An angle-adjustable pulley block

Abstract

The utility model relates to a kind of angle-adjustable pulley blocks, including two support plates, pulley axle and pulley, the edge of pulley is located the top outer of support plate, the top of one of support plates is equipped with first rope blocking mechanism, first rope blocking mechanism includes first rope blocking bracket and the arc-shaped through-hole being opened on support plate, arc-shaped through-hole is concentrically arranged with pulley axle, the radial parallel of first rope blocking bracket and pulley axle, and one end of first rope blocking bracket extends to the edge outside of pulley and is equipped with first stop bar, the other end of first rope blocking bracket is provided with first connecting bolt, the screw end of first connecting bolt is slid through first rope blocking bracket and then is threaded through support plate by arc-shaped through-hole, and the screw end of first connecting bolt is equipped with locking nut, first stop bar is parallelly arranged with pulley axle and located the side of first rope blocking bracket close to pulley, the utility model can be adjusted to the position of first stop bar according to the different rope angle of steel wire rope, to facilitate use.

Description

Technical Field

[0001] This utility model belongs to the technical field of lifting equipment parts, and in particular relates to an adjustable pulley block. Background Technology

[0002] Currently, fixed pulley blocks are usually installed on the trolley frame of lifting equipment. During use, when the drum winds up and unwinds the wire rope, the pulley blocks guide the wire rope that passes over its top. To prevent the wire rope from slipping off the pulleys, a stop bar is fixedly installed above the pulleys to improve the stability of the wire rope during the winding and unwinding process.

[0003] However, due to the different exit angles of the wire rope and the fixed position of the stop bar, frictional interference sometimes occurs between the stop bar and the wire rope when the wire rope passes over the pulley. In the existing technology, the stop bar is usually cut off with cutting equipment and then welded to the appropriate position with welding equipment to adjust its position. The whole process is quite cumbersome. In other words, the existing technology is not convenient for adjusting the position of the stop bar according to the different exit angles of the wire rope. Therefore, the existing technology still has its shortcomings and deficiencies. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable pulley system to solve the problems mentioned in the background section.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: An adjustable pulley system includes two vertically opposite and spaced-apart support plates. A horizontally arranged pulley shaft is installed between the two support plates. A rotatable pulley is coaxially mounted on the pulley shaft, with the edge of the pulley located outside the top of the support plate. A first rope-blocking mechanism is installed on the top of one of the support plates. The first rope-blocking mechanism includes a first rope-blocking bracket and an arc-shaped through hole opened on the support plate along the axial direction of the pulley shaft. The arc-shaped through hole is concentric with the pulley shaft. The first rope-blocking bracket is radially parallel to the pulley shaft, and one end of the first rope-blocking bracket extends to the edge of the pulley and is fitted with a first stop rod. The other end of the first rope-blocking bracket is provided with a first connecting bolt. The screw end of the first connecting bolt slides through the first rope-blocking bracket and then passes through the arc-shaped through hole through the support plate. After the screw end of the first connecting bolt passes through the support plate, a locking nut is fitted on it. The first stop rod is parallel to the pulley shaft and located on the side of the first rope-blocking bracket closer to the pulley.

[0006] Furthermore, both ends of the pulley shaft are detachably fixed to the support plate.

[0007] Furthermore, each support plate has a U-shaped notch, the opening of which extends to the edge of the support plate. Both ends of the pulley shaft pass through the support plate through the U-shaped notch and are fitted with U-shaped baffles that are opposite to the U-shaped notch. The U-shaped baffles and the U-shaped notch can form a clamping space to clamp the pulley shaft. The U-shaped baffles and the support plate are connected by several second connecting bolts.

[0008] Furthermore, the openings of the U-shaped notches are all angled upwards.

[0009] Furthermore, one end of the pulley shaft is fitted with a shaft end baffle located outside the U-shaped baffle, and the outer wall of the other end of the pulley shaft is provided with a groove that is opposite to the position of the other U-shaped baffle.

[0010] Furthermore, a second rope-blocking mechanism is also installed on one of the support plates. The second rope-blocking mechanism includes a second rope-blocking bracket, which is radially parallel to the pulley shaft. One end of the second rope-blocking bracket extends to the edge of the pulley and is equipped with a second stop bar. The other end of the second rope-blocking bracket is connected to the support plate by a third connecting bolt. The second stop bar is arranged parallel to the pulley shaft and is located on the side of the second rope-blocking bracket closer to the pulley.

[0011] Furthermore, vertically distributed reinforcing ribs are installed on the side of the support plate away from the pulley.

[0012] The beneficial effects of this utility model by adopting the above technical solution are as follows: In use, the bottom end of the support plate can be welded to the crane trolley frame to fix the position of the pulley block on the crane trolley frame. Then, the wire rope can be passed around the pulley from the top. At this time, when the drum winds up and unwinds the wire rope, the pulley can guide the wire rope. At the same time, the first stop of the first rope-blocking mechanism can prevent the wire rope from slipping off the pulley. When the wire rope is passed around the pulley from the top, if the exit angle of the wire rope causes frictional interference between the first stop and the wire rope, the locking nut can be loosened, and then the position angle of the first rope-blocking bracket can be adjusted along the arc-shaped through hole to adjust the first stop to a suitable position. After adjusting the position of the first stop, the locking nut can be used to lock and fix the position of the first rope-blocking bracket on the support plate to fix the position of the first stop. In other words, compared with the adjustment method in the prior art, this invention can easily adjust the position of the first stop according to different exit angles of the wire rope, which is convenient for use. Attached Figure Description

[0013] Figure 1 This is one of the structural schematic diagrams of this utility model; Figure 2 This is the second structural schematic diagram of the present invention; Figure 3 This is a structural schematic diagram of some of the devices of this utility model in cross-sectional view; Figure 4 This is a schematic diagram of the structure of some parts of the device in the split state; Figure 5 This is a structural diagram of the present invention in its use state; Figure 6 for Figure 5 A magnified structural diagram of part A in the middle.

[0014] Reference numerals: 1. Pulley shaft; 2. First rope-blocking mechanism; 21. First rope-blocking bracket; 22. Arc-shaped through hole; 23. First stop bar; 24. First connecting bolt; 25. Locking nut; 3. Second rope-blocking mechanism; 31. Second rope-blocking bracket; 32. Second stop bar; 33. Third connecting bolt; 4. Support plate; 41. U-shaped notch; 5. U-shaped baffle; 6. Shaft end baffle; 7. Pulley; 8. Bearing; 9. Bushing; 10. Second connecting bolt; 11. Slot; 12. Reinforcing rib; 13. Drum; 14. Wire rope; 15. Lifting trolley frame. Detailed Implementation

[0015] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0016] like Figures 1 to 6 As shown, this utility model provides an adjustable pulley block, including two vertically opposite and spaced support plates 4, with a horizontally arranged pulley shaft 1 installed between the two support plates 4. A rotatable pulley 7 is coaxially mounted on the pulley shaft 1. Specifically, the pulley 7 is mounted on the pulley shaft 1 and rotatably connected to the pulley shaft 1 through a bearing 8. A bushing 9 is coaxially mounted on the pulley shaft 1 located between the pulley 7 and the support plates 4. In use, the bottom end of the support plate 4 can be welded to the crane trolley frame 15 to fix the position of the pulley block on the crane trolley frame 15. Then, the wire rope 14 can be passed around the pulley 7 from the top. At this time, when the drum 13 winds up and unwinds the wire rope 14, the pulley 7 can guide the wire rope 14.

[0017] Furthermore, the edge of the pulley 7 is located outside the top of the support plate 4. A first rope-blocking mechanism 2 is installed on the top of one of the support plates 4. The first rope-blocking mechanism 2 includes a first rope-blocking bracket 21 and an arc-shaped through hole 22 opened on the support plate 4 along the axial direction of the pulley shaft 1. The arc-shaped through hole 22 is concentrically arranged with the pulley shaft 1. The first rope-blocking bracket 21 is radially parallel to the pulley shaft 1. The first rope-blocking bracket 21 can be set on the side of the support plate 4 away from the pulley 7. One end of the first rope-blocking bracket 21 extends to the edge of the pulley 7 and is equipped with a first stop bar 23. The other end of the first rope-blocking bracket 21 is provided with a first connecting bolt 24. The screw end of the first connecting bolt 24 slides through the first rope-blocking bracket 21 and then through the arc-shaped through hole 22. 2. A locking nut 25 is fitted onto the support plate 4 after the screw end of the first connecting bolt 24 passes through the support plate 4. Specifically, by rotating the locking nut 25 until the head of the locking nut 25 and the first connecting bolt 24 are respectively pressed against the two sides of the support plate 4, the position of the first rope-blocking bracket 21 can be fixed on the support plate 4. This makes it easy to install and remove the first rope-blocking mechanism 2 on the support plate 4. By rotating the locking nut 25 in the opposite direction, after loosening the locking nut 25, the position angle of the first rope-blocking bracket 21 can be adjusted along the arc-shaped through hole 22. In addition, the first stop rod 23 is set parallel to the pulley shaft 1 and located on the side of the first rope-blocking bracket 21 near the pulley 7, so that the first stop rod 23 can prevent the wire rope 14 from slipping off the pulley 7.

[0018] When the wire rope 14 passes over the pulley 7 from the top, if the exit angle of the wire rope 14 causes frictional interference between the first stop 23 and the wire rope 14, the locking nut 25 can be loosened. Then, the position angle of the first rope-blocking bracket 21 can be adjusted along the arc-shaped through hole 22 to adjust the first stop 23 to a suitable position. After adjusting the position of the first stop 23, the locking nut 25 can be used to lock and fix the position of the first rope-blocking bracket 21 on the support plate 4 to fix the position of the first stop 23. In other words, compared with the adjustment method in the prior art, this utility model can easily adjust the position of the first stop 23 according to the different exit angles of the wire rope 14 to avoid frictional interference between the first stop 23 and the wire rope 14, thus making it easy to use.

[0019] Furthermore, such as Figures 1 to 6 As shown, both ends of the pulley shaft 1 are detachably fixed to the support plate 4, which makes it easy to assemble and disassemble the pulley shaft 1 and pulley 7 between the two support plates 4.

[0020] The specific arrangement of the detachable and fixed connection between both ends of the pulley shaft 1 and the support plate 4 is as follows: Figures 1 to 6As shown, each support plate 4 has a U-shaped notch 41, the opening of which extends to the edge of the support plate 4. Both ends of the pulley shaft 1 pass through the support plate 4 through the U-shaped notch 41 and are fitted with U-shaped baffles 5 that are opposite to the U-shaped notch 41. The U-shaped baffles 5 and the U-shaped notch 41 can form a clamping space to clamp the pulley shaft 1. The U-shaped baffles 5 and the support plate 4 are connected by several second connecting bolts 10. Specifically, when the U-shaped baffles 5 are connected to the support plate 4, the screw ends of the second connecting bolts 10 pass through the U-shaped baffles 5 and are threaded to the support plate 4. The heads of the second connecting bolts 10 are pressed against the U-shaped baffles 5, which makes it easy to install and remove the U-shaped baffles 5 from the support plate 4.

[0021] When installing the pulley block of this utility model on the crane trolley frame 15, first fix the positions of the two support plates 4, then place the pulley shaft 1 between the two support plates 4 through the opening of the U-shaped notch 41, and then fasten the U-shaped baffles 5 to the ends of the pulley shaft 1 so that the U-shaped baffles 5 and the U-shaped notch 41 cooperate to form a clamping space. After fixing the position of the U-shaped baffles 5 on the support plate 4 with the second connecting bolts 10, the position of the pulley shaft 1 can be clamped and fixed between the two support plates 4, and then the first rope-blocking mechanism 2 is installed. In addition, after removing the first rope-blocking mechanism 2 and the U-shaped baffles 5 in sequence, the pulley shaft 1 and pulley 7 can be removed, which makes it easy to install and remove the pulley shaft 1 and pulley 7 between the two support plates 4.

[0022] Furthermore, such as Figure 1 , Figure 2 , Figures 4 to 6 As shown, the openings of the U-shaped notch 41 are all inclined upwards. In this way, when the pulley shaft 1 is placed between the two support plates 4 from the opening position of the U-shaped notch 41, the two support plates 4 can support the pulley shaft 1, so that the U-shaped baffle 5 can be installed on the support plate 4 later.

[0023] When the pulley shaft 1 is fixed in position by clamping the clamping space between the two support plates 4, in order to prevent the pulley shaft 1 from moving axially, therefore, Figure 1 , Figure 2 and Figures 4 to 6 As shown, a shaft end baffle 6 is installed at one end of the pulley shaft 1, located outside the U-shaped baffle 5. Specifically, the shaft end baffle 6 is coaxially arranged with the pulley shaft 1, and the diameter of the shaft end baffle 6 is larger than the diameter of the pulley shaft 1. A groove 11 is provided on the outer wall of the other end of the pulley shaft 1, which is opposite to the position of the other U-shaped baffle 5. Specifically, the groove 11 can be opened along the circumference of the pulley shaft 1, or grooves 11 can be opened on both sides of the pulley shaft 1. In use, the U-shaped baffle 5 can be locked in the groove 11. In this way, the axial movement of the pulley shaft 1 can be prevented by the cooperation between the groove 11 and the shaft end baffle 6.

[0024] Furthermore, such as Figures 1 to 6 As shown, a second rope-blocking mechanism 3 is also installed on one of the support plates 4. Specifically, the second rope-blocking mechanism 3 and the first rope-blocking mechanism 2 can be located on both sides of the U-shaped notch 41; and in use, as... Figure 5 and Figure 6 As shown, the second rope-blocking mechanism 3 is located on the side of the first rope-blocking mechanism 2 away from the drum 13; the second rope-blocking mechanism 3 includes a second rope-blocking bracket 31, which is radially parallel to the pulley shaft 1, and can be set on the side of the support plate 4 away from the pulley 7; one end of the second rope-blocking bracket 31 extends to the edge of the pulley 7 and is equipped with a second stop bar 32, and the other end of the second rope-blocking bracket 31 is connected to the support plate 4 by a third connecting bolt 33. Specifically, when the second rope-blocking bracket 31 is connected to the support plate 4, the third connecting bolt 33... The screw end passes through the second rope-blocking bracket 31 and is threadedly connected to the support plate 4. The head of the third connecting bolt 33 abuts against the second rope-blocking bracket 31. This facilitates the installation and removal of the second rope-blocking mechanism 3 on the support plate 4 and does not affect the installation and removal of the pulley shaft 1 and pulley 7 between the two support plates 4. The second stop rod 32 is arranged parallel to the pulley shaft 1 and is located on the side of the second rope-blocking bracket 31 near the pulley 7. Specifically, in use, when the wire rope 14 changes its direction of movement after passing around the pulley 7 from the top of the pulley 7, the second stop rod 32 can further prevent the wire rope 14 from slipping off the pulley 7.

[0025] Furthermore, such as Figures 1 to 6 As shown, vertically distributed reinforcing ribs 12 are installed on the side of the support plate 4 away from the pulley 7. Specifically, the bottom surface of the reinforcing ribs 12 can be set to be flush with the bottom surface of the support plate 4. In use, after the position of the support plate 4 is welded and fixed on the crane trolley frame 15, the reinforcing ribs 12 can also be welded and fixed on the crane trolley frame 15 to improve the stability of the support plate 4 on the crane trolley frame 15, thereby ensuring the stability of the pulley block of this utility model during use.

[0026] 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 illustrative of 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adjustable pulley system, comprising two vertically opposite and spaced-apart support plates, a horizontally arranged pulley shaft installed between the two support plates, and a rotatable pulley coaxially mounted on the pulley shaft, characterized in that: The edge of the pulley is located outside the top of the support plate. A first rope-blocking mechanism is installed on the top of one of the support plates. The first rope-blocking mechanism includes a first rope-blocking bracket and an arc-shaped through hole opened on the support plate along the axial direction of the pulley shaft. The arc-shaped through hole is concentric with the pulley shaft. The first rope-blocking bracket is radially parallel to the pulley shaft. One end of the first rope-blocking bracket extends to the edge of the pulley and is equipped with a first stop rod. The other end of the first rope-blocking bracket is equipped with a first connecting bolt. The screw end of the first connecting bolt slides through the first rope-blocking bracket and then passes through the arc-shaped through hole and through the support plate. After the screw end of the first connecting bolt passes through the support plate, a locking nut is fitted on it. The first stop rod is parallel to the pulley shaft and is located on the side of the first rope-blocking bracket closer to the pulley.

2. The adjustable pulley system according to claim 1, characterized in that: Both ends of the pulley shaft are detachably fixed to the support plate.

3. The adjustable-angle pulley system according to claim 2, characterized in that: Each support plate has a U-shaped notch, the opening of which extends to the edge of the support plate. Both ends of the pulley shaft pass through the support plate through the U-shaped notch and are fitted with U-shaped baffles that are opposite to the U-shaped notch. The U-shaped baffles and the U-shaped notches can form a clamping space to clamp the pulley shaft. The U-shaped baffles and the support plates are connected by several second connecting bolts.

4. The adjustable-angle pulley system according to claim 3, characterized in that: The openings of the U-shaped notches are all angled upwards.

5. The adjustable pulley system according to claim 3, characterized in that: One end of the pulley shaft is fitted with a shaft end baffle located outside the U-shaped baffle, and the outer wall of the other end of the pulley shaft is provided with a groove that is opposite to the position of the other U-shaped baffle.

6. An adjustable-angle pulley system according to any one of claims 1-5, characterized in that: One of the support plates is also equipped with a second rope-blocking mechanism. The second rope-blocking mechanism includes a second rope-blocking bracket, which is radially parallel to the pulley shaft. One end of the second rope-blocking bracket extends to the edge of the pulley and is equipped with a second stop bar. The other end of the second rope-blocking bracket is connected to the support plate by a third connecting bolt. The second stop bar is parallel to the pulley shaft and is located on the side of the second rope-blocking bracket closer to the pulley.

7. The adjustable pulley system according to claim 1, characterized in that: The side of the support plate away from the pulley is equipped with vertically distributed reinforcing ribs.

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