JPS5830404Y2 - mobile work equipment - Google Patents

Description

[Detailed description of the invention] The present invention is a mobile work machine in which a ground work device such as a plow is connected so as to be able to rise and fall via a top link and a pair of left and right lower links. This invention relates to a technique for detecting the traction force or pressing force necessary to control the load of a device.

Conventional mobile work equipment detects the compressive force acting on the base end of the top link due to the rotational moment of the ground work device that acts during ground work, and uses this detected compressive force to generate traction force or It was configured to detect the pressing force, but in this case, when a so-called multi-connection system in which multiple ground work devices were installed in parallel in the front and back direction was adopted in order to improve the efficiency of ground work, Since the work equipment is dominated by the force in the direction of the aircraft's movement and cannot obtain the above-mentioned turning moment, the traction or compressive force will substantially increase by connecting multiple ground work equipment. On the contrary, the compressive force acting on the top link tends to decrease, which has the disadvantage that the desired traction or compressive force detection becomes inaccurate.

In view of the above-mentioned circumstances, the present invention is designed to accurately and accurately detect the traction or compressive force acting on the ground work equipment even when multiple ground work equipment is used. The purpose is to detect the traction force or compressive force acting on the pair of left and right lower links, and the width of the left and right at the rear end of the pair of lower links is changed depending on the width of the ground work device. In a mobile work machine in which the lower links are arranged opposite each other in a V-shape in plan view, when this detection means is adopted, the traction force or compressive force has a component force in the left and right directions with respect to the detection means. As a result, there is a risk that the durability of the constituent members of the detection means may be deteriorated, and there is a secondary disadvantage that disturbances that impede the detection accuracy occur during detection.

The technical problem to be solved by the present invention is to easily solve the above-mentioned disadvantages that arise when the left and right widths of the front end and the rear end of the lower link are different when adopting a detection means that uses the lower link. The aim is to make it possible to solve these problems at the same time by making structural improvements.

The technical means of the present invention taken to solve the above problem is to connect the ground work device to the machine through a top link and two lower links that are oppositely arranged in a diagonal shape when viewed from above. In this mobile work machine, one end side of a pair of arms is pivotably pivoted via a fixed support shaft attached to the machine, and the fixed support shaft on the one end side is attached to the arm. To install the P-link on the machine side, connect the base end to the lower link via the swinging fulcrum shaft, which is located at the lowest position and at different positions in the vertical direction with respect to the fixed support shaft. It is configured to convert the applied tensile force or compressive force into swinging motion of the arm, and a fixed part on the machine side at the tip end side of the pair of arms is attached with a bullet that provides resistance to the swinging motion of the arm. In addition, a detection mechanism is provided to detect the traction force or pressing force based on the amount of swing of the arm against the ammunition, and the pair of arms are connected to each other via a stay. The effects obtained by taking technical measures are as follows.

That is, the installation of the lower link pair is done by the tensile force acting on the base,
Alternatively, by configuring the structure to detect traction or pressing force using compressive force, even when multiple ground work devices are connected, the lower link pair has a tensile force commensurate with the number of connected ground work devices. Alternatively, a compressive force is acting, and the pulling or pressing force can be accurately detected by detecting the tensile or compressive force that acts sensitively on the lower link.

Moreover, the tensile or compressive force acting on the pair of lower links is converted into the swinging of the pair of arms extending from the base, and the traction or pressing force is detected based on the swinging amount of the tip of the arm. Because of this structure, it is possible to sufficiently expand the amount of conversion swing of the tensile or compressive force acting on the lower link and improve the detection accuracy of the pulling or pressing force. It is easy to obtain economical effects such as a reduction in the required mechanical strength of the detection object.

In particular, in the present invention, in order to attach multiple ground work devices to the machine according to their left and right widths, the problem of forming the lower link in a V-shape in plan view, that is, the lower link A force in the longitudinal direction and a component in the lateral direction are generated by the traction or compression force from the side, and this lateral component is
This causes distortion in the arm and causes an inconvenient twist in the bullet at the tip of the arm. By configuring the device so that component forces in the directions cancel each other out, there is an advantage that only the force in the longitudinal direction can be accurately detected.

Moreover, by connecting the arms in this way, the arms form a rigid frame structure with the fixed support shaft, the arms, and the stays, which makes it possible to increase the lateral rigidity with small members. But it is advantageous,
It has now been possible to provide a mobile working machine that can perform highly accurate detection with a simple structure and is equipped with a detection means of a durable structure.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a riding-type tiller, including a tractor (hereinafter referred to as this machine).

) At the rear of the aircraft, there is a plow 2 that cultivates the soil as the aircraft advances, one top link 3, and two lower links 4, 4 that are arranged opposite each other in the shape of a letter G in plan view. A pair of left and right lift arms 6.6 and the 4 pairs of lower links 4.6 are connected to each other so as to be able to rise and fall through a hydraulic cylinder 5, and are driven to swing vertically around the horizontal axis at the rear of the machine 1. The plow 2 is connected via a lift rod 7.7, and is configured to drive the plow 2 up and down by the telescopic operation of the hydraulic cylinder 5.

FIG. 2 shows plowing depth control of the plow 2, which is constructed as follows.

That is, a setting signal from the plowing depth dial 8 for setting the lower limit of the plow 2 and a detection signal from the detector 9 for detecting the lift arm angle are input to the first differential amplifier 10. The difference signal from the plow 2 is input to the raising and lowering comparators 11A and 11B that determine whether to raise or lower the plow 2, and the difference signal from both the comparators 11A and 11B is input to the Drive amount path 1 for raising the electromagnetic valve 12 that controls the drive of the hydraulic cylinder 5
2A and the lowering drive circuit 12B.

In addition, the reference set by the draft dial 15 and the detection traction load value of the detection device 14 that magnifies and detects the pulling force acting on the swinging fulcrum shaft (mounted at the base) 13.13 of the lower links 4, 4 pairs as the traction force. the traction load value to the second differential amplifier 16, and input the difference signal from the second differential amplifier 16 to the first differential amplifier 10;
Therefore, in a state where the detected value from the detector 9 that is fed back to the plow 2 and the detected traction load value from the detection device 14 maintain a proportional relationship, based on the detected traction load value, It is configured to automatically control the elevation.

In the figure, 18A and 18B are dead zone setting devices for ascending and descending.

The traction force detection device 14 is constructed as shown in FIGS. 3 to 7.

That is, the lower link 4 is attached to the fixed support shaft 19.19 along the left and right lateral directions, which is provided on the side of the transmission case 1A as a fixed part of the machine 1 in a similar manner.
, 4 pairs of swinging fulcrum shafts 13° 13 are fixedly attached, and 20 pairs of arms 20 and 20 extending forward along the side of the transmission case 1A are pivotally mounted to be able to swing vertically. The box-shaped spring receivers formed at both left and right ends of the spring receiver 1 members 20A, 20A fixed to the tips of the 20 pairs of arms 20 and the fixing member 21 attached to the lower part of the transmission case 1A are the box-shaped spring receivers 21A, 21A.
A spring 22 22 for elastically biasing the 20 pairs of arms downward is interposed between the 20 and 20 pairs of arms, and the middle of the 20 pairs of arms is connected via a stay 23, A swing amount detection mechanism (potentiometer) 25 provided on the plate 24 is attached to the tip end of one arm 20 of the 20 pairs of arms 20 and the fixed member 21 side.
The link mechanism 26 and the gear mechanism 27 are interlocked to convert the tensile force acting on the lower links 4 and 4 pairs into upward swinging of the arms 20 and 20 pairs. 20. It is configured to detect the traction force based on the amount of swing of the 20 pairs of tips.

The link mechanism 26 and gear mechanism 27 are constructed as follows.

That is, the spring receiver of one arm 20 pivotally connects the free end of the link 26A pivotally connected to the member 20A, and the above-mentioned attachment pivotally connects the free end of the link 26A to one end of the L-shaped link 26B pivotally connected to the plate 24. , the potentiometer 2 is mounted on the plate 24.
A fan-shaped gear 27A that meshes with and interlocks with the rotary gear 25A of No. 5 is pivotably mounted, and the fan-shaped gear 27A is attached by connecting the base end and the other end of the L-shaped socket 26B to the pin 28 and the elongated hole. 2
9, and as the tip of the arm 20 swings upward, the pushing up action of the 5'J link 26A rotates the fan-shaped gear 27A via the L-shaped link 26B. The potentiometer 25 is configured to magnify and detect the swing amount of the tip of the arm 20 as a traction force.

The present invention is applied to a mobile work machine in which a ground work device 2 such as an earth remover is connected to the front part of the machine 1 via a top link 3 and left and right lower links 4, 4 pairs so that it can be raised and lowered. It is a good thing to do.

Also, at this time, the lower links 4, 4 are attached to the base 13.
A compressive force is acting on the

[Brief explanation of the drawing]

The drawings show an embodiment of the mobile working machine according to the present invention. Fig. 1 is an overall side view of the riding type cultivator, Fig. 2 is a block diagram showing tillage depth control, and Fig. 3 is an enlarged part of the main parts. Cutaway side view, 4th
The figure is an enlarged partially cutaway plan view of the main part, Fig. 5 is an enlarged longitudinal sectional rear view of the main part, Fig. 6 is an enlarged partially cutaway rear view of the main part, and Fig. 7 is an enlarged side view of the main part. . 1... This machine, 2... Ground work equipment, 3
......Top link, 4...Lower link, 13...Rotating fulcrum shaft, 19...Fixed support shaft, 20...Arm , 22... Bomber, 23... Stay, 25... Detection mechanism, 1 person... Fixed part.

Claims (1)

[Scope of utility model registration request] Mobile work in which a ground work device 2 is connected to the machine 1 so as to be able to rise and fall via a top link 3 and two lower links 4, 4 which are arranged oppositely in a rectangular shape when viewed from above. On the machine,
The arm 2 is connected to the fixed support shaft 19.19 attached to the machine 1.
One end of the 0.20 pair is pivotally attached to the arm 20°20, and the fixed support shaft 19 on the one end side is attached to the arm 20°20.
, 19 and at different positions in the vertical direction with respect to the fixed support shaft 19.19.
．． The lower links 4, 40, which are attached to the machine side, are connected to each other via the lower links 4, 40, and their proximal ends are connected to each other, and the tensile or compressive force acting on the lower links 4, 4 is converted into a swinging motion of the arms 20°20. , this machine 1 on the tip side of the 20 pairs of arms 20°
A bullet 22 that provides resistance to the swinging motion of the arms 20, 20 is attached to the side fixed portion 1A, and the bullet 22 is attached to the side fixed portion 1A.
A detection mechanism 25 is provided for detecting the towing force or pressing force based on the amount of swing of the arm 20.
A mobile working machine characterized in that the pair of arms 20, 20 are connected to each other via a stay 23.