Amorphous bimetallic composite screw spike

Abstract

The utility model discloses an amorphous bimetal composite screw spike which comprises a bimetal screw rod and a locking nut, the bimetal screw rod comprises a shell formed by pouring amorphous alloy and a carbon steel core material poured in the shell, the shell comprises a connecting section and an anchoring section which are integrally formed, a locking thread is arranged on the connecting section, and the locking nut is arranged on the anchoring section. The locking nut is screwed on the locking thread, the anchoring section comprises an upper thread anchoring section and a lower thread anchoring section which are connected up and down, an upper anchoring thread is arranged on the peripheral surface of the upper thread anchoring section, a lower anchoring thread is arranged on the peripheral surface of the lower thread anchoring section, and the spiral direction of the upper anchoring thread is opposite to that of the lower anchoring thread. The upper anchoring thread and the lower anchoring thread which are opposite in spiral direction are utilized, so that the bimetal screw is effectively prevented from rotating in an anchoring agent, and micro upward pulling possibly generated by the bimetal screw under vibration is avoided; and the amorphous alloy is utilized to form good protection on the internal carbon steel core material, so that the service life of the bimetallic screw rod is prolonged.

Description

Technical Field

[0001] The utility model relates to an amorphous bimetallic composite spiral spike. Background Art

[0002] In the installation of existing railway tracks, the rail is fixed on the sleeper through fasteners. To ensure the smooth running of the train, the performance of each fastener needs to be stable. At present, the components still mainly adopt the anchoring method of mortar and quick-drying anchoring agent. This anchoring method has the advantages of good anchoring efficiency and low cost. However, in actual use, after a period of use, multiple disassembly and assembly of the fasteners, and under the vibration of the train, the spikes in the fasteners will rotate and slightly pull out. This phenomenon will cause the pressure of the fasteners to change synchronously, affecting the safe operation of the train.

[0003] In addition, in order to improve the corrosion resistance of the spike, a bimetallic structure is used to manufacture the spike. Generally, it is a structure of a stainless steel shell and a carbon steel core. The corrosion resistance of stainless steel and the toughness of carbon steel are utilized. However, due to the high brittleness of stainless steel, small cracks sometimes appear on the outer layer of the spike during use, resulting in the entry of external corrosive gases or waste water into the interior of the spike, causing the corrosion of the core carbon steel and affecting the service life of the spike. Therefore, the structure of the bimetallic structure spike still needs to be continuously improved. Summary of the Utility Model

[0004] To solve the problem that the spike rotates and slightly pulls out due to multiple disassembly and assembly and the vibration of the train, resulting in changes in the fastener pressure, and the problem that the stainless steel shell of the existing bimetallic structure spike has high brittleness, resulting in small cracks during use, this application proposes an amorphous bimetallic composite spiral spike, which includes a bimetallic screw and a locking nut. The bimetallic screw includes a shell cast from amorphous alloy and a carbon steel core cast in the shell. The shell includes an integrally formed connection section and an anchoring section. A locking thread is provided on the connection section, and the locking nut is screwed onto the locking thread. The anchoring section includes an upper threaded anchoring section and a lower threaded anchoring section connected up and down. An upper anchoring thread is provided on the outer peripheral surface of the upper threaded anchoring section, and a lower anchoring thread is provided on the outer peripheral surface of the lower threaded anchoring section. The spiral directions of the upper anchoring thread and the lower anchoring thread are opposite.

[0005] The bimetallic screw in this application is anchored to the sleeper in an anchoring manner. During anchoring, the anchoring section of the bimetallic screw sequentially passes through the elastic clip and the gauge block and then inserts into the anchoring hole of the sleeper. Then, an anchoring agent is poured into the anchoring hole, and the bimetallic screw is anchored to the sleeper by using the anchoring agent. Then, the locking nut is screwed onto the locking thread of the connecting section. Since the upper anchoring thread and the lower anchoring thread with opposite spiral directions are provided on the anchoring section, it can effectively prevent the rotation of the bimetallic screw in the anchoring agent, thereby avoiding the possible slight uplift of the bimetallic screw under vibration.

[0006] The outer shell of the bimetallic screw in this application is cast from amorphous alloy, and the amorphous alloy is specifically zirconium-based amorphous alloy. Since the amorphous alloy has the characteristics of high strength, high corrosion resistance, and high toughness, it can effectively solve the cracks caused by the brittleness of the stainless steel outer shell in the prior art, and can form good protection for the internal carbon steel core material to improve the service life of the bimetallic screw.

[0007] The manufacturing method of the amorphous bimetallic composite spiral spike in this application includes the following steps:

[0008] (1) Mix the raw materials according to the established ratio and crush them; then melt the raw materials to obtain an alloy pouring liquid. The melting temperature is 1000 - 2000 °C, and the melting time is 30 - 50 min. By weight percentage, the raw materials include the following components: zirconium 53 - 62%, copper 12 - 14%, iron 5 - 8%, nickel 12 - 14%, niobium 2 - 4%, titanium 6 - 15%. The yield strength of this amorphous material is as high as over 1400 MPa. Then evacuate the melting chamber and fill it with argon. The vacuum degree is an absolute pressure of 0.02 - 0.03 Pa, and the argon accounts for 34 - 40% of the volume of the melting chamber.

[0009] (2) Fill the alloy pouring liquid into the mold under vacuum for die-casting to obtain a blank. The vacuum degree is an absolute pressure of 1 - 10 Pa, the feeding die-casting pressure is 20 - 40 MPa, and the holding pressure time is 8 - 15 s.

[0010] (3) Cool the blank. During cooling, first cool it to 260 - 350 °C at a cooling rate of 10 - 20 °C / s and a vacuum degree of an absolute pressure of 1 - 10 Pa, then hold for 5 - 15 s, and then cool it to room temperature at a cooling rate of 20 - 30 °C / s under normal pressure and hold for 5 - 10 s.

[0011] (4) At room temperature, pour carbon steel into the blank and die-cast it to form a carbon steel core material, which becomes the spike body.

[0012] (5) Finally, spray epoxy resin paint on the end face of the spike body away from the anchoring section to complete the production of the amorphous bimetallic composite spiral spike.

[0013] To further improve the anti-rotation ability of the bimetallic screw, an anti-rotation section is provided between the upper threaded anchoring section and the lower threaded anchoring section, and the cross-section of this anti-rotation section is polygonal. By utilizing the polygonal shape of the anti-rotation section, the anti-rotation ability of the bimetallic screw is improved, thereby enhancing the seismic resistance of the bimetallic screw.

[0014] Specifically, for the convenience of processing and to ensure the overall strength of the bimetallic screw, the cross-section of the anti-rotation section is a regular polygon, and the radius of the circumscribed circle of this regular polygon is the same as the radius of the anchoring section.

[0015] Furthermore, to facilitate the positioning of the bimetallic screw during installation, an annular flange is provided between the connecting section and the anchoring section, and this annular flange is formed by radially protruding outward from the outer peripheral surface of the outer shell. By using this annular flange, the insertion depth of the bimetallic screw in the anchoring hole can be conveniently determined.

[0016] Furthermore, to improve the connection strength between the carbon steel core material and the outer shell, internal threads or a number of annular protrusions are provided on the inner peripheral surface of the outer shell, and these a number of annular protrusions are arranged at intervals along the axial direction of the outer shell.

[0017] Furthermore, to prevent external corrosive substances from corroding along the bonding area between the carbon steel core material and the outer shell, epoxy resin paint is sprayed on the end face of the bimetallic screw away from the anchoring section. That is, epoxy resin paint is sprayed on the end face of the connecting section. The connecting section is exposed to the air. Although the carbon steel core material and the outer shell can be tightly bonded together, there are still slight differences in their thermal expansion coefficients, resulting in extremely small gaps between the carbon steel core material and the outer shell, creating corrosion weak points for external corrosive gases or liquids. By using epoxy resin paint to protect the end face of the connecting section, the corrosion rate of the bimetallic screw is reduced and the service life is extended.

[0018] Furthermore, to improve the anchoring stability of the bimetallic screw, a reinforcing flange is provided at the bottom of the outer shell. By using the reinforcing flange, the bottom of the bimetallic screw is formed into an enlarged end, thereby improving the anchoring stability of the bimetallic screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the present utility model.

[0020] Figure 2 is a schematic structural view of the bimetallic screw.

[0021] Figure 3 is Figure 1 the view of the shown drawings after installation is completed. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Refer to Figure 1 and Figure 2, an amorphous bimetallic composite spiral spike 30, which includes a bimetallic screw 31 and a locking nut 32. The bimetallic screw 31 includes a shell 318 made of amorphous alloy casting and a carbon steel core 319 cast in the shell 318. The shell 318 includes an integrally formed connecting section 312 and an anchoring section 313. An annular flange 311 is provided between the connecting section 312 and the anchoring section 313. The annular flange 311 is formed by protruding radially outward from the outer peripheral surface of the shell, and this annular flange is used to play a limiting role during anchoring.

[0023] A locking thread 317 is provided on the outer peripheral surface of the connecting section 312, and the locking nut 32 is screwed onto the locking thread 317. The anchoring section 313 includes an upper threaded anchoring section 315 and a lower threaded anchoring section 316 connected up and down. An upper anchoring thread is provided on the outer peripheral surface of the upper threaded anchoring section 315, and a lower anchoring thread is provided on the outer peripheral surface of the lower threaded anchoring section 316. The spiral directions of the upper anchoring thread and the lower anchoring thread are opposite. To improve the anti-pulling ability of the bimetallic screw, a reinforcing flange 314 is provided at the bottom of the shell.

[0024] To improve the anti-rotation ability of the bimetallic screw 31, an anti-rotation section 310 is provided between the upper threaded anchoring section 315 and the lower threaded anchoring section 316. The cross-section of the anti-rotation section 310 is polygonal. Specifically, in the embodiment, the cross-section of the anti-rotation section is hexagonal, and the radius of the circumscribed circle of the regular polygon is the same as the radius of the anchoring section.

[0025] To improve the connection strength between the shell 318 and the carbon steel core 319, in this embodiment, a plurality of annular protrusions 301 are provided on the inner peripheral surface of the shell 318, and the plurality of annular protrusions are arranged at intervals along the axial direction of the shell. It can be understood that in another embodiment, the plurality of annular protrusions can also be replaced with internal threads.

[0026] To prevent the end face of the carbon steel core away from the anchoring section from being corroded by rainwater, exhaust gas and other corrosive substances, an epoxy resin paint 302 is sprayed on the end face of the bimetallic screw away from the anchoring section.

[0027] Please refer to Figure 3 , the Figure 3 is a structural schematic diagram of the fastener system of the amorphous bimetallic composite spiral spike applied to the rail, that is, the view after the amorphous bimetallic composite spiral spike is installed. The fastener system includes:

[0028] Sleeper 100, retaining plate seat 42, elastic clip 44, amorphous bimetal composite helical spike 30, rail 50, washer 45, gauge retaining plate 43, and rail pad 41. Anchoring holes 110 are provided on both sides of the sleeper 100 corresponding to the rail 50. The two ends of the gauge retaining plate 43 are respectively supported on the retaining plate seat 42 and the rail. The rail pad 41 is located below the rail, and the rail is directly supported on the rail pad 41. The elastic clip 44 is arranged on the gauge retaining plate 43. The anchoring section 313 of the bimetal screw 31 sequentially passes through the elastic clip and the gauge retaining plate 43 and then inserts into the anchoring hole 110, making the lower end surface of the annular flange 211 flush with the lower end surface of the gauge retaining plate 43. Then, an anchoring agent 120 is poured into the anchoring hole to anchor the bimetal screw 31 on the sleeper. The washer is sleeved on the connecting section 312 of the bimetal screw 31 and supported on the elastic clip. The locking nut 32 is screwed onto the locking thread 317 of the connecting section 312.

[0029] The manufacturing method of the amorphous bimetal composite helical spike 30 in this embodiment is described as follows. The specific steps are as follows:

[0030] (1) Mix the raw materials according to the established ratio and crush them; then melt the raw materials to obtain an alloy pouring liquid. The melting temperature is 1000 °C and the melting time is 30 min. By weight percentage, the raw materials include the following components: zirconium 55%, copper 14%, iron 7%, nickel 13%, niobium 3%, and titanium 8%. Then, evacuate the melting chamber and fill it with argon. The vacuum degree is an absolute pressure of 0.02 - 0.03 Pa, and the argon accounts for 34% of the volume of the melting chamber.

[0031] (2) Fill the alloy pouring liquid into the mold under vacuum for die-casting to obtain a blank. The vacuum degree is an absolute pressure of 1 Pa, the feeding die-casting pressure is 20 MPa, and the holding pressure time is 8 s.

[0032] (3) Cool the blank. When cooling, first cool it to 280 °C at a cooling rate of 10 °C / s and a vacuum degree of an absolute pressure of 1 Pa, then hold for 10 s, and then cool it to room temperature at a cooling rate of 25 °C / s under normal pressure and hold for 5 s. The wall thickness of the blank is 5 mm.

[0033] (4) At room temperature, pour carbon steel into the blank and die-cast it to form a carbon steel core, which becomes the spike body.

[0034] (5) Finally, spray epoxy resin paint on the end face of the spike body away from the anchoring section to complete the production of the amorphous bimetal composite helical spike.

Claims

1. An amorphous bimetallic composite spiral spike, characterized in that, It includes a bimetallic screw and a locking nut. The bimetallic screw includes an outer shell cast by an amorphous alloy and a carbon steel core cast in the outer shell. The outer shell includes an integrally formed connecting section and an anchoring section. A locking thread is arranged on the connecting section. The locking nut is screwed on the locking thread. The anchoring section includes an upper threaded anchoring section and a lower threaded anchoring section connected up and down. An upper anchoring thread is arranged on the outer circumferential surface of the upper threaded anchoring section, and a lower anchoring thread is arranged on the outer circumferential surface of the lower threaded anchoring section. The spiral direction of the upper anchoring thread is opposite to that of the lower anchoring thread.

2. The amorphous bimetallic composite spiral spike according to claim 1, wherein An anti-rotation section is arranged between the upper thread anchoring section and the lower thread anchoring section, and the cross section of the anti-rotation section is polygonal.

3. The amorphous bimetallic composite spiral spike according to claim 2, wherein The cross section of the anti-rotation section is a regular polygon, and the radius of the circumscribed circle of the regular polygon is the same as the radius of the anchoring section.

4. The amorphous bimetallic composite spiral spike according to claim 1, wherein An annular flange is arranged between the connecting section and the anchoring section. The annular flange is formed by the outer peripheral surface of the housing protruding outward in the radial direction.

5. The amorphous bimetallic composite helical spike according to claim 1, wherein, An internal thread or a plurality of annular protrusions are arranged on the inner circumferential surface of the shell, and the plurality of annular protrusions are arranged at intervals along the axial direction of the shell.

6. The amorphous bimetallic composite helical spike according to claim 1, wherein Epoxy resin paint is sprayed on the end surface of the bimetallic screw away from the anchoring section.

7. The amorphous bimetallic composite spiral spike according to claim 1, characterized in that, A reinforcing flange is provided at the bottom of the housing.

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