CN219297078U - Multi-frame limiting device and lifting mechanism - Google Patents

Abstract

The utility model discloses a multi-frame limiting device and a lifting mechanism, the multi-frame limiting device comprises a plurality of constraint components arranged between adjacent lifting frames, the constraint components comprise a first limiting structure connected with a front lifting frame, a second limiting structure connected with a rear lifting frame and a movable structure, a limiting channel is longitudinally arranged on the first limiting structure, a second limiting part of the second limiting structure can longitudinally extend into or withdraw from the limiting channel along with the relative folding or unfolding of the adjacent lifting frames, and a rolling part of the movable structure is provided with a contact surface which can be abutted against the rear part of the second limiting part and longitudinally move along with the second limiting part to roll. The multi-frame limiting device and the lifting mechanism can restrict the relative transverse movement of the adjacent lifting frames, so that the mutual shaking or collision is reduced, the stability of the structure between the lifting frames is improved, and the stable transportation is ensured.

Description

Multi-frame limiting device and lifting mechanism

Technical Field

The utility model relates to the field of conveying equipment, in particular to a multi-frame limiting device and a lifting mechanism.

Background

Along with the improvement of the industrial automation level, the automatic loading and transporting robot gradually walks into various large production workshops, especially in workshops with severe working environments, the automatic loading and transporting robot can replace the operations of manpower transportation, transportation and the like, the physical harm to staff is reduced, and the working efficiency is greatly improved.

The existing automatic loading and transporting robot mainly comprises a portal frame paved on a working site, a free translation lifting mechanism arranged on the portal frame and a cargo carrying mechanism arranged on lifting equipment, wherein the lifting mechanism can drive the cargo carrying mechanism to move to different height positions. The utility model patent (publication number: CN 104942826B) discloses a robot lifting device and a lifting method, which comprises a hanging mechanism, a machine body sliding arm system, a head pulling rope and a tail pulling rope, wherein the machine body sliding arm system comprises a plurality of stages of sliding arms and a second guide rail, a second lower pulley is arranged at the lower end of the second guide rail, the head pulling rope sequentially passes through the second lower pulley and pulley blocks on each stage of sliding arms by utilizing the pulley principle, the tail pulling rope is connected with the last stage of sliding arm, and the single motor driving mechanism is used for realizing the stage lifting, so that goods with different heights can be fetched and placed in a descending and unfolding state, and the goods can be horizontally moved in an ascending and folding state. However, in the technical scheme, the structural stability between the sliding arms at all levels is poor, so that the sliding arms at all levels which are adjacently arranged are easily influenced by inertia acting force when in a folded state, and are mutually transversely swayed, collided or separated, so that the smooth transportation of cargoes is not facilitated.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the multi-frame limiting device and the lifting mechanism, wherein the multi-frame limiting device comprises a plurality of constraint components which are arranged between adjacent lifting frames, so that the relative transverse movement of the adjacent lifting frames can be constrained, the mutual shaking or collision is reduced, the stability of the structure between the lifting frames is improved, and the stable transportation is ensured.

The technical scheme of the utility model is as follows:

the multi-frame limiting device comprises a plurality of constraint components arranged between adjacent lifting frames, wherein each constraint component comprises a first limiting structure, a second limiting structure and a movable structure, the first limiting structure comprises a first connecting piece connected with a lifting frame in front and a first limiting piece connected with the first connecting piece, and a limiting channel is longitudinally arranged on the first limiting piece; the second limiting structure comprises a second connecting piece connected with the rear lifting frame and a second limiting piece connected with the second connecting piece, the second limiting piece is longitudinally arranged in the length direction and can longitudinally extend into the limiting channel to be connected with the first limiting structure along with the relative folding of the adjacent lifting frames, and longitudinally withdraw out of the limiting channel to be separated from the first limiting structure along with the relative unfolding of the adjacent lifting frames; the movable structure comprises a mounting assembly connected with the rear part of the first limiting part and a rolling part arranged at the front end of the mounting assembly, the front part of the rolling part is provided with a contact surface which can be propped against the rear part of the second limiting part and roll along with the longitudinal movement of the second limiting part, and the distance between the contact surface and the surface of the front wall of the limiting channel is smaller than the distance between the front wall and the rear wall of the limiting channel.

Preferably, after the second limiting piece stretches into the limiting channel, the outer peripheral wall of the second limiting piece and the surface of the peripheral wall of the limiting channel are provided with movable gaps, and the second limiting piece can transversely move along the movable gaps in the limiting channel.

Preferably, the mounting assembly comprises a rolling base for mounting rolling elements, a positioning shaft is horizontally arranged at the front end of the rolling base along the parallel direction of the lifting frame, and the rolling elements are rotatably connected with the rolling base through the positioning shaft.

Preferably, the rolling base comprises two base plates which are vertically arranged with the positioning shaft and a connecting plate connected between the rear parts of the two base plates, shaft holes are transversely formed in the two base plates in a penetrating mode, a shaft channel is transversely formed in the rolling piece in a penetrating mode, the rolling piece is arranged in an installation area formed between the two base plates, the positioning shaft penetrates through the shaft channel, and two ends of the positioning shaft penetrate out of the outside through the shaft holes and are limited to the outer sides of the base plates through the positioning piece.

Preferably, the free end at the rear part of the second limiting part is provided with an inclined surface, and the distance between the inclined surface and the front wall of the limiting channel is gradually increased from bottom to top.

Preferably, the mounting assembly further comprises a connecting base connected with the first limiting member and an elastic buffer member arranged between the connecting base and the rolling base, wherein the elastic buffer member can provide a buffer force for preventing the second limiting member from moving backwards when the second limiting member moves backwards to the extrusion contact surface at the rear part of the second limiting member.

Preferably, the first connecting piece and the first limiting piece are arranged as parallel horizontal plate structures arranged at intervals and are connected through the first abutting plate, the first connecting piece is connected to the front portion of the upper end of the first abutting plate, the first limiting piece is connected to the rear portion of the lower end of the first abutting plate, the limiting channel penetrates through the first limiting piece, the movable structure is connected to the upper side of the first limiting piece and is arranged in adjacent constraint components among the lifting frames, the first limiting pieces of the front constraint components are arranged below the first connecting pieces of the rear constraint components at intervals in parallel and form an interval space capable of containing the movable structure, and when the lifting frames are in a folded state, the first connecting pieces of the constraint components arranged adjacently are located on the same horizontal plane, and the first limiting pieces are located on the same horizontal plane.

Preferably, the top of the first connecting piece is connected to the lifting frame, and the second connecting piece of the front restraining assembly of the adjacent restraining assemblies is connected to the front part of the first connecting piece of the rear restraining assembly.

Preferably, the length direction of the second connecting piece is arranged transversely, the length directions of the second connecting piece and the second limiting piece are arranged in parallel with the lifting frame, and the upper end of the second limiting piece is connected with the middle position of the bottom of the second connecting piece.

The utility model also discloses a lifting mechanism, which comprises a bracket, a first lifting frame, a second lifting frame and a third lifting frame which are sequentially arranged in front of the bracket, wherein the lifting frames and the bracket which are adjacently arranged are mutually connected through a synchronous lifting mechanism and a guide mechanism, and the lifting frames can be simultaneously unfolded in a descending way or folded in a lifting way under the driving of the synchronous lifting mechanism; the bottoms of the two sides of each lifting frame are connected through the multi-frame limiting device; the lifting device comprises a first lifting frame, a first limiting structure is arranged on two sides of the lower end of the first lifting frame, a third limiting structure corresponding to the first limiting structure is arranged on two sides of the lower portion of the bracket, the third limiting structure comprises a third connecting piece connected with the bracket and a third limiting piece connected with the front end of the bottom of the third connecting piece, the third limiting piece is arranged to be of the same structure as the second limiting piece, and can longitudinally extend into a limiting channel along with the rising of the first lifting frame to be connected with the first limiting structure, and longitudinally withdraw out of the limiting channel along with the falling of the first lifting frame to be separated from the first limiting structure.

The multi-frame limiting device comprises a plurality of limiting components which are arranged between adjacent lifting frames, wherein each limiting component comprises a first limiting structure connected with a front lifting frame and a second limiting structure connected with a rear lifting frame, a limiting channel is longitudinally arranged on a first limiting part of the first limiting structure, a second limiting part of the second limiting structure is longitudinally arranged along the length direction, and the second limiting part can longitudinally extend into the limiting channel along with the relative folding of the adjacent lifting frames and is connected with the first limiting structure, so that the relative transverse movement of the adjacent lifting frames after folding is restrained, the adjacent lifting frames can be prevented from being separated from each other transversely and from moving, the shaking or collision among the adjacent lifting frames is reduced, the stability of the structures among the lifting frames is improved, stable transportation is ensured, and the second limiting part longitudinally extends out of the limiting channel along with the relative unfolding of the adjacent lifting frames and is separated from the first limiting structure, and the normal lifting movement of the lifting frames is ensured. The second limiting piece can be directly connected with or separated from the first limiting structure along with the movement of the lifting frame, independent operation is not needed, and the lifting frame is very convenient, efficient and time-saving to use and extremely strong in practicality. In addition, still be provided with the movable structure on the first locating part, this movable structure includes the installation component that links to each other with first locating part rear portion and installs the rolling element at the installation component front end, the front portion of rolling element has the contact surface that can lean on and roll along with second locating part longitudinal movement with second locating part rear portion for second locating part and contact surface rolling friction, frictional force is less, be favorable to guiding second locating part to vertically stretch into or take out spacing passageway, still transversely rock relatively at adjacent lifting frame simultaneously, collide or provide certain buffer force through relative roll when moving towards the direction of mutual separation, avoid the rigidity to pull, increase of service life, the noise is reduced. The distance between the contact surface and the front wall of the limiting channel is smaller than the distance between the front wall and the rear wall of the limiting channel, so that the rear part of the second limiting piece can only be abutted against the contact surface, but not the rear wall of the limiting channel, and the phenomenon that the rear part of the second limiting piece rubs against the rear wall of the limiting channel to influence the normal lifting movement of the lifting frame is avoided.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a multi-frame limiting device according to an embodiment of the present utility model.

FIG. 2 is a schematic diagram of a restraint assembly according to an embodiment of the present utility model.

FIG. 3 is an exploded view of a restraint assembly in accordance with one embodiment of the present utility model.

FIG. 4 is a cross-sectional view of a restraint assembly in accordance with an embodiment of the present utility model.

Fig. 5 is a schematic exploded view of a movable structure according to an embodiment of the present utility model.

Fig. 6 is a schematic structural diagram of a second limiting structure according to an embodiment of the present utility model.

Fig. 7 is a schematic structural diagram of a lifting mechanism according to an embodiment of the present utility model.

Fig. 8 is a schematic view illustrating a structure of a lifting frame according to an embodiment of the utility model.

Fig. 9 is a schematic structural view of a third limiting structure according to an embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

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 connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. 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 "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact, but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

As shown in fig. 1 to 3, as an embodiment of the present utility model, a multi-frame spacing device 100 is disclosed, comprising a plurality of constraint modules 10 arranged between adjacent lifting frames, the constraint modules 10 comprising a first spacing structure 1, a second spacing structure 2 and a movable structure 3, wherein the first spacing structure 1 comprises a first connection member 11 connected to a front lifting frame and a first spacing member 12 connected to the first connection member 11, and the second spacing structure 2 comprises a second connection member 21 connected to a rear lifting frame and a second spacing member 22 connected to the second connection member 21. The first limiting piece 12 is longitudinally provided with the limiting channel 121, the second limiting piece 22 is longitudinally arranged along the length direction, and the second limiting piece can longitudinally extend into the limiting channel 121 along with the relative folding of the adjacent lifting frames and is connected with the first limiting structure 1, so that the relative transverse movement of the folded adjacent lifting frames is restrained, the adjacent lifting frames can be prevented from being separated from each other by transversely deviating from each other, the mutual shaking or collision is reduced, the stability of the structures among the lifting frames is improved, and the stable transportation is ensured; the second limiting piece 22 is longitudinally pulled out of the limiting channel 121 along with the relative unfolding of the adjacent lifting frames and separated from the first limiting structure 1, so that the normal lifting movement of the lifting frames is ensured. The second limiting piece 22 can be directly connected with or separated from the first limiting structure 1 along with the movement of the lifting frame, no separate operation is needed, and the use is very convenient, efficient and time-saving, and the practicability is very strong. The movable structure 3 comprises a mounting assembly 31 connected with the rear part of the first limiting part 12 and a rolling part 32 arranged at the front end of the mounting assembly 31, wherein the front part of the rolling part 32 is provided with a contact surface 321 which can be propped against the rear part of the second limiting part 22 and roll along with the longitudinal movement of the second limiting part 22, so that the second limiting part 22 and the contact surface 321 are in rolling friction, the friction force is small, the second limiting part 22 is beneficial to guiding the second limiting part 22 to longitudinally extend into or withdraw from a limiting channel 121, and meanwhile, a certain buffer force is provided through relative rolling when adjacent lifting frames relatively transversely shake, collide or move towards the direction of mutual separation, rigid pulling is avoided, the service life is prolonged, and noise is reduced. The distance between the contact surface 321 and the front wall of the limiting channel 121 is smaller than the distance between the front wall and the rear wall of the limiting channel 121, so that the rear part of the second limiting piece 22 can only abut against the contact surface 321, but cannot abut against the rear wall of the limiting channel 121, and the phenomenon that the rear part of the second limiting piece 22 rubs against the rear wall of the limiting channel 121 to affect the normal lifting movement of the lifting frame is avoided.

As shown in fig. 4, in some embodiments, after the second limiting member 22 extends into the limiting channel 121, a movable gap is formed between the outer wall of the second limiting member and the surface of the peripheral wall of the limiting channel 121, the width between the front wall and the rear wall of the second limiting member 22 is smaller than the width between the front wall and the rear wall of the limiting channel 121, the width between the left wall and the right wall of the second limiting member 22 is smaller than the width between the left wall and the right wall of the limiting channel 121, enough movable space is reserved for the lateral movement of the second limiting member 22 in the limiting channel 121, the second limiting member 22 can move freely in the limiting channel 121 along the movable gap, and the relative lateral movement range between adjacent lifting frames is limited in the movable space, so that the inertia effect in the process of buffering the movement required between the lifting frames is reserved, and the second limiting member 22 is convenient to extend into or withdraw from the limiting channel 121.

As shown in fig. 5, in some embodiments, the mounting assembly 31 includes a rolling base 311 for mounting the rolling members 32, facilitating handling of the rolling members 32. The front end of the rolling base 311 is horizontally provided with a positioning shaft 312 along the parallel direction of the lifting frame, and the rolling element 32 is rotatably connected with the rolling base 311 through the positioning shaft 312, so that the lifting frame can be better restrained from moving along the vertical direction.

In some embodiments, the rolling base 311 includes two base plates disposed perpendicular to the positioning shaft 312 and a connecting plate connected between the rear portions of the two base plates, and in this embodiment, the rolling base 311 is configured as an integrally formed U-shaped structure, and is durable and durable, and the two base plates are two side plates of the U-shaped structure respectively. The two base plates transversely penetrate through the shaft holes 3111, the rolling elements 32 are of a cylindrical structure which is transversely arranged, the rolling elements 32 transversely penetrate through the shaft channels 322, the rolling elements 32 are arranged in an installation area formed between the two base plates, the positioning shafts 312 penetrate through the shaft channels 322, two ends of the positioning shafts 312 penetrate through the shaft holes 3111 outside and are limited to the outer sides of the base plates through the positioning elements 313 respectively, and the rolling elements 32 can rotate relative to the rolling bases 311 around the axis of the positioning shafts 312. In this embodiment, the positioning member 313 is configured as a pin shaft, and the pin shaft is inserted into a positioning hole radially penetrating the end of the positioning shaft 312, which is simple in structure and convenient to assemble, however, in other embodiments, the positioning member 313 may be configured as a baffle or other structure capable of preventing the positioning shaft 312 from being disconnected from the rolling base 311.

As shown in fig. 4 or 6, in some embodiments, the free end at the rear of the second limiting member 22 is provided with an inclined surface 221, the distance between the inclined surface 221 and the front wall of the limiting channel 121 gradually increases from bottom to top, when the second limiting member 22 just enters the limiting channel 121, the second limiting member 22 can be guided to gradually extend into the inside of the limiting channel 121 through rolling friction between the inclined surface 221 and the contact surface 321, the vertical distance between the adjacent lifting frames is gradually restricted and reduced, before the second limiting member 22 leaves the limiting channel 121, the second limiting member 22 can be guided to gradually withdraw from the limiting channel 121 through rolling friction between the inclined surface 221 and the contact surface 321, and the restriction on the vertical distance between the adjacent lifting frames is gradually released, so that a transient buffer process exists before and after the restriction, and the interconnection or separation between the second limiting structure 2 and the first limiting structure 1 is facilitated.

As shown in fig. 5, in some embodiments, the mounting assembly 31 further includes a connection base 314 and an elastic buffer member 315 disposed between the connection base 314 and the rolling base 311, where the connection base 314 is used to connect with the first limiting member 12, so that the mounting assembly 31 as a whole is assembled with or disassembled from the first limiting member 12, the elastic buffer member 315 is configured as a soft rubber block, and front and rear sides of the elastic buffer member 315 are respectively bonded with a rear side of the rolling base 311 and a front side of the connection base 314, and are movably connected through two guide channels 316 disposed on the rolling base 311, the elastic buffer member 315, and the connection base 314 along a front and rear direction of the mounting assembly 31, and guide members (not shown in the figure) disposed in the guide channels 316. The elastic buffer 315 can provide a buffer force for preventing the second limiting member 22 from moving backwards when the second limiting member 22 moves backwards to the contact surface 321 pressed at the rear part of the second limiting member 22, so that rigid pulling between the second limiting structure 2 and the first limiting structure 1 is further avoided, the service life is prolonged, and noise is reduced. Of course, in other embodiments, the elastic buffer member 315 may be configured as an elastic structure made of other soft materials such as silica gel, or configured as other elastic structures with elastic buffer effects such as springs and pistons, which can provide a certain buffer force when the second limiting member 12 moves backward.

As shown in fig. 4, in some embodiments, the first connecting member 11 and the first limiting member 12 are arranged in a horizontal plate structure arranged at intervals in parallel and are connected through the first abutting plate 13, the first connecting member 11 is connected to the front portion of the upper end of the first abutting plate 13, the first limiting member 12 is connected to the rear portion of the lower end of the first abutting plate 13, and the limiting channel 121 penetrates through the first limiting member 12, so that the setting length of the second limiting member 22 has no fixing requirement, the length of the second limiting member 22 can be set to be greater than the thickness of the first limiting member 12, the whole part of the second limiting member extends into the limiting channel 121, the connection is firm, the connection is not easy to break away, and the structure is simple, and the production and the processing are convenient. The front and rear sides of the first butt joint plate 13 are respectively provided with a first reinforcing plate 14, the first reinforcing plate 14 at the front side is fixedly connected with the bottom side of the rear end of the first connecting piece 11 and the front side of the first butt joint plate 13 at the same time, and the first reinforcing plate 14 at the rear side is fixedly connected with the rear end face of the first connecting piece 11, the rear side face of the first butt joint plate 13 and the upper side of the first limiting piece 12 at the same time. The movable structure 3 is connected to the upper side of the first limiting part 12, and the bottom surfaces of the rolling base 311, the connecting base 314 and the elastic buffer 315 are in contact with the top surface of the first limiting part 12, so that the rolling base 311, the connecting base 314 and the elastic buffer 315 are supported on the first limiting part 12, and the connection stability is good and the connection is not easy to loose.

As shown in fig. 1, in some embodiments, in the adjacent restraint assemblies 10 disposed between the lifting frames, the first limiting members 12 of the front restraint assembly 10 are disposed in parallel and spaced below the first connecting member 11 of the rear restraint assembly 10 and form a spaced space capable of accommodating the movable structure 3, and the structural design is compact and smart. When each lifting frame is in a furled state, the first connecting pieces 11 of the constraint components 10 which are adjacently arranged are positioned on the same horizontal plane, and the first limiting pieces 12 are positioned on the same horizontal plane, so that each constraint component 10 is sequentially embedded and arranged, the multi-frame limiting device 100 can be provided with one, two, three or other constraint components 10 with various numbers, and the multi-frame limiting device is applicable to use among one, two, three or other lifting frames with various numbers, and has wide application range and extremely strong practicability.

In some embodiments, the top of the first connecting piece 11 is connected to the lifting frame, and the second connecting piece 21 of the front constraint component in the adjacent constraint component 10 is connected to the front part of the first connecting piece 11 of the rear constraint component, so that the second connecting piece 21 of the front constraint component is connected to the rear lifting frame through the first connecting piece 11 of the rear constraint component, and each constraint component arranged adjacently is combined into a whole, so that the structure design is simple and ingenious. In the present embodiment, the second connecting member 21 is fastened and connected by the connecting holes arranged on the front portions of the second connecting member 21 and the first connecting member 11 in the front-rear direction and the fasteners (not shown in the drawings) which are cooperatively connected with the connecting holes, so that the separate production or replacement is facilitated, and of course, in other embodiments, the second connecting member 21 and the first connecting member 11 may be provided as an integral structure to enhance the stability of the structure.

As shown in fig. 6, in some specific embodiments, the length direction of the second connecting piece 21 is arranged along the transverse direction, and the length directions of the second connecting piece 21 and the second limiting piece 22 are arranged in parallel with the lifting frame, the upper end of the second limiting piece 22 is connected with the middle position of the bottom of the second connecting piece 21, so that the torsion resistance is strong, and in this embodiment, the second limiting structure 2 is provided as an integrally formed T-shaped structure, and the structure is simple, firm and durable, and is convenient for production and processing.

As another embodiment of the present utility model, as shown in fig. 7, there is also disclosed a lifting mechanism comprising a bracket 4 and a first lifting frame 5, a second lifting frame 6 and a third lifting frame 7 sequentially arranged in front of the bracket 4, wherein each of the adjacent lifting frames and the bracket are connected with each other by a synchronous lifting mechanism 8 and a guiding mechanism 9, and each lifting frame can be simultaneously unfolded in a descending or folded in a lifting manner under the driving of the synchronous lifting mechanism 8. The bottoms of the two sides of each lifting frame are connected through the multi-frame limiting device 100 disclosed by the embodiment, the bottoms of the two sides of each lifting frame are respectively restrained through the multi-frame limiting device 100, the restraining balance is better, the mutual shaking or collision is more convenient to reduce, and the stable transportation operation is ensured.

As shown in fig. 8 to 9, in some embodiments, the two sides of the lower end of the first lifting frame 5 are respectively provided with a first limiting structure 1, the two sides of the lower portion of the bracket 4 are respectively provided with a third limiting structure 2 'corresponding to the first limiting structure 1, the third limiting structure 2' includes a third connecting piece 21 'connected with the bracket 1 and a third limiting piece 22' connected with the front end of the bottom of the third connecting piece 21', and the third limiting piece 22' is configured to be the same structure as the second limiting piece 22, and can longitudinally extend into the limiting channel 121 to be connected with the first limiting structure 1 along with the rising of the first lifting frame 5, and longitudinally withdraw out of the limiting channel 121 to be separated from the first limiting structure 1 along with the falling of the first lifting frame 5. The second limiting structures 2 at the front parts of the first limiting structures 1 at the two sides of the lower end of the third lifting frame 7 can be or need not be arranged.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

In summary, the foregoing description is only of the preferred embodiments of the present utility model, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the utility model.

Claims (10)

1. A multi-frame spacing device comprising a plurality of restraint assemblies disposed between adjacent lifting frames, the restraint assemblies comprising:

the first limiting structure comprises a first connecting piece connected with a lifting frame in front and a first limiting piece connected with the first connecting piece, and a limiting channel is longitudinally arranged on the first limiting piece;

the second limiting structure comprises a second connecting piece connected with the rear lifting frame and a second limiting piece connected with the second connecting piece, the second limiting piece is longitudinally arranged in the length direction and can longitudinally extend into the limiting channel to be connected with the first limiting structure along with the relative folding of the adjacent lifting frames, and longitudinally draw out of the limiting channel to be separated from the first limiting structure along with the relative unfolding of the adjacent lifting frames;

the movable structure comprises a mounting assembly connected with the rear part of the first limiting part and a rolling part arranged at the front end of the mounting assembly, wherein the front part of the rolling part is provided with a contact surface which can be propped against the rear part of the second limiting part and roll along with the longitudinal movement of the second limiting part, and the distance between the contact surface and the surface of the front wall of the limiting channel is smaller than the distance between the front wall and the rear wall of the limiting channel.

2. The multi-frame spacing device of claim 1, wherein: the second limiting piece stretches into the limiting channel, the outer peripheral wall of the second limiting piece and the surface of the peripheral wall of the limiting channel are provided with movable gaps, and the second limiting piece can transversely move along the movable gaps in the limiting channel.

3. The multi-frame spacing device of claim 2, wherein: the installation assembly comprises a rolling base used for installing rolling elements, the front end of the rolling base is horizontally provided with a positioning shaft along the parallel direction of the lifting frame, and the rolling elements are rotatably connected with the rolling base through the positioning shaft.

4. A multi-frame spacing device as claimed in claim 3 wherein: the rolling base comprises two base plates and a connecting plate, wherein the two base plates are vertically arranged with a positioning shaft, the connecting plate is connected between the rear parts of the two base plates, a shaft hole is transversely formed in the two base plates in a penetrating mode, a shaft channel is transversely formed in the rolling element in a penetrating mode, the rolling element is arranged in an installation area formed between the two base plates, the positioning shaft penetrates through the shaft channel, and two ends of the positioning shaft penetrate through the outside through the shaft hole and are limited on the outer side of the base plates through the positioning element.

5. The multi-frame spacing device of claim 4, wherein: the free end at the rear part of the second limiting part is provided with an inclined plane, and the distance between the inclined plane and the front wall of the limiting channel is gradually increased from bottom to top.

6. The multi-frame spacing device of claim 5, wherein: the mounting assembly further comprises a connecting base and an elastic buffer piece, wherein the connecting base is used for being connected with the first limiting piece, the elastic buffer piece is arranged between the connecting base and the rolling base, and the elastic buffer piece can provide a buffer force for preventing the second limiting piece from moving backwards when the second limiting piece moves backwards to the extrusion contact surface at the rear part of the second limiting piece.

7. The multi-frame spacing device of claim 6, wherein: the first connecting piece and the first limiting piece are arranged to be parallel horizontal plate structures which are arranged at intervals and are connected through the first abutting plate, the first connecting piece is connected to the front portion of the upper end of the first abutting plate, the first limiting piece is connected to the rear portion of the lower end of the first abutting plate, the limiting channel penetrates through the first limiting piece, the movable structure is connected to the upper side of the first limiting piece and is arranged in adjacent constraint components among the lifting frames, the first limiting pieces of the front constraint components are arranged below the first connecting pieces of the rear constraint components at intervals in parallel and form an interval space capable of containing the movable structure, and when the lifting frames are in a folded state, the first connecting pieces of all adjacent constraint components are located on the same horizontal plane, and the first limiting pieces are located on the same horizontal plane.

8. The multi-frame spacing device of claim 7, wherein: the top of the first connecting piece is connected to the lifting frame, and the second connecting piece of the front restraining component in the adjacent restraining components is connected to the front part of the first connecting piece of the rear restraining component.

9. The multi-frame spacing device of claim 8, wherein: the length direction of the second connecting piece is arranged transversely, the length directions of the second connecting piece and the second limiting piece are arranged in parallel with the lifting frame, and the upper end of the second limiting piece is connected with the middle position of the bottom of the second connecting piece.

10. A lifting mechanism, characterized in that: the lifting frames are connected with the brackets through synchronous lifting mechanisms and guide mechanisms, and can be simultaneously unfolded in a descending mode or folded in a lifting mode under the driving of the synchronous lifting mechanisms;

the bottoms of the two sides of each lifting frame are connected through the multi-frame limiting device as claimed in any one of claims 1 to 9;

the lifting device comprises a first lifting frame, a first limiting structure is arranged on two sides of the lower end of the first lifting frame, a third limiting structure corresponding to the first limiting structure is arranged on two sides of the lower portion of the bracket, the third limiting structure comprises a third connecting piece connected with the bracket and a third limiting piece connected with the front end of the bottom of the third connecting piece, the third limiting piece is arranged to be of the same structure as the second limiting piece, and can longitudinally extend into a limiting channel along with the rising of the first lifting frame to be connected with the first limiting structure, and longitudinally withdraw out of the limiting channel along with the falling of the first lifting frame to be separated from the first limiting structure.

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