Coal anti-crushing device based on graded impact buffering
The coal anti-breakage device with graded impact buffering utilizes the synergistic effect of components such as arc sleeves, arc rods, springs, rollers, and air bladders to solve the problem of coal breakage caused by impact or bumps during transportation, thus achieving stable transportation and convenient unloading.
Patent Information
- Application Number
- CN202511256583.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2025-11-14
AI Technical Summary
Existing coal transportation equipment fails to effectively prevent coal from breaking due to impacts or bumps during transportation, resulting in inconvenience in unloading and use.
The coal anti-breakage device with graded impact buffering includes a first buffer mechanism, a second buffer mechanism, and an internal anti-collision mechanism. Through the synergistic action of components such as arc-shaped sleeves, arc-shaped rods, springs, rollers, air bladders, and threaded columns, it achieves multi-level buffering and anti-collision, reducing the probability of coal breakage.
It effectively reduces the probability of coal breakage during transportation, maintains transportation stability, avoids large-area collision damage, and facilitates unloading and use.
Smart Images
Figure CN120942765A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of coal technology, and in particular relates to a coal anti-breakage device based on graded impact buffer. Background Technology
[0002] After being mined, coal is transported to different places through various means. Existing transportation equipment does not pay attention to the anti-breakage effect during the transportation process, resulting in a large amount of coal being broken due to impacts or bumps after transportation. The subsequent unloading and use of broken coal is quite troublesome. Summary of the Invention
[0003] The purpose of this invention is to solve the problem that coal is often broken due to impact or bumps during transportation, and the subsequent unloading and use of broken coal is troublesome. Therefore, this invention proposes a coal anti-breakage device based on graded impact buffering.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A coal anti-crushing device based on graded impact buffering includes a storage box, a door on the outer surface of the storage box, a positioning mechanism on the outside of the storage box, the positioning mechanism being located inside a first buffer mechanism, the first buffer mechanism being located inside a second buffer mechanism, and an internal anti-collision mechanism being located inside the storage box.
[0006] As a further description of the above technical solution:
[0007] The first buffer mechanism includes a connecting block, with two arc-shaped sleeves fixedly connected to the lower surface of the connecting block. An arc-shaped rod is slidably connected inside the arc-shaped sleeves, and the arc-shaped rod is fixedly connected to an arc-shaped groove opened inside the arc-shaped shell.
[0008] As a further description of the above technical solution:
[0009] Two first springs are sleeved on the outer side of the arc-shaped rod. The opposite ends of the two first springs are fixedly connected to the front and rear sides of the arc-shaped sleeve, respectively, and the far ends of the two first springs are fixedly connected to the front and rear sides of the arc-shaped groove, respectively.
[0010] As a further description of the above technical solution:
[0011] The lower surface of the storage box is fixedly connected to multiple rollers, which are arranged symmetrically in two rows.
[0012] As a further description of the above technical solution:
[0013] The positioning mechanism includes a U-shaped frame fixedly connected to the outside of the storage box. The U-shaped frame is hollow inside. A first trapezoidal block is provided on the upper side inside the U-shaped frame. Two limiting grooves are opened on the upper surface of the first trapezoidal block. Limiting rods are provided in the limiting grooves. The top of the limiting rods is fixedly connected to the upper surface of the inner wall of the U-shaped frame. A pressing block is fixedly connected to the lower surface of the first trapezoidal block. The pressing block extends through to the outside of the U-shaped frame.
[0014] As a further description of the above technical solution:
[0015] The first trapezoidal block has a second trapezoidal block attached to both its left and right sides. The two second trapezoidal blocks are fixedly connected to the opposite surfaces of each other with a first sliding rod. A first sliding sleeve is fitted on the outside of the first sliding rod. A fixing plate is snapped onto the outside of the first sliding sleeve. The fixing plate is fixedly connected inside the trapezoidal block. A second spring is fitted on the outside of the first sliding rod. The two ends of the second spring are fixedly connected to the opposite surfaces of the second trapezoidal block and the second sliding sleeve, respectively.
[0016] As a further description of the above technical solution:
[0017] Side plates are fixedly connected to the far ends of the two first sliding rods. The side plates are set inside the U-shaped frame. The left and right sides of the U-shaped frame are provided with first through holes. The side plates are provided with second through holes corresponding to the first through holes. The bottom end of the side plate passes through a third through hole opened on the lower surface of the U-shaped frame. Connecting plates are fixedly connected to the opposite surfaces of the two side plates. Multiple insert rods are fixedly connected to the opposite surfaces of the two connecting plates. The insert rods pass through the rectangular sleeve and are inserted into the rod groove opened on the outer surface of the connecting block.
[0018] As a further description of the above technical solution:
[0019] The internal anti-collision mechanism includes two circular plates on the left and right sides of the storage box. Airbags are fixedly connected to the opposite surfaces of the two circular plates. The two airbags are fixedly connected to the left and right sides of the storage box respectively. The two airbags are connected by multiple anti-collision elastic air cylinders, which are installed inside the storage box.
[0020] As a further description of the above technical solution:
[0021] The two circular plates are each fitted with a threaded cap on their opposite sides. The threaded caps are internally threaded with threaded posts. The opposite ends of the two threaded posts are fixedly connected with screw blocks. The threaded posts pass through the first through hole and the second through hole. The opposite ends of the two threaded posts are fixedly connected with a rotating shaft. The outer side of the rotating shaft is fitted with a bearing. The two bearings are respectively fitted on the left and right sides of the storage box. The opposite sides of the two circular plates are each fixedly connected with a telescopic rod. One end of the telescopic rod is fixedly connected to one side of the storage box.
[0022] As a further description of the above technical solution:
[0023] The second buffer mechanism includes a slider fixedly connected to the lower surface of the storage box. The slider is slidably connected to a groove opened on the lower surface of the transport box. Two second sliding rods symmetrically arranged are fixedly connected to the front and rear sides of the slider. The second sliding rods pass through a second sliding sleeve that is snapped into one side of the storage box. A third spring is sleeved on the outer side of the second sliding rod. The two ends of the third spring are fixedly connected to the opposite surfaces of the second sliding sleeve and the slider, respectively.
[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0025] 1. In this invention, by setting a first buffer mechanism, when the device receives an impact, the impact force will affect the storage box. The storage box can drive the arc sleeve to move along the arc rod. Combined with the elastic force of the first spring, the shaking of the storage box can be buffered to a great extent. When the storage box shakes, it can drive the roller to roll in the arc shell, which can maintain the stability of the storage box. By setting a second buffer mechanism, when the impact force affects the storage box, the arc shell will also be affected. At this time, the arc shell can shake and drive the slider to slide in the slide groove. The slider can drive the second slide rod to slide in the second slide sleeve, and can be buffered by the elastic force of the second spring. Through the purpose of graded buffering, the probability of coal breakage can be greatly reduced.
[0026] 2. In this invention, by setting an internal anti-collision mechanism, when a large amount of coal is stored in the storage box, the screw block can rotate when it is turned. Under the action of the telescopic rod, the threaded cap can drive the circular plate to move. The movement of the circular plate can compress the air bladder. When the air bladder is compressed, the air inside can be discharged into multiple anti-collision elastic air cylinders. At this time, the anti-collision elastic air cylinders are in an expanded state. The expansion of multiple anti-collision elastic air cylinders can expand the anti-collision area inside the storage box, thus avoiding large-area collision damage to the coal during transportation.
[0027] 3. In this invention, by setting a positioning mechanism, when it is necessary to remove the storage box to load or unload coal, controlling the pressing block to move upward can drive the first trapezoidal block to move upward. The first trapezoidal block can squeeze the two second trapezoidal blocks. The two second trapezoidal blocks respectively drive the two side plates to move away from each other through the two first sliding rods. The two side plates moving away from each other respectively drive the two connecting plates to move away from each other. The connecting plates drive the insert rod to move away from the rod groove. At this time, the rectangular sleeve and the connecting block are no longer fixed together. At this time, the storage box is no longer fixed. Therefore, the storage box can be taken out from the arc-shaped shell through the U-shaped frame. Attached Figure Description
[0028] Figure 1 This is a three-dimensional structural diagram of a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0029] Figure 2This is a side view of the cross-sectional structure of a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0030] Figure 3 This is a three-dimensional structural diagram of the U-shaped frame in a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0031] Figure 4 This is a three-dimensional structural diagram of the internal anti-collision mechanism in a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0032] Figure 5 This is a frontal cross-sectional view of the positioning mechanism in a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0033] Figure 6 This is a three-dimensional structural diagram of the connecting plate and insert rod in a coal anti-breakage device based on graded impact buffer proposed in this invention.
[0034] Legend:
[0035] 1. Storage box; 2. Box door; 3. First buffer mechanism; 31. Arc-shaped shell; 32. Arc-shaped sleeve; 33. First spring; 34. Arc-shaped rod; 35. Roller; 36. Connecting block; 4. Positioning mechanism; 41. U-shaped frame; 42. Pressing block; 43. First trapezoidal block; 44. Limiting rod; 45. Second trapezoidal block; 46. Second spring; 47. Fixing plate; 48. First sliding rod; 49. Side plate; 410. 411. First through hole; 412. Second through hole; 413. Third through hole; 414. Rectangular sleeve; 415. Connecting plate; 416. Insert rod; 5. Internal anti-collision mechanism; 51. Circular plate; 52. Airbag; 53. Threaded column; 54. Tightening block; 55. Telescopic rod; 56. Rotating shaft; 57. Anti-collision elastic air cylinder; 6. Second buffer mechanism; 61. Transport box; 62. Second slide rod; 63. Third spring; 64. Slider. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] Please see Figure 1-6This invention provides a technical solution: a coal anti-crushing device based on graded impact buffering, comprising a storage box 1, a door 2 on the outer surface of the storage box 1, and a positioning mechanism 4 on the outer side of the storage box 1. The positioning mechanism 4 includes a U-shaped frame 41 fixedly connected to the outer side of the storage box 1. The U-shaped frame 41 is hollow inside, and a first trapezoidal block 43 is provided on the upper side inside the U-shaped frame 41. Two limiting grooves are formed on the upper surface of the first trapezoidal block 43, and limiting rods 44 are provided in the limiting grooves. The top of the limiting rods 44 is fixedly connected to the upper surface of the inner wall of the U-shaped frame 41. A pressing block 42 is fixedly connected to the lower surface of the first trapezoidal block 43, and the pressing block 42 extends to the outer side of the U-shaped frame 41. Second trapezoidal blocks 45 are attached to both the left and right sides of the first trapezoidal block 43. First sliding rods 48 are fixedly connected to the far sides of the two second trapezoidal blocks 45. A first sliding sleeve is fitted, and a fixing plate 47 is snapped onto the outside of the first sliding sleeve. The fixing plate 47 is fixedly connected inside the trapezoidal block. A second spring 46 is fitted onto the outside of the first sliding rod 48. The two ends of the second spring 46 are fixedly connected to the opposite surfaces of the second trapezoidal block 45 and the second sliding sleeve, respectively. Side plates 49 are fixedly connected to the far ends of the two first sliding rods 48. The side plates 49 are set inside the U-shaped frame 41. A first through hole 410 is opened on both the left and right sides of the U-shaped frame 41. A second through hole 411 is opened on the side plate 49 corresponding to the position of the first through hole 410. The bottom end of the side plate 49 passes through a third through hole 413 opened on the lower surface of the U-shaped frame 41. A connecting plate 415 is fixedly connected to the opposite surfaces of the two side plates 49. Multiple insert rods 416 are fixedly connected to the opposite surfaces of the two connecting plates 415. The insert rods 416 pass through the rectangular sleeve 414 and are snapped into the rod groove opened on the outer surface of the connecting block 36.
[0038] In this embodiment, by setting the positioning mechanism 4, when it is necessary to remove the storage box 1 to load or unload coal, the control of the pressing block 42 to move upward can drive the first trapezoidal block 43 to move upward. The first trapezoidal block 43 can squeeze the two second trapezoidal blocks 45. The two second trapezoidal blocks 45 respectively drive the two side plates 49 to move away from each other through the two first sliding rods 48. The two side plates 49 moving away from each other respectively drive the two connecting plates 415 to move away from each other. The connecting plate 415 drives the insertion rod 416 to move away from the rod groove. At this time, the rectangular sleeve 414 and the connecting block 36 are no longer fixed together. At this time, the storage box 1 is no longer fixed. Therefore, the storage box 1 can be taken out from the arc shell 31 through the U-shaped frame 41.
[0039] The positioning mechanism 4 is set inside the first buffer mechanism 3. The first buffer mechanism 3 includes a connecting block 36. Two arc-shaped sleeves 32 are fixedly connected to the lower surface of the connecting block 36. An arc-shaped rod 34 is slidably connected inside the arc-shaped sleeve 32. The arc-shaped rod 34 is fixedly connected to the arc-shaped groove opened inside the arc-shaped shell 31. Two first springs 33 are sleeved on the outer side of the arc-shaped rod 34. The opposite ends of the two first springs 33 are fixedly connected to the front and rear sides of the arc-shaped sleeve 32, respectively. The far ends of the two first springs 33 are fixedly connected to the front and rear sides of the arc-shaped groove, respectively. Multiple rollers 35 are fixedly connected to the lower surface of the storage box 1. The multiple rollers 35 are arranged in two rows symmetrically on the left and right.
[0040] In this embodiment, by setting the first buffer mechanism 3, when the device receives an impact, the impact force will affect the storage box 1. The storage box 1 can drive the arc sleeve 32 to move along the arc rod 34. In addition, the elastic force of the first spring 33 can greatly buffer the shaking of the storage box 1. When the storage box 1 shakes, it can drive the roller 35 to roll in the arc shell 31, which can maintain the stability of the storage box 1.
[0041] The first buffer mechanism 3 is disposed within the second buffer mechanism 6. The second buffer mechanism 6 includes a slider 64 fixedly connected to the lower surface of the storage box 1. The slider 64 is slidably connected to a groove opened on the lower surface of the transport box 61. Two second sliding rods 62 are fixedly connected to the front and rear sides of the slider 64, which are arranged symmetrically. The second sliding rods 62 pass through a second sliding sleeve that is snapped into one side of the storage box 1. A third spring 63 is sleeved on the outer side of the second sliding rod 62. The two ends of the third spring 63 are fixedly connected to the opposite surfaces of the second sliding sleeve and the slider 64, respectively.
[0042] In this embodiment, by setting the second buffer mechanism 6, when the impact force affects the storage box 1, the arc-shaped shell 31 will also be affected. At this time, the arc-shaped shell 31 can shake and drive the slider 64 to slide in the slide groove. The slider 64 can drive the second slide rod 62 to slide in the second slide sleeve, and can be buffered by the elastic force of the second spring 46 when it contracts.
[0043] The storage box 1 is equipped with an internal anti-collision mechanism 5. The internal anti-collision mechanism 5 includes two circular plates 51 disposed on the left and right sides of the storage box 1. Airbags 52 are fixedly connected to the opposite surfaces of the two circular plates 51. The two airbags 52 are fixedly connected to the left and right sides of the storage box 1 respectively. The two airbags 52 are connected to each other through multiple anti-collision elastic air cylinders 57. The anti-collision elastic air cylinders 57 are disposed inside the storage box 1. Threaded caps are snapped onto the opposite surfaces of the two circular plates 51. Threaded posts 53 are threadedly connected to the inner threads of the threaded caps. Tightening blocks 54 are fixedly connected to the far ends of the two threaded posts 53. The threaded posts 53 pass through the first through hole 410 and the second through hole 411. Rotating shafts 56 are fixedly connected to the opposite ends of the two threaded posts 53. Bearings are sleeved on the outer side of the rotating shafts 56. The two bearings are snapped onto the left and right sides of the storage box 1 respectively. Telescopic rods 55 are fixedly connected to the opposite surfaces of the two circular plates 51. One end of the telescopic rod 55 is fixedly connected to one side of the storage box 1.
[0044] In this embodiment, by setting an internal anti-collision mechanism 5, when a large amount of coal is stored in the storage box 1, the screw block 54 can rotate, which can drive the threaded column 53 to rotate. Under the action of the telescopic rod 55, the threaded cap can drive the circular plate 51 to move. The movement of the circular plate 51 can compress the airbag 52. When the airbag 52 is compressed, the air inside can be discharged into multiple anti-collision elastic air cylinders 57. At this time, the anti-collision elastic air cylinders 57 are in an expanded state. The expansion of multiple anti-collision elastic air cylinders 57 can expand the anti-collision area inside the storage box 1, avoiding large-area collision damage to the coal during transportation.
[0045] Working Principle: During use, when the device receives an impact, the impact force affects the storage box 1. The storage box 1 can drive the arc sleeve 32 to move along the arc rod 34. Combined with the elastic force of the first spring 33, the shaking of the storage box 1 can be greatly buffered. When the storage box 1 shakes, it can drive the roller 35 to roll inside the arc shell 31, which can maintain the stability of the storage box 1. When the impact force affects the storage box 1, the arc shell 31 will also be affected. At this time, the arc shell 31 can shake and drive the slider 64 to slide in the slide groove. The slider 64 can drive the second slide rod 62 to slide in the second slide sleeve, and can be buffered by the elastic force of the second spring 46. Through the purpose of graded buffering, the probability of coal breakage can be greatly reduced. When the storage box 1 contains a large amount of coal, when the screw block 54 is rotated, it can drive the threaded column 53 to rotate. Under the action of the telescopic rod 55, the threaded cap can drive the circular plate 51 to move. The movement of the circular plate 51 can regulate the air... When the airbag 52 is compressed, the air inside the airbag 52 can be discharged into multiple anti-collision elastic air cylinders 57. At this time, the anti-collision elastic air cylinders 57 are in an inflated state. The expansion of multiple anti-collision elastic air cylinders 57 can increase the anti-collision area inside the storage box 1, avoiding large-area collision damage to coal during transportation. When it is necessary to remove the storage box 1 to load or unload coal, controlling the pressing block 42 to move upward can drive the first trapezoidal block 43 to move upward. The first trapezoidal block 43 can squeeze the two second trapezoidal blocks 45. The two second trapezoidal blocks 45 respectively drive the two side plates 49 to move away from each other through the two first sliding rods 48. The two side plates 49 moving away from each other respectively drive the two connecting plates 415 to move away from each other. The connecting plates 415 drive the insert rod 416 to move away from the rod groove. At this time, the rectangular sleeve 414 and the connecting block 36 are no longer fixed together. At this time, the storage box 1 is no longer fixed. Therefore, the storage box 1 can be taken out from the arc shell 31 through the U-shaped frame 41.
[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A coal anti-crushing device based on graded impact buffering, comprising a storage tank (1), characterized in that, The storage box (1) is provided with a door (2) on its outer surface, and a positioning mechanism (4) is provided on the outside of the storage box (1). The positioning mechanism (4) is located inside the first buffer mechanism (3), and the first buffer mechanism (3) is located inside the second buffer mechanism (6). An internal anti-collision mechanism (5) is provided inside the storage box (1).
2. The coal anti-crushing device based on graded impact buffer according to claim 1, characterized in that, The first buffer mechanism (3) includes a connecting block (36), and two arc-shaped sleeves (32) are fixedly connected to the lower surface of the connecting block (36). An arc-shaped rod (34) is slidably connected inside the arc-shaped sleeve (32), and the arc-shaped rod (34) is fixedly connected to an arc-shaped groove opened inside the arc-shaped shell (31).
3. A coal anti-crushing device based on graded impact buffer according to claim 2, characterized in that, Two first springs (33) are sleeved on the outer side of the arc-shaped rod (34). The opposite ends of the two first springs (33) are fixedly connected to the front and rear sides of the arc-shaped sleeve (32), and the far ends of the two first springs (33) are fixedly connected to the front and rear sides of the arc-shaped groove.
4. A coal anti-breakage device based on graded impact buffer according to claim 3, characterized in that, Multiple rollers (35) are fixedly connected to the lower surface of the storage box (1), and the multiple rollers (35) are arranged in two rows symmetrically on the left and right.
5. A coal anti-crushing device based on graded impact buffer according to claim 1, characterized in that, The positioning mechanism (4) includes a U-shaped frame (41) fixedly connected to the outside of the storage box (1). The U-shaped frame (41) is hollow inside. A first trapezoidal block (43) is provided on the upper side inside the U-shaped frame (41). Two limiting grooves are opened on the upper surface of the first trapezoidal block (43). A limiting rod (44) is provided in the limiting groove. The top end of the limiting rod (44) is fixedly connected to the upper surface of the inner wall of the U-shaped frame (41). A pressing block (42) is fixedly connected to the lower surface of the first trapezoidal block (43). The pressing block (42) extends through to the outside of the U-shaped frame (41).
6. A coal anti-crushing device based on graded impact buffer according to claim 5, characterized in that, The first trapezoidal block (43) has a second trapezoidal block (45) attached to both sides. The two second trapezoidal blocks (45) are fixedly connected to the opposite surfaces of each other with a first sliding rod (48). A first sliding sleeve is fitted on the outside of the first sliding rod (48). A fixing plate (47) is snapped onto the outside of the first sliding sleeve. The fixing plate (47) is fixedly connected inside the trapezoidal block. A second spring (46) is fitted on the outside of the first sliding rod (48). The two ends of the second spring (46) are fixedly connected to the opposite surfaces of the second trapezoidal block (45) and the second sliding sleeve, respectively.
7. A coal anti-crushing device based on graded impact buffer according to claim 6, characterized in that, Side plates (49) are fixedly connected to the far ends of the two first sliding rods (48). The side plates (49) are set inside the U-shaped frame (41). The left and right sides of the U-shaped frame (41) are provided with first through holes (410). The side plates (49) are provided with second through holes (411) corresponding to the positions of the first through holes (410). The bottom end of the side plates (49) passes through the third through hole (413) opened on the lower surface of the U-shaped frame (41). The opposite surfaces of the two side plates (49) are fixedly connected with connecting plates (415). The opposite surfaces of the two connecting plates (415) are fixedly connected with multiple insert rods (416). The insert rods (416) pass through the rectangular sleeve (414) and are inserted into the rod groove opened on the outer surface of the connecting block (36).
8. A coal anti-crushing device based on graded impact buffer according to claim 1, characterized in that, The internal anti-collision mechanism (5) includes two circular plates (51) arranged on the left and right sides of the storage box (1). Airbags (52) are fixedly connected to the opposite surfaces of the two circular plates (51). The two airbags (52) are fixedly connected to the left and right sides of the storage box (1) respectively. The two airbags (52) are connected to each other through multiple anti-collision elastic air cylinders (57). The anti-collision elastic air cylinders (57) are arranged inside the storage box (1).
9. A coal anti-crushing device based on graded impact buffer according to claim 9, characterized in that, The two circular plates (51) are each fitted with a threaded cap on their opposite sides. The threaded caps are connected to a threaded post (53) by an internal thread. The two threaded posts (53) are each fixedly connected to a screw block (54) at their far ends. The threaded post (53) passes through the first through hole (410) and the second through hole (411). The two threaded posts (53) are each fixedly connected to a rotating shaft (56) at their opposite ends. The rotating shaft (56) is fitted with a bearing on its outer side. The two bearings are respectively fitted to the left and right sides of the storage box (1). The two circular plates (51) are each fixedly connected to a telescopic rod (55) on their opposite sides. One end of the telescopic rod (55) is fixedly connected to one side of the storage box (1).
10. A coal anti-crushing device based on graded impact buffer according to claim 1, characterized in that, The second buffer mechanism (6) includes a slider (64) fixedly connected to the lower surface of the storage box (1). The slider (64) is slidably connected to a groove opened on the lower surface of the transport box (61). Two second slide rods (62) are fixedly connected to the front and rear sides of the slider (64) and are arranged symmetrically. The second slide rods (62) pass through the second slide sleeve that is snapped into one side of the storage box (1). A third spring (63) is sleeved on the outer side of the second slide rod (62). The two ends of the third spring (63) are fixedly connected to the opposite sides of the second slide sleeve and the slider (64) respectively.