise in oil temperature when active cooling is not activated, fully ensuring the stable operation of the stretch pad cylinder under high-cycle, high-tonnage and other working conditions.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use this patent. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this patent. Therefore, this patent is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stretch pad cylinder, comprising a cylinder body (1), characterized in that, The cylinder (1) is provided with a refrigerant channel (2) inside, and the refrigerant channel (2) is spaced a certain distance from the inner wall and bottom surface of the cylinder (1).

2. The stretching pad cylinder according to claim 1, characterized in that, The refrigerant channel (2) is a cooling pipe arranged spirally around the central axis of the cylinder (1). The upper end of the refrigerant channel (2) is bent outward in the radial direction to form a pipe inlet (3). The pipe inlet (3) passes through the cylinder (1). The lower end of the refrigerant channel (2) is bent outward in the radial direction to form a pipe outlet (4). The pipe outlet (4) passes through the cylinder (1). The pipe inlet (3) and the pipe outlet (4) are both fixedly connected to the cylinder (1).

3. The stretching pad cylinder according to claim 2, characterized in that, A flow valve (5) is connected to the pipe inlet (3) and / or the pipe outlet (4).

4. The stretching pad cylinder according to claim 3, characterized in that, A shut-off valve (7) is also connected to the pipe inlet (3) and / or the pipe outlet (4), and the shut-off valve (7) is a manual valve.

5. The stretching pad cylinder according to claim 2, characterized in that, The cylinder (1) has multiple fixing clips (9) on its inner wall, and the refrigerant channel (2) is fixedly installed on the fixing clips (9).

6. The stretch pad cylinder according to claim 5, characterized in that, In a top view, multiple fixing clips (9) are evenly arranged in the circumferential direction of the cylinder body (1).

7. The stretch pad cylinder according to claim 3, characterized in that, The flow valve (5) is a solenoid valve, and a temperature sensor (6) is also provided in the cylinder body. The temperature sensor (6) is electrically connected to the flow valve (5).

8. The stretching pad cylinder according to claim 7, characterized in that, The temperature sensor (6) is located at the center of the bottom surface of the inner cavity of the cylinder (1).

9. The stretching pad cylinder according to claim 1, characterized in that, The outer wall of the cylinder (1) is provided with heat dissipation fins (8).

10. The stretch pad cylinder according to claim 9, characterized in that, The heat dissipation fins (8) are arranged along the axial section of the cylinder body (1), and a plurality of the heat dissipation fins are evenly arranged in the circumferential direction of the cylinder body (1).

Images