JPH11128835A - Lift holder for table vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the specified lift of a vibration table of a table vibrator bearing the vibration table by means of air springs regardless of the weights of secondary concrete products and forms. SOLUTION: Detectors 11a, 11b, 12 for detecting the lift of the vibration table 5 are installed and a control circuit is so constituted as to feed and discharge air to the air springs 6 by the output signals of the detectors. As a result, the lift of the vibration table 5 is determined by the signals of the detectors and, therefore, the specified height is obtd. regardless of the weights of the secondary concrete products, etc., placed on the vibration table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for maintaining a raised height of a table vibrator, which is used when manufacturing a secondary concrete product.

[0002]

2. Description of the Related Art A table vibrator supports a vibrating table on which a concrete secondary product is placed with an air spring.
The vibration table is raised and lowered by supplying and discharging air to and from an air spring. Generally, the base frame and air spring of the table vibrator are installed in the pit, and the vibration table is installed so that the table upper surface is at the floor level of the work place when descending, and is mounted on the vibration table when the vibration table rises. A gap is formed between the lower surface of the formed form and the floor.

In the conventional table vibrator, the size and quantity of the air spring and the used air pressure are calculated so that the required height of the vibrating table can be secured at the maximum load. The air pressure used is constant irrespective of the loaded load (pressure corresponding to the maximum load). Air is supplied to and discharged from all air springs by one solenoid valve, and the vibration table is raised and lowered.

[0004]

In the conventional apparatus, since a constant amount of air is always supplied to the air spring, the rising height varies depending on the weight of the concrete secondary product placed on the vibrating table. That is, when the loading weight is light, the rising amount is large, and when the loading weight is heavy, the rising amount is small. And when the loading weight is light and the amount of rise of the vibration table is large, it has a bad influence on the air spring, the interval between the formwork placed on the vibration table and the concrete input machine becomes narrow, and concrete injection becomes difficult, and There has been a problem that the gap between the frame and the floor surface is widened, and there is a possibility that an operator may pinch a foot in the gap. In addition, when the concrete is loaded, the load is biased, and the air spring on the biased side may be compressed and the vibrating table may tilt, and the concrete is compacted in the tilted state, so the horizontal level of the secondary product However, there was also a problem that a leveling operation was required.

[0005]

According to the present invention, there is provided a table vibrator which is supported by an air spring, and in which a vibration table moves up and down by supply and discharge of air to and from the air spring, a detecting device for detecting a height of the vibration table. Is provided to supply and discharge air to and from the air spring in accordance with the output signal of the detection device, and a rising height holding device for the table vibrator is configured to keep the rising height of the vibration table constant. Although the detecting device can maintain the rising height at a constant level even if one detecting device is provided for one vibration table, as in the invention of claim 2, the detecting device is provided for each air spring. It is preferable to enable individual control for each air spring. Further, the detection device can appropriately use various sensors including those having various mechanical configurations. However, the detection device is a photoelectric sensor, a proximity sensor,
The structure is simple if it is configured by an ultrasonic sensor or a laser light sensor and a receiver, and one of the sensor and the receiver is attached to a vibration table and the other is fixed at a predetermined height. The arrangement of the sensor and the receiver is not specifically limited as long as the height of the vibration table (a deviation from a predetermined height) can be detected.

[0006]

In the present invention, when the raising switch of the vibration table is turned on, air is sent into all the air springs,
The swing table rises. When the vibration table rises to a predetermined height, the supply of air is stopped as detected by the detection device. Therefore, regardless of the load weight, the height at which the vibration table is raised is constant. According to the second aspect of the present invention, since the detecting device is disposed for each air spring, when the vibration table is tilted due to the introduction of the concrete, the detecting device detects the lowering and rising due to the unbalanced load,
According to the signal, the air of each air spring is supplied and exhausted, and returns to a horizontal state. Therefore, the above-mentioned conventional problems are solved.

[0007]

In FIG. 1, a transport path 2 having a rail 1 for transporting a formwork is provided in the front-rear direction, and a pit 4 for installing a table vibrator 3 is provided below the transport path 2. . A table vibrator 3 is installed in the pit 4, and a vibration table 5 is supported at four corners by four air springs 6. When the vibration table 5 is lowered, the upper surface thereof is almost at the same height as the transport path 2 (slightly lower than the rail 1 for transporting the formwork), and rises above the transport path 2 when ascending. It is. A gouge 7 is provided at the center of the vibration table 5 to avoid the conveyance path 2. A formwork or a formwork base to which the formwork is attached is placed on the upper surface of the vibration table 5 and fixed with fixing hooks 8 to apply vibration to the concrete. Reference numeral 9 in the figure is a base.

At the four corners of the base 9, a sensor mounting base 1 is provided.
The upper and lower photoelectric sensors 11a and 11b serving as detecting devices are attached to the mounting base 10 at a predetermined interval. At the four corners of the vibration table 5, metal plates 12 serving as receiving plates of the photoelectric sensor are attached. The photoelectric sensor 11a, 11b and the metal plate 12 constitute a detecting device.
Is at a predetermined height (for example, 3 cm from the conveying path surface), the metal plate 12 is located between the photoelectric sensors 11a and 11b so that light from the sensor does not hit the metal plate. The mounting base 10 is mounted via a long hole 13 so as to be movable in the left-right direction in FIG.
The two photoelectric sensors 11a and 11b are connected to one mounting frame 14.
When the mounting frame 14 is attached to the mounting base 10 so as to be movable up, down, left and right (for example, through a long hole), the height of the vibration table can be changed.

Hereinafter, a configuration for control will be described with reference to FIG. In the figure, reference numeral 15 denotes a controller, 16 denotes a relay terminal, 17 denotes a solenoid valve for controlling an air spring, 18
Is a metering valve with silencer for adjusting exhaust speed, 1
9 is a solenoid valve for rapid exhaust, 20 is a muffler,
21 is a filter, 22 is a regulator, and 23 is an air supply / discharge pipe.

1) Lifting of the vibration table When the lift switch (not shown) of the controller 15 is turned on, the solenoid valves 17, 19 are opened to the air supply side, air is supplied to each air spring 6, and the air spring 6 is inflated. The vibration table 5 moves up. The vibration table 5 is raised to a predetermined height, and the metal plate 12 is placed on the upper photoelectric sensor 11.
When the sensor responds by receiving the light of “a”, a rise detection signal is output. This signal is input to the controller 15, and a signal for closing the solenoid valve 17 is output from the controller 15, and the air supply is stopped. Therefore, the vibration table 5 stops at a predetermined height. The vibration table 5
The electric circuit is configured so that the response of the metal plate 12 to the lower photoelectric sensor 11b is ignored when the temperature rises.

2) Maintaining the height of the vibration table When the vibration table 5 becomes lower than a predetermined height, the metal plate 12 reacts to the lower photoelectric sensor 11b, and a lowering detection signal is output. This signal is input to the controller 15, a signal is output to open the solenoid valve 17 that supplies and discharges the air spring corresponding to the sensor from which the descent detection signal has been output from the controller 15 to the air supply side, and a descent detection signal is output. Air is supplied to the air spring corresponding to the sensor. Then, the air spring expands and the vibration table 5 rises, and the photoelectric sensor 11b below the metal plate 12 is raised.
When the reaction to is stopped, a signal to close the solenoid valve 17 is output from the controller 15, the air supply is stopped, and the vibration table 5 is maintained at a predetermined height. When the vibration table 5 becomes higher than a predetermined height, an upward detection signal is output from the upper photoelectric sensor 11a, a signal for opening the solenoid valve 17 to the exhaust side is output from the controller 15, and the height of the air spring is increased. Is lowered, and the vibration table 5 is lowered. Next, the lower photoelectric sensor 11a
Is stopped, a signal for closing the solenoid valve 15 is output from the controller 15, the exhaust is stopped, and the vibration table 5 is maintained at a predetermined height.

3) Lowering the vibration table When lowering the vibration table 5, the controller 1
When the lowering switch 5 (not shown) is turned on, the solenoid valve 19 for quick exhaust opens to the exhaust side, the air of the air spring 6 is instantaneously discharged, and the vibration table 5 is lowered.

In the above, when the exhaust speed of the air spring from the control solenoid valve is increased during height adjustment, the vibration table drops rapidly and it is difficult to maintain the rising level. A metering valve with silencer 18 is attached to the exhaust side of the valve to adjust the exhaust speed to be slow. Also, with a table vibrator incorporated in a continuous line,
Since it is necessary to increase the descending speed of the vibration table in response to a request for shortening the working time, a rapid exhaust solenoid valve 19 is provided for descending, and the descending speed of the vibration table is increased.

When the response of the sensor is directly sent to the control solenoid valve, the control solenoid valve supplies air to the control solenoid valve.
A phenomenon in which the vibration table swings up and down greatly due to repeated evacuation appears, and it becomes difficult to maintain the ascending level.
If the response of the sensor is not continued (about 5 seconds), the response of the sensor is not output to the control solenoid valve.

[0015]

According to the present invention, since the height of the vibration table can be detected and the height of the air spring can be adjusted, the height of the vibration table can be maintained at a constant level regardless of the loaded load. Therefore, the life of the air spring is extended without adversely affecting the air spring, there is no problem in putting concrete into the form, and the distance between the form and the transport path can be controlled as small as possible. Also, there is no possibility that the operator may pinch the foot. Also, if each air spring is configured to be independently controllable, even when the load is biased and the vibration table is tilted, it can automatically return to the horizontal state,
The workability is improved such that the horizontal level of the secondary concrete product is secured and the finishing work for leveling is not required.

[Brief description of the drawings]

FIG. 1 is a front view of an installed state of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment of the present invention.

FIG. 3 is a plan view of the embodiment of the present invention.

FIG. 4 is an enlarged view of a detection device according to the embodiment of the present invention.

FIG. 5 is a control circuit diagram according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rail 2 Transport path 3 Table vibrator 4 Pit 5 Vibration table 6 Air spring 7 Gouge 8 Fixing hook 9 Base 10 Sensor mounting base 11a Photoelectric sensor 11b Photoelectric sensor 12 Metal plate 13 Slot 14 Mounting frame 15 Controller 16 Relay terminal 17 Solenoid valve 18 Metering valve with silencer 19 Solenoid valve 20 Muffler 21 Filter 22 Regulator 23 Supply and exhaust pipe

Claims (3)

[Claims] 1. A table vibrator which is supported by an air spring and which raises and lowers a vibration table by supply and discharge of air to and from the air spring, is provided with a detection device for detecting a height of the vibration table. A table vibrator lift height holding device that is configured to supply and discharge air to and from the air spring based on the output signal, and that holds the lift height of the vibration table constant. 2. A table vibrator ascending height holding device according to claim 1, wherein a detecting device is provided for each air spring, and individual control is possible for each air spring. 3. The table vibrator according to claim 1, wherein the detection device comprises a sensor and a receiver, and one of the sensor and the receiver is attached to the vibration table, and the other is fixed at a predetermined height. Ascent height holding device