CN206362285U - Circuit breaker tripping device for detecting distance of travel - Google Patents
Circuit breaker tripping device for detecting distance of travel Download PDFInfo
- Publication number
- CN206362285U CN206362285U CN201621453150.9U CN201621453150U CN206362285U CN 206362285 U CN206362285 U CN 206362285U CN 201621453150 U CN201621453150 U CN 201621453150U CN 206362285 U CN206362285 U CN 206362285U
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- CN
- China
- Prior art keywords
- rocking arm
- circuit breaker
- micrometer
- rocker arrangement
- tripping device
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Abstract
A kind of circuit breaker tripping device for detecting distance of travel, testing agency and detection reference block including base, on base, detection reference block is arranged on the trigger mechanism installation place of breaker, described testing agency includes rocker arrangement and micrometer, one end of the rocker arrangement is connected with the measurement end of micrometer, the other end is provided with rocking arm, the rocking arm is swingable to be arranged on rocker arrangement and is provided with push pedal in its end, and micrometer can drive rocker arrangement to do the rectilinear movement closer or far from breaker；Push pedal is promoted under the propulsion of micrometer with detecting that the reference plane of reference block is in contact, then measures circuit breaker tripping.The utility model provides circuit breaker tripping device for detecting distance of travel a kind of simple in construction and easily operated.
Description
Technical field
The utility model is related to detecting instrument field, more particularly to a kind of circuit breaker tripping device for detecting distance of travel.
Background technology
Trip action can occur when short circuit or electric current are excessive for circuit breaker, cut off electric current, be because in breaker
Trigger mechanism short circuit or electric current it is excessive when act, touched the trip gear in breaker so that breaker occur
Cut off the trip action of electric current.What the actuating length of trigger mechanism was limited by, trip gear must having in trigger mechanism
Imitate and trip action occurs in actuating length, otherwise breaker will be unable to normal dropout, serious consequence may be triggered, thus it is de-
The dropout stroke of buckle device must reliably be ensured.In product design, the dropout stroke of trip gear is reliable, but
Because there is scale error in the part of different batches, it is possible to cause the reliability decrease of the dropout stroke of trip gear, so
Quality supervision department often can inspect by random samples to the dropout stroke of circuit breaker.It is bad to there is operability in existing detection means,
The problem of measurement accuracy is undesirable is, it is necessary to be improved.
Utility model content
The purpose of this utility model is to overcome the defect of prior art to break there is provided a kind of simple in construction and easily operated
Road device dropout device for detecting distance of travel.
To achieve the above object, the utility model employs following technical scheme：
A kind of circuit breaker tripping device for detecting distance of travel, including base, the testing agency on base and detection benchmark
Block 43, detection reference block 43 is arranged on the installation place of trigger mechanism 41 of breaker 4, and described testing agency includes rocker arrangement 1
With micrometer 2, one end of the rocker arrangement 1 is connected with the measurement end of micrometer 2, and the other end is provided with rocking arm 11, described to shake
Arm 11 is swingable to be arranged on rocker arrangement 1 and is provided with push pedal 12 in its end, and micrometer 2 can drive rocker arrangement 1 to do
Closer or far from the rectilinear movement of breaker 4；Reference plane 432 of the push pedal 12 under the propulsion of micrometer 2 with detection reference block 43
It is in contact, then promoting measures the dropout of breaker 4.
Further, described rocker arrangement 1 includes rocking arm 11 and pedestal 13, and one end of the pedestal 13 is provided with two projections
131, the projection 131, which is provided with through hole 132, through hole 132, is provided with bearing 133, and one end of the rocking arm 11 is pushed away provided with described
Plate 12, the other end is provided with rotation hole and between two projections 131, rotation of the bearing pin 134 through bearing 133 and rocking arm 11
Hole is arranged on two projections 131.
Further, the top of the rocking arm 11 is equipped with handle 14.
Further, the rocking arm 11 is arranged on pedestal 13, one end of the pedestal 13 be provided with rocking arm 11 and with thousand points
The measurement end of chi 2 is connected, and the other end is provided with the positioning screw 15 installed in the lower section of rocking arm 11, and rocking arm 11 is overlapped on positioning spiral shell
On nail 15 and in horizontality.
Further, it is also equipped with magnet 16 in described positioning screw 15.
Further, line slideway 17 is provided between described rocker arrangement 1 and base, line slideway 17 is provided with and straight line
The sliding block 18 that guide rail 17 is slidably matched, rocker arrangement 1 is slidably mounted on line slideway 17 by sliding block 18, the straight line
The two ends of guide rail 17 are respectively provided with spacing block 19.
Further, spring 20 is provided between the pedestal 13 of the rocker arrangement 1 and the block 19 of line slideway 17, it is described
The one end of spring 20 is connected on the block 19 being oppositely arranged with micrometer 2, and the other end is connected to pedestal 13 and set relatively with breaker 4
The one end put.
Further, detection reference block 43 two ends are provided with the mounting hole 431 for installing, and detect the side of reference block 43
Reference plane 432 is set to, the reference plane 432 is overlapped with the center line of two ends mounting hole 431.
Further, in addition to one be provided with measurement window 46 upper lid 45, the upper lid 45 be arranged on breaker 4 on and
Measurement window 46 is oppositely arranged with detection reference block 43.
Further, the base is provided with locating piece 31, and the locating piece 31 forms the sky for breaker 4 to be fixedly mounted
Chamber；The base is provided with installing plate 34, and the rocker arrangement 1 is arranged on installing plate 34, also installed on the installing plate 34
There is a locating piece 21 for fixing micrometer 2, the locating piece 21 is provided with horizontal hole, the level of micrometer 2 is arranged on hole
In and be connected with the pedestal 13 of rocker arrangement 1.
Circuit breaker tripping device for detecting distance of travel of the present utility model drives rocker arrangement to move linearly by micrometer, rocking arm
Device is measured to circuit breaker internal size, realizes the detection to circuit breaker tripping stroke, and structure of the detecting device is simple, it is easy to
Operation, detecting step is easy, and operability is good.Moved in addition, rocker arrangement is arranged on line slideway, coordinate micrometer
It is used as the instrument of measurement so that detection means has higher measurement accuracy.
Brief description of the drawings
Fig. 1 is the overall structure diagram of circuit breaker tripping device for detecting distance of travel of the present utility model；
Fig. 2 is the decomposition texture schematic diagram of circuit breaker tripping device for detecting distance of travel of the present utility model；
Fig. 3 is the schematic diagram of the trigger mechanism mounting structure part of the utility model breaker to be detected；
Fig. 4 is the trigger mechanism structural representation of the utility model breaker to be detected；
Fig. 5 is the detection status architecture schematic diagram of the utility model breaker to be detected；
Fig. 6 is the structural representation of detection reference block of the present utility model；
Fig. 7 is detection original state structural representation of the present utility model；
Fig. 8 is Fig. 7 partial structural diagram；
Fig. 9 is detection state partial structural diagram of the present utility model.
Embodiment
Embodiment of the present utility model is provided below in conjunction with accompanying drawing 1 to 9, further illustrates that breaker of the present utility model takes off
Detain device for detecting distance of travel embodiment.Circuit breaker tripping device for detecting distance of travel of the present utility model is not limited to following examples
Description.
As shown in Figures 1 to 6, a kind of circuit breaker tripping device for detecting distance of travel, including base, the detection on base
Mechanism and detection reference block 43.Breaker 4 to be detected is fixed on base, provided with trigger mechanism 41 and dropout in breaker 4
Plate 42, when short circuit or excessive electric current occur in circuit, trigger mechanism 41 is acted, and promotes dropout plate 42 to occur breaker 4 de-
Pull work, the dropout stroke detection of breaker refers to that detection dropout plate 42 how many can be sent out apart from rear breaker having been promoted by external force
Raw trip action.Described testing agency includes rocker arrangement 1 and micrometer 2, one end and the micrometer 2 of the rocker arrangement 1
Measurement end be connected, the other end is provided with the rocking arm 11 that is oppositely arranged with breaker 4, and described rocking arm 11 is swingable to be arranged on
Push pedal 12 is provided with rocker arrangement 1 and in end, the push pedal 12 can be stretched into inside breaker 4 when rocking arm 11 is swung and carried out
Measurement.Micrometer 2 is connected with rocker arrangement 1, and rocker arrangement 1 can be driven to do the rectilinear movement closer or far from breaker 4.
Trigger mechanism 41 is not installed with detection breaker 4 used, but detection base is accordingly installed in the installation place of trigger mechanism 41
Quasi- block 43, during detection, detection reference block 43 be arranged on breaker 4 the installation place of trigger mechanism 41 and with the dropout plate of breaker 4
42 are oppositely arranged, and described detection reference block 43 is provided with reference plane 432, and push pedal 12 is under the propulsion of micrometer 2 with detecting base
The reference plane 432 of quasi- block 43 is in contact, and then micrometer is zeroed, and the position of now push pedal 12 is exactly to measure rising for dropout stroke
Beginning position, promote cause breaker 4 thread off, measure dropout stroke, the position when push pedal 12 is contacted with reference plane 432 to break
The distance between position of push pedal 12 is testing agency's numerical value to be detected when road device 4 is threaded off.
Before detection, breaker 4 is arranged on base, and detection reference block 43 is installed installed in the internal trigger mechanism 41 of breaker 4
Place, the rocking arm 11 of rocker arrangement 1 swings and then is positioned in breaker 4, and regulation micrometer 2 causes push pedal 12 and detection reference block
43 reference plane 432 is in contact, and the reading of micrometer 2 is zeroed；During detection, detection reference block 43 is taken out from breaker 4, is adjusted
Save micrometer 2 and promote rocker arrangement 1, until push pedal 2 promotes dropout plate 42 to cause breaker 4 to occur trip action, read thousand points
The reading of chi 2.The reading of micrometer 2 is subtracted into the installation site of trigger mechanism 41 and the distance at the action of trigger mechanism 41, is
The dropout travel values of breaker 4 to be measured.The utility model to measure circuit breaker internal by the push pedal in rocker arrangement
Size become to facilitate feasible, promote rocker arrangement rectilinear movement to realize inspection to circuit breaker tripping stroke by adjusting micrometer
Survey, structure of the detecting device is simple, detecting step is easy, testing result is accurate, and operability is good.
As shown in Fig. 2 a kind of embodiment of rocker arrangement 1, described rocker arrangement 1 includes rocking arm 11 and pedestal 13, institute
One end of pedestal 13 is stated provided with two projections 131, through hole 132 is respectively equipped with two described projections 131, the rocking arm 12
One end is provided with the push pedal 12, and the other end is provided with rotation hole and between two projections 131, and bearing pin 134 leads to through two
The rotation hole of hole 132 and rocking arm 12 is arranged on two projections 131, provided with two bearings in the through hole 132 of two projections 131
133, two bearings 133 are set in the two ends of bearing pin 134 and are located between bearing pin 134 and the side wall of through hole 132, and two
The side of individual projection 131 is respectively equipped with the end cap 135 of support bearing pin 134, and rocking arm 11 can rotate around bearing pin 134, and then by rocking arm
11 swingable are arranged on pedestal 13.Rocking arm can be swung on pedestal, can simplify the detection of circuit breaker internal physical dimension
Process, it is easy to operate, improve the convenience of operation.
It is preferred that, one end of the pedestal 13 is provided with rocking arm 11 and is connected with the measurement end of micrometer 2, and the other end is set
There is positioning screw 15, the positioning screw 15 is arranged on the lower section of rocking arm 11, and rocking arm 11 can be overlapped when being swung on pedestal 13
In positioning screw 15 and in horizontality, and then realize that passing through positioning screw 15 realizes the position for controlling the bottom of rocking arm 11,
And positioning screw 15 can play a part of adjusting position.It is preferred that, magnet 16 is also equipped with positioning screw 15, it is described
Magnet 16 can attract rocking arm 11 so that rocking arm 11 can more be stablized when being located at bottom position.
In addition, the top of rocking arm 11 is equipped with handle 14, described handle 14 easily can lift rocking arm 11 so that inspection
Operation is more convenient during survey.The push pedal 12 is arranged on rocking arm 11 by screw, can be in contact with detection reference block 43,
The dropout plate 42 of breaker 4 can be promoted during detection, the measurement to the inside dimension of breaker 4 is realized so that easy to operate feasible.
Further, described rocker arrangement 1 is arranged on the installing plate 34 on base, rocker arrangement 1 and installing plate 34 it
Between be additionally provided with line slideway 17, the two ends of the line slideway 17 are oppositely arranged with micrometer 2 and breaker 4 respectively, and straight line is led
Rail 17 is provided with the sliding block 18 being slidably matched with line slideway 17, and rocker arrangement 1 is slidably mounted on straight line by sliding block 18
On guide rail 17.It is rocker arrangement by the sliding matching structure provided with line slideway and sliding block between rocker arrangement and base
Mobile to provide fixed track, accurate the control direction of motion and precision improve the accuracy and reliability of detection, reduced simultaneously
The friction and power consumption of rocker arrangement movement.
Specifically, the two ends of the line slideway 17 are respectively equipped with block 19, and described block 19 is arranged on for limitation
The moving range of pedestal 13 on sliding block 18, and then limit the moving range of rocker arrangement 1.It is preferred that, it is relative with micrometer 2 to set
Spring 20 is connected between the block 19 and the pedestal 13 of rocker arrangement 1 put, described spring 20 is in extended state, made all the time
Pedestal 13 can be with line slideway 17 under the spring-force driven dual of spring 20 the micrometer 2 in the same direction of sliding block 18 1 move, until
The block 19 being oppositely arranged by micrometer 2 or with micrometer 2 stops.When the measurement end of micrometer promotes rocker arrangement accurately to push away
When entering, the spring-force driven dual of spring enables rocker arrangement accurately to be promoted to breaker together with the sliding block of line slideway, carries
The accuracy of high measurement result and the stability of operation.
As depicted in figs. 1 and 2, described base includes bottom plate 3 and locating piece 31 and installing plate on bottom plate 3
34, the locating piece 31 forms the cavity for breaker 4 to be fixedly mounted.The locating piece 31 is at least provided with one piece, Ke Yi
It can be formed when formation cavity or more than two locating pieces 31 are put on one piece of locating piece for installing breaker 4
Cavity.Embodiment as shown in Figure 1, cavity is formed by three pieces of locating pieces, and breaker 4 installs in the cavities simultaneously corresponding edge
It is arranged on against each locating piece 31, and then by breaker 4 on bottom plate 3.It is preferred that, the position of locating piece 31 can be adjusted,
Certain extruding is produced to breaker 4 so that the installation of breaker 4 is more stable, improve the stability installed.It will be apparent that fixed
Position block 31 can also be using being set to locating slot or installation is fixed to breaker 4 in other form.Described installing plate
The mounting blocks 21 for micrometer 2 to be fixedly mounted are additionally provided with 34, described mounting blocks 21 are provided with horizontally disposed hole, thousand points
The pedestal 13 of chi 2 through Kong Bingyu rocker arrangements 1 is connected, and then being arranged on the level of micrometer 2 on base, and causes thousand
Propulsion of the chi 2 in measurement is divided to be maintained at horizontality, it is ensured that the stability of detection process and the accuracy for improving measurement result.
As shown in fig. 6, a kind of preferred embodiment of detection reference block 43, the two ends of detection reference block 43, which are provided with, to be used to pacify
The mounting hole 431 of dress, the side depression of detection reference block 43 is set to reference plane 432, the reference plane 432 and two ends mounting hole
431 center line is overlapped.
As shown in Figures 3 to 6, the trigger mechanism 41 in breaker 4 is oppositely arranged with dropout plate 42, the trigger mechanism 41
Installation site be two locating dowels 44 set in the shell of breaker 4, corresponding trigger mechanism 41, which is provided with, to be used to assemble
Cylindrical hole 412.The side relative with dropout plate 42 of trigger mechanism 41 is provided with mobilizable cylinder 411, the cylinder 411
At action for trigger mechanism 41, end and the dropout plate 42 of cylinder 411 are oppositely arranged.Trigger mechanism 41 can be electromagnetic motor
Structure, cylinder 411 is the push rod of electromagnetic mechanism, when short circuit or excessive electric current occur in circuit, the push rod ejection of electromagnetic mechanism,
Cylinder 411 can be ejected to dropout plate 42, and end promotes dropout plate 42 breaker 4 is occurred trip action, circuit breaker
The detection of dropout stroke just refers to that dropout plate 42 to be detected much can be threaded off apart from rear breaker 4 having been promoted by external force
Action.
Specifically, detection reference block 43 is sleeved on breaker without assembling trigger mechanism 41 in breaker 4 to be detected
Two locating dowels 44 for assembling trigger mechanism 41 that 4 shell is set, the two ends of the detection reference block 43 are accordingly set
There is the mounting hole 431 for installation, detect that the side of the side of reference block 43 is set to reference plane 432, when detection reference block 43 is pacified
The reference plane 432 is overlapped with the center line of two locating dowels 44 when in mounting post 44.It is preferred that, described dropout stroke
Detection means also includes a customized upper lid 45 with measurement window 46 matched with breaker.Breaker 4 to be detected
On be equipped with lid 45, the upper lid 45 is provided with the measurement window 46 being oppositely arranged with detection reference block 43, it is preferred that described
Measurement window 46 can be set to rectangle.Measurement window 46 is easy to measurement of the rocker arrangement 1 to the internal structure of breaker 4, it is ensured that rocking arm
The detection process of device 1 will not be hindered.
It is a specific embodiment of the present utility model as shown in Figure 7 to 9.During detection, detection reference block will be installed
43 and the breaker 4 of upper lid 45 be fixedly mounted in the cavity formed between locating piece 31, rocking arm 11 is lowered into horizontal level
And connect with positioning screw 15, the push pedal 12 of the end of rocking arm 11 is placed in breaker 4, and regulation micrometer 2 promotes push pedal 12 to touch
To the reference plane 432 of detection reference block 43, the reading of micrometer 2 is zeroed, specifically, can be by instruments such as clearance gauge, magnifying glasses
As auxiliary, to improve performance accuracy.Detection reference block 43 is taken out, micrometer 2 is adjusted again, until push pedal 12 promotes breaker
4 dropout plate 42 causes breaker 4 to occur trip action.In the present embodiment, now the reading of micrometer 2 is exactly outside breaker 4
It is used to assemble the center of two locating dowels 44 of trigger mechanism 41 on shell to the distance of the trip positions of breaker 4.It will survey
The numerical value obtained subtracts the center of two cylindrical holes 431 on trigger mechanism 41 to the distance of the end of cylinder 411, it becomes possible to
Obtain the dropout travel values of breaker 4.The utility model causes the size for measuring circuit breaker internal to become by rocker arrangement
Facilitate feasible, the application of line slideway and micrometer make it that the data of measurement are accurately reliable, and operability is good, and measurement accuracy is high.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all be regarded
To belong to protection domain of the present utility model.
Claims (10)
1. a kind of circuit breaker tripping device for detecting distance of travel, it is characterised in that：Testing agency including base, on base and
Reference block (43) is detected, detection reference block (43) is arranged on trigger mechanism (41) installation place of breaker (4), described detection machine
Structure includes rocker arrangement (1) and micrometer (2), and one end of the rocker arrangement (1) is connected with the measurement end of micrometer (2),
The other end is provided with rocking arm (11), and the rocking arm (11) is swingable to be arranged on rocker arrangement (1) and be provided with push pedal in its end
(12), micrometer (2) can drive rocker arrangement (1) to do the rectilinear movement closer or far from breaker (4)；Push pedal (12) is thousand
Reference plane (432) under the propulsion of point chi (2) with detection reference block (43) is in contact, then promote make breaker (4) thread off into
Row measurement.
2. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：Described rocker arrangement (1)
Including rocking arm (11) and pedestal (13), one end of the pedestal (13), which is provided with two projections (131), the projection (131), to be set
Have and bearing (133) is provided with through hole (132), through hole (132), one end of the rocking arm (11) is provided with the push pedal (12), another
End is provided with rotation hole and between two projections (131), rotation of the bearing pin (134) through bearing (133) and rocking arm (11)
Hole is arranged on two projections (131).
3. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：The top of the rocking arm (11)
Equipped with handle (14).
4. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：The rocking arm (11) is arranged on
On pedestal (13), one end of the pedestal (13) is provided with rocking arm (11) and is connected with the measurement end of micrometer (2), the other end
Provided with the positioning screw (15) installed in the lower section of rocking arm (11), rocking arm (11) is overlapped in positioning screw (15) and in level
State.
5. circuit breaker tripping device for detecting distance of travel according to claim 4, it is characterised in that：Described positioning screw (15)
On be also equipped with magnet (16).
6. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：Described rocker arrangement (1)
Line slideway (17) is provided between base, line slideway (17) is provided with the sliding block being slidably matched with line slideway (17)
(18), rocker arrangement (1) is slidably mounted on line slideway (17) by sliding block (18), and the two of the line slideway (17)
End is respectively provided with spacing block (19).
7. circuit breaker tripping device for detecting distance of travel according to claim 6, it is characterised in that：The rocker arrangement (1)
Spring (20) is provided between pedestal (13) and the block (19) of line slideway (17), described spring (20) one end is connected to and thousand
On the block (19) that point chi (2) is oppositely arranged, the other end is connected to one end that pedestal (13) is oppositely arranged with breaker (4).
8. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：The detection reference block (43)
Two ends are provided with the mounting hole (431) for installing, and the side of detection reference block (43) is set to reference plane (432), the reference plane
(432) center line with two ends mounting hole (431) is overlapped.
9. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：Also include one provided with measurement
The upper lid (45) of window (46), the upper lid (45) is arranged on breaker (4) and measurement window (46) and detection reference block
(43) it is oppositely arranged.
10. circuit breaker tripping device for detecting distance of travel according to claim 1, it is characterised in that：The base is provided with fixed
Position block (31), the locating piece (31) forms the cavity for breaker (4) to be fixedly mounted；The base is provided with installing plate
(34), the rocker arrangement (1) is arranged on installing plate (34), is also equipped with being used to fix micrometer on the installing plate (34)
(2) locating piece (21), the locating piece (21) is provided with horizontal hole, micrometer (2) level mounted in the bore and with shaking
The pedestal (13) of arm assembly (1) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453150.9U CN206362285U (en) | 2016-12-27 | 2016-12-27 | Circuit breaker tripping device for detecting distance of travel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453150.9U CN206362285U (en) | 2016-12-27 | 2016-12-27 | Circuit breaker tripping device for detecting distance of travel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206362285U true CN206362285U (en) | 2017-07-28 |
Family
ID=59376382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621453150.9U Active CN206362285U (en) | 2016-12-27 | 2016-12-27 | Circuit breaker tripping device for detecting distance of travel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206362285U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708554A (en) * | 2018-12-28 | 2019-05-03 | 长沙五七一二飞机工业有限责任公司 | A kind of stroke measurment fixture for Hydraulic Servo Mechanism for Plane performance detection |
| CN110057264A (en) * | 2019-05-07 | 2019-07-26 | 天津市百利电气有限公司 | Square lock catch check tool in breaker four-bar mechanism |
-
2016
- 2016-12-27 CN CN201621453150.9U patent/CN206362285U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708554A (en) * | 2018-12-28 | 2019-05-03 | 长沙五七一二飞机工业有限责任公司 | A kind of stroke measurment fixture for Hydraulic Servo Mechanism for Plane performance detection |
| CN110057264A (en) * | 2019-05-07 | 2019-07-26 | 天津市百利电气有限公司 | Square lock catch check tool in breaker four-bar mechanism |
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