Chain skimming machine for rectangular pool

Abstract

The invention relates to the technical field of chain skimming machines, and discloses a chain skimming machine for a rectangular pool, the chain skimming machine comprises a conveying mechanism and a skimming mechanism, the conveying mechanism is arranged on a sedimentation tank, the skimming mechanism is arranged on the conveying mechanism, the skimming mechanism comprises a conveying frame and a skimming plate, the conveying frame comprises a cross beam and a guide rod, and the skimming plate comprises a main plate and an auxiliary plate. The cross beam is horizontally arranged on the conveying mechanism, the guide rods are arranged at the ends of the cross beam respectively and are in sliding fit with the cross beam, and driving units for driving the guide rods to move are further arranged between the guide rods and the cross beam; the main plate is horizontally arranged on the cross beam, the auxiliary plate is arranged on the guide rod, the moving area of the auxiliary plate and the moving area of the main plate partially coincide, and the auxiliary plate is rotationally hinged to the guide rod and rotates around the vertical plane along with fluctuation of the inner wall of the sedimentation tank through the swing unit. When the gap between the skimming plate and the tank wall is too large, the auxiliary plate is close to the tank wall in a self-adaptive manner to make up the gap, so that the effect of cleaning the scum is achieved.

Description

Technical Field

[0001] This application relates to the field of chain skimmer technology, and in particular to a chain skimmer for rectangular water tanks. Background Technology

[0002] Rectangular sedimentation tanks are the most commonly used type of sedimentation tank in wastewater treatment. They are widely used due to their advantages such as regular structure, compact layout, and ease of assembly, and are particularly suitable for large-scale wastewater treatment plants. In this type of tank, water flows from the inlet to the outlet, and with the help of the surface skimming plates, the scum gradually accumulates in the water surface area near the outlet weir, which is located in front of the scum collection trough for easy collection.

[0003] Currently, commonly used chain skimmers mainly consist of two parts: a conveying mechanism and a skimming mechanism. The conveying mechanism mainly comprises a drive axle, a driven axle, and a drive reducer. The drive axle is installed at the beginning of the sedimentation tank's inner wall, while the driven axle is located at the end of the tank; the axes of both axles are perpendicular to the length of the sedimentation tank. The drive reducer is fixedly installed at the top of the sedimentation tank and is connected to the drive axle via a chain.

[0004] The skimming mechanism is fixedly mounted on a chain and moves cyclically with the chain. Its main component is the skimming plate. The chain drives the skimming plate to move along the water surface, thereby pushing the scum into the scum collection tank.

[0005] However, existing skimming plates have a fixed length, and the top of the sedimentation tank sidewall often has lateral unevenness due to construction errors. When the gap between the skimming plate and the tank wall is too large, scum can easily leak out from the gap, affecting the skimming effect and reducing cleaning efficiency. In addition, when the skimming plate moves back with the chain, because the end of the plate is close to the tank wall, the collected scum may rise with the skimming plate and flow back, causing secondary diffusion. Summary of the Invention

[0006] When the gap between the skimming plate and the pool wall is too large, in order for the skimming plate to adapt to move closer to the pool wall to make up for the gap and facilitate the cleaning of floating scum, this application provides a chain skimming machine for rectangular pools.

[0007] The chain skimmer for rectangular water tanks provided in this application adopts the following technical solution: A chain skimmer for a rectangular water tank includes a conveying mechanism and a skimming mechanism. The conveying mechanism is mounted on the sedimentation tank, and the skimming mechanism is mounted on the conveying mechanism. The skimming mechanism includes a conveying frame and a skimming plate. The conveying frame includes a crossbeam and a guide rod, and the skimming plate includes a main plate and a secondary plate. The crossbeam is horizontally mounted on the conveying mechanism. A pair of guide rods are provided, each located at the end of the crossbeam and slidingly engaging with the crossbeam along the width of the sedimentation tank. A drive unit for moving the guide rods is also provided between the guide rods and the crossbeam. The main plate is horizontally mounted on the crossbeam, and the sub-plate is mounted on the guide rod. The sub-plate is located in front of the crossbeam in the direction of movement. The movement area of ​​the sub-plate and the movement area of ​​the main plate partially overlap. The sub-plate is rotatably hinged to the guide rod and rotates around the vertical plane with the undulation of the inner wall of the sedimentation tank via a swing unit.

[0008] Optionally, a fixing block is provided at the middle position of the crossbeam, and the driving unit includes a first connecting rod, a second connecting rod, and a first tension spring, wherein: Both the first link and the second link are provided in pairs. The pair of first links are rotatably hinged to the fixed block, and the pair of second links are rotatably hinged to the end of the guide rod. The first link and the second link are rotatably hinged to form a rhomboid four-bar structure. The first tension spring is located in the middle of the diamond-shaped four-bar linkage, and the pivot joint between the first link and the second link is connected to the end of the adjacent first tension spring.

[0009] Optionally, the crossbeam has a channel running through both ends of the crossbeam along its length. The fixing block is placed in the middle of the channel and divides the channel into two sections. The channel has a roller inside, and the guide rod is placed inside the channel and slides with the channel along the length of the crossbeam through the roller.

[0010] Optionally, the rhomboid four-bar linkage is vertically arranged, and a guide groove is provided on the side wall of the channel along the length of the crossbeam; A lever is slidably provided inside the guide groove along the length direction of the guide groove. The length direction of the lever is consistent with the length direction of the sedimentation tank. The middle position of the lever is connected to the middle position of the first tension spring. A pair of stretching plates are provided at the initial end of the sedimentation tank, and a pair of indentation plates are provided at the end of the sedimentation tank. Each pair of stretching plates is provided with a stretching surface. The stretching surfaces gradually slope downward from the initial end to the end of the sedimentation tank, and gradually slope towards the side wall of the sedimentation tank from the middle of the width direction to the side wall of the sedimentation length direction. The pair of recessed plates are provided with recessed surfaces, and the pair of recessed surfaces gradually slope upward along the direction from the initial end to the end of the sedimentation tank, and the pair of recessed surfaces gradually slope away from the end of the sedimentation tank along the width direction from the middle position to the length direction of the sedimentation tank sidewall. When the end of the lever contacts the tension surface, the pair of guide rods move in phase; When the end of the lever contacts the recessed surface, the pair of guide rods move toward each other.

[0011] Optionally, the swing unit includes a swing frame and a swing wheel, wherein: The swing frame is rotatably engaged with the swing frame via a vertical first rotating shaft; The swing wheels are provided in pairs, and each pair of swing wheels is rotatably engaged with the swing frame through a vertical second rotating shaft. The pair of swing wheels are distributed along the length of the sedimentation tank. The top of the sub-plate is provided with a connecting plate, and the connecting plate is provided with a sliding groove. The connecting plate is rotatably engaged with one of the second rotating shafts. The first rotating shaft is placed inside the sliding groove and is slidably engaged with the sliding groove. The sub-plate is inclined, and the distance between the sub-plate and the main plate gradually increases along the direction from near the crossbeam to far away from the crossbeam.

[0012] Optionally, a flip plate is rotatably hinged to the motherboard via a horizontal third pivot, and an elastic reset element is provided between the motherboard and the flip plate, and the two are in a stable parallel state through the elastic reset element. When the flip plate is in a stable state, the force direction of the elastic reset element passes through the axis of the third rotating shaft to form a dead point; The sedimentation tank includes an initial end and an end opposite each other along its length. The sedimentation tank is equipped with a flap trigger at the end. When the main board moves to the flap trigger, the flap trigger pushes the flapping plate away from the stable state, causing the flapping plate to flip upward to lift the scum into the scum collection tank. The initial end of the sedimentation tank is equipped with a flap reset component. When the main board moves back to the flap reset component, the flap reset component pushes the flap to flip and restore it to a stable state.

[0013] Optionally, the elastic reset element includes a pair of second tension springs, which are respectively disposed at both ends of the flip plate, with one end of the second tension spring disposed at the end of the main board and the other end of the second tension spring disposed at the end of the flip plate; When the flip plate is in a stable state, the axis of the second tension spring and the axis of the third rotating shaft are located on the same vertical plane.

[0014] Optionally, the flip-plate trigger includes a trigger cam installed at the end of the sedimentation tank. When the trigger cam contacts the flip-plate, the trigger cam pushes the flip-plate to flip upward. The flip plate reset component includes a reset cam installed at the initial end of the sedimentation tank. When the reset cam contacts the flip plate, the reset cam pushes the flip plate to restore the flip plate to a stable state.

[0015] Optionally, the motherboard is provided with a pair of limiting plates, the included angle between the pair of limiting plates is set at a predetermined angle, and the flip plate is located between the pair of limiting plates to limit the rotation range of the flip plate.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. The auxiliary plate can move laterally and rotate around the vertical axis of the first pivot via a drive unit and a swing unit, thus ensuring a tight fit with the contour of the sedimentation tank sidewall. During operation, the diamond-shaped four-bar linkage driven by the first tension spring allows the guide rod to automatically adjust according to the concavity and convexity of the tank wall: when the tank wall is convex, it pushes the guide rod inward; when it is concave, the tension spring releases its elasticity to push the guide rod outward, effectively eliminating gaps. At the same time, under the action of the swing unit, the auxiliary plate changes its angle with the direction of travel according to the undulation of the tank wall, ensuring continuous contact at the leading edge, preventing scum from escaping through gaps, significantly improving the scum collection rate, and thus improving the effluent quality. 2. Through the channels within the crossbeam, roller supports, and the cooperation of the lever and the inclined surface, the skimming plate can automatically adjust its width at the initial and final ends of the sedimentation tank. At the initial end, the lever rolls along the bidirectional inclined surface of the tension plate, pulling the first tension spring to unfold the diamond mechanism, driving the guide rods to move in opposite directions, and the skimming plate extends to its working width. At the final end, the lever rolls along the inclined surface of the retraction plate, forcing the diamond mechanism to contract, the guide rods to move in opposite directions, and the skimming plate smoothly narrows. Utilizing the automatic adjustment mechanism based on geometric constraints, the dead-point resistance of the mechanism is overcome, ensuring the flexibility and stability of the skimming plate during operation, reducing manual intervention, and adapting to different tank width requirements. 3. The tilting plate, through its elastic reset element and limit plate design, achieves automatic switching between stable states. During slag discharge, the trigger cam pushes the tilting plate, causing it to deviate from its dead point. The elastic force of the second tension spring is instantly converted into driving torque, forcing the tilting plate to quickly tilt upwards, thoroughly lifting the slag into the collection trough. During the return stroke, the reset cam guides the tilting plate in the opposite direction to the dead point, restoring the parallel locked state. The entire process is controlled by a motor-driven cam rotation, achieving flexible contour guidance and significantly reducing impact, noise, and component wear. Simultaneously, the adjustment holes on the adjustment frame allow adjustment of the initial elastic force of the second tension spring according to operating conditions, optimizing the tilting action and extending the equipment's service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0018] Figure 2This is a schematic diagram illustrating the relative positions of the stretching plate and the indentation plate in Embodiment 1 of this application.

[0019] Figure 3 This is a schematic diagram illustrating the relative positions of the lever and the actuation wheel in Embodiment 1 of this application.

[0020] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0021] Figure 5 This is a schematic diagram illustrating that the lever is in a dead position inside the guide groove in Embodiment 1 of this application.

[0022] Figure 6 This refers to the relative positions of the lever and the guide groove in Embodiment 1 of this application, where the guide rod is in its retracted state after passing the retracting plate.

[0023] Figure 7 This refers to the relative positions of the lever and the guide groove in the extended state of the guide rod after passing the extension plate, as shown in Embodiment 1 of this application.

[0024] Figure 8 yes Figure 5 Enlarged schematic diagram of part B.

[0025] Figure 9 The schematic diagram in Embodiment 2 of this application illustrates the flip-board trigger and the relative position of the flip-board trigger.

[0026] Figure 10 The schematic diagram in Embodiment 2 of this application illustrates the relative positions of the motherboard and the flip panel.

[0027] Figure 11 yes Figure 10 An enlarged schematic diagram of section C.

[0028] Figure 12 This is a schematic diagram illustrating the flip-board trigger and its structure in Embodiment 2 of this application.

[0029] Explanation of reference numerals in the attached figures: 1. Conveying mechanism; 11. Driven wheel axle; 12. Driven wheel axle; 13. Drive reducer; 2. Skimming mechanism; 21. Conveying frame; 211. Crossbeam; 2111. Fixing block; 2112. Channel; 2113. Roller; 2114. Guide groove; 212. Guide rod; 213. Drive unit; 2131. First connecting rod; 2132. Second connecting rod; 2133. First tension spring; 214. Paddle lever; 2141. Paddle wheel; 22. Skimming plate; 221. Main plate; 222. Secondary plate; 223. Connecting plate; 224. Slide; 23. Swing unit; 231. Swing frame; 232. Swing wheel; 233. First rotating shaft; 234. Second rotating shaft; 3. Sedimentation tank; 31. Stretching plate; 32. Retracting plate; 33. Slag collection trough; 4. Tilting plate; 41. Adjusting frame; 42. Adjusting hole; 43. Adjusting bolt; 44. Shim; 45. Adjusting cylinder; 5. Elastic reset element; 51. Second tension spring; 6. Tilting plate trigger; 61. Trigger cam; 62. Drive shaft; 7. Tilting plate reset element; 71. Reset cam; 8. Limiting plate. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-12 This application will be described in further detail.

[0031] This application discloses a chain skimmer for rectangular water tanks.

[0032] Example 1 A chain skimmer for a rectangular water tank includes a conveying mechanism 1 and a skimming mechanism 2. The conveying mechanism 1 is mounted on a sedimentation tank 3, and the skimming mechanism 2 is mounted on the conveying mechanism 1. The skimming mechanism 2 mainly consists of a conveying frame 21 and skimming plates 22. The conveying frame 21 includes a crossbeam 211 and a pair of guide rods 212. The crossbeam 211 is horizontally mounted on the conveying mechanism 1, and the pair of guide rods 212 are respectively located at both ends of the crossbeam 211 and can slide relative to the crossbeam 211 along the width direction of the sedimentation tank 3. A drive unit 213 is provided between the crossbeam 211 and each guide rod 212 to drive their movement.

[0033] The conveying mechanism 1 mainly consists of a drive shaft 11, a driven shaft 12, and a drive reducer 13. The drive shaft 11 is installed at the starting end of the inner wall of the sedimentation tank 3, while the driven shaft 12 is located at the end of the tank. The axes of both shafts are perpendicular to the length of the sedimentation tank 3. The drive reducer 13 is fixedly installed at the top of the sedimentation tank 3 and is connected to the drive shaft 11 for transmission. The drive shaft 11 and the driven shaft 12 are driven by a chain. The skimming mechanism 2 is fixedly installed on the chain and moves cyclically with the chain.

[0034] The skimming plate 22 consists of a main plate 221 and a secondary plate 222. The main plate 221 is horizontally fixed to the crossbeam 211, while the secondary plate 222 is mounted on the guide rod 212 and located in front of the crossbeam 211 in the direction of movement. The moving area of ​​the secondary plate 222 partially overlaps with the moving area of ​​the main plate 221. The secondary plate 222 and the guide rod 212 are pivotally hinged and equipped with a swing unit 23, which allows the swing unit 23 to automatically rotate in the horizontal plane according to the contour undulation of the sidewall of the sedimentation tank 3 along its length, thereby ensuring that the leading edge of the swing unit 23 always remains in contact with the tank wall.

[0035] The auxiliary plate 222 can move laterally under the control of the drive unit 213 to adjust the total length of the skimming plate 22; at the same time, through the hinge and swing unit 23, the auxiliary plate 222 can rotate around the vertical axis, so as to flexibly conform to the undulating pool wall contour in the direction of water flow.

[0036] During operation, the drive unit 213 pushes the guide rod 212 and the sub-plate 222 to slide along the crossbeam 211, causing the sub-plate 222 to extend outward, ensuring that the total length of the main plate 221 and the sub-plate 222 combined can effectively cover the pool wall area and eliminate excessive gaps.

[0037] Driven by the chain, the entire skimming mechanism 2 moves forward. Under the action of the swing unit 23, the leading edge of the front auxiliary plate 222 will closely adhere to the horizontally undulating pool wall. When the pool wall contour causes the gap to change, the auxiliary plate 222 rotates in the horizontal plane, changing its angle with the direction of travel, and always maintaining contact with the pool wall, pushing the scum towards the scum collection tank 33.

[0038] A fixing block 2111 is provided at the middle position of the crossbeam 211. The drive unit 213 includes a first link 2131, a second link 2132, and a first tension spring 2133. There are pairs of first links 2131 and second links 2132. A pair of first links 2131 are rotatably hinged to the fixing block 2111, while a pair of second links 2132 are rotatably hinged to the ends of the guide rod 212. Each first link 2131 and its corresponding second link 2132 are connected by a rotatable hinge, thus forming a rhomboid four-bar linkage. The first tension spring 2133 is located in the central area of ​​this rhomboid four-bar linkage, with its two ends connected to the rotatable hinges of the first link 2131 and the second link 2132, respectively.

[0039] Utilizing the variable characteristics of the rhomboid four-bar linkage, when a force is applied to the vertex in a direction parallel to the crossbeam 211, the rhomboid four-bar linkage will contract or expand in a direction perpendicular to the crossbeam 211.

[0040] During operation, the unevenness of the sidewall of sedimentation tank 3 directly applies force, pushing the guide rod 212 to move laterally. Simultaneously, the continuous elastic force applied by the first tension spring 2133 drives the guide rod 212 and its auxiliary plate 222 structure to maintain close contact with the sidewall of sedimentation tank 3. When a bulge appears in the tank wall in front of the auxiliary plate 222, the tank wall pushes the guide rod 212 inward to compress the rhomboid mechanism. When a depression appears in the tank wall, the pre-tensioned tension spring immediately releases its elastic force, pushing the rhomboid mechanism to unfold, thereby driving the guide rod 212 outward to fill the gaps. This ensures continuous close contact, preventing scum escape due to gaps, significantly improving the scum collection rate, and enhancing the effluent quality.

[0041] An internal channel running through both ends is provided inside the crossbeam 211 along its length. A fixing block 2111 is placed in the middle of this channel, thus dividing the entire channel into two independent channels 2112. A roller 2113 is provided inside each channel 2112. A guide rod 212 extends into and is placed inside the channel 2112, and through the contact of the roller 2113 with the channel wall, it achieves a low-resistance sliding fit along the length of the crossbeam 211.

[0042] The undulations of the pool wall push the guide rod 212. When the first tension spring 2133 drives the guide rod 212 back to its original position, the guide rod 212 performs lateral extension and retraction within the channel 2112. The channel wall constrains its movement trajectory, ensuring that the guide rods 212 on both sides always move in a straight line. During this process, the guide rod 212 contacts the channel through rollers 2113. The rollers 2113 rotate as the guide rod 212 moves, overcoming static and dynamic friction with the channel wall through rolling, making the movement lighter and more sensitive.

[0043] The rhomboid four-bar linkage is vertically arranged, wherein the length directions of the first link 2131 and the second link 2132 are not aligned, together forming two adjacent sides of the rhombus. A guide groove 2114 is formed on the side wall of the channel 2112 along the length direction of the crossbeam 211. A lever 214 is slidably mounted within the guide groove 2114, its length direction being consistent with the length direction of the sedimentation tank 3. The middle position of the lever 214 is connected to the middle position of the first tension spring 2133. An actuating wheel 2141 is provided at the end of the lever 214.

[0044] A pair of tension plates 31 are installed at the initial end of the sedimentation tank 3, and a pair of indentation plates 32 are installed at the end of the sedimentation tank 3. The tension plates 31 are provided with tension surfaces, which are inclined in two directions: firstly, from the initial end of the sedimentation tank 3 to the end end, they gradually incline downwards; secondly, from the middle position of the width direction of the sedimentation tank 3 towards the side wall, they gradually incline towards the initial end of the sedimentation tank 3.

[0045] The recessed plate 32 is provided with a recessed surface, which is also inclined in two directions. First, it gradually slopes upward from the initial end to the end of the sedimentation tank 3. Second, it gradually slopes away from the end of the sedimentation tank 3 from the middle position of the width direction of the sedimentation tank 3 towards the side wall.

[0046] When the actuating wheel 2141 contacts the stretching surface and rolls, it pushes a pair of guide rods 212 to move in opposite directions, causing the skimming plate 22 to extend and become longer. When the actuating wheel 2141 contacts the retracting surface and rolls, it pushes a pair of guide rods 212 to move in opposite directions, causing the skimming plate 22 to retract and become narrower.

[0047] When the skimming mechanism 2 reaches the initial end of the sedimentation tank 3, the actuating wheel 2141 at the end of the lever 214 contacts the inclined surface of the tension plate 31. Driven by the forward movement of the crossbeam 211, the actuating wheel 2141 rolls downward and laterally along the inclined surface. This movement forces the middle part of the first tension spring 2133 through the lever 214, causing the diamond four-bar linkage to unfold laterally, driving a pair of guide rods 212 to move in opposite directions, so that the skimming plate 22 extends to the preset working width.

[0048] When the skimming mechanism 2 reaches the end of the sedimentation tank 3, the actuating wheel 2141 contacts the inclined surface of the retracting plate 32. Under the guidance of the inclined surface of the retracting plate 32, the actuating wheel 2141 rolls upward and inward, forcing the diamond four-bar linkage to retract laterally, the guide rods 212 move towards each other, and the skimming plate 22 retracts smoothly.

[0049] By utilizing the geometric constraints of a fixed inclined plane, a definite motion path and the necessary energy are provided for the rhombic four-bar linkage to overcome the dead-point resistance inside the rhombic four-bar linkage.

[0050] The swing unit 23 consists of a swing frame 231 and a pair of swing wheels 232. The swing frame 231 is rotated with the guide rod 212 via a vertical first rotating shaft 233. The pair of swing wheels 232 are rotated with the swing frame 231 via two vertical second rotating shafts 234 respectively. These two swing wheels 232 are distributed along the length of the sedimentation tank 3, i.e., the forward direction.

[0051] A connecting plate 223 is horizontally mounted on the top of the sub-plate 222. The connecting plate 223 is rotatably engaged with the second rotating shaft 234 located on the front side. The bottom end of the first rotating shaft 233 extends into the sliding groove 224 opened on the connecting plate 223, forming a sliding engagement with the sliding groove 224.

[0052] In addition, the sub-plate 222 is set at an angle, and the distance between it and the main plate 221 gradually increases along the direction from the side closer to the crossbeam 211 to the side farther away from the crossbeam 211, i.e., closer to the pool wall.

[0053] The floating linkage mechanism converts the thrust of the pool wall undulations on the swing wheel 232 into the rotation of the sub-plate 222 around the front second rotating shaft 234. The sliding engagement between the first rotating shaft 233 and the slide groove 224 converts the rotation of the swing frame 231 around the first rotating shaft 233 into a variable lever arm, thereby driving the connecting plate 223 and the sub-plate 222 to adjust their angles.

[0054] When the pool wall at the leading edge of the sub-plate 222 becomes uneven, the undulations exert a lateral force on the swing wheel 232, pushing the swing frame 231 to rotate around the first rotating shaft 233. The rotation of the swing frame 231 causes the first rotating shaft 233 to slide within the groove 224 of the connecting plate 223, simultaneously applying a pushing or pulling force. Since the connecting plate 223 and the front second rotating shaft 234 are in a fixed rotational fit, this force creates a torque that compels the entire connecting plate 223, along with the sub-plate 222, to rotate around the front rotating shaft. Under the action of this torque, the sub-plate 222 rotates horizontally around the front hinge point, changing its leading edge angle and thus tightly conforming to the contour of the pool wall.

[0055] The implementation principle of a chain skimmer for a rectangular water tank according to an embodiment of this application is as follows: When the chain skimmer is running, the drive reducer 13 drives the chain between the drive wheel shaft 11 and the driven wheel shaft 12 to rotate cyclically, and the skimmer mechanism 2 fixed on the chain moves along the length of the sedimentation tank 3. At the initial end, the lever 214 drives the wheel 2141 to roll downward and sideways along the bidirectional inclined tension surface of the tension plate 31. The lever 214 pulls the middle of the first tension spring 2133 to make the vertical rhomboid four-bar linkage unfold laterally, driving a pair of guide rods 212 to slide in opposite directions in a straight line under the support of the rollers 2113 in the left and right channels 2112 of the crossbeam 211. The auxiliary plate 222 extends outward to the preset working width, so that the total length of the main plate 221 and the auxiliary plate 222 covers the tank wall area.

[0056] During movement, the first tension spring 2133 continuously applies elastic force to keep the rhomboid mechanism outward, forcing the swing wheel 232 at the front end of the guide rod 212 to press tightly against the pool wall. When a bulge appears on the side wall, the pool wall pushes the guide rod 212 inward to compress the rhomboid mechanism and further tensions the first tension spring 2133. When a depression appears, the first tension spring 2133 releases elastic force to push the rhomboid mechanism to unfold, and the guide rod 212 extends outward to fill the gap. At the same time, the lateral force of the undulation of the pool wall on the swing wheel 232 causes the swing frame 231 to rotate around the first rotating shaft 233. The first rotating shaft 233 slides in the groove 224 of the connecting plate 223 to form a variable lever arm, driving the connecting plate 223 and the inclined sub-plate 222 to rotate around the front second rotating shaft 234 in the horizontal plane, changing the angle between the front edge of the sub-plate 222 and the direction of travel, and always closely fitting the contour of the lateral undulation of the pool wall.

[0057] When it reaches the end, the actuating wheel 2141 rolls upward and inward along the bidirectional inclined retraction surface of the retraction plate 32, forcing the rhomboid mechanism to retract laterally, the guide rods 212 move towards each other, and the scum skimming plate 22 narrows smoothly. Throughout the process, the auxiliary plate 222 and the main plate 221 partially overlap and the distance between them gradually increases from the crossbeam 211 towards the pool wall, continuously pushing the scum towards the scum collection trough 33, achieving a high collection rate and improved effluent quality.

[0058] Example 2 The difference between this embodiment and Embodiment 1 is that a flip plate 4 is rotatably hinged to the main board 221 via a horizontal third pivot. An elastic reset element 5 is provided between the main board 221 and the flip plate 4.

[0059] When the flip plate 4 is in a stable state, the line of action of the elastic reset element 5 just passes through the axis of the third rotating shaft, so that the system is in balance and cannot generate a torque to drive the flip.

[0060] To achieve automatic slag unloading, a flap trigger 6 is installed at the end of the sedimentation tank 3. When the main board 221 moves to this position, the flap trigger 6 pushes the flapping plate 4, causing it to deviate from its stable state. Once it crosses the dead point, the elastic force line of the elastic reset element 5 immediately shifts to one side of the rotating shaft, and its accumulated elastic potential energy is released instantaneously, converting into driving torque, forcing the flapping plate 4 to quickly flip upward, thereby completely flipping the accumulated slag into the slag collection tank 33.

[0061] To prepare for the next work cycle, a flap reset component 7 is provided at the initial end of the sedimentation tank 3. When the main board 221 passes the flap reset component 7 during its return movement, the flap reset component 7 pushes the already flipped flap 4, helping it to move in the opposite direction and reach the dead point again. Once this critical position is reached, the force of the elastic reset element 5 passes through the axis of rotation again, and the system automatically locks, thus restoring the flap 4 to a stable state parallel to the main board 221.

[0062] The running state and the flipping state are two stable states. The flip trigger 6 provides energy to push the mechanism past the dead point, switching from the parallel stable state to the flipping stable state. The flip reset 7 provides energy to push the mechanism in the opposite direction to the dead point. Once reached, the mechanical properties of the elastic reset element 5 will naturally guide the mechanism back to the parallel stable state and achieve self-locking.

[0063] The elastic reset element 5 specifically includes a pair of second tension springs 51. These two second tension springs 51 are respectively disposed at the left and right ends of the flip plate 4. One end of each second tension spring 51 is connected to the end of the main board 221, and the other end is connected to the corresponding end of the flip plate 4.

[0064] When the flip plate 4 is in a stable state parallel to the main plate 221, the axis of the second tension spring 51 and the axis of the third rotating shaft are located on the same vertical plane.

[0065] A pair of second tension springs 51 apply tension to the flip plate 4, with its line of action passing through the rotation axis of the third rotating shaft. This prevents the tension generated by the springs from forming any driving torque around the rotating shaft, thus stably locking the flip plate 4 in a parallel position.

[0066] In the non-slag-discharging state, no matter how much tension the second tension spring 51 has, since its force line passes through the axis of the third rotating shaft, the torque on the third rotating shaft is zero. The tilting plate 4 can stably remain parallel to the main plate 221 and reliably perform slag skimming operations.

[0067] When the flip-plate trigger 6 pushes the flip-plate 4 slightly off-parallel, the axis of the second tension spring 51 also shifts, no longer passing through the third pivot. At this moment, the tension of the spring immediately generates a lever arm around the pivot, thus forming a strong driving torque that drives the flip-plate 4 to accelerate upward flipping.

[0068] An adjustment bracket 41 is provided at the end of both the main board 221 and the end of the flip plate 4. A series of adjustment holes 42 are formed on the adjustment bracket 41 along the vertical direction. An adjustment bolt 43 is screwed into the selected adjustment hole 42 for threaded connection, and a washer 44 is fitted onto the bolt. The end ring of the second tension spring 51 is fitted onto the adjustment bolt 43 and axially limited by the washer 44, thus completing the connection.

[0069] To reduce the possibility of interference between the main board 221 and the sub-board 222 on the operation of the second tension spring 51, an adjusting cylinder 45 is fitted on the adjusting bolt 43. The adjusting cylinder 45 and the washer 44 work together to clamp the second tension spring 51, and the distance between the second tension spring 51, the main board 221 and the sub-board 222 is adjusted by the adjusting cylinder 45.

[0070] By installing the adjusting bolts 43 through the adjusting holes 42 at different heights on the main board 221 end and the adjusting bracket 41 at the flip plate 4 end, the hooking positions at both ends of the second tension spring 51 can be changed, thereby adjusting the initial tension and initial elasticity of the second tension spring 51, and thus adjusting the initial thrust required to trigger the flip and the speed of the flipping action.

[0071] Maintenance personnel select different height holes on the adjusting frame 41 to install the adjusting bolts 43 according to the actual working conditions, such as the viscosity and weight of the scum.

[0072] The flip-plate trigger 6 is a trigger cam 61 fixedly installed at the end of the sedimentation tank 3. When the main board 221 moves to the end of the tank, the flip plate 4 contacts the contour of the trigger cam 61. Under the continuous forward motion drive, the trigger cam 61 pushes the flip plate 4, thereby forcing the flip plate 4 to flip upward.

[0073] The flip plate reset component 7 is a reset cam 71 installed at the initial end of the sedimentation tank 3. When the main board 221 passes the initial end of the tank during its return movement, the flip plate 4 contacts the contour of the reset cam 71. The reset cam 71 pushes the flip plate 4, thereby guiding the flip plate 4 to return to a stable state parallel to the main board 221. The reset cam 71 and the trigger cam 61 are each connected to a motor.

[0074] In the embodiment of the application, the trigger cam 61 and the reset cam 71 are respectively fixedly mounted on a drive shaft 62. The length direction of the drive shaft 62 is perpendicular to the wall of the sedimentation tank 3 and rotates in cooperation with the wall of the sedimentation tank 3. The trigger cam 61 and the reset cam 71 rotate with the corresponding drive shaft 62, thereby pushing the tilting plate 4 to tilt. In order to save costs, the drive shaft 62 on which the reset cam 71 is mounted is connected to the drive reducer 13.

[0075] When the skimming plate 22 is about to reach the slag discharge position, the control system commands the motor of the trigger cam 61 to start, causing the trigger cam 61 to rotate to a preset working angle. When the tilting plate 4 arrives and contacts the contour of the rotating trigger cam 61, it is smoothly guided and lifted up, completing the tilting action. After the slag discharge is completed, the trigger cam 61 can be rotated away from the working position to avoid interference.

[0076] During the return journey, the control system commands the motor of the reset cam 71 to start, causing it to rotate to the working angle. When the flip plate 4 returns and contacts the contour of the reset cam 71, it is guided to move in the opposite direction until it reaches the dead point, and then returns to the parallel locking state under the action of the second tension spring 51.

[0077] The contact between the controlled-rotation trigger cam 61, the reset cam 71 and the flip plate 4 is a gradual, contour-guided, flexible process that can significantly reduce impact, noise and component wear, and extend the service life of the equipment.

[0078] A pair of limiting plates 8 arranged at a predetermined angle are provided on the main board 221. The flip plate 4 is located between these two limiting plates 8. Its forward and reverse rotation ranges are mechanically blocked by the two limiting plates 8, thus limiting it to a predetermined angle range.

[0079] When the flip plate 4 is in the dead position, that is, in a stable state parallel to the main board 221, the flip plate 4 is in contact with one of the limit plates 8, thereby achieving precise positioning.

[0080] When the tilting plate 4 tilts upward during the slag discharge process, it rotates until it contacts the upper limiting plate 8. The limiting plate 8 prevents it from tilting further through mechanical blocking, thereby precisely controlling the maximum slag discharge angle at the predetermined value most favorable to the slag collection tank 33.

[0081] As the flip plate 4 rotates downwards during the reset process, its body rotates until it contacts the lower limit plate 8. This limit plate 8 ensures that the flip plate 4 can accurately stop in a stable state parallel to the main board 221, preparing for the next skimming operation.

[0082] During the reset process, when the flip plate reset component 7 pushes the flip plate 4 back, the flip plate 4 will eventually return to the dead point position and contact the limit plate 8, so as to ensure that the flip plate 4 returns to the same initial position accurately every time, effectively preventing the flip plate 4 from accidentally crossing the dead point and entering another state due to excessive flipping caused by inertia or excessive reset force.

[0083] The implementation principle of Example 2 is as follows: the end of the main board 221 and the end of the flip plate 4 are connected by a pair of second tension springs 51. The flip plate 4 is rotatably hinged to the main board 221 through a horizontal third rotating shaft. When the flip plate 4 is parallel to the main board 221, the line of action of the tension of the second tension spring 51 just passes through the axis of the third rotating shaft, and the system is in a balanced state and self-locking.

[0084] During the skimming operation, the tilting plate 4 remains parallel and moves to the end of the sedimentation tank 3. The control system starts the trigger cam 61 motor, and the trigger cam 61 rotates to the working angle. The tilting plate 4 is gradually lifted along its contour. The tilting plate 4 deviates from the dead point, and the line of action of the second tension spring 51 shifts instantaneously. The accumulated elastic potential energy is released as driving torque, and the tilting plate 4 quickly flips upward until it contacts the upper limit plate 8. The scum is accurately lifted into the scum collection tank 33. After the scum is unloaded, the trigger cam 61 rotates away.

[0085] Returning to the initial end, the reset cam 71 motor is started under control. The reset cam 71 rotates to the working angle, and the flip plate 4 is gently pressed down along its contour, guiding the flip plate 4 to reverse past the dead point. The tension of the second tension spring 51 is realigned with the axis of the third rotating shaft. Under the spring self-locking and the blocking of the lower limit plate 8, the flip plate 4 returns to a stable state parallel to the main board 221, waiting for the next skimming cycle.

[0086] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A chain skimmer for a rectangular basin, comprising a conveying mechanism and a skimming mechanism, the conveying mechanism being provided on a sedimentation tank, the skimming mechanism being provided on the conveying mechanism, characterized in that: The skimming mechanism comprises a conveying frame and a skimming plate, the conveying frame comprises a crossbeam and a guide rod, and the skimming plate comprises a main plate and a sub-plate, wherein: The crossbeam is horizontally arranged on the conveying mechanism, the guide rod is arranged in pairs, and the guide rod is arranged at the end position of the crossbeam and is in sliding fit with the crossbeam along the width direction of the sedimentation tank. The main plate is horizontally arranged on the crossbeam, the sub-plate is arranged on the guide rod, the sub-plate is located in front of the moving direction of the crossbeam, the moving area of the sub-plate and the moving area of the main plate partially overlap, the sub-plate is rotationally connected with the guide rod, and the sub-plate rotates around the vertical plane with the inner wall of the sedimentation tank through a swing unit.

2. The chain skimming machine for a rectangular pool according to claim 1, wherein: The middle position of the crossbeam is provided with a fixed block, and the driving unit comprises a first connecting rod, a second connecting rod and a first tension spring. The first connecting rod and the second connecting rod are both arranged in pairs, one pair of the first connecting rod is rotationally connected on the fixed block, and one pair of the second connecting rod is rotationally connected at the end of the guide rod. The first connecting rod and the second connecting rod are rotationally connected to form a rhombus four-link mechanism. The first tension spring is located in the middle of the rhombus four-link mechanism, and the rotationally connected positions of the first connecting rod and the second connecting rod are connected with the end of the adjacent first tension spring.

3. The chain skimming machine for a rectangular pool according to claim 2, wherein: The inside of the crossbeam is provided with a channel penetrating through both ends of the crossbeam along the length direction of the crossbeam, the fixed block is arranged at the middle position of the channel and divides the channel into two sections, the inside of the channel is provided with a roller, and the guide rod is arranged in the inside of the channel and is in sliding fit with the channel along the length direction of the crossbeam through the roller.

4. The chain skimming machine for a rectangular pool according to claim 3, wherein: The rhombus four-link mechanism is vertically arranged, and a guide groove is arranged on the side wall of the channel along the length direction of the crossbeam. A push rod is arranged in the guide groove along the length direction of the guide groove, the length direction of the push rod is consistent with the length direction of the sedimentation tank, and the middle position of the push rod is connected with the middle position of the first tension spring. A pair of stretching plates are arranged at the initial end position of the sedimentation tank, a pair of retracting plates are arranged at the end position of the sedimentation tank, a stretching surface is arranged on each of the stretching plates, the stretching surfaces gradually incline downward along the direction from the initial end of the sedimentation tank to the end of the sedimentation tank, and the stretching surfaces gradually incline toward the initial end width direction side wall of the sedimentation tank along the middle position of the width direction to the length direction side wall of the sedimentation tank. A retracting surface is arranged on each of the retracting plates, the retracting surfaces gradually incline upward along the direction from the initial end of the sedimentation tank to the end of the sedimentation tank, and the retracting surfaces gradually incline away from the end width direction of the sedimentation tank along the middle position of the width direction to the length direction side wall of the sedimentation tank. When the end of the push rod is in contact with the stretching surface, the guide rods move away from each other. When the end of the lever is in contact with the recessed surface, a pair of guide rods move towards each other.

5. The chain skimmer for rectangular pool according to claim 1, characterized in that: The swing unit comprises a swing frame and a swing wheel, wherein: The swing frame is rotationally connected with the guide rod through a vertical first rotating shaft; The swing wheel is provided with a pair of swing wheels, which are rotationally connected with the swing frame through a vertical second rotating shaft and are distributed along the length direction of the sedimentation tank; The top of the auxiliary plate is horizontally provided with a connecting plate, the connecting plate is provided with a sliding groove, the connecting plate is rotationally connected with one of the second rotating shafts, the first rotating shaft is arranged in the sliding groove and is slidingly connected with the sliding groove, the auxiliary plate is arranged obliquely, and the distance between the auxiliary plate and the main plate gradually increases from the direction close to the cross beam to the direction away from the cross beam.

6. The chain skimmer for rectangular pool according to claim 1, characterized in that: The main plate is rotationally connected with a turnover plate through a horizontal third rotating shaft, the main plate and the turnover plate are provided with an elastic reset element, and are in a stable state of being parallel to each other through the elastic reset element; When the turnover plate is in the stable state, the force direction of the elastic reset element passes through the axis of the third rotating shaft to form a dead point; The sedimentation tank comprises an initial end and a tail end opposite to each other along the length direction; The tail end of the sedimentation tank is provided with a turnover plate trigger, when the main plate moves to the turnover plate trigger, the turnover plate trigger pushes the turnover plate to deviate from the stable state, so that the turnover plate is turned up to lift the scum into the skimming groove; The initial end of the sedimentation tank is provided with a turnover plate reset element, when the main plate moves back to the turnover plate reset element, the turnover plate reset element pushes the turnover plate to turn over to the stable state.

7. The chain skimmer for rectangular pool according to claim 6, characterized in that: The elastic reset element comprises a pair of second tension springs, the second tension springs are arranged at the two ends of the turnover plate respectively, one end of the second tension spring is arranged at the end of the main plate, and the other end of the second tension spring is arranged at the end of the turnover plate; When the turnover plate is in the stable state, the axis of the second tension spring and the axis of the third rotating shaft are located in the same vertical plane.

8. The chain skimmer for rectangular pool according to claim 7, characterized in that: The turnover plate trigger comprises a trigger cam installed at the tail end of the sedimentation tank, when the trigger cam is in contact with the turnover plate, the trigger cam pushes the turnover plate to turn up; The turnover plate reset element comprises a reset cam installed at the initial end of the sedimentation tank, when the reset cam is in contact with the turnover plate, the reset cam pushes the turnover plate to return to the stable state.

9. The chain skimmer for rectangular pool according to claim 8, characterized in that: The main plate is provided with a pair of limiting plates, the included angle between the limiting plates is set to a predetermined angle, and the turnover plate is located between the limiting plates to limit the rotation range of the turnover plate.

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