JPH0124203Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boom horizontal rotation restraining mechanism for a backhoe in which the boom is horizontally rotatable.

Conventionally, the swing stopper structure that restrains the left and right rotation of the support device that supports the base end of the boom of a bomb hoe has a structure in which the support that supports the base end of the boom is attached to the front end of the mount protruding from the front end of the fuselage frame so that it can rotate horizontally and horizontally. A clevis-shaped locking body is provided on each side of the support and the mounting base, and both locking bodies are connected with a connecting rod to prevent rotation of the support. However, since the support-side locking body is formed in a protruding manner on the side surface of the support, the mounting surface is small, and the structure is flat, so the strength is insufficient.

In the present invention, in order to fix the left and right tilting position of the boom support which is pivotally connected to the front of the intermediate support so as to be rotatable left and right, the rear surface of the fixing plate is provided on the front edge of the side surface of the intermediate support; By arranging the intermediate support side locking body at the inner corner where the sides of the intermediate support intersect, the installation of the locking body is made strong, and the boom horizontal rotation also serves to reinforce the fixed plate. The purpose of this invention is to provide a boom horizontal rotation restraining mechanism for a flexible backhoe.

To explain the embodiment of the present invention in detail based on the drawings, A indicates a bucket hoe, and the bucket hoe A is mounted on a rotary table 1 disposed in the center of a traveling frame b equipped with a crawler type traveling device a. A prime mover section d is arranged at the rear of a rotatably arranged fuselage frame c, and a driving section e is located at the center of the fuselage frame c.
The base end of the main boom 2 is pivotally connected to the main boom 2 so that it can move up and down via a boom support device F installed at the center of the front end of the fuselage frame C. , a sub-boom 3 and a bucket 4 are pivotally connected in the order forward from the same tip, and each boom is driven by a main cylinder 2', a sub-cylinder 3', and a bucket cylinder 4', Hydraulic pressure is supplied to each cylinder and traveling device a by a hydraulic pump in the prime mover section d, and the driving section e
It is controlled by a control valve inside.

The boom support device F has a mounting base 5 having a substantially triangular planar shape protruding forward from the center of the front end of the fuselage frame C, and a vertical pivot 6 disposed at the front end of the mounting base 5.
An intermediate support body 7 is pivotally connected via a coaxial shaft 6 so as to be horizontally rotatable. The intermediate support 7 has a substantially U-shaped side surface that opens rearward, and the front end of the mounting base 5 is vertically held between the upper and lower rear ends of the support 7. A rotating arm 8 is provided on the right side of the cylinder 7 and protrudes in the right lateral direction, and the arm 8 has a rod tip 9-1 of a horizontal rotating cylinder 9.
The head 9-2 of the cylinder 9 is pivotally connected to a fixed part c' provided on the fuselage frame c, and the expansion and contraction of the cylinder 9 causes the intermediate support to be 7 is configured to horizontally and horizontally rotate. Further, a protruding pivot shaft 10 is provided in the center of the front side of the intermediate support body 7 in a forward direction, and the boom support member 1
A main boom 2 is pivotally connected to the upper part of the boom support 11 so as to be freely movable up and down.
The head 2'' of the main cylinder 2' is pivotally connected to the lower front side of the boom support 11, and the rod tip 12-1 of the inclined cylinder 12 is pivotally connected to the lower side of the boom support 11. A trunnion 12-2 is pivotally connected to a trunnion support 8-1 disposed on the front side of the rotating arm 8, and the boom support 1 is rotated by the telescoping operation of the cylinder 12.
It is configured to perform one left and right tilt rotation. In addition, on the left side surface of the boom support 11, a fixed arm 11-1 having a substantially triangular front shape is protruded in the left lateral direction, and the tip of the fixed arm 11-1 is connected via a fixing pin 11-2. The boom support 11 is connected to a fixing plate 13 fixed to the intermediate support 7 so that the left and right inclined positions of the boom support 11 can be fixed. 7 Straight line part 13- of the same fixing plate 13 on the left side front edge 7-2
1, the front side surface of the intermediate support 7 and the front side surface 13-6 of the fixing plate 13 are fixedly installed on the same plane,
Upper, middle, and lower pin holes 13-2, 13-3, and 13 are provided at the upper, middle, and lower parts of the fixing plate 13 to insert fixing pins.
-4 is drilled.

At the inner corner where the rear surface of the fixing plate 13 and the left side surface 7-1 of the intermediate support 7 intersect, two plate-shaped locking bodies 14 of the same shape, upper and lower, each having a substantially trapezoidal shape are installed horizontally. At the front end surface 14-1 of the body 14, the rear surface 1 of the fixing plate 13
3-5, and is also fixed to the left side surface 7-1 of the intermediate support 7 at the right end surface 14-2 of the locking body 14, and a connecting hole 15 is bored in the center of the locking body 14. The front end 17-1 of the connecting rod 17 is removably locked through the connecting pin 16 inserted into the connecting hole 15, and the rear end 17-2 of the connecting rod is arranged at the front end of the fuselage frame c. By removably locking the locking base 18, the horizontal rotation of the intermediate support 7 can be stopped or released.

The embodiment of the present invention is constructed as described above, and excavation work is carried out by operating the horizontal rotation cylinder 9 and the tilt cylinder 12 to set the rotation plane of the main boom 2, cylinder 2',
This is done by operating 3' and 4', but the backhoe A
When fixing the intermediate support 7 for movement, maintenance, etc., the locking body 14 of the intermediate support 7 and the locking base 18 of the fuselage frame c are connected with the connecting rod 17, and the intermediate support 7 is fixed to the fuselage frame. It can be fixed at c. The front and rear ends 17-1, 17-2 of the connecting rod 17 are connected by a connecting pin 16 and a stud 18', so that they can be easily connected and removed.

Note that by connecting the fixed arm 11-1 of the boom support 7 to the fixed plate 13 of the intermediate support 7 via the fixing pin 11-2, the boom support 11
The left and right tilt position can be fixed in three positions: left, upright, and right.

According to the present invention, by arranging a horizontal plate-shaped locking body at the inner corner where the rear surface of the fixed plate and the side surface of the intermediate support intersect, three planes that are orthogonal to each other are fixed to each other. An extremely strong locking body mounting structure can be achieved, which has the effect of preventing and reinforcing the fixing plate from falling sideways.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the backhoe, Fig. 2 is a plan view of the main part, and Fig. 3 is a rear view of the main part. A: Backhoe, 7: Intermediate support, 7-1: Left side of intermediate support, 13: Fixed plate, 13-5: Rear surface of fixed plate, 14: Locking body, 14-1: Front end surface of locking body, 14 -2: Locking body right end surface, 15: Connection hole,
17: Connecting rod, 18: Locking stand.

Claims (1)

[Scope of utility model registration request] A mounting base 5 is provided at the center of the front end of the fuselage frame c and protrudes forward, and a vertical pivot 6 is provided at the front end of the mounting base 5, and the mounting base 5 is horizontally rotatable about the vertical pivot 6. An intermediate support 7 is pivotally connected to the intermediate support 7, and a horizontal rotation cylinder 9 is connected between the intermediate support 7 and the fuselage frame c in order to horizontally rotate the intermediate support 7.
A boom support is disposed in between, and a protruding pivot shaft 10 is disposed in the center of the front side of the intermediate support body 7 and projects forwardly, and a boom support member is provided in front of the intermediate support body 7 to be rotatable to the left and right about the protruding pivot shaft 10. 11 is pivotally connected to the boom support 1.
The same boom support 1 is installed in order to allow the boom support 1 to tilt and rotate left and right.
1 and the intermediate support 7 is a tilting rotation cylinder 12
Further, in order to fix the left and right inclined position of the boom support 11, the rear surface 13-5 of the fixing plate provided on the front edge 7-2 of the side surface of the intermediate support 7 and the side surface 7-1 of the intermediate support 7 are provided. A support 7-side locking body 14 for restraining the horizontal rotation of the intermediate support 7 is arranged at the intersecting inner corner, and a boom horizontal rotation prevention is provided between the fuselage frame c and the intermediate support 7. A boom horizontal rotation restraining mechanism in a backhoe capable of horizontally rotating the boom, which is configured such that a connecting rod 17 for the boom can be detachably interposed therein.