Hydraulic driving device and rail welding machine

Abstract

The utility model discloses a hydraulic driving device which comprises a driving cylinder body and a driving rod, a hydraulic cavity and a first flow guide hole are arranged in the driving cylinder body, and the first flow guide hole is communicated with the hydraulic cavity. A first piston is arranged in the hydraulic cavity and moves in the axial direction of the first piston when fluid is guided in or out of the hydraulic cavity so as to drive the driving rod to stretch out of or stretch into the driving cylinder body. A pressurizing cavity and a second piston are arranged in the driving rod, and the second piston is located in the pressurizing cavity and connected with the first piston; the pressurizing cavity is provided with a second flow guide hole, and the second piston applies a jacking force to the first piston after fluid is guided into the pressurizing cavity. The rail welding machine comprises a welding machine head and the hydraulic driving device. Fluid is guided in through the built-in pressurizing cavity of the driving rod, so that hydraulic pressure is increased, the clamping force of the welding machine head on a steel rail is increased, and meanwhile, the whole device is relatively small in size and convenient to install and maintain in the later period.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic drive technology, and in particular to a hydraulic drive device and a rail welding machine. Background Technology

[0002] A rail welding machine is a specialized piece of equipment used for welding steel rails. It primarily uses a specific welding process to connect the ends of two steel rails together to form a continuous track, meeting the needs of railway construction and maintenance. During the upsetting stage of welding, hydraulic drive provides the driving force for the welding head connection. The welding head then applies upsetting pressure, which causes plastic deformation of the metal ends of the weldments in a high-temperature, plastic state, allowing the metals of the two weldments to fuse tightly, thus completing the welding process.

[0003] To ensure sufficient clamping force for the welding head and guarantee the locking welding process for long rails, the internal hydraulic pressure of the hydraulic drive device is usually increased to enhance the clamping force of the welding head connected to it. Currently, the method used to increase the hydraulic pressure is usually to use an external hydraulic pump and hydraulic system to increase the hydraulic pressure, resulting in a large overall size of the hydraulic drive device, which seriously affects the portability of the equipment. In addition, the larger size means that the maintenance of the equipment is also more difficult. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a hydraulic drive device and welding equipment, which introduces fluid to increase the hydraulic pressure of the device by setting a booster chamber inside the drive rod. At the same time, it avoids the need for a large amount of extra space to install the booster device, as required by an external booster mechanism, thus reducing the size of the entire device, making it more portable and easier to maintain.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A hydraulic drive device includes: a drive cylinder and a drive rod. The drive cylinder has a hydraulic chamber and a first guide hole. The first guide hole communicates with the hydraulic chamber and is used to guide fluid into or out of the hydraulic chamber. A first piston is provided in the hydraulic chamber. The first piston is used to move along its own axis when fluid is introduced into or out of the hydraulic chamber, so as to drive the drive rod to extend out or into the drive cylinder.

[0007] The drive rod is provided with a pressure chamber and a second piston. The second piston is located in the pressure chamber and connected to the first piston. The pressure chamber has a second guide hole for introducing or exporting fluid. The second piston is used to apply a pressure to the first piston after the fluid is introduced into the pressure chamber.

[0008] Furthermore, the second piston passes through the first piston, and the second piston has a first flow channel. The first flow channel has a first inlet and a first outlet. The first inlet is formed as a second flow hole and is used to guide fluid into the flow channel.

[0009] Furthermore, the second piston has a flow guide, one end of which is connected to the pressurization chamber and the other end of which is connected to an external structure; the first flow guide channel is located inside the flow guide.

[0010] Furthermore, the drive cylinder is provided with a third guide hole, which is connected to the guide member and is used to guide fluid into or out of the first guide channel.

[0011] Furthermore, the flow guide includes a flow guide rod, and the first flow guide channel is disposed inside the flow guide rod; the drive cylinder is provided with a second flow guide channel, the second flow guide channel having a second inlet and a second outlet, the second inlet communicating with an external structure, the second flow guide channel extending into the drive cylinder, and the second outlet communicating with the first inlet.

[0012] Furthermore, the second piston includes a first end and a second end, the outer diameter of the first end is larger than the outer diameter of the second end, the outer periphery of the first end abuts against the cavity wall of the pressurization chamber, and the second end passes through the first piston.

[0013] Furthermore, a first sealing element is provided on the outer periphery of the first end, and the first sealing element seals between the first end and the cavity wall of the pressurization chamber.

[0014] Furthermore, a second sealing element is provided on the outer periphery of the second end, and the second sealing element seals between the second end and the inner wall of the pressurization chamber.

[0015] A rail welding machine includes a welding head and a hydraulic drive device, wherein the welding head is connected to the drive rod.

[0016] In summary, the hydraulic drive device and rail welding machine provided by this utility model have the following technical effects: In specific use, the welding head is connected to the drive rod, and then fluid is introduced into the pressurization chamber inside the drive rod through the second guide hole. At this time, due to the pressure of the fluid, the second piston is pushed and moves towards the hydraulic chamber, while applying pressure to the hydraulic chamber. This increases the pressure in the hydraulic chamber, making the pressure on the first piston located in the hydraulic chamber greater, and making the pressure transmitted by the first piston to the outside greater, thus increasing the hydraulic pressure of the entire device. At the same time, since the pressurization chamber is built into the drive rod, there is no need for other external equipment to pressurize, indirectly reducing the size of the entire device, making installation convenient, and subsequent maintenance easier. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] The meanings of the reference numerals in the attached figures are as follows:

[0019] 10. Drive cylinder; 11. Hydraulic chamber; 12. First piston; 13. First guide hole; 14. Second guide channel; 141. Second inlet; 142. Second outlet; 20. Drive rod; 21. Pressure chamber; 22. Second piston; 23. Guide rod; 231. First inlet; 232. First outlet; 30. Second seal. Detailed Implementation

[0020] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] Example 1,

[0024] See Figure 1 This utility model discloses a hydraulic drive device, including a drive cylinder 10 and a drive rod 20. The drive cylinder 10 has a hydraulic chamber 11 and a first guide hole 13. The first guide hole 13 is connected to the hydraulic chamber 11 and is used to guide fluid into or out of the hydraulic chamber 11. A first piston 12 is provided in the hydraulic chamber 11. When fluid is introduced into or out of the hydraulic chamber 11, the first piston 12 moves along its own axis to drive the drive rod 20 to extend or extend into the drive cylinder 10. A pressure boosting chamber 21 and a second piston 22 are provided in the drive rod 20. The second piston 22 is located in the pressure boosting chamber 21 and is connected to the first piston 12. The pressure boosting chamber 21 has a second guide hole for introducing or exporting fluid. After the second piston 22 introduces fluid into the pressure boosting chamber 21, it applies a pressure to the first piston 12.

[0025] Based on the above structure, after connecting the drive rod 20 to the first piston 12, fluid (such as hydraulic oil) is introduced into the hydraulic chamber 11 through the first guide hole 13. At this time, the fluid in the hydraulic chamber 11 brings pressure, which acts on the first piston 12, forcing the first piston 12 to move away from the hydraulic chamber 11, that is, to extend out of the drive cylinder 10 along the axial direction. At the same time, fluid (hydraulic oil) is introduced into the booster chamber 21 through the second guide hole to increase the internal pressure of the booster chamber 21. Similarly, the hydraulic pressure inside the booster chamber 21 is applied to the second piston 22, forcing the second piston 22 to move towards the hydraulic chamber 11 and transmit the pressure to the first piston 12, and through the first piston 12, the pressure is transmitted to the hydraulic chamber 11, so that the hydraulic pressure inside the hydraulic chamber 11 increases. Thus, the pressure applied to the first piston 12 becomes greater. When the drive rod 20 is subjected to a large thrust, this force will be transmitted to the welding head connected to the drive rod 20, thereby causing the welding head to generate a larger holding force.

[0026] Specifically, when this embodiment is applied to a rail welding machine or other welding equipment, during assembly, the welding head is connected to the drive rod 20, and hydraulic oil is introduced into the first guide hole 13 to increase the internal pressure of the hydraulic cylinder. This drives the drive rod 20 to extend out of the drive cylinder 10 along the axial direction, thereby driving the welding head toward the workpiece and applying pressure to it. When greater pressure is required on the workpiece, fluid is introduced into the pressurization chamber 21 inside the drive rod 20 through the second guide hole. At this time, due to the pressure of the fluid, the second piston 22 is pushed and moves toward the hydraulic chamber 11, while applying pressure to the hydraulic chamber 11 to increase the hydraulic pressure of the hydraulic chamber 11, making the thrust applied to the first piston 12 greater. In this way, the holding force of the welding head connected to the first piston 12 is increased.

[0027] It should be noted that, as Figure 1 As shown, the cross-sectional area of ​​the booster chamber 21 is smaller than that of the hydraulic chamber 11, so that the hydraulic pressure inside the hydraulic chamber 11 is greater than that in the booster chamber 21, and there is a pressure difference between the two. Thus, when fluid is introduced into the booster chamber 21, although the force generated is small, this pressure will be transmitted to the hydraulic chamber 11 in equal measure, making the pressure inside the hydraulic chamber 11 increase. At the same time, there is a pressure difference on both sides of the first piston 12, which causes the first piston 12 to move towards the direction of lower pressure (i.e., booster chamber 21), thereby pushing the drive rod 20 to move axially along the drive cylinder 10 towards the end away from the hydraulic chamber 11 and extend out of the drive cylinder 10 to drive the welding head to move.

[0028] When the welding head needs to be reset, the fluid is simply discharged from the first guide hole 13 through a structure such as a hydraulic pump. At this time, the hydraulic pressure inside the booster chamber 21 is greater than the hydraulic pressure in the hydraulic chamber 11. The hydraulic pressure in the booster chamber 21 is applied to the first piston 12 through the second piston 22, pushing the second piston 22 toward the hydraulic chamber 11, so as to drive the drive rod 20 and the welding head to move toward the hydraulic chamber 11 and reset.

[0029] More specifically, since the pressure chamber 21 is built into the drive rod 20, the internal space of the drive rod 20 is effectively utilized, avoiding the need for a large amount of additional space to accommodate the pressure boosting equipment, as required by external pressure boosting mechanisms. This compact structure is highly advantageous for welding equipment with limited space (such as mobile flash rail welding machines). For example, at railway construction sites, where equipment needs to operate beside narrow tracks, the drive rod 20 with its internally integrated pressure chamber 21 allows for a more compact layout of the entire rail welding machine, avoiding site limitations due to the large size of external pressure boosting equipment. This improves the equipment's adaptability to various complex construction environments and makes installation more convenient.

[0030] Furthermore, the larger size means that the equipment is more difficult to maintain. During routine maintenance or troubleshooting, technicians need to inspect and repair a wider area. For example, when the pressurization part has a hydraulic oil leak or other malfunction, due to its complex structure and large size, technicians need to spend more time locating the fault point. In addition, during the repair process, more parts may need to be disassembled, which increases the workload and difficulty of maintenance. Therefore, when using the hydraulic drive device in this embodiment, since there is no need for an external pressurization mechanism, the overall size of the device is relatively small, and subsequent maintenance is easier.

[0031] It should be noted that the drive rod 20 is an existing piston rod. During assembly, the drive rod 20 is connected to the first piston 12 by thread or welding. The pressure chamber 21 can be integrally formed inside the drive rod 20. The second piston 22 is inserted into the pressure chamber 21 and slides with the cavity wall of the pressure chamber 21, so that it can move along the cavity wall of the pressure chamber 21 after being pressurized.

[0032] In addition, the first guide hole 13 can be a through hole provided on the drive cylinder 10 and communicating with the hydraulic chamber 11, while the second guide hole can be a hole provided on the drive rod 20 and communicating with the booster chamber 21, or it can be a hole provided on the drive cylinder 10. When the second guide hole is provided on the drive cylinder 10, fluid can be introduced into the booster chamber 21 by passing a conduit through the second piston 22 and the second guide hole.

[0033] Furthermore, a second piston 22 is inserted into the first piston 12. The second piston 22 has a first flow channel, which has a first inlet 231 and a first outlet 232. The first inlet 231 is formed as a second flow hole and is used to guide fluid into the flow channel.

[0034] Specifically, during assembly, a guide pipe or oil inlet can be provided on the drive cylinder 10. After the second piston 22 passes through the first piston 12, the oil inlet on the drive cylinder 10 is guided into the first guide channel through the guide pipe and flows into the booster chamber 21. In this way, there is no need to provide a second guide hole on the drive rod 20, so as to avoid the phenomenon that leakage occurs or the oil cannot be accurately guided into the booster chamber 21 when the second guide hole moves with the drive rod 20 during the liquid guiding process.

[0035] More specifically, the second piston 22 has a flow guide, and the first flow guide channel is located inside the flow guide. During assembly, one end of the flow guide is connected to the pressure chamber 21, and the other end of the flow guide is connected to an external structure (such as a hydraulic pump located on the outer periphery of the drive cylinder 10) so that fluid can be introduced into or out of the pressure chamber 21 through the flow guide.

[0036] It should be noted that the guide can be a conduit or a rod with an internal cavity, with one end inserted into the second piston 22 and the other end extending out of the drive cylinder 10 and connected to the hydraulic pump.

[0037] In addition, a third guide hole is provided on the drive cylinder 10. During assembly, the third guide hole is connected to the guide member so that the fluid outside the drive cylinder 10 can be introduced into the first guide channel through the third guide hole, or the fluid inside the first guide channel can be guided out through the third guide hole.

[0038] Furthermore, the flow guide includes a flow guide rod 23, a first flow guide channel is disposed inside the flow guide rod 23, and a second flow guide channel 14 is provided on the drive cylinder 10. The second flow guide channel 14 has a second inlet 141 and a second outlet 142. The second inlet 141 is connected to the external structure, the second flow guide channel 14 extends into the drive cylinder 10, and the second outlet 142 is connected to the first inlet 231.

[0039] Specifically, by setting a second guide channel 14 on the drive cylinder 10, when the fluid enters the second guide channel 14 from the second inlet 141, since the channel extends into the drive cylinder 10, the fluid has a transition space in this process, and then flows into the booster chamber 21 through the first guide channel. This allows the fluid to enter the booster chamber 21 in an orderly manner through the second guide channel 14 and the first guide channel in a relatively stable state, which is beneficial to the stable progress of the subsequent boosting process.

[0040] More specifically, since the guide rod 23 is usually a slender rod-shaped structure, it occupies relatively little space. Especially in some compact and space-limited pressurization chamber 21 systems, it is easier to install and arrange, and will not occupy too much space around the pressurization chamber 21. This is conducive to the miniaturization and integration design of the entire system, and indirectly reduces the installation volume of the entire device.

[0041] Furthermore, the second piston 22 includes a first end and a second end. The outer diameter of the first end is larger than the outer diameter of the second end. The outer periphery of the first end abuts against the cavity wall of the pressurization chamber 21, and the second end passes through the first piston 12.

[0042] Specifically, since the outer diameter of the first end is larger than that of the second end, the contact area between the first end and the cavity wall in the pressurization chamber 21 is larger. In this way, under the action of fluid pressure, the pressure can be more evenly distributed on the contact surface of the first end. When the high-pressure fluid enters the pressurization chamber 21, the larger outer diameter of the first end can better bear and disperse the pressure, preventing piston deformation or wear caused by excessive local pressure.

[0043] In addition, the larger outer diameter of the first end allows for better contact with the cavity wall of the pressurization chamber 21, which helps to improve the sealing effect and reduce the possibility of fluid leakage.

[0044] More specifically, a first seal is provided on the outer periphery of the first end, which seals the first end between the first end and the cavity wall of the pressurization chamber 21. This effectively reduces the probability of high-pressure fluid leaking between the first end and the cavity wall of the pressurization chamber 21, ensuring that the fluid can only flow within the specified flow channel and maintaining the pressure stability of the hydraulic system.

[0045] Similarly, a second seal 30 is provided on the outer periphery of the second end, which seals the second end between the second end and the inner wall of the pressurization chamber 21. The second seal 30 fills the contact gap between the second end and the pressurization chamber 21, thereby reducing the probability that the fluid will flow to other positions from the gap between the second piston 22 and the pressurization chamber 21 after being introduced into the pressurization chamber 21, and further improving the sealing performance of the entire structure.

[0046] It should be noted that both the first seal and the second seal 30 can be made of existing materials such as rubber, polyurethane, or silicone, such as gaskets or sealing rings.

[0047] Example 2,

[0048] A rail welding machine includes a welding head and the hydraulic drive device in Embodiment 1, wherein the welding head is connected to the drive rod 20.

[0049] During specific assembly, the welding head is connected to the drive rod 20, and hydraulic oil is introduced into the hydraulic chamber 11 through the first guide hole 13 to increase the pressure inside the hydraulic chamber 11. This drives the drive rod 20 to extend out of the drive cylinder 10 along the axial direction, thereby driving the welding head toward the workpiece and applying pressure to it. When greater pressure is required on the workpiece, fluid is introduced into the pressurization chamber 21 inside the drive rod 20 through the second guide hole. At this time, due to the pressure of the fluid, the second piston 22 is pushed and moves toward the hydraulic chamber 11, while applying pressure to the hydraulic chamber 11 to increase the hydraulic pressure in the hydraulic chamber 11. This results in a greater thrust applied to the first piston 12, thereby increasing the holding force of the welding head connected to the first piston 12.

[0050] When it is necessary to adjust the hydraulic pressure, simply control the flow rate of the fluid to change the hydraulic pressure inside the booster chamber 21 or the hydraulic chamber 11 in real time.

[0051] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hydraulic drive device, characterized in that, include: The drive cylinder and drive rod are provided. The drive cylinder has a hydraulic chamber and a first guide hole. The first guide hole communicates with the hydraulic chamber and is used to guide fluid into or out of the hydraulic chamber. The hydraulic chamber is provided with a first piston, which is used to move along its own axis when fluid is introduced into or discharged from the hydraulic chamber, so as to drive the drive rod to extend out or extend into the drive cylinder. The drive rod is provided with a pressure chamber and a second piston. The second piston is located in the pressure chamber and connected to the first piston. The pressure chamber has a second guide hole for introducing or exporting fluid. The second piston is used to apply a pressure to the first piston after the fluid is introduced into the pressure chamber.

2. The hydraulic drive device as described in claim 1, characterized in that, The second piston is inserted inside the first piston. The second piston has a first flow channel. The first flow channel has a first inlet and a first outlet. The first inlet is formed as a second flow hole and is used to guide fluid into the flow channel.

3. The hydraulic drive device as described in claim 2, characterized in that, The second piston has a flow guide, one end of which is connected to the pressurization chamber and the other end of which is connected to an external structure; the first flow guide channel is located inside the flow guide.

4. The hydraulic drive device as described in claim 3, characterized in that, The drive cylinder is provided with a third guide hole, which is connected to the guide member and is used to guide fluid into or out of the first guide channel.

5. The hydraulic drive device as described in claim 4, characterized in that, The flow guide includes a flow guide rod, and the first flow guide channel is disposed inside the flow guide rod; the drive cylinder is provided with a second flow guide channel, the second flow guide channel has a second inlet and a second outlet, the second inlet is connected to an external structure, the second flow guide channel extends into the drive cylinder, and the second outlet is connected to the first inlet.

6. The hydraulic drive device according to any one of claims 1-5, characterized in that, The second piston includes a first end and a second end. The outer diameter of the first end is larger than the outer diameter of the second end. The outer periphery of the first end abuts against the cavity wall of the pressurization chamber, and the second end passes through the first piston.

7. The hydraulic drive device as described in claim 6, characterized in that, A first sealing element is provided on the outer periphery of the first end, and the first sealing element seals between the first end and the cavity wall of the pressurization chamber.

8. The hydraulic drive device as described in claim 6, characterized in that, The outer periphery of the second end is provided with a second sealing element, which seals between the second end and the inner wall of the pressurization chamber.

9. A rail welding machine, characterized in that, It includes a welding head and a hydraulic drive device as described in any one of claims 1-8, wherein the welding head is connected to the drive rod.

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