Plastic granulator capable of screening plastic particles

Abstract

The utility model relates to the technical field of plastic granulation equipment, and discloses a plastic granulator capable of screening plastic granules, which comprises a plastic granulator body, support legs are fixedly mounted at the bottom of the plastic granulator body, a water cooling component is arranged on one side of the plastic granulator body, and a water outlet is formed in the other side of the plastic granulator body. And a screening assembly is arranged on the other side of the water cooling assembly. High-temperature plastic particles produced by the plastic granulator body enter the cooling box through the feed port of the cooling box and fall on the guide plate, and meanwhile, water in the water storage tank is pumped by the pump, enters the water outlet pipe through the water pumping pipe, then flows into the connecting water tank and finally is sprayed out from the spray head, so that the cooling effect is improved. The plastic particles on the material guide plate are cooled by fine water mist, the cooled water flows back to the water storage tank through the water through holes in the material guide plate, water recycling is achieved, the water-cooled plastic particles slide into the screening assembly from the material guide plate, and the effects of cooling the plastic particles and facilitating follow-up screening are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic granulation equipment, specifically a plastic granulator capable of screening plastic particles. Background Technology

[0002] In the plastics processing industry, plastic granulation is a crucial step in processing waste or raw plastics into granules of uniform size. With the continuous expansion of the applications of plastic products and increasingly stringent quality requirements, traditional plastic granulators have revealed numerous limitations.

[0003] After plastic undergoes high-temperature plasticizing and extrusion molding in a granulator, the granules reach extremely high temperatures. If cooling is not timely and effective, it will not only affect the subsequent processing performance of the plastic granules, leading to problems such as granule adhesion and deformation, thus reducing product qualification rates, but also pose safety hazards during storage and transportation due to residual heat accumulation, such as spontaneous combustion, seriously threatening the safety of the production environment and company property. Furthermore, the lack of an efficient cooling system will significantly reduce production efficiency, as the high-temperature granules require a long time to cool naturally before entering the next process, extending the production cycle. In addition, ordinary screening equipment is usually simple in structure and single in function, unable to achieve fine grading of plastic granules on a single machine. Multiple screening machines need to be connected in series or multiple screening operations are required, which not only increases equipment costs and floor space, but also easily leads to granule contamination and loss due to multiple transfers, reducing production efficiency and product quality stability. Utility Model Content

[0004] The purpose of this invention is to provide a plastic granulator that can screen plastic particles, thereby facilitating the screening of plastic particles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plastic granulator capable of screening plastic granules, comprising a plastic granulator body, a support leg fixedly installed at the bottom of the plastic granulator body, a water cooling component provided on one side of the plastic granulator body, and a screening component provided on the other side of the water cooling component.

[0006] Preferably, the water-cooling assembly includes: a water storage tank disposed on one side of the plastic granulator body; and a cooling tank disposed directly above the water storage tank.

[0007] Preferably, the front of the water storage tank is connected to a water inlet pipe, and the other end of the water inlet pipe is threaded to a pipe cap. The top of the water storage tank is connected to a connecting funnel, the top of the connecting funnel is connected to a cooling box, a filter plate is provided inside the connecting funnel, a guide plate is fixedly installed inside the cooling box, a feed inlet is opened on one side of the cooling box, and a discharge outlet is opened on the other side of the cooling box.

[0008] The connecting funnel serves as a connecting channel between the cooling tank and the water storage tank, allowing the cooled water to flow smoothly back to the water storage tank, thus realizing water recycling, improving water resource utilization, and reducing water waste.

[0009] Preferably, the cooling box is connected to the plastic granulator body through the feed inlet, one side of the guide plate extends through the discharge port, and water passage holes are opened on the surface of the guide plate. A pump is fixedly installed on the front of the cooling box, and a water pump pipe is connected to the input end of the pump. The other end of the water pump pipe is connected to a water storage tank, and a water outlet pipe is connected to the output end of the pump. The other end of the water outlet pipe extends through the top of the outer wall of the cooling box and extends to the top of the inner wall of the cooling box, and is connected to a connecting water tank. Spray nozzles are evenly connected to the bottom of the connecting water tank.

[0010] The pump, as the power core of the cooling circulation system, draws water from the storage tank to the outlet pipe, then delivers it to the connecting tank and sprays it out as a fine mist from the nozzle. This mist is evenly sprayed onto the surface of the plastic granules on the guide plate. Due to the large temperature difference between the mist and the high-temperature granules, the heat is quickly carried away from the granules through heat exchange, achieving efficient cooling.

[0011] Preferably, the screening component includes a base plate disposed on the other side of the water-cooling component.

[0012] Preferably, a support plate is symmetrically fixedly installed at the bottom of the base plate, and side plates are symmetrically fixedly installed at the top of the base plate. A baffle is fixedly installed between the side plates, and the top of the baffle is fixedly connected to the bottom of the guide plate. A connecting frame is fixedly fitted inside the base plate at equal intervals. A screening cylinder one, a screening cylinder two, and a screening cylinder three are movably arranged between the side plates. The screening cylinder one is located on one side of the baffle, and the screening cylinder two is located between the screening cylinder one and the screening cylinder three.

[0013] The screening cylinders 1, 2, and 3 arranged between the side plates form a multi-stage screening system.

[0014] Preferably, the outer wall of the first screening cylinder has a feed inlet 1 equidistantly spaced around its circumference, the outer wall of the second screening cylinder has a feed inlet 2 equidistantly spaced around its circumference, and the outer wall of the third screening cylinder has a feed inlet 3 equidistantly spaced around its circumference. The size of the feed inlet 1 is smaller than the size of the feed inlet 2, and the size of the feed inlet 2 is smaller than the size of the feed inlet 3. The two ends of the first, second, and third screening cylinders respectively movably penetrate the inner side of the side plate and extend to the outer side of the side plate, and are rotatably connected to the side plate through bearings. A connecting shaft is fixedly installed at one end of the third screening cylinder, and a motor is fixedly installed on the outer side of the side plate. The output end of the motor is connected to the other end of one of the connecting shafts. Rotating shafts are evenly arranged between the side plates. One end of each rotating shaft movably penetrates the inner side of the side plate and extends to the outer side of the side plate, and is rotatably connected to the side plate through bearings.

[0015] As the feed inlet sizes of screening cylinders one, two, and three increase sequentially, plastic particles of different sizes can be accurately graded as they pass through the screening cylinders in sequence.

[0016] Preferably, the other end of the rotating shaft is rotatably connected to another side plate via a bearing. A guide roller is fixedly sleeved on the outer wall of the rotating shaft. Three guide rollers are respectively arranged on one side of screening cylinder one, screening cylinder two, and screening cylinder three. A pulley one is fixedly sleeved on the outer wall of the connecting shaft. A pulley two and a gear are fixedly sleeved on the outer wall of one end of the rotating shaft. The pulley two is arranged between the gear and the side plate. The pulley one and pulley two are connected by belt drive. The gears are connected by tooth chain drive. The bottoms of screening cylinder one, screening cylinder two, and screening cylinder three are in contact with the tops of the three connecting frames.

[0017] The motor drives the connecting shaft to rotate, and the first pulley on the connecting shaft drives the second pulley on the rotating shaft to rotate via a belt, thereby causing the rotating shaft to rotate. At the same time, the gears are connected by a toothed chain drive, realizing the synchronous rotation of screening cylinder one, screening cylinder two and screening cylinder three.

[0018] This utility model provides a plastic granulator capable of screening plastic granules. It has the following beneficial effects:

[0019] (1) The high-temperature plastic granules produced by the plastic granulator body enter the cooling box through the feed port of the cooling box and fall onto the guide plate. At the same time, the water in the storage tank is pumped out by the pump, enters the outlet pipe through the water pumping pipe, flows into the connecting water tank, and finally sprays out from the nozzle to form a fine water mist to cool the plastic granules on the guide plate. The cooled water flows back to the storage tank through the water passage on the guide plate to realize the recycling of water. After being cooled by water, the plastic granules slide from the guide plate into the screening component to achieve the effect of cooling the plastic granules and facilitating subsequent screening.

[0020] (2) This utility model starts with a motor, which drives the connecting shaft connected to it to rotate. The connecting shaft drives the three screening cylinders to rotate. The pulley on the connecting shaft drives the pulley on the rotating shaft to rotate through the belt, which in turn drives the rotating shaft to rotate. The rotating shaft drives the guide roller on its outer wall to rotate. The guide roller provides auxiliary support and guidance for the rotation of the screening cylinder. At the same time, the gear on the rotating shaft is linked through the gear chain, so that the three screening cylinders, screening cylinder one, screening cylinder two and screening cylinder three, rotate synchronously, so as to achieve the effect of successively screening plastic particles of different sizes. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a cross-sectional view of the water-cooled component structure of this utility model;

[0023] Figure 3 This is a cross-sectional view of the screening component structure of this utility model;

[0024] Figure 4 This is a rear view of the structure of the screening component of this utility model.

[0025] In the diagram: 1. Plastic granulator body; 2. Support legs; 3. Water cooling assembly; 4. Screening assembly.

[0026] 311 Water storage tank, 312 Water inlet pipe, 313 Pipe cover, 314 Connecting funnel, 315 Cooling tank, 316 Material guide plate, 317 Pump, 318 Filter plate, 319 Pumping pipe, 3111 Water outlet pipe, 3112 Connecting water tank, 3113 Nozzle;

[0027] 411 Base plate, 412 Side plate, 413 Baffle, 414 Support plate, 415 Screening cylinder one, 416 Screening cylinder two, 417 Screening cylinder three, 418 Connecting frame, 419 Rotating shaft, 4111 Guide roller, 4112 Connecting shaft, 4113 Motor, 4114 Belt pulley one, 4115 Belt pulley two, 4116 Belt, 4117 Gear, 4118 Toothed chain. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example

[0030] A preferred embodiment of the plastic granulator capable of screening plastic particles provided by this utility model is, for example... Figure 1-4 As shown: A plastic granulator capable of screening plastic granules includes a plastic granulator body 1, a support leg 2 fixedly installed at the bottom of the plastic granulator body 1, a water cooling assembly 3 arranged on one side of the plastic granulator body 1, and a screening assembly 4 arranged on the other side of the water cooling assembly 3. The water cooling assembly 3 includes: a water storage tank 311, arranged on one side of the plastic granulator body 1; and a cooling box 315, arranged directly above the water storage tank 311. A water inlet pipe 312 is connected to the front of the water storage tank 311, and a pipe cap 313 is threaded to the other end of the water inlet pipe 312. A connecting funnel 314 is connected to the top of the water storage tank 311, and the top of the connecting funnel 314 is connected to the cooling box 315. A filter plate 318 is arranged inside the connecting funnel 314, and a filter plate 318 is fixedly installed inside the cooling box 315. The cooling box 315 has a guide plate 316, an inlet on one side and an outlet on the other side. The cooling box 315 is connected to the plastic granulator body 1 through the inlet. The outlet is penetrated by one side of the guide plate 316. Water passage holes are opened on the surface of the guide plate 316. A pump 317 is fixedly installed on the front of the cooling box 315. A water pump pipe 319 is connected to the input end of the pump 317. The other end of the water pump pipe 319 is connected to the water storage tank 311. A water outlet pipe 3111 is connected to the output end of the pump 317. The other end of the water outlet pipe 3111 penetrates the top of the outer wall of the cooling box 315 and extends to the top of the inner wall of the cooling box 315. A connecting water tank 3112 is connected to the connecting water tank 3112. Spray nozzles 3113 are evenly connected to the bottom of the connecting water tank 3112.

[0031] Furthermore, in this embodiment, the high-temperature plastic granules produced by the plastic granulator body 1 enter the cooling box 315 through the feed inlet and fall onto the guide plate 316. At the same time, water in the water storage tank 311 is drawn by the pump 317, enters the outlet pipe 3111 through the water pumping pipe 319, flows into the connecting water tank 3112, and finally sprays out from the nozzle 3113, forming a fine water mist to cool the plastic granules on the guide plate 316. The cooled water flows back to the water storage tank 311 through the water passage on the guide plate 316, realizing the recycling of water. When the water in the water storage tank 311 is insufficient, the pipe cover 313 can be unscrewed to add water to the water storage tank 311 through the water inlet pipe 312. The filter plate 318 inside the connecting funnel 314 can filter the water to prevent impurities from entering the cooling system and affecting the cooling effect and normal operation of the nozzle. After being cooled by water, the plastic granules slide from the guide plate 316 into the screening component 4. Example

[0032] Based on Embodiment 1, a preferred embodiment of the plastic granulator capable of screening plastic particles provided by this utility model is, for example... Figure 1-4As shown: The screening assembly 4 includes: a base plate 411, which is disposed on the other side of the water-cooling assembly 3; a support plate 414 is symmetrically fixedly installed on the bottom of the base plate 411, and side plates 412 are symmetrically fixedly installed on the top of the base plate 411. A baffle 413 is fixedly installed between the side plates 412, and the top of the baffle 413 is fixedly connected to the bottom of the guide plate 316. A connecting frame 418 is fixedly fitted inside the base plate 411 at equal intervals. Screening cylinder 1 415, screening cylinder 2 416, and screening cylinder 3 417 are movably disposed between the side plates 412. Screening cylinder 1 415 is disposed on one side of the baffle 413, and screening cylinder 2 416 is disposed on the other side of the baffle 413. A screen is positioned between screening cylinder 1 (415) and screening cylinder 3 (417). Screening cylinder 1 (415) has a feed inlet 1 equidistantly spaced on its outer circumference; screening cylinder 2 (416) has a feed inlet 2 equidistantly spaced on its outer circumference; and screening cylinder 3 (417) has a feed inlet 3 equidistantly spaced on its outer circumference. The size of feed inlet 1 is smaller than that of feed inlet 2, and the size of feed inlet 2 is smaller than that of feed inlet 3. Both ends of screening cylinders 1 (415), 2 (416), and 3 (417) movably penetrate the inner side of side plate 412 and extend to the outer side of side plate 412, and are rotatably connected to side plate 412 via bearings. One end of screening cylinder 3 (417) is fixed. A connecting shaft 4112 is fixedly installed on the side plate 412. A motor 4113 is fixedly installed on the outer side of the side plate 412. The output end of the motor 4113 is connected to the other end of one of the connecting shafts 4112. Rotating shafts 419 are evenly arranged between the side plates 412. One end of the rotating shaft 419 movably passes through the inner side of the side plate 412 and extends to the outer side of the side plate 412, and is rotatably connected to the side plate 412 through a bearing. The other end of the rotating shaft 419 is rotatably connected to another side plate 412 through a bearing. A guide roller 4111 is fixedly sleeved on the outer wall of the rotating shaft 419. Three guide rollers 4111 are respectively arranged on the screening cylinder 415. On one side of screening cylinder 2 416 and screening cylinder 3 417, a pulley 1 4114 is fixedly sleeved on the outer wall of the connecting shaft 4112. A pulley 2 4115 and a gear 4117 are fixedly sleeved on the outer wall of one end of the rotating shaft 419. The pulley 2 4115 is located between the gear 4117 and the side plate 412. The pulley 1 4114 and the pulley 2 4115 are connected by a belt 4116. The gears 4117 are connected by a toothed chain 4118. The bottoms of screening cylinder 1 415, screening cylinder 2 416 and screening cylinder 3 417 are in contact with the tops of the three connecting frames 418 respectively.

[0033] Furthermore, in this embodiment, the motor 4113 starts, driving the connected shaft 4112 to rotate. The connected shaft 4112 drives the screening cylinder 417 to rotate. The pulley 4114 on the connected shaft 4112 drives the pulley 4115 on the rotating shaft 419 to rotate via the belt 4116, thereby causing the rotating shaft 419 to rotate. The rotating shaft 419 drives the guide roller 4111 on its outer wall to rotate. The guide roller 4111 provides auxiliary support and guidance for the rotation of the screening cylinder. At the same time, the gear 4117 on the rotating shaft 419 is linked through the gear chain 4118, so that the three screening cylinders, screening cylinder 415, screening cylinder 416 and screening cylinder 417, rotate synchronously. The plastic particles first enter the screening cylinder 415. Since the feed hole of screening cylinder 415 is relatively small, the smaller size... Medium-sized particles enter the screening cylinder 415 through the first feed hole, while larger particles remain on the surface of the screening cylinder 415 and continue to roll forward. During their rotation, particles inside the screening cylinder 415 fall down through the first feed hole at the bottom and enter the collection box through the connecting frame 418. When passing through the second screening cylinder 416, medium-sized particles enter the interior of the second screening cylinder 416 through the second feed hole, and then enter the second collection box through the second feed hole and the second connecting frame 418. Larger particles continue to move forward through the second feed hole on the surface of the second screening cylinder 416, and finally enter the interior of the third screening cylinder 417 through the third feed hole on the surface of the third screening cylinder 417. Finally, they enter the third collection box through the third feed hole and the third connecting frame 418, completing the collection process.

[0034] During operation, the high-temperature plastic granules produced by the plastic granulator body 1 enter the cooling tank 315 through the feed inlet and fall onto the guide plate 316. Simultaneously, water in the water storage tank 311 is drawn by the pump 317, flows through the pump pipe 319 into the outlet pipe 3111, then into the connecting water tank 3112, and finally sprayed out from the nozzle 3113, forming a fine water mist to cool the plastic granules on the guide plate 316. The cooled water flows back to the water storage tank 311 through the water passages on the guide plate 316, achieving water recycling. When the water in the water storage tank 311 is insufficient, the pipe cover 313 can be unscrewed. Water is supplied to the water storage tank 311 through the inlet pipe 312. The filter plate 318 inside the funnel 314 filters the water to prevent impurities from entering the cooling system and affecting the cooling effect and normal operation of the nozzles. After being cooled by water, the plastic granules slide from the guide plate 316 into the screening assembly 4. The motor 4113 starts, driving the connected shaft 4112 to rotate. The connected shaft 4112 drives the screening cylinder 417 to rotate. The pulley 4114 on the connected shaft 4112 drives the pulley 4115 on the rotating shaft 419 to rotate via the belt 4116, thereby causing the rotating shaft 419 to rotate. The rotating shaft 419 drives the outer... The guide roller 4111 on the wall rotates, providing auxiliary support and guidance for the rotation of the screening cylinder. Simultaneously, the gear 4117 on the rotating shaft 419 is linked by the gear chain 4118, causing the three screening cylinders—screening cylinder one 415, screening cylinder two 416, and screening cylinder three 417—to rotate synchronously. Plastic particles first enter screening cylinder one 415. Due to the smaller size of the feed hole one of screening cylinder one 415, smaller particles enter the interior of screening cylinder one 415 through the feed hole one, while larger particles remain on the surface of screening cylinder one 415 and continue rolling forward into the interior of screening cylinder one 415. During its rotation, the particles fall downwards through the bottom feed hole 1, enter the collection box through the connecting frame 418, and when passing through the screening cylinder 2 416, medium-sized particles enter the interior of the screening cylinder 2 416 through the feed hole 2, and then enter the second collection box through the feed hole 2 and the second connecting frame 418. Larger particles continue to move forward through the feed hole 2 on the surface of the screening cylinder 2 416, and finally enter the interior of the screening cylinder 3 417 through the feed hole 3 on the surface of the screening cylinder 3 417, and finally enter the third collection box through the feed hole 3 and the third connecting frame 418, completing the collection.

Claims

1. A plastic granulator capable of screening plastic granules, comprising a plastic granulator body (1), characterized in that: The bottom of the plastic granulator body (1) is fixedly equipped with a support leg (2), a water cooling component (3) is provided on one side of the plastic granulator body (1), and a screening component (4) is provided on the other side of the water cooling component (3).

2. The plastic granulator capable of screening plastic granules according to claim 1, characterized in that: The water-cooling component (3) includes: A water storage tank (311) is located on one side of the plastic granulator body (1); The cooling tank (315) is located directly above the water storage tank (311).

3. A plastic granulator capable of screening plastic granules according to claim 2, characterized in that: The front of the water storage tank (311) is connected to a water inlet pipe (312), and the other end of the water inlet pipe (312) is threaded to a pipe cap (313). The top of the water storage tank (311) is connected to a connecting funnel (314), and the top of the connecting funnel (314) is connected to a cooling box (315). A filter plate (318) is provided inside the connecting funnel (314), and a guide plate (316) is fixedly installed inside the cooling box (315). A feed inlet is provided on one side of the cooling box (315), and a discharge outlet is provided on the other side of the cooling box (315).

4. A plastic granulator capable of screening plastic granules according to claim 3, characterized in that: The cooling box (315) is connected to the plastic granulator body (1) through the feed port. The discharge port is penetrated on one side of the guide plate (316). Water passage holes are opened on the surface of the guide plate (316). A pump (317) is fixedly installed on the front of the cooling box (315). A water pump (319) is connected to the input end of the pump (317). The other end of the water pump (319) is connected to the water storage tank (311). A water outlet pipe (3111) is connected to the output end of the pump (317). The other end of the water outlet pipe (3111) penetrates the top of the outer wall of the cooling box (315) and extends to the top of the inner wall of the cooling box (315). A connecting water tank (3112) is connected to it. Spray nozzles (3113) are evenly connected to the bottom of the connecting water tank (3112).

5. A plastic granulator capable of screening plastic granules according to claim 1, characterized in that: The screening component (4) includes: The base plate (411) is located on the other side of the water-cooling assembly (3).

6. A plastic granulator capable of screening plastic granules according to claim 5, characterized in that: Support plates (414) are symmetrically fixedly installed at the bottom of the base plate (411), and side plates (412) are symmetrically fixedly installed at the top of the base plate (411). Baffles (413) are fixedly installed between the side plates (412). The top of the baffles (413) is fixedly connected to the bottom of the guide plate (316). Connecting frames (418) are fixedly fitted at equal intervals inside the base plate (411). Screening cylinder one (415), screening cylinder two (416) and screening cylinder three (417) are movably arranged between the side plates (412). Screening cylinder one (415) is arranged on one side of the baffle (413), and screening cylinder two (416) is arranged between screening cylinder one (415) and screening cylinder three (417).

7. A plastic granulator capable of screening plastic granules according to claim 6, characterized in that: The outer wall of the first screening cylinder (415) is provided with an equal-distance feed inlet 1, the outer wall of the second screening cylinder (416) is provided with an equal-distance feed inlet 2, and the outer wall of the third screening cylinder (417) is provided with an equal-distance feed inlet 3. The size of the first feed inlet is smaller than the size of the second feed inlet, and the size of the second feed inlet is smaller than the size of the third feed inlet. The two ends of the first screening cylinder (415), the second screening cylinder (416), and the third screening cylinder (417) respectively movably penetrate the inner side of the side plate (412) and extend to the outer side of the side plate (412), and are connected by bearings. Rotary connection with side plate (412), one end of the screening cylinder (417) is fixedly installed with a connecting shaft (4112), a motor (4113) is fixedly installed on the outside of the side plate (412), the output end of the motor (4113) is connected to the other end of one of the connecting shafts (4112), and rotating shafts (419) are evenly arranged between the side plates (412). One end of the rotating shaft (419) movably passes through the inside of the side plate (412) and extends to the outside of the side plate (412), and is rotatably connected to the side plate (412) through a bearing.

8. A plastic granulator capable of screening plastic granules according to claim 7, characterized in that: The other end of the rotating shaft (419) is rotatably connected to another side plate (412) via a bearing. A guide roller (4111) is fixedly sleeved on the outer wall of the rotating shaft (419). Three guide rollers (4111) are respectively arranged on one side of screening cylinder one (415), screening cylinder two (416), and screening cylinder three (417). A pulley one (4114) is fixedly sleeved on the outer wall of the connecting shaft (4112). A pulley two (4114) is fixedly sleeved on the outer wall of one end of the rotating shaft (419). 115) and gear (4117), the second pulley (4115) is disposed between the gear (4117) and the side plate (412), the first pulley (4114) and the second pulley (4115) are connected by a belt (4116), the gears (4117) are connected by a toothed chain (4118), and the bottom of the first screening cylinder (415), the second screening cylinder (416) and the third screening cylinder (417) respectively contact the top of the three connecting frames (418).

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