Vibration screening device capable of preventing powder leakage and using method of vibration screening device

Abstract

The invention relates to the technical field of powder processing, in particular to a vibration screening device capable of preventing powder leakage and a using method of the vibration screening device. The powder screening machine is arranged in the frame, the frame provides support for the powder screening machine, the powder screening machine comprises a pressure controller, an electromagnetic valve and a rotary connector, and the pressure controller and the electromagnetic valve are arranged in a gas circuit pipeline of the powder screening machine; the rotary connector comprises a rubber ring, a sealing plate and a connector body, the sealing plate is arranged in the connector body, the rubber ring is arranged between the sealing plate and the connector body, the sealing plate is suitable for rotatably adjusting the opening degree of the connector body, and the rubber ring is suitable for enabling the sealing plate to be tightly attached to the connector body. A rotary connector structure is adopted, a rubber ring, a sealing plate and a connector body cooperate, the opening degree is flexibly adjusted through rotation of the sealing plate, the air pressure in the powder screening machine can be accurately adjusted and controlled through an air path pipeline system of a pressure controller and an electromagnetic valve, and dust dissipation is further restrained.

Description

Technical Field

[0001] The present invention relates to the technical field of powder processing, and in particular to a vibration screening device for preventing powder leakage and a use method thereof. Background Art

[0002] Vibration screening for powder processing is a mechanical separation device that uses a vibrating motor to drive a screen mesh to generate high-frequency vibrations, grading and screening mixed powders by particle size. Its operating principle is to use vibration to cause the powder to bounce across the screen surface. Fine particles pass through the mesh and become undersize, while coarse particles move along the screen surface to be discharged. This achieves particle size classification, impurity removal, and homogenization of the powder. It is widely used in powder processing in the chemical, food, and pharmaceutical industries.

[0003] In the powder processing industry, vibration screening is a key process link, especially in screening operations involving flammable and easily oxidizable powders. It is often necessary to fill in inert gases such as nitrogen to isolate oxygen and prevent spontaneous combustion or oxidation of the materials. However, the existing technology has significant defects in practical applications: in the dynamic balance control of nitrogen filling and exhaust, sudden changes in system pressure are often caused by operating errors or unreasonable equipment design. For example, manually closing the exhaust valve or adding additional pressure will cause a sudden increase in the pressure inside the container. At the same time, unsealed weak links are prone to powder splashing due to pressure imbalance, which not only causes material leakage and waste, but also poses safety hazards such as spontaneous combustion and explosion, seriously threatening the safety of operators and production continuity. Summary of the Invention

[0004] In view of this, the present invention provides a vibration screening device for preventing powder leakage and a method of using the same, so as to solve the problem of powder leakage caused by pressure imbalance.

[0005] In a first aspect, the present invention provides a vibrating screening device for preventing powder leakage, comprising:

[0006] frame;

[0007] The powder sifter is arranged in the frame, and the frame provides support for the powder sifter. The powder sifter includes a pressure controller, a solenoid valve and a rotary interface. The pressure controller and the solenoid valve are arranged in the air pipeline of the powder sifter, and the rotary interface is arranged at the inlet and outlet of the material of the powder sifter;

[0008] The rotating interface includes a rubber ring, a closing plate and an interface body. The closing plate is arranged in the interface body, and the rubber ring is arranged between the closing plate and the interface body. The closing plate is suitable for rotating to adjust the opening degree of the interface body, and the rubber ring is suitable for making the closing plate fit tightly with the interface body.

[0009] Beneficial effects: The vibration screening device for preventing powder leakage provided by the present invention solves the problems of easy leakage and poor sealing of traditional screening equipment during powder processing, and improves the cleanliness and safety of the production environment. A rotating interface structure is adopted, and the rubber ring, the closing plate and the interface body work together. The opening degree is flexibly adjusted by the rotation of the closing plate, and the rubber ring ensures the close fit between the closing plate and the interface body, forming a dynamic seal, thereby effectively blocking the overflow of powder during the material in and out process. At the same time, the air pipeline system of the pressure controller and the solenoid valve can accurately control the internal air pressure of the powder screening machine, further suppressing dust emission. It not only greatly reduces material loss, but also reduces cleaning and maintenance costs, and extends the life of the equipment. The stable support of the frame and the modular layout of the powder screening machine are more convenient for installation, maintenance and adaptation to different working conditions. The overall structure has both sealing reliability and convenient operation.

[0010] In an optional embodiment, the upper material barrel and the lower material barrel are arranged at the upper inlet of the powder sifting machine, and the lower material barrel is arranged at the outlet of the powder sifting machine, and the rotary interface is respectively arranged between the upper material barrel and the powder sifting machine and the lower material barrel and the powder sifting machine.

[0011] Beneficial Effects: By installing rotary interfaces between the loading bucket and the sifter inlet, and between the unloading bucket and the sifter outlet, a fully enclosed powder conveying environment is created, avoiding the dust emission problems associated with traditional open-type feeding and receiving processes. The dynamic sealing structure of the rotary interface adjusts the opening and closing degree in real time according to the material flow rate, ensuring smooth powder entry into the screening chamber during loading and effectively cushioning the impact of falling materials during unloading, preventing fine powder from raising dust. This allows the screening process to be carried out completely in a sealed environment. The docking of the upper and lower loading buckets with the sifter simplifies the equipment assembly and disassembly process, facilitating quick screen replacement, cleaning, and maintenance.

[0012] In an optional embodiment, the powder sifting machine further includes: an air pipe, one end of which is connected to the interior of the powder sifting machine, and a pressure controller and an electromagnetic valve are suitable for detecting the pressure in the powder sifting machine to control the gas flow rate in the air pipe.

[0013] Beneficial effects: By setting up an air pipe inside the powder sifting machine and integrating a pressure controller and a solenoid valve, dynamic regulation of the air pressure inside the screening chamber is achieved, and the pressure changes inside the powder sifting machine are monitored in real time. When an abnormal pressure increase due to material flow or vibration is detected, the solenoid valve automatically adjusts the gas flow rate in the air pipe to quickly balance the internal and external pressure differences, effectively preventing dust splashing caused by positive pressure or screen clogging caused by negative pressure.

[0014] In an optional embodiment, the rotation interface further includes: a push rod, the push rod is connected to the closing plate, and pushing the push rod is suitable for controlling the rotation of the closing plate.

[0015] Beneficial Effects: By incorporating a push rod mechanism into the rotary interface, mechanical control of the closing plate's opening and closing degree is achieved, improving the convenience and reliability of seal adjustment. Simply pushing the push rod controls the closing plate's rotation angle without directly touching the seal. This avoids the common problems of manual adjustment, such as jamming or overtightening, while also enabling real-time adjustment of material flow during equipment operation.

[0016] In an optional embodiment, the powder screening machine further includes: a connecting device, and the discharge barrel and the powder screening machine are connected in sequence via the connecting device and the rotary interface.

[0017] Beneficial Effects: By adding a connecting device between the discharge barrel and the powder sifter and using it in conjunction with a rotary interface, the connecting device effectively absorbs displacement caused by the powder sifter's vibration, preventing deformation and leakage caused by a rigid connection, and reducing dust emission. When combined with the rotary interface, the connecting device first provides a primary buffer against the impact of material discharge, while the rotary interface then precisely controls the discharge speed through dynamic sealing, improving work efficiency.

[0018] In an optional embodiment, an air pump is provided, and the other end of the air tube is connected to the air pump.

[0019] Beneficial effect: By connecting the other end of the air tube to an air pump, the air pump can provide stable gas filling as a power source.

[0020] In a second aspect, the present invention further provides a method for using a vibrating screening device for preventing powder leakage, which is applied to the vibrating screening device for preventing powder leakage described above, comprising:

[0021] Open the pressure controller and solenoid valve to monitor the gas pressure in the powder sifter in real time;

[0022] Adjust the opening of the rotary interface in time according to the different characteristics of the powder;

[0023] Maintain the gas pressure in the sifter within the preset range until the sifting operation is completed.

[0024] Beneficial Effects: The present invention utilizes a vibrating screening device to prevent powder leakage, achieving full-process powder leakage prevention through intelligent air pressure management and dynamic sealing adjustment. A pressure controller and solenoid valve monitor the air pressure inside the sifter in real time, automatically adjusting the air pump output to maintain the optimal operating pressure range. This effectively suppresses dust escape caused by pressure fluctuations. The push rod mechanism precisely adjusts the opening of the rotary interface based on material properties, ensuring optimal sealing and flow efficiency for powders with varying physical properties.

[0025] In an optional embodiment, real-time monitoring of the gas pressure in the powder sifter includes:

[0026] When the gas pressure in the powder sifting machine is lower than the preset minimum pressure, the pressure sensor transmits an open signal and the solenoid valve opens to replenish gas. When the gas pressure in the powder sifting machine is higher than the preset maximum pressure, the pressure sensor transmits a close signal and the solenoid valve cuts off the gas supply.

[0027] Beneficial Effects: This invention regulates the internal air pressure of the powder sifter through the coordinated control of a pressure sensor and a solenoid valve, ensuring that the sieving process always maintains an optimal pressure environment. When the pressure sensor detects that the air pressure falls below a preset lower limit, the solenoid valve is immediately triggered to open and replenish air; when the air pressure exceeds the upper limit, the air supply is quickly cut off. This solves the problem of powder spraying or suction caused by pressure fluctuations in traditional equipment and reduces dust escape.

[0028] In an optional embodiment, before opening the pressure controller and the solenoid valve, the method further includes:

[0029] Assemble a vibrating screening device to prevent powder leakage;

[0030] Turn on the air pump and adjust the rotary interface to the open position.

[0031] Beneficial Effects: Through standardized equipment assembly and startup processes, the vibrating screening device ensures optimal leak-proof performance from the outset. Prior to formal screening, key components, including the air pump and rotary interface, are assembled to ensure optimal coordination of the sealing structures. During startup, the air pump is first operated to establish a base pressure environment, and then the rotary interface is adjusted to the standard open position, ensuring a stable dust barrier before material is added.

[0032] In an optional embodiment, after the powder screening operation is completed, the method includes: adjusting the rotary interface to a closed state.

[0033] Beneficial Effects: By closing the rotary interface immediately after the screening operation, dust sealing is achieved throughout the entire process, avoiding material leakage during the downtime of traditional equipment. The operator quickly resets the rotary interface's closing plate using a push rod mechanism, which, combined with the elastic sealing action of the rubber ring, forms a mechanical seal at the interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a vibrating screening device for preventing powder leakage according to the present invention;

[0036] Figure 2 A schematic diagram of the airflow and pipeline of the vibrating screening device for preventing powder leakage according to the present invention;

[0037] Figure 3 Schematic diagram of the rotary interface of the present invention.

[0038] Description of reference numerals:

[0039] 1. Frame; 2. Loading barrel; 3. Powder sifter; 31. Air pipe; 32. Pressure controller; 33. Connecting device; 34. Rotating interface; 341. Push rod; 342. Rubber ring; 343. Closing plate; 344. Interface body; 35. Solenoid valve; 4. Air pump; 5. Unloading barrel. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Vibratory screening in powder processing is a mechanical separation device that uses a vibrating motor to drive a screen mesh to generate high-frequency vibrations. Its core function is to use vibration to cause the mixed powder to bounce across the screen surface, thereby achieving particle size classification. Specifically, fine particles pass through the sieve holes under the action of vibration, while coarse particles move along the screen surface to the outlet for discharge. This process not only efficiently separates powders of different particle sizes but can also be used for impurity removal or homogenization. Due to its high efficiency and adaptability, vibratory screening is widely used in powder processing in the chemical, food, pharmaceutical, and other industries, playing a particularly important role in processes requiring precise control of particle size.

[0045] When screening flammable and easily oxidizable powders, vibratory screening systems are typically filled with inert gases such as nitrogen to isolate oxygen and prevent spontaneous combustion or oxidation. However, existing technologies have significant shortcomings in controlling the dynamic balance of nitrogen. On the one hand, operational errors or improper equipment design can cause a sudden increase in internal system pressure. On the other hand, weak links that are not fully sealed can easily cause powder splashing when the pressure differential is unbalanced. These problems not only cause material leakage and waste, but also can cause spontaneous combustion or even explosion due to the powder's exposure to oxygen, seriously threatening operator safety and production continuity.

[0046] The following combination Figures 1 to 3 , describing embodiments of the present invention.

[0047] According to an embodiment of the present invention, on the one hand, a vibration screening device for preventing powder leakage is provided, comprising:

[0048] Frame 1;

[0049] The powder sifter 3 is arranged in the frame 1, and the frame 1 provides support for the powder sifter 3. The powder sifter 3 includes a pressure controller 32, a solenoid valve 35 and a rotary interface 34. The pressure controller 32 and the solenoid valve 35 are arranged in the air pipeline of the powder sifter 3. The rotary interface 34 is arranged at the inlet and outlet of the material of the powder sifter 3;

[0050] The rotating interface 34 includes a rubber ring 342, a closing plate 343 and an interface body 344. The closing plate 343 is arranged in the interface body 344, and the rubber ring 342 is arranged between the closing plate 343 and the interface body 344. The closing plate 343 is suitable for rotating to adjust the opening degree of the interface body 344, and the rubber ring 342 is suitable for making the closing plate 343 fit tightly with the interface body 344.

[0051] The vibration screening device for preventing powder leakage provided by the present invention solves the problems of easy leakage and poor sealing of traditional screening equipment during powder processing, and improves the cleanliness and safety of the production environment. A rotating interface 34 structure is adopted, and the rubber ring 342, the closing plate 343 and the interface body 344 work together. The opening degree can be flexibly adjusted by rotating the closing plate 343, while the rubber ring 342 ensures the close fit between the closing plate 343 and the interface body 344, forming a dynamic seal, thereby effectively blocking the overflow of powder during the material in and out process. At the same time, the air pipeline system of the pressure controller 32 and the solenoid valve 35 can accurately control the internal air pressure of the powder screening machine 3, further suppressing dust emission. It not only greatly reduces material loss, but also reduces cleaning and maintenance costs, and extends the life of the equipment. The stable support of the frame 1 and the modular layout of the powder screening machine 3 are more convenient for installation, maintenance and adaptation to different working conditions. The overall structure has both sealing reliability and convenient operation.

[0052] Specifically, the frame 1 is provided with a loading platform, the powder screening machine 3 is provided on the loading platform, the frame 1 is a hard steel frame structure, the pressure controller 32 can transmit the pressure signal to the solenoid valve 35, and the solenoid valve 35 is a two-position two-way solenoid valve 35.

[0053] In some embodiments, combined Figure 1 As shown, the upper material barrel 2 and the lower material barrel 5, the upper material barrel 2 is arranged at the entrance above the powder sifting machine 3, the lower material barrel 5 is arranged at the outlet of the powder sifting machine 3, and the rotating interface 34 is respectively arranged between the upper material barrel 2 and the powder sifting machine 3 and the lower material barrel 5 and the powder sifting machine 3.

[0054] By providing rotary interfaces 34 between the loading barrel 2 and the inlet of the powder sifter 3, and between the unloading barrel 5 and the outlet of the powder sifter 3, a fully enclosed powder conveying environment is created, avoiding the dust emission problem encountered during the traditional open feeding and receiving processes. The dynamic sealing structure of the rotary interface 34 can adjust the opening and closing degree in real time according to the material flow rate, ensuring that the powder enters the screening chamber smoothly during loading, and effectively cushioning the impact of falling materials during unloading, preventing fine powder from raising dust. The screening process is carried out completely in a sealed environment. The docking method of the upper and lower loading barrels 5 and the powder sifter 3 simplifies the equipment disassembly and assembly process, facilitating quick replacement of screens or cleaning and maintenance.

[0055] Specifically, the feeding bucket 2 is arranged above the powder sifter 3, and gravity can be used to make the material fall naturally into the powder sifter 3.

[0056] Furthermore, the powder sifter 3 also includes an air pipe 31, one end of which is connected to the interior of the powder sifter 3 and the other end is connected to the air pump 4. A pressure controller 32 and a solenoid valve 35 are suitable for detecting the pressure within the powder sifter 3 to control the gas flow rate within the air pipe 31. By providing the air pipe 31 within the powder sifter 3 and integrating the pressure controller 32 and the solenoid valve 35, dynamic regulation of the air pressure within the screening chamber is achieved, and pressure changes within the powder sifter 3 are monitored in real time. When an abnormal increase in pressure due to material flow or vibration is detected, the solenoid valve 35 automatically adjusts the gas flow rate within the air pipe 31 to quickly balance the internal and external pressure differences, effectively preventing dust splashing caused by positive pressure or screen clogging caused by negative pressure.

[0057] Furthermore, the powder screening machine 3 also includes: a connecting device 33, and the discharge barrel 5 and the powder screening machine 3 are connected in sequence through the connecting device 33 and the rotating interface 34. By adding a connecting device 33 between the discharge barrel 5 and the powder screening machine 3, and using it in conjunction with the rotating interface 34, the connecting device 33 can effectively absorb the displacement caused by the vibration of the powder screening machine 3, avoid deformation and leakage of the interface caused by the rigid connection, and reduce dust flying. After being combined with the rotating interface 34, the connecting device 33 first performs a primary buffering of the impact force of the discharge, and the rotating interface 34 then accurately controls the discharge speed through dynamic sealing to improve work efficiency. The connecting device 33 is specifically a vent pipe 31, which provides a buffer for the material.

[0058] In some embodiments, combined Figure 3 As shown, the rotary interface 34 also includes a push rod 341 connected to the sealing plate 343. Pushing push rod 341 is suitable for controlling the rotation of the sealing plate 343. By incorporating push rod 341 into the rotary interface 34, mechanical control of the opening and closing degree of the sealing plate 343 is achieved, improving the convenience and reliability of seal adjustment. The rotation angle of the sealing plate 343 can be controlled by pushing push rod 341 without directly contacting the sealing part. This not only avoids the common problems of manual adjustment such as jamming or overtightening, but also enables real-time adjustment of material flow during equipment operation.

[0059] Optionally, an elastic shock-absorbing pad, made of high-damping rubber material, is installed between the frame 1 and the sifter 3, covering the contact surface between the frame 1 and the sifter 3. The rotary interface 34 of the sifter 3 retains its original structure, but a spiral adjustment mechanism is added to the closing plate 343 for fine-tuning the locking position of the opening. The elastic shock-absorbing pad absorbs the vibration energy of the sifter 3, reducing the resonance of the frame 1, further reducing the risk of seal failure caused by vibration. The spiral adjustment mechanism enables more precise adjustment of the opening of the closing plate 343 to adapt to different powder flow rate requirements and improve the stability of the dynamic seal.

[0060] According to an embodiment of the present invention, on the other hand, a method for using a vibrating screening device for preventing powder leakage is provided, which is applied to the vibrating screening device for preventing powder leakage described above, comprising:

[0061] Open the pressure controller 32 and the solenoid valve 35 to monitor the gas pressure in the powder sifter 3 in real time;

[0062] The opening of the rotary interface 34 is adjusted in a timely manner according to the different characteristics of the powder;

[0063] The gas pressure in the powder sifting machine 3 is maintained within a preset range until the powder sifting operation is completed.

[0064] The present invention provides a method for using a vibrating screening device to prevent powder leakage, achieving full-process powder leakage prevention through intelligent air pressure management and dynamic sealing adjustment. A pressure controller 32 and solenoid valve 35 monitor the internal air pressure of the sifter 3 in real time, automatically adjusting the output of the air pump 4 to maintain the optimal operating pressure range. This effectively suppresses dust escape caused by pressure fluctuations. The opening of the rotary interface 34 is precisely adjusted according to the material's characteristics via a push rod 341, ensuring optimal sealing and flow efficiency for powders with varying physical properties.

[0065] In some embodiments, the gas pressure in the powder sifter 3 is monitored in real time, including: when the gas pressure in the powder sifter 3 is lower than the preset minimum pressure, the pressure sensor transmits an open signal, and the solenoid valve 35 opens to replenish gas; when the gas pressure in the powder sifter 3 is higher than the preset maximum pressure, the pressure sensor transmits a close signal, and the solenoid valve 35 cuts off the gas supply.

[0066] The present invention regulates the internal air pressure of the powder sifter 3 through the coordinated control of a pressure sensor and a solenoid valve 35, ensuring that the sieving process is always performed under the optimal pressure. When the pressure sensor detects that the air pressure falls below a preset lower limit, the solenoid valve 35 is immediately triggered to open and replenish air; when the air pressure exceeds the upper limit, the air supply is quickly cut off. This eliminates the dust spraying or suction caused by pressure fluctuations in traditional equipment and reduces dust escape.

[0067] It is worth noting that the gas introduced is nitrogen. After the pressure controller 32 detects that the nitrogen pressure is stable at 2-4 kg, the nitrogen is input into the screening equipment through the two-position two-normally closed solenoid valve 35.

[0068] Furthermore, when the inner cavity pressure is lower than 2 kg, the pressure controller 32 sends an opening signal, and the electromagnetic valve 35 opens to replenish nitrogen. When the pressure rises to 4 kg, the pressure controller 32 sends a closing signal, and the electromagnetic valve 35 cuts off the nitrogen supply.

[0069] In some embodiments, before opening the pressure controller 32 and the solenoid valve 35, the following steps are also included: assembling a vibrating screening device to prevent powder leakage; turning on the air pump 4 and adjusting the rotary interface 34 to the open state. Through standardized equipment assembly and startup processes, it is ensured that the vibrating screening device has the best anti-leakage performance from the initial stage. Before the formal screening, the assembly of key components including the air pump 4 and the rotary interface 34 is completed first, so that each sealing structure reaches the best matching state. When starting, first run the air pump 4 to establish a basic air pressure environment, and then adjust the rotary interface 34 to the standard open state, so that the equipment forms a stable dust barrier before feeding.

[0070] After the powder screening operation is complete, the rotary interface 34 is adjusted to the closed position. This immediate closing of the rotary interface 34 after the screening operation achieves dust sealing management throughout the entire process, avoiding the material leakage problems that occur during the downtime of traditional equipment. The operator uses the push rod 341 to quickly reset the sealing plate 343 of the rotary interface 34. Combined with the elastic sealing effect of the rubber ring 342, a mechanical seal barrier is formed at the interface.

[0071] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A vibration screening device for preventing powder leakage, characterized in that: include: Framework (1); A powder sifting machine (3) is arranged in the frame (1), the frame (1) provides support for the powder sifting machine (3), the powder sifting machine (3) comprises a pressure controller (32), a solenoid valve (35) and a rotary interface (34), the pressure controller (32) and the solenoid valve (35) are arranged in the air pipeline of the powder sifting machine (3), and the rotary interface (34) is arranged at the inlet and outlet of the material of the powder sifting machine (3); The rotating interface (34) includes a rubber ring (342), a closing plate (343) and an interface body (344); the closing plate (343) is arranged in the interface body (344); the rubber ring (342) is arranged between the closing plate (343) and the interface body (344); the closing plate (343) is suitable for rotating to adjust the opening degree of the interface body (344); and the rubber ring (342) is suitable for making the closing plate (343) and the interface body (344) fit tightly.

2. The vibration screening device for preventing powder leakage according to claim 1, characterized in that: Also includes: A loading barrel (2) and a lower loading barrel (5), wherein the loading barrel (2) is arranged at the upper entrance of the powder sifting machine (3), and the lower loading barrel (5) is arranged at the outlet of the powder sifting machine (3); and the rotary interface (34) is respectively arranged between the loading barrel (2) and the powder sifting machine (3) and between the lower loading barrel (5) and the powder sifting machine (3).

3. The vibration screening device for preventing powder leakage according to claim 2, characterized in that: The powder sifting machine (3) further comprises: an air pipe (31), one end of which is in communication with the interior of the powder sifting machine (3); the pressure controller (32) and the solenoid valve (35) are adapted to detect the pressure in the powder sifting machine (3) so as to control the gas flow rate in the air pipe (31).

4. The vibration screening device for preventing powder leakage according to claim 3, characterized in that: The rotation interface (34) further comprises a push rod (341), wherein the push rod (341) is connected to the closing plate (343), and pushing the push rod (341) is suitable for controlling the rotation of the closing plate (343).

5. The vibration screening device for preventing powder leakage according to claim 3, characterized in that: The powder screening machine (3) further comprises: a connecting device (33); the discharge barrel (5) and the powder screening machine (3) are connected in sequence via the connecting device (33) and the rotary interface (34).

6. The vibration screening device for preventing powder leakage according to claim 3, characterized in that: Also includes: An air pump (4), the other end of the air pipe (31) is connected to the air pump (4).

7. A method for using a vibrating screening device for preventing powder leakage, applied to the vibrating screening device for preventing powder leakage according to claims 1 to 6, characterized in that: include: Open the pressure controller (32) and the electromagnetic valve (35) to monitor the gas pressure in the powder sifter (3) in real time; The opening of the rotary interface (34) is adjusted in due time according to the different characteristics of the powder; The gas pressure in the powder screening machine (3) is maintained within a preset range until the powder screening operation is completed.

8. The method for using the vibration screening device for preventing powder leakage according to claim 7, characterized in that: The real-time monitoring of the gas pressure in the powder sifter (3) comprises: When the gas pressure in the powder sifting machine (3) is lower than the preset minimum pressure value, the pressure sensor transmits an open signal, and the electromagnetic valve (35) opens to replenish gas. When the gas pressure in the powder sifting machine (3) is higher than the preset maximum pressure value, the pressure sensor transmits a close signal, and the electromagnetic valve (35) cuts off the gas supply.

9. The method for using the vibration screening device for preventing powder leakage according to claim 7, characterized in that: Before the pressure controller (32) and the solenoid valve (35) are opened, the following further comprises: Assemble a vibrating screening device to prevent powder leakage; Turn on the air pump (4) and adjust the rotary interface (34) to the open state.

10. The method for using the vibration screening device for preventing powder leakage according to claim 8, characterized in that: After the powder screening operation is completed, the process includes: adjusting the rotary interface (34) to a closed state.

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