Ultra short lift

Abstract

The present invention relates to the technical field of display screen lifting equipment, and specifically discloses an ultra-short lift, comprising a frame, the frame comprising side panels and an opening, a flip cover plate movably provided at the opening of the frame, a lifting platform is provided in the frame, a linkage component is provided between the flip cover plate and the lifting platform, and is characterized in that the linkage component comprises a rotating arm, the rotating arm comprises a hinged end and a sliding end, a hollow track is provided on the side panel, the rotating arm is connected with a pull rope for driving the sliding end to slide reciprocally along the hollow track, the pull rope is provided with an inclined section arranged along the lifting direction of the lifting platform, a top block is fixedly sleeved on the inclined section, a synchronous pressing plate is provided on the lifting platform for pressing down the top block so that the pull rope slides synchronously with the movement of the lifting platform, the end of the inclined section is wound around the rotating arm and is connected with a reset elastic member for pulling the pull rope to slide in the opposite direction, the linkage component of the present invention has a simple structure and is easy to process, and adopts a flexible transmission structure, so that the linkage component operates more smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen lifting equipment, and in particular to an ultra-short lifter. Background Art

[0002] The Chinese invention patent "Ultra-short flip-down fusion all-in-one machine" (publication number: CN108903264A) discloses an ultra-short flip-down fusion all-in-one machine, including a cavity for accommodating a liquid crystal screen and a liquid crystal screen. A lifting mechanism for driving the liquid crystal screen to lift obliquely is installed in the cavity, and a flip mechanism for adjusting its angle is connected to the liquid crystal screen; an opening is provided on the upper surface of the cavity for the liquid crystal screen to extend out of the cavity after rising from the cavity, and a flap is installed at the opening, and the two ends of the flap are respectively connected to the lifting mechanism through a connecting rod mechanism. When the lifting mechanism is opened and raised, the flap flips down to open the opening, and after the lifting mechanism is lowered and closed, the flap flips up to close the opening. Although the invention application is provided with a linkage setting between the flap and the lifting mechanism to realize that the flap is opened in time when the liquid crystal screen rises and automatically closed after the liquid crystal screen falls, its linkage setting adopts a connecting rod mechanism, that is, multiple connecting rods are required to cooperate with each other, the structure is complex, the precision requirement is high, the processing cost is high, and the flipping of the flap is not smooth enough. Summary of the invention

[0003] The object of the present invention is to provide an ultra-short lifter in view of the existing technical status, wherein the linkage arrangement between the flap plate and the lifting mechanism is simple in structure and the flap plate can be turned over smoothly.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] The lifting platform is provided with a synchronous pressing plate for pressing down the top stop block so that the pull rope slides synchronously with the movement of the lifting platform, and the end of the inclined section is connected with the rotating arm and is connected with a reset elastic member for pulling the pull rope to slide in the opposite direction.

[0006] As a preferred specific embodiment of the present invention, the flip plate is hinged between the two side plates, and a sliding groove extending along the width direction of the flip plate is provided on the back of the flip plate, and the rotating arm includes a rotating rod and a driving pin that are perpendicular to each other, and the end of the rotating rod away from the driving pin is connected to the side plate through a rotating connecting piece, the driving pin is located on the sliding end of the rotating arm, and the driving pin slides in the hollow track and the sliding groove at the same time.

[0007] As a preferred specific embodiment of the present invention, the lifting platform is connected to a lifting assembly for driving the lifting platform to perform oblique lifting and lowering, the lifting assembly includes a conveyor belt arranged along the inclined direction and a lifting motor for driving the conveyor belt to rotate, the lifting platform is provided with an engaging pressure block and a bottom plate for cooperating with the engaging pressure block to clamp the conveyor belt, the conveyor belt is clamped between the engaging pressure block and the bottom plate, and the inner surface of the engaging pressure block is engaged with the conveyor belt.

[0008] As a preferred specific embodiment of the present invention, a steering member for steering the pull rope is provided on the side panel, and the steering member includes a head steering wheel group and a tail steering wheel group for winding the two ends of the inclined section to the bottom of the conveyor belt, and the head steering wheel group and the tail steering wheel group are respectively arranged on the head and tail sides of the conveyor belt, and the head steering wheel group includes a connecting wheel arranged on the rotating rod, and one end of the inclined section close to the head steering wheel group bypasses the head steering wheel group and is connected to the reset elastic member, and one end of the reset elastic member away from the pull rope is fixed to the side panel, and one end of the inclined section close to the tail steering wheel group bypasses the tail steering wheel group and is connected to an auxiliary elastic member, and one end of the auxiliary elastic member away from the pull rope is fixed to the side panel, and the rebound directions between the reset elastic member and the auxiliary elastic member are set in opposite directions.

[0009] As a preferred specific implementation of the present invention, a guide rail is provided on the inner side of the side panel, the guide rail is arranged along the lifting direction of the lifting platform, and the lifting platform is provided with a sliding seat sliding on the guide rail.

[0010] As a preferred specific embodiment of the present invention, the display screen is rotatably arranged on a lifting platform, and an angle adjustment mechanism for adjusting the inclination angle of the display screen is provided between the lifting platform and the display screen. The angle adjustment mechanism includes a fixed frame, a screen rotating shaft and a driving shaft for driving the screen rotating shaft to rotate. The screen rotating shaft and the driving shaft are rotatably arranged on the fixed frame, and a driven fixed wheel and an active fixed wheel are respectively mounted on the screen rotating shaft and the driving shaft. A first connecting rod and a second connecting rod parallel to each other are connected between the driven fixed wheel and the active fixed wheel, and two ends of the first connecting rod and the second connecting rod are respectively hinged on the driven fixed wheel and the active fixed wheel, and the driving shaft is connected to a driving component for driving the driving shaft to rotate.

[0011] As a preferred specific embodiment of the present invention, the angle adjustment mechanism is also provided with a detection component for detecting the current tilt state of the display screen, the detection component includes a first photoelectric sensor and a second photoelectric sensor, the first photoelectric sensor and the second photoelectric sensor are respectively provided with a first baffle plate and a second baffle plate for blocking their light signals, the first baffle plate and the second baffle plate are annular plates with notches, and are concentrically arranged with the driving shaft, and the notches of the first baffle plate and the second baffle plate do not completely overlap; based on the direction in which the lifting platform is lifted, the tilt state includes a forward tilt state, a backward tilt state and a parallel state, when the display screen is in a parallel state, the light signals of the first photoelectric sensor and the second photoelectric sensor are blocked at the same time, when the display screen is in a forward tilt state, only the light signal of the first photoelectric sensor is blocked, and when the display screen is in a backward tilt state, only the light signal of the second photoelectric sensor is blocked.

[0012] As a preferred specific implementation of the present invention, the top support block is a rubber column and a steel core arranged concentrically, the steel core is fixedly connected to the steel wire rope, and the rubber column is tightly sleeved outside the steel core.

[0013] The beneficial effects of the present invention are:

[0014] 1) The linkage assembly of the present invention realizes the coordinated opening of the flip cover when the display screen rises and the coordinated closing of the display screen after it descends through the mutual cooperation between the pull rope, the top block, and the synchronous pressure plate arranged on the lifting platform. It has a simple structure and is easy to process. It adopts a flexible transmission structure, the linkage assembly operates more smoothly, and the buffering performance is better.

[0015] 2) The present invention adopts a structural setting in which the driving pin slides on the hollow track and the sliding groove at the same time, which greatly reduces the curvature of the hollow track, makes the hollow track flatter, and makes the sliding of the driving pin smoother and more labor-saving, and the flipping of the flip cover is smoother and more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of the present invention.

[0017] Figure 2 It is a stereogram of the present invention.

[0018] Figure 3 for Figure 2 A partial enlarged view of area A.

[0019] Figure 4 It is a schematic diagram of the structure of the display screen in a parallel state.

[0020] Figure 5 It is a structural schematic diagram of the angle adjustment mechanism. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0022] Example 1

[0023] See also Figure 1-Figure 4 As shown, the present invention discloses an ultra-short lift, including a frame 1, the frame 1 including side panels 11 arranged on both sides and an opening 12 arranged on the top, the display screen 3 is exposed outside the frame 1 through the opening 12, a flip cover plate 2 is movably provided at the opening 12 of the frame 1, a lifting platform 4 for driving the display screen 3 to be obliquely lifted and lowered inside and outside the frame 1 is provided in the frame 1, a linkage component 5 is provided between the flip cover plate 2 and the lifting platform 4, the linkage component 5 includes a rotating arm 51, the rotating arm 51 includes a hinged end for rotatably connecting with the side panel 11 and a sliding end for driving the flip cover plate 2 to flip, a hollow track 13 for guiding and limiting the sliding end is opened on the side panel 11, and the rotating arm 51 is connected with a hinge for driving the sliding end to slide back and forth along the hollow track 13 The pull rope 52, in this embodiment, the pull rope 52 is a steel wire rope, and the pull rope 52 is provided with an inclined section arranged along the lifting direction of the lifting platform 4, and the inclined section is fixedly sleeved with a top stop block 53, and the "fixed sleeve" here means that the top stop block 53 and the pull rope 52 do not slide relative to each other, and the lifting platform 4 is provided with a synchronous pressure plate 54 for pressing down the top stop block 53 so that the pull rope 52 slides synchronously with the movement of the lifting platform 4, and the synchronous pressure plate 54 is provided with a through hole for the pull rope 52 to pass through, and the end of the inclined section is wound around the rotating arm 51 and is connected to a reset elastic member 55 for pulling the pull rope 52 to slide in the opposite direction, and the "reverse direction" here is the opposite direction of the synchronous pressure plate 54 acting on the pull rope 52, and in this embodiment, the reset elastic member 55 is a strip spring member.

[0024] by Figure 1 For reference, the operating principle of the present invention is as follows:

[0025] When the display screen 3 is stored in the frame 1, the lifting platform 4 is located at the lower left of the frame 1, the top block 53 on the pull rope 52 is pressed by the synchronous pressure plate 54, the pull rope 52 is fixed, and the pull rope 52 tightens the rotating arm 51 to fix it to one end of the hollow track 13. At this time, the flip cover plate 2 remains in a horizontal state and covers the opening 12. The reset elastic member 55 is in a stretched state. When the lifting platform 4 rises along the upper right, the synchronous pressure plate 54 rises with the lifting platform 4, the top block 53 gradually breaks away from the pressure of the synchronous pressure plate 54, the reset elastic member 55 contracts, thereby pulling the pull rope 52 to rotate clockwise, and the sliding end of the rotating arm 51 slides from one end of the hollow track 13 to the other end, driving the flip cover plate 2 to flip from a horizontal state to a vertical state, thereby opening the opening 12 before the display screen 3 reaches the opening 12.

[0026] When the display screen 3 is to be stored in the frame 1 after use, the lifting platform 4 descends, and the synchronous pressure plate 54 descends accordingly, until the synchronous pressure plate 54 abuts against the top block 53, and the synchronous pressure plate 54 presses down the top block 53, and the top block 53 moves to the side away from the opening 12, driving the pull rope 52 to slide accordingly, driving the rotating arm 51 to rotate around the hinged end as the axis, pulling the sliding end of the rotating arm 51 to slide along the hollow track 13, and the linked flip cover plate 2 is flipped from the vertical state to the opening 12, thereby blocking the opening 12.

[0027] The linkage assembly 5 of the present invention realizes the coordinated opening of the flip cover plate 2 when the display screen 3 rises and the coordinated closing of the display screen 3 after it descends through the mutual cooperation among the pull rope 52, the top block 53, and the synchronous pressure plate 54 arranged on the lifting platform 4. It has a simple structure and is easy to process. It adopts a flexible transmission structure, and the linkage assembly 5 runs more smoothly and has better buffering performance.

[0028] In this embodiment, the top block 53 is a rubber column and a steel core arranged concentrically, which is fixed to the steel wire rope through the steel core, and the rubber column is tightly sleeved on the outside of the steel core, which is beneficial to the tight connection between the top block 53 and the steel wire rope, and also helps to improve the fit tightness when the top block 53 and the synchronous pressure plate 54 are in contact.

[0029] As a preferred specific embodiment of the present invention, the flip plate 2 is provided with an axis hole 21 and is hinged between the two side plates 11 through a rotating axis, and a sliding groove 22 extending along the width direction of the flip plate 2 is provided on the back of the flip plate 2, and the rotating arm 51 includes a rotating rod 512 and a driving pin 513 that are perpendicular to each other, and the end of the rotating rod 512 away from the driving pin 513 is connected to the side plate 11 through the axis pin 511, and the driving pin 513 is located on the sliding end of the rotating arm 51, and the driving pin 513 slides in the hollow track 13 and the sliding groove 22 at the same time.

[0030] During use, the pull rope 52 slides under the pull of the synchronous pressure plate 54 or the reset elastic member 55, driving the rotating rod 512 to rotate around the axle pin 511, and the driving pin 513 slides along the hollow track 13. At the same time, the driving pin 513 abuts against the inner wall of the sliding groove 22, driving the flip cover plate 2 to rotate around the rotating axis.

[0031] The present invention adopts a structural setting in which the driving pin 513 slides on the hollow track 13 and the sliding groove 22 at the same time, which greatly reduces the curvature of the hollow track 13, the hollow track 13 tends to be flat, the sliding of the driving pin 513 is smoother and more labor-saving, and the flipping of the flip cover plate 2 is smoother and more labor-saving.

[0032] As a preferred specific embodiment of the present invention, the lifting platform 4 is connected to a lifting component 6 for driving the lifting platform 4 to perform oblique lifting and lowering. The lifting component 6 includes a conveyor belt 61 arranged along the inclined direction and a lifting motor 62 for driving the conveyor belt 61 to rotate. The lifting motor 62 is connected to the conveyor belt 61 through a synchronous wheel. The lifting platform 4 is provided with an engaging pressure block 63 and a bottom plate 64 for cooperating with the engaging pressure block 63 to clamp the conveyor belt 61. The engaging pressure block 63 and the bottom plate 64 are fixed by screws. The conveyor belt 61 is clamped between the engaging pressure block 63 and the bottom plate 64. The inner surface of the engaging pressure block 63 is engaged with the conveyor belt 61. During use, as the conveyor belt 61 is transported, the engaging pressure block 63 moves with the conveyor belt 61, thereby driving the lifting platform 4 to lift and lower.

[0033] A guide rail is provided on the inner side of the side panel 11, and the guide rail is arranged along the lifting direction of the lifting platform 4. The lifting platform 4 is provided with a sliding seat sliding on the guide rail. The sliding seat is a C-shaped structure with an opening 12 facing the guide rail. The lifting platform 4 slides on the guide rail through the sliding seat, and the guiding effect of the guide rail makes the lifting of the lifting platform 4 smoother.

[0034] As a preferred specific embodiment of the present invention, a steering member 7 for steering the pull rope 52 is provided on the side plate 11, and the steering member 7 includes a head steering wheel group 71 and a tail steering wheel group 72 for winding the two ends of the inclined section under the conveyor belt 61. The head steering wheel group 71 and the tail steering wheel group 72 are respectively arranged at the head and tail sides of the conveyor belt 61. The head steering wheel group 71 and the tail steering wheel group 72 are both composed of a plurality of guide wheels. The head steering wheel group 71 includes a connecting wheel 711 arranged on the rotating rod 512. One end of the inclined section close to the head steering wheel group 71 bypasses the head steering wheel group 71 and is connected to the reset elastic member 55. One end of the reset elastic member 55 away from the pull rope 52 is fixed to the side plate 11. One end of the inclined section close to the tail steering wheel group 72 bypasses the tail steering wheel group 72 and is connected to the auxiliary elastic member 8. In this embodiment, the auxiliary elastic member 8 is a strip spring member. One end of the auxiliary elastic member 8 away from the pull rope 52 is fixed to the side plate 11, and the rebound directions between the reset elastic member 55 and the auxiliary elastic member 8 are set in opposite directions.

[0035] Example 2

[0036] The difference between this embodiment and the embodiment 1 is that the display screen 3 can be rotatably arranged on the lifting platform 4, and an angle adjustment mechanism 9 for adjusting the tilt angle of the display screen 3 is also provided between the lifting platform 4 and the display screen 3. Figures 4 to 5As shown, the angle adjustment mechanism 9 includes a fixed frame 91, a screen rotating shaft 92 and a driving shaft 93 for driving the screen rotating shaft 92 to rotate. The screen rotating shaft 92 is fixedly connected to the display screen 3. The screen rotating shaft 92 and the driving shaft 93 are rotatably arranged on the fixed frame 91 through a bearing sleeve. A driven fixed wheel 94 and an active fixed wheel 95 are respectively sleeved on the screen rotating shaft 92 and the driving shaft 93. There is no relative rotation between the driven fixed wheel 94 and the screen rotating shaft 92, and there is no relative rotation between the active fixed wheel 95 and the driving shaft 93. For example, they can be fixed to each other by screws. A first connecting rod 96 and a second connecting rod 97 parallel to each other are connected between the driven fixed wheel 94 and the active fixed wheel 95. A first hinge hole and a second hinge hole for being hinged to the first connecting rod 96 and the second connecting rod 97 are provided on the annular surface of the driven fixed wheel 94, and a second hinge hole for being hinged to the first connecting rod 96 and the second connecting rod 97 are provided on the annular surface of the active fixed wheel 95. The third hinge hole and the fourth hinge hole are hinged to each other, and the two ends of the first link 96 and the second link 97 are hinged to the driven fixed wheel 94 and the active fixed wheel 95 respectively. The axis of the first hinge hole and the second hinge hole, the axis of the third hinge hole and the fourth hinge hole, the first link 96 and the second link 97 form a parallelogram transmission structure. The driving shaft 93 is connected with a driving component 98 for driving the driving shaft 93 to rotate. In this embodiment, the driving component 98 includes a reduction motor. The driving shaft 93 rotates under the drive of the reduction motor, driving the axis of the third hinge hole and the fourth hinge hole to rotate, and then driving the axis of the first hinge hole and the second hinge hole to rotate through the linkage of the first link 96 and the second link 97, and the screen shaft 92 rotates accordingly. The display screen 3 rotates with the screen shaft 92 as the axis to adjust the inclination angle of the display screen 3.

[0037] To improve the stability of the parallelogram transmission structure, two driven fixed wheels 94 and two active fixed wheels 95 may be provided, and the first connecting rod 96 and the second connecting rod 97 are sandwiched between the two driven fixed wheels 94 and the two active fixed wheels 95 .

[0038] The angle adjustment mechanism 9 is further provided with a detection component 99 for detecting the current tilt state of the display screen 3. The detection component 99 includes a first photoelectric sensor 991 and a second photoelectric sensor 992. The first photoelectric sensor 991 and the second photoelectric sensor 992 are respectively provided with a first shielding plate 993 and a second shielding plate 994 for shielding their light signals. The first shielding plate 993 and the second shielding plate 994 are annular plates with a notch 995 and are concentrically arranged with the drive shaft 93. In this embodiment, the first shielding plate 993 and the second shielding plate 994 are sleeved on the drive shaft 93 or the damping shaft. The fixing ring is fixed, and the gap 995 of the first baffle plate 993 and the second baffle plate 994 does not completely overlap to ensure that only one photoelectric sensor is blocked. Taking the direction in which the lifting platform 4 is lifted and lowered as a reference, the tilt state includes a forward tilt state, a backward tilt state and a parallel state. When the display screen 3 is in a parallel state, the light signals of the first photoelectric sensor 991 and the second photoelectric sensor 992 are blocked at the same time. When the display screen 3 is in a forward tilt state, only the light signal of the first photoelectric sensor 991 is blocked. When the display screen 3 is in a backward tilt state, only the light signal of the second photoelectric sensor 992 is blocked.

[0039] Specifically, when the display screen 3 is in a parallel state (i.e., the display screen 3 is arranged parallel to the lifting direction of the lifting platform 4), the light signals of the first photoelectric sensor 991 and the second photoelectric sensor 992 are blocked at the same time. When the display screen 3 is in a forward tilted state (i.e., the angle a between the display screen 3 and the horizontal plane is smaller than the angle b between the lifting direction of the lifting platform 4 and the horizontal plane), the first photoelectric sensor 991 is blocked by the annular surface of the first shielding plate 993, and the notch 995 of the second shielding plate 994 just rotates to the second photoelectric sensor 992, and the light signal of the second photoelectric sensor 992 is not blocked, that is, only the light signal of the first photoelectric sensor 991 is blocked. When the display screen 3 is in a backward tilted state (i.e., the display screen 3 and the horizontal plane are tilted), the first photoelectric sensor 991 is blocked by the annular surface of the first shielding plate 993, and the notch 995 of the second shielding plate 994 just rotates to the second photoelectric sensor 992. The angle a between the horizontal planes is greater than the angle b between the lifting direction of the lifting platform 4 and the horizontal plane, only the light signal of the second photoelectric sensor 992 is blocked, and the control program determines the current tilt state of the display screen 3 by whether the light signals of the first photoelectric sensor 991 and the second photoelectric sensor 992 are blocked. As a specific implementation of the present invention, before the display screen 3 is put into the frame 1, the control program first determines the current tilt state of the display screen 3. If the display screen 3 is not in a parallel state, the display screen 3 is adjusted to a parallel state by controlling the rotation of the drive shaft 93 (that is, the drive shaft 93 is rotated until the light signals of the first photoelectric sensor 991 and the second photoelectric sensor 992 are blocked at the same time).

[0040] The present invention can determine whether the display screen 3 is in a parallel state before storage by using the detection component 99, and reset the display screen 3 to a parallel state according to the judgment result, without the need for manual angle adjustment. At the same time, it can effectively prevent the display screen 3 from colliding with the opening 12 during the storage process, making the storage of the display screen 3 more convenient, smoother and safer.

[0041] In this article, "first", "second", "third", "fourth", etc. are only used to distinguish each other, and do not indicate their importance and order, or the premise of each other's existence.

[0042] Finally, it should be noted that the principles and implementation methods of the present invention are described in detail in the text using specific examples, and the description of the above embodiments is only used to help the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An ultra-short lift, comprising a frame, the frame comprising side panels arranged on both sides and an opening arranged on the top, a flip cover plate movably arranged at the frame opening, a lifting platform for driving the display screen to be lifted obliquely inside and outside the frame, a linkage component is arranged between the flip cover plate and the lifting platform, characterized in that: The linkage assembly includes a rotating arm, the rotating arm includes a hinged end for rotatably connecting with the side plate and a sliding end for driving the flip cover plate to flip, the side plate is provided with a hollow track for guiding and limiting the sliding end, the rotating arm is connected with a pull rope for driving the sliding end to slide back and forth along the hollow track, the pull rope is provided with an inclined section arranged along the lifting direction of the lifting platform, the inclined section is fixedly sleeved with a top block, the lifting platform is provided with a synchronous pressing plate for pressing down the top block so that the pull rope slides synchronously with the movement of the lifting platform, the end of the inclined section is wound around the rotating arm and connected with a reset elastic member for pulling the pull rope to slide in the opposite direction; The flip cover plate is hinged between the two side plates, and a sliding groove extending along the width direction of the flip cover plate is provided on the back of the flip cover plate. The rotating arm includes a rotating rod and a driving pin which are perpendicular to each other. The end of the rotating rod away from the driving pin is connected to the side plate through a rotating connecting piece. The driving pin is located on the sliding end of the rotating arm, and the driving pin slides in the hollow track and the sliding groove at the same time. The lifting platform is connected with a lifting assembly for driving the lifting platform to lift obliquely, the lifting assembly includes a conveyor belt arranged along the inclined direction and a lifting motor for driving the conveyor belt to rotate, the lifting platform is provided with an engaging pressure block and a bottom plate for cooperating with the engaging pressure block to clamp the conveyor belt, the conveyor belt is clamped between the engaging pressure block and the bottom plate, and the inner surface of the engaging pressure block is engaged with the conveyor belt; The side plate is provided with a steering member for steering the pull rope, and the steering member includes a head steering wheel group and a tail steering wheel group for winding the two ends of the inclined section to the bottom of the conveyor belt, and the head steering wheel group and the tail steering wheel group are respectively arranged at the head and tail sides of the conveyor belt, and the head steering wheel group includes a connecting wheel arranged on the rotating rod, and the end of the inclined section close to the head steering wheel group bypasses the head steering wheel group and is connected to the reset elastic member, and the end of the reset elastic member away from the pull rope is fixed to the side plate, and the end of the inclined section close to the tail steering wheel group bypasses the tail steering wheel group and is connected to the auxiliary elastic member, and the end of the auxiliary elastic member away from the pull rope is fixed to the side plate, and the rebound directions between the reset elastic member and the auxiliary elastic member are arranged in opposite directions; The inner side of the side plate is provided with a guide rail, the guide rail is arranged along the lifting direction of the lifting platform, and the lifting platform is provided with a sliding seat sliding on the guide rail; The display screen is rotatably arranged on the lifting platform, and an angle adjustment mechanism for adjusting the inclination angle of the display screen is arranged between the lifting platform and the display screen. The angle adjustment mechanism includes a fixed frame, a screen rotating shaft and a driving shaft for driving the screen rotating shaft to rotate. The screen rotating shaft and the driving shaft are rotatably arranged on the fixed frame, and a driven fixed wheel and an active fixed wheel are respectively sleeved on the screen rotating shaft and the driving shaft. A first connecting rod and a second connecting rod parallel to each other are connected between the driven fixed wheel and the active fixed wheel, and two ends of the first connecting rod and the second connecting rod are respectively hinged on the driven fixed wheel and the active fixed wheel, and the driving shaft is connected to a driving component for driving the driving shaft to rotate.

2. The ultra-short lifter according to claim 1, characterized in that: The angle adjustment mechanism is also provided with a detection component for detecting the current tilt state of the display screen, the detection component includes a first photoelectric sensor and a second photoelectric sensor, the first photoelectric sensor and the second photoelectric sensor are respectively provided with a first baffle plate and a second baffle plate for shielding their light signals, the first baffle plate and the second baffle plate are annular plates with notches, and are concentrically arranged with the driving shaft, and the notches of the first baffle plate and the second baffle plate do not completely overlap; based on the direction in which the lifting platform is lifted, the tilt state includes a forward tilt state, a backward tilt state and a parallel state, when the display screen is in a parallel state, the light signals of the first photoelectric sensor and the second photoelectric sensor are blocked at the same time, when the display screen is in a forward tilt state, only the light signal of the first photoelectric sensor is blocked, and when the display screen is in a backward tilt state, only the light signal of the second photoelectric sensor is blocked.

3. The ultra-short lifter according to claim 1, characterized in that: The top support block is a rubber column and a steel core which are arranged concentrically. The steel core is fixedly connected with the steel wire rope, and the rubber column is tightly sleeved outside the steel core.

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