Electrothermal blowing drying box
By designing a multi-layer pallet and support component structure in an electric-thermal blower drying box, uniform circulation of hot air and uniform heating of the test body are achieved, and the problems of low drying efficiency and uneven heating in the prior art are solved. Through the design of limiting components and anti-shake plates, the risk of scalds and the problem of shaking of the pallets is reduced, and the drying efficiency and discharge quality are improved.
Patent Information
- Application Number
- CN202420638137.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-03-29
AI Technical Summary
When drying concrete test bodies in the existing electric air blower drying box, the hot air circulation is uneven, resulting in low drying efficiency and uneven heating of the test bodies, which affects the discharge quality and subsequent test results. In addition, there is a risk of scalding when removing the test body, and the pallet is prone to shake, misalignment or run out of the box.
An electric blower drying box is designed, adopting a multi-layer pallet and support component structure. Through the cooperation of the airflow strip port and support component, uniform circulation of hot air and uniform heating of the test body are achieved. At the same time, through the design of limit components and anti-shaver plates, the pallets are more stable during pick-up and placement and handling, reducing the risk of scalds.
The uniform drying of the concrete test body is achieved, the drying efficiency and discharge quality are improved, the risk of scalding is reduced, and the stability of the pallet is ensured, avoiding the problems of shaking, misalignment or running out of the box.
Smart Images
Figure CN222881524U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a drying box, in particular to an electric heating blast drying box, belonging to the technical field of electric heating blast drying equipment. Background Art
[0002] Concrete is one of the most important civil engineering materials in contemporary times. It is an artificial stone made of cementitious materials, granular aggregates, water, and admixtures and additives added in a certain proportion, which are evenly stirred, compacted into shape, and cured and hardened. Before mass production of concrete, in order to ensure the characteristics of concrete, it is necessary to conduct concrete performance tests in the laboratory. The test method is generally to make concrete samples according to the corresponding proportions of the raw materials, and test the performance of the concrete through the prepared concrete samples. In the process of making concrete samples, the drying of concrete sample specimens is often involved.
[0003] The drying process of concrete sample specimens requires the use of an electric blast drying oven, which is also known as an "oven". As the name suggests, it uses electric heating to perform blast cycle drying tests. The electric blast drying oven is a common laboratory equipment that can be used to dry, solidify and heat items. The electric blast drying oven is usually composed of an outer shell, an inner tank, a control system, a heating system, and an air blast system. The outer shell is made of high-quality steel plate, and the surface is sprayed with electrostatic powder, which is corrosion-resistant and beautiful; the inner tank is made of stainless steel material, which has good corrosion resistance and is easy to clean; the control system can realize functions such as temperature control, time control, and digital display; the heating system uses a heating tube or an electric heating sheet for heating, which can quickly reach the set temperature; the air blast system can force the air to circulate through a fan to accelerate the drying process, specifically to blow the air in the box to the electric heater for heating and then send it to the studio, and then the studio inhales the fan and blows it to the electric heating tube for heating. While continuously circulating and heating, it also makes the temperature in the box more uniform.
[0004] The concrete specimen is usually a block structure with six horizontal sides. When it is placed inside the drying oven, the area of the side in contact with the pallet (or tray, rack, etc.) in the drying oven is large (even if the pallet is mostly a grid-like structure), and hot air is difficult to circulate between the pallet and the lower surface of the specimen (it can only circulate on the lower surface of the pallet), which not only reduces the drying efficiency, but also fails to heat the concrete specimen evenly, affecting the quality of the discharge, which in turn affects subsequent testing. In addition, the existing electric hot air drying oven has a high temperature after operation, so when reaching into the box to take out the specimen sample, not only do you need to wear protective gloves, but there is also a risk of burns if you are not careful, and the applicability is poor. Finally, the pallet in the drying oven is often a movable structure that can be completely pulled out of the box. During the process of taking and placing specimens, unpacking operations, or moving the box, the pallet is prone to shaking, dislocation, or even running out of the box. Summary of the invention
[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides an electric heating blast drying oven.
[0006] The technical solution adopted by the utility model is: designing an electric heating blast drying box, including a box body, a control system, a heating system and a blast system;
[0007] The control system is installed on the box, and a heating system and an air blowing system are installed inside the box, and the heating system and the air blowing system are electrically connected to the control system respectively; the heating system adopts a heating tube for heating, and the air blowing system uses a fan to force the air in the inner cavity of the box to circulate, and the inner cavity of the box is provided with a multi-layer support plate;
[0008] It also includes a supporting component and a limiting component;
[0009] A plurality of airflow strip openings are arranged on the support plate, and the airflow strip openings are arranged horizontally on the support plate. A group of supporting components are respectively arranged at the left and right ends of the airflow strip openings. The supporting components can slide left and right along the airflow strip openings to any position and clamp the support plate. The support plate is slidably connected to the box body, and a limiting component is arranged at the front end of the box body. Limiting holes are respectively arranged at the front and rear ends of the support plate. The limiting component is a retractable structure, which extends into the limiting hole to limit the support plate.
[0010] Furthermore, the support assembly described in the present design includes a support rod, an anti-dropout sheet, a sliding sheet, a clamping spring and an anti-dropout cap. The upper end of the support rod passes through a support plate, and an anti-dropout sheet is fixedly provided on the part of the support rod passing through the support plate. The rod body of the support rod located under the support plate is provided with a sliding sheet and an anti-dropout cap in sequence from top to bottom. The sliding sheet is slidably connected to the support rod, and the anti-dropout cap is threadedly connected to the support rod. A clamping spring is provided on the outer surface of the rod body of the support rod between the anti-dropout cap and the sliding sheet.
[0011] Furthermore, the left and right inner walls of the box body cavity of the present design are respectively provided with multiple layers of inner support bars, the inner support bars on the left and right inner walls of the box body cavity correspond to each other and are flush, the left and right ends of the support plate are respectively resting on the inner support bars and can slide along the inner support bars.
[0012] Furthermore, the present design also includes an anti-rocking plate, and an anti-rocking plate is respectively arranged on the front upper side of each inner support bar, and a gap is left between the anti-rocking plate and the inner support bar to allow the support plate to be inserted.
[0013] Furthermore, the front end of the anti-rocking plate of the present design does not exceed the front end of the inner support bar, and the length of the anti-rocking plate is more than 3 cm.
[0014] Furthermore, the anti-warp plate of the present design includes an integrally formed warp portion and a flat portion, the warp portion is located at the front end, the flat portion is horizontally arranged, the warp portion is upwardly warped relative to the flat portion, and the length of the flat portion is more than 2 cm.
[0015] Furthermore, the present design has two inner support bars at the same horizontal position, and a group of limiting components is provided on the upper side of one of the inner support bars. The limiting components are provided on the anti-skid plate, and the lower end of the limiting components is a telescopic structure, which limits the support plate when it extends into the limiting hole on the support plate.
[0016] Furthermore, the limit assembly described in the present design includes a limit rod, a return spring, a limit cylinder and a limit plate. The limit cylinder is fixed on the anti-rocking plate. The limit rod passes through the limit cylinder and the anti-rocking plate and can slide up and down. The limit rod is located in the limit cylinder and a limit plate is fixedly provided on the rod body. A return spring is provided on the limit rod between the limit plate and the upper end of the limit cylinder.
[0017] Furthermore, the lower end of the limit rod in the present design is a rectangular block, and a rectangular through hole is opened on the anti-skid plate. The lower end of the limit rod slides up and down in the through hole to extend into or exit the limit hole on the support plate, and the front side of the lower end of the limit rod is set to a slope shape.
[0018] Furthermore, the front and rear ends of the support plate described in the present design are respectively provided with grip openings.
[0019] Compared with the prior art, the beneficial effects of the utility model are:
[0020] The utility model can select different numbers of support components to form a support structure according to the size of the concrete specimen that needs to be dried, such as three-point support, four-point support, five-point support, etc., and is flexible to use. In this way, the specimen is supported by the support components, and hot air can flow between the lower surface of the concrete specimen and the upper surface of the support plate to accelerate drying. Circulating hot air flows on all surfaces of the specimen, so that the specimen is heated more evenly. Moreover, a small number of support components support the specimen, and the area of the specimen used for contact and bonding with the external structure is reduced, which further accelerates drying, improves the discharge quality, and improves the accuracy of subsequent test data.
[0021] The utility model facilitates the pulling and pulling of the tray through the design of the grip, and facilitates the pulling of the tray without completely pulling out the box body through the coordination of the limit assembly and the anti-swing plate, so as to carry out the operation of taking and placing the concrete specimen, reduce the risk of scalding, and be more convenient to use. Finally, the coordination of the limit assembly and the anti-swing plate ensures that when the tray in the drying box is fully inserted into the box body and partially pulled out of the box body, the tray is not likely to shake, be misplaced, or even run out of the box body during the process of taking and placing the specimen, unpacking the box, or carrying the box body.
[0022] The utility model is easy to use, is conducive to uniform drying of materials on the supporting plate, saves drying time, improves drying efficiency and drying quality, and is also convenient for taking out the articles after drying. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 It is a schematic diagram of the axonometric drawing of the utility model.
[0025] Figure 2 For this utility model Figure 1 Schematic diagram of the longitudinal section view of the state.
[0026] Figure 3 for Figure 2 Enlarged schematic diagram of part A.
[0027] Figure 4 This is a schematic diagram of the support assembly of the utility model.
[0028] Figure 5 The utility model is a schematic diagram of a support structure in which two groups of three-point supports are formed by the support components on the pallet.
[0029] Figure 6 It is a schematic diagram of the support assembly of the utility model.
[0030] In the figure: 1. box body; 2. support plate; 3. support assembly; 4. limit assembly; 5. air flow strip opening; 6. limit hole; 7. support rod; 8. anti-drop plate; 9. slide plate; 10. clamping spring; 11. anti-drop cap; 12. inner support bar; 13. anti-rocking plate; 14. limit rod; 15. reset spring; 16. limit cylinder; 17. limit plate; 18. handle opening. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] Example 1
[0034] like Figure 1-Figure 6 As shown: an electric heating blast drying oven, comprising a box body 1, a control system, a heating system and a blast system;
[0035] A control system is installed on the box 1, and a heating system and a blast system are installed inside the box 1, and the heating system and the blast system are electrically connected to the control system respectively; the heating system adopts an electric heating tube for heating, and the blast system forces the air in the inner cavity of the box 1 to circulate through a fan. One of the functions of the blast system is to make the air in the box convectively circulate, and the second function is to continuously inhale a part of the fresh air outside the box from the uniquely designed air inlet duct into the box for heating circulation without affecting the temperature in the working room. While a certain volume of external gas is inhaled into the box, the same volume of exhaust gas with water vapor will be discharged from the upper adjustable exhaust hole to the outside of the box. The air exchange volume (or exhaust gas exhaust rate) inside and outside the box can be adjusted by changing the size of the outlet hole. Through the continuous exchange of indoor and outdoor air, moisture is also taken out of the box, thereby achieving the purpose of drying.
[0036] The inner cavity of the box body 1 is usually provided with two layers of removable trays 2 for placing items to be dried.
[0037] The above are all prior art and will not be described in detail here.
[0038] The electric hot air drying oven described in this embodiment also includes a support component 3 and a limit component 4; the support plate 2 is provided with a plurality of airflow strip openings 5, the airflow strip openings 5 are horizontally arranged on the support plate 2, and a group of support components 3 are respectively arranged at the left and right ends of the airflow strip openings 5, that is, a plurality of groups of support components 3 are respectively arranged on the left and right sides of the support plate 2, and the support components 3 can slide left and right along the airflow strip openings 5 to any position and clamp the support plate 2. According to the size of the concrete specimen to be dried, different numbers of support components 3 are selected to form a support structure, which is flexible to use, such as three-point support (such as Figure 5As shown), four-point support, five-point support, etc., in this way, the specimen is supported by the support assembly 3, and hot air can flow between the lower surface of the concrete specimen and the upper surface of the support plate 2 to accelerate drying. Circulating hot air flows on all surfaces of the specimen, making the specimen heated more evenly. Moreover, a small number of support assemblies 3 support the specimen, and the area of the specimen used for contact and bonding with the external structure is reduced, further accelerating drying.
[0039] In the electric hot air drying box described in this embodiment, the support plate 2 is slidably connected to the box body 1, and the support plate 2 can slide forward and backward. The front end of the box body 1 is provided with a limit assembly 4, and the front and rear ends of the support plate 2 are respectively provided with limit holes 6. The limit assembly 4 is a retractable structure, which extends into the limit hole 6 to limit the support plate 2. When the support plate 2 is fully inserted into the box body 1, the limit assembly 4 extends into the limit hole 6 at the front end of the support plate 2 to limit and fix the support plate 2. When the support plate 2 is pulled out of the box body 1, the limit assembly 4 extends into the limit hole 6 at the rear end of the support plate 2 to limit and fix the support plate 2, so that the support plate 2 can be suspended outside the box body 1, which is convenient for taking and placing concrete specimens.
[0040] Example 2
[0041] This embodiment further refines the design of the support assembly 3 based on the embodiment 1, specifically:
[0042] like Figure 6 As shown, the support assembly 3 described in this embodiment includes a support rod 7, an anti-drop sheet 8, a slide 9, a clamping spring 10 and an anti-drop cap 11. The support rod 7 is a cylindrical rod, and the upper end of the support rod 7 passes through the support plate 2. The part of the upper end of the support rod 7 that passes through the support plate 2 is fixedly provided with an anti-drop sheet 8, so that the support rod 7 cannot fall out of the support plate 2 downward and provide a supporting force for the test body. The rod body of the support rod 7 located under the support plate 2 is provided with a slide 9 and an anti-drop cap 11 from top to bottom in sequence. The slide 9 is slidably connected to the support rod 7, and the slide 9 is a circular ring sheet. The anti-drop cap 11 (a nut can be directly used) is threadedly connected to the support rod 7, and the clamping spring 10 is arranged outside the rod body of the support rod 7 between the anti-drop cap 11 and the slide 9. When it is necessary to move the support assembly 3, the palm of the hand is against the anti-drop cap 11, and the thumb, index finger and middle finger cooperate to move the slice downward, and then after slightly lifting the support assembly 3 upward, the support assembly 3 is slid left and right to the required position. It is also possible to directly hold the support assembly 3 and slide it back and forth. In this embodiment, the slide plate 9 is lifted by the clamping spring 10 so that the slide plate 9 cooperates with the anti-slip plate 8 to clamp the support plate 2 to a certain extent, so that the support assembly 3 will not easily shift or slide after being moved to the specified position.
[0043] Example 3
[0044] This embodiment further refines the design of the electric heating blast drying oven based on the embodiment 2, specifically:
[0045] The left and right inner walls of the inner cavity of the box body 1 are respectively provided with six layers of inner support bars 12, and the inner support bars 12 are L-plates, which are fixed by locking screws. The inner support bars 12 on the left and right inner walls of the inner cavity of the box body 1 correspond to each other and are flush. The left and right ends of the support plate 2 are respectively parked on the inner support bars 12, and can slide along the inner support bars 12 and be pulled out of the box body 1. Thereby, the support plate 2 can be placed on any layer of the inner support bars 12 to obtain concrete specimen storage space of different heights, so as to facilitate the drying of concrete specimens of different specifications.
[0046] Example 4
[0047] This embodiment further refines the design of the electric heating blast drying oven based on the embodiment 3, specifically:
[0048] The electric hot air drying oven described in this embodiment also includes an anti-sway plate 13, and an anti-sway plate 13 is respectively provided on the front upper side of each inner support bar 12. A gap is left between the anti-sway plate 13 and the inner support bar 12 to allow the support plate 2 to be inserted, and the width of the gap is less than 1.5 times the thickness of the support plate 2. When the support plate 2 is pulled out of the box body 1 and is not completely separated from the box body 1 for taking and placing the concrete specimen, the support plate 2 is pressed by the anti-sway plate 13, and the anti-sway plate 13 cooperates with the limiting component 4 to well limit the support plate 2 at the front of the box body 1, so as to facilitate taking and placing the specimen sample.
[0049] In this embodiment, the front end of the anti-rocking plate 13 does not exceed the front end of the inner support bar 12, which facilitates the installation and closing of the door and also prevents the operator's hands from being scratched to a certain extent. The length of the anti-rocking plate 13 is more than 3 cm to provide a sufficiently reliable limiting structure.
[0050] More specifically, in this embodiment, the anti-warp plate 13 includes an integrally formed warped portion and a flat portion, the warped portion is located at the front end, the flat portion is horizontally arranged, the warped portion is upwardly tilted relative to the flat portion to form an open structure, which is convenient for inserting the support plate 2, and the length of the flat portion is more than 2 cm, providing sufficient effective length for pressing the support plate 2.
[0051] Example 5
[0052] This embodiment further refines the design of the electric heating blast drying oven based on the embodiment 4, specifically:
[0053] In the electric hot air drying oven described in this embodiment, two inner support bars 12 are at the same horizontal position, and a set of limit components 4 is arranged on the upper side of one of the inner support bars 12, that is, the limit components 4 are arranged on only one of the two inner support bars 12 at the same height, so that a single person can operate the limit components 4 to extend and retract while pushing and pulling the pallet 2. The limit components 4 are arranged on the anti-warp plate 13, and the lower end of the limit components 4 is a telescopic structure, which limits the pallet 2 when it extends into the limit hole 6 on the pallet 2, and releases the pallet 2 when it exits the limit hole 6 on the pallet 2, so that the pallet 2 can be pushed and pulled.
[0054] Example 6
[0055] This embodiment further refines the design of the limit assembly 4 on the basis of the embodiment 5, specifically providing a more detailed structure of the limit assembly 4:
[0056] like Figure 3 As shown, the limiting assembly 4 includes a limiting rod 14, a reset spring 15, a limiting cylinder 16 and a limiting piece 17. The limiting cylinder 16 is fixed on the anti-rocking plate 13. The limiting rod 14 passes through the limiting cylinder 16 and the anti-rocking plate 13 and can slide up and down. The limiting rod 14 is located in the limiting cylinder 16 and a limiting piece 17 is fixedly arranged on the rod body. The limiting piece 17 ensures that the limiting rod 14 will not be separated from the limiting cylinder 16 when it moves upward, and will not be separated from the anti-rocking plate 13 when it moves downward. The limiting piece 17 A return spring 15 is sleeved on the limit rod 14 between the upper end of the limit tube 16. By lifting the limit rod 14 outside the limit tube 16, the limit rod 14 is pulled out of the limit hole 6 on the support plate 2. At this time, the return spring 15 is compressed by the limit plate 17, and the support plate 2 can be pulled forward and backward. After the support plate 2 is inserted into or pulled out into place, the limit rod 14 is released. Under the action of the return spring 15, the limit rod 14 slides downward and is inserted into the limit hole 6 on the support plate 2, thereby locking the position of the support plate 2.
[0057] Example 7
[0058] This embodiment further refines the design of the limit assembly 4 on the basis of the embodiment 6, specifically:
[0059] The lower end of the limit rod 14 (the position below the limit plate 17) is a rectangular block structure, and the limit rod 14 above the limit plate 17 can be a round rod or a rectangular rod. A rectangular through hole is opened on the anti-rocking plate 13, and the lower end of the limit rod 14 slides up and down in the through hole to extend into or exit the limit hole 6 on the pallet 2. The rectangular structure constrains the limit rod 14 from rotating during the sliding process, and the front side of the lower end of the limit rod 14 is set to a slope shape. During the process of inserting the pallet 2, there is no need to manually lift the limit rod 14 of the limit assembly 4. The limit rod 14 is automatically lifted by the pallet 2 until the pallet 2 is inserted into place.
[0060] In this embodiment, the front and rear ends of the support plate 2 are respectively provided with grip openings 18, which are convenient for holding and pulling the support plate 2. The front and rear ends of the support plate 2 can be used as insertion ends to be inserted into the box body 1, which is more versatile and easier to use.
[0061] When using the utility model, the user pulls the limiting rod 14 of the limiting assembly 4 with one hand, and pulls out the support plate 2 with the other hand until the limiting hole 6 at the rear end of the support plate 2 is aligned with the limiting rod 14, and then releases the limiting rod 14, and the limiting rod 14 is inserted into the limiting hole 6, and the support plate 2 is restricted at the front end of the box body 1. According to the size of the concrete specimen to be dried, a certain number and position of support assemblies 3 are selected, and the position of the support assemblies 3 is adjusted to form a support structure (such as a three-point support), the specimen is placed on the support structure composed of the support assemblies 3, and then the support plate 2 is pushed into the box body 1, and the box door is closed for drying. After drying is completed, the user pulls the limit rod 14 of the limit assembly 4 with one hand and reaches into the handle 18 on the support plate 2 with the other hand to pull out the support plate 2 until the limit hole 6 at the rear end of the support plate 2 is aligned with the limit rod 14, and then releases the limit rod 14. The limit rod 14 is inserted into the limit hole 6, and the support plate 2 is restricted at the front end of the box body 1. The specimen is removed, and then the support assembly 3 is moved to both sides of the support plate 2, and the support plate 2 is pushed into the box body 1 and the box door is closed; if the support plate 2 needs to be cleaned, the limit rod 14 is lifted and the support plate 2 is pulled out for cleaning.
[0062] In addition, in the description of the present utility model, unless otherwise specified, if the terms "multiple", "multiple roots", "multiple groups" are used, they mean two or more than two, and "several", "several roots", "several groups" mean one or more than one. In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", "third" are used, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0063] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.
Claims
1. An electric heating blast drying oven, comprising a box body, a control system, a heating system and a blast system; The control system is installed on the box, and a heating system and an air blowing system are installed inside the box, and the heating system and the air blowing system are electrically connected to the control system respectively; the heating system adopts a heating tube for heating, and the air blowing system uses a fan to force the air in the inner cavity of the box to circulate, and the inner cavity of the box is provided with a multi-layer support plate; Features: It also includes a support component and a limit component; A plurality of airflow strip openings are arranged on the support plate, and the airflow strip openings are arranged horizontally on the support plate. A group of supporting components are respectively arranged at the left and right ends of the airflow strip openings. The supporting components can slide left and right along the airflow strip openings to any position and clamp the support plate. The support plate is slidably connected to the box body, and a limiting component is arranged at the front end of the box body. Limiting holes are respectively arranged at the front and rear ends of the support plate. The limiting component is a retractable structure, which extends into the limiting hole to limit the support plate.
2. The electric heating blast drying oven according to claim 1, characterized in that: The support assembly includes a support rod, an anti-drop sheet, a sliding sheet, a clamping spring and an anti-drop cap. The upper end of the support rod passes through a support plate, and an anti-drop sheet is fixedly arranged on the part of the support rod passing through the support plate. The support rod body located under the support plate is provided with a sliding sheet and an anti-drop cap in sequence from top to bottom. The sliding sheet is slidably connected to the support rod, and the anti-drop cap is threadedly connected to the support rod. A clamping spring is arranged on the outer surface of the support rod body between the anti-drop cap and the sliding sheet.
3. The electric heating blast drying oven according to claim 1 or 2, characterized in that: The left and right inner walls of the box body cavity are respectively provided with multiple layers of inner support bars, the inner support bars on the left and right inner walls of the box body cavity correspond to each other and are flush, the left and right ends of the support plate are respectively parked on the inner support bars and can slide along the inner support bars.
4. The electric heating blast drying oven according to claim 3, characterized in that: It also includes an anti-rocking plate, and an anti-rocking plate is respectively arranged on the front upper side of each inner support bar, and a gap is left between the anti-rocking plate and the inner support bar to allow the support plate to be inserted.
5. The electric heating blast drying oven according to claim 4, characterized in that: The front end of the anti-rocking plate does not exceed the front end of the inner support bar, and the length of the anti-rocking plate is more than 3 cm.
6. The electric heating blast drying oven according to claim 5, characterized in that: The anti-warp plate includes an integrally formed warp portion and a flat portion, wherein the warp portion is located at the front end, the flat portion is horizontally arranged, the warp portion is upwardly warped relative to the flat portion, and the length of the flat portion is more than 2 cm.
7. The electric heating blast drying oven according to claim 6, characterized in that: There are two inner support bars at the same horizontal position, and a group of limiting components is arranged on the upper side of one of the inner support bars. The limiting components are arranged on the anti-skid plate, and the lower end of the limiting components is a telescopic structure, which limits the support plate when it extends into the limiting hole on the support plate.
8. The electric heating blast drying oven according to claim 7, characterized in that: The limit assembly includes a limit rod, a return spring, a limit cylinder and a limit plate. The limit cylinder is fixed on the anti-rocking plate. The limit rod passes through the limit cylinder and the anti-rocking plate and can slide up and down. The limit rod is located in the limit cylinder and a limit plate is fixedly arranged on the rod body. A return spring is sleeved on the limit rod between the limit plate and the upper end of the limit cylinder.
9. The electric heating blast drying oven according to claim 8, characterized in that: The lower end of the limit rod is a rectangular block, and a rectangular through hole is opened on the anti-rocking plate. The lower end of the limit rod slides up and down in the through hole to extend into or exit the limit hole on the support plate, and the front side of the lower end of the limit rod is set to be sloped.
10. The electric heating blast drying oven according to claim 9, characterized in that: The front and rear ends of the support plate are respectively provided with grip openings.