CN109458402A - A kind of running wheel mechanism of suspension type cover carriage - Google Patents
A kind of running wheel mechanism of suspension type cover carriage Download PDFInfo
- Publication number
- CN109458402A CN109458402A CN201811456855.XA CN201811456855A CN109458402A CN 109458402 A CN109458402 A CN 109458402A CN 201811456855 A CN201811456855 A CN 201811456855A CN 109458402 A CN109458402 A CN 109458402A
- Authority
- CN
- China
- Prior art keywords
- face
- axletree
- bearing
- step shaft
- shaft part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 21
- 230000007246 mechanism Effects 0.000 title claims abstract description 20
- 210000004907 gland Anatomy 0.000 claims description 36
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 241001133184 Colletotrichum agaves Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/063—Fixing them on the shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0078—Hubs characterised by the fixation of bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/061—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing mounting a plurality of bearings side by side
Abstract
The invention discloses a kind of running wheel mechanisms of suspension type cover carriage, axletree is Step Shaft, wheel is installed on axletree, bearing is provided between axletree and the wheel hub of wheel, the end of axletree passes through bearing, and axletree offers screw thread on the periphery of its end, and nut is connected on the screw thread of axletree, nut pushes down one end of the inner ring of bearing, and the other end of bearing inner race is pressed on the step end face of axletree；One end of wheel is connected with boring cover, and boring cover lives one end face pressure of bearing outer ring, and the other end of bearing outer ring is pressed on wheel hub.The present invention carries out axially position using the one end of nut to the inner ring of bearing, the other end of the inner ring of bearing utilizes the step end face axially position of Step Shaft, it is to be threadedly engaged connection between nut and axletree, improve the axial force to bearing, promote the axial carrying capacity of wheel, preventing the loosening because of running wheel causes the deflection of running wheel to fall off, and reduces processing and the assembly difficulty of wheel.
Description
Technical field
The invention belongs to cover carriage fields, and in particular to a kind of running wheel mechanism of suspension type cover carriage.
Background technique
Currently, cover carriage is one of the capital equipment before being widely used in State of Blast Furnace.The major function of cover carriage is to need
Open and block up when operating, remove the tap drain lid being laid on sow, in order to other equipment complete corresponding opening and
It blocks up work.
All-hydraulic suspension type cover carriage be cover carriage ontology is hung on by four running wheels it is straight under tuyere platform
Line is walked on track, then is moved back and forth in orbit with oil cylinder driving wheel of walking to realize removing and answering for tap drain lid
Position.Cover carriage during the work time, needs to weigh about the distance of the mobile about 4000mm of operculum colpi of 16~18t, in mobile operculum colpi
In the process, because all-hydraulic suspension type cover carriage is to be hung on cover carriage ontology under tuyere platform by four running wheels
Straight line is walked on track, therefore inevitably generating causes because malformation, track laying flatness such as have differences at the reasons
Running wheel loosening, and then the deflection of running wheel is caused to fall off.
Summary of the invention
For the prior art, the present invention provides a kind of running wheel mechanisms of suspension type cover carriage, and its object is to anti-
Only because the loosening of running wheel causes the deflection of running wheel to fall off.
To solve the above problems, the present invention is resolved by the following technical programs:
A kind of running wheel mechanism of suspension type cover carriage, including axletree, the axletree is Step Shaft, on axletree
Wheel is installed, bearing is provided between the axletree and the wheel hub of wheel, the end of axletree passes through bearing；In axletree
Screw thread is offered on the periphery of its end, axletree is threaded with nut by described, and the nut is pressed on axis
It holds on an end face of inner ring, the other end of bearing inner race is pressed on the step end face of axletree；One end of the wheel connects
It is connected to boring cover, the boring cover is pressed on an end face of bearing outer ring, and the other end of bearing outer ring is pressed on wheel hub.
Further, gland is connected on the end face of the axletree, an end face of the gland is pressed on the one of nut
On end.
Further, it is fixedly connected between the gland and axletree by the first screw.
Further, the axletree successively includes first step shaft part, second step shaft part and third since end
Step shaft part, and the diameter of first step shaft part is less than the diameter of second step shaft part, the diameter of second step shaft part is less than the
The diameter of three-stepped shaft section；The bearing is set on second step shaft part, and the other end of bearing inner race is pressed on third platform
On the end face of rank shaft part.
Further, the screw thread is provided on first step shaft part, and the nut is connected on first step shaft part, spiral shell
Female one end is connected with the first projecting ring section, and first projecting ring section is pressed on an end face of bearing inner race；When the first of nut
When projecting ring section is pressed on an end face of bearing inner race, retention gap between the end face of nut and the end face of second step shaft part.
Further, groove is opened up on the end face of the first step shaft part of the axletree, an end face of the gland connects
It is connected to locating convex block, the groove cooperation of the locating convex block and first step shaft part end face；When an end face of gland is pressed on spiral shell
When on female one end, retention gap between the end face and groove floor of the locating convex block.
Further, one end of the boring cover is connected with the second projecting ring section, and second projecting ring section is pressed on bearing outer ring
A side end face on.
Further, there are two the bearings, retaining ring is provided between two bearings.
Further, the retaining ring includes inner shield ring and outer retaining ring, and the inner ring cooperation of the inner shield ring and two bearings is described
The cooperation of the outer ring of outer retaining ring and two bearings.
Further, it is fixedly connected between the boring cover and wheel by the second screw, is provided between boring cover and wheel
Adjust gasket.
Compared with prior art, the present invention at least has the advantages that axletree of the invention is Step Shaft, wheel
Wheel is installed on axis, bearing is provided between axletree and the wheel hub of wheel, after the end of axletree passes through bearing, in vehicle
Wheel shaft offers screw thread on the periphery of its end, and nut is connected on the screw thread of axletree, and such nut can be axis
One end of the inner ring held presses tightly against, and the other end of bearing inner race is pressed on the step end face of axletree；In wheel
One end be connected with boring cover, boring cover presses tightly against an end face of bearing outer ring, and the other end of bearing outer ring is pressed on wheel
On hub.The present invention carries out axially position using the one end of nut to the inner ring of bearing, and the other end of the inner ring of bearing utilizes step
The step end face axially position of axis is threadedly engaged connection between nut and axletree, greatly improves the axial direction to bearing
Active force, can not only promote the axial carrying capacity of wheel, and then prevent the loosening because of running wheel from leading to running wheel
Deflection falls off, and reduces processing and the assembly difficulty of wheel.
Further, gland is connected on the end face of axletree, an end face of gland is pressed on one end of nut, is utilized
Gland applies active force to the end face of nut and compresses nut.It designs through this structure, can further promote wheel
Axial carrying capacity, and then prevent the loosening because of running wheel from the deflection of running wheel being caused to fall off, while increasing mechanical fortune
Capable safety.
Further, it is fixedly connected between gland and axletree by the first screw, facilitates the disassembly of gland to install, favorably
In the maintenance of wheel mechanism.
Further, axletree successively includes first step shaft part, second step shaft part and third step since end
Shaft part, and the diameter of first step shaft part is less than the diameter of second step shaft part, the diameter of second step shaft part is less than third platform
The diameter of rank shaft part；Bearing is set on second step shaft part, because the diameter of second step shaft part is less than third Step Shaft
The diameter of section so the other end of bearing inner race can be pressed on the end face of third step shaft part, and then promotes moving trolley
Take turns the Stability and dependability of mechanism.
Further, screw thread is provided on first step shaft part, nut is connected on first step shaft part, and spiral shell
Female one end is connected with the first projecting ring section, and the first projecting ring section presses tightly against an end face of bearing inner race.Connect using by nut
It connects on first step shaft part, because the diameter of first step shaft part is less than the diameter of second step shaft part, can select
The bigger nut of thickness is connected on first step shaft part, and the first projecting ring section is connected on nut, the first bulge loop
Portion directly pushes down an end face of bearing inner race, and the benefit designed in this way is can effectively to increase the thickness of nut, and then improve
Nut prevents the loosening because of running wheel from the deflection of running wheel being caused to fall off the mechanical property of bearing axial force.When
When first projecting ring section of nut is pressed on an end face of bearing, retain between the end face of nut and the end face of second step shaft part
Gap, the purpose of retention gap are to ensure that the first projecting ring section of nut is tight by one end face pressure of bearing inner race, avoid nut end face
Dieback first projecting ring section caused by second step shaft part can not occur with the tight situation of one end face pressure of bearing inner race.
Further, groove is opened up on the end face of the first step shaft part of axletree, is connected in an end face of gland
Locating convex block, and the groove of locating convex block and first step shaft part end face cooperates, in gland toward the first step shaft part of axletree
End face on when installing, locating convex block can play the role of quickly positioning, and enable screw quickly to find screw hole accurately, separately
Outside, the setting of locating convex block increases the thickness of gland, and then can promote the mechanical property of gland, increases gland to nut
Axial bearing capacity.When an end face of gland is pressed on one end of nut, between the end face and groove floor of locating convex block
Retention gap, the purpose of retention gap are to ensure that gland compresses nut, not only prevent nut in this way because of stress in wheel operation
And the loosening generated, and the reinforcement effect axially fastened can also be played.
Further, it is connected with the second projecting ring section in one end of boring cover, the second projecting ring section is pressed on the side of bearing outer ring
On end face, boring cover can be effectively promoted to the axial force of the cycle surface of bearing using the second projecting ring section.
Further, there are two bearings, and retaining ring being provided between two bearings, retaining ring includes inner shield ring and outer retaining ring,
Inner shield ring and the inner ring of two bearings cooperate, and the outer ring of outer retaining ring and two bearings cooperates.Two bearing hoistings wheel mechanism it is steady
Qualitative and security performance.
Detailed description of the invention
Fig. 1 is the schematic diagram after wheel of the invention is installed；
Fig. 2 is car wheel structure schematic diagram of the invention；
Fig. 3 is wheel partial enlarged view of the invention.
In figure: 1- wheel；2- bearing；3- boring cover；4- gland；The first screw of 5-；6- nut；The second screw of 7-；Gear in 8-
Circle；The outer retaining ring of 9-；10- axletree；11- adjusts gasket；12- suspension type cover carriage ontology；The first projecting ring section of 13-；14- convex
Block；The second projecting ring section of 15-.
Specific embodiment
With reference to the accompanying drawing and specific embodiment, detailed explanation is made to the present invention.
It is mounted on the vehicle frame of suspension type cover carriage ontology 12 for wheel 1 as shown in Figure 1, every suspension type cover carriage ontology
Four groups of wheels are installed on 12.
As shown in Fig. 2, the present invention includes wheel 1, bearing 2, boring cover 3, gland 4, the first screw 5, nut 6, the second screw
7, inner shield ring 8, outer retaining ring 9 and axletree 10, axletree 10 are Step Shaft, and axletree 10 successively includes First since end
Rank shaft part, second step shaft part and third step shaft part, and the diameter of first step shaft part is less than the diameter of second step shaft part,
The diameter of second step shaft part is less than the diameter of third step shaft part.The bearing 2 there are two installations on second step shaft part, two
Bearing 2 is located in the wheel hub of wheel 1, and bearing 2 is set on second step shaft part, because the diameter of second step shaft part is less than
The diameter of third step shaft part, so the other end of 2 inner ring of bearing can be pressed on the end face of third step shaft part, in turn
Promote the Stability and dependability of running wheel mechanism.Inner shield ring 8 and outer retaining ring 9 are equipped between two bearings 2, wherein inner shield ring
8 inner hole is matched with the outer circle of axletree 10 (second step shaft part), and the outer circle of outer retaining ring 9 is matched with the inner hole of wheel 1；
Inner shield ring 8 and the inner ring of two bearings 2 match, and the outer ring of outer retaining ring 9 and two bearings 2 matches.
The axially position method of two bearings 2 passes through the step of axletree 10 close to a bearing 2 of third step shaft part
End face, the wheel hub end face of wheel 1 and inner shield ring 8, outer retaining ring 9 position, i.e. the inner ring close to a bearing 2 of third step shaft part
One end be pressed on the third step shaft part end face of axletree 10, the other end pass through 8 axially position of inner shield ring；Close to third platform
The wheel hub end face that one end of the outer ring of one bearing 2 of rank shaft part is pressed on wheel 1 carries out axially position, and the other end passes through outer gear
Circle 9 carries out axially position.A bearing 2 far from third step shaft part is fixed by inner shield ring 8, outer retaining ring 9 and nut 6, boring cover 3
Position, i.e., by 8 axially position of inner shield ring, the other end passes through spiral shell for one end of the inner ring of a bearing 2 far from third step shaft part
Female 6 axially positions；One end of the outer ring of a bearing 2 far from third step shaft part carries out axially position by outer retaining ring 9, separately
One end carries out axially position by boring cover 3.
Specifically, offering screw thread on first step shaft part, nut 6 is connected on first step shaft part, and in nut 6
One end be connected with the first projecting ring section 13, the first projecting ring section 13 is pressed on an end face of 2 inner ring of bearing.As shown in figure 3, working as
When first projecting ring section 13 of nut 6 is pressed on an end face of 2 inner ring of bearing, it is to be ensured that the end face of nut 6 and second step axis
Gap is remained between the end face of section, and the purpose of retention gap is to ensure that the first projecting ring section 13 of nut 6 by the inner ring of bearing 2
One end face pressure is tight, avoid 6 end face dieback of nut caused by second step shaft part the first projecting ring section 13 can not in bearing 2
The tight situation of one end face pressure of circle occurs.Boring cover 3, boring cover 3 and vehicle are connected on the side of 10 end face of axletree in wheel 1
It is fixedly connected between wheel 1 by the second screw 7, adjustment gasket 11 is provided between boring cover 3 and wheel 1；And one end of boring cover 3 connects
It is connected to the second projecting ring section 15, the second projecting ring section 15 is pressed on a side end face of 2 outer ring of bearing, i.e. boring cover 3 is by 2 outer ring of bearing
One side compression.In addition, boring cover 3 can also play the role of sealing while positioning bearing 2.
As shown in Figures 2 and 3, it is connected with gland 4 on the end face of axletree 10, passes through between gland 4 and axletree 10
First screw 5 is fixedly connected, and an end face of gland 4 is pressed on one end of nut 6.Specifically, in the First of axletree 10
Groove is opened up on the end face of rank shaft part, locating convex block 14, and locating convex block 14 and First are connected on an end face of gland 4
The groove cooperation opened up on rank shaft part end face, in gland 4 toward when installing on the end face of the first step shaft part of axletree 10, positioning
Convex block 14 can play the role of quickly positioning, and enable the first screw 5 quickly to find screw hole accurately, in addition, locating convex block
14 setting increases the thickness of gland 4, and then can promote the mechanical property of gland 4, increases gland 4 to the axial direction of nut 6
Bearing capacity.As shown in figure 3, when an end face of gland 4 is pressed on one end of nut 6, it is to be ensured that the end face of locating convex block 14
Gap is remained between groove floor, the purpose of retention gap is to ensure that gland 4 compresses nut 6, not only prevents spiral shell in this way
Mother 6 because in wheel operation stress due to the loosening that generates, and the reinforcement effect axially fastened can also be played.
To sum up, bearing 2 is used in groups by inner shield ring 8, outer retaining ring 9, and side is fixed using the wheel hub of axletree 10 and wheel 1
Position, the other side are positioned using boring cover 3 and nut 6.Nut 6, using being threadedly coupled, can adjust with axletree 10 by tightening nut 6
Position bearing 2.Gland 4 is connect with axletree 10 using the first screw 5, splice grafting contacting surface preset clearance, guarantees gland 4 and spiral shell
Mother 6 contact surface can contact and compress, prevent nut 6 because wheel run in stress due to generate loosening while, moreover it is possible to play
The reinforcement effect axially fastened.
Claims (10)
1. a kind of running wheel mechanism of suspension type cover carriage, it is characterised in that: including axletree (10), the axletree (10)
For Step Shaft, it is equipped with wheel (1) on axletree (10), is provided with axis between the axletree (10) and the wheel hub of wheel (1)
It holds (2), the end of the axletree (10) passes through bearing (2)；It is offered on the periphery of axletree (10) close to its end
Screw thread, axletree (10) are threaded with nut (6) by described, and the nut (6) is pressed on an end face of bearing (2) inner ring
On, the other end of bearing (2) inner ring is pressed on the step end face of axletree (10)；One end of the wheel (1) is connected with
Boring cover (3), the boring cover (3) are pressed on an end face of bearing (2) outer ring, and the other end of bearing (2) outer ring is pressed on wheel
On hub.
2. a kind of running wheel mechanism of suspension type cover carriage according to claim 1, it is characterised in that: the axletree
(10) it is connected on end face gland (4), an end face of the gland (4) is pressed on one end of nut (6).
3. a kind of running wheel mechanism of suspension type cover carriage according to claim 2, it is characterised in that: the gland
(4) it is fixedly connected between axletree (10) by the first screw (5).
4. a kind of running wheel mechanism of suspension type cover carriage according to claim 2, it is characterised in that: the axletree
It (10) successively include first step shaft part, second step shaft part and third step shaft part, and first step shaft part since end
Diameter be less than the diameter of second step shaft part, the diameter of second step shaft part is less than the diameter of third step shaft part；The axis
It holds (2) to be set on second step shaft part, the other end of bearing (2) inner ring is pressed on the end face of third step shaft part.
5. a kind of running wheel mechanism of suspension type cover carriage according to claim 4, it is characterised in that: the screw thread is opened
It is located on first step shaft part, the nut (6) is connected on first step shaft part, and it is convex that one end of nut (6) is connected with first
Ring portion (13), first projecting ring section (13) are pressed on an end face of bearing (2) inner ring；
When the first projecting ring section (13) of nut (6) is pressed on an end face of bearing (2) inner ring, the end face of nut (6) and the
Retention gap between the end face of two step shaft parts.
6. a kind of running wheel mechanism of suspension type cover carriage according to claim 4, it is characterised in that: the axletree
(10) groove is opened up on the end face of first step shaft part, an end face of the gland (4) is connected with locating convex block (14), described
Locating convex block (14) and the groove of first step shaft part end face cooperate；
When an end face of gland (4) is pressed on one end of nut (6), the end face of the locating convex block (14) and groove floor
Between retention gap.
7. a kind of running wheel mechanism of suspension type cover carriage according to claim 1, it is characterised in that: the boring cover
(3) one end is connected with the second projecting ring section (15), and second projecting ring section (15) is pressed on a side end face of bearing (2) outer ring
On.
8. a kind of running wheel mechanism of suspension type cover carriage according to claim 1, it is characterised in that: the bearing
(2) there are two, two bearings are provided with retaining ring between (2).
9. a kind of running wheel mechanism of suspension type cover carriage according to claim 8, it is characterised in that: the retaining ring packet
Include inner shield ring (8) and outer retaining ring (9), the inner ring cooperation of the inner shield ring (8) and two bearings (2), the outer retaining ring (9) and two axis
Hold the outer ring cooperation of (2).
10. a kind of running wheel mechanism of suspension type cover carriage according to claim 1, it is characterised in that: the boring cover
(3) it is fixedly connected between wheel (1) by the second screw (7), is provided with adjustment gasket between boring cover (3) and wheel (1)
(11)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456855.XA CN109458402A (en) | 2018-11-30 | 2018-11-30 | A kind of running wheel mechanism of suspension type cover carriage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456855.XA CN109458402A (en) | 2018-11-30 | 2018-11-30 | A kind of running wheel mechanism of suspension type cover carriage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109458402A true CN109458402A (en) | 2019-03-12 |
Family
ID=65612120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811456855.XA Pending CN109458402A (en) | 2018-11-30 | 2018-11-30 | A kind of running wheel mechanism of suspension type cover carriage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109458402A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110527764A (en) * | 2019-09-25 | 2019-12-03 | 中钢集团西安重机有限公司 | A kind of sliding rail, which breaks off relations, rotary lid-moving machine and its moves lid unhook method |
| CN113696955A (en) * | 2021-05-31 | 2021-11-26 | 平高集团有限公司 | Circuit breaker handcart and wheel assembly thereof |
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- 2018-11-30 CN CN201811456855.XA patent/CN109458402A/en active Pending
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| CN205168060U (en) * | 2015-11-20 | 2016-04-20 | 中国一冶集团有限公司 | Cold board car wheel subassembly of ring |
| CN107989911A (en) * | 2017-12-05 | 2018-05-04 | 安徽福马车桥有限公司 | A kind of automobile and its hub-bearing unit |
| CN209180245U (en) * | 2018-11-30 | 2019-07-30 | 中钢集团西安重机有限公司 | A kind of running wheel mechanism of suspension type cover carriage |
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| CN113696955A (en) * | 2021-05-31 | 2021-11-26 | 平高集团有限公司 | Circuit breaker handcart and wheel assembly thereof |
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