Power plant DCS host convenient to maintain and working method thereof

Abstract

The invention belongs to the technical field of DCS hosts, and discloses a power plant DCS host convenient to maintain and a working method thereof, the power plant DCS host comprises a cabinet, the cabinet is internally provided with a computer host, a monitoring display and a plurality of mounting boxes, and the mounting boxes are uniformly arranged; sliding blocks are fixedly connected to the two sides of the mounting box, the two sliding blocks are slidably mounted on the inner wall of the cabinet, and a storage assembly is arranged in the mounting box. When the I / O module or the controller is installed, the I / O module or the controller is firstly placed in the installation box, then the connecting wire is installed on the outer wall of the winding roller in the containing groove, then the two ends of the connecting wire are connected with the machine cabinet and the controller respectively, and finally the installation box is pushed into the machine cabinet to complete installation. And during maintenance, the mounting box can directly slide out, the controller in the mounting box is moved out of the device, and then the connecting wire is taken down from the controller, so that the controller is maintained, the dismounting steps of the controller are simplified, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of DCS host computers, and in particular relates to a power plant DCS host computer which is easy to maintain and a working method thereof. Background Art

[0002] In modern power plants, the DCS host, as the core control equipment, undertakes key tasks such as data acquisition, processing, logical operations, and issuing control instructions, playing a vital role in the safe, stable, and efficient operation of the power plant. With the rapid development of the power industry and the continuous expansion of power plant scale, the performance and reliability requirements of the DCS host are increasing. At the same time, its maintenance convenience has also become one of the important indicators to measure the quality of the DCS system.

[0003] After searching, patent CN214751385U discloses a high-performance semi-physical DCS device, including a semi-physical DCS cabinet. A computer host is placed inside the semi-physical DCS cabinet, and the computer host is connected to a high-speed DCS board. The high-speed DCS board is connected via a high-speed DCS board backplane. The computer host is connected to a monitoring display. This utility model can achieve direct interaction between the virtual DCS and the process system hardware while resolving the drawbacks of the above-mentioned existing DCS-related devices.

[0004] Existing DCS host I / O modules and controllers are typically fixed-mounted. Replacement requires power outage and the removal of multiple connected components, resulting in lengthy maintenance. This not only increases operational complexity and time, but also impacts the normal operation and efficiency of the entire system. Summary of the Invention

[0005] The object of the present invention is to provide a power plant DCS host computer that is easy to maintain and a working method thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a power plant DCS host that is easy to maintain, comprising a cabinet, wherein a computer host, a monitoring display and an installation box are installed inside the cabinet, and a plurality of the installation boxes are evenly arranged;

[0007] Both sides of the installation box are fixedly connected with sliders, and the two sliders are slidably installed on the inner wall of the cabinet. The interior of the installation box is provided with a storage component.

[0008] As a further technical solution of the present invention, the storage assembly includes a storage slot opened inside the installation box, a winding roller is rotatably installed inside the storage slot, and a coil spring is installed on the outer wall of the winding roller.

[0009] As a further technical solution of the present invention, a first ratchet gear is fixedly installed on the outer wall of the winding roller, a ratchet rod is provided at the top of the first ratchet gear, a connecting block is installed at one end of the ratchet rod, and both ends of the connecting block are fixedly connected to a rotating shaft, and a torsion spring is installed on the outer wall of one of the rotating shafts.

[0010] As a further technical solution of the present invention, a limiting plate is provided on the outer wall of the ratchet rod, a first connecting shaft is fixedly connected to one side of the limiting plate, a first guide plate is provided at one end of the first connecting shaft, and the first guide plate is fixedly installed on the inner wall of the cabinet.

[0011] As a further technical solution of the present invention, a connecting plate is fixedly connected to one side of the connecting block close to the ratchet rod, and the connecting plate is slidably mounted on the inner wall of the ratchet rod.

[0012] As a further technical solution of the present invention, a second ratchet gear is provided on one side of the first ratchet gear, and the second ratchet gear is rotatably mounted on the outer wall of the winding roller.

[0013] As a further technical solution of the present invention, a first spring is installed on the outer wall of the first connecting shaft.

[0014] As a further technical solution of the present invention, two pressure plates are installed inside the winding roller, and the pressure plates are symmetrically arranged. The inner walls of the two pressure plates are evenly provided with grooves, and the inner walls of the grooves are slidably installed with protrusions, and the protrusions are fixedly installed on the outer wall of the second connecting shaft, and the second connecting shaft is slidably installed inside the winding roller. A second guide plate is provided on one side of the end of the second connecting shaft, and the second guide plate is fixedly installed on the inner wall of the cabinet.

[0015] As a further technical solution of the present invention, a second spring is installed on the outer wall of the second connecting shaft.

[0016] A maintenance-friendly operating method for a power plant DCS host comprises the following steps:

[0017] S1: When installing the controller, first place it in the installation box, then install the connecting cable to the outer wall of the winding roller in the storage slot, and then connect the two ends of the connecting cable to the cabinet and the controller respectively. Finally, push the installation box into the cabinet to complete the installation;

[0018] S2: During maintenance, the installation box can be slid out directly. The movement of the installation box drives the movement of the winding roller. At the same time, the winding roller rotates under the tension of the connecting line. The rotation of the winding roller drives the rotation of the first ratchet gear. The elastic potential energy of the torsion spring causes the ratchet rod to have a tendency to move toward the side of the first ratchet gear in real time, thereby limiting its position. When the installation box is moved outward, the winding roller does not reverse and the connecting line is not wound, thereby reducing the pressure on the connecting line.

[0019] S3: After the installation box is slid out of the cabinet, remove the connection cable from the controller to maintain the controller;

[0020] S4: When the controller is replaced or maintained and the installation box is pushed into the cabinet, the movement of the installation box drives the movement of the first connecting shaft. When the first connecting shaft contacts the first guide plate, it is forced to slide into the installation box. At the same time, the movement of the first connecting shaft drives the movement of the limit plate. The movement of the limit plate drives the movement of the ratchet rod, so that the ratchet rod moves away from the top of the first ratchet gear and is separated from it. At this time, the elastic potential energy of the coil spring can be released to drive the winding roller to reel the connecting cable in real time;

[0021] S5: When the installation box is about to slide to the bottom of the cabinet, the first connecting shaft separates from the first guide plate, and the first spring releases its elastic potential energy to reset, thereby causing the ratchet rod to move to the top of the first ratchet gear to limit it, and the winding roller no longer rewinds the connecting cable;

[0022] S6: At the same time, when the end of the second connecting shaft contacts the inclined surface of the second guide plate, it slides into the installation box through its guidance. At the same time, the movement of the second connecting shaft drives the movement of the protrusion, causing the protrusion to slide into the groove, thereby allowing the pressure plate to retract into the winding roller, loosening the connecting wire, so that after the installation box is completely slid into the cabinet, the tension of the connecting wire is reduced.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention is installed inside the cabinet by sliding the installation box. When installing the I / O module or controller, first put it into the installation box, then install the connecting wire to the outer wall of the winding roller in the storage slot, and then connect the two ends of the connecting wire to the cabinet and the controller respectively. Finally, push the installation box into the cabinet to complete the installation. During maintenance, the installation box can be slid out directly to move the internal controller out of the device, and then remove the connecting wire from the controller to maintain the controller, which simplifies the disassembly steps of the controller and improves maintenance efficiency.

[0025] 2. The present invention is provided with a storage component. During installation, the connecting wire is installed on the outer wall of the winding roller. The elastic potential energy of the coil spring causes the winding roller to reel in the connecting wire, thereby avoiding redundancy or entanglement of the connecting wire. When the controller needs to be replaced or maintained, the connecting wire can be quickly released or retracted, reducing the time for disassembly and rewiring, thereby improving maintenance efficiency.

[0026] 3. The present invention limits the first ratchet gear by the ratchet rod. When the controller needs to be replaced or maintained, the installation box is slid outward. The movement of the installation box drives the movement of the winding roller. At the same time, the winding roller is rotated under the tension of the connecting line. The rotation of the winding roller drives the rotation of the first ratchet gear, and the elastic potential energy of the torsion spring makes the ratchet rod have a real-time tendency to move toward the side of the first ratchet gear to limit it, so that the winding roller does not reverse when the installation box moves outward, and the connecting line is not wound, thereby reducing the pressure on the connecting line. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0029] Figure 3 This is a schematic cross-sectional view of the structure of the installation box of the present invention;

[0030] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at center A;

[0031] Figure 5 This is a structural schematic diagram of the first ratchet gear and the second ratchet gear of the present invention;

[0032] Figure 6 This is a schematic structural diagram of the spinous rod of the present invention;

[0033] Figure 7 It is a schematic cross-sectional view of the structure of the winding roller of the present invention.

[0034] In the figure: 1. Cabinet; 2. Computer mainframe; 3. Monitor; 4. Mounting box; 5. Slider; 6. Winding roller; 7. Coil spring; 8. First ratchet gear; 9. Ratchet rod; 10. Connecting plate; 11. Connecting block; 12. Rotating shaft; 13. Torsion spring; 14. Limiting plate; 15. First connecting shaft; 16. First guide plate; 17. First spring; 18. Second ratchet gear; 19. Second connecting shaft; 20. Second spring; 21. Bump; 22. Press plate; 23. Groove; 24. Second guide plate; 25. Storage slot. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 7As shown, in an embodiment of the present invention, a power plant DCS host that is easy to maintain includes a cabinet 1, inside which a computer host 2, a monitoring display 3 and an installation box 4 are installed, and a plurality of installation boxes 4 are evenly arranged;

[0037] Sliders 5 are fixedly connected to both sides of the installation box 4 . The two slides 5 are slidably mounted on the inner wall of the cabinet 1 . A storage component is provided inside the installation box 4 .

[0038] Existing: CN214751385U discloses a high-performance semi-physical DCS device. This patent discloses the cabinet 1, computer host 2 and monitoring display 3 proposed in this application document. This technical means will not be described in detail here;

[0039] The back panel of cabinet 1 is detachably connected to cabinet 1;

[0040] When installing an I / O module or controller, first place it in the installation box 4, then install the connecting wire to the outer wall of the winding roller 6 in the storage slot 25, then connect the two ends of the connecting wire to the cabinet 1 and the controller respectively, and finally push the installation box 4 into the cabinet 1 to complete the installation;

[0041] During maintenance, the installation box 4 can be directly slid out to move the internal controller out of the device, and then the connecting wires can be removed from the controller to perform maintenance on the controller, which simplifies the disassembly steps of the controller and improves maintenance efficiency.

[0042] like Figure 2 、 Figure 3 and Figure 4 As shown, the storage assembly includes a storage slot 25 opened inside the installation box 4, a winding roller 6 is rotatably installed inside the storage slot 25, and a coil spring 7 is installed on the outer wall of the winding roller 6.

[0043] During installation, the connecting wire is installed on the outer wall of the winding roller 6. The elastic potential energy of the coil spring 7 causes the winding roller 6 to reel in the connecting wire, thus avoiding redundancy or entanglement of the connecting wire.

[0044] When the controller needs to be replaced or maintained, the connecting wires can be quickly released or retracted, reducing the time for disassembly and rewiring, thereby improving maintenance efficiency.

[0045] like Figures 3 to 6 As shown, a first ratchet gear 8 is fixedly mounted on the outer wall of the winding roller 6, a ratchet rod 9 is provided at the top end of the first ratchet gear 8, a connecting block 11 is mounted at one end of the ratchet rod 9, and both ends of the connecting block 11 are fixedly connected to a rotating shaft 12, and a torsion spring 13 is mounted on the outer wall of one of the rotating shafts 12.

[0046] When the controller needs to be replaced or maintained, the installation box 4 is slid outward. The movement of the installation box 4 drives the movement of the winding roller 6. At the same time, the winding roller 6 rotates under the tension of the connecting line. The rotation of the winding roller 6 drives the rotation of the first ratchet gear 8, and the elastic potential energy of the torsion spring 13 makes the ratchet rod 9 have a real-time tendency to move toward the side of the first ratchet gear 8, thereby limiting it, so that the winding roller 6 does not reverse when the installation box 4 moves outward, and the connecting line is not wound, thereby reducing the pressure on the connecting line.

[0047] like Figures 2 to 5 As shown, a limit plate 14 is provided on the outer wall of the ratchet rod 9 , a first connecting shaft 15 is fixedly connected to one side of the limit plate 14 , a first guide plate 16 is provided on one end of the first connecting shaft 15 , and the first guide plate 16 is fixedly installed on the inner wall of the cabinet 1 .

[0048] Both ends of the first guide plate 16 are inclined on one side close to the first connecting shaft 15;

[0049] When the controller is replaced or maintained and the installation box 4 is pushed into the cabinet 1, the movement of the installation box 4 drives the movement of the first connecting shaft 15. The first connecting shaft 15 contacts the first guide plate 16 and slides into the installation box 4 under force. At the same time, the movement of the first connecting shaft 15 drives the movement of the limit plate 14. The movement of the limit plate 14 drives the movement of the ratchet rod 9, so that the ratchet rod 9 is moved away from the top of the first ratchet gear 8 and separated from it. At this time, the elastic potential energy of the winding spring 7 can be released to drive the winding roller 6 to reel in the connecting line.

[0050] like Figure 6 As shown, a connecting plate 10 is fixedly connected to one side of the connecting block 11 close to the ratchet rod 9 , and the connecting plate 10 is slidably mounted on the inner wall of the ratchet rod 9 .

[0051] When the limiting plate 14 pushes the ratchet rod 9, the ratchet rod 9 slides on the outer wall of the connecting plate 10 to ensure the connection between the ratchet rod 9 and the connecting block 11 before and after movement.

[0052] like Figures 2 to 6 As shown, a second ratchet gear 18 is provided on one side of the first ratchet gear 8 , and the second ratchet gear 18 is rotatably mounted on the outer wall of the winding roller 6 .

[0053] When the limiting plate 14 pushes the ratchet rod 9 away, the ratchet rod 9 is limited by the second ratchet gear 18 .

[0054] like Figure 5 As shown, a first spring 17 is installed on the outer wall of the first connecting shaft 15 .

[0055] When the first connecting shaft 15 contacts the first guide plate 16 and slides into the installation box 4 under force, the first spring 17 deforms and stores elastic potential energy. When the first connecting shaft 15 is separated from the first guide plate 16, the elastic potential energy is released by the first spring 17 and reset.

[0056] The inner wall of the mounting box 4 is provided with a first sliding groove that slides with the first guide plate 16. The first guide plate 16 is installed inside the first sliding groove. The first guide plate 16 at the bottom of the first sliding groove does not contact the first connecting shaft 15.

[0057] When the installation box 4 moves inward, the ratchet rod 9 is located at the top of the second ratchet gear 18. At this time, the winding roller 6 reels the connecting wire through the elastic potential energy of the coil spring 7. When the installation box 4 slides to the inside of the cabinet 1, the ratchet rod 9 resets and moves to the top of the first ratchet gear 8 to limit it. At this time, the winding roller 6 does not reel in the coil spring 7, thereby preventing the connecting wire from being in a reeled state and over-stretching, which helps to ensure the service life of the connecting wire.

[0058] like Figure 5 and Figure 7 As shown, two pressure plates 22 are installed inside the winding roller 6, and the pressure plates 22 are symmetrically arranged. The inner walls of the two pressure plates 22 are evenly provided with grooves 23, and the inner walls of the grooves 23 are slidably installed with protrusions 21. The protrusions 21 are fixedly installed on the outer wall of the second connecting shaft 19, and the second connecting shaft 19 is slidably installed inside the winding roller 6. A second guide plate 24 is provided on one side of the end of the second connecting shaft 19, and the second guide plate 24 is fixedly installed on the inner wall of the cabinet 1.

[0059] The side wall of the mounting box 4 is provided with a second sliding groove for sliding with the second connecting shaft 19, and the second guide plate 24 is located at the bottom of the second sliding groove;

[0060] One side of the second guide plate 24 is tilted;

[0061] When the installation box 4 slides into the cabinet 1 after maintenance, the end of the second connecting shaft 19 contacts the inclined surface of the second guide plate 24 and slides into the installation box 4 under its guidance. At the same time, the movement of the second connecting shaft 19 drives the movement of the protrusion 21, causing the protrusion 21 to slide into the groove 23, thereby allowing the pressure plate 22 to retract into the winding roller 6, loosening the connecting wire, so that the tension of the connecting wire is reduced after the installation box 4 is completely slid into the cabinet 1.

[0062] like Figure 6 As shown, a second spring 20 is installed on the outer wall of the second connecting shaft 19 .

[0063] When the installation box 4 moves outward, the movement of the installation box 4 drives the movement of the second connecting shaft 19. After the second connecting shaft 19 slides and separates from the second guide plate 24, the elastic potential energy is released by the second spring 20 to move outward. The movement of the second connecting shaft 19 drives the protrusion 21 to slide out from the inner wall of the groove 23, pushing the pressure plate 22 outward, so that the pressure plate 22 moves a distance away from the winding roller 6.

[0064] A maintenance-friendly operating method for a power plant DCS host comprises the following steps:

[0065] S1: When installing the controller, first place it in the installation box 4, then install the connecting wire to the outer wall of the winding roller 6 in the storage slot 25, and then connect the two ends of the connecting wire to the cabinet 1 and the controller respectively. Finally, push the installation box 4 into the cabinet 1 to complete the installation;

[0066] S2: During maintenance, the installation box 4 can be slid out directly. The movement of the installation box 4 drives the movement of the winding roller 6. At the same time, the winding roller 6 rotates under the tension of the connecting line. The rotation of the winding roller 6 drives the rotation of the first ratchet gear 8. The elastic potential energy of the torsion spring 13 makes the ratchet rod 9 have a tendency to move toward the side of the first ratchet gear 8 in real time, thereby limiting its position. When the installation box 4 is moved outward, the winding roller 6 does not reverse and the connecting line is not wound, thereby reducing the pressure on the connecting line.

[0067] S3: After the installation box 4 slides out of the cabinet 1, the connection cable is removed from the controller to perform maintenance on the controller.

[0068] S4: When the controller is replaced or maintained and the installation box 4 is pushed into the cabinet 1, the movement of the installation box 4 drives the movement of the first connecting shaft 15. When the first connecting shaft 15 contacts the first guide plate 16, it is forced to slide into the installation box 4. At the same time, the movement of the first connecting shaft 15 drives the movement of the limit plate 14. The movement of the limit plate 14 drives the movement of the ratchet rod 9, so that the ratchet rod 9 moves away from the top of the first ratchet gear 8 and is separated from it. At this time, the elastic potential energy of the coil spring 7 can be released to drive the winding roller 6 to reel the connecting line in real time;

[0069] S5: When the installation box 4 is about to slide to the bottom of the cabinet 1, the first connecting shaft 15 separates from the first guide plate 16, and the first spring 17 releases its elastic potential energy to reset, so that the ratchet rod 9 moves to the top of the first ratchet gear 8 to limit it, and the winding roller 6 no longer rewinds the connecting cable;

[0070] S6: At the same time, when the end of the second connecting shaft 19 contacts the inclined surface of the second guide plate 24, it slides into the installation box 4 through its guidance. At the same time, the movement of the second connecting shaft 19 drives the movement of the protrusion 21, causing the protrusion 21 to slide into the groove 23, thereby allowing the pressure plate 22 to retract into the winding roller 6, loosening the connecting wire, so that the tension of the connecting wire is reduced after the installation box 4 is completely slid into the cabinet 1.

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A power plant DCS host computer that is easy to maintain, comprising a cabinet (1), characterized in that: A computer host (2), a monitoring display (3) and an installation box (4) are installed inside the cabinet (1), and a plurality of the installation boxes (4) are evenly arranged; Both sides of the installation box (4) are fixedly connected with sliders (5), and the two sliders (5) are slidably installed on the inner wall of the cabinet (1). A storage component is provided inside the installation box (4).

2. The power plant DCS host computer that is easy to maintain according to claim 1 is characterized in that: The storage assembly comprises a storage groove (25) provided inside the installation box (4); a winding roller (6) is rotatably installed inside the storage groove (25); and a coil spring (7) is installed on the outer wall of the winding roller (6).

3. The power plant DCS host computer that is easy to maintain according to claim 2 is characterized in that: A first ratchet gear (8) is fixedly mounted on the outer wall of the winding roller (6); a ratchet rod (9) is provided at the top end of the first ratchet gear (8); a connecting block (11) is mounted on one end of the ratchet rod (9); both ends of the connecting block (11) are fixedly connected to a rotating shaft (12); a torsion spring (13) is mounted on the outer wall of one of the rotating shafts (12).

4. The power plant DCS host computer that is easy to maintain according to claim 3 is characterized by: A limit plate (14) is provided on the outer wall of the ratchet rod (9), one side of the limit plate (14) is fixedly connected to a first connecting shaft (15), one end of the first connecting shaft (15) is provided with a first guide plate (16), and the first guide plate (16) is fixedly mounted on the inner wall of the cabinet (1).

5. The power plant DCS host computer that is easy to maintain according to claim 3 is characterized by: A connecting plate (10) is fixedly connected to one side of the connecting block (11) close to the ratchet rod (9), and the connecting plate (10) is slidably mounted on the inner wall of the ratchet rod (9).

6. The power plant DCS host computer that is easy to maintain according to claim 3 is characterized by: A second ratchet gear (18) is provided on one side of the first ratchet gear (8), and the second ratchet gear (18) is rotatably mounted on the outer wall of the winding roller (6).

7. The power plant DCS host computer that is easy to maintain according to claim 4 is characterized in that: A first spring (17) is installed on the outer wall of the first connecting shaft (15).

8. The power plant DCS host computer that is easy to maintain according to claim 2 is characterized in that: Two pressure plates (22) are installed inside the winding roller (6), and the pressure plates (22) are symmetrically arranged. The inner walls of the two pressure plates (22) are evenly provided with grooves (23). The inner walls of the grooves (23) are slidably provided with protrusions (21). The protrusions (21) are fixedly installed on the outer wall of the second connecting shaft (19). The second connecting shaft (19) is slidably installed inside the winding roller (6). A second guide plate (24) is provided on one side of the end of the second connecting shaft (19), and the second guide plate (24) is fixedly installed on the inner wall of the cabinet (1).

9. The power plant DCS host computer that is easy to maintain according to claim 8 is characterized in that: A second spring (20) is installed on the outer wall of the second connecting shaft (19).

10. A method for operating a power plant DCS host that is easy to maintain, the method being applicable to the power plant DCS host that is easy to maintain as described in claims 1 to 9, characterized in that: The following steps are involved: S1: When installing the controller, first place it in the installation box (4), then install the connecting wire to the outer wall of the winding roller (6) in the storage slot (25), then connect the two ends of the connecting wire to the cabinet (1) and the controller respectively, and finally push the installation box (4) into the cabinet (1) to complete the installation; S2: During maintenance, the installation box (4) can be directly slid out, and the movement of the installation box (4) drives the movement of the winding roller (6), and at the same time, the winding roller (6) is rotated under the tension of the connecting line. The rotation of the winding roller (6) drives the rotation of the first ratchet gear (8), and the elastic potential energy of the torsion spring (13) makes the ratchet rod (9) have a tendency to move toward the side of the first ratchet gear (8) in real time, thereby limiting its position, so that when the installation box (4) moves outward, the winding roller (6) does not reverse, and the connecting line is not wound, thereby reducing the pressure on the connecting line; S3: After the installation box (4) slides out of the cabinet (1), the connection line is removed from the controller to perform maintenance on the controller; S4: When the controller is replaced or maintained and the installation box (4) is pushed into the cabinet (1), the movement of the installation box (4) drives the movement of the first connecting shaft (15). When the first connecting shaft (15) contacts the first guide plate (16), it is forced to slide into the installation box (4). At the same time, the movement of the first connecting shaft (15) drives the movement of the limit plate (14). The movement of the limit plate (14) drives the movement of the ratchet rod (9), so that the ratchet rod (9) moves away from the top of the first ratchet gear (8) and is separated from it. At this time, the elastic potential energy of the coil spring (7) can be released to drive the winding roller (6) to rewind the connecting line in real time; S5: When the installation box (4) is about to slide to the bottom of the cabinet (1), the first connecting shaft (15) is separated from the first guide plate (16), and the first spring (17) releases the elastic potential energy to reset, so that the ratchet rod (9) moves to the top of the first ratchet gear (8) to limit it, and the winding roller (6) no longer rewinds the connecting wire; S6: When the end of the second connecting shaft (19) contacts the inclined surface of the second guide plate (24), it slides into the installation box (4) through its guidance. At the same time, the movement of the second connecting shaft (19) drives the movement of the protrusion (21), causing the protrusion (21) to slide into the groove (23), thereby allowing the pressure plate (22) to retract into the winding roller (6), loosening the connecting wire, and reducing the tension of the connecting wire after the installation box (4) is completely slid into the cabinet (1).

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