Miniature powder cleaning machine for laboratory

Abstract

The utility model provides a miniature powder cleaning machine for a laboratory, which comprises a flexible connecting seat, two screen boats arranged on the flexible connecting seat, an air suction cover arranged above the two screen boats, and two material guide components respectively connected to the bottoms of the screen boats, and each material guide component is provided with two material receiving cavities; a plurality of screening layers are distributed in the screening ship in a stacked mode, and a distributing mechanism is arranged below the screening layers and used for distributing materials falling from the screening layers into the two material receiving cavities. A maintenance valve, a first air inlet curve and a second air inlet curve are arranged at the part, aligned with the distribution mechanism, of the side wall of the screening ship; the first air inlet bend and the second air inlet bend are located on the upper side and the lower side of the overhaul valve correspondingly, and the first air inlet bend and the second air inlet bend form an obliquely-downward air inlet angle in the screen ship. According to the miniature powder cleaning machine for the laboratory, the air inlet efficiency can be improved, and meanwhile waste and influence on the experimental environment caused by outward leakage of materials are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of flour processing equipment, and particularly relates to a micro purifier for laboratory use. Background Art

[0002] A purifier is used to separate endosperm particles with different purities from the materials ground by a flour mill. It consists of a sieve body equipped with multiple layers of sieve surfaces, along with an air duct, an air chamber, etc. During operation, the air flow passes upward through each layer of sieve surface from below the sieve body in sequence, enabling the materials entering the purifier to be separated under the combined action of vibration and air flow. Among them, the light bran is sucked away by the air flow, and the endosperm with bran is output as oversize material and sent back to the flour mill for another cycle to remove the endosperm particles with bran. The pure and relatively pure endosperm particles enter the flour mill as undersize material for further grinding into flour.

[0003] Currently, different technological parameters are required for grinding different varieties of wheat. To obtain accurate technological parameters, experiments need to be carried out. Therefore, it is very necessary to develop a micro purifier suitable for laboratory applications. Although the specific structure of the micro purifier can be made by scaling down proportionally based on the actual processing purifier, if the conventional method of opening a single air inlet on the side wall of the sieve boat is used for the micro purifier, there will be a problem of insufficient air intake. If the air intake efficiency is simply improved by increasing the air inlet, it will cause the powder materials in the sieve boat to leak outwards, which not only affects the normal working environment but also causes serious waste. Summary of the Utility Model

[0004] An embodiment of the utility model provides a micro purifier for laboratory use, aiming to optimize the air intake structure of the micro purifier for laboratory use, improve the air intake efficiency and avoid leakage.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a micro purifier for laboratory use, including a flexible connection seat, two sieve boats arranged on the flexible connection seat, an air suction hood arranged above the two sieve boats, and two feeding assemblies respectively connected to the bottom of each sieve boat. Each feeding assembly has two receiving cavities; multiple sieve layers are stacked and distributed inside the sieve boat. A distribution mechanism is arranged below the sieve layers to distribute the materials falling from the sieve layers into the two receiving cavities; maintenance hatches, a first air inlet bend and a second air inlet bend are arranged at the positions on the side wall of the sieve boat aligned with the distribution mechanism; wherein, the first air inlet bend and the second air inlet bend are respectively located above and below the maintenance hatch, and both form an air intake angle inclined downward inside the sieve boat.

[0006] In a possible implementation, a maintenance window is provided on the side wall of the screening ship. The maintenance window includes an upper window frame and a lower window frame; the sorting mechanism includes two guide plates spaced apart and with a gradually decreasing spacing from top to bottom. A first air inlet bend is formed between the upper end of one of the guide plates and the upper window frame; a folding beam is arranged at intervals above the lower window frame. A second air inlet bend is formed between the folding beam and the lower window frame, and the maintenance door is connected between the folding beam and the guide plate.

[0007] In some embodiments, the upper window frame includes a first sheet metal and a second sheet metal. The first sheet metal and the second sheet metal are joined to form a first included angle space with the mouth facing downwards. The upper end of the guide plate extends into the first included angle space to form a first air inlet bend.

[0008] Exemplarily, the top surface of the lower window frame includes a first inclined surface and a second inclined surface arranged at an angle. The first inclined surface and the second inclined surface are joined to form a folding angle structure; the folding beam includes a first folding surface and a second folding surface. The first folding surface and the second folding surface are joined to form a second included angle space with the mouth facing downwards. The folding angle structure extends into the second included angle space to form a second air inlet bend.

[0009] For example, a plurality of connecting rods are spaced apart on the folding beam. One end of the connecting rod passes through the folding beam downwards and is fixedly connected to the lower window frame. The other end of the connecting rod extends upwards and is hinged to the maintenance door; a door stop strip is provided on the surface of the guide plate facing the folding beam. One side edge of the maintenance door overlaps on the door stop strip and forms an inclined closed state.

[0010] In a possible implementation, the guide component includes a receiving box fixedly connected to the bottom of the screening ship, as well as a first guide trough, a second guide trough, and a guide slide plate; wherein, the interior of the receiving box is partitioned into two receiving cavities, and two mounting positions are provided at the bottom of each receiving cavity. Each mounting position is detachably connected to the first guide trough or the second guide trough or the guide slide plate.

[0011] In some embodiments, the receiving box includes a middle partition board, two side boxes, and two side plates; the two side boxes are symmetrically connected to both ends of the middle partition board; the two side plates are symmetrically connected to both sides of the middle partition board, and both ends of the side plates are lapped and fixed to the side walls of the two side boxes respectively; wherein, the upper edges of the two side plates are both connected to the screening ship, and the two side plates and the middle partition board form receiving cavities respectively, and both ends of the middle partition board extend into the two side boxes respectively and partition the internal space of the side boxes.

[0012] Exemplarily, the bottom of the first guide trough is an inclined surface, and the bottom of the second guide trough is a V-shaped folding surface; wherein, a discharge pipe is provided at the low end of the inclined surface and the bending part of the V-shaped folding surface.

[0013] For example, when the first guide chute or the second guide chute is respectively connected to two mounting positions of the material receiving cavity, a partition board is provided between the two mounting positions; when the guide chute slide is connected to one of the mounting positions of the material receiving cavity, the guide chute slide is used to make the material falling on its surface flow to the first guide chute or the second guide chute connected to the other mounting position.

[0014] In some embodiments, at least one reinforcing support plate is respectively provided on both sides of the middle partition board, and each reinforcing support plate is fixedly connected to one of the side plates.

[0015] The beneficial effects of the micro flour cleaning machine for laboratory provided by the present utility model are as follows: compared with the prior art, in the micro flour cleaning machine for laboratory of the present utility model, the suction hood makes a negative pressure formed inside the two sieve boats, so that the outside air enters the inside of the sieve boats through the first air inlet bend and the second air inlet bend to form an air flow passing through each sieve layer from bottom to top, and thus the material is screened under the combined action of the air flow and the vibration of the sieve boats. By respectively arranging the first air inlet bend and the second air inlet bend on the upper and lower sides of the maintenance door, one more air inlet path can be added compared with the conventional air inlet structure, so as to improve the air inlet efficiency. At the same time, since the first air inlet bend and the second air inlet bend have a downward inclined air inlet angle inside the sieve boats, it can avoid the material from falling into the first air inlet bend and the second air inlet bend and leaking outwards, avoiding waste and affecting the experimental environment. Description of the Drawings

[0016] Figure 1 It is the front view structural schematic diagram of the micro flour cleaning machine for laboratory provided by the embodiment of the present utility model;

[0017] Figure 2 It is the structural schematic diagram of the air inlet and material guiding assembly of the micro flour cleaning machine for laboratory provided by the embodiment of the present utility model;

[0018] Figure 3 It is Figure 2 the cross-sectional structural schematic diagram of;

[0019] Figure 4 It is the three-dimensional structural schematic diagram of the material guiding assembly adopted by the embodiment of the present utility model.

[0020] In the figure: 10, flexible connection base; 20, screening ship; 21, screening layer; 22, sorting mechanism; 221, material guiding plate; 2211, door stop strip; 222, sorting plate; 23, maintenance access door; 24, first air inlet bend; 25, second air inlet bend; 26, upper window frame; 261, first sheet metal; 262, second sheet metal; 27, lower window frame; 271, first inclined surface; 272, second inclined surface; 28, folded surface beam; 281, first folded surface; 282, second folded surface; 283, connecting rod; 30, air suction hood; 40, material guiding assembly; 400, material receiving cavity; 41, material receiving box; 411, middle partition board; 412, side box; 413, side plate; 42, first material guiding groove; 43, second material guiding groove; 44, material guiding slide plate; 45, discharge pipe; 46, partition board; 47, reinforcing support plate. Detailed implementation mode

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] It should be noted that when an element is referred to as being "arranged on" or "connected to" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or several of such features. In the description of the present application, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically defined.

[0023] Please refer to Figures 1 to 4, the micro purifier for laboratory provided by the present utility model will be described below. The micro purifier for laboratory includes a flexible connection seat 10, two sieve boats 20 arranged on the flexible connection seat 10, an air suction hood 30 arranged above the two sieve boats 20, and two feeding assemblies 40 respectively connected to the bottom of each sieve boat 20. Each feeding assembly 40 has two material receiving cavities 400; a plurality of sieve layers 21 are stacked and distributed inside the sieve boat 20, and a sorting mechanism 22 is arranged below the sieve layers 21. The sorting mechanism 22 is used to sort the materials falling from the sieve layers 21 into the two material receiving cavities 400; a maintenance access door 23, a first air inlet bend 24 and a second air inlet bend 25 are arranged at the position of the side wall of the sieve boat 20 aligned with the sorting mechanism 22; wherein, the first air inlet bend 24 and the second air inlet bend 25 are respectively located on the upper and lower sides of the maintenance access door 23, and both form an air inlet angle inclined downward inside the sieve boat 20.

[0024] It should be noted that the micro purifier for laboratory provided in this embodiment can be made by proportionally reducing an existing production purifier, and on this basis, the maintenance window and the air inlet structure arranged on the side of the sieve boat 20 are improved; specifically, the flexible connection seat 10 (which can directly serve as a support for the ground in an array distribution manner, or can be used as a connecting member between the sieve boat and the frame fixed on the ground, aiming to meet the vibration requirements of the sieve boat), the sieve boat 20 (including the vibration motor connected to its outside), the air suction hood 30, and the sorting mechanism 22 are all the same as the existing structures. The feeding assembly 40 is used to connect to the grinding mill unit and convey the undersize materials into the grinding mill unit. Its structure can adopt the existing structure or can be improved to meet the diverse and flexible selection requirements of the laboratory for the discharge position.

[0025] It should be understood that both the first air inlet bend 24 and the second air inlet bend 25 are slit structures, which can avoid the leakage of materials inside the sieve boat 20 due to the too large cross-sectional area of a single air inlet bend. On this basis, the cross-sections of the first air inlet bend 24 and the second air inlet bend 25 are both inverted V-shaped or inverted U-shaped, which can ensure that the air inlet angle is inclined downward when the outside air enters the inside of the sieve boat 20. When the outside air enters the inside of the sieve boat 20 at an inclined downward angle, due to the action of the air suction hood 30 (connected to the negative pressure fan), the pressure in the air chamber at the top of the sieve boat 20 is lower than that at the bottom of the sieve boat 20, so that the outside air turns upward under the negative pressure after entering the inside of the sieve boat 20 at an inclined downward angle. Thus, the air flow passes through each sieve layer from bottom to top in turn; therefore, the first air inlet bend 24 and the second air inlet bend 25 adopting an air inlet angle inclined downward can avoid the leakage of the falling undersize materials to the outside through the first air inlet bend 24 and the second air inlet bend 25.

[0026] The micro purifier for laboratory provided in this embodiment, compared with the prior art, the air suction hood 30 creates a negative pressure inside the two sieve ships 20, so that the outside air enters the inside of the sieve ship 20 through the first air inlet bend 24 and the second air inlet bend 25 to form an air flow that passes through each sieve layer 21 from bottom to top. Thus, under the combined action of the air flow and the vibration of the sieve ship 20, the material is screened. By respectively arranging the first air inlet bend 24 and the second air inlet bend 25 on the upper and lower sides of the maintenance door 23, an additional air inlet path can be added compared with the conventional air inlet structure, thereby improving the air inlet efficiency. At the same time, since the first air inlet bend 24 and the second air inlet bend 25 have a downward-inclined air inlet angle inside the sieve ship 20, it is possible to prevent the material from falling into the first air inlet bend 24 and the second air inlet bend 25 and leaking outwards, avoiding waste and affecting the experimental environment.

[0027] In some embodiments, referring to Figure 1 and Figure 3 , a maintenance window is provided on the side wall of the sieve ship 20. The maintenance window includes an upper window frame 26 and a lower window frame 27; the distribution mechanism 22 includes two guide plates 221 that are spaced apart and the spacing gradually decreases from top to bottom. A first air inlet bend 24 is formed between the upper end of one of the guide plates and the upper window frame 26; a folding beam 28 is arranged at intervals above the lower window frame 27. A second air inlet bend 25 is formed between the folding beam 28 and the lower window frame 27, and the maintenance door 23 is connected between the folding beam 28 and the guide plate 221.

[0028] The distribution mechanism 22 can be understood as two guide plates 221 distributed in an inverted V shape. The lower ends of the two guide plates 221 form a blanking slit. A row of distribution plates 222 with adjustable inclination angles is arranged along the blanking slit. By adjusting the angles of the respective distribution plates 222, the screened material is deflected to both sides and enters the two receiving cavities 400; setting a maintenance window here can adjust the distribution plates 222 after the maintenance door 23 is opened, so as to meet the requirement of adjusting and distributing the feeding amounts in the two receiving cavities 400; on this basis, using the gap between the upper window frame 26 of the maintenance window and the guide plate as the first air inlet bend 24, and arranging a folding beam 28 above the lower window frame 27 to form the second air inlet bend 25, the structure is compact, and the screened material can be blown away from the maintenance door 23 by the air inlets on the upper and lower sides of the maintenance window, thereby preventing material leakage at the position of the maintenance window.

[0029] As a specific implementation manner of the above first air inlet bend 24, please refer to Figure 3, the upper window frame 26 includes a first sheet metal 261 and a second sheet metal 262. The first sheet metal 261 and the second sheet metal 262 are joined to form a first included angle space with the opening facing downward. The upper end of the material guiding plate extends into the first included angle space to form a first air inlet bend 24. The first sheet metal 261 and the second sheet metal 262 form an inverted V-shaped structure. On this basis, the upper end of the material guiding plate extends into the first included angle space formed by the two, so that an obliquely upward slit can be formed between the lower surface of the first sheet metal 261 and the material guiding plate, and an obliquely downward slit can be formed between the upper surface of the second sheet metal 262 and the material guiding plate. Thus, the first air inlet bend 24 forms an inverted V shape and presents an obliquely downward air inlet angle in the screening ship 20. At the same time, the second sheet metal 262 can block the slit opening of the first air inlet bend 24 above the material guiding plate, thereby preventing the screened material from spilling onto the first air inlet bend 24 and further improving the anti-leakage effect.

[0030] In some possible implementation manners, please refer to Figure 3 , the top surface of the lower window frame 27 includes a first inclined surface 271 and a second inclined surface 272 arranged at an included angle. The first inclined surface 271 and the second inclined surface 272 are joined to form a folded angle structure; the folded surface beam 28 includes a first folded surface 281 and a second folded surface 282. The first folded surface 281 and the second folded surface 282 are joined to form a second included angle space with the opening facing downward. The folded angle structure extends into the second included angle space to form a second air inlet bend 25. The inverted V-shaped folded angle structure formed by the first inclined surface 271 and the second inclined surface 272 can cooperate with the folded surface beam 28 to form an inverted V-shaped second air inlet bend 25, so that the second air inlet bend 25 forms an obliquely downward air inlet angle inside the screening ship 20. At the same time, using the folded surface beam 28 to block the lower window frame 27 can prevent the screened material from spilling onto the lower window frame 27 and further improve the anti-leakage effect.

[0031] Specifically, in this embodiment, as Figure 3 shown, a plurality of connecting rods 283 are distributed at intervals on the folded surface beam 28. One end of the connecting rod 283 passes downward through the folded surface beam 28 and is fixedly connected to the lower window frame 27. The other end of the connecting rod 283 extends upward and is hinged to the maintenance flap 23; a door stop strip 2211 is provided on the surface of the material guiding plate 221 facing the folded surface beam 28. One side edge of the maintenance flap 23 overlaps the door stop strip 2211 and forms an inclined closed state.

[0032] By setting the connecting rod 283, on the one hand, the folded surface beam 28 can be fixed above the lower window frame 27 in a suspended manner, and on the other hand, it can serve as the connection foundation for the maintenance door 23. Of course, considering that when making local adjustments to the sorting mechanism 22, it is not necessary to open the maintenance door 23 as a whole, which increases the risk of foreign objects entering the inside of the screening ship 20 and contaminating the materials. Therefore, the maintenance door 23 can be divided into multiple unit doors, and each unit door is respectively hinged to the top ends of two adjacent connecting rods 283, so as to realize the independent opening and closing of each unit door. On this basis, the door stop strip 2211 provided on the lower surface of the material guiding plate 221 is used to overlap the upper ends of each unit door, thereby ensuring the sealing tightness of the maintenance window after each unit door is closed, and presenting an inclined state after the unit door is closed. Since the inside of the screening ship 20 is in a negative pressure state, the unit door does not need to be provided with additional locking parts to maintain a stable closed state, which not only facilitates the opening and closing operations, but also can avoid the situation that the locking parts fall off and enter the screening ship 20, improving the operation stability of the equipment.

[0033] Figure 4 Shown is a specific structural form of the material guiding assembly 40. The material guiding assembly 40 includes a receiving box 41 fixedly connected to the bottom of the screening ship 20, as well as a first material guiding groove 42, a second material guiding groove 43, and a material guiding slide plate 44. Among them, the interior of the receiving box 41 is partitioned into two receiving cavities 400, and two mounting positions are provided at the bottom of each receiving cavity 400, and each mounting position is respectively detachably connected to the first material guiding groove 42 or the second material guiding groove 43 or the material guiding slide plate 44. Considering the diversity of process changes in the laboratory application environment, here the receiving box 41 is used as a fixed module and connected to the screening ship 20, and the first material guiding groove 42, the second material guiding groove 43, and the material guiding slide plate 44 are used as detachable modules that can be flexibly selected according to process requirements and detachably connected to the receiving box 41, thereby improving the adaptability of the equipment to different process requirements.

[0034] Specifically, referring to Figure 4 , the receiving box 41 includes a middle partition plate 411, two side boxes 412, and two side plates 413; the two side boxes 412 are symmetrically connected to both ends of the middle partition plate 411; the two side plates 413 are symmetrically connected to both sides of the middle partition plate 411, and both ends of the side plates 413 are respectively lapped and fixed to the side walls of the two side boxes 412; among them, the upper edges of the two side plates 413 are both connected to the screening ship 20, and the two side plates 413 respectively form receiving cavities 400 with the middle partition plate 411, and both ends of the middle partition plate 411 respectively extend into the two side boxes 412 and partition the internal space of the side boxes 412.

[0035] A material receiving cavity 400 is respectively formed between the middle partition plate 411 and the two side plates 413. At the same time, the interior of the side box 412 is partitioned into spaces corresponding to the two material receiving cavities 400, so that the materials sorted by the sorting mechanism 22 can accurately fall into the two material receiving cavities 400, improving the distribution accuracy of the undersize materials. At the same time, the two side boxes 412 are used to guide the materials at both ends, which is beneficial to reducing the opening length at the lower end of the material receiving cavity 400, thereby reducing the sizes of the first material guiding groove 42, the second material guiding groove and the material guiding slide plate 44, facilitating disassembly, replacement and reducing the manufacturing cost.

[0036] It should be noted that, please refer to Figure 2 , in this embodiment, the bottom of the first material guiding groove 42 is an inclined surface, and the bottom of the second material guiding groove 43 is a V-shaped folding surface. Among them, a discharge pipe 45 is provided at the low end of the inclined surface and the bending part of the V-shaped folding surface. The first material guiding groove 42 with an inclined surface as the bottom can make the discharge pipe 45 located at its end, while the second material guiding groove with a V-shaped folding surface as the bottom can make the discharge pipe 45 located at the middle part thereof. Thus, it is possible to change the position of the discharge pipe 45 by selecting to install the first material guiding groove 42 or the second material guiding groove at each installation position, so as to meet the requirements of the undersize material discharge positions at different locations, and improve the adaptability to different process routes.

[0037] It should be noted that, as Figure 2 and Figure 4 shown, when the first material guiding groove 42 or the second material guiding groove 43 is respectively connected to the two installation positions of the material receiving cavity 400, a partition board 46 is provided between the two installation positions; when the material guiding slide plate 44 is connected to one of the installation positions of the material receiving cavity, the material guiding slide plate 44 is used to make the materials falling on its surface flow to the first material guiding groove 42 or the second material guiding groove 43 connected to the other installation position.

[0038] If two undersize material discharge paths need to be separated from the same material receiving cavity 400, the same material receiving cavity 400 is divided into two cavities by setting a partition board 46, and the corresponding material guiding grooves (it can be one first material guiding groove 42 and one second material guiding groove 43, or both installation positions are installed with the first material guiding groove 42 or the second material guiding groove 43) are respectively installed at the two installation positions. Thus, the undersize materials falling into the material receiving cavity 400 can be accurately distributed into the two material guiding grooves and discharged by the corresponding discharge pipes 45, so as to ensure the accurate distribution of the undersize materials. If the undersize materials falling into the same material receiving cavity 400 need to flow to a single target position, that is, only one discharge pipe 45 needs to be configured for this material receiving cavity 400. At this time, one of the installation positions is connected to the material guiding slide plate 44, and the other installation position is installed with the first material guiding groove 42 or the second material guiding groove 43, so that the undersize materials falling on the material guiding slide plate 44 flow into the material guiding groove during the vibration of the screening ship 20 and are discharged together with the undersize materials falling into the material guiding groove through the same discharge pipe 45.

[0039] To improve the structural strength, please refer to Figure 4 , at least one reinforcing support plate 47 is provided on each side of the middle partition plate 411, and each reinforcing support plate 47 is fixedly connected to one of the side plates 413 respectively.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A micro powder purifier for laboratory use, characterized in that: It comprises a flexible connection seat, two screen boats arranged on the flexible connection seat, an air suction hood arranged above the two screen boats, and two material guide components respectively connected to the bottom of each of the screen boats, each of the material guide components has two material receiving cavities; a plurality of screening layers are stacked and distributed in the screen boat, a distribution mechanism is arranged under the screening layer, and the distribution mechanism is used to distribute the materials dropped from the screening layer into the two material receiving cavities; a maintenance valve, a first air inlet bend and a second air inlet bend are arranged at the position where the side wall of the screen boat is aligned with the distribution mechanism; wherein the first air inlet bend and the second air inlet bend are respectively located on the upper and lower sides of the maintenance valve, and both form an oblique downward air inlet angle inside the screen boat.

2. The laboratory micro powder purifier according to claim 1, characterized in that: The side wall of the screening boat is provided with an inspection window, and the inspection window includes an upper window frame and a lower window frame; the distribution mechanism includes two guide plates which are spaced apart and the spacing gradually decreases from top to bottom, and the first air inlet bend is formed between the upper end of one of the guide plates and the upper window frame; a folding beam is spaced apart above the lower window frame, and the second air inlet bend is formed between the folding beam and the lower window frame, and the inspection valve is connected between the folding beam and the guide plate.

3. The laboratory micro powder purifier as claimed in claim 2, characterized in that: The upper window frame includes a first sheet metal and a second sheet metal. The first sheet metal and the second sheet metal are connected to form a first angle space with an opening facing downward. The upper end of the guide plate extends into the first angle space to form the first air inlet bend.

4. The laboratory micro powder purifier according to claim 2, characterized in that: The top surface of the lower window frame includes a first inclined surface and a second inclined surface set at an angle, and the first inclined surface and the second inclined surface are connected to form an angle structure; the folded surface beam includes a first folded surface and a second folded surface, and the first folded surface and the second folded surface are connected to form a second angle space with an opening facing downward, and the angle structure extends into the second angle space to form the second air inlet bend.

5. The laboratory micro powder purifier as claimed in claim 2, characterized in that: A plurality of connecting rods are spaced apart on the folding surface beam, one end of the connecting rod passes downward through the folding surface beam and is fixedly connected to the lower window frame, and the other end of the connecting rod extends upward and is hinged to the inspection valve; a door stop strip is provided on the surface of the guide plate facing the folding surface beam, and one side edge of the inspection valve overlaps the door stop strip to form an inclined closed state.

6. The laboratory micro powder purifier according to claim 1, characterized in that: The material guiding assembly comprises a material receiving box fixedly connected to the bottom of the screening ship, and a first material guiding trough, a second material guiding trough, and a material guiding slide; wherein, the interior of the material receiving box is divided into two material receiving cavities, and the bottom of each material receiving cavity is provided with two mounting positions, and each mounting position can be detachably connected to the first material guiding trough or the second material guiding trough or the material guiding slide.

7. The laboratory micro powder purifier according to claim 6, characterized in that: The material receiving box includes: a middle partition, two side boxes and two side panels; the two side boxes are symmetrically connected to the two ends of the middle partition; the two side panels are symmetrically connected to the two sides of the middle partition, and the two ends of the side panels are respectively overlapped and fixed to the side walls of the two side boxes; wherein the upper edges of the two side panels are connected to the screening ship, the material receiving cavity is formed between the two side panels and the middle partition, and the two ends of the middle partition extend into the two side boxes respectively and separate the internal space of the side boxes.

8. The laboratory micro powder purifier according to claim 6, characterized in that: The bottom of the first material guiding trough is an inclined surface, and the bottom of the second material guiding trough is a V-shaped folded surface; wherein a discharge pipe is provided at the lower end of the inclined surface and the bending part of the V-shaped folded surface.

9. The laboratory micro powder purifier according to claim 8, characterized in that: When the two mounting positions of the material receiving chamber are respectively connected to the first material guide trough or the second material guide trough, a baffle plate is provided between the two mounting positions; when the material guide slide plate is connected to one of the mounting positions of the material receiving chamber, the material guide slide plate is used to make the material falling onto its surface flow to the first material guide trough or the second material guide trough connected to the other mounting position.

10. The laboratory micro powder purifier according to claim 7, characterized in that: At least one reinforcing support plate is respectively disposed on both sides of the middle partition plate, and each of the reinforcing support plates is respectively fixedly connected to one of the side plates.

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