JPH0423799A - Boom type loading vehicle - Google Patents

Abstract

PURPOSE:To vertically hold a post, increase the moving range of the post, and improve the efficiency by controlling the oil pressure to the balancing cylinder of a lift post in relation to the expansion and contraction of a boom derricking cylinder. CONSTITUTION:A boom 12 is changed in derricking angle by the expansion and contraction of a boom derricking cylinder 14, and the boom length is changed by the expansion and contraction of the boom 12. A fork lift post 19 rotatably mounted on the top of the boom 12 is changed in inclination of the post 19 by the expansion and contraction of a balancing cylinder 21. The expansion and contraction of the balancing cylinder 21 is controlled by oil pressure according to the expansion and contraction of the cylinder 14 so as to vertically hold the post at an optional derricking angle of the boom 12. Thus, the post 19 can be moved while keeping the vertical state in vertical and longitudinal directions, and the moving range is increased, resulting in an improvement in efficiency.

Description

[Detailed description of the invention]

[Industrial Application Field] This invention is a boom that can further widen the work range by raising and lowering the boom, the amount of extension and contraction of the boom, and the raising and lowering of the fork part, and is suitable for unloading work at offset position 7 for both indoors and outdoors. Regarding type unloading vehicles. [Conventional technology] The conventional unloading vehicle is a forklift, but it can only lift cargo directly overhead.・Also, when lifting with a crane, from the tip of the boom to the crane block and cargo. There is quite a bit of teddy saw, but it is not suitable.

[The invention has solved and attempted to solve the problem] Conventionally, work to attach cargo, especially indoors, has been carried out using a forklift or a crane. Each had the above drawbacks. This invention aims to eliminate this drawback and improve the efficiency of one task. [Means for Solving the Problems] Here, the present invention includes a movable truck, and a base end rotatably coupled to the truck. an extendable boom; an arm fixed to the tip of the arm; a forklift post rotatably connected to the arm; a boom hoisting cylinder that is rotatably coupled and extends and contracts to control the hoisting angle of the boom; and a boom hoisting cylinder that is rotatably coupled to the arm and the forklift post at both ends and expands and contracts to control the tilting angle of the forklift post. and a hydraulic device that controls hydraulic pressure to the balance cylinder in relation to the undulation angle of the boom and holds the forklift post vertically. In order to propose and implement the same, the hydraulic system communicates the rond side of the boom hoisting cylinder with the head side of the balance cylinder, and the boom hoist cylinder side link and the balance cylinder side link are connected to each other. The ratio of is equal to the ratio of the cross-sectional area of the head-side oil chamber of the balance cylinder to the rod-side oil chamber cross-sectional area of the boom luffing cylinder, and
, or the hydraulic device includes a pressure checker that detects the tilting angle of the forklift post, and a control valve that controls the amount of expansion and contraction of the balance cylinder by hydraulic control of the balance cylinder based on the output of the detector. It is. [Operation] Along with the expansion and contraction of the arm undulation cylinder. The boom rotates around a pivot point at its base end, changing the angle of elevation of the arm. The hydraulic system is related to the expansion and contraction of the boom luffing cylinder and controls the hydraulic pressure to the balance cylinder. As a result, the tilt angle of the forklift post changes, so that the forklift post is held vertically. [Embodiments] The present invention will be described below with reference to the illustrated embodiments. 1 and 2 show a side view and a plan view of a boom-type culture vehicle.
It is fixedly installed and protrudes upward. The boom 12 is extendable and retractable by an internal telescopic cylinder, and is rotatably coupled to the upper end of the bracket IT via a shaft 13 at its base end. The boom hoisting cylinder 14 is connected to a shaft 17. by a bracket 15.16 which is fixed to the truck 10 and the boom 12, respectively. ] l'l, and extends and contracts to control the luffing angle of the boom 12. Forklift 2 is attached to the front of post 19 for forklift 1 to
0 is fixed. The balance cylinders 2] are disposed on both sides of the forklift 1-post 19 in the width direction, and are fixed to the top end of the bracket 24 and the tip end of the boom 12 via shafts 22+23 at both ends. a balance cylinder 21 pivotally coupled to an arm 26 having a depending portion 25;
The position of the shaft 23 as the pivot point of the lower end of the arm 26 is sufficiently separated from the shaft 27 as the pivot point of the lower end of the arm 26. Since these shafts 27123 are not attached to the boom 2 itself, the boom 12 does not need to have a structure to ensure great strength (the boom 12 can be made smaller in diameter and lighter in weight). Fig. 3 shows the range of movement of the forklift post 19. The extension and contraction of the boom luffing cylinder 14 changes the elevation angle of the boom 12, and the extension and contraction of the cylinder within the boom 12 changes the length of the boom 12. The tilting angles of the forklift bosses 1 to 19 change as the balance cylinder 21 expands and contracts.The balance cylinder 21 expands and contracts so that the forklift post 19 is held vertically at any undulation angle of the boom 12. .In this way, the forklift post 19 can be moved vertically and in the longitudinal direction of the truck 10, and the range of movement of the forklift post 19 for one work is greatly increased.Furthermore, since the boom 12 can be made lighter, the forklift Even when the forklift post 19 is horizontally far away from the truck IO. Sufficient stability is obtained, and the forklift post 19
can be moved far in the horizontal direction with respect to one cart IO. Furthermore, when the forklift post 19 is stored, it is placed directly above the truck 10, and the outer diameters of the truck IO and the forklift post 19 are approximately equal in the plane direction, making the whole compact. This allows for easy transport even when the unloading vehicle is loaded onto a working elevator and transported upstairs. FIG. 4 shows a hydraulic circuit diagram of the present invention, in which a hydraulic pressure source is connected to a boom raising/lowering valve section 29, a boom extension/retraction valve section 30, and a control valve 28 via a pump 27. Four Crits 2
0 through the lift valve part 31 and the adjustment valve part 32, and the boom luffing sill 14. Hiroseki cylinder 21. Telescopic cylinder for boom 12. Hydraulic pressure for operation is supplied to the lift cylinder 33 of the forklift 20, and a safety valve 34 is provided in each circuit. Note that 35 indicates a pressure regulating valve. In the hydraulic system having the circuit configured as described above, the rod side of the boom hoisting cylinder 14 and the head side of the balance cylinder 21 are communicated with each other, and the boom hoisting cylinder side]4 link is connected to the balance cylinder side 2I. The ratio to the link is set equal to the ratio of the cross-sectional area of the head side oil chamber of the balance cylinder side 21 to the cross-sectional area of the side oil chamber of the boom luffing cylinder 14. A detector for inspecting the tilt angle and a control valve for controlling the amount of expansion and contraction of the balance cylinder 21 by hydraulic control of the balance cylinder 21 based on the eight forces of this detector are provided. [Effects of the Invention J As mentioned above. According to the invention, the hydraulic system controls the hydraulic pressure to the balance cylinder of the forklift post in relation to the expansion and contraction of the boom hoisting cylinder, and as a result, the tilting angle of the forklift post changes. , loading capacity can be increased. In addition, the fork + 1 foot post can be held vertically at any desired boom extension/retraction angle and up/down angle, increasing the range of movement of the forklift post and increasing work efficiency.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention. Fig. 1 is a side view of a boom-type unloading vehicle, Fig. 2 is a plan view thereof, Fig. 3 is a diagram showing the movement range of a forklift post, and Fig. 4 is a diagram showing a boom-type unloading vehicle. FIG. 2 is a hydraulic circuit diagram for vertically holding a forklift post according to the undulation angle of the forklift post. In addition, in the figure. 10 Dolly 12 Boom 14 Boom luffing cylinder 19 Forklift post 21 Balance cylinder Figure 21: Balance cylinder

Claims (3)

[Claims] (1) A movable truck 10, a boom 12 rotatably connected to the truck 10 at its base end and extendable and retractable, an arm fixed to the tip of the boom 12, and a rotatable boom 12 attached to the arm. a forklift post 19 that is movably coupled to the forklift post 19; a boom hoisting cylinder 14 that is rotatably coupled to the truck 10 and the boom 12 at both ends and expands and contracts to control the hoisting angle of the boom 12; a balance cylinder 21 that is rotatably coupled to the arm and the forklift post 19 and expands and contracts to control the tilting angle of the forklift post 19; and controlling the hydraulic pressure to the forklift post 19.
A boom-type unloading vehicle characterized by having a hydraulic device that vertically holds the boom. (2) The hydraulic system includes the boom luffing cylinder 14
The rod side of the balance cylinder 21 is communicated with the head side of the balance cylinder 21, and the ratio of the 14 links on the boom luffing cylinder side to the 21 links on the balance cylinder side is the same as that of the balance cylinder 21.
The cross-sectional area of the head side oil chamber and the boom luffing cylinder 14
2. The boom type unloading vehicle according to claim 1, wherein the ratio is equal to the cross-sectional area of the rod side oil chamber. (3) The hydraulic system includes the forklift post 1
9. The control valve includes a detector for detecting the tilt angle of the balance cylinder 21, and a control valve for controlling the amount of expansion and contraction of the balance cylinder 21 by hydraulic control of the balance cylinder 21 based on the output of the detector. The boom type unloading vehicle described in 2.