A device suitable for hot riveting of a plurality of products

Abstract

The application discloses a device suitable for hot riveting of multiple products, comprising two three-axis moving assemblies capable of moving close to or away from each other, a riveting assembly is fixedly installed at the power output end of each three-axis moving assembly, the riveting assembly comprises a first lifting plate fixedly installed at the power output end of each three-axis moving assembly, a two-axis moving assembly is installed on the first lifting plate, a moving plate is fixedly installed at the power output end of the two-axis moving assembly, and a second hot riveting head is fixedly installed at the side surface of the first lifting plate on one side of the moving plate. The device has the beneficial effects that the first hot riveting head and the second hot riveting head in the riveting assemblies connected with the two three-axis moving assemblies capable of moving close to or away from each other are driven to move in position respectively, so that riveting of different styles of automobile B columns can be adapted.

Description

Technical Field

[0001] This invention relates to the field of automobile production and assembly technology, and in particular to a device applicable to hot riveting of multiple products. Background Technology

[0002] Automotive B-pillar products come in high-end and low-end styles, each with different hot riveting requirements. To ensure that the same equipment can adapt to the production needs of different product models, the device must be functionally flexible and compatible with the riveting points of various products. Most solutions on the market use a single device for one product, requiring the entire head to be replaced when switching between different product models, which is time-consuming and cannot meet customers' high-volume production requirements. Therefore, we provide a device suitable for hot riveting multiple products to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device applicable to hot riveting of multiple products.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A device for hot riveting of multiple products includes two three-axis moving components capable of moving close to or apart from each other. A riveting component is fixedly mounted on the power output end of each of the three-axis moving components. Each riveting component includes a first lifting plate fixedly mounted on the power output end of each of the three-axis moving components. A second-axis moving component is mounted on the first lifting plate, and a moving plate is fixedly mounted on the power output end of the second-axis moving component. A second hot riveting head is fixedly mounted on the side of the first lifting plate located on one side of the moving plate. The device uses the combination of the three-axis and two-axis moving components to move the moving plate to the riveting position and, in conjunction with the second hot riveting head, to rivet products of different heights, riveting points, and styles.

[0006] Preferably, the two-axis moving assembly includes a first lifting cylinder fixedly mounted on the first lifting plate, a second lifting plate slidably mounted on the first lifting plate and fixedly mounted on the power output end of the first lifting cylinder, a transverse moving cylinder fixedly mounted on the second lifting plate, and a first hot riveting head mounted on a moving plate fixedly mounted to the power output end of the transverse moving cylinder. The first hot riveting head is moved or moved in conjunction with the second hot riveting head to the riveting position to rivet the product by combining the first lifting cylinder and the transverse moving cylinder.

[0007] Preferably, the first lifting plate is also equipped with a positioning camera for positioning the riveting point of the first hot riveting head and the second hot riveting head, and a distance sensor for monitoring the pressing depth of the first hot riveting head and the second hot riveting head during the riveting process.

[0008] Preferably, a support component for supporting and moving the product is provided on the mounting plane below the riveting component. The support component includes a first slide rail assembly, on which a first sliding plate is provided. A first support seat for supporting the product is installed on the upper surface of the first sliding plate. A first push cylinder for moving the first sliding plate is provided on one side of the first sliding plate.

[0009] Preferably, the mounting plane of the three-axis moving component is provided with a material picking and transferring mechanism for feeding materials. The material picking and transferring mechanism includes a mounting frame, on which a gear and rack traveling component is fixedly mounted. A first linear moving module is mounted on the power output end of the gear and rack traveling component, and a clamping component for gripping products is provided on the power output end of the first linear moving module.

[0010] Preferably, the clamping assembly includes a mounting plate fixedly installed on the power output end of the first linear motion module. Several vertical plates are fixedly installed on the bottom surface of the mounting plate in an alternating pattern. A sliding rod is slidably provided on the side of each vertical plate, and the sliding rod extends through a through groove to the upper surface of the mounting plate. Several clamping cylinders adapted to and connected to the sliding rods are fixedly installed on the mounting plate. The power output of the clamping cylinders is connected to the sliding rods. A clamping post is fixedly installed at the bottom of each sliding rod.

[0011] Preferably, a clamping and placing component is provided on the mounting plane located on one side of the three-axis moving component. The clamping and placing component includes a second slide rail component. A linear module is provided inside the second slide rail component. A tray is mounted on the linear module. A support plate located above the second slide rail component is also provided on the mounting plane. A first placement rack for carrying products is provided on the upper surface of the support plate.

[0012] Preferably, a test component for testing the product is provided on the mounting plane on the other side of the three-axis moving assembly. The test component includes a second support for carrying the product, a two-axis moving module is provided on one side of the second support, and a test head is provided at the power output end of the two-axis moving module.

[0013] Preferably, the feeding assembly includes a third slide rail assembly, on which a second sliding plate is provided. A first adjusting rod is longitudinally slidably connected to the upper surface of the second sliding plate, and the first adjusting rod is connected to a first adjusting cylinder that slides thereon. A second adjusting rod is laterally slidably connected to the upper surface of the second sliding plate, and the second adjusting rod is connected to a second adjusting cylinder that slides thereon. Other components that support the product are fixedly connected to the upper surface of the second sliding plate.

[0014] Preferably, buffer posts are provided at both ends of the first slide rail assembly.

[0015] The present invention has the following advantages:

[0016] 1. This invention uses two three-axis moving components that can move closer or further apart to drive the first and second hot riveting heads in the riveting components connected to them to move their positions. This allows it to adapt to the riveting of B-pillars of different car models. Furthermore, while the three-axis moving components are moving the first hot riveting head, the two-axis moving components can also move the first hot riveting head, thereby changing the position between the first and second hot riveting heads. This adapts to multiple car B-pillar products and allows for riveting at different positions. It solves the problems of some existing devices that can only rivet one type of product and require replacing the entire head when switching to different product models, resulting in long time consumption.

[0017] 2. The present invention uses the linkage of the first lifting cylinder and the transverse cylinder to drive the first hot riveting head to move in both up and down and left and right directions, thereby changing the distance between the first hot riveting head and the second hot riveting head, so as to be able to rivet at riveting points that require different distances, thus adapting to different styles of products.

[0018] 3. This invention uses a positioning camera to take pictures to determine the points that need to be riveted, thereby improving the riveting accuracy. It also uses a distance sensor to monitor the descent distance of the first and second hot riveting heads, preventing the downward pressure distance from being too short or too long, which would affect the riveting of the product. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly state of the three-axis moving component and the riveting component of the present invention.

[0020] Figure 2 This is a schematic diagram of the riveting assembly structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the supporting component structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the overall invention.

[0023] Figure 5 This is a schematic diagram of the material handling and transfer mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the clamping assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the clamping and placement component of the present invention.

[0026] Figure 8 This is a schematic diagram of the test components of the present invention.

[0027] Figure 9 This is a schematic diagram of the feeding assembly structure of the present invention.

[0028] In the diagram, 1. Three-axis moving assembly; 2. Riveting assembly; 21. First lifting plate; 22. First lifting cylinder; 23. Second lifting plate; 24. Lateral movement cylinder; 25. Moving plate; 26. First hot riveting head; 27. Second hot riveting head; 28. Positioning camera; 29. ​​Distance sensor; 3. Bearing assembly; 31. First slide rail assembly; 32. First sliding plate; 33. First bearing seat; 34. First push cylinder; 35. Buffer column; 4. Material handling and transfer mechanism; 41. Mounting frame; 42. Gear and rack traveling assembly; 43. First linear movement module; 44. 441. Clamping assembly; 442. Mounting plate; 443. Vertical plate; 444. Sliding rod; 445. Clamping cylinder; 446. Clamping column; 5. Clamping and placing assembly; 51. Second slide rail assembly; 52. Tray; 53. Support plate; 54. First placing frame; 55. Linear module; 6. Testing assembly; 61. Two-axis moving module; 62. Detection head; 63. Second bearing seat; 7. Unloading assembly; 71. Third slide rail assembly; 72. Second sliding plate; 73. First adjusting rod; 74. First adjusting cylinder; 75. Second adjusting rod; 76. Second adjusting cylinder. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] like Figure 1 Example 9 shown:

[0032] A device for hot riveting of multiple products includes two three-axis moving components 1 capable of moving close to or apart from each other. A riveting component 2 is fixedly installed at the power output end of each of the three-axis moving components 1. The riveting component 2 includes a first lifting plate 21 fixedly installed at the power output end of each of the three-axis moving components 1. A second-axis moving component is installed on the first lifting plate 21. A moving plate 25 is fixedly installed at the power output end of the second-axis moving component. A second hot riveting head 27 is fixedly installed on the side of the first lifting plate 21 located on one side of the moving plate 25. The device moves the moving plate 25 to the riveting position by combining the three-axis moving components 1 and the two-axis moving components, and combines the second hot riveting head 27 to rivet products of different heights, rivet points, and styles.

[0033] Reference Figure 1 The three-axis moving assembly 1 drives two face-to-face riveting assemblies 2 to move closer or further apart, and can also move in three directions in space to adapt to products of different positions and heights. Each riveting assembly 2 includes a first hot riveting head 26 and a second hot riveting head 27. By moving the first hot riveting head 26 and the second hot riveting head 27 to a predetermined position, multiple riveting points can be riveted simultaneously, thereby improving efficiency and adapting to products of different specifications. This solves the problem that some existing equipment can only rivet one type of product and requires changing the riveting head when riveting different styles of products, resulting in long time consumption. The three-axis moving assembly 1 can adopt a motor screw module, a motor synchronous belt module, or a linear motor module, etc. In this embodiment, a motor screw module is used. Specifically, during lateral movement, the two three-axis moving assemblies 1 are mounted on the same mounting plate, as detailed in the attached document. Figure 1 .

[0034] The dual-axis moving assembly includes a first lifting cylinder 22 fixedly mounted on the first lifting plate 21, a second lifting plate 23 slidably mounted on the first lifting plate 21 fixedly mounted on the power output end of the first lifting cylinder 22, a transverse moving cylinder 24 fixedly mounted on the second lifting plate 23, and a first hot riveting head 26 mounted on a moving plate 25 fixedly mounted to the power output end of the transverse moving cylinder 24. The first hot riveting head 26 is moved to the riveting position by the combination of the first lifting cylinder 22 and the transverse moving cylinder 24, or by combining with the second hot riveting head 27 to rivet the product.

[0035] Reference Figure 2The three-axis moving assembly 1 enables the first hot riveting head 26 and the second hot riveting head 27 to move in three axes within the workspace. Under the coordinated movement of the first lifting cylinder 22 and the transverse cylinder 24, the first hot riveting head 26 can also move in two axes while following the three-axis moving assembly 1, thereby changing the distance between the first hot riveting head 26 and the second hot riveting head 27. This allows for the riveting of products with different spacing or heights, improving the versatility of the equipment.

[0036] Specifically, in use, the first hot riveting head 26 and the second hot riveting head 27 are first moved to the predetermined position by the three-axis moving assembly 1. When it is necessary to rivet points at different positions or different heights, the first lifting cylinder 22 can be activated to drive the second lifting plate 23, on which the first hot riveting head 26 is installed, to move and change the height. When it is necessary to move laterally to change the distance between the first hot riveting head 26 and the second hot riveting head 27, the transverse moving cylinder 24 installed on the second lifting plate 23 is activated to drive the first hot riveting head 26 installed on the moving plate 25 to move laterally, thereby changing the lateral distance between the first hot riveting head 26 and the second hot riveting head 27 on the first lifting plate 21. Then, through the linkage of the first lifting cylinder 22 and the transverse moving cylinder 24, the distance between the first hot riveting head 26 and the second hot riveting head 27 in both the height and lateral position directions can be changed, thus adapting to the riveting of different styles of products.

[0037] The first lifting plate 21 is also equipped with a positioning camera 28 for positioning the riveting point of the first hot riveting head 26 and the second hot riveting head 27, and a distance sensor 29 for monitoring the pressing depth of the first hot riveting head 26 and the second hot riveting head 27 during the riveting process.

[0038] Reference Figure 2 The positioning camera 28 takes pictures of the position to be riveted, and the processor analyzes the pictures to determine the riveting position. Then, the three-axis moving assembly 1, the first lifting cylinder 22, and the transverse moving cylinder 24 are controlled to move the first hot riveting head 26 and / or the second hot riveting head 27 to the predetermined position. The distance sensor 29 monitors the distance between the first hot riveting head 26 and the second hot riveting head 27 in real time to prevent the first hot riveting head 26 and the second hot riveting head 27 from damaging the product due to too low pressure or from being too high to perform riveting.

[0039] A support component 3 for supporting and moving the product is provided on the mounting plane below the riveting component 2. The support component 3 includes a first slide rail component 31, a first sliding plate 32 is provided on the first slide rail component 31, and a first support seat 33 for supporting the product is installed on the upper surface of the first sliding plate 32. A first push cylinder 34 for moving the first sliding plate 32 is provided on one side of the first sliding plate 32, and buffer posts 35 are provided at both ends of the first slide rail component 31.

[0040] See Figure 3 The product is placed on the first support seat 33. The first push cylinder 34 is activated to drive the first sliding plate 32 to move on the first slide rail assembly 31, thereby moving the first support seat 33 to a predetermined position. The product on the first support seat 33 can then be transferred to the predetermined position. The buffer column 35 reduces the impact force of the first sliding plate 32 when it stops, making its movement more stable.

[0041] The three-axis moving assembly 1 is provided with a material picking and transferring mechanism 4 for feeding materials on its mounting plane. The material picking and transferring mechanism 4 includes a mounting frame 41, on which a gear and rack traveling assembly 42 is fixedly mounted. A first linear moving module 43 is mounted on the power output end of the gear and rack traveling assembly 42, and a clamping assembly 44 for gripping products is provided on the power output end of the first linear moving module 43.

[0042] The clamping assembly 44 includes a mounting plate 441 fixedly installed on the power output end of the first linear motion module 43. Several vertical plates 442 are fixedly installed on the bottom surface of the mounting plate 441 in an alternating manner. Each vertical plate 442 has a sliding rod 443 slidably arranged on its side, and the sliding rod 443 extends through a through groove to the upper surface of the mounting plate 441. Several clamping cylinders 444 adapted to and connected to the sliding rods 443 are fixedly installed on the mounting plate 441. The power output of the clamping cylinders 444 is connected to the sliding rods 443. A clamping post 445 is fixedly installed at the bottom of each sliding rod 443.

[0043] Reference Figures 4 to 6 As shown, when the product needs to be transferred, the rack and pinion traveling assembly 42 is first activated to drive the first linear motion module 43 and the clamping assembly 44 to move. The first linear motion module 43 drives the clamping assembly 44 to move up and down. The linkage between the rack and pinion traveling assembly 42 and the first linear motion module 43 enables the clamping assembly 44 to move in the horizontal and vertical directions. When the clamping assembly 44 moves to the product to be gripped, multiple clamping cylinders 444 are first activated to drive the sliding rod 443 connected to their power output end to move, causing the clamping column 445 to move towards the product, thereby clamping the product. For details, refer to... Figure 6 Multiple clamping cylinders 444 are distributed on both sides of the mounting plate 441. More specifically, there are two on one side and one on the other side, thus forming a triangle, so that the product is clamped between the clamping columns 445 distributed in a triangle.

[0044] A clamping and placing assembly 5 is provided on the mounting plane located on one side of the three-axis moving assembly 1. The clamping and placing assembly 5 includes a second slide rail assembly 51. A linear module 55 is provided inside the second slide rail assembly 51. A tray 52 is mounted on the linear module 55. A support plate 53 is also provided on the mounting plane above the second slide rail assembly 51. A first placement rack 54 for carrying products is provided on the upper surface of the support plate 53.

[0045] Reference Figure 7 As shown, when in use, the linear module 55 is first activated to move the tray 52 to the end of the second slide rail assembly 51. The material handling and transfer mechanism 4 places the product into the tray 52. ​​Then, the linear module 55 moves the tray 52 containing the product to the support plate 53. Next, the product is manually placed on the first placement rack 54 for use in the next process.

[0046] On the mounting plane of the other side of the three-axis moving assembly 1, there is a test assembly 6 for testing products. The test assembly 6 includes a second support 63 for carrying the product. A two-axis moving module 61 is provided on one side of the second support 63. A test head 62 is provided at the power output end of the two-axis moving module 61.

[0047] Reference Figure 8 As shown, after the riveting assembly 2 rivets the product, the product is manually transferred to the second carrier 63. The two-axis moving module 61 is activated to drive the detection head 62 to move to the predetermined position to detect the product located on the second carrier 63. This can detect whether the product is successfully riveted or perform other functional tests. Only different detection heads 62 need to be replaced. In this embodiment, the NFC component is specifically detected. Products that fail the test are transferred to the adjacent defective product box (not shown in the figure).

[0048] The feeding assembly 7 includes a third slide rail assembly 71, on which a second sliding plate 72 is provided. A first adjusting rod 73 is longitudinally slidably connected to the upper surface of the second sliding plate 72. The first adjusting rod 73 is connected to a first adjusting cylinder 74 that allows it to slide. A second adjusting rod 75 is laterally slidably connected to the upper surface of the second sliding plate 72. The second adjusting rod 75 is connected to a second adjusting cylinder 76 that allows it to slide. Other components that support the product are fixedly connected to the upper surface of the second sliding plate 72.

[0049] Reference Figure 9When the product transferred by the material handling mechanism 4 does not require riveting, the material handling mechanism 4 can directly place the product into the unloading component 7. Specifically, by activating the first adjusting cylinder 74 and the second adjusting cylinder 76, the first adjusting rod 73 and the second adjusting rod 75 are moved to the predetermined positions, thereby accommodating products of different sizes. After the product that does not require riveting is placed, the linear motion component connected to the second sliding plate 72, specifically the motor screw assembly, drives the product on the second sliding plate 72 to move. Other linear drive components can also be used.

[0050] The working process of this invention is as follows: First, the product to be hot-riveted is transferred to the clamping and placing component 5 by the material handling and transfer mechanism 4. The product is then manually moved from the clamping and placing component 5 to the bearing component 3. Then, the three-axis moving component 1 is activated or combined with the first lifting cylinder 22 and the transverse moving cylinder 24 to move the first hot riveting head 26 and / or the second hot riveting head 27 to a predetermined position to rivet the product. After the product is riveted, the product is manually placed in the testing component 6 for testing. Products that fail the test are placed in the defective product box, or qualified products are placed in the qualified product box. When the material handling and transfer mechanism 4 is transferring a product that does not need to be riveted, the product can be transferred and placed in the unloading component 7 by the material handling and transfer mechanism 4.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for hot riveting of multiple products, comprising two three-axis moving components (1) capable of moving close to or apart from each other, characterized in that: Each of the three-axis moving components (1) has a riveting component (2) fixedly installed at its power output end. The riveting component (2) includes a first lifting plate (21) fixedly installed at the power output end of each of the three-axis moving components (1). A two-axis moving component is installed on the first lifting plate (21). A moving plate (25) is fixedly installed at the power output end of the two-axis moving component. A second hot riveting head (27) is fixedly installed on the side of the first lifting plate (21) located on one side of the moving plate (25). The moving plate (25) is moved to the riveting position by combining the three-axis moving component (1) and the two-axis moving component, and the second hot riveting head (27) is used to rivet products of different heights, rivet points and styles.

2. The device for hot riveting of multiple products according to claim 1, characterized in that: The two-axis moving assembly includes a first lifting cylinder (22) fixedly installed on the first lifting plate (21), a second lifting plate (23) slidably installed on the first lifting plate (21) at the power output end of the first lifting cylinder (22), a transverse cylinder (24) fixedly installed on the second lifting plate (23), and a first hot riveting head (26) installed on a moving plate (25) fixedly installed with the power output end of the transverse cylinder (24). The first hot riveting head (26) is moved or moved to the riveting position by combining the first lifting cylinder (22) and the transverse cylinder (24) to rivet the product.

3. The device for hot riveting of multiple products according to claim 1 or 2, characterized in that: The first lifting plate (21) is also equipped with a positioning camera (28) for positioning the riveting point of the first hot riveting head (26) and the second hot riveting head (27) and a distance sensor (29) for monitoring the pressing depth of the first hot riveting head (26) and the second hot riveting head (27) during the riveting process.

4. The device for hot riveting of multiple products according to claim 1, characterized in that: A support component (3) for carrying and moving the product is provided on the mounting plane below the riveting component (2). The support component (3) includes a first slide rail component (31), a first sliding plate (32) is provided on the first slide rail component (31), and a first support seat (33) for carrying the product is installed on the upper surface of the first sliding plate (32). A first push cylinder (34) for moving the first sliding plate (32) is provided on one side of the first sliding plate (32).

5. The device for hot riveting of multiple products according to claim 1, characterized in that: The three-axis moving assembly (1) is provided with a material picking and transferring mechanism (4) for feeding materials on its mounting plane. The material picking and transferring mechanism (4) includes a mounting frame (41). A gear and rack walking assembly (42) is fixedly installed on the mounting frame (41). A first linear moving module (43) is installed at the power output end of the gear and rack walking assembly (42). A clamping assembly (44) for picking up products is provided at the power output end of the first linear moving module (43).

6. The device for hot riveting of multiple products according to claim 5, characterized in that: The clamping assembly (44) includes a mounting plate (441) fixedly installed on the power output end of the first linear motion module (43). Several vertical plates (442) are fixedly installed on the bottom surface of the mounting plate (441) in an alternating manner. Each vertical plate (442) has a sliding rod (443) slidably arranged on its side. The sliding rod (443) extends through the through groove to the upper surface of the mounting plate (441). Several clamping cylinders (444) adapted to and connected to the sliding rods (443) are fixedly installed on the mounting plate (441). The power output of the clamping cylinders (444) is connected to the sliding rods (443). A clamping post (445) is fixedly installed at the bottom of each sliding rod (443).

7. The device for hot riveting of multiple products according to claim 1, characterized in that: A clamping and placing assembly (5) is provided on the mounting plane on one side of the three-axis moving assembly (1). The clamping and placing assembly (5) includes a second slide rail assembly (51). A linear module (55) is provided inside the second slide rail assembly (51). A tray (52) is mounted on the linear module (55). A support plate (53) is also provided on the mounting plane above the second slide rail assembly (51). A first placement rack (54) for carrying products is provided on the upper surface of the support plate (53).

8. The device for hot riveting of multiple products according to claim 1, characterized in that: On the mounting plane on the other side of the three-axis moving assembly (1), a test assembly (6) for testing products is provided. The test assembly (6) includes a second support (63) for carrying products. A two-axis moving module (61) is provided on one side of the second support (63). A test head (62) is provided at the power output end of the two-axis moving module (61).

9. The device for hot riveting of multiple products according to claim 1, characterized in that: The feeding assembly (7) includes a third slide rail assembly (71), on which a second sliding plate (72) is provided. A first adjusting rod (73) is longitudinally slidably connected to the upper surface of the second sliding plate (72). The first adjusting rod (73) is connected to a first adjusting cylinder (74) that makes it slide. A second adjusting rod (75) is laterally slidably connected to the upper surface of the second sliding plate (72). The second adjusting rod (75) is connected to a second adjusting cylinder (76) that makes it slide. Other components that support the product are fixedly connected to the upper surface of the second sliding plate (72).

10. The device for hot riveting of multiple products according to claim 4, characterized in that: The first slide rail assembly (31) has buffer posts (35) at both ends.

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