JPS61223236A - Governor controller for working car - Google Patents

Abstract

PURPOSE:To prevent the breakage of parts with the compact constitution by regulating the turn over a prescribed angle of the arm of a control motor by a stopper and detecting the excessive load generated onto the motor and cutting off the electric conduction of the motor. CONSTITUTION:When a governor control apparatus 2 is switched to, for example, an upper limit position, a main switch 11 is turned-ON, and a governor switch 4 is connected to the upper-limit relay R1 side of a parallel circuit 15. Then, the electric current of a main circuit 10 flows in the first circuit 13, and the relay R1 is put into electric conduction, and then the relay contact points r1 and r1 of the third circuit 17 are brought into contact, an a control motor 3 revolves normally. Therefore, the number of revolution of an engine 1 is increased to an upper limit position through an arm 5, wire 7, bell crank 8 and a governor lever 6. When the arm 5 contacts with a stopper 9, the motor 3 is applied with an excessive load, and a current sensor 12 detects said excessively loaded state, and a contact point 14 is opened to stop the motor 3.

Description

[Detailed Description of the Invention] (aL Industrial Field of Application) The present invention is used in the field of work vehicles in which a governor controller and a trawl device are installed on an engine that also serves as a drive source for work equipment such as a concrete pump. .

(b) Prior Art As shown in FIGS. 3 and 4, a conventional governor control device includes an arm (03) attached to a control motor (02) controlled by a governor switch (01).
The arm (03) is connected to a governor lever on the engine side via a push-pull wire (04). Further, a lower limit switch (05) and an upper limit switch (05) are provided at a predetermined angle rotation position of the arm (03) to regulate the engine speed at the minimum and maximum positions, and furthermore, a lower limit switch (05) and an upper limit switch (05) are provided at the predetermined angle rotation position. A pair of stoppers (06) (08) are provided at slightly larger angle positions, and the limit switch (0
5) Even when (05) malfunctions, rotation of arm (03) is restricted to prevent breakage of push-pull wires, etc.

However, with the above structure, a pair of stoppers and a limit switch must be installed near the control motor, which increases the size of the entire device and makes installation work extremely difficult in cases where there is little extra space, such as in a vehicle. There was a problem of difficulty.

(C) Problems to be Solved by the Invention The present invention solves the above-mentioned problems.A pair of stoppers is provided at a predetermined angle rotation position of the arm of the control motor, and the arm abuts against the stopper. After that, an overload occurring in the control motor is detected by a current sensor, and the energization to the control motor is canceled.

(d) Means for Solving the Problems The present invention provides a working vehicle in which a working device is driven by an engine, in which a governor lever provided on the engine side is connected to an arm provided on a control motor via a transmission means. The rotation of the control motor can be controlled by a governor switch, a pair of stoppers are provided near the arm to restrict rotation of the arm beyond a predetermined angle, and a stopper is provided on the circuit of the control motor. The invention relates to a governor control device for a work vehicle, which is provided with a current sensor in series to detect overload after the arm contacts the stopper, and a normally closed current sensor contact on the governor switch circuit. be.

(e) Example The following example will be explained using drawings. (1) is a driving engine, and the engine (1) drives a working device (for example, a concrete pump in a concrete pump truck) mounted on a vehicle. It is also used as a source.

The engine +1) is equipped with a governor control device that regulates the rotation speed of the engine (1) within a set upper and lower limit range! f (2) is provided.

The governor control device (2) will be explained below. (3) is a control motor, and the control motor (3) is controlled in forward and reverse directions by a governor switch (4).

An arm (5) is attached to the control motor (3), and a push-pull wire (7) serving as a transmission means connects the free end of the arm (5) to the engine and a governor lever (6) provided on the (1) side. They are connected by a bell crank (8).

Further, the arm (5) is located close to the engine (
A pair of stoppers (9) (9) are provided at both ends of the rotation angle of the arm (5) corresponding to the upper and lower limits of the rotation speed in 1), and the arm (5) is in contact with the stoppers (9) (9). When they come into contact, further rotation of the arm (5) is restricted.

Next, to explain the electric circuit of the control motor (3) in Fig. 2, there is a main switch (11) on the main circuit Ol.
and a current sensor (12), and a main switch (1
1) and the main circuit Ql between the current sensor (12)
The first circuit (13) is branched from the first circuit (13).
) On the top are the normally closed current sensor contact (14), the governor switch (4), the upper limit relay R1, and the lower limit relay R.
A parallel circuit (15) is provided in which the two are separately interposed.

The main circuit α in front of the current sensor (12)
A second circuit (16) and a third circuit (17) are provided in parallel, and the second circuit (16) has a normally closed relay contact rl of the upper limit relay R1 and a normally closed relay contact r of the lower limit relay R2.
2 are provided in series, and the third circuit (17) is provided with respective relay contacts r1 and r2 in an arrangement opposite to that of the second circuit (16).

A communication circuit (18) connects the relay contacts r1 and r2 of the second circuit (16) and the third circuit (17), and the communication circuit (18) is provided with a control motor (3),
When an overload occurs on the control motor (3),
The current sensor (12) detects this and opens the current sensor contact (14).

The present invention has the above-mentioned configuration. Next, the operation will be explained. First, when switching the governor control device (2) from the state shown in FIG. 1 to the upper limit position, the main switch (11
), then connect the governor switch (4) to the parallel circuit (1
5) Connect to the upper limit relay R1 side. As a result, the current of the main circuit Qll) flows through the first circuit (13) and energizes the upper limit relay R1.

When the upper limit relay R1 is energized, the relay contacts rl and rll of the second circuit (1[) and third circuit (17) are connected, and the control motor (3) rotates in the normal direction, causing the control motor (3) to rotate in the normal direction. Arm (5), push-pull wire (7), bell crank (8) and governor lever (6)
Increase the rotation speed of the engine (1) through
Raise it to the limit position.

If you continue to press the governor switch (4) with the arm (5) of the control motor (3) reaching the upper limit position, the arm (5) will be in contact with the stopper (9), so the control motor (3) will ), the current sensor (12) detects this and opens the current sensor contact (14).

When the current sensor contact (14) opens, the upper limit relay R
1 is cut off, relay contacts r1rl are opened, and the control motor (3) is stopped.

Also, when the governor switch (4) is switched to the lower limit relay R2 side of the parallel circuit (15), the lower limit relay R2 and relay contacts r2 and r2 stop the reverse rotation of the control motor (3) at 3 as described above. Saseko: I can do it.

. (f) Effects of the Invention As described above, the present invention uses a stopper to restrict rotation of the arm beyond a predetermined angle with respect to the arm of the control motor, and also detects an overload occurring in the control motor and energizes the control motor. Since a current sensor is provided to cut off the current, there is only a stopper near the control motor, making the entire device very compact and solving all of the problems of the prior art.

[Brief explanation of drawings]

FIG. 1 is an overall diagram, FIG. 2 is an electric circuit diagram, FIG. 3 is a conventional example, and FIG. 4 is an electric circuit diagram of the conventional example. (2) is the governor control device, (3) is the control motor, (4) is the governor switch, (5) is the arm (9) is the stopper, (12) is the current sensor, (14) is the
) is the current sensor contact. Applicant Kyokuto Kaihatsu Kogyo Co., Ltd. Figure 1 Figure 22

Claims (1)

[Claims] In a work vehicle in which the work equipment is driven by an engine,
A governor lever provided on the engine side is connected to an arm provided on the control motor via a transmission means, and the control motor can be rotationally controlled by a governor switch, and an arm is provided at a position close to the arm. A pair of stoppers are provided to restrict rotation beyond a predetermined angle, and a current sensor is provided in series on the control motor circuit to detect overload after the arm contacts the stopper, and a governor switch circuit is provided. A governor control device for a work vehicle that has a normally closed current sensor contact on top.