JPS58218437A - Device for controlling operation of lift provided on damp truck - Google Patents

Abstract

PURPOSE:To enable a cargo carrier to be lifted only when a cargo box is fixedly fastened, by controllably driving a motor with a circuit comprising a limit switch and others operatively associated with a lift switch for lifting the cargo carrier and the swing motion of a hook for fixedly fastening the cargo box. CONSTITUTION:When a lift of a damp truck moves vertically a cargo carrier 16 through upper and lower links 9, 10 with the operation of a hydraulic power unit 24, the cargo carrier 16 is pivoted to open the rear surface of a cargo box 3 in the inclination of the cargo box 3. The cargo box 3 is fixedly fastened in the normal travelling with a hook 25 operated by an operating lever 27 and engaging a lock pin 26 provided on the cargo box 3. In this case, a limit switch LS is provided near the hook 25 so that LS is turned on when the lock pin 26 is fixedly fastened by the the hook 25. This LS together with a lift switch is connected in series with an electric circuit of a motor for driving a hydraulic motor of the hydraulic power unit 24.

Description

[Detailed Description of the Invention] The present invention is a lift device in which a lift device is attached to a cargo box that can be lifted from the rear, and cargo on the ground can be loaded into the cargo box using the lift device. This invention relates to an operation control device for a lift device installed in a dump truck, which allows the device to be operated safely and under ω1 control.

Generally, in a dump truck, a hydraulic cylinder is interposed between the cargo box and the distorted body to raise and lower the cargo box, but this hydraulic cylinder communicates with the oil tank when the cargo box is lowered onto the vehicle body. Because of this, it is not possible to secure the cargo box using a hydraulic cylinder.

By the way, when a lift device is attached to the rear end of a dump cargo box, and the cargo is loaded into the cargo box using this lift device, if the cargo is heavy, the cargo box will jump backwards due to its own weight, causing the lift platform to There is a risk that the luggage on top will fall and dry.

Therefore, in order to eliminate the above-mentioned danger, a lashing device using a hook is installed between the front cargo box and the distorted body, but it is necessary to operate the lashing device each time when the lift device is operated ω1. If you tend to forget to operate the lashing device, you will end up with the problem of the cargo falling from the lift platform as described above.

The invention is intended to definitely solve the above-mentioned problems, and its purpose is to provide a hook that operates in conjunction with the hook for lashing the cargo box, and a mint switch that operates in connection with the construction of the hook for securing the cargo box and lifting the receiving platform of the lift device. A circuit incorporating a lifting switch controls the energization of the electric motor that operates the lift device.

To explain the embodiment of the great invention with reference to the figures, (1) is the vehicle body, +21 is a subframe on the vehicle body (1), and 13) is a cargo box mounted on the subframe (21).
It (3) is the subframe (21 centered around the rear hinge part +41).

It is designed so that it can be dumped backwards.

)□ (5) is a lift device attached to the rear end of the cargo box (3).
The following is an explanation of this lift device (5).
A mounting bracket (6) is provided at the rear end of the main girder (3), and this mounting bracket (6) has a connecting piece (8) that is pivotably supported at its upper part on a shaft (7) that can swing back and forth. has been done.

An upper link (9) is attached to the pivot support (7) of the connecting piece (8).
The base of the lower link 1110 is pivotally supported integrally with the shaft (7), and the base of the lower link 1110 is pivotally supported at the bottom of the connecting piece (8).
1 has been done.

The tip of the upper link (9) and the tip of the lower link Oe are pivotally supported t13 (141) on a vertical mounting column 1121, and a pair of front 2J connections: i'+s+, 11f1.F (
7) II:y '7191 (1(l) and the mounting column (1z) form a parallel link mechanism.

(151n a &E) This is a stopper fixed to the mounting bracket (6) that restricts the force swing 1f of the connecting piece (8) and holds the connecting piece (81) vertically.

(16) is a mounting column (12, with a rotatable pivot U at the bottom)
The cargo receiving platform 161 is equipped with a mounting post (12
The upper part of 1 □ and the loading platform! +61 (The retaining rod (181) is held in a substantially horizontal position, and the load pile:::,...

cradle! When the J61 is stored vertically, it covers the rear surface of the cargo box (3).

An arm 0 is attached to the shaft (7) that pivotally supports the one-part link (9).
9 is integrally attached, and the piston rod of the hydraulic cylinder (2), which is pivotally supported on the mounting bracket (5), is connected to the tip of this arm (4), and the parallel link mechanism is activated by the retracting operation of this hydraulic cylinder (2). The loading platform Oe can be raised and lowered at the same time as the loading stage is moved.

121) is the loading platform f161? When stored vertically,
A lashing means for lashing the load receiving platform f161 is shown on the same mounting column, and this lashing means] is connected to a locking pin that protrudes from the side of the flat pedestal Q6) and a locking pin drilled in the upper end of the mounting column (17J). It consists of a locking hole (2) that engages the locking pin. (
241 indicates the dimensions of an oilfield power unit that incorporates an electric motor, oilfield pump, oil tank, and pulp.

In Fig. 3, the base part is pivotally supported by the subframe (21) at the front end of the loading box (3), and the 7 parts beyond that are the loading box]
3) shows a hook for securing a cargo box that is engaged with the lock pin (3), and this hook (3) is swing-operated by operating the operating lever.

Next, while explaining the hydraulic system shown in Fig. 4, vD is a hydraulic pump driven by an electric motor (PIFi electric motor (foundation)), and hydraulic pump fP+ and hydraulic cylinder ■
It is connected by a main piping device with a check valve in the middle. ■ is an auxiliary pipe that branches off in the middle of the main piping device and connects to the oil tank (31), and this auxiliary pipe (to) has a pulp that is switched by the operation of a solenoid (SQL), and this pulp ■ When switched to the left position, the hydraulic oil from the hydraulic pump (P) can flow into the hydraulic sill ■, and when the pulp (321) is switched to the right position, the hydraulic oil flowing into the hydraulic sill ■ can be flowed into the hydraulic sill ■. It can flow out to tank f311.

Next, the electrical system that controls the solenoid (SQL) of the front two pulps (SQL) and the electric motor 11M1 will be explained with reference to FIG. 5. (33) is the main switch (MS)'? - The installed main circuit (Foundation) is the first operating circuit that connects one end to the main circuit ■ and the other end to the pulp ■ solenoid (SOL). A lowering switch (sl) is installed.

(g) indicates a second operating circuit whose one end is connected to the main circuit and the other end is connected to the electric appliance + motor. The up switch (S2) that is operated to raise, and the hook c! 5)
In connection with the rocking motion of the 11th limit switch (LS), the limit switch (LS) is switched to 11 when the hook (c) engages with the locking pin (a) to secure the cargo box (3). and a relay switch (rl) operated by a relay (R) are interposed in series.

Note that (361 is a battery).

The uninvented structure has the above-mentioned configuration, and now to explain the case of loading cargo into the cargo box (3) using the receiving platform (161fi?), first, the vertical receiving platform 1161'f-ho is moved horizontally.Next, When the lowering switch GSI) is connected to e, the pulp (η solenoid (SQL) is energized, so the valve (Ω) is switched to the right position, which causes the hydraulic oil to pass through the hydraulic oil cleaning auxiliary pipe ■ in the hydraulic cylinder ■, ,'::: Oil tank (311): Oil will flow out to the oil tank (311), so the oil will be
descends.

Next, in order to raise the cargo platform (with the cargo placed on top and the cargo box 13) above the floor, first press the hook (2) on the operating lever.
5) Swing f to engage with the lock pin.

When the cargo box is secured as shown by the solid line in FIG. 3, the beam mint switch (LS) is connected to r/'i.

Next, when the up switch (S2) is connected, the relay (
R) is activated, and the corresponding relay switch (rl) is connected, so the current from the battery (to) flows through the second operating circuit (g) to the electric motor, which causes the electric motor to The motor (goods) is driven.

When the electric motor (goods) is driven, the hydraulic pump (P) is also driven, so the oil from the hydraulic pump (P) flows into the hydraulic cylinder through the main distribution ■. Hydraulic cylinder ω is extended. When the hydraulic cylinder +2Q] extends, the upper link (9) connected to the hydraulic cylinder
.

Part link shout is always 1 tell: Because compression is working,
The connecting piece (8
) is in contact with the stopper (151), so that the loading platform opening 61 is raised horizontally by the pair of links, and the cargo can be loaded into the loading box 13+.

In addition, in the position shown by the two-dot chain line in Figure 3, where the hook (C) is not engaged with the lock pin (A), the limit switch (LS) is disconnected, so the electric motor does not operate. Since the cargo receiving platform ( ) 61 does not rise due to this, it is safe.

Next, when transporting the parallax loaded in the cargo box (3) by an appropriate means, first raise the receiving platform (IB) to the highest position, then move the receiving platform U61 around the pivot support U71 at the base. and rotate it until it becomes vertical, the engagement pin c
! 51 moves downward and engages the hook (a)). At this time, if the locking bin (221 on the loading platform flGl side is inserted into the locking hole (231) on the mounting post (1'2 side), the loading tray (
16) is fixed to the mounting column (121).

In the above state, the parallaxes in the cargo box (3) are transported without falling out from the rear surface.

Next, when the loading box (3) is tilted backwards to dump the parallaxes in the loading box (3), the upper link (9) is held in place by the hydraulic cylinder ■, and the other lower link As the link (101, connecting piece (8), mounting post (121 and loading platform 1611d are free and the loading box 13) is tilted backwards), the loading platform (161 is integral with the mounting column f12, and the upper link ( 9) Move the cargo box (3) backward by pivoting the front shaft support +13
) The rear loading platform (161) is automatically opened and the loading box (3
) will be dumped.

As described above, the uninvented work #1 is related to the lifting switch that raises the loading platform and the rocking motion of the hook that secures the loading box.
Since the electric motor 11 is driven and controlled by a circuit incorporating a limit switch and a circuit built in, the loading platform cannot be raised unless the cargo box is secured with the hook. When loading cargo into a cargo box, the cargo box does not dump and the cargo on the receiving platform does not fall, making it extremely safe.

[Brief explanation of drawings]

Figures 1 and 2 are side views of the fc'I raft installed on the dump cargo box, Figure 3 is a partial side view of the hook part that secures the dump cargo box, Figure 4 is the hydraulic system diagram, and Figure 5 is the It is an electrical system diagram. (1) is the vertical body, 13) is the packing box, (5) is the lift device, (
161 is a loading platform, +251 is a hook, (S2) is a lift switch, (LS) is a kick switch, and (Foundation) is an electric morph. Applicant Kyokuto Kaihatsu Kogyo Co., Ltd. No. 27 Figure 3 Figure 4

Claims (1)

[Claims] The rear end of the cargo box, which is mounted on the vehicle body and can be tilted backwards around the rear hinge, is equipped with a lift device that raises and lowers the cargo platform, and the operation of this lift device is driven by an electric morph. In a lift device installed on a dump truck that operates by causing hydraulic oil from a hydraulic pump to flow into a hydraulic cylinder, a lift device is provided appropriately in front of the moe 2 hinge part to secure the cargo box and the @kikotai. A circuit incorporating a limit switch that operates in conjunction with the swinging punch 11 of the hook to be tied and a lifting switch that raises the loading platform is configured (-1) This circuit controls the energization of the electric motor. Operation control device for the lift device installed on Gunbu Truck.