JPH061458U - Speed control equipment for construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the operability of speed control of the engine and hydraulic pump of construction machinery. Constitution: A variable resistor is provided on the operating lever, a controller is connected to the variable resistor, and the controller is connected to an actuator on the engine side and an actuator on the hydraulic pump, respectively, and the variable resistor is provided on the operating lever. By changing the value, the engine speed and the discharge pressure of the hydraulic pump are simultaneously controlled. Further, a hydraulic pressure reducing valve is used instead of the variable resistor and the controller, and the engine speed and the discharge pressure of the hydraulic pump are simultaneously controlled by operating the hydraulic pressure reducing valve.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speed control device for a construction machine or the like, and in particular, a speed control device for a construction machine or the like that can simultaneously control the engine speed and the discharge pressure of a hydraulic pump by using one operation lever. It is about.

[0002]

[Prior art]

 A conventional speed control device for this type of construction machine will be described with reference to FIG. In the figure, 1 and 2 are operation levers, one operation lever 1 is provided on the hydraulic pump 3 side, and the other operation lever 2 is provided on the engine 4 side. Therefore, by operating one of the operation levers 1, the discharge pressure of the hydraulic pump 3 is changed via the pump discharge amount variable lever 5.

Further, when the other operation lever 2 is operated, the resistance value of the variable resistor 6 changes, the rotation speed of the slot motor 7 is changed, and the rotation speed of the engine 4 is changed via the governor lever 8. I have to.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional construction machine, the operating lever on the hydraulic pump side and the operating lever on the engine side are individually operated to control the speed separately.Therefore, it is necessary to change the operating lever in each case. The operability of speed control of construction machinery is extremely troublesome.

Therefore, there arises a technical problem to be solved in order to improve the operability of the speed control of the construction machine, and the present invention aims to solve the problem.

[0006]

[Means for Solving the Problems]

 The present invention has been proposed to achieve the above-mentioned object, and a variable resistor is attached to an operation lever of a construction machine, a controller is coupled to the variable resistor, and the operation lever is operated to operate the variable resistor. The drive signal output from the controller is output to the engine side actuator and the hydraulic pump side actuator, respectively, and the actuators to which the drive signal is input respectively control the engine speed and the hydraulic pump discharge pressure at the same time. A speed control device for a construction machine or the like configured such that a hydraulic pressure reducing valve is used in place of the variable resistor and the controller, and hydraulic pressure reducing valves, an engine side actuator and a hydraulic pump side actuator are respectively provided with hydraulic piping. The engine speed and hydraulic pump discharge pressure are controlled simultaneously by operating the hydraulic pressure reducing valve. It is intended to provide Hisage speed control device configured construction machine to allow Rukoto.

[0007]

[Action]

 According to the first aspect of the present invention, when the variable resistor attached to the operating lever is operated, the resistance value of the variable resistor is changed and a drive signal is output to the controller. The controller that receives the drive signal outputs the drive signal to the actuators on the engine side and the hydraulic pump side, and the respective actuators simultaneously change the engine speed and the hydraulic pump discharge pressure separately.

Further, according to a second aspect of the present invention, by operating the hydraulic pressure reducing valve, the engine-side actuator and the hydraulic pump-side actuator, which are connected to the hydraulic pressure reducing valve by hydraulic pipes, respectively, simultaneously rotate the engine speed. And the discharge pressure of the hydraulic pump is changed.

[0009]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a vertical sectional front view showing a turning operation lever 10 of a crane. A variable resistor 11 is attached to the turning operation lever 10, and a grip 12 is rotatably fitted on the turning operation lever 10 in order to change the variable resistor 11, and A gear 13 is provided in the portion, a gear 14 connected to the variable resistor 11 is meshed with the gear 13, and the electric resistance value of the variable resistor 11 is changed by the rotation of the gear 14. There is.

On the other hand, a controller 15 is connected to the variable resistor 11. The controller 15 inputs an electric signal based on a change in the electric resistance value of the variable resistor 11, and an actuator 17 including a throttle motor and a governor lever on the engine 16 side and an electromagnetic proportional valve on the hydraulic pump 18 side. The actuator 17 on the engine 16 side changes the rotational speed of the engine 16, and the actuator 17 on the side of the hydraulic pump 18 changes the rotational speed of the engine 16. The discharge pressures of 18 can be changed simultaneously. Thus, by arbitrarily rotating the grip 12 provided on the turning operation lever 10, the electric resistance value of the variable resistor 11 changes, and an electric signal based on the change amount is input to the controller 15, In response to the electric signal, the controller 15 outputs drive signals to the actuator 17 on the engine 16 side and the actuator 19 on the hydraulic pump 18 side, and as described above, the rotational speed of the engine 16 and the discharge pressure of the hydraulic pump 18 are output. It becomes possible to control and at the same time.

Next, an embodiment of the invention according to claim 2 will be described with reference to FIG. In the figure, 20 is a hydraulic pressure reducing valve. The hydraulic pressure reducing valve 20 is used in place of the variable resistor 11 and the controller 15 shown in FIG. Therefore, the hydraulic pressure reducing valve 20 is hydraulically connected to the actuator 17 on the engine 16 side and the actuator 19 on the hydraulic pump 18 side, respectively. Thus, when the lever 20a of the hydraulic pressure reducing valve 20 is operated, the actuator 17 on the engine 16 side and the actuator 19 on the hydraulic pump 18 side simultaneously operate due to the operation of the hydraulic pressure reducing valve 20, and the engine 16 It is possible to simultaneously change the number of revolutions and the discharge pressure of the hydraulic pump 18.

Although the turning operation lever 10 is used as the operation lever according to the first aspect, it should not be limited to this, and the present invention can be modified in various ways without departing from the spirit of the invention. It can be done, and it is obvious that this invention extends to the modified version.

[0013]

[Effect of device]

 As described in detail in the above one embodiment, the present invention can simultaneously control the engine speed and the hydraulic pump discharge rate by operating the lever with one hand. In addition, since the rate of change in the discharge rate of the hydraulic pump can be set arbitrarily, it is possible to freely control from engine high idle and maximum pump maximum discharge speed to engine idling and pump minimum discharge. It is a device that has various practical value, such as contributing to the improvement of

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical front view of a turning operation lever showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of the device according to claim 1.

FIG. 3 is a block diagram showing an embodiment of the device according to claim 2;

FIG. 4 is a block diagram of a conventional speed control.

[Explanation of symbols]

 10 Swiveling Operation Lever 11 Variable Resistor 15 Controller 16 Engine 17 Engine Side Actuator 18 Hydraulic Pump 19 Hydraulic Pump Side Actuator 20 Hydraulic Pressure Reducing Valve

Claims (2)

[Scope of utility model registration request] 1. A variable resistor is attached to an operating lever of a construction machine, a controller is coupled to the variable resistor, and a drive signal output from the controller by operating the operating lever outputs a drive signal from an engine side actuator and a hydraulic pressure. The construction machine characterized in that the actuators, which respectively output to the pump side actuators and receive the drive signals, are configured to be able to simultaneously control the engine speed and the discharge pressure of the hydraulic pump, respectively. Speed control device. 2. A hydraulic pressure reducing valve is used in place of the variable resistor and the controller, and the hydraulic pressure reducing valve is connected to the actuator on the engine side and the actuator on the hydraulic pump by hydraulic piping, respectively, to operate the hydraulic pressure reducing valve. A speed control device for a construction machine, wherein the speed control device is capable of simultaneously controlling the engine speed and the hydraulic pump discharge pressure.