JPS5821117B2 - Squeezing concrete pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a squeeze type concrete pump for transporting fresh concrete using a tube.

First, an overview of the squeeze-type concrete pump will be explained.

As shown in FIG. 1, a tube 2 is arranged along the inner surface of a pump case 1, and a suction end 5 and a discharge end of the tube 2 are connected to a suction side opening 3 at the bottom of the case 1 and a discharge side opening 4 at the top. The ends 6 are respectively protruded, the suction end 5 is connected to a hopper 7 into which fresh concrete is introduced, and the discharge end 6 is connected to a feed conduit 22 for fresh concrete.

1, a transmission device (not shown) is fixed to a drive shaft 8 horizontally suspended in the center of the case 1, and a pair of rotary plates 9, 9 are loosely fitted at a predetermined interval in the axial direction. Rollers 10 and 10' are rotatably provided at both ends between the rotary plates 9 and 9 at positions where the tube 2 can be suppressed.

When the drive shaft 8 is driven clockwise, the rollers 10 and 10' are rotated counterclockwise by the transmission device, pressing the tube 2, while the rotary plate 9.9 is rotated clockwise as shown.

That is, while the rollers 10 and 10' themselves rotate counterclockwise, the rotating plates 9 and 9 rotate clockwise.

At this time, the tube 2 is pressed by the rollers 10 and 10', and after passing through the rows 210 and 10', the tube 2 returns to its original state and performs a pumping action to transport the fresh concrete.

Therefore, the tube 2 is made of an elastic material such as rubber to have restoring force, and the inside of the case 1 is kept in a vacuum state.

By the way, when the fresh concrete is transferred, the inner surface of the tube 2 is worn out due to the encroachment of sand and debris and friction caused by the flow of the fresh concrete. In the range of approximately 45 degrees to the left and right from the center of the outer circumferential side of the tube 2, which is in contact with the inner surface, it is particularly easy to get caught in sand and debris (and wear is severe).

and. This wear condition cannot be known from the outside,
For this reason, the wear of the tube 2 cannot be known until the part of the tube 2 that experiences the most wear is damaged and the ready-mixed concrete leaks from the broken part, which has the disadvantage of staining the inside or surroundings of the case with the ready-mixed concrete. there were.

Needless to say, if the tube 2 is damaged at even one point, it cannot be used as a pump.

Therefore, the present invention was provided in order to accurately know the wear status of the tube 2 and eliminate the above-mentioned problems.

This invention embeds a conductor that can be connected to an alarm circuit as appropriate within the wall thickness of the part of the tube 2 that is particularly abrasive, so that the state of wear can be detected externally before the tube is damaged. This will be described in detail below based on the embodiments shown in the accompanying drawings.

In FIG. 3, the conductor 11 that senses the wear of the tube 2 is
Place tube 2 within the wall thickness and tube 2 into pump case 1.
The tube is buried longitudinally along its entire length within a range of 45 degrees to the left and right from the center on the outer peripheral side of the tube 2 that contacts the inner surface of the case 1 when installed inside the tube.

One end 12 of the conductor 11 is led out to the end surface of the discharge end 6 of the tube 2, the other end 13 is led out to the end surface of the suction end 5, and a lamp 14 and a power source 15 are connected in series between both ends 12 and 13. Connecting.

The tube 2 also has an inner tube rubber 16, as shown in FIG.
The conductor 11 is composed of a reinforcing cord layer 17 and an outer covering rubber 18, and is buried on the inner tube rubber 16 side at the surface where the inner tube rubber 16 and the reinforcing cord layer 17 are in contact.

This is because when the inner tube rubber 16 wears out and reaches the reinforcing cord layer 17, the tube 2 will be damaged due to the slight transfer of fresh concrete due to the abrasion of the reinforcing cord layer 1T due to the flow of fresh concrete and the internal pressure of the tube. .

Next, the fresh concrete is transferred by moving the tube 2 to the roller 10.
, 10' rotate while pressing, and as the fresh concrete continues to be transferred, the inner rubber tube 1 of the tube 2
6 gradually wears out, and the conductor 11 finally breaks.

Then, the current that had previously flowed through the conductor 11, which had a low resistance, now flows through the ready-mixed concrete, which has a high resistance, causing a voltage drop and causing the lamp 14 to become weaker or go out. to warn that the inner surface of the tube 2 has worn out.

FIG. 5 shows a modification of the alarm circuit, in which one end 12 of the conductor 11
and the other end 13 are connected by a circuit in which a relay 19 and a power source 15 are connected in series, and a contact 20 that is opened and closed by the relay 19 is connected between one end and the other end of the power source 15.
A circuit in which the lamp 14 and the lamp 14 are connected in series is connected.

Therefore, normally the lamp 14 is off, but if the inner surface of the tube 2 is worn out and the conductor 11 is disconnected, the relay 19
is deenergized, the contact 20 closes, and the lamp 14 lights up to warn that the inner surface of the tube 2 is worn out.

The above example is a method that attempts to detect the wear condition by disconnection of the conductor 11, but in the example shown in FIG. This method detects when fresh concrete comes into contact with it.

That is, the conductor 11 is buried within the thickness of the tube 2,
One end 12 of this conductor 11 is led out to the end surface of the discharge end 6, and the other end 13 is buried within the wall thickness and is not connected to other conductors.

On the inner surface of the tube 2, a conductive part 21 that comes into contact with the permanently ready-mixed concrete is exposed, and this conductive part 21 and the conductor 11 are exposed.
A lamp 14 and a power source 15 are connected in series between one end 12 of the power supply.

As the inner surface of the tube 2 wears away and the conductor 11 is exposed and comes into contact with the fresh concrete, the conductor 11 becomes electrically conductive with the conductive part 21 through the fresh concrete, closing the lamp 140 circuit and the lamp 14 turning on. to warn of tube 2 wear.

Although only the lamp 14 is shown as a warning,
Alternatively, various alarm devices such as a buzzer may be activated.

As described above, in the squeeze-type concrete pump, the present invention embeds a conductor in the longitudinal direction of the tube within the wall thickness of the tube and on the outer circumferential side of the tube that contacts the inner surface of the pump when the tube is installed inside the pump case. At least one end of the conductor is led out of the tube, and the lead-out part of the conductor is connected to an appropriate alarm circuit that can detect changes in current, so the wear status of the inner surface of the tube can be accurately grasped from the outside, and the concrete There is no possibility of damaging the tube during use of the pump.

Furthermore, in the present invention, since the conductor is embedded in the longitudinal direction of the outer circumference of the tube at the location where the wear is most severe, damage to the tube can be reliably detected before it occurs.

Furthermore, during pumping, the tube is crushed by rollers, and if there is a conductor outside the outer periphery, the conductor expands and contracts, which may cause the conductor to break.

By embedding the conductor only on the outer peripheral side of the tube, the conductor does not expand or contract during pumping, and can be maintained in a normal state until the tube wears out.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an overview of the squeeze-type concrete IJ pump according to the present invention, FIG. 2 is a vertical cross-sectional view showing the state of wear of the tubes of the squeeze-type concrete pump according to the present invention, and FIGS. Figure 6 shows an embodiment of the present invention,
Figure 3 is a vertical cross-sectional view of the tube with an alarm circuit embedded in the outer circumference of the tube, and Figure 4 is IV-I of Figure 3.
1 and 5 are longitudinal sectional views taken along the V arrow, and FIG. 5 is a vertical sectional view showing another alarm device, and FIG. 6 is a longitudinal sectional view showing another detection method. 1... Pump case, 2... Tube, 8... Rotating shaft, 10, 10'-... Roller, 11... Conductor , 12... One end of the conductor.

Claims (1)

[Claims] 1 A pump action is performed on the tube along the inner surface of the pump case by a tube pressing action by a pair of rollers rotating around a rotating shaft and a restoring action of the tube itself, and concrete is sucked into the tube. In a squeeze-type concrete pump that discharges concrete that has been sucked in, a conductor is buried within the thickness of the tube and in the longitudinal direction of the tube on the outer circumferential side of the tube that contacts the inner surface of the pump case when the tube is installed inside the pump case. . A squeezing type concrete pump, wherein at least one end of the conductor is led out of the tube, and the lead-out portion of the conductor is connected to an appropriate alarm circuit capable of sensing changes in current.