Rebar cross tie cold press

Abstract

This utility model relates to the construction field, particularly to rebar connection technology, specifically a cold press for longitudinal and transverse rebar connection. It includes a hydraulic cylinder with an axially movable hydraulic shaft inside. The upper half of the hydraulic cylinder is open, and a sliding cold press block is mounted on the hydraulic shaft within the opening. An outer cylinder is located outside the hydraulic cylinder, with an opening corresponding to the hydraulic cylinder. A fixed cold press block is mounted on the outer side of the other end of the outer cylinder, positioned vertically opposite the sliding cold press block, forming a working space for accommodating the rebar connection sleeve. Both the sliding and fixed cold press blocks have U-shaped grooves for rebar insertion on their opposite sides. Four mounting screw holes are symmetrically arranged at the four corners of the outer cylinder, and a lifting ring is welded to the top of one end of the outer cylinder. This utility model is simple and efficient to operate, achieving reliable rebar connection through cold extrusion. The dedicated mounting screw holes allow for the connection of a CNC operator, enabling the equipment to perform cold extrusion operations both longitudinally and laterally.

Description

Technical Field

[0001] This utility model relates to the field of construction, and in particular to the technology of steel bar connection, specifically a cold press for longitudinal and transverse steel bar connection. Background Technology

[0002] Reinforcing steel bars are specialized steel materials used in reinforced concrete and prestressed reinforced concrete engineering. They are primarily circular in cross-section, but square bars with rounded corners can also be used. Common types include plain round bars, ribbed bars, and twisted bars. In concrete structures, reinforcing steel bars mainly bear tensile stress. Deformed reinforcing bars, through the interlocking effect of their surface ribs, can form a stronger bond with the concrete, thus more efficiently transferring and bearing external forces. This material is widely used in various building structures, especially suitable for large-scale, key projects, lightweight thin-walled structures, and high-rise buildings where high structural strength is required.

[0003] Rebar splicing is an indispensable and crucial process in reinforced concrete construction. Traditional splicing methods often use wire binding or welding to fix the rebars together, but these methods have significant drawbacks: insufficient mechanical strength of the joints, making them prone to breakage during actual use, which can lead to safety accidents. Furthermore, these methods also suffer from low efficiency, inconvenience in operation, and limited applicability. Summary of the Invention

[0004] In view of the above-mentioned problems, the purpose of this utility model is to provide a cold press for connecting longitudinal and transverse reinforcing bars that is simple in structure, versatile in application, and can effectively connect reinforcing bars. It overcomes the above-mentioned shortcomings of the prior art.

[0005] The purpose of this utility model is achieved as follows: It includes a hydraulic cylinder, inside which is an axially movable hydraulic shaft. The upper half of the hydraulic cylinder is open, and a sliding cold-pressing block is installed on the hydraulic shaft within the opening. An outer cylinder is provided outside the hydraulic cylinder, with an opening corresponding to the hydraulic cylinder. A fixed cold-pressing block is installed on the outer side of the other end of the outer cylinder, positioned vertically opposite to the sliding cold-pressing block, forming a working space for accommodating a rebar connecting sleeve. Both the sliding and fixed cold-pressing blocks have U-shaped guide holes for rebar insertion in the middle of their opposing sides. Four mounting screw holes are symmetrically arranged at the four corners of the outer cylinder, and a lifting ring is welded to the top of one end of the outer cylinder.

[0006] The sliding cold pressing block is equipped with a combinable mold assembly, which includes a fixed radius mold and a movable radius mold. The fixed radius mold is fixed on the sliding cold pressing block, and the movable radius mold is fixed on a movable fixed module. The movable fixed module is provided with a handle. The fixed cold pressing block is equipped with a positioning pressure cylinder assembly, which includes a movable positioning radius pressure cylinder and a fixed positioning radius pressure cylinder. The fixed positioning radius pressure cylinder is fixed on the fixed cold pressing block, and the movable positioning radius pressure cylinder is fixed on a movable pressure cylinder fixing block. The movable pressure cylinder fixing block is provided with a handle.

[0007] The diameter of the pressure cylinder assembly is smaller than the diameter of the steel bar connecting sleeve, and the inner hole of the mold assembly has a conical structure.

[0008] The two ends of the steel bar connecting sleeve are chamfered.

[0009] The chamfer at both ends of the steel bar connecting sleeve is 20 degrees.

[0010] Both the sliding cold pressing block and the fixed cold pressing block are provided with limiting grooves inside.

[0011] Because this utility model adopts the above-mentioned structure, it has the following advantages compared with the prior art: simple and efficient operation: simply insert the steel bar into the sleeve, and high-quality sleeve steel bar firm connection can be completed through cold extrusion, which can improve the efficiency of tools and machinery, reduce the risk of manual operation in construction, and ensure process safety and high efficiency; compact structure and wide applicability: the sliding cold pressing block is small in size, which is particularly suitable for environments with dense steel bar arrangement or the overall hoisting of steel cages and the needs of steel cage and equipment engineering steel bar connection projects, thus expanding the application scenarios; multi-directional operation can be realized: by setting a special installation screw hole, a matching CNC operating basket can be connected, so that the equipment can perform cold extrusion operations both longitudinally and laterally, which improves construction flexibility, reduces manual labor intensity and operational risks, realizes semi-automatic control, and improves the construction safety guarantee factor. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the longitudinal placement structure of this utility model; Figure 2 This is a schematic diagram of the horizontally placed structure of this utility model; Figure 3 This is the front view of this utility model; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the sliding cold pressing block structure of this utility model; Figure 6This is a schematic diagram of the transverse steel bar connection structure of this utility model; Figure 7 This is a schematic diagram of the longitudinal steel bar connection structure of this utility model; Figure 8 This is a schematic diagram of the fixed cold pressing block structure of this utility model; Figure 9 This is a schematic diagram of the fixed positioning radius mold structure of this utility model; Figure 10 This is a partial perspective view of the fixed cold pressing block of this utility model; Figure 11 This is a partial perspective view of the sliding cold pressing block of this utility model.

[0014] In the diagram: 1. Hydraulic cylinder barrel; 2. Hydraulic shaft; 3. Handle; 4. Sliding cold pressing block; 5. Rib joint; 6. Movable pressure cylinder fixing block; 7. Rebar connecting sleeve; 8. Fixed cold pressing block; 9. Limiting groove; 10. Movable positioning radius pressure cylinder; 11. Fixed positioning radius pressure cylinder; 12. Movable fixing module; 13. Radius movable mold block; 14. Radius fixed mold block; 15. Outer cylinder; 16. Mounting screw hole; 17. Lifting ring; 18. Rebar. Detailed Implementation

[0015] This utility model discloses a cold pressing machine for longitudinal and transverse rebar connection, comprising a hydraulic cylinder 1, inside which is an axially movable hydraulic shaft 2. The upper part of the hydraulic cylinder 1 is partially open, and a sliding cold pressing block 4 is installed on the hydraulic shaft 2 within the opening. This structure makes the sliding cold pressing block 4 the direct execution terminal of the hydraulic shaft 2, allowing the sliding cold pressing block 4 to move within the opening of the hydraulic cylinder 1. An outer cylinder 15 is provided on the outside of the hydraulic cylinder 1, with an opening corresponding to the hydraulic cylinder 1. The outer cylinder is fixed to the outside of the hydraulic cylinder 1 by bolts or welding. A fixed cold pressing block 8 is installed on the outer side of the other end of the outer cylinder 15, which is arranged vertically opposite to the sliding cold pressing block 4, forming a working space for accommodating the rebar connecting sleeve 7. A U-shaped longitudinal reinforcement opening 5 for rebar to pass through is provided in the middle of the side of the sliding cold pressing block 4 and the fixed cold pressing block 8 facing each other. The hydraulic cylinder 1 is equipped with a special outer cylinder 15 on its outer side. The outer cylinder 15 has four mounting screw holes 16 symmetrically arranged at its four corners. A lifting ring 17 is provided at the top of one end of the outer cylinder 15 for lifting the steel bar longitudinal and transverse connection cold press.

[0016] The four mounting screw holes 16 symmetrically arranged at the four corners of the outer cylinder 15 can be connected to a matching CNC automatic operator by bolts, so that the cold press for longitudinal and transverse connection of steel bars can perform cold extrusion operations both longitudinally and transversely, which improves construction flexibility, reduces manual labor intensity and operational risks, realizes semi-automatic operation, and improves the construction safety guarantee factor.

[0017] The sliding cold pressing block 4 is equipped with a combinable mold assembly, which includes a radius-fixed mold 14 and a radius-movable mold 13. The radius-fixed mold 14 is fixed to the sliding cold pressing block 4, and the radius-movable mold 13 is fixed to the movable fixed module 12. The movable fixed module 12 is provided with a handle 3 for easy loading and unloading. A limiting groove 9 is machined inside the outer side of the sliding cold pressing block 4, which is used to assemble the detachable movable fixed module 12. The movable fixed module 12 is equipped with the radius-movable mold 13, which, when joined with half of the mold on the radius-fixed mold 14, forms a complete extrusion mold, together constituting a smooth-walled, complete cylindrical mold (assembly). The inner diameter of the mold (assembly) is smaller than the outer diameter of the rebar connecting sleeve 7 to achieve the extrusion effect. A U-shaped guide slot 5 is provided in the middle of the side of the sliding cold pressing block 4 facing the workpiece to guide the horizontal insertion of the rebar. At the other end of the device, a fixed cold pressing block 8 is provided, coaxially corresponding to the sliding cold pressing block 4. Its internal structure is a mirror image of the sliding cold pressing block 4, with essentially the same structure. A limiting groove 9 is formed on its upper surface, used to assemble and fix the detachable movable pressure cylinder fixing block 6. A positioning pressure cylinder assembly is installed inside the fixed cold pressing block 8. This assembly includes a movable positioning radius pressure cylinder 10 and a fixed positioning radius pressure cylinder 11. The fixed positioning radius pressure cylinder 11 is fixed to the fixed cold pressing block 8, and the movable positioning radius pressure cylinder 10 is fixed to the movable pressure cylinder fixing block 6. Thus, the movable positioning radius pressure cylinder 10 mounted on the movable pressure cylinder fixing block 6 and the half-pressure cylinder of the fixed positioning radius pressure cylinder 11, when joined together, form a complete pressure cylinder (assembly). This pressure cylinder (assembly) stabilizes and compresses the rebar connecting sleeve 7, causing the rebar connecting sleeve 7 to gradually contract under pressure during compression. A handle 3 is provided on the movable pressure cylinder fixing block 6 for easy removal and placement. A precise gap is maintained between the sliding cold pressing block 4 and the fixed cold pressing block 8 for vertical placement of the rebar connecting sleeve 7. The rebar connecting sleeve 7 has 20-degree chamfers at both ends to facilitate the introduction of extrusion.

[0018] A key improvement of this invention lies in the fact that four mounting screw holes 16 are symmetrically arranged at the four corners of the outer cylinder 15 of the cold press. These mounting screw holes 16 are high-strength alloy steel threaded holes that have undergone heat treatment, and high-strength nuts can be directly fixed to the outer cylinder 15 of the cold press body. Their axial direction is perpendicular to the main axis of the hydraulic cylinder 1. They are not simply lifting points, but rather standard mechanical interfaces for quick and rigid connection with external CNC operators or multi-functional frames. Through this interface, the flexibility of the equipment operation is realized. When the equipment is fixed to the operator in a conventional posture through the mounting screw holes 16, the orientation of the rib joint 5 is adjusted for standard vertical rebar connection. When the entire equipment is rotated 90 degrees around its axis and relocked through the mounting screw holes 16, the equipment turns to a horizontal posture, and the rib joint 5 becomes horizontal. This allows the cold press for longitudinal and transverse rebar connection to directly perform in-situ cold extrusion connection of horizontal rebars without changing the original layout of the rebar mesh, completely solving the problem of the need for additional construction space or complex positioning when connecting horizontal rebars in traditional equipment.

[0019] The working principle and operation steps of this utility model are as follows: First, mold assembly: Select the corresponding size of the rebar connecting sleeve 7 according to the specifications of the rebar 18, and vertically place the rebar connecting sleeve 7 into the space between the upper and lower sliding cold pressing block 4 and the fixed cold pressing block 8. Insert the movable fixed module 12 into the limiting groove 9 on the outward side of the sliding cold pressing block 4. The radius movable mold 13 on the movable fixed module 12 is assembled with the radius fixed mold 14 to form a mold (assembly). Insert the movable pressure cylinder fixing block 6 into the limiting groove 9 opened on the upper surface of the fixed cold pressing block 8. The movable positioning radius pressure cylinder 10 on the movable pressure cylinder fixing block 6 is assembled with the fixed positioning radius pressure cylinder 11 to form a complete pressure cylinder (assembly).

[0020] Secondly, the system is in place: At this point, the main body of the cold press has been quickly installed onto the CNC operator's hand that is already in place through the mounting screw holes 16 (this is existing technology and will not be described in detail here), and the corresponding working posture is selected and locked according to the direction (longitudinal / transverse) of the steel bars 18 on site.

[0021] Secondly, intelligent extrusion: The operator starts the hydraulic equipment through the control system of the CNC operator. The hydraulic shaft 2 moves downward precisely under hydraulic drive, pushing the sliding cold pressing block 4 and the mold on it to press down steadily. The mold applies a uniform radial extrusion force to the steel bar connecting sleeve 7, while the pressure cylinder on the fixed cold pressing block 8 provides rigid reaction force and precise guidance to the end of the extrusion stroke.

[0022] Finally, the connection is completed: the metal shell of the rebar connecting sleeve 7 undergoes plastic flow under strong circumferential pressure, tightly wrapping and biting into the transverse ribs of the two rebar sections 18, forming a mechanical connection node that far exceeds the yield strength of the rebar parent material, thus achieving the purpose of connecting the two rebar sections. The extrusion process immediately completes the high-quality and high-efficiency connection technology.

[0023] This utility model's cold pressing machine for longitudinal and transverse rebar connection is easy to operate, safe in process, and highly efficient; it has a compact structure, stable quality, and wide applicability; the sliding cold pressing block 4 is small in size, making it particularly suitable for the overall hoisting of densely arranged rebar grids or rebar cages and for connecting prefabricated engineering rebar 18, thus expanding its application scenarios; in addition, it can achieve multi-directional operation. By setting up dedicated mounting screw holes 16 and matching CNC operators, the equipment can perform cold extrusion operations both longitudinally and laterally, improving construction flexibility, reducing manual labor intensity and operational risks, realizing semi-automatic operation, and improving the construction safety guarantee factor.

[0024] The external dimensions and shape of the cold press for longitudinal and transverse steel bar connections of this utility model can be determined according to actual needs to match specific dimensions and shapes. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cold press for longitudinal and transverse connection of reinforcing bars, characterized in that: The device includes a hydraulic cylinder (1), which has an axially movable hydraulic shaft (2) inside. The upper half of the hydraulic cylinder (1) is open, and a sliding cold pressing block (4) is installed on the hydraulic shaft (2) inside the opening. An outer cylinder (15) is provided on the outside of the hydraulic cylinder (1). An opening corresponding to the hydraulic cylinder (1) is opened on the outer cylinder (15). A fixed cold pressing block (8) is installed on the outer side of the other end of the outer cylinder (15). It is arranged vertically opposite to the sliding cold pressing block (4), and the two form a working space for accommodating the steel bar connecting sleeve (7). The sliding cold pressing block (4) and the fixed cold pressing block (8) are both provided with U-shaped straight bar openings (5) for the steel bar (18) to pass through in the middle of the side facing each other. Four mounting screw holes (16) are symmetrically arranged at the four corners of the outer cylinder (15). A lifting ring (17) is welded to the top of one end of the outer cylinder.

2. The cold press for longitudinal and transverse connection of reinforcing bars according to claim 1, characterized in that: The sliding cold pressing block (4) is equipped with a combinable mold assembly, which includes a radius fixed mold (14) and a radius movable mold (13). The radius fixed mold (14) is fixed on the sliding cold pressing block (4), and the radius movable mold (13) is fixed on the movable fixed module (12). The movable fixed module (12) is provided with a handle (3). The fixed cold pressing block (8) is equipped with a pressure cylinder assembly for positioning, which includes a movable positioning radius pressure cylinder (10) and a fixed positioning radius pressure cylinder (11). The fixed positioning radius pressure cylinder (11) is fixed on the fixed cold pressing block (8), and the movable positioning radius pressure cylinder (10) is fixed on the movable pressure cylinder fixing block (6). The movable pressure cylinder fixing block (6) is provided with a handle (3).

3. The cold press for longitudinal and transverse connection of reinforcing bars according to claim 2, characterized in that: The diameter of the pressure cylinder assembly is smaller than the outer diameter of the steel bar connecting sleeve (7), and the inner hole of the mold assembly is a conical structure.

4. The cold press for longitudinal and transverse connection of reinforcing bars according to claim 1, characterized in that: The two ends of the steel bar connecting sleeve (7) are chamfered.

5. The cold press for longitudinal and transverse connection of reinforcing bars according to claim 1 or 4, characterized in that: The chamfer at both ends of the steel bar connecting sleeve (7) is 20 degrees.

6. The cold press for longitudinal and transverse connection of reinforcing bars according to claim 1 or 2, characterized in that: Both the sliding cold pressing block (4) and the fixed cold pressing block (8) are provided with limiting grooves (9).

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