Length measuring device and measuring process for nylon production

Abstract

The invention relates to the technical field of nylon production, and discloses a length measuring device for nylon production and a measuring technology.The length measuring device comprises a working base table, a placement arc-shaped block is fixedly connected to the top end of the working base table, a nylon pipe is placed at the top end of the placement arc-shaped block, and a fixing mechanism is movably connected to the interior of the working base table; perpendicularity detection mechanisms are fixedly connected to the side faces, close to each other, of the fixing mechanisms, and laser emitters and light receiving plates are fixedly connected to the side faces, close to each other, of the two perpendicularity detection mechanisms in sequence; according to the invention, a nylon tube is placed above a placement arc-shaped block, a moving plate drives a connecting plate and a verticality detection mechanism to move synchronously and oppositely when moving, conical blocks enter the nylon tube when moving, the two conical blocks lift the nylon tube, and two sides of the nylon tube are limited by supporting circular plates. At the moment, the light receiving plate receives the light generated by the laser transmitter in the nylon tube, the length is automatically generated, the nylon tube can shield the external light, and the length measurement precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of nylon production, and more particularly to a length measuring device and a measuring process for nylon production. Background Art

[0002] Nylon, also known as polyamide fiber, is a general term for thermoplastic resins containing repeating amide groups in the molecular chain. It is the first synthetic fiber to appear in the world and is also one of the most widely used materials in the world. Its name is determined by the specific number of carbon atoms in the synthetic monomer. Nylon belongs to a type of polymer material with relatively strong polarity, and hydrogen bonds can be formed between molecules. Therefore, it has a relatively high melting temperature, a narrow melting temperature range, an obvious melting point, and excellent mechanical properties, hydrophilicity, lubricity, wear resistance, corrosion resistance, and is easy to process and form, etc., and is widely used in all walks of life.

[0003] When nylon is used as a product, due to its good oil resistance, strong barrier property, non-toxic and odorless, it can be used as a packaging material to store oil products for a long time. There are a large number of hydrogen bonds with extremely strong forces between nylon molecules, making it have good mechanical properties, wear resistance, and corrosion resistance. It is a good 3D printing material. In order to ensure the use performance of nylon products, measurement is required after production; For example, after the production of nylon pipes, it is necessary to measure their lengths. Nowadays, when measuring the length of nylon pipes, it is generally measured manually. This measurement method is not accurate enough. And nowadays, when measuring, it is generally measured by a ruler or a laser. The accuracy of ruler measurement is reduced, and laser measurement is easily affected by the external environment; Nylon pipes not only need to measure their lengths, but also need to measure the integrity of their surfaces or the perpendicularity of the pipes themselves. However, the current measuring devices cannot measure nylon pipes more comprehensively. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a length measuring device and a measuring process for nylon production to solve the technical problems proposed in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A length measuring device for nylon production, including a working base, a placing arc block is fixedly connected to the top end of the working base, a nylon pipe is placed on the top end of the placing arc block, a fixing mechanism is movably connected inside the working base, perpendicularity detection mechanisms are fixedly connected to the mutually adjacent sides of the fixing mechanism, a laser emitter and a light receiving plate are fixedly connected in sequence to the mutually adjacent sides of the two perpendicularity detection mechanisms, an intelligent control end is fixedly connected to one side of the top end of the working base, and a surface detection mechanism is fixedly connected to the side of the working base; The fixing mechanism includes an output motor capable of providing power. A rotating shaft is fixedly connected to the side of the output motor. Thread grooves that are mirror-symmetrical are provided at both ends of the rotating shaft. Moving plates are threadedly connected to the two thread grooves of the rotating shaft. Limiting inner cylinders are fixedly connected to the sides of the two moving plates that are close to each other. Limiting outer cylinders are sleeved on the sides of the limiting inner cylinders away from the moving plates. Buffer springs are sleeved on the sides of the limiting inner cylinders. Connecting plates are fixedly connected to the sides of the limiting outer cylinders away from the limiting inner cylinders.

[0006] In a preferred embodiment, the laser emitter and the light receiving plate are on the same axis, and the laser emitted by the laser emitter will be received by the light receiving plate. The diameters of the laser emitter and the light receiving plate are the same, and the diameters of the laser emitter and the light receiving plate are one-third of the inner diameter length of the nylon tube.

[0007] In a preferred embodiment, the top end of the connecting plate is fixedly connected to the bottom end of the inner support circular plate of the perpendicularity detection mechanism. A through hole with a diameter twice that of the rotating shaft is provided inside the connecting plate. The side of the rotating shaft does not come into contact with the inside of the limiting inner cylinder.

[0008] In a preferred embodiment, the perpendicularity detection mechanism includes a support circular plate fixedly connected to both connecting plates inside the fixing mechanism. Connecting circular plates are fixedly connected to the sides of the two support circular plates that are close to each other. Cone blocks are fixedly connected to the sides of the two connecting circular plates away from the support circular plates. A laser emitter is fixedly connected to the side of one cone block away from the connecting circular plate. A light receiving plate is fixedly connected to the side of the other cone block away from the connecting circular plate.

[0009] In a preferred embodiment, four installation grooves are provided inside the connecting circular plate. Pressure sensors are fixedly connected to the four installation grooves of the connecting circular plate. The four installation grooves are equally angularly distributed on the side of the connecting circular plate. Support springs are fixedly connected to the outer sides of the pressure sensors away from the connecting circular plate. Steel balls are fixedly connected to the sides of the support springs away from the pressure sensors.

[0010] In a preferred embodiment, the surface detection mechanism includes a servo motor capable of providing power. An output bevel gear is fixedly connected to the side of the servo motor. Driving bevel gears are fixedly connected to both sides of the output bevel gear away from the servo motor. Threaded rods are fixedly connected to the sides of the two driving bevel gears that are away from each other. Reciprocating plates are threadedly connected to the sides of the threaded rods. Connecting rods are fixedly connected to the top ends of the reciprocating plates. Detection rings are fixedly connected to the sides of the connecting rods. The detection rings are located on the sides of the connecting circular plates inside the perpendicularity detection mechanism, and the inner diameter of the detection rings is larger than the outer diameter of the nylon tube.

[0011] In a preferred embodiment, a smart camera is fixedly connected inside the detection ring. The number of the smart cameras is six, and the six smart cameras are equally angularly distributed inside the detection ring. The two threaded rods are mirror-symmetrical about the center of the servo motor. The bottom end of the reciprocating plate is movably connected with a protection box.

[0012] The technical effects and advantages of the present invention: In the present invention, the nylon tube is placed above the placing arc-shaped block. The output motor is started and drives the moving plate to move through the rotating shaft. When the moving plate moves, it drives the connecting plate to move. The two connecting plates drive the perpendicularity detection mechanism to move synchronously towards each other. When the conical blocks in the perpendicularity detection mechanism move, they enter the nylon tube. The two conical blocks lift the nylon tube. The two sides of the nylon tube are restricted by the supporting circular plates. At this time, the light receiving plate receives the light emitted by the laser emitter inside the nylon tube and automatically generates a length. The nylon tube can block external light to ensure the length measurement accuracy. After the two connecting circular plates of the present invention lift the nylon tube, at this time, the two connecting circular plates enter the nylon tube, and both sides of the nylon tube are in contact with the supporting circular plates. The supporting circular plates can fix the nylon tube. When the connecting circular plates enter the inside of the nylon tube, the four steel balls inside the connecting circular plates are in contact with the inner wall of the nylon tube, and under the extrusion inside the nylon tube, they move towards the inside of the connecting circular plate and apply pressure to the pressure sensor through the supporting spring. By detecting the pressure difference between the pressure sensors at the same position on both sides, the overall vertical degree of the nylon tube is judged. When the perpendicularity detection mechanism of the present invention fixes the nylon tube, the servo motor is started and drives the output bevel gear to rotate. When the output bevel gear rotates, it drives the two threaded rods to rotate through the two transmission bevel gears. When the two threaded rods rotate, the two detection rings move closer to or away from each other. When the two detection rings move closer to each other on the side of the nylon tube, the smart camera can scan the surface of the nylon tube to judge the surface condition of the nylon tube. After the two detection rings move away from the nylon tube, the nylon tube can be removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the structure of the present invention when no nylon tube is placed.

[0015] Figure 3 It is a schematic diagram of the internal structure of the working base of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the fixing mechanism of the present invention.

[0017] Figure 5 It is an exploded schematic diagram of the fixing mechanism of the present invention.

[0018] Figure 6 This is a schematic structural diagram of the perpendicularity detection mechanism of the present invention.

[0019] Figure 7 This is an exploded structural diagram of the perpendicularity detection mechanism of the present invention.

[0020] Figure 8 This is an exploded structural diagram of the surface detection mechanism of the present invention.

[0021] The reference numerals are: 1, working base; 2, placing arc block; 3, nylon tube; 4, fixing mechanism; 401, output motor; 402, rotating shaft; 403, moving plate; 404, limiting inner cylinder; 405, limiting outer cylinder; 406, buffer spring; 407, connecting plate; 5, perpendicularity detection mechanism; 501, supporting circular plate; 502, connecting circular plate; 503, conical block; 504, pressure sensor; 505, supporting spring; 506, steel ball; 6, surface detection mechanism; 601, servo motor; 602, output bevel gear; 603, driving bevel gear; 604, threaded rod; 605, reciprocating plate; 606, connecting rod; 607, detection ring; 608, intelligent camera; 609, protection box; 7, intelligent control end; 8, laser emitter; 9, light receiving plate. Detailed implementation manners

[0022] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples, and a length measuring device and measuring process for nylon production related to the present invention are not limited to the various structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0023] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 6, the present invention provides a length measuring device for nylon production, including a working base 1. A placing arc block 2 is fixedly connected to the top of the working base 1. A nylon tube 3 is placed on the top of the placing arc block 2. A fixing mechanism 4 is movably connected inside the working base 1. Verticality detection mechanisms 5 are fixedly connected to the mutually approaching sides of the fixing mechanism 4. A laser emitter 8 and a light receiving plate 9 are sequentially fixedly connected to the mutually approaching sides of the two verticality detection mechanisms 5. An intelligent control terminal 7 is fixedly connected to one side of the top of the working base 1. A surface detection mechanism 6 is fixedly connected to the side of the working base 1. The laser emitter 8 and the light receiving plate 9 are on the same axis, and the laser emitted by the laser emitter 8 will be received by the light receiving plate 9. The diameters of the laser emitter 8 and the light receiving plate 9 are the same, and the diameters of the laser emitter 8 and the light receiving plate 9 are one-third of the inner diameter length of the nylon tube 3.

[0024] In the embodiment of the present application, when the present application is measuring, the laser emitter 8 and the light receiving plate 9 will enter the nylon tube 3. When the laser emitter 8 and the light receiving plate 9 enter the inside of the nylon tube 3, at this time, the nylon tube 3 will automatically block the external light. When the laser emitter 8 inside the nylon tube 3 emits laser to the surface of the light receiving plate 9, it will not be affected by the environment, thereby ensuring the accuracy of the present application when measuring the length. It should be noted that when detecting through the laser emitter 8 and the light receiving plate 9, the values detected by the laser emitter 8 and the light receiving plate 9 will add the distance between the two support circular plates 501 and the laser emitter 8 and the light receiving plate 9. Therefore, the distance detected by the laser emitter 8 and the light receiving plate 9 is the length between the two support circular plates 501, that is, the length of the nylon tube 3.

[0025] Refer to Figure 3 , Figure 4 and Figure 5 , the fixing mechanism 4 includes an output motor 401 that can provide power. A rotating shaft 402 is fixedly connected to the side of the output motor 401. Thread grooves that are mirror-symmetrical are opened at both ends of the rotating shaft 402. Two moving plates 403 are threadedly connected to the two thread grooves of the rotating shaft 402. Limiting inner cylinders 404 are fixedly connected to the mutually approaching sides of the two moving plates 403. Limiting outer cylinders 405 are sleeved on the sides of the limiting inner cylinders 404 that are away from the moving plates 403. Buffer springs 406 are sleeved on the sides of the limiting inner cylinders 404. A connecting plate 407 is fixedly connected to the side of the limiting outer cylinder 405 that is away from the limiting inner cylinder 404. The top of the connecting plate 407 is fixedly connected to the bottom of the support circular plate 501 inside the verticality detection mechanism 5. A through hole with a diameter twice that of the rotating shaft 402 is opened inside the connecting plate 407. The side of the rotating shaft 402 does not come into contact with the inside of the limiting inner cylinder 404.

[0026] In the embodiment of the present application, when the output motor 401 drives the rotating shaft 402 to rotate, the thread grooves on both sides of the rotating shaft 402 are mirror-symmetrical, so that the moving plates 403 on both sides move closer to or away from each other. When the moving plates 403 move closer to each other, the moving plates 403 drive the limiting inner cylinder 404 and the buffer spring 406 to move. When the buffer spring 406 moves, it will drive the limiting outer cylinder 405 to move, and the limiting outer cylinder 405 drives the connecting plate 407 to move. Moreover, when the buffer spring 406 drives the limiting outer cylinder 405 to move, the buffer spring 406 will be compressed. When the connecting plate 407 drives the supporting circular plate 501 to move, the supporting circular plate 501 will contact the side surface of the nylon tube 3. Therefore, the position of the supporting circular plate 501 will be fixed by the nylon tube 3. At this time, when the moving plate 403 continues to move, the buffer spring 406 will be compressed again, and the limiting inner cylinder 404 will move inside the limiting outer cylinder 405. Therefore, when the supporting circular plate 501 clamps the nylon tube 3, it is clamped by the elastic force of the compression of the buffer spring 406. Therefore, it can avoid the problem that when directly clamping the nylon tube 3 by moving, the nylon tube 3 is relatively long, so that the contact between the moving plate 403 and the nylon tube 3 is still in a moving state, and it is easy to be damaged at this time. The limiting inner cylinder 404 does not contact the rotating shaft 402, and the connecting plate 407 is provided with a through hole to avoid interference caused by the rotation of the rotating shaft 402 contacting other structures.

[0027] Referring to Figure 6 With Figure 7 , the perpendicularity detection mechanism 5 includes a supporting circular plate 501 fixedly connected to both connecting plates 407 in the fixing mechanism 4. On the side surfaces of the two supporting circular plates 501 close to each other, connecting circular plates 502 are fixedly connected. On the side surfaces of the two connecting circular plates 502 far from the supporting circular plate 501, conical blocks 503 are fixedly connected. On the side surface of one conical block 503 far from the connecting circular plate 502, a laser emitter 8 is fixedly connected. On the side surface of the other conical block 503 far from the connecting circular plate 502, a light receiving plate 9 is fixedly connected. Four installation grooves are opened inside the connecting circular plate 502. Pressure sensors 504 are fixedly connected in the four installation grooves of the connecting circular plate 502. The four installation grooves are equally angularly distributed on the side surface of the connecting circular plate 502. On the outer side of the pressure sensor 504 far from the connecting circular plate 502, a supporting spring 505 is fixedly connected. On the side surface of the supporting spring 505 far from the pressure sensor 504, a steel ball 506 is fixedly connected.

[0028] In the embodiment of the present application, when the connecting circular plate 502 enters the interiors on both sides of the nylon tube 3, if the verticality of the nylon tube 3 itself is relatively large, that is, when the nylon tube 3 cannot ensure a relatively vertical state, the nylon tube 3 will be inclined in the horizontal and vertical directions, and the inclination directions on both sides of the nylon tube 3 are opposite. For example, when the verticality of the nylon tube 3 in the vertical direction is relatively large, at this time, one side of the nylon tube 3 is higher and the other side is lower. When the connecting circular plate 502 enters the interior of the higher-side nylon tube 3, the pressure value of the pressure sensor 504 below the inner side of the connecting circular plate 502 increases less, while when entering the lower-side connecting circular plate 502, the pressure value of the pressure sensor 504 below the inner side increases more. At this time, there is a pressure difference between the pressure sensors 504 at the corresponding positions, and it can be determined that the verticality of the nylon tube 3 is relatively large, and the nylon tube 3 itself is not vertical enough and has a certain inclination. In addition, it should be noted that when the nylon tube 3 is at the standard verticality and the connecting circular plate 502 is located inside the nylon tube 3, half of the steel ball 506 located outside the connecting circular plate 502 is pressed into the interior of the connecting circular plate 502. Therefore, the nylon tube 3 can move on the outer side of the connecting circular plate 502, and when the nylon tube 3 presses the steel ball 506 into the interior of the connecting circular plate 502, it will not press the steel ball 506 completely into the connecting circular plate 502, so as to avoid the situation where when the connecting circular plate 502 is completely pressed into the interior of the connecting circular plate 502, the pressure values of the pressure sensors 504 at the corresponding positions inside the two connecting circular plates 502 are the same. And when the nylon tube 3 is measured at the standard verticality, the pressure value of the lower pressure sensor 504 is just smaller than that of the upper pressure sensor 504. Therefore, the nylon tube 3 has its own weight, but in this application, the same positions on both sides are compared, that is, the values of the pressure sensors 504 below the inner sides of the two connecting circular plates 502 are compared to avoid the influence of the self-weight and thus ensure the accuracy of the detection.

[0029] Referring to Figure 1 With Figure 8 , the surface detection mechanism 6 includes a servo motor 601 that can provide power. A output bevel gear 602 is fixedly connected to the side of the servo motor 601. Transmission bevel gears 603 are fixedly connected to both sides of the output bevel gear 602 away from the servo motor 601. Threaded rods 604 are fixedly connected to the sides of the two transmission bevel gears 603 away from each other. Reciprocating plates 605 are threadedly connected to the sides of the threaded rods 604. A connecting rod 606 is fixedly connected to the top of the reciprocating plate 605. A detection ring 607 is fixedly connected to the side of the connecting rod 606. The detection ring 607 is located on the side of the connecting circular plate 502 inside the verticality detection mechanism 5, and the inner diameter of the detection ring 607 is larger than the outer diameter of the nylon tube 3. An intelligent camera 608 is fixedly connected to the inside of the detection ring 607. The number of the intelligent cameras 608 is six, and the six intelligent cameras 608 are equally angularly distributed inside the detection ring 607. The two threaded rods 604 are mirror-symmetrical about the center of the servo motor 601. The bottom end of the reciprocating plate 605 is movably connected to a protection box 609.

[0030] In the embodiment of the present application, the two threaded rods 604 are mirror-symmetrical about the center of the servo motor 601, and the reciprocating plate 605, the connecting rod 606, and the detection ring 607 connected to the threaded rod 604 are all mirror-symmetrical. Moreover, the inner diameter of the detection ring 607 is greater than the outer diameter of the nylon tube 3, and the detection ring 607 will not contact the nylon tube 3 when moving on the side of the nylon tube 3. When the nylon tube 3 is not being detected, it will be placed on the placing arc-shaped block 2. During detection, the perpendicularity detection mechanism 5 will cause the nylon tube 3 to move upward and contact the connecting circular plate 502 and the steel ball 506. At this time, the circle of the detection ring 607 coincides with the circle of the nylon tube 3, ensuring that the detection ring 607 can pass smoothly through the nylon tube 3 when moving. The number of intelligent cameras 608 is six, enabling the intelligent cameras 608 to detect all positions on the outer surface of the nylon tube 3. In addition, it should be noted that the maximum inward movement stroke of the two detection rings 607 is such that the two detection rings 607 can contact each other without being damaged, ensuring that the entire outer surface of the nylon tube 3 can be measured.

[0031] The working principle of the present invention: During measurement, the nylon tube 3 is placed above the placing arc-shaped block 2. After the nylon tube 3 is placed, the output motor 401 starts. When the output motor 401 starts, it drives the rotating shaft 402 to rotate. When the rotating shaft 402 rotates, the moving plates 403 on both sides of it move synchronously towards each other. When the moving plates 403 move, they drive the connecting plate 407 through the buffer springs 406 and the limiting outer cylinders 405. When the connecting plate 407 moves, it drives the supporting circular plate 501, the connecting circular plate 502, and the conical block 503 to move. When the conical block 503 moves to the inside of the nylon tube 3, the nylon tube 3 moves upward along with the conical block 503. The nylon tube 3 passes through the connecting circular plate 502 and presses the steel ball 506 on the side of the conical block 503 into the inside of the connecting circular plate 502. Finally, the nylon tube 3 contacts the supporting circular plate 501. When the nylon tube 3 contacts the supporting circular plate 501, the moving plate 403 will move again. At this time, the positions of the supporting circular plate 501 and the connecting plate 407 are fixed by the nylon tube 3. When the moving plate 403 moves, it compresses the buffer spring 406, and the supporting circular plate 501 presses the two sides of the nylon tube 3 inward, thereby fixing the nylon tube 3. When the nylon tube 3 is fixed, the laser emitter 8 inside the nylon tube 3 emits laser light, and the light receiving plate 9 receives the laser light emitted by the laser emitter 8, thereby measuring the length of the nylon tube 3. When the nylon tube 3 presses the steel ball 506 on the side of the conical block 503 into the inside of the connecting circular plate 502, when the nylon tube 3 is not in a vertical state, the nylon tube 3 will form a certain deviation in the vertical or horizontal direction. At this time, the values detected by the pressure sensors 504 at the corresponding positions on both sides of the nylon tube 3 have a difference, and the difference is inversely proportional to the perpendicularity of the nylon tube 3. When the output motor 401 starts, the servo motor 601 will start synchronously. When the servo motor 601 starts, it drives two transmission bevel gears 603 to rotate through the output bevel gear 602. When the two transmission bevel gears 603 rotate, the two reciprocating plates 605 drive the detection ring 607 to move through the connecting rod 606. The two detection rings 607 move closer to or away from each other. When the two detection rings 607 move closer to each other, the two detection rings 607 move from both sides of the nylon tube 3 to the center of the nylon tube 3, driving the intelligent camera 608 inside the detection ring 607 to move, and detecting the side of the nylon tube 3. After the detection rings 607 move away from each other and leave the nylon tube 3, the output motor 401 moves in the reverse direction. At this time, the nylon tube 3 leaves the support circular plate 501, the measured nylon tube 3 is removed, and a new nylon tube 3 is placed for measurement; When the servo motor 601 and the output motor 401 start synchronously, the intelligent camera 608 is controlled to move at the same speed as the connecting plate 407. When the nylon tube 3 contacts the steel ball 506 and the pressure sensor 504 is triggered for pressure detection, the servo motor 601 controls the intelligent camera 608 to increase the moving speed. After the two intelligent cameras 608 move towards each other to the maximum stroke, the servo motor 601 drives the output bevel gear 602 to reverse, so that the two intelligent cameras 608 quickly move away from each other to the acceleration starting position. When the output motor 401 controls the rotating shaft 402 to reverse and the connecting plate 407 and the perpendicularity detection mechanism 5 are reset, the servo motor 601 controls the intelligent camera 608 to reset at the same speed as the connecting plate 407.

[0032] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A length measuring device for nylon production, comprising a working base table (1), characterized in that: A placing arc-shaped block (2) is fixedly connected to the top end of the working base table (1). A nylon tube (3) is placed on the top end of the placing arc-shaped block (2). A fixing mechanism (4) is movably connected inside the working base table (1). Verticality detection mechanisms (5) are fixedly connected to the mutually approaching sides of the fixing mechanism (4). A laser emitter (8) and a light receiving plate (9) are fixedly connected in sequence to the mutually approaching sides of the two verticality detection mechanisms (5). An intelligent control terminal (7) is fixedly connected to one side of the top end of the working base table (1). A surface detection mechanism (6) is fixedly connected to the side of the working base table (1). The fixing mechanism (4) includes an output motor (401) capable of providing power. A rotating shaft (402) is fixedly connected to the side of the output motor (401). Thread grooves that are mirror-symmetrical are opened at both ends of the rotating shaft (402). Two moving plates (403) are threadedly connected to the two thread grooves of the rotating shaft (402). Limiting inner cylinders (404) are fixedly connected to the mutually approaching sides of the two moving plates (403). Limiting outer cylinders (405) are sleeved on the sides of the limiting inner cylinders (404) away from the moving plates (403). Buffer springs (406) are sleeved on the sides of the limiting inner cylinders (404). Connecting plates (407) are fixedly connected to the sides of the limiting outer cylinders (405) away from the limiting inner cylinders (404).

2. The length measuring device for nylon production according to claim 1, wherein: The laser emitter (8) and the light receiving plate (9) are on the same axis, and the laser emitted by the laser emitter (8) will be received by the light receiving plate (9). The laser emitter (8) and the light receiving plate (9) have the same diameter, and the diameter of the laser emitter (8) and the light receiving plate (9) is one-third of the inner diameter length of the nylon tube (3).

3. A length measuring device for nylon production according to claim 1, characterized in that: The top end of the connecting plate (407) is fixedly connected to the bottom end of the inner support circular plate (501) in the verticality detection mechanism (5). A through hole with a diameter twice that of the rotating shaft (402) is opened inside the connecting plate (407). The side of the rotating shaft (402) does not contact the inside of the limiting inner cylinder (404).

4. A length measuring device for nylon production according to claim 1, characterized in that: The verticality detection mechanism (5) includes support circular plates (501) fixedly connected to the two connecting plates (407) inside the fixing mechanism (4). Connecting circular plates (502) are fixedly connected to the mutually approaching sides of the two support circular plates (501). Cone blocks (503) are fixedly connected to the sides of the two connecting circular plates (502) away from the support circular plates (501). A laser emitter (8) is fixedly connected to the side of one cone block (503) away from the connecting circular plate (502). A light receiving plate (9) is fixedly connected to the side of the other cone block (503) away from the connecting circular plate (502).

5. The length measuring device for nylon production according to claim 4, characterized in that: Four mounting grooves are formed inside the connecting circular plate (502), and pressure sensors (504) are fixedly connected to the four mounting grooves of the connecting circular plate (502). The four mounting grooves are equiangularly distributed on the side surface of the connecting circular plate (502). A support spring (505) is fixedly connected to the outer side of the pressure sensor (504) away from the connecting circular plate (502), and a steel ball (506) is fixedly connected to the side surface of the support spring (505) away from the pressure sensor (504).

6. The length measuring device for nylon production according to claim 1, characterized in that: The surface detection mechanism (6) includes a servo motor (601) that can provide power. An output bevel gear (602) is fixedly connected to the side surface of the servo motor (601). Transmission bevel gears (603) are fixedly connected to both sides of the output bevel gear (602) away from the servo motor (601). Threaded rods (604) are fixedly connected to the side surfaces of the two transmission bevel gears (603) away from each other. Reciprocating plates (605) are threadedly connected to the side surfaces of the threaded rods (604). A connecting rod (606) is fixedly connected to the top end of the reciprocating plate (605). A detection ring (607) is fixedly connected to the side surface of the connecting rod (606). The detection ring (607) is located on the side surface of the connecting circular plate (502) inside the perpendicularity detection mechanism (5), and the inner diameter of the detection ring (607) is larger than the outer diameter of the nylon tube (3).

7. A length measuring device for nylon production according to claim 6, characterized in that: An intelligent camera (608) is fixedly connected to the inside of the detection ring (607). The number of the intelligent cameras (608) is six, and the six intelligent cameras (608) are equiangularly distributed inside the detection ring (607). The two threaded rods (604) are mirror-symmetrical about the center of the servo motor (601). The bottom end of the reciprocating plate (605) is movably connected to a protection box (609).

8. A measurement process for nylon production, which applies a length measurement device for nylon production as described in any one of claims 1-7, is characterized in that, Including the following steps: Step S1: During measurement, place the nylon tube (3) above the placing arc-shaped block (2). After the nylon tube (3) is placed, the output motor (401) is started. When the output motor (401) is started, it drives the rotating shaft (402) to rotate. When the rotating shaft (402) rotates, the moving plates (403) on both sides of it move synchronously towards each other. When the moving plates (403) move, they drive the connecting plate (407) to move through the buffer spring (406) and the limiting outer cylinder (405). When the connecting plate (407) moves, it drives the support circular plate (501), the connecting circular plate (502), and the conical block (503) to move. When the conical block (503) moves to the inside of the nylon tube (3), the nylon tube (3) moves upward along with the conical block (503). The nylon tube (3) passes through the connecting circular plate (502) and presses the steel ball (506) on the side of the conical block (503) towards the inside of the connecting circular plate (502). Finally, the nylon tube (3) contacts the support circular plate (501). Step S2: When the nylon tube (3) contacts the support circular plate (501), the moving plate (403) moves again. At this time, the positions of the support circular plate (501) and the connecting plate (407) are fixed by the nylon tube (3). When the moving plate (403) moves, it compresses the buffer spring (406), and the support circular plate (501) presses the two sides of the nylon tube (3) inward, thereby fixing the nylon tube (3). Step S3: When the nylon tube (3) is fixed, the laser emitter (8) in the nylon tube (3) emits laser light, and the light receiving plate (9) receives the laser light emitted by the laser emitter (8), thereby measuring the length of the nylon tube (3). When the nylon tube (3) presses the steel balls (506) on the side of the conical block (503) towards the inside of the connecting circular plate (502), when the nylon tube (3) is not in a vertical state, the nylon tube (3) will form a certain deviation in the vertical or horizontal direction. At this time, there is a difference in the values detected by the pressure sensors (504) at the corresponding positions on both sides of the nylon tube (3), and the difference is inversely proportional to the verticality of the nylon tube (3). Step S1: When the output motor (401) starts, the servo motor (601) starts synchronously. When the servo motor (601) starts, it drives two transmission bevel gears (603) to rotate through the output bevel gear (602). When the two transmission bevel gears (603) rotate, the two reciprocating plates (605) drive the detection ring (607) to move through the connecting rod (606). The two detection rings (607) move closer to or away from each other. When the two detection rings (607) move closer to each other, the two detection rings (607) move from both sides of the nylon tube (3) to the center of the nylon tube (3), driving the intelligent camera (608) inside the detection ring (607) to move, and detecting the side of the nylon tube (3). After the detection rings (607) move away from each other and leave the nylon tube (3), the output motor (401) moves in the reverse direction. At this time, the nylon tube (3) leaves the support circular plate (501), the measured nylon tube (3) is taken off, and a new nylon tube (3) is placed for measurement.

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