Universal fixing clamp for welding

Abstract

The utility model discloses a universal fixing clamp for welding. The universal fixing clamp comprises a base, the two transverse guide rails are arranged on the base in parallel; the two ends of the longitudinal guide rail are arranged on the transverse guide rails respectively; two fixing devices are arranged on each longitudinal guide rail, each fixing device comprises a limiting plate and a limiting column, the limiting plates are located on the inner sides of the limiting columns, the top ends of the limiting columns are higher than the top ends of the limiting plates, and the limiting plates and the limiting columns are vertically arranged; and the pressing device is arranged on one of the transverse guide rails. Through cooperation of all structures and reasonable distribution of positions, the whole clamp is simple in structure, and a workpiece can be conveniently and rapidly placed and pressed on the corresponding structure; through the structures, two workpieces can be fixed, and operation is convenient. And meanwhile, through adjustability of corresponding structures, the welding fixture can be suitable for fixing workpieces of different sizes and specifications, so that the application range of the whole fixture is widened, adjustment is convenient, and the universality of the welding fixture is improved.

Description

A general-purpose welding fixture Technical Field

[0001] This utility model relates to an important structure for welding, and in particular to a general-purpose welding fixture. Background Technology

[0002] Existing welding fixtures typically include jaws to clamp the workpiece to be welded. However, the jaws usually only clamp a small portion of the workpiece, leaving a risk of movement even when clamped, thus hindering reliable welding. Furthermore, they can only clamp and weld a single workpiece at a time. For example, application number 201920391045.4 discloses a welding fixture that uses a rotating pressure plate to press the welding plate, facilitating welding at specific positions. However, this type of welding fixture can only fix one workpiece at a time, making it unsuitable for welding two workpieces together, especially when welding the casing and bracket in an air conditioner. Summary of the Invention

[0003] The purpose of this utility model is to provide a general-purpose welding fixture that can solve at least one of the above problems.

[0004] According to one aspect of the present invention, a general-purpose welding fixture is provided, comprising:

[0005] Base;

[0006] There are two horizontal guide rails, which are arranged parallel to each other on the base.

[0007] There are two longitudinal guide rails, with each end of the longitudinal guide rail located on a transverse guide rail. The longitudinal guide rails are perpendicular to the transverse guide rails.

[0008] The fixing device consists of four devices, with two devices on each longitudinal guide rail. Each fixing device includes a limiting plate, a limiting post, and a mounting base. The limiting plate is located inside the limiting post, and the top of the limiting post is higher than the top of the limiting plate. Both the limiting plate and the limiting post are vertically arranged. The mounting base is located on the longitudinal guide rail, and both the limiting plate and the limiting post are fixed to the mounting base.

[0009] A clamping device is installed on one of the transverse guide rails, and the clamping device is correspondingly installed with the fixing device.

[0010] The base has multiple mounting holes, the transverse guide rail is fixed to the base through the mounting holes, the mounting seat has multiple adjustment holes, the limiting plate is fixed to the mounting seat through the adjustment holes, and the multiple adjustment holes are arranged along the longitudinal direction.

[0011] The beneficial effects of this utility model are as follows: the limiting plate of the fixing device can limit the lower panel workpiece; the limiting post can limit the corresponding upper bracket workpiece, so that both workpieces are limited and fixed on the fixing device; the clamping device can further press the panel workpiece downward to prevent the workpiece from moving, thereby facilitating the fixing of the panel workpiece and the bracket workpiece, and making it easier to weld the two workpieces. The overall structure is simple and the workpiece is easy to place and fix; at the same time, the transverse guide rail can facilitate the adjustment of the distance between the two longitudinal guide rails, thereby using workpieces of different sizes and improving the applicability.

[0012] In some embodiments, the fixing device further includes a rotary pressing cylinder, which is fixed on the mounting base. A limiting post is located between the rotary pressing cylinder and the limiting plate. A connecting rod is provided on the piston rod of the rotary pressing cylinder, and a pressing rod is provided on the connecting rod. The pressing rod is vertically arranged. Thus, by providing a rotary pressing cylinder, it is convenient to drive the pressing rod to rotate and press down. The pressing rod presses the upper workpiece tightly onto the lower workpiece, so that the two workpieces are tightly pressed together, which facilitates welding.

[0013] In some embodiments, the fixing device further includes a top plate, which is disposed on the mounting base and located on one side of the limiting plate. The top plate is L-shaped, and its horizontal edge is provided with a sliding groove. The top plate is fixed to the mounting base through the sliding groove. Thus, through the combined action of the top plate and the limiting plate, the front-back position of the corresponding side of the panel workpiece can be limited, preventing the workpiece from moving during welding, and enabling rapid positioning and placement of the panel workpiece on the fixture.

[0014] In some embodiments, the clamping device includes a mounting bracket, a movable bracket, a first cylinder, and a second cylinder. The mounting bracket is mounted on one of the transverse guide rails, the first cylinder is horizontally mounted on the mounting bracket, the movable bracket is connected to the piston rod of the first cylinder, and the second cylinder is vertically mounted on the movable bracket. Thus, the clamping device can clamp and fix the lower panel workpiece, preventing movement during welding and ensuring welding quality.

[0015] In some embodiments, a general-purpose welding fixture further includes a magnetic base and a first support rod. The magnetic base is magnetically fixed to the base and has a threaded hole. The first support rod has an external thread, and one end of the first support rod engages with the threaded hole. The magnetic base is located between two longitudinal guide rails. There are multiple magnetic bases, and each first support rod corresponds to one of the magnetic bases. Thus, the magnetic base and the first support rod provide multi-point support for the bottom of the panel workpiece, preventing deformation during clamping and welding. Simultaneously, the position of the first support rod on the base can be adjusted using the magnetic base to meet different usage requirements based on the workpiece.

[0016] In some embodiments, a general-purpose welding fixture further includes multiple second support rods, each mounted on two longitudinal guide rails. One end of each second support rod is fixed to a longitudinal guide rail, and the other end is provided with a sleeve. The sleeve is threaded into the second support rod, and the top end of the sleeve is flush with the top end of the first support rod. Thus, the second support rods can support the panel workpiece near its edge, further increasing the support points and preventing deformation of the workpiece.

[0017] In some embodiments, a general-purpose welding fixture further includes a mounting plate, which is vertically arranged and has vertical grooves. Two second cylinders are fixed to a movable frame via these vertical grooves, located at opposite ends of the movable frame. Thus, the vertical grooves on the mounting plate facilitate adjustment of the vertical height of the second cylinders to meet the clamping requirements of different workpieces.

[0018] In some embodiments, a general-purpose welding fixture further includes a transverse pushing cylinder. The cylinder body of the transverse pushing cylinder is fixed to a base, and the piston rod is connected to one of the longitudinal guide rails. The extension and retraction direction of the piston rod of the transverse pushing cylinder is consistent with the length direction of the transverse guide rail. Thus, by providing a transverse pushing cylinder, it is convenient to push the corresponding longitudinal guide rail to move, and it is convenient to adjust the distance between the two longitudinal guide rails.

[0019] In some embodiments, a general-purpose welding fixture further includes a protective cover, on which a mounting base is fixed. The protective cover is mounted on a transverse guide rail via a slider. There are two protective covers corresponding to the longitudinal guide rails, and the longitudinal guide rails are fixed on the protective covers. Thus, by providing a protective cover, the installation of the longitudinal guide rails on the transverse guide rails is facilitated, and the installation of the mounting base is also convenient. Attached Figure Description

[0020] Figure 1 is a structural schematic diagram of a general-purpose welding fixture according to this utility model;

[0021] Figure 2 is a structural schematic diagram of a general-purpose welding fixture of this utility model from another perspective.

[0022] Figure 3 is a structural schematic diagram of the fixing device in a general-purpose welding fixture of this utility model;

[0023] Figure 4 is a structural schematic diagram of the clamping device in a general-purpose welding fixture of this utility model;

[0024] Figure 5 is a schematic diagram of the structure when two workpieces are joined together. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] Referring to Figures 1-4, a general-purpose welding fixture includes:

[0027] Base 1;

[0028] Horizontal guide rail 2, there are two horizontal guide rails 2, which are arranged parallel to each other on the base 1;

[0029] There are two longitudinal guide rails 3, with both ends of the longitudinal guide rails 3 respectively located on the transverse guide rails 2. The longitudinal guide rails 3 and the transverse guide rails 2 are set perpendicularly.

[0030] Fixing device 4, there are four fixing devices 4, two fixing devices 4 are provided on each longitudinal guide rail 3. The fixing device 4 includes a limiting plate 41 and a limiting post 42. The limiting plate 41 is located inside the limiting post 42. The top of the limiting post 42 is higher than the top of the limiting plate 41. The limiting plate 41 and the limiting post 42 are both vertically set.

[0031] The clamping device 5 is located on one of the transverse guide rails 2, and the clamping device 5 is correspondingly set with the fixing device 4.

[0032] In practical use, the base 1 of the universal welding fixture of this utility model can be fixed to the welding machine table by bolts or external structure locking, which facilitates the welding machine table to weld the workpiece fixed on the universal welding fixture. This universal welding fixture is mainly suitable for welding panel workpieces and bracket workpieces (as shown in Figure 5), and can also be used for welding and fixing other workpieces with corresponding structures. The panel workpiece has downward folded edges on both sides. When the panel workpiece is placed, the folded edges on both sides abut against the outside of the corresponding side limiting plates 41. That is, the folded edges can be limited by the two limiting plates 41 on the longitudinal guide rail 3, and the panel workpiece is pressed against the limiting plates 41. After the panel workpiece is placed, the bracket workpiece is placed on top of the panel workpiece. The opening slots at both ends of the bracket workpiece are aligned with the limiting posts 42. The limiting posts 42 are inserted into the opening slots. The limiting posts 42 of the fixing devices 4 at both ends can limit the bracket workpiece.

[0033] After the support workpiece is placed on the panel workpiece, the panel workpiece is pressed down by the clamping device 5 to prevent the workpiece from moving during welding.

[0034] In the actual assembly process, multiple mounting holes 11 are opened on the base 1, and the transverse guide rail 2 is fixed to the base 1 by bolts passing through the mounting holes 11. When the distance between the two transverse guide rails 2 needs to be adjusted, the transverse guide rail 2 is moved to the mounting holes at different positions and then fixed, thereby satisfying the fixing of workpieces of different sizes and improving the applicability.

[0035] The fixing device 4 also includes a mounting base 43, which is mounted on the longitudinal guide rail 3. The limiting plate 41 and the limiting post 42 are both fixed to the mounting base 43. A slider is installed at the bottom of the mounting base 43, which facilitates the engagement between the mounting base 43 and the longitudinal guide rail 3 and allows for easy adjustment of the position of each mounting base 43 on the longitudinal guide rail 3. After the mounting base 43 has moved into position on the longitudinal guide rail 3, the slider is tightened and fixed to the longitudinal guide rail 3 with bolts, thus fixing the position of the mounting base 43. This allows for adjustment of the distance between two mounting bases 43 on the same longitudinal guide rail 3, meeting the fixing requirements of workpieces of different sizes.

[0036] The mounting base 43 is provided with multiple adjustment holes 431. The limiting plate 41 is fixed to the mounting base 43 through the adjustment holes 431. The multiple adjustment holes 431 are arranged along the longitudinal direction, that is, along the length direction of the longitudinal guide rail. By providing multiple adjustment holes 431, the limiting plate 41 can be fixed on the adjustment holes 431 at different positions, thereby facilitating the adjustment of the position of the limiting plate 41 and making it easy to adapt to panel workpieces of different widths.

[0037] The limiting plate 41 is fixed to the mounting base 43 with bolts. During use, the limiting plate 41 of different heights can be replaced according to specific product requirements, and installation and disassembly are convenient. The limiting post 42 is a screw rod, which is directly locked to the mounting base 43 with a nut, making installation convenient.

[0038] The fixing device 4 also includes a rotary pressing cylinder 44, which is fixed on the mounting base 43. The limiting post 42 is located between the rotary pressing cylinder 44 and the limiting plate 41. The piston rod of the rotary pressing cylinder 44 is provided with a connecting rod 45, and the connecting rod 45 is provided with a pressing rod 46, which is vertically arranged.

[0039] The cylinder body of the rotary pressing cylinder 44 is fixed to the mounting base 43 by bolts. After the panel workpiece is placed, the bracket workpiece is placed on the panel workpiece. When the workpiece is being placed, the piston rod of the rotary pressing cylinder 44 drives the connecting rod 45 and the pressing rod 46 to rotate outward to avoid interfering with the placement of the workpiece. After the bracket workpiece is placed, the piston rod of the rotary pressing cylinder 44 rotates, driving the connecting rod 45 and the pressing rod 46 to rotate towards the workpiece. When the pressing rod 46 rotates above the bracket workpiece, the piston rod of the rotary pressing cylinder 44 pulls back, driving the connecting rod 45 and the pressing rod 46 to move downward, so that the pressing rod 46 presses against the bracket workpiece, and the bracket workpiece presses downward against the panel workpiece, which facilitates the welding and fixing of the two workpieces.

[0040] In practical use, to increase the contact area between the pressing rod 46 and the workpiece and reduce the impact wear caused by the pressing rod 46, a washer 48 is fixed at the bottom of the pressing rod 46 to protect the workpiece. A slotted groove is provided on the connecting rod 45. The pressing rod 46 is a screw rod that extends downward through the slotted groove and is tightened to the connecting rod 45 with a nut. The slotted groove allows for adjustment of the position of the pressing rod 46 on the connecting rod 45, thus enabling adjustment of the pressing position of the pressing rod 46 to suit different workpieces.

[0041] The fixing device 4 also includes a top plate 47, which is mounted on the mounting base 43. The top plate 47 is located on one side of the limiting plate 41 and is L-shaped. The horizontal edge of the top plate 47 is provided with a sliding groove 471, and the top plate 47 is fixed to the mounting base 43 through the sliding groove 471. The limiting plate 41 and the top plate 47 can respectively limit the inner and outer sides of the folded edge of the panel workpiece, preventing the workpiece from moving back and forth during welding.

[0042] By providing a top plate 47, the outer position of the panel workpiece can be limited without the need for cylinders or other structures for clamping and fixing, greatly simplifying the structure of the entire fixture and reducing its cost. Simultaneously, a corresponding groove 471 is provided on the top plate 47, allowing screws to pass through the groove 471 before being fixed to the mounting base 43. The groove 471 also allows the top plate 47 to move along its direction, moving it closer to or further away from the limiting plate 41, thereby adjusting the distance between the top plate 47 and the limiting plate 41. This facilitates the application of folded edges of different thicknesses, meeting diverse usage requirements and improving versatility.

[0043] The clamping device 5 includes a mounting frame 51, a movable frame 52, a first cylinder 53, and a second cylinder 54. The mounting frame 51 is mounted on one of the transverse guide rails 2. The first cylinder 53 is horizontally mounted on the mounting frame 51. The movable frame 52 is connected to the piston rod of the first cylinder 53. The second cylinder 54 is vertically mounted on the movable frame 52. The first cylinder 53 can drive the movable frame 52 to move back and forth, and the piston rod of the second cylinder 54 can extend and retract up and down, facilitating the clamping and loosening of the workpiece.

[0044] Specifically, after the workpiece is placed on the fixture, the piston rod of the first cylinder 53 extends, causing the second cylinder 54 to move above the panel workpiece; subsequently, the piston rod of the second cylinder 54 extends downward and presses against the panel workpiece, thereby fixing the panel workpiece and preventing it from moving during welding.

[0045] This utility model provides a general-purpose welding fixture, which also includes a magnetic base 6 and a first support rod 7. The magnetic base 6 is magnetically fixed to the base 1. The magnetic base 6 has a threaded hole, and the first support rod 7 has an external thread. One end of the first support rod 7 is threaded into the threaded hole. The magnetic base 6 is located between two longitudinal guide rails 3. There are multiple magnetic bases 6, and the first support rods 7 are arranged one-to-one with the magnetic bases 6. The first support rod 7 is a screw; the magnetic base 6 is a switch-type magnetic base, and the magnetic attraction of the magnetic base 6 can be controlled by rotating the switch; the base 1 is a metal base, which facilitates the magnetic base 6 to be magnetically fixed to the base 1.

[0046] Before placing the panel workpiece, the first support rod 7 can be twisted to raise or lower the first support rod 7 relative to the magnetic base 6, so that the top of the first support rod 7 is flush with the top of the limiting plate 41. The first support rod 7 can support the middle part of the panel workpiece, which helps to maintain the flatness of the panel workpiece and prevents the panel from deforming during welding, thereby helping to ensure the welding quality.

[0047] A general-purpose welding fixture also includes multiple second support rods 8, each mounted on two longitudinal guide rails 3. One end of each second support rod 8 is fixed to the longitudinal guide rail 3, and the other end is fitted with a sleeve 9. The sleeve 9 is threaded into the second support rod 8, and its top end is flush with the top end of the first support rod 7. The second support rod 8 is a screw, and the sleeve 9 has an internal thread. The sleeve 9 and the second support rod 8 are threaded together. By turning the sleeve 9, its height can be adjusted so that it can support the bottom surface of the panel workpiece. By providing the second support rods 8, the panel workpiece near the edge can be supported, and it is located below the support workpiece. Therefore, during welding, it can better bear the weight and distribute the force, which helps to ensure the flatness of the panel workpiece.

[0048] This utility model provides a general-purpose welding fixture, which also includes a mounting plate 10. The mounting plate 10 is vertically arranged and has a vertical groove 101. Two second cylinders 54 are fixed to a movable frame 52 via the vertical groove 101 of the mounting plate 10. The second cylinders 54 are located at opposite ends of the movable frame 52. During installation, bolts pass through the vertical groove 101 and the movable frame 52 and are then fixed to the cylinder body of the second cylinder 54. When the height of the second cylinder 54 needs adjustment, it can be adjusted up and down along the direction of the vertical groove 101 to accommodate different workpiece clamping requirements. By providing two second cylinders 54, the force can be applied more smoothly to the workpiece, allowing it to be clamped stably.

[0049] A general-purpose welding fixture also includes a transverse pushing cylinder 20. The cylinder body of the transverse pushing cylinder 20 is fixed to the base 1, and the piston rod is connected to one of the longitudinal guide rails 3. The extension and retraction direction of the piston rod of the transverse pushing cylinder 20 is consistent with the length direction of the transverse guide rail 20. The cylinder body of the transverse pushing cylinder 20 is fixed to the mounting hole on the base 1 by bolts. The transverse pushing cylinder 20 can be fixed with mounting holes at different positions, and the position adjustment is convenient, making it suitable for fixing workpieces of different sizes. By extending the piston rod of the transverse pushing cylinder 20, the connected longitudinal guide rail 3 can be pushed, facilitating the adjustment of the distance between the two longitudinal guide rails 3 and adapting to the fixing of workpieces of different sizes and specifications.

[0050] This utility model provides a general-purpose welding fixture, which also includes a protective cover 30. A mounting base 43 is fixed to the protective cover 30. The protective cover 30 is mounted on the transverse guide rail 2 via a slider. There are two protective covers 30 corresponding to the longitudinal guide rails 3, with the longitudinal guide rails 3 fixed to the protective cover 30. A slider is provided at the bottom of the protective cover 30, facilitating its installation on the transverse guide rail 2 and adjustment of its position on the transverse guide rail 2.

[0051] The protective cover 30 facilitates the installation of the mounting base 43. During installation, a mounting baffle 49 is installed at the bottom of the base 43. The two sides of the mounting baffle 49 are folded downwards, and both ends of the mounting baffle 49 are fixed to the two sides of the protective cover 30 with bolts. The protective cover 30 has multiple through holes along its length on both sides, allowing the mounting baffle 49 to be fitted and fixed in different positions, thus facilitating the adjustment and fixation of the mounting base 43 on the longitudinal guide rail.

[0052] This utility model discloses a universal welding fixture. Through the coordination and rational distribution of its various structures, the fixture has a simple structure and facilitates the quick placement and clamping of workpieces on the corresponding structures. The various structures can fix two workpieces, which can then be removed after welding, making operation convenient. Furthermore, the adjustability of the structures allows for the fixing of workpieces of different sizes and specifications, thereby increasing the applicability of the entire fixture, making adjustment convenient, and enhancing the versatility of the welding fixture.

[0053] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A general-purpose welding fixture, characterized in that, include: Base (1); transverse guide rail (2), there are two transverse guide rails (2), which are arranged parallel to each other on the base (1); longitudinal guide rail (3), there are two longitudinal guide rails (3), the two ends of the longitudinal guide rail (3) are respectively arranged on the transverse guide rail (2), and the longitudinal guide rail (3) is arranged perpendicular to the transverse guide rail (2); fixing device (4), there are four fixing devices (4), each of the longitudinal guide rails (3) is provided with two fixing devices (4), the fixing device (4) includes a limiting plate (41), a limiting post (42) and a mounting base (43), the limiting plate (41) is located inside the limiting post (42), the top of the limiting post (42) is higher than the top of the limiting plate (41), the limiting plate (41) is located inside the limiting post (42) and the top of the limiting post (42) is higher than the top of the limiting plate (41). 1) Both the limiting post (42) and the mounting base (43) are vertically arranged. The mounting base (43) is located on the longitudinal guide rail (3). The limiting plate (41) and the limiting post (42) are both fixed on the mounting base (43). The clamping device (5) is located on one of the transverse guide rails (2). The clamping device (5) is correspondingly arranged with the fixing device (4). The base (1) is provided with multiple mounting holes (11). The transverse guide rail (2) is fixed on the base (1) through the mounting holes (11). The mounting base (43) is provided with multiple adjustment holes (431). The limiting plate (41) is fixed to the mounting base (43) through the adjustment holes (431). The multiple adjustment holes (431) are arranged along the longitudinal direction.

2. The universal welding fixture according to claim 1, characterized in that, The fixing device (4) also includes a rotary pressing cylinder (44), which is fixed on the mounting base (43). The limiting post (42) is located between the rotary pressing cylinder (44) and the limiting plate (41). The piston rod of the rotary pressing cylinder (44) is provided with a connecting rod (45), and the connecting rod (45) is provided with a pressing rod (46), which is vertically arranged.

3. A general-purpose welding fixture according to claim 2, characterized in that, The fixing device (4) also includes a top plate (47), which is disposed on the mounting base (43). The top plate (47) is located on one side of the limiting plate (41). The top plate (47) is L-shaped. The horizontal side of the top plate (47) is provided with a sliding groove (471). The top plate (47) is fixed on the mounting base (43) through the sliding groove (471).

4. A general-purpose welding fixture according to any one of claims 1 to 3, characterized in that, The clamping device (5) includes a mounting frame (51), a movable frame (52), a first cylinder (53), and a second cylinder (54). The mounting frame (51) is mounted on one of the transverse guide rails (2). The first cylinder (53) is horizontally mounted on the mounting frame (51). The movable frame (52) is connected to the piston rod of the first cylinder (53). The second cylinder (54) is vertically mounted on the movable frame (52).

5. A general-purpose welding fixture according to claim 4, characterized in that, It also includes a magnetic base (6) and a first support rod (7). The magnetic base (6) is fixed to the base (1) by magnetic attraction. The magnetic base (6) is provided with a threaded hole. The first support rod (7) is provided with an external thread. One end of the first support rod (7) is threadedly engaged with the threaded hole. The magnetic base (6) is located between two longitudinal guide rails (3). There are multiple magnetic bases (6). The first support rod (7) is set one-to-one with the magnetic base (6).

6. A general-purpose welding fixture according to claim 5, characterized in that, It also includes a second support rod (8), there are multiple second support rods (8), which are respectively set on two longitudinal guide rails (3). One end of the second support rod (8) is fixed on the longitudinal guide rail (3), and the other end of the second support rod (8) is provided with a sleeve (9). The sleeve (9) and the second support rod (8) are connected by a thread. The top end of the sleeve (9) is flush with the top end of the first support rod (7).

7. A general-purpose welding fixture according to claim 6, characterized in that, It also includes a mounting plate (10), which is vertically arranged and has a vertical groove (101) on it. The second cylinder (54) is fixed on the movable frame (52) through the vertical groove (101) of the mounting plate (10). There are two second cylinders (54), which are located at both ends of the movable frame (52).

8. A general-purpose welding fixture according to claim 4, characterized in that, It also includes a transverse push cylinder (20), the cylinder body of which is fixed on the base (1), and the piston rod is connected to one of the longitudinal guide rails (3). The extension and retraction direction of the piston rod of the transverse push cylinder (20) is consistent with the length direction of the transverse guide rail (2).

9. A general-purpose welding fixture according to any one of claims 1 to 3, characterized in that, It also includes a protective cover (30), the mounting base (43) is fixed on the protective cover (30), the protective cover (30) is mounted on the transverse guide rail (2) by a slider, the protective cover (30) and the longitudinal guide rail (3) are two in total, and the longitudinal guide rail (3) is fixed on the protective cover (30).

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