CN219422422U - Double-screw driven lifting device - Google Patents

Abstract

The utility model belongs to the technical field of lifting devices, and particularly relates to a double-screw transmission lifting device, which comprises a first pipe body, a second pipe body, a first linear screw rod and a second linear screw rod; the first linear screw rod penetrates through the first pipe cavity, a first screw rod nut is connected to the first linear screw rod in a matched mode, a limiting table is arranged on the cavity wall at the opening of one end of the first pipe cavity, a bearing and the first screw rod nut are sequentially arranged at the opening of one end of the first pipe cavity, one end periphery of the bearing is abutted to the limiting table, the other end of the bearing is abutted to the first screw rod nut, and the first screw rod nut is fixedly connected with the first pipe body in a riveting mode. The bearing is tightly pressed and fixed between the limiting table and the first screw nut, the installation is firm, the bearing is not required to be fixed in the first screw nut or the first pipe cavity of the first pipe body by adopting accessories such as a clamping ring or a screw, the accessories are reduced, the structure is simple, the assembly is convenient, the assembly precision is high, and the faults are few. The tooth-shaped piece and the first linear screw rod adopt an integrated structure, so that the tooth-shaped piece is firm in structure and not easy to fall off.

Description

Double-screw driven lifting device

Technical Field

The utility model belongs to the technical field of lifting devices, and particularly relates to a double-screw transmission lifting device.

Background

At present, most of telescopic pipes or telescopic rods used in electric lifting tables are of three-section lifting structures, and the specific structure of the telescopic pipes or telescopic rods comprises an inner pipe, a middle pipe and an outer pipe, wherein the rear end of the inner pipe is inserted into the middle pipe, the rear end of the middle pipe is inserted into the outer pipe, a double-screw structure is arranged in the middle pipe, and then a motor drives screws of the double-screw structure to rotate so as to drive the inner pipe and the outer pipe to stretch out and draw back at two opposite ends of the middle pipe.

For example: chinese patent application number CN201380021352.9 discloses a lifting column comprising: a guide having three parts (1, 2, 3) nested inside each other; and a motor driven spindle unit for producing the movement. The second part (2) of the guide is fixed by the lower end to the lower end of the second spindle (6). A second spindle nut (8) cooperating with the second spindle (6) is fixed by means of a bearing (18) with a rigid connection (28) to a stub shaft (16) which is fixed to the upper end of the drive tube (9). The stub shaft (16) is fixed to a mounting plate (23) by a second bearing (20), and the spindle unit is fixed to the lifting column by the mounting plate. Thus, the vertical load on the lifting column is guided through the spindle unit around the guides (1, 2, 3). This enables better and more suitable dimensions of the guides (1, 2, 3) and the spindle unit, as it facilitates assembly, in particular extrusion protection in the lifting column. Further, referring to the description of the specification, "the second member 2 has an end piece-shaped connector 11 at the lower end thereof. In the connecting piece 11 there is a through opening 12. The first spindle nut 7 is held by its outer edge 13 in an annular groove 14 of the opening 12. For this purpose, the connecting piece 11 is formed in two halves, which are positioned around the outer edge 13 of the first spindle nut 7 by means of the annular groove 14. The connection 11 is fixed at the end of the second part 2 by means of a snap-lock connection or screw. This will help to hold the two halves together when the connection 11 is fixed at the end of the second part 2, or the second part 2 of the guide is connected to the second spindle 6 by the connection 11, and the spindle nut 8 on the second spindle 6 is fixed to the first bearing 18 by a rigid connection in the shape of a tube 28. A bushing 29 having an annular groove 30 is mounted at the upper end of the tube 28 for receiving the bearing 18 on its outer side. The bushing is two pieces and fits around the bearing 18 through an annular groove 30 and is held at the end of the tube 28 by a snap lock connection or screw.

From the above, during installation, the first spindle nut 7 (screw nut) is firstly installed in the opening 12 of the connecting piece 11, then the connecting piece 11 is fixed at the end part of the second component 2 through the fastening locking connecting piece or the screw, and the first spindle nut 7 (screw nut) is fixedly installed through the connecting piece 11 and the fastening locking connecting piece or the screw, so that the structural fittings are too many, more fasteners are relied between the fittings, the assembly is slow, and the failure is easy to occur during the lifting movement. The spindle nut 8 on the second spindle 6 is fixed to the first bearing 18, fitted around the bearing 18 by the annular groove 30, and held at the end of the tube 28 by a snap lock connector or screw, and it is found that the above-mentioned bearing 18 is fixed by a snap ring, a snap lock connector or screw, and is liable to come loose, too many in fittings, slow in fitting, and liable to malfunction.

Disclosure of Invention

The utility model aims to provide a double-screw driven lifting device, which aims to solve the technical problems that in the prior art, a bearing of the lifting device is fixed by a clamping ring, a buckle locking connecting piece or a screw, loose easily occurs, accessories are too many, assembly is slow, and faults easily occur.

In order to achieve the above purpose, the lifting device with double screw transmission provided by the embodiment of the utility model comprises a first pipe body, a first linear screw rod and a second linear screw rod; the first pipe body is provided with a first pipe cavity penetrating through two ends of the first pipe body, the first linear screw rod penetrates through the first pipe cavity from an opening at one end of the first pipe body, and a first screw rod nut is connected to the first linear screw rod in a matched mode; a limiting table is arranged on the cavity wall at the opening of one end of the first pipe cavity, a bearing and the first screw nut are sequentially arranged at the opening of one end of the first pipe cavity, the periphery of one end of the bearing is abutted to the limiting table, the other end of the bearing is abutted to the first screw nut, and the first screw nut is fixedly connected with the first pipe body in a riveting manner; the second linear screw rod is rotationally connected to the bearing, the second linear screw rod is provided with an inner cavity, the cavity wall of the inner cavity is provided with at least one sliding groove along the length direction of the inner cavity, and the first linear screw rod penetrates through the inner cavity and is slidably connected to the sliding groove at the end part of the first linear screw rod through a connecting piece.

Optionally, a mounting groove is formed at one end, close to the bearing, of the first screw nut, and the bearing is adaptively mounted in the mounting groove.

Optionally, the connecting piece and the first linear screw rod form an integrated structure through injection molding.

Optionally, the cavity wall of the inner cavity is annularly and uniformly distributed with a plurality of sliding grooves along the length direction of the inner cavity, the connecting piece is a tooth-shaped piece, and a plurality of teeth of the tooth-shaped piece are respectively and slidably connected with the sliding grooves one by one.

Optionally, one end of the second linear screw rod is reduced in diameter to form a connecting shaft, and the connecting shaft is inserted into a bearing hole of the bearing; and a limiting block is arranged at the end part of the connecting shaft in an outward extending mode and is abutted with the end wall of the bearing.

Optionally, a plurality of first clamping grooves are annularly and uniformly distributed on the outer wall of the first screw nut, a plurality of first riveting clamping bulges are formed on the inner wall of the first pipe cavity through riveting, and a plurality of first riveting clamping bulges are respectively clamped in a plurality of first clamping grooves one by one.

Optionally, the device further comprises a second pipe body; the second pipe body is provided with a second pipe cavity, the second pipe body penetrates through the first pipe cavity from the opening at the other end of the first pipe body and is sleeved outside the second linear screw rod, a second screw rod nut is connected to the second linear screw rod in a matched mode, and the second screw rod nut is inserted into the second pipe cavity in a plugging mode.

Optionally, a plurality of second clamping grooves are annularly and uniformly distributed on the outer wall of the second screw nut, a plurality of second riveting clamping protrusions are formed on the inner wall of the second pipe cavity through riveting, and the second riveting clamping protrusions are respectively clamped in the second clamping grooves one by one.

Optionally, the size of one end of the second screw nut is increased to form a limiting part, the second screw nut is inserted into the second pipe cavity from an opening at one end of the second pipe body, and the limiting part is abutted with the end wall of the second pipe body.

Optionally, an end of the first linear screw extending out of the first lumen is provided with a mounting piece, and the mounting piece is used for being connected with a driving piece.

Compared with the prior art, the one or more technical schemes in the double-screw transmission lifting device provided by the embodiment of the utility model have at least one of the following technical effects:

1. when the assembly is carried out, the bearing is firstly arranged in the first pipe cavity and is abutted with the limiting table, the first screw rod nut is arranged in the first pipe cavity and is fixedly connected with the first pipe body in a riveting mode, so that the bearing is tightly pressed and fixed between the limiting table and the first screw rod nut, the installation is firm, the bearing is not required to be fixed in the first pipe cavity of the first screw rod nut or the first pipe body by adopting accessories such as a clamping ring or a screw, the number of accessories (parts) is reduced, the structure is simple, the assembly is convenient, the assembly precision is high, and the fault is few.

2. Compared with the prior art, the spline tooth part and the first linear screw rod are easy to slip or loose in a screw fixing mode, and the connecting piece (tooth part) and the first linear screw rod are of an integrated structure, so that the spline tooth part is firm in connection, difficult to fall off when stressed, and firm in structure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a twin-screw driving lifting device according to the present utility model.

Fig. 2 is a schematic view of another state of the twin-screw driving lifting device of the present utility model.

Fig. 3 is a top view of the twin screw drive elevator of the present utility model.

Fig. 4 is a cross-sectional view taken along line A-A in fig. 3.

Fig. 5 is a schematic view of the partial structure of fig. 4.

Fig. 6 is a sectional view taken along line B-B in fig. 3.

Fig. 7 is a sectional view taken along line C-C of fig. 3.

Fig. 8 is a partially exploded view of the twin-screw drive lifting device of the present utility model.

Fig. 9 is a schematic structural view of a first linear screw of the present utility model.

Wherein, each reference sign in the figure:

100. a first tube body; 110. a first lumen; 111. a limiting table; 120. the first riveting clamp is convex;

200. a second tube body; 210. a second lumen; 220. the second riveting clamp is convex;

300. a first linear screw rod; 310. a first lead screw nut; 311. a first clamping groove; 312. a mounting groove; 320. a connecting piece; 321. teeth; 330. a mounting member;

400. a second linear screw rod; 401. an inner cavity; 402. a chute; 410. a second lead screw nut; 411. a second clamping groove; 412. a limit part; 420. a bearing; 430. a connecting shaft; 431. and a limiting block.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to illustrate embodiments of the utility model and should not be construed as limiting the utility model.

In the description of the embodiments of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the embodiments of the present utility model and simplify 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.

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 one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

In one embodiment of the present utility model, referring to fig. 1 to 9, a twin-screw driven elevating device is provided, which includes a first pipe body 100, a second pipe body 200, a first linear screw 300, and a second linear screw 400.

Referring to fig. 4-8, the first tube 100 has a first lumen 110 penetrating through two ends thereof, the first linear screw 300 is disposed through the first lumen 110 from an opening at one end of the first tube 100, and a first screw nut 310 is cooperatively connected to the first linear screw 300.

Referring to fig. 4-8, a cavity wall at an opening of the first lumen 110 is provided with a limiting table 111, the bearing 420 and the first lead screw nut 310 are sequentially installed at the opening of the first lumen 110, a periphery of one end of the bearing 420 is abutted to the limiting table 111, the other end of the bearing 420 is abutted to the first lead screw nut 310, and the first lead screw nut 310 is fixedly connected with the first tube 100 in a riveting manner.

Referring to fig. 4-8, the second linear screw 400 is rotatably disposed in the first lumen 110, the second linear screw 400 has an inner cavity 401, at least one sliding groove 402 is disposed on a wall of the inner cavity 401 along a length direction of the inner cavity, and the first linear screw 300 is disposed through the inner cavity 401 and has an end portion slidably connected to the sliding groove 402 through a connecting member 320.

Compared with the prior art, the one or more technical schemes in the double-screw transmission lifting device provided by the embodiment of the utility model have at least one of the following technical effects:

referring to fig. 4-8, during assembly, the bearing 420 is placed into the first lumen 110 from an opening of the first lumen 110 to be abutted against the limiting table 111, and then the first lead screw nut 310 is placed into the first lumen 110 from an opening of the first lumen 110 to be fixedly riveted with the first tube body 100, so that the bearing 420 is firmly pressed and fixed between the limiting table 111 and the first lead screw nut 310, and the bearing 420 is not fixed in the first lead screw nut 310 or the first lumen 110 of the first tube body 100 by adopting fittings such as a snap ring or a screw, so that fittings (parts) are reduced, the structure is simple, the assembly is convenient, the assembly precision is high, and the faults are few.

Further, referring to fig. 5-8, an installation groove 312 is formed at one end of the first lead screw nut 310 near the bearing 420, the bearing 420 is adapted to be installed in the installation groove 312, and positioning and installation of the bearing 420 are facilitated during assembly.

In another embodiment of the present utility model, referring to fig. 4 and 8, the walls of the inner cavity 401 are uniformly distributed with a plurality of sliding grooves 402 along the length direction of the inner cavity, the connecting piece 320 is a tooth-shaped piece, and the teeth 321 of the tooth-shaped piece are respectively slidably connected to the plurality of sliding grooves 402, so that the first linear screw 300 is stably slidably connected to the inner cavity 401, and the second linear screw 400 can rotate along with the rotation of the first linear screw.

Further, referring to fig. 4 and 9, the connecting piece 320 forms an integral structure with the first linear screw 300 through injection molding, compared with the condition that the connecting piece (spline piece) and the first linear screw 300 are easy to slip or loose in a screw fixing manner in the prior art, the connecting piece 320 and the first linear screw 300 of the application adopt an integral structure, and are firm in connection, and are not easy to fall off when stressed, and are firm in structure.

In another embodiment of the present utility model, referring to fig. 4 and 5, one end of the second linear screw 400 is reduced in diameter to form a connection shaft 430, and the connection shaft 430 is inserted into a bearing hole of the bearing 420, so that the second linear screw 400 is stably rotatably connected to the bearing 420. The end of the connecting shaft 430 extends outward to form a stopper 431, the stopper 431 abuts against the end wall of the bearing 420, the stopper 431 plays a role in limiting, the bearing 420 is prevented from being separated from the connecting shaft 430, and the structure is stable.

In another embodiment of the present utility model, referring to fig. 6 to 8, a plurality of first clamping grooves 311 are uniformly distributed on the outer wall of the first lead screw nut 310 in an annular shape, and a plurality of first riveting clamping protrusions 120 are formed on the inner wall of the first pipe cavity 110 by riveting the outer wall of the first pipe body 100, and the plurality of first riveting clamping protrusions 120 are respectively clamped in the plurality of first clamping grooves 311 one by one.

Specifically, referring to fig. 6 to 8, the first riveting snap protrusion 120 is formed by riveting a designated position of an outer wall of the first pipe body 100 to inwardly deform the designated position of the first pipe body 100, so as to form the first riveting snap protrusion 120 located on an inner wall of the first pipe cavity 110, and the first riveting snap protrusion 120 is fixedly snapped into the first snap groove 311, and when assembling, the first lead screw nut 310 is inserted into one end of the first pipe cavity 110, and then the first riveting snap protrusion 120 is fixedly snapped into the first snap groove 311 by riveting the designated position of the outer wall of the first pipe body 100, so that compared with the fixing mode of adopting a screw or snap connector 320 in the prior art, the first riveting snap protrusion 310 is fixedly mounted in the first pipe cavity 110 of the first pipe body 100, thereby reducing fittings, having a simple structure and being convenient to assemble.

Specifically, referring to fig. 6 to 8, four first clamping grooves 311 are provided, four first clamping grooves 311 are respectively provided at four angular positions of the outer wall of the first screw nut 310, and correspondingly, four first riveting clamping protrusions 120 are provided.

In another embodiment of the present utility model, referring to fig. 4 to 8, the twin-screw driving elevating device further includes a second pipe body 200. The second pipe body 200 has a second pipe cavity 210, the second pipe body 200 is inserted into the first pipe cavity 110 from the opening at the other end of the first pipe body 100 and sleeved outside the second linear screw 400, a second screw nut 410 is connected to the second linear screw 400 in a matching manner, and the second screw nut 410 is inserted into the second pipe cavity 210 and fixedly connected with the second pipe body 200 in a riveting manner.

Specifically, referring to fig. 4 to 8, the first linear screw 300 is driven to rotate by a driving member, and the first linear screw 300 drives the second linear screw 400 to rotate and horizontally move relative to the second linear screw 400, so that the first linear screw 300 and the second pipe 200 stretch at opposite ends of the first pipe 100, thereby realizing lifting.

Further, referring to fig. 6-8, a plurality of second clamping slots 411 are uniformly distributed on the outer wall of the second screw nut 410 in an annular shape, and a plurality of second riveting clamping protrusions 220 are formed on the inner wall of the second pipe cavity 210 by riveting the outer wall of the second pipe body 200, and the plurality of second riveting clamping protrusions 220 are respectively clamped in the plurality of second clamping slots 411 one by one. Specifically, during assembly, the second lead screw nut 410 is inserted into one end of the second pipe cavity 210, and then the second riveting clamp protrusion 220 is fixedly clamped in the second clamping slot 411 by riveting the designated position of the outer wall of the second pipe body 200, so that the second lead screw nut 410 is fixedly installed in the second pipe cavity 210 of the second pipe body 200.

Specifically, referring to fig. 6-8, four second clamping slots 411 are provided, and four second clamping slots 411 are respectively provided at four corner positions of the outer wall of the second screw nut 410, and correspondingly, four second riveting clamping protrusions 220 are provided.

Further, referring to fig. 5-8, the size of one end of the second lead screw nut 410 is increased to form a limiting portion 412, the second lead screw nut 410 is inserted into the second pipe cavity 210 from an opening at one end of the second pipe body 200, and the limiting portion 412 abuts against an end wall of the second pipe body 200, so that the second lead screw nut 410 is positioned and installed in the second pipe cavity 210 of the second pipe body 200, and the second riveting clamping protrusion 220 can be accurately clamped in the second clamping slot 411 during riveting.

In another embodiment of the present utility model, referring to fig. 1-3, a mounting member 330 is disposed at an end of the first linear screw 300 extending out of the first lumen 110, and the mounting member 330 is configured to be connected to a driving member (not shown). The driving member may be a motor or a rotary cylinder, and drives the first linear screw 300 to rotate through the driving member, so that the structure is simple.

The rest of the present embodiment is the same as the first embodiment, and the unexplained features in the present embodiment are all explained by the first embodiment, and are not described here again.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. For those skilled in the art, the architecture of the utility model can be flexible and changeable without departing from the concept of the utility model, and serial products can be derived. But a few simple derivatives or substitutions should be construed as falling within the scope of the utility model as defined by the appended claims.

Claims (10)

1. The double-screw transmission lifting device is characterized by comprising a first pipe body, a first linear screw rod and a second linear screw rod; the first pipe body is provided with a first pipe cavity penetrating through two ends of the first pipe body, the first linear screw rod penetrates through the first pipe cavity from an opening at one end of the first pipe body, and a first screw rod nut is connected to the first linear screw rod in a matched mode; a limiting table is arranged on the cavity wall at the opening of one end of the first pipe cavity, a bearing and the first screw nut are sequentially arranged at the opening of one end of the first pipe cavity, the periphery of one end of the bearing is abutted to the limiting table, the other end of the bearing is abutted to the first screw nut, and the first screw nut is fixedly connected with the first pipe body in a riveting manner; the second linear screw rod is rotationally connected to the bearing, the second linear screw rod is provided with an inner cavity, the cavity wall of the inner cavity is provided with at least one sliding groove along the length direction of the inner cavity, and the first linear screw rod penetrates through the inner cavity and is slidably connected to the sliding groove at the end part of the first linear screw rod through a connecting piece.

2. The twin-screw driven lifting device as defined in claim 1, wherein: the first screw nut is close to one end of the bearing and is provided with a mounting groove, and the bearing is adaptively mounted in the mounting groove.

3. The twin-screw driven lifting device as defined in claim 1, wherein: the connecting piece and the first linear screw rod form an integrated structure through injection molding.

4. The twin-screw driven lifting device as defined in claim 1, wherein: the inner cavity is characterized in that a plurality of sliding grooves are annularly and uniformly distributed on the cavity wall of the inner cavity along the length direction of the inner cavity, the connecting piece is a tooth-shaped piece, and a plurality of teeth of the tooth-shaped piece are respectively and slidably connected with the sliding grooves one by one.

5. The twin-screw driven lifting device as defined in any one of claims 1-4, wherein: one end of the second linear screw rod is reduced in diameter to form a connecting shaft, and the connecting shaft is inserted into a bearing hole of the bearing; and a limiting block is arranged at the end part of the connecting shaft in an outward extending mode and is abutted with the end wall of the bearing.

6. The twin-screw driven lifting device as defined in any one of claims 1-4, wherein: the outer wall of the first screw nut is annularly and uniformly provided with a plurality of first clamping grooves, the outer wall of the first pipe body is riveted on the inner wall of the first pipe cavity to form a plurality of first riveting clamping protrusions, and the first riveting clamping protrusions are respectively clamped in the first clamping grooves one by one.

7. The twin-screw driven lifting device as defined in any one of claims 1-4, wherein: the pipe also comprises a second pipe body; the second pipe body is provided with a second pipe cavity, the second pipe body penetrates through the first pipe cavity from the opening at the other end of the first pipe body and is sleeved outside the second linear screw rod, a second screw rod nut is connected to the second linear screw rod in a matched mode, and the second screw rod nut is inserted into the second pipe cavity in a plugging mode.

8. The twin-screw driven lifting device as defined in claim 7, wherein: the outer wall of the second screw nut is annularly and uniformly provided with a plurality of second clamping grooves, the outer wall of the second pipe body is riveted on the inner wall of the second pipe cavity to form a plurality of second riveting clamping protrusions, and the second riveting clamping protrusions are respectively clamped in the second clamping grooves one by one.

9. The twin-screw driven lifting device as defined in claim 7, wherein: the size of one end of the second screw nut is increased to form a limiting part, the second screw nut is inserted into the second pipe cavity from an opening at one end of the second pipe body, and the limiting part is abutted with the end wall of the second pipe body.

10. The twin-screw driven lifting device as defined in any one of claims 1-4, wherein: one end of the first linear screw rod extending out of the first pipe cavity is provided with an installation piece, and the installation piece is used for being connected with a driving piece.