JPH10237905A - Construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to confirm a kind of a replaced attachment by operator, etc., in a construction machinery capable of replacing the working attachment for a machine body. SOLUTION: A kind of a working attachment 2 mounted on a machine body is read with a controller 12 from a connector 23 mounted on the working attachment 2 to discriminate automatically. The controller 12 controls hydraulic pumps 5 and 6 of anoil pressure source for supplying operating fluid to the working attachment 2 in accordance with the kind and a driving engine 7. An indicator 27 for indicating the kind, etc., of the working attachment discriminated by the controller 12 is connected thereto. The indicator 27 is equipped with a confirmation switch on the premise that control is started with the controller 12 and a reset switch for making input processing again in the case an error is indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine capable of displaying the type of an attachment mounted on an airframe.

[0002]

2. Description of the Related Art As shown in FIG.
Compared to the airframe 1 composed of the lower traveling body 1a, the upper revolving superstructure 1b, the cab 1c, the boom 1d of the front work machine and the arm 1e, various work attachments (for example, breakers) 2 are used instead of the front work machine bucket. It is mounted so that it can be easily attached and detached, and is used for various operations. The boom 1d is vertically rotated by a boom cylinder 1dc.

[0003] The work attachment 2 is a kind of hydraulic actuator, and has specific operating conditions (rated supply oil pressure and flow rate). It is necessary to correspond to each. For example, even with the same type of work attachment 2, the required rated supply oil pressure and flow rate are different if the maker and the capacity are different, and the optimal operating conditions are determined for each work attachment.

In the specification and drawings of Japanese Patent Application No. Hei 7-263146, the present applicant automatically determines the type of work attachment when various work attachments are mounted on the front portion of such a hydraulic shovel. do it,
We have proposed a control circuit that allows one-touch settings such as pump discharge pressure and flow rate required for each attachment.

[0005]

However, there is a problem that it is impossible to determine whether information such as the type of the attachment is correct for the operator.

For example, when a malfunction occurs in a part of the control circuit or when an erroneous attachment is attached, an appropriate flow rate cannot be supplied to the attached attachment, and the function of the original attachment is impaired. Cause problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a construction machine capable of automatically determining the type of a work attachment that has been exchanged for an airframe and confirming the result of the automatic determination by an operator or the like. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION According to the present invention, in a construction machine in which a work attachment is exchangeably mounted on a machine body, the type of the work attachment attached to the machine body is determined. A construction machine comprising: a control device that controls a hydraulic pressure source that supplies hydraulic oil to a work attachment according to a type; and a display device that is connected to the control device and that displays a type of the work attachment determined by the control device. It is.

Since the type of the work attachment attached to the machine body is displayed on the display device through the control device, the operator or the like sees this, and the correct work attachment is mounted, and the control device determines that. Make sure that

According to a second aspect of the present invention, the display device of the construction machine according to the first aspect has a confirmation switch which is a prerequisite for starting control by the control device.

[0011] Then, by operating the confirmation switch, the controller is instructed to confirm that the correct attachment of the work attachment has been attached, and control of the controller is started. Inappropriate control of the hydraulic pressure source (such as the flow rate supplied to the attachment) is prevented when the control is performed by misidentifying the wrong type.

According to a third aspect of the present invention, the display device of the construction machine according to the first or second aspect has a reset switch for performing an input process again when an error is displayed.

When the control device recognizes an unregistered code, an error is displayed on the display device. In this case, the input process is performed again by operating the reset switch, and the contact failure is detected. Also responds to such defects.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a connector according to an embodiment of the present invention; FIG.

As shown in FIG. 1A, a work attachment (hereinafter simply referred to as an attachment) 2 such as a breaker (hydraulic hammer) removably attached to the body 1.
, A control valve 4 is connected to another hydraulic actuator (boom cylinder) 1dc, and a hydraulic pump 5, which supplies hydraulic oil to these control valves 3, 4, 6 are provided.

The discharge flow rates of these hydraulic pumps 5 and 6 are as follows:
It is controlled by the engine speed adjusted by the accelerator position of the accelerator actuator 8 of the diesel engine 7 and the pump set horsepower adjusted by the pump regulators 9 and 10.

The flow control valve 11 installed on the downstream side of the center bypass line of the control valve 3 is connected to the pump regulators 9 and 10 when the pressure signal on the upstream side is connected thereto. A so-called negative flow rate control in which the pump flow rate becomes small and the pump flow rate becomes large when the pressure is small is performed. In FIG. 1A, these connections are omitted.

An accelerator actuator 8 and pump regulators 9 and 10 are controlled by an output signal from a control device 12 provided in the body 1. That is, the pump regulators 9 and 10 convert the output current from the control device 12 into hydraulic pressure by the electromagnetic proportional valves 13 and 14 and control the hydraulic pressure.

An accelerator dial 15 for an operator such as a hydraulic excavator to manually adjust the rotational speed of the engine 7 is connected to the control device 12, and a sensor 16 for detecting the rotational speed of the engine 7 is similarly controlled. Connected to device 12.

Then, a signal from the accelerator dial 15 is input to the control device 12, and the number of revolutions of the engine 7 is
, And this signal is similarly input to the control device 12.

Here, the set value of the rotational speed of the accelerator dial 15 is compared with the actual engine rotational speed from the sensor 16, and
The control device 12 calculates a signal that causes the accelerator actuator 8 to make a coincidence, and outputs the signal to the accelerator actuator 8.

If the accelerator is at its maximum and the engine speed is equal to or higher than the rated value, the control device 12 outputs a signal for increasing the pump output, and inputs the hydraulic signals converted by the electromagnetic proportional valves 13 and 14 to the pump regulators 9 and 10. If the engine speed falls below the rated value, a signal for lowering the pump output is output, and the hydraulic pumps 5 and 6 are controlled so as not to exceed the engine output.

The control valve 3 is pilot-operated by, for example, a pedal-type operating device 21, and the control valve 4 is pilot-operated by, for example, a lever-type operating device 22.

The discharge flow rates of the hydraulic pumps 5 and 6 are controlled by the engine speed adjusted by the accelerator actuator 8 of the diesel engine 7 and the pump horsepower adjusted by the pump regulators 9 and 10.

The accelerator actuator 8 and the pump regulators 9 and 10 are controlled by output signals from the control device 12. The pump regulators 9 and 10 convert the output current from the control device 12 into hydraulic pressure by electromagnetic proportional valves 13 and 14 and control the hydraulic pressure.

The input side of the control device 12 includes an accelerator dial 15 for setting the engine speed, a speed sensor 16 for detecting the speed of the engine 7, and a plurality of pump controls set and stored in the control device 12. A connector 23 for selecting a pump control condition according to the attachment 2 to be used from the conditions is connected.

The connector 23 is attached to the attachment 2 and sets a unique bit pattern for each attachment 2 depending on whether or not the plurality of cables 23a are grounded (1, 0). Connector on this attachment side
23 and the control device 12 provided on the construction machine main body side are connected by a harness 23b.

In the figure, the cable 23a and the harness 23
Although only four b's are shown, their number is set to a number that sufficiently satisfies the total number of attachments to be attached.

The pump control conditions output from the control device 12 are determined by the engine speed controlled by the accelerator position of the engine 7 that drives the hydraulic pumps 5 and 6, that is, the operation amount of the accelerator actuator 8, and the pump regulators 9 and 10. Such as the pump horsepower being controlled.

The control device 12 controls the hydraulic pressure source based on the data set by the connector 23. The hydraulic pressure source is formed by hydraulic pumps 5 and 6, a pump noise engine 7, an accelerator actuator 8, and pump regulators 9 and 10.

FIG. 1B is a pump horsepower characteristic diagram showing the relationship between the discharge pressure and the discharge flow rate of the hydraulic pumps 5 and 6, and the constant pump horsepower PS1 = b is stored in the memory of the control device 12.
Since the curve data of 1, b2, ..., bN is stored,
From these constant horsepower curves, based on the curve specified by the bit pattern specific to the currently used attachment set by the connector 23, the pressure for each attachment,
Pumps 5 and 6 are controlled by selecting and outputting condition values such as a flow rate.

A pressure switch 24 serving as a detector for detecting the operation state of the control valve 3 of the attachment 2 based on whether or not the control valve 3 of the attachment 2 is operated is provided in a pilot circuit of a pedal type operation device 21 for supplying a pilot pressure to the control valve 3 for controlling the attachment 2. , 25 are provided.

The pressure switches 24 and 25 are connected to the input side of the control device 12 by a connection circuit. This pressure switch 24,
The control device 12 outputs the pump control conditions set by the connector 23 in response to a signal indicating that there is an operation from the connector 25.

A boom lowering side pilot circuit of a lever type actuator 22 for supplying a pilot pressure to the control valve 4 for controlling the boom cylinder 1dc is provided as a detector for proportionally detecting the operation state of the control valve 4 of the boom cylinder 1dc. Pressure sensor
26 will be provided. This pressure sensor 26 is connected to the input side of the control device 12 by a connection circuit.

Next, the controller 12 determines the type of the attachment 2 attached to the body 1 and controls the hydraulic pumps 5 and 6 and the engine 7 which form a hydraulic source according to the type. A display device 27 is connected to the control device 12, and the type of the attachment 2 determined by the control device 12 and the like are displayed on the display device 27.

As shown in FIG. 2, when the lever type operation device 22 is operated to lower the boom, the control device 12 controls the control valve 4 of the boom cylinder 1dc detected by the pressure sensor 26.
Has a calculation function of adding the correction control condition calculated according to the operation state of the above to the selected pump control condition.

Next, the operation of the circuit shown in FIG. 1 will be described.

A connector 23 having a plurality of cables 23a in which a bit pattern unique to each attachment (for example, a breaker) 2 is set in advance. The bit pattern is set depending on whether the cable 23a is grounded or not.

At the construction site, after the attachment is mounted, the setting of the pump control conditions is completed by a simple operation of merely connecting the connector 23 on the attachment side and the control device 12 installed on the body side by the harness 23b. .

The control device 12 stores various set values in advance so as to correspond to each input bit pattern, and stores specific set values corresponding to the input in the control device.
Output from 12. The set values are the accelerator position of the engine 7 and the horsepower of the pumps 5, 6.

For example, as shown in FIG. 2 (step numbers are represented by circled numbers), the bit pattern is replaced with a numerical value CD, and when any one of the numerical values CD = 1 to N is input (step 1). YES), preset
Select a corresponding one from the conditions of CD = 1 to N, and set the accelerator position ACC1 = a1, a2,..., AN, and the pump horsepower
PS1 = b1, b2,..., BN are called one by one (step 2). If the boom cylinder 1dc is stopped in step 3 (NO in step 3), the accelerator position ACC1 And the pump horsepower PS1 is output from the control device 12.

This will be described with reference to FIG. 1. The operation of the attachment 2 is performed by a pedal type operation device 21,
By depressing the pedal type operation device 21, a pilot oil pressure corresponding to the operation amount of the depression operation is output, and the control valve 3 connected thereto through a pilot pressure output circuit is operated by a pilot operation. Oil is supplied to the attachment 2 according to the operation amount.

At this time, an operation signal detected by the pressure switches 24 and 25 is input from the pilot pressure output circuit of the pedal-type operation device 21 to the control device 12, and the control device 12 operates the pedal-type operation device 21. And outputs a preset value (ACC1, PS1).

The accelerator signal output from the control device 12 is input to the accelerator actuator 8 and the engine 7
Control the accelerator position. Also, the pump drive signal is
The hydraulic pressure is input to the electromagnetic proportional valves 13 and 14 and converted into hydraulic pressure. The hydraulic pressure is input to the pump regulators 9 and 10 to control the horsepower of the hydraulic pumps 5 and 6.

Next, a case will be described in which another actuator, here the boom cylinder 1dc, is operated simultaneously with the attachment 2.

When using the attachment 2, a boom
It is efficient to move 1d downward and press the attachment (breaker) 2 against the object, which is efficient, and the demand for such an operation is high. In such a case, the boom cylinder
An electric signal of a pressure sensor 26 installed in a boom lowering side pilot pressure output circuit of a manual lever type operation device 22 for driving 1dc is input to the control device 12.

The pilot pressure output circuit of the lever type operation device 22 is connected to the control valve 4 and drives the control valve 4 to supply the discharge hydraulic oil of the hydraulic pumps 5 and 6 according to the operation amount to the boom cylinder.
Supply 1dc.

Then, when the boom cylinder 1dc is contracted (boom 1d is lowered), the pump discharge flow rate is increased so that the driving speed of the boom cylinder 1dc according to the signal of the pressure sensor 26 is obtained.

That is, as shown in FIG. 2, when the boom cylinder 1dc is operated simultaneously with the attachment 2 (YES in step 3), the accelerator position ACC1 selected in step 2 is added to the accelerator position ACC1 by A · f ( BM) to calculate the corrected accelerator position ACC, and by adding the pump horsepower increase B · f (BM) to the pump horsepower PS1 selected in step 2, the corrected pump position ACC is calculated. The horsepower PS is calculated (step 4). A and B are increase factors, and f (BM) is a lever type actuator.
Is a function of the amount of operation.

The correction value (AC
C, PS) from the control device 12, the pump discharge flow rate increases, and the attachment 2 and the boom cylinder 1dc
And can be operated simultaneously.

Next, FIG. 3 shows a circuit (attachment automatic determination display circuit) for automatically determining and displaying the type and the like of the attachment 2 mounted on the body 1.
The structures of the control device 12 and the display device 27 forming the automatic determination display circuit will be described.

The control unit 12 has a central processing unit (hereinafter referred to as a CP).
U31), an input / output device (I / O) 32 to which the harness 23b of the connector 23 is connected, and a read-only memory (hereinafter referred to as a ROM 33) storing a processing program.
And a random access memory (hereinafter referred to as R) that stores information (referred to as unique information) such as a type, a rated flow rate, and a pressure unique to each attachment 2 obtained from the connector 23.
AM34) and pump regulators 9 and 10
35 that drives the pump through the electromagnetic proportional valves 13 and 14 to control the set horsepower of the pump, and a driver 36 that drives the accelerator actuator 8 of the hydraulic power source to control the rotation speed of the engine 7
And input / output devices (I / O) 37, 38,
39 and are connected. The controller 12 determines the type of the attachment 2 and the like.

The ROM 33 also stores a program to be described later for automatically determining the type of the attachment attached to the machine.

The display device 27 is connected to an input / output device (I / O) 37, 38, 39 of the control device 12 by a signal line with respect to a central processing unit (hereinafter referred to as a CPU 41). (I / O) 42, 43, 44, a read-only memory (hereinafter referred to as ROM 45) storing a processing program,
A random access memory (hereinafter referred to as R) that stores unique information such as the type of the attachment 2 obtained from the control device 12.
AM46), a display 47 such as a liquid crystal display for displaying unique information such as the type of the attachment 2, the rated flow rate and the pressure, a confirmation switch 48 which is a premise for starting control by the control device 12, and an error display. A reset switch 49 for performing input processing again is connected.

CPU 41 and input / output device (I / O) 42,
43 and 44 perform input processing of unique information relating to the type of the attachment 2 and the like.

When the type of the attachment displayed on the display 47 is correct, the confirmation switch 48 is pressed to start operation, so that a normal function can be obtained.

On the other hand, the reset switch 49 is
By operating the reset switch 49 in response to the "error" display on the display 47 in the case where the discrimination processing of the type or the like cannot be performed, the type or the like is discriminated again.

Next, a processing program of the attachment automatic discrimination display circuit shown in FIG. 3 will be described with reference to the flowcharts shown in FIGS. Note that circled numbers in the flowchart indicate step numbers.

When the attachment 2 is mounted on the machine body 1 and the power of the control device 12 is turned on, the program of the control device 12 shown in FIG. 4 starts.

Wait until the signal is stabilized (step 1
1), set the flag = 0 (step 12), judge the data transmission end flag = A (step 13), and input a code from the circuit of the connector 23 connected to the control device 12 (step 14). The code is checked (step 15), and it is determined whether the code is normal (step 16). If the code is normal (YES in step 16), an address where detailed information of the code is stored is set (step 17). The information is transmitted to the display device 27 in order from this address (steps 18 to 2).
3).

When data transmission to the display device 27 has been completed (YES in step 20), a data end code is output (step 24), a flag = A is set (step 25), and the process returns to step 13.

After confirming the display on the display 47, the operator operates the confirmation switch 48 to input a confirmation signal from the display device 27 to the control device 12 (step 26). If the confirmation signal has been input (YES in step 27), the process proceeds to the control program (step 28), and FIG.
The control related to the engine speed and the pump horsepower shown in the flowchart is started.

On the other hand, if the code is not normal (NO in step 16), a data start code is output (step 2).
9) A "error" signal is transmitted to the display device 27 (step 30), a data end code is output (step 31), and the control device is operated by operating the reset switch 49 on the display device 27.
Upon receiving the reset signal input to 12 (YES in steps 32 and 33), the process returns to step 14 via steps 34 and 13 and retry the program from the code input.

Next, FIG. 5A shows a processing program on the display device 27 side. In the display device 27, the data from the control device 12 is input from the input of the data start code to the input of the data end code. The information is temporarily stored in the RAM 46 (steps 41 to 44), and then the data is sequentially called from the RAM 46 (step 45), converted into a character code (step 46), and displayed on the display (step 4).
7).

The operator checks the displayed contents,
If correct (YES in step 48), confirm switch 48
Is pressed, and this information is fed back to the control device 12 (step 49).

On the other hand, if an error is displayed (YES in step 50), the reset switch 49 is pressed, and this information is also fed back to the control device 12 (step 51).

The code information is transmitted to the display device 27 using a code such as a hexadecimal code CA = C (when an ASCII code is used), as shown in FIG. On the display 47, "Hammer A
BC990D ".

As a display method, a display such as "HAMMER990D" may be displayed for the English language zone.
Further, as the content displayed on the display 47, the flow rate and the pressure of the hydraulic oil supplied to the attachment 2 are also possible.

Next, FIGS. 6 to 11 show attachment 2
Shows an embodiment in which a transmitter is attached instead of the connector 23. The same parts as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, a transmitter 51 mounted on the attachment 2 in advance is connected to the input side of the control device 12 provided on the body 1 of the excavator.

The transmitter 51 includes hydraulic source drive data (hereinafter referred to as unique information) set in the controller 12 to obtain unique operating conditions (supply oil pressure, flow rate, etc.) required by the attachment 2 of the mounting base. ) Is stored in advance.

The control device 12 receives and stores the unique information transmitted from the transmitter 51, and is formed by the hydraulic pumps 5, 6, the pump noise engine 7, the accelerator actuator 8, and the pump regulators 9, 10. To control the hydraulic pressure source.

The specific information set in the control device 12 is controlled by the position of the accelerator actuator 8 (accelerator position) for controlling the engine speed of the engine 7 for driving the hydraulic pumps 5 and 6, and the pump regulators 9 and 10. Pump set horsepower, increase coefficient, etc. The increase coefficient is the accelerator position correction coefficient A or the pump horsepower correction coefficient B shown in FIG.

FIG. 7 shows an example of the control device 12 and the transmitter 51 forming the automatic attachment discriminating circuit. The control device 12 on the fuselage side is connected to a central processing unit (hereinafter referred to as CPU 52) on the attachment side. A data communication interface (hereinafter referred to as COM53) as a transmission means for performing serial communication with the transmitter 51, a read-only memory (hereinafter referred to as ROM54) storing a processing program, and unique information transmitted from the transmitter 51 A random access memory (hereinafter referred to as a RAM 55) for storing hydraulic pressure, a driver 56 for controlling the pump set horsepower by driving the pump regulators 9 and 10 of the hydraulic source via the electromagnetic proportional valves 13 and 14,
A power source unit (hereinafter, referred to as a power unit 58) is connected to a driver 57 that drives the accelerator actuator 8 of the hydraulic pressure source to control the number of revolutions of the engine 7, and supplies electric power thereto.

On the other hand, the transmitter 51 is provided with a read-only memory (hereinafter referred to as a ROM 61) as a data storage device for storing unique information relating to each of the attachments 2, and a central processing for taking out the unique information from the ROM 61. Device (hereinafter, referred to as a CPU 62) and a control device 12
A data communication interface (hereinafter referred to as COM63) as a transmission means for receiving an extraction command signal from the ROM 61 to the CPU 62 by wire and transmitting the unique information extracted from the ROM 61 to the CPU 62 to the control device 12 by wire;
And a power supply unit (hereinafter, referred to as a power unit 64) that receives power supply from the power unit 58 of FIG.

When the attachment 2 is attached to the body 1, the power cable 65 is connected between the control unit 12 on the body and the power units 58 and 64 of the transmitter 51 on the attachment.
And a connector 66, and a communication cable 67 connects the COM 63 of the transmitter 51 and the COM 53 of the control device 12.
And a connection by a wired connection means comprising a connector 68.

FIG. 8 shows another example of the control device 12 and the transmitter 51 forming the attachment automatic discriminating circuit. The control device 12 on the fuselage side sends a signal to the CPU 52 to the transmitter 51 on the attachment side and the radio wave. A radio transceiver (hereinafter referred to as a transmitter / receiver 71) and a transmission / reception antenna 72 as transmission means for performing data communication with the ROM
54, the RAM 55, the driver 56 for the pump,
It is connected to the engine driver 57 and has the power unit 58.

On the other hand, the transmitter 51 is provided with the ROM 61 as a data storage device for storing unique information for each attachment.
And the CPU 62 for extracting unique information from the ROM 61.
And a radio transceiver (hereinafter referred to as a transmission means) that receives an extraction command signal from the control device 12 on the fuselage side to the CPU 62 by radio waves and transmits the unique information extracted from the ROM 61 to the CPU 62 to the control device 12 by radio waves. , A transmitter / receiver 73), a transmitting / receiving antenna 74, and a control device
And the power unit 64 that receives power supply from the twelve power units 58.

When the attachment 2 is attached to the body 1, the power unit 58 and the power unit 64 of the control unit 12 on the body side and the power unit 51 of the transmitter 51 on the attachment side are connected by the power cable 65 and the connector 66. Between the transmitter / receiver 71 of the transmitter 12 and the transmitter / receiver 73 of the transmitter 51, the transmitter 12
Information extraction command signal to 51 and transmitter 51 to controller 12
The transmission / reception of the unique information to / from the station is performed by radio waves.

FIG. 9 shows still another example of the control device 12 and the transmitter 51 forming the attachment automatic discriminating circuit. The control device 12 on the fuselage side transmits a clock signal to the CPU 52 to the transmitter 51 on the attachment side. A buffer 75 as a transmission means for transmitting a pulse signal, a buffer 76 as a transmission means for receiving the unique information transmitted from the transmitter 51, a ROM 54 storing a processing program, and a transmission from the transmitter 51 A RAM 55 for storing the obtained unique information;
A driver 56 for controlling the pump setting horsepower and a driver 57 for controlling the engine speed are connected, and a power unit 58 for supplying power to these components and each part on the transmitter 51 side, and a ground for grounding are connected. Ground 77.

On the other hand, the transmitter 51 includes a ROM 61 as a data storage device for storing unique information for each attachment,
A buffer 78 as transmission means for receiving a clock pulse signal from the control device 12 on the fuselage side, and a buffer 79 as transmission means for transmitting unique information in the ROM 61 to the control device 12
And

When the attachment 2 is attached to the body 1, each buffer of the transmitter 51 on the attachment side
78, 79 and the buffers 75, 76 of the control device 12 on the fuselage side,
A power cable 58 and a connector 66 connect a power unit 58 of the control device 12 and a power supply line 81 to the ROM 61 and buffers 78 and 79 of the transmitter 51 with a power cable 65 and a connector 66. Ground line 77 and ground line 82 of transmitter 51
Are connected by a ground cable 83 and a connector 84.

Next, the operation of the embodiment shown in FIGS. 6 to 9 will be described.

Specific information (accelerator position, pump set horsepower, increase coefficient, etc.) to be input to the control device 12 of the body 1 in order to obtain operating conditions (supply oil pressure and flow rate) necessary for appropriately operating the attachment 2 ) Is stored in the ROM 61 of the transmitter 51, and the transmitter 51 is mounted on the attachment 2 of the corresponding mounting base in advance.

As an example of the unique information in the ROM 61 of the transmitter 51, for example, the accelerator position of the engine 7 is 1600 r.p.m. p. m. , The pump setting horsepower is set such that pump torque = 60%.

In the embodiment shown in FIG. 7, when the attachment 2 is attached to the body 1, the power cable 65 and the communication cable 67 are connected, and the control device 12 of the body 1 sends the transmitter 2 of the attachment 2. When power is supplied to 51, transmitter 51 is activated.

Therefore, the control device 12 receives the data fetch instruction from the transmitter 51 through the COM 53 by executing a program process in which the CPU 52 sequentially processes the commands stored in the ROM 54.
On the other hand, on the other hand, the transmitter 51
The data read at 63 is sent to the CPU 62, and the data (unique information of the attachment 2) stored in the ROM 61 is sequentially read by the CPU 62.
It is extracted by the program processing of 62, transmitted from the COM 63 to the COM 53 of the control device 12, and stored in the RAM 55 of the control device 12 by the program processing of the CPU 52.

At this time, in the embodiment shown in FIG.
Bidirectional serial communication is performed by the communication cable 67, and transmission of a data extraction command from the control device 12 to the transmitter 51 and transmission of unique information from the transmitter 51 to the control device 12 are performed by wire.

On the other hand, in the embodiment shown in FIG. 8, the transmitter / receiver 71
Between the transmitter and the receiver 73 of the attachment-side transmitter 51, transmission of a data extraction command from the controller 12 to the transmitter 51, and transmission of the unique information extracted from the ROM 61 of the transmitter 51 to the controller 12. , By a two-way radio wave. In the case of the radio wave, it is necessary to narrow the directivity in order to prevent interference with other wireless devices.

In the embodiment shown in FIG.
Each time a clock pulse signal is transmitted from the buffer 75 of the transmitter 51 to the buffer 78 of the transmitter 51, a pair of data (specific information) is extracted from the ROM 61 in the transmitter 51 and input to the controller 12 via the buffers 79 and 76. This operation is repeated to take in all the data into the control device 12 and store it in the RAM 55.

The operation of the circuit shown in FIG. 6 is the same as that of the circuit shown in FIG. 1, and the description thereof will be omitted.

Next, FIG. 10 shows the transmitter 51 shown in FIG.
And an attachment automatic discrimination display circuit connecting the control device 12 and the display device 27. Note that the connection between the transmitter 51 and the control device 12 is the same as that shown in FIG. 7, and the connection between the control device 12 and the display device 27 is the same as that shown in FIG. The reference numerals used in these figures are attached, and the description is omitted.

Next, an automatic attachment discriminating circuit is shown in FIG.
The program on the control device 12 side in the case of those shown in FIGS. In these cases, since the data is directly input, it is not necessary to call the data from the code into the memory. Therefore, steps 17, 18, 20, 21, and 23 in FIG.
Are assigned the same step numbers (circled numbers) and description thereof is omitted.

FIG. 7 shows an automatic attachment discriminating circuit.
Since the program on the display device 27 side in the case of those shown in FIGS. 9 to 10 is the same as that shown in FIG. 5, the description is omitted.

[0095]

According to the first aspect of the present invention, the type of the work attachment attached to the machine body is displayed on the display device through the control device, so that the type of the work attachment can be automatically determined by the control device. An operator or the like looks at the display device and can confirm that the correct work attachment is mounted and that the control device automatically determines the attachment, and can operate each work attachment under appropriate conditions.

According to the second aspect of the present invention, the control device is instructed by operating the confirmation switch to confirm that the correct attachment state of the work attachment has been mounted, and the control of the control device is started. It is possible to prevent inappropriate hydraulic power source control when the wrong type is misidentified due to disconnection or the like and control is performed. For example, it is possible to prevent a problem that an inappropriate flow rate or the like is supplied to the attachment.

According to the third aspect of the present invention, when an error is displayed on the display device by the control device recognizing an unregistered code or the like, the input process is performed again by operating the reset switch. It can also handle problems such as poor contact.

[Brief description of the drawings]

FIG. 1A is a circuit diagram showing an embodiment of a control circuit in a construction machine according to the present invention, and FIG. 1B is a pump horsepower characteristic diagram showing a relationship between a discharge pressure and a discharge flow rate of the hydraulic pump. It is.

FIG. 2 is a flowchart showing a control procedure in the control device of the control circuit.

FIG. 3 is a block diagram of an attachment automatic determination display circuit formed by a connector, a control device, and a display device in the control circuit.

FIG. 4 is a flowchart showing a processing program of the control device.

FIG. 5A is a flowchart showing a processing program on the display device side, and FIG. 5B is an explanatory diagram showing a display example of the code information.

FIG. 6A is a circuit diagram showing another embodiment of the control circuit in the construction machine according to the present invention, and FIG. 6B is a pump horsepower characteristic line showing a relationship between a discharge pressure and a discharge flow rate of the hydraulic pump. FIG.

FIG. 7 is a block diagram showing an example of an automatic attachment discriminating circuit in the embodiment shown in FIG. 6;

FIG. 8 is a block diagram showing another example of the automatic attachment discriminating circuit in the embodiment shown in FIG. 6;

9 is a block diagram showing still another example of the attachment automatic discrimination circuit in the embodiment shown in FIG.

FIG. 10 is a block diagram showing an attachment automatic discrimination display circuit in the embodiment shown in FIG. 6;

11 is a flowchart showing a program on the control device side of the attachment automatic discrimination display circuit shown in FIG. 10;

FIG. 12 is a front view showing a construction machine in which a breaker is mounted on a hydraulic shovel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airframe 2 Attachment for work 5, 6 Hydraulic pump forming a hydraulic source 7 Engine forming a hydraulic source 12 Control device 27 Display device 48 Confirmation switch 49 Reset switch

Claims (3)

[Claims] 1. A construction machine in which a work attachment is exchangeably mounted on a machine body, wherein a type of the work attachment attached to the machine body is determined, and hydraulic pressure for supplying hydraulic oil to the work attachment in accordance with the type is determined. A construction machine, comprising: a control device for controlling a power source; and a display device connected to the control device and displaying a type of the work attachment determined by the control device. 2. The construction machine according to claim 1, wherein the display device has a confirmation switch on which control is started by the control device. 3. The construction machine according to claim 1, wherein the display device has a reset switch for performing an input process again when an error is displayed.