JPS5817100A - Lifting gear for fixed load of motor chain block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a low-V engine for suspending cargo, an electric motor for lifting or lowering the load, and a lifting and lowering mechanism for raising and lowering the cargo by rotating the motor in forward and reverse directions. Concerning the manual enblock provided in the switchboard, there is a first transformer that detects changes in the power supply current of the electric motor for hoisting or unwinding the load encroachment for suspending cargo, and the first transformer is located in front of the first transformer (σ) secondary side voltage. K @ 2 when rises above the set value
a second transformer which generates a secondary current having a rise value approximately equal to a drop value of the secondary voltage of the first transformer, and a stop circuit that completely interrupts one winding operation of the load hand engine by the motor π; The secondary side of the transformer is connected in series to the secondary side of the first transformer, and the sum of the secondary side outputs of the first and second transformers is kept approximately constant within a constant drop range of the power supply voltage. Something that drives a motor, for example, a device that uses the same electric fishing in parallel with a thousand enblocks? When actuated, the load to be lifted by A or the chain block is at the set maximum load.Even if the load voltage rises at A or the like, the load hand drives the dirt and suspends the load.

Inadvertent operation of the above-mentioned stop circuit caused the tray to be rolled up.
Prevents the excessive stoppage of the front P motor and allows you to safely and properly lift the load without being affected by changes in the voltage of the power supply on the load set in advance. It is an object of the present invention to provide a constant load raising device for an armature enblock as described above.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the same π group. FIG. and a hook (4), a three-phase AC power motor (5) for hoisting or lowering, and a raising and lowering switch 1Eil for driving the motor 151'1. It is equipped with a control a-Ib hook (8) to be incorporated into the system, and a wire rope 19) to be hung from a high place such as the ceiling, or a hanging tool 1101 to be connected to a trolley or the like which can be freely moved and installed on the ceiling.

Figure 2 is a control circuit diagram of the upper 1,000 enblock. and each L/-113i1141
] Glue race Eve 4-1Iφa for positive phase and negative phase connection
Apply three-phase AC power (R) (S) (T) to each of the above motors 15)K through 'yt2, and apply each switch +61
+71 operation causes the motor (6) to rotate forward and backward to form a loader (31 pieces) to be hoisted or unwound.

Further, a first transformer 481 that detects the current change in the power source (R) (S) (Tl) of the motor (5) due to an increase or decrease in one of the power sources (load σ interposed in the middle of the wiring of Tl), etc.; Electric current m (R) (Sl
If the secondary voltage of the first transformer (J8) rises above the set value when the voltage of (T) drops, the front motor fil
It is provided with a stop circuit a9 that causes the earth to break during the hoisting operation 1 of the load naen (3) by K. During said stop v! IJ91 is a variable resistor that sets the maximum load lifted by the motor (6)K, and turns on when the current of Sl (T) rises above the set value of its resistor 120). It includes an input transformer star to turn on the transformer cl!tl and an output drunk star to turn on the transformer cl!tl in succession.It is approximately the same as the rise value of the secondary side voltage of the first transformer 1181 of 1W. - In preparation for the leakage type second transformer 12311 that generates an increased secondary current, all the secondary sides of the second transformer 1231 are connected in series to the secondary side of the first transformer 1I81, and the primary of the second transformer E+ side is connected to the secondary side of the operating power transformer t151, and a constant power supply (R1 In this case, use the 12 transformer I231 to compensate for the electric current (R) (S) (carve to keep the variable resistor +201 in the specified voltage application state when the voltage rises (current rises) of Tl. .

In addition, the upper P motor (61) is used to interrupt the winding operation of the load engine (31).
The set coil 1251 of □ is connected to the output transistor (2fi
%i*! to reset coil Im f of reversing relay i14). 271, and connect the rising switch +6s (!: limit switch 1) to the 1st place of 111
24 Nori race in Senkan + '2, and the stop circuit and this drive *rAt- transformer for operating power supply applied t1
51 When the load 121 is lifted and the load is set by a fixed load set by a female resistor, the load is set by intervening a dog.
Each relay switch is activated by excitation of the coil
・N thousand g81 tzg1'l off position ti1 and switch to the upper case sui・y 4- +615% Lord naen (
31 is interrupted, while the lowering switch (7N operation excites the reset coil +261 to return each relay switch (c) 29) to the on position 11.

The present invention is constructed as described above, and a load 121 with a maximum load (for example, 1 ton), which is set in advance by the variable resistor 44 in accordance with the stepwise torque of the upper P motor (6), is suspended by the load naen 131K. When lowered, three-phase AC power # (R1(
S) (Tl is specified type EC, for example 200 volts),
As a result of the lift switch 1fi) operation π, the motor 15) rotates in the forward direction to wind up the load naen 131 and raise the load (2) to the desired height. (R) (s) (T) 2 Use other equipment? When operating in parallel, etc. [b, electric m (R) (
S) When (T) drops by a specified value h, the constant power supply (R
) (S) (Voltage rise of Tl (for example, about 20 ports)
The first transformer d81 and the second transformer (23) within the range
Since the phase of the secondary side output of is approximately constant, the first transformer 1
The secondary side voltage drop (secondary side current rise) on the surface is compensated by the secondary side output of the second transformer (231), and the variable resistor 1
If the person is in danger, keep the force at the specified voltage application state, and apply the 0T change under the condition where the voltage drops below the specified range within the range where the sum of the secondary outputs of the first and second transformers AS+SA is approximately constant. The motor (51
Prevents interruption of one work.

On the other hand, a load 12) larger than the maximum cart set in advance for the Or variable resistor 1201'i is suspended from the low r4-en 13) π, and the motor (61?) is rotated forward by operating the lift switch 16). When the hand engine 131' (1- is wound up, the sum of the secondary side outputs of the first and second transformers +lsi +231 becomes excessive, turning on the input quadrant receiver star 1211j, and the output quadrant: 2 star (2 wires). Set the racking relay (1261σ) through the coil I:26+'6 to sensitize 111, then switch each relay of the racking relay (26) to the off position to the off position, and interrupt the hoisting operation of the motor (51) by the raising switch +61K. At the same time, the power input during stop @ 191 applied through the operation 'lt source transformer 11511 is interrupted, and the forward rotation relay 1131 and the set coil 1261t are held off.At this time, the descending switch ty12mF')-Li motor 1+151? Il-Reversal Sase, Low y 4- En 1
Lowering 31? At the same time as the cargo (2) is fully lowered, the lowering switch (7) is operated to activate the latching relay example σ) reset coil 126), which returns each relay switch 4-t281 (29) of the latching relay example to the on position. It is.

As is clear from the above embodiments, the present invention provides a first transformer 11 for detecting a change in the power supply current of an electric motor (5) for hoisting or lowering a low V hand engine 131 for suspending a load.
8+ (!: The secondary voltage of the first transformer J8+ rises above the set value and the ratio becomes negative before the motor tel VC
In a structure that is compatible with the stop circuit J91 that interrupts one winding operation of 31, a secondary current of approximately the same rise as the rise value of the secondary voltage of the first transformer is generated. Bo2 transformer @ secondary 9111kg1 transformer d
The motor L511kW is operated with a set load by connecting it in series to the secondary side of &, and keeping the sum of the secondary side outputs σ) of the first and second transformers tl&EII almost constant within a constant drop range of the electric fIA voltage. For example, if you are using the same power line to build other equipment in parallel with hand enblocking, you should check whether the load is being lifted by the Kinin block or the set maximum load is set to A and the power supply voltage. Even if it rises, it will be 1'
rI motor tel k U recommend Luggage (2) Fully hanging mouth 〒1'' 131 '?!: It can be hoisted, and the inadvertent operation of the stop circuit 19 (#1?) can be prevented. Preventing excessive stoppage of the motor (5) 6, preset L
Is it possible to safely and correctly lift the load on the FC vehicle without affecting the voltage FF1J of the power supply used?
@af! Within the hoisting capacity of the motor 510, it is possible to raise a certain amount of cargo to 1 gram, etc. σ) It shows remarkable results.

[Brief explanation of the drawing]

Is Figure 1 an embodiment of the present invention? An external view of the Mien block shown in Fig. 2 is its control circuit diagram. 〆ゝ(2t...R item, 181...military transformer (31...
・Ro V Sen J91...Stop IEI] M1
51...1ltIIl'I motor -23)...
・Second transformer applicant: Tadashi Fujiwara, agent of Zojirushi Enblock Co., Ltd., 1.
531. 515

Claims (1)

[Claims] The first transformer detects all changes in the electric current of the electric motor that hoists up and lowers the low F hand engine that suspends the load, and when the secondary voltage of the first transformer rises above the set value, In the complete structure and the stop circuit that interrupts all winding operations of the low V engine by the motor, is the secondary current approximately the same as the secondary voltage drop value of the 1irIk first transformer? The secondary side of the second transformer that occurs? The motor is connected in series to the secondary side of the first transformer, and the motor is driven with a set load by substantially constant output of the secondary side of the first and second transformers within a constant drop in power supply voltage. This is a constant load lifting device of Denbo 1,000-ton block which has all the features.