Dust-free and environmentally friendly powder mixing device

Abstract

The application discloses a dust-free and environment-friendly powder mixing device and belongs to the dust-free powder mixing field.The device comprises a mixing device, a mixing cavity is arranged in the mixing device, a stirring mechanism for mixing internal powder is arranged on the mixing device, a negative pressure dust collecting box is arranged above the mixing device, a dust collecting negative pressure cavity in communication with the mixing cavity and a first filtering cavity in lateral communication with the outside are arranged in the negative pressure dust collecting box, and a negative pressure air extraction port is arranged on one side of the dust collecting negative pressure cavity.The negative pressure dust collecting box is arranged above the mixing device, the dust collecting negative pressure cavity and the first filtering cavity are arranged in the negative pressure dust collecting box, the dust collecting negative pressure cavity maintains negative pressure through the negative pressure air extraction port, air in the mixing cavity passes through the filter cartridge to achieve dust retention, the first filtering cavity supplies air to the dust collecting negative pressure cavity through the upper filter plate to stabilize the negative pressure and block the invasion of external dust, and the problem that external dust is sucked into from other weak gaps due to excessively high negative pressure is avoided.

Description

Technical Field

[0001] This invention relates to the field of dust-free powder mixing technology, specifically to a dust-free and environmentally friendly powder mixing device. Background Technology

[0002] Powder mixing equipment is an industrial device that achieves uniform mixing of powders through mechanical motion. It is widely used in pharmaceuticals, chemicals, food and other fields.

[0003] During operation, powder mixing equipment experiences internal temperature rises due to friction between materials and mechanical stirring, leading to gas expansion and increased pressure. If left uncontrolled, the high-pressure air carrying dust can leak out through sealed gaps, causing environmental pollution and material loss. Therefore, current technology typically incorporates a negative pressure suction device inside the equipment to maintain the internal pressure below atmospheric pressure, effectively preventing dust leakage.

[0004] However, the above-mentioned dust-free powder mixing still has the following defects: outside air can easily be drawn into the chamber through weak links such as the feed inlet and sealing shaft, carrying external dust, moisture and impurities into the material, resulting in a decrease in the purity of the mixture and even affecting the product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a dust-free and environmentally friendly powder mixing device to solve the problem in the prior art where outside air can be easily drawn into the chamber through weak links such as the feed inlet and sealing shaft, resulting in a decrease in the purity of the mixture.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A dust-free and environmentally friendly powder mixing device includes a mixing unit with a mixing chamber inside. The mixing unit is equipped with a stirring mechanism for mixing the powder materials inside. A negative pressure dust collection box is located above the mixing unit. The negative pressure dust collection box contains a dust collection negative pressure chamber communicating with the mixing chamber and a first filter chamber communicating laterally with the outside. A negative pressure exhaust port is located on one side of the dust collection negative pressure chamber to maintain a negative pressure state inside the chamber. A filter cylinder is located between the dust collection negative pressure chamber and the mixing chamber. An airflow isolation component is located between the first filter chamber and the dust collection negative pressure chamber. The airflow isolation component includes a partition plate with an air supply hole. A first filter plate support is located inside the first filter chamber, and an upper filter plate is mounted on the first filter plate support. A coarse replacement box is located near the air supply hole in the dust collection negative pressure chamber. A linkage component for moving the coarse replacement box is located on the first filter plate support.

[0007] Preferably, the airflow isolation assembly includes a front isolation plate and a base plate fixedly connected to the first filter chamber. The front isolation plate and the base plate are distributed front to back. Rotary rollers are rotatably arranged at both ends of the base plate. Sealing strips are fitted on the base plate and the rotary rollers. The sealing strips are slidably fitted with the base plate. Alignment openings are provided on the base plate. The sealing strips on the upper side of the base plate have two sets of upper through-holes. One set of upper through-holes communicates with the inside of the coarse replacement box. The sealing strips on the lower side of the base plate have two sets of lower through-holes.

[0008] Preferably, a second filter chamber is provided between the first filter chamber and the dust collection negative pressure chamber; a second filter plate support is slidably fitted inside the second filter chamber, a fine replacement box is provided on the rear side of the second filter chamber, and a lower filter plate is installed on the second filter plate support; a linkage component for driving the fine replacement box to move is provided on the second filter plate support; two sets of airflow isolation components are provided, respectively located between the first filter chamber and the second filter chamber, and between the dust collection negative pressure chamber and the second filter chamber.

[0009] Preferably, the linkage assembly includes a rod fixedly disposed on the rear side of the first filter plate support and the second filter plate support. Both the coarse replacement box and the fine replacement box have a positioning cavity and a sealing cavity. The positioning cavity is slidably aligned with the rod, and a protrusion is provided at the end of the rod. A fitting component is slidably fitted inside the sealing cavity. The fitting component includes a concave block that engages with the protrusion. A pressure block is fixedly disposed at the bottom of the concave block. The pressure block is slidably fitted with the sealing cavity. A ball bearing is disposed at the bottom of the pressure block. When the ball bearing moves above the alignment opening, the fitting component falls, releasing the lock between the concave block and the protrusion.

[0010] In this embodiment, the airflow isolation component is designed as a front isolation plate that mates with the base plate. The base plate has moving rollers at both ends that slide in conjunction with a sealing strip. The sealing strip has upper and lower through-holes. The linkage component engages with the positioning cavity of the coarse replacement box via a rod. The movement is divided into two stages: in the first stage, the rod drives the mating component via a protrusion, causing the coarse replacement box to move synchronously. In the second stage, the mating component falls into the alignment opening and is unlocked, achieving separation. When the pull-out seat is pulled, the sealing strip moves, allowing the through-hole and alignment openings to connect. The filtered air from the coarse replacement box enters the dust collection negative pressure cavity through the through-hole. This solves the problem of the large size and difficulty in sealing the coarse replacement box, ensuring accurate positioning, reliable sealing, and uninterrupted filtration when replacing the filter plate.

[0011] Preferably, the first filter plate support has a lateral air inlet hole that communicates with the outside.

[0012] Preferably, a negative pressure monitoring sensor is fixedly installed on the dust collection negative pressure chamber to detect the internal air pressure.

[0013] Preferably, an upper sealing cover is provided above the mixing chamber, the upper sealing cover is sealed to the mixing chamber, and a material conveying port is provided on the upper sealing cover.

[0014] Preferably, a discharge port is provided at the bottom of the mixing chamber, and a pneumatic unloading gate is provided on the discharge port.

[0015] Preferably, the stirring mechanism includes a mixing motor disposed on one side of the mixing device, and a stirring blade assembly is disposed inside the mixing chamber, with the output end of the mixing motor engaging with the stirring blade assembly in a transmission manner.

[0016] Preferably, the negative pressure extraction port is connected to an external negative pressure pump.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: This invention provides a negative pressure dust collection box above the mixing device. The box is divided into a dust collection negative pressure chamber that communicates with the mixing chamber and a first filter chamber that communicates with the outside. The dust collection negative pressure chamber maintains negative pressure through a negative pressure exhaust port, allowing air in the mixing chamber to pass through the filter cylinder to trap dust. The first filter chamber replenishes air to the dust collection negative pressure chamber through an upper filter plate to stabilize the negative pressure and prevent external dust from entering. This avoids excessive negative pressure that could cause external dust to be sucked in from other weak gaps and contaminate the powder.

[0018] The first filter plate holder can be pulled out to replace the upper filter plate. The rear coarse replacement box automatically moves above the air inlet hole when the pull-out seat moves away from the air inlet hole to replace the filter, ensuring uninterrupted filtration during replacement. The negative pressure monitoring sensor monitors the air pressure in real time to guide the replacement time, achieving dust-free and environmentally friendly mixing as a whole. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the longitudinal section structure of the present invention; Figure 3 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 4 This is a schematic diagram of the coarse replacement box structure according to the first embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 6 This is a schematic diagram of the airflow isolation component structure of the present invention; Figure 7 This is a schematic diagram of the structure of the third embodiment of the present invention; Figure 8 This is a schematic diagram of the structure when the upper plate of the present invention is removed; Figure 9 This is a schematic diagram of the structure when the lower plate of the present invention is removed; Figure 10 This is a schematic diagram of the longitudinal section structure of the third embodiment of the present invention; Figure 11This is a schematic diagram of the linkage component structure of the present invention; Figure 12 yes Figure 11 A magnified schematic diagram of the structure at point A in the middle.

[0020] Explanation of reference numerals in the attached figures: 1. Mixing device; 101. Mixing chamber; 102. Discharge port; 103. Pneumatic discharge gate; 104. Upper sealing cover; 105. Conveying port; 2. Stirring mechanism; 201. Mixing motor; 202. Stirring blade assembly; 3. Negative pressure dust collection box; 301. Dust collection negative pressure chamber; 302. First filter chamber; 3021. First filter plate support; 3022. Coarse replacement box; 3023. Upper filter plate; 3024. Side air inlet hole; 303. Second filter chamber; 3031. Second filter plate support; 3032. Fine replacement box; 3033 1. Lower filter plate; 4. Negative pressure monitoring sensor; 5. Airflow isolation assembly; 501. Front isolation plate; 502. Base plate; 5021. Alignment port; 503. Moving roller; 504. Sealing strip; 5041. Upper through port; 5042. Lower through port; 505. Partition; 5051. Air supply through hole; 6. Filter cylinder; 7. Negative pressure extraction port; 8. Linkage assembly; 801. Insert rod; 8011. Protrusion; 802. Positioning cavity; 803. Mating part; 8031. Concave block; 8032. Pressing block; 8033. Ball bearing; 804. Sealing cavity. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] Example 1 Powder mixing equipment achieves uniform mixing of powders through mechanical motion and is widely used in pharmaceuticals, chemicals, food, and other fields. During operation, material friction and agitation can easily lead to increased temperature and air pressure. Internal dust can escape from gaps with the high-pressure gas, causing pollution and material loss. Existing technologies mostly use negative pressure suction devices to maintain a low-pressure state inside the cylinder to prevent dust leakage. However, the negative pressure environment also allows outside air to be easily drawn into the chamber through weak points such as the feed inlet and sealing shaft, carrying external dust, moisture, and impurities into the material, resulting in decreased purity of the mixture and damage to product quality.

[0023] This invention provides a dust-free and environmentally friendly powder mixing device, including a mixing device 1, a mixing chamber 101 inside the mixing device 1, and a stirring mechanism 2 for mixing the powder inside the mixing device 1. The stirring mechanism 2 includes a mixing motor 201 disposed on one side of the mixing device 1, and a stirring blade assembly 202 disposed inside the mixing chamber 101. The output end of the mixing motor 201 is driven by the stirring blade assembly 202.

[0024] As a core improvement of this invention, a negative pressure dust collection box 3 is provided above the mixing device 1. The negative pressure dust collection box 3 contains a dust collection negative pressure chamber 301 communicating with the mixing chamber 101, and a first filter chamber 302 communicating laterally with the outside. A negative pressure extraction port 7 is provided on one side of the dust collection negative pressure chamber 301 to maintain a negative pressure state inside the dust collection negative pressure chamber 301, continuously extracting air to maintain a slightly negative pressure state (-0.001~-0.005MPa) in the mixing chamber 101. A filter cylinder 6 is provided between the dust collection negative pressure chamber 301 and the mixing chamber 101, allowing air inside the mixing chamber 101 to enter the dust collection negative pressure chamber 301 through the filter cylinder 6, thereby preventing the powder from leaving the mixing chamber 101. An airflow isolation component 5 is provided between the first filter chamber 302 and the dust collection negative pressure chamber 301. In this embodiment, the airflow isolation component 5 includes a partition 505, and an air supply hole 5051 is provided on the partition 505 for connecting the first filter chamber 302 and the dust collection negative pressure chamber 301.

[0025] The first filter chamber 302 is provided with a first filter plate support 3021, and an upper filter plate 3023 is detachably installed on the first filter plate support 3021. The dust collection negative pressure chamber 301 is provided with a coarse replacement box 3022 on the side near the air supply hole 5051. The first filter plate support 3021 is provided with a linkage component 8 for driving the coarse replacement box 3022 to move.

[0026] A negative pressure monitoring sensor 4 is fixedly installed on the dust collection negative pressure chamber 301 to detect changes in internal air pressure in real time.

[0027] In this embodiment, the powder is fed into the mixing chamber 101 through the feed port 105, and then the mixing motor 201 drives the stirring blade assembly 202 to fully mix the powder inside.

[0028] A negative pressure pump is connected to the negative pressure exhaust port 7, which continuously discharges air from inside the negative pressure dust collection box 3, keeping the inside of the dust collection box 3 under negative pressure. Air in the mixing chamber 101 passes through the filter cartridge 6 under negative pressure and enters the dust collection box 3, effectively filtering and trapping dust. Simultaneously, external air, under the negative pressure inside the dust collection box 3, passes through the upper filter plate 3023 and enters the dust collection box 3, thus preventing external particles from entering the dust collection box 3.

[0029] When the upper filter plate 3023 becomes clogged due to prolonged use, the first filter plate support 3021 can be pulled out from the first filter chamber 302, thereby causing the upper filter plate 3023 to detach from the first filter chamber 302, so that the staff can replace and clean it.

[0030] The service life of the upper filter plate 3023 is closely related to the external environment. If the workshop environment is dusty, the replacement frequency will be higher; if the workshop environment is dust-free, the replacement frequency will be lower. To accurately determine when to replace it, the internal pressure can be detected by the negative pressure monitoring sensor 4. When the pressure difference with the outside reaches a certain range, it indicates that the upper filter plate 3023 is severely clogged and needs to be replaced in time.

[0031] Some powders require prolonged mixing. For example, in the high-purity powder mixing of lithium-ion battery cathode materials, lithium iron phosphate (LiFePO4) cathode active material, supplemented with conductive agent and binder powders, is mixed in a strict accordance with the process ratio, with a total solid content ≥85%. The mixing time is 4–6 hours. This time is an industry standard process requirement, aiming to achieve uniform dispersion at the microscopic level, ensuring a continuous conductive network and consistent distribution of active materials, and avoiding local agglomeration that leads to increased battery internal resistance and reduced cycle life.

[0032] This means that the upper filter plate 3023 may need to be replaced during the mixing process. If a regular filter plate is used, replacing it midway through mixing will render it ineffective and cause dust pollution.

[0033] To address the aforementioned issues, a coarse replacement box 3022 is linked to the rear side of the first filter plate support 3021, and moves together with the first filter plate support 3021. When the first filter plate support 3021 moves away from the air supply hole 5051 on the partition 505, the coarse replacement box 3022 moves back above the air supply hole 5051, thereby filtering the air that needs to pass through the air supply hole 5051, ensuring uninterrupted filtration during the replacement of the upper filter plate 3023.

[0034] The upper filter plate 3023 needs to maintain a relatively weak filtration resistance. The purpose of the first filter chamber 302 is to maintain the stability of the negative pressure state inside the dust collection negative pressure chamber 301, and to avoid excessive negative pressure caused by continuous suction from the negative pressure extraction port 7. When the temperature rises due to mixing inside the mixing chamber 101, the airflow in the mixing chamber 101 enters the dust collection negative pressure chamber 301. The upper filter plate 3023 can keep the negative pressure state inside the dust collection negative pressure chamber 301 stable. The gas entering the dust collection negative pressure chamber 301 from the mixing chamber 101 and the first filter chamber 302 will balance the pressure of the dust collection negative pressure chamber 301. When the gas supplied to the mixing chamber 101 decreases, the first filter chamber 302 compensates, thereby maintaining the stability of the negative pressure environment inside the mixing chamber 101, and preventing external dust from being sucked in from other weak gaps due to excessive negative pressure, which would contaminate the powder.

[0035] In this embodiment, as an optional implementation method, such as Figure 3As shown, the first filter plate support 3021 has a side air inlet hole 3024 that communicates with the outside. The side air inlet hole 3024 faces to one side and has a small opening to reduce the impact of external dust.

[0036] As an optional implementation, the first filter plate support 3021 is fixedly connected to the coarse replacement box 3022 to ensure the reliability of the linkage movement.

[0037] As an optional implementation, an upper sealing cover 104 is provided above the mixing chamber 101. The upper sealing cover 104 and the mixing chamber 101 adopt a double-layer sealing fit to effectively prevent external dust from entering the chamber. A feeding port 105 is provided on the upper sealing cover 104, through which powder is added into the mixing chamber 101. A discharge port 102 is provided at the bottom of the mixing chamber 101, and a pneumatic discharge gate 103 is provided on the discharge port 102. By controlling the position of the pneumatic discharge gate 103, the opening and closing of the discharge port 102 is controlled to achieve precise material discharge.

[0038] It should be emphasized that the core improvement of this embodiment lies in the following: A negative pressure dust collection box 3 is provided above the mixing device 1, internally comprising a dust collection negative pressure chamber 301 communicating with the mixing chamber 101 and a first filter chamber 302 communicating with the outside. The dust collection negative pressure chamber 301 maintains a negative pressure state through an external negative pressure pump connected to the negative pressure extraction port 7. Air from the mixing chamber 101 enters the dust collection negative pressure chamber 301 through the filter cartridge 6 to trap dust, while external air enters through the upper filter plate 3023 to prevent dust intrusion. The first filter chamber 302 provides compensation, thereby maintaining a stable negative pressure environment inside the mixing chamber 101 and preventing excessively strong negative pressure from causing external dust to be sucked in from other weak gaps, thus contaminating the powder. The first filter plate support 3021 can be pulled out to replace the upper filter plate 3023. Behind it, the coarse replacement box 3022 is linked. When the support is pulled away from the air inlet 5051, the coarse replacement box 3022 automatically moves above the air inlet 5051 to replace the filter, ensuring uninterrupted filtration during replacement. The negative pressure monitoring sensor 4 monitors the air pressure in real time to determine the degree of filter plate blockage and guide the replacement timing.

[0039] Example 2 In Example 1, as Figure 4 As shown, the coarse replacement box 3022 needs to move synchronously with the first filter plate support 3021. Therefore, the coarse replacement box 3022 needs to maintain a certain length to ensure sufficient effective filtration area. However, the larger the volume of the coarse replacement box 3022, the more difficult it is to guarantee its sealing effect, which can easily lead to air leakage when replacing the filter plate 3023 during the mixing process.

[0040] To address the aforementioned issues, the airflow isolation assembly 5 includes a front isolation plate 501 and a substrate 502 fixedly connected to the first filter chamber 302. The front isolation plate 501 and the substrate 502 are distributed front to back, as shown below. Figure 4 , Figure 5 As shown. Rotary rollers 503 are rotatably mounted at both ends of the substrate 502. Sealing strips 504 are fitted onto the substrate 502 and the rollers 503, and the sealing strips 504 slide against the substrate 502. Alignment openings 5021 are provided on the substrate 502. Two sets of upper through-holes 5041 are provided on the upper part of the sealing strip 504 on the substrate 502, one of which communicates with the interior of the coarse replacement box 3022. Two sets of lower through-holes 5042 are provided on the lower part of the sealing strip 504 on the substrate 502, and the positions of the two sets of lower through-holes 5042 correspond to the positions of the two sets of upper through-holes 5041.

[0041] In this embodiment, when the upper filter plate 3023 needs to be replaced, the first filter plate support 3021 can be pulled. The first filter plate support 3021 drives the coarse replacement box 3022 to move, and the coarse replacement box 3022 drives the sealing strip 504 to move along the substrate 502 and the moving roller 503. This causes the lower through-hole 5042 and the upper through-hole 5041 on the sealing strip 504, which originally corresponded to the alignment port 5021, to be misaligned. Then, the upper through-hole 5041 connected to the coarse replacement box 3022 moves above the alignment port 5021, and the other set of lower through-holes 5042 also aligns with the upper through-hole 5041 and the alignment port 5021, thereby achieving through-flow. After entering the first filter chamber 302, external air enters the coarse replacement box 3022, and then enters the dust collection negative pressure chamber 301 through the through-flow alignment port 5021, thereby achieving the effect of short-term filter replacement and avoiding loss of filtration function when replacing the upper filter plate 3023.

[0042] In the above scheme, the coarse replacement box 3022 needs to be moved to the upper side of the alignment port 5021 to achieve the through effect. However, when the first filter plate support 3021 is installed with the filter plate 3023, its positioning position is uncertain, which may cause the coarse replacement box 3022 to fail to be accurately aligned with the alignment port 5021.

[0043] To solve the above problems, such as Figure 11As shown, the linkage assembly 8 includes an insert rod 801 fixedly mounted on the rear side of the first filter plate support 3021, and a positioning cavity 802 and a sealing cavity 804 formed on the coarse replacement box 3022. The positioning cavity 802 is slidably aligned with the insert rod 801, and a protrusion 8011 is provided at the end of the insert rod 801. A mating part 803 is slidably fitted inside the sealing cavity 804. The mating part 803 includes a concave block 8031 ​​that mates with the protrusion 8011. A pressure block 8032 is fixedly mounted at the bottom of the concave block 8031, and the pressure block 8032 is slidably fitted with the sealing cavity 804. A ball bearing 8033 is provided at the bottom of the pressure block 8032. When the ball bearing 8033 moves above the alignment opening 5021, the mating part 803 falls into the alignment opening 5021, releasing the lock between the concave block 8031 ​​and the protrusion 8011.

[0044] In the above scheme, the movement of the coarse replacement box 3022 is divided into two stages: Phase 1: When the first filter plate support 3021 is pulled away from the alignment port 5021, the first filter plate support 3021 drives the insertion rod 801 to move. The insertion rod 801 in the positioning cavity 802 drives the mating part 803 to move through the protrusion 8011, which in turn drives the coarse replacement box 3022 to move. The bottom of the ball 8033 contacts the substrate 502, reducing friction while maintaining the limiting position of the mating part 803 on the insertion rod 801. Phase Two: When the coarse replacement box 3022 moves above the alignment port 5021, the lower end of the mating part 803 falls into the alignment port 5021, and the pressure block 8032 limits and seals the sealing cavity 804. At this time, the concave block 8031 ​​moves away from the protrusion 8011, thereby releasing the limiting effect of the mating part 803 on the insertion rod 801. The insertion rod 801 separates from the positioning cavity 802, and the first filter plate support 3021 and the coarse replacement box 3022 no longer move together.

[0045] When the first filter plate support 3021 is installed with the upper filter plate 3023, the first filter plate support 3021 can be pushed to realign with the coarse replacement box 3022. The steps are the reverse of those described above and will not be repeated here.

[0046] It should be emphasized that the core improvement of this embodiment lies in addressing the problem of sealing difficulties caused by the large size of the coarse replacement box 3022. The airflow isolation component 5 adopts a structure in which the front isolation plate 501 and the base plate 502 cooperate. The base plate 502 has moving rollers 503 at both ends, which slide in conjunction with the sealing strip 504. The sealing strip 504 has upper and lower through-holes 5042. When the pull-out seat is pulled, the coarse replacement box 3022 is driven to move the sealing strip 504. The through-holes are aligned with the alignment port 5021 of the base plate 502 to allow air to pass through the filter. The linkage component 8 drives the coarse replacement box 3022 to move through the insertion rod 801 and the positioning cavity 802. The movement is divided into two stages: in the first stage, the insertion rod 801 drives the coarse replacement box 3022 to move synchronously; in the second stage, the mating part 803 falls into the alignment port 5021 and is unlocked, realizing the separation of the pull-out seat and the coarse replacement box 3022, ensuring accurate positioning and reliable sealing when replacing the filter plate.

[0047] Third Embodiment For some application scenarios with stringent processing environment requirements, such as the mixed production of antibiotic powders, vaccine excipients, and traditional Chinese medicine ultrafine powders, it is necessary to strictly prevent particulate contamination and moisture intrusion, intercept bacterial particles and moisture, and meet GMP aseptic production requirements. A single set of upper filter plates 3023 is often insufficient to meet the mixing requirements. In this case, multiple sets of dedicated filter components are needed to perform multi-stage filtration of the air, such as absorbing moisture in the air and intercepting finer particles. The above-mentioned single filtration solution cannot meet such requirements.

[0048] To solve the above problems, such as Figure 10 As shown, a second filter chamber 303 is disposed between the first filter chamber 302 and the dust collection negative pressure chamber 301. A second filter plate support 3031 is slidably fitted inside the second filter chamber 303. A fine filter replacement box 3032 is disposed at the rear of the second filter chamber 303, and a lower filter plate 3033 is mounted on the second filter plate support 3031. A linkage assembly 8 for driving the fine filter replacement box 3032 is disposed on the second filter plate support 3031. Two sets of airflow isolation assemblies 5 are provided, respectively disposed between the first filter chamber 302 and the second filter chamber 303, and between the dust collection negative pressure chamber 301 and the second filter chamber 303.

[0049] The first filter chamber 302 and the second filter chamber 303 are used in the same way, but the difference is that the first filter chamber 302 is equipped with a coarse replacement box 3022, while the second filter chamber 303 is equipped with a fine replacement box 3032. The fine replacement box 3032 is vertically connected. When the fine replacement box 3032 is aligned with the alignment port 5021 on the two sets of substrates 502, fine filtration of air is achieved. The filter pore size of the fine replacement box 3032 is smaller than that of the coarse replacement box 3022 to achieve a finer filtration effect. At the same time, the upper filter plate 3023 and the lower filter plate 3033 are filter plates with different special functions and can be installed separately according to actual needs.

[0050] It should be emphasized that the core improvement of this embodiment lies in addressing the issue that a single filtration method cannot meet the needs of high-cleanliness scenarios. A second filtration chamber 303 is added between the first filtration chamber 302 and the dust collection negative pressure chamber 301. This second filtration chamber contains a second filter plate support 3031, a fine replacement box 3032, and a lower filter plate 3033. The fine replacement box 3032 is vertically continuous, with a smaller pore size than the coarse replacement box 3022, achieving finer air filtration. The second filtration chamber 303 is equipped with an independent airflow isolation component 5, and its operation is the same as that of the first filtration chamber 302. Filtration and replacement are achieved by pulling the fine replacement box 3032 along with a pull-out seat. The upper filter plate 3023 and the lower filter plate 3033 have different functions and can be installed separately according to actual needs, forming a multi-stage filtration system that effectively intercepts fine particles and absorbs moisture, meeting the requirements of harsh processing environments.

[0051] Working principle: During operation, the powder mixing equipment of the present invention first feeds powder into the mixing chamber 101 through the feed port 105, and then starts the mixing motor 201 to drive the stirring blade assembly 202 to fully mix and blend the powder in the chamber. During the mixing process, the friction and stirring of the materials generate heat, which causes the temperature and air pressure inside the mixing chamber 101 to rise. If this is not controlled, the dust inside will overflow from the equipment gaps with the high-pressure gas, causing environmental pollution and material loss.

[0052] To solve the above problems, a negative pressure pump connected to the negative pressure extraction port 7 operates continuously, slowly expelling the air from inside the negative pressure dust collection box 3, keeping the dust collection box 3 under negative pressure at all times. Air carrying dust in the mixing chamber 101 passes through the filter cartridge 6 under negative pressure and enters the dust collection negative pressure chamber 301. The dust is trapped by the filter cartridge 6, while clean air continues to enter the dust collection negative pressure chamber 301, thus preventing the powder from leaving the mixing chamber 101. Simultaneously, because the inside of the negative pressure dust collection box 3 is continuously under negative pressure, outside air, driven by the pressure difference, passes sequentially through the upper filter plate 3023 and the first filter chamber 302, enters the dust collection negative pressure chamber 301 through the air supply hole 5051, and is then discharged through the negative pressure extraction port 7. The upper filter plate 3023 filters the incoming outside air, intercepting external dust, moisture, and impurities, preventing them from mixing into the dust collection negative pressure chamber 301 and contaminating the powder in the mixing chamber 101.

[0053] When the temperature rises and the gas expands in the mixing chamber 101, a large amount of airflow generated in the mixing chamber 101 enters the dust collection negative pressure chamber 301. At this time, the first filter chamber 302 compensates for the air in the dust collection negative pressure chamber 301 through the upper filter plate 3023, balancing the internal pressure of the dust collection negative pressure chamber 301 and preventing excessive negative pressure. When the temperature of the mixing chamber 101 tends to stabilize and the generated airflow decreases, the amount of air entering the first filter chamber 302 continuously increases accordingly, always maintaining the dynamic balance of the negative pressure state inside the dust collection negative pressure chamber 301, preventing external dust from being sucked into the chamber from weak points such as the feed inlet and sealing shaft due to excessive negative pressure.

[0054] When the upper filter plate 3023 becomes clogged due to long-term use, the negative pressure monitoring sensor 4 monitors the changes in air pressure inside the dust collection negative pressure chamber 301 in real time. When the pressure difference between the dust collection negative pressure chamber 301 and the outside is detected to exceed the set range, it indicates that the upper filter plate 3023 is severely clogged and needs to be replaced. The operator pulls the first filter plate support 3021 out of the first filter chamber 302, causing the upper filter plate 3023 to detach from the first filter chamber 302 for replacement and cleaning. As the pull-out support moves away from the air supply hole 5051, the coarse replacement box 3022 linked behind it moves synchronously and automatically moves above the air supply hole 5051, replacing the upper filter plate 3023 to filter the air passing through the air supply hole 5051, ensuring that the filtration function is not interrupted during replacement and that dust in the mixing chamber 101 does not leak out.

[0055] After replacement, the first filter plate support 3021 is pushed back into the first filter chamber 302, and the coarse replacement box 3022 moves away from above the air supply hole 5051, and the upper filter plate 3023 resumes normal filtration operation. The discharge port 102 at the bottom of the mixing chamber 101 achieves precise material discharge through the opening and closing of the pneumatic discharge gate 103, and the double-layer sealing cooperation between the upper sealing cover 104 and the mixing chamber 101 prevents external dust from entering from the top throughout the process.

[0056] In Embodiment 2, when replacing the upper filter plate 3023, pulling the first filter plate support 3021 moves the coarse replacement box 3022. The coarse replacement box 3022 causes the sealing strip 504 to slide along the substrate 502 and the moving roller 503. The lower through-hole 5042 on the sealing strip 504 is staggered and then aligned with the upper through-hole 5041 in sequence. The upper through-hole 5041 connecting the coarse replacement box 3022 moves to above the alignment port 5021 on the substrate 502 and communicates with the lower through-hole 5042. External air enters the coarse replacement box 3022 through the first filter chamber 302 and then passes through the through-hole and alignment port 5021 into the dust collection negative pressure chamber 301, realizing replacement filtration. This process is divided into two stages: In the first stage, the insertion rod 801 moves synchronously within the positioning cavity 802 via the protrusion 8011, driving the mating part 803 and the rough replacement box 3022 to move synchronously, and the ball 8033 contacts the substrate 502 to reduce friction. In the second stage, when the coarse replacement box 3022 moves above the alignment port 5021, the mating part 803 falls into the alignment port 5021 and is unlocked. The insertion rod 801 separates from the positioning cavity 802, and the pull-out seat and the coarse replacement box 3022 no longer move together, ensuring accurate positioning and reliable sealing.

[0057] In Embodiment 3, for scenarios requiring high cleanliness, a second filter chamber 303 is added between the first filter chamber 302 and the dust collection negative pressure chamber 301. Before entering the dust collection negative pressure chamber 301, external air must pass through the lower filter plate 3033, the second filter chamber 303, and the fine replacement box 3032 in sequence. The fine replacement box 3032 has a smaller pore size than the coarse replacement box 3022, achieving finer air filtration. When the lower filter plate 3033 needs to be replaced, the second filter plate support 3031 drives the fine replacement box 3032 to move. Its operation is the same as that of the first filter chamber 302, achieving replacement filtration through the through-hole of the sealing strip 504 and the alignment port 5021. The upper filter plate 3023 and the lower filter plate 3033 have different functions and can be installed separately according to actual needs to form a multi-stage filtration system, effectively intercepting fine particles and absorbing moisture to meet the requirements of harsh processing environments.

[0058] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed application.

Claims

1. A dust-free and environmentally friendly powder mixing device, comprising a mixing device (1), wherein the mixing device (1) has a mixing chamber (101) inside, and a stirring mechanism (2) is provided on the mixing device (1), characterized in that: A negative pressure dust collection box (3) is provided above the mixing device (1). The negative pressure dust collection box (3) is provided with a dust collection negative pressure chamber (301) that communicates with the mixing chamber (101) and a first filter chamber (302) that communicates with the outside side. A negative pressure exhaust port (7) is provided on one side of the dust collection negative pressure chamber (301) to maintain the negative pressure state inside the dust collection negative pressure chamber (301). A filter cylinder (6) is provided between the dust collection negative pressure chamber (301) and the mixing chamber (101). An airflow isolation component (5) is provided between the first filter chamber (302) and the dust collection negative pressure chamber (301). The airflow isolation component (5) includes a partition (505) and an air supply hole (5051) is provided on the partition (505). The first filter chamber (302) is provided with a first filter plate support (3021), and an upper filter plate (3023) is installed on the first filter plate support (3021). The dust collection negative pressure chamber (301) is provided with a coarse replacement box (3022) on the side near the air supply hole (5051). The first filter plate support (3021) is provided with a linkage component (8) for driving the coarse replacement box (3022) to move.

2. The dust-free and environmentally friendly powder mixing equipment as described in claim 1, characterized in that, The airflow isolation assembly (5) includes a front isolation plate (501) and a base plate (502) fixedly connected to the first filter chamber (302). The front isolation plate (501) and the base plate (502) are distributed front to back. The base plate (502) is rotatably provided with moving rollers (503) at both ends. The base plate (502) and the moving rollers (503) are fitted with sealing strips (504). The sealing strips (504) are slidably fitted with the base plate (502). The substrate (502) has an alignment opening (5021), and the sealing strip (504) has two sets of upper through openings (5041) on the upper side of the substrate (502). One set of the upper through openings (5041) is connected to the inside of the coarse replacement box (3022), and the sealing strip (504) has two sets of lower through openings (5042) on the lower side of the substrate (502).

3. A dust-free and environmentally friendly powder mixing device as described in claim 1 or 2, characterized in that, A second filter chamber (303) is provided between the first filter chamber (302) and the dust collection negative pressure chamber (301); The second filter chamber (303) is slidably fitted with a second filter plate support (3031), a fine replacement box (3032) is provided on the rear side of the second filter chamber (303), and a lower filter plate (3033) is installed on the second filter plate support (3031). The second filter plate support (3031) is provided with a linkage component (8) for driving the fine replacement box (3032) to move; The airflow isolation assembly (5) is provided in two sets, which are respectively located between the first filter chamber (302) and the second filter chamber (303) and between the dust collection negative pressure chamber (301) and the second filter chamber (303).

4. The dust-free and environmentally friendly powder mixing equipment as described in claim 3, characterized in that, The linkage component (8) includes a rod (801) fixedly installed on the rear side of the first filter plate support (3021) and the second filter plate support (3031). The coarse replacement box (3022) and the fine replacement box (3032) are both provided with a positioning cavity (802) and a sealing cavity (804). The positioning cavity (802) is slidably aligned with the insertion rod (801), and a protrusion (8011) is provided at the end of the insertion rod (801); The sealing cavity (804) is slidably fitted with a fitting component (803). The fitting component (803) includes a recess (8031) that mates with a protrusion (8011). A pressure block (8032) is fixedly provided at the bottom of the recess (8031). The pressure block (8032) is slidably fitted with the sealing cavity (804). A ball bearing (8033) is provided at the bottom of the pressure block (8032). When the ball bearing (8033) moves to above the alignment port (5021), the fitting component (803) falls down, releasing the lock between the recess (8031) and the protrusion (8011).

5. The dust-free and environmentally friendly powder mixing equipment as described in claim 3, characterized in that, The first filter plate support (3021) has a lateral air inlet hole (3024) that communicates with the outside.

6. The dust-free and environmentally friendly powder mixing equipment as described in claim 5, characterized in that, A negative pressure monitoring sensor (4) is fixedly installed on the dust collection negative pressure chamber (301) to detect the internal air pressure.

7. The dust-free and environmentally friendly powder mixing equipment as described in claim 1, characterized in that, An upper sealing cover (104) is provided above the mixing chamber (101), and the upper sealing cover (104) is sealed to the mixing chamber (101). A material conveying port (105) is provided on the upper sealing cover (104).

8. The dust-free and environmentally friendly powder mixing equipment as described in claim 7, characterized in that, The bottom of the mixing chamber (101) is provided with a discharge port (102), and a pneumatic unloading gate (103) is provided on the discharge port (102).

9. The dust-free and environmentally friendly powder mixing equipment as described in claim 8, characterized in that, The stirring mechanism (2) includes a mixing motor (201) disposed on one side of the mixing device (1), and a stirring blade assembly (202) is disposed inside the mixing chamber (101). The output end of the mixing motor (201) is in drive cooperation with the stirring blade assembly (202).

10. The dust-free and environmentally friendly powder mixing equipment as described in claim 6, characterized in that, The negative pressure extraction port (7) is connected to an external negative pressure pump.

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