CN215594218U

CN215594218U - Constant-pressure water supply device of concrete dry mixing stirring station

Info

Publication number: CN215594218U
Application number: CN202121375261.3U
Authority: CN
Inventors: 钟迦; 傅鑫源; 傅炳煌
Original assignee: Quangong Machinery Co Ltd
Current assignee: Quangong Machinery Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-01-21
Anticipated expiration: 2031-06-21

Abstract

The utility model relates to the technical field of liquid ingredient metering in a dry mixing and stirring station, and particularly discloses a constant-pressure water supply device for a concrete dry mixing and stirring station. The utility model can realize constant-pressure continuous water supply and accurately measure the water supply amount through the flowmeter, has more stable flow rate and more regular water discharge, can ensure the stable humidity of dry-mixed and stirred materials, avoid the condition of pilling and blocking of the materials caused by dripping, can avoid the influence of air in the pipeline on the precision of the flowmeter, improve the water supply precision, and overcome the technical defects of discontinuous water flow in the pipeline and measurement deviation caused by miscounting the air in the pipeline as the water flow due to the sudden change of the flow rate before and after the pump in the conventional water pump water supply scheme when the pump is switched on and switched off.

Description

Constant-pressure water supply device of concrete dry mixing stirring station

Technical Field

The utility model belongs to the technical field of metering of liquid ingredients in a dry mixing and stirring station, and particularly relates to a constant-pressure water supply device of a concrete dry mixing and stirring station.

Background

Along with the popularization of concrete complete equipment such as a concrete mixing plant and the like, the quality requirement of users on products is higher and higher. Particularly, the batching precision of the batching system directly related to the cost and the quality of the finished concrete is more important to the attention of users.

One of the ingredients of a concrete dry mix plant is water and the sensitivity of the amount of water supplied to the effect of the dry mix results is high. The prior art generally adopts water pump drive sluicing, discovers in the use: when the pump is switched on and switched off, the water flow in the pipeline is discontinuous due to sudden change of the flow speed before and after the pump, and in addition, the air in the pipeline is mistakenly counted as the water flow by the flow meter, so that the metering deviation is caused.

In addition, in order to obtain accurate water supply metering, the calibration of the metering scales is carried out before trial production after the concrete mixing plant is installed or after a period of working time, and the metering scales after calibration are accurate. However, in the production process, due to the influence of various factors, the mixing amount and the target amount are different during mixing, so that the powder mixing precision of a mixing system of the concrete mixing plant is low, time is required for stabilizing the scale, and the water supply metering efficiency is to be improved.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the utility model aims to provide a constant-pressure water supply device for a concrete dry mixing stirring station, which improves the water supply metering precision and the metering efficiency.

In order to solve the technical problems, the utility model adopts the technical scheme that:

the constant-pressure water supply device of the concrete dry mixing stirring station comprises a water tank, a pump-free water draining mechanism and an air inlet mechanism, wherein the air inlet mechanism is communicated to the top of the water tank and used for providing constant water supply pressure for the interior of the water tank, the pump-free water draining mechanism is communicated to the bottom of the water tank and used for supplying water outwards, and the pump-free water draining mechanism comprises a water draining pipeline, a water draining valve and a flowmeter, wherein the water draining valve and the flowmeter are arranged on the water draining pipeline.

Preferably, the pump-free water draining mechanism further comprises a coarse metering pipeline and a fine metering pipeline, the coarse metering pipeline and the fine metering pipeline are respectively communicated to a water draining pipeline at the rear end of the flowmeter, a coarse water draining valve is arranged on the coarse metering pipeline, and a fine water draining valve is arranged on the fine metering pipeline.

Preferably, the flowmeter is an Yifu gate SM7000-03 flowmeter.

Preferably, the air inlet mechanism comprises an air inlet pipeline, and a barometer and an air compressor which are arranged on the air inlet pipeline.

Preferably, the constant pressure water supply device further comprises a water inlet mechanism and an exhaust mechanism, wherein the water inlet mechanism is communicated to the upper part of the water tank and is used for supplementing water to the water tank, and the exhaust mechanism is communicated to the top of the water tank and is used for exhausting gas in the water tank.

Preferably, the water inlet mechanism comprises a water inlet pipeline and a water adding pump arranged on the water inlet pipeline.

Preferably, the exhaust mechanism comprises an exhaust pipeline and an exhaust valve arranged on the exhaust pipeline.

Further, this constant pressure water supply installation still includes PLC controller, liquid level upper limit sensor and liquid level lower limit sensor, liquid level upper limit sensor corresponds the highest water level height department that sets up in the water pitcher inside, the liquid level lower limit sensor corresponds the height that sets up in the inside lowest water level height department of water pitcher and be higher than the department that is linked together of no pump sluicing mechanism and water pitcher, sluicing valve, flowmeter, liquid level upper limit sensor and liquid level lower limit sensor all with PLC controller electric connection.

Compared with the prior art, the utility model has the following beneficial effects:

the constant-pressure water supply device comprises a water tank, a pump-free water draining mechanism and an air inlet mechanism, wherein gas is input into the water tank through the air inlet mechanism so that the internal pressure of the water tank reaches a preset water supply pressure value, the pump-free water draining mechanism is adopted, constant-pressure continuous water supply is realized, the water supply quantity is accurately metered through a flowmeter, the constant-pressure control is realized, the flow rate is more stable, the water draining is more regular, the humidity stability of dry-mixed and stirred materials can be ensured, the condition that the materials are pilling and blocking due to dripping is avoided, the influence of air on the precision of the flowmeter due to the fact that air exists in a pipeline can be avoided, the water supply precision is improved, and the technical defects that the water flow in the pipeline is discontinuous and the air in the pipeline is mistakenly counted as water flow to cause metering deviation due to the fact that the air exists in the pipeline due to the sudden change of the flow rate before and after the pump is switched on or switched off in a conventional water pump water supply scheme are overcome; simultaneously, reduced the complexity of measurement balance mechanical installation, reduced the total length of installation, and need not carry out steady balance process, avoided the acceleration that produces when execution components and parts do work to water to the influence of measurement, promoted measurement efficiency, improved the measurement accuracy.

Drawings

Fig. 1 is a schematic structural view of a constant pressure water supply apparatus according to the present invention.

Fig. 2 is a control schematic block diagram of a constant pressure water supply apparatus according to embodiment 2 of the present invention.

The labels in the figure are: 10. a water tank; 11. a liquid level upper limit sensor; 12. a liquid level lower limit sensor; 20. an air intake mechanism; 21. an air intake duct; 22. a barometer; 23. an air compressor; 30. a pump-free water discharge mechanism; 31. a water drainage pipe; 32. a water drain valve; 33. a flow meter; 34. a coarse drain valve; 35. a fine water drain valve; 40. adding a water pump; 50. an exhaust valve; 60. a PLC controller.

Detailed Description

In order to make the aforementioned and other features and advantages of the utility model more comprehensible, embodiments accompanied with figures are described in detail below.

Example 1

As shown in fig. 1, the present embodiment provides a constant pressure water supply apparatus for a concrete dry mixing plant, comprising a water tank 10, a pumpless water discharge mechanism 30 and an air intake mechanism 20, wherein the air intake mechanism 20 is connected to the top of the water tank 10 for providing a constant water supply pressure to the inside of the water tank 10, and the pumpless water discharge mechanism 30 is connected to the bottom of the water tank 10 for supplying water to the outside.

In this embodiment, the water tank 10 is a sealed integral tank or a sealable combined tank with a cover, and is made of high-strength stainless steel, and has high pressure resistance, corrosion resistance, excellent sealing performance and long service life.

In order to facilitate connection with the air inlet mechanism 20, an air inlet is formed at the top of the water tank 10 of this embodiment, and is connected with the air inlet mechanism 20 through the air inlet, wherein the air inlet is designed at the top of the water tank 10, such as on a tank cover or a tank top, but the position of the air inlet is inevitably higher than the highest liquid level of the water stored inside the water tank 10. In order to facilitate connection with the pump-free water draining mechanism 30, a water outlet is formed at the bottom of the water tank 10 in the embodiment and is connected with the pump-free water draining mechanism 30 through the water outlet, wherein the water outlet can be designed at the bottom of the tank and at the lower part of the tank wall.

In this embodiment, the air inlet mechanism 20 includes an air inlet pipe 21, and a barometer 22 and an air compressor 23 which are arranged on the air inlet pipe 21, one end of the air inlet pipe 21 is communicated and installed at an air inlet of the water tank 10, the barometer 22 is close to the air inlet, and the air compressor 23 is arranged on the air inlet pipe 21 at one side of the barometer 22 far away from the air inlet, and when the air compressor 23 is started, air can be input into the water tank 10 through the air inlet pipe 21, so that the internal pressure of the water tank 10 is gradually increased, and air inlet is stopped and a valve on the air compressor 23 is closed until a preset water supply pressure is reached.

In this embodiment, the pump-less water discharge mechanism 30 includes a water discharge pipe 31, and a water discharge valve 32 and a flow meter 33 both disposed on the water discharge pipe 31, wherein one end of the water discharge pipe 31 is connected to the water outlet of the water tank 10, the water discharge valve 32 is close to the water outlet, and the flow meter 33 is disposed on the water discharge pipe 31 at the side of the water discharge valve 32 away from the water outlet, when supplying water, the internal pressure of the water tank 10 is first made to reach a preset water supply pressure, and then the water discharge valve 32 is opened, so as to realize constant-pressure continuous water supply and accurately measure the water supply amount through the flow meter 33. Because the water pump is not adopted for supplying water to the outside, the technical defects that the water flow in the pipeline is discontinuous and the air in the pipeline is mistakenly counted as the water flow to cause the metering deviation due to the sudden change of the flow speed before and after the pump in the conventional water pump water supply scheme when the pump is switched on and switched off can be overcome. Simultaneously, in whole single water supply process, because single water supply volume is very little compared water pitcher 10 volume, no longer to water pitcher 10 pressure boost processing at single water supply in-process, this process is regarded as constant pressure water supply, and the velocity of flow is more stable, has avoided because of there being the influence of air to flowmeter 33 precision in the pipeline, improves the precision of adding water.

For the dry mixing and stirring station, an atomization nozzle is preferably arranged at the water outlet end of the water drain pipeline 31, and the condition that cement is agglomerated or nodulated due to water dropping can be avoided by adopting atomization water spraying. And this scheme constant pressure water supply of adoption can make the water atomization more thorough.

Further, the pump-free water discharge mechanism 30 further includes a coarse metering pipeline and a fine metering pipeline, the coarse metering pipeline and the fine metering pipeline are respectively communicated to the water discharge pipeline 31 at the rear end of the flow meter 33, the coarse metering pipeline is provided with a coarse water discharge valve 34, and the fine metering pipeline is provided with a fine water discharge valve 35. The atomization nozzles are respectively arranged at the water outlet end of the rough metering pipeline close to the rough water drain valve 34 and the water outlet end of the fine metering pipeline close to the fine water drain valve 35. Therefore, when water is supplied, the rough metering pipeline is started firstly to supply water for the mixing station in a rough metering mode, when the rough metering reaches the preset rough water supply amount, the rough metering pipeline is stopped immediately, meanwhile, the fine water discharge valve 35 is opened to supply water in a fine metering mode, and the water metering precision is ensured. Wherein, the coarse metering pipeline plays a role in accelerating the water supply speed and improving the working efficiency. The preset coarse water supply amount is 70-90% of the theoretical water supply amount. No redundant pipeline is left at the rear ends of the coarse drain valve 34 and the fine drain valve 35, so that the problem of deposit of non-pressurized water in the pipeline can be avoided.

The flow meter 33 of this embodiment is preferably a Yifu Meter SM7000-03 flow meter.

Still further, the constant pressure water supply apparatus further comprises a water inlet mechanism communicated to the upper portion of the water tank 10 for supplying water to the water tank 10, and an air exhaust mechanism communicated to the top of the water tank 10 for exhausting air inside the water tank 10. The water inlet mechanism comprises a water inlet pipeline and a water adding pump 40 arranged on the water inlet pipeline, and the exhaust mechanism comprises an exhaust pipeline and an exhaust valve 50 arranged on the exhaust pipeline. When the water storage in the water tank 10 is insufficient, the water adding pump 40 is started, the exhaust valve 50 is opened at the same time, the air compressor 23 and the pump-free water discharging mechanism 30 are closed, and water is added into the water tank 10.

Example 2

The embodiment 2 is an improvement made for realizing the automatic control based on the embodiment 1, and specifically includes: as shown in fig. 2, the constant pressure water supply device further comprises a PLC controller 60, a liquid level upper limit sensor 11 and a liquid level lower limit sensor 12, wherein the liquid level upper limit sensor 11 is correspondingly arranged at the highest water level inside the water tank 10, the liquid level lower limit sensor 12 is correspondingly arranged at the lowest water level inside the water tank 10 and is higher than the height of the connection part between the pump-free water discharge mechanism 30 and the water tank 10, the water discharge valve 32, the coarse water discharge valve 34, the fine water discharge valve 35 and the air discharge valve 50 are all electromagnetic valves, and the air compressor 23, the air pressure gauge 22, the water adding pump 40, the water discharge valve 32, the coarse water discharge valve 34, the fine water discharge valve 35, the air discharge valve 50, the flow meter 33, the liquid level upper limit sensor 11 and the liquid level lower limit sensor 12 are all electrically connected with the PLC controller 60. In some examples, the coarse metering line, the coarse drain valve 34, the fine metering line, and the fine drain valve 35 may not be provided.

The automatic control flow of the constant-pressure water supply device is as follows: s1, judging whether the water level of the water tank 10 is above the lower limit of the liquid level, if not, closing the air inlet mechanism 20, opening the air outlet mechanism and the water inlet mechanism to add water, and if so, executing the next step; s2, closing the exhaust mechanism and the water inlet mechanism, and opening the air inlet mechanism 20 for pressurization; s3, judging whether the pressure of the water tank 10 reaches a preset water supply pressure value or not, if not, continuously pressurizing, if so, stopping pressurizing, closing the air inlet mechanism 20, and waiting for a water supply signal; and S4, receiving the water supply signal of the mixing station, and opening the pump-free water discharge mechanism 30 to supply water.

In step S1, the end point of each water addition is that the liquid level rises to the upper limit of the liquid level, that is, the PLC controller 60 receives the sensing signal sent by the upper limit liquid level sensor 11 and controls the water inlet mechanism to stop working.

Wherein, when a scheme including a coarse metering pipeline and a fine metering pipeline is adopted, the step S4 specifically includes: controlling to open the coarse metering pipeline or simultaneously open the coarse metering pipeline and the fine metering pipeline, and executing constant-pressure coarse water supply; judging whether the preset coarse water supply amount is reached through the flowmeter 33, if not, continuing the constant-pressure coarse water supply, and if so, executing the next step; controlling to close the coarse metering pipeline and open the fine metering pipeline, and executing constant-pressure fine water supply; and stopping supplying water until the water supply reaches the theoretical required water supply amount. After the coarse drain valve 34 and the fine drain valve 35 are closed, if the flowmeter 33 is still in a metering state, an alarm is triggered, the closing of the drain valve 32 is controlled, a double protection effect is achieved, and the sealing working condition of the coarse drain valve 34 and the fine drain valve 35 is monitored.

The PLC 60 of this embodiment selects Siemens S7-1500, and easy-Foregran KI6000 is selected for both the upper liquid level limit sensor 11 and the lower liquid level limit sensor 12.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be understood by those skilled in the art that the utility model is not limited by the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. Constant pressure water supply installation of concrete dry mixing stirring station, its characterized in that: the pump-free water draining mechanism is communicated to the bottom of the water tank and used for supplying water to the outside, and comprises a water draining pipeline, a water draining valve and a flowmeter, wherein the water draining valve and the flowmeter are arranged on the water draining pipeline.

2. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 1, wherein: the pump-free water draining mechanism further comprises a rough metering pipeline and a fine metering pipeline, the rough metering pipeline and the fine metering pipeline are communicated to a water draining pipeline at the rear end of the flowmeter respectively, a rough water draining valve is arranged on the rough metering pipeline, and a fine water draining valve is arranged on the fine metering pipeline.

3. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 1, wherein: the flowmeter adopts an Yifu gate SM7000-03 flowmeter.

4. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 1, wherein: the air inlet mechanism comprises an air inlet pipeline, and a barometer and an air compressor which are arranged on the air inlet pipeline.

5. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 1, wherein: the constant-pressure water supply device also comprises a water inlet mechanism and an exhaust mechanism, wherein the water inlet mechanism is communicated to the upper part of the water tank and is used for supplementing water to the water tank, and the exhaust mechanism is communicated to the top of the water tank and is used for exhausting gas in the water tank.

6. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 5, wherein: the water inlet mechanism comprises a water inlet pipeline and a water adding pump arranged on the water inlet pipeline.

7. The constant pressure water supply apparatus for a concrete dry mixing plant according to claim 5, wherein: the exhaust mechanism comprises an exhaust pipeline and an exhaust valve arranged on the exhaust pipeline.

8. A constant pressure water supply apparatus for a concrete dry mixing plant according to any one of claims 1 to 7, wherein: this constant voltage water supply installation still includes PLC controller, liquid level upper limit sensor and liquid level lower limit sensor, liquid level upper limit sensor corresponds the highest water level height department that sets up in the water pitcher inside, the liquid level lower limit sensor corresponds the height that sets up in the inside lowest water level height department of water pitcher and be higher than the department that is linked together of no pump sluicing mechanism and water pitcher, sluicing valve, flowmeter, liquid level upper limit sensor and liquid level lower limit sensor all with PLC controller electric connection.