JPH053293U - Inverter controller for electric hoist - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the work efficiency by shortening the time required to traverse or run the electric hoist. [Structure] The electric hoist body is provided with a no-load detector 11, and when loaded, the inverters 26, 38 drive the motors 2, 3, 39, 40 of the traverse or traveling or both at the rated frequency to the rated speed. Inverter 26,
38 is a higher frequency than the rated motor 2, 3, 39, 40
Drive to move at high speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention allows the traverse speed or traveling speed of an electric hoist to be loaded or manually operated. The present invention relates to an inverter control device for switching.

[0002]

[Prior art]

  As a technology to switch the traverse speed or traveling speed of an electric hoist, the following has been used conventionally. Two things are known.

[0003]     Use a pole change type electric motor, select 4 poles when loading and rotate at low speed , 2 poles are used at no load to rotate at high speed.     Generally, an inverter with a maximum frequency of 60 Hz is used and the motor is Drive at the output of Hz, and reduce the output frequency on the low speed side.

[0004]

[Problems to be solved by the device]

    When using the pole change type electric motor to change traverse or traveling speed, Since the electric motor has a special structure, it takes a long time to manufacture and the delivery time is long. Also, high-speed pole If you select a number, the higher speed may cause slippage at startup.     When using an inverter, the maximum frequency is generally 60Hz The electric hoist cannot be traversed or run at high speed. Maximum frequency is 60 The reason why it is set to Hz is that the electric hoist runs on commercial power before the inverter is installed. The mechanical system was designed with a power supply frequency of 60Hz to take over. Because it was.

[0005]   As described above, the conventional technique is to make the electric hoist traverse or travel at high speed. Is insufficient. Especially with electric hoists, traverse distance or running Since the travel distance is generally longer, traverse or run at a rated speed or higher when there is no load. Focusing on the importance of improving work efficiency by It is an object of the present invention to provide an inverter control device suitable for this.

[0006]

[Means for Solving the Problems]

  The configuration of claim 1 of the inverter control device for an electric hoist according to the present invention is as follows. Installed on the no-load detector installed on the electric hoist body and on the operation box of the electric hoist. Direction switch to manually set the travel direction, and the electric hoist to traverse or run. The no-load detection is performed on the moving electric motor called "row" in the moving direction set by the direction setting switch. If the device detects a no-load condition, it supplies power at a frequency higher than the rated , If the no-load condition is not detected, the And a barter.

[0007]   The configuration as claim 2 is the same as in claim 1, except that the no-load detector is replaced by an electric power source. A speed setting switch for manually setting the high and low speeds provided on the operation box of the pneumatic hoist The inverter is provided with a moving electric motor in a set moving direction and a speed setting switch. If you set a high speed with a switch, supply power with a frequency higher than the rating and rotate it, When the low speed is set, the power of the rated frequency is supplied to rotate. And are characterized by.

[0008]

[Action]

  In claim 1, when the electric hoist is loaded, the electric hoist is installed. Traverse or run automatically at the rated speed in the defined direction. If no load, set Traverse or run automatically in a fixed direction at a higher speed than the rated speed To do.

[0009]   According to claim 2, regardless of whether or not the electric hoist is loaded, the operator judges If a low speed is set, the electric hoist will traverse or run at the rated speed in the set direction. To do. If you set a high speed, it will traverse or run at a speed faster than the rated speed.

[0010]

【Example】   Hereinafter, with reference to FIGS. 1 to 6, an invertor of an electric hoist according to an embodiment of the present invention. The control device will be described.

[0011]   1 and 2 show the schematic structure of an electric hoist as an application example of the present invention. Na 1 is a front view and FIG. 2 is a side view. In these figures, the electric hoist 1 Drive the two traverse motors 2 and 3 to drive the traverse rail 4 with the drive wheels 5 and 6. For example, for traversing in the east-west direction, and for each one of the not-illustrated traveling vehicles on both ends of the traverse rail 4 Driven by an electric motor, the car travels in the north-south direction along a travel rail (not shown). To go. Then, by driving the hoisting electric motor 7, the wire rope 8 is wound and unwound. Go and lift the luggage (not shown) hung on the hook 9. 10 is a book of electric hoist It is the body.

[0012]   As shown in FIGS. 1 and 2, the electric hoist body 10 is loaded as a no-load detector. A limiter 11 is installed. This load limiter 11 is as shown in FIG. It has a contact 11A, which turns on (closes) when there is no load and turns on when there is a load. F (open). Further, the contact 11A of the load limiter 11 is as shown in FIG. It is connected to the circuits in the control boxes 12 and 13. One control box 12 is an electric hoist book Although installed on the body 10, the other control box 13 is outside the main body 10.

[0013]   In addition, as shown in FIGS. 1 and 2, from the electric hoist body 10 to the cable 14. The operation box 15 closer to the operator is suspended. As shown in FIG. , Push button switch 16 for ascending, push button switch 17 for descending, east of the traverse Pushbutton switch 18, westbound pushbutton switch 19, push southward while traveling There is a button switch 20 and a pushbutton switch 21 for the north line. These su 16 to 19 of the switches are connected to circuits inside the control box 12 and other switches 20 to 20. , 21 are connected to the circuit in the control box 13.

[0014]   Then, a three-phase power source is input to the circuit 12A in the control box 12 to drive the hoisting motor 7 And the push-up switch 16 for raising is turned on so as to drive the hoisting brake 22. When the contact 23A of the relay 23 that is excited by The same electric motor 7 is connected in parallel with the contact 24A of the relay 24 to be excited. It In addition, the rectifier circuit 25 and the other contacts 23B and 24B of these relays 23 and 24 Connect the brake 22 via the, and release the brake 22 only when moving up or down. I have it. 12B is an upper limit emergency limit switch.

[0015]   Further, two transverse electric motors 2 and 3 are connected to the control box 12 via an inverter 26. It continues. 27 and 28 are brakes for each electric motor. Therefore, the control box 12 Inside is the circuit 29 shown in FIG. No load detector (load limiter when loaded) ) 11 is off, so timer relay 30 is off, so auxiliary relay 31 is off Yes, if you push the eastbound pushbutton switch 18 or the westbound pushbutton switch 19, , The corresponding auxiliary relay 32 or 33 is turned on and the corresponding relay contact 32A Alternatively, a signal is given to the inverter 26 through 33A. This makes the inverter The motor 26 generates electric power having a rated frequency of 60 Hz and supplies it to the traverse motors 2 and 3. The electric hoist is traversed east or west at the rated speed by rotating the electric hoist forward or reverse. Non-negative Since the load limiter 11 is turned on during loading, as shown in FIG. After a lapse of time, the timer relay 30 turns on, and then the auxiliary relay 31 turns on. Therefore, if you push the eastbound pushbutton switch 18 or the westbound pushbutton switch 19, , The corresponding auxiliary relays 32 and 34 or 33 and 35 are turned on, A signal is provided to inverter 26 through points 32A and 34A or 33A and 35A. Be done. As a result, the inverter 26 has a frequency higher than the rated frequency, such as 120 Hz. Of electric power is generated and applied to the traverse motors 2 and 3, and the electric hoist is operated at high speed in the east or west. Incline. When the inverter 26 operates normally, either auxiliary relay By turning on 32 to 35, a relay for braking through its contacts 32B to 35B. 36 is turned on, the brakes 27 and 28 are supplied with power via the rectifier circuit 37, and The brake is released. In FIG. 4, 30A to 30B are contacts of the timer relay 30, 31 A to 31F are contacts of the auxiliary relay 31, 36A to 36B are brake relays 36. It is a contact point. 12C is an upper limit switch.

[0016]   In addition, two traveling electric motors 39, 40 are also provided in the control box 13 via an inverter 38. Are connected. 41 and 42 are brakes of each electric motor. Therefore, as shown in FIG. As described above, the control box 13 also has a circuit 43 similar to that shown in FIG. When loading Since the mitter 11 is off, the timer relay 44 is off, so the auxiliary relay 45 is It is off, and pushbutton switch 20 for south line or pushbutton switch 21 for north line When pressed, the corresponding auxiliary relay 46 or 47 is turned on and its contact 46A or Is supplied to the inverter 38 through 47A. This allows the inverter 38 generates electric power of a rated frequency, for example 60 Hz, and supplies it to the electric motors 39, 40 for traveling. Forward or reverse by rotating the electric hoist at the rated speed to the south or north. Non-negative Since the load limiter 11 is turned on during loading, the timer Ray 44 is turned on, then auxiliary relay 45 is turned on. When the row push button switch 20 or 21 is pressed, the corresponding auxiliary relays 46 and 48 are Or 47 and 49 are turned on and their contacts 46A and 48A or 47A and 49A A signal is given to the inverter 38 through the. As a result, the inverter 38 is A high frequency equal to or higher than the rated frequency, for example, electric power of 120 Hz is generated and the traverse motor 39, Drive 40 south or north at high speed. When the inverter 38 is normal, When one of the auxiliary relays 46 to 49 is turned on, its contacts 46A to 49A are passed through. The brake relay 50 is turned on, and the brakes 41, 4 are connected via the rectifier circuit 51. 2 is fed and the brake is released. In FIG. 6, 44A to 44B are timer relays. -44 contact points, 45A-45F contact points for auxiliary relay 45, 50A-50B contact points It is the contact of the relay for brake. In addition, each motor 2, 3, 7, 39, 40 has a 3-phase induction. It uses a conductive motive.

[0017]   In the above embodiment, the load limiter 11 is used to automatically determine the traverse speed and the traveling speed. Although the speed is switched, the speed may be switched according to the judgment of the operator. In this case, replace the contact 11A of the load limiter 11 with a manual switch. The relays 30 and 44 are connected in parallel to the contacts 30A and 44A. This manual switch Is provided on the operation box 15, but is linked to the four push button switches 16-21. , Or a high-speed switch, a low-speed switch, or a high / low switching switch that is independent from these. Any of Ji is acceptable.

[0018]

[Effect of device]

  According to the present invention, the traverse speed or the traveling speed or both of them can be set at no load or by an operator. It is possible to operate at a higher speed than the rating according to the judgment. Therefore, rated under load If you make one-way traverse at speed, and at the time of no load on the way back, traverse at high speed of twice, It is possible to reduce the time by 25% as a whole. Also, the speed can be switched by the inverter Therefore, when starting at high speed, it is possible to set the acceleration time and stop time. Therefore, the swing of the hook can be prevented.

[Brief description of drawings]

FIG. 1 is a front view of an electric hoist.

FIG. 2 is a side view of an electric hoist.

FIG. 3 is a block diagram showing an embodiment of the present invention.

FIG. 4 is a circuit diagram of a traverse control system.

FIG. 5 is a flowchart of traverse control.

FIG. 6 is a circuit diagram of a traveling control system.

[Explanation of symbols]

1 electric hoist A few motors for traverse 7 Hoisting motor 10 Electric hoist body 11 No-load detector (load limiter) 12,13 Control box 15 Operation box 16-21 push button switch 26,38 Inverter 39,40 traveling electric motor

Claims (2)

[Scope of utility model registration request] 1. A no-load detector provided on the electric hoist body, a direction setting switch provided on an operation box of the electric hoist for manually setting a moving direction, and a moving electric motor for traversing or traveling the electric hoist. When the no-load detector detects the no-load condition in the moving direction set by the setting switch, it supplies and rotates the power of a higher frequency than the rated voltage.When the no-load condition is not detected, the power of the rated frequency is supplied. An inverter control device for an electric hoist, which comprises an inverter for supplying and rotating. 2. The method according to claim 1, further comprising a speed setting switch provided on an operation box of the electric hoist instead of the no-load detector, the speed setting switch manually setting the height of the speed, and the inverter is set as a moving electric motor. In the moving direction, when the high speed is set by the speed setting switch, the power of a frequency higher than the rated is supplied to rotate, and when the low speed is set, the power of the rated frequency is supplied to rotate. Inverter control device for electric hoist.