JPS594593A - Position setter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to opening degree setting and alignment position control of a grab bucket (hereinafter referred to as a packet) of an unloader or the like.

Conventionally, there has been a detection device of this type as shown in FIG. In the figure, (11 is a support drum, (2) is an opening/closing drum, and each drum (11i2+) is driven by a separate electric motor (not shown). A rope is wound around the drum (11i2+), and the amount of payout of this rope is determined. 1 packet + 81 from the difference number
The amount of opening is determined. To detect the opening amount, the drum shaft (
worm gear (3), (4) from la), (21)
A detection method was adopted in which the differential gear (5) was rotated through the cam +61 and the micro switch (7).

The conventional differential gear type opening detection device is configured as described above, so when replacing the packet, the force,
I had to change the position of the system. In addition, since the machine room where the cam is installed is located far away from the operator's cab, two people, the operator and the adjuster, must communicate with each other to make adjustments, and it takes a long time. However, there was a drawback that it was expensive and hindered operational efficiency.

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional device, and its object is to provide a device that allows opening degree setting operations to be easily performed by presetting operations while viewing packets.

An embodiment of the present invention will be explained below with reference to the drawings. Second
In the figure, the recess is a synchro transmitter, and ←υ is a synchro differential transmitter, which is directly connected to the support drum (1) and the opening/closing drum (2). α is an S/D converter, a′5 is a counter unit, (141) to (144) are dip switches (
(151) to (155) are digital comparators, (161) (16s) is a memory unit, αη is a comparator, (18) is a l)/A converter, (19+) is a Eyes closed memory switch, (192)
is an eye-opening memory switch. (191) (192)
is a one-way spring return type key switch,
Set in the driver's cab. (A1-(El is the output signal such as the limit and deceleration position, (Fl is the opening/lowering command from the drive device, (
G) is an analog output for opening degree correction.

Next, the operation will be explained. The 3-wire synchronized signal from the synchronized differential oscillator αυ is converted into an absolute value signal of a digital quantity by the S/D converter Q21 (in this case, the carry up/1 digit down signal corresponding to the multi-rotation input is converted into a counter). output to unit 03). The counter unit (1□□□) uses an absolute value signal and a carry/1 digit down signal to expand the counting range.

While pressing the "Packet change" push button in the driver's cab (operating this push button short-circuits the open/close limits that have been set up to that point), operate the main controller and visually move the packet to the open state. let

Thereafter, the eye-closed memory switch (191) is removed to reset the counter unit (13) to zero. Next, operate the master controller while pressing the "Change Packet" button and visually move the packet until it opens. Thereafter, the eye-opening memory switch (192) is opened, and the absolute value signal from the counter unit 03) at that time is stored in the memory unit (161).

The multipliers (141) to (144) execute multiplication of the multiplication factor set by the built-in dip switch and the absolute value signal from the memory unit (161), and this output is sent to the comparators (15, x) to (15s). It serves as a comparison standard. In packet opening/closing control, it is necessary to detect the extremes, the deceleration point, the jealousy start point, etc., but it is sufficient to set these points at a certain ratio with respect to the eye opening.

This ratio (multiplying factor) is set using multipliers (141) to (144). This setting is semi-fixed and does not require resetting when changing packets.

With the above operations, the preset operation is completed, and during subsequent packet opening/closing operations, the comparators (151) to (155)
) operates and outputs position signals of (A) to (El).

Furthermore, in conventional devices, the supporting and opening/closing motors are controlled at uniform speeds when opening and lowering the packet, but uniform speed control accumulates errors during acceleration and deceleration, and a constant opening cannot be achieved sufficiently. As a countermeasure for this, in this device, when the open/lower command CF) is input, the absolute value signal at that time is stored in the memory unit (162), and the subsequent absolute value signal from the counter unit α3) is compared on the comparator. , the error is converted into an analog quantity by the D/A converter a, and is used as a correction signal to the drive device.

Through this detection, alignment position control is achieved with high precision. In addition, the counter unit 0th floor and memory unit (161
) By adopting non-volatile memory in (162), the stored contents can be retained even in the event of a power outage, and there is no need to re-preset when using the same packet.As described above, according to the present invention, the packet position setting function Since the system has been moved to the operator's cab, settings can be changed by the operator alone, and operations can be performed easily and quickly. Furthermore, by adding some functions, alignment position control can be achieved with high precision.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a position setting device in a conventional unloader, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, (11 is a support drum, (2) is an opening/closing drum, (8) is a packet, (101 is a synchro oscillator, αυ
is a synchronized differential oscillator, (121 is an S/D converter, 03
) is a counter unit, (141) to (144) are multipliers, (15t) to (154) are digital comparators, and (161) and (162) are memory units. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Procedural Amendment (Voluntary) Commissioner of the Japan Patent Office] Indication of IG Patent application 11289/1989
No. 9 No. 2, Invention name position setting device 3, Ne+Ii il:, Representative piece 111, Part 4, Agent 5, Detailed description of the invention in the specification to be amended. 6. Contents of amendment (1) "Blood removal" in the second line of page 8 of the specification is corrected to "1 explanation." (2) On page 8, line 18 of the same book, "set." is corrected to "install." (3) In the same book, page 5, line 20, "unnecessary" is corrected to "become unnecessary."that's all

Claims (1)

[Claims] A support drum and an opening/closing drum for the club packet are driven by separate electric motors that are not mechanically connected, and a differential system that generates an output according to the difference in the amount of rope wound around the support drum and opening/closing drum. A synchronized transmitter, a memory that stores a signal corresponding to the output of the transmitter that is emitted when the opening/closing drum is opened, and a plurality of comparators that set a value obtained by multiplying the stored value of this memory by different desired values,
A position setting device characterized in that the settings of this comparator are the settings of both limits, a deceleration point, and a sag reduction start point.