Adjustable carrying frame for carrying tool magazine

By designing an adjustable transport frame and utilizing docking and lifting components, the problems of cumbersome operation and high cost of traditional tool magazine handling equipment have been solved, enabling flexible and efficient handling of different types of tool magazines and ensuring the stability of the tool magazine during the handling process.

CN121246903APending Publication Date: 2026-01-02KUNSHAN BEIJU MASCH CO LTD
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Patent Information

Application Number
CN202511579228.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-31
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Traditional tool magazine handling methods require large hoisting equipment, involve the entire process, and are cumbersome to operate. They are difficult to implement in machining workshops with limited space. Furthermore, different types of tool magazines require different handling tools and methods, which increases handling costs and complexity.

Method used

Design an adjustable transport frame, including a detachable transport cart and various docking components, such as lead screws, locking nuts, male and female buckle plates, docking strips and locking tongues, etc. The size of the transport frame can be adjusted by docking components to adapt to different specifications of tool magazines, and the stability of the tool magazine can be ensured by lifting and limiting components.

Benefits of technology

It enables flexible, convenient, and efficient handling of different types of tool magazines, adapts to the hoisting of tool magazines without outriggers or with short outriggers, and has stable limit and docking functions, reducing operational complexity and cost.

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Abstract

The invention belongs to the technical field of carrying frames, and particularly relates to an adjustable carrying frame for tool magazine carrying, which comprises two separable carrying vehicles, the two carrying vehicles are connected together through a butt joint assembly, each carrying vehicle is further provided with a lifting assembly and a limiting assembly, and each carrying vehicle comprises a bottom plate, rollers and a handrail. At least three rollers are installed at the bottom of the bottom plate, and the handrail is fixedly connected to the outer end of the top of the bottom plate. According to the tool magazine carrying frame, the two separable carrying vehicles are connected through the butt joint assembly, the overall size of the carrying frame can be adjusted according to the length of the tool magazine, the tool magazine carrying frame is suitable for carrying tool magazines of different specifications, and for the tool magazines without supporting legs or with very short supporting legs, the carrying vehicles can be in butt joint firstly, and then the tool magazines are hoisted to the lifting assembly through hoisting equipment; for a tool magazine with supporting legs, the carrying trolley can be in butt joint from the bottom of the tool magazine and lift the tool magazine, and the operation modes are flexible and diverse.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of handling frame, in particular to a adjustable handling frame for tool magazine handling. BACKGROUND

[0002] In the field of machine tool processing, tool magazine is an important component for realizing automatic processing, which stores a variety of different types of tools inside and can automatically replace tools according to processing needs. With the development of manufacturing industry, the types and specifications of tool magazines are increasingly diversified, and their weights and volumes also have great differences.

[0003] Some tool magazines do not have legs or have short legs due to structural design reasons, while others are equipped with legs. The traditional tool magazine handling method often needs to use large lifting equipment throughout the process, which is not only cumbersome to operate, but also difficult to use in some limited space processing workshops. In addition, different handling tools and methods need to be used for different types of tool magazines, which increases the handling cost and complexity. Therefore, a handling device that can adapt to different types of tool magazines, is simple and efficient to operate is needed. SUMMARY

[0004] Based on the technical problems existing in the prior art, the present application provides an adjustable handling frame for tool magazine handling.

[0005] The adjustable handling frame for tool magazine handling provided by the present application comprises two separable handling cars, the two handling cars are connected together through a docking assembly, and each handling car is further provided with a lifting assembly and a limiting assembly. The handling car comprises a bottom plate, rollers and a handrail. Not less than three rollers are installed at the bottom of the bottom plate, and the handrail is fixedly connected to the outer end of the top of the bottom plate. For tool magazines without legs or with short legs, first move the handling car through the handrail to make the two handling cars close to each other, then dock the two handling cars through the docking assembly, adjust the lifting assembly to a suitable height higher than the storage plate, then hoist the tool magazine to the two lifting assemblies through the lifting equipment, and finally limit the tool magazine through the limiting assembly. In this way, the tool magazine can be handled through the handling frame. For tool magazines with legs, first move the two handling cars to the two sides of the tool magazine through the handrail, then make the two handling cars close to each other from the bottom of the tool magazine, dock the two handling cars through the docking assembly, lift the tool magazine through the lifting assembly, and finally limit the tool magazine through the limiting assembly. In this way, the tool magazine can be handled through the handling frame.

[0006] Preferably, the lifting assembly comprises a jack and a carrier plate, the jack is fixedly connected to the top of the bottom plate, and the carrier plate is fixedly connected to the top end of the jack. The carrier plate can be lifted through the jack to lift the tool magazine.

[0007] Preferably, a set of symmetrically distributed guide posts are fixedly connected to the bottom of the carrier plate, and a guide cylinder is sleeved at the bottom end of the guide post. The bottom end of the guide cylinder is fixedly connected to the bottom plate. The carrier plate can be stably limited and moved by the cooperation between the guide post and the guide cylinder.

[0008] Preferably, the limiting component includes a set of symmetrically distributed storage plates. The outer ends of the storage plates have grooves, and extension plates are inserted into the grooves. A positioning plate near the outer end of the extension plate is connected to a storage groove at the top of the extension plate via a rotating shaft. A locking knob is threaded onto the bottom surface of the storage plates. A limiting groove for inserting the locking knob is provided at the bottom of the extension plates. First, the locking knob is rotated to release the extension plates. After the garage is stably placed on the lifting component, the two extension plates are pulled out from their respective storage plates. Then, the positioning plate is flipped out of its storage groove. The extension plates are then pushed back along the storage plates until the positioning plate is flush with the side of the garage. At this point, the locking knob is rotated to fix the extension plates. This allows the positioning plates to limit the movement of the garage.

[0009] Preferably, the maximum rotation angle of the positioning plate is 90°; when the positioning plate is in contact with the side of the garage, the positioning plate will be stable in a state perpendicular to the extension plate, thereby forming a stable limit for the garage.

[0010] Preferably, the docking assembly includes two sets of matching lead screws and locking nuts. The two lead screws are fixedly connected to the inner end of one of the base plates, and the other base plate has a set of through holes for the corresponding lead screws to pass through. When the two transport vehicles approach each other, the lead screws and corresponding through holes are aligned and inserted. When the distance between the two transport vehicles is close to the length of the garage, the movement stops, and then the locking nuts are tightened to the ends of the lead screws to dock the two transport vehicles together.

[0011] Preferably, the docking assembly includes a set of matching sub-plates and a female plate. The sub-plate is slidably disposed on the inner end of one of the base plates, and the female plate is fixedly connected to the inner end of the other base plate. A pull rod is fixedly connected to one end of the sub-plate. First, the sub-plate is pulled to the side of the base plate using the pull rod. Then, the two transport vehicles are brought closer together. When the distance between the two transport vehicles is close to the length of the garage, the movement is stopped. Then, the sub-plate is moved along the width direction of the base plate using the pull rod until the sub-plate and the female plate are joined together, thus docking the two transport vehicles.

[0012] Preferably, the sub-plate is slidably connected to the slide rail, and the slide rail is fixedly connected to the corresponding base plate; thus, the sub-plate can be limited and moved by the slide rail, making it convenient to switch the position of the sub-plate at any time.

[0013] Preferably, the docking assembly comprises two sets of matching docking bars and locking tongues, the two docking bars are fixedly connected to the inner ends of one of the two base plates respectively, the other base plate is provided with docking holes for the corresponding docking bars to pass through, the side of the docking bar close to the locking tongue is provided with a plurality of uniformly distributed locking holes for the end of the locking tongue to insert, the end of the locking tongue is provided with an inclined surface or an arc surface, and the locking tongue is elastically connected with the base plate; when the two carriers are close to each other, the docking bars and the corresponding docking holes are aligned and inserted, and when the distance between the two carriers is close to the length of the garage, the movement is stopped, at this time, under the action of the elastic force, the end of the locking tongue will be inserted into the corresponding locking hole, that is, the two carriers can be docked, and since the end of the locking tongue is provided with an inclined surface or an arc surface, the locking tongue can limit the two carriers from moving away from each other, and the process of the two carriers moving close to each other will not be limited by the locking tongue.

[0014] Preferably, one end of the L-shaped locking tongue is provided with a guide column, the end of the guide column is fixedly connected to a fixed seat, the fixed seat is fixedly connected to the base plate, and a spring is further sleeved on the guide column, and the two ends of the spring are fixedly connected with the fixed seat and the locking tongue respectively; the guide column can be used for stable positioning of the locking tongue, and the spring can be used for driving the locking tongue to automatically insert into the corresponding locking hole.

[0015] Compared with the prior art, the present application provides an adjustable carrying frame for tool magazine carrying, which has the following advantages: 1. An adjustable carrying frame for tool magazine carrying, which connects two separable carriers through a docking assembly, can adjust the overall size of the carrying frame according to the length of the tool magazine, is suitable for carrying tool magazines of different specifications, and can first dock the carriers and then hoist the tool magazine to the lifting assembly through hoisting equipment for tool magazines without supporting legs or with very short supporting legs, and can dock the carriers from the bottom of the tool magazine and lift the tool magazine for tool magazines with supporting legs, so that the operation mode is flexible and diverse.

[0016] 2. An adjustable carrying frame for tool magazine carrying, the guide column and the guide cylinder in the lifting assembly cooperate to enable stable positioning and movement of the carrier plate, and ensure the stability of the tool magazine during lifting. The limiting assembly is attached to the side of the tool magazine through the positioning plate to form stable limiting, thereby preventing the tool magazine from shaking or shifting during carrying.

[0017] 3. An adjustable carrying frame for tool magazine carrying, which provides various docking assembly schemes, such as long silk rods cooperating with locking nuts, child buckle plates cooperating with mother buckle plates, docking bars cooperating with locking tongues, etc., so that appropriate docking methods can be selected according to actual needs to conveniently and quickly complete the docking of the carriers. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The present application provides an overall structure schematic diagram of an adjustable carrying frame for tool magazine carrying before assembly; Figure 2 An assembled overall structure diagram of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 3 An application diagram of the adjustable carrying frame for tool magazine carrying according to the present application when carrying a tool magazine without supporting legs is provided. Figure 4 An application diagram of the adjustable carrying frame for tool magazine carrying according to the present application when carrying a tool magazine with supporting legs is provided. Figure 5 A top structure diagram of the bottom plate of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 6 A bottom structure diagram of the bottom plate of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 7 A cross-sectional structure diagram of the storage plate of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 8 An application diagram of the female buckle plate and the male buckle plate of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 9 An application diagram of the lock tongue and the butt joint strip of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 10 An application diagram of the adjustable carrying frame for tool magazine carrying according to the present application is provided. Figure 9 An enlarged structure diagram of A of the adjustable carrying frame for tool magazine carrying according to the present application is provided.

[0019] In the figure: 1, bottom plate; 2, jack; 3, load plate; 4, roller; 5, handrail; 6, storage plate; 7, sliding groove; 8, extension plate; 9, locking knob; 10, limiting groove; 11, storage groove; 12, positioning plate; 13, guide column; 14, guide cylinder; 15, long lead screw; 16, perforation; 17, locking nut; 18, sliding rail; 19, male buckle plate; 20, female buckle plate; 21, pull rod; 22, butt joint strip; 23, butt joint hole; 24, lock tongue; 25, lock hole; 26, fixed seat; 27, guide column; 28, spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] Referring to Figures 1-10 An adjustable carrying frame for carrying a tool magazine, comprising two separable carrying vehicles, the two carrying vehicles are connected together through a docking assembly, and each carrying vehicle is further provided with a lifting assembly and a limiting assembly, the carrying vehicle comprises a bottom plate 1, a roller 4 and a handrail 5, not less than three rollers 4 are installed at the bottom of the bottom plate 1, and the handrail 5 is fixedly connected to the outer end of the top of the bottom plate 1; In use, for a tool magazine without supporting legs or with very short supporting legs (such as Figure 3 ), first move the carrying vehicles by the handrails 5 to make the two carrying vehicles close to each other, then dock the two carrying vehicles through the docking assembly, adjust the lifting assembly to a suitable height higher than the storage plate 6, then hoist the tool magazine to the two lifting assemblies through hoisting equipment, and finally limit the tool magazine through the limiting assembly, so that the tool magazine can be carried by the carrying frame; for a tool magazine with supporting legs (such as Figure 4 ), first move the two carrying vehicles to the two sides of the tool magazine by the handrails 5, then make the two carrying vehicles close to each other from the bottom of the tool magazine, and dock the two carrying vehicles through the docking assembly, then lift the tool magazine through the lifting assembly, and finally limit the tool magazine through the limiting assembly, so that this type of tool magazine can be carried by the carrying frame.

[0023] The lifting assembly comprises a jack 2 and a carrier plate 3, the jack 2 is fixedly connected to the top of the bottom plate 1, and the carrier plate 3 is fixedly connected to the top end of the jack 2; In use, the carrier plate 3 can be lifted by the jack 2, so that the tool magazine can be lifted, and the lifting assembly can also be other common hydraulic, electric or manual telescopic devices, and here the jack 2 can be a manual scissor jack.

[0024] Further, a set of symmetrically distributed guide columns 13 are fixedly connected to the bottom of the carrier plate 3, and a guide cylinder 14 is sleeved at the bottom end of the guide column 13, and the bottom end of the guide cylinder 14 is fixedly connected to the bottom plate 1; In use, the carrier plate 3 can be stably limited and moved through the cooperation between the guide column 13 and the guide cylinder 14.

[0025] The limiting assembly comprises a set of symmetrically distributed receiving plates 6, the outer end of the receiving plate 6 is provided with a sliding groove 7, the sliding groove 7 is provided with an extension plate 8, the top of the extension plate 8 is provided with a receiving groove 11, the receiving groove 11 is connected with a positioning plate 12 through a rotating shaft, the bottom surface of the receiving plate 6 is provided with a locking knob 9, the bottom of the extension plate 8 is provided with a limiting groove 10 for inserting the locking knob 9, and the maximum turning angle of the positioning plate 12 is 90°; In use, the extension plate 8 is first fixed by rotating the locking knob 9, and then the two extension plates 8 are pulled out from the corresponding receiving plates 6, and then the positioning plate 12 is turned out from the receiving groove 11, and then the extension plate 8 is pushed back along the receiving plate 6 until the positioning plate 12 is attached to the side of the garage (as shown in Figure 3 and Figure 4 shown), and then the extension plate 8 is fixed by rotating the locking knob 9, so that the positioning plate 12 can limit the garage.

[0026] In use, when the positioning plate 12 is attached to the side of the garage, the positioning plate 12 will be stable in a state perpendicular to the extension plate 8, thereby forming stable limiting for the garage.

[0027] The docking assembly comprises two sets of matched long lead screws 15 and locking nuts 17, the two long lead screws 15 are fixedly connected to the inner end of one of the bottom plates 1, and the other bottom plate 1 is provided with a set of through holes 16 for the corresponding long lead screws 15 to pass through; In use, when the two trolleys are close to each other, the long lead screw 15 and the corresponding through hole 16 are aligned and inserted, and when the distance between the two trolleys is close to the length of the garage, the movement is stopped, and then the locking nut 17 is tightened to the end of the long lead screw 15, so that the two trolleys are docked.

[0028] In another embodiment, the docking assembly can also comprise a set of matched sub-dog plates 19 and female dog plates 20, the sub-dog plate 19 is slidingly arranged at the inner end of one of the bottom plates 1, the female dog plate 20 is fixedly connected to the inner end of the other bottom plate 1, and one end of the sub-dog plate 19 is fixedly connected with a pull rod 21; In use, the sub-dog plate 19 is first pulled to the side of the bottom plate 1 by the pull rod 21, and then the two trolleys are close to each other, and when the distance between the two trolleys is close to the length of the garage, the movement is stopped, and then the sub-dog plate 19 is moved along the width direction of the bottom plate 1 by the pull rod 21 until the sub-dog plate 19 and the female dog plate 20 are docked together, so that the two trolleys are docked.

[0029] The sub-dog plate 19 is slidingly connected to the sliding rail 18, and the sliding rail 18 is fixedly connected to the corresponding bottom plate 1; In use, the sub-plate 19 can be moved by the slide rail 18, and the position of the sub-plate 19 can be switched at any time.

[0030] In another embodiment, the docking assembly can further include two sets of mating docking bars 22 and locking tongues 24, the two docking bars 22 are fixedly connected to the inner ends of the two base plates 1 respectively, the other base plate 1 is provided with a docking hole 23 for the corresponding docking bar 22 to pass through, the side of the docking bar 22 close to the locking tongue 24 is provided with a plurality of locking holes 25 for the end of the locking tongue 24 to insert, the end of the locking tongue 24 is provided with an inclined surface or an arc surface, and the locking tongue 24 is elastically connected to the base plate 1; In use, when the two trolleys are close to each other, the docking bar 22 and the corresponding docking hole 23 are aligned and inserted, and the movement is stopped when the distance between the two trolleys is similar to the length of the garage, at this time, under the action of the elastic force, the end of the locking tongue 24 is inserted into the corresponding locking hole 25, and the two trolleys are docked, and since the end of the locking tongue 24 is provided with an inclined surface or an arc surface, the locking tongue 24 can limit the two trolleys from moving away from each other, and the process of the two trolleys moving close to each other is not limited by the locking tongue 24.

[0031] The end of the L-shaped locking tongue 24 is provided with a guide column 27, the end of the guide column 27 is fixedly connected to a fixed seat 26, the fixed seat 26 is fixedly connected to the base plate 1, and a spring 28 is further sleeved on the guide column 27, and the two ends of the spring 28 are fixedly connected to the fixed seat 26 and the locking tongue 24 respectively; In use, the locking tongue 24 can be stably positioned by the guide column 27, and the locking tongue 24 can be automatically inserted into the corresponding locking hole 25 by the elastic force of the spring 28.

[0032] Working principle: When the tool magazine is transported, for the tool magazine without supporting legs or with short supporting legs, the operator pushes the trolley through the handrail 5, so that the two trolleys are close to each other and connected through the docking assembly, after the docking is completed, the operator adjusts the carrier plate 3 to a suitable height higher than the storage plate 6 through the jack 2, then uses the hoisting equipment to hoist the tool magazine to the carrier plate 3, at this time, the locking knob 9 is loosened, the extension plate 8 is pulled out of the sliding groove 7 of the storage plate 6, the positioning plate 12 is turned out of the storage groove 11 by 90°, then the extension plate 8 is pushed back, so that the positioning plate 12 is tightly attached to the side of the tool magazine, finally, the locking knob 9 is tightened to fix the extension plate 8, and the positioning of the tool magazine is completed; For the tool magazine with supporting legs, the two trolleys are moved to the two sides of the tool magazine respectively, then the trolleys are close to each other from the bottom of the tool magazine, and are connected through the docking assembly, after the docking is completed, the carrier plate 3 is raised to lift the tool magazine off the ground through the jack 2, and the subsequent positioning operation is the same as that of the tool magazine without supporting legs, the stable positioning of the tool magazine is realized by adjusting and fixing the positions of the extension plate 8 and the positioning plate 12; In the lifting process, the guide column 13 slides in the guide cylinder 14, ensuring the stable lifting of the carrier plate 3, avoiding shaking or tilting, and the three implementation modes of the butt joint assembly can be selected according to actual needs: the long screw rod 15 is inserted into the perforation 16 and the locking nut 17 is tightened; the sub-buckle plate 19 is moved to butt joint with the female buckle plate 20 through the pull rod 21; after the butt joint strip 22 is inserted into the butt joint hole 23, the spring 28 is inserted into the lock hole 25 at the end of the lock tongue 24, the quick butt joint is realized, the stable carrying of the tool magazine is realized through the cooperation of each component, and the tool magazine is suitable for different types of tool magazines.

[0033] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical scheme and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An adjustable transport frame for transporting a tool magazine, comprising two detachable transport carts, characterized in that, The two transport vehicles are connected together by a docking assembly. Each transport vehicle is also equipped with a lifting assembly and a limiting assembly. The transport vehicle includes a base plate (1), rollers (4) and a handrail (5). No less than three rollers (4) are installed at the bottom of the base plate (1), and the handrail (5) is fixedly connected to the outer end of the top of the base plate (1).

2. The adjustable transport frame for tool magazine transport according to claim 1, characterized in that, The lifting assembly includes a jack (2) and a carrier plate (3). The jack (2) is fixedly connected to the top of the base plate (1), and the carrier plate (3) is fixedly connected to the top of the jack (2).

3. The adjustable transport frame for tool magazine transport according to claim 2, characterized in that, The bottom of the carrier plate (3) is fixedly connected to a set of symmetrically distributed guide columns (13), and the bottom end of the guide column (13) is fitted with a guide cylinder (14), and the bottom end of the guide cylinder (14) is fixedly connected to the base plate (1).

4. The adjustable transport frame for tool magazine transport according to claim 1, characterized in that, The limiting component includes a set of symmetrically distributed storage plates (6). The outer end of the storage plate (6) is provided with a groove (7). An extension plate (8) is inserted into the groove (7). The storage groove (11) at the top of the extension plate (8) is connected to a positioning plate (12) near the outer end of the extension plate (8) via a rotating shaft. The bottom surface of the storage plate (6) is threaded with a locking knob (9). The bottom of the extension plate (8) is provided with a limiting groove (10) for the locking knob (9) to be inserted.

5. An adjustable transport frame for transporting a tool magazine according to claim 4, characterized in that, The maximum flip angle of the positioning plate (12) is 90°.

6. An adjustable transport frame for transporting a tool magazine according to claim 1, characterized in that, The docking assembly includes two sets of matching long screws (15) and locking nuts (17). The two long screws (15) are fixedly connected to the inner end of one of the base plates (1), and the other base plate (1) has a set of through holes (16) for the corresponding long screws (15) to pass through.

7. An adjustable transport frame for transporting a tool magazine according to claim 1, characterized in that, The docking assembly includes a set of matching sub-plates (19) and female plates (20). The sub-plates (19) are slidably disposed on the inner end of one of the base plates (1), and the female plates (20) are fixedly connected to the inner end of the other base plate (1). A pull rod (21) is fixedly connected to one end of the sub-plates (19).

8. An adjustable transport frame for transporting a tool magazine according to claim 7, characterized in that, The sub-plate (19) is slidably connected to the slide rail (18), and the slide rail (18) is fixedly connected to the corresponding base plate (1).

9. An adjustable transport frame for transporting a tool magazine according to claim 1, characterized in that, The docking assembly includes two sets of matching docking strips (22) and locking tongues (24). The two docking strips (22) are respectively fixedly connected to the inner end of one of the base plates (1). The other base plate (1) has docking holes (23) for the corresponding docking strips (22) to pass through. The docking strips (22) have multiple evenly distributed locking holes (25) for the end of the locking tongues (24) to be inserted on the side near the locking tongues (24). The end of the locking tongues (24) has a bevel or arc surface, and the locking tongues (24) are elastically connected to the base plate (1).

10. An adjustable transport frame for transporting a tool magazine according to claim 9, characterized in that, One end of the L-shaped locking tongue (24) is fitted with a guide post (27), the end of the guide post (27) is fixedly connected to the fixed seat (26), the fixed seat (26) is fixedly connected to the base plate (1), and a spring (28) is also fitted on the guide post (27). The two ends of the spring (28) are fixedly connected to the fixed seat (26) and the locking tongue (24) respectively.