A testing device for the tensile recovery properties of textiles

Abstract

This invention relates to the field of textile inspection technology, specifically to a textile tensile recovery performance testing device, comprising a testing base with a testing cover fixedly connected to its top; and a fixing mechanism including two fixing plates fixedly connected to the inner wall of the testing cover, each fixing plate having a sliding groove at its top. This device offers superior textile fixing performance. This is achieved through a dual fixing structure: the main fixing component uses a miniature electric telescopic rod to drive a fixing strip to press the fabric edge, and a first motor drives the fixing rod to rotate and roll up the fabric, ensuring the fabric is flat and not loose; the auxiliary fixing component uses the first electric telescopic rod to drive a pressing plate to further press the fabric from above, while the magnetic adsorption of the electromagnetic block and permanent magnet block, along with the cooperation of the plastic spring, stably maintains the fixed state during stretching, effectively preventing fabric loosening, wrinkling, or slippage, ensuring uniform force during testing, and improving the accuracy of key data.

Description

Technical Field

[0001] This invention relates to the field of textile testing technology, specifically to a device for testing the tensile recovery properties of textiles. Background Technology

[0002] Tensile recovery properties of textiles are a key indicator of their quality and durability, directly affecting their morphological stability and lifespan during daily use, washing, and processing. With the rapid development of the textile industry, market demands for textile performance are increasing, making accurate testing of tensile recovery properties a crucial requirement in production, quality inspection, and research and development.

[0003] Existing textile tensile recovery performance testing equipment has two main problems: First, the fixation effect on textiles is not good, and the fabric is prone to loosening, wrinkling, or slippage during the stretching process, resulting in uneven stress during the test and directly affecting the accuracy of key data such as stretching and shrinkage. Second, there is a lack of comprehensive testing methods. Most equipment can only test the tensile recovery of textiles, and it is difficult to simultaneously detect whether there is damage and the location of damage during the stretching process. Additional equipment or manual assistance is required, which increases the complexity of the testing process and the risk of error, and cannot efficiently and comprehensively reflect the tensile recovery performance and overall quality of textiles. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a textile tensile recovery performance testing device, which can effectively solve the problems of poor fixation effect and lack of comprehensive testing methods for textiles in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a testing device for the tensile recovery properties of textiles, including a testing base, with a testing cover fixedly connected to the top of the testing base;

[0007] The fixing mechanism includes two fixing plates fixedly connected to the inner wall of the detection cover. Each fixing plate has a sliding groove at its top end. A permanent magnet is slidably connected to the inner wall of the sliding groove. A mounting plate is fixedly connected to the top end of the permanent magnet. An auxiliary fixing component is provided at the top end of the mounting plate. A main fixing component is provided on the side wall of the mounting plate.

[0008] The testing mechanism includes a connecting block that is slidably connected to the bottom wall of the testing chamber. A second electric telescopic rod is fixedly connected to the bottom end of the connecting block. The telescopic end of the second electric telescopic rod has a telescopic groove. A sliding column is slidably connected to the inner wall of the telescopic groove. A pressing plate is fixedly connected to the bottom end of the sliding column. A first sliding rheostat is provided together with the pressing plate and the inner wall of the testing chamber.

[0009] Preferably, the auxiliary fixing component includes a fixing frame fixedly connected to the top of the mounting plate, a first electric telescopic rod fixedly connected to the bottom of the fixing frame, a pressing plate fixedly connected to the bottom of the first electric telescopic rod, and a second sliding rheostat jointly provided at the top of the fixing frame and the inner wall of the detection cover.

[0010] Preferably, the main fixing component includes two symmetrical connecting plates fixedly connected to the side wall of the mounting plate, one of the connecting plates having a first motor fixedly connected to its outer wall, the output end of the first motor having a fixed rod fixedly connected to its output end, the outer wall of the fixed rod having a sliding groove, the inner wall of the sliding groove having two symmetrical miniature electric telescopic rods fixedly connected to its inner wall, the telescopic ends of the two miniature electric telescopic rods having a fixed strip fixedly connected to their telescopic ends, the outer wall of the fixed strip being slidably connected to the inner wall of the sliding groove.

[0011] Preferably, an electromagnetic block is fixedly connected to the inner wall of the slide, and the electromagnetic block is magnetically attracted to the permanent magnet. Two symmetrical blocking blocks are fixedly connected to the inner wall of the slide, and the blocking blocks are in contact with the outer wall of the permanent magnet. A plastic spring is fixedly connected to the outer wall of the permanent magnet on the side away from the electromagnetic block, and the other end of the plastic spring is fixedly connected to the inner wall of the slide.

[0012] Preferably, the detection mechanism further includes vertical plates fixedly connected to the outer walls of both sides of the detection cover, a second motor fixedly connected to the outer wall of one of the vertical plates, a threaded rod fixedly connected to the output end of the second motor, the threaded rod threaded through the connecting block, a limit rod fixedly connected between the two vertical plates, the limit rod slidingly through the connecting block, an electromagnetic plate fixedly connected to the inner top wall of the telescopic groove, a permanent magnet plate fixedly connected to the top of the sliding column, and the electromagnetic plate and the permanent magnet plate being magnetically attracted to each other.

[0013] Preferably, the first sliding rheostat includes a first resistance plate fixedly connected to the inner side wall of the detection cover, the outer wall of the first resistance plate having a first conductive sheet fixedly connected to the side wall of the pressing plate in sliding contact, and the first sliding rheostat being electrically connected to a PLC controller to form a first detection circuit.

[0014] Preferably, the second sliding rheostat includes a second conductive sheet fixedly connected to the top of the fixed frame, a second resistance plate fixedly connected to the inner side wall of the detection cover, the second conductive sheet slidingly contacting the outer wall of the second resistance plate, and the second sliding rheostat electrically connected to the PLC control to form a second detection circuit.

[0015] Preferably, the fixed end of the second electric telescopic rod is fixedly connected to two symmetrical extension plates, and the bottom end of each of the two extension plates is fixedly connected to a third electric telescopic rod. The telescopic ends of the two third electric telescopic rods are fixedly connected to photoresistor strips. The bottom end of the pressing plate is embedded with a light strip. The photoresistor strip is used to receive the light emitted by the light strip. The light strip, the photoresistor strip and the PLC controller are connected to the electrical signal to form a third detection circuit.

[0016] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0017] 1. Superior fastening effect on textiles. This is achieved through a dual-fastening structure: the main fastening component uses a miniature electric telescopic rod to drive the fastening strip to press the fabric edge, and the first motor drives the fastening rod to rotate and roll up the fabric, ensuring that the fabric is flat and not loose; the auxiliary fastening component uses the first electric telescopic rod to drive the extrusion plate to further press the fabric from above, while the magnetic attraction of the electromagnetic block and permanent magnet block and the cooperation of the plastic spring can stably maintain the fixed state during the stretching process, effectively avoiding the fabric from loosening, wrinkling or slipping, ensuring uniform force during testing, and improving the accuracy of key data.

[0018] 2. This testing equipment not only boasts comprehensive testing methods but also a high degree of automation. In terms of comprehensive testing, it achieves this through three independent yet collaborative testing loops: the first sliding rheostat, utilizing the up-and-down displacement of the pressing plate, reflects the fabric's flattening state in real time and transmits signals to the PLC controller, ensuring the fabric is in a standard state before stretching; the second sliding rheostat, utilizing the minute movement of the mounting plate caused by fabric retraction, accurately captures changes in retraction amount, providing data for tensile recovery performance evaluation; the third testing loop, through the cooperation of light strips and photoresistor strips, performs a comprehensive scan of the fabric under the drive of a second motor, automatically locating damage points without manual intervention.

[0019] 3. The high degree of automation permeates the entire inspection process: In the fixing stage, the miniature electric telescopic rod, the first motor, and the first electric telescopic rod automatically clamp, roll, and press the fabric; in the inspection stage, the second electric telescopic rod automatically controls the pressing and resetting of the pressure plate, and the magnetic action of the electromagnetic block and permanent magnet block, in conjunction with the PLC controller, automatically adjusts the tension state. The three inspection loops transmit data to the controller in real time, which automatically judges the fabric state and issues the next instruction; during damage detection, the second motor drives the inspection components to automatically complete a full scan and locate the damage point. The entire process requires no manual operation or auxiliary judgment, greatly reducing human error and significantly improving inspection efficiency and accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention from another angle;

[0024] Figure 4 This is a three-dimensional structural diagram of the fixing mechanism of the present invention;

[0025] Figure 5 This is a three-dimensional cross-sectional structural diagram of the fixing rod portion of the present invention;

[0026] Figure 6 This is a three-dimensional cross-sectional structural diagram of the second electric telescopic rod of the present invention;

[0027] Figure 7 For the present invention Figure 3 Enlarged 3D view of part A;

[0028] Figure 8 For the present invention Figure 4 Enlarged 3D view of part B.

[0029] Reference numerals: 1. Detection seat; 2. Detection cover; 3. Fixing mechanism; 31. Fixing plate; 32. Slide groove; 33. Permanent magnet; 34. Mounting plate; 35. Auxiliary fixing assembly; 351. Fixing frame; 352. First electric telescopic rod; 353. Extrusion plate; 36. Main fixing assembly; 361. Connecting plate; 362. First motor; 363. Fixing rod; 364. Slide groove; 365. Miniature electric telescopic rod; 366. Fixing strip; 37. Electromagnetic block; 38. Blocking block; 39. Plastic spring; 4. Detection mechanism; 4 1. Connecting block; 42. Second electric telescopic rod; 43. Telescopic groove; 44. Sliding column; 45. Pressing plate; 46. First sliding rheostat; 461. First resistance plate; 462. First conductive sheet; 47. Second sliding rheostat; 471. Second conductive sheet; 472. Second resistance plate; 48. Vertical plate; 49. Second motor; 410. Threaded rod; 411. Limiting rod; 412. Electromagnetic plate; 413. Permanent magnet plate; 414. Extension plate; 415. Third electric telescopic rod; 416. Photoresistor strip; 418. Light strip. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] Example: Refer to Figures 1 to 8 A textile tensile recovery performance testing device includes a testing seat 1, with a testing cover 2 fixedly connected to the top of the testing seat 1.

[0033] The fixing mechanism 3 includes two fixing plates 31 fixedly connected to the inner wall of the detection cover 2. Each fixing plate 31 has a sliding groove 32 at its top. A permanent magnet block 33 is slidably connected to the inner wall of the sliding groove 32. An installation plate 34 is fixedly connected to the top of the permanent magnet block 33. An auxiliary fixing component 35 is provided at the top of the installation plate 34. A main fixing component 36 is provided on the side wall of the installation plate 34.

[0034] The auxiliary fixing component 35 includes a fixing frame 351 fixedly connected to the top of the mounting plate 34, a first electric telescopic rod 352 fixedly connected to the bottom of the fixing frame 351, a pressing plate 353 fixedly connected to the bottom of the first electric telescopic rod 352, and a second sliding rheostat 47 jointly provided at the top of the fixing frame 351 and the inner wall of the detection cover 2.

[0035] The main fixing component 36 includes two symmetrical connecting plates 361 fixedly connected to the side wall of the mounting plate 34. A first motor 362 is fixedly connected to the outer wall of one of the connecting plates 361. A fixing rod 363 is fixedly connected to the output end of the first motor 362. A sliding groove 364 is formed on the outer wall of the fixing rod 363. Two symmetrical miniature electric telescopic rods 365 are fixedly connected to the inner wall of the sliding groove 364. A fixing strip 366 is fixedly connected to the telescopic ends of the two miniature electric telescopic rods 365. The outer wall of the fixing strip 366 is slidably connected to the inner wall of the sliding groove 362.

[0036] An electromagnetic block 37 is fixedly connected to the inner wall of the slide 32. The electromagnetic block 37 and the permanent magnet block 33 are magnetically attracted to each other. Two symmetrical blocking blocks 38 are fixedly connected to the inner wall of the slide 32. The blocking blocks 38 are in contact with the outer wall of the permanent magnet block 33. A plastic spring 39 is fixedly connected to the outer wall of the permanent magnet block 33 on the side away from the electromagnetic block 37. The other end of the plastic spring 39 is fixedly connected to the inner wall of the slide 32.

[0037] The testing mechanism 4 includes a connecting block 41 that is slidably connected to the bottom wall of the testing cover 2. A second electric telescopic rod 42 is fixedly connected to the bottom end of the connecting block 41. The telescopic end of the second electric telescopic rod 42 is provided with a telescopic groove 43. A sliding column 44 is slidably connected to the inner wall of the telescopic groove 43. A pressing plate 45 is fixedly connected to the bottom end of the sliding column 44. A first sliding rheostat 46 is provided together with the pressing plate 45 and the inner wall of the testing cover 2.

[0038] The detection mechanism 4 also includes vertical plates 48 fixedly connected to the outer walls of both sides of the detection cover 2. A second motor 49 is fixedly connected to the outer wall of one of the vertical plates 48. A threaded rod 410 is fixedly connected to the output end of the second motor 49. The threaded rod 410 is threaded through the connecting block 41 on its outer wall. A limit rod 411 is fixedly connected between the two vertical plates 48. The limit rod 411 slides through the connecting block 41. An electromagnetic plate 412 is fixedly connected to the inner top wall of the telescopic groove 43. A permanent magnet plate 413 is fixedly connected to the top of the sliding column 44. The electromagnetic plate 412 and the permanent magnet plate 413 are magnetically attracted to each other.

[0039] The first sliding rheostat 46 includes a first resistance plate 461 fixedly connected to the inner side wall of the detection cover 2, and a first conductive sheet 462 fixedly connected to the side wall of the pressing plate 45 slidingly contacting the outer wall of the first resistance plate 461. The first sliding rheostat 46 is electrically connected to a PLC controller and forms a first detection circuit.

[0040] The second sliding rheostat 47 includes a second conductive sheet 471 fixedly connected to the top of the fixed frame 351, a second resistance plate 472 fixedly connected to the inner side wall of the detection cover 2, the second conductive sheet 471 slidingly contacting the outer wall of the second resistance plate 472, and the second sliding rheostat 47 electrically connected to the PLC control to form a second detection circuit.

[0041] The fixed end of the second electric telescopic rod 42 is fixedly connected to two symmetrical extension plates 414. The bottom ends of the two extension plates 414 are fixedly connected to a third electric telescopic rod 415. The telescopic ends of the two third electric telescopic rods 415 are fixedly connected to a photoresistor strip 416. The bottom end of the pressing plate 45 is embedded with a light strip 418. The photoresistor strip 416 is used to receive the light emitted by the light strip 418. The light strip 418, the photoresistor strip 416 and the PLC controller are connected to the electrical signal to form a third detection circuit.

[0042] The working principle of this invention is as follows:

[0043] First, the fabric to be tested is passed between the fixing plate 31 and the extrusion plate 353. Then, both ends of the fabric are passed between the two fixing strips 366 and the fixing rod 363 respectively. Next, the micro electric telescopic rod 365 is activated, which pulls the fixing strips 366 to press the edge of the fabric, completing the initial clamping. Then, the first motor 362 is activated, which drives the fixing rod 363 to rotate, thereby rolling up the fabric. The fabric is rolled up by the rotation of the fixing rods 363 on both sides, making the fabric flat and not loose. Then, the first electric telescopic rod 352 in the auxiliary fixing component 35 is activated, which drives the extrusion plate 353 to move down, further pressing the fabric from above and enhancing the fixing effect.

[0044] After fixing, the second electric telescopic rod 42 is activated, causing the second electric telescopic rod 42 to move the pressing plate 45 downward, so that the pressing plate 45 presses on the fabric. After pressing for a period of time (this time is preset by the inspector), the second electric telescopic rod 42 drives the pressing plate 45 to reset. After resetting for a period of time (this time is used to allow the fabric to shrink naturally, which is also preset time), the electromagnetic plate 412 and the permanent magnet plate 413 are slowly de-energized, and the pressing plate 45 falls gently onto the fabric surface due to gravity.

[0045] Subsequently, the electromagnetic block 37 is energized, causing it to generate magnetic force that attracts the permanent magnet block 33, which in turn moves the mounting plate 34 to both sides. This causes the main fixing component 36 and the auxiliary fixing component 35 to move to both sides synchronously, flattening the fabric. During this process, the first detection circuit formed by the first sliding rheostat 46 comes into play. The pressing plate 45 moves up and down with the fabric being pulled, causing the first conductive sheet 462 to slide on the first resistance plate 461. The change in its resistance is transmitted to the PLC controller through the first detection circuit. The PLC controller judges the flattening state of the fabric based on the change in resistance. When the preset flattening resistance value is reached, the controller controls the electromagnetic block 37 to maintain the current state and stops further pulling.

[0046] After the fabric is flattened, it enters the shrinkage detection stage, and the second detection circuit formed by the second sliding rheostat 47 begins to work. At this time, the fixed frame 351 moves with the slight positional change of the mounting plate 34 caused by the fabric shrinkage, and the second conductive piece 471 at the top of the fixed frame 351 slides on the second resistance plate 472 on the inner side wall of the detection cover 2. Since the resistance value of the second resistance plate 472 is linearly distributed along the length direction, when the second conductive piece 471 slides, the overall resistance value of the second sliding rheostat 47 will change accordingly. For example, if the fabric shrinks, the mounting plate 34 will move slightly towards the center, causing the fixed frame 351 to move, changing the contact position of the second conductive piece 471 on the second resistance plate 472, resulting in a change in the resistance value in the circuit. This change in resistance value is fed back to the PLC controller in real time through the circuit. The PLC controller has a preset range of shrinkage resistance changes for the fabric under normal conditions. By comparing and analyzing the real-time received resistance change curve with the preset range, the controller accurately judges the shrinkage of the fabric after flattening.

[0047] Subsequently, the third detection circuit is activated, the light strip 418 at the bottom of the pressing plate 45 is lit, the third electric telescopic rod 415 retracts, and the photoresistor strip 416 is brought close to the fabric surface. In order to achieve comprehensive detection of the fabric, the second motor 49 is started. The second motor 49 drives the threaded rod 410 to rotate. Under the guidance of the limit rod 411, the connecting block 41 drives the second electric telescopic rod 42 and the extension plate 414 connected to it, the third electric telescopic rod 415 and the photoresistor strip 416 to move as a whole, so that the photoresistor strip 416 can fully scan the fabric surface. If there is a position where the fabric is torn, the light emitted by the light strip 418 will pass through the torn area and be received by the photoresistor strip 416. Its resistance value changes and is transmitted to the PLC controller. The controller locates the torn point according to the position of the resistance change.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the tensile recovery properties of textiles, characterized in that, Includes a detection seat (1), and a detection cover (2) is fixedly connected to the top of the detection seat (1); The fixing mechanism (3) includes two fixing plates (31) fixedly connected to the inner wall of the detection cover (2). The top of each of the two fixing plates (31) is provided with a sliding groove (32). A permanent magnet block (33) is slidably connected to the inner wall of the sliding groove (32). An installation plate (34) is fixedly connected to the top of the permanent magnet block (33). An auxiliary fixing component (35) is provided at the top of the installation plate (34). A main fixing component (36) is provided on the side wall of the installation plate (34). The detection mechanism (4) includes a connecting block (41) that is slidably connected to the bottom wall of the detection cover (2). The bottom end of the connecting block (41) is fixedly connected to a second electric telescopic rod (42). The telescopic end of the second electric telescopic rod (42) is provided with a telescopic groove (43). The inner wall of the telescopic groove (43) is slidably connected to a sliding column (44). The bottom end of the sliding column (44) is fixedly connected to a pressing plate (45). The pressing plate (45) and the inner wall of the detection cover (2) are jointly provided with a first sliding rheostat (46). The auxiliary fixing component (35) includes a fixing frame (351) fixedly connected to the top of the mounting plate (34), a first electric telescopic rod (352) fixedly connected to the bottom of the fixing frame (351), a pressing plate (353) fixedly connected to the bottom of the first electric telescopic rod (352), and a second sliding rheostat (47) provided together with the top of the fixing frame (351) and the inner wall of the detection cover (2). The detection mechanism (4) also includes vertical plates (48) fixedly connected to the outer walls of both sides of the detection cover (2). A second motor (49) is fixedly connected to the outer wall of one of the vertical plates (48). A threaded rod (410) is fixedly connected to the output end of the second motor (49). The threaded rod (410) is threaded through the connecting block (41) on its outer wall. A limit rod (411) is fixedly connected between the two vertical plates (48). The limit rod (411) slides through the connecting block (41). An electromagnetic plate (412) is fixedly connected to the inner top wall of the telescopic groove (43). A permanent magnet plate (413) is fixedly connected to the top of the sliding column (44). The electromagnetic plate (412) and the permanent magnet plate (413) are magnetically attracted to each other. The first sliding rheostat (46) includes a first resistance plate (461) fixedly connected to the inner side wall of the detection cover (2), and the outer wall of the first resistance plate (461) has a first conductive sheet (462) fixedly connected to the side wall of the pressing plate (45). The first sliding rheostat (46) is electrically connected to a PLC controller and forms a first detection circuit. The second sliding rheostat (47) includes a second conductive sheet (471) fixedly connected to the top of the fixed frame (351), a second resistance plate (472) fixedly connected to the inner side wall of the detection cover (2), the second conductive sheet (471) slidingly contacting the outer wall of the second resistance plate (472), and the second sliding rheostat (47) electrically connected to the PLC control to form a second detection circuit.

2. The textile tensile recovery performance testing equipment according to claim 1, characterized in that, The main fixing component (36) includes two symmetrical connecting plates (361) fixedly connected to the side wall of the mounting plate (34). A first motor (362) is fixedly connected to the outer wall of one of the connecting plates (361). A fixing rod (363) is fixedly connected to the output end of the first motor (362). A sliding groove (364) is provided on the outer wall of the fixing rod (363). Two symmetrical miniature electric telescopic rods (365) are fixedly connected to the inner wall of the sliding groove (364). A fixing strip (366) is fixedly connected to the telescopic end of the two miniature electric telescopic rods (365). The outer wall of the fixing strip (366) is slidably connected to the inner wall of the sliding groove (32).

3. The textile tensile recovery performance testing equipment according to claim 2, characterized in that, An electromagnetic block (37) is fixedly connected to the inner wall of the slide (32). The electromagnetic block (37) is magnetically attracted to the permanent magnet block (33). Two symmetrical blocking blocks (38) are fixedly connected to the inner wall of the slide (32). The blocking blocks (38) are in contact with the outer wall of the permanent magnet block (33). A plastic spring (39) is fixedly connected to the outer wall of the permanent magnet block (33) away from the electromagnetic block (37). The other end of the plastic spring (39) is fixedly connected to the inner wall of the slide (32).

4. The textile tensile recovery performance testing equipment according to claim 3, characterized in that, The fixed end of the second electric telescopic rod (42) is fixedly connected to two symmetrical extension plates (414). The bottom ends of the two extension plates (414) are fixedly connected to a third electric telescopic rod (415). The telescopic ends of the two third electric telescopic rods (415) are fixedly connected to a photoresistor strip (416). The bottom end of the pressing plate (45) is embedded with a light strip (418). The photoresistor strip (416) is used to receive the light emitted by the light strip (418). The light strip (418), the photoresistor strip (416) are connected to the PLC controller by electrical signals and form a third detection circuit.

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