Concrete step-by-step feeding and stirring device and process method

Abstract

The invention discloses a concrete step-by-step feeding and stirring device and a process method, and relates to the technical field of concrete production, in particular to the concrete step-by-step feeding and stirring device and the process method. Comprising a coarse aggregate conveying device and a fine aggregate conveying device, the aggregate storage hopper comprises a fine aggregate chamber and a coarse aggregate chamber, the fine aggregate chamber and the coarse aggregate chamber are vertically designed and are divided through a first valve, the coarse aggregate chamber is arranged on the upper portion of the first valve, the fine aggregate chamber is arranged on the lower portion of the first valve, a discharging opening is formed in the lower portion of the fine aggregate chamber, and a second valve is arranged on the discharging opening. The discharge port is connected with the stirring pot; the mixing pot is also connected with a cement conveying device and a water conveying device; a step-by-step mixing process is adopted, so that the quality of the concrete is improved; the aggregate storage hopper is simple in structure, and aggregate can enter the stirring pot more conveniently; due to the design that the coarse aggregate is arranged on the upper portion and the fine aggregate is arranged on the lower portion, the fine aggregate chamber is scoured when the coarse aggregate is fed, and retention and deposition of the fine aggregate on the side wall of the fine aggregate chamber are avoided.

Description

Technical Field

[0001] This invention relates to the field of concrete production technology, specifically a concrete step-by-step feeding and mixing device and process. Background Technology

[0002] Concrete mixing equipment has become increasingly sophisticated in terms of technical performance and automated operation and control. In existing concrete mixing processes, a batching machine is used to separately measure cement, fly ash, mineral powder, sand, aggregate, water, and additives in various states. Coarse and fine aggregates are conveyed by belt conveyors to storage hoppers, and then fed into the mixing equipment for mixing. After mixing to a certain standard, the mixture is unloaded into concrete mixer trucks. This mixing process makes it difficult to fully improve the dispersibility of cement, resulting in incomplete hydration and easy disruption of the interface between cement paste and aggregates.

[0003] A comprehensive analysis of different mixing processes revealed that by mixing mortar or cement paste at high speed and then mixing concrete at low speed, the cement can be fully hydrated, resulting in improved concrete strength and reduced cement consumption. Compared to traditional mixing methods, multi-step mixing can increase concrete strength by approximately 10%. Even with a 15% reduction in cement usage, multi-step mixing can still achieve acceptable concrete strength.

[0004] Chinese invention patent application number CN2019215849546 discloses a dual-outlet aggregate transition bin, characterized in that: the aggregate transition bin body is provided with a bin body partition plate, which divides the transition bin body into a transition aggregate bin and a transition sand bin according to the ratio of aggregate to sand required for mixing concrete, with the transition aggregate bin being higher than the transition sand bin; the transition bin body is provided with two discharge gate devices below, including a aggregate bin discharge gate device for controlling the opening and closing of the transition aggregate bin discharge port and a sand bin discharge gate device for controlling the opening and closing of the transition sand bin discharge port. This dual-outlet aggregate transition bin, when aggregate enters the transition bin first, fills the aggregate bin. When sand enters the transition bin, it overflows into the sand bin through the overflow of the aggregate bin, realizing batch feeding of aggregate into the main unit and meeting the secondary feeding requirements of sand and aggregate in the mortar-coated stone method.

[0005] The aggregate transition bin is longitudinally divided into a transition stone bin and a transition sand bin, with the space of both bins remaining constant. The feeding process is as follows: coarse aggregate (stone) is unloaded first, and after the stone bin is full, fine aggregate (sand) is unloaded last, with the separation of coarse and fine aggregates achieved through overflow. This method requires that the stone bin be completely full each time it is filled; otherwise, fine aggregate will enter the transition stone bin. When the ratio of fine aggregate to coarse aggregate is small, production can proceed with the transition sand bin remaining partially full. However, when the ratio of fine aggregate to coarse aggregate is large, production will be impossible. When unloading into the transition silo, gravel is added first, followed by sand. However, during the secondary feeding and mixing, sand must be added first, followed by gravel. The process requires waiting for all coarse and fine aggregates to arrive before the step-by-step feeding and mixing can begin, which takes a long time and greatly reduces production efficiency. If the fine aggregate (sand) contains moisture, a layer of clumps will adhere to the wall of the transition silo after prolonged use, requiring the addition of a vibrator and increasing costs. Long-term use also necessitates manual entry into the silo for cleaning, which not only disrupts normal production but also poses significant safety hazards. Summary of the Invention

[0006] This invention provides a concrete step-by-step mixing device and process, which aims to improve the quality of concrete by using a step-by-step mixing process to accommodate different proportions of concrete.

[0007] This invention provides a concrete step-by-step feeding and mixing device, including a coarse aggregate conveying device and a fine aggregate conveying device. The coarse aggregate conveying device and the fine aggregate conveying device share a set of conveying devices and are connected to an aggregate storage hopper. The aggregate storage hopper includes a fine aggregate chamber and a coarse aggregate chamber, which are vertically designed and separated by a first valve. The upper part of the first valve is the coarse aggregate chamber, and the lower part is the fine aggregate chamber. A discharge port is provided below the fine aggregate chamber, and a second valve is provided on the discharge port. The discharge port is connected to a mixing pot. A cement conveying device and a water conveying device are also connected to the mixing pot. The coarse aggregate conveying device, fine aggregate conveying device, first valve, second valve, mixing pot, cement conveying device, and water conveying device are all connected to a control terminal.

[0008] Furthermore, the mixing pot is connected to a mineral powder conveying device, a fly ash conveying device, and an additive conveying device, all of which are connected to a control terminal.

[0009] Furthermore, the coarse aggregate conveying device, fine aggregate conveying device, cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device, and additive conveying device all have metering functions.

[0010] Furthermore, the coarse aggregate conveying device and the fine aggregate conveying device are connected to a flat belt conveyor, the flat belt conveyor is connected to an inclined belt conveyor, and the inclined belt conveyor is connected to a mixing pot.

[0011] Furthermore, the first valve includes a rotating shaft and a baffle. The rotating shaft is disposed inside the aggregate storage hopper, and a first valve plate is disposed on the rotating shaft. The size of the first valve plate corresponds to the size of the aggregate storage hopper. One end of the rotating shaft extends out of the aggregate storage hopper and is connected to a geared motor, which is connected to a control terminal.

[0012] Furthermore, the coarse aggregate conveying device, fine aggregate conveying device, cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device, additive conveying device, first valve, and second valve are all connected to the control terminal.

[0013] Furthermore, the process method based on a concrete step-by-step feeding and mixing device includes the following steps: a. Input the formula ratio in the control terminal, set the feed speed n1 of the mixing pot, the first mixing speed n2, the second mixing speed n3, the loading speed n4, the fine aggregate feeding time t1, the first mixing time t2, the coarse aggregate feeding time t3, the second mixing time t4, and the loading time t5; start the system; b. The control terminal sends a signal to close the second valve and open the first valve upward; the mixing pot rotates at the feeding speed n1, and the flat belt conveyor and inclined belt conveyor operate; the fine aggregate conveying device conveys fine aggregate to the fine aggregate chamber according to the set amount, taking t1. c. Close the first valve, and the coarse aggregate conveying device will convey coarse aggregate to the coarse aggregate chamber according to the set amount, taking time t2; d. The second valve is opened, and the mixing speed of the mixing pot increases from the feeding speed n1 to the first mixing speed n2. Fine aggregate enters the mixing pot. The cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device and additive conveying device respectively convey the set amount of cement, water, mineral powder, fly ash and additives to the mixing pot. The first mixing time is t3. e. The first valve opens downwards, and the mixing speed of the mixing pot decreases from the first mixing speed n2 to the second mixing speed n3, allowing the coarse aggregate to enter the mixing pot; the water conveying device and the additive conveying device respectively convey the set amount of water and additives to the mixing pot, and the second mixing time is t4. f. The mixing speed is reduced from the second mixing speed n3 to the loading speed n4, and the time for loading concrete is t5. g, repeat bf.

[0014] Furthermore, step c and step b are performed simultaneously.

[0015] Furthermore, either step f or step bc can be performed simultaneously.

[0016] Furthermore, the opening and closing of the first and second valves, and the presence or absence of material in the coarse aggregate chamber and fine aggregate chamber are detected by sensors. If the status does not match the current step, the next action cannot be performed and an alarm is issued.

[0017] This invention provides a concrete mixing device and process with stepwise feeding, suitable for mixing concrete with different formulation ratios and weights. The stepwise mixing process improves concrete quality. The aggregate storage hopper has a simple structure, facilitating aggregate entry into the mixing pot. The design with coarse aggregate on top and fine aggregate at the bottom flushes the fine aggregate chamber during coarse aggregate feeding, preventing fine aggregate from accumulating on the side walls. This invention offers advantages such as convenient operation and high efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device layout of the present invention; Figure 2 This is a schematic diagram of the aggregate storage hopper of the present invention; Figure 3 This is a schematic diagram of the structure of the first valve of the present invention; Figure 4 This is a process flow diagram of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 The diagram shows a layout of a concrete step-by-step feeding and mixing device, which includes a coarse aggregate conveying device 10 and a fine aggregate conveying device 11. Both the coarse aggregate conveying device and the fine aggregate conveying device have metering functions. The coarse aggregate conveying device and the fine aggregate conveying device are connected to the aggregate storage hopper via a conveyor belt. like Figure 2 As shown, the main body of the aggregate storage hopper is rectangular, with a cone shape at the bottom. A discharge port 9 is set at the very end of the cone, and a second valve 2 is set on the discharge port. A first valve 1 is set in the rectangular section. The first valve divides the aggregate storage hopper into a fine aggregate chamber 3 and a coarse aggregate chamber 4. The upper part of the first valve is the coarse aggregate chamber, and the lower part of the first valve is the fine aggregate chamber.

[0021] The first valve is installed inside the aggregate storage hopper, including a rotating shaft 5 near the side wall of the aggregate storage hopper, a first valve plate 6 is installed on the rotating shaft, and the size of the first valve plate corresponds to the size of the cross-section of the aggregate storage hopper at its location; one end of the rotating shaft extends outside the aggregate storage hopper, and a geared motor 7 is installed outside the aggregate storage hopper. The output end of the geared motor is connected to the rotating shaft. Driven by the geared motor, the first valve can be opened upwards, opened downwards, and closed.

[0022] The end face of the discharge port 9 is arc-shaped. The second valve includes an arc-shaped second valve plate 8. Side plates are provided on both sides of the second valve plate. A hinge shaft is fixedly provided at the discharge port. Interchange holes are provided on the side plates so that the second valve is hinged to the aggregate storage hopper. A reduction motor 7 is fixedly installed on the side plates. The output end of the reduction motor is connected to the hinge shaft. The motor drives the second valve to rotate, thereby realizing the opening and closing of the second valve. Obviously, the mixing pot is also connected to a cement conveying device 12, a water conveying device 13, a mineral powder conveying device 14, a fly ash conveying device 15, and an additive conveying device 16. All the aforementioned coarse aggregate conveying devices, fine aggregate conveying devices, cement conveying devices, water conveying devices, mineral powder conveying devices, fly ash conveying devices, and additive conveying devices have metering functions. All of these devices, including the coarse aggregate conveying device, fine aggregate conveying device, mineral powder conveying device, fly ash conveying device, additive conveying device, first valve, second valve, mixing pot, cement conveying device, and water conveying device, are connected to a control terminal to facilitate control of the conveying quantity and conveying time.

[0023] Sensors are installed in the first valve, the second valve, the fine aggregate chamber, and the coarse aggregate chamber to detect whether the first valve and the second valve are in the set state, and whether there is material in the fine aggregate chamber and the coarse aggregate chamber. When the valve is stuck, not in the set position, or the material status in the fine aggregate chamber and the coarse aggregate chamber does not match the setting, an alarm will be triggered and the machine will be stopped to avoid production accidents.

[0024] The process method of a concrete step-by-step feeding and mixing device based on the above includes the following steps: Step 1: Input the formula ratio into the control terminal, set the feed speed n1 of the mixing pot, the first mixing speed n2, the second mixing speed n3, the loading speed n4, the fine aggregate feeding time t1, the first mixing time t2, the coarse aggregate feeding time t3, the second mixing time t4, and the loading time t5; start the system. The second step is to send a signal from the control terminal to close the second valve and open the first valve upwards; the mixing pot rotates at the feeding speed n1, and the flat belt conveyor 17 and the inclined belt conveyor 18 operate. The sensors of the first and second valves will send an open status signal, and the sensors of the coarse aggregate chamber and the fine aggregate chamber will send a signal to the control terminal indicating whether there is aggregate. The second valve will close, the first valve will open upwards, and when the coarse aggregate chamber and the fine aggregate chamber show no material, the fine aggregate conveying device will convey fine aggregate to the fine aggregate chamber according to the set amount for t1. If the status does not match, the machine will stop and alarm. Third step: The control terminal sends a signal to close the first valve; The sensors of the first and second valves will send open status signals, and the sensors of the coarse aggregate chamber and the fine aggregate chamber will send aggregate presence / absence signals to the control terminal. When the first valve is closed, the second valve is closed, the coarse aggregate chamber shows no material, and the fine aggregate chamber shows material, the coarse aggregate conveying device will convey coarse aggregate to the coarse aggregate chamber according to the set amount, taking time t2. At the same time, the second valve will open, and the mixing speed will increase from the feeding speed n1 to the first mixing speed n2, and the fine aggregate will enter the mixing pot. The cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device, and additive conveying device will respectively convey the set amount of cement, water, mineral powder, fly ash, and additive to the mixing pot, taking time t3 for the first mixing. If the status does not match, the machine will stop and alarm. Step 4: The control terminal sends a signal, and the first valve opens downwards; The sensors of the first and second valves will send open status signals, and the sensors of the coarse aggregate chamber and the fine aggregate chamber will send feedback signals on the presence or absence of aggregate to the control terminal. The first valve opens downwards, the second valve opens, and the mixing speed of the mixing pot decreases from the first mixing speed n2 to the second mixing speed n3, allowing the coarse aggregate to enter the mixing pot. The water conveying device and the additive conveying device respectively deliver the set amount of water and additive to the mixing pot. The second mixing takes t4. If the status does not match, the machine will stop and an alarm will sound. Step 5: The mixing speed of the mixing pot is reduced from the second mixing speed n3 to the loading speed n4, and the time for loading the concrete is t5; at the same time, step 2 is carried out. Step 6: Repeat steps 3 to 5, and the concrete is continuously produced and loaded onto trucks through the concrete step-by-step feeding and mixing device provided by this invention.

[0025] It is obvious that the metering functions of coarse aggregate conveying devices, fine aggregate conveying devices, cement conveying devices, water conveying devices, mineral powder conveying devices, fly ash conveying devices, and additive conveying devices are common knowledge in the field and can be understood and implemented by those skilled in the art, so they will not be elaborated here.

[0026] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A concrete step-by-step feeding and mixing device, comprising a coarse aggregate conveying device (10) and a fine aggregate conveying device (11), wherein the coarse aggregate conveying device and the fine aggregate conveying device share a set of conveying devices and are connected to an aggregate storage hopper; characterized in that, The aggregate storage hopper includes a fine aggregate chamber (3) and a coarse aggregate chamber (4). The fine aggregate chamber and the coarse aggregate chamber are designed vertically and are separated by a first valve (1). The upper part of the first valve is the coarse aggregate chamber and the lower part of the first valve is the fine aggregate chamber. A discharge port is provided below the fine aggregate chamber, and a second valve (2) is provided on the discharge port. The discharge port is connected to the mixing pot. A cement conveying device (12) and a water conveying device (13) are also connected to the mixing pot. The coarse aggregate conveying device, fine aggregate conveying device, first valve, second valve, mixing pot, cement conveying device, and water conveying device are all connected to the control terminal.

2. The concrete step-by-step feeding and mixing device according to claim 1, further characterized in that, The mixing pot is connected to a mineral powder conveying device, a fly ash conveying device, and an additive conveying device, all of which are connected to a control terminal.

3. The concrete step-by-step feeding and mixing device according to claim 1, further characterized in that, The coarse aggregate conveying device, fine aggregate conveying device, cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device, and additive conveying device all have metering functions.

4. The concrete step-by-step feeding and mixing device according to claim 1, further characterized in that, The coarse aggregate conveying device and the fine aggregate conveying device are connected to a flat belt conveyor, the flat belt conveyor is connected to an inclined belt conveyor, and the inclined belt conveyor is connected to a mixing pot.

5. The concrete step-by-step feeding and mixing device according to claim 1, characterized in that, The first valve includes a rotating shaft (5) and a first valve plate (6). The rotating shaft is set inside the aggregate storage hopper, and the first valve plate is set on the rotating shaft. The size of the first valve plate corresponds to the size of the aggregate storage hopper. One end of the rotating shaft extends out of the aggregate storage hopper and is connected to a geared motor (7). The geared motor is connected to a control terminal.

6. The concrete step-by-step feeding and mixing device according to claim 3, further characterized in that, The coarse aggregate conveying device, fine aggregate conveying device, cement conveying device (12), water conveying device (13), mineral powder conveying device (14), fly ash conveying device (15), and additive conveying device (16), as well as the first valve and the second valve, are all connected to the control terminal.

7. The concrete step-by-step feeding and mixing device according to claim 1 is further characterized in that, Its process includes the following steps: a. Input the formula ratio in the control terminal, set the feed speed n1 of the mixing pot, the first mixing speed n2, the second mixing speed n3, the loading speed n4, the fine aggregate feeding time t1, the first mixing time t2, the coarse aggregate feeding time t3, the second mixing time t4, and the loading time t5; start the system; b. The control terminal sends a signal to close the second valve and open the first valve upward; the mixing pot rotates at the feeding speed n1, and the flat belt conveyor and inclined belt conveyor operate; the fine aggregate conveying device conveys fine aggregate to the fine aggregate chamber according to the set amount, taking t1. c. Close the first valve, and the coarse aggregate conveying device will convey coarse aggregate to the coarse aggregate chamber according to the set amount, taking time t2; d. The second valve is opened, and the mixing speed of the mixing pot increases from the feeding speed n1 to the first mixing speed n2. Fine aggregate enters the mixing pot. The cement conveying device, water conveying device, mineral powder conveying device, fly ash conveying device and additive conveying device respectively convey the set amount of cement, water, mineral powder, fly ash and additives to the mixing pot. The first mixing time is t3. e. The first valve opens downwards, and the mixing speed of the mixing pot decreases from the first mixing speed n2 to the second mixing speed n3, allowing the coarse aggregate to enter the mixing pot; the water conveying device and the additive conveying device respectively convey the set amount of water and additives to the mixing pot, and the second mixing time is t4. f. The mixing speed is reduced from the second mixing speed n3 to the loading speed n4, and the time for loading concrete is t5. Repeat bf.

8. The concrete step-by-step feeding and mixing process according to claim 7, characterized in that, Step c and step b are performed simultaneously.

9. The concrete step-by-step feeding and mixing process according to claim 7, characterized in that, Either step f or step bc can be performed simultaneously.

10. The concrete step-by-step feeding and mixing process according to claim 7, characterized in that, The opening and closing of the first and second valves, and the presence or absence of material in the coarse aggregate chamber and fine aggregate chamber are detected by sensors. If the status does not match the current step, the next action cannot be performed and an alarm will be issued.

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