A device for online uniform mixing of recycled sand

Abstract

This utility model relates to an online uniform mixing and dispersing device for recycled sand, including a mixing chamber, a storage tank, a feed pipe, a dispersing device, a flow guiding device, and a vibration device. Storage tanks are respectively located on the left and right sides above the mixing chamber. A dispersing device is located at the top of the mixing chamber, with one end extending into the mixing chamber. The mixing chamber also contains a flow guiding device and a vibration device. One end of the feed pipe is connected to the storage tank, and the other end extends into the mixing chamber. The dispersing device includes a dispersing unit, dispersing blades, a connecting rod, a support, and a motor. Several dispersing blades are distributed radially on the dispersing unit. The motor is vertically mounted in the middle of the top of the mixing chamber via the support. One end of the connecting rod is connected to the motor output shaft, and the other end is connected to the dispersing unit. This device achieves quantitative and uniform mixing and dispersion of new sand and recycled sand, which is beneficial for final uniform mixing, effectively removes lumps or large particles of impurities in the mixture, ensures the quality of the sand, and effectively solves the problem of recycled sand in the production of coated abrasives.

Description

Technical Field

[0001] This utility model relates to a mixing device, specifically a device for online uniform mixing and use of recycled sand, belonging to the field of coated abrasive production technology. Background Technology

[0002] In the production of coated abrasives, electrostatic sand application is a widely used process that enables abrasive particles to be evenly distributed on the fabric surface and maintain good uprightness. However, in actual production, due to various factors such as the characteristics of the abrasive particles themselves and uneven distribution of the electrostatic field, the sand application process cannot achieve 100% adsorption, thus inevitably producing residual sand that has been electrostatically struck, i.e., "recycled sand".

[0003] If not handled properly, the presence of recycled sand can have many adverse effects on the production of coated abrasives. On the one hand, the surface physical properties of some sand particles in the recycled sand are altered due to electrostatic discharge, making it difficult to mix evenly with new sand when re-coated. This results in uneven distribution of sand particles on the surface of the coated abrasive, thereby reducing product quality and precision, and affecting its grinding performance and service life. On the other hand, the accumulation of large amounts of recycled sand not only occupies production space but also increases production costs. Traditional handling methods, such as simply discarding the recycled sand, result in a huge waste of resources. Manual mixing is inefficient and cannot guarantee the uniformity of mixing, failing to meet the needs of large-scale, high-precision modern coated abrasive production. Using a stirring device for mixing is limited by the inability to control the mixing speed, and agglomerates and large particles cannot be removed during the mixing process, resulting in insufficient uniformity and quality of mixing.

[0004] Therefore, it is urgent to develop a device that can achieve online uniform mixing of recycled sand. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an online uniform mixing device for recycled sand. This device realizes quantitative and uniform mixing and dispersion of new sand and recycled sand, which is conducive to the final uniform mixing, effectively removes lumps or large particles of impurities in the mixture, ensures the quality of sand, and effectively solves the problem of recycled sand in the production of coated abrasives.

[0006] To solve the above technical problems, this utility model provides an online uniform mixing device for recycled sand, including a mixing bin, a storage bin, a feed pipe, a dispersing device, a flow guiding device, and a vibration device. Storage bins are respectively provided on the left and right sides above the mixing bin for storing new sand and recycled sand. A dispersing device is provided at the top of the mixing bin, with one end extending into the mixing bin. A flow guiding device and a vibration device are also provided inside the mixing bin. The vibration device is located at the bottom of the mixing bin, and the flow guiding device is located between the dispersing device and the vibration device. One end of the feed pipe is connected to the storage bin, and the other end extends into the mixing bin, located above the dispersing device.

[0007] The dispersion device includes a dispersion unit, dispersion blades, a connecting rod, a support, and a motor. The dispersion unit is a hollow cone with several dispersion blades distributed on it. One end of each dispersion blade is connected and they are radially distributed on the surface of the dispersion unit. The motor is vertically mounted in the middle of the upper part of the mixing chamber via the support. One end of the connecting rod is connected to the output shaft of the motor, and the other end is connected to the dispersion unit, so that the dispersion unit is suspended in the upper part of the mixing chamber.

[0008] The flow guiding device is a flow guiding plate installed on the inner wall of the mixing chamber, and the flow guiding plate has a flow guiding hole in the middle.

[0009] The vibrating device is a vibrating screen.

[0010] The further defined technical solution of this utility model is:

[0011] Furthermore, in the aforementioned online uniform mixing and utilization device for recycled sand, the storage bins include a new sand storage bin and a recycled sand storage bin.

[0012] In terms of technical benefits, this utility model uses a new sand storage bin and a recycled sand storage bin, which can store the corresponding materials, facilitate mixing control, make operation convenient, save time and effort, and improve efficiency.

[0013] In the aforementioned online uniform mixing device for recycled sand, the guide plate has an inverted frustum structure, and the guide hole is located directly above the vibrating device. The size of the guide hole is smaller than the surface size of the vibrating device, ensuring that all the material falls into the vibrating device and is effectively vibrated to enhance uniform mixing.

[0014] Technically, the guide plate has an inverted frustum structure, which facilitates the smooth flow of scattered materials into the vibrating device for the next step of operation, thereby improving work efficiency.

[0015] In the aforementioned online uniform mixing device for sand return, the dispersing blades are right-angled trapezoidal structures, with one side of the inclined surface of the dispersing blades connected, and the right-angled side of the dispersing blades evenly distributed on the dispersing unit. The included angle between two adjacent dispersing blades is 10°-90°, preferably 20°-70°, and optimally 30°-60°. The height of the dispersing blades is controlled at 10-50mm.

[0016] Technically, this invention strictly controls the spacing of the dispersing blades, controls the distribution density to ensure effective material dispersion, and controls the height and density of the dispersing blades to ensure uniform dispersion under different abrasive particle sizes and different abrasive feed rates during operation.

[0017] In the aforementioned online uniform mixing and utilization device for recycled sand, one end of the feed pipe on the storage tank that extends into the mixing chamber is located in the upper middle part of the dispersion unit.

[0018] Technically, this invention adjusts the outlet of the feed pipe to the upper middle part of the dispersion unit, located at one-third of the length of the cone's side side. This helps ensure that the material falls onto the dispersion unit, facilitating its rapid dispersion and ensuring normal operation. If the abrasive flow rate is too low, some abrasive will slide directly along the edge of the dispersion unit, resulting in uneven dispersion.

[0019] In the aforementioned online uniform mixing and utilization device for recycled sand, the vibrating screen is a three-dimensional vibrating screen.

[0020] In the aforementioned online uniform mixing and utilization device for recycled sand, the outlet of the vibrating screen is connected to the sand hopper for temporary storage via a pipeline.

[0021] Technically, after the uniformly mixed sand is discharged from the device, it is transported to the sand hopper for temporary storage through a pipeline. The sand hopper is precisely connected to the sand planting station on the coated abrasive production line, realizing the online real-time use of the mixture of recycled sand and new sand.

[0022] The aforementioned online uniform mixing and utilization device for recycled sand also includes a control system. The control system includes an automatic control valve, a sensing element, and a controller unit. The controller unit is electrically connected to the automatic control valve. An automatic control valve is installed at the outlet of the storage tank. A sensing element is installed on the automatic control valve. The sensing element is an existing component that can realize online weighing: the valve is opened and closed by changing the weighing parameters.

[0023] Automatic control valves, sensing elements, motors, and vibrating screens are connected to the controller unit via wiring.

[0024] The beneficial effects of this utility model are:

[0025] This invention eliminates the need for manual stirring and conventional stirring devices, thus avoiding uneven mixing. For sand materials with lumps or large impurities that affect the quality, a dispersing device can be used to break up and premix the sand. The scattered sand falls into a vibrating screen with the guide plate and is mixed again under the action of the vibrating screen, improving the uniformity of mixing. At the same time, during the mixing process, any lumps or large particles that may exist can be screened out, ensuring the quality of the final mixed sand. The structure is simple and easy to use.

[0026] The dispersion unit in this invention has a conical structure and dispersion blades with different spacings are provided on the dispersion unit. When the dispersion device with this structure is in operation, it can drive the new sand and the returned sand to make a compound motion. On the one hand, it pushes the material to move slowly along the axis of the device; on the other hand, it drives the material to make a circular motion around the central axis. This compound motion mode greatly increases the contact opportunity and mixing probability of the returned sand and the new sand.

[0027] This utility model provides a flow guide device below the dispersing device, which is used to reasonably disperse the pre-mixed material so that the material enters the next processing stage more evenly. The shape of the flow guide device is designed to adapt to the discharge characteristics of the dispersing device and the feeding requirements of the subsequent three-dimensional vibrating screen, ensuring the normal operation of the work.

[0028] This invention employs a vibrating screen for secondary mixing. Through high-frequency vibration, it further promotes the uniformity of mixing between new and recycled sand, while also screening out any lumps or large particles that may be present, ensuring the quality of the final mixed sand. The vibration frequency and amplitude of the vibrating screen can be adjusted according to actual production needs through an intelligent control system.

[0029] This invention, in conjunction with a control system, allows the entire device to be uniformly managed by an existing intelligent control system. The controller unit in this system integrates data acquisition, analysis, and precise control functions. Through automatic control valves or sensors distributed at key locations within the device, it collects key data in real time, such as feed flow rate, the ratio of new to returned sand, and the operating parameters of the three-dimensional vibrating screen. This data is then analyzed in depth. Based on preset mixing parameters and the production process requirements of the coated abrasives, the intelligent control system automatically and precisely adjusts equipment operating parameters such as the opening degree of the automatic control valves, the motor speed, and the vibration parameters of the three-dimensional vibrating screen. This achieves fully automated operation of the device, significantly improving production efficiency while ensuring high stability of the mixing quality. Furthermore, the intelligent control system also features remote monitoring capabilities. Operators can view the device's operating status, various parameters, and historical data records anytime, anywhere via mobile phones, computers, and other terminal devices, facilitating timely problem detection and remote control, further enhancing the convenience and efficiency of production management. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the online uniform mixing and utilization device for recycled sand according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A partial structural schematic diagram of the medium dispersion device;

[0032] Figure 3 for Figure 2 Top view;

[0033] In the diagram: 1-mixing bin, 2-feed pipe, 3-dispersion unit, 4-dispersion blades, 5-connecting rod, 6-support, 7-motor, 8-guide plate, 9-vibrating screen, 10-new sand storage bin, 11-return sand storage bin. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them; the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0035] This embodiment provides a device for online uniform mixing of recycled sand, the structure of which is as follows: Figure 1-3 As shown, the system includes a mixing chamber 1, a storage tank, a feed pipe 2, a dispersing device, a flow guiding device, and a three-dimensional vibrating screen. A new sand storage tank 10 and a returned sand storage tank 11 are respectively located on the left and right sides above the mixing chamber 1 for storing new and returned sand. A dispersing device is located at the top of the mixing chamber 1, with one end extending into the mixing chamber 1. A flow guiding device and a vibrating device are also located inside the mixing chamber 1. The vibrating device is located at the bottom of the mixing chamber 1, and the flow guiding device is located between the dispersing device and the vibrating device. One end of the feed pipe 2 is connected to the storage tank, and the other end extends into the mixing chamber 1, located at one-third of the length of the upper side of the dispersing unit 3, facilitating thorough mixing.

[0036] The dispersion device includes a dispersion unit 3, dispersion blades 4, a connecting rod 5, a support 6, and a motor 7. The dispersion unit 3 is a hollow cone with several dispersion blades 4 distributed on it. The dispersion blades 4 are connected at one end and radially distributed on the surface of the dispersion unit 3. The dispersion blades 4 are right-angled trapezoidal structures with one side of the inclined surface connected. The right-angled side of the dispersion blades 4 is evenly distributed on the dispersion unit 3. The right-angled sides of two adjacent dispersion blades 4 are separated by a numerical range. The height of the dispersion blades 4 is controlled within a numerical range. The motor 7 is vertically mounted in the middle of the upper part of the mixing chamber 1 through the support 6. One end of the connecting rod 5 is connected to the output shaft of the motor 7, and the other end is connected to the dispersion unit 3, so that the dispersion unit 3 is suspended in the upper part of the mixing chamber 1.

[0037] The flow guiding device is a flow guiding plate 8 installed on the inner wall of the mixing chamber 1. The flow guiding plate 8 has a flow guiding hole in the middle. The flow guiding plate 8 has an inverted frustum structure. The flow guiding hole is located directly above the three-dimensional vibrating screen. The size of the flow guiding hole is smaller than the surface size of the vibrating device, ensuring that all the material falls into the vibrating device and is effectively vibrated to enhance the uniform mixing.

[0038] The outlet of the three-dimensional vibrating screen is connected to a sand hopper for temporary storage via a pipeline.

[0039] The above-mentioned mixing device is equipped with an existing control system, which includes an automatic control valve, a sensing element, and a controller unit. An automatic control valve is installed at the outlet of the storage tank, and a sensing element is installed on the automatic control valve. The automatic control valve, the sensing element, the motor, and the vibrating screen are respectively connected to the controller unit through lines, and the automatic control of the mixing device is realized according to the existing functions of the existing control system.

[0040] In this embodiment, the screen size and gap of the three-dimensional vibrating screen are matched with the abrasive to ensure that normal abrasive will not be directly leaked to the bottom of the screen under the premise of vibration mixing. At the same time, agglomerated and large particle impurities are filtered out. The screen effectively intercepts coarse particles and abrasive with adhesive. If the screen gap is too large, it will not be able to disperse and intercept coarse particles again. If it is too small, the sand will not be able to pass through in time and will not meet the production requirements. Therefore, it is necessary to ensure that the gap matches the abrasive. The specific data of abrasive and screen are shown in Table 1.

[0041] Table 1 Abrasive Particle Size and Screen Gap Dimensions

[0042] Abrasive particle size during operation Corresponding screen gap P360 and fine 105um P240-P320 130um P220 154um P180 180um P150 220um P120 240um P100 360um P80 420um P60 600um P40-P50 800um P36 1090um P24-P30 1686um

[0043] In practice:

[0044] (1) Feeding stage

[0045] Before the production of coated abrasives, the operators accurately set the feeding ratio of recycled sand and new sand in the intelligent control system according to the product quality standards and production process requirements. After the device is turned on, the new sand and recycled sand pass through their respective new sand storage tanks and recycled sand storage tanks. Under the instructions of the intelligent control system, the automatic control valve precisely adjusts the material feeding speed so that the recycled sand and new sand strictly follow the set ratio and enter the mixing chamber smoothly through the feeding pipe. During the feeding process, the operators can check the feeding flow rate in real time through the operation interface of the intelligent control system so as to promptly detect and deal with any abnormalities that may occur.

[0046] (2) Mixing stage

[0047] The returned and new sand entering the mixing chamber first reaches the dispersion unit. The dispersion unit begins operation; under the weight of the material, the outer dispersion blades cause the material to move slowly axially, while the blades themselves drive the material in a circular motion around the central axis, ensuring thorough contact and mixing of the two types of sand. The material, initially mixed by the spiral structure, enters the guide zone. Under the action of the guide plates, the material is evenly dispersed and falls into the vibrating screen, then into the three-dimensional vibrating screen. The three-dimensional vibrating screen operates according to a preset vibration frequency and amplitude, further mixing and screening the material. During this process, the intelligent control system can monitor parameters such as the material state in the mixing area in real time using sensors to ensure a suitable mixing environment. Operators can adjust the speed of the spiral structure and the operating parameters of the three-dimensional vibrating screen through the intelligent control system based on the actual mixing effect to achieve the best mixing result.

[0048] (3) Discharge stage

[0049] After being mixed and screened by a three-dimensional vibrating screen, the uniform sand is transported to the sand hopper through a pipeline. The sand hopper is precisely connected to the sand planting station of the coated abrasive production line to realize the online real-time use of the sand. If any abnormality occurs in the sand conveying process, such as blockage or unstable flow, sensors installed on the pipeline and related parts will promptly feed the signal back to the intelligent control system. The intelligent control system will react quickly, automatically adjust the operating parameters of the relevant equipment, or issue an alarm to prompt the operator to handle the situation, so as to ensure the continuity and stability of the entire production process.

[0050] (4) Equipment maintenance

[0051] Regular comprehensive maintenance of the equipment is crucial for ensuring its stable and efficient operation. Maintenance personnel must check for blockages or wear in the feed and discharge channels, promptly clearing any accumulated material from the pipes. They must carefully inspect the operating status of key components such as automatic control valves, dispersion structures, and the three-dimensional vibrating screen, replacing worn parts in a timely manner. Simultaneously, they should upgrade the software and back up the data of the intelligent control system to ensure stable system operation. Maintenance personnel can also analyze the historical data records of the intelligent control system to predict potential faults and perform preventative maintenance, ensuring the equipment is always in good working order.

[0052] This utility model provides an online uniform mixing and utilization device for recycled sand, which can effectively overcome the problem of recycled sand treatment in coated abrasive production, realize the efficient mixing and online utilization of recycled sand and new sand, significantly improve production efficiency, ensure product quality, and has broad application prospects and huge market value.

[0053] In addition to the embodiments described above, this utility model may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A device for online uniform mixing and use of recycled sand, characterized in that: The system includes a mixing silo (1), a storage hopper, a feed pipe (2), a dispersing device, a flow guiding device, and a vibration device. The storage hopper is located on the left and right sides above the mixing silo (1) for storing new sand and recycled sand, respectively. The dispersing device is located at the top of the mixing silo (1), with one end of the dispersing device extending into the mixing silo (1). The mixing silo (1) is also equipped with a flow guiding device and a vibration device. The vibration device is located at the bottom of the mixing silo (1), and the flow guiding device is located between the dispersing device and the vibration device. One end of the feed pipe (2) is connected to the storage hopper, and the other end extends into the mixing silo (1) and is located above the dispersing device. The dispersing device includes a dispersing unit (3), dispersing blades (4), a connecting rod (5), a bracket (6), and a motor (7). The dispersing unit (3) is a hollow cone. Several dispersing blades (4) are distributed on the dispersing unit (3). One end of the dispersing blades (4) is connected and radially distributed on the surface of the dispersing unit (3). The motor (7) is vertically installed in the middle of the upper part of the mixing chamber (1) through the bracket (6). One end of the connecting rod (5) is connected to the output shaft of the motor (7), and the other end is connected to the dispersing unit (3), so that the dispersing unit (3) is suspended in the upper part of the mixing chamber (1). The flow guiding device is a flow guiding plate (8) installed on the inner wall of the mixing chamber (1), and the flow guiding plate (8) has a flow guiding hole in the middle. The vibrating device is a vibrating screen (9).

2. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The storage bins include a new sand storage bin (10) and a recycled sand storage bin (11).

3. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The guide plate (8) has an inverted frustum structure, and the guide hole is located directly above the vibration device.

4. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The dispersing blade (4) is a right-angled trapezoidal structure. The inclined side of the dispersing blade (4) is connected. The right-angled side of the dispersing blade (4) is evenly distributed on the dispersing unit (3). The included angle between two adjacent dispersing blades (4) is 10°-90°. The height of the dispersing blade (4) is controlled between 10-50mm.

5. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The feed pipe (2) on the storage tank extends into the mixing chamber (1) at one end, which is located in the upper middle part of the dispersion unit (3).

6. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The vibrating screen (9) is a three-dimensional vibrating screen.

7. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: The outlet of the vibrating screen (9) is connected to the sand hopper for temporary storage via a pipeline.

8. The online uniform mixing and utilization device for recycled sand according to claim 1, characterized in that: It also includes a control system, which includes an automatic control valve, a sensing element and a controller unit. The automatic control valve is provided at the outlet of the storage tank, and the sensing element is provided on the automatic control valve. The automatic control valve, sensing element, motor and vibrating screen are respectively connected to the controller unit via lines.

Images