CN210680649U

CN210680649U - Forklift overturn-preventing device

Info

Publication number: CN210680649U
Application number: CN201920757032.4U
Authority: CN
Inventors: 王庆宪
Original assignee: Baoding Xinhua Petrochemical Equipment Manufacturing Co ltd
Current assignee: Baoding Xinhua Petrochemical Equipment Manufacturing Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-06-05
Anticipated expiration: 2029-05-15

Abstract

The utility model provides a fork truck anti-overturning device, installs 2 single-action pneumatic cylinders in the both sides at fork truck frame center, and the piston rod of pneumatic cylinder withstands the bogie, and the oil circuit of 2 pneumatic cylinders passes through a normally open solenoid valve UNICOM. And the forklift is also provided with a single chip microcomputer control system and 2 sensors. When the single chip microcomputer calculates that the turning speed of the vehicle is too high, the power module drives the electromagnetic valve to work to close the oil way, and a piston rod of a hydraulic cylinder which props against the bogie cannot retract, so that the vehicle frame cannot incline, the gravity center offset of the vehicle is reduced, and the anti-overturning capacity of the vehicle is improved.

Description

Forklift overturn-preventing device

The technical field is as follows:

the invention relates to an anti-overturning device, in particular to an anti-overturning device for a balance weight type forklift.

Background art:

in order to adapt to work on uneven ground, a frame usually adopts a 3-point supporting mode, and the rear part of the frame is hinged with a longitudinal supporting shaft in the middle of a bogie; the counter weight is installed on the frame for the counter weight is far away from the longitudinal support shaft of bogie for the vehicle focus is higher. When the forklift turns, the frame inclines towards the outer side under the action of centrifugal force, so that the counterweight position moves to the outer side of the central line of the forklift. The faster the turning speed, the greater the centrifugal force, the greater the weight offset, and the vehicle will overturn when the center of gravity of the vehicle exceeds the supporting tires.

The invention content is as follows:

in order to solve the defects in the prior art, the invention adopts the technical scheme that: the warning device is composed of a sensor, a singlechip control system, a warning device, 2 hydraulic cylinders arranged on a frame, a hydraulic pipeline communicated with the 2 hydraulic cylinders and a normally open electromagnetic valve. 2 pneumatic cylinders are installed on the frame, and the piston rod top of pneumatic cylinder is on the bogie, and the hydraulic line of 2 pneumatic cylinders communicates through a normally open solenoid valve, when the singlechip calculated that fork truck has the danger of toppling, the work of drive normally open solenoid valve cuts off hydraulic line's oil circuit. A stroke sensor is arranged between a steering hydraulic cylinder of the bogie and a steering connecting rod, and the turning radius of the forklift can be calculated through a signal single chip microcomputer of the stroke sensor. A Hall sensor is installed on a differential case of a forklift drive axle, the Hall sensor can pick up the rotating speed of a drive shaft through a gear of the differential case, and the single chip microcomputer system calculates the running speed of the forklift through the signal. The single chip microcomputer control system consists of a Hall sensor, a stroke sensor, a warning horn, a power module and an electromagnetic valve. If the centrifugal force exceeds a set value when the turning speed is too high, the single chip microcomputer sends out a warning signal when the danger that the forklift overturns is obtained, and simultaneously drives the electromagnetic valve to cut off the oil way of the hydraulic cylinder to lock the hydraulic cylinder. After the hydraulic cylinder is locked, a piston rod which props against the bogie cannot retract, so that the frame cannot tilt, the gravity center of the vehicle does not shift any more, and the anti-overturning capacity of the vehicle is improved.

Description of the drawings:

FIG. 1 is a schematic diagram of the hydraulic system and mechanical structure of the present invention.

Fig. 2 is a schematic view of the installation position and mechanical structure of the sensor of the present invention.

FIG. 3 is a schematic diagram of a single-chip microcomputer control system of the present invention.

In fig. 1: 1. the hydraulic control system comprises a frame, 2, a hydraulic cylinder, 3, wheels, 4, a bogie, 5, a frame support plate, 6, a support shaft, 7, a normally open electromagnetic valve, 8 and a hydraulic pipeline.

In fig. 2: 3. the device comprises wheels, 4, a bogie, 5, a frame support plate, 6, a support shaft, 9, a steering oil cylinder, 10, a stroke sensor, 11, a steering connecting rod, 12, a differential case, 13 and a Hall sensor.

In fig. 3: 10. travel sensor, 13, Hall sensor, 7, normally open solenoid valve, 14, power module, 15, warning loudspeaker.

The specific implementation mode is as follows:

the embodiments of the invention will be further explained with reference to the drawings in which:

fig. 1 is a schematic view of a hydraulic system and a mechanical structure of the present invention (the steering mechanism is omitted from the figure). The frame (1) is hinged on a support shaft (6) of the bogie (4) through a frame support plate (5). 2 hydraulic cylinders (2) are arranged on the frame (1), piston rods of the hydraulic cylinders (2) are pressed against the bogie (4), and hydraulic pipelines (8) of the 2 hydraulic cylinders (2) are communicated through a normally open electromagnetic valve (7). When the forklift moves straightly on an uneven road surface, the wheels (3) on two sides of the bogie (4) can bump up and down, the wheels (3) drive the bogie (4) to rotate by taking the supporting shaft (6) as a center, so that piston rods of 2 hydraulic cylinders (2) which support the bogie (4) are retracted and extended out, and the hydraulic pipelines (8) of the 2 hydraulic cylinders (2) are communicated together through a normally open electromagnetic valve (7), the piston rods are only influenced by the flow resistance of a hydraulic medium, and the movement of the piston rods is not limited, so that the movement of the bogie (4) is not influenced. When the turning speed of the vehicle is too high and the single chip microcomputer calculates that the forklift is in danger of overturning, the normally open electromagnetic valve (7) is driven to work, an oil way of the hydraulic pipeline (8) is cut off, a piston rod of the hydraulic cylinder (2) cannot move, the piston rod abuts against the bogie (4) and cannot rotate, the gravity center of the vehicle is kept on the center line, and the danger of overturning of the forklift is reduced.

Fig. 2 is a schematic view of a sensor mounting position and a mechanical structure. A Hall sensor (13) is installed on a differential case (12) of a forklift drive axle, and the Hall sensor (13) picks up a rotating speed signal of a drive shaft by sensing the rotation of a gear in the differential case (12). The stroke sensor (10) is arranged between the steering oil cylinder (9) and the steering connecting rod (11), and when the steering oil cylinder (9) drives the steering connecting rod (11) to drive the wheels (3) to steer, the stroke sensor (10) is driven at the same time, so that the output signal of the stroke sensor (10) is changed. The single chip microcomputer can calculate the running speed and the turning radius of the forklift through signals of the Hall sensor (13) and the stroke sensor (10), when the single chip microcomputer obtains that the forklift is in danger of overturning, a warning signal is sent to the warning horn (15), meanwhile, the normally open electromagnetic valve (7) is driven to work through the power module (14), an oil way of the hydraulic pipeline (8) is cut off, and the piston rod abuts against the bogie (4) to enable the bogie to be incapable of rotating. When the single chip microcomputer obtains that no overturning danger exists, the normally open electromagnetic valve (7) is released, the oil circuit among the 2 hydraulic cylinders (2) is recovered to be smooth, and a piston rod of the hydraulic cylinder (2) can move along with the bogie (4).

FIG. 3 is a schematic diagram of a single-chip microcomputer control system of the present invention. The single chip microcomputer system receives signals of the Hall sensor (13) and the stroke sensor (10), calculates the 2 signals, sends out signals to the warning horn (15) when the situation that the forklift is in danger of overturning is obtained, and drives the normally open electromagnet (7) to work through the power module (14).

Claims

1. The utility model provides a fork truck anti-overturning device which characterized in that: the warning device comprises a sensor, a singlechip control system, a warning device, 2 hydraulic cylinders arranged on a frame, hydraulic pipelines communicated with the 2 hydraulic cylinders and a normally open electromagnetic valve; 2 pneumatic cylinders are installed on the frame, and the piston rod top of pneumatic cylinder is on the bogie, and the hydraulic line of 2 pneumatic cylinders communicates through a normally open solenoid valve, when the singlechip calculated that fork truck has the danger of toppling, the work of drive normally open solenoid valve cuts off hydraulic line's oil circuit.

2. The anti-toppling device for a forklift truck according to claim 1, wherein: a stroke sensor is arranged between a steering hydraulic cylinder of the bogie and a steering connecting rod, and the turning radius of the forklift can be calculated through a signal single chip microcomputer of the stroke sensor.

3. The anti-toppling device for a forklift truck according to claim 1, wherein: a Hall sensor is installed on a differential case of a forklift drive axle, the Hall sensor can pick up the rotating speed of a drive shaft through a gear of the differential case, and the single chip microcomputer system calculates the running speed of the forklift through the signal.

4. The anti-toppling device for a forklift truck according to claim 1, wherein: the single chip microcomputer control system consists of a Hall sensor, a stroke sensor, a warning horn, a power module and an electromagnetic valve.