CN211231056U - Automatic explosion-proof fork truck hydraulic system of control - Google Patents
Automatic explosion-proof fork truck hydraulic system of control Download PDFInfo
- Publication number
- CN211231056U CN211231056U CN201921377016.9U CN201921377016U CN211231056U CN 211231056 U CN211231056 U CN 211231056U CN 201921377016 U CN201921377016 U CN 201921377016U CN 211231056 U CN211231056 U CN 211231056U
- Authority
- CN
- China
- Prior art keywords
- valve
- communicated
- oil
- port
- electromagnetic directional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 239000003921 oil Substances 0.000 claims abstract description 398
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
Images
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model relates to an automatic explosion-proof fork truck hydraulic system of control. The hydraulic oil pump brake system comprises a hydraulic oil tank, an oil pump, a control oil cylinder, a brake valve, a pair of brakes, a steering oil cylinder, a proportional electromagnetic directional valve, a first electromagnetic directional valve, a third electromagnetic directional valve, a one-way valve, a valve block assembly, a steering valve assembly and an energy accumulator; the valve block assembly comprises a check valve, an overflow valve and a switch valve which are connected in parallel; the steering valve assembly comprises a second electromagnetic directional valve, a first one-way throttle valve and a second one-way throttle valve. The utility model can meet the steering and driving requirements and the driving braking requirements through the logic control of a plurality of groups of electromagnetic valves, and can also provide emergency energy under the emergency condition that the power source is lost, thereby meeting the emergency braking requirements; and meanwhile, the parking brake requirement can be met.
Description
Technical Field
The utility model belongs to the technical field of fork truck hydraulic system, concretely relates to explosion-proof fork truck hydraulic system.
Background
The braking operation of the forklift during running is generally finished under the condition of operation of a driver. However, with the development of modern logistics technology, in some flammable and explosive occasions, an unmanned forklift is needed to complete loading and unloading operation, and running steering and braking are also needed to complete automatic control.
SUMMERY OF THE UTILITY MODEL
In order to realize the unmanned control requirement of the explosion-proof forklift, the control device can meet the steering control requirement in the driving process and the service braking requirement, and can also meet the emergency braking requirement under the condition that a power source is lost, provide emergency energy under the emergency condition and implement braking. The utility model provides an automatic explosion-proof fork truck hydraulic system of control.
An automatically controlled hydraulic system of an explosion-proof forklift comprises a hydraulic oil tank 1, an oil pump 2, a control oil cylinder 6, a brake valve 8, a pair of brakes 11 and a steering oil cylinder 22;
the system also comprises a proportional electromagnetic directional valve 5, a first electromagnetic directional valve 4, a third electromagnetic directional valve 9, a valve block assembly 18, a steering valve assembly and an energy accumulator 12; the valve block assembly 18 comprises a one-way valve 15, an overflow valve 16 and a switch valve 17; the steering valve assembly includes a second electromagnetic directional valve 20, a first one-way throttle valve 21, and a second one-way throttle valve 23.
An oil suction port of the oil pump 2 is communicated with the hydraulic oil tank 1, an oil outlet of the oil pump 2 is divided into two paths through the flow stabilizing valve 3, one path is communicated with an oil inlet P2 of the valve block assembly 18, the other path is communicated with an oil inlet P of the brake valve 8, a first working oil port N of the brake valve 8 is communicated with an oil inlet P3 of the second electromagnetic directional valve 20, an oil return port T3 of the second electromagnetic directional valve 20 is communicated with a working oil port d of the first electromagnetic directional valve 4, and a working oil port e of the first electromagnetic directional valve 4 is communicated with the hydraulic oil tank 1;
when the second electromagnetic directional valve 20 is located at the middle position, the oil inlet P3 is communicated with the oil return port T3; when the second electromagnetic directional valve 20 is reversed to the left position, the oil inlet P3 is communicated with the working oil port E, the working oil port F is communicated with the oil return port T3, when the second electromagnetic directional valve 20 is reversed to the right position, the oil inlet P3 is communicated with the working oil port F, and the working oil port E is communicated with the oil return port T3; one end of the first one-way throttle valve 21 is communicated with a working oil port F of the second electromagnetic directional valve 20, and the other end of the first one-way throttle valve is communicated with a right cavity of a steering oil cylinder 22; one end of the second one-way throttle valve 23 is communicated with a working oil port E of the second electromagnetic directional valve 20, and the other end is communicated with a left cavity of the steering oil cylinder 22;
when the first electromagnetic directional valve 4 is positioned in the middle position, the working oil port d is communicated with the working oil port e; when the first electromagnetic directional valve 4 is in the direction change position, the working oil port b is disconnected with the working oil port e;
the first working oil port A and the second working oil port B of the proportional electromagnetic directional valve 5 are respectively communicated with a rod cavity and a rodless cavity of the control oil cylinder 6, and when the proportional electromagnetic directional valve 5 is positioned in the middle position, the first working oil port A and the second working oil port B are both communicated with an oil return port T1; when the proportional electromagnetic directional valve 5 is in the direction change position, the oil inlet P1 is communicated with the first working oil port A, and the second working oil port B is communicated with the oil return port T1;
the first working oil port a of the electromagnetic valve 9 is communicated with a third working oil port A3 of the valve block assembly 18, the second working oil port b of the electromagnetic valve 9 is communicated with a second working oil port Br of the brake valve 8, the third working oil port c of the electromagnetic valve 9 is communicated with an inlet of the residual valve 10, and an outlet of the residual valve 10 is communicated with oil inlets of a pair of brakes 11; when the electromagnetic valve 9 is in the middle position, the first working oil port a is communicated with the third working oil port c; when the electromagnetic valve 9 is in the direction change position, the second working oil port b is communicated with the third working oil port c, and the first working oil port a and the third working oil port c are closed;
an oil inlet P2 of the valve block assembly 18 is an inlet of the check valve 15, an outlet of the check valve 15 is divided into six paths, and a first path is a first working oil port A1; the second path is communicated with an oil inlet of the overflow valve 16, an oil outlet of the overflow valve 16 is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank 1; the third path is that the second working oil port A2 is communicated, and the second working oil port A2 is communicated with the accumulator 12; the fourth path is communicated with an inlet of the switch valve 17, an outlet of the switch valve 17 is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank 1; the fifth path is a third working oil port A3, the third working oil port A3 is communicated with a first connector of a three-way pipe 19, a second connector of the three-way pipe 19 is communicated with a first working oil port a of an electromagnetic valve 9, and a third connector of the three-way pipe 19 is communicated with a third working oil port Pa of a brake valve 8; the sixth path is a fourth working oil port A4, and the fourth working oil port A4 is communicated with an oil inlet P1 of the electromagnetic directional valve 5;
when the brake valve 8 does not work at a normal position, an oil inlet P of the brake valve 8 is communicated with a first working oil port N, and an oil inlet Br of the brake valve 8 is communicated with an oil return port T; when the brake valve 8 is in a driving brake working state, an oil inlet P of the brake valve 8 is communicated with a second working oil port Br, and the oil inlet P is also connected with a first working oil port N through a built-in throttling channel 24; when the brake valve 8 is in an emergency braking working state, no pressure is provided to an oil inlet P of the brake valve 8, and a second working oil port Br of the brake valve 8 is communicated with a third working oil port Pa;
the control and regulation of the working state of the brake valve 8 are realized by driving the control oil cylinder 6 to move through the link mechanism 7.
The technical scheme for further limiting is as follows:
the first electromagnetic directional valve 4 is a two-position two-way electromagnetic directional valve.
The second electromagnetic directional valve 20 is a three-position four-way electromagnetic directional valve.
The proportional electromagnetic directional valve 5 is a two-position four-way electromagnetic proportional directional valve.
The third electromagnetic directional valve 9 is a two-position three-way electromagnetic directional valve.
The brake valve 8 is a full hydraulic dynamic brake valve.
The first path is that a low-pressure alarm switch 13 and a system unloading switch 14 are arranged on a first working oil port A1 of the valve block assembly 18.
One end of the connecting rod mechanism 7 is connected with a piston rod of the control oil cylinder 6, and the other end of the connecting rod mechanism 7 is connected with a valve rod of the brake valve 8.
The beneficial technical effects of the utility model are embodied in the following aspects:
1. the utility model discloses automatically controlled fork truck hydraulic steering braking system through the logic control of first electromagnetic directional valve 4, second electromagnetic directional valve 20, third electromagnetic directional valve 9, electromagnetism proportional directional valve 5 and valve block assembly 18, can satisfy the steering travel requirement, can satisfy the driving braking requirement again, can also provide the emergency energy under the emergency that the power supply loses simultaneously, satisfies the emergency braking requirement; and meanwhile, the parking brake requirement can be met.
2. The logic control mechanism of the utility model is that: when the forklift is started and does not run, the first electromagnetic directional valve 4 is electrically switched, and the oil pump 2 is started to charge the energy accumulator 12. When the charging pressure of the energy accumulator 12 reaches the set pressure of the system unloading switch 14, the first electromagnetic directional valve 4 is de-energized, and the oil pump is unloaded.
When the forklift is started to prepare for running, the third electromagnetic directional valve 9 is electrified for reversing, and pressure oil in the brake 11 returns to the hydraulic oil tank 1 through the residual valve 10, the third electromagnetic directional valve 9, the second working oil port Br of the brake valve 8 and the oil return port T, so that the brake 11 is in a pressure release state, and the normal running of the vehicle is ensured. When the forklift is started to run, the first electromagnetic directional valve 4 is in a power-off state, the second electromagnetic directional valve 20 is powered on and is switched to the left position or the right position, pressure oil output by the oil pump 2 passes through the oil inlet P of the brake valve 8, the first working oil port N, the second electromagnetic directional valve 20 and the one-way throttle valve 21 (or the one-way throttle valve 23) to reach the left cavity and the right cavity of the steering oil cylinder 22, and pressure oil in the other cavity returns to the hydraulic oil tank 1 through the throttle valve 23 (or the one-way throttle valve 21) and the first electromagnetic directional valve 4 to control the forklift to run in a steering mode.
When a forklift meets an obstacle in the running process and needs service braking, the proportional electromagnetic directional valve 5 is electrified for reversing, pressure oil in the energy accumulator 12 is output to the control oil cylinder 6, the control oil cylinder 6 drives the link mechanism 7 to control the stroke and the gear of the brake valve 8, so that the pressure oil output by the oil pump 2 reaches the brake 11 through the brake valve 8 and the third electromagnetic directional valve 9 to implement service braking; meanwhile, pressure oil output by the oil pump 2 can enter from an oil inlet P2 of the valve block assembly 18, and the accumulator 12 is charged through a second working oil port A2 of the valve block assembly 18, so that the demand of a brake oil source is ensured (at this time, the first electromagnetic directional valve 4 is in a power-off state). Meanwhile, the supply of the steering oil by the pressure oil output by the oil pump 2 is completed through the oil supply of an oil inlet P of the brake valve 8 and a throttling channel 24 arranged in the first working oil port N.
When the service brake is released, the proportional electromagnetic directional valve 5 is de-energized, the brake valve 8 returns under the action of spring force, and pressure oil of the brake 11 returns through the third electromagnetic directional valve 9 and the brake valve 8, so that the brake 11 is in a release state, and the normal running of the vehicle is ensured.
In the running process of the forklift, if the pressure of the energy accumulator 12 is lower than the set pressure of the low-pressure alarm switch 13, the first electromagnetic directional valve 4 is electrified and reversed, and the oil pump 2 is started to charge the energy accumulator 12. When the charging pressure of the energy accumulator 12 reaches the set pressure of the system unloading switch 14, the first electromagnetic directional valve 4 is de-energized again, and the oil pump is unloaded.
And when the power supply of the whole vehicle is turned off, the first electromagnetic directional valve 4, the proportional electromagnetic directional valve 5 and the third electromagnetic directional valve 9 are all in a neutral power-off state. The accumulator 12 outputs pressure oil, and the pressure oil reaches the brake 11 through the valve block assembly 18 and the third electromagnetic directional valve 9 to implement parking braking.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Sequence numbers in the upper figure: the hydraulic control system comprises a hydraulic oil tank 1, an oil pump 2, a flow stabilizing valve 3, a first electromagnetic directional valve 4, a proportional electromagnetic directional valve 5, a control oil cylinder 6, a link mechanism 7, a brake valve 8, a third electromagnetic directional valve 9, a residual valve 10, a brake 11, an energy accumulator 12, a low-pressure alarm switch 13, a system unloading switch 14, a one-way valve 15, an overflow valve 16, a switch valve 17, a second electromagnetic directional valve 20, a first one-way throttle valve 21, a steering oil cylinder 22, a second one-way throttle valve 23 and a throttling channel 24.
Detailed Description
The invention will now be further described by way of example with reference to the accompanying drawings.
Referring to fig. 1, an automatically controlled hydraulic system of an explosion-proof forklift truck comprises a hydraulic oil tank 1, an oil pump 2, a control oil cylinder 6, a brake valve 8, a pair of brakes 11 and a steering oil cylinder 22;
the system also comprises a proportional electromagnetic directional valve 5, a first electromagnetic directional valve 4, a third electromagnetic directional valve 9, a valve block assembly 18, a steering valve assembly and an energy accumulator 12; the valve block assembly 18 comprises a one-way valve 15, an overflow valve 16 and a switch valve 17; the steering valve assembly includes a second electromagnetic directional valve 20, a first one-way throttle valve 21, and a second one-way throttle valve 23.
The first electromagnetic directional valve 4 is a two-position two-way electromagnetic directional valve, the second electromagnetic directional valve 20 is a three-position four-way electromagnetic directional valve, the third electromagnetic directional valve 9 is a two-position three-way electromagnetic directional valve, and the proportional electromagnetic directional valve 5 is a two-position four-way electromagnetic proportional directional valve. The brake valve 8 is a full hydraulic power brake valve, different oil circuit switching can be realized when the brake valve is in different working states, and the brake valve can be automatically reset by a return spring.
An oil suction port of the oil pump 2 is communicated with the hydraulic oil tank 1, an oil outlet of the oil pump 2 is divided into two paths through the flow stabilizing valve 3, one path is communicated with an oil inlet P2 of the valve block assembly 18, the other path is communicated with an oil inlet P of the brake valve 8, a first working oil port N of the brake valve 8 is communicated with an oil inlet P3 of the second electromagnetic directional valve 20, an oil return port T3 of the second electromagnetic directional valve 20 is communicated with a working oil port d of the first electromagnetic directional valve 4, and a working oil port e of the first electromagnetic directional valve 4 is communicated with the hydraulic oil tank 1;
when the second electromagnetic directional valve 20 is located at the middle position, the oil inlet P3 is communicated with the oil return port T3; when the second electromagnetic directional valve 20 is reversed to the left position, the oil inlet P3 is communicated with the working oil port E, the working oil port F is communicated with the oil return port T3, when the second electromagnetic directional valve 20 is reversed to the right position, the oil inlet P3 is communicated with the working oil port F, and the working oil port E is communicated with the oil return port T3; one end of the first one-way throttle valve 21 is communicated with a working oil port F of the second electromagnetic directional valve 20, and the other end of the first one-way throttle valve is communicated with a right cavity of a steering oil cylinder 22; one end of the second one-way throttle valve 23 is communicated with a working oil port E of the second electromagnetic directional valve 20, and the other end is communicated with a left cavity of the steering oil cylinder 22;
when the first electromagnetic directional valve 4 is positioned in the middle position, the working oil port d is communicated with the working oil port e; when the first electromagnetic directional valve 4 is in the direction change position, the working oil port b is disconnected with the working oil port e;
the first working oil port A and the second working oil port B of the proportional electromagnetic directional valve 5 are respectively communicated with a rod cavity and a rodless cavity of the control oil cylinder 6, and when the proportional electromagnetic directional valve 5 is positioned in the middle position, the first working oil port A and the second working oil port B are both communicated with an oil return port T1; when the proportional electromagnetic directional valve 5 is in the direction change position, the oil inlet P1 is communicated with the first working oil port A, and the second working oil port B is communicated with the oil return port T1;
the first working oil port a of the electromagnetic valve 9 is communicated with a third working oil port A3 of the valve block assembly 18, the second working oil port b of the electromagnetic valve 9 is communicated with a second working oil port Br of the brake valve 8, the third working oil port c of the electromagnetic valve 9 is communicated with an inlet of the residual valve 10, and an outlet of the residual valve 10 is communicated with oil inlets of a pair of brakes 11; when the electromagnetic valve 9 is in the middle position, the first working oil port a is communicated with the third working oil port c; when the electromagnetic valve 9 is in the direction change position, the second working oil port b is communicated with the third working oil port c, and the first working oil port a and the third working oil port c are closed;
an oil inlet P2 of the valve block assembly 18 is an inlet of a check valve 15, an outlet of the check valve 15 is divided into six paths, the first path is a first working oil port A1, and a low-pressure alarm switch 13 and a system unloading switch 14 are installed on the first working oil port A1; the low-pressure alarm switch 13 reminds and informs that the pressure of the energy accumulator is lower than the minimum set pressure required by the system on one hand, and provides an electric signal for the first electromagnetic directional valve 4 to charge the energy accumulator on the other hand. The system unloading switch 14 gives out a power-off signal of the first electromagnetic directional valve 4 according to the working requirement of the system, so that the oil pump 2 is unloaded. The second path is communicated with an oil inlet of the overflow valve 16, an oil outlet of the overflow valve 16 is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank 1; the third path is that the second working oil port A2 is communicated, and the second working oil port A2 is communicated with the accumulator 12; the fourth path is communicated with an inlet of the switch valve 17, an outlet of the switch valve 17 is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank 1; the fifth path is a third working oil port A3, the third working oil port A3 is communicated with a first connector of a three-way pipe 19, a second connector of the three-way pipe 19 is communicated with a first working oil port a of an electromagnetic valve 9, and a third connector of the three-way pipe 19 is communicated with a third working oil port Pa of a brake valve 8; the sixth path is a fourth working oil port A4, and the fourth working oil port A4 is communicated with an oil inlet P1 of the electromagnetic directional valve 5;
when the brake valve 8 does not work at a normal position, an oil inlet P of the brake valve 8 is communicated with a first working oil port N, and an oil inlet Br of the brake valve 8 is communicated with an oil return port T; when the brake valve 8 is in a driving brake working state, an oil inlet P of the brake valve 8 is communicated with a second working oil port Br, and the oil inlet P is also connected with a first working oil port N through a built-in throttling channel 24; when the brake valve 8 is in an emergency braking working state, no pressure is provided to the oil inlet P of the brake valve 8, and the second working oil port Br of the brake valve 8 is communicated with the third working oil port Pa.
The control and regulation of the working state of the brake valve 8 are realized by driving the control cylinder 6 to move through the link mechanism 7. One end of the connecting rod mechanism 7 is connected with a piston rod of the control oil cylinder 6, and the other end of the connecting rod mechanism 7 is connected with a valve rod of the brake valve 8.
The working principle of the utility model is explained in detail as follows:
when the forklift is started and does not run, the first electromagnetic directional valve 4 is electrified to change the direction, and the first working oil port d and the second working oil port e are closed; the oil pump 2 starts to supply oil, pressure oil output by the oil pump 2 enters from an oil inlet P2 of the valve block assembly 18 and fills the accumulator 12 through a second working oil port A2 of the valve block assembly 18, and the highest pressure of the accumulator 12 during filling is limited by the overflow valve 16; meanwhile, the pressure oil output by the oil pump 2 reaches the brake 11 through the third working oil port a3 of the valve block assembly 18, the first working oil port a and the third working oil port c of the third electromagnetic directional valve 9 and the residual valve 10, so as to ensure that the vehicle is in a braking state. When the charging pressure of the energy accumulator 12 reaches the set pressure of the system unloading switch 14, the first electromagnetic directional valve 4 is de-energized, the pressure oil output by the oil pump 2 enters the hydraulic oil tank 1 through the oil inlet P, N of the brake valve 8, the first working oil port d and the second working oil port e of the first electromagnetic directional valve 4, and the oil pump unloads.
When the forklift is started to prepare for running, the third electromagnetic directional valve 9 is electrically switched, the first working oil port a and the third working oil port c of the third electromagnetic directional valve 9 are closed, the third working oil port c is communicated with the second working oil port b, and pressure oil in the brake 11 returns to the hydraulic oil tank 1 through the residual valve 10, the third working oil port c and the second working oil port b of the third electromagnetic directional valve 9, the second working oil port Br and the oil return port T of the valve 8, so that the brake 11 is in a release state, and normal running of the vehicle is ensured. When the forklift is started to run, the first electromagnetic directional valve 4 is electrified to change the direction, the second electromagnetic directional valve 20 is electrified to change the direction to the left position or the right position, and pressure oil output by the oil pump 2 passes through the oil inlet P of the brake valve 8, the first working oil port N, the second electromagnetic directional valve 20 and the one-way throttle valve 21 (or the one-way throttle valve 22) to reach the left cavity and the right cavity of the steering oil cylinder 22, so that the forklift is controlled to run in a steering mode.
When a forklift meets an obstacle and needs to be braked during running, the proportional electromagnetic directional valve 5 is powered on to change direction, pressure oil in the energy accumulator 12 is output, passes through a second working oil port A2 and a fourth working oil port A4 of the valve block assembly 18, reaches an oil inlet P1 of the proportional electromagnetic directional valve 5, enters a rodless cavity of the control oil cylinder 6 through the working oil port A, pushes the control oil cylinder 6 to drive the link mechanism 7 to control the stroke and the gear of the brake valve 8 (the input current of the proportional electromagnetic directional valve 5 controls the stroke, the output flow and the pressure of the brake valve 8), so that the oil inlet P of the brake valve 8 is disconnected with the first working oil port N, and the oil inlet P is communicated with the second working oil port Br; thus, the pressure oil output by the oil pump 2 reaches the brake 11 through the oil inlet P and the second working oil port Br of the brake valve 8, the second working oil port b and the third working oil port c of the third electromagnetic directional valve 9 and the residual valve 10 to implement braking; meanwhile, pressure oil output by the oil pump 2 can also enter an oil inlet P2 of the valve block assembly 18 to charge the accumulator 12 through a second working oil port A2 of the valve block assembly 18, so that sufficient oil quantity in the accumulator 12 is ensured. Meanwhile, the steering oil is communicated with a throttling channel arranged in the first working oil port N through an oil inlet P of the brake valve 8 for supplying oil.
When the service brake is released, the proportional electromagnetic directional valve 5 loses power, the first working oil port A, the second working oil port B and the oil return port T1 of the proportional electromagnetic directional valve 5 which are communicated with the two cavities of the control oil cylinder 6 are communicated for oil return, and the brake valve 8 drives the link mechanism 7 to enable the control oil cylinder 6 to return to the original position under the action of the return spring. The third electromagnetic directional valve 9 is electrically switched, the first working oil port a and the third working oil port c of the third electromagnetic directional valve 9 are closed, the third working oil port c is communicated with the second working oil port b, and the pressure oil in the brake 11 returns to the hydraulic oil tank through the residual valve 10, the third working oil port c and the second working oil port b of the third electromagnetic directional valve 9, the second working oil port Br of the dynamic brake valve 8 and the oil return port T, so that the brake 11 is in a release state, and the normal running of the vehicle is ensured.
In the running process of the forklift, when the pressure of the energy accumulator 12 is lower than the set pressure of the low-pressure alarm switch 13, the first electromagnetic directional valve 4 is electrified to change the direction, and the first working oil port d and the second working oil port e are closed; the pressure oil output by the oil pump 2 can also enter from the oil inlet P2 of the valve block assembly 18, and charge the accumulator 12 through the second working oil port a2 of the valve block assembly 18. When the charging pressure of the energy accumulator 12 reaches the set pressure of the system unloading switch 14, the first electromagnetic directional valve 4 is de-energized, the pressure oil output by the oil pump 2 enters the hydraulic oil tank 1 through the oil inlet P of the brake valve 8, the first working oil port N, the first working oil port d of the first electromagnetic directional valve 4 and the second working oil port e, and the oil pump unloads.
When the oil pump 2 is damaged or the engine suddenly stops, no pressure is supplied to the oil inlet P of the brake valve 8, and the system also has an emergency braking function. The oil pump 2 stops supplying oil, the accumulator 12 outputs pressure oil, the pressure oil passes through a fourth working oil port A4 of the valve block assembly 18, reaches an oil inlet P1 of the proportional electromagnetic directional valve 5, enters a rodless cavity of the control oil cylinder 6 through a first working oil port A of the proportional electromagnetic directional valve 5, and drives the link mechanism 7 to control the gear of the brake valve 8 through a piston rod of the control oil cylinder 6, so that a second working oil port Br of the brake valve 8 is communicated with a third working oil port Pa. At this time, the pressure oil output from the accumulator 12 passes through the third working port a3 of the valve block assembly 18, the three-way pipe 19, the third working port Pa of the brake valve 8, the second working port Br of the brake valve 8, the second working port b and the third working port c of the third electromagnetic directional valve 9, and the residual valve 10 to reach the brake 11, and emergency braking is performed.
And stopping the vehicle, and under the condition that the power supply of the whole vehicle is closed, the first electromagnetic directional valve 4, the proportional electromagnetic directional valve 5 and the third electromagnetic directional valve 9 are all in a neutral state. The accumulator 12 outputs pressure oil, and the pressure oil reaches the brake 11 through the third working oil port a3 of the valve block assembly 18, the three-way pipe 19, the first working oil port a and the third working oil port c of the third electromagnetic directional valve 9 and the residual valve 10, so that the braking is implemented, and the parking braking requirement can be met.
Claims (8)
1. The utility model provides an automatic explosion-proof fork truck hydraulic system of control, includes hydraulic tank (1), oil pump (2), control cylinder (6), brake valve (8), a pair of stopper (11), steering cylinder (22), its characterized in that:
the hydraulic steering system also comprises a proportional electromagnetic directional valve (5), a first electromagnetic directional valve (4), a third electromagnetic directional valve (9), a valve block assembly (18), a steering valve assembly and an energy accumulator (12); the valve block assembly (18) comprises a one-way valve (15), an overflow valve (16) and a switch valve (17); the steering valve assembly comprises a second electromagnetic directional valve (20), a first one-way throttle valve (21) and a second one-way throttle valve (23);
an oil suction port of the oil pump (2) is communicated with the hydraulic oil tank (1), an oil outlet of the oil pump (2) is divided into two paths through the flow stabilizing valve (3), one path is communicated with an oil inlet P2 of the valve block assembly (18), the other path is communicated with an oil inlet P of the brake valve (8), a first working oil port N of the brake valve (8) is communicated with an oil inlet P3 of the second electromagnetic directional valve (20), an oil return port T3 of the second electromagnetic directional valve (20) is communicated with a first working oil port d of the first electromagnetic directional valve (4), and a second working oil port e of the first electromagnetic directional valve (4) is communicated with the hydraulic oil tank (1);
when the second electromagnetic directional valve (20) is in a neutral position, the oil inlet P3 is communicated with the oil return port T3; when the second electromagnetic directional valve (20) is reversed to the left position, the oil inlet P3 is communicated with the working oil port E, the working oil port F is communicated with the oil return port T3, when the second electromagnetic directional valve (20) is reversed to the right position, the oil inlet P3 is communicated with the working oil port F, and the working oil port E is communicated with the oil return port T3; one end of the first one-way throttle valve (21) is communicated with a working oil port F of the second electromagnetic directional valve (20), and the other end of the first one-way throttle valve is communicated with a right cavity of the steering oil cylinder (22); one end of the second one-way throttle valve (23) is communicated with a working oil port E of the second electromagnetic directional valve (20), and the other end of the second one-way throttle valve is communicated with a left cavity of the steering oil cylinder (22);
when the first electromagnetic directional valve (4) is positioned at the middle position, the first working oil port d is communicated with the second working oil port e; when the first electromagnetic directional valve (4) is in the direction change position, the first working oil port d is disconnected with the second working oil port e;
a first working oil port A and a second working oil port B of the proportional electromagnetic directional valve (5) are respectively communicated with a rod cavity and a rodless cavity of the control oil cylinder (6), and when the proportional electromagnetic directional valve (5) is in a middle position, the first working oil port A and the second working oil port B are both communicated with an oil return port T1; when the proportional electromagnetic directional valve (5) is in the direction change, the oil inlet P1 is communicated with the first working oil port A, and the second working oil port B is communicated with the oil return port T1;
a first working oil port a of the third electromagnetic directional valve (9) is communicated with a third working oil port A3 of the valve block assembly (18), a second working oil port b of the third electromagnetic directional valve (9) is communicated with a second working oil port Br of the brake valve (8), a third working oil port c of the third electromagnetic directional valve (9) is communicated with an inlet of the residual valve (10), and an outlet of the residual valve (10) is communicated with oil inlets of a pair of brakes (11); when the third electromagnetic directional valve (9) is positioned at the middle position, the first working oil port a is communicated with the third working oil port c; when the third electromagnetic directional valve (9) is in the direction change position, the second working oil port b is communicated with the third working oil port c, and the first working oil port a and the third working oil port c are closed;
an oil inlet P2 of the valve block assembly (18) is an inlet of a check valve (15), an outlet of the check valve (15) is divided into six paths, and the first path is a first working oil port A1; the second path is communicated with an oil inlet of the overflow valve (16), an oil outlet of the overflow valve (16) is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank (1); the third path is that the second working oil port A2 is communicated, and the second working oil port A2 is communicated with the energy accumulator (12); the fourth path is communicated with an inlet of a switch valve (17), an outlet of the switch valve (17) is communicated with an oil return port T2, and an oil return port T2 is communicated with the hydraulic oil tank (1); the fifth path is a third working oil port A3, the third working oil port A3 is communicated with a first connector of a three-way pipe (19), a second connector of the three-way pipe (19) is communicated with a first working oil port a of a third electromagnetic directional valve (9), and a third connector of the three-way pipe (19) is communicated with a third working oil port Pa of a brake valve (8); the sixth path is a fourth working oil port A4, and the fourth working oil port A4 is communicated with an oil inlet P1 of the electromagnetic directional valve (5);
when the brake valve (8) does not work at a normal position, an oil inlet P of the brake valve (8) is communicated with a first working oil port N, and an oil inlet Br of the brake valve (8) is communicated with an oil return port T; when the brake valve (8) is in a braking working state during driving, an oil inlet P of the brake valve (8) is communicated with a second working oil port Br, and the oil inlet P is also connected with a first working oil port N through a built-in throttling channel (24); when the brake valve (8) is in an emergency braking working state, no pressure is provided to an oil inlet P of the brake valve (8), and a second working oil port Br of the brake valve (8) is communicated with a third working oil port Pa;
the control and regulation of the working state of the brake valve (8) are realized by controlling the movement of the oil cylinder (6) through the link mechanism (7).
2. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: the first electromagnetic directional valve (4) is a two-position two-way electromagnetic directional valve.
3. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: the second electromagnetic directional valve (20) is a three-position four-way electromagnetic directional valve.
4. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: the proportional electromagnetic directional valve (5) is a two-position four-way electromagnetic proportional directional valve.
5. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: the third electromagnetic directional valve (9) is a two-position three-way electromagnetic directional valve.
6. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: the brake valve (8) is a full hydraulic dynamic brake valve.
7. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: and a low-pressure alarm switch (13) and a system unloading switch (14) are arranged on a first working oil port A1 of the first path valve block assembly (18).
8. The automatically controlled hydraulic system of an explosion-proof forklift truck as set forth in claim 1, wherein: one end of the connecting rod mechanism (7) is connected with a piston rod of the control oil cylinder (6), and the other end of the connecting rod mechanism (7) is connected with a valve rod of the brake valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921377016.9U CN211231056U (en) | 2019-08-23 | 2019-08-23 | Automatic explosion-proof fork truck hydraulic system of control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921377016.9U CN211231056U (en) | 2019-08-23 | 2019-08-23 | Automatic explosion-proof fork truck hydraulic system of control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211231056U true CN211231056U (en) | 2020-08-11 |
Family
ID=71932009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921377016.9U Withdrawn - After Issue CN211231056U (en) | 2019-08-23 | 2019-08-23 | Automatic explosion-proof fork truck hydraulic system of control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211231056U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566521A (en) * | 2019-08-23 | 2019-12-13 | 安徽合力股份有限公司 | automatic explosion-proof fork truck hydraulic system of control |
-
2019
- 2019-08-23 CN CN201921377016.9U patent/CN211231056U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566521A (en) * | 2019-08-23 | 2019-12-13 | 安徽合力股份有限公司 | automatic explosion-proof fork truck hydraulic system of control |
| CN110566521B (en) * | 2019-08-23 | 2024-05-10 | 安徽合力股份有限公司 | Automatic explosion-proof fork truck hydraulic system of control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102951198B (en) | A kind of vehicle and fluid-link steering drive system | |
| CN108317112B (en) | Fork truck duplex pump turns to parking braking and releases hydraulic system | |
| CN102935861A (en) | Multi-axle vehicle and steering control system and steering control method thereof | |
| CN103950870A (en) | Forklift hydraulic system with energy recovery and double-pump oil supply functions | |
| CN110566521B (en) | Automatic explosion-proof fork truck hydraulic system of control | |
| CN114179906B (en) | Emergency steering system and working vehicle | |
| CN211231056U (en) | Automatic explosion-proof fork truck hydraulic system of control | |
| US11371535B2 (en) | Fluid pressure circuit | |
| CN215663380U (en) | Hydraulic brake system and working machine | |
| CN109017981B (en) | Walking machine and hydraulic steering system thereof | |
| CN211231051U (en) | Unmanned operation automatic control forklift brake hydraulic system | |
| CN112389401B (en) | Electric control hydraulic braking system | |
| CN110541856B (en) | Unmanned automatic control's fork truck braking hydraulic system | |
| CN111120433B (en) | Electric forklift and hydraulic system thereof | |
| CN216994270U (en) | Hydraulic control valve group and trailer hydraulic braking system and tractor comprising same | |
| CN203604282U (en) | Braking, steering, lifting main control hydraulic integrated block of heavy loading truck | |
| CN203890013U (en) | Double-pump oil supply and energy recovery type forklift hydraulic system | |
| CN214874759U (en) | Multifunctional electromagnetic reversing valve type double-motor redundant braking system | |
| CN216278724U (en) | Closed pump control system capable of quickly releasing hydraulic energy | |
| CN221251131U (en) | Fork truck hydraulic braking system | |
| CN114103900B (en) | Hydraulic braking system and forklift | |
| CN116788353A (en) | Liquid filling valve, hydraulic steering braking system and engineering vehicle | |
| CN218661779U (en) | Electro-hydraulic braking system of port unmanned container transport vehicle | |
| CN221141123U (en) | Automatic control system for forklift service brake | |
| CN112855642B (en) | Electric control valve device, parking system and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200811 Effective date of abandoning: 20240510 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200811 Effective date of abandoning: 20240510 |