Linear driving device and heliostat thereof

Abstract

The linear driving device comprises a device body, a telescopic assembly and a sealing assembly, the telescopic assembly is arranged in the device body in a penetrating mode, one end of the device body is open so that the telescopic assembly can stretch out, and the sealing assembly is arranged at the open end of the device body; the sealing assembly comprises a first sealing unit, a second sealing unit and a connecting unit, the first sealing unit is connected with the device body, and the second sealing unit is arranged on the side, away from the device body, of the first sealing unit and arranged on the telescopic assembly extending out of the device body in a sleeving mode. The first sealing unit and the second sealing unit are both in sliding sealing connection with the telescopic assembly. The connecting unit is configured to connect the second sealing unit to the first sealing unit, the first sealing unit is configured to seal a gap between the telescopic assembly and the device body through sliding sealing connection between the first sealing unit and the telescopic assembly, and the second sealing unit is configured to seal the adjacent position between the first sealing unit and the telescopic assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a linear drive device and a heliostat thereof. Background Art

[0002] Solar energy is increasingly used as a clean and renewable energy source, especially solar thermal power generation technology, which is an emerging solar energy utilization technology after photovoltaic power generation technology. Solar thermal power generation technology has attracted widespread attention due to its high power generation quality, small impact on the power grid, and energy storage. The heliostat adjusts the elevation angle and azimuth angle of the heliostat according to the movement trajectory of the sun to accurately focus the sunlight on the heat absorber. The adjustment of the elevation angle of the heliostat is performed by the elevation drive device. When the sun rises, the elevation drive device starts to extend, and when the sun sets, the elevation drive device starts to recover, and then stays in the zero position until the sun rises the next morning and then operates again.

[0003] At present, solar thermal power generation projects are mainly concentrated in the northwest region. The temperature in the winter morning is relatively low. After a night, the front seal of the elevation drive device and its telescopic tube are often frozen together, resulting in the failure of the elevation drive device to start or the damage of its sealing components by hard start. Summary of the invention

[0004] To solve the above problems, the object of the present invention is to provide a linear drive device and a heliostat thereof, which can ensure that the linear drive device starts normally in the cold morning to ensure that the heliostat can reliably track the sun.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A linear drive device comprises a device body, a telescopic assembly and a sealing assembly, wherein the telescopic assembly is inserted into the device body, one end of the device body is open for the telescopic assembly to extend, the sealing assembly is arranged at the open end of the device body, and the telescopic assembly is inserted into the sealing assembly;

[0007] The sealing assembly comprises a first sealing unit, a second sealing unit and a connecting unit, wherein the first sealing unit is connected to the device body, the second sealing unit is arranged on a side of the first sealing unit away from the device body and sleeved on the telescopic assembly extending from the device body, and the first sealing unit and the second sealing unit are both slidably and sealingly connected to the telescopic assembly;

[0008] The connecting unit is configured to connect the second sealing unit to the first sealing unit, and the connecting unit includes a first connecting portion and a second connecting portion respectively arranged on the first sealing unit and the second sealing unit, and there is a relative connecting force between the first connecting portion and the second connecting portion, and the second sealing unit is connected to the first sealing unit by the connecting force, and the first connecting portion and the second connecting portion can overcome the connecting force and move away from each other by an external force.

[0009] Preferably, the first sealing unit comprises a first end seat and a first sealing ring, the first end seat is mounted on the device body, the first sealing ring is sandwiched between the first end seat and the telescopic assembly, and the telescopic assembly is penetrated by the first sealing ring;

[0010] Wherein, the first sealing ring is configured to seal a gap between the first end seat and the telescopic assembly.

[0011] Preferably, a sealing ring is sandwiched between the first end seat and the device body, and the sealing ring is configured to seal the gap between the first end seat and the device body.

[0012] Preferably, the second sealing unit comprises a second end seat and a second sealing ring, the second end seat is arranged on a side of the first sealing unit away from the device body, the second sealing ring is sandwiched between the second end seat and the telescopic assembly, and the telescopic assembly is penetrated by the second sealing ring;

[0013] Wherein, the second sealing ring is configured to seal a gap between the second end seat and the telescopic assembly.

[0014] Preferably, a sealing member is provided on one end of the first sealing unit facing the second sealing unit, and / or on one end of the second sealing unit facing the first sealing unit.

[0015] Preferably, the connecting unit is a magnetic unit, and the connecting force is a magnetic force.

[0016] Preferably, the first connecting portion of the magnetic attraction unit is a first magnetic ring, the second connecting portion is a second magnetic ring, and the first magnetic ring and the second magnetic ring are both sleeved on the telescopic component.

[0017] Preferably, a first mounting groove is provided on a side of the first sealing unit facing the second sealing unit, a second mounting groove is provided on a side of the second sealing unit facing the first sealing unit, and the first magnetic ring and the second magnetic ring are respectively provided in the first mounting groove and the second mounting groove;

[0018] The first magnetic ring is threadedly connected to the first sealing unit, and the second magnetic ring is threadedly connected to the second sealing unit.

[0019] Preferably, the telescopic assembly includes a screw, a nut and an inner tube, the inner tube extends out of the device body and is slidably connected to the first sealing unit, the nut is fixedly connected to the inner tube, the screw is threadedly connected to the nut, and the rotation of the screw drives the inner tube to telescopic movement.

[0020] A heliostat for photothermal power generation, comprising the linear drive device described in any one of the above technical solutions.

[0021] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0022] The patented technology proposed in this invention significantly improves the startup reliability and operation stability of the heliostat linear drive device in low-temperature morning environments by innovatively designing the sealing component structure. This technology cleverly decomposes the sealing component into a first sealing unit, a second sealing unit, and a connecting unit. This design effectively solves the problem that the traditional sealing structure freezes together with the telescopic component due to condensation of rain or water vapor under low-temperature conditions, thereby hindering the normal operation of the telescopic component.

[0023] Specifically, the first sealing unit is responsible for sealing the main body of the device, effectively preventing external moisture and dust from entering the device, and providing necessary protection for the precision mechanical structure of the heliostat. The second sealing unit is specially designed to seal the adjacent area between the first sealing unit and the telescopic assembly. This additional layer of protection ensures that even in the morning with extremely low temperatures and high humidity, moisture cannot penetrate into the key area that directly affects the operation of the telescopic assembly, thereby avoiding the first sealing unit and the telescopic assembly from freezing together.

[0024] More importantly, the present invention connects the first sealing unit and the second sealing unit through a connecting unit. This design not only maintains the integrity of the sealing system, but also gives it a certain flexibility. Even in the case of freezing between the second sealing unit and the telescopic component due to low temperature, the telescopic component can still rely on its own driving force to overcome the moderate connection force set by the connecting unit during startup and operation, and drive the second sealing unit to move synchronously, ensuring that the stability of the entire device is not affected. As the ambient temperature naturally rises, the freezing phenomenon is lifted, and the second sealing unit can automatically reset with the help of the connecting force of the connecting unit and continue to play its sealing role without manual intervention, which greatly enhances the self-adaptability and maintenance convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of a solar thermal power station of the present invention;

[0027] Figure 2 This is a front view of the heliostat of the present invention;

[0028] Figure 3 This is an axonometric diagram of the heliostat of the present invention;

[0029] Figure 4 A partial schematic diagram of the heliostat of the present invention Figure 1 ;

[0030] Figure 5 A partial schematic diagram of the heliostat of the present invention Figure 2 ;

[0031] Figure 6 It is a schematic diagram of the linear drive device of the present invention;

[0032] Figure 7 It is a cross-sectional view of the linear drive device of the present invention;

[0033] Figure 8 This is a schematic diagram of the first sealing unit and the second sealing unit of the present invention being combined together;

[0034] Fig. 9 This is a schematic diagram of the first sealing unit and the second sealing unit being separated from each other;

[0035] Fig.10 It is a schematic diagram of the second end seat of the present invention;

[0036] Description of reference numerals:

[0037] 1. Reflecting mirror surface; 2. Mirror frame; 3. Connecting seat; 4. Linear drive device; 21. Main beam body; 22. Push rod support seat; 23. Rotating shaft support seat; 31. Connecting seat body; 32. Rotating shaft; 33. Connecting seat connector; 34. First latch; 41. Sealing assembly; 42. Cylinder body; 43. Telescopic assembly; 44. Transmission mechanism; 4111. Second end seat; 4112. Second sealing ring; 4113. Second magnetic ring; 4121. First end seat; 41211. Push rod adapter; 4122. First sealing ring; 4123. First magnetic ring; 4124. Sealing ring; 4125. Sealing cover; 431. Inner tube; 4311. Push rod joint. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and use inaccurate ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] Example 1

[0041] See also Figures 1 to 10 The core of the present invention is to provide a linear drive device 4, including a device body, a telescopic component 43 and a sealing component 41. The telescopic component 43 is penetrated in the device body, one end of the device body is open for the telescopic component 43 to extend out, the sealing component 41 is arranged at the open end of the device body, and the telescopic component 43 penetrates the sealing component 41.

[0042] The sealing assembly 41 includes a first sealing unit, a second sealing unit and a connecting unit. The first sealing unit is connected to the device body. The second sealing unit is arranged on the side of the first sealing unit away from the device body and is sleeved on the telescopic assembly extending out of the device body. The first sealing unit and the second sealing unit are both connected to the telescopic assembly 43 in a sliding and sealing manner.

[0043] The connecting unit is configured to connect the second sealing unit to the first sealing unit. The connecting unit includes a first connecting portion and a second connecting portion which are respectively arranged on the first sealing unit and the second sealing unit. There is a relative connecting force between the first connecting portion and the second connecting portion. The second sealing unit is connected to the first sealing unit through the connecting force, and the first connecting portion and the second connecting portion can be moved away from each other by overcoming the connecting force through external force.

[0044] The sealing component 41 is decomposed into a first sealing unit, a second sealing unit and a connecting unit. This design effectively solves the problem that the traditional sealing structure is frozen together with the telescopic component 43 due to condensation of rain or water vapor under low temperature conditions, thereby hindering the normal operation of the telescopic component 43.

[0045] Specifically, the first sealing unit is responsible for sealing the main body of the device, effectively preventing external moisture and dust from invading the interior of the device, and providing necessary protection for the precision mechanical structure of the heliostat. The second sealing unit is specially designed to seal the adjacent area between the first sealing unit and the telescopic assembly 43. This additional layer of protection ensures that even in the morning with extremely low temperatures and high humidity, moisture cannot penetrate into the key area that directly affects the operation of the telescopic assembly 43, thereby avoiding the first sealing unit and the telescopic assembly 43 from freezing together.

[0046] More importantly, the present invention connects the first sealing unit and the second sealing unit through a connecting unit. This design not only maintains the integrity of the sealing system, but also gives it a certain flexibility. Even in the case where freezing occurs between the second sealing unit and the telescopic component 43 due to low temperature, the telescopic component 43 can still rely on its own driving force to overcome the moderate connection force set by the connecting unit during startup and operation, and drive the second sealing unit to move synchronously to ensure that the stability of the entire device is not affected. As the ambient temperature naturally rises, the freezing phenomenon is lifted, and the second sealing unit can automatically reset with the help of the connecting force of the connecting unit and continue to play its sealing role without manual intervention, which greatly enhances the self-adaptability and maintenance convenience of the device.

[0047] Specifically, the first sealing unit includes a first end seat 4121 and a first sealing ring 4122. The first end seat 4121 is installed on and connected to the device body. The first sealing ring 4122 is clamped between the first end seat 4121 and the telescopic assembly. The telescopic assembly 43 is penetrated and connected to the first sealing ring 4122 in a sliding sealing manner. The first sealing ring 4122 has an interference fit with the outer walls of the first end seat 4121 and the telescopic assembly 43. The first sealing ring 4122 is configured to seal the gap between the first end seat 4121 and the telescopic assembly.

[0048] Specifically, one end of the first end seat 4121 is penetrated and threadedly connected to the device body, and a sealing ring 4124 is sandwiched between the inner wall of the device body. The sealing ring 4124 is specifically an O-ring. The sealing ring 4124 is installed in the stop ring groove of the first end seat 4121, and is used to seal the gap between the first end seat 4121 and the device body.

[0049] The second sealing unit includes a second end seat 4111 and a second sealing ring 4112. The second end seat 4111 is disposed on a side of the first sealing unit away from the device body. The second sealing ring clamp 4112 is disposed between the second end seat 4111 and the telescopic assembly. The telescopic assembly 43 is penetrated and slidably sealed to the second sealing ring 4112. The second sealing ring 4112 is interference fit with the outer wall of the second end seat 4111 and the telescopic assembly 43. The second sealing ring 4111 is configured to seal the gap between the second end seat 4111 and the telescopic assembly.

[0050] A sealing member is provided on one end of the first end seat 4121 facing the second end seat 4111, and / or on one end of the second end seat 4111 facing the first end seat 4121. In this embodiment, the sealing member is a sealing cover 4125, and is provided on the first end seat 4121. Specifically, a through hole is provided in the middle of the sealing cover 4125, and the sealing cover 4125 is sleeved on the first end seat 4121 through the through hole. The front side of the sealing cover 4125 is located on one end of the first end seat 4121 facing the second end seat 4111, and the side of the sealing cover 4125 is located on the side wall of the first end seat 4121.

[0051] The first sealing ring 4122 , the second sealing ring 4112 , the sealing cover 4125 and the sealing ring 4124 are all made of sealing materials such as rubber or silicone.

[0052] The connection unit is a magnetic unit, and the connection force is a magnetic force. Specifically, the first connection part and the second connection part of the magnetic unit are respectively a first magnetic ring 4123 and a second magnetic ring 4113, and the first magnetic ring 4123 and the second magnetic ring 4113 are both sleeved on the telescopic component 43. Of course, in other embodiments, the connection unit can also be an elastic member such as a spring or an elastic rope.

[0053] A first mounting groove is provided on one side of the first end seat 4121 facing the second end seat 4111, and a second mounting groove is provided on one side of the second end seat 4111 facing the first end seat 4121. The first magnetic ring 4123 and the second magnetic ring 4113 are respectively provided in the first mounting groove and the second mounting groove. The first magnetic ring 4123 is threadedly connected to the first end seat 4121, and the second magnetic ring 4113 is threadedly connected to the second end seat 4111.

[0054] A first fixing bolt and a second fixing bolt are respectively provided on adjacent ends of the first end seat 4121 and the second end seat 4111. The heads of the first fixing bolt and the second fixing bolt respectively restrict the first magnetic ring 4123 and the second magnetic ring 4113 in the first mounting groove and the second mounting groove. The first fixing bolt and the second fixing bolt can restrict the axial freedom of the first magnetic ring 4123 and the second magnetic ring 4113.

[0055] The first magnetic ring 4123 and the second magnetic ring 4113 are arranged face to face and attract each other. The axial suction force between the two is greater than the friction force generated by the interference fit between the second sealing ring 4112 and the inner tube 431. When the distance between the first sealing unit and the second sealing unit is within the suction range of the two, the second sealing unit can be adsorbed and slid axially along the inner tube 431, so that the second end seat 4111 and the first end seat 4121 fit together. The axial suction force between the first magnetic ring 4123 and the second magnetic ring 4113 is less than the rated push-pull force of the linear drive device 4, and the axial suction force between the first magnetic ring 4123 and the second magnetic ring 4113 is less than the resistance of the second sealing ring 4112 and the inner tube 431 freezing together.

[0056] In this embodiment, the device body includes a cylinder body 42, one end of which is open, and a telescopic assembly 43 is disposed in the cylinder body 42. The telescopic assembly 43 includes a lead screw, a nut, and an inner tube 431. The inner tube 431 extends out of the device body and is slidably connected to the first sealing unit. The nut is fixedly connected to the inner tube 431, and the lead screw is threadedly connected to the nut. The rotation of the lead screw drives the inner tube 431 to telescope.

[0057] The transmission mechanism 44 is also included, which is used to drive the lead screw to rotate. The transmission mechanism 44 includes a worm wheel, a worm, and a motor. The motor and the worm are connected through a coupling, and the electric energy of the motor is converted into kinetic energy and transmitted to the worm. The worm wheel is meshed with the worm, and the worm wheel is connected to the lead screw. The rotation of the worm drives the worm wheel to rotate, and the rotation of the worm wheel drives the lead screw to rotate.

[0058] The working process of the present invention is further described below:

[0059] like Figure 8 As shown, before the linear drive device 4 is driven, the first sealing unit and the second sealing unit are attached together due to the mutual attraction between the first magnetic ring 4123 and the second magnetic ring 4113 .

[0060] like Fig.10 As shown, the end faces of the first end seat 4121 and the second end seat 4111 are sealed by a sealing cover 4125, and the second sealing ring 4112 is combined to seal the internal space formed by the first end seat 4121 and the second end seat 4111. The first sealing ring 4122 is in the internal space, so in winter, although the temperature is low in the morning, the first sealing ring 4122 will not freeze together with the inner tube 431. However, the second sealing ring 4112 is exposed to the air, and there is humidity in the air, so the second sealing ring 4112 and the outer circumferential surface of the inner tube 431 are frozen together.

[0061] Because the axial suction force between the first magnetic ring 4123 and the second magnetic ring 4113 is smaller than the rated push-pull force of the linear drive device 4, and the axial suction force between the first magnetic ring 4123 and the second magnetic ring 4113 is smaller than the resistance of the second sealing ring 4112 and the inner tube 431 frozen together, when the linear drive device 4 is started, the cylinder body 42 drives the first sealing unit to move axially relative to the inner tube 431, and separates the first sealing unit from the second sealing unit, thereby ensuring the normal operation of the linear drive device 4 and avoiding the linear drive device 4 from failing to start or damaging the second sealing ring 4112 by hard starting.

[0062] When the temperature rises, the second sealing ring 4112 and the inner tube 431 are thawed, and the distance between the first sealing unit and the second sealing unit is within the axial suction range of the first magnetic ring 4123 and the second magnetic ring 4113, the second sealing unit slides axially along the inner tube 431, so that the front second end seat 4111 fits with the first end seat 4121, and the original posture of the linear drive device 4 is restored.

[0063] Example 2

[0064] See also Figures 1 to 10 Another core of the present invention is to provide a heliostat for solar thermal power generation, including the linear drive device 4 described in Example 1, and the linear drive device 4 is configured to control the elevation angle of the heliostat.

[0065] The heliostat includes a reflective mirror surface 1, a mirror frame 2, a connecting seat 3, a linear drive device 4, a rotary drive device, a column and other components. The column is arranged on the ground, the rotary drive device is arranged on the top of the column, the connecting seat 3 is arranged on the rotary drive device, the reflective mirror surface 1 is arranged on the mirror frame 2, and the mirror frame 2 is arranged on the connecting seat 3. The linear drive device 4 is connected to the connecting seat 3 through a push rod joint 4311, and is connected to the mirror frame 2 through a rear end head. The linear drive device 4 drives the mirror frame 2 to rotate by moving the push rod joint 4311 relative to the rear end head. The linear drive device 4 provided by the present invention can adjust the elevation angle of the heliostat as the position of the sun changes, and most reliably reflect sunlight to the heat absorption tower.

[0066] The mirror frame 2 comprises a main beam body 21 , a push rod support seat 22 , and a rotation shaft 32 support seat 23 . The push rod support seat 22 and the rotation shaft 32 support seat 23 are respectively arranged on the main beam body 21 .

[0067] The connecting seat 3 includes a connecting seat body 31, a rotating shaft 32, a connecting seat connector 33, and a push rod connector. The rotating shaft 32 is rotatably connected to the connecting seat body 31. A connecting seat connector 33 is respectively provided at both ends of the rotating shaft 32. The connecting seat connector 33 can specifically be a flange, etc.

[0068] The rotating shaft 32 supporting seat 23 includes two rotating shaft supports. The rotating shaft 32 is arranged between the two rotating shaft supports and connected to the two rotating shaft supports through a connecting seat connector 33 so that the main beam body 21 is rotatably connected to the connecting seat body 31.

[0069] The push rod connecting piece includes two lugs and a first pin 34. The push rod joint 4311 is arranged at one end of the inner tube 431 away from the cylinder body 42. The push rod joint 4311 is arranged between the two lugs. The push rod joint 4311 is a solid structure and is provided with a connecting hole. The first pin 34 is passed through the two lugs and the push rod joint 4311 to enable the linear drive device 4 to be hinged with the connecting seat body 31.

[0070] A push rod adapter 41211 is provided on the first end seat 4121, and second pin shafts are provided on both sides of the push rod adapter 41211. The push rod support seat 22 includes two push rod supports. The push rod adapter 41211 is provided between the two push rod supports and is hinged to the push rod supports through the second pin shaft, so that the linear drive device 4 is hinged to the main beam body 21.

[0071] The heliostat for solar thermal power generation and the linear drive device thereof provided by the present invention and the above-mentioned embodiments can ensure that the heliostat can track the sun with high precision at its elevation angle while allowing the linear drive device 4 to work more reliably and with a longer service life.

[0072] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A linear drive device, characterized in that: The device comprises a device body, a telescopic component and a sealing component, wherein the telescopic component is inserted into the device body, one end of the device body is open for the telescopic component to extend out, the sealing component is arranged at the open end of the device body, and the telescopic component is inserted into the sealing component; The sealing assembly comprises a first sealing unit, a second sealing unit and a connecting unit, wherein the first sealing unit is connected to the device body, the second sealing unit is arranged on a side of the first sealing unit away from the device body and sleeved on the telescopic assembly extending from the device body, and the first sealing unit and the second sealing unit are both slidably and sealingly connected to the telescopic assembly; The connecting unit is configured to connect the second sealing unit to the first sealing unit, and the connecting unit includes a first connecting portion and a second connecting portion respectively arranged on the first sealing unit and the second sealing unit, and there is a relative connecting force between the first connecting portion and the second connecting portion, and the second sealing unit is connected to the first sealing unit by the connecting force, and the first connecting portion and the second connecting portion can overcome the connecting force and move away from each other by an external force.

2. The linear drive device according to claim 1, characterized in that: The first sealing unit comprises a first end seat and a first sealing ring, wherein the first end seat is mounted on the device body, the first sealing ring is sandwiched between the first end seat and the telescopic assembly, and the telescopic assembly is penetrated by the first sealing ring; Wherein, the first sealing ring is configured to seal a gap between the first end seat and the telescopic assembly.

3. The linear drive device according to claim 2, characterized in that: A sealing ring is sandwiched between the first end seat and the device body, and the sealing ring is configured to seal the gap between the first end seat and the device body.

4. The linear drive device according to claim 1, characterized in that: The second sealing unit comprises a second end seat and a second sealing ring, wherein the second end seat is arranged on a side of the first sealing unit away from the device body, the second sealing ring is sandwiched between the second end seat and the telescopic assembly, and the telescopic assembly is penetrated by the second sealing ring; Wherein, the second sealing ring is configured to seal a gap between the second end seat and the telescopic assembly.

5. The linear drive device according to claim 1, characterized in that: A sealing member is provided on one end of the first sealing unit facing the second sealing unit, and / or on one end of the second sealing unit facing the first sealing unit.

6. The linear drive device according to claim 1, characterized in that: The connecting unit is a magnetic unit, and the connecting force is a magnetic force.

7. The linear drive device according to claim 6, characterized in that: The first connection portion of the magnetic attraction unit is a first magnetic ring, the second connection portion is a second magnetic ring, and the first magnetic ring and the second magnetic ring are both sleeved on the telescopic component.

8. The linear drive device according to claim 7, characterized in that: A first mounting groove is provided on a side of the first sealing unit facing the second sealing unit, a second mounting groove is provided on a side of the second sealing unit facing the first sealing unit, and the first magnetic ring and the second magnetic ring are respectively provided in the first mounting groove and the second mounting groove; The first magnetic ring is threadedly connected to the first sealing unit, and the second magnetic ring is threadedly connected to the second sealing unit.

9. The linear drive device according to claim 1, characterized in that: The telescopic assembly includes a lead screw, a nut and an inner tube. The inner tube extends out of the device body and is slidably connected to the first sealing unit. The nut is fixedly connected to the inner tube. The lead screw is threadedly connected to the nut. The rotation of the lead screw drives the inner tube to telescope.

10. A heliostat for solar thermal power generation, characterized in that: It comprises a linear drive device as described in any one of claims 1 to 9.

Images