Automatic refining device for aluminum alloy liquid processing

Abstract

The invention provides an automatic refining device for aluminum alloy liquid processing, and belongs to the technical field of aluminum alloy liquid refining, the automatic refining device comprises a base, a rotating mechanism is arranged in the base, the rotating mechanism comprises a hydraulic cylinder, the hydraulic cylinder is arranged in the middle of the interior of the base, and the lower end of the hydraulic cylinder is rotationally connected with a fixing seat; a first servo motor is arranged in the left side of the fixing seat, a first straight gear is arranged at the power output end of the first servo motor, the left side of the first straight gear is connected with an annular toothed plate in a meshed mode, and the annular toothed plate is arranged on the inner wall of the base; by means of the rotating mechanism and the horizontal moving mechanism, the device can be rapidly fixed after moving to a working place, in the nitrogen conveying process, a nitrogen pipe can transversely rotate in molten aluminum alloy, it is ensured that a refining agent is evenly distributed in a melt, the use efficiency of nitrogen is optimized, energy consumption is reduced, and the service life of the device is prolonged. Impurities and gas in the melt are more effectively removed, and the refining effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy liquid refining, and specifically relates to an automatic refining device for aluminum alloy liquid processing. Background Art

[0002] During the aluminum alloy casting process, there is a very important process: degassing and refining of molten aluminum. The purpose of degassing and refining of molten aluminum is to obtain high-quality molten aluminum with less slag content and less gas content, so as to obtain high-quality castings and reduce the number of castings scrapped due to slag holes and gas holes; the working principle of the aluminum alloy degassing and refining machine is: through a high-speed rotating rotor, fine nitrogen bubbles are continuously ejected, which can effectively adsorb the slag and bubbles in the molten aluminum and float to the upper surface of the molten aluminum together, thereby obtaining high-quality molten aluminum.

[0003] In the prior art, after the pipe for transporting nitrogen in the aluminum alloy automatic refining device is inserted into the aluminum alloy liquid, it generally stays in one position, resulting in uneven distribution of nitrogen when blown into the aluminum alloy liquid and affecting the refining effect.

[0004] Therefore, we propose an automatic refining device for aluminum alloy liquid processing to solve the problems encountered above. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the pipe for transporting nitrogen in the aluminum alloy automatic refining device generally stays in one position after being inserted into the aluminum alloy liquid, resulting in uneven distribution of nitrogen when blown into the aluminum alloy liquid and affecting the refining effect, and to propose an automatic refining device for aluminum alloy liquid processing.

[0006] The purpose of the present invention can be achieved by the following technical solutions: including a base, a rotating mechanism is arranged inside the base, the rotating mechanism includes a hydraulic cylinder, and the hydraulic cylinder is arranged in the middle inside the base, the lower end of the hydraulic cylinder is rotatably connected to a fixed seat, a servo motor I is arranged inside the left side of the fixed seat, a spur gear I is arranged at the power output end of the servo motor I, the left side of the spur gear I is meshed and connected to an annular toothed plate, and the annular toothed plate is arranged on the inner wall of the base, a column is arranged at the left rear side of the upper surface of the base, a lifting seat is slidably mounted on the surface of the column, and a lifting mechanism and a horizontal movement mechanism are arranged inside the lifting seat.

[0007] As a preferred embodiment of the present invention, an annular rotating groove is opened inside the base, and an annular connecting plate is slidably mounted inside the annular rotating groove, and the lower end of the annular connecting plate is fixedly connected to the upper surface of the fixed seat.

[0008] As a preferred embodiment of the present invention, the lifting mechanism includes a mounting box fixedly installed at the front end of the lifting seat. A servo motor II is provided on the upper surface of the mounting box. The power output end of the servo motor II is drivingly connected to a rotating shaft I. A bevel gear I is provided at the lower end of the rotating shaft I. A bevel gear II is meshingly connected to the rear side of the bevel gear I. A worm is provided inside the bevel gear II. A worm gear is meshingly connected to the lower end of the worm. A vertical tooth plate is meshingly connected to the rear end of the worm gear, and the vertical tooth plate is provided on the front surface of the column.

[0009] As a preferred embodiment of the present invention, the front end of the worm is rotatably installed inside the mounting box. The worm gear is rotatably installed inside the mounting box through a shaft rod. A vertical through groove is provided at the rear side of the mounting box. The vertical tooth plate is provided inside the vertical through groove.

[0010] As a preferred embodiment of the present invention, the horizontal movement mechanism includes a servo motor III. The servo motor III is provided on the front surface of the lifting seat through a motor seat. The power output end of the servo motor III is drivingly connected to a rotating shaft II. A spur gear II is provided at the rear end of the rotating shaft II. A horizontal tooth plate is meshingly connected to the lower end of the spur gear II. A horizontal moving plate is provided at the lower end of the horizontal tooth plate, and the horizontal moving plate and the horizontal tooth plate are slidably installed inside the lifting seat.

[0011] As a preferred embodiment of the present invention, a chute is provided inside the front end of the lifting seat. The spur gear II is rotatably installed inside the chute. The horizontal tooth plate penetrates and is provided inside the chute.

[0012] As a preferred embodiment of the present invention, a transfer mechanism is provided at the right end of the horizontal moving plate. The transfer mechanism includes a mounting seat provided at the right end of the horizontal moving plate. A servo motor IV is provided at the left end of the upper surface of the mounting seat. A sprocket I is provided at the power output end of the servo motor IV. The sprocket I is drivingly connected to a sprocket II through a toothed chain. A rotating rod I is provided in the middle of the sprocket II. The rotating rod I is drivingly connected to a rotating rod II through a transmission belt. The rotating rod II is drivingly connected to a rotating rod III through a transmission belt. The front ends of the rotating rod I, the rotating rod II, and the rotating rod III are rotatably installed inside the mounting seat, and conveying rollers are provided on the circumferential surfaces of the front ends of the rotating rod I, the rotating rod II, and the rotating rod III.

[0013] As a preferred embodiment of the present invention, a nitrogen tank is provided at the left front end of the base surface, and an air outlet of the nitrogen tank is connected to a nitrogen pipe. The upper end of the nitrogen pipe is inserted inside the mounting seat and the horizontal moving plate. The upper ends of the three conveying rollers are all in contact with the lower surface of the nitrogen pipe. A U-shaped connecting plate is provided at the right front end of the front end of the lifting seat. A drag chain is provided inside the U-shaped connecting plate. The upper right end of the drag chain is connected to the upper end of the mounting seat.

[0014] Advantages of the present invention compared with the prior art:

[0015] (1) By providing a rotating mechanism and a horizontal moving mechanism, the device can be quickly fixed after moving to the working location, and during the process of transporting nitrogen, the nitrogen pipe can rotate horizontally inside the aluminum alloy liquid, ensuring that the refining agent is evenly distributed in the melt, optimizing the use efficiency of nitrogen, reducing energy consumption, more effectively removing impurities and gases in the melt, and improving the refining effect;

[0016] (2) By providing a lifting mechanism, the height of the nitrogen pipe inside the aluminum alloy liquid can be adjusted, optimizing the bubble distribution, thereby more effectively removing impurities and gases in the melt and ensuring the maximization of the gas discharge efficiency;

[0017] (3) By providing a transfer mechanism, the length of the left end of the upper part of the nitrogen pipe extending out of the horizontal moving plate can be adjusted, then facilitating the control of the length of the nitrogen pipe extending into the aluminum alloy liquid, and further facilitating the subsequent adjustment of the movement of the nitrogen pipe inside the aluminum alloy liquid by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is the first three-dimensional structure schematic diagram of the present invention;

[0020] Figure 2 It is the second three-dimensional structure schematic diagram of the present invention;

[0021] Figure 3 It is the front cross-sectional three-dimensional view of the present invention;

[0022] Figure 4 It is the first left cross-sectional three-dimensional structure schematic diagram of the present invention;

[0023] Figure 5 It is the second left cross-sectional three-dimensional structure schematic diagram of the present invention.

[0024] In the figure: 1. Base; 2. Rotating mechanism; 201. Hydraulic cylinder; 202. Fixed seat; 203. Ring-shaped connecting plate; 204. Servo motor 1; 205. Straight gear 1; 206. Ring-shaped toothed plate; 3. Column; 4. Lifting mechanism; 401. Installation box; 402. Servo motor 2; 403. Rotating shaft 1; 404. Bevel gear 1; 405. Bevel gear 2; 406. Worm; 407. Worm gear; 408. Vertical toothed plate; 5. Lifting seat; 6. Horizontal moving mechanism; 601. Servo motor 3; 602. Rotating shaft 2; 603. Straight gear 2; 604. Horizontal toothed plate; 605. Horizontal moving plate; 7. Transfer mechanism; 701. Mounting seat; 702. Servo motor 4; 703. Sprocket 1; 704. Sprocket 2; 705. Rotating rod 1; 706. Rotating rod 2; 707. Rotating rod 3; 708. Conveyor roller; 8. Drag chain; 9. U-shaped connecting plate; 10. Nitrogen tank; 11. Nitrogen pipe; 12. Ring-shaped rotating groove. Detailed implementation mode

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the protection scope of the present invention.

[0026] Embodiment

[0027] Please refer to Figure 1 - Figure 5 As shown in the figure, an automatic refining device for aluminum alloy liquid processing includes a base 1. A rotating mechanism 2 is arranged inside the base 1. The rotating mechanism 2 includes a hydraulic cylinder 201, and the hydraulic cylinder 201 is arranged in the middle inside the base 1. The lower end of the hydraulic cylinder 201 is rotatably connected to a fixed seat 202. A servo motor 1 204 is arranged inside the left side of the fixed seat 202. A straight gear 1 205 is arranged at the power output end of the servo motor 1 204. A ring-shaped toothed plate 206 is meshed and connected to the left side of the straight gear 1 205, and the ring-shaped toothed plate 206 is arranged on the inner wall of the base 1. An annular rotating groove 12 is opened inside the base 1, and a ring-shaped connecting plate 203 is slidably installed inside the annular rotating groove 12. The lower end of the ring-shaped connecting plate 203 is fixedly connected to the upper surface of the fixed seat 202. The arrangement of the annular rotating groove 12 provides a space for the vertical movement and horizontal rotation of the ring-shaped connecting plate 203, enabling the hydraulic cylinder 201 to drive the fixed seat 202 to move vertically smoothly. Then, after the fixed seat 202 fixes the position of the base 1, when the servo motor 1 204 drives the base 1 to rotate horizontally through the straight gear 1 205, the base 1 can rotate horizontally stably on the fixed seat 202 through the ring-shaped connecting plate 203;

[0028] It should be noted that a moving wheel is provided at the lower end of the base 1, which can move the entire device when the fixed seat 202 is not in contact with the ground. The fixed seat 202 is a counterweight block, and the lower surface of the fixed seat 202 is provided with anti-slip grooves to improve the fixing effect of the fixed seat 202, so that after the device is moved to the work site, the hydraulic cylinder 201 drives the fixed seat 202 to move downward until it contacts the ground, thereby fixing the device to prevent the movement of the device from affecting the subsequent refining effect of the aluminum alloy liquid.

[0029] A column 3 is arranged on the left rear side of the upper surface of the base 1, a lifting seat 5 is slidably installed on the surface of the column 3, a lifting mechanism 4 and a horizontal moving mechanism 6 are arranged inside the lifting seat 5, the lifting mechanism 4 includes an installation box 401, and the installation box 401 is fixedly installed on the front end of the lifting seat 5, a servo motor 2 402 is arranged on the upper surface of the installation box 401, a power output end of the servo motor 2 402 is connected to a rotating shaft 1 403 through a coupling transmission, a bevel gear 1 404 is arranged at the lower end of the rotating shaft 1 403, a bevel gear 1 404 is meshedly connected to a bevel gear 2 405 at the rear side of the bevel gear 1 404, a worm 406 is arranged inside the bevel gear 2 405, and a front end of the worm 406 The worm 406 is rotatably mounted inside the mounting box 401. The lower end of the worm 406 is meshedly connected with a worm wheel 407. The worm wheel 407 is rotatably mounted inside the mounting box 401 through a shaft, which can limit the worm 406 and the worm wheel 407 without affecting the rotation of the worm 406 and the worm wheel 407. The rear end of the worm wheel 407 is meshedly connected with a vertical tooth plate 408, and the vertical tooth plate 408 is arranged on the front side of the column 3. A vertical through groove is provided on the rear side of the mounting box 401. The vertical tooth plate 408 is arranged inside the vertical through groove. The setting of the vertical through groove provides an installation space for the vertical tooth plate 408, so that the worm wheel 407 can smoothly mesh with the vertical tooth plate 408 when rotating.

[0030] It should be noted that after starting the servo motor 2 402, the servo motor 2 402 drives the bevel gear 2 405 and the worm 406 to rotate through the rotating shaft 1 403 and the bevel gear 1 404, and then the worm 406 drives the worm wheel 407 to rotate, so that the worm wheel 407 engages with the vertical gear plate 408. Because the vertical gear plate 408 is fixedly mounted on the column 3, and the column 3 is fixed on the base 1, the worm wheel 407 will be subjected to a reaction force during the engagement process with the vertical gear plate 408, so that it can move vertically on the vertical gear plate 408, and then drive the installation box 401 and the lifting seat 5 to move smoothly in the vertical direction.

[0031] The horizontal moving mechanism 6 includes a servo motor 3 601, which is arranged on the front of the lifting seat 5 through a motor seat, and the power output end of the servo motor 3 601 is connected to the rotating shaft 2 602 through a coupling transmission, and a spur gear 2 603 is arranged at the rear end of the rotating shaft 2 602, and the lower end of the spur gear 2 603 is meshed and connected with a transverse tooth plate 604, and a slide groove is provided inside the front end of the lifting seat 5, and the spur gear 2 603 is rotatably installed inside the slide groove, and the transverse tooth plate 604 is arranged inside the slide groove. The setting of the slide groove provides a movable space for the spur gear 2 603 and the transverse tooth plate 604, so that the spur gear 2 603 can rotate smoothly, and at the same time, the transverse tooth plate 604 can smoothly move horizontally in the left and right directions, and a transverse moving plate 605 is arranged at the lower end of the transverse tooth plate 604, and the transverse moving plate 605 and the transverse tooth plate 604 are slidably installed inside the lifting seat 5;

[0032] A transfer mechanism 7 is arranged at the right end of the transverse moving plate 605, and the transfer mechanism 7 includes a mounting seat 701, and the mounting seat 701 is arranged at the right end of the transverse moving plate 605, and a servo motor 4 702 is arranged at the left end of the upper surface of the mounting seat 701, and a sprocket 1 703 is arranged at the power output end of the servo motor 4 702, and the sprocket 1 703 is connected to the sprocket 2 704 through a toothed chain transmission, and a rotating rod 1 705 is arranged in the middle of the sprocket 2 704, and the rotating rod 1 705 is connected to the rotating rod 2 706 through a transmission belt transmission, and the rotating rod 2 706 is connected to the rotating rod 3 707 through a transmission belt transmission, and the front ends of the rotating rod 1 705, the rotating rod 2 706 and the rotating rod 3 707 are all rotatably mounted inside the mounting seat 701, and the rotating rod 1 705, the rotating rod 706 and the rotating rod 3 707 are The circumferential surfaces of the front ends of the second and third rotating rods 706 and the third rotating rod 707 are provided with conveying rollers 708, the left front end of the surface of the base 1 is provided with a nitrogen tank 10, and the gas outlet of the nitrogen tank 10 is connected with a nitrogen pipe 11, the upper end of the nitrogen pipe 11 is inserted into the inside of the mounting seat 701 and the transverse moving plate 605, the upper ends of the three conveying rollers 708 are all in contact with the lower surface of the nitrogen pipe 11, a U-shaped connecting plate 9 is provided on the right side of the front end of the lifting seat 5, a drag chain 8 is provided inside the U-shaped connecting plate 9, and the upper right end of the drag chain 8 is connected to the upper end of the mounting seat 701, the setting of the drag chain 8 can make the mounting seat 701 and the lifting seat 5 more tightly connected, and can improve the stability of the mounting seat 701 without affecting the horizontal movement of the mounting seat 701 left and right;

[0033] It should be noted that the left end of the upper part of the nitrogen pipe 11 penetrates the transverse moving plate 605 and extends to the left side of the transverse moving plate 605, which facilitates the input of nitrogen into the aluminum alloy liquid, thereby assisting in the refining of the aluminum alloy liquid. The right side of the upper part of the nitrogen pipe 11 is in contact with the three conveying rollers 708, so that when the conveying rollers 708 rotate, it can smoothly drive the upper nitrogen pipe 11 to move horizontally left and right, thereby lengthening or shrinking the upper part of the nitrogen pipe 11 exposed from the transverse moving plate 605.

[0034] When the present invention is in use, during the refining process of aluminum alloy liquid, first move this refining device near the aluminum alloy liquid, then start the hydraulic cylinder 201. The hydraulic cylinder 201 drives the fixed seat 202 to move downward, making the fixed seat 202 contact the ground to fix the position of the base 1. Then start the fourth servo motor 702. The fourth servo motor 702 drives the first sprocket 703 to rotate. The first sprocket 703 drives the second sprocket 704 and the first rotating rod 705 to rotate through a toothed chain. The first rotating rod 705 drives the second rotating rod 706 to rotate through a transmission belt. The second rotating rod 706 drives the third rotating rod 707 to rotate through a transmission belt. Subsequently, the three conveying rollers 708 rotate together, causing the upper part of the nitrogen gas pipe 11 to move horizontally to the left, and pushing the left gas outlet at the upper part of the nitrogen gas pipe 11 into the aluminum alloy liquid;

[0035] Then, during the refining process, start the second servo motor 402. The second servo motor 402 operates to drive the first rotating shaft 403 and the first bevel gear 404 to rotate. The rotation of the first bevel gear 404 drives the second bevel gear 405 and the worm 406 to rotate. The rotation of the worm 406 drives the worm gear 407 to rotate, causing the worm gear 407 to mesh with the vertical toothed plate 408, thereby driving the installation box 401 and the lifting seat 5 to move in the vertical direction, and then being able to adjust the height of the nitrogen gas pipe 11 inside the aluminum alloy liquid;

[0036] Start the third servo motor 601. The third servo motor 601 drives the second rotating shaft 602 and the second spur gear 603 to rotate, enabling the horizontal toothed plate 604 to drive the horizontal moving plate 605 and the nitrogen gas pipe 11 to move horizontally. Start the first servo motor 204. The first servo motor 204 drives the first spur gear 205 to rotate, causing the first spur gear 205 to drive the annular toothed plate 206 and the base 1 to rotate slightly horizontally, and then being able to drive the nitrogen gas pipe 11 to move horizontally back and forth inside the aluminum alloy liquid, thereby optimizing the distribution of nitrogen gas bubbles, controlling the gas discharge efficiency, avoiding melt disturbance, homogenizing the refining effect, adapting to the melt flow, and reducing energy consumption, so as to ensure the quality and processing efficiency of the aluminum alloy liquid.

[0037] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An automatic refining device for aluminum alloy liquid processing, including a base (1), characterized in that, Inside the base (1), a rotating mechanism (2) is provided. The rotating mechanism (2) includes a hydraulic cylinder (201), and the hydraulic cylinder (201) is arranged in the middle inside the base (1). The lower end of the hydraulic cylinder (201) is rotatably connected to a fixed seat (202). Inside the left side of the fixed seat (202), a first servo motor (204) is provided. The power output end of the first servo motor (204) is provided with a first spur gear (205). The first spur gear (205) is meshed and connected to an annular toothed plate (206) on the left side, and the annular toothed plate (206) is arranged on the inner wall of the base (1). On the left rear side of the upper surface of the base (1), a column (3) is provided. A lifting seat (5) is slidably mounted on the surface of the column (3). Inside the lifting seat (5), a lifting mechanism (4) and a horizontal moving mechanism (6) are provided.

2. The automatic refining device for aluminum alloy liquid processing according to claim 1, wherein An annular rotating groove (12) is formed inside the base (1), and an annular connecting plate (203) is slidably mounted inside the annular rotating groove (12). The lower end of the annular connecting plate (203) is fixedly connected to the upper surface of the fixed seat (202).

3. An automatic refining device for aluminum alloy liquid processing according to claim 1, characterized in that, The lifting mechanism (4) includes an installation box (401), and the installation box (401) is fixedly installed at the front end of the lifting seat (5). A second servo motor (402) is provided on the upper surface of the installation box (401). The power output end of the second servo motor (402) is drivingly connected to a first rotating shaft (403). A first bevel gear (404) is provided at the lower end of the first rotating shaft (403). The first bevel gear (404) is meshed and connected to a second bevel gear (405) at the rear side. A worm (406) is provided inside the second bevel gear (405). The lower end of the worm (406) is meshed and connected to a worm gear (407). The rear end of the worm gear (407) is meshed and connected to a vertical toothed plate (408), and the vertical toothed plate (408) is arranged on the front surface of the column (3).

4. An automatic refining device for aluminum alloy liquid processing according to claim 3, characterized in that, The front end of the worm (406) is rotatably installed inside the installation box (401). The worm gear (407) is rotatably installed inside the installation box (401) through a shaft rod. A vertical through groove is formed at the rear side of the installation box (401), and the vertical toothed plate (408) is arranged inside the vertical through groove.

5. An automatic refining device for aluminum alloy liquid processing according to claim 1, characterized in that, The horizontal moving mechanism (6) includes a third servo motor (601). The third servo motor (601) is arranged on the front surface of the lifting seat (5) through a motor seat. The power output end of the third servo motor (601) is drivingly connected to a second rotating shaft (602). A second spur gear (603) is provided at the rear end of the second rotating shaft (602). The second spur gear (603) is meshed and connected to a horizontal toothed plate (604) at the lower end. A horizontal moving plate (605) is provided at the lower end of the horizontal toothed plate (604), and the horizontal moving plate (605) and the horizontal toothed plate (604) are slidably mounted inside the lifting seat (5).

6. The automatic refining device for aluminum alloy liquid processing according to claim 5, wherein, A chute is formed inside the front end of the lifting seat (5). The second spur gear (603) is rotatably installed inside the chute, and the horizontal toothed plate (604) penetrates through the inside of the chute.

7. An automatic refining device for aluminum alloy liquid processing according to claim 5, characterized in that, A transfer mechanism (7) is provided at the right end of the lateral moving plate (605). The transfer mechanism (7) includes a mounting base (701), and the mounting base (701) is arranged at the right end of the lateral moving plate (605). A fourth servo motor (702) is provided at the left end of the upper surface of the mounting base (701). A first sprocket (703) is provided at the power output end of the fourth servo motor (702). The first sprocket (703) is connected to a second sprocket (704) through a toothed chain. A first rotating rod (705) is arranged in the middle of the second sprocket (704). The first rotating rod (705) is connected to a second rotating rod (706) through a transmission belt. The second rotating rod (706) is connected to a third rotating rod (707) through a transmission belt. The front ends of the first rotating rod (705), the second rotating rod (706) and the third rotating rod (707) are all rotatably installed inside the mounting base (701), and conveying rollers (708) are arranged on the circumferential surfaces of the front ends of the first rotating rod (705), the second rotating rod (706) and the third rotating rod (707).

8. An automatic refining device for aluminum alloy liquid processing according to claim 7, characterized in that, A nitrogen gas tank (10) is provided at the left front end of the surface of the base (1). The air outlet of the nitrogen gas tank (10) is connected to a nitrogen gas pipe (11). The upper end of the nitrogen gas pipe (11) is inserted inside the mounting base (701) and the lateral moving plate (605). The upper ends of the three conveying rollers (708) are all in contact with the lower surface of the nitrogen gas pipe (11). A U-shaped connecting plate (9) is provided on the right side of the front end of the lifting seat (5). A drag chain (8) is arranged inside the U-shaped connecting plate (9). The upper right side of the drag chain (8) is connected to the upper end of the mounting base (701).

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