Small-diameter tube welding clamp tool

Abstract

The present application discloses a small-diameter pipe welding clamp tool, and belongs to the technical field of clamp tools, which comprises a supporting bottom plate, a heavy horizontal type quick clamp provided above the supporting bottom plate, an angle iron block fixed to the upper end surface of the supporting bottom plate, and a position adjusting mechanism provided above the supporting bottom plate, wherein the position adjusting mechanism comprises an adjusting sliding box, a first adjusting arm, a first pressing plate, a second adjusting arm, a second pressing plate, and a distance adjusting assembly, the adjusting sliding box is fixed to the tabletop of the supporting bottom plate, the first adjusting arm is slidingly connected to the adjusting sliding box, and the second adjusting arm is rotatably connected to the adjusting sliding box; the position adjusting mechanism can control the first pressing plate to approach the second pressing plate, the second adjusting arm can continuously approach the second pressing plate to shrink the clamping opening and clamp and limit the pipe from both ends, and the upper clamping and limiting mode in cooperation with the pressing head can ensure the stability of the pipe during the welding process.

Description

Technical Field

[0001] This invention belongs to the field of fixture and tooling technology, and particularly relates to small-diameter pipe welding fixtures and tooling. Background Technology

[0002] In the pipe processing area of ​​the processing workshop, the production volume of small-diameter pipes is relatively large, especially the pipes under the line that need to be bent, branched, and flanged, resulting in varying lengths, shapes, and complex welding positions.

[0003] In offline welding operations, these pipes are simply placed on a platform for welding or people squat on the ground. Although welding can be carried out, the workpiece is prone to shaking during the welding process. Inappropriate welding positions and restrictions on human limb movements cause welding instability and affect welding quality. Therefore, small-diameter pipe welding fixtures are needed to solve the problems existing in the current technology. Summary of the Invention

[0004] The purpose of this invention is to provide a welding fixture for small-diameter pipes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a small-diameter pipe welding fixture, including a support base plate, a heavy-duty horizontal quick clamp is provided above the support base plate, and an angle iron block is fixed on the upper end face of the support base plate. Through the heavy-duty horizontal quick clamp, the pipe can be effectively and reliably fixed to prevent it from shaking. During welding, the weld seam of the pipe can be rotated to a suitable welding position without being restricted by position, making welding more flexible and free, effectively improving the stability of welding and improving the welding quality.

[0006] A position adjustment mechanism is provided above the support base plate. The position adjustment mechanism includes an adjustment slide box, a first adjustment arm, a first pressure plate, a second adjustment arm, a second pressure plate, and a distance adjustment component. The adjustment slide box is fixed on the platform of the support base plate. The first adjustment arm is slidably connected to the adjustment slide box, and the second adjustment arm is rotatably connected to the adjustment slide box. The first pressure plate is fixed to one end of the first adjustment arm, and the second pressure plate is fixed to one end of the second adjustment arm. The distance adjustment component is located inside the adjustment slide box. Through the position adjustment mechanism, the first pressure plate can be controlled to move closer to the second pressure plate. As the second adjustment arm moves closer to the second pressure plate, it can retract the clamping opening and clamp and limit the pipe from both ends. The clamping and limiting method from above, combined with the clamping head, can ensure the stability of the pipe during the welding process.

[0007] It should be noted in the solution that the adjusting slide box includes an adjusting slider and an adjusting screw. The adjusting slide box has an adjusting groove inside. The adjusting slider is slidably connected in the adjusting groove of the adjusting slide box. The adjusting screw is rotatably connected inside the adjusting slide box. One end face of the adjusting slider has an adjusting screw hole. The adjusting screw is threadedly connected to the adjusting screw hole of the adjusting slider. One end of the first adjusting arm is fixed on one side surface of the adjusting slider.

[0008] It is worth noting that the inner wall of the adjusting slide box is fixed with a rotating bearing, one end of the adjusting screw extending out of the adjusting slide box is fixed with a drive motor, the upper end face of the adjusting slide box is provided with a clearance groove, the inner side wall of the adjusting slide box where the clearance groove is located is provided with a receiving hole, the receiving hole is connected to the clearance groove, and one end of the second adjusting arm is rotatably connected in the clearance groove of the adjusting slide box.

[0009] Furthermore, an automatic tilting mechanism is provided below the adjusting slide box. This mechanism includes a translation bracket, a flipping tray, a tilt adjustment frame, and a torsion spring. The translation bracket is fixed to one side of the adjusting slide box. The flipping tray is rotatably connected to one side of the supporting base plate. The tilt adjustment frame is located on one side of the flipping tray. The torsion spring is located below the flipping tray and the supporting base plate. Through the automatic tilting mechanism, the horizontal position of the pipe can be adjusted by controlling the first pressure plate to advance again. At the same time, the pushing action of the first pressure plate during unloading can achieve the purpose of automatic unloading. The translation bracket slides along the tilt adjustment frame to apply pressure to the flipping tray and overcome the torsion of the torsion spring. Meanwhile, the flipping tray is rotatably connected to the supporting base plate. In this way, when the flipping tray switches to a tilted state, it is convenient for the pipe to slide down the slope to the ground, thereby reducing the tedious operation of manually removing the pipe from a height when unloading.

[0010] As a preferred embodiment, a connecting bracket is fixed to one side surface of the flip tray, one end of the tilt adjustment frame is fixed to the connecting bracket, and the lower end of the translation bracket is attached to the tilt adjustment frame.

[0011] As a preferred embodiment, a flipping groove is formed through one side surface of the support base plate, and a flipping shaft is fixed to one end of the flipping tray, with the flipping shaft rotatably connected to the flipping groove.

[0012] As a preferred embodiment, both the lower ends of the flip tray and the supporting base plate are fixed with fixed supports, and the two ends of the torsion spring are respectively fixed on the corresponding fixed supports.

[0013] As a preferred embodiment, the angle iron block has an angle iron positioning groove inside, and a pressing abutment is provided above the angle iron positioning groove.

[0014] As a preferred embodiment, the horizontal support end of the heavy-duty horizontal quick clamp is provided with a lifting screw, and the surface of the lifting screw is threaded with positioning nuts above and below the horizontal support of the heavy-duty horizontal quick clamp.

[0015] As a preferred embodiment, the clamping abutment is fixed to the lower end of the lifting screw, a gap is provided between the clamping abutment and the inner bottom wall of the angle iron positioning groove, a lifting frame is provided below the supporting base plate, a supporting base is fixed to the lower end of the lifting frame, and a locking knob is provided on the surface of the lifting frame.

[0016] Compared with the prior art, the small-diameter pipe welding fixture provided by the present invention has at least the following beneficial effects:

[0017] The heavy-duty horizontal quick clamp effectively and reliably secures the pipe, preventing it from shaking. During welding, the pipe's weld seam can be rotated to the appropriate welding position without being restricted by its location, allowing for more flexible and free welding, effectively improving welding stability and quality.

[0018] The position adjustment mechanism allows the first pressure plate to be moved closer to the second pressure plate. As the second adjustment arm moves closer to the second pressure plate, it can retract the clamping opening and clamp and limit the pipe from both ends. Combined with the clamping head, the clamping and limiting method from above can ensure the stability of the pipe during the welding process.

[0019] The automatic tilting mechanism allows the first pressure plate to be moved forward again to adjust the horizontal position of the pipe. At the same time, the pushing action of the first pressure plate during unloading enables automatic unloading. The sliding support along the tilt adjustment frame applies pressure to the flipping pallet and overcomes the torque of the torsion spring. The flipping pallet is rotatably connected to the support base plate, so that when the flipping pallet is switched to the tilted state, the pipe can slide down the slope to the ground, thereby reducing the tedious operation of manually removing the pipe from a height during unloading. Attached Figure Description

[0020] Figure 1 This is a perspective view of the overall structure of the present invention;

[0021] Figure 2 This is a perspective view of the lifting frame structure of the present invention;

[0022] Figure 3 This is a perspective view of the position adjustment mechanism structure of the present invention;

[0023] Figure 4 This is a perspective view of the cross-sectional structure of the adjusting slide box of the present invention;

[0024] Figure 5 This is a perspective view of the adjustable groove structure of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0026] Figure 7 This is a perspective view of the first pressure plate structure of the present invention;

[0027] Figure 8 This is a perspective view of the torsion spring structure of the present invention;

[0028] Figure 9 This is a perspective view of the supporting base plate structure of the present invention;

[0029] Figure 10 For the present invention Figure 2 Enlarged view of section B in the middle.

[0030] In the diagram: 1. Support base plate; 2. Lifting stand; 3. Support base; 4. Locking knob; 5. Heavy-duty horizontal quick clamp; 6. Lifting screw; 7. Positioning nut; 8. Pressing butt; 9. Angle iron block; 10. Angle iron positioning groove; 11. Position adjustment mechanism; 12. Adjusting slide box; 13. First adjusting arm; 14. First pressure plate; 15. Second adjusting arm; 16. Second pressure plate; 17. Adjustment assembly; 18. Adjustment slider; 19. Adjustment screw; 20. Rotary bearing; 21. Drive motor; 22. Adjustment slide groove; 23. Clearance groove; 24. Rotation hole; 25. Adjustment screw hole; 26. Automatic tilting mechanism; 27. Translation bracket; 28. Flipping tray; 29. ​​Flipping groove; 30. Flipping shaft; 31. Torsion spring; 32. Connecting bracket; 33. Tilting adjustment frame; 34. Fixed support. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Specific Implementation Example 1

[0033] Please see Figure 1-10This invention provides a small-diameter pipe welding fixture, including a support base plate 1, a heavy-duty horizontal quick clamp 5 above the support base plate 1, an angle iron block 9 fixed to the upper end face of the support base plate 1, and a position adjustment mechanism 11 above the support base plate 1. The position adjustment mechanism 11 includes an adjustment slide box 12, a first adjustment arm 13, a first pressure plate 14, a second adjustment arm 15, a second pressure plate 16, and a distance adjustment component 17. The adjustment slide box 12 is fixed on the table surface of the support base plate 1. The first adjustment arm 13 is slidably connected to the adjustment slide box 12, and the second adjustment arm 15 is rotatably connected to the adjustment slide box 12. The first pressure plate 14 is fixed to one end of the first adjustment arm 13, and the second pressure plate 16 is fixed to one end of the second adjustment arm 15. The distance adjustment component 17 is disposed inside the adjustment slide box 12.

[0034] It is worth noting that the adjusting slide box 12 includes an adjusting slider 18 and an adjusting screw 19. An adjusting groove 22 is provided inside the adjusting slide box 12. The adjusting slider 18 is slidably connected in the adjusting groove 22 of the adjusting slide box 12. The adjusting screw 19 is rotatably connected inside the adjusting slide box 12. An adjusting screw hole 25 is provided on one end face of the adjusting slider 18. The adjusting screw 19 is threadedly connected to the adjusting screw hole 25 of the adjusting slider 18. One end of the first adjusting arm 13 is fixed on one side surface of the adjusting slider 18.

[0035] It is worth noting that the horizontal support end of the heavy-duty horizontal quick clamp 5 is provided with a lifting screw 6, and the surface of the lifting screw 6 is threaded with positioning nuts 7 above and below the horizontal support of the heavy-duty horizontal quick clamp 5.

[0036] It is worth noting that the pressing head 8 is fixed at the lower end of the lifting screw 6, and a gap is provided between the pressing head 8 and the inner bottom wall of the angle iron positioning groove 10. A lifting frame 2 is provided below the support base plate 1, and a support base 3 is fixed at the lower end of the lifting frame 2. A locking knob 4 is provided on the surface of the lifting frame 2.

[0037] This solution includes the following working process: Select a suitable welding height based on the welding position of the pipe and adjust the locking knob 4 to facilitate movement. Place the pipe in the angle iron positioning groove 10 of the angle iron block 9. Adjust the position of the clamping head 8 according to the diameter of the pipe to ensure that the force is applied vertically to the middle of the pipe. After selecting a suitable welding position according to the weld space, press down the handle. When the handle is horizontal, it indicates that it is clamped and welding can begin. After welding, lift the handle and remove the welded pipe.

[0038] As can be seen from the above working process, the use of clamps can effectively and reliably fix the pipe and prevent it from shaking. During welding, the weld seam of the pipe can be rotated to a suitable welding position without being restricted by the position. Welding is more flexible and free, which effectively improves the stability of welding and improves the welding quality. Specific Implementation Example 2

[0040] Please see Figure 1-10 This invention provides a small-diameter pipe welding fixture, including a support base plate 1, a heavy-duty horizontal quick clamp 5 above the support base plate 1, an angle iron block 9 fixed to the upper end face of the support base plate 1, and a position adjustment mechanism 11 above the support base plate 1. The position adjustment mechanism 11 includes an adjustment slide box 12, a first adjustment arm 13, a first pressure plate 14, a second adjustment arm 15, a second pressure plate 16, and a distance adjustment component 17. The adjustment slide box 12 is fixed on the table surface of the support base plate 1. The first adjustment arm 13 is slidably connected to the adjustment slide box 12, and the second adjustment arm 15 is rotatably connected to the adjustment slide box 12. The first pressure plate 14 is fixed to one end of the first adjustment arm 13, and the second pressure plate 16 is fixed to one end of the second adjustment arm 15. The distance adjustment component 17 is disposed inside the adjustment slide box 12.

[0041] It is worth noting that a rotating bearing 20 is fixed to the inner wall of the adjusting slide box 12, and a drive motor 21 is fixed to one end of the adjusting screw 19 extending out of the adjusting slide box 12. A clearance groove 23 is provided on the upper end face of the adjusting slide box 12, and a receiving hole 24 is provided on the inner side wall where the clearance groove 23 of the adjusting slide box 12 is located. The receiving hole 24 is connected to the clearance groove 23, and one end of the second adjusting arm 15 is rotatably connected in the clearance groove 23 of the adjusting slide box 12.

[0042] It is worth noting that the horizontal support end of the heavy-duty horizontal quick clamp 5 is provided with a lifting screw 6, and the surface of the lifting screw 6 is threaded with positioning nuts 7 above and below the horizontal support of the heavy-duty horizontal quick clamp 5.

[0043] It is worth noting that the pressing head 8 is fixed at the lower end of the lifting screw 6, and a gap is provided between the pressing head 8 and the inner bottom wall of the angle iron positioning groove 10. A lifting frame 2 is provided below the support base plate 1, and a support base 3 is fixed at the lower end of the lifting frame 2. A locking knob 4 is provided on the surface of the lifting frame 2.

[0044] The solution has the following working process: When in use, the drive motor 21 is turned on, which drives the adjusting screw 19 to rotate inside the adjusting slide box 12. The adjusting slider 18, which is threadedly connected to the adjusting screw 19, slides along the adjusting slide groove 22 of the adjusting slide box 12. This can control the first pressure plate 14 to move closer to the second pressure plate 16. The second adjusting arm 15 continuously moves closer to the second pressure plate 16, which can shrink the clamping opening and clamp and limit the pipe from both ends. With the clamping head 8, the clamping and limiting method from above can ensure the stability of the pipe during the welding process.

[0045] According to the above working process, the first pressure plate 14 can be controlled to approach the second pressure plate 16, and the second adjusting arm 15 can continuously approach the second pressure plate 16 to shrink the clamping port and clamp and limit from both ends of the pipe. With the clamping head 8, the clamping and limiting method from above can ensure the stability of the pipe during the welding process. Specific Implementation Example 3

[0047] Please see Figure 1-10 This invention provides a small-diameter pipe welding fixture, including a support base plate 1, a heavy-duty horizontal quick clamp 5 above the support base plate 1, an angle iron block 9 fixed to the upper end face of the support base plate 1, and a position adjustment mechanism 11 above the support base plate 1. The position adjustment mechanism 11 includes an adjustment slide box 12, a first adjustment arm 13, a first pressure plate 14, a second adjustment arm 15, a second pressure plate 16, and a distance adjustment component 17. The adjustment slide box 12 is fixed on the table surface of the support base plate 1. The first adjustment arm 13 is slidably connected to the adjustment slide box 12, and the second adjustment arm 15 is rotatably connected to the adjustment slide box 12. The first pressure plate 14 is fixed to one end of the first adjustment arm 13, and the second pressure plate 16 is fixed to one end of the second adjustment arm 15. The distance adjustment component 17 is disposed inside the adjustment slide box 12.

[0048] It is worth noting that an automatic tilting mechanism 26 is provided below the adjusting slide box 12. The automatic tilting mechanism 26 includes a translation bracket 27, a flipping tray 28, a tilt adjustment frame 33, and a torsion spring 31. The translation bracket 27 is fixed on one side surface of the adjusting slide box 12. The flipping tray 28 is rotatably connected to one side of the supporting base plate 1. The tilt adjustment frame 33 is located on one side of the flipping tray 28. The torsion spring 31 is located below the flipping tray 28 and the supporting base plate 1.

[0049] It is worth noting that a connecting bracket 32 ​​is fixed on one side surface of the flip tray 28, one end of the tilt adjustment bracket 33 is fixed on the connecting bracket 32, and the lower end of the translation bracket 27 is attached to the tilt adjustment bracket 33.

[0050] It is worth noting that a flip groove 29 is provided through one side surface of the support base plate 1, and a flip shaft 30 is fixed to one end of the flip tray 28. The flip shaft 30 is rotatably connected to the flip groove 29.

[0051] It is worth noting that both the lower ends of the flip plate 28 and the support base plate 1 are fixed with fixed supports 34, and the two ends of the torsion spring 31 are respectively fixed on the corresponding fixed supports 34.

[0052] It is worth noting that the angle iron block 9 has an angle iron positioning groove 10 inside, and a pressing head 8 is provided above the angle iron positioning groove 10.

[0053] It is worth noting that the horizontal support end of the heavy-duty horizontal quick clamp 5 is provided with a lifting screw 6, and the surface of the lifting screw 6 is threaded with positioning nuts 7 above and below the horizontal support of the heavy-duty horizontal quick clamp 5.

[0054] It is worth noting that the pressing head 8 is fixed at the lower end of the lifting screw 6, and a gap is provided between the pressing head 8 and the inner bottom wall of the angle iron positioning groove 10. A lifting frame 2 is provided below the support base plate 1, and a support base 3 is fixed at the lower end of the lifting frame 2. A locking knob 4 is provided on the surface of the lifting frame 2.

[0055] This solution has the following working process: After use, rotate the second adjusting arm 15 upward and drive the second pressure plate 16 to rotate away from the area of ​​the adjusting slide box 12. This controls the first pressure plate 14 to move forward again, which can adjust the horizontal position of the pipe. At the same time, the pushing action of the first pressure plate 14 during unloading can achieve the purpose of automatic unloading. When the adjusting slider 18 continues to move forward, the translation bracket 27 slides along the tilt adjustment frame 33, which can apply pressure to the flipping tray 28 and overcome the torque of the torsion spring 31. At the same time, the flipping tray 28 is rotatably connected to the support base plate 1. This allows the flipping tray 28 to switch to an inclined state, which makes it convenient for the pipe to slide down the slope to the ground, thereby reducing the tedious operation of manually removing the pipe from a high place when unloading.

[0056] According to the above working process, controlling the first pressure plate 14 to move forward again can adjust the horizontal position of the pipe. At the same time, the pushing action of the first pressure plate 14 during unloading can achieve the purpose of automatic unloading. The sliding support 27 along the tilt adjustment frame 33 can apply pressure to the flipping tray 28 and overcome the torque of the torsion spring 31. At the same time, the flipping tray 28 is rotatably connected to the support base plate 1. In this way, the flipping tray 28 switches to the tilted state, which makes it convenient for the pipe to slide down the slope to the ground, thereby reducing the tedious operation of manually removing the pipe from a high place when unloading.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Although embodiments of the present invention have been shown and described, this does not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of this invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this invention. Regarding the embodiments of the present invention, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small-diameter pipe welding fixture, including a supporting base plate (1), characterized in that: A heavy-duty horizontal quick clamp (5) is provided above the support base plate (1). An angle iron block (9) is fixed on the upper end face of the support base plate (1). A position adjustment mechanism (11) is provided above the support base plate (1). The position adjustment mechanism (11) includes an adjustment slide box (12), a first adjustment arm (13), a first pressure plate (14), a second adjustment arm (15), a second pressure plate (16), and a distance adjustment component (17). The adjustment slide box (12) is fixed on the table surface of the support base plate (1). The first adjustment arm (13) is slidably connected to the adjustment slide box (12). The second adjustment arm (15) is rotatably connected to the adjustment slide box (12). The first pressure plate (14) is fixed to one end of the first adjustment arm (13). The second pressure plate (16) is fixed to one end of the second adjustment arm (15). The distance adjustment component (17) is located inside the adjustment slide box (12).

2. The small-diameter pipe welding fixture according to claim 1, characterized in that: The adjusting slide box (12) includes an adjusting slider (18) and an adjusting screw (19). An adjusting groove (22) is provided inside the adjusting slide box (12). The adjusting slider (18) is slidably connected in the adjusting groove (22) of the adjusting slide box (12). The adjusting screw (19) is rotatably connected inside the adjusting slide box (12). An adjusting screw hole (25) is provided on one end face of the adjusting slider (18). The adjusting screw (19) is threadedly connected to the adjusting screw hole (25) of the adjusting slider (18). One end of the first adjusting arm (13) is fixed on one side surface of the adjusting slider (18).

3. The small-diameter pipe welding fixture according to claim 2, characterized in that: The inner wall of the adjusting slide box (12) is fixed with a rotating bearing (20), and the end of the adjusting screw (19) extending out of the adjusting slide box (12) is fixed with a drive motor (21). The upper end face of the adjusting slide box (12) is provided with a clearance groove (23). The inner side wall of the clearance groove (23) of the adjusting slide box (12) is provided with a receiving hole (24). The receiving hole (24) is connected to the clearance groove (23). One end of the second adjusting arm (15) is rotatably connected in the clearance groove (23) of the adjusting slide box (12).

4. The small-diameter pipe welding fixture according to claim 3, characterized in that: An automatic tilting mechanism (26) is provided below the adjusting slide box (12). The automatic tilting mechanism (26) includes a translation bracket (27), a flip plate (28), a tilt adjustment frame (33), and a torsion spring (31). The translation bracket (27) is fixed on one side surface of the adjusting slide box (12). The flip plate (28) is rotatably connected to one side of the supporting base plate (1). The tilt adjustment frame (33) is located on one side of the flip plate (28). The torsion spring (31) is located below the flip plate (28) and the supporting base plate (1).

5. The small-diameter pipe welding fixture according to claim 4, characterized in that: A connecting bracket (32) is fixed on one side surface of the flip tray (28), one end of the tilt adjustment frame (33) is fixed on the connecting bracket (32), and the lower end of the translation bracket (27) is attached to the tilt adjustment frame (33).

6. The small-diameter pipe welding fixture according to claim 5, characterized in that: A flip groove (29) is provided through one side surface of the support base plate (1), and a flip shaft (30) is fixed at one end of the flip tray (28). The flip shaft (30) is rotatably connected to the flip groove (29).

7. The small-diameter pipe welding fixture according to claim 6, characterized in that: The lower ends of the flip tray (28) and the support base plate (1) are both fixed with fixed supports (34), and the two ends of the torsion spring (31) are respectively fixed on the corresponding fixed supports (34).

8. The small-diameter pipe welding fixture according to claim 7, characterized in that: An angle iron block (9) has an angle iron positioning groove (10) inside, and a pressing head (8) is provided above the angle iron positioning groove (10).

9. The small-diameter pipe welding fixture according to claim 8, characterized in that: The heavy-duty horizontal quick clamp (5) has a lifting screw (6) at the end of its horizontal support. The surface of the lifting screw (6) is threaded with positioning nuts (7) above and below the horizontal support of the heavy-duty horizontal quick clamp (5).

10. The small-diameter pipe welding fixture according to claim 9, characterized in that: The pressing head (8) is fixed at the lower end of the lifting screw (6). A gap is provided between the pressing head (8) and the inner bottom wall of the angle iron positioning groove (10). A lifting frame (2) is provided below the supporting base plate (1). A supporting base (3) is fixed at the lower end of the lifting frame (2). A locking knob (4) is provided on the surface of the lifting frame (2).

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