阅读说明：本技术 一种可自动清理的双螺杆挤出机及清理方法 (Double-screw extruder capable of being automatically cleaned and cleaning method ) 是由 高柒龙 纪建 田建修 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种可自动清理的双螺杆挤出机及清理方法,包括与挤出机主体相连的电机,挤出机主体内开设有螺杆腔,螺杆腔内转动设置有第一螺旋杆和第二螺旋杆,第一螺旋杆一端和第二螺旋杆一端穿出挤出机主体且与挤出机主体转动连接；第一螺旋杆穿出挤出机主体部分套设有第一齿轮且与电机相连,第二螺旋杆穿出挤出机主体部分套设有第二齿轮,第一齿轮和第二齿轮啮合连接；第一螺旋杆和第二螺旋杆上还套设有清理环；挤出机主体连接有推动气缸,推动气缸连接有推动杆,推动杆贯穿挤出机主体且与挤出机主体滑动连接,推动杆设置在清理环右侧。本发明利用螺旋杆自身的特性,带动清理环完成挤出机的自动清理工作,操作简单,有效提高了工作效率。(The invention discloses a double-screw extruder capable of automatically cleaning and a cleaning method, wherein the double-screw extruder comprises a motor connected with an extruder main body, a screw cavity is formed in the extruder main body, a first screw rod and a second screw rod are rotatably arranged in the screw cavity, and one end of the first screw rod and one end of the second screw rod penetrate out of the extruder main body and are rotatably connected with the extruder main body; the first screw rod penetrates out of the extruder main body part and is sleeved with a first gear and connected with a motor, the second screw rod penetrates out of the extruder main body part and is sleeved with a second gear, and the first gear is meshed with the second gear; the first screw rod and the second screw rod are also sleeved with cleaning rings; the extruder main part is connected with the promotion cylinder, and the promotion cylinder is connected with the catch bar, and the catch bar runs through the extruder main part and with extruder main part sliding connection, and the catch bar setting is on clearance ring right side. The automatic cleaning device drives the cleaning ring to finish the automatic cleaning work of the extruder by utilizing the characteristics of the screw rod, is simple to operate and effectively improves the working efficiency.)

1. A double-screw extruder capable of being automatically cleaned comprises a motor (7) and an extruder main body (2), wherein a screw cavity (24) is formed in the extruder main body (2), and is characterized in that a first screw rod (3) and a second screw rod (16) are rotationally arranged in the screw cavity (24), and one end of the first screw rod (3) and one end of the second screw rod (16) penetrate through the extruder main body (2) and are rotationally connected with the extruder main body (2); a first gear (22) is sleeved on a part, which penetrates out of the extruder main body (2), of the first screw rod (3) and is connected with the motor (7), a second gear (23) is sleeved on a part, which penetrates out of the extruder main body (2), of the second screw rod (16), and the first gear (22) is meshed with the second gear (23); further comprising:

the cleaning ring (18), a left cleaning felt (17) and a right cleaning felt (21) are arranged on two sides of the cleaning ring (18), the cleaning ring (18) further comprises an inner ring cleaning felt (19) and a screw rod cleaning felt (20), and the cleaning ring (18) is sleeved on the first spiral rod (3) and the second spiral rod (16);

the pushing cylinder (5) is fixedly connected with the extruder body (2), the pushing cylinder (5) is connected with a pushing rod (14), the pushing rod (14) penetrates through the extruder body (2) and is in sliding connection with the extruder body (2), and the pushing rod (14) is arranged on the right side of the cleaning ring (18);

the stirring cylinder (12), the stirring cylinder (12) is hinged to the extruder main body (2), the stirring cylinder (12) is hinged to a shifting fork (11), the extruder main body (2) is provided with a through hole, the shifting fork (11) is arranged in the through hole, the shifting fork (11) is provided with a sliding groove, the extruder main body (2) is connected with a rotating shaft (25), the rotating shaft (25) is arranged in the sliding groove in a sliding mode, the shifting fork (11) is arranged on the left side of the cleaning ring (18), and in an initial state, the shifting fork (11) is in contact with the cleaning ring (18) and used for limiting the horizontal movement of the cleaning ring (18);

the controller is connected with the extruder main body (2), and the motor (7), the poking cylinder (12) and the pushing cylinder (5) are connected with the controller.

2. -twin-screw extruder according to claim 1, characterised in that the screw cleaning felt (20) is arranged between the inner ring cleaning felt (19) and the left side cleaning felt (17), the left side cleaning felt (17) is arranged between the screw cleaning felt (20) and the right side cleaning felt (21), and the screw cleaning felt (20) is further connected with a magnet (15).

3. The double-screw extruder capable of being automatically cleaned according to claim 1, wherein a front Hall switch (1) and a rear Hall switch (9) are further connected to the outer wall of the extruder main body (2), and the front Hall switch (1) and the rear Hall switch (9) are connected with the controller.

4. The twin-screw extruder capable of being automatically cleaned according to claim 1, wherein a hopper (8) is connected to the extruder body (2), the hopper (8) is communicated with the screw cavity (24), a hopper sensor (10) is arranged in the hopper (8), and the hopper sensor (10) is connected with the controller.

5. The double-screw extruder capable of being automatically cleaned according to claim 1, wherein the extruder body (2) is further provided with a discharge port, the discharge port is communicated with the screw cavity (24), and the extruder body (2) is further connected with a heating ring (4).

6. A cleaning method, characterized in that an automatically cleanable twin-screw extruder as claimed in any one of claims 1 to 5 is used, comprising the steps of:

s1, after the extrusion work of the extruder is finished, the motor (7) stops working, the controller controls the shifting cylinder (12) to start, the shifting fork (11) is driven to rotate, the shifting fork (11) moves upwards under the action of the rotating shaft (25), and the shifting fork (11) is separated from the cleaning ring (18);

s2: the controller controls the toggle cylinder (12) to stop working, the push cylinder (5) starts working, the push cylinder (5) pushes the push rod (14) to move leftwards, the push rod (14) pushes the cleaning ring (18) to move leftwards for a specified distance, the controller controls the push cylinder (5) to stop working, and the motor (7) starts working;

s3: the controller controls the motor (7) to rotate for a specified time, the cleaning ring (18) moves to the left ends of the first screw rod (3) and the second screw rod (16) under the action of the first screw rod (3) and the second screw rod (16), then the controller controls the motor (7) to rotate reversely for a specified time, the cleaning ring (18) moves to an initial position, and in the process, the cleaning ring (18) finishes the cleaning work of residual materials on the first screw rod (3) and the second screw rod (16);

s4: the controller controls the motor (7) to stop working, the poking cylinder (12) starts working, the shifting fork (11) is driven to rotate, the shifting fork (11) is driven to move downwards to the initial position under the action of the rotating shaft (25), and the shifting fork (11) is contacted with the cleaning ring (18), so that the cleaning work of the extruder is completed.

7. A method as claimed in claim 6, wherein in step S1, when the hopper sensor (10) detects that there is no material in the hopper (8), the hopper sensor (10) sends a corresponding signal to the controller, and the controller delays T₁And then, the controller controls the toggle cylinder (12) to start.

8. A cleaning method according to claim 6, characterized in that in step S3, the controller controls the motor (7) to rotate, so that the cleaning ring (18) moves to the left, when the cleaning ring (18) moves to the position of the front Hall switch (1), under the action of the magnet (15), the front Hall switch (1) detects the position of the cleaning ring (18) and transmits a corresponding signal to the controller, and the controller controls the motor (7) to rotate reversely.

9. A cleaning method according to claim 8, characterized in that the motor (7) rotates reversely to drive the cleaning ring (18) to move rightwards, when the cleaning ring (18) moves to the position of the rear Hall switch (9), under the action of the magnet (15), the rear Hall switch (9) detects the position of the cleaning ring (18) and transmits a corresponding signal to the controller, the controller controls the motor (7) to stop working, and the toggle cylinder (12) starts working.

10. A cleaning method according to claim 8, characterized in that when the cleaning ring (18) needs to be replaced, the controller controls the toggle cylinder (12) and the push cylinder (5) to be started, the toggle cylinder (12) drives the shift fork (11) to rotate, so that the shift fork (11) moves upwards, the shift fork (11) is separated from the cleaning ring (18), then the push cylinder (5) pushes the push rod (14) to move leftwards for a specified distance, then the push cylinder (5) drives the shift fork (11) to move downwards, and the shift fork (11) shifts the cleaning ring (18) downwards, so that the cleaning ring (18) falls into the screw rod cavity (24).

Technical Field

The invention relates to the technical field of extruders, in particular to a double-screw extruder capable of being automatically cleaned and a cleaning method.

Background

In the conventional twin-screw extruder, in order to increase the material throughput per unit time, the following improvements are being made: a double-threaded deep-groove screw is used which increases the stirring capacity of the screw by reducing the thread inner diameter of the screw relative to the outer diameter of the screw, and the rotational driving force of the screw is increased. If the inside diameter of the screw flight is to be reduced, the outside diameter of the screw shaft must be reduced. On the other hand, if the rotational driving force of the screw is increased, the strength of the screw shaft must be increased. In the process, the melted raw materials are finally adhered to the screw shaft or the screw cavity along with the increase of the pressure, so that the material treatment capacity in unit time is seriously influenced, and the conventional cleaning methods comprise the following methods;

firstly, heating a machine barrel to the forming temperature of residual materials in the machine barrel; after the temperature is raised to the molding temperature, the machine head is detached while the machine head is hot, and materials at the hole end of the machine barrel and the end part of the screw rod are arranged; and if the material permeates into the screw mandrel, the screw element is difficult to disassemble, the screw element can be gently knocked by a wooden hammer or a copper bar along the periphery of the screw element, and the element is taken out after loosening. If the material is still difficult to take out, the material needs to be placed into the machine barrel again for heating, and the material can be discharged when the material is molten.

And secondly, manually adding the machine washing material from the feed opening until the color of the extruded material strips is pure (the color is the same as that of the machine washing material granules), stopping feeding, emptying the material and stopping the rotation of the screw. The die was opened and cleaned. However, the cleaning temperature cannot be lower than 180 ℃, otherwise the material may not be extruded, or the screw may be jammed or the equipment may be damaged. Furthermore, it should be noted that the feeding speed and current should be controlled within 60% of the full load, and the material should not be filled at one time, otherwise the high hardness will cause the screw to be blocked by a large friction force.

Either method is a very complicated operation method, which seriously restricts the improvement of production efficiency and reduces the material processing amount in unit time.

Disclosure of Invention

In order to solve the problems in the prior art, the double-screw extruder capable of being automatically cleaned and the cleaning method are provided.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the invention provides a double-screw extruder capable of being automatically cleaned, which comprises a motor and an extruder main body, wherein a screw cavity is formed in the extruder main body, a first screw rod and a second screw rod are rotatably arranged in the screw cavity, and one end of the first screw rod and one end of the second screw rod penetrate out of the extruder main body and are rotatably connected with the extruder main body; the first screw rod penetrates out of the extruder main body part and is sleeved with a first gear and connected with the motor, the second screw rod penetrates out of the extruder main body part and is sleeved with a second gear, and the first gear is meshed with the second gear; further comprising:

the cleaning ring is provided with a left cleaning felt and a right cleaning felt at two sides, the cleaning ring further comprises an inner ring cleaning felt and a screw rod cleaning felt, and the cleaning ring is sleeved on the first screw rod and the second screw rod;

the pushing cylinder is fixedly connected with the extruder body, the pushing cylinder is connected with a pushing rod, the pushing rod penetrates through the extruder body and is in sliding connection with the extruder body, and the pushing rod is arranged on the right side of the cleaning ring;

stir the cylinder, stir the cylinder with the extruder body is articulated, it has the shift fork to stir the cylinder articulated, the extruder body has been seted up the through-hole, the shift fork sets up in this through-hole, the spout has been seted up to the shift fork, the extruder body is connected with the pivot, the pivot slides and sets up in this spout, the shift fork sets up clearance ring left side, under initial state, the shift fork with the clearance ring contacts for the restriction clearance ring horizontal direction removes.

And the controller is used for controlling the integral operation of the device, and the motor, the poking cylinder and the pushing cylinder are connected with the controller.

Preferably, the screw rod cleaning felt is arranged between the inner ring cleaning felt and the left side cleaning felt, the left side cleaning felt is arranged between the screw rod cleaning felt and the right side cleaning felt, and the screw rod cleaning felt is further connected with a magnet.

Preferably, the outer wall of the extruder main body is further connected with a front Hall switch and a rear Hall switch, and the front Hall switch and the rear Hall switch are connected with the controller.

Preferably, the extruder main body is connected with a hopper, the hopper is communicated with the screw cavity, a hopper sensor is arranged in the hopper, and the hopper sensor is connected with the controller.

Preferably, the extruder main body is further provided with a discharge port, the discharge port is communicated with the screw cavity, and the extruder main body is further connected with a heating ring.

The invention also provides a cleaning method, and the double-screw extruder capable of automatically cleaning comprises the following steps:

s1, after the extruder finishes extrusion work, the motor stops working, the controller controls the shifting cylinder to start to drive the shifting fork to rotate, and under the action of the rotating shaft, the shifting fork moves upwards and is separated from the cleaning ring;

s2: the controller controls the shifting cylinder to stop working, the pushing cylinder starts working, the pushing cylinder pushes the pushing rod to move leftwards, the pushing rod pushes the cleaning ring to move leftwards for a specified distance, the controller controls the pushing cylinder to stop working, and the motor starts working;

s3: the controller controls the motor to rotate for a specified time, the cleaning ring moves to the left ends of the first screw rod and the second screw rod under the action of the first screw rod and the second screw rod, then the controller controls the motor to rotate reversely for the specified time, the cleaning ring moves to an initial position, and in the process, the cleaning ring finishes the cleaning work of residual materials on the first screw rod and the second screw rod;

s4: the controller controls the motor to stop working, the shifting cylinder starts working, the shifting fork is driven to rotate, the shifting fork is driven to move downwards to an initial position under the action of the rotating shaft, and the shifting fork is in contact with the cleaning ring, so that the cleaning work of the extruder is completed.

Preferably, in step S1, when the hopper sensor detects that there is no material in the hopper, the hopper sensor transmits a corresponding signal to the controller, and the controller delays T₁And then, the controller controls the toggle cylinder to start.

Preferably, in step S3, the controller controls the motor to rotate, so that the cleaning ring moves to the left, when the cleaning ring moves to the front hall switch, the front hall switch detects the position of the cleaning ring and transmits a corresponding signal to the controller under the action of the magnet, and the controller controls the motor to rotate reversely.

Preferably, the motor reversal drives clearance ring to move to the right, and when the clearance ring moved back hall switch position, under the effect of magnet, back hall switch detected the position of clearance ring and transmitted corresponding signal for the controller, and the controller control motor stop work stirs the cylinder and begins work.

Preferably, when the clearance ring needs to be changed, the controller control is stirred the cylinder and is promoted the cylinder start, stirs the cylinder and drives the shift fork rotation, makes the shift fork rebound, shift fork and clearance ring separation, then promotes the cylinder and promotes the catch bar and remove appointed distance left, later promotes cylinder drive shift fork rebound, and the shift fork is stirred the clearance ring downwards, makes the clearance ring fall into the screw rod intracavity.

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

1. according to the cleaning ring, the left cleaning felt is attached to the back of the spiral, the right cleaning felt is attached to the front of the spiral, the inner ring is used for cleaning the cavity surface of the screw rod, and the screw rod is used for cleaning the main body of the screw rod.

2. According to the invention, the material in the hopper is detected by the hopper sensor, and after the material is processed, the hopper sensor transmits a corresponding signal to the controller, so that the controller can control the cleaning ring to perform cleaning work in time.

3. According to the invention, the shifting fork driven by the shifting cylinder is used for realizing the relative fixation of the position of the cleaning ring, and the pushing cylinder pushes the cleaning ring to move leftwards, so that the screw rod can conveniently drive the cleaning ring to move.

4. According to the invention, the Hall switch is arranged, wherein the Hall switch is matched with the magnet and is used for detecting the position of the cleaning ring, so that the controller can conveniently control the moving direction of the cleaning ring, and after the cleaning ring finishes the cleaning work, the controller can conveniently control the toggle cylinder, so that the relative fixation of the position of the cleaning ring is realized.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is an overall front view of the present invention;

FIG. 2 is an overall top view of the present invention;

FIG. 3 is a schematic view of the structure of part A of FIG. 1;

FIG. 4 is a schematic structural view of part B of FIG. 2;

FIG. 5 is a schematic view of a cleaning ring configuration of the present invention;

figure 6 is a side view of the cleaning ring structure of the present invention.

Description of reference numerals:

1, a front Hall switch; 2 an extruder body; 3 a first screw rod; 4, heating a ring; 5, pushing the air cylinder; 6, a speed reducer; 7, a motor; 8, a hopper; 9 rear Hall switch; 10 hopper sensors; 11, a shifting fork; 12, toggling a cylinder; 13 pushing the pad; 14 pushing the rod; 15 a magnet; 16 a second screw rod; 17 cleaning the felt on the left side; 18 cleaning the ring; 19 cleaning felt for the inner ring; cleaning felt by a screw rod 20; 21 cleaning felt on the right side; 22 a first gear; 23 a second gear; 24 a screw cavity; 25 rotating the shaft.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1-6, the present embodiment provides an automatic cleaning twin-screw extruder, which includes an extruder body 2, the extruder body 2 is fixedly connected with a motor 7, and a screw cavity 24 is formed in the extruder body 2. The extruder body 2 is also connected with a controller for controlling the overall operation of the apparatus.

The first screw rod 3 and the second screw rod 16 are rotatably arranged in the screw cavity 24, and one end of the first screw rod 3 and one end of the second screw rod 16 penetrate out of the extruder main body 2 and are rotatably connected with the extruder main body 2. The part of the first screw rod 3 penetrating out of the extruder main body 2 is sleeved with a first gear 22, the first gear 22 is fixedly connected with the first screw rod 3, the part of the second screw rod 16 penetrating out of the extruder main body 2 is sleeved with a second gear 23, the second gear 23 is fixedly connected with the second screw rod 16, and the first gear 22 is meshed with the second gear 23.

The motor 7 is connected with the first screw rod 3 through the speed reducer 6 and penetrates out of the extruder main body 2, the motor 7 drives the first screw rod 3 to rotate, the second gear 23 meshed with the first gear 22 drives the second screw rod 16 to rotate, and the first screw rod 3 and the second screw rod 16 are arranged on the same horizontal plane to facilitate the operation of the extruder. The extruder main body 2 is further connected with a heating ring 4, the heating ring 4 and a motor 7 are connected with a controller, and the heating ring 4 is used for heating to facilitate processing of materials.

The extruder main body 2 is connected with a hopper 8, the hopper 8 is communicated with a screw cavity 24, a hopper sensor 10 is arranged in the hopper 8, the hopper sensor 10 is connected with a controller, and the hopper sensor 10 is used for detecting the material condition in the hopper 8 and transmitting corresponding signals to the controller. The extruder main body 2 is also provided with a discharge port which is communicated with the screw cavity 24 and used for discharging materials after extrusion is finished.

Further comprising: the left side of the cleaning ring 18 is provided with a left cleaning felt 17, the right side of the cleaning ring 18 is provided with a right cleaning felt 21, the cleaning ring 18 further comprises an inner ring cleaning felt 19 and a screw rod cleaning felt 20, and the cleaning ring 18 is sleeved on the first screw rod 3 and the second screw rod 16.

The screw rod cleaning felt 20 is arranged between the inner ring cleaning felt 19 and the left cleaning felt 17, the left cleaning felt 17 is arranged between the screw rod cleaning felt 20 and the right cleaning felt 21, and the screw rod cleaning felt 20 is further connected with the magnet 15. Wherein the left cleaning felt 17, the right cleaning felt 21, the inner ring cleaning felt 19 and the screw rod cleaning felt 20 are arranged in two and are centrosymmetric.

Wherein the spiral of two hob screws of left side clearance felt 17 laminating is at the back, and the spiral of two hob screws of right side clearance felt 21 laminating is in front, and the screw cavity face of two hob screws is cleared up to inner ring clearance felt 19, and screw rod main part of two hob screws is cleared up to screw rod clearance felt 20, and is rational in infrastructure, does benefit to the efficiency and the quality that improve the hob screw clearance.

Promote cylinder 5, promote cylinder 5 and extruder main part 2 fixed connection, promote cylinder 5 and be connected with catch bar 14, catch bar 14 run through extruder main part 2 and with extruder main part 2 sliding connection, the one end that catch bar 14 is located screw cavity 24 is connected with the promotion and fills up 13, catch bar 14 sets up on clearance ring 18 right side.

Promote cylinder 5 and link to each other with the controller, promote cylinder 5 drive catch bar 14 and remove, and then drive the 18 horizontal directions of clearance ring and remove, promote cylinder 5 and be used for giving clearance ring 18 initial acting force, make the spiral part of the first hob 3 of clearance ring 18 laminating and second hob 16, make things convenient for follow-up first hob 3 and second hob 16 to drive clearance ring 18 and remove.

Stir cylinder 12, stir cylinder 12 and extruder main part 2 and articulate, stir cylinder 12 and articulate and have shift fork 11, and extruder main part 2 has seted up the through-hole, and shift fork 11 sets up in this through-hole, and shift fork 11 has seted up the spout, and extruder main part 2 is connected with pivot 25, and pivot 25 slides and sets up in this spout, and shift fork 11 sets up on clearance ring 18 left side.

The electric toggle cylinder 12 and the pushing cylinder 5 are connected with a controller, and the rotating shaft 25 is used for limiting the movement direction of the shifting fork 11, so that the shifting fork 11 can move up and down through a through hole of the extruder body 2; under initial condition, shift fork 11 contacts with clearance ring 18 for restriction clearance ring 18 horizontal direction removes, when the extruder operation, because shift fork 11's restriction, clearance ring 18 can't carry out horizontal direction's removal, prevents that clearance ring 18 from influencing the normal operating of device.

The outer wall of the extruder main body 2 is also connected with a front Hall switch 1 and a rear Hall switch 9, and the front Hall switch 1 and the rear Hall switch 9 are connected with a controller; the front Hall switch 1 is arranged on the left side of the extruder main body 2, and the rear Hall switch 9 is arranged on the right side of the extruder main body 2; the front Hall switch 1 and the rear Hall switch 9 are matched with the magnet 15 on the cleaning ring 18 and used for detecting the position of the cleaning ring 18 in the screw cavity 24.

The invention also provides a cleaning method, and the double-screw extruder capable of automatically cleaning comprises the following steps:

s1, after the extruder finishes extrusion work, the motor 7 stops working, the controller controls the shifting cylinder 12 to start to drive the shifting fork 11 to rotate, under the action of the rotating shaft 25, the shifting fork 11 moves upwards, the shifting fork 11 is separated from the cleaning ring 18, and the shifting fork 11 does not limit the movement of the cleaning ring 18 any more;

s2: the controller controls the toggle cylinder 12 to stop working, the push cylinder 5 to start working, the push cylinder 5 pushes the push rod 14 to move leftwards, the push rod 14 pushes the cleaning ring 18 to move leftwards for a specified distance, the controller controls the push cylinder 5 to stop working, and the motor 7 starts working;

s3: the controller controls the motor 7 to rotate for a designated time, under the action of the first screw rod 3 and the second screw rod 16, the cleaning ring 18 moves to the left ends of the first screw rod 3 and the second screw rod 16, then the controller controls the motor 7 to rotate reversely for the designated time, the cleaning ring 18 moves to an initial position, and in the process, the cleaning ring 18 finishes the cleaning work of residual materials on the first screw rod 3 and the second screw rod 16;

s4: the controller controls the motor 7 to stop working, the poking cylinder 12 starts working, the shifting fork 11 is driven to rotate, the shifting fork 11 is driven to move downwards to the initial position under the action of the rotating shaft 25, and the shifting fork 11 is in contact with the cleaning ring 18, so that the cleaning work of the extruder is completed.

In step S1, when the hopper sensor 10 detects that there is no material in the hopper 8, the hopper sensor 10 transmits a corresponding signal to the controller, and the controller delays T₁And then, the controller controls the toggle cylinder 12 to start, so that the automatic cleaning work is realized.

In step S3, the controller controls the motor 7 to rotate, so that the cleaning ring 18 moves leftwards, when the cleaning ring 18 moves to the position of the front hall switch 1, under the action of the magnet 15, the front hall switch 1 detects the position of the cleaning ring 18 and transmits a corresponding signal to the controller, and the controller controls the motor 7 to rotate reversely.

Under the action of the first screw rod 3 and the second screw rod 16, the motor 7 rotates reversely to drive the cleaning ring 18 to move rightwards, when the cleaning ring 18 moves to the position of the rear Hall switch 9, under the action of the magnet 15, the rear Hall switch 9 detects the position of the cleaning ring 18 and transmits a corresponding signal to the controller, and the controller controls the motor 7 to stop working and stirs the air cylinder 12 to start working.

When the cleaning ring 18 needs to be replaced, the controller controls the shifting cylinder 12 and the pushing cylinder 5 to be started, the shifting cylinder 12 drives the shifting fork 11 to rotate, the shifting fork 11 is enabled to move upwards, the shifting fork 11 is separated from the cleaning ring 18, the shifting fork 11 does not limit the movement of the cleaning ring 18 any more, then the pushing cylinder 5 pushes the pushing rod 14 to move leftwards for a specified distance, the cleaning ring 18 is enabled to move below the shifting fork 11, then the pushing cylinder 5 drives the shifting fork 11 to move downwards, the shifting fork 11 pushes the cleaning ring 18 downwards, and the cleaning ring 18 falls into the screw rod cavity 24.

Because of the existence of the heating ring 4, the temperature in the extruder is high in the working process, and the materials cannot be directly contacted due to the nature of the materials, so that the control of the cleaning ring 18 falling into the screw cavity 24 through the controller is particularly important. Wherein the right side of the extruder body 2 is provided with an openable door, which is opened, and when the cleaning ring 18 falls into the screw cavity 24, a new cleaning ring 18 is sleeved on the first screw rod 3 and the second screw rod 16, thereby completing the replacement work of the cleaning ring 18, and the structure of the cleaning ring 18 is as shown in fig. 5. Wherein the cleaning ring 18 is made of flexible material, when the cleaning ring is installed, the upper end of the cleaning ring 18 is in adhesive connection, the cleaning ring 18 is sleeved on the first screw rod 3 and the second screw rod 16 by separating the upper end of the cleaning ring 18, and then the upper end of the cleaning ring 18 is adhered, so that the cleaning ring 18 is fixed.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.