KR-102950108-B1 - Fall prevention device for loading box of agricultural power transport vehicle and control method thereof

KR102950108B1KR 102950108 B1KR102950108 B1KR 102950108B1KR-102950108-B1

Abstract

The present invention relates to a device and a control method for preventing a cargo box of a power carrier from falling due to a failure of a hydraulic cylinder or the like while in a raised state. The device comprises a latch bar that operates to move up and down by a hydraulic cylinder, and a latch pawl that performs a locking action by being inserted into or removed from a locking groove of the latch bar. When the latch bar rises, the latch pawl repeatedly moves out of and into the locking groove. When the latch bar descends, the latch pawl engages with the locking groove to prevent further descent. When the cargo box stops rising, the locking device operates to completely prevent further descent, and the locking device is released only when the cargo box is lowered. The invention relates to a fall prevention device and a control method thereof.

Inventors

장재환

Assignees

주식회사 스마트한농

Dates

Publication Date: 20260507
Application Date: 20250909

Claims (3)

In an agricultural transport vehicle, the vehicle body (1) has wheels (2) in the form of tracks or tires mounted on both lower sides and is driven by power from an engine or motor, and a scissor link arm (4) connected in an 'X' shape between the bottom surface of the cargo box (3) and the vehicle body (1) is installed to lift the cargo box (3), and then the cargo box (3) is raised by simultaneously pushing up both scissor link arms (4) on one side using a hydraulic cylinder (5). A latch bar (10) fixed to a crossbar (6) that is operated by a hydraulic cylinder (5) and has a repeating configuration of a locking projection and a locking groove having an inclined surface and a locking surface; It is composed of a latch pawl (30) that has elasticity toward the locking portion by means of a latch spring while being inserted into or removed from the locking groove of the above latch bar. When the latch bar rises, the latch pawl repeatedly moves in and out of the locking groove, and when the latch bar descends, the latch pawl engages with the locking groove to prevent further descent. A cargo box fall prevention device for an agricultural power transport vehicle, comprising a reverse device (40) for overcoming the elasticity of a latch spring (31) and forcibly separating the latch pawl (30) from the locking groove (12'), wherein the reverse device comprises a reverse motor (42), a pusher (44) having an elongated hole that is operated by the reverse motor (42), and a reverse operating member having an operating pin that is fixed to a support rod (20) together with the latch pawl and inserted into the elongated hole.
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In controlling a fall prevention device for an agricultural transport vehicle, the device comprises: a latch bar (10) fixed to a crossbar (6) that operates to be raised and lowered by a hydraulic cylinder (5) and having a repeating configuration of a locking projection and a locking groove having an inclined surface and a locking surface; and a latch pawl (30) that has elasticity toward the locking portion by a latch spring while being inserted into or removed from the locking groove of the latch bar, wherein when the latch bar rises, the latch pawl repeats the motion of being pushed out and inserted into the locking groove, and when the latch bar descends, the latch pawl is caught in the locking groove to prevent descent. When the driver stops the operation of raising the cargo box (3) and sends a stop signal by touching a button, the hydraulic pressure state of the hydraulic cylinder (5) is released so that the hydraulic cylinder (5) is lowered by the gravity of the cargo box, and as a result of this lowering, the latch bar (10) is lowered and the locking groove (12') is lowered, and when the tip of the latch pawl (30) is positioned in the locking groove (12'), the latch pawl is inserted into the locking groove (12') by the force of the latch spring (31). A method for controlling a cargo box fall prevention device of an agricultural power transport vehicle, characterized in that when the driver performs an operation to lower the cargo box (3) while the upward movement is stopped, the hydraulic cylinder (5) is first controlled to raise the cargo box (3) by a certain distance, and then when the reverse motor (42) acts to tilt the operating arm (43), the pusher (44) moves in the opposite direction of the latch bar (10) by the operating arm (43), and accordingly, the operating pin (47) of the reverse operating member (46) inserted into the elongated hole (45) is pushed out, and the support rod (20) rotates by a certain distance so that the latch pawl (30) is completely disengaged from the locking groove (12'), the latch bar (10) is controlled to be lowered by the reverse action of the hydraulic cylinder (5).

Description

Fall prevention device for loading box of agricultural power transport vehicle and control method thereof The present invention relates to a device and a control method for preventing a cargo box of a power carrier from falling due to failure or aging of a hydraulic cylinder while it is raised by a dump or lift. More specifically, the invention relates to a fall prevention device and a control method thereof that performs a reverse operation in which a locking device operates to completely prevent the cargo box from falling when it stops rising, and the locking device is released only when it starts to fall. Generally, powered transport vehicles are used to load and transport feed, fertilizers, various agricultural materials, or harvested produce such as fruits and vegetables when raising livestock or cultivating agricultural products. This powered transport vehicle is equipped with a dump function that lifts the front of the cargo box and a lift function that raises or lowers the cargo box vertically, so that the overall operation of unloading the cargo after moving the cargo loaded in the configured cargo box can be conveniently performed. To this end, the dump and lift device of the power carrier's cargo box is configured to be driven by a hydraulic cylinder, and the hydraulic cylinder performs a dumping action by vertically lifting the cargo box or lifting only one side by pushing up the middle of one of the 'X'-shaped scissor link arms. However, hydraulic cylinders that perform dumping or lifting actions to raise the cargo box may occasionally be installed as defective products, and since their lifespan is short, failures such as wear of internal packing may occur after prolonged use, or pressure may leak from the hydraulic cylinder due to leakage in the hydraulic hose or connection parts, causing the hydraulic pressure supporting the cargo box to be released. When this phenomenon occurs, the cargo box suddenly falls, which can lead to damage to the cargo box and transport vehicle, as well as damage to the goods loaded in the cargo box, and serious accidents such as workers falling from the cargo box or workers being crushed under the cargo box. In particular, given that most workers in rural areas are elderly, accidents like the one mentioned above are characterized by slow response times and the potential for even minor incidents to result in serious injuries. Furthermore, if a hydraulic system failure occurs while heavy objects are loaded on the cargo bed or multiple people are on board, the impact will be even greater. FIG. 1 is a side view of a powered carrier according to the present invention. FIG. 2 is a partial perspective view of a powered transport vehicle according to the present invention. FIG. 3 is a perspective view of the main part of a powered transport vehicle according to the present invention. FIG. 4 is a perspective view of a portion of FIG. 3 seen from the opposite side. FIG. 5 is a diagram of the engaging operation state of the latch bar and latch pole according to the present invention. Hereinafter, the configuration of the cargo box fall prevention device for an agricultural power carrier and the control method thereof according to the present invention will be described in detail. This description is based on an embodiment for implementing the present invention and is not intended to limit the technical concept pursued by the present invention to the form described in the embodiment described in this document, and should be understood to include various modifications, equivalents, and/or alternatives of the embodiment of the present invention. The power carrier subject to the present invention is equipped with tracks or tire-shaped wheels (2) on both lower sides of the vehicle body (1) and is driven by power from an engine or motor. In order to lift the cargo box (3), a scissor-type link arm (4) connected in an 'X' shape is installed between the bottom surface of the cargo box (3) and the vehicle body (1), and then the cargo box (3) is raised by simultaneously pushing up both scissor-type link arms (4) on one side using a hydraulic cylinder (5). In the present invention, a cylinder bracket (5-1) is fixed to a crossbar (6) connected across both sides of a scissor-type link arm (4) operated by a hydraulic cylinder (5), and the rod of the hydraulic cylinder (5) is connected to the cylinder bracket (5-1) in a hinge manner, and the lower end of the hydraulic cylinder (5) is supported by a hinge to the vehicle body (1). After fixing latch brackets (11) to both sides of the cylinder bracket (5-1) of the above-mentioned crossbar (6), a latch bar (10) is installed on the latch bracket (11) in a hinge manner. The latch bar (10) is formed with a continuous series of locking projections (12) and locking grooves (12') that are repeated. The upper surface of the locking projection (12) or the lower surface of the locking groove (12') is formed as an inclined surface (12-1), and the lower su