Head particle structure with automatically adjustable length and watchband
By designing a head link structure that includes a first head link, a second head link, and an elastic component, the problem of unsuitable watch strap length adjustment was solved, achieving stepless and adaptive adjustment, improving wearing comfort and convenience, and reducing production costs.
Patent Information
- Application Number
- CN202520828883.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-28
AI Technical Summary
Existing watch straps have a wide range of adjustable lengths, making it impossible to adjust to smaller sizes, which leads to discomfort when wearing them and affects the accuracy of PPG testing.
Design a headstock structure including a first headstock, a second headstock, and an elastic component. A stepless adjustment is achieved through a sliding groove and a snap-fit position. The sliding distance is limited by a limiting groove and a protrusion. A riveting process is used to enhance the connection stability. A gasket is used to distribute the force evenly to reduce wear.
It achieves adaptive stepless adjustment of the watch strap length, improving wearing comfort and convenience, preventing the strap from coming off, reducing production costs and simplifying the assembly process.
Smart Images
Figure CN223900348U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of watchband structure, in particular to a head grain structure with automatic length adjustment and a watchband. BACKGROUND
[0002] The current market watchband length adjustment span is large, and it is impossible to realize small size length adjustment of the watchband or self-adaptive adjustment of the watchband length. Generally speaking, the chain watchband realizes the length adjustment of the watchband by disassembling the watch grain, and the soft rubber watchband realizes the length adjustment of the watchband by different fixing holes. The length adjustment span of the above two adjustment modes is large, and the wearing is easy to appear loose or tight, the length of the watchband is difficult to adapt to the size of the user's wrist, and the wearing comfort is poor. In addition, when the watch has PPG detection function, the loose watchband will affect the detection accuracy of PPG. CONTENT OF THE UTILITY MODEL
[0003] In order to solve the above problems, the present application provides a head grain structure with automatic length adjustment and a watchband, which is ingenious in design and simple in structure. The present application can realize self-adaptive adjustment of the length of the head grain structure, and the length adjustment of the head grain structure belongs to endless adjustment without gear division, without manual adjustment control, greatly simplifying the difficulty of adjusting the length of the watchband in a small size range, improving the convenience of adjusting the length of the watchband, and greatly improving the wearing comfort. The technical scheme adopted by the present application is as follows:
[0004] A head grain structure with automatic length adjustment, comprising:
[0005] A first head grain is provided with a sliding groove and at least one clamping position, the sliding groove extends along the length direction of the first head grain, and the clamping position is communicated with the sliding groove on one side; a second head grain is slidably arranged in the sliding groove, the second head grain is provided with at least one accommodating position extending along the length direction thereof, the accommodating position is communicated with the sliding groove on one side, and the accommodating position is provided with a first shoulder; at least one set of elastic component, the elastic component comprises a guide rod and a spring; the guide rod is arranged along the length direction of the second head grain, one end of the guide rod is clamped in the clamping position, the other end of the guide rod is provided with a first flange part and located in the accommodating position; the spring is sleeved on the guide rod and located in the accommodating position, one end of the spring abuts against the first shoulder, and the other end of the spring abuts against the first flange part; in the natural state, the second head grain abuts against the sliding groove under the action of the spring; when the second head grain slides out of the sliding groove, the spring is compressed, and the head grain structure is elongated.
[0006] The head particle structure can realize self-adaptive adjustment of the length of the head particle structure through cooperation of the first head particle, the second head particle and the elastic assembly, and the length adjustment of the head particle structure is stepless adjustment without gear division, without manual adjustment control, greatly simplifying the difficulty of adjusting the length of the watchband in a small size range, improving the convenience of the length adjustment of the watchband, and greatly improving the wearing comfort.
[0007] In some embodiments, opposite sides of the sliding groove are respectively provided with a limiting groove with a preset length, the limiting groove is arranged along the sliding direction of the second head particle, opposite sides of the second head particle are respectively provided with a first protruding part matched with the limiting groove, the first protruding part is slidably arranged in the corresponding limiting groove, the first protruding part and the limiting groove are used to limit the sliding length of the second head particle relative to the first head particle, and the head particle structure reaches the longest state when the first protruding part slides to the end of the limiting groove.
[0008] By arranging the limiting groove and the first protruding part, cooperation of the limiting groove and the first protruding part can limit the sliding distance of the second head particle, so that the sliding distance of the second head particle is limited within the preset length, and the second head particle is prevented from being separated from the sliding groove during the elongation of the head particle structure.
[0009] In some embodiments, the accommodating position is further provided with a second shoulder, the second shoulder is adapted to abut against the first flange part of the guide rod, so as to limit the sliding length of the second head particle relative to the first head particle.
[0010] By cooperation of the second shoulder and the first flange part, when the sliding distance of the second head particle reaches the preset length, the first flange part of the guide rod abuts against the second shoulder, which hinders the second head particle from sliding out of the sliding groove, so that the second head particle is prevented from being separated from the sliding groove during the elongation of the head particle structure.
[0011] In some embodiments, an end of the guide rod away from the first flange part is provided with a second flange part, the second flange part is formed by the guide rod through a riveting process, and the end of the guide rod provided with the second flange part is clamped in the clamping position.
[0012] The second flange part is formed by the riveting process, and compared with the second flange part welded to the end of the guide rod, the connection strength of the second flange part formed by the riveting process and the guide rod is large and stable.
[0013] In some embodiments, a first gasket is sleeved on the guide rod, the first gasket is located on a side of the second flange part close to the first flange part, the radial dimension of the first gasket along the guide rod is larger than that of the second flange part, and the end of the guide rod provided with the second flange part and the first gasket is clamped in the clamping position.
[0014] By arranging the first gasket, the force receiving area of the clamping position is increased, so that the clamping position is uniformly stressed, the stress of the clamping position is reduced, and the wear of the clamping position is reduced, and the risk of failure and damage of the clamping position is reduced.
[0015] In some embodiments, the second flange portion is welded to the first gasket.
[0016] By welding the first gasket to the second flange portion, the integrity of the first gasket and the second flange portion is improved, so that the first gasket and the second flange portion are integrally stressed, and the risk of the first gasket falling off the guide rod is reduced, that is, the risk of failure of the first gasket or the second flange portion is reduced.
[0017] In some embodiments, a second gasket is arranged on the guide rod, and the second gasket is located between the first shoulder and the spring.
[0018] By arranging the second gasket, the end of the spring cannot directly abut against the first shoulder, the second gasket increases the force receiving area of the first shoulder, so that the first shoulder is uniformly stressed, the stress of the spring on the first shoulder is reduced, the wear of the first shoulder is reduced, and the risk of failure and damage of the first shoulder is reduced.
[0019] In some embodiments, the clamping position is a through countersunk hole, the accommodating position is a through hole, and the first bead is integrally formed. The first bead is integrally formed, which can save production cost.
[0020] In some embodiments, the first bead includes a first bead body and a cover plate, the first bead body and the cover plate are distributed along the thickness direction of the first bead; the first bead body is provided with a T-shaped groove and a recess, the T-shaped groove and the recess are sunken along the thickness direction of the first bead body, one side of the T-shaped groove communicates with the recess, the T-shaped groove is the clamping position, and the cover plate and the recess form the sliding groove; the second bead is provided with an accommodating groove, the accommodating groove is sunken along the thickness direction of the second bead, one side of the accommodating groove communicates with the recess, and the accommodating groove is the accommodating position; the cover plate covers the second bead and the elastic assembly, and the edge of the cover plate is connected to the first bead body. The first bead is divided into a first bead body and a cover plate, which can facilitate assembly of the bead structure.
[0021] In another aspect, the application provides a watchband comprising the length-adjustable bead structure.
[0022] The length-adjustable bead structure provided by the application has at least one of the following beneficial effects:
[0023] 1. The length-adjustable head grain structure provided by the application can realize self-adaptive adjustment of the length of the head grain structure through the cooperation of the first head grain, the second head grain and the elastic component, and the length adjustment of the head grain structure belongs to stepless adjustment without gear position distinction, without manual adjustment control, greatly simplifying the difficulty of adjusting the length of the watchband in a small size range, improving the convenience of adjusting the length of the watchband, and greatly improving the wearing comfort.
[0024] 2. The length-adjustable head grain structure provided by the application can limit the sliding distance of the second head grain by setting the limiting groove and the first protruding part, so as to limit the sliding distance of the second head grain within a preset length and prevent the second head grain from being separated from the sliding groove during the elongation of the head grain structure.
[0025] 3. The length-adjustable head grain structure provided by the application can prevent the second head grain from being separated from the sliding groove during the elongation of the head grain structure by the cooperation of the second shoulder and the first flange part when the sliding distance of the second head grain reaches the preset length, so that the first flange part of the guide rod abuts against the second shoulder and prevents the second head grain from further sliding out of the sliding groove.
[0026] 4. The length-adjustable head grain structure provided by the application adopts a riveting process to form the second flange part, which has greater connection strength and stability compared to the welding of the second flange part to one end of the guide rod.
[0027] 5. The length-adjustable head grain structure provided by the application increases the stress area of the clamping position by setting the first gasket, so that the clamping position is uniformly stressed and the stress of the clamping position is reduced, in addition, the wear of the clamping position is also reduced, and the risk of failure and damage of the clamping position is reduced.
[0028] 6. The length-adjustable head grain structure provided by the application improves the integrity of the first gasket and the second flange part by welding the first gasket and the second flange part, so that the first gasket and the second flange part are integrally stressed, reducing the risk of the first gasket falling off the guide rod, that is, reducing the risk of failure of the first gasket or the second flange part.
[0029] 7. The length-adjustable head grain structure provided by the application makes one end of the spring unable to directly abut against the first shoulder by setting the second gasket, and the second gasket increases the stress area of the first shoulder, so that the first shoulder is uniformly stressed and the stress of the first shoulder is reduced, the wear of the first shoulder is reduced, and the risk of failure and damage of the first shoulder is reduced.
[0030] 8. The head grain structure with automatic length adjustment provided by the application has a first head grain integrally formed, thereby saving production cost.
[0031] 9. The head grain structure with automatic length adjustment provided by the application has a first head grain split into a first head grain main body and a cover plate, thereby facilitating assembly of the head grain structure. BRIEF DESCRIPTION OF DRAWINGS
[0032] The above features, technical characteristics, advantages and implementation modes of the head grain structure with automatic length adjustment and the watchband will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings:
[0033] Figure 1 is a schematic diagram of the overall structure of an embodiment of the head grain structure;
[0034] Figure 2 is an exploded view of the embodiment; Figure 1
[0035] Figure 3 is another view of the exploded view of the embodiment; Figure 1
[0036] Figure 4 is a sectional view of the first head grain in the embodiment; Figure 1
[0037] Figure 5 is a sectional view of the second head grain in the embodiment; Figure 1
[0038] Figure 6 is a schematic diagram of the overall structure of an embodiment of the elastic assembly;
[0039] Figure 7 is a sectional view of the embodiment (head grain structure in non-elongated state); Figure 1
[0040] Figure 8 is a sectional view of the embodiment (head grain structure in elongated state); Figure 1
[0041] Figure 9 is a sectional view of the embodiment (head grain structure in longest state); Figure 1
[0042] Figure 10 is a schematic diagram of the overall structure of another embodiment of the head grain structure;
[0043] Figure 11 is a schematic diagram of the structure of the embodiment with the cover plate hidden; Figure 10
[0044] Figure 12 Figure 10 Structure schematic diagram of the first head particle main body in the embodiment;
[0045] Figure 13 is Figure 10 Structure schematic diagram of the second head particle in the embodiment.
[0046] Brief Description of the Drawings
[0047] First head particle 1, chute 2, clamping position 3, second head particle 4, containing position 5, first shoulder 6, guide rod 7, spring 8, first flange part 9, limiting groove 10, first protruding part 11, second shoulder 12, second flange part 13, first gasket 14, second gasket 15, counterbore 16, through hole 17, first head particle main body 18, cover plate 19, T-shaped groove 20, recess 21, containing groove 22, guide groove 23, guide protruding part 24. DETAILED DESCRIPTION
[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and those skilled in the art can obtain other drawings and embodiments according to these drawings without creating any creative labor.
[0049] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".
[0050] It should be further understood that the term "and / or" used in the specification and claims of the present application means any combination of one or more of the associated listed terms and all possible combinations, and includes these combinations.
[0051] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0052] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.
[0053] Referring to Figures 1-13 , the application provides a length-adjustable head structure, comprising: a first head 1, the first head 1 being provided with a sliding groove 2 and at least one clamping position 3, the sliding groove 2 extending along the length direction of the first head 1, and the clamping position 3 being communicated with the sliding groove 2 on one side; a second head 4, the second head 4 being slidably arranged in the sliding groove 2, the second head 4 being provided with at least one accommodating position 5 extending along the length direction of the second head 4, the accommodating position 5 being communicated with the sliding groove 2 on one side, and the accommodating position 5 being provided with a first shoulder 6; at least one set of elastic component, the elastic component comprising a guide rod 7 and a spring 8; the guide rod 7 being arranged along the length direction of the second head 4, one end of the guide rod 7 being clamped in the clamping position 3, and the other end of the guide rod 7 being provided with a first flange part 9 and located in the accommodating position 5; the spring 8 being sleeved on the guide rod 7 and located in the accommodating position 5, one end of the spring 8 abutting against the first shoulder 6, and the other end of the spring 8 abutting against the first flange part 9; in a natural state, the second head 4 abutting against the sliding groove 2 under the action of the spring 8; when the second head 4 slides out of the sliding groove 2, the spring 8 is compressed, and the head structure is elongated.
[0054] For the above-mentioned embodiments, there are various specific implementation schemes, and two specific implementation schemes are exemplarily introduced as follows:
[0055] In one specific embodiment (hereinafter referred to as the first embodiment), referring to Figures 1-9 , the clamping position 3 is a through hole 16, the accommodating position 5 is a through hole 17, and the first head 1 is integrally formed. In this specific embodiment, the first head 1 is integrally formed, which can save production cost.
[0056] In another specific embodiment (hereinafter referred to as the second embodiment), referring to Figure 6 , Figures 10-13 , the first head 1 comprises a first head main body 18 and a cover plate 19, the first head main body 18 and the cover plate 19 being distributed along the thickness direction of the first head 1; the first head main body 18 is provided with a T-shaped groove 20 and a recess 21, the T-shaped groove 20 and the recess 21 both sinking along the thickness direction of the first head main body 18, the T-shaped groove 20 being communicated with the recess 21 on one side, the T-shaped groove 20 being the clamping position 3, and the cover plate 19 and the recess 21 forming the sliding groove 2 in combination; the second head 4 is provided with an accommodating groove 22, the accommodating groove 22 sinking along the thickness direction of the second head 4, the accommodating groove 22 being communicated with the recess 21 on one side, and the accommodating groove 22 being the accommodating position 5; the cover plate 19 covering the second head 4 and the elastic component and the edge of the cover plate 19 being connected to the first head main body 18. It can be understood that the first head 1 is split into two parts of the first head main body 18 and the cover plate 19, which can make the head structure convenient to assemble.
[0057] It should be noted that the first flange part 9 at one end of the guide rod 7 can be formed in various ways, for example, the first flange part 9 and the guide rod 7 are integrally cast, or the first flange part 9 and the guide rod 7 are two independent parts connected by welding, or the first flange part 9 is formed by the guide rod 7 through a riveting process. Preferably, the first flange part 9 is formed by the riveting process.
[0058] Reference Figure 4 , Figure 5 , Figures 7-9 In one embodiment, the opposite sides of the chute 2 are respectively provided with a limiting groove 10 of a predetermined length, and the limiting groove 10 is arranged along the sliding direction of the second head grain 4. The opposite sides of the second head grain 4 are respectively provided with a first protruding part 11 matched with the limiting groove 10. The first protruding part 11 is slidably arranged in the corresponding limiting groove 10. The first protruding part 11 and the limiting groove 10 are used to limit the sliding length of the second head grain 4 relative to the first head grain 1. When the first protruding part 11 slides to the end of the limiting groove 10, the head grain structure reaches the longest state.
[0059] It can be understood that by setting the limiting groove 10 and the first protruding part 11, the cooperation of the limiting groove 10 and the first protruding part 11 can limit the sliding distance of the second head grain 4, and limit the sliding distance of the second head grain 4 within a predetermined length, preventing the second head grain 4 from being separated from the chute 2 during the elongation process of the head grain structure.
[0060] It should be noted that, with reference to Figure 5 , Figures 7-9 In one embodiment, the accommodating position 5 is also provided with a second shoulder 12 adapted to abut against the first flange part 9 of the guide rod 7 to limit the sliding length of the second head grain 4 relative to the first head grain 1. It can be easily understood that through the cooperation of the second shoulder 12 and the first flange part 9, when the sliding distance of the second head grain 4 reaches the predetermined length, the first flange part 9 of the guide rod 7 abuts against the second shoulder 12, which prevents the second head grain 4 from further sliding out of the chute 2, preventing the second head grain 4 from being separated from the chute 2 during the elongation process of the head grain structure.
[0061] It should be noted that in one specific embodiment, only a limiting mechanism formed by the cooperation of the first protruding part 11 and the limiting groove 10 can be provided, or only another limiting mechanism formed by the cooperation of the second shoulder 12 and the first flange part 9 can be provided, or both the two limiting mechanisms can be provided.
[0062] With reference to Figure 3 , Figure 6 , Figures 7-9In one embodiment, the guide rod 7 is provided with a second flange portion 13 at one end away from the first flange portion 9, the second flange portion 13 is formed by the guide rod 7 through a riveting process, and the one end of the guide rod 7 provided with the second flange portion 13 is clamped in the clamping position 3. It is worth noting that the second flange portion 13 is formed by the riveting process, and compared with the second flange portion 13 welded to the one end of the guide rod 7, the connection strength of the second flange portion 13 formed by the riveting process and the guide rod 7 is large and stable.
[0063] It can be understood that, in general, the first head grain 1 and the second head grain 4 are both made of plastic, in order to control the thickness of the entire head grain structure and obtain a larger elongated length under the premise of the same length (the state of the head grain structure not being elongated), the thickness of the clamping position 3 and the first shoulder 6 should be as small as possible. However, the smaller the thickness of the clamping position 3 and the first shoulder 6, the greater the risk of failure and damage of the clamping position 3 and the first shoulder 6.
[0064] In order to reduce the risk of failure and damage of the clamping position 3, with reference to Figure 2 、 Figure 3 、 Figure 6 、 Figures 7-9 、 Figure 11 、 Figure 12 In one embodiment, a first gasket 14 is sleeved on the guide rod 7, the first gasket 14 is located on the side of the second flange portion 13 close to the first flange portion 9, the radial dimension of the first gasket 14 along the guide rod 7 is greater than that of the second flange portion 13, and the one end of the guide rod 7 provided with the second flange portion 13 and the first gasket 14 is clamped in the clamping position 3. By arranging the first gasket 14, the stress area of the clamping position 3 is increased, the clamping position 3 is uniformly stressed, the stress of the clamping position 3 is reduced, and in addition, the wear of the clamping position 3 is reduced, and the risk of failure and damage of the clamping position 3 is reduced.
[0065] In one embodiment, the second flange portion 13 is welded to the first gasket 14. It can be understood that by welding the first gasket 14 to the second flange portion 13, the integrity of the first gasket 14 and the second flange portion 13 is improved, so that the first gasket 14 and the second flange portion 13 are integrally stressed, and the risk of the first gasket 14 falling off the guide rod 7 is reduced, that is, the risk of failure of the first gasket 14 or the second flange portion 13 is reduced.
[0066] In order to reduce the risk of failure and damage of the first shoulder 6, with reference to Figure 5 、 Figure 6 、 Figures 7-9 、 Figure 11 、 Figure 13In one embodiment, the guide rod 7 is sleeved with a second gasket 15, which is located between the first shoulder 6 and the spring 8. By arranging the second gasket 15, the end of the spring 8 cannot directly abut on the first shoulder 6. The second gasket 15 increases the force receiving area of the first shoulder 6, so that the first shoulder 6 is uniformly stressed, the stress of the spring 8 on the first shoulder 6 is reduced, the wear of the first shoulder 6 is reduced, and the risk of failure and damage of the first shoulder 6 is reduced.
[0067] Reference Figures 11-13 For the second embodiment, in one specific embodiment, the concave table 21 is provided with a guide groove 23 on each of the opposite sides, the guide groove 23 is arranged along the sliding direction of the second head grain 4, the second head grain 4 is provided with a guide protrusion 24 on each of the opposite sides, the guide protrusion 24 is slidably arranged in the corresponding guide groove 23. It can be understood that through the cooperation of the guide groove 23 and the guide protrusion 24, the second head grain 4 can only slide relative to the first head grain 1 along the length direction of the first head grain 1, preventing the second head grain 4 from moving relative to the first head grain 1 along the thickness direction of the first head grain 1, avoiding the second head grain 4 from exerting force on the cover plate 19 along the thickness direction of the first head grain 1, and further reducing the risk of separation of the cover plate 19 from the first head grain body 18.
[0068] The present application also provides a watchband comprising the length-adjustable head grain structure. The specific structure of the head grain structure is referred to the foregoing embodiments. Since the watchband adopts the technical solutions of the foregoing embodiments, it at least has the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.
[0069] It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.
Claims
1. A length-adjustable head structure, characterized by, The application relates to a head grain structure, comprising: a first head grain provided with a sliding groove extending along the length direction of the first head grain and at least one clamping position communicating with the sliding groove; a second head grain slidably arranged in the sliding groove, provided with at least one accommodating position extending along the length direction of the second head grain, and provided with a first shoulder in the accommodating position; at least one elastic assembly comprising a guide rod and a spring, wherein the guide rod is arranged along the length direction of the second head grain, one end of the guide rod is clamped in the clamping position, the other end of the guide rod is provided with a first flange part and located in the accommodating position, and the spring is sleeved on the guide rod and located in the accommodating position, one end of the spring abuts against the first shoulder, and the other end of the spring abuts against the first flange part; in a natural state, the second head grain abuts against the sliding groove under the action of the spring; when the second head grain slides out of the sliding groove, the spring is compressed, and the head grain structure is elongated.
2. A self-adjustable length head structure according to claim 1, wherein, opposite sides of the sliding groove are respectively provided with limiting grooves with a preset length, the limiting grooves are arranged along the sliding direction of the second head grain, opposite sides of the second head grain are respectively provided with first protruding parts matched with the limiting grooves, the first protruding parts are slidably arranged in the corresponding limiting grooves, the first protruding parts and the limiting groves are used for limiting the sliding length of the second head grain relative to the first head grain, and the head grain structure reaches the longest state when the first protruding parts slide to the end of the limiting grooves.
3. The self-adjustable length of the head structure according to claim 1, wherein, the accommodating position is further provided with a second shoulder adapted to abut against the first flange part of the guide rod to limit the sliding length of the second head grain relative to the first head grain.
4. The self-adjustable length head structure of claim 1, wherein, one end of the guide rod away from the first flange part is provided with a second flange part, the second flange part is formed by riveting process of the guide rod, and the end of the guide rod provided with the second flange part is clamped in the clamping position.
5. A self-adjustable length head structure according to claim 4, wherein, a first gasket is sleeved on the guide rod, the first gasket is located on the side of the second flange part close to the first flange part, the radial dimension of the first gasket is larger than that of the second flange part, and the end of the guide rod provided with the second flange part and the first gasket is clamped in the clamping position.
6. A self-adjustable length head structure according to claim 5, wherein, the second flange part and the first gasket are welded.
7. The self-adjustable length of the head structure according to claim 1, wherein, a second gasket is sleeved on the guide rod, and the second gasket is located between the first shoulder and the spring.
8. A self-adjustable length head structure according to any one of claims 1-7, wherein, the clamping position is a through hole, the accommodating position is a through hole, and the first head grain is integrally formed.
9. A self-adjustable length head structure according to any one of claims 1-7, wherein, The first head particle comprises a first head particle body and a cover plate, the first head particle body and the cover plate are distributed along the thickness direction of the first head particle; the first head particle body is provided with a T-shaped groove and a recess, the T-shaped groove and the recess are both sunken along the thickness direction of the first head particle body, one side of the T-shaped groove is communicated with the recess, the T-shaped groove is the clamping position, the cover plate and the recess form the sliding groove; the second head particle is provided with a containing groove, the containing groove is sunken along the thickness direction of the second head particle, one side of the containing groove is communicated with the recess, the containing groove is the containing position; the cover plate covers the second head particle and the elastic assembly and the edge of the cover plate is connected to the first head particle body.
10. A watchband, characterized by The head particle structure with automatic length adjustment comprises the head particle structure with automatic length adjustment according to any one of claims 1-9.