Wheel excavator with dozer blade motion deactivation brake control system and excavator

Abstract

The application discloses a wheel-digging bulldozing shovel movement release driving brake control system and a digging machine, which comprises a driving brake system, a bulldozing shovel movement system and a controller. The driving brake system comprises a brake valve and a pressure relief valve; the bulldozing shovel movement system comprises a bulldozing shovel handle and a bulldozing shovel oil cylinder; the brake valve, the bulldozing shovel handle, the bulldozing shovel oil cylinder and the pressure relief valve are electrically connected with the controller; the controller sequentially acquires brake valve oil pressure, bulldozing shovel handle pressure and bulldozing shovel oil cylinder oil pressure, and controls opening or closing of the pressure relief valve according to the oil pressure data, so as to release or re-establish the driving brake. The controller is arranged, and the controller judges the current bulldozing shovel state according to the collected oil pressure data, so as to decide whether to open the pressure relief valve, to release the driving brake, and to reduce the friction between the bulldozing shovel and the tire and the ground, so as to effectively protect the bulldozing shovel and the tire.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking system technology, and in particular to a control system for releasing the vehicle braking of a wheeled excavator by moving the bulldozer blade and an excavator. Background Technology

[0002] In existing technology, most wheeled hydraulic excavators (hereinafter referred to as wheeled excavators) are equipped with a bulldozer blade as standard. Due to the high mobility of wheeled excavators, the first step when a wheeled excavator travels to the work area is usually to depress the brake pedal to stop the entire machine. At this time, the service brake is activated. During operation, in order to increase the stability of the operation, it is necessary to raise the bulldozer blade so that it contacts the ground until it is lowered to its lowest position. Only then does the digging operation begin.

[0003] Under normal conditions, when the wheeled excavator travels to the work area, pressing the brake pedal activates the service brake and axle brakes, preventing the tires from rotating. When the work area has a certain slope, it is even more necessary to press the brake pedal to keep the machine in a stable and stopped state. When digging, the machine's digging stability is poor because it relies solely on the tires for contact with the ground. In this case, the bulldozer blade needs to be pushed to the ground. During the process of the bulldozer blade contacting the ground and pushing the entire vehicle up, the bulldozer blade will be subjected to a large frictional force from the ground, and the tires will also experience some sliding friction with the ground.

[0004] When the driving brake of the wheeled excavator is activated, as the bulldozer blade moves to the ground and is in the process of being supported, the bulldozer blade slides forward relative to the direction of travel of the wheeled excavator, which will generate a large friction force with the ground. This force is an important factor that causes the bulldozer blade to crack. At the same time, during this process, the tires on the side away from the bulldozer blade will slide backward, which will accelerate tire wear. Summary of the Invention

[0005] In view of this, the present invention provides a control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator, which can reduce the friction between the bulldozer blade and the ground, as well as the friction between the tires and the ground, and can effectively protect the bulldozer blade and the tires.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator includes: a driving brake system, a bulldozer blade motion system, and a controller.

[0007] The vehicle braking system includes a brake valve and a pressure relief valve; the bulldozer blade motion system includes a bulldozer blade handle and a bulldozer blade cylinder; the brake valve, bulldozer blade handle, bulldozer blade cylinder, and pressure relief valve are all electrically connected to the controller. The controller sequentially acquires the hydraulic pressure of the brake valve, the pressure of the bulldozer blade handle, and the hydraulic pressure of the bulldozer blade cylinder, and controls the opening or closing of the pressure relief valve based on the above hydraulic pressure data to release or re-establish the vehicle braking.

[0008] Preferably, the bulldozer blade motion system further includes: an overflow valve; when the hydraulic pressure of the brake valve is greater than the service brake pressure, the hydraulic pressure of the bulldozer blade handle is greater than 0, and the hydraulic pressure of the bulldozer blade cylinder is greater than the preset pressure of the overflow valve, the controller controls the pressure relief valve to open to release the service brake; when any hydraulic pressure condition is not met, the controller does not operate or controls the pressure relief valve to close to re-establish the service brake.

[0009] Preferably, the vehicle braking system further includes: a brake pedal, a brake pump, and a brake; the brake pedal is connected to the brake valve; the brake pump is connected to the brake via the brake valve; when the brake pedal is depressed, the brake valve opens and the brake pump is connected to the brake; conversely, when the brake pedal is depressed, the brake valve closes and the brake pump is disconnected from the brake.

[0010] Preferably, the bulldozer blade motion system further includes: a main pump and a main valve; the bulldozer blade handle is connected to the main valve in a transmission manner, and the main pump is connected to the bulldozer blade cylinder through the main valve; when the bulldozer blade handle is pushed, the main valve opens, and the main pump is connected to the bulldozer blade cylinder; conversely, when the handle is pushed, the main valve closes, and the main pump is disconnected from the bulldozer blade cylinder.

[0011] A wheel-mounted hydraulic excavator includes a wheel-mounted excavator with a bulldozer blade motion release travel brake control system, a frame, a bulldozer blade, and a bulldozer blade cylinder; both the bulldozer blade and the bulldozer blade cylinder are hinged to the rear end of the frame, the bulldozer blade cylinder is drivenly connected to the bulldozer blade, and the bulldozer blade cylinder is used to drive the bulldozer blade to rotate, so that the bulldozer blade is raised or lowered.

[0012] Preferably, the tire-mounted hydraulic excavator further includes an axle; the axle is rigidly connected to the frame.

[0013] Preferably, the tire-mounted hydraulic excavator further includes tires; the tires are rigidly connected to the axle.

[0014] Preferably, the wheeled hydraulic excavator further includes a cab, which is mounted on the chassis.

[0015] Preferably, the wheeled hydraulic excavator further includes a bucket assembly located at the front of the cab.

[0016] Compared with the prior art, the present application discloses a control system for releasing the driving brake of a bulldozer blade for a wheeled excavator. By setting up a controller, the controller determines the current state of the bulldozer blade based on the collected hydraulic pressure data, and then decides whether to open the pressure relief valve to release the driving brake, thereby reducing the friction between the bulldozer blade and tires and the ground, so as to effectively protect the bulldozer blade and tires.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator, as disclosed in the embodiments of this application. Figure 2 This is a logic diagram of the control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator, as disclosed in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the tire-mounted hydraulic excavator disclosed in the embodiments of this application.

[0019] Figure label: 1. Chassis; 2. Bulldozer blade; 3. Bulldozer blade hydraulic cylinder; 4. Axle; 5. Tires; 6. Cab; 7. Bucket assembly; P1, service brake pressure; P2, relief valve pressure. Detailed Implementation

[0020] This invention discloses a control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator. This system can reduce the friction between the bulldozer blade 2 and the ground, as well as the friction between the tire 5 and the ground, and can effectively protect the bulldozer blade 2 and the tire 5.

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] The following is for reference. Figures 1 to 3 This invention describes a bulldozer blade movement release control system for wheeled excavators in an embodiment of the invention.

[0024] This application discloses a control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator, comprising: a driving brake system, a bulldozer blade movement system, and a controller.

[0025] The vehicle braking system includes a brake valve and a pressure relief valve; the bulldozer blade motion system includes a bulldozer blade handle and a bulldozer blade cylinder; the brake valve, bulldozer blade handle, bulldozer blade cylinder, and pressure relief valve are all electrically connected to the controller. The controller sequentially acquires the hydraulic pressure of the brake valve, the pressure of the bulldozer blade handle, and the hydraulic pressure of the bulldozer blade cylinder, and controls the opening or closing of the pressure relief valve based on the above hydraulic pressure data to release or re-establish the vehicle braking.

[0026] Based on the collected hydraulic pressure data, the controller can determine the current status of the bulldozer blade 2 and decide whether to open the pressure relief valve to release the driving brake, thereby reducing the friction between the bulldozer blade 2 and the tire 5 and the ground, so as to effectively protect the bulldozer blade 2 and the tire 5.

[0027] Furthermore, the bulldozer blade motion system also includes: an overflow valve; when the brake valve hydraulic pressure is greater than the service brake pressure P1, the bulldozer blade handle hydraulic pressure is greater than 0, and the bulldozer blade cylinder hydraulic pressure is greater than the preset pressure of the overflow valve, the controller controls the pressure relief valve to open to release the service brake; when any hydraulic pressure condition is not met, the controller does not operate or controls the pressure relief valve to close so that the service brake can be re-established.

[0028] When the wheeled excavator is traveling normally, the bulldozer blade 2 is in the raised state. When the wheeled excavator travels to the construction site, the brake pedal is pressed, the brake valve opens, the service brake is activated, the tire 5 cannot rotate, and the brake valve oil pressure is collected at the same time.

[0029] At this point, pushing the bulldozer blade handle activates the bulldozer blade cylinder, causing the bulldozer blade 2 to begin descending. The hydraulic pressure of the bulldozer blade handle is collected by the controller. When the bulldozer blade 2 reaches the ground, due to the continued movement of the bulldozer blade cylinder, the bulldozer blade 2 slides forward in the machine's forward direction, while the tire 5 slides backward. The bulldozer blade 2 experiences friction from the ground, increasing the pressure in the bulldozer blade cylinder. This hydraulic pressure exceeds the set overflow valve pressure P2, which is collected by the controller. At this point, the conditions for opening the pressure relief valve are met. After the pressure relief valve opens, the braking pressure is lost, and the service brake is released. At this time, the tire 5 can rotate. When the bulldozer blade 2 continues to descend to its limit, since the tire 5 can rotate, the friction force is rolling friction and the force is very small. The bulldozer blade 2 no longer experiences sliding friction with the ground, and the friction between the tire 5 and the ground, as well as between the bulldozer blade 2 and the ground, is significantly reduced.

[0030] When the bulldozer blade 2 falls to its limit, the bulldozer blade handle is released. At this time, the hydraulic pressure of the bulldozer blade 2 is 0, which does not meet the pressure relief valve's pressure relief condition. The pressure relief valve closes, the brake fluid pressure is re-established, the service brake takes effect, and the tire 5 cannot rotate.

[0031] Conversely, if the bulldozer blade 2 is lifted after the entire vehicle has finished working, the brake pedal is pressed, the brake valve opens, the service brake is activated, the tire 5 cannot rotate, and the brake valve oil pressure is collected at the same time. At this point, pushing the bulldozer blade handle activates the bulldozer blade cylinder, causing the bulldozer blade 2 to lift. The hydraulic pressure of the bulldozer blade handle is collected by the controller. Since the bulldozer blade 2 is in contact with the ground, it slides backward in the machine's forward direction, while the tires 5 slide forward. The bulldozer blade 2 experiences friction from the ground and bears the weight of the entire vehicle, increasing the pressure in the bulldozer blade cylinder. This pressure exceeds the set overflow valve pressure P2, which is collected by the controller. This satisfies the condition for opening the pressure relief valve. Once the pressure relief valve opens, the braking pressure is lost, and the service brake is released. The tires 5 can then rotate. When the bulldozer blade 2 continues to lift off the ground, it no longer bears the weight of the entire machine. At this point, the bulldozer blade cylinder pressure drops below the set overflow valve pressure P2, no longer meeting the condition for opening the pressure relief valve. The pressure relief valve closes, the brake fluid pressure is re-established, the service brake takes effect, and the tires 5 cannot rotate.

[0032] In some embodiments, the service braking system further includes: a brake pedal, a brake pump, and a brake; the brake pedal is drivenly connected to a brake valve; the brake pump is connected to the brake via the brake valve; when the brake pedal is depressed, the brake valve opens, the brake pump is connected to the brake, and the service braking is effective; conversely, when the brake pedal is depressed, the brake valve closes, the brake pump is disconnected from the brake, and the service braking fails.

[0033] In some embodiments, the bulldozer blade motion system further includes: a main pump and a main valve; the bulldozer blade handle is drivenly connected to the main valve, and the main pump is connected to the bulldozer blade cylinder through the main valve; when the bulldozer blade handle is pushed, the main valve opens, the main pump is connected to the bulldozer blade cylinder, and the bulldozer blade cylinder moves; conversely, when the handle is pushed, the main valve closes, the main pump is disconnected from the bulldozer blade cylinder, and the bulldozer blade cylinder does not move.

[0034] In addition, this application also discloses a tire-type hydraulic excavator, including the wheel excavator bulldozer blade movement release vehicle brake control system disclosed in the above embodiments, frame 1, bulldozer blade 2 and bulldozer blade cylinder; both bulldozer blade 2 and bulldozer blade cylinder are hinged to the rear end of frame 1, the bulldozer blade cylinder is connected to the bulldozer blade 2 in a transmission, and the bulldozer blade cylinder is used to push the bulldozer blade 2 to rotate so that the bulldozer blade 2 is raised or lowered.

[0035] Furthermore, the tire-mounted hydraulic excavator also includes an axle 4, a tire 5, a cab 6, and a bucket assembly 7; the axle 4 is rigidly connected to the frame 1; the tire 5 is rigidly connected to the axle 4; the cab 6 is mounted on the frame 1; and the bucket assembly 7 is located in front of the cab 6.

[0036] The control system for releasing the travel brake of the wheeled excavator and other components and operations of the wheeled excavator hydraulic excavator according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator, characterized in that, include: Service braking system, bulldozer blade motion system and controller; The vehicle braking system includes: a brake valve and a pressure relief valve; The bulldozer blade motion system includes: a bulldozer blade handle, a bulldozer blade cylinder, and an overflow valve; The brake valve, the bulldozer handle, the bulldozer cylinder, and the pressure relief valve are all electrically connected to the controller. The controller sequentially acquires the hydraulic pressure of the brake valve, the pressure of the bulldozer handle, and the hydraulic pressure of the bulldozer cylinder, and controls the opening or closing of the pressure relief valve based on the above hydraulic pressure data to release or re-establish the service brake. When the hydraulic pressure of the brake valve is greater than the service brake pressure, the hydraulic pressure of the bulldozer blade handle is greater than 0, and the hydraulic pressure of the bulldozer blade cylinder is greater than the preset pressure of the overflow valve, the controller controls the pressure relief valve to open to release the service brake. When any hydraulic pressure condition is not met, the controller either does not operate or controls the pressure relief valve to close, so that the service brake can be re-established.

2. The control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator according to claim 1, characterized in that, The vehicle braking system further includes: a brake pedal, a brake pump, and a brake; the brake pedal is drively connected to the brake valve; the brake pump is connected to the brake via the brake valve; When the brake pedal is pressed, the brake valve opens, and the brake pump connects to the brake; conversely, when the brake pedal is depressed, the brake valve closes, and the brake pump disconnects from the brake.

3. The control system for releasing the driving brake of a bulldozer blade used in a wheeled excavator according to claim 1, characterized in that, The bulldozer blade motion system also includes: a main pump and a main valve; the bulldozer blade handle is connected to the main valve in a transmission connection, and the main pump is connected to the bulldozer blade cylinder through the main valve; When the bulldozer blade handle is pushed, the main valve opens, and the main pump is connected to the bulldozer blade cylinder; conversely, when the handle is pushed, the main valve closes, and the main pump is disconnected from the bulldozer blade cylinder.

4. A tire-mounted hydraulic excavator, characterized in that, Includes the bulldozer blade movement release vehicle brake control system, frame, bulldozer blade, and bulldozer blade cylinder of any one of claims 1-3 above; Both the bulldozer blade and the bulldozer blade cylinder are hinged to the rear end of the vehicle frame. The bulldozer blade cylinder is connected to the bulldozer blade in a transmission manner. The bulldozer blade cylinder is used to drive the bulldozer blade to rotate, so that the bulldozer blade can be raised or lowered.

5. The tire-mounted hydraulic excavator according to claim 4, characterized in that, It also includes an axle; the axle is rigidly connected to the frame.

6. The tire-mounted hydraulic excavator according to claim 5, characterized in that, It also includes tires; the tires are rigidly connected to the axle.

7. The tire-mounted hydraulic excavator according to claim 4, characterized in that, It also includes a cockpit, which is mounted on the chassis.

8. The tire-mounted hydraulic excavator according to claim 7, characterized in that, It also includes a bucket assembly located at the front of the cab.

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