Multi-stage pretreatment metering batching equipment for concrete mixing

Abstract

The invention discloses concrete mixing multi-stage pretreatment metering batching equipment, and relates to the related technical field of concrete production, and the concrete mixing multi-stage pretreatment metering batching equipment comprises a rack; the batching system is fixed at the upper part of the rack and comprises at least two batching bins arranged in parallel and a metering bin arranged below the batching bins; the dynamic discharging mechanism comprises a swing type discharging baffle hinged to a discharging port below the measuring bin, a hydraulic telescopic rod driving the discharging baffle to swing in a reciprocating mode to be opened and closed, and a material shifting plate. The conveying system is arranged below the measuring bin and comprises a belt conveyor and a three-section type movable roller set for supporting a belt, and the movable roller set comprises a middle lifting movable wheel and deflection movable rollers on the two sides. According to the invention, through combination of the innovative dynamic blanking mechanism and the deformable conveying system, various materials are pretreated and preliminarily mixed in the metering, batching, blanking and conveying processes, and the initial distribution state of the materials before the materials enter a stirrer is effectively improved, so that the subsequent stirring efficiency and the stirring quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete production, in particular to a multi-stage pretreatment metering and batching equipment for concrete mixing. BACKGROUND

[0002] In the process of concrete production, accurate batching and uniform mixing are the key to ensuring the quality of concrete. The traditional concrete batching equipment usually includes several batching bins, each of which is provided below with a metering scale. The metered material is directly unloaded to the lower conveying belt machine through the discharge gate, and then conveyed to the mixing host for centralized mixing by the belt machine.

[0003] The existing concrete batching machine, such as CN105459269A, comprises a rack, a storage hopper, a belt conveyor, a weighing hopper, a weighing belt conveyor and an electric control box. The storage hopper is fixed on the rack, the belt conveyor is arranged at the lower end of the storage hopper, the weighing hopper is arranged below the end of the belt conveyor away from the storage hopper, and the weighing belt conveyor is arranged at the lower end of the weighing hopper, which can meet the demand of different types of batching.

[0004] However, this traditional method has some inherent defects: first, different types of materials, such as aggregate, sand, cement, etc., are stacked on the conveying belt in sequence or independently, and the materials are in a clear layered or separated state on the belt, with poor initial distribution uniformity. This makes the subsequent mixer need to consume more energy and take longer time to mix them uniformly, which not only is low in efficiency, but also may affect the final quality of the concrete due to insufficient mixing. Secondly, the traditional discharge gate is mostly a simple gate type or single-side opening type, and the discharge speed control is not accurate, and the "arch effect" of the material in the bin is easy to cause blockage, and the discharge is not smooth. In addition, the traditional flat belt or fixed trough belt cannot perform any pretreatment on the materials during the conveying process, and the function is single.

[0005] Therefore, an equipment capable of pretreating and preliminarily mixing the materials during the batching and conveying stage is needed to reduce the load of the mixing host and improve the mixing efficiency and quality. In view of this, in-depth research is conducted on the above problems, and the present application is produced. SUMMARY

[0006] The present application aims to provide a multi-stage pretreatment metering and batching equipment for concrete mixing to solve the problems of poor initial distribution uniformity of materials, unstable discharge supply, no pretreatment, single function, and affecting the subsequent mixing efficiency and mixing quality in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-stage pretreatment metering and batching equipment for concrete mixing, comprising a rack, a batching system, a dynamic discharge mechanism and a conveying system.

[0008] The batching system is fixed on the upper part of the frame and comprises at least two batching bins arranged in parallel and a metering bin arranged below the batching bins.

[0009] The dynamic discharge mechanism comprises a swinging discharge baffle hinged to the rectangular discharge opening below the metering bin, a hydraulic telescopic rod that drives the baffle's reciprocating swing, enabling intermittent opening and closing, and a paddle fixed to the baffle's rotating shaft and located within the bin. This design allows the baffle to swing back and forth like a pendulum, rather than simply opening or closing. The paddle also stirs the material within the bin, providing arch breaking, material flow guidance, and initial mixing.

[0010] The conveying system, located below the metering bin, comprises a belt conveyor and a three-section roller assembly supporting the belt. The roller assembly comprises a vertically elevating central elevating roller and two tiltable, lateral deflecting rollers. By adjusting the positions of these three rollers in a coordinated manner, the cross-sectional shape of the belt can be actively controlled: when the elevating roller descends and the deflecting rollers on either side tilt inward, the belt's center concavely forms a "U" shape, which helps gather material during conveying. When the elevating roller ascends and the deflecting rollers on either side expand outward, the belt's center rises and its sides descend, forming a "W" shape. This allows the material to be spread outward during unloading, accommodating the incoming material.

[0011] Preferably, an expandable feed hopper is provided on the top of the batching bin, the opening width of the expandable feed hopper is greater than the width of the batching bin body, and material guiding slopes of 30°-45° are provided on both sides thereof.

[0012] The expanded hopper design, employing this technical solution, not only increases the feed opening area and improves loading efficiency, but also features a ramped guide surface that effectively guides material into the batching bin, reducing material jamming and spillage during the feeding process, further ensuring accurate and stable batching. Furthermore, the expanded hopper's opening width and the angle of the ramped guide surface ensure even material distribution within the batching bin, providing an excellent foundation for subsequent metering and pre-processing, facilitating forklift loading, and preventing spillage.

[0013] Preferably, the bottoms of the batching bin and the metering bin are both rectangular material openings, and a primary blanking plate is provided between the metering bin and the batching bin, and the primary blanking plate is a one-way opening and closing structure.

[0014] Using the above technical solution, the primary unloading plate is used to control the material from the batching bin into the metering bin. The primary unloading plate can enable the material falling from the batching bin to enter the metering bin in an orderly and controllable manner. The one-way opening and closing structure ensures the stability of the material during the metering process, improves the accuracy of the batching, and facilitates stable weighing and metering with the metering bin.

[0015] Preferably, the blanking plate swings through a range of angles by a hydraulic telescopic rod, and the front and rear sides of the metering bin are alternately provided with the hydraulic telescopic rods, and the front and rear sides of the blanking plate correspond to the upper and lower sides when the front and rear sides of the blanking plate are in the "W" shape with the belt.

[0016] With the above technical solution, when the blanking plate swings back and forth through the hydraulic telescopic rod, the speed and amount of blanking can be adjusted according to actual production needs, achieving more precise control. At the same time, since the front and rear sides of the blanking plate correspond to the upper and lower sides when the front and rear sides of the blanking plate are in the "W" shape with the belt, this design ensures that the material can be evenly distributed when falling onto the belt, avoiding the problem of layered or separated state of the material on the belt in the traditional way.

[0017] Preferably, the end of the piston rod of the hydraulic telescopic rod is provided with an angle sensor for real-time feedback of the opening and closing state of the blanking plate.

[0018] With the above technical solution, the hydraulic telescopic rod and the angle sensor cooperate to accurately control and feedback the opening and closing angle of the blanking plate. The angle sensor can accurately perceive the swing angle of the blanking plate, thereby achieving accurate monitoring of the blanking process. Through cooperation with the control module, automatic adjustment of the swing range of the blanking plate can be achieved, ensuring the stability of the blanking speed and amount, and further improving the accuracy of batching.

[0019] Preferably, the stirring plates are uniformly distributed along the shafts, and the shafts are transversely through the inside of the metering bin, wherein the stirring plates, the shafts and the blanking plate form a synchronous swing structure.

[0020] With the above technical solution, the blanking plate, the shafts and the stirring plates form a whole that swings synchronously inside and outside the bin, without the need for additional driving, based on the improvement of the blanking plate of the traditional equipment. After improvement, the stirring plates swing synchronously with the blanking plate, which not only can stir and mix the material during the blanking process, but also can further break the arch and dredge the material, ensuring smooth falling of the material. The design of the synchronous swing structure makes the dynamic blanking mechanism more comprehensive and efficient in function, which can not only achieve precise control of the blanking speed and amount of the material, but also can pretreat and preliminarily mix the material during the batching stage, providing good conditions for the subsequent mixing process.

[0021] Preferably, the deflection movable rollers are symmetrically arranged on the left and right sides of the lifting movable wheels, and the deflection movable rollers are movably connected to the frame, and the deflection angle range is ±15°.

[0022] With the above technical solution, the symmetric arrangement of the deflection movable rollers and the certain deflection angle range enable the belt to flexibly switch between the "U" shape and the "W" shape, adapting to different blanking needs.

[0023] Preferably, the lifting movable wheel is lifted by a hydraulic cylinder, and the lifting movable wheel and the deflecting movable roller are synchronously connected through a connecting rod mechanism.

[0024] By the above technical solution, the two are adjusted in linkage to ensure the coordination of the shape transformation. When the material needs to be gathered for conveying, the lifting movable wheel is lowered, the deflecting movable roller is inclined inward, and the belt forms a "U" shape; when the material needs to be spread for receiving, the lifting movable wheel is raised, the deflecting movable roller is unfolded outward, and the belt forms a "W" shape.

[0025] Preferably, the width of the belt is 800-1200mm, and limit edges are arranged on both sides of the belt.

[0026] By the above technical solution, the width of the belt is designed to provide sufficient spreading area to ensure sufficient material conveying capacity, and the arrangement of the limit edges can prevent the material from scattering due to deformation and other factors during the shape transformation conveying process, thereby ensuring the stability and accuracy of the material conveying.

[0027] Preferably, the dynamic discharging mechanism and the conveying system further comprise a control module in cooperative connection, and the control module is configured to: adjust the current cross-sectional shape of the belt based on the swing discharging mode of the discharging baffle, so that the discharging position matches the distribution area of the material on the belt; the shape of the belt in the discharging area of the metering bin tends to be "W" type, and the discharging baffle performs alternating swing or large-scale complete opening; the shape of the belt outside the discharging area of the metering bin tends to be alternately switched between "W" type and "U" type.

[0028] By the above technical solution, when the belt is in the "W" type below the discharging port, the discharging baffle is controlled to swing alternately or open widely to discharge the material to the two sides of the "W" type belt or between the two sides of the material when the two sides have the previous material; in the conveying section, the shape of the belt is alternately transformed between the "W" type spreading and the "U" type gathering, and the spreading-gathering movement of the material is utilized to realize preliminary mixing.

[0029] Compared with the prior art, the beneficial effects of the present application are as follows: The concrete mixing multi-stage pretreatment metering and batching equipment combines the innovative dynamic discharging mechanism and the deformable conveying system to pretreat and preliminarily mix the materials during the metering, batching and discharging conveying processes, effectively improves the initial distribution state of the materials before entering the mixer, and thereby improves the subsequent mixing efficiency and mixing quality. Multi-stage pretreatment, mixed starting early: by introducing active mixing action in the metering and belt conveying two links, the material has passed two stages of pretreatment before entering the mixer, the initial uniformity is greatly improved, the load of the mixing host is significantly reduced, and the mixing time is shortened.

[0030] Smooth discharging, precise control: swing type discharging cooperates with internal raking plate, which cooperates with the pair of ingredient bins to preliminarily mix the materials, which is helpful for premixing and effectively destroys the arching effect of the materials, so as to ensure the smoothness of discharging. The swing frequency and opening degree of the discharging baffle can be accurately controlled through the hydraulic system and the angle sensor, so as to realize accurate control of the discharging speed and flow.

[0031] Multi-function in one machine, high integration: various functions such as metering, discharging control, arch breaking and preliminary mixing are highly integrated in one set of equipment, so that the space and cost are saved, and the overall efficiency of the equipment is improved.

[0032] Intelligent collaborative control: the control module automatically adjusts the belt shape according to the discharging mode, so that the discharging and conveying links are closely matched, and the intelligentization and optimization of the whole feeding process are realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a whole structure schematic view of the second embodiment of the present application; Figure 2 It is a belt conveyor structure schematic view of the second embodiment of the present application; Figure 3 It is a reciprocating opening and closing structure schematic view of the discharging baffle of the second embodiment of the present application; Figure 4 It is a metering bin internal structure schematic view of the present application; Figure 5 It is a support belt in a "U" type state structure schematic view of the present application; Figure 6 It is a support belt in a "W" type state structure schematic view of the present application; Figure 7 It is a connecting rod mechanism structure schematic view of the present application; Figure 8 It is a whole structure schematic view of the first embodiment of the present application; Figure 9 It is a metering bin and belt conveyor cooperation structure schematic view of the first embodiment of the present application; Figure 10 It is a connecting rod mechanism structure schematic view of the present application; Figure 9 It is an enlarged structure schematic view of A in the present application.

[0034] In the figure: 1, rack; 2, batching bin; 2a, first batching bin; 2b, second batching bin; 2c, third batching bin; 2d, fourth batching bin; 2e, fifth batching bin; 2f, sixth batching bin; 2g, seventh batching bin; 21, feeding hopper; 22, primary discharge plate; 211, guide slope; 3, metering bin; 3a, first metering bin; 3b, second metering bin; 3c, third metering bin; 3d, fourth metering bin; 3e, fifth metering bin; 3f, sixth metering bin; 31, discharge port; 4, discharge baffle; 41, rotating shaft; 5, hydraulic telescopic rod; 51, angle sensor; 6, poking plate; 7, belt conveyor; 71, supporting belt; 711, baffle; 72, lifting movable wheel; 73, deflecting movable roller; 74, hydraulic oil cylinder; 75, connecting rod mechanism. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] Please refer to Figures 1-10 , the present application provides a technical solution: as Figure 1 shown, the concrete mixing multi-stage pretreatment metering and batching equipment of the present application mainly consists of a rack 1, a batching system, a dynamic discharging mechanism and a conveying system.

[0037] The rack 1 is the support structure of the entire equipment. The batching system is installed on the upper part of the rack 1 and includes batching bins 2 arranged in pairs side by side, which are used to store different materials such as stones, sand and cement. Each batching bin 2 is provided at the top with an expanded feeding hopper 21 and a guide slope 211 for facilitating feeding. The batching bin 2 is connected below through a primary discharge plate 22 with a metering bin 3, and the material is weighed through the metering bin 3.

[0038] As Figure 3 and Figure 4As shown, the dynamic unloading mechanism is located at the bottom of each metering bin 3. A rectangular unloading port 31 is provided at the bottom of the metering bin 3. The unloading baffle 4 is hinged at the unloading port 31 via a rotating shaft 41. The rotating shaft 41 passes through the metering bin 3 transversely, and a plurality of stripper plates 6 are fixedly installed on the part located inside the metering bin 3. A hydraulic telescopic rod 5 is installed on the outside of the front and rear sides of the metering bin 3, and the end of the piston rod is hinged to the swing arm of the unloading baffle 4. By controlling the alternating extension and contraction of the two hydraulic telescopic rods 5, the unloading baffle 4 can be driven to swing back and forth around the rotating shaft 41, so that the unloading port 31 can be opened and closed alternately or synchronously on both sides. The angle sensor 51 at the end of the piston rod monitors the opening and closing angle of the unloading baffle 4 in real time. When the unloading baffle 4 swings, the internal stripper plate 6 swings synchronously with it, continuously moving the material in the metering bin 3, playing the role of breaking the arch and performing preliminary mixing.

[0039] like Figure 9 As shown, the conveying system is located below all metering bins 3 and mainly includes a belt conveyor 7 with a width of 1000mm. The unique feature of this belt conveyor is that the support roller group below it consists of three sections of movable rollers: a central lifting movable wheel 72 and two side deflection movable rollers 73. The lifting movable wheel 72 is connected to a hydraulic cylinder 74 and can be lifted or lowered. The deflection movable rollers 73 on both sides are linked to the lifting movable wheel 72 through a set of linkage mechanisms 75 ( Figure 7 When the hydraulic cylinder 74 and the lifting movable wheel 72 descend, the crossbar of the link mechanism 75 moves downward and the movable blocks on both sides move outward, and the deflection movable rollers 73 on both sides are driven to tilt inward through the link mechanism 75, so that the support belt 71 forms a "U"-shaped groove ( Figure 5 ), used to gather and lift materials during the conveying process. When the hydraulic cylinder 74 lifts the lifting movable wheel 72, the hydraulic cylinder 74 drives the crossbar of the connecting rod mechanism 75 to move upward after a certain lifting stroke, and the connecting rod mechanism 75 drives the deflection movable rollers 73 on both sides to expand outward, so that the support belt 71 convex in the middle and lowered on both sides, forming a "W"-shaped cross section ( Figure 6 ), used to receive the material at the unloading station and spread it to both sides. The support belt 71 is provided with limitable retaining edges 711 on both sides to prevent deviation during the shape transformation process.

[0040] The working process and control logic of the equipment are as follows: Measuring stage: the material is put into the metering bin 3 from the batching bin 2 through the primary unloading plate 22 for weighing.

[0041] Coordinated unloading and pre-processing phase: When material needs to be unloaded onto support belt 71, the control system first activates the conveyor system's hydraulic cylinder 74, adjusting the belt section below unloading port 31 into a "W" shape. The dynamic unloading mechanism's hydraulic telescopic rod 5 is then activated, working in conjunction with the angle sensor 51 to drive the unloading baffle 4 to swing back and forth at a constant frequency and amplitude. The material is spread alternately and layered on both sides of the "W"-shaped support belt 71. For example, material from one bin may land primarily on the left side, while material from the other bin may land primarily on the right side, but this is already staggered during the unloading process. Simultaneously, the unloading plate 6 continuously swings to prevent clogging and agitate the material within the bin.

[0042] Conveying and mixing stage: Once the material is on the belt, the control system controls the movable roller assembly, causing the support belt 71 to periodically switch between a "W"-shaped spreading and a "U"-shaped gathering. This continuous spreading and gathering process repeatedly turns, interweaves, and overlaps the materials initially distributed on both sides of the belt from different batching bins 2, achieving efficient initial mixing.

[0043] The pre-treated and mixed materials are finally transported to the mixer to complete efficient and high-quality mixing.

[0044] The following embodiments are provided for reference regarding the specific configuration of the batching bin 2: Example 1: Three-tank configuration (two premix and one conventional) like Figures 8-10 As shown, this embodiment adopts an optimized three-bin configuration, which is particularly suitable for the scenario where two materials are premixed and then combined with a third auxiliary material or main material.

[0045] The equipment includes a frame 1, with three parallel batching bins 2 arranged above it: the first batching bin 2a, the second batching bin 2b, and the third batching bin 2c. The first batching bin 2a and the second batching bin 2b are grouped together, with the first metering bin 3a corresponding to each bin directly below them. The third batching bin 2c is independently located, with the second metering bin 3b corresponding to each bin directly below it.

[0046] The dynamic unloading mechanism is configured accordingly: the unloading port 31 of the first metering bin 3a is equipped with a reciprocating unloading baffle 4 driven by a hydraulic telescopic rod 5 and a built-in unloading plate 6. The unloading port 31 of the second metering bin 3b can be equipped with a traditional single-opening pneumatic gate or a unloading structure similar to the primary unloading plate 22, depending on the needs.

[0047] The conveying system is located below all metering bins 3. The width of its supporting belt 71 is 1000mm. It is supported by a lifting movable wheel 72 in the middle of a three-section movable roller group and deflection movable rollers 73 on both sides. The cross-sectional shape can be flexibly changed under the command of the control module.

[0048] Its workflow and collaborative control are as follows: First stage pre-treatment and batching (pre-mix batching): When the device is running, it first passes under the first batching bin 2a and the second batching bin 2b. The control module instructs the support belt 71 in this section to change to a pronounced "W" shape, as shown in Figure 6 . At the same time, the reciprocating swing type batching damper 4 of the first metering bin 3a is controlled to swing back and forth. Two different pre-mixed metering materials such as sand and gravel are respectively and layered spread on the left and right recesses of the "W" shaped support belt 71. In this process, the raking plate 6 is continuously working to ensure smooth batching and complete the initial mixing in the bin.

[0049] Second stage batching (regular batching): Subsequently, the belt carries the material that has been distributed on both sides to pass under the third batching bin 2c. The control module instructs the support belt 71 in this section to change to a slight "W" shape or remain flat. If the second metering bin 3b is a traditional gate, the gate is opened to directly batch the third material such as cement or fly ash to the middle area of the support belt 71, unloading between the previously laid two layers of material.

[0050] Conveying and second stage pre-treatment (mixing): After all the materials are batched, in the subsequent conveying section, the control module controls the movable roller group to periodically change the support belt 71 between the "W" shape spreading the mixed material to both sides and the "U" shape gathering the spread material to the middle. This continuous spreading-gathering process repeatedly shears, inserts and superimposes the three materials originally distributed in different areas of the belt, achieving efficient second stage pre-treatment mixing, and then conveying to the mixing main machine.

[0051] Advantages of this embodiment: flexible configuration, good balance between investment cost and functional demand. It not only realizes accurate spreading and pre-treatment of two materials using the patented technology, but also provides a simple solution for the addition of the third material, especially suitable for the production process of sand, gravel and cement in mainstream concrete.

[0052] Implementation II: Four-bin double-group configuration (flexible batching) As shown in Figures 1-3 , this embodiment shows the application of the invention in higher automation and flexibility. The device is provided with four batching bins 2 (labeled as the fourth batching bin 2d, the fifth batching bin 2e, the sixth batching bin 2f, and the seventh batching bin 2g), divided into front and rear groups. Each group of metering bins 3 is equipped with a complete reciprocating swing type batching damper 4 driven by a hydraulic telescopic rod 5 and an internal raking plate 6.

[0053] The conveying support belt 71 and its movable roller group structure are the same as in embodiment I. The core is that the software strategy of the control module can be flexibly configured.

[0054] Its working process is as follows: The control module can intelligently select the discharging mode according to the production formula.

[0055] Mode A (double-group premixing): when the formula requires the materials in the first two bins to be premixed with the materials in the last two bins, the control module instructs the belt to be in a "W" shape when passing under the previous group of metering bins 3 (third metering bin 3c, fourth metering bin 3d), and the two-bin discharging baffles 4 alternately discharge to the two sides of the belt; when passing under the latter group of metering bins 3 (fifth metering bin 3e, sixth metering bin 3f), the belt still maintains a "W" shape, and the two groups of discharging baffles 4 also alternately act to superimpose the latter two materials on the former two materials. Subsequently, a "W-U" shape transformation is performed in the conveying section to premix the four materials as a whole.

[0056] Mode B (centralized discharging): if the formula requires rapid discharging, the control module can instruct all the discharging baffles 4 to be opened simultaneously at a large opening degree, and at the same time the belt is changed to a deep "U" shape in the corresponding section to receive the materials at the maximum capacity, focusing on conveying efficiency rather than premixing.

[0057] Mode C (one-side discharging): if maintenance or process requirements exist, any one of the discharging baffles 4 can be controlled to swing to discharge to the left side or the right side only, and the other bins are closed, with extremely high flexibility.

[0058] Advantages of the embodiment: powerful and highly adaptable. Through software configuration, extremely complex production formulas and process requirements can be met, realizing digital and intelligent management of the discharging and mixing processes, and representing the development direction of high-end concrete batching equipment.

[0059] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-stage pretreatment metering and batching equipment for concrete mixing, characterized in that: include: Rack (1); A batching system is fixed to the upper portion of the frame (1), comprising at least two batching bins (2) arranged in parallel and a metering bin (3) arranged below the batching bins (2); A dynamic unloading mechanism comprises a swing-type unloading baffle (4) hinged to the unloading opening (31) below the metering bin (3), a hydraulic telescopic rod (5) for driving the unloading baffle (4) to swing back and forth, and a prying plate (6) fixed to the unloading baffle rotating shaft (41) and located inside the metering bin (3); The conveying system is arranged below the metering bin (3), and comprises a belt conveyor (7), a three-section movable roller group of a support belt (71), wherein the movable roller group comprises a central lifting movable wheel (72) and two side deflection movable rollers (73), and the lifting movable wheel (72) and the deflection movable rollers (73) are adjusted in a linked manner so that the support belt (71) forms a "U"-shaped gathering or a "W"-shaped spreading shape.

2. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: An expansion type feeding hopper (21) is provided on the top of the batching bin (2). The opening width of the expansion type feeding hopper (21) is greater than the width of the batching bin (2) body, and 30°-45° material guiding slopes (211) are provided on both sides thereof.

3. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The bottoms of the batching bin (2) and the metering bin (3) are both rectangular material openings, and a primary blanking plate (22) is provided between the metering bin (3) and the batching bin (2). The primary blanking plate (22) is a one-way opening and closing structure.

4. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The swing amplitude of the unloading baffle (4) is adjusted by a hydraulic telescopic rod (5), and the hydraulic telescopic rods (5) are alternately installed on the front and rear sides of adjacent metering bins (3). The front and rear opening and closing positions of the unloading baffle (4) correspond to the front and rear sides when the support belt (71) is in a "W" shape.

5. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 4, characterized in that: An angle sensor (51) is provided at the piston rod end of the hydraulic telescopic rod (5) for real-time feedback of the opening and closing state of the blanking baffle (4).

6. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The material-diverting plates (6) are evenly distributed laterally along the rotating shaft (41), and the rotating shaft (41) as a whole laterally penetrates the interior of the metering bin (3), wherein the material-diverting plates (6), the rotating shaft (41) and the material-discharging baffle (4) as a whole form a synchronous swinging structure.

7. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The deflection movable rollers (73) are symmetrically arranged on the left and right sides of the lifting movable wheel (72), and the deflection movable rollers (73) are movably hinged to the frame (1), and the deflection angle range is ±15°.

8. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The lifting movable wheel (72) is lifted by a hydraulic oil cylinder (74), and the lifting movable wheel (72) and the deflection movable roller (73) are synchronously linked through a link mechanism (75).

9. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The support belt (71) has a width of 800-1200 mm, and is provided with limiting ribs (711) on both sides.

10. The multi-stage pretreatment metering and batching equipment for concrete mixing according to claim 1, characterized in that: The dynamic unloading mechanism and the conveying system also include a control module for cooperation, and the control module is configured as follows: Adjusting the current cross-sectional shape of the support belt (71) based on the swinging unloading mode of the unloading baffle (4) so ​​that the unloading position matches the distribution area of ​​the material on the belt; The support belt (71) is shaped like a "W" in the unloading area of ​​the metering bin (3), and the unloading baffle (4) performs alternating swinging or fully opening in a large range; The shape of the support belt (71) outside the unloading area of ​​the metering bin (3) tends to switch alternately between a "W" shape and a "U" shape.

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