A height-adjustable sewage treatment aeration device

Abstract

This invention discloses an adjustable sewage treatment aeration device, belonging to the field of sewage treatment technology. It includes a lifting mechanism and an adjusting mechanism. The lifting mechanism is located above the adjusting mechanism, and connecting plates are fixedly installed on the top of both sides of the adjusting mechanism. The lifting mechanism is fixedly connected to the top of the connecting plates. An aeration mechanism is movably installed at the bottom of the adjusting mechanism. An angle adjusting mechanism for adjusting the angle of the aeration mechanism is movably installed at both the front and rear of the lifting mechanism. A screw slider is threaded onto the external part of the drive screw, and connecting rods are fixedly connected to both sides of the screw slider. The far ends of the two connecting rods are fixedly connected to corresponding guide rods through fixing rings. This invention can adjust the height, spacing, and tilt angle of the aeration mechanism, making it suitable for aeration applications in different situations.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically an adjustable wastewater treatment aeration device. Background Technology

[0002] In wastewater treatment processes, aeration devices are one of the core pieces of equipment. Their main function is to introduce air into the water, achieving thorough gas-liquid mixing, increasing the dissolved oxygen content of the water, promoting the degradation of pollutants in the water, and ensuring the effectiveness of wastewater treatment. Currently, there are many types of wastewater treatment aeration devices on the market, including submersible aerators and surface aerators. Among them, submersible aerators are widely used in various wastewater treatment ponds, oxidation ponds, and other scenarios due to their high aeration efficiency and flexible installation.

[0003] However, existing submersible aeration devices still have many shortcomings in practical applications. First, the installation height of existing aeration devices is mostly fixed, lacking an effective lifting and adjustment mechanism. This makes it impossible to flexibly adjust the immersion depth of the aerators according to the water depth, water level changes, and different treatment process requirements. Second, in scenarios where multiple aeration devices are used together, most existing devices cannot achieve synchronous and equidistant adjustment of adjacent aeration units. They mostly adopt an independent adjustment method for each unit, which is cumbersome to operate, has low adjustment efficiency, and makes it difficult to ensure uniform spacing between aeration devices. Finally, the aeration angle of existing aeration devices is mostly fixed, lacking a reliable synchronous angle adjustment mechanism. This makes it impossible to flexibly adjust the aeration jet direction according to the pool layout and flow field requirements. When multiple aeration devices are used together, it is difficult to achieve synchronous horizontal deflection, which can easily lead to chaotic jet directions of each aeration device, forming water flow collisions and stagnant water zones, further limiting the applicability of the device. Summary of the Invention

[0004] This invention provides a height-adjustable aeration device for sewage treatment, which can solve the technical problem that the height, spacing, and angle of sewage treatment aeration devices in the prior art cannot be adjusted.

[0005] A height-adjustable sewage treatment aeration device includes a lifting mechanism and an adjusting mechanism. The lifting mechanism is located above the adjusting mechanism, and connecting plates are fixedly installed on the top of both sides of the adjusting mechanism. The lifting mechanism is fixedly connected to the top of the connecting plates. An aeration mechanism is movably installed at the bottom of the adjusting mechanism, and angle adjusting mechanisms for adjusting the angle of the aeration mechanism are movably installed at both the front and rear of the lifting mechanism.

[0006] As a further technical solution of the present invention, the lifting mechanism includes a bearing plate, a drive screw is rotatably mounted on the top center of the bearing plate, and two guide sleeves are embedded in the bearing plate. The two guide sleeves are located on both sides of the drive screw. A guide rod is slidably mounted inside the guide sleeve. A screw slider is threadedly connected to the outside of the drive screw, and connecting rods are fixedly connected to both sides of the screw slider. The far ends of the two connecting rods are fixedly connected to the corresponding guide rods through fixing rings.

[0007] As a further technical solution of the present invention, the connecting plate is arranged in an inverted L-shape, and a flange is fixedly installed at the bottom end of the guide rod, and the flange is fixedly connected to the top surface of the connecting plate.

[0008] As a further technical solution of the present invention, the adjusting mechanism includes a fixed frame, a bidirectional lead screw is rotatably installed in the middle of the fixed frame, and three fixed blocks are equidistantly arranged on the outside of the bidirectional lead screw. A through groove is opened in the fixed block located in the middle, the bidirectional lead screw passes through the through groove and does not contact the through groove, the fixed blocks on both sides are threadedly connected to the bidirectional lead screw through a nut slider, vertical plates are fixedly installed on both sides of the bottom of the fixed blocks, and one end of the bidirectional lead screw passes through the fixed frame and is fixedly connected to a connecting seat. A corrugated sleeve is provided on the outside of the threaded end of the bidirectional lead screw.

[0009] As a further technical solution of the present invention, both ends of the corrugated sleeve are fixedly connected with sealing rings, one of which is fixedly connected to a bidirectional lead screw, and the other sealing ring is fixedly connected to the side wall of the corresponding fixing block.

[0010] As a further technical solution of the present invention, the middle part of the bidirectional lead screw is a smooth section, and the two sides of the smooth section are threaded sections with opposite thread directions. The fixing blocks on both sides are respectively connected to the two threaded sections with opposite thread directions.

[0011] As a further technical solution of the present invention, two stabilizing rods are also fixedly installed inside the fixed frame. The two stabilizing rods are located at the front and rear of the bidirectional lead screw. The three fixing blocks are all slidably connected to the two stabilizing rods. The connecting plate is fixedly installed on the top plate of the fixed frame.

[0012] As a further technical solution of the present invention, the aeration mechanism includes a submersible motor, a fixing plate fixedly installed on the outside of the submersible motor, shafts fixedly installed on both sides of the fixing plate, the fixing plate being rotatably connected to the corresponding vertical plate through the shafts on both sides, a connecting box fixedly connected to the bottom of the submersible motor, a fixing plate fixedly connected to the bottom of the connecting box, a negative pressure chamber fixedly installed at the bottom of the fixing plate, an impeller fixedly connected to the drive shaft of the submersible motor is provided inside the chamber, and a plurality of aeration cylinders are fixedly fixedly connected at equal intervals to the outside of the negative pressure chamber, and an air inlet pipe communicating with the negative pressure chamber is fixedly connected to the top of the fixing plate.

[0013] As a further technical solution of the present invention, the angle adjustment mechanism includes two parallel horizontal bars, and six slip rings are provided on the outside of the horizontal bars. The slip rings are slidably connected to the outside of the horizontal bars, and two slip rings on the same axis are fixedly connected to the near ends of each other with a synchronizing rod. A connecting ring is fixedly connected between two adjacent synchronizing rods, and a vertical bracket is also fixedly connected to the outside of the horizontal bars. A mounting base is also fixedly installed on the outside of the vertical bracket.

[0014] As a further technical solution of the present invention, the shaft passes through the outer side of the vertical plate, the connecting ring is fixedly connected to the end of the shaft, the vertical bracket extends upward to the upper part of the fixed frame, and fixed seats are fixedly installed at both the front and rear parts of the fixed frame. An electric push rod is provided between the fixed seat and the mounting seat on the same vertical axis, and the two ends of the electric push rod are movably connected to the fixed seat and the mounting seat respectively.

[0015] The beneficial effects of this invention are as follows: By setting up a lifting mechanism, the invention drives the lead screw slider to move, which in turn drives the connecting rod to move, and then drives the guide rod to move. This allows the aeration height of the aeration mechanism to be changed. The immersion depth of the aerator can be flexibly adjusted according to the water depth, water level changes and treatment process requirements, so that the air-water mixed jet acts on the optimal water area. This ensures both oxygenation efficiency and mixing effect, avoids equipment bottoming out and siltation, and facilitates equipment inspection and maintenance. It is suitable for different water depth conditions. By setting up an adjustable spacing mechanism and driving the bidirectional screw to rotate, the fixed blocks on both sides move away from or closer to the fixed block in the middle, thereby moving each aeration mechanism closer or further away, realizing the spacing adjustment of adjacent aeration mechanisms. According to the width of the tank and the treatment load, multiple aerators can be adjusted synchronously at equal intervals to ensure uniform jet coverage, no overlap, and no blind spots, improving the overall uniformity of aeration and mixing. It is suitable for tanks of different widths and various water treatment processes, with strong versatility and convenient adjustment. By setting an angle adjustment mechanism, the vertical support is tilted, and the horizontal bar moves, causing the connecting ring to rotate, which in turn causes the shaft to rotate, thus tilting the aeration mechanism. This allows for adjustment of the aeration angle, enabling multiple aerators to simultaneously deflect horizontally and uniformly form a leftward, rightward, or vertical spray pattern. This creates a stable and orderly circulation or strongly disturbed flow field within the pool, avoiding water flow collisions and stagnant water zones, improving the overall water circulation capacity and aeration uniformity of the pool, and adapting to different pool types and flow field requirements. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural diagram of the lifting mechanism in this invention; Figure 3This is a bottom view of the adjusting mechanism in this invention; Figure 4 This is a structural diagram of the aeration mechanism in this invention; Figure 5 This is a structural diagram of the angle adjustment mechanism in this invention.

[0018] In the diagram: 1. Lifting mechanism; 11. Bearing plate; 12. Drive screw; 13. Guide rod; 14. Screw slider; 15. Connecting rod; 16. Guide sleeve; 2. Adjustment mechanism; 21. Fixed frame; 22. Bidirectional screw; 23. Corrugated sleeve; 24. Fixed block; 25. Vertical plate; 26. Connecting seat; 3. Connecting plate; 4. Aeration mechanism; 41. Submersible motor; 42. Fixed plate; 43. Shaft; 44. Connecting box; 45. Fixed plate; 46. Aeration cylinder; 47. Air inlet pipe; 5. Angle adjustment mechanism; 51. Horizontal bar; 52. Connecting ring; 53. Synchronizing rod; 54. Slip ring; 55. Vertical support; 56. Mounting seat. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-5 As shown, a height-adjustable sewage treatment aeration device includes a lifting mechanism 1 and an adjusting mechanism 2. The lifting mechanism 1 is located above the adjusting mechanism 2, and connecting plates 3 are fixedly installed on the top of both sides of the adjusting mechanism 2. The lifting mechanism 1 is fixedly connected to the top of the connecting plates 3. An aeration mechanism 4 is movably installed at the bottom of the adjusting mechanism 2, and angle adjusting mechanisms 5 for adjusting the angle of the aeration mechanism 4 are movably installed at the front and rear of the lifting mechanism 1.

[0021] The lifting mechanism 1 includes a support plate 11. A drive screw 12 is rotatably mounted at the top center of the support plate 11. Two guide sleeves 16 are embedded on the support plate 11. The two guide sleeves 16 are located on both sides of the drive screw 12. A guide rod 13 is slidably mounted inside the guide sleeve 16. A screw slider 14 is threadedly connected to the outside of the drive screw 12. A connecting rod 15 is fixedly connected to both sides of the screw slider 14. The far ends of the two connecting rods 15 are fixedly connected to the corresponding guide rod 13 through a fixing ring. The connecting plate 3 is arranged in an inverted L-shape. A flange is fixedly mounted at the bottom end of the guide rod 13. The flange is fixedly connected to the top surface of the connecting plate 3.

[0022] Specifically, a drive motor is installed at the bottom of the bearing plate 11 to drive the lead screw 12 to rotate. As the lead screw 12 rotates, the lead screw slider 14 moves on its surface, thereby driving the fixed ring at the end of the connecting rod 15 to move. The fixed ring drives the guide rod 13 to move, thereby driving the adjustment mechanism 2 to move, and then driving the aeration mechanism 4 to make a height adjustment, thereby realizing the adjustment of the aeration height.

[0023] The adjusting mechanism 2 includes a fixed frame 21. A bidirectional lead screw 22 is rotatably mounted in the middle of the fixed frame 21. Three fixing blocks 24 are equidistantly arranged on the outside of the bidirectional lead screw 22. A through groove is opened in the middle fixing block 24. The bidirectional lead screw 22 passes through the through groove but does not contact the through groove. The fixing blocks 24 on both sides are threadedly connected to the bidirectional lead screw 22 through a nut slider. Vertical plates 25 are fixedly installed on both sides of the bottom of the fixing blocks 24. One end of the bidirectional lead screw 22 passes through the fixed frame 21 and is fixedly connected to a connecting seat 26. A corrugated sleeve 23 is provided on the outside of the threaded end of the bidirectional lead screw 22. Both ends of the threaded sleeve 23 are fixedly connected with sealing rings. One sealing ring is fixedly connected to the bidirectional lead screw 22, and the other sealing ring is fixedly connected to the side wall of the corresponding fixing block 24. The middle part of the bidirectional lead screw 22 is a smooth section, and the two sides of the smooth section are threaded sections with opposite thread directions. The fixing blocks 24 on both sides are respectively connected to the two threaded sections with opposite thread directions. Two stabilizing rods are also fixedly installed inside the fixing frame 21. The two stabilizing rods are located at the front and rear of the bidirectional lead screw 22. The three fixing blocks 24 are all slidably connected to the two stabilizing rods. The connecting plate 3 is fixedly installed on the top of the fixing frame 21.

[0024] Specifically, by connecting an external drive device to the connecting seat 26 to drive the bidirectional lead screw 22 to rotate, the middle fixed block 24 remains stationary, and the fixed blocks 24 on both sides move closer or further away under the action of opposite thread sections, thereby realizing the spacing adjustment of the three aeration mechanisms 4. As the fixed blocks 24 move, the corrugated sleeve 23 adapts to the movement of the fixed blocks 24, always covering the outside of the thread section to protect it and avoid damage to the thread section.

[0025] The aeration mechanism 4 includes a submersible motor 41. A fixing plate 42 is fixedly installed on the outside of the submersible motor 41. Shafts 43 are fixedly installed on both sides of the fixing plate 42. The fixing plate 42 is rotatably connected to the corresponding vertical plate 25 through the shafts 43 on both sides. A connecting box 44 is fixedly connected to the bottom of the submersible motor 41. A fixing plate 45 is fixedly connected to the bottom of the connecting box 44. A negative pressure chamber is fixedly installed at the bottom of the fixing plate 45. An impeller fixedly connected to the drive shaft of the submersible motor 41 is installed inside the chamber. Several aeration cylinders 46 are fixedly connected at equal intervals to the outside of the negative pressure chamber. An air inlet pipe 47 communicating with the negative pressure chamber is fixedly connected to the top of the fixing plate 45.

[0026] Specifically, during aeration, the aeration unit 4 is submerged in the water. When the submersible motor 41 is powered on, it rotates at high speed, driving the impeller to rotate in the negative pressure chamber. Under the action of negative pressure, external air is drawn in through the air inlet pipe 47 and fully mixed and sheared with the water to form an air-water mixture. Under the action of centrifugal force, the air-water mixture is sprayed out at high speed from the negative pressure chamber to multiple aeration cylinders 46 in a swirling manner, forming a strong turbulent and strongly mixed swirling flow field in a local area, achieving efficient aeration, oxygenation and stirring.

[0027] The angle adjustment mechanism 5 includes two parallel crossbars 51, and six slip rings 54 are provided on the outside of the crossbars 51. The slip rings 54 are slidably connected to the outside of the crossbars 51, and the two slip rings 54 on the same axis are fixedly connected to the near ends of the two slip rings 54. A connecting ring 52 is fixedly connected between two adjacent synchronous rods 53. A vertical bracket 55 is also fixedly connected to the outside of the crossbars 51. A mounting seat 56 is fixedly installed on the outside of the vertical bracket 55. The shaft 43 passes through the outside of the vertical plate 25. The connecting ring 52 is fixedly connected to the end of the shaft 43. The vertical bracket 55 extends upward to the upper part of the fixed frame 21. Fixed seats are fixedly installed at the front and rear parts of the fixed frame 21. An electric push rod is provided between the fixed seat and the mounting seat 56 on the same vertical axis. The two ends of the electric push rod are movably connected to the fixed seat and the mounting seat 56, respectively.

[0028] Specifically, by extending the electric actuator, the vertical support 55 is tilted, thereby lifting the horizontal bar 51, which in turn causes the corresponding connecting ring 52 to rotate. The connecting ring 52 then drives the shaft 43 to rotate, thereby changing the tilt angle of the aeration mechanism 4 and achieving aeration at different angles. The electric actuator has a waterproof effect, which is existing technology and will not be described in detail.

[0029] This invention discloses an adjustable sewage treatment aeration device. In use, the support plate 11 is first erected above the sedimentation tank. The height is adjusted according to the usage requirements. By rotating the drive screw 12, the screw slider 14 moves on its surface, thereby driving the fixed ring at the end of the connecting rod 15 to move. The fixed ring drives the guide rod 13 to move, thereby driving the adjustment mechanism 2 to move, and then driving the aeration mechanism 4 to make a height adjustment, thus realizing the adjustment of the aeration height.

[0030] Next, the spacing between each aeration mechanism 4 is adjusted. By connecting an external drive device to the connecting seat 26 to drive the bidirectional lead screw 22 to rotate, the middle fixed block 24 remains stationary, and the fixed blocks 24 on both sides move closer or further away under the action of opposite thread sections, thereby realizing the spacing adjustment of the three aeration mechanisms 4. When adjusting the spacing, the slip ring 54 moves adaptively on the crossbar 51 as the fixed block 24 moves.

[0031] After the height and spacing of the aeration mechanism 4 are adjusted, it enters the water body. During aeration, the submersible motor 41 is powered on and rotates at high speed, driving the impeller to rotate in the negative pressure chamber. Under the action of negative pressure, external air is drawn in through the air inlet pipe 47 and fully mixed and sheared with the water to form an air-water mixture. Under the action of centrifugal force, the air-water mixture is sprayed out at high speed from the negative pressure chamber to multiple aeration cylinders 46 in a swirling manner, forming a strong turbulent and strong mixing swirling flow field in a local area, realizing efficient aeration, oxygenation and stirring.

[0032] When the aeration angle needs to be adjusted, the electric push rod extends, causing one of the vertical supports 55 to tilt, thereby lifting the horizontal bar 51, which in turn causes the corresponding connecting ring 52 to rotate. The connecting ring 52 drives the shaft 43 to rotate, and the other electric push rod retracts accordingly to adapt to the change in angle. By adjusting the two vertical supports 55 to different tilt angles, the aeration mechanism 4 can aerate to the left or right.

[0033] The aeration mechanism 4 deflects to the left, so that the air-water mixture flow carries a tangential component to the left while being pushed forward. This tangential component, combined with the constraint of the pool wall, can form a stable clockwise overall circulation within the pool. This flow field mode is particularly suitable for layouts where the inlet is located on the right side of the pool and the outlet is located on the left side. It can effectively guide the inlet water to flow along a clockwise path, improve aeration and mixing efficiency, and avoid the formation of dead water zones.

[0034] The aeration mechanism 4 deflects to the right, so that the air-water mixture is pushed forward while carrying a tangential component to the right. This tangential component, combined with the constraint of the pool wall, can form a stable counterclockwise overall circulation in the pool. This flow field mode is more suitable for the layout where the inlet is located on the left side of the pool and the outlet is located on the right side. It can guide the inlet water to circulate fully along the counterclockwise path and ensure that the water in the whole pool is treated evenly.

[0035] The aeration unit 4 provides vertical aeration, and the air-water mixture flows directly into the central area of ​​the tank, creating a strong local disturbance and mixing effect. It is suitable for narrow tanks, square tanks, small treatment tanks, and other conditions where a large circulation is not required, but only strong stirring and rapid mixing in the middle are needed.

[0036] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A height-adjustable sewage treatment aeration device, characterized in that, It includes a lifting mechanism (1) and an adjusting mechanism (2). The lifting mechanism (1) is located above the adjusting mechanism (2), and connecting plates (3) are fixedly installed on the top of both sides of the adjusting mechanism (2). The lifting mechanism (1) is fixedly connected to the top of the connecting plate (3). An aeration mechanism (4) is movably installed at the bottom of the adjusting mechanism (2), and an angle adjusting mechanism (5) for adjusting the angle of the aeration mechanism (4) is movably installed at the front and rear of the lifting mechanism (1). The lifting mechanism (1) includes a bearing plate (11), a drive screw (12) is rotatably mounted on the top center of the bearing plate (11), and two guide sleeves (16) are embedded on the bearing plate (11). The two guide sleeves (16) are located on both sides of the drive screw (12). A guide rod (13) is slidably mounted inside the guide sleeve (16). A screw slider (14) is threadedly connected to the outside of the drive screw (12), and connecting rods (15) are fixedly connected to both sides of the screw slider (14). The far ends of the two connecting rods (15) are fixedly connected to the corresponding guide rods (13) through fixing rings. The adjusting mechanism (2) includes a fixed frame (21), a bidirectional lead screw (22) is rotatably installed in the middle of the fixed frame (21), and three fixed blocks (24) are equidistantly arranged on the outside of the bidirectional lead screw (22). A through groove is opened in the fixed block (24) located in the middle. The bidirectional lead screw (22) passes through the through groove and does not contact the through groove. The fixed blocks (24) on both sides are threadedly connected to the bidirectional lead screw (22) through the nut slider. Vertical plates (25) are fixedly installed on both sides of the bottom of the fixed blocks (24). One end of the bidirectional lead screw (22) passes through the fixed frame (21) and is fixedly connected to the connecting seat (26). A corrugated sleeve (23) is provided on the outside of the threaded end of the bidirectional lead screw (22). The aeration mechanism (4) includes a submersible motor (41), a fixing plate (42) is fixedly installed on the outside of the submersible motor (41), and shafts (43) are fixedly installed on both sides of the fixing plate (42). The fixing plate (42) is rotatably connected to the corresponding vertical plate (25) through the shafts (43) on both sides. The angle adjustment mechanism (5) includes two parallel crossbars (51), and six slip rings (54) are provided on the outside of the crossbars (51). The slip rings (54) are slidably connected to the outside of the crossbars (51), and the two slip rings (54) on the same axis are fixedly connected to the near ends of the synchronous rods (53). A connecting ring (52) is fixedly connected between two adjacent synchronous rods (53), and a vertical bracket (55) is also fixedly connected to the outside of the crossbars (51). A mounting base (56) is also fixedly installed on the outside of the vertical bracket (55).

2. The adjustable sewage treatment aeration device according to claim 1, characterized in that, The connecting plate (3) is arranged in an inverted L-shape, and a flange is fixedly installed at the bottom end of the guide rod (13). The flange is fixedly connected to the top surface of the connecting plate (3).

3. The adjustable sewage treatment aeration device according to claim 1, characterized in that, Both ends of the corrugated sleeve (23) are fixedly connected with sealing rings. One sealing ring is fixedly connected to the bidirectional screw (22), and the other sealing ring is fixedly connected to the side wall of the corresponding fixing block (24).

4. The adjustable sewage treatment aeration device according to claim 3, characterized in that, The middle part of the bidirectional lead screw (22) is a smooth section, and the two sides of the smooth section are threaded sections with opposite thread directions. The fixing blocks (24) on both sides are respectively connected to the two threaded sections with opposite thread directions.

5. The adjustable sewage treatment aeration device according to claim 4, characterized in that, The fixed frame (21) is also fixedly installed with two stabilizing rods. The two stabilizing rods are located at the front and rear of the bidirectional lead screw (22). The three fixing blocks (24) are all slidably connected to the two stabilizing rods. The connecting plate (3) is fixedly installed on the top of the fixed frame (21).

6. The adjustable sewage treatment aeration device according to claim 5, characterized in that, A connecting box (44) is fixedly connected to the bottom of the submersible motor (41), and a fixed plate (45) is fixedly connected to the bottom of the connecting box (44). A negative pressure chamber is fixedly installed at the bottom of the fixed plate (45), and an impeller fixedly connected to the drive shaft of the submersible motor (41) is provided inside it. Several aeration cylinders (46) are fixedly connected at equal intervals to the outside of the negative pressure chamber. An air inlet pipe (47) communicating with the negative pressure chamber is fixedly connected to the top of the fixed plate (45).

7. The adjustable sewage treatment aeration device according to claim 6, characterized in that, The shaft (43) passes through the outside of the vertical plate (25), and the connecting ring (52) is fixedly connected to the end of the shaft (43). The vertical bracket (55) extends upward to the upper part of the fixed frame (21). Fixed seats are fixedly installed at both the front and rear parts of the fixed frame (21). An electric push rod is provided between the fixed seat and the mounting seat (56) on the same vertical axis. The two ends of the electric push rod are movably connected to the fixed seat and the mounting seat (56) respectively.

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