High-wear-resistance relay pushing structure and preparation method thereof

Abstract

The invention discloses a high-wear-resistance relay pushing structure and a preparation method thereof, the structure comprises a pushing rod, a middle layer and an outer layer, and the pushing rod is connected with the outer layer through the middle layer. A blind hole is formed in the outer layer, one end of the push rod extends into the outer layer through the blind hole, and a middle layer is arranged on the inner wall of the blind hole. On the basis of not changing the size of the original pushing structure of the relay, the ceramic outer layer is additionally arranged on the surface of the glass insulator, so that the wear resistance is improved, the problem of wear between the pushing assembly and the reed in the working state is solved, the reliability of the relay pushing rod combination in the using process is improved, and the failure risk is avoided. And through the use of the sintering mold, a plurality of pushing structures can be prepared at a time, and the production efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of relays, and in particular relates to a high wear-resistant relay driving structure and a preparation method thereof. Background Art

[0002] The contact switching inside the sealed relay is achieved by the push rod combination quickly pushing the reed. The material used for the push ball on the push rod combination is glass. Generally, glass beads that match and seal the metal push rod are selected and pressed into shape by the dry powder blank making method. The push rod combination is made by assembling the glass beads and the metal push rod together and sintering at high temperature. The formation of the push ball mainly depends on the surface tension of the glass. During the heating process, the glass beads gradually change from cylindrical to spherical.

[0003] After the glass and the metal push rod are sealed, bent, and electroplated at high temperature, the metal push rod and the armature are firmly welded together through spot welding. Under the action of electromagnetic force, the armature drives the push rod assembly to move together, thereby realizing the switching between the contacts and playing the role of a relay switch. However, every push will cause friction between the push ball and the reed, resulting in the hidden danger of wear. The wear of the push ball is random, the degree of wear varies, and the problem of push ball wear has always existed. After a large number of tests and verifications, it has been shown that the wear of the push ball is not caused by the instability of the sealing process of the push ball. The wear is mainly related to the wear resistance, strength, product assembly structure characteristics, reed thickness and quality of the glass ball itself. It is a comprehensive and complex systemic problem. Therefore, the durability of the glass layer can be improved by improving its wear resistance.

[0004] The patent document with announcement number CN105755443A discloses a method and device for improving the service life of a sealed relay push rod component. The method uses low-energy ion beam technology to deposit a super-hard, wear-resistant and insulating film layer on the surface of the push ball in the push rod component to improve the service life of the push ball in the sealed relay push rod component. The technical route is different from that of the present application. In the present application, an outer layer is added outside the glass layer, which has lower process requirements and can reduce costs in large-scale production. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a high wear-resistant relay driving structure and a preparation method thereof.

[0006] The present invention is achieved through the following technical solutions.

[0007] The invention provides a high wear-resistant relay driving structure, comprising a driving rod, an intermediate layer and an outer layer, wherein one end of the driving rod is covered with the intermediate layer, and the outer layer is covered with the intermediate layer.

[0008] Preferably, a blind hole is arranged on the outer layer, one end of the push rod extends into the outer layer through the blind hole, and an intermediate layer is arranged on the inner wall of the blind hole.

[0009] Preferably, the push rod is made of metal.

[0010] Preferably, the push rod is made of Kovar alloy 4J29.

[0011] Preferably, the intermediate layer is made of DM-305 or DM-308 glass.

[0012] Preferably, the outer layer material is zirconia ceramic.

[0013] A method for preparing a high wear-resistant relay driving structure comprises the following steps:

[0014] 1) Clean the push rod, middle layer and outer layer respectively;

[0015] 2) Oxidation treatment of the push rod;

[0016] 3) Assemble the push rod, middle layer and outer layer and put them into the sintering mold;

[0017] 4) performing a sealing and sintering process on the sintering mold with the pushing structure in step 3) to form the pushing structure;

[0018] 5) Bending the push rod in the push structure formed in step 4);

[0019] 6) Electroplating the pushing structure after the bending process in step 5).

[0020] Preferably, the temperature of the oxidation treatment in step 2) is controlled at 700-750° C., and the oxidation time is controlled at 2-3 min.

[0021] Preferably, in the step 3), the sintering mold with the pushing structure is stably placed into a nitrogen-protected sintering furnace for sealing and sintering, and the sintering mold is made of graphite.

[0022] Preferably, a placement groove is provided on one side of the sintering mold, and a groove is provided on the other side of the sintering mold, and the placement groove is connected with the groove through a through hole.

[0023] The beneficial effects of the present invention are:

[0024] The present invention does not change the original push structure size of the relay, but increases the outer layer of ceramic body on the surface of the glass insulator, thereby improving its wear resistance, improving the wear problem between the push assembly and the reed in the working state, improving the reliability of the relay push rod assembly during use, and avoiding the risk of failure. By using a sintering mold, multiple push structures can be prepared at one time, which helps to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 It is a schematic cross-sectional structure diagram of the sintering mold of the present invention;

[0027] Figure 3 Schematic diagram of the top view of the sintering mold of the present invention;

[0028] In the figure: 1-push rod, 2-middle layer, 3-outer layer, 4-sintering mold, 5-placing groove, 6-groove, 7-through hole. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0030] Embodiment 1:

[0031] like Figures 1 to 3 As shown, a high wear-resistant relay driving structure includes a driving rod 1, an intermediate layer 2 and an outer layer 3. One end of the driving rod 1 is covered with the intermediate layer 2, and the intermediate layer 2 is covered with the outer layer 3. The intermediate layer 2 can be used as an insulator.

[0032] A cylindrical blind hole is arranged on the outer layer 3, one end of the push rod 1 extends into the outer layer 3 through the blind hole, and the middle layer 2 is arranged on the inner wall of the blind hole.

[0033] The push rod 1 is made of metal.

[0034] The push rod 1 is made of Kovar alloy 4J29, and its linear expansion coefficient is similar to that of the middle layer 2, so as to achieve matching sealing with the middle layer 2.

[0035] The material of the middle layer 2 is DM-305 glass, the outer side surface of the middle layer 2 is sealed with the inner wall of the outer layer 3 , and the inner side surface of the middle layer 2 is sealed with the push rod 1 .

[0036] The outer layer 3 is made of white zirconium oxide ceramic. The outer layer 3 is hemispherical on one side away from the push rod 1 and has a cylindrical blind hole structure on the other side.

[0037] The expansion coefficient of the outer layer 3 is greater than that of the middle layer 2, and the outer layer 3 can generate compressive stress on the middle layer 2 to ensure the reliability of the sealing. The expansion coefficient of the middle layer 2 is similar to that of the push rod 1. The surface of the push rod 1 is oxidized at high temperature to form an iron-containing oxide layer that can interact with the glass to form a strong transition layer. The wettability between ceramic and glass, and between glass and metal is good, which can improve the bonding strength between the three.

[0038] A method for preparing a high wear-resistant relay driving structure comprises the following steps:

[0039] 1) Use alcohol to clean the push rod 1, the middle layer 2, and the outer layer 3 respectively;

[0040] 2) Place the push rod 1 in a high temperature furnace for oxidation treatment;

[0041] 3) Assemble the push rod 1, the middle layer 2 and the outer layer 3 and put them into the sintering mold;

[0042] 4) The sintering mold with the pushing structure in step 3) is stably placed into a nitrogen-protected sintering furnace for sealing and sintering to form a pushing structure;

[0043] 5) The push rod 1 in the push structure formed in step 4) is bent using a bending fixture;

[0044] 6) The push structure after the bending process in step 5) is electroplated to finally form a complete relay push rod assembly with high wear resistance.

[0045] In the oxidation treatment in step 2), the push rod 1 is laid flat on a stainless steel plate, and then the stainless steel plate is placed in a high-temperature furnace. The oxidation treatment temperature is controlled at 700° C., and the oxidation time is controlled at 2 minutes. A dense mouse-gray oxide layer is formed on the surface of the push rod 1.

[0046] In the step 3), the sintering mold with the pushing structure is stably placed into a nitrogen-protected sintering furnace for sealing and sintering. The sintering mold is made of graphite and can withstand high temperatures.

[0047] A placement groove 5 is set on one side of the sintering mold 4, and a groove 6 is set on the other side of the sintering mold 4. The placement groove 5 is connected with the groove 6 through a through hole 7. A plurality of placement grooves 5 are set. The middle layer 2 and the outer layer 3 are placed in the placement groove 5 and connected with the push rod 1. The push rod 1 extends from the groove 6 through the through hole 7 into the placement groove 5. The mold can prepare multiple pushing structures at one time.

[0048] Embodiment 2:

[0049] like Figures 1 to 3As shown, a high wear-resistant relay driving structure includes a driving rod 1, an intermediate layer 2 and an outer layer 3. One end of the driving rod 1 is covered with the intermediate layer 2, and the intermediate layer 2 is covered with the outer layer 3. The intermediate layer 2 can be used as an insulator.

[0050] A cylindrical blind hole is arranged on the outer layer 3, one end of the push rod 1 extends into the outer layer 3 through the blind hole, and the middle layer 2 is arranged on the inner wall of the blind hole.

[0051] The push rod 1 is made of metal.

[0052] The push rod 1 is made of Kovar alloy 4J29, and its linear expansion coefficient is similar to that of the middle layer 2, so as to achieve matching sealing with the middle layer 2.

[0053] The material of the middle layer 2 is DM-308 glass, the outer side surface of the middle layer 2 is sealed with the inner wall of the outer layer 3 , and the inner side surface of the middle layer 2 is sealed with the push rod 1 .

[0054] The outer layer 3 is made of white zirconium oxide ceramic. The outer layer 3 is hemispherical on one side away from the push rod 1 and has a cylindrical blind hole structure on the other side.

[0055] The expansion coefficient of the outer layer 3 is greater than that of the middle layer 2, and the outer layer 3 can generate compressive stress on the middle layer 2 to ensure the reliability of the sealing. The expansion coefficient of the middle layer 2 is similar to that of the push rod 1. The surface of the push rod 1 is oxidized at high temperature to form an iron-containing oxide layer that can interact with the glass to form a strong transition layer. The wettability between ceramic and glass, and between glass and metal is good, which can improve the bonding strength between the three.

[0056] A method for preparing a high wear-resistant relay driving structure comprises the following steps:

[0057] 1) Use alcohol to clean the push rod 1, the middle layer 2, and the outer layer 3 respectively;

[0058] 2) Place the push rod 1 in a high temperature furnace for oxidation treatment;

[0059] 3) Assemble the push rod 1, the middle layer 2 and the outer layer 3 and put them into the sintering mold;

[0060] 4) The sintering mold with the pushing structure in step 3) is stably placed into a nitrogen-protected sintering furnace for sealing and sintering to form a pushing structure;

[0061] 5) The push rod 1 in the push structure formed in step 4) is bent using a bending fixture;

[0062] 6) The push structure after the bending process in step 5) is electroplated to finally form a complete relay push rod assembly with high wear resistance.

[0063] In the oxidation treatment in step 2), the push rod 1 is laid flat on a stainless steel plate, and then the stainless steel plate is placed in a high-temperature furnace. The oxidation treatment temperature is controlled at 750° C. and the oxidation time is controlled at 3 minutes. A dense mouse-gray oxide layer is formed on the surface of the push rod 1.

[0064] In the step 3), the sintering mold with the pushing structure is stably placed into a nitrogen-protected sintering furnace for sealing and sintering. The sintering mold is made of graphite and can withstand high temperatures.

[0065] A placement groove 5 is set on one side of the sintering mold 4, and a groove 6 is set on the other side of the sintering mold 4. The placement groove 5 is connected with the groove 6 through a through hole 7. A plurality of placement grooves 5 are set. The middle layer 2 and the outer layer 3 are placed in the placement groove 5 and connected with the push rod 1. The push rod 1 extends from the groove 6 through the through hole 7 into the placement groove 5. The mold can prepare multiple pushing structures at one time.

[0066] Embodiment 3:

[0067] like Figures 1 to 3 As shown, a high wear-resistant relay driving structure includes a driving rod 1, an intermediate layer 2 and an outer layer 3. One end of the driving rod 1 is covered with the intermediate layer 2, and the intermediate layer 2 is covered with the outer layer 3. The intermediate layer 2 can be used as an insulator.

[0068] A cylindrical blind hole is arranged on the outer layer 3, one end of the push rod 1 extends into the outer layer 3 through the blind hole, and the middle layer 2 is arranged on the inner wall of the blind hole.

[0069] The push rod 1 is made of metal.

[0070] The push rod 1 is made of Kovar alloy 4J29, and its linear expansion coefficient is similar to that of the middle layer 2, so as to achieve matching sealing with the middle layer 2.

[0071] The material of the middle layer 2 is DM-305 glass, the outer side surface of the middle layer 2 is sealed with the inner wall of the outer layer 3 , and the inner side surface of the middle layer 2 is sealed with the push rod 1 .

[0072] The outer layer 3 is made of white zirconium oxide ceramic. The outer layer 3 is hemispherical on one side away from the push rod 1 and has a cylindrical blind hole structure on the other side.

[0073] The expansion coefficient of the outer layer 3 is greater than that of the middle layer 2, and the outer layer 3 can generate compressive stress on the middle layer 2 to ensure the reliability of the sealing. The expansion coefficient of the middle layer 2 is similar to that of the push rod 1. The surface of the push rod 1 is oxidized at high temperature to form an iron-containing oxide layer that can interact with the glass to form a strong transition layer. The wettability between ceramic and glass, and between glass and metal is good, which can improve the bonding strength between the three.

[0074] A method for preparing a high wear-resistant relay driving structure comprises the following steps:

[0075] 1) Use alcohol to clean the push rod 1, the middle layer 2, and the outer layer 3;

[0076] 2) Place the push rod 1 in a high temperature furnace for oxidation treatment;

[0077] 3) Assemble the push rod 1, the middle layer 2 and the outer layer 3 and put them into the sintering mold;

[0078] 4) The sintering mold with the pushing structure in step 3) is stably placed into a nitrogen-protected sintering furnace for sealing and sintering to form a pushing structure;

[0079] 5) The push rod 1 in the push structure formed in step 4) is bent using a bending fixture;

[0080] 6) The push structure after the bending process in step 5) is electroplated to finally form a complete relay push rod assembly with high wear resistance.

[0081] In the oxidation treatment in step 2), the push rod 1 is laid flat on a stainless steel plate, and then the stainless steel plate is placed in a high-temperature furnace. The oxidation treatment temperature is controlled at 720° C., and the oxidation time is controlled at 2 minutes. A dense mouse-gray oxide layer is formed on the surface of the push rod 1.

[0082] In the step 3), the sintering mold with the pushing structure is stably placed into a nitrogen-protected sintering furnace for sealing and sintering. The sintering mold is made of graphite and can withstand high temperatures.

[0083] A placement groove 5 is set on one side of the sintering mold 4, and a groove 6 is set on the other side of the sintering mold 4. The placement groove 5 is connected with the groove 6 through a through hole 7. A plurality of placement grooves 5 are set. The middle layer 2 and the outer layer 3 are placed in the placement groove 5 and connected with the push rod 1. The push rod 1 extends from the groove 6 through the through hole 7 into the placement groove 5. The mold can prepare multiple pushing structures at one time.

[0084] Comparative Example 1:

[0085] The existing JZX-012M relay driving structure has a driving rod with only a glass outer layer and no ceramic layer.

[0086] 50 propulsion structures were selected from the same batch prepared in Examples 1-3 and Comparative Example 1, respectively, and loaded into a JZX-012M relay for 200,000 normal propulsions. The propulsion structures were then taken out for testing and appearance statistics. The results are shown in the following table.

[0087]

[0088] It can be seen from the above table that the average mass reduction of the propulsion structures prepared in Examples 1-3 after 200,000 pushes is less than the qualified line of 5%, and there are at most 3 scratches and 0 failures; wherein, the average mass reduction of each embodiment group is: [(initial mass of 50 propulsion structures - mass of 50 propulsion structures after 10,000 normal pushes) / initial mass of 50 propulsion structures]×100%. This indicates that the propulsion structure of the present application has high wear resistance and durability. The propulsion structure in Comparative Example 1 has no ceramic outer layer for protection, and has a high failure rate and low durability after 200,000 push tests.

Claims

1. A highly wear-resistant relay driving structure, characterized in that: It comprises a pushing rod (1), an intermediate layer (2) and an outer layer (3), wherein one end of the pushing rod (1) is covered with the intermediate layer (2), and the outer layer (3) is covered with the intermediate layer (2).

2. A high wear-resistant relay driving structure as claimed in claim 1, characterized in that: A blind hole is arranged on the outer layer (3), one end of the push rod (1) extends into the outer layer (3) through the blind hole, and an intermediate layer (2) is arranged on the inner wall of the blind hole.

3. A high wear-resistant relay driving structure as claimed in claim 1, characterized in that: The intermediate layer (2) is made of DM-305 or DM-308 glass.

4. A highly wear-resistant relay driving structure as claimed in claim 1, characterized in that: The outer layer (3) is made of zirconium oxide ceramic.

5. A method for preparing a relay driving structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) Clean the push rod (1), the middle layer (2) and the outer layer (3) respectively; 2) performing oxidation treatment on the push rod (1); 3) Assemble the push rod (1), the middle layer (2) and the outer layer (3) and place them into a sintering mold (4); 4) performing a sealing and sintering process on the sintering mold (4) with the pushing structure in step 3) to form the pushing structure; 5) Bending the push rod (1) in the push structure formed in step 4); 6) Electroplating the pushing structure after the bending process in step 5).

6. The method for preparing a high wear-resistant relay driving structure according to claim 5, characterized in that: In the step 2), the temperature of the oxidation treatment is controlled at 700-750° C., and the oxidation time is controlled at 2-3 minutes.

7. The method for preparing a high wear-resistant relay driving structure according to claim 5, characterized in that: In the step 3), the sintering mold with the pushing structure is stably placed into a nitrogen-protected sintering furnace for sealing and sintering, and the sintering mold is made of graphite.

8. The method for preparing a high wear-resistant relay driving structure according to claim 5, characterized in that: In the step 4), the sintering temperature is controlled at 950-980° C., and the sintering time is 16-20 minutes.

9. The method for preparing a high wear-resistant relay driving structure according to claim 5, characterized in that: A placement groove (5) is provided on one side of the sintering mold (4), and a groove (6) is provided on the other side of the sintering mold (4); the placement groove (5) is connected to the groove (6) via a through hole (7).

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