CN210113154U - Hydraulic braking system of mining dump truck - Google Patents
Hydraulic braking system of mining dump truck Download PDFInfo
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- CN210113154U CN210113154U CN201821930564.5U CN201821930564U CN210113154U CN 210113154 U CN210113154 U CN 210113154U CN 201821930564 U CN201821930564 U CN 201821930564U CN 210113154 U CN210113154 U CN 210113154U
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Abstract
A hydraulic brake system of a mining dump truck is characterized in that an oil inlet of a front axle brake or a rear axle service brake is connected with an oil outlet of a displacement compensation valve; when the displacement compensation valve is used for compensating a front axle brake, an oil inlet of the displacement compensation valve is connected with an oil port A of a front axle brake valve of the two-way brake valve; when the displacement compensation valve is used for compensating a rear axle service brake, an oil inlet of the displacement compensation valve is connected with an A2 oil port of the relay valve. The brake device has the advantages that a certain amount of low-pressure oil liquid is still reserved in the rear axle brake pipeline or the front axle brake pipeline after the brake is released, the brake time can be reduced during the next brake, the brake is rapid, and the brake device has a displacement compensation effect when the displacement of the rear brake is increased after the friction plate is worn, so that the brake time is shortened, and the brake is sensitive; the system is independent of a service braking system and an emergency braking system, has few braking elements, has simple structure and prolongs the service life of the service braking system and the emergency braking system; when the double-path brake valve breaks down, the auxiliary brake can be realized, and the driving safety of the mining dump truck is improved.
Description
Technical Field
The utility model relates to an engineering machine tool technical field, in particular to mining dump truck hydraulic braking system.
Background
The rigid mining dump truck with the weight of more than 50 tons is large-scale mining transportation equipment, and machines in large-scale mines work continuously for 24 hours, so that very high requirements on the safety and reliability of the machines are provided. Normally, the rigid dump trucks below 50 tons adopt pneumatic braking, but the diameter of a brake air chamber is large due to low working pressure of a pneumatic braking pipeline, the brake air chamber can only be arranged outside a brake, and a brake shoe is driven by a rod and a cam, so that the structure is complex, and the action lag time of the pneumatic braking is long, so the rigid dump trucks above 50 tons adopt hydraulic braking systems.
The existing hydraulic brake system of the rigid mining dump truck generally comprises: the accumulator group, the two-way brake valve, the loading brake valve, the shuttle valve, the relay valve, the back pressure valve and the front and rear axle brakes.
The back pressure valve in the system ensures that a certain amount of low-pressure oil liquid is still reserved in a rear wheel brake pipeline after the brake is released, the brake time can be reduced during the next brake, the brake is rapid, the displacement can be increased to several times of the displacement before the friction plate of the brake is worn, and the back pressure of the system can not be adjusted, so that the pressure can be built up only for a long time after the friction plate is worn, and the brake is lagged.
In the system, when loading or unloading, the emergency brake valve needs to be powered off, and the loading brake valve is powered on, namely, pressure is applied to a pilot port of the two-way brake valve through the emergency brake valve, pressure oil is applied to the pilot port of the relay valve through the two-way brake valve, the pressure oil is applied to the front service brake and the rear service brake through the relay valve, and then an oil path from the two-way brake valve to the front brake is disconnected through the brake locking valve, so that loading brake is realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shorten braking reaction time, improve mining dump truck's security, strengthen the mining dump truck hydraulic braking system of the market competition of product.
The utility model discloses a solution is such:
a hydraulic brake system of a mining dump truck comprises a rear brake energy accumulator, a front brake energy accumulator, a two-way brake valve, a loading brake valve, a front axle service brake, a rear axle service brake and a relay valve, wherein an oil inlet of the front axle brake or the rear axle service brake is connected with an oil outlet of a displacement compensation valve; when the displacement compensation valve is used for compensating a front axle brake, an oil inlet of the displacement compensation valve is connected with an oil port A of a front axle brake valve of the two-way brake valve; when the displacement compensation valve is used for compensating a rear axle service brake, an oil inlet of the displacement compensation valve is connected with an A2 oil port of the relay valve.
The utility model has the advantages that a displacement compensation valve is added in front of the rear brake of the rear axle brake circuit or in front of the front brake of the front axle brake circuit, so that a certain amount of low-pressure oil liquid is still reserved in the rear axle brake pipeline or the front axle brake pipeline after the brake is released, the brake time can be reduced during the next brake, the brake is rapid, and the displacement compensation function is realized when the displacement of the rear brake is increased after the friction plate is worn, so that the brake time is shortened, and the brake is sensitive; besides, the system is independent of a service braking system and an emergency braking system, reduces braking elements and has a simple structure. The service life of the service braking system and the emergency braking system is prolonged. Meanwhile, when the double-path brake valve breaks down, the auxiliary brake system is further provided, and the driving safety of the mining dump truck is improved.
Drawings
Fig. 1 is a hydraulic schematic diagram of a first embodiment of the present invention.
Fig. 2 is a hydraulic schematic diagram of a second embodiment of the present invention.
The reference numbers in the figures are: the brake system comprises a rear brake energy accumulator 1, a front brake energy accumulator 2, a two-way brake valve 3, a loading brake valve 4, a front axle service brake 5, a rear axle service brake 6, a displacement compensation valve 7 and a relay valve 8.
Detailed Description
The utility model discloses increase a discharge capacity compensating valve before the rear brake of rear axle braking circuit or the front brake of front axle braking circuit, according to this principle, there is following embodiment:
the first embodiment is as follows:
as shown in fig. 1, for the front dry and rear wet braking system, a displacement compensation valve is installed only in the rear braking system, i.e. the oil inlet of the rear axle traveling brake 6 is connected with the oil outlet of the displacement compensation valve 7, and the oil inlet of the displacement compensation valve 7 is connected with the oil outlet a2 of the relay valve 8.
The working principle of the embodiment is as follows: the driver steps on the brake pedal, the oil in the front brake energy accumulator 2 enters the front axle service brake 5 through the two-way brake valve 3, the oil in the rear brake energy accumulator 1 reaches a pilot port of the relay valve 8 through the two-way brake valve 3 and the shuttle valve to push the relay valve 8 to act, and the oil in the rear brake energy accumulator 1 enters the rear axle service brake through the relay valve 8 and the displacement compensation valve 7 to implement service braking; when loading and unloading, when the loading brake valve 4 is electrified, pressure oil is applied to a pilot port of the relay valve 8 through the loading brake valve 4, and after the relay valve 8 acts, the pressure oil is applied to a rear axle traveling brake 6 through the relay valve 8 and the displacement compensation valve 7 to implement loading brake; when the double-path brake valve 3 fails and loses the braking function in the running process, when the loading brake valve 4 is electrified, pressure oil is applied to a pilot port of the relay valve 8 through the loading brake valve 4, and after the relay valve 8 acts, the pressure oil is applied to a rear axle service brake through the relay valve and the displacement compensation valve and can be used as an auxiliary braking system to stop a vehicle.
Example two:
as shown in fig. 2, for the structure that wet brakes are assembled on both the front axle and the rear axle of the system, oil inlets of a front axle brake 5 and a rear axle service brake 6 are respectively connected with a displacement compensation valve 7, and an oil inlet of the displacement compensation valve 7 of the compensation front axle is connected with an oil port a of a front axle brake valve of a two-way brake valve; an oil inlet of a displacement compensation valve 7 of the compensation rear axle is connected with an oil port A2 of a relay valve 8.
The working principle of the embodiment is as follows: the driver steps on the brake pedal, the oil in the front brake energy accumulator enters the front axle service brake 5 through the two-way brake valve 3 and the displacement compensation valve 7, the oil in the rear brake energy accumulator 1 reaches a pilot port of the relay valve 8 through the two-way brake valve 3 and the shuttle valve to push the relay valve 8 to act, and the oil in the rear brake energy accumulator 1 enters the rear axle service brake 6 through the relay valve 8 and the displacement compensation valve 7 to implement service braking; when loading and unloading, when the loading brake valve 4 is electrified, pressure oil is applied to a pilot port of the relay valve 8 through the loading brake valve 4, and after the relay valve 8 acts, the pressure oil is applied to a rear axle service brake through the relay valve 8 and the displacement compensation valve 7 to implement loading brake; when the two-way brake valve 3 fails and loses the braking function in the running process, when the load brake valve is powered 4, pressure oil is applied to a pilot port of the relay valve 8 through the load brake valve 4, and after the relay valve 8 acts, the pressure oil is applied to a rear axle running brake 6 through the relay valve 8 and the displacement compensation valve 7 and can be used as an auxiliary braking system to stop a vehicle.
Claims (1)
1. The utility model provides a mining dump truck hydraulic braking system, includes rear braking energy storage ware (1), preceding braking energy storage ware (2), double-circuit brake valve (3), loading brake valve (4), front axle service brake (5), rear axle service brake (6), relay valve (8), its characterized in that: an oil inlet of the front axle service brake (5) or the rear axle service brake (6) is connected with an oil outlet of the displacement compensation valve (7); when the displacement compensation valve (7) is used for compensating the front axle service brake (5), an oil inlet of the displacement compensation valve is connected with an oil port A of a front axle brake valve of the two-way brake valve; when the displacement compensation valve (7) is used for compensating the rear axle service brake (6), the oil inlet of the displacement compensation valve is connected with the A2 oil port of the relay valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930564.5U CN210113154U (en) | 2018-11-22 | 2018-11-22 | Hydraulic braking system of mining dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930564.5U CN210113154U (en) | 2018-11-22 | 2018-11-22 | Hydraulic braking system of mining dump truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210113154U true CN210113154U (en) | 2020-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821930564.5U Active CN210113154U (en) | 2018-11-22 | 2018-11-22 | Hydraulic braking system of mining dump truck |
Country Status (1)
| Country | Link |
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| CN (1) | CN210113154U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114162101A (en) * | 2021-12-24 | 2022-03-11 | 中车大同电力机车有限公司 | Hydraulic braking system and mining dump truck |
-
2018
- 2018-11-22 CN CN201821930564.5U patent/CN210113154U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114162101A (en) * | 2021-12-24 | 2022-03-11 | 中车大同电力机车有限公司 | Hydraulic braking system and mining dump truck |
| CN114162101B (en) * | 2021-12-24 | 2022-09-30 | 中车大同电力机车有限公司 | Hydraulic braking system and mining dump truck |
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