A crown block weight limiting device

Abstract

The utility model provides a kind of crown block heavy hammer limiting device, it is related to crown block safety protection equipment field, it includes pulley body, pulley body's outside is equipped with pulley cover, the outside of pulley cover is equipped with heavy hammer support body, the pulley cover includes front side plate, rear side plate and arc plate, the heavy hammer support body includes the heavy hammer support plate below crown block heavy hammer and the support plate frame supported in the bottom of heavy hammer support plate, the support plate frame is provided with two, wherein one support plate frame is fixed with the front side plate of pulley cover by the way of nut compression, another support plate frame is fixed with the rear side plate of pulley cover by the way of nut compression, the utility model solves the technical problem that heavy hammer support structure unilateral connection in prior art causes stress concentration, pulley cover is easy to deform, improves the stability of crown block hoisting operation.

Description

Technical Field

[0001] This utility model relates to the field of crane safety protection equipment, and in particular to a crane counterweight limiting device. Background Technology

[0002] As a key piece of equipment used for material handling in industrial production, the safety and stability of overhead cranes directly affect production efficiency and the safety of personnel and equipment. In the hoisting mechanism of an overhead crane, the counterweight limit device is one of the core safety components. It is mainly used to limit the lifting height of the crane hook by triggering a limit switch through the raising and lowering of the counterweight, preventing serious accidents such as wire rope breakage, hook fall, or damage to the crane structure due to over-winding of the hook.

[0003] Existing overhead crane counterweight limiting devices often use welding to fix the counterweight support structure. For example, Chinese utility model patent CN209468054U discloses an overhead crane counterweight limiting device that uses a support column to fix the hook assembly and the counterweight support plate. The lower end of the support column is welded to the pulley cover of the hook assembly. However, when the counterweight support plate is subjected to the heavy impact of the counterweight for a long time, the weld at the connection between the support column and the hook assembly is prone to cracking, leading to counterweight support failure. In contrast, existing technologies also use bolts to fix the support structure to one side of the pulley cover and set the counterweight support plate at the upper end of the support structure.

[0004] However, the above-mentioned existing technology still has the following defects. Since the support structure is only connected to one side of the pulley cover, the force will be concentrated in a local area of ​​the pulley cover. Long-term use will easily cause the pulley cover to deform, affecting the normal rotation of the pulley and indirectly reducing the stability of the crane's lifting operation. Utility Model Content

[0005] This application provides a crane counterweight limiting device, which solves the technical problems of stress concentration and easy deformation of pulley cover caused by unilateral connection of the counterweight support structure in the prior art, and improves the stability of crane lifting and operation.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a crane counterweight limiting device, comprising a pulley body, a pulley cover installed on the outside of the pulley body, and a counterweight support body installed on the outside of the pulley cover. The pulley cover includes a front side plate, a rear side plate, and an arc-shaped plate. The counterweight support body includes a counterweight support plate located below the crane counterweight and a support plate frame supported at the bottom of the counterweight support plate. Two support plate frames are provided, one of which is fixed to the front side plate of the pulley cover by tightening with a nut, and the other support plate frame is fixed to the rear side plate of the pulley cover by tightening with a nut.

[0007] When this device is in operation, as the crane hook rises to its top limit position driven by the hoisting mechanism, the crane counterweight contacts the counterweight support plate. Simultaneously, the counterweight triggers a limit switch via a lead wire, stopping the hook's ascent. Because the counterweight support uses two symmetrically distributed support plates, with one fixed to the front plate of the pulley cover and the other to the rear plate, the weight of the crane counterweight is distributed across two different parts of the pulley cover, rather than being concentrated in a single localized area. This effectively avoids the problem of localized stress concentration in the pulley cover caused by a single-sided connection of the counterweight support structure in existing technologies, thus contributing to the stability of the crane operation.

[0008] As a further improvement to the above solution, each of the pallet frames includes a vertical support and a horizontal support, both of which are elongated structures. The length of the horizontal support is adapted to the length of the corresponding edge of the counterweight pallet. The horizontal support is vertically arranged at the upper end of the vertical support. The two horizontal supports are respectively attached and fixed to the two side edges of the counterweight pallet.

[0009] As a further improvement to the above solution, the lower part of the vertical support has two screw holes spaced vertically along its length; two studs are fixed on the surface of the front side plate and the surface of the rear side plate; one end of the stud is welded and fixed to the corresponding mounting plane, and the other end extends horizontally and passes through the screw hole at the corresponding position on the vertical support, and a first nut is sleeved on the outer side of the end of the stud extending out of the screw hole; the vertically spaced screw holes and studs can evenly transfer the heavy load borne by the vertical support to the front or rear side plate of the pulley cover, preventing the load from being concentrated at a single connection point, which could cause damage such as screw hole deformation or stud breakage; at the same time, the way the nuts are tightened facilitates disassembly and replacement of the device during later maintenance.

[0010] As a further improvement to the above solution, a U-shaped groove is formed in the middle of one side edge of the counterweight support plate, the opening of the U-shaped groove faces the lifting wire rope, and the width of the U-shaped groove is greater than the diameter of the lifting wire rope; the two opposite side edges of the counterweight support plate are bent downwards in a direction perpendicular to the surface of the counterweight support plate to form a bent portion, and the inner sidewall of the bent portion is in contact with the cross brace; multiple through holes are spaced apart along the length of the bent portion, and the cross brace of the support plate frame is also provided with through holes corresponding to the through holes of the bent portion, and one end of the bolt passes through the through holes on the cross brace and the through holes on the bent portion in sequence and is fitted with a second nut.

[0011] As a further improvement to the above solution, the through hole on the cross brace is a circular hole, and the through hole on the bent part is a strip-shaped hole, with the length direction of the strip-shaped hole being consistent with the length direction of the cross brace; thus, during the assembly process of the counterweight support plate and the cross brace, the horizontal position of the counterweight support plate can be flexibly and finely adjusted along the length direction of the strip-shaped hole to ensure that the counterweight support plate is always accurately aligned with the bottom of the overhead crane counterweight.

[0012] As a further improvement to the above solution, each of the pallet racks also includes a diagonal brace, one end of which is fixed to the vertical brace by welding, and the other end of which is fixed to the end of the horizontal brace away from the vertical brace by welding; thereby enhancing the overall structural rigidity and load-bearing capacity of the pallet rack.

[0013] As a further improvement to the above solution, an anti-winding component is also included on one side of the overhead crane counterweight. The anti-winding component includes two transverse support rods and two longitudinal support rods. The two transverse support rods are parallel to each other and spaced apart, and the two longitudinal support rods are parallel to each other and spaced apart. The two longitudinal support rods and the two transverse support rods work together to form a closed rectangular frame structure. The internal space dimension of the rectangular frame structure is larger than the outer diameter of the overhead crane lifting wire rope. Thus, during the lifting or lowering of the overhead crane, it can effectively prevent the lifting wire rope from winding onto the overhead crane counterweight due to swaying or swinging.

[0014] As a further improvement to the above solution, a rotating sleeve is fitted on the outside of both the transverse support and the longitudinal support. The rotating sleeve is a cylindrical sleeve structure and can rotate around the axis of the transverse support or the longitudinal support.

[0015] As a further improvement to the above solution, two sets of anti-winding components are provided at intervals along the height direction on one side of the crane counterweight; one set of anti-winding components is located at the upper part of the crane counterweight, and the other set of anti-winding components is located at the lower part of the crane counterweight.

[0016] As can be seen from the above technical solutions, this utility model has at least the following technical effects or advantages: When this device is in operation, as the crane hook rises to its top limit position driven by the hoisting mechanism, the crane counterweight contacts the counterweight support plate. Simultaneously, the counterweight triggers a limit switch via a lead wire, stopping the hook's ascent. Because the counterweight support uses two symmetrically distributed support plates, with one fixed to the front plate of the pulley cover and the other to the rear plate, the weight of the crane counterweight is distributed across two different parts of the pulley cover, rather than being concentrated in a single localized area. This effectively avoids the problem of localized stress concentration in the pulley cover caused by a single-sided connection of the counterweight support structure in existing technologies, thus contributing to the stability of the crane operation. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram illustrating the use of this utility model; Figure 2 This is a schematic diagram of the structure of the counterweight support. Figure 3 This is a schematic diagram of the structure of the counterweight support plate; Figure 4 This is a structural diagram of the pallet rack; Figure 5 for Figure 1 A magnified view of a portion of point A in the middle; Figure 6 for Figure 1 A magnified view of a portion of point B in the middle.

[0018] Explanation of reference numerals in the attached drawings: 1. Pulley cover; 101. Front side plate; 102. Rear side plate; 103. Arc-shaped plate; 2. Pulley body; 3. Counterweight support body; 4. Crane counterweight; 5. Counterweight support plate; 6. Support plate frame; 7. Vertical brace; 8. Horizontal brace; 9. Screw hole; 10. Stud; 11. First nut; 12. U-shaped groove; 13. Bend; 14. Second nut; 15. Circular hole; 16. Strip hole; 17. Diagonal brace; 18. Horizontal support rod; 19. Longitudinal support rod; 20. Lifting wire rope; 21. Rotating sleeve. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0020] This utility model discloses a crane counterweight limiting device, which includes a pulley cover 1, a pulley body 2 installed inside the pulley cover 1, and a counterweight support body 3 installed outside the pulley cover 1. The pulley cover 1 includes a front side plate 101, a rear side plate 102, and an arc-shaped plate 103. The counterweight support body 3 includes a counterweight support plate 5 and a support frame 6 supported at the bottom of the counterweight support plate 5. Two support frames 6 are provided.

[0021] In this embodiment, as Figure 1As shown, the pulley cover 1 has a semi-enclosed cover structure. The front side plate 101 and rear side plate 102 are both fan-shaped flat structures, located at opposite ends of the pulley body 2 along its axial direction. An arc-shaped plate 103 is located between the front and rear side plates 101 and 102, and its curvature matches the outer radius of the pulley body 2. The counterweight support 3 is installed on the outer wall of the pulley cover 1, directly below the overhead crane counterweight 4. When the overhead crane hook assembly rises to its upper limit position, the counterweight support 3 can support the bottom of the overhead crane counterweight 4. Two support plates 6 are connected to different parts of the pulley cover 1. One support plate 6 is fixed to the front side plate 101 with a nut; the other support plate 6 is fixed to the surface of the rear side plate 102 with a nut. The two support plates 6 are symmetrically distributed and together support the upper counterweight support plate 5.

[0022] When the crane is working, the crane counterweight 4 is linked to the limit switch above the device through the counterweight lead wire. When the hook rises to the top limit position, the counterweight support plate 5 contacts the crane counterweight 4, triggering the limit switch to stop the hook from rising. At this time, the weight of the crane counterweight 4 is borne by the two support plates 6.

[0023] In the above structure, by setting two support brackets 6, which are fixed to the front side plate 101 and the rear side plate 102 respectively, the force of the counterweight support 3 is distributed to different parts on both sides of the pulley cover 1, avoiding the problem of force concentration caused by the support structure being connected to only one side of the pulley cover 1 in the prior art. This method of distributing the force can effectively reduce the load on the local area of ​​the pulley cover 1, prevent the pulley cover 1 from deforming after long-term use, ensure the normal rotation of the pulley body 2, thereby improving the operational stability of the overhead crane hoisting mechanism and reducing the risk of equipment failure caused by deformation of the pulley cover 1.

[0024] In the specific structure of the counterweight support 3, such as Figure 2 , Figure 4 As shown, each of the pallet frames 6 includes a vertical support 7 and a horizontal support 8. The vertical support 7 is a long strip structure, and the horizontal support 8 is also a long strip structure. The length of the horizontal support 8 is adapted to the edge length of the counterweight pallet 5. The horizontal support 8 is vertically welded to the upper end of the vertical support 7 or is integral with the vertical support 7. The vertical support 7 and the horizontal support 8 together form an "L" shape. The edge of the counterweight pallet 5 is attached to the upper surface of the horizontal support 8 and is fixed by welding or bolt connection. If bolt connection is used, corresponding through holes are pre-set on the edge of the counterweight pallet 5 and the horizontal support 8. The bolt is passed through the through hole and tightened to fix the two. In the above structure, the vertical support 7 can transfer the weight of the horizontal support 8 and the counterweight pallet 5 to the pulley cover 1, while the horizontal support 8 can provide a stable support surface for the counterweight pallet 5.

[0025] In the connection structure between the counterweight support 3 and the pulley cover 1, the lower part of the vertical support 7 is provided with two screw holes 9, and the front side plate 101 and the rear side plate 102 are fixed with two studs 10. The studs 10 pass through the screw holes 9 and are tightened and fixed with the first nut 11.

[0026] Specifically, such as Figure 2 , Figure 5 As shown, the two screw holes 9 at the bottom of the vertical support 7 are distributed vertically along the length of the vertical support 7, and the inner diameter of the screw holes 9 matches the outer diameter of the studs 10. One end of the studs 10 is fixed to the surface of the front side plate 101 and the rear side plate 102 by welding, and the distance between the two studs 10 is consistent with the distance between the two screw holes 9 on the vertical support 7. When the vertical support 7 is in contact with the mounting surface, the studs 10 pass through the screw holes 9. At this time, the first nut 11 is put on the end of the stud 10 that extends out of the screw hole 9, and the first nut 11 is tightened with a wrench. The clamping force generated by the threaded engagement between the first nut 11 and the stud 10 can fix the vertical support 7 on the mounting surface. To enhance the fixing effect, a spring washer can also be installed between the first nut 11 and the vertical support 7. The spring washer can play an anti-loosening role and prevent the first nut 11 from loosening due to long-term vibration.

[0027] like Figure 3 As shown, a U-shaped groove 12 is provided on one side of the counterweight support plate 5, and the two opposite edges of the counterweight support plate 5 are bent downward to form a bent part 13. Both the bent part 13 and the cross brace 8 of the support plate frame 6 are provided with through holes. After the bolt passes through the through hole of the bent part 13 and the through hole of the support plate frame 6, it is tightened and fixed with the second nut 14.

[0028] Specifically, the size of the counterweight support plate 5 is larger than the vertical projection size of the overhead crane counterweight 4 to ensure that the overhead crane counterweight 4 can be stably placed on the counterweight support plate 5. A U-shaped groove 12 is formed in the middle of one side edge of the counterweight support plate 5, with the opening of the U-shaped groove 12 facing one side of the pulley cover 1. The groove width is larger than the diameter of the lifting wire rope 20 so that the lifting wire rope 20 can pass through the U-shaped groove 12, avoiding interference between the counterweight support plate 5 and the lifting wire rope 20. The bending portion 13 is formed by bending the two opposite edges of the counterweight support plate 5 downwards by 90 degrees, and the bending portion 13 fits snugly against the outer wall of the cross brace 8. The through holes on the bent part 13 correspond one-to-one with the through holes on the cross brace 8. The inner diameter of the through holes is adapted to the outer diameter of the connecting bolts. When the bent part 13 is attached to the outer wall of the cross brace 8, the bolts pass through the through holes of the bent part 13 and the cross brace 8 in sequence. The second nut 14 is put on the other end of the bolt and tightened, thereby firmly connecting the counterweight plate 5 and the cross brace 8 of the plate frame 6.

[0029] In the above structure, the U-shaped groove 12 avoids interference between the counterweight support plate 5 and the lifting wire rope 20, ensuring that the lifting wire rope 20 can operate normally and does not affect the operation of the crane hoisting mechanism. The bending part 13 is connected to the cross brace 8 by bolts and a second nut 14, which can improve the firmness of the connection between the counterweight support plate 5 and the support plate frame 6 and prevent the counterweight support plate 5 from shifting or falling off when bearing the weight of the crane counterweight 4.

[0030] Furthermore, the through hole on the cross brace 8 is a circular hole 15, and the through hole on the bent portion 13 is a strip-shaped hole 16, the length direction of the strip-shaped hole 16 being consistent with the length direction of the cross brace 8. For example... Figure 2 , Figure 3 As shown, the circular hole 15 on the cross brace 8 is a standard circular hole with a fixed position, and its diameter matches the outer diameter of the connecting bolt. The strip hole 16 on the bent part 13 is an elongated through hole, and the width of the strip hole 16 is consistent with the diameter of the circular hole 15. When connecting the counterweight plate 5 to the cross brace 8, the bolt first passes through the circular hole 15 of the cross brace 8, and then through the strip hole 16 of the bent part 13. At this time, the position of the counterweight plate 5 can be slightly adjusted along the length of the strip hole 16 according to the actual situation, so that the counterweight plate 5 can be aligned with the bottom of the overhead crane counterweight 4. After adjusting it into place, tighten the second nut 14 to complete the fixing.

[0031] like Figure 4 , Figure 5 As shown, each of the pallet frames 6 also includes a diagonal brace 17. The diagonal brace 17 is rod-shaped, with one end welded to the middle of the vertical support 7 and the other end welded to the bottom of the horizontal support 8 away from the vertical support 7, forming a triangular structure together. In the above structure, the diagonal brace 17 can improve the overall structural strength and load-bearing capacity of the pallet frame 6. When the counterweight pallet 5 bears the weight of the overhead crane counterweight 4, the diagonal brace 17 can effectively share the load, prevent the vertical support 7 and the horizontal support 8 from deforming or being damaged, extend the service life of the pallet frame 6, and further ensure the support stability of the counterweight support body 3.

[0032] On the other hand, the device also includes an anti-winding assembly located on one side of the overhead crane counterweight 4. The anti-winding assembly includes two transverse support rods 18 and a longitudinal support rod 19 vertically connected between the two transverse support rods 18. Two longitudinal support rods 19 are provided and cooperate with the transverse support rods 18 to form a closed frame structure. The frame structure formed by the longitudinal support rods 19 and the transverse support rods 18 can be looped around the outside of the overhead crane's lifting wire rope 20. Figure 1 , Figure 6As shown, both the transverse support rod 18 and the longitudinal support rod 19 are rods. The two transverse support rods 18 are parallel to each other, and the two longitudinal support rods 19 are parallel to each other. The two ends of the transverse support rod 18 are connected to the ends of the two longitudinal support rods 19 by bolts, forming a rectangular closed frame structure. The internal space of the frame structure is slightly larger than the outer diameter of the lifting wire rope 20, allowing the lifting wire rope 20 to move freely inside the frame structure while preventing it from coming off the side of the frame structure. In the above structure, the frame structure of the anti-winding component loops around the outside of the lifting wire rope 20, which can limit and guide the lifting wire rope 20, preventing it from getting tangled on the crane counterweight 4 due to swaying or other reasons during the lifting or lowering of the crane, and avoiding the crane counterweight 4 from being unable to rise or fall normally due to wire rope entanglement.

[0033] like Figure 6 As shown, rotating sleeves 21 are rotatably mounted on the outside of the transverse support rod 18 and the longitudinal support rod 19. The rotating sleeve 21 is a cylindrical sleeve structure with an inner diameter slightly larger than the outer diameter of the transverse support rod 18 and the longitudinal support rod 19, allowing it to fit over the outside of these rods and rotate freely. When the lifting wire rope 20 moves inside the frame structure and comes into contact with the rotating sleeve 21, the rotating sleeve 21 rotates synchronously with the movement of the lifting wire rope 20, converting the sliding friction between the lifting wire rope 20 and the support rods into rolling friction. Therefore, the rotating sleeve 21 effectively reduces the frictional resistance and wear between the lifting wire rope 20 and the transverse and longitudinal support rods 18 and 19. This makes the movement of the lifting wire rope 20 smoother, reduces the operating resistance of the overhead crane hoisting mechanism, and prevents wear and wire breakage caused by long-term sliding friction, extending the service life of the lifting wire rope 20 and reducing equipment maintenance costs.

[0034] like Figure 1 , Figure 6 As shown, two sets of anti-winding components are provided on one side of the overhead crane counterweight 4. These two sets of anti-winding components are distributed vertically along the height of the overhead crane counterweight 4, with one set near the upper part and the other near the lower part. The two sets of anti-winding components have identical structures and are both looped around the outside of the same lifting wire rope 20, thus forming a double limiting mechanism. When the lifting wire rope 20 sways, the upper and lower sets of anti-winding components can constrain the overhead crane counterweight 4 from different heights, preventing the wire rope from winding throughout the entire height range of the overhead crane counterweight 4.

[0035] The working process of this device: During crane operation, the crane counterweight 4 is linked to the limit switch via its lead wire. When the hook rises to its top limit position under the drive of the hoisting mechanism, the counterweight support plate 5 of the counterweight support 3 contacts the crane counterweight 4. The change in the lead wire triggers the limit switch, which then sends a stop signal to the crane control system. The control system cuts off the power source of the hoisting mechanism, and the hook stops rising. This device uses two support plates 6, which are fixed to the front side plate 101 and the rear side plate 102 respectively, to distribute the weight of the crane counterweight 4 to different parts of the pulley cover 1. This effectively solves the problem of force concentration caused by single-sided connection in the prior art, avoids deformation of the pulley cover 1 after long-term use, and ensures that the pulley body 2 always rotates normally.

[0036] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A crane counterweight limiting device, comprising a pulley body (2), a pulley cover (1) installed on the outside of the pulley body (2), and a counterweight support body (3) installed on the outside of the pulley cover (1), wherein the pulley cover (1) comprises a front side plate (101), a rear side plate (102) and an arc-shaped plate (103). Its features are, The counterweight support (3) includes a counterweight plate (5) located below the overhead crane counterweight (4) and a plate frame (6) supported at the bottom of the counterweight plate (5). There are two plate frames (6). One plate frame (6) is fixed to the front side plate (101) of the pulley cover (1) by tightening with a nut, and the other plate frame (6) is fixed to the rear side plate (102) of the pulley cover (1) by tightening with a nut.

2. The overhead crane counterweight limiting device according to claim 1, characterized in that, Each of the pallet frames (6) includes a vertical support (7) and a horizontal support (8), both of which are elongated structures. The length of the horizontal support (8) is adapted to the length of the corresponding edge of the counterweight pallet (5). The horizontal support (8) is vertically arranged at the upper end of the vertical support (7). The two horizontal supports (8) are respectively attached and fixed to the two side edges of the counterweight pallet (5).

3. The overhead crane counterweight limiting device according to claim 2, characterized in that, The lower part of the vertical support (7) has two screw holes (9) spaced vertically along its length; the front side plate (101) and the rear side plate (102) are each fixed with two studs (10); one end of the stud (10) is welded and fixed on the corresponding mounting plane, and the other end extends horizontally and passes through the screw hole (9) at the corresponding position on the vertical support (7), and a first nut (11) is sleeved on the outer side of the end of the stud (10) extending out of the screw hole (9).

4. The overhead crane counterweight limiting device according to claim 3, characterized in that, A U-shaped groove (12) is provided in the middle of one side edge of the counterweight support plate (5). The opening of the U-shaped groove (12) faces the lifting wire rope (20), and the groove width of the U-shaped groove (12) is greater than the diameter of the lifting wire rope (20). The two opposite side edges of the counterweight support plate (5) are bent downwards in a direction perpendicular to the plate surface of the counterweight support plate (5) to form a bent part (13). The inner side wall of the bent part (13) is in contact with the cross brace (8). Multiple through holes are provided on the bent part (13) at intervals along its own length direction. The cross brace (8) of the support plate frame (6) is also provided with through holes at the positions corresponding to the through holes of the bent part (13). One end of the bolt passes through the through holes on the cross brace (8) and the through holes on the bent part (13) in sequence and is fitted with a second nut (14).

5. The overhead crane counterweight limiting device according to claim 4, characterized in that, The through hole on the cross brace (8) is a circular hole (15), and the through hole on the bent part (13) is a strip hole (16). The length direction of the strip hole (16) is consistent with the length direction of the cross brace (8).

6. A crane counterweight limiting device according to any one of claims 2 to 5, characterized in that, Each of the tray frames (6) also includes a diagonal brace (17), one end of which is fixed to the vertical brace (7) by welding, and the other end of which is fixed to the end of the horizontal brace (8) away from the vertical brace (7) by welding.

7. The overhead crane counterweight limiting device according to claim 1, characterized in that, It also includes an anti-winding component set on one side of the overhead crane counterweight (4). The anti-winding component includes two transverse support rods (18) and two longitudinal support rods (19). The two transverse support rods (18) are parallel to each other and spaced apart. The two longitudinal support rods (19) are parallel to each other and spaced apart. The two longitudinal support rods (19) and the two transverse support rods (18) work together to form a closed rectangular frame structure. The internal space dimension of the rectangular frame structure is larger than the outer diameter of the overhead crane lifting wire rope (20).

8. A crane counterweight limiting device according to claim 7, characterized in that, The transverse support rod (18) and the longitudinal support rod (19) are both fitted with rotating sleeves (21). The rotating sleeves (21) are cylindrical sleeve structures and can rotate around the axis of the transverse support rod (18) or the longitudinal support rod (19).

9. A crane counterweight limiting device according to claim 7, characterized in that, Two sets of anti-winding components are provided at intervals along the height direction on one side of the overhead crane weight (4); one set of anti-winding components is located at the upper part of the overhead crane weight (4), and the other set of anti-winding components is located at the lower part of the overhead crane weight (4).

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