A rod connection end and a connection method thereof

Abstract

The present invention discloses a rod connection end and a connection method thereof, and relates to the technical field of rod connection. The rod connection end comprises a rod and a metal sleeve; the metal sleeve is provided with a tapered inner hole, the aperture of the small end of the tapered inner hole is the same as the outer diameter of the rod, the aperture of the large end of the tapered inner hole is 1 to 4 mm larger than the aperture of the small end, the tapered inner hole is used to be sleeved on the end of the rod, and the end of the rod is wrapped with a coating layer in an inverted cone structure. The connection method of the present invention comprises: winding a continuous glass fiber cloth around the connecting part of the rod into an inverted cone shape, then impregnating the structural adhesive, and then tightening the rod into the connector, and then performing a winding fiber impregnation treatment on the other end and pulling it into the connector, and heating and curing the rod with the two ends connected. Finally, the top ends of the two ends are polished, and the resin overflows from the polished surface. The present invention is simple to operate, low in cost, and good in performance. By selecting the material of the fiber winding layer, a higher connection strength and a lower elongation can be met.

Description

Technical Field

[0001] The invention relates to the technical field of rod connection, and in particular to a rod connection end and a connection method thereof. Background Art

[0002] Rod connection is often used in engineering. Rods are made of various materials. Generally, when connecting rods, scratches on the surface of the rods are not allowed. During the connection process, the consistency of the internal and external quality and performance of the rods should be ensured to ensure that the performance and functional technical indicators of the original rods meet the requirements. The connection between metals uses a tapered longitudinal slotted tube and an outer threaded sleeve to tighten and clamp the metal rods, but the connection head must be long enough and the outer sleeve must have a certain thickness. The outer sleeve is relied on to increase sufficient positive pressure to ensure friction and clamping force. With the application of composite rods, the connection of composite pultruded rods cannot be connected in the same way as metal, but should be based on friction, supplemented by the positive pressure applied by the outer sleeve to ensure the strength of the connection and protect the rods at the same time; therefore, a connection structure and connection method for such rods are urgently needed. Summary of the invention

[0003] The object of the present invention is to provide a rod connection end and a connection method thereof to solve the problems existing in the above-mentioned prior art, so that the composite rod has good tensile strength and almost no slippage, avoiding the elongation change that may occur when stretching the connecting piece.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a rod connecting end, comprising a rod and a metal sleeve; the rod is a solid rod structure with a circular cross-section; the metal sleeve is provided with a tapered inner hole with two ends open, the aperture of the small end of the tapered inner hole is the same as the outer diameter of the rod, the aperture of the large end of the tapered inner hole is 1 to 4 mm larger than the aperture of the small end, external threads are uniformly provided on the outer wall of the metal sleeve, the tapered inner hole is used to be sleeved on the end of the rod, and the end of the rod is wrapped with a coating layer with an inverted cone structure.

[0006] Optionally, the covering layer is continuous glass fiber cloth or continuous glass fiber filament bundle.

[0007] The present invention also provides a method for connecting a rod connecting end, comprising the following steps:

[0008] Step 1: Wrap the continuous glass fiber filament bundle around the connecting portion of one end of the rod into an inverted cone shape;

[0009] Step 2: Impregnate the portion of the rod wrapped with the continuous glass fiber filament bundle with structural adhesive, and then tighten the rod so that its connecting portion enters the tapered inner hole of the metal sleeve;

[0010] Step three: wrap the other end of the rod with fiber, dip it in glue and pull it into the tapered inner hole of the metal sleeve, heat and cure the rod with the two ends connected; finally, grind the top of the two ends until the resin overflows from the grinding surface, and then pack and put it into storage.

[0011] Compared with the prior art, the present invention has achieved the following technical effects:

[0012] The present invention uses glass fiber winding to form an inverted cone, which is then pulled into the rod and the structural resin is solidified, which has good tensile strength. At the same time, there is almost no slippage, avoiding the elongation change that may occur when stretching the connector. Continuous glass fiber cloth or continuous glass fiber filament bundles are wound between the inner layer of the casing and the rod, so that the rod connector has high tensile strength, low elongation and long service life. The present invention is simple to operate, low in cost and good in performance. By winding the fibers around the rod ends and curing them with glue, high connection strength and low elongation can be achieved. The technology of the present invention has important application value in the fields of mechanical connection of rods, bridge cables, power cables, petroleum, surface platforms, loading and unloading and hoisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic diagram of the rod connection end structure of the present invention;

[0015] Among them, 1 is a rod, 2 is a connecting head, and 3 is a covering layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The object of the present invention is to provide a rod connection end and a connection method thereof to solve the problems existing in the above-mentioned prior art, so that the composite rod has good tensile strength and almost no slippage, avoiding the elongation change that may occur when stretching the connecting piece.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] The present invention provides a rod connection end and a connection method thereof, such as Figure 1 As shown, the rod 1 is a solid rod with a circular cross-section, and the connector 2 is a metal sleeve with an external thread and a tapered inner hole. The diameter of the small end of the tapered inner hole is the same as the outer diameter of the rod 1, and the diameter of the large end of the tapered inner hole is 1.5 mm larger than the diameter of the small end.

[0021] During the connection between the rod 1 and the connector 2, firstly, the continuous fiberglass cloth is wrapped around the connecting part of the rod 1 to form an inverted cone-shaped coating 3, then impregnated with structural adhesive, and then the part of the rod 1 wrapped with the coating 3 is pulled tight to enter the conical inner hole of the connector 2. The other end of the rod 1 is then wrapped with fiber, impregnated with adhesive, and pulled into the connector 2, and the rod 1 with the two ends connected is heated and cured. Finally, the top of the two ends is polished, and the resin overflows from the polished surface. Continuous glass fiber cloth or continuous glass fiber filament bundle is wound between the inner layer of the metal sleeve and the rod 1, and the glass fiber is impregnated with thermosetting resin and heated and cured. When epoxy resin is used, the heating temperature is 135-150C°, cooled to room temperature, taken out, polished, packaged and put into storage.

[0022] Example 2

[0023] This embodiment is another optimization and deformation made on the basis of the first embodiment. On the basis of the first embodiment, the aperture of the small end of the tapered inner hole is the same as the outer diameter of the rod 1, and the aperture of the large end of the tapered inner hole is 2 mm larger than the aperture of the small end. During the connection process between the rod 1 and the connector 2, the continuous glass fiber filament bundle is firstly wound around the connecting part of the rod 1 into an inverted cone shape, and then impregnated with structural adhesive, and then the part of the rod 1 wrapped with the coating layer 3 is tightened and entered into the connector 2. The other end of the rod 1 is then wound with fibers, impregnated with adhesive and pulled into the connector, and the rod 1 with the two ends connected is heated and cured. Finally, the top of the two ends is polished, and the resin overflows from the polished surface. A continuous glass fiber cloth or a continuous glass fiber filament bundle is wound between the inner layer of the metal sleeve and the rod 1, and the glass fiber is impregnated with thermosetting resin and heated and cured. When unsaturated polyester resin is used, the heating temperature is 125-135C°, cooled to room temperature, the parts are taken out for polishing, and packaged for storage.

[0024] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for connecting a rod connecting end, characterized in that: The rod connecting end comprises a rod and a metal sleeve; the rod is a solid rod structure with a circular cross-section; the metal sleeve is provided with a tapered inner hole with two ends opened, the aperture of the small end of the tapered inner hole is the same as the outer diameter of the rod, the aperture of the large end of the tapered inner hole is 1-4 mm larger than the aperture of the small end, the outer wall of the metal sleeve is evenly provided with external threads, the tapered inner hole is used to be sleeved on the end of the rod, and the end of the rod is wrapped with a coating layer with an inverted cone structure; the coating layer is a continuous glass fiber filament bundle; the connecting method of the rod connecting end comprises the following steps: Step 1: Wrap the continuous glass fiber filament bundle around the connecting portion of one end of the rod into an inverted cone shape; Step 2: Impregnate the portion of the rod wrapped with the continuous glass fiber filament bundle with structural adhesive, and then tighten the rod so that its connecting portion enters the tapered inner hole of the metal sleeve; Step three: wrap the other end of the rod with fiber, dip it in glue and pull it into the tapered inner hole of the metal sleeve, heat and cure the rod with the two ends connected; finally, grind the top of the two ends until the resin overflows from the grinding surface, and then pack and put it into storage.

2. The method for connecting a rod connecting end according to claim 1, characterized in that: The covering layer also includes continuous glass fiber cloth.

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