A bar connection system and its connection method

Abstract

The present invention discloses a rod connection system and a connection method thereof. The connection system includes a sleeve for connecting the rod and a special anvil for extruding the sleeve to realize the consolidation connection between the sleeve and the rod; the connection method adopts a riveting mechanism to drive the special anvil to axially extrude the sleeve to realize the shrinkage riveting connection of the sleeve. The connection system of the present invention utilizes the principle of metal plastic deformation, uses an extrusion installation tool, extrude the sleeve along the axial direction of the sleeve, shrinks the outer diameter of the sleeve, and the sleeve metal flows radially into the gap between the transverse ribs of the steel bar or the sleeve clamps the rod, so that the rods have a certain tensile strength, and the steel bar or the rod and the sleeve form a whole with a certain tensile strength; the extrusion connection method of the sleeve and the steel bar or the rod ensures the consistency and stability of the connection strength of each joint, avoids the joint performance defects caused by human operation, and the connection is more firm and has higher strength; no processing such as roughing, peeling, and thread rolling is required, and the speed is fast and the installation efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting structural rods, and in particular to a rod connecting structure, a special tool and a connecting method thereof. Background Art

[0002] In the construction field, it is often necessary to connect rebars, wires and other rods. Currently, welding is generally used to weld the ends of two adjacent steel bars together. Due to space limitations at the construction site, the welded interfaces are often not strong enough, rusted, or cracked, which affects the connection quality.

[0003] Mechanical connection of steel bars or rods is a new connection process, which is widely used in large steel structures involving reinforced concrete, such as highway bridges, house construction, and nuclear power plants. Common connection methods include cone sleeve axial connection, threaded connection, and grouting sleeve connection. Although the existing cone sleeve axial extrusion has a faster extrusion speed and a lighter extrusion tool, it has disadvantages such as many structural parts, high cost, and complex lock plate processing technology. The most commonly used threaded connection has poor on-site operability, and the joint performance is greatly affected by human operation, and the joint performance is unstable. The grouting sleeve connection has high cost, difficulty in on-site operation, and difficulty in joint installation quality inspection. The existing radial cold extrusion connection has disadvantages such as bulky extrusion tools and slow extrusion speed. Summary of the invention

[0004] The present invention discloses a rod connection system and a connection method thereof in view of the deficiencies of the prior art. The present invention aims to provide a rod connection system and a connection method with good connection strength consistency, good stability, higher strength, convenient operation and high construction efficiency.

[0005] The present invention is achieved through the following technical solutions:

[0006] The rod connection system of the present invention comprises a sleeve for connecting the rod and a special anvil for pressing the sleeve to realize the fixed connection between the sleeve and the rod;

[0007] The sleeve has a symmetrical circular tube structure with two ends for inserting the rod, an outer boss and an inner boss are arranged at the axial center of the circular tube, tapered openings are arranged at the open ends of the two ends of the circular tube, and a deformation transition section is arranged at the rear of the tapered openings at the two ends; wherein the inclination of the tapered opening is 90°≤β≤120°, the inclination of the transition section is 0°≤α≤20°, the length of the tapered opening is 0≤L<L1, and the total length of the transition section is L1≤1 / 4 of the total length of the sleeve;

[0008] The special anvil comprises: two half clamps which can be opened and closed and hingedly connected, two half anvils which can be replaced and respectively embedded and fixed on the inner walls of the two half clamps, and the two half clamps are hinged and closed by inserting a pin into the connecting ear;

[0009] The inner hole formed after the two anvil halves are closed fits tightly with the round tubes at both ends of the sleeve through extrusion, realizing the riveting and consolidation of the sleeve and the rod.

[0010] The ratio of the inner diameter to the outer diameter of the sleeve is 1 / 10 ≤ D3 / D1 ≤ 9 / 10, the diameter D2 of the outer convex platform is D2 ≥ D1, and the diameter D4 of the inner convex platform is 0 ≤ D4 ≤ D3.

[0011] On the outer wall of each of the two half clamps, two ear-shaped connecting ears are arranged on one side along the axial direction, and three ear-shaped connecting ears are arranged on the other side.

[0012] On the outer wall of the two anvil halves of the present invention, multiple groups of stepped ring grooves and protrusions are circumferentially arranged, and the ring grooves and protrusions of each stepped structure are fixedly embedded in a matching manner with the protrusions and ring grooves arranged on the inner wall of the two half clamps.

[0013] The connection method using the above-mentioned rod connection system includes the following steps:

[0014] (1) Determine the sleeve parameters and the sleeve model according to the dimensions of the connecting rods, and determine the matching anvil half model according to the sleeve model;

[0015] (2) Embed and fix the two anvil halves in the two half clamps;

[0016] (3) Insert one connecting rod into the hole at one end of the sleeve, and then insert the other connecting rod into the hole at the other end of the sleeve;

[0017] (4) Move the special anvil close to the connecting piece, open the two half clamps prepared in step (2), and make the connecting rod and the unriveted sleeve be clamped into the special anvil;

[0018] (5) Close the two half clamps and lock the connecting ears of the two half clamps with a pin;

[0019] (6) Set the parameters of the power source, start the switch, and use the riveting mechanism to drive the clamp from both ends and axially extrude the anvil, so that the two special anvils at both ends are extruded until they contact the surface of the outer convex platform of the sleeve, and the sleeve extrusion is completed;

[0020] (7) After the extrusion is completed, reset the parameters of the power source, start the switch, and under the axial acting force of the extrusion mechanism, the two special anvils withdraw along the center of the sleeve until the special anvils completely leave the sleeve, and the sleeve extrusion installation is completed.

[0021] The connection system of the present invention utilizes the principle of metal plastic deformation, uses an extrusion installation tool, extrudes the sleeve along the axial direction of the sleeve, makes the outer diameter of the sleeve shrink, and the sleeve metal flows into the gap between the transverse ribs of the steel bar in the radial direction or the sleeve clamps the rod, so that there is a certain tensile strength between the rods, and the steel bar or rod and the sleeve form an integral body with a certain tensile strength.

[0022] The sleeve structure of the system of the present invention is simple. The extrusion connection method between the sleeve and the steel bar or rod ensures the consistency and stability of the connection strength of each joint, avoids the joint performance defects caused by manual operation, makes the connection more firm and has higher strength. Connecting steel bars does not require secondary processing such as upsetting, peeling, and rolling threads, which is convenient for construction, saves costs, has a fast extrusion connection speed, and high installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional view of the connection structure of the present invention;

[0024] Figure 2 is a schematic cross-sectional structure view of the connection sleeve of the present invention;

[0025] Figure 3 is a schematic view of the connection sleeve size of the present invention;

[0026] Figure 4 is a partial schematic view of the sleeve of the present invention, that is Figure 3 the enlarged view of part B in

[0027] Figure 5 is a schematic view of the special anvil of the present invention;

[0028] Figure 6 is a schematic view of the sleeve and the rod before extrusion consolidation of the present invention;

[0029] Figure 7 is a schematic view of the installation of the special anvil;

[0030] Figure 8 is a schematic view of the closing of the special anvil;

[0031] Figure 9 is a schematic view of the extrusion of the special anvil.

[0032] In the figure, 1 is the rod, 2 is the sleeve, 3 is the special anvil, 31 is the half anvil, 32 is the pin, 33 is the hoop, 34 is the connecting ear, I is the conical opening, II is the deformation transition zone, III is the main deformation zone, IV is the outer convex platform, VI is the inner convex platform, D1 is the outer diameter of the sleeve, D2 is the diameter of the outer convex platform, D3 is the inner diameter of the sleeve, D4 is the diameter of the inner convex platform, L is the length of the conical opening, L1 is the total length of the transition section, α is the inclination angle of the transition section, and β is the conical opening angle. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described below in conjunction with the specific embodiments. The specific embodiments are further explanations of the principles of the present invention and do not limit the present invention in any way. The same or similar technologies to the present invention do not exceed the scope of protection of the present invention.

[0034] As shown in the figure, the rod connection system includes a sleeve 2 for connecting the rod 1 and a special anvil 3 for squeezing the sleeve 2 to realize the consolidation connection between the sleeve 2 and the rod 1;

[0035] The sleeve 2 has a symmetric circular tube structure with both ends for sleeving the rod. An outer boss IV and an inner boss are provided at the axial center of the circular tube. Tapered mouths I are provided at the open ends of both ends of the circular tube, and a deformation transition section area II is provided at the rear of the tapered mouths I at both ends; wherein, the inclination of the tapered mouth is 90°≤β≤120°, the inclination of the transition area is 0°≤α≤20°, the length of the tapered mouth is 0≤L<L1, and the total length of the transition section is L1≤1 / 4 of the total length of the sleeve;

[0036] The special anvil 3 includes: two half clamps 33 that can be opened and closed and are hinged, and two anvil halves 31 that can be replaced and are respectively embedded and fixed on the inner walls of the two half clamps 33. The two half clamps 33 are hinged and closed by inserting a pin 32 through a connecting ear 34;

[0037] The inner hole formed after the two anvil halves 31 are closed is in extrusion fit with the circular tubes at both ends of the sleeve 2 to realize the riveting consolidation between the sleeve 2 and the rod 1.

[0038] The ratio of the inner diameter to the outer diameter of the sleeve is 1 / 10≤D3 / D1≤9 / 10, the diameter of the outer boss is D2≥D1, and the diameter of the inner boss is 0≤D4≤D3.

[0039] On the outer walls of both half clamps 33, two connecting ears 34 are provided on one side along the axial direction, and three connecting ears 34 are provided on the other side.

[0040] On the outer walls of the two anvil halves 31, a plurality of groups of stepped ring grooves and protrusions are provided circumferentially, and the ring grooves and protrusions of each stepped structure are matched and embedded and fixed with the protrusions and ring grooves provided on the inner walls of the two half clamps 33.

[0041] As Figure 2 、 Figure 3 、 Figure 4As shown, the sleeve 2 has a tapered mouth I, which plays a centering, positioning and guiding function in the early stage of cold extrusion, effectively increases the contact area between the tool and the sleeve 2, ensures that the sleeve 2 and the special anvil 3 move relative to each other on the same axis in the early stage of riveting, and causes uniform and stable plastic deformation of the sleeve 2; the rear side of the tapered mouth I is the deformation transition zone II, the main function of the deformation transition section II is to prevent eccentricity caused by excessive extrusion force in the early stage of installation, and a small amount of sleeve 2 metal in the deformation transition zone II is squeezed between the transverse ribs of the steel bar or generates a certain tensile strength between the rods 1; the rear side of the deformation transition zone II is the main Deformation zone III, the main deformation zone III undergoes maximum plastic deformation under the action of the special anvil 3, so that the metal of the sleeve 2 flows into the gap between the transverse ribs of the steel bar or enables the rod 1 to produce high tensile strength, which is also the main stage for providing the rods 1 at both ends with high tensile strength; an external boss IV is arranged in the middle of the sleeve 2 as an extrusion limiting structure, and when the special anvils 3 at both ends contact the external boss IV, the extrusion is completed; the internal boss VI plays a positioning role for the connecting rod 1 or the steel bar, controls the extruded length of the rod 1 or the steel bar inserted into the sleeve 2, and at the same time solves the problem that the sleeve 2 cannot be fixed when installed vertically or inclined.

[0042] The angle of the taper mouth should meet 90°≤β≤120°. The inclination angle of the transition section should meet 0°≤α≤20°. The inner diameter of the sleeve and the outer diameter of the sleeve should meet 1 / 10≤D3 / D1≤9 / 10. The diameter of the outer boss should meet D2≥D1. The diameter of the inner boss should meet 0≤D4≤D3. The length of the taper mouth should meet 0≤L<L1. The total length L1 of the transition section should meet L1≤1 / 4 of the total length of the sleeve.

[0043] The rod connection system is connected by a power source driving an extrusion mechanism and a special anvil 3. The power source and the extrusion mechanism are conventional mechanisms. The present invention does not introduce the riveting system in detail.

[0044] The connection and installation process of the system of the present invention is mainly divided into two processes: press riveting and de-riveting.

[0045] The special anvil 3 for extrusion in contact with the sleeve 2 is a two-half structure that can be opened. The purpose of this design is to facilitate the insertion of the steel bar or rod 1. In the actual construction site, both ends of the steel bar or rod 1 are infinitely long. In order to make the sleeve 2 be extruded along the axial direction of the steel bar or rod, it is necessary to ensure that the extrusion sleeve 2 and the steel bar or rod 1 can be inserted into the center of the extrusion tool, such as Figure 5 The dedicated anvil 3 structure is shown.

[0046] The special anvil 3 is composed of two half hoops 33 , two half anvil halves 31 , and two latches 32 .

[0047] Taking the special anvil 3 at one end of the sliding punch as an example, since the steel bars or rods 1 at both ends are very long at the actual construction site, it is necessary to consider how to conveniently insert the unextruded whole of the steel bars or rods 1 and the connecting sleeve 2 into the extrusion tool.

[0048] As Figure 7 shown, a special anvil 3 is connected together with a pin 32. The two half hoops 33 connected together can rotate relative to each other to form a certain opening. Through the opening, the unextruded whole of the steel bars or rods 1 and the connecting sleeve 2 can be conveniently inserted into the half anvil 31, as Figure 8 shown. Then, rotate the two half hoops 33 to close the opening, and lock the hoop connection ear 34 with another pin 32 so that the steel bars or rods 1 and the unextruded sleeve 2 are integrally wrapped.

[0049] Installation steps:

[0050] (1) Determine the parameters of the sleeve 2 and the model of the sleeve 2 according to the size of the connecting rod 1, and determine the model of the matching half anvil 31 according to the model of the sleeve 2;

[0051] (2) Embed and fix the two half anvils 31 in the two half hoops 33;

[0052] (3) Insert a connecting rod 1 into the hole at one end of the sleeve 2, and then insert another connecting rod 1 into the hole at the other end of the sleeve 2;

[0053] (4) Move the riveting tool close to the workpiece, open the two half hoops 33 prepared in step (2), and insert the connecting rod 1 and the unriveted sleeve 2 into the special anvil 3;

[0054] (5) Close the two half hoops 33 and lock the connection ear 34 of the two half hoops 33 with a pin 32;

[0055] (6) Set the parameters of the power source, start the switch, and use the riveting mechanism to drive the hoops from both ends and extrude the anvil so that the two end anvils are extruded until they contact the outer convex surface of the sleeve 2, and the extrusion of the sleeve 2 is completed;

[0056] (7) After the extrusion is completed, reset the parameters of the power source, start the switch, and under the axial acting force of the extrusion mechanism, the two special anvils 3 withdraw along the center of the sleeve 2 until the special anvil 3 completely leaves the sleeve 2, and the extrusion installation of the sleeve 2 is completed.

Claims

1. A rod connection system, characterized in that: The connecting system includes a sleeve for connecting rod members and a special anvil for squeezing the sleeve to realize the consolidation connection between the sleeve and the rod members. The sleeve has a symmetrical circular tube structure with two ends for sleeving rod members. An outer boss and an inner boss are provided at the axial center of the circular tube. Tapered openings are provided at the open ends of both ends of the circular tube, and a deformation transition section area is provided at the rear of the tapered openings at both ends. Among them, the inclination of the tapered opening is 90° ≤ β ≤ 120°, the inclination of the transition area is 0° ≤ α ≤ 20°, the length of the tapered opening is 0 ≤ L < L1, and the total length of the transition section is L1 ≤ 1 / 4 of the total length of the sleeve. The special anvil includes: two half clamps that can be opened and closed and are hinged, and two anvil half blocks that can be replaced and are respectively embedded and fixed on the inner walls of the two half clamps. The two half clamps are hinged and closed by inserting a pin through the connecting ears. The inner hole formed after the two anvil half blocks are closed is in extrusion fit with the circular tubes at both ends of the sleeve to realize the riveting consolidation between the sleeve and the rod members.

2. The rod connection system according to claim 1, characterized in that: The ratio of the inner diameter to the outer diameter of the sleeve is 1 / 10 ≤ D3 / D1 ≤ 9 / 10, the diameter of the outer boss D2 ≥ D1, and the diameter of the inner boss 0 ≤ D4 ≤ D3.

3. The rod connection system according to claim 1, characterized in that: On the outer walls of the two half clamps, two ear connecting ears are provided on one side along the axial direction, and three ear connecting ears are provided on the other side.

4. The rod connection system according to claim 1 or 2 or 3, characterized in that: On the outer circumferences of the outer walls of the two anvil half blocks, multiple groups of stepped ring grooves and protrusions are provided, and the ring grooves and protrusions of each stepped structure are fitted and fixed with the protrusions and ring grooves provided on the inner walls of the two half clamps.

5. A method for connecting rods, characterized in that It includes the following steps: (1) Select and determine the sleeve parameters according to the dimensions of the connecting rod members and determine the sleeve model, and determine the matching anvil half block model according to the sleeve model. (2) Embed and fix the two anvil half blocks in the two half clamps. (3) Insert a connecting rod member into the hole at one end of the sleeve, and then insert another connecting rod member into the hole at the other end of the sleeve. (4) Move the special anvil close to the connecting member, open the two half clamps prepared in step (2), and make the connecting rod member and the unriveted sleeve be stuck into the special anvil. (5) Close the two half clamps and lock the connecting ears of the two half clamps with a pin. (6) Set the parameters of the power source, start the switch, and use the riveting mechanism to drive the clamp from both ends and axially squeeze the anvil, so that the special anvils at both ends are squeezed until they contact the surface of the outer boss of the sleeve, and the sleeve extrusion is completed. (7) After the extrusion is completed, reset the parameters of the power source, start the switch, and under the axial acting force of the extrusion mechanism, the two special anvils withdraw along the center of the sleeve until the special anvils completely leave the sleeve, and the sleeve extrusion installation is completed.

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