A boring finishing device with a clamping extension function
By integrating detection and cleaning components into the boring equipment, the problems of boring tool damage detection and chip removal are solved, achieving high precision and cleanliness in the boring process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-03
- Publication Date
- 2026-04-10
AI Technical Summary
Existing boring equipment cannot detect the damage status of boring tools in real time, and the debris generated during boring is difficult to clean, resulting in a dirty working area and difficulty in guaranteeing boring accuracy.
A boring finishing device with an extended clamping function was designed, which integrates detection and cleaning components. It can automatically detect the damage status of the boring tool after boring and clean the chips by combining an ion air blade and an elliptical aluminum tube.
It enables real-time detection of boring tools, ensuring machining accuracy, preventing finished product tolerances, and effectively cleaning up debris to keep the work area clean.
Smart Images

Figure CN120696457B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the boring technical field, specifically to a boring finishing device with clamping extension function. BACKGROUND
[0002] In the machining of high-precision holes or finishing of multiple holes completed by one positioning, boring machining equipment is generally used. In addition, boring machining equipment can also be used for machining other machined surfaces related to hole finishing. It is one of the mechanical equipment commonly used in mechanical machining. In the process of manufacturing pressure vessels, the surface of the workpiece plate is often bored.
[0003] However, the existing boring equipment cannot detect the boring tool after each work when boring the workpiece or plate, so it cannot know whether the current boring tool is damaged or worn. The boring tool can only be judged by manual observation. This method is troublesome and not accurate. At the same time, when boring the workpiece or plate, the general boring equipment will generate a lot of debris. The general equipment does not have the function of cleaning and recycling the debris, so the working area of the entire boring equipment will be dirty. SUMMARY
[0004] The purpose of the present application is to provide a boring finishing device with clamping extension function to solve the problems in the prior art.
[0005] To achieve the above purpose, the present application provides the following technical scheme: a boring finishing device with clamping extension function, comprising a boring equipment main body and a controller, the boring equipment main body comprises a base, a driving assembly, a clamping platform and a boring assembly are arranged above the base, the driving assembly and the clamping platform cooperate with each other, the boring assembly output end and the clamping platform cooperate with each other, the boring equipment main body inside both sides are respectively provided with cleaning assembly, the cleaning assembly can clean the debris, the boring assembly bottom is provided with detection assembly, the detection assembly can detect the boring tool.
[0006] Further, the driving assembly comprises a plurality of driving grooves, a plurality of brushes are arranged on the driving grooves, the brushes can block the debris, a transmission rod is arranged in each driving groove, a driven pulley is arranged outside each driving groove, a main pulley is arranged on the base, the main pulley is driven by a motor, a belt is connected between the main pulley and the plurality of driven pulleys, the driving grooves comprise a main driving groove and two groups of driven grooves, the length of the main driving groove is less than that of the driven grooves, the boring assembly and the detection assembly are respectively located between the two groups of driven grooves.
[0007] Further, the clamping platform is provided with a clamping assembly, the clamping assembly comprises a mounting block, the mounting block is provided with clamping plates on both sides, the clamping plates are provided with rubber plates on one side, the clamping plates are driven by a plurality of air cylinders, and the mounting block can clamp materials.
[0008] Further, the boring assembly comprises a support plate, the support plate is provided with support blocks, the support blocks are provided with a plurality of adjusting air cylinders at the bottom, the bottom output ends of the adjusting air cylinders are provided with support platforms, the support platforms are provided with boring motors, the boring motors are provided with limit clamps at the output ends, the limit clamps are provided with boring tools between them, and the boring tools can bore materials.
[0009] Further, a plurality of limit air cylinders are installed outside the limit clamps, a plurality of arc-shaped plates are installed inside the limit clamps, each limit air cylinder is connected with each arc-shaped plate, and the arc-shaped plates can clamp the boring tools.
[0010] Further, the detection assembly comprises a detection mold, the detection mold is installed between the driving assembly and the boring assembly, the detection groove cooperates with the boring tool, a fixed plate is installed above the detection groove, and the detection mold and the fixed plate can detect the boring tool.
[0011] Further, arc-shaped detection plates are arranged inside the detection groove, one side of the arc-shaped detection plates cooperates with the boring tool, the other side of the arc-shaped detection plates is provided with pressure sensing rods and a plurality of return springs, a sound wave generator and a receiver are installed at the bottom of the fixed plate, and the sound wave generator can detect the sound wave of the boring tool.
[0012] Further, a plurality of installation grooves are formed in the two sides of the boring equipment body, the cleaning assembly is installed in the installation grooves, the cleaning assembly comprises a group of ion wind blades and two groups of elliptical aluminum pipes, the ion wind blades and the two groups of elliptical aluminum pipes are installed in the installation grooves, the height of the air inlet of the installation groove is higher than that of the air outlet, the installation groove is inclined, the ion wind blades are installed at one end of the air inlet of the installation groove, and the two groups of elliptical aluminum pipes are installed at one end of the air outlet of the installation groove.
[0013] Further, the ion wind blades are connected with positive current through the controller, the two groups of elliptical aluminum pipes are connected with negative current through the controller, and the output end of the ion wind blades is provided with equidistant sawtooth-shaped notches.
[0014] Further, the controller is arranged at the bottom of the boring equipment body, and a control panel is installed in front of the boring equipment body and connected with the controller.
[0015] Compared with the prior art, the boring equipment has the advantages that:
[0016] 1、Thus, the device can effectively bore the workpiece or plate material during use, and after each boring, the device detects the boring tool through the detection assembly, thereby detecting whether the current boring tool is damaged, so as to ensure the integrity of the workpiece output and prevent the workpiece from having a tolerance;
[0017] 2、The detection assembly of the device can detect the boring tool during use, detect the state of the boring tool after each work, and thereby ensure that the boring tool is not damaged, and the detection assembly needs to first move the boring tool to fall into the detection mold during specific use, and after the boring tool falls to the bottom of the detection groove, the boring motor will drive the boring tool to slowly rotate, thereby detecting the boring tool and determining whether the boring tool has a large loss, and the device fixing plate can also detect the boring tool through the accessories installed at the bottom, thereby more comprehensively checking the boring tool and determining the state of the boring tool from multiple directions;
[0018] 3、The cleaning assembly of the device can clean the debris on the clamping platform during use, and the cleaning assembly can also cool the working area during boring, and when the ion wind blade and the two groups of oval aluminum pipes are powered during specific use, high voltage will break through the air to form charged ions, and the charged ions will move from the strong pole to the weak pole to form an ion wind, and the ion wind generated will clean the debris on the clamping platform, and because the installation groove is inclined, the cleaning assembly is also installed in the shape of the installation groove, and thereby the direction of the cleaning assembly is mainly towards the clamping platform, thereby accurately cleaning the debris on the clamping platform. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a structure schematic view of the whole of the present application;
[0020] Figure 2 It is a structure schematic view of the whole of the present application;
[0021] Figure 3 It is a structure schematic view of the whole of the present application;
[0022] Figure 4 It is a structure schematic view of the whole of the present application;
[0023] Figure 5 It is a structure schematic view of the whole of the present application;
[0024] Figure 6 It is an enlarged schematic view of "A" in the present application; Figure 2
[0025] Figure 7 For the present invention Figure 2 An enlarged view of section "B" in the middle;
[0026] Figure 8 For the present invention Figure 2 An enlarged view of point "C" in the middle;
[0027] Figure 9 For the present invention Figure 4 An enlarged diagram of the "D" in the middle.
[0028] In the diagram: 1. Main body of the boring equipment; 11. Base; 12. Clamping platform; 13. Mounting slot; 2. Drive assembly; 21. Drive slot; 211. Transmission rod; 22. Driven pulley; 23. Main pulley; 3. Boring assembly; 31. Support plate; 32. Support block; 33. Adjusting cylinder; 34. Support platform; 35. Boring motor; 36. Limiting fixture; 361. Limiting cylinder; 362. Arc plate; 4. Cleaning assembly; 41. Ion air blade; 42. Oval aluminum tube; 5. Detection assembly; 51. Detection mold; 52. Detection slot; 53. Fixing plate; 54. Arc detection plate; 55. Pressure sensing rod; 56. Return spring; 6. Clamping assembly; 61. Mounting block; 62. Clamping plate; 7. Controller. Detailed Implementation
[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.
[0030] Example: Figures 1-9 As shown, the present invention provides a boring finishing device with a clamping extension function, including a boring equipment body 1 and a controller 7. The boring equipment body 1 includes a base 11, and a drive component 2, a clamping platform 12 and a boring component 3 are arranged on the base 11. The drive component 2 and the clamping platform 12 cooperate with each other. The output end of the boring component 3 cooperates with the clamping platform 12. Cleaning components 4 are respectively arranged on both sides inside the boring equipment body 1. The cleaning components 4 can clean up the chips. A detection component 5 is arranged at the bottom of the boring component 3. The detection component 5 can detect the boring tool.
[0031] The device is used, first need to put the boring material on the clamping platform 12, through the clamping platform 12 to boring material clamping limit, prevent material in the process of being boring, the phenomenon of damage tool or machine, when the material is limited on the clamping platform 12, the device can close the hatch, and start boring equipment main body 1, when starting the whole boring equipment main body 1, the internal equipment will work according to the program, first drive assembly 2 will drive the clamping platform 12 to move, make the clamping platform 12 can move to the appropriate position, so that boring assembly 3 can boring material, while boring assembly 3 again to material boring process, boring assembly 3 will also be according to the program to adjust the position, in order to better boring material, while boring assembly 3 again to material processing engineering, the cleaning assembly 4 in the device can always clean the processing area, but also can play a certain cooling function, after the device completes boring, the detection assembly 5 of the device will detect boring tool, and then prevent the tool from being damaged, resulting in the tolerance of finished product, and the detection assembly 5 of the device checks the boring tool, when the boring tool is damaged, it can be warned, and the staff is reminded to replace the boring tool, so as to avoid the output of defective products.
[0032] As shown in Figures 1-3 and Figure 6 , in this embodiment, specifically, the drive assembly includes a plurality of drive grooves 21, a plurality of brushes are arranged on the drive grooves 21, the brushes can block the debris, each of the drive grooves 21 is respectively provided with a transmission rod 211, each of the drive grooves 21 is respectively provided with a slave pulley 22, the base 11 is provided with a master pulley 23, the master pulley 23 is driven by a motor, the master pulley 23 and the plurality of slave pulleys 22 are connected by a belt, the drive groove 21 includes a main drive groove and two slave drive grooves, the length of the main drive groove is less than that of the slave drive groove, the boring assembly 3 and the detection assembly 5 are respectively located between the two slave drive grooves;
[0033] The drive assembly 2 of the device can drive the clamping platform 12 to move when in use, and the drive assembly 2 drives the clamping platform 12 to move according to the program, specifically, the motor can drive the main pulley 23 to rotate, and because the master pulley 23 and the plurality of slave pulleys 22 are installed with a belt, when the master pulley 23 rotates, the plurality of slave pulleys 22 will rotate, and when the pulley rotates, the transmission rod 211 will rotate, because the transmission rod 211 cooperates with the clamping platform 12, it can drive the support platform 34 to move, and the drive groove 21 of the device is provided with a brush above, which can block the debris and prevent the debris from entering the drive groove 21, so as to avoid the influence of the clamping platform 12.
[0034] As Figures 1-2 shown in the embodiment, specifically, the clamping platform 12 is provided with a clamping assembly 6, which includes a mounting block 61, both sides of the mounting block 61 are provided with clamping plates 62, the clamping plates 62 are clamped with rubber plates, the clamping plates 62 are driven by multiple groups of air cylinders, and the mounting block 61 can clamp materials above;
[0035] The clamping platform 12 of the device can clamp the boring material through the clamping assembly 6 above. Specifically, when the boring material is placed on the mounting block 61, the air cylinder drives the clamping plate 62 to tighten, thereby clamping the boring material through the clamping plate 62. Because the clamping plate 62 clamps the boring material with a rubber plate, the rubber plate can also increase the friction of the boring material, thereby more stably clamping the boring material, so that the boring assembly 3 can more firmly fix the boring material when boring.
[0036] As Figure 2 and Figure 7 shown in the embodiment, specifically, the boring assembly 3 includes a support plate 31, the support plate 31 is installed with a support block 32, the bottom of the support block 32 is installed with multiple groups of adjusting air cylinders 33, the bottom output end of the multiple groups of adjusting air cylinders 33 is installed with a support platform 34, the support platform 34 is provided with a boring motor 35, the output end of the boring motor 35 is installed with a limiting clamp 36, the boring cutter is installed between the limiting clamps 36, and the boring cutter can bore the material;
[0037] The boring assembly 3 of the device can bore the boring material when in use. During the processing of the material, the boring assembly 3 can automatically fine-tune according to the programmed program of the machine, so as to bore the material. When the boring assembly 3 is in use, the support block 32 can be adjusted through the groove and limiting rod on the support plate 31, so that the support block 32 can translate left and right on the support plate 31. The adjusting air cylinder 33 at the bottom of the support block 32 drives the support platform 34 to stretch and retract, thereby driving the boring motor 35 connected with the support platform 34. The limiting clamp 36 is arranged at the bottom of the boring motor 35, which can clamp the boring cutter through the limiting clamp 36. When the boring motor 35 rotates, it can stably drive the boring cutter to rotate, thereby processing the boring material, and improving the stability during boring.
[0038] As Figure 5As shown, in this embodiment, specifically, the limiting fixture 36 is externally mounted with multiple sets of limiting cylinders 361, and the limiting fixture 36 is internally mounted with multiple sets of arc-shaped plates 362. Each set of limiting cylinders 361 is connected with each arc-shaped plate 362, and the arc-shaped plate 362 can clamp the boring tool.
[0039] The limiting fixture 36 of the device can clamp the boring tool and limit the position of the boring tool during use. Specifically, during use, the boring tool needs to be placed into the limiting fixture 36 first, and then the limiting cylinders 361 are started to push the arc-shaped plates 362, so that the boring tool is clamped by the multiple sets of arc-shaped plates 362, thereby firmly clamping the boring tool.
[0040] As shown in Figure 2 , Figure 4 and Figure 9 , in this embodiment, specifically, the detection assembly 5 includes a detection mold 51, which is installed between the driving assembly 2 and the boring assembly 3. The detection groove 52 cooperates with the boring tool. The detection mold 51 and the fixed plate 53 are both capable of detecting the boring tool.
[0041] The detection assembly 5 of the device can detect the boring tool and detect the state of the boring tool after each work, thereby ensuring that the boring tool is not damaged. During specific use of the detection assembly 5, the boring tool needs to be moved to fall into the detection mold 51 first. When the boring tool falls to the bottom of the detection groove 52, the boring motor 35 will drive the boring tool to rotate slowly, thereby detecting the boring tool and determining whether the boring tool has a large loss. Meanwhile, the fixed plate 53 of the device can also detect the boring tool through the accessories installed at the bottom, thereby more comprehensively checking the boring tool and determining the state of the boring tool from multiple directions.
[0042] As shown in Figure 4 and Figure 9 , in this embodiment, specifically, the detection groove 52 is internally provided with an arc-shaped detection plate 54. One side of the arc-shaped detection plate 54 cooperates with the boring tool, and the other side of the arc-shaped detection plate 54 is installed with a pressure sensing rod 55 and multiple sets of return springs 56. The fixed plate 53 is installed with a sound wave generator and a receiver at the bottom. The sound wave generator can detect the sound wave of the boring tool.
[0043] When the boring tool moves to the inside of the detection groove 52, the boring motor 35 drives the boring tool to rotate. When the boring tool contacts the arc-shaped detection plate 54, the boring tool extrudes the arc-shaped detection plate 54, and the arc-shaped detection plate 54 extrudes the pressure sensing rod 55. The controller 7 compares the current value with the value detected when the boring tool is in good condition, thereby judging the state of the boring tool. Meanwhile, the acoustic generator at the bottom of the fixed plate 53 emits sound waves to the boring tool. When the sound waves are reflected back to the receiver, the spectrum formed by the receiver is compared with the initial spectrum, thereby detecting the boring tool from two aspects.
[0044] As shown in Figures 1-3 In this embodiment, specifically, a plurality of installation grooves 13 are formed on both sides of the boring equipment body 1, the cleaning assembly 4 is installed in the installation grooves 13, the cleaning assembly 4 includes a group of ion wind blades 41 and two groups of elliptical aluminum pipes 42, the ion wind blades 41 and the two groups of elliptical aluminum pipes 42 are installed in the installation grooves 13, the height of the air inlet of the installation groove 13 is higher than that of the air outlet, the installation groove 13 is inclined, the ion wind blades 41 are installed at one end of the air inlet of the installation groove 13, and the two groups of elliptical aluminum pipes 42 are installed at one end of the air outlet of the installation groove 13.
[0045] In use, the cleaning assembly 4 of the device can clean the debris on the clamping platform 12, and can also cool the working area during boring. Specifically, when the ion wind blades 41 and the two groups of elliptical aluminum pipes 42 are electrified, high voltage will break through the air to form charged ions, and the charged ions will move from the strong pole to the weak pole to form ion wind. The ion wind generated can clean the debris on the clamping platform 12. Because the installation groove 13 is inclined, and the cleaning assembly 4 is also installed in the shape of the installation groove 13, the direction of the cleaning assembly 4 is mainly towards the clamping platform 12, thereby accurately cleaning the debris on the clamping platform 12.
[0046] As shown in Figures 1-3 and Figure 8 In this embodiment, specifically, the ion wind blades 41 are connected to positive current through the controller 7, the two groups of elliptical aluminum pipes 42 are connected to negative current through the controller 7, and the output end of the ion wind blades 41 is provided with equidistant sawtooth-shaped notches.
[0047] The ion wind blade 41 of the device is connected with positive current, and the two groups of oval aluminum tubes 42 are connected with aluminum tubes, and then after being electrified, high voltage will break the air to form charged ions, and the charged ions will move from the strong pole to the weak pole to form ion wind. The reason why the ion wind blade 41 is provided with equidistant sawtooth-shaped notches is to increase the discharge area of the ion wind blade 41, increase the discharge area, and indirectly increase a certain amount of ion wind.
[0048] As shown in Figure 1 In this embodiment, the controller 7 is arranged at the bottom of the boring equipment body 1, the control panel is arranged at the front of the boring equipment body 1, and the control panel is connected with the controller 7.
[0049] When the boring equipment body 1 is used, the boring equipment body 1 and its accessories can be controlled and monitored through the controller 7. Because the control panel on the boring equipment body 1 is connected with the controller 7, the staff can control the boring equipment body 1 through the control panel.
[0050] Working principle: when the device is used, the boring material is first placed above the clamping platform 12, and the clamping platform 12 clamps the boring material to prevent damage to the tool or machine during boring. When the material is limited on the clamping platform 12, the device can close the hatch and start the boring equipment body 1. When the entire boring equipment body 1 is started, the internal devices will work according to the program. First, the driving assembly 2 drives the clamping platform 12 to move, so that the clamping platform 12 can move to the appropriate position to facilitate the boring assembly 3 to bore the material. At the same time, the boring assembly 3 will automatically adjust the position according to the program during the boring process of the material, so as to better bore the material. At the same time, the cleaning assembly 4 in the device can clean the processing area and also has a certain cooling function. After the boring of the device is completed, the detection assembly 5 of the device detects the boring tool to prevent damage to the tool and cause the tolerance of the finished product. The boring tool is checked by the detection assembly 5 of the device, and when the boring tool is damaged, a warning can be given to remind the staff to replace the boring tool, so as to avoid the production of defective products.
[0051] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.
Claims
1. A boring finishing device with a clamping function, comprising a boring device main body (1) and a controller (7), characterized in that: The boring equipment body (1) includes a base (11), a driving assembly (2), a clamping platform (12) and a boring assembly (3) are arranged above the base (11), the driving assembly (2) and the clamping platform (12) are matched with each other, the output end of the boring assembly (3) is matched with the clamping platform (12), the boring equipment body (1) is provided with cleaning assemblies (4) on both sides inside, the cleaning assemblies (4) can clean the debris, the boring assembly (3) is provided with a detection assembly (5) at the bottom, and the detection assembly (5) can detect the boring tool; The driving assembly includes a plurality of driving grooves (21), a plurality of brushes are arranged on the driving grooves (21), the brushes can block the debris, a transmission rod (211) is arranged in each of the driving grooves (21), a driven pulley (22) is arranged outside each of the driving grooves (21), a main pulley (23) is arranged on the base (11), the main pulley (23) is driven by a motor, a belt is connected between the main pulley (23) and the plurality of driven pulleys (22), the driving grooves (21) include a main driving groove and two slave driving grooves, the length of the main driving groove is less than that of the slave driving grooves, and the boring assembly (3) and the detection assembly (5) are located between the two slave driving grooves; The boring assembly (3) includes a support plate (31), a support block (32) is installed on the support plate (31), a plurality of adjusting cylinders (33) are installed at the bottom of the support block (32), a support platform (34) is installed at the bottom output end of the plurality of adjusting cylinders (33), a boring motor (35) is arranged on the support platform (34), a limiting clamp (36) is installed at the output end of the boring motor (35), a boring tool is installed between the limiting clamps (36), and the boring tool can bore the material; A plurality of limiting cylinders (361) are installed outside the limiting clamps (36), a plurality of arc-shaped plates (362) are installed inside the limiting clamps (36), each limiting cylinder (361) is connected with each arc-shaped plate (362), and the arc-shaped plates (362) can clamp the boring tool; The detection assembly (5) includes a detection mold (51), the detection mold (51) is installed between the driving assembly (2) and the boring assembly (3), a detection groove (52) is installed in the detection mold (51), the detection groove (52) is matched with the boring tool, a fixed plate (53) is installed above the detection groove (52), and the detection mold (51) and the fixed plate (53) can detect the boring tool; An arc-shaped detection plate (54) is arranged in the detection groove (52), one side of the arc-shaped detection plate (54) is matched with the boring tool, the other side of the arc-shaped detection plate (54) is provided with a pressure sensing rod (55) and a plurality of reset springs (56), a sound wave generator and a receiver are installed at the bottom of the fixed plate (53), and the sound wave generator can detect the sound wave of the boring tool.
2. The boring finishing device with a clamping extension function according to claim 1, characterized in that: The clamping platform (12) is provided with a clamping assembly (6), the clamping assembly includes a mounting block (61), the mounting block (61) is provided with a clamping plate (62) on both sides, the clamping plate (62) clamps a rubber plate provided on one side, the clamping plate (62) is driven by a plurality of groups of air cylinders, and the mounting block (61) can clamp materials above.
3. The boring finishing device with a clamping extension function according to claim 1, characterized in that: The boring equipment body (1) is provided with a plurality of installation grooves (13) on both sides, the cleaning assembly (4) is installed in the installation groove (13), the cleaning assembly (4) includes a group of ion wind blades (41) and two groups of elliptical aluminum pipes (42), the ion wind blades (41) and the two groups of elliptical aluminum pipes (42) are installed in the installation groove (13), the installation groove (13) is inclined, the ion wind blades (41) are installed at one end of the air inlet of the installation groove (13), and the two groups of elliptical aluminum pipes (42) are installed at one end of the air outlet of the installation groove (13).
4. The boring finishing device with a function of extending a clamp according to claim 3, characterized in that: The ion wind blades (41) are connected with positive current through the controller (7), the two groups of elliptical aluminum pipes (42) are connected with negative current through the controller (7), and the ion wind blades (41) are provided with equidistant sawtooth-shaped notches at the output end.
5. The boring finishing device with a function of extending a clamp according to claim 4, characterized in that: The boring equipment body (1) is provided with the controller (7) at the bottom, a control panel is installed in front of the boring equipment body (1), and the control panel is connected with the controller (7).
Citation Information
Patent Citations
Stainless steel tube boring device
CN117483842A
Clamping device capable of effectively reducing turning stress
CN222471546U