Single-chip microcomputer classified storage box

By designing a microcontroller classification storage box with fixed components and ejection components, the problem that traditional storage boxes cannot conveniently remove and replace placement plates is solved, efficient storage and removal is achieved, costs are reduced, and practicality and protection are improved.

CN223396617UActive Publication Date: 2025-09-30SHENZHEN BOCHANGDA ELECTRONICS TECH CO LTD
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Patent Information

Application Number
CN202422671316.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-04
Publication Date
2025-09-30
Estimated Expiration
2034-11-04

AI Technical Summary

Technical Problem

Traditional MCU storage boxes cannot easily remove and replace the placement board specifications, resulting in low storage efficiency and high costs.

Method used

A microcontroller classification storage box is designed, which includes a fixing component and an ejection component. The fixing component can conveniently fix and replace the placement plate, and the ejection component can conveniently remove the microcontroller. Combined with a rubber contact pad and a drying frame, the fixing and protection effects are improved.

Benefits of technology

The efficiency of storing and taking out the single chip computer is improved, the cost is reduced, and the practicality and protection of the device are improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of single-chip microcomputers, in particular to a single-chip microcomputer classified storage box. Comprising a box body and further comprises a closing cover hinged to the outer portion of the box body. The fixing frame is fixedly connected to the interior of the box body, a plurality of mounting frames are fixedly connected to the inner wall of the fixing frame, mounting plates are arranged in the mounting frames, and a placement plate is fixedly connected between every two mounting plates. According to the utility model, through the arrangement of the fixing assembly, the mounting plate and the mounting frame can be conveniently fixed, so that a worker can conveniently replace the specification of the placement plate according to different types of single-chip microcomputer bodies, and the overall practicability of the device is effectively improved; the single-chip microcomputer body can be conveniently and effectively ejected, so that a worker can conveniently take out the single-chip microcomputer body, the taking-out efficiency of the single-chip microcomputer body is effectively improved, and time and labor are saved.
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Description

Technical Field

[0001] The utility model relates to the technical field of single-chip computers, in particular to a classification storage box for single-chip computers. Background Art

[0002] A single-chip microcomputer is an integrated circuit chip that uses ultra-large-scale integrated circuit technology to integrate a central processing unit CPU with data processing capabilities, multiple I / O ports and interrupt systems, read-only memory ROM, random access memory RAM, timer / counter and other functions into a single silicon chip to form a small but fully functional microcomputer system. When storing and processing single-chip microcomputers, a single-chip microcomputer classification storage box is required.

[0003] After storing the microcontroller, the traditional storage box cannot easily eject the microcontroller, which makes it difficult for the staff to easily take out the microcontroller, thereby reducing the efficiency of taking out and storing the microcontroller. In addition, the placement plate inside the traditional storage box and the box body are generally integrated. When storing the microcontroller, it is generally necessary to insert the pins at the bottom of the microcontroller into the guide groove on the upper surface of the placement plate. However, since the number and position of the bottom pins of different types of microcontrollers are also different, if the specifications of the placement plate cannot be replaced according to the number and position of the microcontroller pins, a storage box of one specification can only effectively store a microcontroller of one specification. When different types of microcontrollers need to be stored, storage boxes of different specifications need to be used, which not only reduces the storage efficiency of the microcontroller, but also increases the storage cost of the microcontroller and reduces the overall practicality of the storage box.

[0004] Therefore, those skilled in the art provide a single chip microcomputer classification storage box to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the utility model is to provide a single chip computer classification storage box, comprising a box body and further comprising:

[0006] a closing cover hingedly connected to the exterior of the box body;

[0007] A fixing frame is fixedly connected to the interior of the box body, and a plurality of mounting frames are fixedly connected to the inner wall of the fixing frame. A mounting plate is provided inside each of the mounting frames, and a placement plate is fixedly connected between every two of the mounting plates. The upper surfaces of the plurality of placement plates are provided with a single-chip computer body, and pins are provided on the outside of the single-chip computer body. The upper surface of the placement plate is provided with a guide groove for the pins to move;

[0008] A fixing assembly is provided inside the mounting plate and is used to fix the mounting plate and the mounting frame;

[0009] The ejection assembly is arranged inside the box body and is used to eject the pins and the microcontroller body, thereby making it easier for staff to take out the microcontroller body.

[0010] As a further improvement of the present technical solution, the fixing assembly includes an inner plate fixedly connected to the inside of the mounting plate, telescopic rods are symmetrically provided on the outside of the inner plate, the telescopic ends of the multiple telescopic rods are fixedly connected to the resistance plate, the outsides of the multiple resistance plates are fixedly connected to the insertion rods, the outsides of the multiple telescopic rods are sleeved with return springs, the multiple return springs are in contact between the resistance plate and the inner plate, and the outsides of the mounting plate and the mounting frame are provided with guide grooves for the movement of the insertion rods.

[0011] As a further improvement of the present technical solution, the ejection assembly includes a top plate located inside the box body, a protective pad is bonded to the upper surface of the top plate, a plurality of damping rods are fixedly connected to the inner bottom end of the box body, the telescopic ends of the plurality of damping rods are fixedly connected to the bottom of the top plate, the outsides of the plurality of damping rods are sleeved with interference springs, the plurality of interference springs are in contact between the top plate and the box body, connecting plates are symmetrically provided on both sides of the outer wall of the top plate, the other sides of each two connecting plates are fixedly connected to a movable plate, and guide grooves for the movement of the connecting plates are provided on both sides of the outer wall of the box body. The outside of the plate is fixedly connected to a fixed plate, the inside of the fixed plate is fixedly connected to a sliding rod, the inside of the fixed plate is provided with a slide plate, the inside of the slide plate is provided with a guide groove for the sliding rod to move, the outside of the slide rod is sleeved with a connecting spring, the connecting spring is in contact between the slide and the fixed plate, one side of the slide is symmetrically provided with connecting rods, the other end of each two connecting rods is fixedly connected to a pulling plate, and the other side of the slide is symmetrically provided with a fixing rod, the contact surface of the fixed plate and the movable plate is provided with a guide groove for the movement of the fixing rod, and both sides of the outer wall of the box body are provided with guide grooves for the movement of the fixing rod.

[0012] As a further improvement of the present technical solution, a plurality of rubber contact pads are fixedly connected to the inner top end of the closing cover.

[0013] As a further improvement of the present technical solution, the inner top end of the closing cover is fixedly connected to a placement frame, and the outer portion of the placement frame is fixedly connected to a drying frame via bolts.

[0014] As a further improvement of the present technical solution, the front end surface of the closing cover is fixedly connected to an L-shaped plate, the front end surface of the box body is fixedly connected to a positioning frame, the upper surface of the positioning frame is provided with a guide groove for the movement of the L-shaped plate, the front end surface of the positioning frame is fixedly connected to a fixed sleeve, the interior of the fixed sleeve is provided with an inner rod, one end of the inner rod is fixedly connected to a pull plate, the outside of the inner rod is fixedly connected to a resistance plate, the outer sleeve of the inner rod is provided with an installation spring, the installation spring is in contact between the resistance plate and the fixed sleeve, the contact surfaces of the fixed sleeve and the positioning frame are both provided with guide grooves for the movement of the inner rod, and the interior of the L-shaped plate is provided with a guide groove for the movement of the inner rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the single-chip computer classification storage box, by providing a fixing component and an ejecting component, when the single-chip computer body needs to be stored, it is only necessary to first fix the mounting plate and the mounting frame by the fixing component. When the mounting plate and the mounting frame are fixed, the placement plate can be fixed and installed. At this time, the pins at the bottom of the single-chip computer body are plugged into the guide grooves on the upper surface of the placement plate to fix the single-chip computer body. When the single-chip computer body is fixed, the closing cover is closed. At this time, the single-chip computer body can be stored. When it is necessary to move the single-chip computer body according to the guide grooves at the bottom of the single-chip computer body, the single-chip computer body can be fixed. When the specifications of the placement plate are changed according to the number and position of the pins, the mounting plate and the mounting frame can be easily disassembled through the fixing components, which makes it convenient for the staff to change the specifications of the placement plate and effectively improves the overall practicality of the device. When the MCU body needs to be taken out, the pin part of the MCU body can be easily and effectively ejected through the ejection component, so that the MCU body can be ejected, which makes it convenient for the staff to take out the MCU body, effectively improving the efficiency of taking out the MCU body and saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model after the closing cover is opened;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention after the placement plate and the single-chip computer body are disassembled;

[0020] Figure 4 This is a schematic diagram of the cutaway three-dimensional structure of the box body and the fixing plate in the present invention;

[0021] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of area A in the middle;

[0022] Figure 6 for Figure 3 Schematic diagram of the enlarged structure of the middle B area;

[0023] Figure 7 for Figure 4 Schematic diagram of the enlarged structure of the middle C region;

[0024] Figure 8 for Figure 4 Schematic diagram of the enlarged structure of the D area in the middle.

[0025] The meaning of each number in the figure is:

[0026] 1. Box body; 2. Closing cover; 3. L-shaped plate; 4. Positioning frame; 5. Fixed sleeve; 6. Moving plate; 7. Fixed plate; 8. Rubber contact pad; 9. Placement frame; 10. Drying frame; 11. Placement plate; 12. Mounting plate; 13. Mounting frame; 14. Microcontroller body; 15. Pins; 16. Top plate; 17. Connecting plate; 18. Inner rod; 19. Contact plate; 20. Mounting spring; 21. Inner plate; 22. Telescopic rod; 23. Contact plate; 24. Insert rod; 25. Reset spring; 26. Damping rod; 27. Contact spring; 28. Sliding rod; 29. ​​Slide plate; 30. Connecting spring; 31. Connecting rod; 32. Fixed rod; 33. Fixed frame. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1 - Figure 8 As shown, this embodiment provides a single chip computer classification storage box, including a box body 1, and further comprising:

[0029] A closing cover 2 is hinged to the outside of the box body 1;

[0030] A fixing frame 33 is fixedly connected to the interior of the box body 1. A plurality of mounting frames 13 are fixedly connected to the inner wall of the fixing frame 33. A mounting plate 12 is provided inside each of the plurality of mounting frames 13. A placement plate 11 is fixedly connected between each two mounting plates 12. A single-chip computer body 14 is provided on the upper surface of each of the placement plates 11. A pin 15 is provided on the outside of the single-chip computer body 14. A guide groove for the pin 15 to move is provided on the upper surface of the placement plate 11.

[0031] A fixing assembly is provided inside the mounting plate 12 and is used to fix the mounting plate 12 and the mounting frame 13;

[0032] The ejection assembly is arranged inside the box body 1 and is used to eject the pins 15 and the microcontroller body 14 , thereby making it easier for staff to take out the microcontroller body 14 .

[0033] The above working principle is: when the single-chip computer body 14 needs to be stored, it is only necessary to fix the mounting plate 12 and the mounting frame 13 by fixing the mounting plate 12 and the mounting frame 13. When the mounting plate 12 and the mounting frame 13 are fixed, the placement plate 11 can be fixed and installed. At this time, the pins 15 at the bottom of the single-chip computer body 14 are plugged into the guide grooves on the upper surface of the placement plate 11 to fix the single-chip computer body 14. When the single-chip computer body 14 is fixed, the closing cover 2 is closed. At this time, the single-chip computer body 14 can be stored. When it is necessary to adjust the number of pins 15 at the bottom of the single-chip computer body 14 and the position of the pins 15, the single-chip computer body 14 can be fixed. When the specifications of the placement plate 11 are replaced, the mounting plate 12 and the mounting frame 13 can be conveniently disassembled through the fixing assembly, which makes it convenient for the staff to replace the specifications of the placement plate 11, effectively improving the overall practicality of the device. When the microcontroller body 14 needs to be removed, the pins 15 of the microcontroller body 14 can be conveniently and effectively ejected through the ejection assembly, so that the microcontroller body 14 can be ejected, which makes it convenient for the staff to remove the microcontroller body 14, effectively improving the removal efficiency of the microcontroller body 14, saving time and effort.

[0034] In order to conveniently and effectively fix and install the placement plate 11, the fixing assembly includes an inner plate 21 fixedly connected to the inside of the mounting plate 12, and telescopic rods 22 are symmetrically provided on the outside of the inner plate 21. The telescopic ends of the multiple telescopic rods 22 are fixedly connected to the resistance plates 23, and the outsides of the multiple resistance plates 23 are fixedly connected to the insertion rods 24. The outsides of the multiple telescopic rods 22 are all sleeved with return springs 25, and the multiple return springs 25 are in contact between the resistance plates 23 and the inner plate 21. The outsides of the mounting plate 12 and the mounting frame 13 are provided with guide grooves for the movement of the insertion rods 24. When the placement plate 11 needs to be fixed and installed, it is only necessary to press the insertion rods 24 first. At this time, the insertion rods 24 will drive the resistance plates 23 to move synchronously, and the resistance plates 23 then squeezes the telescopic rod 22 and the return spring 25 synchronously, and then the mounting plate 12 is plugged into the inside of the mounting frame 13, and the mounting plate 12 will drive the insertion rod 24 to move synchronously. When the mounting plate 12 drives the insertion rod 24 to move into the guide groove outside the mounting frame 13, the return spring 25 is reset, driving the contact plate 23 to move synchronously, and the contact plate 23 then drives the insertion rod 24 to move synchronously. When the insertion rod 24 is plugged into the guide groove outside the mounting frame 13, the mounting plate 12 and the mounting frame 13 can be fixed. At this time, the placement plate 11 can be fixed and installed, and it can also be convenient for the staff to disassemble and replace the placement plate 11 according to actual needs, effectively improving the overall practicality of the device.

[0035] Taking into account that the single-chip computer body 14 needs to be ejected to a certain position before being taken out, the ejection assembly includes a top plate 16 located inside the box body 1, and a protective pad is bonded to the upper surface of the top plate 16. The inner bottom end of the box body 1 is fixedly connected to a plurality of damping rods 26, and the telescopic ends of the plurality of damping rods 26 are fixedly connected to the bottom of the top plate 16. The outsides of the plurality of damping rods 26 are all sleeved with interference springs 27, and the plurality of interference springs 27 are all in contact between the top plate 16 and the box body 1. Connecting plates 17 are symmetrically provided on both sides of the outer wall of the top plate 16, and the other side of each two connecting plates 17 is fixedly connected to a movable plate 6. Guide grooves for the movement of the connecting plates 17 are provided on both sides of the outer wall of the box body 1, and the outsides of the two movable plates 6 are fixedly connected There is a fixed plate 7, the interior of the fixed plate 7 is fixedly connected with a slide bar 28, the interior of the fixed plate 7 is provided with a slide plate 29, the interior of the slide plate 29 is provided with a guide groove for the slide bar 28 to move, the outer sleeve of the slide bar 28 is provided with a connecting spring 30, the connecting spring 30 is in contact between the slide plate 29 and the fixed plate 7, one side of the slide plate 29 is symmetrically provided with a connecting rod 31, the other end of each two connecting rods 31 are fixedly connected with a pull plate, and the other side of the slide plate 29 is symmetrically provided with a fixing rod 32, the contact surface of the fixed plate 7 and the movable plate 6 is provided with a guide groove for the fixing rod 32 to move, and the outer wall of the box body 1 has guide grooves for the fixing rod 32 to move. When the single-chip computer body 14 needs to be stored and processed, it is only necessary to pull the pull plate first. At this time, the pull plate will drive the connecting rod 31 to move simultaneously When the sliding plate 29 moves to the guide grooves on both sides of the outer wall of the box body 1, the connecting rod 31 drives the sliding plate 29 to move synchronously. In the process of the sliding plate 29 moving, the connecting spring 30 is squeezed, and the sliding plate 29 also drives the fixing rod 32 to move synchronously. When the fixing rod 32 is out of the guide grooves on both sides of the outer wall of the box body 1, the moving plate 6 is pressed downward. At this time, the moving plate 6 drives the connecting plate 17 to move synchronously, and the connecting plate 17 drives the top plate 16 to move synchronously. In the process of the top plate 16 moving downward, the damping rod 26 and the resistance spring 27 are squeezed synchronously. When the fixing rod 32 moves to the guide grooves on both sides of the outer wall of the box body 1 close to the bottom, the pull plate is released. At this time, the connecting spring 30 is reset, driving the sliding plate 29 to move synchronously, and the sliding plate 29 is The fixing rods 32 are driven to move synchronously. When the fixing rods 32 are inserted into the guide grooves on both sides of the outer wall of the box body 1, the position of the top plate 16 can be fixed. At this time, the single-chip computer body 14 can be stored. When the single-chip computer body 14 needs to be taken out, it is only necessary to pull the pull plate first. At this time, the pull plate will drive the slide plate 29 and the fixing rods 32 to move synchronously. When the fixing rods 32 are out of the guide grooves on both sides of the outer wall of the box body 1, the resistance spring 27 is reset, driving the top plate 16 to move synchronously. At this time, the pins 15 of the single-chip computer body 14 can be ejected through the top plate 16, so that the single-chip computer body 14 can be ejected, which makes it easier for the staff to disassemble the single-chip computer body 14. By setting the protective pad,It can effectively protect the pin 15, thereby preventing the top plate 16 from damaging the pin 15.

[0036] In order to effectively improve the fixing effect of the microcontroller body 14, a plurality of rubber contact pads 8 are fixedly connected to the inner top of the closing cover 2. When the pins 15 at the bottom of the microcontroller body 14 are inserted into the guide grooves on the upper surface of the placement plate 11, the closing cover 2 is closed. At this time, the closing cover 2 will drive the rubber contact pads 8 to move synchronously. When the closing cover 2 is completely closed, the rubber contact pads 8 will contact the outside of the microcontroller body 14. At this time, the rubber contact pads 8 can effectively improve the fixing effect of the microcontroller body 14 and at the same time can provide a certain protection for the microcontroller body 14.

[0037] In order to effectively improve the dryness inside the box body 1 and prevent the microcontroller body 14 from getting damp, a placement frame 9 is fixedly connected to the top of the inner side of the closing cover 2, and a drying frame 10 is fixedly connected to the outside of the placement frame 9 by bolts. When the dryness inside the box body 1 needs to be improved, it is only necessary to first put a desiccant into the placement frame 9, and then fix the drying frame 10 to the placement frame 9 by bolts, and then close the closing cover 2. At this time, the desiccant can effectively improve the dryness inside the box body 1, thereby preventing the microcontroller body 14 from getting damp.

[0038] In addition, in order to effectively fix the closing cover 2, the front end surface of the closing cover 2 is fixedly connected with an L-shaped plate 3, the front end surface of the box body 1 is fixedly connected with a positioning frame 4, the upper surface of the positioning frame 4 is provided with a guide groove for the movement of the L-shaped plate 3, and the front end surface of the positioning frame 4 is fixedly connected with a fixing sleeve 5. The interior of the fixing sleeve 5 is provided with an inner rod 18, one end of the inner rod 18 is fixedly connected with a pull plate, and the outside of the inner rod 18 is fixedly connected with a contact plate 19. The outer sleeve of the inner rod 18 is provided with a mounting spring 20, which is in contact with the contact plate 19 and the fixing sleeve 5. The contact surfaces of the fixing sleeve 5 and the positioning frame 4 are both provided with guide grooves for the movement of the inner rod 18. The interior of the L-shaped plate 3 is provided with a pull plate for the movement of the inner rod 18. When the inner rod 18 is inserted into the guide groove inside the L-shaped plate 3, the positioning frame 4 and the L-shaped plate 3 can be fixed, and the closing cover 2 can be fixed at this time.

[0039] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A single chip computer classification storage box, comprising a box body (1), characterized in that: Also includes: a closing cover (2) hingedly connected to the outside of the box body (1); A fixed frame (33) is fixedly connected to the interior of the box body (1); a plurality of mounting frames (13) are fixedly connected to the inner wall of the fixed frame (33); a mounting plate (12) is provided inside each of the plurality of mounting frames (13); a placement plate (11) is fixedly connected between each two of the mounting plates (12); a single-chip computer body (14) is provided on the upper surface of each of the plurality of placement plates (11); a pin (15) is provided on the outside of the single-chip computer body (14); and a guide groove for the pin (15) to move is provided on the upper surface of the placement plate (11); A fixing assembly is arranged inside the mounting plate (12) and is used to fix the mounting plate (12) and the mounting frame (13); The ejection assembly is arranged inside the box body (1) and is used to eject the pins (15) and the single-chip computer body (14), thereby facilitating the removal of the single-chip computer body (14) by a worker.

2. The single chip computer classification storage box according to claim 1, characterized in that: The fixing assembly includes an inner plate (21) fixedly connected to the inside of the mounting plate (12), telescopic rods (22) are symmetrically provided on the outside of the inner plate (21), the telescopic ends of the plurality of telescopic rods (22) are fixedly connected to the contact plates (23), the outsides of the plurality of contact plates (23) are fixedly connected to the insertion rods (24), the outsides of the plurality of telescopic rods (22) are sleeved with reset springs (25), the plurality of reset springs (25) are in contact between the contact plates (23) and the inner plate (21), and the outsides of the mounting plate (12) and the mounting frame (13) are provided with guide grooves for the movement of the insertion rods (24).

3. The single chip computer classification storage box according to claim 1, characterized in that: The ejection assembly includes a top plate (16) located inside the box body (1), a protective pad is bonded to the upper surface of the top plate (16), a plurality of damping rods (26) are fixedly connected to the bottom end of the box body (1), the telescopic ends of the plurality of damping rods (26) are fixedly connected to the bottom of the top plate (16), the outsides of the plurality of damping rods (26) are sleeved with a resistance spring (27), the plurality of resistance springs (27) are in resistance between the top plate (16) and the box body (1), connecting plates (17) are symmetrically provided on both sides of the outer wall of the top plate (16), the other side of each two connecting plates (17) is fixedly connected to a movable plate (6), the outer walls of the box body (1) are provided with guide grooves for the connecting plates (17) to move, and the outsides of the two movable plates (6) are fixedly connected to fixed plates (7), a sliding rod (28) is fixedly connected to the interior of the fixed plate (7), a slide plate (29) is provided inside the fixed plate (7), a guide groove for the movement of the sliding rod (28) is provided inside the slide plate (29), a connecting spring (30) is sleeved on the outside of the sliding rod (28), the connecting spring (30) is in contact between the slide plate (29) and the fixed plate (7), a connecting rod (31) is symmetrically provided on one side of the slide plate (29), the other end of each two connecting rods (31) is fixedly connected to a pulling plate, a fixed rod (32) is symmetrically provided on the other side of the slide plate (29), the contact surface of the fixed plate (7) and the movable plate (6) is provided with a guide groove for the movement of the fixed rod (32), and guide grooves for the movement of the fixed rod (32) are provided on both sides of the outer wall of the box body (1).

4. The single chip computer classification storage box according to claim 1, characterized in that: A plurality of rubber abutment pads (8) are fixedly connected to the inner top end of the closing cover (2).

5. The single chip computer classification storage box according to claim 1, characterized in that: The inner top end of the closing cover (2) is fixedly connected to a placement frame (9), and the outer portion of the placement frame (9) is fixedly connected to a drying frame (10) via bolts.

6. The single chip computer classification storage box according to claim 1, characterized in that: The front end surface of the closing cover (2) is fixedly connected with an L-shaped plate (3), the front end surface of the box body (1) is fixedly connected with a positioning frame (4), the upper surface of the positioning frame (4) is provided with a guide groove for the L-shaped plate (3) to move, the front end surface of the positioning frame (4) is fixedly connected with a fixing sleeve (5), the interior of the fixing sleeve (5) is provided with an inner rod (18), one end of the inner rod (18) is fixedly connected with a pull plate, the outside of the inner rod (18) is fixedly connected with a contact plate (19), the outside of the inner rod (18) is sleeved with a mounting spring (20), the mounting spring (20) is in contact between the contact plate (19) and the fixing sleeve (5), the contact surface of the fixing sleeve (5) and the positioning frame (4) are both provided with a guide groove for the inner rod (18) to move, and the interior of the L-shaped plate (3) is provided with a guide groove for the inner rod (18) to move.