JPH03165412A - Opening and closing device - Google Patents

Abstract

PURPOSE:To improve action characteristic and reliability over a long period by forming two layers with lower and upper layer coating materials. CONSTITUTION:A closing cam 10 is axis-mounted on a supporting axis 12 mounted on a machine frame in an operation link mechanism 7 in a vacuum valve opening/closing device, a roller 14 is provided on the deviated position of the cam 10, and a T-shaped closing catch lever 15 is axis-mounted on the machine frame so as to be protruded on the rotation passage of the roller 14 with a pin axis 16. In the mechanism 7, a steel material (a), composed of each sliding member and engaging member, is heated, and then coated with a thin film lower layer coating material (c) with ZrO2 vacuum-evaporated. Then moreover heating is made, and a TiC thin film upper layer coating material (d) is coated with an acetylene gas supplied. Thus two layers of the thin film coating materials (c) and (d) are formed on the outer surface of the steel material (a).

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a switchgear that is incorporated into, for example, an electric motor or the next side of a power condenser, and particularly relates to an operation link mechanism in this switchgear. Regarding.

(Prior Art) The operation link mechanism in this type of opening/closing device that has already been proposed is configured as shown in FIGS. 3 to 6.

That is, in FIGS. 3 to 6, a box-shaped insulation case 1 made of an insulating material is formed with a plurality of (only one vacuum valve chamber 2 in the figure) vacuum valve chambers 2. A power terminal 3 and a load terminal 4, which serve as a three-phase power source constituting a main circuit, are provided above and below the insulating case 1, where the insulating case 2 is located, facing each other. 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 Movable electrode 5b of valve 5
are 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 integrated with the movable electrode 5b of the vacuum valve 5 on the machine frame 6. The drive lever 9 is connected to the operating rod 8 via a drive lever 9 which is pivotally mounted on a support shaft 9a.

That is, in the middle of the machine frame 6, there is a charging cam 10 and an arm rod 11.
is rotatably mounted on a rotation shaft 12, and this arm rod 1
1 is provided with a closing spring 13 biasing the official cam 10 to rotate clockwise. In addition, a roller (bearing) is installed at the biased position of the input cam 10.
14 is attached to the machine frame 6, and a T-shaped input catch lever 15 is connected to the roller 14 by a bottle shaft 16.
The shaft is mounted so as to protrude above the rotation path of the shaft.

Further, one end 15a of the input catch lever 15 is locked to a input shaft 17 having a half-moon cross section and integral with the operating shaft of an electromagnet (not shown), and the other end 15b of the input catch lever 15 is , is in contact with a part of one of the first levers mounted on the machine I-7I6 with a support shaft 18. Furthermore, the driving lever 19 is connected to a part of the lever 19 through a connecting rod 20, and this lever 19 is made of a circuit spring 21 having a stronger elasticity than the closing spring 13. It is urged to rotate counterclockwise around the support shaft 18. Further, a second lever 22 is connected to the upper end of the first lever by a pin 23, and a third lever 24 having a roller 24a is connected to the second lever 22 by a pin 25. Further, at one end of the third lever 24, the free end of the swing arm 26 pivoted to the machine frame 6 and the base of a trip lever 27 are connected by a pin shaft 28, and this trip lever The free end of 27 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 with two support shafts. Furthermore, a part of the trip catch part 11 30 is connected to a trip shaft 32 attached to the machine frame 6 and having a half-moon cross section, and this trip shaft 32 is used to open the vacuum valve 5. Connected to an electromagnet (trip coil) that inputs commands.

Therefore, the operating linkage mechanism in the opening/closing device described above operates as follows.

1. Regarding the vacuum valve closing operation, in Figure 4, when the vacuum valve closing command is input,
An electromagnet (throwing coil), not shown, is excited. As a result, the input shaft 17, which has a half-moon-shaped cross section, rotates clockwise, and the input catch lever 15, which is engaged with the input shaft 17, rotates clockwise around the bottle shaft 16. As the roller 14 moves, the roller 14 comes off from the input catch lever 15. Then, the input cam 1 of this roller 14
0 rotates clockwise around the support shaft 12 due to the elasticity of the closing spring 13, so that the roller 24a in contact with this loading cam 10 is pushed outward. Then, as shown in FIG.
Since the lever 22 and the third lever 24 extend substantially linearly, the second lever 9 connected to the second lever 22 rotates to the right around the support shaft 18, so the connecting rod connected thereto rotates to the right around the support shaft 18. Since the drive lever 9 is rotated to the left around the support shaft 9a via the drive lever 9, the drive lever 9 connected to the drive lever 9 is pushed upward, and the movable electrode 5 integrated with the operating rod 8 is moved upward.
b is connected to the fixed electrode of the vacuum valve 5, so the vacuum valve 5 is closed.

2. Regarding the opening operation of the vacuum valve, in Figure 5, when the command to open the vacuum valve is input,
An electromagnet (trip coil), not shown, is excited.

Then, since the trim shaft 32 interlocked with this rotates clockwise, the trip shaft 32 is disengaged from the trip catch member 30 due to the rotational movement, so that the trip catch member 30 is rotated clockwise. The trip lever 27, which is connected to the trip catch member 30 and is integrated with the bottle 31, is moved to the right.
Since the moving arm rod 26 rotates counterclockwise around its support shaft 26a, the third lever 24 and the second lever 22 are connected by the elasticity of the circuit spring 21 in a "dog" shape. ”, and the second lever 19 rotates counterclockwise around the support shaft 18, so this second lever 19 rotates the drive lever 9 around the support shaft 9a via the connecting rod 20. By 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 to form an open circuit (see FIG. 4).

In order to improve wear resistance and operating efficiency of the operation link mechanism in the above-mentioned opening/closing device, grease is applied as a lubricant to the sliding members and the central stone. It is designed to behave like this.

On the other hand, as shown in FIG. 6, the operation link mechanism 7 in the above-mentioned opening/closing device is made of steel material a as each sliding member and fitting member in order to improve wear resistance and operating efficiency. For example, one coated with a Ti (titanium) layer coating (ceramic thin film) b has already been proposed.

(Problem to be Solved by the Invention) However, since the operation link mechanism in the above-mentioned opening/closing device has grease applied as a lubricant to its sliding members and its pivot parts, the grease may deteriorate depending on the usage environment or over time. Due to this, there is a risk that not only the operating characteristics will be impaired, but also malfunction may occur, and regular maintenance and inspection must be performed.

On the other hand, steel materials (a) used as sliding members and fitting members (a) coated with a single layer of coating material (ceramic thin film) (b) have different corrosion resistance, friction, and abrasion characteristics depending on the type of coating material, and the coefficient of friction is small. However, it has poor corrosion resistance, and conversely, although it has excellent corrosion resistance, it has a large coefficient of friction, which is problematic when comprehensively considered from the standpoint of operating characteristics and reliability.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to operate for a long period of time without applying grease as a lubricant to the moving members of the operation link mechanism and their pivot parts. An object of the present invention is to provide a switchgear with improved characteristics and reliability.

[Structure of the invention]

(Means for Solving the Problems and Their Effects) The present invention provides an operation link mechanism in an opening/closing device for opening and closing a vacuum valve. ZrO2 with little generation
The surface of this lower layer coating material is coated with a TiC upper layer coating material that has a small friction coefficient and excellent wear resistance to form two layers. The coefficient of friction of the sliding members and the like is reduced so that they can be used for a long period of time without applying grease, and the operating characteristics and reliability are improved.

(Example) Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used to explain.

In FIGS. 1 and 2, reference numeral 12 denotes a spindle mounted on the machine frame 6 at the operating link machine (t) in the opening/closing device that opens and closes the vacuum valve. 10 is mounted on a shaft, and a roller 14 is attached to the biased position of the input cam 0, and a single-shaped input catch lever 15 or pin 16 is attached to the machine frame 1. It is mounted on a shaft so as to protrude above the rotation path of the roller 14.

Therefore, each Ju moving member and fitting member in the link mechanism 7 described above are made of steel material a, as shown in FIG. That is, as a first step, the steel material a made of the moving members and fitting members of each section is heated in advance to a processing temperature of about 500 to 600°C in a vacuum evaporation apparatus, and then heated to a processing temperature of about 500 to 100°C. Zr02 (siliconia) at a vacuum level of about 4
is vacuum-deposited in a processing time of about 0.5 to 1.5 hours to form a thin film of about 1 to 3 μm as a lower coating material C.
Coating.

Next, as a second step, approximately 500 to 600
Heating to a processing temperature of about 0°C, then about 10-5~
Continuously supply about 80 cc of acetylene gas for about 1 hour and 30 minutes at a vacuum level of about 10-4 to form an upper layer coating material (surface coating material) with a thin film of about 3 to 5 μm made of TiC (titanium carbide) d Coating.

As a result, a thin film of the lower layer coating material C and the upper layer coating material (surface coating material) is formed on the outer surface of the steel material a.
d to form two layers.

Table 1 below shows the results of an experiment in which the state of red rust was measured by a salt spray test on materials coated with ceramics.

Table 1, that is, Table 1 above shows 520C (carbon fv4) untreated material, 5KDII (alloy tool steel), quenched and tempered material, and ceramic coatings of these steel materials a with respective thin films c and d of TiC5Zr02. The materials were subjected to a salt spray test and their corrosion resistance was compared.

Therefore, as is clear from Table 1 above, 320C+
ZrO2 and 5KDI l+Z r02 are Ti
It takes a long time for red rust to develop compared to other products coated with C. In addition, it is understood that the T iCs Z r O2 formed by the two-layer coating material according to the present invention takes a longer time to generate red rust and has excellent corrosion resistance.

Next, the graph shown in FIG. 7 shows the relationship between the sliding distance and the coefficient of friction, which was obtained through experiments.

That is, the graph shown in FIG. 7 is 5KDII+ZrO
2 coated A and 5KD11+Ti
These are the results of experimentally measuring the relationship between C and B after coating.

Therefore, as is clear from FIG. 7 above, B (SK
DI 1+T i C) and C(SKD11+TiC+Z
r02) has a slightly larger friction coefficient at the initial sliding stage than the other A (SKD11+Zr02), but the friction coefficient is small in a wide range after the initial stage.
It has stable sliding properties over a long period of time.

In this way, in order to take advantage of the respective characteristics of TiC and ZrO2 coatings, after applying ZrO2, which has excellent corrosion resistance, as the lower coating material C to the surface of steel material a,
By applying an upper layer coating material d made of TiC having a small coefficient of friction L) on the surface, a coating material excellent in both corrosion resistance and friction properties can be obtained.

Table 2 below shows the experimental results of the adhesion strength of each thin film made of TiC and ZrO2 coated with ceramics.

Table 2 That is, 5KDII quenching and tempering + O and Tic.

The adhesion strength of ZrO2 and ZrO2+TiC thin film ceramic coatings is constant.

Therefore, as is clear from Table 2 above, the adhesion strength of 5KD11+ZrO2+TiC according to the present invention is 5KD
11+ZrO2 and better than that of 5KD11+TiC.

Table 3 shown below shows the wear condition after the wear test.

As is clear from Table 3, that is, the table 3 above, the one without grease and coating has a sliding distance of 20
Although galling occurred in Zr m, the Zr according to the present invention
In the case of a two-layer thin film of O2 + TiC, no galling or peeling of the thin film occurs even at a sliding distance of 400 m, as with those coated with grease or coated with Z'02 or TiC.

Conventionally, power switchgears and industrial switchgears are considered to have sufficient durability as a product from the viewpoint of the number of operations if they have durability of about 400 m in terms of sliding distance.

As described above, the operating link mechanism in the opening/closing device of the present invention is constructed by applying a coating with excellent corrosion resistance to the sliding surface and the fitting surface of the sliding couple, and then applying a coating with excellent friction and wear characteristics.1. By providing a two-layer thin film, it is possible to improve adhesion strength, abrasion resistance, and corrosion resistance, as well as reduce the coefficient of friction, prevent galling, and eliminate the need for lubricating oil. This eliminates the need for maintenance and inspection of lubrication.

〔Effect of the invention〕

As described above, according to the present invention, in the operation link mechanism in the opening/closing device that opens and closes the vacuum valve, each sliding member and fitting member made of steel in this operation link mechanism is provided with Z.
Since the lower layer coating material is coated with rO2 and the upper layer coating material is coated with TiC on the surface of this lower layer coating material, it is possible not only to improve adhesion strength, wear resistance and corrosion resistance, but also to eliminate lubrication. By converting it into oil, the f! ! It is possible to improve the operating characteristics and reliability over a long period of time without applying grease by reducing the number of friction points, and it is also possible to eliminate the need for applying grease, reducing the risk of oxidation caused by aging. This has excellent effects such as eliminating the need for maintenance and inspection using lubricants, as well as eliminating deterioration in lubrication efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of the switchgear of the present invention, FIG. 2 is an enlarged sectional view of chain circle A in FIG. 1, and FIG.
The figure is a side view of the switchgear that has already been proposed, Figures 4 and 5 are diagrams for explaining the action of the switchgear that has already been proposed, and Figure 6 is the side view of the switchgear that has already been proposed. FIG. 7, which is an enlarged view of the main parts of the opening/closing device, is a graph showing the relationship between the friction coefficient and the sliding distance. 6... Machine frame, 7... Operation link mechanism, 15... Closing catch lever, 16... Pin shaft, a... Steel material,
C... lower layer coating material, d... upper layer coating material.

Claims (1)

[Claims] In the operation link mechanism of the opening/closing device that opens and closes the vacuum valve, each sliding member and fitting member made of steel in this operation link mechanism is coated with a lower layer coating material of ZrO_2, and the surface of this lower layer coating material is coated with Ti.
A switchgear characterized by being coated with an upper layer coating material made of C.