Double-screw feeding machine

Abstract

The invention relates to the technical field of material conveying, in particular to a double-screw feeding machine which comprises a machine body, a conveying cavity is formed in the machine body, a pair of conveying augers used for conveying materials are arranged in the conveying cavity side by side, and each conveying auger comprises a main shaft capable of rotating. A main shaft is arranged on the machine body, spiral blades used for pushing materials to move through self rotation are spirally arranged on the outer surface of the main shaft, a hollow cavity is formed in the main shaft, a pushing rod sliding along the interior of the hollow cavity is arranged on the machine body, and a main knocking device used for knocking the main shaft is arranged on the pushing rod. The blade knocking device and the main knocking device are used for knocking and vibrating the conveying auger, so that residual materials adhered to the surface of the conveying auger can effectively fall off, meanwhile, the bridging phenomenon of the materials can be avoided, and the material conveying precision can be guaranteed while the equipment is kept clean; and residual materials in the conveying cavity can be effectively discharged through airflow, so that the trouble of manually disassembling equipment for maintenance is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of material conveying, in particular to a double-spiral feeding machine. BACKGROUND

[0002] The double-spiral feeding machine can transport materials through two parallel arranged conveying augers, and is mainly used for quantitatively transporting powders and granules in the chemical industry.

[0003] The application with the publication number CN210456293U provides a double-spiral feeding machine which can quantitatively transport powders with high precision and low energy consumption. However, the following problems affecting the precision and quality of material transportation may occur during the transportation of powders by the device:

[0004] 1. The device lacks a function of vibrating the materials, and it is difficult to avoid the bridging phenomenon of the materials at the discharge port, so it is difficult to further guarantee the precision of material transportation;

[0005] 2. The device lacks an automatic ability of cleaning the residual materials remaining on the surface of the conveying auger, and is prone to problems such as contamination between materials, so manual cleaning is required, resulting in great maintenance difficulty.

[0006] Therefore, it is difficult to meet the existing use and maintenance requirements. In view of this, the application provides a double-spiral feeding machine which is convenient for vibrating and cleaning materials. SUMMARY

[0007] The application aims to provide a double-spiral feeding machine to solve the problems in the background.

[0008] To achieve the above-mentioned purpose, the application provides the following technical scheme: a double-spiral feeding machine, comprising a machine body, a conveying cavity is formed in the machine body, and a pair of conveying augers for conveying materials are arranged side by side in the conveying cavity, the conveying auger comprises a main shaft capable of rotating, and the outer surface of the main shaft is provided with a spiral blade for pushing the movement of materials by itself rotation, a hollow cavity is formed in the inside of the main shaft, and a push rod is arranged on the machine body and slides along the inside of the hollow cavity, a gas delivery channel is arranged in the inside of the push rod, the front end of the gas delivery channel is in communication with the output end of a high-pressure gas pump, an exhaust valve is installed at the rear end of the gas delivery channel, a main knocking device for knocking the main shaft is arranged on the push rod, the main knocking device comprises a guide tube fixedly protruding from the surface of the push rod, and a punch hammer for knocking the inner wall of the hollow cavity by using gas is slidably installed in the guide tube, the bottom of the punch hammer is sealed with the gas delivery channel by a sealing film, and the bottom of the punch hammer is connected with the inner wall of the gas delivery channel by a second return spring.

[0009] Optionally, a controller is fixedly installed on the machine body, and the controller is electrically connected with the high-pressure gas pump and the exhaust valve respectively.

[0010] Optionally, the interior of the spiral blade is provided with a spiral groove in communication with the hollow cavity, and a blade knocking device for knocking the spiral blade is arranged in the spiral groove, the blade knocking device comprises a connecting frame fixed at the bottom of the spiral groove, and a hinged rod is hingedly installed on the connecting frame, the end of the hinged rod is provided with a flail for knocking the spiral blade under the extrusion of the guide pipe, and a first reset spring is arranged between the hinged rod and the connecting frame.

[0011] Optionally, the cross section of the guide pipe is circular or elliptical, and an arc-shaped guide wing for guiding the flail to slide away from the contact state with the guide pipe from the side surface of the guide pipe is arranged at the edge of the flail.

[0012] Optionally, the main knocking devices are equidistantly arranged along the axial direction of the pushing rod, and the blade knocking devices are equidistantly arranged along the bottom of the spiral groove, the distance between adjacent main knocking devices is the same as the pitch of the spiral blade, the number of the array of the main knocking devices is the same as the number of turns of the spiral blade, and at least two blade knocking devices are equidistantly arranged in the spiral groove at positions corresponding to adjacent two main knocking devices.

[0013] Optionally, the machine body is fixedly provided with a feeding hopper at the feeding port corresponding to the conveying cavity, and a feeding valve is arranged on the feeding hopper, the machine body is fixedly provided with a discharging pipe at the discharging port corresponding to the conveying cavity, and a discharging valve is fixedly arranged on the discharging pipe, a gas guiding device is arranged in the machine body and inserted into the conveying cavity, a high-pressure gas pump sprays and cleans the material on the surface of the conveying auger through the gas guiding device, and the controller is electrically connected with the feeding valve and the discharging valve.

[0014] Optionally, the machine body is provided with a mounting cavity in communication with the conveying cavity, and the gas guiding device comprises a hollow pipe rotatably mounted in the mounting cavity, and a pair of arc-shaped matching grooves matching the shape of the inner wall of the conveying cavity are symmetrically arranged on the surface of the hollow pipe, there is only one arc-shaped matching groove on each hollow pipe, and a gas delivery hole connected with the high-pressure gas pump and used for spraying gas to the surface of the conveying auger is equidistantly arranged on the arc-shaped matching groove, a second adjusting motor for driving the hollow pipe to rotate is fixedly arranged on the machine body, and the controller is electrically connected with the second adjusting motor.

[0015] Optionally, an exhaust device is arranged above the discharging pipe, the exhaust device comprises an exhaust hood fixedly connected with the machine body, an exhaust cavity in communication with the top of the conveying cavity is arranged in the exhaust hood, a filter screen for filtering gas flow is arranged at the bottom of the exhaust cavity, an exhaust pump for pumping out the gas in the exhaust cavity is fixedly arranged at the top of the exhaust hood, and the controller is electrically connected with the exhaust pump.

[0016] Optionally, the exhaust cavity is provided with a cleaning device for cleaning the filter screen, and the cleaning device comprises a rotating shaft rotatably installed in the exhaust cavity, and a first adjusting motor is fixedly installed in the exhaust cavity for driving the rotating shaft to rotate, a closing cover for closing the filter screen is fixedly installed on the rotating shaft, and a cleaning motor is fixedly installed on the rotating shaft, and the output end of the cleaning motor is driven by a cam for knocking the filter screen, and the controller is electrically connected with the first adjusting motor and the cleaning motor respectively.

[0017] Optionally, a driving motor is fixedly installed on the machine body for driving the main shaft to rotate, and an adjusting push rod is fixedly installed on the machine body for driving the push rod to move, and the controller is electrically connected with the driving motor and the adjusting push rod respectively.

[0018] Compared with the prior art, the double-spiral feeding machine has the following beneficial effects:

[0019] 1. The knocking vibration of the conveying auger by the blade knocking device and the main knocking device can effectively make the residual material adhered to the surface of the conveying auger fall off, and can avoid the bridging phenomenon of the material, so that the device is kept clean and the precision of material transportation is ensured.

[0020] 2. The residual material in the conveying cavity can be effectively discharged by air flow through the cooperation of the high-pressure air pump, the air guide device and the exhaust device, so that the trouble of manually disassembling the device for maintenance is avoided, and the maintenance difficulty is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the present application;

[0022] Figure 2 is a structural side view of the present application;

[0023] Figure 3 is a cross-sectional view of the machine body of the present application;

[0024] Figure 4 is a structural schematic view of the air guide device of the present application;

[0025] Figure 5 is a structural schematic view of the conveying auger of the present application;

[0026] Figure 6 is an installation schematic view of the knocking device and the push rod of the present application;

[0027] Figure 7 is a cross-sectional view of the conveying auger and the push rod of the present application;

[0028] Figure 8 is Figure 7 is an enlarged schematic view of area A in the above figure;

[0029] Figure 9 Structure diagram of the blade knocking device of the present application;

[0030] Figure 10 Internal section view of the exhaust device of the present application;

[0031] Figure 11 Structure diagram of the cleaning device of the present application.

[0032] In the figure: 1, conveying cavity; 2, cleaning device; 201, cam; 202, cleaning motor; 203, rotating shaft; 204, closed cover; 3, exhaust device; 301, exhaust pump; 302, exhaust cavity; 303, exhaust cover; 304, filter screen; 4, blade knocking device; 401, connecting frame; 402, first return spring; 403, hinged rod; 404, swinging hammer; 405, arc-shaped guiding side wing; 5, air guiding device; 501, air feeding hole; 502, hollow tube; 503, arc-shaped matching groove; 6, conveying auger; 601, helical groove; 602, helical blade; 603, hollow cavity; 604, main shaft; 7, main knocking device; 701, impact hammer; 702, guiding tube; 703, closed membrane; 704, second return spring; 8, mounting cavity; 9, driving motor; 10, first adjusting motor; 11, pushing rod; 12, air feeding passage; 13, exhaust valve; 14, feeding hopper; 15, high-pressure air pump; 16, machine body; 17, discharging valve; 18, discharging pipe; 19, adjusting pushing rod; 20, feeding valve; 21, controller; 22, second adjusting motor. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions of the present application clear, complete and describe its advantages more clearly, the following will further describe the embodiments of the present application in combination with the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, not all embodiments, and are only used to explain the embodiments of the present application, and do not limit the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0034] Embodiment one: please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8The application provides a double-helix feeding machine, which comprises a machine body 16, a conveying cavity 1 is formed in the machine body 16, a pair of conveying augers 6 for conveying materials are arranged side by side in the conveying cavity 1, the materials are poured into the conveying cavity 1 through the feeding port of the conveying cavity 1 and then move to the discharging port of the conveying cavity 1 under the pushing of the conveying augers 6, the conveying auger 6 comprises a main shaft 604 capable of rotating, the outer surface of the main shaft 604 is provided with helical blades 602 for pushing the materials to move by rotating the main shaft 604, a hollow cavity 603 is formed in the main shaft 604, a pushing rod 11 is arranged on the machine body 16 and slides along the inside of the hollow cavity 603, a gas feeding channel 12 is arranged in the pushing rod 11, the front end of the gas feeding channel 12 is communicated with the output end of a high-pressure gas pump 15, a gas discharge valve 13 is arranged at the rear end of the gas feeding channel 12, a main knocking device 7 for knocking the main shaft 604 is arranged on the pushing rod 11, the main knocking device 7 comprises a guide pipe 702 fixed on the surface of the pushing rod 11 and protruding from the surface of the pushing rod 11, a percussion hammer 701 is slidably arranged in the guide pipe 702 and is used for knocking the inner wall of the hollow cavity 603 by using gas, the bottom of the percussion hammer 701 is sealed with the gas feeding channel 12 through a sealing film 703, the bottom of the percussion hammer 701 is connected with the inner wall of the gas feeding channel 12 through a second reset spring 704, a controller 21 is fixedly arranged on the machine body 16 and is electrically connected with the high-pressure gas pump 15 and the gas discharge valve 13. A driving motor 9 for driving the main shaft 604 to rotate is fixedly arranged on the machine body 16, an adjusting push rod 19 for driving the pushing rod 11 to move is fixedly arranged on the machine body 16, and the controller 21 is electrically connected with the driving motor 9 and the adjusting push rod 19. The knocking of the main knocking device 7 can make the materials adhered to the surfaces of the main shaft 604 and the helical blades 602 separate from the conveying auger 6 under vibration, so that the materials are conveniently cleaned. Specifically, when cleaning is needed, the conveying auger 6 still keeps rotating, at this moment, the pushing rod 11 will change the position of the main knocking device 7 under the pushing of the adjusting push rod 19, so that the main knocking device 7 can knock different positions of the inner wall of the hollow cavity 603, when knocking, the high-pressure gas pump 15 rapidly sends high-pressure gas into the gas feeding channel 12, the high-pressure gas in the gas feeding channel 12 will push the end of the percussion hammer 701 out of the guide pipe 702, so that the end of the percussion hammer 701 can impact on the inner wall of the hollow cavity 603 to realize knocking, then the high-pressure gas pump 15 stops working, the gas discharge valve 13 discharges the high-pressure gas in the gas feeding channel 12, and the percussion hammer 701 will be retracted into the guide pipe 702 under the pulling of the second reset spring 704, waiting for the next round of knocking, therefore, the materials adhered to the surfaces of the conveying auger 6 can be separated from the adhering state through the knocking of the main knocking device 7.And in the process, no need for manual opening of the body 16 for manual cleaning, directly acting on the inside of the conveying auger 6 knock can also be more accurate to achieve the purpose of shaking material, compared to the traditional way of knocking the body 16 by external equipment is more efficient and energy saving, but also more convenient and accurate control of the strength of the knock, avoid the deformation of the conveying auger 6.

[0035] Example two: please see Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9,On the basis of embodiment one, the inside of the spiral blade 602 is provided with a spiral groove 601 communicated with the hollow cavity 603, and the spiral groove 601 is provided with a blade knocking device 4 for knocking the spiral blade 602, the blade knocking device 4 comprises a connecting frame 401 fixed at the bottom of the spiral groove 601, and a hinged rod 403 is hingedly installed on the connecting frame 401, the end of the hinged rod 403 is provided with a flail 404 for knocking the spiral blade 602 under the extrusion of the guide pipe 702, and a first reset spring 402 is installed between the hinged rod 403 and the connecting frame 401. When the conveying auger 6 rotates, the hinged rod 403 will rotate along the axis of the main shaft 604, so the bottom of the flail 404 will gradually press against the surface of the guide pipe 702, so that the first reset spring 402 on the side of the flail 404 is compressed or stretched to store energy, until the flail 404 continues to move and passes the guide pipe 702, at this time the first reset spring 402 will push the flail 404 to move in the opposite direction and knock against the inner wall of the spiral groove 601, so as to cause the spiral blade 602 to vibrate, so that the corresponding part of the spiral blade 602 can be vibrated more accurately, so as to facilitate accurate control of the vibration position, and if the flail 404 is not needed to be knocked by the blade knocking device 4, the push rod 19 can also be adjusted to drive the push rod 11 to move, so as to change the position of the guide pipe 702, so that the guide pipe 702 cannot contact the flail 404, so that the knocking of the spiral blade 602 can be paused, energy can be saved, and the normal work of the conveying auger 6 can be avoided. The cross section of the guide pipe 702 is circular or elliptical, and the edge of the flail 404 is provided with an arc-shaped guide side wing 405 for guiding the flail 404 to slide away from the contact state with the guide pipe 702. By setting the arc-shaped guide side wing 405, the guide pipe 702 can be conveniently guided to move away from the flail 404 along the arc-shaped guide side wing 405, and the end of the guide pipe 702 of the ram 701 can also be provided with a circular arc shape, so as to facilitate the end of the ram 701 and the guide pipe 702 to move away from the contact state with the flail 404 along the bottom of the flail 404. It should be noted that when the flail 404 contacts the guide pipe 702, the ram 701 will not be in the coaxial position with the hinged rod 403, so that even if the ram 701 hammers the flail 404, the hinged rod 403 will only rotate and will not cause the ram 701 and the flail 404 to be stuck.The main knocking devices 7 are equidistantly arranged along the axial direction of the pushing rod 11, and the blade knocking devices 4 are equidistantly arranged along the bottom of the spiral groove 601, the interval between adjacent main knocking devices 7 is the same as the pitch of the spiral blade 602, the number of the array of the main knocking devices 7 is the same as the number of turns of the spiral blade 602, and at least two blade knocking devices 4 are equidistantly arranged in the spiral groove 601 at positions corresponding to the interval between adjacent two main knocking devices 7. With this arrangement, the main knocking devices 7 can knock any point in the effective working area in the hollow cavity 603, and adjusting the position of the pushing rod 11 so that the guide pipe 702 is in contact with the blade knocking devices 4 at different positions can effectively eliminate the dead angle of the knocking vibration, thereby ensuring the cleaning effect of the knocking vibration on the adhered material. In addition, appropriately applying vibration to the material by the main knocking devices 7 during the conveying of the material can effectively avoid the bridging of the material, thereby improving the precision of the material conveying.

[0036] Example three: please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4,On the basis of embodiment two, the body 16 is fixedly installed with a feeding hopper 14 at the feeding port corresponding to the conveying cavity 1, and the feeding hopper 14 is installed with a feeding valve 20; the body 16 is fixedly installed with a discharging pipe 18 at the discharging port corresponding to the conveying cavity 1, and the discharging pipe 18 is fixedly installed with a discharging valve 17; the body 16 is provided with a gas guide device 5 inserted into the conveying cavity 1, and the high-pressure gas pump 15 sprays and blows the material on the surface of the conveying auger 6 through the gas guide device 5, and the controller 21 is electrically connected with the feeding valve 20 and the discharging valve 17 respectively. The body 16 is provided with an installation cavity 8 communicated with the conveying cavity 1, and the gas guide device 5 comprises a hollow pipe 502 rotatably installed in the installation cavity 8, and the surface of the hollow pipe 502 is symmetrically provided with a pair of arc-shaped matching grooves 503 matched with the inner wall of the conveying cavity 1; there is only one arc-shaped matching groove 503 on each hollow pipe 502, and the arc-shaped matching groove 503 is equidistantly provided with a gas sending hole 501 connected with the high-pressure gas pump 15 and used for spraying gas to the surface of the conveying auger 6; the body 16 is fixedly installed with a second adjusting motor 22 used for driving the hollow pipe 502 to rotate, and the controller 21 is electrically connected with the second adjusting motor 22. When the main knocking device 7 and the blade knocking device 4 vibrate and clean the material adhered to the conveying auger 6, the residual material in the conveying cavity 1 can also be cleaned by the high-pressure gas pump 15, specifically, the feeding valve 20 is closed, then the discharging valve 17 is opened, and then the high-pressure gas pump 15 sprays high-pressure gas to the surface of the conveying auger 6 through the gas sending hole 501, so that the high-pressure gas carries the material and is discharged from the discharging pipe 18. In addition, when the arc-shaped matching grooves 503 on the surface of the hollow pipe 502 are aligned with the inner wall of the conveying cavity 1, the hollow pipe 502 will not hinder the normal rotation of the conveying auger 6, and the surface of the region of the hollow pipe 502 where the arc-shaped matching grooves 503 are not arranged is covered with rubber which can deform, which can prevent the material and gas in the conveying cavity 1 from leaking by being attached to the inner wall of the installation cavity 8, and can also reduce the extrusion between the hollow pipe 502 and the conveying auger 6 by deforming when the hollow pipe 502 needs to rotate, so that the hollow pipe 502 can rotate normally. Since only one of the two arc-shaped matching grooves 503 on the hollow pipe 502 is provided with the gas sending hole 501, when gas is not needed to be sent, the arc-shaped matching groove 503 not provided with the gas sending hole 501 is in the state of being aligned with the inner wall of the conveying cavity 1, so as to avoid the gas sending hole 501 from being in contact with the material for a long time, and when the gas needs to be sprayed into the conveying cavity 1, the hollow pipe 502 is rotated by the second adjusting motor 22, so that the arc-shaped matching groove 503 with the gas sending hole 501 is aligned with the inner wall of the conveying cavity 1, so that the gas sending hole 501 can normally spray gas into the conveying cavity 1.

[0037] Embodiment four: please refer to Figure 1 、 Figure 2 、 Figure 3 ,Figure 10 and Figure 11 , on the basis of embodiment three, the body 16 is provided with an exhaust device 3 above the position corresponding to the discharge pipe 18, the exhaust device 3 comprises an exhaust cover 303 fixedly connected with the body 16, and an exhaust cavity 302 is formed in the exhaust cover 303 and communicates with the top of the conveying cavity 1, a filter screen 304 for filtering the airflow is arranged at the bottom of the exhaust cavity 302, an exhaust pump 301 for extracting the gas in the exhaust cavity 302 is fixedly arranged at the top of the exhaust cover 303, and the controller 21 is electrically connected with the exhaust pump 301. The exhaust device 3 can separate the residual material from the gas in the conveying cavity 1. In use, the feeding valve 20 and the discharge valve 17 are both closed, then the high-pressure gas pump 15 sends the gas into the conveying cavity 1 through the gas sending hole 501 to clean the residual material on the surface of the conveying auger 6, and at the same time, the exhaust pump 301 is turned on, at this time, the gas in the conveying cavity 1 will pass through the filter screen 304 and enter the exhaust cavity 302, then be extracted by the exhaust pump 301, and the residual material will gather above the discharge pipe 18 under the filtering of the filter screen 304, then the high-pressure gas pump 15 is turned off and the discharge valve 17 is turned on, so that the residual material can be discharged through the discharge pipe 18. By this method, the gas can be effectively prevented from entering the next stage equipment through the discharge pipe 18, so as to avoid the working interference between the equipment. The exhaust cavity 302 is provided with a cleaning device 2 for cleaning the filter screen 304, and the cleaning device 2 comprises a rotating shaft 203 rotatably arranged in the exhaust cavity 302, a first adjusting motor 10 fixedly arranged in the exhaust cavity 302 for driving the rotating shaft 203 to rotate, a closing cover 204 fixedly arranged on the rotating shaft 203 for closing the filter screen 304, a cleaning motor 202 fixedly arranged on the rotating shaft 203, a cam 201 driven by the output end of the cleaning motor 202 for knocking the filter screen 304, and the controller 21 is electrically connected with the first adjusting motor 10 and the cleaning motor 202 respectively. When the material on the surface of the conveying auger 6 does not need to be cleaned, the first adjusting motor 10 drives the closing cover 204 to rotate to the position aligned with the filter screen 304, so as to close the filter screen 304 by the closing cover 204, thereby avoiding unnecessary impurities from entering the exhaust cavity 302. After the surface of the conveying auger 6 is cleaned by the high-pressure gas pump 15, the first adjusting motor 10 drives the cleaning motor 202 to rotate to the working position, at this time, the cleaning motor 202 can drive the cam 201 to rotate, so as to clean the surface of the filter screen 304 by the cam 201, thereby effectively avoiding the filter screen 304 from being blocked by the residual material. In this way, the filter screen 304 can be effectively maintained by artificial.

[0038] While the forgoing detailed description has set forth what are considered to be the best modes for carrying out the application for those skilled in the art, it is not to be understood that the application is limited thereto, as the application is susceptible to various changes and modifications that will be readily apparent to those skilled in the art, all of which are intended to be encompassed by the appended claims.

Claims

1. A double-screw feeder, comprising a body (16), wherein a conveying chamber (1) is provided inside the body (16), and a pair of conveying screws (6) for conveying materials are arranged side by side inside the conveying chamber (1), characterized in that: The conveying auger (6) includes a rotatable main shaft (604), and the outer surface of the main shaft (604) is spirally provided with spiral blades (602) for propelling materials by its own rotation. A hollow cavity (603) is provided inside the main shaft (604), and a push rod (11) is provided on the machine body (16) that slides along the inside of the hollow cavity (603). An air delivery channel (12) is provided inside the push rod (11), and the front end of the air delivery channel (12) is connected to the output end of a high-pressure air pump (15). A [missing information - likely a device or component] is installed at the rear end of the air delivery channel (12). An exhaust valve (13) is provided on the push rod (11), and a main striking device (7) for striking the spindle (604) is provided. The main striking device (7) includes a guide tube (702) fixed and protruding on the surface of the push rod (11), and a punch (701) that uses gas to strike the inner wall of the hollow cavity (603) is slidably installed in the guide tube (702). The bottom of the punch (701) is sealed to the air supply channel (12) through a sealing membrane (703), and the bottom of the punch (701) is connected to the inner wall of the air supply channel (12) through a second return spring (704).

2. The double-screw feeder according to claim 1, characterized in that: A controller (21) is fixedly installed on the body (16), and the controller (21) is electrically connected to the high-pressure air pump (15) and the exhaust valve (13).

3. A double-screw feeder according to claim 2, characterized in that: The spiral blade (602) has a spiral groove (601) that communicates with the hollow cavity (603) inside. The spiral groove (601) is provided with a blade striking device (4) for striking the spiral blade (602). The blade striking device (4) includes a connecting frame (401) fixed to the bottom of the spiral groove (601). A hinge rod (403) is hinged on the connecting frame (401). A hammer (404) for striking the spiral blade (602) under the pressure of the guide tube (702) is installed at the end of the hinge rod (403). A first return spring (402) is installed between the hinge rod (403) and the connecting frame (401).

4. A twin-screw feeder according to claim 3, characterized in that: The cross-section of the guide tube (702) is circular or elliptical, and the edge of the hammer (404) is provided with an arc-shaped guide wing (405) for guiding the hammer (404) to slide away from the side of the guide tube (702) from the contact state with the guide tube (702).

5. A double-screw feeder according to claim 3, characterized in that: The main striking devices (7) are equidistantly arranged along the axial direction of the push rod (11), and the blade striking devices (4) are equidistantly arranged along the bottom of the spiral groove (601). The spacing between adjacent main striking devices (7) is the same as the pitch of the spiral blade (602), and the number of arrays of main striking devices (7) is the same as the number of turns of the spiral blade (602). At least two blade striking devices (4) are equidistantly arranged in the spiral groove (601) at positions corresponding to adjacent two main striking devices (7).

6. A twin-screw feeder according to claim 2, characterized in that: The machine body (16) has a feed hopper (14) fixedly installed at the feed inlet of the corresponding conveying chamber (1), and a feed valve (20) is installed on the feed hopper (14). The machine body (16) has a discharge pipe (18) fixedly installed at the discharge outlet of the corresponding conveying chamber (1), and a discharge valve (17) is fixedly installed on the discharge pipe (18). The machine body (16) is provided with an air guide device (5) inserted into the conveying chamber (1), and the high-pressure air pump (15) blows and cleans the material on the surface of the conveying auger (6) through the air guide device (5). The controller (21) is electrically connected to the feed valve (20) and the discharge valve (17) respectively.

7. A twin-screw feeder according to claim 6, characterized in that: The machine body (16) has an installation cavity (8) that communicates with the conveying cavity (1), and the air guiding device (5) includes a hollow tube (502) that is rotatably installed in the installation cavity (8). The surface of the hollow tube (502) is symmetrically provided with a pair of arc-shaped mating grooves (503) that match the shape of the inner wall of the conveying cavity (1). Each hollow tube (502) has one and only one arc-shaped mating groove (503) with an air delivery hole (501) that is equidistantly provided with a high-pressure air pump (15) and used to blow gas toward the surface of the conveying auger (6). The machine body (16) is fixedly installed with a second regulating motor (22) for driving the hollow tube (502) to rotate, and the controller (21) is electrically connected to the second regulating motor (22).

8. A twin-screw feeder according to claim 6, characterized in that: The machine body (16) is equipped with an exhaust device (3) above the corresponding discharge pipe (18). The exhaust device (3) includes an exhaust hood (303) fixedly connected to the machine body (16), and an exhaust chamber (302) communicating with the top of the conveying chamber (1) is opened in the exhaust hood (303). A filter screen (304) for filtering airflow is installed at the bottom of the exhaust chamber (302), and an exhaust pump (301) for extracting gas from the exhaust chamber (302) is fixedly installed at the top of the exhaust hood (303). The controller (21) is electrically connected to the exhaust pump (301).

9. A twin-screw feeder according to claim 8, characterized in that: The exhaust chamber (302) is provided with a cleaning device (2) for cleaning the filter screen (304), and the cleaning device (2) includes a rotating shaft (203) rotatably installed in the exhaust chamber (302), and a first adjusting motor (10) for driving the rotating shaft (203) to rotate is fixedly installed in the exhaust chamber (302). A sealing cover (204) for sealing the filter screen (304) is fixedly installed on the rotating shaft (203), and a cleaning motor (202) is fixedly installed on the rotating shaft (203). The output end of the cleaning motor (202) drives a cam (201) for striking the filter screen (304), and the controller (21) is electrically connected to the first adjusting motor (10) and the cleaning motor (202) respectively.

10. A twin-screw feeder according to claim 2, characterized in that: The machine body (16) is fixedly mounted with a drive motor (9) for driving the spindle (604) to rotate, and the machine body (16) is fixedly mounted with an adjusting push rod (19) for driving the push rod (11) to move. The controller (21) is electrically connected to the drive motor (9) and the adjusting push rod (19) respectively.

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