Granulating device for EPP foaming material

Abstract

A cutting device for EPP foaming materials comprises a box body, a feeding roller set is arranged on the inner side of a feeding port in the box body, and a hob is arranged on one side of the feeding roller set; a double-output-shaft motor is further arranged in the box body, a first transmission wheel and a second transmission wheel are arranged on two output shafts respectively, and the first transmission wheel is meshed with an eighth transmission wheel installed at one end of the hob. A third transmission wheel is arranged at the input end of the speed change gear box and used for being meshed with the second transmission wheel, and a fourth transmission wheel is arranged at the output end of the speed change gear box and used for outputting decelerated power; and the transmission gear box is used for transmitting the material from the input end to the output end at a constant speed, the input end of the transmission gear box is provided with a fifth transmission wheel used for being meshed with the fourth transmission wheel, and the output end of the transmission gear box is provided with a sixth transmission wheel used for being meshed with a seventh transmission wheel on the feeding roller set so as to drive the feeding roller set to clamp the material to feed the material in the direction of the hobbing cutter. The rotating speed of the hob and the rotating speed of the feeding roller can be independently controlled, and the production efficiency of product particles is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of EPP foam material production equipment, and particularly relates to a granulating device for EPP foam materials. Background Art

[0002] Polypropylene foam material, abbreviated as EPP, is a foam material obtained by supercritical carbon dioxide autoclave foaming technology with polypropylene as the base material under high temperature and high pressure conditions, and has continuous independent mesopores inside the substrate. Its independent cell units provide good support for its excellent use strength.

[0003] In the EPP production process, in order to obtain foamed particles with uniform state, the plastic polypropylene raw material after extrusion and mixing must be changed into a strip of a certain thickness by means of extrusion and drawing, and then the strip is evenly cut into EPP foam microparticles of a certain length and weight by a granulator. Traditional granulating equipment cannot well control the granulating size, size and appearance, and often there are problems such as thick and thin filaments, beveled particles and wire jamming caused by too small granulation, which greatly affects the production efficiency of products. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a granulating device for EPP foam materials, which can independently control the rotation speeds of the hob and the feeding roller, independently control the length and weight of the EPP foam microparticles, and greatly improve the production efficiency of product microparticles.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a granulating device for EPP foam materials, including a box body, an inlet is arranged at the upper part of the box body, a feeding roller group is arranged inside the inlet, a hob is arranged on one side of the feeding roller group, and the hob is rotationally supported inside the box body;

[0006] A double-output shaft motor is further arranged inside the box body. A first transmission wheel and a second transmission wheel are respectively arranged on the two output shafts of the double-output shaft motor. The first transmission wheel is meshed and connected with an eighth transmission wheel installed at one end of the hob to drive the hob to rotate;

[0007] A speed change gearbox, a third transmission wheel is arranged at the input end of the speed change gearbox for meshing and connecting with the second transmission wheel, and a fourth transmission wheel is arranged at the output end of the speed change gearbox for outputting the decelerated power;

[0008] A transmission gearbox is used to transmit power from the input end to the output end at a constant speed. A fifth transmission wheel is arranged at the input end of the transmission gearbox for meshing and connecting with the fourth transmission wheel, and a sixth transmission wheel is arranged at the output end of the transmission gearbox for meshing and connecting with a seventh transmission wheel on the feeding roller group to drive the feeding roller group to clamp the material and feed it towards the hob.

[0009] The radii of the first driving wheel, the second driving wheel, the third driving wheel, the fourth driving wheel, the fifth driving wheel, the sixth driving wheel, the seventh driving wheel and the eighth driving wheel are R1, R2, R3, R4, R5, R6, R7, and R8 respectively, and the relationship between the radii is: R1:R2:R3:R4:R5:R6:R7:R8 = 5:6:3:5:5:3:4:6.

[0010] The first driving wheel, the second driving wheel, the third driving wheel, the fourth driving wheel, the fifth driving wheel, the sixth driving wheel, the seventh driving wheel and the eighth driving wheel are all belt wheels or all sprocket wheels.

[0011] A purging and cooling air duct is installed on the top of the box body for blowing air onto the surface of the hob.

[0012] The cutting edge on the hob is obliquely opened, and the inclination angle of the cutting edge is 3°.

[0013] The feeding roller group includes an oppositely rotating feeding roller and a flexible roller. The feeding roller is a driving roller, and the seventh driving wheel is installed at one end thereof. The flexible roller is a driven roller.

[0014] The roller surface of the feeding roller is provided with patterns for increasing the friction force.

[0015] The roller surface of the flexible roller is a rubber layer.

[0016] A discharge channel is arranged in the box body below the hob. The discharge channel is obliquely arranged, and its lowest end is communicated with the discharge port on the box body. The discharge port is arranged opposite to the feed port.

[0017] The beneficial effects of the present utility model are as follows: The present utility model uses the feeding roller group to convey the extruded EPP strip, and cooperates with the rotation and cutting of the hob, so as to ensure the accurate control of the cutting length. By adjusting the ratio relationship of the radii between the driving gears, the independent adjustment of the rotation speed of the hob and the rotation speed of the feeding roller can be realized, and further the precise control of the cutting length can be realized.

[0018] The present utility model is also provided with a purging and cooling air duct, which can blow air onto the surface of the hob. On the one hand, it can clean the hob in time, and on the other hand, it can also blow air to cool the hob. In addition, cooling water can be introduced into the hob, and the circulating flow of the coolant can be used to more effectively cool the hob, extend the service life of the hob, and ensure the stable operation of the device.

[0019] The present utility model realizes the continuous operation of feeding and cutting through the cooperation of the hob, the feeding roller and the transmission system, and improves the cutting efficiency. Brief Description of the Drawings

[0020] Figure 1It is a structural schematic diagram of the present utility model;

[0021] Figure 2 It is a schematic diagram of the radius relationship of each pulley in the present utility model;

[0022] Markings in the figure: 1. Box body, 2. Hob, 3. Feeding roller, 4. Flexible roller, 5. Double-output shaft motor, 6. Speed-changing gearbox, 7. Gear transmission box, 8. Feeding port, 9. Blowing and cooling air duct;

[0023] F1. First driving wheel, F2. Second driving wheel, F3. Third driving wheel, F4. Fourth driving wheel, F5. Fifth driving wheel, F6. Sixth driving wheel, F7. Seventh driving wheel, F8. Eighth driving wheel. Specific embodiments

[0024] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it shall not be used as a basis for any limitation to the utility model.

[0025] Refer to the attached Figure 1 As shown, a pelletizing device for EPP foaming material includes a box body 1. An upper part of a side wall of the box body 1 is provided with a feeding port 8. Inside the box body 1 corresponding to the feeding port 8, a hob 2 is rotatably installed. Between the hob 2 and the feeding port 8, a feeding roller group is arranged. The feeding roller group includes a feeding roller 3 and a flexible roller 4. The feeding roller 3 and the flexible roller 4 rotate towards each other to clamp and convey materials to the hob 2. Inside the box body 1, a double-output shaft motor 5, a speed-changing gearbox 6 and a gear transmission box 7 are sequentially arranged from bottom to top. On both sides of the double-output motor 5, each is provided with an output shaft, and a driving wheel is installed on each output shaft, which are respectively a first driving wheel F1 and a second driving wheel F2; the speed-changing gearbox 6 can reduce the input speed through the cooperation of the internal gear group. The input end of the speed-changing gearbox 6 is connected with a third driving wheel F3 to input power, and the output end of the speed-changing gearbox 6 is connected with a fourth driving wheel F4 to output the decelerated power; the transmission gearbox 7 is used to convey power from one end to the other end at a constant rotational speed. The input end of the transmission gearbox 7 is connected with a fifth driving wheel F5, and the output end is connected with a sixth driving wheel F6; the feeding roller 3 of the feeding roller group is a driving roller, and the flexible roller 4 is a driven roller. One end of the feeding roller 3 is connected with a seventh driving wheel F7 to access power; one end of the hob 2 is connected with an eighth driving wheel F8 to access power.

[0026] The eighth driving wheel F8, the fifth driving wheel F5, the fourth driving wheel F4 and the first driving wheel F1 are arranged on the same side; the second driving wheel F2, the third driving wheel F3, the sixth driving wheel F6 and the seventh driving wheel F7 are arranged on the other side.

[0027] In the present utility model, the power transmission route is as follows: The first transmission wheel F1 is meshed and connected with the eighth transmission wheel F8 at the end of the hob 2 through a belt or a chain to drive the hob 2 to rotate; the second transmission wheel F2 is meshed and connected with the third transmission wheel F3 through a belt or a chain; the fourth transmission wheel F4 is meshed and connected with the fifth transmission wheel F5 through a belt or a chain; the sixth transmission wheel F6 is meshed and connected with the seventh transmission wheel F7 through a belt or a chain. The double-output shaft motor 5 drives the first transmission wheel F1 and the second transmission wheel F2 to rotate. The first transmission wheel F1 drives the eighth transmission wheel F8 to rotate, and then the eighth transmission wheel F8 drives the hob 2 to cut the material; the second transmission wheel F2 transmits the power to the third transmission wheel F3, and after deceleration, it is transmitted to the fifth transmission wheel F5 by the fourth transmission wheel F4, and then through the transmission of the gear transmission box 7, it is conveyed to the sixth transmission wheel F6 while keeping the rotational speed unchanged. The sixth transmission wheel F6 drives the feeding roller 3 to rotate through the seventh transmission wheel F7, realizing the feeding of the material to the hob 2.

[0028] Preferably, the radii of the first transmission wheel F1, the second transmission wheel F2, the third transmission wheel F3, the fourth transmission wheel F4, the fifth transmission wheel F5, the sixth transmission wheel F6, the seventh transmission wheel F7, and the eighth transmission wheel F8 are R1, R2, R3, R4, R5, R6, R7, and R8 respectively, and the relationship between the radii is: R1:R2:R3:R4:R5:R6:R7:R8 = 5:6:3:5:5:3:4:6. By adjusting the gear set in the speed change gearbox, the speed ratio of the fourth transmission wheel and the fifth transmission wheel can be adjusted, thereby controlling the rotation rate of the feeding roller, controlling the length of the material entering the inside of the pelletizing device per unit time, and thus controlling the length of pelletizing.

[0029] Preferably, a purging and cooling air duct 9 is installed at the top of the box body 1 for blowing air onto the surface of the hob 2, which can not only clean the hob 2 but also reduce the working temperature of the hob 2 and extend the service life of the hob 2.

[0030] Preferably, coolant can be introduced into the hob 2 to further better control the temperature of the hob 2 and make the operation of the device more stable.

[0031] Preferably, the cutting edge on the hob 2 is obliquely opened, and the inclination angle of the cutting edge is 3°. The cutting edge is formed by welding alloy strips on the surface of the hob.

[0032] Preferably, the surface of the feeding roller is provided with patterns to increase the friction between the contact surface and the material, and under the synergistic effect with the flexible roller, the material can be continuously and stably conveyed to the position of the hob. The roller surface of the flexible roller is a rubber layer to avoid damaging the material.

[0033] The upper part of the box body 1 is also provided with a discharging channel, which is located below the hob 2. The discharging channel is inclined, and its lowest end is communicated with the discharging port on the side wall of the box body 1. The discharging port and the feeding port are respectively arranged on two opposite side walls of the box body 1. The materials cut by the hob 2 slide out of the box body 1 from the discharging port along the inclined surface of the discharging channel.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that the specific implementation manners of the present invention can be modified or equivalently replaced by referring to the above embodiments. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the protection scope of the claims pending for approval.

Claims

1. A pelletizing device for EPP foaming material, characterized in that: It includes a box body. There is a feed inlet arranged at the upper part of the box body. Inside the feed inlet, there is a feed roller group. One side of the feed roller group is provided with a hob, and the hob is rotationally supported inside the box body. Inside the box body, there is also provided: a double-output shaft motor. A first transmission wheel and a second transmission wheel are respectively arranged on the two output shafts of the double-output shaft motor. The first transmission wheel is meshed and connected with an eighth transmission wheel installed at one end of the hob to drive the hob to rotate. A speed-changing gearbox. A third transmission wheel is provided at the input end of the speed-changing gearbox for meshing and connecting with the second transmission wheel. A fourth transmission wheel is provided at the output end of the speed-changing gearbox for outputting the decelerated power. A transmission gearbox for transmitting power from the input end to the output end at a constant speed. A fifth transmission wheel is provided at the input end of the transmission gearbox for meshing and connecting with the fourth transmission wheel. A sixth transmission wheel is provided at the output end of the transmission gearbox for meshing and connecting with a seventh transmission wheel on the feed roller group to drive the feed roller group to clamp the material and feed it towards the hob.

2. The pelletizing device for EPP foaming material according to claim 1, characterized in that: The radii of the first transmission wheel, the second transmission wheel, the third transmission wheel, the fourth transmission wheel, the fifth transmission wheel, the sixth transmission wheel, the seventh transmission wheel and the eighth transmission wheel are R1, R2, R3, R4, R5, R6, R7, R8 respectively, and the relationship between the radii is: R1:R2:R3:R4:R5:R6:R7:R8 = 5:6:3:5:5:3:4:

6.

3. The pelletizing device for EPP foaming material according to claim 1, characterized in that: The first transmission wheel, the second transmission wheel, the third transmission wheel, the fourth transmission wheel, the fifth transmission wheel, the sixth transmission wheel, the seventh transmission wheel and the eighth transmission wheel are all belt wheels or all sprockets.

4. The pelletizing device for EPP foaming material according to claim 1, characterized in that: A purging and cooling air duct is installed at the top of the box body for blowing air onto the surface of the hob.

5. The pelletizing device for EPP foaming material according to claim 1, characterized in that: The cutting edge on the hob is obliquely opened, and the inclination angle of the cutting edge is 3°.

6. The pelletizing device for EPP foaming material according to claim 1, characterized in that: The feed roller group includes a feed roller and a flexible roller that rotate towards each other. The feed roller is a driving roller, and the seventh transmission wheel is installed at one end of it. The flexible roller is a driven roller.

7. The pelletizing device for EPP foaming material according to claim 6, wherein: The roller surface of the feed roller is provided with patterns for increasing friction.

8. The pelletizing device for EPP foaming material according to claim 6, characterized in that: The roller surface of the flexible roller is a rubber layer.

9. The pelletizing device for EPP foaming material according to claim 1, characterized in that: A discharge channel is arranged inside the box body below the hob. The discharge channel is obliquely arranged, and its lowest end is communicated with a discharge port on the box body. The discharge port is arranged opposite to the feed inlet.

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