CN219295383U

CN219295383U - Auxiliary emergency braking system of loader

Info

Publication number: CN219295383U
Application number: CN202320166933.2U
Authority: CN
Inventors: 王凯; 董立队; 任清坡; 张学强; 姚运飞
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2023-02-03
Filing date: 2023-02-03
Publication date: 2023-07-04
Anticipated expiration: 2033-02-03

Abstract

The utility model discloses an auxiliary emergency braking system of a loader, and belongs to the technical field of engineering machinery. The method solves the defects that in the prior art, the emergency braking of the parking braking of the traditional loader has performance attenuation along with the increase of the using times, so that the emergency braking distance is longer, and the braking safety performance is poor. The main structure of the hydraulic braking device comprises an air compressor, a braking electromagnetic valve, a pedal valve, a shuttle valve and a booster pump, wherein the air compressor is connected with the pedal valve through an air storage tank, an A port of the shuttle valve is connected with the pedal valve, a B port of the shuttle valve is connected with the booster pump, the booster pump is connected with a braking piston, a C port of the shuttle valve is connected with a C1 port of the braking electromagnetic valve, a D port of the braking electromagnetic valve is connected with an air outlet of the air storage tank, and an electromagnetic signal end of the braking electromagnetic valve is further connected with a first switch. The utility model is mainly used for engineering machinery such as a loader and the like.

Description

Auxiliary emergency braking system of loader

Technical Field

The utility model belongs to the technical field of engineering machinery, and particularly relates to an auxiliary emergency braking system of a loader.

Background

The parking brake of the existing loader is generally used as emergency brake, when the pressure of the air storage tank is lower than a certain pressure, the first air storage tank pressure switch is turned off, the parking brake electromagnetic valve is powered off, the air in the spring air chamber is discharged, and the emergency brake of the whole loader is realized under the operation of spring force.

In the prior art, as shown in fig. 2, when the whole machine works, an air compressor 1 starts to supply air to a system, the air is cleaned and limited by an oil-water separator 2, and enters an air storage tank 8, the air storage tank is protected by a safety valve 3, and when a pedal valve 12 performs service braking, pedal gas is stepped on to a booster pump 14 through the pedal valve, and high-pressure oil is output to a brake piston 15, so that service braking is realized; when the pressure of the air storage tank is lower than 0.45MPa, the first air storage tank pressure switch is turned off, the parking brake electromagnetic valve 7 is powered off, the air in the spring air chamber 6 is discharged, and the emergency braking of the whole machine is realized under the operation of spring force.

However, the prior proposal has the technical defects that: when the engine fails or the pressure of the air cylinder is reduced to a certain value, the whole machine triggers the parking brake to realize emergency braking, but the emergency braking is attenuated along with the increase of the using times, so that the emergency braking distance is longer, the braking safety performance is poor, and if the emergency braking fails, the effective braking cannot be realized.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art, and provides an auxiliary emergency braking system of a loader, which is characterized in that when the pressure of an air storage tank is low or the engine oil pressure is low or the engine fails to trigger parking braking, a braking electromagnetic valve also works simultaneously, and the braking distance can be effectively shortened through auxiliary emergency braking of service braking, so that a better emergency braking effect is realized.

In order to achieve the above purpose, the present utility model is realized by adopting the following technical scheme:

the utility model provides a loader auxiliary emergency braking system, includes air compressor machine, braking solenoid valve, pedal valve, shuttle valve and booster pump, the air compressor machine passes through the gas holder and is connected with the pedal valve, the A mouth of shuttle valve is connected with the pedal valve, and the B mouth is connected with the booster pump, and the booster pump is connected with the braking piston, and the C mouth is connected with the C1 mouth of braking solenoid valve, and the D mouth of braking solenoid valve is connected with the gas outlet of gas holder, and the electromagnetic signal end of braking solenoid valve still is connected with first all disconnections.

Preferably, the air storage tank is further connected with the spring air chamber through a parking brake electromagnetic valve, and an electromagnetic signal end of the parking brake electromagnetic valve is further connected with a second disconnecting switch.

Preferably, the second cut-off switch is a first oil pressure switch and a first air tank pressure switch connected in series with each other.

Preferably, the first cut-off switch is a second oil pressure switch and a second air tank pressure switch connected in parallel with each other.

Preferably, an oil-water separator is arranged between the air compressor and the air storage tank.

Preferably, the air storage tank is also connected with a safety valve.

Compared with the prior art, the utility model has the beneficial effects that:

1. when the air pressure of the air storage tank or the engine oil pressure is low, the second oil pressure switch is closed or the second air storage tank pressure switch is closed, the brake electromagnetic valve is electrified, high-pressure air of the air storage tank is introduced into a booster pump for service braking through a port C and a port B of the shuttle valve and then enters a brake piston connected with the booster pump, so that service braking is realized, and a better emergency braking effect is realized;

2. the first engine oil pressure switch and the first air storage tank pressure switch are used as inputs, when the air storage tank pressure is low, the first air storage tank pressure switch is disconnected, when the engine oil pressure is low, the first engine oil pressure switch is disconnected, if one of the two switches is disconnected, the parking brake electromagnetic valve is powered off, and the spring air chamber is exhausted, so that parking brake is realized;

in summary, when the pressure of the air storage tank is reduced or the engine oil pressure is reduced to a certain value or the engine failure triggers the parking brake, the brake solenoid valve also works simultaneously, and the braking distance can be effectively shortened by auxiliary emergency braking of the service brake, so that a better emergency braking effect is realized, namely, the driving and the parking are used as the emergency braking together, and the safety of the whole vehicle system is protected.

Drawings

FIG. 1 is a schematic diagram of the present utility model;

fig. 2 is a schematic diagram of the prior art.

In the figure: 1. an air compressor; 2. an oil-water separator; 3. a safety valve; 4. a first oil pressure switch; 5. a first air tank pressure switch; 6. a spring air chamber; 7. a parking brake solenoid valve; 8. a gas storage tank; 9. a second oil pressure switch; 10. a second air tank pressure switch; 11. a brake solenoid valve; 12. a pedal valve; 13. a shuttle valve; 14. a booster pump; 15. and a brake piston.

Detailed Description

The utility model will now be further illustrated by means of specific examples in connection with the accompanying drawings.

Example 1:

as shown in fig. 1, the auxiliary emergency braking system of the loader comprises an air compressor 1, a braking electromagnetic valve 11, a pedal valve 12, a shuttle valve 13 and a booster pump 14, wherein the air compressor 1 is connected with the pedal valve 12 through an air storage tank 8, an A port of the shuttle valve 13 is connected with the pedal valve 12, a B port is connected with the booster pump 14, the booster pump 14 is further connected with a braking piston 15, a C port is connected with a C1 port of the braking electromagnetic valve 11, a D port of the braking electromagnetic valve 11 is connected with an air outlet of the air storage tank 8, and an electromagnetic signal end of the braking electromagnetic valve 11 is further connected with a first switch.

Example 2:

the auxiliary emergency braking system of the loader is characterized in that the air storage tank 8 is further connected with the spring air chamber 6 through the parking braking electromagnetic valve 7, and an electromagnetic signal end of the parking braking electromagnetic valve 7 is further connected with the second disconnecting switch. The other parts are the same as in example 1.

Example 3:

the second disconnecting switch is a first engine oil pressure switch 4 and a first air storage tank pressure switch 5 which are connected in series, the first engine oil pressure switch 4 is installed on an engine, and the first air storage tank pressure switch 5 is installed on an air storage tank 8. When the pressure of the air storage tank 8 is low or the engine oil pressure is too low, the first oil pressure switch 4 is disconnected or the first air storage tank pressure switch 5 is disconnected, the parking brake electromagnetic valve 7 is powered off, the parking brake electromagnetic valve 7 is switched over, the air in the spring air chamber 6 is discharged, and the air chamber spring pushes the parking to start working, so that the parking brake is realized. The other portions are the same as in example 2.

Example 4:

the first cut-off switch is a second engine oil pressure switch 9 and a second air storage tank pressure switch 10 which are connected in parallel, the second engine oil pressure switch 9 is arranged on an engine, and the second air storage tank pressure switch 10 is arranged on the air storage tank 8. The pressure switch is adopted for detection, and when the pressure of the air storage tank 8 is reduced or the engine oil pressure is reduced to a certain value, the parking brake and the service brake are triggered to work together, so that the performance of emergency braking is improved.

An oil-water separator 2 is arranged between the air compressor 1 and the air storage tank 8, and the air storage tank 8 is also connected with the safety valve 3. The other portions are the same as in example 3.

The working principle of example 4 is:

as shown in fig. 1, when the whole machine works, the air compressor 1 supplies air, the working pressure of the system is controlled by the oil-water separator 2, after the air reaches the air storage tank 8, the safety valve 3 is arranged on the air storage tank 8 and used for protecting the air storage tank 8, when the running brake is carried out, the pedal valve 12 is stepped down, the air is output from the opening B of the shuttle valve 13 to the opening A of the shuttle valve 13 through the pedal valve 12, and then the air is output to the booster pump 14, and high-pressure oil is output to the brake piston 15, so that the running brake is realized; when the engine fails and the engine does not work, the engine oil pressure can be reduced, the second engine oil pressure switch 9 is closed, the brake electromagnetic valve 11 starts to be electrified, gas from the gas storage tank 8 reaches the C port of the shuttle valve 13 through the brake electromagnetic valve 11, then is input into the booster pump 14 through the B port of the shuttle valve 13, and finally high-pressure oil is output to the brake piston 15, so that service braking is realized, meanwhile, the first engine oil pressure switch 4 can be powered off due to low engine oil pressure, the parking brake electromagnetic valve 7 is powered off, the gas of the spring air chamber 6 is discharged, and emergency braking of the whole machine is realized under the operation of a spring.

Because the pressure in the air storage tank 8 is connected to the brake electromagnetic valve 11, when an emergency braking condition is met, such as that the pressure of the air storage tank 8 is low or the engine oil pressure is too low, the second oil pressure switch 9 is closed or the second air storage tank pressure switch 10 is closed, the brake electromagnetic valve 11 is switched over, the air in the air storage tank 8 passes through the brake electromagnetic valve 11 to reach the C port of the shuttle valve 13, and then is input to the booster pump 14 through the B port of the shuttle valve 13, and the booster pump 14 outputs high-pressure oil to the brake piston 15, so that service braking is realized; meanwhile, when the pressure of the air storage tank 8 is low or the engine oil pressure is too low, the first oil pressure switch 4 is disconnected or the first air storage tank pressure switch 5 is disconnected, the parking brake electromagnetic valve 7 is powered off, the parking brake electromagnetic valve 7 is switched over, the air in the spring air chamber 6 is discharged, the air chamber spring pushes the parking to start working, and the parking brake is realized, so that the simultaneous working of the service brake and the parking brake is realized, and the braking capability is improved.

Claims

1. A loader-assisted emergency braking system, characterized by: including air compressor machine (1), braking solenoid valve (11), pedal valve (12), shuttle valve (13) and booster pump (14), air compressor machine (1) are connected with pedal valve (12) through gas holder (8), the A mouth of shuttle valve (13) is connected with pedal valve (12), and the B mouth is connected with booster pump (14), and the C mouth is connected with the C1 mouth of braking solenoid valve (11), and the D mouth of braking solenoid valve (11) is connected with the gas outlet of gas holder (8), and the electromagnetic signal end of braking solenoid valve (11) still is connected with first switch-off.

2. The loader-assisted emergency braking system of claim 1, wherein: the air storage tank (8) is further connected with the spring air chamber (6) through the parking brake electromagnetic valve (7), and an electromagnetic signal end of the parking brake electromagnetic valve (7) is further connected with the second cut-off switch.

3. The loader-assisted emergency braking system of claim 2, wherein: the second cut-off switch is a first engine oil pressure switch (4) and a first air storage tank pressure switch (5) which are connected in series.

4. A loader-assisted emergency braking system according to claim 3, wherein: the first disconnecting switch is a second engine oil pressure switch (9) and a second air storage tank pressure switch (10) which are connected in parallel.

5. The loader auxiliary emergency braking system according to any of claims 1-4, wherein: an oil-water separator (2) is arranged between the air compressor (1) and the air storage tank (8).

6. The loader auxiliary emergency braking system of claim 5, wherein: the air storage tank (8) is also connected with the safety valve (3).