Welding equipment suitable for diagonal assembly of various specifications of aluminum profile frames

Abstract

The present invention discloses welding equipment suitable for the diagonal assembly of aluminum profile frames of various specifications. The present invention arranges positioning components on the left and right ends of the welding table. During the initial placement work, the two side frames are diagonally fitted along the right-angled surfaces inside the diagonal mold frame, which can easily realize the assembly and alignment of the two side frames. In conjunction with the diagonal modules inside the diagonal mold frame, the movement and positioning of the side frames play a further guiding role. The two diagonal mold frames are moved closer in both directions until the other diagonal surfaces of the two groups of side frames fit together without additional correction, and the four side frames are quickly assembled, thereby improving work efficiency. The L-shaped diagonal mold frame is adopted to adapt to the assembly of side frames of various specifications and sizes. In addition, the cooperation between the welding mechanism, the electric push cylinder and the horizontal moving component can realize all-round welding of the welding gun on the various joint surfaces of the side frames, thereby replacing manual welding and improving welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum profile frame welding, and more particularly to welding equipment suitable for diagonal assembly of aluminum profile frames of multiple specifications. Background Art

[0002] Aluminum profiles are often used to make window frames, door frames, and other structural frames. Aluminum profile frames are usually composed of four aluminum profiles. Both ends of each aluminum profile are cut into bevels at a 45-degree angle. The contact surfaces of two adjacent aluminum profiles are both bevels. The contact surfaces of the two adjacent aluminum profiles are assembled and welded together to form a rectangular frame.

[0003] The traditional aluminum frame welding equipment is mainly composed of a positioning mechanism and a welding mechanism. The positioning mechanism is used to position the two side frames, splice the four side frames end to end, and then use a specific positioning fixture to position the assembled side frames. Then, a manual hand-held welding gun is used to weld the upper end faces of the joint surfaces of multiple side frames in turn. After the upper welding of the joint surface is completed, the upper and lower positions of the aluminum profile frame need to be exchanged, and then the four welding points on the other side of the aluminum profile frame need to be welded again. Not only does it make the positioning operation and welding process cumbersome, but for side frames of different specifications, the position of the positioning fixture needs to be manually adjusted. Faced with the production of batches of aluminum profile frames, the work efficiency is not high enough.

[0004] To this end, we propose welding equipment suitable for the diagonal assembly of aluminum profile frames of multiple specifications to address existing practical problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that it is difficult to quickly position the edge frame during the existing actual operation and to simplify the overall welding process. Compared with the existing technology, it provides welding equipment suitable for the diagonal assembly of aluminum profile frames of multiple specifications.

[0006] The object of the present invention can be achieved by the following technical solution: a welding device suitable for diagonal assembly of aluminum profile frames of various specifications, comprising a welding table with a base, wherein the upper surface of the welding table is provided with four cross-shaped welding grooves with open ends, and a pair of oppositely arranged welding grooves are each provided with a positioning assembly for positioning two side frames;

[0007] The positioning assembly includes a rotating column that is rotationally driven and installed at the bottom end of the middle part of the welding table, and an electric guide rail that is arranged parallel to the welding transverse groove in the upper and lower directions is fixedly installed on the rotating column. A diagonal mold frame that is movably fitted to the upper end surface of the welding table and can move horizontally along the welding transverse groove is installed on the electric guide rail. A plurality of adsorption holes are opened on the inner end wall of the diagonal mold frame, and an air pump that is connected to the plurality of adsorption holes is fixedly installed on the outer end of the electric guide rail. Two diagonal modules that are slidably installed on the welding table are also provided between a pair of the diagonal mold frames.

[0008] A rotating disk which is arranged concentrically with the welding table is installed on the base for rotational driving, a horizontal moving component is fixedly installed on the rotating disk, electric push cylinders corresponding to the positions of the welding transverse grooves are distributed on the front and rear sides of the horizontal moving component, and a welding mechanism is fixed on the telescopic end of the electric push cylinder for welding the butt joint surfaces of the two side frames.

[0009] Furthermore, the diagonal mold frame is an L-shaped structure, and a detachment groove for flipping the diagonal mold frame downward is provided on the end wall of the welding platform close to the edge.

[0010] Furthermore, the two end faces of the diagonal module close to the diagonal mold frame form a 90° angle, and downwardly extending protrusions are provided on both sides of the bottom end of the diagonal module. The upper end wall of the welding table is provided with a guide groove for horizontal friction sliding of the protrusion. A pair of guide grooves on the same side are symmetrically distributed on both sides of the welding transverse groove. The two diagonal modules are respectively arranged adjacent to the corresponding diagonal mold frames. The addition of a pair of diagonal modules is beneficial to further guide the movement positioning of the side frames and improves the stability of the four side frames after docking and assembly.

[0011] Furthermore, electromagnetic plates are embedded in the two inner walls of the outer end of the welding transverse groove and the inner wall of the guide groove. Magnetic blocks corresponding to the positions of the electromagnetic plates at the welding transverse groove are provided on both sides of the end wall of the electric guide rail. The magnetic blocks are fitted with the electromagnetic plates, and the protrusions are made of magnetic material. In the initial state, a pair of electric guide rails are arranged horizontally, and the electromagnetic plates at the outer ends of the welding transverse grooves are started so that the electric guide rails can be placed stably horizontally. After the four corners of the two sets of side frames are fully assembled and docked, the electromagnetic plates in the guide grooves are started. At this time, the diagonal modules are positioned on the welding table, thereby improving the positioning effect of the diagonal modules on the side frames.

[0012] Furthermore, a drive box located in the front and rear directions of a pair of rotating columns is embedded in the bottom end wall of the welding table, one of the drive boxes is fixedly installed with a drive motor 1 for synchronously rotating the pair of rotating columns in opposite directions, and one of the drive boxes is installed with an engaging gear set for rotating the rotating columns in opposite directions. By using one drive motor 1, the two positioning components can be driven to flip up and down.

[0013] Furthermore, an annular electric guide rail for causing the rotating disk to rotate in a circular motion is embedded on the base.

[0014] Furthermore, the horizontal moving assembly includes a moving seat fixedly mounted on a rotating disk, a bidirectional screw being rotatably mounted in the moving seat, both ends of the bidirectional screw being threadedly sleeved with sliding seats slidably mounted on the inner wall of the moving seat, a pair of sliding seats being respectively fixedly connected to the bottom ends of a pair of electric push cylinders, and a driving motor 2 for rotating the bidirectional screw being fixed at the end of the moving seat.

[0015] Furthermore, the welding mechanism includes an electric arc guide rail fixed on the telescopic end of the electric push cylinder, the electric arc guide rail is provided with an opening toward the side of the welding transverse groove, and a welding gun arranged toward the side of the welding transverse groove is slidably installed on the electric arc guide rail along its circumferential direction. The welding gun is fixedly connected to the slider on the electric arc guide rail through a support frame. When the two sets of positioned side frames move in both directions and connect with each other, a pair of welding mechanisms move in both directions, so that the electric arc guide rail drives the welding gun to move to the welding transverse groove, and the welding gun is used to weld the outer end faces of the docking parts.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] This solution is to set positioning components for positioning the two side frames on both sides of the welding table. During the initial placement work, the two side frames are diagonally fitted together along the right-angled surfaces on the inner sides of the diagonal mold frames, which can easily realize the assembly and alignment of the two side frames. Then, a pair of positioning components are moved closer in both directions until the other diagonal surfaces of the two sets of side frames fit together. No additional correction is required during the movement and assembly of the side frames, and the four side frames can be quickly assembled, thereby improving work efficiency and being suitable for the assembly of side frames of various specifications and sizes. In addition, through the cooperation between the welding mechanism, the electric push cylinder and the horizontal moving component, the welding gun can perform all-round welding on the joint surfaces of the side frames, replacing manual welding and improving welding quality.

[0018] This solution adds a diagonal module installed in a horizontal sliding manner with the welding table on the inner side of a pair of diagonal mold frames, which not only further guides the movement positioning of the side frames, but also improves the stability of the four side frames after docking and assembly. In addition, after using a pair of welding mechanisms to weld two of the docking parts of the two groups of side frames, the diagonal mold frames are driven outward to separate them from the side frames, and then flipped downward to expose the welding transverse grooves there. Finally, the pair of welding mechanisms are rotated 90° using a rotating disk, and the other two docking parts of the two groups of side frames are welded. At this time, the diagonal modules limited to the inside of the welding part play a limiting role on the side frames during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the present invention after two sets of side frames are respectively assembled on the right-angled surfaces of two sets of diagonal mold frames;

[0020] Figure 2 It is a structural schematic diagram of the welding station of the present invention;

[0021] Figure 3 A top view of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the joint of a pair of positioning components of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the welding mechanism of the present invention;

[0024] Figure 6 This is a schematic diagram of the welding work after the two sets of side frames are butt-jointed and assembled. Figure 1 ;

[0025] Figure 7 This is a schematic diagram of the welding work after the two sets of side frames are butt-jointed and assembled. Figure 2 ;

[0026] Figure 8 This is a schematic diagram of the welding work after the two sets of side frames are butt-jointed and assembled. Figure 3 ;

[0027] Figure 9 This is a structural diagram of the present invention after welding two welding locations of two sets of side frames and then withdrawing the welding mechanism outward from the welding transverse groove;

[0028] Figure 10 This is a structural schematic diagram of the present invention when a pair of welding mechanisms are rotated to two other welding transverse grooves;

[0029] Figure 11 This is a schematic diagram of the structure of the present invention when welding the other two welding parts of the two sets of side frames. Figure 1 ;

[0030] Figure 12 This is a schematic diagram of the structure of the present invention when welding the other two welding parts of the two sets of side frames. Figure 2 .

[0031] Description of the numbers in the figure:

[0032] 1. Welding table; 101. Welding horizontal groove; 102. Guide groove; 103. Detachment groove; 2. Side frame; 3. Diagonal mold frame; 301. Adsorption hole; 4. Electric guide rail; 5. Air pump; 6. Rotating column; 7. Drive motor 1; 8. Diagonal module; 9. Rotating disk; 10. Moving seat; 11. Bidirectional screw; 12. Drive motor 2; 13. Electric push cylinder; 14. Electric arc guide rail; 15. Welding gun. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0034] Example 1: The present invention discloses a welding device suitable for diagonal assembly of aluminum profile frames of various specifications. Figure 1-Figure 2 , comprising a welding platform 1 with a base, the upper end surface of the welding platform 1 is provided with four cross-shaped welding grooves 101 with open ends, the four welding grooves 101 are evenly distributed on the four sides of the welding platform 1, and a pair of oppositely arranged welding grooves 101 are provided with positioning components for positioning two adjacent side frames 2;

[0035] See also Figure 1 and Figure 3 、 Figure 4 , the positioning assembly includes a rotating column 6 which is rotationally driven and installed at the bottom end of the middle part of the welding table 1, and an electric guide rail 4 which is arranged vertically and parallel to the welding transverse groove 101 is fixedly installed on the rotating column 6, and a diagonal mold frame 3 which is movably fitted to the upper end surface of the welding table 1 and can move horizontally along the welding transverse groove 101 is installed on the electric guide rail 4, and electromagnetic sheets are embedded on both inner walls of the outer end of the welding transverse groove 101, and magnetic blocks corresponding to the positions of the electromagnetic sheets at the welding transverse groove 101 are provided on both sides of the end wall of the electric guide rail 4, and the magnetic blocks are fitted with the electromagnetic sheets. In the initial state, a pair of electric guide rails 4 are arranged horizontally, and the electromagnetic sheets at the outer ends of the welding transverse groove 101 are started so that the electric guide rail 4 can be stably placed horizontally;

[0036] The diagonal mold frame 3 is an L-shaped structure, and the inner side of the diagonal mold frame 3 is a right-angled surface. A plurality of adsorption holes 301 are opened on the inner end wall of the diagonal mold frame 3, and an air pump 5 connected to the plurality of adsorption holes 301 is fixedly installed on the outer end of the electric guide rail 4. In the initial state, the pair of diagonal mold frames 3 are arranged away from each other.

[0037] During the initial placement work, the two side frames 2 are diagonally fitted along the inner right-angled surfaces of the diagonal mold frame 3, which can easily realize the assembly and alignment of the two side frames 2. Then, the air pump 5 is started, and the multiple adsorption holes 301 are used to adsorb and position the pair of side frames 2 after the initial assembly. In this way, the positioning and installation of another set of side frames 2 are completed. No additional correction is required during the movement and assembly of the side frames 2, and the four side frames 2 can be quickly assembled, thereby improving work efficiency. The L-shaped diagonal mold frame 3 is suitable for side frames 2 of various sizes.

[0038] See also Figure 1 、 Figure 2 and Figure 6A pair of diagonal modules 8 are slidably mounted on the upper end wall of the welding platform 1 between the pair of diagonal mold frames 3. The two end faces of the diagonal module 8 close to the diagonal mold frame 3 form a 90° angle. Both sides of the bottom of the diagonal module 8 are provided with downwardly extending protrusions. The upper end wall of the welding platform 1 is provided with a guide groove 102 for horizontal friction sliding of the protrusion. The pair of guide grooves 102 on the same side are symmetrically distributed on both sides of the welding transverse groove 101. A pair of diagonal modules 8 are added between the pair of diagonal mold frames 3, and the two diagonal modules 8 are respectively arranged adjacent to the corresponding diagonal mold frames 3.

[0039] After a pair of side frames 2 are placed diagonally against the inner wall of the diagonal mold frame 3, the diagonal modules 8 are pushed outward to abut against the inner side surfaces of the pair of side frames 2. Relying on a pair of electric guide rails 4, the two positioned sets of side frames 2 are moved closer to the middle until the other ends of the two are connected. Adding a pair of diagonal modules 8 is beneficial to further guide the movement positioning of the side frames 2 and improve the stability of the four side frames 2 after docking and assembly.

[0040] The inner walls of the guide grooves 102 are also embedded with electromagnetic plates, and the protrusions are made of magnetic material. After the four corners of the two sets of side frames 2 are fully assembled and docked, the electromagnetic plates in the guide grooves 102 are activated. At this time, the diagonal module 8 is positioned on the welding table 1, thereby improving the positioning effect of the diagonal module 8 on the side frame 2.

[0041] See also Figure 5-Figure 6 A rotating disk 9 which is arranged concentrically with the welding table 1 is installed on the base for rotational driving, and a horizontal moving component is fixedly installed on the rotating disk 9. Electric push cylinders 13 corresponding to the positions of the welding transverse grooves 101 are distributed on the front and rear sides of the horizontal moving component. A welding mechanism is fixed on the telescopic end of the electric push cylinder 13 for welding the butt joints of the two side frames 2. The welding mechanism is arranged to move horizontally inward and outward, up and down, and rotate in a circle, so as to improve the all-round welding of the four welding parts of the assembled frame by the welding mechanism and improve the welding flexibility.

[0042] Example 2: Based on Example 1, this example optimizes the structure of the horizontal moving component and the welding mechanism as well as the welding process, as follows:

[0043] See also Figure 6The horizontal moving assembly includes a moving base 10 fixedly mounted on the rotating disk 9, and a bidirectional screw 11 is rotatably mounted in the moving base 10. Both ends of the bidirectional screw 11 are threadedly sleeved with sliding seats that are slidably mounted on the inner wall of the moving base 10. A pair of sliding seats are respectively fixedly connected to the bottom ends of a pair of electric push cylinders 13. A driving motor 12 for rotating the bidirectional screw 11 is fixed to the end of the moving base 10. The center position of the moving base 10 corresponds to the center position of the rotating disk 9, and the length of the bidirectional screw 11 is greater than the diameter length of the welding table 1. The rotation of the bidirectional screw 11 is used to realize bidirectional or reverse movement of a pair of welding mechanisms.

[0044] See also Figure 5 The welding mechanism includes an electric arc guide rail 14 fixed on the telescopic end of the electric push cylinder 13. The electric arc guide rail 14 is provided with an opening toward the side of the welding transverse groove 101. A welding gun 15 is slidably mounted on the electric arc guide rail 14 along its circumferential direction and arranged toward the side of the welding transverse groove 101. The welding gun 15 is fixedly connected to the slider on the electric arc guide rail 14 through a support frame.

[0045] See also Figure 6-Figure 8 When the two sets of positioned side frames 2 move in both directions and are brought into contact with each other, a pair of welding mechanisms move in both directions, so that the electric arc guide rail 14 drives the welding gun 15 to move to the welding horizontal groove 101. The welding nozzle of the welding gun 15 is vertically downward and corresponds to the position of the upper butt joint surface of the side frame 2. The electric push cylinder 13 is used to move horizontally to realize the welding gun 15 welding the upper butt joint surface of the side frame 2;

[0046] Then, the welding gun 15 is rotated to a horizontal position with the welding transverse groove 101 by the electric arc guide rail 14, and then the electric push cylinder 13 is moved up and down to enable the welding gun 15 to weld the side butt joint surface of the side frame 2. Finally, the welding gun 15 is rotated to the bottom of the welding transverse groove 101 by the electric arc guide rail 14, and the welding nozzle of the welding gun 15 is vertically upward. The electric push cylinder 13 is used to move horizontally to enable the welding gun 15 to weld the lower butt joint surface of the side frame 2, completing the multi-directional welding of the butt joint surface of the side frame 2 without manual welding, thereby improving the welding quality.

[0047] The pair of positioning components on the left and right are both designed to be reversible. Figure 3 、 Figure 4 A driving box is embedded in the bottom end wall of the welding table 1 and is located in the front and rear directions of a pair of rotating columns 6. A driving motor 7 is fixedly installed on one of the driving boxes for rotating the pair of rotating columns 6 in opposite directions and synchronously. A meshing gear set for rotating the rotating columns 6 in opposite directions is installed in one of the driving boxes. By using a driving motor 7, the two positioning components can be driven to flip up and down.

[0048] After welding two butt joints of the two side frames 2 using a pair of welding mechanisms, refer to Figure 9-10, drive the diagonal mold frame 3 outward to separate it from the side frame 2, and a detachment groove 103 for flipping the diagonal mold frame 3 downward is opened on the end wall of the welding table 1 near the edge. After the diagonal mold frame 3 is retracted to the detachment groove 103, the pair of positioning components are flipped downward by the cooperation of 7 and the rotating column 6, exposing the other two sets of welding transverse grooves 101;

[0049] See also Figure 10-12 Finally, use the rotating disk 9 to rotate the pair of welding mechanisms 90 degrees, and the pair of welding mechanisms are rotated to the other two welding horizontal grooves 101. At this time, the same welding method as above is used. First, start the driving motor 2 12. The two-way screw 11 rotates to make the pair of electric push cylinders 13 move toward each other until the welding gun 15 located on the electric arc guide 14 is located at the lower end surface of the docking part of the side frame 2.

[0050] In this way, through the cooperation of the horizontal moving component, the electric push cylinder 13 and the electric arc guide rail 14, the lower end faces, side end faces and upper end faces of the other two docking parts of the two groups of side frames 2 are welded in sequence. At this time, the diagonal module 8 limited to the inner side of the welding part plays a limiting role on the side frame 2 during the welding process, preventing the side frame 2 from shifting during the welding process.

[0051] In summary, positioning components for positioning two adjacent side frames 2 are provided on both sides of the welding table 1. During the initial placement work, the two side frames 2 are diagonally fitted along the inner right-angled surfaces of the diagonal mold frames 3, so that the assembly and alignment of the two side frames 2 can be easily achieved. Then, a pair of positioning components are moved closer in both directions until the other diagonal surfaces of the two sets of side frames 2 are fitted together. A diagonal module 8 horizontally slidably mounted on the welding table 1 is added to the inner side of the pair of diagonal mold frames 3. This not only further guides the movement and positioning of the side frames 2, but also improves the stability of the four side frames 2 after docking and assembly. No additional correction is required during the movement and assembly of the side frames 2, so that the four side frames 2 can be quickly assembled, thereby improving work efficiency and being suitable for side frames 2 of various sizes.

[0052] In addition, through the cooperation between the welding mechanism, the electric push cylinder 13 and the horizontal moving component, the welding gun 15 can perform all-round welding on the various docking surfaces of the side frame 2, replacing manual welding, which not only improves the welding quality but is also suitable for mass production.

[0053] The above are only preferred specific implementation methods of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved conception of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A welding device suitable for diagonal assembly of frames of various specifications of aluminum profiles, comprising a welding table (1) with a base, characterized in that: The upper end surface of the welding table (1) is provided with four cross-shaped welding transverse grooves (101) with open ends, and a pair of oppositely arranged welding transverse grooves (101) are each provided with a positioning assembly for positioning the two side frames (2); The positioning assembly includes a rotating column (6) which is rotationally driven and mounted on the bottom end of the middle portion of the welding table (1); an electric guide rail (4) which is arranged parallel to the welding transverse groove (101) is fixedly mounted on the rotating column (6); a diagonal mold frame (3) which is movably fitted to the upper end surface of the welding table (1) is mounted on the electric guide rail (4); a plurality of adsorption holes (301) are provided on the inner end wall of the diagonal mold frame (3); and an air pump (5) which is connected to the plurality of adsorption holes (301) is fixedly mounted on the outer end of the electric guide rail (4); and two diagonal modules (8) which are slidably mounted on the welding table (1) are further arranged between a pair of the diagonal mold frames (3); A rotating disk (9) arranged concentrically with the welding table (1) is installed on the base for rotational driving, a horizontal moving assembly is fixedly installed on the rotating disk (9), electric push cylinders (13) corresponding to the positions of the welding transverse grooves (101) are distributed on both the front and rear sides of the horizontal moving assembly, and a welding mechanism is fixed on the telescopic end of the electric push cylinder (13) for welding the butt joint surfaces of the two side frames (2); The diagonal mold frame (3) is an L-shaped structure, and a detachment groove (103) for turning the diagonal mold frame (3) downward is provided on the end wall of the welding platform (1) close to the edge, and the two end faces of the diagonal module (8) close to the diagonal mold frame (3) form a 90° included angle, and both sides of the bottom end of the diagonal module (8) are provided with downwardly extending protrusions, and the upper end wall of the welding platform (1) is provided with a guide groove (102) for the protrusion to slide horizontally with friction; A driving box is embedded in the bottom end wall of the welding table (1) and is located in the front and rear directions of a pair of rotating columns (6). A driving motor (7) for rotating the pair of rotating columns (6) in opposite directions is fixedly installed on one of the driving boxes. A meshing gear set for rotating the rotating columns (6) in opposite directions is installed in one of the driving boxes. The welding mechanism includes an electric arc guide rail (14) fixed on the telescopic end of the electric push cylinder (13). The electric arc guide rail (14) is provided with an opening toward the side of the welding transverse groove (101). A welding gun (15) is slidably installed on the electric arc guide rail (14) along its circumferential direction and is arranged toward the side of the welding transverse groove (101).

2. The welding equipment suitable for diagonal assembly of aluminum profile frames of various specifications according to claim 1 is characterized in that: Electromagnetic sheets are embedded and installed on the opposite inner walls of the outer ends of the welding transverse groove (101) and the inner walls of the guide groove (102). Magnetic blocks corresponding to the positions of the electromagnetic sheets at the welding transverse groove (101) are provided on both sides of the end walls of the electric guide rail (4). The magnetic blocks are fitted with the electromagnetic sheets, and the protrusions are made of magnetic material.

3. The welding equipment suitable for diagonal assembly of frames of various specifications of aluminum profiles according to claim 1 is characterized in that: An annular electric guide rail for causing the rotating disk (9) to rotate in a circular motion is embedded and installed on the base.

4. The welding equipment suitable for diagonal assembly of frames of aluminum profiles of various specifications according to claim 3 is characterized in that: The horizontal moving assembly includes a moving seat (10) fixedly mounted on a rotating disk (9), a bidirectional screw (11) rotatably mounted in the moving seat (10), both ends of the bidirectional screw (11) being threadedly sleeved with sliding seats slidably mounted on the inner wall of the moving seat (10), a pair of sliding seats being fixedly connected to the bottom ends of a pair of electric push cylinders (13), and a driving motor (12) for rotating the bidirectional screw (11) being fixed at the end of the moving seat (10).

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