A grizzly chain apron primary screen

Abstract

The present application relates to a kind of grate chain plate primary cleaning screen, including shell, conveying assembly, drive assembly, screen tooth component and excitation component, the conveying assembly is installed in the shell interior, including two rows of front and rear interval and synchronous operation conveying chain, respectively set in the drive sprocket and return sprocket with the conveying chain meshing with each other;The drive assembly is connected with the drive sprocket, for driving the drive sprocket rotation, to drive the conveying chain and return sprocket rotation;The screen tooth component includes shaft tube and grate, the both ends of the shaft tube are fixedly connected with the link of conveying chain by pin shaft, the number of the grate is multiple and is evenly spaced and inserted on the shaft tube, the shaft tube can rotate relative to the pin shaft;The excitation component is set below the upper section of the screen tooth component, for making the screen surface produced vibration in the upper section lap joint of the screen tooth component.The present application has the beneficial effects of better screening effect and longer service life.

Description

Technical Field

[0001] This invention relates to the field of grain sorting equipment technology, specifically to a grate-type chain plate primary cleaning screen. Background Technology

[0002] Cleaning screens are among the most commonly used equipment for material screening, especially in the grain industry. Their basic function is to separate impurities from materials to obtain purer materials, or to sort materials by particle size.

[0003] Existing cleaning screens on the market come in various structural forms, but they all basically use perforated screen plates or woven mesh to form the screen surface to achieve the cleaning function. Material flows through the upper part of the screen or screen plate under different excitation forces or gravity. Larger particles cannot pass through the screen holes and are isolated at the upper part of the screen or screen plate, while the remaining material passes through the screen surface, thus achieving material screening. For example, Chinese patent CN107597588A discloses a multi-layer vibrating screen for grain sorting, including a support frame, a hopper at the top of the support frame, wheels installed at the bottom of the support frame, a base plate installed from bottom to top on the inner side of the support frame, an inclined first sorting hopper, a second sorting hopper with the same inclination as the first sorting hopper, and a receiving hopper installed on the base plate; the first sorting hopper includes a first vibrating screen bucket, a first vibrating box installed at the top of the first vibrating screen bucket, and a first output funnel at the bottom of the first vibrating screen bucket; the second sorting hopper includes a second vibrating screen bucket, a second vibrating box installed at the top of the second vibrating screen bucket, and a second output funnel at the bottom of the second vibrating screen bucket. The aforementioned vibrating screens in the prior art, through their double-layered sorting hoppers, can perform secondary sorting of grain crops, that is, simultaneously screening two types of crops with different particle sizes, thus improving the sorting efficiency of grain crops. However, the mesh structure of the screen hoppers is prone to clogging after prolonged use, requiring manual cleaning or the addition of additional cleaning devices.

[0004] To address this issue, the applicant applied for a grate-type primary cleaning screen on March 31, 2010 (application number 2010201457435). This screen, formed by overlapping screen plates, automatically flips outwards when it reaches the front, impacting a buffer pad to dislodge large and flexible impurities. This prevents mesh clogging and eliminates the need for manual screen cleaning or cleaning brushes. The automatically flipping screen plate vibrates upon impact with the buffer pad, enhancing the screen's vibration effect, accelerating material passage, and improving production efficiency. However, the aforementioned primary cleaning screen still has the following problems in actual use:

[0005] 1) The screen plate and the sleeve are fixed by welding. Welding can easily cause deformation of the long strip screen plate, affecting the screening effect;

[0006] 2) The excitation section consists of a vibrating motor. The vibration generated by the vibrating motor is a relatively concentrated and rigid vibration. This results in better screening of grain only on the screen surface near the excitation section, while other parts have poor screening effect due to less vibration. In addition, the rigid vibration will cause some impurities with similar particle size to the grain to fall to the collection port, affecting the screening effect. Furthermore, the rigid vibration will accelerate the wear of the screen plates and cause fatigue cracking at the welded parts.

[0007] 3) When the automatically flipping screen plate is flipped, it hits the buffer pad. During the subsequent movement, the drooping screen plate will continue to swing irregularly due to the impact force with the buffer pad, which can easily cause cross-blocking between two adjacent vertical screen plates.

[0008] 4) Grain falls onto the screen surface through the inlet. Large particles and flexible impurities flow out through the outlet when the screen surface moves forward to the front end. Under the automatic rotation of the screen plate and the impact of the buffer pad, the grain falls into the outlet through the screen surface, thus separating the large particles and flexible impurities mixed in the grain. However, in actual use, light impurities and small flexible particles mixed in the grain will fall into the outlet along with the grain from the screen surface, resulting in a lot of light impurities and small flexible particles mixed in the screened grain, which affects the screening effect.

[0009] 5) The screen plate is fixedly connected to the sleeve and supported by the pins inside the sleeve under the conveyor chains on both sides. The rotation between the sleeve and the pins will be stuck, which will cause the screen plate to be unable to restore its overlapping state by its own gravity when it returns to the top. Summary of the Invention

[0010] The present invention aims to provide a grate-type chain plate primary cleaning screen to overcome the shortcomings of the prior art. The technical problem to be solved by the present invention is achieved through the following technical solution.

[0011] A grate-type chain plate primary cleaning screen includes a housing, a conveying assembly, a driving assembly, a screen tooth assembly, and a vibration assembly. The conveying assembly is installed inside the housing and includes two rows of conveyor chains that are spaced apart and run synchronously, a drive sprocket and a return sprocket respectively disposed at the left and right ends of the housing and meshing with the conveyor chains. The driving assembly is connected to the drive sprockets and is used to drive the drive sprockets to rotate, thereby driving the conveyor chains and the return sprockets to rotate. The screen tooth assembly includes a shaft tube and grate teeth, and the two ends of the shaft tube are connected to the conveyor chains spaced apart by pins. The chain links are fixedly connected, and the number of grating teeth is multiple and evenly spaced before and after being inserted into the shaft tube. The shaft tube can rotate relative to the pin. Limit bolts are provided at both ends of the shaft tube, and limit grooves are provided on the pin. The limit bolts are installed on the shaft tube radially and their ends are placed in the limit grooves. The excitation assembly is located below the upper section of the screen tooth assembly and is used to make the screen surface formed by the overlapping of the screen tooth assembly in the upper section vibrate. A guide baffle is provided inside the housing on the right side of the return sprocket.

[0012] Preferably, the comb teeth include an open end and a closed end. The open end includes fork-shaped double-toothed inserts. The closed end is provided with a curved portion. The tail end of the curved portion is provided with a limiting portion. The vertical distance between the tail end of the limiting portion and the insert is less than the radius of the shaft tube. The horizontal distance between the tail end of the limiting portion and the starting end of the curved portion is not greater than the outer diameter of the shaft tube. The shaft tube is provided with holes that match the inserts.

[0013] Preferably, the excitation assembly includes several rockers and rollers. The rollers are mounted on the spindle and are evenly spaced back and forth on the spindle. There are multiple spindles, which are evenly spaced left and right on the housing and located below the upper section of the conveyor chain. The rockers are fixedly mounted on the shaft tube at intervals back and forth. When the screen tooth assembly runs to the upper section, the height of the end of the rocker is lower than the height of the upper end of the roller.

[0014] Preferably, the height of the rocker arm end is higher than the height of the roller axis.

[0015] Preferably, a support plate is provided below at least the upper section of the conveyor chain.

[0016] Preferably, the inner surface of the guide baffle is provided with a toothed facing layer made of flexible material.

[0017] Preferably, a feed hopper is provided at the upper right end of the shell, a collection hopper is provided at the lower middle part of the shell, and a debris collection hopper is provided at the lower left part.

[0018] Preferably, a feeding roller is provided inside the feeding hopper, and a gravity gate that cooperates with the feeding roller is provided on the left side of the feeding roller. An air duct that tilts to the upper right is provided below the feeding roller in the feeding hopper. The left end of the air duct matches the material drop point below the feeding roller, and the right end is connected to a negative pressure suction device.

[0019] Preferably, a guide plate is provided inside the housing between the feeding roller and the return sprocket. The guide plate is used to guide the material falling from the feed hopper to the screen surface formed by the overlapping of the screen tooth assembly in the upper section.

[0020] Preferably, a buffer pad is provided inside the housing at a position slightly above and to the right of the collection hopper, and the height of the buffer pad is such that when the grating teeth move from the drive sprocket to the downward section, they collide with the buffer pad.

[0021] The grate-type chain plate primary cleaning screen provided by this invention has the following beneficial effects:

[0022] 1) The mesh teeth and shaft tube are fixed by insertion, which avoids welding deformation compared with the welding method in the existing technology, extends the service life of the primary cleaning screen, and is easy to disassemble and assemble, saving assembly time;

[0023] 2) The setting of limit bolts and limit slide grooves restricts the swing angle of the sieve teeth and increases the resistance of swing, so that the sieve teeth can return to the natural drooping state as soon as possible, thereby avoiding cross jamming between adjacent two longitudinal rows of sieve teeth.

[0024] 3) The vibration component is designed to simulate the manual action of picking up wheat straw with a fork, resulting in a gentler vibration. This prevents impurities of similar particle size to grains from falling into the hopper due to excessive vibration intensity, leading to better screening. The flexible vibration also prevents the teeth from loosening from the shaft tube, enhancing reliability. The vibration generated by the vibration component covers the entire screen surface and is evenly distributed, resulting in better screening.

[0025] 4) The veneer layer ensures that the grates return to their overlapping state promptly when they reach the upper section;

[0026] 5) The gravity gate and feeding rollers make the grain and impurities evenly dispersed, making it easier to separate the grain and impurities and improve the screening effect; the exhaust pipe can suck out the lighter and smaller impurities in the falling grain material from the feed hopper to achieve a better screening effect.

[0027] 6) The support plate can support the conveyor chain in the upper section and prevent the conveyor chain from sagging, so that the screen tooth assembly can maintain a good overlap state, thereby keeping the screen surface relatively flat and making the screening effect better. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the feed hopper in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the excitation component in this invention;

[0031] Figure 4 This is a schematic diagram of the structure of the comb teeth in this invention;

[0032] Figure 5 This is a schematic diagram of the structure of the comb teeth in this invention from another angle;

[0033] Figure 6 This is a structural schematic diagram of the fang teeth in this invention from another angle;

[0034] The reference numerals in the attached drawings are as follows: 1. Shell, 11. Lower shell, 12. Upper shell, 13. Mixture hopper, 14. Material hopper, 2. Feed hopper, 21. Feed roller, 22. Gravity gate, 23. Air duct, 3. Screen tooth assembly, 31. Pin, 311. Limiting groove, 32. Shaft tube, 33. Grate teeth, 331. Bending part, 332. Limiting part, 34. Limiting bolt, 41. Drive sprocket, 42. Return sprocket, 43. Conveyor chain, 44. Support chain plate, 5. Drive assembly, 6. Vibration assembly, 61. Rocker arm, 62. Roller, 63. Mandrel, 7. Buffer pad, 8. Guide baffle, 9. Frame. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Example 1:

[0037] Reference Figure 1As shown, an improved grate-type chain plate primary cleaning screen includes a housing 1, a conveying assembly, a driving assembly 5, a screen tooth assembly 3, and a vibration assembly 6. The conveying assembly is installed inside the housing 1 and includes two rows of synchronously running conveyor chains 43 spaced apart, a drive sprocket 41 and a return sprocket 42 respectively disposed at the left and right ends of the housing 1 and meshing with the conveyor chains 43. The driving assembly 5 is connected to the drive sprocket 41 and is used to drive the drive sprocket 41 to rotate, thereby driving the screen... The conveyor chain 43 and return sprocket 42 rotate; the screen tooth assembly 3 includes a shaft tube 32 and grate teeth 33. The two ends of the shaft tube 32 are fixedly connected to the links of the conveyor chain 43, which are arranged at intervals in front and behind, through pins 31. There are multiple grate teeth 33, which are evenly spaced in front and behind and inserted into the shaft tube 32. The shaft tube 32 can rotate relative to the pins 31; the vibration assembly 6 is arranged below the upper section of the screen tooth assembly 3 and is used to make the screen surface formed by the overlapping of the screen tooth assembly 3 in the upper section vibrate.

[0038] Furthermore, a feed hopper 2 is provided at the upper right end of the shell 1, a collection hopper 14 is provided at the lower middle part of the shell 1, and a debris collection hopper 13 is provided at the lower left.

[0039] In this embodiment, the feed hopper 2 is welded from steel plates and profiles. A monitoring window and inspection port are provided on the side of the feed hopper 2. The housing 1 adopts a split upper and lower structure. The upper housing 12 can be composed of multiple sections. Inspection windows are provided on the upper part and sides of the housing 1. The collecting hopper 14 and the waste collecting hopper 13 are integrally formed with the housing 1 or welded to it as a whole. A frame 9 is provided on the outside of the housing 1. The frame 9 is fixed by bending and welding profiles or steel plates or by bolt connection. The frame 9 is used to support the housing 1.

[0040] During operation, grain material falls from the feed hopper 2 onto the screen surface formed by the overlapping screen tooth assembly 3. The grain can pass through the screen surface and fall into the collection hopper 14 below. Large particles and flexible impurities rotate to the left on the screen surface to the front end, where the screen tooth assembly 3 automatically flips to throw the impurities out and they flow out into the collection hopper 13. In the downward section, under the action of gravity, the grates 33 of the screen tooth assembly 3 naturally droop, leaving a larger gap for the grain to fall into the collection hopper 14. When the screen tooth assembly 3 runs to the return sprocket 42 and continues to run upward, it naturally forms a screen surface with the next screen tooth assembly.

[0041] In this embodiment, the grating teeth 33 and the shaft tube 32 are fixed by insertion. Compared with the welding method in the prior art, this avoids welding deformation, extends the service life of the primary cleaning screen, and is easy to disassemble and assemble, saving assembly time.

[0042] Furthermore, a buffer pad 7 is provided inside the housing 1 at a position slightly above and to the right of the collection hopper 13. The height of the buffer pad 7 is such that when the grating teeth 33 rotate from the drive sprocket 41 to the downward section, they collide with the buffer pad 7.

[0043] In this embodiment, the buffer pad 7 serves two purposes. First, when the screen tooth assembly 3 automatically flips to the downward section, it throws out large particles and flexible impurities. Then, under the impact of the buffer pad 7, the impurities remaining on the screen tooth assembly are further bounced into the collection hopper 13. Second, the buffer pad 7 has a certain tilt angle, which can guide and block the falling impurities, directing them towards the collection hopper 13 and preventing them from falling into the right-side collection hopper 1, thereby improving the screening effect.

[0044] Example 2:

[0045] Based on Example 1, referring to Figures 3 to 6 As shown, the comb teeth 33 include an open end and a closed end. The open end includes a fork-shaped double-tooth structure insert tooth. The closed end is provided with a curved portion 331. The tail end of the curved portion 331 is provided with a limiting portion 332. The vertical distance between the tail end of the limiting portion 332 and the insert tooth is less than the radius of the shaft tube 32. The horizontal distance between the tail end of the limiting portion 332 and the starting end of the curved portion 331 is not greater than the outer diameter of the shaft tube 32. The shaft tube 32 is provided with holes that match the insert teeth.

[0046] In this embodiment, refer to Figures 4 to 6 As shown, when installing the comb teeth 33, the elongated teeth are inserted into the holes of the shaft tube 32, and then pushed forward so that the curved portion 331 of the comb teeth 33 wraps around the lower half of the shaft tube 32, and the limiting portion 332 engages with the outer wall of the shaft tube 32. The vertical distance between the end of the limiting portion 332 and the teeth is less than the radius of the shaft tube 32, and the horizontal distance between the tail end of the limiting portion 332 and the starting end of the curved portion 331 is not greater than the outer diameter of the shaft tube 32, thus restricting the movement of the comb teeth 33 and the shaft tube 32 along the direction of the teeth, thereby ensuring a firm connection between the comb teeth 33 and the shaft tube 32. During disassembly, since the elongated teeth 33 allow for a certain degree of elastic deformation, they can be pulled out of the holes of the shaft tube 32 with a certain force, making disassembly and assembly convenient and secure.

[0047] Example 3:

[0048] Based on Example 2, referring to Figure 4 As shown, the two ends of the shaft tube 32 are provided with limit bolts 34, and the pin 31 is provided with a limit groove 311. The limit bolts 34 are installed on the shaft tube 32 radially and the ends are placed in the limit groove 311.

[0049] In this embodiment, when the screen tooth assembly 3 continues to run downhill via the left side of the drive sprocket 41, the grate teeth 33 collide with the buffer pad 7. Although this facilitates the screening of large and flexible impurities into the collection hopper 13, the grate teeth 33 continue to swing irregularly in the downhill section due to the impact of the buffer pad 7. This can easily lead to cross-blocking between adjacent rows of grate teeth, affecting subsequent screening operations. The setting of the limiting bolt 34 and the limiting slide groove 311 restricts the swing angle of the grate teeth 33 and increases the resistance to swing, thereby allowing the grate teeth 33 to quickly return to their natural drooping state, thus avoiding cross-blocking between adjacent rows of screen teeth.

[0050] Example 4:

[0051] Based on Example 2 or 3, refer to Figure 1 and Figure 3 As shown, the excitation assembly 6 includes several rocker arms 61 and rollers 62. The rollers 62 are mounted on the spindle 63 and are evenly spaced back and forth on the spindle 63. There are multiple spindles 63, which are evenly spaced left and right on the housing 1 and located below the upper section of the conveyor chain 43. The rocker arms 61 are fixedly mounted on the shaft tube 32 at intervals back and forth. When the screen tooth assembly 3 runs to the upper section, the height of the end of the rocker arm 61 is lower than the height of the upper end of the roller 62.

[0052] Furthermore, the height of the end of the rocker arm 61 is lower than the height of the upper end of the roller 62 but higher than the axial height of the roller 62.

[0053] In this embodiment, when the sieve tooth assembly 3 is in the upward section, the end of the rocker arm 61 collides with the roller 62 with a small impact amplitude, simulating the manual action of picking wheat straw with a fork. This makes the vibration of the sieve surface formed by the overlapping of the sieve tooth assembly 3 in the upward section of the conveyor chain 43 more gentle, avoiding the fall of impurities with similar particle size to grains into the collection hopper due to excessive vibration intensity, resulting in better screening effect. Soft vibration can prevent the sieve teeth 33 from loosening from the shaft tube 32, making it more reliable. The number of mandrels 63 is multiple and they are installed at intervals on the left and right sides below the upward section of the conveyor chain 43, so that the vibration generated by the vibration assembly 6 on the sieve surface basically covers the entire sieve surface and is evenly distributed, resulting in better screening effect.

[0054] Example 5:

[0055] Based on any of the foregoing embodiments, a guide baffle 8 is provided inside the housing 1 on the right side of the return sprocket 42. The guide baffle 8 is used to restore the overlapping state when the grates 33 run to the upward section.

[0056] In this embodiment, when the screen tooth assembly 3 returns to the right side of the return sprocket 42 and continues to operate to the upward section, it returns to the interlocking state after being limited by the guide baffle 8.

[0057] Furthermore, the inner surface of the guide baffle 8 is provided with a toothed facing layer made of flexible material. The facing layer makes the collision between the teeth 33 and the guide baffle 8 a flexible collision, which can both restore the teeth 33 to their overlapping state and prevent damage to the teeth 33.

[0058] Example 6:

[0059] Based on any of the foregoing embodiments, refer to Figure 1 As shown, a support plate 44 is provided below at least the upper section of the conveyor chain 43.

[0060] In this embodiment, the support plate 44 can support the conveyor chain 43 in the upper section, preventing the conveyor chain 43 from sagging, so that the screen tooth assembly 3 can maintain a good overlap state, thereby keeping the screen surface relatively flat and making the screening effect better.

[0061] Example 7:

[0062] Based on any of the foregoing embodiments, refer to Figure 2 As shown, a feeding roller 21 is provided inside the feeding hopper 2. A gravity gate 22 that cooperates with the feeding roller 21 is provided on the left side of the feeding roller 21. An air duct 23 that tilts to the upper right is provided below the feeding roller 21 in the feeding hopper 2. The left end of the air duct 23 is matched with the material drop point below the feeding roller 21, and the right end is connected to the negative pressure suction device.

[0063] In this embodiment, after the grain material falls into the feed hopper 2, it cannot fall further due to the obstruction of the gravity gate 22, and is evenly spread out in the front-back direction of the feeding roller 21. Then, it falls through the tooth gaps of the feeding roller 21 as it rotates, thereby making the grain and impurities evenly dispersed, facilitating the separation of grain and impurities, and improving the screening effect. The exhaust pipe 23 can suck out lighter and smaller impurities from the falling grain material from the feed hopper 2, achieving a better screening effect.

[0064] Furthermore, a guide plate is provided inside the housing 1 between the feeding roller 21 and the return sprocket 42. The guide plate is used to guide the material falling from the feed hopper 2 to the screen surface formed by the overlapping of the screen tooth assembly 3 in the upper section.

[0065] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0068] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0069] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0070] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grate-type chain plate primary cleaning screen, characterized in that: The system includes a housing (1), a conveying assembly, a driving assembly (5), a screen tooth assembly (3), and a vibration assembly (6). The conveying assembly is installed inside the housing (1) and includes two rows of conveying chains (43) that are spaced apart and run synchronously, a drive sprocket (41) and a return sprocket (42) respectively located at the left and right ends of the housing (1) and meshing with the conveying chains (43). The driving assembly (5) is connected to the drive sprocket (41) and is used to drive the drive sprocket (41) to rotate, thereby driving the conveying chains (43) and the return sprocket (42) to rotate. The screen tooth assembly (3) includes a shaft tube (32) and teeth (33). Both ends of the tube (32) are fixedly connected to the links of the conveyor chain (43) arranged at intervals in front and behind by pins (31). There are multiple grates (33) that are evenly spaced in front and behind and inserted into the tube (32). The tube (32) can rotate relative to the pins (31). Each grate (33) includes an open end and a closed end. The open end includes fork-shaped double-toothed inserts. The closed end is provided with a curved part (331). The tail end of the curved part (331) is provided with a limiting part (332). The vertical distance between the tail end of the limiting part (332) and the insert is less than the radius of the tube (32). 2) The horizontal distance between the tail end and the starting end of the bent part (331) is not greater than the outer diameter of the shaft tube (32). The shaft tube (32) is provided with holes that match the insert teeth. Limiting bolts (34) are provided at both ends of the shaft tube (32). Limiting grooves (311) are provided on the pin shaft (31). The limiting bolts (34) are installed on the shaft tube (32) radially and the ends are placed in the limiting grooves (311). The excitation assembly (6) includes several rockers (61) and rollers (62). The rollers (62) are installed on the spindle (63) and are on the spindle (63) in front of the spindle (63). The spindles (63) are evenly spaced and installed on the housing (1) at equal intervals and below the upper section of the conveyor chain (43). The rocker arm (61) is fixedly installed on the shaft tube (32) at intervals. When the screen tooth assembly (3) runs to the upper section, the height of the end of the rocker arm (61) is lower than the height of the upper end of the roller (62). The vibration assembly (6) is located below the upper section of the screen tooth assembly (3) to make the screen surface formed by the overlapping of the screen tooth assembly (3) in the upper section vibrate. A guide baffle (8) is provided inside the housing (1) on the right side of the return sprocket (42).

2. The grate-type chain plate primary cleaning screen according to claim 1, characterized in that: The height of the end of the rocker arm (61) is higher than the height of the axis of the roller (62).

3. The grate-type chain plate primary cleaning screen according to claim 1, characterized in that: At least the upper section of the conveyor chain (43) is provided with a support plate (44).

4. The grate-type chain plate primary cleaning screen according to claim 1, characterized in that: The inner side of the guide baffle (8) is provided with a toothed veneer made of flexible material.

5. A grate-type chain plate primary cleaning screen according to claim 1, characterized in that: The upper right end of the shell (1) is provided with a feeding hopper (2), the lower middle part of the shell (1) is provided with a collecting hopper (14), and the lower left part is provided with a slurry collecting hopper (13).

6. A grate-type chain plate primary cleaning screen according to claim 5, characterized in that: The feeding hopper (2) is equipped with a feeding roller (21). A gravity gate (22) that cooperates with the feeding roller (21) is provided on the left side of the feeding roller (21). The feeding hopper (2) is located below the feeding roller (21) and is equipped with an air duct (23) that tilts to the upper right. The left end of the air duct (23) matches the material drop point below the feeding roller (21), and the right end is connected to the negative pressure suction device.

7. A grate-type chain plate primary cleaning screen according to claim 6, characterized in that: Inside the housing (1), between the feeding roller (21) and the return sprocket (42), a guide plate is provided. The guide plate is used to guide the material falling from the feed hopper (2) to the screen surface formed by the overlapping of the screen tooth assembly (3) in the upper section.

8. A grate-type chain plate primary cleaning screen according to claim 5, characterized in that: A buffer pad (7) is provided inside the housing (1) at the right upper position of the collection hopper (13). The height of the buffer pad (7) is such that when the grating teeth (33) move from the drive sprocket (41) to the downward section, they collide with the buffer pad (7).

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