An electric constant temperature drying oven for chemical testing

Abstract

The present invention belongs to the technical field of drying ovens, and provides an electric constant temperature drying oven for chemical testing, comprising a box body, an opening is arranged on one side of the box body, and a box door is hinged on the opening side of the box body, an air intake pump is fixedly installed on the bottom surface of the box body, the air intake pump is connected with the outside, and an exhaust pipe is connected with the top of the box body; a fixing rod is fixedly installed on the bottom surface of the box body, a mounting pipe is fixedly installed on the top of the fixing rod through a support plate, and a bracket is rotatably installed on the mounting pipe, so as to solve the technical problems in the prior art that the surface of the material is blocked, resulting in uneven drying of the material and poor drying effect. The present invention supports the material by a first support plate and a second support plate, and the first support plate and the second support plate are spaced apart, so that most of the bottom surface of the material is in an exposed state, and the hot air can contact with most of the bottom surface of the material for drying when moving upward, and the present invention can be widely used in material drying operation scenarios.

Description

Technical Field

[0001] The invention belongs to the technical field of drying ovens, and in particular relates to an electric heating constant temperature drying oven used for chemical testing. Background Art

[0002] Enterprises in the chemical industry mainly increase the value of raw materials by processing them through physical or chemical methods such as mixing, separation, crushing, and heating. Chemical materials need to be tested after production. In the testing process, electric constant temperature drying ovens are indispensable equipment. Chemical materials are dried through electric constant temperature drying ovens.

[0003] However, current chemical materials are directly placed inside the drying box, and multiple sides of the chemical materials cannot be dried simultaneously. In addition, the air inlet head is also fixed, which makes it inconvenient to dry the chemical materials evenly. In response to the above technical problems, an invention application with publication number CN114838571A is disclosed. When in use, the chemical materials are placed on a placement plate, and a drive motor is started to make the turntable, the movable plate and the placement plate rotate synchronously, so that multiple sides of the chemical materials can be dried simultaneously. However, the bottom surface of the material is always in contact with the placement plate, and the bottom surface of the material is always blocked by the placement plate, so that the hot air cannot directly contact and dry the bottom surface of the material, and the drying speed of the bottom surface of the material will be slower than the drying speed of other surfaces of the material, resulting in uneven drying of the material and poor drying effect. Summary of the invention

[0004] The purpose of the present invention is to provide an electric constant temperature drying oven for chemical testing, aiming to solve the technical problems in the prior art that the material surface is blocked, resulting in uneven drying of the material and poor drying effect.

[0005] The present invention is implemented as follows: an electric constant temperature drying box for chemical testing comprises a box body, an opening is arranged on one side of the box body and a box door is hingedly connected to the opening side of the box body, an air intake pump is fixedly installed on the bottom surface of the box body, the air intake pump is connected to the outside, and an exhaust pipe is connected to the top of the box body;

[0006] A fixing rod is fixedly installed at the bottom of the box body, a mounting tube is fixedly installed on the top of the fixing rod through a support plate, a bracket is rotatably installed on the mounting tube, a mounting ring is fixedly installed on the bracket, and multiple groups of first support plates are fixedly installed on the mounting ring; a support rod coaxially arranged with the mounting tube and passing through the mounting tube is provided in the box body, a telescopic part driving the support rod to move up and down is fixedly installed at the bottom of the box body, a cross plate is fixedly installed on the top of the support rod, multiple groups of second support plates are fixedly installed on the cross plate, and multiple groups of heating tubes are fixedly installed at the bottom of the box body.

[0007] Further technical solution: A temperature sensor for detecting the air temperature in the box is fixedly installed in the box, and two groups of fans distributed at intervals are fixedly installed in the box, and the blowing direction of the fans points to the area where the materials are located.

[0008] Further technical solution: the first support plates are distributed along the radial direction of the mounting ring and a gap is set between one end of the first support plate located inside the mounting ring and the center of the mounting ring.

[0009] Further technical solution: multiple groups of the second support plates have different lengths and are distributed in parallel, the rotational coverage area of ​​the second support plates is circular, and a gap is provided between the rotational coverage circular area of ​​the second support plates and the end of the first support plates.

[0010] Further technical solution: A connector is fixedly installed at the output end of the telescopic member, and the connector is rotatably connected to the support rod.

[0011] Further technical solution: A limiting cylinder is fixedly installed on the mounting ring, the limiting cylinder extends to the bottom surface of the box body and a gap is provided between the lower end of the limiting cylinder and the bottom surface of the box body, and the heating tube is located in the limiting cylinder.

[0012] Further technical solution: a rotating power part is fixedly installed on the inner bottom surface of the box body, a first gear is fixedly installed on the end of the output shaft of the rotating power part, the first gear is meshed with a second gear arranged on a fixed rod, a vertical pipe is rotatably installed on the fixed rod, the second gear is fixedly installed on the vertical pipe, a third gear is fixedly installed on the vertical pipe, the third gear is meshed with a first gear ring fixedly installed on the bracket, and the first gear ring is coaxially arranged with the mounting tube.

[0013] Further technical solution: a first iron cylinder is rotatably installed at the lower end of the mounting tube, a second gear ring is fixedly installed on the outer side of the first iron cylinder, the second gear ring is meshed with the first gear, and a plurality of groups of first magnet blocks distributed in a circular array around the support rod are fixedly installed on the support rod, and when the support rod moves upward, the end of the first magnet block slides in contact with the inner wall of the first iron cylinder.

[0014] Further technical solution: A second iron cylinder is fixedly installed on the bracket, and multiple groups of second magnet blocks distributed in a circular array around the support rod are fixedly installed on the support rod. When the support rod moves upward, the end of the second magnet block slides in contact with the inner wall of the second iron cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The material is supported by the first support plate and the second support plate. Due to the interval between the first support plate and the second support plate, most of the bottom surface of the material is exposed. When the hot air moves upward, it can contact with most of the bottom surface of the material for drying, thereby reducing the area of ​​the bottom surface of the material that is blocked, improving the uniformity of material drying, and ensuring the drying effect of the material. At the same time, the fan blows the hot air to one side of the material, so that the hot air flows, so that the hot air away from the material area can move to one side of the material and contact with the material, increasing the contact probability between the hot air and the material, and improving the drying efficiency.

[0017] 2. The first support plate and the second support plate are used to set the time for supporting the material respectively and to carry out reciprocating replacement of the support. Since the support rod rotates at different speeds driven by the first magnet block and the second magnet block, a speed difference will be generated between the first support plate and the second support plate during each replacement of the support. Therefore, each time the first support plate and the second support plate support the material, the position is different from the previous support position, so that each position of the bottom surface of the material can fully contact with the hot air, further improving the uniformity of material drying and improving the drying effect.

[0018] 3. By setting the first magnet block and the second magnet block, the rotation speeds of the two are the same each time the supporting surface of the second support plate is flush with the supporting surface of the first support plate, ensuring that the first support plate, the second support plate and the material remain relatively still, achieving stable replacement of the material support components, further improving the stability of material placement and drying, and avoiding wear on the material when the first support plate and the second support plate are replaced.

[0019] 4. By setting the transmission ratio of the first gear, the second gear, the third gear, the first gear ring and the second gear ring, the rotation speed of the bracket is close to the rotation speed of the first iron cylinder, thereby avoiding large shaking when the rotation speed of the second support plate changes, ensuring the stable placement of the material on the second support plate, and further improving the stability of the drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure inside the box body of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the first supporting plate in the present invention.

[0023] Figure 4 It is a schematic structural diagram of the second supporting plate in the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the installation pipe in the present invention.

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the installation tube in the present invention.

[0026] Figure 7 for Figure 6 A magnified schematic diagram of area A in the middle.

[0027] In the attached drawings: 1. box body; 2. box door; 3. air intake pump; 4. exhaust pipe; 5. temperature sensor; 6. fixing rod; 7. support plate; 8. mounting tube; 9. bracket; 10. mounting ring; 11. first supporting plate; 12. telescopic member; 13. connector; 14. supporting rod; 15. horizontal plate; 16. second supporting plate; 17. rotating power member; 18. first gear; 19. second gear; 20. third gear; 21. first gear ring; 22. first iron cylinder; 23. second gear ring; 24. first magnet block; 25. second iron cylinder; 26. second magnet block; 27. fan; 28. limiting cylinder; 29. ​​heating tube; 30. vertical tube. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0030] like Figure 1-Figure 7 As shown, an electric constant temperature drying oven for chemical testing provided by the present invention comprises a box body 1, an opening is provided on one side of the box body 1 and a box door 2 is hingedly connected to the opening side of the box body 1, an air intake pump 3 is fixedly installed on the bottom surface of the box body 1, the air intake pump 3 is connected to the outside, an exhaust pipe 4 is connected to the top of the box body 1, a temperature sensor 5 for detecting the air temperature in the box body 1 is fixedly installed in the box body 1, and two groups of fans 27 distributed at intervals are fixedly installed in the box body 1, and the blowing direction of the fan 27 is directed to the area where the material is located;

[0031] A fixing rod 6 is fixedly installed at the bottom of the box body 1, and a mounting tube 8 is fixedly installed on the top of the fixing rod 6 through a support plate 7. A bracket 9 is rotatably installed on the mounting tube 8, and a mounting ring 10 is fixedly installed on the bracket 9. A plurality of first support plates 11 are fixedly installed on the mounting ring 10, and the first support plates 11 are distributed along the radial direction of the mounting ring 10, and one end of the first support plate 11 located in the mounting ring 10 is spaced from the center of the mounting ring 10. A support rod 14 is arranged coaxially with the mounting tube 8 and passes through the mounting tube 8 in the box body 1. A telescopic member 12 is provided for driving a support rod 14 to move up and down, a connector 13 is fixedly installed at the output end of the telescopic member 12, the connector 13 is rotatably connected to the support rod 14, a transverse plate 15 is fixedly installed at the top of the support rod 14, a plurality of groups of second support plates 16 are fixedly installed on the transverse plate 15, the plurality of groups of second support plates 16 have different lengths and are distributed in parallel, the rotational coverage area of ​​the second support plates 16 is circular, a gap is provided between the rotational coverage area of ​​the second support plates 16 and the end of the first support plate 11, a plurality of groups of heating tubes 29 are fixedly installed at the bottom of the box body 1.

[0032] In actual application of this embodiment, the box door 2 is opened, and the material to be dried is placed on the first support plate 11 and the second support plate 16 for support and the position of the material is centered. Then, the box door 2 is closed, and the drying temperature can be set through the operation interface to start drying. During drying, the air below the first support plate 11 in the box body 1 is heated by the heating tube 29. After the air is heated, it moves upward to contact the material for drying. The temperature in the box body 1 is detected by the temperature sensor 5 to ensure that the material is dried at a suitable temperature. The filtered air from the outside is transported into the box body 1 through the air intake pump 3, and the gas generated by drying is discharged to the external gas treatment equipment through the exhaust pipe 4 to avoid the escape of toxic gas generated during the drying process.

[0033] Due to the interval between the first support plate 11 and the second support plate 16, most of the bottom surface of the material is exposed. When the hot air moves upward, it can contact most of the bottom surface of the material for drying, thereby reducing the area of ​​the bottom surface of the material that is blocked, improving the uniformity of material drying, and ensuring the drying effect of the material. At the same time, the fan 27 blows the hot air to one side of the material to make the hot air flow, so that the hot air away from the material area can move to one side of the material and contact the material, increasing the contact probability between the hot air and the material and improving the drying efficiency. After drying, open the box door 2 to remove the material.

[0034] like Figure 2 As shown, an electric constant temperature drying box for chemical testing provided by the present invention is provided. A limiting cylinder 28 is fixedly installed on the mounting ring 10. The limiting cylinder 28 extends to the bottom surface of the box body 1 and a gap is set between the lower end of the limiting cylinder 28 and the bottom surface of the box body 1. The heating tube 29 is located in the limiting cylinder 28.

[0035] In actual application of this embodiment, the heating tube 29 is located in the limiting cylinder 28 to heat the air. Due to the existence of the limiting cylinder 28, the air can only move upward and away from the limiting cylinder 28 after being heated, so that the heated hot air all moves to the position where the material is located. The hot air can gather and contact with the material above for drying, thereby improving the heat concentration effect and the material drying effect. Cold air can be supplemented into the limiting cylinder 28 from the gap between the lower end of the limiting cylinder 28 and the bottom surface of the box body 1.

[0036] like Figure 3-Figure 7 As shown, an electric constant temperature drying oven for chemical testing provided by the present invention is provided, wherein a rotating power part 17 is fixedly installed on the inner bottom surface of the box body 1, and a first gear 18 is fixedly installed on the end of the output shaft of the rotating power part 17, and the first gear 18 is meshed with a second gear 19 arranged on the fixed rod 6, and a vertical pipe 30 is rotatably installed on the fixed rod 6, and the second gear 19 is fixedly installed on the vertical pipe 30, and a third gear 20 is fixedly installed on the vertical pipe 30, and the third gear 20 is meshed with a first gear ring 21 fixedly installed on the bracket 9, and the first gear ring 21 is coaxially arranged with the mounting pipe 8.

[0037] Specifically, a first iron cylinder 22 is rotatably installed at the lower end of the mounting tube 8, a second gear ring 23 is fixedly installed on the outer side of the first iron cylinder 22, the second gear ring 23 is meshed with the first gear 18, and a plurality of groups of first magnet blocks 24 distributed in a circular array around the support rod 14 are fixedly installed on the support rod 14. When the support rod 14 moves upward, the end of the first magnet block 24 slides in contact with the inner wall of the first iron cylinder 22.

[0038] Specifically, a second iron cylinder 25 is fixedly mounted on the bracket 9 , and a plurality of second magnet blocks 26 distributed in a circular array around the support rod 14 are fixedly mounted on the support rod 14 . When the support rod 14 moves upward, the ends of the second magnet blocks 26 slide in contact with the inner wall of the second iron cylinder 25 .

[0039] In actual application of this embodiment, in the initial state, the support plane heights of the first support plate 11 and the second support plate 16 are the same, at this time the second magnet block 26 is located in the second iron cylinder 25, the second magnet block 26 absorbs the second iron cylinder 25, the first magnet block 24 does not contact the first iron cylinder 22, the rotating power part 17 drives the vertical tube 30 to rotate through the meshing first gear 18 and the second gear 19, the vertical tube 30 drives the bracket 9 to rotate synchronously through the meshing third gear 20 and the first gear ring 21, and then the bracket 9 can drive the materials located on the first support plate 11 and the second support plate 16 to rotate slowly, because at this time the second magnet block 26 is located in the second iron cylinder 25, the second magnet block 26 absorbs the second iron cylinder 25, and under the action of the magnetic force, the second magnet block 26 absorbs the second iron cylinder 25, when When the second iron cylinder 25 rotates, under the action of magnetic force, the second iron cylinder 25 will apply a force perpendicular to the second magnet block 26 to the end of the second magnet block 26, and the force is unequally perpendicular to the axis of the support shaft 14, and then the force will generate a torque on the support shaft 14 through the second magnet block 26, and under the action of the torque, the support shaft 14 rotates. Since the rotation speed of the bracket 9 is relatively slow, and the magnetic force of the second magnet block 26 adsorbing the second iron cylinder 25 can make the second magnet block 26 completely adsorbed and fixed on the second iron cylinder 25, the support rod 14 can rotate synchronously with the bracket 9, ensuring that the first support plate 11 and the second support plate 16 are in a synchronous rotation state, and the material is evenly in contact with the hot air during the rotation process, which accelerates the drying of the material and improves the drying effect of the material;

[0040] After the first support plate 11 and the second support plate 16 rotate synchronously for a set period of time, the telescopic member 12 extends and drives the support rod 14 to move upward. At this time, the second magnet block 26 is located in the second iron cylinder 25 and slides upward. During the upward movement of the second magnet block 26, it is pushed by the telescopic member 12 in the vertical direction. Since the position of the second iron cylinder 25 is fixed, the second magnet block 26 will produce a relative displacement in the vertical direction with the second iron cylinder 25, but the force on the second magnet block 26 in the horizontal direction remains unchanged. Therefore, the second iron cylinder 25 can still drive the support rod 14 to rotate through the second magnet block 26. According to the knowledge of physics, the upward thrust on the second magnet block 26 will not interfere with its horizontal movement. The second support plate 16 will push the material to move upward, so that the material is no longer in contact with the first support plate 11. At this time, the hot air can contact and dry the material except for the area blocked by the second support plate 16.

[0041] When the second magnet block 26 leaves the second iron cylinder 25, the first magnet block 24 begins to enter the first iron cylinder 22, and the support rod 14 continues to rise, so that the first magnet block 24 enters the first iron cylinder 22, and the rotating power member 17 drives the first iron cylinder 22 to rotate through the first gear 18 and the second gear ring 23. The first magnet block 24 absorbs the first iron cylinder 22, so that the support rod 14 continues to rotate and the rotation speed is the same as the rotation speed of the first iron cylinder 22. The rotation direction of the first iron cylinder 22 is the same as the rotation direction of the bracket 9. The transmission ratio of the first gear 18, the second gear 19, the third gear 20, the first gear ring 21 and the second gear ring 23 is set, so that the rotation speed of the bracket 9 is close to the rotation speed of the first iron cylinder 22, thereby avoiding large shaking when the rotation speed of the second support plate 16 changes, ensuring the stable placement of the material on the second support plate 16, and improving the stability during the drying process;

[0042] When the material is not in contact with the first support plate 11 after a set period of drying, the telescopic member 12 contracts and drives the support rod 14 to move downward. During the downward movement of the support rod 14, the first magnet block 24 first disengages from the first iron cylinder 22, and then the second magnet block 26 enters the second iron cylinder 25. At this time, the rotation speed of the support rod 14 is synchronized with the bracket 9 again, and the support rod 14 continues to descend to make the material contact with the first support plate 11 again. Since the rotation speed of the material will be different from the previous rotation speed after being driven upward by the second support plate 16, the contact position of the first support plate 11 and the material will produce relative movement, and the subsequent position where the first support plate 11 contacts the material again is different from the initial contact position, which avoids the first support plate 11 supporting the material by a fixed position, so that the position of the material is changed each time it is supported, and the shielding position of the first support plate 11 on the material is changed, thereby further improving the uniformity of material drying and improving the drying effect;

[0043] After the material contacts the first support plate 11, the support rod 14 continues to descend. At this time, the second support plate 16 no longer contacts the material. At this time, the hot air can contact and dry the area on the material except for the area blocked by the first support plate 11. The support rod 14 continues to descend until the second magnet block 26 leaves the second iron cylinder 25. At this time, the support rod 14 is no longer subjected to the force of rotation, and its rotation speed will gradually slow down. After the set time has passed again, the telescopic member 12 drives the support rod 14 to move upward again. First, the second magnet block 26 enters the second iron cylinder 25 again and keeps the support rod 14 and the bracket 9 rotating synchronously. Then, the second support plate 16 pushes the material to move upward. Since the rotation speed of the support rod 14 has changed, the position where the second support plate 16 contacts the material each time thereafter is different, which avoids the second support plate 16 supporting the material through a fixed position, so that the position of the material is changed each time, and the shielding position of the second support plate 16 on the material is changed, so as to further improve the uniformity of material drying and improve the drying effect.

[0044] By repeating the above steps, the first support plate 11 and the second support plate 16 can respectively set the time for supporting the material and reciprocately replace the support. Since the support rod 14 rotates at different speeds driven by the first magnet block 24 and the second magnet block 26, the first support plate 11 and the second support plate 16 will have a speed difference during each replacement of the support, and then the first support plate 11 and the second support plate 16 will support the material at a different position than the previous support each time, so that each position of the bottom surface of the material can be fully in contact with the hot air, thereby improving the uniformity of material drying and improving the drying effect. At the same time, through the arrangement of the first magnet block 24 and the second magnet block 26, the rotation speed of the two is the same when the supporting surface of the second support plate 16 is flush with the supporting surface of the first support plate 11 each time, ensuring that the first support plate 11, the second support plate 16 and the material remain relatively still, realizing stable replacement of the material support component, further improving the stability of material placement and drying, and avoiding wear of the material by the first support plate 11 and the second support plate 16 when replacing the support.

[0045] In one embodiment of the present invention, the rotating power part 17 is a motor, and of course it can also be other parts that can output rotating power, such as a hydraulic motor. The motor drives the first support plate 11 and the second support plate 16 to rotate. The telescopic part 12 is an electric telescopic rod, and of course it can also be other parts that can actively change the length, such as a hydraulic cylinder. The electric telescopic rod drives the support rod 14 to move up and down. The first magnet block 24 and the second magnet block 26 are both high-temperature magnets, thereby ensuring that the magnetic force generated by the first magnet block 24 and the second magnet block 26 during the high-temperature drying process will not attenuate, thereby ensuring the stable rotation of the support rod 14.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric constant temperature drying oven for chemical testing, comprising a box body (1), an opening being arranged on one side of the box body (1) and a door (2) being hingedly connected to the opening side of the box body (1), characterized in that: An air intake pump (3) is fixedly mounted on the inner bottom surface of the box body (1), the air intake pump (3) is connected to the outside, and an exhaust pipe (4) is connected to the top of the box body (1); A fixing rod (6) is fixedly installed at the bottom of the box body (1), a mounting tube (8) is fixedly installed on the top of the fixing rod (6) through a support plate (7), a bracket (9) is rotatably installed on the mounting tube (8), a mounting ring (10) is fixedly installed on the bracket (9), and a plurality of first support plates (11) are fixedly installed on the mounting ring (10), a support rod (14) is arranged coaxially with the mounting tube (8) and passes through the mounting tube (8) in the box body (1), a telescopic member (12) for driving the support rod (14) to move up and down is fixedly installed at the bottom of the box body (1), a cross plate (15) is fixedly installed at the top of the support rod (14), and a plurality of second support plates (16) are fixedly installed on the cross plate (15), and a plurality of heating tubes (29) are fixedly installed at the bottom of the box body (1); A rotating power member (17) is fixedly mounted on the inner bottom surface of the box body (1); a first gear (18) is fixedly mounted on the end of the output shaft of the rotating power member (17); the first gear (18) meshes with a second gear (19) arranged on the fixed rod (6); a vertical tube (30) is rotatably mounted on the fixed rod (6); the second gear (19) is fixedly mounted on the vertical tube (30); a third gear (20) is fixedly mounted on the vertical tube (30); the third gear (20) meshes with a first gear ring (21) fixedly mounted on the bracket (9); and the first gear ring (21) is coaxially arranged with the mounting tube (8); A first iron cylinder (22) is rotatably mounted on the lower end of the mounting tube (8); a second gear ring (23) is fixedly mounted on the outer side of the first iron cylinder (22); the second gear ring (23) is meshed with the first gear (18); a plurality of groups of first magnet blocks (24) are fixedly mounted on the support rod (14) and are distributed in a circular array around the support rod (14); when the support rod (14) moves upward, the end of the first magnet block (24) is in sliding contact with the inner wall of the first iron cylinder (22); A second iron cylinder (25) is fixedly mounted on the bracket (9), and a plurality of groups of second magnet blocks (26) distributed in a circular array around the support rod (14) are fixedly mounted on the support rod (14); when the support rod (14) moves upward, the ends of the second magnet blocks (26) are in sliding contact with the inner wall of the second iron cylinder (25).

2. The electric constant temperature drying oven for chemical testing according to claim 1, characterized in that: A temperature sensor (5) for detecting the air temperature in the box (1) is fixedly installed in the box (1), and two groups of fans (27) are fixedly installed in the box (1) at intervals, with the blowing direction of the fans (27) pointing to the area where the material is located.

3. The electric constant temperature drying oven for chemical testing according to claim 1, characterized in that: The first support plates (11) are distributed along the radial direction of the mounting ring (10), and an end of the first support plate (11) located inside the mounting ring (10) is spaced from the center of the mounting ring (10).

4. The electric constant temperature drying oven for chemical testing according to claim 3, characterized in that: The plurality of groups of the second support plates (16) have different lengths and are distributed in parallel; the rotational coverage area of ​​the second support plates (16) is circular; and a gap is provided between the rotational coverage circular area of ​​the second support plates (16) and the end of the first support plate (11).

5. The electric constant temperature drying oven for chemical testing according to claim 1, characterized in that: A connector (13) is fixedly mounted on the output end of the telescopic member (12), and the connector (13) is rotatably connected to the support rod (14).

6. The electric constant temperature drying oven for chemical testing according to claim 1, characterized in that: A limiting cylinder (28) is fixedly mounted on the mounting ring (10), the limiting cylinder (28) extending toward the bottom surface of the box body (1) and a gap is provided between the lower end of the limiting cylinder (28) and the bottom surface of the box body (1), and the heating tube (29) is located in the limiting cylinder (28).

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