阅读说明：本技术 吊机的限重保护机构、吊机及汽车吊 (Weight limit protection mechanism of crane, crane and truck crane ) 是由 王东旭 李晓华 郑荃元 于 2018-06-28 设计创作，主要内容包括：本发明涉及吊机的限重保护机构、吊机及汽车吊,该限重保护机构包括导槽,竖向设于吊机上；滑轮,其轴滑动连接于导槽,吊机吊绳绕过滑轮；限重部件,位于轴下部,限重部件包括弹性支撑组件和调节组件,弹性支撑组件用于支撑轴,调节组件用于调节弹性支撑组件的松紧程度；限位开关,位于轴下部且与轴具有间隙,限位开关用于启闭吊机电机。运用该限重保护机构,起吊超重,吊绳受力传递给弹性支撑组件,弹性支撑组件压缩,滑轮轴移动触碰限位开关,限位开关使电机断电,停止起吊,吊绳解除过载后,弹性支撑组件复位并顶升滑轮轴,轴解除与限位开关的接触,限位开关复位并对电机通电,该限重保护机构结构简单,小巧实用,价格低廉,安全可靠。(The invention relates to a weight limit protection mechanism of a crane, the crane and a truck crane, wherein the weight limit protection mechanism comprises a guide groove which is vertically arranged on the crane; the shaft of the pulley is connected with the guide groove in a sliding manner, and the crane lifting rope winds around the pulley; the weight limiting component is positioned at the lower part of the shaft and comprises an elastic supporting component and an adjusting component, the elastic supporting component is used for supporting the shaft, and the adjusting component is used for adjusting the tightness degree of the elastic supporting component; and the limit switch is positioned at the lower part of the shaft and has a gap with the shaft, and the limit switch is used for starting and stopping the crane motor. The application should limit for weight protection mechanism lifts by crane overweight, and the lifting rope atress is transmitted for elastic support subassembly, and elastic support subassembly compresses, and the loose pulley axle removes touching limit switch, and limit switch makes the motor outage, stops to lift by crane, and after the overload was relieved to the lifting rope, elastic support subassembly reset and jacking loose pulley axle, the axle was relieved with limit switch's contact, and limit switch resets and switches on the electricity to the motor, this limit for weight protection mechanism simple structure, small and exquisite practicality, low price, safe and reliable.)

1. A weight limit protection mechanism of a crane is characterized by comprising:

the guide groove (100) is vertically arranged on the crane;

a pulley (101), wherein a shaft (102) of the pulley (101) is connected with the guide groove (100) in a sliding manner, and a crane lifting rope (110) is wound around the pulley (101);

the weight limiting component (120) is arranged on the crane and is positioned at the lower part of the shaft (102), the weight limiting component (120) comprises an elastic supporting assembly (121) and an adjusting assembly (122), the elastic supporting assembly (121) is used for supporting the shaft (102), and the adjusting assembly (122) is used for adjusting the tightness degree of the elastic supporting assembly (121);

the limit switch (130) is arranged on the crane, is positioned at the lower part of the shaft (102) and has a gap with the shaft (102), and the limit switch (130) is used for starting and stopping the crane motor (211).

2. The weight limit protection mechanism of a crane according to claim 1, further comprising a connecting member (140), wherein the connecting member (140) is provided on the crane, the connecting member (140) supports the shaft (102), and the connecting member (140) contacts the elastic support assembly (121).

3. The weight limit protection mechanism of a crane according to any of claims 1-2, wherein the resilient support assembly (121) comprises a spring and the adjustment assembly (122) comprises an adjustment nut.

4. A crane, comprising a vertical column (200), a suspension arm (201) and a supporting arm (202), wherein the weight-limiting protection mechanism of the crane according to any one of claims 1-3 is applied, the suspension arm (201) is hinged to the vertical column (200), one end of the supporting arm (202) is hinged to the suspension arm (201), the other end is detachably connected to the vertical column (200), the weight-limiting protection mechanism is arranged on the vertical column (200), a winch (210) and the motor (211) are arranged at the lower part of the vertical column (200), the winch (210) is connected with the motor (211), one end of the lifting rope (110) is connected to the winch (210), the other end of the lifting rope (110) is guided by a plurality of fixed pulleys and then led out from the free end of the suspension arm (201) and connected with a lifting hook (220), the lifting hook (220) is detachably connected to the vertical column (200), the motor (211) drives the winch (210) to rotate, the lifting rope (110) is driven to pull the lifting hook (220), and the upright post (200) in the folding state is unfolded or the upright post (200) in the unfolding state is folded.

5. The crane according to claim 4, characterized in that the upright column (200) is vertically provided with a clamping groove (203), the clamping groove (203) is provided with a plurality of clamping interfaces, the supporting arm (202) moves linearly in the clamping groove (203), and the supporting arm (202) is detachably connected to one of the clamping interfaces.

6. A crane according to claim 5, characterized in that the supporting arm (202) is provided with one fixed pulley, the boom (201) is provided with two fixed pulleys, the two fixed pulleys on the boom (201) are respectively arranged at two sides of the supporting arm (202), the lifting rope (110) is led out from the winch (210), the lifting rope (110) passes through the fixed pulley (101) and then is guided to the fixed pulley on the supporting arm (202), the lifting rope (110) passes through the fixed pulley on the supporting arm (202) and then is guided to the fixed pulley on the boom (201) close to one side of the upright (200) and is guided to the other fixed pulley on the boom (201), and finally the lifting rope (110) is connected with the lifting hook (220).

7. The crane of claim 4, further comprising an axle seat (230) and a brake, wherein the axle seat (230) is rotatably connected to the mast (200), and the brake is used for fixing the mast (200) and the axle seat (230) relative to each other after the crane is adjusted in position.

8. The crane according to claim 7, wherein the brake comprises a positioning handle (231), a positioning pin (232) and a plurality of positioning holes (233), the positioning handle (231) and the positioning pin (232) are arranged on the shaft seat (230), all the positioning holes (233) are arranged on the upright post (200), the positioning pin (232) is adapted to each positioning hole (233), and the positioning handle (231) is used for inserting or extracting the positioning pin (232) into or from one positioning hole (233).

9. A truck crane, comprising a mounting frame (300) arranged on a vehicle and a crane according to any one of claims 5 to 8, wherein the mounting frame (300) is provided with a steering seat (301), the steering seat (301) is connected with a shaft seat (230), and the shaft seat (230) is rotatably connected with the upright post (200).

10. Truck crane according to claim 9, characterized in that the mounting frame (300) is provided with support legs for stabilizing the overall structure.

Technical Field

The invention relates to the field of hoisting equipment, in particular to a weight limit protection mechanism of a crane, the crane and a truck crane.

Background

Because simple structure, the bearing is limited, generally does not set up limit for weight protection mechanism, when using, if the super heavy object of handling can cause the loop wheel machine structural damage, unable use.

Disclosure of Invention

The invention aims to: the small crane in the prior art is simple in structure and limited in bearing, a weight limiting protection mechanism is not generally arranged, and when the small crane is used, if a lifting overweight object can cause the problem that the crane is structurally damaged and cannot be used, the weight limiting protection mechanism, the crane and the truck crane of the crane are provided.

In order to achieve the purpose, the invention adopts the technical scheme that:

a weight limit protection mechanism for a hoist comprising:

the guide groove is vertically arranged on the crane;

a shaft of the pulley is slidably connected to the guide groove, and a crane lifting rope is wound around the pulley;

the weight limiting component is arranged on the crane and is positioned at the lower part of the shaft, the weight limiting component comprises an elastic supporting component and an adjusting component, the elastic supporting component is used for supporting the shaft, and the adjusting component is used for adjusting the tightness degree of the elastic supporting component;

the limit switch is arranged on the crane, is positioned at the lower part of the shaft and has a gap with the shaft, and is used for starting and stopping a crane motor;

the lifting rope applies pressure to the pulley when stressed, the limit switch is connected with the motor through the control circuit, the motor is used for drawing the lifting rope, and the gap is a distance corresponding to safety storage after the lifting of the crane exceeds a weight limit.

The shaft of the pulley can move up and down along the guide groove, but the adjusting component of the weight limiting component applies pretightening force to the elastic supporting component in advance, the elastic supporting component supports the shaft and limits the movement of the shaft in the guide groove, and when the motor rotates to drive the lifting rope to lift an object, the lifting rope is stressed to press down the pulley; when the converted value of the weight of the object lifted by the lifting rope is smaller than or equal to the pre-tightening force set value, the force borne by the shaft is not enough to push the elastic supporting component to compress, the motor continues to rotate, and the lifting rope works normally to lift; when the converted value of the weight of the object lifted by the lifting rope is larger than the pre-tightening force set value, the shaft presses the elastic supporting assembly, the elastic supporting assembly is stressed and compressed, the shaft moves along the guide groove, the shaft touches the limit switch after running the gap, the limit switch cuts off the power of the motor through the control circuit, and the motor is turned off and stops lifting; the lifting rope is unloaded, the elastic supporting assembly resets and jacks the shaft under the action of elastic force, the shaft is released from contact with the limit switch, and the limit switch resets and energizes the motor through the control circuit.

By adopting the weight limit protection mechanism, when the crane is lifted, the weight limit set by the weight limit protection mechanism is exceeded, the stress of the lifting rope is transmitted to the elastic support component, the elastic support component is compressed, the pulley shaft moves and touches the limit switch, the limit switch cuts off the power of the motor, so that the crane stops lifting, the structure of the crane is protected from overload damage, after the overload of the lifting rope is relieved, the elastic support component resets and jacks up the pulley shaft, the shaft is relieved from the contact with the limit switch, the limit switch resets and powers on the motor, and the crane restores to the working state.

Preferably, the weight limit range of the weight limit protection mechanism is 5% -10% of the rated hoisting weight.

Preferably, the weight limit protection mechanism further comprises a connecting part, the connecting part is arranged on the crane and supports the shaft, and the connecting part contacts the elastic support assembly.

By adopting the structure, the shaft is connected with the elastic supporting component through the connecting component, the problem that the shaft and the elastic supporting component are arranged at different positions is solved, the structure of the crane is optimized, the connecting component can be used as a force arm to amplify the pretightening force of the elastic supporting component, and the bearing safety performance of the crane is greatly improved.

Preferably, the resilient support assembly comprises a spring and the adjustment assembly comprises an adjustment nut.

Preferably, the weight limiting component and the limit switch are arranged in parallel.

The invention also provides a crane, which comprises an upright post, a suspension arm and a supporting arm, wherein the weight limit protection mechanism of the crane is applied to any one of the above parts, the suspension arm is hinged with the upright post, one end of the supporting arm is hinged with the suspension arm, the other end of the supporting arm is detachably connected with the upright post, the weight limit protection mechanism is arranged on the upright post, a winch and a motor are arranged at the lower part of the upright post, the winch is connected with the motor, one end of a lifting rope is connected with the winch, the other end of the lifting rope is led out from the free end of the suspension arm after being guided by a plurality of fixed pulleys and is connected with a lifting hook, the lifting hook is detachably connected with the upright post, and the motor drives the winch to rotate to drive the lifting rope to pull the lifting hook so that the upright post in a.

When the crane works and lifts, the weight is beyond the limit weight set by the weight limit protection mechanism, the lifting rope is stressed and transmitted to the elastic support assembly, the elastic support assembly is compressed, the pulley shaft moves and touches the limit switch, the limit switch cuts off the power of the motor, so that the crane stops lifting, the structure of the crane is protected from overload damage, after the lifting rope is relieved from overload, the elastic support assembly resets and jacks the pulley shaft, the shaft is relieved from contact with the limit switch, the limit switch resets and powers on the motor, and the crane restores to the working state.

Preferably, the vertical joint groove that sets up on the stand, be equipped with a plurality of joint interface on the joint groove, the support arm is in linear motion in the joint groove, the support arm can be dismantled connect in one of them joint interface.

The lifting rope is positioned on the supporting arm, the fixed pulleys are guided to be positioned on the supporting arm after the fixed pulleys are guided, the lifting rope is positioned on the supporting arm and is close to the fixed pulleys on the lifting arm on one side of the stand column, the fixed pulleys are guided to be positioned on the lifting arm, and finally the lifting rope is connected with the lifting hook.

By adopting the structure, when the crane is in a storage state, the motor drives the winch to rotate forwards, the winch winds the lifting rope, the lifting rope pulls and finally tightens the lifting hook, then the lifting rope pulls the supporting arm to move upwards, the supporting arm moves in the clamping groove, and after the supporting arm is connected with one clamping port, the crane is in a working state capable of lifting; after the connection between the supporting arm and the clamping interface is released, the motor drives the winch to rotate reversely, the supporting arm moves downwards, the suspension arm is folded towards the stand column, and the crane returns to the storage state.

Preferably, the crane further comprises a shaft seat and a brake, the shaft seat is rotatably connected with the upright post, and the brake is used for fixing the upright post and the shaft seat relatively after the crane is adjusted in place.

Preferably, the brake includes a positioning handle, a positioning pin and a plurality of positioning holes, the positioning handle and the positioning pin are disposed on the shaft seat, all the positioning holes are disposed on the upright post, the positioning pin is adapted to each positioning hole, and the positioning handle is used for inserting or extracting the positioning pin into or from one positioning hole.

The invention also provides a truck crane which comprises an installation frame arranged on a vehicle and the crane as described in any one of the above, wherein the installation frame is provided with a steering seat, the steering seat is connected with a shaft seat, and the shaft seat is rotationally connected with the upright post.

The steering seat is provided with a hole for arranging a bolt so as to enable the crane to be relatively fixed with the steering seat when the crane is transversely arranged and vertically arranged, and the automobile is provided with a power switch so as to start and stop the motor.

By adopting the truck crane, the mounting frame is provided with the shaft seat, the crane is connected with the shaft seat, and the crane can rotate on a vehicle; because the shaft seat is connected with the steering seat, the crane boom can be wholly and transversely folded on the automobile after being folded to lean against the upright post, and the crane boom is convenient to use, time-saving and labor-saving; meanwhile, the crane is provided with a weight limit protection mechanism to prevent the automobile from being damaged due to overload during hoisting, and the truck crane has a simple structure, and is attractive and light.

Preferably, the mounting frame is provided with support legs for stabilizing the whole structure.

Preferably, the supporting leg comprises a supporting frame, the supporting frame is connected with an inclined supporting rod, the inclined supporting rod is connected with a spherical hinge support, the spherical hinge support is detachably connected with a rocker, and the rocker is used for adjusting the distance between the spherical hinge support and the ground.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. by applying the weight limit protection mechanism, when a crane is lifted, the weight limit set by the weight limit protection mechanism is exceeded, the stress of a lifting rope is transmitted to the elastic support component, the elastic support component is compressed, the pulley shaft moves and touches the limit switch, the limit switch cuts off the power of the motor, so that the crane stops lifting, the structure of the crane is protected from overload damage, after the overload of the lifting rope is relieved, the elastic support component resets and jacks the pulley shaft, the shaft is relieved from the contact with the limit switch, the limit switch resets and powers on the motor, and the crane recovers the working state;

2. by applying the weight limit protection mechanism, the weight limit protection mechanism also comprises a connecting part, the connecting part is arranged on the crane, the connecting part supports the shaft, the connecting part is contacted with the elastic support component, the shaft and the elastic support component are connected through the connecting part by adopting the structure, the problem of mutual arrangement positions of the shaft and the elastic support component is solved, the structure of the crane is optimized, and the connecting part can be used as a force arm to amplify the pretightening force of the elastic support component, so that the bearing safety performance of the crane is greatly improved;

3. when the crane is used for lifting, the weight limit set by the weight limit protection mechanism is exceeded, the stress of the lifting rope is transmitted to the elastic support component and the elastic support component is compressed, the pulley shaft moves and touches the limit switch, the limit switch cuts off the power of the motor, so that the crane stops lifting, the structure of the crane is protected from overload damage, after the lifting rope is relieved from overload, the elastic support component resets and jacks the pulley shaft, the shaft is relieved from contacting with the limit switch, the limit switch resets and energizes the motor, and the crane restores to the working state;

4. when the crane is in a storage state, the motor drives the winch to rotate forwards, the winch winds the lifting rope, the lifting rope pulls and finally tightens the lifting hook, then the lifting rope pulls the supporting arm to move upwards, the supporting arm moves in the clamping groove, and after the supporting arm is connected with one clamping port, the crane is in a working state capable of being lifted; after the connection between the supporting arm and the clamping interface is released, the motor drives the winch to rotate reversely, the supporting arm moves downwards, the suspension arm is folded towards the stand column, and the crane returns to the storage state;

5. by using the truck crane, the mounting frame is provided with the shaft seat, the crane is connected with the shaft seat, and the crane can rotate on a vehicle; because the shaft seat is connected with the steering seat, the crane boom can be wholly and transversely folded on the automobile after being folded to lean against the upright post, and the crane boom is convenient to use, time-saving and labor-saving; meanwhile, the crane is provided with a weight limit protection mechanism to prevent the automobile from being damaged due to overload during hoisting, and the truck crane has a simple structure, and is attractive and light.

Drawings

FIG. 1 is a schematic structural view of a weight limit protection mechanism of a crane according to the present invention;

FIG. 2 is another schematic structural diagram of the weight limit protection mechanism of the crane according to the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view of the crane and its structure mounted on a vehicle according to the present invention;

FIG. 5 is a cross-sectional view B-B of FIG. 4;

FIG. 6 is a schematic view of the boom of FIG. 4 being stowed;

fig. 7 is a schematic view of the column of fig. 6 being received.

The labels in the figure are: 100-guide groove, 101-pulley, 102-shaft, 110-lifting rope, 120-weight limiting component, 121-elastic supporting component, 122-adjusting component, 130-limit switch, 140-connecting component, 200-upright post, 201-lifting arm, 202-supporting arm, 203-clamping groove, 210-winch, 211-motor, 220-lifting hook, 230-shaft seat, 231-positioning handle, 232-positioning pin, 233-positioning hole, 300-mounting frame, 301-steering seat, 302-bolt, 310-supporting frame, 311-diagonal brace, 312-spherical hinge support, 313-rocker and 320-power switch.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.