阅读说明：本技术 一种pet聚酯颗粒生产用挤出装置 (Extrusion device is used in production of PET polyester granule ) 是由 吴聪 于 2020-12-04 设计创作，主要内容包括：本发明公开了一种PET聚酯颗粒生产用挤出装置,包括挤出机和冷水机,所述螺筒的外筒壁上设置有螺纹孔,且三个螺筒外筒壁上设置的螺纹孔中分别安装有第一温度传感器、第二温度传感器和第三温度传感器,所述冷水机的排水口连接有排水管,所述排水管远离冷水机的一端封口设置,所述排水管的管壁与三个螺筒的进水接头之间各连接有一个螺筒进水管,三个螺筒进水管上分别设置有第一电磁阀、第二电磁阀和第三电磁阀,所述冷水机的回水口连接有回水管,所述回水管远离冷水机的一端封口设置,所述回水管的管壁与三个螺筒的出水接头之间各连接有一个螺筒出水管；本发明具有自动调节螺筒温度的优点。(The invention discloses an extrusion device for producing PET polyester particles, which comprises an extruder and a water cooler, wherein the outer cylinder wall of each screw cylinder is provided with a threaded hole, the threaded holes arranged on the outer cylinder walls of the three screw cylinders are respectively provided with a first temperature sensor, a second temperature sensor and a third temperature sensor, a water outlet of the water cooler is connected with a water outlet pipe, one end of the water outlet pipe, which is far away from the water cooler, is sealed, a screw cylinder water inlet pipe is respectively connected between the pipe wall of the water outlet pipe and water inlet joints of the three screw cylinders, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve are respectively arranged on the three screw cylinder water inlet pipes, a water return port of the water cooler is connected with a water return pipe, one end of the water return pipe, which is far away from the water cooler, is sealed, and a screw cylinder water outlet pipe is respectively connected between the pipe wall; the invention has the advantage of automatically adjusting the temperature of the screw cylinder.)

1. The extrusion device for producing the PET polyester particles is characterized by comprising an extruder (1) and a water cooler (2), wherein the extruder (1) comprises three screw barrels (3), a hollow interlayer is arranged on the barrel wall of each screw barrel (3), a water inlet connector and a water outlet connector are arranged on the barrel wall of the outer wall of each screw barrel (3), the water inlet connector and the water outlet connector are communicated with the hollow interlayer of each screw barrel (3), the extrusion device is characterized in that a threaded hole is formed in the outer barrel wall of each screw barrel (3), a first temperature sensor (11), a second temperature sensor (12) and a third temperature sensor (13) are respectively arranged in the threaded hole formed in the outer barrel wall of each screw barrel (3), a water outlet of the water cooler (2) is connected with a water outlet pipe (4), and one end of each water outlet pipe (4) far away from the water cooler (2) is sealed, a barrel water inlet pipe (5) is connected between the pipe wall of the water outlet pipe (4) and water inlet connectors of the three barrels (3), a first electromagnetic valve (8), a second electromagnetic valve (9) and a third electromagnetic valve (10) are arranged on the three barrel water inlet pipes (5) respectively, a water return port of the water cooling machine (2) is connected with a water return pipe (6), one end, far away from the water cooling machine (2), of the water return pipe (6) is sealed, and a barrel water outlet pipe (7) is connected between the pipe wall of the water return pipe (6) and the water outlet connectors of the three barrels (3); still include control box (25), be provided with first intelligent temperature controller, second intelligence temperature controller and third intelligence temperature controller in control box (25), first temperature sensor (11), second temperature sensor (12) and third temperature sensor (13) link to each other with the input electrical property of first intelligent temperature controller, second intelligence temperature controller and third intelligence temperature controller respectively, first solenoid valve (8), second solenoid valve (9) and third solenoid valve (10) link to each other with the output electrical property of first intelligent temperature controller, second intelligence temperature controller and third intelligence temperature controller respectively.

2. The extrusion device for producing the PET polyester granules as claimed in claim 1, wherein the extruder (1) is provided with a speed reducer (14), the speed reducer (14) is provided with a cooling pipe (15), the cooling pipe (15) is positioned below each gear in the speed reducer (14), the side wall of the lower end of the speed reducer (14) is provided with two cylindrical through holes, and two ends of the cooling pipe (15) respectively penetrate through the two cylindrical through holes arranged on the side wall of the speed reducer (14) and are positioned outside the speed reducer (14); a gear box water inlet pipe (16) is connected between the pipe wall of the water outlet pipe (4) and one end of the cooling pipe (15), a fourth electromagnetic valve (17) is arranged on the gear box water inlet pipe (16), and a gear box water outlet pipe (18) is connected between the pipe wall of the water return pipe (6) and the other end of the cooling pipe (15); be provided with fourth temperature sensor (19) on speed reducer (14), fourth temperature sensor (19) are arranged in detecting the temperature of gear oil in speed reducer (14), still be provided with fourth intelligent temperature controller in control box (25), fourth temperature sensor (19) and the input electrical property of fourth intelligent temperature controller link to each other, fourth solenoid valve (17) and the output electrical property of fourth intelligent temperature controller link to each other.

3. The extrusion apparatus for producing PET polyester pellets as claimed in claim 2, wherein the cooling pipe (15) has a U-shaped, S-shaped or multi-S-shaped structure, and the cooling pipe (15) is made of a stainless steel pipe.

4. The extrusion device for producing the PET polyester granules as claimed in claim 2, wherein a circular groove is arranged on the wall of the cylindrical through hole arranged on the side wall of the lower end of the speed reducer (14), a sealing ring is arranged in the circular groove, and the sealing ring forms a seal between the wall of the cylindrical through hole and the outer wall of the cooling pipe (15).

5. The extrusion device for producing the PET polyester granules as claimed in claim 2, wherein a threaded through hole is formed in the upper end wall of the speed reducer (14), an impurity removing rod (20) is installed on the threaded through hole in a threaded manner, the lower end of the impurity removing rod (20) extends into the speed reducer (14) and is arranged to avoid gears in the speed reducer (14), and a magnet ball (21) is arranged at the lower end of the impurity removing rod (20).

6. The extrusion device for producing the PET polyester granules as claimed in claim 5, wherein the impurity removing rod (20) is provided with a hand-screwing part (2001), the transverse section of the hand-screwing part (2001) is a regular hexagon, and the hand-screwing part (2001) is positioned on the upper side of the threaded part of the impurity removing rod (20).

7. The extrusion device for producing the PET polyester granules as claimed in any one of claims 1 to 6, further comprising a support element for supporting one end of the screw cylinder (3) far away from the speed reducer (14), wherein the support element comprises two support blocks (22) and a screw rod (23), the longitudinal section of each support block (22) is in a right-angled triangle shape, the inclined plane of each support block is in an arc-shaped surface structure, the inclined sides of the two support blocks (22) are oppositely arranged, the support blocks (22) are provided with threaded through holes, the screw rod (23) passes through the threaded through holes of the two support blocks (22), and the screw rod (23) on the rod body outside the two support blocks (22) is provided with a nut (24).

8. The extrusion device as claimed in any one of claims 1 to 6, wherein the intelligent temperature controller is a digital display type intelligent temperature controller, and the model of the digital display type intelligent temperature controller is CH 102.

9. The extrusion device for producing the PET polyester granules as claimed in any one of claims 2 to 6, wherein each temperature sensor uses a pressure spring pair, and each electromagnetic valve uses a normally closed type electromagnetic valve.

Technical Field

The invention relates to the technical field of production of PET polyester particles, in particular to an extrusion device for producing PET polyester particles.

Background

The production of PET polyester particles requires the procedures of banburying, extruding, granulating, cooling, collecting and the like. Wherein the extrusion process is one of the important processes, and the quality of the PET polyester granules is determined to a large extent by the extrusion process. The extrusion process for the production of PET polyester pellets uses equipment which is a screw extruder. The screw extruder comprises a motor, a speed reducer, a screw cylinder, a heating ring and other equipment and components. After raw materials for producing PET polyester particles enter the screw barrel, under the action of the screw, the raw materials are in friction extrusion with the outer wall of the screw and the screw barrel, a large amount of heat is generated, the heat is remained except for the melting requirement of the raw materials, the remained heat is dissipated in time, otherwise, the problem of coke materials caused by overheating of the raw materials in the screw barrel is caused, and the quality of products is seriously influenced. For this purpose, a cooling device is required to dissipate the excess heat in the screw barrel. The amount of cooling water conveyed into the screw cylinder by the cooling device needs to be adjusted according to the temperature of the screw cylinder, so that the temperature of the screw cylinder is kept within the temperature range required by the process, but the prior cooling device needs to be manually adjusted when adjusting the water supply amount into the screw cylinder, and is very inconvenient to use.

Disclosure of Invention

The invention aims to provide an extrusion device for producing PET polyester granules, which aims to solve the problems that the existing cooling device of an extruder needs manual adjustment when adjusting the water feeding amount into a screw cylinder, and the use is very inconvenient.

The invention is realized by the following steps: an extrusion device for producing PET polyester particles comprises an extruder and a water cooler, wherein the extruder comprises three screw barrels, a hollow interlayer is arranged on the barrel wall of each screw barrel, a water inlet connector and a water outlet connector are arranged on the barrel wall of the outer wall of each screw barrel, the water inlet connector and the water outlet connector are both communicated with the hollow interlayer of each screw barrel, a threaded hole is formed in the barrel wall of each screw barrel, a first temperature sensor, a second temperature sensor and a third temperature sensor are respectively arranged in the threaded holes formed in the barrel walls of the three screw barrels, a water outlet of the water cooler is connected with a water discharge pipe, one end, far away from the water cooler, of the water discharge pipe is sealed, a screw barrel water inlet pipe is respectively connected between the pipe wall of the water discharge pipe and the water inlet connectors of the three screw barrels, and a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve are respectively arranged on the water inlet pipes, a water return port of the water cooling machine is connected with a water return pipe, one end of the water return pipe, which is far away from the water cooling machine, is sealed, and a screw barrel water outlet pipe is connected between the pipe wall of the water return pipe and the water outlet connectors of the three screw barrels respectively; the intelligent temperature controller is characterized by further comprising a control box, wherein a first intelligent temperature controller, a second intelligent temperature controller and a third intelligent temperature controller are arranged in the control box, the first temperature sensor, the second temperature sensor and the third temperature sensor are respectively electrically connected with the input ends of the first intelligent temperature controller, the second intelligent temperature controller and the third intelligent temperature controller, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are respectively electrically connected with the output ends of the first intelligent temperature controller, the second intelligent temperature controller and the third intelligent temperature controller.

Furthermore, a speed reducer is arranged on the extruder, a cooling pipe is arranged in the speed reducer, the cooling pipe is positioned below each gear in the speed reducer, two cylindrical through holes are formed in the side wall of the lower end of the speed reducer, and two ends of the cooling pipe respectively penetrate through the two cylindrical through holes formed in the side wall of the speed reducer and are positioned on the outer side of the speed reducer; a gear box water inlet pipe is connected between the pipe wall of the water outlet pipe and one end of the cooling pipe, a fourth electromagnetic valve is arranged on the gear box water inlet pipe, and a gear box water outlet pipe is connected between the pipe wall of the water return pipe and the other end of the cooling pipe; the speed reducer is provided with a fourth temperature sensor, the fourth temperature sensor is used for detecting the temperature of gear oil in the speed reducer, a fourth intelligent temperature controller is further arranged in the control box, the fourth temperature sensor is electrically connected with the input end of the fourth intelligent temperature controller, and the fourth electromagnetic valve is electrically connected with the output end of the fourth intelligent temperature controller.

Further, the cooling pipe is in a U-shaped, S-shaped or multiple S-shaped structure, and is made of stainless steel pipes.

Furthermore, a circular groove is formed in the hole wall of the cylindrical through hole formed in the side wall of the lower end of the speed reducer, a sealing ring is arranged in the circular groove, and the sealing ring forms sealing between the hole wall of the cylindrical through hole and the outer wall of the cooling pipe.

Furthermore, be provided with the screw thread through-hole on the upper end wall of speed reducer, and this screw thread through-hole screw thread installs the edulcoration pole, the lower extreme of edulcoration pole stretches into to the speed reducer to avoid each gear setting in the speed reducer, the lower extreme of edulcoration pole is provided with the magnet ball.

Furthermore, be provided with hand portion of twisting on the edulcoration pole, the horizontal cross-section of hand portion of twisting is regular hexagon, hand portion of twisting is located the upside of the screw thread portion of edulcoration pole.

The supporting element is used for supporting one end, far away from the speed reducer, of the screw cylinder, the supporting element comprises two supporting blocks and a screw rod, the longitudinal section of each supporting block is in a right-angle triangular shape, the inclined plane of each supporting block is of an arc-shaped surface structure, the inclined sides of the two supporting blocks are arranged oppositely, threaded through holes are formed in the supporting blocks, the screw rod penetrates through the threaded through holes of the two supporting blocks, and a nut is arranged on each rod body, located on the outer sides of the two supporting blocks, of the screw rod.

Furthermore, the intelligent temperature controller is a digital display type intelligent temperature controller, and the model of the digital display type intelligent temperature controller is CH 102.

Furthermore, each temperature sensor uses a pressure spring couple, and each electromagnetic valve uses a normally closed electromagnetic valve.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can automatically detect the temperature of each screw cylinder of the extruder, compares the detected temperature with the temperature set on the intelligent temperature controller, and automatically controls whether cooling water is introduced into each screw cylinder according to the comparison result, thereby having the advantage of automatically adjusting the temperature of the screw cylinder.

2. The cooling device is provided with a structure for cooling the gear oil in the speed reducer of the extruder, and can also realize automatic cooling of the gear oil, thereby effectively prolonging the service life of the speed reducer.

3. The supporting element is used for supporting one end, far away from the speed reducer, of the screw barrel and comprises two supporting blocks and a screw rod, the longitudinal section of each supporting block is in a right-angle triangular shape, the inclined plane of each supporting block is in an arc-shaped surface structure, the inclined sides of the two supporting blocks are arranged oppositely, threaded through holes are formed in the supporting blocks, the screw rod penetrates through the threaded through holes of the two supporting blocks, and nuts are arranged on rod bodies of the screw rod, located on the outer sides of the two supporting blocks. Through the technical scheme, the distance between the arc surfaces of the two supporting blocks can be adjusted according to the outer diameter of the screw cylinder, so that the arc surfaces of the two supporting blocks are supported on the outer wall of the lower end of the screw cylinder, the screw cylinder is more stable, the stress of a bolt for mounting the screw cylinder on the speed reducer can be reduced, and the service life of the speed reducer is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a block diagram of an electrical control system according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;

fig. 4 is a block diagram of an electric control system according to a second embodiment of the present invention;

FIG. 5 is a schematic structural view of a cooling pipe according to a second embodiment of the present invention;

FIG. 6 is a schematic structural view of a trash bar according to a second embodiment of the present invention;

fig. 7 is a schematic perspective view of a supporting element according to a second embodiment of the present invention.

In the figure: 1. an extruder; 2. a water chiller; 3. a screw cylinder; 4. a drain pipe; 5. a screw barrel water inlet pipe; 6. a water return pipe; 7. a water outlet pipe of the screw cylinder; 8. a first solenoid valve; 9. a second solenoid valve; 10. a third electromagnetic valve; 11. a first temperature sensor; 12. a second temperature sensor; 13. a third temperature sensor; 14. a speed reducer; 15. a cooling tube; 16. a water inlet pipe of the gear box; 17. a fourth solenoid valve; 18. a water outlet pipe of the gear box; 19. a fourth temperature sensor; 20. an impurity removal rod; 2001. a hand-wringing portion; 21. a magnet ball; 22. a support block; 23. a screw rod; 24. a nut; 25. and a control box.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows:

referring to fig. 1 and 2, an extrusion device for producing PET polyester particles comprises an extruder 1 and a water cooler 2, wherein the extruder 1 comprises three screw barrels 3, a hollow interlayer is arranged on the barrel wall of each screw barrel 3, a water inlet connector and a water outlet connector are arranged on the barrel wall of the outer wall of each screw barrel 3, the water inlet connector and the water outlet connector are both communicated with the hollow interlayer of each screw barrel 3, a threaded hole is arranged on the barrel wall of each screw barrel 3, a first temperature sensor 11, a second temperature sensor 12 and a third temperature sensor 13 are respectively arranged in the threaded holes arranged on the barrel walls of the three screw barrels 3, a water outlet of the water cooler 2 is connected with a water discharge pipe 4, one end of the water discharge pipe 4, which is far away from the water cooler 2, is sealed, a screw barrel water inlet pipe 5 is respectively connected between the pipe wall of the water discharge pipe 4 and the water inlet connectors of the three screw barrels 3, and a first electromagnetic valve 8 is respectively arranged, A second electromagnetic valve 9 and a third electromagnetic valve 10, a water return port of the water cooling machine 2 is connected with a water return pipe 6, one end of the water return pipe 6 far away from the water cooling machine 2 is sealed and arranged, and a screw barrel water outlet pipe 7 is respectively connected between the pipe wall of the water return pipe 6 and the water outlet joints of the three screw barrels 3. Still include the control box 25, be provided with first intelligent temperature controller in the control box 25, second intelligent temperature controller and third intelligent temperature controller, first temperature sensor 11, second temperature sensor 12 and third temperature sensor 13 respectively with first intelligent temperature controller, the input electrical property of second intelligent temperature controller and third intelligent temperature controller links to each other, first solenoid valve 8, second solenoid valve 9 and third solenoid valve 10 respectively with first intelligent temperature controller, the output electrical property of second intelligent temperature controller and third intelligent temperature controller links to each other.

In this embodiment, the intelligent temperature controller is a digital display type intelligent temperature controller, and the model of the digital display type intelligent temperature controller is CH 102. Each temperature sensor uses a pressure spring couple, and each electromagnetic valve uses a normally closed electromagnetic valve.

The working principle of the embodiment is as follows: the first temperature sensor 11, the second temperature sensor 12 and the third temperature sensor 13 are respectively used for detecting the temperature of the three screw barrels 3, the process temperatures corresponding to the three screw barrels 3 are arranged on the first intelligent temperature controller, the second intelligent temperature controller and the third intelligent temperature controller, when which temperature sensor detects that the temperature of the corresponding screw barrel 3 is higher than the corresponding process temperature, the intelligent temperature controller corresponding to the temperature sensor controls the corresponding electromagnetic valve to be opened, cold water generated by the water cooler 2 enters the corresponding screw barrel 3 through the corresponding screw barrel water inlet pipe 5 to cool the screw barrel 3, when the temperature of the screw barrel 3 is reduced to be lower than the corresponding process temperature, the corresponding intelligent temperature controller controls the corresponding electromagnetic valve to be closed, and the process is repeated.

Therefore, the temperature of each screw cylinder 3 of the extruder 1 can be automatically detected, the detected temperature is compared with the temperature set on the intelligent temperature controller, whether cooling water is introduced into each screw cylinder 3 or not is automatically controlled according to the comparison result, and the temperature control device has the advantage of automatically adjusting the temperature of the screw cylinders 3.

Example two:

referring to fig. 3, 4 and 5, an extrusion device for producing PET polyester particles comprises an extruder 1 and a water cooler 2, wherein the extruder 1 comprises three screw barrels 3, a hollow interlayer is arranged on the barrel wall of each screw barrel 3, a water inlet connector and a water outlet connector are arranged on the barrel wall of the outer wall of each screw barrel 3, the water inlet connector and the water outlet connector are both communicated with the hollow interlayer of each screw barrel 3, a threaded hole is arranged on the barrel wall of each screw barrel 3, a first temperature sensor 11, a second temperature sensor 12 and a third temperature sensor 13 are respectively arranged in the threaded holes arranged on the barrel wall of each screw barrel 3, a water outlet of the water cooler 2 is connected with a water drain pipe 4, one end of the water drain pipe 4, which is far away from the water cooler 2, is sealed, a screw barrel water inlet pipe 5 is respectively connected between the pipe wall of the water drain pipe 4 and the water inlet connectors of the three screw barrels 3, and a first electromagnetic valve 8 is respectively arranged on each, A second electromagnetic valve 9 and a third electromagnetic valve 10, a water return port of the water cooling machine 2 is connected with a water return pipe 6, one end of the water return pipe 6 far away from the water cooling machine 2 is sealed and arranged, and a screw barrel water outlet pipe 7 is respectively connected between the pipe wall of the water return pipe 6 and the water outlet joints of the three screw barrels 3. Still include the control box 25, be provided with first intelligent temperature controller in the control box 25, second intelligent temperature controller and third intelligent temperature controller, first temperature sensor 11, second temperature sensor 12 and third temperature sensor 13 respectively with first intelligent temperature controller, the input electrical property of second intelligent temperature controller and third intelligent temperature controller links to each other, first solenoid valve 8, second solenoid valve 9 and third solenoid valve 10 respectively with first intelligent temperature controller, the output electrical property of second intelligent temperature controller and third intelligent temperature controller links to each other.

Furthermore, the extruder 1 is provided with a speed reducer 14, the speed reducer 14 is provided with a cooling pipe 15, the cooling pipe 15 is in a U-shaped, S-shaped or multiple S-shaped structure, and the cooling pipe 15 is made of a stainless steel pipe. The cooling pipe 15 is located below each gear in the speed reducer 14, two cylindrical through holes are arranged on the side wall of the lower end of the speed reducer 14, and two ends of the cooling pipe 15 respectively penetrate through the two cylindrical through holes arranged on the side wall of the speed reducer 14 and are located on the outer side of the speed reducer 14. A gear box water inlet pipe 16 is connected between the pipe wall of the water outlet pipe 4 and one end of the cooling pipe 15, a fourth electromagnetic valve 17 is arranged on the gear box water inlet pipe 16, and a gear box water outlet pipe 18 is connected between the pipe wall of the water return pipe 6 and the other end of the cooling pipe 15. The speed reducer 14 is provided with a fourth temperature sensor 19, the fourth temperature sensor 19 is used for detecting the temperature of gear oil in the speed reducer 14, the control box 25 is further provided with a fourth intelligent temperature controller, the fourth temperature sensor 19 is electrically connected with the input end of the fourth intelligent temperature controller, and the fourth electromagnetic valve 17 is electrically connected with the output end of the fourth intelligent temperature controller.

In this embodiment, the intelligent temperature controller is a digital display type intelligent temperature controller, and the model of the digital display type intelligent temperature controller is CH 102. Each temperature sensor uses a pressure spring couple, and each electromagnetic valve uses a normally closed electromagnetic valve.

Compared with the first embodiment, the first embodiment has the advantages that the structure for cooling the gear oil in the speed reducer 14 of the extruder 1 is added, the automatic cooling of the gear oil can be realized, and the service life of the speed reducer 14 is effectively prolonged.

The hole wall of the cylindrical through hole arranged on the side wall of the lower end of the speed reducer 14 is provided with a circular groove, a sealing ring is arranged in the circular groove, the sealing ring forms sealing between the hole wall of the cylindrical through hole and the outer wall of the cooling pipe 15, and the arrangement can prevent oil leakage at the position of the cylindrical through hole arranged on the side wall of the lower end of the speed reducer 14.

Referring to fig. 3 and 6, a threaded through hole is formed in an upper end wall of the speed reducer 14, an impurity removal rod 20 is installed on the threaded through hole in a threaded manner, a lower end of the impurity removal rod 20 extends into the speed reducer 14 and is arranged to avoid gears in the speed reducer 14, and a magnet ball 21 is arranged at a lower end of the impurity removal rod 20. The magnet ball 21 can absorb iron chips generated during the motion of each gear in the speed reducer 14, and can screw out the impurity removal rod 20 to remove the iron chips, so that impurities in gear oil in the speed reducer 14 are reduced, and the service life of the speed reducer 14 is prolonged. The trash bar 20 is provided with a hand-tightening portion 2001, the cross section of the hand-tightening portion 2001 is a regular hexagon, the hand-tightening portion 2001 is located above the threaded portion of the trash bar 20, and the trash bar 20 can be easily attached and detached by the hand-tightening portion 2001.

Referring to fig. 3 and 7, in the embodiment, a supporting element is further provided, the supporting element is used for supporting one end of the screw cylinder 3 away from the speed reducer 14, the supporting element includes two supporting blocks 22 and a screw rod 23, a longitudinal section of the supporting block 22 is in a right triangle shape, an inclined plane of the supporting block is an arc-shaped surface structure, inclined sides of the two supporting blocks 22 are arranged oppositely, threaded through holes are formed in the supporting blocks 22, the screw rod 23 passes through the threaded through holes of the two supporting blocks 22, and a nut 24 is respectively arranged on a rod body of the screw rod 23 located outside the two supporting blocks 22. Through the technical scheme, the distance between the arc surfaces of the two supporting blocks 22 can be adjusted according to the outer diameter of the screw cylinder 3, so that the arc surfaces of the two supporting blocks 22 are supported on the outer wall of the lower end of the screw cylinder 3, the screw cylinder 3 is more stable, the stress of a bolt for installing the screw cylinder 3 on the speed reducer 14 can be reduced, and the service life of the speed reducer 14 is prolonged.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.