CN106429831A - Hoist and overhead crane device using the same - Google Patents

Abstract

The invention provides a hoist which can make hoist action without using any special device to descend a suspended load safely. The hoist uses a hoist motor to roll up/back a hoist rope equipped with a hook. The hoist is characterized by comprising an encoder detecting the rotational speed of the hoist motor, a hoist brake applying brake to the hoist motor, and a brake control processing portion controlling the hoist brake. The brake control processing portion controls the hoist brake based on the rotational speed of the hoist motor detected by the encoder when a control portion is in a fault unloading mode.

Description

Traction machine and top lift using it

technical field

The present invention relates to an unloading technique when a control unit of a traction machine fails.

background technology

A traction machine (crane) moves up and down a load attached to a hook by using a traction device having an electric motor to raise and lower a rope. When the control part in the traction machine fails, the suspended load cannot be lifted and operated, and the suspended load needs to be unloaded.

As the background art in this technical field, there is Japanese Unexamined Patent Application Publication No. 2006-273547 (Patent Document 1). The publication describes the following technology: "When the crane fails, connect the branch line connected to the branch line from the main operating circuit of the traction motor/brake and the travel motor/brake taken out from the controller on the crane side to the outside. A coupler for the operating device of a faulty crane including an auxiliary operating circuit for controlling the traction and travel of the crane, through which the power supply is connected to the faulty crane, and the faulty crane can be re-operated through the operation panel for crane operation .” (see Abstract).

In addition, there is Japanese Unexamined Patent Publication No. 10-316377 (Patent Document 2). The publication describes the following technology: "The brake shaft connected to the rotating shaft of the main motor is connected to the rotating shaft of the micro-speed motor through the clutch part and the slow-speed side deceleration part. The handle is attached to resist the braking torque of the brake part that brakes the rotating shaft, and the rotating shaft is forcibly rotated." (see abstract).

prior art literature

patent documents

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-273547

Patent Document 2: Japanese Patent Application Laid-Open No. 10-316377

Contents of the invention

The technical problem to be solved by the invention

When the control part of the traction machine fails, the lifting operation cannot be performed. If the failure is in the state of hanging cargo, it is very dangerous to repair, so the hanging load needs to be unloaded.

In order to solve this problem, as a countermeasure when the control part of the traction machine fails, for example, in Patent Document 1, a structure that can be easily connected to another control panel is provided in advance on the control panel of the crane. When the control panel fails, another control panel is connected. The control panel makes the faulty crane move.

In addition, in Patent Document 2, by providing a handle for manually rotating the rotation shaft of the motor, the handle can be rotated at the time of failure to perform unloading.

In order to operate the faulty traction machine, it is necessary to provide a structure that can be easily connected to another control panel in the above-mentioned Patent Document 1 and to install another control panel. Rotate handle with swivel axis.

In addition, in either of the above-mentioned Patent Documents 1 and 2, in order to perform unloading, it is necessary for an operator to go up to the top of the factory where the traction machine is installed.

An object of the present invention is to provide a traction machine capable of operating a malfunctioning traction machine and safely removing a suspended load without requiring a special device.

Technical Solutions for Solving Technical Issues

In order to solve the above-mentioned problems, for example, the configuration described in the claims is adopted.

The present application includes a plurality of technical solutions capable of solving the above-mentioned technical problems. An example is given as follows. A traction machine that winds up/rewinds a sling with a hook installed by a traction motor, which is characterized in that it includes: an encoder for detecting the rotational speed of the traction motor; a traction brake for applying braking to the traction motor; and a brake control processing unit for controlling the traction brake, the brake control processing unit being in an unloaded mode in which the control unit fails , based on the rotational speed of the hoist motor detected by the encoder, the hoist brake is controlled.

Invention effect

According to the present invention, it is possible to provide a traction machine capable of operating a malfunctioning traction machine without using a special device, and unloading a suspended load safely. In addition, there is no need for an operator to go up to the top to operate in the event of a failure.

Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Description of drawings

FIG. 1 is a perspective view showing the overall structure of an inverter-type roof lifter according to an embodiment.

Fig. 2 is a block diagram showing the configuration of main parts of the inverter type roof lifting device of the embodiment.

Fig. 3 is a block diagram showing the configuration of unload control in the embodiment.

FIG. 4 is a diagram showing a configuration of brake control in the traction/traversing inverter control unit of FIG. 3 .

FIG. 5 is an example of a flowchart showing execution determination processing of unloading control.

FIG. 6 is a diagram showing an operation input device for performing the processing in FIG. 5 .

FIG. 7 is a flowchart showing brake control processing at the time of unloading.

Explanation of reference signs

1: Hook

2: Sling

3: Traction induction motor

4: Traction device

5: Traversing induction motor

6: Traverse device

7: Horizontal truss

8: Travel induction motor

9: Travel device

10: Truss for traveling

11: Traction/transverse inverter device

12: Traction/horizontal inverter control unit

13: Operation input device

14: Traction inverter

15: Inverter for running horizontally

16: Brakes for induction motors

17: Encoder

18: Inverter device for traveling

19: Traveling inverter control unit

20: Inverter for traveling

41: Brake control processing unit in normal mode

42: Brake control processing unit in unload mode

43: Operation input detection processing unit

44: Normal/uninstall mode switching processing unit

detailed description

Embodiments of the present invention will be described below using the drawings.

FIG. 1 is a perspective view showing the overall structure of an inverter-type roof lifter according to this embodiment.

The inverter type top lifting device includes a hook 1, a sling 2, a traction induction motor 3, a traction device 4, a traverse induction motor 5, a traverse device 6, a traverse truss 7, a travel induction motor 8, and a travel device 9. A traveling truss 10 , a traction/transverse inverter device (referred to as a main control unit.) 11 , an operation input device 13 , and a traveling inverter device 18 .

The inverter-type top lifting device uses the traction device 4 with the traction induction motor 3 to lift the sling 2, so that the goods installed on the hook 1 are moved in the Z direction (indicated by the arrows in the Z direction and -Z direction). .) That is, move up and down. In addition, in the X direction (indicated by arrows in the X direction and −X direction.) (horizontal direction), the traverse induction motor 5 rotates to move the wheels in the traverse device 6 in the X direction along the traverse truss 7 . In addition, the traveling induction motor 8 rotates in the Y direction (indicated by arrows in the Y direction and −Y direction.) (front-rear direction), and moves the wheels in the traveling device 9 in the Y direction along the traveling truss 10 .

Fig. 2 is a block diagram showing the configuration of main parts of the inverter-type roof lifter.

The traction induction motor 3 and the traverse induction motor 5 are controlled by a traction/travel inverter control unit 12 housed in a traction/travel inverter device 11 . That is, when the operator inputs a predetermined instruction from the operation input device 13, the traction/traverse inverter control unit 12 controls the traction inverter 14 and the transverse inverter 15, and the traction inverter 14 and the transverse inverter 15 The inverter 15 applies frequency, voltage, and current required for control to the traction induction motor 3 and the traverse induction motor 5, and at the same time performs release control on the brake 16 for the induction motor. The load on the hook 1 does not fall but moves in the Z direction. In addition, in the case of the device 6 for the traverse, the device 4 for the traction is moved in the X direction along the girder 7 for the traverse.

In addition, the traction/traversing inverter control unit 12 takes in information from an encoder 17 that detects the rotational speed of the motor, and uses the information on the rotational speed of the motor for the control of the inverter 14 for traction.

Similarly, when the travel induction motor 8 mounted on the travel device 9 is input by the operator from the operation input device 13, the travel inverter control unit 19 housed in the travel inverter device 18 controls the travel inverter. The inverter 20 applies frequency, voltage, and current required for control to the traveling induction motor 8 from the traveling inverter 20, and at the same time performs release control on the induction motor brake 16, thereby causing the traction device 4 to move along the traveling truss 10. Move in the Y direction.

The unloading structure when the control unit of this embodiment fails will be described with reference to FIGS. 3 to 7 .

Fig. 3 is a block diagram showing an unloading control structure.

The traction/traversing inverter control unit 12 is equipped with a microcomputer, and shifts to the unloading mode when abnormality is detected in the traction inverter 14 , the traction motor 3 , or the traction/traversing inverter control unit 12 itself. Here, the transition to the unloading mode is performed, for example, by clock interruption processing of the microcomputer of the traction/traversing inverter control unit 12 .

FIG. 5 shows an example of a flowchart of unloading control execution judgment processing. In addition, FIG. 6 shows an example of an operation input device for shifting to the unloading mode in the flow of FIG. 5 . The operation input device 13 is used to operate the roof lifting device, and has an on-off button for turning on and off the power supply, an up-and-down button for moving the hook up and down, an east-west button, and a north-south button for moving the hoisting machine. In the flow chart of FIG. 5 , in the operation input device 13 of FIG. 6 , an up operation is performed and a power-off operation is performed, and then when a power-on operation is performed, the operation shifts to the unloading mode.

First, it is confirmed whether it is the uninstall mode (S101), and if it is not the uninstall mode, the confirmation of the uninstall flag is performed (S102). Next, if the unloading flag is 0, it is checked whether the traction abnormality is being detected (S103), and if the abnormality is being detected, the up and down operation input is checked (S104). Then, if there is an up or down operation input, confirm the power-off operation input (S105), and if there is a power-off operation, set the unloading flag to 1 (S106). By setting the unloading flag to 1 in the above-mentioned order, when the unloading flag is 1 (S102), the power-on operation is confirmed (S107), and if there is a power-on operation, it shifts to the unloading mode (S108).

Since the transition to the unloading mode can be performed in the above-mentioned order, when the operation cannot be performed due to the abnormality detection of the traction, the upper operation can be performed and the power off operation can be performed, and then the unloading mode can be transitioned to only by the power on operation.

In FIG. 5, the method of returning to the normal mode after unloading etc. is to end the unloading mode and shift to the normal mode (S110) when a power off operation is detected in the unloading mode (S109).

In addition, in the examples of FIGS. 5 and 6, it is configured to shift to the uninstall mode by a specific combination of operation buttons, but it may also be set to a combination of other operation buttons, or it may be configured to shift to the uninstall mode. dedicated action buttons.

Here, whether to shift to the unloading mode can be confirmed by outputting the current operation mode from the traction/traversing inverter control unit 12, lighting a lamp, etc., or sounding an alarm by a buzzer, for example.

After shifting to the unloading mode, when a downward operation signal from the operation input device 13 is detected, the traction/traversing inverter control unit 12 unloads the suspended load by releasing the brake 16 of the traction induction motor 3 . At this time, the traction/traverse inverter control unit 12 instructs release/braking of the brake 16 so that the rotational speed of the traction induction motor 3 does not exceed a certain value.

FIG. 4 shows a configuration of brake control in the traction/traversing inverter control unit 12 of FIG. 3 . There is a brake control processing part 41 in the normal mode and a brake control processing part 42 in the unloading mode. The operation of the operation input device 13 is detected by the operation input detection processing part 43. The/unload mode switching processing unit 44 switches between the brake control processing unit 41 in the normal mode and the brake control processing unit 42 in the unload mode. In addition, in the brake processing unit 41 in the normal mode, the traction brake 16 is controlled based on the output frequency of the traction inverter, and in the brake control processing unit 42 in the unloaded mode, the traction brake 16 is controlled based on the rotation speed of the traction motor. 16.

In FIG. 3 , when the traction brake 16 is released, the hook 1 falls downward due to the weight of the suspended load and its own weight. When the traction brake 16 is released, the rotational speed of the traction motor is confirmed based on the signal from the encoder 17 directly connected to the traction motor 3, and the traction brake 16 is released/braked so that the rotational speed does not exceed a certain value. For example 500rpm. By performing brake control based on the rotation speed of the traction motor 3, unloading can be performed at a safe speed.

In addition, in the example of FIG. 3 , the rotation speed of the traction motor is controlled so as not to exceed a certain value, but the brake may be continuously controlled so that the rotation speed of the traction motor becomes a predetermined rotation speed.

FIG. 7 shows a flowchart of brake control processing at the time of unloading. FIG. 7 is a diagram showing unloading control performed when there is a down operation in the flowchart of FIG. 5 .

First, in step 201, it is judged whether it is in the unloading mode. If it is in the unloading mode, it is judged in step 202 whether there is a down operation. If there is a down operation, the release control of the traction brake is performed in step 204. At this time, in step 203 , when the rotational speed of the motor is, for example, 500 rpm or less, release control of the traction brake is performed, but in the case of exceeding 500 rpm, control of traction brake braking in step 205 is performed.

In addition, in the case of the normal mode, normal brake control processing (opening and closing control) is performed in step 206 .

According to this embodiment, when an abnormality is detected, that is, when the operation of the control unit cannot be performed, the operator does not need to go up to the top to operate. Moreover, if it is an ordinary inverter crane, the traction/traversing inverter control unit 12 and the encoder 17 are standard installations, so a faulty traction machine can be operated without using a special device, thereby enabling Safely lower suspended loads.

Claims (10)

1. a kind of traction machine, the hoist cable being provided with suspension hook is rolled/backrush using hoisting motor by it, and the feature of this traction machine exists In, including：

Detect the encoder of the rotating speed of described hoisting motor；

Described hoisting motor is applied with the traction brake of braking；With

Control the brake control process portion of described traction brake,

Described brake control process portion in the unloading mode that control unit breaks down, based on detected by described encoder The rotating speed of hoisting motor is controlling described traction brake.

2. traction machine according to claim 1 it is characterised in that：

Described brake control process portion, in the unloading mode that control unit breaks down, in the rotating speed of described hoisting motor is Discharge described traction brake when below egulation rotating speed, drag to described when the rotating speed of described hoisting motor exceedes egulation rotating speed Draw brake and apply braking.

3. traction machine according to claim 1 is it is characterised in that include：

Rotating speed based on hoisting motor is controlling the brake control process portion of the unloading mode of described traction brake；With

Control the brake control process of the normal mode of described traction brake based on traction with the output frequency of inverter Portion,

According to the normal mode inputting from operation inputting part or unloading mode, switch described two brake control process portions.

4. traction machine according to claim 3 it is characterised in that：

Described operation inputting part includes carrying out the on-off button of the on-off of power supply, makes what suspension hook moved up and down to press up and down Button, the thing button making traction machine movement and north and south button, by the combination operation of described button, input normal mode and unloading Pattern.

5. traction machine according to claim 1 it is characterised in that：

When the exception of described hoisting motor, traction inverter or traction inverter control unit is detected to described unloading Mode shifts.

6. traction machine according to claim 1 it is characterised in that：

Described hoisting motor carries out inverter control in normal mode.

7. traction machine according to claim 1 it is characterised in that：

There is the mechanism returning usual operation mode from unloading mode.

8. traction machine according to claim 1 it is characterised in that：

There is the mechanism of the state to operation modes such as outside output unloading modes.

9. traction machine according to claim 8 it is characterised in that：

To the mechanism of the outside state exporting described operation mode be lamp or chimes of doom produces mechanism.

10. a kind of top lowering or hoisting gear it is characterised in that：

Usage right requires the traction machine any one of 1～9.