A scraper mechanism for a primary sedimentation tank

Abstract

The present invention belongs to the technical field of sewage treatment, and specifically relates to a primary sedimentation tank scraper mechanism, comprising: at least two annular conveyor chains, the annular conveyor chains being tensioned in the primary sedimentation tank by a number of sprockets, and forming a first straight portion and a second straight portion of the annular conveyor chains; a mounting seat fixedly connected to the chain links of the annular conveyor chains; a scraper mounted on the mounting seat; a suds discharge trough mounted in the primary sedimentation tank; the first straight section being configured to be able to pass over the notch of the suds discharge trough, and the first straight section being arranged close to the notch of the suds discharge trough. The present invention arranges the suds discharge trough inside the movement path of the annular conveyor chain, so that the conveyor chain can pass over the suds discharge trough, thereby ensuring that the scraper can completely push the suds into the suds discharge trough, avoiding suds accumulation or overflow, and improving the suds discharge efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a scraper mechanism for a primary sedimentation tank. Background Art

[0002] The primary sedimentation tank is located in the upstream position of the entire sewage treatment system. It is mainly used to filter some coarse particles in the sewage. The general working principle of the primary sedimentation tank is as follows: sewage flows into the primary sedimentation tank from the water inlet. A slag trough is provided at the bottom of the primary sedimentation tank near the water inlet. As the sewage flows from the water inlet to the water outlet, coarse particles settle on the bottom of the tank. At the same time, an aeration device is provided in the primary sedimentation tank. The aeration device can make the suspended matter in the sewage adhere to the bubbles and produce foam on the surface of the tank. The scraper mechanism is installed in the primary sedimentation tank. The scraper passes through the bottom and surface of the tank in turn. When the scraper passes through the bottom of the tank, it can scrape the deposited coarse particles into the slag trough. The mud and sand in the slag trough are sucked to other processes through the slag pipe. At the same time, when the scraper passes through the surface of the tank, it can scrape the foam into the foam collection tank, and then the foam is also sucked to other processes through the pipeline.

[0003] However, a defect of the existing scraper mechanism is that the froth collection tank is generally arranged outside the scraper movement path. For example, in the Chinese utility model patent "A chain-type mud scraper" (Announcement No.: CN212187929U), the scraper can only push the froth to a position close to the froth collection tank, but cannot send the froth completely into the froth collection tank. On the one hand, this will cause the froth to accumulate on the inlet side of the collection tank, causing the froth to overflow. On the other hand, a large amount of froth will be attached to the scraper when it moves downward, and this froth will be brought back below the water surface by the scraper, affecting the separation efficiency. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a primary sedimentation tank scraper mechanism that can improve the efficiency of froth discharge.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a primary sedimentation tank scraper mechanism, comprising:

[0006] At least two endless conveyor chains, the endless conveyor chains being tensioned in the primary settling tank by a plurality of sprockets, and forming a first straight portion and a second straight portion in the endless conveyor chains, wherein the first straight portion is disposed near the upper end of the primary settling tank, and the second straight portion is disposed near the bottom of the primary settling tank;

[0007] A mounting seat fixedly connected to the chain links of the endless conveyor chain, wherein a plurality of mounting seats are arranged at intervals along the length direction of the endless conveyor chain;

[0008] A scraper is mounted on the mounting seat, wherein the length direction of the scraper is horizontally arranged and the length direction of the scraper is perpendicular to the moving direction of the endless conveyor chain;

[0009] A froth discharge trough is installed in the primary sedimentation tank, with the notch of the froth discharge trough facing upwards;

[0010] The first straight section is configured to be able to pass over the slot opening of the froth discharge groove, and the first straight section is arranged closely to the slot opening of the froth discharge groove.

[0011] In an optional embodiment of the present invention, the scraper is movably connected to the mounting seat along a first direction, the first direction is perpendicular to the movement direction of the circular conveyor chain, and the first direction is perpendicular to the length direction of the scraper; a guiding mechanism is provided in the foam discharge trough, and the guiding mechanism is configured so that when the scraper passes over the foam discharge trough, the guiding mechanism can drive the scraper to vibrate back and forth along the first direction.

[0012] In an optional embodiment of the present invention, a first compression spring is provided between the scraper and the mounting seat, and the first compression spring is configured so that when the scraper is located in the first straight section, the elastic force of the first compression spring can drive the scraper to move downward relative to the mounting seat.

[0013] In an optional embodiment of the present invention, the guiding mechanism includes a first wedge block, which is fixed relative to the wall of the primary sedimentation tank. A second wedge block is provided on the front side of the scraper movement direction, and the first wedge block is located on the movement path of the second wedge block.

[0014] In an optional embodiment of the present invention, limiting ribs are provided on both sides of the mounting seat. When the first wedge block collides with the second wedge block, the bottom surface of the first wedge block fits into the top surface of the limiting ribs to prevent the mounting seat from moving along the first direction.

[0015] In an optional embodiment of the present invention, the guiding mechanism includes a support block, which is pivotally connected to the wall of the primary sedimentation tank through a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are parallel to each other and have the same length, a stopper is provided on the support block, and the stopper is movably connected to the support block in the vertical direction, and a linkage mechanism is provided between the stopper and the first connecting rod, and the linkage mechanism is configured so that when the first connecting rod is at a first angle, the linkage mechanism can drive the stopper to protrude from the top surface of the support block, and when the first connecting rod is at a second angle, the linkage mechanism can drive the stopper to retract below the top surface of the support block; when the first connecting rod is at the first angle, the top surface of the support block is flush with the top surface of the mounting seat on the first straight portion, and when the first connecting rod is at the second angle, the top surface of the support block is higher than the top surface of the mounting seat on the first straight portion, and one end of the first connecting rod is provided with a torsion spring, and the torsion spring is configured so that its elastic force can drive the first connecting rod to swing from the second angle to the first angle.

[0016] In an optional embodiment of the present invention, the linkage mechanism includes a second compression spring and a cam, the second compression spring is installed between the stop block and the support block, and the second compression spring is configured so that its elastic force can drive the stop block to move downward relative to the support block, the cam is installed on the pivot between the first connecting rod and the support block, the cam is fixed to the pivot, and the pivot is fixed to the first connecting rod, the wheel surface of the cam is in contact with the bottom surface of the stop block, and when the first connecting rod swings from the second angle to the first angle, the cam can squeeze the stop block upward so that the stop block protrudes above the top surface of the support block.

[0017] In an optional embodiment of the present invention, a first supporting rail is provided on the upper portion of the wall of the primary settling tank, and both ends of the scraper on the first straight section are overlapped on the first supporting rail.

[0018] In an optional embodiment of the present invention, a second supporting rail is provided on the bottom of the primary settling tank, and the scraper on the second straight section is overlapped on the second supporting rail.

[0019] In an optional embodiment of the present invention, the cross-sectional outer contour of the scraper is T-shaped, and the wing portion of the T-shape is arranged away from the endless conveyor chain.

[0020] The technical effect of the present invention is that the present invention arranges the foam discharge groove on the inner side of the movement path of the annular conveyor chain, so that the conveyor chain can pass over the foam discharge groove, thereby ensuring that the scraper can completely push the foam into the foam discharge groove, avoiding foam accumulation or overflow, and improving the foam discharge efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the primary sedimentation tank scraper mechanism provided by an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 I local enlarged view;

[0023] Figure 3 is a perspective view of a guide mechanism provided in one embodiment of the present invention;

[0024] Figure 4 is a cross-sectional view of a guide mechanism provided by another embodiment of the present invention;

[0025] Figure 5 is a perspective view of a guide mechanism provided by another embodiment of the present invention;

[0026] Explanation of the accompanying symbols: 10. Primary sedimentation tank; 101. Water inlet tank; 102. Water outlet tank; 11. Slag discharge trough; 12. Slag discharge pipe; 13. First supporting slide rail; 14. Second supporting slide rail; 15. Aeration pipe; 20. Annular conveyor chain; 201. First straight section; 202. Second straight section; 21. Sprocket; 30. Scraper; 31. Mounting seat; 311. Limiting rib; 32. First compression spring; 33. Second wedge block; 40. Foam discharge trough; 41. Foam discharge pipe; 50. Motor; 61. First wedge block; 62. Support block; 63. Stop block; 64. Second compression spring; 65. First connecting rod; 66. Second connecting rod; 67. Cam; 68. Torsion spring. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed 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 unless they conflict.

[0028] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not 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 complex.

[0029] See also Figure 1 As shown, the primary sedimentation tank scraper mechanism provided by the embodiment of the present invention is used to transfer the sediment and foam in the primary sedimentation tank 10.

[0030] In a specific embodiment, an inlet tank 101 and an outlet tank 102 can be respectively provided at the two ends of the primary sedimentation tank 10, for example, wherein the bottom of the inlet tank 101 is connected with the bottom of the primary sedimentation tank 10 to ensure that coarse particle impurities in the sewage will not be deposited in the inlet tank 101, and the top of the outlet tank 102 is connected with the top of the primary sedimentation tank 10, which can prevent the mud and sand at the bottom of the primary sedimentation tank 10 from entering the outlet tank 102; a slag discharge trough 11 is provided at one end of the bottom of the primary sedimentation tank 10 close to the inlet tank 101, and the slag discharge trough 11 is connected to a slag discharge pipe 12 for discharging mud and sand; an aeration pipe 15 is also provided in the primary sedimentation tank 10.

[0031] The scraper mechanism of the present invention is installed in the primary sedimentation tank 10 . Specifically, the scraper mechanism includes at least two endless conveying chains 20 , a mounting seat 31 , a scraper 30 and a froth discharge chute 40 .

[0032] The annular conveyor chain 20 is tensioned in the primary sedimentation tank 10 by a plurality of sprockets 21, and the annular conveyor chain 20 forms a first straight portion and a second straight portion, wherein the first straight portion is arranged close to the upper end of the primary sedimentation tank 10, and the second straight portion is arranged close to the bottom of the primary sedimentation tank 10; it should be understood that the scraper mechanism should also be provided with a necessary driving device. In a specific embodiment, the driving device can be, for example, a motor 50. The motor 50 can be installed above the primary sedimentation tank 10, for example. The motor 50 can be connected to any group of sprockets 21 on the annular conveyor chain 20 through a sprocket mechanism to drive the annular conveyor chain 20 to operate.

[0033] In actual application, the first straight portion moves from the water inlet pool 101 to the water outlet pool 102. Figure 1 As an example, the first straight portion moves from left to right; the second straight portion moves from the outlet pool 102 side to the inlet pool 101 side. Figure 1 Taking the shown orientation as an example, the second straight portion moves from right to left.

[0034] See also Figure 1 、 2 As shown, the mounting seat 31 is fixedly connected to the chain links of the circular conveyor chain 20, and multiple mounting seats 31 are arranged at intervals along the length direction of the circular conveyor chain 20; in a preferred embodiment, the length of the mounting seat 31 can be, for example, the same as the length of a single link in the circular conveyor chain 20, or less than the length of a single link, so as to avoid the mounting seat 31 affecting the joint movement of the circular conveyor chain 20.

[0035] See also Figure 2As shown, the scraper 30 is installed on the mounting seat 31, and the length direction of the scraper 30 is set horizontally, and the length direction of the scraper 30 is perpendicular to the movement direction of the circular conveyor chain 20; specifically, the scraper 30 and the mounting seat 31 should be located on the outer ring side of the circular conveyor chain 20 to avoid interference with the engagement between the circular conveyor chain and the sprocket 21.

[0036] See also Figure 1 The froth discharge trough 40 is installed in the primary sedimentation tank 10, and the notch of the froth discharge trough 40 is set upward; the first straight section 201 is configured to be able to pass over the notch of the froth discharge trough 40, and the first straight section 201 is set close to the notch of the froth discharge trough 40, and the froth discharge trough 40 is connected to a froth discharge pipe 41.

[0037] It should be understood that the present invention arranges the foam discharge groove 40 on the inner side of the movement path of the annular conveyor chain 20, so that the conveyor chain can pass over the foam discharge groove 40, thereby ensuring that the scraper 30 can completely push the foam into the foam discharge groove 40, avoiding the accumulation and overflow of foam, and improving the foam discharge efficiency.

[0038] See also Figure 2 、 3 As shown, in an optional embodiment of the present invention, the scraper 30 is movably connected to the mounting seat 31 along a first direction, the first direction is perpendicular to the movement direction of the ring conveyor chain 20, and the first direction is perpendicular to the length direction of the scraper 30; a guiding mechanism is provided in the froth discharge trough 40, and the guiding mechanism is configured so that when the scraper 30 passes over the froth discharge trough 40, the guiding mechanism can drive the scraper 30 to vibrate back and forth along the first direction. It should be understood that the present invention sets the scraper 30 as a floating structure. When the scraper 30 passes through the foam discharge trough 40, the guide mechanism drives the scraper 30 to vibrate, so that the foam attached to the scraper 30 is fully removed, preventing the foam from re-entering the water surface with the scraper 30, thereby improving the efficiency of suspended matter separation; in addition, since the present invention extends the movement path of the scraper 30 toward the water outlet pool 102, there is no obstruction between the water entry area of the scraper 30 and the water outlet pool 102. Therefore, the present invention can shake off the foam attached to the scraper 30 through the above-mentioned vibration, and can further prevent the foam from flowing into the water outlet pool 102.

[0039] See also Figure 1As shown, in an optional embodiment of the present invention, a first compression spring 32 is provided between the scraper 30 and the mounting seat 31. The first compression spring 32 is configured such that when the scraper 30 is located in the first straight section 201, the elastic force of the first compression spring 32 can drive the scraper 30 to move downward relative to the mounting seat 31. It should be understood that the first compression spring 32 can keep the scraper 30 in close contact with the mounting seat 31 under normal conditions to achieve a normal scraping and pushing function. However, when the guide mechanism lifts the scraper 30, the first compression spring 32 can provide a large acceleration to the scraper 30 when the scraper 30 separates from the guide mechanism, causing the scraper 30 to collide with the mounting seat 31, ensuring that the foam on the scraper 30 is fully removed.

[0040] Example 1

[0041] See also Figure 2 、 3 As shown, in an optional embodiment of the present invention, the guiding mechanism includes a first wedge 61, which is fixed relative to the wall of the primary settling tank 10. A second wedge 33 is provided on the front side of the movement direction of the scraper 30, and the first wedge 61 is located on the movement path of the second wedge 33. Furthermore, limiting ribs 311 are provided on both sides of the mounting seat 31. When the first wedge 61 contacts the second wedge 33, the bottom surface of the first wedge 61 fits against the top surface of the limiting rib 311 to prevent the mounting seat 31 from moving in the first direction. It should be understood that the limiting rib 311 can prevent the conveyor chain from being lifted during the lifting of the scraper 30, thereby affecting the normal operation of other scrapers 30.

[0042] Example 2

[0043] See also Figure 4 、 5As shown, this embodiment provides an alternative to the guiding mechanism. Specifically, in this embodiment, the guiding mechanism includes a support block 62, and the support block 62 is pivotally connected to the pool wall of the primary sedimentation tank 10 through a first connecting rod 65 and a second connecting rod 66. The first connecting rod 65 and the second connecting rod 66 are parallel to each other and have the same length. A stopper 63 is provided on the support block 62, and the stopper 63 is movably connected to the support block 62 in the vertical direction. A linkage mechanism is provided between the stopper 63 and the first connecting rod 65, and the linkage mechanism is configured so that when the first connecting rod 65 is at a first angle, the linkage mechanism can drive the stopper 63 to protrude from the support block. The top surface of the support block 62, and when the first connecting rod 65 is at the second angle, the linkage mechanism can drive the stop block 63 to retract below the top surface of the support block 62; when the first connecting rod 65 is at the first angle, the top surface of the support block 62 is flush with the top surface of the mounting seat 31 on the first straight portion, and when the first connecting rod 65 is at the second angle, the top surface of the support block 62 is higher than the top surface of the mounting seat 31 on the first straight portion, and one end of the first connecting rod 65 is provided with a torsion spring 68, and the torsion spring 68 is configured so that its elastic force can drive the first connecting rod 65 to swing from the second angle to the first angle.

[0044] Preferably, the linkage mechanism includes a second compression spring 64 and a cam 67, the second compression spring 64 is installed between the stop block 63 and the support block 62, and the second compression spring 64 is configured so that its elastic force can drive the stop block 63 to move downward relative to the support block 62, the cam 67 is installed on the pivot between the first connecting rod 65 and the support block 62, the cam 67 is fixed to the pivot, and the pivot is fixed to the first connecting rod 65, the wheel surface of the cam 67 is in contact with the bottom surface of the stop block 63, and when the first connecting rod 65 swings from the second angle to the first angle, the cam 67 can squeeze the stop block 63 upward so that the stop block 63 protrudes above the top surface of the support block 62.

[0045] It should be understood that since the span of the first straight portion and the second straight portion is long, the weight of the annular conveyor chain itself plus the weight of the scraper 30 will cause the first straight portion and the second straight portion to sag. For this reason, in an optional embodiment of the present invention, a first supporting rail 13 is provided on the upper part of the wall of the primary sedimentation tank 10, and the two ends of the scraper 30 on the first straight section 201 are overlapped on the first supporting rail 13; a second supporting rail 14 is provided on the bottom of the primary sedimentation tank 10, and the scraper 30 on the second straight section 202 is overlapped on the second supporting rail 14, thereby ensuring that the scraper 30 can strictly move along the predetermined trajectory on the first straight portion and the second straight portion.

[0046] In an optional embodiment of the present invention, the cross-sectional outer contour of the scraper 30 is T-shaped, and the T-shaped wings are arranged away from the endless conveyor chain 20. In some other embodiments, the scraper 30 can also be made of profiles with other cross-sectional shapes.

[0047] In summary, the present invention arranges the foam discharge trough 40 on the inner side of the movement path of the circular conveyor chain 20, so that the conveyor chain can pass over the foam discharge trough 40, thereby ensuring that the scraper 30 can completely push the foam into the foam discharge trough 40, avoiding the accumulation and overflow of foam, and improving the foam discharge efficiency; the present invention arranges the scraper 30 as a floating structure. When the scraper 30 passes through the foam discharge trough 40, the guide mechanism drives the scraper 30 to vibrate, so that the foam attached to the scraper 30 is fully removed, avoiding the foam from entering the water surface again with the scraper 30, thereby improving the suspended matter separation efficiency; in addition, since the present invention extends the movement path of the scraper 30 toward the water outlet pool 102, there is no obstruction between the water entry area of the scraper 30 and the water outlet pool 102. Therefore, the present invention shakes off the foam attached to the scraper 30 through the above-mentioned vibration, and can also further prevent the foam from flowing into the water outlet pool 102.

[0048] 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 skilled in 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 one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0049] In the description herein, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the 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, assemblies, 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 the embodiments of the present invention.

[0050] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0051] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0052] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0053] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0054] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and appreciate, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, modifications may be made to the present invention in light of the above description of the illustrated embodiments of the present invention, and such modifications will be within the spirit and scope of the present invention.

[0055] Systems and methods have been generally described herein in detail to facilitate understanding of the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of these specific details, or with other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0056] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are contemplated within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the claimed invention. Thus, many modifications may be made to adapt a particular environment or material to the true scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the claims below and / or to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention is intended to include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A primary sedimentation tank scraper mechanism, characterized in that: include: At least two endless conveyor chains, the endless conveyor chains being tensioned in the primary settling tank by a plurality of sprockets, and forming a first straight portion and a second straight portion in the endless conveyor chains, wherein the first straight portion is disposed near the upper end of the primary settling tank, and the second straight portion is disposed near the bottom of the primary settling tank; A mounting seat fixedly connected to the chain links of the endless conveyor chain, wherein a plurality of mounting seats are arranged at intervals along the length direction of the endless conveyor chain; A scraper is mounted on the mounting seat, wherein the length direction of the scraper is horizontally arranged and the length direction of the scraper is perpendicular to the moving direction of the endless conveyor chain; A froth discharge trough is installed in the primary sedimentation tank, with the notch of the froth discharge trough facing upwards; The first straight section is configured to be able to pass over the notch of the froth discharge trough, and the first straight section is arranged closely to the notch of the froth discharge trough; The scraper is movably connected to the mounting seat along a first direction, the first direction is perpendicular to the movement direction of the circular conveyor chain, and the first direction is perpendicular to the length direction of the scraper; a guiding mechanism is provided in the foam discharge trough, and the guiding mechanism is configured so that when the scraper passes over the foam discharge trough, the guiding mechanism can drive the scraper to vibrate back and forth along the first direction.

2. The primary sedimentation tank scraper mechanism according to claim 1, characterized in that: A first compression spring is provided between the scraper and the mounting seat. The first compression spring is configured so that when the scraper is located in the first straight section, the elastic force of the first compression spring can drive the scraper to move downward relative to the mounting seat.

3. The primary sedimentation tank scraper mechanism according to claim 2, characterized in that: The guiding mechanism includes a first wedge block, which is fixed relative to the wall of the primary sedimentation tank. A second wedge block is provided on the front side of the scraper movement direction, and the first wedge block is located on the movement path of the second wedge block.

4. The primary sedimentation tank scraper mechanism according to claim 3, characterized in that: Limiting ribs are provided on both sides of the mounting seat. When the first wedge block contacts the second wedge block, the bottom surface of the first wedge block fits against the top surface of the limiting ribs to prevent the mounting seat from moving along the first direction.

5. The primary sedimentation tank scraper mechanism according to claim 2, characterized in that: The guide mechanism includes a support block, which is pivotally connected to the wall of the primary settling tank through a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod being parallel to each other and having the same length, a stopper being provided on the support block, and the stopper being movably connected to the support block along the vertical direction, and a linkage mechanism being provided between the stopper and the first connecting rod, and the linkage mechanism being configured so that when the first connecting rod is at a first angle, the linkage mechanism can drive the stopper to protrude from the top surface of the support block, and when the first connecting rod is at a second angle, the linkage mechanism can drive the stopper to retract below the top surface of the support block; when the first connecting rod is at the first angle, the top surface of the support block is flush with the top surface of the mounting seat on the first straight portion, and when the first connecting rod is at the second angle, the top surface of the support block is higher than the top surface of the mounting seat on the first straight portion, and one end of the first connecting rod is provided with a torsion spring, and the torsion spring is configured so that its elastic force can drive the first connecting rod to swing from the second angle to the first angle.

6. The primary sedimentation tank scraper mechanism according to claim 5, characterized in that: The linkage mechanism includes a second compression spring and a cam, the second compression spring is installed between the stop block and the support block, and the second compression spring is configured so that its elastic force can drive the stop block to move downward relative to the support block, the cam is installed on the pivot between the first connecting rod and the support block, the cam is fixed to the pivot, and the pivot is fixed to the first connecting rod, the wheel surface of the cam is in contact with the bottom surface of the stop block, and when the first connecting rod swings from the second angle to the first angle, the cam can squeeze the stop block upward so that the stop block protrudes above the top surface of the support block.

7. The primary sedimentation tank scraper mechanism according to claim 1, characterized in that: A first supporting slide rail is provided on the upper portion of the wall of the primary sedimentation tank, and both ends of the scraper on the first straight section are overlapped on the first supporting slide rail.

8. The primary sedimentation tank scraper mechanism according to claim 1, characterized in that: A second supporting slide rail is provided on the bottom of the primary sedimentation tank, and the scraper on the second straight section is overlapped on the second supporting slide rail.

9. The primary sedimentation tank scraper mechanism according to claim 1, characterized in that: The cross-sectional outer contour of the scraper is T-shaped, and the wings of the T are arranged away from the annular conveying chain.

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