JP2020151853A - Water supply device on mixing device to make fresh concrete and mixing device to make fresh concrete - Google Patents

Abstract

To provide a mixing device to make fresh concrete in which measured water enters sufficiently into the depth of mixture materials piled in an entering corner space part of holes of a rotating drum and blockage of a discharge hole is prevented.SOLUTION: The a mixing device to make fresh concrete comprises an operation unit for input signals connected to a control unit, a drive source for water supply whose drive is controlled by control signals and which is connected to a water tank, a first direction water supply pipe that is connected to the water supply drive source and faces the opening of a rotating drum that stores mixture materials, a second direction water supply pipe whose connection end part is connected to the water supply pipe and insertion tip part opposes the vicinity of the inner surface of a bottom wall of the rotary drum in a state of being supported by a fixed shaft erected on a support part on the inner surface of the bottom wall part and a support part arranged outside the rotary drum and detection means which is arranged in the first direction water supply pipe, detects this flow rate, and is connected to the control unit. The discharge hole on the insertion tip part of the second direction water supply pipe is directed to either the inner surface of the bottom wall or the lower inner surface of a peripheral body, and a hardening prevention member is mounted so that the tip part of the discharge hole is not closed by hardened product materials.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water supply device and a kneading device for producing ready-mixed concrete in a kneading device for producing ready-mixed concrete. The present invention relates to a ready-mixed concrete-forming kneading device for kneading a kneading material to produce ready-mixed concrete by injecting a substantially fixed amount of kneading water and rotating a rotating drum, and a water supply device used for the kneading device. The water supply device is preferably mounted on a mixer truck.

The "kneading device for producing ready-mixed concrete" described in Patent Document 1 and Patent Document 2 is rotated by the driving force of a driving source, has an opening at one end on the upper side, and has a peripheral body portion continuous with the bottom wall portion on the lower side. An inclined rotary drum, a blade spirally fixed to the inner peripheral surface of the rotary drum, a support portion (bearing) fixedly provided at a substantially central portion of a bottom wall portion of the rotary drum, and the support portion (bearing). It is provided with a fixed shaft installed on a support portion such as a gantry or a support frame provided outside the rotating drum, or an inclined rotating shaft that rotates by the driving force of a rotating shaft driving device.

Further, the kneading device includes a water supply device that supplies a predetermined amount of water to the kneading material charged into the hollow portion of the inclined rotary drum via the piping portion.

Then, when the kneading material and the measuring water are kneaded, the kneading material is put into the inclined rotary drum in advance. In that case, the charged kneading material slides to the back of the rotary drum, and the kneading material is particularly collected around the inside corner space of the cavity of the rotary drum. Therefore, in consideration of the work site and the like, when the metering water is supplied to the cavity of the rotating drum at an appropriate time, the tip of the supply pipe constituting the piping portion of the kneading device is rotated in an inclined manner. Since it is located above the hopper of the opening of the drum, the metering water that has flowed into the inclined rotating drum through the hopper must permeate the kneading material from the surface side of the kneading material that can be seen from the cavity of the rotating drum. Don't get. As a result, the surface of the kneading material becomes film-like or lid-like (so-called lid phenomenon), and there is a problem that the kneading material does not penetrate deeply into the inner corner space of the cavity.

In order to solve this problem, Patent Document 3 includes a water supply device and a ready-mixed concrete-forming kneading device in the ready-mixed concrete-forming kneading device proposed by the applicant. With the water supply device, etc. in this ready-mixed concrete generation kneading device, the kneaded water can be permeated deep into the kneading material, but since the discharge port at the insertion tip of the water supply pipe is open, kneading is performed. During the process, the kneading material may enter the discharge port at the insertion tip, and the produced ready-mixed concrete may harden in the discharge port to block the discharge port at the insertion tip.

Japanese Unexamined Patent Publication No. 2012-228830 Japanese Unexamined Patent Publication No. 2015-24522 Japanese Unexamined Patent Publication No. 2017-209887

In view of the above-mentioned conventional drawbacks, the present invention sufficiently permeates the metering water deep into the kneading material deposited in the inner corner space of the cave formed on the inner surface of the bottom wall portion and the inner surface of the peripheral body portion of the rotating drum. This is to prevent the outlet from being blocked.

The water supply device in the ready-mixed concrete production kneading device of the present invention includes an operation unit for an input signal connected to a control unit, and a drive source for water supply whose drive is controlled by the control signal of the control unit and connected to a water supply tank. A first-way water supply pipe that connects to the water supply drive source and faces the opening of the rotary drum that stores the kneading material in the cavity, and a connection end connected to the first-way water supply pipe, and the rotary drum The insertion tip portion heads toward the vicinity of the inner surface of the bottom wall portion while being supported by a fixed shaft erected on the support portion on the inner surface of the bottom wall portion and the support portion arranged outside the rotating drum. The two-way water supply pipe is provided with a two-way water supply pipe, a detection means arranged in the first-way water supply pipe, and a detection means for detecting the flow rate of the first-way water supply pipe and connecting to the control unit, and inserting the second-way water supply pipe. The outlet at the tip points at least to either the inner surface of the bottom wall or the lower inner surface of the peripheral body, and the product is placed at the insertion tip so that the outlet is not closed by the hardening phenomenon of the product. It is characterized by having an anti-curing member attached.

The product hardening prevention member is preferably an elastic (including flexible) tubular member in the same direction as the discharge port.

In the above configuration, the second stirring blade is fixed to at least the tip of the fixed shaft (including the portion near the tip) so as to extend outward from the rotating drum, and the second direction water supply pipe is fixed to the fixed shaft. It is characterized in that the insertion tip portion passes through the second stirring blade so as not to swing with respect to the fixed shaft. Further, the second direction water supply pipe is supported along a fixed shaft, and at least the insertion tip thereof extends to near the inner surface of the bottom wall portion through either a notch or a through hole formed in the second stirring blade. It is characterized by being.

Further, the ready-mixed concrete-forming kneading device of the present invention includes a rotating drum that is rotated by the driving force of the first drive source, has an opening at one end on the upper side, and has a peripheral body portion continuous to the bottom wall portion on the lower side. A blade spirally fixed to the inner peripheral surface of the rotating drum, a fixed shaft erected on a support portion of the bottom wall portion of the rotating drum and a support portion provided outside the rotating drum, and the rotation. Water supply of the water supply device in a ready-mixed concrete generation kneading device including a water supply tank for supplying water to the kneading material charged into the cavity of the drum, a water supply drive source, and a water supply device including a water supply pipe. The pipe is connected to the water supply drive source and is connected to the first-way water supply pipe toward the opening of the rotary drum, and the connection end is connected to the first-way water supply pipe, and is supported by the fixed shaft. , The insertion tip is composed of a second-way water supply pipe that goes toward the vicinity of the inner surface of the bottom wall, and the discharge port of the insertion tip of the second-way water supply pipe is at least the inner surface of the bottom wall or the peripheral body. It is characterized in that it faces any of the inner surfaces of the lower portion and a product hardening prevention member is attached to the insertion tip portion so that the discharge port is not closed due to the hardening phenomenon of the product.

Further, the ready-mixed concrete-forming kneading device of the present invention includes a rotating drum that is rotated by the driving force of the first drive source, has an opening at one end on the upper side, and has a peripheral body portion continuous to the bottom wall portion on the lower side. A blade spirally fixed to the inner peripheral surface of the rotary drum, a hollow fixed shaft erected on a support portion of the bottom wall portion of the rotary drum and a support portion provided outside the rotary drum, and the above. In a kneading device for producing ready-mixed concrete, which comprises a water supply tank for supplying water to the kneading material charged into the cavity of the rotary drum, a drive source for water supply, and a water supply device including a water supply pipe, the water supply device The water supply pipe is connected to the water supply drive source and is connected to a first-direction water supply pipe toward the opening of the rotary drum, and one end is connected to the first-direction water supply pipe and a part of the second-direction water supply pipe 13. It is composed of a fixed joint that is also used and a hollow fixed shaft that also serves as a portion of the second-way water supply pipe 13 and is connected to the fixed joint, and the tip portion having an outlet of the hollow fixed shaft is at least. A product hardening prevention member is attached to the insertion tip so that the discharge port is not closed due to the hardening phenomenon of the product while facing either the inner surface of the bottom wall portion or the lower inner surface of the peripheral body portion. It is a feature.

Further, the ready-mixed concrete-forming kneading device of the present invention includes a rotating drum that is rotated by the driving force of the first drive source, has an opening at one end on the upper side, and has a peripheral body portion continuous to the bottom wall portion on the lower side. , A blade spirally fixed to the inner peripheral surface of the rotary drum, a support portion of the bottom wall portion of the rotary drum, and a support portion provided outside the rotary drum are erected and driven for a rotary shaft. Ready-mixed concrete production consisting of a rotating shaft that rotates by the driving force of the source, a water supply tank that supplies water to the kneading material charged into the cavity of the rotating drum, a water supply device that includes a water supply drive source and a water supply pipe. In the kneading device, the water supply pipe of the water supply device is connected to the water supply drive source and has a first-direction water supply pipe toward the opening of the rotary drum and a connection end to the first-direction water supply pipe. It is connected and is supported by a support portion provided at least outside the rotating drum, and the insertion tip portion comprises a second-direction water supply pipe that goes toward the vicinity of the inner surface of the bottom wall portion. The outlet at the insertion tip of the two-way water supply pipe faces at least either the inner surface of the bottom wall or the lower inner surface of the peripheral body, and the outlet is not closed due to the hardening phenomenon of the product. It is characterized in that a product hardening prevention member is attached to the insertion tip.

In addition, the ready-mixed concrete-forming kneading device of the present invention is a rotating drum that is rotated by the driving force of the first drive source, has an opening at one end on the upper side, and has a peripheral body portion continuous to the bottom wall portion on the lower side. And, a blade spirally fixed to the inner peripheral surface of the rotary drum, a support portion of the bottom wall portion of the rotary drum, and a support portion provided outside the rotary drum are erected and used for the rotary shaft. A raw material consisting of a hollow rotating shaft that is rotated by the driving force of a driving source, a water supply tank that supplies water to the kneaded material charged into the cavity of the rotating drum, a water supply device that includes a water supply drive source and a water supply pipe. In the concrete-forming kneading device, the water supply pipe of the water supply device is connected to the water supply drive source and is connected to the first-way water supply pipe toward the opening of the rotary drum and the end connected to the first-way water supply pipe. It is composed of a fixed joint that is connected to the portion and also serves as a part of the second-way water supply pipe, and the hollow fixed shaft that also serves as the part of the second-way water supply pipe and is connected to the fixed joint. The outlet at the tip of the hollow rotating shaft faces at least either the inner surface of the bottom wall or the lower inner surface of the peripheral body, and the insertion is made so that the outlet is not closed due to the hardening phenomenon of the product. It is characterized in that a product hardening prevention member is attached to the tip portion.

(1) The invention according to claim 1 is, for example, when a driver operating a mixer car supplies measuring water to a cavity of a rotating drum at an appropriate time in consideration of a work site or the like, the present invention is timely measured. Water can be supplied to the rotating drum, and the discharge port at the insertion tip of the second-way water supply pipe that constitutes the piping portion is directed to at least one of the inner surface of the bottom wall portion and the lower inner surface of the peripheral body portion. Therefore, the problems of Patent Document 1 and Patent Document 2 can be solved (measurement water permeates deep into the kneading material deposited in the inner corner space of the cavity of the rotating drum). Therefore, the driver can efficiently produce ready-mixed concrete having good properties in a short time according to the work site and the like.
Further, since the product hardening prevention member is attached near the insertion tip portion, the problem of Patent Document 3 can be solved.
(2) In the invention according to claim 2, the second-direction water supply pipe does not shake even if the kneading material interferes during kneading.
(3) The invention according to claim 3 has the same effect as the invention according to claim 2.
(4) In the invention according to claim 4, the water supply pipe of the water supply device is connected to a drive source for water supply and is connected to a first-way water supply pipe toward the opening of a rotary drum and an end portion connected to the first-way water supply pipe. Consists of a second-way water supply pipe whose insertion tip heads toward the vicinity of the inner surface of the bottom wall while being supported by a fixed shaft, and the discharge port of the insertion tip of the second-way water supply pipe. Is oriented at least on the inner surface of the bottom wall portion or the lower inner surface of the peripheral body portion, so that the problems of Patent Document 1 and Patent Document 2 can be solved.
Further, since water can be supplied from the discharge end of the tubular member at the time of water supply and a product hardening prevention member that closes the tubular member at the time of kneading is attached, the problem of Patent Document 3 is solved. Can be done.
(5) The invention according to claim 5 can solve the problems of Patent Documents 1 to 3 with a simple configuration.
(6) In the invention according to claim 6, the water supply pipe of the water supply device is connected to a drive source for water supply and is connected to a first-way water supply pipe toward the opening of a rotary drum and an end portion connected to the first-way water supply pipe. The insertion tip is composed of a second-way water supply pipe that goes toward the vicinity of the inner surface of the bottom wall, at least while being supported by a support provided outside the rotating drum. Since the discharge port at the insertion tip of the water supply pipe points at least to either the inner surface of the bottom wall or the lower inner surface of the peripheral body, the rotating shaft is rotated by the driving force of the driving source for the rotating shaft after the ready-mixed concrete is formed. Even in the case of reverse rotation, the same effect as that of the invention according to claim 4 can be obtained.
(7) The invention according to claim 7 extends the second-direction water supply pipe to the vicinity of the bottom wall portion of the rotating drum via a support portion such as a support base and a support arm, as in the invention according to claim 6. There is no need to let it.

1 to 7 are explanatory views showing the first embodiment of the present invention (including a water supply device in a kneading device). 8 and 9 are explanatory views showing a second embodiment of the present invention. 10 to 12 are explanatory views showing a third embodiment of the present invention. 13 and 14 are explanatory views showing a fourth embodiment of the present invention.
Schematic diagram of a water supply device in a kneading device for producing ready-mixed concrete. Schematic diagram of the system of the water supply device. Schematic explanatory view from the side view which shows the state used for a mixer truck. Schematic explanatory view from a plan view which shows the state used for a mixer truck. Explanatory drawing which puts the kneading material into the rotating drum of the kneading apparatus installed on the loading platform of a mixer truck. FIG. 5 is a schematic explanatory view of a main part in which water is sprayed onto the kneading material at an appropriate time after the kneading material is added. The second direction water supply pipe of the water supply device is supported along a fixed shaft, and at least its tip extends near the inner surface of the bottom wall through either a notch or a through hole formed in the second stirring blade. Explanatory drawing of the state. The schematic cross-sectional explanatory view which shows the main part of the 2nd Embodiment of the kneading apparatus of this invention. Schematic cross-sectional explanatory view to the effect that the fixed joint 18 and the hollow fixed shaft 35A also serve as the second direction water supply pipe 13. Schematic cross-sectional explanatory view which shows the 3rd Embodiment of the kneading apparatus of this invention. Explanatory drawing of the main part (rotation axis). Explanatory drawing of the main part (drive source for a rotating shaft). Schematic cross-sectional explanatory view which shows 4th Embodiment of the kneading apparatus of this invention. Schematic diagram of the main part seen from a plan view.

Hereinafter, the present invention will be described in detail in accordance with the embodiments shown in the drawings for carrying out the present invention. 1 to 7 show a kneading device for producing ready-mixed concrete (hereinafter referred to as “kneading device Y”) and a water supply device for producing ready-mixed concrete used in the kneading device Y (hereinafter referred to as “water supply device X”). It is each schematic explanatory drawing of.). In particular, FIG. 1 is a schematic explanatory view of the water supply device X, and FIG. 2 is a schematic system explanatory view of the water supply device X.

The kneading device Y of the first embodiment includes the main part of the water supply device X, is rotated by the driving force of the first drive source 30, has an opening at one end on the upper side, and has a bottom wall on the lower side as described later. A rotating drum 31 having a peripheral body portion 31b continuous with the portion 31a, a blade 32 spirally fixed to the inner peripheral surface of the rotating drum, and a substantially central portion of the bottom wall portion 31a of the rotating drum are fixedly provided. It is provided with a support portion (bearing) 33 and a fixed shaft 35 fixedly erected on a support portion 34 such as a pedestal and a support frame provided outside the rotating drum.

As shown in FIGS. 1 and 2, the water supply device X includes a supply tank 3, a water supply drive source 4, a piping unit L provided with a detection means 14, an output unit 15 with a measuring instrument, and a measurement display unit. The water supply pipe including the control unit 1 having 16 and the operation unit 2 for input signals and constituting the piping unit L is connected to the water supply drive source 4 and is connected to the water supply drive source 4 and is supplied with water in the first direction toward the opening 31c of the rotary drum 31. The connection end portion is connected to the pipe 9 and the first-direction water supply pipe, and the insertion tip portion 13a is in the vicinity of the inner surface of the bottom wall portion 31a of the rotating drum 31 while being fixedly supported by the fixed shaft 35. The discharge port 19 of the insertion tip portion 13a of the second-direction water supply pipe is directed to at least one of the inner surface of the bottom wall portion and the lower inner surface of the peripheral body portion. A product curing prevention member 20 is attached to the insertion tip so that the discharge port 19 is not closed due to the curing phenomenon of the product.

First, the configuration of the water supply device X will be described with reference to FIGS. 1 to 7. The drive of the water supply device X is controlled by the control unit 1, the operation unit 2 for input signals connected to the control unit 1 either by wire or wirelessly, and the control signal of the control unit 1, and for example, a mixer car. A rotary drum 31 that connects to the water supply drive source 4 connected to the water supply tank 3 installed on the loading platform 21 of Z and the water supply drive source 4 and stores the kneading material 5 for producing ready-mixed concrete in the cavity 6. The first-direction water supply pipe 9 toward the opening 31c and the connection end on the opening 31c side are connected to the first-direction water supply pipe 9, and the support portion 33 on the inner surface of the bottom wall portion 31a of the rotary drum 31 and In a state of being supported by a fixed shaft 35 erected on a support portion 34 arranged outside the rotating drum 31, the insertion tip portion 13a of the insertion tip portion 13a heads toward the vicinity of the inner surface of the bottom wall portion 31a. The pipe 13 and the product hardening prevention member 20 are attached to the insertion tip portion so as to communicate with the discharge port 19 of the second direction water supply pipe 13 so that the discharge port 19 is not closed due to the hardening phenomenon of the product. , A detection means 14 arranged in the first direction water supply pipe 9 and detecting the flow rate of the first direction water supply pipe 9, and a measuring instrument that outputs a detection signal detected by the detection means 14 to the control unit 1. An additional output unit 15 and a water supply valve 17 arranged in the first-direction water supply pipe 9 and which can be opened and closed manually or by electromagnetic means are provided. And preferably, a measuring display unit 16 for displaying the injection flow rate in a digital format is provided on the surface of the output unit 15 with a measuring instrument or the control unit 1.

Thus, the control unit 1 is a box-shaped control panel in the present embodiment, and is installed so as to be transportable in the driver's cab or the loading platform 21 of the mixer truck Z. Further, the control unit 1 has a calculation processing function, a timing function, a signal processing function, a storage function, a function of digitally displaying the amount of water W charged into the rotating drum 31 on the liquid crystal screen, and the like. Preferably, a measurement display unit 16 is provided on the surface of the box-type control panel 1, and the amount of water flowing through the first-direction water supply pipe 9 is displayed on the measurement display unit 16 as an electrical signal (digital signal) relating to the flow rate. Will be done.

The input signal operation unit 2 is formed in a vertically long box shape having a size that allows the driver to carry it with one hand, and a remote control type is preferably adopted. Therefore, although not particularly shown, the surface of the input signal operation unit 2 includes a first drive source start button, a water supply drive unit start button, each stop button in the case of a manual type, and other operation buttons. A power ON / OFF display unit, a digital weighing display unit, and the like are provided. When signals are exchanged by wire between the control unit 1 and the input signal operation unit 2, an external input terminal unit is connected to the circuit board of the control unit 1.

For example, as shown in FIGS. 3 and 4, the water supply drive source 4 including the water supply tank 3, the electric motor, and the high-pressure pump is located on the front side, the side end side, etc. of the loading platform 21 of the mixer truck Z so as not to interfere with the rotating drum 31. It is arranged at an appropriate position.

Here, the term "piping portion L" is used. In this piping portion L, a connecting pipe connecting the water supply tank 3 and the high-pressure pump of the water supply drive source 4 and a connecting pipe arranged outside the rotary drum 31 are arranged at the base end. The first-direction water supply pipe 9 in which the portion 9a is connected to the discharge portion of the high-pressure pump and the connection end portion 9b is fitted to one end of the elbow-shaped fixed joint 18, and the other end of the fixed joint 18. The above-mentioned second-direction water supply pipe 13 that fits into the portion is included. By the way, the first-direction water supply pipe 9 and the second-direction water supply pipe 13 are each composed of one or a plurality of pipes. Therefore, when there are a plurality of water supply pipes 9 and 13, the "first direction water supply pipe 9" and the "second direction water supply pipe 13" are distinguished based on the popper 22 or the last fixed joint 18 described later. Shall be.

In FIG. 2, for convenience of explanation, the upstream side is distinguished from the first direction water supply pipe 9 and the downstream side is distinguished from the second direction water supply pipe 13 with reference to the joint 18 located in the middle of the piping portion L. Here, the joint 18 is also included in the concept of the second direction water supply pipe 13. For example, as shown in FIG. 6, the first-direction water supply pipe 9 is mainly fixedly arranged outside the rotating drum 31 with reference to the joint 18 penetrating the peripheral wall of the hopper 22 shown by the virtual line. On the other hand, the second direction water supply pipe 13 is mainly housed in the rotating drum 31, and in the present embodiment, the wire, the tightening ring, and the tightening ring are provided along the fixed shaft 35 and not separated from the fixed shaft. It is integrally fixed to the fixed shaft 35 via a fixing means such as welding.

By the way, the first-direction water supply pipe 9 includes a first pipe portion that is substantially horizontal to the horizontal installation surface of the loading platform 21 and a second pipe that extends upward from the rear end portion of the first pipe portion in a substantially vertical state. It has a portion, and the upper end portion of the second pipe portion is connected to one end portion of the fixed joint 18 described above. On the other hand, in the second direction water supply pipe 13, the connection end portion 13b on the upper end side protruding from the opening 31c of the rotary drum 31 is connected to the other end portion of the fixed joint 18, while the insertion tip portion 13a thereof is said. It extends linearly to the vicinity of the inner wall surface of the bottom wall portion 31a of the rotating drum 31.

In the present embodiment, the long plate-shaped second stirring blade 36 is fixed to at least the tip end portion (including the portion near the tip end portion) of the inclined fixed shaft 35 so as to extend outward from the rotary drum 31. The directional water supply pipe 13 is fixed to the inclined fixed shaft 35, and the insertion tip portion 13a having the discharge port 19 is the long plate-shaped second stirring blade so as not to swing with respect to the inclined fixed shaft 35. (See FIG. 7).

Further, the second-direction water supply pipe 13 is supported along the inclined fixed shaft 35, and at least the insertion tip portion 13a passes through either the notch or the through hole 36a formed in the long plate-shaped second stirring blade 36. Then, it extends to near the inner surface of the bottom wall portion 31a. As described above, in the present embodiment, the insertion tip portion 13a of the second-direction water supply pipe 13 is formed by being slightly bent downward, and the discharge port 19 is at least the inner surface of the bottom wall portion 31a of the rotary drum 31 or the peripheral body portion 31b. It points to one of the lower inner surfaces. Therefore, the water W jetted from the discharge end portion 20a of the product hardening prevention member 20 communicating with the discharge port 19 hits, for example, the inner surface of the bottom wall portion 31a and flows down.

A flexible product hardening prevention member 20 having a predetermined length is attached to the insertion tip portion 13a of the second-direction water supply pipe 13 in an externally fitted state so as to communicate with the discharge port 19. In the present embodiment, the product hardening prevention member 20 is an elastic (including flexible) tubular member 20, and is formed in a substantially circular tubular shape by an elastic resin such as vinyl, and if necessary, the outer circumference thereof. A reinforcing member such as a wire is provided near the surface.

The elastic cylinder member 20 is attached so that one end thereof is externally fitted near the insertion tip portion 13a so that the inside communicates with the discharge port 19, and the elastic cylinder member 20 is normally or At least during kneading (a state in which the kneading material or the like is charged into the rotary drum 31 and the rotary drum 31 or the like is rotating), the kneading material or the like does not flow back inside the elastic cylinder member 20, and is in an open state when water is supplied. The hardness and length are such that water can be supplied from the other end (discharge end 20a).

That is, in the normal state or at least during kneading, the elastic tube member 20 bends from the insertion tip portion 13a due to the weight of the elastic tube member 20 or the weight of the kneading material, the discharge end portion 20a is closed, and the kneading material is closed. Etc. do not flow back into the second-direction water supply pipe 13, and at the time of water supply, the elastic cylinder member 20 is straightened by water pressure, and the discharge end portion 20a of the elastic cylinder member 20 is expanded, so that the bottom wall portion 31a of the rotating drum 31 The water W sprayed on the inner surface or the lower inner surface of the peripheral body portion 31b flows down.

The elastic cylinder member 20 is attached in the vicinity of the insertion tip portion 13a in an externally fitted state, but for example, a joint or the like may be provided at the insertion tip portion 13a and the elastic cylinder member 20 may be attached via the joint.

Next, the detection means 14 as a flow rate sensor is provided in the middle of the first-direction water supply pipe 9. Although the specific configuration of the detection means 14 is omitted, for example, the front and rear of the orifice in the first-direction water supply pipe 9 are the primary side pressure and the secondary side pressure, and a pair of pressure chambers formed on both sides of the diaphragm. The displacement of the diaphragm caused by the differential pressure can be detected by using a magnetic material, a magnetic detection element, or the like, and the displacement can be converted into an electrical signal related to the flow rate.

Next, the output unit 15 with a measuring instrument receives the signal detected by the detecting means 14, measures the electrical signal as a flow rate, and outputs the information to the control unit 1. Therefore, the output unit 15 with a measuring instrument also has an arithmetic processing function, a timekeeping function, a detection signal processing function, and the like, like the control unit 1.

By the way, the reason why the kneading device Y requires the output unit 15 with a measuring instrument is that the ratio of the kneading material 5 charged into the rotary drum 31 and the measuring water W (also simply referred to as “water”) is set to a constant ratio. Because it is important. That is, the amount of water supplied is adjusted so that the amount of water W contained in the ready-mixed concrete to be generated is substantially constant each time the ready-mixed concrete is manufactured, and moreover, as in the present embodiment, with respect to the kneading material 5. When the measured water W is sprayed from the discharge end portion 20a, the water W penetrates deep into the inclined rotating drum 31, and as a result, the properties are stabilized in a short time around the inside corner space portion 6a. It is possible to produce high quality ready-mixed concrete.

Further, since the elastic cylinder member 20 is in a state in which the kneaded material or the like does not flow back into the second direction water supply pipe 13 due to its own weight or the weight of the concrete material or the like during kneading, the generated ready-mixed concrete is discharged at the discharge end portion 20a. It can be prevented from hardening and can be used without maintenance such as removing concrete lumps at the next use.

As described above, since the elastic cylinder member 20 is closed at the time of kneading, ready-mixed concrete or the like does not flow back into the elastic cylinder member 20, but it is a case where the elastic cylinder member 20 is blocked. However, since ready-mixed concrete or the like does not adhere to the second-direction water supply pipe 13, it is only necessary to replace the elastic cylinder member 20, and maintenance can be performed more easily than when the concrete lump is removed.

Here, the configuration of the kneading device Y will be described with reference to FIGS. 5 and 6. The specific configuration of the kneading device Y is a well-known matter as described in Patent Document 1 and Patent Document 2, and will be briefly described here.

As described above, reference numeral 30 denotes a first drive source, and the first drive source may be a drive source for the mixer truck Z (for example, the third embodiment of FIGS. 9 to 11 of Patent Document 1), but this embodiment In, a first drive source (for example, the first embodiment of Patent Document 1 and Patent Document 2) that is separate from the drive source of the mixer truck Z is adopted.

Therefore, the first drive source 30 for rotationally driving the rotary drum 31 is a hydraulic motor support base 38 fixed to the central portion in front of the support member 37 fixed to the tip end portion on the driver's cab side of the loading platform 21, and the hydraulic pressure thereof. A hydraulic motor 39 attached to a motor support, a rotary drum support 41 having rollers 40 on the upper surface fixed to portions near both ends behind the support member 37, and a drive shaft 39a of the hydraulic motor 39. It is composed of and.

The rotary drum 31 may be installed on the ground, but in this embodiment, as shown in FIGS. 3 and 4, it is preferably a mixer truck Z. That is, similarly to a general mixer truck Z, the rotary drum 31 is tiltedly installed on the loading platform 21 via a plurality of supports. The rotary drum 31 has a substantially via barrel shape with an opening at one end in the vertical cross section, and has a bottom wall portion 31a, a peripheral body portion 31b continuous with the bottom wall portion, an opening 31c in which the hopper 22 is positioned, and the peripheral body portion 31b. The lower wall surface of the peripheral body portion 31b of the cavity portion 6 and the bottom surface portion of the inner wall intersecting the lower wall surface of the bottom wall portion 31a are formed of a roller ring 31d provided around the portion near the opening, and the inner wall bottom surface portion thereof becomes an entrance space 6a. As shown by 5, the kneading material 5 fluidly accumulates around the inside corner space 6a.

Thus, the rotating drum 31 that rotates in the forward and reverse directions by the driving force of the first driving source 30 has a spiral blade 32 that is totally fixed to its inner peripheral surface. In the embodiment, the tilted fixed shaft 35 has a support portion (bearing) 33 erected at a substantially central portion of the bottom wall portion 31a of the rotary drum 31, and both ends erected on the outer support portion 34. The fixed shaft 35 is located on the substantially central axis of the rotating drum 31. Of course, it is not an essential matter of the invention that the tilted fixed shaft 35 is located on the substantially central axis of the rotating drum 31, so that it may be provided at a slightly eccentric position.
In the embodiment, a single or a plurality of long plate-shaped second stirring blades 36 are attached to the vicinity of the tip of the tilted fixed shaft 35 or a portion near the tip. At the time of kneading, the rotating drum 31 rotates in a predetermined direction (positive direction), but the tilted fixed shaft 35 integrally having the long plate-shaped second stirring blade 36 has an outer end portion appropriately attached to an outer support portion 34. Since it is fixed to, it does not rotate together with the rotating drum 31.

Depending on the direction of rotation of the spiral blade 32 integrated with the rotating drum 31, the kneading material 5 housed in the rotating drum 31 can be kneaded with a certain amount of water W to produce so-called ready-mixed concrete. After kneading, when the rotating drum 31 is rotated in the reverse direction, the produced ready-mixed concrete is moved in the direction opposite to the moving direction at the time of production by the spiral blade 32. Then, the moved ready-mixed concrete flows to the discharge chute S arranged in the opening 31c of the rotating drum 31.

In FIG. 5, reference numeral 43 is a crane, and 44 is a transport bag in which a required amount of kneading materials 5 such as gravel, sand, and cement are laminated in this order. When the transport bag 44 is lifted by a crane 43 or the like, positioned on the hopper 22, and the bottom surface of the transport bag 44 is opened, the kneading material 5 falls into the hopper 22, and the dropped kneading material 5 falls into the rotary drum 31. Get in. In this way, the kneading material 5 falls and moves to the back of the rotary drum 31 via the hopper 22, and the kneading material 5 accumulates around the inside corner space 6a of the cavity 6.

In the above configuration, the kneading material 5 may be put into the rotating drum 31 of the kneading device Y at a ready-mixed concrete manufacturing factory, or a storage place where the quality does not deteriorate until the ready-mixed concrete is used or used. You may do it with.

In any case, after the kneading material 5 is first put into the rotary drum 31, a substantially fixed amount of water W measured by the water supply device X passes through the piping portion L of the water supply device X to the bottom wall of the rotary drum 31. It is supplied to either the inner surface of the portion 31a or the lower inner surface of the peripheral body portion 31b via the second-direction water supply pipe 13. In the present embodiment, a substantially fixed amount of water W injected from the discharge end portion 20a of the elastic cylinder member 20 attached to the discharge port 19 at the tip end portion of the second-direction water supply pipe 13 hits the inner surface of the bottom wall portion 31a. It flows into the corners of the bottom wall 31a and the peripheral body 31b, and sufficiently penetrates into the kneading material 5 which is mainly stored in the corners 6a.

At this time, the elastic cylinder member 20 is forcibly opened even if the elastic cylinder member 20 is in the closed state by expanding the discharge end portion 20a by the water pressure of the water supplied through the second direction water supply pipe 13. It is ready to supply water.

In the present embodiment, the kneading device Y including the water supply device X is mounted on the mixer truck Z. Therefore, when the site where the ready-mixed concrete is used is near, for example, the driver is in the driver's seat and operates the input signal at an appropriate time. The operation button of the unit 2 is operated to supply the water of the water supply tank 3 into the rotary drum 31 via the piping unit L. In particular, if the site where the ready-mixed concrete is used is far away and it takes time, travel to a place where the site where the ready-mixed concrete is used can be reached in a preset time, and then use the water supply device X to roughly quantify the amount into the rotating drum 31. Water W is supplied and the kneading material 5 and water W are forcibly kneaded. Therefore, the driver can timely add water to the kneading material stored in the rotating drum 31 in view of the work situation at the site to produce "high quality ready-mixed concrete". There are advantages.

In the water supply device X of the present embodiment, a solenoid valve is preferably adopted as the water supply valve 17, and the opening and closing of the solenoid valve 17 is automatically "opened" when the water supply drive source 4 is started, while the water supply valve 17 is automatically opened and closed. The control unit 1 controls the valve so that it is automatically closed after a lapse of a predetermined time from the opening. Therefore, the control unit 1 having a microcomputer controls the amount of water supply (flow rate) with respect to the kneading material 5 charged into the rotary drum 31 based on the program recorded in the storage unit.

Further, when the water supply device X and the kneading device Y of the present embodiment are preferably applied to a "mixer truck", the driver can efficiently produce ready-mixed concrete having good properties in a short time according to the work site. Can be done.

Hereinafter, in this column, a second embodiment of the kneading device Y and a third embodiment of the kneading device Y will be described. In explaining the second embodiment and the like, the same parts as those of the first embodiment of the kneading device Y are designated by the same reference numerals, and duplicate description will be omitted.

8 and 9 are the second embodiment of the kneading device Y of the present invention, and the main difference between the second embodiment and the first embodiment of the kneading device Y is the inclined fixed shaft of the first embodiment. Reference numeral 35 denotes an inclined hollow fixed shaft 35A, and a substantially fixed amount of water is injected from a discharge port formed at the tip of the inclined hollow fixed shaft 35A. Therefore, as shown in the drawing, the fixed joint 18 and the hollow fixed shaft 35A also serve as the second direction water supply pipe 13. Further, in order to improve the stirring efficiency of the kneading material 5, the spiral second stirring blade 36A is fixed to the outer peripheral surface of the tip portion (including the portion near the tip portion) of the inclined hollow fixing shaft 35A. Further, as shown in FIG. 9, a notch 41 is formed in the lower portion of the spiral second stirring blade 36A in the outward radius direction, and the insertion tip portion 13a of the second direction water supply pipe 13 is passed through the notch 41. That is the point. The "spiral" configuration of the second stirring blade 36A can also be applied to that of the first embodiment.

Therefore, the ready-mixed concrete-forming kneading device Y of the second embodiment is rotated by the driving force of the first driving source 30, has an opening 31c at one end on the upper side, and is continuous with the bottom wall portion 31a on the lower side. A rotating drum 31 having a peripheral body portion 31b, a blade 32 spirally fixed to the inner peripheral surface of the rotating drum, a support portion (bearing) 33 of the bottom wall portion of the rotating drum, and an outside of the rotating drum. A hollow fixed shaft 35A erected on the support portion 34, a water supply tank 3 for supplying water W to the kneading material 5 for producing ready-mixed concrete put into the hollow portion 6 of the rotary drum, and a drive source for water supply. 4 and a water supply device including a water supply pipe (piping portion L).

Then, the water supply pipe of the water supply device is connected to the water supply drive source 4 and is connected to the first direction water supply pipe 9 toward the opening 31c of the rotary drum 31 and one end thereof to the first direction water supply pipe. It is composed of a fixed joint 18 that also serves as a part of the second-way water supply pipe 13 and the hollow fixing shaft 35A that also serves as that part of the second-way water supply pipe 13 and is connected to the fixed joint. The tip portion having the discharge port of the shaft 35A faces at least either the inner surface of the bottom wall portion 31a or the lower inner surface of the peripheral body portion 31b (claim 5). Therefore, in the second direction water supply pipe 13 of this second embodiment, the joint 18 and the hollow fixed shaft 35A are also used. Further, one or a plurality of discharge ports 19 are provided directly or via a branch pipe (included in the insertion tip portion) 13a, and an elastic cylinder member 20 is attached to each of the discharge ports 19.

10 to 12 are the third embodiment of the present invention (kneading device Y), and the main difference between the third embodiment and the first embodiment is that the inclined fixed shaft 35 of the first embodiment This is a point where the rotating shaft 35B is rotated by the driving force of the rotating shaft drive source 45. The rotating shaft 35B has a spiral second stirring blade 36A (using the reference numerals of the second embodiment as it is) similar to that of the second embodiment. In this respect, it is the same as "Rotating shaft 24, Rotating shaft driving device 25 (see FIG. 4 of Patent Document 1)" of Patent Document 1.

Therefore, the drive source 45 for the rotating shaft of the third embodiment is a hydraulic motor 46 installed on the upper surface of an outer support portion (for example, a support base) 34B, a transmission belt for transmitting the driving force of the hydraulic motor 46, and an endless chain. After producing ready-mixed concrete, the ready-mixed concrete can be rotated in the direction opposite to that at the time of kneading to promote the movement of the ready-mixed concrete to the opening 31c side of the rotating drum 31. it can.

The ready-mixed concrete-forming kneading device Y of the third embodiment is rotated by the driving force of the first drive source 30, has an opening 31c at one end on the upper side, and has a peripheral body portion continuous with the bottom wall portion 31a on the lower side. A rotary drum 31 having 31b, a blade 32 spirally fixed to the inner peripheral surface of the rotary drum, a support portion (bearing) 33 of the bottom wall portion of the rotary drum, and a blade 32 provided outside the rotary drum. For the rotating shaft 35B erected on the support portion (bearing on the drive source side) 34B and rotated by the driving force of the rotating shaft drive source 45, and the kneading material 5 charged into the cavity 6 of the rotating drum. It is composed of a water supply tank 3 for supplying water W, a water supply drive source 4, and a water supply device including a water supply pipe (pipe portion L).

Then, the water supply pipe of the water supply device X is connected to the water supply drive source 4 and the first direction water supply pipe 9 toward the opening 31c of the rotary drum 31 and the connection end portion connected to the first direction water supply pipe. At the same time, from the second direction water supply pipe 13 in which the insertion tip portion 13a is directed toward the vicinity of the inner surface of the bottom wall portion 31a while being supported by the support portion 34B provided at least outside the rotary drum 31. Therefore, the discharge port 13a at the insertion tip of the second-direction water supply pipe 13 points at least to either the inner surface of the bottom wall portion 31a or the lower inner surface of the peripheral body portion 31b (claim 6).

The support portion 34B for fixing the second-direction water supply pipe 13 provided outside the rotary drum 31 is preferably a support base 48 and a base end portion fixed to the support base 48 and a tip portion rotating. It includes a long rod-shaped support arm 49 that has entered the cavity 6 of the drum 31, and a fixing means for the second-direction water supply pipe 13 such as a locking ring and a wire (not shown).

Finally, FIGS. 13 and 14 show the fourth embodiment of the present invention (kneading device Y), and the main differences between the fourth embodiment and the first embodiment are the rotating shaft 35B of the third embodiment. It is a point that the configuration of the inclined hollow fixed shaft 35A of the second embodiment is combined while utilizing the drive source 45 for the rotating shaft. Therefore, for convenience, a member (for example, a rotary joint 51) that appropriately connects to the other end of the joint 18 corresponding to the second direction water supply pipe 13 by using the configuration of the drive source 45 for the rotary shaft as it is in the third embodiment. ) Is coded.

Since the hollow rotating shaft 35C of the fourth embodiment has a "long pipe shape", one or more outlets 19 are directly formed on a part of the peripheral wall at the tip thereof (a portion not blocked by the bearing). Alternatively, an elastic cylinder member 20 is attached to each of the discharge ports 19 provided via a branch pipe.

Therefore, the ready-mixed concrete-forming kneading device Y of the fourth embodiment is rotated by the driving force of the first drive source 30, has an opening 31c at one end on the upper side, and is continuous with the bottom wall portion 31a on the lower side. A rotary drum 31 having a peripheral body portion 31b, a blade 32 spirally fixed to the inner peripheral surface of the rotary drum, a support portion 33 on the bottom wall portion of the rotary drum, and a support provided outside the rotary drum. A water supply tank 3 that supplies water to the hollow rotary shaft 35C that is erected in the portion 34 and that rotates by the driving force of the rotary shaft drive source 45 and the kneading material 5 that is charged into the hollow portion 6 of the rotary drum. , A water supply device Y including a water supply drive source 4 and a water supply pipe.

Then, the water supply pipe of the water supply device Y is connected to the water supply drive source 4 and the first direction water supply pipe 9 toward the opening 31c of the rotary drum 31 and the connection end portion connected to the first direction water supply pipe. It is composed of a fixed joint 18 that also serves as a part of the second direction water supply pipe 13 and a hollow fixed shaft 35C that also serves as a part of the second direction water supply pipe 13 and is connected to the fixed joint 18. The discharge port 19 at the tip of the hollow rotating shaft 35C points at least to either the inner surface of the bottom wall portion 31a or the lower inner surface 31b of the peripheral body portion.

With this configuration, the configuration of the piping portion L is simplified, and as in the third embodiment, the second-direction water supply pipe 13 is connected to the bottom wall of the rotating drum 31 via the support portion 34 such as the support base and the support arm. It is not necessary to extend to the vicinity of the portion 31a.

The present invention is used for a kneading device for producing ready-mixed concrete and a mixer truck equipped with the kneading device.

X ... Water supply device,
1 ... Control unit,
2 ... Input signal operation unit,
L ... Piping section,
3 ... Water tank,
4 ... Drive source for water supply,
5 ... Kneading material,
6 ... Cavity,
9 ... 1st direction water supply pipe,
13 ... 2nd direction water supply pipe, 13a ... insertion tip,
14 ... Detection means,
15 ... Output unit with measuring instrument,
16 ... Weighing display unit,
17 ... Water supply valve,
18 ... Fixed fitting,
19 ... Discharge port,
20 ... Cylinder member,
Y ... Kneading device,
W ... Weighing water,
30 ... 1st drive source,
31 ... Rotating drum,
31a ... bottom wall, 31b ... peripheral body, 31c ... opening,
32 ... Blade,
33 ... Support (bearing),
34, 34B ... Outside support,
35 ... Fixed shaft,
35A ... Hollow fixed shaft,
35B ... Rotation axis,
35C ... Hollow rotating shaft,
36, 36A ... 2nd stirring blade,
41 ... Notch,
45 ... Drive source for rotating shaft,
34B ... Outside support,
48 ... Support stand,
49 ... Support arm,
51 ... Rotating joint,
Z ... Mixer truck,
21 ... Loading platform,
22 ... Hopper.

Claims (7)

The operation unit for input signals connected to the control unit, the drive source for water supply whose drive is controlled by the control signal of the control unit and connected to the water supply tank, and the drive source for water supply are connected, and the kneading material is hollowed out. A first-way water supply pipe toward the opening of the rotary drum to be housed in the portion, a connection end portion is connected to the first-direction water supply pipe, and a support portion on the inner surface of the bottom wall portion of the rotary drum and the outside of the rotary drum. The insertion tip portion is arranged in the second-direction water supply pipe and the first-direction water supply pipe in which the insertion tip portion is directed toward the vicinity of the inner surface of the bottom wall portion while being supported by the fixed shaft erected on the support portion arranged in. The discharge port at the insertion tip of the second direction water supply pipe is at least the inner surface of the bottom wall portion or the peripheral body portion, which is provided with a detection means for detecting the flow rate of the first direction water supply pipe and connecting to the control unit. For making ready-mixed concrete, which is directed to any of the lower inner surfaces of the pipe and has a product hardening prevention member attached to the insertion tip so that the discharge port is not closed due to the hardening phenomenon of the product. Water supply device in the kneading device. In claim 1, the second stirring blade is fixed to at least the tip of the fixed shaft so as to extend outward from the rotating drum, and the second direction water supply pipe is fixed to the fixed shaft and the same. A water supply device in a ready-mixed concrete-forming kneading device, wherein the insertion tip portion passes through the second stirring blade so as not to shake with respect to the fixed shaft. In claim 1, the second direction water supply pipe is supported along a fixed shaft, and at least the insertion tip thereof passes through either a notch or a through hole formed in the second stirring blade to form a bottom wall portion. A water supply device in a kneading device for producing ready-mixed concrete, which is characterized by extending close to the inner surface of the concrete. A rotating drum that rotates by the driving force of the first drive source and has an opening at one end on the upper side and a peripheral body portion that is continuous with the bottom wall portion on the lower side, and is spirally fixed to the inner peripheral surface of the rotating drum. Water with respect to the blade, the fixed shaft erected on the support portion of the bottom wall portion of the rotary drum, the support portion provided outside the rotary drum, and the kneading material charged into the cavity portion of the rotary drum. In a kneading device for producing ready-mixed concrete, which consists of a water supply tank for supplying water, a drive source for water supply, and a water supply device including a water supply pipe.
The water supply pipe of the water supply device is connected to the water supply drive source and the first-direction water supply pipe toward the opening of the rotary drum, and the connection end is connected to the first-direction water supply pipe and is connected to the fixed shaft. In the supported state, the insertion tip portion is composed of a second-direction water supply pipe that goes toward the vicinity of the inner surface of the bottom wall portion, and the discharge port of the insertion tip portion of the second-direction water supply pipe is at least the bottom wall portion. A mixture for producing ready-mixed concrete, which is oriented toward either the inner surface of the inner surface or the lower inner surface of the peripheral body, and has a product hardening prevention member attached to the insertion tip so that the discharge port is not closed due to the hardening phenomenon of the product. Smelting equipment. A rotating drum that rotates by the driving force of the first drive source and has an opening at one end on the upper side and a peripheral body portion that is continuous with the bottom wall portion on the lower side, and is spirally fixed to the inner peripheral surface of the rotating drum. With respect to the blade, the hollow fixed shaft erected on the support portion of the bottom wall portion of the rotary drum, the support portion provided outside the rotary drum, and the kneading material charged into the hollow portion of the rotary drum. In a kneading device for producing ready-mixed concrete, which consists of a water supply tank for supplying water, a drive source for water supply, and a water supply device including a water supply pipe.
The water supply pipe of the water supply device is connected to the water supply drive source and is connected to a first-direction water supply pipe toward the opening of the rotary drum, and one end is connected to the first-direction water supply pipe and a second-direction water supply pipe 13. The tip of the hollow fixed shaft having a discharge port of the hollow fixed shaft, which is composed of a fixed joint that also serves as a part of the above and a hollow fixed shaft that also serves as a part of the second direction water supply pipe 13 and is connected to the fixed joint. The portion faces at least one of the inner surface of the bottom wall portion and the lower inner surface of the peripheral body portion, and a product hardening prevention member is provided at the insertion tip portion so that the discharge port is not closed due to the hardening phenomenon of the product. Installed kneading device for producing ready-mixed concrete. A rotating drum that rotates by the driving force of the first drive source and has an opening at one end on the upper side and a peripheral body portion that is continuous with the bottom wall portion on the lower side, and is spirally fixed to the inner peripheral surface of the rotating drum. A blade, a rotating shaft erected on a support portion of a bottom wall portion of the rotating drum and a support portion provided outside the rotating drum, and rotated by the driving force of a driving source for the rotating shaft, and the rotating drum. In a kneading device for producing ready-mixed concrete, which consists of a water supply tank for supplying water to the kneading material put into the cavity of the above, a water supply drive source for water supply, and a water supply device including a water supply pipe.
The water supply pipe of the water supply device is connected to the water supply drive source and the first-direction water supply pipe toward the opening of the rotary drum, and the connection end is connected to the first-direction water supply pipe, and at least the rotary drum is connected. In a state of being supported by a support portion provided outside, the insertion tip portion is composed of a second-direction water supply pipe that goes toward the vicinity of the inner surface of the bottom wall portion, and the insertion tip portion of the second-direction water supply pipe. The discharge port is directed to at least either the inner surface of the bottom wall portion or the lower inner surface of the peripheral body portion, and the product hardening prevention portion is provided at the insertion tip portion so that the discharge port is not closed due to the hardening phenomenon of the product. A kneading device for producing ready-mixed concrete with attached members. A rotating drum that rotates by the driving force of the first drive source and has an opening at one end on the upper side and a peripheral body portion that is continuous with the bottom wall portion on the lower side, and is spirally fixed to the inner peripheral surface of the rotating drum. A blade, a hollow rotating shaft erected on a support portion of a bottom wall portion of the rotating drum and a support portion provided outside the rotating drum, and rotated by the driving force of a drive source for the rotating shaft, and the rotation. In a kneading device for producing ready-mixed concrete, which consists of a water supply tank for supplying water to the kneading material charged into the cavity of the drum, a water supply drive source for water supply, and a water supply device including a water supply pipe.
The water supply pipe of the water supply device is connected to the water supply drive source and the first direction water supply pipe toward the opening of the rotary drum, and the connection end is connected to the first direction water supply pipe and the second direction water supply. It consists of a fixed joint that also serves as a part of the pipe and the hollow fixed shaft that also serves as that part of the second-way water supply pipe and is connected to the fixed joint, and is a discharge port at the tip of the hollow rotating shaft. Is oriented at least on the inner surface of the bottom wall portion or the lower inner surface of the peripheral body portion, and a product hardening prevention member is attached to the insertion tip portion so that the discharge port is not closed due to the hardening phenomenon of the product. Kneading equipment for producing ready-made concrete.

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