JP2527805B2 - Cleaning method for horizontal rotary shaft concrete mixer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for cleaning a horizontal rotary shaft type concrete mixer having a horizontal rotary shaft with a kneading blade in a kneading tank.

[Conventional technology]

As a conventional method for cleaning this type of horizontal rotary shaft type concrete mixer, after the completion of all kneading work, water is poured into the mixer using a water injection pipe for kneading water while the mixer is operating, and the kneading blades are The attached kneading arm and the deposits and deposits on the rotating shaft where the kneading arm is attached are washed away, and then the worker enters the mixer and jets pressure water from the jet nozzle to remove the deposits and deposits. Or
When it could not be removed with pressure water, it was removed by spraying pressure water while hitting it with a hammer. However, after the completion of all the kneading work, the cement has begun to harden and it is difficult to remove the deposits and deposits, so this work requires a lot of labor and time, and it is a very painful work. It was a very dangerous work physically due to an erroneous operation.

In another horizontal rotary shaft type concrete mixer cleaning method, a nozzle is attached to the ceiling of the mixer and this is connected to a kneading water circuit connected to a measuring tank and a pump to mix the kneading water during kneading of each batch. It was attempted to reduce the work after the completion of the kneading work by pressurizing a part of the mixture and spraying it from the nozzle to remove the deposits and deposits on the kneading arm and the rotating shaft.
However, since a part of the kneading water is used and the amount of water is limited, a sufficient cleaning effect cannot be exerted, and it takes a considerable time to clean the kneading work after the completion. After all, in both conventional cleaning methods, waterproofing equipment has to be worn inside the mixer and manual work has to be done in a tight and cramped place with no body freedom, which is very painful for the workers. It was a job and a dangerous task.

[Problems to be Solved by the Invention]

Therefore, an object of the present invention is to provide a method for cleaning a horizontal rotary shaft type concrete mixer which can easily remove deposits and deposits in the horizontal rotary shaft type concrete mixer.

[Means for solving the problem]

In order to achieve the above object, in the method for cleaning a horizontal rotary shaft type concrete mixer according to the present invention, a horizontal rotary shaft from a kneading water pump used for adding kneading water to a concrete material when kneading the concrete material is used. Separately from the kneading water circuit up to the nozzle installed parallel to this, a first washing dedicated water pipeline having a washing dedicated water pump is provided, and the downstream end is connected to the middle of the kneading water circuit. Then
Further, a second washing-dedicated water pipeline having a nozzle disposed in the kneading tank at the downstream end is provided, and its upstream end is connected to the middle of the first washing-dedicated water pipeline to form a washing-dedicated water circuit, During the cleaning work between the kneading operations, the horizontal rotary shaft in the kneading tank is rotated at a constant speed, and the valve is operated.
Only the first washing water pipe to the washing water pump and the pipe to the kneading water circuit nozzle communicate with each other, and only from the kneading water circuit nozzle, or only the first and second washing water pipes. It is characterized in that a large amount of high-pressure water is sprayed into the concrete mixer from the nozzles of the water circuit for exclusive use of cleaning or both of the nozzles of the water circuit for exclusive use of cleaning, and the nozzles for exclusive use of cleaning are used to communicate from both nozzles. .

[Examples] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1, FIG. 2 and FIG. 3 show one embodiment of the twin-shaft type forced stirring concrete mixer cleaning device for batcher plant according to the present invention. FIG. 3 shows a sectional view of the interior of the mixer of the concrete mixer cleaning apparatus shown in FIGS.

As is well known, inside the kneading tank 2 of the concrete mixer mounted on the mixer floor 1a of the batcher plant, as is well known, in order to knead sand, cement, gravel, kneading water, etc., as shown in FIG. 3, a kneading arm 4 for supporting the kneading blades, and two rotatable horizontal rotary shafts 5 and 5'to which the kneading arm is fixed are provided in parallel (Fig. 4). In the upper part of the kneading tank 2, three material inlets 6 for sand, cement and gravel are provided, and above that, a material measuring tank 7 (Fig. 1) is arranged. A mixer gate 8 (Figs. 1 and 3) is provided in the lower portion of the kneading tank 2, and a concrete hopper 9 for discharging concrete after kneading is arranged below the mixer gate 8.
Further, above the kneading tank 2, a kneading water pump 10 connected to the kneading water measuring tank 10a is provided.
A pipe 11 connected to 10 is connected to a kneading water line 13 via a valve, for example, a three-way valve 12, and this kneading water line 13 is connected to a kneading water line 14.
14 '(Fig. 4), branching into these kneading water lines 14 and 14'
Are the horizontal rotary shaft 5, the kneading arm 4, and the kneading blade 3, respectively.
In order to wash the water, it is connected to a large number of kneading water nozzles 15 and 15 'arranged in the upper part of the kneading tank 2 to form a usual kneading water circuit. A dust collector (fan) 16 is connected to the kneading tank 2 in order to absorb dust inside the kneading operation. As is well known, concrete is made by mixing sand, cement, and gravel at a predetermined ratio and kneading by adding a measured amount of kneading water, but a kneading water pump is used when adding a predetermined amount of kneading water. Since it is not used when cleaning a concrete mixer, it is not directly related to the method for cleaning a concrete mixer according to the present invention.

In order to pump the exclusive cleaning water from the existing waste water treatment equipment or the recovered water tank 17 into the mixing tank 2 by the high-pressure exclusive cleaning water pump 18, a second separate from the mixing water circuit 11, 13, 14, 14 '. A single clean water line 19 is provided. A first washing water line 19 from a high-pressure washing water pump 18 is connected to the kneading water circuit by a three-way valve 12. According to the present invention, as shown in FIG.
Separately from the above, a washing water nozzle 25 is provided, and this is connected to the first washing water pipe 19 from the high pressure washing water pump 18 via the second washing water pipe 26 and the shutoff valve 27. A separate water circuit for cleaning is formed.

Concrete hopper 9 below the mixer gate 8
A drain hopper 20 for receiving the exclusive cleaning water that has washed the inside of the kneading tank 2 is arranged under the gate 9a of the concrete hopper 9 as shown in FIG. An arm is attached to the frame 1b so as to be pivotable between a use position A and a standby position B of an imaginary line on the side thereof.
Installed via 21. The wastewater hopper 20 is further connected to the wastewater treatment device or the recovered water tank 17 by a return pipe 22. In FIG. 3, the return circuit from the bottom of the mixer gate 8 to the tank 17 is omitted. In addition, 23 shows a cement measuring tank.

A method of operating the horizontal rotary shaft type concrete mixer cleaning device thus configured will be described with reference to the time chart of FIG.

When starting the mixer cleaning work between kneading work,
Turn on the cleaning push button switch and display "Mixer cleaning" to prevent danger. The dust collection fan 16 is stopped to prevent spraying of the cleaning water. The drainage hopper 20 is moved from the standby position B to the use position A below the concrete hopper 9.
Turn to. Turn on the high-pressure washing water pump 18,
At the same time, the three-way valve 12 is actuated to connect the first washing water pipe 19 side and the kneading water pipe 13 side to shut off the kneading water pipe 11 side from the kneading water pump. High-pressure cleaning water is sprayed from the nozzle 15 into the mixer. The mixer is turned on to rotate the horizontal rotary shaft 5, the kneading arm 4, and the kneading blade 3 (see FIGS. 3 and 4). During this rotation, the inside of the mixer is cleaned. Especially, in the case of a twin-screw type mixer or a single-screw type mixer, the rotation axis is horizontal and the kneading arm is short as compared with a pan-type mixer with a vertical rotation axis. Except when the arm and the kneading blade are directly under the horizontal rotation shaft, the water for cleaning is always received.Therefore, a sufficient cleaning effect can be obtained by keeping the horizontal rotation shaft in the kneading tank rotating at a constant speed without lowering the rotation speed. can get. After 30 to 60 seconds of the timer setting time, the kneading water line 11 of the three-way valve 12
Side and the kneading water pipe line 13 side to pass the first cleaning-only water pipe line
Cut off the 19 side. At the same time, the mixer gate 8 (Fig. 1) is opened, the used cleaning water is discharged to the concrete hopper 9, and after the timer setting time (10 seconds in Fig. 5), the mixer gate 8 is closed and the mixer is turned off. Stop. As described above, the three-way valve 12 is connected to the kneading water conduit 11 side to shut off the first cleaning exclusive water conduit 19 side, and at the same time, the high-pressure cleaning exclusive water pump 18 is turned off. After the mixer gate 8 is opened and drained, the timer setting time has passed (in Fig. 5,
After 20 seconds), when the gate 9a of the concrete hopper 9 is opened, the exclusive cleaning water enters the drain hopper 20 and is returned from there to the recovered water tank 17. The drain hopper 20 turns to return to the standby position B, and the display of "mixer cleaning" disappears. The cleaning time according to this time chart is 65 seconds.
In this way, the inside of the mixer is cleaned.

In this concrete mixer cleaning device operating method, in order to simplify the description, the valve is operated to connect the first cleaning-dedicated water pipe 19 to the kneading water circuits 11, 13, 14, 14 ′, The case where the cleaning-only water is sprayed from only the kneading water nozzle 15 of the kneading water circuit into the mixer for cleaning has been described.
By closing the three-way valve 12 and opening the shutoff valve 27, it is possible to use this washing water circuit alone to inject the washing water into the mixer only from the washing water nozzle 25, or to shut off the three-way valve 12. Water nozzle dedicated to cleaning with both valves 27 open
It is also possible to inject the cleaning-only water from both 25 and the kneading water nozzle 15.

An embodiment in which the cleaning of the inside of the mixer according to the present invention is incorporated in a concrete kneading work cycle of one day will be described with reference to FIG. In this case, the cleaning apparatus of FIG. 1 constitutes an automated mixer cleaning system in relation to the kneading time so that the cleaning operation is automatically performed between the kneading operations. In the example of FIG. 6, the operation starts at 8 am and ends at 5 pm, the kneading time is 45 seconds, the discharging time is 15 seconds,
That is, one batch is operated continuously with a cycle time of 60 seconds. In this example, the inside of the mixer was washed using kneading water during concrete kneading for each batch, and was performed using only the kneading water nozzle during the kneading operation time of 1.5 h. In addition, in this embodiment, the cleaning work interval is set to 1.5 hours, but this cleaning work interval is preferably 1 to 2 hours, and it is desirable to perform the cleaning once or more in at least 2 hours. When using early-strength cement, it is better to set the cleaning interval shorter, as the setting will start sooner. In the embodiment of FIG. 6 using the cleaning method of the present invention, it is sufficient to perform the cleaning work 6 times a day (total time of about 6 minutes) in one cleaning work time of 65 seconds, but the conventional cleaning By way of
They had to do the cleaning during the lunch break and after a day's work, enter the mixer and perform the difficult and dangerous work over an hour.

INDUSTRIAL APPLICABILITY The cleaning apparatus for a horizontal rotary shaft type concrete mixer of the present invention is particularly effective for a single-layer uniaxial or biaxial forced stirring mixer and a laminated uniaxial or biaxial forced stirring mixer.

〔The invention's effect〕

In addition to the kneading water circuit and the first washing-only water pipeline, a second washing-dedicated water pipeline having a nozzle arranged in the kneading tank at the downstream end is provided and the upstream end of the first washing-only water pipeline is provided. Connect in the middle and operate the valve so that only the first washing water pipe to the washing water pump and the kneading water pipe to the nozzle of the kneading water circuit communicate with each other, or only from the nozzle of the kneading water circuit, or A large amount of high-pressure water is made concrete by a washing water pump from both nozzles of the washing water circuit or by connecting both circuits by connecting only the first and second washing water pipes. Since the cleaning can be performed by spraying into the mixer, there is an advantage that the cleaning operation can be selectively performed according to the state of adhesion of deposits and deposits in the mixer. In particular, a horizontal rotary shaft type mixer having a horizontal rotary shaft and a short kneading arm as compared with a vertical rotary shaft pan type mixer has a nozzle of a kneading water circuit above the horizontal rotary shaft and in parallel therewith. Since water for cleaning is always received except when the kneading arm and the kneading blades are directly under the horizontal rotation shaft, sufficient cleaning can be performed by rotating the horizontal rotation shaft in the kneading tank at a constant speed without lowering the rotation speed. The effect is obtained.

[Brief description of drawings]

1 is a side view of a concrete mixer of a batcher plant equipped with a cleaning apparatus according to the present invention, FIG. 2 is a schematic plan view of the batcher plant of FIG. 1, and FIG. 3 is an inside of the concrete mixer of FIG. FIG. 4 is a cross-sectional view showing the kneading tank of FIG. 3 taken along the line IV-IV in FIG.
FIG. 6 is a time chart when operating the cleaning apparatus of the present invention, and FIG. 6 is a time chart showing an example in which the cleaning method of the present invention is automatically incorporated by incorporating it into a concrete kneading work cycle of one day. 2 …… Kneading tank 4 …… Kneading arm 5 …… Horizontal rotary shaft 11,13,14,14 ′ …… Kneading water circuit 12 …… Valve 15,15 ′ …… Kneading water circuit nozzle 18 …… Cleaning water Pump 19 …… First cleaning water line 25 …… Nozzle for cleaning water circuit 26 …… Second cleaning water line

Claims (1)

(57) [Claims] 1. A method for cleaning a horizontal rotary shaft type concrete mixer having a horizontal rotary shaft with a kneading blade in a kneading tank, the kneading water used for adding kneading water to a concrete material when kneading the concrete material. Separately from the kneading water circuit from the pump for cleaning to the nozzle provided in parallel above the horizontal rotation axis, a first water line for exclusive use of washing having a pump for exclusive use of washing water is provided, and the downstream end is kneaded. Connected in the middle of the water circuit, and further providing a second water line exclusively for cleaning having a nozzle disposed in the kneading tank at the downstream end, and connecting the upstream end to the middle of the first water channel exclusively for cleaning. A water circuit dedicated to cleaning is formed, and during the cleaning work between kneading operations, the horizontal rotary shaft in the kneading tank is rotated at a constant rotation, and the valve is operated to perform the first cleaning dedicated to the cleaning water pump. Water pipe and kneading water times Only the nozzle of the kneading water circuit by communicating only the conduit to the nozzle of the passage, or only the nozzle of the dedicated cleaning water circuit by communicating only the first and second cleaning dedicated water conduits, or both circuits A method for cleaning a horizontal rotary shaft type concrete mixer, characterized in that a large amount of high-pressure water is injected into the concrete mixer from both of these nozzles by means of a water pump for exclusive use of cleaning to wash the concrete.