Lifting device

Abstract

The utility model provides a lifting device which comprises a bottom plate, supporting legs, a transmission mechanism and a lifting mechanism, the lifting mechanism comprises a shaft sleeve, a lifting rod and a transmission shaft, the shaft sleeve is connected to the bottom plate, a cavity is formed in the shaft sleeve, at least part of the transmission shaft and at least part of the lifting rod are arranged in the cavity, and the supporting legs are arranged on the bottom plate. One end of the transmission rod is in threaded connection with the lifting rod, and the other end of the transmission rod is connected with the supporting leg; the transmission mechanism comprises a transmission belt and a transmission wheel, the transmission belt is used for driving the transmission wheel to rotate, and the transmission wheel is used for driving the transmission shaft to rotate. According to the device, one transmission mechanism motor can drive a plurality of lifting mechanisms to do lifting motion, electric control is simple, the size of the device is reduced, and meanwhile the lifting mechanisms are high in synchronism and convenient to install and use.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a lifting device. Background Art

[0002] Many medium or large-sized equipment, such as medical trolleys and precision laboratory platforms, need to be moved and adjusted in height during use. Currently, the lifting and lowering of the equipment is generally achieved by controlling the lifting and lowering movement of each supporting foot at the bottom of the equipment through a motor. This requires each supporting foot to be driven by a corresponding motor. The synchronization of the supporting foot movement during the lifting process is poor, and multiple motors make the electrical control complex and the lifting mechanism large in size. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide a lifting device that can realize the lifting of multiple motion units by a single drive method, the synchronization of each motion unit is good, and it is small in size and easy to use.

[0004] The utility model provides a lifting device, comprising a bottom plate, supporting feet, a transmission mechanism and a lifting mechanism, wherein:

[0005] The lifting mechanism comprises a sleeve, a lifting rod, and a transmission shaft, wherein the sleeve is connected to the bottom plate, the sleeve has a cavity inside, the transmission shaft and at least part of the lifting rod are arranged in the cavity, one end of the lifting rod is connected to the transmission shaft by a thread, and the other end is connected to the supporting foot;

[0006] The transmission mechanism comprises a transmission belt and a transmission wheel. The transmission belt is used to drive the transmission wheel to rotate, and the transmission wheel is used to drive the transmission shaft to rotate.

[0007] In one embodiment, a first limiting member is provided on the inner wall of the shaft sleeve, and the first limiting member is used to limit the rotation of the lifting rod.

[0008] In one embodiment, a limiting groove is provided on the lifting rod, and at least a portion of the first limiting member is disposed in the limiting groove.

[0009] In one embodiment, the bushing, the transmission wheel, and the lifting rod are coaxially arranged.

[0010] In one embodiment, the bushing is connected to the transmission shaft via a bearing.

[0011] In one embodiment, a limiting portion is provided on the lifting rod, and a diameter of the limiting portion is larger than a diameter of other parts of the lifting rod.

[0012] In one embodiment, a second limiting member is provided on the inner wall of the shaft sleeve, and the second limiting member is used to limit the longest distance from the limiting portion to the bottom plate.

[0013] In one embodiment, a third limiting member is provided on the inner wall of the shaft sleeve, and the third limiting member is used to limit the shortest distance from the limiting portion to the bottom plate.

[0014] In one embodiment, projections of at least parts of the second and third limiting members on a plane perpendicular to the axis or center line of the lifting rod are inside the projections of the limiting members on the plane.

[0015] In one embodiment, the lifting device further includes a motor, an output shaft of the motor is connected to the transmission belt, and the motor is used to drive the transmission belt to move.

[0016] In one embodiment, the output shaft of the motor is connected to a driving wheel, and the transmission belt is connected to the driving wheel and the transmission wheel.

[0017] In one embodiment, a tensioning wheel is provided on the bottom plate, and the tensioning wheel is used to put the transmission belt in a tensioned state.

[0018] Compared with the prior art, the lifting device provided by the utility model has the following beneficial effects:

[0019] 1. One transmission motor can drive multiple lifting mechanisms to perform lifting movements. The electrical control is simple, which saves the number of motors and other components, saves space, and reduces production costs.

[0020] 2. The transmission mechanism drives each lifting mechanism to perform lifting motion at the same time, and the lifting mechanism has high synchronization;

[0021] 3. The transmission belt drives each transmission wheel and the setting of the lifting mechanism. The compact layout reduces the volume of the lifting mechanism, further reduces the occupied space, and is easy to install and use.

[0022] 4. Able to withstand greater external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 This is a schematic structural diagram of a lifting device according to an embodiment of the present utility model;

[0025] Figure 2 A side view of a lifting device shown as an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of a lifting mechanism and supporting feet showing an embodiment of the utility model;

[0027] Figure 4 This is a schematic structural diagram of a transmission mechanism according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] 10. Base plate; 101. Lifting mechanism; 102. Drive belt; 103. Drive mechanism; 104. Support foot; 107. Tension wheel; 201. Bushing; 202. Drive shaft; 203. Lifting rod; 204. Drive wheel; 205. First limiter; 206. Second limiter; 207. Third limiter; 209. Limiting part; 301. Bracket; 302. Motor; 303. Worm reducer; 304. Driving wheel; 305. Driven wheel. DETAILED DESCRIPTION

[0030] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0031] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. The term "proximal end" is usually the end close to the operator, and the term "distal end" is usually the end close to the patient. "One end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which include not only the endpoints. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. In addition, as used in the present utility model, an element is arranged on another element, which usually only means that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, and it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any position such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] The core idea of ​​the utility model is to provide a lifting device to solve the problems of needing multiple motor drives and poor synchronization performance in the prior art.

[0033] This embodiment provides a lifting device, referring to Figure 1 and Figure 2 , including a base plate 10, support legs 104, a transmission mechanism 103 and a lifting mechanism 101. The support legs 104 are located at the lower part of the base plate 10, and the transmission mechanism 103 and the lifting mechanism 101 are located at the upper part of the base plate 10. The number of support legs 104 is generally 3 or more. In this embodiment, four support legs 104 are provided, which are respectively located near the four corners of the base plate 10.

[0034] refer to Figure 1 , Figure 2 ,and Figure 4The transmission mechanism 103 includes a motor 302, a transmission belt 102, and four transmission wheels 204. The output shaft of the motor 302 connects the four transmission wheels 204 together through the transmission belt 102, and the motor 302 can drive the four transmission wheels 204 to rotate synchronously. The transmission belt 102 is an annular belt, which is wound around the four transmission wheels 204 respectively. Under the drive of the motor 302, the transmission belt 102 transmits the rotation to the transmission wheel 204.

[0035] Specifically, the transmission mechanism 103 further includes a tensioning wheel 107. Three to six tensioning wheels 107 may be provided. In this embodiment, five tensioning wheels 107 are provided. The transmission belt 102 is passed around the inner side of the tensioning wheels 107. The five tensioning wheels 107 are provided inside the four lifting mechanisms, so that the transmission belt 102 is always in a tensioned state, thereby ensuring a normal and stable transmission state.

[0036] Furthermore, the transmission mechanism 103 also includes a bracket 301, a worm reducer 303, a driving wheel 304, and a driven wheel 305. The motor 302 and the bracket 301 are fixedly connected to the base plate 10, and the worm reducer 303 is located between the bracket 301 and the base plate 10. The output shaft of the motor 302 is connected to the worm reducer 303 and the driving wheel 304, and the driving wheel 304 is connected to the two driven wheels 305 through the transmission belt 102, that is, the transmission belt passes around the two driven wheels 305, the transmission wheel 204 and the tension wheel 107 respectively, and transmits the rotation to the transmission wheel 102. The worm reducer 303 is used to match the rotation speed and transmit torque. The motor 302 can select a DC power supply, and realize the forward and reverse rotation of the driving wheel through circuit control.

[0037] Reference Figure 3The lifting mechanism 101 includes a coaxially arranged sleeve 201, a transmission shaft 202, and a lifting rod 203. The sleeve 201 has a cavity inside, and the transmission shaft 202 and the lifting rod 203 are located in the cavity. The transmission wheel 204 is connected to the transmission shaft 202, and when the transmission wheel 204 rotates, it can drive the transmission shaft 202 to rotate. The transmission shaft 202 and the sleeve 201 can be connected through a bearing, and the interior of the transmission shaft 202 is provided with an internal thread, and the upper end of the lifting rod 203 is provided with an external thread that matches the internal thread of the transmission shaft 202, and the transmission shaft 202 and the lifting rod 203 are connected through internal and external threads. A first stopper 205 is also provided on the inner wall of the sleeve 201, and the lifting rod 203 can move up and down relative to the first stopper 205, but cannot rotate. Specifically, the lifting rod 203 is provided with a groove parallel to its axis, and the lifting rod 203 passes through the groove. The lower end of each lifting rod 203 is connected to a corresponding support foot 104. In this embodiment, a total of four support legs 104 are provided, and each lifting mechanism corresponds to one support leg 104. When the transmission wheel 204 rotates, the transmission shaft 202 is driven to rotate. Under the action of the internal and external threads and the first limiter 205, the rotation of the transmission shaft 202 drives the relative up and down movement of the lifting rod 203 and the sleeve 201. When the support legs 104 are always fixed on the ground, the up and down movement of the sleeve 201 and the bottom plate 10 fixedly connected to the sleeve 201 is realized, that is, the lifting movement thereof is realized. During the lifting or descending process of the lifting mechanism, the movement of the four support legs is always in a synchronous state, and the synchronization performance is good, and the entire device is in a relatively stable state during the lifting process.

[0038] Furthermore, a stopper 209 is provided in the middle of the lifting rod 203, and the diameter of the stopper 209 is larger than the diameter of other parts of the lifting rod 203. A second stopper 206 and a third stopper 207 are provided on the inner wall of the sleeve 201, and the second stopper 206 is located above the stopper 209, and the third stopper 207 is located below the stopper 209, and the projections of the second stopper 206 and the third stopper 207 on a plane perpendicular to the axis of the lifting rod 203 are inside the projection of the stopper 209 on the plane. When the sleeve 201 moves downward, the second stopper 206 will contact the stopper 209 and prevent the sleeve 201 from continuing to move downward, thereby limiting the minimum height of the sleeve 201 and the bottom plate 10. When the shaft sleeve 201 moves upward, the third limiting member 207 will contact the limiting portion 209 and prevent the shaft sleeve 201 from continuing to move upward, thereby limiting the maximum height of the shaft sleeve 201 and the bottom plate 10 .

[0039] More specifically, the transmission mechanism 103 further includes a tensioning wheel 107. Three to six tensioning wheels 107 may be provided. In this embodiment, five tensioning wheels 107 are provided. The transmission belt 102 is passed around the inner side of the tensioning wheels 107. The five tensioning wheels 107 are provided inside the four lifting mechanisms, so that the transmission belt 102 is always in a tensioned state, thereby ensuring a normal and stable transmission state.

[0040] In addition, the transmission mechanism 103 includes a motor 302, a bracket 301, a worm reducer 303, a driving wheel 304, and a driven wheel 305. The motor 302 and the bracket 301 are fixedly connected to the base plate 10, and the worm reducer 303 is located inside the bracket 301. The output shaft of the motor 302 is connected to the worm reducer 303 and the driving wheel 304, and the driving wheel 304 is connected to the two driven wheels 305 through the transmission belt 102, that is, the transmission belt passes around the two driven wheels 305, the transmission wheel 204 and the tension wheel 107 respectively, and transmits the rotation to the transmission wheel 102. The worm reducer 303 is used to match the rotation speed and transmit torque. The motor 302 can select a DC power supply, and realize the forward and reverse rotation of the driving wheel through circuit control.

[0041] The above is a description of the specific embodiments of the utility model, which is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be based on the attached claims.

Claims

1. A lifting device, characterized in that: It includes a base plate, supporting feet, a transmission mechanism and a lifting mechanism, wherein: The lifting mechanism comprises a sleeve, a lifting rod, and a transmission shaft, wherein the sleeve is connected to the bottom plate, the sleeve has a cavity inside, the transmission shaft and at least part of the lifting rod are arranged in the cavity, one end of the lifting rod is connected to the transmission shaft by a thread, and the other end is connected to the supporting foot; The transmission mechanism comprises a transmission belt and a transmission wheel. The transmission belt is used to drive the transmission wheel to rotate, and the transmission wheel is used to drive the transmission shaft to rotate.

2. The lifting device according to claim 1, characterized in that: A first limiting member is provided on the inner wall of the shaft sleeve, and the first limiting member is used to limit the rotation of the lifting rod.

3. The lifting device according to claim 2, characterized in that: The lifting rod is provided with a limiting groove, and at least a part of the first limiting member is arranged in the limiting groove.

4. The lifting device according to claim 1, characterized in that: The shaft sleeve, the transmission wheel, and the lifting rod are coaxially arranged.

5. The lifting device according to claim 1, characterized in that: A limiting portion is provided on the lifting rod.

6. The lifting device according to claim 5, characterized in that: A second limiting member and / or a third limiting member are provided on the inner wall of the shaft sleeve, and the second limiting member and / or the third limiting member are used to limit the distance from the shaft sleeve or the base plate to the supporting foot.

7. The lifting device according to claim 6, characterized in that: The projections of at least parts of the second and third limiting members on a plane perpendicular to the axis or center line of the lifting rod are inside the projections of the limiting members on the plane.

8. The lifting device according to claim 1, characterized in that: A motor is included, and the motor is used to drive the transmission belt to rotate.

9. The lifting device according to claim 1, characterized in that: A tensioning wheel is arranged on the bottom plate, and the tensioning wheel is used to put the transmission belt in a tensioned state.

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