JPH04334828A - Switchgear - Google Patents

Abstract

PURPOSE:To improve the operating efficiency and the reliability in a long period without coating a grease as a lubricant material by forming an Ni plating on the surface of a sliding member or a fitting member, and forming a TiC layer through a Ti layer on the surface. CONSTITUTION:Sliding members and fitting members in an operation link mechanism 7 are formed of a material of a steel member a, and a Ni plating of 2 to 10mum is applied by an electric plating on the member a. And, in order to improve the adhesion of the member a and the Ni plating, the Ni plating of 2 to 5mum may be applied after a Cu plating of 1 to 3mum plating is applied. After that, the member a is heated up to a treatment temperature of about 300 to 500 deg.C in a vacuum evaporation device beforehand, and after a Ti layer e is coated beforehand prior to a TiC layer f coating, the surface coating by the layer f is applied. Then four layers including the layer f, and lower layers c, d, and e are formed. Consequently, not only the operating efficiency and the reliability are improved by applying no lubricant, but also the adhesive strength, the abrasion resistance, and the corrosion resistance can be improved.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device incorporated in, for example, an electric motor or the primary side of a power capacitor, and more particularly to an operating link mechanism in this switching device.

0002

2. Description of the Related Art An operating link mechanism in a conventional opening/closing device is constructed as shown in FIGS. 3 to 5.

That is, in FIGS. 3 to 5, a box-shaped insulating case 1 made of an insulating material has a plurality of (only one in the figure) vacuum valve chambers 2 formed therein. A power terminal 3 and a load terminal 4, which serve as a three-phase power source constituting a main circuit, are provided facing each other above and below the insulating case 1, where the insulating case 1 is located. Further, a well-known vacuum valve 5 is installed vertically between the power supply terminal 3 and the load terminal 4, and each fixed electrode 5a of this vacuum valve 5 is connected to the power supply terminal 3, and this vacuum The movable electrode 5b of the bulb 5 is connected to each load terminal 4 mentioned above.

On the other hand, a machine frame 6 is provided on the front surface of the insulating case 1 and is integrated with the truck.A well-known operation link mechanism 7 is connected to the movable electrode 5b of the vacuum valve 5 on the machine frame 6. The drive lever 9 is connected via a drive lever 9 which is pivotally connected to an operating rod 8 by a support shaft 9a.

That is, in the middle of the machine frame 6, there is a charging cam 1.
0 and an arm rod 11 are rotatably mounted on a rotating shaft 12, and a closing spring 13 is connected to the closing cam 10 on this arm rod 11.
It is biased so that it rotates clockwise. Further, a roller (bearing) 14 is attached to the biased position of the input cam 10, and a T
A letter-shaped input catch lever 15 is mounted on a pin shaft 16 so as to project onto the rotation path of the roller 14. Furthermore, one end 15 of this input catch lever 15
a is locked to a charging shaft 17 having a half-moon cross section and integral with an operating shaft of an electromagnet (not shown), and the other end 15b of the charging catch lever 15 is connected to the machine frame 6 by a support shaft 18. It is in contact with a part of the first lever 19 that is mounted on the shaft. Furthermore, the drive lever 9 is connected to a part of the first lever 19 via a connecting rod 20, and furthermore,
The first lever 19 is urged to rotate counterclockwise around the support shaft 18 by a circuit spring 21 having a stronger elasticity than the closing spring 13. Further, a second lever 22 is connected to the upper end of the first lever 19 with a pin 23, and a third lever 24 having a roller 24a is connected to the second lever 22 with a pin 25. . Furthermore, a pin shaft 28 is pivotally connected to one end of the third lever 24, and the free end of a swing arm rod 26 pivotally connected to the machine frame 6 and the base of a trip lever 27 are pivotally connected to one end of the third lever 24. 27
The free end of the trip catch member 30 is connected by a pin 31 to a biased position of a trip catch member 30 which is mounted on the machine frame 6 above the input cam 10 by a support shaft 29. Furthermore, a part of the trip catch member 30 is held by a trip shaft 32 attached to the machine frame 6 and having a semicircular cross section, and this trip shaft 32 receives an opening command for the vacuum valve 5. connected to an electromagnet (trip coil). Therefore, the operating linkage mechanism in the opening/closing device described above operates as follows. 1. About vacuum valve closing operation

In FIG. 4, when a vacuum valve closing command is input, an electromagnet (closing coil), not shown, is excited. Then, the input shaft 1, which has a half-moon-shaped cross section, is connected to this.
7 rotates clockwise, the input catch lever 15 engaged with the input shaft 17 rotates clockwise around the pin shaft 16, so the input catch lever 1
The roller 14 is removed from 5. Then, the charging cam 10 of this roller 14 rotates clockwise around the support shaft 12 due to the elasticity of the charging spring 13, so that the roller 24a in contact with this charging cam 10 is pushed outward. . Then, as shown in FIG. 5, since the second lever 22 and the third lever 24 to which the roller 24a is attached extend substantially linearly, the first lever 19 connected to the second lever 22 rotates to the right around the support shaft 18, so the drive lever 9 is rotated to the left around the support shaft 9a via the connecting rod 20 connected thereto, so the operating rod 8 connected to the drive lever 9 is pushed upward to connect the movable electrode 5b, which is integrated with the operating rod 8, to the fixed electrode of the vacuum valve 5.
Vacuum valve 5 is closed. 2. About opening operation of vacuum valve

In FIG. 5, when a vacuum valve opening command is input, an electromagnet (trip coil), not shown, is excited. Then, the trip shaft 32 interlocked with this rotates in the counterclockwise direction, and the rotation of the trip shaft 32 disengages the trip catch member 30, so the trip catch member 30 becomes a support shaft. 29 in the counterclockwise direction, the trip lever 27, which is integrated with the pin 31 connected to the trip catch member 30, is moved to the right.
The swing arm rod 26 connected to the support shaft 2 by a pin shaft 28 is
6a in the counterclockwise direction, the third lever 24 and the second lever 22 are bent into a “dog” shape by the elasticity of the circuit spring 21, and the first lever 19 is rotated around the support shaft 18. Since it rotates counterclockwise, this first lever 19
By rotating the drive lever 9 around the support shaft 9a via the lever and pulling down the movable electrode 5b integrated with the operating rod 8, the movable electrode 5b is separated from the fixed electrode 5a of the vacuum valve 5. An open circuit is formed (see Figure 4).

[0008] As described above, in order to improve wear resistance and operating efficiency of the operating link mechanism in the above-mentioned opening/closing device, grease as a lubricant is applied to the sliding members and the pivot joints thereof. This allows for smooth operation.

On the other hand, as shown in FIG. 6, the operation link mechanism 7 in the above-mentioned opening/closing device has a base structure including sliding members, fitting members, etc. in order to improve wear resistance and operating efficiency. A steel material (a) was coated with a coating (ceramic thin film) (b) of TiC (titanium carbide), for example.

0010

[Problems to be Solved by the Invention] However, the operating link mechanism in the above-mentioned opening/closing device has grease applied as a lubricant to its sliding members and its pivot joints, so it is difficult to understand the operating environment and aging of the operating link mechanism. The grease deteriorates due to oxidation, and due to this, the oxidation of the grease not only impairs the operating characteristics but also poses a risk of malfunction, and there are disadvantages such as the need for periodic maintenance and inspection.

[0011] Furthermore, when the above-mentioned sliding member or fitting member is made of steel material (a) coated with a single layer of coating material (ceramic thin film) (b), the corrosion resistance, friction, and abrasion characteristics vary depending on the type of coating material (b). Some have a small coefficient of friction but poor corrosion resistance, while others have excellent corrosion resistance but have a large coefficient of friction, and when considered comprehensively from the standpoint of operating characteristics and reliability, there are problems with these.

The present invention has been made in view of the above-mentioned circumstances, and it maintains operating characteristics for a long period of time without applying grease as a lubricant to the sliding members of the operation link mechanism and their pivot joints. It is an object of the present invention to provide a switching device designed to improve reliability. [Structure of the invention]

[0013]

[Means and effects for solving the problems] In order to achieve the above object, the present invention forms Ni plating on the surface of a sliding member or a fitting member made of steel of an operation link mechanism in a switching device that opens and closes a vacuum valve. However, by forming a TiC layer on the surface of this Ni plating via a Ti layer, corrosion resistance and wear resistance are improved without applying grease, and operating characteristics and reliability are improved over a long period of time. . Furthermore, adhesion is also improved by applying Cu plating between the steel material and the Ni plating.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are given to the same constituent members as those of the conventional example described above.

FIG. 1 is a perspective view of the operating link mechanism of the opening/closing device of the present invention, and FIG. 2 is an enlarged sectional view of member A in FIG. 1. In FIG. 1, reference numeral 12 denotes a support shaft mounted on the machine frame 6 of the opening/closing device operation link mechanism 7 for opening and closing the vacuum valve, and the input cam 10 is mounted on the support shaft 12. A roller 14 is attached to the biased position of the input force cam 10, and a T-shaped input catch lever 15 is attached to the machine frame 6 so that it projects onto the rotation path of the roller 14 with a pin shaft 16. It is mounted on the shaft. Therefore, each sliding member and fitting member in the link mechanism 7 described above is made of steel material a. That is, the steel material a of each sliding member and fitting member is plated with Ni by electroplating.
Apply only ~10 μm. Alternatively, in order to improve the adhesion between the steel material a and Ni plating, Cu plating may be applied to 1 to 3 μm, followed by Ni plating to 2 to 5 μm. After that, the steel material a is preliminarily heated to about 300 to 50
Heated to a processing temperature of about 0℃, about 10-5 to 10-4t
Before coating the TiC layer f in a vacuum of approximately
give Next, acetylene gas is continuously supplied for about 1 hour and 40 minutes to form a surface coating of about 3 to 8 μm with the TiC layer f, thereby coating the outer surface of the steel material a with a thin film of lower coating materials c, d and Four layers are formed by e and the upper coating material f. These coatings e and f can be made in a series of steps without taking out or taking out the steel material a.

[0016]

[Table 1]

Table 1 shows that TiC/Ti, TiN/
Ti, TiN/+TiC/TiC and Cu plating +N
A salt spray test was conducted on a ceramic coating material coated with a thin film of i-plating + TiC/Ti, and the corrosion resistance was compared.

As is clear from Table 1, Cu plating +
It was confirmed that the Ni plating + TiC/Ti coating did not generate red rust and had excellent corrosion resistance compared to other products.

Next, the graph shown in FIG.
A with i applied and Cu plating + Ni plating + TiC
These are the results of experimentally measuring the friction coefficient of product B coated with /Ti. As is clear from the graph of FIG. 7, Cu plating + Ni plating + TiC/Ti coating has a small coefficient of friction and stable friction characteristics over a long period of time. Due to these factors, Cu plating +
In order to take advantage of the respective characteristics of Ni plating and TiC/Ti, after applying Cu plating with excellent corrosion resistance + Ni plating layers b and c as a lower layer coating on the surface of steel material a, TiC with a small coefficient of friction is applied on top of the Cu plating with excellent corrosion resistance. By applying the coating of layer f, a coating material having excellent corrosion resistance and wear resistance can be obtained. Next, Table 2 shows the test results of the adhesion strength of each ceramic coated thin film.

[0020]

[Table 2]

As is clear from Table 2, C according to the present invention
U plating + Ni plating + TiC/Ti coating is
It shows almost the same adhesion strength as other coatings. Next, Table 3 shows the wear condition after the wear test.

[0022]

[Table 3]

With no coating, galling occurred at a sliding distance of 20 m. Cu plating + Ni according to the present invention
In the case of a four-layer thin film consisting of plating + TiC/Ti coating, no galling or peeling of the thin film was observed at a sliding distance of 400 m, as with those coated with grease or other coatings. It should be noted that conventional power switchgear and industrial switchgear are considered to have sufficient durability as a product based on the number of operations as long as they have durability for a sliding distance of about 400 m.

[0024] As described above, the operating link mechanism in the opening/closing device according to the present invention is constructed by applying a coating with excellent corrosion resistance to the sliding surface and the fitting surface of the sliding pair, and then applying a coating with excellent friction and wear characteristics. By providing a four-layer thin film, it is possible to improve adhesion strength, wear resistance, and corrosion resistance, as well as reduce the coefficient of friction, prevent galling, etc., and eliminate the need for lubricating oil. This eliminates the need for maintenance and inspection of lubricating oil supply.

[0025]

As described above, according to the present invention, in the operation link mechanism of a switchgear, corrosion-resistant Ni plating is applied to the surface of each sliding member and fitting member made of steel in the operation link mechanism. A TiC layer with a low coefficient of friction and corrosion resistance is formed on the surface of this plating layer, so it is possible to improve adhesion strength, abrasion resistance, and corrosion resistance. Out. In addition, by eliminating lubricating oil, regular maintenance inspections such as disassembly, cleaning, reapplying grease, reassembling, etc. due to deterioration of lubricating oils such as grease over time are no longer necessary, which improves operating efficiency and reliability. You can improve your performance.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the operation link mechanism of the opening/closing device of the present invention.

FIG. 2 is an enlarged sectional view of section A in FIG. 1.

FIG. 3 is a side view of a typical switchgear.

FIG. 4 is an explanatory diagram of the operation of the opening/closing device in FIG. 3.

FIG. 5 is an explanatory diagram of the operation of the opening/closing device in FIG. 3.

FIG. 6 is an enlarged sectional view of an operation link mechanism of a conventional opening/closing device.

FIG. 7 is a diagram showing the relationship between sliding distance and friction coefficient.

[Explanation of symbols]

7... Operation link mechanism, a... Steel material, c... Cu plating, d... Nickel plating e... Ti layer, f... TiC layer.

Claims (2)

[Claims] 1. A sliding member or a fitting member made of steel of an operation link mechanism in a switchgear is coated with Ni on the surface thereof, and the surface of the Ni plating is coated with a TiC layer via a Ti layer. Switchgear. 2. The switchgear according to claim 1, wherein Cu plating is applied between the steel material and the Ni plating.