A production control method and device for fresh concrete

Abstract

The present invention discloses a production control method and device for fresh concrete, wherein the mixed dry materials are loaded into the tank of a concrete transport vehicle according to the concrete mix ratio, and the admixture and water are respectively loaded into the admixture storage box and the water storage tank provided on the concrete transport vehicle; when the transport vehicle arrives at the construction site, or when the intelligent control device provided on the transport vehicle detects that the transport vehicle arrives at the designated location, or when the set feeding time is reached, or when the transport vehicle is in transit, and the intelligent control device calculates that the time required to arrive at the target construction site is less than the set time, the preset amount of admixture and water are automatically added from the admixture storage box and the water storage tank into the tank under the control of the intelligent control device, and the tank is rotated for mixing; after the concrete is tested to be qualified at the construction site, pumping construction is carried out. The present invention alleviates the pumping problem caused by the large slump loss of concrete, and saves the equipment investment and environmental protection facility investment of concrete production enterprises.

Description

Technical Field

[0001] The invention belongs to the field of concrete production, and in particular relates to a production control method and device for fresh concrete. Background Art

[0002] Concrete is the largest building material, which is made by mixing, transporting and pouring cement and admixture powders, sand and gravel and other coarse and fine aggregates, admixtures and water. With the increasing scale of capital construction and the need for environmental protection, natural sand and gravel and other coarse and fine aggregates for concrete are almost exhausted and prohibited from mining. The application of machine-made coarse and fine aggregates has become a common trend. High-quality admixtures such as mineral powder and fly ash are far from meeting the needs of engineering construction, resulting in the large-scale use of various waste slag powders and ore powders. In order to reduce costs, various concrete production companies and construction units also use a large number of low-quality aggregates and admixtures, which causes the performance of freshly mixed concrete to change quickly and the concrete performance is difficult to control.

[0003] At present, there is a certain distance between concrete production enterprises and construction sites. It is very common to be 20 kilometers apart. In addition to the normal traffic jam and other subjective and objective reasons causing vehicle waiting, the time difference from concrete mixing production to concrete pouring is often several hours, and 1 to 2 hours is the norm. The performance of concrete is constantly changing from the beginning of water addition, from a flowable state to the formation of the required engineering entity. Before concrete pouring, it is necessary to ensure that the concrete is in a flowable state and should have a suitable slump, that is, the slump loss of concrete should not be too large. However, after a long period of waiting, the slump loss of freshly mixed concrete is often large, and even construction is impossible. Therefore, how to reduce the slump loss of concrete becomes a very difficult problem. The current status of raw materials has aggravated this difficulty, making the quality control of freshly mixed concrete and solid concrete much more difficult, such as poor concrete workability, increased slump loss, increased concrete segregation and bleeding, increased admixture dosage and increased cost, and the quality of freshly mixed concrete before entering the pump is difficult to control. The phenomenon of adding water at will on the construction site has increased, which ultimately leads to large fluctuations in the quality of solid concrete and many quality accidents, which seriously affect the quality of engineering construction.

[0004] At present, the measure to control the rapid changes in the properties of freshly mixed concrete is to use excessive amounts of admixtures such as retarders and slump retainers. However, as the raw materials change, the effect is far from ideal, and sometimes it backfires and causes quality accidents in the actual concrete. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings and defects mentioned in the above background technology and provide a production control method and device for fresh concrete, so that the performance of the fresh concrete before entering the pump changes little, fundamentally alleviating the problem of large slump loss of concrete.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A production control method for fresh concrete comprises the following steps:

[0008] S1. Load the mixed dry materials into the tank of the concrete transport vehicle according to the concrete mix ratio, and load the admixture and water into the admixture storage tank and water storage tank respectively provided on the concrete transport vehicle;

[0009] S2. When the transport vehicle arrives at the construction site, or when the intelligent control device installed on the transport vehicle detects that the transport vehicle arrives at the designated location, or when the set feeding time is reached, or when the transport vehicle is in transit and the intelligent control device calculates that the time required to reach the target construction site is less than the set time, a preset amount of admixture and water are automatically added from the admixture storage tank and the water storage tank into the tank body under the control of the intelligent control device, respectively, and the tank body is rotated for mixing;

[0010] S3. Pumping construction shall be carried out after the concrete is tested and found to be qualified on site.

[0011] Furthermore, the time from adding the admixture and water into the tank to starting the pumping construction is controlled to not exceed 30 minutes.

[0012] A production control device for fresh concrete provided by the present invention comprises a feeding device and an intelligent control device arranged on a concrete transport vehicle, wherein the feeding device comprises an admixture storage tank, a water storage tank, a first sensor, a second sensor and a pressure pump, the admixture storage tank is provided with an outlet valve, and the water storage tank is provided with a water outlet valve;

[0013] The first sensor and the second sensor are used to measure the amount of the admixture and water flowing out of the outlet valve and the water outlet valve, respectively, and the pressure pump is used to pump the flowing admixture and water into the tank of the concrete transport vehicle;

[0014] The intelligent control device is used to control the feeding device to add a preset amount of admixture and water into the tank body and rotate the tank body when the transport vehicle arrives at the construction site, or when it is detected that the transport vehicle has arrived at the designated location, or when the set feeding time is reached, or when the transport vehicle is in transit and calculates that the time required to arrive at the target construction site is less than the set time.

[0015] Furthermore, the sensor is a weighing sensor for measuring the mass of the additive and water flowing out of the additive storage tank and the water storage tank.

[0016] Furthermore, the sensor is a liquid level sensor for measuring the liquid level in the additive storage tank and the water storage tank.

[0017] Furthermore, the outlet valve and the water outlet valve are solenoid valves, and the pressure pump is a liquid delivery pump.

[0018] Furthermore, the intelligent control device includes a command control module and a positioning module for detecting the real-time position of the transport vehicle.

[0019] Furthermore, the intelligent control device also includes a communication module for realizing remote control of the feeding device.

[0020] The present invention loads the dry raw materials of concrete, cement, coarse and fine aggregates, and admixtures into trucks after proportioning and metering, and then adds the required admixtures and water into the tank body through an intelligent control device and a feeding device after transporting them to the construction site or during transportation, and rotates the tank body to perform pumping construction after the required performance indicators are met. Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Intelligent control enables concrete to be used immediately after mixing. The performance of freshly mixed concrete before entering the pump changes little, which fundamentally alleviates the pumping problem caused by large slump loss of concrete. This not only reduces the cost of using admixtures, but more importantly, solves a large number of problems caused by performance changes of freshly mixed concrete, such as poor fluidity resulting in low strength due to arbitrary water addition, pump blockage and pipe removal resulting in inability to pour, and even if pumping construction is possible, it is easy to cause problems such as honeycombs, pockmarks, peeling and dusting on the surface of the concrete, which seriously affects the quality of the concrete entity and even causes immeasurable losses.

[0022] 2. The original concrete transport truck has been running non-stop from loading to unloading, sometimes for several hours, which seriously wastes energy. The present invention transfers the mixing function of the original mixing station to the concrete transport truck for natural mixing. At the same time, the time for adding materials and rotating mixing can be determined according to the time of pumping and pouring, which is more beneficial for long-distance transportation.

[0023] 3. Save the investment in production equipment and environmental protection equipment of concrete production enterprises, and greatly improve the production environment. The main equipment of the mixing station can be omitted, the noise pollution is reduced, and there is no wet material and wastewater pollution.

[0024] 4. Further, it can realize the integration of mine stone plant-cement-admixture, or cement plant-admixture-sand and gravel, or admixture plant-cement-sand and gravel, that is, other materials are purchased from the stone plant (or cement plant, admixture plant) to prepare concrete mixture, and the concrete transport truck transports it to the construction site, and water and admixtures are added at the set time or when it arrives at the destination to realize the intelligent control of fresh concrete. This can save the construction of mixing stations, and can remotely and intelligently control the entire production, transportation and pouring of concrete, which is of great significance to the industrial automation and intelligence of the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of a concrete transport vehicle of the present invention;

[0027] Figure 2 It is a schematic diagram of a feeding device according to a specific embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a delivery pipeline of a specific embodiment of the present invention;

[0029] Among them: 1. tank body; 2. admixture storage box; 3. water storage tank; 4. first weighing sensor; 5. second weighing sensor; 6. pressure pump; 21. inlet valve; 22. outlet valve; 31. water inlet valve; 32. water outlet valve; 71. main conveying line; 72. terminal branch pipe; 73. pneumatic device. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0031] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the convenience of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0032] In order to solve the problem that the performance of freshly mixed concrete is difficult to control due to factors such as deterioration of raw material quality and long distance of concrete transportation in current concrete production enterprises, the present invention proposes the following concrete production method and device, including raw material batching, transportation, intelligent control of feeding, rotating mixing, detection and pumping, etc.

[0033] In a specific embodiment, the steps include:

[0034] The first step is to weigh cement, coarse and fine aggregates, admixtures and other dry materials according to the concrete mix ratio to obtain a mixed material, which is loaded into the tank of the concrete transport truck. The admixture (uniform liquid substance) and water are loaded into the feeding device on the concrete transport truck and transported to the construction site.

[0035] Before concrete production, concrete trial mixing tests must be carried out according to the concrete strength requirements and construction requirements to be achieved and the quality of each batch of raw materials to obtain the concrete mix ratio. The raw materials, coarse and fine aggregates, must be dry materials. The common ones now are machine-made sand and gravel, which can meet the requirements. If the raw materials contain a small amount of water, it is better not to cause the powdery materials to agglomerate and clump. The weighing and adding sequence is preferably the order of fine aggregate, cement and admixtures, powder materials, and coarse aggregate. The resulting mixture can be pre-mixed or not.

[0036] In the second step, the intelligent control device controls the feeding device to add the required admixtures and water, and rotates the tank body for natural mixing.

[0037] The third step is to test the slump of concrete and observe its workability before the concrete enters the pump. Pumping construction can be carried out after it meets the requirements. Usually, a slump meter is used to test its fluidity and observe its workability. An intelligent concrete tester can be used to test the performance of freshly mixed concrete in the vehicle. After passing the quality test, it can be pumped and poured.

[0038] like Figure 1 and 2 In a specific embodiment, a tank body 1 and a feeding device are provided on a concrete transport vehicle, and the feeding device includes: an admixture storage tank 2, a water storage tank 3, a first weighing sensor 4, a second weighing sensor 5, and a pressure pump 6.

[0039] An inlet valve 21 is provided at the top of the admixture storage tank 2 for adding admixtures into the admixture storage tank 2. A water inlet valve 31 is provided at the top of the water storage tank 3 for adding water into the water storage tank 3. An outlet valve 22 is provided at the bottom of the admixture storage tank 2, and a water outlet valve 32 is provided at the bottom of the water storage tank 3. The outlet valve 22 and the water outlet valve 32 are electromagnetic valves. After the outlet valve 22 and the water outlet valve 32 are opened, the admixture in the admixture storage tank 2 and the water in the water storage tank 3 are combined into the main conveying line 71 and pumped into the tank body 1 by the pressure pump 6 to mix with the concrete dry material.

[0040] The container volume of the charging device on the concrete transport vehicle must be larger than the maximum volume of the admixture and water required for the concrete of the vehicle. More importantly, the volume of the admixture storage tank 2 must be larger than the amount of admixture required for the whole vehicle concrete.

[0041] A first weighing sensor 4 is disposed at the bottom of the additive storage tank 2 to weigh the mass of the additive flowing out of the additive storage tank 2. A second weighing sensor 5 is disposed at the bottom of the water storage tank 3 to weigh the mass of the water flowing out of the water storage tank 3.

[0042] The outlet valve 22, the water outlet valve 32, the first weighing sensor 4, the second weighing sensor 5, and the pressure pump 6 are controlled by the command control module.

[0043] The intelligent control device includes: a positioning module, a command control module, and a communication module, which can interact with remote devices such as mobile phones and computers to achieve remote control.

[0044] In the above embodiment, the control process of the intelligent control and feeding device is as follows: input corresponding data into the intelligent control device, such as the target location, the amount of feeding, the rotation time and other data, and when the positioning module detects that the transport vehicle enters the designated location, it sends a signal to the command control module. The feeding device starts to work, the outlet valve 22 and the water outlet valve 32 are opened, and the weighing sensor starts to weigh at the same time. The pressure pump pumps the outflowing admixture and water into the tank truck, and continuously rotates the tank body to fully mix the materials. When the outflowing admixture and water displayed by the weighing sensor reach the set mass, the outlet valve 22 and the water outlet valve 32 are closed. After the last admixture and water pump in the pipeline are delivered, the entire feeding process is completed, and thereafter the tank body should continue to rotate to the required slump.

[0045] In addition to using weighing sensors to measure the amount of admixture and water, liquid level sensors can also be used. For example, liquid level sensors are set on the top of the admixture storage tank 2 and the water storage tank 3, and the liquid level difference measured by the liquid level sensor is converted into the amount of liquid flowing out for measurement.

[0046] In one embodiment, the main delivery line 71 and the terminal branch line 72 at the end thereof are at a certain angle. The main delivery line 71 and the terminal branch line 72 are movably connected, such as Figure 3 , the end of the terminal branch pipe 72 can rotate a certain angle in the direction away from the main conveying line 71. In a specific embodiment, when it is necessary to add additives and water to the tank body 1, the terminal branch pipe 72 is pushed away from the main conveying line 71 by a pneumatic device 73 (such as a pneumatic valve) provided at the movable connection between the main conveying line 71 and the terminal branch pipe 72 under the control of the command control module, so that it rotates a certain angle and faces the top of the feed port of the tank body 1. When the addition of additives and water is completed, the terminal branch pipe 72 returns to its original position. The terminal branch pipe 72 can move freely to accurately and conveniently add materials, and also prevents obstruction when adding dry materials to the tank body 1.

[0047] According to the actual situation, the time to add admixtures and water can also be determined according to the time when the concrete enters the pump after the transport tanker arrives at the construction site. The feeding time is input into the intelligent control device. When the feeding time is reached, the command control module controls the feeding, and the tank body is continuously rotated to fully mix the materials to achieve the purpose of uniform concrete and form fresh concrete with good workability.

[0048] In addition to adding materials and rotating the vehicle when it arrives at the construction site, it is also possible to add materials and rotate the vehicle when it is a certain distance from the destination during transportation, such as 30 minutes away from the destination. This can save construction time without causing slump loss and performance degradation. Adding materials and rotating the vehicle can be achieved through positioning. For example, the positioning module detects the real-time position of the transport vehicle and predicts the time to arrive at the destination based on the preset route. When the vehicle is 30 minutes away from the destination, adding materials and rotating the vehicle are automatically performed.

[0049] The method and device of the present invention are of great significance for alleviating the slump loss of pumped concrete and pumping construction, and saving the equipment investment and environmental protection facility investment of concrete production enterprises.

[0050] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A production control method for fresh concrete, characterized in that: The steps include: S1. Load the mixed dry materials into the tank of the concrete transport vehicle according to the concrete mix ratio, and load the admixtures and water into the admixture storage tank and water storage tank respectively provided on the concrete transport vehicle. The time for adding admixtures and water is to ensure good workability of the concrete during pumping construction; S2. When the transport vehicle arrives at the construction site, or when the intelligent control device installed on the transport vehicle detects that the transport vehicle arrives at the designated location, or when the set feeding time is reached, or when the transport vehicle is in transit and the intelligent control device calculates that the time required to reach the target construction site is less than the set time, a preset amount of admixture and water are automatically added from the admixture storage tank and the water storage tank into the tank body under the control of the intelligent control device, respectively, and the tank body is rotated for mixing; S3. Pumping construction shall be carried out after the concrete is tested and found to be qualified on site.

2. The production control method of fresh concrete according to claim 1, characterized in that: The time from adding admixtures and water into the tank to starting pumping construction should not exceed 30 minutes.

3. A production control device for fresh concrete, characterized in that: It includes a feeding device and an intelligent control device arranged on a concrete transport vehicle, the feeding device includes an admixture storage tank, a water storage tank, a first sensor, a second sensor and a pressure pump, the admixture storage tank is provided with an outlet valve, and the water storage tank is provided with a water outlet valve; The first sensor and the second sensor are used to measure the amount of the admixture and water flowing out of the outlet valve and the water outlet valve, respectively, and the pressure pump is used to pump the flowing admixture and water into the tank of the concrete transport vehicle; The intelligent control device is used to control the feeding device to add a preset amount of admixture and water into the tank body and rotate the tank body when the transport vehicle arrives at the construction site, or when it is detected that the transport vehicle arrives at the designated location, or when the set feeding time is reached, or when the transport vehicle is in transit and it is calculated that the time required to arrive at the target construction site is less than the set time. The intelligent control device includes a command control module and a positioning module for detecting the real-time position of the transport vehicle. The intelligent control device also includes a communication module for realizing remote control of the feeding device.

4. The production control device for fresh concrete according to claim 3, characterized in that: The sensor is a weighing sensor, which is used to measure the mass of the admixture and water flowing out of the admixture storage tank and the water storage tank.

5. The production control device for fresh concrete according to claim 3, characterized in that: The sensor is a liquid level sensor, which is used to measure the liquid level in the additive storage tank and the water storage tank.

6. The production control device for fresh concrete according to any one of claims 3 to 5, characterized in that: The outlet valve and the water outlet valve are electromagnetic valves, and the pressure pump is a liquid delivery pump.

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