CN115028116A

CN115028116A - Lifting platform with extensible lifting area

Info

Publication number: CN115028116A
Application number: CN202210766802.8A
Authority: CN
Inventors: 曹诗远; 毛志文; 敖仁爱; 张颖红; 舒畅; 张金文; 陈斌; 陈虎; 蒋恺; 孙磊
Original assignee: Jiangxi Construction Engineering Third Construction LLC
Current assignee: Jiangxi Construction Engineering Third Construction LLC
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-09-09
Anticipated expiration: 2042-07-01
Also published as: CN115028116B

Abstract

The invention relates to the technical field of lifting platforms, and discloses a lifting platform with an extensible lifting area, which solves the problems of limitation and insufficiency of the use of the existing lifting platform and comprises a lifting platform connecting seat, wherein a U-shaped fixed seat is fixedly arranged at the top of the lifting platform connecting seat, a main bearing plate is arranged at the top of the U-shaped fixed seat, two reset connecting pieces are respectively connected between two sides of the main bearing plate and two sides of the lifting platform connecting seat, extension bearing plates are respectively arranged at two ends of the main bearing plate, a pair of L-shaped sliding plates are symmetrically and fixedly arranged at the bottoms of the extension bearing plates, the L-shaped sliding plates are respectively arranged in the U-shaped fixed seat, and a supporting component is arranged between the bottoms of the pair of L-shaped sliding plates; this lift platform has the function of extension, can adjust and load according to the demand of using and transport more goods, can improve the scope of staff's operation after the lift platform extension simultaneously, makes the position loading and unloading operation that the staff can close on at lift platform.

Description

Lifting platform with extensible lifting area

Technical Field

The invention belongs to the technical field of lifting platforms, and particularly relates to a lifting platform with an extensible lifting area.

Background

The lifting platform is multifunctional hoisting, loading and unloading mechanical equipment, can vertically convey people or objects, and is widely applied to high-altitude operation and maintenance of factories, automatic warehouses, parking lots, wharfs, buildings, decoration, logistics, electric power, traffic, petroleum, hotels and the like; the lifting platform can be divided into a fixed type, a movable type, a guide rail type and a crank arm type.

At present we common lift platform's workstation area is fixed, makes the workstation can not adjust and load and transport more goods according to the demand that uses, and the fixed area of workstation makes staff's operating range receive the restriction simultaneously, can not be to the position loading and unloading operation that lift platform closes on, and need drop to the workstation and remove, consequently, there is the limitation and not enough in current lift platform's use, to present situation, need design a lift platform that the area of lifting can extend now.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the lifting platform with the extensible lifting area, and the problems of limitation and deficiency in the use of the conventional lifting platform are effectively solved.

In order to achieve the purpose, the invention provides the following technical scheme: a lifting platform with an extensible lifting area comprises a lifting platform connecting seat, wherein a U-shaped fixed seat is fixedly installed at the top of the lifting platform connecting seat, a main bearing plate is arranged at the top of the U-shaped fixed seat, two reset connecting pieces are respectively connected between two sides of the main bearing plate and two sides of the lifting platform connecting seat, two ends of the main bearing plate are respectively provided with an extended bearing plate, a pair of L-shaped sliding plates are symmetrically and fixedly installed at the bottoms of the extended bearing plates, the L-shaped sliding plates are respectively installed inside the U-shaped fixed seat, a supporting component is installed between the bottoms of the pair of L-shaped sliding plates, one side of the supporting component is installed at the end part of the lifting platform connecting seat, a transmission component is installed inside the lifting platform connecting seat, two ends of the transmission component are respectively in transmission connection with the two supporting components, a double-shaft motor is installed at the bottom of the U-shaped fixed seat, and a disc is installed on the inner side of the U-shaped fixed seat, one output end of the double-output-shaft motor penetrates through the U-shaped fixing seat and is fixedly connected with the bottom of the disc, the other output end of the double-output-shaft motor is in transmission connection with the transmission assembly, a round block is mounted at the bottom of the main bearing plate and is mounted at the top of the disc, two connecting curved rods are rotatably mounted on the circumferential surface of the disc, and one ends of the two connecting curved rods are respectively in rotary connection with the bottoms of the two extension bearing plates; the supporting component comprises a fixed plate and two supporting plate strips, the fixed plate is fixedly arranged at the bottom of a pair of L-shaped sliding plates, the two supporting plate strips are rotatably connected at the two ends of the fixed plate, sleeve boxes are mounted on the surfaces of the two supporting plate strips, a first bearing is mounted on one side of each sleeve box, a connecting pin is fixedly arranged in the middle of the first bearing, one end of the connecting pin is fixedly connected with the lifting platform connecting seat, and therefore the connecting pin can be effectively connected.

Preferably, the slotted openings are formed in one side of each supporting lath, the fixed racks are installed inside the slotted openings, and the supporting laths are movably inserted into the sleeve boxes.

Preferably, two relatively the bearing two is all installed to the opposite side of cover box, and fixed mounting has dwang one between the middle part of two bearings two, and the both ends of dwang one all extend to the inside of two cover boxes and install gear one, and gear one is connected with fixed rack engagement, and the middle part fixed mounting of dwang one has the transmission pinion to can effectually adjust supporting component, make supporting component can effectually support L shape sliding plate and extension loading board.

Preferably, the both ends of lift platform connecting seat are all rotated and are installed dwang two, and the middle part fixed mounting of dwang two has worm wheel and transmission gear wheel, and the transmission gear wheel is connected with the meshing of transmission pinion to can effectually transmit.

Preferably, transmission assembly includes axis of rotation and two mounting panels, and two mounting panels fixed mounting are at the both ends of lift platform connecting seat, and the axis of rotation rotates to be installed between two mounting panels, and the both ends of axis of rotation all are equipped with the worm section, and the worm section is connected with the meshing of worm wheel.

Preferably, a first bevel gear is fixedly mounted in the middle of the rotating shaft, a second bevel gear is fixedly mounted at the other output end of the double-output-shaft motor, and the second bevel gear is meshed with the first bevel gear, so that effective power can be provided.

Preferably, the concave circular groove has been seted up at the top of disc, and the circle piece is pegged graft in the inside of concave circular groove, and two V-arrangement grooves have been seted up at the top of circle piece, and the bottom fixed mounting of main loading board has two ejector pins, and the ball is installed to the bottom of two ejector pins, and ejector pin and ball are located the inside in V-arrangement groove to can effectually carry out the top to main loading board and move and shift up the regulation.

Preferably, the reset connection spare all includes perpendicular piece and inserted block, and perpendicular piece and inserted block difference fixed mounting have been seted up at lift platform connecting seat and main loading board side in one side of perpendicular piece and erect the groove, and inserted block sliding clamping connects in the inside of erecting the groove, and is connected with the spring between the bottom in perpendicular groove and the tip of inserted block to can effectually move the regulation on to main loading board.

Preferably, sliding grooves are formed in two ends of two sides of the inside of the U-shaped fixing seat, and the L-shaped sliding plate is connected to the inside of the sliding grooves in a sliding and clamping mode, so that the extension bearing plate can be stably and effectively moved and adjusted.

Compared with the prior art, the invention has the beneficial effects that:

(1) in the work, the lifting platform has an expanded function by arranging the lifting platform connecting seat, the U-shaped fixing seat, the main bearing plate, the reset connecting piece, the expanded bearing plate, the L-shaped sliding plate, the supporting component, the transmission component, the double-output shaft motor, the disc and the round block, the lifting platform can be adjusted according to the use requirement to load and transport more goods, and the operation range of workers can be expanded after the lifting platform is expanded, so that the workers can load and unload at the position close to the lifting platform, the use performance of the lifting platform is effectively improved, and the lifting platform is more convenient and fast in the use process; meanwhile, the expansion adjustment operation of the lifting platform is simple, convenient, stable and reliable; therefore, the lifting platform with the extensible lifting area can meet the use requirements of people.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is an enlarged schematic view of the structure at the point A in FIG. 2 according to the present invention;

FIG. 4 is a schematic cross-sectional view of FIG. 2 in accordance with the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4;

FIG. 6 is a schematic structural view of a kit according to the present invention;

FIG. 7 is a schematic cross-sectional view of FIG. 6 in accordance with the present invention;

FIG. 8 is a schematic cross-sectional view of the U-shaped fixing base of the present invention;

FIG. 9 is a schematic top view of a disk according to the present invention;

FIG. 10 is a side cross-sectional view of the reset connector of the present invention;

in the figure: 1. a lifting platform connecting seat; 2. a U-shaped fixed seat; 3. a main bearing plate; 4. a reset connector; 401. a vertical block; 402. inserting a block; 403. a vertical slot; 404. a spring; 5. expanding the bearing plate; 6. an L-shaped sliding plate; 7. a support assembly; 701. a fixing plate; 702. a support panel; 703. a sleeve box; 704. a first bearing; 705. a connecting pin; 707. a long slot opening; 708. fixing a rack; 8. a transmission assembly; 801. a rotating shaft; 802. mounting a plate; 803. a worm section; 804. a first bevel gear; 9. a double output shaft motor; 901. a second bevel gear; 10. a disc; 1001. connecting a curved bar; 1002. a concave circular groove; 1003. a V-shaped groove; 1004. a top rod; 11. a round block; 12. a second bearing; 13. rotating the first rod; 14. a first gear; 15. a drive pinion; 16. rotating the second rod; 17. a worm gear; 18. a driving gearwheel; 19. a sliding groove.

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; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the first embodiment, as shown in fig. 1 to 10, the present invention includes a lifting platform connecting seat 1, a U-shaped fixing seat 2 is fixedly installed on the top of the lifting platform connecting seat 1, a main bearing plate 3 is installed on the top of the U-shaped fixing seat 2, two restoring connecting members 4 are connected between both sides of the main bearing plate 3 and both sides of the lifting platform connecting seat 1, two ends of the main bearing plate 3 are respectively provided with an extension bearing plate 5, the bottom of the extension bearing plate 5 is symmetrically and fixedly installed with a pair of L-shaped sliding plates 6, the L-shaped sliding plates 6 are both installed inside the U-shaped fixing seat 2, a supporting assembly 7 is installed between the bottoms of the pair of L-shaped sliding plates 6, one side of the supporting assembly 7 is installed on the end of the lifting platform connecting seat 1, a transmission assembly 8 is installed inside the lifting platform connecting seat 1, both ends of the transmission assembly 8 are respectively connected with the two supporting assemblies 7 in a transmission manner, a double-shaft motor 9 is installed on the bottom of the U-shaped fixing seat 2, a disc 10 is installed on the inner side of the U-shaped fixed seat 2, one output end of a double-output-shaft motor 9 penetrates through the U-shaped fixed seat 2 and is fixedly connected with the bottom of the disc 10, the other output end of the double-output-shaft motor 9 is in transmission connection with a transmission assembly 8, a round block 11 is installed at the bottom of the main bearing plate 3, the round block 11 is installed at the top of the disc 10, two connecting curved rods 1001 are rotatably installed on the circumferential surface of the disc 10, and one ends of the two connecting curved rods 1001 are respectively in rotation connection with the bottoms of the two extension bearing plates 5; the two ends of the two sides in the U-shaped fixed seat 2 are respectively provided with a sliding groove 19, and the L-shaped sliding plate 6 is slidably clamped in the sliding grooves 19, so that the extension bearing plate 5 can stably and effectively move and adjust, and the L-shaped sliding plate 6 can slide and move in the sliding grooves 19 by the movement of the extension bearing plate 5, so that the adjustment stability of the extension bearing plate 5 is ensured;

the supporting component 7 comprises a fixed plate 701 and two supporting laths 702, the fixed plate 701 is fixedly arranged at the bottoms of the pair of L-shaped sliding plates 6, the two supporting laths 702 are rotatably connected at the two ends of the fixed plate 701, sleeve boxes 703 are respectively arranged on the surfaces of the two supporting laths 702, a first bearing 704 is respectively arranged on one side of each sleeve box 703, a connecting pin 705 is respectively fixedly arranged in the middle of each first bearing 704, and one end of each connecting pin 705 is fixedly connected with the lifting platform connecting seat 1, so that the connection can be effectively carried out; one side of each supporting lath 702 is provided with a long notch 707, fixed laths 708 are arranged in the long notches 707, and the supporting laths 702 are movably inserted in the sleeve boxes 703; the other sides of the two opposite sleeve boxes 703 are both provided with a second bearing 12, a first rotating rod 13 is fixedly arranged between the middles of the second bearing 12, both ends of the first rotating rod 13 extend into the two sleeve boxes 703 and are provided with a first gear 14, the first gear 14 is meshed with the fixed rack 708, and a transmission pinion 15 is fixedly arranged in the middle of the first rotating rod 13, so that the supporting component 7 can be effectively adjusted, and the supporting component 7 can effectively support the L-shaped sliding plate 6 and the extended bearing plate 5;

as shown in the drawing, the lifting platform is in an unfolded state, and simultaneously, the L-shaped sliding plate 6 and the extension bearing plate 5 can be stably and effectively supported by the fixing plate 701 and the two supporting strips 702, so as to ensure the stability of the extension bearing plate 5 for loading goods, and the first gear 14 is meshed with the fixing rack 708, so that when the first gear 14 does not rotate, the supporting strips 702 can be stably supported;

when the two extension bearing plates 5 need to be contracted and adjusted, the two extension bearing plates 5 are accommodated at the bottom of the main bearing plate 3 and are positioned inside the U-shaped fixed seat 2; by rotating the first rotating rod 13, the rotation of the first rotating rod 13 drives the first two gears 14 to rotate, and since the first gears 14 are meshed with the fixed rack 708, the rotation of the first gears 14 can drive the supporting lath 702 to move through the fixed rack 708, and the movement of the supporting lath 702 can penetrate through the sleeve box 703 and be inserted into the interior of the lifting platform connecting base 1;

the movement of the supporting plate strip 702 can drive the fixed plate 701 and the pair of L-shaped sliding plates 6 to move, and the movement of the pair of L-shaped sliding plates 6 can drive the extension bearing plate 5 to move and be accommodated in the U-shaped fixed seat 2; the movement of the extension bearing plate 5 drives the support strip 702 to rotate, the rotation of the support strip 702 drives the sleeve box 703 to rotate, and the rotation of the sleeve box 703 rotates around the rotation rod 13 through the second bearing 12, so that the support assembly 7 can be effectively adjusted.

In the second embodiment, on the basis of the first embodiment, the two ends of the lifting platform connecting seat 1 are both rotatably provided with the second rotating rods 16, the middle parts of the second rotating rods 16 are fixedly provided with the worm gears 17 and the large transmission gears 18, and the large transmission gears 18 are meshed with the small transmission gears 15, so that transmission can be effectively carried out; the transmission assembly 8 comprises a rotating shaft 801 and two mounting plates 802, the two mounting plates 802 are fixedly mounted at two ends of the lifting platform connecting seat 1, the rotating shaft 801 is rotatably mounted between the two mounting plates 802, worm sections 803 are respectively arranged at two ends of the rotating shaft 801, and the worm sections 803 are meshed with the worm wheel 17; a first bevel gear 804 is fixedly installed in the middle of the rotating shaft 801, a second bevel gear 901 is fixedly installed at the other output end of the double-output-shaft motor 9, and the second bevel gear 901 is meshed with the first bevel gear 804, so that effective power can be provided;

during adjustment, the double-output-shaft motor 9 is started, the double-output-shaft motor 9 drives the second bevel gear 901 to rotate and transmits and rotates the first bevel gear 804, the rotation of the first bevel gear 804 can drive the rotation shaft 801 to rotate, the rotation of the rotation shaft 801 can drive the two worm sections 803 to rotate, the rotation of the worm sections 803 can transmit and rotate the worm wheel 17, the rotation of the worm wheel 17 can drive, the second rotating rod 16 and the large transmission gear 18 rotate, the rotation of the large transmission gear 18 can accelerate the transmission and rotation of the small transmission gear 15, and the rotation of the small transmission gear 15 can drive the first rotating rod 13 to rotate and adjust.

In the third embodiment, on the basis of the first embodiment, the top of the disc 10 is provided with a concave circular groove 1002, the round block 11 is inserted into the concave circular groove 1002, the top of the round block 11 is provided with two V-shaped grooves 1003, the bottom of the main bearing plate 3 is fixedly provided with two push rods 1004, the bottoms of the two push rods 1004 are provided with balls, and the push rods 1004 and the balls are located inside the V-shaped grooves 1003, so that the main bearing plate 3 can be effectively pushed to move and be adjusted to move upwards; the reset connecting pieces 4 respectively comprise vertical blocks 401 and inserting blocks 402, the vertical blocks 401 and the inserting blocks 402 are respectively and fixedly installed on the side edges of the lifting platform connecting seat 1 and the main bearing plate 3, vertical grooves 403 are formed in one sides of the vertical blocks 401, the inserting blocks 402 are slidably clamped in the vertical grooves 403, and springs 404 are connected between the bottoms of the vertical grooves 403 and the end portions of the inserting blocks 402, so that the main bearing plate 3 can be effectively adjusted to move upwards;

when the two extension bearing plates 5 need to be contracted and adjusted, the two extension bearing plates 5 are accommodated at the bottom of the main bearing plate 3 and are positioned inside the U-shaped fixed seat 2; by starting the double-output-shaft motor 9, the double-output-shaft motor 9 drives the disc 10 to rotate, the rotation of the disc 10 can drive the V-shaped groove 1003 to rotate, so that the ejector rod 1004 and the ball move out of the V-shaped groove 1003, the ejector rod 1004 and the ball move to the top of the disc 10 to eject and move up the main bearing plate 3, the upward movement of the main bearing plate 3 can drive the vertical block 401 to move up, and the upward movement of the vertical block 401 can compress the spring 404 through the insertion block 402;

the rotation of the disc 10 drives the two connecting curved bars 1001 to rotate, the two connecting curved bars 1001 move to push the extension bearing plate 5 to move first, and then the extension bearing plate 5 is pulled to move, so that the two extension bearing plates 5 move relatively to move into the U-shaped fixing base 2 and the bottom of the main bearing plate 3, as shown in fig. 9, the two connecting curved bars 1001 are in a contracted state.

The lifting platform has an expansion function, can be adjusted according to use requirements to load and transport more goods, and can improve the operation range of workers after the lifting platform is expanded, so that the workers can load and unload at the position close to the lifting platform, thereby effectively improving the use performance of the lifting platform and leading the lifting platform to be more convenient and convenient in the use process; meanwhile, the expansion adjustment operation of the lifting platform is simple, convenient, stable and reliable; therefore, this lift platform that area can extend can satisfy people's user demand.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a lift platform that area can extend, includes lift platform connecting seat (1), its characterized in that: the lifting platform is characterized in that a U-shaped fixed seat (2) is fixedly arranged at the top of the lifting platform connecting seat (1), a main bearing plate (3) is arranged at the top of the U-shaped fixed seat (2), two reset connecting pieces (4) are respectively connected between two sides of the main bearing plate (3) and two sides of the lifting platform connecting seat (1), extension bearing plates (5) are respectively arranged at two ends of the main bearing plate (3), a pair of L-shaped sliding plates (6) are symmetrically and fixedly arranged at the bottoms of the extension bearing plates (5), the L-shaped sliding plates (6) are respectively arranged in the U-shaped fixed seat (2), a supporting component (7) is arranged between the bottoms of the pair of L-shaped sliding plates (6), one side of the supporting component (7) is arranged at the end part of the lifting platform connecting seat (1), a transmission component (8) is arranged in the lifting platform connecting seat (1), and two ends of the transmission component (8) are respectively in transmission connection with the two supporting components (7), the bottom of the U-shaped fixing seat (2) is provided with a double-output-shaft motor (9), the inner side of the U-shaped fixing seat (2) is provided with a disc (10), one output end of the double-output-shaft motor (9) penetrates through the U-shaped fixing seat (2) and is fixedly connected with the bottom of the disc (10), the other output end of the double-output-shaft motor (9) is in transmission connection with a transmission assembly (8), the bottom of the main bearing plate (3) is provided with a round block (11), the round block (11) is arranged at the top of the disc (10), the circumferential surface of the disc (10) is rotatably provided with two connecting curved rods (1001), and one ends of the two connecting curved rods (1001) are respectively in rotary connection with the bottoms of the two extension bearing plates (5);

supporting component (7) are including fixed plate (701) and two supporting laths (702), fixed plate (701) fixed mounting is in the bottom of a pair of L shape sliding plate (6), two supporting laths (702) rotate the both ends of connecting at fixed plate (701), the cover box (703) are all installed on the surface of two supporting laths (702), bearing (704) are all installed to one side of cover box (703), the equal fixed mounting in middle part of bearing (704) has connecting pin (705), the one end of connecting pin (705) all with lift platform connecting seat (1) fixed connection.

2. The extendable lifting platform of claim 1, wherein: the long notch (707) has all been seted up to one side of support lath (702), and fixed rack (708) are all installed to the inside of long notch (707), and support lath (702) activity is pegged graft in the inside of cover box (703).

3. The extendable lifting platform of claim 2, wherein: two relatively the other side of cover box (703) all installs bearing two (12), and fixed mounting has dwang one (13) between the middle part of two bearing two (12), and the both ends of dwang one (13) all extend to the inside of two cover boxes (703) and install gear one (14), and gear one (14) and fixed rack (708) meshing are connected, and the middle part fixed mounting of dwang one (13) has transmission pinion (15).

4. The extendable lifting platform of claim 3, wherein: the both ends of lift platform connecting seat (1) are all rotated and are installed dwang two (16), and the middle part fixed mounting of dwang two (16) has worm wheel (17) and transmission gear wheel (18), and transmission gear wheel (18) are connected with transmission pinion (15) meshing.

5. The extendable lifting platform of claim 4, wherein: drive assembly (8) include axis of rotation (801) and two mounting panels (802), two mounting panels (802) fixed mounting are at the both ends of lift platform connecting seat (1), and axis of rotation (801) rotates to be installed between two mounting panels (802), and the both ends of axis of rotation (801) all are equipped with worm section (803), and worm section (803) are connected with the meshing of worm wheel (17).

6. The extendable lifting platform of claim 5, wherein: the middle part of the rotating shaft (801) is fixedly provided with a first bevel gear (804), the other output end of the double-output-shaft motor (9) is fixedly provided with a second bevel gear (901), and the second bevel gear (901) is meshed with the first bevel gear (804).

7. The extendable lifting platform of claim 1, wherein: concave circular groove (1002) have been seted up at the top of disc (10), and round block (11) are pegged graft in the inside of concave circular groove (1002), and two V-arrangement grooves (1003) have been seted up at the top of round block (11), and the bottom fixed mounting of main loading board (3) has two ejector pins (1004), and the ball is installed to the bottom of two ejector pins (1004), and ejector pin (1004) and ball are located the inside of V-arrangement groove (1003).

8. The extendable lifting platform of claim 7, wherein: reset connection spare (4) all include perpendicular piece (401) and inserted block (402), and perpendicular piece (401) and inserted block (402) are fixed mounting respectively at lift platform connecting seat (1) and main loading board (3) side, and perpendicular groove (403) have been seted up to one side of perpendicular piece (401), and inserted block (402) slip joint is in the inside of erecting groove (403), and is connected with spring (404) between the bottom of erecting groove (403) and the tip of inserted block (402).

9. The extendable lifting platform of claim 1, wherein: the two ends of the two sides in the U-shaped fixed seat (2) are both provided with sliding grooves (19), and the L-shaped sliding plate (6) is slidably clamped in the sliding grooves (19).