JPH0152633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass polishing apparatus that can automatically control the fluid pressure supplied to a pressure supply section to a predetermined pressure at all times using a computer or the like.

Automobile window glasses and the like are usually chamfered after being molded. This type of window glass, etc. has non-straight sides, and in glass polishing equipment used for such work, a pressure control device using a pressure regulator is used to keep the polishing tool in constant contact with the curved sides at a constant pressure. It is being

By the way, since the polishing tool is required to move relatively along the curved side from one end to the other end and polish while always being pressed against it with a constant pressure, the polishing tool has conventionally been generally referred to as a so-called polisher. This is done by setting it up on a tracing board. That is, in this method, the polisher is moved to follow the contour of a model that is similar to the curved side of the object to be polished.

However, with such conventional equipment, it is necessary to manually adjust for changes and fluctuations in air pressure in order to keep the pressure contact force of the polishing tool constant, which is disadvantageous and inconvenient in terms of polishing accuracy and work efficiency. Don't deviate.

In addition, the equipment using the profiling board becomes complicated, and it is not flexible enough to accommodate changes in product specifications.Furthermore, it is not possible to respond to cases where the pressure welding force is set differently in some parts, and in the end, the conventional pressure There is a problem in that it is difficult to automate and save labor in this type of polishing work by using a control device.

SUMMARY OF THE INVENTION In order to solve this problem, the purpose of the present invention is to provide an automatic control device that can be equipped with a microcomputer or the like so that even if the supply pressure to the pressure supply part fluctuates, it is always maintained at the standard set pressure. Provided is a glass polishing apparatus which is configured and further includes a pressure control device that is controlled with high precision.

In order to achieve this object, the present invention provides a pressure control device for controlling fluctuating fluid pressure to a predetermined pressure, such as a glass polishing device for chamfering a glass edge having a non-linear edge, etc., in which a polishing tool is kept at a constant pressure. The present invention is applied to a pressure control device for pressurizing the fluid to the side of the glass, and includes a means for detecting the pressure of the fluid supplied to the pressure supply part, a memory for storing reference data that is a set pressure, and actual measurement data from the detecting means. A computer section including a central processing unit (CPU) that compares and judges the reference data and outputs a control signal, a highly responsive valve controller such as a print motor driven by this control signal, and this valve controller. The pressure control valve is characterized in that it is equipped with a high-speed pressure control valve that is controlled by a pressure control valve, and controls the fluid pressure to the pressure supply part to a predetermined pressure.

A preferred embodiment in which the present invention is applied to a glass polishing apparatus will be described below in detail with reference to FIGS. 1 and 2.

FIG. 1 is a block system diagram of a pressure control device according to the present invention applied to a glass polishing apparatus, and FIG. 2 is a vertical cross-sectional view of a pressure control valve used in this device.

First, the overall structure of the glass polishing apparatus will be explained with reference to FIG. In the figure, reference numeral 1 denotes a glass polishing section, in which an object to be polished 2, which is an unpolished glass material with curved sides such as an automobile windshield, is automatically sequentially moved in the direction of arrow A by, for example, a belt conveyor (not shown). As it is fed, on one side there is a polishing device 7 consisting of a roller-shaped polishing tool 3 that presses against the curved side portion 2a, a lever 5 that supports this and has a rotating shaft 4, and a bellows 6 attached to the side surface of the polishing tool 3. A polisher 9, which is completely similar to the above-mentioned polisher 7, is also provided on the other side and is composed of a polisher 8 and the like that presses against the curved side portion 2b. In the polisher 7, the polishing tool 8 is brought into pressure contact with the curved side portion 2a by the pressurized air supplied to the bellows 6, and the polishing tool 8 is rotated by a driving means (not shown) to perform a predetermined polishing function. . Although FIG. 1 only shows the block system for controlling the polisher 7 on one side, the polisher 9 on the other side is constructed in exactly the same manner, and its explanation will be omitted.

Next, a control system for controlling the polisher 7 will be explained. A regulator 1 is attached to the bellows 6.
It has a function of controlling and stabilizing the air pressure from the air compressor 11 connected to the air compressor 11 connected to the air outlet of the regulator 10. This regulator 10 is specifically configured as a pressure control valve as shown in FIG. 2, and is driven and controlled by a motor 12, which is a valve controller, connected to this control valve.

The structure of the regulator 10, which is such a pressure control valve, will be specifically explained with reference to FIG. 2. In the figure, reference numeral 30 denotes a suction port, which is connected to the discharge port of the air compressor 11, and 31 is a discharge port, which is connected to the bellows 6 and the pressure sensor 20 on the side of the polisher 7. Reference numeral 12 designates the motor, and its rotating shaft is connected to a setting shaft 33 provided above a setting spring 32, and the setting spring 32 is compressed and relaxed in response to forward and reverse rotation thereof.

First, when the air pressure is being supplied at the set pressure, the flapper 34 closes the nozzle 35 due to the downward biasing action of the setting spring 32.
Therefore, the pressurized air supplied to the suction port 30 flows through the fixed throttle 36 and flows into the upper diaphragm chamber 37. Due to the back pressure of the upper diaphragm chamber 37, the first
The diaphragm 38 is pressed downward, and the valve rod 39 and the main valve 4 with which its tip abuts
0 is also pressed downward against the bias of the spring 41, which opens the main valve 40, allowing the pressurized air in the suction port 30 to flow through the main valve 40 to the discharge port 31, as well as the lower diaphragm chamber 42,
The feedback is also supplied to the feedback chamber 43, and back pressure acts on the first diaphragm 38, second diaphragm 44, and third diaphragm 45 at the same time, so that the back pressure of the upper diaphragm chamber 37 and the biasing pressure of the setting spring 32 are combined. Balanced against each other to maintain a predetermined pressure.

On the other hand, in the above equilibrium state, if the discharge pressure increases too much, this back pressure will push the third diaphragm 45 upward against the bias of the setting spring 32, and at the same time, the flapper 34 will also be pushed. Because of this, the nozzle 35 opens and the upper diaphragm chamber 37
The back pressure is released to the atmosphere through the nozzle 35 and the bleed hole 46 and is reduced in pressure. As a result, the first diaphragm 38 is displaced upward, and at the same time, the valve rod 39 and main valve 40 are also displaced upward, and the main valve 40 is closed.Furthermore, only the valve rod 39 is displaced upward, so that the exhaust port 47 opens and the discharge port 31, and excess pressure on the discharge side is released to the atmosphere.

In addition, if the discharge pressure drops too much, the setting spring 32 is biased downward and the second
Both the diaphragm 44 and the third diaphragm 45 are pressed downward, the flapper 34 closes the nozzle 35, and the back pressure in the upper diaphragm chamber 37 increases, causing the first
Press the diaphragm 38 downward. As a result,
The valve rod 39 and the main valve 40 are simultaneously displaced downward, the exhaust port 47 is closed, and the main valve 40 is also opened, so that the pressurized air in the suction port 30 flows toward the discharge port 31 side to replenish the reduced pressure.

In this way, even if the air pressure supplied to the polisher 7 side fluctuates, this control valve 10 uses the so-called nozzle flapper system to sensitively sense pressure deviations and performs a precise pressure regulation function to always keep the air pressure constant. Hold.

Note that when the setting spring 32 is completely relaxed, the main valve 47 is closed, so there is no flow of air from the intake port 30 to the discharge port 31 side, but some air is branched off and passes through the fixed throttle 36, and then Since the nozzle 35 is open, the air is discharged to the atmosphere through the bleed hole 46.

Also, since the output pressure from the discharge port 31 is proportional to (compression force of the setting spring 32)/(difference between the effective areas of the second and third diaphragms), the motor 12
It is possible to obtain pressure proportional to forward and reverse rotation.

The motor 12 is a servo motor that has high responsiveness and can withstand frequent reversible operation, such as a print motor, for example.

Now, returning to FIG. 1, reference numeral 13 indicates a pulse generator that generates repetitive pulses proportional to the number of rotations of the motor 12, and its output pulses are input to the CPU 15. 14 is a computer section, which includes a CPU (central processing unit) 15 that performs pulse counting processing, data comparison calculation processing, etc.;
I/F including a drive unit that transmits the command No. 5 to the motor 12 and drives the motor 12.
(Interface) 16, an input/output device 17 for inputting various control commands, and a memory 18 for storing reference data, which is set pressure.

On the other hand, 19 is a detection unit for the air pressure actually supplied to the polishing machine 7, which includes, for example, a pressure sensor 20 that uses an output pressure-electrical conversion element, an AD converter 21 that digitizes the output signal of this pressure sensor 20, and the like. The display section 22 displays actual measured values, and the actual measured pressure data output from the AD converter 21 is input to the CPU 15.

Further, 23 is a limit switch, which is arranged to be turned on at the starting point of polishing the object 2 to be polished. Reference numeral 24 denotes a pulse generator which is set when the limit switch 23 is turned on and generates a predetermined repeated pulse (for example, one pulse is generated when the object to be polished 2 moves by 0.5 mm), and this output pulse is input to the CPU 15.

To explain the operation of the glass polishing apparatus having the above configuration, first, the limit switch 23 is turned on at the starting point of polishing the objects 2 to be polished, which are automatically sent one after another. Due to this ON operation, pulses having the predetermined repetition frequency are generated from the pulse generator 24, and at the same time the CPU
The program starts and progresses at step 15. and,
At this starting point, the reference data Po, which is the set pressure stored in advance in the memory, and the actual measured pressure data Po' inputted from the detection unit 19 are sent to the CPU 15.
Comparison calculation is performed at , and the deviation ΔPo=Po−
Po′ is output. This deviation value ΔPo commands the rotation of the motor 12 to start depending on the presence or absence of the deviation and its sign, and the CPU 15 counts the number of pulses from the pulse generator 13, and when the number of pulses corresponding to the deviation value ΔPo is reached. command to stop the rotation of the motor 12. Specifically, the number of pulses from the pulse generator 13 is proportional to the amount of pressure control with respect to the amount of rotation of the motor 12, and a conversion parameter is set in advance, and when the deviation value ΔPo is [negative], the motor 12 is The motor 12 is commanded to rotate, the number of pulses obtained by this forward rotation is counted by the pulse number reading command, and when the number of pulses corresponding to the deviation value ΔPo is counted, the motor 12 is commanded to stop, and conversely, the number of pulses obtained by this forward rotation is commanded to stop. When the value ΔPo is [positive], the motor 12 is commanded to rotate in reverse, and the same operation as in the case of forward rotation is performed. The motor 12 is controlled in accordance with the CPU 15 and program instructions.

In addition, the CPU 15 counts repeated pulses from the pulse generator 24 that are generated in proportion to the amount of movement of the object to be polished 2. For example, in the embodiment, the pulse generation period is set to 1 pulse per 0.5 mm movement, For each pulse count, the above-described comparison calculation process between the reference data and the measured data and the control of the motor 12 based on the deviation value are repeated.

As a result of this operation, the object 2 to be polished moves in the direction of arrow A and is adjusted to the standard set pressure at the polishing start point, and then the polishing tool 3 moves along the curved side 2a of the object 2 to be polished. Although the pressure contact force gradually increases, the pressure is adjusted to a reference set pressure every 5 mm by the pressure control system, so in practice it is adjusted to a constant pressure almost continuously.

As is clear from the above description, the pressure control device according to the present invention automatically and highly accurately maintains a constant pressure or a predetermined pressure even if the supply pressure to the pressure supply section fluctuates. Control is performed, and flexibility is extremely high when it comes to changing the pressure supplied section, and furthermore, it can easily cope with the case where the pressure is set by partially varying the supply pressure.

In addition, when applied to a glass polishing device that chamfers a glass plate or the like having non-straight sides as in the embodiment, the pressure contact force of the polishing tool is controlled to be constant at all times, improving the polishing accuracy of such objects. In addition to being a significant improvement, it also exhibits a variety of great advantages, such as eliminating the need for conventional equipment such as a profiling board, and making it possible to completely automate this type of polishing work through assembly-line operations.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a block diagram of a pressure control device according to the present invention applied to a glass polishing device, and FIG. 2 is a diagram showing a pressure control device used in the present device. Pressure control valve (regulator)
FIG. In the figure, 10 is a regulator, 11 is an air compressor, 12 is a motor, 13 and 24 are pulse generators, 14 is a computer section, and 15 is a
CPU (central processing unit), 16 is I/F (interface), 17 is input/output device, 18 is memory,
19 is a detection unit, 20 is a pressure sensor, 21 is an AD
It is a converter.

Claims (1)

[Claims] 1. A bellows to which fluid pressure is supplied, a polisher that polishes a polishing tool that is brought into pressure contact with a non-linear portion of a glass material to be polished such as an automobile window glass while moving relatively, and a polisher that is supplied to the bellows. a fluid pressure detection means for generating a pulse at a polishing start point of the object to be polished; and a pulse generation means for generating a pulse at a polishing start point of the object to be polished; a comparison means for comparing pressure reference data;
A valve controller such as a motor driven by the deviation obtained from the comparison means and a pressure control valve controlled by the valve controller are provided, and the pressure contact force of the polishing tool to the glass material to be polished is provided. A glass polishing device characterized by controlling the pressure to a predetermined pressure.