CN219326549U - Lifting device - Google Patents

Abstract

The utility model relates to a lifting device which comprises a base, a lifting mechanism, a supporting platform and a limiting mechanism. The supporting platform is driven to lift by the lifting mechanism, so that the automobile is lifted, and maintenance personnel can maintain the automobile conveniently. When the first driving block is abutted to the upper end face of the first end of the rotating piece, the first limiting piece is abutted to the upper end face of the second end of the rotating piece, and the second end is limited to deflect upwards by the first limiting piece. When the supporting platform has a falling trend, the first driving block can apply downward force to the first end of the rotating piece, so that the first end has a downward deflection trend, and correspondingly, the second end has an upward deflection trend. Because the restriction of first locating part, the second end can't upwards deflect, and first drive block can not make the first end of rotating the piece deflect downwards promptly, and promptly, supporting platform can keep in current high position, has better position locking function to prevent that the unexpected whereabouts of car from influencing the condition emergence of maintenance personal's personal safety.

Description

Lifting device

Technical Field

The utility model relates to the technical field of automobiles, in particular to a lifting device.

Background

The lifting device plays a very important role in automobile maintenance. The automobile lifting device is equipment for lifting an automobile in the automobile maintenance process, the automobile is driven to a supporting station of the lifting device, the automobile can be lifted to a certain height through manual operation, and the automobile maintenance is facilitated.

In the related art, the lifting device has poor position locking function, so that an automobile is easy to fall from the current supporting height, the automobile is damaged if the automobile is light, and the body of a maintainer is damaged if the automobile is heavy.

Disclosure of Invention

Based on this, it is necessary to provide a lifting device that solves the problem of the existing lifting device that has a poor height locking function.

A lifting device, comprising:

a base;

the lifting mechanism is connected to the base; the lifting mechanism comprises a first driving piece and a first driving block connected with the first driving piece; the first driving piece is used for driving the first driving block to lift along the vertical direction;

the support platform is connected to the first driving block;

the limiting mechanism comprises a first limiting piece, a rotating piece and a first rotating shaft connected to the base; the first limiting piece is connected to the base; the rotating piece can rotate around a first rotating shaft relative to the base; the first end of the rotating piece is used for abutting against the lower end face of the first driving block; the second end of the rotating piece is used for abutting against the lower end face of the first limiting piece so that the first limiting piece limits the second end to deflect upwards; the first end and the second end are respectively positioned at two sides of the first rotating shaft.

In one embodiment, the limiting mechanism further comprises a second limiting member connected to the base; the second limiting piece is positioned below the rotating piece;

when the rotating piece rotates to be abutted against the second limiting piece, the second limiting piece limits the deflection of the rotating piece.

In one embodiment, a first elastic member is connected between the second end and the second limiting member, and the first elastic member is used for driving the rotating member to rotate until the second end abuts against the first limiting member when external force is removed.

In one embodiment, the number of the limiting mechanisms is multiple, and the multiple groups of limiting mechanisms are distributed at intervals along the vertical direction.

In one embodiment, the lifting device further comprises a second driving rod and a second driving block connected with the second driving rod in a threaded mode, and the second driving block is connected with the base in a sliding mode; the first limiting piece is connected to the second driving block;

the second driving rod is configured to rotate in an operable mode to drive the second driving block to move along the vertical direction, and the first limiting piece is driven by the second driving block to move.

In one embodiment, the lifting device further comprises a driving wheel, a driven wheel and a driving belt, wherein the driving belt is connected with the driving wheel and the driven wheel in a tensioning manner;

the driving wheel is rotatably connected to the base, and the second driving rod is connected to the driven wheel and is driven by the driven wheel to rotate.

In one embodiment, the lifting device further comprises an adjusting mechanism, wherein the adjusting mechanism comprises a fixed piece and a moving piece, and the fixed piece is connected to the first driving block; the moving piece is connected with the fixed piece in a sliding way along the horizontal direction; the support platform is connected to the moving member.

In one embodiment, the moving member is configured with a rotating groove, and the support platform is capable of rotating a groove wall connected to the rotating groove with the vertical direction as an axis.

In one embodiment, the support platform is provided with a buffer; and/or

And a pressure detector is arranged on the supporting platform.

In one embodiment, the first driver comprises a first drive rod; the first driving block is connected with the first driving rod in a threaded manner and is connected with the base in a sliding manner;

the first driving rod is configured to be operably rotated to drive the first driving block to lift in the vertical direction.

The lifting device comprises a base, a lifting mechanism, a supporting platform and a limiting mechanism. The lifting mechanism comprises a first driving piece and a first driving block, and the supporting platform is connected to the first driving block. The first driving piece is used for driving the first driving block to lift, so that the supporting platform is driven to lift, the supporting platform is adjusted to a proper height, the automobile is lifted, and maintenance personnel are convenient to maintain. The limiting mechanism comprises a first limiting piece and a rotating piece. When the first driving block is abutted to the upper end face of the first end of the rotating piece, the first limiting piece is abutted to the upper end face of the second end of the rotating piece, and the second end is limited to deflect upwards by the first limiting piece. That is, when an accident occurs such that the support platform has a tendency to fall, the first driving block applies a downward force to the first end of the rotating member such that the first end has a tendency to deflect downward, and correspondingly, the second end has a tendency to deflect upward. And because the restriction of first locating part for the second end can't upwards deflect, first drive block can not make the first end of rotating the piece deflect downwards promptly, and promptly, supporting platform can keep in current high position, has better position locking function, thereby prevents that the unexpected whereabouts of car from influencing the condition emergence of maintenance personal's personal safety.

Drawings

Fig. 1 is a schematic structural diagram of a lifting device according to an embodiment of the utility model at a first view angle;

FIG. 2 is a schematic view in semi-section of the lifting device shown in FIG. 1;

FIG. 3 is an enlarged view of the lifting device shown in FIG. 2 at A;

FIG. 4 is a schematic view of a support platform in the lifting device shown in FIG. 2;

FIG. 5 is a schematic view of the lifting device shown in FIG. 1 at a second view angle;

fig. 6 is an enlarged view of the lifting device shown in fig. 5 at B.

Reference numerals: 100-lifting device; 110-a base; 111-a chute; 120-lifting mechanism; 121-a first driving member; 1211-a first drive rod; 1212-a drive motor; 122-a first drive block; 130-a support platform; 131-a buffer; 132-a pressure detector; 140-a limiting mechanism; 141-a first limiting piece; 142-rotating member; 143-a first spindle; 144-a second limiting piece; 145-a first elastic member; 151-a second drive rod; 152-a second drive block; 153-connection plate; 154-driven wheel; 155-a drive belt; 156-rotating disc; 157-a support frame; 158-a second elastic member; 160-an adjustment mechanism; 161-fixing piece; 162-moving member; 1621-rotating groove.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

FIG. 1 is a schematic view of a lifting device according to an embodiment of the present utility model at a first view angle, and FIG. 2 is a schematic view of the lifting device shown in FIG. 1 in a semi-section; fig. 3 is an enlarged view at a in the lifting device shown in fig. 2.

As shown in fig. 1 to 3, a lifting device 100 according to an embodiment of the present utility model includes a base 110, a lifting mechanism 120, a supporting platform 130, and a limiting mechanism 140. The lifting mechanism 120 is connected to the base 110; the lifting mechanism 120 includes a first driving member 121 and a first driving block 122 connected to the first driving member 121; the first driving member 121 is used to drive the first driving block 122 to lift in the vertical direction. The support platform 130 is connected to the first drive block 122. The limiting mechanism 140 includes a first limiting member 141, a rotating member 142, and a first rotating shaft 143 connected to the base 110; the first limiting member 141 is connected to the base 110; the rotating member 142 can rotate relative to the base 110 about the first rotation axis 143; the first end of the rotating member 142 is used for abutting against the lower end surface of the first driving block 122; the second end of the rotating member 142 is used for abutting against the lower end surface of the first limiting member 141, so that the first limiting member 141 limits the second end from deflecting upwards; the first end and the second end are located at both sides of the first rotation shaft 143, respectively.

The vertical direction is shown by the Z direction, and the Z direction can be directed by O to Z or Z to O. It will be appreciated that the vertical direction, i.e. the direction of gravity, is perpendicular to the horizontal plane. When the support platform 130 is driven to ascend, the vertical direction points to the OZ direction; when the support platform 130 is driven to descend, the vertical direction is directed in the ZO direction.

The first driving piece 121 drives the first driving block 122 to lift, so that the supporting platform 130 is driven to lift, the supporting platform 130 is adjusted to a proper height, the automobile is lifted, and maintenance personnel can maintain the automobile conveniently. When the first driving block 122 abuts against the upper end surface of the first end of the rotating member 142, the first limiting member 141 abuts against the upper end surface of the second end of the rotating member 142, and the first limiting member 141 limits the second end to deflect upwards, for example, in the view of fig. 3, the first limiting member 141 limits the rotating member 142 to deflect clockwise. That is, when an accident occurs such that the support platform 130 has a tendency to fall, the first driving block 122 applies a downward force to the first end of the rotating member 142 such that the first end has a tendency to deflect downward, and correspondingly, the second end has a tendency to deflect upward. Due to the limitation of the first limiting member 141, the second end cannot deflect upwards, that is, the first end of the rotating member 142 cannot deflect downwards by the first driving block 122, that is, the supporting platform 130 can be kept at the current height position, and the second end has a better position locking function, so that the situation that the personal safety of a maintainer is influenced by accidental falling of an automobile is prevented.

As shown in fig. 2 and 3, in one embodiment, the first driver 121 includes a first driver rod 1211; the first driving block 122 is screwed to the first driving rod 1211 and is slidably connected to the base 110; the first driving rod 1211 is configured to be operatively rotated to raise and lower the first driving block 122 in the vertical direction (Z direction). The first driving rod 1211 is connected with a driving motor 1212, and the driving motor 1212 drives the first driving rod 1211 to rotate, so that the first driving block 122 drives the supporting platform 130 to lift and lower, thereby moving to a proper height. The base 110 is provided with a chute 111, the first driving rod 1211 is disposed in an inner cavity of the base 110, and a portion of the first driving block 122 is exposed through the chute 111 and connected to the supporting platform 130. The first driving rod 1211 is specifically a screw, and the first driving block 122 may be a cylindrical screw sleeve.

As shown in fig. 2 to 3, in one embodiment, the limiting mechanism 140 further includes a second limiting member 144 connected to the base 110, and the second limiting member 144 is located below the rotating member 142; when the rotating member 142 rotates to abut against the second limiting member 144, the second limiting member 144 limits the deflection of the rotating member 142.

By arranging the second limiting piece 144, on one hand, the supporting function on the rotating piece 142 can be achieved, the compression resistance of the rotating piece 142 is increased, damage when the pressure of the rotating piece 142 is overlarge is avoided, and the rotating piece is enabled to rotate more reliably; on the other hand, when the rotation of the rotation member 142 about the first rotation shaft 143 is not limited by the first stopper 141 or the like, the second stopper 144 can control the deflection angle of the rotation member 142, preventing the deflection angle from being excessively large, which may cause the position locking function to be affected. The second limiting member 144 is approximately L-shaped, and includes a horizontal section and an inclined section, and an inclined surface is disposed on the inclined section. When the first limiting member 141 does not abut against the rotating member 142 and the second limiting member 144 rotates clockwise, the first end cannot continue to deflect clockwise around the first rotating shaft 143 when it deflects to abut against the inclined surface. Correspondingly, when the rotating member 142 rotates counterclockwise, the rotating member 142 does not continue to rotate counterclockwise when the second end rotates to abut against the horizontal segment. By arranging the second limiting piece 144, the deflection amplitude of the rotating piece 142 is controlled, the abutting reliability of the first limiting piece 141 and the rotating piece 142 is further ensured, and the reliability of position locking is improved.

As shown in fig. 2 to 3, in one embodiment, a first elastic member 145 is connected between the second end and the second limiting member 144, and the first elastic member 145 is configured to drive the rotating member 142 to rotate until the second end abuts against the first limiting member 141 when the external force is removed.

Specifically, when the first driving block 122 is driven to rise by the first driving member 121, the first driving block 122 will first abut against the lower end surface of the rotating member 142; as the first driving block 122 moves up, the rotating member 142 is shifted to deflect counterclockwise, so that the second end of the rotating member 142 deflects downward, and the first elastic member 145 is compressed; until the first driving block 122 moves up to the lower side of the rotating member 142, the toggle force acting on the rotating member 142 disappears, and the rotating member 142 automatically resets to the horizontal state, i.e. parallel to the horizontal plane, under the elastic force of the first elastic member 145. Through setting up first elastic component 145 for rotate the piece 142 and take place the back of deflecting, can reset to initial position voluntarily, need not the manual work and reset, and then when making first drive piece 122 move down, the first end of rotating the piece 142 can play better supporting role to first drive piece 122.

As shown in fig. 2 to 3, in one embodiment, the number of the limiting mechanisms 140 is multiple, and the multiple limiting mechanisms 140 are spaced apart in the vertical direction (Z direction).

Specifically, the first limiting member 141, the rotating member 142 and the second limiting member 144 are correspondingly provided with a plurality of limiting members, the number of the respective components is in one-to-one correspondence, and each first limiting member 141 is correspondingly provided with the rotating member 142 and the second limiting member 144. Through setting up multiunit stop gear 140 for when first drive piece 122 risees to different co-altitude, homoenergetic cooperatees with corresponding stop gear 140, rotates the piece 142 promptly and can support first drive piece 122, and first locating part 141 is spacing to rotating the piece 142, guarantees the reliability of supporting platform 130 place high position, and the setting of first locating part 141 can restrict the downwardly moving of first drive piece 122, reduces the unexpected risk of whereabouts of first drive piece 122.

FIG. 5 is a schematic view of the lifting device 100 shown in FIG. 1 at a second view angle; fig. 6 is an enlarged view of the lifting device 100 shown in fig. 5 at B. As shown in fig. 2, 3, 5 and 6, in one embodiment, the lifting device 100 further includes a second driving rod 151 and a second driving block 152 screwed to the second driving rod 151, where the second driving block 152 is slidably connected to the base 110; the first limiting member 141 is connected to the second driving block 152; the second driving rod 151 is configured to operatively rotate to drive the second driving block 152 to move in a vertical direction (Z direction), and the first limiting member 141 is driven to move by the second driving block 152.

The first limiting member 141 is driven to move by the cooperation of the second driving rod 151 and the second driving block 152, for example, the first limiting member 141 is driven to move upwards, so that the first limiting member 141 is not abutted to the rotating member 142 any more, and the second end of the rotating member 142 can deflect upwards, so that a downward moving space is reserved for the first driving block 122, and the height of the supporting platform 130 is conveniently adjusted.

Taking the limiting mechanism 140 as an example, the lifting device 100 further includes a connecting plate 153, the plurality of first limiting members 141 are all connected to one side of the connecting plate 153, the connecting plate 153 is connected to the second driving block 152, and the second driving block 152 drives the connecting plate 153 to move, so that the first limiting members 141 synchronously move.

As shown in fig. 5 and 6, in one embodiment, the lifting device 100 further includes a driving wheel, a driven wheel 154, and a driving belt 155, wherein the driving belt 155 is in tension connection with the driving wheel and the driven wheel 154; the driving wheel is rotatably connected to the base 110, and the second driving rod 151 is connected to the driven wheel 154 and is rotated by the driven wheel 154.

Specifically, a rotating disc 156 is connected to the driving wheel, and the driving wheel is driven to rotate by operating the rotating disc 156, so that the driven wheel 154 is driven to rotate under the action of the driving belt 155, and the second driving block 152 is driven to lift under the transmission of the second driving rod 151. By providing the rotating disc 156, the position of the first stopper 141 is more conveniently adjusted. Further, a supporting frame 157 is further disposed on the base 110 for limiting the rotating disc 156. The problem of loosening of the equipment is avoided when the positions of the first limiting member 141 and the connecting plate 153 are adjusted.

Wherein the driving and driven gears 154 may be gears and the driving belt 155 may be a belt. In another embodiment, the driving wheel and the driven wheel may also be sprockets, and the driving belt is a chain.

As shown in fig. 2, the second elastic member 158 is connected between the connection plate 153 and the base 110, and the second elastic member 158 is in a deformed state during the movement of the connection plate 153 in the vertical direction (Z direction). By providing the second elastic member 158, a certain buffering effect is achieved, and vibration generated when each component operates is reduced.

Fig. 4 is a schematic view of the support platform 130 in the lifting device 100 shown in fig. 2. As shown in fig. 2, 4, and 5, in one embodiment, the lifting device 100 further includes an adjusting mechanism 160, where the adjusting mechanism 160 includes a fixing member 161 and a moving member 162, the fixing member 161 is connected to the first driving block 122, and the moving member 162 is slidably connected to the fixing member 161 in a horizontal direction; the support platform 130 is coupled to the moving member 162. As shown, the horizontal direction is illustrated by the X direction.

Specifically, the fixing member 161 is configured with a guide groove, and a portion of the moving member 162 is protruded into the guide groove and can slide in the guide groove, so that the length of the supporting platform 130 protruded in the horizontal direction (X direction) is changed, so that the supporting platform 130 can be moved to the lower portion of the automobile, so that the automobile can be positioned on the supporting platform 130, and the accuracy of the equipment in positioning is increased.

As shown in fig. 2 and 4, in one embodiment, the moving member 162 is configured with a rotating groove 1621, and the support platform 130 is rotatably coupled to a groove wall of the rotating groove 1621 about a vertical direction (Z direction) as an axis. Specifically, the end of the moving member 162 has a disk shape, and the rotating groove 1621 is provided on the circular table. By providing the rotation groove 1621, the support platform 130 is enabled to rotate within the rotation groove 1621, thereby adjusting the position of the support platform 130. The bottom of the supporting platform 130 is connected with an L-shaped supporting seat, and the supporting seat is connected with the groove wall of the rotating groove 1621. The supporting platform 130 resists the positive rotation by sixty degrees and reverses the rotation by sixty degrees with the center of the rotating groove 1621 as the origin, and has larger rotation amplitude.

As shown in fig. 4, in one embodiment, a buffer 131 is provided on the support platform 130. The buffer member 131 is coated on the supporting platform 130. The buffer member 131 is specifically a buffer pad, and the support platform 130 performs buffer support when the vehicle is jacked up.

In yet another embodiment, a pressure detector 132 is provided on the support platform 130. The pressure detector 132 is specifically installed inside the buffer 131. The pressure detector 132 is provided in plurality, and the magnitude of the pressure of the vehicle acting on the support platform 130 can be detected by the pressure detector 132. The pressure detector 132 may specifically be a pressure sensor.

Specifically, after the buffer member 131 contacts the bottom of the automobile, the buffer member 131 may be supported while the pressure detector 132 detects the pressure to which the buffer member 131 is subjected. When the pressure detectors 132 are all installed at the lower part of the automobile, the pressure detectors 132 can be sequentially detected, and when the pressure difference between the pressure detectors 132 is too large, the supporting platform 130 is not completely contacted with the bottom of the automobile, the supporting platform 130 is moved until the pressure difference detected by the pressure detectors 132 is smaller, and the pressure at each position is relatively uniform, so that the buffer member 131 is considered to be fully contacted with the automobile. Through setting up a plurality of pressure detector 132 for bolster 131 and car fully contact, thereby guarantee the stability of support, reduce and support unstable risk that leads to the car landing.

In use, the lifting device 100 adjusts the length between the fixing member 161 and the moving member 162, and simultaneously adjusts the support platform 130 to rotate in the rotation groove 1621 so as to move to the lower portion of the vehicle. The first driving rod 1211 is started, the first driving rod 1211 and the first driving block 122 are in spiral transmission, after the first driving rod 1211 carries the first driving block 122 to move upwards, the first driving block 122 pushes the rotating member 142 to move upwards, and the first elastic member 145 is compressed. When the first driving block 122 is deviated from the second end of the rotating member 142, the rotating member 142 returns to the original state under the elastic force of the first elastic member 145. When the first driving block 122 has a tendency of sliding down, the first limiting member 141 limits the position of the rotating member 142 by clamping, so that the position of the first driving block 122 can be limited, and the problem that the first driving block 122 slides to cause the automobile to separate from the supporting platform 130 is avoided. And when the first driving block 122 needs to be carried and moved downwards, the rotating disc 156 drives the second driving rod 151 to rotate synchronously, namely, the position of the second driving rod 151 carrying the connecting plate 153 and the first limiting piece 141 is adjusted, and meanwhile, the first limiting piece 141 deviates from the rotating piece 142, namely, the first end of the rotating piece 142 can deflect upwards, and the second end can deflect downwards, so that a movable space is provided for the first driving block 122, and the stability of the automobile during jacking is increased.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A lifting device, comprising:

a base (110);

a lifting mechanism (120) connected to the base (110); the lifting mechanism (120) comprises a first driving piece (121) and a first driving block (122) connected to the first driving piece (121); the first driving piece (121) is used for driving the first driving block (122) to lift along the vertical direction;

-a support platform (130) connected to the first drive block (122);

the limiting mechanism (140), the limiting mechanism (140) comprises a first limiting piece (141), a rotating piece (142) and a first rotating shaft (143) connected to the base (110); the first limiting piece (141) is connected to the base (110); the rotating piece (142) can rotate around a first rotating shaft (143) relative to the base (110); the first end of the rotating piece (142) is used for abutting against the lower end face of the first driving block (122); the second end of the rotating piece (142) is used for abutting against the lower end face of the first limiting piece (141), so that the first limiting piece (141) limits the second end to deflect upwards; the first end and the second end are respectively positioned at two sides of the first rotating shaft (143).

2. The lifting device according to claim 1, wherein the limit mechanism (140) further comprises a second limit piece (144) connected to the base (110); the second limiting piece (144) is positioned below the rotating piece (142);

when the rotating piece (142) rotates to be abutted against the second limiting piece (144), the second limiting piece (144) limits deflection of the rotating piece (142).

3. The lifting device according to claim 2, wherein a first elastic member (145) is connected between the second end and the second limiting member (144), and the first elastic member (145) is configured to drive the rotating member (142) to rotate until the second end abuts against the first limiting member (141) when the external force is removed.

4. The lifting device according to claim 1, wherein the number of the limiting mechanisms (140) is multiple, and the multiple limiting mechanisms (140) are distributed at intervals along the vertical direction.

5. The lifting device according to claim 1, further comprising a second drive rod (151) and a second drive block (152) screwed to the second drive rod (151), the second drive block (152) being slidingly connected to the base (110); the first limiting piece (141) is connected to the second driving block (152);

the second driving rod (151) is configured to operatively rotate to drive the second driving block (152) to move along the vertical direction, and the first limiting piece (141) is driven to move by the second driving block (152).

6. The lifting device according to claim 5, further comprising a drive wheel, a driven wheel (154) and a drive belt (155), the drive belt (155) being in tension connection with the drive wheel and the driven wheel (154);

the driving wheel is rotatably connected to the base (110), and the second driving rod (151) is connected to the driven wheel (154) and is driven by the driven wheel (154) to rotate.

7. The lifting device according to claim 1, further comprising an adjustment mechanism (160), the adjustment mechanism (160) comprising a fixed member (161) and a moving member (162), the fixed member (161) being connected to the first drive block (122); the moving piece (162) is connected to the fixed piece (161) in a sliding way along the horizontal direction; the support platform (130) is connected to the moving member (162).

8. A lifting device according to claim 7, characterized in that the displacement member (162) is configured with a rotation groove (1621), the support platform (130) being rotatably connected to the groove wall of the rotation groove (1621) with the vertical direction as axis.

9. Lifting device according to claim 1, characterized in that the support platform (130) is provided with a buffer (131); and/or

The support platform (130) is provided with a pressure detector (132).

10. The lifting device according to claim 1, wherein the first drive (121) comprises a first drive rod (1211); the first driving block (122) is connected to the first driving rod (1211) in a threaded manner and is connected to the base (110) in a sliding manner;

the first drive rod (1211) is configured to operably rotate to raise and lower the first drive block (122) in the vertical direction.

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