Nitrogen-protected powder material screening device

Abstract

The present application relates to the technical fields of screening equipment, in particular to a nitrogen protection type powder material screening equipment.The present application comprises a screening box, the vertical inner wall of the screening box is fixedly connected with a screening mechanism, the top of the screening box is fixedly connected with a feeding pipe, the sidewall of the left side of the screening box is provided with a discharge port, and the discharge port is fixedly connected with a material guide groove, the bottom of the screening box is fixedly connected with a discharge pipe, the outside of the screening box is fixedly sleeved with a protective cover, the upper side of the protective cover is provided with a through hole, and the upper end of the feeding pipe penetrates through the protective cover through the through hole.The present application can reduce the temperature inside the screening box, effectively reduce the probability of dust explosion of the screening equipment, nitrogen can isolate the screening box, thereby reducing the damage caused by dust explosion of the screening, effectively improving the safety of the neodymium iron boron magnetic powder screening equipment, and effectively improving the screening effect of the neodymium iron boron magnetic powder screening equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screening equipment, in particular to a nitrogen protection type powder material screening equipment. BACKGROUND

[0002] Neodymium iron boron is a tetragonal crystal formed by neodymium, iron and boron, and is a kind of rare earth permanent magnetic material. The neodymium iron boron magnetic powder material is an important raw material for producing neodymium iron boron magnetic products. In the production and processing process, the neodymium iron boron magnetic powder material needs to be screened, so as to screen out the neodymium iron boron magnetic powder material whose size does not meet the requirements.

[0003] In the production and processing process of the existing neodymium iron boron magnetic powder material screening equipment, since the neodymium iron boron material is in powder form and the space inside the screening equipment is relatively narrow, sparks or high temperature generated in the running process of the screening equipment can easily cause dust explosion of the neodymium iron boron magnetic powder material, thereby causing production safety accidents. In addition, the neodymium iron boron magnetic powder material stays on the screening screen for a short time when the existing screening equipment is used, which reduces the screening effect. SUMMARY

[0004] The purpose of the present application is to provide a nitrogen protection type powder material screening equipment to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The present application provides a nitrogen protection type powder material screening equipment, which comprises a screening box, a screening mechanism is fixedly connected to the vertical inner wall of the screening box, a feeding pipe is fixedly communicated with the top of the screening box, a discharge port is formed in the side wall of the left side of the screening box, and a material guide groove is fixedly connected in the discharge port, a discharge pipe is fixedly communicated with the bottom of the screening box, a protective cover is fixedly sleeved outside the screening box, a through hole is formed in the upper side of the protective cover, the upper end of the feeding pipe penetrates through the protective cover through the through hole, a sealing pipe is fixedly communicated with the vertical side wall of the protective cover, one end of the sealing pipe is fixedly connected with the vertical outer wall of the screening box, the material guide groove is located in the sealing pipe, a socket is formed in the bottom of the protective cover, the discharge pipe penetrates through the protective cover through the socket, an air inlet pipe and an air outlet pipe are fixedly communicated with the upper side of the protective cover, an air inlet valve is fixedly communicated with the upper end of the air inlet pipe, an air outlet valve is fixedly communicated with the upper end of the air outlet pipe, an installation plate is fixedly connected with the vertical outer wall of the protective cover, an air pump is fixedly connected on the installation plate, the air outlet of the air pump is communicated with the air inlet valve, a pressure gauge is fixedly communicated with the side wall of the upper side of the protective cover, a thermometer is arranged on the top of the protective cover, a water tank is fixedly connected with the vertical outer wall of the protective cover, a coiled pipe is fixedly communicated with the vertical side wall of the protective cover, and the coiled pipe penetrates through the water tank.

[0007] In the nitrogen protection type powder material screening equipment, the screening mechanism comprises a plurality of fixed plates fixedly connected to the vertical inner wall of the screening box, a plurality of fixed rods are fixedly connected to the fixed plates, sliding plates are movably sleeved outside the fixed rods, springs are fixedly connected between the sliding plates and the fixed plates, the springs are movably sleeved outside the fixed rods, the same blocking frame is fixedly connected between the plurality of sliding plates, a sieve plate is fixedly connected to the bottom of the blocking frame, the sieve plate is inclined, the vertical outer wall of the blocking frame is symmetrically fixedly connected with two vibrators, a discharge hole corresponding to the material guide groove is formed in the left side of the blocking frame, and a plurality of inclined guide plates are fixedly connected to the side wall of the upper side of the sieve plate.

[0008] In the nitrogen protection type powder material screening equipment, the bottom of the protective cover is fixedly connected with four supporting columns, the four supporting columns are respectively located at the four corners of the bottom of the protective cover, and the lower ends of the four supporting columns are fixedly connected with foot seats.

[0009] In the nitrogen protection type powder material screening equipment, the same reinforcing rib plate is fixedly connected between the side wall of the lower side of the mounting plate and the vertical outer wall of the protective cover, and the connecting plates are fixedly connected between the reinforcing rib plate and the outer walls of the mounting plate and the protective cover.

[0010] In the nitrogen protection type powder material screening equipment, the same flow guide groove is fixedly connected between the four supporting columns, the flow guide groove is inclined, and the flow guide groove is located below the discharge pipe.

[0011] In the nitrogen protection type powder material screening equipment, a plurality of pin holes are formed in the plurality of foot seats, and the plurality of pin holes are uniformly distributed on the foot seats.

[0012] In the nitrogen protection type powder material screening equipment, the water tank comprises a tank body fixedly connected to the outer wall of the protective cover, a water inlet pipe is fixedly connected to the upper side of the tank body, a drain pipe is fixedly communicated with the bottom of the tank body, and a water stop valve is fixedly communicated with the end, away from the tank body, of the drain pipe.

[0013] In the nitrogen protection type powder material screening equipment, the upper side of the protective cover is fixedly communicated with an internally threaded pipe, an externally threaded pipe is fixedly sleeved on the thermometer, and the externally threaded pipe is threadedly sleeved in the internally threaded pipe.

[0014] In the nitrogen protection type powder material screening equipment, the upper end of the feed pipe is fixedly connected with a conical hopper, the diameter of the upper end of the conical hopper is larger than that of the lower end.

[0015] In the nitrogen protection type powder material screening equipment, a sealing pipe cover is threadedly sleeved on the pipe wall close to the upper end of the water inlet pipe.

[0016] The beneficial effects of the present application compared with the prior art are:

[0017] 1、The present application is provided with a screening box, a feeding pipe, a guide chute, a discharge pipe, a protective cover, a sealing pipe, an air inlet pipe, an air outlet pipe, an air inlet valve, an air outlet valve, a mounting plate, an air pump, a pressure gauge, a thermometer, a water tank and a serpentine pipe, and when in use, neodymium iron boron magnetic powder is added into the screening box through the feeding pipe, the neodymium iron boron magnetic powder falls onto the screening mechanism, the screening mechanism screens the neodymium iron boron magnetic powder, the screened neodymium iron boron magnetic powder is discharged through the discharge pipe and the guide chute, the air inlet valve is opened, the air outlet valve is closed, and nitrogen is introduced into the protective cover through the air pump, so that the cavity between the protective cover and the screening box is filled with nitrogen, the air pressure in the protective cover is monitored through the pressure gauge, thereby ensuring sufficient addition of nitrogen, water is added into the water tank, and when the nitrogen passes through the serpentine pipe, the water can cool the nitrogen, thereby reducing the temperature of the nitrogen in the protective cover, assisting in heat dissipation of the screening box inside the protective cover, thereby reducing the temperature inside the screening box, effectively reducing the probability of dust explosion of the screening equipment, the nitrogen can isolate the screening box, thereby reducing the damage caused by dust explosion during screening, and effectively improving the safety of the neodymium iron boron magnetic powder screening equipment in use.

[0018] 2、The present application is provided with a fixed plate, a fixed rod, a sliding plate, a spring, a blocking frame, a screen plate, a vibrator, a discharge hole and a flow guide plate, and when in use, the two vibrators are controlled to operate, the two vibrators drive the blocking frame to vibrate, the blocking frame drives multiple sliding plates to slide on multiple fixed rods, the multiple springs can improve the vibration frequency of the blocking frame, the blocking frame drives the screen plate to vibrate at a high frequency, the screen plate can efficiently screen the neodymium iron boron magnetic powder, and the multiple flow guide plates can increase the residence time of the neodymium iron boron magnetic powder on the screen plate, thereby improving the screening effect of the neodymium iron boron magnetic powder, and effectively improving the screening effect of the neodymium iron boron magnetic powder screening equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a schematic diagram of the structure of another direction of the present application;

[0021] Figure 3 It is a front view of the present application;

[0022] Figure 4 It is a side view of the present application;

[0023] Figure 5 It is a schematic diagram of the structure of the present application after removing the cover plate;

[0024] Figure 6 It isFigure 1 Structure diagram of the screening box;

[0025] Figure 7 For Figure 1 Structure diagram of the installation of the screening mechanism;

[0026] Figure 8 For Figure 1 Structure diagram of the screening mechanism;

[0027] Figure 9 For Figure 1 Structure diagram of the inside of the water tank.

[0028] In the figure: 1, screening box; 2, feeding pipe; 3, guide chute; 4, discharging pipe; 5, protective cover; 6, sealing pipe; 7, air inlet pipe; 8, air outlet pipe; 9, air inlet valve; 10, air outlet valve; 11, mounting plate; 12, air pump; 13, pressure gauge; 14, thermometer; 15, water tank; 16, coiled pipe; 17, fixed plate; 18, fixed rod; 19, sliding plate; 20, spring; 21, material blocking frame; 22, screen plate; 23, vibrator; 24, discharging hole; 25, guide plate; 26, support column; 27, foot base; 28, reinforcing rib plate; 29, connecting plate; 30, guide chute; 31, pin hole; 32, box body; 33, water inlet pipe; 34, drain pipe; 35, water stop valve; 36, internally threaded pipe; 37, externally threaded pipe; 38, conical hopper; 39, sealing pipe cover. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Please refer to Figures 1-9The present application provides a kind of nitrogen protection type powder material screening equipment, including screening box 1, the vertical inner wall of the screening box 1 is fixedly connected with screening mechanism, the top of the screening box 1 is fixedly communicated with feed pipe 2, the side wall of the left side of the screening box 1 is equipped with discharge port, and discharge port is fixedly connected with guide chute 3 in, the bottom of the screening box 1 is fixedly communicated with discharge pipe 4, the outer fixed sleeve of the screening box 1 is equipped with protective cover 5, the upper side of the protective cover 5 is equipped with through-hole, the upper end of the feed pipe 2 is passed through the protective cover 5 by through-hole, the vertical side wall of the protective cover 5 is fixedly communicated with sealing pipe 6, one end of the sealing pipe 6 is fixedly connected with the vertical outer wall of the screening box 1, the guide chute 3 is located in the sealing pipe 6, the bottom of the protective cover 5 is equipped with socket, the discharge pipe 4 is passed through the protective cover 5 by socket, the upper side of the protective cover 5 is fixedly communicated with inlet pipe 7 and outlet pipe 8, the upper end of the inlet pipe 7 is fixedly communicated with inlet valve 9, the upper end of the outlet pipe 8 is fixedly communicated with outlet valve 10, the vertical outer wall of the protective cover 5 is fixedly connected with mounting plate 11, the mounting plate 11 is fixedly connected with air pump 12, the air outlet of the air pump 12 is communicated with inlet valve 9, the side wall of the upper side of the protective cover 5 is fixedly communicated with pressure gauge 13, the top of the protective cover 5 is provided with thermometer 14, the vertical outer wall of the protective cover 5 is fixedly connected with water tank 15, the vertical side wall of the protective cover 5 is fixedly communicated with serpentine pipe 16, and the serpentine pipe 16 passes through water tank 15.

[0031] In the above embodiment, when using, neodymium iron boron magnetic powder material is added to the screening box 1 through the feed pipe 2, the neodymium iron boron magnetic powder material falls on the screening mechanism, the screening mechanism screens the neodymium iron boron magnetic powder material, and the screened neodymium iron boron magnetic powder material is discharged through the discharge pipe 4 and the guide chute 3 respectively, the inlet valve 9 is opened, the outlet valve 10 is closed, the air pump 12 is used to introduce nitrogen into the protective cover 5, so that the cavity between the protective cover 5 and the screening box 1 is filled with nitrogen, and the air pressure in the protective cover 5 is monitored by the pressure gauge 13, so that the nitrogen can be added sufficiently, water is added into the water tank 15, when the nitrogen passes through the serpentine pipe 16, the water can cool the nitrogen, so that the temperature of the nitrogen in the protective cover 5 can be reduced, the screening box 1 in the protective cover 5 can be assisted to radiate heat, so that the temperature in the screening box 1 can be reduced, the probability of dust explosion of the screening equipment is effectively reduced, the nitrogen can isolate the screening box 1, so that the damage caused by dust explosion of screening can be reduced, and the safety of the neodymium iron boron magnetic powder screening equipment is effectively improved.

[0032] The screening mechanism comprises a plurality of fixed plates 17 fixedly connected to the vertical inner wall of the screening box 1, a plurality of fixed rods 18 fixedly connected to the fixed plates 17, sliding plates 19 movably sleeved outside the fixed rods 18, springs 20 fixedly connected between the sliding plates 19 and the fixed plates 17, the springs 20 movably sleeved outside the fixed rods 18, a same material blocking frame 21 fixedly connected between a plurality of the sliding plates 19, a screen plate 22 fixedly connected to the bottom of the material blocking frame 21, the screen plate 22 being obliquely arranged, two vibrators 23 symmetrically fixedly connected to the vertical outer wall of the material blocking frame 21, a discharging hole 24 corresponding to the material guide groove 3 being formed in the left side of the material blocking frame 21, and a plurality of inclined flow guide plates 25 fixedly connected to the sidewall of the upper side of the screen plate 22.

[0033] In the embodiment, when in use, the two vibrators 23 are controlled to operate, the two vibrators 23 drive the material blocking frame 21 to vibrate, the material blocking frame 21 drives a plurality of the sliding plates 19 to slide on the fixed rods 18, the plurality of springs 20 arranged can improve the frequency of vibration of the material blocking frame 21, the material blocking frame 21 drives the screen plate 22 to vibrate at a high frequency, the screen plate 22 can efficiently screen the Nd-Fe-B magnetic powder material, and the plurality of flow guide plates 25 arranged can improve the time for the Nd-Fe-B magnetic powder material to stay on the screen plate 22, thereby improving the screening effect of the Nd-Fe-B magnetic powder material, and effectively improving the screening effect of the Nd-Fe-B magnetic powder material screening device.

[0034] The bottom of the protective cover 5 is fixedly connected with four supporting columns 26, the four supporting columns 26 are respectively located at the four corners of the bottom of the protective cover 5, and the lower ends of the four supporting columns 26 are fixedly connected with foot bases 27.

[0035] In the embodiment, the supporting columns 26 and the foot bases 27 cooperatively arranged can improve the stability of the screening device, and effectively improve the stability of the Nd-Fe-B magnetic powder material screening device during operation.

[0036] The same reinforcing rib plate 28 is fixedly connected between the sidewall of the lower side of the mounting plate 11 and the vertical outer wall of the protective cover 5, and the connecting plates 29 are fixedly connected between the reinforcing rib plate 28 and the outer walls of the mounting plate 11 and the protective cover 5.

[0037] In the above embodiment, the connecting plates 29 and the reinforcing rib plate 28 cooperatively arranged can reinforce the connection between the mounting plate 11 and the protective cover 5, and can support the mounting plate 11, effectively improve the load-bearing performance of the mounting plate 11, and effectively improve the stability of the operation of the air pump 12.

[0038] The same flow guide groove 30 is fixedly connected between the four supporting columns 26, the flow guide groove 30 is obliquely arranged, and the flow guide groove 30 is located below the discharging pipe 4.

[0039] In the embodiment, the diversion groove 30 is arranged to receive the Nd-Fe-B magnetic powder falling from the discharge pipe 4, and the Nd-Fe-B magnetic powder can flow along the inclined diversion groove 30 to a designated position, thereby effectively improving the convenience of collecting the Nd-Fe-B magnetic powder.

[0040] A plurality of pin holes 31 are formed in the foot base 27, and the pin holes 31 are uniformly distributed on the foot base 27.

[0041] In the above embodiment, the plurality of pin holes 31 are arranged to improve the convenience of fixing and installing the foot base 27.

[0042] The water tank 15 comprises a tank body 32 fixedly connected to the outer wall of the protective cover 5, the upper side of the tank body 32 is fixedly connected with a water inlet pipe 33, the bottom of the tank body 32 is fixedly connected with a drain pipe 34, and the end of the drain pipe 34 away from the tank body 32 is fixedly connected with a stop valve 35.

[0043] In the embodiment, when in use, water is added to the tank body 32 through the water inlet pipe 33, the stop valve 35 is opened, and the water in the tank body 32 is discharged through the drain pipe 34, which is simple and convenient to operate, and improves the convenience of adding and replacing water in the water tank 15.

[0044] The upper side of the protective cover 5 is fixedly connected with an internally threaded pipe 36, and the thermometer 14 is fixedly sleeved with an externally threaded pipe 37, and the externally threaded pipe 37 is threadedly sleeved in the internally threaded pipe 36.

[0045] In the above embodiment, the internally threaded pipe 36 and the externally threaded pipe 37 are arranged to cooperate with each other, thereby improving the convenience of installing the thermometer 14.

[0046] The upper end of the feed pipe 2 is fixedly connected with a conical hopper 38, and the diameter of the upper end of the conical hopper 38 is greater than that of the lower end.

[0047] In the embodiment, the conical hopper 38 is arranged to improve the convenience of feeding the feed pipe 2, thereby improving the convenience of adding the Nd-Fe-B magnetic powder to the screening equipment.

[0048] The pipe wall of the water inlet pipe 33 near the upper end is threadedly sleeved with a sealing pipe cover 39.

[0049] In the above embodiment, the sealing pipe cover 39 is arranged to seal the water inlet pipe 33, thereby avoiding dirt from entering the water tank 15 through the water inlet pipe 33.

[0050] Working principle: in use, through the feeding pipe 2 to the screening box 1 in the addition of Nd-Fe-B magnetic powder, Nd-Fe-B magnetic powder falls on the screening mechanism, the screening mechanism on Nd-Fe-B magnetic powder screening, screening after Nd-Fe-B magnetic powder respectively through the discharge pipe 4 and guide chute 3 discharge, open inlet valve 9, close outlet valve 10, over the air pump 12 into the protective cover 5 between the cavity of nitrogen, nitrogen fills the protective cover 5 and screening box 1, through the pressure gauge 13 monitoring the pressure in the protective cover 5, so as to ensure the nitrogen addition sufficient, to the water tank 15 in the water, when the nitrogen through the serpentine pipe 16, water can cool nitrogen, so as to reduce the temperature of nitrogen in the protective cover 5, can assist the screening box 1 in the protective cover 5 inside heat dissipation, so as to reduce the temperature inside the screening box 1, effectively reduce the probability of screening equipment dust explosion, nitrogen can isolate the screening box 1, so as to reduce the screening damage caused by dust explosion, effectively improve the safety of Nd-Fe-B magnetic powder screening equipment use;

[0051] In use, control two vibrator 23 operation, two vibrator 23 drive the blocking material frame 21 vibration, blocking material frame 21 drive a plurality of sliding plate 19 on a plurality of fixed rod 18 sliding, the setting of a plurality of springs 20 can improve the frequency of blocking material frame 21 vibration, blocking material frame 21 drive the screen plate 22 high frequency vibration, screen plate 22 can be efficient screening of Nd-Fe-B magnetic powder, the setting of a plurality of guide plate 25 can improve the time of Nd-Fe-B magnetic powder on the screen plate 22, so as to improve the screening effect of Nd-Fe-B magnetic powder, effectively improve the screening effect of Nd-Fe-B magnetic powder screening equipment;

[0052] The setting of support column 26 and foot 27 cooperation, can improve the stability of the screening equipment placed, and effectively improve the stability of Nd-Fe-B magnetic powder screening equipment when running;

[0053] The setting of connecting plate 29 and reinforcing rib plate 28 cooperation, can reinforce the connection between the mounting plate 11 and the protective cover 5, and can support the mounting plate 11, effectively improve the bearing capacity of mounting plate 11, effectively improve the stability of air pump 12 operation;

[0054] The setting of guide groove 30 can be connected to the falling of Nd-Fe-B magnetic powder in the discharge pipe 4, Nd-Fe-B magnetic powder can flow to the designated position along the inclined guide groove 30, effectively improve the convenience of Nd-Fe-B magnetic powder collection;

[0055] In use, through the water inlet pipe 33 to the box 32 in the addition of water, open the water valve 35, the water in the box 32 through the drain pipe 34 discharge, simple and convenient operation, improve the convenience of water adding and replacing in the water tank 15;

[0056] The conical hopper 38 can improve the convenience of feeding the feeding pipe 2 and improve the convenience of adding Nd-Fe-B magnetic powder to the screening device;

[0057] The sealing pipe cover 39 can seal the water inlet pipe 33, so that dirt entering the water tank 15 from the water inlet pipe 33 can be avoided.

[0058] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A nitrogen-protected powder material screening device, comprising a screening box (1), characterized in that: A screening mechanism is fixedly connected to the vertical inner wall of the screening box (1). A feed pipe (2) is fixedly connected to the top of the screening box (1). A discharge port is opened on the left side wall of the screening box (1), and a guide groove (3) is fixedly connected inside the discharge port. A discharge pipe (4) is fixedly connected to the bottom of the screening box (1). A protective cover (5) is fixedly fitted on the outside of the screening box (1). A through hole is opened on the upper side of the protective cover (5). The upper end of the feed pipe (2) passes through the protective cover (5) through the through hole. A sealing pipe (6) is fixedly connected to the vertical side wall of the protective cover (5). One end of the sealing pipe (6) is fixedly connected to the vertical outer wall of the screening box (1). The guide groove (3) is located inside the sealing pipe (6). An insertion port is opened at the bottom of the protective cover (5). The discharge pipe (4) passes through the insertion port. The protective cover (5) has an air inlet pipe (7) and an air outlet pipe (8) fixedly connected to its upper side. The upper end of the air inlet pipe (7) is fixedly connected to an air inlet valve (9), and the upper end of the air outlet pipe (8) is fixedly connected to an air outlet valve (10). The vertical outer wall of the protective cover (5) is fixedly connected to an installation plate (11), and an air pump (12) is fixedly connected to the installation plate (11). The air outlet of the air pump (12) is connected to the air inlet valve (9). The upper side wall of the protective cover (5) is fixedly connected to a pressure gauge (13). The top of the protective cover (5) is equipped with a thermometer (14). The vertical outer wall of the protective cover (5) is fixedly connected to a water tank (15). The vertical side wall of the protective cover (5) is fixedly connected to a serpentine tube (16), which passes through the water tank (15).

2. The nitrogen-protected powder material screening device according to claim 1, characterized in that: The screening mechanism includes multiple fixed plates (17) fixedly connected to the vertical inner wall of the screening box (1). Each fixed plate (17) is fixedly connected to a fixed rod (18). A sliding plate (19) is movably sleeved on the outside of the fixed rod (18). A spring (20) is fixedly connected between the sliding plate (19) and the fixed plate (17). The spring (20) is movably sleeved on the outside of the fixed rod (18). The multiple sliding plates (19) are fixedly connected to the same baffle frame (21). A screen plate (22) is fixedly connected to the bottom of the baffle frame (21). The screen plate (22) is inclined. Two vibrators (23) are symmetrically fixedly connected to the vertical outer wall of the baffle frame (21). A discharge hole (24) corresponding to the guide groove (3) is opened on the left side of the baffle frame (21). Multiple inclined guide plates (25) are fixedly connected to the upper side wall of the screen plate (22).

3. The nitrogen-protected powder material screening device according to claim 2, characterized in that: The bottom of the protective cover (5) is fixedly connected to four support columns (26), which are located at the four corners of the bottom of the protective cover (5). The lower ends of the four support columns (26) are fixedly connected to feet (27).

4. The nitrogen-protected powder material screening device according to claim 1, characterized in that: The same reinforcing rib (28) is fixedly connected between the lower side wall of the mounting plate (11) and the vertical outer wall of the protective cover (5). A connecting plate (29) is fixedly connected between the reinforcing rib (28) and the outer wall of the mounting plate (11) and the protective cover (5).

5. A nitrogen-protected powder material screening device according to claim 3, characterized in that: The four support columns (26) are fixedly connected to the same guide channel (30), the guide channel (30) is inclined and located below the discharge pipe (4).

6. A nitrogen-protected powder material screening device according to claim 3, characterized in that: Multiple pin holes (31) are provided on each of the multiple foot bases (27), and the multiple pin holes (31) are evenly distributed on the foot bases (27).

7. The nitrogen-protected powder material screening device according to claim 1, characterized in that: The water tank (15) includes a box body (32) fixedly connected to the outer wall of the protective cover (5). A water inlet pipe (33) is fixedly connected to the upper side of the box body (32). A drain pipe (34) is fixedly connected to the bottom of the box body (32). A stop valve (35) is fixedly connected to the end of the drain pipe (34) away from the box body (32).

8. The nitrogen-protected powder material screening device according to claim 1, characterized in that: The upper side of the protective cover (5) is fixedly connected to an internal threaded tube (36), and the thermometer (14) is fixedly fitted with an external threaded tube (37), which is threaded into the internal threaded tube (36).

9. A nitrogen-protected powder material screening device according to claim 1, characterized in that: The upper end of the feed pipe (2) is fixedly connected to a conical hopper (38), and the diameter of the upper end of the conical hopper (38) is larger than the diameter of the lower end.

10. A nitrogen-protected powder material screening device according to claim 7, characterized in that: The inlet pipe (33) has a sealing cap (39) threaded onto the pipe wall near the upper end.

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