Intelligent air transportation container storage equipment with automatic locking and clamping mechanism
By designing intelligent storage equipment for air transport containers with automatic locking mechanisms, the automatic transfer and positioning of air boxes is achieved using transmission devices and fixed components, the problems of high working intensity and low efficiency caused by manual handling and inventory in the prior art are solved, and the problem of high and low efficiency is improved. Automation and security of warehousing systems.
Patent Information
- Application Number
- CN202411297600.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2044-09-18
AI Technical Summary
The existing air transport container storage system requires manual handling and regular inventory of air boxes, resulting in high work intensity and low efficiency for workers.
An intelligent storage equipment for air transport containers with automatic locking mechanism is designed, including beam frames, transfer components and fixing components. The automatic transfer, positioning and fixing of the air box is achieved through transmission devices, guides, pulleys, motors and other components to avoid Manual handling and inventory.
It realizes automatic storage and access of airboxes, reduces labor intensity, improves warehousing efficiency, and ensures the safety and location certainty of airboxes.
Smart Images

Figure CN119190672A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of transfer devices, and in particular to intelligent storage equipment for air freight containers with an automatic locking and clamping mechanism. Background Art
[0002] Intelligent air container storage equipment is an important part of modern logistics warehousing systems, aiming to improve storage efficiency, reduce manual intervention, ensure the safety of air containers and optimize the use of storage space.
[0003] With the progress of modernization, the storage requirements for air boxes have also been improved with the advancement of technology. In order to improve the efficiency of taking air boxes, they have gradually become more refined, directional, and customized. In order to adapt to the taking and storage of different air boxes, the original warehouse uses shelves, and the air boxes are placed on the shelves manually. The goods on the shelves need to be manually counted before they can be taken, which is more troublesome. Therefore, there is an urgent need for an air container intelligent storage equipment with an automatic locking mechanism that can store air boxes according to the information of the air boxes. Moreover, when taking air boxes, there is no need to manually carry the air boxes, which reduces the work intensity of air box transportation. After the air boxes are stored, not only manual work is required for taking them, but also the air boxes need to be counted regularly, and the work intensity of the workers is relatively high. Summary of the invention
[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an intelligent storage equipment for air cargo containers with an automatic locking and clamping mechanism, which can solve the problem that after the storage of air cargo boxes, not only manual labor is required to take them out, but also the air cargo boxes need to be counted regularly, which results in high workload for the workers.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent storage equipment for air freight containers with an automatic locking and clamping mechanism, comprising a beam frame 2, a transfer component 1, a transfer component 2 and a fixing component; The transfer assembly 1 is arranged on the cross beam frame 2, and the transfer assembly 1 includes a transmission device 2 and two guide members, the transmission device 2 is installed on the cross beam frame 2, the two guide members are fixed on the cross beam frame 2, and the two guide members are respectively arranged on both sides of the upper end of the transmission device 2. There are multiple transfer assemblies 1, and multiple transfer assemblies 1 are arranged on the cross beam frame 2; The transfer assembly 2 is arranged under the cross beam frame 2, and the transfer assembly 2 includes a pulley 1, a traction rope, a transmission device 1, a base, a cross beam frame 1 and a guide base. The base is arranged at the lower end of the cross beam frame 2, the cross beam frame 1 is welded to the upper end of the base, the guide base slides along the surface of the cross beam frame 1, and the transmission device 1 is installed on the guide base; The fixing assembly is arranged on the second crossbeam frame, and the fixing assembly includes two fixing parts, two compression springs, two guide rods and a compression rod part. The two guide rods slide through the crossbeam on the second crossbeam frame, and the two fixing parts are respectively fixed at the lower ends of the corresponding guide rods. There are multiple fixing assemblies, and the multiple fixing assemblies are all arranged on the second crossbeam frame.
[0006] Preferably, pulley 2 is installed on the left side of beam frame 1, and pulley 1 is installed on the right side of beam frame 1.
[0007] Preferably, a motor 1 is installed on the right side bracket of the crossbeam frame 1, and the output end of the motor 1 is connected to the traction rope, and the traction rope passes through the pulley 1 and the pulley 2 and is connected to the upper end of the guide base.
[0008] Preferably, the upper end of the transmission device 1 conveys an aviation box, and the upper end of the transmission device 2 conveys the same aviation box.
[0009] Preferably, a plurality of rollers are installed on the surface of the base, and a second motor is installed on one side of the base, and the second motor is electrically connected to the plurality of rollers.
[0010] Preferably, the transfer component 2 is arranged between multiple transfer components 1, and a trailer is arranged on the outer side of the crossbeam frame 2.
[0011] Preferably, the plurality of clamping rods are all mounted on the cross beam of the second cross beam frame, and both ends of the plurality of clamping rods are respectively connected to corresponding clamping springs.
[0012] Preferably, the upper ends of the plurality of compression springs are fixedly connected to the cross beam of the second cross beam frame, and the lower ends of the plurality of compression springs are respectively fixedly connected to the upper ends of the corresponding fixing members.
[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The intelligent storage equipment for air cargo containers with an automatic locking mechanism is equipped with a transfer component 1 and a transfer component 2. The transmission device 2 of the right transfer component 1 can transfer the air box to the transfer component 2. Then, the transfer component 2 drives the air box to move to a suitable position, and then cooperates with the transfer component 1 to place the air box at a suitable position. The whole process does not require manual handling, etc., and because the transfer position can be stored in the cloud, there is no need to manually count the air boxes, thereby reducing subsequent work and saving manpower.
[0014] 2. The intelligent storage equipment for air cargo containers with an automatic locking mechanism is equipped with a transfer component 2. The motor 1 in the transfer component 2 can drive the guide base to a suitable height, so as to lift and lower the air box, eliminating the need for workers to lift the box, thereby greatly reducing the work intensity of the workers.
[0015] 3. The intelligent storage equipment for air cargo containers with an automatic locking mechanism is equipped with a fixing component, and the fixing component can fix the air box on the second transmission device to avoid the air box falling off due to the shaking of the second crossbeam frame when other air boxes are placed, thereby ensuring the safety of the air box.
[0016] 4. The intelligent storage equipment for air cargo containers with an automatic locking mechanism is capable of guiding the air cargo boxes by setting guide members in the transfer component 2, thereby preventing the air cargo boxes from being offset when being driven by the transmission device 2, that is, ensuring the certainty of the position of the air cargo boxes during the entire transfer process, thereby better performing the transfer of the air cargo boxes. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic side view of the overall structure of the present invention; Figure 2 It is an overall schematic diagram of an upper component of a crossbeam frame of the present invention; Figure 3 It is an overall schematic diagram of the second unit of the crossbeam frame of the present invention; Figure 4 This is a schematic diagram of the clamping state of the clamping mechanism of the present invention; Figure 5 This is a schematic diagram of the unlocking state of the clamping mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the clamping mechanism of the present invention.
[0018] Figure numerals: 1, aviation box; 2, trailer; 3, pulley 1; 4, traction rope; 5, motor 1; 6, transmission device 1; 7, motor 2; 8, roller; 9, base; 10, beam frame 1; 11, guide base; 12, pulley 2; 13, guide member; 14, transmission device 2; 15, beam frame 2; 16, fixing member; 17, clamping spring; 18, guide rod; 19, clamping rod member; 20, clamping mechanism; 21, motor and gear mechanism; 22, rack push rod mechanism; 23, push rod mechanism support; 24, V-shaped recess; 25, automatic return spring; 26, wedge block; 27, stacker; 28, stacker car; 29, travel in place detection switch; 30, travel in place block. DETAILED DESCRIPTION
[0019] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.
[0020] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0021] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0023] See also Figure 1-6 , the present invention provides a technical solution: an intelligent storage equipment for air freight containers with an automatic locking and clamping mechanism, comprising a beam frame 2 15, a transfer component 1, a transfer component 2 and a fixing component; The transfer assembly 1 is arranged on the cross beam frame 15, and the transfer assembly 1 includes a transmission device 14 and two guide members 13. The transmission device 14 is installed on the cross beam frame 15, and the two guide members 13 are fixed on the cross beam frame 15. The two guide members 13 are respectively arranged on both sides of the upper end of the transmission device 14. There are multiple transfer assemblies 1, and multiple transfer assemblies 1 are arranged on the cross beam frame 15; The transfer assembly 2 is arranged under the cross beam frame 15, and the transfer assembly 2 includes a pulley 3, a traction rope 4, a transmission device 6, a base 9, a cross beam frame 10 and a guide base 11. The base 9 is arranged at the lower end of the cross beam frame 15, the cross beam frame 10 is welded to the upper end of the base 9, the guide base 11 slides along the surface of the cross beam frame 10, and the transmission device 6 is installed on the guide base 11; The fixing assembly is arranged on the cross beam frame 15, and the fixing assembly includes two fixing parts 16, two compression springs 17, two guide rods 18 and a compression rod 19. The two guide rods 18 slide through the cross beam on the cross beam frame 15, and the two fixing parts 16 are respectively fixed at the lower ends of the corresponding guide rods 18. There are multiple fixing assemblies, and multiple fixing assemblies are arranged on the cross beam frame 15.
[0024] Pulley 2 12 is installed on the left side of beam frame 10, and pulley 1 3 is installed on the right side of beam frame 10.
[0025] A motor 5 is installed on the right side bracket of the crossbeam frame 10, and the output end of the motor 5 is connected to the traction rope 4, and the traction rope 4 passes through the pulley 1 3 and the pulley 2 12 and is connected to the upper end of the guide base 11.
[0026] The upper end of the transmission device 1 6 conveys an aviation box 1, and the upper end of the transmission device 2 14 conveys the same aviation box 1.
[0027] A plurality of rollers 8 are mounted on the surface of the base 9 , and a second motor 7 is mounted on one side of the base 9 . The second motor 7 is electrically connected to the plurality of rollers 8 .
[0028] The transfer component 2 is arranged between multiple transfer components 1, and a trailer 2 is arranged on the outer side of the second crossbeam frame 15.
[0029] The plurality of clamping rods 19 are all mounted on the cross beam of the second cross beam frame 15 , and both ends of the plurality of clamping rods 19 are respectively connected to corresponding clamping springs 17 .
[0030] The upper ends of the plurality of compression springs 17 are fixedly connected to the cross beam of the second cross beam frame 15 , and the lower ends of the plurality of compression springs 17 are fixedly connected to the upper ends of the corresponding fixing members 16 .
[0031] When it is necessary to transfer air box 1; First, the label on the aviation box 1 is scanned to determine the information of the aviation box 1 .
[0032] Secondly, place the aviation box 1 on the trailer 2, and then, after the trailer 2 drives the aviation box 1 to a suitable position, first contact the aviation box 1 with the upper end of the transmission device 2 14 on the right side, and then, start the transmission device 2 14 to drive the aviation box 1 to the upper end of the guide base 11 and the upper surface of the transmission device 1 6, and then, start the transmission device 16 to drive the aviation box 1 to move to the middle of the transmission device 16, and then, start the motor 2 7. The start of the motor 2 7 drives multiple rollers 8 to rotate and drive the base 9 to move to a suitable position, then start the motor 15 to drive the traction rope 4 to move, the movement of the traction rope 4 drives the guide base 11 to move up and down, the movement of the guide base 11 drives the transmission device 1 6 to move up and down, the up and down movement of the transmission device 1 6 drives the aviation box 1 to move up and down to a suitable height, and then, start the transmission device 6 to drive the aviation box 1 to move, after the aviation box 1 moves to the upper surface of the corresponding transmission device 2 14, then, start the transmission device 2 14 to drive the aviation box 1 to move to a suitable position.
[0033] Finally, the clamping rod 19 is started, and the starting of the clamping rod 19 drives the two clamping springs 17 to move downward synchronously. The two clamping springs 17 respectively drive the corresponding fixing members 16 to move downward, and the two fixing members 16 move downward synchronously to fix the position of the aviation box 1.
[0034] Equipment safety device All-round closed-circuit monitoring device: multi-directional high-definition cameras are used to monitor the storage area in real time 24 hours a day; Photoelectric safety device: Use infrared sensing device to detect whether the cargo box is deviated. If it deviates, the equipment will stop running, ensuring the safety of the entire warehouse area. AKE automatic lock device: when the container is placed in the storage position, the lock is automatically locked to ensure the safe placement of the air box; when the container is out of the warehouse, the stacker is automatically unlocked; Lifting limit protection device: After the equipment is lifted into place, the lifting device is locked by a mechanical latch to ensure lifting safety.
[0035] Centralized monitoring device for system operation: This warehouse has a centralized monitoring room with a host computer system to collect real-time operation data of storage equipment (PLC). It can not only understand the operation status of the equipment, but also realize automatic inventory of storage boxes and display the remaining space in the warehouse, which can be connected to a printer for printing. Real-time data can also be transmitted to the airport management cloud.
[0036] Warehouse windproof, earthquakeproof, ventilation and fire-fighting measures Wind-proof measures: The equipment is maintained outside (warehouse), and the exterior walls are made of rock wool sandwich decorative panels, which are both thermally insulating and decorative. The colors are coordinated with the airport buildings, and are beautiful and atmospheric.
[0037] Earthquake-proof measures: The equipment's external maintenance (warehouse) structure is designed in accordance with the airport's earthquake-proof level regulations.
[0038] Ventilation measures: 24 powered ventilators are designed on the roof of the external maintenance (warehouse); shutters are installed around the exterior walls to achieve natural ventilation.
[0039] Fire Fighting Measures: The structure is painted with fire-retardant paint, with a fire resistance rating of more than 2.5 hours; There is a fire hydrant at each end of the warehouse to extinguish the fire in due time; The gates at both ends are open, so fire trucks can enter and put out the fire directly; Fire trucks can spray water from shutters all around to extinguish fires.
[0040] By setting up transfer component 1 and transfer component 2, the transmission device 2 14 of the right transfer component 1 can transfer the air box to the transfer component 2. Subsequently, the transfer component 2 drives the air box 1 to move to a suitable position, and then cooperates with the transfer component 1 to place the air box at a suitable position. The whole process does not require manual handling, etc., and because the transfer position can be stored in the cloud, there is no need to manually count the air boxes, thereby reducing subsequent work and saving manpower.
[0041] By setting up the transfer component 2, the motor 1 5 in the transfer component 2 can drive the guide base 11 to a suitable height, so as to lift and lower the aviation box, eliminating the need for workers to lift it, thereby greatly reducing the work intensity of the workers.
[0042] By setting a fixing component, the fixing component can fix the aviation box 1 on the transmission device 14 to avoid the aviation box 1 shaking with the crossbeam frame 15 when other aviation boxes are placed, causing the aviation box 1 to fall off, thereby ensuring the safety of the aviation box 1.
[0043] By setting the guide members 13 in the transfer component 2, the two guide members 13 can guide the air box 1 to avoid the displacement of the air box 1 when the air box 1 is transmitted by the transmission device 2 14, that is, to ensure the certainty of the position of the air box in the entire transfer process, so as to better perform the transfer work of the air box 1.
[0044] More detailed description: The three-dimensional warehouse system runs automatically according to the program. When the stacker 27 runs to the designated cargo position for placing the air box, the stacker 27 will automatically stop accurately on the track and accurately position itself with a very small error, within 3mm.
[0045] There is a push rod unlocking mechanism on the top of the stacker car 28, see Figure 4 , Figure 5 , Figure 6 ; Each cargo space where the air box 1 is placed has a clamping mechanism on the top thereof and is in an automatic clamping state.
[0046] To place the air box 1 on the cargo position, first, the push rod unlocking motor is activated, the push rod is pushed out, and the clamping mechanism 20 is lifted up and in an unlocked state. Then the air box 1 can be accurately delivered to the cargo position.
[0047] The push rod unlocks the motor and moves in the reverse direction, and the push rod is retracted. The clamping mechanism 20 automatically presses the aviation box downward and gives a suitable clamping force to ensure that the aviation box 1 does not fall over.
[0048] Specific steps: When the stacker 27 delivers the air box 1 to the designated cargo position, the clamping mechanism 20 on the stacker 27 is actively released and unlocked.
[0049] At the same time, the motor and gear mechanism 21 on the top of the stacker 27 start to run, the rack push rod mechanism 22 extends forward on the push rod mechanism support 23, the push rod mechanism push rod head is a V-shaped convex head, which engages with the V-shaped concave head 24 on the clamping mechanism 20, and then the push rod continues to move forward, so that the wedge block 26 also moves forward.
[0050] The wedge block 26 lifts up the entire clamping mechanism 20 through the wedge surface. After being lifted up by about 40 mm, the travel stopper 30 triggers the travel detection switch 29, and the motor and gear mechanism 21 stop moving. At this time, the unlocking mechanism is completely in the unlocking state.
[0051] The conveying system on the stacker car 28 then delivers the air box 1 to the cargo position.
[0052] After the air box is delivered to the cargo position, the motor and gear mechanism 21 on the top of the stacker start to run in reverse. The rack push rod mechanism 22 is retracted onto the stacker on the push rod mechanism support 23 , and the push rod head of the push rod mechanism is a V-shaped convex head, which is disengaged from the V-shaped concave head 24 on the clamping mechanism 20 .
[0053] At the same time, the automatic return spring 25 behind the V-shaped recessed head 24 is activated, the wedge block 26 is completely disengaged from the wedge surface of the clamping mechanism 20, and then the clamping mechanism has no upward force, and the four clamping springs 17 on the clamping mechanism 20 automatically press the aviation box 1 downward, so that the four clamping fixtures 16 are tightly pressed on the aviation box 1.
[0054] When taking out the air box 1, the air box 1 in the cargo position is delivered to the stacker car 28 on the stacker 27, and the action is opposite to that described above.
[0055] Working principle: When it is necessary to transfer air box 1; First, the label on the aviation box 1 is scanned to determine the information of the aviation box 1 .
[0056] Secondly, place the aviation box 1 on the trailer 2, and then, after the trailer 2 drives the aviation box 1 to a suitable position, first contact the aviation box 1 with the upper end of the transmission device 2 14 on the right side, and then, start the transmission device 2 14 to drive the aviation box 1 to the upper end of the guide base 11 and the upper surface of the transmission device 1 6, and then, start the transmission device 16 to drive the aviation box 1 to move to the middle of the transmission device 16, and then, start the motor 2 7. The start of the motor 2 7 drives multiple rollers 8 to rotate and drive the base 9 to move to a suitable position, then start the motor 15 to drive the traction rope 4 to move, the movement of the traction rope 4 drives the guide base 11 to move up and down, the movement of the guide base 11 drives the transmission device 1 6 to move up and down, the up and down movement of the transmission device 1 6 drives the aviation box 1 to move up and down to a suitable height, and then, start the transmission device 6 to drive the aviation box 1 to move, after the aviation box 1 moves to the upper surface of the corresponding transmission device 2 14, then, start the transmission device 2 14 to drive the aviation box 1 to move to a suitable position.
[0057] Finally, the clamping rod 19 is started, and the starting of the clamping rod 19 drives the two clamping springs 17 to move downward synchronously. The two clamping springs 17 respectively drive the corresponding fixing members 16 to move downward, and the two fixing members 16 move downward synchronously to fix the position of the aviation box 1.
[0058] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.
Claims
1. An intelligent storage equipment for air freight containers with an automatic locking mechanism, characterized in that: include: A second crossbeam frame (15), a transfer assembly (1), a transfer assembly (2) and a fixing assembly; The transfer assembly one is arranged on the second crossbeam frame (15), and the transfer assembly one comprises a second transmission device (14) and two guide members (13). The second transmission device (14) is installed on the second crossbeam frame (15), and the two guide members (13) are fixed on the second crossbeam frame (15). The two guide members (13) are respectively arranged on both sides of the upper end of the second transmission device (14). There are a plurality of transfer assemblies one, and the plurality of transfer assemblies one are all arranged on the second crossbeam frame (15); The transfer assembly 2 is arranged under the cross beam frame 2 (15), and the transfer assembly 2 comprises a pulley 1 (3), a traction rope (4), a transmission device 1 (6), a base (9), a cross beam frame 1 (10) and a guide base (11), the base (9) is arranged at the lower end of the cross beam frame 2 (15), the cross beam frame 1 (10) is welded to the upper end of the base (9), the guide base (11) slides along the surface of the cross beam frame 1 (10), and the transmission device 1 (6) is installed on the guide base (11); The fixing assembly is arranged on the second crossbeam frame (15), and the fixing assembly comprises two fixing members (16), two compression springs (17), two guide rods (18) and a compression rod member (19). The two guide rods (18) are slidably passed through the crossbeam on the second crossbeam frame (15), and the two fixing members (16) are respectively fixed to the lower ends of the corresponding guide rods (18). There are a plurality of fixing members, and the plurality of fixing members are arranged on the second crossbeam frame (15).
2. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: The pulley 2 (12) is installed on the left side of the crossbeam frame 1 (10), and the pulley 1 (3) is installed on the right side of the crossbeam frame 1 (10).
3. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: A motor 1 (5) is installed on the right side bracket of the crossbeam frame 1 (10), and the output end of the motor 1 (5) is connected to a traction rope (4), and the traction rope (4) passes through a pulley 1 (3), a pulley 2 (12) and is connected to the upper end of the guide base (11).
4. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: The upper end of the transmission device 1 (6) conveys an aviation box (1), and the upper end of the transmission device 2 (14) conveys a similar aviation box (1).
5. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: A plurality of rollers (8) are mounted on the surface of the base (9), and a second motor (7) is mounted on one side of the base (9), wherein the second motor (7) is electrically connected to the plurality of rollers (8).
6. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: The second transfer component is arranged between a plurality of first transfer components, and a trailer (2) is arranged outside the second crossbeam frame (15).
7. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: The plurality of clamping rods (19) are mounted on the crossbeam of the second crossbeam frame (15), and the two ends of the plurality of clamping rods (19) are respectively connected to corresponding clamping springs (17).
8. The intelligent storage equipment for air freight containers with an automatic locking mechanism according to claim 1 is characterized in that: The upper ends of the plurality of compression springs (17) are fixedly connected to the crossbeam of the second crossbeam frame (15), and the lower ends of the plurality of compression springs (17) are respectively fixedly connected to the upper ends of the corresponding fixing members (16).
Citation Information
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