JPH0321728A - Operating device for hydraulic shovel - Google Patents

Abstract

PURPOSE:To enable some other operation system to be set on the basis of switching valves by providing and connecting a small sized sub-switching valve in series to the main switching valves, switching the main switching valves to desired positions, and further switching the sub-switching valve. CONSTITUTION:A sub-switching valve 64 for changing connections between partial input ports and output ports in relation to either of positions in which an operation system is set in main switching valves 60, 60' is connected in series to that main switching valves 60, 60'. Further, a desired number of output ports to be separately connected to partial output ports of the main switching valves 60, 60' and a desired number of output ports to be separately connected to partial control pilot valve ports are provided, and when the main switching valves 60, 60' and the sub-switching valve 64 are respectively at reference positions, the main switching valves 60, 60' are switched to desired positions and the sub-switching valve 64 is switched from the reference position to a partial connection change position. An operation system that differs from a partial operation system of the main switching valves can thus be set.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operating device that can add another operating method to an operating device that can convert between a limited number of operating methods for a hydraulic excavator.

BACKGROUND OF THE INVENTION FIG. 4 is a side view of a hydraulic excavator. In the figure,
1 is a lower traveling body, 2 is an upper rotating body, 3 is a boom, 4 is an arm, and 5 is a packet, which are a traveling motor (not shown), a swing motor 6, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder. 9. Moreover, 10 is a driver's cab provided in the upper revolving structure 2. FIG. 5 is a perspective view showing the inside of the driver's cab 10 in FIG. 4. FIG. In the figure, 11.12 is the control lever for left and right travel, 13.14 is the control lever for left and right work equipment, 15 is the driver's seat, 60 is the operation method switching valve of the prior art, 61 is the casing of the switching valve 60, 62 is a rotary spool, and 63 is a switching lever. FIG. 6 is a hydraulic circuit diagram showing a prior art operating device. In the figure, 21 and 22 are hydraulic pumps, 23 and 24 are left and right travel control valves, 25 is a boom control valve, 26 is an arm control valve, and 27
2 is a packet control valve, 28 is a swing control valve, and 20 is an oil tank. By the way, this type of hydraulic excavator is manufactured by several companies, but the operating method and especially the levers 13 for the left and right work equipment are
．． The correspondence between the operating directions A, -, H of the cylinder 14 and the cylinders 7, 8, 9 and the swing motor 6 that are operated accordingly differs depending on the manufacturer. For this reason, for example, when a driver who is accustomed to Company A's operating system operates using another company's operating system, the operator may not be able to operate smoothly due to unfamiliarity, reducing work efficiency, and there is a risk of accidents occurring due to operational errors. There is.

Incidentally, there are four typical operating methods that are currently widely used in hydraulic shovels. For this purpose, devices are used that allow a single machine to arbitrarily select several operating methods (typically four) with a simple switching operation.
Let's talk about Figures 6 to 6. The operation mode switching valve 60 includes a plurality of pilot valves 31, -, 38 which are each operated by a work machine control lever 13.14, and each direction control valve 25, which controls a plurality of hydraulic actuators 6, -, 9.
~, 28 pilot ports 25-, 25b, respectively
, 26- , 26b , 27.27b , 28. ,2
It is provided in the middle of the pilot piping connecting to 8b. Then, a rotary spool 62 is placed inside the casing 6l.
are rotatably inserted into four positions a, -, d within a predetermined angular range (eg, 45 degrees each). Input ports R1+~, Ra are provided on each of the eight surfaces formed on the surface of the gating 61 in a manner that they are sequentially shifted by a constant pitch in the axial direction and the circumferential direction, and these eight input ports Rl,~ ．． Eight output ports C in a diametrically opposed arrangement (not shown) to R8.
I, to, C8 are provided.

So, to explain input port R1 and output port C1, rotary spool 62 is in position b and d.
At the time of entry port R. and output port C1 are communicated with each other, and when in position a, input port R! and output port C1 are communicated with output port }C5 and input port R5 of other sections, respectively, and when in position C, input port R1 is communicated with output port }C6 of another section.
and the output port CI is connected to the input port R.
5.

In other words, each of the four positions a of the operation mode switching valve 60
, ~． The connection relationship between each input port R1, to R8 and each output port CI+ to +C8 in C is shown in Table 1 below.

Problems to be Solved by the Invention The operation method switching valve of the prior art has a maximum of 4 representative types.
It is configured so that you can select any operating method. However, in addition to the four methods mentioned above, there are several other operating methods that are actually used. Therefore, for example, if another position is simply added to the operation method switching valve as a means of adding other multiple operation methods to the conventional operating device, the shape of the switching valve becomes too large and the hydraulic excavator There was a problem with space occupancy when placing it in the. In addition, when manufacturing the switching valve, the shape of the internal oil passage was complicated, making it difficult to process. The object of the present invention is to provide an operating device that can add additional operating methods.

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (1) B. The operation method switching valve is set as the main switching valve, and for each position of the main switching valve, a sub A switching valve is connected in series to the main switching valve, and the opening is connected to the main switching valve. The auxiliary switching valve casing has the required number of input ports that are separately connected to some output ports of the main switching valve, and the required number of output ports that are separately connected to some of the control valve pilot ports. and c. In addition, a passage is bored in the spool of the sub-switching valve so that the connection relationship between the input port and the output port provided in the casing for the sub-switching valve can be changed. When the main switching valve is switched to a required position and the sub switching valve is further switched, another operating system can be set based on the operating system of the main switching valve.

H2) B. For any position of the main switching valve, in order to convert the connection relationship between some input ports and output ports at that position, connect the passage conversion solenoid valve to the main switching valve. Connected to the switching valve and installed. A part of the output port of the main switching valve and an input port of the solenoid valve are respectively connected separately, and a part of the pilot port of the control valve and the output port of the solenoid valve are respectively connected separately; c. When the main switching valve is switched to a desired position and the electromagnetic valve is further switched, another operating system can be set based on the operating system of the main switching valve.

Effect (1) a. When switching the auxiliary switching valve interposed between the main switching valve and some control valve pilot ports to the reference position, the connection relationship between the input port and output port provided on the auxiliary switching valve casing is , maintaining the connection relationship of the reference. Therefore, in the above case, the operation method using the main switching valve can be used as is. mouth. Next, switch the main switching valve to the required position,
Further, when the sub-switching valve is switched from the reference position to the partial connection conversion position, another operating system is set in which a part of the operating system of the main switching valve at the above-mentioned position is changed.

C. According to the above items A and B, in addition to the operation method using the main switching valve, it is possible to additionally set another operation method based on the required position of the main switching valve.

<2) A. When switching the solenoid valve installed between the main switching valve and some control valve pilot ports to the reference position, the connection relationship between the input port and output port provided on the solenoid valve casing is The connection relationship is maintained. Therefore, in the above case, the operation method using the main switching valve is used as is.

mouth. Next, switch the main switching valve to the required position,
Further, when the solenoid valve is switched, a different operating mode is set in which some of the operating modes at the above-mentioned position of the main switching valve are changed. C. According to the above items A and C, in addition to the operation method using the main switching valve, another operation method can be additionally set based on the required position of the main switching valve.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(1) FIG. 1 is a hydraulic circuit diagram showing an operating device according to claim 1 of the present invention. In the figures, the same reference numerals are given to the same components as in the prior art.

60' is a main switching valve having the same configuration as the prior art main switching valve 60, and 64 is a sub switching valve. FIG. 2 is a vertical sectional view of the main switching valve 60' and the sub switching valve 64. The main switching valve 60° and the auxiliary switching valve 64 may be configured in an integrally connected type as shown in FIG. 2, or may be configured separately. In FIG. 2, 61' is a casing of the main switching valve 60', 65 is a casing of the auxiliary switching valve 64, 66 is a rotary spool, and 67 is a switching lever. Next, the configuration of the operating device according to claim 1 of the present invention will be described with reference to FIGS. 1 and 2. For example, position a of each position a, ~, d of the main switching valve 60'
On the other hand, in order to change the connection relationship between some input ports and output ports at position a, a sub-switching valve 64 is provided connected in series to the main switching valve 6O'. Further, the main switching valve 6 is attached to the peripheral surface of the casing 65 for the sub switching valve 64.
Some output ports of 0゛ (for example) C 3 , C
4, C7, C8 separately connected to the required number of input ports }PS, P4, P7, P8, and some control valve pilot ports (for example) 27-, 27b, 28. ，
28b separately connected to the required number of output ports Q3,
Q4, Q? , Qa. Further, the rotary spool 66 of the sub-switching valve 64 has input ports P3, P4, P7, and P7 provided in the casing 65 for the sub-switching valve 64.
g and output ports Q3, Q4, Q? , A passageway was created to allow the connection relationship with Q8 to be changed. And the main switching valve 60
' is switched to the required (for example) position a, and then the sub switching valve 64 is switched, the main switching valve 6
Based on the operation method using position a of 0', another operation method can be set. Although the sub-switching valve 64 is constructed in such a manner that the rotary spool 66 is rotated, it may be of a push-pull operation. Further, the switching means of the sub-switching valve is not limited to manual operation, and may be operated electromagnetically. Further, the sub switching valve 64 can be connected in series to either the upstream side or the downstream side of the main switching valve 60'.

Next, the functions of the operating device according to the present invention will be described with reference to FIG. A sub-switching valve 64 is interposed between the main switching valve 60' and some of the control valve pilot ports 27-, 27b, 28-, and 28b.

When the sub-switching valve 64 is switched to the reference position A, the input port P provided in the casing 65 for the sub-switching valve 64
3 + P4 * P7, P8 and output port C3
, C4, C7, and C8.

Therefore, in the above case, the operation method using the main switching valve 60' is used as is. Next, when the main switching valve 60' is switched to the required position a, and the sub switching valve 64 is further switched from the reference position a to the partial connection conversion position,
Input ports Ps, P4, P7, P of the sub-switching valve 64
a is the output baud}Q? , Qs. Q3, Q4
It will be communicated to. Therefore, for example, the pilot pressure derived from the output port C3 at position a of the main switching valve 60' passes through the oil passage 68, the input port P3 of the auxiliary switching valve 64, the output port Q7, and the oil passage 69, and then flows through the pilot pressure of the control valve 28. Port 28. It becomes effective. In this way, a different operating method is set in which some of the operating methods at position a of the main switching valve 60'' are changed.In other words, in addition to the operating method using the main switching valve 60', , it is possible to additionally set another operation method based on the required position of the main switching valve 60'.

(2> Next, the operating device in claim 2 according to the present invention will be described. Fig. 3 is a hydraulic circuit diagram showing the operating device in claim 2. Elements using the same reference numerals are given. 60 is the main switching valve, 70.71 are the solenoid valves, 72.73 are the solenoids of the solenoid valves 70.71, 74 is the electric circuit, 75 is the switch, 76 is a power source.Next, the ellipses of the operating device according to the present invention will be described with reference to FIG. In order to change the connection relationship between the input port and the output port of the main switching valve 60, solenoid valves 70 and 71 were connected in series to the main switching valve 60.
For example) C1, Cs and solenoid valve 70 (7) input port P
1+P5, and some output ports C of the main switching valve 60.
2, C6 and the input ports P2, P6 of the solenoid valve 71 are connected separately, and some pilot ports (for example) 25b, 26b of the control valve and the output port Ql. Q5 and pilot port 25. ,2
6. and the output port Q2 of the solenoid valve 71. Q6 and Q6 were connected separately. Further, when the main switching valve 60 is switched to a desired position and the solenoid valves 70 and 71 are switched, another operating system can be set based on the operating system of the main switching valve 60. In addition, solenoid valve 7
0.71 may be provided on either the upstream side or the downstream side of the main switching valve 6o, and may be oval shaped in an integral connection type with respect to the main switching valve 60, or as a separate type. Good too. Next, the functions of the operating device according to the present invention will be described. When the switch 75 in the electric circuit 74 is in the OFF state, the solenoid valves 70 and 71 are in the standard positions A and 71, respectively. In this case, the output port c. of the main switching valve 60. ,C,,C. , c6, and some control valve bi-ports} 25b, 26b, 25. , 26-which respective connection relationships are maintained. Therefore, in the above case, the operation method using the main switching valve 60 is used as is. Next, the main switching valve 60 is switched to a desired position, for example, position a, and then the switch 75 is turned on. Solenoid valve 7
Since the solenoids 72 and 73 of 0.71 are both energized, the solenoid valves 70 and 71 are switched from the reference positions A and B to the connection conversion positions C and II, respectively. For example, output port C at position a of main switching valve 60. The pilot pressure derived from the oil passage 77 and the input boat P. , C position of solenoid valve 70, output port Q5
Through the oil passage 78, the pilot port 26b of the control valve 26
It comes to work on In this way, the main switching valve 60
Among the operating methods at position a, a different operating method is set with some of the operating methods changed. That is, in addition to the operation method using the main switching valve 6o,
Based on the desired position of 0, it is possible to additionally set another operation method. Effects of the Invention The operation mode switching valve installed in the conventional operating device can only be changed to four typical operation modes at most due to problems in its arrangement with respect to the hydraulic excavator and processing problems during operation. I couldn't do it.

However, in addition to the four methods mentioned above, there are several other operating methods that are actually used. In an operating device according to the present invention that addresses the above-mentioned problems,
A small auxiliary switching valve (or solenoid valve) is connected in series to the main switching valve, and when the main switching valve is switched to the required position and the sub switching valve is switched, the main switching valve operates. It is now possible to set another operation method based on the method.

Therefore, a hydraulic excavator equipped with the operating device according to the present invention can be adapted to all hydraulic excavator operation methods without enlarging the operating device.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram showing the operating device according to claim 1 of the present invention, Fig. 2 is a vertical sectional view of the main switching valve and the auxiliary switching valve, and Fig. 3 is the hydraulic circuit diagram showing the operating device according to claim 1 of the present invention. Fig. 4 is a side view of the hydraulic excavator;
The figure is a perspective view showing the inside of the operator's cab in Fig. 4, and Fig. 6 is a hydraulic circuit diagram showing the conventional operating device. 6 times motor 7 boom cylinder 8 arm cylinder 9 ゛ Kuget cylinder 13.14 = one left, right operation lever 23, -, 28-- one control valve 60. 60' 6 4 70. 71 Main switching valve Sub-switching valve Solenoid valve Patent application Jinyuutani Heavy Industries, Ltd. Kawasaki Heavy Industries, Ltd. Condolence 2 Fig. 4 Fig. h P Condolence 5 Fig. b b2 b]

Claims (2)

[Claims] (1) The required number of pilot-operated control valves that control the operation of each work equipment actuator such as the boom cylinder, arm cylinder, bucket cylinder, and swing motor in a hydraulic excavator, and the required number of pilot-operated control valves that correspond to the pilot ports of each of these control valves. In an operating device equipped with a pilot valve, a plurality of operating levers for operating these pilot valves, and one operating method switching valve that connects a pilot port of each of the control valves and each pilot valve, the above-mentioned operation is performed. The system switching valve is set as the main switching valve, and for any position of the main switching valve, sub switching is used to convert the connection relationship between some input ports and output ports at that position. A valve is connected in series to the main switching valve, and
The auxiliary switching valve casing is provided with a required number of input ports that are separately connected to some of the output ports of the main switching valve, and a required number of output ports that are separately connected to some of the pilots, and A passage is drilled in the spool of the sub-switching valve so that the connection relationship between the input port and the output port provided in the casing for the sub-switching valve can be changed, and the main switching valve is switched to the required position, and then the spool of the sub-switching valve is opened. 1. An operating device for a hydraulic excavator, characterized in that when a switching operation is performed, another operating method can be set based on the operating method using the main switching valve. (2) The required number of pilot-operated control valves that control the operation of the actuators for each work equipment in the hydraulic excavator, such as the boom cylinder, arm cylinder, bucket cylinder, and swing motor, and the required number corresponding to the pilot ports of each of these control valves. In the operating device, the operating device is equipped with a pilot valve, a plurality of operating levers for operating these pilot valves, and one operating method switching valve that connects the pilot port of each of the control valves and each pilot valve. Set the operation method switching valve as the main switching valve, and use the passage conversion solenoid valve as the main switching valve to change the connection relationship between some input ports and output ports at that position. It is connected to the switching valve, and connects some of the output ports of the main switching valve and the input port of the solenoid valve separately, and connects some of the pilot ports of the control valve and the output port of the solenoid valve, respectively. Hydraulics characterized in that they are connected separately and configured so that when the main switching valve is switched to a required position and the solenoid valve is further switched, another operating method can be set based on the operating method by the main switching valve. Excavator operating device.