JPH0765718B2 - Automatic greasing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic greasing device for a construction machine.

Prior Art FIG. 3 is a greasing circuit diagram showing an automatic greasing device of the prior art. In the figure, 1 is a lower traveling body of a hydraulic excavator, 2
Is an upper revolving structure, 3 is a work attachment mounted on the front part of the upper revolving structure 2, 4 is an electric grease pump, 5
Is a motor for a grease pump, 6 is a grease pump, 7 is a pressure accumulating type grease tank, 8 is a parent distribution valve, 9 and 10 are child distribution valves, 11 is a distribution port of the parent distribution valve 8 and child distribution valves 9 and 10, respectively. , 12 is a greasing port of each part of the hydraulic excavator, 13 is an engine mounted on the hydraulic excavator, 14 is a battery, 15 is a key switch, 16 is a controller, 17 is a switch for automatic greasing / manual greasing, and 18 is Display device when greasing and when an abnormality occurs,
A limit switch 19 is provided for the parent distribution valve 8.

Next, the structure of the prior art automatic greasing device will be described with reference to FIG. An electric grease pump 4 provided with a pressure accumulating grease tank 7 is provided on the upper revolving structure 2 of the hydraulic excavator, the discharge port of the grease pump 6 and the parent distribution valve 8 are communicated with each other, and downstream of the parent distribution valve 8 in sequence. The child distribution valves 9 and 10 were connected in series. Then, the distribution port 11 of each of the distribution valves 8, 9 and 10
And the greasing port 12 of each part of the hydraulic excavator were connected by a greasing pipe. The grease pump 4 is set to be rotatable when the engine 13 is rotationally operated for a set cumulative time.

Next, the function of the conventional automatic greasing device will be described. Turn on the key switch 15 and set the changeover switch 17 to the automatic greasing side. When the engine 13 is operated for the set cumulative time T, the grease pump electric motor 5 is rotated by the counter function of the controller 16. Thereby,
Since the grease pump 6 is rotated, the grease filled in the pressure accumulating grease tank 7 is supplied to each part from the grease pump 6 through the distribution valves 8, 9 and 10, the flow dividing port 11 and the greasing pipe. The oil is sent to the oil port 12 and lubricated automatically. When the above greasing is completed, the limit switch 19 provided in the parent distribution valve 8 operates, so that the switch signal is output to the controller 16.
Therefore, according to a command from the controller 16, the rotation of the grease pump electric motor 5 is stopped, and at the same time, the rotation operation of the grease pump 6 is stopped. In this way, even if the electric grease pump 4 is in a stopped state, the above-described greasing process is repeated again when the engine 13 rotation operating time of the hydraulic excavator reaches the set cumulative time.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When a hydraulic excavator is working, there is a long or short work waiting time such as waiting for a dump truck. In that case, the engine of the hydraulic excavator is rotating,
The operation of each hydraulic actuator is paused. In the conventional automatic greasing device, the greasing is automatically performed when the engine rotation operating time reaches the set cumulative time. Therefore, even if there is a long and short indefinite work waiting time as described above and it is not necessary to lubricate the greasing ports of various actuators, lubrication will be performed when the engine rotation operating time reaches the set cumulative time. It was being appreciated. Therefore, the grease may be wastefully consumed, which is uneconomical.

The present invention solves the above-mentioned problems, and greasing is performed when the engine rotation operating accumulated time when at least one of the plurality of hydraulic actuators provided for the construction machine is in an operating state reaches the set accumulated time. An object is to provide an automatic greasing device.

Means for Solving the Problems Means of the present invention taken to solve the above problems are a. When at least one of the hydraulic actuator operating levers for construction machinery is in the operating state, the counter calculates the cumulative time during which the engine has been rotating, and b. When all the operating levers are in the neutral state while the engine rotational operation accumulated time is being calculated, the counter calculation is set to be stopped for the time in which the operation lever is in the neutral state, and c. The grease pump electric motor is configured to be rotationally operable when the engine rotation operation accumulated time by the counter reaches a set accumulated time.

Action a. The counter, which is provided as a function of the grease pump side controller, stops the calculation of the engine rotation operation accumulated time when all the operation levers for the hydraulic actuator are in the neutral state. Therefore, the engine rotation operation accumulated time does not include the time when all the hydraulic actuators of the construction machine are in a pause.

B. When at least one of the plurality of hydraulic actuator operation levers is in the operated state, the engine rotation operation integrated time is calculated by the counter. Therefore, the set cumulative time of engine rotation operation is set to the time that requires greasing, so when the accumulated running time of engine rotation reaches the above set cumulative time, the motor for the grease pump rotates and greasing is performed. It is done effectively.

First Embodiment FIG. 1 is a control circuit diagram showing an automatic greasing device according to the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. 13 'is the engine
Reference numeral 20 is a governor control device for the engine 13 ', 21 is a fuel injection side controller, 22 is an engine rotation sensor, 23 is a variable displacement hydraulic pump, 24 is a plurality of hydraulic actuators operated by hydraulic oil discharged from the hydraulic pump 23, 25 Hydraulic pump 23
And a hydraulic actuator 24, a directional control valve, 26 is a plurality of operating levers provided corresponding to the hydraulic actuator 24, 27 is an operating lever side controller, and 28 is for setting the rotational speed of the engine 13 '. Throttle lever, 29
Is the engine when the operating levers 26 are all in the neutral position.
Reference numeral 16 'designates a grease pump side controller which switches between a state in which the low speed operation control is performed on 13' and a state in which the low speed operation control is not performed. The fuel injection side controller 21 inputs signals from the throttle lever 28, the engine rotation sensor 22, the operation lever side controller 27, and the changeover switch 29, and outputs signals to the governor control device 20.

Next, the configuration of the automatic greasing device according to the present invention will be described with reference to FIG. When at least one of the operation levers 26 for the plurality of hydraulic actuators 24 provided for the construction machine is in the operating state, the integrated time during which the engine 13 'has been rotationally operated is calculated by a counter (not shown) in the controller 16', When all of the operation levers 26 are in the neutral state in the state in which the rotational operation integrated time of the engine 13 'is calculated, the counter calculation is set to be stopped only for the time in the neutral state. At the same time, the grease pump electric motor 5 is configured to be rotationally operable when the engine rotation operation accumulated time by the counter reaches the set accumulated time T '.

Next, the function and function of the automatic greasing device according to the present invention will be described. The changeover switch 29 is changed to a state in which the low speed operation control is performed, and the changeover switch 17 is changed to the automatic greasing side. When the engine 13 'is rotationally operated and all the operating levers 26 are in the neutral state, a signal from the operating lever side controller 27 is output to the fuel injection side controller 21, thereby instructing the low speed rotation operation of the engine 13'. At the same time, via the fuel injection side controller 21, the grease pump side controller 16 'gives an instruction to stop the calculation of the engine rotation operation integrated time. As a result, the engine 13 '
Performs the low speed rotation operation, and at the same time, the calculation of the engine rotation operation integrated time by the counter is stopped. Therefore,
The engine rotation operation accumulated time does not include the time when all the hydraulic actuators 24 of the construction machine are in a pause. Next, when at least one of the plurality of operation levers 26 is operated, a signal from the operation lever side controller 27 is output to the fuel injection side controller 21, thereby performing the set (high speed) rotation speed operation of the engine 13 '. Order.
At the same time, through the fuel injection side controller 21, the counter of the grease pump side controller 16 'commands the calculation of the engine rotation operation accumulated time. As a result, the engine 13 'performs the set (high speed) rotation operation, and at the same time, the engine rotation operation integrated time is calculated. Therefore, since the set cumulative time T'of the engine rotation operation is set to a time that requires lubrication, when the engine rotation operation integrated time reaches the set cumulative time T ', the grease pump electric motor 5 is rotated. , Greasing is effectively performed.

FIG. 2 is a flowchart showing a method for controlling the grease pump electric motor 5. When the changeover switch 29 is switched to the low speed operation state and the changeover switch 17 is switched to the automatic greasing side and all the operation levers 26 are in the neutral state, A → B → C is repeated to repeat the operation of the engine 13 ′. The low speed rotation operation is instructed and the counter is instructed to stop the engine rotation operation integrated time calculation. As a result, the engine 13 'is operated at a low speed, and the calculation of the engine rotation operation integrated time by the counter is stopped. In this state, if at least one of the operating levers 26 is operated, the engine 1 is repeatedly operated by repeating A → B → D.
A 3'setting (high speed) rotation speed operation is instructed, and the counter is instructed to calculate the engine rotation operation accumulated time. As a result, the engine 13 'is operated at the set (high speed) rotation speed, and the engine rotation operation integrated time is calculated by the counter. When the accumulated time reaches the set accumulated time T'in the state where the engine rotation operation accumulated time is being calculated, E → F occurs, and the operation of the grease pump electric motor 5 is instructed. The electric motor 5 is rotationally operated, and greasing is performed. However, when the engine rotation operation accumulated time does not reach the set accumulated time T ', E → G occurs, and the stop state of the grease pump electric motor 5 is commanded, so that the greasing is not performed.

Effect of the Invention When the hydraulic excavator is working, there is a long or short work waiting time such as waiting for a dump truck. In that case, the engine of the hydraulic excavator is rotating,
The operation of each hydraulic actuator is paused. In the conventional automatic greasing device, the greasing is automatically performed when the engine rotation operating time reaches the set cumulative time. Therefore, even if there are many long and short indefinite work waiting times and it is not necessary to lubricate the greasing ports of various actuators as described above, lubrication is performed when the engine rotation operating time reaches the set cumulative time. Was there. Therefore, the grease may be wastefully consumed, which is uneconomical.

However, in the automatic greasing device according to the present invention, when all of the construction machine operation levers are in the neutral state, that is, when the operations of the various hydraulic actuators are all paused, the engine rotation operation accumulated time by the counter The calculation of was stopped. Then, when at least one of the plurality of hydraulic actuators is in the operating state, the engine rotation operation accumulated time reaches the set accumulated time, the lubrication is automatically performed.

Therefore, in the automatic greasing device according to the present invention, since the interval time of greasing is rationally set, wasteful consumption of grease is prevented, and resource saving and economy are improved.

[Brief description of drawings]

FIG. 1 is a control circuit diagram showing an automatic greasing device according to the present invention, FIG. 2 is a flowchart showing a method of controlling a motor for a grease pump, and FIG. 3 is a greasing device showing a conventional automatic greasing device. It is a circuit diagram. 4 …… Electric grease pump 5 …… Grease pump electric motor 7 …… Accumulator grease tank 8,9,10 …… Distribution valve 11 …… Shunting port 12 …… Grease opening 13,13 ′ …… Engine 16, 16 ′, 21,27 …… Controller 17,29 …… Changeover switch 24 …… Hydraulic actuator 26 …… Operating lever

Continuation of front page Examiner Hiroto Kido

Claims (1)

[Claims] 1. An electric revolving grease pump having a pressure-accumulation type grease tank is provided on an upper swing body of a construction machine, the grease pump discharge port and various distribution valves are communicated with each other, and each of the distribution valves has a shunt port. An automatic greasing device in which the grease pump is set to be rotatably operated when the engine is rotatably operated for a set cumulative time by communicating the greasing ports of the construction machine with greasing pipes. When at least one of the operating levers for multiple hydraulic actuators provided for construction machinery is in the operating state, the counter calculates the cumulative time that the engine has been running, and the cumulative running time of the engine is being calculated. When all of the above operating levers are in the neutral state, the counter calculation is set to be stoppable for the time in which the neutral state is maintained. Serial counter automatic lubricator device characterized by an electric motor grease pump was configured to be rotatable activated when the engine operating accumulated time reaches the set accumulated time by.