Fixed pulley device for bridge crane

Abstract

The utility model discloses a fixed pulley device for a bridge crane, which belongs to the technical field of hoisting equipment and comprises a fixed pulley block, the fixed pulley block comprises two parallel fixed clamping plates and a fixed pulley spindle erected on the inner sides of the fixed clamping plates, and two sides of a first fixed pulley are respectively provided with a second fixed pulley. The first fixed pulley and the second fixed pulley are the same in radius and thickness, are fixedly connected with the fixed pulley main shaft through bearings, and are arranged in a clearance manner; a U-shaped limiting plate is arranged outside the lower end of the fixed clamping plate, and a plurality of limiting grooves corresponding to the first fixed pulley and the second fixed pulley are formed in a bottom transverse plate of the U-shaped limiting plate. The device has the advantages that the fixed pulleys with the same radius and thickness are arranged, the steel wire rope extends out of the fixed pulleys and then passes through the limiting grooves in the U-shaped limiting plate, steel wire rope abrasion caused by friction between the steel wire rope and the fixed pulleys is prevented, and therefore the service life of the steel wire rope is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting equipment, in particular to a fixed pulley device for a bridge crane. Background Art

[0002] Another name for a bridge crane is a crane. A bridge crane is a lifting device that is horizontally mounted above a workshop, warehouse, or material yard to lift materials. The bridge of a bridge crane runs longitudinally along the tracks laid on the elevated structures on both sides, and the lifting trolley runs transversely along the tracks laid on the bridge, forming a rectangular working range. This allows the space under the bridge to be fully utilized to lift materials without being hindered by ground equipment. This type of crane is widely used in indoor and outdoor warehouses, factories, docks, and open-air storage yards. A fixed pulley is provided on the bridge crane, and a wire rope is wound around the fixed pulley. The lifting of materials is achieved by controlling the lifting of the wire rope.

[0003] Bridge cranes are widely used in the metallurgical industry. Cranes are important auxiliary production processes in the entire production process and play a vital role. Frequent use makes the shaft holes of the fixed pulley blocks easy to wear and the wire ropes easy to break, which brings many inconveniences and losses to production, increases production costs and affects the shipment of steel billets. Due to its structural design, the shaft holes of the crane fixed pulley blocks are easy to wear and the wire ropes are easy to break, which has always been a difficult problem to deal with. The production load of the crane fixed pulley block and the lack of bearings on the middle fixed pulley and the small size of the middle wheel are the main factors for shaft hole wear and wire rope breakage. The breakage of the wire rope increases production costs and workload, and affects the normal use of the overhead crane.

[0004] Patents in the field of fixed pulley technology used in some bridge cranes are disclosed in the prior art, among which the utility model patent with the announcement number CN217578075U discloses a device for preventing the steel wire rope of a fixed pulley of a crown crane from slipping out of the groove, including a bracket, a connecting assembly and a rope blocking assembly, wherein the bracket is connected to the crown crane, the fixed pulley block is suspended on the bracket and can rotate in the circumferential direction, and the fixed pulley of the fixed pulley block is wound with a steel wire rope; the connecting assembly is connected to the bracket and arranged corresponding to the fixed pulley, the connecting assembly is located above the fixed pulley and the connection position is adjustable; the rope blocking assembly is connected to the lower end of the connecting assembly, and is used to prevent the steel wire rope on the fixed pulley from slipping out of the wheel groove, and there is a spacing between the rope blocking assembly and the steel wire rope, and the spacing is adjustable. Although the problem of the steel wire rope of the fixed pulley contacting the pulley axle after slipping out of the groove and the steel wire rope being worn are solved, the fixed pulley still has the problem of wear of the middle axle hole of the fixed pulley block and wear between the steel wire rope and the slide groove before slipping out of the groove in production.

[0005] In view of this, the inventor conducted in-depth research on the need to eliminate the wear of the pulley block shaft hole on the wire rope when the fixed pulley of the bridge crane is in use, and thus the present case was produced. Utility Model Content

[0006] In order to overcome the problem in the prior art that the shaft hole of the pulley block greatly wears the wire rope when the fixed pulley of the bridge crane is used, which affects the production, the utility model provides a fixed pulley device for the bridge crane, including a fixed pulley block, the fixed pulley block including two parallel fixed clamping plates and a fixed pulley main shaft mounted on the inner side of the fixed clamping plates, a first fixed pulley is arranged in the middle of the fixed pulley main shaft, a second fixed pulley is arranged on each side of the first fixed pulley, the first fixed pulley and the second fixed pulley have the same radius and thickness, and the first fixed pulley and the second fixed pulley are fixedly connected to the fixed pulley main shaft through bearings, fixed pulley locking nuts are arranged on both sides of the first fixed pulley and the second fixed pulley, and a gap is set between the first fixed pulley and the second fixed pulley;

[0007] A U-shaped limiting plate is disposed outside the lower end of the fixed clamping plate, and a plurality of limiting grooves are provided on the bottom transverse plate of the U-shaped limiting plate corresponding to the first fixed pulley and the second fixed pulley.

[0008] The first fixed pulley and the second fixed pulley with the same radius and thickness are adopted, and the size of the traditional first fixed pulley with a smaller middle size is changed to the same as that of the second fixed pulleys on both sides, and the fixing method is changed from the original fixed connection to a bearing connection, and the middle fixed pulley is enlarged, the angle of the wire rope is increased, the force is reduced, the relative wear rate of the wire rope is reduced, and the service life of the wire is extended. In addition, a U-shaped limiting plate is arranged under the fixed pulley, and the wire rope is extended from the fixed pulley and then passes through the limiting groove on the U-shaped limiting plate. The wire rope can be clamped through the limiting groove and is not easy to fall off the fixed pulley, so that the wire rope is prevented from being derailed due to friction between the wire rope and the fixed pulley when the wire rope falls off, and the wear and tear of the wire rope caused by the friction between the wire rope and the fixed pulley when the wire rope falls off is prevented. The wire rope is limited to prevent falling off and wear is prevented, thereby extending the service life of the wire rope.

[0009] Furthermore, an annular groove is opened on the circumferential outer wall of the first fixed pulley and the second fixed pulley, the limiting groove is located directly below the annular groove, a steel wire rope is wound on the annular groove, two ends of the steel wire rope respectively pass through the corresponding limiting groove vertically downward, and hooks are fixed to the two ends of the steel wire rope.

[0010] Through the above technical scheme, the two ends of the steel wire rope are respectively passed vertically downward through the corresponding limit grooves, and the steel wire rope is passed through the corresponding limit grooves after it extends from the fixed pulley. The steel wire rope is respectively controlled in the corresponding limit grooves to ensure its verticality with the fixed pulley, and the steel wire rope is limited. This can effectively prevent the steel wire rope from falling out of the groove of the fixed pulley due to oblique lifting and elastic force, and avoid the steel wire rope from falling out of the groove causing wear on the steel wire rope and affecting its use.

[0011] Furthermore, anti-slip rods are installed at the edges of both sides of the fixed splint parallel to the fixed pulley main axis, a spacing is left between the anti-slip rods and the steel wire rope, the anti-slip rods and the fixed pulley main axis are located in the same horizontal plane, and rotating bearings are connected to both ends of the anti-slip rods, and the rotating bearings are fixedly connected to the inner side of the fixed splint.

[0012] Through the above technical solution, anti-drop rods are arranged in front of and behind the fixed pulley to further limit the wire rope in the annular groove, which can protect the wire rope and prevent the pulley wire rope from falling out of the groove and causing wear.

[0013] Furthermore, the open end of the U-shaped limit plate is movably connected to the bottom of the fixed clamp plate, and a connecting hole is provided at the connection between the U-shaped limit plate and the fixed clamp plate. A connecting shaft is provided in the connecting hole, and fixed blocks are provided at both ends of the connecting shaft. The U-shaped limit plate is relatively parallel to the fixed clamp plate and can swing forward and backward or left and right.

[0014] Through the above technical scheme, the fixed splint and the U-shaped limit plate are movably connected through the connecting shaft, and the end surfaces of the fixed splint 1 and the U-shaped limit plate 6 connected to each other are contracted, so that they can be more easily swung back and forth or left and right relative to each other, thereby avoiding wear on the U-shaped limit plate and the fixed splint when the wire rope rotates due to movement when there is a heavy object at the lower end of the wire rope.

[0015] Furthermore, the bridge crane is provided with a crossbeam, a crane support frame is slidably arranged on the crossbeam, the upper end of the fixed clamp is fixedly connected to the bottom end of the crane support frame, and the upper ends of the first fixed pulley and the second fixed pulley are embedded in the bottom of the crane support frame.

[0016] Furthermore, a plurality of reinforcing plates are provided between the outer side surface of the fixing splint and the crane support frame, the top of the reinforcing plate 16 is fixedly connected to the bottom surface of the crane support frame 15 , and the side surface of the reinforcing plate 16 is fixedly connected to the outer side surface of the fixing splint 1 .

[0017] Through the above technical solution, a number of reinforcing plates are arranged between the outer side of the fixing splint and the crane support frame. The arrangement of the reinforcing plates can increase the connection strength between the fixing splint and the crane support frame, while enhancing the strength of the fixing splint itself.

[0018] Furthermore, an observation window is provided at one end of the fixing clamp plate close to the crane support frame.

[0019] Through the above technical solution, an observation window is set on the fixed clamp plate near the fixed pulley main shaft, which is convenient for the operator to observe the matching status of the fixed pulley and the wire rope on the side of the end plate.

[0020] Furthermore, the length of the limiting groove is greater than the diameter of the first fixed pulley and the second fixed pulley.

[0021] Furthermore, main shaft fixing pressure plates are arranged opposite to each other on the inner upper ends of the fixing clamps on both sides, and connecting blocks are arranged opposite to each other on the two main shaft fixing pressure plates, and the connecting blocks are fixedly connected to the fixed pulley main shaft.

[0022] Furthermore, the fixed clamping plate is fixedly connected to the main shaft fixed pressure plate by bolts, and washers are provided between the first fixed pulley and the second fixed pulley, and the washers are sleeved on the fixed pulley shaft.

[0023] Beneficial effects:

[0024] The beneficial effects of the technical solution of the utility model are as follows:

[0025] (1) A first fixed pulley and a second fixed pulley with the same radius and thickness are used. The size of the first fixed pulley is set to be the same as that of the second fixed pulleys on both sides, the fixing method is set to bearing connection, and the middle fixed pulley is enlarged to increase the angle of the wire rope and reduce the force, thereby reducing the wear rate of the wire rope. In addition, a U-shaped limit plate is set below the fixed pulley. After the wire rope extends from the fixed pulley, it passes through the limit groove on the U-shaped limit plate. The wire rope can be clamped through the limit groove and is not easy to fall off the fixed pulley, so as to prevent the wire rope from being derailed due to friction between the wire rope and the fixed pulley when the wire rope falls off. The wire rope is limited to prevent loss of wear and tear, thereby extending the service life of the wire rope.

[0026] (2) The two ends of the wire rope are respectively passed vertically downward through the corresponding limit grooves, and after the wire rope extends out from the fixed pulley, it passes through the corresponding limit grooves. The wire ropes are respectively controlled in the corresponding limit grooves to ensure their verticality with the fixed pulley, and the wire ropes are limited. This can effectively prevent the wire rope from slipping out of the fixed pulley due to oblique lifting and elastic force. At the same time, the front and rear anti-slip rods and the limit grooves on the U-shaped limit plate are set to prevent the wire rope from slipping out of the groove and causing wear on the wire rope, thereby extending the service life of the wire rope.

[0027] (3) By replacing the small pulley with the same size pulleys as those on both sides, two bearings are installed in the pulley shaft holes, so that the fixed pulley in the middle increases the angle of the wire rope, increases the force, decreases the relative wear rate of the wire rope, and extends the service life of the wire. The original fixed pulley block was taken offline after 13 to 16 months, and the service life of the fixed pulley after the modification is changed to 26 to 28 months. The service life of the wire rope is changed from about 3 months to about 4 months after the modification, which effectively avoids the increase in workload, personnel and cost waste caused by replacing the fixed pulley block and wire rope, reduces costs, reduces employee workload, improves equipment operation rate, and provides effective guarantee for non-production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of a fixed pulley device for a bridge crane of the utility model;

[0030] Figure 2 This is a front view of a fixed pulley device for a bridge crane of the utility model;

[0031] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0032] In the figure, 1. fixing splint; 2. fixed pulley main shaft; 3. first fixed pulley; 4. second fixed pulley; 5. fixed pulley lock nut; 6. U-shaped limit plate; 7. limit groove; 8. ring groove; 9. wire rope; 10. hook; 11. anti-drop rod; 12. rotating bearing; 13. connecting shaft; 14. crossbeam; 15. crane support frame; 16. reinforcement plate; 17. observation window; 18. main shaft fixing pressure plate; 19. connecting block; 20. bolt. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] This embodiment adopts a first fixed pulley and two second fixed pulleys with the same radius and thickness, and changes the fixing method from the original fixed connection to a bearing connection. In addition, a U-shaped limit plate is set below the fixed pulley, and the wire rope is extended from the fixed pulley and then passes through the limit groove on the U-shaped limit plate. The limit groove allows the wire rope to be clamped to prevent the wire rope from falling off and the wire rope from being worn due to friction between the wire rope and the fixed pulley, thereby extending the service life of the wire rope. The specific implementation method is as follows:

[0035] Reference Figure 1-3 As shown, a fixed pulley device for a bridge crane includes a fixed pulley block, the fixed pulley block includes two parallel fixed clamping plates 1 and a fixed pulley main shaft 2 mounted on the inner side of the fixed clamping plates 1, a first fixed pulley 3 is arranged in the middle of the fixed pulley main shaft 2, a second fixed pulley 4 is arranged on both sides of the first fixed pulley 3, the first fixed pulley 3 and the second fixed pulley 4 have the same radius and thickness, and the first fixed pulley 3 and the second fixed pulley 4 are fixedly connected to the fixed pulley main shaft 2 through bearings, fixed pulley lock nuts 5 are arranged on both sides of the first fixed pulley 3 and the second fixed pulley 4, and a gap is set between the first fixed pulley 3 and the second fixed pulley 4;

[0036] A U-shaped limiting plate 6 is disposed outside the lower end of the fixed clamping plate 1 , and a plurality of limiting grooves 7 are formed on the bottom transverse plate of the U-shaped limiting plate 6 corresponding to the first fixed pulley 3 and the second fixed pulley 4 .

[0037] Here, a first fixed pulley 3 and a second fixed pulley 4 with the same radius and thickness are adopted. By changing the size of the traditional first fixed pulley 3 with a smaller middle size to the same as the second fixed pulleys 4 on both sides, the fixing method is changed from the original fixed connection to a bearing connection, the middle fixed pulley is enlarged, the angle of the wire rope 9 is increased, the force is reduced, the relative wear rate of the wire rope 9 is reduced, and the service life of the wire is extended. In addition, a U-shaped limiting plate 6 is provided below the fixed pulley, and the wire rope 9 is extended from the fixed pulley and then passes through the limiting groove 7 on the U-shaped limiting plate 6. The wire rope 9 can be clamped by the limiting groove 7 and is not easy to fall off the fixed pulley, so that the wire rope 9 is prevented from being derailed due to friction between the wire rope 9 and the fixed pulley when the wire rope 9 falls off, and the wear and tear of the wire rope 9 caused by the friction between the wire rope 9 and the fixed pulley is prevented. The wire rope 9 is limited and prevented from falling off to prevent wear, thereby extending the service life of the wire.

[0038] In the specific implementation, for a fixed pulley block, the small wheel piece φ360MM without bearing in the middle can be replaced with wheels φ480MM of the same size as those on both sides, and the large wheels with two NJ220 bearings can be installed in the shaft holes of the pulley pieces to complete the work.

[0039] As a preferred embodiment, an annular groove 8 is opened on the circumferential outer wall of the first fixed pulley 3 and the second fixed pulley 4, and the limiting groove 7 is located directly below the annular groove 8. A steel wire rope 9 is wound on the annular groove 8, and both ends of the steel wire rope 9 respectively pass vertically downward through the corresponding limiting groove 7, and hooks 10 are fixed to the two ends of the steel wire rope 9.

[0040] Here, the two ends of the wire rope 9 are respectively passed vertically downward through the corresponding limit grooves 7, and after the wire rope 9 extends out from the fixed pulley, it passes through the corresponding limit grooves 7, and the wire rope 9 is respectively controlled in the corresponding limit grooves 7 to ensure its verticality with the fixed pulley, and the wire rope 9 is limited, which can effectively prevent the wire rope 9 from being derailed from the fixed pulley due to oblique lifting and elastic force, and avoid the wire rope 9 being derailed and causing wear on the wire rope 9, affecting its use.

[0041] As a preferred embodiment, anti-slip rods 11 are installed at the edges of both sides of the fixed splint 1 in parallel with the fixed pulley main shaft 2, with a spacing between the anti-slip rod 11 and the wire rope 9. The anti-slip rod 11 and the fixed pulley main shaft 2 are located in the same horizontal plane, and rotating bearings 12 are connected to both ends of the anti-slip rod 11, which are fixedly connected to the inner side of the fixed splint 1.

[0042] Here, anti-slip rods 11 are arranged in front of and behind the fixed pulley to further limit the wire rope 9 in the annular groove 8, thereby protecting the wire rope 9 and preventing the pulley wire rope 9 from slipping out of the groove and causing wear. In order to facilitate maintenance personnel to repair the fixed pulley and the wire rope 9, the rotating bearings 12 at both ends of the anti-slip rod 11 are detachably connected to the fixed clamping plate 1. In addition, when the limit rod affects the normal operation of the wire rope 9, the limit rod can be replaced to solve the problem. At the same time, by removing the limit rod, it is also convenient for maintenance personnel to repair the fixed pulley and the wire rope 9.

[0043] As a preferred embodiment, the open end of the U-shaped limit plate 6 is movably connected to the bottom of the fixed splint 1, and a connecting hole is provided at the connection between the U-shaped limit plate 6 and the fixed splint 1. A connecting shaft 13 is provided in the connecting hole, and fixed blocks are provided at both ends of the connecting shaft 13. The U-shaped limit plate 6 is relatively parallel to the fixed splint 1 and can swing forward and backward or left and right.

[0044] Here, the fixed splint 1 and the U-shaped limit plate 6 are movably connected through the connecting shaft 13, and the end surfaces of the fixed splint 1 and the U-shaped limit plate 6 connected to each other are contracted, so that they can be more easily swung back and forth or left and right relative to each other, thereby avoiding wear on the U-shaped limit plate 6 and the fixed splint 1 when the wire rope 9 rotates due to movement when there is a heavy object at the lower end of the wire rope 9.

[0045] As a preferred embodiment, a bridge crane is provided with a cross beam 14, on which a crane support frame 15 is slidably arranged, the upper end of the fixed splint 1 is fixedly connected to the bottom end of the crane support frame 15, and the upper ends of the first fixed pulley 3 and the second fixed pulley 4 are embedded in the bottom of the crane support frame 15.

[0046] As a preferred embodiment, a plurality of reinforcing plates 16 are arranged between the outer side surface of the fixed splint 1 and the crane support frame 15 , the top of the reinforcing plate 16 is fixedly connected to the bottom surface of the crane support frame 15 , and the side surface of the reinforcing plate 16 is fixedly connected to the outer side surface of the fixed splint 1 .

[0047] Here, a plurality of reinforcing plates 16 are arranged between the outer side surface of the fixing clamp plate 1 and the crane support frame 15 . The arrangement of the reinforcing plates 16 can increase the connection strength between the fixing clamp plate 1 and the crane support frame 15 , and at the same time enhance the strength of the fixing clamp plate 1 itself.

[0048] As a preferred embodiment, an observation window 17 is provided at one end of the fixing clamp plate 1 close to the crane support frame 15 .

[0049] Here, an observation window is provided on the fixed clamping plate 1 near the fixed pulley main shaft 2, so that the operator can observe the matching state of the fixed pulley and the wire rope 9 at the side of the end plate.

[0050] As a preferred implementation, the length of the limiting groove 7 is greater than the diameter of the first fixed pulley 3 and the second fixed pulley 4 .

[0051] As a preferred embodiment, a main shaft fixing pressure plate 18 is disposed opposite to the inner upper end of the fixing clamp 1 , and connecting blocks 19 are disposed opposite to each other on the two main shaft fixing pressure plates 18 , and the connecting blocks 19 are fixedly connected to the fixed pulley main shaft 2 .

[0052] As a preferred embodiment, the fixed clamping plate 1 is fixedly connected to the main shaft fixed pressure plate 18 by bolts 20, and washers are provided between the first fixed pulley 3 and the second fixed pulley 4, and the washers are sleeved on the fixed pulley shaft.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixed pulley device for a bridge crane, characterized in that: The invention comprises a fixed pulley assembly, wherein the fixed pulley assembly comprises two fixed clamping plates (1) arranged in parallel and a fixed pulley main shaft (2) mounted on the inner side of the fixed clamping plates (1); a first fixed pulley (3) is arranged in the middle of the fixed pulley main shaft (2); a second fixed pulley (4) is arranged on each side of the first fixed pulley (3); the first fixed pulley (3) and the second fixed pulley (4) have the same radius and thickness, and the first fixed pulley (3) and the second fixed pulley (4) are fixedly connected to the fixed pulley main shaft (2) through bearings; fixed pulley locking nuts (5) are arranged on both sides of the first fixed pulley (3) and the second fixed pulley (4); and a gap is set between the first fixed pulley (3) and the second fixed pulley (4); A U-shaped limiting plate (6) is provided on the outside of the lower end of the fixed clamping plate (1), and a plurality of limiting grooves (7) are provided on the bottom transverse plate of the U-shaped limiting plate (6) corresponding to the first fixed pulley (3) and the second fixed pulley (4).

2. A fixed pulley device for a bridge crane according to claim 1, characterized in that: An annular groove (8) is provided on the circumferential outer wall of the first fixed pulley (3) and the second fixed pulley (4), the limiting groove (7) is located directly below the annular groove (8), a steel wire rope (9) is wound on the annular groove (8), and both ends of the steel wire rope (9) respectively pass vertically downward through the corresponding limiting groove (7), and hooks (10) are fixed to the two ends of the steel wire rope (9).

3. A fixed pulley device for a bridge crane according to claim 2, characterized in that: Anti-slip rods (11) are arranged at the edges of both sides of the fixed splint (1) in parallel with the fixed pulley main shaft (2), a spacing is left between the anti-slip rod (11) and the steel wire rope (9), the anti-slip rod (11) and the fixed pulley main shaft (2) are located in the same horizontal plane, and both ends of the anti-slip rod (11) are connected to rotating bearings (12), and the rotating bearings (12) are fixedly connected to the inner side of the fixed splint (1).

4. A fixed pulley device for a bridge crane according to claim 2, characterized in that: The open end of the U-shaped limit plate (6) is movably connected to the bottom of the fixed clamp plate (1), and a connection hole is provided at the connection between the U-shaped limit plate (6) and the fixed clamp plate (1). A connecting shaft (13) is provided in the connection hole, and fixed blocks are provided at both ends of the connecting shaft (13). The U-shaped limit plate (6) is relatively parallel to the fixed clamp plate (1) and can swing forward and backward or left and right.

5. The fixed pulley device for a bridge crane according to claim 1, characterized in that: The bridge crane is provided with a crossbeam (14), a crane support frame (15) is slidably provided on the crossbeam (14), the upper end of the fixed clamping plate (1) is fixedly connected to the bottom end of the crane support frame (15), and the upper ends of the first fixed pulley (3) and the second fixed pulley (4) are embedded in the bottom of the crane support frame (15).

6. A fixed pulley device for a bridge crane according to claim 5, characterized in that: A plurality of reinforcing plates (16) are arranged between the outer side surface of the fixing clamp (1) and the crane support frame (15); the top of the reinforcing plate (16) is fixedly connected to the bottom surface of the crane support frame (15); and the side surface of the reinforcing plate (16) is fixedly connected to the outer side surface of the fixing clamp (1).

7. A fixed pulley device for a bridge crane according to claim 5, characterized in that: An observation window (17) is provided at one end of the fixing clamp (1) close to the crane support frame (15).

8. The fixed pulley device for a bridge crane according to claim 1, characterized in that: The length of the limiting groove (7) is greater than the diameters of the first fixed pulley (3) and the second fixed pulley (4).

9. The fixed pulley device for a bridge crane according to claim 1, characterized in that: A main shaft fixing pressure plate (18) is arranged opposite to the inner upper end of the fixing clamp (1), and connecting blocks (19) are arranged opposite to each other on the two main shaft fixing pressure plates (18), and the connecting blocks (19) are fixedly connected to the fixed pulley main shaft (2).

10. A fixed pulley device for a bridge crane according to claim 9, characterized in that: The fixed clamping plate (1) is fixedly connected to the main shaft fixed pressure plate (18) via bolts (20), and washers are provided between the first fixed pulley (3) and the second fixed pulley (4), and the washers are sleeved on the fixed pulley shafts.

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