Telescopic arm off-road forklift braking device

Abstract

The utility model discloses a telescopic arm cross-country forklift braking device which comprises a forklift rear drive axle, a forklift front drive axle and a braking electromagnetic valve, the braking electromagnetic valve is connected with a braking cylinder, the braking cylinder is connected with an oil supplementing electromagnetic valve, the oil supplementing electromagnetic valve is connected with an oil supplementing pot, the braking cylinder is connected with a braking valve block, and the braking valve block is connected with an oil supplementing pump. The brake valve block is connected with the forklift rear drive axle and the forklift front drive axle; according to the telescopic arm off-road forklift braking device, the problems that in the prior art, air cannot be completely exhausted, the braking effect is delayed, and unnecessary vehicle braking is generated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a braking device for a telescopic boom rough terrain forklift. Background Technique

[0002] A telescopic boom rough terrain forklift is an engineering vehicle that can safely and efficiently perform loading, unloading, stacking and handling operations on slopes and uneven ground. Like a counterbalance forklift, it can be equipped with forks or replaced with a variety of attachments to improve operation efficiency. Rough terrain forklifts are mainly used in urban construction sites, pipeline laying, oilfield development, mountain forest areas and other field projects, as well as the loading and unloading of containers at wharf cargo yards. They are also used in the military to load and unload military supplies during wartime.

[0003] To meet safety requirements, rough terrain forklifts are equipped with parking brakes and service brakes. Both of them lock the drive axle through the brake cylinder to ensure driving safety. When parking, the entire hydraulic system is powered off, and the brake, under the action of the spring, enables the brake cylinder to lock the drive axle. Service braking is achieved when driving, and the driver controls the brake oil circuit through the foot pedal. The service braking system is divided into two types: pure hydraulic and electro-hydraulic. The brake oil circuit is a one-way oil circuit, and it is difficult to remove air from the oil circuit. If there is air in the brake system oil circuit, it will cause two consequences: (1) When the driver steps on the brake pedal, because there is air in the pipeline, the hydraulic system will first compress the air and then the oil, which will delay the braking effect and pose a safety hazard. (2) If there is air in the brake oil circuit, during repeated braking by the driver, the oil temperature in the oil circuit will increase, which will cause the air in the pipeline to expand due to heat, resulting in unnecessary vehicle braking and poor driving comfort. Content of the Utility Model

[0004] The purpose of the utility model is to provide a braking device for a telescopic boom rough terrain forklift, which solves the problems that the prior art cannot completely exhaust air, delays the braking effect and generates unnecessary vehicle braking.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A braking device for a telescopic boom rough terrain forklift, comprising:

[0006] The rear drive axle and the front drive axle of the forklift;

[0007] A brake solenoid valve, the brake solenoid valve is connected to a brake cylinder, the brake cylinder is connected to a make-up oil solenoid valve, the make-up oil solenoid valve is connected to a make-up oil pot, the brake cylinder is connected to a brake valve block, and the brake valve block is connected to the rear drive axle and the front drive axle of the forklift.

[0008] Preferably, the brake solenoid valve is connected to a pilot valve group through a pipeline, the pilot valve group is connected to an accumulator through a pipeline, and the pilot valve group is connected to a shift valve through a pipeline.

[0009] Preferably, the pilot valve group is connected to the front drive axle of the forklift through a pipeline.

[0010] Preferably, the pilot valve group is connected to the pipeline connecting the oil replenishing solenoid valve and the brake cylinder through a pipeline, and a ball valve is arranged on the pipeline connecting the pilot valve group and the pipeline between the oil replenishing solenoid valve and the brake cylinder.

[0011] Preferably, the pilot valve group is connected to a shuttle valve through a pipeline, the shuttle valve is connected to a walking pump port through a pipeline, and the shuttle valve is connected to a multi-way valve port through a pipeline.

[0012] From the above technical solutions, it can be seen that the present utility model has the following beneficial effects:

[0013] For the telescopic boom rough terrain forklift braking device, when the oil replenishing solenoid valve is energized and conducted, the brake cylinder is communicated with the oil replenishing kettle through the oil replenishing solenoid valve. The oil in the oil replenishing kettle flows into the brake valve block through the brake cylinder, and the oil finally flows to the rear drive axle and the front drive axle through the brake valve block, and the air in the pipeline is reversely discharged into the oil replenishing kettle in the form of bubbles. It does not need to rely on other auxiliary exhaust devices, has simple operation and saves manpower. It can be used for all fully hydraulic vehicles with axle drive, and is especially suitable for manufacturers to exhaust the gas in the service brake pipeline when leaving the factory or replacing the braking system. It can take into account the exhaust during factory production and also the gas generated in the pipeline during driving. To exhaust the air mixed with hydraulic oil in the service brake pipeline, by connecting the oil replenishing kettle, the air can be discharged into the oil replenishing kettle in the form of bubbles, solving the problems that the prior art cannot completely exhaust the air, delaying the braking effect and generating unnecessary vehicle braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the schematic diagram of the hydraulic device of the braking system of the present invention;

[0015] Figure 2 is the schematic diagram of the structure of the rear drive axle of the present invention;

[0016] Figure 3 is the schematic diagram of the structure of the front drive axle of the present invention;

[0017] Figure 4 is the schematic diagram of the flow direction of the parking brake oil of the present invention;

[0018] Figure 5 is the schematic diagram of the flow direction of the service brake oil of the present invention.

[0019] In the figure: 1. Brake solenoid valve; 2. Brake cylinder; 3. Oil replenishing solenoid valve; 4. Oil replenishing pot; 5. Brake valve block; 6. Rear drive axle of forklift; 7. Front drive axle of forklift; 8. Pilot valve group; 9. Accumulator; 10. Shift valve; 11. Ball valve; 12. Shuttle valve; 13. Travel pump port; 14. Multi-way valve port; 15. Service brake oil port of rear drive axle of forklift; 16. Exhaust plug of rear drive axle of forklift; 17. Parking brake oil port of front drive axle of forklift; 18. Exhaust plug of front drive axle of forklift; 19. Service brake oil port of front drive axle of forklift. Detailed implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figures 1 - 5 shown, a telescopic boom rough terrain forklift braking device includes a brake solenoid valve 1, a brake cylinder 2, an oil replenishing solenoid valve 3, an oil replenishing pot 4, a brake valve block 5, a rear drive axle 6 of the forklift, and a front drive axle 7 of the forklift. The brake solenoid valve 1 and the brake cylinder 2 are connected by a pipeline. The brake cylinder 2 is connected with an oil replenishing solenoid valve 3 through a pipeline. The oil replenishing solenoid valve 3 is connected with an oil replenishing pot 4 through a pipeline. The brake cylinder 2 is connected with a brake valve block 5 through a pipeline. The brake valve block 5 is connected with the rear drive axle 6 and the front drive axle 7 of the forklift through a pipeline. The front drive axle 7 of the telescopic boom rough terrain forklift in this patent has both parking brake and service brake functions, and the two brakes share a set of brake devices; the rear drive axle 6 of the forklift only has a service brake function and does not require other auxiliary exhaust devices, with simple operation and labor saving. It can be used for all fully hydraulic bridge-driven vehicles, especially suitable for manufacturers to exhaust the gas in the service brake pipeline after leaving the factory or replacing the braking system, taking into account the factory exhaust and also the gas generated during driving in the pipeline. To exhaust the air mixed with hydraulic oil in the service brake pipeline, by connecting the oil replenishing pot 4, the air can be discharged into the oil replenishing pot 4 in the form of bubbles.

[0022] Specifically, the brake solenoid valve 1 is connected to a pilot valve group 8 through a pipeline. The pilot valve group 8 is connected to an accumulator 9 through a pipeline, the pilot valve group 8 is connected to a shift valve 10 through a pipeline, and the pilot valve group 8 is connected through a pipeline to the pipeline connecting the oil replenishing solenoid valve 3 and the brake cylinder 2. A ball valve 11 is provided on the pipeline of the pilot valve group 8 that is connected to the pipeline between the oil replenishing solenoid valve 3 and the brake cylinder 2. One end of the brake solenoid valve 1 is connected to the oil outlet of the pilot valve group 8, and the other end is connected to the brake cylinder 2. The initial state of the oil replenishing solenoid valve 3 is that the two ends are not electrically connected. Only when receiving a braking command will the solenoid valve be energized, and only then will the oil in the pilot valve group 8 flow into the brake cylinder 2. One end of the oil replenishing solenoid valve 3 is connected to an oil replenishing pot 4, and the other end is connected to the brake cylinder 2. The initial state of the oil replenishing solenoid valve 3 is that the two ends are not electrically connected. Only when the solenoid valve is energized will the oil replenishing pot 4 be in communication with the brake cylinder 2, and the oil in the oil replenishing pot 4 will enter the brake cylinder 2. The brake cylinder 2 has two oil inlets and one oil outlet. The oil inlets are respectively connected to the oil replenishing solenoid valve 3 and the brake solenoid valve 1, and the oil outlet is connected to a brake valve block 5.

[0023] Specifically, the pilot valve group 8 is connected to the front drive axle 7 of the forklift through a pipeline. The pilot valve group 8 is connected to a shuttle valve 12 through a pipeline, the shuttle valve 12 is connected to a walking pump port 13 through a pipeline, and the shuttle valve 12 is connected to a multi-way valve port 14 through a pipeline. The brake valve block 5 has a total of one oil inlet and two oil outlets. The oil inlet is connected to the outlet of the brake cylinder 2, and the two oil outlets are respectively connected to the brake oil inlets of the front axle drive 7 and the rear axle drive 6 of the forklift, so that the oil flows into the drive axle to achieve the purpose of braking. The pilot valve group 8 has one oil inlet and three oil outlets. The oil inlet is connected to the shuttle valve 12, and the oil outlets are connected to the ball valve 11 for subsequent exhaust operations and to the parking brake oil port 17 of the front drive axle of the forklift for parking brake and to the service brake solenoid valve 1 to provide oil for service braking. There are a parking brake oil port, a service brake oil port, and an exhaust plug on the front drive axle 7 of the forklift, and there are a service brake oil port and an exhaust plug on the rear drive axle 6 of the forklift.

[0024] The pilot valve group 8 does not participate in the work during normal service braking. Only during parking braking and when the braking system is exhausting air will the pilot valve group 8 be energized and conduct to participate in the work. The shuttle valve 12 has one oil outlet and two oil inlets. The oil outlet is connected to the oil inlet of the pilot valve group 8, and the oil inlets are connected to the multi-way valve port 14 and the walking pump port to provide the oil required for the entire braking system. To ensure the normal operation of the braking system, it is necessary to ensure that there is no air residue in the pipeline of the braking system. And when the pipeline of the braking system is disassembled and reinstalled, the first step is to exhaust the air from the braking system. For the convenience of operation, this system is designed with a hydraulic pipeline connection that uses the parking brake oil circuit to exhaust the air from the service brake pipeline.

[0025] To expel the air mixed with hydraulic oil in the service brake pipeline, after the vehicle is powered on, the oil replenishing solenoid valve 3 is energized, and c and d are conducted. Then, the brake cylinder 2 is connected to the oil replenishing pot 4 through the oil replenishing solenoid valve 3. The oil in the oil replenishing pot 4 flows into the brake valve block 5 through port B of the brake cylinder 2. Then, the oil finally flows to the rear drive axle 6 and the front drive axle 7 of the forklift through the brake valve block 5, and the air in the pipeline can be reversely discharged into the oil replenishing pot 4 in the form of bubbles.

[0026] The front drive axle has both parking brake and service brake functions. The two brakes share a set of brake mechanisms. When the vehicle starts, press the parking brake toggle "P", and the electromagnet of the pilot valve group 8 is energized, and e and f are conducted. At this time, the oil flows from port D of the pilot valve group 8 to the oil circuit of the front axle. Under the action of the pressure oil, the oil enters the parking brake oil port 17 of the front drive axle of the forklift, and the front axle parking spring is pushed open to release the parking brake. Similarly, when the parking brake toggle "P" is pressed again or the vehicle shuts down, the electromagnet of the pilot valve group 8 is de-energized. At this time, the oil circuit from the pilot valve group 8 to the front axle is cut off, and the front axle parking spring resumes its function to activate the parking brake.

[0027] Both the front drive axle 7 and the rear drive axle 6 of the forklift have service brake functions. When the electro-hydraulic proportional brake pedal is depressed, the oil replenishing solenoid valve 3 is immediately de-energized, cutting off the connection between the oil replenishing pot 4 and the brake cylinder 2. At the same time, the brake solenoid valve 1 is energized, and port a and port b of the brake solenoid valve 1 are communicated. At this time, the oil from port F of the pilot valve group 8 flows into port A of the brake cylinder 2 through port b of the brake solenoid valve 1, and after being pressurized by the brake cylinder 2, it flows into the brake valve block 5 through port C, and then is split to the service brake oil port 19 of the front drive axle of the forklift and the service brake oil port 15 of the rear drive axle of the forklift, and the service brake is engaged to achieve the service brake effect.

[0028] After the brake system is reinstalled, the air exhaust must be carried out after the engine is turned off. First, remove the cover under the driver's seat and the cover at the bottom of the cab, unplug the power supply connection wire of the oil replenishing solenoid valve 3, cut off the oil circuit connection between the oil replenishing pot 4 and the brake cylinder 2, open the ball valve 11 installed in the oil circuit, start the engine, press the parking brake toggle "P" in the cab. After the pilot valve group 8 is energized, c and d are conducted. The oil flows from port D of the pilot valve group 8 into the ball valve 11 and then into port B of the brake cylinder 2, and then flows into the front drive axle 7 and the rear drive axle 6 of the forklift through port C of the brake valve block 5. Open the exhaust plug 18 of the front drive axle of the forklift and observe the oil outlet state at the exhaust port. When the hydraulic oil ejected from the exhaust valve is no longer in a splashing state, tighten the exhaust plug. Open the exhaust plug 16 of the rear drive axle of the forklift and observe the oil outlet state at the exhaust port. When the hydraulic oil ejected from the exhaust valve is no longer in a splashing state, tighten the exhaust plug. Close the ball valve 11, turn off the engine, connect the power supply connection wire of the oil replenishing solenoid valve 3, and install the cover under the seat and the cover at the bottom of the cab.

[0029] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A telescopic arm off-road forklift braking device, characterized in that: include: A forklift rear drive axle (6) and a forklift front drive axle (7); A brake solenoid valve (1), wherein the brake solenoid valve (1) is connected to a brake cylinder (2), wherein the brake cylinder (2) is connected to an oil replenishing solenoid valve (3), wherein the oil replenishing solenoid valve (3) is connected to an oil replenishing pot (4), wherein the brake cylinder (2) is connected to a brake valve block (5), wherein the brake valve block (5) is connected to a forklift rear drive axle (6) and a forklift front drive axle (7).

2. A telescopic arm off-road forklift braking device according to claim 1, characterized in that: The brake solenoid valve (1) is connected to a pilot valve group (8) via a pipeline, the pilot valve group (8) is connected to an accumulator (9) via a pipeline, and the pilot valve group (8) is connected to a shift valve (10) via a pipeline.

3. The telescopic arm off-road forklift braking device according to claim 2, characterized in that: The pilot valve group (8) is connected to the front drive axle (7) of the forklift via a pipeline.

4. The telescopic arm off-road forklift braking device according to claim 2, characterized in that: The pilot valve group (8) is connected to a pipeline connecting the oil replenishing solenoid valve (3) and the brake cylinder (2) through a pipeline, and a ball valve (11) is provided on the pipeline on the pilot valve group (8) that is connected to the pipeline between the oil replenishing solenoid valve (3) and the brake cylinder (2).

5. The telescopic arm off-road forklift braking device according to claim 2, characterized in that: The pilot valve group (8) is connected to a shuttle valve (12) via a pipeline, the shuttle valve (12) is connected to a travel pump port (13) via a pipeline, and the shuttle valve (12) is connected to a multi-way valve port (14) via a pipeline.

Images