Slag production roadbed soil stirring device

Abstract

The application discloses a slag production subgrade soil stirring device, and relates to the technical field of engineering building slag production subgrade soil and contaminated soil repair. The device comprises a hopper, a cutting and stirring mechanism, a nozzle and a driving mechanism. The cutting and stirring mechanism is a pagoda-shaped structure composed of a cutting head, a cutting arm and a rotating shaft, is located in the hopper and is used for cutting and stirring the input materials in a rotating mode. The nozzle is arranged on the hopper and is used for spraying a slag treatment agent. The technical scheme in the application can continuously apply shearing force and transverse thrust to materials of different heights through the pagoda-shaped cutting and stirring mechanism, promotes the continuous movement of the materials in the horizontal and vertical directions, prevents the arching, blocking and jamming of the materials in the hopper, and the layered cutting and stirring of the materials by the layered pagoda-shaped cutting and stirring mechanism, avoids the formation of dead angles and improves the mixing uniformity of the materials.

Description

Technical Field

[0001] This utility model relates to the technical field of engineering construction waste soil production roadbed soil and contaminated soil remediation, specifically, to a mixing device for waste soil production roadbed soil. Background Technology

[0002] Urban construction generates large amounts of excavated soil, dewatered pile slurry, and solidified soil, as well as contaminated soil. Due to environmental protection requirements, these construction wastes and contaminated soils need to be properly treated. Current treatment methods involve using traditional water-stabilized soil mixing plants and other complete sets of equipment to crush the construction waste, then adding amendments and stabilizers to produce improved roadbed soil for backfilling in roadbed base construction. For contaminated soil, remediation agents and stabilizers are added, and appropriate equipment is used for soil remediation to prepare standard-compliant planting soil for harmless backfilling.

[0003] Currently, whether producing roadbed improvement soil or qualified planting soil after soil remediation, the equipment used is all complete sets of equipment such as water-stabilized mixing plants (or stabilized soil mixing plants). These devices typically use two parallel horizontal shafts equipped with spiral or arc-shaped mixing blades as mixing shafts, such as the commonly used Chen-type twin-shaft mixer. The two mixing shafts rotate in opposite directions, causing the materials to mix alternately in the middle. The blades of the two mixing shafts are of the same length and cover the entire width of the shaft laterally. However, in actual use, this type of twin-shaft mixer has the following problems:

[0004] 1) Hopper arching (blockage): Due to the close cross-section of the mixing shaft and the hopper, and the lack of layered cutting design, the entire mixing cross-section is subjected to force simultaneously, resulting in limited cutting ability and an inability to cut large pieces of soil. After the material is poured into the hopper, especially for soils with high moisture content and high viscosity, the upper layer of material cannot fall smoothly due to excessive internal friction and adhesion, or excessively large particles, forming an arch-like structure. Although the bottom of the hopper is open, the upper arch supports the material, preventing it from flowing naturally into the lower mixing unit, resulting in arching. 2) Mixing shaft jamming: The small gap between the blades of the twin-shaft mixer limits its cutting ability for sticky soil and large pieces of material. When the material is highly viscous or the particles are large, the frictional resistance of the blades increases, and the mixing shaft may not be able to rotate normally, leading to overload of the motor or reducer and jamming of the mixer. 3) Uneven mixing: The mixing range of the twin-shaft mixer is limited, and dead zones easily form in the lower and corner areas. Material tends to remain in these dead zones and cannot be fully mixed, resulting in insufficient cutting or inadequate mixing. The opposing rotation of the two shafts mainly creates an interlaced mixing zone in the middle of the mixing shaft, while the material flow in the upper and corner areas of the hopper is insufficient, resulting in the material in these areas not being able to fully participate in the mixing, thus reducing the overall mixing uniformity. Utility Model Content

[0005] The purpose of this invention is to address the problems of hopper arching, mixing shaft jamming, and uneven mixing in existing mixers by providing a mixing device for roadbed soil production. Through a pagoda-shaped cutting and mixing mechanism, the device achieves layered cutting and mixing of materials in the hopper, promoting continuous movement of materials in both horizontal and vertical directions. This disrupts the static support relationship between materials, prevents hopper arching or blockage, and improves the uniformity of material mixing and the operational reliability of the device.

[0006] The technical solution of this utility model is: to provide a mixing device for producing roadbed soil for slag production, the device including: a hopper, a cutting and mixing mechanism, a nozzle and a driving mechanism;

[0007] The cutting and stirring mechanism is located in the center of the hopper and includes a cutting head, a cutting arm, and a rotating shaft. The rotating shaft is connected to an external drive mechanism and is used to rotate under the action of the drive mechanism. The cutting arm is fixed laterally on the rotating shaft and is used to rotate with the rotating shaft and stir the material. The cutting head is fixed on the cutting arm and is used to rotate with the cutting arm and cut the material. The nozzle is located on the hopper and is used to spray in the slag treatment agent.

[0008] Furthermore, the hopper is formed by connecting a feed hopper and a receiving hopper. The feed hopper is located above the receiving hopper. The feed hopper is used to receive and temporarily store the input materials, and the receiving hopper is used to collect and store the falling materials.

[0009] Furthermore, the upper part of the rotating shaft is located inside the hopper, passing through the receiving hopper from bottom to top and extending into the feed hopper, while the lower part of the rotating shaft extends out of the receiving hopper and is fixedly connected to an external drive mechanism.

[0010] Furthermore, the cutting arms are fixed on the rotating shaft at equal intervals from top to bottom in a layered manner. The length of a single layer of cutting arms is the same, and the length of the cutting arms between different layers increases from top to bottom. The single layer of cutting arms is uniformly fixed in the circumferential direction of the rotating shaft in the horizontal direction, and the cutting head is fixed at an angle on the cutting arms. The layered cutting arms are located in the upper part of the rotating shaft, wherein the cutting arms distributed in the upper part are located in the feed hopper, and the cutting arms distributed in the lower part are located in the receiving hopper.

[0011] Furthermore, the nozzle is located on the side wall near the upper edge of the receiving hopper and is connected to the pipeline for external input treatment agent, used to spray the slag treatment agent during the cutting and mixing process of the cutting and mixing mechanism.

[0012] Furthermore, the mixing device for roadbed soil production also includes a bearing support; the bearing support is mounted on the rotating shaft and fixedly connected to the lower edge of the receiving hopper, and the bearing support is used to rotatably connect the rotating shaft and the receiving hopper, as well as to support the hopper.

[0013] Furthermore, the mixing device for roadbed soil production also includes a mixing disc, which is fixed on the rotating shaft and located at the lower part of the inner side of the receiving hopper. It rotates synchronously with the rotating shaft to assist the cutting arm in mixing the material at the bottom of the receiving hopper.

[0014] The beneficial effects of this utility model are:

[0015] First, the technical solution of this utility model sets up a layered, pagoda-shaped cutting and stirring mechanism in the hopper. The length of the cutting arms between different layers increases from top to bottom. The cutting head is tilted and fixed on the cutting arm, which can apply effective cutting and shearing forces to the material. The cutting arm and cutting head of the upper layer can perform preliminary cutting and stirring of the material, so that the material is quickly crushed and falls. The cutting arm and cutting head of the lower layer can perform full cutting and stirring of the falling material, improving the mixing uniformity. The cutting arm and cutting head of each layer can apply shearing force and lateral thrust to the material at different heights, causing the material to move continuously in the horizontal and vertical directions, destroying the static support relationship between the materials, and effectively preventing arching or blockage in the hopper.

[0016] Secondly, the technical solution of this utility model is to set up a pagoda-shaped cutting and stirring mechanism arranged in layers in the hopper. The space above it is large enough to accommodate large pieces of material and is not easily blocked by highly viscous materials. During the rotation, it can continuously apply shearing force and lateral thrust to the material, forcing the material to move continuously in the horizontal and vertical directions, and gradually break it up during the movement, making it less likely to get stuck.

[0017] Third, the technical solution of this utility model sets up a pagoda-shaped cutting and stirring mechanism arranged in layers in the hopper, which can perform layered cutting and stirring of materials. The upper cutting arm and the cutting head set on it perform preliminary cutting and stirring, while the lower cutting arm and the cutting head set on it further crush and uniformly stir the lower layer of materials, avoiding the formation of dead corners and improving the overall mixing uniformity of materials. Attached Figure Description

[0018] The advantages of the above and / or additional aspects of this utility model will become apparent and readily understood in the description of the embodiments taken in conjunction with the following drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the overall structure of a mixing device for roadbed soil production according to an embodiment of the present invention;

[0020] Figure 2 This is a longitudinal cross-sectional view of a mixing device for roadbed soil production according to an embodiment of the present invention;

[0021] Figure 3 This is a front view of a mixing device for producing roadbed soil for slag production according to an embodiment of the present utility model;

[0022] Figure 4 This is a top view of a mixing device for producing roadbed soil for slag production according to an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the cutting and stirring mechanism according to an embodiment of the present invention.

[0024] Among them, 1-hopper, 11-feed hopper, 12-receiving hopper, 2-cutting and stirring mechanism, 21-cutting head, 22-cutting arm, 23-rotating shaft, 3-nozzle, 4-drive mechanism, 5-bearing support, 6-stirring disc. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0026] In the following description, many specific details are set forth in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] like Figure 1 As shown in the figure, this embodiment provides a mixing device for roadbed soil production of slag and soil. The device includes: a hopper 1, a cutting and mixing mechanism 2, a nozzle 3, and a driving mechanism 4.

[0028] The hopper 1 is composed of a feed hopper 11 and a receiving hopper 12 connected together. The feed hopper 11 is located at the upper part of the hopper 1 and is an inverted frustum shape. It is used to receive and temporarily store the input materials so that the materials can fall smoothly into the receiving hopper 12. The receiving hopper 12 is located at the lower part of the hopper 1 and is used to collect and store the falling materials so as to achieve centralized mixing of the materials.

[0029] The cutting and stirring mechanism 2 is located in the center of the hopper 1, and is used to cut and stir the input material by rotating.

[0030] The cutting and stirring mechanism 2 includes a cutting head 21, a cutting arm 22, and a rotating shaft 23. The rotating shaft 23 is connected to an external drive mechanism 4 and is used to rotate under the action of the drive mechanism 4. The cutting arm 22 is horizontally fixed on the rotating shaft 23 and is used to rotate with the rotating shaft 23 and stir the material in the hopper 1. The cutting head 21 is fixed on the cutting arm 22 and is used to rotate with the cutting arm 22 and cut the material in the hopper 1.

[0031] In this embodiment, the horizontal direction is defined as the transverse direction, and the vertical direction is defined as the longitudinal direction.

[0032] Specifically, the upper part of the rotating shaft 23 is set inside the hopper 1, passing through the receiving hopper 12 from bottom to top and extending into the feeding hopper 11. The lower part of the rotating shaft 23 extends out of the receiving hopper 12 and is fixedly connected to the external drive mechanism 4 (if the drive mechanism 4 is a motor, the lower end of the rotating shaft 23 is connected to the motor output shaft through a coupling). It can rotate under the driving action of the drive mechanism 4 to drive the cutting arm 22 and the cutting head 21 to rotate, thereby realizing the cutting and stirring of the input material.

[0033] Specifically, the cutting arms 22 are fixed to the rotating shaft 23 at equal intervals from top to bottom in a layered manner. The length of each layer of the cutting arms 22 is the same, and the length of the cutting arms 22 between different layers increases from top to bottom. The overall structure is pagoda-shaped. The single-layer cutting arms 22 are evenly fixed to the circumference of the rotating shaft 23 in the horizontal direction. The cutting head 21 is fixed at an angle to the cutting arms 22. The angle between the cutting head 21 and the horizontal plane is between 10° and 80°, which can apply effective cutting force and shearing force to the material.

[0034] The layered cutting arms 22 are located on the upper part of the rotating shaft 23. The upper cutting arms 22 are located in the feed hopper 11, and the lower cutting arms 22 are located in the receiving hopper 12. The upper cutting arms 22 and the cutting heads 21 on them are used to perform preliminary cutting and stirring on the material in the feed hopper 11, so that the material is quickly crushed and falls. At the same time, the material is driven to rotate horizontally to destroy the supporting structure between the materials in the feed hopper 11 and prevent arching. The lower cutting arms 22 and the cutting heads 21 on them are used to fully cut and stir the material falling into the receiving hopper 12, so as to achieve uniform mixing of the material and improve the mixing uniformity.

[0035] It should be noted that the key to material arching is that the materials are stationary and mutually supportive. Existing water-stabilized mixing plants use two parallel horizontal shafts with cross-sectional dimensions close to the hopper cross-section. These parallel horizontal shafts rotate in opposite directions. Since the cutting paths of the parallel horizontal shafts are mainly located in the same horizontal plane, their cutting capacity is limited. When materials with high adhesion or large particles enter the hopper, the parallel horizontal shafts can only move the materials up and down by vertical clamping, and cannot achieve effective displacement and dispersion in the horizontal direction. This causes the materials to easily support each other in the hopper and form an arch structure, thus producing arching. In contrast, this application uses a pagoda-shaped cutting and mixing mechanism. Each layer of cutting arm 22 and the cutting head 21 can apply shearing force and lateral thrust to materials at different heights, forcing the materials to continuously undergo relative displacement in the horizontal and vertical directions (due to gravity), forming a flow channel from top to bottom. This structure allows the materials to slide smoothly downwards during the continuous crushing and dispersion process, destroying the static support relationship between the materials and effectively preventing materials from arching or blocking in the hopper.

[0036] Furthermore, the existing parallel horizontal shaft dual-axis structure has a small gap, making it unable to cut large pieces of material first. Its cutting ability for sticky soil and large pieces of material is limited. When the material is highly viscous or the particles are large, the cutting resistance increases, and jamming is likely to occur. In contrast, the pagoda-shaped cutting and stirring mechanism used in this application has a large space above it, which can accommodate large pieces of material and is not easily blocked by highly viscous materials (small contact area). During rotation, it can continuously apply shearing force and lateral thrust to the material, forcing the material to continuously move in both horizontal and vertical directions, and gradually break it up during the movement, making jamming less likely. The parallel horizontal shaft dual-shaft mixing range is limited and lacks a layered cutting and mixing design. Dead corners are easily formed in the lower and corner areas, where materials tend to remain and cannot be fully mixed and stirred, resulting in low overall mixing uniformity. In contrast, the pagoda-shaped cutting and mixing mechanism used in this application is designed for layered cutting and mixing. The upper cutting arm 22 and the cutting head 21 on it perform initial cutting and mixing, while the lower cutting arm 22 and the cutting head 21 on it further crush and uniformly stir the lower layer of materials, avoiding the formation of dead corners and significantly improving the overall mixing uniformity.

[0037] In this embodiment, the number of cutting heads 21 can be set according to the specific operating efficiency of the equipment. The more the equipment operates, the more heads are set, and the fewer the equipment operates, the fewer heads are set.

[0038] Nozzle 3 is located on the side wall near the upper edge of receiving hopper 12. It is connected to the pipeline for external input treatment agents (including modifiers, stabilizers, repair agents, etc.) and is used to spray slag treatment agents during the cutting and mixing process of cutting and mixing mechanism 2.

[0039] In this embodiment, the nozzle injection volume is related to the equipment's operating efficiency. Higher equipment operating efficiency results in a larger flow rate and injection volume, while lower equipment operating efficiency results in a smaller flow rate and injection volume. The flow rate can be controlled by installing regulating valves, flow control valves, or proportional valves on external pipelines to meet production needs.

[0040] The drive mechanism 4 is used to drive the rotating shaft 23 to rotate.

[0041] In this embodiment, the drive mechanism 4 can be an electric motor, a geared motor, a gear transmission mechanism, a hydraulic motor, or other devices capable of driving the rotating shaft 23 to rotate.

[0042] The mixing device for roadbed soil in slag production also includes a bearing support 5. The bearing support 5 is mounted on the rotating shaft 23 and fixedly connected to the lower edge of the receiving hopper 12. The lower end of the receiving hopper 12 is provided with a cylindrical structure extending into the interior of the receiving hopper 12. The inner diameter of the through hole of the cylindrical structure matches the diameter of the rotating shaft 23. After the rotating shaft 23 is assembled with the receiving hopper 1, the rotating shaft 23 can fit against the cylindrical structure and rotate freely within its through hole to prevent material from entering. The bearing support 5 is used to rotatably connect the rotating shaft 23 and the receiving hopper 12, reducing the friction between the rotating shaft 23 and the receiving hopper 12, allowing the rotating shaft 23 to rotate freely. The bearing support 5 is also used to support the receiving hopper 1.

[0043] It should be noted that the bearing support 5 needs to withstand both radial force (the pressure generated by lateral swaying when the material distribution inside the hopper 1 is uneven) and axial force (i.e., the gravitational pressure generated by the material and the hopper 1). It can be equipped with angular contact ball bearings, tapered roller bearings, self-aligning roller bearings, etc., and all of these bearings are equipped with dust covers and dust rings to effectively prevent dust, moisture, and impurities from entering the bearing, avoiding grease contamination or loss, thereby extending the bearing's service life and maintaining stable operation. During connection, the edge of the lower cylindrical structure of the receiving hopper 12 is fixedly connected to the outer ring of the bearing, and the rotating shaft 23 is fixedly connected to the inner ring of the bearing. A gap is left between the inner ring of the bearing and the lower edge of the cylindrical structure to avoid friction.

[0044] The mixing device for roadbed soil production also includes a mixing disc 6, which is fixed on the rotating shaft 23 and located at the lower part of the inner side of the receiving hopper 12. It rotates synchronously with the rotating shaft 23 to assist the cutting arm 22 in mixing the material at the bottom of the receiving hopper 12, preventing the material at the bottom from settling, expanding the mixing range, and making the mixing more uniform.

[0045] The working principle of the slag and soil mixing device for roadbed soil production provided in this embodiment is as follows:

[0046] Turn on the drive mechanism 4 to drive the rotating shaft 23 to rotate and feed the prepared material into the feed hopper 11. The cutting arms 22 and the cutting heads 21 on the upper layer perform preliminary cutting and stirring of the large pieces of material, so that the material is quickly crushed and falls to prevent arching. At the same time, open the nozzle 3 and spray the prepared material treatment agent into the nozzle 3. The cutting arms 22 and the cutting heads 21 on the lower layer perform thorough cutting and stirring of the material falling into the receiving hopper 12, so that the material and the sprayed material treatment agent are evenly mixed to achieve improvement. After the stirring is completed, turn off the drive mechanism 4, invert the stirring device, and pour out the improved material for subsequent harmless backfilling.

[0047] In this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0048] The shapes of the components in the accompanying drawings are schematic and may differ from their actual shapes. The drawings are only used to illustrate the principle of this utility model and are not intended to limit this utility model.

[0049] Although the present invention has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of the present invention. The scope of protection of the present invention is defined by the appended claims and may include various modifications, alterations, and equivalents made to the invention without departing from the scope and spirit of the present invention.

Claims

1. A mixing device for producing roadbed soil from slag and waste soil, characterized in that, The device includes: a hopper (1), a cutting and stirring mechanism (2), a nozzle (3), and a drive mechanism (4). The cutting and stirring mechanism (2) is located in the center of the hopper (1). It includes a cutting head (21), a cutting arm (22), and a rotating shaft (23). The rotating shaft (23) is connected to an external driving mechanism (4) and is used to rotate under the action of the driving mechanism (4). The cutting arm (22) is fixed laterally on the rotating shaft (23) and is used to rotate with the rotating shaft (23) and stir the material. The cutting head (21) is fixed on the cutting arm (22) and is used to rotate with the cutting arm (22) and cut the material. The nozzle (3) is located on the hopper (1) and is used to spray in the slag treatment agent. The hopper (1) is formed by connecting the feed hopper (11) and the receiving hopper (12). The feed hopper (11) is located above the receiving hopper (12). The feed hopper (11) is used to receive and temporarily store the input materials, and the receiving hopper (12) is used to collect and store the falling materials. The cutting arms (22) are fixed on the rotating shaft (23) at equal intervals from top to bottom in a layered manner. The length of each layer of cutting arms (22) is the same, and the length of the cutting arms (22) between different layers increases from top to bottom. The cutting arms (22) are fixed evenly in the circumferential direction of the rotating shaft (23) in the horizontal direction. The cutting head (21) is fixed at an angle on the cutting arms (22). The layered cutting arms (22) are located in the upper part of the rotating shaft (23). The cutting arms (22) distributed in the upper part are located in the feed hopper (11), and the cutting arms (22) distributed in the lower part are located in the receiving hopper (12).

2. The mixing device for roadbed soil production as described in claim 1, characterized in that, The upper part of the rotating shaft (23) is located inside the hopper (1), passing through the receiving hopper (12) from bottom to top and extending into the feeding hopper (11). The lower part of the rotating shaft (23) extends out of the receiving hopper (12) and is fixedly connected to the external driving mechanism (4).

3. The mixing device for roadbed soil production as described in claim 1, characterized in that, The nozzle (3) is located on the side wall near the upper edge of the receiving hopper (12), and is connected to the pipeline for external input treatment agent, for spraying slag treatment agent during the cutting and stirring process of the cutting and stirring mechanism (2).

4. The mixing device for roadbed soil production as described in claim 1, characterized in that, The mixing device for roadbed soil production of slag soil also includes a bearing support (5); the bearing support (5) is set on the rotating shaft (23) and fixedly connected to the lower edge of the receiving hopper (12). The bearing support (5) is used to rotatably connect the rotating shaft (23) and the receiving hopper (12) and to support the hopper (1).

5. The mixing device for roadbed soil production as described in claim 1, characterized in that, The mixing device for roadbed soil production of slag soil also includes a mixing plate (6), which is fixed on the rotating shaft (23) and located in the lower part of the inner side of the receiving hopper (12). It rotates synchronously with the rotating shaft (23) to assist the cutting arm (22) in mixing the material in the lower part of the receiving hopper (12).

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