CN210764072U

CN210764072U - JDT stage endless chain electric hoist

Info

Publication number: CN210764072U
Application number: CN201921665326.0U
Authority: CN
Inventors: 刘爽
Original assignee: Mutian Hebei Lifting Equipment Manufacturing Co ltd
Current assignee: Mutian Hebei Lifting Equipment Manufacturing Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-16
Anticipated expiration: 2029-09-30

Abstract

The utility model relates to a hoisting equipment technical field discloses a JDT stage endless chain electric block, which comprises a housin, including a motor, an end cap, a controller, and a cover plate, two electromagnetic brake mechanisms, elevating system, two electromagnetic brake mechanisms include the box, the coil base, two solenoid, two armatures, two friction assembly, the coil base, the rotatable cover of two armatures is established on motor output shaft, motor output shaft's axial displacement can be followed to two armatures, two sets of friction assembly fixed cover are established on the output shaft of motor, be equipped with a plurality of first elastic components on the solenoid, each first elastic component other end all contacts with the armature that corresponds, elevating system includes hoisting sprocket, the chain, lower lifting hook. The scheme has double pressing force and friction force, and the output shaft of the motor needs to output larger output torque to rotate than that in the prior art. So set up, solved among the prior art stage endless chain electric block and adopted single electromagnetism brake failure, or braking system consumes excessively to cause the problem that braking system damaged.

Description

JDT stage endless chain electric hoist

Technical Field

The utility model relates to a hoisting equipment technical field, more specifically say, relate to a JDT stage endless chain electric block.

Background

The stage electric chain block is used to complete the hoisting operation of the lamplight assembly frame in various performances on the stage, the present stage electric chain block adopts a single electromagnetic brake mechanism, the output shaft of the motor is connected with the single electromagnetic brake mechanism, the single electromagnetic brake is that an electromagnetic coil, a spring, an armature and a friction plate are arranged on one side of a coil seat, when the power is not on, the armature is pressed on the friction plate under the action of the spring, the other side of the friction plate is contacted with the box body of the single electromagnetic brake mechanism, the output torque of the motor can not overcome the friction force under the action of the friction force, so the brake can not rotate, but the single electromagnetic brake is easy to cause the brake failure, namely, the single electromagnetic brake is not enough to make the output shaft of the motor can not rotate, and the brake system can be damaged if the brake system is excessively consumed, thereby shortening the service life of the product. Therefore, how to solve the problem that the stage endless chain electric block in the prior art adopts single electromagnetic brake to brake and fails, or the brake system is excessively consumed to cause damage to the brake system becomes a technical problem which is continuously solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a JDT stage chain electric block adopts single electromagnetic brake to cause the brake failure in order to solve the stage chain electric block among the prior art, or braking system consumes the problem that excessively causes braking system to damage. 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 JDT stage endless chain electric block, include:

the motor is arranged in the shell;

the double-electromagnetic brake mechanism comprises a box body, a coil base arranged in the box body, two electromagnetic coils arranged on two sides of the coil base respectively, two armatures arranged on one side of the two electromagnetic coils, which is far away from the coil base, in a one-to-one correspondence manner, and two friction components arranged on one side of the two armatures, which is far away from the electromagnetic coils, in a one-to-one correspondence manner, wherein the coil base and the two armatures are rotatably sleeved on the motor output shaft, the two armatures can move along the axial direction of the motor output shaft, the two groups of friction components are fixedly sleeved on the output shaft of the motor, a plurality of first elastic pieces are arranged on two sides of the coil base, the other end of each first elastic piece is contacted with the corresponding armature, and when the electromagnetic coils are not electrified, the two armatures respectively press the two friction components on the inner wall of the shell under the action of the first elastic pieces, so that the two friction assemblies are kept still, and the output shaft of the motor fixedly connected with the friction assemblies is kept still; when the electromagnetic coil is electrified, the two armatures move towards the direction close to the electromagnetic coil and compress the first elastic piece, so that the two armatures are separated from the two corresponding friction components, and the friction components can be driven to rotate by the motor output shaft;

the lifting mechanism comprises a hoisting chain wheel in transmission connection with an output shaft of the motor, a chain arranged on the hoisting chain wheel, and a lower lifting hook arranged at the tail end of the hoisting chain and used for lifting a heavy object.

Preferably, the friction assembly includes an annular structure and two first friction plates respectively fixedly disposed on end surfaces of two sides of the annular structure, the two first friction plates protrude from the end surface of the annular structure, a spline hole is disposed on the annular structure, and a spline matched with the spline hole is disposed on an output shaft of the motor, so that the friction assembly is fixedly connected with the output shaft of the motor.

Preferably, the lifting device further comprises a speed reducer in transmission connection with the motor, and the lifting mechanism is fixedly connected with an output shaft of the speed reducer.

Preferably, the motor with the reduction gear realizes the transmission through overload protection ware and connects, overload protection ware includes the main shaft, overlaps and establish on the main shaft and with main shaft fixed connection's first helical gear and integral type friction disc, still include rotationally the cover establish on the main shaft periphery and set up the integral type friction disc is kept away from the second helical gear and the compress tightly the subassembly of one side of first helical gear, compress tightly the subassembly be used for with the second helical gear compresses tightly on the integral type friction disc, the second helical gear with the output shaft transmission of motor is connected, first helical gear with the input shaft transmission of reduction gear is connected.

Preferably, the integral type friction disc include with the friction ring that first helical gear contacted and connect be in connecting portion on the friction ring, the diameter of connecting portion is less than the diameter of friction ring, just the rotatable cover of second helical gear is established the periphery of connecting portion, compress tightly the subassembly and all establish on the periphery of connecting portion, and can follow the axial displacement of connecting portion.

Preferably, the pressing assembly includes a second friction plate contacting the second helical gear, a second elastic member, and an adjusting nut for pressing the second elastic member and the second friction plate against the second helical gear, and the adjusting nut is threadedly connected to the connecting portion.

Preferably, the first elastic member is a coil spring, and the second elastic member is a disc spring.

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

Preferably, the motor further comprises a phase sequence protector connected in a control loop of the motor.

Preferably, the motor further comprises a phase-lack protector connected in a control loop of the motor.

The utility model provides an among the technical scheme, JDT stage endless chain electric block includes casing, motor, two electromagnetic brake mechanisms and elevating system. The lifting mechanism comprises a hoisting chain wheel in transmission connection with an output shaft of the motor, a chain arranged on the hoisting chain wheel, and a lower lifting hook arranged at the tail end of the hoisting chain and used for lifting a heavy object. The double-electromagnetic brake mechanism comprises a box body, wherein a coil holder, two electromagnetic coils, two armatures and two friction components are arranged in the box body, the coil holder and the two armatures are sleeved on an output shaft of a motor in an empty mode, the two armatures can move along the axial direction of the output shaft of the motor, the two friction components are fixedly sleeved on the periphery of the output shaft of the motor, so that the friction components and the output shaft of the motor rotate synchronously, and first elastic pieces are arranged on the end faces, close to the armatures, of the two electromagnetic coils. When the two electromagnetic coils are electrified, the two armatures move towards the direction close to the electromagnetic coils and compress the first elastic piece, so that the armatures and the friction assembly are separated from each other, and the friction assembly can rotate along with the output shaft of the motor; when the two electromagnetic coils are not electrified, the two armatures move towards the two friction components under the action of the first elastic piece and are respectively pressed on the two friction components, the two friction components are both contacted with the inner wall of the box body, if the output shaft of the motor is required to rotate, the two friction components are required to rotate simultaneously, if the two friction components are required to rotate, the pressing force and the torque formed by the friction force on the two friction components are required to be overcome simultaneously, compared with the situation of one electromagnetic coil, one armature and one friction component in the prior art, when the electromagnetic coil of the scheme is not electrified, the double pressing force is achieved, the output shaft of the motor is required to rotate by the output torque which is larger than that in the prior art, and therefore the output shaft of the motor can be further ensured not to rotate, and effective braking is carried out. Therefore, the problem that the JDT stage endless chain electric block in the prior art adopts a single electromagnetic brake to cause brake failure or the brake system is excessively consumed to cause damage to the brake system is solved.

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 dual electromagnetic brake mechanism in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an overload protector in an embodiment of the present invention;

fig. 3 is a schematic structural view of a hoisting sprocket according to an embodiment of the present invention.

In FIGS. 1-3:

1-case, 2-coil holder, 3-electromagnetic coil, 4-armature, 5-first elastic element, 6-ring structure, 7-first friction plate, 8-spline hole, 9-main shaft, 10-first helical gear, 11-integrated friction plate, 111-friction ring, 112-connecting part, 12-second helical gear, 13-second friction plate, 14-second elastic element, 15-adjusting nut, 16-lifting chain wheel, 17-cross chain guide groove, 18-chain, 19-pin.

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 JDT stage chain electric block, solves among the prior art JDT stage chain electric block and adopts single electromagnetic brake to lead to that the brake is malfunctioning, or braking system consumes the problem that excessively causes braking system to damage.

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. 1-3, in the present embodiment, the JDT stage chain electric hoist includes a housing, a motor, a dual electromagnetic brake mechanism, and a lifting mechanism. The motor is arranged in the shell, and the lifting mechanism comprises a hoisting chain wheel 16 in transmission connection with an output shaft of the motor, a chain 18 arranged on the hoisting chain wheel 16, and a lower lifting hook at the tail end of the hoisting chain 18 and used for lifting a heavy object. The double-electromagnetic brake mechanism is connected with an output shaft of the motor and comprises a box body 1, and a coil holder 2, two electromagnetic coils 3, a plurality of first elastic pieces 5, two armatures 4 and two friction components which are positioned in the middle of the box body 1 are arranged in the box body 1. In other embodiments, the output shaft of the motor can be connected with a transmission shaft through a coupler, and the transmission shaft is connected with the double electromagnetic brake.

Specifically, as shown in fig. 1, the two half shells are fixedly connected to form a box 1 having a cavity, the two half shells are fixedly connected by bolts or the like, and at least one of the two half shells is provided with a hole for passing through an output shaft of the power supply. As shown in fig. 1, in the dual electromagnetic brake mechanism, along the direction from the half shell located on the left side to the half shell located on the right side, a friction component, an armature 4, an electromagnetic coil 3, a coil base 2, the electromagnetic coil 3, the armature 4, and the friction component are sequentially arranged in a box body 1. The electromagnetic motor further comprises a power supply, the power supply provides electric energy for the motor and the two electromagnetic coils 3, optionally, the two electromagnetic coils 3 are respectively connected in series in a control loop of the electromagnetic motor, and the two electromagnetic coils 3 can also be connected in series in the same control loop, so that the two electromagnetic coils 3 can only be simultaneously electrified and are simultaneously powered off; optionally, the two electromagnetic coils 3 are fixed on the coil base 2 through pins 19, or annular grooves are formed on two sides of the coil base 2, the two electromagnetic coils 3 are respectively embedded in the annular grooves of the coil base 2, and the upper and lower ends of the coil base 2 extend out of the outer side of the box body 1 and are provided with through holes for connecting with the outside; the two friction components are fixedly sleeved on the output shaft of the motor so as to enable the two friction components and the output shaft of the motor to synchronously rotate, and when the two friction components can rotate, the output shaft of the motor can rotate; the two armatures 4 are sleeved on the output shaft of the motor in a hollow way, the centers of the two armatures 4 are provided with holes for the output shaft of the motor to pass through, the output shaft of the motor can rotate in the holes, namely, the output shaft of the motor is rotatably connected with the two armatures 4, and the two armatures 4 can move along the axial direction of the output shaft of the motor; coil base 2 both ends all are fixed and are equipped with a plurality of first elastic component 5, and first elastic component 5 can be as the coil spring shown in fig. 1, and coil spring can fix on solenoid 3, and coil spring also can one end be established on the spring holder, and the spring holder passes modes such as bolt to be fixed on coil base 2, and the coil spring other end passes solenoid 3 and contacts with armature 4, all is equipped with the hole that supplies coil spring to pass on two solenoid 3. Preferably, the armature 4 is provided with a groove for cooperating with the first elastic member 5 and the pin 19, i.e. one end of the coil spring can extend into the groove, so that the armature 4 does not rotate with the output shaft of the motor, corresponding to the fact that the armature 4 is slidably connected to the electromagnetic coil 3 by the coil spring. When the two electromagnetic coils 3 are electrified, the two armatures 4 move towards the direction close to the electromagnetic coils 3 and compress the first elastic piece 5, so that the armatures 4 are separated from the friction assembly, and the friction assembly can rotate along with the output shaft of the motor; when the two electromagnetic coils 3 are not electrified, the two armatures 4 respectively move towards the two friction components and are pressed on the two friction components under the action of the first elastic piece 5, the other sides of the two friction components are in friction contact with the inner wall of the box body 1, if the two friction components are required to rotate, the pressing force acting on the two friction components and the torque formed by the friction force must be overcome simultaneously, compared with the condition that only one electromagnetic coil 3, one armature 4 and one friction component are arranged in a single electromagnetic brake in the prior art, when the electromagnetic coil 3 of the scheme is not electrified, the double pressing force is provided, so that the friction force between the friction components and the box body is larger, the output shaft of the motor needs to output larger torque to rotate than that in the prior art, namely, compared with the prior art, when the double electromagnetic brake mechanism of the scheme can ensure that the electromagnetic coils 3 are not electrified, the output shaft of the motor can not rotate, and the condition of ineffective braking can not occur.

So set up, solve among the prior art JDT stage endless chain electric block and adopt single electromagnetism brake failure, or braking system consumes the problem that excessively causes braking system to damage.

In a preferred embodiment, the friction assembly comprises a ring structure 6 and two first friction plates 7 fixedly arranged on two side end faces of the ring structure 6 respectively, and the two first friction plates 7 protrude out of the end face of the ring structure 6, so that one friction plate 7 is in contact with the inner wall of the box body 1 and the other friction plate is in contact with the armature 4. Preferably, two first friction discs 7 can be fixedly arranged on two sides of the annular structure 6 in a welded connection mode, and can also be processed in an integrated forming mode, and of course, can also be fixed on the annular structure in other connection modes, the two annular structures 6 are provided with spline holes 8, and an output shaft of the motor is provided with a spline matched with the spline holes 8, so that the friction assembly is fixedly connected with the output shaft of the motor.

According to the arrangement, the spline hole 8 is arranged on the annular structure 6, the output shaft of the motor is fixedly connected with the spline hole 8, and the output shaft of the friction assembly and the output shaft of the motor rotate synchronously.

As a preferred embodiment, the JDT stage endless chain electric block further comprises a speed reducer in transmission connection with the motor, and the lifting mechanism is fixedly connected with an output shaft of the speed reducer. The output shaft of the speed reducer is fixedly connected with a hoisting sprocket 16 in the lifting mechanism through a spline, so that the output shaft of the speed reducer and the hoisting sprocket 16 synchronously rotate.

The output shaft of motor and the input shaft of reduction gear realize the transmission through overload protection ware and are connected, and overload protection ware includes main shaft 9, first helical gear 10, integral type friction disc 11, compresses tightly the subassembly. Specifically, as shown in fig. 2, the first helical gear 10 and the integrated friction plate 11 are fixedly connected with the main shaft 9 in a key connection manner; the second helical gear 12 and the pressing assembly are sequentially sleeved on one side, away from the first helical gear 10, of the integrated friction plate 11 in an empty mode, namely the second helical gear 12 and the pressing assembly are rotatable relative to the main shaft 9, and the pressing assembly is used for pressing the second helical gear 12 on the integrated friction plate 11. Preferably, a transmission shaft is fixedly connected to an output shaft of the motor through a coupling, a gear engaged with the second helical gear 12 is fixedly arranged on the transmission shaft, and a gear engaged with the first helical gear 10 is fixedly sleeved on an input shaft of the speed reducer. JDT stage endless chain electric block normally works, when not overloading promptly, the power transmission of motor is for second helical gear 12, compress tightly subassembly and compress tightly second helical gear 12 on integral

type friction disc

11, 11 roughness in surface of integral type friction disc and second helical gear 12 frictional connection, make second helical gear 12 drive integral type friction disc 11 and rotate, thereby drive main shaft 9 and first helical gear 10 and rotate, the input shaft of reduction gear is transmitted and drive the reduction gear input shaft rotation to the power of first helical gear 10, thereby the motor passes through overload protection ware with the reduction gear and realizes rotatable coupling. When the motor is overloaded, the output torque of the motor exceeds the tolerance value of the overload protector, namely, the friction force formed between the second helical gear 12 and the integrated friction plate 11 by the pressing force applied to the second helical gear 12 by the pressing component is not enough to enable the second helical gear 12 to drive the integrated friction plate 11 to rotate, the second helical gear 12 slips and idles relative to the integrated friction plate 11, so that the integrated friction plate 11, the main shaft 9 and the first helical gear 10 are not driven to rotate, and the motor and the transmission mechanism are prevented from being damaged when the motor and the transmission mechanism are overloaded. The main shaft 9 both ends are equipped with the bearing, optionally, can be connected in JDT stage endless chain electric block's casing through this bearing frame matched with.

So set up, through having add overload protection ware, lead to motor and drive mechanism to damage, cause the problem of incident even when the load capacity of having avoided JDT stage endless chain electric block to exceed maximum load.

In a preferred embodiment, the integrated friction plate 11 includes a friction ring 111 contacting with the first helical gear 10 and a connecting portion 112 connected to the friction ring 111, an outer circumference of the friction ring 111 is provided with a rough structure, a diameter of the connecting portion 112 is smaller than a diameter of the friction ring 111, the second helical gear 12 is sleeved on the outer circumference of the connecting portion 112 and contacts with the friction ring, and the pressing assemblies are all sleeved on the outer circumference of the connecting portion 112 and can move along an axial direction of the connecting portion 112. The pressing assembly comprises a second friction plate 13 in contact with the second bevel gear 12, a second elastic part 14 and an adjusting nut 15 for pressing the second elastic part 14 and the second friction plate 13 on the second bevel gear 12, the second elastic part 14 is a disc spring, the second friction plate 13 and the second elastic part 14 are also sleeved on the connecting part 112 in an empty mode, the adjusting nut 15 is in threaded connection with the connecting part 112, the pressure applied to the disc spring by the adjusting nut can be changed by rotating the adjusting nut 15, so that the elastic force of the disc spring is adjusted, the pressing force applied to the second bevel gear 12 by the pressing assembly is adjusted, finally, the friction force between the second bevel gear 12 and the integrated friction plate 11 is adjusted, and the tolerance value of the overload protector is adjusted.

In an alternative embodiment, the lifting sprocket 16 is provided with a cross chain guide slot 17, the cross chain guide slot 17 is used for the lifting chain 18 to extend into, and the specific structure shape of the cross chain guide slot 17 is shown in fig. 3 to prevent the lifting chain 18 from twisting relative to the lifting sprocket 16.

The guide groove of the chain 18 of the general hoist for lifting the heavy object is very simple, and the chain 18 is easily rotated or twisted to cause a loss or an accident. So set up, cross guide chain groove 17 can prevent effectively that jack-up chain 18 from rotating or distorting to avoid damaging jack-up chain 18 and hoist crane body.

As an optional implementation mode, the JDT stage chain electric hoist further comprises a phase sequence protector and a phase loss protector connected in the motor control loop. The phase sequence protector and the open-phase protector are both connected in series in a control loop of the motor. Optionally, the phase sequence protector is selected from a JL-420 phase sequence protector, the open-phase protector is selected from a DZ15D-100390 phase sequence protector, or other types of phase sequence protectors and open-phase protectors are selected, and a person skilled in the art can clearly know the structure of the mutual protectors and the wiring mode of the mutual protectors, the motor and the power supply according to the types of the phase sequence protectors.

By the arrangement, the phase sequence protector can avoid safety accidents or equipment damage caused by motor reversal caused by reversal after the power phase sequence is reversed; the phase-lack protector can prevent that the line item lacks and leads to the motor to burn out.

The JDT stage chain electric hoist is specifically described with reference to the above embodiments, in this embodiment, the JDT stage chain electric hoist includes a housing, a motor and a dual electromagnetic brake mechanism, the motor is disposed in the housing, the dual electromagnetic brake mechanism includes a box body 1, a coil base 2 disposed in the box body 1, two electromagnetic coils 3 disposed on two sides of the coil base 2 respectively, two armatures 4 disposed on one side of the two electromagnetic coils 3 away from the coil base 2, and two friction assemblies disposed on one side of the two armatures 4 away from the electromagnetic coils 3, the coil base 2 and the two armatures 4 are rotatably sleeved on an output shaft of the motor, the two armatures 4 are movable along an axial direction of the output shaft of the motor, the two friction assemblies are fixedly sleeved on the output shaft of the motor, the two sides of the coil base 2 are provided with a plurality of coil springs, and the other end of each coil spring is in contact with the corresponding armature 4, the friction assembly comprises an annular structure 6 and two first friction plates 7 which are fixedly arranged on the end faces of two sides of the annular structure 6 respectively, the two first friction plates 7 protrude out of the end face of the annular structure 6, a spline hole 8 is formed in the annular structure 6, and a spline matched with the spline hole 8 is arranged on an output shaft of the motor so that the friction assembly is fixedly connected with the output shaft of the motor. When the electromagnetic coil 3 is not electrified, the two armatures 4 respectively press the two friction components on the inner wall of the shell under the action of the spiral spring so as to keep the two friction components immovable, thereby keeping the output shaft of the motor fixedly connected with the two friction components immovable; when the electromagnetic coil 3 is electrified, the two armatures 4 move towards the direction close to the electromagnetic coil 3 and compress the spiral spring, so that the two armatures 4 are separated from the two corresponding friction components, the friction components can rotate under the driving of the output shaft of the motor, and the lifting mechanism comprises a hoisting chain wheel 16 in transmission connection with the output shaft of the motor, a chain 18 arranged on the hoisting chain wheel 16 and a lower lifting hook at the tail end of the hoisting chain 18 and used for lifting a heavy object. JDT stage endless chain electric block still includes the reduction gear of being connected with motor drive, the output shaft fixed connection of elevating system and reduction gear, the motor passes through overload protection ware with the reduction gear and realizes the transmission and be connected, overload protection ware includes main shaft 9, the cover is established on main shaft 9 and with main shaft 9 fixed connection's first helical gear 10 and integral type friction disc 11, still including rotationally the cover establish on main shaft 9 periphery and set up the second helical gear 12 and compress tightly the subassembly of keeping away from one side of first helical gear 10 at integral type friction disc 11, it is used for compressing tightly second helical gear 12 on integral type friction disc 11 to compress tightly the subassembly, second helical gear 12 is connected with the output shaft transmission of motor, first helical gear 10 is connected with the input shaft transmission of reduction gear. The integrated friction plate 11 comprises a friction ring 111 contacting with the first helical gear 10 and a connecting portion 112 connected to the friction ring 111, the diameter of the connecting portion 112 is smaller than that of the friction ring 111, the second helical gear 12 is rotatably sleeved on the periphery of the connecting portion 112, and the pressing assemblies are all sleeved on the periphery of the connecting portion 112 and can move along the axial direction of the connecting portion 112. The pressing assembly comprises a second friction plate 13 which is in contact with the second bevel gear 12, a disc spring and an adjusting nut 15 which is used for pressing the disc spring and the second friction plate 13 on the second bevel gear 12, and the adjusting nut 15 is in threaded connection with the connecting part 112. The lifting sprocket 16 is provided with a cross chain guide slot 17 for the chain 18 to extend into to prevent the chain 18 from rotating relative to the lifting sprocket 16. The phase sequence protector and the open-phase protector are connected in a control loop of the motor.

So set up, solved among the prior art stage endless chain electric block and adopted single electromagnetism brake failure through addding two electromagnetic brake mechanisms, or the problem that braking system damaged is excessively caused in braking system consumption. In addition, the motor and the transmission mechanism are prevented from being damaged during overload by additionally arranging the overload protector.

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

1. A JDT stage chain electric hoist is characterized by comprising

The motor is arranged in the shell;

the double-electromagnetic brake mechanism comprises a box body (1), a coil base (2) arranged in the box body (1), two electromagnetic coils (3) respectively arranged at two sides of the coil base (2), two armatures (4) arranged at one side of the two electromagnetic coils (3) far away from the coil base (2) in a one-to-one correspondence manner, and two friction components arranged at one side of the two armatures (4) far away from the electromagnetic coils (3), wherein the coil base (2) and the two armatures (4) are sleeved on an output shaft of the motor in an empty manner, the two armatures (4) can move along the axial direction of the output shaft of the motor, the two groups of friction components are fixedly sleeved on the output shaft of the motor, and a plurality of first elastic components (5) are arranged on the end face, close to the armatures (4), of the electromagnetic coils (3), the other end of each first elastic piece (5) is in contact with the corresponding armature (4), when the electromagnetic coil (3) is not electrified, the two armatures (4) respectively press the two friction components on the inner wall of the shell under the action of the first elastic pieces (5) so as to keep the two friction components immovable, and therefore the output shaft of the motor fixedly connected with the two friction components is kept immovable; when the electromagnetic coil (3) is electrified, the two armatures (4) move towards the direction close to the electromagnetic coil (3) and compress the first elastic piece (5) so that the two armatures (4) are separated from the two corresponding friction components, and the friction components can be driven to rotate by the motor output shaft;

the lifting mechanism comprises a hoisting chain wheel (16) in transmission connection with an output shaft of the motor, a chain (18) arranged on the hoisting chain wheel (16), and a lower lifting hook arranged at the tail end of the chain (18) and used for lifting a heavy object.

2. The JDT stage chain electric block of claim 1, wherein the friction assembly comprises an annular structure (6) and two first friction plates (7) fixedly arranged on end surfaces of two sides of the annular structure (6), the two first friction plates (7) protrude out of the end surface of the annular structure (6), a spline hole (8) is formed in the annular structure (6), and a spline matched with the spline hole (8) is formed in an output shaft of the motor, so that the friction assembly is fixedly connected with the output shaft of the motor.

3. The JDT stage endless chain electric hoist of claim 1, further comprising a speed reducer in transmission connection with the motor, wherein the lifting mechanism is fixedly connected with an output shaft of the speed reducer.

4. The JDT stage chain electric block of claim 3, wherein the motor is in transmission connection with the reducer through an overload protector, the overload protector comprises a main shaft (9), a first helical gear (10) and an integrated friction plate (11), wherein the first helical gear (10) and the integrated friction plate (11) are sleeved on the main shaft (9) and are fixedly connected with the main shaft (9), the overload protector also comprises a second helical gear (12) and a pressing component, the second helical gear (12) and the pressing component are rotatably sleeved on the periphery of the main shaft (9) and are arranged on one side, away from the first helical gear (10), of the integrated friction plate (11), the pressing component is used for pressing the second bevel gear (12) on the integrated friction plate (11), the second bevel gear (12) is in transmission connection with an output shaft of the motor, and the first bevel gear (10) is in transmission connection with an input shaft of the speed reducer.

5. The JDT stage chain electric block of claim 4, wherein the integrated friction plate (11) comprises a friction ring (111) in contact with the first helical gear (10) and a connecting part (112) connected to the friction ring (111), the diameter of the connecting part (112) is smaller than that of the friction ring (111), the second helical gear (12) is rotatably sleeved on the outer periphery of the connecting part (112), and the pressing components are all sleeved on the outer periphery of the connecting part (112) and can move along the axial direction of the connecting part (112).

6. The JDT stage endless chain electric block of claim 5, wherein the pressing assembly comprises a second friction plate (13) in contact with the second helical gear (12), a second elastic member (14), and an adjusting nut (15) for pressing the second elastic member (14) and the second friction plate (13) on the second helical gear (12), the adjusting nut (15) being in threaded connection with the connecting portion (112).

7. The JDT stage endless chain electric hoist according to claim 6, wherein the first elastic member (5) is a coil spring and the second elastic member (14) is a disc spring.

8. The JDT stage endless chain electric hoist as claimed in claim 1, wherein the hoisting sprocket (16) is provided with a cross chain guide slot (17) for the chain (18) to extend into to prevent the chain (18) from rotating relative to the hoisting sprocket (16).

9. The JDT stage chain hoist of claim 1, further comprising a phase sequence protector connected in a control loop of the motor.

10. The JDT stage chain hoist of claim 1, further comprising a phase loss protector connected in a control circuit of the motor.