Cement batching plant for roads and bridges

Abstract

The application provides a cement batching device for roads and bridges, and relates to the technical field of building construction. The cement batching device comprises a rack, a double-spiral feeding and stirring unit, a first screw conveying cylinder fixedly connected to the rack, a second screw conveying cylinder fixedly connected to the top end of the rack, a screw conveying main shaft rotatably connected to the inside of the first screw conveying cylinder and the second screw conveying cylinder, and feeding screw blades fixedly connected to the outside of the screw conveying main shaft. The closed conveying design fundamentally eliminates the dust emission of cement powder during the transfer process, reduces the dust concentration at the construction site, meets the environmental protection standards of green construction of road and bridge projects, avoids the contact between the material and the humid air, prevents the cement from being damp and caked and the external additive from being damp and invalid, and guarantees the original activity and quality stability of the cementing material.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a cement batching device for roads and bridges. Background Technology

[0002] In road and bridge engineering, the batching accuracy and mixing homogeneity of cement mixtures directly determine the load-bearing capacity and durability of the engineering structure. The construction scenarios place stringent requirements on the continuous operation capability, environmental protection and adaptability of the batching equipment. It is necessary to meet the high-efficiency batching needs of large-scale construction, control dust pollution to meet green construction standards, and avoid concrete quality defects caused by cement clumping, material segregation and other problems.

[0003] Currently, most existing cement batching equipment adopts an open or semi-closed conveying structure, which causes dust to leak out during the conveying of powdery materials, polluting the construction site; and the materials are prone to moisture absorption and clumping when in direct contact with air, leading to material blockage during conveying.

[0004] Therefore, a cement batching device for roads and bridges is proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cement batching device for roads and bridges.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cement batching device for roads and bridges, comprising a frame and a double-helix feeding and mixing unit, wherein the double-helix feeding and mixing unit comprises a primary helical conveying cylinder fixedly connected to the frame, a secondary helical conveying cylinder fixedly connected to the top of the frame, a helical conveying main shaft rotatably connected inside both the primary and secondary helical conveying cylinders, and feeding helical blades fixedly connected to the outer side of the helical conveying main shaft;

[0007] The storage metering and conveying unit includes a No. 1 storage metering tank fixedly connected to the top of the secondary spiral conveying cylinder, and a No. 2 storage metering tank fixedly connected to the top of the secondary spiral conveying cylinder on the side away from the No. 1 storage metering tank.

[0008] A dual-shaft high-power mixing unit, comprising a mixing host cylinder fixedly connected to the outside of a frame, wherein a drive end mounting bracket is fixedly connected to the outside of the mixing host cylinder.

[0009] Preferably, a primary conveying drive motor is fixedly connected to both ends of the outer side of the frame, and the drive end of the primary conveying drive motor is fixedly connected to the screw conveyor main shaft.

[0010] Preferably, both the No. 1 and No. 2 storage metering tanks are fixedly connected to a negative pressure conveying main pipe at their top ends.

[0011] Preferably, the bottom end of the secondary spiral conveyor cylinder is fixedly connected to a transition connecting cylinder, and the outer bottom end of the primary spiral conveyor cylinder is fixedly connected to a metering discharge cylinder.

[0012] Preferably, the bottom end of the transition connecting cylinder is fixedly connected to the primary screw conveyor cylinder.

[0013] Preferably, the main stirring shaft is rotatably connected inside the cylinder of the main stirring unit, and a stirring arm is fixedly connected to the outside of the main stirring shaft.

[0014] Preferably, the end of the mixing arm away from the main mixing shaft is fixedly connected to a mixing blade, and the bottom end of the mixing main unit cylinder is fixedly connected to a finished product discharge hopper.

[0015] Preferably, a stirring system drive motor is mounted on the outer side of the drive end mounting bracket, and the drive end of the stirring system drive motor is fixedly connected to the main stirring shaft.

[0016] Preferably, a cylinder fixing support is fixedly connected to the outer side of the frame, and the outer side of the cylinder fixing support is fixedly connected to the finished product unloading hopper.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0018] 1. By activating the negative pressure conveying main pipe to generate vacuum suction, the external cement main material and auxiliary materials are precisely sucked into the No. 1 and No. 2 storage metering tanks through closed pipelines. At the same time, the first-stage and second-stage spiral conveying cylinders in the double-spiral feeding and mixing unit form a fully enclosed conveying channel, realizing the complete closure of the material from feeding to mixing. The closed conveying design fundamentally eliminates dust leakage of cement powder during the transfer process, reduces the dust concentration at the construction site, and meets the environmental protection standards for green construction of road and bridge engineering. At the same time, it avoids the material from contacting humid air, prevents cement from becoming damp and clumping, and prevents admixtures from absorbing moisture and failing, ensuring the original activity and quality stability of the cementitious material. It effectively solves the technical defects of existing open or semi-enclosed conveying structures, such as serious dust pollution, harsh working environment, and material deterioration due to moisture, and eliminates the hidden dangers of bridge concrete strength fluctuation and insufficient durability caused by material quality decline.

[0019] 2. By using the built-in metering modules in the No. 1 and No. 2 storage metering tanks, the cement main material and admixture auxiliary materials are independently monitored and quantitatively controlled. After the precise proportion is completed, the bottom discharge valve of the tank is opened simultaneously, allowing the two-component materials to fall into the secondary screw conveyor cylinder at the same time according to the set ratio. After secondary precise control by the built-in flow metering valve of the metering discharge cylinder, they enter the mixing host cylinder. The independent storage design of the two tanks eliminates the risk of cross-contamination between the main material and auxiliary materials. The combination of simultaneous discharge of two materials and precise flow control shortens the batching cycle and achieves a dual improvement in efficiency and precision. This ensures the stability and repeatability of concrete workability and effectively solves the problems of material contamination, low accuracy of manual metering, and large proportion deviation caused by single-tank mixed storage in the existing technology. It also eliminates quality accidents such as concrete segregation, bleeding, or abnormal setting time caused by inaccurate admixture dosage.

[0020] 3. The mixing system drives the dual main mixing shafts to rotate in opposite directions at high speed via a motor. This causes the radially arranged mixing arms and spiral mixing blades to form a complex three-dimensional shear flow field within the mixing host cylinder. This results in the material being subjected to combined shearing, compression, and tumbling forces simultaneously in the axial, radial, and tangential directions, achieving deep homogeneous mixing. The dual-shaft reverse mixing design improves mixing uniformity and shortens mixing time. The strong shearing action effectively breaks down cement agglomerates and aggregate coatings, allowing admixtures to be evenly dispersed in the cementitious materials. This significantly improves the microstructure uniformity of concrete and effectively solves the defects of existing single-shaft mixing technology, such as insufficient mixing strength, poor uniformity, long mixing time, and dead zones. It also avoids engineering quality hazards such as honeycomb surface defects, large strength dispersion, and insufficient durability in bridge concrete caused by insufficient mixing. Attached Figure Description

[0021] Figure 1 A perspective view of a cement batching device for roads and bridges provided by the present invention;

[0022] Figure 2 A schematic diagram of the structure of a double-helix feeding and mixing unit for a cement batching device for roads and bridges provided by the present invention;

[0023] Figure 3 A schematic diagram of the storage, metering, and conveying unit structure of a cement batching device for roads and bridges provided by the present invention;

[0024] Figure 4 A schematic diagram of the transition connecting cylinder structure of a cement batching device for roads and bridges provided by the present invention;

[0025] Figure 5 A schematic diagram of the mixing cylinder structure of a cement batching device for roads and bridges provided by the present invention;

[0026] Figure 6This invention provides a schematic diagram of a dual-shaft high-intensity mixing unit for a cement batching device used in roads and bridges.

[0027] Legend;

[0028] 1. Rack;

[0029] 2. Double spiral feeding and mixing unit; 21. Primary spiral conveyor cylinder; 22. Secondary spiral conveyor cylinder; 23. Spiral conveyor main shaft; 24. Feeding spiral blades; 25. Primary conveyor drive motor;

[0030] 3. Material storage and metering conveying unit; 31. No. 1 material storage and metering tank; 32. No. 2 material storage and metering tank; 33. Negative pressure conveying main pipe; 34. Transition connecting cylinder; 35. Metering and discharging cylinder;

[0031] 4. Dual-shaft high-power mixing unit; 41. Mixing main unit cylinder; 42. Drive end mounting bracket; 43. Main mixing shaft; 44. Mixing arm; 45. Mixing blades; 46. Finished product discharge hopper; 47. Mixing system drive motor; 48. Cylinder fixing bracket. Detailed Implementation

[0032] 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.

[0033] like Figure 1 - Figure 4 As shown, this embodiment provides a technical solution: a cement batching device for roads and bridges, including a frame 1 and a double-helix feeding and mixing unit 2. The double-helix feeding and mixing unit 2 includes a primary helical conveying cylinder 21 fixedly connected to the frame 1, a secondary helical conveying cylinder 22 fixedly connected to the top of the frame 1, a helical conveying main shaft 23 rotatably connected inside both the primary helical conveying cylinder 21 and the secondary helical conveying cylinder 22, a feeding helical blade 24 fixedly connected to the outside of the helical conveying main shaft 23, a primary conveying drive motor 25 fixedly connected to both ends of the outside of the frame 1, and the drive end of the primary conveying drive motor 25 fixedly connected to the helical conveying main shaft 23.

[0034] The frame 1 serves as the core load-bearing and positioning reference component of the device, rigidly fixing all components of the double-spiral feeding and mixing unit 2, the storage and metering conveying unit 3, and the dual-shaft high-power mixing unit 4. This ensures the coaxiality of the installation of each moving part and disperses the vibration load during operation. The primary spiral conveying cylinder 21 serves as a closed channel for primary material conveying, housing the spiral conveying main shaft 23 and the feeding spiral blades 24. It receives materials conveyed by the transition connecting cylinder 34, achieving low-level directional conveying while isolating the material from external air to prevent dust leakage, avoid cement caking due to moisture, and ensure the sealing performance of the conveying channel. The cylinder structure is adapted to the spiral pushing principle, reducing material residue on the wall and improving conveying efficiency. The secondary spiral conveying cylinder 22 serves as a secondary high-level conveying channel, installed at the top of the frame 1, connecting the first and second storage and metering tanks 31 and the transition connecting cylinder 34. This achieves a high-level transfer of materials from the storage tanks to the primary conveying cylinder, forming a graded conveying process with high-level feeding and low-level discharging. The material conveying height is increased to meet the high-level arrangement requirements of storage tanks and reduce the floor space. It works with the first-stage screw conveyor cylinder 21 to form a two-stage conveying system, increasing the material conveying distance and height, and meeting the feeding position requirements of the mixing host cylinder 41. The screw conveyor main shaft 23 serves as the mounting carrier and power transmission shaft for the feeding screw blades 24. One end is connected to the first-stage conveyor drive motor 25. By rotating, it drives the feeding screw blades 24 to move synchronously, realizing the forced pushing of materials. The feeding screw blades 24 are fixed on the outside of the screw conveyor main shaft 23 and adopt a spiral curved surface structure. When rotating, they generate axial pushing force, while pre-mixing and loosening the materials, breaking the cement block structure, realizing continuous and uniform material conveying, and completing pre-mixing and arch breaking. This avoids material bridging and blockage during the conveying process, improves material flowability, and lays a homogeneous foundation for subsequent dual-shaft powerful mixing. The first-stage conveyor drive motor 25 provides independent driving power for the screw conveyor main shaft 23. By controlling the motor speed, the material conveying flow rate is adjusted to meet different batching ratio requirements.

[0035] like Figure 1 - Figure 4 As shown, the storage metering and conveying unit 3 includes a first storage metering tank 31 fixedly connected to the top of the secondary spiral conveying cylinder 22, a second storage metering tank 32 fixedly connected to the side of the top of the secondary spiral conveying cylinder 22 away from the first storage metering tank 31, a negative pressure conveying main pipe 33 fixedly connected to the top of both the first and second storage metering tanks 31, a transition connecting cylinder 34 fixedly connected to the bottom of the secondary spiral conveying cylinder 22, a metering discharge cylinder 35 fixedly connected to the bottom outer side of the primary spiral conveying cylinder 21, and the bottom of the transition connecting cylinder 34 fixedly connected to the primary spiral conveying cylinder 21.

[0036] The No. 1 metering tank 31 is an independent storage container installed at the top of the secondary screw conveyor cylinder 22. It is used to store the main cement material. The tank has a built-in metering module to monitor the material inventory and quantitatively feed the cement. Separate storage compartments prevent material mixing and contamination. The metering function ensures the accuracy of the main material supply, controls the batching ratio from the source, and ensures the core performance of concrete. It is suitable for the purity requirements of materials in road and bridge engineering. The No. 2 metering tank 32 is symmetrically arranged with the No. 1 metering tank 31. It is used to store admixtures, additives, and other auxiliary materials. It also integrates a metering module to achieve synchronous quantitative supply of auxiliary materials and main materials. The parallel design of the two tanks improves batching efficiency. The independent storage of auxiliary materials avoids cross-contamination with the main materials. The metering accuracy ensures the accurate dosage of admixtures, optimizes the workability of concrete, and is suitable for the customized needs of concrete in complex road and bridge engineering conditions. The negative pressure conveying main pipe 33 connects the external material source to the metering tanks. Using the principle of negative pressure pneumatic conveying, this system achieves closed-loop feeding of powdery materials, avoiding excessive contact between materials and air during conveying, resulting in no dust and no leakage, meeting the environmental protection requirements for green construction in road and bridge engineering. Closed-loop conveying reduces the risk of cement clumping due to moisture, ensuring material quality, while also reducing the health impact of dust pollution on workers at the construction site. The transition connecting cylinder 34 connects the bottom of the secondary spiral conveyor cylinder 22 to the primary spiral conveyor cylinder 21, employing a conical guide structure to achieve a smooth transition of materials from secondary to primary conveying, avoiding material accumulation, eliminating blind spots at corners in the conveying path, preventing material jamming and leakage, and ensuring the continuity of the conveying process. The sealed connection design further enhances the overall airtightness, reducing dust leakage. The metering discharge cylinder 35 is installed at the bottom outer side of the primary spiral conveyor cylinder 21, with a built-in flow metering valve to precisely control the material discharge amount and speed.

[0037] like Figure 1 , Figure 5 and Figure 6 As shown, the dual-shaft high-power mixing unit 4 includes a mixing host cylinder 41 fixedly connected to the outside of the frame 1. A drive end mounting bracket 42 is fixedly connected to the outside of the mixing host cylinder 41. A main mixing shaft 43 is rotatably connected inside the mixing host cylinder 41. A mixing arm 44 is fixedly connected to the outside of the main mixing shaft 43. A mixing blade 45 is fixedly connected to the end of the mixing arm 44 away from the main mixing shaft 43. A finished product discharge hopper 46 is fixedly connected to the bottom end of the mixing host cylinder 41. A mixing system drive motor 47 is mounted on the outside of the drive end mounting bracket 42. The drive end of the mixing system drive motor 47 is fixedly connected to the main mixing shaft 43. A cylinder fixing bracket 48 is fixedly connected to the outside of the frame 1. The outside of the cylinder fixing bracket 48 is fixedly connected to the finished product discharge hopper 46.

[0038] The mixing main unit cylinder 41 serves as a sealed cavity for the final mixing of materials. It receives the materials conveyed by the metering and feeding cylinder 35, providing a closed working space for the dual-shaft mixing and preventing overflow and dust generation during the mixing process. The sealed structure reduces dust pollution and material waste. The cylinder volume is adapted to the batch mixing needs of road and bridge engineering projects. The smooth inner wall design reduces material residue, improves mixing efficiency and material utilization. The drive end mounting bracket 42 is fixed to the outside of the mixing main unit cylinder 41 and is used to install the mixing system drive motor 47. This ensures the coaxiality of the motor output shaft and the main mixing shaft 43, reduces vibration and offset during transmission, lowers transmission loss and noise, and extends the service life of transmission components such as the motor and shaft. The rigid support structure enhances the stability of the drive end, preventing motor loosening during mixing and ensuring continuous output of mixing power. The main mixing shaft 43 serves as the mounting carrier for the mixing arm 44 and the mixing blades 45, connecting to the mixing system drive motor 47. High-speed rotation drives the mixing components to achieve material shearing and convection mixing. The dual-shaft design creates counter-rotation, increasing the mixing intensity. The shaft body is made of high-strength alloy material, adaptable to the mixing resistance of high-viscosity cement mixtures, preventing shaft deformation and ensuring mixing stability. The mixing arm 44 connects the main mixing shaft 43 and the mixing blades 45, employing a radial arrangement to extend the effective radius of the mixing blades 45 and expand the mixing coverage area. To avoid dead zones in the mixing process and improve mixing uniformity, ensuring that materials in all areas of the mixing cylinder are adequately sheared; the rigid structure of the boom adapts to the load requirements of heavy-duty mixing, preventing breakage or deformation and extending the service life of the mixing components; the mixing blades 45 are fixed to the end of the mixing boom 44, adopting a spiral or plow-shaped structure, which generates shearing, squeezing, and tumbling forces on the materials during rotation, achieving deep homogeneous mixing of materials, quickly eliminating material segregation, ensuring uniform distribution of components such as cement, admixtures, and aggregates, improving the homogeneity of the mixture, and avoiding quality defects such as honeycomb, pitting, and insufficient strength in road and bridge construction; the finished product discharge hopper 46 is installed at the bottom of the mixing host cylinder 41, using a funnel design. The structure is designed to centrally guide the finished mixture, making it suitable for receiving materials from on-site transport vehicles and pumping equipment. The mixing system drive motor 47 provides high-torque drive power to the dual main mixing shafts 43. The mixing speed is adjusted through a reduction mechanism to meet the mixing requirements of high-viscosity, high-volume cement mixtures. It has strong power and stable output, ensuring thorough mixing without dead zones. It supports frequency conversion speed regulation, which can adjust the mixing intensity according to the viscosity of the mixture, adapting to the mixing requirements of different types of road and bridge concrete. The cylinder body fixing support 48 connects the frame 1 and the finished product unloading hopper 46, and the mixing host cylinder body 41 and the frame 1 are rigidly fixed to form an integral whole, dispersing the vibration load generated during the mixing process.

[0039] Working principle;

[0040] like Figure 1 - Figure 6 As shown;

[0041] In actual use, the negative pressure conveying main pipe 33, the primary conveying drive motor 25, and the mixing system drive motor 47 are first activated. This drives the external cement main material and auxiliary materials to be precisely drawn into the No. 1 and No. 2 storage metering tanks 31 and 32 respectively through the negative pressure conveying main pipe 33. After the built-in metering module in the tank completes the quantitative proportioning, the bottom discharge valve of the tank opens, allowing the materials to fall synchronously into the secondary screw conveyor cylinder 22. Then, the primary conveying drive motor 25 drives the screw conveying main shaft 23 inside the primary and secondary screw conveying cylinders 21 and 22 to rotate synchronously. This causes the feeding screw blades 24 on the outside of the screw conveying main shaft 23 to rotate, generating axial pushing force, thus achieving continuous material conveying. Simultaneously, pre-mixing and loosening are completed, which in turn drives the material to be smoothly introduced into the primary spiral conveyor cylinder 21 through the conical guide structure of the transition connecting cylinder 34. Then, the flow metering valve built into the metering discharge cylinder 35 precisely controls the discharge speed, driving the material to be stably transported into the mixing host cylinder 41. Then, the mixing system drive motor 47 drives the double main mixing shafts 43 in the mixing host cylinder 41 to rotate in the opposite direction, driving the mixing arm 44 and mixing blades 45 on the outside of the main mixing shaft 43 to operate synchronously, applying a combination of shearing, extrusion and tumbling forces to the material, achieving deep homogeneous mixing of the material. Finally, the homogeneous mixture after mixing is smoothly discharged into the material receiving equipment at the construction site through the finished product discharge hopper 46.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A cement batching device for roads and bridges, comprising a frame (1), characterized in that, It also includes a double spiral feeding and mixing unit (2), which includes a first-stage spiral conveying cylinder (21) fixedly connected to the frame (1), a second-stage spiral conveying cylinder (22) fixedly connected to the top of the frame (1), and a spiral conveying main shaft (23) rotatably connected inside both the first-stage spiral conveying cylinder (21) and the second-stage spiral conveying cylinder (22), and a feeding spiral blade (24) fixedly connected to the outside of the spiral conveying main shaft (23). The storage metering and conveying unit (3) includes a first storage metering tank (31) fixedly connected to the top of the secondary spiral conveying cylinder (22), and a second storage metering tank (32) fixedly connected to the side of the top of the secondary spiral conveying cylinder (22) away from the first storage metering tank (31). The dual-shaft high-power stirring unit (4) includes a stirring host cylinder (41) fixedly connected to the outside of the frame (1), and a drive end mounting bracket (42) is fixedly connected to the outside of the stirring host cylinder (41).

2. A cement batching device for roads and bridges according to claim 1, characterized in that: The outer ends of the frame (1) are fixedly connected to a primary conveying drive motor (25), and the drive end of the primary conveying drive motor (25) is fixedly connected to the spiral conveying main shaft (23).

3. A cement batching device for roads and bridges according to claim 1, characterized in that: The top of both the No. 1 storage metering tank (31) and the No. 2 storage metering tank (32) are fixedly connected to a negative pressure conveying main pipe (33).

4. A cement batching device for roads and bridges according to claim 3, characterized in that: The bottom end of the secondary spiral conveyor cylinder (22) is fixedly connected to a transition connecting cylinder (34), and the bottom outer side of the primary spiral conveyor cylinder (21) is fixedly connected to a metering discharge cylinder (35).

5. A cement batching device for roads and bridges according to claim 4, characterized in that: The bottom end of the transition connecting cylinder (34) is fixedly connected to the primary spiral conveying cylinder (21).

6. A cement batching device for roads and bridges according to claim 1, characterized in that: The main stirring shaft (43) is rotatably connected inside the cylinder body (41) of the main stirring host, and a stirring arm (44) is fixedly connected to the outside of the main stirring shaft (43).

7. A cement batching device for roads and bridges according to claim 1, characterized in that: The mixing arm (44) is fixedly connected to a mixing blade (45) at the end away from the main mixing shaft (43), and the bottom of the mixing host cylinder (41) is fixedly connected to a finished product unloading hopper (46).

8. A cement batching device for roads and bridges according to claim 1, characterized in that: A stirring system drive motor (47) is installed on the outside of the drive end mounting bracket (42), and the drive end of the stirring system drive motor (47) is fixedly connected to the main stirring shaft (43).

9. A cement batching device for roads and bridges according to claim 1, characterized in that: A cylinder fixing support (48) is fixedly connected to the outside of the frame (1), and the outside of the cylinder fixing support (48) is fixedly connected to the finished product unloading hopper (46).

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