JPH0452289Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an improvement in a device for angling a blade by moving a brace back and forth using a cylinder.

[Conventional technology]

In conventional angle dozers, the base end of the brace that holds the blade is moved along and connected to the support frame (C frame) by attaching and detaching pins.
Angling the blade. However, this system cannot be operated from the driver's seat, lacks maneuverability, and is inefficient. Furthermore, when attaching the brace to the support arm with a trunnion with the cylinder facing forward, interference with the tilt cylinder occurs, so it is necessary to modify the support frame. In addition, as in the angle dozer device of Utility Model Application Publication No. 55-88471, a sliding member that can be locked at any position on the support frame is provided at the base end of the brace, and an angle cylinder connected to the blade in front of the support frame is used. A configuration in which the blade is tilted is also known, but since a cylinder is provided near the rotational fulcrum of the blade, there is a drawback that the speed when angled is slow. Therefore, there is a configuration in which a cylinder is used to move the brace forward and backward along the support frame, but this requires a cylinder with a long stroke and large diameter or a telescope type cylinder, which complicates the structure and poses a risk of damage. As the length to the blade became longer, it was necessary to modify the support frame.

[Problem that the invention attempts to solve]

This idea was devised as a result of intensive research in view of the above circumstances, and its main challenges are to shorten the shortest length to the blade while using a hydraulic cylinder, and to ensure speed when angled. To provide a highly reliable blade angle device.

[Means to solve the problem]

In order to solve the above problems, this invention provides a support frame at the front of the self-propelled body, a blade that can rotate in the left and right directions at the front of the support frame, and a blade that is pivoted on both sides of the blade. A blade angle device in which the base ends of a pair of braces are movably supported on the support frame and fixed at an arbitrary position, the blade angle device comprising: (a) providing guide portions in the front-rear direction at extending portions on both sides of the support frame; (b) providing a running connection body that runs in a fixed direction along the guide portion and having a proximal end of the brace pivotally connected; (c) connecting one end of the first cylinder to the running connection body; (d) ) fixed opposite to a part of the first cylinder;
A technical measure is taken in which second cylinders are provided, each of which is telescopic, and one end of the second cylinder is connected to the support frame.

[Effect]

The traveling coupling body is moved along the guide rail on the support frame by expansion and contraction of the first cylinder and the second cylinder. Since a brace supporting the blade is connected to this running link, the brace moves forward and backward in accordance with the movement of the running link to transmit a rotational force to the blade. By moving the brace on the opposite side in the opposite direction in conjunction with the movement, the brace can be freely angled.

【Example】

A preferred embodiment of an angle dozer using the blade angle device according to the invention will be described below with reference to the drawings. The angle dozer shown in FIGS. 1 to 3 has a support frame (C frame) 2 whose base end is pivotally connected to the vehicle body of the dozer 10 and which can be raised and lowered by a lift cylinder (not shown) at the front thereof. It consists of a publicly known configuration. A blade 8 is pivotally attached to the front part of the support frame 2 so as to be rotatable in the left and right (horizontal) directions. A pair of braces 7A, 7 are provided on both sides of the blade.
The distal end of B is pivotally attached, and the proximal end thereof is held so as to be slidable back and forth along the support frame 2. Here, the blade angle device 1 of this invention
These include a pair of left and right guide rails 3, 3 provided on the support frame 2, traveling coupling bodies 4, 4 that slide on each guide rail 3, a second cylinder 5A whose one end is pivotally connected to the support frame 2, 6A, and first cylinders 5B, 6B fixed to the second cylinders 5A, 6A and having one end pivotally connected to the traveling coupling body 4.
It is made up of. That is, the support frame 2 has a substantially U-shape lying sideways, and guide rails 3, 3 are protruded from the extending portions 2', 2' on both sides thereof. In this embodiment, the guide rail 3 is the second
As can be seen more clearly in the figure, it has a T-shaped cross section projecting from the upper surface of the extending portion 2'. The guide portion of the present invention shown in the guide rail 3 may be a rail or a guide groove, and the traveling coupling body 4 having a corresponding guide receiving structure can be slid in the front and rear direction. It may have any shape or configuration as long as it can move forward and backward along a constant trajectory. Further, a sliding means such as a roller may be interposed between the traveling coupling body 4 and the guide portion. The traveling coupling body 4 that fits onto each of the guide rails 3, 3 includes a sliding base part 40 formed with a guide groove that slides on the guide rail 3, and a first cylinder integrally formed above the sliding base part 40 and a first cylinder in the center. It consists of a connecting part 41 into which the telescopic rods 5B and 6B are fitted and pivotally connected, and the base end of the brace 7 is pivotally connected to the outer side surface of the connecting part 41. The telescopic rods of the second cylinders 5A and 6A are pivotally connected to a bracket 21 that projects from the extending end side of the extending portion 2' of the support frame 2. The cylindrical portions of the second cylinders 5A, 6A include a first cylinder 5B, which is oriented in the opposite direction.
The cylindrical portion 6B is integrally fixed with a fixing member K such as a bolt. The first cylinders 5B and 6B are pivoted by pins, with the tips of their telescopic rods being fitted into the connecting portions 41 of the traveling connector. As a result, the expansion and contraction of the second cylinders 5A, 6A moves the cylindrical portions of the first cylinders 5B, 6B forward and backward, so that the traveling coupling body 4 is moved along the guide rail 3 by the first cylinders 5B, 6B and the second cylinders 5A, 6A.
You can slide it back and forth along the
At this time, the extension strokes of the respective cylinders do not interfere with or reduce each other, and the extension strokes of the respective cylinders can be jointly advanced with the total extension stroke. Although the shape and configuration of the brace 7 that is pivotally connected to this running connector 4 does not matter, in this embodiment, the base end of the lower brace 7A is pivotally connected, and the lower brace 7
The upper brace 7B is pivotally attached to a bracket protruding from the proximal end of the bracket A, and is formed in a substantially horizontally V-shape. Next, the first cylinders 5B, 6B and the second cylinders 5A, 6A are supplied with pressure oil from a hydraulic system installed in the vehicle body, and an example of the hydraulic circuit is shown in FIG. 4. Pressure oil discharged from the pump P is sent to the switching valve 9. This switching valve 9 is composed of a 4-boat 3-position switching valve, and when it is switched from the central closed center position to the position A in the figure with the operating lever 9A, pressure oil flows into the bottom interior of the first cylinder 5B on one side. It is supplied to the inside of the bottom of the second cylinder 5A, and simultaneously to the inside of the head of the other first cylinder 6B and the inside of the head of the second cylinder 6A. Therefore, the first and second cylinders 5A, 5 on one side
B moves in the expansion direction, and in synchronization with this, the first and second cylinders 6A and 6B on the other side move in the contraction direction. Next, when the switching valve 9 is switched to the position B in the figure, pressure oil is supplied to the inside of the heads of the first cylinder 5B and the second cylinder 5A on one side, and at the same time, the pressure oil is supplied to the inside of the head of the first cylinder 5B and the second cylinder 5A on the other side. The first and second cylinders 5A and 6A on one side move in the contraction direction, and at the same time, the first and second cylinders 5B and 6B on the other side move in the extension direction. In this way, the movements of the cylinders on the opposite side are linked in the opposite direction, so slide the traveling coupling body 4 on the guide rail 3 and position the base end of the brace 7 at the position b shown in FIG. 1 as the center. It is possible to freely move the left and right braces in opposite directions within the range from c to c. Correspondingly, the blade 8 can be angled from position A to position C in Figures 1 and 3, and the switching valve 9 can be switched to the central closed center position to block the oil passage and proceed with the work. can do.

[Effect of the idea]

In this invention, a plurality of small cylinders are combined to move the traveling link body forward and backward, so the blade can be angled with a long stroke without reducing speed. Moreover, since it is a small cylinder, it is easy to handle and install, and is excellent in convenience. And because the minimum length from the cylinder to the blade is shorter than a single cylinder using a long telescoping rod, a conventional pin-type support frame can be used, and existing equipment can be easily modified. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of a blade angle device according to an embodiment of this invention, FIG. 2 is a cross-sectional view of the main parts showing a state in which the guide rail and the traveling coupling body are attached, and FIG. 3 is a side view showing the main parts of the blade angle device according to an embodiment of the invention. A plan view showing one side of the device, and FIG. 4 is a hydraulic circuit diagram for operating the first and second cylinders. DESCRIPTION OF SYMBOLS 1... Blade angle device, 2... Support frame, 3... Guide rail, 4... Traveling connection body,
21... Bracket, 5A... One second cylinder, 6A... Other second cylinder, 5B... One first cylinder, 6B... Other first cylinder,
7...Brace, 8...Blade, 9...Switching valve.

Claims (1)

[Claims for Utility Model Registration] (1) A support frame is provided at the front of the self-propelled body, a blade rotatable in left and right directions is provided at the front of the support frame, and the blade is pivotally mounted on both sides of the blade. A blade angle device in which the base ends of a pair of braces are movably supported on the support frame and fixed at any position, the blade angle device includes a guide portion provided along the front-rear direction at an extending portion on both sides of the support frame; , a running coupling body that runs along the guide portion and connects the proximal ends of the blades; a first cylinder that has one end connected to the running coupling body; and an opposite cylinder that is fixed to a part of the first cylinder. It consists of a second cylinder that expands and contracts in the direction and one end of which is connected to the support frame, and by the expansion and contraction of the first and second cylinders, the traveling link body is moved and the brace 7 is moved forward and backward to angle the blade. A blade angle device characterized by: (2) The blade angle device according to claim 1, wherein the guide portion is comprised of a linear rail protruding from the support frame. (3) A hydraulic circuit is provided in which the expansion and contraction of one first cylinder and second cylinder provided on both sides and the expansion and contraction of the other first cylinder and second cylinder operate in opposite directions in synchronization. A blade angle device according to claim 1, characterized in that: