A water inlet garbage filtering device for sewage treatment

Abstract

The present invention belongs to the technical field of solid-liquid separation of sewage, and specifically relates to an inlet garbage filtering device for sewage treatment, including a rake tooth mechanical grille, the rake tooth mechanical grille including: two symmetrically arranged annular conveyor chains, a plurality of parallel support shafts are arranged between the two annular conveyor chains; a rake tooth plate, hook teeth are formed on the rake tooth plate, a first limit hole and a second limit hole are arranged on the rake tooth plate; a first notch portion and a second notch portion are also arranged on the rake tooth plate; a flat shaft section is arranged in the area where the support shaft cooperates with the rake tooth plate, and the support shaft is rotatably arranged relative to the annular conveyor chain. When the present invention needs to disassemble the rake tooth plate, the rake tooth plate can be directly taken out by adjusting the support shaft to a suitable angle, which greatly improves the maintenance and repair efficiency of the rake tooth mechanical grille and reduces time and labor costs.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage solid-liquid separation, and in particular relates to an inlet garbage filtering device for sewage treatment. Background Art

[0002] The rake tooth mechanical grille is a commonly used sewage filtration equipment, which is generally set at the upstream of the sewage treatment system to separate the solid garbage in the sewage. The grating of the rake tooth mechanical grille is composed of multiple rake tooth plates, which are sleeved on two adjacent support shafts, and the support shafts are installed on the conveyor chain. During the operation of the conveyor chain, the rake tooth plates pick up the solid garbage in the sewage. The conveyor chain is set through a specific path, so that the hook teeth on the rake tooth plate protrude from the surface of the grille or shrink inside the grille, thereby realizing the capture and release of garbage. After long-term use, the rake tooth plate will wear, break, etc. At this time, the damaged rake tooth plate needs to be replaced. However, the existing rake tooth plates are staggered one by one on the support shaft. Therefore, if one of the rake tooth plates is to be replaced, it is necessary to disassemble all the rake tooth plates assembled later. The operation process is extremely cumbersome, which affects the efficiency of equipment maintenance and increases the time cost and labor cost of equipment maintenance. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an inlet garbage filtering device for sewage treatment, which is convenient for replacing and repairing the rake tooth plates.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides an inlet garbage filtering device for sewage treatment, comprising a rake tooth mechanical grille, wherein the rake tooth mechanical grille comprises:

[0005] Two symmetrically arranged annular conveyor chains, with a plurality of parallel supporting shafts arranged between the two annular conveyor chains;

[0006] A tooth plate, wherein hook teeth are formed on the tooth plate, and a first limiting hole and a second limiting hole are provided on the tooth plate, wherein the first limiting hole and the second limiting hole are respectively pivotally connected to two adjacent support shafts; the tooth plate is also provided with a first notch portion extending from the first limiting hole to an edge of the tooth plate, and a second notch portion extending from the second limiting hole to an edge of the tooth plate, wherein a width of the first notch portion is smaller than a diameter of the first limiting hole, and a width of the second notch portion is smaller than a diameter of the second limiting hole;

[0007] A flat shaft section is provided in the area where the support shaft cooperates with the rake tooth plate, and the cross-section of the flat shaft section has two opposite wide sides and two opposite narrow sides. The support shaft is rotatably arranged relative to the circular conveying chain so that the narrow side of the flat shaft section can be aligned with or staggered with the first notch portion and / or the second notch portion.

[0008] In an optional embodiment of the present invention, the circular conveying chain is formed by a plurality of chain plates pivotally connected, and two adjacent chain plates are pivotally connected to each other via a bushing; the bushing is fixedly connected to one of the two adjacent chain plates, and is rotatably connected to the other; the chain plate is fixedly connected to one of the two adjacent bushings, and is rotatably connected to the other; the support shaft is rotatably arranged in the bushing, and a locking mechanism is provided between the support shaft and the bushing, and the locking mechanism is assembled to be able to lock the support shaft and the bushing at a first preset relative angle, and to be able to release the support shaft and the bushing from the first preset relative angle.

[0009] In an optional embodiment of the present invention, when the support shaft and the bushing are located at the first preset relative angle, the narrow side of the flat shaft section is staggered by 85°-95° ​​from the first notch portion or the second notch portion; and the circular conveyor chain is assembled so that the maximum relative deflection angle between any two adjacent chain plates is less than 85°-95°.

[0010] In an optional embodiment of the present invention, the wide side of the flat shaft segment is arc-shaped, and when the support shaft and the sleeve are located at a second preset relative angle, the narrow side of the flat shaft segment is aligned with the first notch portion or the second notch portion, and the arc center of the wide side is located on the axis of the adjacent support shaft; the first notch portion and / or the second notch portion are arc-shaped notch portions adapted to the cross-sectional shape of the flat shaft.

[0011] In an optional embodiment of the present invention, a keyway is provided on the shaft sleeve, and the chain plate is provided with a first axial hole and a second axial hole respectively cooperating with two adjacent shaft sleeves, wherein the edge of the first axial hole is provided with a flat key cooperating with the keyway.

[0012] In an optional embodiment of the present invention, the locking mechanism includes semi-threaded holes arranged on the outer circumference of the support shaft and the inner circumference of the sleeve, and when the support shaft and the sleeve are located at the first preset relative angle, the two semi-threaded holes are aligned with each other, and the locking mechanism also includes screws installed in the two semi-threaded holes in a detachable manner.

[0013] In an optional embodiment of the present invention, scale lines for indicating the second preset relative angle are provided on the end surfaces of the support shaft and the sleeve.

[0014] In an optional embodiment of the present invention, a plurality of the rake tooth plates are arranged in a plurality of rows along the length direction of the ring conveying chain, the rake tooth plates in two adjacent rows are staggered, and the first limiting holes of the rake tooth plates in one row and the second limiting holes of the rake tooth plates in another row share the same support shaft.

[0015] In an optional embodiment of the present invention, a side guard plate is provided between the rake tooth plate and the endless conveying chain.

[0016] In an optional embodiment of the present invention, a guide wheel is provided between the side guard plate and the endless conveying chain.

[0017] The technical effect of the present invention is that the limiting hole of the rake tooth plate is set to an open structure, and the supporting shaft is set to a flat shaft. The rake tooth plate and the supporting shaft can be prevented from being separated during normal operation by limiting the angle of the supporting shaft. When the rake tooth plate needs to be disassembled, the rake tooth plate can be directly taken out by adjusting the supporting shaft to a suitable angle, which greatly improves the maintenance and inspection efficiency of the rake tooth mechanical grille and reduces time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional diagram of an inlet garbage filtering device for sewage treatment provided by an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A partial enlarged view of I;

[0020] Figure 3 is an exploded view of the assembly structure of the rake tooth plate, the support shaft and the chain plate provided by the embodiment of the present invention;

[0021] Figure 4 is a three-dimensional diagram of a rake plate provided by an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the end structure of a support shaft provided by an embodiment of the present invention;

[0023] Figure 6 is a cross-sectional view of a flat shaft segment provided by an embodiment of the present invention;

[0024] Figure 7 is a three-dimensional diagram of a shaft sleeve provided by an embodiment of the present invention;

[0025] Figure 8 is a three-dimensional diagram of a chain plate provided by an embodiment of the present invention;

[0026] Fig. 9 is a side view of two adjacent chain plates in a first state provided by an embodiment of the present invention;

[0027] Fig.10 is a side view of two adjacent rake tooth plates in a first state provided by an embodiment of the present invention;

[0028] Fig.11 is a side view of two adjacent chain plates in a first state provided by an embodiment of the present invention;

[0029] Fig.12 is a side view of two adjacent rake tooth plates in a first state provided by an embodiment of the present invention;

[0030] Fig.13 is a side view of two adjacent chain plates in a first state provided by an embodiment of the present invention;

[0031] Fig.14 is a side view of two adjacent rake tooth plates in a first state provided by an embodiment of the present invention;

[0032] Fig.15 is a side view of two adjacent chain plates in a first state provided by an embodiment of the present invention;

[0033] Fig.16 is a side view of two adjacent rake tooth plates in a first state provided by an embodiment of the present invention;

[0034] Fig.17 is a side view of two adjacent chain plates in a first state provided by an embodiment of the present invention;

[0035] Fig.18 is a side view of two adjacent rake tooth plates in a first state provided by an embodiment of the present invention;

[0036] Explanation of the reference numerals in the accompanying drawings: 100, rake tooth mechanical grille; 10, ring conveyor chain; 11, chain plate; 111, first axial hole; 112, second axial hole; 113, flat key; 12, bushing; 121, keyway; 20, support shaft; 21, flat shaft section; 211, wide side; 212, narrow side; 30, rake tooth plate; 31, first limiting hole; 32, second limiting hole; 33, first notch portion; 34, second notch portion; 35, hook tooth; 40, side guard plate; 50, spacer; 60, guide wheel; 70, semi-threaded hole; 71, screw; 80, scale line. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0038] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] Rake mechanical screen is a kind of equipment used for water treatment and solid waste separation. It is mainly used in sewage treatment plants, industrial wastewater treatment, drainage systems and other fields to remove larger solid particles and impurities in water. Its structure and working principle are as follows:

[0040] The structure of the mechanical screen with rake teeth includes a screen frame, rake teeth, chains or gears, a cleaning device and a drive system. The screen frame is usually made of corrosion-resistant steel or stainless steel. It supports the entire screen system and is fixed in the channel where the sewage flows. The rake teeth are a series of tooth plates with a certain spacing installed on the mechanical transmission system, which are used to grab solid particles in the water. The rake teeth are usually serrated or hooked to improve the grabbing effect. The chain or gear is a transmission device used to drive the rake teeth, which converts the rotational motion into the up and down or forward and backward motion of the rake teeth. The cleaning device includes a cleaning device and a discharge device, which are used to remove the captured solid particles from the screen and discharge them into a trash can or other treatment device. The drive system includes an electric motor and a reducer, etc., which are responsible for providing the movement power of the rake teeth.

[0041] The working principle of the mechanical screen with rake teeth is as follows: sewage flows into the screen frame through the water inlet of the screen and flows through the part with rake teeth; the mechanical transmission system drives the rake teeth to move along the longitudinal or transverse direction of the screen frame. The rake teeth contact the solid particles in the water flow, grab and remove them; the grabbed solid particles are moved to the top or side of the screen, and then discharged into the trash can or other treatment device through the cleaning device. In addition, the path setting of the chain can be used to make the rake teeth protrude from the screen surface (such as Fig. 9 as shown) or retract the teeth to the inside of the grille surface (as shown Fig.13 As shown); the water flow after being processed by the rake teeth continues to flow through the mesh holes of the grille, thereby completing the solid particle removal process.

[0042] After long-term use, the tooth plates will be worn out, broken, etc., and the damaged tooth plates need to be replaced. However, the existing tooth plates are staggered and sleeved on the support shaft one by one. Therefore, if one of the tooth plates is to be replaced, all the tooth plates assembled later need to be disassembled. The operation process is very cumbersome, which affects the equipment maintenance efficiency and increases the time cost and labor cost of equipment maintenance. To this end, the present invention sets the limit hole of the tooth plate to an open structure, and sets the support shaft to a flat shaft. By limiting the angle of the support shaft, the tooth plate can be prevented from being separated from the support shaft during normal operation. When the tooth plate needs to be disassembled, the tooth plate can be directly taken out by adjusting the support shaft to a suitable angle, which greatly improves the maintenance and repair efficiency of the rake mechanical grille and reduces time and labor costs.

[0043] See also Figure 1-18 As shown, the technical solution of the present invention is described in detail below in conjunction with specific embodiments:

[0044] The inlet garbage filtering device for sewage treatment provided by the embodiment of the present invention includes a rake tooth mechanical grille 100. It should be noted that the present invention mainly improves the assembly structure of the rake tooth plate 30 and the support shaft 20 of the rake tooth mechanical grille 100. Therefore, the following embodiments will focus on this part of the content. As for the driving structure, cleaning structure, etc. of the rake tooth mechanical grille 100, they can be implemented with reference to the prior art and will not be repeated in the present invention.

[0045] See also Figure 2-18 As shown, the rake tooth mechanical grille 100 includes two symmetrically arranged annular conveyor chains 10 and a rake tooth plate 30; a plurality of parallel support shafts 20 are arranged between the two annular conveyor chains 10; hook teeth 35 are formed on the rake tooth plate 30, and a first limiting hole 31 and a second limiting hole 32 are provided on the rake tooth plate 30, and the first limiting hole 31 and the second limiting hole 32 are respectively pivotally connected to the two adjacent support shafts 20; the rake tooth plate 30 is also provided with a first notch portion 33 extending from the first limiting hole 31 to the edge of the rake tooth plate 30, and a first notch portion 33 extending from the second limiting hole 32 to the edge of the rake tooth plate 30. The second notch portion 34 on the edge of the rake tooth plate 30, the width of the first notch portion 33 is smaller than the diameter of the first limiting hole 31, and the width of the second notch portion 34 is smaller than the diameter of the second limiting hole 32; the area where the support shaft 20 cooperates with the rake tooth plate 30 is provided with a flat shaft section 21, and the cross-section of the flat shaft section 21 has two opposite wide sides 211 and two opposite narrow sides 212, and the support shaft 20 is rotatably arranged relative to the circular conveyor chain 10 so that the narrow side 212 of the flat shaft section 21 can be aligned or staggered with the first notch portion 33 and / or the second notch portion 34.

[0046] It should be understood that since the present invention sets the limiting hole of the rake plate 30 as an open structure and sets the support shaft 20 as a flat shaft, it is possible to limit the angle of the support shaft 20 to avoid the rake plate 30 from being separated from the support shaft 20 during normal operation. At the same time, when the rake plate 30 needs to be disassembled, the rake plate 30 can be directly taken out by simply adjusting the support shaft 20 to a suitable angle, which greatly improves the maintenance and inspection efficiency of the rake mechanical grille 100 and reduces time and labor costs.

[0047] See also Fig. 9 As shown, in an optional embodiment of the present invention, the circular conveyor chain 10 is formed by pivoting a plurality of chain plates 11, and two adjacent chain plates 11 are pivotally connected to each other via a shaft sleeve 12; the shaft sleeve 12 is fixedly connected to one of the two adjacent chain plates 11, and is rotatably connected to the other; the chain plate 11 is fixedly connected to one of the two adjacent shaft sleeves 12, and is rotatably connected to the other; the support shaft 20 is rotatably disposed in the shaft sleeve 12, and a locking mechanism is provided between the support shaft 20 and the shaft sleeve 12, and the locking mechanism is assembled to be able to lock the support shaft 20 and the shaft sleeve 12 at a first preset relative angle, and to be able to release the support shaft 20 and the shaft sleeve 12 from the first preset relative angle. When the support shaft 20 and the bushing 12 are located at the first preset relative angle, the narrow side 212 of the flat shaft section 21 is staggered by 85°-95°, preferably 90°, from the first notch portion 33 or the second notch portion 34; the ring conveyor chain 10 is assembled so that the maximum relative deflection angle between any two adjacent chain plates 11 is less than 85°-95°.

[0048] It should be understood that when the locking mechanism is locked, the support shaft 20 and the shaft sleeve 12 are relatively fixed, and the shaft sleeve 12 and one of the chain plates 11 are relatively fixed, so the support shaft 20 is also fixed relative to this chain plate 11, because the two limiting holes on the rake tooth plate 30 are respectively pivotally connected to the support shaft 20 at both ends of the chain plate 11, so the rake tooth plate 30 is also fixed relative to the chain plate 11, which means that the rake tooth plate 30 must be in a relatively fixed relationship with one of the support shafts 20, and in a relatively rotating relationship with the other support shaft 20, and the relative rotation angle between the rake tooth plate 30 and the other support shaft 20 is determined by the relative deflection angle between the two adjacent chain plates 11. Therefore, as long as the relative deflection angle of the two adjacent chain plates 11 is controlled within a certain range, the narrow side 212 of the flat shaft section 21 can be avoided from being aligned with the notch portion, and the rake tooth plate 30 can be prevented from separating from the support shaft 20. The relative deflection between two adjacent chain plates 11 generally occurs at the sprocket. As long as the radius of the sprocket is large enough, the relative deflection angle between the two adjacent chain plates 11 can be effectively reduced. Therefore, it is easy to limit the maximum deflection angle between the two adjacent chain plates 11 to within 85°.

[0049] See also Figure 6 , 10 As shown, in an optional embodiment of the present invention, the wide side 211 of the flat shaft segment 21 is arc-shaped, and when the support shaft 20 and the shaft sleeve 12 are located at a second preset relative angle, the narrow side 212 of the flat shaft segment 21 is aligned with the first notch portion 33 or the second notch portion 34, and the arc center of the wide side 211 is located on the axis of the adjacent support shaft 20; the first notch portion 33 and / or the second notch portion 34 are arc-shaped notches adapted to the cross-sectional shape of the flat shaft. This arrangement is to enable the removal of the rake tooth plate 30 by adjusting only the angle of one support shaft 20, and the specific removal process will be described in the subsequent working principle.

[0050] See also Figure 7 , 8 As shown, in an optional embodiment of the present invention, a keyway 121 is provided on the shaft sleeve 12, and the chain plate 11 is provided with a first axial hole 111 and a second axial hole 112 respectively cooperating with two adjacent shaft sleeves 12, wherein the edge of the first axial hole 111 is provided with a flat key 113 cooperating with the keyway 121.

[0051] See also Figure 5 , 7 As shown, in an optional embodiment of the present invention, the locking mechanism includes a semi-threaded hole 70 provided on the outer circumferential surface of the support shaft 20 and the inner circumferential surface of the sleeve 12, and when the support shaft 20 and the sleeve 12 are located at the first preset relative angle, the two semi-threaded holes 70 are aligned with each other, and the locking mechanism also includes a screw 71 installed in the two semi-threaded holes 70 in a detachable manner.

[0052] See also Fig. 9 , 15 As shown, in an optional embodiment of the present invention, scale lines 80 for indicating the second preset relative angle are provided on the end surfaces of the support shaft 20 and the sleeve 12 .

[0053] See also Figure 2 As shown, in an optional embodiment of the present invention, a plurality of the rake tooth plates 30 are arranged in a plurality of rows along the length direction of the endless conveyor chain 10, and the two adjacent rows of the rake tooth plates 30 are arranged in a staggered manner, and the first limiting holes 31 of one row of the rake tooth plates 30 and the second limiting holes 32 of the other row of the rake tooth plates 30 share the same support shaft 20. In this way, the rake tooth density can be increased to prevent the gaps between the rake teeth from being too large and affecting the filtering effect. A spacer 50 is provided between adjacent rake tooth plates 30 on the same support shaft 20.

[0054] See also Figure 2 ,3 As shown, in an optional embodiment of the present invention, a side guard plate 40 is provided between the rake tooth plate 30 and the ring conveyor chain 10 to prevent garbage from entering the movement space of the chain plate 11.

[0055] See also Figure 3 As shown, in an optional embodiment of the present invention, a guide wheel 60 is provided between the side guard plate 40 and the ring conveyor chain 10, and the guide wheel 60 cooperates with the guide rail provided on the frame to provide support while reducing running resistance.

[0056] The following combination Figure 9-18 The principle of the present invention is described in detail:

[0057] by Fig. 9 For example, in the figure, each sleeve 12 is fixedly connected to the chain plate 11 on its right side, and is rotatably connected to the chain plate 11 on its left side, and the support shaft 20 and the sleeve 12 are located at a first preset relative angle; Fig. 9 The corresponding states of the rake teeth plates 30 are as follows: Fig.10 As shown, at this time, each flat shaft is staggered with each notch on the rake tooth plate 30, thereby preventing the rake tooth plate 30 from separating from the flat shaft. During the normal operation of the grille, the relative deflection angle between two adjacent chain plates 11 is generally limited to Fig.11 , 12 The angles shown and Fig.13 , 14 As can be seen from the figure, when the chain plate 11 deflects within this angle range, the narrow side 212 of the flat shaft can never be aligned with the first notch 33 and the second notch 34, which ensures that the rake plate 30 and the support shaft 20 can be reliably connected during the normal movement of the grille. When the left rake plate 30 needs to be disassembled, just remove the screw 71 between the middle support shaft 20 and the shaft sleeve 12, and then rotate the support shaft 20 to Fig.15 As shown in the position, the support shaft 20 and the sleeve 12 are at a second preset relative angle, and the matching state of the middle flat shaft and the second limiting hole 32 of the left rake tooth plate 30 is as shown in FIG. Fig.16 As shown in the figure, the narrow side 212 of the flat shaft is aligned with the second notch 34 of the left rake tooth plate 30. The operator only needs to clamp the right end of the left rake tooth plate 30 and then pull it upward to flip the left rake tooth plate 30 to the right side. Fig.18 The position shown, Fig.18 When the left tooth plate 30 is in the position shown, the first notch 33 of the left tooth plate 30 is aligned with the narrow side 212 of the left flat shaft. At this time, the left tooth plate 30 can be removed from the left flat shaft along the first notch 33. The installation process of the new tooth plate 30 only needs to be reversed according to the above steps, which will not be repeated here. In this way, only one support shaft 20 needs to be rotated to realize the removal and installation of a specific tooth plate 30, which greatly improves the maintenance and repair efficiency of the tooth plate 30.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0059] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A water inlet garbage filtering device for sewage treatment, characterized in that: It comprises a rake tooth mechanical grille (100), wherein the rake tooth mechanical grille (100) comprises: Two symmetrically arranged annular conveyor chains (10), with a plurality of parallel supporting shafts (20) being provided between the two annular conveyor chains (10); A rake tooth plate (30), wherein hook teeth (35) are formed on the rake tooth plate (30), and a first limiting hole (31) and a second limiting hole (32) are provided on the rake tooth plate (30), wherein the first limiting hole (31) and the second limiting hole (32) are respectively pivotally connected to two adjacent support shafts (20); the rake tooth plate (30) is also provided with a first notch portion (33) extending from the first limiting hole (31) to an edge of the rake tooth plate (30), and a second notch portion (34) extending from the second limiting hole (32) to an edge of the rake tooth plate (30), wherein the width of the first notch portion (33) is smaller than the diameter of the first limiting hole (31), and the width of the second notch portion (34) is smaller than the diameter of the second limiting hole (32); A flat shaft section (21) is provided in the area where the support shaft (20) cooperates with the rake tooth plate (30), and the cross section of the flat shaft section (21) has two opposite wide sides (211) and two opposite narrow sides (212), and the support shaft (20) is rotatably arranged relative to the endless conveyor chain (10) so that the narrow side (212) of the flat shaft section (21) can be aligned with or staggered with the first notch portion (33) and / or the second notch portion (34); The annular conveyor chain (10) is formed by pivoting a plurality of chain plates (11), and two adjacent chain plates (11) are pivotally connected to each other via a shaft sleeve (12); the shaft sleeve (12) is fixedly connected to one of the two adjacent chain plates (11) and is rotatably connected to the other; the chain plate (11) is fixedly connected to one of the two adjacent shaft sleeves (12) and is rotatably connected to the other; the support shaft (20) is rotatably arranged in the shaft sleeve (12), and a locking mechanism is provided between the support shaft (20) and the shaft sleeve (12), and the locking mechanism is assembled to be able to lock the support shaft (20) and the shaft sleeve (12) at a first preset relative angle, and to be able to release the support shaft (20) and the shaft sleeve (12) from the first preset relative angle; When the support shaft (20) and the shaft sleeve (12) are located at the first preset relative angle, the narrow side (212) of the flat shaft section (21) is offset from the first notch portion (33) or the second notch portion (34) by 85°-95°; the endless conveyor chain (10) is assembled so that the maximum relative deflection angle between any two adjacent chain plates (11) is less than 85°-95°; The wide side (211) of the flat shaft section (21) is arc-shaped; when the support shaft (20) and the shaft sleeve (12) are located at a second preset relative angle, the narrow side (212) of the flat shaft section (21) is aligned with the first notch portion (33) or the second notch portion (34), and the arc center of the wide side (211) is located on the axis of the adjacent support shaft (20); the first notch portion (33) and / or the second notch portion (34) are arc-shaped notch portions adapted to the cross-sectional shape of the flat shaft.

2. The inlet garbage filtering device for sewage treatment according to claim 1 is characterized in that: The shaft sleeve (12) is provided with a keyway (121), and the chain plate (11) is provided with a first shaft hole (111) and a second shaft hole (112) respectively matched with two adjacent shaft sleeves (12), wherein the edge of the first shaft hole (111) is provided with a flat key (113) matched with the keyway (121).

3. The inlet garbage filtering device for sewage treatment according to claim 1 is characterized in that: The locking mechanism comprises a semi-threaded hole (70) provided on the outer circumferential surface of the support shaft (20) and the inner circumferential surface of the shaft sleeve (12); when the support shaft (20) and the shaft sleeve (12) are located at the first preset relative angle, the two semi-threaded holes (70) are aligned with each other; and the locking mechanism further comprises a screw (71) installed in the two semi-threaded holes (70) in a detachable manner.

4. The inlet garbage filtering device for sewage treatment according to claim 1 is characterized in that: Scale lines (80) for indicating the second preset relative angle are provided on the end surfaces of the support shaft (20) and the shaft sleeve (12).

5. The inlet garbage filtering device for sewage treatment according to claim 1 is characterized in that: The plurality of rake tooth plates (30) are arranged in a plurality of rows along the length direction of the ring-shaped conveyor chain (10), the rake tooth plates (30) in two adjacent rows are arranged in a staggered manner, and the first limiting holes (31) of the rake tooth plates (30) in one row and the second limiting holes (32) of the rake tooth plates (30) in another row share the same support shaft (20).

6. The inlet garbage filtering device for sewage treatment according to claim 1, characterized in that: A side guard plate (40) is provided between the rake tooth plate (30) and the endless conveyor chain (10).

7. The inlet garbage filtering device for sewage treatment according to claim 6, characterized in that: A guide wheel (60) is provided between the side guard plate (40) and the endless conveying chain (10).

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