Numerical control building metal profile processing machine tool

Abstract

The invention provides a numerical control building metal profile processing machine tool, and relates to the technical field of processing machine tools. The numerical control building metal profile machining tool comprises a supporting table, a cutting device, a three-coordinate driving module and supporting seats, an opening groove is formed in the upper surface of the supporting table, the multiple supporting seats are slidably arranged in the opening groove side by side, a containing groove is formed between every two supporting seats, and the other supporting seats abut against one another; the three-coordinate driving module is arranged on the supporting table, the cutting device comprises a rotatable saw blade, the three-coordinate driving module is in driving connection with the cutting device, and when the cutting device moves in the X-axis direction, the corresponding supporting bases move synchronously so that the containing grooves can be located under the cutting device. The position of the containing groove can be flexibly changed, and the width of the containing groove is larger than the thickness of the saw blade, so that when the saw blade cuts at the corresponding position, at least part of the saw blade can stretch into the containing groove, and the applicability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of processing machine tools, and in particular to a numerically controlled architectural metal profile processing machine tool. Background Art

[0002] Architectural metal profiles include many types, such as plates, steel bars, steel pipes, etc. These profiles are widely used in the construction industry, providing a strong guarantee for the stability, safety and aesthetics of building structures. In the processing of architectural metal profiles, the cutting link plays a pivotal role. In the construction industry, strip plates can be used to make steel structure frames, roof panels, wall decorations, etc.

[0003] At the construction site, sometimes a whole rectangular metal sheet needs to be cut into multiple strips of equal size as needed. Most traditional cutting equipment, such as Figure 6 As shown, by opening a plurality of equidistant slots on the processing table, the saw blade gradually enters the slots when cutting downwards, which can not only achieve the cutting of the plate but also prevent the saw blade from hitting the upper surface of the processing table. However, since the slots are fixed, the applicability of the cutting equipment is general, and it is often necessary to measure and mark for hand-held cutting, which affects the cutting efficiency. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a numerically controlled building metal profile processing machine tool.

[0005] The present invention provides a CNC architectural metal profile processing machine tool, comprising a support table, a cutting device, a three-coordinate drive module and a support seat, wherein the upper surface of the support table is provided with an open groove, and a plurality of the support seats are slidably arranged side by side in the open groove, wherein a receiving groove is formed between two of the support seats, and the remaining support seats are abutted against each other, the three-coordinate drive module is arranged on the support table, the cutting device comprises a rotatable saw blade, and the three-coordinate drive module is drivingly connected to the cutting device to drive the cutting device to move along the X-axis, Y-axis and Z-axis directions, and when the cutting device moves along the X-axis direction, the corresponding support seat moves synchronously so that the receiving groove is located directly below the cutting device.

[0006] Optionally, the cutting device further comprises a motor, which is drivingly connected to the saw blade to drive the saw blade to rotate.

[0007] Optionally, the CNC architectural metal profile processing machine tool also includes a follower mechanism and a driving mechanism, and the driving mechanism is connected to the three-coordinate driving module through the follower mechanism. When the three-coordinate driving module drives the cutting device to move along the positive direction of the X-axis, the driving mechanism pushes the corresponding support seat to move along the negative direction of the X-axis. When the three-coordinate driving module drives the cutting device to move along the negative direction of the X-axis, the driving mechanism pushes the corresponding support seat to move along the positive direction of the X-axis, so that the accommodating groove is always formed directly below the cutting device.

[0008] Optionally, the three-coordinate drive module includes an X-axis drive component, a Y-axis drive component, and a Z-axis drive component. The Y-axis drive component is connected to the support table, the Y-axis drive component is drivingly connected to the X-axis drive component to drive the X-axis drive component to move along the Y-axis direction, the X-axis drive component is drivingly connected to the Z-axis drive component to drive the Z-axis drive component to move along the X-axis direction, and the Z-axis drive component is drivingly connected to the cutting device to drive the cutting device to move along the Z-axis direction.

[0009] Optionally, the follower mechanism includes a first telescopic rod, a connecting rod and a second telescopic rod, one end of the first telescopic rod is connected to the Z-axis drive assembly, the other end of the first telescopic rod is connected to one end of the connecting rod, the other end of the connecting rod is connected to one end of the second telescopic rod, and the other end of the second telescopic rod is connected to the driving mechanism.

[0010] Optionally, the driving mechanism includes a moving rod, a first tooth, a gear and a second tooth, the first tooth is arranged on the upper surface of the moving rod, a gear is arranged under each of the support seats, the gear is rotatably connected to the support platform, the second tooth is arranged on the lower surface of each of the support seats, the upper tooth portion of the gear is meshed with the second tooth, the lower tooth portion of the gear is meshed with the first tooth, and the moving rod is connected to an end of the second telescopic rod away from the connecting rod.

[0011] Optionally, the driving mechanism further comprises a guide seat, wherein the guide seat is disposed below the support platform, and the moving rod is slidably connected to the guide seat.

[0012] Optionally, the support seat is configured as a hollow structure, and a through hole for communicating with the accommodating groove is provided on the lower edge of the support seat.

[0013] Optionally, the CNC architectural metal profile processing machine tool further includes an opening and closing mechanism and a drain pipe, wherein the drain pipe is connected to the bottom of the accommodating tank, a valve is provided on the drain pipe, and the opening and closing mechanism is used to open or close the through hole.

[0014] Optionally, the opening and closing mechanism includes a plug and a push-pull rod, one end of the push-pull rod is connected to the corresponding support seat, and the other end of the push-pull rod passes through the corresponding through hole and is connected to the plug, and the plug is used to block the through hole.

[0015] The beneficial effects of the CNC architectural metal profile processing machine tool of the present invention are: the cutting device is driven to move along the X-axis direction by the three-coordinate drive module to adjust the cutting width, and the cutting device is driven to move along the Y-axis and Z-axis directions by the three-coordinate drive module, so that a piece of architectural metal sheet can be cut into multiple strip sheets of required width. According to the required cutting width, a plurality of identical support seats are placed in the open groove of the support table, so that the position of the accommodating groove can be flexibly changed, and the width of the accommodating groove itself is greater than the thickness of the saw blade, so that the saw blade can at least partially extend into the accommodating groove when cutting at the corresponding position, thereby improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a saw blade in a first receiving groove according to an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of the structure at center; Figure 4 is a schematic diagram of the structure of the saw blade in the second receiving groove according to an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of the structure at B in FIG. Figure 6 It is a structural schematic diagram of an existing processing table.

[0017] Description of reference numerals: Support table; 11. Receiving groove; 2. Cutting device; 21. Saw blade; 22. Motor; 3. Three-coordinate drive module; 31. X-axis drive assembly; 32. Y-axis drive assembly; 33. Z-axis drive assembly; 4. Support seat; 41. Through hole; 5. Follow-up mechanism; 51. First telescopic rod; 52. Connecting rod; 53. Second telescopic rod; 6. Driving mechanism; 61. Moving rod; 62. First tooth; 63. Gear; 64. Second tooth; 65. Guide seat; 7. Opening and closing mechanism; 71. Plug; 72. Push-pull rod; 8. Drain pipe; 100. Building metal sheet. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner.

[0021] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0022] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the up, and the negative direction of the Z axis represents the down; the X axis in the accompanying drawings represents the horizontal direction, and is designated as the left and right positions, and the positive direction of the X axis represents the left side, and the negative direction of the X axis represents the right side; the Y axis in the accompanying drawings represents the front and back positions, and the positive direction of the Y axis represents the front side, and the negative direction of the Y axis represents the back side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] An embodiment of the present invention provides a CNC architectural metal profile processing machine tool, including a support table 1, a cutting device 2, a three-coordinate drive module 3 and a support seat 4. The upper surface of the support table 1 is provided with an open groove, and a plurality of support seats 4 are slidably arranged side by side in the open groove, wherein a receiving groove 11 is formed between two support seats 4, and the remaining support seats 4 are abutted against each other. The three-coordinate drive module 3 is arranged on the support table 1, and the cutting device 2 includes a rotatable saw blade 21. The three-coordinate drive module 3 is driven and connected to the cutting device 2 to drive the cutting device 2 to move along the X-axis, Y-axis and Z-axis directions. When the cutting device 2 moves along the X-axis direction, the corresponding support seat 4 moves synchronously so that the receiving groove 11 is located directly below the cutting device 2.

[0024] In this optional embodiment, the cutting width can be adjusted by driving the cutting device 2 to move along the X-axis direction through the three-coordinate drive module 3, and the cutting device 2 can be driven to move along the Y-axis and Z-axis directions through the three-coordinate drive module 3, so that a piece of building metal sheet 100 can be cut into multiple strip sheets of required width. According to the required cutting width, by placing multiple identical support seats 4 in the open groove of the support table 1, the position of the accommodating groove 11 can be flexibly changed, and the width of the accommodating groove 11 itself is greater than the thickness of the saw blade 21, so that the saw blade 21 can at least partially extend into the accommodating groove 11 when cutting at the corresponding position, thereby improving applicability.

[0025] It should be noted that the support seats 4 can be arranged in multiple groups according to common situations. In this optional embodiment, a total of five support seats 4 form a group, so that five equal-sized strip plates can be cut. When six equal-sized strip plates need to be cut, six support seats 4 form a group. Since the total length of the open groove remains unchanged, the accommodating groove 11 formed by the six support seats 4 and the accommodating groove 11 formed by the five support seats 4 are not in the same position, thereby realizing dynamic adjustment of the accommodating groove 11.

[0026] Optionally, the cutting device 2 further includes a motor 22 , which is drivingly connected to the saw blade 21 to drive the saw blade 21 to rotate.

[0027] In this optional embodiment, combined with Figure 1 As shown, the output shaft of the motor 22 is connected to the saw blade 21 , and the rotation of the motor 22 drives the saw blade 21 to rotate, thereby achieving cutting of the building metal plate 100 .

[0028] Furthermore, the CNC architectural metal profile processing machine tool also includes a follower mechanism 5 and a driving mechanism 6. The driving mechanism 6 is connected to the three-coordinate driving module 3 through the follower mechanism 5. When the three-coordinate driving module 3 drives the cutting device 2 to move along the positive direction of the X-axis, the driving mechanism 6 pushes the corresponding support seat 4 to move along the negative direction of the X-axis. When the three-coordinate driving module 3 drives the cutting device 2 to move along the negative direction of the X-axis, the driving mechanism 6 pushes the corresponding support seat 4 to move along the positive direction of the X-axis, so that the accommodating groove 11 is always formed directly below the cutting device 2.

[0029] In this optional embodiment, by making the receiving groove 11 always located directly below the cutting device 2, when the saw blade 21 cuts downwardly on the building metal sheet 100, at least a portion of the saw blade 21 will extend into the receiving groove 11, which not only protects the saw blade 21 but also improves the cutting effect on the building metal sheet 100.

[0030] Optionally, the three-coordinate drive module 3 includes an X-axis drive component 31, a Y-axis drive component 32, and a Z-axis drive component 33. The Y-axis drive component 32 is connected to the support table 1. The Y-axis drive component 32 is driven and connected to the X-axis drive component 31 to drive the X-axis drive component 31 to move along the Y-axis direction. The X-axis drive component 31 is driven and connected to the Z-axis drive component 33 to drive the Z-axis drive component 33 to move along the X-axis direction. The Z-axis drive component 33 is driven and connected to the cutting device 2 to drive the cutting device 2 to move along the Z-axis direction.

[0031] Specifically, the X-axis drive assembly 31 can be composed of a structural part, a guide part, a transmission part, a sensor detection element and a mechanical limit component. The structural part can be made of aluminum profiles or solid materials such as square tubes and rectangular tubes, as a mounting base for guide parts, transmission parts and other components, and bear the load of the cutting device 2. The guide part can adopt linear guides or V-shaped roller guides to ensure the stability and accuracy of the X-axis movement. The transmission part can achieve precise movement of the X-axis by electric means (such as a ball screw structure, etc.). In addition, servo motors are also often used as drive sources, and rotational motion is converted into linear motion through transmission components such as synchronous belts. Sensor detection elements such as photoelectric encoders and grating rulers are used to detect the movement position and speed of the X-axis to ensure the accuracy and safety of the movement. The Y-axis drive assembly 32 works in conjunction with the X-axis drive assembly 31 to achieve comprehensive positioning and adjustment of the cutting device 2 on the horizontal plane. The Y-axis drive assembly 32 is similar to the X-axis drive assembly 31. The Y-axis drive assembly 32 also includes a structural part, a guide part, a transmission part, a sensor detection element, and a mechanical limiter. The Z-axis drive assembly 33 controls the movement of the cutting device 2 in the vertical direction (up and down) to achieve the cutting operation. The Z-axis drive assembly 33 also consists of a structural part, a guide part, a transmission part, a sensor detection element, and a mechanical limiter.

[0032] In this optional embodiment, the X-axis drive assembly 31, the Y-axis drive assembly 32 and the Z-axis drive assembly 33 work together to achieve precise movement of the cutting device 2 in three-dimensional space, thereby cutting a piece of building metal sheet 100 into multiple strips of required width.

[0033] Furthermore, the follower mechanism 5 includes a first telescopic rod 51, a connecting rod 52 and a second telescopic rod 53, one end of the first telescopic rod 51 is connected to the Z-axis driving assembly 33, the other end of the first telescopic rod 51 is connected to one end of the connecting rod 52, the other end of the connecting rod 52 is connected to one end of the second telescopic rod 53, and the other end of the second telescopic rod 53 is connected to the driving mechanism 6.

[0034] Optionally, the driving mechanism 6 includes a moving rod 61, a first tooth 62, a gear 63 and a second tooth 64. The first tooth 62 is arranged on the upper surface of the moving rod 61. A gear 63 is arranged under each support seat 4. The gear 63 is rotatably connected to the support platform 1. The second tooth 64 is arranged on the lower surface of each support seat 4. The upper tooth portion of the gear 63 is meshed with the second tooth 64, and the lower tooth portion of the gear 63 is meshed with the first tooth 62. The moving rod 61 is connected to the end of the second telescopic rod 53 away from the connecting rod 52.

[0035] In this optional embodiment, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, from right to left, they are the first support seat 4, the second support seat 4, the third support seat 4, the fourth support seat 4 and the fifth support seat 4. When the Z-axis drive assembly 33 moves to the right as a whole, the first telescopic rod 51, the connecting rod 52 and the second telescopic rod 53 drive the moving rod 61 to move to the right, thereby driving the gear 63 to rotate clockwise through the first tooth 62, and then driving the second support seat 4 to move to the left through the second tooth 64. At this time, the first accommodating groove 11 formed between the first support seat 4 and the second support seat 4 disappears, and a new second accommodating groove 11 is formed between the second support seat 4 and the third support seat 4. The second accommodating groove 11 is just below the saw blade 21.

[0036] It should be noted that when the Z-axis driving assembly 33 moves along the Y-axis, the first telescopic rod 51 and the second telescopic rod 53 can be contracted or extended instead of being rigid, thereby increasing the service life of the follower mechanism 5 .

[0037] Furthermore, the driving mechanism 6 further includes a guide seat 65 , which is disposed below the support platform 1 , and the moving rod 61 is slidably connected to the guide seat 65 .

[0038] In this optional embodiment, a slide groove may be provided on the guide seat 65 , and a sliding portion may be provided on the moving rod 61 , and the sliding portion is slidably connected in the slide groove, thereby achieving position limiting guidance for the moving rod 61 .

[0039] Optionally, the support seat 4 is configured as a hollow structure, and a through hole 41 for communicating with the accommodating groove 11 is provided at a lower edge of the support seat 4 .

[0040] In this optional embodiment, combined with Figure 3 and Figure 5As shown, by injecting a certain height of water into the interior of the support seat 4 and the interior of the receiving groove 11, thanks to the existence of the through hole 41, the liquid level in the support seat 4 can be flush with the liquid level in the receiving groove 11, so that the saw blade 21 can be cooled by the water in the receiving groove 11, and the rotating saw blade 21 can also carry away the debris accumulated between the teeth of the saw blade 21 through the disturbed water flow. The disturbed water flow can continuously exchange the water in the receiving groove 11 with the water in the support seat 4, so that the water in the receiving groove 11 maintains a lower temperature for a certain period of time, thereby improving the cooling effect on the saw blade 21.

[0041] Furthermore, the CNC architectural metal profile processing machine tool also includes an opening and closing mechanism 7 and a drain pipe 8. The drain pipe 8 is connected to the bottom of the accommodating groove 11. A valve is provided on the drain pipe 8. The opening and closing mechanism 7 is used to open or close the through hole 41. The opening and closing mechanism 7 includes a plug 71 and a push-pull rod 72. One end of the push-pull rod 72 is connected to the corresponding support seat 4, and the other end of the push-pull rod 72 passes through the corresponding through hole 41 and is connected to the plug 71. The plug 71 is used to block the through hole 41.

[0042] In this optional embodiment, combined with Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, Figure 2 The push-pull rod 72 and the plug 71 in the second support seat 4 (counted from right to left) extend into the interior of the second support seat 4. When the second support seat 4 (counted from right to left) moves to the right, that is, the second support seat 4 moves from Figure 2 Move to the middle position Figure 4 During the process of moving to the middle position, a second receiving groove 11 (counting from right to left) is gradually formed between the second support seat 4 and the third support seat 4 (counting from right to left). During this process, the water in the second support seat 4 gradually flows into the second receiving groove 11 until the plug 71 blocks the through hole 41 on the second support seat 4. At this time, the second receiving groove 11 is not connected to the second support seat 4, thereby preventing debris from entering the second support seat 4 and polluting the water inside the second support seat 4. When the saw blade 21 is cooled down, the valve on the drain pipe 8 below the second receiving groove 11 is opened to discharge the sewage in the second receiving groove 11. In the subsequent processing process, the water in the second support seat 4 can be automatically replenished to the second receiving groove 11, which not only facilitates the actual operation but also saves water resources.

[0043] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A CNC architectural metal profile processing machine tool, characterized in that: The invention comprises a support platform (1), a cutting device (2), a three-coordinate driving module (3) and a support seat (4); the upper surface of the support platform (1) is provided with an open groove; a plurality of the support seats (4) are slidably arranged side by side in the open groove; a receiving groove (11) is formed between two of the support seats (4); and the remaining support seats (4) are mutually abutted; the three-coordinate driving module (3) is arranged on the support platform (1); the cutting device (2) comprises a rotatable saw blade (21); the three-coordinate driving module (3) is drivingly connected to the cutting device (2) to drive the cutting device (2) to move along the X-axis, Y-axis and Z-axis directions; when the cutting device (2) moves along the X-axis direction, the corresponding support seat (4) moves synchronously so that the receiving groove (11) is located directly below the cutting device (2).

2. The CNC architectural metal profile processing machine tool according to claim 1, characterized in that: The cutting device (2) further comprises a motor (22), wherein the motor (22) is drivingly connected to the saw blade (21) to drive the saw blade (21) to rotate.

3. The CNC architectural metal profile processing machine tool according to claim 1, characterized in that: The invention also comprises a follower mechanism (5) and a driving mechanism (6), wherein the driving mechanism (6) is connected to the three-coordinate driving module (3) via the follower mechanism (5); when the three-coordinate driving module (3) drives the cutting device (2) to move along the positive direction of the X-axis, the driving mechanism (6) pushes the corresponding supporting seat (4) to move along the negative direction of the X-axis; when the three-coordinate driving module (3) drives the cutting device (2) to move along the negative direction of the X-axis, the driving mechanism (6) pushes the corresponding supporting seat (4) to move along the positive direction of the X-axis, so that the accommodating groove (11) is always formed directly below the cutting device (2).

4. The CNC architectural metal profile processing machine tool according to claim 3, characterized in that: The three-coordinate drive module (3) comprises an X-axis drive component (31), a Y-axis drive component (32), and a Z-axis drive component (33); the Y-axis drive component (32) is connected to the support platform (1); the Y-axis drive component (32) is drivably connected to the X-axis drive component (31) to drive the X-axis drive component (31) to move along the Y-axis direction; the X-axis drive component (31) is drivably connected to the Z-axis drive component (33) to drive the Z-axis drive component (33) to move along the X-axis direction; and the Z-axis drive component (33) is drivably connected to the cutting device (2) to drive the cutting device (2) to move along the Z-axis direction.

5. The CNC architectural metal profile processing machine tool according to claim 4, characterized in that: The follower mechanism (5) comprises a first telescopic rod (51), a connecting rod (52) and a second telescopic rod (53); one end of the first telescopic rod (51) is connected to the Z-axis driving assembly (33); the other end of the first telescopic rod (51) is connected to one end of the connecting rod (52); the other end of the connecting rod (52) is connected to one end of the second telescopic rod (53); and the other end of the second telescopic rod (53) is connected to the driving mechanism (6).

6. The CNC architectural metal profile processing machine tool according to claim 5, characterized in that: The driving mechanism (6) comprises a moving rod (61), a first tooth (62), a gear (63) and a second tooth (64); the first tooth (62) is arranged on the upper surface of the moving rod (61); a gear (63) is arranged below each of the support seats (4); the gear (63) is rotatably connected to the support platform (1); the second tooth (64) is arranged on the lower surface of each of the support seats (4); the upper tooth portion of the gear (63) is meshedly connected to the second tooth (64); the lower tooth portion of the gear (63) is meshedly connected to the first tooth (62); and the moving rod (61) is connected to an end of the second telescopic rod (53) away from the connecting rod (52).

7. The CNC architectural metal profile processing machine tool according to claim 6, characterized in that: The driving mechanism (6) further comprises a guide seat (65), wherein the guide seat (65) is arranged below the support platform (1), and the moving rod (61) is slidably connected to the guide seat (65).

8. The CNC architectural metal profile processing machine tool according to claim 1, characterized in that: The support seat (4) is configured as a hollow structure, and a through hole (41) for communicating with the accommodating groove (11) is provided on the lower edge of the support seat (4).

9. The CNC architectural metal profile processing machine tool according to claim 8, characterized in that: It also comprises an opening and closing mechanism (7) and a drainage pipe (8), wherein the drainage pipe (8) is in communication with the bottom of the containing groove (11), a valve is provided on the drainage pipe (8), and the opening and closing mechanism (7) is used to open or close the through hole (41).

10. The CNC architectural metal profile processing machine tool according to claim 9, characterized in that: The opening and closing mechanism (7) comprises a plug (71) and a push-pull rod (72), one end of the push-pull rod (72) is connected to the corresponding support seat (4), the other end of the push-pull rod (72) passes through the corresponding through hole (41) and is connected to the plug (71), and the plug (71) is used to block the through hole (41).

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