Rotary tightness adjusting buckle and corresponding mask
The rotating tension adjustment mechanism addresses fit issues in masks by enabling easy and secure strap length adjustment, improving user comfort and convenience.
Patent Information
- Application Number
- CN202422453341.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-10
AI Technical Summary
The length of the existing masks is not adjustable, which causes people with different face shapes to feel different when wearing them. They may feel discomfort or wear them poorly when worn for a long time, and the adjustment process of the tied mask is inconvenient.
The rotary elastic adjustment buckle is adopted, including the first adjustment member and the second adjustment member, and the length adjustment of the mask belt is adjusted through the rotary connection, and the mask belt is clamped with the accommodating groove and the runway-shaped hole structure to ensure the length is adaptable.
It realizes convenient adjustment of the length of the mask belt, improves the wear comfort and usage experience, avoids the problem of ear tightening and the mask not fitting, and simplifies the binding process.
Smart Images
Figure CN223094930U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of adjusting buckles, in particular to a rotary tightening adjusting buckle and a corresponding mask. Background Art
[0002] For the masks in the prior art, fixing straps with elasticity (i.e., elastic bands) are generally provided on both sides. The two ends of each fixing strap are respectively fixed to the edge of the mask. During use, people wear the fixing straps behind their ears and use their ears to hold the fixing straps. Since the face shapes of different people are different, when wearing the same mask, due to the non-adjustable length of the fixing straps, the wearing feelings of people with different face shapes will vary greatly. Although the fixing straps have a certain elasticity, if a person has a larger face shape, etc., when wearing the mask for a long time, the tightened fixing straps will tighten the area behind the ears, resulting in discomfort. If a person has a smaller face shape, it will cause the mask not to fit the face well, affecting the wearing effect. In another type of tied mask, the user can tie the mask straps by themselves to a suitable length, but the tying process requires multiple adjustments, which is inconvenient to use.
[0003] Therefore, it is necessary to provide a rotary tightening adjusting buckle and a corresponding mask to solve the above technical problems. Summary of the Utility Model
[0004] The utility model provides a rotary tightening adjusting buckle and a corresponding mask, which are convenient to use and improve the user experience.
[0005] The technical solution of the utility model is as follows:
[0006] A rotary tightening adjusting buckle for connecting two mask straps, comprising:
[0007] A first adjusting member provided with a first adjusting hole for a mask strap to pass through;
[0008] A second adjusting member provided with a second adjusting hole for another mask strap to pass through. The second adjusting member is rotatably connected to the first adjusting member, and the rotation axes of the two, the axis of the first adjusting hole, and the axis of the second adjusting hole are parallel. The first adjusting member includes a first position and a second position on its rotation trajectory. When the second adjusting member is in the first position, the first adjusting hole and the second adjusting hole are misaligned. When the second adjusting member is in the second position, the first adjusting hole and the second adjusting hole are opposite, and the first adjusting member and the second adjusting member can clamp the two mask straps.
[0009] In the rotation tightening and loosening adjusting buckle of the present utility model, a first receiving groove is provided on the surface of the first adjusting member facing the second adjusting member. The first receiving groove penetrates through one side surface of the first adjusting member, and the first adjusting hole is arranged at the bottom of the first receiving groove; a second receiving groove is provided on the surface of the second adjusting member facing the first adjusting member. The second receiving groove penetrates through one side surface of the second adjusting member, and the second adjusting hole is arranged at the bottom of the second receiving groove.
[0010] In the rotation tightening and loosening adjusting buckle of the present utility model, the first receiving groove has opposite first opening end and first closed end. The first opening end penetrates through one side surface of the first adjusting member, and the first closed end is closer to the first adjusting hole relative to the first opening end; the second receiving groove has opposite second opening end and second closed end. The second opening end penetrates through one side surface of the second adjusting member, and the second closed end is closer to the second adjusting hole relative to the second opening end.
[0011] In the rotation tightening and loosening adjusting buckle of the present utility model, the first adjusting hole is in a runway shape, and the length direction of the first adjusting hole is perpendicular to the arrangement direction of the first opening end and the first closed end; the second adjusting hole is in a runway shape, and the length direction of the second adjusting hole is perpendicular to the arrangement direction of the second opening end and the second closed end.
[0012] In the rotation tightening and loosening adjusting buckle of the present utility model, the first adjusting member includes a substrate, a connecting column and a limiting block; the first adjusting hole is arranged on the substrate, and the connecting column protrudes from the substrate; the limiting block is connected to the end of the connecting column away from the substrate, and the limiting block protrudes from the periphery of the connecting column;
[0013] The second adjusting member is further provided with a connecting hole; the connecting column is press-fitted in the connecting hole, and the two are rotationally matched, and the limiting block is located on the side of the second adjusting member away from the substrate.
[0014] In the rotation tightening and loosening adjusting buckle of the present utility model, the connecting hole is oval, the cross-section of the limiting block is circular, the major diameter of the connecting hole is greater than or equal to the diameter of the limiting block, and the minor diameter of the connecting hole is less than the diameter of the limiting block;
[0015] The connecting column is cylindrical, and its diameter is less than the major diameter of the connecting hole and greater than the minor diameter of the connecting hole.
[0016] In the rotation tightening and loosening adjusting buckle of the present utility model, the limiting block is in a frustum shape, and the diameter of the end away from the substrate is less than the diameter of the end close to the substrate.
[0017] In the rotation tightening adjustment buckle of the present utility model, the second adjustment member is a long strip-shaped block, the second adjustment hole and the connection hole are arranged along the length direction of the second adjustment member, and the long diameter direction of the connection hole is consistent with the length direction of the second adjustment member.
[0018] In the rotation tightening adjustment buckle of the present utility model, the first adjustment member has a first flat surface and a first arc surface facing away from each other, the first adjustment hole penetrates through the first flat surface and the first arc surface, and one end of the first adjustment member close to the first adjustment hole is arc-shaped; the second adjustment member has a second flat surface and a second arc surface facing away from each other, the second adjustment hole penetrates through the second flat surface and the second arc surface, and one end of the second adjustment member close to the second adjustment hole is arc-shaped, and the first flat surface and the second flat surface are attached to each other.
[0019] Another technical solution of the present utility model is:
[0020] A mask, which includes:
[0021] A mask body, which includes a mask cloth and a plurality of mask straps; the plurality of mask straps are divided into two groups, each group has two mask straps, and each group of mask straps is respectively connected to opposite ends of the mask cloth; and,
[0022] Two of the above-mentioned rotation tightening adjustment buckles, and the two mask straps in the same group respectively pass through the first adjustment hole and the second adjustment hole of the same rotation tightening adjustment buckle.
[0023] Compared with the prior art, the beneficial effects of the present utility model are: for the rotation tightening adjustment buckle and the mask of the present utility model, when in use, first rotate the second adjustment member to the first position, and respectively pull the mask straps passing through the first adjustment hole and the second adjustment hole to adjust the lengths of the two mask straps, and then rotate the second adjustment member to the second position, the first adjustment member and the second adjustment member can clamp the two mask straps, so that the two mask straps will not shift, thereby adjusting the total length formed by the two mask straps and the rotation tightening adjustment buckle to a length suitable for the user, and the adjustment is convenient. The rotation tightening adjustment buckle and the mask of the present utility model are convenient to use and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following briefly introduces the drawings required to be used in the embodiments. The drawings in the following description are only the corresponding drawings of some embodiments of the present utility model.
[0025] Figure 1 It is a schematic structural diagram of the first adjustment member provided by the first preferred embodiment of the present utility model.
[0026] Figure 2 Structural schematic diagram of the second adjusting member provided in the first preferred embodiment of the present utility model.
[0027] Figure 3 Front view structural schematic diagram of the second adjusting member provided in the first preferred embodiment of the present utility model.
[0028] Figure 4 Structural schematic diagram of the first adjusting member provided in the second preferred embodiment of the present utility model.
[0029] Figure 5 Another angle structural schematic diagram of the first adjusting member provided in the second preferred embodiment of the present utility model.
[0030] Figure 6 Structural schematic diagram of the second adjusting member provided in the second preferred embodiment of the present utility model.
[0031] Wherein,
[0032] 11. First adjusting member, 111. First adjusting hole, 112. First receiving groove, 1121. First open end, 1122. First closed end, 113. Substrate, 114. Connecting column, 115. Limiting block, 116. First flat surface, 117. First arc surface
[0033] 12. Second adjusting member, 121. Second adjusting hole, 122. Second receiving groove, 1221. Second open end, 1222. Second closed end, 123. Connecting hole, 124. Second flat surface, 125. Second arc surface.
[0034] In the figure, units with similar structures are denoted by the same reference numerals. Detailed implementation manners
[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.
[0036] The directional terms mentioned in the present utility model, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", "top" and "bottom", etc., are only with reference to the orientation of the accompanying drawings. The directional terms used are for explaining and understanding the present utility model, rather than for limiting the present utility model.
[0037] In the terms of this utility model, words such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance, nor as limiting the order of precedence.
[0038] In this utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0039] In the existing masks, elastic fixing bands (i.e., elastic bands) are generally provided on both sides. The two ends of each fixing band are respectively fixed on the edge of the mask. When people use the mask, they wear the fixing band behind the ears and use the ears to hold the fixing band. Since the face shapes of different people are different, when wearing the same mask, due to the non-adjustable length of the fixing band, there will be a great difference in the wearing feelings of people with different face shapes. Although the fixing band has a certain elasticity, if a person has a larger face shape, etc., when wearing the mask for a long time, the tightened fixing band will tighten the area behind the ears, resulting in discomfort. If a person has a smaller face shape, it will cause the mask not to fit the face, affecting the wearing effect. In another type of tied-mask, the user can tie the mask band by himself to a suitable length of the mask band, but it needs to be adjusted many times during the tying process, which is inconvenient to use.
[0040] The following is a preferred embodiment of a mask provided by this utility model that can solve the above technical problems.
[0041] The first preferred embodiment of this utility model provides a mask, which includes a mask body and two rotary tension adjustment buckles. The mask body includes a mask cloth and multiple mask bands. The multiple mask bands are divided into two groups, and each group of masks has two mask bands. Each group of mask bands is respectively connected to the opposite ends of the mask cloth. The mask body can be a tied-mask body, which usually has four mask bands and can be connected through rotary tension adjustment buckles pairwise. The mask body can also be an elastic fixing band, that is, among the four mask bands, two are connected as a whole, and the rotary tension adjustment buckle is arranged on the overall belt-shaped structure formed by the two mask bands.
[0042] Please refer to Figure 1 and Figure 2, two rotary tightening adjustment buckles are respectively used to connect two groups of mask straps. The rotary tightening adjustment buckle includes a first adjustment member 11 and a second adjustment member 12. The first adjustment member 11 is provided with a first adjustment hole 111, and a mask strap passes through the first adjustment hole 111. The second adjustment member 12 is provided with a second adjustment hole 121, and the other mask strap in the same group passes through the second adjustment hole 121. The second adjustment member 12 is rotationally connected to the first adjustment member 11, and the rotation axes of the two, the axis of the first adjustment hole 111, and the axis of the second adjustment hole 121 are parallel to each other. The first adjustment member 11 includes a first position and a second position on its rotation trajectory. When the second adjustment member 12 is located at the first position, the first adjustment hole 111 and the second adjustment hole 121 are misaligned; when the second adjustment member 12 is located at the second position, the first adjustment hole 111 and the second adjustment hole 121 are opposite, and the first adjustment member 11 and the second adjustment member 12 can clamp the two mask straps in the same group.
[0043] When the rotary tightening adjustment buckle and the mask of the present utility model are in use, first rotate the second adjustment member 12 to the first position, and respectively pull the mask straps passing through the first adjustment hole 111 and the second adjustment hole 121 to adjust the lengths of the two mask straps. Then rotate the second adjustment member 12 to the second position, and the first adjustment member 11 and the second adjustment member 12 can clamp the two mask straps, so that the two mask straps will not shift, thereby adjusting the total length formed by the two mask straps and the rotary tightening adjustment buckle to a length suitable for the user, which is convenient to adjust. The rotary tightening adjustment buckle and the mask of the present utility model are convenient to use and improve the user experience.
[0044] Please continue to refer to Figure 1 and Figure 2 , a first accommodation groove 112 is provided on the surface of the first adjustment member 11 facing the second adjustment member 12. The first accommodation groove 112 penetrates through one side surface of the first adjustment member 11, and the first adjustment hole 111 is provided at the bottom of the first accommodation groove 112. A second accommodation groove 122 is provided on the surface of the second adjustment member 12 facing the first adjustment member 11. The second accommodation groove 122 penetrates through one side surface of the second adjustment member 12, and the second adjustment hole 121 is provided at the bottom of the second accommodation groove 122. To ensure the firmness of the mask strap, the mask strap usually has a certain thickness. When the second adjustment member 12 is located at the second position, the first accommodation groove 112 can accommodate the mask strap passing through the first adjustment hole 111, and the second accommodation groove 122 can accommodate the mask strap passing through the second adjustment hole 121, preventing the two mask straps from being stacked together too thickly, resulting in excessive extrusion pressure on the first adjustment member 11 and the second adjustment hole 121 and causing damage and separation between the two.
[0045] Please continue to refer to Figure 1 and Figure 2, the first receiving groove 112 has opposite first open end 1121 and first closed end 1122. The first open end 1121 penetrates through one side surface of the first adjusting member 11, and the first closed end 1122 is closer to the first adjusting hole 111 relative to the first open end 1121. The second receiving groove 122 has opposite second open end 1221 and second closed end 1222. The second open end 1221 penetrates through one side surface of the second adjusting member 12, and the second closed end 1222 is closer to the second adjusting hole 121 relative to the second open end 1221. With the above structure, when the second adjusting member 12 is in the second position, the two mask straps respectively pass out from the first open end 1121 and the second open end 1221. The first open end 1121 is farther away from the first adjusting hole 111, and the second open end 1221 is farther away from the second adjusting hole 121, which can make the overlapping part of the two mask straps larger, so that the two mask straps are fixed more stably.
[0046] Please continue to refer to Figure 1 and Figure 2 , the first adjusting hole 111 is in a racetrack shape, and the length direction of the first adjusting hole 111 is perpendicular to the arrangement direction of the first open end 1121 and the first closed end 1122. The second adjusting hole 121 is in a racetrack shape, and the length direction of the second adjusting hole 121 is perpendicular to the arrangement direction of the second open end 1221 and the second closed end 1222. The mask straps are generally flat. The first adjusting hole 111 and the second adjusting hole 121 with the above structure are convenient for the two mask straps to pass through and are convenient for the two mask straps to respectively pass out from the first open end 1121 and the second open end 1221.
[0047] Please continue to refer to Figure 1 and Figure 2 , the first adjusting member 11 includes a substrate 113, a connecting column 114 and a limiting block 115. The first adjusting hole 111 is arranged on the substrate 113, and the connecting column 114 protrudes from the substrate 113. The limiting block 115 is connected to the end of the connecting column 114 away from the substrate 113, and the limiting block 115 protrudes from the periphery of the connecting column 114. The second adjusting member 12 is also provided with a connecting hole 123. The connecting column 114 is press-fitted in the connecting hole 123, and the two are rotationally matched. The limiting block 115 is located on the side of the second adjusting member 12 away from the substrate 113. In the above structure, the connecting column 114 and the connecting hole 123 are rotationally matched, which can make the second adjusting member 12 switch between the first position and the second position; the connecting column 114 is press-fitted in the connecting hole 123. When the second adjusting member 12 is in the second position, a relatively large force is required to make the second adjusting member 12 rotate, effectively preventing the second adjusting member 12 from randomly changing its position.
[0048] Please refer to Figure 1 and Figure 3, the connection hole 123 is oval, the cross-section of the limiting block 115 is circular, the major diameter of the connection hole 123 is greater than or equal to the diameter of the limiting block 115, and the minor diameter of the connection hole 123 is less than the diameter of the limiting block 115. When assembling the first adjusting member 11 and the second adjusting member 12, first insert the limiting block 115 into the connection hole 123. The limiting block 115 becomes similar to an oval shape under the extrusion of the connection hole 123. Since the major diameter of the connection hole 123 is greater than or equal to the diameter of the limiting block 115, the limiting block 115 can pass through the connection hole 123; when the limiting block 115 passes through the connection hole 123, it returns to its original shape. Since the minor diameter of the connection hole 123 is less than the diameter of the limiting block 115, the limiting block 115 can be limited to one side of the connection hole 123, so that the first adjusting member 11 and the second adjusting member 12 cannot be separated.
[0049] Please continue to refer to Figure 1 and Figure 3 , the connection column 114 is cylindrical, its diameter is less than the major diameter of the connection hole 123 and greater than the minor diameter of the connection hole 123, so that the side wall of the connection column 114 is in partial contact with the side wall of the connection hole 123 and there is an extrusion force between them. By applying a certain magnitude of force to the second adjusting member 12, the connection column 114 can rotate in the connection hole 123, but will not rotate randomly, that is, the second adjusting member 12 can be switched between the first position and the second position, but will not shift randomly.
[0050] Please refer to Figure 1 , the limiting block 115 is frustum-shaped, and the diameter of the end away from the substrate 113 is less than the diameter of the end close to the substrate 113. With the above structure, when assembling the first adjusting member 11 and the second adjusting member 12, it is convenient to insert the limiting block 115 into the connection hole 123.
[0051] Please refer to Figure 1 and Figure 2 , the second adjusting member 12 is a long strip-shaped block, the second adjusting hole 121 and the connection hole 123 are arranged along the length direction of the second adjusting member 12, and the major diameter direction of the connection hole 123 is consistent with the length direction of the second adjusting member 12, which can make the structure compact and will not affect the structural strength of the second adjusting member 12.
[0052] Please refer to Figure 4 、 Figure 5 and Figure 6, a rotary tightening adjustment buckle provided for the second preferred embodiment of the present utility model. The difference from the first embodiment is that the first adjusting member 11 has opposite first flat surfaces 116 and first arc surfaces 117. The first adjusting hole 111 penetrates through the first flat surface 116 and the first arc surface 117. One end of the first adjusting member 11 close to the first adjusting hole 111 is arc-shaped. The second adjusting member 12 has opposite second flat surfaces 124 and second arc surfaces 125. The second adjusting hole 121 penetrates through the second flat surface 124 and the second arc surface 125. One end of the second adjusting member 12 close to the second adjusting hole 121 is arc-shaped. The first flat surface 116 and the second flat surface 124 are in contact. In the above structure, when the second adjusting member 12 is in the second position, both the first flat surface 116 and the second flat surface 124 are flat, which can make the contact area between the first adjusting member 11 and the second adjusting member 12 larger, so that the clamping force on the two mask straps is greater; the first arc surface 117, the second arc surface 125, the end of the first adjusting member 11 and the end of the second adjusting member 12 are all arc-shaped, which can reduce the extrusion of the human skin and improve the wearing comfort.
[0053] Working principle of the mask of the first preferred embodiment of the present utility model:
[0054] During use, first rotate the second adjusting members 12 of the two rotary tightening adjustment buckles to the first position, and respectively pull the mask straps passing through the first adjusting hole 111 and the second adjusting hole 121 to adjust the lengths of the two groups of mask straps. Then rotate the second adjusting members 12 of the two rotary tightening adjustment buckles to the second position. One mask strap is located in the first receiving groove 112 and passes through the first opening end 1121. The other mask strap in the same group is located in the second receiving groove 122 and passes through the second opening end 1221. The first adjusting member 11 and the second adjusting member 12 can clamp the two mask straps so that the two mask straps will not shift.
[0055] In this way, the use process of the mask of the first preferred embodiment is completed.
[0056] For the rotary tightening adjustment buckle and the mask of the present utility model, during use, first rotate the second adjusting member to the first position, and respectively pull the mask straps passing through the first adjusting hole and the second adjusting hole to adjust the lengths of the two mask straps. Then rotate the second adjusting member to the second position. The first adjusting member and the second adjusting member can clamp the two mask straps so that the two mask straps will not shift, thereby adjusting the total length formed by the two mask straps and the rotary tightening adjustment buckle to a length suitable for the user, and the adjustment is convenient. The rotary tightening adjustment buckle and the mask of the present utility model are convenient to use and improve the user experience.
[0057] In summary, although the present utility model has been disclosed above with the preferred embodiments, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the concept of the technical solution of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.
Claims
1. A rotary tightening and loosening adjustment buckle for connecting two mask straps, characterized in that, Comprising: A first adjusting member provided with a first adjusting hole for a mask strap to pass through; A second adjusting member provided with a second adjusting hole for another mask strap to pass through. The second adjusting member is rotatably connected to the first adjusting member, and the axial directions of their rotation, the axial direction of the first adjusting hole, and the axial direction of the second adjusting hole are parallel. The first adjusting member includes a first position and a second position on its rotation trajectory. When the second adjusting member is at the first position, the first adjusting hole and the second adjusting hole are misaligned. When the second adjusting member is at the second position, the first adjusting hole and the second adjusting hole are opposite, and the first adjusting member and the second adjusting member can clamp the two mask straps.
2. The rotary tightening and loosening adjusting buckle according to claim 1, characterized in that, A first receiving groove is provided on the surface of the first adjusting member facing the second adjusting member. The first receiving groove penetrates through one side surface of the first adjusting member, and the first adjusting hole is provided at the bottom of the first receiving groove. A second receiving groove is provided on the surface of the second adjusting member facing the first adjusting member. The second receiving groove penetrates through one side surface of the second adjusting member, and the second adjusting hole is provided at the bottom of the second receiving groove.
3. The rotary tightening and loosening adjusting buckle according to claim 2, characterized in that, The first receiving groove has opposite first open end and first closed end. The first open end penetrates through one side surface of the first adjusting member, and the first closed end is closer to the first adjusting hole relative to the first open end. The second receiving groove has opposite second open end and second closed end. The second open end penetrates through one side surface of the second adjusting member, and the second closed end is closer to the second adjusting hole relative to the second open end.
4. The rotary tightening and loosening adjusting buckle according to claim 3, wherein The first adjusting hole is in a shape of a runway, and the length direction of the first adjusting hole is perpendicular to the arrangement direction of the first open end and the first closed end. The second adjusting hole is in a shape of a runway, and the length direction of the second adjusting hole is perpendicular to the arrangement direction of the second open end and the second closed end.
5. The rotary tightening and loosening adjusting buckle according to claim 1, characterized in that, The first adjusting member includes a substrate, a connecting column, and a limiting block. The first adjusting hole is provided on the substrate, and the connecting column protrudes from the substrate. The limiting block is connected to the end of the connecting column away from the substrate, and the limiting block protrudes from the periphery of the connecting column. The second adjusting member is further provided with a connecting hole. The connecting column is press-fitted in the connecting hole and they are rotationally matched, and the limiting block is located on the side of the second adjusting member away from the substrate.
6. The rotation tightening and loosening adjusting buckle according to claim 5, characterized in that, The connecting hole is oval, the cross-section of the limiting block is circular, the major diameter of the connecting hole is greater than or equal to the diameter of the limiting block, and the minor diameter of the connecting hole is less than the diameter of the limiting block. The connecting column is cylindrical, and its diameter is less than the major diameter of the connecting hole and greater than the minor diameter of the connecting hole.
7. The rotation tightening and loosening adjusting buckle according to claim 6, characterized in that, The limiting block is frustum-shaped, and the diameter of its end away from the substrate is less than the diameter of its end close to the substrate.
8. The rotary tightening and loosening adjusting buckle according to claim 6, wherein, The second adjusting member is in a long strip shape, and the second adjusting hole and the connecting hole are arranged along the length direction of the second adjusting member, and the major diameter direction of the connecting hole is consistent with the length direction of the second adjusting member.
9. The rotation tightening and loosening adjusting buckle according to any one of claims 1-8, characterized in that, The first adjusting member has opposite first flat surfaces and a first arc surface, the first adjusting hole penetrates through the first flat surface and the first arc surface, and one end of the first adjusting member close to the first adjusting hole is arc-shaped; the second adjusting member has opposite second flat surfaces and a second arc surface, the second adjusting hole penetrates through the second flat surface and the second arc surface, and one end of the second adjusting member close to the second adjusting hole is arc-shaped, and the first flat surface and the second flat surface are in contact with each other.
10. A mask, characterized in that, Including: A mask body, which includes a mask cloth and a plurality of mask straps; the plurality of mask straps are divided into two groups, each group of mask straps has two mask straps, and each group of mask straps is respectively connected to opposite ends of the mask cloth; and, Two rotation and tension adjusting buckles according to any one of claims 1-9, and two mask straps in the same group respectively pass through the first adjusting hole and the second adjusting hole of the same rotation and tension adjusting buckle.