Vacuum feeding machine for powder particles

Abstract

According to the vacuum feeding machine for the powder particles, a stirring structure is installed in a material barrel, the bottom of the stirring structure extends to a discharging opening of the material barrel, and the top of the stirring structure extends to the outer side of a filter cylinder in a covering mode; when the stirring structure is driven by the motor to rotate, the bottom stirs materials to prevent blockage; the top is used for stirring the wrinkled filter cloth on the outer side of the filter drum to shake off adhered materials; according to the back-blowing air bag, wrinkled filter cloth outside the filter cartridge can be stirred, external dust can conveniently fall off, particles at filter holes can be loosened through stirring, and the cleaning effect of the back-blowing air bag during blowing cleaning of the filter cartridge is improved; and the stirring action can play a role in stirring the discharge port of the charging basket, so that the blockage is prevented, and the discharge of the materials is accelerated.

Description

Technical Field

[0001] The present invention relates to the field of feeders, and more specifically, to a vacuum feeder for powder particles. Background Art

[0002] In the production process of feed additives, it is often necessary to mix and process various powdered and granular raw materials, so it is natural that a commonly used vacuum feeder is indispensable for conveying the materials. For the existing vacuum feeders, there are currently two main ways to clean the filter components. One is to remove and clean the filter components by disassembly; the other is to clean the filter components by reverse blowing with a back-blowing air bag. The former requires shutdown for disassembly and cleaning / replacement, which is troublesome to operate. The latter, a single reverse blowing, mainly acts on dust particles stuck in the filter holes, and has a poor cleaning effect on materials adhered to the outside, and the gas diffusion is large. Insufficient blowing air volume at the bottom will also affect the cleaning effect, so it needs to be improved. Summary of the invention

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a vacuum loader for powder particles, which has a novel structure and can stir the pleated filter cloth outside the filter component to facilitate the falling of external dust. The stirring will also cause the particles at the filter holes to loosen, thereby improving the cleaning effect during the back-blowing air bag cleaning; and the stirring action will also have a stirring effect on the discharge port of the material barrel, thereby preventing blockage and accelerating the discharge of materials.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] The present invention provides a vacuum feeder for powder particles, comprising a material barrel, a filter cartridge, a negative pressure pump, and a back-blowing air bag. The negative pressure pump is used to form a negative pressure inside the material barrel, and to suck materials outwardly through a suction pipe of the material barrel. The materials entering the material barrel are precipitated through the filter cartridge, and fall and are collected at the bottom of the material barrel; the back-blowing air bag is used to back-blow and clean the filter cartridge; a stirring structure is installed inside the material barrel, the bottom of the stirring structure extends to the discharge port of the material barrel, and the top of the stirring structure extends to a cover arranged on the outside of the filter cartridge; when the stirring structure is driven to rotate by a motor, the bottom stirs the material to prevent clogging; the top stirs the pleated filter cloth on the outside of the filter cartridge to shake off adhered materials.

[0006] In a preferred technical solution of the present invention, a through hole is provided in the middle of the top surface of the barrel, a support cylinder is installed on the outside of the through hole, and the filter cylinder is installed inside the support cylinder, dividing the interior of the support cylinder into a first chamber and a second chamber, the second chamber is located below the first chamber, and the second chamber is connected to the interior of the barrel; a cover plate is fixedly installed on the outside of the top opening of the filter cylinder, and a first air pipe connected to the interior of the filter cylinder is provided on the cover plate; an air inlet of the negative pressure pump is connected to an exhaust pipe, and an air outlet of the back-blowing air bag is connected to an exhaust pipe, and the exhaust pipe and the exhaust pipe are connected to the first air pipe through a three-way pipe; an electromagnetic valve is installed on the exhaust pipe, and a pulse valve is installed on the exhaust pipe; the top of the stirring structure extends into the interior of the second chamber, and the cover is arranged on the outside of the filter cylinder; the motor is installed in the first chamber, and the output shaft of the motor is transmission-connected to the top of the stirring structure to drive the stirring structure to rotate.

[0007] In a preferred technical solution of the present invention, the stirring structure includes a frame, the outer side of the frame is a columnar contour structure, and the shape is adapted to the shape of the second chamber; a support ring is fixedly provided at the bottom of the perforated inner wall, and the inner diameter of the support ring is smaller than the outer diameter of the frame; the bottom of the frame is movably supported on the top surface of the support ring, and the frame rotates close to the inner wall of the second chamber; the filter cartridge is located inside the frame, and at least one scraper for stirring the pleated filter cloth is fixedly provided on the inner wall of the frame; the output shaft of the motor is transmission-connected to the frame; a rotating shaft is fixedly provided in the middle of the bottom surface of the frame, and the rotating shaft extends toward the bottom of the barrel, and a stirring blade is provided on the bottom side wall of the rotating shaft.

[0008] In a preferred technical solution of the present invention, the frame includes a first support ring and a second support ring, the first support ring is located above the second support ring, the first support ring and the second support ring are fixedly connected by a plurality of vertical rods, and the diameters of the first support ring and the second support ring are adapted to the inner diameter of the second chamber; the outer wall of the first support ring is provided with a guide groove in a closed loop around the axis, and the outer wall of the support tube is correspondingly provided with a plurality of threaded holes, guide bolts are installed at the threaded holes, and the ends of the guide bolts are provided with sliding surface columns for inserting into the guide grooves; a circle of teeth is provided on one side of the inner ring of the first support ring; the output shaft of the motor is transmission-connected with the reduction box, the output shaft of the reduction box extends into the second chamber, and a gear is fixedly installed at the end, and the gear is meshed with the teeth of the first support ring for transmission;

[0009] The scraper strip is fixedly arranged on the wall surface of the vertical rod close to the center of the frame body; a cross is fixedly arranged on the inner ring of the second supporting ring, and the rotating shaft is fixedly arranged on the bottom center of the cross.

[0010] In a preferred technical solution of the present invention, the stirring blade is triangular in shape, and the side of the stirring blade away from the rotating shaft is an arc-shaped structure, which is adapted to the shape of the bottom inner wall of the barrel, and the inclined lower end extends into the inner side of the discharge port; the number of stirring blades is 2, which are symmetrically arranged about the axis of the rotating shaft, and the two stirring blades are slidably matched with the bottom inner wall of the barrel, and the bottom of the rotating shaft provides rotational support.

[0011] In a preferred technical solution of the present invention, the filter cartridge includes a tray, a support ring is fixedly provided on the outer side of the top of the tray, and a cylindrical pleated filter cloth is fixedly provided on the outer side of the bottom end of the through hole of the tray; a step portion is provided on the inner wall of the middle part of the support tube, the support ring is tightly pressed against the top surface of the step portion and is fixedly connected by bolts, so that the interior of the support tube is divided into a first chamber and a second chamber; a cover plate is fixedly installed on the outer side of the top end of the through hole of the tray by bolts, and the top surface of the cover plate is fixedly installed on a support frame for installing a motor and a reduction box; a circular hole is provided on the tray for passing the output shaft of the reduction box.

[0012] In a preferred technical solution of the present invention, a plurality of scraping strips are fixedly provided on the inner wall of the frame, and the plurality of scraping strips are distributed in a linear array along the axial direction of the frame, the maximum spacing between the first and last scraping strips is greater than half the length of the filter cartridge, and the bottom surface of the lowest scraping strip is lower than the bottom surface of the pleated filter cloth.

[0013] The beneficial effects of the present invention are:

[0014] The present invention provides a vacuum feeder for powder particles, wherein a back-blowing air bag is used to back-blow and clean a filter cartridge; a stirring structure is installed inside the barrel, the bottom of the stirring structure extends to the discharge port of the barrel, and the top of the stirring structure extends to a cover arranged outside the filter cartridge; when the stirring structure is driven to rotate by a motor, the bottom of the stirring structure stirs the discharge port of the barrel to prevent blockage and accelerate the discharge of materials;

[0015] The top of the stirring structure stirs the pleated filter cloth on the outside of the filter cartridge to shake off the adhering material. The shaking will also loosen the particles at the filter holes, effectively improving the cleaning effect during the back-blowing air bag cleaning, maintaining smooth ventilation of the filter cartridge, and ensuring that sufficient negative pressure is formed inside the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a vacuum feeder for powder particles provided in a specific embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of a three-dimensional unfolded structure of a vacuum feeder for powder particles provided in a specific embodiment of the present invention;

[0018] Figure 3 is a cross-sectional view of a vacuum feeder for powder particles provided in a specific embodiment of the present invention;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the coordination state of the filter cartridge, the stirring structure, and the motor provided in a specific embodiment of the present invention;

[0020] Figure 5It is a three-dimensional structural schematic diagram of the unfolded state of the filter cartridge, the stirring structure, and the motor provided in a specific embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of the three-dimensional structure of a stirring structure provided in a specific embodiment of the present invention;

[0022] In the figure:

[0023] 100, barrel; 110, perforation; 200, filter cartridge; 210, pleated filter cloth; 220, tray; 230, support ring; 300, negative pressure pump; 310, air extraction pipe; 400, back-blowing air bag; 410, air outlet pipe;

[0024] 500, stirring structure; 510, frame; 511, first support ring; 512, second support ring; 513, vertical rod; 514, teeth; 515, cross; 520, scraper; 530, rotating shaft; 540, stirring blade;

[0025] 600, motor; 610, reduction box; 620, gear; 700, support tube; 710, first chamber; 720, second chamber; 730, step portion; 740, sealing plate; 800, cover plate; 810, first air pipe; 820, support frame. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0027] like Figures 1 to 3 As shown, a specific embodiment of the present invention discloses a vacuum feeder for powder particles, including a barrel 100, a filter cartridge 200, a negative pressure pump 300, and a back-blowing air bag 400. The negative pressure pump is used to form a negative pressure inside the barrel, and suck the material outward through the suction pipe of the barrel. The material entering the barrel is precipitated through the filter cartridge and falls and is collected at the bottom of the barrel; the back-blowing air bag is used to back-blow and clean the filter cartridge; a stirring structure 500 is installed inside the barrel 100, and the bottom of the stirring structure 500 extends to the discharge port of the barrel 100, and the top of the stirring structure 500 extends to the outside of the filter cartridge 200; when the stirring structure 500 is driven to rotate by the motor 600, the bottom stirs the material to prevent clogging; the top stirs the pleated filter cloth 210 on the outside of the filter cartridge 200 to shake off the adhered material.

[0028] In the above-mentioned vacuum feeder for powder particles, the bottom of the stirring structure extends to the discharge port of the barrel, and the top of the stirring structure extends to the cover arranged outside the filter cartridge; when the stirring structure is driven to rotate by the motor, the bottom of the stirring structure has a stirring effect on the discharge port of the barrel to prevent blockage and accelerate the discharge of materials;

[0029] The top of the stirring structure stirs the pleated filter cloth on the outside of the filter cartridge to shake off the adhering material. The shaking will also loosen the particles at the filter holes, effectively improving the cleaning effect during the back-blowing air bag cleaning, maintaining smooth ventilation of the filter cartridge, and ensuring that sufficient negative pressure is formed inside the barrel.

[0030] Furthermore, if Figures 2 to 5 As shown, a through hole 110 is provided in the middle of the top surface of the barrel 100, a support cylinder 700 is installed on the outside of the through hole 110, and a filter cartridge 200 is installed inside the support cylinder 700, dividing the interior of the support cylinder 700 into a first chamber 710 and a second chamber 720, wherein the second chamber 720 is located below the first chamber 710, and the second chamber 720 is communicated with the interior of the barrel 100; the filter cartridge is used as a separating component to distinguish the pre-filtration area and the post-filtration area, which is more convenient for the design and layout of various structural components;

[0031] A cover plate 800 is fixedly installed on the outer side of the top opening of the filter cartridge 200, and a first air pipe 810 connected to the inside of the filter cartridge 200 is provided on the cover plate 800; the air inlet of the negative pressure pump 300 is connected to an exhaust pipe 310, and the air outlet of the back-blowing air bag 400 is connected to an exhaust pipe 410, and the exhaust pipe and the exhaust pipe are connected to the first air pipe through a three-way pipe; an electromagnetic valve is installed on the exhaust pipe, and a pulse valve is installed on the exhaust pipe; the negative pressure pump evacuates air from the inside of the filter cartridge to form a negative pressure condition inside the entire material barrel, and then extracts external powder particles through a suction pipe connected to the outside of the material barrel; when the filter cartridge needs to be back-blown and cleaned, it is necessary to close the electromagnetic valve, inflate and pressurize the back-blowing air bag, and after reaching the preset pressure value, the pulse valve is opened to quickly blow high-pressure gas into the inside of the filter cartridge, thereby achieving the effect of blowing and cleaning; it should be noted that the back-blowing air bag is a well-known instrument structure, which can be directly purchased and used on the market, and the details will not be repeated;

[0032] The top of the stirring structure 500 extends into the interior of the second chamber 720, and the cover is arranged on the outside of the filter cartridge 200; the motor 600 is installed in the first chamber 710, and the output shaft of the motor is connected to the top of the stirring structure to drive the stirring structure to rotate; the motor is a driving component, and it is located in the first chamber in the post-filtration area, which effectively prevents dust particles from affecting the use of the motor.

[0033] Furthermore, if Figures 3 to 6As shown, the stirring structure 500 includes a frame 510, the outer side of the frame 510 is a columnar profile structure, and the shape is adapted to the shape of the second chamber 720; a support ring 120 is fixedly provided at the bottom of the inner wall of the perforation 110, and the inner diameter of the support ring is smaller than the outer diameter of the frame; the bottom of the frame 510 is movably supported on the top surface of the support ring 120, and the frame 510 rotates close to the inner wall of the second chamber 720; the frame serves as the main structure of the top area of ​​the stirring structure, and the bottom is supported by the support ring, and the side wall slides close to the inner wall of the second chamber, effectively ensuring the overall rotation support foundation; the output shaft of the motor is connected to the frame in a transmission manner, which can shorten the transmission range and facilitate the design and layout of each structural component. The overall structure is more compact; the filter cartridge 200 is located inside the frame 510, and at least one scraper 520 for stirring the pleated filter cloth 210 is fixedly provided on the inner wall of the frame 510. The filter cartridge will not affect the rotation of the frame, and on this basis, the pleated filter cloth can be pushed, scraped and stirred by the scraper to effectively shake off the material adhering to the outside; under this structural design and layout, the various structural components are also placed in a relatively compact position; a rotating shaft 530 is fixedly provided in the middle of the bottom surface of the frame 510, and the rotating shaft 530 extends toward the bottom of the barrel 100. A stirring blade 540 is provided on the bottom side wall of the rotating shaft 530 to effectively stir the material gathered at the bottom to prevent clogging.

[0034] Furthermore, if Figure 2 , Figure 6 As shown, the frame 510 includes a first support ring 511 and a second support ring 512, the first support ring is located above the second support ring, the first support ring 511 and the second support ring 512 are fixedly connected by a plurality of vertical rods 513, and the diameters of the first support ring 511 and the second support ring 512 are adapted to the inner diameter of the second chamber 720; the structure of the frame is further limited, on the one hand, to ensure that it has sufficient structural strength, and on the other hand, to provide sufficient vacant parts, which does not affect normal air extraction and does not affect the falling of materials;

[0035] The outer wall of the first support ring is provided with a guide groove in a closed loop around the axis, and the outer wall of the support tube is correspondingly provided with a plurality of threaded holes, guide bolts are installed at the threaded holes, and the ends of the guide bolts are provided with sliding surface columns for inserting into the guide grooves. This structural design can further limit the cooperation between the frame and the support tube. The bottom of the frame rotates against the support ring, and the top is limited by a plurality of guide bolts, so that the frame is maintained to rotate in the required area, ensuring the required transmission cooperation.

[0036] A circle of teeth 514 is provided on one side of the inner ring of the first support ring 511; the output shaft of the motor 600 is transmission-connected with the reduction box 610, the output shaft of the reduction box 610 extends into the second chamber 720, and a gear 620 is fixedly installed on the end, the gear 620 meshes with the teeth 514 of the first support ring 511 for transmission, and the scraper strip 520 is fixedly arranged on the wall surface of the vertical rod 513 close to the center of the frame 510; the above-mentioned transmission coordination is designed based on the structure of the frame, and the overall coordination is simple, ensuring that it can rotate around the set position, thereby effectively scraping and pushing the pleated filter cloth; a cross 515 is fixedly mounted on the inner ring of the second support ring 512, and the rotating shaft 520 is fixedly arranged at the bottom center of the cross 515; reinforcing ribs are provided at the connection between the cross and the rotating shaft, which are used to further strengthen the connection between the rotating shaft and the frame and enhance its overall structural strength.

[0037] Furthermore, the stirring blade 540 has a triangular structure, and the side of the stirring blade 540 away from the rotating shaft 530 is an arc-shaped structure, and is adapted to the shape of the bottom inner wall of the barrel 100, and the inclined lower end extends into the inner side of the discharge port; the number of stirring blades 540 is 2, and they are symmetrically arranged about the axis of the rotating shaft 530, and the two stirring blades are slidably matched with the bottom inner wall of the barrel, and the bottom of the rotating shaft provides rotational support; under the overall coordination, the top and bottom of the stirring structure are limited, so that it can rotate and swing smoothly, ensuring that the stirring blade completes the stirring and blocking prevention, and the scraper completes the stirring and cleaning actions.

[0038] Furthermore, if Figures 3 to 5 As shown, the filter cartridge 200 includes a tray 220, a support ring 230 is fixedly provided on the outer side of the top of the tray 220, and a cylindrical pleated filter cloth 210 is fixedly provided on the outer side of the bottom end of the through hole of the tray 220; a step portion 730 is provided on the inner wall of the middle part of the support cylinder 700, and the support ring 230 is pressed tightly against the top surface of the step portion 730 and is fixedly connected by bolts, so that the interior of the support cylinder is divided into a first chamber and a second chamber; the cover plate 800 is fixedly installed on the outer side of the top end of the through hole 240 of the tray 220 by bolts, and the top surface of the cover plate 800 is fixedly provided on the support frame 820 for installing the motor and the reduction box; a circular hole for passing the output shaft of the reduction box is provided on the tray; the structure of the filter cartridge is further defined so that it can better cooperate with the support cylinder, and also provides a mounting position for the motor and the reduction box, so as to facilitate the assembly of various structural components; it should be noted that the cylindrical pleated filter cloth is a common cylindrical filter element structure at present, which is a well-known structure, and the specific production method is not repeated;

[0039] Furthermore, the top of the support tube is open to facilitate the disassembly and layout of the internal structure, and to facilitate assembly and maintenance; a sealing plate is installed on the outside of the open mouth to shield and protect the internal structural equipment and prevent dust from the external working environment from entering.

[0040] Furthermore, if Figure 6 As shown, a plurality of scraping strips 520 are fixedly provided on the inner wall of the frame 510, and the plurality of scraping strips 520 are distributed in a linear array along the axial direction of the frame 510, and the maximum spacing between the first and last scraping strips 520 is greater than half the length of the filter cartridge 200, and the bottom surface of the lowest scraping strip 520 is lower than the bottom surface of the pleated filter cloth 210; the range of pushing and scraping is effectively expanded, the pleated filter cloth is effectively stirred and cleaned, the cleaning quality is improved, and the particles at the filter holes are fully loosened for subsequent cleaning of the backblowing air bag.

[0041] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A vacuum feeder for powder particles, comprising a barrel, a filter cartridge, a negative pressure pump, and a back-blowing air bag. The negative pressure pump is used to form a negative pressure inside the barrel, and the material is sucked out through the suction pipe of the barrel. The material entering the barrel is precipitated through the filter cartridge and falls and is collected at the bottom of the barrel; the back-blowing air bag is used to back-blow and clean the filter cartridge; it is characterized by: A stirring structure is installed inside the barrel, the bottom of which extends to the discharge port of the barrel, and the top of which extends to the cover arranged on the outside of the filter cartridge. When the stirring structure is driven to rotate by the motor, the bottom stirs the material to prevent clogging; the top stirs the pleated filter cloth on the outside of the filter cartridge to shake off the adhering material.

2. A vacuum feeder for powder particles according to claim 1, characterized in that: A perforation is provided in the middle of the top surface of the barrel, a support cylinder is installed outside the perforation, and the filter cylinder is installed inside the support cylinder, dividing the interior of the support cylinder into a first chamber and a second chamber, the second chamber is located below the first chamber, and the second chamber is connected to the interior of the barrel; A cover plate is fixedly installed on the outer side of the top opening of the filter cartridge, and a first air pipe connected to the inside of the filter cartridge is arranged on the cover plate; an air inlet of the negative pressure pump is connected to an air extraction pipe, and an air outlet of the back-blowing air bag is connected to an air outlet pipe, and the air extraction pipe and the air outlet pipe are connected to the first air pipe through a three-way pipe; an electromagnetic valve is installed on the air extraction pipe, and a pulse valve is installed on the air outlet pipe; The top of the stirring structure extends into the second chamber, and the cover is arranged on the outside of the filter cartridge; the motor is installed in the first chamber, and the output shaft of the motor is transmission-connected with the top of the stirring structure to drive the stirring structure to rotate.

3. A vacuum feeder for powder particles according to claim 2, characterized in that: The stirring structure comprises a frame, the outer side of the frame is a columnar profile structure, and the shape is adapted to the shape of the second chamber; a support ring is fixedly provided at the bottom of the perforated inner wall, and the inner diameter of the support ring is smaller than the outer diameter of the frame; the bottom of the frame is movably supported on the top surface of the support ring, and the frame rotates close to the inner wall of the second chamber; the filter cartridge is located inside the frame, and at least one scraper for stirring the pleated filter cloth is fixedly provided on the inner wall of the frame; the output shaft of the motor is drivingly connected to the frame; A rotating shaft is fixedly arranged at the middle part of the bottom surface of the frame body, the rotating shaft extends toward the bottom of the barrel, and a stirring blade is arranged on the side wall of the bottom end of the rotating shaft.

4. A vacuum feeder for powder particles according to claim 3, characterized in that: The frame includes a first support ring and a second support ring. The first support ring is located above the second support ring. The first support ring and the second support ring are fixedly connected by a plurality of vertical rods. The diameters of the first support ring and the second support ring are adapted to the inner diameter of the second chamber. The outer wall of the first support ring is provided with a guide groove in a closed loop around the axis, and the outer wall of the support tube is correspondingly provided with a plurality of threaded holes, guide bolts are installed at the threaded holes, and the ends of the guide bolts are provided with sliding surface columns for inserting into the guide grooves; A circle of teeth is provided on one side of the inner ring of the first support ring; the output shaft of the motor is connected to the reduction box in transmission, the output shaft of the reduction box extends into the second chamber, and a gear is fixedly installed on the end, and the gear meshes with the teeth of the first support ring in transmission; The scraper strip is fixed on the wall surface of the vertical rod close to the center of the frame; A cross is fixedly mounted on the inner ring of the second supporting ring, and a rotating shaft is fixedly arranged at the center of the bottom surface of the cross.

5. The vacuum feeder for powder particles according to claim 3, characterized in that: The stirring blade is triangular in shape, and the side of the stirring blade away from the rotating shaft is an arc-shaped structure, which is adapted to the shape of the bottom inner wall of the barrel, and the lower inclined end extends into the inner side of the discharge port; The number of stirring blades is 2, which are symmetrically arranged about the axis of the rotating shaft. The two stirring blades are slidably matched with the inner wall of the bottom of the barrel, and the bottom of the rotating shaft provides rotation support.

6. A vacuum feeder for powder particles according to claim 2, characterized in that: The filter cartridge comprises a tray, a support ring is fixedly arranged on the outer side of the top of the tray, and a columnar pleated filter cloth is fixedly arranged on the outer side of the bottom end of the through hole of the tray; A step portion is provided on the inner wall of the middle portion of the support tube, and the support ring is pressed tightly against the top surface of the step portion and fixedly connected by bolts, so that the interior of the support tube is divided into a first chamber and a second chamber; The cover plate is fixedly mounted on the outer side of the top end of the through hole of the tray by means of bolts, and the top surface of the cover plate is fixedly mounted on a support frame for mounting the motor and the reduction box; The tray is provided with a round hole for passing the output shaft of the reduction box.

7. A vacuum feeder for powder particles according to claim 3, characterized in that: A plurality of scraping strips are fixedly arranged on the inner wall of the frame, and the plurality of scraping strips are linearly arrayed along the axis direction of the frame, the maximum spacing between the first and last scraping strips is greater than half the length of the filter cartridge, and the bottom surface of the lowest scraping strip is lower than the bottom surface of the pleated filter cloth.

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