CN106877183B - A kind of gas-filling cabinet, release unit and its height retaining mechanism - Google Patents

A kind of gas-filling cabinet, release unit and its height retaining mechanism Download PDF

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Publication number
CN106877183B
CN106877183B CN201710250345.6A CN201710250345A CN106877183B CN 106877183 B CN106877183 B CN 106877183B CN 201710250345 A CN201710250345 A CN 201710250345A CN 106877183 B CN106877183 B CN 106877183B
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CN
China
Prior art keywords
lever
release unit
check lock
lock lever
jam plate
Prior art date
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Application number
CN201710250345.6A
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Chinese (zh)
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CN106877183A (en
Inventor
范冠鹏
刘洋
潘亚培
宋浩
李金辉
邵淑敏
贾华景
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Henan Senyuan Electric Co Ltd
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Henan Senyuan Electric Co Ltd
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Application filed by Henan Senyuan Electric Co Ltd filed Critical Henan Senyuan Electric Co Ltd
Priority to CN201710250345.6A priority Critical patent/CN106877183B/en
Publication of CN106877183A publication Critical patent/CN106877183A/en
Application granted granted Critical
Publication of CN106877183B publication Critical patent/CN106877183B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/015Boards, panels, desks; Parts thereof or accessories therefor
    • H02B1/04Mounting thereon of switches or of other devices in general, the switch or device having, or being without, casing
    • H02B1/044Mounting through openings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035Gas-insulated switchgear

Abstract

The present invention has supplied a kind of gas-filling cabinet, release unit and its height retaining mechanism, complicated for operation when solving the problems, such as that the height and position of release unit is fixed in manually installed fixed structure in the prior art.Release unit includes the mechanism rack being fixedly linked for the circuit breaker cradle with release unit with height retaining mechanism, the mechanism rack is equipped with the lever that can be swung up and down, one end of the lever is equipped with check lock lever, the lever is equipped with for being slidably matched with the jam plate wedge surface on cabinet when release unit moves from back to front so that the pushing tow structure that the check lock lever is swung, the lower end of check lock lever is equipped with the tapered end for crossing the jam plate in the downward swing process of check lock lever, the tapered end has can be with the downside of jam plate along the auxiliary section that short transverse block cooperates.

Description

A kind of gas-filling cabinet, release unit and its height retaining mechanism
Technical field
The present invention relates to a kind of gas-filling cabinet, release unit and its height retaining mechanisms.
Background technique
Currently, in the power system, since gas-filling cabinet has many advantages, such as small in size, strong environmental adaptability, reliable and stable, Gradually it is widely applied by client.But it for the release unit in gas-filling cabinet, needs in assembly manually release unit It moves into narrow gas-filling cabinet cabinet, since release unit is more heavy, a usual people is unable to complete work, when open circuit After device device is moved into cabinet, needs manually to refill the fixed structures such as top nut and come the front-rear position to breaker, height and position It is limited with left-right position.Entire assembling process is time-consuming and laborious, and efficiency is extremely low, and be easy to cause industrial injury.Work as needs When removing breaker, it is also necessary to first remove fixed structure, then release unit could be carried away cabinet by least two people partner.Such as Since this, it will the mass production for seriously affecting Products aggravates the manufacturing cost of company, is unfavorable for improving the city of product Field competitiveness.
Summary of the invention
The purpose of the present invention is to provide a kind of release unit height retaining mechanisms, artificial in the prior art to solve Installation fixed structure problem complicated for operation when the height and position of release unit is fixed;Purpose, which also resides in, provides one kind Use the release unit and gas-filling cabinet of the height retaining mechanism.
To achieve the above object, release unit of the present invention is with the technical solution of height retaining mechanism: a kind of breaker Device height retaining mechanism, including the mechanism rack being fixedly linked for the circuit breaker cradle with release unit, the machine Structure bracket is equipped with the lever that can be swung up and down, and one end of the lever is equipped with check lock lever, and the lever is equipped in open circuit It is slidably matched with the jam plate wedge surface on cabinet so that the pushing tow structure that the check lock lever is swung, lock when device device moves from back to front The lower end of tight bar is equipped with the tapered end for crossing the jam plate in the downward swing process of check lock lever, and the tapered end has can be with lock The downside of plate is along the auxiliary section that short transverse block cooperates.
Height retaining mechanism includes the jam plate, and the jam plate is equipped with the large diameter hole swung by downwards for tapered end and position Diameter holes on front side of large diameter hole, the aperture of the diameter holes is greater than the outer diameter of check lock lever and is less than the outer diameter of tapered end, described small Diameter hole has for the lower opening edge that block cooperates along the vertical direction of the auxiliary section with tapered end.
Height retaining mechanism includes lever described in two, and pushing tow structure is one end end corresponding with two levers simultaneously Connected mandril, the mandril and check lock lever are staggeredly arranged in the longitudinal direction.
The lever is equipped with the reset spring for driving tapered end backswing and the jam plate to be detached from.
The technical solution of release unit of the present invention is: a kind of release unit, including circuit breaker cradle, the breaker Height retaining mechanism is fixed on bracket, the height retaining mechanism includes the mechanism rack being fixedly linked with circuit breaker cradle, The mechanism rack is equipped with the lever that can be swung up and down, and one end of the lever is equipped with check lock lever, and the lever is equipped with and is used for It is slidably matched with the jam plate wedge surface on cabinet so that the pushing tow that the check lock lever is swung when release unit moves from back to front Structure, the lower end of check lock lever are equipped with the tapered end for crossing the jam plate in the downward swing process of check lock lever, the tapered end tool Having can be with the downside of jam plate along the auxiliary section that short transverse block cooperates.
Height retaining mechanism includes the jam plate, and the jam plate is equipped with the large diameter hole swung by downwards for tapered end and position Diameter holes on front side of large diameter hole, the aperture of the diameter holes is greater than the outer diameter of check lock lever and is less than the outer diameter of tapered end, described small Diameter hole has for the lower opening edge that block cooperates along the vertical direction of the auxiliary section with tapered end.
Height retaining mechanism includes lever described in two, and pushing tow structure is one end end corresponding with two levers simultaneously Connected mandril, the mandril and check lock lever are staggeredly arranged in the longitudinal direction.
The technical solution of gas-filling cabinet of the present invention is: a kind of gas-filling cabinet, including release unit, and the release unit includes Circuit breaker cradle is fixed with height retaining mechanism on the circuit breaker cradle, and the height retaining mechanism includes and breaker branch The mechanism rack that frame is fixedly linked, the mechanism rack are equipped with the lever that can be swung up and down, and one end of the lever is equipped with lock Tight bar, the lever be equipped with for when release unit moves from back to front with cabinet on jam plate wedge surface be slidably matched so that The lower end of the pushing tow structure that the check lock lever is swung, check lock lever is equipped with for crossing the lock in the downward swing process of check lock lever The tapered end of plate, the tapered end has can be with the downside of jam plate along the auxiliary section that short transverse block cooperates.
Height retaining mechanism includes the jam plate, and the jam plate is equipped with the large diameter hole swung by downwards for tapered end and position Diameter holes on front side of large diameter hole, the aperture of the diameter holes is greater than the outer diameter of check lock lever and is less than the outer diameter of tapered end, described small Diameter hole has for the lower opening edge that block cooperates along the vertical direction of the auxiliary section with tapered end.
Height retaining mechanism includes lever described in two, and pushing tow structure is one end end corresponding with two levers simultaneously Connected mandril, the mandril and check lock lever are staggeredly arranged in the longitudinal direction.
The beneficial effects of the present invention are: release unit provided by the invention height retaining mechanism, mechanism rack and disconnected Road device bracket is fixedly linked and can be moved in gas-filling cabinet from back to front with release unit, in mobile process, pushing tow knot Structure is slidably matched with jam plate wedge surface drives check lock lever to swing, and the tapered end of check lock lever lower end is rocked to the downside of jam plate, and tapered end is matched Conjunction portion can cooperate with the downside of jam plate along short transverse block, and the related release unit of tapered end, check lock lever is made to be fixed on lock On plate, the locking automatically to release unit short transverse is realized, is come with manually installed fixed structure is needed in the prior art The height of release unit is fixed and is compared, it is easy to operate and reduce labor intensity.
Detailed description of the invention
Fig. 1 is the schematic diagram of circuit breaker cradle in gas-filling cabinet embodiment of the present invention;
Fig. 2 is support bracket fastened schematic diagram in gas-filling cabinet embodiment of the present invention;
Fig. 3 is the schematic diagram of right fixed plate in Fig. 2;
Fig. 4 is the schematic diagram of height fixing piece in gas-filling cabinet embodiment of the present invention;
Fig. 5 is the assembling schematic diagram of lever, check lock lever and tapered end in Fig. 4;
Fig. 6 is the schematic diagram of front and back locking member in gas-filling cabinet embodiment of the present invention;
Fig. 7 is the assembling schematic diagram of guide rod and block in Fig. 6;
Fig. 8 is that release unit is pushed into height fixing piece and front and back locking member when in place in gas-filling cabinet embodiment of the present invention Schematic diagram;
Fig. 9 is side view when release unit is not pushed into place in gas-filling cabinet embodiment of the present invention;
Figure 10 is side view when release unit is pushed into place in gas-filling cabinet embodiment of the present invention;
Figure 11 is main view when release unit is pushed into place in gas-filling cabinet embodiment of the present invention;
Figure 12 is perspective view when release unit is pushed into place in gas-filling cabinet embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The specific embodiment of gas-filling cabinet of the invention, as shown in Figures 1 to 12, gas-filling cabinet of the invention include breaker dress It sets, release unit includes circuit breaker cradle 1 and the pole (being not drawn into figure) on circuit breaker cradle 1, breaker Bracket 1 include for fixing the pole fixed plate 11 of pole, foreboard 12, back plate 16, foreboard 12 and back plate 16 it Between be fixed with side plate 13, side plate 13 is L-shaped structure, is equipped with 15 He of pulley in the lower section of side plate 13 and pole fixed plate 11 Snap-gauge 14, middle pulley 15 are located at the inside of snap-gauge 14.A mandril perforation is offered in the horizontal sides of side plate 13 (in figure not Draw) and two check lock levers perforation (being not drawn into figure), above three hole arranged for interval along the longitudinal direction, wherein mandril perforation Positioned at the outside of check lock lever perforation, i.e. mandril and check lock lever is staggeredly arranged in the longitudinal direction, and two check lock lever perforation are located at same One in the front-back direction on straight line.It is fixedly mounted in the horizontal sides of side plate 13 there are two support column 36, two support columns 36 are distinguished Between mandril perforation and the front and back and left and right directions of check lock lever perforation.
Release unit further includes height fixing piece 3, and height fixing piece 3 includes preceding lever 32 and rear lever 33, preceding lever 32 and rear lever 33 be obliquely installed in left-right direction, the corresponding end of the two is hinged, while being hinged with mandril 31.Preceding thick stick Bar 32 and rear lever 33 are articulated on support column 36 by pin 37 and block card 38, on the separate top of preceding lever 32 and rear lever 33 The end of bar 31 is installed with preceding check lock lever 34 and rear check lock lever 35, and the lower end of check lock lever is fixed with tapered end 310, tapered end 310 it is outer Diameter is greater than the outer diameter of check lock lever and forms step surface, and in the present embodiment, step surface is inclined surface, is installed in release unit When position, it can just cooperate with the downside block of right guide rail 22.In the present embodiment, tapered end 310, check lock lever and lever are integrally set It sets.In other embodiments, removable connection type can be used, such as is threadedly coupled.Between mandril 31 and support column 36 It is provided with check lock lever reset spring 39, the other end of check lock lever reset spring 39 is fixed on side plate 13.In use, mandril 31 to It moves up the dynamic check lock lever that is able to drive to swing around pin 37, tapered end 310 is made to be rocked to the lower section of right guide rail 22.When installation, by mandril 31 lower end is perforated across mandril, and preceding check lock lever 34 and rear check lock lever 35 are perforated across check lock lever, and mandril perforation can be to mandril 31 are oriented to.
Gas-filling cabinet further includes the fixation bracket 2 being fixed on Inflatable cabinet body 5, and fixed bracket 2 includes left rail 21 With right guide rail 22, left rail 21 and right guide rail 22 are L shaped plate shape structure, are respectively arranged on the guide rail of L shaped plate shape left solid Fixed board 23 and right fixed plate 24.Wherein the end of 24 the same end of left fixed plate 23 and right fixed plate has outside segmental arc 29, There is gap 210 in the top at the end simultaneously.The vertical edge of left fixed plate 23 and left rail 21 constitutes left card slot, right fixed plate 24 and the vertical edge of right guide rail 22 constitute right card slot.Left card slot and right card slot can be such that snap-gauge 14 is caught in, to circuit breaker cradle 1 The position of left and right directions when moving on fixed bracket 2 is limited, and prevents circuit breaker cradle 1 from moving in left-right direction.Arc Shape section 29 can facilitate circuit breaker cradle to enter between left rail 21 and right guide rail 22, and gap 210 can facilitate snap-gauge 14 along preceding Rear direction is caught in card slot.
Arranged for interval has jacking block 25 and block perforation 28 in left-right direction on right guide rail 22, also opens up on right guide rail 22 There is locking rod aperture 26 and tapered end hole 27, locks rod aperture 26 and tapered end hole 27 communicates and locks before rod aperture 26 is located at tapered end hole 27 Side.The outer diameter in tapered end hole 27 is greater than the outer diameter of tapered end, and the outer diameter of locking rod aperture 26 is greater than the outer diameter of check lock lever and is less than tapered end Outer diameter.Jacking block 25 is located at middle position along the longitudinal direction.Tapered end hole 27 can be such that tapered end 310 is rocked under right guide rail 22 Side locks the lower opening of rod aperture 26 along the step surface block cooperation in the height direction that can be formed with check lock lever and tapered end, in turn It fixes release unit in the position of short transverse, release unit is made not generate upward displacement in use. The upper surface of jacking block 25 is along the direction that release unit is pushed into extension and acclivitous inclined-plane, in use, the inclined-plane and top The lower end wedge surface of bar is slidably matched, and gradually rises mandril 31.In left-right direction due to jacking block, locking rod aperture and block perforation 28 Arranged for interval, when use, will not influence the push-in of release unit.
Locks are fixed on the downside of one end (i.e. rear end) of the close gas-filling cabinet cabinet door of left rail 21 and right guide rail 22 Tight part 4, front and back locking member includes left fixing seat 43 and right fixing seat 44, and fixing seat is U-shaped structure, and fixing seat is mounted on left rail 21 and right guide rail 22 on.It is fixed with baffle 45 in fixing seat, guide rod 46 is coated in baffle 45, fixing seat, guide rod 46 Block 412 is installed, block 412, which has, to be extended along release unit push-in direction (i.e. from back to front) and tilt upwards on upper end Inclined-plane.Fixing seat is stretched out in the lower end of guide rod 46, and rivet 47, the bottom surface of rivet 47 and fixing seat are radially coated on guide rod 46 Between be pressed with guide rod reset spring 48.Rivet 47 is located at the lower section of baffle 45.Pull rod 49 is connected between left and right guide rod, Pull rod 49 is connected with left and right guide rod by guide rod pin 410 and guide rod block card 411.
In use, by release unit by being pushed into from back to front outside gas-filling cabinet when, 15 contact blocks 412 of idler wheel it is oblique Face makes guide rod 46 generate downward displacement, allows open walk for the push-in of release unit.After idler wheel 15 is pushed into, block 412 exists It is ejected again under the action of guide rod reset spring 48, after release unit is installed in place, by block 412 and Inflatable cabinet body Effect limiting circuit breaker device be displaced in the front-back direction.When needing release unit by pulling out in gas-filling cabinet, pull rod is pulled 49, it moves down block 412 and allows open walk for the pull-out of release unit.When release, check lock lever reset spring 39 drives lock By showing on the downside of right guide rail, the height of release unit is fixed in releasing for tight bar and tapered end backswing.
The schematic diagram of height fixing piece and front and back locking member when Fig. 8 is installed in place for release unit, at this point, tapered end 310 The height and position of release unit is fixed in downside block cooperation with right guide rail, and block 412 ejects, and fills to breaker The front-rear position set is fixed, and prevents release unit from deviating from front to back.Fig. 9 is showing when release unit is not pushed into place It is intended to, as seen from the figure, rear check lock lever 35 and tapered end 310 are still located on the top of right guide rail.Figure 10 pushes away for release unit Schematic diagram when entering in place, at this point, mandril 31 is located at highest position, tapered end 310 is located at the lower section of right guide rail and and check lock lever The lower opening in hole cooperates along block, and block 412 is maintained at the position ejected upwards.
In the present embodiment, side plate 13 and support column 36 together constitute mechanism rack, in the present embodiment, mechanism rack one It is set on side plate 13, in other embodiments, a connected mechanism rack can be retightened on side plate 13.
In the present embodiment, mandril is pushing tow structure.In the present embodiment, it is by the oblique of mandril and jacking block that wedge surface, which is slidably matched, What face was completed, in other embodiments, can be in the square structure that inclined-plane is arranged in the lower end of mandril and keeps jacking block common, it can also It is slidably matched with completing wedge surface.
In the present embodiment, right guide rail is jam plate.The step surface of tapered end is auxiliary section.In the present embodiment, rod aperture is locked As diameter holes, tapered end hole are large diameter hole.In the present embodiment, large diameter hole and diameter holes are opened up on jam plate and are got over for tapered end swing It crosses and cooperates with diameter holes hole along block.In other embodiments, large diameter hole and diameter holes can be cancelled, in Fig. 2 large diameter hole and The position of jam plate where diameter holes is opened wide completely, makes the step surface of tapered end directly by under the exterior oscillations to jam plate of jam plate Side.
In the present embodiment, connecting rod, check lock lever, tapered end quantity be two and arranged for interval along the longitudinal direction, in other realities It applies in example, can only retain wherein one group of locking member, it, can be by mandril, locking when retaining one group of locking member of rear side Bar, tapered end are arranged on same straight line along the longitudinal direction.
In the present embodiment, height retaining mechanism includes jam plate, height fixing piece 3 and mechanism rack, in other embodiments, It can not include jam plate, and the support plate of Inflatable cabinet body itself is used to use as jam plate.
In the present embodiment, release unit includes that circuit breaker cradle, the pole on circuit breaker cradle and height are locked Mechanism.
The specific embodiment of release unit of the present invention height retaining mechanism, release unit height retaining mechanism Structure is consistent with the structure of above-described embodiment, and details are not described herein for content.
The specific embodiment of release unit of the present invention, release unit include pole, circuit breaker cradle and height Retaining mechanism, structure is consistent with the structure of above-described embodiment, and details are not described herein for content.

Claims (7)

1. a kind of release unit height retaining mechanism, it is characterised in that: including for the breaker branch with release unit The mechanism rack that frame is fixedly linked, the mechanism rack are equipped with the lever that can be swung up and down, and one end of the lever is equipped with lock Tight bar, the lever be equipped with for when release unit moves from back to front with cabinet on jam plate wedge surface be slidably matched so that The lower end of the pushing tow structure that the check lock lever is swung, check lock lever is equipped with for crossing the lock in the downward swing process of check lock lever The tapered end of plate, the tapered end has can be with the downside of jam plate along the auxiliary section that short transverse block cooperates;Height retaining mechanism Including the jam plate, the jam plate is equipped with the large diameter hole swung by downwards for tapered end and the path on front side of large diameter hole Hole, the apertures of the diameter holes are greater than the outer diameter of check lock lever and are less than the outer diameter of tapered end, and the diameter holes, which have, to be used for and tapered end The auxiliary section along the vertical direction block cooperation lower opening edge.
2. release unit according to claim 1 height retaining mechanism, it is characterised in that: height retaining mechanism includes Lever described in two, pushing tow structure are the mandril that one end end corresponding with two levers is connected simultaneously, the mandril and lock Tight bar is staggeredly arranged in the longitudinal direction.
3. release unit height retaining mechanism described in any one according to claim 1 ~ 2, it is characterised in that: the thick stick Bar is equipped with the reset spring for driving tapered end backswing and the jam plate to be detached from.
4. a kind of release unit, it is characterised in that: including circuit breaker cradle, height is fixed on the circuit breaker cradle and is locked Mechanism, the height retaining mechanism include the mechanism rack being fixedly linked with circuit breaker cradle, and the mechanism rack is equipped with can The lever swung up and down, one end of the lever are equipped with check lock lever, the lever be equipped with for release unit from back to front It is slidably matched with the jam plate wedge surface on cabinet so that the pushing tow structure that the check lock lever is swung, the lower end of check lock lever is equipped with when mobile For crossing the tapered end of the jam plate in the downward swing process of check lock lever, the tapered end has can be with the downside of jam plate along height Spend the auxiliary section of direction block cooperation;Height retaining mechanism includes the jam plate, and the jam plate is equipped with for tapered end to lower swing By large diameter hole and the diameter holes on front side of large diameter hole, the apertures of the diameter holes be greater than the outer diameter of check lock lever and be less than lock The outer diameter of head, the diameter holes have for the lower opening edge that block cooperates along the vertical direction of the auxiliary section with tapered end.
5. release unit according to claim 4, it is characterised in that: height retaining mechanism includes thick stick described in two Bar, pushing tow structure are the mandril that one end end corresponding with two levers is connected simultaneously, and the mandril and check lock lever are in front and back It is staggeredly arranged upwards.
6. a kind of gas-filling cabinet, including release unit, it is characterised in that: the release unit includes circuit breaker cradle, described Height retaining mechanism is fixed on circuit breaker cradle, the height retaining mechanism includes the mechanism being fixedly linked with circuit breaker cradle Bracket, the mechanism rack are equipped with the lever that can be swung up and down, and one end of the lever is equipped with check lock lever, and the lever is equipped with For being slidably matched with the jam plate wedge surface on cabinet when release unit moves from back to front so that the check lock lever was swung Pushing tow structure, the lower end of check lock lever are equipped with the tapered end for crossing the jam plate in the downward swing process of check lock lever, the lock Head has can be with the downside of jam plate along the auxiliary section that short transverse block cooperates;Height retaining mechanism includes the jam plate, The jam plate is equipped with the large diameter hole swung by downwards for tapered end and the diameter holes on front side of large diameter hole, the hole of the diameter holes Diameter is greater than the outer diameter of check lock lever and is less than the outer diameter of tapered end, and the diameter holes have for the auxiliary section with tapered end vertically The lower opening edge of direction block cooperation.
7. gas-filling cabinet according to claim 6, it is characterised in that: height retaining mechanism includes lever described in two, top Selection structure is the mandril that one end end corresponding with two levers is connected simultaneously, and the mandril and check lock lever are wrong in the longitudinal direction Open arrangement.
CN201710250345.6A 2017-04-17 2017-04-17 A kind of gas-filling cabinet, release unit and its height retaining mechanism Active CN106877183B (en)

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CN201710250345.6A CN106877183B (en) 2017-04-17 2017-04-17 A kind of gas-filling cabinet, release unit and its height retaining mechanism

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Application Number Priority Date Filing Date Title
CN201710250345.6A CN106877183B (en) 2017-04-17 2017-04-17 A kind of gas-filling cabinet, release unit and its height retaining mechanism

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CN106877183B true CN106877183B (en) 2019-03-19

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Publication number Priority date Publication date Assignee Title
CN110932133B (en) * 2019-11-04 2021-11-16 衢州学院 Auxiliary frame for electric power cabinet installation

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CN1555598A (en) * 2001-10-22 2004-12-15 Mounting structure for an electric switch
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CN201774173U (en) * 2010-06-30 2011-03-23 北京人民电器厂有限公司 Draw-out position locking mechanism
CN202978074U (en) * 2012-12-20 2013-06-05 丽水万控电气有限公司 Safety interlocking lead rail device
CN104167682A (en) * 2014-08-06 2014-11-26 安徽龙波电气有限公司 Circuit breaker handcart and earthing switch interlocking device
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