JPS6194999A - Speed controller for electric chain block with electric trolley - 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] [Field of Industrial Application] This invention provides an electric chain block with an electric trolley, in which any one of the electric trolleys or electric chain blocks can be operated independently at a set speed by a control lever. The present invention relates to a speed control device for an electric chain hoist with an electric trolley, which is capable of operating the electric chain hoist at a rated speed and at the same time at a set speed by controlling all trolleys and trolleys.

[Prior art]

For conventional electric chain hoists with electric trolleys,
Since there is no adjustment device for the traveling speed of the electric trolley and the lifting and lowering speed of the electric chain hoist, there is a problem in that the workability of hoisting, hoisting, lowering, and traveling the load is poor.

[Purpose and structure of the invention]

The object of the present invention is to provide a complete speed control device for an electric chain hoist with an electric trolley that can advantageously solve the above-mentioned problems. One inverter 1 is provided in the power supply circuit, the motor 6 of the electric trolley 2 is connected to the power source via the inverter 1, and the motor 5 of the electric chain hoist 4 is connected to the power source via the inverter 1. The control circuit of the electric chain hoist with an electric trolley, which is connected to the power source without the inverter 1, has two states: 1) an independent operation state in which only one of the motors 3 and 5 is energized via the inverter 1; The motor 3 of the electric trolley is energized via the inverter 1, and the motor 5 of the electric chain hoist 4 is connected to the inverter 1.
A switch S1 is provided for switching to a simultaneous operation state in which electricity is supplied without going through the power supply, and a timer T is provided which operates when the electric trolley is decelerated by the inverter 1 to cut off the power to the motor 3 of the electric trolley 2 with a delay. The present invention provides a speed control device for an electric chain hoist with an electric trolley, characterized in that the speed reduction device in the electric chain hoist 4 is provided with a mechanical brake for preventing hanging loads from falling.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an embodiment of the present invention, in which an electric trolley 2 running along a running rail B has a motor 6 consisting of a brake motor, and is suspended by a frame 7 of the movable trolley 2. The supported lifting chain block 4 is equipped with a motor 5 consisting of a brake motor and a mechanical brake for preventing suspended loads from falling, which is provided in a speed reduction device, and a connection box 8 and an inverter 1 are attached to the frame 7. Furthermore, an operation box 10 is connected to the lower end of the operation cape 9 hanging from the connection box 8.
7. .

ing. Further, each of the motors 3 and 5 is configured such that the brake is automatically activated when the power to the motor is cut off, and the brake is automatically released when the motor is connected to the power source. brake motor is used.

To explain the gear reduction device and mechanical brake of the electric chain block 4 with reference to FIGS. 3 and 4, a drive shaft 12 connected to a rotor shaft 11 of a motor 5 is supported by a casing 16 via a bearing, A hollow driven shaft 14 through which the shaft 12 is inserted is rotatably supported by a casing 13 via a bearing, and a load sheave 16 on which a load chain 15 is completely wrapped is integrally provided on the hollow driven shaft 14, and a large diameter A driven gear 17 is fixed.

An intermediate shaft 18 disposed parallel to the drive shaft 12 is rotatably supported by the casing 13 via a bearing, and a small diameter intermediate ringing gear 19 that meshes with the large diameter driven gear 17 is fixed to the intermediate shaft 18. .

The large-diameter intermediate driven gear 21 and the brake tightening disc 22 that mesh with the small-diameter drive gear 20 provided at the end of the drive shaft 12 are screwed together with the brake screw of the intermediate shaft 18, and the large-diameter intermediate driven gear 21 and An annular ratchet wheel 23 and an annular friction plate 24 disposed on both sides thereof are fitted into an annular groove formed by the brake tightening disc 22 and its screws.
Further, a pawl piece 25 that engages with the catch 26 is pivotally attached to the casing 16, and a spring 26 that acts to engage the pawl piece 25 with the ratchet wheel 23 is engaged with the pawl piece 25. The intermediate shaft 18
A large diameter intermediate driven gear 21 and a brake tightening plate 22 are screwed together with the brake screw, a ratchet 26 and a friction plate 24 are interposed between them, and a spring 26 is attached to the ratchet 26
A mechanical brake is constructed by the pawl piece 25 that is engaged by the load chain 15. due to the weight of the suspended load. When the intermediate shaft 18 is rotated through the load sheave 13, the large-diameter driven gear 17, and the small-diameter intermediate driven gear 19, the brake tightening plate 22 screwed into the brake thread of the intermediate shaft 18 is rotated. The large-diameter intermediate driven gear 21 is tightened and moved toward the large-diameter intermediate driven gear 21, and the pawl 2 and the friction plate 24 are pressed together by the IL 21 and the brake tightening plate 22, and are integrated with the pawl 26. is engaged with a claw piece 25 that completely prevents rotation of the suspended load in the falling direction, so a mechanical brake is activated to prevent the suspended load 9 from falling.

7 to 9 show the speed control circuit of an electric chain hoist with an electric trolley, in which the motor 5 of the electric chain hoist is a one-turn soil magnetic contactor MC4.
A contact MCA-a and lowering magnetic contactor MC5
The three-phase power supply R
, S, and T, and is connected to the main circuit output terminals U, V, and W of the inverter 1 via the A contact MC2-a' of the direct magnetic contactor MC2 for powering on the chain block motor, The brake motor 6 of the trolley is connected to the main circuit output terminals U, V, and W of the inverter 1 through the A contact MC3-ak of the electromagnetic contactor MC3 for turning on the trolley motor power, and is further connected to the main circuit power terminals R, , and S of the inverter 1. ,
, T, are connected to three-phase power supplies R, S, and T between the A contacts MCI-a and MCa-a, and are inverter control power terminals & in the inverter 1.

T2 is the power supply R2 before the A contact MCI-a.
Connected to T.

Frequency setting terminals V, , V2v3 in inverter 1
is connected to the speed adjustment OT variable resistor R, and the forward rotation circuit terminal SF of the inverter 1 is connected to the A contact R1-a2 of the inverter control lowering relay R1 and the A contact of the inverter control forward running relay R6. One end of the forward rotation (hoisting, forward running) control circuit (■) consisting of a parallel circuit with R3-a2 is connected, and the A contact R2- of the inverter control lowering relay R2 is connected to the reverse circuit terminal SR of the inverter 1. A2 is connected to one end of the reverse (lowering, backward traveling) control circuit X consisting of a parallel circuit with the A contact R11-a2 of the inverter-controlled backward traveling relay R4, and is further connected to the acceleration/deceleration switching terminal Ta of the inverter 1. is the B contact R5- of the running slow stop relay R5.
One end of the B contact R5 is connected, and the other end of the B contact R5, the other end of the forward rotation control circuit ``,'' the other end of the reverse rotation control circuit X, and the terminal C1 of the inverter 1 are connected to each other. The 1-inverter control power supply terminal R2 of the trench inverter 1 is connected to the abnormality detection common terminal Tc, and the abnormality detection common terminal Tc is connected to the abnormality detection B contact output terminal Tb.

The control circuits of the electric chain hoist with electric trolley include the main circuit power supply circuit I, the operation method switching circuit ■2 hoisting circuit, the 1st hoisting lowering circuit■, and the forward traveling circuit■.

The main circuit power-on circuit I includes a push-button main circuit power switch S2 and a main circuit power-on electromagnetic circuit connected in series. It is composed of a contactor MCI and its main circuit power supply circuit lid power supply,!
T and the abnormality detection B contact output terminal Tb of the inverter 1.

The operation method switching circuit ■ is composed of a switch S for switching between simultaneous operation and independent operation, which is a push button switch connected in series, and a relay R6 for switching the operation method. Push button type winding switch S3
+ Lifting limit switch LSU, inverter-controlled lowering relay R1゜B contact R6-bl of operation method switching relay R6, B of inverter-controlled forward travel relay R6
Contact R3-bl, inverter-controlled reverse travel relay R4
B contact R4-bl, B contact R5-bl of the travel slow stop relay R5, and the above-mentioned R1, R6-bl, R3-bl.
.

It is constituted by a hoisting electromagnetic contactor MC4 connected in parallel to the series circuit of R4-bl and R5-bl, and a series circuit of the A contact R6-al of the operation mode switching relay R6.

The lowering circuit ■ includes a push-button lowering switch S29, a lowering limit limit switch LSD, an inverter-controlled lowering relay R2, and an operation method switching relay R6 connected in series.
B contact R6-b2 and B contacts R3-bl and R1-bl shared with the hoisting circuit.

R5-bl and the above R2, R6-b2, R3-bl
.

It is composed of a lowering electromagnetic contactor MC5 connected in parallel to the series circuit of R4-bl and R5-bl, and a series circuit of the A contact R6-a2 of the operation method switching relay R6,
The hoisting switch S and the hoisting down switch S are configured such that when one is turned on, the other is turned off in conjunction.

Forward travel circuit V td, (forward switch S5 connected to column E+' + inverter-controlled forward travel relay R3
゜B contact R2-b of inverter control hoisting relay R2.

B contact R1-b of the inverter-controlled hoisting relay R1, and the reverse travel circuit (2) is composed of the serially connected reverse switch S15 + inverter-controlled reverse travel relay R4 and the B contact R1-b shared with the forward travel circuit. Contact R2-
The forward switch S and the reverse switch S6 are configured such that when one of them is turned on, the other is turned off in conjunction with the forward switch S and the reverse switch S6.

Chain block motor power-on circuit■ is a series-connected electromagnetic contactor M for power-on the chain block motor.
C2 and the A contact R1-al of the inverter control hoisting L/-R1, and the A contact R2-al of the inverter control hoisting relay R2 connected in parallel to the A contact R1-al.
It is composed of.

The running timer circuit (2) is the A contact R3-al of the inverter-controlled forward running relay R6 connected in series.

B contact T-b of timer relay TR, A contact R4-al of inverter-controlled reverse travel relay R4 connected in parallel to travel slow stop relay R5 and the A contact Rro-a1.
, a first circuit ■-1 consisting of a point Aa R5-al of the running slow stop relay R5 and an electromagnetic contactor MC3 for turning on the trolley motor power connected in parallel to the running slow stop relay R5, and a running circuit connected in series. A contact R of slow stop relay R5
5-a2. B contact R4-b2 of inverter-controlled reverse travel relay R4. B contact R3-b2 of inverter-controlled forward running relay R3. It is composed of a second circuit 'VIII-2 consisting of a timer relay TR, and each circuit ■~■ and ■
-1. (2)-2 is connected to the power line T and the main circuit power terminal R1 of the inverter.

The variable resistor VR for speed adjustment and the push button S for simultaneous operation
, -a and a changeover switch S having a valve button S for independent operation, -bk, a valve button 52-a for powering on, and a push button H for powering off. The power switch S2, the hoisting switch S3, the hoisting switch S4, the forward switch S5, and the reverse switch S6 are provided in the operation box 10 and are connected to the hoisting limit switch LSU and the hoisting limit switch LSU, which have a tongue 52-bl. The limit switch LSD is attached to the main body of the chain 7 block (not shown), and when the limit switch LSD is wound up to a predetermined upper limit, a helical spring placed on the support metal fitting 28 supporting the lower hook 27 is activated. A limit switch LSU for limiting hoisting is activated by a striker 29 consisting of
is operated and the lowering is still lowered to the predetermined lowering limit, the lowering limit limit switch LS is activated by the striker (not shown) attached to the load chain 15.
D is operated.

The B contact R5-b2 of the traveling slack 1 jamming relay R5 is an acceleration/deceleration switching contact, and when this contact R5-b2 is on, the acceleration/deceleration of the motor 5 of the electric chain hoist is set, and the acceleration/deceleration is not yet set. When the contact R5-b2 is off, the acceleration/deceleration of the motor 6 of the electric trolley is set. The abnormality detection B contact output terminal Tb in the inverter is turned off when an abnormality occurs.

Next, the operation of the speed control circuit will be explained.

First, press the main circuit power switch S2? When the button 52-a is pressed to turn on the power switch 82, the main circuit power-on magnetic contactor MCI is energized, and the A contact MC1-a of the magnetic contactor MC1 is turned off, thereby turning on the power to the inverter 1. be done.

Next, press the individual operation pushbuttons s and -bl of the simultaneous operation and individual operation changeover switch S1 to switch the changeover switch Sat.
When the hoisting switch 83 is pressed and turned on in the OFF state, the inverter-controlled hoisting relay R1 is energized, and the in/out side winding in the forward traveling circuit (■) and the reverse traveling circuit (■) is activated. Since the B contact R1-b of the upper relay R1 is turned off, the electric trolley can run forward and backward. On the other hand, the A of the inverter-controlled hoisting relay R1 in the chain block motor power supply circuit (■) is turned off.
Contact -R1-al is turned on, electromagnetic contactor MC2 for powering on the chain hoist motor is energized, and A contact MC2-a of the electromagnetic contactor MC2 is turned on.
At the same time, the A contact R1-a2 of the inverter control hoisting relay R1 in the forward side overturning circuit (2) of the inverter 1 is turned on, so power is applied to the motor 5 of the electric chain hoist via the inverter 1, and the motor 5 rotates forward,
The electric chain hoist is hoisted.

In addition, when the changeover switch 81 is in an independent operation state, that is, in a state where it is turned off, and the lowering switch 84 k is pressed to turn on, the inverter control lowering relay R2 is energized.
Since the B contact R2-b of the inverter-controlled lowering relay R2 in the forward traveling circuit V and the backward traveling circuit ■ is turned off, the electric trolley IJ-i cannot be driven forward or backward, and on the other hand, the chain block motor A of inverter control lowering relay R2 in power supply circuit ■
The contact R2-al turns on and the electromagnetic contactor MC2 for powering on the chain hoist motor is energized, the A contact of the electromagnetic contactor MC2 turns on, and the inverter 1
Since the A contact R2-R2 of the inverter-controlled hoisting relay R2 in the reversal control circuit The electric chain hoist is lowered.

Next, with the changeover switch S1 in the fully independent operation state, that is, in the off state, when the forward switch S is pressed to turn on, the inverter-controlled forward travel relay R6 is energized, and the hoisting circuit (■) and the lowering circuit (■) are Said relay R5
Since the B contact R3-bl is turned off, the electric chain hoist cannot be hoisted or hoisted even if the hoisting switch S3 and the hoisting switch S4 are fully pressed.

On the other hand, when the inverter-controlled forward running relay R3 is energized, the A contact R3-al of the relay R3 in the running timer circuit
5 and the trolley motor power-on magnetic contactor MC3 are excited, and the A contact R5-a 1 of the relay R5,
When R5-R2 is turned on and its A contact R5-al is turned on, the first circuit of the running timer circuit -
1 is self-held, and the hoisting circuit ■ and the lowering circuit ■
The B contact R5-bl of the relay R5 is turned off, and the two OBmAR3-bl and R5-bl. Oh, Yuyo. It is intercocked twice to prevent it from being hoisted up or down.

Furthermore, at the same time that the A contact MC3-a of the electromagnetic contactor MC3 for turning on the trolley motor power is turned on, the A contact R3-R2 of the inverter control advance relay R6 in the forward rotation control circuit (■) of the inverter 1 is turned on. Power is applied to the motor 6 of the electric trolley through the , the motor 6 rotates forward, and the electric trolley moves forward.

Next, when the forward switch S is turned off, the inverter-controlled forward travel relay R3 is demagnetized, and the B contact R3-b of the relay R6 in the hoisting circuit ■ and the lowering circuit ■
l is turned on, but the B contact R5-bl of relay R5 in the hoisting circuit ■ and lowering circuit ■ remains off, so the electric chain hoist can be hoisted and hoisted. It is not possible.

On the other hand, when the inverter-controlled forward travel relay R5 is demagnetized, the B contact R3-b2 of the relay R6 in the second circuit close-2 of the travel timer circuit is turned on, and the timer relay TR is energized (timer starts operating), and at the same time, the relay R in the forward rotation control circuit (2) of the inverter 1
A contacts R3-R2 of No. 6 are turned off, and deceleration of the motor 3 in the electric trolley is started.

After a certain period of time, which is the timer setting time, the timer relay T
Since the B contact T-b of R is turned off and the traveling slow stop relay R5 and the magnetic contactor MC3 for turning on the trolley motor power are demagnetized, the B of the relay R5 in the hoisting circuit ■ and the lowering circuit ■ The contact R5-bl turns on, and at the same time, the A contact R5-al of the relay R5 in the first circuit ■-1 and the second circuit ■ of the running timer circuit turns on.
.

When R5-R2 is turned off, the magnetic contactor MC3
Due to demagnetization, the A contact MC3- of the magnetic contactor MC3
a is turned off, and the power to the motor 6 is cut off.

Note that after the forward switch S is completely turned off, the motor 6 is decelerated and stopped within the time set by the timer.

Next, with the changeover switch 81 in the independent operation state, that is, in the off state, when the reverse switch 36k is pressed and turned on, the inverter-controlled reverse travel relay R4 is energized, and the Relay R
Since the B contacts R and 1-bl of No. 4 are turned off, even if the hoisting switch S3 and the hoisting switch 84 are pressed, the electric chain hoist cannot be hoisted or hoisted.

On the other hand, when the inverter-controlled reverse running relay R4 is energized, the A contact R4-al of the relay R4 in the running timer circuit (3) is turned on, so the slow running stop relay R
5 and the trolley motor power-on magnetic contactor MC3 are excited, and the A contact R5-a 1 of the relay R5,
When R5-a2 is turned on and its A contact R5-al is turned on, the first circuit of the travel timer circuit -
1 is self-held, and the hoisting circuit ■ and the lowering circuit ■
The B contact R5-bl of the relay R5 is turned off, and the two B contacts R3-bl and R5-bl are turned off (doubly interlocked to prevent winding up and down.

Also, at the same time that the A contact M C3-a of the electromagnetic contactor M C3 for turning on the trolley motor power is turned on, the inverter control reversing relay R in the inverter reversing control circuit X is turned on.
Since the A contact point RA-a2 of No. 4 is turned on, power is applied to the motor 3 of the electric trolley via the inverter, the motor 3 rotates in the reverse direction, and the electric trolley moves backward.

Next, when the reverse switch S6 is turned off, the inverter-controlled reverse travel relay R4 is demagnetized, and the B contact R4-b of the relay R4 in the hoisting circuit ■ and the lowering circuit ■
l is turned on, but the B contact R5-bl of relay R5 in the hoisting circuit ■ and lowering circuit ■ remains off, so the electric chain hoist can be hoisted and hoisted. It is not possible.

On the other hand, when the inverter-controlled reverse travel relay R4 is demagnetized, the B contact RA-b2 of the relay R4 in the second circuit -2 of the travel timer circuit is turned on, and the timer relay TR is energized (timer (starts operation), and the inverter reversal control circuit
A contact RA-a2 of the relay R4 is turned off, and deceleration of the motor 3 in the electric trolley is started.

After a certain period of time, which is the timer setting time, the timer relay T
R's B contact T-b is turned off, and relay R5 for slow stop and trolley motor power-on electromagnetic contactor iVf is turned off.
Since C3 is demagnetized, the B contact R5-bl of the relay R5 in the hoisting circuit (2) and the lowering circuit (2) is turned on, and at the same time.

A contact R5-al of the relay R5 in the first circuit (1)-1 and the second circuit (2) of the running timer circuit.

When R5-a2 is turned off, the magnetic contactor MC3
By demagnetizing the A contact MC of the magnetic contactor IVI C3
3-a is turned off, and the power to the motor 6 is cut off.

Note that after turning off the reverse switch Sak, the motor 6 is decelerated and stopped within the time set by the timer.

Next, a push button S for simultaneous operation of the changeover switch.

When -a f is pressed to turn on the changeover switch 81, the operation method changeover relay R6 is energized, and the A contacts R6-a1 and R6-a2 of the relay R6 are turned on, as well as R6-bl and R6-b2. is turned off.

In this state, when the hoisting switch 83 is pressed to turn on, the A contact MCa-a of the hoisting magnetic contactor MC4 in the hoisting circuit The electric chain hoist is hoisted and the electric chain hoist is hoisted.

In addition, when the changeover switch S+t=ON is pressed and turned on by pressing the 1st hoisting lower switch S, tk, the A contact MC5-a of the hoisting magnetic contactor MC5 in the hoisting circuit ■ is turned on, so the electric chain hoist The motor 5 in is directly powered on without going through the inverter 1, and the electric chain hoist is hoisted.

When the changeover switch S is still fully turned on, that is, when it is switched to simultaneous operation, the B contact R6 in the hoisting circuit ■
-bl and the B contacts R6-b2 in the lowering circuit 1■ are off, and the relays R1 and R2 are not energized. B contact R1-b, R2
-b is held in the off state, as mentioned above, by turning on and off the forward switch S or the reverse switch Sa'r, the electric trolley moves forward and stops, and moves backward and stops. can be made to do so.

FIG. 10 shows the relationship between time and motor operating state when hoisting and hoisting operations are performed under full inverter control of the motor of an electric chain hoist, and at point A, the hoisting switch S3e When turned on, the inverter's output increases gradually, and at the end of the dead time the inverter's output is generated, and at this point B, the motor starts and the inverter's output increases (for example, from 60Hz to 50Hz). Acceleration is performed, and at the end of the acceleration time C, hoisting operation begins at the speed set by the speed adjusting variable resistor.

At the next point, the hoisting switch Sak is turned off, and after a pause time t3 of several seconds, the hoisting switch 84 is turned off.
When the hoisting switch 83 is turned on, the moment the hoisting switch 83 is turned off, the motor's brake is activated to stop the motor's hoisting operation, and the mechanical brake of the electric chain hoist is activated. The inverter output is generated at time E when the pause time and dead time t2 have ended, and the motor starts at this time E, and the inverter output increases to perform acceleration, and the acceleration time ends at time F.
Then, lowering operation begins at the speed set by the speed adjustment variable resistor.

When the lowering switch S4'e is turned off at the next time point G, the brake of the motor is immediately activated to stop the lowering operation of the motor, and the mechanical brake of the electric chain hoist is activated.

FIG. 11 shows the relationship between time and motor operating state when the motor of the electric trolley is operated under inverter control. At time A, the forward switch S or reverse switch S6t is turned on.

, the output of the inverter gradually increases, and the dead time t.

At time B, when the inverter output reaches approximately 5 Hz, the motor starts at time B, and the inverter output increases (for example, from 60 Hz to 50 Hz) to perform acceleration. At C, the vehicle begins running at the speed set by the variable resistor for speed adjustment.

When the forward switch s5 or the backward switch 36 is turned off at the next point, the blade of the inverter becomes 6, for example.
It gradually decreases from 0Hz or 50Hz, so
The motor is decelerated, and at time E, the inverter output becomes about 5 Hz, the motor brake is activated, and the motor rotation is stopped. Next, the timer setting time t
At the time point F when 3 is reached, the motor power supply circuit is cut off.

When carrying out the present invention, a mechanical brake of an electric chain hoist may have an arbitrary structure other than that shown in the drawings. Further, as a changeover switch, all two-stage push-button operation switches may be used, and when the second stage is pressed, the lifting/lowering by the electric chain hoist may be switched to the rated speed (direct control without using an inverter). Furthermore, the operation box 10 may be provided with a speed setting variable resistor corresponding to each motor 3, 5, and the motor may be configured to be switched to direct control when the variable resistor is set to the highest speed. .

As the motors 3 and 5, a brake motor is not used, but a motor without a built-in brake and an electromagnetic brake independent of the motor are used, and the electromagnetic brake is controlled to operate in conjunction with the rotation of the motor. You may.

〔Effect of the invention〕

According to this invention, by simply switching the changeover switch S1, the electric chain hoist 4 with two electric trolleys can be operated independently via one inverter 1;
An electric chain hoist with an electric trolley that can be switched to a simultaneous operating state of operation of the electric trolley 2 via the inverter 1 and operation of the electric chain lock 4 not via the inverter 1, and can therefore be operated in various states at a low cost. Since it is equipped with a timer relay TR that operates when the electric trolley is decelerated by the inverter 1 and delays the power supply to the motor 3 of the electric trolley 2, the electric trolley 2 can be slowed down without forcibly braking. can be stopped, thereby improving safety. Furthermore, since the reduction gear in the electric chain hoist 4 is equipped with a mechanical brake to prevent the suspended load from falling, it is possible to eliminate the possibility that the suspended load will fall during the dead time at the start of the lift during inverter control. The effect of this can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of an electric chain hoist with an electric trolley, Fig. 2 is a side view thereof, and Fig. 6 is a partially vertical side view of the electric chain hoist. Figure 4 is a vertical side view of the mechanical brake, Figure 5
The figure is a longitudinal front view showing a part of the mechanical brake, Figure 6 is a front view of the operation box, Figure 7 is a diagram showing the speed control circuit of the electric chain hoist with electric trolley, and Figure 8 is the speed control circuit. A diagram showing an enlarged view of the power supply control circuit in
FIG. 9 is an enlarged view showing the vicinity of the inverter in the speed control circuit. FIG. 10 is a diagram showing the relationship between time and motor operating state when the motor of the chain hoist is hoisted and hoisted down under inverter control. FIG. 11 is a diagram showing the relationship between time and motor operating state when the motor of the electric trolley is operated under inverter control. In the figure, 1 is an inverter, 2 is an electric trolley, 6 is a motor, 4 is an electric chain hoist, 5 is a mop, 6 is a running rail, 7 is a frame, 10 is an operation box, 1
2 is a drive shaft, 14 is a hollow driven shaft, 15 is a load chain 7
．． 16 is a load sheave, 17 is a large diameter driven gear, 18 is an intermediate shaft, 19 is a small diameter intermediate drive gear, 20 is a small diameter drive gear,
21 is a large diameter intermediate driven gear, 22 is a brake tightening board, 2'
5 is a ratchet wheel, 24 is a friction plate, 25 is a claw piece, SL is a changeover switch for switching between simultaneous and individual operation, S3 is a hoisting switch,
S. is for volume 1 74"/f・8・ is forward f@, L4-) f・8
・Rear - overload switch, TR is timer relay, VR
Written amendment to speed procedure (voluntary) August 27, 1985

Claims (1)

[Claims] One inverter 1 is provided in the power supply circuit of the electric chain hoist with an electric trolley, the motor 3 of the electric trolley 2 is connected to the power source via the inverter 1, and the motor 5 of the electric chain hoist 4 is connected to the power source via the inverter 1. The control circuit of the electric chain hoist with an electric trolley includes an independent motor that energizes only one of the motors 3 and 5 via the inverter 1. A changeover switch S_1 is provided for switching between the operating state and a simultaneous operating state in which the motor 3 of the electric trolley is energized via the inverter 1 and the motor 5 of the electric chain hoist 4 is energized not via the inverter 1. A tire T is provided which operates when the electric trolley is decelerated by the inverter 1 to cut off the power supply of the motor 3 of the electric trolley 2 in a delayed manner, and a mechanical brake for preventing suspended loads from falling is provided in the speed reduction device of the electric chain hoist 4. A speed control device for an electric chain hoist with an electric trolley, which is characterized by: