A board fixing platform for wood box processing

Abstract

The utility model relates to a board fixed platform for wooden box processing. Including installation chassis, the movable installation of installation bench is established on it, and the angle adjusting device is installed between installation chassis and installation bench, the top of installation bench is fixedly connected with the adjusting installation frame, and the left station and right station that distribute according to left and right are set up on adjusting installation frame, the left fixed device is set up at left station, the right fixed device is set up at right station, the support positioning device that installs on installation bench is set up below left fixed device, left fixed device includes left clamping unit one and left clamping unit two of adjustable left and right spacing and installs on adjusting installation frame, right fixed device includes right clamping unit one and right clamping unit two of adjustable left and right spacing and installs on adjusting installation frame. The utility model adopts double station fixed board to be processed, is favorable to the improvement processing efficiency, and can adjust the angle of board when processing, improves practicality.

Description

Technical Field

[0001] This utility model belongs to the field of board processing technology, and in particular relates to a board fixing platform for wooden box processing. Background Technology

[0002] Wooden crates are rectangular packaging containers made of wood, bamboo, or wood-based composites. They are among the oldest and most important types of transport packaging containers, playing a crucial role in the packaging world due to their simplicity, high strength, availability of locally sourced materials, durability, elasticity, ability to withstand impacts and vibrations, and relatively low cost.

[0003] In the production of wooden crates, the boards used for assembling the crates need to be processed. During this process, fixing devices are used to position and secure the boards. However, most existing board processing fixing devices have a relatively simple structure and cannot adjust the angle of the boards during processing, thus reducing their practicality. Furthermore, existing board processing fixing devices have a single workstation, allowing only one workpiece to be clamped and processed at a time, impacting work efficiency. Therefore, there is an urgent need to design a board fixing platform for wooden crate processing to solve these problems. Utility Model Content

[0004] This invention provides a structurally sound board fixing platform for wooden box processing, addressing technical problems existing in prior art. This invention employs a dual-station design to fix the boards to be processed, which improves processing efficiency and allows for angle adjustment of the boards during processing, enhancing its practicality.

[0005] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A board fixing platform for wooden box processing includes a mounting base, a mounting frame movably mounted on the mounting base, an angle adjustment device installed between the mounting base and the mounting frame for adjusting the flip angle of the mounting frame; an adjustable mounting frame is fixedly connected to the top of the mounting frame, and a left workstation and a right workstation are provided on the adjustable mounting frame; a left fixing device is provided at the left workstation for clamping and fixing the board; a right fixing device is provided at the right workstation for clamping and fixing the board; a support positioning device is provided below the left fixing device and mounted on the mounting frame for supporting and positioning the box; the left fixing device includes a left clamping unit one and a left clamping unit two with adjustable left and right spacing mounted on the adjustable mounting frame; the right fixing device includes a right clamping unit one and a right clamping unit two with adjustable left and right spacing mounted on the adjustable mounting frame.

[0006] The advantages and positive effects of this utility model are as follows: This utility model provides a board fixing platform for wooden box processing. Through the setting of a left and right workstation, and the left and right fixing devices installed at the two workstations, dual-station clamping and fixing of the boards to be processed can be achieved, thereby improving processing efficiency. Since both the left and right fixing devices consist of two clamping units with adjustable spacing, it is convenient to clamp and fix boards of different sizes, thus improving the applicability of the fixing device. The setting of a support and positioning device can support and position the packaging box, and in conjunction with the left fixing device, it can stably clamp and position the box, further improving the applicability of the board fixing platform. The setting of an angle adjustment device allows the angle of the board to be adjusted according to processing needs during operation, thus facilitating various processing operations for the workers.

[0007] Preferably, the angle adjustment device includes two sets of adjustment supports fixedly mounted on the mounting base, each adjustment support being rotatably connected to a horizontally arranged mounting shaft, the two mounting shafts being coaxially arranged, and each mounting shaft having an inner end connected to a mounting plate fixedly connected to the mounting platform; it also includes a rotating motor mounted on each adjustment support, with a gear pair provided between the output shaft of each rotating motor and the corresponding mounting shaft; it also includes a positioning sleeve mounted on the mounting shaft, the positioning sleeve having a plurality of positioning pin holes distributed circumferentially, and a positioning pin inserted into the adjustment support, the positioning pin engaging with the positioning pin holes on the positioning sleeve.

[0008] Preferably, the left clamping unit includes a left beam plate that is adjustable in position and mounted on an adjustable mounting frame; a plurality of left drive mounting plates located on the left side of the left beam plate are fixedly connected to the left beam plate; a left drive assembly that is adjustable in position is mounted on the left beam plate and each left drive mounting plate; and a left movable positioning assembly is mounted on the protruding end of each left drive assembly; it also includes a left positioning assembly fixedly connected to the end of the left beam plate.

[0009] Preferably, the left clamping unit 2 includes a left beam plate 2 with adjustable position mounted on the adjusting mounting frame, a left adjustment hole plate located on the right side of the left beam plate 2 is fixedly connected to the left beam plate 2, a plurality of left positioning components 2 with adjustable position are mounted on the left adjustment hole plate, a left positioning component 1 is fixedly connected to one end of the left beam plate 2 and a left drive component is mounted at the other end, the distance between the left drive component and the left positioning component 1 is adjustable, and also includes a left movable positioning component mounted on the extended end of the left drive component.

[0010] Preferably: the left drive assembly includes a guide mounting seat, on which a linear drive member is mounted, the extended end of which is connected to the left movable positioning assembly, and also includes two guide rods mounted on the left movable positioning assembly, the two guide rods being slidably connected to the guide mounting seat via linear bearings; the left movable positioning assembly includes a clamping seat plate, on which a plurality of rolling rollers are rotatably connected via shafts; the first left positioning assembly includes a clamping mounting seat, on which a clamping mechanism is fixedly connected; the second left positioning assembly includes two connecting support rods arranged side by side and detachably connected to the left adjusting hole plate, and also includes a clamping mechanism two installed between the two connecting support rods, the structures of the first clamping mechanism and the second clamping mechanism being consistent with the structure of the left movable positioning assembly.

[0011] Preferably: the right clamping unit one includes a position-adjustable right beam plate one mounted on the adjusting mounting frame, a plurality of right drive mounting plates fixedly connected to the right beam plate one on its right side, a position-adjustable right drive assembly mounted on the right beam plate one and each right drive mounting plate, and a right movable positioning assembly mounted on the protruding end of each right drive assembly; it also includes a right positioning assembly one fixedly connected to the end of the right beam plate one; the right clamping unit two includes a position-adjustable right beam plate two mounted on the adjusting mounting frame, a right adjusting hole plate fixedly connected to the right beam plate two on its left side, and a right positioning hole plate fixedly connected to the right beam plate two on its right side. The adjustment plate is equipped with several right positioning components II with adjustable positions. A right positioning component I is fixed to one end of the right beam plate II, and a right drive component is installed at the other end. The distance between the right drive component and the right positioning component I is adjustable. It also includes a right movable positioning component installed at the extended end of the right drive component. The structure of the right drive component is the same as that of the left drive component, the structure of the right movable positioning component is the same as that of the left movable positioning component, the structure of the right positioning component I is the same as that of the left positioning component I, and the structure of the right positioning component II is the same as that of the left positioning component II.

[0012] Preferably, the support positioning device includes a support base plate fixed on the mounting frame, a T-shaped support II fixed in the middle of the support base plate, and T-shaped supports I on both sides of the T-shaped support II. Support positioning pins are inserted into both T-shaped supports I and T-shaped supports II. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram of the angle adjustment device in this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the left fixing device and the right fixing device in this utility model;

[0016] Figure 4This is a three-dimensional structural diagram of the left clamping unit one and the left clamping unit two in this utility model;

[0017] Figure 5 This is a three-dimensional structural diagram of the support and positioning device in this utility model.

[0018] In the diagram: 1. Mounting base; 2. Angle adjustment device; 2-1. Mounting shaft; 2-2. Mounting plate; 2-3. Drive gear; 2-4. Adjusting support; 2-5. Positioning sleeve; 2-6. Positioning pin; 2-7. Driven gear; 2-8. Rotating motor; 3. Mounting platform; 4. Adjusting mounting frame; 5. Left fixing device; 5-1. Left drive assembly; 5-1-1. Linear drive component; 5-1-2. Guide mounting seat; 5-2. Left movable positioning assembly; 5-2-1. Clamping seat plate; 5-2-2. Rolling roller; 5-3. Left positioning assembly one; 5-3-1. Clamping mechanism one; 5-3-2. Clamping mounting seat; 5-4. 5-5. Left drive mounting plate; 5-6. Left beam plate one; 5-6. Left positioning component two; 5-6-1. Clamping mechanism two; 5-6-2. Connecting support rod; 5-7. Left beam plate two; 5-8. Left adjustment hole plate; 6. Support positioning device; 6-1. T-shaped support one; 6-2. Support positioning pin; 6-3. T-shaped support two; 6-4. Support base plate; 7. Left workstation; 8. Right workstation; 9. Right fixing device; 9-1. Right drive assembly; 9-2. Right movable positioning assembly; 9-3. Right positioning component one; 9-4. Right drive mounting plate; 9-5. Right beam plate one; 9-6. Right positioning component two; 9-7. Right beam plate two; 9-8. Right adjustment hole plate. Detailed Implementation

[0019] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0020] Please see Figure 1 The board fixing platform for wooden box processing of this utility model includes a mounting base 1, a mounting frame 3 movably mounted on the mounting base 1, and an angle adjustment device 2 installed between the mounting base 1 and the mounting frame 3 for adjusting the flip angle of the mounting frame 3.

[0021] See further Figure 2The aforementioned angle adjustment device 2 includes two sets of adjustment supports 2-4 fixedly connected to the mounting base 1. Each adjustment support 2-4 is rotatably connected to a horizontally arranged mounting shaft 2-1. The two mounting shafts 2-1 are coaxially arranged. At the inner end of each mounting shaft 2-1, a mounting plate 2-2 fixedly connected to the mounting platform 3 is connected. It also includes a rotating motor 2-8 mounted on each adjustment support 2-4. A gear pair is provided between the output shaft of each rotating motor 2-8 and the corresponding mounting shaft 2-1. The gear pair includes a driving gear 2-3 keyed to the output shaft of the rotating motor 2-8 and a driven gear 2-7 keyed to the mounting shaft 2-1. The driving gear 2-3 and the driven gear 2-7 mesh with each other.

[0022] The angle adjustment device 2 also includes a positioning sleeve 2-5 mounted on the mounting shaft 2-1. The positioning sleeve 2-5 has several circumferentially distributed positioning pin holes. It also includes a positioning pin 2-6 inserted into the adjustment support 2-4, which engages with the positioning pin holes on the positioning sleeve 2-5. When the angle adjustment is required, the rotating motor 2-8 in the angle adjustment device 2 starts, driving the drive gear 2-3 to rotate, which in turn drives the driven gear 2-7 meshing with it to rotate, thereby rotating the mounting shaft 2-1. The rotating mounting shaft 2-1 can rotate the mounting platform 3, which in turn causes the left fixing device 5 and right fixing device 9 to rotate the clamped plate by a preset angle. Then, the positioning pin 2-6 and positioning sleeve 2-5 are used to lock the position of the rotated mounting platform 3.

[0023] like Figure 1 As shown, an adjustable mounting frame 4 is fixed to the top of the mounting platform 3. A left station 7 and a right station 8 are arranged on the adjustable mounting frame 4. A left fixing device 5 is provided at the left station 7 for clamping and fixing the plate. A right fixing device 9 is provided at the right station 8 for clamping and fixing the plate. A support positioning device 6 is provided below the left fixing device 5 and installed on the mounting platform 3 for supporting and positioning the box.

[0024] See further Figure 3 The aforementioned left fixing device 5 includes a left clamping unit 1 and a left clamping unit 2 with adjustable left and right spacing, which are installed on the adjusting mounting frame 4; the right fixing device 9 includes a right clamping unit 1 and a right clamping unit 2 with adjustable left and right spacing, which are installed on the adjusting mounting frame 4.

[0025] The left clamping unit includes an adjustable left beam plate 5-5 mounted on the adjustable mounting frame 4. Several left drive mounting plates 5-4 are fixed to the left side of the left beam plate 5-5. Adjustable left drive components 5-1 are mounted on both the left beam plate 5-5 and each left drive mounting plate 5-4. A left movable positioning component 5-2 is mounted on the protruding end of each left drive component 5-1. The unit also includes a left positioning component 5-3 fixed to the end of the left beam plate 5-5. Furthermore, several mounting through holes are provided on the left beam plate 5-5 along its length. The aforementioned left drive components 5-1 are detachably connected to the left beam plate 5-5 via bolts and lock nuts passing through the mounting through holes.

[0026] like Figure 3 As shown, the aforementioned left clamping unit 2 includes a left beam plate 2 5-7 with adjustable position mounted on the adjusting mounting frame 4. A left adjusting hole plate 5-8 located on the right side of the left beam plate 2 5-7 is fixedly connected to the left beam plate 2 5-7. Several left positioning components 2 5-6 with adjustable position are mounted on the left adjusting hole plate 5-8. A left positioning component 1 5-3 is fixedly connected to one end of the left beam plate 2 5-7, and a left drive component 5-1 is mounted at the other end. The distance between the left drive component 5-1 and the left positioning component 1 5-3 is adjustable. It also includes a left movable positioning component 5-2 mounted on the extended end of the left drive component 5-1. In addition, several mounting through holes are opened on the left beam plate 2 5-7 along its length direction. The aforementioned left drive component 5-1 is detachably connected to the left beam plate 2 5-7 by bolts and lock nuts passing through the mounting through holes.

[0027] Furthermore, several mounting through holes are provided on the adjustment mounting frame 4, and the left beam plate 1 5-5 and the left beam plate 2 5-7 are detachably connected to the adjustment mounting frame 4 by bolts and lock nuts passing through the mounting through holes.

[0028] See further Figure 4 The aforementioned left drive assembly 5-1 includes a guide mounting base 5-1-2, on which a linear drive component 5-1-1 is mounted. In this embodiment, the linear drive component 5-1-1 is a cylinder. The extended end of the linear drive component 5-1-1 is connected to the left movable positioning assembly 5-2. It also includes two guide rods mounted on the left movable positioning assembly 5-2, which are slidably connected to the guide mounting base 5-1-2 via linear bearings.

[0029] The left movable positioning assembly 5-2 includes a clamping base plate 5-2-1, on which a plurality of rolling rollers 5-2-2 are rotatably connected via shafts. In this embodiment, the plurality of rolling rollers 5-2-2 may be ball bearings, and the plurality of rolling rollers 5-2-2 are arranged in three rows.

[0030] The left positioning component 5-3 includes a clamping mounting base 5-3-2, on which a clamping mechanism 5-3-1 is fixedly connected.

[0031] The second left positioning component 5-6 includes two connecting rods 5-6-2 arranged side by side and detachably connected to the left adjusting hole plate 5-8. To facilitate detachable connection, several through holes are provided on the left adjusting hole plate 5-8 along its length. The connecting rods 5-6-2 are detachably connected to the left adjusting hole plate 5-8 by bolts passing through the through holes. The second left positioning component 5-6 also includes a clamping mechanism 5-6-1 installed between the two connecting rods 5-6-2. The structures of the first clamping mechanism 5-3-1 and the second clamping mechanism 5-6-1 are consistent with the structure of the left movable positioning component 5-2.

[0032] like Figure 3 As shown, the aforementioned right clamping unit includes a right beam plate 9-5 with adjustable position mounted on the adjusting mounting frame 4, several right drive mounting plates 9-4 fixedly connected to the right beam plate 9-5 on its right side, right drive components 9-1 with adjustable position mounted on the right beam plate 9-5 and each right drive mounting plate 9-4, right movable positioning components 9-2 mounted on the extended end of each right drive component 9-1, and a right positioning component 9-3 fixedly connected to the end of the right beam plate 9-5.

[0033] The second right clamping unit includes a second right beam plate 9-7 with adjustable position mounted on the adjusting mounting frame 4, a right adjusting hole plate 9-8 fixed to the left side of the second right beam plate 9-7, several right positioning components 9-6 with adjustable position mounted on the right adjusting hole plate 9-8, a right positioning component 9-3 fixed to one end of the second right beam plate 9-7 and a right driving component 9-1 mounted at the other end, the distance between the right driving component 9-1 and the right positioning component 9-3 is adjustable, and also includes a right movable positioning component 9-2 mounted at the extended end of the right driving component 9-1.

[0034] In this embodiment, the structure of the right drive component 9-1 is the same as that of the left drive component 5-1, the structure of the right movable positioning component 9-2 is the same as that of the left movable positioning component 5-2, the structure of the right positioning component 9-3 is the same as that of the left positioning component 5-3, and the structure of the right positioning component 9-6 is the same as that of the left positioning component 5-6.

[0035] See further Figure 5The aforementioned support and positioning device 6 includes a support base plate 6-4 fixedly connected to the mounting frame 3, a T-shaped support 6-3 fixedly connected to the middle of the support base plate 6-4, a T-shaped support 6-1 on both sides of the T-shaped support 6-3, and a support positioning pin 6-2 inserted into both T-shaped supports 6-1 and T-shaped support 6-3.

[0036] Working principle:

[0037] In actual operation, the distance between left clamping unit 1 and left clamping unit 2 in the left-right direction, as well as the distance between right clamping unit 1 and right clamping unit 2 in the left-right direction, can be adjusted according to the size of the workpiece to be processed. The distance between the corresponding left positioning component 1 5-3 and left movable positioning component 5-2, and right positioning component 1 9-3 and right movable positioning component 9-2 in the front-back direction can also be adjusted to ensure that the left fixing device 5 and right fixing device 9 can clamp and fix the workpiece to be processed. After completing the above adjustments, the workpiece to be processed is placed on the left station 7 and right station 8 respectively, and the corresponding linear drive is activated, causing each positioning component to clamp and fix the workpiece. This facilitates the processing of the panels by the staff. When processing of the box is required, the positions of the left clamping unit 1 and the left clamping unit 2 in the left fixing device 5 are adjusted according to the size of the box. Then, the box is placed on the support positioning device 6 and the support positioning device 6 is used to support and position the box. Then, the left fixing device 5 is used to clamp the side wall of the box, thereby completing the clamping and positioning of the box, which facilitates the processing of the box. During the processing, the angle adjustment device 2 can be used to drive the mounting frame 3 to rotate at a certain angle, thereby causing the panel or box to be processed to rotate at a preset angle, so as to facilitate the operation of the staff.

Claims

1. A board fixing platform for wooden box processing, characterized in that: The system includes a mounting base (1), on which a mounting platform (3) is movably mounted. An angle adjustment device (2) is installed between the mounting base (1) and the mounting platform (3) to adjust the rotation angle of the mounting platform (3). An adjustable mounting frame (4) is fixed to the top of the mounting platform (3). A left workstation (7) and a right workstation (8) are provided on the adjustable mounting frame (4) according to their left and right orientations. A left fixing device (5) is provided at the left workstation (7) to clamp and fix the plate. A right fixing device (9) is provided at the right workstation (8) for clamping and fixing the plate; a support positioning device (6) is provided below the left fixing device (5) and installed on the mounting frame (3) for supporting the positioning box; the left fixing device (5) includes a left clamping unit one and a left clamping unit two with adjustable left and right spacing installed on the adjusting mounting frame (4); the right fixing device (9) includes a right clamping unit one and a right clamping unit two with adjustable left and right spacing installed on the adjusting mounting frame (4).

2. The board fixing platform for wooden box processing as described in claim 1, characterized in that: The angle adjustment device (2) includes two sets of adjustment supports (2-4) fixedly connected to the mounting base (1). Each adjustment support (2-4) is rotatably connected to a horizontally arranged mounting shaft (2-1). The two mounting shafts (2-1) are coaxially arranged. Each mounting shaft (2-1) has a mounting plate (2-2) fixedly connected to the mounting platform (3) at its inner end. The device also includes a rotating motor (2-8) mounted on each adjustment support (2-4). A gear pair is provided between the output shaft of each rotating motor (2-8) and the corresponding mounting shaft (2-1). The device also includes a positioning sleeve (2-5) mounted on the mounting shaft (2-1). The positioning sleeve (2-5) has several positioning pin holes distributed circumferentially. The device also includes a positioning pin (2-6) inserted into the adjustment support (2-4). The positioning pin (2-6) is engaged with the positioning pin hole on the positioning sleeve (2-5).

3. The board fixing platform for wooden box processing as described in claim 1, characterized in that: The left clamping unit includes a left beam plate (5-5) with adjustable position mounted on the adjusting mounting frame (4), a plurality of left drive mounting plates (5-4) fixed on the left beam plate (5-5) located on its left side, a left drive assembly (5-1) with adjustable position mounted on the left beam plate (5-5) and each left drive mounting plate (5-4), and a left movable positioning assembly (5-2) mounted on the protruding end of each left drive assembly (5-1); it also includes a left positioning assembly (5-3) fixed to the end of the left beam plate (5-5).

4. The board fixing platform for wooden box processing as described in claim 3, characterized in that: The second left clamping unit includes a second left beam plate (5-7) with adjustable position mounted on the adjusting mounting frame (4), a left adjusting hole plate (5-8) located on the right side of the second left beam plate (5-7) is fixedly connected to the second left beam plate (5-7), a plurality of second left positioning components (5-6) with adjustable position are mounted on the left adjusting hole plate (5-8), a first left positioning component (5-3) is fixedly connected to one end of the second left beam plate (5-7), and a left drive component (5-1) is mounted at the other end. The distance between the left drive component (5-1) and the first left positioning component (5-3) is adjustable. It also includes a left movable positioning component (5-2) mounted on the extended end of the left drive component (5-1).

5. The board fixing platform for wooden box processing as described in claim 4, characterized in that: The left drive assembly (5-1) includes a guide mounting base (5-1-2), on which a linear drive element (5-1-1) is mounted. The extended end of the linear drive element (5-1-1) is connected to the left movable positioning assembly (5-2). It also includes two guide rods mounted on the left movable positioning assembly (5-2), which are slidably connected to the guide mounting base (5-1-2) via linear bearings. The left movable positioning assembly (5-2) includes a clamping plate (5-2-1), on which several rolling rollers are rotatably connected via shafts. 5-2-2); Left positioning component one (5-3) includes a clamping mounting base (5-3-2), on which clamping mechanism one (5-3-1) is fixedly connected; Left positioning component two (5-6) includes two connecting rods (5-6-2) arranged side by side and detachably connected to the left adjusting hole plate (5-8), and also includes clamping mechanism two (5-6-1) installed between the two connecting rods (5-6-2). The structure of clamping mechanism one (5-3-1) and the structure of clamping mechanism two (5-6-1) are consistent with the structure of left movable positioning component (5-2).

6. The board fixing platform for wooden box processing as described in claim 4, characterized in that: The first right clamping unit includes a position-adjustable right beam plate (9-5) mounted on the adjusting mounting frame (4), a plurality of right drive mounting plates (9-4) fixed to the right beam plate (9-5) on its right side, and position-adjustable right drive components (9-1) mounted on the right beam plate (9-5) and each right drive mounting plate (9-4), with right movable positioning components (9-2) mounted on the protruding ends of each right drive component (9-1); it also includes a right positioning component (9-3) fixed to the end of the right beam plate (9-5); the second right clamping unit includes a position-adjustable right beam plate (9-7) mounted on the adjusting mounting frame (4), and a right adjusting hole plate (9-8) fixed to the right beam plate (9-7) on its left side, with right adjusting hole plate (9-8) on the right adjusting hole plate (9-8) The upper part is equipped with several right positioning components 2 (9-6) with adjustable positions. Right positioning component 1 (9-3) is fixed to one end of the right beam plate 2 (9-7), and right drive component (9-1) is installed at the other end. The distance between right drive component (9-1) and right positioning component 1 (9-3) is adjustable. It also includes a right movable positioning component (9-2) installed at the protruding end of right drive component (9-1). The structure of right drive component (9-1) is the same as that of left drive component (5-1), the structure of right movable positioning component (9-2) is the same as that of left movable positioning component (5-2), the structure of right positioning component 1 (9-3) is the same as that of left positioning component 1 (5-3), and the structure of right positioning component 2 (9-6) is the same as that of left positioning component 2 (5-6).

7. The board fixing platform for wooden box processing as described in claim 1, characterized in that: The support positioning device (6) includes a support base plate (6-4) fixed on the mounting frame (3), a T-shaped support second (6-3) fixed in the middle of the support base plate (6-4), a T-shaped support first (6-1) on both sides of the T-shaped support second (6-3), and a support positioning pin (6-2) inserted on both T-shaped supports first (6-1) and T-shaped support second (6-3).

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