A harness oiler coating device

Abstract

The application discloses a kind of wire harness oil agent coating devices, comprising: wire rack, coating device, drying device, take-up reel.Several wire output rollers are installed on wire rack, for the wire harness of output to be coated with oil agent;Coating device is arranged at the output end of wire rack;Oil agent pool and coating roller are installed on coating device;Coating roller is configured to be rotatable to move into oil agent coating pool;The input end of drying device is opposite the output end of coating device;Drying tank, electric heating oven and moving assembly are installed on drying device;Drying roller group is arranged on both sides of drying tank;Electric heating element is arranged in electric heating oven;Moving assembly reciprocates electric heating oven between preheating station and heating station;When electric heating oven is located in heating station, bottom opening is located directly above drying tank;Take-up reel is arranged at the output end of drying device, and several take-up rollers are installed on take-up reel.The application can reduce the problem of uneven heating of wire harness during oil agent coating of wire harness.

Description

Technical Field

[0001] This invention relates to the field of wire harness processing technology, and more particularly to a wire harness oil coating device. Background Technology

[0002] Currently, conventional wire harness oil coating devices typically include, in sequence: a wire feeder, an oil coating tank, a heating chamber, and a take-up rack. The wire harness output from the wire feeder first undergoes oil coating in the oil coating tank, then enters the heating chamber for heating and drying. After drying, the wire harness moves to the take-up rack for winding. The problem with this structure is that existing drying chambers specifically include a heating tank for wire routing and an electric heating element fixed above the tank. However, during the drying process, the electric heating element inside the drying chamber undergoes a gradual heating process after startup. Meanwhile, the wire harness moves within the heating tank. This results in the drying chamber failing to achieve uniform heating of the moving wire harness within the heating tank. Consequently, the drying effect is uneven across different sections of the wire harness, reducing the overall quality of the wire harness processing. Therefore, developing a new wire harness oil coating device to overcome the aforementioned problems in the existing technology is a direction that requires further research by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a wire harness oil coating device that can improve the uniformity of heating and drying of different sections of the wire harness during the drying process.

[0004] This invention provides a wire harness oil coating device, comprising:

[0005] A wire feeder, on which a plurality of wire output rollers are mounted, is configured to output a wire bundle to be coated with an oil.

[0006] A coating device is disposed at the output end of the wire feeder; the coating device is equipped with an oil tank and a coating roller; the coating roller is configured to be rotatably moved into / outside the oil coating tank;

[0007] A drying device is provided, with its input end facing the output end of the coating device. The drying device is equipped with a drying trough, an electric heating oven, and a moving assembly. Drying rollers are arranged on both sides of the drying trough. The electric heating oven has a bottom opening and heating elements are arranged inside. The moving assembly is configured to reciprocate the electric heating oven between a preheating station and a heating station. When the electric heating oven is in the heating station, the bottom opening is directly above the drying trough.

[0008] A take-up frame is provided at the output end of the drying device, and a plurality of take-up rollers are installed on the take-up frame.

[0009] This technical solution involves the following steps: the wire harness to be coated with oil first exits from the wire feeder, winds once on the coating roller in the coating device, and then reaches the drying device. It is then sequentially wound onto the drying rollers on both sides of the drying trough and reaches the take-up frame, finally being gathered onto the take-up roller. Simultaneously, the electric heating oven is preheated at the preheating station. Preheating ends when the preset temperature is reached, at which point the moving assembly is activated, moving the electric heating oven from the preheating station to the heating station. Simultaneously, the coating roller is rotated to move its body into the oil tank, and the take-up roller is started to rotate. The take-up roller begins to drive the wire harness. During this process, the wire harness is immersed in the oil tank as it passes the coating roller. During this process, the surface of the wire harness is coated with oil and moves along the drying trough in the drying device. The electric heating element generates heat radiation, achieving thorough and uniform heating and drying of the moving wire harness segment within the drying trough. This improves the drying efficiency of the oil-coated wire harness in the drying device and enhances the quality of the wire harness. In practice, two drying devices can also be configured. That is, two drying devices are continuously connected end to end between the coating device and the take-up frame, and the two drying devices are respectively equipped with an electric heating oven and a moving component.

[0010] Preferably, in the above-mentioned wire harness oil coating apparatus, the drying device includes: a mounting frame, with the drying tank located within the mounting frame; a guide rack and a drive cylinder are provided on the mounting frame; rollers are mounted on the outer wall of the electric heating oven; the rollers are rotatably mounted on the guide rack; the piston rod of the drive cylinder is fixedly mounted on the outer wall of the electric heating oven, and the drive cylinder is configured to push the electric heating oven along the extension direction of the guide rack. That is, the extension direction of the piston rod of the drive cylinder is parallel to the guide rack. Further, the guide rack extends linearly in the horizontal direction.

[0011] This technical solution employs a drive cylinder to reciprocate the electric heating oven along a guide rack. When the drive cylinder extends its piston rod, the piston rod pushes the electric heating oven from the preheating station to the heating station. After one round of wire harness oil coating is completed, when the drive cylinder retracts its piston rod, the piston rod pulls the heating oven from the heating station back to the preheating station.

[0012] Preferably, in the above-mentioned wire harness oil coating device, the electric heating oven is connected to a blower box, and a fan is installed in the blower box; the electric heating element is configured to be located between the fan and the bottom opening.

[0013] By employing this technical solution: during the drying process of the wire harness in the electric heating oven, a fan is simultaneously activated while the heating element is running. The fan generates airflow that passes through the heating element, forming a hot airflow that passes through the bottom opening and reaches the drying chamber. This improves drying efficiency and reduces the design length of the drying chamber.

[0014] Preferably, in the above-mentioned wire harness oil coating device, a first comb tooth is installed on the coating device; the first comb tooth is located between the coating roller and the wire feed frame; the first comb tooth is connected to a first comb tooth cylinder; the first comb tooth cylinder is used to push the first comb tooth to reciprocate in a direction perpendicular to the wire harness transmission.

[0015] The drying device is equipped with a second comb tooth; the second comb tooth is located between the coating roller and the drying roller group; the second comb tooth is connected to a second comb tooth cylinder; the second comb tooth cylinder is used to push the second comb tooth to reciprocate in a direction perpendicular to the wire harness transmission.

[0016] By adopting this technical solution, during the wire harness transmission process, the wire harness sequentially passes through the first and second comb teeth. The reciprocating movement of the first and second comb teeth adjusts the contact surface between the wire harness and the coating and drying rollers during transmission, preventing marks from forming on these rollers. This extends the service life of the equipment's components and reduces wear and tear costs.

[0017] Preferably, in the above-mentioned wire harness oil coating apparatus, an extrusion assembly is installed on the coating apparatus; the extrusion assembly is configured to be located between the coating roller and the drying device. The extrusion assembly specifically includes an extrusion support, a lower extrusion roller, an upper extruder, and a lifting cylinder; the lower extrusion roller and the lifting cylinder are respectively mounted on the extrusion support; the lifting cylinder is connected to the upper extruder and drives the upper extruder to move closer to / away from the lower extrusion roller. Further, the extrusion assembly is located at the outlet end of the coating apparatus.

[0018] This technical solution employs a lifting cylinder to drive the upper extrusion component close to the lower extrusion roller during processing, causing one side of the wire harness to press against the roller surface. When the oil-contaminated wire harness reaches the extrusion assembly, it passes through the gap between the upper extrusion component and the lower extrusion roller. During this transmission, the wire harness drives the lower extrusion roller to rotate, simultaneously squeezing the surface of the wire harness and removing excess oil. This reduces the design length of the drying tank, thereby reducing the footprint of the equipment. After processing the wire harness, the lifting cylinder raises the upper extrusion component, accelerating the drying process between the upper extrusion component and the lower extrusion roller.

[0019] Preferably, in the above-mentioned wire harness oil coating device, the upper extrusion member includes an extrusion rod, and the end of the extrusion rod facing the lower extrusion roller is provided with a flexible surface; the two ends of the extrusion rod are respectively connected to the lifting cylinder, and the lifting cylinder drives the flexible surface to approach / move away from the lower extrusion roller.

[0020] By employing this technical solution, during the extrusion process, the roller surface of the lower extrusion roller adheres to the lower side of the wire harness, while the flexible surface covers the other sides of the wire harness. This increases the force-bearing surface of the wire harness as it passes through the extrusion assembly, thereby increasing the efficiency of extruding excess oil from the wire harness surface.

[0021] Preferably, in the above-mentioned wire harness oil coating device, the upper extrusion member includes an upper extrusion roller, the two ends of which are rotatably mounted on an upper roller frame; the lifting cylinder is connected to the upper roller frame and drives the upper extrusion roller to approach / move away from the lower extrusion roller.

[0022] This technical solution employs a method where, during the extrusion process, the surface of the lower extrusion roller adheres to the lower side of the wire harness, while the surface of the upper extrusion roller adheres to the upper side. As the wire harness passes through the gap between the lower and upper extrusion rollers, it drives both rollers to rotate synchronously in opposite directions. Simultaneously, the rotation of the lower and upper extrusion rollers extrudes the surface of the wire harness, squeezing out excess oil.

[0023] Preferably, the above-mentioned wire harness oil coating device further includes a sensing component; the sensing component includes an infrared emitting column and an infrared receiving column; the infrared emitting column and the infrared receiving column are respectively fixedly installed on the outer side wall of the mounting frame; the infrared receiving column is configured to face the infrared emitting column, and is used to receive the sensing rays output by the infrared emitting column and generate an alarm signal when the sensing rays are not received.

[0024] By adopting this technical solution, during actual operation, when the drying device enters the start-up state, the operator simultaneously activates the sensing components. When a person approaches the outer wall of the mounting frame from the outside, the human body blocks the sensing rays emitted by the infrared emitting column. At this time, the infrared receiving column does not receive the sensing rays and generates an alarm signal. Therefore, the alarm signal reminds the person to avoid touching the outer wall of the electric heating oven, reducing the occurrence of accidents such as burns caused by touching it.

[0025] Compared with the prior art, the present invention can avoid the problem of uneven drying of different sections of the wire harness during the drying process, and improve the heating uniformity of different sections of the wire harness during the drying process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of Example 1.

[0027] Figure 2 This is a top view of the coating apparatus in Example 1.

[0028] Figure 3 This is a side view of the coating guide roller assembly in Example 1.

[0029] Figure 4 This is a first top view of the drying device in Example 1.

[0030] Figure 5 This is a second top view of the drying device in Example 1.

[0031] Figure 6 This is a schematic diagram of the internal structure of the electric heating oven in Example 1. The air inlet of the air box and the electrical connections between the fan and the heating element are omitted in this figure.

[0032] Figure 7 This is a side view of the coating apparatus in Example 1.

[0033] Figure 8 This is a side view of the coating apparatus in Example 2.

[0034] Figure 9 This is a top view of the coating apparatus in Example 3.

[0035] Figure 10 This is a first top view of the drying device in Example 3.

[0036] Figure 11 This is a first top view of the drying device in Example 4.

[0037] The component names corresponding to the various reference numerals in the figure are as follows:

[0038] 100. Wire feeder; 200. Coating device; 300. Drying device; 400. Wire take-up device;

[0039] 110. Outgoing roller; 120. Outgoing support; 210. Oil tank; 220. Coating roller; 230. Coating guide roller assembly; 240. Extrusion assembly; 221. Coating column; 231. Guide roller; 241. Extrusion support; 242. Lower extrusion roller; 243. Upper extrusion roller; 244. Extrusion rod; 245. Flexible surface; 246. Lifting cylinder; 251. First comb tooth; 252. First comb tooth cylinder; 310. Mounting frame; 320. Guide rack; 330. Drive cylinder; 340. Drying trough; 350. Electric heating oven; 351. Electric heating column; 352. Roller; 353. Electric heating element mounting bracket; 354. Bottom opening; 361. Air box; 362. Fan; 370. Drying roller assembly; 380. Drying guide roller assembly; 391. Second comb tooth; 392. Second comb tooth cylinder; 410. Take-up roller; 510. Infrared emitting column; 520. Infrared receiving column. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0041] Example 1, please refer to Figure 1-7 :

[0042] A wire harness oil coating device 200 includes: a wire feeder 100, a coating device 200, a drying device 300, and a take-up device 400.

[0043] The wire feeder 100 is configured to output a wire bundle to be coated with an oil. Specifically, the wire feeder 100 is equipped with a plurality of wire exit rollers 110 and a wire exit bracket 120. Wire spools are mounted on the wire exit rollers 110; the wire bundle to be coated with an oil is wound on the wire spools; the wire ends of the wire bundle extend through wire holes on the wire exit bracket 120 and are transmitted to the coating device 200.

[0044] The coating device 200 is located at the output end of the wire feeder 100; the coating device 200 is provided with an oil tank 210 and a coating roller 220; the coating roller 220 is rotatably mounted above the oil tank 210, and the coating roller 220 is configured to rotatably move to / outside the oil coating tank; furthermore, rotating shafts are connected to both sides of the coating roller, and the rotating shafts are rotatably mounted on the coating column 221. When the coating roller rotates to the lower side relative to the coating column 221, the coating roller is immersed in the oil tank 210; when the coating roller rotates to the upper side relative to the coating column 221, the coating roller leaves the oil tank 210.

[0045] The coating apparatus 200 is also equipped with a coating guide roller group 230 and an extrusion assembly 240. The coating guide roller group 230 is located at the front end of the coating roller 220 and consists of two vertically arranged guide rollers 231. During operation, the wire harness output from the wire feeder 100 passes through the gap between the two guide rollers 231 and reaches the coating roller. The extrusion assembly 240 is located at the rear end of the coating roller 220. The extrusion assembly 240 further includes an extrusion bracket 241, a lower extrusion roller 242, an upper extrusion member, and a lifting cylinder 246. The lower extrusion roller 242 and the lifting cylinder 246 are respectively mounted on the extrusion bracket 241. The lifting cylinder 246 is connected to the upper extrusion member and drives the upper extrusion member to move closer to / away from the lower extrusion roller 242. Specifically: In this example, the upper extrusion member includes an extrusion rod 244, and the end of the extrusion rod 244 facing the lower extrusion roller 242 is provided with a flexible surface 245; the two ends of the extrusion rod 244 are respectively connected to the lifting cylinder 246, and the lifting cylinder 246 drives the flexible surface 245 to approach / move away from the lower extrusion roller 242.

[0046] The input end of the drying device 300 is directly opposite the output end of the coating device 200. The drying device 300 specifically includes a mounting frame 310, with drying guide roller groups 380 respectively provided on the front and rear sides of the mounting frame 310. The drying guide roller groups 380 have the same structure and working principle as the coating guide roller group 230. The drying tank 340 is located inside the mounting frame 310. The mounting frame 310 is provided with a guide rack 320 and a drive cylinder 330. Rollers 352 are mounted on the outer wall of the electric heating oven 350; the rollers 352 are rotatably mounted on the guide rack 320.

[0047] The drying device 300 is also equipped with a drying trough 340, an electric heating oven 350, and a moving assembly. Drying roller groups 370 are provided on both sides of the drying trough 340. The electric heating oven 350 has a bottom opening 354, and electric heating elements are arranged inside the oven. The moving assembly is configured to push the electric heating oven 350 back and forth between a preheating station and a heating station. The moving assembly uses a drive cylinder 330, the piston rod of which is fixedly mounted on the outer wall of the electric heating oven 350. The drive cylinder 330 is configured to push the electric heating oven 350 along the extending direction of the guide rack 320. When the electric heating oven 350 is in the heating station, the bottom opening 354 is directly above the drying trough 340. In this example, the electric heating elements include several electric heating columns 351 mounted parallel to each other on the electric heating element mounting bracket 353310. An air box 361 is connected to the electric heating oven 350, and a fan 362 is installed in the air box 361; the electric heating element is configured between the fan 362 and the electric heating element. The take-up frame 400 is located at the output end of the drying device 300, and a plurality of take-up rollers 410 are installed on the take-up device.

[0048] In practice, its working process is as follows:

[0049] The wire harness to be coated with the oil first exits from the wire feeder 100, winds once on the coating roller 220 of the coating device 200, and then reaches the drying device 300. It is then sequentially wound onto the drying roller groups 370 on both sides of the drying tank 340 and reaches the take-up frame 400, finally being gathered onto the take-up roller 410. Simultaneously, the electric heating oven 350 is started in advance and preheats at the preheating station. When the temperature reaches the preset value, preheating ends. At this point, the moving component is activated, and the electric heating oven 350 is moved along the guide rack 320 via the drive cylinder 330, moving the electric heating oven 350 from the preheating station to the heating station. Simultaneously, the coating roller 220 is rotated to move its roller body into the oil tank 210, and the take-up roller 410 is started to rotate. The take-up roller 410 begins to drive the wire harness. During the wire harness transmission process, it is immersed in the oil in the oil tank 210 as it passes through the coating roller. During this process, the surface of the wire harness is coated with oil and moves along the drying trough 340 in the drying device 300. The electric heating element generates heat radiation, which fully and evenly heats and dries the wire harness segment moving in the drying trough 340. This improves the drying efficiency of the oil-coated wire harness in the drying device 300 and enhances the preparation quality of the wire harness. When one round of wire harness oil coating is completed, the drive cylinder 330 retracts its piston rod, and the piston rod pulls the hot oven from the heating station back to the preheating station. During the above-mentioned drying process of the wire harness by the electric heating oven 350, the fan 362 is started simultaneously when the electric heating element is activated. The fan 362 forms an airflow that passes through the electric heating element and forms a hot airflow that passes through the bottom opening 354 to reach the drying trough 340. This improves drying efficiency, thereby reducing the design length of the drying tank by 340.

[0050] Example 2, please refer to Figure 8 :

[0051] Compared to Example 1, in Example 2, the upper extrusion component is adjusted to use an upper extrusion roller 243, with both ends of the upper extrusion roller 243 rotatably mounted on an upper roller frame. The lifting cylinder 246 connects to the upper roller frame and drives the upper extrusion roller 243 to move closer to / away from the lower extrusion roller 242. During operation: the roller surface of the lower extrusion roller 242 contacts the lower side of the wire harness, and the roller surface of the upper extrusion roller 243 contacts the upper side of the wire harness. When the wire harness passes through the gap between the lower extrusion roller 242 and the upper extrusion roller 243, the wire harness drives the lower extrusion roller 242 and the upper extrusion roller 243 to rotate synchronously in opposite directions. Simultaneously, the lower extrusion roller 242 and the upper extrusion roller 243 extrude pressure on the surface of the wire harness during rotation, squeezing out excess oil from the surface of the wire harness.

[0052] Example 3, please refer to Figure 9-10 :

[0053] Compared with Example 2, Example 3 further discloses a first comb tooth 251 and a second comb tooth 391. Specifically, the first comb tooth 251 is mounted on the coating device 200 and located between the coating roller 220 and the wire feeder 100. The first comb tooth 251 is connected to a first comb tooth cylinder 252. The first comb tooth cylinder 252 is used to push the first comb tooth 251 to reciprocate in a direction perpendicular to the wire harness transmission. The second comb tooth 391 is mounted on the drying device 300 and located between the coating roller 220 and the drying roller group 370. The second comb tooth 391 is connected to a second comb tooth cylinder 392. The second comb tooth cylinder 392 is used to push the second comb tooth 391 to reciprocate in a direction perpendicular to the wire harness transmission. During its operation: In the wire harness transmission process, the wire harness passes sequentially through the first comb tooth 251 and the second comb tooth 391. By executing the reciprocating movement of the first comb tooth 251 and the second comb tooth 391, the wire harness adjusts its contact surface with the coating roller 220 and the drying roller accordingly during transmission, avoiding marks caused by the wire harness on the coating roller 220 and the drying roller. This extends the service life of the equipment accessories and reduces the wear and tear costs of equipment components.

[0054] Example 4, please refer to Figure 11 :

[0055] Example 4, compared to Example 3, further discloses a sensing component. The sensing component includes an infrared emitting column 510 and an infrared receiving column 520; the infrared emitting column 510 and the infrared receiving column 520 are respectively fixedly installed on the mounting frame 310 at both ends near the outer wall of the drying chamber 340. The infrared emitting column 510 outputs a sensing ray upon power-on; the infrared receiving column 520 is configured to face the infrared emitting column 510, receive the sensing ray output by the infrared emitting column 510, and generate an alarm signal when no sensing ray is received. During operation: when the drying device 300 enters the start-up state, the operator simultaneously activates the sensing component. When a person approaches the outer wall of the mounting frame 310 from the outside, the person blocks the sensing ray output by the infrared emitting column 510. At this time, the infrared receiving column 520 does not receive the sensing ray and generates an alarm signal. Therefore, the alarm signal reminds the person to avoid touching the outer wall of the electric heating oven 350, reducing the occurrence of accidents such as burns due to contact.

[0056] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A wire harness oil coating device, characterized in that, include: A wire feeder, on which a plurality of wire output rollers are mounted, is configured to output a wire bundle to be coated with an oil. A coating device is disposed at the output end of the wire feeder; the coating device is equipped with an oil tank and a coating roller; the coating roller is configured to be rotatably moved into / outside the oil coating tank; A drying device is provided, with its input end facing the output end of the coating device. The drying device is equipped with a drying trough, an electric heating oven, and a moving assembly. Drying rollers are arranged on both sides of the drying trough. The electric heating oven has a bottom opening and heating elements are arranged inside. The moving assembly is configured to reciprocate the electric heating oven between a preheating station and a heating station. When the electric heating oven is in the heating station, the bottom opening is directly above the drying trough. A take-up frame is provided at the output end of the drying device, and a plurality of take-up rollers are installed on the take-up frame.

2. The wire harness oil coating device according to claim 1, characterized in that, The drying device includes: Mounting frame, the drying tank is located inside the mounting frame; The mounting frame is equipped with a guide rack and a drive cylinder; rollers are mounted on the outer wall of the electric heating oven; the rollers are rotatably mounted on the guide rack; The piston rod of the drive cylinder is fixedly mounted on the outer wall of the electric oven, and the drive cylinder is configured to push the electric oven along the extension direction of the guide rack.

3. The wire harness oil coating device according to claim 2, characterized in that, The electric heating oven is connected to a blower box, and a fan is installed in the blower box; the electric heating element is configured to be located between the fan and the bottom opening.

4. The wire harness oil coating device according to claim 3, characterized in that, The coating device is equipped with a first comb tooth; the first comb tooth is located between the coating roller and the wire feeder; the first comb tooth is connected to a first comb tooth cylinder; the first comb tooth cylinder is used to push the first comb tooth to reciprocate in a direction perpendicular to the wire harness transmission. The drying device is equipped with a second comb tooth; the second comb tooth is located between the coating roller and the drying roller group; the second comb tooth is connected to a second comb tooth cylinder; the second comb tooth cylinder is used to push the second comb tooth to reciprocate in a direction perpendicular to the wire harness transmission.

5. The wire harness oil coating apparatus according to claim 4, characterized in that, The coating device is equipped with an extrusion assembly; The extrusion assembly includes an extrusion bracket, a lower extrusion roller, an upper extrusion member, and a lifting cylinder; the lower extrusion roller and the lifting cylinder are respectively mounted on the extrusion bracket; the lifting cylinder is connected to the upper extrusion member and drives the upper extrusion member to move closer to / away from the lower extrusion roller.

6. The wire harness oil coating apparatus according to claim 5, characterized in that, The upper extrusion member includes an extrusion rod, and one end of the extrusion rod facing the lower extrusion roller has a flexible surface; the two ends of the extrusion rod are respectively connected to the lifting cylinder, and the lifting cylinder drives the flexible surface to approach / move away from the lower extrusion roller.

7. The wire harness oil coating apparatus according to claim 6, characterized in that, The upper extrusion component includes an upper extrusion roller, the two ends of which are rotatably mounted on an upper roller frame; the lifting cylinder is connected to the upper roller frame and drives the upper extrusion roller to approach / move away from the lower extrusion roller.

8. The wire harness oil coating apparatus according to claim 7, characterized in that, It also includes sensing components; The sensing component includes: an infrared emitting column and an infrared receiving column; The infrared emitting column and the infrared receiving column are respectively fixedly installed on the outer side wall of the mounting frame; the infrared receiving column is configured to face the infrared emitting column, and is used to receive the sensing rays output by the infrared emitting column and generate an alarm signal when the sensing rays are not received.

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