Concrete preparation system and preparation method thereof

Abstract

The invention relates to the technical field of concrete preparation, and discloses a concrete preparation system, comprising: a raw material storage and conveying unit comprising a plurality of raw material storage bins, the bottom of each raw material bin being provided with a discharge port and a first electric valve; the metering unit comprises a metering hopper and a weighing sensor located at the bottom of the metering hopper; the stirring unit comprises a double-horizontal-shaft forced stirrer serving as a stirring main machine; and the discharging and cleaning unit comprises a discharging opening located at the bottom of the stirring main machine, a third electric valve and a cleaning device comprising a high-pressure water gun and a water pipe. Through cooperation of the weighing sensor and the controller, the adding amount of all the raw materials can be accurately controlled, it is ensured that the quality of concrete is stable, and the design requirement is met; the double-horizontal-shaft forced mixer and the optimally designed mixing blades thereof can fully mix the concrete raw materials and ensure the excellent performance of the concrete; and the dust removal device can effectively collect dust generated in the preparation process, and dust pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the field of concrete preparation, and in particular to a concrete preparation system and a preparation method thereof. Background Art

[0002] Concrete is one of the most commonly used building materials in modern construction. There are many problems in the traditional concrete preparation process. For example, the measurement of raw materials is often not accurate enough, resulting in unstable quality of concrete; during the mixing process, uneven mixing will make the performance of concrete less than optimal; and the dust and noise pollution generated during the preparation process have certain hazards to the environment and the health of operators. Therefore, a concrete preparation system and method that can accurately measure raw materials, fully mix and be environmentally friendly is needed; the present invention proposes a concrete preparation system and a preparation method thereof to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a concrete preparation system and a preparation method thereof.

[0004] The present invention provides a concrete preparation system and a preparation method thereof using the following technical solutions:

[0005] A concrete preparation system comprises: a raw material storage and conveying unit, comprising a plurality of raw material bins for storing cement, sand, gravel and additives respectively, each raw material bin is provided with a discharge port and a first electric valve at the bottom, and is connected to a screw conveyor, wherein a speed sensor is provided in the screw conveyor;

[0006] A metering unit, comprising a metering hopper and a weighing sensor located at the bottom of the metering hopper, and a controller electrically connected to the weighing sensor and the first electric valve;

[0007] The mixing unit includes a twin-shaft forced mixer as a mixing main machine, a mixing blade is arranged inside the mixing main machine, and also includes a water adding device and a dust removing device;

[0008] The unloading and cleaning unit comprises a unloading port and a third electric valve located at the bottom of the mixing main unit, and a cleaning device comprising a high-pressure water gun and a water pipe. A drainage port is also arranged at the bottom of the mixing main unit, and a filter is arranged at the drainage port.

[0009] Preferably, the water adding device includes a water tank, a water pipe, a second electric valve and a flow sensor, and the controller is electrically connected to the second electric valve and the flow sensor.

[0010] Preferably, the dust removal device includes a dust hood, a dust collection duct and a dust collector.

[0011] A method for preparing concrete comprises the following steps:

[0012] S1: Raw material preparation: According to the designed mix ratio of concrete, the controller sets the opening and closing degree of the first electric valve of each raw material bin and the speed of the screw conveyor, and the raw materials are conveyed to the measuring bucket according to the set amount. The weighing sensor monitors the weight of the raw materials, and closes the corresponding first electric valve when the preset weight is reached;

[0013] S2: Mixing: Unload the measured raw materials into the mixing host, add an appropriate amount of water according to the preset water-cement ratio through the controller to control the second electric valve on the water pipe, and start the mixing host for mixing;

[0014] S3, dust removal and unloading: During the feeding and unloading process, dust is collected by the dust removal device, and the material is unloaded through the unloading port after the mixing is completed;

[0015] S4. Cleaning: After unloading is completed, the inside of the mixing main unit is cleaned using a cleaning device, and the sewage is discharged through the drain outlet.

[0016] Preferably, the stirring time is 2 minutes, and the stirring blade speed of the stirring main machine is 60 revolutions per minute.

[0017] Preferably, the water adding device monitors the amount of water added by a flow sensor.

[0018] In summary, the present invention includes at least one of the following beneficial technical effects:

[0019] 1. Accurate measurement

[0020] Through the cooperation of weighing sensors and controllers, the amount of each raw material added can be accurately controlled to ensure that the quality of concrete is stable and meets the design requirements.

[0021] 2. Stir well

[0022] The twin-shaft forced mixer and its optimally designed mixing blades can fully mix the concrete raw materials and ensure the excellent performance of the concrete.

[0023] 3. Environmental protection

[0024] The dust removal device can effectively collect the dust generated during the preparation process and reduce dust pollution; at the same time, the cleaning device can clean the mixing host in time to avoid residual concrete from polluting the environment. DETAILED DESCRIPTION

[0025] The present invention is described in further detail below.

[0026] Embodiment 1:

[0027] A concrete preparation system and a preparation method thereof, comprising the following steps:

[0028] 1. Raw material preparation

[0029] Before starting the concrete preparation process, the various raw materials required must first be thoroughly inspected and prepared. According to the precise design mix ratio of concrete, the operator carefully sets the opening and closing degree of the first electric valve of each raw material bin and the speed parameters of the screw conveyor in the control system. The setting of these parameters is by no means arbitrary, but is based on a large amount of experimental data and engineering practice experience to determine the precise values, in order to ensure that each raw material can participate in the subsequent preparation process in the right amount.

[0030] When everything is ready, start the screw conveyor. At this time, the first electric valves at the bottom of the cement silo, sand silo, gravel silo and additive silo are opened in sequence according to the preset program, and the raw materials are slowly and orderly transported to the metering hopper under the push of the screw conveyor. In this process, the speed sensor inside the screw conveyor is always alert, accurately monitors the conveying speed, and feeds real-time data back to the control system. The weighing sensor at the bottom of the metering hopper is like a rigorous quality inspector, paying close attention to the weight changes of the raw materials entering the metering hopper. Once the weight of a certain raw material reaches the preset weight value, the control system will immediately issue an instruction, and the corresponding first electric valve will be quickly closed, thereby completing the precise metering of the raw material. For example, in a certain concrete preparation, the designed cement dosage is 300 kg. When the weighing sensor detects that the cement weight is close to 300 kg, the control system quickly adjusts the opening and closing degree of the first electric valve of the cement silo to gradually close it until it reaches 300 kg and is completely closed. Such precise metering operation ensures the accuracy of the concrete ratio.

[0031] 2. Stirring

[0032] All the raw materials that have been accurately measured in the measuring hopper are unloaded into the main mixer. This process needs to ensure that the raw materials can enter the mixing area smoothly and completely to avoid undesirable conditions such as raw material residue or blockage. Then, according to the preset water-cement ratio, the control system starts the water adding device. Under pressure, the water in the water tank flows into the inside of the main mixer through the water pipe. The second electric valve on the water pipe opens and closes accurately under the command of the control system, and the flow sensor monitors the amount of water added attentively. Assuming that the water-cement ratio of this concrete preparation is set to 0.4, if the weight of cement is 300 kg, then it can be calculated that 120 liters of water need to be added. When the flow sensor detects that the amount of water added is about to reach 120 liters, the control system will fine-tune the opening of the second electric valve in advance to gradually reduce the water flow rate until the valve is completely closed after 120 liters of water are accurately added. Subsequently, the main mixer is started, and the mixing blades in the main mixer fully mix the raw materials and water at a preset speed, such as 30 rpm. The mixing time is set to 3 minutes. During these 3 minutes, the mixing blades, with their optimized shape and angle, act like skilled dancers, causing the raw materials to tumble up and down and shuttle left and right in the mixing main unit, ensuring that the various raw materials can be fully mixed and evenly mixed. The special shape of the mixing blades can be a design with a certain curvature and bending angle. This design can produce complex fluid mechanics effects during the mixing process, prompting the raw materials to exchange and mix quickly in different directions, thereby breaking the possible agglomeration between the raw materials and making the microstructure of the concrete more uniform and stable.

[0033] 3. Dust removal and unloading

[0034] The dust removal device plays a vital role in the entire concrete preparation process, especially when the raw materials enter the mixer and the mixed concrete is discharged. When the raw materials are discharged from the metering hopper into the mixer, the dust hood with its wide opening area, such as 2 square meters, steadily covers the feed port, like an invisible large net, quickly collecting the dust that may be generated. The dust hood is closely connected to the dust collector through the dust suction pipe. Under the action of strong suction, the collected dust quickly enters the dust collector along the dust suction pipe. The dust collector adopts a high-efficiency filter bag filtration method. These filter bags have extremely small pores and can effectively block the passage of dust particles. When the dust-laden air enters the dust collector, the dust is intercepted by the filter bag and attached to the surface of the filter bag, while the clean air after filtration is smoothly discharged, ensuring the air quality of the surrounding environment. After the mixing is completed, the third electric valve of the discharge port is opened for the discharge operation. The diameter of the discharge port is carefully designed, such as 0.5 meters, which can not only ensure that the concrete can be discharged at a relatively smooth speed, but also avoid the instability of the concrete such as splashing due to the opening being too large. Accurately discharge the mixed concrete into transport vehicles or storage containers for subsequent transportation and construction use.

[0035] 4. Cleaning

[0036] After the unloading is completed, the cleaning device is immediately put into operation. The operator inserts the high-pressure water gun into the mixer and then turns on the water source. The high-pressure water gun sprays a strong water flow at a pressure of up to 5 MPa to clean the inside of the mixer in all directions without dead ends. The water flow is like a sharp scalpel, quickly washing off the concrete remaining on the inner wall of the mixer and the mixing blades. The sewage generated by the cleaning is discharged through the drain port set at the bottom of the mixer. The filter mesh installed at the drain port has an aperture of 5 mm, which can effectively filter out larger concrete particles in the sewage and prevent them from clogging the drainage pipe. At the same time, in order to ensure the cleaning effect, the spray angle and position of the high-pressure water gun can be adjusted according to the actual situation, and the key parts of the mixer can be cleaned, such as the roots of the mixing blades and the corners of the mixer where concrete is easily left. After thorough cleaning, the interior of the mixer is brand new, creating good conditions for the next concrete preparation, avoiding cross-contamination between different batches of concrete, and ensuring the stability and reliability of concrete quality.

[0037] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete preparation system, characterized in that: include: The raw material storage and conveying unit includes a plurality of raw material bins for storing cement, sand, gravel and additives respectively. Each raw material bin is provided with a discharge port and a first electric valve at the bottom and is connected to a screw conveyor. A speed sensor is provided in the screw conveyor. A metering unit, comprising a metering hopper and a weighing sensor located at the bottom of the metering hopper, and a controller electrically connected to the weighing sensor and the first electric valve; The mixing unit includes a twin-shaft forced mixer as a mixing main machine, a mixing blade is arranged inside the mixing main machine, and also includes a water adding device and a dust removing device; The unloading and cleaning unit comprises a unloading port and a third electric valve located at the bottom of the mixing main unit, and a cleaning device comprising a high-pressure water gun and a water pipe. A drainage port is also arranged at the bottom of the mixing main unit, and a filter is arranged at the drainage port.

2. A concrete preparation system according to claim 1, characterized in that: The water adding device comprises a water tank, a water pipe, a second electric valve and a flow sensor, and the controller is electrically connected to the second electric valve and the flow sensor.

3. A concrete preparation system according to claim 1, characterized in that: The dust removal device comprises a dust collection hood, a dust collection duct and a dust collector.

4. A method for preparing concrete according to any one of claims 1 to 3, characterized in that: The steps include: S1: Raw material preparation: According to the designed mix ratio of concrete, the controller sets the opening and closing degree of the first electric valve of each raw material bin and the speed of the screw conveyor, and the raw materials are conveyed to the measuring bucket according to the set amount. The weighing sensor monitors the weight of the raw materials, and closes the corresponding first electric valve when the preset weight is reached; S2: Mixing: Unload the measured raw materials into the mixing host, add an appropriate amount of water according to the preset water-cement ratio through the controller to control the second electric valve on the water pipe, and start the mixing host for mixing; S3, dust removal and unloading: During the feeding and unloading process, dust is collected by the dust removal device, and the material is unloaded through the unloading port after the mixing is completed; S4. Cleaning: After unloading is completed, the inside of the mixing main unit is cleaned using a cleaning device, and the sewage is discharged through the drain outlet.

5. A method for preparing concrete according to claim 4, characterized in that: The stirring time is 2 minutes, and the stirring blade speed of the stirring main machine is 60 revolutions per minute.

6. A method for preparing concrete according to claim 4, characterized in that: The water adding device monitors the amount of water added by means of a flow sensor.