Square plansifter with pneumatic top grid adjusting device

Abstract

The utility model discloses a square plansifter with a pneumatic adjusting top grid device, which belongs to the field of plansifts.The square plansifter comprises a sifter box, sifter grids are arranged in the sifter box, a sifter top grid is arranged above the sifter grids, and the pneumatic adjusting top grid device is arranged above the sifter top grid; the pneumatic top grid adjusting device comprises two air cylinders, and working rods of the air cylinders are arranged in adjusting grooves in the two ends of the screen top grid. The screen top lattice compresses the screen lattice through air pressure, the screen top lattice continuously bears force on the screen lattice, the sealing effect is better, maintenance is convenient, the maintenance frequency is reduced, and the maintenance cost is saved; the stress point of the air cylinder directly acts on the screen top grid, the structure is compact, stress is reasonable, and the strength of the screen top grid is high. A speed regulating valve is arranged in an air channel, the extending speed of each air cylinder can be regulated, and it is guaranteed that the top grid moves in the vertical direction; a one-way valve is arranged, and the sealing effect can still be achieved within hours after gas supply is stopped; by arranging the mistake-proof structure, the situation that the screen top case moves upwards to loosen the screen case when the valve switch is touched by mistake can be prevented.

Description

Technical Field

[0001] This utility model relates to the field of high-square flat screens, and in particular to a high-square flat screen with a pneumatic adjustment top grid device. Background Technology

[0002] The Gaofang flat screen is a device that uses a self-balancing drive to form a horizontal gyratory motion for material screening. The screen grids arranged in layers inside the screen box need to be reliably pressed together by a clamping mechanism to ensure a tight fit between the screen grids and prevent material leakage.

[0003] The high-square flat screen is one of the main pieces of equipment in the wheat milling industry. It is mainly used for sieving and grading after grinding, and can also be used as an inspection screen. The screen grid is one of the main components of the high-square flat screen. The grading and sieving of materials are all carried out through the screen grid. The premise for the screen grid to work normally is to ensure good sealing performance between the screen grid channels.

[0004] Currently, the main method for clamping the screen grids of high-square flat screens is to use two screws that press down from the top wall of the screen box onto both sides of the top screen grid. The pressure is transmitted downwards through each screen grid to achieve a clamping effect on the entire screen stack. The disadvantage of this method is that the screen body is suspended at four corners and is located at a high position, while the clamping screws are located at the top of the screen body and extend upwards. Therefore, when it is necessary to disassemble, repair, or replace the screen grids, the operators must climb to the top of the screen for high-altitude work, which is not only inconvenient and affects work efficiency, but also poses safety hazards. In addition, since the screen grids are prone to loosening during the movement of the screen body, the operators need to frequently inspect to ensure the reliability of the screen grid clamping. If the inspection is not timely, the screen grids will not be clamped tightly, resulting in material leakage, which will require the material to be re-screened, thus affecting production efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a high-square flat screen with a pneumatic adjustment top grid device, which solves the problem that the existing screen grid clamping structure is easy to loosen and inconvenient to maintain.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model discloses a high-square flat screen with a pneumatically adjustable top grid device, comprising a screen box, a screen grid inside the screen box, a top grid above the screen grid, and a pneumatically adjustable top grid device above the top grid. The pneumatically adjustable top grid device includes two cylinders, which are disposed on the top surface of the screen box. Adjustment grooves are provided at both ends of the top grid, and the working rods of the cylinders are disposed in the adjustment grooves.

[0008] Furthermore, a valve support is provided on the top surface of the screen box, a two-position five-way valve is provided on the top surface of the valve support, a valve switch is provided on one side of the two-position five-way valve, a protective cover is provided on the outside of the two-position five-way valve, the valve switch is located on the outside of the protective cover, and an anti-misoperation structure is also provided on the protective cover.

[0009] Furthermore, the error-proof structure includes an indicator arrow, which is disposed on the valve switch, and the protective cover is provided with a through hole that matches the cross-sectional shape of the indicator arrow.

[0010] Furthermore, the two cylinders are connected to the two-position five-way valve via a branch air pipe. The two-position five-way valve is equipped with a speed regulating valve. The two-position five-way valve is connected to the main air pipe, which is connected to an air source. The main air pipe is equipped with a one-way valve.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] This utility model's screen top grid relies on air pressure to press the screen grid together. During equipment operation, the screen top grid continuously exerts force on the screen grid, resulting in a better sealing effect, preventing loosening, facilitating maintenance, reducing maintenance frequency, and saving maintenance costs. The force point of the cylinder acts directly on the screen top grid, resulting in a compact structure, reasonable force distribution, and high screen top grid strength. The screen top grid is raised and lowered by the combined action of two cylinders, and a speed regulating valve is installed in the air circuit to adjust the extension speed of each cylinder, ensuring that the top grid moves in the vertical direction. A one-way valve is installed to maintain the sealing effect for up to 24 hours after the air supply stops. By incorporating an anti-misoperation structure, it is possible to prevent accidental valve switching from causing the screen top grid to move upward and loosen. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a front view of the high-square flat screen with pneumatic adjustment top grid device of this utility model;

[0015] Figure 2 This is a cross-sectional view of the top grid of the sieve of this utility model;

[0016] Figure 3 This is a cross-sectional view of the valve switch and error-proof structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the through hole structure of this utility model;

[0018] Figure 5 This is a side view of the indicator arrow of this utility model;

[0019] Figure 6 This is a diagram showing the gas path connection of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Screen box; 2. Screen grid; 3. Screen top grid; 4. Adjustment groove; 5. Cylinder; 6. One-way valve; 7. Speed ​​control valve; 8. Valve support; 9. Two-position five-way valve; 10. Valve switch; 11. Indicating arrow; 12. Protective cover; 1201. Through hole; 13. Main gas supply pipe; 14. Distribution gas supply pipe. Detailed Implementation

[0021] like Figure 1-6 As shown, a high-square flat screen with a pneumatically adjustable top grid device includes a screen box 1, a screen grid 2 installed inside the screen box 1, a screen top grid 3 installed above the screen grid 2, and a pneumatically adjustable top grid device installed above the screen top grid 3.

[0022] The pneumatic adjustment top grid device includes two cylinders 5, which are installed on the top surface of the screen box 1. Adjustment grooves 4 are provided at both ends of the screen top grid 3. The working rod of the cylinder 5 is connected in the adjustment groove 4. The force point of the cylinder acts directly on the screen top grid. The structure is compact, the force is reasonable, and the screen top grid has high strength. The screen top grid is pressed by air pressure. When the equipment is running, the screen top grid continuously exerts force on the screen grid, resulting in better sealing effect.

[0023] like Figure 4-5 As shown, a valve bracket 8 is bolted to the top surface of the sieve box 1. A two-position five-way valve 9 is connected to the top surface of the valve bracket 8. A valve switch 10 is connected to one side of the two-position five-way valve 9. A protective cover 12 is installed on the outside of the two-position five-way valve 9. The valve bracket 8 and the two-position five-way valve 9 are both located inside the protective cover 12. The valve switch 10 is located on the outside of the protective cover 12 for easy operation. The protective cover 12 is also equipped with an anti-misoperation structure.

[0024] The error prevention structure includes an indicator arrow 11, which is connected to the valve switch 10. The protective cover 12 has a through hole 1201 that matches the cross-sectional shape of the indicator arrow 11.

[0025] like Figure 6 As shown, the two cylinders 5 are connected to the two-position five-way valve 9 via the air distribution pipe 14; the two-position five-way valve 9 is equipped with a speed regulating valve 7; the two-position five-way valve 9 is connected to the main air pipe 13; the main air supply pipe 13 is connected to the air source, and a one-way valve 6 is installed on the main air supply pipe 13; the screen top grid 3 is raised and lowered by the joint action of the two cylinders 5. The speed regulating valve 7 in the air circuit can adjust the extension speed of each cylinder 5 by controlling the exhaust volume on the two-position five-way valve 9, ensuring that the top grid moves in the vertical direction; a special one-way valve 6 is set so that the gas can only flow from the main air source to the two-position five-way valve 9 and cannot flow in reverse. When the main air source pressure decreases or the air supply stops, it does not affect the sealing effect of the screen top grid. After testing, the sealing effect can still be met 16 hours after the air supply stops.

[0026] Pulling out valve switch 10 extends the working rod of cylinder 5, causing the top screen 3 to press down on screen 2; pressing in valve switch 10 retracts the working rod of cylinder 5, causing the top screen 3 to move upward and release screen 2. When the indicator arrow 11 is upward, it can pass through the through hole 1201 on the cover 12, allowing valve switch 10 to be pressed in. When the indicator arrow 11 is downward, it cannot pass through the through hole 1201 on the cover 12, preventing valve switch 10 from being pressed in. This prevents accidental activation of valve switch 10, which could cause the top screen 3 to move upward and release screen 2.

[0027] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A high square flat screen with a pneumatic regulating top deck device, characterized in that: The application relates to a screening box, which comprises a screening box (1), the inside of the screening box (1) is provided with a screening grid (2), the upper part of the screening grid (2) is provided with a screening top grid (3), the upper part of the screening top grid (3) is provided with a pneumatic adjusting top grid device, the pneumatic adjusting top grid device comprises two air cylinders (5), the two air cylinders (5) are arranged on the top surface of the screening box (1), the two ends of the screening top grid (3) are provided with adjusting grooves (4), and the working rods of the air cylinders (5) are arranged in the adjusting grooves (4).

2. High flat deck screen with pneumatic regulation of the top deck according to claim 1, characterized in that: The top surface of the screening box (1) is provided with a valve support (8), the top surface of the valve support (8) is provided with a two-position five-way valve (9), one side of the two-position five-way valve (9) is provided with a valve switch (10), the outer side of the two-position five-way valve (9) is provided with a protective cover (12), the valve switch (10) is arranged on the outer side of the protective cover (12), and an error-proof structure is further arranged on the protective cover (12).

3. High flat deck screen with pneumatic regulation of the top deck according to claim 2, characterized in that: The error-proof structure comprises an indicating arrow (11), the indicating arrow (11) is arranged on the valve switch (10), and the protective cover (12) is provided with a through hole (1201) matched with the cross-sectional shape of the indicating arrow (11).

4. The high frequency, fine deck screen with pneumatically adjusted top deck means of claim 2, wherein: The two air cylinders (5) are connected with the two-position five-way valve (9) through a branch air pipe (14), the two-position five-way valve (9) is provided with a speed regulating valve (7), the two-position five-way valve (9) is connected with a main air pipe (13), the main air pipe (13) is communicated with an air source, and the main air pipe (13) is provided with a one-way valve (6).

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