Screening equipment driven by pneumatic motor

Abstract

The invention discloses screening equipment driven by a pneumatic motor, and relates to the technical field of screening equipment, the screening equipment comprises a screening mechanism, and the screening mechanism comprises a screening mechanism body, a first screen unit, a second screen unit, a third screen unit, an upper cover and the pneumatic motor which are connected. Through the arrangement of the base, the vibration strength of the screening mechanism base is sequentially decreased, so that the screening mechanism base is buffered and subjected to noise reduction, noise generated by collision between the screening mechanism and the ground during co-vibration is avoided, then displacement of the screening mechanism is avoided, and the adhesive force between the screening mechanism and the ground can be further increased; and by arranging a first damping unit, the pneumatic motor can be cooled, by arranging a second damping unit, secondary buffering and noise reduction can be conducted on the screening mechanism, by arranging a noise reduction assembly, noise reduction can be conducted on the pneumatic motor, meanwhile, heat dissipation can be conducted on the pneumatic motor, and by arranging a uniform screening assembly, materials can be evenly screened conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, and in particular 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, and converts pneumatic energy into mechanical vibration energy through a pneumatic motor, thereby driving the vibrating components of the screening device to perform screening operations. The pneumatic motor will generate large noise and vibration during operation, which will not only cause noise pollution to the surrounding environment, but may also cause the screening device to collide with the ground and cause noise, and will also cause the screening device to move. At the same time, the speed of the pneumatic motor of the existing screening device will change with the load, and its pneumatic motor is installed on the side wall of the vibrating screen frame, so it is difficult to accurately control the speed, resulting in unstable vibration frequency of the screening equipment, and further uneven force effect on the screening net during screening, resulting in poor screening effect. In addition, long-term operation of the pneumatic motor will cause its body to heat up, which will affect the progress of the work. Therefore, we propose a screening device driven by a pneumatic motor to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a screening device driven by a pneumatic motor, which solves the problem that the pneumatic motor generates large noise and vibration during operation, which not only causes noise pollution to the surrounding environment, but also may cause the screening device to collide with the ground and cause noise, and also cause the screening device to move. At the same time, the speed of the pneumatic motor of the existing screening device changes with the load, and its pneumatic motor is installed on the side wall of the vibrating screen frame, so it is difficult to accurately control the speed, resulting in unstable vibration frequency of the screening equipment, and further uneven force effect when the screening net is screened, resulting in poor screening effect. In addition, the pneumatic motor will cause its body to heat up when working for a long time, 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, which includes a screening mechanism, a first screen unit, a second screen unit, a third screen unit, an upper cover and a pneumatic motor connected to each other. The screening mechanism includes a shock-absorbing assembly for shock absorption, a plurality of silencer assemblies for silencer and heat dissipation of the pneumatic motor and a screening assembly for uniform screening. The shock-absorbing assembly and the screening assembly are connected to the pneumatic motor, and the silencer assembly is connected to the shock-absorbing assembly; the shock-absorbing assembly includes a first shock-absorbing component and a second shock-absorbing component connected to each other, and the second shock-absorbing component is located above the first shock-absorbing component; the first shock-absorbing component includes a base and a motor fixing frame, a plurality of first shock-absorbing units are arranged between the base and the motor fixing frame, and the motor fixing frame is connected to the pneumatic motor; the second shock-absorbing component includes a plurality of second shock-absorbing units arranged on the motor fixing frame, and a bottom support ring is arranged above the plurality of second shock-absorbing units.

[0005] Preferably, the base includes a plurality of L-shaped plates in contact with the ground, and a first circular plate is fixedly connected to the top of the plurality of L-shaped plates; the motor fixing frame includes a second circular plate, and a connecting frame is fixedly connected to the top of the second circular plate, and an air inlet pipe is fixedly connected to the connecting frame through a vent hole at the top center of the connecting frame, and a motor fixing plate fixedly connected to the pneumatic motor through bolts is fixedly connected to the top of the connecting frame; the first shock absorbing unit includes a plurality of compressed air holes opened at the top of the L-shaped plate, and a first outer sheath fixedly connected to the top of the first circular plate is provided above the compressed air 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.

[0006] Preferably, 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 circular array are fixedly connected to the top of the first fixing ring.

[0007] Preferably, 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.

[0008] Preferably, the second shock absorbing unit includes a connecting hole opened at the top corner of the second circular plate, a fixing cylinder fixedly connected to the top of the second circular plate is provided above the connecting hole, a compressor rod is inserted in the fixing cylinder, a second outer sleeve fixedly connected between the bottom ring and the second circular plate is provided on the compressor rod, a second installation cavity is opened in the second outer sleeve, 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.

[0009] Preferably, 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 thereof is arranged in a convex outer and concave inner shape.

[0010] Preferably, the silencer assembly includes an air inlet hole opened on the outer wall of the base 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.

[0011] Preferably, the silencer tube includes a first noise reduction horn and a second noise reduction horn that 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, and the sound guide plate is arranged in a curved shape.

[0012] Preferably, 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.

[0013] Preferably, an air hole connected to the air pressure hole is opened 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 opened 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.

[0014] Compared with the prior art, the beneficial effect of the present invention is that: by setting a base, the vibration intensity of the base of the screening mechanism is gradually reduced, so that the base of the screening mechanism can be buffered and noise-reduced, avoiding the noise generated by the screening mechanism colliding with the ground during the same earthquake, thereby avoiding the displacement of the screening mechanism, and further increasing the adhesion between the screening mechanism and the ground, while cooling the pneumatic motor.

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

[0016] By arranging a silencer component, the noise of the pneumatic motor can be reduced and the heat of the pneumatic motor can be dissipated at the same time.

[0017] By setting up the screening component, the material can be screened evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 A schematic diagram of a first partial cutaway three-dimensional structure; Figure 3 for Figure 2 A schematic diagram of a partial first sectional three-dimensional structure; Figure 4 for Figure 2 A schematic diagram of a partial second cross-sectional three-dimensional structure; Figure 5 for Figure 1 A schematic diagram of a partial second partial cutaway three-dimensional structure; Figure 6 for Figure 5 The enlarged structural diagram at A in the middle; Figure 7 for Figure 1 Schematic diagram of some three-dimensional structures; Figure 8 It is an enlarged three-dimensional structural schematic diagram of the second inner sleeve; Fig. 9 This is an enlarged three-dimensional structural schematic diagram of the first inner sleeve.

[0019] The numbers in the figure represent: 1. Screening mechanism; 10. Base; 101. L-shaped plate; 102. First circular plate; 12. Motor fixing frame; 120. Second circular plate; 121. Connecting frame; 122. Motor fixing plate; 123. Air inlet pipe; 13. First damping unit; 130. Air pressure hole; 131. First outer sheath; 132. First inner liner; 14. Bottom ring; 15. Second damping unit; 150. Connecting hole; 1 51. Fixed cylinder; 152. Air pressure rod; 153. Second outer sleeve; 154. Second inner sleeve; 16. Silencer assembly; 162. Silencer pipe; 163. Sound guide plate; 164. Silencer sponge; 17. Pneumatic motor; 18. Screening assembly; 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 DESCRIPTION

[0020] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0021] This embodiment provides a technical solution: a screening device driven by a pneumatic motor, such as Figure 1-9 As shown, the screening mechanism 1 includes a screening mechanism 1, which 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 an air motor 17. The screening mechanism 1 includes a shock-absorbing assembly for shock absorption, a plurality of silencer assemblies 16 for silencing and heat dissipation of the air motor 17, and a uniform screening assembly 18 for uniform screening. The shock-absorbing assembly and the uniform screening assembly 18 are connected to the air motor 17, and the silencer assembly 16 is connected to the shock-absorbing assembly; the shock-absorbing assembly includes a first shock-absorbing component and a second shock-absorbing component connected to each other, and the second shock-absorbing component is located above the first shock-absorbing component; the first shock-absorbing component includes a base 10 and a motor fixing frame 12, a plurality of first shock-absorbing units 13 are arranged between the base 10 and the motor fixing frame 12, and the motor fixing frame 12 is connected to the air motor 17; the second shock-absorbing component includes a plurality of second shock-absorbing units 15 arranged on the motor fixing frame 12, and a bottom supporting ring 14 is arranged above the plurality of second shock-absorbing units 15.

[0022] like Figure 3 , Figure 4 and Fig. 9 As shown, the base 10 includes a plurality of L-shaped plates 101 in contact with the ground, and a first circular plate 102 is fixedly connected to the top of the plurality of L-shaped plates 101; the motor fixing frame 12 includes a second circular plate 120, and a connecting frame 121 is fixedly connected to the top of the second circular plate 120, and an air inlet pipe 123 is fixedly connected to the top center of the connecting frame 121 through a vent hole, and a motor fixing plate 122 fixedly connected to the pneumatic motor 17 through bolts is fixedly connected to the top of the connecting frame 121; the first shock absorbing unit 13 includes a plurality of compressed air holes 130 opened at the top of the L-shaped plate 101, and the L-shaped plate 10 1 is provided with an air hole connected with the air pressure hole 130 at the top, and a first outer sheath 131 fixedly connected to the top of the first round-shaped plate 102 is provided above the air pressure hole 130, a first installation cavity is provided in the first outer sheath 131, a first inner sleeve 132 is fixedly connected in the first installation cavity, and the first installation cavity is adapted to the shape of the first inner sleeve 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 arranged on the connecting frame 121, the air inlet pipe 123 is arranged in a trumpet shape, and the top port diameter of the air inlet pipe 123 is smaller than the bottom port diameter.

[0023] The first inner sleeve 132 includes a first fixed ring fixedly connected to the bottom of the first installation cavity, and a plurality of first elastic sheets distributed in a circular array are fixedly connected to the top of the first fixed ring, and 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, and the first shock-absorbing section is fixedly connected to the first fixed ring, and 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 all arranged in a concave outer and 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 all arranged in a convex outer and concave inner shape, and 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.

[0024] By setting the base 10, during use, when the second circular plate 120 vibrates, force will be applied to the first outer sheath 131, and force will also be applied to the first inner liner 132. During the process, force will be applied to the fifth cavity first, which will cause the middle section of the fifth shock-absorbing section to deform, and further cause the connection between the fifth shock-absorbing section and the fourth shock-absorbing section to deform, and further cause the middle section of the fourth shock-absorbing section to deform, and then the connection 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, and the connection between the second shock-absorbing section and the first shock-absorbing section will deform downward in sequence. The connection between the seismic sections and the middle section of the first shock-absorbing section are deformed, which will cause the vibration intensity to decrease successively, avoiding the first circular plate 102 from colliding with the ground and generating noise during the same seismic movement, thereby avoiding the displacement of the L-shaped plate 101. At the same time, the first outer sheath 131 will generate negative pressure when squeezed, 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 the noise of the first outer sheath 131. When the pneumatic motor 17 is working, the air entering the air inlet pipe 123 will cool down the pneumatic motor 17.

[0025] like Figure 5 , Figure 6 and Figure 8As shown, the second shock absorbing unit 15 includes a connecting hole 150 opened at the top corner of the second circular plate 120, and a fixing cylinder 151 fixedly connected to the top of the second circular plate 120 is provided above the connecting hole 150, and a compression rod 152 is inserted into the fixing cylinder 151, and a second outer sheath 153 fixedly connected between the bottom ring 14 and the second circular plate 120 is sleeved on the compression rod 152, and a second installation cavity is opened in the second outer sheath 153, and a second inner sheath 153 is fixedly connected in the second installation cavity. The bushing 154 and the second mounting cavity are adapted to the shape of the air compressor rod 152. The air compressor rod 152 is fixedly sleeved with a limiting ring located above the fixed tube 151. The second inner bushing 154 includes a second fixing ring fixedly connected to the bottom of the second mounting cavity. The top of the second fixing ring is fixedly connected with a plurality of second elastic sheets distributed in a circular array. The second elastic sheets are composed of a plurality of sixth shock-absorbing segments fixedly connected. The two ends of the sixth shock-absorbing segment are arranged in an inner convex and outer concave shape, and the segments are arranged in an outer convex and inner concave shape.

[0026] By setting the second shock absorbing unit 15, during use, when the bottom ring 14 vibrates, it will drive the compressor rod 152 to move downward, and at the same time, the second outer sleeve 153 will be forced downward, further the second inner sleeve 154 will be forced downward, and then the second elastic sheet will be forced, further the vibration force will be unloaded in sequence through the sixth shock absorbing section, the compressor rod 152 and the second inner sleeve 154 will generate negative pressure when moving downward, further the negative pressure of the first outer sleeve 131 will be enhanced, so that the noise of the bottom ring 14 can be reduced.

[0027] like Figure 4 As shown, the silencer assembly 16 includes an air inlet hole opened on the outer wall of the supporting ring 14, a silencer pipe 162 is fixedly connected in the air inlet hole, a silencer sponge 164 is fixedly connected in the silencer pipe 162, a sound guide plate 163 is fixedly connected to the inner end of the silencer pipe 162, the other end of the sound guide plate 163 is fixedly connected to the connecting frame 121, the silencer pipe 162 includes a first noise reduction horn and a second noise reduction horn that are fixedly connected, the port diameter of the second noise reduction horn close to the pneumatic motor 17 is larger than the port diameter of the other end, the port diameter of the first noise reduction horn close to the second noise reduction horn is smaller than the port diameter of the other end, and the sound guide plate 163 is arranged in a curved shape.

[0028] By providing the silencer assembly 16, when in use, the sound and heat generated by the pneumatic motor 17 will be conducted to the second noise reduction speaker through the sound guide plate 163, the second noise reduction speaker and the silencer sponge 164 will soundproof the sound, and the heat will be discharged through the first noise reduction speaker.

[0029] like Figure 4 and Figure 7The screening assembly 18 includes a fixed sleeve 181 fixedly sleeved on the output shaft of the pneumatic motor 17, and a plurality of corrugated plates 182 distributed in a circular array are fixedly connected to the outer wall of the fixed sleeve 181. The outer ends of the plurality of corrugated plates 182 are commonly fixedly connected to a ring plate 183, and the ring plate 183 is fixedly connected to the inner wall of the first screen unit 2.

[0030] By setting up the screening assembly 18, during use, the pneumatic motor 17 will drive the rotating shaft to rotate when working, and the rotation of the rotating shaft will cause the ring plate 183 to vibrate. The vibration force transmitted by the ring plate 183 will act on the first screen unit 2, further causing the first screen unit 2 to vibrate evenly, and further causing the second screen unit 3 and the third screen unit 4 to vibrate evenly, thereby facilitating even screening of the material.

[0031] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A screening device driven by a pneumatic motor, characterized in that: The invention comprises a screening mechanism (1), wherein the screening mechanism (1) comprises a screening mechanism (1), a first screen unit (2), a second screen unit (3), a third screen unit (4), an upper cover (5) and an air motor (17) which are connected to each other; the screening mechanism (1) comprises a shock absorbing component for shock absorption, a plurality of silencer components (16) for silencer and heat dissipation of the air motor (17), and a screening component (18) for uniform screening; the shock absorbing component and the screening component (18) are connected to the air motor (17), and the silencer component (16) is connected to the shock absorbing component; 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 comprises a base (10) and a motor fixing frame (12), a plurality of first shock absorbing units (13) are arranged between the base (10) and the motor fixing frame (12), and the motor fixing frame (12) is connected to the pneumatic motor (17); The second shock absorbing component comprises a plurality of second shock absorbing units (15) arranged on the motor fixing frame (12), and a bottom supporting ring (14) is arranged above the plurality of second shock absorbing units (15).

2. The screening device driven by the pneumatic motor as claimed in claim 1, characterized in that: The base (10) comprises a plurality of L-shaped plates (101) in contact with the ground, and a first circular plate (102) is fixedly connected to the tops of the plurality of L-shaped plates (101); The motor fixing frame (12) comprises a second circular plate (120), the top of the second circular plate (120) is fixedly connected to a connecting frame (121), a ventilation hole is opened at the center of the top of the connecting frame (121) and is fixedly connected to an air inlet pipe (123), and the top of the connecting frame (121) is fixedly connected to a motor fixing plate (122) fixedly connected to the pneumatic motor (17) via bolts; The first shock absorbing unit (13) comprises a plurality of compressed air holes (130) formed at the top of the L-shaped plate (101); a first outer sleeve (131) fixedly connected to the top of the first circular plate (102) is provided above the compressed air holes (130); a first installation cavity is provided in the first outer sleeve (131); a first inner sleeve (132) is fixedly connected in the first installation cavity; the first installation cavity is adapted to the shape of the first inner sleeve (132).

3. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: The first inner sleeve (132) 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.

4. The screening device driven by the pneumatic motor as claimed in claim 3 is 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.

5. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: The second shock absorbing unit (15) comprises a connecting hole (150) provided at a top corner of the second circular plate (120); a fixing tube (151) fixedly connected to the top of the second circular plate (120) is provided above the connecting hole (150); a compressor rod (152) is inserted into the fixing tube (151); a second outer sleeve (153) fixedly connected between the bottom ring (14) and the second circular plate (120) is sleeved on the compressor rod (152); a second installation cavity is provided in the second outer sleeve (153); a second inner sleeve (154) is fixedly connected in the second installation cavity; the second installation cavity is adapted to the shape of the compressor rod (152); a limiting ring located above the fixing tube (151) is fixedly sleeved on the compressor rod (152).

6. The screening device driven by the pneumatic motor as claimed in claim 5, characterized in that: The second inner sleeve (154) comprises a second fixing ring fixedly connected to the bottom of the second installation cavity, a plurality of second elastic sheets distributed in a circumferential array are fixedly connected to the top of the second fixing ring, the second elastic sheets are composed of a plurality of sixth shock absorbing segments fixedly connected, the two ends of the sixth shock absorbing segment are arranged in a convex inner and concave outer shape, and the segment thereof is arranged in a convex outer and concave inner shape.

7. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: The silencer assembly (16) comprises an air inlet hole formed on the outer wall of the supporting ring (14), a silencer pipe (162) being fixedly connected in the air inlet hole, a silencer sponge (164) being fixedly connected in the silencer pipe (162), a sound guide plate (163) being fixedly connected at the inner end of the silencer pipe (162), and the other end of the sound guide plate (163) being fixedly connected to the connecting frame (121).

8. The screening device driven by the pneumatic motor as claimed in claim 7, characterized in that: The silencer pipe (162) comprises a first noise reduction horn and a second noise reduction horn which are fixedly connected, the diameter of a port at one end of the second noise reduction horn close to the pneumatic motor (17) is larger than the diameter of a port at the other end, the diameter of a port at the first noise reduction horn close to the second noise reduction horn is smaller than the diameter of the port at the other end, and the sound guide plate (163) is arranged in a curved shape.

9. The screening device driven by the pneumatic motor as claimed in claim 1, characterized in that: The sieve balancing assembly (18) comprises a fixed sleeve (181) fixedly sleeved on an output shaft of the pneumatic motor (17); a plurality of wave plates (182) distributed in a circular array are fixedly connected to the outer wall of the fixed sleeve (181); a ring plate (183) is fixedly connected to the outer ends of the plurality of wave plates (182); and the ring plate (183) is fixedly connected to the inner wall of the first sieve unit (2).

10. The screening device driven by the pneumatic motor as claimed in claim 2, characterized in that: The top of the L-shaped plate (101) is provided with an air hole connected to the air pressure hole (130); 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 arranged on the connecting frame (121); the air inlet pipe (123) is arranged in a trumpet shape; and the diameter of the top port of the air inlet pipe (123) is smaller than the diameter of the bottom port.

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