A screw clamp for splicing building templates

Abstract

The present invention relates to the field of building construction technology, and in particular to a spiral clamp for splicing building templates. After assembly, the movable rod is axially retreated along the central axis of the through hole, the U-shaped clamp is inserted into the inner frames of two building templates, and the movable rod is axially pushed along the central axis of the through hole, and then the movable rod is spirally pushed, so that the two ears are symmetrically and balancedly spirally pushed on the spiral surface, and the end faces of the two ears close to the first side wall are in contact with the corresponding inclined parts, so that the two building template frames between the movable clamp plate and the third side wall of the U-shaped clamp generate sufficient clamping force, clamp the frames of the two building templates, and realize the complete splicing of the building template. The spiral clamp has the advantages of quick installation and labor-saving demoulding.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a spiral clamp used for splicing building templates. Background Art

[0002] Building formwork is a turnover material frequently used in the construction industry. When building formwork is spliced ​​and combined, a formwork clamp is used. At present, the formwork clamp uses a combination tool of T-pins and triangular blocks. The principle of use is to drill holes on the formwork frame, pass the T-pin through the two formwork holes to be spliced, and then drive the triangular block into the bolt to tighten. This formwork clamp has the disadvantages of complex installation and laborious demoulding. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a spiral clamp for splicing building templates, which has the advantages of quick installation and labor-saving demoulding.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a spiral clamp for splicing building templates, comprising a U-shaped clamp, a movable rod and a movable clamping plate;

[0005] The U-shaped clip comprises a first side wall, a second side wall and a third side wall connected in sequence, the first side wall and the third side wall are respectively perpendicular to the second side wall and are both located on the same side of the second side wall, the first side wall is provided with a through hole, the central axis of the through hole is perpendicular to the third side wall; the end surface of the through hole located inside the U-shaped clip is provided with a spiral surface, the spiral surface comprises two inclined portions symmetrically distributed on the end surface with the central axis of the through hole as the central symmetry axis;

[0006] The movable rod comprises a connecting rod, and two ears are symmetrically distributed with the central axis of the connecting rod as the symmetry axis on the outer surface of the side wall of the connecting rod, and a connecting column is provided on the end surface of the connecting rod close to the first side wall;

[0007] The movable clamp is arranged inside the U-shaped clamp and close to the first side wall. The movable clamp is provided with a mounting hole along the extension direction of the central axis of the through hole. The end surfaces of the two ears close to the first side wall are respectively in contact with the corresponding inclined parts. The connecting column of the connecting rod is passed through the mounting hole on the movable clamp and the movable clamp is rotatably connected to the connecting rod.

[0008] The beneficial effects of the present invention are as follows: the spiral clamp for building formwork splicing provided by the present invention, after assembly, the movable rod is axially retreated along the central axis of the through hole, the U-shaped clamp is inserted into two building formwork frames, the movable rod is axially pushed along the central axis of the through hole, and then the movable rod is spirally pushed, the end surfaces of the two ears close to the first side wall are in contact with the corresponding inclined parts, so that the two ears are symmetrically and spirally pushed in a balanced manner on the spiral surface, thereby generating sufficient clamping force for the two building formwork frames located between the movable splint and the third side wall of the U-shaped clamp, clamping the frames of the two building formworks, and realizing complete splicing of the building formworks. Therefore, the spiral clamp for building formwork splicing provided by the present invention has the advantages of quick installation and labor-saving demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a spiral clamp for splicing building templates from one perspective of the present invention;

[0010] Figure 2 It is a structural schematic diagram of another perspective of the spiral clamp for splicing building formwork of the present invention;

[0011] Figure 3 for Figure 1 The main view;

[0012] Figure 4 for Figure 1 Exploded diagram of

[0013] Figure 5 for Figure 2 Exploded diagram of

[0014] Figure 6 for Figure 4 Left side view;

[0015] Figure 7 for Figure 4 The main view;

[0016] Figure 8 for Figure 4 Right side view;

[0017] Fig. 9 It is a structural schematic diagram of a first embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0018] Fig.10 It is a front view of a first embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0019] Fig.11 A top view of a first embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0020] Fig.12 It is a structural schematic diagram of a second embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0021] Fig.13 A front view of a second embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0022] Fig.14 A top view of a second embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0023] Fig.15 It is a structural schematic diagram of a third embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0024] Fig.16 A front view of a third embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0025] Fig.17 A top view of a third embodiment of the inclined portion of the screw clamp for splicing building formwork of the present invention;

[0026] Description of labels:

[0027] 1. U-shaped clamp;

[0028] 11. first side wall; 111. through hole; 112. spiral surface; 1121. inclined portion; 113. clearance groove;

[0029] 12. a second side wall;

[0030] 13. third side wall; 131. first chamfer;

[0031] 14. The first limiting groove;

[0032] 15. Second limiting groove;

[0033] 2. Movable rod;

[0034] 21, connecting rod; 211, ear; 212, connecting column; 2121, annular groove;

[0035] 22. Rotating arm;

[0036] 3. Movable splint; 31. Protrusion; 32. Mounting hole; 33. Latch; 34. Second chamfer. DETAILED DESCRIPTION

[0037] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0038] Please refer to Figure 1-17 , the present invention provides a spiral clamp for splicing building templates, including a U-shaped clamp, a movable rod and a movable clamping plate;

[0039] The U-shaped clip comprises a first side wall, a second side wall and a third side wall connected in sequence, the first side wall and the third side wall are respectively perpendicular to the second side wall and are both located on the same side of the second side wall, the first side wall is provided with a through hole, the central axis of the through hole is perpendicular to the third side wall; the end surface of the through hole located inside the U-shaped clip is provided with a spiral surface, the spiral surface comprises two inclined portions symmetrically distributed on the end surface with the central axis of the through hole as the central symmetry axis;

[0040] The movable rod comprises a connecting rod, and two ears are symmetrically distributed with the central axis of the connecting rod as the symmetry axis on the outer surface of the side wall of the connecting rod, and a connecting column is provided on the end surface of the connecting rod close to the first side wall;

[0041] The movable clamp is arranged inside the U-shaped clamp and close to the first side wall. The movable clamp is provided with a mounting hole along the extension direction of the central axis of the through hole. The end surfaces of the two ears close to the first side wall are respectively in contact with the corresponding inclined parts. The connecting column of the connecting rod is passed through the mounting hole on the movable clamp and the movable clamp is rotatably connected to the connecting rod.

[0042] From the above description, it can be seen that the beneficial effects of the present invention are: the spiral clamp for building formwork splicing provided by the present invention, after assembly is completed, the movable rod is axially retreated along the central axis of the through hole, the U-shaped clamp is inserted into two building formwork frames, and the movable rod is axially pushed along the central axis of the through hole, and then the movable rod is spirally pushed, and the end surfaces of the two ears close to the first side wall are in contact with the corresponding inclined portions, so that the two ears are symmetrically and balancedly spirally pushed on the spiral surface, thereby generating sufficient clamping force for the two building formwork frames located between the movable splint and the third side wall of the U-shaped clamp, clamping the frames of the two building formworks, and realizing complete splicing of the building formworks. Therefore, the spiral clamp for building formwork splicing provided by the present invention has the advantages of quick installation and labor-saving demoulding.

[0043] Furthermore, the end surfaces of the two ears close to the first side wall are not flush, and the end surfaces of the two ears away from the first side wall are flush. A protrusion is provided on the outer side surface of the movable splint facing the first side wall, and the protrusion is located on the rotating circumferential surface of the ear to limit the spiral angle of the connecting rod.

[0044] From the above description, it can be seen that by setting the protrusion and situating it on the rotating circumferential surface of the ear, the connecting rod drives the ear to move on its rotating circumferential surface during the spiral process. Therefore, the size of the protrusion can be reasonably set to cooperate with the ear to achieve the limitation of the spiral angle of the connecting rod.

[0045] Further, the distance from the end surface of one of the two ears close to the rotating arm to the outer side surface of the movable clamp close to the first side wall is a first distance, the length of the one ear in the extension direction of the central axis of the connecting rod is a second distance, the distance from the surface where the protrusion of the movable clamp protrudes is a third distance, and the first distance is less than the sum of the second distance and the third distance;

[0046] The distance from the end face of the other ear of the two ears close to the rotating arm to the outer side face of the movable splint close to the first side wall is the fourth distance, the length of the other ear in the extension direction of the central axis of the connecting rod is the fifth distance, and the distance from the surface where the protrusion of the movable splint is protruding is the sixth distance, and the fourth distance is greater than the sum of the fifth distance and the sixth distance.

[0047] From the above description, it can be seen that the first distance is smaller than the sum of the second distance and the third distance, and the fourth distance is larger than the sum of the fifth distance and the sixth distance. Through the above-mentioned specific dimension design, it is ensured that when the connecting rod rotates to a certain angle in one direction, the protrusion will contact with one ear, thereby limiting the connecting rod from continuing to rotate in the one direction, avoiding excessive rotation and damaging product performance, thereby ensuring the reliability of product application.

[0048] Furthermore, the movable rod also includes a rotating arm fixedly connected to an end of the connecting rod away from the first side wall, and the rotating arm is perpendicular to the connecting rod.

[0049] From the above description, it can be seen that the rotating arm is fixedly connected to the end of the connecting rod away from the first side wall and is perpendicular to the connecting rod. The movable rod can be driven to rotate by swinging the rotating arm, that is, the original spiral force is replaced by the swinging force, which saves effort. At the same time, the distance between the connecting rod and the building formwork is small, that is, the operating space is small, which is bound to be unfavorable for manual rotation of the connecting rod. Even if it is equipped with a motor or other driving equipment, there are problems of small installation space and complex installation. Therefore, this scheme adopts the method of adding a rotating arm. Since the rotation angle range of the connecting rod is limited by the protrusion (usually not more than 180°), the length requirement of the rotating arm is not limited, and the length of the rotating arm can be conveniently set according to manual action.

[0050] Furthermore, a strip groove is provided on the inner surface of the second side wall along the extension direction of the central axis of the through hole; a latch matched with the strip groove is provided on the outer surface of the movable splint facing the second side wall, the latch is inserted into the strip groove and can move along the extension direction of the strip groove.

[0051] From the above description, it can be seen that by adapting the pin to the strip groove, the movable splint will not deflect with the connecting rod during the rotation of the connecting rod, but will only translate in the axial direction of the connecting rod, so that the movable splint can better form a position for clamping the building formwork with the third side wall.

[0052] Furthermore, two oppositely arranged paving grooves are provided on the inner surface of the side wall of the through hole, the extending direction of the paving grooves is parallel to the central axis of the through hole, and the ears are adapted to the paving grooves.

[0053] It can be seen from the above description that, through the design in which the ear portion is adapted to the clearance groove, the ear portion can pass through the clearance groove and contact the inclined portion, thereby enabling the movable rod to be disassembled and assembled.

[0054] Furthermore, a first limiting groove is provided on the inner side of the connection between the third side wall and the second side wall; and a second limiting groove is provided on the outer side of the movable clamping plate facing the second side wall and is arranged opposite to the first limiting groove.

[0055] From the above description, it can be seen that the first limiting groove and the second limiting groove are arranged relative to each other to form a recessed opening. After the spiral clamp clamps the building template frame, the building template frame is clamped in the recessed opening, so that the building template is not easy to fall off. At the same time, with the cooperation of the above-mentioned pin and the strip groove, even if the position of the movable splint changes, the first limiting groove and the second limiting groove always maintain a relative state.

[0056] Furthermore, the connecting column passes through the mounting hole on the movable clamping plate, and an annular groove is provided on the protruding part of the connecting column, and a retaining spring is sleeved on the annular groove.

[0057] From the above description, it can be seen that when the connecting column and the movable clamp are assembled together, the retaining spring is sleeved on the annular groove so that the diameter of the position where the retaining spring is sleeved is larger than the aperture of the mounting hole on the movable clamp, thereby limiting the axial movement of the movable clamp on the connecting column.

[0058] Furthermore, the third side wall is provided with a first chamfer at the opening of the U-shaped clip, and the outer side surface of the movable clamp facing away from the second side wall is provided with a second chamfer arranged opposite to the first chamfer.

[0059] It can be seen from the above description that by setting the first chamfer and the second chamfer, a guiding function is provided, and the opening of the spiral clamp can be inserted into the building formwork frame to be spliced ​​without precise alignment, so that assembly is quick.

[0060] Furthermore, the distance between a side surface of the movable clamping plate away from the first side wall and the third side wall is 5 mm to 200 mm.

[0061] Please refer to Figure 1-17 , Embodiment 1 of the present invention is:

[0062] The present invention provides a spiral clamp for splicing building templates, comprising a U-shaped clamp 1, a movable rod 2 and a movable clamp plate 3;

[0063] The U-shaped clip 1 comprises a first side wall 11, a second side wall 12 and a third side wall 13 which are connected in sequence. The first side wall 11, the second side wall 12 and the third side wall 13 are integrally formed. The first side wall 11 and the third side wall 13 are respectively perpendicular to the second side wall 12 and are both located on the same side of the second side wall 12. A through hole 111 is provided on the first side wall 11. The through hole 111 is specifically located at the central position of the first side wall 11. The central axis of the through hole 11 is perpendicular to the third side wall 13. A spiral surface 112 is provided on the end surface of the through hole 11 located inside the U-shaped clip. The spiral surface 112 comprises two inclined portions 1121 which are symmetrically distributed on the end surface with the central axis of the through hole 111 as the central symmetry axis. Figure 9-11 As shown, the inclined portion 1121 is an integrally formed and continuous inclined surface on the inner wall of the through hole, wherein the inclined surface is a plane inclined with respect to a plane perpendicular to the central axis of the through hole, and a virtual circle is established with a point on the central axis of the through hole as the center of the circle, and the central angle corresponding to the inclined surface accounts for 4 / 9 of the virtual circle, that is, the central angle corresponding to the inclined surface is 160°.

[0064] Of course, the inclined portion also includes two inclined surfaces with different inclinations and connected to each other, such as Figure 12-14 As shown in the figure, the first slope is steeper and the second is gentler. Figure 15-17 As shown, another structure of the inclined portion is provided, specifically, an inclined surface for axial propulsion is formed on the inner side wall of the through hole along the axial direction, and the entire end surface of the through hole is not used as the inclined portion. At the same time, the spiral surface can also be designed as a single spiral surface, that is, an inclined portion, which can be a continuous flat inclined surface, or two inclined surfaces with different inclinations and connected, or even multiple inclined surfaces (generally not more than 4), and the rotatable range is 0-360°.

[0065] Two oppositely arranged clearance grooves 113 are provided on the inner surface of the side wall of the through hole 11, and the extending direction of the clearance grooves 113 is parallel to the central axis of the through hole 111. The ear 211 is adapted to the clearance grooves 113, wherein the shape and size of the clearance grooves are adapted to the ear, and the two clearance grooves are correspondingly arranged at the connection of the two inclined parts, and when the ear passes through the clearance grooves and enters the interior of the U-shaped clip, it is located at the end of the inclined part closest to the first side wall. Through the design of the ear and the clearance groove being adapted to each other, the ear can pass through the clearance grooves and contact the inclined part, so that the movable rod can be disassembled and assembled.

[0066] The movable rod 2 includes a connecting rod 21, and two ears 211 are symmetrically distributed with the central axis of the connecting rod as the symmetry axis on the outer surface of the side wall of the connecting rod 21, and a connecting column 212 is provided on the end surface of the connecting rod 21 close to the first side wall; the connecting column 212 is cylindrical, and the movable rod 2 also includes a rotating arm 22 fixedly connected to the end of the connecting rod away from the first side wall, and the rotating arm 22 is perpendicular to the connecting rod 21 and is L-shaped. In order to achieve the purpose of labor saving, the length of the rotating arm is greater than the length of the connecting rod during design. Since the rotating arm fixedly connected to the end of the connecting rod away from the first side wall is perpendicular to the connecting rod, it is possible to achieve the rotation of the movable rod by swinging the rotating arm, that is, to replace the original spiral force with a swinging force, which plays a labor saving role, and since the rotation angle range of the connecting rod is limited by the protruding portion (usually not more than 180°, in this solution, it is set to not more than 160°), the length requirement of the rotating arm is not limited, and the length of the rotating arm can be conveniently set according to manual action. In addition, a square shaft or a hexagonal shaft may be fixedly connected to one end of the connecting rod away from the first side wall.

[0067] The end surfaces of the two ears 211 close to the first side wall are not flush, specifically 5 mm apart, and the end surfaces of the two ears 211 away from the first side wall are flush, and the outer surface of the movable clamp 3 facing the first side wall is provided with a protrusion 31, and the protrusion 31 is located on the rotating circumferential surface of the ear to limit the spiral angle of the connecting rod. In this solution, the spiral angle is set to be no greater than 160°. Specifically, the distance from the end face of one of the two ears close to the rotating arm to the outer side face of the movable splint close to the first side wall is the first distance, the length of the one ear in the extension direction of the central axis of the connecting rod is the second distance, the distance from the surface where the protrusion of the movable splint protrudes is the third distance, and the first distance is less than the sum of the second distance and the third distance; the distance from the end face of the other ear close to the rotating arm to the outer side face of the movable splint close to the first side wall is the fourth distance, the length of the other ear in the extension direction of the central axis of the connecting rod is the fifth distance, and the distance from the surface where the protrusion of the movable splint protrudes is the sixth distance, and the fourth distance is greater than the sum of the fifth distance and the sixth distance. Through the above-mentioned specific size design, it is ensured that when the connecting rod rotates to a certain angle in one direction, the protrusion will contact the one ear, which plays a role in limiting the connecting rod from continuing to rotate in the one direction, avoiding excessive rotation and damaging product performance, thereby ensuring the reliability of product application.

[0068] The movable splint 3 is arranged inside the U-shaped clamp 1 and close to the first side wall 11. The movable splint 3 is provided with a mounting hole 32 extending along the central axis of the through hole 111. The end surfaces of the two ears 211 close to the first side wall are respectively in contact with the corresponding inclined portions 1121. The connecting column 212 of the connecting rod is inserted into the mounting hole 32 on the movable splint and the movable splint 3 is rotatably connected to the connecting rod 21. A bearing is embedded inside the mounting hole, and the bearing is sleeved on the connecting column to realize the rotatable connection between the movable splint and the connecting rod. The spacing between the side of the movable splint away from the first side wall and the third side wall is 5mm to 200mm.

[0069] In this embodiment, a strip groove is provided on the inner surface of the second side wall 12 along the extension direction of the central axis of the through hole 111; a latch 33 matching the strip groove is provided on the outer surface of the movable clamping plate 3 facing the second side wall, and the latch 33 is inserted into the strip groove and can move along the extension direction of the strip groove. By matching the latch with the strip groove, the movable clamping plate will not deflect with the connecting rod during the rotation of the connecting rod, but only translate in the axial direction of the connecting rod, so that the movable clamping plate can better form a part for clamping the building template with the third side wall.

[0070] In this embodiment, a first limiting groove 14 is provided on the inner side of the connection between the third side wall 13 and the second side wall 12; and a second limiting groove 15 is provided on the outer side of the movable clamping plate 3 facing the second side wall, which is arranged opposite to the first limiting groove 14. That is to say, the first limiting groove and the second limiting groove are arranged opposite to each other to form a recessed opening. After the spiral clamp clamps the frame of the building template, the frame of the building template is clamped in the recessed opening, so that the building template is not easy to fall off. At the same time, under the cooperation of the above-mentioned latch and the strip groove, even if the position of the movable clamping plate changes, the first limiting groove and the second limiting groove always maintain a relative state. Among them, the second limiting groove is formed by the outer side surface (inclined surface) of the movable clamping plate facing the second side wall and the inner side surface of the second side wall.

[0071] In this embodiment, the connecting column 212 passes through the mounting hole 32 on the movable clamping plate, and an annular groove 2121 is provided on the protruding portion of the connecting column 212, and a retaining spring is sleeved on the annular groove 2121. When the connecting column and the movable clamping plate are assembled together, the retaining spring is sleeved on the annular groove, so that the diameter of the position where the retaining spring is sleeved is larger than the hole diameter of the mounting hole on the movable clamping plate, thereby limiting the movement of the movable clamping plate in the axial direction of the connecting column.

[0072] In this embodiment, the third side wall 13 is provided with a first chamfer 131 at the opening of the U-shaped clamp, and the outer side surface of the movable clamping plate 3 facing away from the second side wall is provided with a second chamfer 34 arranged opposite to the first chamfer 131. The angles of the first chamfer and the second chamfer are equal, and are both 30°-60°, preferably 45°; by providing the first chamfer and the second chamfer, a guiding effect is provided, and the opening of the screw clamp can be inserted into the building template frame to be spliced ​​without precise alignment, so that assembly is fast.

[0073] Through actual measurement, it is found that the traditional through-pin splicing cannot eliminate the influence of the accumulated tolerance phenomenon during installation and the tolerance phenomenon of the punching spacing of the mold frame, and the influence of the phenomenon that a small amount of concrete is inevitably left on the mold frame due to the repeated use of the template, making it difficult to knock in some T-pins, resulting in vacancies in the template installation pins, affecting the project quality and construction safety, and the average installation time is more than 30 seconds / piece; while the spiral clamp for building template splicing provided by the present invention has no effect on the above tolerance phenomenon. The spiral clamp can be clamped at any position of the mold frame to ensure the project quality and construction safety, and the average installation time is less than 10 seconds / piece, which is fast and efficient. In addition, the clamping rigidity of the traditional through-pin splicing has a small force area, less than 500 square millimeters / piece, and the maximum clamping force is less than 100 kilograms / piece; while the clamping rigidity of the spiral clamp for building template splicing provided by the present invention is large, greater than 1500 square millimeters / piece, and the maximum clamping force is greater than 500 kilograms / piece. The invention provides a spiral clamp for building template splicing, the clamping range of which is between 5 mm and 200 mm.

[0074] In summary, the present invention provides a spiral clamp for splicing building formwork. After assembly, the movable rod is axially retreated along the central axis of the through hole, the U-shaped clamp is inserted into two building formwork frames, and the movable rod is axially pushed along the central axis of the through hole, and then the movable rod is spirally pushed. The end surfaces of the two ears close to the first side wall are in contact with the corresponding inclined portions, so that the two ears are symmetrically and spirally pushed in a balanced manner on the spiral surface, thereby generating sufficient clamping force for the two building formwork frames located between the movable splint and the third side wall of the U-shaped clamp, clamping the frames of the two building formworks, and realizing complete splicing of the building formwork. Therefore, the spiral clamp for splicing building formwork provided by the present invention has the advantages of quick installation and labor-saving demoulding.

[0075] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A screw clamp for building formwork splicing, characterized in that: It includes a U-shaped clamp, a movable rod and a movable splint; The U-shaped clip comprises a first side wall, a second side wall and a third side wall connected in sequence, the first side wall and the third side wall are respectively perpendicular to the second side wall and are both located on the same side of the second side wall, the first side wall is provided with a through hole, the central axis of the through hole is perpendicular to the third side wall; the end surface of the through hole located inside the U-shaped clip is provided with a spiral surface, the spiral surface comprises two inclined portions symmetrically distributed on the end surface with the central axis of the through hole as the central symmetry axis; The movable rod comprises a connecting rod, and two ears are symmetrically distributed with the central axis of the connecting rod as the symmetry axis on the outer surface of the side wall of the connecting rod, and a connecting column is provided on the end surface of the connecting rod close to the first side wall; The movable clamp is arranged inside the U-shaped clamp and close to the first side wall, the movable clamp is provided with a mounting hole along the extension direction of the central axis of the through hole, the end surfaces of the two ears close to the first side wall are respectively in contact with the corresponding inclined parts, the connecting column of the connecting rod is passed through the mounting hole on the movable clamp, and the movable clamp is rotatably connected to the connecting rod; The third side wall is provided with a first chamfer at the opening of the U-shaped clamp, and the outer side surface of the movable clamping plate facing away from the second side wall is provided with a second chamfer arranged opposite to the first chamfer; The distance between the side surface of the movable clamping plate away from the first side wall and the third side wall is 5 mm to 200 mm.

2. The screw clamp for building formwork splicing according to claim 1, characterized in that: The end surfaces of the two ears close to the first side wall are not flush, and the end surfaces of the two ears away from the first side wall are flush. A protrusion is provided on the outer side surface of the movable clamp facing the first side wall, and the protrusion is located on the rotating circumferential surface of the ear to limit the spiral angle of the connecting rod.

3. The screw clamp for building formwork splicing according to claim 2, characterized in that: The distance between the end surface of one of the two ears close to the rotating arm and the outer side surface of the movable clamp close to the first side wall is a first distance, the length of the one ear in the extension direction of the central axis of the connecting rod is a second distance, and the distance between the protrusion of the movable clamp and the surface where the protrusion is protruding is a third distance, and the first distance is less than the sum of the second distance and the third distance; The distance from the end face of the other ear of the two ears close to the rotating arm to the outer side face of the movable splint close to the first side wall is the fourth distance, the length of the other ear in the extension direction of the central axis of the connecting rod is the fifth distance, and the distance from the surface where the protrusion of the movable splint is protruding is the sixth distance, and the fourth distance is greater than the sum of the fifth distance and the sixth distance.

4. The screw clamp for building formwork splicing according to claim 1, characterized in that: The movable rod also includes a rotating arm fixedly connected to an end of the connecting rod away from the first side wall, and the rotating arm is perpendicular to the connecting rod.

5. The screw clamp for building formwork splicing according to claim 1, characterized in that: A strip groove is provided on the inner surface of the second side wall along the extension direction of the central axis of the through hole; a latch matched with the strip groove is provided on the outer surface of the movable splint facing the second side wall, the latch is inserted into the strip groove and can move along the extension direction of the strip groove.

6. The screw clamp for building formwork splicing according to claim 1, characterized in that: Two oppositely arranged paving grooves are provided on the inner surface of the side wall of the through hole, the extending direction of the paving grooves is parallel to the central axis of the through hole, and the ear parts are adapted to the paving grooves.

7. The screw clamp for building formwork splicing according to claim 1, characterized in that: A first limiting groove is provided on the inner side of the connection between the third side wall and the second side wall; and a second limiting groove is provided on the outer side of the movable clamping plate facing the second side wall and is arranged opposite to the first limiting groove.

8. The screw clamp for building formwork splicing according to claim 1, characterized in that: The connecting column passes through the mounting hole on the movable clamping plate, and an annular groove is arranged on the protruding part of the connecting column, and a clamping spring is sleeved on the annular groove.

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