Parking braking system and engineering vehicle

Abstract

The utility model discloses a parking brake system and an engineering vehicle. The parking brake system comprises an air compressor, a dryer with four loops, a parking air cylinder, a one-way valve, a hand brake valve, a relay valve and a brake chamber. The air compressor is connected with the dryer with the four loops through an air pipe, and the dryer with the four loops is connected with an air inlet of the parking air cylinder through an air pipe. An air inlet of the one-way valve is installed at an air outlet of a parking air cylinder through a connector, and an air outlet of the one-way valve is connected with an air inlet of the hand brake valve and an air inlet of the relay valve through air pipes to supply energy to a parking brake loop. An air outlet of the hand brake valve is connected with a control port of the relay valve through an air pipe, and an air outlet of the relay valve is connected with an air inlet of the brake air chamber through an air pipe. According to the utility model, the one-way valve is additionally arranged behind the air cylinder in the original brake circuit and is used for preventing brake dragging abrasion caused by incomplete parking brake release due to the influence of the reduction of the air pressure of the whole vehicle.

Description

Technical Field

[0001] This utility model relates to a parking brake system and belongs to the technical field of mining dump trucks. Background Technology

[0002] The existing parking air brake circuit for mining dump trucks consists of an air compressor, a four-circuit dryer, an air reservoir, a handbrake valve, a relay valve, and a brake chamber. As mining dump trucks develop towards larger tonnage units, higher demands are placed on parking braking force. The parking air brake circuit for mining dump trucks suffers from drawbacks, including the air pressure in the parking brake circuit being affected by the overall vehicle air pressure drop, incomplete release of the parking brake, and dragging wear on drum brakes. These drawbacks are caused by the air pressure in the parking brake circuit being affected by the overall vehicle air pressure decrease. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a parking brake system that adds a one-way valve after the air reservoir in the original brake circuit. This valve is used to prevent incomplete release of the parking brake due to a drop in the overall vehicle air pressure, which could lead to brake drag.

[0004] This utility model is achieved according to the following technical solution:

[0005] In a first aspect, this utility model provides a parking brake system, including an air compressor, a four-circuit dryer, a parking air reservoir, a one-way valve, a handbrake valve, a relay valve, and a brake chamber; the air compressor is connected to the four-circuit dryer via an air pipe, and the four-circuit dryer is connected to the air inlet of the parking air reservoir via an air pipe; the air inlet of the one-way valve is installed at the air outlet of the parking air reservoir via a connector, and the air outlet of the one-way valve is connected to the air inlet of the handbrake valve and the air inlet of the relay valve via air pipes to supply power to the parking brake circuit; the air outlet of the handbrake valve is connected to the control port of the relay valve via an air pipe, and the air outlet of the relay valve is connected to the air inlet of the brake chamber via an air pipe.

[0006] In some embodiments, a low-pressure alarm switch is connected in series in the air pipe between the air outlet of the handbrake valve and the control port of the relay valve. When the air pressure entering the relay valve is lower than a preset value when the handbrake valve is turned on, the low-pressure alarm switch will sound an alarm.

[0007] In some embodiments, the number of brake chambers is six, with two brake chambers forming a group. The two brake chambers of the first group are arranged on the front axle, the two brake chambers of the second group are arranged on the middle axle, and the two brake chambers of the third group are arranged on the rear axle.

[0008] In some embodiments, the relay valve is installed near the middle bridge; a quick-release valve is connected between the two brake chambers of the first group and between the two brake chambers of the third group, and the two quick-release valves are connected to the relay valve to accelerate the release speed of the brake chambers towards the relay valve.

[0009] Secondly, this utility model provides an engineering vehicle, including the aforementioned parking brake system.

[0010] In some embodiments, the engineering vehicle includes a mining dump truck.

[0011] The beneficial effects of this utility model are:

[0012] A one-way valve is added after the air reservoir in the existing parking brake circuit to prevent incomplete release of the parking brake, brake wear, and reduced driving power due to a drop in overall vehicle air pressure during vehicle operation. This reduces the brake failure rate during vehicle operation, improving driving safety and lowering overall vehicle operating costs. Attached Figure Description

[0013] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0014] In the attached diagram:

[0015] Figure 1 This is a schematic diagram of the parking brake system of this utility model.

[0016] Attached diagram labels: 1. Air compressor, 2. Dryer with four circuits, 3. Parking air tank, 4. Check valve, 5. Hand brake valve, 6. Relay valve, 7. Brake chamber, 8. Low pressure alarm switch, 9. Quick release valve.

[0017] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0019] like Figure 1As shown, a parking brake system includes an air compressor 1, a four-circuit dryer 2, a parking air reservoir 3, a one-way valve 4, a handbrake valve 5, a relay valve 6, and a brake chamber 7. The air compressor 1 is connected to the four-circuit dryer 2 via an air pipe, and the four-circuit dryer 2 is connected to the air inlet of the parking air reservoir 3 via an air pipe. The air inlet of the one-way valve 4 is installed at the air outlet of the parking air reservoir 3 via a connector, and the air outlet of the one-way valve 4 is connected to the air inlet of the handbrake valve 5 and the air inlet of the relay valve 6 via air pipes to supply power to the parking brake circuit. The air outlet of the handbrake valve 5 is connected to the control port of the relay valve 6 via an air pipe, and the air outlet of the relay valve 7 is connected to the air inlet of the brake chamber 7 via an air pipe.

[0020] Further plans will continue to be considered. Figure 1 As shown, a low-pressure alarm switch 8 is connected in series in the air pipe between the air outlet of the handbrake valve 5 and the control port of the relay valve 6. When the handbrake valve 5 is turned on, if the air pressure entering the relay valve 6 is lower than the preset value, the low-pressure alarm switch 8 will sound an alarm.

[0021] Further plans will continue to be considered. Figure 1 As shown, there are six brake chambers 7, with each group consisting of two brake chambers 7. The first group of two brake chambers 7 is located on the front axle, the second group of two brake chambers 7 is located on the middle axle, and the third group of two brake chambers 7 is located on the rear axle.

[0022] Further plans will continue to be considered. Figure 1 As shown, the relay valve 6 is installed near the middle axle; a quick-release valve 9 is connected between the two brake chambers 7 of the first group and between the two brake chambers 7 of the third group. The two quick-release valves 9 are connected to the relay valve 6 to accelerate the release speed of the brake chambers 7 to the relay valve 6, thereby applying the parking brake more quickly.

[0023] Work process: such as Figure 1 As shown, air compressor 1 compresses atmospheric air into high-pressure gas, which is then dried by a four-circuit dryer 2 and stored in the parking air reservoir 3. The inlet of one-way valve 4 is connected to the outlet of parking air reservoir 3 via a connector, maintaining the air pressure in the parking brake circuit and preventing pressure drops in parking air reservoir 3 during vehicle operation. The outlet of one-way valve 4 connects to the inlets of handbrake valve 5 and relay valve 6, supplying power to the parking brake circuit. The outlet of handbrake valve 5 connects to the control port of relay valve 6, and the outlet of relay valve 6 connects to the inlet of brake chamber 7. When handbrake valve 5 is closed, the air pressure at the control port of relay valve 6 rises, and high-pressure gas enters brake chamber 7 through relay valve 6, releasing the parking brake. When handbrake valve 5 is open, the air pressure at the control port of relay valve 6 drops, and high-pressure gas is discharged from the exhaust port of relay valve 6, applying the parking brake.

[0024] In summary, this utility model provides a parking brake system that adds a one-way valve after the air reservoir in the original parking brake circuit. This prevents incomplete release of the parking brake, brake wear, and reduced driving power due to the decrease in overall vehicle air pressure during vehicle operation. The reduced brake failure rate during vehicle operation contributes to vehicle safety and lowers overall vehicle operating costs.

[0025] The engineering vehicle provided by this utility model is described below. The engineering vehicle described below can be referred to in correspondence with the parking brake system described above.

[0026] The present invention provides an engineering vehicle that may include a parking brake system as described in any of the above embodiments.

[0027] The beneficial effects achieved by the engineering vehicle provided by this utility model are consistent with the beneficial effects achieved by the parking brake system provided by this utility model, so they will not be repeated here.

[0028] It should be noted that the aforementioned engineering vehicles can be mining dump trucks.

[0029] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0030] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A parking brake system, characterized in that: it comprises an air compressor, a four-loop dryer, a parking reservoir, a check valve, a hand brake valve, a relay valve and brake chambers; the air compressor is connected to the four-loop dryer through an air pipe, and the four-loop dryer is connected to the air inlet of the parking reservoir through an air pipe; the air inlet of the check valve is installed on the air outlet of the parking reservoir through a joint, and the air outlet of the check valve is connected to the air inlets of the hand brake valve and the relay valve through air pipes to supply energy to the parking brake circuit; the air outlet of the hand brake valve is connected to the control port of the relay valve through an air pipe, and the air outlet of the relay valve is connected to the air inlets of the brake chambers through an air pipe.

2. The parking brake system according to claim 1, characterized in that: a low-pressure alarm switch is connected in series in the air pipe between the air outlet of the hand brake valve and the control port of the relay valve, and the low-pressure alarm switch sends an alarm when the air pressure entering the relay valve is lower than the preset value when the hand brake valve is turned on.

3. The parking brake system according to claim 1, characterized in that: the number of brake chambers is six, and each two brake chambers form a group, the two brake chambers of the first group are arranged on the front axle, the two brake chambers of the second group are arranged on the middle axle, and the two brake chambers of the third group are arranged on the rear axle.

4. The parking brake system according to claim 3, characterized in that: the relay valve is installed near the middle axle; a quick release valve is connected between the two brake chambers of the first group and between the two brake chambers of the third group, and the two quick release valves are connected to the relay valve to accelerate the air release speed of the brake chambers to the relay valve.

5. An engineering vehicle, characterized in that: it comprises the parking brake system according to any one of claims 1 to 4.

6. The engineering vehicle according to claim 5, characterized in that: the engineering vehicle comprises a mine dump truck.

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