A kind of main shaft limiting device
The invention belongs to low-voltage electrical apparatus component equipment technical fields, and in particular to a kind of main shaft limit of low-voltage circuit breaker
Frame-type circuit breaker is resistant to index in short-term and is constantly being promoted in the case where breaker constancy of volume at present, increases
Adding contact pressure is a kind of than relatively straightforward method.But this method bring side effect is exactly moving contact in separating brake, and mechanism is outstanding
Arm hit limit shaft power become larger, aggravation contact spring back and reduce out away from.In disjunction test, reduction is opened away from easily causing electric arc
It restrikes, disjunction is caused to fail.
Main shaft limit currently on the market is to realize that mechanism main axis speed has one when to separating brake using the principle of inertia
Fixed requirement, poor reliability.And easily there is limit plate skew, rotation after multiple impact in the limit plate wherein to play a crucial role
Not flexible, limit plate rotation shaft distortion, torsional spring suppress the phenomena of the failure such as stuck.
Application No. is the patent applications of 201710149068.X to disclose a kind of moving contact of breaker resilience-proof device, including
Breaker body, the mechanism main shaft being arranged on breaker body and anti-rebound mechanism, the second limit shaft are arranged in fixing axle
Lower section, the swivel plate by impact portion, blocking portion and mounting hole by being formed, the cross section shape of the outer surface of the blocking portion
Shape is set as convex structure, and the contour structure of arc-shaped from lower end to upper end with the distance between the mounting hole center of circle gradually
Reducing, the swivel plate is rotatably installed in fixing axle by mounting hole, and the torsional spring is socketed in fixing axle, and torsional spring
Two torque arm are respectively acting on the second limit shaft and swivel plate.But the resilient mounting is complicated, needs multiple component joint works
Make, and anti-rebound ineffective, influences limit effect.
The breaker that can prevent tripping contact arm from springing back with automatic catch application No. is 98122539.X is to pass through latch
Hook 89 navigates to the device 101 in cocked position, makes described two jaws 93 alignment to engage with described stop part 75, when described
When contact arm 27 reaches described TRIPPED position, described latch hook 89 just turns to described latch position from described cocked position,
When described jaw 93 engaged with described stop part 75, so as to preventing described contact arm 27 from springing back from described TRIPPED position.In fact
It applies in example, the device 101 in cocked position is torque spring 101.Its specification the third line of page 6/6: as shown in figure 4, have one with
The torque spring 101 that protrusion 99 on the top of contact arm 27 and a latch hook engages can be such that latch hook resets in angle
One cocked position, two jaws 93 are aligned to engage with stop part 75 on the position.As it can be seen that although the patent realizes
The technical effect for preventing main shaft from springing back, but the movement of its limit plate needs realize that device is complicated and prevents back by torque spring
It plays ineffective, influences limit effect.
Transmission chain application No. is 018019403.6 displaceable contact on electrical power breaker is by the locking member
(13；31) a brake component (32a is set up；32b；42), which guides on this brake component in opening procedure, and should
Locking member is being maintained at its position static relative to connector before a predetermined position to connector 3 described in this.Its
The 25th row of specification 4/6: the locking member is supported on one by stop surface 19 under the power effect of reset spring 18 and passes through connector
Pin 20 on；The 25th row of specification 5/6: according to reason 5 to Fig. 7, hairpin shape butterfly is designed as the brake component that locking member 31 is set up
Shape spring, spring coil are wrapped the first coupling pin 33；The 10th row of specification 6/6: according to Fig. 8 to Figure 10, another embodiment
Brake component be designed to the component 42 with guide pin conduit 41 of a rigidity, which is fixed on the coupling section 5 of transmission chain.It can
Seeing the patent although realizes the technical effect for preventing main shaft from springing back, but the movement of its limit plate is needed by butterfly spring reality
Existing, device is complicated and anti-rebound ineffective, influences limit effect.
Summary of the invention
It is an object of the present invention to provide a kind of easy and the operation is stable main shaft limiting devices.
Specifically, the present invention adopts the following technical solutions realize: including moving contact component, static contact component and master
The cantilever that axis further includes limit plate and is fixedly installed on main shaft, limit plate are rotated freely by axle center of rotary shaft, limit plate
On be provided with the first abutting part and the second abutting part, it is convex that the lower end in cantilever matched with the second abutting part is provided with second
It rises, is equipped with the first protrusion in the upper end of cantilever.
Furthermore, when division brake structure is moved from "on" position to gate-dividing state, the first protrusion and described first
Abutting part collision, by the first abutting part to the impetus of the second abutting part, the second abutting part holds the second protrusion of cantilever,
Main shaft rebound is prevented.
It should be understood that the cantilever on main shaft is fixed together with main shaft, rotated with the rotation of main shaft.
Furthermore, the second abutting part is with reeded hook-shaped.
Furthermore, rotary shaft is riveting axis.
Furthermore, main shaft is equipped with baffle, further includes the limit shaft matched with baffle, when separating brake, under baffle
End is limited axle bumper and lives, to finally limit the final position of main shaft.
It should be understood that the lower end of baffle is limited axle bumper and lives when separating brake, to make to be fixed on a position when main shaft separating brake
It furthermore, further include support plate, one end cap of support plate is on limit shaft, and another end cap is on the rotary shaft.
It should be understood that the setting of support plate increases structural strength, while playing protective action.
Furthermore, the both ends of support plate are fixed by split washer.
Beneficial effects of the present invention are as follows: main shaft limiting device of the invention, structure is simple, number of parts is few, occupies empty
Between it is small.It is realized using limit plate self structure and gravity principle, improves the impact resistance of limit plate, effectively prevent main shaft
Rebound, and then improve frame-type circuit breaker and be resistant to index in short-term.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is side diagram of the invention.
Fig. 3 is the working state schematic representation that the present invention closes a floodgate.
Fig. 4 is the working state schematic representation of separating brake of the present invention.
Fig. 5 is that enlarged drawing is hit in cantilever of the present invention and the collision of limit plate upper end.
Fig. 6 is that enlarged drawing is collided in cantilever of the present invention and limit plate lower end.
Label in figure: 1- moving contact component, 2- static contact component, 3- main shaft, 4- side plate, 5- limit plate, 6- connecting rod, 7-
Cantilever, 8- baffle, 9- rivet axis, the first abutting part of 10-, the second abutting part of 11-, 12- limit shaft, 13- support plate, 14- first
Protrusion；The second protrusion of 15-.
Below with reference to embodiment and referring to attached drawing, present invention is further described in detail.
The main shaft limiting device of the present embodiment is applied to division brake structure as shown in Figure 1.The division brake structure includes quiet
Contact assembly 2, moving contact component 1, main shaft 3.For main shaft 3 by two support positioning of side plate 4, main shaft 3 is rotatable.It is fixed on main shaft 3
It is provided with connecting rod 6, connecting rod 6 and moving contact component 1 are hinged, and so that moving contact component 1 is linked with the forward and reverse rotation of main shaft 3, into
And realize the contact between the moving contact in moving contact component 1 and the static contact in static contact component 2 or separate, i.e. realization division
Lock movement.The division brake structure realizes the "on" position and separating brake between static contact component 2 and moving contact component 1 by connecting rod 6
State difference is as shown in Figure 3 and Figure 4.It should be noted that main shaft limiting device of the invention is not limited to be applied to as shown in Figure 1
Division brake structure structure in, can also be applied to realize identical function any other occasion, static contact group therein
The structure of part and moving contact component is also possible to not influence other any forms that function of the present invention is realized.
The main shaft limiting device of the present embodiment includes the cantilever 7 being fixedly installed on main shaft 3 and matches reality with cantilever 7
The limit plate 5 of 3 rebound function of main shaft is now prevented, specific structure is as shown in Fig. 1,5,6.Limit plate 5 can be using rotary shaft as axle center
It rotates freely, the present embodiment is provided with the first abutting part 10 in the upper end of limit plate 5, and the lower end of limit plate 5 is provided with second
Abutting part 11, the second abutting part 11 are with reeded hook-shaped, and the lower end in cantilever 7 matched with the groove is provided with
Second protrusion 15 is equipped with the first protrusion 14 in the upper end of cantilever 7.When division brake structure is moved from "on" position to gate-dividing state
When, the rotation of main shaft 3 drives cantilever 7 to link, and the first protrusion 14 of cantilever 7 and the first abutting part 10 of 5 upper end of limit plate collide, and leads to
The first abutting part 10 is crossed to the impetus of the second abutting part 11, realizes that cantilever 7 and limit plate 5 are revolved towards opposite desired orientation
Turn, causes the second protrusion 15 of cantilever 7 gradually to move in the groove from the groove phase-separated state with limit plate 5, limit plate 5
The second abutting part 11 hook portion hold cantilever 7, main shaft 3 rebound prevented.The hook of second abutting part 11 of limit plate 5
Only the short time holds cantilever 7 for part, since there are the hook portions of gravity, 5 lower end of limit plate to revert back Fig. 5 institute below rotary shaft
Show position, limit plate 5 returns to original state to move to division brake structure next time from "on" position to gate-dividing state.
It should be noted that the set-up mode of rotary shaft on above-mentioned limit plate 5 is not particularly limited in the present embodiment, both may be used
To be that rotary shaft itself is fixed on side plate, matched limit plate 5 is actively set in the rotary shaft, is also possible to rotary shaft
Only by side plate positioning support, its own can be rotated, and matched limit plate 5 is fixed in rotary shaft.It is excellent in the present embodiment
The set-up mode of side plate is fixed in choosing using rotary shaft, and is further preferably fixed by the way of riveting, i.e., such as Figures 5 and 6 institute
The riveting axis 9 shown.Limit plate 5 is equipped with hole, and limit plate 5 is covered on riveting axis 9 by the hole, can be with flexible rotating.
In order to determine the final position of main shaft under gate-dividing state, the present embodiment be additionally provided with baffle 8 as shown in Figure 2 and
With the limit shaft 12 of the baffle 8 cooperation.When separating brake, after the hook portion that cantilever 7 is limited plate 5 is held, cantilever 7 is slow with main shaft
Revolution, until the lower end for the baffle 8 being fixed on main shaft is limited axis 12 and blocks, to prevent main shaft 3 from further rotating, in turn
The position of final limitation main shaft 3.Side plate 4 is fixed in one end of limit shaft 12 can be realized above-mentioned purpose, but as a kind of preferred
A side plate 4 is fixed in one end of limit shaft 12 by structure, the present embodiment, and the other end is fixed on another side plate 4, to make a left side
Right two side plates 4 are connected by limit shaft 12.
Structural strength in order to further increase, the present embodiment are additionally provided with the support plate 13 as shown in Fig. 1,3,4.Above-mentioned limit
Position axis 12 be support plate 13 support is provided, an end cap of support plate 13 on limit shaft 12, another end cap riveting axis 9 on, on
The both ends for stating support plate 13 are fixed by split washer.Since stress is very big in 5 course of work of limit plate, riveting axis 9 is easily caused
Bending.By support plate 13, rivets 9 both ends of axis and be fixed by side plate 4 and support plate 13, stability enhancing；At the same time, it props up
Fagging 13 plays protective action, is in limit plate 5 in the region of a relative closure, avoids shadow in 5 rotation process of limit plate
It rings and arrives other parts.
Motion principle of the invention:
Step 1, as shown in figure 5, when shaft is by closing position quick rotation to open position, limit is hit in 7 upper end of cantilever
12 upper end first shock point of plate；
Step 2, as shown in fig. 6, limit plate is turned to such as figure position, while main shaft starts to spring back, and limit is hit in 7 lower end of cantilever
Cantilever 7 is held in the second shock point of position 12 lower end of plate, the lower end of limit plate 12, and the rebound of main shaft 3 is prevented.
Although the present invention has been described by way of example and in terms of the preferred embodiments, embodiment is not for the purpose of limiting the invention.Not
It is detached from the spirit and scope of the present invention, any equivalent change or retouch done also belongs to the protection scope of the present invention.Cause
This protection scope of the present invention should be based on the content defined in the claims of this application.