CN113983136A

CN113983136A - Safety mechanism for hoisting stand column and stand column comprising same

Info

Publication number: CN113983136A
Application number: CN202111385148.8A
Authority: CN
Inventors: 项乐宏; 蒋领辉; 陶闽泉; 李夏龙
Original assignee: Loctek Ergonomic Technology Co Ltd
Current assignee: Loctek Ergonomic Technology Co Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-01-28

Abstract

The invention discloses a safety mechanism for a vertical column for hoisting and a vertical column comprising the same, belonging to the technical field of lifting vertical columns and comprising the following steps: one side of the gearbox shell is fixedly connected with the connecting structure; one side of the gearbox shell, which is far away from the connecting structure, is fixedly connected with a gearbox fixing seat, the gearbox fixing seat is provided with a through hole, and the inner wall of the through hole radially protrudes out of a limiting block; one end of the transmission rod penetrates through the through hole of the gear box fixing seat to be in driving connection with the output end in the gear box shell; the side wall or the end part of the transmission rod is provided with a safety structure, and one side of the safety structure is abutted to the limiting block. This safety mechanism and the stand that contains it, after the drive gear of lead screw tip and lead screw throw off, the safety structure on the lead screw can continue the joint on the stopper of gear box fixing base, prevents the decline of lead screw and stand.

Description

Safety mechanism for hoisting stand column and stand column comprising same

Technical Field

The invention relates to the technical field of lifting columns, in particular to a safety mechanism for a lifting column and a column comprising the same.

Background

The existing wall-mounted cabinet or storage rack is generally fixedly arranged and used for placing or storing articles, the wall-mounted cabinet is generally arranged on a wall surface, difficulty and inconvenience can exist in the using process of the wall-mounted cabinet due to different self conditions of users in the using process, and the wall space cannot be reasonably utilized.

The prior art also discloses some lifting storage racks in lifting moving and height-adjustable hanging cabinets or lifting modes, generally adopts the following two modes, one mode is combined with a cabinet body through pulley and rope matching, the structure and the installation are more complex, and slight shaking can be generated due to the special structural mode in the lifting process; the other type is a form of combination of a linear driver and a cabinet body, namely a form of a lifting upright column, and the lifting upright column is generally used for supporting upward movement, such as a lifting table, an upgrading bed and the like, and has better pressure resistance, but when the lifting upright column is applied to a lifting use situation, due to poor tensile property, a connection structure between the end of an inner screw rod and the output end of a driving motor may have a risk of separation in a working process, and a safety hazard exists.

Disclosure of Invention

To the above-mentioned problem that exists among the prior art, aim at providing a safety mechanism for hoist and mount stand and contain its stand, after the drive gear of lead screw tip and lead screw throw off, the safety structure on the lead screw can continue the joint on the stopper of gear box fixing base, prevents the decline of lead screw and stand, avoids the stand in the use, and the lead screw breaks away from between from the gear box casing.

The specific technical scheme is as follows:

a safety mechanism for a hoisted column, comprising: gear box casing, gear box fixing base, lead screw and safety structure.

One side of the gearbox housing is fixedly connected with a connecting structure, the specific connecting structure is a welding sheet, the welding sheet is fixedly connected with a main body part of furniture, and the furniture is generally a hoisted cabinet or a storage rack and the like.

One side and gear box fixing base fixed connection that the gearbox casing deviates from connection structure, the gearbox casing is pressed from both sides and is established between connection structure and gear box fixing base, the through-hole that runs through is seted up to the gear box fixing base, the gear box casing is provided with the mounting hole towards one side of gear box fixing base, this through-hole is relative with the mounting hole, and the inner wall radial protrusion of through-hole has a stopper, general stopper is the continuous setting, its shape is the same with through-hole internal diameter shape, the stopper still can be for discontinuous setting in addition, specifically be the arch that is array form and arranges, be provided with the clearance between the two adjacent archs.

One end of the screw rod penetrates through the through hole of the gear box fixing seat to be connected with the output end in the gear box shell, the screw rod is driven to rotate through the output end in the gear box shell, and the structure is simple and compact.

The part that the lead screw is located the gear box fixing base is provided with at least one safety structure, safety structure and lead screw fixed connection, and safety structure and stopper looks butt, when this stand is in normal operating condition, lead screw and safety structure are in vertical arrangement state, safety structure is near the up end at the stopper, and then realize if the tip of lead screw and fastener throw off the back, safety structure can prevent that the lead screw from continuing to descend, through the cooperation of safety structure and stopper, the tip that makes the lead screw still is in the gear box casing, avoid the work of lead screw to become invalid.

Through with connection structure (soldering lug), gear box casing and gear box fixing base are connected as a whole, and then support the atress of whole lead screw subassembly through gear box casing and gear box fixing base, the partial cover that is located the gear box fixing base at the lead screw is equipped with the safety structure in addition, and this safety structure accepts through the stopper in the gear box fixing base, after transmission part breaks away from with the lead screw carelessly, still accessible safety structure butt is on the stopper of gear box fixing base, prevent that lead screw and stand from continuing the whereabouts, avoid the lead screw from the gear box casing, break away from in the gear box fixing base, the tensile strength of this stand has been promoted, the risk that breaks away from between lead screw tip and the driving motor output has been reduced, the potential safety hazard has been eliminated.

The safety mechanism for the vertical column for hoisting is further characterized in that the gear box shell is connected with the connecting structure through a fastener, and the gear box fixing seat is connected with the gear box shell through a fastener; or the fastener passes connection structure, gearbox casing and gear box fixing base and connects them as a whole, and then realizes fixing gear box and gear box fixing base monolithic on connection structure to support whole lead screw subassembly atress, pass connection structure, gearbox casing and gear box fixing base through same connecting piece, the installation connection form is comparatively simple, but reduction in production cost.

The safety mechanism for the vertical column for hoisting is characterized in that the safety structure is detachably connected with the screw rod, and the relative position of the installation between the safety structure and the screw rod can be adjusted in an adaptive manner, so that the safety mechanism is more flexible.

The safety mechanism for the vertical column for hoisting is characterized in that the safety structure is a safety nut, the safety nut is in threaded connection with the part, located in the gear box fixing seat, of the lead screw, the axial side of the safety nut is abutted to the limiting block, the structure is simple, the connection form between the safety nut and the lead screw is simple, and the axial tension borne by the safety nut and the lead screw is large.

The safety mechanism for the hoisting stand column is characterized in that the safety structure is a safety insertion block, the safety insertion block is inserted into the lead screw, one side, close to the limiting block, of the safety insertion block is abutted to the limiting block, the structure is simple, the connection form between the safety insertion block and the lead screw is relatively simple, the assembly efficiency is high, and the axial force borne by the safety insertion block or the safety insertion block and the lead screw depends on the number of pins between the safety insertion block and the lead screw.

The safety mechanism for the vertical column for hoisting is characterized in that the safety structure is a safety step, the safety step and the screw rod are integrally arranged, the specific safety step and the screw rod are integrally formed, the manufacturing cost is relatively high, and the axial force borne by the safety step and the screw rod is the largest.

An upright post for hoisting mainly comprises a motor, the motor is connected with an input end in a gear box shell, the input end in the gear box shell is driven to rotate by the motor, the matching between the output end of the gear box shell and the screw rod is in the form of a bevel gear set, or the structure is compact, the through hole of the gear box fixing seat is internally provided with a step, the step bearing screw rod is connected with one end of the output end in the gear box shell, the gear box fixing seat also axially supports the screw rod through an independent step, so as to improve the axial supporting force of the screw rod in the hoisting process and the tensile property of the screw rod, and in addition, the screw rod is also provided with a screw rod nut which moves relative to the screw rod, the screw rod is connected with one sleeve, the screw rod nut is connected with the other sleeve, and the stretching between the two sleeves is realized through the relative movement between the screw rod and the screw rod nut.

The upright post for hoisting is characterized in that a transmission part is arranged on the part, located on the gearbox shell, of the screw rod, the transmission part is matched with the output end of the gearbox fixing seat, the transmission part can be a bevel gear, a worm wheel or a worm, and can be selected according to actual conditions, and the transmission part is borne by the step.

The upright post for hoisting is also characterized in that the transmission component is fixedly connected with the screw rod through a fastener, the fastener is a screw generally, the screw can fix the end part of the screw rod in the gearbox fixing seat, and meanwhile, the screw can fix the transmission component at the end part of the screw rod; or the transmission part is fixedly connected with the screw rod through spin riveting, so that the installation is simple, the bearing capacity of the transmission part can be increased, and the risk of the screw rod breaking away from the gear box fixing seat is reduced.

The stand column for hoisting is characterized in that a first bearing is arranged on one side of the transmission part and used for radially supporting the screw rod, a gap is reserved between the first bearing and the safety structure, the safety structure is prevented from being jacked to the first bearing due to machining errors, the center distance between the transmission gear and the output shaft is further changed, the gear is not meshed smoothly, the first bearing and the transmission part are simultaneously borne by the step, the transmission part is fixedly connected with the screw rod, one side of the transmission part is contacted with the first bearing, and therefore the axial tensile force of the screw rod can be resisted by the transmission part and the first bearing.

The stand column for hoisting further has the characteristic that one side, deviating from the safety structure, of the limiting block is provided with the second bearing, the second bearing is sleeved on the side wall of the screw rod, the screw rod jacking ring is arranged between the second bearing and the screw rod, and the screw rod jacking ring is mainly arranged to ensure concentricity among the screw rod, the second bearing and the transmission part to achieve the aligning effect. In addition, the second bearing axially supports the screw rod and assists the screw rod to rotate.

The utility model provides an foretell stand for hoist and mount, such characteristic still has, still include the torsional spring subassembly, the torsional spring subassembly includes the spacing seat of torsional spring, torsional spring seat and torsional spring, the spacing seat of torsional spring is connected with the gear box fixing base, the protruding looks butt of lateral wall of torsional spring seat and lead screw, the both ends of torsional spring respectively with the spacing seat of torsional spring, torsional spring seat looks butt, come to apply one to the gear box fixing base through the torsional spring and follow the power of lead screw towards the gear box direction, and then support gear box fixing base and gear box casing, specific work as under the stand heavy load, provide certain self-locking power through the torsional spring subassembly, prevent that the stand from leading to stand and cabinet body whole decline after bearing by a wide margin. In addition, when the stand was in under great load state, the stand can have certain decline inertia at the in-process that descends, can make the motor drive gear can not follow up the normal operating between the gear, leads to the stand to beat the tooth phenomenon in the in-process that descends can appear, and this torsional spring subassembly can play certain buffering brake effect, reduces the inertia in the decline.

The positive effects of the technical scheme are as follows:

the invention provides a safety mechanism for a hoisting upright post and the upright post comprising the same,

1. the connecting structure (the welding sheet), the gearbox shell and the gearbox fixing seat are connected into a whole, so that the stress of the whole screw rod assembly is supported;

2. the connecting structure (the welding sheet), the gear box shell and the gear box fixing seat are connected by the same fastener, so that the assembly is simple, the production and assembly efficiency can be improved, in addition, the number of the openings is reduced as much as possible, the structural strength is improved, and the support for the screw rod is improved;

3. the side wall of the screw rod is sleeved with a safety structure, the safety structure is connected through a limiting block in the gear box fixing seat in a bearing mode, when the transmission gear is accidentally separated from the screw rod, the safety structure can still be abutted against the limiting block of the gear box fixing seat to prevent the stand column and the screw rod from continuously falling, the screw rod is prevented from being separated from the gear box shell and the gear box fixing seat, and the safety of the hoisted furniture in the using process is guaranteed;

4. meanwhile, the arrangement of the safety structure can improve the supporting force of the screw rod in the axial direction of the screw rod so as to increase the load bearing of the upright post and the hoisting furniture;

5. a torsion spring assembly is arranged on one side of the gear box fixing seat, which is far away from the gear box shell, when the stand column is under a heavy load condition, a certain self-locking force is provided through the torsion spring assembly, and the stand column and the cabinet body are prevented from integrally descending after the stand column bears a large load; in addition, when the stand column is under the condition of larger load, the stand column has larger descending inertia in the descending process, so that the gear beating phenomenon occurs in the running process between the gears, and the torsion spring assembly can play a role in buffering and braking, so that the inertia in the descending process is reduced.

Drawings

Fig. 1 is a first structural schematic diagram of a safety mechanism for a hoisting upright column and an upright column comprising the safety mechanism for a hoisting upright column according to the invention;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a schematic view of a safety mechanism for a hoisted column and a column incorporating the same, with an outer casing removed, according to the present invention;

fig. 4 is a structural schematic diagram of a safety mechanism for a hoisted upright column and an upright column comprising the safety mechanism;

fig. 5 is a cross-sectional view at B-B in fig. 4.

1. A connecting structure; 2. a fastener; 3. a gearbox housing; 4. a gear box fixing seat; 5. an output end; 6. a screw; 7. a transmission member; 8. a first bearing; 9. a safety structure; 10. a limiting block; 11. a second bearing; 12. a screw rod; 13. a feed screw nut; 14. a torsion spring limiting seat; 15. a torsion spring; 16. a torsion spring seat;

100. a column; 200. an electric motor.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the efficacy of the invention easy to understand, the following embodiment is specifically described with reference to fig. 1 to 5 for a safety mechanism of a vertical column for hoisting and a vertical column comprising the same.

The numbering of the components themselves, such as "first", "second", etc., is used herein only to distinguish between the objects depicted and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In this safety mechanism for upright 100 of hoist and mount, refer to fig. 2 specifically, one side and the connection structure 1 fixed connection of gear box casing 3, generally adopt threaded fastener 2 to carry out fixed connection, also can adopt other fixed connection's form, for example welding, riveting etc., specific connection structure 1 is the welding piece, this welding piece and the main part fixed connection of furniture, furniture generally is cupboard or the support etc. of hoist and mount, the gear box is for hoisting on the main part of furniture promptly, and then guarantee the installation stability of hoisting the last gearbox of furniture, can promote the assembly precision between the output shaft of motor 200 and the gear box gear in the gear box casing 3 simultaneously.

One side that gear box casing 3 deviates from

connection structure

1 and 4 fixed connection of gear box fixing base, generally adopt threaded fastener 2 to carry out fixed connection, also can adopt other fixed connection's form, gear box casing 3 is pressed from both sides and is established between connection structure 1 and gear box fixing base 4, gear box fixing base 4 has seted up the through-hole that runs through, gear box casing 3 is provided with the mounting hole towards one side of gear box fixing base 4, this through-hole is relative with the mounting hole, and the inner wall radial protrusion of through-hole has stopper 10, general stopper 10 is continuous setting, its shape is the same with through-hole internal diameter shape, stopper 10 still can be discontinuous setting in addition, specifically be the arch of array form arrangement, specific this stopper 10 is as the support of safety structure 9.

One end of the screw rod 12 penetrates through a through hole of the gear box fixing seat 4 to be in driving connection with an output end in the gear box shell 3, and the output end in the gear box shell 3 drives the screw rod 12 to rotate, so that the power transmission direction is changed.

The lateral wall or the tip of lead screw 12 are provided with at least one safety structure 9, safety structure 9 and lead screw 12 fixed connection, safety structure 9 and synchronous rotation of lead screw 12, and safety structure 9 and stopper 10 looks butt, it specifically is that the lower terminal surface of safety structure 9 and the up end of stopper 10 are leaned on, the axial position of safety structure 9 is injectd through stopper 10 of gear box fixing base 4, when this stand 100 is in normal operating condition, lead screw 12 and safety structure 9 are in vertical arrangement state, safety structure 9 is near the up end at stopper 10, if the tip of lead screw 12 is thrown away from the back with the fastener, because gear box fixing base 4, gear box casing 3 and welding piece are connected as a whole, safety structure 9 can prevent that lead screw 12 from continuing to descend.

Be provided with two and above safety structure 9 when the lateral wall or the tip of lead screw 12, the inner wall of gear box casing 3 and/or gear box fixing base 4 is provided with the stopper 10 that corresponds quantity, safety structure 9 supports with the stopper 10 that corresponds the position and leans on, and gear box casing 3 and/or gear box fixing base 4 and the welded joint on the cabinet body fixed connection, and then make the axial bearing capacity on the lead screw 12 shift to the welded joint, and then promote the load capacity on lead screw 12 and the whole stand 100, through setting up a plurality of safety structure 9, provide multiple safety guarantee for preventing breaking away from between lead screw 12 and the gear box fixing base 4.

Regarding the connection form of the welding tabs, the gearbox housing 3 and the gearbox fixing 4, in one embodiment, the gearbox housing 3 is connected with the connection structure 1 by the fasteners 2 alone, and the gearbox fixing 4 is connected with the gearbox housing 3 by the fasteners 2 alone.

In another preferred embodiment, referring to fig. 2 in particular, the same fastener 2 sequentially penetrates through the connecting structure 1, the gearbox housing 3 and the gearbox fixing seat 4 to connect the three into a whole, so that the gearbox housing 3 and the gearbox fixing seat 4 are integrally fixed on the connecting structure 1 to support the whole screw rod 12 assembly to bear force, and the connecting mode is simpler.

Further, fastener 2 successively passes welding lug, gear box casing 3 and gear box fixing base 4 in proper order, or fastener 2 successively passes gear box fixing base 4, gear box casing 3 and welding lug in proper order.

Further, the fastening member 2 is generally a screw or a bolt, which can be used alone or in combination with a nut.

To the setting form of the safety structure 9, in an embodiment, specifically referring to fig. 2 and fig. 4, the safety structure 9 is a safety nut, the safety nut is connected with the side wall or the end of the lead screw 12 through a thread, and one axial side of the safety nut is abutted to the limit block 10, under a normal working state, the vertical downward stress on the lead screw 12 is transmitted to the gear box fixing seat 4 through the safety nut, the structure is simple, the connection form between the safety nut and the lead screw 12 is simple, and the axial tension borne by the safety nut and the lead screw 12 is large.

In another embodiment, the safety structure 9 is a safety plug, which is inserted into the screw rod 12, and one side of the safety insertion block close to the limiting block 10 is abutted against the limiting block 10, and the safety insertion block mainly comprises two forms, namely, in the first form, a through hole is arranged on the side wall of the screw rod 12, the safety insertion block directly penetrates through the through hole in a strip shape, and the two ends of the safety plug block are respectively propped against the limit block 10, in the second form, through holes with corresponding positions are respectively arranged on the screw rod 12 and the safety plug block, the through holes on the screw rod 12 and the safety plug block are aligned and are penetrated with pins, thereby fixing the position between the screw rod 12 and the safety insertion block, the safety insertion block is propped against the limit block 10, the structure has simple installation, relatively simple connection form between the safety insert block and the screw rod 12 and higher assembly efficiency, and the axial force which can be borne by the two is determined by the number of the adopted safety insert blocks or the pins between the safety insert blocks and the screw rod 12.

Furthermore, pin holes with opposite positions are formed in the safety insert block and the screw rod 12, and the pin penetrates through the pin holes to limit the relative positions of the safety insert block and the screw rod 12 in the axial direction.

In another kind of embodiment, safety structure 9 is the safety step, and safety step and lead screw 12 formula as an organic whole set up, and specific safety step 9 and lead screw 12 both are integrated into one piece, and the axial one side of safety step and stopper looks 10 butt, and under normal operating condition, vertical decurrent atress on the lead screw 12 is transmitted to gear box fixing base 4 through the safety step on the lead screw 12, and manufacturing cost is higher relatively, but the axial force that both can bear is the biggest.

In the column 100 including the above-mentioned safety mechanism, as can be seen from fig. 1 to 5, the column 100 is generally used for lifting electric furniture under a hoisting condition, the safety mechanism is disposed inside the column 100, the end of the screw rod 12 extending into the gear box housing 3 is provided with the transmission part 7, the transmission part 7 is in driving connection with the output end in the gear box housing 3, the output shaft of the motor 200 is in driving connection with the output end in the gear box housing 3, the transmission part 7 is in bevel gear fit with the output end of the gear box housing 3, the structure is compact, or the transmission part 7 is in worm gear fit with the output end of the gear box housing 3, a step is disposed in the through hole of the gear box fixing seat 4, the step bearing screw rod 12 is connected with one end of the output end in the gear box housing 3, the gear box fixing seat 4 further axially supports the screw rod 12 through an independent step, in addition, a screw rod nut 13 matched with the screw rod 12 is further arranged on the screw rod 12, relative movement can be achieved between the screw rod nut 13 and the screw rod 12, the specific screw rod 12 is connected with one of the sleeves, the screw rod nut 13 is connected with the other sleeve, stretching between the two sleeves is achieved through the relative movement between the screw rod 12 and the screw rod nut 13, and then lifting of the hoisting electric furniture is achieved.

In one embodiment, as shown in fig. 2, 3 and 5, the transmission member 7 is mounted to the screw rod 12 through a fastener, the transmission member 7 and the screw rod 12 are coaxially arranged, and the rotation of the transmission member 7 drives the screw rod 12 to rotate, so that the structure is simple and the assembly is convenient. In addition, the transmission part 7 is supported by the step, and because the transmission part 7 is fixedly connected with the screw rod 12, the tensile force in the axial direction of the screw rod 12 can be resisted by supporting the transmission part 7.

Furthermore, the transmission component 7 is a bevel gear, the middle aperture of the bevel gear is larger than the diameter of the end part of the screw rod 12, the bevel gear is sleeved on the screw rod 12, the end part of the screw rod 12 is provided with a threaded mounting hole, and the bevel gear is mounted in the threaded mounting hole through a screw 6 so as to be fixed at the end part of the screw rod 12.

Furthermore, the transmission component 7 is a bevel gear, and the bevel gear is fixedly connected with the screw rod 12 in a spin riveting mode, so that the axial supporting force of the bevel gear can be improved, and the bevel gear and the screw rod 12 can be prevented from being separated from each other.

In an embodiment, the first bearing 8 is further included, as shown in fig. 2, 3 and 5, the first bearing 8 is disposed on one side of the transmission component 7, a deep groove ball bearing may be used as the specific first bearing 8, and a gap is left between the first bearing 8 and the safety structure 9, so that it is avoided that the safety structure 9 is pushed against the first bearing 8 due to a machining error, so that a center distance between the transmission component 7 and the output shaft is changed, and gear meshing is not smooth. And the step simultaneously bears the first bearing 8 and the transmission part 7, and because the transmission part 7 is fixedly connected with the screw rod 12, and one side of the transmission part 7 is contacted with the first bearing 8, the tensile force in the axial direction of the screw rod 12 can be resisted by bearing the transmission part 7 and the first bearing 8.

Further, the first bearing 8 also axially supports the screw rod 12 to assist the screw rod 12 to rotate.

In an embodiment, the safety structure further includes a second bearing 11, as shown in fig. 2 and 5, the second bearing 11 is disposed on one side of the limit block 10 away from the safety structure 9, the second bearing 11 may be a deep groove ball bearing, the second bearing 11 is sleeved on a side wall of the lead screw 12, and a lead screw top ring is disposed between the second bearing 11 and the lead screw 12, wherein the lead screw top ring is disposed mainly for ensuring concentricity between the lead screw 12, the second bearing 11 and the transmission component 7, so as to achieve a function of aligning. In addition, the second bearing 11 axially supports the screw 12 to assist the screw in rotating.

Further, one side that gear box fixing base 4 deviates from gear box casing 3 is provided with spacing seat, and spacing seat is connected through the fastener with gear box fixing base 4, and the axial position of second bearing is injectd through the cooperation of stopper 10 and spacing seat.

In one embodiment, the gearbox fixing seat further comprises a torsion spring assembly, as shown in fig. 2, 3 and 5, the torsion spring assembly is disposed below the gearbox fixing seat 4, the torsion spring assembly comprises a torsion spring limiting seat 14, a torsion spring seat 16 and a torsion spring 15, the torsion spring limiting seat 14 is connected with the gearbox fixing seat 4, specifically, the torsion spring limiting seat 14 is connected with the gearbox fixing seat 4 through a threaded fastener, the torsion spring seat 16 abuts against a side wall protrusion of the lead screw 12, two ends of the torsion spring 15 abut against the torsion spring limiting seat 14 and the torsion spring seat 16 respectively, a force is applied to the gearbox fixing seat 4 along the screw rod 12 towards the gearbox through the torsion spring 15, thereby supporting the gearbox fixing seat 4 and the gearbox shell 3, further when the upright 100 is under large load-bearing load, the torsion spring assembly provides certain self-locking force, and the stand 100 is prevented from being lowered integrally after being greatly loaded. In addition, when stand 100 is in under the great load state, certain decline inertia can exist at the in-process that descends in stand 100, can make the drive that motor 200 drove the gear can not keep up with the normal operating between the gear, leads to the tooth phenomenon can appear beating in the in-process that descends in stand 100, and this torsional spring subassembly can play certain buffering brake effect, reduces the inertia in the decline, and then guarantees the steady operation of stand 100 in the in-process that descends.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. A safety mechanism for hoisted columns, comprising:

one side of the gearbox shell is fixedly connected with the connecting structure;

the side, away from the connecting structure, of the gearbox shell is fixedly connected with the gearbox fixing seat, the gearbox fixing seat is provided with a through hole, and the inner wall of the through hole radially protrudes out of a limiting block;

one end of the screw rod penetrates through the through hole of the gear box fixing seat to be connected with the output end in the gear box shell, and the output end in the gear box shell drives the screw rod to rotate;

the part of the screw rod, which is positioned in the gear box fixing seat, is provided with at least one safety structure, and the safety structure is abutted to the limiting block.

2. The safety mechanism for the hoisted column according to claim 1, wherein the gearbox housing is connected with the connecting structure through a fastener, and the gearbox fixing seat is connected with the gearbox housing through a fastener; or the fastener passes through the connecting structure, the gearbox shell and the gearbox fixing seat to connect the connecting structure, the gearbox shell and the gearbox fixing seat into a whole.

3. The safety mechanism for a column for lifting of claim 1, wherein the safety mechanism is detachably connected to the screw rod.

4. The safety mechanism for the vertical column for hoisting according to claim 1 or 2, wherein the safety structure is a safety nut, the safety nut is in threaded connection with a part of the screw rod located in the gear box fixing seat, and the safety nut abuts against the limiting block.

5. The safety mechanism for the hoisted stand column according to claim 1 or 2, characterized in that the safety structure is a safety plug, the safety plug is inserted into the screw rod, and the safety plug abuts against the limit block.

6. An upright post for hoisting, comprising the safety mechanism of any one of the preceding claims 1 to 5, characterized by comprising a motor, wherein the motor is connected with an input end in the gear box housing, the motor drives the input end in the gear box housing to rotate, a step is arranged in the through hole of the gear box fixing seat, the step bears one end of the screw rod connected with an output end in the gear box housing, in addition, a screw nut which moves relative to the screw rod is further arranged on the screw rod, wherein the screw rod is connected with one sleeve, and the screw nut is connected with the other sleeve.

7. The upright post for hoisting according to claim 6, wherein the part of the screw rod positioned on the gearbox shell is provided with a transmission part, the transmission part is matched with the output end of the gearbox fixing seat, and the step bears the transmission part.

8. The upright post for hoisting according to claim 7, wherein the transmission component is fixedly connected with the screw rod through a fastener; or the transmission part is fixedly connected with the screw rod through spin riveting.

9. The upright post for hoisting according to claim 7, wherein a first bearing is arranged at one side of the transmission part, a gap is left between the first bearing and the safety structure, and the step bears the first bearing and the transmission part.

10. The stand column for hoisting according to claim 6, wherein a second bearing is arranged on one side of the limiting block, which is away from the safety structure, the second bearing is sleeved on a side wall of the screw rod, and a screw rod top ring is arranged between the second bearing and the screw rod.