Port cold chain transportation system based on mechanical vision assistance

Abstract

The invention discloses a port cold chain transportation system based on mechanical vision assistance, and solves the problem that the monitoring effect is poor due to the fact that a camera is affected by the low temperature in a refrigeration house. The port cold chain transportation system comprises a refrigerated container, a container door is hinged to one end of the refrigerated container, and a vision monitoring assembly is installed on the container door; cold chain equipment is mounted in the refrigerated container, the visual monitoring assembly comprises a longitudinal through groove formed in the container door, a sealing glass plate is mounted at the end, close to the refrigerated container, of the longitudinal through groove, and a mounting frame is arranged in the longitudinal through groove and located on the side, away from the refrigerated container, of the sealing glass plate. A monitoring camera is fixedly mounted in the mounting frame; in the working process, the monitoring camera is arranged on the side, away from the refrigerated container, of the arranged sealing glass plate, so that the monitoring camera does not need to be installed in the refrigerated container for monitoring, and the situation that the monitoring camera is damaged by low temperature is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of port cold chain transportation systems, and specifically relates to a port cold chain transportation system based on machine vision assistance. Background Art

[0002] The port cold chain transportation system is an important part of the cold chain logistics system. It is mainly responsible for a series of operations such as storage, loading and unloading, and transportation of temperature-sensitive commodities at the port, a logistics transit station, to ensure the freshness and quality of commodities during transportation. The port cold chain transportation system usually includes the following components, such as cold storage for storing goods, and real-time monitoring of the temperature of commodities during storage, loading and unloading, and transportation through sensors and monitoring systems to ensure that the commodities are always within the specified temperature range. However, there are the following defects:

[0003] During cold chain transportation, monitors are required to perform mechanical vision-assisted monitoring of the interior of the cold storage. However, due to the low temperature inside the cold storage, the low temperature will affect the camera, resulting in poor monitoring results. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a port cold chain transportation system based on machine vision assistance, which effectively solves the problem that the lower temperature inside the cold storage will affect the camera, resulting in poor monitoring effect.

[0005] To achieve the above object, the present invention provides the following technical solution: a port cold chain transportation system based on machine vision assistance, comprising a refrigerated container, one end of the refrigerated container is hingedly installed with a door, the door is installed with a visual monitoring component, and the interior of the refrigerated container is installed with a cold chain device;

[0006] The visual monitoring component includes a longitudinal through groove opened inside the box door, a sealed glass plate is installed at one end of the longitudinal through groove close to the refrigerated container, a mounting frame is arranged inside the longitudinal through groove, the mounting frame is located on the side of the sealed glass plate away from the refrigerated container, a monitoring camera is fixedly installed inside the mounting frame, the sealed glass plate is used to facilitate the monitoring camera to monitor the inside of the refrigerated container, water mist removal components are symmetrically installed on the upper and lower sides of the mounting frame, and mobile power connection components are symmetrically installed on the upper and lower sides of the mounting frame.

[0007] Preferably, guide plates are symmetrically installed on both sides of the mounting frame, guide grooves are symmetrically opened on both sides of the longitudinal through groove, the guide plates are slidably installed inside the guide grooves, a longitudinal screw is rotatably installed inside one of the guide grooves, the longitudinal screw is threadedly connected to the guide plate, the top end of the longitudinal screw is fixedly connected to the output shaft of the drive motor, and the drive motor is fixedly installed on the top end of the box door.

[0008] Preferably, the water mist removal assembly includes fixed plates symmetrically installed on the upper and lower sides of the mounting frame, two rotating plates are symmetrically provided on the side where the two fixed plates are close to each other, two connecting shafts are symmetrically installed between the two rotating plates, and water absorption rollers are rotatably installed on the outer sides of the connecting shafts, one of the water absorption rollers is in contact with the surface of the sealed glass plate.

[0009] Preferably, a rotating shaft is installed on the side of the two rotating plates away from each other, and the rotating shaft is rotatably connected to the fixed plate. A driven gear is fixedly installed on one end of one of the rotating shafts, and a driving gear is meshed and connected below the driven gear. The driving gear is fixedly connected to the output shaft of the rotating motor, and the rotating motor is fixedly installed on the fixed plate.

[0010] Preferably, a heating coil is installed inside the connecting shaft, and two positioning grooves are provided on the sides of the two rotating plates away from each other. The two positioning grooves on the same side of the two rotating plates are coaxially arranged with the connecting shaft on the same side, and first contacts are installed on the inner walls of the positioning grooves, and the two first contacts are electrically connected to the heating coils.

[0011] Preferably, the mobile power connection assembly comprises a sliding frame fixedly mounted on the upper and lower sides of the mounting frame, the sliding frame is located on the side of the rotating plate away from the sealing glass plate, a sliding groove is provided inside the sliding frame, and two movable adjustment members are slidably mounted inside the sliding groove.

[0012] Preferably, the movable adjustment member includes a sliding plate slidably installed inside the sliding groove, a mounting plate is installed at one end of the sliding plate, a rotating groove is opened on the mounting plate, the mounting plate is sleeved on the outer side of the rotating shaft through the rotating groove, positioning blocks are installed on the sides of the two mounting plates close to each other, the positioning block and the positioning groove on the side of the rotating plate away from the sealing glass plate, a second contact is installed on the positioning block, a third contact is installed on the end of the sliding plate away from the mounting plate, and a connecting block is installed on the sides of the two sliding plates away from each other, and a conductive rod is installed on the connecting block.

[0013] Preferably, a double-headed screw is rotatably installed inside the sliding groove, and the two sliding plates are threadedly connected to the thread grooves in opposite directions on the double-headed screw respectively. One end of the double-headed screw is fixedly connected to the output shaft of the servo motor, and the servo motor is fixedly installed on the sliding frame.

[0014] Preferably, a fourth contact is symmetrically installed on the inner wall of the sliding groove on the side away from the sealing glass plate. When the second contact contacts the first contact, the third contact contacts the fourth contact, so that the heating coil is energized. Two end plates are symmetrically installed at both ends of the sliding groove, and fifth contacts are installed on the end plates. When the two sliding plates move away from each other, the two ends of the conductive rod are respectively in contact with the two fifth contacts, and the servo motor is controlled to be energized to drive the rotating plate to rotate 180 degrees after being energized and then the power is cut off.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) During operation, a longitudinal slot is provided on the door, a sealing glass plate is installed inside the longitudinal slot, and a monitoring camera is provided on the side of the sealing glass plate away from the refrigerated container, so that the monitoring camera does not need to be installed inside the refrigerated container for monitoring, but monitors the inside of the refrigerated container through the sealing glass plate, thereby preventing the monitoring camera from being damaged by low temperature. The monitoring camera moves longitudinally along the longitudinal slot under the drive of the driving motor, which is convenient for monitoring;

[0017] 2) During operation, two water-absorbing rollers are symmetrically arranged on the upper and lower sides of the mounting frame, one of which is in contact with the surface of the sealed glass plate. When the mounting frame moves, the two water-absorbing rollers remove the water mist on the surface of the sealed glass plate, which is convenient for monitoring. At the same time, the rotating plate can be driven to rotate by rotating the motor, and the two water-absorbing rollers are interchanged to facilitate the removal of water mist;

[0018] 3) During operation, the two ends of the conductive rod are in contact with the two fifth contacts by moving the mounting plates away from each other, so that the rotating motor is energized to drive the two water-absorbing rollers to exchange positions. When the two mounting plates are close to each other, the positioning blocks are inserted into the positioning grooves to position the water-absorbing rollers, thereby improving the stability of mist removal. At the same time, the heating coil is energized to generate heat to dry the water-absorbing rollers with high humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached picture:

[0021] Figure 1 This is a schematic diagram of the structure of a port cold chain transportation system based on machine vision assistance of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the visual monitoring component of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the mounting frame of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the water mist removal component of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the water suction roller of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the mobile power connection assembly of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the movable adjustment member of the present invention;

[0028] Figure 8 It is a schematic diagram of the internal structure of the sliding frame of the present invention.

[0029] In the figure: 1. refrigerated container; 2. door; 3. visual monitoring component; 301. longitudinal through groove; 302. sealing glass plate; 303. guide groove; 304. longitudinal screw; 305. driving motor; 306. mounting frame; 307. guide plate; 308. monitoring camera; 4. water mist removal component; 401. fixed plate; 402. rotating plate; 403. connecting shaft; 404. water absorption roller; 405. rotating shaft; 406. driven gear; 407. driving gear; 408. rotating motor ; 409, heating coil; 410, positioning groove; 411, first contact; 5, mobile power connection component; 501, sliding frame; 502, sliding groove; 503, movable adjustment member; 5031, sliding plate; 5032, mounting plate; 5033, positioning block; 5034, second contact; 5035, third contact; 5036, connecting block; 5037, conductive rod; 504, double-headed screw; 505, servo motor; 506, fourth contact; 507, end plate; 508, fifth contact. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Depend on Figure 1-8 The present invention relates to a port cold chain transportation system based on machine vision assistance, comprising a refrigerated container 1, a door 2 is hingedly installed at one end of the refrigerated container 1, a visual monitoring component 3 is installed on the door 2, and cold chain equipment is installed inside the refrigerated container 1;

[0032] The visual monitoring component 3 includes a longitudinal through slot 301 opened inside the door 2, a sealing glass plate 302 is installed at one end of the longitudinal through slot 301 close to the refrigerated container 1, a mounting frame 306 is arranged inside the longitudinal through slot 301, the mounting frame 306 is located on the side of the sealing glass plate 302 away from the refrigerated container 1, a monitoring camera 308 is fixedly installed inside the mounting frame 306, the sealing glass plate 302 is used to facilitate the monitoring camera 308 to monitor the inside of the refrigerated container 1, the water mist removal components 4 are symmetrically installed on the upper and lower sides of the mounting frame 306, the mobile power connection components 5 are symmetrically installed on the upper and lower sides of the mounting frame 306, the guide plates 307 are symmetrically installed on both sides of the mounting frame 306, the guide grooves 303 are symmetrically opened on both sides of the longitudinal through slot 301, and the guide plates 307 are slidably installed inside the guide grooves 303 A longitudinal screw 304 is rotatably installed inside one of the guide grooves 303, and the longitudinal screw 304 is threadedly connected to the guide plate 307. The top of the longitudinal screw 304 is fixedly connected to the output shaft of the driving motor 305, and the driving motor 305 is fixedly installed on the top of the box door 2. The box door 2 is provided with a longitudinal through groove 301, and a sealing glass plate 302 is installed inside the longitudinal through groove 301. A monitoring camera 308 is arranged on the side of the sealing glass plate 302 away from the refrigerated container 1, so that the monitoring camera 308 does not need to be installed inside the refrigerated container 1 for monitoring, but monitors the inside of the refrigerated container 1 through the sealing glass plate 302, so as to avoid damage to the monitoring camera 308 caused by low temperature. The monitoring camera 308 moves longitudinally along the longitudinal through groove 301 under the drive of the driving motor 305, which is convenient for monitoring.

[0033] The water mist removal component 4 includes fixed plates 401 symmetrically installed on the upper and lower sides of the mounting frame 306, two rotating plates 402 are symmetrically arranged on the side where the two fixed plates 401 are close to each other, two connecting shafts 403 are symmetrically installed between the two rotating plates 402, and a water absorbing roller 404 is rotatably installed on the outer side of the connecting shaft 403, one of the water absorbing rollers 404 is in contact with the surface of the sealing glass plate 302, and a rotating shaft 405 is installed on the side where the two rotating plates 402 are away from each other, and the rotating shaft 405 is rotatably connected to the fixed plate 401, and a driven gear 406 is fixedly installed at one end of one of the rotating shafts 405, and a driving gear 407 is meshed and connected below the driven gear 406, and the driving gear 407 is fixedly connected to the output shaft of the rotating motor 408, and the rotating motor 408 is fixedly installed on the fixed plate 401. A heating coil 409 is installed inside the connecting shaft 403, and two positioning grooves 410 are provided on the sides of the two rotating plates 402 that are away from each other. The two positioning grooves 410 on the same side of the two rotating plates 402 are coaxially arranged with the connecting shaft 403 on the same side, and a first contact 411 is installed on the inner wall of the positioning groove 410. The two first contacts 411 are electrically connected to the heating coil 409. Two water absorption rollers 404 are symmetrically arranged on the upper and lower sides of the mounting frame 306, and one of the water absorption rollers 404 is in contact with the surface of the sealing glass plate 302. When the mounting frame 306 moves, the two water absorption rollers 404 remove the water mist on the surface of the sealing glass plate 302, which is convenient for monitoring. At the same time, the rotating plate 402 can be driven to rotate by the rotating motor 408, and the positions of the two water absorption rollers 404 are interchanged to facilitate the removal of water mist.

[0034] The mobile power connection assembly 5 includes a sliding frame 501 fixedly mounted on the upper and lower sides of the mounting frame 306. The sliding frame 501 is located on the side of the rotating plate 402 away from the sealing glass plate 302. A sliding groove 502 is provided inside the sliding frame 501. Two movable adjustment members 503 are slidably installed inside the sliding groove 502. The movable adjustment member 503 includes a sliding plate 5031 slidably installed inside the sliding groove 502. A mounting plate 5032 is installed at one end of the sliding plate 5031. A rotating groove is provided on the mounting plate 5032. The mounting plate 5032 is sleeved on the outer side of the rotating shaft 405 through the rotating groove. The two mounting plates 5032 A positioning block 5033 is installed on the side close to each other, and the positioning block 5033 and the positioning groove 410 on the side of the rotating plate 402 away from the sealing glass plate 302 are installed on the positioning block 5033. A third contact 5035 is installed on the end of the sliding plate 5031 away from the mounting plate 5032. A connecting block 5036 is installed on the side of the two sliding plates 5031 away from each other, and a conductive rod 5037 is installed on the connecting block 5036. A double-headed screw 504 is rotatably installed inside the sliding groove 502, and the two sliding plates 5031 are respectively provided with thread grooves in opposite directions on the double-headed screw 504. The double-headed screw rod 504 is threadedly connected, one end of the double-headed screw rod 504 is fixedly connected to the output shaft of the servo motor 505, and the servo motor 505 is fixedly installed on the sliding frame 501. The fourth contact 506 is symmetrically installed on the inner wall of the sliding groove 502 away from the sealing glass plate 302. When the second contact 5034 contacts the first contact 411, the third contact 5035 contacts the fourth contact 506, so that the heating coil 409 is energized. Two end plates 507 are symmetrically installed at both ends of the sliding groove 502, and the fifth contact 508 is installed on the end plate 507. When the two sliding plates 5031 are away from each other, the conductive rod 50 When the two ends of 37 are in contact with the two fifth contacts 508 respectively, the servo motor 505 is energized to drive the rotating plate 402 to rotate 180 degrees after being energized and then turned off, and the mounting plates 5032 move away from each other so that the two ends of the conductive rod 5037 are in contact with the two fifth contacts 508, so that the rotating motor 408 is energized to drive the two water-absorbing rollers 404 to exchange positions. When the two mounting plates 5032 are close to each other, the positioning block 5033 is inserted into the positioning groove 410 to position the water-absorbing roller 404, thereby improving the stability of water mist removal, and at the same time, the heating coil 409 is energized to generate heat to dry the water-absorbing roller 404 with high humidity.

[0035] Working principle: When working, first place the goods to be transported in the cold chain inside the refrigerated container 1, close the door 2, a longitudinal slot 301 is provided on the door 2, a sealing glass plate 302 is installed inside the longitudinal slot 301, and the goods inside the refrigerated container 1 can be observed through the sealing glass plate 302. A mounting frame 306 is movably installed inside the longitudinal slot 301, and a monitoring camera 308 is arranged on the inner side of the mounting frame 306. When the driving motor 305 is turned on, the rotation of the longitudinal screw 304 can drive the mounting frame 306 to move longitudinally along the longitudinal slot 301. During the movement, the monitoring camera 308 performs mechanical visual auxiliary observation of the goods inside the refrigerated container 1 through the sealing glass plate 302;

[0036] During observation, due to the large temperature difference between the inside and outside of the refrigerated container 1, water mist will form on the surface of the sealing glass plate 302 away from the refrigerated container 1. Two water absorption rollers 404 are symmetrically arranged on the upper and lower sides of the mounting frame 306. One of the water absorption rollers 404 is in contact with the surface of the sealing glass plate 302, so that when the mounting frame 306 moves longitudinally, the water absorption roller 404 can wipe and remove the water mist generated on the surface of the sealing glass plate 302, thereby facilitating observation of the monitoring camera 308.

[0037] When the water absorption amount of the water absorption roller 404 in contact with the sealing glass plate 302 is too high, the servo motor 505 is turned on to rotate the double-headed screw 504, thereby driving the two mounting plates 5032 to move away from each other, so that the positioning block 5033 leaves the inside of the positioning groove 410, until the two ends of the conductive rod 5037 are respectively in contact with the two fifth contacts 508, so that the rotating motor 408 is turned on, so that the driving gear 407 rotates, and the driving gear 407 and the driven gear 406 rotate, thereby driving the rotating plate 402 to rotate 180 degrees, so that the two water absorption rollers 404 exchange positions, which is convenient for the subsequent removal of water mist;

[0038] Then, the servo motor 505 is controlled to pass a reverse current, so that the double-headed screw 504 rotates in the opposite direction, thereby driving the two mounting plates 5032 to approach each other, so that the positioning block 5033 is inserted into the positioning groove 410, and the rotating plate 402 is positioned. At the same time, the second contact 5034 is in contact with the first contact 411, and the third contact 5035 is in contact with the fourth contact 506, so that the heating coil 409 is energized to heat the water-absorbing roller 404, so that the water-absorbing roller 404 with higher humidity is dried to facilitate subsequent processing.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A port cold chain transportation system based on machine vision assistance, comprising a refrigerated container (1), characterized in that: A door (2) is hingedly mounted on one end of the refrigerated container (1), a visual monitoring component (3) is mounted on the door (2), and cold chain equipment is mounted inside the refrigerated container (1); The visual monitoring component (3) comprises a longitudinal through slot (301) provided inside the door (2); a sealing glass plate (302) is installed at one end of the longitudinal through slot (301) close to the refrigerated container (1); a mounting frame (306) is arranged inside the longitudinal through slot (301); the mounting frame (306) is located on a side of the sealing glass plate (302) away from the refrigerated container (1); a monitoring camera (308) is fixedly installed inside the mounting frame (306); the sealing glass plate (302) is used to facilitate the monitoring camera (308) to monitor the inside of the refrigerated container (1); water mist removal components (4) are symmetrically installed on the upper and lower sides of the mounting frame (306); and mobile power connection components (5) are symmetrically installed on the upper and lower sides of the mounting frame (306).

2. The port cold chain transportation system based on machine vision assistance according to claim 1 is characterized by: Guide plates (307) are symmetrically mounted on both sides of the mounting frame (306), guide grooves (303) are symmetrically opened on both sides of the longitudinal through groove (301), the guide plates (307) are slidably mounted inside the guide grooves (303), a longitudinal screw rod (304) is rotatably mounted inside one of the guide grooves (303), the longitudinal screw rod (304) is threadedly connected to the guide plate (307), the top end of the longitudinal screw rod (304) is fixedly connected to the output shaft of the driving motor (305), and the driving motor (305) is fixedly mounted on the top end of the box door (2).

3. The port cold chain transportation system based on machine vision assistance according to claim 1 is characterized by: The water mist removal assembly (4) comprises fixed plates (401) symmetrically mounted on the upper and lower sides of the mounting frame (306), two rotating plates (402) are symmetrically arranged on the sides of the two fixed plates (401) close to each other, two connecting shafts (403) are symmetrically mounted between the two rotating plates (402), and a water absorption roller (404) is rotatably mounted on the outer side of the connecting shaft (403), and one of the water absorption rollers (404) is in contact with the surface of the sealing glass plate (302).

4. The port cold chain transportation system based on machine vision assistance according to claim 3 is characterized by: A rotating shaft (405) is installed on the side of the two rotating plates (402) that is away from each other. The rotating shaft (405) is rotatably connected to the fixed plate (401). A driven gear (406) is fixedly installed on one end of one of the rotating shafts (405). A driving gear (407) is meshedly connected below the driven gear (406). The driving gear (407) is fixedly connected to the output shaft of a rotating motor (408). The rotating motor (408) is fixedly installed on the fixed plate (401).

5. The port cold chain transportation system based on machine vision assistance according to claim 3 is characterized by: A heating coil (409) is installed inside the connecting shaft (403), and two positioning grooves (410) are provided on the sides of the two rotating plates (402) that are away from each other. The two positioning grooves (410) on the same side of the two rotating plates (402) are coaxially arranged with the connecting shaft (403) on the same side, and first contacts (411) are installed on the inner walls of the positioning grooves (410), and the two first contacts (411) are electrically connected to the heating coil (409).

6. The port cold chain transportation system based on machine vision assistance according to claim 1 is characterized by: The mobile power connection assembly (5) comprises a sliding frame (501) fixedly mounted on the upper and lower sides of the mounting frame (306); the sliding frame (501) is located on a side of the rotating plate (402) away from the sealing glass plate (302); a sliding groove (502) is provided inside the sliding frame (501); and two movable adjustment members (503) are slidably mounted inside the sliding groove (502).

7. The port cold chain transportation system based on machine vision assistance according to claim 6 is characterized by: The movable adjustment member (503) comprises a sliding plate (5031) slidably mounted inside the sliding groove (502); a mounting plate (5032) is mounted on one end of the sliding plate (5031); a rotating groove is provided on the mounting plate (5032); the mounting plate (5032) is sleeved on the outer side of the rotating shaft (405) through the rotating groove; a positioning block (5033) is mounted on the side of the two mounting plates (5032) close to each other; the positioning block (5033) and the positioning groove (410) on the side of the rotating plate (402) away from the sealing glass plate (302); a second contact point (5034) is mounted on the positioning block (5033); a third contact point (5035) is mounted on the end of the sliding plate (5031) away from the mounting plate (5032); a connecting block (5036) is mounted on the side of the two sliding plates (5031) away from each other; and a conductive rod (5037) is mounted on the connecting block (5036).

8. The port cold chain transportation system based on machine vision assistance according to claim 7 is characterized in that: A double-headed screw (504) is rotatably mounted inside the sliding groove (502), and two sliding plates (5031) are respectively threadedly connected to thread grooves in opposite directions on the double-headed screw (504), one end of the double-headed screw (504) is fixedly connected to the output shaft of the servo motor (505), and the servo motor (505) is fixedly mounted on the sliding frame (501).

9. The port cold chain transportation system based on machine vision assistance according to claim 8 is characterized in that: A fourth contact (506) is symmetrically installed on the inner wall of the sliding groove (502) away from the sealing glass plate (302). When the second contact (5034) contacts the first contact (411), the third contact (5035) contacts the fourth contact (506), so that the heating coil (409) is energized. Two end plates (507) are symmetrically installed at both ends of the sliding groove (502), and a fifth contact (508) is installed on the end plate (507). When the two sliding plates (5031) move away from each other, the two ends of the conductive rod (5037) contact the two fifth contacts (508) respectively, and the servo motor (505) is controlled to be energized to drive the rotating plate (402) to rotate 180 degrees after being energized and then be de-energized.

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