CN113998559B - Plunger assembly for elevator buffer and elevator buffer - Google Patents
Plunger assembly for elevator buffer and elevator buffer Download PDFInfo
- Publication number
- CN113998559B CN113998559B CN202010738269.5A CN202010738269A CN113998559B CN 113998559 B CN113998559 B CN 113998559B CN 202010738269 A CN202010738269 A CN 202010738269A CN 113998559 B CN113998559 B CN 113998559B
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- plunger
- bottom cover
- wall
- clamping groove
- elevator buffer
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- 239000000872 buffer Substances 0.000 title claims abstract description 42
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 description 7
- 239000011295 pitch Substances 0.000 description 7
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/28—Buffer-stops for cars, cages, or skips
- B66B5/282—Structure thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/28—Buffer-stops for cars, cages, or skips
Landscapes
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention belongs to the technical field of elevator buffers, and particularly relates to a plunger assembly for an elevator buffer, which comprises a plunger and a bottom cover, wherein the plunger is of a hollow structure with an opening at the bottom, the inner wall of the plunger is provided with a first clamping groove, and the outer wall of the bottom cover is provided with a second clamping groove; the plunger assembly further comprises a clamp spring, the clamp spring is contracted in the second clamping groove of the bottom cover under the action of external force, and when the bottom cover is inserted in a target position in the plunger, the part of the clamp spring is expanded into the first clamping groove of the plunger to connect the plunger and the bottom cover. According to the plunger assembly for the elevator buffer, the connection between the plunger and the bottom cover is realized by using the snap springs, so that compared with the threaded connection and welding of the existing plunger and the bottom cover, the processing can be reduced, and the assembly efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of elevator buffers, and particularly relates to a plunger assembly for an elevator buffer and the elevator buffer.
Background
After the elevator buffer is impacted by the stall car, the plunger moves downwards, and when the elevator buffer reaches the bottom of the adjusting rod through the variable cross section throttling effect of the bottom cover at the bottom of the plunger and the adjusting rod, the stall car stops, and the buffering process is finished.
The existing connection mode between the bottom cover and the plunger adopts a threaded connection or welding mode mostly, wherein the bottom cover and the throttle rod piece have high size requirements and lower processing efficiency due to the throttle effect.
Disclosure of Invention
Based on the above-mentioned shortcomings existing in the prior art, the present invention provides a plunger assembly for an elevator buffer and an elevator buffer.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The plunger assembly for the elevator buffer comprises a plunger and a bottom cover, wherein the plunger is of a hollow structure with an opening at the bottom, the inner wall of the plunger is provided with a first clamping groove, and the outer wall of the bottom cover is provided with a second clamping groove; the plunger assembly further comprises a clamp spring, the clamp spring is contracted in the second clamping groove of the bottom cover under the action of external force, and when the bottom cover is inserted in a target position in the plunger, the part of the clamp spring is expanded into the first clamping groove of the plunger to connect the plunger and the bottom cover.
Preferably, the inner wall of the plunger has a guide surface extending axially inward along the bottom opening thereof, so that the snap spring interacts with the guide surface to retract within the second catch groove of the bottom cover.
Preferably, the guide surface has a ring structure matching with the side surface of the round table.
Preferably, the caliber of the outermost side of the guide surface is not smaller than the outer diameter of the clamp spring in a free state.
Preferably, the first clamping groove of the inner wall of the plunger is positioned on the inner side of the guide surface.
As an optimal scheme, a sealing ring is arranged between the inner wall of the plunger and the outer wall of the bottom cover, and the sealing ring is in sealing fit between the guide surface of the plunger and the outer wall of the bottom cover.
Preferably, the outer wall of the bottom cap has a collar extending radially outwardly therefrom, and the bottom of the plunger abuts against the collar of the bottom cap.
Preferably, the first clamping groove is an annular groove extending outwards along the radial direction of the inner wall of the plunger.
Preferably, the second clamping groove is an annular groove extending inwards along the radial direction of the outer wall of the bottom cover.
As an optimal scheme, the number of the clamping springs is multiple, and the clamping springs are stacked in the first clamping groove of the plunger and the second clamping groove of the bottom cover.
The invention also provides an elevator buffer comprising a plunger assembly according to any one of the above aspects.
Compared with the prior art, the invention has the beneficial effects that:
according to the plunger assembly for the elevator buffer, the plunger and the bottom cover are fixedly connected by the clamp spring, so that compared with the threaded connection and welding of the existing plunger and the bottom cover, the processing can be reduced, and the assembly efficiency is improved.
The elevator buffer has high assembly efficiency.
Drawings
Fig. 1 is a schematic diagram of an elevator buffer according to a first embodiment of the present invention;
Fig. 2 is an axial partial cross-sectional view of an elevator buffer of an embodiment of the invention;
FIG. 3 is an enlarged view of section I of FIG. 2;
FIG. 4 is an enlarged view of section II of FIG. 3;
FIG. 5 is a schematic view of a spring seat according to a first embodiment of the present invention;
FIG. 6 is a schematic view of a spring seat according to another embodiment of the present invention;
Fig. 7 is a schematic structural view of a bracket according to a first embodiment of the present invention.
Fig. 8 is a schematic diagram of an elevator buffer according to a second embodiment of the present invention;
fig. 9 is an axial partial cross-sectional view of an elevator buffer of the second embodiment of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Embodiment one:
as shown in fig. 1 to 7, the plunger assembly for an elevator buffer of the present embodiment is applied to an elevator buffer.
Specifically, the elevator buffer includes an oil cylinder 1, a plunger assembly including a plunger 2 and a bottom cover 5, a reset mechanism, and a safety switch 4.
Specifically, the cylinder 1 of the present embodiment is installed above the base 0; the plunger 2 is a hollow structure with an opening at the bottom, and a bottom cover 5 is arranged at the opening at the bottom. The plunger 2 is inserted into the oil cylinder 1, so that the bottom cover 5 is positioned in the oil cylinder 1. As shown in fig. 3, the inner wall of the plunger 2 is provided with a first clamping groove 2a, and the first clamping groove 2a is an annular groove extending outwards along the radial direction of the inner wall of the plunger; the outer side wall of the bottom cover 5 is provided with a second clamping groove 5a, and the second clamping groove 5a is an annular groove extending inwards along the radial direction of the outer side wall of the bottom cover. The plunger 2 is fixedly connected with the bottom cover 5 through a second clamping spring 6, and the specific installation mode of the second clamping spring 6 is as follows: the second clamp spring 6 is contracted in the second clamping groove 5a of the bottom cover under the action of external force, when the bottom cover 5 is inserted in the target position in the plunger 2, the second clamp spring 6 is partially expanded into the first clamping groove 2a of the plunger, namely one side of the second clamp spring 6 is positioned in the first clamping groove 2a of the plunger, and the other side is positioned in the second clamping groove 5a of the bottom cover, so that the plunger 2 and the bottom cover 5 are fixed. The connection mode of the second clamp spring is adopted between the plunger and the bottom cover to replace welding or threaded connection in the prior art, so that machining can be reduced, and assembly efficiency is improved.
The inner wall of the plunger 2 of this embodiment has a guide surface 2b extending axially inward along the bottom opening thereof so that the second snap spring 6 interacts with the guide surface 2b of the plunger to retract within the second catch groove 5b of the bottom cover. The first clamping groove 2a of the inner wall of the plunger is positioned on the inner side of the guide surface 2b, so that the second clamping spring is clamped into the first clamping groove 2a after passing through the guide surface 2 b. The structure of the guiding surface 2b is an annular structure matched with the side surface of the round table, and the caliber of the outermost side of the guiding surface 2b is not smaller than the outer diameter of the second clamp spring 6 in a free state, so that the second clamp spring 6 can be conveniently assembled. The number of the second clamp springs is not limited to one, and the second clamp springs can be multiple, and the second clamp springs are stacked in the first clamping groove 2a of the plunger and the second clamping groove 5a of the bottom cover, so that the connection stability between the plunger and the bottom cover is improved.
A sealing ring 7 is installed between the inner wall of the plunger 2 and the outer side wall of the bottom cover 5 in the embodiment, and the sealing ring 7 is in sealing fit between the guide surface 2b of the plunger and the outer wall of the bottom cover 5. The outer wall of the bottom cover 5 is provided with a convex ring 5b extending outwards along the radial direction of the bottom cover, the bottom of the plunger 2 is propped against the convex ring 5b of the bottom cover, and the sealing ring 7 is in sealing contact with the guide surface 2b of the plunger, the outer wall of the bottom cover 5 and the convex ring 5b, so that oil in the plunger is prevented from entering the oil cylinder from an installation gap between the plunger and the bottom cover, and the buffering performance of the elevator buffer is influenced.
As shown in fig. 3 and 4, the outer side wall of the bottom cover 5 of the present embodiment has a limit groove 5c, and the limit groove 5c is located below the convex ring 5 b; a first clamping spring 8 is arranged in the limiting groove 5 c; correspondingly, the inner side wall of the oil cylinder 1 is provided with an anti-falling inclined plane 1a matched with the first clamp spring 8; when the plunger 2 is reset to the target position under the action of the reset mechanism, the first clamp spring 8 and the anti-falling inclined plane 1a of the oil cylinder are in extrusion interaction, so that the plunger 2 is limited to continue to move along the reset direction, the travel of the plunger is limited, and the plunger 2 is prevented from being separated from the oil cylinder 1 under the linkage of the reset mechanism. Specifically, the oil cylinder 1 sequentially comprises a main body part 1-1, an anti-falling inclined surface part 1-2 and an opening part 1-3 from bottom to top along the axial direction of the oil cylinder, wherein the inner diameter of the main body part 1-1 is larger than that of the opening part 1-3, the main body part 1-1 and the opening part 1-3 are in transition through the anti-falling inclined surface part 1-2, and particularly in linear transition through the anti-falling inclined surface part 1-2, or in arc transition; the limit groove 5c of the bottom cover is provided with a groove wall 5cc which sequentially approaches the inner wall of the oil cylinder from top to bottom along the axial direction of the plunger, and the diameter of the lowest position of the groove wall is matched with the inner diameter of the opening part 1-3 of the oil cylinder; when the first clamp spring 8 is positioned at the highest position of the groove wall, the diameter of the first clamp spring 8 in a free state is matched with the inner diameter of the main body part 1-1 of the oil cylinder, so that the first clamp spring 8 is prevented from falling out from a gap between the limiting groove and the main body part of the oil cylinder. In addition, the opening 1-3 of the oil cylinder of this embodiment has three seal grooves (the number of seal grooves is not limited to three, and the specific number can be adjusted according to actual needs) at intervals along the axial direction, and an O-ring 15 is installed in the seal grooves to be in sealing fit with the plunger 2, so as to ensure the air tightness between the plunger and the oil cylinder.
The return mechanism of the present embodiment includes a spring seat 30, a first return spring 31, a bracket 32, a second return spring 33, and a pressure spring cover 34. The spring seat 30 is mounted on the outer side wall of the oil cylinder 1; the first return spring 31 is sleeved outside the oil cylinder 1 and abuts against the spring seat 30; the bracket 32 is sleeved outside the oil cylinder 1 and abuts against the first reset spring 31; the second return spring 33 is sleeved outside the plunger 2 and the oil cylinder 1 and abuts against the bracket 32; a pressure spring cover 34 is mounted on top of the plunger and abuts against the second return spring 33. Wherein the pitch of the first return spring 31 is smaller than the pitch of the second return spring 33.
The spring seat 30 of the embodiment is clamped outside the outer side wall of the oil cylinder 1; specifically, as shown in fig. 5 and 6, the spring seat 30 includes a first half ring 30a and a second half ring 30b, one end of the first half ring 30a is hinged to one end of the second half ring 30b, and the other end of the first half ring 30a and the other end of the second half ring 30b are detachably connected through bolt and bolt hole matching, so as to form a clamping cavity 300 in clamping fit with the oil cylinder 1; the detachable connection mode can also adopt the prior connection modes such as clamping connection, inserting connection and the like. In addition, as shown in fig. 3, the outer side wall of the oil cylinder 1 is provided with a mounting position 1b matched with a clamping cavity 300 of the spring seat, the outer diameter of the upper part of the mounting position 1b is smaller than that of the lower part of the mounting position 1b, the upper part and the lower part of the mounting position 1b are in cambered surface transition, and a limiting part 300a matched with the structure of the mounting position 1b is arranged in the clamping cavity 300 so as to limit the spring seat 30 to move downwards in the working process of the elevator buffer. The design of the spring seat solves the problem that the existing spring seat is deformed after being welded on the oil cylinder, stress treatment is not needed due to deformation, and the process is simplified.
In addition, the inner walls of the first half ring 30a and the second half ring 30b are respectively provided with a first flange 30aa and a second flange 30bb extending along the axial direction of the oil cylinder, and the bottoms of the first return springs 31 are tightly held by the first flange 30aa and the second flange 30bb, so that the buffering performance of the elevator buffer is improved. The first half ring 30a of the spring seat of the present embodiment has an outwardly extending mounting portion 30c, and the mounting portion 30c has a mounting hole for mounting the safety switch 4 without providing an additional mounting accessory for the safety switch.
As shown in fig. 7, the bracket 32 of this embodiment includes a circular ring main body 32a, a lower convex ring 32b with the inner ring of the circular ring main body extending downward, and an upper convex ring 32c with the outer ring of the circular ring main body extending upward, where the circular ring main body 32a is sleeved outside the oil cylinder 1, the top of the first return spring 31 is held tightly outside the lower convex ring 32b, and the bottom of the second return spring 33 is held tightly inside the upper convex ring 32c, so as to ensure the stability of the expansion and contraction of the first return spring and the second return spring. In addition, a triggering piece 9 is arranged on one side of the circular ring main body 32a of the bracket, which corresponds to the safety switch 4, and is used for triggering the safety switch 4. Specifically, the triggering piece 9 is a bending piece, and the bending piece is provided with a triggering inclined plane 9a corresponding to the safety switch, so that the reliability of triggering the safety switch is improved, and the safety of the elevator buffer is improved.
As shown in fig. 2 and 3, the side wall of the oil cylinder 1 of the present embodiment has three bolt holes of unequal heights, each of which is connected with an oil level detection bolt 10 in a sealing manner, so as to facilitate the detection of the oil level in the oil cylinder.
As shown in fig. 1 and 2, the top of the plunger 2 of the present embodiment is provided with an exhaust valve assembly 11, and the specific structure of the exhaust valve assembly 11 may refer to the prior art, which is not described herein. In addition, a cushion pad 12 is installed above the plunger 2 in this embodiment, the cushion pad 12 is embedded at the top of the plunger 2, and the cushion pad 12 is embedded with the top of the plunger 2 by a Z-shaped structure, so that the cushion pad is fixed on the plunger 2. Among them, the cushion pad is preferably made of rubber.
A dust cover 13 is installed between the plunger 2 and the top of the cylinder 1 in this embodiment to prevent interference of external foreign matters. Wherein the cushion pad 12 is located above the dust cap 13.
The oil cylinder and the plunger in the embodiment can be manufactured by adopting a spinning forming technology to spin-form a flat plate material into a cylindrical structure. The spinning forming technology is particularly suitable for forming the high-strength thin-wall cylindrical structure; the flat plate material adopts a material with higher strength to replace common steel, so that the material strength is higher, the small structure is used for replacing the large structure, and the whole mass can be lightened from the metal material.
Embodiment two:
the plunger assembly for an elevator buffer of this embodiment is different from that of the first embodiment in that: the elevator buffer of the present embodiment differs from the elevator buffer of the embodiment in the structure of the reset mechanism, which is applied to another elevator buffer.
Specifically, as shown in fig. 8 and 9, the return mechanism of the present embodiment includes a spring seat, return springs with unequal pitches and a pressure spring cover, the installation structure of the spring seat and the pressure spring cover is the same as that of the first embodiment, and one return spring 14 with unequal pitches is used to replace two return springs and a bracket of the first embodiment, so that the structure of the return mechanism is simplified. Wherein the pitch of the bottom of the non-equidistant return spring is smaller than the pitch of the top thereof; the trigger piece is fixed in the reset spring bottom of unequal pitch and not be located the spring coil of bottom, can realize safety switch's trigger, and sensitivity is higher. The structural diversification of the elevator buffer is realized to meet the requirements of different applications.
Other structures may be referred to in embodiment one.
Embodiment III:
the plunger assembly for an elevator buffer of this embodiment is different from that of the first embodiment in that:
The number of the second clamping springs can be multiple, and the second clamping springs are stacked in the first clamping grooves of the plunger and the second clamping grooves of the bottom cover, so that the connection stability between the plunger and the bottom cover is improved, and the requirements of different applications are met.
Other structures and structures of the elevator buffer can be referred to in the first embodiment.
Embodiment four:
the plunger assembly for an elevator buffer of this embodiment is different from that of the first embodiment in that:
The arrangement of the guide surface of the plunger is omitted, and although the installation of the second clamp spring is complicated, the forming process of the plunger is simplified so as to meet the requirements of different applications.
Other structures and structures of the elevator buffer can be referred to in the first embodiment.
The foregoing is only illustrative of the preferred embodiments and principles of the present invention, and changes in specific embodiments will occur to those skilled in the art upon consideration of the teachings provided herein, and such changes are intended to be included within the scope of the invention as defined by the claims.
Claims (5)
1. The plunger assembly for the elevator buffer comprises a plunger and a bottom cover, wherein the plunger is of a hollow structure with an opening at the bottom, and is characterized in that a first clamping groove is formed in the inner wall of the plunger, and a second clamping groove is formed in the outer wall of the bottom cover; the plunger assembly further comprises a clamp spring, the clamp spring is contracted into the second clamping groove of the bottom cover under the action of external force, and when the bottom cover is inserted into the target position in the plunger, part of the clamp spring expands into the first clamping groove of the plunger to connect the plunger and the bottom cover;
The inner wall of the plunger is provided with a guide surface extending inwards along the axial direction of the bottom opening of the plunger, so that the clamp spring interacts with the guide surface and is contracted in the second clamping groove of the bottom cover;
the guide surface is in an annular structure matched with the side surface of the round table;
the caliber of the outermost side of the guide surface is not smaller than the outer diameter of the clamp spring in a free state;
The first clamping groove of the inner wall of the plunger is positioned at the inner side of the guide surface;
a sealing ring is arranged between the inner wall of the plunger and the outer wall of the bottom cover, and the sealing ring is in sealing fit between the guide surface of the plunger and the outer wall of the bottom cover.
2. The plunger assembly of claim 1, wherein the outer wall of the bottom cap has a collar extending radially outwardly therefrom, and the bottom of the plunger abuts the collar of the bottom cap.
3. The plunger assembly for an elevator buffer as recited in claim 1, wherein said first detent is an annular groove extending radially outwardly of an inner wall of the plunger.
4. The plunger assembly for an elevator buffer as set forth in claim 1, wherein said second clamping groove is an annular groove extending radially inward from an outer wall of the bottom cover.
5. An elevator buffer comprising a plunger assembly according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738269.5A CN113998559B (en) | 2020-07-28 | 2020-07-28 | Plunger assembly for elevator buffer and elevator buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738269.5A CN113998559B (en) | 2020-07-28 | 2020-07-28 | Plunger assembly for elevator buffer and elevator buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113998559A CN113998559A (en) | 2022-02-01 |
| CN113998559B true CN113998559B (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010738269.5A Active CN113998559B (en) | 2020-07-28 | 2020-07-28 | Plunger assembly for elevator buffer and elevator buffer |
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| Country | Link |
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| CN (1) | CN113998559B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202687688U (en) * | 2012-07-17 | 2013-01-23 | 河北东方富达机械有限公司 | Oil buffer |
| JP2014012588A (en) * | 2012-07-04 | 2014-01-23 | Mitsubishi Electric Corp | Elevator shock absorber and return method for the same |
| CN203756846U (en) * | 2014-04-02 | 2014-08-06 | 上海青浦电梯配件有限公司 | Plunger-type hydraulic buffer |
| CN108178042A (en) * | 2017-12-01 | 2018-06-19 | 宁波奥德普电梯部件有限公司 | A kind of novel elevator buffer |
| CN207684690U (en) * | 2017-12-25 | 2018-08-03 | 广东华辉电梯配件有限公司 | A kind of Elevator hydraulic buffer |
| CN210884794U (en) * | 2019-07-29 | 2020-06-30 | 杭州沪宁电梯部件股份有限公司 | Hydraulic buffer |
| CN213112104U (en) * | 2020-07-28 | 2021-05-04 | 杭州沪宁电梯部件股份有限公司 | Plunger assembly for elevator buffer and elevator buffer |
-
2020
- 2020-07-28 CN CN202010738269.5A patent/CN113998559B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014012588A (en) * | 2012-07-04 | 2014-01-23 | Mitsubishi Electric Corp | Elevator shock absorber and return method for the same |
| CN202687688U (en) * | 2012-07-17 | 2013-01-23 | 河北东方富达机械有限公司 | Oil buffer |
| CN203756846U (en) * | 2014-04-02 | 2014-08-06 | 上海青浦电梯配件有限公司 | Plunger-type hydraulic buffer |
| CN108178042A (en) * | 2017-12-01 | 2018-06-19 | 宁波奥德普电梯部件有限公司 | A kind of novel elevator buffer |
| CN207684690U (en) * | 2017-12-25 | 2018-08-03 | 广东华辉电梯配件有限公司 | A kind of Elevator hydraulic buffer |
| CN210884794U (en) * | 2019-07-29 | 2020-06-30 | 杭州沪宁电梯部件股份有限公司 | Hydraulic buffer |
| CN213112104U (en) * | 2020-07-28 | 2021-05-04 | 杭州沪宁电梯部件股份有限公司 | Plunger assembly for elevator buffer and elevator buffer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113998559A (en) | 2022-02-01 |
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