Edge rolling structure capable of ensuring appearance quality of rolled edge and use method of edge rolling structure

Abstract

The invention relates to the technical field of automobile manufacturing, and discloses a rolloff structure capable of guaranteeing rolloff appearance quality, which comprises a die lower body, a roller head mechanism and a positioning gripper, the die lower body comprises a moulding bed for placing a door assembly and a foundation plate for mounting the moulding bed, a plurality of thickness limiting blocks and an adjusting mechanism for controlling the thickness limiting blocks to move are arranged on the foundation plate near the position where the thickness of the rolled edge of the door assembly changes, when the plate thickness of the door assembly changes, the adjusting mechanism drives the thickness limiting blocks to abut against the moulding bed and abut against the door assembly, and the upper vertex of each thickness limiting block is higher than the upper vertex of the moulding bed and is as high as the door assembly. The rolling head mechanism firstly presses the thickness limiting block when rolling the edge of the door assembly. The invention further discloses a using method of the hemming structure capable of guaranteeing the hemming appearance quality. According to the edge rolling structure capable of guaranteeing the edge rolling appearance quality and the using method of the edge rolling structure, it is guaranteed that high-speed, high-efficiency and high-quality edge rolling can be kept when the plate thickness changes in the edge rolling process of a door assembly.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a piping structure for ensuring the appearance quality of the piping and a use method thereof. Background Art

[0002] In the existing hemming tooling, when the total plate thickness changes during the hemming process, low-speed hemming + robot special posture response is used, which not only affects the beat, but also leads to poor hemming quality, and the robot teaching is also very difficult.

[0003] In addition, the outer plate positioning uses several cylinders to drive the limit blocks for positioning. When the roller head is about to arrive, the front positioning is driven to open by the cylinder to ensure the smooth passage of the roller head. When the roller head passes, the positioning is restored again. This method requires the arrangement of several cylinder mechanisms and air valves around the fetal membrane. Not only is the hardware redundancy cost very high, but the software control is also difficult. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a rolling structure and a method of use thereof that ensure the appearance quality of the rolling, so as to ensure that the door assembly can maintain high-speed, high-efficiency and high-quality rolling when the plate thickness changes during the rolling process.

[0005] To achieve the above-mentioned purpose, the present invention is a rolling structure designed to ensure the appearance quality of the rolling, including a mold lower body, a roller head mechanism and a positioning gripper, the mold lower body includes a tire mold for placing the door assembly and a base plate for installing the tire mold, and a plurality of thickness limiting blocks and an adjustment mechanism for controlling the movement of the thickness limiting blocks are provided on the base plate near the position where the thickness of the rolling of the door assembly changes. When the thickness of the door assembly changes, the adjustment mechanism drives the thickness limiting block to press against the tire mold and close to the door assembly, and the upper vertex of the thickness limiting block is higher than the upper vertex of the tire mold and is at the same height as the door assembly, and the roller head mechanism first presses on the thickness limiting block when rolling the door assembly.

[0006] Preferably, the adjustment mechanism includes a self-locking four-bar linkage and an adjusting cylinder, the self-locking four-bar linkage includes a first link fixedly mounted on the side of the tire mold, the bottom of the first link is hinged to an angle of a triangular link, the top of the first link is hinged to a second link, the other end of the second link is hinged to a third link, the other end of the third link is hinged to another angle of the triangular link, the third angle of the triangular link is hinged to the piston rod of the adjusting cylinder, the body of the adjusting cylinder is hinged to the bottom of the base plate, and the thickness limiting block is fixedly mounted on the second link.

[0007] Preferably, a limiting bolt is provided on the first connecting rod or the third connecting rod or the triangular connecting rod. When the hinge points on the triangular connecting rod with the first connecting rod and the second connecting rod are collinear with the two hinge points on the third connecting rod, the self-locking four-link stops moving under the action of the limiting bolt, and the thickness limiting block is at the same height as the door assembly.

[0008] Preferably, a first limit block is provided above the first connecting rod towards the position of the second connecting rod, a second limit block corresponding to the first limit block is provided on the second connecting rod, a vertical groove is provided on the first limit block, and a convex strip corresponding to the groove is provided on the second limit block, and when the thickness limiting block is against the tire mold and close to the door assembly, the first limit block and the second limit block are stuck in place.

[0009] Preferably, the positioning gripper includes a positioning frame and an automatic switching tool connected to a robot on the production line, the lower surface of the positioning frame is provided with a plurality of pressure heads and positioning pins for fixing the door assembly, and the positioning frame is mounted on the base plate via a positioning cylinder.

[0010] Preferably, the tire mold is provided with a step for the thickness limiting block to be inserted into, the tire mold is provided with a plurality of vacuum suction cups for fixing the door assembly, the tire mold is provided with external positioning plates for positioning the door assembly around it, and the mold surface of the tire mold is consistent with the mold surface of the door assembly and the contours are flush.

[0011] Preferably, a plurality of skids that fit with the mold transport device are provided at the lower portion of the base plate, and a towing arm for towing the mold transport device is provided on the base plate.

[0012] Preferably, the outer positioning plate includes an outer shell connected to the tire mold, the interior of the outer shell is a cavity with an upper opening, a telescopic positioning device is provided in the outer shell, the telescopic positioning device includes a telescopic plate arranged in the inner shell and a positioning protrusion located above the telescopic plate, the telescopic plate is provided with two vertical oblong holes, the outer shell is provided with circular holes corresponding to the two oblong holes, two limit pins are respectively inserted into the circular holes and the oblong holes so that the telescopic plate can rotate inside the outer shell around the limit pins at the rear of the roller head mechanism in the direction of travel, a vertical return spring is also provided in the outer shell, one end of the return spring abuts against the bottom of the inner cavity of the outer shell, and the other end abuts against the lower surface of the telescopic plate, the positioning protrusion is a flat surface close to the door assembly side, and the other side is an arc-shaped surface.

[0013] A method for using a rolling structure to ensure the appearance quality of the rolling, when the thickness limiting block is not needed to limit the rolling head mechanism to the door assembly, the adjustment mechanism drives the thickness limiting block to separate from the tire mold and the door assembly, and the rolling head mechanism performs rolling on the door assembly according to the existing process;

[0014] When the plate thickness changes during the rolling process, the adjustment mechanism drives the thickness limiting block to press against the tire mold and close to the door assembly, and the upper vertex of the thickness limiting block is higher than the upper vertex of the tire mold and is at the same height as the door assembly. The roller head mechanism first presses on the thickness limiting block when rolling the door assembly.

[0015] Preferably, the tire mold is provided with an outer positioning plate for positioning the door assembly around the tire mold, the outer positioning plate includes a shell connected to the tire mold, the interior of the shell is a cavity with an upper opening, a telescopic positioning device is provided in the shell, the telescopic positioning device includes a telescopic plate arranged in the shell and a positioning protrusion located above the telescopic plate, two oblong holes are provided on the telescopic plate, the shell is provided with a circular hole corresponding to the two oblong holes, two limit pins are respectively inserted into the circular hole and the oblong hole so that the telescopic plate can rotate around the limit pin at the rear of the roller head mechanism in the direction of travel inside the shell, a vertical return spring is also provided in the shell, one end of the return spring abuts against the bottom of the cavity inside the shell, and the other end abuts against the lower surface of the telescopic plate, the positioning protrusion is a flat surface close to the door assembly side, and the other side is an arc-shaped surface;

[0016] When the roller head mechanism rolls over the outer panel to position, the roller head mechanism pushes the positioning protrusion to rotate around the limit pin at the rear of the roller head mechanism's travel direction to press the positioning protrusion down until it does not affect the movement of the roller head mechanism. When the roller head mechanism passes, the return spring pushes the positioning protrusion to return to its original position and continue to position the door assembly.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The hemming mechanism can ensure that the door assembly can maintain high speed, high efficiency and high quality hemming when the thickness of the plate changes during the hemming process;

[0019] 2. When the plate thickness changes, the roller head mechanism first presses on the thickness limit block when rolling the door assembly. The thickness of the door assembly rolling is ultimately determined by the thickness limit block, so it will not collapse;

[0020] 3. When there is no need to limit the rolling of the door assembly by the roller head mechanism, the roller head mechanism can pass through the gap between the tire mold and the thickness limiting block without any obstacles, and will not affect the normal rolling speed;

[0021] 4. By setting the telescopic positioning device, the movement of the roller head mechanism is not affected;

[0022] 5. Simple structure, low cost, small size, light weight and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A schematic diagram of the structure of the piping structure for ensuring the appearance quality of the piping according to the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the lower body of the middle mold;

[0025] Figure 3 for Figure 1 A top view of

[0026] Figure 4 for Figure 3 Schematic diagram of the cutaway at AA in the middle;

[0027] Figure 5 for Figure 4 A magnified view of the location of the mid-thickness block;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the adjustment mechanism;

[0029] Figure 7 This is a schematic diagram of the structure of the self-locking four-link in the present invention when it is closed;

[0030] Figure 8 for Figure 7 Schematic diagram from another perspective;

[0031] Fig. 9 for Figure 1 Schematic diagram of the structure of the Chinese and foreign positioning plate;

[0032] Fig.10 for Figure 1 Schematic diagram of the internal structure of the Chinese and foreign positioning board.

[0033] The components in the figure are numbered as follows:

[0034] Mold lower body 1, roller head mechanism 2, positioning gripper 3, door assembly 4, tire mold 5, base plate 6, thickness limit block 7, adjustment mechanism 8, self-locking four-link 9, adjustment cylinder 10, first connecting rod 11, triangular connecting rod 12, second connecting rod 13, third connecting rod 14, limit bolt 15, first limit block 16, second limit block 17, groove 18, convex strip 19, positioning frame 20, automatic switching tool 21, pressure head 22, positioning pin 23, positioning cylinder 24, step 25, vacuum suction cup 26, outer positioning plate 27, skid 28, drag arm 29, shell 30, telescopic positioning device 31, telescopic plate 32, positioning protrusion 33, oblong hole 34, round hole 35, limit pin 36, reset spring 37. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1, Figure 2 and Figure 3 As shown, a rolling structure for ensuring the appearance quality of the rolling includes a mold lower body 1, a rolling head mechanism 2 and a positioning gripper 3. The mold lower body 1 includes a tire mold 5 for placing a door assembly 4 and a base plate 6 for installing the tire mold 5. A plurality of thickness limiting blocks 7 and an adjustment mechanism 8 for controlling the movement of the thickness limiting blocks 7 are provided on the base plate 6 near the position where the thickness of the rolling of the door assembly 4 changes. When the thickness of the door assembly 4 changes, the adjustment mechanism 8 drives the thickness limiting block 7 to press against the tire mold 5 and close to the door assembly 4, and the upper vertex of the thickness limiting block 7 is higher than the upper vertex of the tire mold 5 and is at the same height as the door assembly 4. The rolling head mechanism 2 first presses on the thickness limiting block 7 when rolling the door assembly 4.

[0037] Among them, Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the adjustment mechanism 8 includes a self-locking four-link 9 and an adjusting cylinder 10. The self-locking four-link 9 includes a first link 11 fixedly mounted on the side of the tire mold 5. The bottom of the first link 11 is hinged to one corner of the triangular link 12. The top of the first link 11 is hinged to a second link 13. The other end of the second link 13 is hinged to a third link 14. The other end of the third link 14 is hinged to another corner of the triangular link 12. The third corner of the triangular link 12 is hinged to the piston rod of the adjusting cylinder 10. The body of the adjusting cylinder 10 is hinged to the bottom of the base plate 6. The thickness limiting block 7 is fixedly mounted on the second link 13.

[0038] In addition, a limiting bolt 15 is provided on the first connecting rod 11 or the third connecting rod 14 or the triangular connecting rod 12. When the hinge points on the triangular connecting rod 12 with the first connecting rod 11 and the second connecting rod 13 are collinear with the two hinge points on the third connecting rod 14, the self-locking four-link 9 stops moving under the action of the limiting bolt 15, and the thickness limiting block 7 is at the same height as the door assembly 4. When the self-locking four-link 9 is opened, the roller head mechanism 2 can pass through the gap formed between the tire mold 5 and the thickness limiting block 7 without obstacles.

[0039] In this embodiment, a first limit block 16 is provided above the first connecting rod 11 and toward the second connecting rod 13, a second limit block 17 corresponding to the first limit block 16 is provided on the second connecting rod 13, a vertical groove 18 is provided on the first limit block 16, and a convex strip 19 corresponding to the groove 18 is provided on the second limit block 17. When the thickness limiting block 7 is against the tire mold 5 and close to the door assembly 4, the first limit block 16 and the second limit block 17 are stuck in place, which can play a guiding role and prevent the self-locking four-link 9 from being displaced in the left and right directions.

[0040] In this embodiment, the positioning gripper 3 includes a positioning frame 20 and an automatic switching tool 21 connected to the robot on the production line. The lower surface of the positioning frame 20 is provided with a plurality of pressure heads 22 and positioning pins 23 for fixing the door assembly 4. The positioning frame 20 is installed on the base plate 6 through a positioning cylinder 24.

[0041] In this embodiment, a step 25 is provided on the tire mold 5 for the limiting thick block 7 to be inserted into, a plurality of vacuum suction cups 26 for fixing the door assembly 4 are provided inside the tire mold 5, and an outer positioning plate 27 for positioning the door assembly 4 is provided around the tire mold 5. The profile of the tire mold 5 is consistent with the profile of the door assembly 4, and the contours are flush.

[0042] In this embodiment, a plurality of skids 28 that fit with the mold transport device are provided at the lower portion of the base plate 6, so that the present invention can automatically switch between different vehicle models, and a towing arm 29 for towing the mold transport device is provided on the base plate 6.

[0043] Finally, if Fig. 9 and Fig.10 As shown, the outer positioning plate 27 includes a shell 30 connected to the tire mold 5, the interior of the shell 30 is a cavity with an upper opening, and a telescopic positioning device 31 is provided in the shell 30. The telescopic positioning device 31 includes a telescopic plate 32 arranged in the shell 30 and a positioning protrusion 33 located above the telescopic plate 32. The telescopic plate 32 is provided with two vertical oblong holes 34, and the shell 30 is provided with a circular hole 35 corresponding to the two oblong holes 34. Two limit pins 36 are respectively inserted into the circular holes 35 and the oblong holes 34 so that the telescopic plate 32 can rotate around the limit pins 36 at the rear of the roller head mechanism 2 in the direction of travel inside the shell 30. A vertical return spring 37 is also provided in the shell 30, one end of the return spring 37 abuts against the bottom of the internal cavity of the shell 30, and the other end abuts against the lower surface of the telescopic plate 32. The positioning protrusion 33 is flat on the side close to the door assembly 4 for limiting, and the other side is an arc-shaped surface, which is convenient for the roller head mechanism 2 to pass smoothly when rolling.

[0044] When the hemming structure of this embodiment that ensures the hemming appearance quality is used, when the thickness limiting block 7 is not needed to limit the rolling head mechanism 2 from hemming the door assembly 4, the adjustment mechanism 8 drives the thickness limiting block 7 to separate from the tire mold 5 and the door assembly 4, and the rolling head mechanism 2 performs hemming on the door assembly 4 according to the existing process;

[0045] When the plate thickness changes during the rolling process, the adjustment mechanism 8 drives the thickness limiting block 7 to press against the tire mold 5 and close to the door assembly 4, and the upper vertex of the thickness limiting block 7 is higher than the upper vertex of the tire mold 5 and is at the same height as the door assembly 4. The rolling head mechanism 2 first presses on the thickness limiting block 7 when rolling the door assembly 4.

[0046] In addition, when the roller head mechanism 2 rolls over the outer plate positioning 27, the roller head mechanism 2 pushes the positioning protrusion 33 to rotate around the limit pin 36 at the rear of the roller head mechanism 2 in the direction of travel to press the positioning protrusion 33 down until it does not affect the movement of the roller head mechanism 2. When the roller head mechanism 2 passes, the reset spring 37 pushes the positioning protrusion 33 to return to its original position to continue positioning the door assembly 4.

[0047] The present invention provides a hemming structure and a method of using the same for ensuring the appearance quality of the hemming. The hemming mechanism 2 can ensure that the door assembly 4 can maintain high-speed, high-efficiency and high-quality hemming when the plate thickness changes during the hemming process. When the plate thickness changes, the roller head mechanism 2 first presses on the thickness limiting block 7 when hemming the door assembly 4, and the hemming thickness of the door assembly 4 is ultimately determined by the thickness limiting block 7, so it will not be crushed. When there is no need to limit the roller head mechanism 2 from hemming the door assembly, the roller head mechanism 2 can pass through the gap formed between the tire mold 5 and the thickness limiting block 7 without affecting the normal hemming speed. By setting the telescopic positioning device 31, the movement of the roller head mechanism 2 is not affected. The structure is simple, the cost is low, the size is small, the weight is light, and it is easy to use.

[0048] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0049] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0050] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A rolling structure for ensuring the appearance quality of the rolling, comprising a mold lower body (1), a rolling head mechanism (2) and a positioning gripper (3), wherein the mold lower body (1) comprises a tire mold (5) for placing a door assembly (4) and a base plate (6) for installing the tire mold (5), characterized in that: A plurality of thickness limiting blocks (7) and an adjustment mechanism (8) for controlling the movement of the thickness limiting blocks (7) are provided on the base plate (6) near the position where the thickness of the edge rolling of the door assembly (4) changes. When the thickness of the door assembly (4) changes, the adjustment mechanism (8) drives the thickness limiting blocks (7) to press against the tire mold (5) and close to the door assembly (4), and the upper vertex of the thickness limiting blocks (7) is higher than the upper vertex of the tire mold (5) and is at the same height as the door assembly (4). When the roller head mechanism (2) rolls the door assembly (4), it first presses on the thickness limiting blocks (7).

2. The piping structure for ensuring the appearance quality of piping according to claim 1, characterized in that: The adjustment mechanism (8) comprises a self-locking four-bar linkage (9) and an adjustment cylinder (10), wherein the self-locking four-bar linkage (9) comprises a first link (11) fixedly mounted on the side of the tire mold (5), the bottom of the first link (11) is hinged to one corner of a triangular link (12), the top of the first link (11) is hinged to a second link (13), the other end of the second link (13) is hinged to a third link (14), the other end of the third link (14) is hinged to another corner of the triangular link (12), the third corner of the triangular link (12) is hinged to the piston rod of the adjustment cylinder (10), the body of the adjustment cylinder (10) is hinged below the base plate (6), and the thickness limiting block (7) is fixedly mounted on the second link (13).

3. The piping structure for ensuring the appearance quality of piping according to claim 2, characterized in that: A limiting bolt (15) is provided on the first connecting rod (11) or the third connecting rod (14) or the triangular connecting rod (12). When the hinge points on the triangular connecting rod (12) with the first connecting rod (11) and the second connecting rod (13) are collinear with the two hinge points on the third connecting rod (14), the self-locking four-link rod (9) stops moving under the action of the limiting bolt (15), and the thickness limiting block (7) is at the same height as the door assembly (4).

4. The piping structure for ensuring the appearance quality of piping according to claim 2, characterized in that: A first limit block (16) is provided above the first connecting rod (11) and toward the second connecting rod (13); a second limit block (17) corresponding to the first limit block (16) is provided on the second connecting rod (13); a vertical groove (18) is provided on the first limit block (16); a convex strip (19) corresponding to the groove (18) is provided on the second limit block (17); when the thickness limiting block (7) abuts against the tire mold (5) and is close to the door assembly (4), the first limit block (16) and the second limit block (17) are locked in place.

5. The piping structure for ensuring the appearance quality of piping according to claim 1, characterized in that: The positioning gripper (3) comprises a positioning frame (20) and an automatic switching tool (21) connected to a robot on a production line. The lower surface of the positioning frame (20) is provided with a plurality of pressure heads (22) and positioning pins (23) for fixing the door assembly (4). The positioning frame (20) is mounted on the base plate (6) via a positioning cylinder (24).

6. The piping structure for ensuring the appearance quality of piping according to claim 2, characterized in that: The mold (5) is provided with a step (25) for the thickness limiting block (7) to be inserted into, the mold (5) is provided with a plurality of vacuum suction cups (26) for fixing the door assembly (4), and the mold (5) is provided with external positioning plates (27) for positioning the door assembly (4) around the mold (5), and the mold surface of the mold (5) is consistent with the mold surface of the door assembly (4), and the contours are flush.

7. The piping structure for ensuring the appearance quality of piping according to claim 1, characterized in that: A plurality of skids (28) that fit with the mold transport device are provided at the lower part of the base plate (6), and a towing arm (29) for towing the mold transport device is provided on the base plate (6).

8. The piping structure for ensuring the appearance quality of piping according to claim 6, characterized in that: The outer positioning plate (27) comprises a shell (30) connected to the tire mold (5), the interior of the shell (30) is a cavity with an upper opening, a telescopic positioning device (31) is provided in the shell (30), the telescopic positioning device (31) comprises a telescopic plate (32) arranged inside the shell (30) and a positioning protrusion (33) located above the telescopic plate (32), the telescopic plate (32) is provided with two vertical oblong holes (34), and the shell (30) is provided with round holes (35) corresponding to the two oblong holes (34). ), two limit pins (36) are respectively inserted into the circular hole (35) and the oblong hole (34) so ​​that the telescopic plate (32) can rotate inside the shell (30) around the limit pin (36) at the rear of the roller head mechanism (2) in the direction of travel, and a vertical return spring (37) is also provided inside the shell (30), one end of the return spring (37) abuts against the bottom of the internal cavity of the shell (30), and the other end abuts against the lower surface of the telescopic plate (32), and the positioning protrusion (33) is a flat surface on the side close to the door assembly (4), and an arc-shaped surface on the other side.

9. A method for using the piping structure for ensuring the appearance quality of the piping as claimed in claim 1, characterized in that: When the thickness limiting block (7) is no longer needed to limit the rolling head mechanism (2) from rolling the door assembly (4), the adjustment mechanism (8) drives the thickness limiting block (7) to separate from the tire mold (5) and the door assembly (4), and at this time, the rolling head mechanism (2) rolls the door assembly (4) according to the existing process; When the plate thickness changes during the rolling process, the adjustment mechanism (8) drives the thickness limiting block (7) to press against the tire mold (5) and close to the door assembly (4), and the upper vertex of the thickness limiting block (7) is higher than the upper vertex of the tire mold (5) and is at the same height as the door assembly (4). When the roller head mechanism (2) rolls the door assembly (4), it first presses on the thickness limiting block (7).

10. The method for using the piping structure for ensuring the appearance quality of the piping according to claim 9, characterized in that: The tire mold (5) is provided with an outer positioning plate (27) around it for positioning the door assembly (4), the outer positioning plate (27) includes a shell (30) connected to the tire mold (5), the interior of the shell (30) is a cavity with an upper opening, a telescopic positioning device (31) is provided in the shell (30), the telescopic positioning device (31) includes a telescopic plate (32) arranged inside the shell (30) and a positioning protrusion (33) located above the telescopic plate (32), the telescopic plate (32) is provided with two vertical oblong holes (34), and the shell (30) is provided with a positioning protrusion (33) connected to the two vertical oblong holes (34) and the outer shell (30) is provided with a positioning protrusion (33) connected to the two vertical oblong holes (34) and the outer shell (30) is provided with a positioning protrusion (33) located above the telescopic plate (32). The oblong hole (34) corresponds to a circular hole (35), and two limit pins (36) are respectively inserted into the circular hole (35) and the oblong hole (34) so ​​that the telescopic plate (32) can rotate inside the shell (30) around the limit pin (36) at the rear of the roller head mechanism (2) in the direction of travel. A vertical return spring (37) is also provided inside the shell (30), and one end of the return spring (37) abuts against the bottom of the internal cavity of the shell (30), and the other end abuts against the lower surface of the telescopic plate (32). The positioning protrusion (33) is flat on the side close to the door assembly (4), and is an arc-shaped surface on the other side; When the roller head mechanism (2) rolls over the outer panel positioning (27), the roller head mechanism (2) pushes the positioning protrusion (33) to rotate around the limit pin (36) at the rear of the moving direction of the roller head mechanism (2) to press the positioning protrusion (33) down until it does not affect the movement of the roller head mechanism (2); when the roller head mechanism (2) passes, the return spring (37) pushes the positioning protrusion (33) to return to its original position and continue to position the door assembly (4).

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