Mixer for preparing soil samples for roadbed filling of construction waste

Abstract

This utility model relates to the technical field of building material test specimen manufacturing equipment, and in particular to a mixer for making test specimens of construction waste roadbed filling soil. It includes a receiving device, a discharge pipe, material baffles, baffles, a centrifuge, centrifugal baffles, and a distribution chamber. The discharge pipe is a square tube with an expanded distribution chamber at its bottom. The receiving device is installed at the top of the discharge pipe. Multiple material baffles are installed inside the discharge pipe; each baffle is a concave chute or a flat chute with side baffles. The lower end of the chute's working surface converges inward. A baffle is located at the bottom of the material baffles, at the center of the connection between the discharge pipe and the distribution chamber. The centrifuge is installed inside the distribution chamber, below the baffles. The centrifugal baffles have at least two layers, surrounding the centrifuge and installed within the distribution chamber. This mixer has the function of real-time uniform mixing and distribution without material retention during the process, and is suitable for making test specimens with continuously changing material ratios.

Description

Technical Field

[0001] This utility model relates to the technical field of building material test specimen manufacturing equipment. Background Technology

[0002] To address the problem of construction waste, sorting and reusing construction waste is currently the main research direction. Among the most numerous and difficult-to-process construction wastes, waste bricks and concrete gravel are being crushed and used as raw materials for brick making, as aggregates for new concrete manufacturing, or as filling soil for roadbeds and building foundations. Due to their high feasibility, these materials are being promoted and used.

[0003] When using crushed waste bricks and concrete aggregates as roadbed fill, the physical properties of the crushed material differ significantly from those of conventional fill soil. Furthermore, the properties of crushed raw materials made from different grades of concrete and different specifications of waste bricks vary. To ensure the consistency of roadbed quality after use as fill soil, it is necessary to manufacture fill soil specimens with different mix proportions before construction to conduct performance tests and obtain the applicable mix proportion for that batch of crushed material. Due to the large amount of fill soil used in road construction, the large construction distance span, and the large number of batches of crushed material involved, a large number of test specimens need to be manufactured and tested, which causes difficulties for related construction and production work.

[0004] To address the aforementioned issues, the applicant disclosed a specimen mixing device in its utility model patent application No. 202520784093.5, entitled "Specimen Mixing Tool for Mix Proportioning Test of Construction Waste Roadbed Filling Soil". This device enables continuous variation of the mixing ratio in a single specimen, thereby allowing the specimen performance under different mixing ratios to be collected by testing at different locations on a single specimen, significantly reducing the workload of specimen preparation and testing.

[0005] However, further experimental research on this scheme revealed that its continuously variable proportion feeding method is prone to problems such as uneven mixing and uneven feeding in the specimens. The former is reflected in the fact that different types of materials whose proportions are determined by the position of the partition need to be continuously mixed during the falling process. In order to ensure the accuracy of the specific proportions determined by the feeding time, conventional mixing chambers and agitators, which may cause material retention, cannot be used. The latter is reflected in the difficulty of the material distribution operation in the specimen box after feeding. Similarly, schemes that may cause material retention, such as orifice plate feeders, cannot be used, resulting in a conical interface for the same proportion of material in the specimen box, which seriously affects the accuracy of test data acquisition. Summary of the Invention

[0006] Therefore, in order to solve the problems of mixing and smoothing of materials during the continuous variable ratio feeding process, a mixer with the function of real-time uniform mixing and distribution, and without material retention during the process, should be designed.

[0007] A mixer for preparing soil samples for roadbed filling of construction waste includes a receiving device, a discharge pipe, a material baffle, a centrifuge, a centrifugal baffle, and a material distribution chamber.

[0008] The material discharge pipe is a square tube with an expanded material distribution chamber at the bottom. The receiving device is installed at the top of the material discharge pipe. Multiple material baffles are installed inside the material discharge pipe. The material baffles are concave chutes or flat chutes with side baffles. The lower end of the working surface of the chutes converges inward to constrain the dispersed falling material, so that the material tends to concentrate inward during the falling process. A baffle is installed at the bottom of the material baffle, and the baffle is located at the center of the connection between the material discharge pipe and the material distribution chamber. The centrifuge is installed inside the material distribution chamber, below the baffle. The centrifuge baffle has at least two layers and is installed around the centrifuge inside the material distribution chamber.

[0009] The centrifuge includes a motor, centrifugal blades and blade support. The centrifugal blades are connected to the motor for transmission through the blade support. The innermost lower end of the centrifugal baffle converges inward to form an inverted cone with an open top.

[0010] When the mixer is working, the motor is started and driven by the blade support to drive the centrifugal blades to rotate continuously. The vibration generated by the rotation of the motor, blade support and centrifugal blades is transmitted outward through the motor mounting structure, causing the discharge pipe, distribution chamber, receiving device, baffle and centrifugal baffle to vibrate together.

[0011] The material is output and falls at a uniform speed from the feeding tool above the agitator. After being contacted by the receiving device, it is deflected to one side, allowing the material to continue sliding onto the highest baffle plate. Then it continues to slide down the baffle plate to the next baffle plate. During the process, the material is gradually gathered in the center by the converging working surface of the baffle plates. After separating from the lowest baffle plate, it collides with the baffle to eliminate the horizontal velocity and then falls vertically to contact the centrifuge.

[0012] After the material comes into contact with the centrifugal blades, some of the material is thrown horizontally by the impact of the blades. After hitting the side wall of the distribution chamber or the centrifugal baffle, it continues to fall, detaches from the agitator, and falls randomly into various parts of the test chamber. The material that does not come into direct contact with the centrifugal blades falls along the blade support and falls into the area directly below the centrifuge under the convergence effect of the lower end of the innermost centrifugal baffle. This achieves the dispersion and distribution of the material to prevent the formation of a cone-shaped interface. At the same time, the random impact of the centrifugal blades makes the material mix evenly.

[0013] During this process, the vibration of the motor causes continuous vibration on all working surfaces in contact with the material, preventing smaller particles in the material from adhering and accumulating on the working surfaces. When the material includes fine, grayish particles, the equipment should be adjusted so that the centrifugal paddle support is eccentric relative to the motor to increase vibration and improve the effect of preventing adhesion and accumulation.

[0014] Preferably, the centrifugal impeller support is conical, with the tip pointing upwards towards the baffle. The centrifugal impeller is mounted on the outside of the conical surface, and a drive shaft is located in the center of the cone, which is connected to the motor for transmission. The conical centrifugal impeller support is most conducive to reducing the probability of material impacting the centrifugal impeller, and is suitable for applications with small material distribution chambers and specimen boxes, preventing the formation of a reverse conical interface where no material falls into the center of the specimen box. In applications with large material distribution chambers and specimen boxes, and where the centrifuge obstruction is very small compared to the material distribution area, a hemispherical centrifugal impeller support should be used to expand the material distribution area.

[0015] Furthermore, the centrifugal impeller support is a hollow conical shell machined from sheet metal, with a connecting rod installed inside the conical shell, which is connected to the drive shaft.

[0016] Furthermore, a suspension is installed inside the fabric chamber, with a circular suspension platform in the center. The motor is mounted below the suspension platform, and the centrifugal impeller support is mounted above it. The motor shaft passes through the suspension platform and connects to the drive shaft. The suspension platform has a circular groove or wheel groove to support the centrifugal impeller support, and a centrifugal baffle is mounted on the suspension. This design provides a relatively stable installation of the centrifugal impeller support and reduces the likelihood of failure. However, it cannot simultaneously implement an eccentric counterweight to improve vibration and prevent material adhesion and accumulation. When this design is adopted and there is a need to improve vibration, a separate eccentric counterweight should be installed on the motor shaft.

[0017] Preferably, the centrifugal baffle is made of corrugated plate, and its corrugated surface can constrain the impacting material, prevent it from sliding along the centrifugal baffle and causing secondary aggregation, and form a cone-shaped interface at the aggregation point.

[0018] This utility model provides a mixer for preparing test specimens of roadbed filling soil from construction waste. The mixer has the function of real-time uniform mixing and distribution, and does not cause material retention during the process. It is suitable for preparing test specimens with continuously changing material ratios. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the principle structure of a mixer used for preparing soil samples for roadbed filling of construction waste.

[0020] Appendix Figure 2 This is a schematic diagram of the centrifuge structure used in the preparation of soil samples for roadbed filling of construction waste.

[0021] In the diagram: 1. Feeder; 2. Drop pipe; 3. Material baffle; 4. Baffle; 5. Centrifuge; 501. Motor; 502. Centrifugal blade; 503. Blade support; 6. Centrifugal baffle; 7. Material distribution chamber; 701. Suspension; 702. Circular suspension platform; 8. Specimen box. Detailed Implementation

[0022] A mixer for preparing soil samples for roadbed filling of construction waste includes a receiving device 1, a discharge pipe 2, a material baffle 3, a baffle 4, a centrifuge 5, a centrifugal baffle 6, and a material distribution chamber 7.

[0023] The material discharge pipe 2 is a square tube with an expanded material distribution chamber 7 at the bottom. The receiving device 1 is installed at the top of the material discharge pipe 2. Multiple material deflectors 3 are installed inside the material discharge pipe 2. The material deflectors 3 are concave chutes or flat chutes with side baffles 4. The lower end of the working surface of the chutes converges inward to constrain the dispersed falling material, so that the material tends to concentrate inward during the falling process. The baffle 4 is installed at the bottom of the material deflector 3. The baffle 4 is located at the center of the connection between the material discharge pipe 2 and the material distribution chamber 7. The centrifuge 5 is installed inside the material distribution chamber 7, below the baffle 4. The centrifuge baffle 6 has at least two layers and is installed around the centrifuge 5 inside the material distribution chamber 7.

[0024] Centrifuge 5 includes motor 501, centrifugal blade 502 and blade support 503. Centrifugal blade 502 is connected to motor 501 for transmission through blade support 503. Centrifugal baffle 6 has its innermost lower end converging inward to form an inverted cone with an open top.

[0025] The blade support 503 is conical, with the tip pointing upwards toward the baffle 4. The centrifugal blades 502 are mounted on the outside of the conical surface, and a drive shaft is located in the center of the cone, which is connected to the motor 501 for transmission. The conical blade support 503 is most conducive to reducing the probability of material impacting the centrifugal blades 502, and is suitable for situations where the size of the material distribution chamber 7 and the specimen box 8 is small, preventing the formation of a reverse conical interface where no material falls in the center of the specimen box 8. In situations where the size of the material distribution chamber 7 and the specimen box 8 is large, and the centrifuge 5 covers a very small area compared to the material distribution range, a hemispherical blade support 503 should be used instead to expand the material distribution range.

[0026] The blade support 503 is a hollow conical shell machined from sheet metal. A connecting rod is installed inside the conical shell, and the connecting rod is connected to the drive shaft.

[0027] A suspension 701 is installed inside the fabric chamber 7. A circular suspension platform 702 is set in the center of the suspension 701. The motor 501 is installed below the suspension platform 702, and the blade support 503 is installed above the suspension platform 702. The shaft of the motor 501 passes through the suspension platform 702 and is connected to the drive shaft. The suspension platform 702 is provided with a circular sliding groove or wheel groove to support the blade support 503. The centrifugal baffle 6 is installed on the suspension 701. In this scheme, the installation of the blade support 503 is relatively stable and not prone to failure. However, it is not possible to simultaneously implement the scheme of setting eccentricity to improve vibration and prevent material adhesion and accumulation. When adopting this scheme and there is a need to improve vibration, an eccentric counterweight should be set separately on the shaft of the motor 501.

[0028] The centrifugal baffle 6 is made of corrugated plate. Its corrugated surface can constrain the impacting material, prevent it from sliding along the centrifugal baffle 6 and causing secondary aggregation, and form a cone-shaped interface at the aggregation point.

[0029] When the agitator is working, the motor 501 is started, which drives the centrifugal blade 502 to rotate continuously through the blade support 503. The vibration generated by the rotation of the motor 501, blade support 503 and centrifugal blade 502 is transmitted outward through the mounting structure of the motor 501, causing the discharge pipe 2, the distribution chamber 7, the receiving device 1, the baffle and the centrifugal baffle 6 to vibrate together.

[0030] The material is output and falls at a uniform speed from the feeding tool above the agitator. After being contacted by the receiving device 1, it is deflected to one side, allowing the material to continue sliding down to the highest baffle plate. Then it continues to slide down the baffle plate to the next baffle plate. During the process, the material is gradually gathered in the center by the converging working surface of the baffle plate. After separating from the lowest baffle plate, it collides with the baffle 4 to eliminate the horizontal velocity and then falls vertically to contact the centrifuge 5.

[0031] After the material comes into contact with the centrifugal blades 502, some of the material is thrown horizontally by the impact of the centrifugal blades 502. After hitting the side wall of the distribution chamber 7 or the centrifugal baffle 6, it continues to fall, detaches from the agitator and falls randomly into various places in the test chamber 8. The material that does not come into direct contact with the centrifugal blades 502 falls along the blade support 503. Under the convergence effect of the lower end of the innermost centrifugal baffle 6, it falls into the area directly below the centrifuge 5, thus achieving the dispersion and distribution of the material to prevent the formation of a cone-shaped interface. At the same time, the random impact of the centrifugal blades 502 makes the material mix evenly.

[0032] During this operation, the vibration of motor 501 causes continuous vibration on all working surfaces in contact with the material, preventing smaller particles in the material from adhering and accumulating on the working surfaces. When the material includes fine, grayish particles, the equipment should be adjusted so that the paddle support 503 is eccentric relative to motor 501 to increase vibration and improve the effect of preventing adhesion and accumulation.

Claims

1. A mixer for preparing soil specimens for roadbed filling using construction waste, characterized in that: It includes a feeder, a discharge pipe, a material baffle, a centrifuge, a centrifugal baffle, and a material distribution chamber; The material discharge pipe is a square tube with an expanded material distribution chamber at the bottom. A material receiver is installed at the top of the material discharge pipe. Multiple material baffles are installed inside the material discharge pipe to constrain the dispersed falling material, causing the material to tend to concentrate inward during the falling process. A baffle is installed at the bottom of the material baffle, located at the center of the connection between the material discharge pipe and the material distribution chamber. A centrifuge is installed inside the material distribution chamber, below the baffle. The centrifuge baffle has at least two layers and is installed around the centrifuge inside the material distribution chamber. The centrifuge includes a motor, centrifugal blades and blade support. The centrifugal blades are connected to the motor for transmission through the blade support. The innermost lower end of the centrifugal baffle converges inward to form an inverted cone with an open top.

2. The mixer for making a test specimen of construction waste subgrade fill soil according to claim 1, wherein The blade support is conical, with the tip pointing upwards toward the baffle. The centrifugal blades are mounted on the outside of the conical surface, and a drive shaft is set in the center of the cone, which is connected to the motor for transmission.

3. The mixer for preparing construction waste roadbed filling soil specimens as described in claim 2, characterized in that, The blade support is a hollow conical shell machined from sheet metal, and a connecting rod is installed inside the conical shell, which is connected to the drive shaft.

4. The mixer for preparing construction waste roadbed filling soil specimens as described in claim 2, characterized in that, A suspension is installed inside the fabric cavity. A circular suspension platform is set in the center of the suspension. The motor is installed below the suspension platform, and the blade support is installed above the suspension platform. The motor shaft passes through the suspension platform and is connected to the transmission shaft. A circular sliding groove or wheel groove is set on the suspension platform to support the centrifugal blade support. A centrifugal baffle is installed on the suspension.

5. The mixer for preparing construction waste roadbed filling soil specimens as described in claim 1, characterized in that, The centrifugal baffle is made of corrugated board.

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