Flammable magnetic dust collector

The magnetic dust is adsorbed by magnetizing the metal sleeve with a magnet rod, and a gas circulation system is formed by combining a cyclone dust collector and a fan. This solves the problems of low equipment maintenance efficiency and poor ventilation caused by powder accumulation, and achieves efficient dust removal and safe anti-oxidation.

CN223417957UActive Publication Date: 2025-10-10BEIJING JINGCI ELECTRIC TECH CO LTD
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Patent Information

Application Number
CN202422623201.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-10-10
Estimated Expiration
2034-10-29

AI Technical Summary

Technical Problem

In the prior art, magnetic dust generated during the powder metallurgy manufacturing process accumulates in the equipment, resulting in low equipment maintenance efficiency, and the flame retardant filter is easily clogged, reducing the dust removal efficiency.

Method used

A magnet rod is used to magnetize the metal sleeve to absorb magnetic dust, avoiding the use of filters. A cyclone dust collector and a fan are combined to form a gas circulation system, and nitrogen protection is used to prevent oxidation.

Benefits of technology

It achieves efficient adsorption of magnetic dust, avoids clogging of ventilation holes, improves dust removal efficiency, and prevents oxidation through nitrogen circulation to ensure safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an inflammable magnetic dust collector, which comprises a cyclone dust collector, a first collecting tank, a second collecting tank, a dust collecting tank, a dust collecting tank, a dust collecting tank and a dust collecting tank, and is characterized in that the top of the cyclone dust collector is communicated with a production area; the top of the adsorption tank is communicated with the top of the cyclone dust collector, a second collection tank communicated with the adsorption tank is detachably arranged at the bottom of the adsorption tank, a plurality of insertion holes are formed in the top wall of the adsorption tank, and metal sleeves extending into the adsorption tank are arranged at the insertion holes; a magnet rod which is inserted from the top of the metal sleeve and is coaxial with the metal sleeve is movably inserted in the metal sleeve, and the bottom of the metal sleeve is sealed; the inlet end of the fan is communicated with the top of the adsorption tank, and the outlet end of the fan is communicated with the production area. According to the utility model, the metal sleeve is magnetized by using the magnet rod, magnetic fine powder is adsorbed, a filter screen is not used, the problem of poor ventilation caused by blockage of the ventilation hole is avoided, and the dust removal efficiency is high.
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Description

Technical Field

[0001] The utility model relates to the technical field of dust removal equipment, in particular to a flammable magnetic dust collector. Background Art

[0002] Neodymium iron boron magnetic materials are mainly manufactured by powder metallurgy. During the production process, powder will be scattered in the production equipment and the surrounding environment. Long-term production will cause powder accumulation in the corners of the equipment. When maintaining the equipment, the powder must be cleaned first, which reduces the efficiency of equipment maintenance. The Chinese utility model patent with announcement number CN205832867U discloses a permanent magnet flammable powder industrial vacuum cleaner, which first collects most of the dust through the dust collecting chamber in the first chamber, and then filters and intercepts the remaining dust through the flame retardant filter in the second chamber to achieve the dust removal effect. However, the flame retardant filter has an adsorption effect on dust. After a large amount of powder is adsorbed, the flame retardant filter will have poor air permeability, reduced air flow, and reduced dust removal efficiency. Utility Model Content

[0003] The utility model provides a flammable magnetic dust collector, which does not use a filter screen, but adsorbs and removes magnetic fine powder through a metal sleeve magnetized by a magnet bar, effectively avoiding the problem of poor ventilation caused by the blockage of ventilation holes.

[0004] In order to achieve these purposes and other advantages according to the present invention, there is provided a flammable magnetic dust collector, comprising:

[0005] A cyclone dust collector, the top of which is connected to the production area and the bottom of which is detachably provided with a first collecting tank connected thereto;

[0006] An adsorption tank, the top of which is connected to the top of the cyclone dust collector and the bottom of which is detachably provided with a second collection tank connected thereto, a plurality of sockets being provided on the top wall of the adsorption tank, a metal sleeve extending into the adsorption tank being provided at the sockets, a magnet rod being inserted from the top and coaxial therewith and movably inserted into the metal sleeve, and the bottom of the metal sleeve being sealed;

[0007] The fan has an inlet end connected to the top of the adsorption tank and an outlet end connected to the production area.

[0008] Preferably, the flammable magnetic dust collector further comprises:

[0009] The support frame has a telescopic cylinder on its top, a lifting plate on the telescopic end of the telescopic cylinder, and the magnet rod is arranged under the lifting plate.

[0010] Preferably, in the flammable magnetic dust collector, a plurality of guide holes are provided on the lifting plate, and a plurality of guide rods are provided on the support frame, and the guide rods are movably inserted into their corresponding guide holes.

[0011] Preferably, in the flammable magnetic dust collector, the cyclone dust collector, the first collection tank, the adsorption tank, the second collection tank, and the fan are all arranged on the support frame, and a plurality of moving wheels are provided at the bottom of the support frame.

[0012] Preferably, in the flammable magnetic dust collector, the telescopic cylinder and the lifting plate are both located directly above the adsorption tank, and the guide rods are all arranged around the adsorption tank.

[0013] Preferably, in the flammable magnetic dust collector, a controller is provided on the support frame, and the controller is communicatively connected with the telescopic cylinder and the fan for controlling the operation of the telescopic cylinder and the fan.

[0014] Preferably, in the flammable magnetic dust collector, the top of the cyclone dust collector is connected to the outlet end of the air inlet pipe, the outlet end of the fan is connected to the inlet end of the air outlet pipe, and the inlet end of the air inlet pipe and the outlet end of the air outlet pipe are connected through a connecting piece and are both connected to the production area.

[0015] Preferably, in the flammable magnetic dust collector, the connecting piece includes:

[0016] a first connecting pipe, one end of which is connected to the inlet end of the air inlet pipe and the other end of which is connected to the production area;

[0017] A connecting tube is sleeved on the outside of the first connecting tube, and one end of the connecting tube close to the air inlet pipe is sealedly connected to the first connecting tube, and the other end away from the air inlet pipe is connected to the production area. The side wall of the connecting tube is connected to the outlet end of the air outlet pipe through the second connecting tube.

[0018] Preferably, in the flammable magnetic dust collector, the other end of the first connecting pipe protrudes from the connecting cylinder.

[0019] Preferably, in the flammable magnetic dust collector, the cyclone dust collector includes a cylindrical body and a cone arranged and connected to each other in an upper and lower manner, and a first collecting tank connected to the bottom of the cone is detachably provided, and the top of the cylindrical body is connected to the outlet end of the air inlet pipe and is connected to the adsorption tank through a first air supply pipe; the adsorption tank is connected to the inlet end of the fan through a second air supply pipe.

[0020] The utility model has at least the following beneficial effects:

[0021] 1. The utility model uses a magnet rod to magnetize the metal sleeve to adsorb the magnetic fine powder. It does not use a filter screen, will not block the ventilation holes and cause poor ventilation problems, and has high dust removal efficiency;

[0022] 2. When the utility model is used, after the magnet rod is separated from the metal sleeve, the metal sleeve loses its ability to absorb the magnetic powder, and the magnetic powder can be separated from the metal sleeve by its own gravity and enter the second collection tank, making the collection of the magnetic powder more convenient and efficient;

[0023] 3. The utility model contains nitrogen circulating gas inside, which can effectively isolate oxygen and prevent internal ignition.

[0024] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a flammable magnetic dust collector in one of the technical solutions of the present utility model;

[0026] Among them, 1-first connecting pipe, 2-connecting cylinder, 3-second connecting pipe, 4-air inlet pipe, 5-cyclone dust collector, 6-first air supply pipe, 7-telescopic cylinder, 8-lifting plate, 9-magnetic rod, 10-controller, 11-adsorption tank, 12-guide rod, 13-second collection tank, 14-support frame, 15-second air supply pipe, 16-fan, 17-moving wheel, 18-first collection tank, 19-cone, 20-cylinder, 21-outlet pipe. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0029] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense. For example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directions or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0030] like Figure 1 As shown, the utility model provides a flammable magnetic dust collector, comprising:

[0031] The cyclone dust collector 5 has a top portion connected to the production area and a first collecting tank 18 connected thereto which is detachably provided at the bottom;

[0032] An adsorption tank 11, the top of which is connected to the top of the cyclone dust collector 5, and a second collection tank 13 connected thereto is detachably provided at the bottom. A plurality of sockets are provided on the top wall of the adsorption tank 11, and a metal sleeve extending into the adsorption tank 11 is provided at the socket. A magnet rod 9 is movably inserted into the metal sleeve and is coaxial with the magnet rod 9 inserted from the top thereof. The bottom of the metal sleeve is sealed.

[0033] The fan 16 has an inlet end connected to the top of the adsorption tank 11 and an outlet end connected to the production area.

[0034] The combustible magnetic dust cleaner provided by the technical scheme mainly comprises a cyclone dust collector 5, an adsorption tank 11 and a fan 16, wherein the top of the cyclone dust collector 5 is communicated with a production area and the top of the adsorption tank 11, the top of the adsorption tank 11 is further communicated with the inlet end of the fan 16, and the outlet end of the fan 16 is communicated with the production area, so that the cyclone dust collector 5, the adsorption tank 11, the fan 16 and the production area form a gas circulation system, the fan 16 can be a negative pressure snail fan 16, the production area is the inside of a production workshop or production equipment, and the production of magnetic powder is protected by filling nitrogen to prevent the magnetic powder from exploding due to oxygen, and a first collecting tank 18 is detachably arranged at the bottom of the cyclone dust collector 5 and communicated with the cyclone dust collector 5, used for containing the agglomerated dust and large-particle dust separated from the cyclone dust collector 5, a plurality of insertion holes are arranged on the top wall of the adsorption tank 11, and metal sleeves such as stainless steel pipes, iron pipes and alloy pipes are inserted into the insertion holes and extend into the adsorption tank 11, a magnet rod 9 is movably inserted into the metal sleeves and can be inserted into and pulled out from the top of the metal sleeves, the magnet rod 9 is coaxial with the metal sleeves and slightly smaller in diameter than the metal sleeves, so that the metal sleeves can be magnetized when the magnet rod 9 is inserted into the metal sleeves, and the magnetic fine powder in the adsorption tank 11 is adsorbed and separated from the gas, the wall of the metal sleeve is sealingly connected with the top wall of the adsorption tank 11, and the bottom of the metal sleeve is sealed to prevent the adsorption tank 11 from leaking, and a second collecting tank 13 is detachably arranged at the bottom of the adsorption tank 11 and communicated with the adsorption tank 11, used for containing the magnetic fine dust separated from the adsorption tank 11, and the first collecting tank 18 and the second collecting tank 13 can be easily detached to further collect and operate the collected particles and dust.

[0035] The method for using the combustible magnetic dust cleaner provided by the technical scheme is as follows: an operator communicates the top of the cyclone dust collector 5 with the production area, opens the fan 16, and the magnetic dust and the protective gas nitrogen in the production area are sucked into the cyclone dust collector 5 under the action of negative pressure and preliminarily separated and deposited in the cyclone dust collector 5, the agglomerated and large-particle dust automatically falls into the first collecting tank 18, the magnetic fine powder enters the adsorption tank 11 from the top of the cyclone dust collector 5, meanwhile, the magnet rod 9 is inserted into the metal sleeve, the metal sleeve is magnetized to adsorb and separate the magnetic fine powder from the nitrogen, the nitrogen enters the production area from the top of the adsorption tank 11 through the fan 16 and is recycled, the nitrogen content in the production area is ensured to be within a safe range, after the dust collection is completed, the fan 16 is closed, the magnet rod 9 moves upward, the metal sleeve loses the magnetic attraction ability, the magnetic fine powder falls into the second collecting tank 13 after being separated from the metal sleeve, and the first collecting tank 18 and the second collecting tank 13 are detached to perform passivation operation, collection and reuse on the collected magnetic powder.

[0036] The present invention at least has the following beneficial effects: the top of the cyclone dust collector 5 is connected with the production area and the top of the adsorption tank 11, the top of the adsorption tank 11 is connected with the inlet end of the fan 16, and the outlet end of the fan 16 is connected with the production area. A plurality of sockets are provided on the top wall of the adsorption tank 11, and a metal sleeve extending into the adsorption tank 11 is provided at the socket. A magnet rod 9 is movably inserted into the metal sleeve and is plugged in and out of the top of the metal sleeve and is coaxial with the magnet rod 9. The bottom of the metal sleeve is sealed. The bottom of the cyclone dust collector 5 is detachably provided with a first collecting tank 18 connected thereto, and the bottom of the adsorption tank 11 is detachably provided with a second collecting tank 13 connected thereto. When in use, under the operation of the fan 16, the magnetic dust and protective gas nitrogen in the production area are sucked into the cyclone dust collector 5 under the action of negative pressure, and are preliminarily separated and precipitated after passing through the cyclone dust collector 5. The agglomerated and large-particle dust automatically falls into the first collecting tank 18, and the magnetic fine powder is removed from the cyclone dust collector. 5 enters the adsorption tank 11 at the top. At the same time, the magnet rod 9 is inserted into the metal sleeve. After the metal sleeve is magnetized, it adsorbs the magnetic fine powder and separates it from the nitrogen. The nitrogen enters the production area through the fan 16 from the top of the adsorption tank 11 for recycling. After the dust collection is completed, the fan 16 is turned off, the magnet rod 9 moves up, and the magnetic fine powder is separated from the metal sleeve and falls into the second collection tank 13. In this technical solution, the magnet rod 9 is used to magnetize the metal sleeve to adsorb the magnetic fine powder. No filter is used, and the ventilation holes will not be blocked, thereby causing poor ventilation. The dust removal efficiency is high. When the magnet rod 9 is separated from the metal sleeve, the metal sleeve loses its adsorption capacity for the magnetic fine powder. The magnetic fine powder can be separated from the metal sleeve by its own gravity and enter the second collection tank 13, making the collection of the magnetic fine powder more convenient and efficient. The first collection tank 18 and the second collection tank 13 can be disassembled to facilitate the further collection, operation and reuse of the particles and dust collected therein.

[0037] In another technical solution, Figure 1 As shown, the flammable magnetic dust collector further includes:

[0038] The support frame 14 has a telescopic cylinder 7 on its top. The telescopic end of the telescopic cylinder 7 is provided with a lifting plate 8, and the magnet rod 9 is provided below the lifting plate 8. The support frame 14 is used to support the telescopic cylinder 7, which drives the lifting plate 8 to move up and down. The lifting plate 8 can simultaneously drive multiple magnet rods 9 to move up and down, which is labor-saving and efficient.

[0039] In another technical solution, Figure 1 As shown, in the flammable magnetic dust collector, the lifting plate 8 is provided with a plurality of guide holes, and the support frame 14 is provided with a plurality of guide rods 12, each of which is movably inserted into its corresponding guide holes. The guide holes and guide rods 12 cooperate with the lifting plate 8 to guide the lifting and lowering movement, preventing the lifting plate 8 and the magnet plate from tilting during the lifting and lowering process.

[0040] In another technical solution, as shown in Figure 1 The cyclone dust collector 5, the first collecting tank 18, the adsorption tank 11, the second collecting tank 13 and the fan 16 are arranged on the support frame 14, and a plurality of moving wheels 17 are arranged at the bottom of the support frame 14. The moving wheels 17 facilitate the movement of the entire dust collector.

[0041] In another technical solution, as shown in Figure 1 The telescopic air cylinder 7 and the lifting plate 8 are located directly above the adsorption tank 11, and each guide rod 12 is arranged around the adsorption tank 11. The telescopic air cylinder 7 and the lifting plate 8 save the occupied area of the dust collector and make the force on the lifting plate 8 more uniform.

[0042] In another technical solution, as shown in Figure 1 The support frame 14 is provided with a controller 10, and the controller is in communication connection with the telescopic air cylinder 7 and the fan 16, and is used for controlling the operation of the telescopic air cylinder 7 and the fan 16. The dust collector operates more efficiently.

[0043] In another technical solution, the dust collector for flammable magnetic dust further comprises an oxygen control instrument, a probe of the oxygen control instrument is respectively inserted into the adsorption tank and the production area, and the oxygen control instrument is in communication connection with the controller. The oxygen control instrument can be a pointer display oxygen control instrument, the controller controls the operation of the oxygen control instrument, the oxygen control instrument monitors the oxygen content in the gas circulation system, so that the oxygen content is within a safe range, and explosion is prevented.

[0044] In another technical solution, as shown in Figure 1 The top of the cyclone dust collector 5 is connected with the outlet end of the air inlet pipe 4, the outlet end of the fan 16 is connected with the inlet end of the air outlet pipe 21, the inlet end of the air inlet pipe 4 and the outlet end of the air outlet pipe 21 are connected through a connecting piece and are both in communication with the production area. The air inlet pipe 4 and the air outlet pipe 21 are moved, disassembled and assembled at the same time through the connecting piece, and the operation efficiency is higher.

[0045] In another technical solution, as shown in Figure 1 The connecting piece comprises:

[0046] A first connecting pipe 1, one end of which is in communication with the inlet end of the air inlet pipe 4 and the other end of which is in communication with the production area;

[0047] The connecting tube 2 is sleeved on the outside of the first connecting tube 1, and its end close to the air inlet pipe 4 is sealed and connected to the first connecting tube 1, and its end away from the air inlet pipe 4 is connected to the production area. The side wall of the connecting tube 2 is connected to the outlet end of the air outlet pipe 21 through the second connecting tube 3. The first connecting tube 1, the connecting tube 2, and the second connecting tube 3 are integrally formed; the other end of the first connecting tube 1 is the dust inlet, and the dust in the production area enters this inlet under the action of negative pressure, and then enters the cyclone dust collector 5 through the first connecting tube 1 and the air inlet pipe 4; the end of the connecting tube 2 away from the air inlet pipe 4 is the outlet for the protective gas nitrogen. After purification, the nitrogen passes through the outlet pipe 21, the second connecting tube 3, and the connecting tube 2, and is discharged from the end of the connecting tube 2 away from the air inlet pipe 4 to the production area for reuse; this structure surrounds the nitrogen outlet at the dust inlet end to further prevent oxygen from mixing into the inlet end, thereby improving equipment safety.

[0048] In another technical solution, Figure 1 As shown, in the flammable magnetic dust collector, the other end of the first connecting pipe 1 protrudes from the connecting barrel 2. This prevents the protective gas nitrogen discharged from the connecting barrel 2 to the production area from being directly sucked into the first connecting pipe 1 through the inlet at the other end of the first connecting pipe 1, thereby affecting the recycling efficiency of the protective gas nitrogen.

[0049] In another technical solution, Figure 1 As shown, in the flammable magnetic dust collector, the cyclone dust collector 5 includes a cylindrical body 20 and a cone 19 arranged in a vertical arrangement and connected thereto. The bottom of the cone 19 is detachably provided with a first collection tank 18 connected thereto. The top of the cylindrical body 20 is connected to the outlet end of the air inlet pipe 4 and is connected to the adsorption tank 11 via the first air supply pipe 6. The adsorption tank 11 is connected to the inlet end of the fan 16 via the second air supply pipe 15. The small-diameter end at the bottom of the cone 19 is connected to the first collection tank 18, which can reduce the wind force there and further prevent the material in the first collection tank 18 from being sucked back into the cone 19. The adsorption tank 11 is connected to the cylindrical body 20 and the fan 16 via the first air supply pipe 6 and the second air supply pipe 15, respectively, which facilitates the flexible layout of the cyclone dust collector 5, adsorption tank 11, and fan 16.

[0050] The number of devices and processing scales described herein are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

[0051] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A flammable magnetic dust collector, characterized in that: include: A cyclone dust collector, the top of which is connected to the production area and the bottom of which is detachably provided with a first collecting tank connected thereto; An adsorption tank, the top of which is connected to the top of the cyclone dust collector and the bottom of which is detachably provided with a second collection tank connected thereto, a plurality of sockets being provided on the top wall of the adsorption tank, a metal sleeve extending into the adsorption tank being provided at the sockets, a magnet rod being inserted from the top and coaxial therewith and movably inserted into the metal sleeve, and the bottom of the metal sleeve being sealed; The fan has an inlet end connected to the top of the adsorption tank and an outlet end connected to the production area.

2. The flammable magnetic dust collector according to claim 1, characterized in that: Also includes: The support frame has a telescopic cylinder on its top, a lifting plate on the telescopic end of the telescopic cylinder, and the magnet rod is arranged under the lifting plate.

3. The flammable magnetic dust collector according to claim 2, characterized in that: The lifting plate is provided with a plurality of guide holes, and the support frame is provided with a plurality of guide rods, and the guide rods are movably inserted into the corresponding guide holes.

4. The flammable magnetic dust collector according to claim 2 or 3, characterized in that: The cyclone dust collector, the first collecting tank, the adsorption tank, the second collecting tank, and the fan are all arranged on the supporting frame, and a plurality of moving wheels are arranged at the bottom of the supporting frame.

5. The flammable magnetic dust collector according to claim 3, characterized in that: The telescopic cylinder and the lifting plate are both located directly above the adsorption tank, and the guide rods are all distributed around the adsorption tank.

6. The flammable magnetic dust collector according to claim 5, characterized in that: The support frame is provided with a controller, which is communicatively connected with the telescopic cylinder and the fan and is used for controlling the operation of the telescopic cylinder and the fan.

7. The flammable magnetic dust collector according to claim 1, characterized in that: The top of the cyclone dust collector is connected to the outlet end of the air inlet pipe, the outlet end of the fan is connected to the inlet end of the air outlet pipe, the inlet end of the air inlet pipe and the outlet end of the air outlet pipe are connected through a connector and are both connected to the production area.

8. The flammable magnetic dust collector according to claim 7, characterized in that: The connecting piece includes: a first connecting pipe, one end of which is connected to the inlet end of the air inlet pipe and the other end of which is connected to the production area; A connecting tube is sleeved on the outside of the first connecting tube, and one end of the connecting tube close to the air inlet pipe is sealedly connected to the first connecting tube, and the other end away from the air inlet pipe is connected to the production area. The side wall of the connecting tube is connected to the outlet end of the air outlet pipe through the second connecting tube.

9. The flammable magnetic dust collector according to claim 8, characterized in that: The other end of the first connecting tube protrudes from the connecting cylinder.

10. The flammable magnetic dust collector according to claim 9, characterized in that: The cyclone dust collector includes a cylindrical body and a cone arranged in upper and lower communication with each other. The bottom of the cone is detachably provided with a first collecting tank connected thereto. The top of the cylindrical body is connected to the outlet end of the air inlet pipe and is connected to the adsorption tank through a first air supply pipe; the adsorption tank is connected to the inlet end of the fan through a second air supply pipe.

Citation Information

Patent Citations

  • Permanent magnet easily fires powder industry dust catcher

    CN205832867U