Linear drive device and heliostat

Abstract

The utility model provides a kind of linear drive device and heliostat, linear drive device includes: shell;Execution component, including rotary lever, rotary lever is rotatably arranged in shell;Output assembly, output assembly is installed in shell, rotary lever is driven connection with output assembly, rotary lever can drive output assembly to move along the extension direction of the axis of rotary lever;Axial limit structure, installed on rotary lever, axial limit structure is configured to cooperate shell to limit the axial movement of rotary lever;Elastic structure, set in shell, elastic structure acts on axial limit structure, elastic structure is configured to apply pre-tightening force along the axial direction of rotary lever to axial limit structure. Through the technical scheme provided by the utility model, the problem that the transmission precision of equipment is reduced due to the looseness of screw rod caused by vibration, impact and long-term load effect in equipment operation in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of linear drive devices, and more specifically, to a linear drive device and a heliostat. Background Technology

[0002] A linear drive is an electric drive device that converts the rotary motion of an electric motor into the linear reciprocating motion of a push rod. It can be used as an actuator in various simple or complex processes to achieve remote, centralized, or automatic control. Typically, the electric motor in a linear drive is reduced in speed by gears or worm gears, and then drives a pair of lead screw nuts via a lead screw; thus converting the motor's rotary motion into linear motion, the forward and reverse rotation of the motor completes the push rod action.

[0003] However, in practical applications, the lead screw connection points in linear drive devices are often at risk of loosening due to vibration, impact, and long-term load during equipment operation. Loosening of the lead screw not only leads to a decrease in the transmission accuracy of the equipment but may also cause equipment failure, increase maintenance costs, and result in production losses.

[0004] Therefore, it is urgent to study a linear drive device and a heliostat to solve the above problems. Utility Model Content

[0005] This invention provides a linear drive device and a heliostat to solve the problem in the prior art where the lead screw in the linear drive device is prone to loosening due to vibration, impact and long-term load during equipment operation, resulting in a decrease in the transmission accuracy of the equipment.

[0006] In one aspect of this utility model, a linear drive device is provided, the linear drive device comprising:

[0007] case;

[0008] An actuating component includes a rotating rod rotatably disposed within the housing;

[0009] An output component is installed in the housing, and a rotating rod is driven to the output component, which can drive the output component to move along the extension direction of the axis of the rotating rod.

[0010] An axial limiting structure is installed on the rotating rod, and the axial limiting structure is configured to cooperate with the housing to limit the axial movement of the rotating rod;

[0011] An elastic structure is disposed in the housing, the elastic structure acts on the axial limiting structure, and the elastic structure is configured to apply a preload force along the axial direction of the rotating rod to the axial limiting structure.

[0012] Furthermore, the axial limiting structure includes a first nut, which is sleeved on the outer circumference of the rotating rod and threadedly connected to the rotating rod. The elastic structure acts on the first nut to apply a preload force along the axial direction of the rotating rod to the first nut.

[0013] Furthermore, the axial limiting structure also includes a second nut, which is sleeved on the outer circumference of the rotating rod and threadedly connected to it. The second nut is located on the side of the first nut away from the elastic structure.

[0014] The elastic structure is configured to apply a preload force to the first nut and the second nut along the axial direction of the rotating rod 21.

[0015] Furthermore, the axial limiting structure also includes at least one first fastener. At least one first through hole is provided on the circumferential sidewall of the first nut. The first fastener is provided in a one-to-one correspondence with the first through hole. The first through hole passes through the first nut radially. The first fastener passes through the first through hole and abuts against the rotating rod to fix the axial relative position of the first nut and the rotating rod; and / or,

[0016] The axial limiting structure further includes at least one second fastener. At least one second through hole is provided on the circumferential side wall of the second nut. The second fastener is provided in a one-to-one correspondence with the second through hole. The second through hole passes through the second nut radially. The second fastener passes through the second through hole and abuts against the rotating rod to fix the relative axial position of the second nut and the rotating rod.

[0017] Furthermore, the linear drive device also includes a limiting component, which is mounted on the outer periphery of the rotating rod and rotates synchronously with the rotating rod; wherein,

[0018] The limiting component is configured to restrict the elastic structure from moving away from the axial limiting structure.

[0019] Furthermore, the limiting component abuts against one end of the elastic structure away from the axial limiting structure, and the limiting component includes:

[0020] A limiting piece is sleeved on the outer periphery of the rotating rod. The limiting piece is located at the end of the elastic structure away from the axial limiting structure and abuts against the elastic structure.

[0021] A stop member is sleeved on the outer periphery of the rotating rod. The stop member is located at the end of the limiting piece away from the axial limiting structure. The stop member is used to fix the relative position of the limiting piece to the axial direction of the rotating rod.

[0022] A limiting groove is annularly disposed on the rotating rod. The limiting groove is correspondingly disposed with the stop member. At least part of the stop member is located in the limiting groove and is engaged with the limiting groove along the axial direction of the rotating rod.

[0023] Furthermore, the elastic structure is a disc spring or a spring.

[0024] Furthermore, the housing includes a first outer shell, a middle component, and a second outer shell, with the rotating rod passing through the middle component and rotatably connected to it;

[0025] Along the extension direction of the axis of the rotating rod, the first housing is installed on one side of the middle component, and the first housing is connected to the middle component by a third fastener;

[0026] Along the extension direction of the axis of the rotating rod, the second housing is mounted on the other side of the central member, and the second housing is connected to the central member by a fourth fastener.

[0027] Furthermore, the rotating rod is divided into a front section, a middle section, and a rear section along the axial direction;

[0028] The front section of the rotating rod is driven to connect to the output component, which is installed in the second housing;

[0029] The middle section of the rotating rod passes through the middle component and is rotatably connected to the middle component. Both the axial limiting structure and the elastic structure are sleeved on the outer periphery of the middle section.

[0030] Along the extension direction of the axis of the rotating rod, both the axial limiting structure and the elastic structure are located on the side of the central component facing the first outer shell.

[0031] Furthermore, the actuating component includes a first bearing, a second bearing, a third bearing, and a support sleeve;

[0032] The third bearing is sleeved on the middle section of the rotating rod, and the third bearing is disposed between the rotating rod and the middle component;

[0033] The first bearing is sleeved on the middle section of the rotating rod, and the first bearing is disposed between the rotating rod and the axial limiting structure;

[0034] The radius of the cross-section of the front section of the rotating rod is larger than the radius of the cross-section of the middle section of the rotating rod, and the support sleeve is fitted around the outer circumference of the rotating rod; along the extension direction of the axis of the rotating rod, one end of the support sleeve abuts against the front section of the rotating rod, and the other end of the support sleeve is provided with a second bearing between it and the middle component; wherein,

[0035] Along the extension direction of the axis of the rotating rod, both the second bearing and the support sleeve are located on the side of the central component facing the second housing.

[0036] Furthermore, the axial limiting structure includes a first nut and a second nut;

[0037] The second nut is threaded to the middle section of the rotating rod, and the first bearing is disposed between the second nut and the middle component;

[0038] The first nut is threadedly connected to the middle section of the rotating rod; wherein,

[0039] Along the extension direction of the axis of the rotating rod, one side of the first nut abuts against the second nut, and the other side of the first nut abuts against the elastic structure.

[0040] Furthermore, the linear drive device also includes a drive assembly, which is installed in the first housing. The power output end of the drive assembly is connected to the rear section of the rotating rod to drive the rotating rod to rotate.

[0041] According to another aspect of the present invention, a heliostat is provided, which applies the linear drive device in any of the above-described technical solutions.

[0042] By applying the technical solution of this utility model, an elastic structure is provided inside the housing of the linear drive device. This elastic structure can apply an axial preload to the axial limiting structure, ensuring tight contact between the threads of the axial limiting structure and the rotating rod. This increases the friction between the threads, reducing the possibility of rotation of the axial limiting structure relative to the rotating rod, and thus preventing axial loosening of the rotating rod. Even under complex working conditions such as external vibration and impact, the elastic structure, due to its own elasticity, can compensate for the minute displacement of the axial limiting structure caused by vibration, ensuring the continuity of the preload, improving the stability of the anti-loosening performance, avoiding displacement and friction after the axial limiting structure or rotating rod loosens, extending the service life of the components, and reducing maintenance costs. Simultaneously, it ensures the precise movement of the rotating rod, thereby improving the positioning accuracy of the linear drive device and enhancing its reliability and stability. Attached Figure Description

[0043] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0044] Figure 1 A partial cross-sectional view of the linear drive device provided by this utility model is shown;

[0045] Figure 2 It shows Figure 2 A magnified view of a section at point A in the middle;

[0046] Figure 3 A schematic diagram of the structure of the limiting piece provided by this utility model is shown;

[0047] Figure 4 A schematic diagram of the structure of the first nut provided by this utility model is shown;

[0048] Figure 5 A schematic diagram of the elastic structure provided by this utility model is shown.

[0049] The above figures include the following reference numerals:

[0050] 10. Shell; 101. Cavity; 11. First outer shell; 12. Middle component; 13. Second outer shell;

[0051] 20. Actuating component; 21. Rotating rod;

[0052] 30. Axial limiting structure; 31. First nut; 311. First through hole; 32. Second nut; 321. Second through hole; 33. First fastener; 34. Second fastener;

[0053] 40. Elastic structure;

[0054] 50. Limiting component; 51. Limiting piece; 52. Stopping element;

[0055] 61. First bearing; 62. Second bearing; 63. Third bearing; 64. Support sleeve;

[0056] 70. Drive component; 80. Output component; 81. Moving nut; 82. Inner tube; 83. Output component; 90. Connector. Detailed Implementation

[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0058] Example 1

[0059] like Figures 1 to 5As shown, this embodiment of the present invention provides a linear drive device, which includes: a housing 10, an actuating component 20, an axial limiting structure 30, an output component 80, and an elastic structure 40. The housing 10 has a cavity 101, the extension direction of which is the same as the extension direction of the axis of the housing 10. The actuating component 20 includes a rotating rod 21, which is rotatably disposed within the housing 10. The output component 80 is installed in the housing 10, and the rotating rod 21 is drivenly connected to the output component 80, enabling the rotating rod 21 to drive the output component 80 to move along the extension direction of its axis. The axial limiting structure 30 is installed on the rotating rod 21 and is configured to cooperate with the housing 10 to restrict the axial movement of the rotating rod 21. The elastic structure 40 is disposed in the housing 10 and acts on the axial limiting structure 30, being configured to apply a preload force along the axial direction of the rotating rod 21 to the axial limiting structure 30. The extension direction of the axis of the rotating rod 21 and the axial direction of the rotating rod 21 are both the same as the extension direction of the cavity 101. The rotating rod 21 can be a screw, lead screw, or a shaft structure with a threaded structure.

[0060] By applying the technical solution of this utility model, a cavity 101 is provided in the housing 10 of the linear drive device, and an elastic structure 40 is provided inside the cavity 101. The elastic structure 40 can apply a preload force along the axial direction of the rotating rod 21 to the axial limiting structure 30. This ensures that the threads of the axial limiting structure 30 and the rotating rod 21 maintain tight contact, increases the friction between the threads, and reduces the possibility of the axial limiting structure 30 rotating relative to the rotating rod 21, thereby preventing the rotating rod 21 from loosening in the axial direction. Even under complex working conditions such as external vibration and impact, the elastic structure 40 can compensate for the small displacement of the axial limiting structure 30 caused by vibration due to its own elasticity, ensuring the continuity of the preload force, improving the stability of the anti-loosening performance, avoiding displacement and friction after the axial limiting structure 30 or the rotating rod 21 loosens, extending the service life of the components, and reducing maintenance costs. At the same time, it ensures the precise movement of the rotating rod 21, thereby improving the positioning accuracy of the linear drive device and enhancing the reliability and stability of the linear drive device. Of course, in other embodiments, the axial limiting structure 30 and the rotating rod 21 may not be threaded, for example, they may be snap-fitted, and the specific connection method can be designed according to the actual use.

[0061] In this application, the specific structure of the elastic structure 40 is not limited. The elastic structure 40 is a disc spring or a spring. The above structure is simple, which can not only reduce the space occupied by the elastic structure 40, but also reduce the difficulty of installation and maintenance, thereby improving the operability and maintenance convenience of the push rod. Preferably, the elastic structure 40 is a disc spring.

[0062] In this embodiment, the elastic structure 40 is a disc spring. The disc spring has a conical structure, which can generate a large elastic force within a small deformation range. That is, a small amount of compression can store a large elastic potential energy, reducing the installation difficulty of the elastic structure 40.

[0063] In this embodiment, the axial limiting structure 30 includes a first nut 31, which is sleeved on the outer periphery of the rotating rod 21 and threadedly connected to it. The elastic structure 40 acts on the first nut 31 to apply a preload force along the axial direction of the rotating rod 21 to the first nut 31. Figure 2 and Figure 4 As shown, this makes the threaded connection between the first nut 31 and the rotating rod 21 tighter, thereby reducing the loosening of the first nut 31 on the rotating rod 21 due to external forces.

[0064] It should be noted that in other embodiments, the axial limiting structure 30 may have more than one nut; it may have several nuts. No specific limit is placed on the number of nuts; the number can be set according to the actual usage. For example, in other embodiments of this application, the axial limiting structure 30 may include multiple nuts, such as three or five.

[0065] In this embodiment, the axial limiting structure 30 further includes a second nut 32, which is sleeved on the outer periphery of the rotating rod 21 and threadedly connected to the rotating rod 21. The second nut 32 is located on the side of the first nut 31 away from the elastic structure 40. The elastic structure 40 is configured to apply a preload force along the axial direction of the rotating rod 21 to the first nut 31 and the second nut 32. Figure 2 As shown, the above design can prevent the nuts from loosening due to axial clearance between the second nut 32 and the first nut 31 during assembly. Furthermore, the mutual contact between the first nut 31 and the second nut 32 further increases the axial pressure between the two nuts, thereby increasing the friction between the axial limiting structure 30 and the threads of the rotating rod 21, reducing the possibility of the nuts loosening due to external forces. Simultaneously, the above design makes the structure more compact, reducing the space occupied by the axial limiting structure 30 and facilitating integration and installation. Of course, it should be noted that in other embodiments, the first nut 31 may not directly contact the second nut 32. For example, a washer may be present between the first nut 31 and the second nut 32. That is, in this technical solution, the axial limiting structure 30 is not limited to the second nut 32 and the first nut 31; as long as the elastic structure 40 applies a preload along the axial direction of the rotating rod 21 to the axial limiting structure 30, the specific structure of the axial limiting structure 30 can be designed according to the specific circumstances.

[0066] In this embodiment, the axial limiting structure 30 further includes at least one first fastener 33. At least one first through hole 311 is provided on the circumferential sidewall of the first nut 31. The first fastener 33 and the first through hole 311 are correspondingly arranged. The first through hole 311 penetrates the first nut 31 radially. The first fastener 33 passes through the first through hole 311 and abuts against the rotating rod 21 to fix the axial relative position of the first nut 31 and the rotating rod 21. And / or, the axial limiting structure 30 further includes at least one second fastener 34. At least one second through hole 321 is provided on the circumferential sidewall of the second nut 32. The second fastener 34 and the second through hole 321 are correspondingly arranged. The second through hole 321 penetrates the second nut 32 radially. The second fastener 34 passes through the second through hole 321 and abuts against the rotating rod 21 to fix the axial relative position of the second nut 32 and the rotating rod 21. Figure 2 and Figure 4 As shown, the radial contact between the first fastener 33 and the rotating rod 21 and the radial contact between the second fastener 34 and the rotating rod 21 restricts the axial movement of the first nut 31 and the second nut 32 on the rotating rod 21, and fixes the axial position of the first nut 31 and the second nut 32 on the rotating rod 21, thereby further enhancing the stability of the axial limiting structure 30.

[0067] Optionally, the first fastener 33 is threadedly connected to the first nut 31, and the second fastener 34 is threadedly connected to the second nut 32. The first fastener 33 and the second fastener 34 can be screws, bolts, or pins, etc. Preferably, both the first fastener 33 and the second fastener 34 are fastening screws.

[0068] In this design, the first nut 31 is machined into a planar structure in the circumferential direction at the location where the first through hole 311 is set. The first through hole 311 is machined on the planar structure. Compared with the curved structure, the above setting reduces the machining difficulty, can reduce machining errors, and improve the machining accuracy of the first through hole 311.

[0069] In some embodiments, the second nut 32 is also machined into a planar structure in the circumferential direction to facilitate the machining of the second through hole 321.

[0070] like Figure 4 As shown, in this embodiment, the first nut 31 has two first through holes 311 spaced apart circumferentially, and the two first through holes 311 are arranged opposite to each other. The second nut 32 has two second through holes 321 spaced apart circumferentially, and the two second through holes 321 are arranged opposite to each other. This can improve the uniformity of force on the nut and reduce loosening of the nut due to uneven force.

[0071] In other embodiments, a first through hole 311 may be provided on the first nut 31, and / or a second through hole 321 may be provided on the second nut 32.

[0072] Furthermore, the linear drive device also includes a limiting component 50, which is mounted on the outer periphery of the rotating rod 21 and rotates synchronously with the rotating rod 21. The limiting component 50 is configured to restrict the movement of the elastic structure 40 away from the axial limiting structure 30. Thus, the limiting component 50 can restrict the axial displacement of the elastic structure 40, thereby ensuring that the elastic structure 40 can continuously apply a preload to the axial limiting structure 30, guaranteeing stable contact between the elastic structure 40 and the axial limiting structure 30.

[0073] Specifically, such as Figure 2 and Figure 3 As shown, the limiting component 50 abuts against the end of the elastic structure 40 away from the axial limiting structure 30. The limiting component 50 includes a limiting piece 51, a stop member 52, and a limiting groove. The limiting piece 51 is sleeved on the outer periphery of the rotating rod 21 and is located at the end of the elastic structure 40 away from the axial limiting structure 30, abutting against the elastic structure 40. The stop member 52 is fixed to the outer periphery of the rotating rod 21 and is located at the end of the limiting piece 51 away from the axial limiting structure 30. The stop member 52 is used to fix the relative position of the limiting piece 51 to the axial direction of the rotating rod 21. The limiting groove is annularly arranged on the rotating rod 21, corresponding to the stop member 52. At least a portion of the stop member 52 is located within the limiting groove and engages with the limiting groove along the axial direction of the rotating rod 21. The elastic structure 40 is supported by the contact between the limiting piece 51 and the elastic structure 40, and the limiting piece 51 is fixed by the stop piece 52. The limiting piece 51 and the stop piece 52 restrict the axial displacement of the elastic structure 40, ensuring that it continuously applies a preload to the axial limiting structure 30. At the same time, by setting the limiting groove, the elastic structure 40 can abut the stop piece 52 at the axial end of the limiting groove to fix the position of the stop piece 52 relative to the rotating rod 21, thereby enhancing the stability of the stop piece 52 in fixing the limiting piece 51.

[0074] Preferably, the limiting piece 51 is made of a high-strength, wear-resistant material to improve the pressure resistance and deformation resistance of the limiting piece 51.

[0075] In this embodiment, the limiting piece 51 is a gasket, and the stop piece 52 is an elastic retaining ring.

[0076] In some alternative embodiments, the limiting piece 51 is an elastic piece or a nut, and the stop piece 52 is a limiting block. The stop piece 52 can be welded to the rotating rod 21, through a key structure, or through an interference fit.

[0077] In this embodiment, as Figure 1As shown, the housing 10 includes a first outer shell 11, a central member 12, and a second outer shell 13. A rotating rod 21 passes through the central member 12 and is rotatably connected to it. Along the extension direction of the axis of the rotating rod 21, the first outer shell 11 is mounted on one side of the central member 12, and the first outer shell 11 is connected to the central member 12 by a third fastener. Along the extension direction of the axis of the rotating rod 21, the second outer shell 13 is mounted on the other side of the central member 12, and the second outer shell 13 is connected to the central member 12 by a fourth fastener. Through this arrangement, the housing 10 is divided into three detachable sections, making the linear drive device easy to disassemble and assemble, facilitating installation and maintenance.

[0078] The central component 12 is detachably connected to the first outer shell 11 and the second outer shell 13 via a third fastener and a fourth fastener, respectively. The third fastener is a bolt, screw, rivet, or other connecting component; the fourth fastener is a bolt, screw, rivet, or other connecting component. The third and fourth fasteners can be selected according to the actual situation.

[0079] In this embodiment, the rotating rod 21 is divided into a front section, a middle section, and a rear section along the axial direction. The front section of the rotating rod 21 is driven and connected to the output component 80, which is installed in the second housing 13. The middle section of the rotating rod 21 passes through the middle component 12 and is rotatably connected to it. The axial limiting structure 30 and the elastic structure 40 are both sleeved on the outer periphery of the middle section. Along the extension direction of the axis of the rotating rod 21, the axial limiting structure 30 and the elastic structure 40 are both located on the side of the middle component 12 facing the first housing 11. Through the above design, the component positions can be designed according to function during structural design, improving the overall structure of the linear drive device and the rationality of the internal component arrangement. Furthermore, when disassembling and maintaining different components, the corresponding parts on the housing 10 can be directly replaced without having to disassemble them all sequentially.

[0080] In this embodiment, the actuating component 20 includes a first bearing 61, a second bearing 62, a third bearing 63, and a support sleeve 64; the third bearing 63 is sleeved on the middle section of the rotating rod 21 and is disposed between the rotating rod 21 and the middle component 12; the first bearing 61 is sleeved on the middle section of the rotating rod 21 and is disposed between the rotating rod 21 and the axial limiting structure 30; the radius of the cross-section of the front section of the rotating rod 21 is larger than the radius of the cross-section of the middle section of the rotating rod 21, and the support sleeve 64 is sleeved on the outer periphery of the rotating rod 21; along the extension direction of the axis of the rotating rod 21, one end of the support sleeve 64 abuts against the front section of the rotating rod 21, and the other end of the support sleeve 64 is provided with the second bearing 62 between it and the middle component 12.

[0081] Furthermore, along the extension direction of the axis of the rotating rod 21, the second bearing 62 and the support sleeve 64 are both located on the side of the middle component 12 facing the second housing 13. The axial limiting structure 30 includes a first nut 31 and a second nut 32. The second nut 32 is threadedly connected to the middle section of the rotating rod 21, and the first bearing 61 is disposed between the second nut 32 and the middle component 12. The first nut 31 is threadedly connected to the middle section of the rotating rod 21. Along the extension direction of the axis of the rotating rod 21, one side of the first nut 31 abuts against the second nut 32, and the other side of the first nut 31 abuts against the elastic structure 40.

[0082] Specifically, such as Figure 2 As shown, the first bearing 61 is sleeved on the outer circumference of the rotating rod 21. The first bearing 61 has a seat ring and a shaft ring. The shaft ring can rotate relative to the seat ring. The seat ring is connected to the central component 12. The rotating rod 21 rotates synchronously with the shaft ring to ensure smooth rotation between the rotating rod 21 and the housing 10. The axial limiting structure 30 also includes a second nut 32. The second nut 32 has a connecting section and an abutting section arranged sequentially. The abutting section abuts against the end face of the first bearing 61 on the side closer to the first bearing 61, and abuts against the first nut 31 on the side farther from the first bearing 61. The connecting section is located inside the shaft ring and rotates synchronously with the shaft ring. The setting of the connecting section increases the contact area between the second nut 32, the first bearing 61, and the rotating rod 21, improving the stability of the transmission. Among them, the first bearing 61 is a thrust bearing.

[0083] The second bearing 62 has its ring sleeved around the outer circumference of the rotating rod 21 and located on the side of the central component 12 away from the elastic structure 40. The seat ring of the second bearing 62 is connected to the central component 12. The third bearing 63 has an inner ring and an outer ring. The outer ring is sleeved around the outer circumference of the inner ring, and the inner ring can rotate relative to the outer ring. The outer ring is connected to the central component 12, and the inner ring cooperates with the rotating rod 21. The rotating rod 21 rotates synchronously with the inner ring. The third bearing 63 is used to provide radial rotational support for the rotating rod 21 and reduce the rotational friction of the rotating rod 21. A support sleeve 64 is fitted around the outer circumference of the rotating rod 21 and rotates synchronously with it. The support sleeve 64 is located on the side of the second bearing 62 away from the first bearing 61. One end of the support sleeve 64 abuts against the end face of the second bearing 62, and the other end of the support sleeve 64 abuts against the rotating rod 21 axially. The rotating rod 21 has a circumferential protrusion corresponding to the support sleeve 64 (i.e., the radius of the cross-section of the front section of the rotating rod 21 is larger than the radius of the cross-section of the middle section of the rotating rod 21). The circumferential protrusion abuts against the end face of the support sleeve 64 away from the second bearing 62 to limit the relative displacement between the support sleeve 64 and the rotating rod 21 in the axial direction. The second bearing 62 is a thrust bearing, and the third bearing 63 is a ball bearing. The thrust bearing can withstand axial loads, further reducing the axial movement of the rotating rod 21.

[0084] It should be noted that, as mentioned above, in this embodiment, the first bearing 61 is a thrust bearing, the second bearing 62 is a thrust bearing, and the third bearing 63 is a ball bearing; however, in other embodiments, the first bearing can be one of the following: ball bearing, tapered roller bearing, deep groove ball bearing, thrust bearing, and cylindrical bearing; the second bearing can be one of the following: ball bearing, tapered roller bearing, deep groove ball bearing, thrust bearing, and cylindrical bearing; and the third bearing can be one of the following: ball bearing, tapered roller bearing, deep groove ball bearing, thrust bearing, and cylindrical bearing. The specific bearing selected can be designed according to the actual application.

[0085] like Figure 1 and Figure 2 As shown, specifically, the output assembly 80 includes a movable nut 81, an inner tube 82, and an output component 83. The movable nut 81 is threadedly connected to the rotating rod 21. When the rotating rod 21 rotates, the movable nut 81 can move relative to the rotating rod 21 along the extension direction of the cavity 101. The movable nut 81 is connected to the output component 83 through the inner tube 82 to drive the output component 83 to move along the extension direction of the cavity 101. The output component 83 can be connected to external components that require position translation or angle adjustment. A connector 90 is connected to the end of the second housing 13. The connector 90 is used to connect external equipment. Specifically, the connector 90 is a double-ear flange.

[0086] In this embodiment, the linear drive device further includes a drive assembly 70, which is installed in the first housing 11. The power output end of the drive assembly 70 is connected to the rear section of the rotating rod 21 to drive the rotating rod 21 to rotate.

[0087] Specifically, the drive assembly 70 includes a motor and a worm gear assembly. The motor drives the worm to rotate, the worm drives the worm wheel to rotate, and the drive section rotates synchronously with the worm wheel.

[0088] When the linear drive device is operating, the rotating rod 21 may tend to loosen under various external forces. At this time, the elastic potential energy stored in the elastic structure 40 due to the axial compression of the limiting component 50 is released, continuously applying axial pressure to the axial limiting structure 30, maintaining a large frictional force between the axial limiting structure 30 and the thread of the rotating rod 21, resisting the loosening tendency. At the same time, the first fastener 33 and the second fastener 34, through the close contact between their ends and the surface of the rotating rod 21, further restrict the rotation of the axial limiting structure 30 in the radial direction, achieving a reliable anti-loosening effect under the dual action. Even under harsh working conditions such as vibration and impact, the elastic structure 40 can continuously compensate for the small displacement of the axial limiting structure 30 caused by vibration, always maintaining sufficient axial pressure to ensure the stability of the anti-loosening performance.

[0089] The linear drive device provided by this utility model achieves the following technical effects:

[0090] 1. Significantly improved anti-loosening performance: The dual action of the elastic structure 40 and the first fastener 33 and the second fastener 34 can provide a reliable anti-loosening effect for the axial limiting structure 30 under various complex working conditions. Compared with traditional anti-loosening methods, it improves the stability and reliability of the rotating rod 21 connection.

[0091] 2. Compact structure and small space occupation: The linear drive device has a compact overall structure design and reasonable layout of each component, which optimizes the structural design of the linear drive device;

[0092] 3. Easy installation and maintenance: Compared with round nuts and nut retaining washers, the elastic structure 40 and limiting component 50 of this application are easy to install without special tools or complicated operating procedures; during maintenance, each component is easy to disassemble and replace, reducing the maintenance cost of the equipment.

[0093] Example 2

[0094] According to another embodiment of the present invention, a heliostat is provided, which utilizes the linear drive device provided in the above embodiments. The heliostat includes a reflector and a support, and the heliostat is mounted above the support for reflecting sunlight. The linear drive device from any of the technical solutions in Embodiment 1 can be used, and the linear drive device is installed in the heliostat to adjust the pitch or azimuth angle of the reflector.

[0095] In other embodiments of this invention, the linear drive device can also be applied to other devices that require angle or position adjustment.

[0096] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0097] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0098] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0099] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0100] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0101] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A linear drive device, characterized in that, The linear drive device includes: Shell (10); The actuating component (20) includes a rotating rod (21) which is rotatably disposed within the housing (10); Output component (80), the output component (80) is installed in the housing (10), the rotating rod (21) is driven to the output component (80), and the rotating rod (21) can drive the output component (80) to move along the extension direction of the axis of the rotating rod (21); An axial limiting structure (30) is installed on the rotating rod (21), and the axial limiting structure (30) is configured to cooperate with the housing (10) to limit the axial movement of the rotating rod (21); An elastic structure (40) is disposed in the housing (10), the elastic structure (40) acts on the axial limiting structure (30), and the elastic structure (40) is configured to apply a preload force along the axial direction of the rotating rod (21) to the axial limiting structure (30).

2. The linear drive device according to claim 1, characterized in that, The axial limiting structure (30) includes a first nut (31), which is sleeved on the outer periphery of the rotating rod (21) and threadedly connected to the rotating rod (21). The elastic structure (40) acts on the first nut (31) to apply a preload force along the axial direction of the rotating rod (21) to the first nut (31).

3. The linear drive device according to claim 2, characterized in that, The axial limiting structure (30) further includes a second nut (32), which is sleeved on the outer periphery of the rotating rod (21) and threadedly connected to the rotating rod (21). The second nut (32) is located on the side of the first nut (31) away from the elastic structure (40); wherein, The elastic structure (40) is configured to apply a preload force along the axial direction of the rotating rod (21) to the first nut (31) and the second nut (32).

4. The linear drive device according to claim 3, characterized in that, The axial limiting structure (30) further includes at least one first fastener (33). At least one first through hole (311) is provided on the circumferential sidewall of the first nut (31). The first fastener (33) and the first through hole (311) are provided in a one-to-one correspondence. The first through hole (311) passes through the first nut (31) radially. The first fastener (33) passes through the first through hole (311) and abuts against the rotating rod (21) to fix the axial relative position of the first nut (31) and the rotating rod (21); and / or, The axial limiting structure (30) further includes at least one second fastener (34). At least one second through hole (321) is provided on the circumferential side wall of the second nut (32). The second fastener (34) is provided in a one-to-one correspondence with the second through hole (321). The second through hole (321) passes through the second nut (32) radially. The second fastener (34) passes through the second through hole (321) and abuts against the rotating rod (21) to fix the relative axial position of the second nut (32) and the rotating rod (21).

5. The linear drive device according to claim 1, characterized in that, The linear drive device further includes a limiting component (50), which is mounted on the outer periphery of the rotating rod (21) and rotates synchronously with the rotating rod (21); wherein, The limiting component (50) is configured to restrict the elastic structure (40) from moving away from the axial limiting structure (30).

6. The linear drive device according to claim 5, characterized in that, The limiting component (50) abuts against one end of the elastic structure (40) away from the axial limiting structure (30), and the limiting component (50) includes: A limiting piece (51) is sleeved on the outer periphery of the rotating rod (21). The limiting piece (51) is located at one end of the elastic structure (40) away from the axial limiting structure (30) and abuts against the elastic structure (40). A stop member (52) is sleeved on the outer periphery of the rotating rod (21). The stop member (52) is located at one end of the limiting piece (51) away from the axial limiting structure (30). The stop member (52) is used to fix the relative position of the limiting piece (51) to the rotating rod (21) in the axial direction. A limiting groove is arranged in a ring on the rotating rod (21). The limiting groove is correspondingly arranged with the stop member (52). At least part of the stop member (52) is located in the limiting groove and is engaged with the limiting groove along the axial direction of the rotating rod (21).

7. The linear drive device according to claim 1, characterized in that, The elastic structure (40) is a disc spring or a spring.

8. The linear drive device according to any one of claims 1 to 7, characterized in that, The housing (10) includes a first outer shell (11), a middle component (12), and a second outer shell (13). The rotating rod (21) passes through the middle component (12) and is rotatably connected to the middle component (12). Along the extension direction of the axis of the rotating rod (21), the first housing (11) is mounted on one side of the middle member (12), and the first housing (11) and the middle member (12) are connected by a third fastener; Along the extension direction of the axis of the rotating rod (21), the second housing (13) is mounted on the other side of the middle member (12), and the second housing (13) is connected to the middle member (12) by a fourth fastener.

9. The linear drive device according to claim 8, characterized in that, The rotating rod (21) is divided into a front section, a middle section and a rear section along the axial direction; The front end of the rotating rod (21) is driven to connect with the output component (80), which is installed in the second housing (13); The middle section of the rotating rod (21) passes through the middle component (12) and is rotatably connected to the middle component (12). The axial limiting structure (30) and the elastic structure (40) are both sleeved on the outer periphery of the middle section. Along the extension direction of the axis of the rotating rod (21), the axial limiting structure (30) and the elastic structure (40) are both located on the side of the central member (12) facing the first outer shell (11).

10. The linear drive device according to claim 9, characterized in that, The actuating component (20) includes a first bearing (61), a second bearing (62), a third bearing (63), and a support sleeve (64); The third bearing (63) is sleeved on the middle section of the rotating rod (21), and the third bearing (63) is disposed between the rotating rod (21) and the middle component (12); The first bearing (61) is sleeved on the middle section of the rotating rod (21), and the first bearing (61) is disposed between the rotating rod (21) and the axial limiting structure (30); The radius of the cross-section of the front section of the rotating rod (21) is larger than the radius of the cross-section of the middle section of the rotating rod (21), and the support sleeve (64) is sleeved on the outer periphery of the rotating rod (21); along the extension direction of the axis of the rotating rod (21), one end of the support sleeve (64) abuts against the front section of the rotating rod (21), and the other end of the support sleeve (64) is provided with a second bearing (62) between it and the middle component (12); wherein, Along the extension direction of the axis of the rotating rod (21), the second bearing (62) and the support sleeve (64) are both located on the side of the central member (12) facing the second housing (13).

11. The linear drive device according to claim 10, characterized in that, The axial limiting structure (30) includes a first nut (31) and a second nut (32); The second nut (32) is threaded to the middle section of the rotating rod (21), and the first bearing (61) is disposed between the second nut (32) and the middle component (12); The first nut (31) is threadedly connected to the middle section of the rotating rod (21); wherein, Along the extension direction of the axis of the rotating rod (21), one side of the first nut (31) abuts against the second nut (32), and the other side of the first nut (31) abuts against the elastic structure (40).

12. The linear drive device according to claim 9, characterized in that, The linear drive device further includes a drive assembly (70), which is installed in the first housing (11). The power output end of the drive assembly (70) is connected to the rear section of the rotating rod (21) to drive the rotating rod (21) to rotate.

13. A heliostat, characterized in that, The heliostat uses the linear drive device described in any one of claims 1 to 12.

Images