Pitch shaft dynamic sealing structure and photoelectric rotary table

Abstract

The utility model relates to the technical field of photoelectric rotary tables, and discloses a pitch shaft dynamic sealing structure and a photoelectric rotary table, and the pitch shaft dynamic sealing structure comprises a bearing seat assembly which is provided with a first through hole; the bearing is arranged in the first through hole; the pitch shaft is arranged on the bearing in a penetrating mode, the pitch shaft is provided with a switching end partially extending out of the bearing seat assembly, and the switching end is configured to be connected with a suspension frame of the photoelectric rotary table; a plurality of annular protruding parts are formed on the circumferential side of the switching end and arranged in the axial direction of the pitch shaft at intervals, an annular groove is formed between every two adjacent annular protruding parts at intervals, the bearing seat assembly is provided with a cover structure surrounding the annular protruding parts, and the projection of the cover structure in the radial direction of the pitch shaft covers the annular grooves. The cover structure, the annular protruding part and the annular groove are arranged at intervals to form a dynamic sealing gap, the dynamic sealing performance of the pitch shaft can be improved on the premise that the motion resistance generated when the pitch shaft and the bearing seat assembly move relatively is not increased, the structure is simple, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to photoelectric turntable technical field especially, a kind of pitch axis dynamic sealing structure and photoelectric turntable. BACKGROUND

[0002] With the rapid development of photoelectric imaging technology, photoelectric imaging search tracking system is widely used in military, civil field, and application environment is also complex and changeable, often need to be equipped with "dustproof, rainproof, salt fog proof" function.

[0003] The entire photoelectric turntable needs to have rainproof function, especially in the rotating part of the relative rotation of the pitch axis relative bearing seat assembly, has higher rainproof requirement. The current pitch axis dynamic sealing technology of photoelectric turntable mainly includes rubber seal, mechanical seal and liquid seal. First, the rubber seal structure adopts several ways such as sealing ring and gasket, but sealing ring and gasket sealing assembly need to be matched with processing, and the assembly difficulty is high, and there is always friction resistance, sealing and friction are a set of contradictory parameters, sealing good friction is large, friction is small, it is not easy to seal, and large rotating friction resistance is often caused by the pitch axis dynamic sealing of rainproof sealing ring, which has great influence on the low-speed performance of photoelectric turntable. Secondly, liquid seal technology, although the sealing performance of liquid seal technology is stable, but the structure is complex, and the manufacturing and maintenance cost is high. Thirdly, mechanical seal technology, its shortcomings are that maintenance cost is high, installation is complex, and sealing parts and lubricating oil need to be replaced regularly.

[0004] Therefore, it is urgent to provide a pitch axis dynamic sealing structure and photoelectric turntable, so as to improve the dynamic sealing performance of the pitch axis without increasing the movement resistance of the relative movement between the pitch axis and the bearing seat assembly, and the structure is simple and the cost is low. UTILITY MODEL CONTENTS

[0005] Based on the above, the purpose of the utility model is to provide a pitch axis dynamic sealing structure and photoelectric turntable, so as to improve the dynamic sealing performance of the pitch axis without increasing the movement resistance of the relative movement between the pitch axis and the bearing seat assembly, and the structure is simple and the cost is low.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The first aspect of the application provides a pitch axis dynamic sealing structure, which comprises:

[0008] Bearing seat assembly, which is provided with a first through hole;

[0009] Bearing, which is arranged in the first through hole;

[0010] Pitch axis, which is arranged in the bearing, and the pitch axis has a rotating end that extends out of the bearing seat assembly, and the rotating end is configured to be connected with a suspended frame of a photoelectric turntable.

[0011] The adapter end is provided with a plurality of annular protrusions on the circumferential side, the annular protrusions are arranged at intervals in the axial direction of the pitch shaft, an annular groove is formed at intervals between two adjacent annular protrusions, the bearing seat assembly is provided with a cover structure surrounding each annular protrusion, and the projection of the cover structure in the radial direction of the pitch shaft covers the annular groove, and the cover structure is spaced from the annular protrusion and the annular groove to form a dynamic sealing gap.

[0012] In some embodiments, the annular groove extends in the circumferential direction of the pitch shaft, the cover structure includes a strip-shaped protrusion extending into the annular groove, the strip-shaped protrusion is spaced from the groove wall of the annular groove, and the strip-shaped protrusion extends in the circumferential direction of the pitch shaft.

[0013] In some embodiments, the cover structure is provided with a drain hole, the drain hole is in communication with the annular groove, and the drain hole is located below the pitch shaft with respect to the up-down direction of the pitch shaft.

[0014] In some embodiments, the adapter end also has an adapter end face adjacent to the circumferential side of the adapter end, and the pitch shaft dynamic sealing structure further comprises:

[0015] A first sealing ring is fixed to the adapter end face, and the first sealing ring is configured to be clamped between the suspension frame and the adapter end face.

[0016] In some embodiments, the adapter end face is provided with a first assembly groove, and the first sealing ring is arranged in the first assembly groove; and / or,

[0017] The bearing has two, and the pitch shaft dynamic sealing structure further comprises a bearing pad clamped between two adjacent bearings; and / or,

[0018] A plurality of connecting holes are formed on the adapter end face, and the plurality of connecting holes are configured to be fastened and connected with the suspension frame by fasteners.

[0019] In some embodiments, the bearing seat assembly comprises:

[0020] A carrier body, and the first through hole is formed in the carrier body;

[0021] A plurality of cover units are respectively detachably fixedly connected with the carrier body, and each cover unit is arranged around the pitch shaft;

[0022] Each cover unit is sealingly matched with each other to form the cover structure; or each cover unit and the carrier body are sealingly matched with each other to form the cover structure.

[0023] In some embodiments, the pitch shaft dynamic sealing structure further comprises:

[0024] a first sealing gasket, which is arranged between two adjacent cover units; and / or,

[0025] a second sealing ring, which is arranged between the cover unit and the carrier body.

[0026] In some embodiments, the cover unit has a circular arc structure extending along the axial direction of the pitch shaft, and the circumferential angle of each cover unit is less than 180 degrees.

[0027] In some embodiments, the cover unit has two cover units, each of which has a semi-circular ring structure.

[0028] The second aspect of the present application provides an optoelectronic turntable, which comprises:

[0029] a suspension frame and a carrier frame; and

[0030] a pitch shaft assembly, wherein the carrier frame is rotatably connected to the suspension frame through the pitch shaft assembly, and the carrier frame is capable of performing pitch rotation relative to the suspension frame.

[0031] In some embodiments, the pitch shaft dynamic sealing structure further comprises:

[0032] The pitch shaft dynamic sealing structure of the present application has the following advantages:

[0033] The pitch shaft dynamic sealing structure of the present application has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the present application and the drawings.

[0035] Figure 1 A perspective view of a pitch shaft dynamic sealing structure is provided for some embodiments of the present application.

[0036] Figure 2 A split schematic view of a pitch shaft dynamic sealing structure is provided for some embodiments of the present application. Figure 1

[0037] Figure 3 A split schematic view of a pitch shaft dynamic sealing structure is provided for some embodiments of the present application. Figure 2

[0038] Figure 4 A schematic view of an optoelectronic turntable is provided for some embodiments of the present application.

[0039] Figure 5 A chassis and a pitch shaft assembly of an optoelectronic turntable are provided for some embodiments of the present application.

[0040] In the drawings:

[0041] 1, a suspension frame; 2, a chassis; 3, a pitch shaft assembly;

[0042] 100, a bearing seat assembly; 110, a carrier body; 111, a first through hole; 120, a cover structure; 121, a cover monomer; 1211, a strip-shaped protruding part; 1212, a drainage hole; 122, a first sealing gasket;

[0043] 200, a bearing;

[0044] 300, a pitch shaft; 310, an annular protruding part; 320, an annular groove; 330, a first assembly groove; 340, a connecting hole;

[0045] 400, a first sealing ring;

[0046] 500, a bearing pad;

[0047] 600, a second sealing ring;

[0048] 700, a positioning nut. DETAILED DESCRIPTION

[0049] ​​In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model embodiment will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0050] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] In the description of the embodiment, the terms "up", "down", "left", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0053] Currently, the technology of the elevation shaft dynamic seal of the photoelectric turntable mainly includes rubber seal, mechanical seal and liquid seal. First, the rubber seal structure adopts several ways such as seal ring and gasket, but the seal ring and gasket sealing assembly need to be matched with processing, and the assembly is difficult, and there is always friction resistance. The sealing and friction are a group of contradictory parameters. If the sealing is good, the friction is large, and if the friction is small, it is not easy to seal. The rainproof dynamic seal ring often causes large rotary friction resistance, which has a great influence on the low-speed performance of the photoelectric turntable. Second, the liquid seal technology has stable sealing performance, but the structure is complex and the manufacturing and maintenance cost is high. Third, the mechanical seal technology has the disadvantages of high maintenance cost and complex installation, which needs to replace the sealing parts and lubricating oil regularly.

[0054] In view of the above problems, some embodiments of the present application provide an improved elevation shaft dynamic seal structure, which can improve the dynamic sealing performance of the elevation shaft without increasing the movement resistance of the relative movement between the elevation shaft and the bearing seat assembly. The structure is simple and has low cost. The following will introduce in detail an elevation shaft dynamic seal structure provided by some embodiments of the present application.

[0055] Reference Figures 1-3 The elevation shaft dynamic seal structure includes a bearing seat assembly 100, a bearing 200 and an elevation shaft 300. The bearing seat assembly 100 is provided with a first through hole 111; the bearing 200 is arranged in the first through hole 111; the elevation shaft 300 is arranged in the bearing 200, and the elevation shaft 300 has a transition end which extends out of the bearing seat assembly 100 and is configured to be connected with a suspension frame 1 of the photoelectric turntable; wherein a plurality of annular protruding portions 310 are formed on the circumferential side of the transition end, the plurality of annular protruding portions 310 are arranged at intervals in the axial direction of the elevation shaft 300, and an annular groove 320 is formed at intervals between adjacent two annular protruding portions 310. The bearing seat assembly 100 has a cover structure 120 arranged around each annular protruding portion 310, and the projection of the cover structure 120 in the radial direction of the elevation shaft 300 covers the annular groove 320. The cover structure 120 is spaced apart from the annular protruding portion 310 and the annular groove 320 to form a dynamic sealing gap. In addition, the structure diagram of the photoelectric turntable can refer to Figures 4-5 .

[0056] The advantages of the elevation shaft dynamic seal structure of the embodiments of the present application are that, on the one hand, the path of the rainwater flowing along the circumferential side of the transition end to the first through hole 111 is lengthened, and the difficulty of flowing is increased; on the other hand, the cover structure 120 is spaced apart from the annular protruding portion 310 and the annular groove 320, so that there is no dynamic friction, i.e. no dynamic friction resistance, and thus the movement resistance of the relative movement between the elevation shaft 300 and the bearing seat assembly 100 is not increased, thereby improving the dynamic sealing performance of the elevation shaft 300, and the structure also has the advantages of simple structure and low cost.

[0057] In some embodiments, referring to Figures 1-3 , the cover structure 120 comprises a strip-shaped protrusion 1211 extending into the annular groove 320, the strip-shaped protrusion 1211 is spaced from the groove wall of the annular groove 320, and the strip-shaped protrusion 1211 extends along the circumference of the pitch axis 300. Further, when the leaked rainwater flows in the dynamic sealing gap, the strip-shaped protrusion 1211 rotates relative to the annular protrusion 310, at this time, the friction caused by the liquid viscosity slows down the flow rate, and the friction along the annular groove 320 and the local friction resistance constitute the friction effect, thereby reducing the infiltration of rainwater.

[0058] Referring to Figures 1-3 , in some embodiments, the cover structure 120 is provided with a drain hole 1212, the drain hole 1212 is in communication with the annular groove 320, and the drain hole 1212 is located below the pitch axis 300 relative to the up-down direction of the pitch axis 300. In order to further improve the sealing performance of the pitch axis 300, the cover structure 120 is provided with a drain hole 1212, and the drain hole 1212 is located below the pitch axis 300, so that when there is rainwater in the annular groove 320, the rainwater will flow out along the drain hole 1212, thereby preventing rainwater from entering the inside of the first through hole 111 of the bearing seat assembly 100.

[0059] In some embodiments, referring to Figures 1-3 , the adapter end also has an adapter end face adjacent to the circumferential side of the adapter end, and the pitch axis dynamic sealing structure further comprises a first sealing ring 400, the first sealing ring 400 is fixed to the adapter end face, and the first sealing ring 400 is configured to be clamped between the suspension frame 1 and the adapter end face, thereby playing a role of static sealing connection through the first sealing ring 400, so that the adapter end face of the adapter end and the connecting part of the suspension frame 1 are statically sealed through the first sealing ring 400.

[0060] Referring to Figures 1-3 , in some embodiments, the adapter end face is provided with a first assembly groove 330, and the first sealing ring 400 is arranged in the first assembly groove 330. The first assembly groove 330 has a simple structure, which facilitates the assembly and fixation of the position of the first sealing ring 400.

[0061] In some embodiments, referring to Figures 1-3 , the bearing 200 has two, and the pitch axis dynamic sealing structure further comprises a bearing pad 500, the bearing pad 500 is clamped between the two adjacent bearings 200, thereby improving the support and load capacity of the pitch axis 300.

[0062] Referring to Figures 1-3In order to prevent the bearings 200 from drifting in the axial direction of the pitch shaft 300, a limiting step is formed on the pitch shaft 300 and abuts against one side of the whole of the two bearings 200 in the axial direction of the pitch shaft 300; in addition, the pitch shaft dynamic sealing structure further comprises a positioning nut 700, which is threadedly connected with the pitch shaft 300 and abuts against the other side of the whole of the two bearings 200 in the axial direction of the pitch shaft 300, thereby fixing the positions of the two bearings 200.

[0063] In some embodiments, reference is made to Figures 1-3 A plurality of connecting holes 340 are formed on the adapter end face, and the plurality of connecting holes 340 are configured to be fastened and connected with the suspension frame 1 by fasteners, which is simple in structure and low in processing cost.

[0064] The bearing seat assembly 100 will be introduced below. Reference is made to Figures 1-3 In some embodiments, the bearing seat assembly 100 comprises a carrier body 110 and a plurality of cover units 121. A first through hole 111 is formed on the carrier body 110; the plurality of cover units 121 are respectively detachably fixedly connected with the carrier body 110, and each cover unit 121 is arranged around the pitch shaft 300; illustratively, the detachable fixed connection can be a bolt fastening connection, a threaded connection, etc. Among them, each cover unit 121 is sealingly matched with each other to form a cover structure 120; or in some embodiments, each cover unit 121 and the carrier body 110 are sealingly matched with each other to form the cover structure 120.

[0065] In some embodiments, reference is made to Figures 1-3 The pitch shaft dynamic sealing structure further comprises a first sealing gasket 122, which is clamped between two adjacent cover units 121, thereby achieving sealing cooperation between the two adjacent cover units 121 and reducing the gap between them to prevent rain leakage.

[0066] In some embodiments, reference is made to Figures 1-3 The pitch shaft dynamic sealing structure further comprises a second sealing ring 600, which is clamped between the cover unit 121 and the carrier body 110, thereby achieving sealing cooperation between the cover unit 121 and the carrier body 110 and reducing the gap between them to prevent rain leakage.

[0067] In some embodiments, reference is made to Figures 1-3 The cover unit 121 is in the form of a circular arc structure extending in the axial direction of the pitch shaft 300, and the circumferential angle of each cover unit 121 is not more than 180°, which facilitates the installation and disassembly of the cover unit 121.

[0068] Further, in some embodiments, reference is made to Figures 1-3, the cover monomer 121 is in a circular arc structure extending along the axial direction of the pitch axis 300, and the strip-shaped protruding part 1211 is formed on the inner wall of the cover monomer 121, and the two cover monomers 121 are combined to form an approximately closed circular ring around the first sealing gasket 122, and the annular protruding part 310 is surrounded, and the strip-shaped protruding part 1211 extends into the corresponding annular groove 320. The two strip-shaped protruding parts 1211 in the same annular groove 320 can cooperate with the sealing of the first sealing gasket 122 to form a closed annular structure to achieve the flow resistance of the infiltrated rainwater. Further, the drain hole 1212 is arranged on one of the cover monomers 121.

[0069] Further, referring to Figures 1-3 , the drain hole 1212 can be in communication with each annular groove 320, thereby achieving rapid drainage of the rainwater in each annular groove 320 and improving the overall waterproof dynamic sealing effect of the pitch axis dynamic sealing structure.

[0070] Referring to Figure 1 , in some embodiments, the cover monomer 121 has two, and each cover monomer 121 is in a semi-circular ring structure, which can facilitate the installation and disassembly of the cover monomer 121, and can also reduce the number of parts of the cover monomer 121 and simplify the assembly process.

[0071] In addition, referring to Figure 2 , Figures 4-5 and ​ , some embodiments of the present application also provide an optoelectronic turntable, which comprises a suspended frame 1, a chassis 2 and a pitch axis assembly 3, the chassis 2 is rotatably connected to the suspended frame 1 through the pitch axis assembly 3, and the chassis 2 can be pitch-rotated relative to the suspended frame 1; wherein the pitch axis assembly 3 comprises the pitch axis dynamic sealing structure provided by any of the above embodiments, and details are not repeated.

[0072] Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A pitch axis dynamic seal structure, characterized by, The utility model relates to a bearing seat assembly (100) is provided with first through -hole (111), bearing (200) is provided with in first through -hole (111), pitch shaft (300) is passed and is equipped with in bearing (200), pitch shaft (300) has the adapter end of part of the extension bearing seat assembly (100), and the adapter end is configured as with the suspension frame (1) of photoelectric turntable is connected, wherein the circumference of adapter end forms a plurality of annular convex parts (310), a plurality of annular convex parts (310) are arranged in the axial direction of pitch shaft (300) and are spaced, and annular groove (320) is formed between adjacent two annular convex parts (310), bearing seat assembly (100) has the cover structure (120) of being arranged around each annular convex part (310), and the projection of cover structure (120) in the radial direction of pitch shaft (300) covers annular groove (320), and cover structure (120) and annular convex part (310) and annular groove (320) are spaced to form dynamic sealing gap. Annular groove (320) extends along the circumference of pitch shaft (300), and cover structure (120) includes strip-shaped convex part (1211) extending into annular groove (320), strip-shaped convex part (1211) is spaced from the groove wall of annular groove (320), and strip-shaped convex part (1211) extends along the circumference of pitch shaft (300). Cover structure (120) is provided with drainage hole (1212), drainage hole (1212) is communicated with annular groove (320), and relative to the up-down direction of pitch shaft (300), drainage hole (1212) is located below pitch shaft (300). The adapter end also has an adapter end face adjacent to the circumference of the adapter end, and the pitch shaft dynamic sealing structure further includes: A first sealing ring (400) is fixed to the adapter end face, and the first sealing ring (400) is configured to be sealingly sandwiched between the suspension frame (1) and the adapter end face.

2. The dynamic seal structure for a pitch axis according to claim 1, characterized by, The adapter end face is provided with a first assembly groove (330), and the first sealing ring (400) is arranged in the first assembly groove (330); and / or 3. The dynamic seal structure for a pitch axis as set forth in claim 1, wherein The bearing (200) has two, and the pitch shaft dynamic sealing structure further includes a bearing pad (500) sandwiched between the two adjacent bearings (200); and / or 4. The dynamic seal structure for a pitch axis as set forth in claim 1, wherein A plurality of connection holes (340) are provided on the adapter end face, and the plurality of connection holes (340) are configured to be fastened and connected with the suspension frame (1) by fasteners. The bearing seat assembly (100) includes:

5. The dynamic seal structure for a pitch axis as set forth in claim 4, wherein A carrier body (110) in which the first through-hole (111) is formed; A plurality of cover units (121) are detachably fixed to the carrier body (110), and each cover unit (121) is arranged around the pitch shaft (300); ​ 6. The pitch axis dynamic seal structure of any of claims 1-5, wherein, ​ ​ ​ Each of the cover monomers (121) is sealed and matched with each other to form the cover structure (120); or each of the cover monomers (121) and the carrier body (110) are sealed and matched with each other to form the cover structure (120).

7. The pitch axis dynamic seal structure of claim 6, wherein, Further comprising: A first sealing gasket (122) is arranged between two adjacent cover monomers (121); and / or, A second sealing ring (600) is arranged between the cover monomer (121) and the carrier body (110).

8. The dynamic seal structure for a pitch axis as set forth in claim 6, wherein The cover monomer (121) is in a circular arc structure extending along the axial direction of the pitch axis (300), and the circumferential angle of each cover monomer (121) is not more than 180°.

9. The pitch axis dynamic seal structure of claim 8, wherein, The cover monomer (121) has two half-circular ring structures.

10. An opto-electronic turret, characterized in that, Comprising: A suspension frame (1) and a bottom frame (2); And A pitch axis assembly (3) is arranged between the suspension frame (1) and the bottom frame (2), and the bottom frame (2) is rotatably connected to the suspension frame (1) through the pitch axis assembly (3), and the bottom frame (2) can be pitch-rotated relative to the suspension frame (1); wherein the pitch axis assembly (3) comprises the pitch axis dynamic sealing structure according to any one of claims 1-9.

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