A laser welding apparatus with defect self-detection

Abstract

The application discloses a kind of laser welding devices of defect self-detection, belong to laser welding field, the electric turntable top is equipped with driving disc, the driving disc is fixedly connected at gas analyzer body top, the driving disc inner wall is hinged with ratchet pawl, the fixed rod outer wall is rotatably connected with connecting ring, and the connecting ring inner wall is fixedly connected with connecting rod.By fixing steel pipe on the top of base, and starting electric turntable to drive welding gun body and gas analyzer body to rotate forward and backward, the welding operation and detection work of steel pipe can be accurately completed, after laser welding is completed, start air pump to inject gas into steel pipe, gas analyzer rotates and analyzes the gas composition of steel pipe, by driving disc driving ratchet pawl and ratchet clockwise rotation, plugging is carried out to both ends of steel pipe using hydraulic system, so as to guarantee the accuracy of gas analysis process, to detect whether there is defect and air leakage in steel pipe.

Description

Technical Field

[0001] The present application relates to the field of laser welding, and in particular to a laser welding device with self-defect detection. Background Art

[0002] Laser welding is a very common welding method. However, current laser welding equipment has low efficiency, lacks internal and external defect detection functions, has a low degree of automation, and places high labor intensity on operators.

[0003] Patent document CN112846509B discloses a laser welding device with self-detection of defects, comprising a first support plate, a laser welding machine mounted on the first support plate, material boxes on the left and right sides of the first support plate, a circular tube workpiece to be welded in the material boxes, a second support plate on the material boxes, a first piston at the lower end of the second support plate, an air supply mechanism next to the second support plate, a support frame below the first support plate, a first rotating shaft inserted on the support frame, a rotating mechanism on the support frame, fixed blocks on the left and right ends of the first rotating shaft, a first mounting plate on the fixed block, an annular sleeve on the first mounting plate, a second mounting plate on the annular sleeve, a wheel assembly on the second mounting plate, a first motor next to the wheel assembly, and a controller on the first support plate. The device has high welding efficiency, can detect whether there are through-cracks at the welding position of the end faces of two circular tube workpieces throughout the entire circle, and can perform coaxiality detection on welded semi-finished parts. It has a high degree of automation and reduces the labor intensity of workers.

[0004] Although the above-mentioned laser welding device can detect whether there are penetrating cracks at the entire welding position of the end faces of two circular tube workpieces, and can perform coaxiality detection on welded semi-finished parts, it has a high degree of automation and reduces the labor intensity of workers. However, the steel pipe is not sealed during use, resulting in a decrease in detection accuracy when using gas detection. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a laser welding device with self-determination of defects, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present application provides a defect self-detection laser welding device, comprising a base, a motorized turntable mounted on the top of the base, a support plate mounted on the top of the motorized turntable, a fixing rod fixedly connected to the front of the top of the support plate, a welding gun body and a gas analyzer body fixedly connected to the top of the motorized turntable, an air pump fixedly connected to the outer wall of the fixing rod, and a clamping assembly fixedly connected to the bottom of the fixing rod;

[0007] The top of the electric turntable is equipped with a driving disk, which is fixedly connected to the top of the gas analyzer body. The inner wall of the driving disk is hinged with a pawl. The outer wall of the fixed rod is rotatably connected to a connecting ring. The inner wall of the connecting ring is fixedly connected to a connecting rod. The bottom of the connecting rod is fixedly connected to a ratchet. The bottom of the fixed rod is fixedly connected to a connecting plate. The top of the connecting plate is fixedly connected to a hydraulic assembly. The bottom of the connecting plate is equipped with a first cleaning device for removing welding slag from the outer wall of the steel pipe, and the top of the base is equipped with a second cleaning device for cleaning welding slag on the top of the base.

[0008] Preferably, the hydraulic assembly includes a first hydraulic compartment, a piston at one end of the first hydraulic compartment is slidably connected to a first hydraulic rod, a connecting hose is fixedly connected to the back of the first hydraulic compartment, and a capsule is fixedly connected to the bottom of the connecting hose.

[0009] Preferably, the inner wall of the ratchet is provided with a sliding groove for the sliding of the first hydraulic rod, the outer wall of the first hydraulic rod is slidably connected to a rubber ring, the rubber ring is fixedly connected to the side of the first hydraulic compartment, and the ratchet and the pawl are engaged with each other.

[0010] Preferably, the first cleaning device includes a conical block, which is fixedly connected to the bottom of the ratchet, the front of the connecting plate is fixedly connected to a second hydraulic tank, the piston at one end inside the second hydraulic tank is slidingly connected to a second hydraulic rod, the piston at one end inside the second hydraulic tank is slidingly connected to a third hydraulic rod, and the bottom of the third hydraulic rod is fixedly connected to the first shovel.

[0011] Preferably, two groups of conical blocks are mirror-imaged at the bottom of the ratchet, and the second hydraulic rod is provided with an inclination angle for fitting the conical blocks.

[0012] Preferably, the second cleaning device includes a moving rod, which is fixedly connected to the bottom of the driving disk, a sleeve is fixedly connected to the bottom of the driving disk, a second scraper is slidably connected to the inner wall of the sleeve, a short rod is fixedly connected to the side of the second scraper, a vertical rod is fixedly connected to the top of the short rod, a vertical plate is fixedly connected to the top of the sleeve, and a spring is fixedly connected to the side of the vertical plate.

[0013] Preferably, a collecting groove is provided on the top of the base, and a collecting box is slidably connected to the inner wall of the collecting groove.

[0014] Preferably, a limiting groove for the sliding of the short rod is opened on the inner wall of the electric turntable, and one end of the spring away from the vertical plate is fixedly connected to the outer wall of the vertical rod.

[0015] The benefits of this application are:

[0016] 1. This application can accurately complete the welding operation and inspection of the steel pipe by fixing the steel pipe on the top of the base and starting the electric turntable to drive the welding gun body and the gas analyzer body to rotate forward and backward. After welding is completed, the air pump is started to inject gas into the steel pipe. The gas analyzer rotates and analyzes the gas composition of the steel pipe. The pawl and ratchet are driven by the drive disk to rotate clockwise, and the hydraulic system is used to seal the two ends of the steel pipe, thereby ensuring the accuracy of the gas analysis process to detect whether there are defects and leaks inside the steel pipe.

[0017] 2. This application drives the conical block through the driving plate, thereby compressing the second hydraulic rod, increasing the pressure in the second hydraulic chamber, driving the third hydraulic rod to descend and clean the welding slag at the welding point, ensuring that the welding slag can be effectively cleaned during the welding process, ensuring the welding quality and avoiding the welding slag affecting subsequent processing.

[0018] 3. This application uses a moving rod and a sleeve to drive a second scraper to clean the welding slag in the welding area. The cooperation of the short rod and the spring ensures that the scraper can effectively clean the welding slag on the top of the base, and collect the welding slag through the collection box, thereby improving the cleaning efficiency and avoiding the diffusion of welding slag, ensuring a clean and tidy cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a partial structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the bottom cross-sectional structure of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged structural diagram at C in the middle;

[0024] Figure 5 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0025] Figure 6 This is a schematic diagram of the enlarged structure of point A in Figure 5-1 of the present invention.

[0026] In the above figure,

[0027] 1. Electric turntable; 21. Driving plate; 22. Ratchet; 23. Connecting ring; 24. Connecting rod; 25. Ratchet; 26. Connecting plate; 27. First hydraulic rod; 28. Rubber ring; 29. ​​Connecting hose; 210. Capsule; 211. First hydraulic chamber; 3. First cleaning device; 31. Conical block; 32. Second hydraulic chamber; 33. Second hydraulic rod; 34. Third hydraulic rod; 35. First scraper; 4. Second cleaning device; 41. Moving rod; 42. Sleeve; 43. Second scraper; 44. Short rod; 45. Vertical rod; 46. Spring; 47. Vertical plate; 48. Collecting box; 5. Support plate; 6. Fixed rod; 7. Base; 8. Welding gun body; 9. Gas analyzer body; 10. Air pump; 11. Clamping assembly. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate to describe the embodiments of the present application here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0031] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Example 1: See Figures 1-6 This embodiment provides a laser welding device with defect self-detection, including a base 7, an electric turntable 1 is mounted on the top of the base 7, a support plate 5 is mounted on the top of the electric turntable 1, a fixing rod 6 is fixedly connected to the front of the top of the support plate 5, a welding gun body 8 and a gas analyzer body 9 are fixedly connected to the top of the electric turntable 1, an air pump 10 is fixedly connected to the outer wall of the fixing rod 6, a clamping assembly 11 is fixedly connected to the bottom of the fixing rod 6, the clamping assembly 11 includes an electric telescopic rod, the electric telescopic rod is fixedly connected to the inner wall of the connecting plate 26, and a clamping plate is fixedly connected to the side of the electric telescopic rod;

[0035] The electric turntable 1 is equipped with a drive disk 21 on the top, which is fixedly connected to the top of the gas analyzer body 9. A ratchet 22 is hinged on the inner wall of the drive disk 21. A connecting ring 23 is rotatably connected to the outer wall of the fixed rod 6. A connecting rod 24 is fixedly connected to the inner wall of the connecting ring 23. A ratchet 25 is fixedly connected to the bottom of the connecting rod 24. A connecting plate 26 is fixedly connected to the bottom of the fixed rod 6. A hydraulic assembly is fixedly connected to the top of the connecting plate 26. A first cleaning device 3 for removing welding slag from the outer wall of the steel pipe is equipped at the bottom of the connecting plate 26. A second cleaning device 4 for cleaning welding slag from the top of the base 7 is equipped on the top of the base 7. The electric turntable 1 is used to realize the rotation of the welding gun body 8 and the gas analyzer body 9 to meet the welding requirements at different positions. The air pump 10 on the fixed rod 6 can be used to input gas into the interior of the steel pipe for the gas analyzer body 9 to detect the interior of the steel pipe. The clamping assembly 11 is used to fix the workpiece to be welded. The drive disc 21 is connected to the gas analyzer body 9. A pawl 22 on its inner wall engages with a ratchet 25 at the bottom of the connecting rod 24. When the drive disc 21 rotates, the pawl 22 and ratchet 25 cooperate to drive the connecting rod 24 and the connecting ring 23 to rotate, thereby enabling the steel pipe to be inspected. A hydraulic assembly is mounted on top of the connecting plate 26 and is used to drive the first cleaning device 3 to remove welding slag from the outer wall of the steel pipe, while the second cleaning device 4 is used to clean welding slag from the top of the base 7, maintaining a clean working environment. The hydraulic assembly includes a first hydraulic chamber 211. A first hydraulic rod 27 is slidably connected to a piston at one end of the first hydraulic chamber 211. A connecting hose 29 is fixedly connected to the back of the first hydraulic chamber 211. A bladder 210 is fixedly connected to the bottom of the connecting hose 29. The hydraulic assembly operates by applying pressure to the first hydraulic rod 27, which is transferred through the connecting hose 29 into the first hydraulic chamber 211, causing the bladder 210 to expand. By controlling the pressure within the bladder 210, the two ends of the steel pipe are sealed. The inner wall of the ratchet 25 is provided with a groove for the sliding of the first hydraulic rod 27. The outer wall of the first hydraulic rod 27 is slidably connected to a rubber ring 28, which is fixedly attached to the side of the first hydraulic chamber 211. The ratchet 25 and the pawl 22 engage with each other. The groove design on the inner wall of the ratchet 25 allows the first hydraulic rod 27 to slide inside it, while the rubber ring 28 acts to slow the ejection speed of the first hydraulic rod 27 through friction, ensuring that the ejection speed of the first hydraulic rod 27 is slower during movement, allowing the bladder 210 to continuously expand. The mutual engagement of the ratchet 25 and the pawl 22 is the core operating principle of the ratchet mechanism. When the drive disc 21 drives the pawl 22 to rotate, the pawl 22 pushes the ratchet 25 to rotate unidirectionally. This unidirectional rotation feature allows certain operations during the welding process to be performed precisely according to predetermined steps.

[0036] When the above-mentioned device is used, two sets of clamping components 11 are used to fix two steel pipes, and the electric turntable 1 is started to drive the welding gun body 8 to rotate counterclockwise to weld the two steel pipes. During the rotation process, the electric turntable 1 drives the driving disc 21 to rotate counterclockwise, and the driving disc 21 drives the pawl 22 to slide on the tooth back of the ratchet 25. The pawl 22 will not drive the ratchet 25 to rotate. After the welding is completed, the air pump 10 is started to input gas into the inside of the steel pipe, and the electric turntable 1 is started to drive forward rotation. The electric turntable 1 drives the gas analyzer body 9 to rotate, and the gas analyzer body 9 drives the driving disc 21 to rotate forward. The driving disk 21 drives the pawl 22 to rotate, and the pawl 22 drives the ratchet 25 to rotate clockwise. The rotation of the ratchet 25 squeezes the first hydraulic rod 27 through the slide groove, and the first hydraulic rod 27 moves to the left. The internal pressure of the first hydraulic tank 211, the connecting hose 29, and the bladder 210 increases, causing the bladder 210 to expand and seal the upper and lower ends of the steel pipe. Since the first hydraulic rod 27 slides on the inner wall of the rubber ring 28, the first hydraulic rod 27 will not quickly return to the slide groove starting from the inner wall of the ratchet 25 when the ratchet 25 continues to rotate clockwise, and the welding edge of the steel pipe is detected by the gas analyzer body 9.

[0037] Example 2: See Figures 1-6 Based on the first embodiment, the first cleaning device 3 includes a conical block 31, which is fixedly connected to the bottom of the ratchet 25. A second hydraulic chamber 32 is fixedly connected to the front of the connecting plate 26. A second hydraulic rod 33 is slidably connected to a piston at one end of the second hydraulic chamber 32. A third hydraulic rod 34 is slidably connected to a piston at one end of the second hydraulic chamber 32. A first scraper 35 is fixedly connected to the bottom of the third hydraulic rod 34. The working principle of the first cleaning device 3 is to use the telescopic movement of the second hydraulic rod 33 and the third hydraulic rod 34 in the second hydraulic chamber 32 to clean the welding slag. When the second hydraulic rod 33 and the third hydraulic rod 34 extend, they push the first scraper 35 into contact with the outer wall of the steel pipe, thereby scraping off the welding slag. The conical block 31 is fixedly connected to the bottom of the ratchet 25. Its design allows the conical block 31 to align with the inclination of the second hydraulic rod 33 during the rotation of the ratchet 25, thereby driving the second hydraulic rod 33 to perform precise telescopic movement, achieving efficient cleaning of welding slag. Two sets of mirror-image tapered blocks 31 are located on the bottom of the ratchet 25. The second hydraulic rod 33 is angled to fit the tapered blocks 31. These mirror-image tapered blocks 31 on the bottom of the ratchet 25 work in conjunction with the angled design of the second hydraulic rod 33, enabling the second hydraulic rod 33 to extend and retract more smoothly under the influence of the ratchet 25. This design not only improves cleaning efficiency but also ensures the stability and reliability of the first cleaning device 3 during operation.

[0038] The above device is used in specific, through the drive plate 21 counterclockwise rotation when the bottom cone block 31 clockwise rotation, cone block 31 rotation to the front when extruding the second hydraulic rod 33, the second hydraulic rod 33 to the back, the second hydraulic chamber 32 inside pressure increases, the second hydraulic chamber 32 inside pressure increases, the second hydraulic chamber 32 drive third hydraulic rod 34 down, third hydraulic rod 34 drive first shovel 35 down, the slag of the welded joint of steel pipe is cleaned.

[0039] Example three: see Figures 1-6 , on the basis of example one, the second cleaning device 4 includes moving rod 41, moving rod 41 fixedly connected in the bottom of the drive plate 21, the bottom of the drive plate 21 is fixedly connected with sleeve 42, the inner wall of sleeve 42 is slidingly connected with second shovel 43, the side of second shovel 43 is fixedly connected with short rod 44, the top of short rod 44 is fixedly connected with vertical rod 45, the top of sleeve 42 is fixedly connected with vertical plate 47, the side of vertical plate 47 is fixedly connected with spring 46, the working principle of second cleaning device 4 is to use the rotation of drive plate 21 to drive moving rod 41 and sleeve 42 movement. The second shovel 43 slidingly connected with the inner wall of sleeve 42 can rotate flexibly under the action of spring 46. When the drive plate 21 rotates, the second shovel 43 will slide left and right in the sleeve 42, thereby scraping off the slag on the top of base 7. The design of short rod 44 and vertical rod 45 is used to support and guide the second shovel 43, ensuring the stability of its movement. The cooperation of vertical plate 47 and spring 46 provides the necessary elastic force, so that the second shovel 43 can closely fit the surface of base 7, realizing efficient slag cleaning. The top of base 7 is provided with a collecting groove, and the inner wall of the collecting groove is slidingly connected with a collecting box 48. The collecting groove and the slidingly connected collecting box 48 are used to collect the slag cleaned. During the working process of second cleaning device 4, the scraped slag will fall into the collecting groove and finally into the collecting box 48, not only keeping the working environment clean, but also facilitating the centralized treatment of slag, improving the environmental performance and working efficiency of the welding device. The inner wall of electric rotating disc 1 is provided with a limiting groove for the sliding of short rod 44, and the end of spring 46 away from vertical plate 47 is fixedly connected with the outer wall of vertical rod 45. The limiting groove in the inner wall of electric rotating disc 1 is used to limit the sliding path of short rod 44, ensuring the stability and accuracy of second cleaning device 4 during the working process. The end of spring 46 away from vertical plate 47 is fixedly connected with the outer wall of vertical rod 45, which makes spring 46 provide stable elastic force, so that second shovel 43 reciprocates, realizing the cutting effect, and closely fitting the surface of base 7, improving the cleaning effect. Through the cooperation of limiting groove and spring 46, second cleaning device 4 can more flexibly adapt to different cleaning needs, ensuring the efficient operation of the welding device.

[0040] When the above-mentioned equipment is in use, the driving disk 21 drives the moving rod 41 to rotate, the moving rod 41 drives the sleeve 42 to rotate, and the sleeve 42 drives the second scraper 43 to rotate. During the rotation, the second scraper 43 drives the short rod 44 to slide on the inner wall of the electric turntable 1. When the short rod 44 slides to the limiting groove on the inner wall of the electric turntable 1, the spring 46 will drive the vertical rod 45 to move outward, and the vertical rod 45 drives the short rod 44 to move outward. The short rod 44 drives the second scraper 43 to reciprocate to clean the welding slag on the top of the base 7, and push the cut welding slag into the collection box 48 to collect the welding slag.

[0041] When the above-mentioned device is used in a specific manner, the above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A laser welding device with self-defect detection, comprising a base, a motorized turntable mounted on top of the base, a support plate mounted on top of the motorized turntable, a fixing rod fixedly connected to the front of the top of the support plate, a welding gun body and a gas analyzer body fixedly connected to the top of the motorized turntable, an air pump fixedly connected to the outer wall of the fixing rod, and a clamping assembly fixedly connected to the bottom of the fixing rod; It is characterized by: The top of the electric turntable is equipped with a driving disk, which is fixedly connected to the top of the gas analyzer body. A pawl is hinged on the inner wall of the driving disk. The outer wall of the fixed rod is rotatably connected to a connecting ring. The inner wall of the connecting ring is fixedly connected to a connecting rod. The bottom of the connecting rod is fixedly connected to a ratchet. The bottom of the fixed rod is fixedly connected to a connecting plate. The top of the connecting plate is fixedly connected to a hydraulic assembly. The bottom of the connecting plate is equipped with a first cleaning device for removing welding slag from the outer wall of the steel pipe, and the top of the base is equipped with a second cleaning device for cleaning welding slag on the top of the base; The hydraulic assembly includes a first hydraulic compartment, a first hydraulic rod is slidably connected to a piston at one end of the first hydraulic compartment, a connecting hose is fixedly connected to the back of the first hydraulic compartment, and a capsule is fixedly connected to the bottom of the connecting hose; The inner wall of the ratchet is provided with a sliding groove for the sliding of the first hydraulic rod, the outer wall of the first hydraulic rod is slidably connected to a rubber ring, the rubber ring is fixedly connected to the side of the first hydraulic compartment, and the ratchet and the pawl are engaged with each other.

2. A defect self-detection laser welding device according to claim 1, characterized in that: The first cleaning device includes a conical block, which is fixedly connected to the bottom of the ratchet. The front of the connecting plate is fixedly connected to a second hydraulic tank. A second hydraulic rod is slidably connected to a piston at one end of the second hydraulic tank. A third hydraulic rod is slidably connected to a piston at one end of the second hydraulic tank. The bottom of the third hydraulic rod is fixedly connected to a first shovel.

3. A defect self-detection laser welding device according to claim 2, characterized in that: The bottom of the ratchet is mirror-imaged with two groups of conical blocks, and the second hydraulic rod is provided with an inclination angle for fitting the conical blocks.

4. The defect self-detection laser welding device according to claim 1, characterized in that: The second cleaning device includes a moving rod, which is fixedly connected to the bottom of the driving disk, a sleeve is fixedly connected to the bottom of the driving disk, a second scraper is slidably connected to the inner wall of the sleeve, a short rod is fixedly connected to the side of the second scraper, a vertical rod is fixedly connected to the top of the short rod, a vertical plate is fixedly connected to the top of the sleeve, and a spring is fixedly connected to the side of the vertical plate.

5. The defect self-detection laser welding device according to claim 4, characterized in that: A collecting groove is provided on the top of the base, and a collecting box is slidably connected to the inner wall of the collecting groove.

6. The defect self-detection laser welding device according to claim 5, characterized in that: A limiting groove for the sliding of the short rod is provided on the inner wall of the electric turntable, and one end of the spring away from the vertical plate is fixedly connected to the outer wall of the vertical rod.

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