A covering device for cable production

Abstract

The application belongs to the technical field of cable coating, and particularly relates to a coating device for cable production, which comprises an electrical control cabinet and an extruder main body installed on the top of the electrical control cabinet, the discharge end of the extruder main body is provided with an extrusion die head, a pressure-keeping feeding unit is arranged between the extruder main body and the extrusion die head, the pressure-keeping feeding unit comprises: a heat-insulating shell, the heat-insulating shell is arranged between the extruder main body and the extrusion die head, a transition pipe which is in communication with the discharge end of the extruder main body is fixedly inserted into the side wall of the heat-insulating shell, and a feeding pipe which is in communication with the feeding end of the extrusion die head is also fixedly inserted into the side wall of the heat-insulating shell. The application effectively avoids the unstable extrusion discharge problems caused by material bridging, uneven feeding and material level fluctuation, stabilizes the cable insulation coating discharge state, improves the overall compactness of the molten material, reduces the insulation layer bubble defects, and greatly improves the overall quality of the cable insulation coating.

Description

Technical Field

[0001] This invention belongs to the field of cable sheathing technology, and in particular relates to a sheathing device for cable production. Background Technology

[0002] Cable insulation coating refers to the process of wrapping an insulating protective layer on the outside of the cable core. It is a core process to ensure the electrical insulation performance and safety of the cable. At present, cable coating forming equipment is mainly divided into three types: extrusion type, wrapping type and coating type. Among them, extrusion equipment has become the mainstream equipment for cable insulation coating due to its advantages of stable forming and wide adaptability.

[0003] Screw extruders mainly consist of a hopper, screw barrel, extrusion die, and traction mechanism. They melt and plasticize plastic raw materials, then uniformly coat the surface of a wire core traveling at a constant speed through an annular die. After cooling and shaping, the insulation layer is continuously coated. However, in actual production, extruders may experience problems such as material bridging, uneven feeding, and material level fluctuations, leading to intermittent molten material supply and localized material gaps. Although subsequent molten material can be quickly replenished without affecting continuous extrusion, it causes unstable extrusion pressure, affecting the discharge pressure at the die. This can result in defects such as uneven thickness of the cable insulation layer, affecting cable insulation performance and making subsequent troubleshooting difficult. Furthermore, with the development of power systems, large DC converter transformers and other power equipment place increasingly higher demands on cable quality, imposing stringent standards on the uniformity, density, and bubble-free nature of the cable insulation layer. Traditional extrusion coating equipment cannot offset the extrusion pressure changes caused by feeding fluctuations, making it difficult to consistently guarantee insulation coating quality and meet the needs of large-scale, high-precision production of high-quality power cables. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a coating device for cable production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sheathing device for cable production, comprising an electrical control cabinet and an extruder body mounted on the top of the electrical control cabinet, wherein an extrusion die is provided on one side of the discharge end of the extruder body, and a pressure-holding feeding unit is provided between the extruder body and the extrusion die, the pressure-holding feeding unit comprising:

[0006] A heat insulation shell is disposed between the extruder body and the extrusion die. A transition pipe connected to the discharge end of the extruder body is fixedly inserted into the side wall of the heat insulation shell. A feed pipe connected to the feed end of the extrusion die is also fixedly inserted into the side wall of the heat insulation shell, and the feed pipe is located below the transition pipe.

[0007] A spiral feeding mechanism is located inside the heat insulation shell, and the discharge end of the spiral feeding mechanism is connected to the feed pipe;

[0008] The material blocking and extrusion mechanism is located inside the heat insulation shell and above the screw feeding mechanism.

[0009] Preferably, the spiral feeding mechanism includes a discharge pipe fixedly inserted into the side wall of the heat insulation shell, a tapered pipe fixedly connected to the end of the discharge pipe and connected to the feed pipe, a drive shaft rotatably connected to the side wall of the heat insulation shell, one end of the drive shaft extending to the discharge end of the discharge pipe, a spiral feeding blade fixedly sleeved on the drive shaft, and when the spiral feeding blade rotates with the drive shaft, the spiral feeding blade squeezes the molten material inside the heat insulation shell into the discharge pipe, a drive motor fixed to the side wall of the electrical control cabinet, and the output end of the drive motor being connected to the drive shaft via a belt drive assembly, and the drive motor being electrically connected to the electrical control cabinet.

[0010] Preferably, the material blocking and extrusion mechanism includes a material blocking block fixed inside the upper side of the heat insulation shell. The top of the material blocking block is provided with a conical groove, and the bottom of the conical groove is provided with a discharge hole. A material blocking ball is provided below the material blocking block, and the wall of the material blocking ball abuts against the lower wall of the discharge hole. The material blocking ball is equipped with an elastic support component.

[0011] Preferably, the elastic support assembly includes L-shaped rods fixed on both sides of the material blocking ball, a connecting block fixed at the end of the L-shaped rod away from the material blocking ball, a groove matching the connecting block being opened at the bottom of the material blocking block, and a support spring fixed between the bottom of the groove and the connecting block.

[0012] Preferably, an exhaust pipe is inserted through the surface of the baffle block, and the end of the exhaust pipe away from the baffle block is fixedly connected to the inner side wall of the heat insulation shell. The side wall of the heat insulation shell is provided with an exhaust hole that communicates with the exhaust pipe.

[0013] Preferably, a frame-shaped heating plate is fixed inside the heat insulation shell. The frame-shaped heating plate is located between the baffle block and the spiral pusher blades, and the frame-shaped heating plate is electrically connected to the electrical control cabinet.

[0014] Preferably, a thermocouple probe is fixedly inserted into the bottom of the heat insulation shell, and the thermocouple probe is offset from the spiral pusher blades. The electrical control cabinet controls the frame-shaped heating plate to work according to the electrical signal fed back by the thermocouple probe.

[0015] Preferably, the side wall of the heat insulation shell has a detection hole, which is connected to the interior of the groove on the same side. A connecting rod is provided inside the detection hole, and the connecting rod is fixedly connected to the side wall of the connecting block on the same side. A detection shell corresponding to the position of the detection hole is fixed on the outer side wall of the heat insulation shell, and the end of the connecting rod away from the connecting block extends into the interior of the detection shell. A positioning post is fixed at the end of the connecting rod inside the detection shell. A light-transmitting hole is provided at the top of the heat insulation shell, and a transparent block is fixed inside the light-transmitting hole. An infrared ranging probe is fixed at the top of the detection shell. The infrared ranging probe is used to detect the position of the positioning post, and the infrared ranging probe is electrically connected to the electrical control cabinet.

[0016] Compared with existing technologies, the advantages of a sheathing device for cable production are:

[0017] 1. Through the electrical control cabinet, extruder body, and extrusion die, cables can be extruded and coated. By cooperating with the heat insulation shell, transition pipe, feed pipe, and spiral pusher mechanism, a transition cavity for molten material can be added between the discharge end of the extruder body and the feed end of the extrusion die. The material is fed by a separate pusher structure, which can separate the discharge of the extrusion die from the discharge of the extruder body. This effectively avoids the instability of molten material extrusion caused by material bridging, uneven feeding, and material level fluctuations in the extruder body, which affects the normal discharge of the extrusion die. This effectively improves the discharge stability of the extrusion die and reduces the phenomenon of uneven insulation layer thickness caused by such problems.

[0018] 2. By setting up a material-blocking and extrusion mechanism, the falling resistance of the molten material is increased, which can increase the falling pressure of the molten material. The falling pressure can improve the compactness of the material and facilitate the discharge of air that may be contained in the molten material, thereby minimizing defects such as bubbles that may be generated in the cable insulation layer and improving the cable's covering quality.

[0019] 3. Through the cooperation of the set detection holes, connecting rods, detection shells, positioning columns, transparent blocks, and infrared ranging probes, the extrusion pressure fluctuation of the extruder body can be judged based on the position change of the positioning column. When the pressure fluctuation is frequent, it will remind personnel to investigate the cause in time and avoid frequent fluctuations in extrusion pressure from affecting the cable sheathing quality. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a sheathing device for cable production provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the back structure of a sheathing device for cable production provided by the present invention;

[0022] Figure 3This is a schematic diagram of the structure of a pressure-holding feeding unit for a cable production sheathing device provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the heat insulation shell of a sheathing device for cable production provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the bottom structure of a baffle block for a cable production coating device provided by the present invention;

[0025] Figure 6 This is a cross-sectional view of a material-blocking structure of a sheathing device for cable production provided by the present invention;

[0026] Figure 7 This invention provides a coating device for cable production. Figure 6 Enlarged view of the structure of part A in the middle.

[0027] In the diagram: 1 Electrical control cabinet, 2 Extruder body, 3 Extrusion die, 4 Pressure holding and feeding unit, 5 Heat insulation shell, 6 Transition pipe, 7 Feed pipe, 8 Spiral pusher mechanism, 81 Discharge pipe, 82 Conical pipe, 83 Drive shaft, 84 Spiral pusher blade, 85 Drive motor, 86 Belt drive assembly, 9 Material blocking and extrusion mechanism, 91 Stop block, 92 Conical groove, 93 Discharge hole, 94 Material blocking ball, 10 Elastic support assembly, 101 L-shaped rod, 102 Connecting block, 103 Groove, 104 Support spring, 11 Exhaust pipe, 12 Exhaust hole, 13 Frame-shaped heating plate, 14 Thermocouple probe, 15 Detection hole, 16 Connecting rod, 17 Detection shell, 18 Positioning column, 19 Transparent block, 20 Infrared ranging probe. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] like Figures 1-7As shown, a sheathing device for cable production includes an electrical control cabinet 1 and an extruder body 2 mounted on top of the electrical control cabinet 1. An extrusion die 3 is provided on one side of the extrusion body 2's discharge end. A pressure-holding feeding unit 4 is provided between the extrusion body 2 and the extrusion die 3. The pressure-holding feeding unit 4 includes: a heat-insulating shell 5, which is disposed between the extrusion body 2 and the extrusion die 3. A transition pipe 6, communicating with the discharge end of the extrusion body 2, is fixedly inserted into the side wall of the heat-insulating shell 5. A feed pipe 7, communicating with the feed end of the extrusion die 3, is also fixedly inserted into the side wall of the heat-insulating shell 5 and is located below the transition pipe 6. A spiral pushing mechanism 8 is disposed inside the heat-insulating shell 5, and its discharge end is connected to the feed pipe 7. The spiral pushing mechanism 8 includes a discharge pipe 81 fixedly inserted into the side wall of the heat-insulating shell 5. A tapered pipe 82 is fixedly connected to the end of the discharge pipe 81. The tube 82 is connected to the feed pipe 7. The side wall of the heat insulation shell 5 is rotatably connected to the drive shaft 83, and one end of the drive shaft 83 extends to the discharge end of the discharge pipe 81. The drive shaft 83 is fixedly sleeved with a spiral pusher blade 84. When the spiral pusher blade 84 rotates with the drive shaft 83, it pushes the molten material inside the heat insulation shell 5 into the discharge pipe 81. The side wall of the electrical control cabinet 1 is fixed with a drive motor 85, and the output end of the drive motor 85 is connected to the drive shaft 83 through the belt drive assembly 86. The drive motor 85 is electrically connected to the electrical control cabinet 1. The spiral pusher blade 84 adopts a right-hand continuous solid spiral structure with a spiral helix angle of 18°, a blade working surface inclination angle of 6°, a blade outer diameter of 44mm, and a single turn pitch of 50mm. The blade root thickness is 6mm and the outer edge thickness is 3mm. The belt drive assembly 86 includes components such as pulleys, belts, and protective covers.

[0030] The material blocking and extrusion mechanism 9 is located inside the heat insulation shell 5 and above the spiral feeding mechanism 8. The material blocking and extrusion mechanism 9 includes a material blocking block 91 fixed inside the upper side of the heat insulation shell 5. The top of the material blocking block 91 is provided with a conical groove 92, and the bottom of the conical groove 92 is provided with a discharge hole 93. The material blocking ball 94 is provided below the material blocking block 91, and the ball wall of the material blocking ball 94 abuts against the lower side wall of the discharge hole 93. The material blocking ball 94 is equipped with an elastic support assembly 10. The elastic support assembly 10 includes L-shaped rods 101 fixed on both sides of the material blocking ball 94. A connecting block 102 is fixed at the end of the L-shaped rod 101 away from the material blocking ball 94. The bottom of the material blocking block 91 is provided with a groove 103 that matches the connecting block 102. A support spring 104 is fixed between the bottom of the groove 103 and the connecting block 102. The support spring 104 is made of a high-temperature resistant material.

[0031] An exhaust pipe 11 is inserted through the surface of the baffle block 91. The end of the exhaust pipe 11 away from the baffle block 91 is fixedly connected to the inner side wall of the heat insulation shell 5. An exhaust hole 12 connected to the exhaust pipe 11 is opened on the side wall of the heat insulation shell 5. Through the exhaust pipe 11 and the exhaust hole 12, the air squeezed out by the molten material can be quickly discharged.

[0032] A frame-shaped heating plate 13 is fixed inside the heat insulation shell 5. The frame-shaped heating plate 13 is located between the baffle block 91 and the spiral pusher blade 84, and the frame-shaped heating plate 13 is electrically connected to the electrical control cabinet 1. The frame-shaped heating plate 13 can heat and keep the molten material inside the heat insulation shell 5, ensuring that the molten material maintains a suitable coating temperature.

[0033] A thermocouple probe 14 is fixedly inserted into the bottom of the heat insulation shell 5, and the thermocouple probe 14 is offset from the spiral pusher blade 84. The electrical control cabinet 1 controls the frame-shaped electric heating plate 13 to work according to the electrical signal fed back by the thermocouple probe 14. The thermocouple probe 14 can monitor the temperature of the molten material and convert the temperature into an electrical signal to be fed back to the electrical control cabinet 1. The electrical control cabinet 1 controls the heating temperature of the frame-shaped electric heating plate 13 according to the temperature fed back by the thermocouple probe 14, so that the molten material inside the heat insulation shell 5 can maintain a suitable temperature.

[0034] The heat insulation shell 5 has a detection hole 15 on its side wall, which is connected to the interior of the groove 103 on the same side. A connecting rod 16 is provided inside the detection hole 15, and the connecting rod 16 is fixedly connected to the side wall of the connecting block 102 on the same side. A detection shell 17 corresponding to the position of the detection hole 15 is fixed to the outer side wall of the heat insulation shell 5, and the end of the connecting rod 16 away from the connecting block 102 extends into the interior of the detection shell 17. A positioning post 18 is fixed to the end of the connecting rod 16 inside the detection shell 17. A light-transmitting hole is provided at the top of the heat insulation shell 5, and the interior of the light-transmitting hole... A transparent block 19 is fixed in place, and an infrared ranging probe 20 is fixed on the top of the detection shell 17. The infrared ranging probe 20 is used to detect the position of the positioning post 18. The infrared ranging probe 20 is electrically connected to the electrical control cabinet 1. The infrared ranging probe 20 is covered by a cable and will synchronously detect the position of the positioning post 18. It emits an infrared beam and receives the beam reflected back from the positioning post 18. By calculating the time required for the emitted beam to be received, the position of the positioning post 18 can be determined. The transparent block 19 is made of high-temperature resistant quartz material, and the detection shell 17 is made of heat-insulating material.

[0035] The operating principle of the present invention is explained as follows: The cable core to be wrapped is passed through the central through hole of the extrusion die 3 and the wiring positioning is completed. Then the wrapping work is started through the electrical control cabinet 1. The electrical control cabinet 1 will control the extruder body 2 to work. The extruder body 2 heats and melts the granular insulating material, and finally pushes the molten material into the heat insulation shell 5 through the transition tube 6.

[0036] The molten material entering the heat insulation shell 5 falls into the conical groove 92 and the discharge hole 93. Supported by the support spring 104, the baffle ball 94 prevents the molten material from flowing downwards. As the extruder body 2 continues to feed molten material into the heat insulation shell 5, the molten material eventually fills the space above the baffle block 91 inside the heat insulation shell 5. At this point, under the extrusion pressure, the support spring 104 is stretched downwards, and the baffle ball 94 moves downwards. Subsequently, the molten material flows through the gap between the baffle ball 94 and the baffle block 91 to the bottom of the heat insulation shell 5. Due to the obstruction of the baffle ball 94... The molten material needs to fill the space above the baffle block 91, and the pressure generated by the extruder needs to continue extruding the material to discharge the molten material below the baffle block 91. Therefore, the molten material will be resisted by the baffle ball 94. Under the action of extrusion pressure and this resistance, the molten material can be made to accumulate more densely, and the air that may be contained inside will be squeezed out. The discharged air will enter the exhaust pipe 11 through the space below the discharge hole 93, and finally be discharged through the exhaust hole 12. By discharging the air in the molten material, the probability of generating bubble defects in the insulation layer of the subsequent cable sheath can be reduced.

[0037] As more and more molten material accumulates inside the heat insulation shell 5 below the baffle block 91, and the material level surpasses the top of the frame-shaped heating plate 13, the drive motor 85 is activated via the electrical control cabinet 1 (a material level sensor is installed on the side wall of the heat insulation shell 5; after detecting that the material level has reached the set height, the material level sensor sends an electrical signal to the electrical control cabinet 1, which then activates the drive motor 85). The drive motor 85 drives the spiral pusher blades 84 to rotate via the belt drive assembly 86 and the drive shaft 83. Under the action of rotational extrusion and axial pushing, the spiral pusher blades 84 can extrude the molten material... The molten material is pushed into the discharge pipe 81, and then enters the feed pipe 7 through the conical pipe 82. Finally, it forms a continuous annular material layer through the extrusion die 3, so that the molten insulating material can be evenly and densely wrapped around the outside of the traveling cable core, completing the insulation layer wrapping operation of the cable core. Since the molten material entering the extrusion die 3 is pushed separately by the spiral pusher blades 84, and there is redundant molten material in the heat insulation shell 5, it can be ensured that the molten material entering the extrusion die 3 remains stable and reliable, and the extrusion wrapping quality will not be affected by the fluctuation of the molten material produced by the extruder body 2.

[0038] Meanwhile, during the coating process, if the extruder body 2 experiences localized voids in the molten material due to issues such as material bridging, uneven feeding, or material level fluctuations, the pressure exerted by the extruder body 2 to move the molten material will decrease due to these voids. Consequently, the extrusion pressure of the molten material inside the heat insulation shell 5 will also decrease. At this time, the downward pressure on the resisting ball 94 will decrease synchronously, causing the support spring 104 to pull the resisting ball 94 upwards via the connecting block 102 and the L-shaped rod 101. Simultaneously, the positioning post 18 adjacent to the connecting block 102 will move synchronously. Meanwhile, the infrared ranging probe 20, while the cable is being coated, will simultaneously detect the position of the positioning post 18 by emitting an infrared beam and connecting to it. The beam reflected back from the positioning column 18 is received. By calculating the time required for the beam to travel from the emitted beam to the received beam, the position of the positioning column 18 can be determined. The position of the positioning column 18 is determined and converted into an electrical signal and fed back to the electrical control cabinet 1. This allows for real-time measurement of the extrusion pressure fluctuation of the extruder body. When the position change frequency of the positioning column 18 is higher than 10 times / minute, or when the position change exceeds 1.5mm, the electrical control cabinet 1 will issue voice prompts to remind personnel to check the working status of the extruder body 2 in a timely manner, quickly troubleshoot faults such as hopper bridging, poor material feeding, and unstable material level, and restore a continuous and stable supply of molten material.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. A sheathing device for cable production, comprising an electrical control cabinet (1) and an extruder body (2) mounted on top of the electrical control cabinet (1), wherein an extrusion die (3) is provided on one side of the discharge end of the extruder body (2), characterized in that, A pressure-holding and feeding unit (4) is provided between the extruder body (2) and the extrusion die (3), and the pressure-holding and feeding unit (4) includes: A heat insulation shell (5) is disposed between the extruder body (2) and the extrusion die (3). A transition pipe (6) connected to the discharge end of the extruder body (2) is fixedly inserted into the side wall of the heat insulation shell (5). A feed pipe (7) connected to the feed end of the extrusion die (3) is also fixedly inserted into the side wall of the heat insulation shell (5). The feed pipe (7) is located below the transition pipe (6). The spiral feeding mechanism (8) is located inside the heat insulation shell (5), and the discharge end of the spiral feeding mechanism (8) is connected to the feed pipe (7); The material blocking and extrusion mechanism (9) is located inside the heat insulation shell (5) and above the spiral pusher mechanism (8).

2. The sheathing device for cable production according to claim 1, characterized in that, The spiral feeding mechanism (8) includes a discharge pipe (81) fixedly inserted into the side wall of the heat insulation shell (5). A tapered pipe (82) is fixedly connected to the end of the discharge pipe (81), and the tapered pipe (82) is connected to the feed pipe (7). A drive shaft (83) is rotatably connected to the side wall of the heat insulation shell (5), and one end of the drive shaft (83) extends to the discharge end of the discharge pipe (81). A spiral feeding blade (84) is fixedly sleeved on the drive shaft (83). When the spiral feeding blade (84) rotates with the drive shaft (83), the spiral feeding blade (84) pushes the molten material inside the heat insulation shell (5) into the discharge pipe (81). A drive motor (85) is fixedly installed on the side wall of the electrical control cabinet (1), and the output end of the drive motor (85) is connected to the drive shaft (83) through a belt drive assembly (86). The drive motor (85) is electrically connected to the electrical control cabinet (1).

3. A sheathing device for cable production according to claim 2, characterized in that, The material blocking and extrusion mechanism (9) includes a material blocking block (91) fixed inside the upper side of the heat insulation shell (5). The top of the material blocking block (91) is provided with a conical groove (92), and the bottom of the conical groove (92) is provided with a discharge hole (93). The material blocking ball (94) is provided below the material blocking block (91), and the ball wall of the material blocking ball (94) abuts against the lower side wall of the discharge hole (93). The material blocking ball (94) is equipped with an elastic support component (10).

4. A sheathing device for cable production according to claim 3, characterized in that, The elastic support assembly (10) includes an L-shaped rod (101) fixed on both sides of the material blocking ball (94). A connecting block (102) is fixed at one end of the L-shaped rod (101) away from the material blocking ball (94). A groove (103) matching the connecting block (102) is opened at the bottom of the material blocking block (91). A support spring (104) is fixed between the bottom of the groove (103) and the connecting block (102).

5. A sheathing device for cable production according to claim 3, characterized in that, An exhaust pipe (11) is inserted through the surface of the baffle block (91). The end of the exhaust pipe (11) away from the baffle block (91) is fixedly connected to the inner wall of the heat insulation shell (5). An exhaust hole (12) communicating with the exhaust pipe (11) is opened on the side wall of the heat insulation shell (5).

6. A sheathing device for cable production according to claim 3, characterized in that, The heat insulation shell (5) has a frame-shaped heating plate (13) fixed inside. The frame-shaped heating plate (13) is located between the baffle block (91) and the spiral pusher blade (84), and the frame-shaped heating plate (13) is electrically connected to the electrical control cabinet (1).

7. A sheathing device for cable production according to claim 6, characterized in that, Thermocouple probe (14) is fixedly inserted into the bottom of the heat insulation shell (5), and the thermocouple probe (14) is offset from the spiral pusher blade (84). The electrical control cabinet (1) controls the frame-shaped electric heating plate (13) to work according to the electrical signal fed back by the thermocouple probe (14).

8. A sheathing device for cable production according to claim 4, characterized in that, The heat insulation shell (5) has a detection hole (15) on its side wall, and the detection hole (15) is connected to the interior of the groove (103) on the same side. The detection hole (15) has a connecting rod (16) inside, and the connecting rod (16) is fixedly connected to the side wall of the connecting block (102) on the same side. The outer side wall of the heat insulation shell (5) is fixed with a detection shell (17) corresponding to the position of the detection hole (15), and the end of the connecting rod (16) away from the connecting block (102) extends into the interior of the detection shell (17). The end of the connecting rod (16) located inside the detection shell (17) is fixed with a positioning post (18). The top of the heat insulation shell (5) has a light-transmitting hole, and a transparent block (19) is fixed inside the light-transmitting hole. The top of the detection shell (17) is fixed with an infrared ranging probe (20), which is used to detect the position of the positioning post (18). The infrared ranging probe (20) is electrically connected to the electrical control cabinet (1).

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