JPS61139534A - Indicator of condition of changed-over hinge on three-turn dump truck - Google Patents

Abstract

PURPOSE:To improve safety of operation by indicating the condition of a cargobox corresponding to each slanting direction of the hinge, when only the corresponding hinge is securely under the engaging condition, to slant the cargo box in the selected slant direction. CONSTITUTION:Hinge shaft 3 on the bottom of a cargo box 1 and hinges consisting of a shaft bearing member 5 provided on a chassis 4 and a hook 6 are provided on four front, rear, left and right portions between the chassis 4 and cargo box 1 and a hinge changing-over unit 21 is provided which changes over each hinge between the engaging and disengaging conditions. This unit 21 is constituted to pivot a stopper 19 through a rod 20 by the operation of a motor M and controlled through a control box 24 according to the operation of a selection switch on a control board 23. Also, when a proper detector detects that the hinge corresponding to the selected slant direction is sequrely under the engaging condition, such condition is adaped to be indicated on an indicator.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hinge switching state display device for a three-roll dump truck.

(Prior art) Conventionally, in a three-turn dump truck, hinges are provided at four locations on the front, rear, left, and right between the chassis and the cargo box, and the hinges are composed of a hinge shaft, a shaft receiver, and a hook. By rotating the box in accordance with the direction of tilting the box, engaging and releasing the corresponding hinge shaft, and extending the hydraulic cylinder with the box tilting operation lever, the box can be moved in the desired direction. It is designed to tilt (see, for example, Japanese Patent Laid-Open No. 58-50822 and Japanese Patent Laid-open No. 1003E129/1989).

In the structure described above, the hook is positioned in either the engaged IF state or the released state, but due to an erroneous operation or the like, the hook may be located between the engaged state and the released state. If the cargo box is tilted using the cargo box tilting operation lever (that is, the hook is half-hung on the hinge), there is a risk that the cargo box may fall from the vehicle chassis.

From this point of view, as shown in Japanese Patent Publication No. 58-41412, a device was invented that displayed the locked state of the hinge, but the hinge was changed manually. Therefore, the operability is poor, and loaded materials such as earth and sand accumulate near the hinge, which may cause malfunction depending on the location of the limit switch.

Furthermore, even if the lamp does not turn on properly due to the switching operation of the hinge, it cannot be determined whether the lamp is defective or broken, so accurate display cannot be expected.

(Problem to be solved by the invention) The present invention has been made in view of the above points, and when only the hinge corresponding to the tilting direction of the cargo box is in the engaged state, The present invention provides a hinge switching state display device for a tri-turn dump truck that can display the following conditions.

(Contact means for solving the problem) The present invention provides a hinge switching actuation device m operated by a selection switch, and a detection device detects the locked state and released state of the hinge by this hinge switching actuation device. In order to allow the cargo box to be tilted in the selected tilting direction, if only the corresponding hinge is securely locked, it is configured to display a message corresponding to each tilting direction. be.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a hinge shaft 3 in the longitudinal direction of the vehicle body is fixed to each bracket 2 protruding from the bottom of a cargo box 1 of a tri-turn dump truck at four locations on the front, rear, left and right sides, and a chassis 4 is attached to each hinge shaft 3. Shaft receiving members 5 are fixedly installed at four locations on the front, rear, left and right sides of the vehicle, and hooks 6 are rotatably supported on the shaft receiving members 5 (see Fig. 3). Hinges are constructed at four locations.

Reference numeral 7 denotes a cargo box tilting operation lever for operating the tilting operation of the cargo box 1, and is provided in the driver's cab. As shown in detail in FIG. 2, this cargo box tilting operation lever 7 is rotatably attached to a pivot shaft 8, and has a U-shaped engagement ring 9 and an abutment ring 9 in a cross section in the middle. The members 10 are each fixedly installed.

By the way, the L-shaped mounting plate 11 installed upright on the board of the driver's seat
A limit switch 12 for detecting the tilting state of the cargo box tilting operation lever 7 is attached to the upper part of the container, and the abutting member 10 comes into contact with the movable terminal 12a of the limit switch 12. Then, the cargo box tilting operation lever 7 is moved to the cargo box tilting position P.
When the limit switch 12 is at I, the limit switch 12 is turned on.

On the other hand, a lock lever 14 serving as a lashing means is pivotally attached to the lower part of the mounting plate 11 so that its base end can be rotated about a pivot shaft 13, and the locking portion 14a at the tip is connected to the cargo box tilting operation lever 7.
is configured to engage with the engagement ring 9 and make the operating lever 7 inoperable when it is in the cargo box prone position P1. Further, a locking IF piece 15 is protruded from the lock lever 14, and a spring 16 is interposed between the locking piece 15 and the base plate, so that the lock lever 14 is normally rotated counterclockwise.
The lock portion 14a of No. 4 is biased in the direction of detachment from the engagement ring 9. Further, a long hole 14c is formed in the protrusion 14b near the base end of the lock lever 14, and the long hole 14c
An engagement pin 18a provided at the tip of a rod 18, which is retracted by the excitation of a solenoid 17 serving as a driving means, is loosely fitted.

This solenoid 17 is attached to the mounting plate 11 below the limit switch 12.

By the way, each of the aforementioned hooks 6 is for locking the hinge shaft 3 to the shaft receiving member 5, and is constantly urged in the release direction by a spring (not shown), and is rotatably supported on the shaft receiving member 5. It is held at the locking position P2 by the stopper 19.

This stopper 19 is linked to a hinge switching actuation device 21 via a rod member 20 inserted into the frame 4a, and this hinge switching actuation device 21 is connected to the electric motor M.
and a reducer 22 connected to the electric motor M. Although detailed explanation will be omitted, the rotational movement in the reducer 22 is converted into linear reciprocating motion.

Therefore, the reciprocating movement of the rod member 20 by the hinge switching actuating device 21 causes the hook 6 to be rotated between the strike position P3, which holds the hook 6 at the latching position P2, and the release position P4, where the hook 6 is released from the latching position. Stop opening position P5 that allows
A stopper 19 is configured to rotate between.

23 is the operation panel, push button FBI for rear dump.

Left side dump push button FB2. Push button P for right side dump
B3, lamp inspection push button FB4 and power relay XR
is provided. 24 is a control box that houses a control system, and 25 is an alarm buzzer.

Next, the control system of the above device will be explained with reference to FIGS. 4 and 5.

First, when the key switch SWI is turned on by inserting the engine key, the power relay XR is energized and the relay contact x
r turns ON.

Therefore, when the cargo box 1 is on the vehicle platform 4'', the cargo box tilting operation lever 7 is in the cargo box prone position, so the limit switch 12 is turned on.

In this state, if you want to perform a rear dump, press the rear dump pushbutton FBI, and the relay R1 will be energized.
When the relay contact rl turns 0N-OFF, the movable terminals 35, 36, 37, 38, 39, and 40 interlock with each other in the motor circuits 31, 32, 33, and 34.
．． 41 and 42 constitute the rotation of electric motors Ml, M2, M3 and M4, L/-Xi, X4. X5. X8
is in a demagnetized state, and relays X2, X3, X6, and X7 are in an energized state, so the pilot lamp PLI indicating that rearward dumping is possible lights up.

Note that the electric motors Ml, M2. The positional relationship between M3 and M4 is as shown in FIG.

After that, when the cargo box tilting operation lever 7 is operated to extend the dump cylinder (not shown), the front left and right hooks 6.
6 is rotated by the tensile force of a spring (not shown) as the hinge shaft 3.3 moves upward, and the hinge shaft 3.3 is disengaged, so that the cargo box 1 is dumped backward.

On the other hand, when returning the cargo box 1 from the dumped state, the cargo box tilting operation lever 7 is operated in the opposite direction to contract the dump cylinder and the cargo box 1 is laid down. The shafts 3 and 3 come into contact, and the hook 6.6 is rotated against the tension of the spring, and the hook 6.6 and the hinge shaft 3°3 are engaged, and the cargo box l is safely placed. The vehicle is in a running position that allows it to run.

When performing left-side dumping or right-side dumping, press pushbutton PB2 for left-side dumping or pushbutton PB3 for right-side dumping as in the case described above, and each motor circuit 3
1.32.A switching operation is performed at 33 and 34, and only the hinge shaft 3 at a predetermined portion is in a releaseable state, and accordingly, the pilot lamp PL indicating that dumping is possible on the left side is activated.
2 or the pilot lamp PL3 indicating that dumping on the right side is possible lights up and dumping operation is possible.

By the way, for example, if the front left stopper 19 is located between the stop position P3 and the stop open position iP5, the movable terminals 35 and 36 of the motor circuit 31 are at intermediate positions other than the open position and the closed position. , relays XI and X2 are energized at the same time, an abnormal state is detected by the abnormality detection circuit 43, and the timer T1 is excited. If this abnormality continues for 2 seconds or more, the a contact ti is turned on, so the alarm buzzer 25 sounds, and the b contact t1 is turned off to demagnetize the pilot lamp PLI. Furthermore, a
As the solenoid 17 is energized by turning on the contact tl, the rod 18 is moved backward, so the lock lever 14 rotates and locks the cargo box tilting operation lever 7, making it impossible to tilt the cargo box l. (See solid line in Figure 2).

Then, when the a contact t1 remains on for 2 seconds or more, another timer T2 operates, and the b contact t2 turns off.
becomes. Note that once the lock lever 14 is locked, the spring 16 will remain at the put point position beyond the pivot 13 unless the lock is released by manually pushing the release lever 45, so even if the lock returns to normal, the lock will not be activated. continue.

Then, the aforementioned pilot lamp PL1. PL2,
To determine whether the demagnetization of PL3 is due to a lamp defect, simply press the lamp inspection push button FB4. If the pilot lamps PLI to PL3 turn on with the inspection push button FB4, the hinge is in the desired locked state and released. It becomes clear that the state has not changed.

In this way, since the dumping direction can be controlled electrically, switching the dumping direction becomes easy and accurate, and the dumping direction switching lever that was conventionally installed in the operator's cab can be omitted. The space inside the driver's cabin is larger, making it more comfortable to live in.

In this embodiment, the hook 6 is indirectly switched between the locked state and the released state using the stopper 19, but the hook 6 and the rod member 20 can be directly connected and locked without using the stopper 19. It may be possible to selectively switch between the state and the release state.

Furthermore, in this embodiment, a telescoping cylinder (not shown) is operated to tilt the cargo box, and the manual control valve switched and controlled by 8-7 is used to perform telescoping control. It may be constructed as a switch, and a telescoping sill (not shown) may be telescopically controlled by an electromagnetic control valve. In this case, it is also possible to use the selection switch and the cargo box tilting operation switch.

(Effects of the Invention) As described above, in the present invention, when only the hinge corresponding to the tilting direction of the cargo box is reliably and properly in the engaged state, the display is displayed corresponding to each tilting direction. Therefore, the operator can accurately grasp the switching state of the hinge.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a perspective view showing the overall configuration of a three-turn dump truck, FIG. 2 is an explanatory view of the vicinity of the cargo box tilting operation lever, and FIG. FIG. 4 is an electric circuit diagram of the control system, and FIG. 5 is an explanatory diagram showing the arrangement of the electric motor.

Claims (2)

[Claims] (1) The hinge is constructed by providing hinge shafts at four locations on the front, rear, left and right sides of either the vehicle chassis or the bottom of the cargo box, and shaft receiving portions, hooks, etc. corresponding to the hinge shafts at four locations on the other side, front, rear, left and right. In the three-turn dump truck, the hinge switching actuating device selectively operates the hinge between a locked state and a released state, a selection switch operating the hinge switching actuating device corresponding to each tilting direction, and the hinge a detection device that detects the operating state of the switching actuating device, and when the detection device detects that only the hinge corresponding to the tilting direction selected by the selection switch is securely in the locked state, each tilting direction 1. A hinge switching state display device for a three-roll dump truck, characterized in that it is provided with a display device that displays a display corresponding to the above. (2) The display device is a pilot lamp that lights up each of the rear dump state, left dump state, and right dump state, and an inspection switch is connected in parallel to the lamp. The hinge switching status display device for the three-turn dump truck described above.