A raw material screening device for sodium molybdate production

Abstract

The present invention provides a raw material screening device for sodium molybdate production, which belongs to the technical field of screening devices. A raw material screening device for sodium molybdate production includes a top plate, a support plate, a bottom plate, a material storage part, a material guide hopper, a material guide port, a screen frame and a heating unit; the present invention cleverly utilizes the reciprocating movement of the screen frame to realize its own up and down reciprocating movement through the heating unit composed of a heat-conducting shell, a heating chamber, a heating tube, a connecting rod, an L-shaped toggle frame, and a spring. Through this dynamic heating, the heat can be evenly distributed on the raw material, avoiding local overheating, improving the heat exchange efficiency, effectively removing moisture, reducing screen blockage, reducing maintenance costs and downtime, ensuring product quality and smooth operation of the production line, and at the same time, the open and closed states formed by the heat-conducting shell and the material guide port can disperse the material and preheat it, accelerate drying, and make the entire screening and drying process more efficient and energy-saving.

Description

Technical Field

[0001] The invention relates to the technical field of screening devices, in particular to a raw material screening device for sodium molybdate production. Background Art

[0002] Sodium molybdate is an inorganic substance in the form of white rhombus crystals. It is mainly used as a raw material for the manufacture of dyes, molybdenum red pigments, light-fast color precipitants, etc. The raw material required for the production of sodium molybdate is molybdenum concentrate, which needs to be screened using a screening device before use.

[0003] During operation, the current screening device generally guides the raw materials into a reciprocating screen frame structure for screening. However, due to the lack of a heating mechanism, when some wet particles are mixed in the screening raw materials, these wet raw materials are easily adhered to the screen due to the effect of moisture. As time goes by, these adhered raw materials gradually accumulate into lumps or agglomerates, thereby blocking the screen holes, and the blocked screen holes will reduce the effective screening area of ​​the screen, reduce the screening efficiency, and may even affect the quality of the final product and the overall efficiency of the production line. To this end, in response to this problem, the present invention proposes a raw material screening device for sodium molybdate production. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a raw material screening device for sodium molybdate production that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a raw material screening device for sodium molybdate production, comprising a top plate, a pair of vertical support plates are fixed at the bottom of the top plate, a bottom plate is fixed between the bottoms of the two support plates, a material storage piece is arranged above the top of the top plate, a material guide hopper matched with the material storage piece is connected to the bottom of the top plate, a material guide port is arranged below the bottom of the material guide hopper, a reciprocating screen frame is arranged below the material guide port, and a heating unit linked with the screen frame is also included, so that the heating unit passes By utilizing the reciprocating motion of the screen frame, the bottom position of the material guide port can be reciprocated up and down, so as to heat the raw materials entering the screen frame, wherein the heating unit includes a heat-conducting shell arranged at the material guide port, a heating cavity is arranged in the heat-conducting shell, a heating tube is installed between the inner walls of the heating cavity, and a filter is installed at the bottom of the heat-conducting shell. When the heat-conducting shell moves downward, the heat-conducting shell and the material guide port are in an open state, and when the heat-conducting shell moves upward, the heating unit and the material guide port are in a closed state.

[0006] Preferably, the material storage member includes a storage barrel, a feed hopper with a sealing cover is provided on the top of the storage barrel, and a pair of material guide pipes with control valves are provided on the bottom of the storage barrel for passing the raw materials in the storage barrel through the material guide hopper into the screen frame for reciprocating screening.

[0007] Preferably, the inner cavity diameter of the material guide hopper gradually decreases from top to bottom, the outer surface diameter of the heat conductive shell gradually increases from top to bottom, and the bottom diameter of the heat conductive shell is equal to the port diameter of the material guide port.

[0008] Preferably, a push rod 1 is sliding on the support plate located in front of the left side of the screen frame, one end of the push rod 1 is fixed to the screen frame, and a semicircular toggle block is fixed to the other end of the push rod 1, and a squeezing mechanism is linked to the surface of the semicircular toggle block; a push rod 2 is sliding on the support plate located in front of the right side of the screen frame, one end of the push rod 2 is fixed to the screen frame, and a push block is fixed to the other end of the push rod 2, and a connecting tube 1 fixed to the support plate is fitted on the surface of the push block, and a spring 1 is fixed between the side wall of the connecting tube 1 and one side of the push block.

[0009] Preferably, the extrusion mechanism comprises a mounting plate fixed on the support plate, a driving unit is mounted on the mounting plate, and an output end of the driving unit is connected to a cam 1 that fits with the surface of the semicircular toggle block.

[0010] Preferably, one side of the connecting tube one is connected to an air duct, the other end of the air duct is connected to the connecting tube two, a rotating rod is rotatably provided on the connecting tube two, a plurality of circular blades that fit the inner wall of the connecting tube two are fixed on the rotating rod, a cam two is fixed to one end of the rotating rod, and a surface of the cam two is linked to an elastic part connected to the top of the heat-conducting shell.

[0011] Preferably, a pair of fixing frames are fixed to the bottom of the second connecting tube, and the bottom of the fixing frames is fixed to the top of the top plate.

[0012] Preferably, the elastic member includes a connecting rod sliding on the top plate, the bottom end of the connecting rod is fixed on the top of the heat-conducting shell, an L-shaped toggle frame located above the top plate is fixed on the connecting rod, a second spring sleeved on the connecting rod is fixed between the top wall of the L-shaped toggle frame and the top of the top plate, and the bottom of the L-shaped toggle frame is provided with an arc-shaped edge that fits with the second surface of the cam.

[0013] Preferably, the connecting rod is a vertical and square structure.

[0014] Preferably, an air guide groove is connected between the top of the connecting rod and the top wall of the heating chamber, and a connecting hose is provided between the top port of the air guide groove and the top of the second connecting tube.

[0015] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention cleverly utilizes the reciprocating movement of the screen frame to realize its own up and down reciprocating movement through the heating unit composed of a heat-conducting shell, a heating chamber, a heating tube, a connecting rod, an L-shaped toggle frame, and a spring. Through this dynamic heating, the heat can be evenly distributed on the raw material, avoiding local overheating, improving the heat exchange efficiency, effectively removing moisture, reducing screen blockage, reducing maintenance costs and downtime, and ensuring product quality and smooth operation of the production line;

[0016] At the same time, the opening and closing states formed by the heat-conducting shell and the material guide port in the coordinated cooperation of the reciprocating motion of the screen frame can not only disperse the materials to avoid accumulation and reduce the amount of materials directly impacting the screen frame per unit time, but also enable the materials to be heated to a certain extent before entering the screen frame. This preheating treatment not only reduces the heating time of the materials in the screen frame, but also improves the drying efficiency, making the entire screening and drying process more efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A front structural schematic diagram of a raw material screening device for sodium molybdate production provided by the present invention;

[0018] Figure 2 A schematic diagram of a top plate cross-sectional structure of a raw material screening device for sodium molybdate production provided by the present invention;

[0019] Figure 3 For the present invention Figure 2 A schematic diagram of the structure with a partial enlargement at the center;

[0020] Figure 4 A schematic cross-sectional view of the guide hopper of a raw material screening device for sodium molybdate production provided by the present invention;

[0021] Figure 5 A schematic diagram of the top structure of a screen frame of a raw material screening device for sodium molybdate production provided by the present invention;

[0022] Figure 6 A schematic diagram of the bottom structure of a screen frame of a raw material screening device for sodium molybdate production provided by the present invention;

[0023] Figure 7 A schematic diagram of a side view of a connecting cylinder of a raw material screening device for sodium molybdate production provided by the present invention;

[0024] Figure 8The present invention provides a schematic diagram of the cross-sectional structure of the connecting cylinder of a raw material screening device for sodium molybdate production provided by the present invention.

[0025] In the figure: 1, top plate; 11, support plate; 12, bottom plate; 2, material storage; 21, material storage barrel; 22, feed hopper; 23, material guide pipe; 3, material guide hopper; 31, material guide port; 4, screen frame; 41, push rod 1; 42, semicircular toggle block; 43, extrusion mechanism; 431, mounting plate; 432, drive unit; 433, cam 1; 44, push rod 2; 45, push block; 46, connecting barrel 1; 47, spring Spring one; 48, air guide tube; 49, connecting tube two; 410, rotating rod; 411, blade; 412, cam two; 5, heating unit; 51, heat-conducting shell; 52, heating chamber; 53, heating tube; 54, filter; 55, elastic member; 551, connecting rod; 552, L-shaped toggle frame; 553, spring two; 554, arc edge; 555, air guide groove; 556, connecting hose; 56, fixing frame. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0028] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] Reference Figure 1-Figure 8A raw material screening device for sodium molybdate production includes a circular top plate 1. The top plate 1 serves as the upper support structure of the entire screening device. Its stability is crucial to the operation of the entire device. Therefore, a pair of vertical support plates 11 are fixed at the bottom of the top plate 1. The two support plates 11 not only provide additional support for the top plate 1, but also ensure the stability of the device structure. A bottom plate 12 is fixed between the bottoms of the two support plates 11. Since the bottom plate 12 serves as the foundation of the entire device and bears the weight of the screening device, in order to ensure the stability of the device during use, mounting holes are designed at the four corners of the bottom plate 12. Bolts and anchor screws can be used through these mounting holes. The screening device is firmly installed at the desired location, such as the ground, workbench or other supporting structure, by bolts or other fixing devices. At the same time, in order to facilitate the storage of the raw materials to be screened, a storage piece 2 is provided above the top of the top plate 1, and a guide hopper 3 matching the storage piece 2 is connected to the bottom of the top plate 1. A guide port 31 is provided below the bottom of the guide hopper 3, and a reciprocating screen frame 4 is provided below the guide port 31. The top of the screen frame 4 is open, which is convenient for receiving the raw materials from the guide port 31 and allows the operator to clean and maintain the unqualified particles accumulated on the screen frame 4, while the bottom of the screen frame 4 is densely covered with evenly distributed screen holes, and the size of these holes is carefully set according to the screening requirements.

[0030] Among them, on the basis of the above embodiments, refer to Figure 1 The material storage member 2 includes a material storage barrel 21, a feeding hopper 22 with a sealing cover is provided on the top of the material storage barrel 21, and a pair of material guide pipes 23 with control valves are provided at the bottom of the material storage barrel 21. When the control valve on the material guide pipe 23 is opened, the raw materials in the material storage barrel 21 pass through the material guide hopper 3 and the material guide port 31, and finally fall into the screen frame 4. The reciprocating motion of the screen frame 4 causes the raw materials to be efficiently screened on the screen frame 4. Fine particles that meet the requirements fall smoothly through the holes of the screen, while larger particles that do not meet the requirements are retained on the screen. This design not only ensures the screening efficiency, but also greatly improves the screening quality, meeting the strict requirements for raw material screening in the production process of sodium molybdate.

[0031] Reference Figure 1 , Figure 2 and Figure 5A push rod 41 is slidingly arranged on the support plate 11 located in front of the left side of the screen frame 4, one end of the push rod 41 is fixed on the screen frame 4, and a semicircular toggle block 42 is fixed on the other end of the push rod 41, and an extrusion mechanism 43 is linked to the surface of the semicircular toggle block 42, and a push rod 2 44 is slidingly arranged on the support plate 11 located in front of the right side of the screen frame 4, one end of the push rod 2 44 is fixed on the screen frame 4, and a push block 45 is fixed on the other end of the push rod 2 44, and a connecting tube 46 fixed on the support plate 11 is fitted on the surface of the push block 45, and a spring 47 is fixed between the side wall of the connecting tube 46 and one side of the push block 45, and the extrusion mechanism 43 includes a mounting plate 431 fixed on the support plate 11, a driving part 432 is mounted on the mounting plate 431, and the output end of the driving part 432 is connected with a cam 433 fitted with the surface of the semicircular toggle block 42.

[0032] According to the above technical scheme, when the screen frame 4 performs reciprocating motion, the driving part 432 using the servo motor is started to drive the cam 433 to rotate. Since the cam 433 has a tip and an arc end, during the rotation of the cam 433, the tip and the arc end of the cam 433 will repeatedly squeeze the semicircular toggle block 42. Under the squeezing action, the semicircular toggle block 42 will drive the push rod 2 44 connected to the other side of the screen frame 4 through the push rod 1 41 to drive the push block 45 to repeatedly slide along the inner wall of the connecting tube 1 46 to squeeze the spring 1 47. Under the elastic reset of the spring 1 47, the screen frame 4 can perform horizontal reciprocating motion left and right between the two support plates 11. When the raw material falls from the material guide port 31 onto the screen frame 4, the reciprocating motion of the screen frame 4 will prompt the raw material to be efficiently screened on the screen frame 4.

[0033] In a preferred embodiment, refer to 2- Figure 8 Considering that some wet particles are mixed in the screening raw materials, they are easy to adhere to the holes of the screen due to the effect of moisture, which will cause these adhered raw materials to gradually accumulate into lumps or agglomerates, thereby blocking the holes of the screen and reducing the screening efficiency. Therefore, based on this, on the basis of the above embodiment, a heating unit 5 is also included that is linked with the screen frame 4, so that the heating unit 5 can reciprocate up and down at the bottom position of the material guide port 31 by utilizing the reciprocating motion of the screen frame 4, thereby heating the raw materials entering the screen frame 4, wherein the heating unit The heat-conducting shell 51 includes a heat-conducting shell 51 disposed at the material guide port 31, a heating chamber 52 is disposed in the heat-conducting shell 51, a heating pipe 53 is installed between the inner walls of the heating chamber 52, and a filter screen 54 is installed at the bottom of the heat-conducting shell 51. When working, the heating pipe 53 is activated to allow the hot gas generated in the heating chamber 52 to pass through the filter screen 54 to heat the screen frame 4 and the material therein that are reciprocating left and right below. This design is intended to reduce the moisture content of the raw materials and effectively prevent the raw materials from agglomerating due to moisture, thereby blocking the screen holes at the bottom of the screen frame 4, thereby improving the screening efficiency.

[0034] It is worth mentioning that in the optimization of the above technical solution, the heating unit 5 cleverly utilizes the reciprocating movement of the screen frame 4 between the two support plates 11 to achieve its own reciprocating movement up and down above the screen frame 4. Through this dynamic heating method, the heat can be more evenly distributed on the raw material, avoiding the problem of local overheating of the raw material that may be caused by traditional static heating. This not only protects the original properties of the raw material, but also effectively prevents thermal damage caused by overheating, ensuring product quality. At the same time, with the reciprocating movement of the screen frame 4 and the heating unit 5, the hot air can more effectively penetrate the raw material layer, reduce thermal resistance, and allow heat energy to penetrate more evenly into the raw material. This dynamic process allows heat energy to penetrate more evenly into the raw material. Compared with the traditional static heating method, the heat exchange efficiency is greatly improved. In this way, not only the excess moisture in the raw material is effectively removed, the risk of wet particles adhering to the screen is reduced, and the raw material is easier to pass through the screen holes during the screening process, effectively avoiding the problem of blockage of the screen holes, but also reducing the maintenance cost of the screen holes and the downtime of the production line.

[0035] In a specific embodiment, referring to Figure 7 and Figure 8 One side of the connecting tube 1 46 is connected to an air guide tube 48, and the other end of the air guide tube 48 is connected to a connecting tube 2 49. A pair of fixing frames 56 are fixed to the bottom of the connecting tube 2 49, and the bottom of the fixing frame 56 is fixed to the top of the top plate 1. A rotating rod 410 is rotatably provided on the connecting tube 2 49, and a plurality of blades 411 that are circular and fit with the inner wall of the connecting tube 2 49 are fixed to the rotating rod 410. A cam 2 412 is fixed to one end of the rotating rod 410, and the surface of the cam 2 412 is linked with The elastic member 55 connected to the top of the heat-conducting shell 51 includes a connecting rod 551 sliding on the top plate 1, the bottom end of the connecting rod 551 is fixed on the top of the heat-conducting shell 51, an L-shaped toggle frame 552 located above the top plate 1 is fixed on the connecting rod 551, a spring 2 553 sleeved on the connecting rod 551 is fixed between the top wall of the L-shaped toggle frame 552 and the top of the top plate 1, and the bottom of the L-shaped toggle frame 552 is provided with an arc-shaped edge 554 that fits with the surface of the cam 2 412.

[0036] For the above technical solution, the up and down reciprocating motion of the heating unit 5 is cleverly combined with the continuous reciprocating motion of the screen frame 4. When working, by utilizing the continuous reciprocating motion of the screen frame 4, the push block 45 will also continuously squeeze and release the spring 1 47, thereby driving the gas inside the connecting tube 1 46 to continuously flow into the connecting tube 2 49 through the air guide pipe 48, and maintain the continuous rotation of the blade 411 and the cam 2 412. In this way, the arcuate edge 554 will continuously overcome the resistance of the spring 2 553 and move up and down under the push of the cam 2 412, thereby driving the heat-conducting shell 51 to perform the same reciprocating motion above the screen frame 4, providing strong support for the uniform heating and efficient screening of the raw materials.

[0037] For the above technical solution, further, when the heat-conducting shell 51 moves downward, the heat-conducting shell 51 and the material guide port 31 are in an open state, and when the heat-conducting shell 51 moves upward, the heating unit 5 and the material guide port 31 are in a closed state. The inner cavity diameter of the material guide hopper 3 gradually decreases from top to bottom, and the outer surface diameter of the heat-conducting shell 51 gradually increases from top to bottom. The bottom diameter of the heat-conducting shell 51 is equal to the port diameter of the material guide port 31.

[0038] Specifically, when the heat-conducting shell 51 moves downward, the open state formed between the heat-conducting shell 51 and the material guide port 31 helps the material to slide down along the gradually increasing outer surface of the heat-conducting shell 51 after falling from the material guide port 31. In this process, the material will not only be dispersed, but also the amount of material directly impacting the screen frame 4 per unit time will be reduced. Since the inner cavity diameter of the material guide hopper 3 gradually decreases from top to bottom, it helps the material to gradually gather and accelerate during the falling process. However, when reaching the material guide port 31, due to the ingenious guidance of the heat-conducting shell 51, the material does not directly rush to a certain position of the screen frame 4, but is evenly distributed. In summary, this design not only utilizes the natural acceleration effect of the material when it falls, but also avoids local accumulation of the material through the guidance of the heat-conducting shell 51. When the heat-conducting shell 51 moves upward, the closed state formed between the heat-conducting shell 51 and the material guide port 31 creates a short enclosed space, which provides a preheating environment for the material. Through the heated surface of the heat-conducting shell 51, the material can be heated to a certain extent before entering the screen frame 4. This preheating treatment not only reduces the heating time of the material in the screen frame 4, but also improves the drying efficiency, making the entire screening and drying process more efficient and energy-saving.

[0039] In a preferred embodiment, referring to Figure 3 and Figure 7 The connecting rod 551 is a vertical and square structure. An air guide groove 555 is connected between the top of the connecting rod 551 and the top wall of the heating chamber 52. A connecting hose 556 is provided between the top end of the air guide groove 555 and the top of the connecting tube 49.

[0040] In the above technical solution, when the blade 411 rotates along the inner wall of the connecting tube 49, the gas discharged from the connecting tube 49 can be blown into the heating chamber 52 through the cooperation of the connecting hose 556 and the air guide groove 555. This design is conducive to improving the air flow speed inside the heating chamber 52, thereby promoting the circulation and heating efficiency of the hot air in the heating chamber 52. As the hot air is quickly and evenly heated to the required temperature, it can be ejected from the heating chamber 52 at a higher flow rate and a wider coverage area, thereby achieving more efficient and uniform heating or drying of the material.

[0041] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A raw material screening device for sodium molybdate production, comprising: A top plate (1), a pair of vertical support plates (11) are fixed at the bottom of the top plate (1), a bottom plate (12) is fixed between the bottoms of the two support plates (11), a material storage member (2) is provided above the top of the top plate (1), a material guide hopper (3) matched with the material storage member (2) is connected to the bottom of the top plate (1), a material guide port (31) is provided below the bottom of the material guide hopper (3), and a reciprocating screen frame (4) is provided below the material guide port (31), characterized in that: Also includes: A heating unit (5) is provided which is linked to the screen frame (4), so that the heating unit (5) can reciprocate up and down at the bottom of the material guide port (31) by utilizing the reciprocating motion of the screen frame (4), thereby heating the raw materials entering the screen frame (4); The heating unit (5) comprises a heat-conducting shell (51) arranged at the material guide port (31), a heating chamber (52) being arranged in the heat-conducting shell (51), a heating tube (53) being installed between the inner walls of the heating chamber (52), a filter screen (54) being installed at the bottom of the heat-conducting shell (51), when the heat-conducting shell (51) moves downward, the heat-conducting shell (51) and the material guide port (31) are in an open state, and when the heat-conducting shell (51) moves upward, the heating unit (5) and the material guide port (31) are in a closed state, the inner chamber diameter of the material guide hopper (3) gradually decreases from top to bottom, the outer surface diameter of the heat-conducting shell (51) gradually increases from top to bottom, and the bottom diameter of the heat-conducting shell (51) is equal to the port diameter of the material guide port (31).

2. A raw material screening device for sodium molybdate production according to claim 1, characterized in that: The material storage member (2) comprises a material storage barrel (21), the top of the material storage barrel (21) is provided with a feed hopper (22) with a sealing cover, and the bottom of the material storage barrel (21) is provided with a pair of material guide pipes (23) with control valves, which are used to pass the raw materials in the material storage barrel (21) through the material guide hopper (3) into the screen frame (4) for reciprocating screening.

3. A raw material screening device for sodium molybdate production according to claim 1, characterized in that: A push rod 1 (41) is slidably mounted on a support plate (11) located near the left front side of the screen frame (4), one end of the push rod 1 (41) is fixed to the screen frame (4), a semicircular toggle block (42) is fixed to the other end of the push rod 1 (41), and a squeezing mechanism (43) is linked to the surface of the semicircular toggle block (42). A push rod 2 (44) is slidably mounted on a support plate (11) located near the right front side of the screen frame (4), one end of the push rod 2 (44) is fixed to the screen frame (4), a push block (45) is fixed to the other end of the push rod 2 (44), a connecting tube 1 (46) fixed to the support plate (11) is attached to the surface of the pushing block (45), and a spring 1 (47) is fixed between the side wall of the connecting tube 1 (46) and one side of the pushing block (45).

4. A raw material screening device for sodium molybdate production according to claim 3, characterized in that: The extrusion mechanism (43) comprises a mounting plate (431) fixed on the support plate (11), a driving unit (432) being mounted on the mounting plate (431), and an output end of the driving unit (432) being connected to a cam 1 (433) that is in contact with the surface of the semicircular toggle block (42).

5. A raw material screening device for sodium molybdate production according to claim 3, characterized in that: One side of the connecting tube 1 (46) is connected to an air guide tube (48), and the other end of the air guide tube (48) is connected to the connecting tube 2 (49). A rotating rod (410) is rotatably provided on the connecting tube 2 (49), and a plurality of circular blades (411) that are in contact with the inner wall of the connecting tube 2 (49) are fixed to the rotating rod (410). A cam 2 (412) is fixed to one end of the rotating rod (410), and a surface of the cam 2 (412) is linked to an elastic member (55) that is connected to the top of the heat-conducting shell (51).

6. A raw material screening device for sodium molybdate production according to claim 5, characterized in that: A pair of fixing frames (56) are fixed to the bottom of the second connecting tube (49), and the bottom of the fixing frames (56) is fixed to the top of the top plate (1).

7. A raw material screening device for sodium molybdate production according to claim 5, characterized in that: The elastic member (55) comprises a connecting rod (551) sliding on the top plate (1), the bottom end of the connecting rod (551) being fixed on the top of the heat-conducting shell (51), an L-shaped toggle frame (552) located above the top plate (1) being fixed on the connecting rod (551), a second spring (553) sleeved on the connecting rod (551) being fixed between the top wall of the L-shaped toggle frame (552) and the top of the top plate (1), and an arc-shaped edge (554) being fitted with the surface of the second cam (412) being provided at the bottom of the L-shaped toggle frame (552).

8. A raw material screening device for sodium molybdate production according to claim 7, characterized in that: The connecting rod (551) is a vertical and square structure.

9. A raw material screening device for sodium molybdate production according to claim 7, characterized in that: An air guide groove (555) is connected between the top of the connecting rod (551) and the top wall of the heating chamber (52), and a connecting hose (556) is provided between the top end of the air guide groove (555) and the top of the second connecting tube (49).

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