CN108689323B

CN108689323B - No-load lever block

Info

Publication number: CN108689323B
Application number: CN201810892448.7A
Authority: CN
Inventors: 曾剑
Original assignee: Chongqing Toho Rongkee Electronic And Machinery Co ltd
Current assignee: Chongqing Toho Rongkee Electronic And Machinery Co ltd
Priority date: 2018-08-07
Filing date: 2018-08-07
Publication date: 2024-01-23
Anticipated expiration: 2038-08-07
Also published as: CN108689323A

Abstract

The invention particularly discloses a no-load lever block which comprises an upper lifting hook, wherein a gear cover and a ratchet cover are fixed below the upper lifting hook, a long shaft is fixed between the gear cover and the ratchet cover, a gear transmission system, a wallboard I, a chain wheel, a wallboard II, a brake seat, a friction plate I, a ratchet wheel, a friction plate II, a load limiter seat, a reversing ratchet wheel, a handle and a lock nut are sequentially arranged on the long shaft from left to right, a pin shaft is fixed on the wallboard II, a torsion spring and a pawl II are sleeved on the pin shaft, the outer edge of the brake seat comprises braking teeth which are uniformly distributed and matched with the pawl II, a sliding switch is arranged on the ratchet cover, and the switch comprises a stirring part arranged outside the ratchet cover and a contact part arranged in the ratchet cover. The invention provides an unloaded lifting lever block which is convenient to operate, not only can realize lifting of a chain in an unloaded or light-load state, but also can realize lifting of the chain when a heavy object and an empty zipper are lifted, and the application range of the lever block is enlarged.

Description

No-load lever block

Technical Field

The invention relates to the field of hoisting equipment, in particular to a lever block.

Background

The hoist is used as a small lifting mechanical device which is simple to use and convenient to carry and is widely applied, lifting of the hoist is realized by shaking a handle by utilizing a lever action principle, reversing pawls on the handle act on reversing ratchet wheels to enable the reversing ratchet wheels to rotate, and the reversing ratchet wheels rotate to drive chain wheels to rotate.

There is a model HSH-VP616-0.8T lever block on the market, above-mentioned lever block includes the lifting hook, be fixed with gear cover and ratchet cover below the lifting hook, be fixed with the major axis between gear cover and the ratchet cover, gear drive system is set gradually from left to right on the major axis, wallboard I, the sprocket, wallboard II, the stopper seat, friction disc I, the ratchet, friction disc II, the switching-over ratchet, handle and lock nut, around having its assorted chain on the sprocket, the chain below is fixed with down the lifting hook, friction disc I, ratchet and friction disc II cover are established on the stopper seat, be fixed with pawl I on the wallboard II, pawl I blocks the ratchet, switching-over ratchet below is provided with the switching-over pawl, the switching-over pawl is fixed on the handle. Although the hoist can hoist heavy objects, for special industries such as power industries needing to erect and tension cables at high altitude, the weight of a traction rope is very light before the cables are tensioned, and operators cannot tighten the cables if the lever hoist is used. Because of the reason of hoist working position and for manual operation convenience, the handle often needs to drive the sprocket to rotate through reciprocating rotation, and under the condition that the lower lifting hook does not hang a heavy object or the hanging heavy object is too light, when the handle is rotated, the sprocket can rotate along with the handle due to insufficient heavy object reaction force, and finally the chain can ascend and descend along with the reciprocating rotation of the handle, so that the lever hoist can not effectively lift when in no load.

The invention of a piece name of no-load lever block is disclosed in CN201420476145.4, and comprises a machine shell, wherein a long shaft is arranged in the machine shell, a brake seat, a ratchet wheel, a reversing ratchet wheel, a cam, a hand wheel and a torsion spring seat are sleeved in sequence from inside to outside on the long shaft, a first torsion spring is arranged between the torsion spring seat and the hand wheel to compress the hand wheel, a second torsion spring is arranged between the hand wheel and the reversing ratchet wheel to compress the reversing ratchet wheel, the first torsion spring is a anticlockwise torsion spring, the second torsion spring is a clockwise torsion spring, and the torsion force of the first torsion spring is larger than that of the second torsion spring; the shell is also internally provided with a mounting plate, the mounting plate is provided with a first pawl and a second pawl, and the first pawl and the second pawl are symmetrically arranged relative to the central line of the ratchet wheel. The above patent can realize the unloading and lifting, but the hand wheel is required to be pulled out in the unloading state, and the hand wheel is required to be pressed in the lifting state, and the actions of pulling out the hand wheel and pressing the hand wheel are required to be completed in the air, so that the problem of inconvenient operation exists.

The utility model discloses a take lever block structure of limit for load in CN201720088167.7, including long axis and hoisting sprocket, stopper seat, ratchet, limit for load ware seat, switching-over ratchet, the setting of switching-over ratchet below set gradually on the long axis, the ratchet cover is on the stopper seat, switching-over ratchet cover is on the limit for load ware seat, its characterized in that: the reversing pawl comprises an ascending working end, a descending working end and a small torsion spring, wherein the descending working end is arranged on the shifting block shaft, the ascending working end is hinged with the descending working end through a hinge part and connected with the descending working end through the small torsion spring, the outer edge of the ascending working end is provided with a clamping part, the ascending working end rotates around the hinge part to be separated from or closed with the descending working end, and the lower end of the reversing pawl is in contact with the ejector rod spring. The structure disclosed in the patent can realize the load limiting function of the lever block, but cannot realize the no-load lifting function of the lever block.

Disclosure of Invention

The invention aims to provide the non-load lever block which is convenient to operate, not only can realize lifting of the chain in a non-load or light-load state, but also can realize lifting of the chain when lifting heavy objects and empty zipper chains, and the application range of the lever block is enlarged.

The invention is realized through the following technical scheme that the no-load lever block comprises an upper lifting hook, a gear cover and a ratchet cover are fixed below the upper lifting hook, a long shaft is fixed between the gear cover and the ratchet cover, a gear transmission system, a wallboard I, a chain wheel, a wallboard II, a brake seat, a friction plate I, a ratchet wheel, a friction plate II, a load limiter seat, a reversing ratchet wheel, a handle and a lock nut are sequentially arranged on the long shaft from left to right, a chain matched with the chain is wound on the chain wheel, a lower lifting hook is fixed below the chain, the friction plate I, the ratchet wheel and the friction plate II are sleeved on the brake seat, a pawl I is fixed on the wallboard II, the pawl I clamps the ratchet wheel, a reversing pawl is arranged below the reversing ratchet wheel, the reversing pawl is fixed on the handle, a pin is fixed on the wallboard II, a torsion spring and the pawl II are sleeved on the pin, the outer edge of the brake seat comprises brake teeth which are uniformly distributed and are matched with the pawl II, and a sliding switch is arranged on the ratchet cover, and comprises a poking part arranged outside the ratchet cover and a contact part arranged in the ratchet cover.

The working principle of the scheme is as follows: when the poking part of the poking sliding switch enables the contact part of the sliding switch not to be in extrusion contact with the pawl II, the pawl II clamps the braking teeth on the brake seat under the action of the torsion spring, and the lever block is in a no-load lifting function state. When the hoist lower lifting hook is unloaded or lightly loaded, the handle is pulled clockwise, the reversing ratchet wheel rotates to press the friction plate II, the ratchet wheel, the friction plate I and the brake seat, the brake seat rotates to drive the long shaft to rotate clockwise, and the long shaft rotates clockwise to drive the chain wheel to rotate through the gear transmission system, so that the chain rises; when the handle is rotated, the reversing ratchet wheel has a tendency of driving the long shaft to rotate anticlockwise under the action of the lock nut, but the long shaft is not rotated and the chain is not lowered because the friction resistance between the brake seat and the pawl II is larger than the friction force of the reversing pawl on the reversing ratchet wheel, so that the brake seat cannot rotate, and the chain does not vertically ascend and descend along with the reciprocating rotation of the handle. When the lifting hook lifts a heavy object, the handle is pulled clockwise, the reversing ratchet wheel rotates to press the friction plate II, the ratchet wheel, the friction plate I and the brake seat, the brake seat rotates to drive the long shaft to rotate clockwise, and the long shaft rotates clockwise to drive the chain wheel to rotate through the gear transmission system to enable the chain to lift the heavy object; when the handle is rotated, the brake seat, the friction plate I, the ratchet wheel, the friction plate II and the reversing ratchet wheel are mutually pressed by the reaction force of the heavy object, wherein the ratchet wheel cannot rotate under the action of the pawl I, so that the long shaft cannot rotate, the chain wheel cannot rotate, and the chain cannot descend.

When the poking part of the poking sliding switch enables the contact part of the sliding switch to be in extrusion contact with the pawl II, the pawl II is separated from the braking teeth on the brake seat, the brake seat is not influenced by the pawl II, the brake seat can rotate clockwise and anticlockwise, and the lever block is in a closed no-load lifting function state. At the moment, when the hoist lower lifting hook is unloaded or lightly loaded, the handle is pulled clockwise, the reversing ratchet wheel rotates and compresses the friction plate II, the ratchet wheel, the friction plate I and the brake seat, the brake seat rotates to drive the long shaft to rotate clockwise, and the long shaft rotates clockwise and then drives the chain wheel to rotate through the gear transmission system, so that the chain rises; when the handle is turned, the reversing ratchet wheel drives the long shaft to turn under the action of the locking nut, and the long shaft turns to enable the chain wheel to turn through the gear transmission system, so that the chain descends. The hoist is closed and no-load lifting function is achieved, and when the lower lifting hook is in no-load or light-load, the chain cannot be effectively lifted. When a weight is lifted by the hoist lower lifting hook, the handle is pulled clockwise, the reversing ratchet wheel rotates to press the friction plate II, the ratchet wheel, the friction plate I and the brake seat, the brake seat rotates to drive the long shaft to rotate clockwise, and the long shaft rotates clockwise to drive the chain wheel to rotate through the gear transmission system, so that the chain rises to lift the weight; when the handle is rotated, the brake seat, the friction plate I, the ratchet wheel, the friction plate II and the reversing ratchet wheel are mutually pressed by the reaction force of the heavy object, wherein the ratchet wheel cannot rotate under the action of the pawl I, so that the long shaft cannot rotate, the chain wheel cannot rotate, and the chain cannot descend.

The application principle of the scheme is as follows: when the sliding switch poking part is poked to enable the contact part not to be in extrusion contact with the pawl II, and the no-load lifting function is started, the pawl II clamps the braking teeth on the brake seat under the action of the torsion spring, and the handle is poked clockwise under the condition that the lower lifting hook is not loaded or lightly loaded, so that the chain rises, the handle is turned around, and the chain does not rise or fall; under the condition that the lower lifting hook lifts the weight, the handle is pulled clockwise, the chain ascends, the handle is rotated, and the chain does not ascend or descend. The sliding switch poking part is poked to enable the contact part to be in extrusion contact with the pawl II, the pawl II is separated from the braking teeth on the brake seat, when the no-load lifting function is closed, the handle is poked clockwise under the condition that the lower lifting hook is not loaded or is lightly loaded, the chain is lifted, the handle is turned back, and the chain is lowered; under the condition that the lower lifting hook lifts the weight, the handle is pulled clockwise, the chain ascends, the handle is rotated, and the chain does not ascend or descend. When the functions are realized, the reversing pawl clamps the reversing ratchet wheel, when the reversing pawl is disconnected with the reversing ratchet wheel, the handle idles, and at the moment, the chain can be lifted or lowered by the empty zipper.

The beneficial effect of this scheme lies in: 1. the chain lifting device is convenient to operate, and not only can realize chain lifting under the condition of no load or light load, but also can realize chain lifting during lifting of heavy objects and empty zipper chains.

2. The symmetrical position of the wall plate II with the long axis as the center is provided with two pawls I, so that the pawls I clamp the ratchet wheel to rotate in one direction only, and compared with the wall plate II provided with only one pawl I, the braking force of the ratchet wheel during braking is larger and more uniform.

3. In the invention, the effect of the rotating connection of the ratchet cover and the handle is that the protection of the parts between the wallboard II and the handle by the ratchet cover is not affected under the condition that the handle can rotate.

4. In the invention, when the lock nut compresses the brake seat, the friction plate I, the ratchet wheel, the friction plate II, the reversing ratchet wheel and the handle, the reversing ratchet wheel is provided with the groove, and the friction force transmission between the reversing ratchet wheel and the friction plate II is more beneficial to the friction force transmission between the reversing ratchet wheel and the friction plate II compared with the friction force transmission without the groove on the reversing ratchet wheel due to the matching of the friction plate II and the groove

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the no-load lever block of the present invention.

Fig. 2 is a schematic diagram of a wallboard II and a right side explosion of the wallboard II according to an embodiment of the unloaded lever block of the present invention.

Fig. 3 is a schematic view partially in section with an unloading lifting function according to an embodiment of the invention.

Fig. 4 is a schematic view partially in section without the load lifting function of an embodiment of the present invention.

In the figure: 1. upper hook, 21 gear cover, 22 ratchet cover, 221 through hole, 222 groove I, 3 long shaft, 30 wallboard I, 31 sprocket, 311 chain, 312 lower hook, 32 wallboard II, 321 pawl I, 322 pin, 323 torsion spring, 324 pawl II, 33 brake seat, 331 brake tooth, 34 friction plate I, 35 ratchet, 36 friction plate II, 37 load limiter seat, 38 reversing ratchet, 39 handle, 391 inner handle, 392 outer handle, 393 reversing pawl, 40 lock nut, 5 sliding switch, 51 toggle part, 52 contact part.

Detailed Description

The following will describe in detail specific embodiments with reference to the accompanying drawings.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the no-load lever block comprises an upper lifting hook 1, a gear cover 21 and a ratchet cover 22 are fixed below the upper lifting hook 1, a long shaft 3 is fixed between the gear cover 21 and the ratchet cover 22, a gear transmission system, a wallboard I30, a chain wheel 31, a wallboard II32, a brake seat 33, a friction plate I34, a ratchet 35, a friction plate II36, a load limiter seat 37, a reversing ratchet 38, a handle 39 and a locking nut 40 are sequentially arranged on the long shaft 3 from left to right, a chain 311 matched with the chain is wound on the chain wheel 31, a lower lifting hook 312 is fixed below the chain 311, the friction plate I34, the ratchet 35 and the friction plate II36 are sleeved on the brake seat 33, a pawl I321 is fixed on the wallboard II32, the pawl I321 clamps the ratchet 35, a reversing pawl 393 is arranged below the reversing ratchet 38, a pin 322 is fixed on the wallboard II32, torsion springs 323 and II324 are sleeved on the pin 322, the outer edge of the brake seat 33 comprises a ratchet cover 22 which is uniformly distributed and matched with the ratchet cover 22, and is arranged at the outer side of the ratchet seat 22, and the ratchet seat 22 is contacted with the ratchet cover 5, and the ratchet cover is arranged at the outer side of the ratchet cover 52, and the sliding part is contacted with the ratchet cover 52, and the sliding part is arranged at the sliding part 52.

The working principle of the scheme is as follows: when the poking part 51 of the sliding switch 5 is poked to make the contact part 52 of the sliding switch 5 not be in extrusion contact with the pawl II324, the pawl II324 clamps the braking teeth 331 on the brake base 33 under the action of the torsion spring 323, and at this time, the lever block is in a state with no-load lifting function. When the hoist lower lifting hook 312 is not loaded or lightly loaded, the handle 39 is pulled clockwise, the reversing ratchet wheel 38 rotates to press the friction plate II36, the ratchet wheel 35, the friction plate I34 and the brake seat 33, the brake seat 33 rotates to drive the long shaft 3 to rotate clockwise, and the long shaft 3 rotates clockwise and then drives the chain wheel 31 to rotate through the gear transmission system, so that the chain 311 rises; when the handle 39 is turned, the reversing ratchet 38 has a tendency to drive the long shaft 3 to rotate anticlockwise under the action of the lock nut 40, but the long shaft 3 cannot rotate and the chain 311 does not descend because the friction resistance between the brake seat 33 and the pawl II324 is larger than the friction force of the reversing pawl 393 to the reversing ratchet 38, so that the brake seat 33 cannot rotate, and the chain 311 does not ascend and descend along with the reciprocating rotation of the handle 39. When the hoist lower lifting hook 312 lifts a heavy object, the handle 39 is pulled clockwise, the reversing ratchet 38 rotates to press the friction plate II36, the ratchet 35, the friction plate I34 and the brake seat 33, the brake seat 33 rotates to drive the long shaft 3 to rotate clockwise, and the long shaft 3 rotates clockwise to drive the chain wheel 31 to rotate through the gear transmission system to enable the chain 311 to rise, so that the heavy object is lifted; when the handle 39 is turned, the brake holder 33, the friction plate I34, the ratchet 35, the friction plate II36 and the reversing ratchet 38 are pressed against each other by the reaction force of the weight, wherein the ratchet 35 cannot be turned under the action of the pawl I321, so that the long shaft 3 cannot be turned, the sprocket 31 cannot be turned, and the chain 311 does not descend.

When the poking part 51 of the poking slide switch 5 enables the contact part 52 of the slide switch 5 to be in extrusion contact with the pawl II324, the pawl II324 is separated from the brake teeth 331 on the brake base 33, the brake base 33 is not influenced by the pawl II324, and can rotate clockwise and anticlockwise, and the lever block is in a state of closing the no-load lifting function. At this time, when the hoist lower hook 312 is unloaded or lightly loaded, the handle 39 is pulled clockwise, the reversing ratchet 38 rotates and compresses the friction plate II36, the ratchet 35, the friction plate I34 and the brake seat 33, the brake seat 33 rotates to drive the long shaft 3 to rotate clockwise, and the long shaft 3 rotates clockwise to drive the sprocket 31 to rotate through the gear transmission system, so that the chain 311 rises; when the handle 39 is turned, the reversing ratchet 38 drives the long shaft 3 to turn under the action of the lock nut 40, and the long shaft 3 turns to rotate the sprocket 31 through the gear transmission system, so that the chain 311 descends. The hoist closes the no-load lifting function, and the chain 311 cannot be effectively lifted when the lower lifting hook 312 is no-load or light-load. When the hoist lower lifting hook 312 lifts a heavy object, the handle 39 is pulled clockwise, the reversing ratchet 38 rotates to press the friction plate II36, the ratchet 35, the friction plate I34 and the brake seat 33, the brake seat 33 rotates to drive the long shaft 3 to rotate clockwise, and the long shaft 3 rotates clockwise to drive the chain wheel 31 to rotate through the gear transmission system, so that the chain 311 ascends to lift the heavy object; when the handle 39 is turned, the brake base 33, the friction plate I34, the ratchet wheel 35, the friction plate II36 and the reversing ratchet 38 are mutually pressed by the reaction force of the heavy object, wherein the ratchet wheel 35 cannot be turned under the action of the pawl I321, so that the long shaft 3 cannot be turned, the chain wheel 31 cannot be turned, and the chain 311 cannot be lowered.

The application principle of the scheme is as follows: when the sliding switch 5 is shifted to enable the contact part 52 not to be in extrusion contact with the pawl II324 and the no-load lifting function is started, the pawl II324 clamps the braking teeth 331 on the brake seat 33 under the action of the torsion spring 323, the handle 39 is pulled clockwise under the condition that the lower lifting hook 312 is not loaded or lightly loaded, the chain 311 rises, the handle 39 is rotated, and the chain 311 does not rise or fall; when the lower hook 312 lifts a weight, the handle 39 is pulled clockwise, the chain 311 is lifted, the handle 39 is turned around, and the chain 311 is not lifted or lowered. The poking part 51 of the poking slide switch 5 is poked to enable the contact part 52 to be in extrusion contact with the pawl II324, the pawl II324 is separated from the braking teeth 331 on the brake seat 33, when the no-load lifting function is closed, the handle 39 is poked clockwise under the condition that the lower lifting hook 312 is no-load or light-load, the chain 311 rises, the handle 39 is rotated, and the chain 311 descends; when the lower hook 312 lifts a weight, the handle 39 is pulled clockwise, the chain 311 is lifted, the handle 39 is turned around, and the chain 311 is not lifted or lowered. The reversing pawl 393 catches the reversing ratchet 38 when the reversing pawl 393 is disengaged from the reversing ratchet 38, and the handle 39 idles, at which time the chain 311 can be raised or lowered by the empty zipper 311.

The beneficial effect of this scheme lies in: the chain 311 lifting device is convenient to operate, and not only can realize lifting of the chain 311 in an unloaded or light load state, but also can realize lifting of the chain 311 when lifting a heavy object and an empty zipper 311.

Further, the pawl I321 includes two pawls, which are respectively disposed at symmetrical positions centered on the long axis 3. The symmetrical position of the two pawls I321 on the wall plate II32 centering around the long axis 3 has the effect that the pawls I321 catch the ratchet 35 to rotate only in one direction, and the braking force of the ratchet 35 when braking is larger and more uniform than the braking force of only one pawl I321 on the wall plate II 32.

Further, the handle 39 comprises an inner handle 391 and an outer handle 392 which are fixedly connected, the ratchet cover 22 is fixed on the wall plate II32, the ratchet cover 22 is provided with a through hole 221, the edge of the through hole 221 comprises a groove I222 protruding rightwards, the inner handle 391 is arranged in the groove I222, and the handle 39 is connected in a rotating way around the ratchet cover 22. The effect of the pivotal connection of the handle 39 about the ratchet housing 22 is that the handle 39 is rotatable without affecting the protection of the ratchet housing 22 from the components between the wall plate II32 and the handle 39.

Further, the left side of the load limiter seat 37 includes a groove, and the friction plate II36 is matched with the groove. When the lock nut 40 compresses the brake base 33, the friction plate I34, the ratchet 35, the friction plate II36, the load limiter base 37, the reversing ratchet 38 and the handle 39, the load limiter base 37 is provided with a groove, and the friction plate II36 and the groove are matched to be more beneficial to the transmission of friction force between the load limiter base 37 and the friction plate II36 compared with the case that the load limiter base 37 is not provided with the groove.

Claims

1. The utility model provides a no-load lever block, including last lifting hook (1), go up lifting hook (1) below and be fixed with gear cover (21) and ratchet cover (22), be fixed with major axis (3) between gear cover (21) and the ratchet cover (22), gear drive system has been set gradually from left to right on major axis (3), wallboard I (30), sprocket (31), wallboard II (32), stopper seat (33), friction disc I (34), ratchet (35), friction disc II (36), load limiter seat (37), switching-over ratchet (38), handle (39) and lock nut (40), around being equipped with chain (311) with it on sprocket (31), chain (311) below is fixed with down lifting hook (312), friction disc I (34), ratchet (35) and friction disc II (36) cover are established on stopper seat (33), be fixed with pawl I (321) on wallboard II (32), pawl I (321) blocks ratchet (35), switching-over ratchet (38) below is provided with switching-over pawl (393), pawl (393) are fixed on pawl (39), its characterized in that switching-over pawl (393): be fixed with round pin axle (322) on wallboard II (32), the cover is equipped with torsional spring (323) and pawl II (324) on round pin axle (322), and stopper seat (33) outer fringe is including evenly distributed and with pawl II (324) matched with braking tooth (331), is provided with slide switch (5) on ratchet cover (22), and slide switch (5) are including setting up stirring portion (51) outside ratchet cover (22) and setting up contact portion (52) in ratchet cover (22).

2. The no-load lever block of claim 1, wherein: the pawl I (321) comprises two pawls which are respectively arranged at symmetrical positions with the long shaft (3) as the center.

3. The no-load lever block of claim 1 or 2, wherein: the handle (39) comprises an inner handle (391) and an outer handle (392) which are fixedly connected, the ratchet cover (22) is fixed on the wallboard II (32), the ratchet cover (22) is provided with a through hole (221), the edge of the through hole (221) comprises a groove I (222) protruding rightwards, the inner handle (391) is arranged in the groove I (222), and the handle (39) is connected in a rotating way around the ratchet cover (22).

4. The no-load lever block of claim 1 or 2, wherein: the left side of the load limiter seat (37) comprises a groove, and the friction plate II (36) is matched with the groove.

5. The no-load lever block of claim 3, wherein: the left side of the load limiter seat (37) comprises a groove, and the friction plate II (36) is matched with the groove.