Sand adding device with cyclone purging system
By introducing a cyclone purging system into the sand adding device, and utilizing purging air ports at equal intervals and high-pressure airflow controlled by a solenoid valve, the problem of incomplete cleaning of the inner wall of the sand adding tube was solved, achieving efficient and reliable cleaning results and improving the purity and quality of the quartz crucible.
Patent Information
- Application Number
- CN202511749445.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-03-03
AI Technical Summary
Existing sand-adding devices are ineffective at removing sand particles adhering to the inner wall of the sand-adding pipe, especially in the deep parts of the pipe where cleaning is incomplete. Furthermore, manual cleaning yields inconsistent results, affecting the purity and quality of the quartz crucible.
Design a sand-adding device with a cyclone purging system. The device uses circumferentially spaced purging ports to form a high-speed rotating airflow through high-pressure airflow to remove sand particles adhering to the inner wall of the sand-adding pipe. The airflow time is controlled by a solenoid valve to reduce manual intervention.
It improves the cleaning effect of the inner wall of the sand adding pipe, ensures the purity and quality of the quartz crucible, reduces the dependence on manual cleaning, and improves the utilization rate of the gas source and the cleaning power.
Smart Images
Figure CN121590944A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mechanical technology, specifically to a sand-adding device. Background Technology
[0002] Currently, in the production of quartz crucibles and the sand-adding molding process, multiple layers of quartz sand are typically added, including an inner layer, a middle layer, an outer layer, and a release layer. Each layer uses a different type of quartz sand to meet the process quality requirements. Different types of quartz sand are added to the mold in sequence during the molding process.
[0003] In the semiconductor crystal growth process, the quartz crucible, as a container for silicon material, comes into direct contact with the high-temperature molten silicon solution. In the high-temperature environment, if the purity of the sand in the inner layer of the crucible is insufficient, other impurity elements will precipitate out and enter the silicon solution, resulting in poor quality of the grown crystal rod.
[0004] Currently, in crucible manufacturing, different types of sand are added to the mold through the same sand-feeding pipe during the material feeding and molding process. As the quartz sand flows through the pipe, some sand particles are adsorbed onto the inner wall. If the outer layer sand has a high aluminum content, or the release sand is not pure enough, it adheres to the inner wall of the pipe and, if not cleaned promptly, mixes with the inner layer sand, resulting in substandard purity and poor-quality crucibles. To avoid sand mixing, after adding one type of sand, the adhering sand particles on the inner wall of the pipe need to be manually removed.
[0005] Due to the pipe's bends, manual cleaning was performed using an air gun to blow air into the pipe from the outlet. This method was effective at cleaning the sand-addition pipe outlet, but less effective at cleaning deeper sections of the pipe, resulting in incomplete cleaning. Furthermore, due to the manual nature of the cleaning, the cleaning results varied depending on the personnel involved.
[0006] Given the above circumstances, in order to ensure the quality of the crucibles produced, a better method of cleaning the sand-filled tube is needed to replace the current manual cleaning. Summary of the Invention
[0007] To address the problems existing in the prior art, the present invention provides a sand adding device with a cyclone purging system to solve at least one of the above technical problems.
[0008] To achieve the above objectives, the present invention provides a sand feeding device with a cyclone purging system, comprising a hopper, a valve, and a sand feeding pipe connected sequentially from top to bottom. The sand feeding pipe is characterized in that a circumferentially spaced purging air port is installed at the axial end near the valve. The purging air port is connected to an air distribution block through an air pipe. The air distribution block is connected to an air supply mechanism through a solenoid valve.
[0009] The purge air inlet is oriented with its airflow directed downwards from the outside in.
[0010] The present invention adds a purge port to facilitate the introduction of high-pressure gas for purging.
[0011] More preferably, the purge air port is provided with three.
[0012] Further preferably, the interval angle between the three purge ports is 120°.
[0013] More preferably, the angle between the guiding direction of the purge air port and the central axis of the sand adding pipe is 45°.
[0014] More preferably, the angle between the axial projection of the guide direction of the purge air port and the radial direction of the sand adding pipe is 45°.
[0015] More preferably, the angle between the guiding direction of the purge air port and the central axis of the sand adding pipe is 45°;
[0016] The axial projection of the purging air port's flow direction forms a 45° angle with the radial direction of the sand-adding pipe.
[0017] More preferably, the gas distribution block includes a block-shaped body, on which an air inlet for connecting to the gas supply mechanism and a sub-air outlet for connecting to the air pipe are provided, and the number of the sub-air outlets matches the number of the purge air inlets.
[0018] The air inlet is connected to the sub-air outlet.
[0019] More preferably, the sand-adding pipe includes a first longitudinal guide section, an inclined guide section, and a second longitudinal guide section connected sequentially from top to bottom;
[0020] The purge air port is located in the first longitudinal guide section;
[0021] The second longitudinal guide section is the sand outlet of the sand adding pipe.
[0022] In a further preferred embodiment, the valve is opened to perform the sand adding operation; after the sand adding is completed, the valve is closed, the solenoid valve is opened, and the gas supply mechanism introduces the gas into the sand adding pipe through the purging air port. In the sand adding pipe, a high-speed rotating airflow is formed to purge the sand particles attached to the inner wall of the sand adding pipe.
[0023] After the set purging time, close the solenoid valve to end the purging process.
[0024] Compared with the prior art, the beneficial effects of the present invention are:
[0025] 1) High-speed rotating airflow sweeps along the inner wall of the pipe, greatly improving the removal effect of adhering sand particles.
[0026] 2) The high-speed rotating airflow prevents the airflow from flowing out directly. Direct flow would cause air pressure loss and failure to purge the inner wall. Therefore, this structure improves the purging force and utilization rate of the air source.
[0027] 3) The compressed air used for purging is controlled by a solenoid valve. The conduction time of the solenoid valve can be adjusted according to the purging effect. Solenoid valve control of purging reduces the dependence on manual labor and improves the purging effect. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of a specific embodiment 1 of the present invention;
[0029] Figure 2 This is a schematic diagram of the internal structure of the sand-adding pipe in a specific embodiment 1 of the present invention.
[0030] In the diagram: 1 is the hopper, 2 is the valve, 3 is the purging air port, 4 is the sand adding pipe, 5 is the sand outlet, 6 is the solenoid valve, 7 is the air distribution block, and 8 is the air pipe. Detailed Implementation
[0031] The present invention will now be further described with reference to the accompanying drawings.
[0032] See Figures 1 to 2 Specific Embodiment 1: A sand-adding device with a cyclone purging system includes a hopper 1, a valve 2, and a sand-adding pipe 4 connected sequentially from top to bottom. The sand-adding pipe 4 has circumferentially spaced purging air ports 3 installed near the axial end of the valve 2. Each purging air port 3 is connected to a gas distribution block 7 via an air pipe 8, and the gas distribution block 7 is connected to a gas supply mechanism via a solenoid valve 6. The airflow direction of the purging air ports 3 is inclined downwards from the outside to the inside. This invention, by adding purging air ports 3, facilitates the introduction of high-pressure gas for purging.
[0033] The purge air port 3 is provided in three parts. The three purge air ports 3 are spaced 120° apart.
[0034] The angle between the flow direction of the purge air port 3 and the central axis of the sand adding pipe 4 is 45°; the angle between the axial projection of the flow direction of the purge air port 3 and the radial direction of the sand adding pipe 4 is 45°.
[0035] The sand-adding pipe 4 includes a first longitudinal guide section, an inclined guide section, and a second longitudinal guide section connected sequentially from top to bottom; the purging air port 3 is located in the first longitudinal guide section, and the second longitudinal guide section is the sand outlet 5 of the sand-adding pipe 4.
[0036] The gas distribution block 7 includes a block-shaped body, on which an air inlet for connecting to the gas supply mechanism and a sub-air outlet for connecting to the air pipe 8 are provided. The number of sub-air outlets matches the number of purge air ports 3. The air inlet and the sub-air outlet are connected and interconnected.
[0037] Open valve 2 to perform sand addition; after sand addition is completed, close valve 2 and open solenoid valve 6. The gas supply mechanism introduces gas into sand addition pipe 4 through purge port 3. In sand addition pipe 4, a high-speed rotating airflow is formed to purge the sand particles attached to the inner wall of sand addition pipe 4; after the purge is set for a time, close solenoid valve 6 to end the purge.
[0038] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A sand-adding device with a cyclone blowing system, comprising a hopper, a valve, and a sand-adding pipe connected sequentially from top to bottom, characterized in that, The sand-adding pipe is equipped with purge air ports arranged at equal circumferential angles at the axial end near the valve. The purge air ports are connected to a gas distribution block through an air pipe. The gas distribution block is connected to the gas supply mechanism through a solenoid valve. The purge air inlet is oriented with its airflow directed downwards from the outside in.
2. The sand-adding device with a cyclone blowing system according to claim 1, characterized in that: There are three purge air ports.
3. The sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The three purge ports are spaced 120° apart.
4. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The angle between the flow direction of the purge air inlet and the central axis of the sand adding pipe is 45°.
5. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The axial projection of the purging air port's flow direction forms a 45° angle with the radial direction of the sand-adding pipe.
6. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The angle between the flow direction of the purge air port and the central axis of the sand adding pipe is 45°. The axial projection of the purging air port's flow direction forms a 45° angle with the radial direction of the sand-adding pipe.
7. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The gas distribution block includes a block-shaped body, on which an air inlet for connecting to the gas supply mechanism and a sub-air outlet for connecting to the gas pipe are provided, and the number of the sub-air outlets matches the number of the purge air inlets. The air inlet is connected to the sub-air outlet.
8. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: The sand-addition pipe includes a first longitudinal guide section, an inclined guide section, and a second longitudinal guide section connected sequentially from top to bottom; The purge air port is located in the first longitudinal guide section; The second longitudinal guide section is the sand outlet of the sand adding pipe.
9. A sand-adding device with a cyclone blowing system according to claim 1, characterized in that: Open the valve to perform the sand adding operation; after the sand adding is completed, close the valve, open the solenoid valve, and the air supply mechanism will introduce the gas into the sand adding pipe through the purging air port. In the sand adding pipe, a high-speed rotating airflow is formed to purge the sand particles attached to the inner wall of the sand adding pipe. After the set purging time, close the solenoid valve to end the purging process.