JPH09104011A - Oscillating vibration table type placing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a low noise and highly efficient placing device. A support member, a table swingably attached to the support member, a plurality of vibration exciters for vibrating the table, and a control unit for driving and controlling the vibration exciter are provided. And the shaker, the piston cylinder,
It consists of a spool piston built in the piston cylinder, upper and lower hydraulic chambers provided above and below the spool piston, and a valve built in the piston cylinder that controls the hydraulic pressure acting on the upper and lower hydraulic chambers. It is characterized in that it is fixed to both ends in the swinging direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when pouring ready-mixed concrete into a mold to form a concrete product, allows the mold to vibrate while uniformly spreading the concrete in the mold, Bleed the air inside,
The present invention relates to a driving device used for tightening.

[0002]

2. Description of the Related Art As a concrete product placing device, there is one as shown in FIG. This is because the vibrator 25 using an electric motor is supported on the lower surface of the table 2,
Both ends of are supported by springs 27. The vibration exciter 25 is configured such that an eccentric cam rotated by an electric motor applies vibration to the table 2. The table 2 has springs 27 installed on the stoppers 26 on both sides.
Supported by. Formwork for concrete products 1
Then, the ready-mixed concrete is poured into the mold 1 while being vibrated by the shaker 25. Further, in the case of medium / large size molding, a plurality of vibrators 25 are installed and placed.

[0003]

The weight of the table 2, the frame 1 fixedly mounted on the table 2 and the ready-mixed concrete is supported by the spring 27 by such a device, and the vibration exciter 25 is driven to perform the placing. However, due to the change in the total weight with respect to the supporting load (due to the filling of ready-mixed concrete), resonance may occur, or in the heads of multiple exciters, the synchronization of the individual exciters may be lost, resulting in inconsistency. It causes vibration. Especially,
For medium- and large-sized molded products, the output of the vibration exciter is selected based on the maximum weight.Therefore, at the time of starting the filling of the ready-mixed concrete with a light weight, it has an excessive vibration ability and increases the noise level due to resonance. This causes a reduction in vibration efficiency due to anharmonic vibration. In recent years, with the increase in size of secondary products, various cases requiring adjustment of excitation force have occurred, but noise suppression and efficiency improvement due to resonance with support springs and anharmonic vibration associated with driving multiple exciters. Is an important issue. Therefore, an object of the present invention is to efficiently convert the vibration energy of the vibration exciter into the driving energy, that is, prevent the energy loss due to resonance and anharmonic vibration, and perform the necessary and sufficient vibration force. Properly design the strength and weight of the frame to prolong the service life. Another object of the present invention is to provide a low noise and highly efficient placing device.

[0004]

SUMMARY OF THE INVENTION An oscillating vibrating table-type placing device according to the present invention comprises a supporting member, a table swingably attached to the supporting member, and a plurality of vibrating machines for vibrating the table. And a control unit for driving and controlling the vibration exciter. Then, the shaker includes a piston cylinder, a spool piston built in the piston cylinder, upper and lower hydraulic chambers provided above and below the spool piston, and a valve built in the piston cylinder for controlling the hydraulic pressure acting on the upper and lower hydraulic chambers. In addition, the vibration exciter is fixed to both ends of the table in the swinging direction.
With such a configuration, the load of the table is not supported by the spring but by the support member. At this time, if the left and right weights of the fulcrum are approximately equal, the moment balance is achieved, so that the vibrating and placing efficiency of the ready-mixed concrete is increased. A second invention is characterized in that, in the above invention, the control section includes a switching mechanism, and one of the vibration exciters at both ends of the table is selected and driven by the switching mechanism.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiment shown in FIGS. 1 to 3 is a placing device equipped with vibrators 5a and 5b using an impacting device. The table 2 is supported at its center by a support member 3 and is rotatable around a fulcrum 4. This support member 3
It is fixed to the gantry 7. Further, vibrators 5a and 5b are installed at both ends of the table 2, and a pedestal 7 near them is installed.
A stopper 6 having a spring 19 is fixed on the top. Both hydraulic exciters 5a and 5b are the same,
The structure shown in FIGS. 2 and 3 is provided. Inside the cylindrical piston cylinder 8, a valve 14 axially movable along the inner circumference of the piston cylinder 8 and a spool piston 12 are housed. Has been done. The spool piston 12 moves up and down by the pressure oil introduced from the high pressure port P, and strikes the receiving plate 15 via the auxiliary piston 13. Then, the table 2 fixed on the receiving plate 15 is vibrated.

The spool piston 12 is the auxiliary piston 1
Portions having diameters D1, D2, D3, D4, D5 and D6 are formed in order from the third side, and together with a plurality of annular grooves formed on the inner wall of the piston cylinder 8, a flow passage and a chamber are formed. The high-pressure port P communicates with the chamber a and the upper pressure chamber e by the flow passage 9, and the low-pressure port T communicates with the chamber b and the chamber g through the flow passage 10. Also, room f and room c
Are communicated with each other through the flow path 11. The spool piston diameter is D5 <D6 <(D1 = D3) <(D2 = D4). The valve 14 forms a lower pressure chamber k between the inner circumference and the spool piston 12, and the outer circumference has diameters d1, d2, d.
A hole J is formed while changing to 3 and d4. However, d1 = d4 <d3 <d2. Spool piston 1
At the tip of 2, an auxiliary piston 13 is installed on a receiving plate 15, and a non-compressible viscous fluid such as oil is injected into a chamber m formed between the receiving plate 15 and the auxiliary piston 13. There is. As a result, it is possible to prevent the noise generated when the spool piston 12 directly collides with the receiving plate 15.

Next, the operation of the vibrators 5a and 5b will be described. In the state of FIG. 2, the spool piston 12 moves upward and is in contact with the auxiliary piston 13.
At this time, the lower pressure chamber k on the inner side of the valve 14 passes through the hole J, and the chamber c on the upper outer side of the valve 14 moves through the flow passage 11
→ The chamber f → the flow path 1 → the chamber g communicates with the low pressure port T. The chamber a on the lower outer side of the valve 14 and the upper pressure chamber e on the upper side of the spool piston 12 are
It communicates with the high pressure port P, and the pressure p acts. Pressure p
Is supplied, the spool piston 12 moves downward due to the pressure action on the upper pressure chamber e. When the spool piston 12 moves downward, the large diameter portion of the diameter D2 closes the flow path l, and when the spool piston 12 further descends, the spool piston 12
As shown in FIG. 3, a flow path h is formed between the upper pressure chamber e and the chamber c on the outer circumference of the diameter D1 portion, and the upper pressure chamber e → the flow path h
The pressure p is introduced into the chamber c through the chamber f and the flow path 11. Then, the valve 14 (at the position shown in FIG. 2 at the beginning) is
The pressure p is received downward in the chamber c and upward in the chamber a. The pressure receiving area in chamber c is (d2-d1) ² · π /
4, and the pressure receiving area in the chamber a is (d3−d4) ² · π / 4. Here, since d1 = d4 <d3 <d2, the valve 14 moves downward due to the difference in the pressure receiving area to the position shown in FIG.

When the valve 14 moves downward, the hole J communicates with the chamber a, and the pressure p becomes the lower pressure chamber k inside the valve 14.
Is introduced into the lower pressure chamber k and the upper pressure chamber e.
-> Flow channel h-> Acts on chamber f. In the chamber f, the pressure receiving area acting downward with respect to the spool piston 12 is (D2-D
1) ² · π / 4, and the pressure receiving area acting upward in the lower pressure chamber k is (D4-D5) ² · π / 4. However, D2
Since = D4>D1> D5, the spool piston 12 starts moving upward due to the pressure receiving area difference. During the upward movement of the spool piston 12, the valve 14 initially maintains the position shown in FIG. 3, but the movement of the spool piston 12 causes the chamber f and the chamber g to communicate with each other. When the chamber c communicates with the low pressure port T, the valve 14
Rises to the state shown in FIG. As described above, the switching of the valve 14 and the movement of the spool piston 12 are repeated. While vibrating the table 2 by the vibrating machines 5a and 5b, the ready-mixed concrete is poured into the mold 1 installed on the table 2. At this time, since the support member 3 supports the weight of the ready-mixed concrete and the mold 1, the vibration force of the vibration exciter 5a or 5b can be used as the energy for placing concrete.

The second embodiment shown in FIG. 4 includes a vibrator 5a,
The drive control unit 16 that drives and controls 5b includes a switching mechanism. Individual shakers 5a and 5b
Is the same as that of the first embodiment, but the vibration exciter 5a installed at both ends of the table 2 by this switching mechanism.
Alternatively, one of 5b is selected and driven.
The drive control unit 16 drives the pump 18 driven by the electric motor EM and the pressure oil from the pump 18 to the shaker 5a.
Alternatively, the switching valve 17 is provided as a switching mechanism that supplies the vibrator 5b. When the switching valve 17 is switched to the right from the state shown in the figure, the vibration exciter 5a operates, and when switched to the left, the vibration exciter 5b operates. By switching the switching valve 17 to the right or left and driving the shaker 5a or 5b, while the ready-mixed concrete is being put into the mold 1 on the table 2, the inside of the mold 1 may be changed depending on the state of the ready-mixed concrete. Bias may occur in the ready-mixed concrete.

For example, when the ready-mixed concrete is charged to the left side of the support member 3, that is, the shaker 5a side while the shaker 5a is being driven by the switching valve 17, Since the vibration due to 5a is concentrated and applied to the side of the ready-mixed concrete, this bias is soon resolved. On the other hand, when the ready-mixed concrete is biased to the side of the vibrator 5b that is not operating, the switching valve 17 is switched to the left to drive the vibrator 5b. In this way, when the table is tilted to one side due to the deviation of the ready-mixed concrete in the formwork, the deviation can be efficiently eliminated by selectively driving the lower shaker. can do. In particular, when there is no deviation, both vibrators are driven alternately. Although not shown, the switching means of the switching valve 17 is switched alternately by a timer, or automatically switched depending on the position of the ready-mixed concrete feeding hopper, or the inclination state of the table 2 is detected and switched. You can also do so.

[0011]

EFFECTS OF THE INVENTION The rocking vibration table type placing device of the present invention is a supporting member provided separately from the vibration exciter so as to support a load such as a formwork or concrete, and the vibration exciter is mounted on the table. Since they are provided on both sides, the vibration energy of the vibration exciter can be efficiently used as the energy for placing concrete. Further, by selectively driving one of the vibration exciters provided at both ends of the table, it becomes possible to prevent uneven placement.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a sectional view of the vibration exciter according to the first embodiment, showing a state in which the spool piston collides with the auxiliary piston.

FIG. 3 is a cross-sectional view of the vibration exciter according to the first embodiment, showing a state in which the spool piston has returned downward.

FIG. 4 is a block diagram of a second embodiment.

FIG. 5 is a front view of a conventional example.

[Explanation of symbols]

 2 table 3 support member 5a, 5b vibrator 8 piston cylinder 12 spool piston 16 drive control unit 17 switching valve T low pressure port P high pressure port

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[Procedure amendment]

[Submission date] October 18, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

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[Fig. 2]

[Procedure amendment 2]

[Document name to be amended] Drawing

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[Figure 3] ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 23, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

When the valve 14 moves downward, the hole J communicates with the chamber a, and the pressure p becomes the lower pressure chamber k inside the valve 14.
Is introduced into the lower pressure chamber k and the upper pressure chamber e.
-> Flow channel h-> Acts on chamber f. In the chamber f, the pressure receiving area acting downward with respect to the spool piston 12 is (D2-D
1) ² · π / 4, and the pressure receiving area acting upward in the lower pressure chamber k is (D4− D6 ) ² · π / 4. However, D2
Since = D4>D1> D6 , the spool piston 12 starts moving upward due to the difference in pressure receiving area. During the upward movement of the spool piston 12, the valve 14 initially maintains the position shown in FIG. 3, but the movement of the spool piston 12 causes the chamber f and the chamber g to communicate with each other. When the chamber c communicates with the low pressure port T, the valve 14
Rises to the state shown in FIG. As described above, the switching of the valve 14 and the movement of the spool piston 12 are repeated. While vibrating the table 2 by the vibrating machines 5a and 5b, the ready-mixed concrete is poured into the mold 1 installed on the table 2. At this time, since the support member 3 supports the weight of the ready-mixed concrete and the mold 1, the vibration force of the vibration exciter 5a or 5b can be used as the energy for placing concrete.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

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[Fig. 2]

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

Claims (2)

[Claims] 1. A vibrating apparatus comprising: a supporting member; a table swingably attached to the supporting member; a plurality of vibration exciters for vibrating the table; and a control section for driving and controlling the vibrating machine. The machine consists of a piston cylinder, a spool piston built in the piston cylinder, upper and lower hydraulic chambers provided above and below the spool piston, and a valve built in the piston cylinder that controls the hydraulic pressure acting on the upper and lower hydraulic chambers. An oscillating vibrating table-type placing device, characterized in that the oscillating machine is fixed to both ends of the oscillating direction of the table. 2. The swing vibration table type striking apparatus according to claim 1, wherein the control unit has a switching mechanism, and one of the vibration exciters at both ends of the table is selected and driven by the switching mechanism. Equipment.