CN210764063U - Hoist block and load limiting device thereof - Google Patents

Abstract

The utility model discloses a hoist block and limit for tonnage device thereof relates to hoisting equipment technical field, and the hoist block includes casing, reduction gears, elevating system, and reduction gears includes transmission shaft, sun gear, two at least planetary gear, ring gear and planet carrier, and the ring gear both sides all are equipped with the friction disc, and the ring gear contacts towards the friction disc of one side of power supply and the inner wall of casing. The load limiting device comprises an adjusting block, an elastic part and a load limiting ring, the adjusting block is fixed relative to the shell, the elastic part and the load limiting ring are located between the adjusting block and the gear ring, a cylindrical groove and a circular groove are formed in the side face, facing the gear ring, of the adjusting block, through holes are formed in the elastic part and the load limiting ring, the load limiting ring can stretch into the circular groove, the load limiting ring is pressed on a friction piece on the side face of the gear ring under the elastic action, the end portion of a transmission shaft sequentially stretches into the cylindrical groove through the load limiting ring and a spring plate, and therefore the load limiting device is arranged, the motor and the gear are prevented from being damaged by overload, and safety accidents are avoided.

Description

Hoist block and load limiting device thereof

Technical Field

The utility model relates to an explosion-proof hoisting equipment technical field, more specifically say, relate to a hoist block and limit for tonnage device thereof.

Background

The ring chain pneumatic hoist is the most ideal explosion-proof hoisting equipment in the world and is mainly applied to space hoisting operation containing inflammable and explosive gas and dust.

The pneumatic hoist in the prior art does not have the overload protection function, the pneumatic hoist is easy to lift or descend heavy objects in an overload state, if the overload condition is light, a pneumatic motor or a gear is damaged, and if the overload condition is serious, the whole device can cause serious safety accidents.

Therefore, how to solve the problem that the motor and the gear are easy to damage and the safety accident is easy to cause in the overload state of the hoist block in the prior art becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a jack-up hoist and load limiting device thereof easily damage motor and gear, easily cause the technical problem of incident under the overload state in order to solve among the prior art jack-up hoist existence. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

The utility model provides a load limiting device of hoist block, wherein, the hoist block includes:

a housing;

the speed reducing mechanism is arranged in the shell and comprises a transmission shaft connected with a power source of the hoist block, a sun gear sleeved on the transmission shaft, at least two planetary gears meshed with the sun gear, a gear ring meshed with each planetary gear and a planet carrier sleeved on the transmission shaft and rotatably connected with shafts of the planetary gears, wherein the gear ring is consistent with a central shaft of the sun gear;

the lifting mechanism comprises a hoisting chain wheel connected with the planet carrier, a hoisting chain arranged on the hoisting chain wheel and a lifting hook arranged at the lower end of the hoisting chain and used for hoisting a heavy object;

it is characterized by comprising:

friction plates are arranged on two sides of the gear ring, and the friction plates on one side of the gear ring facing the power source are in contact with the inner wall of the shell; the load limiting device is arranged on one side of the gear ring, which is far away from the power source, and comprises an adjusting block fixed relative to the shell, an elastic part and a load limiting ring, wherein the elastic part and the load limiting ring are positioned between the adjusting block and the gear ring, the side of the adjusting block, which faces the gear ring, is provided with a groove and an annular bulge arranged in the groove so as to divide the groove into a cylindrical groove and an annular groove, which are used for the end part of the transmission shaft to stretch into, the cylindrical groove and the annular groove are coaxial, the elastic part is provided with a first through hole for the annular bulge to stretch into so as to enable the elastic part to stretch into the annular groove, the load limiting ring is provided with a second through hole for the elastic part to stretch into, the load limiting ring can stretch into the annular groove so as to press the elastic part in the annular groove, and the load limiting ring is pressed on the friction sheet on the side of the gear ring under the elastic action of the elastic part, the end part of the transmission shaft sequentially passes through the load limiting ring and the elastic part and extends into the cylindrical groove.

Preferably, the adjusting block, the elastic element and the load limiting ring are coaxial, and the section perpendicular to the transmission shaft is circular.

Preferably, the friction plates on two sides of the gear ring are both in an annular structure and are coaxial with the gear ring.

Preferably, be equipped with in the ring channel and run through the third through-hole of regulating block, through the fastener by the regulating block deviates from one side of elastic component passes the third through-hole, the tip of fastener can push up on the elastic component, through adjusting the elasticity degree of fastener can be adjusted the size of the limit for load power of ring gear.

Preferably, the elastic part is two butterfly springs which are arranged in a superposed mode, a limited carrier plate is arranged between the adjusting block and the butterfly springs, the limited carrier plate is sleeved on the transmission shaft, the plane where the limited carrier plate is located is perpendicular to the transmission shaft, and the fastening piece abuts against the limited carrier plate.

Preferably, a nylon plug is arranged in the cylindrical groove of the adjusting block to separate the transmission shaft and the adjusting block, a fourth through hole is formed in the nylon plug in the axial direction, and the end of the transmission shaft extends into the fourth through hole.

The utility model also provides a hoist, limit for tonnage device in above-mentioned embodiment.

Preferably, the power source is a pneumatic motor, the pneumatic motor comprises a cylinder housing fixed relative to the housing, an output shaft arranged in the cylinder housing, and a rotor sleeved on the output shaft, the output shaft is connected with the transmission shaft, fan blades are arranged on the periphery of the rotor, the cylinder housing comprises a housing body, a front cover and an end cover arranged at two ends of the housing body, a moving block is arranged between the rotor and the end cover, the moving block is sleeved on the output shaft, a spring is arranged on the side surface of the moving block facing the end cover, brake pads are arranged on the side surfaces of the front cover and the moving block facing the rotor, when air flow enters the cylinder housing, the moving block moves along the direction of the output shaft to the end cover under the action of the air flow, the rotor is separated from the two brake pads, and the rotor rotates, the spring is in contact with the end cover and elastically deforms; when no air flow exists in the air cylinder, the spring restores elastic deformation, two ends of the rotor are respectively contacted with the two brake pads to generate braking, and the rotor stops rotating.

Preferably, the housing includes a rear cover disposed at one side of the adjusting block, and an exhaust net is disposed on the rear cover to exhaust the exhaust gas generated by the pneumatic motor.

Preferably, the hoisting sprocket is provided with a cross chain guide slot for the hoisting chain to extend into so as to prevent the hoisting chain from rotating relative to the hoisting sprocket.

The utility model provides an among the technical scheme, the hoist comprises a housin, reduction gears, elevating system, reduction gears sets up in the casing, reduction gears includes the transmission shaft, the sun gear, two at least planetary gear, ring gear and planet carrier, the transmission shaft is connected with the power supply of hoist, the sun gear cover is established on the transmission shaft, each planetary gear meshes with the sun gear mutually, ring gear and each planetary gear homogeneous phase meshing, the planet carrier cover is established on the transmission shaft, and all can rotate with each planetary gear's axle and be connected, the ring gear is mutually unanimous with the central axis of sun gear, and the both sides of ring gear all are equipped with the friction disc, the ring gear contacts towards the inner wall of one side of power supply and casing, the jack-up sprocket is connected with the planet carrier again, the jack-up chain sets up on the jack-up sprocket, a. So set up, when pneumatic motor drive transmission shaft rotated, the ring gear was fixed relatively to the casing, and each planetary gear revolves around the sun gear, realizes slowing down, and the revolution of planet wheel output power makes planet carrier and lifting sprocket rotate. The load limiting device comprises an adjusting block, an elastic part and a load limiting ring, the adjusting block is fixed relative to the shell, the elastic part and the load limiting ring are positioned between the adjusting block and the gear ring, the side surface of the adjusting block facing the gear ring is provided with a groove and an annular bulge arranged in the groove, the groove is divided into a cylindrical groove and an annular groove by the annular bulge, the cylindrical groove and the annular groove are coaxial, the elastic part is provided with a first through hole for the annular bulge to extend into, so that the elastic part extends into the annular groove, the load limiting ring is provided with a second through hole for the elastic part to extend into, the load limiting ring can extend into the annular groove, so that the elastic part is pressed in the annular groove, the load limiting ring is pressed on a friction sheet on the side surface of the gear ring under the elastic action of the elastic part, the end part of the transmission shaft sequentially passes through the load limiting ring and the elastic part and extends into the cylindrical groove, thus, the gear ring is kept, and the friction force of the gear ring depends on the elastic force of the elastic part. When the hoisting block is not overloaded, the friction force borne by the gear ring is smaller than the maximum friction force borne by the gear ring, namely when the hoisting block works normally, the power source drives the transmission shaft and the sun gear to rotate, the plurality of planetary gears meshed with the sun gear revolve with the sun gear, the gear ring is kept still, and the planetary gears revolve to drive the planet carrier to rotate so as to drive the hoisting chain wheel to rotate; during overload, the load of ring gear is greater than the frictional force that the ring gear received, the frictional force that the ring gear received is not enough to support the ring gear stationary, the ring gear will skid and begin to rotate, planetary gear is around the axis rotation in the original position of self, planetary gear does not have the power take off of revolution, can not drive the planet carrier rotation, lead to hoisting sprocket can not rotate, the heavy object original position that the lifting hook promoted stops, just so avoided damaging the problem of motor, gear because of overloading, avoid causing the incident.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a load limiting device of a hoist block in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air motor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a hoist block according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the cross chain guide groove in the embodiment of the present invention.

In FIGS. 1-4:

1-shell, 2-transmission shaft, 3-sun gear, 4-planetary gear, 5-gear ring, 6-planet carrier, 7-hoisting sprocket, 8-friction plate, 9-adjusting block, 901-cylindrical groove, 902-annular groove, 10-belleville spring, 1001-first through hole, 11-load limiting ring, 1101-second through hole, 12-fastener, 13-load limiting plate, 14-nylon plug, 15-pneumatic motor, 1501-front cover, 1502-end cover, 1503-rotor, 1504-moving block, 1505-spring, 1506-brake block, 1507-housing, 1508-housing, 16-exhaust net and 17-cross chain guide groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

An object of this embodiment is to provide a hoist and limit for tonnage device thereof, solve among the prior art problem that the hoist easily damaged motor and gear, easily caused the incident under the overload state that exists.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1 and 2, in this embodiment, the hoist includes a housing 1, a speed reduction mechanism, and a lifting mechanism, the speed reduction mechanism is disposed in the housing 1, the speed reduction mechanism includes a transmission shaft 2, a sun gear 3, at least two planetary gears 4, a gear ring 5, and a planet carrier 6, the gear ring 5 is identical to a central axis of the sun gear 3, the transmission shaft 2 is connected to a power source of the hoist, the sun gear 3 is sleeved on the transmission shaft 2, each planetary gear 4 is engaged with the sun gear 3, the power source may be a pneumatic motor 15, a motor, etc., the gear ring 5 is engaged with each planetary gear 4, and the planet carrier 6 is sleeved on the transmission shaft 2 and is rotatably connected to a shaft of each planetary gear 4. Specifically, through holes can be formed in the planet carrier 6 at positions corresponding to the shafts of the planet gears 4, the shafts of the planet gears 4 extend into the corresponding through holes, and the shafts can rotate in the through holes, so that when the planet gears 4 rotate, the shafts rotate by taking the central shafts of the shafts as the shafts, namely, the shafts rotate in the corresponding through holes; when each planetary gear 4 revolves around the sun gear 3, that is, the shaft of each planetary gear 4 rotates around the transmission shaft 2, the shaft of each planetary gear 4 changes position, and further, the planet carrier 6 is driven to rotate around the transmission shaft 2. Elevating system includes hoisting sprocket 7, jack-up chain and lifting hook, as shown in fig. 3, hoisting sprocket 7 is connected with planet carrier 6, and the jack-up chain sets up on hoisting sprocket 7, and the lifting hook setting just is used for lifting by crane the heavy object at hoisting chain lower extreme, so planet carrier 6 rotates and can drive hoisting sprocket 7 and rotate, finally drives hoisting sprocket 7 and goes up and down.

As shown in fig. 1, friction plates 8 are provided on both sides of the ring gear 5, and the friction plates 8 on the side of the ring gear 5 facing the power source are in contact with the inner wall of the case 1. The load limiting device is arranged on one side of the gear ring 5, which is far away from a power source, and comprises an adjusting block 9, an elastic part and a load limiting ring 11, wherein the adjusting block 9 is fixed relative to the shell 1, the elastic part and the load limiting ring 11 are positioned between the adjusting block 9 and the gear ring 5, a groove and an annular bulge arranged in the groove are arranged on the side surface of the adjusting block 9, which faces the gear ring 5, so as to divide the groove into a cylindrical groove 901 and an annular groove 902, the cylindrical groove 901 is used for the end part of the transmission shaft 2 to stretch into, and the cylindrical groove 901 and the annular groove 902 are coaxial, a first through hole 1001 for the annular bulge to stretch into is arranged on the elastic part, the annular bulge stretches into the first through hole 1001, so that the elastic part stretches into the annular groove 902, a second through hole 1101 for the elastic part to stretch into is arranged on the load limiting ring 11, the elastic part stretches into the second through hole 1101, so that the elastic part stretches into the load limiting ring 11, further, therefore, the elastic element is pressed in the annular groove 902, the load limiting ring 11 is pressed on the friction plate 8 on the side surface of the gear ring 5 under the elastic action of the spring 1505 plate, the end part of the transmission shaft 2 sequentially passes through the load limiting ring 11 and the elastic element and extends into the column-shaped groove 901, the rotation of the transmission shaft 2 cannot be influenced, the adjusting block 9 is fixed relative to the shell 1, and the elastic element and the load limiting ring 11 rotate along with the transmission shaft 2. In a preferred embodiment, a safety catch is provided on the hook to prevent the weight from falling.

According to the arrangement, the friction force borne by the gear ring 5 depends on the elastic force of the elastic part, when the lifting hoist is not overloaded, the friction force borne by the gear ring 5 is smaller than the maximum friction force borne by the gear ring, namely when the lifting hoist works normally, the power source drives the transmission shaft and the sun gear 3 to rotate, the plurality of planet gears 4 meshed with the sun gear 3 revolve with each other, the gear ring 5 keeps still, and the planet gears 4 revolve to drive the planet carrier 6 to rotate so as to drive the lifting chain wheel to rotate; during overload, the load of ring gear 5 is greater than the frictional force that ring gear 5 received, the frictional force that ring gear 5 received is not enough to support ring gear 5 stationary, ring gear 5 will skid and begin to rotate, planetary gear 4 rotates in the original position around the axis of self, planetary gear 4 does not have the power take off of revolution, can not drive planet carrier 6 and rotate, lead to jack-up sprocket 7 can not rotate, the heavy object that the lifting hook promoted stops in the original position, just so avoided damaging the problem of motor, gear because of the overload, avoid causing the incident.

In other embodiments, the hoist may include a multi-stage reduction mechanism, assuming that the reduction mechanism is a first-stage reduction mechanism, the sun gear 3 of the next-stage reduction mechanism is connected to the carrier 6 of the first-stage reduction mechanism, and so on, the carrier 6 of the last-stage reduction mechanism is connected to the hoisting sprocket 7.

As an alternative embodiment, as shown in fig. 1, the adjusting block 9, the elastic member and the load limiting ring 11 are coaxial, and the section perpendicular to the transmission shaft 2 is circular.

So set up, this kind of symmetrical structure of regulating block 9, elastic component, limit for load ring 11 makes the relative stationary force of the arbitrary of the periphery of regulating block 9 and casing 1 all the same, and elastic component, limit for load ring 11 can follow transmission shaft 2 better and rotate when transmission shaft 2 rotates, thereby avoid elastic component, limit for load ring 11 to touch the production friction when rotating with casing 1's inner wall and cause the rotation unstable.

In an alternative embodiment, the friction plates 8 on both sides of the ring gear 5 are of a ring structure, and each friction plate 8 is coaxial with the ring gear 5.

So set up, transmission shaft 2 rotates the in-process, no matter limit for load ring 11 rotates to any position, all has frictional force and all friction all equals between limit for load ring 11 and the friction disc 8, keeps the size of frictional force unanimous.

As an alternative embodiment, a third through hole is provided in the annular groove 902, as shown in fig. 1, the third through hole penetrates through the adjusting block 9, and the end of the fastening member 12 abuts against the elastic member by passing through the third through hole from the side of the adjusting block 9 away from the elastic member by the fastening member 12. Specifically, through the elasticity degree of adjusting fastener 12, can adjust the power size that fastener 12 pushed up on the elastic component, further can adjust the elastic component and give the elastic force to limit for year ring 11, limit for year ring 11 just also can change to the extrusion force of ring gear 5, just also can adjust the size of frictional force between limit for year ring 11 and the friction disc 8 of ring gear 5 side, finally realize the regulation to the limit for year power size of ring gear 5. In the preferred embodiment, the fastener 12 is a screw nut.

So set up, through setting up third through-hole and fastener 12, can adjust the gravity size of the heavy object that hoist crane promoted, that is to say the limit for the tonnage size.

As an alternative embodiment, the elastic element is two belleville springs 10 which are arranged in an overlapping mode, a load limiting plate 13 is arranged between the adjusting block 9 and the belleville springs 10, as shown in FIG. 1, the load limiting plate 13 is sleeved on the transmission shaft 2, the plane of the load limiting plate 13 is perpendicular to the transmission shaft 2, and the fastening element 12 is abutted on the load limiting plate 13.

The fastening piece 12 penetrates through the third through hole to be abutted against the elastic piece, the elastic piece is the belleville spring 10, the fastening piece 12 cannot be directly abutted against the belleville spring 10 due to the fact that the belleville spring 10 is inclined, the load limiting plate 13 which is of a plane structure is arranged between the adjusting block 9 and the belleville spring 10 firstly, the fastening piece 12 can be abutted against the plane, the fastening piece 12 extrudes the load limiting plate 13, the load limiting plate 13 transmits pressure to the belleville spring 10, and therefore the later stage of stress of the belleville spring 10 cannot be influenced and the load limiting force is convenient to adjust.

As an alternative embodiment, as shown in fig. 1, a nylon plug 14 is disposed in the cylindrical groove 901 of the adjusting block 9, and the nylon plug 14 is a block piece made of nylon, so as to separate the transmission shaft 2 and the adjusting block 9. The nylon plug 14 is provided with a fourth through hole along the axial direction, and the end part of the transmission shaft 2 extends into the fourth through hole.

The regulating block 9 is fixed relative to the casing 1, and the relative regulating block 9 of transmission shaft 2 rotates and easily produces friction and noise, so sets up, and nylon blocks up 14 and separates transmission shaft 2 and regulating block 9, avoids transmission shaft 2 and the contact of limit for tonnage regulating block 9, and the noise abatement lightens weight, and the effect of nylon material is better.

The load limiting device of the hoist block is specifically described with reference to the above embodiments, in this embodiment, the hoist block includes a housing 1, a speed reducing mechanism, an elevating mechanism, and a load limiting device, the speed reducing mechanism is disposed in the housing 1, the speed reducing mechanism includes a transmission shaft 2, a sun gear 3, at least two planetary gears 4, a gear ring 5 and a planet carrier 6, the elevating mechanism includes a hoisting sprocket 7, a hoisting chain and a hook, friction plates 8 are disposed on two sides of the gear ring 5, the friction plates 8 on one side of the gear ring 5 facing the power source are in contact with the inner wall of the housing 1, and the two friction plates 8 are both in an annular structure and are both coaxial with the gear ring 5. The load limiting device is arranged on one side of the gear ring 5, which is far away from the pneumatic motor 15, and comprises an adjusting block 9, a belleville spring 10 and a load limiting ring 11, the three parts are coaxial, the cross sections of the adjusting block 9, the belleville spring 10 and the load limiting ring 11, which are perpendicular to the transmission shaft 2, are circular, the adjusting block 9 is fixed relative to the shell 1, the belleville spring 10 and the load limiting ring 11 are positioned between the adjusting block 9 and the gear ring 5, the side surface of the adjusting block 9, which faces the gear ring 5, is provided with a groove and an annular bulge arranged in the groove, so that the groove is divided into a cylindrical groove 901 and an annular groove 902, which are used for the end part of the transmission shaft 2 to stretch into, the cylindrical groove 901 is coaxial with the annular groove 902, the belleville spring 10 is provided with a first through hole 1001 for the annular bulge to stretch into, the first through hole 1001, So that the belleville spring 10 extends into the load limiting ring 11, further, the load limiting ring 11 can extend into the annular groove 902 to press the belleville spring 10 into the annular groove 902, the load limiting ring 11 can be pressed on the friction plate 8 on the side surface of the gear ring 5 under the elastic action of the belleville spring 10, the end part of the transmission shaft 2 sequentially passes through the load limiting ring 11 and the belleville spring 10 and extends into the cylindrical groove 901, and the rotation of the transmission shaft 2 cannot be influenced. Be equipped with the third through-hole that runs through regulating block 9 in the ring channel 902, through fastener 12 by one side that regulating block 9 deviates from the elastic component pass the third through-hole, the tip of fastener 12 can push up on the elastic component, can adjust the size of the limit for load power of ring gear 5 through the elasticity degree of adjusting fastener 12. A load limiting plate 13 is arranged between the adjusting block 9 and the belleville spring 10, the load limiting plate is sleeved on the transmission shaft 2, the plane of the load limiting plate 13 is perpendicular to the transmission shaft 2, and the fastening piece 12 is propped against the load limiting plate 13. The cylindrical groove 901 is internally provided with a nylon plug 14 to separate the transmission shaft 2 and the adjusting block 9, the nylon plug 14 is provided with a fourth through hole along the axial direction, and the end part of the transmission shaft 2 extends into the fourth through hole.

According to the arrangement, when the crane is not overloaded, the power source drives the transmission shaft and the sun gear 3 to rotate, the gear ring 5 is kept still, and the planet gear 4 revolves to drive the planet carrier 6 to rotate so as to drive the hoisting chain wheel to rotate; during overload, the load of the gear ring 5 is larger than the friction force received by the gear ring 5, the gear ring 5 slips and rotates, the planetary gear 4 rotates in the original position around the axis of the planetary gear 4, the planetary gear 4 does not have revolution power output and cannot drive the planet carrier 6 to rotate, so that the hoisting chain wheel 7 cannot rotate, and the heavy object lifted by the lifting hook stays in the original position, thereby avoiding the problem that the motor and the gear are damaged due to overload, and avoiding causing safety accidents.

The utility model also provides a hoist, limit for tonnage device including above-mentioned embodiment still includes casing 1, reduction gears, elevating system etc.. According to the arrangement, the load limiting device of the hoisting hoist can limit the load of a hoisting heavy object, and avoids damaging the motor and the gear by overload, thereby avoiding causing safety accidents.

In a preferred embodiment, the power source is an air motor 15, as shown in fig. 2, the air motor 15 includes a cylinder housing fixed relative to the housing 1, an output shaft disposed in the cylinder housing, and a rotor 1503 sleeved on the output shaft, the output shaft is connected to the transmission shaft 2, fan blades 1507 are disposed on the outer periphery of the rotor 1503, the cylinder housing includes a housing 1508, a front cover 1501 and an end cover 1502 disposed at two ends of the housing 1508, a moving block 1504 is disposed between the rotor 1503 and the end cover 1502, the moving block 1504 is sleeved on the output shaft, and the side of the moving block 1504 facing the end cover 1502 is provided with a spring 1505, the sides of the front cover 1501 and the moving block 1504 facing the rotor 1503 are provided with a brake pad 1506, when airflow enters the cylinder shell, the moving block 1504 moves towards the end cover 1502 along the output shaft under the action of the airflow, the rotor 1503 is separated from the two brake pads 1506, the rotor 1503 rotates, and the spring 1505 is in contact with the end cover 1502 and generates elastic deformation; when no air flow exists in the cylinder, the spring 1505 recovers elastic deformation, two ends of the rotor 1503 respectively contact with the two brake pads 1506 to generate braking, and the rotor 1503 stops rotating. Preferably, the moving block 1504 is made of aluminum, which has good heat dissipation performance.

The brake system of a common pneumatic hoist is easy to fail, so that the brake fails, a lifted heavy object slides downwards, and the brake structure is directly arranged in the pneumatic motor 15 of the pneumatic hoist, so that the pneumatic motor 15 has the brake function directly in the working process,

as an alternative embodiment, the casing 1 comprises a rear cover arranged on the side of the adjustment block 9, as shown in fig. 1, and provided with an exhaust network 16 for exhausting the exhaust gases generated during the operation of the pneumatic motor 15.

So arranged, the air from the air motor 15 will be vented to the atmosphere through the cavity in the housing 1 and the quick drain net.

In an alternative embodiment, the lifting sprocket 7 is provided with a cross chain guide slot 17, the cross chain guide slot 17 is used for the lifting chain to extend into, and the specific structure shape of the cross chain guide slot 17 is shown in fig. 4 to prevent the lifting chain from rotating relative to the lifting sprocket 7.

The guide groove of the chain of the common hoisting block for lifting the heavy object is very simple, and the chain is easy to rotate or twist, so that loss or accidents are caused. So set up, cross guide chain groove 17 can prevent effectively that the jack-up chain from rotating or warping to avoid damaging jack-up chain and jack-up calabash body.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The utility model provides a plurality of schemes contain the basic scheme of itself, mutual independence to restrict each other, but it also can combine each other under the condition of not conflicting, reaches a plurality of effects and realizes jointly.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A load limiting device of a hoist block, wherein the hoist block comprises:

a housing (1);

the speed reducing mechanism is arranged in the shell (1), and comprises a transmission shaft (2) connected with a power source of the hoist crane, a sun gear (3) sleeved on the transmission shaft (2), at least two planetary gears (4) meshed with the sun gear (3), a gear ring (5) meshed with each planetary gear (4) and a planet carrier (6) sleeved on the transmission shaft (2) and rotatably connected with shafts of the planetary gears (4), wherein the gear ring (5) is consistent with a central shaft of the sun gear (3);

the lifting mechanism comprises a hoisting chain wheel (7) connected with the planet carrier (6), a hoisting chain arranged on the hoisting chain wheel (7) and a lifting hook arranged at the lower end of the hoisting chain and used for hoisting a heavy object;

it is characterized by comprising:

friction plates (8) are arranged on two sides of the gear ring (5), and the friction plates (8) on one side, facing the power source, of the gear ring (5) are in contact with the inner wall of the shell (1); the load limiting device is arranged on one side, deviating from the power source, of the gear ring (5), and comprises an adjusting block (9) fixed relative to the shell (1), an elastic piece and a load limiting ring (11) positioned between the adjusting block (9) and the gear ring (5), a groove and an annular protrusion arranged in the groove are arranged on the side surface, facing the gear ring (5), of the adjusting block (9), so that the groove is divided into a cylindrical groove (901) and an annular groove (902) for the end portion of the transmission shaft (2) to extend into, the cylindrical groove (901) and the annular groove (902) are coaxial, a first through hole (1001) for the annular protrusion to extend into is arranged on the elastic piece, so that the elastic piece extends into the annular groove (902), and a second through hole (1101) for the elastic piece to extend into is arranged on the load limiting ring (11), the load limiting ring (11) can extend into the annular groove (902) to press the elastic piece into the annular groove (902), the load limiting ring (11) is pressed on the friction plate (8) on the side surface of the gear ring (5) under the elastic action of the elastic piece, and the end part of the transmission shaft (2) sequentially passes through the load limiting ring (11) and the elastic piece and extends into the column-shaped groove (901).

2. The load limiting device according to claim 1, wherein the adjusting block (9), the elastic element and the load limiting ring (11) are coaxial and have a circular cross section perpendicular to the transmission shaft (2).

3. The load limiting device according to claim 1, characterized in that the friction plates (8) on both sides of the ring gear (5) are of annular configuration and are coaxial with the ring gear (5).

4. The load limiting device according to claim 1, characterized in that a third through hole is arranged in the annular groove (902) and penetrates through the adjusting block (9), a fastening piece (12) penetrates through the third through hole from the side of the adjusting block (9) far away from the elastic piece, the end of the fastening piece (12) is abutted against the elastic piece, and the load limiting force of the gear ring (5) can be adjusted by adjusting the tightness of the fastening piece (12).

5. The load limiting device according to claim 4, characterized in that the elastic member is two belleville springs (10) arranged in an overlapping manner, a limiting plate (13) is arranged between the adjusting block (9) and the belleville springs (10), the limiting plate (13) is sleeved on the transmission shaft (2), the plane of the limiting plate (13) is perpendicular to the transmission shaft (2), and the fastening member (12) is pressed against the limiting plate (13).

6. The load limiting device according to claim 1, wherein a nylon plug (14) is arranged in the cylindrical groove (901) of the adjusting block (9) to space the transmission shaft (2) and the adjusting block (9), the nylon plug (14) is provided with a fourth through hole along the axial direction, and the end of the transmission shaft (2) extends into the fourth through hole.

7. A hoist, characterized in that it comprises a load limiting device, which is a load limiting device of a hoist as claimed in any one of claims 1-6.

8. A hoist as claimed in claim 7, characterized in that the power source is a pneumatic motor (15), the pneumatic motor (15) comprises a cylinder housing fixed relative to the housing (1), an output shaft arranged in the cylinder housing, and a rotor (1503) sleeved on the output shaft, the output shaft is connected to the transmission shaft (2), fan blades (1507) are arranged on the periphery of the rotor (1503), the cylinder housing comprises a housing body (1508), and a front cover (1501) and an end cover (1502) arranged at both ends of the housing body (1508), a moving block (1504) is arranged between the rotor (1503) and the end cover (1502), the moving block (1504) is sleeved on the output shaft, a spring (1505) is arranged on the side of the moving block (1504) facing the end cover (1502), and brake pads (1506) are arranged on the sides of the front cover (1501) and the moving block (1504) facing the rotor (1503), when air flow enters the cylinder shell, the moving block (1504) moves along the direction of the output shaft to the end cover (1502) under the action of the air flow, the rotor (1503) is separated from the two brake pads (1506), the rotor (1503) rotates, and the spring (1505) is in contact with the end cover (1502) and generates elastic deformation; when no air flow exists in the air cylinder, the spring (1505) restores elastic deformation, two ends of the rotor (1503) are respectively contacted with the two brake pads (1506) to generate braking, and the rotor (1503) stops rotating.

9. Hoist as claimed in claim 8, characterized in that the housing (1) comprises a rear cover arranged on the side of the adjusting block (9), which rear cover is provided with an exhaust network (16) for the exhaust gases generated by the air motor (15).

10. Hoist as claimed in claim 7, characterized in that the hoisting sprocket (7) is provided with a cross-shaped chain guide slot (17) for the hoisting chain to extend into in order to prevent the hoisting chain from rotating relative to the hoisting sprocket (7).

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