JPS62257812A - Slurry batcher and manufacture of slurry - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for producing cement slurry in a patch manner.

(Prior Art and Problems to be Solved by the Invention) When manufacturing concrete, it is known to mix cement and water in advance to create a cement slurry. The resulting slurry, or cement paste, is typically added to an aggregate (sand, gravel, or a mixture thereof) to form a concrete mix. This type of concrete a-synthesis 2 is, for example, Keiring (Ko
No. 1,923,151 to Manab Ehring and Manab
e) in US Pat. No. 2,015,488.

With the relatively recent advent of concrete trucks, it has become common to use truck-mounted mixers to mix separately added amounts of water, cement, and aggregate. Existing cement plants used to mix concrete in transport (truck) mixers and to manufacture cement blocks, i.e., casting on-site, do not transfer concrete directly from cement silos to trucks, i.e. When transferring to cement slurry batcher, cement dust (du
St) or cement spillage may occur, which is an undesirable side effect.

In addition to the danger that cement dust poses to the surrounding environment and health, from an economic point of view, it takes an hour and a lot of effort to wash or remove unwanted cement dust and spills. Currently, it typically takes a concrete mixer truck worker 5 to 10 minutes to fill the mixer with cement and then rinse off the accumulated cement dust with a water hose at the end of the day. If you do it after that, it will take about half an hour.

SUMMARY OF THE INVENTION The novel apparatus and method of the present invention provide for rapidly and repeatedly mixing cement slurries in a batch manner without substantially contaminating the surrounding environment with cement dust. Moreover, the method of the present invention in this case allows concrete mixers, such as truck-mounted concrete mixers, to be loaded with cement in the form of a slurry without the risk of creating dust contamination.

The predetermined amounts of cement and water added to a slurry mixer are described, for example, in U.S. Pat.
, 488, may be regulated or controlled prior to introduction into the slurry mixer.According to a preferred embodiment of the present invention, only one control means is used to control the water so introduced. and the amount of cement can be regulated. In their simplest form, these quantities are controlled by regulating and determining the weight of water added to the slurry mixer, and similarly by weighing and determining the amount of cement added to the mixer, thus , eliminating the need to use equipment to separately measure the amounts of water and cement added.

In order to mix cement and water in accordance with the present invention, it is important that the cement slurry batcher into which the water and cement are added be a substantially closed volume. Since the container is sealed, the air trapped in the container adds much more cement to the container than water by volume.
At least during the addition of a given amount of cement, the air must be evacuated; the addition of cement carries away cement dust with the air exhausted by displacement with the cement, so that it is in communication with the surrounding air and confined within the container. Air vents and cement dust collection means are provided for exhausting excess air.

In a preferred embodiment of the invention, the air vent and cement dust collection means includes a sump and conduit means for directing the trapped air and cement dust to the water contained in the sump.

According to another embodiment of the invention, the sump water can be added to the cement slurry after venting the container. Therefore, a water filter and exhaust structure is adopted and the wastewater (i.e., water containing cement dust) is removed so that the water in the basin contaminated by cement dust is incorporated into the slurry and is not disposed of as a pollutant. When added to a slurry, the water in this reservoir or second chamber can advantageously be included in the predetermined amount of water added to the vessel during each batch operation.

According to the above configuration, the novel cement slurry buffet of the present invention, which is used to mix a predetermined amount of cement with a predetermined amount of water in a batch mode, is provided with a substantially closed container containing the water and cement as described above. It is equipped with 7,000 bar containers. Cement inlet and water inlet means are provided within the batcher for mixing the water and cement into a slurry. Slurry discharge means are provided at the bottom of the batch container. Control means are also provided to regulate the amount of wood and cement introduced into the vessel in each batch operation, and as described above, air vent and cement dust collection means in communication with the surrounding air are used and at least As the cement is introduced into the container, trapped air is evacuated and cement dust carried by the air is collected.

The amounts of water and cement added are determined and measured outside the container. That is, by measuring the weight of water in the container and the weight of cement in the container, it is controlled and regulated on a weight basis.

In a preferred form, the air venting and cement dust collection means comprises a sump and conduit means for passing said entrapped air and cement dust to water contained in said sump. The wood containing the collected cement dust is preferably introduced into the container after the addition of cement, and the amount of water in the sump is added to the total predetermined amount of water added to the container in each batch operation. A simple malformation of an air vent and cement dust collection means that uses a water sump is to ensure that one end of the container is in such a way that the air expelled from the container containing the cement dust bubbles through the water in the sump. A conduit that communicates with the interior of a water tank and terminates at the other end below the water surface.

The water contaminated with cement dust may be fed directly to the slurry mixer by gravity or under pressure from a sump located above, or at a predetermined location within the mixer so that it is introduced more uniformly into the slurry within the mixer. Aimed to be put in.

In carrying out the method of the invention, a first major portion of a predetermined amount of water is added to a substantially closed mixing vessel or batcher and a second minor portion of said predetermined amount of water is added to a sump or batcher. 2
Next, a predetermined amount of cement is added to the container and mixed with the first bulk of the wood. The cement dust generated in the container during cement addition is led together with the discharged air into a second small portion of water. This second small portion of water then captures the cement dust discharged from the container. is added to the first bulk portion of wood and cement and mixed to form a slurry.

As in the above-described arrangement 4 of the present invention, the predetermined amounts of water and cement used in each batch operation can be determined external to the slurry mixing vessel prior to addition or, preferably, added to the vessel. weight of water and ff of cement
According to a further feature of the invention, flJ can be simply determined and controlled by measuring or monitoring the amount of
The apparatus and method of the present invention can be implemented by simply retrofitting many existing concrete plants.

(Example) The present invention will now be described with reference to the accompanying drawings, in which reference is made to the same drawings. ′! ! Numbers are used to refer to similar parts.

Referring first to Figures 1.2 and 3, the slurry batcher is designated by the reference numeral 1 and is connected to the end wall 2.
and 3, and a central mixing drum or cylinder 4. The batcher l is supported on one side by a centrally disposed drum support leg 5 and on the other side by two spaced apart drum legs 6, and is generally arranged and generally designated by the reference numeral 7.
A load cell (load cell), denoted by
cell) and is supported by a support or base bracket. The load cell 7 itself is supported by a support framework (not shown) that is well known in the art.

A discharge pipe 9 for discharging the slurry mixed in the batcher 1 is arranged at the lower side of the drum 4. A closure gasket (c
A closure or butterfly valve 10 adapted to sealingly engage a loss gagket 11. One end of the shaft 12 of the valve 10 is connected to a crank arm 13, and the valve is attached to a support bracket in a known manner.
It is opened and closed by an air cylinder 14 supported by a cylinder 15 and operated by an air cylinder 14. /<-7 The tier itself allows the concrete truck to drive under the bacher, and
It can be placed elevated via a support (not shown) to receive the cement slurry discharged via the pipe 9.

The mixing means provided inside the batcher 1 can be a 4W configuration of any suitable form, but as shown, it is arranged in the center of the mixing drum 4 and provided at the end, with reference numeral 4. end wall 2 by a bearing 25 indicated by 25
It has an elongated shaft 23 supported by and 3.

An arm 21 extends radially from a rotatable central shaft 23 and is fixed thereto. The free end of the radially extending arm is connected in a transversely extending manner to a support 22 and is provided with a wiper blade 20, as clearly shown in FIG. It is configured to wipe off the inner wall of 4.

End supports 24 are cross-linked to supports 22.

1, an electric motor 26 and a reduction gearbox 27 with a drive pinion 28 are connected to the end wall 2.
is supported by A driven gear 29 is disposed external to the wall 2 and is secured to the shaft 23 for rotating the slurry mixing means as shown. The cover plate 31 of this drive means can be mounted so as to enclose the motor, gearbox and driven gear, as shown in FIG.

A discharge pipe 36 connected to a cement supply hopper (not shown) is connected to a cement entry tube 38 disposed at the top of the batcher 1, as clearly shown in FIG. It is connected to tube 38 by a sexual boot 37 . The discharge pipe is provided with a shut-off valve (not shown) which operates in a manner similar to the slurry valve 10 to control the amount of cement introduced into the drum 4. Also provided on the top of the drum is a removable, removable inspection and management cover or port 39.

Water is introduced into the batcher via a pipe 5 connected to a supply pipe 50, which also has a mounting indicated by the reference numeral 46 with a bracket or strap, as clearly shown in FIG. The inlet vibrator 51 also has a main water shut-off valve 53, which communicates with a second water supply pipe 52 terminating inside a second water drum or sump 45 attached to the mixing drum 4. The valve 53, however, is connected to a single actuation lever arm 54 and a pneumatically actuated solenoid valve or piston 55, as described above, to control the introduction of water into the batcher. Similarly, the second drum inlet vibe 52 is also equipped with another shut-off valve 58 controlled by a lever arm 59 actuated by an air piston 60.

As clearly shown in FIG. 5, a second water drum 45 is also provided. It has a breather shutoff valve 67, which, when opened, allows the interior of the drum ↓5 to communicate with the surrounding air.

Valve 67 together with solenoid pulp 65.

It is located above the water level 64 in the drum 45, which will be explained in more detail below.

Solenoid pulp 45 controls the introduction of pressurized air into drum 45 supplied by pressurized hose supply hose 66 .

As shown in FIG. 5, an air vent pipe 61 communicates with the interior of the batcher 1 and extends below the water level 64 with the interior of the drum 45. In the case of Vibro 1 as well, a lever and valve structure, indicated by the reference numeral 62, is provided, which closes the air vent tube 61 when the air piston 63 is actuated.

Another solenoid-operated control valve 70 is located near the bottom of the second water drum 45, and when opened, the water in this drum is directed through a pipe 71, as shown in FIG. The liquid is then flushed to a second hold or distributor 72. The flushing manifold JL/F72 is a series of distribution pipes 73, the pipes 73 terminating inside the batcher at the end opposite the manifold and serving as a flushing pipe to spray water into the batcher. Two flushing nozzles are arranged on the top of the batcher and two flushing nozzles 74 are provided on the end sides 2 and 3 of the batcher, as shown in FIG. ing. As will be explained in more detail below, water in the second water tank 45 is withdrawn and directed into the interior of the drum 1 and used to clean the inner wall of the drum.

The air vent valve 65 is opened and the water in the second water drum 45 is at level 64 and the solenoid pulp 67
is open and in communication with the surrounding air, and furthermore, when cement is supplied into the batcher via the supply pipe 38, the air and cement dust displaced by the introduction of cement are transferred to the air vent pipe 61. It bubbles through the water in drum 45 and is effectively filtered out by this water.

At start-up, the valve 10 is closed, similar to the valve of the cement hopper supply (not shown). Also the valves 53 and 58 of the water supply pipes 51 and 52. valve 70
and the compressed air valve 65 are closed, but the breather shutoff valve 67 communicating with the surrounding air is open. Next, the weight of the entire batcher is determined using a load cell 7, as is well known in the wood technology field. Measured in the following manner.

Since the water to cement ratio for a given batch is predetermined, valves 58 and 53 are then opened;
Water is introduced into the batcher l and the reservoir 45. When the water in drum 45 reaches level 64, valve 58 is automatically closed and water is continuously supplied to drum 4. When the cumulative amount of water in the sump 45 and batcher 1 reaches a predetermined value, which is set above the weight of two empty bars and represents the amount of water to be placed in the batcher, the valve 53 is activated in a known manner. The weight of the water and batcher is measured by the load cell 7.

The mixing means inside the batcher can be started before or during the introduction of water, if desired. The wood and cement levels are such that the zero air bleed valve 62, shown at 8 in FIG. 3, is opened in a manner similar to the valve in the hopper (not shown) to allow cement to enter the batcher.

The hopper valve is adapted to close automatically in a known manner when the weight of the batcher, the weight of water and the weight of added cement meet predetermined values representing the desired ratio of cement to water to be added. has been done. When the batcher is properly closed, the cement is mixed with water in the batcher, and the resulting dust is removed by a breather, where the displaced air in the batcher is in communication with the air vent tube 61, the water in the drum 45, and the surrounding air. The dust carried away by this air as it is discharged through the shutoff valve 67 and thus carried by this expelled air is effectively removed by bubbling the water in the drum 45 and being absorbed by the water. be done.

At this stage, there is a large amount of water in the drum 45, so
The desired proportion of water to be mixed with the cement when forming the slurry is not fully introduced into the cement, i.e. not sufficiently mixed with the cement to obtain the proper mixing ratio. Second, water in the drum 45 containing cement dust captured when the cement is introduced into the drum 45 is led to this drum and subjected to mixing.

In the embodiment described above, this is done by closing the air bleed valve 62 and the breather shutoff valve 65 and opening the flushing valve 70 so that the water in the tank 45 flows through the valve 70 and the pipe 71 to the manifold 72. , which then flows through the pipe 73 of the distributor and flushes this water containing captured cement dust through a flushing nozzle 74 and discharges it into the batcher.The pressure head and nozzle of this flushed water The flushing action of the water discharged through 74 is significantly improved by an open valve 65 and pneumatic supply hose 66 communicating with the interior of drum 45. When the 0M water is added, the resulting slurry is After the desired mixing has taken place, valve 10 is opened and the slurry is discharged from the batch.

When practicing the present invention, water-starved slurry is removed from valve 45 before flushing the batch with water from drum 45.
can be released via 0. If a concrete mixing truck is used, the slurry with less water is placed in the concrete truck first, and after flushing, the remaining water is introduced into the truck until the fifth batch operation.
0 is left open, this way the final slurry mixing will occur in the mixing track.

(Effects) As described above, according to the present invention, cement dust is captured during loading into a slurry mixer, and a weight controller is required to measure both a desired amount of cement and a desired amount of water. The aggregate can then be mixed with the resulting slurry in the desired manner, for example by adding it to a concrete mixer in a truck subsequent to the addition of the slurry.

[Brief explanation of drawings]

Fig. 1 is an end view of a cement slurry batcher showing the mixing means disposed inside and the driving means connected to the mixing means, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, and Fig. 3 is a FIG. 2 is a sectional view taken along line 11-411 in FIG. 2, FIG. 4 is a plan view of the slurry mixer showing the cover plate covering the driving means shown in FIG. 1, and FIG. 5 is a plan view showing the air venting means and the second water tank. FIG. 2 is a sectional view taken along line V-V in FIG. 2; 100. Batcha, 2.3.6. End wall 411. Mixing drum, 5.660. Support legs 71. , load cell,
990. Discharge pipe 11, closure gasket,
12. ,. Shaft, 13. ,, crank arm, 14. ,,
Air cylinder, 15. ,,Support bracket・23・・
・Shaft, 24. ,, end support, 25. ,
, bearing, 26. ,, electric motor, 27. , Reduction gearbox, 28, Drive binion, 29. ,
, driven gear 31. ,, cover plate, 36-
,,discharge pipe, 37. ,, boots, 38.
,, tube, 39. , , cover or port , 4
5., Reservoir, 46. ,, Installation is with bracket 50
,,,supply pipe, 51. ,,pipe 52, ,water supply pipe, 53. , , shutoff valve 54 , , actuation lever arm 55. ,,renoid valve, 58
．． ,, shutoff valve. 59, Lever arm, 61. ,,air vent pipe 6
2. ．． ．． lever and valve structure, 63, pneumatic piston, 64. ,,water level,65. ,,Solenoid operated valve. 66. Compressed air supply hose 67. Valve 70. ,,control valve, 71. ,,pipe, 72. , ,distributor, 73 , ,distribution pipe, 74. ,, flushing nozzle patent applicant
ALSURA ENTERPLIZES LIMITED.

Claims (12)

[Claims] (1) Water and cement at appropriate inlets 38, 36, 51,
a substantially sealed batch container 1 receiving via 50;
means 9 for discharging a batch of slurry from said container; in a slurry batcher, water and cement are placed in the container in regulated predetermined amounts in each batch operation and mixed in the container to form a slurry; and a water sump 45 containing water and connected to said air venting means, through which the air escaping from the container separates the cement dust from the air and collects the dust in the water used in the batcher. A slurry batcher characterized by comprising an air vent and water reservoir means. (2) The predetermined amount of water added to the container is regulated by the weight of the water in the container, and the predetermined amount of cement added to the container is regulated by the weight of the cement in the container. A slurry batcher according to claim 1. (3) The predetermined amounts of cement and water added to the container in each batch operation are predetermined before adding the water and cement to the container.
Slurry batcher as described in section. (4) Water containing cement dust is piped into conduits 71, 72, and 73.
4. The slurry batcher according to claim 1, wherein the slurry batcher is returned to the mixing container via the slurry batcher. (5) The slurry batcher according to claim 4, wherein water in a reservoir that is returned to the mixing container is included in the predetermined amount of water. (6) A claim characterized in that the air venting and water sump means comprise conduit means 71, 72, 73 having one end communicating with the interior of the mixing vessel and the other end terminating below the level of the water in the sump. The slurry batcher according to range 1, 2, 3, 4 or 5. (7) An air vent 61 for discharging the air in the mixer container and a cement dust collector 45 for collecting cement dust carried by the air when the cement is introduced into the container are disposed outside the mixing container, and 7. A slurry batcher as claimed in claim 1, 2, 3, 4, 5 or 6, characterized in that cement dust collected with said slurry can be conveyed in a controlled manner from said sump to said mixing vessel. (8) The water supply conduit 50 includes a branch pipe 51 having a valve 53 and communicating with the mixer container, and a branch pipe 52 having a valve 58 and communicating with the air purge reservoir. , 4, 5, 6 or 7. (9) (a) adding a first major portion of a predetermined amount of water to a substantially closed mixing vessel and adding a second minor portion of said predetermined amount of water to a second reservoir; (c) adding a predetermined amount of cement to the water in the first bulk portion of the container; (c) adding air and cement dust generated by adding the cement to the mixing container into the second (d) at least said first bulk portion of water; and then adding said second minor portion of water to said first bulk portion of water and cement in said mixing vessel; a step of mixing the cement with the cement in the container to form a cement slurry. 10. The method of claim 9, wherein the first major portion of water, cement, and the second minor portion of water are mixed together. (11) The predetermined amounts of water and cement are determined by weighing the first major portion of water and the second minor portion of water added to the container and weighing the cement added to the container. Claim 9 characterized by
The method described in section. 12. The method of claim 9, wherein the cement slurry is introduced directly into a concrete mixer and mixed with a predetermined amount of aggregate added separately to the concrete mixer.