JPH03169511A - Automatic cleaning device for inner wall of mixer tank for production of ready mixed concrete - Google Patents

Abstract

PURPOSE:To attain a condition in which the inner wall of a mixer tank is always cleaned, and eliminated the necessity of cleaning work to be done by workers by setting a rotating nozzle for ejecting cleaning water in the interior of the mixer tank and supplying water which is partly utilized as mixing water when a raw material is charged into the tank. CONSTITUTION:In a mixer tank 1, nozzles 20A, 20B for an automatic cleaning device are provided at two places in spaced relation to each other and are suspended from the upper wall 13 of the mixer tank. A rotating nozzle 23 in the automatic cleaning device 20 has a self-cleaning nozzle header 30 at its upper part connected to a cylinder rod 22 and also a driving unit 31 for nozzles for cleaning the inner wall of the tank at its lower part. The driving unit 31 is provided with a pair of nozzles 32A, 32B for cleaning the inner wall of the tank at the position projected from the side surface of said driving unit, and, furthermore, a self-cleaning nozzle 33 is mounted to the self-cleaning nozzle header 30 in order to clean these nozzles 32A, 32B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic cleaning device for the inner wall of a mixer tank for producing ready-mixed concrete. When mixing and producing ready-mixed concrete, the ready-mixed concrete jumps up and adheres to the inner wall of the tank, and it is necessary to remove and clean the attached ready-mixed concrete. It is to be removed.

2. Description of the Related Art Conventionally, no automatic cleaning device has been provided for cleaning the inside of a mixer tank by removing the fresh concrete adhering to the inner wall of the mixer tank.

Therefore, if necessary, workers open an opening in the tank after the mixer operation is complete, insert a gun-type high-pressure washer through the opening, and spray cleaning liquid toward the inner wall to remove the dirt that adheres to the wall. Cleaning work is underway to remove fresh concrete.

Problem to be Solved by the Invention Fresh concrete adhering to the inner wall of the tank will dry and solidify if left unattended, and will become quite thick, so in summer, when drying is quick, it is necessary to , It is necessary for a worker to spend a considerable amount of time cleaning with the above-mentioned high pressure washer several times a day. Furthermore, even in the winter when drying is slow, it is necessary for workers to clean after at least one day of operation work. In this way, if cleaning is not done every day, the fresh concrete will dry and solidify and build up, making it impossible to clean with a high-pressure washer, and the concrete must be removed with a large hammer, which can damage the tank's inner wall. It happens.

the above. Conventionally, cleaning work had to be done manually, and this work had to be done under harsh environmental conditions, resulting in labor problems.Furthermore, work downtime was extended, and machinery There was also the problem that the operating rate of the system was decreasing.

In order to solve the above-mentioned problems, the present invention automatically removes the ready-mixed concrete adhering to the inner wall of the tank without human intervention, and simultaneously cleans the inner wall of the tank while producing ready-mixed concrete during batch operation of the mixer. It is an object of the present invention to provide an automatic cleaning device that keeps the inner wall of the tank constantly cleaned, eliminates the need for cleaning work by an operator, and eliminates downtime of the machine due to the cleaning work.

Means for Solving the Problems Accordingly, the present invention installs a rotating nozzle inside the mixer tank that sprays cleaning water toward the entire inner wall, and when pouring cement, sand, and gravel during the production of ready-mixed concrete, clean water or To provide an automatic cleaning device for a mixer tank for producing ready-mixed concrete, in which a cleaning liquid consisting of mixing water or the like is supplied as the cleaning liquid to the above-mentioned rotating nozzle, and is used as part of the mixing water after cleaning the inner wall of the tank. .

The present invention further provides a self-cleaning system in which the rotating nozzle installed in the mixer tank sprays cleaning liquid toward the inner wall of the tank in order to clean the internal cleaning nozzle itself that sprays cleaning fluid toward the inner wall of the tank. It is preferable that the self-cleaning nozzle starts spraying the cleaning liquid from the self-cleaning nozzle to the tank inner wall cleaning nozzle at the same time as the mixing water is added.

Furthermore, in the present invention, the fresh concrete splashes up badly inside the mixer tank, and the fresh concrete also adheres to the rotating nozzle. It is characterized by preventing the mixing of fresh concrete into the concrete.

In addition, in order to prevent fresh concrete from adhering to the injection ports of the inner wall cleaning nozzle and self-cleaning nozzle, only when the cleaning liquid is injected from these nozzles, the injection ports are automatically opened by the water pressure of the cleaning liquid. It is preferable to provide an automatic clogging prevention means for the nozzle injection port to automatically close other than the above.

Furthermore, in the present invention, the drive mechanism for the rotary nozzle is such that the tank inner wall cleaning nozzle equipped in the drive mechanism has a longitudinal axis thereof with respect to a main axis arranged perpendicularly to the tank upper wall. The nozzle is rotated around a horizontal axis perpendicular to the vertical axis, and the cleaning liquid is sprayed in three-dimensional directions from the nozzle, and the cleaning liquid is sprayed in all directions on the inner wall of the tank. It is characterized by

Furthermore, the present invention is characterized in that the rotary nozzle is attached to the tip of the rod of the lifting cylinder and sprays the cleaning liquid in the three-dimensional direction while moving up and down.

Furthermore, the drive mechanism of the rotary nozzle and the cylinder utilize the water pressure of the supplied cleaning liquid as a drive source, making it unnecessary to provide a separate drive source.

The cleaning liquid injected from the above-mentioned tank inner wall cleaning nozzle and the cleaning liquid from the self-cleaning nozzle that injects the cleaning liquid towards the nozzle are used in set amounts as part of the kneading water that is metered and supplied during batch operation. metering and feeding cement, sand and gravel simultaneously when feeding into tanks;
(The spray from the self-cleaning nozzle is preferably supplied at the same time as the supply of the mixing water starts.) The mixing water is used at the same time as the washing liquid.

In the present invention, as described above, since an automatic cleaning device is provided that cleans the inner wall of the mixer tank while producing ready-mixed concrete, the inner wall of the tank can be constantly cleaned. In addition, since the process is performed while the mixer is running and part of the water used as kneading water (tap water or the kneading water itself) is used as the cleaning liquid, there is no need to discharge the cleaning liquid as waste water. There is no need to prepare separately. Furthermore, the rotating nozzle has a closed structure to prevent fresh concrete from entering inside.
Since the inner wall cleaning nozzle is cleaned by the self-cleaning nozzle, malfunction of the rotating nozzle can be prevented.

X Emperor Carp Hereinafter, the present invention will be explained in detail with reference to the drawings.

In Figure 1, which schematically shows the ready-mixed concrete production process, above a mixer tank 1 in which an automatic cleaning device according to the present invention is installed, a mixing water storage tank 2 and a cement storage tank 3 are installed. An aggregate tank 4 is installed that stores sand, gravel, and lightweight fine aggregate. Ready-mixed concrete is produced in batches using a known process, and usually the mixing water, cement, and aggregate are mixed into measuring machines 5, 6, and 7, respectively, during an operating time of about 40 seconds per batch. ,
8, and put it into the mixer tank 1.

The input raw materials are placed in the mixer tank 2.
The ready-mixed concrete is mixed with an axial force mixing blade (not shown in FIG. 1) and supplied to a concrete mixer truck 10 via a loading hopper 9.

As shown in FIGS. 2 and 3, the mixer tank 1 has a chute 12 for charging cement, sand, gravel, and lightweight aggregate connected to the upper wall 13 of the tank, and a mixing water supply pipe 14. Kneading water injection pipes 15 connected to the tank are arranged on both sides of the upper end inside the tank. In the lower part of the mixer tank 1, stirring blades 17A and 17B fixed to two sleeves 16A and 16B are arranged, and a loading hopper 9 is connected to the opening at the lower end.

The mixer tank! Inside, automatic cleaning device nozzles 20A and 20B according to the present invention are vertically installed at two locations spaced apart from the upper wall 13. The automatic cleaning device 2OA, 20
B (hereinafter referred to as automatic cleaning device 20 because they have the same configuration) has the structure shown in FIG. 4 and below, and the structure will be described in detail below.

In the automatic cleaning device 20, the upper end of a cylinder 2l for vertically extending and retracting is fixed to the inner surface of the tank upper wall l3, and a rotating nozzle 23 for spraying cleaning liquid is attached to the tip of a cylinder rod 22 protruding from the lower end thereof.

The cylinder 2l has a water supply port 21a bored at its upper end.
By introducing the cleaning liquid more selectively through the water supply port 2lb drilled at the lower end, the cylinder 21 is heated by the water pressure of the cleaning liquid.
A cylinder rod 22 sliding inside is raised and lowered. The cylinder rod 22 has a cylindrical shape, and supplies the cleaning liquid supplied into the cylinder 2l into a rotating nozzle 23 connected to its tip.

As schematically shown in FIG. 4, the rotary nozzle 23 is provided with a self-cleaning nozzle header 30 at an upper portion connected to the cylinder rod 22, and a drive mechanism 31 for a tank inner wall cleaning nozzle at a lower portion. The drive mechanism 31 has a pair of nozzles 32A for cleaning the inner wall of the tank at a position protruding from the side surface thereof.
, 32B, and a self-cleaning nozzle 33 is attached to the self-cleaning nozzle header 30 in order to clean these nozzles 32A, 32B. The above-mentioned nozzle 32A. Both 32B and 33 are wide-angle spray nozzles, and are structured to spray cleaning liquid over a wide range. In the figure, 34 is a drain hole.

The self-cleaning nozzle header 30 is composed of a large diameter portion of a cylindrical main shaft 35 fixed to the tip of the cylinder rod 22, and has an inverted L-shaped self-cleaning liquid supply tube 36 protruding from the side surface thereof. , the self-cleaning nozzle 33 is attached to its downwardly directed tip.

In the drive mechanism 31, a rotating body 40 and a fixed bevel gear 4K are fitted onto a small diameter portion of the main shaft 35, which is continuous with a large diameter portion, through O-rings. A horizontal shaft body 42 is rotatably attached to the rotating body 40 in a state of protruding orthogonally to the sides, and a rotating bevel gear 43 is fixed to the distal end side of the horizontal shaft body 42.

A bevel gear 43a is formed on the outer periphery of the inner side of the rotating bevel gear 43, and meshes with a bevel gear portion 41a formed on the outer periphery of the upper end of the fixed bevel gear 41.

Inside the horizontal shaft body 42, there is a cleaning liquid supply passage 42a that extends in the horizontal direction and communicates orthogonally with the cleaning liquid supply passage 35a provided at the axial center of the main shaft 35, and a cleaning liquid supply passage 42a that extends in the horizontal direction from the tip thereof (up and down in the figure). A branch supply path 42b extending in the direction) is formed. Nozzle arms 3 are installed at the tips of these branch supply paths 42b.
8A, 38B, and the tank inner wall cleaning nozzle 32A. 32B is installed.

A fixed bevel gear 4 connected to the lower end of the rotating body 40 and fitted onto the main sleeve 35! A drive nozzle 45 is provided protruding from the lower end thereof, and a liquid supply path 4lb is provided that communicates the cleaning liquid supply path 35a of the main Idl 35 with the drive nozzle 45. Further, at the lower end of one side of the fixed bevel gear 4l, two stages of large and small spur gears 46 are rotatably protruded via bearings, and at the lower end of the other side, an idle gear 47 is rotatably provided via bearings. It is installed protrudingly. The idle gear 47 has a pinion 48 protruding from the upper surface of the fixed bevel gear 4l at the upper end of its support shaft.
The pinion 48 is configured to rotate in accordance with the rotation of the pinion 7. The pinion 48 meshes with a gear 49 formed on the outer periphery of the lower end of the rotating body 40.

The main shaft 35 is a part that protrudes downward from the fixed bevel gear 4l.
, two upper and lower spar gears 50 are rotatably attached via bearings, and a rotary blade support member 51 having a gear 51a formed on the outer periphery is rotatably attached to the lower part of the spar gears 50 via bearings. A rotor blade 52 is fixed to the lower end of the rotor support member 5l, and the liquid flow injected from the drive nozzle 45 hits the rotor blade 52, causing the rotor blade 52 to rotate.

The drive mechanism 31 will malfunction if fresh concrete adheres to it, so the drive mechanism 31 is of a closed type and is sealed with a cover to the extent that the operation is not inhibited. That is, the rotating body 40, the fixed bevel gear 411 & the shaft body 42, and the rotary blade 52 at the lower end are sealed and surrounded by the cover 60. The force t<
-6O is fixedly attached to fixed bevel gear 4I, main M35
, the rotating body 40 and the horizontal shaft body 42 are surrounded with a gap in order to enable them to freely operate. Further, the upper surface of the cover 60 is completely surrounded by a cover 61 fixed to the outer periphery of the self-cleaning nozzle header 30,
Mixing of fresh concrete into the inside of the drive mechanism 31 from the connection part between the self-cleaning nozzle header 30 and the drive mechanism 31 is reliably prevented. Furthermore, a cover 62 is also attached to the rotating bevel gear 43 to which the tank inner wall cleaning nozzles 32A and 32B are attached.

Furthermore, in order to prevent ready-mixed concrete from adhering to the injection ports of the tank inner wall cleaning nozzles 32A, 32B and the self-cleaning nozzle 33, making injection impossible, the injection ports are opened when the cleaning liquid is injected, and the injection ports are opened at all times other than during injection. An automatic clogging prevention means for closing is provided as shown in FIG. 6 (AXB). That is, the injection pipe 66 is connected to the nozzle casing 65 by the spring 67.
A valve body 68 is fixedly attached to the nozzle casing 65 at a position facing the injection port 66a at the tip of the injection pipe 66.

Therefore, when the water pressure of the cleaning liquid supplied to the injection pipe 66 does not act, it is biased by the spring 67 and
), and the injection port 66a is closed by the valve body 68. On the other hand, when the cleaning liquid is injected, the injection pipe 66
Since water pressure acts on the gap 69 between the injection pipe W66 and the valve body 68, the injection pipe 66 moves to the right against the spring 67 as shown in FIG. The gap becomes larger and the injection port 66a is kept open.

As shown in FIG. 7, the rotary nozzle 23 having the above structure is supplied with cleaning water via a pump 72 from a cleaning water storage tank 7l connected to the cylinder 2l via a water supply pipe 70. Since the washing water uses part of the mixing water used during concrete production, the washing water storage tank 7l is connected to the mixing water storage tank 2, and a part of the mixing water is pumped in a set amount at a set time through the rotating nozzle. 23.

In the automatic cleaning device 20, in the drive mechanism 31, the cleaning liquid supplied from the cylinder 2l to the main shaft 35 via the cylinder rod 22 is transferred from the liquid supply path 35a of the main shaft 35 to the horizontal shaft body 42, the rotating bevel gear 43, and the nozzle arm. 38A, 38
The cleaning liquid is supplied to the cleaning liquid nozzles 32A and 32B via B. The nozzle 32A132B is moved in the vertical direction by the vertical movement of the cylinder rod 22, and is also rotated in a three-dimensional direction as described later, and is therefore set to spray cleaning water toward the entire surface of the inner wall of the tank. There is. Moreover, since the cleaning water is sprayed from the self-cleaning nozzle 33 installed above to the nozzles 32A and 32B,
The nozzles 32A, 32B themselves are prevented from becoming inoperable due to adhesion of fresh concrete.

Said nozzle 32A. The rotation of the drive mechanism 32B in the three-dimensional direction is achieved by making the drive mechanism 31 have the above structure. llI3
This is done by the water pressure of the washing water supplied to 5. That is,
The rotor blade 52 is rotated by the water pressure of the injection limb injected from the cleaning water supply path 35a of the main shaft 35 through the supply path 4lb from the drive nozzle 45, and the rotor blade support 5l integral with the rotor blade 52 is rotated. The large diameter portion 4 of the spur gear 46 is engaged with the rotation of the gear 51a formed on the rotary blade support 5l.
6a to rotate the large diameter portion 50a of the spur gear 50 that is engaged with the small diameter portion 46b of the spur gear 46.

The idle gear 47 is rotated by the rotation of the small diameter portion 50b of the spur gear.
The pinion 48 is rotated in conjunction with the rotation of the pinion 48. The rotation of the pinion 48 rotates a gear 49 formed on the outer periphery of the lower end of the rotating body 40, thereby causing the rotating body 40 to rotate about the main shaft 35. The vertical axis Q of this rotating body 40.
Due to the rotation around Q1, the horizontal shaft body 42 attached to the rotating body 40 is also rotated around the vertical axis Q1. The vertical axis Q of this horizontal shaft body 42. By rotation around , the horizontal axis body 4
The rotating bevel gear 43 fixed to
By meshing with the bevel gear 41a of the fixed bevel gear 4l to which the bevel gear 4l is fixed, [llllR. horizontal axis line Q perpendicular to
, rotates around .

Since the cleaning water nozzles 32A and 32B thus rotate about the vertical axis Q and the orthogonal horizontal axis g, the cleaning water is sprayed in three-dimensional directions as shown in FIG. 4.

Next, the operation of the automatic cleaning device during the production of fresh concrete will be explained.

The production of ready-mixed concrete is carried out in batches, and the time required per batch operation is usually 40 seconds, during which time cement, mixing water (3 seconds), and sand (5
Second) Gravel (10 seconds) was added one after another, and then the stirrer was rotated to continuously knead (about 20 seconds).

The automatic cleaning device 2 is installed at the same time as the ready-mixed concrete is manufactured.
A portion of the mixing water used for producing fresh concrete is supplied to the tank for automatic cleaning of the inner walls of the tank. The cleaning liquid is supplied to the automatic cleaning device at the same time as the sand starts to be added.
It ended at the same time as the gravel was added. Therefore, the cleaning time is approximately 3 seconds after the start of operation! Do this for 5 seconds,
Not done during kneading. Also, the amount of kneading water per 1 batch is about 30011! in the case of,! The amount of washing water per batch is 12g to 17Q, and the amount of washing water is suppressed to 4 to 8% of the total kneading water supplied.

The present invention is not limited to the above embodiments, and for example, from the self-cleaning nozzle 33 to the tank inner wall cleaning nozzles 32A, 32B.
Preferably, tap water is used as a cleaning device that sprays toward the surface. In this case, as shown in FIG. 8, a clean water storage tank 80 is provided separately, and the tank 80 is directly connected to the supply path to the self-cleaning nozzle 33 via a pipe 82 with a pump 8l interposed therein. Connected. This spraying from the self-cleaning nozzle 33 using clean water is carried out at the same time as the start of feeding of the kneading water to clean the tank inner wall cleaning nozzle 32A132B. This self-cleaning liquid made of tap water is also used as mixing water, and is measured and supplied in advance as part of the total amount of mixing water.

Effects of the Invention As is clear from the above explanation, according to the automatic cleaning device for the inner wall of a mixer tank according to the present invention, the water used as part of the mixing water is used as a cleaning solution for each batch operation for producing ready-mixed concrete. Since it is designed to be used as a sprayer and sprayed towards the entire inner wall of the tank, it is possible to clean and remove the raw concrete that jumps up and adheres to the inner wall of the tank.
This can be done while producing ready-mixed concrete. In this way, since cleaning is performed every time the tank is operated, the tank inner wall can be maintained in a constantly cleaned state, and it is possible to prevent fresh concrete from adhering to the tank inner wall, drying and solidifying, and even layering. This eliminates the need for cleaning work by workers, resulting in labor savings.

Further, according to the automatic cleaning device of the present invention, a self-cleaning nozzle is provided for cleaning the tank inner wall cleaning nozzle itself, and the drive mechanism of the tank inner wall cleaning nozzle is surrounded by a cover to make it a closed type. For,
It is possible to prevent the nozzle from becoming inoperable due to adhesion of fresh concrete. Furthermore, since the tank inner wall cleaning nozzle is moved in three dimensions and moved up and down, the nozzle can spray the cleaning liquid over the entire tank inner wall, ensuring that the tank inner wall is cleaned. It has various advantages such as being able to

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the ready-mixed concrete manufacturing equipment, Figure 2 is a schematic plan view of the mixer tank, Figure 3 is a schematic front view of the mixer tank, Figure 4 is a front view of the automatic cleaning device, and Figure 5 is a schematic diagram showing the ready-mixed concrete manufacturing equipment.
The figure is a vertical cross-sectional view of the rotating nozzle, Figure 6 (AXB) is a cross-sectional view showing automatic clogging prevention means for the nozzle injection port, and Figure 7 is a vertical cross-sectional view of the rotating nozzle.
The figure is a schematic diagram showing the cleaning liquid supply section to the automatic purifying device.
The figure is a schematic diagram showing a modification of the device according to the invention. l... Mixer tank, 2... Kneading water storage tank, 20 (20A, 20B)... Automatic cleaning device, 2l... Cylinder, 22... Cylinder rod, 30... Self-cleaning nozzle header 3l... Drive mechanism, 32A, 32B... Tank inner wall cleaning nozzle, 33...
Self-cleaning nozzle, 35...main shaft, 40...rotating body,
4l...Fixed bevel gear, 42...Horizontal shaft body, 43...Rotating bevel gear, 60, 61, 62...Cover

Claims (1)

[Scope of Claims] 1. A rotary nozzle is installed inside the mixer tank to spray cleaning water toward the inner wall of the tank, and when raw materials such as sand and gravel are input during batch operation of ready-mixed concrete, the water is used as part of the mixing water. An automatic cleaning device for the inner wall of a mixer tank for producing fresh concrete, characterized in that the water used is supplied as cleaning water to the rotating nozzle, and the cleaning liquid is injected from the rotating nozzle toward the inner wall of the tank. 2. The rotating nozzle installed in the mixer tank includes a tank inner wall cleaning nozzle that sprays cleaning liquid toward the tank inner wall, and a self-cleaning nozzle that sprays cleaning liquid toward the tank inner wall cleaning nozzle. The automatic cleaning device according to claim 1, characterized in that: 3. The spraying of the cleaning liquid from the self-cleaning nozzle to the tank inner wall cleaning nozzle is arranged to start at the same time as mixing water is introduced into the tank, and the cleaning liquid sprayed from the self-cleaning nozzle is 3. The automatic cleaning device according to claim 2, wherein water is used. 4. The automatic cleaning device according to any one of claims 1 to 3, wherein the drive mechanism of the rotary nozzle is surrounded by a cover to make it a closed type to prevent fresh concrete from getting into the drive mechanism. 5. The rotary nozzle drive mechanism is such that the tank inner wall cleaning nozzle installed in the drive mechanism is centered on its vertical axis with respect to a main shaft vertically disposed on the upper wall of the tank. Claim characterized in that the tank is rotated and rotated about a horizontal axis perpendicular to the vertical axis, and the cleaning liquid is sprayed in a three-dimensional direction from the tank inner wall cleaning nozzle. Automatic cleaning device according to items 1 to 4. 6. The automatic cleaning device according to claim 5, wherein the rotary nozzle is attached to the tip of a rod of a lifting cylinder and is configured to spray cleaning liquid in the three-dimensional direction while moving up and down.