High efficiency rubber tire production oven

By introducing guide rails and limiting components into the drying oven used in rubber tire production, the problem of inconsistent spacing between transport vehicles was solved, improving work efficiency and the consistency of drying effect, and ensuring product quality.

CN117601329BActive Publication Date: 2026-07-31中策橡胶(天津)有限公司
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
中策橡胶(天津)有限公司
Filing Date
2023-11-03
Publication Date
2026-07-31

AI Technical Summary

Technical Problem

In the current rubber tire production process, the inconsistent spacing between manually moved transport vehicles leads to uneven drying results, posing safety hazards, low efficiency, and affecting product quality.

Method used

An oven comprising guide rails and limiting components was designed. The guide rails enable the movable connection of transport vehicles, and the limiting components ensure that the transport vehicles are positioned at equal intervals. Combined with heaters and return air pipes, uniform heating is achieved.

Benefits of technology

It achieves equidistant positioning of transport vehicles, improves work efficiency, avoids burns to personnel, and ensures consistent drying results and product quality.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117601329B_ABST
    Figure CN117601329B_ABST
Patent Text Reader

Abstract

This invention provides a high-efficiency drying oven for rubber tire production, comprising: a box body with a drying chamber inside, and an opening at one end of the box body; a sealing door hinged to the upper end of the sealing door for closing the opening of the box body; multiple transport vehicles with placement positions for placing semi-finished tires; a guide rail fixedly installed at the bottom of the inner side of the box body, with the transport vehicles movably connected to the guide rail; and a limiting assembly configured to position the multiple transport vehicles at equal intervals within the drying chamber. The beneficial effects of this invention are: the limiting assembly enables equal-interval positioning of the transport vehicles, improving work efficiency and preventing burns to personnel.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing technology, and in particular relates to a high-efficiency drying oven for rubber tire production. Background Technology

[0002] During the tire production process, semi-finished tires need to be placed in an oven for drying. In actual production, due to production cycle issues, multiple models of semi-finished tires need to be placed on transport vehicles, and then multiple transport vehicles are placed in the oven for drying in sequence. In order to ensure the drying effect, the transport vehicles need to be moved manually to ensure that the gap between adjacent transport vehicles is consistent.

[0003] This production process has the following problems: First, the spacing between the transport vehicles inside the drying oven can easily burn the operators; second, manual operation is inefficient and subject to subjective bias, making it difficult to ensure the consistency of the gaps between adjacent transport vehicles, which will also affect product quality to some extent. Summary of the Invention

[0004] In view of this, the present invention aims to provide a high-efficiency drying oven for rubber tire production, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] The first aspect of this invention provides a high-efficiency drying oven for rubber tire production, comprising:

[0007] The box body has a drying chamber inside, and an opening is opened at one end of the box body;

[0008] A sealing door, the upper end of which is hinged to the box body, is used to close the opening of the box body;

[0009] The transport vehicle is equipped with a placement space for placing semi-finished tires, and there are multiple transport vehicles in total;

[0010] The guide rail is fixedly installed at the bottom of the inner side of the box, and the transport vehicle is movably connected to the guide rail;

[0011] A limiting component is configured to position multiple transport vehicles at equal intervals within the drying chamber.

[0012] Furthermore, an air inlet pipe is fixedly provided at the end of the box away from the opening, the air inlet pipe is connected to the lower end of the drying chamber, and the air inlet pipe is connected to the air outlet of the heater.

[0013] A return air pipe is fixedly installed at one end of the box near the opening. The return air pipe is connected to the upper end of the drying chamber and to the air inlet of the heater.

[0014] Furthermore, the transport vehicle includes a base plate, and a roller is fixedly mounted on the lower end of the base plate. The roller has an annular groove that matches the guide rail.

[0015] Multiple vertical rods are fixedly provided on the upper end of the base plate, and multiple parallel placement plates are fixedly provided on the vertical rods. The placement plates are parallel to the base plate.

[0016] The upper surface of the base plate forms a placement position, and the upper surface of the placement plate forms a placement position.

[0017] Furthermore, the limiting component includes a limiting plate, one end of which is fixedly provided with an inverted V-shaped boss, and the other end of which is fixedly provided with a limiting post. The bottom plate has a limiting groove that matches the limiting post. The limiting plate is installed inside the drying chamber. A compression spring is provided between the limiting plate and the bottom of the drying chamber. The height of the limiting post matches the height of the inverted V-shaped boss. The inverted V-shaped boss is positioned away from the opening of the chamber.

[0018] The bottom end of the base plate has an installation groove, the bottom end of the installation groove is fixed with a positioning tube, the positioning tube is provided with a pull rod, the pull rod is set through the positioning tube of all transport vehicles, the diameter of the pull rod matches the inner diameter of the positioning tube, and a paddle is fixed on the side wall of the pull rod, the paddle is set along the length direction of the pull rod.

[0019] When the paddle is set downwards, the lower end face of the paddle is flush with the lower end face of the base plate;

[0020] When the lever is facing upwards or horizontally, the lower outer wall of the pull rod is flush with the upper surface of the inverted V-shaped boss.

[0021] The side wall of the positioning tube has a notch that matches the paddle, and the notch is set parallel to the base plate;

[0022] The length of the lever is greater than the distance between the positioning post and the top of the inverted V-shaped boss.

[0023] Furthermore, the end face of the positioning tube away from the opening has a positioning groove one and a positioning groove two that match the lever;

[0024] Both positioning groove one and positioning groove two are set perpendicular to the base plate. Positioning groove one extends towards the base plate, and positioning groove two extends away from the base plate.

[0025] Furthermore, the lower end of the limiting plate is provided with multiple guide tubes, and the bottom end of the drying chamber is fixed with multiple guide rods, which are installed on the inner side of the guide tubes.

[0026] The compression spring is installed on the outside of the guide tube.

[0027] Furthermore, the lower end of the limiting plate is fixed with a plurality of mounting posts, the outer side of the mounting posts is threaded, the inner side of the guide tube near the mounting posts is threaded, and the guide tube is threadedly connected to the mounting posts.

[0028] Furthermore, an annular guide boss is fixedly provided on the inner side of one end of the guide tube near the guide rod, and an annular limiting boss is fixedly provided on the outer side of the upper end of the guide rod. The inner diameter of the annular guide boss matches the outer diameter of the guide rod, and the diameter of the annular limiting boss matches the inner diameter of the guide tube.

[0029] Furthermore, the sealing door has a through hole that matches the pull rod.

[0030] A second aspect of the present invention provides a method for using the high-efficiency rubber tire production oven described in the first aspect, comprising the following steps:

[0031] S1. Align the lever's paddle with the notch that passes through the positioning tubes on multiple transport vehicles, and rotate the lever to align the paddle with positioning groove two;

[0032] S2. Push the transport vehicle and pull rod into the drying chamber. The paddle first contacts the inverted V-shaped boss. Under the guidance of the upper surface of the inverted V-shaped boss, the limiting plate moves downward and the limiting post releases the limiting on the bottom plate. All transport vehicles move to the end of the box away from the opening.

[0033] S3. Rotate the lever to align the paddle with the positioning groove one, and move the lever towards the opening direction. The lever drives the transport vehicle to move towards the opening direction. Under the elastic force of the compression spring, when the limiting post is aligned with the limiting groove, the limiting post is inserted into the limiting groove of the innermost transport vehicle bottom plate.

[0034] S4. Rotate the lever to align the paddle with the notch. After the paddle passes through the positioning tube on the innermost transport vehicle floor, rotate the lever again to align the paddle with the positioning slot of the second transport vehicle.

[0035] S5. Repeat steps S3-S4 until each transport vehicle is limited by a corresponding limiting component.

[0036] Compared with the prior art, the high-efficiency drying oven for rubber tire production described in this invention has the following advantages:

[0037] (1) The high-efficiency drying oven for rubber tire production described in this invention can achieve equidistant positioning of transport vehicles through the limiting component, thereby improving work efficiency and preventing personnel burns.

[0038] (2) The high-efficiency rubber tire production oven of the present invention has an annular guide boss fixed on the inner side of the guide tube near the guide rod, and an annular limiting boss fixed on the outer side of the upper end of the guide rod. The inner diameter of the annular guide boss matches the outer diameter of the guide rod, and the diameter of the annular limiting boss matches the inner diameter of the guide tube. The guide rod plays a guiding role in the process of moving up and down on the limiting plate, making its movement process more stable. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the three-dimensional structure of the oven according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the cross-sectional structure of the oven according to an embodiment of the present invention;

[0042] Figure 3 This is a three-dimensional structural diagram of the transport vehicle according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic cross-sectional view of the transport vehicle according to an embodiment of the present invention;

[0044] Figure 5 As described in the embodiments of the present invention Figure 4 Schematic diagram of the structure at point A in the middle;

[0045] Figure 6 This is a schematic diagram of the three-dimensional structure of the pull rod according to an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the three-dimensional structure of the limiting plate according to an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the three-dimensional structure of the positioning tube according to an embodiment of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Housing; 2. Sealed door; 3. Pull rod; 4. Return air pipe; 5. Inlet air pipe; 6. Guide rail; 7. Transport vehicle; 8. Limiting assembly; 301. Paddle; 701. Base plate; 702. Vertical rod; 703. Placement plate; 704. Roller; 705. Mounting groove; 706. Positioning tube; 707. Limiting groove; 70401. Annular groove; 70601. Notch; 70602. Positioning groove one; 70603. Positioning groove two; 801. Limiting plate; 802. Limiting post; 803. Mounting post; 804. Compression spring; 805. Guide tube; 806. Guide rod; 80501. Annular guide boss; 80601. Annular limiting boss; 80101. Inverted V-shaped boss. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] like Figures 1 to 8 As shown, a high-efficiency drying oven for rubber tire production includes:

[0055] Box 1, with a drying chamber inside the box 1, and an opening at one end of the box 1;

[0056] Sealing door 2, the upper end of sealing door 2 is hinged to box body 1, sealing door 2 is used to close the opening of box body 1;

[0057] Transport vehicle 7, which is equipped with a placement space for semi-finished tires, and there are multiple transport vehicles 7;

[0058] Guide rail 6 is fixedly installed at the bottom of the inner side of the box 1, and transport vehicle 7 is movably connected to guide rail 6;

[0059] The limiting component 8 is configured to position multiple transport vehicles 7 at equal intervals within the drying chamber. There are multiple limiting components 8, with each transport vehicle 7 corresponding to one limiting component 8.

[0060] An air inlet pipe 5 is fixedly installed at the end of the housing 1 away from the opening. The air inlet pipe 5 is connected to the lower end of the drying chamber and the air outlet of the heater.

[0061] A return air pipe 4 is fixedly installed at one end of the chamber 1 near the opening. The return air pipe 4 is connected to the upper end of the drying chamber and to the air inlet of the heater. The heater is, but is not limited to, the existing circulating air electric heating oven heater.

[0062] The transport vehicle 7 includes a base plate 701, and a roller 704 is fixedly provided at the lower end of the base plate 701. The roller 704 has an annular groove 70401 that matches the guide rail 6.

[0063] Multiple vertical rods 702 are fixedly provided on the upper end of the base plate 701, and multiple parallel placement plates 703 are fixedly provided on the vertical rods 702. The placement plates 703 are parallel to the base plate 701.

[0064] The upper surface of the base plate 701 forms a placement position, and the upper surface of the placement plate 703 forms a placement position.

[0065] The limiting assembly 8 includes a limiting plate 801. One end of the limiting plate 801 is fixedly provided with an inverted V-shaped boss 80101, and the other end is fixedly provided with a limiting post 802. The bottom plate 701 has a limiting groove 707 that matches the limiting post 802. The limiting plate 801 is installed inside the drying chamber. A compression spring 804 is provided between the limiting plate 801 and the bottom end of the drying chamber. The height of the limiting post 802 matches the height of the inverted V-shaped boss 80101. The inverted V-shaped boss 80101 is located away from the opening of the box 1.

[0066] The bottom of the base plate 701 has an installation groove 705. The bottom of the installation groove 705 is fixedly provided with a positioning tube 706. A pull rod 3 is provided inside the positioning tube 706. The pull rod 3 is set through the positioning tube 706 of all transport vehicles 7. The diameter of the pull rod 3 matches the inner diameter of the positioning tube 706. A paddle 301 is fixedly provided on the side wall of the pull rod 3. The paddle 301 is set along the length direction of the pull rod 3.

[0067] When the paddle 301 is set downwards, the lower end face of the paddle 301 is flush with the lower end face of the base plate 701.

[0068] When the paddle 301 is facing upwards or horizontally, the lower outer wall of the pull rod 3 is flush with the upper surface of the inverted V-shaped boss 80101.

[0069] The side wall of the positioning tube 706 has a notch 70601 that matches the paddle 301, and the notch 70601 is set parallel to the base plate 701.

[0070] The length of the lever 301 is greater than the distance between the positioning post and the top of the inverted V-shaped boss 80101.

[0071] The end face of the positioning tube 706 away from the opening has a positioning groove 70602 and a positioning groove 70603 that match the lever 301.

[0072] Positioning groove 1 70602 and positioning groove 2 70603 are both set perpendicular to the base plate 701. Positioning groove 1 70602 extends towards the base plate 701, and positioning groove 2 70603 extends away from the base plate 701.

[0073] The lower end of the limiting plate 801 is provided with multiple guide tubes 805, and the bottom end of the drying chamber is fixed with multiple guide rods 806, which are installed inside the guide tubes 805.

[0074] Compression spring 804 is installed on the outside of guide tube 805.

[0075] The lower end of the limiting plate 801 is fixed with multiple mounting posts 803. The outer side of the mounting posts 803 has external threads, and the inner side of the guide tube 805 near the mounting posts 803 has internal threads. The guide tube 805 is threadedly connected to the mounting posts 803. The height of the limiting plate 801 can be adjusted by rotating the guide posts.

[0076] An annular guide boss 80501 is fixedly provided on the inner side of one end of the guide tube 805 near the guide rod 806, and an annular limiting boss 80601 is fixedly provided on the outer side of the upper end of the guide rod 806. The inner diameter of the annular guide boss 80501 matches the outer diameter of the guide rod 806, and the diameter of the annular limiting boss 80601 matches the inner diameter of the guide tube 805. The guide rod 806 plays a guiding role during the up-and-down movement of the limiting plate 801, making its movement more stable.

[0077] The sealing door 2 has a through hole that matches the pull rod 3.

[0078] A method of using the above-mentioned high-efficiency rubber tire production oven includes the following steps:

[0079] S1. Align the lever 301 of the pull rod 3 with the notch 70601 that passes through the positioning tube 706 on the multiple transport vehicles 7, and rotate the pull rod 3 to align the lever 301 with the positioning groove 70603.

[0080] S2. Push the transport vehicle 7 and the pull rod 3 into the drying chamber (at this time, the trolleys are in contact with each other, and pushing the last transport vehicle 7 can make all the transport vehicles 7 enter the drying wall). The paddle 301 first contacts the inverted V-shaped boss 80101. Under the guidance of the upper surface of the inverted V-shaped boss 80101, the limiting plate 801 moves downward, and the limiting post 802 releases the limitation on the bottom plate 701. All the transport vehicles 7 move to the end of the box 1 away from the opening.

[0081] S3. Rotate the pull rod 3 to align the paddle 301 with the positioning groove 70602, and move the pull rod 3 towards the opening direction. The pull rod 3 drives the transport vehicle 7 to move towards the opening direction. Under the elastic force of the compression spring 804, when the limiting post 802 is aligned with the limiting groove 707, the limiting post 802 is inserted into the limiting groove 707 of the bottom plate 701 of the innermost transport vehicle 7 (i.e. the transport vehicle 7 furthest from the opening).

[0082] S4. Rotate the lever 3 to align the paddle 301 with the notch 70601. After the paddle 301 passes through the positioning tube 706 of the bottom plate 701 of the innermost transport vehicle 7, rotate the lever 3 again to align the paddle 301 with the positioning groove 70602 of the second transport vehicle 7 (i.e., the transport vehicle 7 adjacent to the innermost transport vehicle 7).

[0083] S5. Repeat steps S3-S4 until the limiting component 8 limits each of the transport vehicles 7. At this time, multiple transport vehicles 7 are arranged at equal intervals inside the drying chamber.

[0084] When all the transport vehicles 7 need to be pulled out, simply pass the lever 3 through the positioning tube 706 of all the transport vehicles 7, rotate the position of the lever 301 and the positioning groove 70603, and contact the innermost limiting post 802 to limit the transport vehicle 7. Then the innermost transport vehicle 7 can be pulled. After the innermost transport vehicle 7 contacts the inverted V-shaped protrusion 80101 corresponding to the second transport vehicle 7, the second transport vehicle 7 is released from the limit. In this way, all the transport vehicles 7 can be pulled out.

[0085] By rotating and pulling lever 3, the transport vehicle 7 can be positioned at equal intervals, which improves work efficiency and prevents personnel from being burned.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0087] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oven for rubber tire production, characterized by, include: Box (1), the box (1) is provided with a drying chamber, and the box (1) has an opening at one end; A sealing door (2) is hinged to the box body (1) at its upper end. The sealing door (2) is used to close the opening of the box body (1). The transport vehicle (7) is provided with a placement position for placing semi-finished tires, and there are multiple transport vehicles (7); The guide rail (6) is fixedly installed at the bottom of the inner side of the box (1), and the transport vehicle (7) is movably connected to the guide rail (6); A limiting assembly (8) is configured to position multiple transport vehicles (7) at equal intervals within the drying chamber; The transport vehicle (7) includes a base plate (701), and a roller (704) is fixedly provided at the lower end of the base plate (701). The roller (704) has an annular groove (70401) that matches the guide rail (6). The upper end of the base plate (701) is fixed with a plurality of vertical rods (702), and a plurality of parallel placement plates (703) are fixed on the vertical rods (702), and the placement plates (703) are parallel to the base plate (701); The upper surface of the base plate (701) forms a placement position, and the upper surface of the placement plate (703) forms a placement position; The limiting component (8) includes a limiting plate (801), one end of which is fixed with an inverted V-shaped boss (80101), and the other end is fixed with a limiting post (802). The bottom plate (701) has a limiting groove (707) that matches the limiting post (802). The limiting plate (801) is installed inside the drying chamber. A compression spring (804) is provided between the limiting plate (801) and the bottom end of the drying chamber. The height of the limiting post (802) matches the height of the inverted V-shaped boss (80101). The inverted V-shaped boss (80101) is located away from the opening of the box body (1). The bottom plate (701) has an installation groove (705) at its lower end. A positioning tube (706) is fixed at the bottom end of the installation groove (705). A pull rod (3) is provided inside the positioning tube (706). The pull rod (3) is installed through the positioning tubes (706) of all transport vehicles (7). The diameter of the pull rod (3) matches the inner diameter of the positioning tube (706). A paddle (301) is fixed on the side wall of the pull rod (3). The paddle (301) is installed along the length of the pull rod (3). When the lever (301) is set facing downwards, the lower end face of the lever (301) is flush with the lower end face of the base plate (701); When the lever (301) is facing upward or horizontally, the lower outer wall of the pull rod (3) is flush with the upper surface of the inverted V-shaped boss (80101); The positioning tube (706) has a notch (70601) on its side wall that matches the lever (301), and the notch (70601) is set parallel to the base plate (701). The length of the lever (301) is greater than the distance between the positioning post and the top of the inverted V-shaped boss (80101).

2. The oven for rubber tire production according to claim 1, characterized in that: An air inlet pipe (5) is fixedly provided at one end of the box (1) away from the opening. The air inlet pipe (5) is connected to the lower end of the drying chamber and the air outlet of the heater. The box body (1) is fixed with a return air pipe (4) near the opening. The return air pipe (4) is connected to the upper end of the drying chamber and to the air inlet of the heater.

3. The oven for rubber tire production according to claim 1, characterized in that: The positioning tube (706) has a positioning groove 1 (70602) and a positioning groove 2 (70603) that match the lever (301) on the end face away from the opening; The positioning groove one (70602) and positioning groove two (70603) are both set perpendicular to the base plate (701). The positioning groove one (70602) extends towards the base plate (701), and the positioning groove two (70603) extends away from the base plate (701).

4. The oven for rubber tire production according to claim 1, characterized in that: The lower end of the limiting plate (801) is provided with a plurality of guide tubes (805), and the bottom end of the drying chamber is fixedly provided with a plurality of guide rods (806), and the guide rods (806) are installed on the inner side of the guide tubes (805); The compression spring (804) is installed on the outside of the guide tube (805).

5. An oven for the production of rubber tyres according to claim 4, characterised in that: The lower end of the limiting plate (801) is fixed with a plurality of mounting posts (803). The outer side of the mounting post (803) is threaded, and the inner side of the guide tube (805) near the mounting post (803) is threaded. The guide tube (805) is threaded to the mounting post (803).

6. The oven for rubber tire production according to claim 4, characterized in that: An annular guide boss (80501) is fixedly provided on the inner side of one end of the guide tube (805) near the guide rod (806), and an annular limiting boss (80601) is fixedly provided on the outer side of the upper end of the guide rod (806). The inner diameter of the annular guide boss (80501) matches the outer diameter of the guide rod (806), and the diameter of the annular limiting boss (80601) matches the inner diameter of the guide tube (805).

7. The oven for rubber tire production according to claim 1, characterized in that: The sealing door (2) has a through hole that matches the pull rod (3).

8. A method of using the oven for producing a rubber tire according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Align the lever (301) of the pull rod (3) with the notch (70601) and pass through the positioning tube (706) on multiple transport vehicles (7), and rotate the pull rod (3) to align the lever (301) with the positioning groove (70603); S2. Push the transport vehicle (7) and pull rod (3) into the drying chamber. The paddle (301) first contacts the inverted V-shaped boss (80101). Under the guidance of the upper surface of the inverted V-shaped boss (80101), the limiting plate (801) moves downward and the limiting post (802) releases the limiting on the bottom plate (701). All transport vehicles (7) move to the end of the box (1) away from the opening. S3. Rotate the lever (3) to align the paddle (301) with the positioning groove (70602), move the lever (3) towards the opening direction, and the lever (3) will drive the transport vehicle (7) to move towards the opening direction. Under the elastic force of the compression spring (804), when the limiting post (802) is aligned with the limiting groove (707), the limiting post (802) will be inserted into the limiting groove (707) of the bottom plate (701) of the innermost transport vehicle (7). S4. Rotate the lever (3) to align the paddle (301) with the notch (70601). After the paddle (301) passes through the positioning tube (706) of the bottom plate (701) of the innermost transport vehicle (7), rotate the lever (3) again to align the paddle (301) with the positioning groove (70602) of the second transport vehicle (7). S5. Repeat steps S3-S4 until the transport vehicle (7) is limited by a limiting component (8) respectively.