Energy-saving silicon carbide tube bank heat exchanger

Abstract

The application discloses an energy-saving silicon carbide column-pipe heat exchanger, and belongs to the technical field of heat exchangers. The energy-saving silicon carbide column-pipe heat exchanger comprises a heat exchanger shell, a first flow-through pipe and a second flow-through pipe which are installed at the left and right ends of the heat exchanger shell, support side plates which are installed in the heat exchanger shell, heat exchange pipes which are installed between the two support side plates, and positioning pipe plates which are welded in the heat exchanger shell and through which the heat exchange pipes are installed. The heat exchange pipes are driven to rotate by fluid heat sources, and cleaning and regulating components are installed in the heat exchange pipes. The cleaning and regulating components can selectively rotate synchronously with the heat exchange pipes, so that the inner walls of the heat exchange pipes can be scraped and cleaned according to actual heat exchange conditions. The energy-saving silicon carbide column-pipe heat exchanger can selectively clean the dirt on the inner walls of the heat exchange pipes which affect the heat exchange effect, avoid meaningless scraping of the cleaning components and the inner walls of the heat exchange pipes, prolong the service life of the cleaning components, and is more energy-saving and environment-friendly.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to an energy-saving silicon carbide tube heat exchanger. Background Technology

[0002] Shell and tube heat exchangers, also known as tubular heat exchangers, are among the most widely used heat exchange equipment in industries such as chemical, petroleum, energy, and pharmaceutical. Their basic structure consists of components such as shell, tube sheet, heat exchange tubes, and end caps. They achieve process objectives such as heating, cooling, condensation, or waste heat recovery through the heat exchange between two fluids at different temperatures in the tube side and shell side.

[0003] For example, in the case of a shell-and-tube heat exchanger and a forced circulation evaporator separator, as disclosed in announcement number CN116718046B, the shell-and-tube heat exchanger includes a heat exchanger body and a cleaning assembly. The heat exchanger body includes a shell, a first tube box and a second tube box. The first tube box and the second tube box are respectively disposed at both ends of the shell. A first tube sheet is fixed between the first tube box and the shell. A second tube sheet is fixed between the second tube box and the shell. A heat-conducting tube is disposed between the first tube sheet and the second tube sheet.

[0004] The existing technology has the following technical problems: When using the heat exchanger, in order to facilitate the cleaning of dirt on the inner wall of the heat pipe, a rotatable cleaning component is installed inside the heat pipe. However, the cleaning component is driven by hydrodynamics. Therefore, regardless of whether there is dirt on the inner wall of the heat pipe that affects the heat exchange effect, as long as there is fluid flowing inside the heat pipe, the cleaning component will rub against the inner wall of the heat pipe. Over time, this will cause the cleaning component to scrape against the inner wall of the heat pipe during actual working processes when cleaning is not required, which will easily reduce the service life of the cleaning component itself.

[0005] Therefore, we propose an energy-saving silicon carbide tube heat exchanger to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving silicon carbide tube heat exchanger to solve the problem mentioned in the background art. In existing heat exchangers on the market, to facilitate cleaning of the inner wall of the heat pipe, a rotatable cleaning component is installed inside the heat pipe. However, this cleaning component is driven by hydrodynamics. Therefore, regardless of whether there is dirt affecting the heat exchange effect on the inner wall of the heat pipe, as long as there is fluid flow inside the heat pipe, the cleaning component will rub against the inner wall of the heat pipe. Over time, this causes the cleaning component to scrape against the inner wall of the heat pipe during actual working processes when cleaning is not required, thus easily reducing the service life of the cleaning component itself.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving silicon carbide tube heat exchanger, comprising a heat exchanger shell and a first flow pipe and a second flow pipe installed at the left and right ends of the heat exchanger shell, the first flow pipe and the second flow pipe being used for the inflow of heat source and the discharge of heat source after heat exchange, respectively; a supporting side plate is installed inside the heat exchanger shell, and a heat exchange tube is installed between the two supporting side plates; the heat exchange tube is installed through and welded to a positioning tube plate inside the heat exchanger shell; a cold source inlet and a cold source outlet are respectively installed on the upper and lower sides of the middle part of the heat exchanger shell, the cold source inlet and the cold source outlet being used for the inflow of cold source and the discharge of cold source after heat exchange, respectively; the heat exchange tube is driven to rotate by the fluid heat source, and a cleaning and control component is installed in the heat exchange tube; the cleaning and control component can selectively rotate synchronously with the heat exchange tube to facilitate scraping and cleaning of the inner wall of the heat exchange tube according to the actual heat exchange conditions.

[0008] Preferably, multiple heat exchange tubes are evenly distributed between the two supporting side plates, and each heat exchange tube has an open structure at both ends.

[0009] By adopting the above technical solution, the heat source can flow easily through the open structure at both ends of the heat exchange tube, and the flowing heat source can fully exchange heat with the cold source inside the heat exchanger shell.

[0010] Preferably, the heat exchange tube includes a limiting tube fixed to the support side plate, and a movable tube is installed between the two limiting tubes. A power impeller is provided on the side of the movable tube near the second flow tube, and a central guide rod is fixed in the middle of the power impeller. The central guide rod extends into the interior of both the limiting tube and the movable tube.

[0011] By adopting the above technical solution, when the heat source enters from one end of the active tube and exits from the other end, the fluid heat source can impact the power impeller, causing the power impeller to rotate.

[0012] Preferably, the central guide rod in the middle of the power impeller is rotatably connected to the limiting tube, and the central guide rod is fixedly connected to the movable tube. The movable tube can rotate between the two movable tubes, and a high-temperature resistant seal is provided at the connection between the movable tube and the limiting tube.

[0013] By adopting the above technical solution, the sealing of the connection between the moving tube and the limiting tube can be guaranteed by the setting of the sealing element, preventing the heat source from flowing out from the gap between the moving tube and the limiting tube. At the same time, the rotation of the power impeller can drive the central guide rod and the moving tube to rotate synchronously.

[0014] Preferably, the cleaning control component includes a plug-in crossbar inserted inside the limiting tube and the movable tube, and a guide groove is provided on the plug-in crossbar. Cleaning scrapers are provided on the upper and lower sides of the plug-in crossbar, and the abutting blocks fixed on the cleaning scrapers are inserted into the guide grooves provided on the plug-in crossbar. The plug-in crossbar is installed through the lifting plate, and a limiting magnetic block is fixed at the end of the plug-in crossbar. A partition plate is fixed on the left side inside the heat exchanger shell, and an isolation cavity is formed between the partition plate and the left side inside the heat exchanger shell. A solenoid block is fixed in the isolation cavity on the side of the limiting magnetic block, and the middle part of the lifting plate is installed on the telescopic end of the power cylinder.

[0015] By adopting the above technical solution, the heat source entering the heat exchanger shell can be isolated by the partition plate, thus preventing the heat source from coming into contact with the electromagnetic block and the limiting magnetic block.

[0016] Preferably, the left and right ends of the cleaning scraper abut against the inner ends of the movable tube, and the cleaning scraper is initially in contact with the inner wall of the movable tube.

[0017] By adopting the above technical solution, the cleaning scraper can be prevented from moving horizontally by abutting against the two ends of the left and right sides of the cleaning scraper and the two ends of the inner side of the moving tube. At the same time, the cleaning scraper is in close contact with the inner wall of the moving tube, so that the dirt attached to the inner wall of the moving tube can be scraped off when the moving tube rotates.

[0018] Preferably, the outer wall of the contact block away from the cleaning scraper and the inner wall of the guide groove opened on the plug-in crossbar are in contact with each other, and the plug-in crossbar can rotate on the lifting plate.

[0019] By adopting the above technical solution, when the connecting crossbar rotates on the lifting plate, the rotation of the connecting crossbar can drive the cleaning scraper to rotate synchronously through the contact pressure block.

[0020] Preferably, the limiting magnetic block and the electromagnetic block at the end of the plug-in crossbar are arranged in parallel, and the electromagnetic block can generate a magnetic attraction force on the attached limiting magnetic block after being energized.

[0021] By adopting the above technical solution, the stability of the insertion crossbar can be ensured by the attraction of the limiting magnetic block by the electromagnetic block, thus preventing the insertion crossbar from rotating synchronously with the movable tube.

[0022] Preferably, the end of the insert crossbar away from the limiting magnetic block can be pressed against the central guide rod, and the contact surfaces of both the central guide rod and the insert crossbar are set as rough surfaces.

[0023] By adopting the above technical solution, the movement of the plug-in crossbar can press against the end of the central guide rod, and the rough surfaces of the central guide rod and the plug-in crossbar can be used to improve the contact friction between the two.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the energy-saving silicon carbide tube heat exchanger can selectively clean the inner wall of the heat exchange tubes based on whether there is dirt on the inner wall that affects the heat exchange effect, avoiding meaningless scraping between the cleaning components and the inner wall of the heat exchange tubes, improving the service life of the cleaning components, and being more energy-saving and environmentally friendly; 1. By using a power impeller to drive the movable tube to rotate under the impact of fluid, the need for external electrical equipment can be eliminated, making the entire device more energy-efficient. At the same time, when the movable tube rotates, the dirt attached to the inner wall of the movable tube can be cleaned by the scraping between the inner wall and the cleaning scraper. When the end of the plug-in crossbar is pressed with the central guide rod, the central guide rod will drive the cleaning scraper to rotate synchronously with the movable tube, so that the movable tube and the cleaning scraper are in a relatively stationary state, so that there is no relative friction between the two, and the wear of the cleaning scraper is minimized. 2. The heat-conducting element on the movable tube can increase the contact area between the movable tube and the cold source inside the heat exchanger shell, thereby improving the overall heat exchange effect. At the same time, when the movable tube rotates, it can drive the heat-conducting element to rotate synchronously. The rotation of the heat-conducting element can agitate the cold source inside the heat exchanger shell, improve the flow of the cold source inside the heat exchanger shell, and further improve the heat exchange efficiency. Attached Figure Description

[0025] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a schematic diagram of the heat exchanger shell and power cylinder structure of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the supporting side plate and heat exchange tube structure of the present invention; Figure 5 This is a schematic diagram of the active tube and power impeller structure of the present invention; Figure 6 This is a schematic diagram of the insertion crossbar and limiting magnetic block structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 9 This is a schematic diagram of the active tube and heat-conducting component structure of the present invention.

[0026] In the diagram: 1. Heat exchanger shell; 2. First flow pipe; 3. Second flow pipe; 4. Support side plate; 5. Heat exchange tube; 501. Limiting pipe; 502. Movable pipe; 503. Power impeller; 504. Central guide rod; 6. Positioning tube sheet; 7. Heat-conducting component; 8. Cold source inlet; 9. Cold source outlet; 10. Cleaning and control components; 101. Insertion crossbar; 102. Guide groove; 103. Cleaning scraper; 104. Pressing block; 105. Lifting plate; 106. Limiting magnetic block; 107. Electromagnetic block; 108. Partition plate; 109. Power cylinder. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-9In existing heat exchangers, a rotatable cleaning element is installed inside the heat pipe for easy cleaning of the inner wall of the heat pipe. However, this cleaning element is driven by hydrodynamics. Therefore, regardless of whether there is dirt affecting the heat exchange effect on the inner wall of the heat pipe, as long as there is fluid flow inside the heat pipe, the cleaning element will rub against the inner wall of the heat pipe. Over time, this will cause the cleaning element to scrape against the inner wall of the heat pipe during actual working processes when cleaning is not required, thus easily reducing the service life of the cleaning element itself. To solve this technical problem, this embodiment discloses the following technical content: an energy-saving silicon carbide tube heat exchanger, including a heat exchanger shell 1 and a first flow pipe 2 and a second flow pipe 3 installed at the left and right ends of the heat exchanger shell 1. The first flow pipe 2 and the second flow pipe 3 are used for the inflow of heat source and the discharge of heat source after heat exchange, respectively. A support side plate 4 is installed inside the heat exchanger shell 1. A heat exchange tube 5 is installed between the two support side plates 4. The heat exchange tube 5 is installed through and welded to a positioning tube plate 6 inside the heat exchanger shell 1. A cold source inlet 8 and a cold source outlet 9 are installed on the upper and lower sides of the middle of the heat exchanger shell 1, respectively. The cold source inlet 8 and the cold source outlet 9 are used for the inflow of cold source and the discharge of cold source after heat exchange, respectively. The heat exchange tube 5 is driven to rotate by the fluid heat source, and a cleaning and control component 10 is installed in the heat exchange tube 5. The cleaning and control component 10 can selectively rotate synchronously with the heat exchange tube 5 to facilitate scraping and cleaning of the inner wall of the heat exchange tube 5 according to the actual heat exchange conditions. The heat exchange tube 5 is located between the two support side plates 4. Multiple heat exchange tubes 5 are evenly distributed, and each heat exchange tube 5 has an open structure at both ends. Each heat exchange tube 5 includes a limiting tube 501 fixed to the supporting side plate 4, and a movable tube 502 is installed between two limiting tubes 501. A power impeller 503 is provided on the side of the movable tube 502 closest to the second flow pipe 3, and a central guide rod 504 is fixed in the middle of the power impeller 503. The central guide rod 504 extends into both the limiting tube 501 and the movable tube 502. The central guide rod 504 in the middle of the power impeller 503 is rotatably connected to the limiting tube 501, and is fixedly connected to the movable tube 502. The movable tube 502 can rotate between the two movable tubes 502, and the connection between the movable tube 502 and the limiting tube 501 is provided with... Equipped with high-temperature resistant seals, the cleaning and control component 10 includes a plug-in crossbar 101 inserted into the limiting tube 501 and the movable tube 502, with a guide groove 102 on the plug-in crossbar 101. Cleaning scrapers 103 are provided on the upper and lower sides of the plug-in crossbar 101, and the abutment blocks 104 fixed on the cleaning scrapers 103 are inserted into the guide grooves 102 on the plug-in crossbar 101. The plug-in crossbar 101 is installed through the support plate 105, and a limiting magnetic block 106 is fixed at the end of the plug-in crossbar 101. A partition plate 108 is fixed on the left side inside the heat exchanger shell 1, and the partition plate 108 and the left side inside the heat exchanger shell 1 form an isolation cavity. A solenoid block 107 fixed in the isolation cavity is provided on the side of the limiting magnetic block 106.The lifting plate 105 is mounted on the telescopic end of the power cylinder 109 at its center. The left and right ends of the cleaning scraper 103 abut against the inner ends of the movable tube 502. Initially, the cleaning scraper 103 is in contact with the inner wall of the movable tube 502. The outer wall of the contact block 104 away from the cleaning scraper 103 and the inner wall of the guide groove 102 on the insert crossbar 101 are in contact with each other. The insert crossbar 101 can rotate on the lifting plate 105. The limiting magnetic block 106 and the solenoid block 107 at the end of the insert crossbar 101 are arranged in parallel. When the solenoid block 107 is energized, it can generate a magnetic attraction force on the contacting limiting magnetic block 106. The end of the insert crossbar 101 away from the limiting magnetic block 106 can be pressed tightly against the central guide rod 504. Both the contact surfaces of the central guide rod 504 and the insert crossbar 101 are roughened.

[0029] When heat exchange is required, the cold source fluid to be exchanged is transported to the interior of the heat exchanger shell 1 through the cold source inlet 8. Then, the heat source is transported to the interior of the heat exchanger shell 1 through the first flow pipe 2. The heat source enters the interior of the limiting pipe 501 and the movable pipe 502, where it exchanges heat with the external cold source. The heat source after heat exchange is finally discharged outwards through the second flow pipe 3. This cycle repeats continuously. When the movable pipe 502 accumulates a lot of dirt on its inner wall after prolonged use, affecting the heat exchange effect, the power cylinder 109 pulls the lifting plate 105 towards the outside of the heat exchanger shell 1. After the lifting plate 105 moves, it can drive the insertion crossbar 101 to move synchronously. At this time, the end of the insertion crossbar 101 disengages from the end of the central guide rod 504, and the insertion crossbar... The limiting magnetic block 106 and the solenoid block 107 at the rear end of the moving rod 101 are in contact with each other. The magnetic force of the solenoid block 107 after being energized can attract the limiting magnetic block 106, thereby ensuring the stability of the inserted crossbar 101. As the heat source flows out of the moving tube 502 and the limiting tube 501, the fluid heat source can impact the power impeller 503. At this time, the power impeller 503 drives the central guide rod 504 to rotate synchronously. The central guide rod 504 is fixedly connected to the moving tube 502. Therefore, the rotation of the central guide rod 504 can make the moving tube 502 rotate synchronously. Since the inner wall of the moving tube 502 and the cleaning scraper 103 are in contact with each other, the dirt attached to the inner wall of the moving tube 502 can be evenly scraped off by the cleaning scraper 103 when the moving tube 502 rotates. When cleaning of the inner wall of the movable tube 502 is not required, the solenoid block 107 is de-energized. After the solenoid block 107 is de-energized, it releases the magnetic attraction to the limiting magnetic block 106. Then, the power cylinder 109 pushes the lifting plate 105 to move away from the solenoid block 107. After the lifting plate 105 moves, it can drive the insertion crossbar 101 to move synchronously. At this time, the end of the insertion crossbar 101 is pressed against the end of the central guide rod 504. Afterwards, when the power impeller 503 and the central guide rod 504 rotate, the central guide rod 504 is already pressed against the insertion crossbar. When the ends of 101 are pressed together, and the contact surfaces of the two are rough, the central guide rod 504 will drive the pressed plug-in crossbar 101 to rotate synchronously. After the plug-in crossbar 101 rotates, it can drive the cleaning scraper 103 to rotate synchronously through the abutting block 104. Therefore, the cleaning scraper 103 will rotate synchronously with the movable tube 502. The two are in a relatively stationary state, and there will be no friction between the cleaning scraper 103 and the movable tube 502, thereby minimizing the wear of the cleaning scraper 103 and improving the service life of the cleaning scraper 103. Because the contact block 104 on the cleaning scraper 103 can slide on the connecting crossbar 101, and the two ends of the cleaning scraper 103 are in contact with the inner sides of the movable tube 502, the connecting crossbar 101 will not drive the cleaning scraper 103 to move synchronously when it moves.

[0030] Example 2: The technical content disclosed in this example is a further improvement based on Example 1 above. In order to improve the heat exchange efficiency of the required heat exchange liquid, such as... Figure 4 and Figure 9 As shown, the following technical content is disclosed in this embodiment: a heat-conducting component 7 is installed on the active tube 502, and the surface of the heat-conducting component 7 is set with a concave-convex structure.

[0031] During the heat exchange process, the rotation of the movable tube 502 drives the heat-conducting element 7 on it to rotate synchronously. The rotation of the heat-conducting element 7 can agitate the cold source to be exchanged inside the heat exchanger shell 1, thereby improving the fluidity of the cold source inside the heat exchanger shell 1 and improving the heat exchange efficiency of the cold source. At the same time, the movable tube 502 and the heat-conducting element 7 are fixedly connected, and the heat of the movable tube 502 can also be transferred to the heat-conducting element 7. The heat-conducting element 7 can also increase the contact area between the movable tube 502 and the cold source, further improving the overall heat exchange efficiency.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving silicon carbide tube heat exchanger, comprising a heat exchanger shell (1) and a first flow pipe (2) and a second flow pipe (3) installed at the left and right ends of the heat exchanger shell (1), wherein the first flow pipe (2) and the second flow pipe (3) are respectively used for the inflow of heat source and the discharge of heat source after heat exchange, wherein a supporting side plate (4) is installed inside the heat exchanger shell (1), and a heat exchange tube (5) is installed between the two supporting side plates (4), wherein the heat exchange tube (5) is installed through and mounted on a positioning tube plate (6) welded inside the heat exchanger shell (1), wherein a cold source inlet (8) and a cold source outlet (9) are respectively installed on the upper and lower sides of the middle part of the heat exchanger shell (1), wherein the cold source inlet (8) and the cold source outlet (9) are respectively used for the inflow of cold source and the discharge of cold source after heat exchange, characterized in that: The heat exchange tube (5) is driven to rotate by the fluid heat source, and a cleaning and control component (10) is installed in the heat exchange tube (5). The cleaning and control component (10) can selectively rotate synchronously with the heat exchange tube (5) so as to scrape and clean the inner wall of the heat exchange tube (5) according to the actual heat exchange conditions.

2. The energy-saving silicon carbide tube heat exchanger according to claim 1, characterized in that: The heat exchange tubes (5) are evenly distributed between the two supporting side plates (4), and each heat exchange tube (5) has an open structure at both ends.

3. The energy-saving silicon carbide tube heat exchanger according to claim 2, characterized in that: The heat exchange tube (5) includes a limiting tube (501) fixed on the support side plate (4), and a movable tube (502) is installed between the two limiting tubes (501). A power impeller (503) is provided on the side of the movable tube (502) near the second flow tube (3), and a central guide rod (504) is fixed in the middle of the power impeller (503). The central guide rod (504) extends into the interior of both the limiting tube (501) and the movable tube (502).

4. The energy-saving silicon carbide tube heat exchanger according to claim 3, characterized in that: The central guide rod (504) in the middle of the power impeller (503) is rotatably connected to the limiting tube (501), and the central guide rod (504) is fixedly connected to the movable tube (502). The movable tube (502) can rotate between the two movable tubes (502), and a high-temperature resistant seal is provided at the connection between the movable tube (502) and the limiting tube (501).

5. An energy-saving silicon carbide tube heat exchanger according to claim 4, characterized in that: The cleaning control component (10) includes a connecting crossbar (101) inserted into the limiting tube (501) and the movable tube (502), and a guide groove (102) is provided on the connecting crossbar (101). Cleaning scrapers (103) are provided on the upper and lower sides of the connecting crossbar (101), and the abutting blocks (104) fixed on the cleaning scrapers (103) are inserted into the guide groove (102) on the connecting crossbar (101). The connecting crossbar (101) is installed through the lifting plate (105), and the connecting crossbar (101) is installed through the lifting plate (105). 1) A limiting magnetic block (106) is fixed at the end of the heat exchanger shell (1). A partition plate (108) is fixed on the left side inside the heat exchanger shell (1). The partition plate (108) and the left side inside the heat exchanger shell (1) form an isolation cavity. A solenoid block (107) is fixed in the isolation cavity on the side of the limiting magnetic block (106). The middle part of the lifting plate (105) is installed on the telescopic end of the power cylinder (109). A heat-conducting component (7) is installed on the movable tube (502). The surface of the heat-conducting component (7) is set as a concave-convex structure.

6. An energy-saving silicon carbide tube heat exchanger according to claim 5, characterized in that: The left and right ends of the cleaning scraper (103) abut against the inner ends of the movable tube (502), and the cleaning scraper (103) is initially in contact with the inner wall of the movable tube (502).

7. An energy-saving silicon carbide tube heat exchanger according to claim 6, characterized in that: The outer wall of the contact block (104) away from the cleaning scraper (103) and the inner wall of the guide groove (102) opened on the plug-in crossbar (101) fit together, and the plug-in crossbar (101) can rotate on the lifting plate (105).

8. An energy-saving silicon carbide tube heat exchanger according to claim 7, characterized in that: The limiting magnetic block (106) and the electromagnetic block (107) at the end of the plug-in crossbar (101) are arranged in parallel, and the electromagnetic block (107) can generate a magnetic attraction force on the attached limiting magnetic block (106) after being energized.

9. An energy-saving silicon carbide tube heat exchanger according to claim 8, characterized in that: The end of the plug-in crossbar (101) away from the limiting magnetic block (106) can be pressed against the central guide rod (504), and the contact surfaces of the central guide rod (504) and the plug-in crossbar (101) are both set as rough surfaces.

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