Recycled plastic particle transmittance detection device and method

Abstract

The invention relates to the technical field of plastic detection, in particular to a recycled plastic particle light transmittance detection device and method.The recycled plastic particle light transmittance detection device comprises a light transmittance tester body, a light source probe and a receiving probe; the device further comprises a detection assembly. The detection assembly comprises a detection table, two supporting columns, a guide rail, two sliding blocks, two clamping mechanisms, a driving mechanism, an adjusting mechanism, two restraining strips and a supporting frame. During use, the plastic particles are made into plastic sheets; the distance between the two restraining strips is adjusted through the adjusting mechanism, so that the distance is matched with the size of the plastic sheet; a plastic sheet is placed between the two restraining strips, falls down along the two restraining strips and is supported by the supporting frame; the driving mechanism drives the two sliding blocks to be close to each other, the light source probe and the receiving probe are driven to be close to each other, and the plastic sheet is clamped in the middle; and the light transmittance value of the plastic sheet is read from the light transmittance tester main body.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic detection, and particularly to a device and method for detecting the light transmittance of recycled plastic particles. Background Art

[0002] Recycled plastic particles are granular materials made by processing waste plastics through processes such as recycling, sorting, cleaning, melting, and pelletizing, and can replace some virgin plastics for the production of new plastic products. Light transmittance refers to the ability of a material to transmit light and is one of the important indicators for measuring transparent or translucent materials. The light transmittance detection of plastic particles is mainly to evaluate their optical properties.

[0003] In the prior art, when detecting the light transmittance of recycled plastic particles, mainly a light transmittance tester is used. Generally, the plastic particles are first made into plastic sheets with uniform thickness, and then the light source probe and the receiving probe are manually placed on the front and back sides of the plastic sheet respectively, and the plastic sheet is clamped. The light source probe is responsible for emitting light, and the receiving probe is responsible for capturing the light passing through the plastic sheet and measuring its light intensity, so as to calculate the light transmittance of the plastic sheet.

[0004] However, when using the above method, it is necessary to manually clamp the light source probe and the receiving probe to the plastic sheet with both hands for light transmittance detection, and the detection operation is relatively inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for detecting the light transmittance of recycled plastic particles, which can more conveniently complete the light transmittance detection of plastic particles.

[0006] To achieve the above purpose, in the first aspect, the present invention provides a device for detecting the light transmittance of recycled plastic particles, including a light transmittance tester main body, a light source probe, and a receiving probe; the light source probe is electrically connected to the light transmittance tester main body; the receiving probe is electrically connected to the light transmittance tester main body;

[0007] It further includes a detection component;

[0008] The detection component includes a detection table, two support columns, a guide rail, two sliders, two clamping mechanisms, a driving mechanism, an adjusting mechanism, two constraint bars, and a support frame;

[0009] The two pillars are respectively fixedly arranged on the top of the detection table; the guide rail is fixedly arranged on the tops of the two pillars; the two sliders are respectively slidably arranged in the guide rail; the two clamping mechanisms are respectively fixedly arranged on one side of the two sliders and are respectively used for clamping and installing the light source probe and the receiving probe; the driving mechanism is arranged on the guide rail and is used for driving the two sliders to slide synchronously; the adjusting mechanism is arranged on the top of the detection table; the two restraint bars are respectively arranged on the adjusting mechanism, and the adjusting mechanism is used for adjusting the distance between the two restraint bars; the support frame is arranged on the detection table; the transmittance tester main body is fixedly arranged on the top of the guide rail.

[0010] Wherein, the clamping mechanism includes a connecting block, an installation cylinder and a tightening screw;

[0011] The connecting block is fixedly arranged on one side of the slider; the installation cylinder is fixedly arranged on one side of the connecting block; the tightening screw is in threaded connection with the installation cylinder and passes through the installation cylinder.

[0012] Wherein, the driving mechanism includes a first rotating shaft, a gear, two racks, an installation block, a second rotating shaft, a driving pulley, a driven pulley, a transmission belt and a first knob;

[0013] The first rotating shaft is rotationally connected to the guide rail and passes through the guide rail; the gear is fixedly arranged on one side of the first rotating shaft; the two racks are respectively fixedly connected to the two sliders and are respectively meshed with the gear; the installation block is fixedly arranged on the top of the guide rail; the second rotating shaft is rotationally connected to the installation block and passes through the installation block; the driving pulley is fixedly arranged on one side of the second rotating shaft; the driven pulley is fixedly arranged on one side of the first rotating shaft; the transmission belt is arranged on the driving pulley and the driven pulley; the first knob is fixedly arranged on one side of the second rotating shaft.

[0014] Wherein, the adjusting mechanism includes an installation seat, two support blocks, a double-threaded lead screw and a second knob;

[0015] The installation seat is fixedly arranged on the top of the detection table; the two support blocks are respectively slidably connected to the installation seat, are respectively fixedly connected to the two restraint bars, and are respectively located at the bottoms of the two restraint bars; the double-threaded lead screw is rotationally connected to the installation seat, is respectively in threaded connection with the two support blocks, and respectively passes through the two support blocks; the second knob is fixedly arranged on one side of the double-threaded lead screw.

[0016] Wherein, the support frame includes two guide rods, a support plate, a mounting plate and two limiting rings;

[0017] The two guide rods are respectively slidably connected to the detection table and respectively pass through the detection table; the support plate is fixedly arranged at the tops of the two guide rods; the mounting plate is fixedly arranged at the bottoms of the two guide rods; the two limiting rings are respectively fixedly arranged on the two guide rods.

[0018] Wherein, the support frame further includes a buffer pad;

[0019] The buffer pad is fixedly arranged at the top of the support plate.

[0020] Wherein, the support frame further includes two support plates and a toggle lever;

[0021] The two support plates are respectively fixedly arranged at the bottom of the detection table; the toggle lever is rotatably arranged between the two support plates.

[0022] In a second aspect, the present invention further provides a method for detecting the light transmittance of recycled plastic particles, including:

[0023] Making the plastic particles into plastic thin sheets;

[0024] Using the adjusting mechanism to adjust the distance between the two restraint bars so that it is adapted to the size of the plastic thin sheet;

[0025] Putting the plastic thin sheet between the two restraint bars, and the plastic thin sheet falls along the two restraint bars and is supported by the support frame;

[0026] Using the driving mechanism to drive the two sliders to approach each other, driving the light source probe and the receiving probe to approach each other, and clamping the plastic thin sheet in the middle;

[0027] Starting the light source probe, the receiving probe and the main body of the light transmittance tester, and reading the light transmittance value of the plastic thin sheet from the main body of the light transmittance tester.

[0028] A device and method for detecting the light transmittance of recycled plastic particles. The light source probe is used to emit light, and the receiving probe is used to receive light. Both the light source probe and the receiving probe are connected to the main body of the light transmittance tester through cables. Two pillars support the guide rail. The inner side of the guide rail is used for slidably installing two sliders, and the top is used for fixedly installing the main body of the light transmittance tester. The driving mechanism can drive the two sliders to slide in opposite directions. Each slider is provided with a clamping mechanism. The clamping mechanism on the left is used for clamping and installing the light source probe, and the clamping mechanism on the right is used for clamping and installing the receiving probe. The light source probe and the receiving probe are aligned with each other. When the two sliders slide, they can drive the light source probe and the receiving probe to displace. The cross-section of the restraint bar is concave-shaped. The restraint bar is installed vertically. The cooperation of the two restraint bars can restrain the plastic sheet to keep it vertical and located between the light source probe and the receiving probe. The support frame is used to support the plastic sheet from the bottom. When detecting the light transmittance of plastic particles, the plastic particles are made into a plastic sheet. The distance between the two restraint bars is adjusted by using the adjustment mechanism to adapt to the size of the plastic sheet. The plastic sheet is placed between the two restraint bars, and the plastic sheet falls along the two restraint bars and is supported by the support frame. The driving mechanism is used to drive the two sliders to approach each other, driving the light source probe and the receiving probe to approach each other, and clamping the plastic sheet in the middle. The light source probe, the receiving probe and the main body of the light transmittance tester are started, and the light transmittance value of the plastic sheet is read from the main body of the light transmittance tester. It should be noted that after the distance between the two restraint bars is adjusted during the first use, when detecting plastic sheets of the same size in subsequent detections, there is no need to adjust. In subsequent detections, only the plastic sheet needs to be placed between the two restraint bars, and then the driving mechanism is used to drive the light source probe and the receiving probe to approach each other, and the light transmittance detection can be carried out. Thus, the light transmittance detection of plastic particles can be completed more conveniently. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0030] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0031] Figure 2 is Figure 1 A partial enlarged view of Detail A.

[0032] Figure 3 It is a front view of the first embodiment of the present invention.

[0033] Figure 4 It is a schematic structural diagram from another angle of the first embodiment of the present invention.

[0034] Figure 5 It is a schematic structural diagram from another angle of the first embodiment of the present invention.

[0035] Figure 6 It is a schematic flow diagram of the second embodiment of the present invention.

[0036] 1 - Main body of the light transmittance tester, 2 - Light source probe, 3 - Receiving probe, 4 - Detection table, 5 - Support pillar, 6 - Guide rail, 7 - Slide block, 8 - Clamping mechanism, 9 - Driving mechanism, 10 - Adjusting mechanism, 11 - Constraint bar, 12 - Support frame, 81 - Connecting block, 82 - Mounting cylinder, 83 - Tightening screw, 91 - First rotating shaft, 92 - Gear, 93 - Rack, 94 - Mounting block, 95 - Second rotating shaft, 96 - Driving pulley, 97 - Driven pulley, 98 - Transmission belt, 99 - First knob, 101 - Mounting seat, 102 - Support block, 103 - Double-threaded lead screw, 104 - Second knob, 121 - Guide rod, 122 - Support plate, 123 - Mounting plate, 124 - Limiting ring, 125 - Buffer pad, 126 - Support plate, 127 - Pushing rod. Detailed implementation manners

[0037] The first embodiment of the present application is as follows:

[0038] Please refer to Figures 1 - 5 , in which, Figure 1 is a schematic structural diagram of the first embodiment of the present invention. Figure 2 is Figure 1 a partial enlarged view of Detail A. Figure 3 is a front view of the first embodiment of the present invention. Figure 4 It is a schematic structural diagram from another angle of the first embodiment of the present invention. Figure 5 It is a schematic structural diagram from another angle of the first embodiment of the present invention.

[0039] The present invention provides a device for detecting the light transmittance of recycled plastic particles: a light transmittance tester main body 1, a light source probe 2 and a receiving probe 3; further comprising a detection assembly; the detection assembly includes a detection table 4, two support columns 5, a guide rail 6, two sliders 7, two clamping mechanisms 8, a driving mechanism 9, an adjusting mechanism 10, two restraint bars 11 and a support frame 12; the clamping mechanism 8 includes a connecting block 81, a mounting cylinder 82 and a tightening screw 83; the driving mechanism 9 includes a first rotating shaft 91, a gear 92, two racks 93, a mounting block 94, a second rotating shaft 95, a driving pulley 96, a driven pulley 97, a transmission belt 98 and a first knob 99; the adjusting mechanism 10 includes a mounting base 101, two support blocks 102, a double-threaded lead screw 103 and a second knob 104; the support frame 12 includes two guide rods 121, a support plate 122, a mounting plate 123 and two limiting rings 124; the support frame 12 further includes a buffer pad 125; the support frame 12 further includes two support plates 126 and a lever 127; through the foregoing solution, the light transmittance detection of plastic particles can be completed more conveniently.

[0040] Further, the light source probe 2 is electrically connected to the light transmittance tester main body 1; the receiving probe 3 is electrically connected to the light transmittance tester main body 1; the two support columns 5 are respectively fixedly arranged on the top of the detection table 4; the guide rail 6 is fixedly arranged on the tops of the two support columns 5; the two sliders 7 are respectively slidably arranged in the guide rail 6; the two clamping mechanisms 8 are respectively fixedly arranged on one side of the two sliders 7 and are respectively used for clamping and mounting the light source probe 2 and the receiving probe 3; the driving mechanism 9 is arranged on the guide rail 6 and is used for driving the two sliders 7 to slide synchronously; the adjusting mechanism 10 is arranged on the top of the detection table 4; the two restraint bars 11 are respectively arranged on the adjusting mechanism 10, and the adjusting mechanism 10 is used for adjusting the distance between the two restraint bars 11; the support frame 12 is arranged on the detection table 4; the light transmittance tester main body 1 is fixedly arranged on the top of the guide rail 6.

[0041] In this embodiment, the light source probe 2 is used to emit light, and the receiving probe 3 is used to receive light. Both the light source probe 2 and the receiving probe 3 are connected to the transmittance tester main body 1 through cables. Two of the struts 5 support the guide rail 6. The inner side of the guide rail 6 is used for slidably mounting two of the sliders 7, and the top is used for fixedly mounting the transmittance tester main body 1. The driving mechanism 9 can drive the two sliders 7 to slide in opposite directions. Each slider 7 is provided with a clamping mechanism 8. The clamping mechanism 8 on the left is used for clamping and mounting the light source probe 2, and the clamping mechanism 8 on the right is used for clamping and mounting the receiving probe 3. The light source probe 2 and the receiving probe 3 are aligned with each other. The sliding of the two sliders 7 can drive the displacement of the light source probe 2 and the receiving probe 3. The cross-section of the restraint bar 11 is concave-shaped. The restraint bar 11 is vertically installed. The cooperation of the two restraint bars 11 can restrain the plastic sheet, so that the plastic sheet remains vertical and is located between the light source probe 2 and the receiving probe 3. The support frame 12 is used to support the plastic sheet from the bottom. When detecting the transmittance of plastic particles, the plastic particles are made into a plastic sheet. The distance between the two restraint bars 11 is adjusted by using the adjusting mechanism 10 to adapt to the size of the plastic sheet. The plastic sheet is placed between the two restraint bars 11, and the plastic sheet falls along the two restraint bars 11 and is supported by the support frame 12. The driving mechanism 9 is used to drive the two sliders 7 to approach each other, driving the light source probe 2 and the receiving probe 3 to approach each other, and clamping the plastic sheet in the middle. The light source probe 2, the receiving probe 3, and the transmittance tester main body 1 are started, and the transmittance value of the plastic sheet is read from the transmittance tester main body 1. It should be noted that after the distance between the two restraint bars 11 is adjusted during the first use, when detecting plastic sheets of the same size subsequently, there is no need to adjust. During subsequent detections, only the plastic sheet needs to be placed between the two restraint bars 11, and then the driving mechanism 9 is used to drive the light source probe 2 and the receiving probe 3 to approach each other, and the transmittance detection can be carried out. Thus, the transmittance detection of plastic particles can be completed more conveniently.

[0042] Further, the connecting block 81 is fixedly arranged on one side of the slider 7; the mounting cylinder 82 is fixedly arranged on one side of the connecting block 81; the tightening screw 83 is threadedly connected to the mounting cylinder 82 and passes through the mounting cylinder 82.

[0043] In this embodiment, the connecting block 81 extends from one end of the slider 7, and the end supports the mounting cylinder 82. The tightening screw 83 is threadedly arranged on the mounting cylinder 82. After the light source probe 2 or the receiving probe 3 is inserted into the mounting cylinder 82, the tightening screw 83 is screwed to complete the clamping and mounting.

[0044] Further, the first rotating shaft 91 is rotatably connected to the guide rail 6 and passes through the guide rail 6; the gear 92 is fixedly arranged on one side of the first rotating shaft 91; the two racks 93 are respectively fixedly connected to the two sliders 7 and are respectively meshed with the gear 92; the mounting block 94 is fixedly arranged on the top of the guide rail 6; the second rotating shaft 95 is rotatably connected to the mounting block 94 and passes through the mounting block 94; the driving pulley 96 is fixedly arranged on one side of the second rotating shaft 95; the driven pulley 97 is fixedly arranged on one side of the first rotating shaft 91; the transmission belt 98 is arranged on the driving pulley 96 and the driven pulley 97; the first knob 99 is fixedly arranged on one side of the second rotating shaft 95.

[0045] In this embodiment, the front end of the first rotating shaft 91 is used to mount the gear 92, and the rear end is used to mount the driven pulley 97; the front end of the second rotating shaft 95 is used to mount the first knob 99, and the rear end is used to mount the driving pulley 96. The two racks 93 are meshed and mounted on the gear 92 one above the other. When in use, rotate the first knob 99 to drive the second rotating shaft 95 to rotate. The second rotating shaft 95 drives the driving pulley 96 to rotate. The driving pulley 96 drives the driven pulley 97 to rotate through the transmission belt 98. The driven pulley 97 drives the first rotating shaft 91 to rotate. The first rotating shaft 91 drives the gear 92 to rotate. The gear 92 then drives the two meshed racks 93, thereby driving the two sliders 7 to slide.

[0046] Further, the mounting seat 101 is fixedly arranged on the top of the detection table 4; the two support blocks 102 are respectively slidably connected to the mounting seat 101, are respectively fixedly connected to the two restraint bars 11, and are respectively located at the bottoms of the two restraint bars 11; the double-threaded lead screw 103 is rotatably connected to the mounting seat 101, is respectively threadedly connected to the two support blocks 102, and respectively passes through the two support blocks 102; the second knob 104 is fixedly arranged on one side of the double-threaded lead screw 103.

[0047] In this embodiment, the mounting seat 101 is used to slidably mount the two support blocks 102 and rotatably mount the double-threaded lead screw 103. The threads of the double-threaded lead screw 103 are divided into two sections, the front and the rear, and the thread directions of the two sections are opposite. Therefore, rotating the double-threaded lead screw 103 can drive the two support blocks 102 to slide in opposite directions. The two support blocks 102 then drive the two restraint bars 11 to move in opposite directions, so as to adjust the distance between the two restraint bars 11. The second knob 104 is used to conveniently turn the double-threaded lead screw 103.

[0048] Further, the two guide rods 121 are respectively slidably connected to the detection table 4 and respectively pass through the detection table 4; the support plate 122 is fixedly arranged on the tops of the two guide rods 121; the mounting plate 123 is fixedly arranged on the bottoms of the two guide rods 121; the two limit rings 124 are respectively fixedly arranged on the two guide rods 121.

[0049] In this embodiment, the two guide rods 121 are slidably arranged on the detection table 4 and are limited by the two limit rings 124. The two guide rods 121 support the support plate 122. During detection, the support plate 122 is used to support the bottom end of the plastic sheet. After the detection is completed and the plastic sheet needs to be taken out, the mounting plate 123 is pushed upward. The mounting plate 123 pushes the two guide rods 121 upward. The two guide rods 121 push the support plate 122 upward. The support plate 122 pushes the plastic sheet out from between the two restraint bars 11. After the plastic sheet is taken out, the mounting plate 123 is released, and the two guide rods 121 slide down to reset, and the support plate 122 also slides down to reset.

[0050] Further, the buffer pad 125 is fixedly arranged on the top of the support plate 122.

[0051] In this embodiment, when the plastic sheet falls along the two restraint bars 11, it will directly collide with the support plate 122, which may be damaged and affect the detection. Therefore, the buffer pad 125 is provided to prevent the plastic sheet from being damaged by colliding with the support plate 122.

[0052] Further, the two support plates 126 are respectively fixedly arranged at the bottom of the detection table 4; the lever 127 is rotatably arranged between the two support plates 126.

[0053] In this embodiment, the two support plates 126 are used to rotatably mount the lever 127. Press the upper end of the lever 127 and rotate the lever 127. The lower end of the lever 127 can push the mounting plate 123 upward, and finally it is used to facilitate taking out the detected plastic sheet.

[0054] A device for detecting the light transmittance of recycled plastic particles according to this embodiment, wherein the light source probe 2 is used to emit light, and the receiving probe 3 is used to receive light. Both the light source probe 2 and the receiving probe 3 are connected to the light transmittance tester main body 1 through cables; the two struts 5 support the guide rail 6. The inner side of the guide rail 6 is used for slidably installing the two sliders 7, and the top is used for fixedly installing the light transmittance tester main body 1. The driving mechanism 9 can drive the two sliders 7 to slide in opposite directions. Each slider 7 is provided with a clamping mechanism 8. The clamping mechanism 8 on the left is used for clamping and installing the light source probe 2, and the clamping mechanism 8 on the right is used for clamping and installing the receiving probe 3. The light source probe 2 and the receiving probe 3 are aligned with each other. When the two sliders 7 slide, they can drive the light source probe 2 and the receiving probe 3 to displace; the cross section of the restraint bar 11 is concave-shaped, and the restraint bar 11 is vertically installed. The two restraint bars 11 cooperate to restrain the plastic sheet, so that the plastic sheet remains vertical and is located between the light source probe 2 and the receiving probe 3. The support frame 12 is used to support the plastic sheet from the bottom; when detecting the light transmittance of plastic particles, the plastic particles are made into plastic sheets; the distance between the two restraint bars 11 is adjusted by using the adjusting mechanism 10 to adapt to the size of the plastic sheet; the plastic sheet is placed between the two restraint bars 11, and the plastic sheet falls along the two restraint bars 11 and is supported by the support frame 12; the driving mechanism 9 is used to drive the two sliders 7 to approach each other, driving the light source probe 2 and the receiving probe 3 to approach each other, and clamping the plastic sheet in the middle; the light source probe 2, the receiving probe 3 and the light transmittance tester main body 1 are started, and the light transmittance value of the plastic sheet is read from the light transmittance tester main body 1; it should be noted that after the distance between the two restraint bars 11 is adjusted for the first time during use, when detecting plastic sheets of the same size subsequently, there is no need to adjust. During subsequent detection, only the plastic sheet needs to be placed between the two restraint bars 11, and then the driving mechanism 9 is used to drive the light source probe 2 and the receiving probe 3 to approach each other, and the light transmittance detection can be carried out; thus, the light transmittance detection of plastic particles can be completed more conveniently.

[0055] The second embodiment of this application is as follows:

[0056] Please refer to Figure 6 , wherein, Figure 6 is a schematic flowchart of the second embodiment of the present invention.

[0057] A method for detecting the light transmittance of recycled plastic particles provided by the present invention includes:

[0058] S1 Making the plastic particles into plastic sheets;

[0059] S2 uses the adjustment mechanism 10 to adjust the distance between the two restraint bars 11 so that it is adapted to the size of the plastic sheet;

[0060] S3 places the plastic sheet between the two restraint bars 11, and the plastic sheet falls along the two restraint bars 11 and is supported by the support frame 12;

[0061] S4 uses the drive mechanism 9 to drive the two sliders 7 to move closer to each other, driving the light source probe 2 and the receiving probe 3 to move closer to each other, and clamping the plastic sheet in the middle;

[0062] S5 activates the light source probe 2, the receiving probe 3 and the main body 1 of the transmittance tester, and reads the transmittance value of the plastic sheet from the main body 1 of the transmittance tester.

[0063] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A device for detecting the light transmittance of recycled plastic particles, comprising a main body of a light transmittance tester, a light source probe, and a receiving probe; the light source probe is electrically connected to the main body of the light transmittance tester; the receiving probe is electrically connected to the main body of the light transmittance tester; characterized in that, it further comprises a detection assembly; the detection assembly includes a detection table, two support columns, a guide rail, two sliders, two clamping mechanisms, a driving mechanism, an adjusting mechanism, two restraint bars, and a support frame; the two support columns are respectively fixedly arranged on the top of the detection table; the guide rail is fixedly arranged on the tops of the two support columns; the two sliders are respectively slidably arranged in the guide rail; the two clamping mechanisms are respectively fixedly arranged on one side of the two sliders, and are respectively used for clamping and installing the light source probe and the receiving probe; the driving mechanism is arranged on the guide rail and is used for driving the two sliders to slide synchronously; the adjusting mechanism is arranged on the top of the detection table; the two restraint bars are respectively arranged on the adjusting mechanism, and the adjusting mechanism is used for adjusting the distance between the two restraint bars; the support frame is arranged on the detection table; the main body of the light transmittance tester is fixedly arranged on the top of the guide rail.

2. The device for detecting the light transmittance of recycled plastic particles according to claim 1, characterized in that, the clamping mechanism includes a connecting block, an installation cylinder, and a tightening screw; the connecting block is fixedly arranged on one side of the slider; the installation cylinder is fixedly arranged on one side of the connecting block; the tightening screw is threadedly connected to the installation cylinder and passes through the installation cylinder.

3. The device for detecting the light transmittance of recycled plastic particles according to claim 2, characterized in that, the driving mechanism includes a first rotating shaft, a gear, two racks, an installation block, a second rotating shaft, a driving pulley, a driven pulley, a transmission belt, and a first knob; the first rotating shaft is rotatably connected to the guide rail and passes through the guide rail; the gear is fixedly arranged on one side of the first rotating shaft; the two racks are respectively fixedly connected to the two sliders and are respectively engaged with the gear; the installation block is fixedly arranged on the top of the guide rail; the second rotating shaft is rotatably connected to the installation block and passes through the installation block; the driving pulley is fixedly arranged on one side of the second rotating shaft; the driven pulley is fixedly arranged on one side of the first rotating shaft; the transmission belt is arranged on the driving pulley and the driven pulley; the first knob is fixedly arranged on one side of the second rotating shaft.

4. The device for detecting the light transmittance of recycled plastic particles according to claim 3, characterized in that, the adjusting mechanism includes an installation seat, two support blocks, a double-threaded lead screw, and a second knob; the installation seat is fixedly arranged on the top of the detection table; the two support blocks are respectively slidably connected to the installation seat, are respectively fixedly connected to the two restraint bars, and are respectively located at the bottoms of the two restraint bars; the double-threaded lead screw is rotatably connected to the installation seat and is respectively threadedly connected to the two support blocks and passes through the two support blocks; the second knob is fixedly arranged on one side of the double-threaded lead screw.

5. The light transmittance detection device for recycled plastic particles according to claim 4, wherein the support frame includes two guide rods, a support plate, a mounting plate and two limiting rings; the two guide rods are respectively slidably connected to the detection table and respectively pass through the detection table; the support plate is fixedly arranged at the tops of the two guide rods; the mounting plate is fixedly arranged at the bottoms of the two guide rods; the two limiting rings are respectively fixedly arranged on the two guide rods.

6. The light transmittance detection device for recycled plastic particles according to claim 5, wherein the support frame further includes a buffer pad; the buffer pad is fixedly arranged at the top of the support plate.

7. The light transmittance detection device for recycled plastic particles according to claim 6, wherein the support frame further includes two support plates and a lever; the two support plates are respectively fixedly arranged at the bottom of the detection table; the lever is rotatably arranged between the two support plates.

8. A method for detecting the light transmittance of recycled plastic particles, which is applied to a device for detecting the light transmittance of recycled plastic particles according to any one of claims 1 to 7; characterized in that, Comprising: making plastic particles into plastic sheets; using the adjusting mechanism to adjust the distance between the two restraint strips so that it is adapted to the size of the plastic sheet; putting the plastic sheet between the two restraint strips, and the plastic sheet falls along the two restraint strips and is supported by the support frame; using the driving mechanism to drive the two sliders to approach each other, driving the light source probe and the receiving probe to approach each other, and clamping the plastic sheet in the middle; starting the light source probe, the receiving probe and the light transmittance tester main body, and reading out the light transmittance value of the plastic sheet from the light transmittance tester main body.

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