A screening device driven by a pneumatic motor

Abstract

The present invention discloses a screening device driven by a pneumatic motor, which relates to the technical field of screening devices and includes a screening mechanism. The screening mechanism includes a connected screening mechanism, a first screen unit, a second screen unit, a third screen unit, an upper cover, and a pneumatic motor. By setting the base in the present invention, the vibration force of the base of the screening mechanism decreases sequentially, enabling the base of the screening mechanism to be buffered and noise-reduced, avoiding noise generated by the collision of the screening mechanism with the ground during co-vibration, further avoiding the displacement of the screening mechanism, and further increasing the adhesion between the screening mechanism and the ground. At the same time, the pneumatic motor can be cooled. By setting the second shock-absorbing unit, the screening mechanism can be buffered and noise-reduced for the second time. By setting the sound-absorbing component, the pneumatic motor can be noise-reduced and at the same time, the pneumatic motor can be dissipated heat. By setting the uniform screening component, it is convenient for the materials to be evenly screened.

Description

Technical Field

[0001] The present invention relates to the technical field of screening equipment, and particularly relates to a screening equipment driven by a pneumatic motor. Background Art

[0002] The screening device driven by a pneumatic motor uses compressed air as a power source. The pneumatic motor converts pneumatic energy into mechanical vibration energy, thereby driving the vibration components of the screening device to perform screening operations. During operation, the pneumatic motor will generate relatively large noise and vibration, which will not only cause noise pollution to the surrounding environment, but may also cause noise due to the collision of the screening device with the ground. At the same time, it will also cause the screening device to move. At the same time, in the existing screening device, since the speed of the pneumatic motor will change with the change of the load, and the pneumatic motor is installed on the side wall of the vibrating screen grid, it is difficult to accurately control the speed, resulting in unstable vibration frequency of the screening equipment. Further, the force effect on the screening mesh during screening is uneven, resulting in poor screening effect. In addition, long-term operation of the pneumatic motor will cause its body to heat up, thereby affecting the progress of the work. Therefore, we propose a screening equipment driven by a pneumatic motor to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a screening equipment driven by a pneumatic motor, which solves the problems that during operation, the pneumatic motor will generate relatively large noise and vibration, which will not only cause noise pollution to the surrounding environment, but may also cause noise due to the collision of the screening device with the ground. At the same time, it will also cause the screening device to move. At the same time, in the existing screening device, since the speed of the pneumatic motor will change with the change of the load, and the pneumatic motor is installed on the side wall of the vibrating screen grid, it is difficult to accurately control the speed, resulting in unstable vibration frequency of the screening equipment. Further, the force effect on the screening mesh during screening is uneven, resulting in poor screening effect. In addition, long-term operation of the pneumatic motor will cause its body to heat up, thereby affecting the progress of the work.

[0004] The present invention solves the above technical problems through the following technical solutions. The present invention includes a screening mechanism, and the screening mechanism includes a connected screening mechanism, a first screen unit, a second screen unit, a third screen unit, an upper cover, and a pneumatic motor. The screening mechanism includes a shock absorption component for shock absorption, a plurality of sound absorption components for silencing and heat dissipation of the pneumatic motor, and a uniform screening component for uniform screening. The shock absorption component and the uniform screening component are connected to the pneumatic motor, and the sound absorption component is connected to the shock absorption component; the shock absorption component includes a connected first shock absorption part and a second shock absorption part, and the second shock absorption part is located above the first shock absorption part; the first shock absorption part includes a base and a pneumatic motor fixing frame, and a plurality of first shock absorption units are provided between the base and the pneumatic motor fixing frame, and the pneumatic motor fixing frame is connected to the pneumatic motor; the second shock absorption part includes a plurality of second shock absorption units provided on the pneumatic motor fixing frame, and a bottom support ring is provided above the plurality of second shock absorption units.

[0005] Preferably, the base includes a plurality of L-shaped plates in contact with the ground, and a first return-shaped plate is fixedly connected to the tops of the plurality of L-shaped plates; the pneumatic motor fixing frame includes a second return-shaped plate, a connecting frame is fixedly connected to the top of the second return-shaped plate, an air inlet pipe is fixedly connected to the center of the top of the connecting frame through a ventilation hole, and a pneumatic motor fixing plate fixedly connected to the pneumatic motor by bolts is fixedly connected to the top of the connecting frame; the first shock absorption unit includes a plurality of pressure air holes opened on the top of the first return-shaped plate, a first outer sheath fixedly connected to the top of the first return-shaped plate is provided above the pressure air holes, a first installation cavity is opened in the first outer sheath, and a first inner sheath is fixedly connected in the first installation cavity, and the shape of the first installation cavity is adapted to that of the first inner sheath.

[0006] Preferably, the first inner sheath includes a first fixing ring fixedly connected to the bottom of the first installation cavity, and a plurality of first elastic sheets fixedly connected to the top of the first fixing ring and distributed in a circumferential array.

[0007] Preferably, the first elastic sheet includes a first shock absorption section, a second shock absorption section, a third shock absorption section, a fourth shock absorption section, and a fifth shock absorption section fixedly connected in sequence. The first shock absorption section is fixedly connected to the first fixing ring. Both ends of the first shock absorption section, the second shock absorption section, the third shock absorption section, the fourth shock absorption section, and the fifth shock absorption section are arranged in a concave-outward and convex-inward shape, and the middle sections of the first shock absorption section, the second shock absorption section, the third shock absorption section, the fourth shock absorption section, and the fifth shock absorption section are arranged in a convex-outward and concave-inward shape. A plurality of first shock absorption sections form a first cavity, a plurality of second shock absorption sections form a second cavity, a plurality of third shock absorption sections form a third cavity, a plurality of fourth shock absorption sections form a fourth cavity, and a plurality of fifth shock absorption sections form a fifth cavity. The inner diameters of the first cavity, the second cavity, the third cavity, the fourth cavity, and the fifth cavity decrease in sequence.

[0008] Preferably, the second shock absorption unit includes communication holes opened at the top corners of the second square plate. Above the communication holes, there is a fixed cylinder fixedly connected to the top of the second square plate. A gas compression rod is inserted into the fixed cylinder. A second outer sheath fixedly connected between the bottom support ring and the second square plate is sleeved on the gas compression rod. A second installation cavity is opened in the second outer sheath. A second inner liner is fixedly connected in the second installation cavity. The second installation cavity is adapted to the shape of the gas compression rod. A limiting ring located above the fixed cylinder is fixedly sleeved on the gas compression rod.

[0009] Preferably, the second inner liner includes a second fixed ring fixedly connected to the bottom of the second installation cavity. At the top of the second fixed ring, a plurality of second elastic sheets distributed in a circumferential array are fixedly connected. The second elastic sheets are fixedly connected by a plurality of sixth shock absorption segments. The two ends of the sixth shock absorption segment are arranged in a concave-convex shape inward and outward, and the middle segment is arranged in a convex-concave shape outward and inward.

[0010] Preferably, the sound absorption component includes an air inlet hole opened on the outer side wall of the bottom support ring. A sound absorption pipe is fixedly connected in the air inlet hole. Sound absorption sponge is fixedly connected in the sound absorption pipe. The inner end of the sound absorption pipe is fixedly connected with a sound guiding plate, and the other end of the sound guiding plate is fixedly connected with the connecting frame.

[0011] Preferably, the sound absorption pipe includes a first noise reduction horn and a second noise reduction horn fixedly connected. The port diameter of the end of the second noise reduction horn close to the pneumatic motor is larger than that of the other end. The port diameter of the first noise reduction horn close to the second noise reduction horn is smaller than that of the other end. The sound guiding plate is arranged in a curved shape.

[0012] Preferably, the uniform screening component includes a fixed sleeve fixedly sleeved on the output shaft of the pneumatic motor. A plurality of corrugated plates distributed in a circumferential array are fixedly connected to the outer wall of the fixed sleeve. A ring plate is fixedly connected to the outer ends of the plurality of corrugated plates. The ring plate is fixedly connected to the inner wall of the first screening unit.

[0013] Preferably, an air hole communicating with the air compression hole is opened at the top of the L-shaped plate. The first outer sheath is made of rubber material. The connecting frame is arranged in a cross shape. A plurality of process holes are opened on the connecting frame. The air inlet pipe is arranged in a horn shape. The port diameter of the top of the air inlet pipe is smaller than that of the bottom.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting the base, the vibration force of the base of the screening mechanism decreases in turn, so that the base of the screening mechanism can be buffered and noise-reduced, avoiding the noise generated by the collision between the screening mechanism and the ground during co-vibration, further avoiding the displacement of the screening mechanism, and further increasing the adhesion between the screening mechanism and the ground, and at the same time, the pneumatic motor can be cooled.

[0015] By setting the second shock-absorbing unit, the screening mechanism can be buffered and noise-reduced for the second time.

[0016] By setting the sound-absorbing component, the pneumatic motor can be noise-reduced and at the same time, the pneumatic motor can be cooled.

[0017] By setting the equalizing and screening component, it is convenient for the materials to be evenly screened. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 is Figure 1 a three-dimensional structural schematic diagram of partial first partial cross-section;

[0020] Figure 3 is Figure 2 a three-dimensional structural schematic diagram of partial first cross-section;

[0021] Figure 4 is Figure 2 a three-dimensional structural schematic diagram of partial second cross-section;

[0022] Figure 5 is Figure 1 a three-dimensional structural schematic diagram of partial second partial cross-section;

[0023] Figure 6 is Figure 5 an enlarged structural schematic diagram at A in

[0024] Figure 7 is Figure 1 a partial three-dimensional structural schematic diagram;

[0025] Figure 8 is an enlarged three-dimensional structural schematic diagram of the second inner sleeve;

[0026] Figure 9 is an enlarged three-dimensional structural schematic diagram of the first inner sleeve.

[0027] The numbers in the figure indicate:

[0028] 1. Screening mechanism; 10. Base; 101. L-shaped plate; 102. First square plate; 12. Pneumatic motor fixing bracket; 120. Second square plate; 121. Connecting frame; 122. Pneumatic motor fixing plate; 123. Air inlet pipe; 13. First shock absorption unit; 130. Compressed air hole; 131. First outer sheath; 132. First inner sheath; 14. Bottom support ring; 15. Second shock absorption unit; 150. Communication hole; 151. Fixed cylinder; 152. Compressed air rod; 153. Second outer sheath; 154. Second inner sheath; 16. Sound absorption component; 162. Sound absorption pipe; 163. Sound guiding plate; 164. Sound absorption sponge; 17. Pneumatic motor; 18. Equalizing screening component; 181. Fixed sleeve; 182. Corrugated plate; 183. Ring plate; 2. First screen unit; 3. Second screen unit; 4. Third screen unit; 5. Upper cover. Detailed implementation mode

[0029] The following further elaborates on the above and other technical features and advantages of the present invention with reference to the accompanying drawings.

[0030] This embodiment provides a technical solution: a screening device driven by a pneumatic motor, as Figures 1-9 shown, comprising a screening mechanism 1, the screening mechanism 1 includes a connected screening mechanism 1, a first screen unit 2, a second screen unit 3, a third screen unit 4, an upper cover 5 and a pneumatic motor 17. The screening mechanism 1 includes a shock absorption component for shock absorption, a plurality of sound absorption components 16 for noise elimination and heat dissipation of the pneumatic motor 17, and an equalizing screening component 18 for uniform screening. The shock absorption component and the equalizing screening component 18 are connected to the pneumatic motor 17, and the sound absorption component 16 is connected to the shock absorption component; the shock absorption component includes a connected first shock absorption part and a second shock absorption part, and the second shock absorption part is located above the first shock absorption part; the first shock absorption part includes a base 10 and a pneumatic motor fixing bracket 12, and a plurality of first shock absorption units 13 are provided between the base 10 and the pneumatic motor fixing bracket 12, and the pneumatic motor fixing bracket 12 is connected to the pneumatic motor 17; the second shock absorption part includes a plurality of second shock absorption units 15 provided on the pneumatic motor fixing bracket 12, and a bottom support ring 14 is provided above the plurality of second shock absorption units 15.

[0031] As Figure 3 , Figure 4 and Figure 9As shown, the base 10 includes a plurality of L-shaped plates 101 in contact with the ground, and a first return-shaped plate 102 is fixedly connected to the tops of the plurality of L-shaped plates 101; the pneumatic motor fixing frame 12 includes a second return-shaped plate 120, a connecting frame 121 is fixedly connected to the top of the second return-shaped plate 120, an air inlet pipe 123 is fixedly connected to the center of the top of the connecting frame 121 through a ventilation hole, and a pneumatic motor fixing plate 122 fixedly connected to the pneumatic motor 17 by bolts is fixedly connected to the top of the connecting frame 121; the first shock absorption unit 13 includes a plurality of pressure holes 130 opened on the top of the first return-shaped plate 101, air holes communicating with the pressure holes 130 are opened on the top of the L-shaped plate 101, a first outer sheath 131 fixedly connected to the top of the first return-shaped plate 102 is arranged above the pressure holes 130, a first installation cavity is opened in the first outer sheath 131, a first inner liner 132 is fixedly connected in the first installation cavity, the shape of the first installation cavity is adapted to that of the first inner liner 132, the first outer sheath 131 is made of rubber material, the connecting frame 121 is arranged in a cross shape, a plurality of process holes are opened on the connecting frame 121, the air inlet pipe 123 is arranged in a horn shape, and the diameter of the top port of the air inlet pipe 123 is smaller than that of the bottom port.

[0032] The first inner liner 132 includes a first fixing ring fixedly connected to the bottom of the first installation cavity, a plurality of first elastic sheets fixedly connected to the top of the first fixing ring and distributed in a circumferential array. The first elastic sheet includes a first shock absorption section, a second shock absorption section, a third shock absorption section, a fourth shock absorption section and a fifth shock absorption section fixedly connected in sequence. The first shock absorption section is fixedly connected to the first fixing ring. Both ends of the first shock absorption section, the second shock absorption section, the third shock absorption section, the fourth shock absorption section and the fifth shock absorption section are arranged in a concave-outward and convex-inward shape, and the middle sections of the first shock absorption section, the second shock absorption section, the third shock absorption section, the fourth shock absorption section and the fifth shock absorption section are arranged in a convex-outward and concave-inward shape. A plurality of first shock absorption sections form a first cavity, a plurality of second shock absorption sections form a second cavity, a plurality of third shock absorption sections form a third cavity, a plurality of fourth shock absorption sections form a fourth cavity and a plurality of fifth shock absorption sections form a fifth cavity. The inner diameters of the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity decrease in sequence.

[0033] By setting the base 10, during use, when the second paperclip-shaped plate 120 vibrates, it will exert force on the first outer sheath 131 and also on the first inner liner 132. During this process, it will first exert force on the fifth cavity, causing the middle section of the fifth shock-absorbing section to deform. Further, it will cause the connection between the fifth shock-absorbing section and the fourth shock-absorbing section to deform. Even further, it will cause the middle section of the fourth shock-absorbing section to deform. Sequentially downward, it will cause the connections between the fourth shock-absorbing section and the third shock-absorbing section, the middle section of the third shock-absorbing section, the connection between the third shock-absorbing section and the second shock-absorbing section, the middle section of the second shock-absorbing section, the connection between the second shock-absorbing section and the first shock-absorbing section, and the middle section of the first shock-absorbing section to deform, thereby causing the vibration intensity to decrease sequentially, avoiding the noise generated by the collision of the first paperclip-shaped plate 102 with the ground during co-vibration, and further avoiding the displacement of the L-shaped plate 101. At the same time, when the first outer sheath 131 is squeezed, negative pressure will be generated, and the gas generated by the negative pressure will move downward through the pressure holes 130 and the air holes, further increasing the adhesion between the L-shaped plate 101 and the ground. At the same time, the gas will also buffer and reduce noise for the first outer sheath 131. When the pneumatic motor 17 is working, the air entering through the air inlet pipe 123 will cool the pneumatic motor 17.

[0034] As Figure 5 、 Figure 6 and Figure 8 shown, the second shock-absorbing unit 15 includes a communication hole 150 opened at the top corner of the second paperclip-shaped plate 120. Above the communication hole 150, there is a fixed cylinder 151 fixedly connected to the top of the second paperclip-shaped plate 120. A pressure gas rod 152 is inserted into the fixed cylinder 151. A second outer sheath 153 fixedly connected between the bottom support ring 14 and the second paperclip-shaped plate 120 is sleeved on the pressure gas rod 152. A second installation cavity is opened in the second outer sheath 153, and a second inner liner 154 is fixedly connected in the second installation cavity. The second installation cavity is adapted to the shape of the pressure gas rod 152. A limit ring is fixedly sleeved on the pressure gas rod 152 above the fixed cylinder 151. The second inner liner 154 includes a second fixed ring fixedly connected to the bottom of the second installation cavity. The top of the second fixed ring is fixedly connected with a plurality of second elastic pieces distributed in a circumferential array. The second elastic pieces are fixedly connected by a plurality of sixth shock-absorbing sections. The two ends of the sixth shock-absorbing section are set in a concave-convex shape inward and outward, and the middle section is set in a convex-concave shape outward and inward.

[0035] By setting the second shock-absorbing unit 15, during use, when the bottom support ring 14 vibrates, it will drive the pressure gas rod 152 to move downward, and at the same time, it will also cause the second outer sheath 153 to be stressed downward. Further, it will cause the second inner liner 154 to be stressed downward, and then cause the second elastic pieces to be stressed. Further, it will cause the vibration force to be unloaded sequentially through the sixth shock-absorbing section. When the pressure gas rod 152 and the second inner liner 154 move downward, negative pressure will be generated, further increasing the negative pressure of the first outer sheath 131, thereby reducing noise for the bottom support ring 14.

[0036] As Figure 4 shown, the sound insulation component 16 includes an air inlet hole opened on the outer side wall of the bottom support ring 14. A sound insulation pipe 162 is fixedly connected inside the air inlet hole. A sound insulation sponge 164 is fixedly connected inside the sound insulation pipe 162. The inner end of the sound insulation pipe 162 is fixedly connected with a sound guiding plate 163. The other end of the sound guiding plate 163 is fixedly connected with the connecting frame 121. The sound insulation pipe 162 includes a first noise reduction horn and a second noise reduction horn fixedly connected. The port diameter of the end of the second noise reduction horn close to the pneumatic motor 17 is larger than that of the other end. The port diameter of the first noise reduction horn close to the second noise reduction horn is smaller than that of the other end. The sound guiding plate 163 is arranged in a curved shape.

[0037] By providing the sound insulation component 16, during use, the sound and heat generated by the pneumatic motor 17 will be conducted to the second noise reduction horn through the sound guiding plate 163. The second noise reduction horn and the sound insulation sponge 164 will insulate the sound, and the heat will be discharged through the first noise reduction horn.

[0038] As Figure 4 and Figure 7 shown, the uniform screening component 18 includes a fixed sleeve 181 fixedly sleeved on the output shaft of the pneumatic motor 17. A plurality of corrugated plates 182 distributed in a circumferential array are fixedly connected to the outer wall of the fixed sleeve 181. The outer ends of the plurality of corrugated plates 182 are fixedly connected together with an annular plate 183. The annular plate 183 is fixedly connected to the inner wall of the first screen unit 2.

[0039] By providing the uniform screening component 18, during the use process, when the pneumatic motor 17 works, it will drive the rotating shaft to rotate. When the rotating shaft rotates, it will cause the annular plate 183 to vibrate. The vibration force conducted by the annular plate 183 will act on the first screen unit 2, further enabling the first screen unit 2 to vibrate evenly. Further, it will enable the second screen unit 3 and the third screen unit 4 to vibrate evenly, so as to facilitate the uniform screening of materials.

[0040] The above are only the preferred embodiments of the present invention, which are illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims

1. A screening device driven by a pneumatic motor, characterized in that: The invention comprises a screening mechanism, wherein the screening mechanism comprises a first screen unit, a second screen unit, a third screen unit, an upper cover and an air motor connected to each other, wherein the screening mechanism comprises a shock absorbing assembly for shock absorption, a plurality of silencer assemblies for silencer and heat dissipation of the air motor and an even screening assembly for even screening, wherein the shock absorbing assembly and the even screening assembly are connected to the air motor, and the silencer assembly is connected to the shock absorbing assembly; The shock absorbing assembly comprises a first shock absorbing component and a second shock absorbing component connected to each other, wherein the second shock absorbing component is located above the first shock absorbing component; The first shock absorbing component includes a base and a pneumatic motor fixing frame, a plurality of first shock absorbing units are arranged between the base and the pneumatic motor fixing frame, and the pneumatic motor fixing frame is connected to the pneumatic motor; The second shock absorbing component comprises a plurality of second shock absorbing units arranged on the pneumatic motor fixing frame, and a bottom supporting ring is arranged above the plurality of second shock absorbing units; The base comprises a plurality of L-shaped plates in contact with the ground, and a first circular plate is fixedly connected to the tops of the plurality of L-shaped plates; The pneumatic motor fixing frame includes a second circular plate, the top of the second circular plate is fixedly connected to a connecting frame, the top center of the connecting frame is fixedly connected to an air inlet pipe through a vent hole, and the top of the connecting frame is fixedly connected to a pneumatic motor fixing plate fixedly connected to the pneumatic motor through bolts; The first shock absorbing unit includes a plurality of air compression holes opened on the top of the first circular plate, a first outer sheath fixedly connected to the top of the first circular plate is provided above the air compression holes, a first installation cavity is opened in the first outer sheath, a first inner sleeve is fixedly connected in the first installation cavity, and the first installation cavity is adapted to the shape of the first inner sleeve; The second shock absorbing unit includes a connecting hole opened at the top corner of the second round-shaped plate, a fixing cylinder fixedly connected to the top of the second round-shaped plate is provided above the connecting hole, a compressor rod is inserted in the fixing cylinder, a second outer sheath fixedly connected between the bottom ring and the second round-shaped plate is sleeved on the compressor rod, a second installation cavity is opened in the second outer sheath, a second inner sleeve is fixedly connected in the second installation cavity, the second installation cavity is adapted to the shape of the compressor rod, and a limiting ring located above the fixing cylinder is fixedly sleeved on the compressor rod; The screening assembly includes a fixed sleeve fixedly sleeved on the output shaft of the pneumatic motor, a plurality of corrugated plates distributed in a circular array are fixedly connected to the outer wall of the fixed sleeve, a ring plate is fixedly connected to the outer ends of the plurality of corrugated plates, and the ring plate is fixedly connected to the inner wall of the first screen unit.

2. The screening device driven by the pneumatic motor as claimed in claim 1, characterized in that: The first inner sleeve comprises a first fixing ring fixedly connected to the bottom of the first installation cavity, and a plurality of first elastic sheets distributed in a circumferential array are fixedly connected to the top of the first fixing ring.

3. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: The first elastic sheet includes a first shock-absorbing section, a second shock-absorbing section, a third shock-absorbing section, a fourth shock-absorbing section and a fifth shock-absorbing section which are fixedly connected in sequence, the first shock-absorbing section is fixedly connected to the first fixing ring, both ends of the first shock-absorbing section, the second shock-absorbing section, the third shock-absorbing section, the fourth shock-absorbing section and the fifth shock-absorbing section are arranged in a concave outer shape and a convex inner shape, and the middle sections of the first shock-absorbing section, the second shock-absorbing section, the third shock-absorbing section, the fourth shock-absorbing section and the fifth shock-absorbing section are arranged in a convex outer shape and a concave inner shape, a plurality of first shock-absorbing sections form a first cavity, a plurality of second shock-absorbing sections form a second cavity, a plurality of third shock-absorbing sections form a third cavity, a plurality of fourth shock-absorbing sections form a fourth cavity and a plurality of fifth shock-absorbing sections form a fifth cavity, and the internal diameters of the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity decrease in sequence.

4. The screening device driven by the pneumatic motor as claimed in claim 3 is characterized in that: The second inner sleeve includes a second fixing ring fixedly connected to the bottom of the second mounting cavity, and the top of the second fixing ring is fixedly connected with a plurality of second elastic sheets distributed in a circular array, and the second elastic sheets are composed of a plurality of sixth shock-absorbing segments fixedly connected, and the two ends of the sixth shock-absorbing segment are arranged in a convex inner and concave outer shape, and the segment is arranged in a convex outer and concave inner shape.

5. The screening device driven by the pneumatic motor as claimed in claim 1, characterized in that: The silencer assembly includes an air inlet hole opened on the outer side wall of the bottom support ring, a silencer pipe is fixedly connected in the air inlet hole, a silencer sponge is fixedly connected in the silencer pipe, a sound guide plate is fixedly connected to the inner end of the silencer pipe, and the other end of the sound guide plate is fixedly connected to the connecting frame.

6. The screening device driven by the pneumatic motor as claimed in claim 5, characterized in that: The silencer tube includes a first noise reduction horn and a second noise reduction horn which are fixedly connected. The diameter of the port at one end of the second noise reduction horn close to the pneumatic motor is larger than the diameter of the port at the other end. The diameter of the port of the first noise reduction horn close to the second noise reduction horn is smaller than the diameter of the port at the other end. The sound guide plate is arranged in a curved shape.

7. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: An air hole connected to the air pressure hole is provided on the top of the L-shaped plate, the first outer sheath is made of rubber material, the connecting frame is arranged in a cross shape, a plurality of process holes are provided on the connecting frame, the air inlet pipe is arranged in a trumpet shape, and the top port diameter of the air inlet pipe is smaller than the bottom port diameter.

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