Transparent PET master batch screening device and screening method thereof

Abstract

The invention discloses a transparent PET master batch screening device and a screening method thereof, and relates to the technical field of transparent PET master batch processing.The transparent PET master batch screening device comprises a screening mechanism, the screening mechanism is provided with a sorting mechanism, and the sorting mechanism comprises a water tank, a U-shaped frame, an auxiliary frame, a box body, a first water pump, a second water pump, a double-hole box and a one-way valve; round rods are rotationally connected into the two through holes of the double-hole box through bearings. According to the transparent PET master batch screening device, the sorting mechanism is arranged, so that the transparent PET master batch screening device has the function of sorting defective products of screened PET master batches, and the situation that the defective master batches are mixed into qualified products, and the quality and performance of final products are affected in the subsequent machining process is avoided; the use effect of the transparent PET master batch screening device is improved, and meanwhile the use efficiency of the transparent PET master batch screening device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of transparent PET masterbatch processing, in particular to a transparent PET masterbatch screening device and a screening method thereof. Background Art

[0002] Transparent PET masterbatch is a granular material with polyethylene terephthalate as the main component. It has excellent flame retardant properties and environmental protection characteristics. It is widely used in packaging, functional coatings and films. The processing of transparent PET masterbatch generally includes cooling, drying and screening steps. When screening transparent PET masterbatch, a transparent PET masterbatch screening device is required.

[0003] When the existing transparent PET masterbatch screening device is in use, although it can screen out the transparent PET masterbatch that does not meet the specified size range, thereby ensuring that the masterbatch size entering the subsequent production link is uniform, thereby improving the quality and performance of the final product, but it does not have the function of sorting the screened PET masterbatch for defective products, that is, the existing transparent PET masterbatch screening device cannot sort the screened masterbatch for defective products during use, and it is easy for the defective masterbatch to be mixed into the qualified products. In the subsequent processing process, these defective products will affect the quality and performance of the final product, which not only reduces the use effect of the transparent PET masterbatch screening device, but also reduces the use efficiency of the transparent PET masterbatch screening device.

[0004] Therefore, we propose an intelligent and efficient metal processing equipment and a method of using the same to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a transparent PET masterbatch screening device and a screening method thereof, so as to solve the problem that the existing transparent PET masterbatch screening device proposed in the above background technology does not have the function of sorting the screened PET masterbatch into defective products, that is, the existing transparent PET masterbatch screening device cannot sort the screened masterbatch into defective products during use, and it is easy for the defective masterbatch to be mixed into the qualified products. In the subsequent processing process, these defective products will affect the quality and performance of the final product, which not only reduces the use effect of the transparent PET masterbatch screening device, but also reduces the use efficiency of the transparent PET masterbatch screening device.

[0006] To achieve the above object, the present invention provides the following technical solutions: a transparent PET masterbatch screening device, comprising a screening mechanism, wherein a sorting mechanism is provided on the screening mechanism; The sorting mechanism includes a water tank, a U-shaped frame, an auxiliary frame, a box body, a first water pump, a second water pump, a double-hole box and a one-way valve. The two through holes of the double-hole box are both rotatably connected with round rods through bearings. Two symmetrical rotating rods are movably penetrated through the front surface of the double-hole box. A porous plate is fixed on the outer surface of each rotating rod. A filter shell is placed at the top opening of the box body. Electric valves are installed at the water outlet end of the double-hole box and the water outlet end of the box body. Connecting pipes are installed at the water inlet end of the first water pump and the water outlet end of the first water pump. Flexible hoses are installed at the water inlet end of one of the connecting pipes. A three-way pipe is installed at the water inlet end of one of the connecting pipes. Two symmetrical driving motors are installed on the front surface of the double-hole box. A driver is installed on one side of the double-hole box. A handle is fixed on one side of the double-hole box. A filter plate is bonded to a side of the inner wall of the double-hole box close to the one-way valve.

[0007] Preferably, one of the round rods is fixed inside the U-shaped frame, and the other round rod is slidably connected inside the auxiliary frame, the front surfaces of the two porous plates are in contact with the front surface of the inner wall of the double-hole box, the rear surfaces of the two porous plates are in contact with the rear surface of the inner wall of the double-hole box, and one end of the two rotating rods is respectively installed with the output ends of the two driving motors.

[0008] Preferably, the outer surfaces of the two rotating rods are respectively in contact with the two sides of the inner wall of the double-hole box, the water outlet end of the other connecting pipe is installed with the water inlet end of the water tank, the water inlet end of one of the hoses is installed with the water outlet end of the water tank, and the other ends of the two rotating rods are movable through the rear surface of the inner wall of the double-hole box.

[0009] Preferably, the water outlet end of the other hose is fixedly passed through the rear surface of the double-hole box, the water outlet end of the other hose is installed with the water inlet end of the one-way valve, the two water outlet ends of the three-way pipe are respectively installed with the water inlet ends of the two electric valves, the two driving motors are electrically connected to the driver, and the filter plate is located at the water inlet of the water outlet end of the double-hole box.

[0010] Preferably, the screening mechanism includes a bracket, a shell and four groups of mounting blocks, four pillars are fixed to the top of the bracket, connecting plates are fixed to the front surface of the inner wall of the shell and the rear surface of the inner wall of the shell, and a screen is installed between the upper sides of two connecting plates.

[0011] Preferably, a guide shell is fixed on one side of the shell, a spring is installed between the inside of each group of the mounting blocks, rectangular blocks are fixed to the front surface and the rear surface of the shell, a rectangular plate is fixed inside the bracket near the bottom, a controller is installed on the top of the rectangular plate, and a vibration motor is installed on the outer surface of the shell.

[0012] Preferably, the top of each of the pillars is respectively fixed to the bottom of one of the mounting blocks in each group of mounting blocks, the bottom of each of the rectangular blocks is respectively mounted to the top of another mounting block in each group of mounting blocks, the discharge end of the shell is located inside the bracket, the discharge end of the guide shell is located inside the bracket, the number of mounting blocks in each group is two, and the vibration motor is electrically connected to the controller.

[0013] Preferably, the water tank is placed on the top of the rectangular plate, the bottom of the U-shaped frame is fixed to the top of the rectangular plate, the bottom of the auxiliary frame is fixed to the top of the rectangular plate, the bottom of the box body is fixed to the top of the rectangular plate, and the first water pump is installed on the top of the rectangular plate.

[0014] Preferably, the first water pump is electrically connected to the controller, the second water pump is installed on the top of the rectangular plate, the second water pump is electrically connected to the controller, the two electric valves are electrically connected to the controller, and the driver is electrically connected to the controller.

[0015] A screening method for a transparent PET masterbatch screening device comprises the following steps: S1. When transparent PET masterbatch needs to be screened, the screen is vibrated by using the cooperation of the controller, the vibration motor, the shell, two connecting plates, the bracket, four pillars, four springs, four sets of mounting blocks and four rectangular blocks. Then, a proper amount of water is transported into the double-hole box by using the cooperation of the controller, the second water pump, two hoses, the water tank and the one-way valve, and then a proper amount of PET masterbatch is slowly released to the position just above the shell near the other side; S2. When the PET masterbatch contacts the vibrating screen, the PET masterbatch can be screened under the action of the vibrating screen. At this time, the PET masterbatch that meets the required size will enter the inside of the double-hole box, and the qualified PET masterbatch will sink into the water inside the double-hole box, while the defective PET masterbatch will float on the water surface inside the double-hole box. When the appropriate amount of PET masterbatch is screened by size, the two porous plates are driven to rotate towards each other by the cooperation of the controller, the driver, the two drive motors, the two rotating rods and the double-hole box until both porous plates rotate to the desired degree. S3, then use the handle, one of the round rods, the corresponding bearing and the U-shaped frame to rotate the double-hole box, and the rotating double-hole box will release the defective PET masterbatch and part of the water floating on the water surface inside the double-hole box into the inside of the filter shell. At the same time, the rotating double-hole box will retain the qualified PET masterbatch inside the double-hole box with the cooperation of two porous plates and two rotating rods. At the same time, the water entering the filter shell will flow into the inside of the box, and the defective PET masterbatch will remain in the inside of the filter shell. Then the double-hole box is reset to its original position; S4. Then, the controller, two electric valves, the first water pump, two connecting pipes and the three-way pipe are used to transport the water inside the double-hole box and the water inside the box body to the inside of the water tank. At this time, the qualified PET masterbatch inside the double-hole box will be retained in the double-hole box with the cooperation of the filter plate. Then, the controller, the driver, two drive motors, the two rotating rods and the double-hole box are used to drive the two porous plates to reset and move, and then the qualified PET masterbatch can be removed from the inside of the double-hole box.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a sorting mechanism, the transparent PET masterbatch screening device can be equipped with the function of sorting defective PET masterbatch screened out, thereby avoiding the defective masterbatch from being mixed into qualified products, which affects the quality and performance of the final product in the subsequent processing process. It not only improves the use effect of the transparent PET masterbatch screening device, but also improves the use efficiency of the transparent PET masterbatch screening device. With the cooperation of the started second water pump and the hose, the water inside the water tank can be pumped out and transported to the inside of the one-way valve. Under the action of the closed electric valve, the water inside the double-hole box and the box body can be prevented from automatically flowing into the inside of the three-way pipe. Under the action of the one-way valve, the water inside the double-hole box can be prevented from flowing into the inside of the other hose when it rotates.

[0017] 2. By setting up a screening mechanism, transparent PET masterbatches that do not meet the specified size range can be screened out, thereby ensuring that the masterbatches entering the subsequent production links are of uniform size. The screen can be fixed to the shell with the cooperation of two connecting plates. The influence of the shell vibration on the bracket can be reduced with the cooperation of rectangular blocks, springs, mounting blocks and pillars. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a transparent PET masterbatch screening device of the present invention; Figure 2 It is a three-dimensional diagram from another angle of a transparent PET masterbatch screening device of the present invention; Figure 3 It is a partial three-dimensional diagram of another state of a transparent PET masterbatch screening device of the present invention; Figure 4 It is a partial stereoscopic diagram of a transparent PET masterbatch screening device of the present invention; Figure 5 It is a partial cross-sectional view of a screening mechanism of a transparent PET masterbatch screening device of the present invention; Figure 6 It is a schematic diagram of the structure of another state of a sorting mechanism of a transparent PET masterbatch screening device of the present invention; Figure 7 It is a partial three-dimensional diagram of a screening mechanism of a transparent PET masterbatch screening device of the present invention; Figure 8 It is a partially cutaway stereoscopic view of another state of a sorting mechanism of a transparent PET masterbatch screening device of the present invention; Fig. 9 The present invention provides a partially cutaway stereoscopic view of a sorting mechanism of a transparent PET masterbatch screening device.

[0019] In the figure: 1. Screening mechanism; 101. Bracket; 102. Pillar; 103. Shell; 104. Connecting plate; 105. Screen; 106. Guide shell; 107. Mounting block; 108. Spring; 109. Rectangular block; 110. Rectangular plate; 111. Controller; 112. Vibrating motor; 2. Sorting mechanism; 201. Water tank; 202. U-shaped frame; 203. Auxiliary frame; 204. Box; 205. First water pump; 206. Second water pump; 207. Double-hole box; 208. Rotating rod; 209. Perforated plate; 210. Filter shell; 211. Electric valve; 212. Connecting pipe; 213. Hose; 214. Three-way pipe; 215. Driving motor; 216. One-way valve; 217. Driver; 218. Handle; 219. Round rod; 220. Filter plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Reference Figure 1-Figure 9 As shown: a transparent PET masterbatch screening device, comprising a screening mechanism 1, on which a sorting mechanism 2 is arranged; The sorting mechanism 2 includes a water tank 201, a U-shaped frame 202, an auxiliary frame 203, a box body 204, a first water pump 205, a second water pump 206, a double-hole box 207 and a one-way valve 216. The two through holes of the double-hole box 207 are both rotatably connected with round rods 219 through bearings. Two symmetrical rotating rods 208 are movably penetrated through the front surface of the double-hole box 207. The outer surface of each rotating rod 208 is fixed with a porous plate 209. A filter shell 210 is placed at the top opening of the box body 204. The water outlet end of the double-hole box 207 and the water outlet end of the box body 204 are both installed with electric valves 219. 11. The water inlet end of the first water pump 205 and the water outlet end of the first water pump 205 are both installed with a connecting pipe 212, the water inlet end of the second water pump 206 and the water outlet end of the second water pump 206 are both installed with a hose 213, a three-way pipe 214 is installed at the water inlet end of one of the connecting pipes 212, two symmetrical driving motors 215 are installed on the front surface of the double-hole box 207, a driver 217 is installed on one side of the double-hole box 207, a handle 218 is fixed on one side of the double-hole box 207, and a filter plate 220 is bonded to one side of the inner wall of the double-hole box 207 close to the one-way valve 216.

[0022] like Figure 1-Figure 4 , Figure 6 and Figure 8 As shown, one of the round rods 219 is fixed inside the U-shaped frame 202, and the other round rod 219 is slidably connected to the inside of the auxiliary frame 203. The front surfaces of the two porous plates 209 are in contact with the front surfaces of the inner walls of the double-hole box 207, and the rear surfaces of the two porous plates 209 are in contact with the rear surfaces of the inner walls of the double-hole box 207. One ends of the two rotating rods 208 are respectively installed with the output ends of the two driving motors 215, so that the two rotating rods 208 can be driven to rotate simultaneously under the cooperation of the two driving motors 215 and the double-hole box 207 that are started at the same time.

[0023] like Figure 1-Figure 4 , Figure 6 and Figure 8 As shown, the outer surfaces of the two rotating rods 208 are respectively in contact with the two sides of the inner wall of the double-hole box 207, the water outlet end of the other connecting pipe 212 is installed with the water inlet end of the water tank 201, and the water inlet end of one of the hoses 213 is installed with the water outlet end of the water tank 201. The other ends of the two rotating rods 208 are movable through the rear surface of the inner wall of the double-hole box 207, and can provide installation positions for the two driving motors 215 and the driver 217 under the action of the double-hole box 207.

[0024] like Figure 1-Figure 4 , Figure 6 , Figure 8 and Fig. 9As shown, the water outlet end of another hose 213 is fixedly passed through the rear surface of the double-hole box 207, the water outlet end of the other hose 213 is installed with the water inlet end of the one-way valve 216, the two water outlet ends of the three-way pipe 214 are respectively installed with the water inlet ends of the two electric valves 211, the two driving motors 215 are electrically connected to the driver 217, and the filter plate 220 is located at the water inlet of the water outlet end of the double-hole box 207, so as to prevent qualified PET masterbatch from flowing away through the water outlet end of the double-hole box 207 under the action of the filter plate 220.

[0025] like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the screening mechanism 1 includes a bracket 101, a shell 103 and four groups of mounting blocks 107. Four pillars 102 are fixed to the top of the bracket 101. Connecting plates 104 are fixed to the front surface of the inner wall of the shell 103 and the rear surface of the inner wall of the shell 103. A screen 105 is installed between the upper sides of the two connecting plates 104. Under the action of the vibrating screen 105, the PET masterbatch in contact with the screen 105 can be screened.

[0026] like Figure 1-Figure 5 and Figure 7 As shown, a guide shell 106 is fixed to one side of the shell 103, springs 108 are installed between the inside of each group of mounting blocks 107, rectangular blocks 109 are fixed to the front surface of the shell 103 and the rear surface of the shell 103, a rectangular plate 110 is fixed to the inside of the bracket 101 near the bottom, a controller 111 is installed on the top of the rectangular plate 110, and a vibration motor 112 is installed on the outer surface of the shell 103, so that the shell 103 can vibrate with the cooperation of the controller 111 and the vibration motor 112.

[0027] like Figure 1-Figure 5 and Figure 7 As shown, the top of each pillar 102 is respectively fixed to the bottom of one of the mounting blocks 107 in each group of mounting blocks 107, the bottom of each rectangular block 109 is respectively installed with the top of another mounting block 107 in each group of mounting blocks 107, the discharge end of the shell 103 is inside the bracket 101, the discharge end of the guide shell 106 is inside the bracket 101, the number of each group of mounting blocks 107 is two, the vibration motor 112 is electrically connected to the controller 111, and the water inside the water tank 201 can be pumped out and transported to the inside of the other hose 213 with the cooperation of the controller 111, the second water pump 206 and one of the hoses 213.

[0028] like Figure 1-Figure 4 , Figure 6 and Fig. 9As shown, the water tank 201 is placed on the top of the rectangular plate 110, the bottom of the U-shaped frame 202 is fixed to the top of the rectangular plate 110, the bottom of the auxiliary frame 203 is fixed to the top of the rectangular plate 110, the bottom of the box body 204 is fixed to the top of the rectangular plate 110, and the first water pump 205 is installed on the top of the rectangular plate 110, so that the rectangular plate 110 can provide an installation position for the first water pump 205 and the second water pump 206.

[0029] like Figure 1-Figure 4 , Figure 6 and Fig. 9 As shown, the first water pump 205 is electrically connected to the controller 111, the second water pump 206 is installed on the top of the rectangular plate 110, the second water pump 206 is electrically connected to the controller 111, the two electric valves 211 are electrically connected to the controller 111, and the driver 217 is electrically connected to the controller 111. With the cooperation of the controller 111 and the driver 217, the two drive motors 215 can be started at the same time.

[0030] In the present invention, when it is necessary to screen the transparent PET masterbatch, the controller 111 is first connected to the external power supply, and then the prepared collection box is placed on the top of the rectangular plate 110 and is directly below the discharge end of the guide shell 106. Then, the second water pump 206 is started by the controller 111. The started second water pump 206 will, with the cooperation of the two hoses 213 and the one-way valve 216, pump out the water inside the water tank 201 and transport it to the inside of the double-hole box 207. When the water inside the double-hole box 207 submerges the two rotating rods 208 and does not exceed the upper side of the double-hole box 207, the second water pump 206 is first turned off by the controller 111, and then the vibration motor 112 is started. The vibration motor 112 started at the shell 10 3 and the two connecting plates 104, the screen 105 is driven to vibrate. At the same time, with the cooperation of the four pillars 102, the four sets of mounting blocks 107, the four springs 108 and the four rectangular blocks 109, the influence of the vibration of the shell 103 on the bracket 101 is reduced. Then, an appropriate amount of PET masterbatch is slowly released from the position just above the shell 103 near the other side to the vibrating screen 105. At this time, the PET masterbatch in contact with the screen 105 will be screened under the action of the vibrating screen 105. At this time, the PET masterbatch that does not meet the required size will enter the interior of the collection box with the cooperation of the screen 105 and the guide shell 106, while the PET masterbatch that meets the required size will enter the collection box with the cooperation of the screen 105 and the shell 103. When the PET masterbatch enters the double-hole box 207, the qualified PET masterbatch will sink into the water inside the double-hole box 207, while the defective PET masterbatch (PET masterbatch with bubbles) will float on the water surface inside the double-hole box 207. When the appropriate amount of PET masterbatch is screened, the vibration motor 112 is first turned off by the controller 111, and then the two drive motors 215 are started at the same time with the cooperation of the driver 217. At this time, the turned-off vibration motor 112 will stop the vibration of the screen 105 under the cooperation of the above-mentioned components, and the two started drive motors 215 will drive the two rotating rods 208 to rotate in opposite directions under the cooperation of the double-hole box 207, and the two rotating rods rotating in opposite directions 208 will drive the corresponding porous plates 209 to rotate towards each other. When the two porous plates 209 are rotated 90 degrees, the outer surfaces of the two porous plates 209 are just in contact with each other. At the same time, the two driving motors 215 are turned off by the cooperation of the controller 111 and the driver 217. Then, a force is applied to the double-hole box 207 by the cooperation of the handle 218, so that the double-hole box 207 rotates with the cooperation of one of the round rods 219, the corresponding bearing and the U-shaped frame 202. At this time, the rotating double-hole box 207 will drive the other round rod 219 to move inside the auxiliary frame 203 with the cooperation of the corresponding bearing. At the same time, the rotating double-hole box 207 will release the water inside its internal part into the inside of the filter shell 210. At the same time,The defective PET masterbatch floating on the water surface inside the double-hole box 207 will be released into the interior of the filter shell 210 along with the water, while the qualified PET masterbatch sunk into the water inside the double-hole box 207 will remain in the double-hole box 207 with the cooperation of the two porous plates 209 and the two rotating rods 208. When the defective PET masterbatch is released into the interior of the filter shell 210 along with the water, under the action of the filter shell 210, the defective PET masterbatch will remain in the filter shell 210, and the water will be released into the box body 204. When all the defective PET masterbatch inside the double-hole box 207 is released into the interior of the filter shell 210, the double-hole box 207 can be directly reset to its original position with the cooperation of the above-mentioned components, and then the two electric valves 211 and the first water pump 205 are started by the controller 111. At this time, the started first water pump 205 will be in the two connecting pipes 212, With the cooperation of the three-way pipe 214 and the two activated electric valves 211, the remaining water in the double-hole box 207 and the water in the box body 204 are pumped out and transported to the inside of the water tank 201. At the same time, the qualified PET masterbatch in the double-hole box 207 will flow into the inside of the double-hole box 207 under the action of the filter plate 220. When the water in the double-hole box 207 and the water in the box body 204 are transported to the inside of the water tank 201, the two electric valves 211 and the first water pump 205 are first closed by the controller 111, and then the two porous plates 209 are driven to reset and rotate by the cooperation of the controller 111, the driver 217, the two drive motors 215 and the two rotating rods 208 until the two porous plates 209 are reset to their original positions, and then the qualified PET masterbatch and the defective PET masterbatch are removed from the inside of the double-hole box 207 and the inside of the filter shell 210 respectively.

[0031] Among them, bearings are common parts in real life.

[0032] The three-way pipe 214 is made of rubber material and can be bent and deformed.

[0033] The other round rod 219 is slidably connected inside the auxiliary frame 203 , which mainly means that the two ends of the other round rod 219 are slidably connected inside the two arc-shaped holes of the auxiliary frame 203 .

[0034] Among them, the controller 111 (PLC controller), the vibration motor 112, the first water pump 205, the second water pump 206, the electric valve 211, the driver 217 and the drive motor 215 are all existing technologies, and their working principles are all public technologies. Their models can be selected according to actual conditions and no further explanation is given here.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A transparent PET masterbatch screening device, comprising a screening mechanism (1), characterized in that: The screening mechanism (1) is provided with a sorting mechanism (2); The sorting mechanism (2) comprises a water tank (201), a U-shaped frame (202), an auxiliary frame (203), a box body (204), a first water pump (205), a second water pump (206), a double-hole box (207) and a one-way valve (216); the two through holes of the double-hole box (207) are both rotatably connected to round rods (219) via bearings; two symmetrical rotating rods (208) are movably penetrated through the front surface of the double-hole box (207); a porous plate (209) is fixed to the outer surface of each rotating rod (208); a filter shell (210) is placed at the top opening of the box body (204); and electric valves (216) are installed at the water outlet end of the double-hole box (207) and the water outlet end of the box body (204). 211), the water inlet end of the first water pump (205) and the water outlet end of the first water pump (205) are both installed with a connecting pipe (212), the water inlet end of the second water pump (206) and the water outlet end of the second water pump (206) are both installed with a hose (213), and a three-way pipe (214) is installed at the water inlet end of one of the connecting pipes (212), two symmetrical driving motors (215) are installed on the front surface of the double-hole box (207), a driver (217) is installed on one side of the double-hole box (207), a handle (218) is fixed on one side of the double-hole box (207), and a filter plate (220) is bonded to a side of the inner wall of the double-hole box (207) close to the one-way valve (216).

2. The transparent PET masterbatch screening device according to claim 1, characterized in that: One of the round rods (219) is fixed inside the U-shaped frame (202), the other round rod (219) is slidably connected inside the auxiliary frame (203), the front surfaces of the two porous plates (209) are in contact with the front surface of the inner wall of the double-hole box (207), the rear surfaces of the two porous plates (209) are in contact with the rear surface of the inner wall of the double-hole box (207), and one end of the two rotating rods (208) is respectively installed with the output ends of the two driving motors (215).

3. The transparent PET masterbatch screening device according to claim 2, characterized in that: The outer surfaces of the two rotating rods (208) are respectively in contact with the two sides of the inner wall of the double-hole box (207); the water outlet end of the other connecting pipe (212) is installed with the water inlet end of the water tank (201); the water inlet end of one of the hoses (213) is installed with the water outlet end of the water tank (201); and the other ends of the two rotating rods (208) are movably inserted through the rear surface of the inner wall of the double-hole box (207).

4. The transparent PET masterbatch screening device according to claim 3, characterized in that: The water outlet end of the other hose (213) is fixedly connected to the rear surface of the double-hole box (207); the water outlet end of the other hose (213) is installed with the water inlet end of the one-way valve (216); the two water outlet ends of the three-way pipe (214) are installed with the water inlet ends of the two electric valves (211) respectively; the two driving motors (215) are electrically connected to the driver (217); and the filter plate (220) is located at the water inlet of the water outlet end of the double-hole box (207).

5. The transparent PET masterbatch screening device according to claim 4, characterized in that: The screening mechanism (1) comprises a bracket (101), a shell (103) and four groups of mounting blocks (107); four pillars (102) are fixed to the top of the bracket (101); a connecting plate (104) is fixed to the front surface of the inner wall of the shell (103) and the rear surface of the inner wall of the shell (103); and a screen (105) is installed between the upper sides of two connecting plates (104).

6. The transparent PET masterbatch screening device according to claim 5, characterized in that: A flow guide shell (106) is fixed to one side of the shell (103), a spring (108) is installed between the inside of each group of the mounting blocks (107), a rectangular block (109) is fixed to the front surface of the shell (103) and the rear surface of the shell (103), a rectangular plate (110) is fixed to the inside of the bracket (101) near the bottom, a controller (111) is installed on the top of the rectangular plate (110), and a vibration motor (112) is installed on the outer surface of the shell (103).

7. The transparent PET masterbatch screening device according to claim 6, characterized in that: The top of each of the pillars (102) is respectively fixed to the bottom of one of the mounting blocks (107) in each group of mounting blocks (107); the bottom of each of the rectangular blocks (109) is respectively mounted to the top of another mounting block (107) in each group of mounting blocks (107); the discharge end of the shell (103) is located inside the bracket (101); the discharge end of the guide shell (106) is located inside the bracket (101); the number of mounting blocks (107) in each group is two; and the vibration motor (112) is electrically connected to the controller (111).

8. The transparent PET masterbatch screening device according to claim 7, characterized in that: The water tank (201) is placed on top of the rectangular plate (110), the bottom of the U-shaped frame (202) is fixed to the top of the rectangular plate (110), the bottom of the auxiliary frame (203) is fixed to the top of the rectangular plate (110), the bottom of the box body (204) is fixed to the top of the rectangular plate (110), and the first water pump (205) is installed on the top of the rectangular plate (110).

9. The transparent PET masterbatch screening device according to claim 8, characterized in that: The first water pump (205) is electrically connected to the controller (111), the second water pump (206) is installed on the top of the rectangular plate (110), the second water pump (206) is electrically connected to the controller (111), the two electric valves (211) are both electrically connected to the controller (111), and the driver (217) is electrically connected to the controller (111).

10. A screening method for a transparent PET masterbatch screening device, characterized in that: The transparent PET masterbatch screening device according to claim 9 is used, comprising the following steps: S1. When transparent PET masterbatch needs to be screened, the screen (105) is vibrated by using the cooperation of the controller (111), the vibration motor (112), the housing (103), the two connecting plates (104), the bracket (101), the four pillars (102), the four springs (108), the four sets of mounting blocks (107) and the four rectangular blocks (109). Then, a proper amount of water is transported into the double-hole box (207) by using the cooperation of the controller (111), the second water pump (206), the two hoses (213), the water tank (201) and the one-way valve (216). Then, a proper amount of PET masterbatch is slowly released to the position just above the housing (103) and close to the other side. S2. When the PET masterbatch contacts the vibrating screen (105), the PET masterbatch can be screened under the action of the vibrating screen (105). At this time, the PET masterbatch that meets the required size will enter the inside of the double-hole box (207). At the same time, the qualified PET masterbatch will sink into the water inside the double-hole box (207), while the defective PET masterbatch will float on the water surface inside the double-hole box (207). When the appropriate amount of PET masterbatch has completed the size screening, the controller (111), the driver (217), the two drive motors (215), the two rotating rods (208) and the double-hole box (207) are used to drive the two porous plates (209) to rotate towards each other until the two porous plates (209) are rotated (90) degrees. S3, then using the handle (218), one of the round rods (219), the corresponding bearing and the U-shaped frame (202) to rotate the double-hole box (207), at which time the rotating double-hole box (207) will release the defective PET masterbatch and part of the water floating on the water surface inside the double-hole box (207) into the interior of the filter shell (210), and at the same time, the rotating double-hole box (207) will retain the qualified PET masterbatch inside the double-hole box (207) under the cooperation of the two porous plates (209) and the two rotating rods (208), and at the same time, the water entering the interior of the filter shell (210) will flow into the interior of the box body (204), while the defective PET masterbatch will flow into the interior of the filter shell (210), and then the double-hole box (207) will be reset to its original position; S4. Then, the controller (111), the two electric valves (211), the first water pump (205), the two connecting pipes (212) and the three-way pipe (214) are used to transport the water inside the double-hole box (207) and the water inside the box body (204) to the inside of the water tank (201). At this time, the qualified PET masterbatch inside the double-hole box (207) is retained inside the double-hole box (207) with the cooperation of the filter plate (220). Then, the controller (111), the driver (217), the two driving motors (215), the two rotating rods (208) and the double-hole box (207) are used to drive the two porous plates (209) to reset and move, and then the qualified PET masterbatch is removed from the inside of the double-hole box (207).

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