JPH0259120B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the lifting speed of an electric chain block, the traversing speed of an electric trolley equipped with an electric chain block, and the traveling speed of a traversing rail in a crane equipped with an electric chain block. The present invention relates to a device for controlling a computer.

[Prior art]

Conventionally, as a speed control device for a crane having an electric chain block, a speed control inverter is provided in each of the power circuit of the electric chain block, the power circuit of the electric trolley, and the power circuit of the drive device for traveling the traversing rail. is known (for example, see Japanese Patent Laid-Open No. 113093/1983), and it is also possible to use one inverter for controlling the lifting speed of the electric chain block, the traversing speed of the electric trolley, and the traveling speed of the traversing rail. There are also known configurations (see, for example, Utility Model Application Publication No. 161972/1983).

However, in the former case, three inverters are required, resulting in high costs, and in the latter case, inverter control in multiple directions cannot be performed at the same time, which is inconvenient for crane operation.

[Purpose and structure of the invention]

The object of the present invention is to provide a speed control device for a crane having an electric chain block that can advantageously solve the above-mentioned problems. In a crane having an electric chain block, the electric chain block is installed on a traversing rail 2 provided with a traveling drive device 1 so as to be traversable, and the traversing rail 2 is installed on a traversing rail 3 so as to be traversable. One inverter 4A is provided in the power supply circuit of the electric trolley, the motor 6 of the electric trolley 5 is connected to the power supply via the inverter 4A, and the motor 8 of the electric chain block 7 is connected to the power supply via the inverter 4A. The control circuit of the electric trolley with an electric chain block includes an independent motor that energizes only one of the motors 6 and 8 via the inverter 4A. A changeover switch _S1 is provided for switching between the operating state and a simultaneous operating state in which the motor 6 of the electric trolley is energized via the inverter 4A and the motor 8 of the electric chain block 7 is energized not via the inverter 4A. In addition, a timer circuit is provided which operates when the electric trolley is decelerated by the inverter 4A and delays the power supply of the motor 6 of the electric trolley 5 to be cut off. 4B, the control circuit of the traveling drive device 1 includes a traveling direction switching circuit and a timer that is activated when the traversing rail is decelerated by the inverter 4B to delay and cut off the power to the motor of the traveling drive device. circuit, and the inverter 4B
A speed control device for a crane having an electric chain block, characterized in that a traveling drive device control unit comprising a control circuit for the traveling drive device 1 and a control circuit for the traveling drive device 1 is independent from a control circuit for the electric trolley with the electric chain block. It is in.

〔Example〕

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

The drawing shows an embodiment of the present invention, in which wheels 11 of an electric trolley 5 equipped with a traverse drive device 10 are mounted on a traverse rail 2 extending in the left-right direction (left-right direction in FIG. 1). The electric chain block 7 mounted thereon has a motor 6 consisting of a brake motor and a speed reducer, and is suspended and supported by the frame 12 of the electric trolley 5. 8, a load sheave 12 rotated by the motor 8 via a speed reduction device, a mechanical brake provided on the speed reduction device to prevent suspended loads from falling, and a load chain 14 wound around the load sheave 13. A lower hook 16 is attached to the end via a support fitting 15.

A control circuit storage box 17 and an inverter 4A are attached to the frame 12, and an operation box 19 is connected to the lower end of an operation cable 18 hanging from the control circuit storage box 17. There are running wheels 2 on both left and right ends.
0, a motor 9 consisting of a motor with a brake, and a traveling drive device 1 consisting of a reduction gear 21 are attached.

The inverter 4B is fixed to the traversing rail 2, and the running wheels 20 are placed on the lower flange of a running rail 3 extending in the front-rear direction, and the running rail 3 is attached directly or indirectly to a beam of a building, etc. Fixed. Further, the motors 6, 8, and 9 are configured so that the brakes are automatically activated when the power to the motors is cut off, and the brakes are automatically released when the motors are connected to the power source. A known brake motor is used.

The gear reduction device and mechanical brake of the electric chain block 7 will be explained with reference to FIGS. 4 to 6. A drive shaft 23 connected to a rotor shaft 22 of a motor 8 is supported by a casing 24 via a bearing. A hollow driven shaft 25 that has passed through the drive shaft 23 is rotatably supported by a casing 24 via a bearing, and a load sheave 13 around which a load chain 14 is wound is integrally provided on the hollow driven shaft 25. , a large diameter driven gear 26 is fixed.

An intermediate shaft 27 arranged parallel to the drive shaft 23
is rotatably supported by a casing 24 via a bearing, a small diameter intermediate drive gear 28 that meshes with the large diameter driven gear 26 is fixed to the intermediate shaft 27, and a small diameter drive gear provided at the end of the drive shaft 23. A large-diameter intermediate driven gear 30 and a brake tightening disk 31 that mesh with the gear 29 are screwed together with the brake screw of the intermediate shaft 27, and are further formed by the large-diameter intermediate driven gear 30, the brake tightening disk 31, and their bosses. An annular ratchet wheel 32 and an annular friction plate 33 disposed on both sides thereof are fitted into the annular groove, and a claw piece 34 that engages with the ratchet wheel 32 is pivotally attached to the casing 24. is engaged with a spring 35 which acts to engage the ratchet wheel 32.

A large-diameter intermediate driven gear 30 and a brake tightening plate 31 are screwed onto the brake screw of the intermediate shaft 27.
A mechanical brake is constituted by a ratchet wheel 32 and a friction plate 33 interposed between them, and a pawl piece 34 that is engaged with the ratchet wheel 32 by a spring 35. chain 1
4. When the intermediate shaft 27 is rotated by a certain angle via the load sheave 13, the large-diameter driven gear 26, and the small-diameter intermediate drive gear 28, the brake tightening disc 31 is screwed onto the brake screw of the intermediate shaft 27. is tightened and moved toward the large-diameter intermediate driven gear 30, and the ratchet wheel 32 and friction plate 33 are gripped and integrated by the large-diameter intermediate driven gear 30 and the brake tightening disc 31,
In addition, since a claw piece 34 that prevents rotation of the suspended load in the falling direction is engaged with the ratchet wheel 32, a mechanical brake is activated to prevent the suspended load from falling.

Figures 8 to 12 show the speed control circuit of the electric trolley with electric chain block and the traversing rail. First, the speed control circuit of the electric trolley with electric chain block will be explained.
However, the A contact MC4-a of the hoisting magnetic contactor MC4
and A contact MC5- of the lowering magnetic contactor MC5
a and magnetic contactor MC for powering on the inverter main circuit
1 A contact MC1-a and the three-phase power line R,
A contact MC2 of the electromagnetic contactor MC2 for powering on the chain block motor is connected to S and T.
-a is connected to the main circuit output terminals U, V, W of the inverter 4A, and the brake motor 6 of the electric trolley is connected to an electromagnetic contactor for turning on the power of the trolley motor.
Inverter 4 via A contact MC3-a of MC3
It is connected to the main circuit output terminals U, V, W of inverter 4A, and is further connected to the main circuit power terminals R ₁ , S ₁ , T ₁ of inverter 4A.
is connected to the three-phase power supply lines R, S, and T between the A contacts MC1-a and MC4-a, and is also an inverter control power terminal in the inverter 4A.
R ₂ and T ₂ are connected to the power lines R and T between the A contacts MC1-a and MC4-a.

Frequency setting terminal V ₁ in inverter 4A,
V ₂ and V ₃ are connected to the speed adjustment variable resistor VR1, and the normal rotation circuit terminal SF of the inverter 4A is connected to the
A contact R1- of inverter control hoisting relay R1
a2 and A of inverter controlled forward and traverse relay R3
One end of the normal rotation (hoisting, forward traverse) control circuit consisting of a parallel circuit with contact R3-a2 is connected,
The reverse circuit terminal SR of the inverter 4A has an A contact R2-a2 of the inverter control lowering relay R2 and an A contact R of the inverter control reverse traverse relay R4.
4-a2 is connected to one end of the reverse (lowering, backward traverse) control circuit consisting of a parallel circuit, and the B contact R5- of the traverse slow stop relay R5 is connected to the acceleration/deceleration switching terminal Ta of the inverter 4A. One end of b2 is connected, and the other end of the B contact R5-b2, the other end of the forward rotation control circuit, the other end of the reverse rotation control circuit, and the terminal C1 of the inverter 4A are connected to each other. . Further, the inverter control power supply terminal _R2 of the inverter 4A 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 circuit of an electric trolley with an electric chain block consists of a main circuit power supply circuit, an operation method switching circuit, a hoisting circuit, a lowering circuit, a forward traverse circuit,
It has a reverse traverse circuit, a chain block motor power-on circuit, and a running timer circuit, and the main circuit power-on circuit includes a series-connected push button type main circuit power switch _S2 and a main circuit power-on magnetic contactor MC1. The main circuit power-on circuit is connected to the power line T and the abnormality detection B contact output terminal Tb of the inverter 4A.

The operation mode switching circuit is composed of a simultaneous operation/single operation switching switch _S1 consisting of a push button switch connected in series, and an operation mode switching relay R6, and the hoisting circuit is composed of a push button switch connected in series. Hoisting switch _S3 , hoisting control limit switch LSU, inverter control hoisting relay R1,
A contact R6-a1 of operation method switching relay R6,
B contact R of inverter controlled forward/traverse relay R3
3-b1, inverter controlled reverse traverse relay R4
an inverter control circuit consisting of the B contact R4-b1 of the running slow stop relay R5, the B contact R5-b1 of the travel slow stop relay R5, the limit switch LSU and the relay R
1 and a power source R, and a direct control circuit consisting of a hoisting electromagnetic contactor MC4 and a B contact R6-a1 of an operation mode switching relay R6.

The lowering circuit consists of a push-button lowering switch S ₄ and a lowering limit limit switch connected in series.
LSD, inverter control lowering relay R2, operation mode switching relay R6's A contact R6-a2, and B contacts R3-b1, R4- shared with the hoisting circuit.
b1, R5-b1, the limit switch LSD and relay R
B of the lowering magnetic contactor MC5 and the operation method switching relay R6 connected in series between 2 and the power supply R.
It is composed of a direct control circuit consisting of contacts R6-b2, and the hoisting switch _S3 and the hoisting down switch
_S4 is configured so that when one is turned on, the other is turned off in conjunction.

The forward traverse circuit includes a forward traverse switch S ₅ connected in series, and an inverter-controlled forward traverse relay R.
3. B contact R of inverter control lowering relay R2
2-b, the B contact R1-b of the inverter-controlled hoisting relay R1, and the reverse traverse circuit includes a reverse traverse switch S ₆ connected in series,
Inverter-controlled backward traverse relay R4 and B contacts R2-b and R1-b shared with the forward traverse circuit
The forward traversing switch _S5 and the backward traversing switch _S6 are configured such that when one is turned on, the other is turned off in conjunction.

The chain block motor power-on circuit consists of A-contacts R1-a1 of the chain-block motor power-on electromagnetic contactor MC2 and inverter control hoisting relay R1 connected in series, and the A-contact R.
1-a1 and A contact R2-a1 of the inverter control lowering relay R2 connected in parallel to the inverter control lowering relay R2.

The traverse timer circuit has an A contact R3-a of an inverter-controlled forward traverse relay R3 connected in series.
1. B contact T1-b of timer relay T1, A contact R4-a1 of inverter-controlled reverse traverse relay R4 connected in parallel to traverse slow stop relay R5 and the A contact R3-a1, traverse slow stop relay R4. A contact R5-a1 of relay R5 and relay R for slow traverse stop
A contact R5-a2 of the trolley motor power-on electromagnetic contactor MC3 connected in parallel to the trolley motor power-on relay R5 connected in series, and the A contact R5-a2 of the inverter-controlled reverse traverse relay R4 connected in series. The second circuit 2 includes a B contact R4-b2, a B contact R3-b2 of the inverter-controlled forward/traverse relay R3, and a timer relay T1.

The circuit is connected to the power supply lines R and T, and the circuit, the circuit, and the inverter control circuit, the circuit, and the circuit are connected to the power supply line T and the inverter 4.
It is connected to the abnormality detection B contact output terminal Tb of a,
The circuit includes a power line T, an A contact MC1a and
It is connected to the power line R between MC4-a.

The limit switch LSU for limiting hoisting and the limit switch LSD for limiting hoisting are attached to the chain block body (not shown), and when the chain block is hoisted to a predetermined upper limit, the lower hook 1
When the hoisting limit switch LSU is operated by the striker 36 made of a helical spring mounted on the support metal fitting 15 supporting the load chain 14, and when the hoisting limit switch LSU is lowered to a predetermined hoisting limit, the load chain 14 is A limit switch for limiting lowering is activated by the attached striker (not shown).
LSD is manipulated.

B contact R5-b of the traverse slow stop relay R5
2 is a contact for switching acceleration/deceleration, and this contact R5-
When b2 is on, the acceleration/deceleration of the motor 8 of the electric chain block is set, and its contact R5-b
When 2 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, to explain the speed control circuit of the traversing rail 2, the motor 9 in the traversing drive device 1 is connected to the A contact MC7-
main circuit output terminal U of inverter 4B via a,
V, W, and the main circuit power terminals R ₁ , S ₁ , T ₁ of the inverter 4B are connected to the three-phase power lines R, S via the A contact MC6-a of the magnetic contactor MC6 for turning on the inverter main circuit power. , T, and further connected to the inverter control power supply terminal R ₂ in the inverter 4B,
_T2 is connected to the main circuit power terminals _R1 and _T1 .

The speed changeover switch R9-S controlled by the speed changeover relay R9 has two sets of switching contacts, and the first and second frequency setting terminals V ₁ and V ₂ in the inverter 4B are connected to the speed changeover switch R9-S.
The movable terminal of the speed changeover switch R9-S is connected to the common terminals _C1 and _C2 in S, and the movable terminal of the speed changeover switch R9-S is connected to the speed changeover switch R9 connected to the low speed setting resistor VR2 when the speed changeover relay R9 is not energized. −
Speed changeover switch R9-S is connected to B contact terminals b1 and b2 of S, and connected to high speed setting resistor VR3 when speed changeover relay R9 is energized.
The other terminal of each resistor VR2, VR3 is connected to the A contact terminal a1, a2 of the inverter 4.
It is connected to the third frequency setting terminal _V3 at B.

A contact R7-a2 of the inverter-controlled forward running relay R7 is connected to the forward rotation circuit terminal SF of the inverter 4B.
One end is connected to the reverse circuit terminal SR of the inverter 4B, and one end of the A contact R8-a2 of the inverter-controlled backward running relay R8 is connected to the reverse circuit terminal SR of the inverter 4B.
The other ends of each of the A contacts R7-a and R8-a are connected to the terminal C1 of the inverter 4B. Further, the inverter control power supply terminal _R2 of the inverter 4B is connected to the abnormality detection common terminal Tc, and the abnormality detection common terminal Tc is connected to the abnormality terminal B contact output terminal Tb.

The control circuit of the traveling drive device includes a low-speed forward traveling circuit XI, a high-speed forward traveling circuit XII, a low-speed reverse traveling circuit, a high-speed reverse traveling circuit, and a traveling timer circuit, and the low-speed forward traveling circuit XI is a two-stage push forward traveling circuit. 1st stage contact S ₇ − in drive switch S ₇
B contact R8- of L, inverter-controlled forward traveling relay R7, and inverter-controlled backward traveling relay R8
The high-speed forward traveling circuit XII is configured by a series circuit with the two-stage push forward traveling switch _S
It is constituted by a series circuit of the second stage contact S7 _- H and the speed switching relay R9.

The low-speed reverse travel circuit includes a first stage contact S ₈ -L of the two-stage press-type reverse travel switch S ₈ , an inverter-controlled reverse travel relay R8, and a B contact R7-b of the inverter-controlled forward travel relay R7. The high-speed reverse running circuit is composed of a series circuit of the second stage contact S ₈ -H of the two-stage push type forward running switch S ₈ and the speed switching relay R9.

The running timer circuit is connected to the A contact R7- of the inverter-controlled forward running relay R7 connected in series.
a1, B contact T2-b of timer relay T2, A contact R8-a1 of inverter-controlled reverse travel relay R8 connected in parallel to relay R10 for slow stop of travel and the A contact R7-a1, for slow stop of travel The first circuit-1 consists of the A contact R10-a1 of the relay R10 and the electromagnetic contactor MC7 for turning on the power of the travel drive device motor connected in parallel to the travel slow stop relay R10, and the travel slow stop relay connected in series. A contact R10-a2 of relay R10, B contact R7-b of inverter-controlled forward running relay R7
2. The second circuit 2 is composed of the B contact R8-b2 of the inverter-controlled reverse travel relay R8 and the timer relay T2.

Each of the circuits XI~ is a power line T and an inverter 4B.
The inverter 4 is connected to the abnormality detection B contact output terminal Tb of the main circuit power supply circuit.
Inverter 4B in parallel with magnetic contactor MC1 for A
When the electromagnetic contactor MC6 is connected and the power switch _S2 of the main circuit power-on circuit is turned on, power is applied to each inverter 4A, 4B.

The operation box 19 includes a variable resistor VR1 for speed adjustment, a push button S 1 -a for simultaneous operation and a push button S _{1 -b} for simultaneous operation of the changeover switch S ₁ for switching between simultaneous operation and independent operation, and a main circuit. Power-on push button S ₂ -a and power-off push button of power switch S ₂
S ₂ -b and each of the switches S ₃ to _{S 8} are provided,
The low speed setting resistor VR2 and the high speed setting resistor VR3 are provided in the case of the inverter 4B, and the low speed setting resistor VR2 sets the low speed value of the motor 9 of the traveling drive device. At the same time, the high speed of the motor 9 of the traveling drive device is set by the high speed setting resistor VR3.

Note that the switches _S7 and _S8 are of an interlocking type in which when one is turned on, the other is automatically turned off.

Also, the speed control circuit for the electric trolley with electric chain block (excluding the switch) and the speed control circuit for the traveling drive device (excluding the switch)
Manufactured as a separate and independent unit.

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

First, push button S ₂ -a of main circuit power switch S ₂
When you press the power switch _S2 to turn on, the magnetic contactors MC1 and MC6 for turning on the main circuit power are excited, and the A of those magnetic contactors MC1 and MC6 is turned on.
Since contacts MC1-a and MC6-a are turned on, power is supplied to inverters 4A and 4B.

Next, press the independent operation pushbutton _S1 -b of the simultaneous operation and individual operation changeover switch _S1 to turn on the changeover switch _S1 , and then press the hoisting switch _S3 to turn on the inverter control. Since the hoisting relay R1 is energized and the B contact R1-b of the inverter-controlled hoisting relay R1 in the forward traversing circuit and the backward traversing circuit is turned off, the electric trolley cannot be traversed forward or backward. , On the other hand, A of the inverter control hoisting relay R1 in the chain block motor power supply circuit.
Contact R1-a1 is turned on, electromagnetic contactor MC2 for powering on the chain block motor is excited, A contact MC2-a of electromagnetic contactor MC2 is turned on, and the inverter in the forward rotation control circuit of inverter 4A is turned on. A of control hoisting relay R1
Contact R1-a2 turns on, so inverter 4
Power is applied to the motor 8 of the electric chain block through A, the motor 8 rotates forward, and the electric chain block is hoisted.

In addition, when the changeover switch _S1 is in an individual operation state, that is, turned on, and the lowering switch _S4 is pressed to turn on, the inverter control lowering relay R2
is excited, and the B contact R2-b of the inverter-controlled lowering relay R2 in the forward traverse circuit and the reverse traverse circuit is turned off, so the electric trolley cannot be traversed forward or backward; A contact R of inverter control lowering relay R2 in the motor power supply circuit
2-a1 is turned on, the chain block motor power-on magnetic contactor MC2 is energized, the A contact of the magnetic contactor MC2 is turned on, and the inverter control lowering relay in the reverse control circuit of the inverter 4A is activated. Since the A contact R2-a2 of R2 is turned on, power is applied to the motor 8 of the electric chain block via the inverter 4A, the motor 8 is reversed, and the electric chain block is driven down.

Next, with the changeover switch _S1 in the independent operation state, that is, in the ON state, when the forward traverse switch _S5 is pressed and turned on, the inverter-controlled forward traverse relay R3 is energized, and the hoisting circuit and the lowering circuit are activated. B contact R3-b1 of the relay R3
is turned off, the electric chain block cannot be hoisted or hoisted even if hoisting switch _S3 and hoisting switch _S4 are pressed.

On the other hand, when the inverter-controlled forward and traverse relay R3 is excited, the A contact R3-a1 of the relay R3 in the traverse timer circuit is turned on.
Relay R5 for traversing slow stop and electromagnetic contactor MC3 for trolley motor power supply are energized, and the A contacts R5-a1 and R5-a2 of relay R5 are turned on, and the A contact R5-a1 is turned on. Therefore, the first circuit-1 of the traverse timer circuit is self-held, and furthermore, the B contact R5-a1 of the relay R5 in the hoisting circuit and the hoisting circuit is turned off, and the two B contacts R3-b1, R5- b1
2 to prevent hoisting and lowering due to turning off.
heavily interlocked.

In addition, the magnetic contactor MC3 for turning on the trolley motor power
At the same time that the A contact MC3-a of the inverter 4A turns on, the A contact R3-a2 of the inverter-controlled forward/traverse relay R3 in the forward rotation control circuit of the inverter 4A turns on. When the power is turned on, the motor 6 rotates forward, and the electric trolley moves forward.

Next, when forward traversing switch _S5 is turned off, inverter-controlled forward traversing relay R3 is demagnetized, and the B contact R3-b1 of said relay R3 in the hoisting circuit and the lowering circuit is turned on. Since the B contact R5-b1 of relay R5 in the upper circuit and lowering circuit remains in the OFF state, the electric chain block cannot be hoisted or lowered.

On the other hand, the inverter-controlled forward and traverse relay R
3 is demagnetized, the B contact R3-b2 of the relay R3 in the second circuit-2 of the travel timer circuit
is turned on and the timer relay T1 is excited (the timer starts operating), and at the same time, the A contact R3-a2 of the relay R3 in the forward rotation control circuit of the inverter 4A is turned off, and the motor 6 in the electric trolley is decelerated. is started.

After a certain period of time, which is the time set by the timer, B contact T1-b of timer relay T1 is turned off, and relay R5 for traversing slow stop and electromagnetic contactor MC3 for turning on trolley motor power are demagnetized, so that the hoisting circuit The B contact R5-b1 of the relay R5 in the lowering circuit is turned on, and at the same time, the first circuit-1 and the second circuit of the traverse timer circuit are turned on.
A contact R5-a of the relay R5 in the circuit
1, R5-a2 is turned off, and the A contact MC3-a of the electromagnetic contactor MC3 is turned off due to the demagnetization of the electromagnetic contactor MC3, thereby cutting off the power to the motor 6.

After turning off forward/traverse switch _S5 ,
The motor 6 is decelerated and stopped within the time set by the timer.

Next, with the changeover switch _S1 in the independent operation state, that is, turned on, when the reverse traverse switch _S6 is pressed and turned on, the inverter-controlled reverse traverse relay R4 is energized, and the hoisting circuit and the lowering circuit B contact R4-b of the relay R4 in
1 is turned off, the electric chain block cannot be hoisted or hoisted even if hoisting switch _S3 and hoisting switch _S4 are pressed.

On the other hand, when the inverter-controlled reverse traverse relay R4 is excited, the A contact R4-a1 of the relay R4 in the traverse timer circuit is turned on.
Relay R5 for traversing slow stop and electromagnetic contactor MC3 for trolley motor power supply are energized, and A contacts R5-a1 and R5-a2 of relay R5 are turned on, and A contact R5-a1 is turned on. Therefore, the first circuit-1 of the running timer circuit is self-held, and furthermore, the B contact R5-b1 of the relay R5 in the hoisting circuit and the lowering circuit is turned off, and the two B contacts R3-b1, R5- b1
2 to prevent hoisting and lowering due to turning off.
heavily interlocked.

In addition, the magnetic contactor MC3 for turning on the trolley motor power
At the same time that the A contact MC3-a of the inverter 4A turns on, the A contact R4-a2 of the inverter-controlled reverse traverse relay R4 in the reverse control circuit of the inverter 4A turns on, so power is supplied to the motor 6 of the electric trolley via the inverter 4A. is turned on, the motor 6 rotates in reverse, and the electric trolley moves backward.

Next, when the reverse switch _S6 is turned off, the inverter-controlled reverse traverse relay R4 is demagnetized, and the relay R in the hoisting circuit and the lowering circuit is demagnetized.
The B contact R4-b1 of the relay R5 in the hoisting circuit and the hoisting circuit is turned on, but the B contact R5-b1 of the relay R5 in the hoisting circuit and the hoisting circuit remains in the off state. It is not possible to perform a downward drive.

On the other hand, the inverter-controlled backward traverse relay R
4 is demagnetized, the B contact R4-b2 of the relay R4 in the second circuit-2 of the traverse timer circuit
is turned on and the timer relay T1 is excited (the timer starts operating), and the A contact R4-a2 of the relay R4 in the reverse rotation control circuit of the inverter 4A is turned off, and the motor 6 in the electric trolley is decelerated. will be started.

After a certain period of time, which is the time set by the timer, B contact T1-b of timer relay T1 is turned off, and relay R5 for traversing slow stop and electromagnetic contactor MC3 for turning on trolley motor power are demagnetized, so that the hoisting circuit The B contact R5-b1 of the relay R5 in the lowering circuit is turned on, and at the same time, the first circuit-1 and the second circuit of the traverse timer circuit are turned on.
A contact R5-a of the relay R5 in the circuit
1, R5-a2 is turned off, and the A contact MC3-a of the electromagnetic contactor MC3 is turned off due to the demagnetization of the electromagnetic contactor MC3, thereby cutting off the power to the motor 6.

In addition, after turning off the reverse transverse switch S ₆ ,
The motor 6 is decelerated and stopped within the time set by the timer.

Next, press the pushbutton S ₁ for simultaneous operation of the changeover switch.
When -a is pressed to turn off the changeover switch _S1 , the operation mode changeover relay R6 is demagnetized, and the A contacts R6-a1 and R6-a2 of that relay R6 are turned off, and R6-b1 and R6 are turned off. -b2 is turned on.

In this state, when hoisting switch S ₃ is pressed to turn on, the hoisting magnetic contactor in the hoisting circuit is turned on.
Since MC4 is excited and its B contact MC4-b is turned off, power is directly applied to the motor 8 in the electric chain block without going through the inverter 4A, and the electric chain block is hoisted.

In addition, when the lowering switch _S4 is pressed and turned on with the changeover switch S1 turned off, the lowering electromagnetic contactor MC5 in the lowering circuit is energized and its B _contact MC5-b is turned on. The motor 8 in the electric chain block is directly powered on without going through the inverter 4A, and the electric chain block is operated for hoisting.

In addition, when the changeover switch _S1 is turned off, that is, when the operation is switched to simultaneous operation, A contact R6-a1 in the hoisting circuit and A contact R6-a1 in the hoisting circuit are
Contact R6-a2 is off and relay R
1, R2 is never energized and therefore,
Since the B contacts R1-b and R2-b of the relays R1 and R2 in the forward traversing circuit and the backward traversing circuit are held in the OFF state, as described above,
Switch for forward traverse S ₅ or switch for reverse traverse
By turning _S6 on and off, the electric trolley can be caused to move forward and stop, and move backward and stop.

Next, when the forward running switch _S7 is pushed to the first stage and the first stage contact _S7 -L is turned on, the inverter-controlled forward relay R7 of the low-speed forward running circuit XI is energized, and the A contact R7- of the inverter 4B is energized. a2
is turned on, the motor 9 of the traveling drive device is rotated in the forward direction at a low speed. In this case, the B contact R of relay _R7 installed in the low-speed reverse running circuit
Since 7-b is turned off, switch for reverse travel S ₈
Even if the first stage contact S ₈ -L is turned on, the inverter-controlled reverse travel relay R8 is not energized.

Next, when the forward travel switch _S7 is pushed to the second stage and the second stage contact _S7 -H is turned on, the speed changeover relay R9 is energized and the speed changeover switch R9-S is turned on.
Since the A contact terminals a ₁ and a ₂ are turned on, the motor 9 is switched to high-speed forward rotation under inverter control.

Next, after turning off the forward travel switch S ₇ , the first stage contact S ₈ -L of the reverse travel switch S ₈ is turned off.
When turned on, the inverter-controlled reverse travel relay R8 of the low-speed reverse travel circuit is energized, and the A contact R8-a2 of the inverter 4B is turned on, so the motor 9 of the travel drive device is rotated in reverse at a low speed. . In this case, the low speed forward running circuit XI
Since the B contact R8-b of relay _R8 installed in
Even if _S7 -L is turned on, inverter-controlled forward travel relay R7 is not energized.

Next, when the reverse travel switch _S8 is pushed to the second stage and the second stage contact _S8 -H is turned on, the speed changeover relay R9 is energized and the speed changeover switch R9-S is turned on.
Since the A contact terminals a ₁ and a ₂ are turned on, the motor 9 is switched to high-speed forward rotation under inverter control.

Note that the function of the traveling timer circuit is similar to that of the traversing timer circuit, so a description thereof will be omitted.

_FIG . 13 shows the relationship between the time and the motor operating state when the electric chain block motor is hoisted and hoisted under inverter control. When turned on, the inverter's output increases gradually, and the inverter's output is generated at the end of dead time _t1 at point B. At this point B, the motor starts and the inverter's output increases (for example, to 60Hz or 50Hz). Acceleration is performed at the end of the acceleration time C.
Then, hoisting operation starts at the speed set by the variable resistor for speed adjustment.

Next _, if the hoisting switch _S3 is turned off at a certain point D, and then, after a pause of several seconds t3, the hoisting switch _S4 is turned on, first the hoisting switch _S3 is turned off. The moment you turn off the motor, the motor's brake is activated and the motor's hoisting operation is stopped.
The mechanical brake of the electric chain block is activated, and then, at the end of the rest time _t3 and dead time _t2 , the inverter output is generated, and at this time E, the motor starts and the inverter output increases. Acceleration is performed, and at the end of the acceleration time F, lowering operation begins at the speed set by the speed adjusting variable resistor.

Next, when the lowering switch _S4 is turned off at a certain time point G, the motor brake is immediately activated to stop the lowering operation of the motor, and at the same time, the mechanical brake of the electric chain block is activated.

FIG. 14 shows _the relationship between time and motor operating state when _the electric trolley motor is operated under inverter control. When turned on, the inverter's output increases gradually, and at the end of dead time _t1 , the inverter's output reaches approximately 5 Hz. At this point B, the motor starts and the inverter's output increases (for example, up to 60 Hz or 50 Hz). ), acceleration is performed, and at the end of acceleration time C, traverse operation begins at the speed set by the speed adjustment variable resistor.

Next, when the forward traverse switch _S5 or the reverse traverse switch _S6 is turned off at a certain point D, the output of the inverter gradually decreases from, for example, 60Hz or 50Hz, so the motor is decelerated and the E At this point, the inverter's output reaches about 5Hz, the motor's brake is activated, and the motor stops rotating.
Next, at time F when the timer set time _t3 is reached, the motor power supply circuit is cut off.

FIG. 15 shows the relationship between time and motor operating state when the motor of the traveling drive device is operated under inverter control.

When carrying out the present invention, the mechanical brake of the electric chain block may have any structure other than that shown in the drawings. In addition, a two-stage push button operation switch is used as a changeover switch,
It may be configured such that when the second step is pressed, the lifting and lowering by the electric chain block is switched to the rated speed (direct control without using an inverter). Furthermore, the operation box 19 may be provided with a speed setting variable resistor corresponding to each motor 6, 8, and when the variable resistor is set to the highest speed, the motor may be switched to direct control. .

In addition, as the motors 6, 8, and 9, 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 operated in conjunction with the rotation of the motor. May be controlled.

As in the previous embodiment, the electric chain block 7
If a mechanical brake for preventing the suspended load from falling is provided in the speed reduction device, it is possible to eliminate the possibility that the suspended load will fall during the dead time at the start of the vertical movement in the inverter-controlled vertical movement.

〔Effect of the invention〕

According to this invention, two inverters 4A, 4
B can be used to simultaneously operate in two directions: up/down and traverse, up/down and travel, and traverse and travel.It operates when the electric trolley is decelerated by the inverter 4A, and delays the power supply to the motor 6 of the electric trolley 2. The electric trolley 5 and the traveling drive device 1 are provided with a timer relay T1 that operates when the traveling drive device is decelerated by the inverter 4B and a timer relay T2 that delays and shuts off the power to the motor of the traveling drive device. The vehicle can be brought to a gentle stop without forced braking, which improves safety.
Furthermore, by simply switching the changeover switch _S1 , the electric trolley 5 or the electric chain block 7 can be operated independently via one inverter 4A, and the electric trolley 5 can be operated via the inverter 4A and not via the inverter 4A. The operation of the electric chain block 7 can be switched to and from the operating state at the same time, so that a crane having an electric chain block that can be operated in various conditions can be manufactured at low cost. Furthermore, since the speed control circuit for the electric trolley with electric chain block, which is frequently in demand, and the speed control circuit for the traveling drive device, which is infrequently demanded, are configured as separate units, when the speed control device is manufactured to stock, ,
Effects such as being able to respond to various specifications without waste can be obtained.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
Figure 1 is a partially cutaway front view of a crane with an electric chain block, Figure 2 is a front view of an electric trolley with an electric chain block, Figure 3 is a side view thereof, and Figure 4 is a partial longitudinal section of the electric chain block. A side view, FIG. 5 is a vertical side view of the mechanical brake, and FIG. 6 is a vertical front view showing a part of the mechanical brake.
FIG. 7 is a front view of the operation box. Figure 8 is a diagram showing the speed control circuit of a crane with an electric chain block, Figures 9 to 12 are partially enlarged views of the speed control circuit, and Figure 9 is a diagram showing a crane with an electric chain block. A diagram showing the speed control circuit of the electric trolley, FIG. 10 is a diagram showing the vicinity of the inverter attached to the electric trolley with electric chain block, FIG. 11 is a diagram showing the speed control circuit of the traveling drive device, and FIG. FIG. 3 is a diagram showing the vicinity of an inverter attached to the drive device. Fig. 13 is a diagram showing the relationship between time and motor operating status when the electric chain block motor is operated under inverter control for hoisting and hoisting operations, and Fig. 14 is a diagram when the electric trolley motor is operated under inverter control. FIG. 15 is a diagram showing the relationship between time and motor operating state when the traveling drive device is operated under inverter control. In the figure, 1 is a traveling drive device, 2 is a traversing rail, 3 is a traveling rail, 4A and 4B are inverters, 5 is an electric trolley, 6 is a motor, 7 is an electric chain block, 8 and 9 are motors, 10
is a traverse drive device, 13 is a load sheave, 14 is a road chain, 18 is an operating cable, 19 is an operation box, 23 is a drive shaft, 25 is a hollow driven shaft, 26 is a large diameter driven gear, 27 is an intermediate shaft, 28 is a small diameter intermediate drive gear, 29 is a small diameter drive gear, 30 is a large diameter intermediate driven gear, 31 is a brake tightening board, 32
The ratchet wheel, 33 is a friction plate, 34 is a claw piece, _S1 is a switch for switching between simultaneous operation and independent operation, _S3 is a hoisting switch, _S4 is a hoisting/lowering switch, _S5 is a forward/traverse switch, S ₆ is a switch for traveling backwards, S ₇ is a switch for traveling forwards, S ₈ is a switch for traveling backwards, T ₁ and
_T2 is a timer relay, VR1 is a variable resistor for speed adjustment, VR2 is a low speed setting resistor, and VR3 is a high speed setting resistor.

Claims (1)

[Claims] 1. An electric trolley with an electric chain block is installed on a traversing rail 2 equipped with a traveling drive device 1 so as to be freely traversable, and the traversing rail 2 is an electric chain block that is installed on a traveling rail 3 so as to be traversable. In this crane, one inverter 4A is provided in the power supply circuit of the electric trolley with an electric chain block, the motor 6 of the electric trolley 5 is connected to the power source via the inverter 4A, and the motor 8 of the electric chain block 7 is , is connected to the power source via the inverter 4A, and is also connected to the power source without going through the inverter 4A, and the control circuit of the electric trolley with electric chain block includes the above-mentioned motor only for either one of the motors 6 and 8. Switching is made between an independent operation state in which electricity is supplied via the inverter 4A, and a simultaneous operation state in which electricity is supplied to the motor 6 of the electric trolley via the inverter 4A and to the motor 8 of the electric chain block 7 not via the inverter 4A. A changeover switch _S1 is provided for the purpose of running the traversing rail 2, and a timer circuit is also provided which is activated when the electric trolley is decelerated by the inverter 4A to cut off the power supply of the motor 6 of the electric trolley 5 with a delay. The motor 9 of the drive device 1 is connected to a power source via an inverter 4B, and the control circuit of the travel drive device 1 is as follows:
The inverter 4B and the traveling drive device 1 are provided with a traveling direction switching circuit and a timer circuit that is activated when the inverter 4B decelerates the traversing rail to cut off power to the motor of the traveling drive device with a delay.
1. A speed control device for a crane having an electric chain block, characterized in that a traveling drive control unit comprising a control circuit is independent from a control circuit for an electric trolley with an electric chain block.