Underwater pelletizing device of PET (Polyethylene Terephthalate) pelletizer

Abstract

The utility model relates to the technical field of PET material pelletizing, in particular to an underwater pelletizing device of a PET pelletizer, which comprises a fixing plate, an adjusting hole is arranged on the fixing plate, a locking screw rod is fixedly mounted in the adjusting hole, a sliding block is fixedly mounted on one side of the fixing plate far away from the adjusting hole, a sliding hole is arranged on the sliding block, and the locking screw rod is fixedly mounted in the sliding hole. A driving mechanism is arranged at the top end of the fixing plate, the driving mechanism comprises a driving motor, a driving shaft is fixedly installed at the driving end of the driving motor, and a coupler is fixedly installed on the driving shaft. According to the cooling device, the phenomenon that adhesion is generated after grain cutting due to the fact that a PET material cannot be cooled during extrusion is avoided, the driving motor, the box body and the refrigeration structure are of a split structure, the blades can be quickly disassembled and disassembled when damaged, the box body can be integrally and quickly disassembled and replaced during urgent production, and the phenomenon that the shutdown time is too long due to blade replacement is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to PET material cutting technology field, concretely underwater cutting device of PET granulator. BACKGROUND

[0002] Underwater cutting technology is the key link of PET granulation, and its core is to rapidly cool the melt and cut it into uniform particles through water cooling. However, PET material has high crystallinity, high viscosity and heat sensitivity, which puts high requirements on underwater cutting device.

[0003] However, the existing technology has the following significant defects: if the PET melt is not cooled sufficiently during the cutting process, a molten layer will remain on the surface, causing particles to stick together. Traditional devices have uneven water distribution or insufficient cooling efficiency, making it difficult to stabilize the cutting water temperature below 25℃ (PET glass transition temperature is about 70-80℃), and the sticking rate is generally more than 15%. In particular, in the processing of recycled PET (rPET), impurities and degradation products further exacerbate sticking, requiring additional release agents (such as silicone oil), increasing costs and environmental risks. The intrinsic viscosity (IV value) of PET melt is usually 0.72-1.0 dL / g, and the high viscosity of the melt generates a large shear resistance on the cutting knife. The hardness of traditional blade materials (such as ordinary high-speed steel) is insufficient, and the cutting edge becomes blunt after 4-8 hours of continuous operation, resulting in uneven cutting size (particle size fluctuation > ± 0.5mm). Frequent downtime for knife replacement not only reduces production efficiency (daily loss of 2-3 hours), but also incurs high labor maintenance costs. SUMMARY

[0004] The purpose of the utility model is to provide an underwater cutting device for a PET granulator to solve the problems raised in the background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] An underwater cutting device for a PET granulator includes a fixed plate with an adjustment hole, a locking screw fixedly installed in the adjustment hole, a sliding block fixedly installed on the side of the fixed plate away from the adjustment groove, a sliding hole opened in the sliding block, a driving mechanism provided at the top end of the fixed plate, the driving mechanism including a driving motor, a driving shaft fixedly installed at the driving end of the driving motor, and a shaft coupling fixedly installed on the driving shaft.

[0007] Preferably, the driving mechanism further includes a transmission shaft fixedly installed in the shaft coupling, and a rotating disc fixedly installed in the box body at the end of the transmission shaft away from the shaft coupling, and a blade fixedly installed on the rotating disc.

[0008] Preferably, the box is fixedly installed at the top end of the fixed plate with the driving motor, one side of the box is fixedly installed with a connecting plate, and the side of the box away from the connecting plate is fixedly installed with a water outlet joint.

[0009] Preferably, the box is fixedly installed at the top end of the fixed plate with the driving motor, one side of the box is fixedly installed with a connecting plate, and the side of the box away from the connecting plate is fixedly installed with a water outlet joint.

[0010] Preferably, the box is fixedly installed at the top end of the fixed plate with the driving motor, one side of the box is fixedly installed with a connecting plate, and the side of the box away from the connecting plate is fixedly installed with a water outlet joint.

[0011] Preferably, the box is fixedly installed at the top end of the fixed plate with the driving motor, one side of the box is fixedly installed with a connecting plate, and the side of the box away from the connecting plate is fixedly installed with a water outlet joint.

[0012] Compared with the prior art, the PET underwater pelletizing device has the beneficial effects that:

[0013] 1. The PET underwater pelletizing device can monitor the water temperature through the sensor joint, so that the semiconductor refrigerating plate can be controlled to perform secondary refrigeration when the water temperature is not up to standard, thereby ensuring the temperature of the water flow and avoiding the adhesion of PET materials after cutting due to the failure of cooling during PET material extrusion. 2. The PET underwater pelletizing device has a split structure of the driving motor, the box and the refrigeration structure, so that the box can be quickly disassembled and removed when the blade is damaged, and the box can be quickly removed and replaced in urgent production, thereby avoiding the long downtime caused by blade replacement. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] Figure 2 It is a structure schematic view of the driving motor and the box of the utility model;

[0016] Figure 3 It is a structure schematic view of the utility model quick cooling box;

[0017] Figure 4 It is a plane structure schematic view of the utility model quick cooling box.

[0018] In the figure: 101, fixed plate; 102, adjusting hole; 103, locking screw; 104, sliding block; 105, sliding hole; 106, driving mechanism; 201, driving motor; 202, driving shaft; 203, shaft coupling; 204, transmission shaft; 205, rotating disc; 206, blade; 301, box; 302, connecting plate; 303, water outlet joint; 304, water inlet joint; 305, water guide hose; 306, drain joint; 401, rapid cooling box; 402, cushion block; 403, sensor joint; 404, fin; 405, semiconductor refrigeration plate; 406, cooling fan. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0021] The underwater pellet cutting device of the PET pelletizer comprises a fixed plate 101, adjusting holes 102 are formed in the fixed plate 101, locking screws 103 are fixedly installed in the adjusting holes 102, sliding blocks 104 are fixedly installed on the side, away from the adjusting holes 102, of the fixed plate 101, sliding holes 105 are formed in the sliding blocks 104, driving mechanisms 106 are arranged at the top end of the fixed plate 101, the driving mechanisms 106 comprise driving motors 201, driving shafts 202 are fixedly installed at the driving end of the driving motors 201, and shaft couplings 203 are fixedly installed on the driving shafts 202.

[0022] Through the above scheme, the driving structure can be supported and fixed through the fixed plate, the locking screw can be fixed through the adjusting hole, the fixed plate can drive the driving structure to be fixed through the locking screw, the sliding block can drive the driving structure to slide and adjust through the sliding hole by installing the sliding block on the sliding rod, the driving shaft can be driven to rotate through the driving motor, thereby providing power for cutting, and the driving shaft can be connected through the shaft coupling.

[0023] In the embodiment, preferably, the driving mechanism 106 further comprises a transmission shaft 204, the transmission shaft 204 is fixedly installed in the shaft coupling 203, the transmission shaft 204 penetrates through the rotating disc 205 fixedly installed in the box 301 at the end, away from the shaft coupling 203, of the transmission shaft 204, and the blade 206 is fixedly installed on the rotating disc 205.

[0024] Through the above scheme, the driving motor can drive the transmission shaft to rotate when working, and the transmission shaft can drive the rotating disc to rotate, so that the blade rotates to cut the material extruded by the extruder.

[0025] In this embodiment, preferably, the box 301 is fixedly installed on the top end of the fixed plate 101 with the driving motor 201, one side of the box 301 is fixedly installed with a connecting plate 302, and the side of the box 301 away from the connecting plate 302 is fixedly installed with a water outlet joint 303.

[0026] Through the above scheme, the box can be fixed with the extruder through the connecting plate, and the extruded particles and water flow can be discharged through the water outlet joint.

[0027] In this embodiment, preferably, the box 301 is fixedly installed with a water inlet joint 304 on the side away from the water outlet joint 303, the water inlet joint 304 is fixedly installed with a water guide hose 305 on one side, and the water guide hose 305 is fixedly installed on a drainage joint 306.

[0028] Through the above scheme, cooling water can enter the box to cool and shape the extruded material through the water inlet joint, and the cooling water in the rapid cooling box can be guided into the box through the water guide hose.

[0029] In this embodiment, preferably, the drainage joint 306 is fixedly installed on one side of the rapid cooling box 401, the rapid cooling box 401 is fixedly installed with a cushion block 402 at the bottom end, and the rapid cooling box 401 is fixedly installed with a sensor joint 403 at the top end.

[0030] Through the above scheme, the cooling water can be discharged from the rapid cooling box through the drainage joint, the rapid cooling box can be supported and fixed through the cushion block, and the water flow can enter the cooling box through the sensor joint, and the temperature of the water flow can be monitored.

[0031] In this embodiment, preferably, the rapid cooling box 401 is fixedly installed with fins 404 inside, the fins 404 are fixedly installed on one side of a semiconductor refrigeration plate 405, and the rapid cooling box 401 is fixedly installed with a heat dissipation fan 406 on the right side inside.

[0032] Through the above scheme, the fins can dissipate cold energy through the semiconductor refrigeration plate, the fins can cool the water flow again, and the heat can be discharged through the heat dissipation fan when the semiconductor refrigeration plate works.

[0033] The underwater pellet cutting device of the PET pelletizer of the embodiment is used, the user connects the sliding block 104 with the slide rod of the support table through the sliding hole 105, so that the fixed plate 101 is installed, then the driving motor 201 and the box 301 are installed at the top end of the fixed plate 101, then the driving shaft 202 is docked with the transmission shaft 204 through the shaft coupling 203 and is fixed, after being fixed, the user pushes the box 301 and the driving motor 201 to be attached to the extruder, and is fixed through the connecting plate 302, after being fixed, the user passes through the locking screw 103 to penetrate the adjusting hole 102, so that the driving motor 201 and the box 301 keep temperature, at this time, the water inlet joint 304 is connected through the water guide hose 305 and the water outlet joint 306, after being connected, the sensor joint 403 and the water outlet joint 303 are connected to the circulating water tank respectively, when cutting the particles, the refrigeration device on the circulating water tank refrigerates the water in the water tank and is pumped into the rapid cooling tank 401 through the circulating pump, because the water is lost when flowing, the sensor joint 403 automatically monitors the water temperature when entering the rapid cooling tank 401, the sensor joint 403 is connected to the temperature sensor, therefore, when the water temperature is up to standard, the semiconductor refrigerating plate 405 is not started, and when the water temperature is not up to standard, the semiconductor refrigerating plate 405 is controlled to be powered on to work, when the semiconductor refrigerating plate 405 is powered on, one side is heated, the temperature is discharged through the heat dissipation fan 406, the other side is refrigerated to about 0 degrees, and the cold quantity is introduced into the rapid cooling tank 401 through the fin 404, so that the water in the rapid cooling tank 401 is cooled again, the cooled water flows into the box 301 through the water guide hose 305, so that the PET material extruded by the extruder is rapidly cooled, at the same time, the driving motor 201 drives the driving shaft 202 to rotate and drives the transmission shaft 204 to rotate through the shaft coupling 203, the rotation drives the rotating disc 205 to drive the blade 206 to cut the PET material extruded by the extruder into particles, and the particles are discharged through the water outlet joint 306 under the driving of the water flow.

[0034] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An underwater pellet cutting device of a PET pelletizer, characterized by: Including the fixed plate (101), the fixed plate (101) is opened with the adjusting hole (102), the locking screw (103) is fixedly installed in the adjusting hole (102), the fixed plate (101) is fixedly installed with the sliding block (104) away from the adjusting hole (102) side, the sliding hole (105) is opened on the sliding block (104), the fixed plate (101) top is provided with the drive mechanism (106), the drive mechanism (106) includes drive motor (201), the drive end of drive motor (201) is fixedly installed with drive shaft (202), the drive shaft (202) is fixedly installed with the shaft coupling (203).

2. An underwater pellet cutting device of a PET pelletizer according to claim 1, characterized in that: The drive mechanism (106) further includes transmission shaft (204), the transmission shaft (204) is fixedly installed in the shaft coupling (203), the transmission shaft (204) is fixedly installed with the rotary disc (205) in the box (301) inside away from the shaft coupling (203) one end, the rotary disc (205) is fixedly installed with blade (206).

3. An underwater pellet cutting device of a PET pelletizer according to claim 2, characterized in that: The box (301) and drive motor (201) are fixedly installed at the top of the fixed plate (101), the box (301) is fixedly installed with the connecting plate (302) on one side, the box (301) is fixedly installed with the water outlet joint (303) away from the connecting plate (302) side.

4. An underwater pellet cutting device of a PET pelletizer according to claim 3, characterized in that: The box (301) is fixedly installed with the water inlet joint (304) away from the water outlet joint (303) side, the water inlet joint (304) is fixedly installed with the water guide hose (305) on one side, the water guide hose (305) is fixedly installed on the drain joint (306).

5. An underwater pellet cutting device of a PET pelletizer according to claim 4, characterized in that: The drain joint (306) is fixedly installed on one side of the rapid cooling tank (401), the rapid cooling tank (401) is fixedly installed with the cushion block (402) at the bottom, the rapid cooling tank (401) is fixedly installed with the sensor joint (403) at the top.

6. An underwater pellet cutting device of a PET pelletizer according to claim 5, characterized in that: The rapid cooling tank (401) is fixedly installed with the fin (404) inside, the fin (404) is fixedly installed on one side of the semiconductor refrigeration plate (405), the rapid cooling tank (401) is fixedly installed with the heat dissipation fan (406) inside right side.

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