A special tool for replacing a chain wheel of a tyre crane

Abstract

The utility model belongs to sprocket replacement technical field, specifically disclose a kind of special tool for replacing sprocket of tyre crane, including the hoisting assembly for replacing sprocket, the hoisting assembly includes fixed support plate, fixed support plate one side is fixedly installed with the fixed pin shaft of symmetrical arrangement, the fixed pin shaft outer wall is connected with nut, fixed support plate one end is provided with limit clamping groove, the fixed support plate end far from limit clamping groove side wall is fixedly connected with double rope fixed pulley, utilize the pulley set working principle of double rope fixed pulley and double rope movable pulley composition, through specific steel wire rope winding mode, formula F=1 / 4G is combined Calculation design, the force required to be exerted by operating personnel when pulling steel wire rope is only one fourth of sprocket deadweight, i.e. only need to bear about 10kg tension to realize the lifting of sprocket. Replaced the operation mode of traditional manual direct lifting, gripping sprocket, greatly reduced the physical load of operating personnel.

Description

Technical Field

[0001] This utility model belongs to the field of sprocket replacement technology, specifically relating to a special tool for replacing tire crane sprockets. Background Technology

[0002] As a core piece of equipment in container yard loading and unloading, the trolley traveling mechanism of a rubber-tired gantry crane is a crucial component ensuring its normal movement. The power transmission path of this mechanism is as follows: the motor provides power, the torque is amplified by a reduction gearbox, and then the output shaft of the gearbox outputs torque. This torque is then transmitted to the tires via a chain drive involving sprockets and chains, ultimately enabling the gantry crane to travel. When the sprockets exhibit deformed, broken, missing, or excessively worn teeth, they must be replaced to maintain the normal operation of the trolley traveling mechanism.

[0003] In traditional sprocket replacement operations, due to the sprocket's weight of up to 40kg, the process requires two people to first lift the sprocket onto a ladder platform, and then another person stands on the platform platform to move the sprocket to the gearbox output shaft for docking and installation by hand gripping and pulling. During this process, the sprocket's weight places a significant load on manual operation, and the docking of the sprocket and gearbox output shaft relies on visual observation and manual adjustment, lacking a stable auxiliary positioning structure. This can lead to abnormal lower back strain and sprains due to excessive load, or finger compression due to limited hand space during docking. A loose grip could also cause the sprocket to fall and injure the feet, and there is a risk of personnel falling off the platform platform due to loss of balance. Furthermore, misalignment is prone to occur during the gear meshing stage, and other personnel cannot provide effective assistance, resulting in a lengthy replacement process, affecting the efficiency of equipment restoration to normal operation, and potentially impacting the continuity of port loading and unloading operations. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a special tool for replacing tire sprockets.

[0005] To achieve the above objectives, this utility model provides a special tool for replacing tire sprockets, including a lifting assembly for replacing sprockets. The lifting assembly includes a fixed support plate, on one side of which are fixedly mounted symmetrically arranged fixed pins. Nuts are threaded onto the outer wall of the fixed pins. A limit groove is provided at one end of the fixed support plate, and a double-strand fixed pulley is fixedly connected to the side wall of the fixed support plate away from the limit groove.

[0006] In the above technical solution, a limiting slider is slidably connected to one end of the limiting slot, a steel wire rope is fixedly installed at the lower end of the limiting slider, a double-strand movable pulley is provided at the lower end of the fixed support plate, the end of the steel wire rope away from the limiting slider moves through the inner wheel of the double-strand movable pulley, and the end of the steel wire rope passing through the inner wheel of the double-strand movable pulley moves through the inner wheel of the double-strand fixed pulley.

[0007] In the above technical solution, one end of the wire rope that movably passes through the inner wheel of the double-strand fixed pulley moves through the outer wheel of the double-strand movable pulley, and the other end of the wire rope that passes through the outer wheel of the double-strand movable pulley moves through the outer wheel of the double-strand fixed pulley.

[0008] In the above technical solution, a connecting ring is fixedly installed at the lower end of the double-strand movable pulley, and a binding rope is movably threaded through the connecting ring. The two ends of the binding rope form hoop rings, and one of the hoop rings is fitted with a spring buckle.

[0009] In the above technical solution, the fixed support plate is further designed with a concave structure, and two reinforcing ribs are fixedly installed at the concave part of the fixed support plate corresponding to the double fixed pulley and the limiting slot. A handle is fixedly installed on the upper end of the two reinforcing ribs.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) Utilizing the working principle of a pulley system consisting of a double-strand fixed pulley and a double-strand movable pulley, and through a specific wire rope winding method, combined with the formula F=1 / 4G, the force required for the operator to pull the wire rope is only one-quarter of the weight of the sprocket itself, that is, only about 10kg of pulling force is needed to raise and lower the sprocket. This replaces the traditional method of manually lifting and gripping the sprocket, greatly reducing the physical load on the operator and fundamentally avoiding problems such as abnormal waist stress and finger compression caused by excessive load. It also eliminates the risk of the sprocket falling and injuring the feet due to unstable manual gripping. The operator can complete the operation by pulling the wire rope on the ground or a stable platform, without having to maintain a high-load standing posture on the ladder of the climbing platform, further reducing the possibility of imbalance and falling.

[0011] (2) The tool provides a stable support foundation for the entire pulley system through the precise connection between the fixed pin shaft and the gearbox, and the concave structure of the fixed support plate combined with the design of the reinforcing rib plate, ensuring the stability of force transmission during the lifting and lowering of the sprocket; at the same time, the special fixed steel wire rope is connected to the double-strand moving pulley through the connecting ring, and the sprocket can be firmly bound with the spring buckle to prevent the sprocket from shaking or falling off during the lifting and lowering process. The operator can slowly adjust the lifting speed and position of the sprocket by controlling the tension of the steel wire rope, so that the sprocket mounting hole and the gearbox output shaft can be precisely aligned, effectively solving the problem of tooth meshing misalignment in the traditional docking process. The replacement process does not require multiple people to lift together, and a single person can complete the binding, lifting and docking operation of the sprocket, which significantly shortens the operation time and improves the efficiency of sprocket replacement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure proposed in this utility model; Figure 2 This is a schematic diagram of the fixed support plate structure proposed in this utility model; Figure 3 This is a schematic diagram of the limiting slot and limiting slider structure proposed in this utility model; Figure 4 This is a schematic diagram of the double-strand movable pulley structure proposed in this utility model.

[0013] In the diagram: 1. Fixed support plate, 2. Fixed pin, 3. Nut, 4. Limiting slot, 5. Double-strand fixed pulley, 6. Limiting slider, 7. Steel wire rope, 8. Double-strand movable pulley, 9. Connecting ring, 10. Binding rope, 11. Hoop, 12. Spring buckle, 13. Reinforcing rib plate, 14. Handle. Detailed Implementation To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figures 1-4 The tool shown is a special tool for replacing tire sprockets, including a lifting assembly for replacing sprockets. The lifting assembly includes a fixed support plate 1, a fixed pin 2 symmetrically arranged fixed on one side of the fixed support plate 1, a nut 3 threaded to the outer wall of the fixed pin 2, a limit groove 4 opened at one end of the fixed support plate 1, and a double fixed pulley 5 fixedly connected to the side wall of the fixed support plate 1 away from the limit groove 4. One end of the limiting slot 4 is slidably connected to a limiting slider 6. A steel wire rope 7 is fixedly installed at the lower end of the limiting slider 6. A double-strand movable pulley 8 is provided at the lower end of the fixed support plate 1. The end of the steel wire rope 7 away from the limiting slider 6 moves through the inner wheel of the double-strand movable pulley 8, and the end of the steel wire rope 7 that moves through the inner wheel of the double-strand movable pulley 8 moves through the inner wheel of the double-strand fixed pulley 5. The end of the steel wire rope 7 that moves through the inner wheel of the double-strand fixed pulley 5 moves through the outer wheel of the double-strand movable pulley 8, and the steel wire rope 7 passes through the double-strand movable pulley. One end of the outer wheel 8 moves through the outer wheel of the double-strand fixed pulley 5. A connecting ring 9 is fixedly installed at the lower end of the double-strand movable pulley 8. A binding rope 10 moves through the connecting ring 9. The two ends of the binding rope 10 form hoop rings 11. One of the hoop rings 11 is fitted with a spring buckle 12. The fixed support plate 1 has a concave structure design. Two reinforcing ribs 13 are fixedly installed at the concave part of the fixed support plate 1, corresponding to the double-strand fixed pulley 5 and the limiting slot 4. A handle 14 is fixedly installed on the upper end of the two reinforcing ribs 13.

[0015] Working principle: During the tool positioning and fixing stage, before installing the replacement sprocket, first remove nut 3, then attach the fixing support plate 1 to the preset mounting surface of the gearbox, aligning the fixing pin 2 on one side of the fixing support plate 1 with the gearbox mounting hole. Rotate nut 3, and nut 3 will rotate along the thread on the outer wall of the fixing pin 2 until nut 3 is tightly pressed against the surface of the gearbox, completing the rigid fixing of the fixing support plate 1.

[0016] Among them, the fixed support plate 1 has a concave structure, and a reinforcing rib plate 13 is fixed at the concave part corresponding to the position of the double fixed pulley 5 and the limiting slot 4. The reinforcing rib plate 13 can distribute the force and prevent the fixed support plate 1 from deforming. The handle 14 at the upper end of the reinforcing rib plate 13 makes it easy for the operator to carry the tool and ensures that the fixed pin 2 is accurately aligned with the mounting hole, providing stable support for the subsequent pulley group to bear the force.

[0017] During the sprocket replacement binding stage, before fixing the sprocket, the binding rope 10 is passed through the connecting ring 9 at the lower end of the double-strand moving pulley 8. The hoop 11 formed at both ends of the binding rope 10 is then fitted onto the preset binding position of the sprocket to be replaced using spring buckles 12. Pulling the hoop 11 with the spring buckle 12 tightens the hoop 11 until the binding rope 10 is tightly wrapped around the sprocket without any loose gaps. During this process, the connecting ring 9 acts as a transitional connector between the double-strand moving pulley 8 and the binding rope 10, ensuring that the lifting force of the double-strand moving pulley 8 can be stably transmitted to the sprocket; the spring buckle 12 can quickly tighten and unlock the hoop 11, avoiding the risk of the sprocket falling off and injuring toes during traditional manual lifting, while also ensuring the stability of the sprocket's posture during movement.

[0018] During the sprocket lifting phase, before lifting the sprocket, ensure that the limiting slider 6 slides smoothly within the limiting groove 4. One end of the wire rope 7 is fixed to the lower end of the limiting slider 6, and the other end passes sequentially through the inner wheel of the double-strand movable pulley 8, the inner wheel of the double-strand fixed pulley 5, and the outer wheel of the double-strand movable pulley 8, finally exiting through the outer wheel of the double-strand fixed pulley 5, forming a 4-fold labor-saving structure. The operator pulls the free end of the wire rope 7 from the safety platform. The wire rope 7 slides along the grooves of the double-strand fixed pulley 5 and the double-strand movable pulley 8, causing the double-strand movable pulley 8 to move upward. The double-strand movable pulley 8 pulls the binding rope 10 through the connecting ring 9, and the binding rope 10 in turn drives the sprocket to lift upward synchronously.

[0019] Among them, the double-strand fixed pulley 5 is fixed to the end of the fixed support plate 1, which only changes the direction of force on the wire rope 7; the double-strand movable pulley 8 rises and falls with the sprocket, and the winding method achieves the labor-saving effect of "F=1 / 4G", which completely solves the problems of waist sprain and finger injury caused by traditional manual lifting; the sliding of the limiting slider 6 in the limiting slot 4 can compensate for the length error of the wire rope 7 and prevent the wire rope 7 from breaking due to excessive tension.

[0020] During the precise alignment phase of the sprocket, when the sprocket is aligned with the output shaft of the gearbox, the tension of the wire rope 7 is slowly adjusted to control the lifting speed of the double-strand movable pulley 8, allowing the sprocket to gradually approach the output shaft. If the sprocket position deviates, the operator can fine-tune the angle of the fixed support plate 1 using the handle 14, or use the flexibility of the binding rope 10 to push the side of the sprocket until the sprocket mounting hole is precisely aligned with the output shaft of the gearbox, avoiding misalignment of the tooth grooves caused by traditional "blind alignment". During this process, the reinforcing rib 13 further disperses the local force on the double-strand fixed pulley 5 and the limiting groove 4, ensuring that the fixed support plate 1 does not wobble; the "controllable lifting" characteristic of the double-strand pulley group ensures that the sprocket is always within the operator's field of vision, eliminating the risk of tipping over due to instability while standing on the ladder.

[0021] During the sprocket installation and tool removal phase, when installing the sprocket, maintain a stable tension in the wire rope 7 and push the sprocket axially along the output shaft until the sprocket is fully fitted into the preset position on the output shaft. Then, pull the wire rope 7 in the opposite direction to slowly loosen the double-strand movable pulley 8, allowing the weight of the sprocket to be gradually transferred to the output shaft; unfasten the spring buckle 12, loosen the hoop 11, and remove the binding rope 10; finally, remove the nut 3, and remove the fixed support plate 1, double-strand fixed pulley 5, and other components. During disassembly, the limit slider 6 can be quickly removed from the limit slot 4, completing the entire replacement process.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A special tool for replacing tire sprockets, characterized in that, The lifting assembly includes a fixed support plate (1), a fixed pin (2) is fixedly installed on one side of the fixed support plate (1), a nut (3) is threaded onto the outer wall of the fixed pin (2), a limit groove (4) is opened at one end of the fixed support plate (1), and a double fixed pulley (5) is fixedly connected to the side wall of the fixed support plate (1) away from the limit groove (4).

2. The special tool for replacing tire sprockets according to claim 1, characterized in that, One end of the limiting slot (4) is slidably connected to the limiting slider (6), and a steel wire rope (7) is fixedly installed at the lower end of the limiting slider (6). A double-strand movable pulley (8) is provided at the lower end of the fixed support plate (1). The end of the steel wire rope (7) away from the limiting slider (6) moves through the inner wheel of the double-strand movable pulley (8), and the end of the steel wire rope (7) passing through the inner wheel of the double-strand movable pulley (8) moves through the inner wheel of the double-strand fixed pulley (5).

3. A special tool for replacing tire sprockets according to claim 2, characterized in that, The end of the wire rope (7) that passes through the inner wheel of the double-strand fixed pulley (5) passes through the outer wheel of the double-strand movable pulley (8), and the end of the wire rope (7) that passes through the outer wheel of the double-strand movable pulley (8) passes through the outer wheel of the double-strand fixed pulley (5).

4. A special tool for replacing tire sprockets according to claim 2, characterized in that, The lower end of the double-strand movable pulley (8) is fixedly installed with a connecting ring (9), and a binding rope (10) is movably threaded through the connecting ring (9). The binding rope (10) forms hoop rings (11) at both ends, and one of the hoop rings (11) is fitted with a spring buckle (12).

5. A special tool for replacing tire sprockets according to claim 1, characterized in that, The fixed support plate (1) is designed with a concave structure, and two reinforcing ribs (13) are fixedly installed at the concave part of the fixed support plate (1) corresponding to the double fixed pulley (5) and the limiting slot (4). A handle (14) is fixedly installed on the upper end of the two reinforcing ribs (13).

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