JPS6131038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of hoisting and transporting objects using a plurality of electric chain blocks.

When a load chain of multiple electric chain blocks supports and lifts objects at several locations, if one electric chain block operates before the other electric chain blocks,
Problems arise in that an excessive load is applied to the electric chain block that is activated first, and that the object to be transported is lifted and transported in an inclined state.

The object of the present invention is to provide a lifting transportation method that advantageously solves the above-mentioned problems.

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

The drawing shows an example of lifting and transporting objects using four electric chain blocks. Four electric chain blocks EH ₁ to _{EH 4} are suspended and supported on a support frame 1, Each chain block is equipped with a load limiter 2 for detecting a predetermined preset tension, and each electric chain block is connected to a control panel 3 by a cable 4, and further connected to the control panel 3 via a cable 5. The operation box 6 has a lifting push button switch PB-U and a hanging button switch PB-.
D, 1st cam switch COS ₁ , 2nd cam switch
Equipped with COS ₂ and pilot lamp PL ₂ for displaying load equality.

Figures 2 and 3 show the operation control circuit, where R and ST are power lines, Tr is an operating power transformer, S ¹ and T ¹ are operating power lines, LS ₁ , LS ₃ , LS ₅ ,
LS ₇ is a limit switch for upper limit stop that is interposed in the power line of each electric chain block, LS ₂ , LS ₄ ,
LS ₆ and LS ₈ are limit switches for lower limit stop that are interposed in the power line of each electric chain block, and MC ₁ -
a, MC ₃ -a, MC ₅ -a, MC ₇ -a are the lifting electromagnetic contactor contacts interposed in the power lines of each electric chain block, and are connected to the lifting circuit of each unit (each electric chain block). E, G, I, K electromagnetic contactors
Controlled by MC ₁ , MC ₃ , MC ₅ , and MC ₇ . MC ₂
―a, MC ₄ ―a, MC ₆ ―a, MC ₈ ―a are the suspension magnetic contactor contacts that are interposed in the power lines of each electric chain block, and are connected to the suspension circuits F, H, and J of each unit. ，
It is controlled by L electromagnetic contactors MC ₂ , MC ₄ , MC ₆ , and MC ₈ .

When lifting one object with four electric chain blocks (units 1 to 4) EH ₁ to EH ₄ , first set the first cam switch COS ₁ to the "equal interlock" position, then the Contacts COS ₁ - 2 for equal load setting are turned on, relay CR ₃ of load equalization setting circuit C is energized, and B contact CR ₃ - b of that relay is turned off, so that the islanding circuit M and the load The interlocking suspension circuit P and the interlocking suspension circuit Q are opened.

Next, when lifting pushbutton switch PB-U is pressed to turn it on, relay CR 1 of lifting circuit A is energized, and relay CR ₁ of lifting circuit A is energized. The A contact CR ₁ -a of relay CR ₁ is turned on, and the electromagnetic contactors MC ₁ , MC ₃ , MC ₅ , MC ₇ of each unit lifting circuit E, G, I, K are energized.
These electromagnetic contactors are used to connect the lifting electromagnetic contactors of the power supply circuits of each unit EH ₁ to _{EH 4} to MC ₁ -a, MC ₃ -
Since a, MC ₅ -a, MC ₇ -a are turned on, each of the machines EH ₁ to _{EH 4} is operated in the lifting direction.

When a preset tension smaller than the tension during hoisting and transportation (for example, 1/5 of the tension during hoisting and transportation) acts on the load chain of each machine, the preset tension is applied to the load limiter 2 attached to each machine. Detected, each load limiter 2 contact OL ₁ ~
Since OL ₄ is turned on, the load limiter circuit U
Each relay CROL ₁ to CROL ₄ in is energized,
B contact of those relays CROL ₁ - b ~ _{CROL 4} -
b is turned off, and the electromagnetic contactor of each machine's hoisting circuit is turned off.
Since MC ₁ , MC ₃ , MC ₅ , and MC ₇ are de-energized, the lifting direction operation of each machine EH ₁ to _{EH 4} is stopped when the tension reaches the preset tension.

Next, when the first cam switch COS ₁ is switched to the "continuous" position, each contact COS ₁ in that switch
-1 and COS ₁ -2 are turned off, relay CR ₃ of load equalization set circuit C is demagnetized and its B
Contact CR ₃ - b is turned on and in this case, contact
Since CR ₄ -b is on, relay CR ₅ of the load interlocking lifting circuit P and relay CR ₆ of the interlocking lifting circuit Q are energized, and the A contacts of these relays are energized.
CR ₅ -a and CR ₆ -a are turned on.

In this state, press the lifting push button switch PB-U.
When you press this to turn it on, relay CR ₁ of lifting circuit A is energized, and lifting circuits E, G,
A contact CR ₁ -a of the relay CR ₁ in I, K
is turned on, and the electromagnetic contactor of the lifting circuit of each unit is turned on.
Since MC ₁ , MC ₃ , MC ₅ , and MC ₇ are excited, the lifting magnetic contactor contacts MC ₁ -a, MC ₃ -a, MC of the power supply circuit of each unit EH ₁ to _{EH 4} are excited by these relays. _Five
-a, MC ₇ -a is turned on and each unit EH ₁ to _{EH 4}
are operated in the lifting direction, and the objects to be transported are lifted and transported by each of the machines EH ₁ to _{EH 4} .

Next, when lifting pushbutton switch PB-U is released, relay CR ₁ of lifting circuit A is demagnetized, and the lifting and conveying operation is stopped.

When transporting an object that is suspended in the air, use the interlocking suspension circuit Q as described above.
relay CR ₆ is energized and the A contact of that relay is energized.
When CR ₆ -a is turned on, press suspension pushbutton switch PB-D to turn it on, relay CR ₂ of suspension circuit B is energized, and suspension circuit F of each unit is energized. , H, J, L
The A contact CR ₂ -a of CR ₂ is turned on, and the magnetic contactors MC ₂ , MC ₄ , MC ₆ , and MC ₈ in the suspension circuit of each unit are energized. Magnetic contactor contacts for suspension of power circuits EH ₁ to EH ₄
MC ₂ ―a, MC ₄ ―a, MC ₆ ―a, MC ₈ ―a are turned on, and each unit EH ₁ to _{EH 4} is operated in the hanging direction, so that the transported object is transferred to each unit EH. ₁ to EH ₄ .

Next, when the suspension pushbutton switch PB-D is released, the relay _CR2 of the suspension circuit B is demagnetized, and the suspension transportation operation is stopped.

When operating one of the four electric chain blocks EH ₁ to _{EH 4} , for example, the first electric chain block (No. 1) EH ₁ , first, set the first cam switch COS ₁ to the "single" position. When set,
Since the individual contact COS ₁ -1 in the switch is turned on, the relay CR ₄ of the individual operation circuit M is energized and its contact CR ₄ -a is turned on.

Next, set the second cam switch COS ₂ to No. 1 and turn on its contact COS _2-2 , then press the lifting pushbutton switch PB-U to turn it on, and the relay of the lifting circuit A is activated. Since CR ₁ is energized and its contact CR ₁ -a is turned on, the No. 1 unit lifting circuit E is closed and the electromagnetic contactor MC ₁ of that circuit is energized _. EH ₁
Since the lifting electromagnetic contactor contact MC ₁ -a of the power supply circuit is turned on, Unit 1 EH ₁ is operated for lifting.

When operating Unit 1 EH ₁ under suspension, press the suspension pushbutton switch PB-D to turn it on. Relay CR ₂ of suspension circuit B is energized and its A
Contact CR ₂ -a turns on, so the No. 1 suspension circuit F is closed, the electromagnetic contactor MC ₂ of that circuit is energized, and the electromagnetic contactor MC ₂ suspends the No. 1 power supply circuit EH ₁ . Since the lower magnetic contactor contact MC ₂ -a is turned on, Unit 1 EH ₁ is operated under suspension.

In addition, when suspending or suspending operation of an electric chain block in standalone operation,
As mentioned above, by releasing the lifting pushbutton switch PB-U or the suspension pushbutton switch PB-D and turning it off, relay CR ₁ of the lifting circuit A or the suspension circuit B is turned off. Just demagnetize relay CR ₂ .

When implementing this invention, load limiter 2
Any known structure can be used. In addition, since the number of contacts operated by relay CR ₄ of islanding circuit M is quite large, if a commercially available normal relay is used, the number of contacts will be insufficient.
In such a case, a plurality of relays may be connected in parallel and interposed in the islanding circuit M.

In the embodiment described above, four electric chain blocks are used, but the number of electric chain blocks used may be two or three, or five or more.

According to this invention, a load chain of a plurality of electric chain blocks supports a plurality of locations of an object to be transported, each electric chain block is operated in the lifting direction, and the load chain of each electric chain block is used to support the object at a plurality of locations during lifting and transportation. When a predetermined preset tension smaller than the tension is applied, this is detected by the detection device, and the detection signal causes the lifting direction operation of each electric chain block to be temporarily stopped, and the load chain of each electric chain block is After a predetermined preset tension is applied, each electric chain block is hoisted at the same time, so if multiple electric chain blocks are used to support and lift objects at multiple locations, some electric chain blocks may This has the effect of eliminating the risk of an excessive load acting only on the object or the object being transported in an inclined state.

[Brief explanation of the drawing]

The drawings show an example of an apparatus for carrying out the present invention, in which FIG. 1 is a perspective view showing an electric chain block and an operation control section, FIGS. 2 and 3 are views showing an operation control circuit, and FIG. 4 is a perspective view showing an operation control circuit. The figure is an enlarged front view of the operating section. In the figure, 1 is a support frame, 2 is a load limiter, 3 is a control panel, 6 is an operation box, and EH ₁
~EH ₄ is an electric chain block, PB-U is a lifting push button switch, PB-D is a hanging push button switch, and COS ₁ and COS ₂ are cam switches.

Claims (1)

[Claims] 1 The load chains of multiple electric chain blocks support multiple locations of the transported object, drive each electric chain block in the lifting direction, and apply a predetermined tension to the load chain of each electric chain block that is smaller than the tension during lifting and transportation. When the preset tension is applied, this is detected by the detection device, and the detection signal is used to temporarily stop the operation of each electric chain block in the lifting direction, and the preset tension is applied to the load chain of each electric chain block. The lifting transportation method is characterized in that, after the action of the electric chain block, each electric chain block is simultaneously operated in the lifting direction to lift the object to be transported.