Pre-positioning device used before tailor welding of automobile parts and control method

Abstract

The invention relates to a pre-positioning device before tailor welding of automobile parts and a control method, the pre-positioning device is used for pre-positioning frame-shaped parts of different sizes, and the frame-shaped parts comprise a first part and a second part. The pre-positioning device comprises a moving platform, a first positioning assembly and a second positioning assembly. The two moving platforms can move in a reciprocating mode in the first direction, and the two first positioning assemblies are arranged on the corresponding moving platforms correspondingly. The at least one set of second positioning assemblies are arranged on the moving platform, each set of second positioning assemblies comprises two second positioning assemblies, and the two second positioning assemblies in each set correspond to the two second components. The fixing plates of the two second positioning assemblies in each set are matched to drive the corresponding second component to adjust the position so as to integrally position the frame-shaped part in the second direction. And the two moving platforms are matched to drive the corresponding first parts to adjust the positions so as to integrally position the frame-shaped part in the first direction.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a pre-positioning device and a control method for automobile parts before welding. Background Art

[0002] With the development of the automobile industry, sunroofs have become an important part of modern cars, and their manufacturing quality directly affects vehicle performance. In the production process of sunroof frames, in order to ensure that the components can be accurately assembled during the welding process, it is usually necessary to pre-position the frame before welding. The main purpose of pre-positioning is to ensure the accuracy of their relative positions by adjusting and fixing the spatial positions of frame components, and to prevent the welding quality and structural stability from being affected by position offset during the subsequent welding process.

[0003] In the prior art, the pre-positioning of the skylight frame mainly relies on manual operation, which has obvious shortcomings: first, the positioning accuracy is difficult to guarantee, and the welding quality may be reduced due to human errors; second, the operation is time-consuming and the production efficiency is low, which makes it difficult to meet the needs of efficient assembly; third, the consistency is poor, and the positioning effects of different batches may deviate; fourth, the labor intensity is high, and worker fatigue further affects efficiency and accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a pre-positioning device and control method for automobile parts before welding. The device can realize the overall precise positioning of the frame-type parts in the first direction and the second direction by designing a mobile platform, a first positioning component and a second positioning component to cooperate with each other, thereby greatly improving the positioning accuracy and avoiding errors caused by manual operation; replacing manual adjustment with automated operation can significantly improve production efficiency and reduce labor intensity; utilizing the mechanical cooperation of the limit plate and the positioning pin to ensure the consistency of the positioning process and improve the stability of product quality; at the same time, the device has flexible adjustment capabilities and can adapt to frame-type parts of different sizes, further enhancing the versatility of the device.

[0005] To achieve the above object, according to a first aspect of the present invention, a pre-positioning device for automobile parts before tailor-welding is provided, the pre-positioning device is used to pre-position frame-shaped parts of different sizes, the frame-shaped parts comprising two first components and two second components arranged between the two first components, the pre-positioning device comprising:

[0006] Two movable platforms, capable of reciprocating along a first direction;

[0007] Two groups of first positioning components are respectively arranged on the corresponding mobile platforms, and the first positioning components include:

[0008] A carrying plate, which can reciprocate along the second direction, is provided with a positioning plate, and the carrying plates of each group of two first positioning assemblies cooperate to drive the corresponding positioning plates to adjust positions so as to clamp and position the first component in the second direction;

[0009] A first limiting plate, disposed on the bearing plate and capable of reciprocating along a first direction;

[0010] A first positioning pin is disposed on the bearing plate and is located between the first component and the second component, and the first limiting plate cooperates with the first positioning pin to clamp and position the first component in a first direction;

[0011] At least one group of second positioning components is arranged on the mobile platform, each group of the second positioning components has two, each group of two second positioning components is arranged corresponding to two second components, and the second positioning components include:

[0012] A fixed plate, reciprocatingly movable along a second direction;

[0013] A second limiting plate, disposed on the fixing plate and capable of reciprocating along a second direction;

[0014] A second positioning pin is arranged on the fixing plate, the second limiting plate cooperates with the second positioning pin to clamp and position the second component in the second direction, and the fixing plates of each group of two second positioning assemblies cooperate to drive the corresponding second components to adjust their positions so as to position the frame-shaped part as a whole in the second direction;

[0015] The two mobile platforms cooperate to drive the corresponding first positioning pins to adjust positions so as to clamp and position the second component in the first direction, and at the same time drive the corresponding first component to adjust positions so as to position the frame-type part as a whole in the first direction.

[0016] Optionally, the mobile platform is driven by a first screw transmission assembly, and the first screw transmission assembly includes:

[0017] First motor;

[0018] A first lead screw, arranged along a first direction and connected to a movable end of the first motor;

[0019] A first nut is disposed below the moving platform and is rotationally connected to the first lead screw.

[0020] Optionally, there are two first positioning assemblies in each group, and each group of two first positioning assemblies are respectively arranged at both ends of the mobile platform. A second motor is arranged on the mobile platform, a steering gear box is arranged at the movable end of the second motor, and second screw transmission assemblies are correspondingly arranged on both sides of the steering gear box, and the second screw transmission assembly is connected to the corresponding supporting plate.

[0021] Optionally, a first cylinder is disposed on the supporting plate, and a movable end of the first cylinder is connected to the first limiting plate and is used to drive the first limiting plate to reciprocate along a first direction.

[0022] Optionally, a linear motor is disposed on the movable platform, and the linear motor is used to drive the fixed plate to reciprocate along the second direction.

[0023] Optionally, a second cylinder is disposed on the fixed plate, and a movable end of the second cylinder is connected to the second limiting plate and is used to drive the second limiting plate to reciprocate along the second direction.

[0024] Optionally, the fixing plate is provided with a plurality of rows of fixing holes along the length direction, and the second cylinder is detachably connected to the fixing plate through the fixing holes.

[0025] According to a second aspect of the present invention, a control method for a pre-positioning device for automobile parts before welding is provided, comprising the following steps:

[0026] Controlling the first positioning assembly to clamp and position the first component in a first direction and a second direction;

[0027] Control the mobile platform to cooperate with the second positioning assembly to clamp and position the second component in the first direction and the second direction;

[0028] Controlling the first screw transmission assembly of the pre-positioning device to drive the movable platform to move and adjust the position of the first component, so as to position the frame-shaped part as a whole in a first direction;

[0029] The linear motor controlling the pre-positioning device drives the fixing plates of each group of two second positioning assemblies to move and adjust the corresponding positions of the second components, so as to position the frame-type part as a whole in the second direction.

[0030] Optionally, controlling the first positioning assembly to clamp and position the first component in the first direction and the second direction comprises the following steps:

[0031] Control the first cylinder of the pre-positioning device to drive the first limiting plate to move, so that the first limiting plate cooperates with the first positioning pin to clamp and position the first component in a first direction;

[0032] The second motor, steering gear box and second screw transmission assembly controlling the pre-positioning device cooperate to drive the bearing plates of each group of two first positioning assemblies to move and adjust the corresponding positioning plate positions to clamp and position the first component in the second direction.

[0033] Optionally, the mobile platform cooperates with the second positioning assembly to clamp and position the second component in the first direction and the second direction, comprising the following steps:

[0034] Controlling the first screw transmission assembly of the pre-positioning device to drive the mobile platform to move and adjust the position of the first positioning pin, so as to clamp and position the second component in a first direction;

[0035] The second cylinder of the pre-positioning device is controlled to drive the second limiting plate to move, so that the second limiting plate cooperates with the second positioning pin to clamp and position the second component in the second direction.

[0036] The beneficial effects of the present invention are as follows: by designing a mobile platform, a first positioning component and a second positioning component to cooperate with each other, the overall precise positioning of the frame-type part in the first direction and the second direction can be achieved, the positioning accuracy can be greatly improved, and errors caused by manual operation can be avoided; by replacing manual adjustment with automated operation, the production efficiency can be significantly improved and the labor intensity can be reduced; by utilizing the mechanical coordination of the limit plate and the positioning pin, the consistency of the positioning process can be ensured and the stability of product quality can be improved; at the same time, the device has flexible adjustment capabilities and can adapt to frame-type parts of different sizes, further enhancing the versatility of the device; in addition, the positioning of the second component and the frame-type part as a whole in the first direction can be achieved simultaneously only through the movement and adjustment of the mobile platform, which can simplify the device structure and save the manufacturing cost of the device.

[0037] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural plan view of a pre-positioning device for automobile parts before welding shown in one embodiment of the present invention;

[0039] Figure 2 It is a schematic structural stereogram of a pre-positioning device for automobile parts before welding according to one embodiment of the present invention;

[0040] Figure 3 It is a schematic structural partial diagram of a pre-positioning device for automobile parts before welding shown in one embodiment of the present invention;

[0041] Figure 4This is a schematic structural view of a pre-positioning device for automobile parts before welding shown in one embodiment of the present invention;

[0042] Figure 5 A schematic flow chart of a control method of a pre-positioning device for automobile parts before welding shown in one embodiment of the present invention;

[0043] Figure 6 for Figure 5 Schematic flow chart of step S10;

[0044] Figure 7 for Figure 5 Schematic flow chart of step S20;

[0045] In the figure: 1. frame-type parts; 11. first component; 12. second component; 2. moving platform; 21. second motor; 22. steering gear box; 23. second screw transmission assembly; 24. linear motor; 3. first positioning assembly; 31. bearing plate; 311. positioning plate; 312. first cylinder; 32. first limit plate; 33. first positioning pin; 4. second positioning assembly; 41. fixing plate; 411. second cylinder; 412. fixing hole; 42. second limit plate; 43. second positioning pin; 5. mounting base; 51. first screw transmission assembly; 511. first motor; 512. first screw; 513. first nut; 52. slide rail. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] See also Figures 1 to 3 , a preferred embodiment of the present application shows a pre-positioning device for automobile parts before welding, the pre-positioning device is used to pre-position frame-type parts 1 of different sizes, the frame-type parts 1 include two first parts 11 and two second parts 12 arranged between the two first parts 11, and the pre-positioning device includes a mobile platform 2, a first positioning assembly 3 and a second positioning assembly 4. The two mobile platforms 2 can reciprocate along the first direction, and the two groups of first positioning assemblies 3 are respectively arranged on the corresponding mobile platforms 2. The first positioning assembly 3 includes a bearing plate 31, a first limiting plate 32 and a first positioning pin 33. The bearing plate 31 can reciprocate along the second direction, and a positioning plate 311 is arranged on the bearing plate 31. The bearing plates 31 of each group of two first positioning assemblies 3 cooperate to drive the corresponding positioning plate 311 to adjust the position so as to clamp and position the first component 11 in the second direction. The first limiting plate 32 is arranged on the bearing plate 31 and can reciprocate along the first direction. The first positioning pin 33 is arranged on the bearing plate 31 and is located between the first component 11 and the second component 12. The first limiting plate 32 cooperates with the first positioning pin 33 to clamp and position the first component 11 in the first direction. At least one group of second positioning components 4 is arranged on the mobile platform 2, and each group of second positioning components 4 has two, and each group of two second positioning components 4 is arranged corresponding to two second components 12. The second positioning component 4 includes a fixed plate 41, a second limiting plate 42 and a second positioning pin 43, and the fixed plate 41 can reciprocate along the second direction. The second limiting plate 42 is arranged on the fixed plate 41 and can reciprocate along the second direction. The second positioning pin 43 is arranged on the fixed plate 41, and the second limiting plate 42 cooperates with the second positioning pin 43 to clamp and position the second component 12 in the second direction. The fixed plates 41 of each group of two second positioning components 4 cooperate to drive the corresponding second component 12 to adjust the position so as to position the frame-type part 1 as a whole in the second direction. The two mobile platforms 2 cooperate to drive the corresponding first positioning pins 33 to adjust their positions to clamp and position the second component 12 in the first direction, and at the same time drive the corresponding first component 11 to adjust its position to position the frame-shaped component 1 as a whole in the first direction.

[0050] According to the scheme of the embodiment of the present invention, by designing the mobile platform 2, the first positioning component 3 and the second positioning component 4 to cooperate with each other, on the one hand, the overall precise positioning of the frame-type part 1 in the first direction and the second direction can be achieved, and on the other hand, the individual positioning of the first component 11 and the second component 12 can be achieved, thereby greatly improving the positioning accuracy and avoiding errors caused by manual operation; replacing manual adjustment with automated operation can significantly improve production efficiency and reduce labor intensity; using the mechanical cooperation of the limit plate and the positioning pin, the consistency of the positioning process can be ensured and the stability of product quality can be improved; at the same time, the device has flexible adjustment capabilities and can adapt to frame-type parts 1 of different sizes, further enhancing the versatility of the device. It should be emphasized that the device first clamps and positions the individual first component 11 and the second component 12, and then adjusts the relative positions of the two, thereby achieving the overall positioning of the frame-type part 1. At the same time, the positioning of the second component 12 and the frame-type part 1 as a whole in the first direction can be achieved simultaneously only by the movement and adjustment of the mobile platform 2, which can simplify the device structure and save the manufacturing cost of the device.

[0051] The following is a detailed description with specific embodiments:

[0052] See also Figures 2 to 4 The pre-positioning device also includes a mounting base plate 5, and the mobile platform 2 is driven by a first lead screw 512 transmission assembly 51, and the first lead screw 512 transmission assembly 51 includes a first motor 511, a first lead screw 512 and a first nut 513. The first motor 511 is arranged on the mounting base plate 5, the first lead screw 512 is arranged along the first direction and connected to the movable end of the first motor 511, the first nut 513 is arranged below the mobile platform 2 and is rotatably connected to the first lead screw 512, and a slide rail 52 is arranged between the mobile platform 2 and the mounting base plate 5. Through the transmission of the first lead screw 512, the mobile platform 2 can be driven to move back and forth along the slide rail 52 in the first direction to adjust the position of the first component 11 and the first positioning pin 33, thereby realizing the positioning of the second component 12 and the frame-shaped part 1 as a whole in the first direction.

[0053] See also Figure 2In this embodiment, each group of first positioning components 3 has two, and each group of two first positioning components 3 is respectively arranged at both ends of the mobile platform 2. A second motor 21 is arranged on the mobile platform 2, and a steering gear box 22 is arranged at the movable end of the second motor 21. Second screw transmission components 23 are correspondingly arranged on both sides of the steering gear box 22, and the second screw transmission components 23 are connected to the corresponding bearing plates 31. Through the cooperation of the second motor 21 with the steering gear box 22, the two second screw transmission components 23 can be controlled to move synchronously at the same time, thereby driving the two bearing plates 31 to move synchronously, and then the positioning plate 311 clamps and positions the first component 11 in the second direction. Specifically, the structural composition of the second screw transmission component 23 is the same as that of the first screw 512 transmission component 51, and no further details are given here.

[0054] See also Figure 3 The carrier plate 31 is provided with a first cylinder 312, the movable end of the first cylinder 312 is connected to the first limit plate 32 and is used to drive the first limit plate 32 to move back and forth along the first direction. The first cylinder 312 drives the first limit plate 32 to move, so that the first positioning pin 33 can be used to clamp and position the first components 11 of different sizes.

[0055] See also Figure 2 In this embodiment, there are two sets of the second positioning components 4, and the two sets of second positioning components 4 are respectively arranged on two mobile platforms 2. The mobile platform 2 is provided with a linear motor 24, which is used to drive the fixed plate 41 to reciprocate along the second direction. The fixed plate 41 is driven by the linear motor 24, and then the second component 12 thereon is driven to adjust the position (that is, the position of the frame-shaped part 1 is adjusted in the second direction for overall positioning).

[0056] See also Figure 3 The fixing plate 41 is provided with a second cylinder 411, and the movable end of the second cylinder 411 is connected to the second limiting plate 42 and is used to drive the second limiting plate 42 to move back and forth along the second direction. Similarly, the second limiting plate 42 is driven to move by the second cylinder 411, so that the second locating pin 43 can be used to clamp and position the second components 12 of different sizes.

[0057] See also Figure 3 The fixing plate 41 is provided with a plurality of rows of fixing holes 412 along the length direction, and the second cylinder 411 is detachably connected to the fixing plate 41 through the fixing holes 412. Since the moving stroke of the second cylinder 411 is limited, when the sizes of different second components 12 vary greatly and the stroke of the second cylinder 411 cannot meet the requirements, the second components 12 of different sizes can be positioned by changing the installation position of the second cylinder 411 on the fixing plate 41.

[0058] See also Figure 5The embodiment of the present invention also provides a control method for a pre-positioning device for automobile parts before welding, comprising the following steps:

[0059] Step S10: controlling the first positioning assembly 3 to clamp and position the first component 11 in the first direction and the second direction;

[0060] Step S20: controlling the mobile platform 2 to cooperate with the second positioning assembly 4 to clamp and position the second component 12 in the first direction and the second direction;

[0061] Step S30: Control the first lead screw 512 transmission assembly 51 of the pre-positioning device to drive the mobile platform 2 to move and adjust the position of the first component 11, so as to position the frame-shaped part 1 as a whole in the first direction;

[0062] Step S40: Control the linear motor 24 of the pre-positioning device to drive the fixing plates 41 of each group of two second positioning assemblies 4 to move and adjust the positions of the corresponding second components 12 to position the frame-shaped component 1 as a whole in the second direction.

[0063] See also Figure 6 , the step S10 comprises the following steps:

[0064] Step S101: Control the first cylinder 312 of the pre-positioning device to drive the first limiting plate 32 to move, so that the first limiting plate 32 cooperates with the first positioning pin 33 to clamp and position the first component 11 in the first direction;

[0065] Step S102: Control the second motor 21, the steering gear box 22 and the second screw transmission assembly 23 of the pre-positioning device to cooperate to drive the supporting plates 31 of each group of two first positioning assemblies 3 to move and adjust the position of the corresponding positioning plates 311 to clamp and position the first component 11 in the second direction.

[0066] See also Figure 7 , the step S20 comprises the following steps:

[0067] Step S201: Control the first lead screw 512 transmission assembly 51 of the pre-positioning device to drive the mobile platform 2 to move and adjust the position of the first positioning pin 33 to clamp and position the second component 12 in the first direction;

[0068] Step S202: Control the second cylinder 411 of the pre-positioning device to drive the second limiting plate 42 to move, so that the second limiting plate 42 cooperates with the second positioning pin 43 to clamp and position the second component 12 in the second direction.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pre-positioning device for automobile parts before welding, characterized in that: The pre-positioning device is used to pre-position frame-shaped parts of different sizes, the frame-shaped parts include two first parts and two second parts arranged between the two first parts, and the pre-positioning device includes: Two movable platforms, capable of reciprocating along a first direction; Two groups of first positioning components are respectively arranged on the corresponding mobile platforms, and the first positioning components include: A carrying plate, which can reciprocate along the second direction, is provided with a positioning plate, and the carrying plates of each group of two first positioning assemblies cooperate to drive the corresponding positioning plates to adjust positions so as to clamp and position the first component in the second direction; A first limiting plate, disposed on the bearing plate and capable of reciprocating along a first direction; A first positioning pin is disposed on the bearing plate and is located between the first component and the second component, and the first limiting plate cooperates with the first positioning pin to clamp and position the first component in a first direction; At least one group of second positioning components is arranged on the mobile platform, each group of the second positioning components has two, each group of two second positioning components is arranged corresponding to two second components, and the second positioning components include: A fixed plate, reciprocatingly movable along a second direction; A second limiting plate, disposed on the fixing plate and capable of reciprocating along a second direction; A second positioning pin is arranged on the fixing plate, the second limiting plate cooperates with the second positioning pin to clamp and position the second component in the second direction, and the fixing plates of each group of two second positioning assemblies cooperate to drive the corresponding second components to adjust their positions so as to position the frame-shaped part as a whole in the second direction; The two mobile platforms cooperate to drive the corresponding first positioning pins to adjust positions so as to clamp and position the second component in the first direction, and at the same time drive the corresponding first component to adjust positions so as to position the frame-type part as a whole in the first direction.

2. The pre-positioning device for automobile parts before welding according to claim 1 is characterized in that: The mobile platform is driven by a first screw transmission assembly, and the first screw transmission assembly includes: First motor; A first lead screw, arranged along a first direction and connected to a movable end of the first motor; A first nut is disposed below the moving platform and is rotationally connected to the first lead screw.

3. The pre-positioning device for automobile parts before welding according to claim 1 is characterized in that: There are two first positioning assemblies in each group, and each group of two first positioning assemblies is respectively arranged at both ends of the mobile platform. A second motor is arranged on the mobile platform, a steering gear box is arranged at the movable end of the second motor, and second screw transmission assemblies are correspondingly arranged on both sides of the steering gear box, and the second screw transmission assembly is connected to the corresponding supporting plate.

4. The pre-positioning device for automobile parts before welding according to claim 3 is characterized in that: The bearing plate is provided with a first cylinder, and a movable end of the first cylinder is connected to the first limiting plate and is used for driving the first limiting plate to reciprocate along a first direction.

5. The pre-positioning device for automobile parts before welding according to claim 1 is characterized in that: A linear motor is disposed on the moving platform, and the linear motor is used for driving the fixing plate to move back and forth along the second direction.

6. The pre-positioning device for automobile parts before welding according to claim 5 is characterized in that: The fixing plate is provided with a second cylinder, and a movable end of the second cylinder is connected to the second limiting plate and is used for driving the second limiting plate to reciprocate along the second direction.

7. The pre-positioning device for automobile parts before welding according to claim 6 is characterized in that: The fixing plate is provided with a plurality of rows of fixing holes along the length direction, and the second cylinder is detachably connected to the fixing plate through the fixing holes.

8. A control method for the pre-positioning device for automobile parts before welding according to any one of claims 1 to 7, characterized in that: The steps include: Controlling the first positioning assembly to clamp and position the first component in a first direction and a second direction; Control the mobile platform to cooperate with the second positioning assembly to clamp and position the second component in the first direction and the second direction; Controlling the first screw transmission assembly of the pre-positioning device to drive the movable platform to move and adjust the position of the first component, so as to position the frame-shaped part as a whole in a first direction; The linear motor controlling the pre-positioning device drives the fixing plates of each group of two second positioning assemblies to move and adjust the corresponding positions of the second components, so as to position the frame-type part as a whole in the second direction.

9. The control method of the pre-positioning device for automobile parts before welding according to claim 8 is characterized in that: The controlling the first positioning assembly to clamp and position the first component in the first direction and the second direction comprises the following steps: Control the first cylinder of the pre-positioning device to drive the first limiting plate to move, so that the first limiting plate cooperates with the first positioning pin to clamp and position the first component in a first direction; The second motor, steering gear box and second screw transmission assembly controlling the pre-positioning device cooperate to drive the bearing plates of each group of two first positioning assemblies to move and adjust the corresponding positioning plate positions to clamp and position the first component in the second direction.

10. The control method of the pre-positioning device for automobile parts before welding according to claim 8, characterized in that: The mobile platform cooperates with the second positioning assembly to clamp and position the second component in the first direction and the second direction, including the following steps: Controlling the first screw transmission assembly of the pre-positioning device to drive the mobile platform to move and adjust the position of the first positioning pin, so as to clamp and position the second component in a first direction; The second cylinder of the pre-positioning device is controlled to drive the second limiting plate to move, so that the second limiting plate cooperates with the second positioning pin to clamp and position the second component in the second direction.

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