A control device for a dump truck bed that cannot travel in a raised state

Abstract

The utility model relates to short -distance self -discharging transportation technical field, proposes a kind of control device of self -discharging car carriage in lifting state cannot walk, including air cylinder, the air cylinder gas outlet end is connected with one three-way through air pipe, another two interfaces of the one three-way are connected with electromagnetic control constant break one-way valve and travelling brake respectively through air pipe, the gas outlet end of the electromagnetic control constant break one-way valve and travelling brake is connected with two three-way, the third interface of the two three-way is fixedly connected with the follow-up valve, two gas outlet ends of the follow-up valve are connected with rear brake master cylinder and rear air cylinder respectively.The above technical scheme, solve the existing technology in the working environment (noise, lighting, dust, high temperature, etc.) of self -discharging car (noise, lighting, dust, high temperature, etc.) quite complex and bad, and driver fatigue driving etc.

Description

Technical Field

[0001] This utility model relates to the field of short-distance self-unloading transportation technology, and in particular to a control device for a self-unloading truck that cannot move when its cargo box is in a raised state. Background Technology

[0002] Dump trucks are vehicles that unload goods themselves using hydraulic lifting. They are also known as tipper trucks. Dump truck bodies come in two types: rear-tipping and side-tipping, with rear-tipping being more common. Because the dump truck body can automatically tilt at a certain angle to unload, it greatly saves unloading time and labor, shortens the transportation cycle, improves production efficiency, and reduces transportation costs. It is a commonly used specialized vehicle for transporting earth, sand, gravel, and bulk materials.

[0003] When the cargo box of a rear-tipping dump truck is raised, its front end can reach a height of over 8 meters above the ground. However, during dump truck transportation, it frequently happens that the cargo box rises on its own due to factors such as the driver forgetting to lower the box and continuing to drive, or non-standard driver operation. These un-lowered cargo boxes can cause damage to overhead power lines, cables, overhead pipelines, corridors, and other public facilities along the road. The consequences can range from minor issues like water and power outages and gas / steam leaks to major accidents such as factory shutdowns and casualties. Currently, some vehicles are manufactured or installed with dump truck cargo box lifting alarm control devices by the manufacturers themselves. However, due to the complex and harsh working environment of dump trucks (noise, lighting, dust, high temperatures, etc.) and driver fatigue, these alarm control devices cannot effectively prevent this phenomenon from occurring.

[0004] Therefore, it is essential to design and manufacture a control device that prevents dump trucks from moving when their cargo boxes are in a raised state, especially for applications in complex and special work sites where there are cables, pipes, corridors, and other obstacles above the factory roads. Utility Model Content

[0005] The technical problem to be solved by this utility model is a control device that prevents the dump truck body from moving when it is in the raised state. It utilizes the dump truck's service brake (foot brake) system to automatically interlock with the body lifting system, thereby realizing automatic control of the dump truck body from moving when it is in the raised state.

[0006] The technical solution of this utility model is as follows: A control device for a dump truck body that cannot move when it is in a raised state includes an air tank. The air outlet of the air tank is connected to a No. 1 tee via an air pipe. The other two ports of the No. 1 tee are respectively connected to an electromagnetically controlled normally closed one-way valve and a service brake via air pipes. The air outlets of the electromagnetically controlled normally closed one-way valve and the service brake are connected to a No. 2 tee. The third port of the No. 2 tee is fixedly connected to a follower valve. The two air outlets of the follower valve are respectively connected to a rear brake cylinder and a rear air tank.

[0007] One terminal of the electromagnetically controlled normally closed check valve coil is connected to a ground point. The other terminal of the electromagnetically controlled normally closed check valve coil is connected to an automatic reset normally closed switch. The other terminal of the automatic reset normally closed switch is connected to a second normally closed limit switch. The other terminal of the second normally closed limit switch is connected to a first normally closed limit switch. The other end of the first normally closed limit switch is connected to a battery. The battery, the first normally closed limit switch, the second normally closed limit switch, the automatic reset normally closed switch, the electromagnetically controlled normally closed check valve, and the ground point are connected in series.

[0008] The voltage of the normally closed electromagnetic control check valve coil is 24 volts.

[0009] The beneficial effects of this utility model are as follows: 1. The carriage is not lowered and is in a raised position, making it impossible to start moving. 2. When the unloading compartment is in the lifting position and the vehicle needs to be moved forward, it can be moved forward and the self-unloading task can be completed normally; 3. The No. 1 normally closed limit switch and the No. 2 normally closed limit switch are connected in series to ensure effective control and prevent sudden braking and inability to move when the carriage shakes. 4. The system's air circuit and circuit structure are the most basic and simplest, making them easy to design and install; 5. The system is intuitive, simple, safe and reliable to operate, with low assembly costs and convenient maintenance. Attached Figure Description

[0010] Figure 1 This is a diagram of the overall pneumatic control system of this utility model; Figure 2 This is the control circuit diagram of the electromagnetically controlled normally closed check valve of this utility model.

[0011] In the diagram: 1. Air reservoir; 2. No. 1 tee; 3. No. 2 tee; 4. Rear relay valve; 5. Rear air reservoir; 6. Grounding point; 7. Battery; K1. No. 1 normally closed limit switch; K2. No. 2 normally closed limit switch; K3. Automatic reset normally closed switch; F. Electromagnetically controlled normally closed check valve; Q. Service brake; B. Rear brake caliper. Detailed Implementation

[0012] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0013] Please see Figure 1 This utility model proposes a control device for a dump truck body that cannot move when it is in a raised state. It includes an air tank 1. The air outlet of the air tank 1 is connected to a No. 1 tee 2 via an air pipe. The other two ports of the No. 1 tee 2 are respectively connected to an electromagnetically controlled normally closed one-way valve F and a service brake Q via air pipes. The electromagnetically controlled normally closed one-way valve F is installed near the service brake Q in the cab. The air outlets of the electromagnetically controlled normally closed one-way valve F and the service brake Q are connected to a No. 2 tee 3. The third port of the No. 2 tee 3 is fixedly connected to a follower valve 4. The two air outlets of the follower valve 4 are respectively connected to a rear brake caliper B and a rear air tank 5.

[0014] Please see Figure 2 One terminal of the electromagnetically controlled normally closed check valve F coil is connected to ground point 6. The other terminal of the electromagnetically controlled normally closed check valve F coil is connected to an automatic reset normally closed switch K3. The other terminal of the automatic reset normally closed switch K3 is connected to a second normally closed limit switch K2. The other terminal of the second normally closed limit switch K2 is connected to a first normally closed limit switch K1. The other end of the first normally closed limit switch K1 is connected to a battery 7. The battery 7 and the first normally closed limit switch K1... The No. 2 normally closed limit switch K2, the automatic reset normally closed switch K3, the electromagnetically controlled normally closed check valve F, and the ground point 6 are connected in series. The No. 1 normally closed limit switch K1 is installed on the front of the same side of the subframe, 1 meter from the end. The No. 2 normally closed limit switch K2 is installed on the rear of the subframe, 1 meter from the axle of the carriage. The No. 1 normally closed limit switch K1 and the No. 2 normally closed limit switch K2 are in the open state when the carriage is lowered and in the closed state when the carriage is raised. The automatic reset normally closed switch K3 is installed in a position that is convenient for the driver to control in the cab.

[0015] The voltage of the coil of the electromagnetically controlled normally closed check valve F is 24 volts.

[0016] When using this embodiment: 1. Regardless of whether the dump truck driver forgets to lower the truck bed or the driver's non-standard operation causes the truck bed to rise on its own while the truck bed is raised and the vehicle is moving, the No. 1 normally closed limit switch K1 and the No. 2 normally closed limit switch K2 will close simultaneously due to the lack of pressure from the truck bed, automatically connecting the coil of the electromagnetically controlled normally closed air circuit one-way valve F. The circuit causes the electromagnetically controlled normally closed air circuit one-way valve F to operate and be in the closed state. At this time, the air tank 1 charges the air circuit of the service brake Q and the subsequent valve 4 through the electromagnetically controlled normally closed air circuit one-way valve F, generating the service brake. The vehicle cannot move or the engine will stall, thus realizing the function of the truck bed being in a raised state and unable to move. 2. If the unloading car is in the lifting position and needs to move forward intermittently to unload, the driver presses the automatic reset normally closed switch K3 to forcibly disconnect the control circuit, de-energize the electromagnetic control normally closed air circuit one-way valve F, close the air circuit of the electromagnetic control normally closed air circuit one-way valve F, and exhaust the rear brake caliper B in the service braking system through the rear relay valve 4 to release the service braking state, so as to realize the forward movement of the car when it is lifted.

[0017] 3. When the carriage is lowered to the rear, the No. 1 normally closed limit switch K1 and the No. 2 normally closed limit switch K2 are de-energized, the coil F of the electromagnetically controlled normally closed air circuit check valve is de-energized, the air circuit of the electromagnetically controlled normally closed air circuit check valve F is closed, there is no braking gas in the air circuit of the rear brake cylinder B, there is no braking, and the vehicle can start and move normally.

[0018] In addition, when using this embodiment, the following should also be noted: 1. Drivers must not rely on this system for non-standard operations. After unloading, they must confirm that the cargo box is properly positioned and disconnect the power take-off before proceeding. 2. The driving brake system of the dump truck must be in good working order and effective; 3. Conduit should be used for wiring, and all circuit connections should be reliable to prevent sudden braking caused by wire damage and grounding. 4. When the carriage is lifted and the vehicle needs to be moved, hold the steering wheel firmly with one hand before pressing the automatic reset normally closed switch K3 with the other hand. 5. A buzzer alarm device or alarm light can be connected in parallel in the control circuit to indicate that the carriage is in the lifting state.

[0019] 6. When using this system, the vehicle speed should be controlled below 20km / h.

Claims

1. A control device for a dump truck that cannot move when its cargo box is in a raised state, characterized in that, Includes an air reservoir (1), the air outlet of the air reservoir (1) is connected to a No. 1 tee (2) via an air pipe, the other two ports of the No. 1 tee (2) are respectively connected to an electromagnetically controlled normally closed one-way valve (F) and a service brake (Q) via air pipes, the air outlets of the electromagnetically controlled normally closed one-way valve (F) and the service brake (Q) are connected to a No. 2 tee (3), the third port of the No. 2 tee (3) is fixedly connected to a rear actuator valve (4), the two air outlets of the rear actuator valve (4) are respectively connected to a rear brake caliper (B) and a rear air reservoir (5).

2. The control device for a dump truck body that cannot move when in a raised state, as described in claim 1, is characterized in that... One terminal of the electromagnetically controlled normally closed check valve (F) coil is connected to a ground point (6). The other terminal of the electromagnetically controlled normally closed check valve (F) coil is connected to an automatic reset normally closed switch (K3). The other terminal of the automatic reset normally closed switch (K3) is connected to a second normally closed limit switch (K2). The other terminal of the second normally closed limit switch (K2) is connected to a first normally closed limit switch (K1). The other end of the first normally closed limit switch (K1) is connected to a battery (7). The battery (7), the first normally closed limit switch (K1), the second normally closed limit switch (K2), the automatic reset normally closed switch (K3), the electromagnetically controlled normally closed check valve (F), and the ground point (6) are connected in series.

3. The control device for a dump truck body that cannot move when in a raised state, as described in claim 1, is characterized in that... The voltage of the electromagnetically controlled normally closed check valve (F) is 24 volts.

Images