Cathode linear sliding device and electrolytic polishing device equipped with the same

Abstract

The application relates to the technical field of electrolytic polishing, in particular to a cathode linear sliding device and an electrolytic polishing device provided with the same. The cathode linear sliding device comprises a sliding mechanism and a motor fixedly connected with the sliding mechanism and driving the sliding mechanism; the sliding mechanism comprises a rack, driving wheels and driven wheels fixed to two ends of the rack, a linear guide rail arranged between the driving wheels and the driven wheels, a sliding block arranged above the linear guide rail and capable of sliding on the linear guide rail, a belt arranged around the driving wheels and the driven wheels, and a belt clamping block arranged above the belt and fixedly connected with the sliding block. The device breaks through the conventional mode of dragging the cathode wire to drive the cathode to move by using a winding wire, and under the driving of the motor, the cathode wire is linearly pulled to realize the uniform polishing of the inner surface of a steel pipe under the auxiliary action of multiple components such as the linear guide rail, the sliding block, the belt clamping block and the belt.

Description

Technical Field

[0001] This invention relates to the field of electropolishing technology, and more specifically to a cathode linear sliding device and an electropolishing apparatus equipped with the device. Background Technology

[0002] Electrolytic polishing, also known as electrochemical polishing, is a method that uses the principle of electrochemical anodic corrosion to remove residual micro-imperfections on the surface, thereby reducing surface roughness and improving surface gloss. Electrolytic polishing of the inner surface of steel pipes involves using the steel pipe to be polished as the anode and a corrosion-resistant metal material as the cathode. An electrolyte is passed into the interior of the steel pipe, and under specific temperature, voltage, and current density, an electric current is applied for a certain period of time, causing the tiny protrusions on the inner surface of the steel pipe to dissolve, gradually transforming it into a smooth and shiny surface.

[0003] Chinese invention patent application number CN202210136358.1 discloses an electrolytic polishing device and method for using stainless steel inner tubes. The device can polish the inner surface of the steel tube relatively uniformly. However, using a coiled wire to pull the cathode material within the tube makes it difficult to ensure stable cathode speed. As the number of coiled wire layers increases, the radius of rotation increases. According to the formula v=2πr×n (v is linear velocity, n is rotational speed, and r is the radius of rotation), an increase in the radius of rotation increases the linear sliding speed of the cathode, ultimately resulting in good polishing quality in some areas of the steel tube, while unpolished areas remain. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art, which causes unstable cathode movement speed due to the winding method of pulling the cathode, and provides a cathode linear sliding device and an electrolytic polishing device equipped with the device to overcome the above defects.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A cathode linear sliding device includes a sliding mechanism and a motor fixedly connected to and driving the sliding mechanism; the sliding mechanism includes a frame, a driving wheel and a driven wheel fixed at both ends of the frame, a linear guide rail between the driving wheel and the driven wheel, a slider that can slide on the linear guide rail above the linear guide rail, a belt that runs around the driving wheel and the driven wheel above the linear guide rail, and a belt clamping block fixedly connected to the slider above the belt.

[0006] To ensure uniform polishing of the inner surface of the steel pipe, the anode and cathode are typically of the same length. However, when the steel pipe is long (e.g., exceeding 12 m), space constraints and ease of operation limit the cathode length to an acceptable range (e.g., 50-100 cm) in practical applications. After the cathode material is connected to the wire, the wire needs to be pulled to move the cathode inside the steel pipe. The moving speed of the cathode within the steel pipe is a crucial factor in ensuring uniform polishing of the inner surface.

[0007] The inventors of this application designed a cathode linear sliding device based on the consideration of controlling the moving speed of the cathode within a steel pipe. A motor drives a belt to rotate, which in turn drives a slider to move along a linear guide rail. The cathode wire is fixed to a belt clamping block, so as the slider moves, it drives the wire to move, causing the cathode within the steel pipe to move under the influence of the cathode wire. Most importantly, the speed provided by the motor is constant, ensuring that the initial speed will not change during long-term operation. Furthermore, the linear guide rail provides a straight running path that ensures the cathode wire's path is horizontal and straight. Since the slider and belt clamping block are fixed in one place, as the slider slides, the cathode wire fixed to the belt clamping block changes position accordingly, ensuring that the cathode wire remains taut throughout the movement and does not fold. This ensures that the cathode wire maintains horizontal linear motion and that the cathode's moving speed is always consistent with the slider's speed. The speed during operation is the initial speed provided by the motor, and there will be no speed change. Furthermore, the slider is positioned above the linear guide rail, and the belt clamping block is positioned above the belt. This creates a space between the slider and the belt clamping block, allowing the belt to pass through and restricting its operating space, thus stabilizing the relative movement of the belt within a certain range. In this way, the path of the cathode wire moving relative to the belt is also restricted, and when the path is stable, the speed during operation will not easily change. Therefore, under the action of the cathode linear sliding device proposed in this scheme, from the moment the motor provides speed until the cathode moves to the end of the steel pipe polishing process, the cathode wire is not folded, and the speed remains unchanged. A uniform speed can be maintained throughout the polishing process, resulting in uniform polishing and high polishing quality inside the steel pipe.

[0008] The length of the guide rail can be adjusted and replaced according to different steel pipe sizes, and similarly, the belt length can also be adjusted accordingly.

[0009] Preferably, the drive wheel is provided with a drive wheel shaft to help it be fixedly connected to the frame, and the drive wheel shaft is connected to the motor through a coupling.

[0010] Preferably, the belt clamping block is provided with a cathode wire connection end and a common cathode wire symmetrically arranged therewith.

[0011] The cathode wire connection end is used to connect the cathode wire, and the common end of the cathode wire is used to connect to the negative terminal of the electrolytic polishing power supply.

[0012] Preferably, the driven wheel is provided with a driven wheel axle to help fix it to the frame.

[0013] Preferably, the frame is fixed to the driving wheel / driven wheel by bolt connection.

[0014] Bolted connections facilitate disassembly and maintenance, and their positions can be quickly adjusted when the driving and driven wheels loosen over time.

[0015] Preferably, the connection between the slider and the belt clamping block is any one of bolt connection, welding, or spring connection.

[0016] When connecting the slider and the belt clamping block, any of the following methods can be selected: bolt connection, welding, or spring connection. Each of these connection methods has its own advantages and applicable situations.

[0017] Bolted connections are a common type of connection suitable for situations requiring disassembly and maintenance. By selecting appropriate bolts and nuts, a secure connection can be achieved. Bolted connections offer the advantage of easy installation and disassembly, allowing for convenient replacement of sliders or belt clamps.

[0018] Welding is a permanent connection method that achieves a connection by fusing the slider and belt clamping block. Welded connections are characterized by high strength and durability, and are suitable for situations requiring a strong connection that does not require disassembly. It is important to note that welded connections cannot be disassembled or replaced after welding.

[0019] Spring connection is a flexible connection method that uses a spring to connect the slider and the belt clamping block. Spring connection has a certain degree of elasticity, which can absorb vibration and impact, making it suitable for situations requiring a certain level of cushioning. Spring connection is easy to install and disassemble, allowing for convenient replacement of the slider or belt clamping block.

[0020] When selecting the connection method between the slider and the belt clamping block, the specific application scenario, requirements, and usage conditions need to be considered. Choosing a suitable connection method based on the connection requirements and their advantages and disadvantages can ensure the strength and reliability of the connection.

[0021] Preferably, the side of the drive wheel shaft away from the motor is connected to a keyway.

[0022] The keyway design allows the cathode linear sliding device to connect with another cathode linear sliding device to form an assembled cathode linear sliding assembly, enabling simultaneous polishing of two steel pipes, saving time and significantly improving polishing efficiency. Furthermore, the motor of the connected cathode linear sliding device can be removed and replaced with a keyway to accommodate multiple cathode linear sliding devices, retaining only the motor on the main device to drive the sequential operation of each component. Additionally, the cathode wires of multiple devices need to be connected; specifically, the common terminals of the cathode wires of each device are connected together.

[0023] Alternatively, the keyway can be integrated with the drive wheel shaft to achieve the same effect. However, for flexibility, the keyway can be rotatably connected to the drive wheel shaft, which also facilitates future maintenance and replacement.

[0024] Preferably, after rotation, the keyway can engage with another keyway to form a keyway pair that helps to connect multiple cathode linear sliding devices.

[0025] The advantage of rotating the keyway on the drive shaft is that it allows the keyways to engage with each other at any angle, forming keyway pairs to facilitate the connection of multiple cathode linear sliding devices. The shape of the keyway joint can be a toothed structure or other structures that facilitate a secure connection.

[0026] By using keyway mating, a conventional cathode linear sliding device can be transformed into an assembled cathode linear sliding assembly device for application.

[0027] An electropolishing apparatus includes the aforementioned cathode linear sliding device.

[0028] An electrolytic polishing apparatus includes a frame and a steel pipe placed on the frame, and an electrolyte tank for storing the electrolyte required for polishing the steel pipe. A cathode guide rod is provided inside the steel pipe. The aforementioned cathode linear sliding device is fixed on the frame. The cathode guide rod is connected to a belt clamping block on the cathode linear sliding device through a cathode wire.

[0029] The steel pipe is fixed above the platform, and the cathode linear sliding device is installed inside the platform (below the steel pipe). At this time, the steel pipe and the linear guide rail of the cathode linear sliding device are parallel, and sufficient electrolyte is injected into the electrolyte tank. The electrolyte is then pumped into the steel pipe.

[0030] During the polishing process, the motor rotates, driving the belt to move the slider from the rightmost end to the leftmost end of the steel pipe. The cathode wire is fixed on the belt clamping block. As the slider moves, the cathode wire is pulled, which in turn moves the cathode guide rod, which has been inserted into the steel pipe beforehand, from left to right. When the cathode guide rod moves from the leftmost end to the rightmost end of the steel pipe, one uniform polishing of the steel pipe is completed.

[0031] Preferably, the cathode rod is further provided with a limiting block.

[0032] The electrolytic polishing device proposed in this invention can be adapted to polishing of steel pipes of different sizes. Therefore, when the diameter of the cathode guide rod is too small relative to the diameter of the large-diameter steel pipe, a limiting block needs to be added to help fix the relative position of the cathode guide rod in the steel pipe, so as to prevent the cathode guide rod from sticking to one side of the steel pipe and causing the polishing quality of the other side surfaces of the steel pipe to decline.

[0033] Therefore, the present invention has the following beneficial effects: (1) The present invention provides a cathode linear sliding device, which breaks through the conventional method of using a coiled wire to drag the cathode wire to drive the cathode movement. Under the drive of the motor, the cathode wire completes the linear pulling of the cathode with the assistance of multiple components such as linear guide rail, slider, belt clamping block, and belt to achieve uniform polishing of the inner surface of the steel pipe. (2) The cathode linear sliding device provided by the present invention is provided with a keyway. The assembly of the keyway and the keyway can be used to obtain the assembled cathode linear sliding group device, which can simultaneously polish the inner surface of multiple steel pipes, saving time and greatly improving work efficiency. (3) The cathode linear sliding device provided by the present invention is suitable for polishing steel pipes of different sizes, and is not limited by the length of the steel pipe, thus having a wider range of applications; (4) The electrolytic polishing device provided by the present invention can achieve uniform polishing treatment of the inner surface of steel pipe; compared with the traditional winding method, the steel pipe inner surface electrolytic polishing cathode sliding device with modular design avoids the problems of the wire randomly winding on the spool and the stacking of wires during the traditional winding process, which increases the rotation radius of the spool and increases the linear sliding speed of the cathode, affecting the polishing quality. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the cathode linear sliding device. Figure 2 This is a schematic diagram of the assembly of the cathode linear sliding device; Figure 3 This is another assembly diagram of the cathode linear sliding device; Figure 4 This is a schematic diagram of the electropolishing apparatus. Figure 5 This is a partial structural diagram of the steel pipe and cathode conductor rod. Figure 6 for Figure 5 Another view.

[0035] The codes in the figure are as follows: sliding mechanism 100; frame 110; driving wheel 120; driving wheel shaft 121; driven wheel 130; driven wheel shaft 131; linear guide rail 140; slider 150; belt 160; belt clamping block 170; cathode wire connection end 171; cathode wire common end 172; motor 200; coupling 300; keyway 400; keyway pair 410; cathode linear sliding device 500; platform 600; electrolyte tank 610; steel pipe 620; cathode guide rod 630; limit block 631; cathode wire 640. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0037]

Example

[0038] To ensure uniform polishing of the inner surface of the steel pipe 620, the anode and cathode are typically of the same length. However, when the steel pipe 620 is long (e.g., exceeding 12 m), space constraints and ease of operation limit the cathode length to an acceptable range (e.g., 50-100 cm) in practical applications. After the cathode material is connected to the wire, the wire needs to be pulled to move the cathode within the steel pipe 620. The moving speed of the cathode within the steel pipe 620 is a crucial factor in ensuring the uniformity of the inner surface polishing.

[0039] Based on the consideration of controlling the moving speed of the cathode within the steel pipe 620, the inventors of this application designed a cathode linear sliding device 500. A motor 200 drives a belt 160 to rotate, thereby driving a slider 150 to move on a linear guide rail. The cathode wire 640 can be fixed to the belt clamping block 170. Therefore, as the slider 150 moves, it drives the wire to move, causing the cathode within the steel pipe 620 to begin moving under the influence of the cathode wire 640. Most importantly, the speed provided by the motor 200 is constant, ensuring that the initial speed will not change during long-term operation. Furthermore, the linear guide rail 140 provides a linear running channel, ensuring that the cathode wire 640's running path on the linear guide rail 140 is horizontal and straight. Since the slider 150 and the belt clamping block 170 are fixed together, as the slider 150 slides, the cathode wire 640 fixed to the belt clamping block 170 changes position accordingly, ensuring that the cathode wire 640 remains taut throughout its movement and is not folded. This ensures that the cathode wire 640 maintains horizontal linear motion and that its movement speed is always consistent with the speed of the guide rail slider 150. The speed during operation is the initial speed provided by the motor 200, preventing speed changes. Furthermore, the slider 150 is positioned above the linear guide rail, while the belt clamping block 170 is positioned above the belt 160. A space is formed between the slider 150 and the belt clamping block 170, allowing the belt 160 to pass through, thus restricting its operating space and stabilizing its relative movement within a certain range. This also restricts the path of the cathode wire 640 relative to the belt 160, preventing speed changes during operation when the path is stable. Therefore, under the action of the cathode linear sliding device 500 proposed in this solution, from the moment the motor 200 provides speed until the cathode reaches the end of polishing the steel pipe 620, the cathode wire 640 is not folded, its speed remains constant, and it maintains a uniform speed throughout the polishing process, resulting in uniform polishing and high polishing quality within the steel pipe 620.

[0040] like Figures 2-3As shown, a keyway 400 is rotatably connected to the side of the drive shaft 121 away from the motor 200. The keyway 400 allows the cathode linear sliding device 500 to engage with another cathode linear sliding device 500 to form an assembled cathode linear sliding assembly, enabling simultaneous polishing of two steel pipes 620, saving time and significantly improving polishing efficiency. Furthermore, as the cathode linear sliding device 500 is joined, the motor 200 can be removed and replaced with the keyway 400, allowing for the engagement of multiple cathode linear sliding devices 500, retaining only the motor 200 on the main assembly to drive the components in a step-by-step manner. The advantage of the keyway 400 rotatably mounted on the drive shaft 121 is that it can be rotated at any angle to engage keyways 400 to form keyway pairs, thus facilitating the engagement of multiple cathode linear sliding devices 500. The shape of the keyway 400 engagement point can be a toothed structure.

[0041] like Figures 4-6 As shown, an electrolytic polishing apparatus includes a stand 600 and a steel pipe 620 placed above the stand 600. It also includes an electrolyte tank 610 for storing the electrolyte required for polishing the steel pipe 620. A cathode guide rod 630 is installed inside the steel pipe 620. The aforementioned cathode linear sliding device 500 is fixed inside the stand 600 (below the steel pipe 620). The cathode guide rod 630 is connected to a belt clamping block 170 on the cathode linear sliding device 500 via a cathode wire 640. At this time, the steel pipe 620 is parallel to the linear guide rail 140 of the cathode linear sliding device 500, and sufficient electrolyte is injected into the electrolyte tank 610. The electrolyte is then pumped into the steel pipe 620.

[0042] The specific operation process of the electropolishing device: The steel pipe 620 is fixed above the platform 600, and the cathode linear sliding device 500 is installed inside the platform 600 (below the steel pipe 620). At this time, the steel pipe 620 and the linear guide rail 140 of the cathode linear sliding device 500 are parallel, and sufficient electrolyte is injected into the electrolyte tank 610. The electrolyte is then pumped into the steel pipe 620. During the polishing process, the motor 200 rotates, driving the belt 160 to drive the slider 150 to move from the rightmost end to the leftmost end of the steel pipe 620. The cathode wire 640 is fixed on the belt clamping block 170. As the slider 150 moves, the cathode wire 640 is pulled, thereby driving the cathode guide rod 630, which has been inserted into the steel pipe 620 beforehand, to move from left to right. When the cathode guide rod 630 moves from the leftmost end to the rightmost end of the steel pipe 620, one uniform polishing of the steel pipe 620 is completed.

[0043] [Performance Testing] To verify the actual effectiveness of the device designed in this invention, performance tests were conducted. The experiment included two groups of steel pipes, A and B. Group A was polished using the electrolytic polishing device of this invention, while group B was polished using a wire-wound device. Each group contained 6 steel pipes, each 10 meters long. Both groups of steel pipes used the same formula and batch of electrolyte, and the polishing speed was the same. After polishing, the steel pipes were cut open, and the inner surface roughness was measured using a roughness measuring instrument. Measurements were taken every 1 meter, with 11 measurements taken for each steel pipe, for a total of 12 sets of data. The test results are shown in Table 1.

[0044] Table 1 Comparison of Measurement Data from Electrolytic Polishing Control Experiment

[0045] Note: The unit in the table is Ra.

[0046] Based on the measurement results in Table 1, the variances of the two roughness groups were calculated. The variance for group A was 0.000049, and the variance for group B was 0.000191. Clearly, group A data is superior, indicating that the electropolishing device proposed in this invention significantly improves the surface quality of the electropolished inner surface.

Claims

1. A cathode linear sliding device, characterized in that, Includes a sliding mechanism and a motor that is fixedly connected to the sliding mechanism and drives the sliding mechanism; The sliding mechanism includes a frame, a drive wheel and a driven wheel fixed at both ends of the frame, a linear guide rail between the drive wheel and the driven wheel, a slider that can slide on the linear guide rail, a belt that runs around the drive wheel and the driven wheel above the linear guide rail, and a belt clamping block that is fixedly connected to the slider above the belt. The belt clamping block is provided with a cathode wire connection end and a common cathode wire end symmetrically arranged therewith. The cathode wire connection end is used to connect the cathode wire, and the common end of the cathode wire is used to connect to the negative terminal of the electrolytic polishing power supply.

2. The cathode linear sliding device according to claim 1, characterized in that, The drive wheel is provided with a drive wheel shaft for fixed connection with the frame, and the drive wheel shaft is connected to the motor through a coupling.

3. The cathode linear sliding device according to claim 1, characterized in that, The driven wheel is provided with a driven wheel axle to help fix it to the frame.

4. The cathode linear sliding device according to claim 1, characterized in that, The connection between the slider and the belt clamping block can be any one of bolt connection, welding, or spring connection.

5. A cathode linear sliding device according to any one of claims 1 to 4, characterized in that, The drive wheel shaft is connected to a keyway on the side away from the motor.

6. An electrolytic polishing apparatus, characterized in that, Includes the cathode linear sliding device as described in any one of claims 1 to 5.

7. An electrolytic polishing apparatus, comprising a frame and a steel pipe placed on the frame, and an electrolyte tank for storing the electrolyte required for polishing the steel pipe, wherein a cathode rod is provided inside the steel pipe, characterized in that, The platform is fixed with a cathode linear sliding device as described in any one of claims 1 to 5, and the cathode guide rod is connected to the belt clamping block on the cathode linear sliding device through a cathode wire.

8. The electrolytic polishing apparatus according to claim 7, characterized in that, The cathode rod is also equipped with a limiting block.

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