TWI242221B - Contact switch - Google Patents

Abstract

A contact switch comprises a first switch unit (110), a second switch unit (120), plural first and second fixed contactors (12, 22) as well as plural relay contactors (30). Said first switch unit (110) is housed in a frame and comprising of plural first movable contactors (11) provided with a first and second moval contacts (11a, 11b) at the both ends; and a first magnetic operational assembly (17A) which supports said movable contactors and plural contact spring (15) pushing said movable contactors, and makes said plural first movable contactors act simultaneously. Said second switch unit (120) is housed in the frame and comprising of plural second movable contactors (21) provided with a third and fourth movable contact (21a, 21b) at the both ends, and a second magnetic operational assembly (27A) which supports said movable contactors and plural contact spring (25) pushing said movable contactor, and makes said plural second movable contactors act simultaneously. Said first and second fixed contactors (12, 22) are fixed to said frame, of which one end is provided with fixed contacts (12a, 22a) which respectively make contact with or depart from said first and fourth movable contacts, while the other end is an external connecting terminal. Said relay contactors (30) are fixed in said frame, of which one end is provided with a fixed contact (30a) which makes contact with or depart from the second movable contact, while the other end is provided with a fixed contact (30b) which makes contact with or depart from the third movable contact.

Description

1242221 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a contact switch that closes a circuit between a power source and a load. [Prior art] Opening and closing state of soil contact 'When the short circuit current or other overcurrent 1 flows in the circuit due to its electrical repulsive force and the contact is separated, it is used to prevent arc lightning; HTrgy) The "point switch" is to make the movable contact (_-between the first! State and the second state of resentment in accordance with the excitation and demagnetization) at first, and then move the action set on the movable contact. The contact is fixed and the contact is separated. The contact 2 is equipped with the first one of the contact between the movable contact and the fixed contact. 4 = When an overcurrent flows through the circuit, and the overcurrent The generated state energy is ±, and the third structure that separates the movable contact from the fixed contact is formed into a third mechanism that can hold the movable contact in the third state. There is an open mechanism that can be forced to return from the above = to the! State by moving the contacts that are kept in the third state from above (for example, refer to Patent Document 1) Document 1 Japanese Patent Laid-Open No. 2000-260287 A: 1: The above-mentioned contact opening and closing device called an electromagnetic contactor Support at least 3 normally-open movable contacts by means of a crossbar (cross bar) ~ The contact switch can make the main circuit 3 phase change and the load of your coin or machine to run, which means that the main circuit 3 phase is closed circuit On the one hand, it can make the 3 phases of the main circuit open and stop. 315929 6 1242221 ^ In the above-mentioned contact opening and closing benefits, there are short-circuit welding and abrasion. For reasons of short-circuit welding, you can use The contact switch described in Patent Document 1 can be roughly solved. + Abrasion welding is caused by the three-phase application of Lux Electric's movable contact and fixing in the main circuit of the contact switch 3 phases. ^ Closed and open circuit of the contact ¥ Due to mechanical and electrical damage to the surface of the contact, the contact will become smaller and melted due to wear and tear. The contact becomes smaller. After contact ', because the contact spring is compressed, the contact travel of the pressed contact is small in k, so the mechanical contact springback generated when the movable contact and the fixed contact are closed is also weakened. Strength. Therefore, this movable contact and fixed contact will form a heavy After leaving and re-contacting in a small amount, the surface of the contact is melted and welded by the arc generated at this time. Abrasion welding 'Originally, the probability of producing dazzle welding will increase with the wear of the contact surface, but the friction welding It will also be affected by the unevenness of the finished product of the contactor switch, the opening and closing frequency, the surrounding environment, and the installation conditions, so contact wear will occur more or less. In addition, unlike short-circuit welding, even in the contactor switch A circuit breaker is installed upstream of the power distribution system. As long as the energized current does not exceed the normal range, the circuit breaker will not operate, so the circuit cannot be opened by the circuit breaker. Therefore, even if the contact point opens and closes the applied voltage of the electromagnetic coil, If the main circuit is to be left open, the actual connection keeps the main circuit in the power-on state, which causes the problem that the machine cannot be stopped. In addition, in order to cope with the above problems, it is stipulated that safety measures must be selected in accordance with ISO13849-1 (JIS9705-l) and the like, and in order to improve the safety of the circuit 315929 7 1242221, two contact switches are used in series connection to make it It is also verbose to avoid damage to safety functions due to single-fault. -However, this is the case. Since two contact switches are used, it is necessary to have two units in the control panel. In addition, there is a problem that wiring work is required for two units. There is also the problem of working hours that require 2 sets of 5 tolerant contact wear conditions. In addition, 'Even if 2 two-connector == device' is used, no matter whether the first contactor switch or the second contactor switch has the same contact wear, so it reaches the same wear and tear welding time. The problem of contacting Taiwan's contacts at the same time. In addition, there is a problem that the cost is increased because two contact switches are used. The present invention has been developed by the developer in view of the above-mentioned problems, and its purpose is to provide an = switch, which is not only difficult to produce the contact of the wire, but also can be achieved through contact opening and closing (Satoshi) etc. [Content of the invention] The contact opening and closing device of the present invention is wounded! Η η ,, φ is equipped with the first one contained in the housing: ㈣ Most of the second movable contacts are provided :: 动Contacts; and the first electrical contact device in the branch building that presses and moves the majority of the first movable contacts simultaneously; the second opening and closing device housed in the frame has: Note 4: The second moving contact of the majority of the moving contact; supporting the live 2 = the second electromagnetic that presses the contact with the majority of the moving contact and makes the majority of the contacts work simultaneously Acting; most of the first contacts have one end respectively connected to the aforementioned fourth movable contact 315929 8 1242221. ”Occupy, touch, separate fixed contacts, the other one forms an external connection terminal, and is fixed to the aforementioned Frame; a number of relay contacts, one end of which has a fixed contact that is in contact with and separated from the aforementioned second contact. End having, in contact with the third contact point, the separation of the fixed contact, and is fixed to the casing. According to the present invention, the first frame is provided in the single frame! 2nd = Opening / closing device, so no matter which contact of the opening / closing device is fused: the opening of the circuit can be performed by the opening / closing device of the other side, and the safety function will not be damaged due to failure. In addition, with two movable contact opening and closing circuits with two 2 contacts each, the opening and closing circuit at 4 o'clock, because the arc current rises quickly and the arc can be extinguished as soon as possible, so the arc can be reduced. As a result, the contacts are fused and it is difficult to cause contact melting. In addition, since the connector 2 is housed in the frame and will not be exposed to the outside ', the risk of leakage can be reduced by half compared with the case of the previous connector switch. In addition, the number of man-hours installed on a control panel or the like is reduced by half. The contact switch according to the next invention is characterized in that the movable contact of the aforementioned No. 2 brother is a normally open movable contact. According to the present invention, the contact switch can be used as a three-phase load main circuit switching device. 'Yun Xun Negative 2nd = The contact switch of the next invention, characterized by the aforementioned first and skin steps μ 〃 弟 # 2 The solid contact and the relay contact are arranged in a straight shape in the frame as described above. Inside. Straight green, according to the present invention, it is connected in a straight line through the relay contact, so it can achieve the same space as when two contact switches are arranged in close contact. ΤNo judgement, same as 315929 9 1242221 According to the sub-invention of the _, its special =: Contains the aforementioned H2 electromagnetic actuating clothes set by the security Rongyue] ^ The second movable contact, the first, the second fixed It is composed of a cabinet that touches the quotient and covers the Annongtai. , Follow-up = The present invention, when changing the control voltage of the electromagnetic actuating device, benefit two :; platform: point switch ’just need to replace the housing that houses the electromagnetic actuating device; the tap can be easily changed. In the text, it is clear that the contact opening and closing device 'is characterized in that the aforementioned mounting platform has at least one of a women's groove or a mounting hole. According to the present invention, the installation of a control panel or the like can be simplified. The contact switch of Mao Ming of Zhongkang people is characterized in that: the box is provided with an opening portion, and a cover covering the opening portion is installed. It is necessary to replace each contact with a new one. Gen: According to the invention, the contact switch of the invention is characterized in that the aforementioned first and == 'are pressed on the spring base of the peripheral part or the arc part of the contact surface with the movable contact, and The aforementioned first and second heads are closer to the floor and are supported at positions closer to the cover than the aforementioned first and second fixed contacts. May ^ f ^ Ming 'You can replace the movable contact as long as you remove the cover, for example, replace the contact with abrasion when the contact is worn with a new movable contact during A and A'. Safety of holding the contact switch . Root, the contact inventor invented by the person, is characterized in that: among the aforementioned plurality of moving contacts,-the group is a normally closed movable contact, and the other-the group 315929 1242221 is an open movable contact. When the contacts are in contact with or fused with the contacts of the fixed contact and the relay contact, the circuit containing the aforementioned normally closed movable contact will form a gap between the contacts having a predetermined value or more and be opened. According to the present invention, the contact of the normally open movable contact is in contact with the fixed contact and the middle: When the contact of the subsequent contact is contacted or dazzled, the circuit including the aforementioned normally closed movable contact = there is a connection exceeding the pre-set value. There is a gap between the points. Therefore, even in a state where the excitation of the electromagnetic actuator is released, as long as the circuit including the normally closed movable contact = an open state, any one of the contacts will be welded. With a circuit that includes a normally closed movable contact, a normally open activity can be detected. The contact shutter according to the next invention is characterized in that: a base with a counter-ditch is formed at a substantially central portion of the box, and a pair of protrusions formed on the relay contact are fitted into the Pair of trenches.

According to the present invention, the relay contacts are fixed on a stable base, and need to be glued or fixed with screws. In addition, the structure of the metal frame for manufacturing the box can also be simplified 'and the box can be manufactured at a low price. According to the invention, the contact opening and closing device is characterized in that the relay head is sandwiched between the base and the protrusion provided on the cover. According to the present invention, the relay contact can be stably fixed on the base. : Will separate from the cabinet. 〇 ’And the poor contact switch

^ 1 Ding try fishing · At least one of the first and second movable contacts and the fixed contacts that are in contact with and separated from it, and at least one of the four movable contacts and their contact, the divided fixed contacts, and the fixed contacts The size is different. 315929 11 1242221 According to the present invention, by increasing the contact of either one of the first and second opening and closing devices, it is possible to prevent the large contact from being dazzled, so the first and second opening and closing can be avoided. The device is welded at the same time and has high safety. In addition, if the contacts of the open / close device on the non-closed or open circuit task side are reduced, the contacts can be manufactured at a low cost. —The contact switch according to the next invention, characterized in that: at the aforementioned j, $ 2 movable contact and the fixed contact which is in contact with and separated from it, with the aforementioned third and fourth movable contacts, and in contact with and separated from it Among the fixed contacts, the material of at least one of the movable contact and the Qi contact is different. According to the present invention, for a contact without a closed circuit or an open circuit, which is mainly used for energizing, a contact with a small resistance is used to suppress the temperature rise, and a main poetry contact with a closed or a task is used, You can use high contact performance and high contact materials to improve safety and increase the purpose of using strange life. 〃 The contact switch according to the next invention is characterized in that the aforementioned second and second electromagnetic actuators are connected in parallel in the aforementioned casing and driven by the same control signal. · According to the present invention, the man-hours of wiring to the connection terminals of the electromagnetic actuator can be reduced by half compared to using two previous contact switches. According to the contact-opener of the invention, it is characterized in that: the second opening / closing t㈣ sets the time difference in the closed-time sequence towel to close the circuit in the same order. According to the present invention, in the case of parallel hanging, the closed and open agricultural contact will generate an arc, and the contact caused by the arc will not occur. Therefore, Dimension 315929 12 1242221 maintains a high degree of fusion resistance, and because The contacts of the first and second opening and closing devices are not welded at the same time, so the safety is high. Tian ^ The contact switch according to the next invention is characterized in that the aforementioned first and second: the opening and closing of Pei 2 sets a time difference in the sequence of the open circuit, and performs the open circuit in the same order from time to time. 4 _ According to the present invention, the contacts of the opening and closing device of the rear open circuit do not generate an arc when the circuit is opened, and the contact caused by the arc does not melt, so it can maintain a high degree of fusion resistance. 2 The contacts of the opening and closing device will not be welded at the same time, so the safety is high. ㈢ _ 々 The contact switch according to the next invention is characterized in that the time difference is set in the closed circuit and the open circuit sequence by the aforementioned second second opening and closing device, so that the opening and closing device that is closed first can be opened afterwards, and The closed-circuit task and open-circuit task of the open-close device after the material is closed. According to the present invention, since there is no closed-circuit task and open-circuit task in the opening and closing device that is closed first and then opened, the high welding resistance can be maintained, and the contacts of the first and second opening and closing devices are not welded at the same time. high. Xin The contact switch according to the next invention is characterized in that there is no arc extinguishing part in the opening and closing device without a closed circuit task and an open circuit task. According to the present invention, since no arc extinguishing parts are provided in the opening and closing device having no closed circuit task and open circuit task, it is possible to manufacture a contact safety switch with high safety at a low price. [Embodiment] In order to further explain the present invention in detail, the embodiment will be described based on the drawings. 315929 13 1242221 Figure 1 is a front view showing the appearance of the contact shutter of the present invention, Figure 2 is a left side view of Figure 丨, Figure 3 is a top view of Figure〗, and Figure 4 is a view of Figure 1. FIG. 5 is an oblique view of the back side of FIG. 5. The frame of the contact opening / closing device 100 is composed of: an electromagnetic actuating device and the like to be described later, and the contact opening / closing device 100 is mounted on a control board 3, etc .; A casing 丨; and a cover 2 covering the opening on the front side of the casing 1 and the like. Make the grooves 2za and 2zb 'provided in the cover 2 and the boxes respectively! The projecting portion iza W (see Fig. 10) on the upper side is engaged with the casing 2 to the casing i. Box! It is fixedly connected to the mounting table 3 at three positions via mounting screws, wires 31x'31y, and 31z. In addition, in this example, although the box 1 and the mounting table 3 are fixedly connected by three installations, considering the durability of the machine, the number of mounting screws can be reduced to two, or separately in the summer of the box and A mounting joint is provided on the mounting table 3.

"On the back of the mounting table 3, a control channel such as a control panel is embedded, and a contact shutter is formed in the rail toward the left and right direction! One side wall of the groove 3Z of 〇〇 is provided with 2 fixed Hook 3za, 3zb, and the other side wall 'is provided with a live spring_4 that presses the spring 5 to advance the front end into the groove. Insert the track into the groove and use the fixed ⑴I to hold the road. ^ This will open the contact switch ⑽ 安 #In the handle, middle ° & outside 'When the contact switch 1⑼ is removed from the rail, a screwdriver can be inserted into the groove 4z provided on the movable hook 4 and pulled outward, and the movable hook 4 is opened by Pull back in the groove 3Z to remove the contact shutter. 315929 1242221 By installing on the mounting table 3 & Zhuang%, the women's clothing holes 3Ha, 3Hb of the clothing port j, and mounting screws (not shown), etc. The contact n pq οσ t A a ^ can be installed at a position other than the position of the track X such as the control panel. As described above, the contactor HK of this embodiment is installed at the control panel, etc. The working hours of the hour are not much different from the working hours of the installation of the former. Figure 6 of the closure shows the state of the cover 2 and the cabinet in the state of k The perspective view of the point switch ⑽ 'Figure 7 is a layout view of the movable contact as seen from the back side. The contact opening and closing H 1G ()' includes: a main road with a plurality of poles (3 poles) and a 1 pole The first opening and closing device 1H) and the second opening 120 of the auxiliary circuit are connected in series. The first opening and closing device u0 and the second opening and closing device ㈣ are connected in series. The gate-shaped first and second cross bars 13, 23, Department: Do not support the normally open movable contacts u, 21 of the 3 poles and the normally closed activities of the poles: heads 41, 42. The cross rods 13 and 23 of the second section can cause the majority of the movable contacts to move at the same time. Fig. 8 is a cross-sectional view formed by Am of Fig. 1 and Fig. 9 is a cross-sectional view formed by line BB of Fig. 1. < At both ends of the first normally open movable contact 11 of the majority of the main circuit, Respectively: there are the first and second normally open movable contacts 11a and 11b. The majority of the contacts impeach the -end of the 15, and the spring seat 32a is used to press the two parts of the first normally open movable contact u to the set. Under most of the square window holes of the first cross bar 13, = the normally open movable contact u is supported by the i cross bar 13. The other end of the contact Η 5 is cut in the first cross bar 13 Count the upper side of the square window hole. The contact strong emperor 1 < material feed connection 'turn only 15, apply contact pressure to the brother 1, the second normally open movable contact 11a, lib. 315929 15! 242221 In the box M, the Can be installed to the side of the mounting platform 3: The end of the mounting platform 3 side is equipped with two movable iron cores. The equipment is equipped with wires ... Fixed II: The core 18. The fixed iron core 19 is moved :: ,, 1 8 2 is attracted by magnetization, Q ^ ^,, _. ^, Between moving and load ~ 18, there is a fixed core when the core springs 箬: can be pushed back to the movable core to restore it to its original position: == The moving iron core 18, the fixed iron core 19, and the coil system constitute the first electromagnetic actuator. In addition, the second contact: the second and contact spring 15, and the first normally open movable contact 11 seek the system brother! Opening and closing device 11〇. The majority of the main circuit, the second, and the private prince-s have the third and fourth constant fm aunts, and the two ends of the touch are respectively equipped with the fourth book opening activity contact training and 2u. Most of the contacts are at one end of the spring 25, and the second normally open movable contact η is separated by a spring seat, and the bottom of most of the square window holes of the second cross bar 23, and the second suspended movable contact The head 21 is the second end of the second cross rod 2] 5, and is supported on the upper side of the square window hole provided at the second cross rod 23. The contact spring 25 'applies a contact pressure to the third and fourth normally open movable points 21b and 21a. In the cabinet 1, to the side of the installation platform 3 of the cross bar 23 for 3 days, the installation of the cross bar 23 on the side 3, the installation of the installation method of the third place where you have a movable iron core In the mounting frame 3 of the 28 frame body, a fixed iron core 29 having a coil 27, 29, the fixed iron core 29 'are facing the movable iron core 28, and the movable iron core 28 is attracted by magnetization. Between the fixed iron core 29 and the movable iron core 28 'is provided that when the magnetization of the fixed iron core 29 is released', the movable iron core can be pushed back to restore it: shape = 315929 16 1242221 return spring 24. The second cross bar 23, the movable iron core 28, the fixed iron core 29, the coil 27, the return spring 24, and the like constitute a second electromagnetic actuator 27A. The second electromagnetic actuator 27A, the contact spring 25, the second normally open movable contact 21, and the like constitute a second opening and closing device 120. Most of the first and second fixed contacts 12, 22 are provided at the upper and lower ends of the middle section of the box 1, and one end is provided with fixed contacts 12a that can contact and separate from the first and fourth normally open movable contacts, respectively. 22a, the other end forms an external connection terminal, and terminal screws 16, 26 are screwed into it. A large number of relay contacts 30 are provided in the center of the middle portion of the cabinet 1. One end has a fixed contact 30a that can contact and separate from the second normally open movable contact 11b, and the other end has a third contact 30 The normally open movable contact 21b contacts and separates the fixed contact 3Ob. The first and second normally-open movable contacts (11, 21), the first and second fixed contacts (12, 22), and the relay contacts 30 are arranged in a linear shape in accordance with the poles of the main circuit Inside. When the first and second electromagnetic actuators 17A and 27A are activated and the first and second opening and closing devices 110 and 120 are closed, the relay contacts 30 can be used to make the The second opening and closing devices 110 and 120 are connected in series. With this relay contact 30, not only the wiring provided between the two previous contact switches is not required, but also the purpose of saving space can be achieved. The three-pole external connection terminals of the main circuit are only external connection terminals and terminal screws 16 formed on the other end of the first fixed contact 12 and external connection terminals and terminal screws 17 formed on the other end of the second fixed contact 22 17 315929 1242221 26 and formed on the second sub-screw 16, the external connection terminal of the disk κ /, and the other end of the head 22 are connected to the * * ~ ~, and the wiring of the second fixed contact ^ ^ 4 ^ ^ ^ ^ ^ " 2 6 5 # # ^ #] ―Forming a power source =: 3-pole wiring of the main circuit of the switch: this: '= The previous contact, 7 is the same as green. In addition, by placing the external connection terminal on the relay contact 30 and covering it with the cover 2, the relay contact 30 can be prevented from contacting the outside and leakage can be prevented. Capacity 2 == The contact opening / closing device 100 of the embodiment is received in a frame, and is set by J / 纵, even if any one of the opening and closing settings produces contact melting, it can be replaced by another " The square opening and closing device opens the main circuit, so the safety function will not be damaged due to a failure. = 1G picture is a squint view of the contact switch ⑽ in the state where the cover 2 is removed. "U picture is a schematic diagram of the main circuit of the contact switch 100, No. 12 ^ is a schematic diagram of the auxiliary circuit of the same figure, No. 13 The diagram is an oblique view 0 and a contact switch 100 of the back of the cover 2. In addition to the 3 poles of the main circuit, it also has one pole, both ends of the jth normally closed movable contact 0 of the auxiliary circuit. The second and second normally closed movable contact 41a and cents are provided. One end of the contact spring 71 presses the center of the first normally closed movable contact 41 against the center of the first normally closed movable contact 41 on the square window hole provided on the cross bar 13 and the first normally closed movable contact W is Supported by the cross bar 丨 3. The other end of the contact spring 7 丨 is supported below the square window hole provided with a cross rod U. The contact spring 71 applies a contact pressure to the first and second normally-closed movable contacts 41a and 41b. 315929 18 1242221 The second normally closed movable contact of the auxiliary circuit 42 ^ 4 The normally closed movable contact is false, 42 and 'so there is a third, third spring seat 82 which separates the second normally closed, tongue-moving end' [Ball of the office of the telegraph pole B]] Click the second bullet? : Closed movable contact 42 is made of ten cross rods-window hole; side. Next normally closed _ point cent, 仏 exerts a force ^ 72 'on the 3rd and 4th upper and second fixed contacts 51, 52, which are arranged in the middle of the box 1, and the ends of Γ and Γ are respectively Contacts with the first and fourth normally closed movable contacts: End: The other ends of the fixed contacts 51a and 52a 'form external connection terminals, and terminal screws 61 and 62 are screwed into them.中继 In the middle part of the upper section, a relay contact 2 is provided: it has a fixed contact that can be contacted with and separated from the second normally closed movable contact m = the other end has a contact that can be contacted with and separated from the third normally closed movable contact 42b Fixed contact 40b. Press the first of the auxiliary circuit! 2nd normally closed movable contact 41, electric circuit, No. 1 normally open movable contact ", 21 act simultaneously. ~, 1st, 2nd normally closed movable contact 41, 42 at 1st, 2nd electromagnetic When the actuators ΠA and 27A are in the non-excitation state and the main circuit 3 of the contact switch 100 is extremely open, the crossbars 13 and 23 will be pushed to the front direction by the return springs 14 and 24 to make the normally closed movement. The contacts 41a, 41b, 42b, and the dry contact with the fixed contacts 51a, 40a, Yang, 52a, and the contact springs 71, 72 are contracted only by a predetermined amount. This compression force is applied to the third piece 315929. 19 1 The normally closed movable contacts 41 and 42 ′ form a contact M force of the contact. Here, the 1242221 contact switch 100 is in a state where the first and second electromagnetic actuators 17A and 27A are non-excited, and When the main circuit 3 is very open, the gap between the movable cores 18, 28 and the fixed cores 19, 29 is ST, and the normally open movable contacts 11a, lib, 21b, 21a and the fixed contacts 12a, 30a, 3 〇b, 22a

When the gap between the contacts is ga, it can be set to ST > and the contact springs 15 after the normally open movable contacts Ua, lib, 21b, 21a and fixed contacts 12a, 30a, birds, 22a are in contact with each other. A compression amount of 25 ° Ta can be expressed as 〇Ta = sT-ga. The contact switch 100 is set to satisfy the formula ST> 0Ta + 0Tb. That is, when the main circuit is closed due to ga> 0Tb, the normally closed movable contacts 41a, 41b, 42b, 42a and the fixed contacts 51a, 40a, 40b, 52 & Separate the movable contacts Ua, llb, and win 21a into contact with the fixed contacts 12a, ^ Road ^ crane 22a 'Even if these are in a state where they cannot be separated due to the fusion, the normally closed movable contacts of the auxiliary circuit are becoming The gap between the ga-oTb and the fixed contacts 51a, 40a, 40b, and 52a can also be ensured. therefore,

When the three poles of the main circuit of one of the first and second opening and closing devices 110 and 120 are welded, even if the excitation of the first and second electromagnetic actuators 17A and 27A is released, the auxiliary circuit is not closed. It can be known that one of the contacts is dazzling. That is, the welding of the contacts can be diagnosed using the auxiliary circuit. The contact shutter of this embodiment is just installed in the grooves 2za, 2zb of the cover 2 (see Zhaojindijin: Department of “Sister 1”, Ev. 3), and it is set in the box cover to bite 21Zb ( * According to Figure 1G), it was able to remove the eight-head mesh body 1. In the box 1, the front side and the upper and lower 315929 20 1242221 surface are provided with openings, which will cover the front side and the upper and lower sides. Open the obfuscation and remove the day guard. You can view the inside of the cabinet and detect the wear of all contacts. That is, you do n’t need to open 2 more contacts to detect the wear status of the contacts. Steps of clicking the cover of the shutter. Figure 14 shows the contacts in the state where the cover 2 and the terminal screw 16 are removed, the oblique view of the shutter, Figure 15 is the bottom view of Figure 14, and Figure 6 Part Z (external connection terminal) in Fig. 15 is an enlarged view. The second electromagnetic actuators 17a and 27a of the contact switch 100 are abutted on the first and second cross rods 13 in a non-excited state. The height of the first and second normally open movable contacts u, 21 of the 23w under the square window hole of 23 is only higher than that of the second fixed contacts 12, 22 The distance in the figure M: D. Therefore, as long as the cover 2 'is removed, the second normal-open movable contact 11, 21 of the second can be easily pulled out from the tenth poles 13, 23. Fig. 17 is a front view of the contact shutter 100 in the state of removing the cover 2, the terminal screw 16 and the normally open movable contact, and the state of 1, 21; The enlarged view of the crotch part (fixed insertion and insertion part) in Figure 18. The state of the box i after the normally open movable contacts 11, 21 are inserted and pulled out = shown in the figure. The fixed contacts 12, 22 are only moved in accordance with The main circuit & the box provided on the source side and the load side of the box! The groove 1χ (see Fig. 19) is pressed in, so it can be removed as long as it is pulled out. Θ Figure 20 is c_c of Figure 17 Sectional sectional view formed by the line), 21st 糸 g 1 7 @ > η η μ ~ Sectional view formed by the second line of touching the flute, Figure 22 is a perspective view of the center of the spring seat, and Figure 23 is ^ Figure 315929 21 1242221 side view, FIG. 24 is an oblique view of the state in FIG. 17 with the fixed contacts U, 22 and the relay contact 30 removed, and FIG. 25 is an enlarged view of the center of the box 1 See Figure 26 is a perspective view of the relay contact 30, Figure 27 is a front view of Figure 26, Figure 28 is a side view of Figure 26, Figure 29 is a bottom view of Figure 26, and Figure 30 This is a perspective view of a modified example of the relay contact. The relay contact 30 is fixed to a pedestal provided at the slightly central portion of the box j for 1 h, and the first and second normally open movable contacts are removed. After 2 and 2 丨, you can pull out and remove it in the front direction of Fig. 17. _ The i-th, second fixed contacts 12, 22 and relay contacts 30 of a contact wear are replaced with new parts and reinstalled separately. Then, install the new first and second 4: open movable contacts U, 21 again on the first and second cross bars 13, 23, and as shown in Figure 23, in the spring seat 仏, coffee Since the peripheral part of the contact surface with the normally open / tongue moving contacts 11 and 21 is provided with a beveled face coffee, the front ends of the first and second normally open movable contacts n and 21 are inserted into the inclined face 邛 32d, The spring seats 32a and 32b will contend the contact spring M, and the pressure is equal to the front surface, so that the first and second normally open movable contacts can be inserted into the square window holes of the cross bars 13, 23 Inside. The inclined surface 32d may also be formed in an arc shape. As explained above—When checking the contact wear status, the contact replacement procedure is simple, so it is possible to form a pedestal by periodically maintaining the contact shutter just to prevent contact welding, as shown in Figure 24 A pair of grooves lhd are arranged in the base of the main circuit in accordance with the poles of the main circuit, as shown in FIG. 25, at the slightly central portion of the cabinet 1 315929 22 1242221 lh. On the other hand, as shown in Fig. 26, a pair of projections 30dm and 30dn are formed in the relay contact 30. As shown in FIG. 20 and FIG. 21, the protrusions 30dm and 30dn can fix the relay contact 30 in the case i by inserting a pair of grooves Ihd of the base ^. The groove lhd is tightly engaged with the projections 30dm and 30dn, and the relay contact ⑽ is firmly fixed in the case 1. In addition, as shown in FIG. 13, a protrusion 2 d is provided in the cover 2, and the relay contact 30 is sandwiched and fixed between the protrusion 2 d and the pedestal ih (see FIG. 6). The cabinet 1 is disengaged. As shown in Fig. 6 and Fig. 25, the stands h and lrb for supporting the contact portion of the relay contact 3G from the back are provided on the main circuit 3 poles respectively]. Since the part close to the contact point of the relay contact 30 is from the two branches, the machinery formed by the opening and closing of the contact point will not be deformed by the load V. In addition, as shown in Fig.%, By making the cross section of the relay contact 3G slightly sloping, the mechanical strength can be obtained even if the pedestals Ira and lrb are not provided. The relay contact 40 of the auxiliary circuit is also fixed in the case 1 in the same way as the contact 30 of the main circuit. 3rd! The picture shows the contact shutter! 〇〇 Disassembled into the box] side and the box when the 3 side is installed] side internal perspective view 'Figure 32 is the same internal perspective view of the installation side, Figure 33 shows the contact switch _ 1 plus The control circuit diagram in the column, Figure 34 shows the contact opening and closing _ control circuit diagram of the embodiment 'Figure 35 shows the contact switch 100 of 315929 23 1242221 1: = control circuit diagram' Figure 36 shows the opening and closing of the contact器 10。 10. The control circuit diagram of the 4 palladium example. The control circuit of the contact switch will be described below. _ 17 is connected to the coil connection terminals 10a and 10b, and the coil connection terminals i0a and ⑽ are provided with terminal screws 20a and 20b. The coil 27 is connected to the coil 17 in parallel with the coil 17 via a connection line of Anongtai :::: not shown = 〇a: b. Therefore the contact opens and closes ... . No.〗, 2nd opening and closing, 2nd mi ’dream driven by the same control circuit. In addition, the control circuit for driving the first and second sections 110 and 120 is arranged at △ 3 and fixed to the bottom by the casting agent 33 to form an insulating state port. # In addition, to change the control electronics of the contact switch 100, just replace the part of the mounting table 3 that is not shown in Figure 32. The first, second, and thirty-sixth figures are the control first] and the second opening and closing device η. · ”Example of the control circuit. The control circuit is provided with: =, rectifier 8, etc. The contact openings of this embodiment = two lightning, examples of the control circuit shown in Figure 34. The following description applies to each" | J circuit The operation of the lower contact shutter 100. In the case of the control circuit of the first embodiment of T at 33 s, the second switching device 110, 120 maintains both closed and open circuits at the same time. 1 When it is before I, among the poles of the main circuit The arc is interrupted at 4 o'clock, which is more accessible than the case where the contact switch interrupts the arc at 2 o'clock. Because the arc can be interrupted early, it will reduce the "occupation load" caused by the arc and reduce the connection. Point wear, and it is not easy to produce contact dazzle. When using the control circuit of the second embodiment not shown in Figure 34, when the closed circuit is 315929 24 1242221, it is tied to the first bucket M 爿 ^ ^ 幵U 0 forms a closed circuit and the relay is closed only after the circuit is closed, and the closed circuit is set at 120. When the circuit is open, the i, 2 opening and closing devices Π0, 120 form an open point at the same time, even in the green solid cleaning technology package w 0 / 2. There are two open connection terminals 6 and 10b. The control signal is input. In the state where the second circuit is opened, the 27th line of the coil of the second opening and closing device 120 is an empty signal. Therefore, only the first opening and closing is performed. Device η. The first] opening and closing; the entry control signal 'only the first opening and closing device f 110 forms a closed circuit. In Jilei 1:: 110 formation In the closed circuit, the moving cross bar 13 is set at 1, 2 = l "s (refer to Fig. 32). When the switch "is pressed, the relay will be closed and the IM f coin opening contact will be closed, and the second opening and closing device 120 will enter the f-signal 'to make the second opening and closing device 120 closed. Open circuit, the coil connection terminal 10a, and the control signal disappear, and the excitation of either side of the coil # ⑴ will be released, so the first and second opening and closing wide door Η㈣ 120 will open at the same time. When closed, generally due to The first " set 110 is closed first, so generally only the 2nd-closing device 120 will generate an arc when closed. Therefore, the first opening and closing device m ^ contact will not increase the load caused by the arc during the closed circuit. In addition, when the circuit is open, the arc of the main circuit is interrupted at 4 o'clock, so the arc can be interrupted earlier than the previous contact switch which interrupted the arc at 2 o'clock. Because the arc can be interrupted as early as possible, the load applied to the contact due to the arc during the open circuit will be reduced, thereby reducing the contact wear. In this control circuit, as long as no arc is generated when the circuit is closed, the first The wear of the contact of the opening and closing device ιι〇 is less than that of the second opening and closing skirt The state of wear of the contact at 12 °. The '; contact of the opening / closing device 110' is more difficult to produce than the contact of the second opening / closing device i 120 315929 25 1242221. 4 At the same time, if the contacts of u0 and 12o are installed, the dual-functionality will be reduced. Even if the contact of the second device _ is melted ^, the main circuit can be opened by the first opening and closing device 11o, so the safety is low. At 0 o'clock, when the control circuit of the third embodiment shown in the figure, when the circuit is closed, the first and second opening and closing devices 110 and 12 0 simultaneously form a closed circuit, and the open circuit: 2: The first opening and closing device is required after the opening of the closing device 120. Christine 6: The reason for the time difference in the sequence of the open circuit is because: Electric Valley 7 # coil 27 is connected in parallel, and the full-wave rectifier 8 is _ when the control signal from the coil connection terminal 10a, the coil? After the excitation of 27 is released, it will also be excited by the capacitor 7. The discharge current of the capacitor 7 is full-wave rectification; the closed circuit is not passed into the coil 27. When the circuit is open, it is usually opened by the second. Therefore, 'only the second opening and closing device m plus ... L generates an arc when opening, and does not increase the contact point of the first opening and closing device 110 = When the circuit is closed, the first and second opening and closing devices! Simultaneously form closed circuits. Strictly speaking, the closing time of the contacts of the first and second opening and closing devices 110 and 0 is different. Form any closed circuit first:: Γ Γ. Where exactly will the arc occur when the circuit is closed-the contact is 'equal', so you can determine the size of the contact or core and the gap #H The probability of generating an arc at the time will be approximately the same, and the two contact groups of the arc when the force is closed will generate contact miscellaneous while bearing a load of approximately π degree. In this control electricity, only Z 315929 26 1242221 Γ :: To produce the electric arc, the contact grinding of the contacts of the first opening and closing device u0: hair '..., the contact wear of the contacts of the second opening and closing device 120, and the contacts of the first and second closing devices 110 and 120 simultaneously Possibility of welding

When the contacts of the door opening and closing device 120 are welded, the main circuit can be opened by the first garment U0, so the safety is high. In addition, when the control circuit is applied in the case of the non-closed task, the contact of the first opening and closing device 0 often does not generate an arc, so the effect is better. When applying the control circuit of the fourth embodiment, which is not described in item 36, when the circuit is closed, the first opening and closing device 11 must be opened after the circuit is closed, and the second circuit is opened. When the circuit is opened, it must be opened at the second opening and closing device 12 〇 Open circuit: Only after the opening and closing device 11 of the brother 1 opens. The time difference occurs between closed and open circuits for the same reason as the control circuit shown in Figure 34 and Figure 35. In this control circuit, the contact of the first opening and closing device ， does not generate an arc whether it is closed or open. Therefore, the contact of the first opening and closing device 110 does not consume the contact except for mechanical wear. : The contact wear of the first opening and closing device 11 〇 will often be less than that of the second opening and closing device i Shan: contact wear 'and the i and the second opening and closing device! The possibility of simultaneous welding of the 10 and 12 contacts will also be reduced. At the contact of the second opening and closing device 120, the possibility that the circuit can be opened by the first opening and closing device 110 will increase the probability of "high, high, and safety." Sex is also high. In addition, in this control circuit, an arc can be prevented from being generated in the contact of the first opening and closing device 110, so it is not necessary to provide arc grids 9a and 9b in the first opening and closing device (refer to FIGS. 6 and 13), and Reduced costs. _ With regard to the impact of contact welding on the size of the contact, when the contact volume becomes 315929 27 1242221, the heat capacity will increase accordingly, so the contact is not easy to melt and the probability of welding will decrease. In addition, when the contact area becomes larger, the amount of increase will also disperse the arc generating points, so the degree of melting of the surface of the contact can be delayed, and the probability of occurrence of welding is reduced. / Here, when the control circuit shown in Figs. 34 to 36 is applied, the first opening and closing device i 1o is less likely to be welded than the second opening and closing device under any circumstances. Therefore, the i opening and closing device 11 〇 It is not necessary to use the same contacts as those in the second opening and closing device 120. Therefore, it is possible to reduce the contact that is not easy to weld (reducing the volume of the contact, reducing the diameter of the contact, or reducing the thickness of the joint, etc.) to reduce the cost, or to increase the contact that is prone to fusion (enlarge the joint) Point volume, increase contact diameter, or increase contact thickness, etc.) to increase safety. For example, the contact of the second opening and closing device 11 is set to a contact diameter of 4.3 mm and the thickness of the contact is 0 mm, and the contact of the second opening and closing device 120 is set to a contact diameter of 4 5 mm. The thickness of the contact is 1.2mm, so that the i-th opening and closing device no can reduce the cost; the "opening-closing device 120" can ensure safety. Also, in the first! Between the second opening and closing device 110 and 120, the difference between the size of the set connection point and the difference is not easy to be connected! For the contacts of the opening and closing device i 11〇 (that is, “one or two tasks without closed circuit or none of the tasks” is mainly used for energizing contacts), AglOO with lower melting point and lower resistance can be used. /. The contact is used to suppress the temperature rise. On the second open / closed contact which is easy to be welded, an eight-zero contact with good blocking performance can be used to ensure completeness. In addition, in order to stagger the sequence of the closed circuit 315929 28 1242221 or the open circuit of the second opening and closing device 11 and 12, as a solution, although the control circuits shown in Figure 33 to Figure 6 have been shown, the closed or The timing of the open hand is limited by this. In the above description, the electrical device is used to stagger the first and second opening and closing times: the closed or open timing of 11G and 12G is set, but mechanical devices can also be used to stagger the timing.

For example, the gaps between the movable iron cores M and 28 of the second opening and closing device 11 and 12 and the fixed iron cores 19 and 29 are set to be the same, and the normally open movable contacts 11 &, 111 >, and 21 211) There is a gap between the contacts of the fixed contacts 12 cores 303, 22 & 30b. In this way, the opening and closing device with a large gap between the contacts will maintain a closed circuit mode later. In addition, because

The gap between the cores of the ^ th opening and closing devices 110 and 120 is the same. Therefore, the overtravel amount of the opening and closing device with a large gap between the contacts will be smaller than the overtravel amount of the opening and closing device with a small gap between the contacts. The opening / closing device with a large gap between the contacts will maintain the leading open circuit mode. Therefore, the opening and closing device with a small gap between the contacts will not generate an arc regardless of whether it is closed or open. Therefore, the contact will not consume the contact except for mechanical wear, and the wear of the contact is smaller than the contact. The contact wear of the opening and closing device with a large gap can reduce the possibility of simultaneous welding of the first and second opening and closing devices 110 and 120. Even when the opening and closing device with a large gap between the contacts is welded, it can be used by The opening and closing device with a small gap between the contacts opens the main circuit, so the safety is high. In addition, by setting the suction difference of the first and second electromagnetic actuators 17a and 27A, the difference of the suction speed of the movable iron cores 18 and 28, and the difference of the friction coefficient of the sliding portions of the cross bars 13, 23, Reset impeachment 315929 29 1242221

The 14 n 24 bow single six-pack december L knife 1 temple method is used to stagger the closed or open timing of the first and second opening and closing devices 11 and 12. The best form of the Shidi system and Ming Guanshi invention, but the present invention is also suitable for the use of a contact switch with a normally closed movable contact in the throwing road. In addition, in addition to the 3-pole, the main bypass can also be 2-pole or 4-pole or more. (Industrial availability) The contact switch of the present invention can be applied to the three-phase AC main circuit opening and closing. In particular, the contact switch can be borrowed ~ Enter σ = flat to meet all female countermeasures in accordance with standards such as ISO13849-1 (JIS9705-l). [Brief description of the drawings] FIG. 1 is an external view of the contact switch 100 of the present invention, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a top view of FIG. FIG. 5 is a perspective view of the front side, FIG. 5 is a perspective view of the back side of FIG. 4, and FIG. 6 is a perspective view of the cover 2 and the box body removed. FIG. The layout of the movable contacts seen from the back side, Fig. 8 is a cross-sectional view formed by the line A_A in Fig. I, and Fig. 9 is the first! Sectional view formed by the line B_B in the figure, FIG. 10 is a contact switch in a state where the cover 2 is removed] 〇〇 Squint 315929 30 I24222l Figure π is a mode of the main circuit of the contact switch i00 Fig. 12 is a schematic diagram of the same auxiliary circuit, Fig. 13 is a perspective view of the back of the cover 2, and Fig. 14 is a perspective view of the black shutter connected with the cover 2 and the terminal screw 16 removed, Figure 15 is a bottom view of the same figure, Figure 16 is an enlarged view of Part 2 (External Connection Terminals) of Figure 15 and Figure 17 is the removal of the cover 2, the terminal screw 16 and the normally open movable contact 11 The front view of the contact shutter 100 in the state of 21, 21, FIG. 18 is an oblique view of the same lower side, FIG. 18 is an enlarged view of part X (fixed contact insertion part) of FIG. 18, and FIG. 20 is a view 17 is a cross-sectional view formed by the CC line (relay contact cross-sectional view), FIG. 21 is a cross-sectional view formed by the D_D line in FIG. 17, FIG. 22 is a perspective view of the spring seat 32a and 32b, and FIG. 23 is a The side view of FIG. 22 is a perspective view in a state where the fixed contacts 12, 22 and the side head 30 are removed from the state of FIG. The figure is an enlarged front view of the central part of the cabinet 1, FIG. 26 is a perspective view of the relay contact 30, FIG. 27 is a front view of FIG. 26, FIG. 28 is a side view of FIG. 26, and FIG. 29 is a Bottom view of Figure 26, Figure 30 is a perspective view of a modified example of the relay contact, 31 315929 1242221 Figure 3! The contact switch 100 is decomposed into the side and the side of the installation station Rishou Phase 1 side The internal perspective view of FIG. 32 is an internal perspective view of the three sides of the women's clothing table, and FIG. 33 is a control circuit diagram of the first embodiment of the contact switch 100, and FIG. 34 shows the contact switch 1 The control circuit of the second embodiment of the 〇00th diagram is a control circuit diagram of the third embodiment of the display of the non-contact switch, and the third diagram of the control circuit of the third embodiment is the fourth embodiment of the display of the non-contact switch operation. Control road map. [Description of main component symbols]

1x, lhd, 2za, 2zb, 3z, iza, izb, 30dm, 30dn 2 Cover 3 Mounting table 3za > 3zb fixing hook 5 Pressed spring switch full wave rectifier 10a, 10b Coil connection terminal lh, Ira , Lrb pedestal 3w, 4z groove protrusion 31x, 31y, 31z mounting screw 3Ha, 3Hb mounting hole 4 movable hook 6 relay 7 capacitor 9a, 9b arc grid 11, 21 normally open movable contact

11a First normally open movable contact 11b Second normally open movable contact 32 315929 1242221 12, 51 First fixed contact 12a, 22a, 30a, 30b, 40a, 40b, 51a, 13 First cross rod 14, 24 15 ^ 25, 71, 72 contact springs 16, 20a, 20b, 26, 61, 62 terminal screws 17, 27 coil 17A 18 ^ 28 movable iron core 19, 29 21a, 21b normally open movable contact Π, 52 23 2nd Cross rod 23w 27A 2nd electromagnetic actuator 30, 40 Relay contacts 32a, 32b, 32d Inclined surface 41 41a First normally closed movable contact 41b Second normally closed movable contact 42 Second normally closed movable contact 42a 4 normally closed movable contact 42b third normally closed movable contact 100 contact switch 110 120 second opening and closing device 52a fixed contact return spring first electromagnetic action Pei fixed iron core second fixed contact square window hole 81, 82 Spring seat, first normally closed movable contact · Lu first opening and closing device 315929 33

Claims (1)

1242221 X. Scope of patent application: h — a kind of contact opening and closing device, which is provided with the majority of the first and second movable contacts housed in the frame: 〖closed clothes, with: two ends of the first contact The head, and the fine moving contacts that hold the activity; and the majority of the contacts supporting the activity are impeached and the number of the first electromagnetic actuators of the majority of the 1 active contacts are simultaneously housed in a frame. The second beta set inside, touches the master, touches the activity to hold it, and supports the activity ... The active contacts simultaneously act as == the second electromagnetic actuator that causes the majority to move; the first several 1. The second fixed contact, the first, the fourth, the first, and the fourth movable contacts are in contact with each other, and do not make contact with the solid contacts, and the other ends are formed outside. P connection terminal, and D is determined in the aforementioned frame; and a plurality of relay contacts, one end and right a a solid contact of contact and separation: the second movable contact contact ^ The end has a connection with the aforementioned first 2 movable contact Point 2 contacts and separate fixed contacts, and is fixed in the frame. The contact switch of item 1 of the scope of patent application, wherein the movable contact of the aforementioned No. 2 brother is a normally open movable contact. 315929 34 1 · If the contact switch of item 1 of the scope of patent application, the above-mentioned "moving contact and the first", the second fixed contact and the relay contact are linearly arranged in the frame 2. As for the contact switch of the scope of application for item No.!, Wherein the aforementioned frame system is composed of: a mounting table for receiving the i-th and second electromagnetic actuators; and a first and second movable contacts and a first! The second fixed contact opening and the 1242221 relay contact cover the box of the mounting platform. 5. For the contact switch of item 4 of the patent application scope, a mounting groove is provided in the aforementioned mounting platform. Or at least one of the mounting holes. 6. In the case of the contact opening / closing device according to item 4 of the patent application scope, an opening is provided on the front side of the case, and a cover covering the opening is installed. 7 . = The contact switch of item 6 of the scope of patent application, in which the aforementioned second movable contact 'is pressed against the peripheral part of the contact surface with the movable contact provided with an inclined surface or an arc portion. Spring seat, and by the aforementioned i and 2 electromagnetic actuators Support and support the building at a position closer to the cover than the above-mentioned 、 ι and second fixed contacts. 8. For example, the above-mentioned contact switch of the scope of patent application 'Among them, most of the aforementioned first and second movable contacts One of the heads is a normally-closed movable contact, and the other is a suspended movable contact. The contact of the normally-open movable contact is in contact with or dazzled with the contact of the fixed contact and the relay contact. At this time, the circuit containing the aforementioned normally closed movable contact will form an open state with a gap between the contacts above a predetermined value. 9. For example, the contact switch of item 6 of the patent application scope is in the aforementioned box. A base with a pair of grooves is formed at the slightly central portion of the bracket, and a pair of protrusions formed on the relay contact are fitted into the pair of grooves. W · As for the patent _ item 9 contact switch The relay contact is sandwiched and fixed between the pedestal and the protrusion provided on the cover. U. The contact opening and closing device according to item 1 of the patent application scope, wherein 2 Movable contacts and fixed contacts in contact with and separated from them, as described in 315929 35 1242221. The size of the third and fourth movable contacts and the fixed contacts that are in contact with and separated from each other is different between the movable contact and the fixed contact. At least one of them is different. According to the item of the contact opening and closing device, between the aforementioned first and second movable contacts and the fixed contacts in contact with and separated therefrom, and the aforementioned third and fourth movable contacts and the fixed contacts in contact with and separated therefrom, The material of at least one of the movable contact and the fixed contact is different. 13. For example, the contact switch of the first scope of the patent application, wherein the aforementioned second and second electromagnetic actuators are in the aforementioned frame. The body is connected in parallel and driven by inputting the same control signal. ‘14. For example, the contact switch of item 1 of the scope of patent application, wherein the aforementioned No. 2. The second opening and closing device is provided with a time difference in the closed circuit sequence, and is always closed in the same sequence. 15. The contact opening / closing device of item i in the patent application range, wherein the aforementioned second opening / closing arrangement is to set a time difference in the sequence of the open circuit and always call for an open circuit in the same order. 16. If the scope of patent application is the first! The contact opening and closing device of this item is the time when the first and second opening and closing devices are respectively set in the closed circuit and the opening sequence], so that the opening and closing device that is closed first can be opened later, and the opening and closing device that is closed first and then opened is released. Closed circuit and open circuit tasks. 17. For example, the opening and closing H of the contact No. 16 in the scope of patent application of the patent, in which the above-mentioned opening and closing device without a closed circuit task and an open circuit task are not provided with arc extinguishing parts. 315929 36