Brake disc welding machine

CN224855203UActive Publication Date: 2026-10-16GUANGDONG FANGYING AUTO COMPONENT IND CO LTD
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Patent Information

Application Number
CN202522445846.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-18
Publication Date
2026-10-16
Estimated Expiration
2035-11-18

AI Technical Summary

Technical Problem

[0002]现有的刹车盘包括面板和腹板,面板的上端面和腹板的下端面都呈弧状,腹板置于面板的上端面上,现有是通过人手的方式将腹板焊接于面板的上端面上,导致每次腹板放置的位置都不一样,以及采用人手焊接的方式,焊接精度差和效率慢

Benefits of technology

1、通过设置有旋转座、第一驱动装置和位于旋转座前方或后方的焊枪,在旋转座的工装模具安装孔内安装下模和工装上模滑块组件,面板可放置在下模上进行固定,腹板则能固定在工装上模滑块组件的底部,第一驱动装置能够驱动工装上模滑块组件移动,使工装上模滑块组件上的腹板保持与下模上的面板抵接;由于旋转座能够转动,当驱动旋转座转动时,焊枪可以对腹板与面板抵接处的整条缝隙进行焊接,刹车盘焊接专机采用上述结构实现机器焊接操作,保证了每次腹板放置的位置都一样,避免人手焊接,提高焊接精度和焊接效率,以及采用上述结构实现机器旋转同步焊接操作,相当于每点焊接都属平焊,不存在爬坡焊接导致流焊现象,保证每点焊接焊缝的熔深,减少废品或次品。

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Abstract

The utility model discloses a kind of brake disc welding special machines, including rotating frame, rotating seat, fixed component and welding torch, rotating seat is rotatably installed on rotating frame, rotating shaft of rotating seat is parallel with horizontal plane, rotating seat has tooling mold mounting hole;Fixed component includes lower mould, tooling upper die slider block component and first driving device, lower mould is installed at the bottom inside tooling mold mounting hole, panel is detachably installed on the upper end surface of lower mould, tooling upper die slider block component is movably installed in tooling mold mounting hole, web is detachably installed at the bottom of tooling upper die slider block component;Welding torch is movably installed in front or rear of rotating seat;The utility model is provided with rotating seat, first driving device and welding torch located in front or rear of rotating seat, install lower mould and tooling upper die slider block component in the tooling mold mounting hole of rotating seat, face realizes machine welding operation, effectively improves welding precision.
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Description

Technical Field

[0001] This utility model relates to the field of welding equipment, and in particular to a special machine for welding brake discs. Background Technology

[0002] The existing brake disc includes a faceplate and a web. The upper end face of the faceplate and the lower end face of the web are both arc-shaped. The web is placed on the upper end face of the faceplate. Currently, the web is welded to the upper end face of the faceplate by hand, which results in the web being placed in a different position each time. In addition, the manual welding method has poor welding accuracy and slow efficiency. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a special machine for welding brake discs.

[0004] The technical solution of this utility model is as follows: it includes a web, a panel, a rotating frame, a rotating seat, a fixing assembly, and a welding torch. The rotating seat is rotatably mounted on the rotating frame, and the rotation axis of the rotating seat is parallel to the horizontal plane. The rotating seat has a tooling mold mounting hole that extends through the front and rear directions. The fixing assembly includes a lower mold, a tooling upper mold slider assembly, and a first driving device. The lower mold is installed at the bottom inside the tooling mold mounting hole. The panel is detachably mounted on the upper surface of the lower mold. The tooling upper mold slider assembly is movably mounted inside the tooling mold mounting hole. The web is detachably mounted at the bottom of the tooling upper mold slider assembly. The first driving device can drive the web on the tooling upper mold slider assembly to abut against or move away from the panel on the lower mold. The welding torch for welding the web to the panel is movably mounted in front of or behind the rotating seat.

[0005] Furthermore, the width of the panel in the front-to-back direction is greater than the width of the lower mold in the front-to-back direction. The panel has a positioning hole corresponding to the position of the lower mold. The upper end face of the lower mold has a positioning pin. Two panel outer limiting blocks are installed on both the front and back sides of the lower mold and spaced apart in the left-to-right direction. When the panel is placed on the upper end face of the lower mold, the positioning pin is located in the positioning hole, and the panel is located between the four panel outer limiting blocks.

[0006] Furthermore, an ejector device is installed inside the rotating seat. The ejector device is located in front of or behind the lower mold. The ejector device includes an ejector component that can move up and down. The ejector component is located below the panel on the lower mold.

[0007] Furthermore, slide rails are installed on both the left and right side walls of the tooling mold mounting hole; The tooling upper mold slider assembly includes an upper mold core and slider inserts. The slider inserts are installed on both the left and right side walls of the upper mold core. The two slider inserts are slidably connected to the two slide rails respectively. The upper mold core is connected to the first driving device. The web is detachably installed at the bottom of the upper mold core.

[0008] Furthermore, the web plate is installed at the bottom of both the front and rear sides of the upper mold core; The welding torch is mounted at both the front and rear of the rotating base.

[0009] Furthermore, clamping side plates are installed on both the front and rear sides of the upper mold core. The clamping side plates are movably installed on the upper mold core, and the clamping side plates can clamp the web plate between the clamping side plates and the upper mold core.

[0010] Furthermore, the bottom of both the front and rear sides of the upper mold core has a cavity for accommodating the web plate. The cavity has two locking pins, which are spaced apart in the left-right direction. The locking pins penetrate the upper mold core in the front-back direction. The front part of the locking pin is placed in the front cavity, and the rear part of the locking pin is placed in the rear cavity. The web plate located on the front side of the upper mold core is placed in the front cavity and engaged with the front of the two bayonet positioning pins; The web plate located on the rear side of the upper mold core is placed in the rear cavity and engaged with the rear of the two bayonet positioning pins.

[0011] Furthermore, the rotating seat is rotatably mounted on the top of the rotating frame, the outer wall of the rotating seat has multiple external teeth, the interior of the rotating frame is equipped with gears that mesh with the external teeth, and the outer side of the rotating frame is equipped with a motor for driving the gears to rotate.

[0012] Furthermore, the rotating frame has two guide bearing roller sets for supporting the rotation of the rotating seat, and the rotating seat is placed on the guide bearing roller sets.

[0013] Furthermore, the motor is covered with a dust cover.

[0014] The brake disc welding machine according to this utility model has at least the following technical effects: 1. A rotating base, a first driving device, and a welding torch located in front of or behind the rotating base are used to install a lower mold and an upper mold slider assembly in the tooling mounting hole of the rotating base. The panel can be placed on the lower mold for fixation, while the web can be fixed to the bottom of the upper mold slider assembly. The first driving device can drive the upper mold slider assembly to move, keeping the web on the upper mold slider assembly in contact with the panel on the lower mold. Since the rotating base can rotate, when the rotating base is driven to rotate, the welding torch can weld the entire gap at the contact point between the web and the panel. The brake disc welding machine uses the above structure to realize machine welding operation, ensuring that the web is placed in the same position each time, avoiding manual welding, improving welding accuracy and welding efficiency. The above structure also realizes synchronous welding operation of machine rotation, which is equivalent to flat welding at each point, eliminating the phenomenon of weld flow caused by climbing welding, ensuring the penetration depth of each weld, and reducing scrap or defective products.

[0015] 2. By setting positioning pins and four external panel limit blocks, the positioning pins can be engaged with the positioning holes on the panel itself. The positioning pins can restrict the panel from moving left and right, and the four external panel limit blocks can restrict the panel from moving back and forth, thereby ensuring that the panel is placed in the same position every time, thus improving welding accuracy.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Additional aspects and advantages of this utility model will become apparent and readily understood from the description of the technical solution in conjunction with the following drawings, wherein: Figure 1 A schematic diagram of a structure in which two web plates are welded to a panel. Figure 2 A schematic diagram of a brake disc welding machine from a certain perspective; Figure 3 This is a schematic diagram of the fixing assembly when the web is not placed on the panel. Figure 4 This is a schematic diagram of the fixing assembly when the web is placed on the panel. Figure 5 This is a schematic diagram of a structure where the panel is placed on the lower mold; Figure 6 A schematic diagram showing the structure where the ejector component is located below the panel; Figure 7 A schematic diagram of the structure for fixing two web plates to the upper mold slider assembly of the tooling; Figure 8 A schematic diagram of the brake disc welding machine from another perspective; Figure 9 This is a schematic diagram of the upper mold core. Figure 10 A schematic diagram of a structure in which the web plate is placed on the upper mold core; Figure 11 This is a schematic diagram of the brake disc welding machine from another perspective.

[0018] Reference numerals: web plate 100, panel 200, bayonet 101, positioning hole 210, rotating frame 300, motor 310, guide bearing roller group 320, rotating seat 400, tooling mold mounting hole 410, external tooth 420, fixing component 500, lower mold 510, positioning pin 511, panel outer limit block 512, tooling upper mold slider assembly 520, upper mold core 521, cavity 5211, bayonet positioning pin 5212, slider insert 522, first driving device 530, slide rail 540, clamping side plate 550, welding gun 600, ejection device 700, ejector 710. Detailed Implementation

[0019] The technical solution of this utility model is described in detail below. Examples of the technical solution are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The technical solution described below with reference to the accompanying drawings is exemplary and is only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figure 1As shown, the brake disc welding machine provided in the embodiment of this utility model includes a web 100 and a face plate 200, as... Figure 2 As shown, the brake disc welding machine also includes a rotating frame 300, a rotating base 400, a fixing assembly 500, and a welding torch 600 for welding the web 100 to the panel 200. The rotating base 400 is rotatably mounted on the rotating frame 300. The rotation axis of the rotating base 400 is parallel to the horizontal plane, and the rotating base 400 has a tooling mounting hole 410 extending through the front-rear direction. Figure 2 , 3 As shown, the fixing assembly 500 includes a lower mold 510, a tooling upper mold slider assembly 520, and a first driving device 530. The lower mold 510 is installed at the bottom inside the tooling mold mounting hole 410. The panel 200 is detachably installed on the upper end surface of the lower mold 510. The tooling upper mold slider assembly 520 is movably installed inside the tooling mold mounting hole 410. The web plate 100 is detachably installed at the bottom of the tooling upper mold slider assembly 520. The first driving device 530 can drive the web plate 100 on the tooling upper mold slider assembly 520 to abut against or move away from the panel 200 on the lower mold 510. The welding torch 600 is movably installed in front of or behind the rotating seat 400.

[0024] By configuring a rotating base 400, a first driving device 530, and a welding torch 600 located in front of or behind the rotating base 400, a lower mold 510 and a tooling upper mold slider assembly 520 are installed in the tooling mold mounting hole 410 of the rotating base 400. The panel 200 can be placed on the lower mold 510 for fixation, while the web 100 can be fixed to the bottom of the tooling upper mold slider assembly 520. The first driving device 530 can drive the tooling upper mold slider assembly 520 to move, so that the web 100 on the tooling upper mold slider assembly 520 remains in contact with the panel 200 on the lower mold 510. Since the rotating base 400 can rotate, when the rotating base 400 is driven to rotate, the welding torch 600 can weld the entire gap at the contact point between the web 100 and the panel 200. The brake disc welding machine adopts the above structure to realize machine welding operation, ensuring that the position of the web is the same each time, avoiding manual welding, and improving welding accuracy and welding efficiency.

[0025] Before welding, such as Figure 3 As shown, the worker places the panel 200 on the upper surface of the lower mold 510 for fixation and places the web 100 on the bottom of the upper mold slider assembly 520 for fixation. During welding, the worker drives the first drive device 530, which drives the upper mold slider assembly 520 to move, causing it to move towards the lower mold 200 (downward), so that the web 100 on the upper mold slider assembly 520 remains in contact with the panel 200 on the lower mold 510. Figure 2As shown, the welding torch 600 is then driven to move closer to the rotating seat 400 (moving forward or backward), so that the nozzle of the welding torch 600 is close to the contact point (α) between the web plate 100 and the panel 200 and the nozzle of the welding torch 600 is facing the contact point (α) between the web plate 100 and the panel 200; then the rotating seat 400 is driven to rotate, so that the welding torch 600 welds the entire arc-shaped gap at the contact point between the web plate 100 and the panel 200. After welding is completed, the upper mold slider assembly 520 no longer fixes the web plate 100. The operator then drives the first driving device 530, which drives the upper mold slider assembly 520 to move away from the lower mold 510. At this time, the operator can remove the welded web plate 100 and panel 200.

[0026] Specifically, the rotation of the rotating seat 400 can be driven by a drive device, such as using a motor 310 to drive the rotating seat 400 to rotate, or it can be driven manually to rotate the rotating seat 400.

[0027] Specifically, motor 310 is a servo rotary motor.

[0028] Specifically, the first driving device 530 is a hydraulic cylinder.

[0029] Furthermore, such as Figure 5 As shown, the width of the panel 200 in the front-to-back direction is greater than the width of the lower mold 510 in the front-to-back direction. The panel 200 has a positioning hole 210 corresponding to the position of the lower mold 510. The upper end face of the lower mold 510 has a positioning pin 511. Two panel outer limiting blocks 512 are installed on the front and back sides of the lower mold 510, which are spaced apart in the left-to-right direction. When the panel 200 is placed on the upper end face of the lower mold 510, the positioning pin 511 is located in the positioning hole 210, and the panel 200 is located between the four panel outer limiting blocks 512.

[0030] By setting up positioning pins 511 and four panel outer limit blocks 512, the positioning holes 210 on the panel 200 itself can be engaged with the positioning pins 511. The positioning pins 511 can restrict the left and right movement of the panel 200, and the four panel outer limit blocks 512 can restrict the front and back movement of the panel 200, thereby ensuring that the position of the panel 200 is the same each time the operator places it, thus improving the welding accuracy.

[0031] Furthermore, such as Figure 1 , 6 As shown, the rotary seat 400 is equipped with an ejector device 700, which is located in front of or behind the lower mold 510. The ejector device 700 includes an ejector member 710 that can move up and down, and the ejector member 710 is located below the panel 200 on the lower mold 510.

[0032] By providing an ejector 710 that moves up and down, after welding is completed, the ejector 710 can drive the panel 200 to move upward, so that the panel 200 is no longer stuck with the positioning pin 511, making it convenient for workers to remove the welded product.

[0033] Specifically, the ejector device 700 includes a cylinder, and the cylinder's extension rod is connected to the ejector 710.

[0034] Furthermore, such as Figure 1 As shown, slide rails 540 are installed on both the left and right side walls of the tooling mold mounting hole 410. like Figure 3 As shown, the tooling upper mold slider assembly 520 includes an upper mold core 521 and slider inserts 522. Slider inserts 522 are installed on both the left and right side walls of the upper mold core 521. The two slider inserts 522 are slidably connected to two slide rails 540 respectively. The upper mold core 521 is connected to the first drive device 530. The web plate 100 is detachably installed on the bottom of the upper mold core 521.

[0035] By setting up the slider insert 522 and the slide rail 540, the slide rail 540 can guide the upper mold core 521 to move up and down, ensuring that the web plate 100 abuts against the panel 200 at the same position each time, thereby improving the welding accuracy.

[0036] Furthermore, such as Figure 7 As shown, web plates 100 are installed on the bottom of both the front and rear sides of the upper mold core 521. like Figure 8 As shown, welding torches 600 are installed at both the front and rear of the rotating base 400.

[0037] The bottom of the upper mold core 521 can fix two web plates 100. Welding guns 600 are installed at the front and rear of the rotating seat 400, so that the two web plates 100 can be welded to the panel 200 at the same time, improving processing efficiency.

[0038] Furthermore, such as Figure 7 As shown, clamping side plates 550 are installed on the front and rear sides of the upper mold core 521. The clamping side plates 550 are movable on the upper mold core 521 and can clamp the web plate 100 between the clamping side plates 550 and the upper mold core 521.

[0039] The clamping side plate 550 is provided to clamp the web plate 100 between the clamping side plate 550 and the upper mold core 521, which facilitates the placement of the clamping side plate 550 by the staff.

[0040] During placement, drive the clamping side plate 550 away from the upper mold core 521. The operator places the web plate 100 between the clamping side plate 550 and the upper mold core 521, and then drives the clamping side plate 550 closer to the upper mold core 521. The clamping side plate 550 clamps the web plate 100 between the clamping side plate 550 and the upper mold core 521, completing the installation of the web plate 100. After welding is completed, drive the clamping side plate 550 away from the upper mold core 521. At this time, the welded product can be taken out.

[0041] Specifically, the two clamping side plates 550 can be driven by two different hydraulic cylinders, enabling the clamping side plates 550 to move towards or away from the upper mold core 521, or the two clamping side plates 550 can be driven by the same hydraulic cylinder. A double-headed shaft is installed on the upper mold core 521, and the two clamping side plates 550 are mounted on the double-headed shaft in a back-and-forth motion manner. The fixed seat of the hydraulic cylinder is connected to one of the clamping side plates 550, and the extension rod of the hydraulic cylinder is connected to the other clamping side plate 550. When the extension rod of the hydraulic cylinder retracts, the two clamping side plates 550 move closer to each other, clamping the web plate 100 between the clamping side plates 550 and the upper mold core 521. Conversely, the two clamping side plates 550 move further apart, releasing the web plate 100.

[0042] Furthermore, such as Figure 7 , 9 As shown, the bottom of both the front and rear sides of the upper mold core 521 has a cavity 5211 for accommodating the web plate 100. Each cavity 5211 has two locking pins 5212, which are spaced apart in the left-right direction and penetrate the upper mold core 521 in the front-back direction. Figure 9 As shown, the front part of the bayonet positioning pin 5212 is placed in the front cavity 5211, and the rear part of the bayonet positioning pin 5212 is placed in the rear cavity 5211. like Figure 10 As shown, the web plate 100 located on the front side of the upper mold core 521 is placed in the front cavity 5211 and is engaged with the front part of the two bayonet positioning pins 5212. The web plate 100 located on the rear side of the upper mold core 521 is placed in the rear cavity 5211 and is engaged with the rear of the two bayonet positioning pins 5212.

[0043] The web plate 100 is pre-positioned by a cavity 5211 and two bayonet positioning pins 5212, which facilitates the placement of the web plate 100 by the staff and ensures that the position of the web plate 100 is the same each time, thereby improving the welding accuracy.

[0044] Specifically, such as Figure 10As shown, the web plate 100 has a bayonet 101 at the position of the two bayonet positioning pins 5212. During installation, the bayonet positioning pins 5212 are inserted into the bayonet 101. The bayonet 101 is a structure that the web plate 100 itself has.

[0045] Furthermore, such as Figure 11 As shown, the rotating seat 400 is rotatably mounted on the top of the rotating frame 300. The outer side wall of the rotating seat 400 has a plurality of external teeth 420. The rotating frame 300 is equipped with gears (not shown in the figure) that mesh with the external teeth 420. The rotating frame 300 is equipped with a motor 310 for driving the gears to rotate.

[0046] The rotating seat 400 is driven to rotate by the motor 310, gears and external gears 420, which facilitates the rotation of the rotating seat 400.

[0047] Furthermore, such as Figure 11 As shown, the rotating frame 300 has two guide bearing roller sets 320 for supporting the rotation of the rotating seat 400, and the rotating seat 400 is placed on the guide bearing roller sets 320.

[0048] The guide bearing roller group 320 facilitates the movement of the rotating seat 400.

[0049] Furthermore, a dust cover (not shown in the figure) is provided on the outside of the motor 310 to ensure that the motor 310 works normally.

[0050] Although the technical solutions of this utility model have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these technical solutions without departing from the principles and spirit of this utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A special machine for welding brake discs, comprising a web and a faceplate, characterized in that, Also includes: Rotating support; A rotating seat is rotatably mounted on the rotating frame, the rotation axis of the rotating seat is parallel to the horizontal plane, and the rotating seat has a tooling and mold mounting hole that extends through the front and rear directions; A fixed assembly includes a lower mold, a tooling upper mold slider assembly, and a first driving device. The lower mold is installed at the bottom inside the tooling mold mounting hole. The panel is detachably installed on the upper surface of the lower mold. The tooling upper mold slider assembly is movably installed inside the tooling mold mounting hole. The web is detachably installed at the bottom of the tooling upper mold slider assembly. The first driving device can drive the web on the tooling upper mold slider assembly to abut against or move away from the panel on the lower mold. The welding torch used to weld the web plate to the panel is movably mounted in front of or behind the rotating base.

2. The brake disc welding machine according to claim 1, characterized in that: The width of the panel in the front-to-back direction is greater than the width of the lower mold in the front-to-back direction. The panel has a positioning hole corresponding to the position of the lower mold. The upper end face of the lower mold has a positioning pin. Two panel outer limiting blocks are installed on the front and back sides of the lower mold and are spaced apart in the left-to-right direction. When the panel is placed on the upper end face of the lower mold, the positioning pin is located in the positioning hole, and the panel is located between the four panel outer limiting blocks.

3. The brake disc welding machine according to claim 2, characterized in that: An ejector device is installed inside the rotating seat. The ejector device is located in front of or behind the lower mold. The ejector device includes an ejector component that can move up and down. The ejector component is located below the panel on the lower mold.

4. The brake disc welding machine according to claim 1, characterized in that: The tooling mold mounting holes are equipped with slide rails on both the left and right side walls; The tooling upper mold slider assembly includes an upper mold core and slider inserts. The slider inserts are installed on both the left and right side walls of the upper mold core. The two slider inserts are slidably connected to the two slide rails respectively. The upper mold core is connected to the first driving device. The web is detachably installed at the bottom of the upper mold core.

5. The brake disc welding machine according to claim 4, characterized in that: The web plate is installed at the bottom of both the front and rear sides of the upper mold core; The welding torch is mounted at both the front and rear of the rotating base.

6. The brake disc welding machine according to claim 5, characterized in that: Clamping side plates are installed on the front and rear sides of the upper mold core. The clamping side plates are movably mounted on the upper mold core and can clamp the web plate between the clamping side plates and the upper mold core.

7. The brake disc welding machine according to claim 6, characterized in that: The bottom of both the front and rear sides of the upper mold core has a cavity for accommodating the web plate. The cavity has two locking pins, which are spaced apart in the left-right direction. The locking pins penetrate the upper mold core in the front-back direction. The front part of the locking pin is placed in the front cavity, and the rear part of the locking pin is placed in the rear cavity. The web plate located on the front side of the upper mold core is placed in the front cavity and engaged with the front of the two bayonet positioning pins; The web plate located on the rear side of the upper mold core is placed in the rear cavity and engaged with the rear of the two bayonet positioning pins.

8. The brake disc welding machine according to claim 1, characterized in that: The rotating seat is rotatably mounted on the top of the rotating frame. The outer side wall of the rotating seat has multiple external teeth. A gear that meshes with the external teeth is installed inside the rotating frame. A motor for driving the gear to rotate is installed on the outer side of the rotating frame.

9. The brake disc welding machine according to claim 8, characterized in that: The rotating frame has two guide bearing roller sets for supporting the rotation of the rotating seat, and the rotating seat is placed on the guide bearing roller sets.

10. The brake disc welding machine according to claim 8, characterized in that: The motor is covered with a dust cover.