CN105253778A - Moment limiter capable of automatically controlling overload warning to be relieved - Google Patents

Abstract

The invention relates to a torque limiter for automatic control of overload alarm release, comprising a hydraulic reversing valve, a guide rod, a position sensor, a position baffle, and a control host; the hydraulic reversing valve is connected with lifting equipment to control the movement of the lifting equipment direction; the position baffle is installed on the safety operating handle, and can move along with the safety operating handle along the guide rod; the position sensor is installed above the position baffle, and the signal output end of the position sensor is connected with the control host for monitoring the position baffle The position of the board and send a trigger signal to the control host; the control host releases the overload alarm signal according to the trigger signal sent by the position sensor. The invention not only has the function of automatically releasing the alarm, but also can effectively protect the safety of the lifting equipment, and can be widely used in the field of engineering lifting equipment.

Description

Torque limiter for automatic control release of overload alarm

technical field

The invention relates to the field of engineering technology, in particular to a torque limiter for automatic control release of overload alarm.

Background technique

Cranes play a very important role in engineering construction and accident rescue. When using a crane for lifting operations, it is necessary to frequently change the working conditions for lifting operations according to the site conditions, such as changing the lifting angle, etc., and under different working conditions The working amplitude and maximum rated load of hoisting are different, so a set of safety device is required to comprehensively monitor and judge the above parameters, and display the working status of the crane in real time, such as normal operation, full load, overload, upper limit of amplitude, and lower limit of amplitude, etc. And carry out corresponding alarm, reminder and control to ensure the safe operation of the crane. For this reason, the crane is equipped with a moment limiter as a safety protection device. According to the actual working state of the crane and according to the specific load curve, the moment limiter is automatically imposed on the crane to prevent dangerous movements of the crane. Therefore, the torque limiter product is an indispensable safety protection device on the lifting machinery.

The existing torque limiters are equipped with overload alarm protection devices. When an overload alarm occurs on the lifting equipment, the operator needs to manually operate to release the overload alarm, so as to achieve safe work. However, there are many possibilities for manual operation. If the operator makes mistakes, it is easy to cause the lifting equipment to continue to move in a dangerous direction and cause a safety accident. In view of the important safety function of the torque limiter, it is very important to develop a torque limiter that can automatically control and release the overload alarm.

Contents of the invention

The present invention overcomes the shortcomings of the prior art that the torque limiter needs to manually release the overload alarm, and provides a torque limiter that automatically controls the release of the overload alarm.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a torque limiter for automatic control of overload alarm release, including a hydraulic reversing valve, a guide rod, a position sensor, a position baffle, and a control host; the hydraulic reversing The valve is connected with the lifting equipment to control the action direction of the lifting equipment; the position baffle is installed on the safety operation handle and can move along the guide rod with the safety operation handle. The safety operation handle is the The hydraulic reversing valve controls the corresponding hydraulic reversing valve operating handle when the lifting equipment moves in the direction of torque reduction, and the operating handle moves in the corresponding direction with the hydraulic reversing valve; the position sensor is installed at the position Above the baffle, the signal output end of the position sensor is connected with the control host for monitoring the position of the position baffle and sending a trigger signal to the control host; When running in the small direction, the control host cancels the overload alarm signal according to the trigger signal sent by the position sensor.

The torque limiter that automatically controls the release of the overload alarm also includes an electro-hydraulic protection valve, the electro-hydraulic protection valve is installed on the hydraulic reversing valve, and the electro-hydraulic protection valve is used to prohibit The hydraulic directional valve operates.

When the control host outputs an overload alarm signal, the electro-hydraulic protection valve starts; when the control host releases the overload alarm signal, the electro-hydraulic protection valve starts and stops.

The torque limiter for automatic control release of overload alarm further includes an elastic device, the movable end of which is connected to the position baffle, and is used to reset the position baffle.

The invention adopts a mechanical mechanism combined with an electrical sensor to realize mechanism movement and state monitoring and control. Compared with the prior art, it not only has the function of automatically disabling the alarm, but also effectively protects the safety of the lifting equipment.

Description of drawings

Fig. 1 is the mechanical structural diagram of the torque limiter that the overload alarm automatic control of the present invention is released;

Fig. 2 is a schematic diagram of the circuit connection of the torque limiter with overload alarm automatic control release in the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to Fig. 1-2, a torque limiter with overload alarm and automatic control release includes hydraulic reversing valve 1, electro-hydraulic protection valve 2, control host 3, position baffle 4, position sensor 5, guide rod 6, Among them, the hydraulic reversing valve 1 can control the movement of the lifting equipment in two directions of torque reduction or torque increase; To the end of the safety operation handle 7 of the valve 1, when the controlled lifting equipment moves in the safe direction of torque reduction, the safety operation handle 7 will move in the corresponding direction, and drive the position baffle 4 to move along the guide rod 6 The position sensor 5 is installed above the position baffle 4 by the base plate 51, and the signal output end of the position sensor 5 is connected with the control host 3 through the data transmission port 9, and is used to send signals to the control host 3 according to the position of the position baffle 4; As shown in Figure 2, the electro-hydraulic protection valve 2 is installed on the hydraulic reversing valve 1, and its signal input terminal is connected to the control host 3 through the data transmission port 9, which is used to receive the overload alarm signal sent by the control host 3 and prohibit the hydraulic reversing valve. Run to valve 1.

In addition, the moment limiter of the overload alarm automatic control release of the present invention also includes a spring 8, as shown in Figure 1, the spring 8 is fixed on the base plate 51 of the position sensor 5, and its movable end is connected with the position stopper 4, when the position stopper When the plate 4 moves along the guide rod 6, the spring 8 will be deformed. After the movement of the lifting equipment is over, the safety operation handle 7 will be reset, and the position baffle 4 will move along the guide rod 6 to reset. Spring 8 wherein also can be replaced by other elastic devices.

The movement direction of the lifting equipment is realized by controlling the corresponding hydraulic reversing valve. When the hydraulic reversing valve 1 works, the corresponding operating handle will move in a certain direction. When the action of the lifting equipment controlled by the hydraulic reversing valve 1 is to move in the safe direction of torque reduction, the safety operation handle 7 will drive the position baffle 4 to move along the guide rod 6, and the position baffle 4 triggers the The position sensor 5, the position sensor 5 is triggered, and sends a trigger signal to the torque limiter control host 3; the torque limiter control host 3 will process the signal according to the working status of the lifting equipment: if the lifting equipment is not overloaded, the torque limit The controller control host 3 will not do any processing; if the lifting equipment is overloaded, the control host 3 will send an overload alarm signal, and the electro-hydraulic protection valve 9 will be activated, so that the hydraulic reversing valve 1 is in a state of prohibiting operation. 5, the torque limiter control host 3 will automatically release the alarm limiter, the electro-hydraulic protection valve 9 will start and stop, and the hydraulic reversing valve 1 will resume the motion control of the lifting equipment, so that the lifting equipment can continue to torque. In addition, if the lifting equipment is overloaded, and the hydraulic reversing valve 1 controls the lifting equipment to run in the dangerous direction of torque increase, the position sensor 5 will not be triggered, so the alarm limit state will not be released , because the electro-hydraulic protection valve 9 is still activated, the hoisting equipment will not move with the control action. Therefore, this device has not only played the function of automatically disabling the alarm, but also effectively protects the safety of the hoisting equipment.

The torque limiter for overload alarm automatic control release of the present invention adopts a mechanical mechanism combined with an electrical sensor to realize mechanism movement and state monitoring and control. When moving, the alarm control loop can be automatically interrupted. When the lifting equipment moves in a dangerous direction, the torque limiter will maintain the alarm control state, so that the lifting equipment cannot move, ensuring that the equipment can only move in a safe direction under the overload alarm state , to avoid safety accidents in which the equipment continues to move in a dangerous direction due to operating errors by the operator.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the scope of knowledge of those of ordinary skill in the art, various modifications can be made without departing from the gist of the present invention. kind of change.

Claims (4)

1. The torque limiter for overload alarm automatic control release is characterized in that it includes a hydraulic reversing valve, a guide rod, a position sensor, a position baffle, and a control host; The hydraulic reversing valve is connected with the lifting equipment to control the action direction of the lifting equipment; The position baffle is installed on the safety operating handle and can move along with the safety operating handle along the guide rod. The safety operating handle is used by the hydraulic reversing valve to control the lifting equipment to move in the direction of torque reduction. The corresponding hydraulic reversing valve operating handle, the operating handle moves in the corresponding direction along with the hydraulic reversing valve; The position sensor is installed above the position baffle, and the signal output end of the position sensor is connected to the control host for monitoring the position of the position baffle and sending a trigger signal to the control host; When the lifting device is in an overloaded state and runs in the direction of torque reduction, the control host cancels the overload alarm signal according to the trigger signal sent by the position sensor. 2. The torque limiter for overload alarm automatic control release according to claim 1, characterized in that it also includes an electro-hydraulic protection valve, the electro-hydraulic protection valve is installed on the hydraulic reversing valve, and the electro-hydraulic protection valve The protection valve is used to prohibit the operation of the hydraulic reversing valve when the lifting equipment is overloaded. 3. The torque limiter for overload alarm automatic control release according to claim 2, characterized in that, when the control host outputs an overload alarm signal, the electro-hydraulic protection valve starts; when the control host releases the overload alarm signal, the electro-hydraulic protection valve starts and stops. 4. The torque limiter for overload alarm automatic control release according to claim 1, further comprising an elastic device, the movable end of the elastic device is connected with the position baffle for making the position baffle Board reset.