JPH08192420A - Method and apparatus for washing concrete mixer - Google Patents

Abstract

PURPOSE: To obtain sufficient washing effect even by an inexpensive small capacity pump in the washing of a concrete mixer. CONSTITUTION: When the interior of a concrete mixer is washed by ejecting high pressure water from the jet nozzles 12, 12, 12 of the washing pipe provided in the concrete mixer, the washing pipe 10 is set at a predetermined rotary position centering its axis and a predetermined slide position in its axial direction to eject high pressure water for a predetermined time and, subsequently, the rotary position and slide position thereof are appropriately altered to eject high pressure water for a predetermined time in the same way to wash the interior of the concrete mixer. Or, high pressure water is ejected while the rotary position and slide position thereof are changed to perform washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a concrete mixer, in which high-pressure water is injected from an injection nozzle of a cleaning pipe provided in the concrete mixer to clean the inside of the concrete mixer, and directly used for carrying out this method. And a cleaning device.

[0002]

2. Description of the Related Art As is well known, concrete mixers are
It is composed of a kneading tank, a kneading blade provided in the kneading tank, and other accessory devices. Therefore, concrete is obtained by adding sand, cement, gravel, kneading water, etc. into the kneading tank and rotating the kneading blades for a predetermined time. The kneaded concrete is discharged from the mixer gate to the concrete hopper, and shipped to a necessary place, and one batch of kneading work is completed. By the way, when concrete is obtained as described above, cement, sand, mortar, etc. gradually adhere to the inner wall of the kneading tank, the kneading blades, etc.,
It will hinder the next kneading work. Therefore, the concrete mixer is washed for each batch or after completion of a certain kneading operation. The applicant of the present invention has proposed such a method for cleaning a concrete mixer according to Japanese Patent Laid-Open No. 265710/1990. Also, a similar concrete mixer cleaning device is proposed in Japanese Utility Model Publication No. 4-52009.

The cleaning devices described in these publications include a cleaning water supply pipe. A large number of injection nozzles are provided around the wash water supply pipe. The wash water supply pipe is also driven to rotate about its axis. Therefore, the inside of the concrete mixer can be cleaned by injecting high-pressure cleaning water from the spray nozzle while rotating the cleaning water supply pipe.

[0004]

Even with the above-mentioned conventional cleaning device, the inside of the concrete mixer can be cleaned by injecting high-pressure cleaning water from the injection nozzle. At this time, even if the cleaning water supply pipe is rotationally driven, unless a large number of injection nozzles are appropriately provided so as to prevent blind spots, the cleaning water reaches the inner wall of the kneading tank, the corners of the kneading blades, etc., and is not effectively cleaned. Further, since the adhered substances such as cement are hard to be removed, even if the cleaning water supply pipe is rotationally driven like the above-mentioned cleaning device, a sufficient cleaning effect cannot be obtained unless the cleaning pressure of the injection nozzle is increased. . Therefore, since a large number of injection nozzles are provided in the conventional washing water supply pipe, a large capacity pump is required to maintain the required high pressure and clean every corner. However, as a result, a large drive motor with high output is also required, resulting in an increase in equipment cost of the concrete mixer, resulting in an increase in cost. As described above, even if a large-capacity cleaning pump, a high-output motor, or the like is used, the cleaning pump, the motor, or the like is an auxiliary device that does not directly contribute to the kneading of concrete, so it is not a good idea. The present invention is intended to solve the problems of the conventional cleaning method or cleaning apparatus as described above, and uses a small-capacity, inexpensive pressurizing means, that is, a pump, and concrete that can obtain cleaning effect in every corner. It is an object of the present invention to provide a method for cleaning a mixer and a cleaning device used for carrying out this cleaning method.

[0005]

In order to achieve the above object, the present invention provides a method for cleaning the interior of a concrete mixer by injecting high pressure water from an injection nozzle of a cleaning pipe provided in the concrete mixer. The cleaning pipe is set to a predetermined rotation position about the axis, and is set to a predetermined slide position in the axial direction to inject for a predetermined time, and then the rotation position and the slide position are appropriately changed, and then the same is performed for a predetermined time. Configured to wash. According to a second aspect of the present invention, the cleaning pipe is washed by intermittently changing one of the rotational position and the slide position of the first aspect and continuously changing the other position. And claim 3
The invention described above is configured so that the cleaning is performed by spraying while continuously changing the rotational position and the slide position of the cleaning pipe. According to a fourth aspect of the present invention, there is provided a cleaning device for a concrete mixer including a cleaning pipe provided in the concrete mixer, a driving means for driving the cleaning pipe, and a cleaning water pressurizing means, The tube is configured to be driven by the driving means in a rotation direction about the axis and an axial direction, and the invention according to claim 5 is the invention according to claim 4.
A plurality of the washing pipes described above are provided in parallel with the washing water pressurizing means.

[0006]

As is well known, sand, cement, gravel, kneading water and the like are put into a concrete mixer and kneaded to obtain concrete. The obtained concrete is shipped to a required place and one batch of kneading is completed. When kneading as described above, the inside of the concrete mixer is washed for each batch, or after the completion of a certain batch kneading operation as follows. The cleaning pipe is brought into a predetermined swinging position or rotating position about the axis by the driving means. Then slide it in the axial direction. High-pressure washing water is supplied to the jet nozzle of the washing pipe from the washing water pressurizing means. Since the number of injection nozzles is small, the pressure does not drop even with a small-capacity pressurizing means, and the inside of the concrete mixer is cleaned by injection from the injection nozzles. After cleaning for a predetermined time, the rotating position and the slide position of the cleaning pipe are appropriately changed by the driving means. Then, as described above, high-pressure washing water is jetted from the jet nozzle of the washing pipe to wash. Alternatively, the same injection is performed while changing the rotation position and the slide position, and cleaning is performed for a predetermined time. Claim 5
According to the invention described above, since a plurality of washing pipes are provided in parallel with the washing water pressurizing means, for example, a switching valve is provided to connect the washing water pressurizing means and the washing pipe for jetting, and Spray and clean as described. When cleaning using another cleaning pipe, switch the switching valve and perform cleaning in the same manner. Alternatively, a plurality of cleaning pipes are simultaneously used to spray cleaning water as described above for cleaning. Even if they are sprayed at the same time, the number of spray nozzles is small, so that the pressure of the wash water does not drop.

[0007]

EXAMPLES Examples of carrying out the present invention on a biaxial concrete mixer will be described below. The biaxial concrete mixer includes a kneading tank 1 as shown in FIG. The bottom of the kneading tank 1 is formed into a twin-hull type having two valleys 2 and 2 and one crest 3, and a mixer gate 4 for discharging the kneaded concrete is formed in the crest 3. It is provided. The upper opening of the kneading tank 1 is closed by a lid 5 that can be opened and closed. Although not shown in the figure, openings are appropriately opened in the lid 5 or the side wall of the kneading tank 1, and cement, sand, gravel, kneading water, etc. are introduced through these openings in a known manner. It is supposed to be done. Inside the kneading tank 1, two rotary shafts 6, 6 are provided in parallel with the valleys 2, 2. These rotating shafts 6,
A plurality of arms 7, 7, ... Are fixed around 6, and a kneading blade 8 is attached to the tips of these arms 7, 7.

Inside the kneading tank 1, two rotary shafts 6, 6 are provided.
The first and second two cleaning pipes 10 and 10 ′ are arranged in parallel to the above and above the rotary shafts 6 and 6 at a position slightly closer to the side wall.
However, as will be described later in detail, the bearings 11, 11 are provided so as to be movable in the axial direction and rotatable about the shaft. Since the first and second cleaning pipes 10 and 10 'are structurally the same, the first cleaning pipe 10 will be mainly described below, and the second cleaning pipe 10' will be denoted by the same reference numerals in the drawings. A dash "'" is added to avoid duplicate explanation. In the first cleaning pipe 10, a smaller number of injection nozzles than the number of conventional injection nozzles, that is, three injection nozzles 12, 12, 12 in the embodiment shown in the drawing are arranged in a predetermined direction in the same direction. It is provided at intervals. Both ends of the first cleaning pipe 10 are exposed to the outside of the kneading tank 1. One end of the flexible tube is connected to the flexible hose 14 via the rotary pipe joint 13. Therefore, even if the first cleaning pipe 10 rotates or slides in the axial direction, the cleaning water can be supplied to the first cleaning pipe 10. The flexible hose 14 is connected to a pump 16 via an opening / closing valve or a switching valve 15. Note that reference numeral 17
Shows a wash water tank filled with fresh water or clear water used once.

The portion of the other end of the cleaning pipe 10 which is exposed to the outside of the kneading tank 1 is appropriately closed. The cleaning tube slide cylinder 20 which is the driving means and the cleaning tube rotating cylinder 30 are attached as described below. The cleaning pipe slide cylinder 20 is attached to a fixed base 21, and when compressed air is supplied to the piston rod side, for example, the piston rod 22 is in a contracted first slide position and is supplied to the piston head side. It is configured to be in the protruding second slide position. The other end of the cleaning pipe 10 is connected to the piston rod 22 via a rotary joint 23.

The washing tube rotating cylinder 30 is provided on a moving base 31 as shown in detail in FIG.
The movable base 31 is composed of a pair of vertical side walls 32, 32 and a horizontal base 33, and the cleaning pipe rotary cylinder 30 is mounted on the horizontal base 33 in a conventionally known manner.
A pair of through holes 34, 34 are formed at predetermined intervals in the vertical side walls 32, 32, and a pair of guides whose one end is fixed to the side wall 9 of the kneading tank 1 is formed in the through holes 34, 34. The rods 35, 35 are loosely inserted. Therefore, the moving base 31 is supported and guided by the pair of guide rods 35, and can slide and move in a direction away from the side wall 9 of the kneading tank 1 and a direction approaching the side wall 9. The pair of vertical side walls 32, 32 of the movable base 31 extend forward, and the first cleaning pipe 10 is rotatably inserted at the tip end thereof. However,
The pair of vertical side walls 32, 32 are axially constrained to the first cleaning pipe 10 by stoppers 25, 25, .... Therefore, when the first cleaning pipe 10 slides in the axial direction, the movable base 31 also slides integrally.

A drive rod 37 is connected to the piston rod 36 of the cleaning pipe rotary cylinder 30, and a rack 38 is formed on the lower surface of the drive rod 37. And this rack 38
Is a pinion 24 provided on the outer peripheral portion of the cleaning pipe 10.
Is meshing with. Therefore, the cleaning pipe rotating cylinder 3
Every time the compressed air is supplied or discharged to 0, the drive rod 37 reciprocates in the direction of the arrow, and the first cleaning pipe 10 rotates or swings about the shaft. It should be noted that the rack 38 and the pinion 24 show only one example of the rotation driving means of the cleaning pipe 10, and it is obvious that the rack 38 and the pinion 24 can be replaced with the crank arm system and can be similarly implemented.

By the way, the first cleaning pipe 10 is adapted to take the first to fourth rotational positions in this embodiment. In order to take four rotational positions in this way, it is convenient to configure the cleaning tube rotary cylinder 30 to be driven in four stages. However, since the structure is complicated, the rack 38 and the pinion 24 are schematically shown in the drawing, but the rack 38 and the pinion 24 are configured by, for example, a ratchet mechanism or the like, and each time the cleaning pipe rotating cylinder 30 is driven once. The first cleaning pipe 10 is driven to rotate by a predetermined angle, and when driven, for example, three times, the ratchet mechanism is released to return to the original position. Moreover, if the crank arm system is adopted,
Use air valve positioner.

Next, a method of cleaning the inside of the kneading tank 1 using the above cleaning device will be described. First, the first cleaning pipe 10 is used for cleaning. The cleaning tube rotating cylinder 30 is driven to bring the first cleaning tube 10 to the first rotation position. Then, the injection nozzles 12, 12, 12 face slightly upward from the horizontal, as shown in FIG. 1B. Compressed air is supplied to the piston rod side of the cleaning pipe slide cylinder 20 to move the first cleaning pipe 10 to the first slide position. Then, the switching valve 15 'is closed, the switching valve 15 is opened, and the pump 1
The washing water is pumped from 6 to the first washing pipe 10. Then, the cleaning water is sprayed from the spray nozzles 12, 12, 12 to the portion indicated by a in FIG. 1B and the portion indicated by A, A, ... In FIG.
First, A, A, ... Are washed. After cleaning for a predetermined time set by a timer or the like, compressed air is supplied to the piston head side of the cleaning pipe slide cylinder 20 to slide the first cleaning pipe 10 to the second slide position. First cleaning pipe 10
Slides to the second position, and the movable base 31 also moves while being guided by the guide rods 35. When it slides to the second position, it is sprayed on the parts indicated by a and B, B, ..., And these parts B, B ,.

After cleaning for a predetermined time, compressed air is supplied to the piston head side of the cleaning tube rotating cylinder 30. Then, the rack 38 of the drive rod 37 causes the first cleaning pipe 10 to move.
Is rotated by a predetermined amount to the second rotation position, and the injection nozzles 12, 12, 12 face the portion indicated by b in FIG. Therefore, the parts b and B, B, ... Are washed this time. After cleaning for a predetermined time, compressed air is supplied to the piston rod side of the cleaning pipe slide cylinder 20 to move the first cleaning pipe 10 to the first slide position. Then, wash in the same manner. At this time, b and A, A, ... Portions are washed. Similarly, the first cleaning pipe 10 is sequentially rotated to the third and fourth rotation positions by the cleaning pipe rotating cylinder 30, and the first cleaning pipe 10 is rotated by the cleaning pipe slide cylinder 20.
The slide position and the second slide position are alternately slid and washed.

When cleaning with the second cleaning pipe 10 ', the switching valve 15 is closed, the switching valve 15' is opened, and the cleaning water is pumped from the pump 16 to the second cleaning pipe 10 '. And wash. According to the present embodiment, the injection nozzles 12, 12, of the first and second cleaning pipes 10, 10 ',
Since the number of 12 is as small as 6 in total, the first and second cleaning pipes 1
Simultaneous washing with 0 and 10 'does not reduce the pressure. As described above, since the first and second cleaning pipes 10 and 10 'are rotated and slid to clean, the injection nozzle 1
Although the number of 2, 12 and 12 is small, the inside of the kneading tank 1 is cleaned to every corner. Further, since the number of the injection nozzles 12, 12, 12 is small, the cleaning pressure does not drop even with the pump 16 having a small capacity.

The present invention is not limited to the above embodiments, but can be implemented in various forms. For example, the first cleaning pipe 10
To the first slide position, and the first cleaning pipe 10 is sequentially rotated to the first, second, and rotation positions to obtain portions A, A, and
... and a, b, c, d are washed, and then compressed air is supplied to the piston rod side of the washing pipe slide cylinder 20 to bring it to the second slide position, portions B, B, ... and a,
Similarly, b, c, and d can be washed. In the above embodiment, the driving means for the first cleaning pipe 10 is the cylinder 2
Although it is composed of 0 and 30, it may be composed of a motor, for example, a step motor. Driving with a step motor has the advantage that it can be easily controlled in multiple stages in both the axial and rotational directions. Further, it is apparent that the same cleaning can be performed while rotating the first cleaning pipe 10 and sliding it in the axial direction at the same time.

[0017]

As described above, according to the present invention, when the inside of the concrete mixer is washed by injecting high-pressure water from the jet nozzle of the washing pipe provided in the concrete mixer, the washing pipe is centered around the shaft. As a predetermined swing position or rotation position, and a predetermined slide position in the axial direction to inject for a predetermined time, and then the rotation position and slide position are appropriately changed to inject for a predetermined time in the same manner for cleaning, or Since the spraying is performed while changing the rotation position and the slide position of the pipe, the inside of the concrete mixer can be uniformly cleaned even if the number of injection nozzles is small. Further, since the number of injection nozzles is small and cleaning is possible, the pressure of the cleaning water sprayed from the spray nozzles does not drop even if a small capacity cleaning water pressurizing means is used. Therefore, according to the present invention, when cleaning the inside of the concrete mixer, a small capacity, inexpensive pressurizing means can be used, and further, every corner can be cleaned, which is a unique effect of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, in which (a) is a plan view and (b) is a side view.

FIG. 2 is an enlarged perspective view showing a movable base portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kneading tank 10, 10'First and second cleaning pipes 12, 12, 12 Injection nozzle 13 Rotary pipe joint 20 Cleaning pipe slide cylinder 23 Rotary joint 30 Cleaning pipe rotating cylinder

Claims (5)

[Claims] 1. When washing the inside of a concrete mixer by jetting high-pressure water from a jet nozzle of a washing pipe provided in the concrete mixer, the washing pipe is placed at a predetermined rotation position around an axis, and Inject to a predetermined slide position in the axial direction for a predetermined time,
Then, the rotating position and the slide position are appropriately changed, and thereafter the same is sprayed for a predetermined time to clean the concrete mixer. 2. The cleaning pipe according to claim 1, wherein the cleaning is performed by jetting while intermittently changing one of the rotational position and the sliding position and continuously changing the other position. How to wash concrete mixer. 3. A method for cleaning a concrete mixer, which comprises spraying and cleaning while continuously changing the rotational position and the sliding position of the cleaning pipe according to claim 1. 4. A washing machine for a concrete mixer, comprising a washing pipe provided in a concrete mixer, a driving means for driving the washing pipe, and a washing water pressurizing means, wherein the washing pipe is described. A concrete mixer cleaning device, characterized in that the cleaning device is configured to be driven by a drive means in a rotational direction about an axis and in an axial direction. 5. A washing machine for a concrete mixer, wherein a plurality of washing pipes according to claim 4 are provided in parallel with washing water pressurizing means.