JP2011027097A - Tube pump for vacuum squeeze pump vehicle capable of pressure-feeding concrete having slump of 8cm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a squeeze roller from being damaged by catching a solid material in rotation thereof to improve durability thereof by reducing a flowing resistance of a pressure-fed raw material as much as possible on a suction opening side and quickening the elastic return of the tube on the suction side to raise the raw material filling efficiency. <P>SOLUTION: This tube pump includes: a housing formed into a circle in the inner peripheral surface thereof; a flexible tube 3 projecting out of the housing in both ends thereof; and a squeeze roller 4 rolling along the inner peripheral surface of the housing for rotation, crushing the tube to close it, one end of the tube is used as a discharge opening and the other thereof is used as a suction opening 7, the suction opening is connected to a raw material supply part so as to suck the raw material of the raw material supply part into the tube with rotation of the squeeze roller and so as to pressure-feed the raw material to the discharge opening. At least one part of the inner peripheral surface of the tube between the suction opening and a part, in which the squeeze roller starts to abut on the tube, is formed with a flowing assist layer 22 for the raw material. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an improvement of a pumping tube in a ready-mixed concrete pump truck.

A vacuum squeeze pump disclosed in Patent Document 1 is known as a pumping tube for a ready-mixed concrete pump truck.
This vacuum squeeze pump has a housing with a circular inner peripheral surface, a flexible tube that is disposed along the inner peripheral surface of the housing and protrudes from both ends of the housing, and an inner peripheral surface of the housing. A squeeze roller that rolls along and crushes and closes the tube, and rotates while closing the tube. One end of the tube protruding from the housing on the lower rotation side of the squeeze roller serves as a discharge port, and the other end is sucked The suction port is connected to the ready-mixed concrete supply section, and the squeeze roller rotates to suck the ready-mixed concrete in the ready-mixed concrete supply section into the tube and pump it to the discharge port.

However, with such a general ready-mixed vacuum squeeze pump, the ready-mixed concrete with a hardness of 8 cm, which exceeds 15 cm of the ready-made concrete slump shown in FIG. 5, cannot be pumped.
The gist of this patent is to provide a vacuum squeeze pump capable of pumping raw concrete slump 8 cm in a squeeze pump car.
Therefore, first, the fact that the ready-made concrete of a slump of 8 cm can be pumped with the vacuum squeeze pump of the present invention will be described.

Squeeze pump cars Until the 1995 Great Hanshin Earthquake, squeeze pump cars were mainly used.
Since then, however, the Building Standards Law has been strengthened to become today's ready-mixed concrete mix. For example, slump 15 cm, strength 210 kg / m3, aggregate 20 mm, cement amount 292 Kg / m3, this formulation is common in public works. This makes the squeeze pump useless when the amount of cement increases by 30-40% in winter. First of all, do not suck the ready-mixed concrete.

Hydrodynamics of rubber and ready-mixed concrete Pumps in tube pumps always have play between the hopper and the pumping point.
For example, if the inner diameter of the tube is 4 inches, the play can be 30 to 40 cm between the suction port and the squeeze roller.
Meanwhile, the raw concrete aggregate 20 mm advances toward the roller while rotating on the inner surface of the tube.
At the same time, the tube pump does not balance the speed of sucking ready-mixed concrete with the speed of 20 mm of aggregate, and the separation of ready-mixed concrete begins because air, water, and mortar advance from the ballast (aggregate).
In other words, the lighter ones go ahead and the heavy ones are left behind.

JP 2001-41177 A

  The tube pump according to the present invention has been proposed in view of the above-mentioned problems. The flow rate is reduced as much as possible on the suction side of the ready-mixed ready-mixed concrete, and the aggregate 20 An object of the present invention is to improve the durability of the tube by preventing the solid mass from being caught in the rotating squeeze roller by making it possible to balance the millimeter speed.

  In order to achieve the above object, a tube pump capable of pumping a slump of 8 centimeters in a vacuum squeeze pump vehicle according to the present invention includes a housing having an inner peripheral surface formed in a circular shape, and an inner peripheral surface of the housing. A squeeze roller having both ends projecting out of the housing and a squeeze roller that rolls along the inner peripheral surface of the housing to crush and close the tube, thereby rotating the lower side of the squeeze roller. One end of the tube protruding from the housing is used as a discharge port, and the other end is used as a suction port. The suction port is connected to the ready-mixed concrete supply portion, and the raw squeeze roller is rotated to rotate the ready-mixed concrete supply portion. In a tube pump configured to suck concrete into a tube and pump it to a discharge port, a squeeze roller is inserted from the suction port. By forming a flow assisting layer on the inner peripheral surface of the tube between at least part of the inner peripheral surface of the tube between the vicinity of the portion where the contact starts, and the inner peripheral surface substantially flush with the inner peripheral surface of the tube, The main feature is that 8cm ready-mixed concrete can be pumped.

  Further, the tube pump capable of pumping slump 8 centimeters with the vacuum squeeze pump vehicle according to the present invention is composed of a steel pipe in which the run-up auxiliary layer of ready-mixed concrete is bonded or fixed to the inner peripheral surface of the tube. The knitting yarn is characterized by the fact that a protective tube is provided in the vicinity of the suction port in the run-up auxiliary layer of ready-mixed concrete.

According to the tube pump capable of pumping a slump of 8 cm with the vacuum squeeze pump car of the present invention, at least one of the inner peripheral surface of the tube between the suction port and the vicinity of the portion where the squeeze roller starts to contact the tube. Since a running assistance layer for assisting the flow of ready-mixed concrete is formed in the section, the running resistance of the ready-mixed concrete passing through this running assistance layer is reduced.
Thereby, the passage speed of the ready-mixed concrete flowing through the suction port portion is increased, and there is an advantage that the efficiency of filling the ready-mixed concrete into the tube can be increased and the pump efficiency can be greatly improved.

In addition, since the speed of the ready-mixed concrete that flows through the suction port increases, solid lump is less likely to bite into the tube that is squeezed by the next squeeze roller, and damage to the tube due to biting of the lump. Can be prevented as much as possible.
Thereby, there exists an advantage which can improve the durability of a tube significantly.

In addition to the effects described above, the flow auxiliary layer is made of a steel pipe that is bonded or baked and fixed to the inner peripheral surface of the tube. There is a great effect.
1. The conventional pumping tube comes with hard ready-mixed concrete. The pumping tube in the pump body of the pump body cannot be pumped repeatedly, but by using a steel pipe (iron pipe) as in the present invention, ready-made concrete slump is used. Even if 8 cm hard ready-mixed concrete comes, it can be pumped as it is.

2. By using a steel pipe (iron pipe), the pumping capacity is increased and the pumping capacity of 10% of the tube pump of the same class is increased.
3. By using a steel pipe (iron pipe), the pumping capacity is increased, so when this is installed in a pump car and the tube pump is driven by the engine, the fuel can be saved by 10%.
4). By using a thin steel pipe (for example, an iron pipe having a wall thickness of 3 mm), the pumping capacity of 10% of the tube pump of the same class is increased. In addition, when the steel pipe is made of elasticity, the elastic restoring force can be used to pressure-feed with a hard concrete slump of 6 cm.

5. By attaching a steel pipe (iron pipe) to the suction port part of the tube, this part is reinforced, and when the steel pipe of the tube, replacement work such as pulling with the reinforced part can be performed, greatly increasing the time required for the work Can be reduced.
6). By using steel pipes (iron pipes), as described above, solid lump is less likely to bite into the tube that is squeezed by the squeeze roller. Can do 7. By using a steel pipe (iron pipe), as described above, the solid mass is less likely to bite into the tube squeezed by the squeeze roller, so that the durability of the pumping tube can be improved by about 20%.

  8). In the case where a protective tube is provided near the suction port in the run-up auxiliary layer of ready-mixed concrete, the protective tube causes inflow of a solid mass that is clogged in the tube or difficult to flow through the tube into the tube. Therefore, there is an advantage that it is possible to further improve the effect of preventing damage to the tube due to the biting of the solid mass as much as possible.

FIG. 3 is a partially cutaway front view of a tube pump according to the present invention. FIG. 3 is a longitudinal side view of a tube pump according to the present invention. These are the longitudinal cross-sectional front views of the principal part of the tube pump which concerns on this invention. These are the longitudinal cross-sectional front views of the tube of the suction opening part of the tube pump which concerns on this invention. These are the schematic explanatory drawings of the hardness test of a green concrete slump. These are the longitudinal cross-sectional front views which show the modification of the tube of the suction opening part of the tube pump which concerns on this invention.

  Hereinafter, the most preferred embodiment of the tube pump according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view in which a part of a tube pump according to the present invention is cut out, FIG. 2 is a longitudinal side view of the tube pump, and reference numeral 1 in the drawing indicates the tube pump as a whole.
The tube pump 1 is a concrete pump that pumps ready-mixed concrete (ready concrete) called concrete milk to a high place or a predetermined place, and includes a housing 2 having an inner peripheral surface formed in a circular shape, and an inner periphery of the housing 2. A flexible extruding tube 3 disposed along the surface and projecting from the housing 2 at both ends, and rolling along the inner peripheral surface of the housing 2 to crush and close the tube 3 1 and a squeeze roller 4 rotating in the clockwise direction.

A lining 5 having substantially the same hardness as a resin constituting the squeeze roller 4 described later is applied to the inner peripheral surface of the housing 2, and the inner peripheral surface portion of the lining 5 pushes the tube 3 with the squeeze roller 4. It acts as the inner peripheral surface of the housing 2 to be crushed.
One end of the tube 3 protruding from the housing 2 on the lower rotation side of the squeeze roller 4 serves as a discharge port 6, and the other end serves as a suction port 7. This suction port 7 is connected to the ready-mixed concrete supply unit. At the same time, the discharge port 6 is connected to a feed pipe 9 that feeds ready-mixed concrete to a high place or a predetermined place.

The squeeze roller 4 is formed by a rolling wheel 10 provided with a relatively hard synthetic resin layer on its outer peripheral surface, and as shown in FIG. As shown in the figure, the frame 13 that is driven to rotate clockwise is provided at a position of 180 degrees via a contact pressure adjusting mechanism 14 so as to be rotatable.
On the lower side of the squeeze roller 4 in the rotational direction, a guide 15 is attached to the frame 13 to keep the tube 3 in a normal position by moving both sides of the tube 3.

As shown in FIG. 3, the ready-mixed concrete supply unit 8 connected to the suction port 7 portion of the tube 3 is provided with a stirring blade 18 inside a storage tank 17 that opens upward as a charging port 16, and the bottom of the tube 3 sucks the tube 3. A supply port 20 connected to the port 7 via a connecting pipe 19 is provided.
The agitating blade 18 rotates in the direction in which the ready-mixed concrete 21 in the storage tank 17 is fed to the suction port 7 (clockwise direction B in FIG. 3).

And in the suction port 7 part of the tube 3, the running assistance layer 22 which assists the flow of the ready-mixed concrete 21 is formed.
As shown in FIGS. 3 and 4, the flow assist layer 22 is formed of a thin steel pipe 23 attached to the inner peripheral surface of the tube 3 on the suction port 7 side, and the storage tank 17 side of the steel pipe 23 is formed. An attachment flange 24 for connecting to the connecting pipe 19 is provided at the end.
The inner diameter of the steel pipe 23 is equal to the inner diameter of the tube at the tip.

This is to prevent trouble when the clogging is eliminated by reversing the clogged portion by reversing the squeeze roller 4 of the tube pump to the suction port 7 side when clogging occurs in the tube. is there.
An extraction bracket 28 is attached between the attachment flange 24 and the end of the tube 3.
When the tube 3 is replaced, the extraction bracket 28 hooks a hook drawn out from a winch (not shown) to pull out the tube 3.

By using the bracket 28 to be pulled out in this way, the tube 3 can be easily replaced and the workability can be greatly improved.
The length L of the flow assisting layer 22 formed by the steel pipe 23 is a length from the mounting flange 24 portion to the vicinity of the position where the rotating squeeze roller 4 first contacts the tube 3 as shown in FIG. It is.
In addition, instead of the steel pipe 23, the flow assisting layer 22 can be formed of a hard synthetic resin pipe 22 having good slippage.

Incidentally, the meaning of “near” in the length L of the flow assisting layer 22 is formed by a thin metal tube having elasticity such as phosphor bronze instead of the steel pipe 23 forming the flow assisting layer 22. In some cases, the end of the metal tube on the housing 2 side is formed beyond the position C (the position indicated by the triangular mark in FIG. 3) where the squeeze roller 4 first contacts the tube 3 for extrusion. When the flow assisting layer 22 is formed of a steel pipe 23 or a hard synthetic resin pipe that undergoes plastic deformation, the end of the steel pipe 23 or the hard synthetic resin pipe on the housing 2 side is the squeeze roller. It is necessary to provide a space S at least equal to or greater than the thickness t of the tube 3 between the position 4 and the position C where the 4 first contacts the tube 3 for extrusion.
This is to prevent the tube 3 from being damaged by being sandwiched between the steel tube 23 or the hard synthetic resin tube and the squeeze roller 4.

Next, the operation of the flow assisting layer 22 of the tube pump 1 configured as described above will be described.
First, when the ready-mixed concrete 21, which is generally referred to as ready-mixed, is supplied into the storage tank 17, it is supplied while being stirred and solidified by the rotation of the stirring blades 18 provided inside the storage tank 17. It is fed from the port 20 to the suction port 7 of the tube 3 through the connecting pipe 19.
On the other hand, the squeeze roller 4 is driven to rotate clockwise as indicated by the arrow A in FIG. 1 via the transmission gear mechanism 12 by the hydraulic motor 11, and the squeeze roller 4 is counterclockwise as indicated by e in FIG. When rotating further in the clockwise direction A past the contact position C while rotating around, the tube 3 held at the normal position by the guide 15 preceding the squeeze roller 4 is gradually crushed, and as shown in FIG. The tube 3 is closed at the position of the squeeze roller 4 in the solid line diagram.

When the squeeze roller 4 moves in the clockwise direction A while rotating counterclockwise e due to further rotation of the frame 13, the closed point also moves, and this closed point moves, so that the downstream side The ready-mixed concrete 21 confined in the tube 3 is pumped to the discharge port 6 side.
The tube 3 on the upper side than the closed point is once crushed at the point where it is crushed and closed, but when the squeeze roller 4 rotates and passes, the inside of the tube 3 is elastically elastic. It swells in a circular shape and returns.
The tube on the upper side from the closed point by the elastic restoring force of the tube 3 and the feeding force that feeds the ready-mixed concrete 21 in the storage tank 17 to the suction port 7 side by the rotation of the stirring blade 18 in the storage tank 17. 3, the ready-mixed concrete 21 is sucked and filled.

At this time, a flow assist layer 22 made of a thin steel pipe 23 is formed on the suction port 7 side portion of the tube 3, and the flow assist layer 22 allows the raw suction from the storage tank 17 into the tube 3. Since the flow resistance of the concrete 21 is small and it is sucked immediately, the filling efficiency is increased.
And since the inflow speed attracted | sucked in the tube 3 from the storage tank 17 is quick, it is less likely that the solid lump contained in the ready-mixed concrete 21 bites into the part crushed by the squeeze roller 4.
As a result, for example, as shown in FIG. 5, it is possible to pump the ready-mixed concrete slump 8, which is harder than the ready-mixed concrete slump 15, which is conventionally considered to be the limit of pumping.
The durability of the tube 3 is greatly improved by preventing damage to the tube 3 due to the biting of the solid mass as much as possible.

In addition, what is shown in FIG. 6 attaches the steel pipe 25 of a shorter dimension to the inner peripheral surface of the flow auxiliary layer 26 formed of the thin steel pipe 23 at the suction port 7 side portion of the tube 3 in the above embodiment. By providing the protective tube 26, the end of the flow assisting layer 22 on the side of the ready-mixed concrete supply unit 8 is narrowed down to a small diameter.
Thus, when the flowing auxiliary layer 22 is narrowed to a small diameter by the protective tube 26, there is a large solid mass in the ready-mixed concrete 21 that may be clogged in the flowing auxiliary layer 22 or the tube 3 being pumped. In this case, the large solid mass can be removed in advance before entering the suction port 7 of the tube 3.

  Incidentally, although the drawer bracket 28 is omitted in FIG. 6, it can be provided, and a mounting bolt insertion hole (not shown) of the mounting flange 24 is used as the drawer bracket 28. It is also possible to do.

In other words, if the mixed large solid matter is clogged in the tube 3, the tube 3 is not only damaged, but the tube 3 is taken out of the housing 2 and cleaned in order to remove the clogged solid matter, or a new tube 3 is attached. It must be replaced, which is time consuming and uneconomical.
Such a problem often occurs when the concrete stuck to the storage tank 17 collapses and enters into the ready-mixed concrete 21 in the storage tank 17, but the provision of the protective tube 26 solves such a problem. be able to.

  In addition, as shown in FIG. 5, in the case where a protective pipe 26 made of a shorter steel pipe 25 is provided on the inner peripheral surface of the thin steel pipe 23 forming the flow auxiliary layer 26, the portion of the flow auxiliary layer 26 of this portion is provided. Since it is reinforced, the tube 3 can be fixed to the reinforced portion of the flow assisting layer 26 by the fixing band 27 instead of the embodiment in which the tube 3 is adhered to the steel pipe 23 of the flow assisting layer 26. .

DESCRIPTION OF SYMBOLS 1 ... Tube pump 2 ... Housing 3 ... Tube 4 ... Squeeze roller 6 ... Discharge port 7 ... Suction port 8 ... Ready-mixed concrete supply part 9 ... Feed pipe 15 ... Guide 17 ... Storage tank 18 ... Agitating blade 21 ... Ready concrete 22 ... Running auxiliary layer 26 ... Protection tube

Claims (4)

A housing having a circular inner peripheral surface, a flexible tube disposed along the inner peripheral surface of the housing and projecting from both ends of the housing, and rolling along the inner peripheral surface of the housing. A squeeze roller that rotates while crushing and closing the tube, and one end of the tube that protrudes from the housing on the lower rotation side of the squeeze roller serves as a discharge port and the other end serves as a suction port and suction. In the tube pump configured to suck the raw material in the raw material supply unit into the tube by connecting the port to the raw material supply unit and rotate the squeeze roller and pump it to the discharge port, the squeeze roller contacts the tube from the suction port By forming a flow auxiliary layer on the inner peripheral surface of the tube between the vicinity of the portion where the tube starts and the inner peripheral surface substantially flush with the inner peripheral surface of the tube, Slump 8 cm pumpable tube pump in vacuum squeeze pump wheel, characterized in that the cm ready-mixed concrete was pumpable   The tube capable of pumping a slump of 8 cm with a vacuum squeeze pump car according to claim 1, wherein the material flow auxiliary layer is formed of a steel pipe bonded or fixed to the inner peripheral surface of the tube. pump   3. A tube pump capable of pumping a slump of 8 cm in a vacuum squeeze pump car according to claim 1 or 2, wherein a protective tube is provided in the vicinity of the suction port in the material flow auxiliary layer.   3. A tube pump capable of pumping a slump of 8 cm with a vacuum squeeze pump car according to claim 1 or 2, wherein the raw material is ready-mixed concrete.

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