An inert gas protection type screening device

Abstract

The present invention discloses an inert gas protection type screening device, which relates to the technical field of screening equipment, and includes a workbench, a material storage unit, a screening unit and a clearing unit, wherein the material storage unit is arranged on the top of the workbench, the screening unit is arranged on the bottom of the material storage unit, and the clearing unit is arranged inside the screening unit, the material storage unit includes a silo and a feeding pipe, the top surface of the silo is provided with a silo air outlet valve, the silo air outlet valve is provided with a first oxygen sensor, and the bottom of the feeding pipe is provided with an electromagnetic feeder. The present invention replaces the air inside the equipment by introducing inert gas in real time, reduces the oxygen content in the equipment, and monitors the oxygen content in the equipment in real time to prevent oxygen from exceeding the standard, thereby ensuring the quality of the screened material. In addition, the material on each layer of the screen can be diffused from the middle of the screen to the surroundings for screening, thereby improving the screening effect. In addition, the anti-blocking ability of the screen is further improved during the screening process.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to an inert gas protection type screening device. Background Art

[0002] At present, materials such as precious metal powders and 3D printing materials need to be screened in the absence of air to ensure quality. Inert gas protection screening is an efficient and safe screening technology, which is particularly suitable for screening metal powders and other easily oxidized and easily adhered materials. By using inert gas to protect the screening process, it can effectively prevent the material from chemically reacting or being contaminated during the screening process, thereby improving the screening effect and product quality.

[0003] The Chinese patent application number 2017105685494 discloses a material anti-oxidation screening machine, including a bracket, a vertical circular sealed tank is installed on the bracket, the circular sealed tank is composed of an upper tank body and a lower tank body, and the butt ends of the upper and lower tank bodies are respectively provided with connecting flanges facing outwards, a circular vibrating screen is installed in the tank body, at least two internal and external pressure balancers are installed on the dust cover of the circular vibrating screen, a material barrel is led out from the center of the upper tank body from the inside of the circular vibrating screen upward on the dust cover, a vacuum valve and an inert gas charging valve are respectively installed on the side walls of the upper tank body, a pressure gauge is installed on the upper tank body head, and the circular vibrating screen The coarse material outlet and fine material outlet are respectively led out from the bottom of both sides of the lower tank body, and a coarse material receiving barrel and a fine material receiving barrel are respectively installed at the outer ends of the coarse material outlet and the fine material outlet. Double butterfly valves are respectively installed on the hoses connecting the barrel and the feeding port of the circular vibrating screen and between the coarse material outlet and the fine material outlet and their receiving barrels. The equipment is placed in a pressure vessel tank, vacuumed and then nitrogen or argon is injected to perform screening operations. This kind of screening situation cannot be continuously produced, and the investment is too large. The internal screening situation cannot be clearly seen, and the oxygen content cannot be monitored in real time, which can easily cause the oxygen content to exceed the standard and lead to a decrease in material quality.

[0004] In addition, during screening using a vibrating screen, the material is first screened by spreading from the middle of the top layer to the surrounding areas, but the material falling from the upper screen will be scattered in various areas on the lower screen, resulting in reduced screening effect of the material on the lower screen. In addition, the vibrating screen used for screening in the prior art has a poor anti-blocking effect, resulting in blockage during the screening process, affecting the screening efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide an inert gas protected screening device. The air inside the equipment is replaced by the real-time introduction of inert gas to reduce the oxygen content in the equipment, and the oxygen content in the equipment is monitored in real time to prevent oxygen from exceeding the standard, thereby ensuring the quality of the screened material. In addition, the material on each layer of the screen can be diffused from the middle of the screen to the surrounding area for screening, thereby improving the screening effect. In addition, the anti-blocking ability of the screen is further improved during the screening process, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an inert gas protection type screening device, comprising a workbench, a material storage unit, a screening unit and a clearing unit, wherein the material storage unit is arranged on the top of the workbench, the screening unit is arranged on the bottom of the material storage unit, and the clearing unit is arranged inside the screening unit;

[0007] The material storage unit comprises a silo and a feeding pipe, the top surface of the silo is provided with a silo air outlet valve, the silo air outlet valve is provided with a first oxygen sensor, the bottom of the feeding pipe is provided with an electromagnetic feeder, the top of the discharge trough of the electromagnetic feeder is provided with a sieve air outlet valve, the sieve air outlet valve is provided with a second oxygen sensor;

[0008] The screening unit comprises a base, a machine base, and a lower screening grid, a middle screening grid and an upper screening grid arranged in sequence from bottom to top on the top of the base;

[0009] The clearing unit comprises two mesh plates arranged up and down, a plurality of limit rings are placed on the mesh plates, no less than two elastic balls are placed in the limit rings, and a collecting plate is movably provided at the bottom of the mesh plate located on the upper side;

[0010] A magnet is arranged inside the elastic ball, and the magnet is an electromagnet. A wireless control component is arranged inside the limiting ring.

[0011] Furthermore, the silo is arranged on the top of the workbench through a fixed seat, the top surface of the silo is provided with a first air pressure sensor, the bottom of the silo is provided with a silo air inlet valve, the silo air inlet valve is connected to an external inert gas supply system, the down pipe is provided at the bottom of the silo, the down pipe is provided with a first butterfly valve, the top surface of the silo is provided with a material injection pipe, and the material injection pipe is provided with a second butterfly valve.

[0012] Furthermore, a material level sensor is provided on the top surface of the silo, a vibrator is provided on the side of the conical bucket at the bottom of the silo, and the feed port of the electromagnetic feeder is connected to the bottom end of the discharge pipe through a connecting hose.

[0013] Furthermore, the lower screen grid is detachably connected to the top of the machine base, springs are evenly arranged between the bottom of the machine base and the top of the base, a power unit is arranged on the top of the base through the machine base, and the power unit includes a vibration motor and an upper weight and a lower weight respectively arranged on the upper and lower output shafts of the vibration motor.

[0014] Furthermore, a lower discharge pipe is provided on the side of the lower screen grid, a screen machine air inlet valve is provided on the top of the lower discharge pipe, the screen machine air inlet valve is connected to an external inert gas supply system, a material guide plate is provided on the inner side of the lower screen grid, metal plates are evenly embedded on the top surface of the material guide plate, the middle part of the material guide plate protrudes upward, the material guide plate is made of rubber, and the edge of the material guide plate corresponds to the lower edge of the lower discharge pipe.

[0015] Furthermore, the middle sieve grid is detachably connected to the top of the lower sieve grid, a middle discharge pipe is provided on the side of the middle sieve grid, a middle screen is provided on the inner side of the middle sieve grid, the upper sieve grid is detachably connected to the top of the middle sieve grid, an upper screen is provided on the inner side of the upper sieve grid, an upper discharge pipe is provided on the side of the upper sieve grid, a top cover is provided on the top of the upper sieve grid, a feed pipe in the middle of the top cover is connected to the bottom discharge port of the electromagnetic feeder, and a second air pressure sensor is provided on the top cover.

[0016] Furthermore, the two mesh plates are respectively arranged at the bottom of the middle screen and the upper screen, the collecting plate is an inverted cone structure, a material guide pipe is provided in the middle of the collecting plate, the circumferential surface of the collecting plate is slidably matched with the inner wall of the middle screen, and the edge of the collecting plate is elastically connected to the inner wall of the middle screen through an elastic sheet.

[0017] Furthermore, the wireless control component includes a controller, a battery pack, a wireless communication module and a wire, the controller and the wireless communication module are both electrically connected to the battery pack, the controller is electrically connected to the magnet through the wire, and the wireless communication module is wirelessly connected to an external control terminal.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The present invention uses the first oxygen sensor and the second oxygen sensor to monitor the oxygen content in the silo and the screening unit during the gas washing process, and uses the oxygen analyzer to monitor the internal oxygen content of the silo and the screening unit during the screening process, and adopts a segmented and sealed manner to prevent the oxygen content from exceeding the standard, thereby ensuring the low oxygen content inside the silo and the screening unit of the equipment, thereby ensuring the quality of the material.

[0020] 2. In the present invention, when the material falls after being screened by the upper screen, it gathers along the inclined surface of the collecting plate to the material guide pipe, so that the material falls from the middle part above the middle screen, ensuring that the material falls from the middle part of the middle screen to diffuse to the surroundings and screened by rotation and vibration, thereby ensuring the screening effect of the material.

[0021] 3. The present invention controls the magnet in the elastic ball to intermittently generate magnetic force, and the elastic balls in the limiting ring are intermittently attracted and separated. At the same time, the adjacent limiting rings are attracted and separated under the action of the magnets in their respective areas, so that the position of each limiting ring changes continuously, and the internal elastic balls collide with different areas of the middle screen and the upper screen, thereby improving the anti-blocking effect of the screen.

[0022] 4. The present invention generates intermittent magnetic attraction on the lower collecting plate during intermittent power-on of the magnet, and the collecting plate moves upward. When the magnet is turned off, the elastic sheet returns to its original position, thereby realizing the up and down vibration of the collecting plate. The continuous change of the adsorption force of the magnet on the collecting plate is utilized to make the collecting plate vibrate irregularly, thereby preventing the material from adhering to the inner conical surface of the collecting plate and accumulating, thereby accelerating the discharge of the material.

[0023] 5. The present invention generates intermittent magnetic attraction to the metal plate when the magnet at the bottom generates magnetism intermittently, so that the rubber material guide plate shakes intermittently, and the material attached to the surface of the guide plate falls off, so that the material can be discharged more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the positional relationship between the material storage unit and the screening unit of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the material storage unit and the screening unit of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the screening unit of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the screening unit of the present invention;

[0029] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0030] Figure 7 It is a schematic diagram of the internal structure of the elastic ball of the present invention.

[0031] In the figure: 1. workbench; 2. material storage unit; 201. silo; 202. feeding pipe; 203. first butterfly valve; 204. material level sensor; 205. silo air inlet valve; 206. silo air outlet valve; 207. vibrator; 208. electromagnetic feeder; 209. screen machine air outlet valve; 210. connecting hose; 211. first air pressure sensor; 212. injection pipe; 3. screening unit; 301. base; 302. machine base; 303. spring; 304. power unit; 305. lower screen; 306. Lower discharge pipe; 307, screen machine air inlet valve; 308, guide plate; 309, middle screen grid; 310, middle discharge pipe; 311, middle screen; 312, upper screen grid; 313, upper screen; 314, upper discharge pipe; 315, top cover; 316, second air pressure sensor; 4, clearing unit; 401, mesh plate; 402, limit ring; 403, elastic ball; 4031, magnet; 404, battery pack; 405, wireless communication module; 406, wire; 407, collecting plate; 408, elastic sheet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-7 The present embodiment provides a technical solution: an inert gas protection screening device, comprising a workbench 1, a material storage unit 2, a screening unit 3 and a clearing unit 4, the material storage unit 2 is arranged on the top of the workbench 1, the material storage unit 2 is used to store materials to be screened, the screening unit 3 is arranged at the bottom of the material storage unit 2, the screening unit 3 is used for multi-stage screening of materials, the top of the screening unit 3 is connected to the bottom of the material storage unit 2, and the clearing unit 4 is arranged inside the screening unit 3.

[0034] The material storage unit 2 includes a silo 201 and a feeding pipe 202. The silo 201 is fixed on the top of the workbench 1 through a fixed seat. The top surface of the silo 201 is provided with a first air pressure sensor 211, and the first air pressure sensor 211 is used to detect the air pressure value in the silo 201. The bottom of the silo 201 is provided with a silo air inlet valve 205, and the silo air inlet valve 205 is connected to an external inert gas supply system. The silo air inlet valve 205 is used to allow external inert gas to enter from the bottom of the silo 201. The top surface of the silo 201 is provided with a silo air outlet valve 206, and the silo air outlet valve 206 is used to discharge the inert gas in the silo 201 from the top of the silo 201. The silo air inlet valve 205 and the silo air outlet valve 206 are both electrically controlled valves. A first oxygen sensor is provided on 206, and the first oxygen sensor is used to detect the oxygen content in the gas discharged from the silo outlet valve 206. A filling pipe 212 is provided on the top surface of the silo 201, and the filling pipe 212 is used to add materials into the silo 201, and the filling pipe 212 is sealed and connected with the external feeding system. A second butterfly valve is provided on the filling pipe 212, and the second butterfly valve is used to control the opening and closing of the filling pipe 212. A material level sensor 204 is provided on the top surface of the silo 201, and the material level sensor 204 is used to detect the remaining amount of material in the silo 201. A vibrator 207 is provided on the side of the bottom conical bucket of the silo 201. The vibrator 207 is preferably a pneumatic rotary vibrator, which vibrates the silo 201 to prevent blockage when discharging downward.

[0035] A feed pipe 202 is provided at the bottom of the silo 201. The feed pipe 202 is used for discharging materials downward. A first butterfly valve 203 is provided on the feed pipe 202. The first butterfly valve 203 controls the opening and closing of the feed pipe 202. An electromagnetic feeder 208 is provided at the bottom of the feed pipe 202. The feed port of the electromagnetic feeder 208 is connected to the bottom end of the feed pipe 202 through a connecting hose 210. When the materials in the silo 201 are discharged downward through the feed pipe 202, the electromagnetic feeder 208 discharges the materials into the screening unit 3. A screening machine air outlet valve 209 is provided at the top of the discharge trough of the machine 208. The screening machine air outlet valve 209 is used to discharge the inert gas in the screening unit 3. A second oxygen sensor is provided on the screening machine air outlet valve 209. The second oxygen sensor monitors the oxygen content in the gas in real time during the discharge of the gas from the screening machine air outlet valve 209 to determine the oxygen content in the screening unit 3. In addition, oxygen analyzers are respectively arranged inside the silo 201 and the screening unit 3 to monitor the oxygen content in the silo 201 and the screening unit 3 in real time during the screening process.

[0036] The screening unit 3 includes a base 301, a machine base 302, and a lower sieve grid 305, a middle sieve grid 309 and an upper sieve grid 312 which are arranged on the top of the base 301 from bottom to top. Springs 303 are evenly arranged between the bottom of the machine base 302 and the top of the base 301. A power unit 304 is arranged on the top of the base 301 through the machine base 302. The power unit 304 includes a vibration motor and an upper weight and a lower weight respectively arranged on the upper and lower output shafts of the vibration motor. The vibration motor drives the upper and lower weights of the eccentric structure to rotate, and under the action of the spring 303, the lower sieve grid 305, the middle sieve grid 309 and the upper sieve grid 312 are vibrated, thereby realizing the rotation vibration of the middle screen 311 and the upper screen 313, thereby realizing the rotation vibration screening of the material. The principle here is an existing mature technology and will not be elaborated in detail.

[0037] The lower sieve grid 305 is detachably connected to the top of the machine base 302, and a lower discharge pipe 306 is provided on the side of the lower sieve grid 305. A screen machine air inlet valve 307 is provided on the top of the lower discharge pipe 306. The screen machine air inlet valve 307 is connected to the external inert gas supply system. The screen machine air inlet valve 307 and the screen machine air outlet valve 209 are both electrically controlled valves. The inert gas enters the interior of the screening unit 3 from the lower discharge pipe 306 through the screen machine air inlet valve 307. A guide plate 308 is provided on the inner side of the lower sieve grid 305. The middle part of the guide plate 308 protrudes upward, and the edge of the guide plate 308 corresponds to the lower edge of the lower discharge pipe 306. The guide plate 308 is used to guide the material that has undergone multi-stage screening so that the material can be discharged smoothly from the lower discharge pipe 306.

[0038] The middle sieve grid 309 is detachably connected to the top of the lower sieve grid 305, a middle discharge pipe 310 is provided on the side of the middle sieve grid 309, a middle screen 311 is provided on the inner side of the middle sieve grid 309, the middle screen 311 is used for secondary screening of materials, and the middle discharge pipe 310 discharges the materials after secondary screening.

[0039] The upper sieve grid 312 is detachably connected to the top of the middle sieve grid 309. An upper sieve 313 is provided on the inner side of the upper sieve grid 312. The sieve hole diameter of the upper sieve 313 is larger than the sieve hole diameter of the middle sieve 311. The upper sieve 313 is used for primary screening of materials. An upper discharge pipe 314 is provided on the side of the upper sieve grid 312. The upper discharge pipe 314 is used to discharge the materials after the primary screening. The lower discharge pipe 306, the middle discharge pipe 310 and the upper discharge pipe 314 are connected to each other. The bottom discharge ports are all provided with electric valves, and the bottom discharge ports of the lower discharge pipe 306, the middle discharge pipe 310 and the upper discharge pipe 314 are respectively sealed and connected to the external material collecting device, and a top cover 315 is provided on the top of the upper screen grid 312. The feed pipe in the middle of the top cover 315 is connected to the bottom discharge port of the electromagnetic feeder 208, and a second air pressure sensor 316 is provided on the top cover 315. The second air pressure sensor 316 is used to detect the air pressure value in the screening unit 3.

[0040] The clearing unit 4 includes two mesh plates 401 arranged up and down, and the two mesh plates 401 are respectively arranged at the bottom of the middle screen 311 and the upper screen 313. A plurality of limiting rings 402 are placed on the mesh plates 401. The limiting rings 402 are used to limit the elastic balls 403. No less than two elastic balls 403 are placed in the limiting rings 402. During the screening process, the elastic balls 403 bounce and collide in the limiting rings 402 to generate vibrations in the screen 311 and the upper screen 313, thereby preventing the screens from being blocked.

[0041] When in use, firstly, the inside of the silo 201 and the screening unit 3 are washed, the silo air inlet valve 205, the silo air outlet valve 206, the screen machine air inlet valve 307 and the screen machine air outlet valve 209 are opened, and the first butterfly valve 203, the second butterfly valve and each electric valve are closed, and an external inert gas supply system is used to respectively introduce inert gas into the silo air inlet valve 205 and the screen machine air inlet valve 307. The inert gas is preferably nitrogen. The inert gas replaces and discharges the air inside the silo 201 and the screening unit 3 from the silo air outlet valve 206 and the screen machine air outlet valve 209, respectively. At the same time, the first oxygen sensor detects the oxygen content in the gas discharged from the silo air outlet valve 206, and the second oxygen sensor detects the oxygen content in the gas discharged from the silo air outlet valve 206. The oxygen content in the gas discharged from the screening machine outlet valve 209 is detected. When the first oxygen sensor and the second oxygen sensor detect that the oxygen content in the discharged gas is reduced to the respective oxygen content thresholds, the silo outlet valve 206 and the screening machine outlet valve 209 are closed, and the inert gas is continuously filled. At this time, the first air pressure sensor 211 and the second air pressure sensor 316 are used to monitor the air pressure values ​​in the silo 201 and the screening unit 3 respectively. When the air pressure values ​​in the silo 201 and the screening unit 3 reach the respective air pressure thresholds set by the first air pressure sensor 211 and the second air pressure sensor 316, the silo inlet valve 205 and the screening machine inlet valve 307 are closed, the introduction of the inert gas is stopped, and the gas washing is completed.

[0042] After the air washing is completed, the second butterfly valve is opened first, and the external feeding system is used to feed the material into the silo 201. At this time, since the injection pipe 212 is sealed and connected to the external feeding system, the external air cannot enter the injection pipe 212, and then the power unit 304 and the electromagnetic feeder 208 are started, and finally the first butterfly valve 203 is started, and the electric valve is opened. After the first butterfly valve 203 is opened, the material in the silo 201 is discharged into the screening unit 3 under the action of the electromagnetic feeder 208. The top of the guide trough of the electromagnetic feeder 208 is closed. The feeding of the electromagnetic feeder 208 is an existing mature technology, and the specific working principle is not repeated here. After the material enters the upper screen grid 312, it first falls on the middle of the upper screen 313, and the material is diffused to the surroundings under the action of the rotary vibration force, and vibrates up and down at the same time to realize the screening of the material. The material with qualified particle size passes through the upper screen grid 312. The screen 313 falls on the middle screen 311 through the through holes on the mesh plate 401, and materials with unqualified particle sizes are discharged from the bottom of the upper discharge pipe 314 into an external collection device under the action of the rotary vibration force. The qualified materials screened by the upper screen 313 fall on the middle screen 311 and are screened again by the rotary vibration force for the second stage. The retained materials are discharged into an external collection device through the middle discharge pipe 310, and the qualified particle sizes fall on the guide plate 308 through the lower mesh plate 401, and are discharged into an external collection device through the lower discharge pipe 306. When collecting materials, in order to prevent external air from entering, it is preferably collected by negative pressure collection. The air in the collection container is extracted by an external vacuum pump, so that the collection container is in a negative pressure state, and the air in the collection container is discharged at the same time to ensure the quality of the material.

[0043] During the screening process, oxygen analyzers are respectively arranged inside the silo 201 and the screening unit 3 to monitor the oxygen content inside the silo 201 and the screening unit 3 in real time to avoid excessive oxygen content and affect the material quality.

[0044] During screening, the vibration of the mesh plate 401 drives the elastic balls 403 to vibrate, and the elastic balls 403 located at the upper and middle parts bounce upward and hit the upper screen 313 and the middle screen 311 respectively, causing the upper screen 313 and the middle screen 311 to vibrate, thereby preventing blockage during the screening process.

[0045] However, after the material is screened by the upper screen 313, it is discharged from the bottom of each area of ​​the upper screen 313 and falls on each area of ​​the surface of the middle screen 311, so that the material cannot be screened from the middle of the middle screen 311, resulting in a reduced screening effect. Therefore, the following improvements are made:

[0046] A collecting plate 407 is movably provided at the bottom of the mesh plate 401 on the upper side. The collecting plate 407 is an inverted cone structure. A material guide pipe is provided in the middle of the collecting plate 407. The collecting plate 407 is used to collect the materials that have passed the first-stage screening in the middle of the collecting plate 407.

[0047] When in use, when the material that has passed the first-stage screening falls through the mesh plate 401, the material falling from each area falls on the inner conical surface of the collecting plate 407, and is gathered along the inner conical surface of the collecting plate 407 to the material guide pipe in the middle, so that the material that has completed the first-stage screening passes through the material guide pipe of the collecting plate 407 and falls in the middle of the middle screen 311 and is subjected to rotational vibration screening, thereby ensuring the screening effect of the material.

[0048] In addition, during the screening process, due to the limited range of motion of the limit ring 402, the elastic ball 403 can only jump in a certain area, resulting in a limited impact area of ​​the elastic ball 403 on the middle screen 311 and the upper screen 313, which leads to a reduction in the anti-blocking effect in some areas. In order to solve the above problems:

[0049] A magnet 4031 is provided in the elastic ball 403. The magnet 4031 is an electromagnet. When the magnet 4031 is energized, magnetism is generated. When the elastic ball 403 bounces under the rotational vibration force, the magnet 4031 is intermittently energized to change the bouncing position of the elastic ball 403 by utilizing the magnetic attraction and repulsion between the elastic balls 403 in the same limiting ring 402 and between limiting rings 402 at different positions.

[0050] A wireless control component is provided inside the limit ring 402, and the wireless control component includes a controller, a battery pack 404, a wireless communication module 405 and a wire 406. The controller, the wireless communication module 405 and the battery pack 404 are electrically connected. The controller is electrically connected to the magnet 4031 through the wire 406. The wireless communication module 405 is wirelessly connected to an external control terminal so that the opening and closing of the magnet 4031 can be controlled by the external control terminal. The control terminal is preferably a PLC control terminal, and the control terminal is electrically connected to each electrical component.

[0051] When in use, during the screening process, an external control terminal is used to send a signal to the wireless communication module 405, and the magnet 4031 inside the elastic ball 403 is intermittently started through the controller. The magnet 4031 intermittently generates magnetic force, and the elastic balls 403 in the same limit ring 402 are intermittently attracted and separated, and the adjacent limit rings 402 are also attracted and separated under the magnetic action of their respective internal magnets 4031, so that the position of each limit ring 402 continues to change, so that the elastic ball 403 in the limit ring 402 hits and vibrates different areas of the middle screen 311 and the upper screen 313 during the bouncing process, thereby further improving the anti-blocking effect of each screen.

[0052] In addition, when the materials after the primary screening are collected in the middle material guide pipe along the inner conical surface of the collecting plate 407, some materials, especially powdered materials, will adhere to the inner conical surface of the collecting plate 407. It is difficult to prevent the adhesion of materials by only relying on the rotary vibration force to drive the vibration of the collecting plate 407, which makes it difficult for the materials to be collected in the middle along the conical surface, affecting the fluidity of the materials. Therefore, the following improvements are made:

[0053] The circumferential surface of the collecting plate 407 is slidably matched with the inner wall of the middle sieve grid 309. The collecting plate 407 is made of ferromagnetic material. The edge of the collecting plate 407 is elastically connected to the inner wall of the middle sieve grid 309 through an elastic sheet 408 to achieve elastic movement of the collecting plate 407 in the vertical direction.

[0054] When in use, and when the magnet 4031 in the elastic ball 403 is intermittently energized, the magnet 4031 generates magnetism intermittently, and when the magnet 4031 located on the upper side generates magnetism, it generates a magnetic attraction force on the collecting plate 407 on the lower side, and the magnet 4031 adsorbs the collecting plate 407 to move upward, and the elastic sheet 408 is stretched. When the magnet 4031 is turned off, the elastic sheet 408 drives the collecting plate 407 to move downward and reset, thereby achieving intermittent adsorption of the collecting plate 407, causing the collecting plate 407 to vibrate up and down, and under the action of the irregular jumping of the elastic ball 403, the adsorption force of the magnet 4031 on the collecting plate 407 changes, causing the collecting plate 407 to vibrate irregularly up and down, thereby effectively preventing the material from adhering to the inner conical surface of the collecting plate 407 and accumulating, thereby accelerating the discharge of the material.

[0055] In addition, when the secondary screened materials are dispersed along the convex surface of the guide plate 308, some of the materials will adhere to the convex surface of the guide plate 308, resulting in some of the materials being unable to be completely discharged through the lower discharge pipe 306. In order to solve the above problem:

[0056] The material guide plate 308 is made of rubber, which facilitates elastic deformation of the material guide plate 308. The circumferential surface of the material guide plate 308 is fixedly connected to the inner wall of the lower sieve grid 305. The top surface of the material guide plate 308 is evenly embedded with metal plates, which are made of ferromagnetic material. The magnetic attraction of the magnet 4031 to the metal plate is used to drive the material guide plate 308 to vibrate.

[0057] When in use, when the magnet 4031 in the elastic ball 403 located on the lower side generates magnetism intermittently, it generates intermittent magnetic attraction on the metal plate embedded in the guide plate 308. Since the guide plate 308 is made of rubber material, it has good elasticity, so that the guide plate 308 intermittently deforms upward, that is, the guide plate 308 intermittently shakes, shaking off the material tightly attached to the convex surface of the guide plate 308, so that the material is completely discharged through the lower discharge pipe 306.

[0058] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An inert gas protection type screening device, comprising a workbench (1), a material storage unit (2), a screening unit (3) and a clearing unit (4), characterized in that: The material storage unit (2) is arranged on the top of the workbench (1), the screening unit (3) is arranged on the bottom of the material storage unit (2), and the blockage clearing unit (4) is arranged inside the screening unit (3); The material storage unit (2) comprises a silo (201) and a discharge pipe (202); a silo air outlet valve (206) is provided on the top surface of the silo (201); a first oxygen sensor is provided on the silo air outlet valve (206); an electromagnetic feeder (208) is provided at the bottom of the discharge pipe (202); a sieve air outlet valve (209) is provided on the top of the discharge trough of the electromagnetic feeder (208); and a second oxygen sensor is provided on the sieve air outlet valve (209); The screening unit (3) comprises a base (301), a machine base (302), and a lower screening grid (305), a middle screening grid (309), and an upper screening grid (312) arranged in sequence from bottom to top on the top of the base (301); The blockage clearing unit (4) comprises two mesh plates (401) arranged one above the other, a plurality of limit rings (402) being placed on the mesh plates (401), at least two elastic balls (403) being placed in the limit rings (402), a collecting plate (407) being movably provided at the bottom of the mesh plate (401) located on the upper side, a magnet (4031) being provided in the elastic ball (403), the magnet (4031) being an electromagnet, and a wireless control component being provided inside the limit rings (402); The silo (201) is arranged on the top of the workbench (1) via a fixed seat, a first air pressure sensor (211) is arranged on the top surface of the silo (201), a silo air inlet valve (205) is arranged on the bottom of the silo (201), and the silo air inlet valve (205) is connected to an external inert gas supply system, the feed pipe (202) is arranged on the bottom of the silo (201), a first butterfly valve (203) is arranged on the feed pipe (202), and a material injection pipe (212) is arranged on the top surface of the silo (201), and a second butterfly valve is arranged on the material injection pipe (212); A lower discharge pipe (306) is provided on the side of the lower sieve grid (305), a sieve machine air intake valve (307) is provided on the top of the lower discharge pipe (306), and the sieve machine air intake valve (307) is connected to an external inert gas supply system; a guide plate (308) is provided on the inner side of the lower sieve grid (305), a metal plate is evenly embedded on the top surface of the guide plate (308), the middle part of the guide plate (308) is convex upward, the guide plate (308) is made of rubber, and the edge of the guide plate (308) corresponds to the lower edge of the lower discharge pipe (306); The middle sieve grid (309) is detachably connected to the top of the lower sieve grid (305); a middle discharge pipe (310) is provided on the side of the middle sieve grid (309); a middle screen (311) is provided on the inner side of the middle sieve grid (309); the upper sieve grid (312) is detachably connected to the top of the middle sieve grid (309); an upper screen (313) is provided on the inner side of the upper sieve grid (312); an upper discharge pipe (314) is provided on the side of the upper sieve grid (312); a top cover (315) is provided on the top of the upper sieve grid (312); a feed pipe in the middle of the top cover (315) is connected to the bottom discharge port of the electromagnetic feeder (208); and a second air pressure sensor (316) is provided on the top cover (315); The two mesh plates (401) are respectively arranged at the bottom of the middle screen (311) and the bottom of the upper screen (313); the collecting plate (407) is an inverted cone structure; a material guide pipe is arranged in the middle of the collecting plate (407); the circumferential surface of the collecting plate (407) is slidably matched with the inner wall of the middle screen grid (309); and the edge of the collecting plate (407) is elastically connected to the inner wall of the middle screen grid (309) via an elastic sheet (408).

2. The inert gas protection type screening device according to claim 1, characterized in that: A material level sensor (204) is provided on the top surface of the silo (201), a vibrator (207) is provided on the side of the conical bucket at the bottom of the silo (201), and a feed port of the electromagnetic feeder (208) is connected to the bottom end of the discharge pipe (202) via a connecting hose (210).

3. The inert gas protection type screening device according to claim 1, characterized in that: The lower screen grid (305) is detachably connected to the top of the machine base (302); springs (303) are evenly arranged between the bottom of the machine base (302) and the top of the base (301); a power unit (304) is arranged on the top of the base (301) through the machine base (302); the power unit (304) comprises a vibration motor and an upper weight and a lower weight respectively arranged on upper and lower output shafts of the vibration motor.

4. The inert gas protection type screening device according to claim 1, characterized in that: The wireless control component comprises a controller, a battery pack (404), a wireless communication module (405) and a wire (406); the controller and the wireless communication module (405) are both electrically connected to the battery pack (404); the controller is electrically connected to the magnet (4031) via the wire (406); and the wireless communication module (405) is wirelessly connected to an external control terminal.

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