CN111942318A - Forklift anti-overturning device - Google Patents

Abstract

The utility model relates to an anti-overturning device for a forklift. Two single-acting hydraulic cylinders are installed on both sides of the center of the forklift frame. The piston rods of the hydraulic cylinders stand against the bogie. A single-chip control system and 2 sensors are also installed on the forklift. When the single-chip computer calculates that the turning speed of the vehicle is too high, the power module drives the solenoid valve to close the oil circuit, and the hydraulic cylinder piston rod against the bogie cannot be retracted, so that the frame cannot be tilted, thus reducing the offset of the vehicle's center of gravity and improving the the anti-overturning ability of the vehicle.

Description

Forklift anti-overturning device

Technical field:

The invention relates to an anti-overturning device, in particular to an anti-overturning device for a counterbalanced forklift.

Background technique:

In order to adapt to work on uneven ground, the frame of the counterbalanced forklift usually adopts a 3-point support method, and the rear of the frame is hinged with the longitudinal support shaft in the middle of the bogie; the counterweight is installed on the frame, and the steering is due to the distance of the counterweight. The longitudinal support axis of the frame is farther away, which makes the center of gravity of the vehicle higher. When the forklift turns, the frame is inclined to the outside due to the centrifugal force, so that the counterweight position moves to the outside of the centerline of the forklift. The faster the turning speed, the greater the centrifugal force and the greater the offset of the counterweight position. When the center of gravity of the vehicle exceeds the supporting tire, the vehicle will overturn.

Invention content:

In order to solve the above-mentioned defects existing in the prior art, the technical scheme adopted in the present invention is:

Two single-acting hydraulic cylinders are installed on both sides of the center of the frame, the piston rods of the hydraulic cylinders stand against the bogie, and the oil circuits of the two hydraulic cylinders are connected through a normally open solenoid valve. When the vehicle travels straight on the uneven road, the up and down bumps of the wheels drive the bogie to rotate around the frame support shaft, and the bogie presses the piston rods of the two hydraulic cylinders, one extends and the other retracts. It only flows between the hydraulic cylinders, and the piston rod can move with the bogie. A travel sensor is installed on the steering cylinder of the forklift truck to detect the turning signal of the forklift truck. A Hall sensor is installed on the differential case of the forklift drive axle, and the speed signal of the drive shaft is obtained by picking up the rotation of the gear. These 2 sensor signals are sent to the microcontroller control system. When the forklift is turning, the single-chip microcomputer calculates the driving speed and turning radius of the forklift through these two signals. If the turning speed is too fast, the centrifugal force exceeds the set value. Road, lock the hydraulic cylinder. After the hydraulic cylinder is locked, the piston rod against the bogie cannot be retracted, so that the frame cannot be tilted, the center of gravity of the vehicle is no longer offset, and the anti-overturning ability of the vehicle is improved.

Description of drawings:

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

FIG. 2 is a schematic diagram 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 Figure 1: 1. Frame, 2. Hydraulic cylinder, 3. Wheel, 4. Bogie, 5. Frame support plate, 6. Support shaft, 7. Normally open solenoid valve, 8. Hydraulic pipeline.

In Figure 2: 3. Wheels, 4. Bogie, 5. Frame support plate, 6. Support shaft, 9. Steering cylinder, 10. Travel sensor, 11. Steering connecting rod, 12. Differential case, 13. Huo Er sensor.

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

Detailed ways:

Embodiments of the present invention are further described below in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of the hydraulic system and mechanical structure of the present invention (the steering mechanism is omitted in this figure). The frame (1) is hinged on the support shaft (6) of the bogie (4) through the frame support plate (5). Two hydraulic cylinders (2) are installed on the frame (1), the piston rods of the hydraulic cylinders (2) are on the bogie (4), and the hydraulic pipes (8) of the two hydraulic cylinders (2) pass through the normally open The solenoid valve (7) is connected. When the forklift travels straight on the uneven road, the wheels (3) on both sides of the bogie (4) will bump up and down, and the wheels (3) drive the bogie (4) to rotate with the support shaft (6) as the center, so as to withstand the One of the piston rods of the two hydraulic cylinders (2) of the bogie (4) is retracted and the other is extended, because the hydraulic lines (8) of the two hydraulic cylinders (2) are connected through the normally open solenoid valve (7) Together, the piston rod is only affected by the flow resistance of the hydraulic medium, and does not restrict the movement of the piston rod, so it will not affect the movement of the bogie (4). When the turning speed of the vehicle is too fast and the single chip computer calculates that the forklift is in danger of overturning, it drives the normally open solenoid valve (7) to work and cuts off the oil circuit of the hydraulic pipeline (8), so that the piston rod of the hydraulic cylinder (2) cannot move, and the piston The rod bears against the bogie (4) so that it cannot rotate, so that the center of gravity of the vehicle is kept on the center line, and the danger of the forklift overturning is reduced.

Figure 2 is a schematic diagram of the sensor installation location and mechanical structure. A Hall sensor (13) is installed on the differential case (12) of the drive axle of the forklift, and the Hall sensor (13) picks up the rotational speed signal of the drive shaft by sensing the rotation of the internal gear of the differential case (12). The stroke sensor (10) is installed between the steering cylinder (9) and the steering connecting rod (11). When the steering cylinder (9) drives the steering connecting rod (11) to drive the wheel (3) to turn, the stroke sensor (10) is simultaneously driven. , so that the output signal of the stroke sensor (10) changes. The single-chip microcomputer can calculate the traveling speed and turning radius of the forklift through the signals of the hall sensor (13) and the travel sensor (10). 14) Drive the normally open solenoid valve (7) to work, cut off the oil circuit of the hydraulic pipeline (8), and the piston rod bears the bogie (4) so that it cannot rotate. When the single-chip microcomputer finds that there is no danger of overturning, the normally open solenoid valve (7) is released, and the oil passage between the two hydraulic cylinders (2) is restored, so that the piston rod of the hydraulic cylinder (2) can move 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 the signals of the Hall sensor (13) and the travel sensor (10), calculates these two signals, and sends a signal to the warning horn (15) when it is concluded that the forklift is in danger of overturning, and sends a signal to the warning horn (15) through the power module (14) Drive the normally open electromagnet (7) to work.

Claims (5)

1. An anti-overturning device for a forklift, consisting of a sensor, a single-chip control system, a warning device, two hydraulic cylinders installed on the frame, a hydraulic pipeline connecting the two hydraulic cylinders, and a normally open solenoid valve. 2. The forklift anti-overturning device according to claim 1 is characterized in that: 2 hydraulic cylinders are installed on both sides of the center line of the frame, and the piston rods of the hydraulic cylinders are on the bogie; the hydraulic pipelines of the 2 hydraulic cylinders Communication through a normally open solenoid valve. 3. The anti-overturning device for a forklift truck according to claim 1, wherein a travel sensor is installed between the steering hydraulic cylinder of the bogie and the steering rod, and the single-chip microcomputer of the sensor signal can calculate the turning radius of the forklift truck. 4. the anti-overturning device of forklift as claimed in claim 1 is characterized in that: a Hall sensor is installed on the differential case of the drive axle of the forklift, the Hall sensor can pick up the rotational speed of the drive shaft by the gear of the differential case, and the single-chip microcomputer system passes this The signal calculates the travel speed of the forklift. 5. The forklift anti-overturning device according to claim 1, characterized in that: the single-chip control system is composed of a hall sensor, a travel sensor, a warning horn, a power module and a solenoid valve.

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