JPH0564251U - Operation lever operation pattern change mechanism - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The operation pattern can be easily changed between different types of hydraulic equipment to prevent erroneous operation. [Structure] A pilot valve 11 is rotatably supported by a support case of an operation lever, communicated with a hydraulic hose 25 having a rotary joint 24 between the pilot valve and a main valve, and an operation protruding from the pilot valve The operation levers 7L and 7R are fixed to the rod 15 so that the rotational position can be changed, and the fixed plate fixed on the pilot valve can be changed by 90 degrees about the operation rod with respect to the support case. Is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a configuration for easily changing an operation pattern of a hydraulic operation lever for excavating or turning a construction machine or the like.

[0002]

[Prior Art]

 Conventionally, operations such as rotating and swinging buckets and booms such as backhoes and swings have been performed by rotating operation levers provided in the driver's seat. The operating lever is connected to the switching valve, and when the operating lever is operated, the switching valve is switched. The connecting structure is a link method in which a link is provided between the base of the operating lever and the switching valve, or the operating lever base. There is a pilot valve system in which a pilot valve is installed in the main valve and pressure oil is sent from the pilot valve to the main valve to switch the main valve. Also, the operation patterns for operations such as excavation and swing differ depending on the manufacturer.When changing the model at the time of replacement, etc., make sure to match the operation pattern of the machine with the conventional operation pattern to make a mistake. I was trying to prevent. In other words, the technology that allows the operation pattern to be changed for hydraulic equipment of different manufacturers has become known.

[0003]

[Problems to be solved by the device]

 However, in the conventional method of changing the operation pattern, if the link between the operation lever and the switching valve is a link type, it is necessary to change the link, and if it is the pilot method, it is necessary to change the piping. In this replacement work, the switching valve is installed in the operation column and in the engine compartment, so the space around the switching valve is small and it is very troublesome to work in a narrow box with the cover removed. It took a lot of time, and it was difficult to tell which pattern was used once the link or piping was removed, and it was easy for replacement mistakes to occur.

[0004]

[Means for Solving the Problems] In order to solve such a problem, the present invention provides a pilot case in a support case fixed to an operation column in an operation mechanism of a hydraulic working machine in which an operation lever is projected above the operation column. The valve is rotatably supported, the pilot valve and the main valve are connected by a hydraulic hose equipped with a rotary joint, and the operation lever is fixed to the operation rod protruding from the pilot valve so that the rotation position can be changed. The fixing plate fixed on the pilot valve is configured so that it can be rotated by 90 degrees about the operation rod with respect to the support case, and a locking portion that locks the fixing plate at the rotating position is provided. It is provided.

[0005]

【Example】

 The problems to be solved by the present invention and the means for solving the problems are as described above, and the configuration of the embodiment of the backhoe shown in the accompanying drawings will be described. 1 is a plan view of a backhoe, FIG. 2 is a front sectional view of an operating column, FIG. 3 is a front sectional view of a pilot valve portion, FIG. 4 is an enlarged view of a supporting plate fixing portion, FIG. 5 is a plan view of an operating lever, and FIG. It is a top view of the state where the pattern was changed. The backhoe mounts the swivel on the crawler type traveling device 1, arranges the machine frame 2 on the swivel, arranges the engine compartment 3 on the rear part of the machine frame 2, and seats 4 thereon. A boom supporting base 6 is provided on the front end of the machine body frame 2 so as to project a boom (not shown), and an operation column 5 is erected on the rear portion of the boom supporting base 6. The operation lever 7 and the steering lever of the present invention are erected on the operation column 5, and the switching valve is internally provided in the operation column 5.

That is, as shown in FIGS. 2 and 3, the switching valve comprises a pilot valve 11 and a main valve 26, a valve mounting case 10 is fixedly mounted on the upper surface of the operation column 5, and the pilot valve is mounted on the valve mounting case 10. A support case 12 of 11 is fixed, and a pilot valve 11 is rotatably supported by the support case 12 via a bearing 13. A fixed plate 14 is fixed to the upper surface of the pilot valve 11, and fixed bolts 16 are arranged at arbitrary positions on the fixed plate 14 as shown in FIGS. 4 and 5. The fixing bolt 16 has a rounded tip so that it can easily enter a bolt hole described later, and it does not damage the support case 12 when rotating, and the screw part penetrates the stay 20 fixed to the fixing plate 14. A spring 21 is fitted on the lower side of the stay 20 and locked by a retaining ring 22 so that the fixing bolt 16 is urged downward, and a lock nut 23 is screwed on the screw portion on the upper side of the stay 20. ing. A bolt hole 12a is formed in the support case 12 below the fixing bolt 16, and a bolt hole 12b is also formed in a position in which the fixing plate 14 is rotated 90 degrees about the operation rod 15. The fixing bolt 16 can be screwed into any bolt hole.

An operating rod 15 is projected in the center of the pilot valve 11, a base of an operating lever 7 is rotatably fitted on an upper end of the operating rod 15, and can be fixed to the operating rod 15 by a bolt 17. When the operating lever 7 is tilted, the operating rod 15 is also tilted so that the spools provided at the front, rear, left and right of the pilot valve 11 are pushed. The lower end of the pilot valve 11 is communicated with the hydraulic hoses 25, 25 ... Through rotary joints 24, 24 ... And the lower ends of the hydraulic hoses 25, 25 ... Are communicated with the main valve 26. .. 27 is a pedal for turning.

In such a configuration, for example, when changing the operation pattern from FIG. 5 to FIG. 6, the lock nut 23 is loosened, the fixing bolt 16 is removed from the bolt hole 12a and pulled up, and the fixing plate 14 is moved to 90 °. When the fixing bolt 16 is rotated once, the fixing bolt 16 can be rotated and inserted to the position of the bolt hole 12b. It is easy if the fixing bolt 16 is screwed into the bolt hole 12b and fixed with the lock nut 23. It can be done without fail. At this time, if the hydraulic hoses 25, 25 ... And the pilot valve 11 are fixed, the hose will be twisted and the hose will be squeezed and hinder the oil supply of the working oil, but since it is connected via the rotary joint 24. As the fixed plate 14 rotates, the fixed plate 14 rotates and is bent without applying an excessive load. Then, if the bolt 17 at the base of the operating lever 7 is loosened and the operating lever 7 is rotated 90 degrees in the opposite direction and fixed again, the original operating position is restored. Therefore, for example, if the operation pattern before the change is the forward / backward movement of the operation lever 7 is the boom raising / lowering operation and the left / right rotation is the forward / backward operation of the bucket, the changed operation pattern after rotating the fixed plate 14 is The forward / backward rotation of the operating lever 7 becomes the forward / backward operation of the bucket, and the rightward / leftward rotation changes the operation pattern to the raising / lowering operation of the boom.

[0009]

[Effect of the device]

 The present invention has the following effects with the above configuration. In other words, the operation pattern can be changed by rotating the fixed plate fixed to the pilot valve 90 degrees and rotating the operation lever 90 degrees in the opposite direction, so it is not necessary to remove the cover or replace it in a narrow cover. Since the pattern can be changed easily and quickly, and the structure for changing is simple, the cost can be reduced. Further, since the rotary joint is interposed between the hydraulic hose and the valve, the hydraulic hose is not twisted and there is no trouble in oil feeding.

Further, even after the operation pattern is changed, the operation pattern displayed on the fixed plate remains as it is, and the position of the fixing bolt on the fixed plate also changes when the operation pattern is changed. This made it possible to see at a glance how the operation was mistaken, and since there was no need to replace the link or hydraulic hose, there was no chance of any erroneous operation.

[Brief description of drawings]

FIG. 1 is a backhoe plan view.

FIG. 2 is a front sectional view of an operation column.

FIG. 3 is a front sectional view of a pilot valve portion.

FIG. 4 is an enlarged view of a support plate fixing portion.

FIG. 5 is a plan view of an operation lever.

FIG. 6 is a plan view showing a state in which the operation pattern has been changed.

[Explanation of symbols]

 5 Operation Column 7 Operation Lever 12 Support Case 11 Pilot Valve 14 Fixed Plate 15 Operation Rod 24 Rotating Joint 25 Hydraulic Hose 26 Main Valve

Claims (1)

[Scope of utility model registration request] 1. In an operating mechanism of a hydraulic working machine having an operating lever protruding above an operating column, a pilot valve is rotatably supported by a support case fixed to the operating column, and the pilot valve and the main valve are connected to a rotary joint. The operating lever is connected to the operating rod that protrudes from the pilot valve so that the rotating position can be changed, and the fixed plate fixed on the pilot valve is centered on the operating case with respect to the support case. An operation pattern changing mechanism for an operation lever, which is configured to be capable of changing a 90-degree rotation position, and is provided with a locking portion capable of locking the fixed plate at the rotation position.