Mobile concrete mixer with sandwich material storage and material flow configuration

Abstract

"A mobile concrete mixer with sandwich-type material storage and material flow configuration" is characterized by having a mobile concrete mixer (1) mounted on a vehicle (V) and having a composite bulk solid material storage compartment (2), wherein a cement compartment or cementitious material compartment (3) is longitudinally sandwiched between a fine aggregate compartment and a coarse aggregate compartment (4 & 5), each having an inclined conveyor (6, 7 & 8), wherein the mixer (9) is divided into two sides (A & B) by the longitudinal axis of the vehicle, and the cementitious material or cement is discharged into the mixer at the center along with water, while the fine and coarse materials are discharged into the opposite sides of the mixer (9). Mixing is achieved by a plurality of mixing blades (11), which push the material on the "A side" to the "B side" and vice versa before discharging the fresh concrete through the central discharge gate (14).

Description

Technical Field

[0001] This invention relates to a concrete production and transportation device installed on a heavy transport vehicle.

[0002] In detail, the invention relates to a vehicle-mounted concrete production and transportation equipment having separate dry material compartments for cement, fine aggregate, coarse aggregate and water, and a vehicle-mounted batch mixer for producing fresh concrete. It also has multiple batching systems, multiple drive systems and multiple batch mixers with controllable discharge gates.

[0003] Specifically, this invention relates to an optimized mechanical structure and flow configuration of various materials in a truck-mounted concrete mixer, resulting in a series of new technical and commercial benefits as well as design simplicity, which are not available in the prior art. Background Technology

[0004] In recent years, the ready-mixed concrete (RMC) industry has expanded continuously, with many commercial ready-mixed concrete batching plants now in operation. Current ready-mixed concrete systems consist of stationary batching plants located in specific locations, known as central batching plants, and the wet-mixed concrete produced by these plants is transported over considerable distances by transport mixer trucks equipped with rotating mixing drums. This current wet-mixed concrete transportation system was invented nearly 100 years ago and comes with many inherent problems and limitations. These include air pollution, diesel pollution and waste of diesel fuel, as well as water and material waste.

[0005] To overcome many of these limitations, truck-mounted or vehicle-mounted fully automated equipment that can both produce and transport concrete has been invented.

[0006] The invention disclosed in our authorized Indian Patent No. 287080 is a “weight-based concrete production and transport vehicle” mounted on a vehicle and driven by electric or hydraulic power generated by the vehicle’s power take-off (PTO).

[0007] Our other granted Indian patent, No. 327661, discloses a “highly compact truck-mounted compact batching and mixing station with a novel WCMD device”.

[0008] Another of our granted Indian patents, No. 395657, discloses a truck-mounted concrete mixer with a VWT (Volume, Weight & Time) batching system based on volume, weight, and time.

[0009] These truck-mounted mobile concrete mixers, disclosed in our previously granted patents, are Prior Art No. 1.

[0010] In addition to the aforementioned prior art, there are volumetric concrete mixers with continuous screw mixers in Europe and the United States. For the purposes of this invention, these mixers are not considered relevant prior art because they are equipped with "continuous screw mixers with open discharge ends" and "manual material setting devices for coarse and fine aggregates." These devices cannot guarantee high-quality homogeneous concrete without human intervention and are therefore not accepted in the Indian market. This invention, however, essentially discloses a device that operates without human intervention and has a batch mixer equipped with a controllable discharge gate.

[0011] Technical problems or limitations of existing technologies:

[0012] The prior art disclosed above primarily focuses on drive systems and batching systems used in the production of concrete, particularly in mobile applications. Furthermore, the prior art discloses multiple compartments for various solid materials, such as, but not limited to, cement, fly ash or granulated blast furnace slag powder (GGBS), 10 mm coarse aggregate, 20 mm coarse aggregate, river sand, crushed sand, and additives, as well as various batch mixers.

[0013] As previously described, the existing technologies primarily focus on the drive and batching systems, but not on material flow configuration. It is particularly important to note that, due to the extremely limited available space on trucks, several individual compartments are arranged in a manner deemed convenient by the designers and manufacturers. Furthermore, a larger number of components leads to longer cycle times; and obstacles in conveying all materials to the mixer in specific proportions for concrete production also result in low yields.

[0014] Another significant limitation lies in the concrete discharge height: due to the presence of multiple components, hoppers, chambers, conveyors, mixers, etc., the achievable discharge height is relatively low. However, for mobile concrete mixers to become a viable alternative to traditional transport mixer trucks, the industry requires higher discharge heights. Higher discharge heights ensure easier placement of concrete pumps and provide a height advantage for pouring concrete downwards via chutes.

[0015] Our experience has also shown that each component of a truck-mounted mobile concrete batching plant must be properly configured to complement and reinforce each other during operation, thereby achieving optimal utilization of the available space on the truck and obtaining high productivity, improved mix quality, and high discharge height. All these technical and commercial advantages can be achieved through an improved material flow configuration in which key components of the equipment, such as bulk storage, conveyors, hoppers, and even the mixer, work together to ensure a specific material flow. In addition to making the equipment easier to manufacture and having lower capital costs, this also reduces the weight of the equipment and improves cost-effectiveness.

[0016] To achieve the aforementioned new technological and commercial benefits, this invention discloses a new, highly efficient, and improved material flow system configuration that simplifies design and thus offers numerous new technological and commercial benefits compared to existing technologies, benefits that have not been present in existing technologies to date.

[0017] Purpose of the invention and solution to the problem: What are the technical and business objectives for optimized material storage and material flow configuration? Material flow in mobile concrete mixers is crucial and critical, as it determines not only the ease and smoothness of all material handling but also extremely high productivity and ultra-short batch cycle times. This is particularly important and critical for truck-mounted mobile concrete mixers for the following reasons.

[0018] a. Very limited space on the truck: Unlike stationary premix plants, which are bulky and occupy a lot of space, mobile concrete mixers, installed on motorized trucks or vehicles for production and transportation purposes, have very limited space available for equipment and materials. Therefore, material arrangement becomes critical when utilizing available space to achieve optimal output. The fundamental goal is to have improved material storage, which can help increase hourly concrete production rates.

[0019] b. Loading height and storage volume limits for solid and liquid components.

[0020] There are size restrictions for motor trucks and vehicles because, according to India’s Commercial Vehicles Act, any oversized or oversized vehicle is not allowed on the road.

[0021] The operational challenge lies in the fact that mobile mixers require material hoppers with practical loading heights, as these hoppers are typically loaded using front-end loaders or other available material handling equipment. Furthermore, the required storage volume is limited by the vehicle's own weight, the equipment's net weight, and the truck's permissible gross vehicle weight. Therefore, the goal is to ensure minimal material loading height while optimizing storage capacity.

[0022] c. Solid material conveyors need to have optimal synergy with each other.

[0023] Since the vehicle carries a variety of solid materials, and each material has its own independent compartment, it is important for the material conveyors to work together when transporting the materials.

[0024] d. Extremely short cycle time, thus achieving optimal productivity within the limited available space.

[0025] As mentioned earlier, productivity depends on the cycle time for producing a single batch of concrete, which involves both batching and mixing processes. In our experience, high productivity and structural simplicity are only possible when the materials and their respective conveyors are optimized.

[0026] e. A mixer design that is complementary and mutually reinforcing in terms of material movement and jamming relief.

[0027] Concrete mixers play a crucial role in mixing materials with water to produce high-quality homogeneous concrete in a very short time. Having manufactured various truck-mounted concrete mixers and batching and mixing plants with various mixers, we have recognized that the mixer is the final point of convergence for the material flow and therefore should have a complementary and supplementary design to complement and reinforce the material storage and the flow of materials through their respective conveyors.

[0028] f. Improved material flow resulted in better mixing within a shorter mixing time.

[0029] As described above, the material storage system, each material conveyor, and the mixer should all follow a specific material flow pattern in order to achieve better mixing in a short mixing time.

[0030] g. Due to the improved material flow system, the power requirements are relatively low and the connection load is low.

[0031] Optimized material storage and flow configuration before and inside the mixer is crucial for reducing power requirements and net connection load. This is achieved by maximizing the use of available space and equipping the mixer with a material storage system that complements and supplements the material flow within the mixer.

[0032] h. Extremely high fuel economy is achieved by using a small prime mover due to the improved material flow system.

[0033] As described in section g, extremely high fuel economy can be achieved regardless of the drive system if the net connection load is reduced by optimizing the material flow throughout the machine, before and within the mixer.

[0034] i. An optimized material flow system results in relatively low equipment weight, which in turn leads to higher material transport capacity.

[0035] The complex construction of equipment with multiple material flow obstacles not only leads to longer cycle times but also results in greater equipment weight. This means that less material can be transported for a given GVW (Gross Vehicle Weight). Therefore, optimized material storage and material flow configurations not only simplify construction but also reduce equipment weight, enabling end users to transport more material.

[0036] j. Simple to manufacture and low investment cost: Having equipment that is easy to mass-produce and has low manufacturing costs is very important. Therefore, optimized material storage and material flow configuration is crucial and important for achieving this, and is thus another objective of this invention.

[0037] k. Higher concrete unloading height: When a mobile mixer is used for the production and transportation of concrete, a high concrete discharge height is crucial because it can feed concrete to a pump positioned below the mixer's discharge port and pour concrete downwards via chutes, similar to a conventional concrete mixer truck. This is very important and critical for the practical use of truck-mounted mobile batching plants for production and transportation. Therefore, a high concrete discharge height is a key objective of this invention. Summary of the Invention

[0038] A "mobile concrete mixer with sandwich-type material storage and material flow configuration" is disclosed, which consists of the following parts: a. A mobile concrete mixer (1) mounted on a motor vehicle (V), characterized in that it is a “sandwich-type bulk storage bin for composite solid materials (2)”, which is further adapted to have “three longitudinal compartments extending parallel to the longitudinal axis of the vehicle”, one for cementitious materials, a second for fine aggregates and a third for coarse aggregates, such that a “cementitious material bin (3) is correspondingly longitudinally sandwiched between a fine aggregate bin (4) and a coarse aggregate bin (5), wherein the cementitious material bin (3) is provided with a screw conveyor (6) at the bottom, the screw conveyor being inclined at an angle between 20 and 40 degrees, and the fine aggregate bin (4) and the coarse aggregate bin (5) are respectively provided with baffle belt conveyors (7) and (8) in the same manner of inclination as the cementitious material screw conveyor (6), and all three conveyors (6, 7 & 8) are adapted to convey their respective materials toward the inclined side in the same direction; b. A forced concrete mixer (9) is operatively positioned below the discharge end of a conveyor (6, 7 & 8) and divided into two equal parts, side A and side B, by an extended longitudinal axis of a vehicle (V), wherein cementitious material is thus adapted to enter the mixer (9) along the centerline with water, and fine material conveyor (7) and coarse material conveyor (8) are adapted to discharge fine solid material and coarse solid material respectively on side A and side B, wherein the mixer (9) is adapted to have a plurality of mixing blades inside, which continuously move material entering from side A to side B and material entering from side B to side A at high speed, and the mixer (9) is provided with a controllable discharge gate (14) at the center of the bottom of the mixer, the discharge gate being adapted to discharge the mixed concrete after a preset mixing time has been reached.

[0039] Mobile concrete mixers mounted on vehicles have multiple components. These components include the mixer's drive system, the mixer's operating system, a batching system for dispensing or proportionally mixing concrete components, a material storage system, a material conveying system, and a mixing system.

[0040] However, this invention focuses on the material storage and flow configuration, as well as the mechanical structure of the mobile mixer, and is unrelated to the mixer's drive system, which includes, but is not limited to, drive forces obtained from the power output of a vehicle engine via electric or hydraulic means, a dedicated auxiliary engine, a lithium-ion rechargeable battery, an aluminum-ion battery, etc. Therefore, this invention is not concerned with the drive system used to operate the mixer, but primarily focuses on the physical structure and the material flow configuration of the concrete components before and during mixing. Therefore, the mobile concrete mixer disclosed in this application can be operated by any of the aforementioned drive systems.

[0041] Similarly, the operating system of the mobile concrete mixer consists of a PLC (Programmable Logic Controller) panel that performs the batching and mixing of components without human intervention, based on the required mix design.

[0042] Therefore, this optimized mechanical storage and the batching method are taken into account when programming the control panel. Thus, if the machine is equipped with VWT batching or batching based on volume, weight, and time, or proportional batching, the operating system is accordingly programmed to work in conjunction with the optimized material storage design and material flow configuration disclosed above. Therefore, in the VWT system, all three conveyors (6, 7 & 8) are individually calibrated, and each conveyor operates at a fixed rpm with a fixed flow rate. The operating system is thus programmed to run the conveyors (6, 7 & 8) simultaneously with water, and to individually shut down each conveyor (6, 7 & 8) after a preset material discharge into the mixer (9), and the discharge gate (14) is opened by the system after the mixing time ends.

[0043] However, when a weight-based batching system is provided, the mixer (9) is placed on a weighing sensor, and each material can be added to the mixer (9) one by one by the system in a cumulative manner. Alternatively, in another embodiment, an optional batching hopper (12) can be installed between the working ends of the conveyors (6, 7 & 8), and the hopper (12) is placed on a weighing sensor to weigh all materials from the conveyors (6, 7 & 8), and the hopper (12) has a small belt (13) at its bottom to unload the weighed material into the mixer (9). The basic discrete construction of the material storage and the mixer (9) remains unchanged. In another embodiment, the weighing hopper (12) may alternatively be provided with a discharge gate (13) to unload the weighed material into the mixer (9).

[0044] The mixer (9) is symmetrically located at the rear of the vehicle (v), just below the discharge end of the conveyors (6, 7 & 8). The most preferred embodiment disclosed in this application discloses a simple single-shaft mixer (9) with a centrally located shaft (10) and a semi-circular bottom, wherein the shaft (10) is equipped with agitator blades (11). The mixer is divided into two parts, side A and side B, by the longitudinal axis of the vehicle (V). Cement or cementitious material with water (not shown) is discharged at the center of the mixer, while fine and coarse materials are discharged at sides A and B, respectively. In other words, cement and water are discharged at the center of the mixer, while fine and coarse materials are discharged on opposite sides. The agitator blades (11) on sides A and B are mirror images of each other, and both blades on sides A and B push solid material toward the center when rotating in a single direction. A discharge gate (14) is provided, located at the center of the bottom of the mixer, allowing concrete to be discharged after the mixing time has ended.

[0045] Various embodiments are possible without altering the main mechanical structure disclosed above, and such embodiments in no way limit the scope of the disclosed invention.

[0046] Various embodiments are possible by combining different batching and drive systems with the aforementioned discrete material storage and flow configuration. This does not limit the basic invention disclosed in this application.

[0047] The most preferred embodiment disclosed in this application presents a simple single-shaft mixer with left-handed and right-handed blades specifically designed to assist material flow, thereby producing the desired optimal results in terms of concrete quality and yield. However, in commercial applications, various embodiments are possible by combining various types of mixers with the sandwich-type material storage disclosed above, such as, but not limited to, twin-shaft or multi-shaft mixers with similar mechanical structures, mixers with unidirectional blades or paddles capable of reversible rotation, horizontal mixers (e.g., disc mixers), reversible drum mixers, etc. However, such embodiments are covered by this application and therefore do not limit the scope of the disclosed invention. Attached Figure Description

[0048] 1. On page 1 Figure 1 A top view of the most preferred embodiment of the present invention is disclosed.

[0049] 2. On page 2 Figure 2 A rear view of the most preferred embodiment of the present invention is disclosed.

[0050] 3. On page 3 Figure 3 A side view of the most preferred embodiment of the present invention is disclosed.

[0051] 4. Figure 6 on page 6 discloses a side view of an embodiment of the present invention, which has an optional intermediate weighing or waiting hopper (12).

[0052] Detailed description and working principle of the present invention with reference to the accompanying drawings: Please refer to page 1. Figure 1 The paper discloses a top view of the most preferred embodiment of the present invention.

[0053] As shown in the top view, the mobile concrete mixer (1) is mounted on a vehicle (V). The top view also reveals the unique construction of the composite material storage (2), which has three longitudinal compartments along its length.

[0054] The No. 3 cementitious material or binder bin is longitudinally sandwiched between two aggregate bins, namely the fine material bin (4) and the coarse material bin (5). The fine material used is crushed sand, manufactured sand, or river sand, or a mixture of both. The coarse aggregate can be crushed stone or gravel of various particle sizes. The standard coarse aggregate used is 10 mm or 20 mm in particle size, or a premix of both.

[0055] Concrete is a building material made by mixing a cementitious material such as cement with fine aggregate, coarse aggregate, and water. Chemical additives are added in specific dosages to improve the properties of concrete or to give it desired characteristics. However, since this invention essentially relates to the sandwich storage and flow of solid materials in concrete, for clarity and brevity, only optimized material storage and flow configurations before and during mixing are disclosed.

[0056] As on page 1 Figure 1 As shown above, the vehicle V and the concrete mixer (1) share the same longitudinal axis. Therefore, the cementitious material compartment (3) is longitudinally sandwiched between compartments (4 and 5) for fine aggregate and coarse aggregate, respectively.

[0057] By providing separate conveyors for each material, all three materials move in the same direction (i.e., toward the rear of the vehicle). Therefore, a screw conveyor (6) is located at the bottom of the cement or cementitious material hopper (3), which conveys the cement or cementitious material to the rear of the vehicle. A baffle belt conveyor (7) is used to convey the fine aggregate to the rear of the vehicle and is operationally positioned below the fine material hopper (4). Another baffle belt conveyor (8) is used to convey the coarse aggregate to the rear of the vehicle.

[0058] Please see page 3. Figure 3 The present invention discloses a side view of the most preferred embodiment.

[0059] As shown in the figure, all three conveyors (6, 7 & 8) are tilted at an angle to provide a high unloading height on the vehicle. Therefore, all three basic solid materials required for concrete production can be supplied at a high unloading height and in a small space. Since these materials are unloaded into the mixer (9) under gravity, they can enter the forced mixer (9) in an ideal manner. In addition to this fundamental advantage, a water tank (15) of the required size is also located beneath the tilting conveyors.

[0060] The longitudinal axis of the vehicle divides the mixer (9) into two parts, A and B, as shown in the figure.

[0061] From page 1 Figure 1 It can be clearly seen that cement or basic binder is discharged precisely into the center of the mixer (9), while fine and coarse aggregates are discharged into sides A and B of the mixer (9). In other words, cement is discharged into the center, while fine and coarse materials are discharged into positions opposite each other. Water pipes (not shown) also ensure that water and chemical additives are added to the center of the mixer (9). Now, as on page 1... Figure 1The preferred embodiment shown discloses a single-shaft simple concrete mixer having a single shaft (10) with a gear drive on one side and a bearing on the other. The single shaft (10) is provided with a plurality of mixing blades (11) and rotates in one direction. The mixing blades on side A are positioned exactly opposite to those on side B. In other words, if side A has left-handed blades, side B has right-handed blades, and vice versa. This unidirectional rotation ensures that material moves from side A to side B, while material moves from side B to side A. In other words, the blades on side A and side B ensure that material flows toward the center of the mixer. A discharge gate (14) is provided at the center of the working circular bottom of the mixer (9). Therefore, when the discharge gate (14) is securely closed during mixing, the shaft (10) has high torque and high speed, thereby allowing material to be transferred from side A to side B in a short time due to the gaps between the blades (11), and vice versa. These intentional gaps prevent any jamming. However, the blades (11) cover the entire span of the mixer to achieve 100% discharge. Once the discharge gate (14) is opened, the mixed concrete is discharged through the discharge gate.

[0062] Please refer to page 3. Figure 3 It discloses a rear view of the most preferred embodiment of the present invention, which discloses the direction of material movement inside the mixer.

[0063] This unique material storage configuration brings new technological and commercial advantages that are impossible with existing technologies. The sandwich structure ensures a large storage capacity while keeping the material loading height controllable. Most importantly, all three basic solid materials are unloaded at a higher position on the vehicle, something that no previously cited or known existing technology could achieve. This higher raw material unloading height on the vehicle, in turn, allows the mixer to have a much higher unloading height for fresh concrete, comparable to that of a typical conventional transport mixer truck. This will make the mobile concrete mixer more practical in real-world use, especially as a replacement for current wet concrete transport mixers.

[0064] Another technical and commercial advantage of this invention lies in the higher discharge height ensured by the sandwich-type material storage, as shown in the figure, which makes the device compatible with all batching systems, namely weight-based, volume-based, flow-based, or VWT (Volume, weight, Time)-based batching systems. Furthermore, since all three types of materials have separate conveyors, the amount of material discharged per revolution can be calculated by placing an rpm sensor at the final drive of each conveyor, and batching of materials can also be based on the revolutions method.

[0065] Please refer to page 4. Figure 4 The invention discloses a side view showing an intermediate weighing or waiting hopper (12) arranged between the discharge end of the conveyor (6, 7 & 8) and the mixer (9). Therefore, when used for weight-based batching, the high discharge height of all solid materials makes it possible to use a single weighing hopper or batch waiting hoppers.

[0066] Please refer to page 1. Figure 1 It is clear from this that the synergistic effect in the material flow during batching and mixing results in an extremely short cycle time, and thus an extremely high output rate.

[0067] In addition, the cementitious material silo or cement silo (3) located in the center is equipped with a top cover, which is not shown in the figure for clarity. The cover ensures that aggregates do not enter the cement silo. The cement silo may also be a few inches higher than the aggregate silo to ensure complete separation of fine and coarse materials and a larger cement storage capacity. During transportation, a rain cover is provided for the open top.

[0068] As previously stated, those skilled in the art can make many embodiments without altering the basic invention. For example, the conveyors (7 & 8) are alternatively configured to have adjustable material gates for use with a continuous mixer. Alternatively, the adjustable gates can be used to precisely regulate volumetric flow rates. These advantages are essentially attributable to the higher unloading height integrated on the vehicle due to the unique sandwich construction of all three solid components of concrete. Furthermore, the cementitious material or cement can be pure silicate cement or cement incorporating granulated blast furnace slag powder or fly ash. All possible variations and embodiments are covered by the disclosure of this invention and in no way limit the scope of the disclosed invention.

Claims

1. "A mobile concrete mixer with sandwich-type material storage and material flow configuration", characterized in that, a. A mobile concrete mixer (1) mounted on a motor vehicle (V), characterized in that it has a "sandwich-type bulk storage bin for composite solid materials" (2) having "three longitudinal compartments (4, 3 & 5) extending all parallel to the longitudinal axis of the vehicle", arranged such that "a cementitious material bin or a cement bin (3) is longitudinally sandwiched between a fine aggregate bin (4) and a coarse aggregate bin (5), wherein the cementitious material bin (3) is provided with a screw conveyor (6) at the bottom, the screw conveyor being inclined at an angle between 20 and 40 degrees, and the fine aggregate bin (4) and the coarse aggregate bin (5) are respectively provided with baffle belt conveyors (7) and (8), the baffle belt conveyors being inclined in the same manner as the cementitious material screw conveyor (6), and all three conveyors (6, 7 & 8) are configured to convey their respective materials in the same direction toward the inclined side, thereby causing all solid components of the concrete on the vehicle to reach a higher discharge height; b. A forced concrete mixer (9) is operationally positioned below the discharge end of a conveyor (6, 7 & 8) and divided into two equal parts, side A and side B, by the longitudinal axis of the vehicle (V). The cementitious material is thus configured to enter the mixer (9) at the center along with water. The fine material conveyor (7) and the coarse material conveyor (8) are configured to discharge fine solid material and coarse solid material respectively from side A and side B of the mixer 9. The mixer (9) is configured to have multiple mixing blades inside, which continuously move material entering from side A to side B and material entering from side B to side A at high speed. The mixer (9) has a controllable discharge gate (14) at the center of the bottom of the mixer, which is configured to discharge the mixed concrete after a preset mixing time has been reached.

2. The mobile concrete mixer with sandwiched material storage and material flow configuration of claim 1, wherein, A composite solid material storage (2) is provided, wherein a cement hopper or cementitious material hopper (3) is longitudinally sandwiched between a fine aggregate hopper and a coarse aggregate hopper (4 and 5, respectively).

3. The mobile concrete mixer with sandwiched material storage and material flow configuration of claim 1, wherein, A mobile concrete mixer (1) is provided with a composite bulk solid material storage (2), wherein a cement bin or cementitious material bin (3) is longitudinally sandwiched between a fine aggregate bin and a coarse aggregate bin (4 & 5), and the central bin (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, while the fine aggregate bin and the coarse aggregate bin are configured to have baffle belt conveyors (7 & 8), which are arranged such that all conveyors are inclined and configured to convey materials parallel to the inclined end, and a batch waiting hopper (12) is configured to receive materials from the working discharge end of the conveyors.

4. The mobile concrete mixer with sandwich material storage and material flow configuration of claim 1, wherein, A mobile concrete mixer (1) is provided with a composite bulk solid material storage (2), wherein a cement hopper or cementitious material hopper (3) is longitudinally sandwiched between a fine aggregate hopper and a coarse aggregate hopper (4 & 5), and a central hopper (3) containing cementitious material is configured to have a screw conveyor (6) at the bottom. The fine aggregate hopper and the coarse aggregate hopper are configured to have baffle belt conveyors (7 & 8), and a hopper (12) is installed between the discharge end of the conveyors (6, 7 & 8) and the mixer (9). The hopper (12) is provided with a weighing sensor for cumulative weighing of all three solid materials such as cementitious material (3), fine aggregate (4) and coarse aggregate (5), and a discharge device (13) for discharging the weighed material into the mixer (9).

5. The mobile concrete mixer with sandwich material storage and material flow configuration of claim 1, wherein, A mobile concrete mixer (1) is provided with a composite bulk solid material storage (2) and mounted on a vehicle (v), wherein a cement hopper or cementitious material hopper (3) is longitudinally sandwiched between a fine aggregate hopper and a coarse aggregate hopper (4 & 5), wherein a central hopper (3) containing cementitious material is configured to have a screw conveyor (6) at its bottom, while the fine aggregate hopper and the coarse aggregate hopper are configured to have baffle belt conveyors (7 & 8), arranged such that all three conveyors are inclined and configured to convey material parallel to each other toward the inclined ends, and a weighing hopper (12) with a weighing sensor is installed between the discharge end of the conveyors (6, 7 & 8) and the mixer (9), wherein the hopper (12) is configured to have a belt conveyor (13) at its bottom.

6. The mobile concrete mixer with sandwich material storage and material flow configuration of claim 1, wherein, The system includes a composite bulk solid material storage (2), wherein a cement bin or cementitious material bin (3) is longitudinally sandwiched between a fine aggregate bin and a coarse aggregate bin (4 & 5), and the central bin (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, while the fine aggregate bin and the coarse aggregate bin (4 & 5) are configured to have baffle belt conveyors (7 & 8), arranged such that all conveyors (6, 7, & 8) are inclined and configured to convey material parallel to the inclined end, and a batching hopper (12) is configured to receive material from the working discharge end of the conveyor, wherein the batching hopper (12) is configured to have a discharge device (13) at its bottom for discharging material into the mixer (9).

7. The mobile concrete mixer with sandwiched material storage and material flow configuration of claim 1, wherein, A mobile concrete mixer (1) is provided with a composite bulk solid material storage (2), wherein a cement hopper or cementitious material hopper (3) is longitudinally sandwiched between a fine aggregate hopper and a coarse aggregate hopper (4 & 5), wherein the central hopper (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, while the fine aggregate hopper and the coarse aggregate hopper are configured to have baffle belt conveyors (7 & 8), the arrangement of which is such that all conveyors are inclined and configured to convey materials parallel to the inclined end, and when the three solid materials are batched by a combined volume, weight and time batching system, all materials are directly unloaded into the mixer (9).

8. The "mobile concrete mixer with sandwich-type material storage and material flow configuration" as described in claim 1, characterized in that, A mobile concrete mixer (1) is provided, mounted on a vehicle (v) and having a compound bulk solid material storage (2), wherein a cement hopper or cementitious material hopper (3) is longitudinally sandwiched between a fine aggregate hopper and a coarse aggregate hopper (4 & 5), wherein the central hopper (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, while the fine aggregate hopper and the coarse aggregate hopper (4 & 5) are configured to have baffle belt conveyors (7 & 8), arranged such that all conveyors are inclined and configured to convey materials parallel to the inclined end, and when the three solid materials are batched based on the material discharged from each rotation of the final drive of each conveyor (6, 7 & 6), all materials are directly discharged into the mixer (9).

9. The "mobile concrete mixer with sandwich-type material storage and material flow configuration" as described in claim 1, characterized in that, A mobile concrete mixer (1) is provided, mounted on a vehicle (V) and having a composite bulk solid material storage compartment (2), wherein a cement compartment or cementitious material compartment (3) is longitudinally sandwiched between a fine aggregate compartment and a coarse aggregate compartment (4 & 5), wherein the central compartment (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, while the fine aggregate compartment and the coarse aggregate compartment (4 & 5) are configured to have baffle belt conveyors (7 & 8), arranged such that all conveyors are inclined and configured to convey material parallel to the inclined end, and when the forced mixer (9) is equipped with a weighing sensor and is itself used as a weighing scale, all material is instead directly unloaded into the mixer (9).

10. The "mobile concrete mixer with sandwich-type material storage and material flow configuration" as described in claim 1, characterized in that, A mobile concrete mixer (1) is mounted on a vehicle (V) and has a composite bulk solid material storage compartment (2), wherein a cement compartment or cementitious material compartment (3) is longitudinally sandwiched between a fine aggregate compartment and a coarse aggregate compartment (4&5), wherein the central compartment (3) containing the cementitious material is configured to have a screw conveyor (6) at the bottom, and the fine aggregate compartment and the coarse aggregate compartment (4&5) are configured to have baffle belt conveyors (7&8), which are arranged such that all conveyors (6,7&8) are inclined and configured to convey material parallel to the rear of the vehicle and unload the material into the mixer (9), wherein the type of mixer is not limited to a single-shaft mixer, but can be any mixer, such as, but not limited to, a twin-shaft or multi-shaft mixer, a reversible mixer, a disc mixer and a screw mixer, etc.

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