Anti-blocking type negative pressure vibrating screen

Abstract

The utility model belongs to the technical field of vibrating screens, and discloses an anti-blocking type negative pressure vibrating screen which is provided with an anti-blocking mechanism, the anti-blocking mechanism comprises a lifting driving assembly and a jacking assembly, the lifting driving assembly automatically drives the jacking assembly to reciprocate up and down in the vertical direction, and the jacking assembly periodically vibrates a screen mesh. Due to the fact that the anti-blocking mechanism can automatically clean and vibrate the screen mesh in real time, material particles can be effectively prevented from being clamped on the screen mesh, the surface of the screen mesh is kept in a smooth state all the time, the screening efficiency is improved, and especially when viscous or easily-blocked materials are treated, the performance is more remarkable. In addition, the anti-blocking mechanism can effectively reduce the number of production halts caused by blocking of the screen mesh, the work of manually cleaning the screen mesh is omitted, the maintenance and operation difficulty is reduced, the continuous working time of the negative pressure vibrating screen is prolonged, and the overall production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibrating screens, in particular to an anti-blocking negative pressure vibrating screen. Background Art

[0002] A negative pressure vibrating screen is a device that combines negative pressure and vibration screening technologies. It utilizes negative pressure (vacuum) and vibration to screen, dry, and remove impurities from materials. This equipment is suitable for processing powdered and granular materials. As the first-level solids control equipment for drilling fluid and its most important purification device, the negative pressure vibrating screen is responsible for separating cuttings from the drilling fluid. By installing a negative pressure adsorption device beneath the last screen of the vibrating screen, vacuum adsorption of drilling fluid before cuttings discharge is achieved, thereby improving overall drilling efficiency.

[0003] However, when the negative pressure vibrating screen machine is working, the mud is poured onto the screen, and the negative pressure vibrating screen machine drives the screen to vibrate, so that the screen separates the mud. A negative pressure mechanism is set under the screen to suck the mud on the screen into the negative pressure chamber. When the negative pressure chamber sucks the mud, some particles will be stuck on the screen, resulting in a decrease in the screening efficiency of the screen. It is necessary to manually shut down the vibrating screen machine and then use other tools to pick out the particles, but frequent shutdowns may affect the working efficiency of the vibrating screen machine. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-blocking negative pressure vibrating screen, which can effectively prevent particles from getting stuck on the screen, keep the screen unobstructed, improve screening efficiency, reduce shutdown frequency, and improve overall production efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The anti-blocking negative pressure vibrating screen comprises a vibrating screen machine, a screen mesh and a negative pressure chamber, wherein the screen mesh is arranged on the vibrating screen machine, and the negative pressure chamber is located below the screen mesh, wherein the anti-blocking negative pressure vibrating screen further comprises:

[0007] An anti-blocking mechanism is arranged in the negative pressure chamber and is located below the screen. The anti-blocking mechanism includes a lifting drive assembly and a support assembly. The output end of the lifting drive assembly is connected to the support assembly, and the support assembly abuts against the screen. The lifting drive assembly can drive the support assembly to reciprocate up and down in the vertical direction, so as to periodically vibrate the screen.

[0008] Furthermore, the anti-blocking mechanism is placed close to the inner wall of the negative pressure chamber.

[0009] Furthermore, the lifting drive assembly includes a first drive member and a transmission member, the output end of the first drive member is connected to the first end of the transmission member, the second end of the transmission member is abutted against the top support assembly, and the first drive member can drive the transmission member to drive the top support assembly to move.

[0010] Furthermore, the top support assembly includes a sliding support, a first sealing rod and a top support. The sliding support is arranged in the negative pressure chamber, the bottom of the sliding support is abutted against the second end of the transmission member, and the top of the sliding support is provided with the first sealing rod; the first sealing rod passes through the top wall of the negative pressure chamber and maintains a sliding and sealing connection with the top wall of the negative pressure chamber. The end of the first sealing rod away from the sliding support is connected to the top support, and the top support is abutted against the screen.

[0011] Furthermore, the anti-blocking mechanism also includes a limiting assembly, which includes a first limiting plate. The first limiting plate is arranged on the bottom wall of the negative pressure chamber and is located below the sliding support member to limit the up and down movement distance of the sliding support member.

[0012] Furthermore, the limiting assembly also includes two guide members, which are arranged relatively to each other on the bottom wall of the negative pressure chamber in a vertical direction, and the sliding support member slides with the guide members to limit the movement of the sliding support member in the vertical direction.

[0013] Furthermore, the anti-blocking negative pressure vibrating screen also includes a cleaning component and a transmission pipe. The cleaning component is arranged on a side of the negative pressure chamber close to the anti-blocking mechanism, and one end of the transmission pipe is connected to the bottom wall of the negative pressure chamber away from the anti-blocking mechanism. The cleaning component can move along the anti-blocking mechanism toward the transmission pipe so as to push the mud on the bottom wall of the negative pressure chamber into the transmission pipe.

[0014] Furthermore, the cleaning assembly includes a cleaning piece and a second sealing rod, the cleaning piece is slidably connected to the bottom wall of the negative pressure chamber, one end of the second sealing rod is connected to the cleaning piece, and the other end of the second sealing rod passes through the side wall of the negative pressure chamber opposite to the anti-blocking mechanism, the second sealing rod maintains a sliding sealing connection with the side wall of the negative pressure chamber, and the second sealing rod can drive the protected cleaning piece (51) to move.

[0015] Furthermore, the cleaning assembly further includes a second driving member, and an output end of the second driving member is connected to one end of the second sealing rod passing through the side wall of the negative pressure chamber to drive the second sealing rod to move.

[0016] Furthermore, the anti-blocking negative pressure vibrating screen also includes a vacuum machine, and the end of the transmission pipe away from the negative pressure chamber is connected to the vacuum machine.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides an anti-blocking negative pressure vibrating screen, which is equipped with an anti-blocking mechanism, wherein the anti-blocking mechanism includes a lifting drive assembly and a top support assembly, the lifting drive assembly automatically drives the top support assembly to reciprocate up and down in the vertical direction, and the top support assembly periodically vibrates the screen. Since the anti-blocking mechanism can automatically clean and vibrate the screen in real time, it can effectively prevent material particles from getting stuck on the screen, so that the screen surface remains unobstructed at all times, thereby improving screening efficiency, especially when processing sticky or easily blocked materials, the performance is more significant; the anti-blocking mechanism can also effectively reduce the number of production shutdowns caused by screen blockage, eliminates the work of manual cleaning of the screen, reduces maintenance and operation difficulty, extends the continuous working time of the negative pressure vibrating screen, and improves overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an anti-blocking negative pressure vibrating screen of the utility model from one angle;

[0020] Figure 2 This is a structural diagram of the utility model's anti-blocking negative pressure vibrating screen from another angle;

[0021] Figure 3 It is a schematic structural diagram of the interior of the negative pressure chamber of the present invention;

[0022] Figure 4 It is a structural diagram of the anti-blocking mechanism of the utility model;

[0023] Figure 5 It is a structural diagram of the transmission part of the utility model.

[0024] In the picture:

[0025] 1. Vibrating screen; 2. Screen; 3. Negative pressure chamber;

[0026] 4. Anti-blocking mechanism; 41. Lifting drive assembly; 411. First driving member; 412. Transmission member; 4121. Transmission rod; 4122. Turntable; 4123. Rotating arm; 4124. Push rod;

[0027] 42. Top support assembly; 421. Sliding support member; 422. First sealing rod; 423. Top support member;

[0028] 43. Limiting assembly; 431. First limiting plate; 432. Guide member; 433. Limiting sleeve;

[0029] 5. Cleaning assembly; 51. Cleaning member; 52. Second sealing rod; 53. Second driving member; 531. Electric push rod; 532. Sliding push plate; 533. Slide rail; 6. Transfer tube; 7. Vacuum machine. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] Please refer to Figures 1 to 5As shown, the utility model provides an anti-blocking negative pressure vibrating screen, which can effectively prevent particles from getting stuck on the screen 2, keep the screen 2 unobstructed, improve screening efficiency, reduce shutdown frequency, and improve overall production efficiency. The anti-blocking negative pressure vibrating screen includes a vibrating screen machine 1, a screen 2, a negative pressure chamber 3 and an anti-blocking mechanism 4. The screen 2 is arranged on the vibrating screen machine 1, and the negative pressure chamber 3 is located below the screen 2. The anti-blocking mechanism 4 is arranged in the negative pressure chamber 3 and is located below the screen 2. The anti-blocking mechanism 4 includes a lifting drive assembly 41 and a top support assembly 42. The output end of the lifting drive assembly 41 is connected to the top support assembly 42, and the top support assembly 42 abuts against the screen 2. The lifting drive assembly 41 can drive the top support assembly 42 to reciprocate up and down in the vertical direction for periodically vibrating the screen 2.

[0035] By setting up an anti-blocking mechanism 4, the anti-blocking mechanism 4 is set in the negative pressure chamber 3 and is located below the screen 2, wherein the anti-blocking mechanism 4 includes a lifting drive component 41 and a support component 42, the lifting drive component 41 drives the support component 42 to reciprocate up and down in the vertical direction, and the support component 42 periodically vibrates the screen 2, which can effectively prevent material particles from getting stuck on the screen 2. Since the anti-blocking mechanism 4 can automatically clean and vibrate the screen 2 in real time, the surface of the screen 2 is always kept unobstructed, thereby improving the screening efficiency, especially when dealing with sticky or easily blocked materials, the performance is more significant; the anti-blocking mechanism 4 can also effectively reduce the number of production shutdowns caused by blockage of the screen 2, eliminating the work of manually cleaning the screen 2, reducing the difficulty of maintenance and operation, extending the continuous working time of the negative pressure vibrating screen, and improving the overall production efficiency.

[0036] It should be noted that the “vertical direction” defined herein refers to the vertical direction along the inner wall of the negative pressure chamber 3 ; the “horizontal direction” defined herein refers to the horizontal direction along the inner wall of the negative pressure chamber 3 .

[0037] like Figure 3 As shown, in order to improve the utilization rate of the internal space of the negative pressure chamber 3, in some embodiments, the anti-blocking mechanism 4 is placed close to the inner wall of the negative pressure chamber 3. This design can effectively utilize the internal space of the negative pressure chamber 3 without occupying too much space near the screen 2, maintaining the smoothness of material flow, and at the same time helping to firmly install the anti-blocking mechanism 4, reducing the vibration or displacement of the anti-blocking mechanism 4 when the anti-blocking negative pressure vibrating screen is running, and ensuring the stability and long-term effectiveness of the anti-blocking function.

[0038] like Figure 4As shown, in some embodiments, the lifting drive assembly 41 includes a first drive member 411 and a transmission member 412. The output end of the first drive member 411 is connected to the first end of the transmission member 412, and the second end of the transmission member 412 is in contact with the top support assembly 42. The first drive member 411 can drive the transmission member 412 to drive the top support assembly 42 to move. Through the combination of the first drive member 411 and the transmission member 412, stable power transmission can be achieved. The transmission member 412 serves as an intermediate conversion device for the driving force, so that the power can be flexibly transmitted to the top support assembly 42, adapting to complex equipment structures or narrow spaces, and improving the flexibility of the layout. Figure 5 As shown, specifically, the transmission member 412 includes a transmission rod 4121, a turntable 4122, a rotating arm 4123 and a push rod 4124. One end of the transmission rod 4121 is connected to the output end of the first driving member 411, and the other end of the transmission member 412 is connected to the turntable 4122. The central axis of the turntable 4122 is arranged in the horizontal direction. One end of the rotating arm 4123 is hinged to a position close to the edge of the turntable 4122, and the other end of the rotating arm 4123 is hinged to the push rod 4124. The end of the push rod 4124 away from the rotating arm 4123 is in contact with the top support assembly 42. The transmission rod 4121 can drive the turntable 4122 to rotate along its central axis direction, and the turntable 4122 can drive the push rod 4124 to reciprocate up and down in the vertical direction through the rotating arm 4123. It is understood that the connection design between the transmission rod 4121, the turntable 4122, and the rotating arm 4123 can realize the conversion of driving force between the horizontal direction and the vertical direction, so that the entire anti-blocking mechanism 4 can flexibly adapt to different installation spaces and layout methods, improve the adaptability of the structure, avoid the complexity of direct drive, simplify the mechanical structure, and ensure smooth up and down movement through the smooth transmission of the turntable 4122 and the rotating arm 4123, reduce the vibration load of the equipment, improve the stability of the system and extend the service life. The transmission rod 4121 can be, but is not limited to, a worm gear or a ball screw, etc., and is not specifically limited here.

[0039] Continue as Figure 4As shown, in order to ensure the sealing of the negative pressure chamber 3, in some embodiments, the supporting assembly 42 includes a sliding support member 421, a first sealing rod 422 and a supporting member 423. The sliding support member 421 is arranged in the negative pressure chamber 3, and the bottom of the sliding support member 421 abuts against the second end of the transmission member 412. The top of the sliding support member 421 is provided with a first sealing rod 422; the first sealing rod 422 passes through the top wall of the negative pressure chamber 3 and maintains a sliding sealing connection with the top wall of the negative pressure chamber 3. The first sealing rod 422 The end away from the sliding support member 421 is connected to a supporting member 423, which abuts against the screen 2; the first sealing rod 422 penetrates the top wall of the negative pressure chamber 3 and is slidably and sealedly connected to the top wall of the negative pressure chamber 3, so that the sealing state of the negative pressure chamber 3 can be maintained while the supporting assembly 42 moves up and down, ensuring that the negative pressure environment is not destroyed, thereby improving the screening effect; the sliding support member 421 is connected to the transmission member 412, which can smoothly transmit power and ensure that the supporting member 423 can move up and down smoothly. Specifically, in order to increase the stability of the anti-blocking mechanism 4 structure, the sliding support member 421 can be set as a sliding plate, and the top support member 423 can be set as a top support plate. The sliding plate is arranged parallel to the bottom wall of the negative pressure chamber 3, and both ends of the sliding plate are slidably connected to the inner wall of the negative pressure chamber 3. A first sealing rod 422 is symmetrically arranged on the sliding plate along its length direction, and the first sealing rod 422 is connected to the top support plate at one end away from the sliding plate, and the top support plate is arranged parallel to the screen 2. By setting the sliding plate parallel to the bottom wall of the negative pressure chamber 3 and slidingly connecting the two ends with the inner wall, the overall structure is more stable, reducing the shaking or tilting problems that may be caused by single-point support, and symmetrically arranging the first sealing rod 422 on the sliding plate can distribute the force more evenly, and at the same time realize a smooth sliding sealing connection between the first sealing rod 422 and the top wall of the negative pressure chamber 3, thereby improving the overall sealing effect of the negative pressure chamber 3, and the top support plate is arranged parallel to the screen 2, which can contact the screen 2 over a larger area, which is conducive to uniformly transmitting vibration force.

[0040] like Figure 4As shown, in order to control the range of movement of the anti-blocking assembly, in some embodiments, the anti-blocking mechanism 4 also includes a limit assembly 43, which includes a first limit plate 431. The first limit plate 431 is arranged on the bottom wall of the negative pressure chamber 3 and is located below the sliding support 421 to limit the up and down movement distance of the sliding support 421. Among them, the first limit plate 431 can effectively limit the up and down movement distance of the sliding support 421, ensuring that its range of movement is within the design predetermined value, thereby avoiding structural damage or failure caused by excessive movement; by limiting the range of movement of the sliding support 421, it is ensured that it operates within an appropriate vibration amplitude, so that the support assembly 42 can vibrate the screen 2 at the optimal frequency and amplitude, thereby improving the screening effect and anti-blocking efficiency. Among them, the transmission rod 4121 can be arranged through the first limit plate 431, and the presence of the first limit plate 431 can limit the shaking of the transmission rod 4121 and ensure the stability of the structure. Furthermore, the limiting assembly 43 also includes two guide members 432, which are arranged relatively to each other on the bottom wall of the negative pressure chamber 3 in the vertical direction, and the sliding support member 421 slides with the guide member 432 to limit the movement of the sliding support member 421 in the vertical direction; through the sliding cooperation between the guide member 432 and the sliding support member 421, the movement trajectory of the sliding support member 421 can be limited to precise movement in the vertical direction, avoiding deviation or shaking caused by unstable movement, and improving the stability of the overall structure; the guide member 432 can be a guide groove or a slide rail 533, etc., which is not specifically limited here. Furthermore, the limiting assembly 43 also includes a limiting sleeve 433, which is fixedly connected to the anti-blocking mechanism 4 and can be sleeved on the outside of the push rod 4124. The push rod 4124 can move back and forth in the vertical direction inside the limiting sleeve 433, wherein the limiting sleeve 433 can effectively guide the up and down movement of the push rod 4124, limit the maximum movement range of the push rod 4124, and ensure its precise movement trajectory in the vertical direction.

[0041] Combine Figure 1 and Figure 3As shown, in order to further improve the working efficiency of the anti-blocking negative pressure vibrating screen, in some embodiments, the anti-blocking negative pressure vibrating screen also includes a cleaning component 5 and a transmission pipe 6. The cleaning component 5 is arranged on the side of the negative pressure chamber 3 close to the anti-blocking mechanism 4, and one end of the transmission pipe 6 is connected to the bottom wall of the negative pressure chamber 3 away from the anti-blocking mechanism 4. The cleaning component 5 can move along the anti-blocking mechanism 4 toward the transmission pipe 6 so as to push the mud on the bottom wall of the negative pressure chamber 3 into the transmission pipe 6; wherein in the anti-blocking negative pressure vibrating screen, after screening the mud, the mud will flow into the negative pressure chamber 3. The setting of the cleaning component 5 can enable the mud deposited on the bottom wall to be pushed into the transmission pipe 6 in time, thereby improving the working efficiency of the anti-blocking negative pressure vibrating screen; by arranging the cleaning component 5 on the side close to the anti-blocking mechanism 4 and the connection design of the transmission pipe 6 and the bottom wall of the negative pressure chamber 3 away from the anti-blocking mechanism 4, the cleaning area of ​​the cleaning component 5 can cover the entire bottom wall of the negative pressure chamber 3 as much as possible, and the mud accumulated on the bottom wall of the negative pressure chamber 3 can be quickly cleaned.

[0042] Combine Figure 2 and Figure 3 As shown, specifically, the cleaning assembly 5 includes a cleaning member 51 and a second sealing rod 52. The cleaning member 51 is slidably connected to the bottom wall of the negative pressure chamber 3. One end of the second sealing rod 52 is connected to the cleaning member 51, and the other end of the second sealing rod 52 penetrates the side wall of the negative pressure chamber 3 opposite the anti-blocking mechanism 4. The second sealing rod 52 maintains a sliding and sealing connection with the side wall of the negative pressure chamber 3, and the second sealing rod 52 can drive the protected cleaning member 51 to move; one end of the second sealing rod 52 is connected to the cleaning member 51, and the other end penetrates the side wall of the negative pressure chamber 3, which can effectively drive the cleaning member 51 to move, simplifying the cleaning operation. The second sealing rod 52 maintains a sliding and sealing connection with the side wall of the negative pressure chamber 3, which can effectively prevent the leakage of gas and liquid, ensure that the negative pressure state in the negative pressure chamber 3 is not affected, and maintain the normal operation of the device. The combined design of the cleaning member 51 and the second sealing rod 52 can achieve cleaning and sealing functions without taking up additional space, optimizing the internal structural layout of the device. Among them, the cleaning member 51 can be, but is not limited to, a cleaning plate or a cleaning brush, etc., which is not specifically limited here.

[0043] In some embodiments, the cleaning assembly 5 also includes a second driving member 53, the output end of the second driving member 53 is connected to the end of the second sealing rod 52 that passes through the side wall of the negative pressure chamber 3 to drive the second sealing rod 52 to move; the second driving member 53 can accurately control the movement distance and speed of the second sealing rod 52, thereby optimizing the cleaning effect, ensuring that the cleaning member 51 can effectively cover the bottom wall of the negative pressure chamber 3, improving the thoroughness of cleaning, and reducing the need for manual operation, thereby improving work efficiency. Specifically, the second driving member 53 includes an electric push rod 531 and a sliding push plate 532, the output end of the electric push rod 531 is connected to the sliding push plate 532, and the sliding push plate 532 is connected to the end of the second sealing rod 52 that passes through the side wall of the negative pressure chamber 3; the electric push rod 531 pushes the sliding push plate 532, which can provide precise displacement control, facilitate automated operation, reduce manual intervention, and improve efficiency and operational accuracy. Two second sealing rods 52 can be provided, symmetrically arranged on the cleaning member 51 and the sliding push rod 4124. This allows for more even force distribution and reduces displacement, wear, or structural deformation caused by excessive force on one side. Furthermore, a slide rail 533 is provided at the bottom of the sliding push rod 4124. The slide rail 533 is connected to the side wall of the negative pressure chamber 3 and extends along the direction of movement of the second sealing rod 52. The sliding push rod 4124 is slidably connected to the slide rail 533, further ensuring the smooth movement of the sliding push rod 4124.

[0044] like Figure 2 As shown, in some embodiments, the anti-blocking negative pressure vibrating screen further includes a vacuum machine 7, and the end of the transmission pipe 6 away from the negative pressure chamber 3 is connected to the vacuum machine 7. Through the action of the vacuum machine 7, the strong negative pressure formed in the negative pressure chamber 3 can effectively suck away the fine particles passing through the screen 2, avoiding the problem of material retention or clogging on the screen 2, reducing the risk of clogging of the screen holes, and thus improving the patency and efficiency of screening. Specifically, the vacuum machine 7 can use a variable frequency vacuum machine 7, which can flexibly adjust the output pressure to ensure that the negative pressure chamber 3 can maintain the optimal negative pressure level under different screening conditions.

[0045] In some embodiments, sealing rings are provided between the first sealing rod 422 and the top wall of the negative pressure chamber 3 and between the second sealing rod 52 and the side wall of the negative pressure chamber 3, which can better ensure the stability of the internal pressure of the negative pressure chamber 3. The sealing rings can be but are not limited to silicone rings, etc., and are not specifically limited here.

[0046] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An anti-blocking negative pressure vibrating screen, comprising a vibrating screen machine (1), a screen (2) and a negative pressure chamber (3), wherein the screen (2) is arranged on the vibrating screen machine (1), and the negative pressure chamber (3) is located below the screen (2), characterized in that: The anti-blocking negative pressure vibrating screen also includes: An anti-blocking mechanism (4) is provided in the negative pressure chamber (3) and is located below the screen (2). The anti-blocking mechanism (4) comprises a lifting drive assembly (41) and a supporting assembly (42). The output end of the lifting drive assembly (41) is connected to the supporting assembly (42). The supporting assembly (42) abuts against the screen (2). The lifting drive assembly (41) can drive the supporting assembly (42) to reciprocate up and down in a vertical direction, so as to periodically vibrate the screen (2).

2. The anti-blocking negative pressure vibrating screen according to claim 1, characterized in that: The anti-blocking mechanism (4) is placed in close contact with the inner wall of the negative pressure chamber (3).

3. The anti-blocking negative pressure vibrating screen according to claim 2, characterized in that: The lifting drive assembly (41) includes a first driving member (411) and a transmission member (412), wherein the output end of the first driving member (411) is connected to the first end of the transmission member (412), and the second end of the transmission member (412) is in contact with the supporting assembly (42), and the first driving member (411) can drive the transmission member (412) to drive the supporting assembly (42) to move.

4. The anti-blocking negative pressure vibrating screen according to claim 3, characterized in that: The supporting assembly (42) includes a sliding support member (421), a first sealing rod (422) and a supporting member (423), wherein the sliding support member (421) is arranged in the negative pressure chamber (3), the bottom of the sliding support member (421) is in contact with the second end of the transmission member (412), and the top of the sliding support member (421) is provided with the first sealing rod (422); the first sealing rod (422) passes through the top wall of the negative pressure chamber (3) and maintains a sliding sealing connection with the top wall of the negative pressure chamber (3), and the end of the first sealing rod (422) away from the sliding support member (421) is connected to the supporting member (423), and the supporting member (423) is in contact with the screen (2).

5. The anti-blocking negative pressure vibrating screen according to claim 4, characterized in that: The anti-blocking mechanism (4) further includes a limiting assembly (43), wherein the limiting assembly (43) includes a first limiting plate (431), wherein the first limiting plate (431) is arranged on the bottom wall of the negative pressure chamber (3) and is located below the sliding support member (421) to limit the vertical movement distance of the sliding support member (421).

6. The anti-blocking negative pressure vibrating screen according to claim 5, characterized in that: The limiting assembly (43) further includes two guide members (432), which are arranged on the bottom wall of the negative pressure chamber (3) in a vertical direction relative to each other, and the sliding support member (421) slides with the guide members (432) to limit the movement of the sliding support member (421) in the vertical direction.

7. The anti-blocking negative pressure vibrating screen according to claim 2, characterized in that: The anti-blocking negative pressure vibrating screen further comprises a cleaning component (5) and a transmission pipe (6), wherein the cleaning component (5) is arranged in the negative pressure chamber (3) on a side close to the anti-blocking mechanism (4), and one end of the transmission pipe (6) is connected to the bottom wall of the negative pressure chamber (3) away from the anti-blocking mechanism (4), and the cleaning component (5) can move along the anti-blocking mechanism (4) toward the transmission pipe (6) so as to push the mud on the bottom wall of the negative pressure chamber (3) into the transmission pipe (6).

8. The anti-blocking negative pressure vibrating screen according to claim 7, characterized in that: The cleaning assembly (5) includes a cleaning member (51) and a second sealing rod (52), wherein the cleaning member (51) is slidably connected to the bottom wall of the negative pressure chamber (3), one end of the second sealing rod (52) is connected to the cleaning member (51), and the other end of the second sealing rod (52) passes through the side wall of the negative pressure chamber (3) opposite to the anti-blocking mechanism (4), and the second sealing rod (52) maintains a sliding and sealing connection with the side wall of the negative pressure chamber (3), and the second sealing rod (52) can drive the protected cleaning member (51) to move.

9. The anti-blocking negative pressure vibrating screen according to claim 8, characterized in that: The cleaning assembly (5) further comprises a second driving member (53), the output end of the second driving member (53) being connected to one end of the second sealing rod (52) penetrating the side wall of the negative pressure chamber (3) to drive the second sealing rod (52) to move.

10. The anti-blocking negative pressure vibrating screen according to any one of claims 7 to 9, characterized in that: The anti-blocking negative pressure vibrating screen further comprises a vacuum machine (7), and one end of the transmission pipe (6) away from the negative pressure chamber (3) is connected to the vacuum machine (7).

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