CN211820607U - Linear transmission device and supporting seat thereof - Google Patents

Abstract

A linear transmission device and a support seat thereof are provided. The moving part is arranged on the guide part. The supporting seat comprises a bearing platform and a flow passage, the bearing platform is provided with a top surface, the top surface is positioned below the long guide piece, a gap is kept between the long guide piece and the top surface, the top surface of the bearing platform is provided with a spray hole, the flow passage is communicated with the spray hole, and the spray hole sprays fluid towards the long guide piece to form a supporting film, and the gap is filled with the supporting film.

Description

Linear transmission device and supporting seat thereof

Technical Field

The utility model relates to a transmission, in particular to linear transmission and supporting seat thereof.

Background

Linear transmissions (e.g., linear slide, screw, spline, etc.) have been widely used in various precision machinery, power transmission, automation, semiconductor, medical, aerospace, and other industries.

Since the guides (e.g., linear rails, screws, or spline shafts) of the linear transmission have a certain length, they are easily bent and deformed, so that the corresponding moving member (e.g., a slider, a nut, or a sleeve) cannot move on a center line. In addition, for the screw, when the screw rotates at a high speed, the screw is also prone to shake or swing under the action of gravity and centrifugal force, which affects the operation precision of the linear transmission device and increases the abrasion and working temperature.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a linear transmission and a supporting base thereof, which can improve the working accuracy and stability of the linear transmission.

To achieve the above object, the present invention provides a linear transmission device, which includes:

an elongated guide member;

a moving member disposed on the long guide member; and

at least one supporting seat, including a bearing platform and a flow channel, the bearing platform has a top surface, the top surface is located below the long guiding member, and a gap is kept between the long guiding member and the top surface, the top surface of the bearing platform is provided with at least one jet orifice, the flow channel is communicated with the at least one jet orifice, the at least one jet orifice jets a fluid towards the long guiding member to form a supporting film, and the gap is filled with the supporting film.

In the linear transmission device, the long guide member has a circular cross section, and an axial length of the long guide member is more than 100 times a diameter length of the circular cross section.

The linear transmission device further includes a driving device, the driving device is connected to the at least one supporting seat, and the driving device is used for driving the at least one supporting seat to move away from or towards the long guiding element or move along with the moving element.

In the above-mentioned linear transmission device, the long guiding member is a long screw rod, and the long screw rod includes an outer spiral groove, and the outer spiral groove is disposed on the outer circumference of the long screw rod; the moving piece is a nut which is sleeved outside the long screw rod and can axially move relative to each other, the nut is provided with an inner ring surface, the inner ring surface is provided with an inner spiral groove channel, and the inner spiral groove channel and the outer spiral groove channel of the long screw rod correspond to each other.

In the linear transmission device, the long guide member is a spline shaft, the moving member is an outer sleeve, and the outer sleeve is sleeved outside the spline shaft and can axially move relative to the spline shaft.

In the above-mentioned linear transmission device, the at least one supporting seat includes a base, the base has a receiving groove, and the plummer is received in the receiving groove and can selectively approach or leave the long guiding member.

In the above-mentioned linear transmission device, the bearing table includes a bottom surface opposite to the top surface, and at least one gasket is disposed between the bottom surface and the base.

In the above-mentioned linear transmission device, the at least one supporting seat further includes a fixing member, and the fixing member fixes the plummer in the accommodating groove.

In the above-mentioned linear transmission device, the moving member has an axial opening, and the axial opening corresponds to the at least one supporting seat and does not touch each other.

In the above linear transmission device, the top surface of the bearing table is an arc surface.

In the above-mentioned linear transmission device, the at least one nozzle hole of the top surface is further provided with an atomizer.

In the above linear transmission device, the number of the at least one nozzle hole is plural, and the nozzle holes are arranged in at least one row along the axial direction of the long guide member.

The linear transmission device further includes a fluid supply device, the fluid supply device guides the fluid into the flow channel and ejects the fluid to the long guide member through the at least one nozzle hole, and the fluid is a liquid, a gas or a liquid-gas mixture fluid.

The linear transmission device further includes a fluid temperature controller connected to the fluid supply device for controlling the temperature of the fluid output by the fluid supply device.

In the above linear actuator, the flow channel has an inlet, and the inlet is connected to a flow controller.

In the above-mentioned linear transmission device, the number of the at least one supporting seat is more than two, and the flow channels of the supporting seats are connected in series or in parallel.

To achieve the above object, the present invention further comprises a support base for supporting a long guide of a linear transmission device, wherein the support base comprises:

a bearing table, which is provided with a top surface, wherein the top surface is positioned below the long guide piece, a gap is kept between the long guide piece and the top surface, and the top surface of the bearing table is provided with at least one spray hole; and

and the flow channel is communicated with the at least one jet hole, the at least one jet hole jets a fluid towards the long guide piece to form a support film, and the support film fills the gap.

In the above-mentioned supporting seat, the long guiding member has a circular cross section, and the axial length of the long guiding member is more than 100 times of the diameter length of the circular cross section.

The support seat is characterized in that a moving member is arranged on the long guide member, the long guide member is a long screw rod, the long screw rod comprises an outer spiral groove channel, and the outer spiral groove channel is arranged on the outer circumference of the long screw rod; the moving piece is a nut which is sleeved outside the long screw rod and can axially move relative to each other, the nut is provided with an inner ring surface, the inner ring surface is provided with an inner spiral groove channel, and the inner spiral groove channel and the outer spiral groove channel of the long screw rod correspond to each other.

In the above-mentioned supporting seat, a moving member is disposed on the long guiding member, the long guiding member is a spline shaft, the moving member is an outer sleeve, and the outer sleeve is sleeved outside the spline shaft and can move axially relative to each other.

To sum up, according to the utility model discloses linear transmission is equipped with the orifice towards long guide through each supporting seat, makes the clearance between long guide and the supporting seat can fill up and support the membrane to reach and support stable effect, avoid slender than too big long guide to take place the situation of whipping or rocking, thereby improve linear transmission's working accuracy and stability.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a perspective view of a first embodiment of the linear actuator of the present invention;

fig. 2 is an exploded perspective view of a first embodiment of the linear actuator of the present invention;

fig. 3 is a partially exploded perspective view of a first embodiment of the linear actuator of the present invention;

fig. 4 is a partial cross-sectional view of a first embodiment of the linear actuator of the present invention;

fig. 5 is another partial cross-sectional view of the first embodiment of the linear actuator of the present invention;

fig. 6 is a perspective view of a second embodiment of the linear actuator of the present invention;

fig. 7 is a partially exploded perspective view of a third embodiment of the linear actuator of the present invention;

fig. 8 is a partially exploded perspective view of a fourth embodiment of the linear actuator of the present invention;

fig. 9 is a perspective view of a fifth embodiment of the linear actuator of the present invention.

Wherein the reference numerals

1. 2: linear transmission device

10. 10' long guide

11, external spiral groove

12 outer circumference of the ring

A is the central axis

D diameter length

20. 20'. supporting seat

201 fixing part

21 bearing table

22 top surface

23 bottom surface

24: spray orifice

25: base

251 accommodating groove

26: flow channel

261 inlet

27 spacer

30. 30' moving part

31 axial cylinder

32 inner ring surface

33 inner spiral groove

34 axial opening

41 spacer

50 atomizer

60 fluid supply device

61 flow controller

62 fluid temperature controller

70 driving device

F fluid

M is a support film

T, T1-T3 pipeline

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

fig. 1 is the perspective view of the first embodiment of the linear transmission device of the present invention, fig. 2 is the exploded perspective view of the first embodiment of the linear transmission device of the present invention, fig. 3 is the partially exploded perspective view of the first embodiment of the linear transmission device of the present invention, fig. 4 is the partial cross-sectional view of the first embodiment of the linear transmission device of the present invention, fig. 5 is another partial cross-sectional view of the first embodiment of the linear transmission device of the present invention. As shown in fig. 1 to 5, the linear actuator 1 of the present embodiment includes an elongated guide 10, at least one support 20, and a moving member 30. In some embodiments, the linear drive 1 may be a slide rail device, a screw device, a spline device, or other linear drive.

As shown in fig. 1 to 5, in the present embodiment, the linear actuator 1 is a screw device, the long guide member 10 is a long screw and includes an outer spiral groove 11, the outer spiral groove 11 is disposed on an outer circumference 12 of the long guide member 10, and in the present embodiment, the outer spiral groove 11 is circumferentially formed along an axial direction of the long guide member 10 and is disposed at a desired pitch.

As shown in fig. 1 to 5, the linear actuator 1 includes a plurality of supporting seats 20, but this is not limited thereto, and in practical applications, one or more supporting seats 20 may be provided according to the length of the long guide 10. In some embodiments, the support seat 20 may be disposed according to the length of the long guide 10, for example, the support seat 20 is disposed only when the long guide 10 is longer than a certain length, taking fig. 1 and 5 as an example, the long guide 10 of the present embodiment is a long screw rod with a circular cross section, and the support seat 20 is disposed only when the axial length of the long guide 10 is more than 100 times of the diameter length D of the circular cross section, but the axial length of the long guide 10 is merely an example and is not limited thereto.

As shown in fig. 1 to 5, a plurality of support bases 20 are arranged at intervals along the axial direction of the long guide 10, each support base 20 includes a bearing platform 21 and a flow channel 26, the bearing platform 21 has a top surface 22 and a bottom surface 23, the top surface 22 is located below the long guide 10 but not fixed to the long guide 10, so that a gap is maintained between the long guide 10 and the top surface 22, the top surface 22 is provided with at least one spray hole 24, the flow channel 26 is connected to the spray hole 24, so that when external fluid is introduced into the flow channel 26, the external fluid can be sprayed out from the spray hole 24 to the long guide 10. In the present embodiment, the carrier 21 is elongated and extends along the axial direction of the long guide 10, the top surface 22 of the carrier 21 is provided with a plurality of injection holes 24, and the plurality of injection holes 24 are arranged at intervals along the axial direction of the long guide 10, where the plurality of injection holes 24 are linearly arranged in a row and face the central axis a of the long guide 10, but this is not a limitation, and in some embodiments, the plurality of injection holes 24 may also be arranged in multiple rows or in a non-linear manner.

As shown in fig. 1 to 5, in the embodiment, the supporting base 20 further includes a base 25, the base 25 can be fixed on the working surface of the linear transmission device 1, the base 25 has a receiving groove 251, and the supporting platform 21 is received in the receiving groove 251 to be fixed on the working surface through the base 25, so as to achieve the effect of supporting the long guiding element 10. However, the supporting base 20 may only include the bearing platform 21, and the bearing platform 21 is separately fixed on the working surface of the linear transmission device 1, so as to achieve the effect of supporting the long guide 10.

As shown in fig. 1 to 5, in the present embodiment, the flow channel 26 of each support base 20 is disposed inside the susceptor 21, wherein the flow channel 26 has an inlet 261 for introducing an external fluid from the inlet 261, for example, the inlet 261 of the flow channel 26 may be connected to a fluid supply device 60 (where the inlet 261 is connected to the fluid supply device 60 through a pipeline T), so that the fluid F is introduced into the flow channel 26 by the fluid supply device 60 and is ejected toward the elongated guide 10 through the plurality of nozzles 24. In some embodiments, the flow channel 26 may also be disposed outside the susceptor 21, and the embodiment is not limited thereto.

In addition, in some embodiments, the fluid supply device 60 may further incorporate a fluid temperature controller 62 to control the temperature of the fluid F, thereby increasing the cooling or warming efficiency of the linear actuator 1 and further improving the working performance.

In some embodiments, the fluid F may be a liquid, a gas, or a mixture of liquid and gas. For example, as shown in fig. 1 to 5, an atomizer 50 (e.g., a nozzle) is further disposed in each nozzle hole 24 of the top surface 22 of the susceptor 21, so as to generate a liquid-gas mixed fluid F through the atomizer 50 and eject the fluid F toward the long guide 10. In other embodiments, the fluid supply device 60 may directly introduce the atomized fluid F into the flow channel 26, and the atomizer 50 disposed in each nozzle hole 24 may be omitted.

Therefore, as shown in fig. 4 and 5, the linear transmission device 1 of the embodiment of the present invention is provided with a plurality of nozzles 24 facing the long guide 10 through each support seat 20, when the fluid F is guided into the flow channel 26, the fluid F can be sprayed out from the plurality of nozzles 24 toward the long guide 10 to form the support film M, and the support film M fills the gap between the long guide 10 and the support seat 20, so as to achieve the effect of stable support, avoid the situation that the long guide 10 with too large slenderness ratio swings or shakes, thereby improving the working accuracy and stability of the linear transmission device 1, and the support film M has the cooling and lubricating effect at the same time, and can reduce the wear of the long guide 10 and prolong the service life. For example, the fluid F ejected from the plurality of nozzles 24 toward the long guide 10 may be oil-water, pure atomized oil or oil-mist, and the fluid F has a predetermined temperature (e.g., 15 ℃, 20 ℃, or 25 ℃, depending on different environments or actual requirements) under the control of the fluid temperature controller 62, so that the gap between the long guide 10 and the support seat 20 is filled with a layer of the support film M, and thus, each support seat 20 can not only stably support the long guide 10, but also lubricate the surface of the long guide 10 to prevent the long guide 10 from being worn and prolong the service life, and the support film M having the predetermined temperature can further achieve the effect of cooling the long guide 10 to prevent the temperature difference from affecting the working accuracy of the linear actuator 1.

As shown in fig. 5, in the present embodiment, the top surface 22 of the carrier 21 is an arc surface to correspond to the shape of the outer circumference 12 of the long guide 10, so as to have a better supporting effect, and the supporting film M formed between the long guide 10 and the supporting base 20 is easier to be kept on the top surface 22 of the carrier 21, so as to reduce the overflow. In other embodiments, the top surface 22 of the susceptor 21 may have other shapes, which is not limited.

In some embodiments, the carrier 21 is further movably disposed in the receiving groove 251 of the base 25 and can selectively approach or depart from the long guide 10 to adjust the distance between the carrier 21 and the long guide 10 according to actual requirements, as shown in fig. 3 to 5, in this embodiment, a spacer 27 can be further disposed between the bottom surface 23 of the carrier 21 and the receiving groove 251 of the base 25 to adjust the distance between the carrier 21 and the long guide 10 according to different requirements.

Alternatively, as shown in fig. 1 to 4, the fluid supply device 60 may have a flow controller 61 to adjust the flow rate of the fluid F entering the flow passage 26 through the flow controller 61, thereby adjusting the distance between the carrier table 21 and the elongated guide 10. For example, in the present embodiment, the flow passages 26 of the plurality of support bases 20 are connected in series with each other through the pipeline T1, so that the flow rate controller 61 of the fluid supply device 60 can simultaneously adjust the flow rate of the fluid F entering the flow passages 26 of the plurality of support bases 20 to adjust the pressure of the fluid F sprayed out of the spray holes 24, thereby controlling the thickness of the support film M formed between the long guide 10 and the support bases 20 or the height position of the long guide 10.

Alternatively, as shown in fig. 6, the linear actuator of the present invention is a perspective view of a second embodiment. In the present embodiment, the flow passages 26 of the plurality of support bases 20 are connected in parallel to each other through the plurality of pipes T2, T3, so that the plurality of flow passages 26 are respectively connected to the fluid supply device 60, and therefore, the flow controller 61 of the fluid supply device 60 can respectively regulate the flow rate of the fluid F entering the plurality of flow passages 26, so that the pressure of the fluid F ejected from the plurality of ejection holes 24 of each support base 20 toward the long guide 10 can be consistent, so as to improve the smoothness of the long guide 10, or the pressure of the fluid F ejected from the plurality of ejection holes 24 of each support base 20 toward the long guide 10 can be respectively adjusted according to different use requirements (for example, the height position of each support base 20 has a slight difference), so as to change the thickness of the support film M formed between each support base 20 and the long guide 10, and further respectively adjust the distance between each susceptor 21 and the long guide 10.

Still alternatively, as shown in fig. 7, a partially exploded perspective view of a third embodiment of the linear actuator of the present invention is shown. In this embodiment, the supporting base 20 may include a plurality of fixing members 201 according to actual requirements, and the fixing members 201 may fix the supporting base 21 in the accommodating groove 251 of the base 25, where each fixing member 201 is a screw and is locked into the accommodating groove 251 from one side of the base 25 and abuts against one side of the supporting base 21 to achieve a fixing effect. In addition, at least one spacer 41 may be disposed between the bottom surface 23 and the base 25, so that when the distance between the platform 21 and the long guide 10 needs to be adjusted, the fixing member 201 may be detached from the base 25 and different numbers or thicknesses of the spacers 41 may be disposed between the bottom surface 23 and the base 25, so as to manually adjust the distance between the platform 21 and the long guide 10 of each support seat 20 according to actual requirements.

As shown in fig. 1 to 5, in the embodiment, the moving member 30 is a nut, the moving member 30 is disposed outside the elongated guide 10 and can move axially relative to each other, the moving member 30 includes an axial cylinder 31, the axial cylinder 31 has an inner annular surface 32, the inner annular surface 32 has an inner spiral groove 33, the inner spiral groove 33 is recessed in the inner annular surface 32 and is formed around along the axial direction of the moving member 30, the elongated guide 10 is a screw, and the inner spiral groove 33 of the moving member 30 and the outer spiral groove 11 of the elongated guide 10 correspond to each other and can be engaged with each other. Of course, the inner spiral groove 33 of the moving member 30 and the outer spiral groove 11 of the long guide member 10 correspond to each other, and a ball circulation passage can be formed between the two, wherein the ball circulation passage can accommodate a plurality of balls, so as to form a ball screw type linear transmission device, so that the long guide member 10 and the moving member 30 are in rolling contact state by the balls, thereby reducing friction force when the moving member 30 and the long guide member 10 perform relative movement, and thus reducing driving torque.

As shown in fig. 1 to 5, the linear actuator 1 further includes at least one driving device 70, for example, in the present embodiment, the linear actuator 1 includes a plurality of driving devices 70 respectively connected to the plurality of supporting bases 20, each driving device 70 is used for driving each supporting base 20 to move away from or approach the long guide 10, for example, each driving device 70 can respectively drive each supporting base 20 to move up and down or move away from or approach the long guide 10. For example, when the moving element 30 moves axially toward one of the supporting seats 20 relative to the long guide 10, the driving device 70 may drive the corresponding supporting seat 20 to temporarily separate from the long guide 10, so as to avoid the interference or impact between the moving element 30 and the supporting seat 20, and after the moving element 30 passes through the supporting seat 20, the driving device 70 drives the supporting seat 20 to approach the long guide 10, so as to restore the supporting seat 20 to the position supporting the long guide 10, thereby providing the supporting force required by the long guide 10. In other embodiments, the linear actuator 1 may also include only one driving device 70 to connect to the plurality of supporting seats 20, and the driving device 70 can drive each supporting seat 20 to move away from or approach the long guide 10.

In some embodiments, each driving device 70 may have a power source (e.g., a driving motor) and a transmission mechanism, for example, the transmission mechanism may be a gear transmission mechanism, a worm gear mechanism or a cam mechanism and is connected between the power source and each support seat 20, so as to drive each support seat 20 to move away from or towards the long guide 10 through the power source and the transmission mechanism. For the specific embodiment of the driving device 70, reference may be made to a worm and gear type lifting mechanism in the patent publication of china continental CN110394965A, a screw type lifting mechanism in the patent publication of china continental CN102515052A, or a roller type, spring type or pneumatic type lifting mechanism in new patent No. M322298 of china taiwan, and the detailed structural content is not repeated herein.

In some embodiments, the driving device 70 can also drive the supporting base 20 to move along with the moving member 30, so as to avoid interference or impact, for example, the supporting base 20 can be configured with a linear sliding rail structure to move along with the moving member 30. For the specific embodiment of the supporting base 20, reference is made to a rolling belt type moving mechanism of the new patent No. M565102 of taiwan, and the detailed structural content is not repeated herein.

As shown in fig. 8, which is a partially exploded perspective view of the fourth embodiment of the linear transmission device of the present invention, in some embodiments, the moving member 30 can also be an open nut, that is, the axial cylinder 31 of the moving member 30 further has an axial opening 34, and the axial opening 34 runs through two opposite ends of the axial cylinder 31 along the axial direction of the long guiding member 10, so as to form a C-shaped moving member 30, and the axial opening correspondingly avoids the supporting seat 20 and does not touch each other. Thereby, the moving member 30 can move on the long guide 10 and pass through the supporting seat 20 without interfering or colliding with the supporting seat 20. Therefore, through the design of the axial opening of the moving member 30, the device does not need to be provided with the driving device 70, so that the support base 20 can continuously maintain the state of supporting the long guide member 10, further, the manufacturing precision of the device can be prevented from being affected by the driving device 70 linking the support base 20, and the operation process can be simplified.

Fig. 9 is a perspective view of a fifth embodiment of the linear actuator of the present invention. The present embodiment is different from the embodiment of fig. 1 at least in that the linear transmission device 2 of the present embodiment is a spline device, the long guide 10 'is a spline shaft, the moving member 30' is an outer sleeve, and the moving member 30 'is sleeved outside the long guide 10' and can move axially relative to each other. A plurality of supporting seats 20' are supported below the long guide 10', wherein the supporting seats 20' have the same or similar structure as the supporting seats 20 of the above embodiments, and thus the description thereof is omitted.

To sum up, according to the utility model discloses linear transmission is equipped with the orifice towards long guide through each supporting seat, makes the clearance between long guide and the supporting seat can fill up and support the membrane to reach the stable effect of support, avoid slender ratio too big long guide to take place the situation of whipping or rocking, thereby improve linear transmission's working accuracy and stability, and support the membrane and have cooling and lubrication's effect simultaneously, can reduce long guide and take place wearing and tearing and improve life.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims (20)

1. A linear actuator, comprising:

an elongated guide member;

a moving member disposed on the long guide member; and

at least one supporting seat, including a bearing platform and a flow channel, the bearing platform has a top surface, the top surface is located below the long guiding member, and a gap is kept between the long guiding member and the top surface, the top surface of the bearing platform is provided with at least one jet orifice, the flow channel is communicated with the at least one jet orifice, the at least one jet orifice jets a fluid towards the long guiding member to form a supporting film, and the gap is filled with the supporting film.

2. The linear actuator of claim 1, wherein the elongated guide has a circular cross-section, and the axial length of the elongated guide is greater than 100 times the diametrical length of the circular cross-section.

3. The linear actuator of claim 1, further comprising a driving device connected to the at least one supporting seat, the driving device being configured to drive the at least one supporting seat to move away from or towards the elongated guide or move along with the moving member.

4. The linear actuator of claim 1, wherein the elongated guide is an elongated screw including an outer spiral groove provided on an outer circumference of the elongated screw; the moving piece is a nut which is sleeved outside the long screw rod and can axially move relative to each other, the nut is provided with an inner ring surface, the inner ring surface is provided with an inner spiral groove channel, and the inner spiral groove channel and the outer spiral groove channel of the long screw rod correspond to each other.

5. The linear actuator according to claim 1, wherein the elongated guide is a spline shaft, and the moving member is an outer sleeve which is fitted over the spline shaft and is capable of moving axially relative to each other.

6. The linear actuator according to claim 1, wherein the at least one supporting base includes a base having a receiving slot, and the supporting base is received in the receiving slot and is capable of selectively approaching or moving away from the elongated guide.

7. The linear actuator of claim 6, wherein the carrier includes a bottom surface opposite the top surface, and at least one spacer is disposed between the bottom surface and the base.

8. The linear actuator according to claim 6 or 7, wherein the at least one supporting seat further comprises a fixing member, and the fixing member fixes the supporting platform in the accommodating groove.

9. The linear actuator according to claim 1, wherein the moving member has an axial opening corresponding to the at least one supporting seat and not touching each other.

10. The linear actuator of claim 1, wherein the top surface of the carrier is a circular arc.

11. The linear actuator of claim 1, wherein the at least one nozzle hole of the top surface is further provided with an atomizer.

12. The linear actuator of claim 1, wherein the at least one nozzle hole is plural in number, and the nozzle holes are arranged in at least one row along the axial direction of the long guide.

13. The linear actuator of claim 1, further comprising a fluid supply device, the fluid supply device introducing the fluid into the flow channel and ejecting the fluid toward the elongated guide member through the at least one ejection hole, the fluid being a liquid, a gas or a mixture of liquid and gas.

14. The linear actuator of claim 13, further comprising a fluid temperature controller connected to the fluid supply device for controlling the temperature of the fluid output by the fluid supply device.

15. The linear actuator of claim 1, wherein the flow path has an inlet connected to a flow controller.

16. The linear actuator according to claim 1, wherein the number of the at least one supporting seat is two or more, and the flow passages of the supporting seats are connected in series or in parallel with each other.

17. A support base for supporting an elongated guide of a linear actuator, the support base comprising:

a bearing table, which is provided with a top surface, wherein the top surface is positioned below the long guide piece, a gap is kept between the long guide piece and the top surface, and the top surface of the bearing table is provided with at least one spray hole; and

and the flow channel is communicated with the at least one jet hole, the at least one jet hole jets a fluid towards the long guide piece to form a support film, and the support film fills the gap.

18. The seat assembly of claim 17, wherein the elongated guide has a circular cross-section, and the axial length of the elongated guide is greater than 100 times the diameter of the circular cross-section.

19. The cradle of claim 17, wherein the elongated guide member is provided with a moving member, the elongated guide member being an elongated screw, the elongated screw including an outer spiral groove formed in an outer circumference thereof; the moving piece is a nut which is sleeved outside the long screw rod and can axially move relative to each other, the nut is provided with an inner ring surface, the inner ring surface is provided with an inner spiral groove channel, and the inner spiral groove channel and the outer spiral groove channel of the long screw rod correspond to each other.

20. The mount according to claim 17 wherein the elongated guide member is provided with a moving member, the elongated guide member is a spline shaft, and the moving member is an outer sleeve that is fitted over the spline shaft and is capable of moving axially relative to each other.

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