CN111938302A

CN111938302A - Lifting device

Info

Publication number: CN111938302A
Application number: CN202010949008.8A
Authority: CN
Inventors: 刘学峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-11-17

Abstract

The invention discloses a lifting device, comprising: a base; the telescopic rod is arranged on the base and at least comprises a first pipe body, a second pipe body and a third pipe body which are sleeved from outside to inside in a sliding manner, and the first pipe body, the second pipe body and the third pipe body are connected in a linkage manner through a linkage device; and a driving device capable of driving the second pipe body and the third pipe body to ascend simultaneously; the second tube body can be driven to ascend through the driving device, and the third tube body is connected with the second tube body through the linkage device, so that the third tube body ascends along with the second tube body, and the height of the dice tray can be greatly increased in use through superposition of the two tube bodies; meanwhile, the device is compact in structure, is directly installed in the installation groove of the mahjong table, does not need to install a protection box at the bottom of the mahjong table, and reduces occupation of the bottom space of the mahjong table.

Description

Lifting device

Technical Field

The invention belongs to the technical field of mechanical equipment, and particularly relates to a central lifting device of a dual-purpose full-automatic mahjong table for a dining table.

Background

The full-automatic mahjong machine used as a dining table is a high-grade life entertainment article, and has increasingly entered into families due to its applicability, comfort, health and fairness. The dual-purpose full-automatic mahjong machine for dining table is a relatively complex entertainment product because of integrating microcomputer control, electric control and mechanical transmission technology.

However, in the related art, a central lifting pipe is adopted in the dice tray central lifting mechanism of the automatic mahjong machine to be fixed with the dice tray, the lower end of the central lifting pipe is driven by the rocker arm to ascend or descend along the external guide rail, the external guide rail occupies the table bottom space, the lifting height of the lifting structure is limited, the distance for lifting the dice tray is short, the occupied area of the transmission structure is large, and the table bottom needs a lifting rod protection box to occupy the table bottom space, so that the table bottom space is small.

Disclosure of Invention

Therefore, the invention provides a lifting device of a mahjong table, and aims to solve the problems that in the prior art, the lifting height of a lifting structure is limited, external guide rails are needed at the table bottom, the lifting distance of a dice disk is short, the occupied area of a transmission structure is large, the table bottom needs external guide rails and a lifting rod protection box, the table bottom space is occupied, and the table bottom space is small.

In order to achieve the above purpose, the invention provides the following technical scheme: a lifting device, comprising: a base; the telescopic rod is arranged on the base and at least comprises a first pipe body, a second pipe body and a third pipe body which are sleeved from outside to inside in a sliding manner, and the first pipe body, the second pipe body and the third pipe body are connected in a linkage manner through a linkage device; and a driving device capable of driving the second pipe body to ascend relative to the first pipe body, and the third pipe body is capable of ascending simultaneously and synchronously relative to the second pipe body through a linkage device.

The second tube body can be driven to ascend through the driving device, the third tube body is connected with the second tube body through the linkage device, the third tube body ascends relative to the second tube body when the second tube body ascends relative to the first tube body, and the height of a dice tray arranged at the top of the third tube body can be greatly increased when the dice tray is used through the superposition of the ascending heights of the two tube bodies; meanwhile, the device is compact in structure, is directly installed in the installation groove of the mahjong table, does not occupy the table bottom space when being reset, does not need to install a protection box at the bottom of the mahjong table, and reduces the occupation of the bottom space of the mahjong table.

Further, the linkage includes: the first moving groove is arranged on the outer ring of the first pipe body, and a first rack is arranged at the bottom of the first moving groove; the second moving groove is arranged on the outer ring of the third pipe body, and a second rack is arranged at the bottom of the second moving groove; and the gear is rotatably arranged on the second pipe body, one side of the gear movably penetrates into the second pipe body, and the gear is simultaneously meshed with the first rack and the second rack.

Furthermore, a through hole for accommodating the gear to rotate is formed in the second pipe body.

Furthermore, a limiting piece is arranged on the outer ring of the second pipe body and penetrates through the second pipe body; the gear is rotatably sleeved on the limiting piece; the first pipe body is provided with a first limiting groove which is in sliding insertion connection with the limiting part, and the first limiting groove is axially arranged along the first pipe body.

Furthermore, a second limiting groove which is in sliding insertion connection with the limiting part is formed in the third pipe body, and the second limiting groove is axially arranged along the third pipe body.

Furthermore, the locating part comprises a rotating shaft, and the gear rotates and is sleeved on the rotating shaft.

Further, the driving device includes: a mounting seat; the bearing is rotatably connected to the second pipe body; one end of the crank is hinged with the mounting seat, and the other end of the crank is contacted with the bottom of the bearing; a motor; and the rocker arm, rocker arm one end connect in the motor output, the other end can contact with the crank, wherein, the motor output drives the rocker arm and rotates the in-process, can will through the rocker arm the crank is kept away from the one end of mount pad is lifted up.

Further, when the rocker arm rotates to the vertical state, the end part of the rocker arm, which is in contact with the crank, is just at the maximum bending point of the crank.

Further, the motor includes a stepping motor, a permanent magnet synchronous motor, and the like.

Furthermore, a resetting device is connected to the second pipe body.

The invention has the following advantages: the second tube body can be driven to ascend through the driving device, the third tube body is connected with the second tube body through the linkage device, the second tube body ascends relative to the first tube body, the third tube body also ascends relative to the second tube body, the height of a dice tray arranged at the top of the third tube body can be greatly increased when the dice tray is used through the superposition of the ascending heights of the two tube bodies, and all the tube bodies can be contracted into the first tube body when the dice tray is contracted, so that the space occupancy rate is reduced; therefore, the device has compact structure and small volume, is directly installed in the installation groove of the mahjong table, does not need to install a protection box at the bottom of the mahjong table, and reduces the occupation of the bottom space of the mahjong table.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a schematic view of an overall structure of a lifting device according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating an exploded structure of a tubular body of a lifting device according to an embodiment of the present invention;

fig. 3 is a rear view of a second tube of the lifting device according to an embodiment of the present invention;

fig. 4 is a rear view schematically illustrating a lifting device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a use state of a lifting device according to an embodiment of the present invention;

FIG. 6 is a structural diagram of a lifting device provided in an embodiment of the present invention, which is installed on a mahjong table and is not lifted;

fig. 7 is a structural schematic diagram of a lifting device provided by an embodiment of the invention in a rising state after being installed on a mahjong table.

In the figure: the pipe fitting comprises a base 1, a first pipe body 2, a second pipe body 3, a third pipe body 4, a limiting bearing 5, a first moving groove 21, a first rack 22, a first limiting groove 23, a gear 31, a shaft sleeve 32, a rotating shaft 33, a through hole 34, a second moving groove 41, a second rack 42, a second limiting groove 43, a mounting seat 61, a crank 62, a motor 63, a rocker arm 64, a bearing 65 and a fixing lath 7.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1, a lifting device provided in embodiment 1 of the present invention includes: the base is of a shell structure with the top, the front side and the rear side being open, and two sides of the shell are respectively provided with an installation edge with a screw hole; the telescopic rod is arranged on the base 1, is vertically arranged on the base 1 and at least comprises a first pipe body 2, a second pipe body 3 and a third pipe body 4 which are sleeved from outside to inside in a sliding manner, and the first pipe body 2, the second pipe body 3 and the third pipe body 4 are connected in a linkage manner through a linkage device; and a driving device capable of driving the second tubular body 3 and the third tubular body 4 to ascend simultaneously.

When in use, please refer to fig. 5, 6 and 7, the base is mounted on the mounting vacancy in the mounting groove of the mahjong table, the dice tray is mounted on the top of the third tube body, the mounting mode is common mounting, the second tube body can be driven to ascend through the driving device, and the third tube body ascends relative to the second tube body at the same time when the second tube body ascends relative to the first tube body due to the fact that the third tube body is connected with the second tube body through the linkage device, and the height of the dice tray mounted on the top of the third tube body can be greatly improved when in use through superposition of the ascending heights of the two tube bodies; meanwhile, the device is compact in structure, is directly installed in the installation groove of the mahjong table, does not need to install a protection box at the bottom of the mahjong table, and reduces occupation of the bottom space of the mahjong table.

It should be noted that the directional terms such as top, top front side and back side, etc. described herein are described in the direction of the corresponding drawings, and are only for convenience of understanding the present invention, and are not intended to limit the scope of the present invention.

Example 2

Referring to fig. 1, a lifting device provided in embodiment 2 of the present invention includes: the base is of a shell structure with the top, the front side and the rear side being open, and two sides of the shell are respectively provided with an installation edge with a screw hole; the telescopic rod is arranged on the base 1, is vertically arranged in the base 1 and at least comprises a first pipe body 2, a second pipe body 3 and a third pipe body 4 which are sleeved from outside to inside in a sliding manner, and the first pipe body 2, the second pipe body 3 and the third pipe body 4 are connected in a linkage manner through a linkage device; and a driving device capable of driving the second tubular body 3 and the third tubular body 4 to ascend simultaneously.

When the dice tray is used, please refer to fig. 5, the base is installed on an installation vacancy in an installation groove of a mahjong table, the dice tray is installed at the top of the third tube body, the installation mode is common installation, the second tube body can be driven to ascend through the driving device, the third tube body is connected with the second tube body through the linkage device, the third tube body also ascends along with the second tube body when the second tube body ascends, and the height of the dice tray can be greatly improved when the dice tray is used through the superposition of the two tube bodies; meanwhile, the device is compact in structure, is directly installed in the installation groove of the mahjong table, does not need to install a protection box at the bottom of the mahjong table, and reduces occupation of the bottom space of the mahjong table.

Further preferred, linkages include, but are not limited to: referring to fig. 2, a first moving groove 21 is disposed on an outer ring of the first pipe 2, and a first rack 22 is disposed at a bottom of the first moving groove 21; a second moving groove 41 arranged on the outer ring of the third pipe body 4, wherein a second rack 42 is arranged at the bottom of the second moving groove 41; and a gear 31 rotatably disposed on the second tube 3, wherein one side of the gear 31 movably penetrates into the second tube 3, and the gear 31 is engaged with the first rack 22 and the second rack 42.

The use principle is as follows: referring to fig. 1, when the driving device drives the second tube 3 to move upward, the gear 31 engaged with the first rack on the first tube 2 starts to rotate, and when the gear 31 rotates, the second rack 42 on the third tube is engaged with the gear 31, so that when the gear 31 rotates, the third tube is driven to ascend, and the purpose that the second tube and the third tube ascend in the same direction is achieved.

It should be noted that the second tube 3 is provided with a through hole 34 for the gear 31 to rotate, and the rotating shaft and the through hole are on the same axis when the device is installed. The purpose of not influencing the rotation of the gear is achieved.

Preferably, as shown in fig. 2, a limiting member is disposed on an outer ring of the second pipe 3, and the limiting member penetrates through the second pipe 3; the gear 31 is rotatably sleeved on the limiting piece; the first pipe body 2 is provided with a first limiting groove 23 which is in sliding insertion connection with the limiting part, and the first limiting groove 23 is axially arranged along the first pipe body 2. The third tube 4 is provided with a second limiting groove 43 slidably inserted with the limiting member, and the second limiting groove 43 is axially arranged along the third tube 4. The locating part includes spacing bearing 5, pivot 33, and gear 31 rotates to cup joint on pivot 33. Can install fixed lath 7 on the second body for the pivot can be stable on the second body, fixed lath 7 is L type structure, and fixed lath corner is in the through-hole position, and pivot one end extends to the through-hole outside and is connected with fixed lath.

In order to prevent the second tube body and the third tube body from rotating when rising, the second tube body and the third tube body can smoothly rise through the arranged rotating shaft and the limiting grooves formed in the second tube body and the third tube body to prevent the tube bodies from rotating when rising.

More preferably, as shown in fig. 4, a limit bearing may be sleeved on the rotating shaft in the limit groove (including the first limit groove and the second limit groove), and a gap exists between an outer ring of the limit bearing and an inner wall of the limit groove, so as to reduce resistance during lifting, or to install other components for reducing resistance, such as: rollers, balls, etc.

Example 3

Referring to fig. 1, a lifting device provided in embodiment 3 of the present invention includes: the base is of a shell structure with the top, the front side and the rear side being open, and two sides of the shell are respectively provided with an installation edge with a screw hole; the telescopic rod is arranged on the base 1, is vertically arranged in the base 1 and at least comprises a first pipe body 2, a second pipe body 3 and a third pipe body 4 which are sleeved from outside to inside in a sliding manner, and the first pipe body 2, the second pipe body 3 and the third pipe body 4 are connected in a linkage manner through a linkage device; and a driving device capable of driving the second tubular body 3 and the third tubular body 4 to ascend simultaneously.

Linkages include, but are not limited to: referring to fig. 2, a first moving groove 21 is disposed on an outer ring of the first pipe 2, and a first rack 22 is disposed at a bottom of the first moving groove 21; a second moving groove 41 arranged on the outer ring of the third pipe body 4, wherein a second rack 42 is arranged at the bottom of the second moving groove 41; and a gear 31 rotatably disposed on the second tube 3, wherein one side of the gear 31 movably penetrates into the second tube 3, and the gear 31 is engaged with the first rack 22 and the second rack 42.

The use principle is as follows: referring to fig. 1, when the driving device drives the second tube 3 to move upward, the gear 31 engaged with the first rack on the first tube 2 starts to rotate, and when the gear 31 rotates, the second rack 42 on the third tube is engaged with the gear 31, so that the gear 31 rotates to drive the third tube 4 to ascend, and the purpose of ascending the second tube and the third tube in the same direction is achieved.

The second pipe 3 is provided with a through hole 34 through which the gear 31 rotates. The purpose of not influencing the rotation of the gear is achieved.

Referring to fig. 2, a limiting member is disposed on an outer ring of the second pipe 3, and the limiting member penetrates through the second pipe 3; the gear 31 is rotatably sleeved on the limiting piece; the first pipe body 2 is provided with a first limiting groove 23 which is in sliding insertion connection with the limiting part, and the first limiting groove 23 is axially arranged along the first pipe body 2. The third tube 4 is provided with a second limiting groove 43 slidably inserted with the limiting member, and the second limiting groove 43 is axially arranged along the third tube 4. The limiting part comprises a limiting bearing 5 and a rotating shaft 33, and the gear 31 is positioned and sleeved on the rotating shaft 33 through a shaft sleeve 32.

The rotating shaft 33, the through hole 34, the gear 31, the limiting bearing 5 and the shaft sleeve 32 are located on the same axial line, please refer to fig. 3, one end of the rotating shaft 33 is connected to the second pipe 3 and penetrates through the second pipe 3 to the outside, the other end extends to the outside of the through hole 34, the gear 31 is rotatably sleeved on the rotating shaft 32, at this time, the gear 31 is easy to move axially on the rotating shaft 33, the shaft sleeve 32 is rotatably sleeved on the rotating shaft 33 to limit the axial movement of the gear 31, the shaft sleeve 32 is located between the connecting ends of the gear 31, the rotating shaft 33 and the second pipe 3, and the other end of the rotating shaft limits the axial movement of the.

Can be equipped with spacing bearing in the pivot of being in the spacing groove (including first spacing groove and second spacing groove), the outer lane of spacing bearing has the clearance with spacing inslot wall, reduces the resistance when ascending, perhaps installs other parts that reduce the resistance like, gyro wheel, ball etc..

The driving device can be driven by a cylinder and the like, and the embodiment is preferably as follows: referring to fig. 1, the driving device includes but is not limited to: a mounting seat 61; the bearing 65, the bearing 65 is connected to the second tube 3 rotatably; one end of the crank 62 is hinged with the mounting seat 61, and the other end of the crank 62 is contacted with the bottom of the bearing 65; a motor 63; and one end of the rocker arm 64 is connected to the output end of the motor 63, and the other end of the rocker arm 64 can be in contact with the crank 62, wherein in the process that the output end of the motor 63 drives the rocker arm 64 to rotate, one end of the crank 62 far away from the mounting seat 61 can be lifted through the rocker arm 64. When the crank is used, the end of the crank contacting the bearing 65 does not come off the bearing when the second pipe is lifted.

The use principle is as follows: the driving device is arranged in the mounting groove of the mahjong table, the mounting seat is arranged on the main board at the bottom of the mounting groove, the common mounting mode is adopted, after the mounting is finished, as shown in figure 1, the motor rotates to drive the rocker arm 64 to rotate, because the end part of the rocker arm far away from the motor is contacted with the bottom of the crank, the rocker arm gradually lifts up the end of the crank contacted with the bearing 65 when rotating, and in the process of gradually lifting up one end of the crank, the purpose of gradually pushing the second pipe body to rise is achieved, the bearing is used for reducing the resistance of the crank to rise, when the second pipe body 3 moves upwards, the gear 31 engaged with the first rack on the first tubular body 2 starts to rotate, and when the gear 31 rotates, because the second rack 42 on the third pipe body is meshed with the gear 31, when the gear 31 rotates, the third pipe body is driven to ascend, and the purpose that the second pipe body and the third pipe body ascend in the same direction is achieved.

It is further noted that when the rocker arm 64 is rotated to the vertical position, the end of the rocker arm 64 contacting the crank 62 is at the maximum bending point of the crank 62, and the motor stops rotating, and the rocker arm is maintained in the vertical position due to the vertical downward force applied to the rocker arm. More preferably, the motor can adopt a stepping motor with a self-locking device or a stepping motor without a self-locking device, a direct current motor, a brushless motor and a permanent magnet synchronous motor which are selected according to requirements.

When the telescopic rod needs to be retracted, the rocker arm is rotated back to the original position, and the pipe body (the second pipe body and the third pipe body) can be restored to the original position under the self-weight condition.

Example 4

Referring to fig. 1, a lifting device provided in embodiment 4 of the present invention includes: the base is of a shell structure with the top, the front side and the rear side being open, and two sides of the shell are respectively provided with an installation edge with a screw hole; the telescopic rod is arranged on the base 1, is vertically arranged in the base 1 and at least comprises a first pipe body 2, a second pipe body 3 and a third pipe body 4 which are sleeved from outside to inside in a sliding manner, and the first pipe body 2, the second pipe body 3 and the third pipe body 4 are connected in a linkage manner through a linkage device; and a driving device capable of driving the second tubular body 3 and the third tubular body 4 to ascend simultaneously.

Linkages include, but are not limited to: referring to fig. 2, a first moving groove 21 is disposed on an outer ring of the first pipe 2, and a first rack 22 is disposed at a bottom of the first moving groove 21; a second moving groove 41 arranged on the outer ring of the third pipe body 4, wherein a second rack 42 is arranged at the bottom of the second moving groove 41; and a gear 31 rotatably disposed on the second tube 3, wherein one side of the gear 31 movably penetrates into the second tube 3, and the rack 31 is engaged with the first rack 22 and the second rack 42.

The use principle is as follows: referring to fig. 1, when the driving device drives the second tube 3 to move upward, the gear 31 engaged with the first rack 22 on the first tube 2 starts to rotate, and when the gear 31 rotates, the second rack 42 on the third tube is engaged with the gear 31, so that when the gear 31 rotates, the third tube is driven to ascend, and the purpose that the second tube and the third tube ascend in the same direction is achieved.

Preferably, as shown in fig. 2, a limiting member is disposed on an outer ring of the second pipe 3, and the limiting member penetrates through the second pipe 3; the gear 31 is rotatably sleeved on the limiting piece; the first pipe body 2 is provided with a first limiting groove 23 which is in sliding insertion connection with the limiting part, and the first limiting groove 23 is axially arranged along the first pipe body 2. The third tube 4 is provided with a second limiting groove 43 slidably inserted with the limiting member, and the second limiting groove 43 is axially arranged along the third tube 4. The limiting part comprises a rotating shaft 33, and the gear 31 is positioned and sleeved on the rotating shaft 33 through a shaft sleeve 32. Can install fixed lath 7 on the second body for the pivot can be stable on the second body, fixed lath 7 is L type structure, and fixed lath corner is in the through-hole position, and pivot one end extends to the through-hole outside and is connected with fixed lath.

Referring to fig. 1, the driving device includes but is not limited to: a mounting seat 61; the bearing 65, the bearing 65 is connected to the second tube 3 rotatably; one end of the crank 62 is hinged with the mounting seat 61, and the other end of the crank 62 is contacted with the bottom of the bearing 65; a motor 63; and one end of the rocker arm 64 is connected to the output end of the motor 63, and the other end of the rocker arm 64 can be in contact with the crank 62, wherein in the process that the output end of the motor 63 drives the rocker arm 64 to rotate, one end of the crank 62 far away from the mounting seat 61 can be lifted through the rocker arm 64. When the crank is used, the end of the crank contacting the bearing 65 does not come off the bearing when the second pipe is lifted.

The use principle is as follows: the driving device is installed in a mounting groove of a mahjong table, a common installation mode is adopted, after installation is finished, please refer to fig. 1, the motor rotates, the rocker arm 64 is driven to rotate, because the end part of the rocker arm far away from the motor is contacted with the bottom of the crank, the rocker arm gradually supports the end of the crank contacted with the bearing 65 when rotating, and in the process of gradually lifting one end of the crank, the purpose of gradually pushing the second pipe body to rise is realized, the bearing is used for reducing the resistance of the crank to rise, when the second pipe body 3 moves upwards, the gear 31 meshed with the first rack on the first pipe body 2 starts to rotate, when the gear 31 rotates, because the second rack 42 on the third pipe body is meshed with the gear 31, thereby when the gear 31 rotates, the third pipe body is driven to rise, and the purpose of the second pipe body and the third pipe body synchronously lift in.

When the rocker arm 64 is turned to the vertical state, the end of the rocker arm 64 contacting the crank 62 is at the maximum bending point of the crank 62, and the motor stops rotating, so that the rocker arm can be maintained in the vertical state due to the vertical downward force applied to the rocker arm. More preferably, the motor can adopt a stepping motor with a self-locking device or a stepping motor without the self-locking device, and the selection is carried out according to the requirement. When the telescopic rod needs to be retracted, the rocker arm is rotated back to the original position, and the pipe body (the second pipe body and the third pipe body) can be restored to the original position under the self-weight condition.

Further preferably, a return device is connected to the second tube 3, and as shown in fig. 1, the return device includes a return spring, one end of the return spring is connected to the fixing strip 7, and the other end of the return spring is connected to the base 1. During the use, can accelerate the speed that resets of body.

The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape, material or structure, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.

Claims

1. A lifting device, comprising:

a base;

the telescopic rod is arranged on the base and at least comprises a first pipe body, a second pipe body and a third pipe body which are sleeved from outside to inside in a sliding manner, and the first pipe body, the second pipe body and the third pipe body are connected in a linkage manner through a linkage device;

and a driving device capable of driving the second pipe body to ascend relative to the first pipe body, and the third pipe body being capable of ascending relative to the second pipe body through a linkage device.

2. A lifting device as claimed in claim 1, wherein the linkage comprises:

the first moving groove is arranged on the outer ring of the first pipe body, and a first rack is arranged at the bottom of the first moving groove;

the second moving groove is arranged on the outer ring of the third pipe body, and a second rack is arranged at the bottom of the second moving groove; and

the gear is rotatably arranged on the second pipe body, one side of the gear movably penetrates into the second pipe body, and the gear is meshed with the first rack and the second rack simultaneously.

3. A lifting device as claimed in claim 2, wherein the second body is provided with a through-hole for receiving the gear.

4. The lifting device as claimed in claim 2, wherein a limiting member is disposed on an outer ring of the second tube, and the limiting member is disposed through the second tube; the gear is rotatably sleeved on the limiting piece; the first pipe body is provided with a first limiting groove which is in sliding insertion connection with the limiting part, and the first limiting groove is axially arranged along the first pipe body.

5. The lifting device as claimed in claim 4, wherein the third tube has a second limiting groove slidably engaged with the limiting member, and the second limiting groove is axially disposed along the third tube.

6. The lifting device as claimed in claim 4, wherein the limiting member comprises a rotating shaft, the rotating shaft radially penetrates through the second tube, and the gear is rotatably sleeved on the rotating shaft.

7. A lifting device as claimed in claim 1, characterized in that the drive means comprise:

a mounting seat;

the bearing is rotatably connected to the second pipe body;

one end of the crank is hinged with the mounting seat, and the other end of the crank is contacted with the bottom of the bearing;

a motor;

and the rocker arm, rocker arm one end connect in the motor output, the other end can contact with the crank, wherein, the motor output drives the rocker arm and rotates the in-process, can will through the rocker arm the crank is kept away from the one end of mount pad is lifted up.

8. A lifting device as claimed in claim 7, wherein the end of the rocker arm in contact with the crank is at the point of maximum flexure of the crank when the rocker arm is rotated to the upright position.

9. A lifting device as claimed in claim 7, wherein the motor comprises either a stepper motor or a permanent magnet synchronous motor.

10. A lifting device as claimed in claim 1 wherein a reset device is connected to said second body.