JP2589005B2 - Position detection device for hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device for a hoist, and more particularly, to controlling a hoist by a microcomputer and increasing an output of a vertical position detecting point related to a hoist raising / lowering operation. The present invention relates to improvement of such a device.

[0002]

2. Description of the Related Art Recently, a hoist has been controlled by a microcomputer and centrally managed.

The prior art of controlling a hoist by a microcomputer is disclosed in, for example, Japanese Patent Application Laid-Open No. 56-78.
798, 61-203096 and the like.

[0004]

However, conventionally,
Even when the hoist is controlled by the microcomputer, the upper and lower positions are detected with respect to the vertical position detecting function related to the hoist raising / lowering operation. Is not considered.

[0005] In the inverter control hoist, the operation monitoring process is indispensable.
In order to adopt the same rotation detection method as the position detection process, it is necessary to mount both the rotation detection unit of the position detection device and the rotation unit of the operation monitoring board on the rotating shaft of the hoist at the same time. Is required.

A first object of the present invention is to increase the number of position detection points as needed when controlling a hoist by using a microcomputer, so that the position control of the hoist is multi-step control as compared with the prior art. The addition of the position detection points can be easily performed both electrically and structurally, and the connector on the extension board side is not limited to the use for simply adding the position detection points, but is connected to the main board side. It is an object of the present invention to provide a hoist position detecting device capable of taking out a command from a microcomputer located in an external connection circuit.

A second object of the present invention is to provide a compact inverter control hoist in which, in addition to the first object, inverter control processing and operation monitoring processing are combined with the functions of a position detecting device. SUMMARY OF THE INVENTION It is an object of the present invention to provide a hoist position detecting device capable of sufficiently securing a mounting position of a rotation detecting unit on a hoist rotating shaft with a margin.

[0008]

Means for Solving the Problems] The first object is the hoist position detecting device for detecting a vertical position of the hoist is vertically operated by the microcomputer, the main board of providing the microcomputer, the standard position detection point output Circuits and signals directly controlled by the CPU
A main substrate-side Expansion connector having output lines,
Before SL can be connected to the connector main board side extension, and is achieved by providing a expansion board to be added to the vertical position detecting point of Hui <br/> be sampled.

A second object of the present invention is to provide, in addition to the first structure, a plurality of sets of main board side additional connectors,
This is achieved by connecting the set to the control input of the inverter.

[0010]

According to the first configuration, when the hoist is controlled by the microcomputer, the number of position detection points is increased as necessary, and the position control of the hoist is controlled in a multi-step manner as compared with the conventional case. For example, by controlling the lifting / lowering speed of the suspended load in multiple stages and changing the speed smoothly in a stepwise manner without suddenly changing the speed at the time of lifting or lowering the suspended load, the speed is rapidly changed. If there is a need for work, if a set position is detected in advance during lifting and lowering of the suspended load, the vertical movement of the suspended load is temporarily stopped at that position. Can be done.

The addition of the position detection points can be easily performed both electrically and structurally by simply setting the corresponding connector on the additional board to the additional connector on the main board. it can.

Further, the connector on the extension board side is not limited to use for merely adding a position detection point.
A command from a microcomputer located on the main board side can be taken out to an external connection circuit. Therefore, by connecting various external circuits to the connector on the extension board side, for example, control of a hoist according to load can be performed. And the safety protection function can be enhanced.

In addition to the above, according to the present invention, the inverter
In addition, the inverter control process and the operation monitoring process in the motor control hoist can be combined with the function of the position detection device to be compact, and the mounting position of the rotation detection unit on the hoist rotating shaft can be sufficiently secured with a margin.

Further, according to the second configuration, the inverter
In addition, the inverter control process and the operation monitoring process in the motor control hoist can be combined with the function of the position detection device to be compact, and the mounting position of the rotation detection unit on the hoist rotating shaft can be sufficiently secured with a margin.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. It is a block circuit diagram showing one embodiment of a position detecting device for a hoist.

In this embodiment, as shown in FIG. 1, since the encoder 2 for detecting the rotation of the shaft of the motor 18 and converting the rotation into a pulse signal is mounted on the main board 1, the encoder 2 shown in FIG. As shown in (1), the main board 1 is installed at a position where the rotation of the motor shaft 24 can be directly detected by the encoder unit 2.

In FIG. 5, 25 is a hoist main body, 17 is a hoist control panel, 23 is a suspended load hook, and 22 is a load holding brake.
Is shown.

Here, the structure of the main board 1 will be described with reference to FIG. 1. In FIG.
An encoder unit that detects the rotation of the shaft of the motor 18 and converts it into a pulse signal, 3 is a hoist operation command input connector for inputting a hoist operation command input from the hoist control panel 17 to the CPU 9D, and 5 is a motor 18 The current value and the voltage value inputted to the microcomputer are detected by a current value / voltage value detecting section 4 and converted into an analog signal by a microcomputer (hereinafter, referred to as a microcomputer).
This is a current / voltage input connector for inputting to the A / D converter 9C in the microcomputer 9.

Reference numeral 6 denotes a position detection point data setting unit. The data setting unit 6 includes a setting switch 6A for instructing the CPU 9D to set a position detection point, and a step for selecting a position detection point to be set. And a switch 6B.

Reference numeral 7 denotes a display section for displaying the number of position detection points set as described above, and the content of an abnormality detected in the operation monitoring process.

Reference numeral 8 denotes a rewritable external ROM. In the illustrated embodiment, the external ROM 8 has a space for storing standard position data for four detection points, and two additional position data for six detection points. The microcomputer 9 has a space for storing the contents, and saves the contents from the internal RAM 9A of the microcomputer 9 when the power is turned off.

On the other hand, corresponding to the external ROM 8, the internal RAM 9A of the microcomputer 9 stores the external RO
There is a space for storing standard position data for four detection points and a space for storing two additional position data for six detection points in order to read out the contents from M8 and use it for processing in the CPU 9D.

The microcomputer 9 has a built-in ROM 9B for storing fixed data such as a position detection processing program, an operation monitoring processing program, and a load judgment processing program.
And an A / D converter 9C for converting an analog signal input from the current / voltage input connector 5 into a digital signal.
A CPU 9D for executing a program stored in the built-in ROM 9B and outputting a result, and a clock oscillator 9E for generating a basic clock of the CPU 9D.

Reference numeral 10 denotes a processing signal selection switch. The processing signal selection switch 10 selects a required program from a plurality of processing programs stored in the built-in ROM 9B by a single function or a combination depending on the application. , And the signal is supplied to the CPU 9D.

Reference numeral 11 denotes a standard position detection point output circuit. The standard position detection point output circuit 11 receives a signal from the microcomputer 9 and outputs a standard position detection signal for four detection points to the outside of the main board 1. , And a switching circuit TR for driving the relay.

Reference numeral 12 denotes a main board-side extension connector. The main board-side extension connector 12 has six signal output lines 12b directly controlled by the CPU 9D and a power supply output line 12h. The board-side extension connector 12 is connected to an extension connector 19 on the extension board 15 described later. In the illustrated embodiment, two sets of the main-board-side extension connector 12 are provided. Reference numeral 12a denotes an input line for detecting that the extension connector 19 on the extension board 15 side is connected to the main board side extension connector 12, and inputting a detection signal to the microcomputer 9.

Reference numeral 13 denotes an abnormality detection signal output circuit. The abnormality detection signal output circuit 13 outputs a signal to the outside of the main board 1 when an abnormality is determined by the operation monitoring processing, and a relay driving switching circuit. It has a circuit TR.

Reference numeral 14 denotes a power supply section for supplying power to each section of the main board 1 and an additional board 15 described later.

The above-described encoder section 2 and power supply section 1
4 does not necessarily need to be attached to the main board 1,
It may be configured as a separate unit.

Next, the structure of the extension board 15 will be described with reference to FIG. 1. In this embodiment, the extension board 1
Reference numeral 5 denotes a relay RY and a relay drive switching circuit TR corresponding to the main board 1, each having six position detection point outputs, and only connected to an additional connector 12 on the main board 1 side. Signal line 1 from microcomputer 9
2b to 12g and an additional board-side additional connector 19 to which the power output line 12h is electrically connected.

Here, the operation of the present embodiment will be described with reference to FIG. 1 while referring to FIG.

FIG. 3 is a flowchart showing an operation system of the position detecting device shown in FIG. First, a case where the position detection processing is selected by the processing signal selection switch 10 will be described.

When the hoist starts operating, the rotation of the motor 18 is detected by the encoder unit 5 and input to the microcomputer 9 as a pulse signal.

The microcomputer 9 counts the number of input pulses according to the selected position detection processing program, and
Comparison processing is sequentially performed for the number of position detection point data arbitrarily settable stored in the M9A and the number of data determined by the presence or absence of connection of the extension board 15 to the main board 1, and when they match, the detection is performed A signal is output to an output circuit corresponding to the point data.

When the additional board 15 is not connected to the main board 1 in the comparison processing of the position detection point data, the standard detection points are four detection points. Do with data.

When the output of the position detection points is between 5 and 10 detection points, one additional board 15
To increase the output.

As means for increasing the output, for example, as shown in FIG.
The extension board 15 is mounted on the guide rail 16, and the extension connector 12 provided at the plate end on the main board 1 side is mounted.
By simply inserting the sockets (or pins) of the additional connector 19 provided at the plate end on the additional board 15 side into the pins (or sockets), the signal lines 12b to 1
2g, the power output line 12h, etc. are connected at the same time, the operation is extremely simple and does not involve any other work in terms of electrical and structure.
By adding one additional board 15 to the main board 1, the number of position detection points is increased to 10 detection points.

At this time, the internal processing of the microcomputer 9 is basically the same as that before the addition of the substrate. However, as the number of position detection points increases, the number of position detection point data increases to ten. The comparison processing of the position detection points is performed with ten data.

It should be noted that one of four position detection point data
Switching to zero is performed by adding the additional board 1 to the main board 1.
By mounting the extension board 5, a signal is input to the input line 12 a of the main board side extension connector 12, and the microcomputer 9 determines whether or not the extension board 15 is present. When doing this, there is no need for the worker to be conscious.

On the other hand, in the illustrated embodiment, the main substrate 1
In the case where two additional boards 15 are added, that is, the internal processing of the microcomputer 9 in which the number of position detection points becomes 16 detection points at the maximum is basically the same as before the board addition, Since the number of position detection point data increases from 10 when one additional board 15 is added to the main board 1 to 16, the comparison processing of the previous position detection points is performed with 16 data. .

However, the switching of the position detection point data from ten to sixteen pieces can be performed by mounting two extension boards 15 on the main board 1 so that the two extension connectors on the main board 1 side can be switched. 12, each input line 12a, 12a
When the microcomputer 9 determines that the number of extension boards 15 has increased from one to two, the operator switches the position detection point data from ten to sixteen. You do not need to be aware.

Here, the position detection point data is set by the position detection point data setting section 6 of the main board 1 for all the detection points.

At the time of setting the position detection point data, the number of the detection point set is displayed on the display unit 7 so that the user can easily recognize it. In the case of using only the main board 1, 4 detection points are used,
10 detection points when one extension board 15 is mounted,
When two are mounted, an arbitrary detection point can be selected from the 16 detection points and set continuously.

The method of setting the position detection point data is as follows. First, the position detection point to be set is selected by the step-up switch 6B, and the load hook 23 of the hoist is stopped at the position where the detection point output is desired to be obtained. By pressing 6A, a setting signal is input to the CPU 9D. When the CPU 9D receives the setting signal, the CPU 9D stores the pulse count value at that time in the storage space of the detection point position data corresponding to the detection point selected to be set. And complete the settings.

Note that the position detection point data setting section 6 and the position detection point setting display section 7 are not installed on the main board 1 but are installed outside the main board 1 as separate units. Is input to the CPU 9D of the main board 1 so that the position detection point data can be set even if an operator does not approach the main board 1 mounted on the hoist body indicated by reference numeral 25 in FIG. Can be convenient.

Next, a case where the load judgment processing is selected by the processing signal selection switch 10 will be described.

That is, the current and voltage of the motor 18 detected by the current / voltage detector 4 and converted into digital signals by the A / D converter 9C are integrated by the CPU 9D to obtain a power value. For a part of the memory used in the position detection processing, if the load data based on the electric power value is stored instead of the position detection point data, the detection integration is performed in the same manner as in the position detection processing described above. The load value can be determined by comparing the power value with the load data and activating the output circuit corresponding to the matched data. Then, since the determination result can be taken out to the outside via the extension connector 19 on the extension board 15 connected to the extension connector 15 on the main board side, various external circuits are connected to the connector 19. Thereby, the control of the hoist according to the load and the safety protection function can be enhanced.

Next, a case where the inverter control processing is selected by the processing signal selection switch 10 in order to use the present invention for an inverter control hoist will be described with reference to FIG.

In the inverter control hoist, as described above, since operation monitoring is indispensable, a program that simultaneously functions in operation monitoring processing is used.

First, the configuration of the inverter control hoist will be described.

The mounting location of the main board 1 and its circuit configuration are the same as those in FIGS. 1 and 5, but the signal output lines 12b to 12f of the main board side additional connector 12 are
Reset input terminal 21b, forward input terminal 21c, reverse input terminal 2 in control input section 21 of inverter 20
1d, frequency command 1 input terminal 21e and frequency command 2 input terminal 21f, respectively.
Are set and configured such that a hoist hoisting operation is performed by a forward rotation instruction, a hoist lowering operation is performed by a reverse rotation instruction, a low frequency is set in the frequency command 1, and a high frequency is set in the frequency command 2.

The input line 12a of the main board side additional connector 12 is connected to the inverter 20 during the hoist operation.
Are connected to a signal output line 21a from which a signal is output.

Further, the abnormality detection signal output circuit 13 includes:
The solenoid of the hoist load holding brake 22 is connected.

Here, the operation of this embodiment will be described.

When a low-speed operation command for raising is input as an operation command of the hoist from the hoist operation command input connector 3 by the inverter control program, the signal output lines 12b to 12g of the main board side additional connector 12 are provided.
Are directly controlled by the microcomputer 9 and are connected to the signal output lines 12b to 12f of the main board side extension connector 12.
Are the inverter control input sections 21 as described above.
Are connected to the input terminals 21b to 21f of the inverter control input unit 21.
f, the corresponding forward input terminal 21c and the frequency command 1
The inverter 20 is operated by outputting a signal to each of the input terminals 21e.

When the inverter 20 starts operating, the operation signal is sent to the input line 1 of the main board side additional connector 12.
Input to the CPU 9D via 2a, the hoist load holding brake 22 is released by using the abnormality detection signal output circuit 13 in response to the input, and the hoist starts low-speed hoisting operation.

Similarly, when a lowering high-speed operation command is input from the hoist operation command input connector 3, the signal output lines 12d, 12d of the main board side additional connector 12 are provided.
f, output signals to the reverse rotation input terminal 21d and the frequency command 2 input terminal 21f, respectively, and when the inverter 20 starts operating, the CPU 9D receives the operation signal and releases the hoist load holding brake 22, The hoist starts high speed operation of lowering.

As described above, by using the position detecting device according to the present invention, the inverter control hoist can be raised.
Low-speed operation command, it is possible to perform a control process for the high-speed operation command lowered.

The operation monitoring process of the hoist is performed by the operation monitoring program in parallel with the inverter control process. The operation is as follows.

That is, from the encoder unit 2 to the CPU 9
Based on the count processing of the pulse signal input to D,
The presence / absence of rotation of the motor 18 and the direction of rotation are determined, and this is compared with the operation command of the hoist input from the hoist operation command input connector 3, and the motor lock
Reverse rotation, stall rotation, and non-instruction rotation are detected, and if abnormal, the signal output line 12 of the main board side additional connector 12
A signal is output to the reset input terminal 21b of the inverter 20 connected via the terminal b to reset the inverter 20 and stop the operation of the hoist.

The operation monitoring process does not function only when the inverter control process is performed, but can also function when the position detection process or the load determination process is performed. In this case, the abnormality detection signal output circuit 13 It can be used to output a signal to the outside of the main board 1.

On the other hand, in the embodiment shown in FIG. 4, in addition to the above-described inverter control processing, by selecting the position detection processing by the processing signal selection switch 10, the standard detection point output circuit 11 not used in the inverter control processing is output. Of the four detection points and two additional connectors 12, 12,
The position detection process can be performed using six detection points (a total of ten detection points) of one additional connector 12 not used for the inverter control process.

[0063]

The present invention is as described above. According to the present invention, when controlling a hoist by a microcomputer, the number of position detection points is increased if necessary.
Compared to the conventional method, the position control of the hoist is multi-step control, for example, the lifting load lowering speed is controlled in multiple steps, and the speed at the time of lifting or lowering the load is not suddenly changed, but is smoothly changed stepwise. By changing the speed, it is possible to eliminate the load fluctuation due to the rapid change of the speed, and if necessary for the work, if a preset position is detected during the lifting and lowering of the suspended load, the You can temporarily stop the vertical movement of suspended loads,
The work in using the hoist can be expanded, and the usability of the hoist can be greatly improved as compared with the related art.

Further, the addition of the position detection points can be easily performed both electrically and structurally simply by setting the corresponding connector on the additional board side to the additional connector on the main board side. it can.

Further, the connector on the extension board side is not limited to use for simply adding a position detection point.
A command from a microcomputer located on the main board side can be taken out to an external connection circuit. Therefore, by connecting various external circuits to the connector on the extension board side, for example, control of a hoist according to load can be performed. And the safety protection function can be enhanced.

In addition to this, according to the present invention,
In addition, the inverter control process and the operation monitoring process in the motor control hoist can be combined with the function of the position detection device to be compact, and the mounting position of the rotation detection unit on the hoist rotating shaft can be sufficiently secured with a margin.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of a hoist position detecting device according to the present invention.

FIG. 2 shows a main board and an additional board 15 indicated by reference numeral 1 in FIG.
It is a perspective view which shows the connection.

FIG. 3 is a flowchart showing an operation system of the position detection device shown in FIG.

FIG. 4 is a block circuit diagram showing one embodiment in which the present invention is applied to an inverter control hoist.

FIG. 5 is a front view of a hoist body on which the device of the present invention is mounted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main board, 2 ... Encoder part, 3 ... Hoist operation command input connector, 4 ... Current value / voltage value detection part, 5 ... Current / voltage input connector, 6 ... Position detection point data setting part,
9 Microcomputer, 10 Processing signal selection switch, 11 Standard position detection point output circuit, 12 Main board side connector for extension, 15 Extension board, 17 Hoist control panel, 18 Motor, 19 Extension Connector for board side extension.

Claims (4)

(57) [Claims] 1. A hoist hoist position detector for detecting a microcomputer a vertical position for vertical movement, the main board of providing the microcomputer, and the standard position detecting point output circuit, the signal controlled directly by the CPU a main substrate-side expansion connector having an output line, before SL can be connected to connector main board side extension, and characterized by comprising a expansion board to be added to the vertical position detecting point of <br/> hoist Position detecting device for hoist. 2. A hoist position detecting device according to claim 1, further comprising a plurality of sets of main board side connectors, one set of which is connected to a control input section of the inverter. 3. An apparatus according to claim 1 or 2, a part of the main board, the guide <br/> Doreru to support both sides of the extension board slidably disposed, opposing the expansion board and the main board
A position detecting device for a hoist, comprising an extension connector having a pin and a socket at an end portion of the extension board to be coupled when the extension board is inserted along the guide rail. 4. A position detection point data setting section for inputting a position detection point setting signal to a CPU and a position detection point setting display section according to claim 1, wherein the position detection point setting display section is provided outside the main board. Position detection device for hoist installed as a unit.