Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
  • B28C5/46—Arrangements for applying super- or sub-atmospheric pressure during mixing; Arrangements for cooling or heating during mixing, e.g. by introducing vapour
  • B28C5/468—Cooling, e.g. using ice

Definitions

• the present invention relates to an apparatus for producing a refrigerated concrete using liquid nitrogen. Background technology
• Sho 63-41616 is a low-volume liquid that supplies liquid nitrogen to concrete that is being kneaded and has low liquid nitrogen content.
• the facility will disclose the equipment that uses the sensible heat of the temperature and the latent heat that evaporates to cool the concrete that is being mixed.
• the concrete mixture is generally kneaded in a batch type, so that the amount of liquid nitrogen supplied per notch should be properly adjusted. Adjustments will need to be made.
• a flow meter is attached to the liquid nitrogen supply pipe to measure the flow rate, and this flow rate measurement value is used as an indication value for the liquid nitrogen supply rate control.
• liquid nitrogen flowing in the pipeline is generally in a gas-liquid mixed state (a part of the liquid nitrogen in the pipe or in the flow meter may be gas-liquid). The problem is that accurate flow measurement cannot be performed, and as a result, the cooling operation for each batch cannot be controlled accurately. Gadget
• the present invention has been made with the aim of solving this problem.
• the present invention is to supply liquid nitrogen from a liquid nitrogen supply source to a concrete kneading apparatus for kneading and mixing concrete under atmospheric pressure.
• Liquid nitrogen is supplied to the concrete in the kneading apparatus during the kneading substantially in a liquid state, and the kneaded concrete is supplied to the concrete in the kneading apparatus. It is a cooling device.
• the pipe and the gas-liquid separator are connected to the
• a weight measuring device that measures the overall weight of the gas-liquid separator while the gas-liquid separator is connected to the pipe;
• the apparatus it is necessary to cool a batch of kneaded concrete in a gas-liquid separator having a sufficient capacity.
• Liquid nitrogen is stored separately from the gas phase, and only the liquid nitrogen inside the container is supplied to the concrete kneading device by gas pressure. Since the liquid is sent through the channel and the weight of the gas-liquid separator is measured by the weight measuring device even during the liquid feeding, the liquid is sent to the kneading equipment.
• the amount of liquid nitrogen in the vessel that has been reduced since the start of the liquid transfer (that is, the cumulative amount of liquid transferred) is detected every moment, and at what point the liquid transfer ends. It is possible to accurately control the end point or the flow rate of the liquid in the liquid.
• Such control is performed by inputting the detection value of the weight measuring device and the detection value of the thermometer that detects the concrete temperature.
• Fig. 1 is a diagram showing the overall arrangement of each device of the cooling concrete manufacturing equipment according to the present invention. Description of the preferred embodiment of the invention
• FIG. 1 shows an example of the present invention when the concrete kneading apparatus is a knot of a notch plant.
• the notch plant has a cement storage bin 2, a fine aggregate storage bin 3 and a coarse aggregate storage bin 4 in the upper part of the mixer 1.
• It is a fractional kneading plant that has a well-known structure with measuring bins 5, 6, and 7 for each material as well as being installed.
• the mixer 1 is provided with a lid 8 and the materials from the shots 9, 10 and 11 are introduced. When the process is finished, the lid 8 is closed so that the inside of the mixer 1 can be formed in a closed space.
• An exhaust pipe 12 is attached to the lid 8, and an exhaust fan 13 is interposed in the lid 8.
• the exhaust pipe 13 of the exhaust fan 13 is connected to the exhaust pipe 12. Is connected to the lower side of the coarse aggregate bin 4 so that the exhaust air in the mixer 1 is guided into the coarse aggregate bin 4.
• the exhaust gas is actually liquid nitrogen introduced into the mixer 1 as described later, and almost all of the nitrogen gas vaporized in the mixer 1 is exhausted. Therefore, the second nitrogen gas is discharged into the coarse aggregate storage bin 3 via the pipes 12 and 14.
• a liquid nitrogen inlet pipe 15 is provided in the mixer 1 for admitting the liquid nitrogen between the inlet pipe 15 and the liquid nitrogen source 16.
• a supply pipeline will be provided.
• a supply control valve for liquid nitrogen 25 and a gas-liquid separator 17 for liquid nitrogen are installed on the upstream side of the valve. Is placed.
• the gas-liquid separator 17 is sufficient to store an amount of liquid nitrogen necessary to cool the material mixture per one notch in the mixer 1. It has a large volume, and its entirety is mounted on a load cell 18 which is a weight measuring instrument.
• the gas-liquid separator 17 is connected to the gas-liquid separator 17 so that the gas-liquid separator 17 can measure itself in a floating state.
• the pipes are used in flexible hoses 19 and 20. More specifically, the liquid nitrogen supply line leading to the liquid nitrogen source 16 and the inlet pipe 15 of the mixer 1 should be connected to the liquid nitrogen source 16.
• Supply pipe 21 connected to the gas-liquid separator 17 from the outlet, and the secondary supply pipe connected to the inlet pipe 15 of the mixer 1 from the gas-liquid separator 17.
• a flexible hose 19 is connected to the primary supply pipe 21 near the gas-liquid separator 17, and a gas-liquid separator 17 near the gas-liquid separator 17. Since the flexible hose 20 is attached to the secondary supply pipe 22 of the primary side, the gas-liquid separator 17 is connected to the primary side and the secondary side. While maintaining the connection relationship between the secondary supply lined pipes 21 and 22, the change in the total weight or the load cell 18 is measured. The weight detection value measured at this ⁇ — dosell 18 is applied to the control panel 23, and the force is applied. In 2 3,. The temperature detection value of the concrete already refined by the server is also input. Reference numeral 24 indicates a temperature sensor for this purpose.
• the secondary supply pipe 22 is connected below the gas-liquid separator 17 so that the liquid nitrogen separated from the gas in the gas-liquid separator 17 is led out.
• the secondary supply pipe 22 is provided with a liquid nitrogen supply amount adjusting valve 25 and the like up to the inlet pipe 15 of the mixer i. And a pressure regulating valve 26 are interposed.
• the control panel, Cell 23 accumulates and records the amount of liquid nitrogen used by each mixing patch in Mixer 1, and records the amount of liquid nitrogen used during operation. In order to supply a proper amount of liquid nitrogen to the batch, open / close operation and opening adjustment operation signals are supplied to the supply amount adjustment valve 25 described above. It has a function to output.
• a discharge line 27 for discharging nitrogen gas separated from liquid nitrogen in the container is provided with a displacement control valve 28. It is installed via The discharge line 27 is a line 29 for discharging nitrogen gas to the mixer 1 and a line 30 for discharging nitrogen gas to the coarse aggregate bin 4.
• the valve 29 is attached to the pipe 29 which is branched to the pipe 29, and the valve 32 is attached to the pipe 30 so that the valves 31 and 32 are opened and closed.
• Gas-liquid separator 1 depending on opening adjustment? Nitrogen gas inside is discharged to the mixer 1 or the coarse aggregate bin 4 as appropriate.
• the 10 'gas-liquid separation 3 ⁇ 4 1-High pressure nitrogen gas supply source? , 3 is connected to the pressure pipe 3, and is connected to the 2> f path 34.
• R Open the valve 35: high according to Pressure
• Nitrogen gas is introduced into the gas-liquid separator 17.
• the high pressure nitrogen gas supply source 33 can be a bomb containing a suitable amount of liquid nitrogen, and the nitrogen gas in the bomb is supplied to the pipeline 3. It is better to lead to 4. In this way, nitrogen gas at an appropriate high pressure is supplied to the gas-liquid separator 17, so that the liquid nitrogen in the gas-liquid separator 17 is reduced to a minimum. The pressure for pumping liquid to the mixer 1 is secured.
• the discharge line 27 and the high-pressure nitrogen gas inlet line 34 are also located near the connection point where they are connected to the gas-liquid separator ⁇ 7.
• the hoses 36 and 37 are powerfully interposed, and the weight of the gas-liquid separator 1.7 cuts off the edges of the pipes 27 and 34. It is designed to work on the sensation 18.
• Reference numeral 38 in the figure indicates a level detector for liquid nitrogen in the gas-liquid separator 17.
• Numeral 39 denotes a valve interposed in the primary supply pipe 21, and when the valve 21 is opened or closed, liquid nitrogen from the liquid nitrogen source 16 is opened. The power supply is started and stopped.
• the true weight of the liquid nitrogen supplied to the mixer 1 can be measured.
• the increase in the weight measured at load cell 18 indicates a change in the weight of liquid nitrogen, and therefore, the increase in the weight of liquid nitrogen is added to mixer 1 of kneading ⁇ . From the difference between the weight of the point when the line of body nitrogen was started and the weight of the point
• the nozzles 23 record the desired known amount of liquid nitrogen and the desired rate of supply of the liquid nitrogen in the batch. If the liquid nitrogen supply control valve 25 is controlled according to this recorded value, the required liquid nitrogen at the batch can be accurately determined. Can be supplied. Especially in the case of this equipment, accurate control of the end point is achieved because the disturbance due to gasified nitrogen gas is removed during the supply of liquid nitrogen. it can . Then, referring to the actual material temperature detected value by the temperature sensor 124, the most desirable actual control mode (liquid) for each batch is considered.
• the amount of nitrogen supplied and the supply rate of nitrogen were updated as the latest known information, and the amount of liquid nitrogen used and the operating speed of each batch were controlled. If panel 23 is configured to accumulate and record, the optimal control of the kneading device can be achieved. Furthermore, the nitrogen gas that has been gasified in the mixer 1 and the nitrogen gas that has been collected by the gas-liquid separator 17 are injected into the mixer 1. Can be used to cool the material before it is cooled, and all of the sensible heat and latent heat of the liquid nitrogen can be used to cool the concrete. it can .
• the liquid nitrogen that is really necessary for producing the cooling concrete using the liquid nitrogen as a cooling source is provided. It is possible to accurately control the supply of liquid nitrogen and to control the supply of high-value liquid nitrogen without waste. Dedicated to high quality matte concrete structures.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Structural Engineering (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=15072054

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Cited By (3)

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Citations (1)

• 1988
  • 1988-10-08 JP JP13203888U patent/JPH0518102Y2/ja not_active Expired - Lifetime
• 1989
  • 1989-10-07 WO PCT/JP1989/001035 patent/WO1990003875A1/ja unknown

Patent Citations (1)

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