JPH0759472B2 - Electric chain block - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric chain block in which a speed for performing hoisting or lowering is variable by forward / reverse control and speed control of a load sheave drive motor.

(Prior Art) Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 63-40198 and as shown in FIG. 6, a high-speed control relay (RyH) is provided in a control circuit section of a load sheave drive motor (M). Switching contact (RyH−
A high-speed variable resistor (VRH) and a low-speed variable resistor (VRL) are selected by c), and a time constant circuit (A) in which a resistor insertion circuit (R) and a capacitor (C) are connected in series, A trigger diode (D) that outputs a trigger signal based on the set value of the time constant circuit (A), and a triac (T) that controls the phase of an AC voltage waveform applied to the rectifier (B) by the trigger signal are provided. In addition to the speed control circuit (X), a switching circuit (F) that switches between the forward and reverse rotations of the motor (M) under the control of the forward and reverse rotation control relays (Ry1) (Ry2) is provided.
The speed control for hoisting and hoisting is performed by operating the switch box (S).

That is, by pushing the hoisting switch (SU) one step, the forward rotation control relay (Ry1) is excited to rotate the motor (2) forward, and the high speed control relay (RyH) is not excited, so that the low speed variable resistor (V
RL) for low speed hoisting and hoisting switch (SU)
By the two-step pushing, the high-speed control relay (RyH) is excited to insert the high-speed variable resistor (VRH) for high-speed hoisting, and similarly, the one-step pushing of the lowering switch (SD) lowers the speed. The lowering is performed at a high speed by pushing in two steps.

(Problems to be Solved by the Invention) However, in the above, low-speed and high-speed control is possible for both winding and winding, but high-speed control relay (Ry
H) is the hoist switch (SU) or the hoist switch (S)
Regardless of whether it is D) or not, it will be excited if one of them is pushed in two steps, and will be de-excited if pushed in one step.
Unless you touch the variable resistor (VRH) (VRL), basically,
High-speed hoisting and high-speed hoisting are at the same speed, and low-speed hoisting and low-speed hoisting are at the same speed, and the speed at the time of hoisting is reduced at a constant rate with respect to the speed at hoisting. There is a problem that cannot be done. That is, the speed applied to the motor (2) may be small during the winding operation in which the load direction and the rotation direction are the same as in the winding operation in which the motor (2) is rotated against the load load, but However, even when a low speed is selected, the hoisting speed and the hoisting speed are the same, so that an unnecessarily high voltage is supplied to the motor at the time of hoisting, which is disadvantageous in terms of motor life and the like.

In addition, the above has only one resistance insertion circuit (R), and the switching contact (RyH-c) that can be switched by the high-speed control relay (RyH) has a high-speed variable resistor (VRH) and a low-speed variable resistor. There is also a problem that it is not possible to meet the diverse needs of the user because it is limited to the specification that selectively selects the VRL (VRL).

An object of the present invention is to provide a plurality of resistor insertion circuits, individually provide relays for inserting and operating these resistors, and open the ON / OFF terminals of each relay to the switch box side to allow hoisting and unwinding. It is to provide an electric chain block that can perform speed control with a wide variety and realize specifications that meet various needs.

(Means for Solving the Problem) Therefore, in order to achieve this object, the present invention is based on the set values of the electric motor (2) for driving the load sheave (45) and the time constant circuit (3). A speed control circuit (5) for controlling the speed of the motor (2) and a forward / reverse control relay (Ry
1, Ry2), a motor control circuit section (4) having a switching circuit (8) for switching between forward and reverse rotation of the motor (2), and a switch box (9) for giving a control command to the motor control circuit section (4). ) And an electric chain block with
In the time constant circuit (3), a first resistor insertion circuit having a resistor for setting a speed ratio of winding up and a winding down, and a second resistor insertion having a resistor for setting a speed ratio of high speed and low speed. Circuit and the first and second speed control relays (Ry3, Ry4) for individually performing the insertion operation of each of these insertion circuits are provided, and the speed control relays (Ry3, Ry4) and the forward / reverse control relay are also provided. A lead extending from the switch box (9) is provided at each terminal of the motor control circuit section (4) by providing an operation terminal for individually turning on / off (Ry1, Ry2) and an input terminal for inputting an insertion resistance value. I decided to connect the wire terminals freely.

(Operation) The time constant circuit (3) has a first resistor insertion circuit having a resistor for setting the speed ratio of winding up and winding down, and a first resistor insertion circuit having a resistor for setting the speed ratio of high speed and low speed. Since the two resistance insertion circuit is provided, the motor control circuit section (4) has a configuration in which the hoisting or lowering speed of the load sheave (45) can be switched between high speed and low speed, and the hoisting and winding A constant speed ratio is provided between the lower part and the lower part, and the speed at the time of unwinding when the load load direction and the rotating direction match is always reduced by a constant ratio than at the time of hoisting.
This is a configuration in which the life of the motor (2) can be extended.

Then, under such a configuration, the first and second speed control relays (Ry3, Ry) that individually perform the insertion operation of each insertion circuit.
4) and operation terminals for individually operating ON / OFF of the forward / reverse control relays (Ry1, Ry2) and an input terminal for inputting the insertion resistance value are provided, and lead wire terminals extending from the switch box (9) can be freely attached and detached. Since they are connected, the hoisting or lowering speed of the load sheave (45) can be switched between high speed and low speed depending on the specifications of the switch box (9), and at the same time, the load sheave (45) can be wound at a constant speed. By adding a speed ratio, the speed at the time of unwinding when the load direction and the rotating direction match will be decelerated at a constant rate more than at the time of hoisting, so that the life of the motor (2) can be extended, etc. It can meet diverse needs.

(Embodiment) The gear shown in FIG. 4 is equipped with an electric motor (2) on one side of a main body housing (1) and has a motor shaft (20) having first to fourth gears (41 to 44). It is linked to the load sheave (45) via a reduction mechanism, and an overload prevention mechanism (50) and mechanical brake (60) are provided in the middle of this power transmission system.
And are provided.

The gear reduction mechanism includes a gear case (1
Drive shaft (30), which is arranged inside of (0) and whose first gear (41) is connected to the motor shaft (20) via a coupler (21).
The second gear (42) is provided at the shaft end of the intermediate shaft (7).
It is rotatably supported by the first hub (71) that is screwed into the screw portion (70). The third gear (43) is formed at the end of the intermediate shaft (7), and the fourth gear (44) is fitted to the cylindrical shaft (45a) integrated with the load sheave (45).

Then, the one side of the second gear (42) is connected to the annular friction plate (51).
Is disposed opposite to the flange (71a) of the first hub (71) via the first hub (71) via the annular friction plate (52) on the other side of the second gear (42). A push plate (54) that is spline-coupled to the boss (71b) of the and is pressed by the disc spring (53) is provided, and the second gear (42) is generated by the friction transmission force set by the disc spring (53). The rotational power transmitted to the intermediate shaft (7) is transmitted from the first hub (71) to the intermediate shaft (7), and when the load acting on the load sheave (45) exceeds the friction transmission force, it slips to prevent the overload. It constitutes the mechanism (50).

Further, a second hub (72) screwed into the screw portion (70) is arranged between the third gear (43) and the first hub (71), and the boss of the second hub (72) is arranged. As shown in FIG. 5, the portion (72b) rotatably supports the ratchet wheel (62), which is prevented from free rotation in the lowering direction by the reverse rotation preventing claw (61), and the ratchet wheel (6).
2) and the flanges (71a) (72a) of the hubs, the annular friction plates (63) (64) constituting a friction engagement portion.
To form the mechanical brake (60).

The motor (2) provided in the chain block configured as described above is controlled by the motor control circuit section shown in FIG. This motor control circuit section (4) uses a commercial AC power source (E) as a power source,
Speed control circuit (5), rectifier circuit (6), switching circuit (8)
And is controlled by a command from the switch box (9).

The speed control circuit (5) includes a resistor insertion circuit (31) (3
2) A time constant circuit (3) in which a fixed resistor (R1) and a capacitor (C2) are connected in series, and every half cycle of the AC power supply (E) at a timing according to the set value of the time constant circuit (3). It is equipped with a trigger diode (SSS) that outputs a trigger signal to and a triac (Trc) that controls the phase of the AC voltage waveform by this trigger signal. The effective value of the voltage supplied to the motor (2), that is, the rectifier circuit (6) The DC voltage value after passing through is changed. Incidentally, (30) is an AC power source (E)
After discharging the capacitor (C2) repeated every half cycle, the initial charge remaining in the capacitor (C2) is reset to the same level in the positive half cycle and the negative half cycle, and the positive and negative phase control is made uniform. It is a reset circuit that is configured to be made up of four diodes (D1, D2, D3, D4) and two fixed resistors (R2, R2).

The rectifier circuit (6) includes a bridge-type full-wave rectifier (DB) and a smoothing capacitor (C5), and aligns the polarities of the AC voltage phase-controlled by the speed control circuit (5) to the motor (2). It converts the supply voltage to direct current.

The switching circuit (8) includes a normally open contact (Ry1-a) (Ry2--) for each of the forward rotation control relay (Ry1) and the reverse rotation control relay (Ry2).
a) is combined, and the polarity of the DC voltage to the motor (2) is inverted by switching the relays (Ry1) and (Ry2), and the motor (2) is normally or reversely rotated.

In addition, between the terminals of the motor (2), the normally closed contacts (Ry1-b, Ry2-b) of the forward / reverse relay and the load resistance (R5) are provided in series so that the motor (2) generates electricity when the operation is stopped. The load circuit is connected when it acts as a machine.

With the above configuration, the time constant circuit (3) includes a parallel circuit of a series circuit of a variable resistor (VR1) and a normally open contact (Ry3-a) and a normally closed contact (Ry3-b). The 1st resistance insertion circuit (31), the 2nd resistance insertion circuit (32) provided with the series circuit of the variable resistor (VR2) and the normally closed contact (Ry4-b), and the normally open contact (Ry4-a) in parallel. And is interposed in series, the first speed control relay (Ry3) for operating each contact in the first resistance insertion circuit (31) and each contact in the second resistance insertion circuit (32) are operated. A second speed control relay (Ry4) is provided. Then, operation terminals (TA7) (TA6) (TA5) for individually operating ON / OFF of the first and second speed control relays (Ry3, Ry4) and the forward / reverse control relays (Ry1, Ry2).
(N1) and (N2), and an input terminal (TA9) (T for inputting an insertion resistance value to each parallel path in the second resistance insertion circuit (32).
A4) and (TA8) are provided, and lead wire terminals extending from the switch box (9) are detachably coupled to these terminals. The terminals (N1) and (N2) of the forward / reverse control relay among the above terminals utilize screw terminals provided on the relay body, and the other terminals are provided on the printed circuit board that constitutes the speed control circuit (5). Uses contact terminals. TA1 to 10 are all contact terminals.

The switch box (9) shown in FIG. 1 is a two-stage push-up type hoisting switch (SU) that commands a low speed (L) by one pressing operation and a high speed (H) by two pressing operations. ) And a similar two-stage push-down switch (SD), equipped with lead wire terminals (COM, UP, DOWN, HIGH) of these switches, and with a low-speed variable resistor (VR3) It has a variable resistor for high speed (VR4) and is provided with lead wire terminals (COM, HIGH, LOW) of these variable resistors.

Thus, the lead wire terminal (CO
M) to the terminal (TA5) of the motor control circuit, the lead wire terminal (UP) to the terminal (N1), the lead wire end (DOWN) to the terminal (N2), and the lead wire terminal (HIGH ) Terminal (TA6)
And the lead wire terminal (COM) in the variable resistor section to the terminal (TA9), the lead wire terminal (HIGH) to the terminal (TA4), and the lead wire first terminal (LO).
By connecting W) to the terminal (TA8) and connecting the terminals (N2) (TA7) of the motor control circuit section, the following operation modes 1 to 3 can be realized. That is, by pressing the hoisting switch (SU) one step, the first and second
The speed control relays (Ry3) (Ry4) remain de-energized, the variable resistor (VR1) of the first resistor (31) is short-circuited,
The variable resistor (VR2) of the second resistance insertion circuit (32) is in the inserted state, and the adjustment value of the low speed variable resistor (VR3) of the switch box (9) and the second resistance insertion circuit (32)
The low-speed hoisting operation is performed according to the sum of the set value of the variable resistor (VR2). At this time, the resistance component (ΣR) of the time constant circuit (3) is expressed by the following equation by adding the fixed resistor (R1) to the total resistance value.

ΣR = VR3 + VR2 + R1 By pressing the hoisting switch (SU) in two steps, the second speed control relay (Ry4) is excited and the second resistance insertion circuit (32)
The variable resistor (VR2) of No. 2 is excluded, and the high-speed hoisting operation that matches the adjustment value of the high-speed variable resistor (VR4) of the switch box (9) is performed. The resistance component at this time is: ΣR = VR4 + R1 The first speed control relay (Ry3) is excited and the second speed control relay (Ry4) is excited by pressing the lower switch (SD) one step.
Deenergization is maintained, the variable resistor (VR1) of the first resistance insertion circuit (31) is inserted, and the variable resistor (VR2) of the second resistance insertion circuit (32) is maintained in the inserted state, The adjustment value with the low speed variable resistor (VR3) of the switch box (9) and the set value with each variable resistor (VR1) (VR2) of the first and second resistance insertion circuits (31) (32) The low-speed unwinding operation is performed according to the sum of the above. The resistance component at this time is as follows: ΣR = VR3 + VR1 + VR2 + R1 By pressing the lower switch (SD) in two steps, the first and second speed control relays (Ry3) (Ry4) are excited and the first resistance insertion circuit (31) The variable resistor (VR1) is inserted, the variable resistor (VR2) of the second resistance insertion circuit (32) is excluded, and the adjustment value of the high speed variable resistor (VR4) of the switch box (9), Variable resistor (VR1) of the first resistance insertion circuit (31)
The high-speed unwinding operation is performed in proportion to the sum of the set value in. The resistance component at this time is as follows: ΣR = VR4 + VR1 + R1 Here, the larger the resistance component is, the larger the time constant is, and the trigger output timing is delayed, resulting in a slower speed. When the low speed selection is made by pushing, the speed is reduced by the addition of the variable resistor (VR2) in the second resistance insertion circuit as compared with the high speed selection made by the two-step pushing. In addition, the lowering switch (S
When the winding up is selected to press D), the speed is reduced by the addition of the variable resistor (VR1) in the first resistance insertion circuit as compared with the winding up to press the winding switch (SU). That is, the variable resistor (VR2) of the second resistance insertion circuit sets the speed ratio of high speed and low speed, and the variable resistor (VR1) of the first resistance insertion circuit sets the speed ratio of winding up and winding down. The setting is made, and even if the variable resistors (VR3) (VR4) attached to the switch box (9) are not set again one after another, when changing from high speed to low speed, deceleration of a fixed ratio can be performed automatically. Even when changing from winding to winding, deceleration can be automatically performed at a fixed ratio, which is excellent in operability, and since the speed during winding can be reduced compared to during winding, the life of the motor (2) can be improved. .

Further, as shown in FIG. 2, when the switch box (9) is constructed by using a single push up switch (SU1) and a down switch (SU1), the lead wire terminals (CO
M) to the terminal (TA5), the lead wire terminal (UP) to the terminal (N1), the lead wire terminal (DOWN) to the terminal (N2), and the variable resistors (VR3) (VR4). Side terminal (CO
M) (UP) (DOWN) are connected in the same way as in Fig. 1, while terminals (N1) (TA6) of the motor control circuit are connected, and
By making the terminal (TA7) an empty terminal, the following operation modes I and II can be realized. That is, by pressing the I. hoist switch (SU1), the second speed control relay (Ry4) is excited, the variable resistor (VR2) of the second resistance insertion circuit (32) is excluded, and the switch box (9 ) The hoisting operation is performed according to the adjustment value of the variable resistor (VR4). (ΣR = VR4 + R1) II. By pressing down the lowering switch (SD1), the second speed control relay (Ry4) is de-excited and the insertion state of the variable resistor (VR2) of the second resistance insertion circuit is maintained. The unwinding is performed according to the sum of the adjustment value of the variable resistor (VR3) of the box (9) and the set value of the variable resistor (VR2) of the second resistance insertion circuit. (ΣR = VR3 + VR2 + R1) Also in this case, when the winding down is selected, the second
The variable resistor (VR2) of the resistance insertion circuit can be decelerated by the amount added, and the motor life can be improved. In addition, this second
According to the specifications in the figure, the first speed control relay (Ry3) is unused and the variable resistor (VR1) in the first resistance insertion circuit is always short-circuited.

Furthermore, as shown in FIG. 3, the lead wire terminals (COM) (UP) are provided without providing the variable resistor in the switch box (9).
(DOWN) may be short-circuited. In this case, pressing the hoist switch (SU1) will cause the fixed resistance (R) of the time constant circuit (3) to rise.
The hoisting operation depends only on 1) and the hoisting switch (SD
By pressing 1), the unwinding operation can be performed according to the sum of the fixed resistance (R1) and the setting value of the variable resistor (VR2) in the second resistance insertion circuit. The addition of a resistor (VR2) can reduce the speed and improve the motor life.

As shown in each of FIGS. 1 to 3 above, since the operation terminal of each control relay and the input terminal of the insertion resistance are opened to the switch box (9), various needs can be met, It is possible to provide a wide variety of specifications.

(Advantages of the Invention) According to the present invention as described above, the hoisting or lowering speed of the load sheave (45) can be switched between high speed and low speed depending on the specifications of the switch box (9), and at the same time, the hoisting and unwinding can be performed. A constant speed ratio is provided between the two, and the speed at the time of unwinding, in which the load direction and the rotating direction coincide, is always decelerated by a more constant rate than at the time of hoisting, and the life of the motor (2) can be extended. It is possible to meet various needs of users.

[Brief description of drawings]

FIG. 1 is a control circuit diagram including a switch box of the first specification in the chain block of the present invention, FIG. 2 is a circuit diagram of a main portion including a switch box of the second specification, and FIG.
FIG. 4 is a circuit diagram of a switch box having specifications, FIG. 4 is a sectional view of the chain block body, FIG.
The figure is a circuit diagram of a conventional example. (2) ...... Electric motor (3) ...... Time constant circuit (4) ...... Motor control circuit section (5) ...... Speed control circuit (8) ...... Switching circuit (9) ...... Switch box (31) ( 32) Resistance insertion circuit (45) Load sheave (Ry1) (Ry2) Forward / reverse control relay (Ry3) (Ry4) Speed control relay

Claims (1)

[Claims] 1. An electric motor (2) for driving a load sheave (45), a speed control circuit (5) for controlling the speed of the motor (2) based on a set value of a time constant circuit (3), and a positive motor. The motor (2) is controlled by the reverse rotation control relay (Ry1, Ry2).
In a motorized chain block comprising a motor control circuit section (4) having a switching circuit (8) for switching between normal and reverse rotations, and a switch box (9) for giving a control command to the motor control circuit section (4), In the time constant circuit (3), a first resistance insertion circuit having a resistor for setting the speed ratio of winding up and down, and a second resistance insertion circuit having a resistor for setting the speed ratio of high speed and low speed. And the first and second speed control relays (Ry3, Ry) for individually performing the insertion operation of each of the insertion circuits.
4) is provided and each of these speed control relays (Ry3, Ry
4) and an operation terminal for individually operating ON / OFF of the forward / reverse control relays (Ry1, Ry2) and an input terminal for inputting an insertion resistance value are provided, and each terminal of the motor control circuit section (4) is provided with the above An electric chain block in which lead wire terminals extending from a switch box (9) are detachably coupled.