Constant-speed cruise control device and method for excavator

Abstract

According to the excavator constant-speed cruise control device and method, a user presses a rocker switch to the position corresponding to the cruise direction, the rocker switch gives an electric signal corresponding to the cruise direction to a controller, the user turns on the cruise switch in the controller, the controller gives an electric signal corresponding to the opening of an oil outlet of a proportional electromagnetic valve, and the proportional electromagnetic valve is switched on. The proportional electromagnetic valve receives electric signals and outputs hydraulic oil, the hydraulic oil enters the shuttle valve and is injected into a pilot control oil way in the corresponding direction, constant-speed cruising is achieved, the cruising speed can be steplessly adjusted between zero and the maximum walking speed, walking is stable, the working intensity of a driver is reduced, and the service life of the driver is prolonged. The manual walking system and the cruise system are independent of each other and do not affect each other, safety and stability are improved, normal manual operation of walking of the excavator is not affected, installation of an existing excavator is facilitated, damage is small, and good practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and in particular to an excavator cruise control device and method. Background Art

[0002] An excavator is an earth-moving machine that uses a bucket to dig materials above or below the bearing surface and loads them into transport vehicles or unloads them to stockpiles. The materials excavated by the excavator are mainly soil, coal, silt, and pre-loosened soil and rocks. From the development of engineering machinery in recent years, the development of excavators is relatively rapid. Excavators have become one of the most important engineering machinery in engineering construction. Under some working conditions, the excavator is required to move at a certain speed. Due to slight shaking during manual operation, it is difficult to ensure a constant speed. At the same time, other operations are generally added during movement. The driver works for a long time and the operation intensity is relatively high. In addition, traditional conventional excavators do not have the function of cruise control. Therefore, the inventor aims to design a device and method with a simple structure that can be easily installed on traditional excavators to realize the cruise function. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an excavator cruise control device and method in view of the deficiencies in the prior art, so as to solve at least one of the above technical problems.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: an excavator cruise control device and method, including a travel pilot valve, a controller, a proportional solenoid valve, and a main valve, the left front travel oil outlet of the travel pilot valve is connected to the left travel valve core of the main valve through the left front travel oil pipe, the left rear travel oil outlet of the travel pilot valve is connected to the left travel valve core of the main valve through the left rear travel oil pipe, the right front travel oil outlet of the travel pilot valve is connected to the right travel valve core of the main valve through the right front travel oil pipe, and the right rear travel oil outlet of the travel pilot valve is connected to the right travel valve core of the main valve through the right rear travel oil pipe. The controller is electrically connected to a rocker switch, and the controller is electrically connected to a proportional solenoid valve. The oil inlet of the proportional solenoid valve is connected to the oil pump of the excavator, the first oil outlet of the proportional solenoid valve is connected to the left rear travel oil pipe and the right rear travel oil pipe through a shuttle valve, and the second oil outlet of the proportional solenoid valve is connected to the left front travel oil pipe and the right front travel oil pipe through a shuttle valve.

[0005] Furthermore, the left rear traveling oil outlet and the first oil outlet are both connected to the oil inlet of the corresponding shuttle valve, and the oil outlet of the shuttle valve is connected to the left traveling valve core, the right rear traveling oil outlet and the first oil outlet are both connected to the oil inlet of the corresponding shuttle valve, and the oil outlet of the shuttle valve is connected to the right traveling valve core, the left front traveling oil pipe and the second oil outlet are both connected to the oil inlet of the corresponding shuttle valve, and the oil outlet of the shuttle valve is connected to the left traveling valve core, the right front traveling oil pipe and the second oil outlet are both connected to the oil inlet of the corresponding shuttle valve, and the oil outlet of the shuttle valve is connected to the right traveling valve core.

[0006] Furthermore, the rocker switch is a three-position self-locking type, the middle position of the rocker switch is a manual walking mode, the upper position of the rocker switch is a forward cruising mode, and the lower position of the rocker switch is a reverse walking mode.

[0007] Furthermore, the controller is electrically connected to an emergency stop button.

[0008] Furthermore, the controller is an excavator monitor.

[0009] Furthermore, the cruise holding method includes: the user presses the rocker switch to a position corresponding to the cruise direction, the rocker switch gives the controller an electrical signal corresponding to the cruise direction, the user turns on the setting of the cruise switch in the controller, the controller gives the proportional solenoid valve an electrical signal corresponding to the oil outlet opening, the proportional solenoid valve receives the electrical signal and outputs hydraulic oil, the hydraulic oil enters the shuttle valve and injects the hydraulic oil into the pilot control oil circuit of the corresponding direction, the pilot control oil circuit pushes the main valve spool corresponding to the travel, the main valve opens, and drives the excavator to travel at a constant speed; The cruise speed adjustment methods include: The user changes the speed setting of the controller to the corresponding speed, and the controller outputs an electrical signal to the proportional solenoid valve. The proportional solenoid valve receives the electrical signal and controls the opening of the corresponding valve port to adjust the pressure of the pilot control oil. The pilot control oil circuit pressure changes to change the opening of the corresponding main valve spool, and the excavator's constant speed travel speed changes to the corresponding speed.

[0010] Furthermore, the emergency stop method of the cruise control includes: The user presses the emergency stop button, which transmits an electrical signal to the controller. The controller receives the emergency stop signal and sends an emergency stop signal to the proportional solenoid valve. The proportional solenoid valve releases pressure, the main valve core corresponding to the travel is reset, and the excavator stops cruising.

[0011] The beneficial effects of the present invention are: The present invention adopts proportional solenoid valve control, and the monitor is built with a travel control program to achieve constant speed cruising, and the cruising speed can be adjusted steplessly between zero and the maximum travel speed, the travel is stable, and the driver's work intensity is reduced. The present invention is connected with the conventional excavator travel control pipeline through a shuttle valve, and the manual travel and cruise systems are independent of each other and do not affect each other, thereby improving safety and stability, not affecting the normal manual operation of the excavator travel, and facilitating installation on existing excavators, with less damage and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the present invention.

[0013] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Controller 1; rocker switch 2; emergency stop button 3; proportional solenoid valve 4; shuttle valve 5; travel pilot valve 6; main valve 7. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with specific embodiments, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0015] Example 1: See Figure 1 It is a schematic diagram of each structure of the present invention, including a travel pilot valve 6, a controller 1, a proportional solenoid valve 4, and a main valve 7. The left front travel oil outlet of the travel pilot valve 6 is connected to the left travel valve core of the main valve 7 through the left front travel oil pipe, the left rear travel oil outlet of the travel pilot valve 6 is connected to the left travel valve core of the main valve 7 through the left rear travel oil pipe, the right front travel oil outlet of the travel pilot valve 6 is connected to the right travel valve core of the main valve 7 through the right front travel oil pipe, and the right rear travel oil outlet of the travel pilot valve 6 is connected to the right travel valve core of the main valve 7 through the right rear travel oil pipe. The controller 1 is electrically connected to a rocker switch 2, through which the direction of cruising is controlled. The controller 1 is electrically connected to a proportional solenoid valve 4, the oil inlet of the proportional solenoid valve 4 is connected to the oil pump of the excavator, the first oil outlet of the proportional solenoid valve 4 is connected to the left rear travel oil pipe and the right rear travel oil pipe through a shuttle valve 5, when the first oil outlet outputs pressure, the excavator cruises backward at a constant speed, the second oil outlet of the proportional solenoid valve 4 is connected to the left front travel oil pipe and the right front travel oil pipe through the shuttle valve 5, when the second oil outlet outputs pressure, the excavator cruises forward at a constant speed.

[0016] Specifically, the left rear travel oil outlet and the first oil outlet are both connected to the oil inlet of the corresponding shuttle valve 5, and the oil outlet of the shuttle valve 5 is connected to the left travel valve core, the right rear travel oil outlet and the first oil outlet are both connected to the oil inlet of the corresponding shuttle valve 5, and the oil outlet of the shuttle valve 5 is connected to the right travel valve core. When the first oil outlet outputs pressure, the left rear travel oil outlet and the right rear travel oil outlet are both disconnected from the travel valve core. When the left rear travel oil outlet and the right rear travel oil outlet output pressure, the first oil outlet is disconnected from the travel valve core, and the left front travel oil pipe and the second The oil outlets are all connected with the oil inlets of the corresponding shuttle valves 5, and the oil outlets of the shuttle valves 5 are connected with the left traveling valve core; the right front traveling oil pipe and the second oil outlet are all connected with the oil inlets of the corresponding shuttle valves 5, and the oil outlets of the shuttle valves 5 are connected with the right traveling valve core; when the second oil outlet inputs pressure, the left front traveling oil pipe and the right front traveling oil pipe are both cut off from the traveling valve core; when the left front traveling oil pipe and the right front traveling oil pipe output pressure, the second oil outlet is cut off from the traveling valve core; the manual traveling and cruising systems are independent of each other and do not affect each other, thereby improving safety and stability.

[0017] Specifically, the rocker switch 2 is a three-position self-locking type, the middle position of the rocker switch 2 is the manual travel mode, the cruise system is turned off, the upper position of the rocker switch 2 is the forward cruise mode, and the lower position of the rocker switch 2 is the reverse travel mode.

[0018] Specifically, the controller 1 is electrically connected to an emergency stop button 3, which can be used to stop the vehicle in an emergency.

[0019] Specifically, the controller 1 is an excavator monitor, and the monitor is a traditional excavator monitor, with only a cruise control function added to the internal program, and a high degree of integration.

[0020] Specifically, when the forward cruise is maintained, the user presses the rocker switch 2 to the position of the forward cruise mode, and the rocker switch 2 gives the controller 1 an electrical signal of the forward cruise direction. The user turns on the setting of the cruise switch in the controller 1, and the controller 1 gives the proportional solenoid valve 4 an electrical signal to open the second oil outlet. The proportional solenoid valve 4 receives the electrical signal and outputs hydraulic oil. The hydraulic oil enters the shuttle valve 5 and injects the hydraulic oil into the forward pilot control oil circuit. The pilot control oil circuit pushes the valve core of the main valve 7 for forward travel. The main valve 7 opens, driving the excavator to move forward at a constant speed. When the reverse cruise is maintained, the user presses the rocker switch 2 to the position of the reverse cruise mode, and the rocker switch 2 gives the controller 1 an electrical signal of the reverse cruise direction. The user turns on the setting of the cruise switch in the controller 1, and the controller 1 gives the proportional solenoid valve 4 an electrical signal to open the first oil outlet. The proportional solenoid valve 4 receives the electrical signal and outputs hydraulic oil. The hydraulic oil enters the shuttle valve 5 and injects the hydraulic oil into the reverse pilot control oil circuit. The pilot control oil circuit pushes the valve core of the main valve 7 for reverse travel, and the main valve 7 opens, driving the excavator to travel backward at a constant speed; When adjusting the cruising speed, the user changes the speed setting of the controller 1 to 50%, and the controller 1 outputs an electrical signal to the proportional solenoid valve 4. The proportional solenoid valve 4 receives the electrical signal and controls the opening of the corresponding valve port to adjust the pressure of the pilot control oil. The change in the pilot control oil circuit pressure changes the opening of the valve core of the corresponding walking main valve 7, and the excavator's constant speed walking speed changes to 50% of the fastest speed.

[0021] When the cruise control is in emergency stop, the user presses the emergency stop button 3, which transmits an electrical signal to the controller 1. The controller 1 receives the electrical signal of the emergency stop, and the controller 1 sends an emergency stop electrical signal to the proportional solenoid valve 4. The proportional solenoid valve 4 releases pressure, and the valve core of the main valve 7 corresponding to the travel is reset, and the excavator cruise control stops. For installing this device on a conventional excavator, the controller 1 is electrically connected to the proportional solenoid valve 4, the oil inlet of the proportional solenoid valve 4 is connected to the oil pump of the excavator, the first oil outlet of the proportional solenoid valve 4 is connected to the left rear travel oil pipe and the right rear travel oil pipe through the shuttle valve 5, the second oil outlet of the proportional solenoid valve 4 is connected to the left front travel oil pipe and the right front travel oil pipe through the shuttle valve 5, and the cruise control function is upgraded in the internal program of the excavator monitor.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cruise control device for an excavator, comprising a travel pilot valve (6), a controller (1), a proportional solenoid valve (4), and a main valve (7), wherein the left front travel oil outlet of the travel pilot valve (6) is connected to the left travel valve core of the main valve (7) through a left front travel oil pipe, the left rear travel oil outlet of the travel pilot valve (6) is connected to the left travel valve core of the main valve (7) through a left rear travel oil pipe, the right front travel oil outlet of the travel pilot valve (6) is connected to the right travel valve core of the main valve (7) through a right front travel oil pipe, and the right rear travel oil outlet of the travel pilot valve (6) is connected to the right travel valve core of the main valve (7) through a right rear travel oil pipe, characterized in that: The controller (1) is electrically connected to a rocker switch (2), and the controller (1) is electrically connected to a proportional solenoid valve (4); an oil inlet of the proportional solenoid valve (4) is connected to an oil pump of an excavator, a first oil outlet of the proportional solenoid valve (4) is connected to a left rear travel oil pipe and a right rear travel oil pipe through a shuttle valve (5), and a second oil outlet of the proportional solenoid valve (4) is connected to a left front travel oil pipe and a right front travel oil pipe through a shuttle valve (5).

2. The cruise control device for an excavator according to claim 1, characterized in that: The left rear travel oil outlet and the first oil outlet are both in communication with the oil inlet of the corresponding shuttle valve (5), and the oil outlet of the shuttle valve (5) is in communication with the left travel valve core; the right rear travel oil outlet and the first oil outlet are both in communication with the oil inlet of the corresponding shuttle valve (5), and the oil outlet of the shuttle valve (5) is in communication with the right travel valve core; the left front travel oil pipe and the second oil outlet are both in communication with the oil inlet of the corresponding shuttle valve (5), and the oil outlet of the shuttle valve (5) is in communication with the left travel valve core; the right front travel oil pipe and the second oil outlet are both in communication with the oil inlet of the corresponding shuttle valve (5), and the oil outlet of the shuttle valve (5) is in communication with the right travel valve core.

3. The cruise control device for an excavator according to claim 1, characterized in that: The rocker switch (2) is of a three-position self-locking type; the middle position of the rocker switch (2) is a manual walking mode; the upper position of the rocker switch (2) is a forward cruising mode; and the lower position of the rocker switch (2) is a reverse walking mode.

4. The cruise control device for an excavator according to claim 1, characterized in that: The controller (1) is electrically connected to an emergency stop button (3).

5. The cruise control device for an excavator according to claim 1, characterized in that: The controller (1) is an excavator monitor.

6. A cruise control method for an excavator, characterized in that: Cruise hold methods include: The user presses the rocker switch (2) to a position corresponding to the cruising direction, and the rocker switch (2) gives the controller (1) an electrical signal corresponding to the cruising direction. The user turns on the setting of the cruise switch in the controller (1), and the controller (1) gives the proportional solenoid valve (4) an electrical signal to open the corresponding oil outlet. The proportional solenoid valve (4) receives the electrical signal and outputs hydraulic oil. The hydraulic oil enters the shuttle valve (5) and injects the hydraulic oil into the pilot control oil circuit of the corresponding direction. The pilot control oil circuit pushes the valve core of the main valve (7) corresponding to the travel direction. The main valve (7) opens, and the excavator is driven to travel at a constant speed. The cruise speed adjustment methods include: The user changes the speed setting of the controller (1) to the corresponding speed, and the controller (1) outputs an electrical signal to the proportional solenoid valve (4). The proportional solenoid valve (4) receives the electrical signal and controls the opening of the corresponding valve port to adjust the pressure of the pilot control oil. The change in the pressure of the pilot control oil circuit changes the opening of the valve core of the corresponding travel main valve (7), and the excavator's constant travel speed is changed to the corresponding speed.

7. The method for controlling cruise speed of an excavator according to claim 6, characterized in that: The emergency stop methods of cruise control include: The user presses the emergency stop button (3), the emergency stop button (3) transmits an electrical signal to the controller (1), the controller (1) receives the emergency stop electrical signal, the controller (1) sends an emergency stop electrical signal to the proportional solenoid valve (4), the proportional solenoid valve (4) releases pressure, the valve core of the main valve (7) corresponding to the travel is reset, and the excavator stops the cruise control.

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