CN111847206A - High heavy-load escalator step of security - Google Patents
High heavy-load escalator step of security Download PDFInfo
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- CN111847206A CN111847206A CN202010736801.XA CN202010736801A CN111847206A CN 111847206 A CN111847206 A CN 111847206A CN 202010736801 A CN202010736801 A CN 202010736801A CN 111847206 A CN111847206 A CN 111847206A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B23/00—Component parts of escalators or moving walkways
- B66B23/08—Carrying surfaces
- B66B23/12—Steps
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- Escalators And Moving Walkways (AREA)
Abstract
The invention discloses a high-safety heavy-load escalator step, relates to the relevant field of heavy-load escalators, and aims to solve the problem that different ring molds cannot be selected to correspond to different materials in the prior art, and the service life of the ring molds is short. The device is provided with first groove piece in the main part, first groove piece is provided with a plurality ofly, and is a plurality of first groove piece is linear as the standard with the radial sideline of device main part and arranges, adjacent two distance between the first groove piece sets up to unanimous, first groove piece is connected through argon arc welding with the device main part, one side of first groove piece is provided with the second groove piece, the second groove piece is provided with a plurality ofly, and is a plurality of the second groove piece is linear as the standard with the radial sideline of device main part and arranges, adjacent two distance between the second groove piece sets up to unanimous, the second groove piece is connected through argon arc welding with the device main part, be provided with the pressure release groove on the second groove piece, the pressure release groove is provided with two.
Description
Technical Field
The invention relates to the related field of heavy-load escalators, in particular to a heavy-load escalator step with high safety.
Background
The urban traffic problem is increasingly prominent at present, and public transportation mode has more and more become the first choice of citizens' trip, and this has bigger demand to public type staircase. Although the public transportation type escalator provides much convenience for people to go out, the safety of the public transportation type escalator also draws media and social attention. The global elevator enterprises have increased technical investment to develop high-performance and high-reliability escalators, but a series of researches have found that people still have insufficient attention to higher-performance heavy-load steps.
The national standard GB16899-2011 'safety standard for manufacturing and installing escalators and moving sidewalks' clearly indicates that public transportation type escalators can adapt to 140 hours per week, and in any 3-hour interval, the continuous heavy load is not less than 0.5 hour, and the load reaches 100% of braking load; although GB16899-2011 indicates that the public transportation type cannot be used as a fixed staircase even in a non-operating state, in a special case (such as a fire) the escalator is used for emergency evacuation of passengers, so that an enterprise must carry out heavy-duty design on the fatigue strength of the steps in the actual manufacturing process. Relevant safety standards have been established at home and abroad to require that heavy-load steps can meet corresponding bearing capacity under static braking load, such as 306 Kg/step specified in the United states.
The existing heavy-load escalator steps have the problems of poor strength and stability and difficulty in adapting to market demands; therefore, the market is urgently in need of developing a personal information acquisition device of a record signing system to help people to solve the existing problems.
Disclosure of Invention
The invention aims to provide a heavy-load type escalator step with high safety, and aims to solve the problems that the strength and the stability are poor and the market demand is difficult to adapt to in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a high-safety heavy-load escalator step comprises a device main body, wherein a plurality of first groove pieces are arranged on the device main body in a linear mode by taking a radial sideline of the device main body as a standard, the distance between every two adjacent first groove pieces is set to be consistent, the first groove pieces are connected with the device main body through argon arc welding, a second groove piece is arranged on one side of each first groove piece and provided with a plurality of second groove pieces, the second groove pieces are arranged in a linear mode by taking the radial sideline of the device main body as a standard, the distance between every two adjacent second groove pieces is set to be consistent, the second groove pieces are connected with the device main body through argon arc welding, pressure relief grooves are arranged on the second groove pieces and provided with two pressure relief grooves which are set to be triangular, and the length of each pressure relief groove is set to be consistent with the radial length of the device main body, and the first groove pieces are provided with pressure relief grooves.
Preferably, the inner side of the device main body is provided with two side plates, the side plates are attached to the inner wall of the device main body, the side plate is connected with the device main body through argon arc welding, a hollow groove is arranged on the side plate, the hollow groove is in a round hole-like shape, the depth of the hollow grooves is consistent with the thickness of the side plate, two hollow grooves are arranged, the front ends of the hollow grooves are provided with first connecting ribs, the first connecting ribs are arranged in a rectangular strip shape, two first connecting ribs are arranged, the first connecting ribs and the device main body are integrated, the first connecting ribs and the side plates are integrated, the rear ends of the first connecting ribs are provided with second connecting ribs, the second connecting rib is arranged into a rectangular strip shape, the second connecting rib and the device main body are integrated, and the second connecting rib and the side plate are integrated.
Preferably, the second connecting rib is provided with an inserting pipe, the inserting pipe is arranged in a circular tube shape, the inserting pipe and the second connecting rib are arranged in a whole shape, a clamping groove is formed in the inserting pipe, the clamping groove is arranged in a circular truncated cone shape, a limiting groove is formed in one side of the clamping groove, the limiting groove is arranged in a circular hole groove, and the diameter of the limiting groove is smaller than the minimum diameter of the clamping groove.
Preferably, the lower extreme of grafting pipe is provided with the switching cover, the switching cover sets up to the ring form, the switching cover is connected through the second splice bar with the grafting pipe, the inside of switching cover is provided with the switching groove, the switching groove sets up to the round hole form, the rear end of switching cover is provided with first backplate, first backplate and curb plate fixed connection, first backplate and switching cover fixed connection, the lower extreme of first backplate is provided with the cavity, the lower extreme of cavity is provided with the second backplate, second backplate and curb plate fixed connection, second backplate and switching cover fixed connection.
Preferably, the rear end of second backplate is provided with the rotation connector, it sets up to the unity with the curb plate to rotate the connector, it includes first dashpot to rotate the connector, first dashpot sets up to the four corners trough-like, the degree of depth of first dashpot sets up to unanimous with the width of first backplate, the front end of first dashpot is provided with the second dashpot, the degree of depth of second dashpot sets up to unanimous with the width of first backplate, the rear end of second dashpot is provided with the connecting pipe, the connecting pipe sets up to the unity with the curb plate.
Preferably, one side of connecting pipe is provided with the connection piece, be provided with the erection column on the connection piece, the erection column sets up to an organic whole with the connection piece, the inside of erection column sets up the mounting groove, the mounting groove sets up to the thread groove, the inside of mounting groove sets up self-tapping screw, self-tapping screw sets up to clearance fit with the inside screw thread of mounting groove, the outside of erection column is provided with the snap ring, the snap ring sets up to the laminating with the erection column, the outside of snap ring is provided with the fixed disk, the fixed disk sets up to the laminating with the snap ring.
Preferably, be provided with fixed cover on the fixed disk, fixed cover sets up to an organic whole with the fixed disk, one side of fixed disk is provided with the block, the block sets up to the laminating with the erection column, the block sets up to an organic whole with the connecting pipe.
Preferably, one side of the side plate is provided with a plurality of ribs which are linearly arranged, the side plate is connected with the ribs and provided with reinforcing columns, and the ribs are connected with the side plate through the reinforcing columns.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the arrangement of the rotary connecting head, when a user uses the heavy-duty escalator step, the user can make the whole heavy-duty escalator step be suitable for escalators of 30 degrees or below compared with the common heavy-duty escalator step in the market through the arrangement of the rotary connecting head, and meanwhile, the connecting strength at the position of the support can be increased, and meanwhile, the whole step has the function of collapse prevention;
2. according to the arrangement of the pressure relief groove, the first groove piece and the second groove piece, when a user uses the heavy-duty escalator step, the user can better prevent skidding when the whole escalator is used through the alternating arrangement of the first groove piece and the second groove piece, and meanwhile, through the arrangement of the pressure relief groove, the pressure applied to the groove pieces can be better guided when the whole escalator is used;
3. according to the invention, through the arrangement of the device main body, a user can improve the strength of the whole step through the ribs and the reinforcing columns arranged on the inner side of the device main body in the process of being suitable for the heavy-load escalator step, and simultaneously can reduce the deformation after being stressed to a certain degree, so that the service life of the whole heavy-load escalator step is further prolonged.
Drawings
Fig. 1 is a rear view structural view of a high safety heavy load type escalator step of the present invention;
fig. 2 is a side view structural view of a high safety heavy-duty escalator step of the present invention;
FIG. 3 is a cross-sectional view of the rotatable connection head of the present invention;
FIG. 4 is a top view of the high safety heavy duty escalator step of the present invention;
FIG. 5 is a cross-sectional structural view of the insertion tube of the present invention.
In the figure: 1. a device main body; 2. a first slot piece; 3. a second slot piece; 4. a pressure relief groove; 5. a side plate; 6. engraving grooves; 7. a first connecting rib; 8. a second connecting rib; 9. inserting a pipe; 10. a clamping groove; 11. a limiting groove; 12. a transfer sleeve; 13. a transfer groove; 14. a first guard plate; 15. a cavity; 16. a second guard plate; 17. rotating the connector; 18. a first buffer tank; 19. a second buffer tank; 20. connecting sheets; 21. a connecting pipe; 22. fixing the disc; 23. fixing a sleeve; 24. clamping a ring; 25. mounting a column; 26. a clamping block; 27. mounting grooves; 28. a self-tapping screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, an embodiment of the present invention is shown: a high-safety heavy-load type escalator step comprises a device main body 1, wherein a first groove piece 2 is arranged on the device main body 1, a plurality of first groove pieces 2 are arranged, the first groove pieces 2 are linearly arranged by taking a radial sideline of the device main body 1 as a standard, the distance between every two adjacent first groove pieces 2 is consistent, the first groove pieces 2 are connected with the device main body 1 through argon arc welding, a second groove piece 3 is arranged on one side of each first groove piece 2, a plurality of second groove pieces 3 are arranged, the second groove pieces 3 are linearly arranged by taking the radial sideline of the device main body 1 as a standard, the distance between every two adjacent second groove pieces 3 is consistent, the second groove pieces 3 are connected with the device main body 1 through argon arc welding, a pressure relief groove 4 is arranged on each second groove piece 3, two pressure relief grooves 4 are arranged, the pressure relief grooves 4 are triangular, the length of the pressure relief grooves 4 is consistent with the radial length of the device main body 1, the first slot pieces 2 are provided with pressure relief slots 4.
Further, the inboard of device main part 1 is provided with curb plate 5, curb plate 5 is provided with two, curb plate 5 laminates in the inner wall of device main part 1, curb plate 5 passes through argon arc welding with device main part 1 and is connected, be provided with fretwork groove 6 on the curb plate 5, fretwork groove 6 sets up to type round hole form, the degree of depth in fretwork groove 6 sets up to unanimously with the thickness of curb plate 5, fretwork groove 6 is provided with two, the front end in fretwork groove 6 is provided with first splice bar 7, first splice bar 7 sets up to rectangular strip, first splice bar 7 is provided with two, first splice bar 7 sets up to an organic whole with device main part 1, first splice bar 7 sets up to an organic whole with curb plate 5, the rear end of first splice bar 7 is provided with second splice bar 8, second splice bar 8 sets up to rectangular strip, second splice bar 8 sets up to an organic whole with device main part 1, second splice bar 8 sets up to an organic whole with curb plate.
Further, be provided with grafting pipe 9 on the second splice bar 8, grafting pipe 9 sets up to the pipe form, and grafting pipe 9 sets up to the bodily form with second splice bar 8, and the inside of grafting pipe 9 is provided with joint groove 10, and joint groove 10 sets up to the round platform form, and one side of joint groove 10 is provided with spacing groove 11, and spacing groove 11 sets up to the round hole groove, and the diameter of spacing groove 11 is less than the minimum diameter of joint groove 10.
Further, the lower extreme of grafting pipe 9 is provided with switching cover 12, switching cover 12 sets up to the ring form, switching cover 12 is connected through second splice bar 8 with grafting pipe 9, the inside of switching cover 12 is provided with switching groove 13, switching groove 13 sets up to the round hole form, the rear end of switching cover 12 is provided with first backplate 14, first backplate 14 and 5 fixed connection of curb plate, first backplate 14 and switching cover 12 fixed connection, the lower extreme of first backplate 14 is provided with empty cavity 15, the lower extreme of empty cavity 15 is provided with second backplate 16, second backplate 16 and 5 fixed connection of curb plate, second backplate 16 and switching cover 12 fixed connection.
Further, the rear end of the second guard plate 16 is provided with a rotary connector 17, the rotary connector 17 and the side plate 5 are arranged into a whole, the rotary connector 17 comprises a first buffer groove 18, the first buffer groove 18 is arranged into a four-corner groove shape, the depth of the first buffer groove 18 is consistent with the width of the first guard plate 14, the front end of the first buffer groove 18 is provided with a second buffer groove 19, the depth of the second buffer groove 19 is consistent with the width of the first guard plate 14, the rear end of the second buffer groove 19 is provided with a connecting pipe 21, and the connecting pipe 21 and the side plate 5 are arranged into a whole.
Further, one side of connecting pipe 21 is provided with connection piece 20, be provided with erection column 25 on connection piece 20, erection column 25 sets up to an organic whole with connection piece 20, the inside of erection column 25 sets up mounting groove 27, mounting groove 27 sets up to the thread groove, the inside of mounting groove 27 sets up self-tapping screw 28, self-tapping screw 28 sets up to clearance fit with the inside screw thread of mounting groove 27, the outside of erection column 25 is provided with snap ring 24, snap ring 24 sets up to the laminating with erection column 25, the outside of snap ring 24 is provided with fixed disk 22, fixed disk 22 sets up to the laminating with snap ring 24.
Furthermore, the fixed disk 22 is provided with a fixed sleeve 23, the fixed sleeve 23 and the fixed disk 22 are integrally formed, one side of the fixed disk 22 is provided with an engaging block 26, the engaging block 26 and the mounting column 25 are attached, and the engaging block 26 and the connecting pipe 21 are integrally formed.
Further, one side of curb plate 5 is provided with the muscle piece, and the muscle piece is provided with a plurality ofly, and a plurality of muscle pieces are linear arrangement, and curb plate 5 is provided with the enhancement post with being connected of muscle piece, and the muscle piece passes through the enhancement post with curb plate 5 and is connected.
TABLE 1 index difference table for new step and common step
The working principle is as follows: when the heavy-duty escalator step is used, the whole high-safety heavy-duty escalator step is firstly checked, a user can start to use after confirming that the check is correct, the user can install the rotating shaft in the transfer groove 13, after confirming that the installation is finished, the escalator support column is inserted into the insertion tube 9, the escalator support column is limited through the limiting groove 11, finally the connection of the driving wheel is completed through the connecting sheet 20, after confirming that the connection is finished, the heavy-duty escalator step can be used, when the heavy-duty escalator step is used, the whole heavy-duty escalator step can be suitable for the escalators with the angle of 30 degrees and below 30 degrees compared with the common heavy-duty escalator step in the market through the arrangement of the rotating connecting head 17, meanwhile, the connection strength at the position of the support can be increased, and meanwhile, the whole step has the function of collapse prevention, meanwhile, the first groove pieces 2 and the second groove pieces 3 can be arranged alternately, so that the whole escalator can be better prevented from skidding when being used, and meanwhile, the whole escalator can be better guided by pressure applied to the groove pieces when being used by arranging the pressure relief grooves 4, the strength of the whole stair is improved by the rib pieces and the reinforcing columns arranged on the inner side of the device main body 1, meanwhile, the deformation after stress can be reduced to a certain degree, and the service life of the whole heavy-load escalator stair is further prolonged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a high heavy load type staircase step of security, includes device main part (1), its characterized in that: the device is characterized in that a first groove piece (2) is arranged on the device main body (1), the first groove piece (2) is provided with a plurality of first groove pieces (2), the first groove pieces (2) are linearly arranged by taking the radial sideline of the device main body (1) as a standard, the distance between every two adjacent first groove pieces (2) is set to be consistent, the first groove pieces (2) are connected with the device main body (1) through argon arc welding, a second groove piece (3) is arranged on one side of each first groove piece (2), the second groove pieces (3) are provided with a plurality of second groove pieces (3), the second groove pieces (3) are linearly arranged by taking the radial sideline of the device main body (1) as a standard, the distance between every two adjacent second groove pieces (3) is set to be consistent, the second groove pieces (3) are connected with the device main body (1) through argon arc welding, and a pressure relief groove (4) is arranged on each second groove piece (3), the pressure relief groove (4) are provided with two, the pressure relief groove (4) is set to be triangular, the length of the pressure relief groove (4) is consistent with the radial length of the device main body (1), and the pressure relief groove (4) is formed in the first groove piece (2).
2. The high safety heavy duty escalator step of claim 1, further comprising: the inner side of the device main body (1) is provided with two side plates (5), the side plates (5) are attached to the inner wall of the device main body (1), the side plates (5) are connected with the device main body (1) through argon arc welding, the side plates (5) are provided with hollowed grooves (6), the hollowed grooves (6) are arranged to be similar to round holes, the depth of the hollowed grooves (6) is consistent with the thickness of the side plates (5), the hollowed grooves (6) are provided with two, the front ends of the hollowed grooves (6) are provided with first connecting ribs (7), the first connecting ribs (7) are arranged to be rectangular strips, the first connecting ribs (7) are arranged to be two, the first connecting ribs (7) are arranged to be integrated with the device main body (1), the first connecting ribs (7) are arranged to be integrated with the side plates (5), and the rear ends of the first connecting ribs (7) are provided with second connecting ribs (8), the second connecting rib (8) is arranged to be rectangular strip-shaped, the second connecting rib (8) and the device main body (1) are arranged to be integrated, and the second connecting rib (8) and the side plate (5) are arranged to be integrated.
3. A high safety heavy duty escalator step as claimed in claim 2, wherein: be provided with on second splice bar (8) and peg graft pipe (9), peg graft pipe (9) sets up to the pipe form, peg graft pipe (9) and second splice bar (8) set up to an organic whole, the inside of peg graft pipe (9) is provided with joint groove (10), joint groove (10) set up to the round platform form, one side of joint groove (10) is provided with spacing groove (11), spacing groove (11) set up to the round hole groove, the diameter of spacing groove (11) is less than the minimum diameter in joint groove (10).
4. A high safety heavy duty escalator step according to claim 3, further comprising: the lower extreme of grafting pipe (9) is provided with switching cover (12), switching cover (12) set up to the ring cover form, switching cover (12) are connected through second splice bar (8) with grafting pipe (9), the inside of switching cover (12) is provided with switching groove (13), switching groove (13) set up to the round hole form, the rear end of switching cover (12) is provided with first backplate (14), first backplate (14) and curb plate (5) fixed connection, first backplate (14) and switching cover (12) fixed connection, the lower extreme of first backplate (14) is provided with empty slot chamber (15), the lower extreme of empty slot chamber (15) is provided with second backplate (16), second backplate (16) and curb plate (5) fixed connection, second backplate (16) and switching cover (12) fixed connection.
5. A high safety heavy duty escalator step according to claim 4, wherein: the rear end of second backplate (16) is provided with rotates connector (17), it sets up to the unity with curb plate (5) to rotate connector (17), it includes first dashpot (18) to rotate connector (17), first dashpot (18) set up to the four corners trough-like, the degree of depth of first dashpot (18) and the width of first backplate (14) set up to unanimous, the front end of first dashpot (18) is provided with second dashpot (19), the degree of depth of second dashpot (19) and the width of first backplate (14) set up to unanimous, the rear end of second dashpot (19) is provided with connecting pipe (21), connecting pipe (21) set up to the unity with curb plate (5).
6. A high safety heavy duty escalator step according to claim 5, further comprising: one side of connecting pipe (21) is provided with connection piece (20), be provided with erection column (25) on connection piece (20), erection column (25) sets up to the unity with connection piece (20), the inside of erection column (25) sets up mounting groove (27), mounting groove (27) set up to the thread groove, the inside of mounting groove (27) sets up self-tapping screw (28), self-tapping screw (28) set up to clearance fit with the inside screw thread of mounting groove (27), the outside of erection column (25) is provided with clamping ring (24), clamping ring (24) set up to the laminating with erection column (25), the outside of clamping ring (24) is provided with fixed disk (22), fixed disk (22) set up to the laminating with clamping ring (24).
7. The high safety heavy duty escalator step of claim 6, further comprising: be provided with fixed cover (23) on fixed disk (22), fixed cover (23) set up to be integrative with fixed disk (22), one side of fixed disk (22) is provided with block (26), block (26) set up to the laminating with erection column (25), block (26) set up to be integrative with connecting pipe (21).
8. A high safety heavy duty escalator step as claimed in claim 2, wherein: the reinforcing rib is characterized in that a plurality of rib pieces are arranged on one side of the side plate (5), the plurality of rib pieces are linearly arranged, reinforcing columns are arranged on the side plate (5) and connected with the rib pieces, and the rib pieces are connected with the side plate (5) through the reinforcing columns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736801.XA CN111847206A (en) | 2020-07-28 | 2020-07-28 | High heavy-load escalator step of security |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736801.XA CN111847206A (en) | 2020-07-28 | 2020-07-28 | High heavy-load escalator step of security |
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| CN111847206A true CN111847206A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010736801.XA Pending CN111847206A (en) | 2020-07-28 | 2020-07-28 | High heavy-load escalator step of security |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1128021A (en) * | 1964-09-19 | 1968-09-25 | Massey Ferguson Gmbh | Improvements in combine harvesters |
| CN1173460A (en) * | 1996-05-30 | 1998-02-18 | 英万蒂奥股份公司 | Escalator step in aluminium die-casting |
| CN1923662A (en) * | 2005-08-31 | 2007-03-07 | 株式会社日立制作所 | Passenger conveyer |
| CN202790147U (en) * | 2012-08-30 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Axial positioning structure for upper automobile bearing |
| CN106379803A (en) * | 2016-10-28 | 2017-02-08 | 日立电梯（广州）自动扶梯有限公司 | Escalator safety step |
| CN206969980U (en) * | 2017-07-28 | 2018-02-06 | 重庆迈高电梯有限公司 | Escalator with step sagging induction installation |
| CN108726337A (en) * | 2017-04-24 | 2018-11-02 | 句容大为网络科技有限公司 | A kind of aluminium alloy step |
-
2020
- 2020-07-28 CN CN202010736801.XA patent/CN111847206A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1128021A (en) * | 1964-09-19 | 1968-09-25 | Massey Ferguson Gmbh | Improvements in combine harvesters |
| CN1173460A (en) * | 1996-05-30 | 1998-02-18 | 英万蒂奥股份公司 | Escalator step in aluminium die-casting |
| CN1923662A (en) * | 2005-08-31 | 2007-03-07 | 株式会社日立制作所 | Passenger conveyer |
| CN202790147U (en) * | 2012-08-30 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Axial positioning structure for upper automobile bearing |
| CN106379803A (en) * | 2016-10-28 | 2017-02-08 | 日立电梯（广州）自动扶梯有限公司 | Escalator safety step |
| CN108726337A (en) * | 2017-04-24 | 2018-11-02 | 句容大为网络科技有限公司 | A kind of aluminium alloy step |
| CN206969980U (en) * | 2017-07-28 | 2018-02-06 | 重庆迈高电梯有限公司 | Escalator with step sagging induction installation |
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Application publication date: 20201030 |