Mud scraping device for sewage treatment

Abstract

This invention relates to a sludge scraping device for wastewater treatment, specifically to the field of separation equipment technology. It includes a sedimentation tank containing a rotating sludge scraper shell. The water-facing side of the scraper shell has a sludge inlet opening. A solid material separation and extraction frame moves vertically up and down from the sludge inlet opening. A guide plate, which slides back and forth on the bottom surface of the scraper shell, rubs against the bottom surface of the sedimentation tank. Several sludge outlet pipes are connected in parallel to the scraper shell, and these pipes are connected to a sludge discharge mechanism. The outlet end of the sludge discharge mechanism is connected to a sludge temporary storage tank. This invention solves the problems of deformation caused by the tight adhesion of sludge to the bottom of the tank in traditional sludge scraping structures used in large circular sedimentation tanks; and the problem that large solid materials are easily mixed into the sludge, damaging the sludge conveying structure and requiring secondary separation of large solid materials, thus reducing scraping efficiency.

Description

Technical Field

[0001] This invention relates to the field of separation device technology, specifically to a sludge scraping device for wastewater treatment. Background Technology

[0002] Sedimentation tanks are widely used in wastewater treatment. However, prolonged sedimentation and collection of sludge from wastewater can lead to a large accumulation of sludge at the bottom of the sedimentation tank. If not treated in time, this can affect the sedimentation effect of the tank, and in severe cases, damage the sludge scraper, as well as increase maintenance costs.

[0003] A patent with publication number CN213698928U is disclosed in the prior art, which includes a sedimentation tank body. One end of the sedimentation tank body is provided with an inlet, and the other end of the sedimentation tank body is provided with an outlet. A protective frame is fixedly installed on one side of the sedimentation tank body, and a servo motor is fixedly installed on one side of the outlet. Through the coordinated use of a moving plate, a telescopic device, a movable plate, and a connecting rod, it is possible to perform layer-by-layer cleaning of thick sludge, better protect the scraper blades of the sludge scraper, and thus reduce maintenance costs.

[0004] As these existing technologies, including the aforementioned patents, have been used, their shortcomings have gradually become apparent, mainly in the following aspects: First, with use, sludge tends to adhere to the bottom of existing circular sedimentation tanks. The tight adhesion of the sludge to the bottom causes deformation of the existing scraping structure when used in large circular sedimentation tanks, affecting scraping efficiency.

[0005] Secondly, the sludge in the existing sedimentation tank contains a large number of large solid objects, such as stones and bricks. This makes it easy for large solid objects to get mixed into the sludge during the sludge scraping process, which can damage the sludge transport structure. Furthermore, a secondary separation of large solid objects is required, which reduces the efficiency of sludge scraping.

[0006] Third, after the sludge is scraped out of the sedimentation tank, it contains a large amount of liquid and is irregularly shaped, which affects the efficiency of subsequent sludge collection and treatment.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a sludge scraping device for wastewater treatment. This device solves the problems of deformation caused by the tight adhesion of sludge to the bottom of large circular sedimentation tanks, the easy mixing of large solids with the sludge, damage to the sludge conveying structure, and the need for secondary separation of large solids, which reduces scraping efficiency.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A sludge scraping device for wastewater treatment includes a sedimentation tank. A sludge scraper shell is rotatably mounted inside the sedimentation tank. The water-facing side of the scraper shell has a sludge inlet opening. A solids separation and extraction frame is vertically movable along the sludge inlet opening. The bottom surface of the sludge scraper is equipped with a shovel guide plate that slides back and forth, making frictional contact with the bottom surface of the sedimentation tank. The sludge scraper shell has several sludge discharge pipes connected in parallel, and these sludge discharge pipes are connected to a sludge discharge mechanism. The outlet end of the sludge discharge mechanism is connected to a sludge storage tank, and a sludge-liquid separation plate is vertically raised and lowered inside the sludge storage tank.

[0010] As an optimized solution, the sludge liquid separation plate is provided with several vertically arranged sludge forming plates in parallel, and the several sludge forming plates are simultaneously raised and lowered vertically.

[0011] As an optimized solution, the sludge forming plate includes a rectangular frame, in which an elliptical rubber ball is fixed. When the elliptical rubber ball is inflated, it bulges and uses the area between two adjacent elliptical rubber balls to clamp the sludge block.

[0012] As an optimized solution, the sludge storage tank and the sedimentation tank are connected by a liquid return pipe, and a filter plate is detachably inserted into the liquid return pipe.

[0013] As an optimized solution, the top of the sedimentation tank is provided with a horizontal walking walkway, and a rotating pipe is provided vertically on the walking walkway. The lower end of the rotating pipe is connected to a T-shaped pipe, and the other two ports of the T-shaped pipe are respectively fixed to branch pipes horizontally. The upper ends of several sludge discharge pipes are respectively connected to the branch pipes.

[0014] As an optimized solution, the lower end of the three-way pipe is vertically fixed with a guide column with a rhomboid cross section, and two mud scraper shells are provided, with their inner ends respectively fixed to the opposite outer walls of the guide column.

[0015] As an optimized solution, the upper end of the rotating pipe is rotatably connected to an elbow, the elbow is connected to a sludge pump through a pipe, and the outlet end of the sludge pump is connected to the sludge temporary storage tank.

[0016] As an optimized solution, the solids separation and extraction frame includes a vertical mesh plate section that blocks solids from entering the sludge inlet, and a horizontal mesh plate section that carries the solids is horizontally fixed to the lower end of the vertical mesh plate section.

[0017] As an optimized solution, a support base is horizontally fixed to the back of the inner side of the scraper shell. Several drive motors are fixedly mounted side by side on the lower surface of the support base. A crank is fixedly mounted to the output shaft of the drive motor. A rocker arm is hinged to the other end of the crank. A rectangular sliding hole is formed on the bottom surface of the scraper shell along the sliding direction of the shovel guide plate. A slider is slidably mounted in the rectangular sliding hole. The upper end of the slider is hinged to the other end of the rocker arm, and the lower end of the slider is fixed to the upper surface of the shovel guide plate.

[0018] As an optimized solution, a guide plate extending into the back of the scraper shell is obliquely fixed to the lower edge of the sludge inlet opening, and the guide plate shields the drive motor.

[0019] As an optimized solution, a guide seat is fixedly connected to the outer wall of the sludge discharge pipe, and a guide hole is provided on the guide seat. A lifting rack is vertically slidably arranged in the guide hole. The lower end of the lifting rack is fixedly connected to the top of the vertical mesh plate section through a connecting frame. A drive motor is fixedly connected to the outer wall of the guide seat, and a drive gear that meshes with the lifting rack is fixedly connected to the output shaft of the drive motor.

[0020] As an optimized solution, a gear ring is fixedly connected to the outer wall of the rotating tube, and a speed reducer is fixedly connected to the traveling walkway. The output shaft of the speed reducer meshes with the gear ring through a gear.

[0021] As an optimized solution, the upper ends of several of the sludge forming plates are jointly fixed to a cavity shell, the air nozzle of the elliptical rubber ball is connected to the cavity shell, and the upper end of the cavity shell is fixed to an air inlet / outlet cylinder that communicates with its inner cavity.

[0022] As an optimized solution, the sludge-liquid separation plate is provided with a clearance hole for each of the sludge forming plates, and the sludge forming plates are slidably disposed in the clearance holes.

[0023] As an optimized solution, a mounting frame is fixedly connected to the upper end of the sludge-liquid separation plate, an upper telescopic cylinder is fixedly connected to the upper end of the mounting frame, and a lower telescopic cylinder is fixedly connected to the lower surface of the mounting frame in parallel. The telescopic end of the lower telescopic cylinder is fixedly connected to the upper surface of the cavity shell.

[0024] Compared with the prior art, the beneficial effects of the present invention are: The sedimentation tank is used to settle the sludge. When the sludge needs to be removed, the reducer drives the rotating pipe to rotate, which in turn drives the scraper shell to rotate through the branch pipe and sludge discharge pipe. This scrapes up the sludge from the bottom of the sedimentation tank and collects it through the sludge inlet on the water-facing side of the scraper shell. At the same time, the sludge pump works and uses the sludge discharge pipe, branch pipe, and rotating pipe to transport the sludge to the sludge temporary storage tank for temporary storage, thus completing the sludge removal work. The inner bottom surface of the sludge scraper shell uses a drive motor to move the shovel guide plate back and forth, so as to separate the sludge from the bottom of the sedimentation tank in advance, making it easier for the sludge to enter the sludge inlet. This effectively overcomes the problem of deformation of the overall structure caused by the forced scraping of the sludge attached to the bottom of the tank. The sludge inlet is equipped with vertical mesh sections to block large objects in the sludge, preventing them from being sucked away with the sludge and overcoming the impact of large objects on the sludge conveying structure. A horizontal mesh section is connected to the lower end of the vertical mesh section, allowing the scraper to collect large objects on the horizontal mesh section during movement. When it is necessary to separate large objects from the sedimentation tank, the drive motor raises the lifting rack, and the horizontal mesh section lifts the large objects from the bottom of the tank to the top, making it easy for operators to remove them. This achieves the separation of large objects from the sludge, thereby improving scraping efficiency. The sludge enters the sludge temporary storage tank for temporary storage. The upper telescopic cylinder drives the sludge-liquid separation plate to descend, compressing the sludge. The liquid in the sludge passes through the filter plate and flows back to the sedimentation tank along the return pipe, achieving the compression and separation of the liquid in the sludge. After the liquid in the sludge is separated, the lower telescopic cylinder drives the sludge forming plate to descend, cutting the sludge below into blocks. This block-forming process is then completed. Gas is introduced through the air inlet and outlet cylinders, causing the elliptical rubber ball to expand and reduce the gap between the two sludge forming plates, thus clamping the sludge blocks. The upper telescopic cylinder rises, lifting the sludge blocks to the top of the sludge temporary storage tank. Then, a loader positioned below the sludge blocks releases air through the air inlet and outlet cylinders, causing the elliptical rubber ball to contract and the sludge blocks to fall into the loader, completing the sludge block removal process. This improves the efficiency of subsequent sludge collection and treatment. This sludge block removal method can make full use of vertical space, thereby reducing the occupation of horizontal space and facilitating site layout. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the shovel guide plate of the present invention; Figure 3 This is a schematic diagram of the structure of the elliptical rubber ball of the present invention.

[0027] In the diagram: 1-Sedimentation tank; 2-Sludge temporary storage tank; 3-Sludge scraper; 4-Solid separation and lifting frame; 5-Sludge discharge pipe; 6-Lifting rack; 7-Guide seat; 8-Branch pipe; 9-Walking walkway; 10-Turn pipe; 11-Gear ring; 12-Reducer; 13-T-connector; 14-Guide column; 15-Sludge pump; 16-Return pipe; 17-Filter plate; 18-Sludge-liquid separation plate; 19-Sludge... 20-Cavity shell; 21-Inlet / outlet air cylinder; 22-Lower telescopic cylinder; 23-Mounting bracket; 24-Upper telescopic cylinder; 25-Vertical mesh plate section; 26-Horizontal mesh plate section; 27-Shovel guide plate; 28-Guide plate; 29-Sludge inlet opening; 30-Support base; 31-Drive motor; 32-Crank; 33-Rock arm; 34-Rectangular sliding hole; 35-Slider; 36-Driver; 37-Oval rubber ball. Detailed Implementation

[0028] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0029] like Figures 1 to 3 As shown, the sludge scraping device for wastewater treatment includes a sedimentation tank 1. A sludge scraper shell 3 is rotatably installed inside the sedimentation tank 1. The water-facing side of the sludge scraper shell 3 has a sludge inlet opening 29. A solids separation and lifting frame 4 is vertically raised and lowered along the sludge inlet opening 29. The bottom surface of the sludge scraper 3 is equipped with a shovel guide plate 27 that slides back and forth, making frictional contact with the bottom surface of the sedimentation tank. Several sludge discharge pipes 5 are connected in parallel on the sludge scraper shell 3, and the sludge discharge pipes 5 are connected to a sludge discharge mechanism. The outlet end of the sludge discharge mechanism is connected to a sludge storage tank 2, and a sludge liquid separation plate 18 is vertically raised and lowered inside the sludge storage tank 2.

[0030] Several vertically arranged sludge forming plates 19 are arranged side by side on the sludge liquid separation plate 18, and the several sludge forming plates 19 are simultaneously raised and lowered vertically.

[0031] The sludge forming plate 19 includes a rectangular frame, and an elliptical rubber ball 37 is fixed inside the rectangular frame. When the elliptical rubber ball 37 is inflated, it bulges up and uses the area between two adjacent elliptical rubber balls 37 to clamp the sludge block.

[0032] The sludge storage tank 2 and the sedimentation tank 1 are connected by a liquid return pipe 16, and a filter plate 17 is detachably inserted into the liquid return pipe 16.

[0033] The top of the sedimentation tank 1 is provided with a horizontal walking walkway 9. A rotating pipe 10 is vertically rotatably installed on the walking walkway 9. The lower end of the rotating pipe 10 is connected to a three-way pipe 13. The other two ports of the three-way pipe 13 are respectively horizontally fixed to branch pipes 8. The upper ends of several sludge discharge pipes 5 are respectively connected to the branch pipes 8.

[0034] The lower end of the three-way pipe 13 is vertically fixed with a rhomboid cross-section guide column 14. There are two mud scraper shells 3, and their inner ends are respectively fixed to the opposite outer walls of the guide column 14.

[0035] The upper end of the rotating pipe 10 is rotatably connected to an elbow, which is connected to a sludge pump 15 through a pipe. The outlet end of the sludge pump 15 is connected to the sludge temporary storage tank 2.

[0036] The solid separation and extraction frame 4 includes a vertical mesh plate section 25 that blocks solids from entering the sludge inlet opening 29, and a horizontal mesh plate section 26 that carries solids is horizontally fixed to the lower end of the vertical mesh plate section 25.

[0037] A support base 30 is horizontally fixed to the back of the inner side of the scraper shell 3. Several drive motors 31 are fixed in parallel on the lower surface of the support base 30. A crank 32 is fixed to the output shaft of the drive motor 31. A rocker arm 33 is hinged to the other end of the crank 32. A rectangular sliding hole 34 is provided on the bottom surface of the scraper shell 3 along the sliding direction of the scraper guide plate 27. A slider 35 is slidably provided in the rectangular sliding hole 34. The upper end of the slider 35 is hinged to the other end of the rocker arm 33, and the lower end of the slider 35 is fixed to the upper surface of the scraper guide plate 27.

[0038] A guide plate 28 extending toward the back of the scraper shell 3 is obliquely fixed to the lower edge of the sludge entry opening 29, and the guide plate 28 blocks the drive motor 31.

[0039] A guide seat 7 is fixedly connected to the outer wall of the sludge discharge pipe 5. A guide hole is provided on the guide seat 7. A lifting rack 6 is vertically slidably arranged in the guide hole. The lower end of the lifting rack 6 is fixedly connected to the top of the vertical mesh plate section 25 through a connecting frame. A drive motor 36 is fixedly connected to the outer wall of the guide seat 7. A drive gear that meshes with the lifting rack 6 is fixedly connected to the output shaft of the drive motor 36.

[0040] A gear ring 11 is fixedly connected to the outer wall of the rotating tube 10, and a speed reducer 12 is fixedly connected to the traveling walkway 9. The output shaft of the speed reducer 12 meshes with the gear ring 11 through a gear.

[0041] A cavity shell 20 is fixedly connected to the upper end of several sludge forming plates 19. The air nozzle of the elliptical rubber ball 37 is connected to the cavity shell 20. An air inlet / outlet cylinder 21 that connects to the inner cavity is fixedly connected to the upper end of the cavity shell 20.

[0042] The sludge liquid separation plate 18 has a clearance hole for each sludge forming plate 19, and the sludge forming plate 19 is slidably disposed in the clearance hole.

[0043] A mounting frame 23 is fixedly connected to the upper end of the sludge-liquid separation plate 18. An upper telescopic cylinder 24 is fixedly connected to the upper end of the mounting frame 23. A lower telescopic cylinder 22 is fixedly connected to the lower surface of the mounting frame 23. The telescopic end of the lower telescopic cylinder 22 is fixedly connected to the upper surface of the cavity shell 20.

[0044] The bottom surface of the sludge storage tank 2 is equipped with a pull-out horizontal sliding pad. By pulling out the pad, the bottom of the sludge block can be separated from the upper surface of the pad, making it easy to remove the sludge block from the sludge storage tank 2.

[0045] The working principle of this device is as follows: The sedimentation tank 1 is used to settle the sludge. When the sludge needs to be removed, the reducer 12 drives the rotating pipe 10 to rotate, and then the branch pipe 8 and the sludge discharge pipe 5 drive the scraper shell 3 to rotate, so as to scrape up the sludge at the bottom of the sedimentation tank. The sludge is collected into the sludge inlet 29 through the sludge inlet 29 on the water-facing side of the scraper shell 3. At the same time, the sludge pump 15 works, and the sludge is transported to the sludge temporary storage tank 2 through the sludge discharge pipe 5, the branch pipe 8, and the rotating pipe 10 for temporary storage, thus completing the sludge scraping work. The inner bottom surface of the sludge scraper shell 3 is driven by the drive motor 31 to move the shovel guide plate 27 back and forth, so as to separate the sludge from the bottom of the sedimentation tank 1 in advance, so that the sludge can enter the sludge inlet opening 29. This effectively overcomes the problem of deformation of the overall structure caused by the forced scraping of the sludge scraper shell 3 and the sludge attached to the bottom of the tank. The sludge entry opening 29 is blocked by a vertical mesh plate section 25, preventing large objects from being sucked away with the sludge and overcoming the impact of large objects on the sludge conveying structure. A horizontal mesh plate section 26 is connected to the lower end of the vertical mesh plate section 25, allowing the scraper shell 3 to collect large objects on the horizontal mesh plate section 26 during movement. When it is necessary to separate large objects from the sedimentation tank 1, the drive motor 36 drives the lifting rack 6 to rise, and the horizontal mesh plate section 26 lifts the large objects from the bottom of the tank to the top, making it easy for operators to remove the large objects from the horizontal mesh plate section 26. This achieves the separation of large objects in the sludge and improves the sludge scraping efficiency. The sludge enters the sludge temporary storage tank 2 for temporary storage. The upper telescopic cylinder 24 drives the sludge liquid separation plate 18 to descend, thereby squeezing the sludge. The liquid in the sludge passes through the filter plate 17 and flows back to the sedimentation tank 1 along the return pipe 16, achieving the squeezing and separation of the liquid in the sludge. After the liquid in the sludge is separated, the lower telescopic cylinder 22 drives the sludge forming plate 19 to descend, thereby cutting and forming the sludge into blocks. Then, gas is introduced through the air inlet / outlet cylinder 21, and elliptical rubber balls are formed. The expansion of cylinder 37 reduces the gap between the two sludge forming plates 19, thereby clamping the sludge block. The upper telescopic cylinder 24 rises, lifting the sludge block to above the sludge storage tank 2. Then, the loader is positioned below the sludge block, and the air inlet / outlet cylinder 21 releases air, causing the elliptical rubber ball 37 to contract. The sludge block falls into the loader, thus completing the sludge block export process. This improves the efficiency of subsequent sludge collection and processing. This sludge block export method can make full use of vertical space, thereby reducing the occupation of horizontal space and facilitating the layout and use of the site.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A sludge scraping device for wastewater treatment, characterized in that: The system includes a sedimentation tank (1), a sludge scraper (3) is provided inside the sedimentation tank (1) and a sludge inlet (29) is provided on the water-facing side of the sludge scraper (3). The sludge inlet (29) is provided with a solid separation and lifting frame (4) that moves vertically up and down. The bottom surface of the sludge scraper (3) is provided with a shovel guide plate (27) that slides back and forth and rubs against the bottom surface of the sedimentation tank (1). The sludge scraper shell (3) is connected in parallel to several sludge discharge pipes (5), and the several sludge discharge pipes (5) are connected to a sludge discharge mechanism. The outlet end of the sludge discharge mechanism is connected to a sludge storage tank (2), and a sludge liquid separation plate (18) is vertically raised and lowered inside the sludge storage tank (2). The sludge-liquid separation plate (18) is provided with several vertically arranged sludge forming plates (19) arranged side by side, and the several sludge forming plates (19) are simultaneously raised and lowered vertically. The sludge forming plate (19) includes a rectangular frame, within which an elliptical rubber ball (37) is fixed. When inflated, the elliptical rubber ball (37) bulges and clamps a block of sludge using the area between two adjacent elliptical rubber balls (37). The solid separation and extraction frame (4) includes a vertical mesh plate section (25) that blocks solids from entering the silt entry opening (29), and a horizontal mesh plate section (26) that carries solids is horizontally fixed to the lower end of the vertical mesh plate section (25). A guide seat (7) is fixedly connected to the outer wall of the sludge discharge pipe (5). A guide hole is provided on the guide seat (7). A lifting rack (6) is vertically slidably arranged in the guide hole. The lower end of the lifting rack (6) is fixedly connected to the top of the vertical mesh plate section (25) through a connecting frame. A drive motor (36) is fixedly connected to the outer wall of the guide seat (7). A drive gear that meshes with the lifting rack (6) is fixedly connected to the output shaft of the drive motor (36).

2. The sludge scraping device for wastewater treatment according to claim 1, characterized in that: The sludge storage tank (2) and the sedimentation tank (1) are connected by a liquid return pipe (16), and a filter plate (17) is detachably inserted on the liquid return pipe (16).

3. The sludge scraping device for wastewater treatment according to claim 1, characterized in that: The sedimentation tank (1) has a horizontal walkway (9) at the top, and a rotating pipe (10) is vertically mounted on the walkway (9). The lower end of the rotating pipe (10) is connected to a three-way pipe (13). The other two ports of the three-way pipe (13) are respectively horizontally fixed to branch pipes (8). The upper ends of several sludge discharge pipes (5) are respectively connected to the branch pipes (8). The lower end of the three-way pipe (13) is vertically fixed to a rhomboid-shaped guide column (14). There are two sludge scraper shells (3), and their inner ends are respectively fixed to the opposite outer walls of the guide column (14).

4. The sludge scraping device for wastewater treatment according to claim 1, characterized in that: A support base (30) is horizontally fixed to the back of the inner side of the mud scraper shell (3). Several drive motors (31) are fixed in parallel on the lower surface of the support base (30). A crank (32) is fixed to the output shaft of the drive motor (31). A rocker arm (33) is hinged to the other end of the crank (32). A rectangular sliding hole (34) is provided on the bottom surface of the mud scraper shell (3) along the sliding direction of the shovel guide plate (27). A slider (35) is slidably provided in the rectangular sliding hole (34). The upper end of the slider (35) is hinged to the other end of the rocker arm (33). The lower end of the slider (35) is fixed to the upper surface of the shovel guide plate (27).

5. The sludge scraping device for wastewater treatment according to claim 1, characterized in that: The upper ends of several of the sludge forming plates (19) are fixedly connected to a cavity shell (20), the air nozzle of the elliptical rubber ball (37) is connected to the cavity shell (20), and the upper end of the cavity shell (20) is fixedly connected to an air inlet / outlet cylinder (21) that communicates with its inner cavity.

6. The sludge scraping device for wastewater treatment according to claim 5, characterized in that: The upper end of the sludge liquid separation plate (18) is fixedly connected to a mounting frame (23), the upper end of the mounting frame (23) is fixedly connected to an upper telescopic cylinder (24), the lower surface of the mounting frame (23) is fixedly connected to a lower telescopic cylinder (22), and the telescopic end of the lower telescopic cylinder (22) is fixedly connected to the upper surface of the cavity shell (20).

Images