A clutch-switching self-locking device for traction chain travel in wire tensioners or hoists.

Abstract

This utility model discloses a clutch-operated chain-locking device for a tensioner or hoist, comprising a housing, a handwheel, a push-back lever, a locking block, an unlocking lever, and a clutch shaft, a rear reduction gear shaft, a clutch elastic element, and at least one clutch elastic element mounting seat mounted on a wall panel. The push-back lever is fixed to the handwheel and screwed into a screw hole in the housing. One end of the locking block is elastically pivotally mounted on the handwheel, and the other end is fixed to the unlocking lever, which rests in a limiting groove on the handwheel. The clutch shaft has at least one clutch shaft pinion. The rear reduction gear shaft has a rear reduction gear and a rear reduction gear shaft pinion. The sprocket shaft has a spline-connected final reduction gear, a sprocket, and a chain wound on the sprocket. The clutch elastic element abuts against the clutch shaft and the clutch elastic element mounting seat. This device ensures that the chain cannot be switched arbitrarily under load, guaranteeing safety during tensioning or lifting. It allows for unlocking and disengaging of the fast chain under no-load conditions.

Description

Technical Field

[0001] This utility model relates to a clutch switching traction chain self-locking device for tensioners or hoists, belonging to the field of traction and lifting technology. Background Technology

[0002] Patent CN112623983A discloses a chain traction and hoisting machine with an electric direct drive brake. This technical solution can only decelerate the chain under load and cannot quickly drag the chain under no-load conditions. After the high-altitude operation is completed, it cannot quickly drag the chain and thus cannot quickly lower the hook to the lifting position. It can only rely on the inefficient deceleration chain movement to lower the hook, which has the disadvantage of long operation preparation time. Of course, it also does not have the function of locking the fast chain dragging during the entire process of tensioning or lifting operations.

[0003] The unloaded fast-moving chain mode and the loaded chain-moving mode require the disengagement and re-engagement of the deceleration transmission chain. The re-engagement process requires the cooperation of the clutch spring to effectively ensure engagement. However, during the development process, the applicant encountered abnormal working conditions of the clutch spring, such as clutch spring torsion and offset. When the clutch shaft rotates while maintaining axial preload, the clutch spring will generate an unfavorable torsional posture, making it difficult to maintain the normal preload of the clutch spring. This results in poor stability of frequent clutch spring compression deformation and reset, ultimately leading to poor completion of the gear disengagement and engagement switching action. Utility Model Content

[0004] The purpose of this invention is to provide a self-locking device for the chain movement of a tensioner or hoist that ensures the chain cannot be switched to a fast traction chain under load conditions, while also being able to be unlocked to allow for disengagement of the transmission and adapt to fast traction chain operation under no-load conditions.

[0005] Therefore, the technical solution provided by this utility model is as follows: a clutch switching traction chain self-locking device for a tensioner or hoist, comprising a cover, a handwheel, a push-back lever, a locking block, an unlocking lever, and a clutch shaft, a rear reduction gear shaft, a sprocket shaft, a clutch elastic element, and at least one clutch elastic element mounting seat, wherein the push-back lever is fixed to the handwheel and threadedly engaged with a screw hole in the cover, one end of the locking block is elastically pivotally mounted on the handwheel, and the other end is axially mounted on the handwheel. The clutch is fixed on the unlocking lever, which rests in the limiting groove of the handwheel. The clutch shaft is equipped with at least a clutch shaft pinion. The rear reduction gear shaft is equipped with a rear reduction gear and a rear reduction gear shaft pinion. The sprocket shaft is equipped with a spline-connected final reduction gear, a sprocket, and a chain wound on the sprocket. The push rod, clutch shaft, clutch elastic element, and clutch elastic element mounting seat are arranged coaxially. The clutch elastic element mounting seat is located on the wall panel, and the clutch elastic element abuts against the clutch shaft and the clutch elastic element mounting seat respectively.

[0006] When relocking is required, in order to improve the responsiveness of the locking block returning to the locked position, one end of the locking block is elastically pivotally mounted on the handwheel via a torsion spring and a locking block pin. Specifically, one end of the locking block is axially fixed to the locking block pin, and the locking block pin is fixedly connected to the handwheel; the torsion spring is sleeved on the locking block pin and is engaged with the handwheel and the locking block respectively.

[0007] The aforementioned retracting rod includes a retracting rod head, a retracting rod fixing part, and a retracting rod threaded section located between the two. The threaded hole is formed on the outer opening of the double boss of the housing, and the inner opening of the double boss has a step for limiting the retracting rod head when the retracting rod retracts. The retracting rod fixing part is connected to the handwheel, and the retracting rod threaded section is threadedly engaged with the threaded hole. By providing a step for limiting the retracting rod's retraction, the completeness of gear meshing is improved.

[0008] The aforementioned clutch elastic element and clutch elastic element mounting base are respectively a clutch spring and a clutch spring seat. There are two clutch spring seats. One clutch spring seat is located in the support, which is fixedly connected to the wall panel. The other clutch spring seat is fitted onto the clutch shaft. The clutch spring abuts against one clutch spring seat and the other clutch spring seat respectively.

[0009] As a preferred embodiment, this utility model also includes two thrust ball bearings, one thrust ball bearing mounted on a clutch spring seat and the other thrust ball bearing mounted on another clutch spring seat, one end of the clutch spring abutting against a clutch spring seat and the other end contacting the other thrust ball bearing.

[0010] After installing the thrust ball bearing, the clutch spring can be prevented from twisting and the occurrence of offset phenomenon caused by twisting when the clutch shaft is rotating. This ensures that the preload of the clutch spring is constant, and ultimately guarantees the completion of the gear disengagement and engagement switching action and the stability of the preload clutch spring's corresponding compression deformation and frequent reset action.

[0011] The length of the aforementioned unlocking lever is such that its outer end just protrudes from the handwheel's limiting groove. This reasonable setting of the unlocking lever length achieves both convenient operation within easy reach and avoids easy detection, ensuring that it is not accidentally touched by unprofessional operators at the work site.

[0012] The aforementioned clutch shaft is a short shaft, and its length is shorter than that of the subsequent reduction gear shaft and the sprocket shaft.

[0013] The technical effect and innovative essence of the technical solution adopted by this utility model are as follows: When under load, this device ensures that the fast traction chain cannot be switched arbitrarily, i.e., it is in a self-locking state to guarantee the safety of the entire process of tensioning or lifting. When unloaded, it can also be unlocked to realize the gear disengagement and switching of the fast traction chain operation, thereby realizing the rapid return of the hook to the lifting position and shortening the operation preparation time. Among them, the first stage before the final reduction stage of the transmission connection realizes the switching between the reduction engagement and disengagement states of the gears. The clutch shaft is equipped with a small structure gear for switching. The clutch shaft and its parts can be designed to be short and lightweight, so the force for switching between engagement and disengagement is small.

[0014] In summary, this device can switch between self-locking chain travel, unlocking traction chain, and self-locking chain travel in sequence. Attached Figure Description

[0015] Figure 1 This is a front view of the self-locking part in this utility model;

[0016] Figure 2 yes Figure 1 Exploded view;

[0017] Figure 3 yes Figure 1 A cross-sectional view in one direction;

[0018] Figure 4 yes Figure 1 A cross-sectional view from another direction;

[0019] Figure 5 This is a schematic diagram of the structure of this utility model;

[0020] Figure 6 This is a partial schematic diagram of the meshing state;

[0021] Figure 7 This is a partial schematic diagram of the disengaged state. Detailed Implementation

[0022] Please see Figures 1-7As shown, a clutch-switching traction chain self-locking device for a tensioner or hoist includes a housing 1, a handwheel 2, a push-back lever 3, an unlocking lever 4, a locking block 5, and a clutch shaft 7, a rear reduction gear shaft 8, a sprocket shaft 9, a clutch elastic element, and at least one clutch elastic element mounting seat, which are sequentially moved and parallel to each other. The push-back lever 3 is fixed to the handwheel 2 and threadedly engaged with a screw hole (not shown) in the housing 1. One end 50 of the locking block 5 is elastically pivotally mounted on the handwheel 2, while the other end 51 is axially fixed to the unlocking lever 4 through the head of the unlocking lever and the retaining spring k2. The unlocking lever rests in the limiting groove 21 in the handwheel 2. The clutch shaft 7 is equipped with at least a clutch pinion 70. The rear reduction gear shaft 8 is equipped with a rear reduction gear 80 and a rear reduction gear pinion 81. The sprocket shaft 9 is equipped with a final reduction gear 90, a sprocket 91, and a chain 92 wound around the sprocket. The final reduction gear 90 is splinedly connected to the sprocket shaft 9. The rear reduction gear pinion 81 meshes with the final reduction gear 90. The push rod 3, clutch shaft 7, clutch elastic element, and clutch elastic element mounting seat are arranged coaxially. The clutch elastic element mounting seat is located on the wall plate B. The clutch elastic element abuts against the clutch shaft 7 and the clutch elastic element mounting seat respectively. The length of the unlocking rod 4 is such that its outer end, used as the operating end, just protrudes from the limiting groove 21 of the handwheel 2. See also Figure 1 The clutch is locked when the unlocking lever slides to the upper stop of the limit groove, and unlocked when the unlocking lever is pulled and located at the lower stop of the limit groove. The clutch shaft 7 is a short shaft, and its length is shorter than that of the rear reduction gear shaft 8 and the sprocket shaft 9.

[0023] The locking block and the cover are in a reversible state of contact and disengagement. Rotating the handwheel in one direction or pulling the unlocking lever while simultaneously rotating the handwheel in the other direction causes the clutch shaft to move axially reversibly. The clutch shaft pinion engages and disengages from the subsequent reduction gear reversibly. Specifically, when the push-back lever 3 is machined with a right-hand thread, one hand presses and pulls the unlocking lever 4 to disengage the locking block 5 from the cover 1. The other hand rotates the handwheel 2 clockwise, causing the push-back lever 3 to move the clutch shaft 7 forward under the force of the thread until the clutch shaft pinion 70 disengages from the subsequent reduction gear 80. Conversely, rotating the handwheel 2 counterclockwise allows the clutch shaft 7 to move axially backward using the combined force of the push-back lever 3's thread and the clutch's elastic element, until the clutch shaft pinion 70 engages with the subsequent reduction gear 80, and the locking block 5 resets and contacts the cover 1. A traction chain refers to a chain that moves rapidly under no-load conditions, while a running chain refers to a chain that reduces speed under load.

[0024] One end 50 of the locking block 5 is elastically pivotally mounted on the handwheel 2 via the locking block pin 6 and the torsion spring 61. Specifically, one end 50 of the locking block is fixed to the locking block pin 6 by means of the shaft retaining ring k1. The locking block pin 6 is threadedly connected to the handwheel 2. The torsion spring 61 is sleeved on the locking block pin 6 and is engaged with the handwheel 2 and the locking block 5 respectively.

[0025] The push rod 3 includes a push rod head 31, a push rod fixing part 32, and a push rod threaded section 30 located between the two. A threaded hole is formed on the outer opening of the double boss 10 of the cover 1. The inner opening of the double boss has a step 11 for limiting the push rod head 31 when the push rod 3 is retracted. The push rod fixing part 32 is connected to the handwheel 2. Specifically, the push rod fixing part 32 is inserted into the blind hole 22 of the boss of the handwheel 2 and fixed with a pin (not shown in conventional parts). The push rod threaded section 30 is threadedly engaged with the threaded hole. When the push rod 3 is assembled with the cover 1, the push rod 3 extends from the inside of the cover 1 to the outside of the cover through the threaded hole in a spiral manner under the threaded engagement. The rear diameter of the push rod head 31 is larger than the diameter of the push rod threaded section 30. The push rod head 31 is frustoconical and can be limited at the step 11. The push rod 3 corresponds to the outer end position of the clutch shaft 7.

[0026] Pull the unlock lever to disengage the locking block from the cover, and rotate the handwheel to advance the push-back lever until the handwheel contacts the cover, disengaging the clutch pinion from the rear reduction gear; rotate the handwheel to retract the push-back lever until the push-back lever is axially limited within the cover, the locking block returns to its original position and contacts the cover, and the clutch pinion engages with the rear reduction gear.

[0027] The clutch elastic element and the clutch elastic element mounting base are respectively the clutch spring and the clutch spring seat. There are two clutch spring seats. One clutch spring seat 74I is located in the support 75, and the support 75 is fixedly connected to the wall plate B. The other clutch spring seat 74T is sleeved on the clutch shaft 7. The clutch spring 73 abuts against one clutch spring seat and the other clutch spring seat respectively.

[0028] As a preferred feature, this utility model also includes two thrust ball bearings, one thrust ball bearing F1 is mounted on a clutch spring seat 74I and the other thrust ball bearing F2 is mounted on another clutch spring seat 74T, one end of the clutch spring 73 abuts against a clutch spring seat 74I and the other end of the clutch spring 73 contacts the other thrust ball bearing F2.

[0029] The clutch shaft 7 is also provided with a clutch shaft spline portion 71, which is circumferentially fixed and axially slidingly fitted in the sliding gear 72. The rotation of the clutch shaft 7 is transmitted through a front-stage conventional transmission chain (not shown) that meshes with the sliding gear 72.

[0030] exist Figure 6 When the small gear 70 of the clutch shaft is engaged with the subsequent reduction gear 80, the chain can be reduced in speed. Figure 7 When the small gear 70 of the clutch shaft and the subsequent reduction gear 80 are in a disengaged state, the chain can be pulled quickly.

Claims

1. A clutch-switching self-locking device for traction chain travel in a tensioner or hoist, characterized in that: It includes a housing, handwheel, push-back lever, locking block, unlocking lever, and a clutch shaft, a rear reduction gear shaft, a sprocket shaft, a clutch elastic element, and at least one clutch elastic element mounting base, wherein, The push-back lever is fixed to the handwheel and threaded into a screw hole in the cover. One end of the locking block is elastically pivoted on the handwheel, while the other end is axially fixed to the unlocking lever. The unlocking lever rests in a limiting groove in the handwheel. The clutch shaft is equipped with at least a clutch shaft pinion; the rear reduction gear shaft is equipped with a rear reduction gear and a rear reduction gear shaft pinion; and the sprocket shaft is equipped with a spline-connected final reduction gear, a sprocket, and a chain wound around the sprocket. The push rod, clutch shaft, clutch elastic element and clutch elastic element mounting seat are arranged coaxially. The clutch elastic element mounting seat is set on the wall panel, and the clutch elastic element abuts against the clutch shaft and clutch elastic element mounting seat respectively.

2. The clutch switching traction chain self-locking device for a tensioner or hoist according to claim 1, characterized in that: One end of the locking block is elastically pivotally mounted on the handwheel via a torsion spring and a locking block pin. Specifically, one end of the locking block is axially fixed to the locking block pin, and the locking block pin is fixedly connected to the handwheel. The torsion spring is sleeved on the locking block pin and is engaged with the handwheel and the locking block respectively.

3. The clutch-switching traction chain self-locking device for a tensioner or hoist according to claim 1 or 2, characterized in that: The push rod includes a push rod head, a push rod fixing part, and a push rod threaded section located between the two. The threaded hole is formed on the outer opening of the double boss of the cover. The inner opening of the double boss has a step for limiting the push rod head when the push rod is retracted. The push rod fixing part is connected to the handwheel. The push rod threaded section is threadedly engaged with the threaded hole.

4. The clutch switching traction chain self-locking device for a tensioner or hoist according to claim 1, characterized in that: The clutch elastic element and the clutch elastic element mounting base are respectively a clutch spring and a clutch spring seat. There are two clutch spring seats. One clutch spring seat is located in the support, and the support is fixedly connected to the wall panel. The other clutch spring seat is sleeved on the clutch shaft. The clutch spring abuts against one clutch spring seat and the other clutch spring seat respectively.

5. The clutch switching traction chain self-locking device for a tensioner or hoist according to claim 4, characterized in that: It also includes two thrust ball bearings, one of which is mounted on a clutch spring seat and the other is mounted on a clutch spring seat. One end of the clutch spring abuts against a clutch spring seat and the other end contacts the other thrust ball bearing.

6. The clutch-switching traction chain self-locking device for a tensioner or hoist according to claim 1, characterized in that: The length of the unlocking lever is such that its outer end just protrudes from the handwheel's limiting groove.

7. The clutch-switching traction chain self-locking device for a tensioner or hoist according to claim 1, characterized in that: The clutch shaft is a short shaft, and its length is shorter than that of the subsequent reduction gear shaft and the sprocket shaft.

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