Automobile welding seam polishing and grinding device and method

Abstract

The invention relates to the technical field of weld joint grinding, in particular to an automobile weld joint polishing and grinding device and method.The automobile weld joint polishing and grinding device comprises an outer ring body and a digital display control panel, the outer ring body is provided with an outer opening used for allowing a welded body to enter and exit, and an inner ring body is rotationally arranged in the outer ring body; the inner ring body is provided with an inner opening used for enabling a welding body to enter and exit, and the outer ring body is provided with two or more gear driving assemblies used for enabling the inner ring body to rotate in the outer ring body. Polishing assemblies are arranged on the two sides of the inner ring body along the rotating central axis of the inner ring body, and polishing angle adjusting assemblies used for adjusting the polishing angles of the polishing assemblies are arranged on the inner ring body; through mutual cooperation and cooperation of the outer ring body, the inner ring body, the gear driving assembly, the grinding assembly and the like, 360-degree circumferential grinding can be conducted on a closed-loop welding seam, and the problems that handheld grinding is difficult and low in efficiency at different directions and angles are avoided.

Description

Technical Field

[0001] The invention relates to the field of weld grinding, and in particular to a device and method for polishing and grinding an automobile weld. Background Art

[0002] In the field of automobile manufacturing, welding technology is a key link in car body assembly. The car body is welded from many parts, and the quality of the weld directly affects the safety, aesthetics and overall performance of the car. However, the welds after welding often have problems such as surface unevenness, protrusions, and residual welding slag, which not only affect the appearance of the car body, but may also cause a series of problems in subsequent painting, assembly and other processes. Therefore, it is very important to polish and grind the car welds.

[0003] Publication number CN116872064A is a vehicle body-in-white roof weld grinding and polishing device and method, the polishing device includes a polishing disc, a motor, a dust cover and a mounting bracket; A polishing and grinding device for automobile parts processing with publication number CN119347624A comprises a base, a polishing cylinder is fixedly connected to the top of the base, a material inlet and outlet assembly is arranged on the side wall of the polishing cylinder, and further comprises: a fluid compression assembly, the fluid compression assembly is arranged in the polishing cylinder, and the fluid compression assembly is used to perform fluid polishing on the automobile parts loaded in the polishing cylinder; During the welding process of parts, some welds are often closed-loop. The traditional method of grinding automobile welds mainly relies on manual operation. Workers hold grinding tools and grind the closed-loop welds one by one in all directions. Different angles make grinding too difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for polishing and grinding automobile welds in order to solve the above-mentioned problems.

[0005] To achieve the above object, the present invention provides the following technical solutions: The present invention provides an automobile weld polishing and grinding device, comprising an outer ring body and a digital display control panel, wherein the outer ring body is provided with an outer opening for realizing the entry and exit of a welding body, an inner ring body is rotatably arranged inside the outer ring body, the inner ring body is provided with an inner opening for realizing the entry and exit of the welding body, and the outer ring body is provided with more than two gear drive assemblies for realizing the rotation of the inner ring body in the outer ring body; The inner ring body is provided with grinding assemblies on both sides along the rotation center axis thereof, and the inner ring body is provided with a grinding angle adjustment assembly for adjusting the grinding angle of the grinding assembly; A lifting and adjusting assembly for adjusting the vertical height of the outer ring is disposed on one side of the outer ring body, and a seat plate structure for supporting the lifting and adjusting assembly is disposed on the bottom side of the lifting and adjusting assembly; The lifting and lowering adjustment component is provided with a horizontal position adjustment component for moving the inner ring body along the direction of its rotational central axis.

[0006] Furthermore, the gear drive assembly is provided with two gear drive assemblies symmetrically distributed with the outer opening as the center, and the spacing between the two gear drive assemblies is greater than the diameter of the inner opening. The gear drive assembly includes a first gear, and the first gear is provided with extended angle plates at both ends along its axial direction for supporting and rotating it. The outer ring body and the extended angle plates are integrally formed, and a first motor for driving the first gear to rotate is fixedly provided on one of the extended angle plates, and an angle sensor for detecting the rotation angle of the first gear is provided on the other extended angle plate. A gear ring for meshing with the first gear is provided on the outer side of the inner ring body, and a cover is provided between the two extended angle plates. The output end of the digital display control panel is electrically connected to the input end of the first motor, and the output end of the angle sensor is electrically connected to the input end of the digital display control panel.

[0007] Furthermore, the grinding assembly includes a fixed seat, on which a first electric telescopic rod is fixedly arranged, the push rod head end of the first electric telescopic rod is fixedly connected to a second motor, the output shaft end of the second motor is connected to a grinding turntable, and the output end of the digital display control panel is electrically connected to the input end of the first electric telescopic rod and the second motor respectively.

[0008] Furthermore, the grinding angle adjustment assembly includes an inner boss, which is fixedly arranged on the inner side wall of the inner ring body opposite to the inner opening, and two parallel seat rods are fixedly arranged on the inner boss, and the axes of the seat rods are parallel to the rotation center axis of the inner ring body. Two oppositely arranged support seats are arranged on the seat rod, and the fixed seat is rotatably arranged between the two support seats through a support shaft, and a support block is arranged on the seat rod between the support seat and the inner boss, and a second electric telescopic rod for driving the fixed seat to rotate around the support shaft is arranged on the support block, and the output end of the digital display control panel is electrically connected to the input end of the second electric telescopic rod.

[0009] Furthermore, the support block is provided with a first through hole for sliding through the seat rod, and the support block is threadedly connected with a first tightening bolt for tightening and fixing the seat rod in the first through hole, and the support seat is provided with a second through hole for sliding through the seat rod, and the support seat is threadedly connected with a second tightening bolt for tightening and fixing the seat rod in the second through hole.

[0010] Furthermore, the seat plate structure includes a base, the outer shape of the base is a rectangular parallelepiped, universal wheels are arranged at the four corners of the lower side of the base, a seat platform is raised at the middle position of the upper side of the base, a storage groove is provided in the base and the seat platform, the lower side of the storage groove is open and a pressure bottom plate is arranged at the opening for up and down movement, a cylinder for driving the pressure bottom plate to move up and down is arranged in the storage groove, the digital display control panel is arranged on the base, and the output end of the digital display control panel is electrically connected to the input end of the cylinder.

[0011] Furthermore, the lifting and lowering adjustment component includes a lifting and lowering adjustment rod, the lower end of which is fixedly arranged on the base, the lifting and lowering adjustment rod is slidably sleeved with a slide cylinder in the up and down directions, an outer shell is fixedly arranged on one side of the slide cylinder, the outer shell and the slide cylinder are connected to each other, a second gear is rotatably arranged in the outer shell, and a third motor for driving the second gear to rotate is also arranged in the outer shell, a guide groove is provided on the side of the lifting and lowering adjustment rod facing the second gear, the extension direction of the guide groove is consistent with the axial direction of the lifting and lowering adjustment rod, a linear rack for meshing with the second gear is arranged in the guide groove, and the horizontal position adjustment component is arranged on the slide cylinder.

[0012] Furthermore, the horizontal position adjustment component includes an adjustment frame body having a rectangular frame shape, one side of the adjustment frame body is fixedly connected to the slide cylinder through a connecting frame, a lead screw is rotatably arranged in the adjustment frame body, the axial direction of the lead screw body is consistent with the length direction of the adjustment frame body, two guide rods symmetrically distributed with the lead screw body as the center are arranged on both sides of the lead screw, a slider is threadedly connected to the lead screw, one side of the slider body is fixedly connected to the outer ring body, a guide slide hole is penetrated through the slider body for cooperating and slidingly connecting with the guide rod, a fourth motor for driving the lead screw body to rotate is arranged on the adjustment frame body, and the output end of the digital display control panel is electrically connected to the input end of the fourth motor.

[0013] Furthermore, a pressure sensor for real-time detection of the pressure between the grinding turntable and the workpiece is provided at the connection between the push rod head end of the first electric telescopic rod and the second motor, and the output end of the pressure sensor is electrically connected to the input end of the digital display control panel.

[0014] A method for polishing and grinding an automobile weld comprises the following steps: S1: Move to a suitable working position through the universal wheels provided on the bottom side of the base to ensure that the base is placed stably. According to the size and shape of the workpiece to be polished, adjust the height position of the outer ring body through the lifting and adjusting assembly so that the outer opening of the outer ring body is aligned with the part of the workpiece to be polished; S2: The gear drive assembly drives the inner ring body to rotate in the outer ring body, so that the inner opening and the outer opening are in the same position, and the universal wheel on the bottom side of the base moves again, so that the workpiece to be polished enters the inner ring body from the outer opening and the inner opening in turn, and then the cylinder drives the bottom plate to contact with the ground to increase the friction force, so as to achieve the overall position fixation; S3: The first electric telescopic rod of the grinding assembly can adjust the distance between the grinding turntable and the workpiece to be ground, and the grinding angle adjustment assembly can also adjust the grinding angle of the grinding turntable, so that the grinding turntable and the grinding part are closely attached. During the grinding process, the gear drive assembly can drive the inner ring body to rotate on the outer ring body, thereby achieving 360-degree circular grinding of the workpiece to be ground; S4: During the grinding process, the two grinding assemblies can perform graded grinding respectively. When grinding the same grinding position, after one of the grinding assemblies performs the initial grinding, the horizontal position adjustment assembly exchanges the positions of the two grinding assemblies, and the other grinding assembly performs the secondary grinding.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the coordination and cooperation between the outer ring body, the inner ring body, the gear drive assembly and the grinding assembly, the closed-loop weld can be ground in a 360-degree circular manner, thus avoiding the difficulty and low efficiency of hand-held grinding at different directions and angles; 2. The grinding angle adjustment component can accurately push the fixed seat to rotate around the support shaft according to the preset grinding angle requirements, so as to achieve precise adjustment of the grinding angle, so that the grinding turntable is closely attached to the grinding part; 3. The lifting and adjusting assembly can adjust the height of the grinding position of the grinding assembly, and align the outer opening of the outer ring body with the part of the workpiece to be ground according to the size and shape of the workpiece to be ground; 4. During the grinding process, the two grinding components can perform graded grinding respectively. When grinding the same grinding position, after one of the grinding components performs the initial grinding, the horizontal position adjustment component exchanges the positions of the two grinding components, and the other grinding component performs the secondary grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 The present invention Figure 1 A right view structural diagram of ; Figure 3 The present invention Figure 1 A schematic diagram of a three-dimensional structure in a first direction; Figure 4 The present invention Figure 3 A schematic diagram of the local enlarged structure at B; Figure 5 The present invention Figure 2 AA cross-sectional structural diagram; Figure 6 The present invention Figure 5 A schematic diagram of the local enlarged structure at C; Figure 7 The present invention Figure 1 A schematic diagram of the three-dimensional structure in the second direction.

[0018] The reference numerals are as follows: 1. outer ring body; 101. outer opening; 102. outer angle plate; 103. cover; 2. inner ring body; 201. inner opening; 202. gear ring; 3. gear drive assembly; 301. first motor; 302. first gear; 303. angle sensor; 4. grinding assembly; 401. fixed seat; 402. first electric telescopic rod; 403. second motor; 404. grinding turntable; 405. pressure sensor; 5. grinding angle adjustment assembly; 501. inner boss; 502. seat rod; 503. support block; 504. second electric telescopic rod ; 505, support seat; 506, support shaft; 6, lifting adjustment component; 601, outer shell; 602, lifting adjustment rod; 603, linear rack; 604, slide; 605, connecting frame; 606, second gear; 607, third motor; 608, guide groove; 7, horizontal position adjustment component; 701, adjustment frame; 702, lead screw; 703, fourth motor; 704, guide rod; 705, slider; 8, seat plate structure; 801, base; 802, seat platform; 803, bottom plate; 804, universal wheel; 805, cylinder; 9, digital display control panel. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 7As shown, the present invention provides an automobile weld polishing and grinding device, including an outer ring body 1 and a digital display control panel 9, the outer ring body 1 is provided with an outer opening 101 for achieving the entry and exit of the welding body, an inner ring body 2 is rotatably arranged inside the outer ring body 1, the inner ring body 2 is provided with an inner opening 201 for achieving the entry and exit of the welding body, the outer ring body 1 is provided with more than two gear driving components 3 for realizing the rotation of the inner ring body 2 in the outer ring body 1; the inner ring body 2 is provided with grinding components 4 on both sides along the rotation center axis thereof, and the inner ring body 2 is provided with a grinding angle adjustment component 5 for adjusting the grinding angle of the grinding component 4; a lifting and adjusting component 6 for adjusting the upper and lower heights thereof is provided on one side of the outer ring body 1, and a seat plate structure 8 for supporting the lifting and adjusting component 6 is provided on the bottom side thereof; the lifting and adjusting component 6 is provided with a horizontal position adjustment component 7 for moving the inner ring body 2 along the rotation center axis thereof.

[0021] The gear drive assembly 3 is provided with two symmetrically distributed with the outer opening 101 as the center, and the distance between the two gear drive assemblies 3 is larger than the diameter of the inner opening 201. This symmetrical design not only ensures that the driving force on the inner ring body 2 is uniform and stable, but also the distance between the two gear drive assemblies 3 is carefully designed to be significantly larger than the diameter of the inner opening 201, thereby effectively avoiding interruption of the rotation drive of the inner ring body 2 during operation.

[0022] See the instruction manual Figure 2 , Figure 3 and Figure 5As shown, the gear drive assembly 3 includes a first gear 302, and the first gear 302 is provided with an extended angle plate 102 at both ends along its axial direction for supporting the rotation thereof, and the outer ring body 1 and the extended angle plate 102 are integrally formed, which enhances the stability and strength of the overall structure, and also improves the reliability of the first gear 302 in supporting the rotation. A first motor 301 for driving the first gear 302 to rotate is fixedly arranged on one of the extension angle plates 102, and an angle sensor 303 for detecting the rotation angle of the first gear 302 is arranged on the other extension angle plate 102. A gear ring 202 for meshing with the first gear 302 is arranged on the outer side of the inner ring body 2. A cover 103 is arranged between the two extension angle plates 102. The cover 103 is made of high-strength, transparent engineering plastic material, which can effectively prevent external dust and debris from entering the gear drive assembly 3 and affecting the normal operation of the equipment, and is convenient for operators to observe the internal operation at any time. The output end of the digital display control panel 9 is electrically connected to the input end of the first motor 301, and the output end of the angle sensor 303 is electrically connected to the input end of the digital display control panel 9. In order to realize accurate monitoring and feedback control of the rotation angle of the first gear 302, the angle sensor 303 adopts advanced optical or magnetoelectric induction technology, has extremely high resolution and response speed, can detect the rotation angle of the first gear 302 in real time and accurately, and transmit the data to the digital display control panel 9 in a timely manner. Through the above-mentioned specific structural design, the rotation of the output shaft of the first motor 301 can drive the first gear 302 to rotate. The rotation of the first gear 302 can drive the inner ring body 2 to rotate under the support of the outer ring body 1 through the ring gear 202, thereby driving the grinding assembly 4 thereon to rotate in a circle for 360-degree circular grinding.

[0023] See the instruction manual Figure 3 , Figure 4 and Figure 5 As shown, the grinding assembly 4 includes a fixed seat 401. In actual application, the fixed seat 401 is made of high-strength aluminum alloy material and is integrally formed, which not only ensures light weight, but also has excellent rigidity and stability, can effectively resist various impact forces and vibrations generated during the grinding process, and ensure the reliability of the grinding work. A first electric telescopic rod 402 is fixedly arranged on the fixed seat 401, and the push rod head end of the first electric telescopic rod 402 is fixedly connected to the second motor 403, and the output shaft end of the second motor 403 is connected to the grinding turntable 404. Further, the output shaft end of the second motor 403 is connected to the grinding turntable 404 by a plum blossom coupling. The plum blossom coupling has good buffering performance and the ability to compensate for the relative offset of the two shafts, which can effectively reduce the vibration and noise caused by the different axiality between the motor output shaft and the grinding turntable 404, and ensure the stability of the grinding turntable 404 when rotating at high speed. The output end of the digital display control panel 9 is electrically connected to the first electric telescopic rod 402 and the input end of the second motor 403 respectively.

[0024] The grinding angle adjustment component 5 includes an inner boss 501. Furthermore, the inner boss 501 is made of high-strength and high-toughness alloy steel, and is integrally formed with the inner ring body 2 through a forging process to ensure that the connection between the inner boss 501 and the inner ring body 2 is stable and reliable, and can withstand large torque and impact force. The inner boss 501 is fixedly arranged on the inner side wall of the inner ring body 2 opposite to the inner opening 201. Two parallel seat rods 502 are fixedly arranged on the inner boss 501. The axes of the seat rods 502 are parallel to the rotation center axis of the inner ring body 2. Two oppositely arranged support seats 505 are arranged on the seat rod 502. The fixed seat 401 is rotatably arranged between the two support seats 505 through a support shaft 506. A support block 503 is arranged on the seat rod 502 between the support seat 505 and the inner boss 501. A second electric telescopic rod 504 for driving the fixed seat 401 to rotate around the support shaft 506 is arranged on the support block 503. The output end of the digital display control panel 9 is electrically connected to the input end of the second electric telescopic rod 504. The support block 503 is provided with a first through hole for sliding through the seat rod 502, and a first fixing bolt for fastening and fixing the seat rod 502 in the first through hole is threadedly connected to the support block 503. The support seat 505 is provided with a second through hole for sliding through the seat rod 502, and a second fixing bolt for fastening and fixing the seat rod 502 in the second through hole is threadedly connected to the support seat 505. Through the above specific structural design, the second electric telescopic rod 504 uses a servo electric telescopic rod, which can accurately control the telescopic amount with an accuracy of ±0.01mm. Through the precise control of the digital display control panel 9, the second electric telescopic rod 504 can accurately push the fixed seat 401 to rotate around the support shaft 506 according to the preset grinding angle requirements, so as to achieve precise adjustment of the grinding angle.

[0025] The seat plate structure 8 includes a base 801, which has a rectangular shape. Universal wheels 804 are arranged at the four corners of the lower side of the base 801. A seat platform 802 is raised in the middle of the upper side of the base 801. Storage grooves are provided in the base 801 and the seat platform 802. The lower side of the storage groove is open and a pressure bottom plate 803 is arranged at the opening for up and down movement. A cylinder 805 for driving the pressure bottom plate 803 to move up and down is arranged in the storage groove. The digital display control panel 9 is arranged on the base 801, and the output end of the digital display control panel 9 is electrically connected to the input end of the cylinder 805.

[0026] The lifting and adjusting component 6 includes a lifting and adjusting rod 602, the lower end of which is fixedly set on the base 801, and the lifting and adjusting rod 602 is slidably sleeved with a slide 604 in the up and down directions. An outer shell 601 is fixedly set on one side of the slide 604, and the outer shell 601 and the slide 604 are connected to each other. A second gear 606 is rotatably set in the outer shell 601, and a third motor 607 for driving the second gear 606 to rotate is also set in the outer shell 601. A guide groove 608 is opened on the side of the lifting and adjusting rod 602 facing the second gear 606, and the extension direction of the guide groove 608 is consistent with the axial direction of the lifting and adjusting rod 602. A linear rack 603 for meshing with the second gear 606 is set in the guide groove 608, and the horizontal position adjustment component 7 is set on the slide 604. Through the above-mentioned specific structural design, the output shaft of the third motor 607 can rotate to drive the second gear 606 to rotate, thereby cooperating with the linear rack 603 to drive the slide 604 to slide on the lifting and lowering rod 602, thereby adjusting the upper and lower position heights of the outer ring body 1.

[0027] The horizontal position adjustment component 7 includes an adjustment frame 701 in the shape of a rectangular frame. One side of the adjustment frame 701 is fixedly connected to the slide 604 through a connecting frame 605. A lead screw 702 is rotatably arranged in the adjustment frame 701. The axial direction of the lead screw 702 is consistent with the length direction of the adjustment frame 701. Two guide rods 704 symmetrically distributed with the lead screw 702 as the center are arranged on both sides of the lead screw 702. A slider 705 is threadedly connected to the lead screw 702. One side of the slider 705 is fixedly connected to the outer ring body 1. A guide slide hole for cooperating and slidingly connecting with the guide rod 704 is opened on the slider 705. A fourth motor 703 for driving the lead screw 702 to rotate is arranged on the adjustment frame 701. The output end of the digital display control panel 9 is electrically connected to the input end of the fourth motor 703.

[0028] A pressure sensor 405 for real-time detection of the pressure between the grinding turntable 404 and the workpiece is provided at the connection between the push rod head end of the first electric telescopic rod 402 and the second motor 403 , and the output end of the pressure sensor 405 is electrically connected to the input end of the digital display control panel 9 .

[0029] Working principle and technical effect of the present invention: Move the base 801 to a suitable working position through the universal wheels 804 provided on the bottom side of the base 801, ensure that the base 801 is placed stably, turn on the power, turn on the digital display control panel 9, initialize the equipment for self-test, check whether the first motor 301, the second motor 403, the third motor 607, the fourth motor 703, the first electric telescopic rod 402, the second electric telescopic rod 504 and the pressure sensor 405 are working normally, and adjust the height position of the outer ring body 1 through the lifting and adjusting component 6 according to the size and shape of the workpiece to be polished, so that the outer opening 101 of the outer ring body 1 is aligned with the part to be polished of the workpiece; the gear drive component 3 drives the inner ring body 2 to rotate in the outer ring body 1, so that the inner opening 201 and the outer opening 101 are in a coincident position, and move the workpiece to be polished through the universal wheels 804 on the bottom side of the base 801 again, and the workpiece to be polished is sequentially moved from the outer opening 101 and the inner opening 201 to enter the inner ring body 2, and then the cylinder 805 drives the bottom plate 803 to contact the ground to increase the friction force, so as to achieve the overall position fixation; the first electric telescopic rod 402 of the grinding assembly 4 can adjust the distance between the grinding turntable 404 and the workpiece to be ground, and the grinding angle adjustment assembly 5 can also adjust the grinding angle of the grinding turntable 404, so that the grinding turntable 404 is closely attached to the grinding part. During the grinding process, the gear drive assembly 3 can drive the inner ring body 2 to rotate on the outer ring body 1, thereby realizing 360-degree circular grinding of the workpiece to be ground; during the grinding process, the two grinding assemblies 4 can perform graded grinding respectively. When grinding the same grinding position, after one of the grinding assemblies 4 performs the initial grinding, the horizontal position adjustment assembly 7 exchanges the positions of the two grinding assemblies 4, and the other grinding assembly 4 performs the secondary grinding.

[0030] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for polishing and grinding automobile welds, characterized in that: The device comprises an outer ring body (1) and a digital display control panel (9), wherein the outer ring body (1) is provided with an outer opening (101) for enabling the welding body to enter and exit, an inner ring body (2) is rotatably arranged inside the outer ring body (1), the inner ring body (2) is provided with an inner opening (201) for enabling the welding body to enter and exit, and the outer ring body (1) is provided with two or more gear drive assemblies (3) for enabling the inner ring body (2) to rotate inside the outer ring body (1); The inner ring body (2) is provided with grinding assemblies (4) on both sides along the rotation center axis thereof, and the inner ring body (2) is provided with a grinding angle adjustment assembly (5) for adjusting the grinding angle of the grinding assembly (4); A lifting and adjusting assembly (6) for adjusting the vertical height of the outer ring body (1) is disposed on one side thereof, and a seat plate structure (8) for supporting the lifting and adjusting assembly (6) is disposed on the bottom side thereof; The lifting and lowering adjustment component (6) is provided with a horizontal position adjustment component (7) for moving the inner ring body (2) along the direction of its rotational central axis.

2. The automobile weld polishing and grinding device according to claim 1, characterized in that: The gear drive assembly (3) is provided with two gear drive assemblies (3) symmetrically distributed around the outer opening (101), the spacing between the two gear drive assemblies (3) being greater than the diameter of the inner opening (201), the gear drive assembly (3) comprising a first gear (302), both ends of the first gear (302) being provided with outer extension angle plates (102) for supporting the first gear (302) to rotate, and the outer ring body (1) and the outer extension angle plates (102) being integrally formed, one of the outer extension angle plates (102) being fixedly provided with a first gear (302) for driving the first gear (302) to rotate. The motor (301) is provided with an angle sensor (303) for detecting the rotation angle of the first gear (302) on the other of the outer angle plates (102); a gear ring (202) for meshing with the first gear (302) is provided on the outer side of the inner ring body (2); a cover (103) is provided between the two outer angle plates (102); the output end of the digital display control panel (9) is electrically connected to the input end of the first motor (301); and the output end of the angle sensor (303) is electrically connected to the input end of the digital display control panel (9).

3. The automobile weld polishing and grinding device according to claim 1, characterized in that: The grinding assembly (4) comprises a fixed seat (401), a first electric telescopic rod (402) is fixedly arranged on the fixed seat (401), a push rod head end of the first electric telescopic rod (402) is fixedly connected to a second motor (403), an output shaft end of the second motor (403) is connected to a grinding turntable (404), and an output end of the digital display control panel (9) is electrically connected to input ends of the first electric telescopic rod (402) and the second motor (403), respectively.

4. The automobile weld polishing and grinding device according to claim 3, characterized in that: The grinding angle adjustment component (5) comprises an inner boss (501), wherein the inner boss (501) is fixedly arranged on the inner side wall of the inner ring body (2) opposite to the inner opening (201), and two parallel seat rods (502) are fixedly arranged on the inner boss (501), wherein the axis of the seat rod (502) is parallel to the rotation center axis of the inner ring body (2), and two oppositely arranged support seats (505) are arranged on the seat rod (502), and the fixed seat (401) is rotatably arranged between the two support seats (505) via a support shaft (506), and a support block (503) is arranged on the seat rod (502) between the support seat (505) and the inner boss (501), and a second electric telescopic rod (504) for driving the fixed seat (401) to rotate around the support shaft (506) is arranged on the support block (503), and the output end of the digital display control panel (9) is electrically connected to the input end of the second electric telescopic rod (504).

5. The automobile weld polishing and grinding device according to claim 4, characterized in that: The support block (503) is provided with a first through hole for sliding through the seat rod (502), and a first fixing bolt is threadedly connected to the support block (503) for fastening and fixing the seat rod (502) in the first through hole. The support seat (505) is provided with a second through hole for sliding through the seat rod (502), and a second fixing bolt is threadedly connected to the support seat (505) for fastening and fixing the seat rod (502) in the second through hole.

6. The automobile weld polishing and grinding device according to claim 1, characterized in that: The seat plate structure (8) comprises a base (801), the base (801) is in the shape of a rectangular parallelepiped, universal wheels (804) are arranged at the four corners of the lower side of the base (801), a seat platform (802) is arranged protrudingly at the middle position of the upper side of the base (801), a storage groove is provided in the base (801) and the seat platform (802), the lower side of the storage groove is open and a bottom pressure plate (803) is arranged at the opening to move up and down, a cylinder (805) for driving the bottom pressure plate (803) to move up and down is arranged in the storage groove, and the digital display control panel (9) is arranged on the base (801), and the output end of the digital display control panel (9) is electrically connected to the input end of the cylinder (805).

7. The automobile weld polishing and grinding device according to claim 6, characterized in that: The lifting and lowering adjustment component (6) comprises a lifting and lowering adjustment rod (602), the lower end of which is fixedly arranged on a base (801), the lifting and lowering adjustment rod (602) is provided with a slide cylinder (604) which is slidably sleeved in the up-down direction, an outer shell (601) is fixedly arranged on one side of the slide cylinder (604), the interior of the outer shell (601) and the interior of the slide cylinder (604) are communicated with each other, a second gear (606) is rotatably arranged in the outer shell (601), and the outer shell (601) also has a gear (606) which is rotatably arranged in the outer shell (601). A third motor (607) is provided for driving the second gear (606) to rotate; a guide groove (608) is provided on a side of the lifting and adjusting rod (602) facing the second gear (606); an extension direction of the guide groove (608) is consistent with an axial direction of the lifting and adjusting rod (602); a linear rack (603) for meshing with the second gear (606) is provided in the guide groove (608); and the horizontal position adjustment component (7) is provided on the slide cylinder (604).

8. The automobile weld polishing and grinding device according to claim 7, characterized in that: The horizontal position adjustment component (7) comprises an adjustment frame (701) in the shape of a rectangular frame, one side of the adjustment frame (701) is fixedly connected to the slide cylinder (604) via a connecting frame (605), a lead screw (702) is rotatably arranged in the adjustment frame (701), the axial direction of the lead screw (702) is consistent with the length direction of the adjustment frame (701), two guide rods (704) are symmetrically arranged on both sides of the lead screw (702), a slider (705) is threadedly connected to the lead screw (702), one side of the slider (705) is fixedly connected to the outer ring body (1), a guide sliding hole is penetrated through the slider (705) for cooperating with the guide rod (704) for sliding connection, a fourth motor (703) for driving the lead screw (702) to rotate is arranged on the adjustment frame (701), and the output end of the digital display control panel (9) is electrically connected to the input end of the fourth motor (703).

9. The automobile weld polishing and grinding device according to claim 3, characterized in that: A pressure sensor (405) for real-time detection of the pressure between the grinding turntable (404) and the workpiece is provided at the connection between the push rod head end of the first electric telescopic rod (402) and the second motor (403), and an output end of the pressure sensor (405) is electrically connected to an input end of the digital display control panel (9).

10. A method for polishing and grinding automobile welds, using the automobile weld polishing and grinding device according to any one of claims 1 to 9, characterized in that it comprises the following steps: S1: Move the base (801) to a suitable working position by means of a universal wheel (804) provided on the bottom side thereof, ensure that the base (801) is placed stably, and adjust the height position of the outer ring body (1) by means of a lifting and lowering adjustment component (6) according to the size and shape of the workpiece to be polished, so that the outer opening (101) of the outer ring body (1) is aligned with the part of the workpiece to be polished; S2: The gear drive assembly (3) drives the inner ring body (2) to rotate inside the outer ring body (1), so that the inner opening (201) and the outer opening (101) are in a coincident position, and the universal wheel (804) on the bottom side of the base (801) is moved again to move the workpiece to be polished from the outer opening (101) and the inner opening (201) into the inner ring body (2) in sequence, and then the cylinder (805) drives the bottom plate (803) to contact the ground to increase friction, thereby achieving overall position fixation; S3: The first electric telescopic rod (402) of the grinding assembly (4) can adjust the distance between the grinding turntable (404) and the workpiece to be ground, and the grinding angle adjustment assembly (5) can also adjust the grinding angle of the grinding turntable (404), so that the grinding turntable (404) and the grinding part are closely attached. During the grinding process, the gear drive assembly (3) can drive the inner ring body (2) to rotate on the outer ring body (1), thereby achieving 360-degree circular grinding of the workpiece to be ground; S4: During the grinding process, the two grinding assemblies (4) can perform graded grinding respectively. When grinding the same grinding position, after one of the grinding assemblies (4) performs initial grinding, the horizontal position adjustment assembly (7) exchanges the positions of the two grinding assemblies (4), and the other grinding assembly (4) performs secondary grinding.

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