CN110589669A - Machine placing rack for elevator - Google Patents
Machine placing rack for elevator Download PDFInfo
- Publication number
- CN110589669A CN110589669A CN201910956331.5A CN201910956331A CN110589669A CN 110589669 A CN110589669 A CN 110589669A CN 201910956331 A CN201910956331 A CN 201910956331A CN 110589669 A CN110589669 A CN 110589669A
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- steel
- bracket
- machine
- machine placing
- channel
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 164
- 239000010959 steel Substances 0.000 claims abstract description 164
- 230000003014 reinforcing effect Effects 0.000 claims description 42
- 238000005452 bending Methods 0.000 claims description 22
- 238000005728 strengthening Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims 3
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B19/00—Mining-hoist operation
- B66B19/005—Mining-hoist operation installing or exchanging the elevator drive
Landscapes
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
The invention discloses a machine placing rack for a lift, which comprises a machine placing steel beam, traction machines, guide wheels and a rope hitch plate, wherein the left side and the right side of the machine placing steel beam are respectively provided with a winch, shaft walls on the left side and the right side of a shaft are respectively provided with a pull lug, steel wire ropes on the two winches are respectively connected with the pull lugs on the shaft walls, and the winch drives the machine placing rack to move up and down; put one side of quick-witted girder steel and be equipped with flexible subassembly, flexible subassembly extension supports in each layer door opening place flat bed face of well, the opposite side of putting the quick-witted girder steel is equipped with bracket support piece, bracket support piece lock is in establishing the bracket subassembly on the well wall. The invention has the advantages that the machine placing frame is automatically lifted in the shaft, the equipment is fixed on the machine placing frame, the size of the machine placing frame is reduced by the telescopic component in the machine placing frame, the machine placing frame does not need to be inclined to ascend or descend, and the machine placing frame can ascend or descend in a staged mode.
Description
Technical Field
The invention relates to a lifting device, in particular to a machine placing rack for a lifter.
Background
At present, most of the machine placing frames and the traction machines which use outdoor construction elevators to carry the elevators have low safety coefficient of outdoor transportation. Or a machine placing rack and a traction machine are installed in the well, channel steel is installed in the well, a metal support or a lifting hook is arranged on a machine room top plate or a cross beam, the machine placing rack and the traction machine are pulled through a plurality of slings or hoists respectively, the machine placing rack needs to be inclined when being lifted upwards so as not to collide with the wall of the well, and meanwhile, the machine placing rack needs to be pulled upwards from the bottom of the well to the top layer all the time and cannot be lifted in a staged mode.
Disclosure of Invention
The invention provides a machine placing rack for a lifter, which aims to solve the problems of inconvenience and insecurity in hoisting of a machine placing rack and a traction machine in the prior art.
The technical scheme adopted by the invention is as follows:
a machine placing frame for a lifter comprises a machine placing steel beam, traction machines, guide wheels and a rope hitch plate, wherein the left side and the right side of the machine placing steel beam are respectively provided with a winch, shaft walls on the left side and the right side of a shaft are respectively provided with a pull lug, steel wire ropes on the two winches are respectively connected with the pull lugs on the shaft walls, and the winches drive the machine placing frame to move up and down;
put one side of quick-witted girder steel and be equipped with flexible subassembly, flexible subassembly extension supports in each layer door opening place flat bed face of well, the opposite side of putting the quick-witted girder steel is equipped with bracket support piece, bracket support piece lock is in establishing the bracket subassembly on the well wall.
Further, bracket support piece bends, the last bolt hole that is equipped with of bracket support piece, the bracket subassembly includes bracket locating plate and bracket connecting plate, the bracket locating plate bends, the position that bracket locating plate and bracket support piece's bolt hole correspond also is equipped with the bolt hole, both sides are bent around the bracket connecting plate, and the portion of bending of bracket connecting plate is connected with the portion of bending of bracket locating plate, be equipped with a plurality of bolt hole on the bracket connecting plate. When the bracket supporting piece is fixed with the bracket assembly, the bracket positioning plate is connected with the bracket supporting piece through bolts, and the bracket connecting plate is connected with the well wall through bolts.
Further, the bracket subassembly still includes three bracket strengthening rib, and equidistant the installing on the bracket connecting plate of three bracket strengthening rib, be equipped with the bayonet socket on the bracket strengthening rib, be equipped with the bending mouth corresponding with the bayonet socket of bracket strengthening rib on the bracket support piece. When the clamping opening is formed in the bracket reinforcing rib and is favorable for placing the machine frame, the bending opening of the bracket supporting piece is buckled on the clamping opening of the bracket reinforcing rib. The bracket reinforcing ribs facilitate increased strength and rigid connection between the hoistway wall when the bracket assembly is connected to the bracket support.
Further, the inner sides of the bracket reinforcing ribs and the bent parts of the bracket connecting plates are designed in oblique angles. The oblique angle design of bracket connecting plate and bracket strengthening rib is favorable to this put quick-witted frame and can not collide the bracket subassembly of installing on the well wall when rising.
Further, flexible subassembly includes preceding flexible channel-section steel and the flexible channel-section steel in back, the preceding flexible channel-section steel inserts with the flexible channel-section steel in back and puts inside the quick-witted girder steel, preceding flexible channel-section steel all is equipped with a plurality of bolt hole with flexible channel-section steel upper portion in back, be equipped with the Z word roof beam of bending and the enhancement of bending between preceding flexible channel-section steel and the flexible channel-section steel in back and draw the ear, it is equipped with the push rod mounting panel on the quick-witted girder steel to put, be equipped with the push rod on the push rod mounting panel, strengthen the portion of bending of drawing. The Z word roof beam increases the intensity and the rigidity of flexible channel-section steel, and the push rod provides the power supply and makes flexible subassembly to the activity of well wall, and flexible subassembly forms the movable part in putting the quick-witted girder steel, and flexible subassembly is putting the quick-witted frame and rises or the decline in-process withdrawal and put quick-witted girder steel inside, reduces the whole diameter of putting the quick-witted frame and prevents to put quick-witted frame and well wall collision, and flexible subassembly is stretched under the effect of push rod and is supported in the door opening at place behind the arrival floor.
Further, the contact part of the front side and the rear side of the machine steel beam and the telescopic assembly is provided with a plurality of C-shaped steel reinforcing plates. A hollow area is formed between the C-shaped steel reinforcing plate and the front side channel steel and the rear side channel steel, and the C-shaped steel reinforcing plate has the function of preventing the telescopic assembly from derailing. The C-shaped steel reinforcing plate has the function of increasing the strength.
Further, put quick-witted girder steel and include front side channel-section steel, rear side channel-section steel and be located the middle H steel between front side channel-section steel and the rear side channel-section steel, all be equipped with a plurality of bolt hole on front side channel-section steel and the rear side channel-section steel, the left and right sides of putting quick-witted girder steel is equipped with left shrouding and right shrouding respectively, front side channel-section steel and rear side channel-section steel are connected to left and right shrouding, respectively be equipped with two reinforcing plates about the left side shrouding inboard, front side channel-section steel and middle H steel are connected to two reinforcing plates about the front side, H steel and rear side channel-section steel in the middle of two reinforcing. When the telescopic channel steel is supported on the plane floor where each layer of door opening of the shaft is located in an extending mode, the machine placing steel beam and the telescopic assembly are fixed through bolts. The reinforcing plate increases the strength of the telescopic channel steel.
Furthermore, the left winch is fixedly installed on the reinforcing plate on the upper side between the rear side channel steel and the middle H steel, the right winch is installed between the middle H steel and the front side channel steel, and the left and right winches are arranged diagonally. The diagonal design of the winch is beneficial to the upward balanced movement of the whole machine placing frame.
Furthermore, the pull lug is bent to form a bending part, the pull lug is connected with the well wall through a bolt, and a connecting hole is formed in the bending part of the pull lug. The pull lug is connected with a steel wire rope of the winch.
Furthermore, a guardrail is arranged on the front side channel steel and the rear side channel steel respectively, and the guardrail is connected with the C-shaped steel reinforcing plate on the front side channel steel and the rear side channel steel through a guardrail seat. The equipment of the machine frame is protected by the guardrail and cannot fall, and the safety is ensured.
The invention has the following beneficial effects: the machine placing frame is automatically lifted in the shaft, equipment is fixed on the machine placing frame, the size of the machine placing frame is reduced by stretching of the telescopic assembly in the machine placing frame, the machine placing frame does not need to incline to ascend or descend, and the machine placing frame can ascend or descend in a staged mode.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a front view of the apparatus of the present invention;
FIG. 3 is a schematic view of a machine shelving steel beam configuration;
FIG. 4 is a schematic view of the telescoping assembly in an active configuration;
FIG. 5 is a schematic view of a corbel assembly;
FIG. 6 is a schematic view of the bracket assembly with the bracket positioning plate removed;
FIG. 7 is a schematic view of a corbel support structure;
fig. 8 is a schematic diagram of the structure of the bracket positioning plate.
In the figure, 1 is a pull lug, 2 is a traction machine, 3 is a guide wheel, 400 is a steel beam of a machine placing, 410 is a left sealing plate, 420 is a reinforcing plate, 430 is middle H steel, 440 is a C-shaped steel reinforcing plate, 450 is front side channel steel, 460 is rear side channel steel, 470 is a bracket supporting piece, 480 is a right sealing plate, 500 is a telescopic component, 510 is a Z-shaped beam, 520 is a reinforcing pull lug, 530 is front telescopic channel steel, 540 is rear telescopic channel steel, 6 is a rope head plate, 700 is a guardrail, 710 is a guardrail seat, 800 is a bracket component, 810 is a bracket positioning plate 820, is a bracket reinforcing rib, 830 is a bracket connecting plate, 10 is a push rod mounting plate, 11 is a winch and 12 is a push rod.
Detailed Description
The invention is explained in detail below with reference to the figures and examples.
Example (b): as shown in fig. 1 to 8, a machine placing frame for an elevator comprises a machine placing steel beam 400, a traction machine 2, a guide wheel 3 and a rope hitch plate 6, wherein the left side and the right side of the machine placing steel beam 400 are respectively provided with a winch 11, shaft walls on the left side and the right side of a shaft are respectively provided with a pull lug 1, steel wire ropes on the two winch 11 are respectively connected with the pull lugs 1 on the shaft walls, and the winch 11 drives the machine placing frame to move up and down;
put one side of quick-witted girder steel 400 and be equipped with flexible subassembly 500, flexible subassembly 500 extension is supported in the flat bed face at each layer door opening place of well, the opposite side of putting quick-witted girder steel 400 is equipped with bracket support spare 470, bracket support spare 470 lock is in the bracket subassembly 800 of establishing on the well wall.
The bracket 470 is bent, be equipped with the bolt hole on the bracket 470, bracket subassembly 800 includes bracket locating plate 810 and bracket connecting plate 830, bracket locating plate 810 is bent, the position that bracket locating plate 810 and bracket support 470's bolt hole correspond also is equipped with the bolt hole, both sides are bent around the bracket connecting plate 830, and the portion of bending of bracket connecting plate 830 is connected with the portion of bending of bracket locating plate 810, be equipped with a plurality of bolt hole on the bracket connecting plate 830. When the bracket support 470 is fixed to the bracket assembly 800, the bracket positioning plate 810 is bolted to the bracket support 470, and the bracket connecting plate 830 is bolted to the hoistway wall.
The bracket subassembly still includes three bracket strengthening rib 820, and three bracket strengthening rib 820 equidistant installs on bracket connecting plate 830, be equipped with the bayonet socket on the bracket strengthening rib 820, be equipped with the bending mouth corresponding with the bayonet socket of bracket strengthening rib 820 on the bracket support 470. When the clamping opening is formed in the bracket reinforcing rib 820 and is favorable for placing a machine frame, the bending opening of the bracket supporting piece 470 is buckled on the clamping opening of the bracket reinforcing rib 820. The corbel ribs 820 facilitate an increased strength and rigid connection between the hoistway walls when the corbel assembly 800 is coupled to the corbel support 470.
The inner side of the bracket reinforcing rib 820 and the bent part of the bracket connecting plate 830 are designed in an oblique angle mode. The angled design of the corbel attachment plate 830 and corbel ribs 820 facilitates that the machine frame does not collide with a corbel assembly 800 mounted to the hoistway wall when raised.
Telescopic component 500 includes preceding flexible channel-section steel 530 and the flexible channel-section steel 540 in back, preceding flexible channel-section steel 530 inserts with the flexible channel-section steel 540 in back and puts inside quick-witted girder steel 400, preceding flexible channel-section steel 530 all is equipped with a plurality of bolt hole with flexible channel-section steel 540 upper portion in back, be equipped with the Z word roof beam 510 of bending and the enhancement of bending between preceding flexible channel-section steel 530 and the flexible channel-section steel 540 in back and draw ear 520, it is equipped with push rod mounting panel 10 on the quick-witted girder steel 400 to put, push rod 12 is equipped with on the push rod mounting panel 10, the portion of bending of ear 520 is drawn in the enhancement on. Z-shaped roof beam 510 increases the intensity and the rigidity of flexible channel-section steel, push rod 12 provides the power supply and makes flexible subassembly 500 move about to the well wall, flexible subassembly 500 forms the movable part in putting quick-witted girder steel 400, flexible subassembly 500 is putting quick-witted frame and is ascending or the decline in-process withdrawal put quick-witted girder steel 400 inside, it prevents to put quick-witted frame and well wall collision to reduce the whole diameter of putting quick-witted frame, reach flexible subassembly 500 and stretch under the effect of push rod 12 and support in the door opening at place behind the floor.
The contact parts of the front side and the rear side of the machine placing steel beam 400 and the telescopic assembly 500 are provided with a plurality of C-shaped steel reinforcing plates 440. A hollow region is formed between the C-shaped steel reinforcement plate 440 and the front and rear channel steels 450 and 460 and the C-shaped steel reinforcement plate 440 has a function of preventing the derailment of the telescopic assembly 500. The C-shaped steel reinforcing plate 440 has an effect of increasing strength.
Put quick-witted girder steel 400 and include front side channel-section steel 450, rear side channel-section steel 460 and be located middle H steel 430 between front side channel-section steel 450 and the rear side channel-section steel 460, all be equipped with a plurality of bolt hole on front side channel-section steel 450 and the rear side channel-section steel 460, the left and right sides of putting quick-witted girder steel 400 is equipped with left shrouding 410 and right shrouding 480 respectively, front side channel-section steel 450 and rear side channel-section steel 460 are connected to left and right shrouding, left side shrouding 410 is inboard respectively to be equipped with two reinforcing plates 420 from top to bottom, and front side channel-section steel 450 and middle H steel 430 are connected to two reinforcing plates 420 about the front side, and H steel 430 and rear side channel-section steel 460. When the telescopic channel steel is supported on the plane of each layer of door opening of the shaft in an extending way, the machine placing steel beam 400 and the telescopic assembly 500 are fixed through bolts. The reinforcing plate increases the strength of the telescopic channel steel.
The left winch 11 is fixedly installed on the reinforcing plate 420 at the upper side between the rear-side channel steel 460 and the middle H steel 430, the right winch 11 is installed between the middle H steel 430 and the front-side channel steel 450, and the left and right winches 11 are arranged diagonally. The diagonal design of the hoist 11 facilitates the balanced movement of the whole machine frame upwards.
The pull lug 1 is bent to form a bending part, the pull lug 1 is connected with the well wall through a bolt, and a connecting hole is formed in the bending part of the pull lug 1. The pull lug 1 is connected with a steel wire rope of a windlass 11.
The front channel steel 450 and the rear channel steel 460 are respectively provided with a guardrail 700, and the guardrail 700 is connected with the front channel steel 450 and the C-shaped steel reinforcing plate 440 on the rear channel steel 460 through a guardrail seat 710. The guardrail 700 protects the equipment for placing the machine frame from falling, and the safety is ensured.
The traction machine and other equipment are installed and fixed on the machine placing frame, the machine placing frame is placed in the middle of the shaft, a plurality of pull lugs 1 are installed on two sides of the shaft at intervals, a plurality of bracket assemblies 800 are installed on one side close to bracket supporting pieces 470 of the machine placing frame at intervals, a steel wire rope on a winch 11 is hooked on the pull lugs 1 at the lower ends of two sides of the shaft, the machine placing frame is horizontally lifted to a specified floor under the work of the winch 11, due to the different heights of the two pull lugs 1 and the inclined surface design of the bracket assemblies 800, the right side of the machine placing frame cannot collide with the bracket assemblies 800 when the machine placing frame is inclined and lifted, at the moment, the machine placing frame is fixed on the specified floor, the bracket supporting pieces 470 are buckled on bayonets of bracket reinforcing ribs 820 arranged on the wall of the shaft, the push rod 12 is opened, the push rod 12 acts to push reinforcing pull lugs 520 connected with the push rod 12 to move towards the wall of the shaft, and after the, the telescopic assembly 500 is supported on the plane of each layer of hoistway door opening, at the moment, a worker fixes the front side channel steel 450 and the front telescopic channel steel 530, the rear side channel steel 460 and the rear telescopic channel steel 540 respectively by bolts, and the machine frame is placed and fixed on a specified floor. When the machine placing frame needs to continuously ascend or descend, the bolts on the telescopic assemblies 500 are loosened, the push rods 12 act, the telescopic assemblies 500 retract to the right into the machine placing steel beams 400, the right side of the machine placing frame is lifted upwards, and the machine placing frame can continuously ascend or descend. When the machine frame needs to ascend or descend higher or lower floors, the pull lug 1 and the bracket assembly 800 on the hoistway can be detached and repeatedly installed on the wall of the hoistway. If the floor on which the elevator is installed is lower, the machine placing frame does not need to ascend or descend in a staged mode, and the machine placing frame directly ascends to the topmost floor or directly descends to a hoistway pit.
Claims (10)
1. A machine placing rack for a lift comprises a machine placing steel beam (400) and is characterized in that a winch (11) is arranged on each of the left side and the right side of the machine placing steel beam (400), pull lugs (1) are arranged on shaft walls on the left side and the right side of a shaft respectively, steel wire ropes on the two winches (11) are connected with the pull lugs (1) on the shaft walls respectively, and the winch (11) drives the machine placing rack to move up and down; put one side of quick-witted girder steel (400) and be equipped with flexible subassembly (500), flexible subassembly (500) extension is supported in each layer door opening place flat bed face of well, the opposite side of putting quick-witted girder steel (400) is equipped with bracket support piece (470), bracket support piece (470) lock is in bracket subassembly (800) of establishing on the well wall.
2. The machine placing rack for the elevator as claimed in claim 1, wherein the bracket supporting piece (470) is bent, bolt holes are formed in the bracket supporting piece (470), the bracket assembly (800) comprises a bracket positioning plate (810) and a bracket connecting plate (830), the bracket positioning plate (810) is bent, bolt holes are also formed in positions, corresponding to the bolt holes of the bracket supporting piece (470), of the bracket positioning plate (810), the front side and the rear side of the bracket connecting plate (830) are bent, the bent portion of the bracket connecting plate (830) is connected with the bent portion of the bracket positioning plate (810), and a plurality of bolt holes are formed in the bracket connecting plate (830).
3. A machine-resting frame for an elevator according to claim 2, characterized in that the bracket assembly further comprises three bracket reinforcing ribs (820), the three bracket reinforcing ribs (820) are mounted on the bracket connecting plate (830) at equal intervals, the bracket reinforcing ribs (820) are provided with bayonets, and the bracket support (470) is provided with bending ports corresponding to the bayonets of the bracket reinforcing ribs (820).
4. A machine rest frame for an elevator according to claim 3, characterised in that the inner sides of the corbel reinforcing bars (820) and the bent parts of the corbel connecting plate (830) are bevelled.
5. The machine frame of putting for lift of claim 1, characterized in that, flexible subassembly (500) includes preceding flexible channel-section steel (530) and back flexible channel-section steel (540), inside preceding flexible channel-section steel (530) and back flexible channel-section steel (540) inserted and put quick-witted girder steel (400), preceding flexible channel-section steel (530) and back flexible channel-section steel (540) upper portion all are equipped with a plurality of bolt hole, be equipped with Z word roof beam (510) of bending and the enhancement of bending and draw ear (520) between preceding flexible channel-section steel (530) and back flexible channel-section steel (540), it is equipped with push rod mounting panel (10) on quick-witted girder steel (400) to put, push rod (12) are equipped with on push rod mounting panel (10), push rod (12) are connected with the portion of bending of strengthening and drawing ear (520) on flexible subassembly (500).
6. A machine resting frame for an elevator according to claim 5, characterised in that the machine resting steel beam (400) is provided with a number of C-shaped steel reinforcement plates (440) at the points where the front and rear sides are in contact with the telescopic assembly (500).
7. A machine resting frame for an elevator according to claim 5, the machine-resting steel beam (400) comprises a front side channel steel (450), a rear side channel steel (460) and a middle H steel (430) positioned between the front side channel steel (450) and the rear side channel steel (460), the front side channel steel (450) and the rear side channel steel (460) are both provided with a plurality of bolt holes, the left side and the right side of the steel beam (400) of the machine placing machine are respectively provided with a left sealing plate (410) and a right sealing plate (480), the left and right sealing plates are connected with the front side channel steel (450) and the rear side channel steel (460), two reinforcing plates (420) are respectively arranged on the upper side and the lower side of the inner side of the left sealing plate (410), the front side channel steel (450) and the middle H steel (430) are connected with the upper reinforcing plate and the lower reinforcing plate (420) on the front side, and the middle H steel (430) and the rear side channel steel (460) are connected with the upper reinforcing plate and the lower reinforcing plate (420) on the rear side.
8. The rack of claim 7, wherein the left hoist (11) is fixedly installed on the upper reinforcing plate (420) between the rear channel (460) and the middle H-shaped steel (430), the right hoist (11) is installed between the middle H-shaped steel (430) and the front channel (450), and the left and right hoists (11) are diagonally disposed.
9. A machine placing frame for an elevator according to claim 1, characterized in that the pulling lug (1) is bent to form a bent portion, the pulling lug (1) is connected with the wall of the well by a bolt, and the bent portion of the pulling lug (1) is provided with a connecting hole.
10. The machine placing frame for the elevator as claimed in claim 1, wherein a guardrail (700) is respectively arranged on the front side channel steel (450) and the rear side channel steel (460), and the guardrail (700) is connected with the C-shaped steel reinforcing plate (440) on the front side channel steel (450) and the rear side channel steel (460) through a guardrail seat (710).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956331.5A CN110589669A (en) | 2019-10-10 | 2019-10-10 | Machine placing rack for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956331.5A CN110589669A (en) | 2019-10-10 | 2019-10-10 | Machine placing rack for elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110589669A true CN110589669A (en) | 2019-12-20 |
Family
ID=68865999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910956331.5A Pending CN110589669A (en) | 2019-10-10 | 2019-10-10 | Machine placing rack for elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110589669A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517202A (en) * | 2020-05-06 | 2020-08-11 | 奥帝亚电梯有限公司 | Novel adjustable construction elevator |
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