CN213171294U - Lifting machine - Google Patents
Lifting machine Download PDFInfo
- Publication number
- CN213171294U CN213171294U CN202021995573.XU CN202021995573U CN213171294U CN 213171294 U CN213171294 U CN 213171294U CN 202021995573 U CN202021995573 U CN 202021995573U CN 213171294 U CN213171294 U CN 213171294U
- Authority
- CN
- China
- Prior art keywords
- frame
- guide
- sprocket
- wire rope
- guide rail
- 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.)
- Active
Links
Images
Landscapes
- Types And Forms Of Lifts (AREA)
Abstract
The utility model provides a lifting machine belongs to material conveying equipment technical field. The elevator comprises a lifting frame and a driving mechanism. The hoisting frame includes chassis, frame, guide rail and side bearer, motor output end transmission connect in the reduction gear input, the traction member includes first pivot, reel, sprocket and second pivot, the reel all connect in through the wire rope transmission the sprocket, all be provided with the leading wheel on the hopper both sides lateral wall, the equal sliding connection of leading wheel in the guide rail inner wall, the anticreep board has been embraced at the sprocket top, the reel with be provided with between the sprocket and be used for putting the guide holder of wire rope position, the utility model discloses a setting up of guide holder and anticreep board is effectual prevents that wire rope from breaking away from reel and sprocket, guarantees wire rope's position, reduces the probability that wire rope breaks away from the sprocket, and the production process operates steadily, and reinforcing security performance effectively solves current lifting machine and uses unsafe problem.
Description
Technical Field
The utility model relates to a material conveying equipment field particularly, relates to a lifting machine.
Background
The hoister is used for vertically hoisting the limestone, coal, gypsum, clinker, dry clay and other lump granular materials and the powdery materials such as raw materials, cement, coal powder and the like which pass through the crusher. When the elevator is found to work in the using process, no safety protection device exists, the steel wire rope of the elevator is easy to separate from the chain wheel, and once the steel wire rope is separated from the chain wheel, serious accidents can happen, so that great potential safety hazards are generated.
SUMMERY OF THE UTILITY MODEL
In order to compensate above not enough, the utility model provides a lifting machine aims at improving current lifting machine and does not have safety arrangement, and the wire rope of lifting machine breaks away from the sprocket easily, has the problem of very big potential safety hazard.
The utility model discloses a realize like this:
the utility model provides a lifting machine, including hoisting frame and actuating mechanism.
The hoisting frame includes chassis, frame, guide rail and side bearer, the frame with the guide rail all includes two long channel-section steels that slope and symmetry set up, the frame with guide rail parallel arrangement, just the frame with the equal fixed connection in bottom of guide rail in chassis top one end, the guide rail top is connected with one section arc guide rail, side bearer bottom fixed connection in the chassis top other end, side bearer top fixed connection in the guide rail.
The driving mechanism comprises a hopper, a motor, a speed reducer and a traction piece, the hopper slides along the length direction of the frame, the motor and the speed reducer are both arranged at the top of the underframe, the output end of the motor is in transmission connection with the input end of the speed reducer, the traction piece comprises a first rotating shaft, a winding drum, a chain wheel and a second rotating shaft, the output end of the speed reducer is in transmission connection with the first rotating shaft through a transmission piece, both ends of the first rotating shaft are in rotational connection with the bottom end of the frame, the winding drum is fixedly sleeved at both ends of the first rotating shaft, both ends of the second rotating shaft are in rotational connection with the top end of the frame, the chain wheel is fixedly sleeved at both ends of the second rotating shaft, the winding drum is in transmission connection with the chain wheel through a steel wire rope, one end of the steel wire rope, all be provided with the leading wheel on the lateral wall of hopper both sides, the equal sliding connection of leading wheel in guide rail inner wall, the sprocket top has embraced the anticreep board, the reel with be provided with between the sprocket and be used for putting the guide holder of wire rope position.
The utility model discloses an in the embodiment, guide holder equidistance interval sets up a plurality of groups, the equal fixed connection of guide holder in frame inner wall.
In an embodiment of the present invention, the guide seat is provided with a guide groove for the steel wire rope to slide, the guide seat is of a hollow structure, and the guide seat is at least provided with three fixing holes.
The utility model discloses an in one embodiment, the anticreep board includes fixed part and stop part, fixed part fixed connection in the frame inner wall, stop part fixed connection in the fixed part bottom, the stop part cover in the sprocket top just leaves the clearance.
The utility model discloses an in one embodiment, the driving medium includes first gear and second gear, first gear fixed cup joint in the reduction gear output, the second gear is fixed cup joint in first pivot one end tip, first gear with the meshing has the chain between the second gear.
The utility model discloses an in the embodiment, be provided with the connecting axle on the lateral wall of hopper both sides, the leading wheel rotate connect in connecting axle one end, the leading wheel adaptation in guide rail and arc guide rail.
The utility model discloses an in one embodiment, chassis bottom four corners is provided with the walking wheel, the walking wheel is universal locking wheel, walking wheel one side is provided with supports the regulating part, the contact jaw that supports regulating part and ground is equipped with the backup pad.
The utility model discloses an in the embodiment, be provided with control switch on the side bearer, the last scram button that is equipped with of control switch.
In an embodiment of the present invention, a guard rail is disposed on a side of the frame away from the guide rail.
In an embodiment of the present invention, the frame and the guide rail are connected with a plurality of connecting rods therebetween.
The utility model has the advantages that: the utility model discloses a lifting machine that above-mentioned design obtained, during the use, to the built-in material of packing into of hopper, starter motor, the motor drives first pivot and reel through reduction gear and driving medium and rotates, and wire rope draws the hopper through the sprocket and upwards climbs along the guide rail, when the leading wheel rises to arc guide rail, and the hopper continues the rebound, and the leading wheel then shifts up along arc guide rail, and the hopper is slope with slow upset, unloads the material, and after unloading finishes, the hopper descends and returns the normal position, the utility model discloses a setting up of guide holder and anticreep board effectually prevents that wire rope from breaking away from reel and sprocket, guarantees wire rope's position, improves transmission precision, improves sprocket and wire rope degree of cooperation, reduces wire rope and breaks away from the probability of sprocket, and the production process operates steadily, and reinforcing security performance effectively solves current lifting machine.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a hoist according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a lifting frame according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention at a first viewing angle;
fig. 4 is a schematic structural diagram of a driving mechanism at a second viewing angle according to an embodiment of the present invention;
fig. 5 is an enlarged view of a portion a in fig. 4 according to an embodiment of the present invention;
fig. 6 is a schematic view of an anti-separation plate structure provided in an embodiment of the present invention;
fig. 7 is a schematic structural view of a guide seat according to an embodiment of the present invention.
In the figure: 10-a hoisting frame; 110-a chassis; 120-a frame; 130-a guide rail; 140-sideframe; 150-a connecting rod; 160-protective fence; 170-support adjustment; 171-a support plate; 180-traveling wheels; 20-a drive mechanism; 210-a hopper; 211-a traction ring; 220-a motor; 230-a reducer; 240-a transmission; 241-a first gear; 242-a chain; 243-second gear; 250-a traction member; 251-a first rotating shaft; 252-a spool; 253-a sprocket; 254-steel wire rope; 255-a second shaft; 260-a guide wheel; 261-a connecting shaft; 270-a guide seat; 271-a guide groove; 272-a fixation hole; 280-an anti-drop plate; 281-a fixation section; 282-a blocking portion; 290-control switch.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
Referring to fig. 1-7, the present invention provides a technical solution: a hoist includes a hoist frame 10 and a drive mechanism 20.
Referring to fig. 2, the lifting frame 10 includes a bottom frame 110, a frame 120, a guide rail 130 and a side frame 140, wherein the frame 120 and the guide rail 130 include two long channel steels which are obliquely and symmetrically arranged, the frame 120 and the guide rail 130 are arranged in parallel, a plurality of connecting rods 150 are connected between the frame 120 and the guide rail 130 for reinforcing the connection between the frame 120 and the guide rail 130, and the bottom ends of the frame 120 and the guide rail 130 are fixedly connected to one end of the top of the bottom frame 110, specifically, the frame 120 and the guide rail 130 are fixedly connected to the bottom frame 110 by welding, the top end of the guide rail 130 is connected to a section of arc-shaped guide rail for overturning and obliquely discharging the hopper 210, the bottom end of the side frame 140 is fixedly connected to the other end of the top of the bottom frame 110.
In some specific embodiments, four corners of the bottom of the chassis 110 are provided with walking wheels 180, the walking wheels 180 are universal locking wheels so as to move the lifting frame 10 to a place where the lifting frame needs to be used, one side of the walking wheels 180 is provided with a supporting and adjusting member 170, a supporting plate 171 is arranged at a contact end of the supporting and adjusting member 170 and the ground, the supporting and adjusting member 170 can be upwards rotated to expose the walking wheels 180 when the lifting frame 10 needs to be moved, and the lifting frame 10 is moved through the walking wheels 180; when the lifting frame is placed, the supporting and adjusting members 170 can be rotated downwards to support the casters 180 through the supporting plates 171 so as to support the lifting frame 10 or fix the lifting frame 10 at a designated place, the side of the frame 120 away from the guide rails 130 is provided with the guard rails 160, and the guard rails 160 play a role in protecting the material in the hopper 210 from falling or the hopper 210 is rapidly lowered to hurt a worker due to a failure.
Referring to fig. 3-7, the driving mechanism 20 includes a hopper 210, a motor 220, a reducer 230, and a traction member 250, the hopper 210 slides along the length direction of the rack 120, the motor 220 and the reducer 230 are both mounted on the top of the base frame 110, the motor 220 and the reducer 230 are both fixed to the base frame 110 by bolts or screws, the output end of the motor 220 is connected to the input end of the reducer 230 in a transmission manner, the motor 220 is connected to the input end of the reducer 230 in a transmission manner by a belt, the traction member 250 includes a first rotating shaft 251, a winding drum 252, a sprocket 253, and a second rotating shaft 255, the output end of the reducer 230 is connected to, when specifically arranged, the transmission member 240 includes a first gear 241 and a second gear 243, the first gear 241 is fixedly sleeved on the output end of the speed reducer 230, the second gear 243 is fixedly sleeved on one end of the first rotating shaft 251, and a chain 242 is engaged between the first gear 241 and the second gear 243.
It should be noted that both ends of first pivot 251 are all rotated and are connected in frame 120 bottom, fixed cup joint in first pivot 251 both ends of reel 252, the both ends tip of second pivot 255 is all rotated and is connected in frame 120 top, it is specific, the both ends of first pivot 251 and second pivot 255 are all rotated through the bearing and are connected in frame 120, improve the rotation efficiency of reel 252 and sprocket 253, can guarantee the promotion precision of lifting machine like this, sprocket 253 is fixed to cup joint at second pivot 255 both ends, reel 252 is all connected in sprocket 253 through wire rope 254 transmission, wire rope 254 one end is fixed to be twined in reel 252, the wire rope 254 other end passes through towing ring 211 fixed connection in hopper 210 both sides outer wall.
When specifically setting up, all be provided with leading wheel 260 on the lateral wall of hopper 210 both sides, the equal sliding connection of leading wheel 260 is in guide rail 130 inner wall, leading wheel 260 plays the guide limiting displacement, be provided with connecting axle 261 on the lateral wall of hopper 210 both sides, leading wheel 260 rotates and connects in connecting axle 261 one end, leading wheel 260 adaptation in guide rail 130 and arc guide rail, leading wheel 260 slides along guide rail 130 and arc guide rail, be provided with control switch 290 on the side bearer 140, be equipped with the emergency stop button on the control switch 290, be used for emergency shutdown motor 220 when the accident, make hopper 210 stop the speed and fall, avoid causing bigger harm.
In this embodiment, the anti-slip plate 280 surrounds the top of the sprocket 253, the anti-slip plate 280 is to prevent the wire rope 254 from separating from the drum 252 and the sprocket 253, and further improves the matching degree between the sprocket 253 and the wire rope 254, thereby improving the working efficiency virtually, the anti-slip plate 280 includes a fixing portion 281 and a blocking portion 282, the fixing portion 281 is fixedly connected to the inner wall of the frame 120, the blocking portion 282 is fixedly connected to the bottom of the fixing portion 281, through holes for passing bolts are formed in the fixing portion 281 and the blocking portion 282, the fixing portion 281 and the blocking portion 282 are fixedly connected to the frame 120 by passing bolts or screws through the through holes, the blocking portion 282 covers the top of the sprocket 253 and leaves a gap, a guide seat 270 for aligning the position of the wire rope 254 is disposed between the drum 252 and the sprocket 253, the guide seats 270 are used for ensuring the position of the wire rope 254, equal fixed connection of guide holder 270 in frame 120 inner wall, set up on the guide holder 270 and supply the gliding guide way 271 of wire rope 254, the guide way 271 can play the effect of supplementary wire rope 254 pendulum positive position, can reduce the probability that wire rope 254 breaks away from sprocket 253 like this, guide holder 270 is hollow structure, can reduce manufacturing cost like this, reduce the weight of lifting machine, make things convenient for the installation of staff subtend seat 270, be equipped with three fixed orifices 272 on the guide holder 270 and can guarantee the stability of being connected between guide holder 270 and the frame 120 like this at least.
Specifically, the working principle of the elevator is as follows:
when in use, the lifting frame 10 is moved to a place needing to be used by the travelling wheels 180, materials are filled into the hopper 210, the motor 220 is started, the motor 220 drives the first rotating shaft 251 and the winding drum 252 to rotate through the speed reducer 230 and the transmission piece 240, the steel wire rope 254 pulls the hopper 210 to climb upwards along the guide rail 130 through the chain wheel 253, when the guide wheel 260 rises to the arc-shaped guide rail, the hopper 210 continues to move upwards, the guide wheel 260 moves upwards along the arc-shaped guide rail, the hopper 210 slowly turns and inclines, the materials are discharged, after the unloading is finished, the hopper 210 descends to return to the original position, the steel wire rope 254 is effectively prevented from being separated from the winding drum 252 and the chain wheel 253 through the arrangement of the guide seat 270 and the anti-falling plate 280, the position of the steel wire rope 254 is ensured, the transmission precision is improved, the matching degree of the chain wheel 253 and the steel wire rope 254 is improved, the probability that the steel wire rope 254 is separated from the chain wheel 253 is reduced, the production process is stable in operation, the safety performance is enhanced, and the problem that the existing elevator is.
It should be noted that the specific model specification of the motor 220 needs to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The power supply of the motor 220 and its principle will be clear to a person skilled in the art and will not be described in detail here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hoisting machine is characterized by comprising
The lifting frame (10), the lifting frame (10) comprises a base frame (110), a rack (120), guide rails (130) and side frames (140), the rack (120) and the guide rails (130) comprise two long channel steel which are obliquely and symmetrically arranged, the rack (120) and the guide rails (130) are arranged in parallel, the bottom ends of the rack (120) and the guide rails (130) are fixedly connected to one end of the top of the base frame (110), the top end of the guide rails (130) is connected with a section of arc-shaped guide rail, the bottom end of each side frame (140) is fixedly connected to the other end of the top of the base frame (110), and the top end of each side frame (140) is fixedly connected to the corresponding guide rail (130);
the driving mechanism (20), the driving mechanism (20) includes a hopper (210), a motor (220), a speed reducer (230) and a traction member (250), the hopper (210) slides along the length direction of the rack (120), the motor (220) and the speed reducer (230) are both installed at the top of the chassis (110), the output end of the motor (220) is connected to the input end of the speed reducer (230) in a transmission manner, the traction member (250) includes a first rotating shaft (251), a winding drum (252), a chain wheel (253) and a second rotating shaft (255), the output end of the speed reducer (230) is connected to the first rotating shaft (251) in a transmission manner through a transmission member (240), both ends of the first rotating shaft (251) are rotatably connected to the bottom end of the rack (120), the winding drum (252) is fixedly sleeved at both ends of the first rotating shaft (251), both ends of the second rotating shaft (255) are rotatably connected to the top end of the rack (120, sprocket (253) is fixed cup joint second pivot (255) both ends, reel (252) all through wire rope (254) transmission connect in sprocket (253), wire rope (254) one end fixed twine in reel (252), wire rope (254) other end through traction ring (211) fixed connection in hopper (210) both sides outer wall, all be provided with leading wheel (260) on hopper (210) both sides lateral wall, leading wheel (260) all sliding connection in guide rail (130) inner wall, sprocket (253) top is surroundd anti-disengaging plate (280), reel (252) with be provided with between sprocket (253) and be used for putting the guide holder (270) of wire rope (254) position.
2. The hoisting machine as claimed in claim 1, characterized in that the guide seats (270) are arranged in groups at equal intervals, and the guide seats (270) are fixedly connected to the inner wall of the frame (120).
3. The hoisting machine as claimed in claim 2, wherein the guide seat (270) is provided with a guide groove (271) for the steel cable (254) to slide, the guide seat (270) is of a hollow structure, and the guide seat (270) is provided with at least three fixing holes (272).
4. The hoisting machine as claimed in claim 1, wherein the anti-drop plate (280) comprises a fixing portion (281) and a blocking portion (282), the fixing portion (281) is fixedly connected to the inner wall of the frame (120), the blocking portion (282) is fixedly connected to the bottom of the fixing portion (281), and the blocking portion (282) covers the top of the chain wheel (253) with a gap.
5. The hoisting machine as claimed in claim 1, characterized in that the transmission member (240) comprises a first gear (241) and a second gear (243), the first gear (241) is fixedly sleeved on the output end of the speed reducer (230), the second gear (243) is fixedly sleeved on one end of the first rotating shaft (251), and a chain (242) is engaged between the first gear (241) and the second gear (243).
6. The hoisting machine as claimed in claim 1, characterized in that the hopper (210) is provided with a connecting shaft (261) on both side walls, the guide wheel (260) is rotatably connected to one end of the connecting shaft (261), and the guide wheel (260) is adapted to the guide rail (130) and the arc-shaped guide rail.
7. The hoisting machine as recited in claim 1, wherein four corners of the bottom of the base frame (110) are provided with traveling wheels (180), the traveling wheels (180) are universal locking wheels, one side of the traveling wheels (180) is provided with a supporting and adjusting member (170), and a supporting plate (171) is arranged at the contact end of the supporting and adjusting member (170) and the ground.
8. The hoisting machine as claimed in claim 1, characterized in that the side frame (140) is provided with a control switch (290), and the control switch (290) is provided with an emergency stop button.
9. A hoisting machine as claimed in claim 1, characterized in that a protective guard (160) is arranged on the side of the frame (120) remote from the guide rail (130).
10. A hoisting machine as claimed in claim 1, characterized in that several connecting bars (150) are connected between the frame (120) and the guide rail (130).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202021995573.XU CN213171294U (en) | 2020-09-13 | 2020-09-13 | Lifting machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202021995573.XU CN213171294U (en) | 2020-09-13 | 2020-09-13 | Lifting machine |
Publications (1)
Publication Number | Publication Date |
---|---|
CN213171294U true CN213171294U (en) | 2021-05-11 |
Family
ID=75773109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202021995573.XU Active CN213171294U (en) | 2020-09-13 | 2020-09-13 | Lifting machine |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN213171294U (en) |
-
2020
- 2020-09-13 CN CN202021995573.XU patent/CN213171294U/en active Active
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102950653A (en) | Concrete mixing device | |
CN215756065U (en) | Quick hoist device of construction is contained to prefabricated box of bridge | |
CN213623049U (en) | Mining kiln material lifting system | |
CN111994820A (en) | New energy automobile overhauls platform | |
CN213171294U (en) | Lifting machine | |
CN113682935A (en) | Connection structure between elevator and floor during construction elevator parking | |
CN215666515U (en) | Linking structure between elevator and floor when building construction elevator parks | |
CN215326586U (en) | Anti-falling timber handling device for civil construction | |
CN112661077B (en) | High worker civil engineering of security uses engineering material hoisting device | |
CN218968578U (en) | Building material lifting machine | |
US1745046A (en) | Portable stack lifter | |
CN217756395U (en) | Elevator with a movable elevator car | |
CN212668216U (en) | High altitude construction car for construction convenient to transportation building rubbish | |
CN213111151U (en) | Safe feeding and mixing material machine | |
CN216235784U (en) | Building construction material lifting machine | |
CN216377252U (en) | Pull rod crane for building construction | |
CN217806810U (en) | Low-speed elevator capable of preventing backflow | |
CN213505481U (en) | Novel material lifting machine | |
CN214167277U (en) | Hoist conveyer of road bed protection prefabricated section | |
CN215945758U (en) | Bucket elevator | |
CN210910639U (en) | Concrete lifting and discharging device | |
CN219411901U (en) | Discharging platform for building construction | |
CN216971925U (en) | Novel coal mine electromechanical lifting and transporting device | |
CN221521893U (en) | Material lifting and unloading device of track flat car | |
CN220596982U (en) | Lifting device for building |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant |