CN108695081B

CN108695081B - Three-station opening and closing operation device and three-station opening and closing device

Info

Publication number: CN108695081B
Application number: CN201710220717.0A
Authority: CN
Inventors: 王成祎; 朱治才; 赵贺龙
Original assignee: Eaton Electrical Equipment Co Ltd
Current assignee: Eaton Electrical Equipment Co Ltd
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2022-07-12
Anticipated expiration: 2037-04-06
Also published as: CN108695081A

Abstract

The invention relates to a three-station opening and closing operation device and a three-station opening and closing device. Three stations are including keeping apart the station, putting through station and ground connection station, three station divide-shut brake operating means include the fixing base, still include: an operating handle; a transmission mechanism mounted on the fixed base and having a movable contact connection end, the transmission mechanism being operatively connected to the operating handle; and an energy storage mechanism coupled to the transmission mechanism and having a spring, the energy storage mechanism being mounted such that the spring has a maximum amount of compression at the isolation station and applies at least a portion of the stored energy to the movable contact connection terminals through the transmission mechanism only during a ground closing operation.

Description

Three-station opening and closing operation device and three-station opening and closing device

Technical Field

The invention relates to the technical field of switch cabinets, in particular to a three-position opening and closing operation device and a three-position opening and closing device for implementing switching-on and closing operations and grounding switching-on operations in a switch cabinet.

Background

In a switch cabinet, in particular to a solid insulation switch cabinet, a three-position opening and closing mechanism is a key mechanism of the switch cabinet. The existing three-station switching-on and switching-off mechanism is roughly divided into two types, namely slow motion and fast motion. The isolation-connection and isolation-grounding state conversion of the slow-motion three-station switching-closing mechanism is completed by manual operation, the switching-on speed is low, the distribution of the mechanisms is scattered, and the switching-on and switching-off capability of grounding short circuit faults is not provided. The isolation-connection and isolation-grounding state conversion of the quick-acting three-station switching-on and switching-off mechanism is quickly completed by means of an energy storage structure, the structure is complex, the fault rate is high, and great hidden dangers exist in the operation reliability.

Therefore, there is a need in the industry to improve the switching mechanism to simplify the structure and improve the safety.

Disclosure of Invention

The invention aims to provide a three-station opening and closing operation device which can at least solve part of technical problems.

The invention also aims to provide a three-position opening and closing device applying the improved three-position opening and closing operation device.

According to one aspect of the invention, a three-station opening and closing operation device is provided, the three stations include an isolation station, a connection station and a grounding station, the three-station opening and closing operation device includes a fixed seat, and the three-station opening and closing operation device is characterized by further comprising: an operating handle; a transmission mechanism mounted on the fixed base and having a movable contact connection end, the transmission mechanism being operatively connected to the operating handle; and an energy storage mechanism coupled to the transmission mechanism and having a spring, the energy storage mechanism being mounted such that the spring has a maximum amount of compression at the isolation station and applies at least a portion of the stored energy through the transmission mechanism to the movable contact connection only during a ground closing operation.

The three-position opening and closing mechanism has three positions of isolation, connection and grounding. The spring is initially installed in a compressed configuration and the amount of compression is greatest in the isolated position. The switching from the isolation position to the connection position is a switching-on switching operation, namely slow-motion (quick) switching, namely, only manual force application is carried out during switching-on, and the compressed spring does not act on the transmission mechanism (or a movable contact connected with the transmission mechanism). The operation from the isolation position to the grounding position is converted into the grounding closing operation, namely the quick-action (quick) closing operation, namely after the spring compressed by the operation handle is operated to cross a dead point position, the spring is released, so that at least one part of the energy stored by the spring is released to the connecting end of the moving contact through the transmission mechanism, namely the energy acts on the moving contact. The moving contact is switched on rapidly at a speed much faster than that of slow-motion switching-on under the action of the spring, so that the three-station switching-on and switching-off device has the capability of rapidly switching on and off in the case of grounding short circuit faults. The three-station opening and closing operation device is designed to be in a slow-motion closing connection and fast-motion grounding closing mode, so that the structure of the three-station opening and closing device can be effectively simplified, the number of parts can be reduced, and the running reliability of the device can be improved.

According to a preferred embodiment, the transmission mechanism comprises: the gear transmission mechanism is arranged on the fixed seat, and the operating handle is in driving connection with the gear transmission mechanism; and a linkage mechanism drivingly connected by the gear transmission mechanism and in operable engagement with the stored energy mechanism. In this way a simple transmission mechanism is provided.

Preferably, the gear transmission mechanism includes: the first rotating shaft is arranged on the fixed seat and is detachably connected with the operating handle; a first helical gear mounted on the first rotating shaft; the second rotating shaft is arranged on the fixed seat along the direction vertical to the first rotating shaft and is relatively and fixedly arranged with the first rotating shaft; and a second bevel gear installed on the second rotating shaft and engaged with the first bevel gear; wherein the link mechanism is mounted on the second rotating shaft. Thus, the simple gear transmission mechanism is provided, wherein the rotating shafts of the two mounting bevel gears are arranged in the vertical direction, the space conversion of transmission can be realized, the transmission space is saved, and the transmission efficiency is improved.

Preferably, the link mechanism includes: the crank arm is arranged in a manner that the crank arm swings along a first direction during the switching-on and switching-off operation and the curved surface exerts force for swinging the spring on the spring, and the crank arm accommodates the energy storage mechanism and is pushed by the energy storage mechanism to swing along a second direction during the grounding and switching-off operation; and the connecting rod is hinged to the crank arm, and the moving contact connecting end is formed on the connecting rod.

By means of this linkage mechanism, during a switch-on closing operation, the lever is driven by the gear train to swing in a first direction, the curved surface of the lever supporting the energy storage means (e.g. its energy storage shaft) and swinging the spring. The compression state of the spring is kept unchanged (namely the maximum compression amount is kept) in the switching-on and switching-off operation process, so that the energy storage mechanism is only pressed on the outward-protruding curved surface of the crank arm, and the switching-on and switching-off operation is only completed manually (slowly). At the moment, the compression-jointed energy storage mechanism provides certain pressure for keeping the on-off state. During the operation of grounding and closing, the crank arm swings in a second direction opposite to the first direction under the drive of the gear transmission mechanism, the energy storage mechanism (such as an energy storage shaft) falling in the clamping groove of the crank arm moves along with the crank arm, and after the spring swings beyond a dead point position, the compressed spring is released, so that the energy storage mechanism pushes the crank arm to swing rapidly in the second direction, and at least one part of the energy stored by the compressed spring is released to a static contact through the transmission mechanism, thereby rapidly completing the grounding and closing.

Preferably, the energy storage mechanism comprises: the bracket is provided with a vertical plate which is arranged on the fixed seat and is provided with a curve groove and a baffle plate which is arranged on the vertical plate; a spring axle received in the curved slot and supported on the crank arm, the spring axle being movable along a path defined by the curved slot; the spring is mounted between the spring shaft and the baffle of the bracket.

During a closing operation, the curved surface of the crank arm pushes the spring shaft of the energy storage mechanism to move generally upward in the curved slot. During the grounding closing operation, the spring shaft is placed in the clamping groove of the crank arm, and moves downwards along the curve groove and pushes the crank arm to swing. The shape of the curved groove is reasonably designed to limit the required motion track of the spring shaft.

Preferably, the energy storage mechanism further comprises a guide structure, the guide structure comprising: one end of the guide rod is connected to the spring shaft, the other end of the guide rod extends towards the baffle, and the guide rod limits a sliding groove; and a stop member slidably mounted in said chute and in stop-fit engagement with said baffle of said bracket; the spring is sleeved on the guide rod and abuts against the stop part. This provides a guide structure of simple construction.

Preferably, a side of the baffle facing the spring shaft is formed with a pocket, and the stopper is located in the pocket and defines an arc surface protruding toward a bottom of the pocket. The cambered surface is tangent to the bottom of the containing groove so as to define the swing center of the spring.

Preferably, the operating device further comprises a limiting structure mounted on the fixed seat, the limiting structure defines two convex parts which form stop matching with the crank arm, and the two convex parts respectively define the end points of the crank arm swinging along the first direction and the second direction. Therefore, a simple limiting structure is provided, and the fault of the opening and closing device caused by the overlarge motion amplitude of the crank arm is avoided.

Preferably, the transmission mechanism further comprises: a first straight gear installed on the first rotating shaft; the third rotating shaft is arranged on the fixed seat along the direction parallel to the first rotating shaft and is relatively and fixedly arranged with the first rotating shaft; and a second spur gear installed on the third rotation shaft; wherein the operating handle is suitable for being selectively in driving connection with the first rotating shaft or the third rotating shaft. The operating handle is selectively connected with the first rotating shaft or the second rotating shaft, so that fast switch-on (grounding) fast-acting switch-on or slow switch-on (switching-on) slow-acting switch-on is respectively realized.

Preferably, the mobile terminal further comprises a pivot limiting member, wherein the pivot limiting member comprises: the connecting plate is sleeved on the first rotating shaft and the second rotating shaft; and two pivot limiting parts which are respectively corresponding to the first rotating shaft and the second rotating shaft and are installed on the connecting plate, wherein the two pivot limiting parts respectively comprise bosses extending around the peripheries of the corresponding rotating shafts and notches formed on the bosses, the notches limit the rotating range of the corresponding rotating shafts, and the notches of the two pivot limiting parts are arranged in a staggered manner.

Preferably, the operating handle includes: the transmission rod is detachably connected with the first rotating shaft or the third rotating shaft and is provided with a protrusion which is suitable for being accommodated in the notch of the boss and forms stop fit with the boss; and an operating lever mounted on the driving lever and having an operating end protruding out of the driving lever.

Preferably, the driving lever includes: an inner rod adapted to be detachably connected to the first and third rotating shafts, the inner rod having a circumferentially extending elongated slot, the protrusion being formed on an outer circumferential surface of the inner rod; a sleeve connected to the inner rod by a pin passing through the elongated slot and the sleeve itself. The long groove on the inner rod enables the inner rod and the sleeve which are connected by the pin to form a relative rotating idle stroke. During the grounding switching-on operation, the moving contact is rapidly switched on by the huge energy released by the spring, and the acting force can be applied to the moving contact and an operating handle through a gear transmission mechanism to cause the inner rod to rapidly rotate. At the moment, due to the existence of the long groove, the outer sleeve cannot rotate rapidly along with the long groove, even cannot rotate basically, and therefore impact on workers holding the operating rod is avoided.

According to another aspect of the present invention, there is provided a three-position opening and closing apparatus, including: a first fixed contact; a second fixed contact; the moving contact can be selectively jointed with the first fixed contact or the second fixed contact to form a switch-on and switch-off state or a grounding and switch-on state; the switching-on and switching-off device further comprises the three-station switching-on and switching-off operating device, wherein the moving contact connecting end of the transmission mechanism is hinged with the moving contact.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.

Drawings

Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a schematic view of a switching-on/off device according to an embodiment of the present invention;

FIG. 2 is a schematic view of an operating device according to an embodiment of the present invention, with the linkage and operating handle omitted;

FIG. 3 is a partial schematic view of an operating device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a crank arm according to an embodiment of the present invention;

FIG. 5 is a schematic view of a baffle according to an embodiment of the invention;

FIG. 6 is a schematic illustration of a crank arm swinging in a first direction into engagement with one of the lobes in accordance with an embodiment of the present invention;

FIG. 7 is a schematic illustration of a crank arm swinging in a second direction into engagement with another lobe according to an embodiment of the present invention;

FIG. 8 is a schematic view of a spring shaft according to an embodiment of the present invention;

FIG. 9 is a schematic view of a guide structure in cooperation with a spring according to an embodiment of the present invention;

FIG. 10 is a schematic view of an operating handle engaged with a transmission according to an embodiment of the present invention;

FIG. 11 is a schematic view of an operating handle according to an embodiment of the present invention;

fig. 12 is a schematic view of a pivot limiter according to an embodiment of the present invention;

fig. 13 is a schematic view of a switching-closing device according to an embodiment of the present invention in an isolated state;

fig. 14 is a schematic view during an isolation-on operation of the opening and closing apparatus according to the embodiment of the present invention;

fig. 15 is a schematic view of the opening and closing apparatus according to the embodiment of the present invention in the on state;

fig. 16 is a schematic view of a switching-closing device according to an embodiment of the present invention in an isolated state;

fig. 17 is a schematic view during an isolation-ground operation of the opening and closing apparatus according to the embodiment of the present invention; and

Fig. 18 is a schematic diagram of the opening and closing device in a grounded state according to the embodiment of the present invention.

In the present invention, the same or similar reference numerals denote the same or similar features.

Description of reference numerals:

1. first static contact 2 and second static contact

3. Moving contact 4. three-station opening and closing operation device

5. Operating handle 51, operating rod

52. Driving rod 521, sleeve

522. Inner rod 523. long groove

524. Projection 53 pin

6. Driving mechanism 61, gear driving mechanism

611. First shaft 612. first bevel gear

613. First straight gear 614, second rotating shaft

615. Second bevel gear 616, third shaft

617. Second spur gear 62. link mechanism

63. Crank arm 631 and clamping groove

632. Curved surface 633 stop surface

634. Stop groove 635 opening

64. Connecting rod 641 moving contact connecting end

7. Energy storage mechanism 71. spring shaft

711. Limiting structure 712 cushion block

713. Bearing 714. engaging groove

72. Bracket 721, curved groove

722. Baffle 723. first arc segment

724. Second arc segment 725, open

726. Containing groove 73. spring

74. Guide structure 741 guide rod

742. Chute 75 stop piece

751. Cambered surface 8-limiting structure

81. First projection 82, second projection

83. First hole 84, second hole

9. Pivot

position limiter

91, 92 pivot position limiter

911. 921.

bosses

912, 922 notches

93. Connecting plate 10, support

Detailed Description

Referring now to the drawings, schematic schemes of the disclosed three-position opening and closing operation device and the three-position opening and closing device will be described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Referring to fig. 1, a three-position opening and closing device according to an embodiment of the present invention is shown, which is applied to a switchgear, for example. The three-position switching-on/off device as a whole is preferably mounted on a fixed seat, for example, in a fixed housing. The three-station opening and closing device comprises a first fixed contact 1, a second fixed contact 2, a movable contact 3 and a three-station opening and closing operation device 4. The moving contact 3 can pivot around a fixed axis so as to be connected with the first fixed contact 1 or the second fixed contact 2 under the control of the operating device 4, and the switching-on and switching-off operation or the grounding switching-on operation is completed. Here "three-station" has the meaning known to the person skilled in the art, namely the isolating station, the switch-on station and the grounding station. Wherein figure 1 shows the switching-on and switching-off device in an isolated position.

Referring to fig. 2 to 12 in combination, one embodiment of the three-position opening and closing operation device 4 is shown. In the illustrated embodiment, the three-position opening and closing operation device 4 includes an operation handle 5, a transmission mechanism 6 and an energy storage mechanism 7. As shown in fig. 2, one embodiment of the transmission mechanism 6 is shown. In the embodiment shown, the transmission 6 comprises a gear transmission 61 and a linkage 62. The gear rotating mechanism 61 includes a first rotating shaft 611 mounted on the bracket 10, which is, for example, a part of the fixed base, a first spur gear 613 and a first helical gear 612 mounted on the first rotating shaft 611, a second rotating shaft 614 (refer to fig. 3) arranged perpendicularly to the first rotating shaft 611, a second helical gear 615 mounted on the second rotating shaft 614 and engaged with the first helical gear 612, a third rotating shaft 616 mounted on the bracket 10 and arranged in parallel with the first rotating shaft 611, and a second spur gear 617 mounted on the third rotating shaft 616 and engaged with the first spur gear 613. Although a gear transmission mechanism is used here, those skilled in the art can conceive of applying other transmission mechanisms, such as a worm gear transmission mechanism, a rack and pinion transmission mechanism, etc., to realize the transmission of the force from the operating handle 5 to the movable contact 3, which all fall within the protection scope of the present invention.

The operating handle 5 may be selectively connected to the first rotating shaft 611 or the third rotating shaft 616 according to the on-closing or ground-closing requirement and pivoted by a manual operation. In the illustrated embodiment, the first rotating shaft 611 is used for a ground closing operation, and the third rotating shaft 616 is used for a turn-on closing operation. However, it will be understood by those skilled in the art that the first rotating shaft may be used for switching on and switching off, and the third rotating shaft may be used for switching on and switching off, or only one shaft may be used to pivot in different directions and limit the pivoting angle in each direction to realize switching on and switching off.

The pivoting of the first rotating shaft 611 or the third rotating shaft 616 can drive the second rotating shaft 614 to pivot through a series of transmission members in between, such as a spur gear, a helical gear as shown. Preferably, the first rotating shaft 611, the second rotating shaft 614 and the third rotating shaft 616 can only pivot around their respective central axes, but cannot move radially or axially, so as to ensure stability of the operation between the respective gears engaged with each other. For example, the fixing base is provided with a limiting structure 8, the limiting structure 8 has a first hole 83 and a second hole 84, wherein the first rotating shaft 611 passes through the first hole 83, and the second rotating shaft 614 passes through the second hole 84, so as to limit the spatial displacement of the two shafts. It is also possible to limit the radial movement of the first rotating shaft 611 by, for example, forming a circumferential groove in the first rotating shaft 611 and engaging a portion of the limiting structure 8 in the circumferential groove. Other structures which can limit the movement of each rotating shaft can be a key slot structure and the like. By these restricting structures, the positions of the three

rotating shafts

611, 614, 616 are relatively fixed.

In the illustrated embodiment, the linkage 62 includes a crank arm 63 and a link 64. Referring to fig. 2 and 4, the crank arm 63 is mounted on the second rotating shaft 614 through the opening 635 and driven to swing by the second rotating shaft 614. The outer peripheral profile of the crank arm 63 is formed with a catching groove 631 and a curved surface 632 for cooperation with an energy storage mechanism 7 which will be described later in detail. A first end of the connecting rod 64 is hinged to the crank arm 63, and a second end of the connecting rod 64 is hinged to the movable contact 3 as a movable contact connecting end 641.

The three-position opening and closing operation device 4 is further provided with a limiting structure for limiting the swing range of the crank arm 63, such as a first protrusion 81 and a second protrusion 82 formed on the limiting structure 8. Which are adapted to form a stop fit with stop surface 633 and stop recess 634 of crank arm 63, respectively. As shown in fig. 6, when the crank arm 63 swinging in the first direction moves until its stop surface 633 engages with the first protrusion 81, the crank arm 63 stops moving. With continued reference to fig. 7, when the crank arm 63 is swung in a second direction opposite the first direction until its stop recess 634 engages the second boss 82, the crank arm 63 stops moving.

Referring to fig. 2, 8 and 9, an embodiment of the energy storage mechanism 7 is shown. The energy storage mechanism 7 includes a spring shaft 71, a bracket 72, a spring 73, and a guide structure 74. The bracket 72 is mounted on the fixed base and comprises two vertical plates 727 which are oppositely arranged and a baffle 722 connected between the vertical plates 727. Each vertical plate 727 is provided with a curved slot 721, and the curved slot 721 is formed by connecting two arc sections with different radiuses, namely a first arc section 723 with a smaller radius and a second arc section 724 with a larger radius. Wherein the first circular arc section 723 corresponds to a turn-on closing operation and the second circular arc section 724 corresponds to a ground closing operation.

The spring shaft 71 is supported by the crank arm 63 via bearings 713 at both ends thereof, for example, and is inserted into the curved groove 721. The bearing 713 may be effective to reduce friction between the spring axle 71 and the crank arm 63. The spring shaft 71 may move along a path defined by the curved slot 721. To prevent the spring shaft 71 from being displaced, a stopper 711 on which an engagement groove 714 is defined is mounted on the spring shaft 71. Referring to fig. 8, the side wall of the curved slot 721 is fitted into the engagement slot 714 to prevent the spring shaft 71 from being axially displaced by the stopper engagement between the side wall of the engagement slot 714 and the side wall of the curved slot 721.

In the illustrated embodiment, the guide structure 74 is mounted on the spring axle 71 and is restrained from movement by a spacer 712 on the spring axle 71. As shown in fig. 9, the guiding structure 74 includes a guide rod 741 having one end mounted on the spring shaft 71 and the other end extending toward the stopper 722 and passing through the opening 725 of the stopper 722, wherein the guide rod 741 has a chute 742 formed therein. The stopper 75 is accommodated in the chute 742 and is movable along the chute 742. The spring 73 is fitted over the guide rod 741 and mounted in a compressed state, and the amount of compression of the spring 73 is maximum at the isolation position. The compressed spring 73 presses the stopper 75 against the underside of the shutter 722. The length of the stopper 75 is greater than the diameter of the aperture 725 of the shield 722. During the movement of the spring shaft 71 along the curved slot 721, the guide rod 741 (together with the spring 73) swings substantially at the contact point of the stopper 75 and the stopper 722.

Referring to fig. 5, it is preferable that a groove 726 is formed at a lower side of the shutter 722, the stopper 75 is seated in the groove 726, and a surface of the stopper 75 contacting a groove bottom of the groove 726 is formed with an arc surface 751. The position where the arc surface 751 is tangent to the bottom of the groove 726 serves as the swing center of the guide rod 741 (together with the spring 73).

Referring to fig. 10 and 11, the operating handle 5 includes an operating lever 51 and a transmission lever 52. The transmission rod 52 is a split structure and includes an inner rod 522 and a sleeve 521. A long groove 523 extending in the circumferential direction is formed in the inner lever 522. The pin 53 passes through the slot 523 and the circular hole of the sleeve 521 to connect the inner rod 522 with the sleeve 521. The operating lever 51 is vertically mounted on the sleeve 521.

Referring to fig. 10 and 12, the pivot stoppers 9 are mounted on the first rotating shaft 611 and the third rotating shaft 616. The pivot limiting member 9 includes a connecting plate 93 sleeved on the first rotating shaft 611 and the third rotating shaft 616, and two

pivot limiting portions

91 and 92 mounted on the connecting plate 93 corresponding to the first rotating shaft 611 and the third rotating shaft 616, respectively. The two

pivot stopper portions

91 and 92 each have a circumferentially

unclosed boss

911 and 921 surrounding the corresponding rotating shaft, and

notches

912 and 922 are formed in the two

bosses

911 and 921, respectively. Accordingly, the outer periphery of the inner lever 522 forms a protrusion 524 that can be placed in the

notches

912, 922 and form a stop fit with the end surfaces of the

bosses

911, 921, so that the operating handle 5 drives the first rotating shaft 611 or the third rotating shaft 616 to pivot within the angle range defined by the

notches

912, 922. As shown in fig. 12, the

notches

912 and 922 of the two

pivot limiting portions

91 and 92 are arranged in a staggered manner, so that the operating handle 5 drives the transmission mechanism 6 to perform different closing operations.

The operation principle of the three-position opening and closing device according to the embodiment of the present invention is described in detail below with reference to fig. 13 to 18.

The principle of the closing and opening operation is shown in fig. 13 to 15.

As shown in fig. 13, the three-position opening and closing device is in the isolated position. At this time, the spring shaft 71 is placed in the locking groove 631 of the crank arm 63, and the spring shaft 71 is located at the intersection position of the two arc sections of the curved groove 721. At this time, the spring 73 is in a state of maximum compression amount and is in a dead point position, so that the whole three-position opening and closing device keeps reliable stability in the isolation position.

As shown in fig. 14, when the third rotating shaft 616 is driven to pivot by the operating handle 5, the gear transmission mechanism 61 transmits the driving force to the crank arm 63, causing the crank arm 63 to swing in the first direction. This action causes the spring axle 71 to disengage from the catch 631 and ride up the curved surface 632 of the crank arm 63. The curved surface 632 drives the spring shaft 71 to move upward along the first arc section 723 of the curved groove 721. During this process, the spring 73 swings and remains compressed, i.e., does not release the stored energy.

As shown in fig. 15, when the crank arm 63 swings in the first direction to be engaged with the first protrusion 81, the crank arm 63 stops moving, and the movable contact 3 is engaged with the first stationary contact 1, at this time, the crank arm 63 is located at a dead point position during passing, so that the risk of the moving contact 3 retreating is effectively avoided.

The slow-motion switching-on and switching-off operation is completed.

And then the third rotating shaft 616 is driven reversely, so that the three-position opening and closing device returns to the isolation position shown in fig. 13, thereby completing the opening and closing operation.

The principle of the ground closing operation is shown in fig. 16 to 18.

As shown in fig. 16, the opening and closing device is in the isolated position. At this time, the spring shaft 71 is placed in the locking groove 631 of the crank arm 63, and the spring shaft 71 is located at the intersection position of the two arc sections of the curved groove 721. At this time, the spring 73 is in a state of maximum compression amount and is in a dead point position, so that the whole three-position opening and closing device keeps reliable stability in the isolation position.

As shown in fig. 17, when the first rotating shaft 613 is driven to pivot by the operating handle 5, the gear transmission mechanism 61 transmits a driving force to the crank arm 63, causing the crank arm 63 to swing in a second direction opposite to the first direction. This action causes the spring shaft 71 to drop along the second circular arc section 724 of the curved slot 721, which swings the spring 73 out of the dead center position. The spring 73 releases its stored energy causing the spring shaft 71 to pivot rapidly in the second direction in the catch 631 pushing against the crank arm 63.

As shown in fig. 18, when the crank arm 63 swings in the second direction to engage with the second protrusion 82, the crank arm 63 stops moving, and the movable contact 3 engages with the second stationary contact 2. The spring 73 may still have a certain amount of compression at this point (less than the aforementioned maximum amount of compression) or may be in an uncompressed state.

The quick-acting grounding switch-on operation is completed.

Then, the first rotating shaft 613 is reversely driven to return the switching device to the isolation position shown in fig. 16, thereby completing the grounding switching-off operation.

It should be understood that although the specification has been described in terms of various embodiments, each embodiment does not necessarily encompass a single embodiment, and such descriptions are merely for clarity purposes and should be construed by those skilled in the art as a whole, and the embodiments may be suitably combined to form other embodiments as will be apparent to those skilled in the art.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention shall fall within the scope of the invention.

Claims

1. The utility model provides a three-station divide-shut brake operating means (4), three stations are including keeping apart station, switch-on station and ground connection station, three-station divide-shut brake operating means (4) include the fixing base, its characterized in that still includes:

an operating handle (5);

-a transmission mechanism (6) mounted on said fixed seat and having a movable contact connection end (641), said transmission mechanism (6) comprising a linkage mechanism (62) and a force transmission mechanism operatively connected to said operating handle (5), wherein said linkage mechanism (62) comprises:

A crank arm (63) which is connected by the force transmission mechanism in a driving manner, wherein the crank arm (63) is provided with a clamping groove (631) and an outward-protruding curved surface (632); and

a connecting rod (64) hinged to the crank arm (63), the movable contact connecting end (641) being formed on the connecting rod (64);

an energy storage mechanism (7) coupled to the transmission mechanism (6) and including:

a spring shaft (71) supported by the crank arm (63);

a spring (73) mounted in a compressed state on the spring shaft (71), the spring (73) having a maximum amount of compression at the isolation station;

wherein the lever arm (63) is mounted such that during a closing operation the lever arm is driven by the force transmission mechanism to swing in a first direction, while the curved surface (632) supports the spring shaft (71) and applies a force to the spring (73) that causes it to swing and remain in a compressed state, while during a closing operation to ground the lever arm is driven by the force transmission mechanism to swing in a second direction opposite to the first direction, while the spring shaft (71) received in the catch groove (631) is urged against the lever arm by the action of the compressed spring being released to continue swinging in the second direction such that at least a portion of the stored energy is applied to the movable contact connection end (641) through the transmission mechanism (6).

2. A three-position switch-on/switch-off operating device (4) according to claim 1, wherein the force transmission mechanism is a gear transmission mechanism (61) which is installed on the fixed seat, and the operating handle (5) is in driving connection with the gear transmission mechanism (61).

3. Three-position opening and closing operating device (4) according to claim 2, wherein said gear transmission (61) comprises:

the first rotating shaft (611) is arranged on the fixed seat and is detachably connected with the operating handle (5);

a first bevel gear (612) mounted on the first rotating shaft (611);

a second rotating shaft (614) which is arranged on the fixed seat along the direction perpendicular to the first rotating shaft (611) and is relatively fixed with the position of the first rotating shaft (611); and

a second helical gear (615) mounted on the second shaft (614) and engaged with the first helical gear (612);

wherein the linkage (62) is mounted on the second shaft (614).

4. Three-position opening and closing operating device (4) according to claim 1, wherein said energy storage means (7) comprise:

a bracket (72) which is provided with a vertical plate (727) which is arranged on the fixed seat and is provided with a curved groove (721) and a baffle plate (722) arranged on the vertical plate (727);

The spring shaft (71) is accommodated in the curved slot (721) and supported on the crank arm (63), and the spring shaft (71) can move along a path defined by the curved slot (721);

the spring (73) is mounted between the spring shaft (71) and the baffle (722) of the bracket (72).

5. Three-position opening and closing operating device (4) according to claim 4, wherein said energy accumulating mechanism (7) further comprises a guide structure (74), said guide structure (74) comprising:

a guide rod (741) having one end connected to the spring shaft (71) and the other end extending in a direction of the stopper (722), the guide rod (741) defining a slide groove (742); and

a stop (75) slidably mounted in said chute (742) and in stop engagement with said baffle (722) of said bracket (72);

the spring (73) is sleeved on the guide rod (741) and abuts against the stop piece (75).

6. Three-position switch-on/switch-off operating device (4) according to claim 5, characterized in that the side of the shutter (722) facing the spring shaft (71) is formed with a pocket (726), the stop (75) being located in the pocket (726) and defining an arc face (751) projecting towards the bottom of the pocket (726).

7. A three-position switch-on/switch-off operating device (4) according to claim 1, further comprising a limiting structure (8) mounted on the fixed seat, wherein the limiting structure (8) defines two convex portions (81,82) forming stop fit with the crank arm (63), and the two convex portions (81,82) respectively define the end points of the swing of the crank arm (63) along the first direction and the second direction.

8. A three-position opening-closing operating device (4) according to claim 3, wherein said gear transmission mechanism (61) further comprises:

a first straight gear (613) mounted on the first rotating shaft (611);

a third rotating shaft (616) which is fixedly arranged on the fixed seat along the direction parallel to the first rotating shaft (611) and opposite to the position of the first rotating shaft (611); and

a second spur gear (617) mounted on the third rotation shaft (616);

wherein the operating handle (5) is adapted to be selectively in driving connection with the first rotating shaft (611) or the third rotating shaft (616).

9. The three-position closing and opening operating device (4) according to claim 8, further comprising a pivot limiting member (9), wherein the pivot limiting member (9) comprises:

A connecting plate (93) sleeved on the first rotating shaft (611) and the second rotating shaft (614); and

two pivot limiting portions (91,92) mounted on the connecting plate (93) corresponding to the first rotating shaft (611) and the second rotating shaft (614), respectively, each of the two pivot limiting portions (91,92) including a boss (911,921) extending around the periphery of the corresponding rotating shaft and a notch (912,922) formed on the boss (911,921), the notches (912,922) defining the rotation range of the corresponding rotating shaft, the notches (912,922) of the two pivot limiting portions (91,92) being arranged in a staggered manner.

10. Three-position opening-closing brake operating device (4) according to claim 9, wherein the operating handle (5) comprises:

a drive rod (52) detachably connected to the first or third shaft (611, 616), the drive rod (52) having a protrusion (524) adapted to be received in the notch (912,922) of the boss (911,921) and form a stop fit with the boss (911, 921); and

an operating lever (51) mounted on the transmission lever (52) and having an operating end projecting out of the transmission lever (52).

11. Three-position closing and opening operating device (4) according to claim 10, wherein said transmission lever (52) comprises:

An inner rod (522) adapted to be detachably coupled to the first and third shafts (611, 616), the inner rod (522) having a circumferentially extending elongated slot (523), the protrusion (524) being formed on an outer circumferential surface of the inner rod (522);

a sleeve (521) connected to the inner rod (522) by a pin (53) passing through the long groove (523) and the sleeve (521).

12. A three-station opening and closing device comprises:

a first stationary contact (1);

a second stationary contact (2);

a movable contact (3) capable of being selectively engaged with the first fixed contact (1) or the second fixed contact (2) to form a switch-on/switch-off state or a ground switch-on state;

characterized in that the switching-on/off device further comprises a three-position switching-on/off operating device (4) as claimed in any one of claims 1 to 11, wherein the moving contact connecting end (641) of the transmission mechanism (6) is hinged with the moving contact (3).