Linear drive device

Abstract

The application relates to a linear driving device which comprises a base, a support plate, a rotary body, a first cable, a second cable, a first winding shaft, a second winding shaft, a first lifting platform and a second lifting platform. One end of the first winding shaft is fixed to the rotary body, and the other end of the first winding shaft is arranged through the central through hole of the first lifting platform. One end of the second winding shaft is fixed to the rotary body, and the other end of the second winding shaft is arranged through the central through hole of the second lifting platform. The first winding shaft and the second winding shaft are arranged in a straight line. The first cable is wound on the first winding shaft, one end of the first cable is fixed to a preset position on the upper surface of the rotary body, and the other end of the first cable is fixed to a preset position of the base through the first through hole on the first lifting platform. The second cable is wound on the second winding shaft, one end of the second cable is fixed to the lower surface of the rotary body, and the other end of the second cable is fixed to the support plate through the second through hole on the second lifting platform. The device can realize stable linear driving.

Description

Technical Field

[0001] This application relates to the field of linear drive technology, and in particular to a linear drive device. Background Technology

[0002] With the development of science and technology, linear drive technology has also emerged. The use of linear drive devices to push, pull, and lift objects is becoming more and more common, and it has become an indispensable part of industrial development.

[0003] In traditional technology, linear drive is achieved through a lifting platform and a driver, enabling bidirectional vertical movement of the platform. Generally, linear motion driven by a driver can be divided into two types: one is a linear driver that directly outputs linear motion; the other is a rotary driver that outputs linear motion through a lead screw or linkage mechanism. However, linear motors are expensive and difficult to use for stable, high-precision, and high-speed position output. Rotary drivers have poor shock resistance and are not suitable for impact-prone environments. Therefore, linear drive devices based on this principle cannot achieve stable movement. Summary of the Invention

[0004] Therefore, it is necessary to provide a stable linear drive device to address the aforementioned technical problems.

[0005] A linear drive device includes a base, a support plate, a rotating body, a first cable, a second cable, a first winding shaft, a second winding shaft, a first lifting platform, and a second lifting platform;

[0006] One end of the first winding shaft is fixed to the rotating body, and the other end of the first winding shaft passes through the central through hole of the first lifting platform; one end of the second winding shaft is fixed to the rotating body, and the other end of the second winding shaft passes through the central through hole of the second lifting platform; the first winding shaft and the second winding shaft are arranged in a straight line.

[0007] The first cable is wound around the first winding shaft, one end of the first cable is fixed to a preset position on the upper surface of the rotating body, and the other end of the first cable passes through the first through hole on the first lifting platform and is fixed to a preset position on the base; the second cable is wound around the second winding shaft, one end of the second cable is fixed to a preset position on the lower surface of the rotating body, and the other end of the second cable passes through the second through hole on the second lifting platform and is fixed to a preset position in the support plate.

[0008] In one embodiment, a second support plate is also included, the second support plate having a through hole at its center, and the rotating body is embedded in the through hole at the center of the second support plate.

[0009] In one embodiment, a first guide shaft is also included;

[0010] One end of the first guide shaft is fixed to the base, and the other end of the first guide shaft is fixed to the support plate. The first guide shaft passes vertically through the third through hole in the first lifting platform, the fourth through hole in the second support plate, and the fifth through hole in the second lifting platform.

[0011] In one embodiment, the number of the first guide shafts includes at least three.

[0012] In one embodiment, it further includes a load support plate, a drive assembly, a first transmission element, a drive shaft, and a second transmission element;

[0013] The drive assembly is sequentially connected to the rotating body via the first transmission member, the transmission shaft, and the second transmission member. The drive assembly and the first transmission member are disposed on the load support plate, and the second transmission member is disposed on the second support plate.

[0014] In one embodiment, the first transmission component includes a first driving wheel, a first driven wheel, and a first synchronous belt sleeved on the first driving wheel and the first driven wheel; the first driving wheel is connected to the drive assembly, and the first driven wheel is connected to one end of the transmission shaft;

[0015] The second transmission component includes a second driving wheel, a second driven wheel, and a second synchronous belt sleeved on the second driving wheel and the second driven wheel; the second driving wheel is connected to the rotating body, and the second driven wheel is connected to the other end of the transmission shaft.

[0016] In one embodiment, the driving component includes a rotary drive.

[0017] In one embodiment, it further includes a linear bearing and a second guide shaft;

[0018] The linear bearing is fixed at the sixth through hole of the support plate; one end of the second guide shaft is fixed to the load support plate, the other end of the second guide shaft is fixed to the second support plate, and the second guide shaft passes through the linear bearing.

[0019] In one embodiment, the number of the second guide shafts includes at least three.

[0020] In one embodiment, the first cable includes a first rope, and the second cable includes a second rope.

[0021] The aforementioned linear drive device includes a base, a support plate, a rotating body, a first cable, a second cable, a first winding shaft, a second winding shaft, a first lifting platform, and a second lifting platform. One end of the first winding shaft is fixed to the rotating body, and the other end of the first winding shaft passes through the central through hole of the first lifting platform. One end of the second winding shaft is fixed to the rotating body, and the other end of the second winding shaft passes through the central through hole of the second lifting platform. The first winding shaft and the second winding shaft are arranged in a straight line. The first cable is wound around the first winding shaft, one end of the first cable is fixed to a preset position on the upper surface of the rotating body, and the other end of the first cable passes through a first through hole on the first lifting platform and is fixed to a preset position on the base. The second cable is wound around the second winding shaft, one end of the second cable is fixed to a preset position on the lower surface of the rotating body, and the other end of the second cable passes through a second through hole on the second lifting platform and is fixed to a preset position in the support plate. Throughout the process, by driving the rotating body, the number of times the first and second cables connected to the rotating body are wound on the winding shaft is increased or decreased, thereby driving the lifting platform to move stably. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a linear drive device in one embodiment;

[0024] Figure 2 This is a schematic diagram of the specific structure of the second support plate in a linear drive device in one embodiment;

[0025] Figure 3 This is a schematic diagram of the specific structure of the first guide shaft in a linear drive device in one embodiment;

[0026] Figure 4 This is a schematic diagram of the specific structure of the load support plate, drive assembly, first transmission component, transmission shaft and second transmission component in a linear drive device in one embodiment;

[0027] Figure 5 This is a schematic diagram of the specific structure of the linear bearing and the second guide shaft in a linear drive device in one embodiment;

[0028] Figure 6 This is a schematic diagram of the structure of the first cable and the second cable in a linear drive device in one embodiment;

[0029] Figure 7 This is a schematic diagram of the structure of the first rope and the second rope in a linear drive device in one embodiment;

[0030] Figure 8 This is a schematic diagram of the specific structure of the fixed end in a linear drive device in one embodiment;

[0031] Figure 9 This is a schematic diagram of the specific structure of the moving end in a linear drive device in one embodiment;

[0032] Figure 10 This is a schematic diagram of the overall structure of the linear drive device in one embodiment;

[0033] Figure 11 A view and its cross-sectional view of a linear drive device in one embodiment;

[0034] Figure 12 This is a schematic diagram of a linear drive device in one embodiment, illustrating the principle of linear drive.

[0035] Figure 13 This is a schematic diagram of the equidistant winding structure of a linear drive device in one embodiment;

[0036] Figure 14 This is a diagram showing the rotational state of the winding shaft in a linear drive device according to one embodiment. Detailed Implementation

[0037] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0040] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0041] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0042] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0043] In one embodiment, such as Figure 1 As shown, the linear drive device includes a base 110, a support plate 120, a rotating body 210, a first cable 310, a second cable 320, a first winding shaft 330, a second winding shaft 340, a first lifting platform 350, and a second lifting platform 360.

[0044] One end of the first winding shaft 330 is fixed to the rotating body 210, and the other end of the first winding shaft 330 passes through the central through hole of the first lifting platform 350; one end of the second winding shaft 340 is fixed to the rotating body 210, and the other end of the second winding shaft 340 passes through the central through hole of the second lifting platform 360; the first winding shaft 330 and the second winding shaft 340 are arranged in a straight line.

[0045] The first cable 310 is wound around the first winding shaft 330. One end of the first cable 310 is fixed to a preset position on the upper surface of the rotating body 210, and the other end of the first cable 310 passes through the first through hole on the first lifting platform 350 and is fixed to a preset position on the base 110. The second cable 320 is wound around the second winding shaft 340. One end of the second cable 320 is fixed to a preset position on the lower surface of the rotating body 210, and the other end of the second cable 320 passes through the second through hole on the second lifting platform 360 and is fixed to a preset position in the support plate 120.

[0046] The rotating body 210 is an object capable of rotating about its axis. Both the first winding shaft 330 and the second winding shaft 340 have threads with a pitch of P, serving as shafts for winding the cables, and have a diameter of D. The first cable 310 and the second cable 320 are two sets of cables of equal length, each composed of the same number of cables. The central through holes of the first lifting platform 350 and the second lifting platform 360 contain internal threads that allow the winding shafts to engage. The base 110 is a component of any shape used to support the overall structure, generally cylindrical.

[0047] Specifically, the linear drive device includes a drive force control module and a spindle system. The drive force control module includes a fixed end and a moving end, with the moving end capable of bidirectional movement based on the fixed end. The fixed end includes a base 110 and a support plate 120, the moving end includes a rotating body 210, and the spindle system includes a first cable 310, a second cable 320, a first winding shaft 330, a second winding shaft 340, a first lifting platform 350, and a second lifting platform 360. Both the first lifting platform 350 and the second lifting platform 360 have a central through hole. Taking the base 110 at the top as an example, one end of the first winding shaft 330 is fixed at the center of the upper surface of the rotating body 210 and passes through the center through hole of the first lifting platform 350; one end of the second winding shaft 340 is fixed at the center of the lower surface of the rotating body 210, and the other end of the second winding shaft 340 passes through the center through hole of the second lifting platform 360. The first winding shaft 330 and the second winding shaft 340 are on the same straight line. That is to say, if the first winding shaft 330 and the second winding shaft 340 are regarded as a shaft, this shaft passes through the first lifting platform 350, the rotating body 210, and the second lifting platform 360 in sequence.

[0048] Furthermore, taking the base 110 at the top as an example, the first lifting platform 350 is located between the base 110 and the rotating body 210, and the second lifting platform 360 is located between the rotating body 210 and the support plate 120. The first lifting platform 350 and the second lifting platform 360 have rounded corner through holes distributed around their circumferences, the same number as the cables in the first cable 310 and the second cable 320, for guiding each cable. The through hole in the first lifting platform 350 used for cable guidance is considered as the first through hole, and the through hole in the second lifting platform 360 used for cable guidance is considered as the second through hole. One end of the first cable 310 is fixed at a preset position on the upper surface of the rotating body 210, generally at the center position. It is wound along the same direction as the winding shaft to the maximum number of turns, ensuring the ropes do not overlap and the overall structure remains straight. Then, it passes through the first through hole on the first lifting platform 350 and is fixed at a preset position on the base 110, also generally at the center position. That is, the first cable 310 is wound around the first winding shaft 330. The other end of the first cable 310 passes through the first through hole on the first lifting platform 350 and is fixed at the preset position on the base 110. One end of the second cable 320 is fixed at a preset position on the lower surface of the rotating body 210, usually the center position. It is wound along the same direction of the winding shaft to the maximum number of winding turns, provided that the ropes do not overlap and the whole remains straight. Then it passes through the second through hole on the second lifting platform 360 and is fixed at a preset position on the support plate 120, usually also the center position. That is, the second cable 320 is wound on the second winding shaft 340. The other end of the second cable 320 passes through the second through hole on the second lifting platform 360 and is fixed at a preset position in the support plate 120. The aforementioned linear drive device includes a base, a support plate, a rotating body, a first cable, a second cable, a first winding shaft, a second winding shaft, a first lifting platform, and a second lifting platform. One end of the first winding shaft is fixed to the rotating body, and the other end passes through the central through hole of the first lifting platform. One end of the second winding shaft is fixed to the rotating body, and the other end passes through the central through hole of the second lifting platform. The first and second winding shafts are arranged in a straight line. The first cable is wound around the first winding shaft, with one end fixed to a preset position on the upper surface of the rotating body and the other end passing through a first through hole on the first lifting platform and fixed to a preset position on the base. The second cable is wound around the second winding shaft, with one end fixed to a preset position on the lower surface of the rotating body and the other end passing through a second through hole on the second lifting platform and fixed to a preset position in the support plate. Throughout the process, by driving the rotating body, the number of times the first and second cables connected to the rotating body are wound on the winding shaft is increased or decreased, thereby driving the lifting platform to move stably.

[0049] In one embodiment, such as Figure 2As shown, it also includes a second support plate 220, with a through hole in the center of the second support plate 220, and the rotating body 210 is embedded in the through hole in the center of the second support plate 220.

[0050] Specifically, the mobile terminal also includes a second support plate 220, which has a large through hole in the center. The rotating body 210 is embedded in the central through hole of the second support plate 220 and can be used to fix the rotating body 210 at the initial moment.

[0051] In this embodiment, by opening a through hole in the center of the second support plate, the rotating body can be embedded in the center through hole of the second support plate, thereby fixing the rotating body at the initial moment.

[0052] In one embodiment, such as Figure 3 As shown, it also includes a first guide shaft 130;

[0053] One end of the first guide shaft 130 is fixed to the base 110, and the other end of the first guide shaft 130 is fixed to the support plate 120. The first guide shaft 130 passes vertically through the third through hole in the first lifting platform 350, the fourth through hole in the second support plate 220, and the fifth through hole in the second lifting platform 360.

[0054] Specifically, the fixed end also includes a first guide shaft 130. A third through hole is distributed in the first lifting platform 350, a fourth through hole is distributed in the second support plate, and a fifth through hole is distributed in the second lifting platform. The third, fourth, and fifth through holes allow the guide shaft to pass through. Taking the base 110 located at the top of the linear drive device as an example, one end of the first guide shaft 130 is fixed to the base 110, and the other end is fixed to the support plate 120. The first guide shaft 130 passes vertically from top to bottom through the third through hole in the first lifting platform 350, the fourth through hole in the second support plate 220, and the fifth through hole in the second lifting platform 360. Therefore, the first guide shaft 130 can guide the bidirectional movement of the first lifting platform 350 and the second lifting platform 360.

[0055] In this embodiment, by setting a first guide shaft, one end of the first guide shaft is fixed to the base and the other end of the first guide shaft is fixed to the support plate. The first guide shaft passes through the third through hole in the first lifting platform, the fourth through hole in the second support plate, and the fifth through hole in the second lifting platform, and can guide the bidirectional movement of the first lifting platform and the second lifting platform.

[0056] In one embodiment, such as Figure 3 As shown, the number of first guide shafts 130 includes at least three.

[0057] Specifically, to achieve better guiding effect, the number of first guide shafts 130 includes at least three, and the first guide shafts 130 are circumferentially distributed. Therefore, the number of third through holes 350 in the first lifting platform, fourth through holes 220 in the second support plate, and fifth through holes 360 in the second lifting platform through which the first guide shafts 130 perpendicularly pass is also at least three, and the third through holes, fourth through holes, and fifth through holes are also circumferentially distributed.

[0058] In this embodiment, by setting at least three first guide shafts, the bidirectional movement guidance function of the first lifting platform and the second lifting platform can be better realized.

[0059] In one embodiment, such as Figure 4 As shown, it also includes a load support plate 230, a drive assembly 240, a first transmission component 250, a transmission shaft 260, and a second transmission component 270;

[0060] The drive assembly is sequentially connected to the rotating body 210 via the first transmission component 250, the transmission shaft 260, and the second transmission component 270. The drive assembly 240 and the first transmission component 250 are disposed on the load support plate 230, and the second transmission component 270 is disposed on the second support plate 220.

[0061] Among them, the drive component 240 refers to the component that drives the rotating body 210 to rotate, and the transmission component refers to the component that transmits power between components.

[0062] Specifically, the mobile terminal also includes a drive assembly 240 and a first transmission member 250 disposed on the load support plate 230, and a second transmission member 270 disposed on the second support plate 220. The drive assembly 240 is driveably connected to the first transmission member 250, the first transmission member 250 and the second transmission member 270 are driveably connected to the transmission shaft 260, and the second transmission member 270 is driveably connected to the rotating body 210. That is, the drive assembly 240 is driveably connected to the rotating body 210 embedded in the central through hole of the second support plate 220 through the first transmission member 250, the transmission shaft 260, and the second transmission member 270. The drive assembly 240 drives the rotating body 210 to rotate by driving the first transmission member 250.

[0063] In this embodiment, a drive assembly for the rotating body is provided, along with a load support plate, a first transmission component, a transmission shaft, and a second transmission component. The drive assembly drives the first transmission component, which in turn drives the transmission shaft and the second transmission component, thereby driving the rotating body to rotate.

[0064] In one embodiment, such as Figure 4As shown, the first transmission component 250 includes a first driving wheel 252, a first driven wheel 254, and a first synchronous belt 256 sleeved on the first driving wheel 252 and the first driven wheel 254; the first driving wheel 252 is connected to the drive assembly 240, and the first driven wheel 254 is connected to one end of the transmission shaft 260.

[0065] The second transmission component 270 includes a second driving wheel 272, a second driven wheel 274, and a second synchronous belt 276 sleeved on the second driving wheel 272 and the second driven wheel 274; the second driving wheel 272 is connected to the rotating body 210, and the second driven wheel 274 is connected to the other end of the transmission shaft 260.

[0066] Among them, the driving wheels 252 and 272 are wheels that drive other wheels to rotate and transmit power to them. The driven wheels 254 and 274 are wheels that receive power transmitted from the driving wheels and thus rotate passively.

[0067] Specifically, the first transmission component 250 includes a first driving wheel 252, a first driven wheel 254, and a first synchronous belt 256 sleeved on the first driving wheel 252 and the first driven wheel 254. The first driving wheel 252 is connected to the drive assembly 240, and the first driven wheel 254 is connected to one end of the transmission shaft 260. When the drive assembly 240 is driven, the first driving wheel 252 connected to the drive assembly 240 drives the first synchronous belt 256 to rotate, thereby driving the first driven wheel 254 and the transmission shaft 260 connected to the first driven wheel 254 to rotate. The second driven wheel 274 is connected to the other end of the transmission shaft 260, so the transmission shaft 260 can drive the second driven wheel 274 in the second transmission component 270 to rotate. The second driven wheel 274 drives the second driving wheel 272 to rotate through the second synchronous belt 276. The second driving wheel 272 is connected to the rotating body 210, thereby driving the rotating body 210 to rotate.

[0068] In this embodiment, by setting the transmission components to include a driving wheel, a driven wheel, and a synchronous belt sleeved on the driving wheel and the driven wheel, the drive assembly can drive the rotating body to rotate more efficiently.

[0069] In one embodiment, such as Figure 4 As shown, the drive assembly 240 includes a rotation drive.

[0070] Among them, a rotation drive is a component that drives other components to rotate by rotating itself.

[0071] Specifically, when the drive assembly 240 is to be driven, it can be driven by rotating the drive assembly, that is, rotating the drive assembly, so that the first drive wheel 252 connected to the drive assembly drives the first synchronous belt 256 to rotate, thereby driving the first driven wheel 254 and the transmission shaft 260 connected to the first driven wheel 254 to rotate. The transmission shaft 260 can drive the second driven wheel 274 in the second transmission component 270 to rotate. The second driven wheel 274 drives the second drive wheel 272 to rotate through the second synchronous belt 276, thereby driving the rotating body 210 to rotate.

[0072] In this embodiment, by setting the driving component to include a rotary drive, complex operations are not required to drive the rotating body, making the device achieve bidirectional linear drive more efficient.

[0073] In one embodiment, such as Figure 5 As shown, it also includes a linear bearing 140 and a second guide shaft 280;

[0074] The linear bearing 140 is fixed at the sixth through hole of the support plate 120; one end of the second guide shaft 280 is fixed to the load support plate 230, the other end of the second guide shaft 280 is fixed to the second support plate 220, and the second guide shaft 280 passes through the linear bearing 140.

[0075] Specifically, the fixed end further includes a linear bearing 140, and the movable end further includes a second guide shaft 280. The linear bearing 140 is fixed to the sixth through hole of the support plate 220. One end of the second guide shaft 280 is fixed to the load support plate 230, and the second guide shaft 280 passes through the linear bearing 140 on the support plate 120, so that the other end of the second guide shaft 280 is fixed to the second support plate 220. The linear bearing 140 plays a role in fixing and guiding the second guide shaft 280.

[0076] In this embodiment, by setting a linear bearing, the second guide shaft can be fixed and guided.

[0077] In one embodiment, such as Figure 5 As shown, the number of second guide shafts 280 includes at least three.

[0078] Specifically, in order to achieve better guidance, the number of second guide shafts 280 is at least three, and the second guide shafts 280 are distributed equidistantly in a circle.

[0079] Furthermore, the number of linear bearings 140 and the number of second guide shafts 280 are the same. When the number of second guide shafts 280 includes at least three and the second guide shafts 280 are circumferentially distributed, the number of linear bearings 140 and the number of sixth through holes on the support plate 120 are also at least three and the linear bearings 140 and the sixth through holes are circumferentially distributed.

[0080] In this embodiment, by setting the number of second guide shafts to include at least three, the bidirectional movement of the load support plate and the second support plate can be better guided.

[0081] In one embodiment, such as Figure 6 As shown, the first cable 310 includes a first rope, and the second cable 320 includes a second rope.

[0082] Specifically, ropes have certain elasticity, flexibility, good driving force buffering effect, and lightweight characteristics, and are widely used in long-distance transmission and flexible drive fields. Therefore, the first cable 310 may include a first rope, and the second cable 320 may include a second rope. By setting the ropes to be wound on the winding shaft, more stable bidirectional movement of the linear drive device can be achieved.

[0083] Furthermore, the specific structural connection diagram of the first rope and the second rope on the linear drive device is shown in the figure below. Figure 7 As shown, the C end of the first rope is fixed to the connection at the center of the lower surface of the rotating body 210, and the D end of the second rope is fixed to the center of the support plate 120; the A end of the second rope is fixed to the connection at the center of the upper surface of the rotating body 210, and the B end of the second rope is fixed to the connection at the center of the base 110.

[0084] In this embodiment, by setting the first cable to include a first rope and the second cable to include a second rope, a more stable bidirectional movement of the linear drive device can be achieved.

[0085] In one embodiment, the specific structure of the fixed end can be as follows: Figure 8 As shown, the system includes: a base 110, a support plate 120, a first guide shaft 130, and linear bearings 140. The first guide shaft 130 consists of three guide shafts equidistantly distributed around the circumference, connecting the base 110 to the support plate 120. The linear bearings 140 also consist of three sets of linear bearings.

[0086] In one embodiment, the specific structure of the mobile terminal can be as follows: Figure 9As shown, it includes a load support plate 230, a first transmission component 250, a rotary drive 240, a transmission shaft 260, a second support plate 220, a second transmission component 270, a rotating body 210, and a second guide shaft 280. In the diagram, the first transmission component 250 and the rotary drive 240 are mounted on the load support plate 230, the second transmission component 270 and the rotating body 210 are mounted on the second support plate 220, and the second guide shaft 280 consists of three guide shafts evenly distributed around the circumference, connecting the load support plate 230 and the second support plate 220. One end of the transmission shaft 260 is connected to the rotary drive 240 via the first transmission component 250, and the other end is connected to the rotating body 210 via the second transmission component 270. The transmission shaft 260 is connected to the load support plate 230 and the second support plate 220 via bearings. When the rotary drive 240 rotates, it drives the rotating body 210 to rotate via the first transmission component 250, the transmission shaft 260, and the second transmission component 270. The fixed end and the moving end are connected via a spindle system. The first winding shaft 330, the rotating body 210, and the second winding shaft 340 are all rigid fixed structures. Both winding shafts have threads with a pitch of P and a diameter of D. The first lifting platform 350 and the second lifting platform 360 have internal threads that can mate with the winding shafts. The two lifting platforms are located at both ends of the rotating body. Each lifting platform has three through holes evenly distributed around its outer circumference, which can mate with the first guide shaft 130 to achieve bidirectional linear motion along the guide shaft. In addition, the two lifting platforms also have the same number of rounded corner through holes evenly distributed around their circumference for guiding the first cable 310 and the second cable 320.

[0087] By combining the fixed end, the moving end, and the spindle system, the overall structure of the linear drive device is obtained. Figure 10 In the figure, the first drive wheel 252, the first cable 310, and the second cable 320 are not shown. The unshown first drive wheel 252 is located at the bottom of the drive assembly 240. The view and sectional view of the linear drive device are shown below. Figure 11 As shown, the three sets of linear bearings 140 at the fixed end are slidably connected to the second guide shaft 280 at the moving end, so that the moving end can generate linear motion relative to the fixed end. The support plate 120 has three through holes distributed in equal circles for the passage of the three second guide shafts 280, and there is one through hole for the passage of the transmission shaft 260 at the moving end.

[0088] In one embodiment, taking a cable as the rope and a drive assembly 240 as a rotary drive as an example, the sample to be driven is placed on the back of the rotary drive in the load support plate, and the linear drive of the sample to be driven is achieved by a linear drive device as follows: Figure 12 As shown, it can be:

[0089] The diameter of the winding shaft is D, the angle between the first rope and the winding shaft is α, and the angle between the second rope and the winding shaft is β. When the rotating body rotates one revolution... Because α and β are not equal and are constantly changing during the winding process, ΔL1 and ΔL2 are not equal after each revolution. At this point, the rotating body cannot move axially along the rotation axis. Therefore, for the rotating body to move axially along the rotation axis, ΔL1 and ΔL2 must be equal, i.e., α = β. Here, ΔL1 is the vertical distance between the first lifting plate and the rotating body, and ΔL2 is the vertical distance between the second lifting plate and the rotating body. Both must have equal rates of change to ensure that the two lifting plates move synchronously relative to the rotating body with equal intervals.

[0090] The principle of equidistant winding structure is as follows: Figure 13 As shown, by setting the initial winding angles α and β and the winding shaft pitch P, where P is the winding shaft pitch, it can be ensured that α always equals β during the rotation of the winding shaft. When the angle between the first rope and the winding shaft is equal to the angle between the second rope and the winding shaft, because the lifting platform and the winding shaft have a helical fit and the lifting platform cannot rotate along the winding shaft, when the rotating body rotates one revolution (the winding shaft rotates simultaneously), the rope will increase or decrease by one revolution on the winding shaft, and the lifting platform will correspondingly rise or fall by one pitch. The two rotational states are as follows: Figure 14 As shown, when the sample to be driven on the load support plate needs to be finely adjusted in a certain direction, the rotation direction and rotation angle of the drive rotation drive drive the rotation of the rotating body. At this time, the first rope increases the number of rope windings and the second rope decreases the number of rope windings, so that the first lifting platform and the second lifting platform rise or fall synchronously. Thus, by the winding direction and winding angle around the winding axis, the displacement of the rope in the axial direction of the winding axis is realized, driving the movement of the first lifting platform and the second lifting platform, and finally driving the bidirectional movement of the sample to be driven on the load support plate.

[0091] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A linear drive device, characterized in that, It includes a base, a support plate, a rotating body, a first cable, a second cable, a first winding shaft, a second winding shaft, a first lifting platform, and a second lifting platform; One end of the first winding shaft is fixed to the rotating body, and the other end of the first winding shaft passes through the central through hole of the first lifting platform; one end of the second winding shaft is fixed to the rotating body, and the other end of the second winding shaft passes through the central through hole of the second lifting platform; the first winding shaft and the second winding shaft are arranged in a straight line. The first cable is wound around the first winding shaft, one end of the first cable is fixed to a preset position on the upper surface of the rotating body, and the other end of the first cable passes through the first through hole on the first lifting platform and is fixed to a preset position on the base; the second cable is wound around the second winding shaft, one end of the second cable is fixed to a preset position on the lower surface of the rotating body, and the other end of the second cable passes through the second through hole on the second lifting platform and is fixed to a preset position in the support plate.

2. The apparatus according to claim 1, characterized in that, It also includes a second support plate, the second support plate having a through hole in its center, and the rotating body is embedded in the through hole in the center of the second support plate.

3. The apparatus according to claim 2, characterized in that, It also includes a first guide shaft; One end of the first guide shaft is fixed to the base, and the other end of the first guide shaft is fixed to the support plate. The first guide shaft passes vertically through the third through hole in the first lifting platform, the fourth through hole in the second support plate, and the fifth through hole in the second lifting platform.

4. The apparatus according to claim 3, characterized in that, The number of the first guide shafts includes at least three.

5. The apparatus according to claim 2, 3, or 4, characterized in that, It also includes a load support plate, a drive assembly, a first transmission component, a drive shaft, and a second transmission component; The drive assembly is sequentially connected to the rotating body via the first transmission member, the transmission shaft, and the second transmission member. The drive assembly and the first transmission member are disposed on the load support plate, and the second transmission member is disposed on the second support plate.

6. The apparatus according to claim 5, characterized in that, The first transmission component includes a first driving wheel, a first driven wheel, and a first synchronous belt sleeved on the first driving wheel and the first driven wheel; the first driving wheel is connected to the drive assembly, and the first driven wheel is connected to one end of the transmission shaft; The second transmission component includes a second driving wheel, a second driven wheel, and a second synchronous belt sleeved on the second driving wheel and the second driven wheel; the second driving wheel is connected to the rotating body, and the second driven wheel is connected to the other end of the transmission shaft.

7. The apparatus according to claim 5, characterized in that, The driving component includes a rotary drive.

8. The apparatus according to claim 6, characterized in that, It also includes linear bearings and a second guide shaft; The linear bearing is fixed at the sixth through hole of the support plate; one end of the second guide shaft is fixed to the load support plate, the other end of the second guide shaft is fixed to the second support plate, and the second guide shaft passes through the linear bearing.

9. The apparatus according to claim 8, characterized in that, The number of the second guide shafts includes at least three.

10. The apparatus according to claim 1, characterized in that, The first cable includes a first rope, and the second cable includes a second rope.

Images