CN211548973U - Lifting telescopic stand - Google Patents

Abstract

The utility model discloses a flexible stand goes up and down, including preceding, back stand, support frame and crane, preceding stand is the same with the structure of back stand, is the extending structure who constitutes to the multilayer support of range upon range of setting by the front and back, all is equipped with the one deck on every layer of support and sees the platen, see the platen highly rise to the back successive layer by the front layer of seeing the stand, the support frame be around to the multilayer extending structure of range upon range of setting, the height of support frame and preceding stand on last one deck see the platen highly match, the crane is located the rear side of support frame. The utility model discloses a flexible stand goes up and down can improve the seat number of piles and the seat number of a position of stand by a wide margin, can satisfy large-scale performance, meeting place needs, can also make up into interim platform, has very high practical value.

Description

Lifting telescopic stand

Technical Field

The utility model relates to a movable stand technical field, concretely relates to can improve the seat number of piles of stand by a wide margin, can satisfy the flexible stand of lift that large-scale performance, meeting place need.

Background

The temporary telescopic grandstand in the prior art is generally low in floor height, and the number of seats which can be accommodated by the grandstand is limited, so that the needs of large-scale performance and meeting places cannot be met. If the number of layers is increased on the basis of the telescopic stand in the prior art, the instability of the stand is easily caused due to the fact that the number of the layers of the telescopic stand legs is large; meanwhile, the height of the contracted stand is too high due to the overhigh support structure, so that the transportation of the stand is influenced. On the other hand, because the telescopic bleachers are usually applied to temporary places, sometimes a temporary platform is required to be built to be used as a larger performance stage, and the like, but the telescopic bleachers in the prior art can only be used as bleachers, cannot be combined into other functional components, and have single functions. Chinese patent document No. CN 104213726 a, published as 2014, 12 and 17, discloses a telescopic modular stand and a combination thereof, wherein the telescopic modular stand comprises: the container lifting device comprises a square main body frame, a multi-layer stand plate arranged on the main body frame and a seat arranged on the stand plate, wherein the stand plate can be pulled open to be in a step shape or contracted to be in a stacked shape, a connecting interface connected with a container lifting device is arranged at the top of the main body frame, and a connecting interface connected with a stacking device of containers is arranged at the bottom of the main body frame. The telescopic modular stand can be combined into a transportation assembly equivalent to a standard container of 20 feet in a pairwise combination mode, or combined into a transportation assembly equivalent to a standard container of 40 feet in a four combination mode, so that the problems of inconvenience in loading, unloading, bundling, field installation and the like in the transportation process of the telescopic modular stand are solved, and the transportation efficiency of the modular stand is improved. But this telescopic modularization stand mainly solves a great deal of inconvenient problems such as loading, uninstallation, tie up and field installation in the stand transportation, has improved the conveying efficiency of modularization stand. The number of seats of the stand is not high due to the limitation of the height of a standard container, and the number of seats on a single-layer seat is small, so that the needs of large-scale performance and meeting places cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can improve the seat number of piles and the seat number of bits of stand by a wide margin, can satisfy the flexible stand of lift that large-scale performance, meeting place need for the problem that the flexible stand number of piles lower, can hold of solving prior art can not satisfy the needs in large-scale performance, meeting place.

The utility model discloses a still another purpose is for solving prior art's flexible stand and can only regard as the stand to use, the problem of function singleness, provides one kind and can make up into temporary platform, satisfies more actual need's flexible stands of lift.

The utility model adopts the technical proposal that the lifting telescopic stand comprises a stand, a support frame and a lifting frame, wherein the stand comprises a front stand and a rear stand, the front stand and the rear stand have the same structure, the front stand and the rear stand are both of a telescopic structure formed by a plurality of layers of supports which are arranged in a front-back direction in a stacking way, the height of the rear layer of the supports is greater than that of the front layer of the supports, each layer of supports is provided with a stand plate, the height of the stand plate is increased from the front layer of the stand to the rear layer of the stand layer by layer, the support frame is of a multi-layer telescopic structure which is arranged in a front-back direction in a stacking way, the height of the support frame is equivalent to that of the last stand plate on the front stand, the lifting frame is positioned at the rear side of the support frame, the lifting frame is provided with a lifting motor for driving the rear stand to lift, the lower part of the front layer stand board of the stand and the lower part of the front layer of the support frame are both provided with telescopic motors used for driving the stand or the support frame to stretch. When the lifting telescopic stand is used, the lifting frame lifts the rear stand in a contraction state to the support frame in the contraction state, the rear stand and the support frame are pulled forwards to be stretched, the front stand is arranged on the front side of the support frame after being unfolded, the rear end of the front stand is tightly attached to the front end of the support frame, the front stand is pulled forwards to be stretched, and the front stand and the stand board behind the rear stand form a continuous ladder-shaped structure. The utility model discloses a flexible stand goes up and down includes preceding stand and back stand, and preceding, back stand are the multilayer extending structure to range upon range of setting to the preceding, and wherein back stand setting is on the support frame, and the support frame is the front and back to multilayer extending structure such as the height of range upon range of setting, and its top structure matches with the bottom structure of back stand, and back stand sets up on the support frame when the flexible stand that goes up and down expandes, and both can stretch out and draw back in step. The utility model discloses the stand rear side sets up the crane after seeing for on promoting the back stand that is in the contraction state to the support frame, see the stand after rising and pull open forward with the support frame and extend and lock, constitute continuous echelonment structure with the preceding stand that is in the extension state, like this the utility model discloses expand the number of piles and the seat number of a height of flexible stand greatly, realized piling up of minimum height simultaneously, thereby save a large amount of spaces, solved that the flexible stand number of piles is lower, the seat quantity that can hold of the number of piles of a layer of prior art is limited, can not satisfy the problem of large-scale performance, the needs in meeting place.

Preferably, the stand plate is provided with a detachable folding seat, the height of the folded seat is lower than the height difference between two adjacent stand plates, two ends of each stand plate are provided with fences, the fences are fixedly spliced with the stand plate, and the upper ends of the fences are outwards in an inclined structure; when the lifting telescopic stand is contracted, the fences at two sides of the stand plate on the upper layer are contracted in the fences at two sides of the stand plate on the lower layer. Although spectators can directly sit on the stand board to watch programs, the stand board is provided with the detachable folding seat, and the folding seat can be assembled according to different requirements, so that the comfort of spectators is improved. Additionally, the utility model discloses a height difference that folding seat highly is less than two adjacent stand boards after folding, folding seat can get into between two upper and lower stand boards when the stand shrink, consequently can not influence the shrink of flexible stand. In addition, the rail is used for shielding the two ends of the stand plate and preventing the audience from falling off. The fence with the outer inclined structure can be stacked up and down when the lifting telescopic stand contracts, and the contraction of the lifting telescopic stand cannot be influenced.

Preferably, the lifting frame is semi-surrounded on the rear stand frame in a contraction state from the rear side and the two sides, the lifting motor is connected with winches arranged on the two sides through a transmission shaft, steel wire ropes on the winches on the two sides are fixed with a cross frame through pulley mechanisms, and the rear stand frame is placed on the cross frame. The transverse frame is used for placing the rear viewing platform frame and lifting along with the lifting of the transverse frame. The lifting frame is in a frame shape with an opening at one side, the rear stand frame in a contraction state is surrounded from the rear side and the two sides, the rear stand frame is placed on the transverse frame which can be lifted, when the rear stand frame needs to be unfolded for use, the lifting motor lifts the transverse frame and the rear stand frame on the transverse frame through the winches at the two sides and moves the transverse frame and the rear stand frame to the supporting frame, and therefore the rear stand frame and the supporting frame can be unfolded and locked together; when the rear stand needs to be retracted, the rear stand and the support frame are unlocked and are retracted synchronously to move to the cross frame, and the lifting motor lowers the cross frame and the rear stand on the cross frame to the ground through winches on two sides.

Preferably, the four corners of the lifting frame are provided with supporting feet, each supporting foot comprises a cross arm extending outwards from the four corners of the lifting frame, a screw rod nut is arranged on each cross arm, the screw rod is in threaded connection with the screw rod nut, a hand wheel is arranged at the top end of each screw rod, and a supporting plate is arranged at the bottom end of each screw rod. The supporting legs are fixed with ground when the crane carries out lifting operation, and the ground wheel of avoiding the crane bottom takes place to roll when the crane carries out lifting operation and influences the lift. The supporting legs are of a telescopic structure, and can extend downwards to support the ground through the supporting plate by rotating the hand wheel when needed, the bottom surface of the supporting plate is higher than that of the land wheel at ordinary times, and the supporting legs are in a suspended state.

Preferably, the support includes that a plurality of groups set up in pairs, and the interval between two stands of back is greater than the interval between two stands of front, the rear side of seeing the platform board is fixed on the upper portion of stand, and the top of stand is higher than the stand board, and the stand leading flank of stand board top is equipped with the riser, and the riser constitutes the vertical face and the horizontal plane of lift flexible stand stair structure with the stand board respectively, and the top surface of stand is equipped with the running roller, and when lift flexible stand expanded, the preceding side bottom surface of upper strata (back) seeing the platform board erects on the running roller of lower floor (front) stand top surface. Because the number of seats on each row of seats is more, the bracket adopts a plurality of groups of stand columns which are arranged in pairs for supporting the stand, the distance between two stand columns on the rear layer of each group is larger than the distance between two stand columns on the front layer, and the stand columns are convenient to be mutually stacked when the stand columns shrink; the top surface of the upright post is provided with the roller which can be used for supporting the upper watching plate (so that the last layer is not arranged) and is convenient to slide into the lower part of the upper watching plate when being contracted.

Preferably, the upright columns are L-shaped, cross bars are fixed at the bottoms of the upright columns, land wheels are arranged at the bottoms of the cross bars, the upright cross bars of the rear layer of supports are slidably connected to the outer sides of the upright cross bars of the front layer of supports, connecting rods are transversely arranged at the lower parts of the upright columns of the same group, inclined support rods are further arranged on the upright columns, the lower ends of the inclined support rods are fixed with the end parts of the connecting rods, the upper ends of the inclined support rods are fixed with the rear sides of the viewing platform plates, and the inclined support rods. The contact length of the bottom of the upright post and the ground can be increased by the cross bar, so that a stabilizing effect is achieved; the upright post cross rod of the bracket at the rear layer can be slidably connected with the outer side of the upright post cross rod of the bracket at the front layer, so that the bracket can be conveniently stretched; the connecting rods and the inclined stay bars on the stand columns are used for strengthening the structural strength of the support.

Preferably, the folding seat comprises a rectangular seat, the bottom surface of the rectangular seat is tightly attached to the stand plate, the rear side surface of the rectangular seat is tightly attached to the vertical plate, fastening joints are arranged on the bottom surface and the rear side surface of the rectangular seat, fastening grooves corresponding to the fastening joints are arranged on the stand plate and the vertical plate, the fastening grooves in the vertical plate are L-shaped, the folding seat is fixed to the stand plate and the vertical plate through the fastening joints and the fastening grooves, and an anti-disengagement mechanism of the folding seat is further arranged on the stand plate. Folding seat passes through rectangle seat and stand board and riser lock joint, can make things convenient for the dismouting, and the lock joint groove that is L shape can make whole row of folding seat insert the lock joint in proper order in a direction, and the inserted seat in back becomes the preceding obstacle that inserts the seat, consequently only needs to set up one department's anti-disengaging mechanism in last inserted position, can prevent deviating from of whole row of folding seat, ensures whole row of folding seat's firm, makes things convenient for the dismantlement of folding seat simultaneously greatly.

Preferably, the height difference of the two adjacent viewing platforms on the front viewing platform or the rear viewing platform is the same; the front side of the front layer (the first layer) of the rear stand and the rear side of the rear layer of the front stand are both provided with hinge lugs, the hinge lugs are provided with hinge shaft holes, and when the rear stand is lifted to the support frame in a contraction state, the hinge lugs on the rear stand are hinged with the hinge lugs on the front stand through (inserted) hinge shafts; the front stand and the rear stand are pulled open and extended towards one side far away from the support frame, and the front stand and the rear stand are overlapped up and down in the opposite direction to form a platform-shaped structure. Under the condition of not installing folding seat chair, the utility model discloses a preceding stand rear portion upper end can be articulated with the front portion of back stand, can form reverse overlapping formation platform structure when current, back stand expand like this, can regard as interim performance platform to use, has avoided the problem of the stand function singleness that stretches out and draws back among the prior art, has improved the utilization ratio of the stand that stretches out and draws back greatly.

Preferably, the number of layers of the support frame is the same as that of the rear stand, each layer of the support frame is of an equal-height structure, the top structure of the support frame is matched with the bottom structure of the rear stand, the top of the support frame is provided with a positioning groove for fixing the bottom of the rear stand, and the bottom of the support frame is provided with a land wheel. The number of piles of support frame is the same with the number of piles of back stand, and the top structure of support frame and the bottom structure looks adaptation of back stand, the top of support frame is embedded into to the bottom one-to-one of back stand during the installation, can increase the steadiness of back stand and conveniently realize synchronous flexible.

Preferably, the telescopic motor is arranged between the two upright posts in the same group, the telescopic motor drives the roller through a chain, and the roller is provided with a traction rope; a speed reducer is arranged between the lifting motor and the transmission shaft, the rear end of the lifting motor is connected with a manual wheel, the transmission shaft is further connected with a cam switch and an encoder which are used for controlling the lifting motor to decelerate and stop, and the bottoms of the lifting frame and the stand are provided with fixing plates which can be fixed with the ground. The telescopic motor drives the traction rope on the roller through the chain to realize the telescopic effect of the front and rear viewing platforms and the support frame. A speed reducer is arranged between the lifting motor and the transmission shaft and is used for reducing the lifting speed of the rear viewing platform; can realize manual lift through manual wheel, cam switch and encoder are used for controlling the rotation number of turns of transmission shaft, realize the accurate lift of back stand, the utility model discloses a cam switch can set up a plurality of action points.

Preferably, 10-12 rows of seats are arranged on the front and rear viewing stands, each row of seats is provided with 20-25 seats, the seats are arranged in different areas, an aisle is arranged between two adjacent areas, and the number of the seats on the whole lifting telescopic stand is 400-600. Compared with the telescopic bleachers in the prior art, the utility model discloses a flexible bleacher seat quantity has increased more than half, can satisfy large-scale performance, meeting place needs.

The utility model has the advantages that: it is lower, the seat quantity that can hold that it has solved the flexible stand number of piles of prior art effectively is limited, can not satisfy the problem of the needs in large-scale performance, meeting place, has still solved the flexible stand of prior art and can only regard as the stand to use, the problem of function singleness, the utility model discloses a flexible stand that goes up and down can improve the seat number of piles and the seat number of piles of stand by a wide margin, can satisfy large-scale performance, meeting place needs, can also make up into temporary platform, has very high practical value.

Drawings

Fig. 1 is a schematic side structure view of an expanded state of an embodiment 1 of the lifting telescopic bleacher of the present invention;

fig. 2 is a schematic side structure view of the embodiment 2 of the telescopic lifting/lowering stand of the present invention in an unfolded state;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a schematic view of a backward structure of a telescopic bleacher of the present invention in a contracted state in embodiment 3;

fig. 5 is a schematic side view of the telescopic bleacher of the present invention in a contracted state according to embodiment 2;

fig. 6 is a schematic side structure view of the telescopic bleacher of the present invention in a contracted state in embodiment 3;

figure 7 is a side structure schematic diagram of the lifting frame of the utility model;

fig. 8 is a rear structure diagram of the lifting frame of the utility model;

fig. 9 is a schematic side view of the embodiment 3 of the telescopic lifting/lowering stand according to the present invention in an expanded state;

fig. 10 is a schematic side view of the embodiment 4 of the telescopic lifting/lowering stand according to the present invention in an expanded state;

fig. 11 is another schematic side view of the lifting telescopic bleacher of the present invention in an unfolded state in embodiment 4;

FIG. 12 is a schematic side view of the foldable seat of the present invention when it is unfolded;

fig. 13 is a schematic side view of the folding seat of the present invention when it is laid down.

In the figure: 1. the lifting device comprises a supporting frame, 2, a lifting frame, 3, a front viewing rack, 4, a rear viewing rack, 5, a support, 6, a viewing platform plate, 7, a folding seat, 8, a fence, 9, a lifting motor, 10, a transmission shaft, 11, a winch, 12, a steel wire rope, 13, a pulley mechanism, 14, a cross frame, 15, a cross arm, 16, a lead screw nut, 17, a lead screw, 18, a hand wheel, 19, a supporting plate, 20, a stand column, 21, a vertical plate, 22, a roller, 23, a cross bar, 24, a ground wheel, 25, a connecting rod, 26, an inclined strut bar, 27, a rectangular seat, 28, a fastening head, 29, a rear viewing rack front layer, 30, a front viewing rack rear layer, 31, a hinge lug, 32, a hinge shaft, 33, a telescopic motor, 34, a speed reducer, 35, a manual wheel, 36, a cam switch, 37, 38 and.

Detailed Description

The following provides a further description of embodiments of the present invention with reference to the accompanying drawings.

Example 1

In embodiment 1 shown in fig. 1, a lifting telescopic stand comprises a stand frame, a support frame 1 and a lifting frame 2, wherein the stand frame comprises a front stand frame 3 and a rear stand frame 4, the front stand frame and the rear stand frame are both telescopic structures formed by a plurality of layers of supports 5 which are arranged in a front-back direction in a stacking manner, the height of the rear layer of supports is greater than that of the front layer of supports, each layer of supports is provided with a stand plate 6, the height of the stand plates is gradually increased from the front layer of the stand frame to the rear layer of the stand frame, the support frame is a plurality of layers of telescopic structures which are arranged in a front-back direction in a stacking manner, the height of the support frame is equivalent to that of the last stand plate on the front stand frame, and the lifting frame is positioned at the rear side of the support frame; when the lifting telescopic stand is used, the lifting frame lifts the rear stand in a contraction state to the support frame in the contraction state, the rear stand and the support frame are pulled forwards to be stretched, the front stand is arranged on the front side of the support frame after being unfolded, the rear end of the front stand is tightly attached to the front end of the support frame, the front stand is pulled forwards to be stretched, and the front stand and the stand board behind the rear stand form a continuous ladder-shaped structure.

The lifting frame (see fig. 7 and 8) is semi-surrounded on the rear stand in a contraction state from the rear side and two sides, a lifting motor 9 for driving the rear stand to lift is arranged on the lifting frame, the lifting motor is connected with winches 11 arranged on two sides through a transmission shaft 10, steel wire ropes 12 on the winches on the two sides are fixed with a cross frame 14 through pulley mechanisms 13, and the rear stand is placed on the cross frame. Supporting legs are arranged at four corners of the lifting frame, the supporting legs comprise cross arms 15 extending outwards at the four corners of the lifting frame, screw nuts 16 arranged on the cross arms and screw rods 17 connected with the screw nuts in a threaded mode, hand wheels 18 are arranged at the top ends of the screw rods, and supporting plates 19 are arranged at the bottom ends of the screw rods.

The support includes three group stand 20 (see fig. 4) that set up in pairs, and the interval between two stands of back is greater than the interval between two stands of front, the rear side of stand board is fixed on the upper portion of stand, and the top of stand is higher than the stand board, and the stand leading flank of stand board top is equipped with riser 21, and the riser constitutes the vertical face and the horizontal plane of flexible stand stair structure of lift with the stand board respectively, and the top surface of stand is equipped with running roller 22, and when the flexible stand of lift expandes, the front side bottom surface of upper strata (the back that is to arranging around promptly) stand board erects on the running roller of the lower floor (the front that is to arranging around promptly) stand board top surface. The stand is L-shaped, a cross rod 23 is fixed at the bottom of the stand, a land wheel 24 is arranged at the bottom of the cross rod, the stand cross rod of the support in the rear layer can be connected to the outer side of the stand cross rod of the support in the front layer in a sliding mode, a connecting rod 25 is transversely arranged at the lower part of the stand in the same group, an inclined strut 26 is further arranged on the stand, the lower end of the inclined strut is fixed with the end part of the connecting rod, the upper end of the inclined strut is fixed with the rear side of the watching platform plate, and.

The number of piles of support frame is the same with the number of piles of back stand, and each layer of support frame is equal altitude structure and its top structure looks the bottom structure looks adaptation of rack after with, and the support frame top is equipped with the constant head tank that is used for fixed back to see rack bottom, and the support frame bottom is equipped with the land wheel.

Telescopic motors 33 for driving the stand frame or the support frame to stretch and retract are arranged below the front layer stand board of the stand frame and the lower part of the front layer of the support frame, the telescopic motors are arranged between the two stand columns in the same group, the telescopic motors drive rollers through chains, and traction ropes are arranged on the rollers; a speed reducer 34 is arranged between the lifting motor and the transmission shaft, the rear end of the lifting motor is connected with a manual wheel 35, the transmission shaft is also connected with a cam switch 36 and an encoder 37 which are used for controlling the speed reduction and stop of the lifting motor, and the bottoms of the lifting frame and the stand are respectively provided with a fixing plate which can be fixed with the ground. In this embodiment, the front and rear viewing stands are provided with 11 rows of seats, each row of seats is provided with 20 seats, and the number of the seats on the whole lifting telescopic viewing stand is 440.

Example 2

The stand board of the embodiment 2 is provided with a detachable folding seat 7 (see fig. 2, fig. 3 and fig. 5, wherein fig. 5 is a contracted state), and the height of the folding seat after being folded is lower than the height difference between two adjacent stand boards; the folding seat comprises a rectangular seat 27 (see fig. 12 and fig. 13, wherein fig. 13 is a folding state), the bottom surface of the rectangular seat is tightly attached to the stand plate, the rear side surface of the rectangular seat is tightly attached to the vertical plate, the bottom surface and the rear side surface of the rectangular seat are respectively provided with a buckle joint 28, the stand plate and the vertical plate are provided with a buckle groove corresponding to the buckle joint, the buckle groove on the vertical plate is L-shaped, the folding seat is fixed with the stand plate and the vertical plate through the buckle joint and the buckle groove, and the stand plate is also provided with an anti-disengagement mechanism of the folding seat; 11 rows of seats are arranged on the front and rear viewing stands, each row of seats is provided with 25 seats, the seats are divided into three areas, a passageway 38 is arranged between every two adjacent areas, and the number of the seats on the whole lifting telescopic viewing stand is 550; the rest is the same as in example 1.

Example 3

The two ends of the stand plate of the embodiment 3 are provided with fences 8 (see fig. 4, fig. 6 and fig. 9, wherein fig. 6 is a contracted state), the fences are fixedly inserted into the stand plate, and the upper ends of the fences are in an outward inclined structure; when the telescopic elevating/lowering stand is retracted, the fences on both sides of the upper stand plate are retracted into the fences on both sides of the lower stand plate, and the rest is the same as in embodiment 1 or embodiment 2.

Example 4

In embodiment 4 shown in fig. 10, the front stand and the rear stand have the same structure, and the height difference between the adjacent two stand plates on the front stand or the rear stand is the same; the front side of the front layer 29 (first layer) of the rear stand and the rear side of the rear layer 30 of the front stand are both provided with hinge lugs 31, the hinge lugs are provided with hinge shaft holes, when the rear stand is lifted to the support frame in a contraction state, the hinge lugs on the rear stand are hinged with the hinge lugs on the front stand through (inserted) hinge shafts 32; the front-view stand and the rear-view stand are pulled apart and extended towards one side far away from the support frame, the front-view stand and the rear-view stand are overlapped up and down in opposite directions to form a platform-shaped structure (see fig. 11), and the rest is the same as that of the embodiment 1.

In addition to the above embodiments, the technical features or technical data of the present invention can be selected and combined again within the scope disclosed in the claims and the specification of the present invention to constitute new embodiments, which can be realized by those skilled in the art without creative efforts, and therefore, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and within the protection scope of the present invention.

Claims (10)

1. A lifting telescopic stand is characterized by comprising a stand frame, a support frame (1) and a lifting frame (2), wherein the stand frame comprises a front stand frame (3) and a rear stand frame (4), the front stand frame and the rear stand frame are identical in structure, the front stand frame and the rear stand frame are of a telescopic structure formed by a plurality of layers of supports (5) which are arranged in a front-back stacking mode, the height of the rear support frame is larger than that of the front support frame, a stand plate (6) is arranged on each layer of support frame, the stand plates are lifted layer by layer from the front layer to the rear layer of the stand frame, the support frame is of a plurality of layers of telescopic structures which are arranged in a front-back stacking mode, the height of the support frame is equivalent to that of the last stand plate on the front stand frame, the lifting frame is located on the rear side of the support frame, a lifting motor (9) for driving the rear stand frame to lift is arranged on the lifting frame, and telescopic motors (33) used for driving the stand or the support frame to stretch and retract are arranged below the front layer stand board of the stand and the front layer lower part of the support frame.

2. The lifting telescopic stand according to claim 1, wherein a detachable folding seat (7) is arranged on the stand plate, the height of the folding seat after being folded is lower than the height difference between two adjacent stand plates, fences (8) are arranged at two ends of each stand plate, the fences are fixedly inserted into the stand plate, and the upper ends of the fences are outwards in an inclined structure; when the lifting telescopic stand is contracted, the fences at two sides of the stand plate on the upper layer are contracted in the fences at two sides of the stand plate on the lower layer.

3. The lifting telescopic grandstand according to claim 1, wherein the lifting frame is semi-enclosed in the retracted state from the rear side and both sides, the lifting motor is connected to winches (11) disposed at both sides through a transmission shaft (10), the wire ropes (12) on both winches are fixed to a cross frame (14) through pulley mechanisms (13), and the rear grandstand is placed on the cross frame.

4. The lifting telescopic stand as claimed in claim 3, wherein the lifting frame is provided with support feet at four corners, the support feet comprise cross arms (15) extending outwards at the four corners of the lifting frame, screw nuts (16) arranged on the cross arms and screw rods (17) in threaded connection with the screw nuts, the top ends of the screw rods are provided with hand wheels (18), and the bottom ends of the screw rods are provided with support discs (19).

5. The lifting telescopic stand according to claim 1, wherein the support comprises a plurality of sets of columns (20) which are arranged in pairs, the distance between two columns at the rear layer is larger than the distance between two columns at the front layer, the rear side of the stand plate is fixed on the upper parts of the columns, the top ends of the columns are higher than the stand plate, a vertical plate (21) is arranged on the front side surface of the column above the stand plate, the vertical plate and the stand plate respectively form a vertical surface and a horizontal surface of a ladder structure of the lifting telescopic stand, rollers (22) are arranged on the top surfaces of the columns, and when the lifting telescopic stand is unfolded, the bottom surface of the front side of the stand plate at the upper layer is erected on the rollers on the top surfaces of the columns at the lower layer.

6. The lifting telescopic stand as claimed in claim 5, wherein the uprights are L-shaped, cross bars (23) are fixed to the bottoms of the uprights, ground wheels (24) are arranged at the bottoms of the cross bars, the upright cross bars of the rear supports are slidably connected to the outer sides of the upright cross bars of the front supports, connecting rods (25) are transversely arranged at the lower parts of the same group of uprights, inclined supporting rods (26) are further arranged on the uprights, the lower ends of the inclined supporting rods are fixed to the end parts of the connecting rods, the upper ends of the inclined supporting rods are fixed to the rear sides of the stand plates, and the inclined supporting rods on the two uprights are symmetrically arranged.

7. The lifting telescopic grandstand as claimed in claim 5, wherein the foldable seat comprises a rectangular seat (27), the bottom surface of the rectangular seat is tightly attached to the grandstand plate, the rear side surface of the rectangular seat is tightly attached to the vertical plate, the bottom surface and the rear side surface of the rectangular seat are provided with fastening heads (28), fastening grooves corresponding to the fastening heads are formed in the grandstand plate and the vertical plate, the fastening grooves in the vertical plate are L-shaped, the foldable seat is fixed to the grandstand plate and the vertical plate through the fastening heads and the fastening grooves, and an anti-disengagement mechanism of the foldable seat is further arranged on the grandstand plate.

8. The elevating telescopic stand as set forth in claim 1, wherein the height difference between the adjacent two stands of the front stand or the rear stand is the same; the front side of the front layer (29) of the rear stand and the rear side of the rear layer (30) of the front stand are both provided with hinge lugs (31), the hinge lugs are provided with hinge shaft holes, and when the rear stand is lifted to the support frame in a contraction state, the hinge lugs on the rear stand are hinged with the hinge lugs on the front stand through hinge shafts (32); the front stand and the rear stand are pulled open and extended towards one side far away from the support frame, and the front stand and the rear stand are overlapped up and down in the opposite direction to form a platform-shaped structure.

9. The lifting telescopic stand as claimed in claim 1, wherein the number of the layers of the supporting frame is the same as that of the rear stand, each layer of the supporting frame is of an equal-height structure, the top structure of the supporting frame is matched with the bottom structure of the rear stand, the top of the supporting frame is provided with a positioning groove for fixing the bottom of the rear stand, and the bottom of the supporting frame is provided with a land wheel.

10. The lifting telescopic stand according to any one of claims 1 to 8, wherein the telescopic motor is disposed between two columns in the same group, the telescopic motor drives the roller through a chain, and the roller is provided with a traction rope; a speed reducer (34) is arranged between the lifting motor and the transmission shaft, the rear end of the lifting motor is connected with a manual wheel (35), the transmission shaft is also connected with a cam switch (36) and an encoder (37) which are used for controlling the speed reduction and stop of the lifting motor, and the bottoms of the lifting frame and the stand are provided with fixing plates which can be fixed with the ground.

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