CN212334462U - Safety control device for preventing load from falling for variable-frequency speed-regulating lifting mechanism - Google Patents

Abstract

The utility model discloses a safety control device for preventing load from falling for a variable frequency speed-regulating lifting mechanism, which is characterized in that a code disc is fixed at one end of a winding drum, an adjustable bracket is fixed on a frame of the winding drum in front of the code disc, the adjustable bracket is provided with a long hole with sawtooth at the upper and lower sides, the two proximity switches are arranged in the long hole, the both ends in rectangular hole are equipped with one set of fixed snap ring and the hasp of mutually supporting respectively, and the upper and lower hole distance in rectangular hole can be reduced in hasp and the cooperation of fixed snap ring, and two proximity switch connect the signal of carrying and give the controller, and controller connection control promotes motor, brake disc, the utility model has the characteristics of automated inspection hoist mechanism traffic direction, combine together, according to actual conditions automatic control motor stop with band-type brake, effectively prevent to lead to the load to fall because of the converter current-limiting with the controller of control hoist motor forward and reverse operation.

Description

Safety control device for preventing load from falling for variable-frequency speed-regulating lifting mechanism

Technical Field

The utility model belongs to the technical field of vertical lift machinery safety device, especially, relate to a safety control device that is arranged in frequency conversion hoist mechanism to prevent load from falling.

Background

The lifting mechanism of construction machinery equipment such as construction elevators, tower cranes, mixing plant hoists and the like is increasingly widely applied to variable frequency speed regulation, and one problem always exists in the application of variable frequency speed regulation: load when suddenly increasing, hoist mechanism meets external resistance because of load trouble or motor trouble or promotion guide rail promptly, leads to the converter to appear current-limiting protection, and the output moment of torsion of converter can not increase again because of the restriction of electric current this moment, and the load moment of torsion is increasing again, must lead to the load because the lifting moment is not enough and the whereabouts, causes the incident. At present, no effective measure is available for the application of frequency conversion and lifting open loop in the industry to solve the problem.

Disclosure of Invention

An object of the utility model is to improve prior art not enough and provide an automatic detect hoist mechanism traffic direction, combine together, according to actual conditions automatic control motor stop with the band-type brake, effectively prevent to lead to the load to fall because of the converter current-limiting be used for frequency conversion hoist mechanism to prevent the safety control device that the load falls with the controller of control hoist motor forward and reverse operation.

The utility model aims at realizing like this, a safety control device that is used for variable frequency speed governing hoist mechanism to prevent load from falling, including promoting the motor, the hoist cylinder, the brake disc, its characteristics are fixed with the code wheel in the one end of hoist cylinder, be fixed with adjustable support in the frame of the hoist cylinder before the code wheel, both sides are the rectangular hole of sawtooth about opening on the adjustable support, two proximity switches install in the rectangular hole, the both ends in rectangular hole are equipped with one set of fixed snap ring and the hasp of mutually supporting respectively, the last hole pitch down in rectangular hole can be reduced in hasp and the cooperation of fixed snap ring, two proximity switches connect and carry the signal to give the controller, controller connection control promotes the motor, the brake disc.

Compared with the prior art, the utility model has the following characteristics of showing and positive effect: the utility model adopts two proximity switches as the running direction acquisition sensor of the hoisting roller, the controller judges the actual positive rotation or reverse rotation of the motor hoisting roller through the received switch-on sequence of the two proximity switches, once the switch-on sequence of the proximity switches is detected to be out of order, the controller can automatically output an emergency braking instruction to power off, the motor brake disc brakes the band-type brake in emergency power-off, simultaneously, the motor is promoted to power off, and the load is ensured not to fall down; the two proximity switches are arranged in the long holes, so that the proximity switches can move up, down, left and right to ensure that the distance between the proximity switches and the coded disc is adjusted to be within the proximity switch induction range; the lock catch is matched with the fixed clamp ring, so that the upper and lower hole distances of the strip hole can be reduced, the proximity switch can be clamped, the proximity switch is firmly installed, and the looseness and failure are avoided; the utility model discloses the emergence of incident is prevented in the falling of load when can effectual assurance converter current-limiting.

Drawings

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

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is a sectional view B-B of fig. 2.

Fig. 4 is a control schematic diagram of the present invention.

In the figure: 1. the device comprises a first proximity switch, a second proximity switch, a coded disc, a winding roller, a brake disc, a lifting motor, a controller, a lock catch, an adjustable support, a long hole, a fixing clamp ring and a controller, wherein the first proximity switch is 2, the second proximity switch is 3, the coded disc is 4, the winding roller is 5, the brake disc is 6, the lifting motor is 7, the controller is 8, the lock catch is 9, the adjustable support is 10.

Detailed Description

A safety control device for preventing load from falling in a frequency conversion lifting mechanism, referring to fig. 1, fig. 2, fig. 3 and fig. 4, a lifting motor 6, a winding roller 4, a brake disc 5 and a controller 7 are connected according to a conventional mode, a code disc 3 is fixed at one end of the winding roller 4, an adjustable bracket 9 is fixed on a rack of the winding roller 4 in front of the code disc 3, a strip hole 10 is opened on the adjustable bracket 9, the upper and lower sides of the strip hole 10 are in a sawtooth shape, a first proximity switch 1 and a second proximity switch 2 are installed in the strip hole 10, the first proximity switch 1 and the second proximity switch 2 can move up and down and left and right in the strip hole 10 to ensure that the distance between the two proximity switches and the code disc 3 is adjusted to be within the proximity switch sensing range, a set of a fixed snap ring 11 and a fixed snap ring 8 which are matched with each other are respectively arranged at the two ends of the strip hole 10, the snap ring 8 and the fixed snap ring 11 are matched to reduce the distance between the upper, through the fixed snap ring 11 of adjustable support 9 and the upper and lower interval of hasp 8 reduction rectangular hole 10, the sawtooth card on the upper and lower both sides of messenger rectangular hole 10 goes into proximity switch outer wall screw thread, with first proximity switch 1, second proximity switch 2 presss from both sides tightly fixedly, guarantee not to become flexible inefficacy, first proximity switch 1, second proximity switch 2 is connected and is carried signal for controller 7, controller 7 connection control promotes motor 6, brake disc 5, first proximity switch 1 in this embodiment, second proximity switch 2 connects the input X1 end of controller 7 respectively, X2 end, other terminals of controller 7 are connected with other equipment according to conventional mode.

The utility model discloses a first proximity switch 1, second proximity switch 2 regard as the operation direction acquisition sensor of hoist cylinder 4, and code wheel 3 rotates along with motor hoist cylinder 4, and controller 7 judges the actual corotation or the reversal of hoist cylinder 4 through two proximity switch's switch-on order. As shown in fig. 4, when the X3 end of the controller 7 receives a lifting command signal, the controller 7 pulls in the lifting control relay Y1, the relay Y1 drives the contactor KA1 to pull in, the contactor KA1 drives the variable frequency output U, V, W, the driving motor 6 rotates forward and lifts, meanwhile, the braking relay Y0 of the controller 7 pulls in, the relay Y0 drives the contactor KA0 to pull in, the contactor KA0 drives the brake disc 5 to be powered on and off, at this time, the controller 7 detects the working timing a-AB-B of the first proximity switch 1 and the second proximity switch 2, and the corresponding controller 7 is X1-X1X2-X2, which is forward lifting logic. The controller 7 detects in real time that the actual steering of the winch drum 4 fed back by the two proximity switches is positive rotation lifting logic, and the controller 7 inputs instructions for positive rotation lifting, so that the direction is consistent and the normal operation is realized. If the lifting mechanism meets external resistance due to load failure or motor failure or lifting guide rails at the moment, the frequency converter is subjected to current limiting protection, the output torque of the frequency converter cannot be increased due to the limitation of current at the moment, the load torque is increased, the load is inevitably reduced in a reverse rotation manner due to insufficient lifting torque, the controller 7 detects the working time sequence B-BA-A of the first proximity switch 1 and the second proximity switch 2 in real time at the moment, the corresponding controller 7 is X2-X2X1-X1, the logic is reverse rotation reduction logic, the controller 7 is a forward rotation lifting input instruction, the directions are inconsistent at the moment, the controller 7 outputs an emergency braking instruction Y0 for power failure, the motor brake disc 5 emergently cuts off the brake, the lifting motor 6 is simultaneously cut off the power, and the load is ensured not to fall down. The utility model discloses the emergence of incident is prevented in the falling of load when can effectual assurance converter current-limiting.

Claims (1)

1. The utility model provides a safety control device that is used for variable frequency speed governing hoist mechanism to prevent load from falling, including the hoist motor, the hoist cylinder, brake disc and controller, characterized by is fixed with the code wheel in the one end of hoist cylinder, be fixed with adjustable bracket in the frame of hoist cylinder before the code wheel, it has the rectangular hole that both sides are the sawtooth to open on the adjustable bracket, two proximity switches install in the rectangular hole, the both ends in rectangular hole are equipped with one set of fixed snap ring and the hasp of mutually supporting respectively, the upper and lower hole distance in rectangular hole can be reduced in hasp and the cooperation of fixed snap ring, two proximity switches connect the conveyor signal and give the controller, controller connection control promotes the motor, the brake disc.

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