CN212603281U - Metering device for feeding of extruder - Google Patents

Abstract

The utility model relates to a plastics processing equipment field especially relates to a metering device that extruder material loading was used, including the measurement hopper, the upper end of measurement hopper is fixed with the inlet pipe, the inlet pipe passes through bellows joint on the discharge gate of auto sucking machine, be fixed with the solenoid valve on the inlet pipe, be fixed with the PLC controller on the mounting bracket, the solenoid valve is connected with the PLC controller electricity, be fixed with the discharging pipe on the lower extreme outer wall of measurement hopper, the discharging pipe lower extreme is connected with the passage, the passage is close to and is fixed with servo motor on the one end terminal surface of measurement hopper, servo motor is connected with the PLC controller electricity, be provided with in the passage and be used for sending the material feeding unit of extruder feed inlet department with the raw materials in the measurement hopper, be provided with wheeled meter rice ware on the mounting bracket, wheeled meter rice ware is connected with the PLC equipment electricity, the gyro wheel of wheeled meter: the uniformity of the thickness of the pipe wall is ensured, and the product quality is improved.

Description

Metering device for feeding of extruder

Technical Field

The utility model belongs to the technical field of the technique of plastics processing equipment and specifically relates to a metering device that extruder material loading was used is related to.

Background

In recent years, with the development of the plastic industry, the market share of plastic products such as films, pipes, cables, profiles and the like is gradually expanded, and the plastic products become widely recognized products everywhere. However, as they developed, some problems have increasingly emerged. On one hand, the production raw materials have few varieties, unstable quality, large price fluctuation and lack of special materials. On the other hand, the product quality cannot be guaranteed finally due to unreasonable product structure and production scale caused by poor production equipment, and the most critical step influencing the product quality is the product extrusion molding process, which is to strictly control the product blanking weight per meter, properly control the weight per meter and ensure higher quality of the extrusion molded product.

Notice No. CN 205553134U's utility model relates to an extruder loading attachment, extruder loading attachment includes frame, workbin, spring loading ware, hopper, the workbin erects in the frame, spring loading ware both ends communicate respectively hopper and workbin, the workbin bottom is equipped with supplementary feeding mechanism, supplementary feeding mechanism adopts the inclination design with the horizontal direction, the frame is equipped with control panel, be equipped with the inductor in the hopper, the inductor electricity is connected control panel. The utility model discloses a workbin bottom sets up supplementary feeding mechanism, has improved pay-off efficiency, just the inductor detectable the accumulation situation of raw materials in the hopper, through control panel automatically regulated pay-off speed avoids the raw materials to be in accumulation is too much in the hopper, has also saved electric power.

However, the above patents have the following drawbacks: when an existing pipe manufacturer uses the extruder feeding device disclosed in the above patents, because the thickness of the pipe wall of a PE pipe needs to be strictly controlled according to relevant standards in the production of the PE pipe, the thickness of the pipe wall is uniform and consistent, the extruding speed is closely related to the feeding speed of a hopper, the feeding speed of the hopper is high, the extruding speed of the extruder is low, so that the feeding is excessive, the thickness of the pipe is thickened, the pipe wall is thinned due to insufficient feeding of the hopper, and the production requirement is not met, so that the extruding speed of the extruder and the feeding speed of the hopper need to be balanced and allocated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a metering device that extruder material loading was used, improvement product quality's effect that has not enough to prior art exists.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a metering device for feeding of an extruder comprises a metering hopper fixed on a mounting frame, wherein the upper end of the metering hopper is fixedly provided with an inlet pipe communicated with an inner cavity of the metering hopper, the inlet pipe is connected to a discharge hole of a material suction machine through a corrugated pipe, a solenoid valve for controlling the on-off of the inlet pipe is fixed on the inlet pipe, a PLC (programmable logic controller) is fixed on the mounting frame, the solenoid valve is electrically connected with the PLC, a discharge pipe communicated with the inner cavity of the metering hopper is fixed on the outer wall of the lower end of the metering hopper, the lower end of the discharge pipe is connected with a guide pipe with two closed ends, the axis of the guide pipe is perpendicular to the discharge pipe, a servo motor is fixed on the end surface of one end of the guide pipe close to the metering hopper, the servo motor is electrically connected with the PLC, and a feeding device for feeding raw materials in, the mounting frame is provided with a wheel type meter counter, the wheel type meter counter is electrically connected with the PLC equipment, and a roller of the wheel type meter counter is positioned above a discharge port of the extruder.

By adopting the technical scheme, when quantitative feeding is required to be carried out in a bin of the extruder, the corresponding relation between the weight of raw material particles and the rotating speed and time of the servo motor is set in the PLC equipment in advance, so as to control the electromagnetic valve, the product of the rotating speed and the rotating time of the servo motor is the weight of the raw material particles conveyed into the extruder, when the raw material in the metering hopper reaches the weight of the raw material required for extruding a pipe of one meter, the PLC controller drives the electromagnetic valve to separate the feeding pipe from the suction machine and drive the servo motor to rotate, the raw material in the metering hopper is conveyed into the bin of the extruder through the feeding device, in order to ensure that the wall thickness of the extruded PE pipe is uniform, the extruding speed of the extruder and the length of the extruded PE pipe are fed back through the wheel type meter counter, so as to transmit the fed back information to the PLC controller for processing, and the rotating speed of the servo motor is adjusted through the PLC controller, thereby realize the volume of control transport raw materials, feedback regulation each other between servo motor, solenoid valve and the wheeled meter rice ware three to it is even unanimous to have ensured the wall thickness, has improved product quality.

The utility model discloses further set up to: the feeding device comprises a connecting pipe, a round rod, a feeding plate and a discharging pipe, wherein the connecting pipe is fixed on the outer wall of the material guide pipe and communicated with the inner cavity of the material guide pipe, the round rod is rotated in the material guide pipe, the feeding plate is fixed on the round rod, the discharging pipe is fixed on the outer wall of one end of the material guide pipe, the discharging pipe is connected with a discharging pipe conveniently, one end of the round rod stretches out of the material guide pipe and is fixedly connected with the rotating shaft of the servo motor, the feeding plate is spiral along the length direction of the round rod, one end of the discharging pipe is far away from the discharging pipe, and one end of the discharging pipe stretches into the feeding port of the extruder, and the discharging pipe and the connecting.

Through adopting above-mentioned technical scheme, when needs send the raw materials in the measurement hopper to the feed bin of extruder in, drive servo motor work to round bar rotates together with the delivery sheet, because the delivery sheet is the heliciform, the raw materials in the measurement hopper flows along the discharging pipe, then raw materials granule flows in the inner chamber of passage along the connecting pipe, under rotatory delivery sheet effect, the raw materials flows in the feed bin of extruder from the unloading pipe.

The utility model discloses further set up to: dial material piece including fix the mounting panel in the connecting tube, set up guiding hole, the ejector pin of vertical slip on the mounting panel in the guiding hole, set up and be used for driving the vertical gliding driving piece from top to bottom of ejector pin below, the axis of guiding hole is the coincidence setting with the axis of connecting pipe, the upper end of ejector pin is located the inner chamber of measurement hopper, the lower extreme of ejector pin is located the below of mounting panel.

Through adopting above-mentioned technical scheme, the in-process of measurement hopper unloading through the driving piece for the ejector pin slides from top to bottom along the axial of guiding hole is vertical, thereby the ejector pin is reciprocating motion in the connecting tube, thereby makes the discharging pipe be difficult to be blockked up, makes the unloading more smooth and easy.

The utility model discloses further set up to: the driving piece comprises a spring, a circular plate and a cam, wherein the spring is sleeved on the outer wall of the lower end of the ejector rod, the circular plate is fixed on the lower end face of the ejector rod, the cam is coaxially fixed on the circular rod, one end of the spring is fixed on the bottom face of the mounting plate, the other end of the spring is fixed on the upper surface of the circular plate, and the wheel face of the cam abuts against the bottom face of the.

Through adopting above-mentioned technical scheme, when servo motor drive round bar rotated, round bar rotated together with the cam, and the bottom surface of plectane is being supported to the cam for the ejector pin slides from top to bottom along the axis of guiding hole is vertical, thereby makes in the discharging tube be difficult to blockked up.

The utility model discloses further set up to: the bottom surface of the circular plate is provided with a groove, a pulley rotates in the groove, and the wheel surface of the pulley is attached to the wheel surface of the cam.

Through adopting above-mentioned technical scheme, the pulley has reduced the wearing and tearing between cam and the plectane, has improved the life of plectane and cam.

The utility model discloses further set up to: the retaining member includes that a plurality of sets up caulking groove, slip on discharging pipe lower extreme outer wall and inlays the ball of establishing in the caulking groove, sets up and be used for driving the ball outside the discharging pipe and support the butt piece tightly on the connecting pipe outer wall, the inner wall of caulking groove intercommunication discharging pipe.

Through adopting above-mentioned technical scheme, fix the discharging pipe on the connecting pipe, through the butt piece for the ball rolls towards the direction that is close to the connecting pipe in the caulking groove, and is pressed from both sides tightly between a plurality of ball until the connecting pipe, and the installation has just been accomplished this moment.

The utility model discloses further set up to: the butt joint piece includes the coaxial installation cover that sets up on the discharge pipe outer wall, the butt cover of coaxial fixation on the installation cover inner wall, butt cover threaded connection is on the discharging pipe, the lower terminal surface butt of butt cover is on the outer wall of ball.

Through adopting above-mentioned technical scheme, when needs are fixed the discharging pipe on the connecting pipe, establish the discharging pipe outside the connecting pipe earlier, then rotate the installation cover for the installation cover is vertical downward slip together with the butt cover, thereby the lower extreme inclined plane of butt cover supports the ball orientation tightly near the direction of connecting pipe, thereby makes the connecting pipe tightly pressed from both sides between a plurality of ball, makes to be difficult to break away from between discharging pipe and the connecting pipe.

The utility model discloses further set up to: the bottom surface of the abutting sleeve is obliquely arranged towards one side of the ball, and a plurality of convex strips are fixed on the outer wall of the mounting sleeve.

Through adopting above-mentioned technical scheme, the butt cover is convenient for the butt ball more and supports tightly towards the direction that is close to the connecting pipe, and the sand grip has increased the frictional force between installer palm and the installation cover to the installer of being convenient for more rotates the installation cover.

To sum up, the utility model discloses a beneficial technological effect does: the servo motor, the electromagnetic valve and the wheel type meter counter are subjected to feedback adjustment mutually, so that the uniformity and consistency of the thickness of the pipe wall are ensured, and the product quality is improved; by arranging the ejector rod, the discharging pipe is difficult to block, so that the discharging is smoother; by arranging the roller, the abrasion between the cam and the circular plate is reduced, and the service lives of the circular plate and the cam are prolonged; through the arrangement of the ball, the abutting sleeve and the mounting sleeve, a worker can conveniently connect the discharge pipe with the connecting pipe; through setting up the sand grip, increased the frictional force between installer palm and the installation cover to the installer of being convenient for more rotates the installation cover.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a sectional view of the present embodiment at the position of the connecting pipe;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a partially enlarged view at B in fig. 2.

Reference numerals: 1. a mounting frame; 2. a metering hopper; 3. a feed pipe; 4. an electromagnetic valve; 5. a PLC controller; 6. a discharge pipe; 7. a material guide pipe; 8. a servo motor; 9. a feeding device; 10. a wheel type meter counter; 11. a connecting pipe; 12. a round bar; 13. a feeding plate; 14. a discharging pipe; 15. a locking member; 16. material stirring parts; 17. mounting a plate; 18. a guide hole; 19. a top rod; 20. a drive member; 21. a spring; 22. a circular plate; 23. a cam; 24. a groove; 25. a pulley; 26. caulking grooves; 27. a ball bearing; 28. an abutting member; 29. installing a sleeve; 30. a butting sleeve; 31. and (4) raised strips.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, for the utility model discloses a metering device that extruder material loading was used, including fixing the measurement hopper 2 on mounting bracket 1, one side at the extruder is placed to mounting bracket 1, mounting bracket 1 is located the below of auto sucking machine discharge gate, measurement hopper 2 is fixed on mounting bracket 1, the upper end of measurement hopper 2 is fixed with inlet pipe 3, inlet pipe 3 and measurement hopper 2's inner chamber intercommunication, the lower extreme of measurement hopper 2 is fixed with discharging pipe 6, discharging pipe 6 and measurement hopper 2's inner chamber intercommunication, when needs are to the feeding in the extruder, at first inhale the feed bin to the auto sucking machine with plastic granules through the auto sucking machine in, then fall into the inner chamber of measurement hopper 2 from the feed bin of auto sucking machine, at last from the measurement hopper 2 send to the feed inlet of extruder in.

As shown in fig. 1, a solenoid valve 4 is fixed on a feeding pipe 3, a PLC controller 5 is fixed on a mounting frame 1, the solenoid valve 4 is electrically connected to the PLC controller 5, a material guiding pipe 7 is arranged below a material discharging pipe 6, the axis of the material guiding pipe 7 is perpendicular to the axis of the material discharging pipe 6, the material guiding pipe 7 is a circular pipe with two closed ends, one end of the material guiding pipe 7 is located below the material discharging pipe 6, the other end is located above a feed inlet of the extruder, the material guiding pipe 7 is fixed on the mounting frame 1, a servo motor 8 is fixed on the outer wall of one end of the material guiding pipe 7 close to the material discharging pipe 6, the servo motor 8 is electrically connected to the PLC controller 5, a feeding device 9 for feeding the raw material in the metering hopper 2 to the feed inlet of the extruder is arranged in the material guiding pipe 7, a wheel type meter 10 is fixed on one end of the mounting frame 1 far away from the, the wheel surface of a roller of the wheel type meter counter 10 is attached to the outer wall of the PE pipe, the wheel type meter counter 10 is electrically connected with the PLC equipment, it is known that the weight of raw material particles is 17.7 kilograms when a pipe is extruded for one meter in the existing production, in order to enable the wall thickness of the extruded PE pipe to be uniform, the extrusion speed of the extruder and the length of the extruded PE pipe are fed back through the wheel type meter counter 10, the fed-back information is transmitted to the PLC controller 5 to be processed, the rotating speed of the servo motor 8 is adjusted through the PLC controller 5, and the quantity of the conveyed raw materials is controlled through the rotating speed of the servo motor 8.

As shown in fig. 1, by setting the corresponding relationship between the weight of the raw material particles and the rotation speed and time of the servo motor 8 in the PLC device in advance, the solenoid valve 4 is controlled, the product of the rotation speed and the rotation time of the servo motor 8 is the weight of the raw material particles conveyed into the extruder, when the conveyed weight reaches 17.7 kg, the PLC controller 5 drives the solenoid valve 4 to separate the feeding pipe 3 from the suction machine, so that the feeding pipe 3 is conducted with the suction machine again until the raw material in the metering hopper 2 is conveyed, the feeding pipe 3 is conducted with the suction machine from the conducting to the closing time, that is, the feeding time of the suction machine into the metering hopper 2, the pipe diameter of the feeding pipe 3 is set in advance, so that the weight of the raw material fed into the metering hopper 2 from the conducting to the closing time is exactly equal to the weight of the raw material extruded one meter of pipe, the servo motor 8, the electromagnetic valve 4 and the wheel type meter counter 10 are mutually fed back and adjusted, so that the uniformity and consistency of the thickness of the pipe wall of the extruded PE pipe are guaranteed, and the product quality is improved.

As shown in fig. 1 and fig. 2, the feeding device 9 includes a connecting pipe 11, a round bar 12, a feeding plate 13 and a discharging pipe 14, the connecting pipe 11 is fixed on an outer wall of one end of the material guiding pipe 7 close to the servo motor 8, the connecting pipe 11 is communicated with an inner cavity of the material guiding pipe 7, the round bar 12 rotates in the material guiding pipe 7, one end of the round bar 12 extends out of the material guiding pipe 7 and is coaxially and fixedly connected with the servo motor 8, the feeding plate 13 is fixed on an outer wall of the round bar 12, the feeding plate 13 is spirally wound on the outer wall of the round bar 12 along an axis of the round bar 12, one end of the discharging pipe 14 is communicated with the inner cavity of the material guiding pipe 7, and the other end extends into a feeding port of the extruder, so that when the raw material in the metering hopper 2 needs to be fed into a storage bin of the extruder, the servo motor 8 is driven to work, the round bar 12 rotates together with the feeding plate 13, because the feeding plate, the raw material particles then flow into the inner cavity of the material guiding pipe 7 along the connecting pipe 11, and flow into the bin of the extruder from the blanking pipe 14 under the action of the rotating feeding plate 13.

As shown in fig. 3, a locking member 15 for connecting the discharging pipe 6 to the connecting pipe 11 is disposed on the discharging pipe 6, the locking member 15 includes an caulking groove 26, a ball 27 and a butting member 28 disposed outside the discharging pipe 6 and used for driving the ball 27 to butt against the outer wall of the connecting pipe 11, a plurality of caulking grooves 26 are disposed on the outer wall of the lower end of the discharging pipe 6, the plurality of caulking grooves 26 are circularly distributed around the axis of the discharging pipe 6, the caulking grooves 26 communicate with the inner wall of the discharging pipe 6, the ball 27 is slidably embedded in the caulking grooves 26, the butting member 28 includes a mounting sleeve 29 and a butting sleeve 30, the mounting sleeve 29 is coaxially sleeved on the outer wall of the discharging pipe 6, a plurality of convex strips 31 are fixed on the outer wall of the mounting sleeve 29, the convex strips 31 increase the friction between the palm and the mounting sleeve 29, thereby facilitating the worker to rotate the mounting sleeve 29, the butting sleeve 30 is coaxially fixed on the inner wall of, the bottom surface of butt cover 30 is slope setting towards ball 27 one side, the bottom surface butt of butt cover 30 is on the outer wall of ball 27, thereby when needs fix discharging pipe 6 on connecting pipe 11, establish discharging pipe 6 cover outside connecting pipe 11 earlier, then rotate installation cover 29, make installation cover 29 and butt cover 30 vertical lapse down together, thereby the lower extreme inclined plane of butt cover 30 supports ball 27 orientation near the direction of connecting pipe 11 tightly, thereby make connecting pipe 11 pressed from both sides tightly between a plurality of ball 27, make and be difficult to break away from between discharging pipe 6 and the connecting pipe 11.

As shown in fig. 3 and 4, a material pulling member 16 for preventing the material discharging pipe 6 from being blocked is disposed at a joint of the material discharging pipe 6 and the material guiding pipe 7, the material pulling member 16 includes a mounting plate 17, a guide hole 18, a push rod 19 and a driving member 20 disposed below the push rod 19 and used for driving the push rod 19 to vertically slide up and down, the mounting plate 17 is fixed on an inner wall of the connecting pipe 11, a length direction of the mounting plate 17 is perpendicular to a vertical direction, the guide hole 18 is disposed on the mounting plate 17 in a penetrating manner, an axis of the guide hole 18 is coincident with an axis of the connecting pipe 11, the push rod 19 vertically slides in the guide hole 18, an upper end of the push rod 19 is located in an inner cavity of the measuring hopper 2 (shown in fig. 1), and a lower end of.

As shown in fig. 3 and 4, the driving member 20 includes a spring 21, a circular plate 22 and a cam 23, the spring 21 is sleeved on the outer wall of the lower end of the ejector rod 19, the circular plate 22 is fixed at the bottom end of the ejector rod 19, one end of the spring 21 is fixed on the bottom surface of the mounting plate 17, the other end of the spring 21 is fixed on the upper surface of the circular plate 22, a groove 24 is formed in the bottom surface of the circular plate 22, a pulley 25 is rotatably connected to the groove 24, the cam 23 is coaxially fixed on the circular rod 12, and the wheel surface of the cam 23 is attached to the wheel surface of the pulley 25, so that the circular rod 12 and the cam 23 rotate together while the servo motor 8 drives the circular rod 12 to rotate, the cam 23 abuts against the pulley 25, the ejector rod 19 vertically slides up and.

The implementation principle of the embodiment is as follows: when raw material particles in a feed bin of a suction machine are required to be quantitatively conveyed into a granary of an extruder, a PLC (programmable logic controller) 5 is started, the PLC 5 controls an electromagnetic valve 4 to enable a feeding pipe 3 to be communicated with the feed bin of the suction machine, so that the raw material in the feed bin of the suction machine enters a metering hopper 2, meanwhile, a servo motor 8 rotates to drive a round rod 12 to rotate, so that the round rod 12 and a feeding plate 13 rotate together, the feeding plate 13 is spiral, the raw material in the metering hopper 2 flows out along a discharging pipe 6, then the raw material particles flow into an inner cavity of a material guide pipe 7 along a connecting pipe 11, the raw material particles flow into the feed bin of the extruder from a discharging pipe 14 under the action of the rotating feeding plate 13, the extruding speed of the extruder and the length of an extruded PE pipe are fed back through a wheel type meter 10, the fed back information is transmitted to the PLC 5 to be processed, and the rotating speed of the servo motor 8 is, the quantity of the raw materials is controlled by the rotating speed of the servo motor 8, and the servo motor 8, the electromagnetic valve 4 and the wheel type meter counter 10 are subjected to feedback adjustment, so that the thickness of the pipe wall of the extruded PE pipe is uniform and consistent, and the product quality is improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a metering device that extruder material loading was used, is including fixing measurement hopper (2) on mounting bracket (1), its characterized in that: the upper end of the metering hopper (2) is fixed with an inlet pipe (3) communicated with an inner cavity of the metering hopper, the inlet pipe (3) is connected to a discharge hole of the suction machine through a corrugated pipe, a solenoid valve (4) used for controlling the on-off of the inlet pipe (3) is fixed on the inlet pipe (3), a PLC (programmable logic controller) (5) is fixed on the mounting rack (1), the solenoid valve (4) is electrically connected with the PLC controller (5), a discharge pipe (6) communicated with the inner cavity of the metering hopper (2) is fixed on the outer wall of the lower end of the metering hopper (2), the lower end of the discharge pipe (6) is connected with a guide pipe (7) with two closed ends, the axis of the guide pipe (7) is vertically arranged with the discharge pipe (6), a servo motor (8) is fixed on the end face of the guide pipe (7) close to one end of the metering hopper (2), the material guide pipe (7) is internally provided with a feeding device (9) used for conveying raw materials in the metering hopper (2) to the feed inlet of the extruder, the mounting frame (1) is provided with a wheel type meter counter (10), the wheel type meter counter (10) is electrically connected with the PLC equipment, and a roller of the wheel type meter counter (10) is positioned above the discharge outlet of the extruder.

2. A metering device for feeding an extruder according to claim 1, characterized in that: material feeding unit (9) including fix connecting pipe (11) rather than the inner chamber intercommunication on passage (7) outer wall, rotate round bar (12) in passage (7), fix delivery sheet (13) on round bar (12), fix unloading pipe (14) on passage (7) keep away from servo motor (8) one end outer wall, connecting pipe (11) and discharging pipe (6) intercommunication, be provided with retaining member (15) of being convenient for connect discharging pipe (6) on connecting pipe (11) on discharging pipe (6), round bar (12) one end stretch out outside passage (7) and with the coaxial fixed connection of pivot of servo motor (8), delivery sheet (13) are the heliciform along the length direction of round bar (12), unloading pipe (14) are kept away from passage (7) one end and are stretched into the inlet of extruder discharging pipe, the junction of passage (6) and passage (7) is provided with the material of dialling (16) that prevent discharging pipe (6) jam .

3. A metering device for feeding an extruder according to claim 2, characterized in that: dial material spare (16) including fixing mounting panel (17) in connecting pipe (11), set up guiding hole (18) on mounting panel (17), vertical slip ejector pin (19) in guiding hole (18), set up and be used for driving ejector pin (19) vertical gliding driving piece (20) from top to bottom in ejector pin (19) below, the axis of guiding hole (18) is the coincidence setting with the axis of connecting pipe (11), the upper end of ejector pin (19) is located the inner chamber of measurement hopper (2), the lower extreme of ejector pin (19) is located the below of mounting panel (17).

4. A metering device for feeding an extruder according to claim 3, characterized in that: the driving piece (20) comprises a spring (21) sleeved on the outer wall of the lower end of the ejector rod (19), a circular plate (22) fixed on the lower end face of the ejector rod (19), and a cam (23) coaxially fixed on the circular rod (12), wherein one end of the spring (21) is fixed on the bottom face of the mounting plate (17), the other end of the spring is fixed on the upper surface of the circular plate (22), and the wheel face of the cam (23) abuts against the bottom face of the circular plate (22).

5. A metering device for feeding extruder according to claim 4, characterized in that: a groove (24) is formed in the bottom surface of the circular plate (22), a pulley (25) rotates in the groove (24), and the wheel surface of the pulley (25) is attached to the wheel surface of the cam (23).

6. A metering device for feeding an extruder according to claim 2, characterized in that: retaining member (15) include that caulking groove (26), the slip of a plurality of division on discharging pipe (6) lower extreme outer wall establish ball (27) in caulking groove (26), set up at discharging pipe (6) external use in drive ball (27) support butt piece (28) tight on connecting pipe (11) outer wall, caulking groove (26) communicate the inner wall of discharging pipe (6).

7. A metering device for feeding extruder according to claim 6, characterized in that: the butt joint piece (28) comprises a mounting sleeve (29) coaxially arranged on the outer wall of the discharge pipe (6) and a butt joint sleeve (30) coaxially fixed on the inner wall of the mounting sleeve (29), the butt joint sleeve (30) is in threaded connection with the discharge pipe (6), and the lower end face of the butt joint sleeve (30) is in butt joint with the outer wall of the ball (27).

8. A metering device for feeding extruder according to claim 7, characterized in that: the bottom surface of the abutting sleeve (30) is obliquely arranged towards one side of the ball (27), and a plurality of convex strips (31) are fixed on the outer wall of the mounting sleeve (29).

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