JPH0429005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a position detection device for a moving body such as an electric hoist.

[Prior Art] Fig. 7 is an overall view of a conventional electric hoist operating range regulating device disclosed in, for example, Japanese Utility Model Publication No. 53-56682. In the figure, 1 is a frame, 2 is an electric motor, and 3 is an electromagnetic hoist. 4 is a brake; 4 is a reduction unit; 5 is a drum for hoisting and lowering the rope 6; 7 is a rope guide that moves in the axial direction as the drum 5 rotates; 8 is a guide fitting connected to the rope guide 7. , 9 are guide rods supported by the frame 1 so as to be movable in the axial direction, and support the guide fitting 8 in a slidable manner. Reference numerals 10 and 11 denote a pair of stoppers connected to predetermined positions of the guide rod 9, and 12 a limit switch connected to the outer periphery of the deceleration section 4, which is opened and closed by the left end of the guide rod 9 in the drawing.

Next, the operation will be explained. First, the drum 5 is rotated by the rotation of the electric motor 2 via the speed reducer 4, and the rope 6 is hoisted or lowered. Here, as the drum 5 rotates, the rope guide 7 moves in the axial direction, and the guide fitting 8 slides along the guide rod 9. For example, in the figure, when the drum 5 rotates forward and the guide fitting 8 moves to the left, the guide fitting 8 comes into contact with the stopper 10 at a predetermined position, and attempts to move the stopper 10 further to the left. do. On the other hand, since the guide rod 9 is supported by the frame 1 so as to be freely movable in the axial direction, the stopper 1
0 is pressed against the guide fitting 8, the guide rod 9 moves to the left together with the stopper 10, and the limit switch 12 is opened, for example, to stop the electric motor 2. By setting the stopper 10 to the over-winding position, over-winding can be prevented.

On the other hand, by rotating the drum 5 in the opposite direction,
The guide fitting 8 comes into contact with the stopper 11, and together with the stopper 11, the guide rod 9 is moved to the right in the figure.
For example, limit switch 12 is opened to stop electric motor 2. If this position is set as the over-lowering position of the hook (not shown), over-lowering of the hook can be prevented.

By the way, when these over-winding positions and over-lowering positions are changed, they are adjusted by changing the positions of the respective stoppers 10 and 11.

[Problem that the invention seeks to solve]

Since the conventional position detection device for a moving object is configured as described above, when adjusting the set position, the position of each stopper must be adjusted.
There was a problem that setting the detection position was troublesome.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a position detection device for a moving object that allows easy setting of a detection position.

[Means for solving problems]

A position detection device for a moving body according to the present invention includes a rotating body having a rotation amount corresponding to the amount of movement of the moving body, and a two-phase signal generating means for generating a two-phase signal according to the rotation direction and rotation amount of the rotating body. , a pulse conversion means for converting the output of the two-phase signal generation means into forward and reverse rotation pulses, an accumulation means for accumulating the output pulses of the pulse conversion means, and a comparison of the cumulative value of the accumulation means with a preset reference value. output command means for outputting an output command signal according to a preset promise; position signal output means for outputting a position signal according to the command signal of the output command means; forward rotation and reverse rotation pulses for the accumulation means; cumulative value correcting means for outputting and correcting the cumulative value; first correction command means for outputting a command signal for causing the cumulative value correcting means to output a forward rotation pulse; and outputting a reverse pulse for the cumulative value correcting means. a second correction command means that outputs a command signal to cause the cumulative initial value of the accumulation means to be set when both the first correction command means and the second correction command means output signals at an arbitrary position of the moving body; It is equipped with an initial setting means for setting.

[Operation] In the position detecting device for a moving body according to the present invention, corrected forward rotation and reverse rotation pulses are output from the cumulative value correction means to the cumulative value correction means, the cumulative value of the cumulative value is corrected, and the cumulative value correction means When a command signal is output from the first correction command means, a correction normal rotation pulse is output from the cumulative value correction means, and when a command signal is output from the second correction command means to the cumulative value correction means. When a correction reverse pulse is output from the cumulative value correction means and both the first correction command means and the second correction command means output signals at an arbitrary position of the moving body, the cumulative initial value of the accumulation means is initialized. This means that the detection position can be easily set.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained with a diagram. In Figures 2 and 3, 1
0 is a mounting plate connected to the end face of the reduction unit 4 via a bolt 11, 12 is a rotating shaft that passes through this mounting plate 10 and projects from the reduction unit 4, and 13 is this rotating shaft 1.
A mounting plate made of a magnetically permeable material is connected to the end of the mounting plate 13 via a bolt 14, and 15 is a magnetic disc attached to the end surface of the mounting plate 13 on the side of the reduction section 4 with adhesive.
It has a pair of NS poles at 180 degree symmetrical positions. Note that the magnet disk 15 and the mounting plate 13 constitute a rotating body. Reference numeral 16 denotes a printed circuit board assembly mounted on the mounting plate 10 via a supporter 17 between the magnet disc 15 and the mounting plate 10, and a pair of hole ICs 18 facing the magnet disc 15 are connected to the magnet circle. The A phase is arranged at an angle of 90 degrees with respect to the rotation center of the plate 15, and expresses the direction and amount of rotation of the magnet disk 15 by changes in magnetic flux as the magnet disk 15 rotates. It outputs a two-phase signal consisting of phase and B phase. A cover 19 is connected to the mounting plate 10 through bolts 20. In addition, the magnet disk 15
and a pair of Hall ICs 18 constitute two-phase signal generating means.

Next, in Fig. 1, 21 is a pair of Hall ICs.
Pulse converting means for converting the two-phase signal from 18 into forward rotation pulses and reverse rotation pulses; 22 is an accumulation means for accumulating the output pulses of this pulse conversion means 21;
Reference numeral 5 indicates an output command means for comparing the cumulative value of the accumulating means 22 with a preset reference value and outputting a command signal when the cumulative value is greater than the reference value; 26 indicates a position according to the command signal of the output command means 25; Position signal output means for outputting a signal, 27 is the electric motor 2 or the electromagnetic brake 3
28 is a setting mode switching means capable of disabling the output of the position signal output means 26 during the initial value setting mode of the position detecting device; 70 is a control circuit for supplying correction forward rotation and reverse rotation pulses to the accumulation means 22; This is a cumulative value correction means that outputs and corrects the cumulative value, and increases the cumulative value by +1 or -1. 71
A first correction command means outputs a command signal for causing the cumulative value correction means 70 to output a corrected normal rotation pulse, and is constituted by a push button switch 74. A second circuit 72 outputs a command signal for causing the cumulative value correcting means 70 to output a corrected reverse pulse.
This correction command means is composed of a push button switch 75. Reference numeral 73 denotes initial setting means for setting the cumulative initial value of the accumulating means 22 when both the first correction commanding means 71 and the second correction commanding means 72 output signals at an arbitrary position of the moving body. In FIG. 4, a microcomputer 29 includes a CPU 30, a memory 31, an input circuit 32, and an output circuit 33. In addition, the hall
A two-phase signal from IC 18 is input to input circuit 32 .
34 is a transistor whose base is connected to the output side of the output circuit 33, 35 is a relay coil connected in series to this transistor 34, 35a is its normally open contact, 36 is a winding push button, 37 is a normally open contact 35a This is a switch connected in parallel with the

Next, the operation will be explained. First, when setting the detection position of the position detection device, the switch 37 constituting the setting mode switching means 28 is closed, the hoist control circuit 27 is energized by the hoisting push button 36, and a predetermined hoisting position is set. The electric motor 2 is stopped at . In other words, hook (not shown, same below)
While checking the hoisting position of the hook, the electric motor 2 is stopped when the hook reaches a predetermined position. Here, when both the pushbutton switches 71 and 72 are turned on, it is determined in the flowchart of FIG. 5 whether or not it is a forward rotation correction command, and further, in step 51, it is determined whether or not it is a reverse rotation correction command. , pushbutton switch 7
Since both 1 and 72 are on, the accumulation means 22
The cumulative value of is set as an initial value in step 52. By the way, the two-phase signal from the Hall IC 18 is input to the pulse conversion means 21, and the pulse from the pulse conversion means 21 is further input to the accumulation means 22, so the switch 37 is opened and the push button 36 is input.
When the hoist is hoisted in step 53, the pulse conversion means 21 determines whether or not the hoist is rotating in the normal direction. If it is determined that it is a reverse rotation, a reverse rotation pulse is outputted in step 56. These forward rotation pulses or reverse rotation pulses are input to the accumulation means 22, and it is determined in step 57 whether or not they are forward rotation pulses.If they are forward rotation pulses, the cumulative value is incremented by 1 in step 58, and
At step 9, it is determined whether or not it is a reverse pulse. If it is a reverse pulse, the cumulative value is decremented by 1 at step 60. Furthermore,
In step 61, it is determined whether or not the cumulative value is larger than a reference value set in advance in the memory 31. If it is equal or smaller, a command signal is sent to the base of the transistor 34 constituting the position signal output means 26 in step 62. is output, the transistor 34 is turned on, the relay coil 35 is energized, the normally open contact 35a is turned on, and the hoist motor 2 is connected to the control circuit 2.
7, the winding can be controlled. Next, if the cumulative value is larger than the reference value, in step 63 the transistor 34 is turned off, the relay coil 35 is deenergized, the normally open contact 35a is turned off, and the push button 36 is turned off.
operation is disabled, and the electric motor 2 is stopped. That is, when the pushbutton switches 74 and 75 are turned on, in the block diagram of FIG. 1, the on signal is output to the initial setting means 73, and the CPU
30 is determined to be an initial setting step, and the accumulation means 22
In this case, the cumulative value is set as the initial value, for example, in Figure 6.
The value of A ₀ is stored in memory 31. That is, A ₀
The value of is set to the initial value. On the other hand, in the output command means 25, when the value of A ₀ is set to the initial value,
A ₀ -1 will be set as the reference value.
Therefore, when the electric motor 2 of the hoist is driven to hoist, for example, at the position _P5 in FIG. 6, the cumulative value _A5 becomes smaller than the reference value _A0-1 in step 61 of the flowchart of FIG. Since A ₀ -1>A ₅ , the transistor 34 remains on in step 62, the relay coil 35 is energized, the normally open contact 35a is on, and the hoist is hoisted. Operation continues. Next, when the position P ₀ in FIG. 6 is reached, the cumulative value A ₀ is changed to the reference value A ₀ - in step 61 of the flowchart in FIG.
It is determined that the value is larger than 1, and the output command means 25 outputs a command signal to turn off the transistor 34 as shown in step 63 of the flowchart.
The normally open contact 35a is opened, the motor 2 is stopped, and the hook is stopped at the _P0 position. By the way, during hoisting operation, the motor 2 is turned off at a position P ₀ where the cumulative value is larger than the reference value A ₀ -1. However, if the hook is raised to the position P ₁ due to the winding operation, the motor 2 is turned off. The position when off and the position when actually stopped will be different. Therefore, the cumulative value
When the push button switch 74 is pressed as many times as the difference between A ₁ and A ₀ , the cumulative value of the accumulator 22 is counted up, and the position of A ₀ is corrected from P ₀ to P ₂ . The motor 2 is stopped at position P ₂ , and the actual hook stop position is P _0.
maintained in position.

Next, in the case of lowering operation, if the electric motor 2 is stopped at the P ₀ position, the hook is similarly set to, for example, P ₃
It may stop at the position. In this case,
When the push button switch 75 is pressed for the number of counts equal to the difference between A ₀ and A ₃ , the cumulative value of the accumulating means 22 is counted down, and the position of A ₀ is changed from the position of P ₀ .
It is corrected to the P ₄ position, and the actual hook stop position is maintained from the P ₃ position to the P ₀ position. This will be explained using the flowchart shown in FIG. First, in step 64 it is determined whether the first correction command means 71 is outputting a command signal, that is, whether it is a forward rotation correction command or not. The cumulative value of the means 22 is incremented by 1, and this is repeated as many times as the normal rotation correction command signal is issued. If the forward rotation correction command pulse is not output, it is determined in step 66 whether or not the second correction command means 72 is outputting a command signal, that is, whether it is a reverse rotation correction command or not. For example, the cumulative value of the accumulating means 22 is decremented by 1 in step 67, and this is repeated as many times as the reverse correction command signal is issued, so that the position of the initially set cumulative value A ₀ becomes P ₀ from the position to the P ₂ or P ₄ position. In other words, in the case of this configuration, correction can be performed from both the winding direction and the winding down direction, and the correction work can be carried out in a short time.

Note that when both the pushbutton switch 74 constituting the first correction command means 71 and the pushbutton switch 75 constituting the second correction command means 72 are turned on, the initial setting means 73 is set as the accumulation means. 2
2, the initial setting value is set as described above, and the two pushbutton switches 7
4 and 75 are used as a command signal source for the initial setting means 73.

〔Effect of the invention〕

As described above, the present invention provides a rotating body having an amount of rotation corresponding to the amount of movement of a moving body, a two-phase signal generating means for generating a two-phase signal according to the direction and amount of rotation of this rotating body, and a two-phase pulse conversion means for converting the output of the signal generation means into forward and reverse rotation pulses; accumulation means for accumulating the output pulses of the pulse conversion means;
An output command means that compares the cumulative value of the accumulation means with a preset reference value and outputs an output command signal according to a preset agreement, and outputs a position signal according to the command signal of this output command means. position signal output means; cumulative value correction means for outputting correction forward and reverse rotation pulses to the accumulation means to correct the cumulative value; a second correction command means for outputting a command signal to cause the cumulative value correction means to output a correction reverse pulse; Since an initial setting means is provided for setting the cumulative initial value of the accumulating means when both command means output signals, the detection position can be easily set, and the number of push button switches for setting, for example, can be reduced. effective.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a cross-sectional view of the main part thereof, Fig. 3 is a side view showing the magnet disk, and Fig. 4 shows the electrical connection of Fig. 1. A circuit diagram, FIG. 5 is a flowchart showing its operation, and FIG. 6 is a graph showing positions and cumulative values.
FIG. 7 is a side view of the conventional device. In the figure, 15 is a magnet disk, 18 is a Hall IC, 2
1 is a pulse conversion means, 22 is an accumulation means, 25 is an output command means, 26 is a position signal output means, 27 is a control circuit, 28 is a setting mode switching means, 70 is an accumulated value correction means, and 71 is a first correction command. 72 is a second correction command means, and 73 is an initial setting means. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A rotating body whose rotation amount corresponds to the amount of movement of the moving body, two-phase signal generation means that generates a two-phase signal according to the direction and amount of rotation of this rotating body, and an output of this two-phase signal generation means that corrects the output of the two-phase signal generation means. A pulse conversion means for converting into rotation and reversal pulses, an accumulation means for accumulating the output pulses of this pulse conversion means, a cumulative value of this accumulation means is compared with a preset reference value, and output according to a preset agreement. Output command means for outputting a command signal, position signal output means for outputting a position signal in response to the command signal of the output command means, and a cumulative value for outputting forward and reverse rotation pulses to the cumulative means to correct the cumulative value. a first correction means for outputting a command signal for causing the cumulative value correction means to output a forward rotation pulse;
a second correction command means for outputting a command signal for outputting a reverse pulse to the cumulative value correction means; and a first correction command means and a second correction command means at an arbitrary position of the moving body. A position detecting device for a moving body, comprising initial setting means for setting an initial cumulative value of the accumulating means when both output signals.