JPS593189A - Concrete pump - Google Patents

Abstract

PURPOSE:To reduce local friction in a tube by providing a tube whose inner diameter is gradually reduced from the suction side towards the exhaust side and increasing the pressure in the closed section of the tube, thus reducing any reverse flow of concrete. CONSTITUTION:When preceding roller 7 starts to move away from tube 3 opening said tube, the suction (closed section) and exhaust sides partitioned by said preceding roller 7 acting as the boundary are communicated with each other. As the suction side is at a higher pressure, the reverse flow of the exhaust side concrete to the suction side is reduced. As said reverse flow of concrete cannot be stopped completely, local friction develops to some extent on the inner face of the tube 3 on exhaust side between A and C. As thickness 3' of this part has been increased and the eccentricity of the center of rotation O' of rotor body 4 is H, the compression at thicker part 3' of tube 3 is large and even if local friction develops, roller 7, 7' can close the opening passage of tube 3 completely.

Description

[Detailed Description of the Invention] A pumping action is applied to the Kibatsu 8J1u bombing tube by the pressing and rolling action of rollers and the restoring action of the tube itself, and a flow body such as concrete is sucked into the tube, and the sucked flow is This relates to a concrete pump designed to pump concrete.

Generally, in this type of concrete pump, the inside of the tube on the discharge side is in a high pressure state, with the rollers rolling to press the tube J: as a boundary, and conversely, the suction side is in a low pressure state.

Therefore, when the discharge and action by one roller is completed, and the roller moves forward, the roller is removed from the tube.
When i''L begins, the inside of the tube, which had been in a closed wave shape until now, begins to open, and the discharge side and suction side become connected through a narrow communication path. Conch 17-b The flow suddenly flows backwards through the narrow communication passage, and the inner surface of this narrow communication passage is extremely 1.
<It will be worn out. This causes significant local wear of the tube, shortening its lifespan.

The great invention is a concrete pump that solves the above problems and minimizes the pulses of concrete being pumped. The offer is dry.

To explain the actual flow side with reference to the drawings, (1) is a vertically installed cylindrical pump case, (2) is an elastic pad such as rubber that adheres to the inner wall of the case, and (3) is described later. With the pumping tube that is The lower end of this tube is connected to a hopper (not shown), and the L end of this tube is connected to a transfer pipe (not shown).

(4) The rotor body 14) is slightly eccentric to the lower blade than the center 0) of the pump case IH)
The rotating shaft (5) is rotatably installed, and the rotating shaft 1
5) Arm f61 with its center supported and arm (6)
The free end of the 1ef
It is composed of a pair of rollers (7) (7') that roll on the tube (4) while pressing the r aZ tube (41), and the roller m (ir is the same as the previous e pad (21) compressed by an appropriate amount). In this state, when the leading roller (7) comes to the north chord position and the following roller (7') comes to the bottom chord position, the pair of rollers +7+ tke+ is at the position B- in Figure 3. When it comes to line B, each roller (7) (BLT tube + 31
(r-Press 1 in a closed state to form a confinement part in the tube (3), and furthermore, a pair of rollers +7+ +7'+
-Band (2) and tube that were compressed even when moved to the A-A line 9 angles from the B-line F or the c-c drilling position +31 Thickness inside 1:3'l Because they are restored by elastic force , A to form a confinement within the tube (3).
0 Next, to explain the above-mentioned pumping tube (3), this pumping tube 13) is formed with a uniform outer diameter over its entire length, and the inner diameter gradually decreases from the suction side to the discharge side. Changed. It has a so-called tapered surface.

In addition, (8) is the thick part of the tube near the outer surface of the tube (
A reinforcing section such as a nylon cord or a steel cord is shown with a substantially uniform diameter within the section.

@The thick part of the tube 13) (for sea urchins 3)
The suction side is thin, the discharge side is thick, and the roller +71 +H
Due to the eccentricity (Hl) of the center of rotation (d) of the rotor body 4), the pressure on the discharge side is greater (-) than on the suction side.

With this Q rllij ihi (7') configuration, now rotation 1 [
fl +51 'e + drive - and arm (
6j? When it is rotated, the roller m (i) trx bombing tube (3), which is pivotally supported at both ends of the arm (6), is pressed and rolled on the tube (3), thereby causing the tube 13) acts as a pump, and sucks 1 body of fluid into the tube (3) from the ttm opening at one end connected to the hopper (17), and pumps the fluid sucked into the tube 13) to the opening at the other end connected to the transfer piping. It becomes like doing.

By the way, when the leading roller (7) comes to the suction and discharge completion position and the following roller (7') comes to the suction and discharge start position, that is, when it comes to the line A-A in Fig. 3. , each roller +7+ near'+ and the compressed band +21 close the inside of the tube (3), and the front cf2 pair of rollers +71 +7'l forms a closed part inside the tube 13).

Furthermore, each Leela +7+ +7'+ is i'1 from Moeki Itake.
Go ahead.

While moving to the C-C line, the IF compressed pad 12j and roller f7) (7+ causes the tube (3
), the following roller (7) moves in the direction of reducing the volume of the rupture confinement part, and the leading roller (7) moves in the direction of reducing the volume of the rupture confinement part. In addition, the volume of the enclosing part by the following roller (7) is reduced by the preceding roller (7).
Since the expansion of the confinement part is much larger than the expansion capacity of the confinement part, the volume of the confinement part is reduced as a result, and the pressure inside the confinement part is increased.

Further before -, e CCHh, J:') each 0 7
f7i', 7'l Advance the leading roller (
7) begins to separate from the tube 13) and the inside of the tube (3) begins to open, the discharge side bordering the leading roller (7) and the suction side (contained part) 2 will communicate with each other, but the suction ( l
Since the IWI (containment part) is at a higher pressure than the 1r-acting IC, the discharge side/cabinet flows back to the suction side @1.1 less. Although it is possible to reduce concrete backflow by increasing the pressure, it is not possible to completely stop concrete backflow. However, since the tube thickness in this part is thicker inside, and the center of rotation (d) of the rotor (4) is eccentric, the thicker part of the tube on the discharge side. Since the amount of compression of the surface is large, even if local wear occurs in the front 21 to end portions, the opening passage of the tube (3) will be reliably closed by the rollers +71 to +7'l.

In addition, when the roller t71+7'l moves from the person position to the C position, this is done by means of holding the closing part and restoring the compressed band (2) with (7).
If there is no pad (21), the retainer may be used by restoring the thick walled part of the compressed tube.

As described above, the great invention is that by forming a pumping tube whose outer diameter is uniform and whose inner diameter is gradually decreased from the suction side to the discharge side, -
The confinement in the tube by the second roller is increased in pressure as the roller moves, which reduces the backflow of concrete 11 into the tubular tube 1 and reduces local wear of the tube.

Furthermore, since the inside thickness of the tube is made thicker on the discharge side than on the suction side, the amount of compression inside the tube thickness on the discharge side can be increased, and even if local wear occurs on the tube on the discharge side, the tube 7 can be reliably compressed by the rollers. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing i: the concrete pump of the invention, and FIG. 2 is a cross-sectional view of the popping tube. FIG. 3 is a simplified diagram showing the operation of the great invention. (1) is the pump case, (3) is the bombing chive 2-,
(4) is the main body of the printer, and (7) is the roller. Applicant: Kyokuto Kaihatsu Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 3' A B C3 8, Guhe 7'

Claims (1)

[Claims] The pumping tube installed along the inner wall of the cylindrical pump case is given a pumping action by the pushing action of the roller of the rake body and the restoring action of the tube itself, and the concrete is drawn into the pumping tube as it dries and is sucked in. Concrete 11 - In a concrete pump configured to pump concrete, the pumping tube has an outer diameter that is uniform, and an inner diameter that gradually decreases from the suction side to the discharge side. The center of rotation of the end body is offset by an appropriate amount from the center of the pump case, so that the amount of compression by the roller inside the thickness of the first pumping tube is larger on the discharge side than on the suction side.