CN215287734U - Crane no-load operation safety protection device - Google Patents

Abstract

The utility model discloses a safety protection device for the no-load operation of a crane, which comprises a fixed seat, a shaft bracket, a pulley block, a shaft sensor, a transformer, a power supply and a control system; the fixed seats are arranged on two sides at intervals, the pulley blocks are arranged on the shaft bracket, and shaft sensors for acquiring stress of the shaft bracket are arranged between the two sides of the shaft bracket and the upper parts of the fixed seats; after the crane is provided with the no-load protection device, when the crane runs in no-load, a main power supply is automatically cut off to stop when a lifting hook or a lifting appliance collides with (mistakenly hangs on) an object of which the weight is less than or equal to 20-100 kg, a driver restarts a lifting control button and can continue to move forward only by recovering the action in the opposite direction to be less than a set weight, when the crane normally lifts the object, a conversion button is rotated to a normal working state to normally lift the goods or normally lift the goods under the combined action of auxiliary facilities, and the crane works under the control protection of the no-load protection device at other times (states).

Description

Crane no-load operation safety protection device

Technical Field

The utility model belongs to the technical field of the hoist, concretely relates to empty load operation safety arrangement of hoist.

Background

In actual production operation, when the existing crane is installed and used, in order to prevent safety production accidents caused by overload, lifting and descending overrun and stroke overrun, a main lifting overload protection device, a main lifting and descending protection device and a large and small vehicle operation protection device are installed, but no crane no-load operation protection is considered, and lifting injury accidents (events) caused by mistakenly hanging other objects by a lifting hook or a lifting appliance often occur.

At present, because a driver of the air operation is in a working state for a long time till the driver is in mental fatigue, after the unloading of heavy objects is finished, the pressure in the process of returning to the original no-load way is reduced, the running speed is increased, and the lifting hook or the lifting appliance is accidentally collided with the objects or the personnel to cause serious accidents. The existing crane is operated by remote control, the distance between the remote controllers is less than 100 meters, an operator can walk in front of the crane when the crane runs in a no-load mode, the crane running behind the crane can collide or hang other objects, even the operator stands within 20-100m of the distance from the crane position by using the remote controllers and waits for the no-load crane to return to the side of the operator, even the remote controllers are placed into a pocket to collide with a button unintentionally, so that the crane works automatically, and the safety coefficient is low; based on this, it is necessary to research a safety protection device for the no-load operation of the crane.

Disclosure of Invention

Defect and problem to existing equipment existence, the utility model provides a hoist no-load operation safety arrangement, effectual lifting hook or the hoist mistake that exist among the existing equipment of having solved hang other object after equipment continuation operation, cause the problem of incident easily.

The utility model provides a scheme that its technical problem adopted is: a safety protection device for the no-load operation of a crane comprises a fixed seat, a shaft bracket, a pulley block, a shaft sensor, a transformer, a power supply and a control system; the fixed seats are arranged on two sides at intervals, the pulley blocks are arranged on the shaft bracket, and shaft sensors for acquiring stress of the shaft bracket are arranged between the two sides of the shaft bracket and the upper parts of the fixed seats; the control system comprises an instrument, a converter, a digital quantity control display, a relay, an electric lock, a change-over switch and a main contactor; the shaft sensor uploads the stress information to the instrument, the instrument is connected with the digital quantity control display through the converter, and the signal output end of the digital quantity control display is connected with the relay to control the on-off of the relay; the electric lock is connected in series in proper order has function switch, power, conversion module and total contactor, the conversion module includes change over switch, relay and auxiliary switch, change over switch is the two switches of single-pole, and its two branches are connected with relay and auxiliary switch respectively, then establish ties on total contactor.

Furthermore, the shaft bracket comprises connecting plates and connecting rods, the two connecting plates are arranged at intervals, the connecting rods transversely penetrate through and are fixed on the upper portions of the two connecting plates, and a rotating shaft of the pulley block is rotatably arranged on the lower portions of the two connecting plates.

Furthermore, the function switch comprises a starting switch, a power supply, an emergency stop switch and a stop switch, and the electric lock is sequentially connected with the starting switch, the power supply, the emergency stop switch, the conversion module and the main contactor in series.

Further, the shaft sensor is a pin shaft sensor.

Further, the upper parts of the fixing seats on the two sides are provided with shaft sensors respectively, and stress information of the bearings or the shaft sleeves on the two sides is collected respectively.

Furthermore, the shaft sensor is a fixed pulley type sensor, and two exposed ends of the connecting rod are located in an arc-shaped collecting part of the pulley type sensor.

The utility model has the advantages that: the utility model discloses equipment continues the operation behind other objects is hung to lifting hook or hoist mistake to existence among the current structure, leads to serious incident, based on this, the utility model discloses set up the axle sensor on the fixing base, the axle sensor can be gathered the atress of pedestal, after the atress reaches the predetermined value, can automatic cutout power park. In order to achieve the above object, the utility model provides a two kinds of sensors are used for gathering the pulling force that the shaft receives, and axle sensor can be for round pin axle type sensor or fixed pulley type sensor promptly.

After the crane is provided with the no-load protection device, when the lifting hook or the lifting appliance runs in no-load operation and hits (or obliquely pulls) an object with the weight of less than or equal to 20-100 kilograms (the weight can be automatically set), the main power supply is automatically cut off to stop, and a driver restarts the lifting control button, so that the driver can continue to move forward only after the reverse direction action is recovered to a safe state less than the set weight. When the crane normally lifts objects, the conversion button is rotated to a normal working state to normally lift the goods or the goods can be normally lifted under the combined action of auxiliary facilities (a foot pedal switch is added during idle operation or another group of auxiliary buttons is pressed during remote control operation), and the no-load protection device works at other times.

From this, the utility model discloses have two kinds of operating condition, handling operating mode and no-load return operating mode promptly, two operating modes are switched two kinds of operating modes through conversion module. In the dispatching working condition, the shaft sensor is off-line, so that the pulley block can be hoisted; under the no-load return working condition, the shaft sensor is put into operation, when a lifting hook or a lifting rope on the pulley block collides with an obstacle, the crane walks to generate tension, so that the two end parts of the shaft bracket press the acquisition part of the shaft sensor, the shaft sensor detects the force, when a set value is reached, the shaft sensor uploads stress information, and finally the relay is controlled to disconnect a loop, so that the main contactor is powered off, safety is ensured, and the no-load operation safety protection device for the crane, which is novel in structure and safe to use, is provided for people.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a schematic structural diagram of the fixed pulley type sensor.

Fig. 4 is a schematic structural diagram of the pin-type sensor.

Fig. 5 is a schematic diagram of the control system.

The reference numbers in the figures are: the device comprises a fixed seat 1, a connecting plate 2, a connecting rod 3, a pulley block 4, a wheel shaft 5, a wheel sensor 6, a meter 7, a converter 8, a digital quantity control display 9, a relay 10, a power supply 11, a transformer 12, an electric lock 13, a starting switch 14, a power supply 15, an emergency stop switch 16, a stop switch 17, a change-over switch 18, an auxiliary switch 19 and a main contactor 20.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1: this embodiment aims at providing a hoist idle running safety arrangement, mainly used hoist's safety protection, after hanging other objects to lifting hook or hoist mistake that exist among the current structure, equipment can continue to operate, leads to serious incident, based on this hoist idle running safety arrangement.

As shown in fig. 1-2, a safety protection device for the no-load operation of a crane comprises a fixed seat 1, a connecting plate 2, a connecting rod 3, a pulley block 4, a wheel shaft 5 and a shaft sensor 6; the upper end of connecting plate 2 is provided with the fixed orifices, 3 suits of connecting rod form the pedestal structure in the fixed orifices, 2 intervals of connecting plate are provided with two, connecting rod 3 is along transversely running through the upper portion of fixing at two connecting plates 2, the pivot of assembly pulley 4 is rotated and is set up the lower part at two connecting plates 2, and be provided with the axle sensor 6 that is used for gathering the pedestal atress between the both sides of pedestal and the upper portion of fixing base 1, the fixing base is as fixed basis, the upper portion of both sides fixing base all is provided with the axle sensor, and gather the atress information of both sides pedestal respectively.

The axis sensor 6 in this embodiment is a fixed pulley type sensor; the fixing base 1 is arranged on two sides at intervals, the fixed pulley type sensor is fixed on the fixing base 1, the arc-shaped collecting part on the upper portion of the fixed pulley type sensor faces upwards and corresponds to two exposed ends of the connecting rod, the two exposed ends of the connecting rod 3 are located in the arc-shaped collecting part of the pulley type sensor during assembly, and when the shaft frame is stressed, the arc-shaped collecting part accurately collects tension force borne by the shaft frame.

In the embodiment, the device further comprises a control system, a transformer 12 and a power supply 11, wherein the power supply 11 supplies power to the control system through the transformer 12, and the control system comprises an instrument 7, a converter 8, a digital quantity control display 9, a relay 10, an electric lock 13, a conversion module and a main contactor 20; as shown in fig. 5, the shaft sensor 6 uploads the stress information to the meter 7, the meter 7 displays a specific numerical value, the meter 7 is connected with the digital quantity control display 9 through the converter 8, the digital quantity control display 9 is used for modifying and setting a threshold value, a signal output end of the digital quantity control display 9 is connected with the relay 10, and the relay 10 is controlled to be switched on or off.

In a specific embodiment, the electric lock 13 is sequentially connected in series with a function switch, a power supply 15, a conversion module and a main contactor 20, the function switch includes a start switch 14, a power supply 15, an emergency stop switch 16 and a stop switch 17, the electric lock 13 is sequentially connected in series with the start switch 14, the power supply 15, the emergency stop switch 16, the stop switch 17, the conversion module and the main contactor 20, wherein the start switch 14 is used for starting equipment to operate, the emergency stop switch 16 is used for emergency stop, the power supply 15 is used for supplying power to a circuit, the stop switch 17 is used for stopping the equipment, the conversion module includes a conversion switch 18, a relay 10 and an auxiliary switch 19, the conversion switch 18 is a single-pole double-branch switch, and two branches of the conversion switch are respectively connected with the relay 10 and the auxiliary switch 19 and then connected in series to the main contactor 20.

When the device works, the device has two working states, namely a hoisting working condition and an idle load return working condition, the two working conditions are switched by the change-over switch, and in the dispatching working condition, the shaft sensor is off-line and is communicated with the auxiliary switch loop, so that the pulley block can be hoisted; under the no-load return working condition, the relay loop is switched to through the change-over switch, the shaft sensor is put into operation, when a lifting hook or a lifting rope on the pulley block collides with an obstacle, the crane travels to generate pulling force and transmits the pulling force to the shaft bracket, the force is detected by the shaft sensor, when a set value is reached, the shaft sensor uploads stress information and finally controls the relay to disconnect the loop, the main contactor is powered off, safety is ensured, and the crane no-load operation safety protection device which is novel in structure and safe to use is provided for people.

In the embodiment, after the no-load protection device is arranged on the crane, when the lifting hook or the lifting appliance hits (or is obliquely hung) an object with the weight less than or equal to 20-100 kg (the weight can be automatically set) in the no-load operation, the main power supply is automatically cut off to stop, a driver restarts the lifting control button, the driver can only continue to move forward after the reverse direction action is recovered to a safe state less than the set weight, when the object is normally lifted by the crane, the change-over switch is rotated to a normal lifting working state, the goods can be normally transported or can be normally transported under the combined action of auxiliary facilities (a foot pedal switch is added in the air operation or another group of auxiliary buttons is pressed in the remote control operation), and the no-load protection device works in other time.

Example 2: this example is substantially the same as example 1, except that: the present embodiment provides an axis sensor of another structure.

As shown in fig. 3, the axis sensor is a pin axis sensor, the pin axis sensor is fixed on two sides of the axis frame and is located on the fixed seat, the model of the pin axis sensor is a ZX type pin axis sensor, which mainly replaces the axes of the balance pulley and the fixed pulley or other types of pin axes, and is commonly used for hoisting equipment such as a hoist, a port machine and a chain block, and occasions where other types of sensors cannot be installed.

Claims (6)

1. The utility model provides a hoist no-load operation safety arrangement which characterized in that: comprises a fixed seat, a shaft bracket, a pulley block, a shaft sensor, a transformer, a power supply and a control system; the fixed seats are arranged on two sides at intervals, the pulley blocks are arranged on the shaft bracket, and shaft sensors for acquiring stress of the shaft bracket are arranged between the two sides of the shaft bracket and the upper parts of the fixed seats; the control system comprises an instrument, a converter, a digital quantity control display, a relay, an electric lock, a change-over switch and a main contactor; the shaft sensor uploads the stress information to the instrument, the instrument is connected with the digital quantity control display through the converter, and the signal output end of the digital quantity control display is connected with the relay to control the on-off of the relay; the electric lock is connected in series in proper order has function switch, power, conversion module and total contactor, the conversion module includes change over switch, relay and auxiliary switch, change over switch is the two switches of single-pole, and its two branches are connected with relay and auxiliary switch respectively, then establish ties on total contactor.

2. The crane no-load operation safety protection device as claimed in claim 1, wherein: the shaft bracket comprises connecting plates and connecting rods, the two connecting plates are arranged at intervals, the connecting rods penetrate through and are fixed on the upper portions of the two connecting plates in the transverse direction, and a rotating shaft of the pulley block is rotatably arranged on the lower portions of the two connecting plates.

3. The crane no-load operation safety protection device as claimed in claim 2, wherein: the shaft sensor is a fixed pulley type sensor, and two exposed ends of the connecting rod are located in an arc-shaped collecting part of the pulley type sensor.

4. The crane no-load operation safety protection device as claimed in claim 1, wherein: the functional switch comprises a starting switch, a power supply, an emergency stop switch and a stop switch, and the electric lock is sequentially connected with the starting switch, the power supply, the emergency stop switch, the conversion module and the main contactor in series.

5. The crane no-load operation safety protection device as claimed in claim 1, wherein: the shaft sensor is a pin shaft sensor.

6. The crane no-load operation safety protection device as claimed in claim 1, wherein: the upper parts of the fixing seats on the two sides are provided with shaft sensors respectively, and stress information of the bearings or the shaft sleeves on the two sides is collected respectively.

Images