Loader brake system

Abstract

The utility model provides a kind of loader braking system, belong to loader technical field, including hydraulic oil tank, the hydraulic oil tank oil outlet is connected with brake pump by pipeline, the oil outlet of brake pump is connected with the oil inlet of liquid filling valve by pipeline, filter is provided on pipeline between brake pump and liquid filling valve, the oil outlet of liquid filling valve is connected with the oil inlet of foot valve by oil pipe, the oil outlet of foot valve is connected with front axle brake and rear axle brake respectively, the oil pipe between liquid filling valve and foot valve is all connected with energy accumulator, wherein, filter, energy accumulator and liquid filling valve are all located in electric appliance box.The utility model is arranged in electric appliance box by each hydraulic component of brake system, when overhauling brake system, does not need to climb, improves the overhauling efficiency of large loader braking system.

Description

Technical Field

[0001] This utility model belongs to the field of loader technology, and in particular relates to a loader braking system. Background Technology

[0002] Large loaders (engine power greater than 200 horsepower) are often used in mining. Due to the limited working space, they need to brake frequently. To meet the braking requirements of large loaders, full hydraulic braking is usually adopted.

[0003] Fully hydraulic braking uses hydraulic oil as the medium, and connects various hydraulic components such as hydraulic oil tank, brake pump, filter, filling valve, accumulator, and brake valve through oil pipes. It uses hydraulic power to brake and park.

[0004] Large loaders are large in size, and existing large loaders have various hydraulic components of the braking system located in different parts of the machine. When inspecting and maintaining the braking system of a large loader, it is necessary to climb to different locations on the large loader, which is not only time-consuming and labor-intensive, but also poses safety hazards and seriously affects the maintenance efficiency of the braking system. Utility Model Content

[0005] To address the deficiencies or shortcomings in existing technologies, this utility model provides a loader braking system. By arranging the hydraulic components of the braking system inside an electrical box, maintenance of the braking system can be performed without climbing, thus improving the maintenance efficiency of large loader braking systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An embodiment of this utility model provides a loader braking system, including a hydraulic oil tank. The outlet of the hydraulic oil tank is connected to a brake pump via a pipe. The outlet of the brake pump is connected to the inlet of a filling valve via a pipe. A filter is installed on the pipe between the brake pump and the filling valve. The outlet of the filling valve is connected to the inlet of a foot valve via an oil pipe. The outlet of the foot valve is connected to the front axle brake and the rear axle brake respectively. An accumulator is connected to the oil pipe between the filling valve and the foot valve. The filter, accumulator, and filling valve are all located in an electrical box.

[0008] Furthermore, the brake pump is connected in series with the working pump, and the working pump is connected to the power take-off port of the gearbox.

[0009] Furthermore, the A1 and A2 oil outlets of the filling valve are connected to the P2 and P1 oil inlets of the foot valve respectively via oil pipes, and the A2 and A1 oil outlets of the foot valve are connected to the front axle brake and the rear axle brake respectively.

[0010] Furthermore, the A2 outlet of the filling valve is also connected to the inlet of the parking brake valve via an oil pipe, and the outlet of the parking brake valve is connected to the front axle brake. The parking brake valve is located in the electrical box.

[0011] Furthermore, accumulators are connected to the oil pipes between the A1 and A2 oil outlets of the filling valve and the foot valve.

[0012] Furthermore, the foot valve includes a brake foot valve and an auxiliary foot valve. The auxiliary foot valve is connected to the brake foot valve via an oil pipe, and the brake foot valve and the auxiliary foot valve are arranged side by side at the bottom of the cab.

[0013] Furthermore, the electrical box and the hydraulic oil tank are symmetrically arranged and fixed on the left and right sides of the front end of the rear frame, respectively.

[0014] Furthermore, the filter is arranged at the bottom of the electrical box, and the electrical box has an access port at the corresponding position of the filter, with an access plate on the access port.

[0015] Furthermore, the accumulator is fixed to the inner wall of the middle part of the electrical box, and a base plate is provided inside the middle part of the electrical box. A fixing block is fixed to the base plate by bolts, and the accumulator is fixedly connected to the base plate by the fixing block.

[0016] Furthermore, a mounting plate is provided in the middle of the electrical box. The mounting plate is fixed to the side of the electrical box away from its inner wall. The filling valve and the parking brake valve are fixed to the mounting plate side by side by bolts.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model places the filter, accumulator, filling valve and parking brake valve in the electrical box, and the electrical box and hydraulic oil tank are placed symmetrically, which facilitates the maintenance of the braking system. It eliminates the need to climb to different positions of the large loader, reduces safety hazards and improves the maintenance efficiency of the braking system of the large loader.

[0019] 2. In this utility model, the filter is placed in the middle of the electrical box. The electrical box has an inspection port at the corresponding position of the filter. The inspection port is equipped with an inspection plate. When it is necessary to repair the filter or replace the filter element, it is only necessary to remove the inspection plate on the inspection port, which makes repair and replacement convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the braking system structure in an embodiment of the present invention;

[0021] Figure 2 This is a diagram showing the positional relationship between the hydraulic oil tank and the electrical box in an embodiment of this utility model;

[0022] Figure 3 This is a diagram showing the positional relationship of the components of the braking system in this embodiment of the present invention;

[0023] Figure 4 This is a structural diagram of the internal structure of the electrical box in an embodiment of this utility model;

[0024] The components include: 1. Hydraulic oil tank; 2. Brake pump; 3. Filter; 4. Accumulator; 5. Filling valve; 6. Parking brake valve; 7. Foot valve; 71. Brake foot valve; 72. Auxiliary foot valve; 8. Rear frame; 9. Inspection plate; 10. Electrical box; 11. Seat plate; 12. Fixing block. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] A typical embodiment of this utility model is as follows: Figure 1 As shown, a loader braking system includes a hydraulic oil tank 1, a brake pump 2, a filter 3, an accumulator 4, a filling valve 5, a parking brake valve 6, and a foot valve 7. The hydraulic oil tank 1, brake pump 2, filter 3, accumulator 4, filling valve 5, parking brake valve 6, and foot valve 7 are all connected by oil pipes.

[0027] The outlet of the hydraulic oil tank 1 is connected to the brake pump 2 through a pipeline. In this embodiment, the internal pressure of the hydraulic oil tank 1 is maintained at about 0.6 bar to ensure the suction pressure of the brake pump 2 pump port and prevent cavitation caused by insufficient pressure. The brake pump 2 is a gear pump and is the power source of the entire braking system, supplying the hydraulic oil in the hydraulic oil tank 1 to the required position.

[0028] Since the loader has many hydraulic pumps, but the power take-off ports provided by the engine and transmission are limited, the brake pump 2 is connected in series after the working pump. The working pump is connected to the power take-off port of the transmission, so that the brake pump 2 is driven by the transmission. In this embodiment, the brake pump 2 and the circulation pump are a double gear pump connected in series with the working pump. The circulation pump is connected to the hydraulic oil tank 1 and the radiator through a pipeline. The oil in the loader's hydraulic oil tank 1 will circulate between the hydraulic oil tank 1 and the radiator under the drive of the circulation pump to maintain a suitable hydraulic oil temperature.

[0029] The outlet of the brake pump 2 is connected to the inlet of the filling valve 5 through a pipe. A filter 3 is installed on the pipe between the brake pump 2 and the filling valve 5. The filter 3 mainly purifies the oil in the entire system and prevents components such as the brake foot valve 71 and the filling valve 5 from becoming clogged. The filter 3 integrates a signal generator, which will send a signal when the filter 3 becomes clogged to a certain extent, warning the user to replace the filter element in time.

[0030] The filling valve 5 is an important component of the service brake, mainly used for oil switching and controlling the maximum pressure of the braking system. It connects the braking system and the hydraulic control system. When the pressure of the braking system reaches about 130 bar, it will stop supplying oil to the braking system and switch to supplying oil to the hydraulic control system. When the pressure of the filling valve 5 reaches 180 bar, the safety valve opens to release pressure.

[0031] The A1 and A2 oil outlets of the filling valve 5 are connected to the P2 and P1 oil inlets of the foot valve 7 respectively via oil pipes. The A2 and A1 oil outlets of the foot valve 7 are connected to the front axle brake and the rear axle brake respectively. The foot valve 7 includes a brake foot valve 71 and an auxiliary foot valve 72. The brake foot valve 71 can control the connection and disconnection of the pressure oil. By pressing down the pedal, the internal valve core is opened, and the pressure oil will be delivered to the front axle and the rear axle through the internal channel of the brake foot valve 71 to achieve service braking. The pressure formed by pressing down the pedal is positively correlated with the braking pressure.

[0032] The auxiliary foot valve 72 is connected to the brake foot valve 71 through an oil pipe, and plays the role of assisting braking. When the auxiliary foot valve 72 is pressed, the valve core inside the auxiliary foot valve 72 moves down, and the pressure oil is transmitted to the brake foot valve 71 through the internal channel of the valve core, pushing the valve core of the brake foot valve 71 to move down, simulating the working state of the foot brake valve 71.

[0033] The brake foot valve 71 and the auxiliary foot valve 72 are respectively located at the bottom of the cab and are arranged side by side, so that both the left and right feet can step on the brake pedal, increasing the safety of operation.

[0034] The A2 outlet of the filling valve 5 is also connected to the inlet of the parking brake valve 6 via an oil pipe. The outlet of the parking brake valve 6 is connected to the front axle brake. The parking brake valve 6 cuts off the supply of pressurized oil to the front axle when the vehicle stops operating, thereby realizing parking braking.

[0035] An accumulator 4 is connected to the oil pipe between the A1 and A2 oil outlets of the filling valve 5 and the foot valve 7. In this embodiment, the accumulator 4 is a piston-type accumulator. The accumulator 4 is used for energy storage to provide pressure for parking braking after the vehicle stops. At the same time, it also serves as an emergency energy source for service braking.

[0036] For ease of maintenance of the braking system, the filter 3, accumulator 4, filling valve 5, and parking brake valve 6 are all located in the electrical box 10. Figure 2 As shown, the electrical box 10 and the hydraulic oil tank 1 are symmetrically arranged and fixed on the left and right sides of the front end of the rear frame 8, thereby increasing the overall coordination of the vehicle.

[0037] Among them, such as Figure 3 and Figure 4As shown, the filter 3 is arranged at the lower part of the electrical box 10. The electrical box 10 has an inspection port at the corresponding position of the filter 3. The inspection port is equipped with an inspection plate 9, which is bolted to the inspection port. When it is necessary to repair or replace the filter element of the filter 3, it is only necessary to remove the inspection plate 9 on the inspection port, which makes repair and replacement convenient.

[0038] Because the accumulator 4 is relatively heavy, it is fixed to the inner wall of the middle part of the electrical box 10. Specifically, a base plate 11 is provided on the inner wall of the middle part of the electrical box 10, and a fixing block 12 is fixed to the base plate 11 by bolts. The accumulator 4 is fixedly connected to the base plate 11 through the fixing block 12, thereby ensuring the stability of the accumulator 4 installation.

[0039] A mounting plate is also provided in the middle of the electrical box. The mounting plate is fixed on the side of the electrical box away from its inner wall. The filling valve and the parking brake valve are fixed to the mounting plate side by side by bolts, thereby ensuring the stability of the filling valve and the parking brake valve.

[0040] This invention places the filter, accumulator, filling valve, and parking brake valve all in the electrical box, and the electrical box and hydraulic oil tank are placed symmetrically, which facilitates the maintenance of the braking system without having to climb to different positions on the large loader, reducing safety hazards and improving the maintenance efficiency of the large loader's braking system.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A loading mechanism braking system, characterized in that, The system includes a hydraulic oil tank, the outlet of which is connected to a brake pump via a pipe. The outlet of the brake pump is connected to the inlet of a filling valve via a pipe. A filter is installed on the pipe between the brake pump and the filling valve. The outlet of the filling valve is connected to the inlet of a foot valve via an oil pipe. The outlet of the foot valve is connected to the front axle brake and the rear axle brake respectively. An accumulator is connected to the oil pipe between the filling valve and the foot valve. The filter, accumulator, and filling valve are all located in an electrical box.

2. The loading mechanism braking system as described in claim 1, characterized in that, The brake pump is connected in series with the working pump, and the working pump is connected to the power take-off port of the gearbox.

3. A loading mechanism braking system as described in claim 1, characterized in that, The A1 and A2 oil outlets of the filling valve are connected to the P2 and P1 oil inlets of the foot valve respectively via oil pipes. The A2 and A1 oil outlets of the foot valve are connected to the front axle brake and the rear axle brake respectively.

4. A loading mechanism braking system as described in claim 3, characterized in that, The A2 outlet of the filling valve is also connected to the inlet of the parking brake valve via an oil pipe. The outlet of the parking brake valve is connected to the front axle brake. The parking brake valve is located in the electrical box.

5. A loading mechanism braking system as described in claim 3, characterized in that, Accumulators are connected to the oil pipes between the A1 and A2 oil outlets of the filling valve and the foot valve.

6. A loading mechanism braking system as described in claim 1, characterized in that, The foot valve includes a brake foot valve and an auxiliary foot valve. The auxiliary foot valve is connected to the brake foot valve through an oil pipe. The brake foot valve and the auxiliary foot valve are arranged side by side at the bottom of the cab.

7. A loading mechanism braking system as described in claim 1, characterized in that, The electrical box and the hydraulic oil tank are symmetrically arranged and fixed on the left and right sides of the front end of the rear frame, respectively.

8. A loading mechanism braking system as described in claim 1, characterized in that, The filter is located at the bottom of the electrical box, and the electrical box has an access port at the corresponding position of the filter, with an access plate on the access port.

9. A loading mechanism braking system as described in claim 1, characterized in that, The accumulator is fixed to the inner wall of the middle part of the electrical box. A base plate is provided inside the middle part of the electrical box. A fixing block is fixed to the base plate by bolts. The accumulator is fixedly connected to the base plate by the fixing block.

10. A loading mechanism braking system as described in claim 1, characterized in that, An installation plate is also provided in the middle of the electrical box. The installation plate is fixed to the side of the electrical box away from its inner wall. The filling valve and the parking brake valve are fixed to the installation plate side by side by bolts.

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