JPS5968447A - Automatic tester for power shovel - Google Patents

Abstract

PURPOSE:To monitor performance testing by a computer by a method in which a lifting force and a mimic external force are given to an oil-pressure shovel, a sensor is provided to each testing portion of the oil-pressure shovel, and each detected value is displayed through a controller storing working programs. CONSTITUTION:A lifting force is given to an oil-pressure shovel body 11 by an oil-pressure cylinder 25, and also a slewing force is given to the shovel body 11 by a slewing stay force cylinder 24. To the oil-pressure shovel 11, an oil temperature sensor 18, an engine rotation sensor 19, an oil pressure sensor 20, a slewing sensor 21, and a clawler running sensor 22 are provided, and detected values from each sensor and detected values from the cylinder provided with external force and lifting force are put in the controller 23. When working is advanced by the switch 17, the working is advanced by working procedure programs stored and each detected value is displayed on a displayer 15 and a printer 14. Performance testing and inspection can be attained by computer monitoring system.

Description

[Detailed description of the invention] The present invention relates to an automatic inspection device for power shovels.

Traditionally, power excavator performance tests, finished vehicle inspections on the production line, and tests are carried out by mounting measuring instruments on the test machine (power excavator) and conducting it under actual running and operating conditions at a test site, etc. Alternatively, partial measurements were carried out while reproducing the operating conditions in a fixed location. Therefore, the former requires large-scale test site facilities (level ground, sloped ground, and running space), requires a person in addition to the driver to measure the equipment, and requires complicated reading of instruments while driving and data collection, which makes testing difficult. It took a long time. Furthermore, there were many problems such as the danger involved during the test and the need to wash off dirt, dust, etc. that had adhered to the test machine after the test, such as during rainy weather. Also, in the latter case, each measurement task involved manual operations such as attaching and detaching the measuring instrument, reading the measuring instrument, and operating the test equipment, so at least two people were required to carry out the work.

The present invention was proposed in view of the above-mentioned circumstances, and it automates the artificial part of the performance test and inspection of Noya Works excavators by computer monitoring and makes it a stationary type, which improves accuracy, reduces time, and saves labor. It can be combined with the production line and streamlined, similar to the finished automobile inspection line. The purpose is to provide automatic inspection equipment for work shovels.

The automatic inspection device for excavators according to the present invention includes a means for applying a lifting force and a simulated external force to the hydraulic excavator body, a group of sensors arranged in each inspection section of the hydraulic excavator, and a device connected to each of the above sensor groups for operation. It is characterized by comprising a subsidiary device that programs the order and progresses the work sequentially using operation switches, and a display device and a printer that are connected to the subsidiary device and perform work commands, measurements, and data display.

To explain the features of the present invention in more detail, it is configured as follows: (1) By inputting the model layer of the test machine, the work order, work instructions, and pass/fail judgment criteria for measured values are stored in advance in the computer. The system extracts the values, etc., and automatically operates the inspection equipment and test machine according to the work order and instructions.

(2) The work order and instructions are displayed on a cathode ray tube, etc., and instructions are given to the operator, and the inspection device also works in conjunction, and the measurement results (measured values, standard value 2 pass/fail judgment) are displayed on the cathode ray tube, etc. and printer.

(3) In order to reproduce the actual operating conditions in each performance test and inspection item of the test machine, a simulated external force is automatically applied by the test device.

(4) In addition to displaying the measurement results using the display method described in section (2), they can also be stored in the storage device of this inspection device and processed, for example, by statistical processing, that is, by statistically processing the measurement data of various test machines. , pointing out defects in the manufacturing process.

An embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic diagram of the external appearance of a power shovel, FIG. 2 is a schematic diagram showing a schematic configuration of an embodiment of the present invention, and FIG. 3 is a system configuration diagram of a group of control devices according to an embodiment of the present invention. FIG. 4 is a flowchart showing the flow of work in one embodiment of the present invention.

In Figures 1 and 3, 1 is a swing frame, 2
is the cab, 3 is the drive sprocket, 4 is the idle wheel, 5 is the crawler (caterpillar), 6 is the boom, 7
is arm, 8 is packet, 1 is /? A quaybell (sample AM), 12 is a control device, 13 is a display device 1 (CRT)
), 74 is a printer, 15 is a display device 11 (CRT
), 16 is a sensor box, 17 is a pendant (operating titanium), 18 is an oil temperature sensor, 19 is an engine rotation sensor, 20 is an oil pressure sensor, 21 is a turning sensor, 22 is a crawler running sensor, 23 is an oil field device, 24 is a test cylinder for swing retention, 25 is a hydraulic lift, 26 is a computer main body, 27 is an external storage device, 28 is a relay unit, 29 is a key date, and 30 is a clock. This device is composed of the equipment shown in FIG.
A rotating retention test cylinder 24 that applies an external force to the oil field equipment 23, a mechanical device group that supports the so-called test machine 1 and applies a simulated external force, and a display device 1113 centered on the control device display 12 that controls automatic measurement. and a certain dmx
5. A sensor box 16 and various sensors 18 to 22 that take out signals necessary for measurement, a printer 14 that records measurement results, and a pendant 17 that advances the measurement stage.
It consists of 1111Il equipment groups.

Control in Figure 3? To explain the individual functions of the MJ equipment group, the computer main body 26 includes a system for storing reference data and work procedure instructions for various test machines, a circuit for comparing measured values and reference values to determine pass/fail, The computer main body 26 is equipped with a circuit that records measurement data and performs statistical processing of the data, and the computer body 26 includes display devices (CRT') 13 and 15 that display work instructions, measurement data, etc., and an external device that stores measurement data. A storage device (flora disk) 27, a printer 14 for recording measurement data, a pendant 17 that houses operation switches to proceed with the work, a sensor box 16 that catches various signals of the test machine 11, and a test machine 11. A relay unit 28 that operates an external force function device for applying an external force for testing is connected to each of them.

The operation of the above embodiment of the present invention will be explained based on FIGS. 3 and 4. The measurement program for executing the measurement is called from the keyboard 29 of the dividing unit shown in FIG. 3, which is the core of this device, and the display device 13 displays an initial image indicating that preparation is complete.

Next, the image changes to data setting, and here test machine 1 is displayed.
Key yJ? −? When input from 29, external forces for various tests suitable for test machine 11,
The operating instructions and reference values that serve as pass/fail judgment criteria for measurement data are called up, and the next command from the operator is awaited. The operator presses the set button on the pendant 17, selects the measurement mode, that is, the desired test item, and the preparation for measurement is completed. The following operator is the CPU of the control device shown in Figure 3.
Based on the command, the work will automatically proceed according to the work instructions displayed on the display device 13. Here we will explain the work instructions and the movements of each piece of equipment. The sensor set is displayed on the display device 13. Attach the sensor to the test machine 1r as instructed by pressing the set button on the pendant 17, and the image on the display 13 will change to show that the lift width setting is complete (if there is a mismatch in the lift [1] set), press the set button on the pendant 17. When this occurs, we have a system in place to instruct the operator accordingly). Press the step button on the pendant 17 to proceed to the next task. The display device 13 displays a temperature equalization confirmation message and at the same time collects a signal from the previously installed sensor and starts temperature measurement. Press the step button without pausing. (In this case, you will be prompted to press the step button in the temperature confirmation display). The display device 15 moves to the engine RPM stage and reads the engine speed based on the signal from the sensor in the same way as the oil temperature measurement. When the measurement is completed, the display device 15 displays the actual measured values of the oil temperature and engine speed, and the basic The value and pass/fail judgment results are displayed. As mentioned above, the following measurement items are also measured by operating the step button to measure the pressure of the relief valve and measure the front leak (front leak is oil leak from the hydraulic equipment that operates the boom 6, arm 7, and packet 8 shown in Figure 1). ), the speed of the caterpillar, etc. progress sequentially, and when all measurements are completed, all measurement data is displayed again on the display device 15, and after visual confirmation (skip visual confirmation of all measurement data) ) Keyboard 29 shown in Figure 3
By pressing the button, all measurement data reference values and pass/fail judgment results are printed out on the printer 14. If you want to save this data (printed data), press Fail Buttock 1 Zetan on the keyboard 29 in Fig. 3 to store it in the external storage device 27, complete all measurement work, and then press the pendant 17. Press the step button to return the series of measurement programs to the initial position and prepare for the next measurement (inspection) of the test machine.

Here, we will explain how to measure the front leakage and turning retention characteristics related to the hydraulic equipment of the test machine from among the series of measurement items.

As mentioned earlier, front leak is a measure of oil leakage from the hydraulic system that controls the operation of the arms of the test machine.The connector in the middle of the piping is removed, and the connector is connected to the oil leakage shown in Figure 2. This device generates a specified hydraulic pressure and measures the amount of leakage per unit time by detecting the reverse fA amount of the song to the test machine. This back flow is usually a small amount, so in order to ensure accuracy of measurement,
A double-acting oil field cylinder is used, one end is connected to the connector of the test machine, and the specified oil pressure generated by the hydraulic system 23 is applied from the other end. In the fX dynamic hydraulic cylinder, the piston moves by the amount of the test curve. Oil leakage can be determined by installing a sensor that detects the amount of movement in the rod of the piston and measuring the amount of movement at an arbitrary set time using a timer. Next, the turning retention property is determined by the effect of the brake device for fixing the turning of the swing frame 1 shown in Fig. 1.
You can find out by checking the condition. That is, the method is to operate the swing retention test cylinder 24 at one end of the swing frame 1 with a specified pressure while the swing frame 1 is fixed, and to check the flow rate of this cylinder per unit time, similar to the front leak. By detecting the amount of movement, it is possible to know the amount of movement of the swing frame 1, that is, the state of the brake device.

Since the present invention is constructed as described above, it provides the following excellent effects.

(1) This inspection device is 10 Xll (110771
') end part must be removed).

(2) If this device is placed in parallel (2 units), 10″LX
It can be stored in an area of 16 (160m2), and work can be carried out extremely efficiently by deploying two operators and one worker to attach and detach sensors.

(3) If the operator operates the test machine according to the work instructions displayed on the display device based on the CPU's commands, the measurement will be performed automatically, and the operator will be freed from the troublesome task of reading and writing down the pointer of the measuring instrument and numerical values. Not only that, but the measurement data and pass/fail judgment results are displayed on the display each time.
Maintenance, adjustment, etc. for malfunctioning parts can be carried out quickly.

(4) Test items for the test machine include engine speed, pressure of each part of the hydraulic system, running test, front circuit internal seek test, and swing frame swing retention test for a total of 23 items.
The time required to measure the points is within 30 minutes.

(5) Since it is a stationary type without requiring operator skill, the risk during testing is also eliminated.

(6) Noise problems can be solved by using soundproof materials in the examination room.

(7) Test data can be stocked in a storage device, and the statistical processing function allows for easy feedback to the production line by numerically understanding the defective rate and defective locations (measured values), and countermeasures can be taken from the measured data). becomes easier.

In summary, according to the present invention, there is provided a means for applying a lifting force and a simulated external force to the main body of a hydraulic excavator, a group of sensors arranged in each inspection section of the hydraulic excavator, and a device connected to each of the sensor groups to program a work order and operate it. It is equipped with a control device that progresses work sequentially using switches, and a display device and printer that are connected to the control device to give work commands, measurements, and data display, thereby eliminating the need for human intervention in power excavator performance tests and inspections. By automating the parts that had previously been subject to computer monitoring and making them stationary, we improved accuracy, shortened time, saved labor, and leveled out the work process. Similar to the inspection line for finished automobiles, we were able to streamline the process by combining it with the production line. INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because it provides an automatic inspection device for power shovels that can be used to inspect power shovels.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the appearance of a nowa excavator, FIG. 2 is a schematic diagram showing a schematic configuration of an embodiment of the present invention, and FIG. 3 is a system configuration diagram of a control@l device group of an embodiment of the present invention.
FIG. 4 is a flowchart showing the flow of work in one embodiment of the present invention. 1... Swing frame, 2... Cab, 3...
Drive sprocket, 4... Idle wheel, 5
...Crawler (caterpillar), 6...Boom, 7.
...Arm, 8...Packet, 11.../? hoe
Excavator (test machine), 12...control system (CRT)
, 13... Display device 1 (CR, T), 74... Printer, 15... Display device (CRT), 16... Sensor box, 17... Pendant (operation button),
18... Oil temperature sensor, 19... Ennon rotation sensor, 20... Oil pressure sensor, 21... Swivel 1 bow sensor,
22...Crawler running sensor, 23...Hydraulic system, 24...Swivel retention test cylinder, 25...Hydraulic lift, 26...Computer main body, 27...External storage device, 28... ...Relay unit, 29...1000-boat 9, □30...Clock.

Claims (1)

[Claims] a means for applying a lifting force and a simulated external force to the hydraulic excavator body; a sensor group disposed in each inspection section of the hydraulic excavator;
a control device that is connected to each of the sensor groups and programs the work order and sequentially progresses the work using operation switches;
An automatic inspection device for a power shovel, comprising a display device and a printer connected to the control device to issue work commands, measurements, and data display.