Adjustable stroke limiter for crown block

Abstract

The utility model belongs to the technical field of stroke limiters, and particularly relates to an adjustable stroke limiter for a crown block. Comprising a limiter, a touch rod is arranged on the limiter and sleeved with a sleeve frame, a rotating arm is inserted into the sleeve frame, a roller is installed at the upper end of the rotating arm, a plurality of adjusting holes are linearly and evenly distributed in the rotating arm, limiting grooves are formed in the positions, on the two sides of any adjusting hole, of the rotating arm, and a fixing plate which penetrates through and is clamped to the sleeve frame is inserted into the limiting grooves. A screw hole is formed in the sleeve frame, and a bolt penetrating through the fixing plate and the adjusting hole is connected into the screw hole in a threaded mode. According to the utility model, double fixation can be provided for the rotating arm, and the situation that the rotating arm cannot trigger the limiter to act due to the fact that the height of the roller is changed because the bolt is loosened or falls off is prevented, so that the running safety of the crane and the crown block is improved, and the crane and the crown block are prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of travel limiters, and in particular relates to an adjustable travel limiter for a crane. Background Art

[0002] With the development of modern industrial production, cranes, overhead cranes and other lifting equipment are increasingly used in various engineering projects. Travel limiters, also called travel switches, are installed in cranes, overhead cranes and other lifting equipment. They are usually divided into direct-acting type, roller type and other types. The roller of the roller type is installed on a rotating arm. The rotating arm is divided into fixed type and adjustable type. The adjustable rotating arm can adjust the length. The travel limiter structure with adjustable rotating arm length is as follows: the rotating arm is slidably plugged into the sleeve frame, the bolt passes through the bar hole on the rotating arm, and the rotating arm is fixed to the sleeve frame, the sleeve frame is fixed on the trigger rod of the limiter, and the rotating arm drives the trigger rod to rotate, thereby triggering the limiter action. The prior art has the following problems: the fixing method of the rotating arm is bolt fixing. When the bolt is loose, the rotating arm will slide in the sleeve frame, causing the roller height to change, and it cannot touch the limit block, and it cannot trigger the limiter action. In serious cases, it will cause greater damage to the overhead crane and cause safety accidents. Summary of the invention

[0003] The utility model aims to provide an adjustable travel limiter for a crane to solve the problems existing in the prior art.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an adjustable travel limiter for an overhead crane, comprising a limiter, a trigger rod is provided on the limiter, a sleeve frame is sleeved on the trigger rod, a rotating arm is inserted on the sleeve frame, a roller is installed on the upper end of the rotating arm, a plurality of adjustment holes are linearly and evenly distributed on the rotating arm, limit grooves are provided on the rotating arms on both sides of any adjustment hole, a fixing plate penetrating through and clamped on the sleeve frame is inserted in the limit groove, a thread hole is provided on the sleeve frame, and bolts penetrating the fixing plate and the adjustment hole are threadedly connected in the thread hole.

[0005] Furthermore, the trigger rod is circular and the outer wall of the trigger rod is toothed, the sleeve frame is provided with a slot, a star-shaped hole, and a first notch, the wire hole is located at the upper position of the sleeve frame, the star-shaped hole and the first notch are located on the sleeve frame directly below the wire hole, and the middle position of the first notch is connected to the star-shaped hole.

[0006] Furthermore, the shape of the star-shaped hole matches the toothed outer wall of the trigger rod, the sleeve is sleeved on the trigger rod through the star-shaped hole, the inner wall of the star-shaped hole meshes with the outer wall of the trigger rod, and a bolt pair that crosses the first notch is passed through the bottom of the sleeve.

[0007] Furthermore, limiting protrusions are provided on the sleeves on both sides of the lower position of the slot, the rotating arm is inserted into the slot between the limiting protrusion and the sleeve, and the fixing plate is located in the slot above the limiting protrusion and close to the rotating arm.

[0008] Furthermore, the sleeve frame is provided with through holes on both sides of the wire hole, and the shape and position of the through holes correspond to the shape and position of the limiting groove.

[0009] Furthermore, plug-in arms are provided on both sides of the fixed plate, and the ends of the plug-in arms are provided with card joints. A second notch is provided in the middle of the plug-in arms. The fixed plate passes through the limit groove and the through hole through the plug-in arms. The card joint is located on the outside of the sleeve frame, and the fixed plate is clamped to the sleeve frame through the card joint.

[0010] The utility model has the following beneficial effects:

[0011] 1. The utility model can provide double fixation for the rotating arm, preventing the rotating arm from changing the roller height due to loosening or falling off of the bolts, resulting in failure to trigger the limiter action, thereby improving the safety of the crane and overhead crane operation and preventing the crane and overhead crane from being damaged.

[0012] 2. By inserting the bolts into the adjustment holes and then threading the sleeve, the rotating rod will not slide down even if the bolts are loose. Therefore, when the bolts are loose, the height of the roller will not change, thereby preventing the roller from sliding down and failing to trigger the limiter action when the bolts are loose.

[0013] 3. The plug-in arm of the fixed plate is inserted into the limit groove and the through hole, and the card joint is located on the outside of the sleeve. Even if the bolt falls off, the rotating arm will not change its position. The plug-in arm and the bolt provide double fixation for the rotating arm, thereby preventing the problem of failure to trigger the limiter action due to changes in the roller height. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the disassembly structure of the utility model.

[0016] Figure 3 It is a schematic diagram of the structure of the sleeve frame of the utility model.

[0017] Figure 4 It is a structural schematic diagram of a fixed plate of the utility model.

[0018] Among them: 1. limiter; 2. trigger rod; 3. sleeve; 4. rotating arm; 5. roller; 6. adjustment hole; 7. limit slot; 8. fixing plate; 9. thread hole; 10. bolt; 11. slot; 12. star-shaped hole; 13. first notch; 14. bolt pair; 15. limit protrusion; 16. through hole; 17. plug-in arm; 18. card joint; 19. second notch. DETAILED DESCRIPTION

[0019] The utility model will now be further described in detail with reference to the accompanying drawings.

[0020] like Figure 1-4 As shown, an adjustable travel limiter for an overhead crane comprises a limiter 1, a trigger rod 2 is provided on the limiter 1, a sleeve frame 3 is sleeved on the trigger rod 2, a rotating arm 4 is inserted on the sleeve frame 3, a roller 5 is installed on the upper end of the rotating arm 4, a plurality of adjustment holes 6 are linearly and evenly distributed on the rotating arm 4, a limiting groove 7 is provided on the rotating arm 4 on both sides of any adjustment hole 6, a fixing plate 8 penetrating through and clamped on the sleeve frame 3 is inserted in the limiting groove 7, a thread hole 9 is provided on the sleeve frame 3, a bolt 10 penetrating the fixing plate 8 and the adjustment hole 6 is threadedly connected in the thread hole 9.

[0021] Since the bolt 10 is inserted into the adjustment hole 6, even if the bolt 10 is loosened, the rotating rod will not slide downward, so when the bolt 10 is loosened, the height of the roller 5 will not change.

[0022] The trigger rod 2 is circular and the outer wall of the trigger rod 2 is toothed. The sleeve frame 3 is provided with a slot 11, a star-shaped hole 12, and a first notch 13. The wire hole 9 is located at the upper position of the sleeve frame 3. The star-shaped hole 12 and the first notch 13 are located on the sleeve frame 3 directly below the wire hole 9. The middle position of the first notch 13 is connected to the star-shaped hole 12.

[0023] The shape of the star-shaped hole 12 matches the toothed outer wall of the trigger rod 2. The sleeve 3 is sleeved on the trigger rod 2 through the star-shaped hole 12. The inner wall of the star-shaped hole 12 meshes with the outer wall of the trigger rod 2. A bolt pair 14 that crosses the first notch 13 is passed through the bottom of the sleeve 3.

[0024] The engagement of the star-shaped hole 12 and the trigger rod 2 limits the position of the sleeve 3 to prevent the sleeve 3 from rotating on the trigger rod 2. The first notch 13 provides space for the bottom end of the sleeve 3, and the width of the notch can be reduced by tightening the bolt pair 14, so that the engagement of the star-shaped hole 12 and the trigger rod 2 is tighter.

[0025] Limiting protrusions 15 are provided on the sleeve frame 3 on both sides of the lower position of the slot 11, the rotating arm 4 is inserted into the slot 11 between the limiting protrusion 15 and the sleeve frame 3, and the fixing plate 8 is located in the slot 11 above the limiting protrusion 15 and close to the rotating arm 4.

[0026] The limiting protrusion 15 can limit the rotating arm 4 in the slot 11 .

[0027] The sleeve frame 3 is provided with through holes 16 on both sides of the thread hole 9 , and the shape and position of the through holes 16 correspond to the shape and position of the limiting groove 7 .

[0028] Plug arms 17 are provided on both sides of the fixing plate 8, and a clamping joint 18 is provided at the end of the plug-in arm 17. A second notch 19 is provided in the middle of the plug-in arm 17. The fixing plate 8 passes through the limiting groove 7 and the through hole 16 through the plug-in arm 17. The clamping joint 18 is located on the outside of the sleeve frame 3, and the fixing plate 8 is clamped to the sleeve frame 3 through the clamping joint 18.

[0029] Since the plug-in arm 17 of the fixing plate 8 is inserted into the limit groove 7 and the through hole 16, and the clamping joint 18 is located on the outside of the sleeve 3, even if the bolt 10 falls off, the rotating arm 4 will not change its position. Therefore, the plug-in arm 17 and the bolt 10 provide double fixation for the rotating arm 4, thereby preventing the problem of failure to trigger the action of the limiter 1 due to the height change of the roller 5.

[0030] The working principle of the utility model is:

[0031] During installation, align the star-shaped hole 12 of the sleeve 3 with the trigger rod 2 and sleeve it, tighten the bolt pair 14, and then the first notch 13 shrinks, so that the sleeve 3 is tightly clamped on the trigger rod 2. Insert the rotating arm 4 into the slot 11 between the limiting protrusion 15 and the sleeve 3, and adjust the position of the rotating arm 4 so that it can meet the requirements in height. Insert the plug arm 17 of the fixed plate 8 into the limiting groove 7 and the through hole 16. During the plugging process, the second notch 19 shrinks until the clamping joint 18 is located outside the sleeve 3. At this time, the plug arm 17 rebounds, so that the clamping joint 18 clamps the sleeve 3, and the bolt 10 passes through the adjusting hole 6 of the fixed plate 8 and the rotating arm 4, and then is threaded into the thread hole 9. At this time, the rotating arm 4 is fixed in the slot 11.

[0032] During operation, the roller 5 touches the limit stopper on the overhead crane, causing the rotating arm 4 to rotate, thereby driving the trigger rod 2 to rotate through the sleeve 3, thereby triggering the action of the limiter 1. Since the bolt 10 is inserted into the adjustment hole 6, even if the bolt 10 is loose, the rotating rod will not slide downward, so when the bolt 10 is loose, the height of the roller 5 will not change. Since the plug-in arm 17 of the fixing plate 8 is inserted into the limit groove 7 and the through hole 16, and the clamping joint 18 is located outside the sleeve 3, even if the bolt 10 falls off, the rotating arm 4 will not change its position, thereby providing double fixation for the rotating arm 4 through the plug-in arm 17 and the bolt 10, thereby preventing the problem of failure to trigger the action of the limiter 1 due to the height change of the roller 5.

[0033] When it is necessary to adjust the height of the roller 5 again, unscrew the bolt 10, pinch the two sides of the clamping joint 18 at the end of the plug-in arm 17 to shrink the second notch 19, and then push out the fixing plate 8. After adjusting the height of the roller 5, fix the rotating arm 4 on the sleeve frame 3 through the fixing plate 8 and the bolt 10.

[0034] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention.

[0035] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. An adjustable travel limiter for an overhead crane, comprising a limiter, wherein a trigger rod is provided on the limiter, characterized in that: The trigger rod is sleeved with a sleeve frame, the sleeve frame is plugged with a rotating arm, a roller is installed on the upper end of the rotating arm, a number of adjustment holes are linearly and evenly distributed on the rotating arm, and limiting grooves are provided on the rotating arms on both sides of any adjusting hole, and a fixing plate that penetrates and is clamped on the sleeve frame is inserted in the limiting groove, and the sleeve frame is provided with a thread hole, and a bolt that penetrates the fixing plate and the adjusting hole is threaded in the thread hole.

2. The adjustable travel limiter for an overhead crane according to claim 1, characterized in that: The trigger rod is circular and the outer wall of the trigger rod is toothed. The sleeve frame is provided with a slot, a star-shaped hole and a first notch. The wire hole is located at the upper position of the sleeve frame. The star-shaped hole and the first notch are located on the sleeve frame directly below the wire hole. The middle position of the first notch is connected to the star-shaped hole.

3. The adjustable travel limiter for an overhead crane according to claim 2, characterized in that: The shape of the star-shaped hole matches the toothed outer wall of the trigger rod. The sleeve is sleeved on the trigger rod through the star-shaped hole. The inner wall of the star-shaped hole meshes with the outer wall of the trigger rod. A bolt pair that crosses the first notch is passed through the bottom of the sleeve.

4. The adjustable travel limiter for an overhead crane according to claim 2, characterized in that: Limiting protrusions are arranged on the sleeves on both sides of the lower part of the slot, the rotating arm is inserted into the slot between the limiting protrusion and the sleeve, and the fixing plate is located in the slot above the limiting protrusion and close to the rotating arm.

5. The adjustable travel limiter for an overhead crane according to claim 1, characterized in that: The sleeve frame is provided with perforations on both sides of the thread hole, and the shape and position of the perforations correspond to the shape and position of the limiting groove.

6. The adjustable travel limiter for an overhead travelling crane according to claim 5, characterized in that: Plug-in arms are provided at both sides of the fixed plate, and a clamping joint is provided at the end of the plug-in arm. A second notch is provided in the middle of the plug-in arm. The fixed plate passes through the limit groove and the through hole through the plug-in arm. The clamping joint is located outside the sleeve frame, and the fixed plate is clamped to the sleeve frame through the clamping joint.

Images