CN114439851B - Linear slide rail - Google Patents
Linear slide rail Download PDFInfo
- Publication number
- CN114439851B CN114439851B CN202011216290.5A CN202011216290A CN114439851B CN 114439851 B CN114439851 B CN 114439851B CN 202011216290 A CN202011216290 A CN 202011216290A CN 114439851 B CN114439851 B CN 114439851B
- Authority
- CN
- China
- Prior art keywords
- section
- dust
- end cover
- accommodating space
- linear slide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000428 dust Substances 0.000 claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 238000007790 scraping Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000004308 accommodation Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005945 translocation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/02—Sliding-contact bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/08—Arrangements for covering or protecting the ways
- F16C29/084—Arrangements for covering or protecting the ways fixed to the carriage or bearing body movable along the guide rail or track
- F16C29/088—Seals extending in the longitudinal direction of the carriage or bearing body
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bearings For Parts Moving Linearly (AREA)
Abstract
The utility model provides a linear slide includes dustproof subassembly, slide rail and slides and locates the slider of slide rail, dustproof subassembly includes two dust proof pieces, every the dust proof piece includes first section and second section, first section includes first end and for the second end of first end, the second end of first section is connected the first end of second section, first section and second section form the recess, the second section still includes at least one location portion, at least one location portion with the first end of first section is used for being fixed in linear slide rail to restrict the dust proof piece with linear slide rail's relative displacement.
Description
Technical Field
The invention relates to a dustproof technology, in particular to a linear slide rail and a dustproof component thereof.
Background
The dust-proof component of the conventional linear slide rail is shown in fig. 1, and mainly comprises two dust-proof sheets A2. When the dust-proof sheets A2 are assembled in the linear slide rail, one end of each dust-proof sheet A2 is firstly placed in a groove a13 formed between the end cover bottom surface a11 and the end cover side surface a12 of the end cover A1, and then the other ends of the two dust-proof sheets A2 are pressed in the direction of the end cover bottom surface a11, so that the tooth structures on the other ends of the two dust-proof sheets A2 are abutted against each other. However, since the tooth-shaped structures of the two dust-proof sheets A2 are merely overlapped against each other, the dust-proof sheets A2 are liable to collapse due to the force when they come into contact with the slide rail. Further, since the dust-proof sheet A2 is not fixed in the rail radial direction, a part of the dust-proof sheet A2 is easily caught between the rail and the slider, and the linear rail is abnormal in resistance.
Disclosure of Invention
Therefore, the main object of the present invention is to provide a linear slide and a dustproof assembly thereof, so as to avoid abnormal resistance caused by that the dustproof assembly in a part of the dustproof assemblies falls between a sliding block and the slide.
According to an embodiment of the present invention, a dust-proof assembly of a linear slide rail, the linear slide rail includes a slide rail and a slider slidably disposed on the slide rail, the dust-proof assembly includes: the dustproof sheet comprises a first section and a second section, wherein the first section comprises a first end and a second end opposite to the first end, the second end of the first section is connected with the first end of the second section, the first section and the second section form a groove, the second section further comprises at least one positioning part, and the at least one positioning part and the first end of the first section are used for being fixed on the linear slide rail so as to limit the relative displacement of the dustproof sheet and the linear slide rail.
The present invention provides a linear slide according to an embodiment, comprising: the sliding block comprises a first accommodating space; the two end covers are arranged on two opposite sides of the sliding block respectively, each end cover comprises an end cover bottom surface and two opposite end cover side surfaces, a second accommodating space is formed between the end cover bottom surface and the two end cover side surfaces, the second accommodating space is communicated with the first accommodating space, the end cover bottom surface comprises a first limiting part, and each end cover side surface comprises at least one second limiting part; the sliding rail is used for penetrating through the first accommodating space and the second accommodating space; and the two dustproof sheets are arranged in the first accommodating space and the second accommodating space in a separated manner along the central axis of the linear slide rail, the first end of the first section of each dustproof sheet is used for propping against the first limiting part on the bottom surface of the end cover, the at least one positioning part of the second section of each dustproof sheet corresponds to the at least one second limiting part on the side surface of the end cover respectively and is used for being clamped to the at least one second limiting part, and the positioning parts correspond to the second limiting parts in a shape matching manner.
Therefore, the linear slide rail and the dustproof component thereof can limit the displacement of the dustproof sheet by the positioning parts of the first end and the second section of the first section of the dustproof sheet so as to avoid the abnormal resistance caused by the fact that part of the dustproof sheet falls into the space between the sliding block and the slide rail.
Drawings
FIG. 1 is a schematic view of a dust assembly of a conventional linear slide;
FIG. 2 is a schematic view of an embodiment of a linear guide rail according to the present invention;
FIG. 3 is an exploded view of the linear slide of FIG. 2 according to one embodiment;
FIG. 4 is a side view of a linear slide rail with an end cap removed from a metal blade to show the end cap, dust assembly, slider and slide rail configuration in accordance with one embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of the linear guide of FIG. 4 according to one embodiment of the present invention;
FIG. 6 is a schematic view of a dust assembly mounted on a linear guide according to an embodiment of the present invention;
FIG. 7 is an enlarged partial cross-sectional view of the linear slide taken along section line 7-7 of FIG. 2 to illustrate the dust assembly installed in the linear slide against the oil scraper disposed inside the end cap in accordance with one embodiment of the present invention;
FIG. 8 is an enlarged view of a portion of the linear guide of FIG. 4 showing the installation of another dust assembly to the linear guide according to another embodiment of the present invention;
FIG. 9 is an enlarged view of a portion of the linear guide of FIG. 4 showing a further dust assembly in another linear guide according to still another embodiment of the present invention; and
FIG. 10 is an enlarged partial view of a cross-sectional view of the linear slide taken along section line 7-7 of FIG. 2 to illustrate the dust assembly installed in the linear slide against the wiper member disposed outside the end cap in accordance with another embodiment of the present invention.
The reference symbols in the drawings indicate:
10 slider
20,20',80 end caps
21 end cap bottom surface
211 first limit part of end cover bottom surface
2111 supporting section of the first stop portion
2112 extension of the first stop portion
22,82 side surfaces of end caps
221,821 second limit part
30 sliding rail
40,40': oil scraper
50,60,70 dustproof sheet
51,61,71 first section of dust-proof sheet
511,611 first end of first section
512,612 second end of the first section
52,72 second section of dust-proof sheet
521,721 first end of the second section
522,722 second end of the second section
523,723 positioning part of the second section
53,73 third section of dust-proof sheet
613,713 the bend of the first section
724 extension section
74 fourth section of dust sheet
54,76 outer surfaces of dust-proof sheets
55 inner surface of dust-proof sheet
A1 end cap
A11 bottom surface of end cover
A12 side surfaces of end caps
A13 groove
A2 dustproof sheet
D1 first axis
D2 second axis
H1 first accommodation space
H2, the second accommodation space
H3 third accommodation space
Center shaft of linear slide rail
R1, R2, R3, R31, R32, R4, R5, H1, groove
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 2 to 7, a linear sliding rail according to an embodiment of the present invention mainly includes a sliding block 10, two end caps 20, a sliding rail 30 and two oil scraping members 40. The slider 10 includes a first accommodating space H1. The two end caps 20 are respectively positioned at opposite ends of the slider 10 along the central axis P of the linear slide rail. Each end cap 20 comprises an end cap bottom surface 21 and two opposite end cap side surfaces 22, the two end cap side surfaces 22 are respectively located at two opposite sides of the end cap bottom surface 21, and the end cap bottom surface 21 and the two end cap side surfaces 22 form a second accommodating space H2 capable of communicating with the first accommodating space H1. The two oil scraping members 40 are respectively disposed on the two end caps 20. Each oil scraping member 40 includes a third accommodating space H3 capable of communicating with the first accommodating space H1 and the corresponding second accommodating space H2. Therefore, the sliding rail 30 can penetrate the first accommodating space H1 of the sliding block 10, the second accommodating space H2 of the two end caps 20, and the third accommodating space H3 of the two oil scraping members 40 along the central axis P.
The linear sliding rail of the present embodiment further comprises a dust-proof component, and the dust-proof component comprises two identical dust-proof sheets 50 disposed between the sliding block 10 and the sliding rail 30. The dust-proof sheet 50 may be a uniform cross-sectional area elongated structure manufactured by, for example, injection molding of plastic, to reduce manufacturing costs and avoid deformation of injection molding during manufacturing. Each dust-proof sheet 50 includes a first section 51 and a second section 52. The first section 51 includes a first end 511 and a second end 512 opposite the first end 511, and the second section 52 includes a first end 521 and a second end 522 opposite the first end 521. The second end 512 of the first section 51 is connected to the first end 521 of the second section 52. The first end 511 of the first section 51 is configured to be fixed to the end cap 20 of the linear guide to limit the relative displacement between the dust-proof sheet 50 and the linear guide.
The first section 51 and the second section 52 may form a recess R1 in cooperation with the shape of the end cap side surface 22 of the end cap 20, the recess R1 being configured to receive the top of the slide rail 30, as shown in fig. 5. In detail, the first section 51 extends along the first axis D1 to be flat, and at least part of the second section 52 extends along the second axis D2. The first axis D1 and the second axis D2 are substantially perpendicular to the central axis P of the linear slide, and the first axis D1 is not parallel to the second axis D2, e.g., the first axis D1 is substantially perpendicular to the second axis D2.
The second section 52 further includes at least one positioning portion 523, wherein the positioning portion 523 is configured to be fixed to the end cap 20 of the linear guide to limit the relative displacement between the dust-proof sheet 50 and the linear guide. In the embodiment of fig. 5, the second section 52 includes two positioning portions 523. The two positioning portions 523 are located at the first end 521 and the second end 522 of the second section 52, respectively.
In addition, the end cap 20 includes two first limiting portions 211 on the bottom surface 21 of the end cap, and the two first limiting portions 211 may be symmetrically disposed. The end cap 20 includes at least one second limiting portion 221 on each end cap side surface 22, and the second limiting portion 221 on one end cap side surface 22 and the second limiting portion 221 on the other end cap side surface 22 may be symmetrically disposed. The first limiting portion 211 may be protruding from the bottom surface 21 of the end cap. The first stopper 211 may, for example, include a support section 2111 extending along the first axis D1 and an extension section 2112 extending along the second axis D2, the support section 2111 and the extension section 2112 forming a groove H1, but the present invention is not limited thereto. The number, shape and position of the second limiting portions 221 may be designed according to the number, shape and position of the positioning portions 523 on the dust-proof sheet 50. For the embodiment of fig. 6, when the number of the positioning portions 523 on the dust-proof sheet 50 is 2, the positioning portions 523 are recessed from the outer surface 54 of the second section 52 of the dust-proof sheet 50, and the positioning portions 523 are respectively located at the first end 521 and the second end 522 of the second section 52, the number of the second limiting portions 221 on the end cover side surface 22 is also 2, the second limiting portions 221 are protruding from the end cover side surface 22, and the positions of the second limiting portions 221 on the end cover side surface 22 are also corresponding to the positions of the positioning portions 523 on the second section 52 when the dust-proof sheet 50 is placed in the end cover 20.
The dust-proof component can be assembled to the linear guide rail after the end cap 20 is assembled to the slider 10. When the dust-proof assembly is to be mounted on the linear slide, as shown in fig. 3 and 6, the two dust-proof sheets 50 can be placed in the first accommodating space H1 and the second accommodating space H2 along the central axis P of the linear slide. The two dust-proof sheets 50 are provided separately from each other and fixed to the two end caps 20. In detail, the second section 52 of the dust-proof sheet 50 is first supported against the end cover side surface 22 along the second axis D2, and the second section 52 of the dust-proof sheet 50 and the end cover side surface 22 of the end cover 20 are mutually positioned by the positioning portion 523 on the second section 52 and the second limiting portion 221 on the end cover side surface 22, for example, the positioning portion 523 and the second limiting portion 221 are mutually engaged to limit the relative displacement of the second section 52 and the end cover side surface 22 along the first axis D1. Next, the first end 511 of the first section 51 of the dust-proof sheet 50 is pressed into the groove H1 of the first limiting portion 211 along the first axis D1, so that the first end 511 of the first section 51 abuts against the first limiting portion 211 of the end cover bottom 21. Specifically, the end surface of the first end 511 of the first section 51 abuts against the support section 2111 of the first limiting portion 211, and the inner surface 55 located at the first end 511 of the first section 51 opposite to the outer surface 54 contacts the extension section 2112 of the first limiting portion 211, such that the first end 511 of the first section 51 is supported by the first limiting portion 211. Thereby, the relative displacement of the first section 51 and the end cap bottom surface 21 along the first axis D1 and the second axis D2 is restricted. Therefore, the translocation of the dustproof sheet during the operation of the linear slide rail can be avoided, and further the dustproof failure and the occurrence of the condition that the resistance of the linear slide rail is increased due to the fact that part of the dustproof sheet falls between the slide rail and the slide block are avoided.
When the two dust-proof sheets 50 are fixed to the end cover 20, the two dust-proof sheets 50 respectively abut against the two oil scraping members 40 along the opposite ends of the central axis P, as shown in fig. 7, and the two dust-proof sheets 50 may be symmetrically disposed in the linear sliding rail, as shown in fig. 4. In fig. 7, the oil scraping member 40 is disposed inside the end cap 20, and when the end cap 20 is assembled to the slider 10, the oil scraping member 40 cannot be visually observed.
In order to more easily secure the first end 511 of the first section 51 to the first stop 211 of the end cap bottom 21, in this or other embodiments, a chamfer 212 may be provided on the extension 2112 of the first stop 211, as shown in fig. 6.
In this or other embodiments, each dust tab 50 may further include a third section 53 connected to the second end 522 of the second section 52. The second section 52 and the third section 53 may form a groove R2 in cooperation with the shape of the end cap side surface 22 of the end cap 20, as shown in fig. 5. In detail, the third section 53 extends along the first axis D1 from the second section 52 and can contact the sliding rail 30. Since the relative displacement between the dust-proof sheet 50 and the end cover 20 is limited, the relative position between the third section 53 and the slide rail 30 is kept fixed, so that when the third section 53 contacts the slide rail 30, the sealing degree of the linear slide rail can be improved, the dust-proof effect is ensured, and abnormal linear slide rail resistance caused by falling between the slide block 10 and the slide rail 30 due to deformation caused by stress can be avoided.
Although the embodiment is described by taking the example that the first section 51 of the dust-proof sheet 50 is flat and the first end 521 and the second end 522 of the second section 52 are respectively provided with a positioning portion 523 in fig. 5, the invention is not limited thereto. Other embodiments are illustrated below.
Referring to fig. 8, a dust-proof assembly according to another embodiment of the invention includes two dust-proof sheets 60. The dust sheet 60 may be mounted to the end cap 20 shown in fig. 5. The dust-proof sheet 60 is similar to the dust-proof sheet 50 shown in fig. 5. However, the first end 611 and the second end 612 of the first section 61 of the dust-proof sheet 60 may further include a curved portion 613 therebetween. Thus, the first end 611 of the first section 61 is more easily fixed to the first limiting portion 211 of the end cover 20, and even abuts against the first limiting portion 211.
Alternatively, referring to fig. 9, a dust-proof assembly according to another embodiment of the present invention includes two dust-proof sheets 70. The dust sheet 70 includes a first section 71 and a second section 72. The first section 71 and the second section 72 form a groove R3. The first section 71 is similar to the first section 61 of fig. 8, and thus, the description of the first section 71 will be referred to the description of the first section 61, and will not be repeated here. At least a portion of the second section 72 extends along the second axis D2. The second section 72 includes a detent 723. The detent 723 may be recessed from the outer surface 76 of the second section 72 and is located between the first end 721 and the second end 722 of the second section 72.
To correspond to the positioning portion 723 of the second section 72 of the dust-proof sheet 70, the end cover side surface 82 of the end cover 80 may be provided with a second limiting portion 821 thereon, so that the positioning portion 723 of the dust-proof sheet 70 and the second limiting portion 821 are mutually positioned, for example, mutually engaged, to limit the mutual displacement of the second section 72 of the dust-proof sheet 70 and the end cover side surface 82 of the end cover 80 along the second axis D2.
In this or other embodiments, the dust sheet 70 may further comprise a third section 73. The third section 73 connects the second section 72, the second section 72 being located between the first section 71 and the third section 73. The second section 72 and the third section 73 may form a groove R4 in cooperation with the shape of the end cover side surface 82 of the end cover 80. Thus, the sealing degree of the linear slide rail can be improved.
In this or other embodiments, the dust sheet 70 may further include a fourth section 74. The fourth section 74 connects the third section 73, the third section 73 being located between the second section 72 and the fourth section 74. The third section 73 and the fourth section 74 may form a groove R5 in cooperation with the shape of the end cover side surface 82 of the end cover 80. Thus, the sealing degree of the linear slide rail can be improved.
In this or other embodiments, the first end 721 of the second section 72 of the dust sheet 70 may be provided as an extension section 724. One of the opposite ends of the extension section 724 is connected to the first section 71, and the other is the second section 72. The extension section 724 and the first section 71 form a groove R31, and the extension section 724 and the remaining portion of the second section 72 form another groove 32.
Although the above embodiments are described by taking the example that the oil scraping member 40 is disposed inside the end cap 20 in fig. 7, the present invention is not limited to this example; in other embodiments, as shown in FIG. 10, the wiper 40' may be disposed on the exterior of the end cap 20' on the side of the end cap 20' remote from the slider 10. Thus, the wiper 40 'is still visually observable when the end cap 20' is assembled to the slider 10.
Although the above embodiments are described by taking the positioning portion recessed in the second section as an example, the present invention is not limited to this example, as long as the shape of the positioning portion on the dust-proof sheet can match the shape of the corresponding second limiting portion on the side surface of the corresponding end cover. For example, at least one of the positioning portions is protruding on the second section, and the corresponding second limiting portion is concavely arranged on the side surface of the end cover.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A linear slide comprising:
the sliding block comprises a first accommodating space;
the two end covers are arranged on two opposite sides of the sliding block respectively, each end cover comprises an end cover bottom surface and two opposite end cover side surfaces, a second accommodating space is formed between the end cover bottom surface and the two end cover side surfaces, the second accommodating space is communicated with the first accommodating space, the end cover bottom surface comprises a first limiting part, and each end cover side surface comprises at least one second limiting part;
the sliding rail is used for penetrating through the first accommodating space and the second accommodating space; and
the two dustproof sheets are arranged between the sliding rail and the sliding block and used for being arranged in the first accommodating space and the second accommodating space along the central axis of the linear sliding rail, each dustproof sheet comprises a first section and a second section connected with the first section, the first section comprises a first end and a second end opposite to the first end, the second end of the first section is connected with the first end of the second section, the first section and the second section form a groove used for accommodating the top of the sliding rail, the second section further comprises at least one positioning part, the at least one positioning part and the first end of the first section are used for being fixed on the sliding block so as to limit the relative displacement of the dustproof sheet and the sliding block, the first end of the first section is used for propping against the first limiting part of the bottom surface of the end cover, and the at least one positioning part of the second section is clamped with the at least one side of the first end cover respectively.
2. The linear slide of claim 1, wherein the first section extends along a first axis and at least a portion of the second section extends along a second axis, the first axis being non-parallel to the second axis.
3. The linear slide of claim 1, wherein the at least one detent of the dust tab is located between the first end and the second end of the second section.
4. The linear slide of claim 1, wherein the number of the at least one positioning portion of the dust-proof sheet is plural, the plurality of positioning portions being located at the first end and the second end of the second section, respectively.
5. The linear slide of claim 1, wherein the first section further comprises a bend.
6. The linear guide of claim 1, wherein at least one of the positioning portions is recessed in the second section.
7. The linear guide of claim 1, wherein at least one of the positioning portions is protruding from the second section.
8. The linear slide of claim 1, wherein each dust tab further comprises a third section connecting the second ends of the second sections, the second and third sections forming another groove.
9. The linear guide rail of claim 1, further comprising two oil scraping members disposed on the two end caps, wherein each of the dust-proof sheets abuts against the two oil scraping members along opposite ends of the central shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216290.5A CN114439851B (en) | 2020-11-04 | 2020-11-04 | Linear slide rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216290.5A CN114439851B (en) | 2020-11-04 | 2020-11-04 | Linear slide rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114439851A CN114439851A (en) | 2022-05-06 |
| CN114439851B true CN114439851B (en) | 2024-01-30 |
Family
ID=81360919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011216290.5A Active CN114439851B (en) | 2020-11-04 | 2020-11-04 | Linear slide rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114439851B (en) |
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| US9897142B1 (en) * | 2017-02-09 | 2018-02-20 | Hiwin Technologies Corp | Linear slide with dust protection plate |
| JP3218064U (en) * | 2018-07-06 | 2018-09-20 | 上銀科技股▲分▼有限公司 | Slider with dust-proof piece |
| DE102018130979A1 (en) * | 2018-10-02 | 2020-04-02 | Schaeffler Technologies AG & Co. KG | Measuring head for a linear measuring system, carriage with the measuring head and linear measuring system with the carriage |
| DE202019106155U1 (en) * | 2019-11-06 | 2020-02-10 | Hiwin Technologies Corp. | Dust protection element for linear guides and a linear guide with the dust protection element |
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| CN114439851A (en) | 2022-05-06 |
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