Seat armrest

Abstract

The utility model discloses a seat armrest which comprises an adjusting assembly, an armrest assembly and a positioning assembly, the adjusting assembly comprises a mounting seat and a first sliding piece, a vertical first sliding groove is formed in the upper end of the mounting seat, and the first sliding piece is arranged in the first sliding groove in a sliding mode; the handrail assembly is fixed to the upper end of the first sliding piece. The positioning assembly comprises a supporting block and a positioning piece, the supporting block is fixedly connected to the bottom wall of the first sliding groove, the supporting block is movably sleeved with the first sliding piece, a plurality of clamping blocks are arranged on the side wall of the supporting block in a protruding mode, the multiple clamping blocks are arranged at intervals in the vertical direction, the positioning piece is rotationally connected to the first sliding piece, a clamping groove is formed in the positioning piece, and the positioning piece is connected with an elastic piece. The elastic piece can drive the positioning piece to rotate in the direction close to the clamping block so that the clamping block can be clamped into the clamping groove. The height position of the armrest assembly can be adjusted according to needs so as to adapt to use of people with different heights and body materials, and therefore the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seat assemblies, in particular to a seat armrest. Background Art

[0002] Seats usually support users' arms by installing armrests to improve the comfort of seat use. However, the height of existing seat armrests is fixed and cannot be adjusted according to needs to meet the use of people with different heights and body types, resulting in low applicability and easy discomfort during use, affecting the user experience. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the utility model provides a seat armrest that can adjust the height position of the armrest assembly according to needs to adapt to the use of people with different heights and body types, thereby improving the user experience.

[0004] According to an embodiment of the utility model, there is provided a seat armrest, including an adjustment assembly, an armrest assembly, and a positioning assembly. The adjustment assembly includes a mounting base and a first sliding member. A vertical first sliding groove is formed at the upper end of the mounting base, and the first sliding member is slidably disposed in the first sliding groove; the armrest assembly is fixed to the upper end of the first sliding member; the positioning assembly includes a support block and a positioning member. The support block is fixedly connected to the bottom wall of the first sliding groove, the first sliding member is movably sleeved on the support block, a plurality of clamping blocks protrude from the side wall of the support block, and the plurality of clamping blocks are arranged at intervals in the vertical direction. The positioning member is rotatably connected to the first sliding member, a clamping groove is formed in the positioning member, and the positioning member is connected with an elastic member. The elastic member can drive the positioning member to rotate towards the direction close to the clamping block so that the clamping block can be clamped into the clamping groove.

[0005] The seat armrest of the embodiment of the utility model has at least the following beneficial effects: During use, by rotating the positioning member away from the clamping block, the clamping block is disengaged from the clamping groove, and the elastic member is compressed and deformed. At the same time, by vertically lifting the armrest assembly, since the armrest assembly is fixed to the upper end of the first sliding member and the first sliding member is slidably disposed in the first sliding groove, the armrest assembly can drive the first sliding member to slide upward in the first sliding groove when the armrest assembly rises, so that the height position of the armrest assembly can be adjusted. When adjusted to the preset height position, the elastic member elastically returns to drive the positioning member to rotate towards the direction close to the clamping block, so that the clamping block at the corresponding height position is clamped into the clamping groove, thereby fixing the height position of the first sliding member and the armrest assembly to reach the locked state, to adapt to the use of people with different heights and body types, thereby improving the user experience.

[0006] According to some embodiments of the present utility model, a plurality of the clamping blocks are arranged at equal intervals in the vertical direction.

[0007] According to some embodiments of the present utility model, the positioning member is provided with a clamping portion, two protrusions are protruding from the clamping portion, and a clamping groove is formed between the two protrusions.

[0008] According to some embodiments of the present utility model, the armrest assembly includes a connecting member, the connecting member is fixedly connected to the first sliding member, a guiding column is protruding from the bottom of the connecting member, the positioning member is provided with a positioning groove, the guiding column can be inserted into the positioning groove, the elastic member is a first spring, one end of the first spring is sleeved on the guiding column, and the other end of the first spring is installed in the positioning groove.

[0009] According to some embodiments of the present utility model, a receiving groove is formed on the side wall of the support block, the clamping block is arranged on the bottom wall of the receiving groove, a vertical guiding groove is formed on the top of the support block, the guiding groove communicates with the receiving groove, and the positioning member is slidably connected to the guiding groove.

[0010] According to some embodiments of the present utility model, a slot is formed on the bottom wall of the first sliding groove, a positioning column is protruding from the bottom of the support block, and the positioning column can be inserted into the slot.

[0011] According to some embodiments of the present utility model, the armrest assembly includes a connecting member, a bottom plate and a panel, the connecting member is fixedly connected to the first sliding member, the bottom plate is movably connected to the connecting member, the bottom plate can slide or rotate in the horizontal direction, and the panel covers the bottom plate.

[0012] According to some embodiments of the present utility model, the armrest assembly further includes a second sliding member, the second sliding member is rotatably connected to the connecting member, a horizontal second sliding groove is formed on the bottom plate, and the second sliding member is slidably connected to the second sliding groove.

[0013] According to some embodiments of the present utility model, a plurality of first limiting grooves are formed on the opposite side walls of the second sliding groove, the plurality of first limiting grooves are arranged continuously in the horizontal direction, the armrest assembly further includes multiple groups of limiting blocks, each group of limiting blocks includes two limiting blocks, both of the two limiting blocks are slidably connected to the second sliding member, a second spring is connected between the two limiting blocks, and the second spring can drive the two limiting blocks to move away from each other, so that the two limiting blocks can be respectively clamped into the first limiting grooves on the opposite sides.

[0014] According to some embodiments of the present utility model, the armrest assembly further includes a rotating block. The second sliding member is provided with an installation groove, the rotating block is located in the installation groove, the rotating block is fixedly connected to the connecting member, the side wall of the installation groove is provided with a plurality of second limiting grooves, and the plurality of second limiting grooves are continuously arranged along the circumferential direction of the rotating block. The rotating block is provided with a limiting portion, and the limiting portion can be engaged with the second limiting groove to limit the rotation of the second sliding member.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of a seat armrest according to an embodiment of the present utility model;

[0018] Figure 2 is an exploded schematic diagram of a seat armrest according to an embodiment of the present utility model;

[0019] Figure 3 is a cross-sectional view of a seat armrest according to an embodiment of the present utility model;

[0020] Figure 4 is a schematic structural diagram of a second sliding member of a seat armrest according to an embodiment of the present utility model;

[0021] Figure 5 is a schematic structural diagram of a bottom plate of a seat armrest according to an embodiment of the present utility model;

[0022] Figure 6 is a schematic structural diagram of a positioning member of a seat armrest according to an embodiment of the present utility model;

[0023] Figure 7 is a schematic structural diagram of a support block of a seat armrest according to an embodiment of the present utility model;

[0024] Figure 8 is a schematic structural diagram of a mounting seat of a seat armrest according to an embodiment of the present utility model;

[0025] Figure 9 is a schematic structural diagram of a connecting member of a seat armrest according to an embodiment of the present utility model.

[0026] Description of the reference numerals:

[0027] Adjustment assembly 100, mounting seat 110, first sliding groove 111, slot 112, first sliding member 120, opening groove 121

[0028] Armrest assembly 200, connecting piece 210, guide post 211, connecting portion 212, bottom plate 220, second chute 221, first limiting groove 222, panel 230, second sliding member 240, mounting groove 241, second limiting groove 242, limiting block 250, second spring 260, rotating block 270, limiting portion 271

[0029] Positioning assembly 300, support block 310, clamping block 311, accommodating groove 312, guide groove 313, positioning post 314, positioning member 320, card slot 321, clamping portion 322, convex block 323, positioning slot 324, handle portion 325, elastic member 330 Detailed implementation manners

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0033] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0034] It can be understood that with reference to Figures 1 to 9, the seat armrest of the present utility model includes an adjustment assembly 100, an armrest assembly 200, and a positioning assembly 300. The adjustment assembly 100 includes a mounting base 110 and a first sliding member 120. A vertical first sliding groove 111 is provided at the upper end of the mounting base 110, and the first sliding member 120 is slidably disposed in the first sliding groove 111; the armrest assembly 200 is fixed to the upper end of the first sliding member 120; the positioning assembly 300 includes a support block 310 and a positioning member 320. The support block 310 is fixedly connected to the bottom wall of the first sliding groove 111, the first sliding member 120 is movably sleeved on the support block 310, and a plurality of locking blocks 311 are protrudingly provided on the side wall of the support block 310. The plurality of locking blocks 311 are arranged at intervals in the vertical direction. The positioning member 320 is rotatably connected to the first sliding member 120, a card slot 321 is provided in the positioning member 320, and the positioning member 320 is connected with an elastic member 330. The elastic member 330 can drive the positioning member 320 to rotate towards the direction close to the locking block 311, so that the locking block 311 can be inserted into the card slot 321.

[0035] During use, by rotating the positioning member 320 away from the locking block 311, the locking block 311 is disengaged from the card slot 321, and the elastic member 330 is compressed and deformed. At the same time, by vertically lifting the armrest assembly 200 upwards, since the armrest assembly 200 is fixed to the upper end of the first sliding member 120 and the first sliding member 120 is slidably disposed in the first sliding groove 111, the first sliding member 120 can be driven to slide upwards in the first sliding groove 111 when the armrest assembly 200 rises, so that the height position of the armrest assembly 200 can be adjusted. When adjusted to the preset height position, the elastic member 330 elastically returns to drive the positioning member 320 to rotate towards the direction close to the locking block 311, so that the locking block 311 at the corresponding height position is inserted into the card slot 321, thereby fixing the height positions of the first sliding member 120 and the armrest assembly 200 to reach the locked state, so as to adapt to the use of people with different heights and body types, thereby improving the user experience.

[0036] In addition, by the elastic force of the elastic member 330 driving the positioning member 320 to rotate towards the direction close to the locking block 311, the possibility of the locking block 311 disengaging from the card slot 321 in the locked state can be reduced, thereby improving the locking stability.

[0037] Secondly, since the first sliding member 120 is slidably disposed in the first sliding groove 111 and the first sliding member 120 is movably sleeved on the support block 310, guiding the first sliding member 120 to vertically lift and lower by the first sliding groove 111 and the support block 310 can improve the stability of the lift adjustment.

[0038] It should be noted that the clamping block 311 can be a horizontally arranged long strip, and the shape of the clamping groove 321 matches the shape of the clamping block 311. By the clamping block 311 abutting against the upper wall surface of the clamping groove 321 to support and fix the positioning member 320, the stress area between the clamping block 311 and the upper wall surface of the clamping groove 321 can be increased, thereby improving the stability of the height position of the positioning member 320, and further improving the position stability of the first sliding member 120 and the armrest assembly 200.

[0039] The elastic member 330 can be a spring or a leaf spring, etc., which can generate elastic deformation and drive the positioning member 320 to rotate in the direction close to the clamping block 311.

[0040] The armrest assembly 200 is used to support the user's arm. An opening groove 121 is provided on the upper side wall of the first sliding member 120. The positioning member 320 is provided with a handle portion 325. The handle portion 325 extends out of the first sliding member 120 through the opening groove 121. By the handle portion 325, it is convenient for the user to apply force to rotate the positioning member 320. A groove is provided on the bottom surface of the handle portion 325, which is convenient for the user's hand to extend into the groove to apply force, and can reduce the possibility of the user's hand slipping off the handle portion 325.

[0041] It can be understood that referring to Figure 3 and Figure 7 , a plurality of clamping blocks 311 are arranged at equal intervals in the vertical direction. By arranging a plurality of clamping blocks 311 at equal intervals in the vertical direction, the height position of the armrest assembly 200 can be adjusted at equal heights, so as to conveniently adjust the armrest assembly 200 to the required height position.

[0042] It can be understood that referring to Figure 3 and Figure 6 , the positioning member 320 is provided with a clamping portion 322. Two convex blocks 323 protrude from the clamping portion 322, and a clamping groove 321 is formed between the two convex blocks 323. Since two convex blocks 323 protrude from the clamping portion 322 and a clamping groove 321 is formed between the two convex blocks 323, when the clamping block 311 is inserted into the clamping groove 321, both convex blocks 323 can extend into the gap space between two adjacent clamping blocks 311. By the clamping block 311 abutting against the bottom surface of the upper convex block 323 to support and fix the positioning member 320, when the clamping block 311 or the upper convex block 323 breaks due to excessive force, by the bottom surface of the lower convex block 323 abutting against another adjacent clamping block 311 to support and fix the positioning member 320, the risk of the first sliding member 120 quickly descending due to the breakage of the clamping block 311 or the upper convex block 323 can be reduced, thereby improving the safety of use.

[0043] It can be understood that referring to Figure 3 , Figure 6 and Figure 9, the armrest assembly 200 includes a connecting member 210. The connecting member 210 is fixedly connected to the first sliding member 120. A guiding post 211 protrudes from the bottom of the connecting member 210. The positioning member 320 is provided with a positioning groove 324. The guiding post 211 can be inserted into the positioning groove 324. The elastic member 330 is a first spring. One end of the first spring is sleeved on the guiding post 211, and the other end of the first spring is installed in the positioning groove 324. Since the elastic member 330 is a first spring, one end of the first spring is sleeved on the guiding post 211, and the other end of the first spring is installed in the positioning groove 324. The deformation direction of the first spring is guided by the guiding post 211 and the positioning groove 324 to reduce the position deviation during the deformation of the first spring, and the rotation of the positioning member 320 is guided by inserting the guiding post 211 into the positioning groove 324, so as to improve the rotation stability of the positioning member 320, which is beneficial to the alignment and engagement of the locking block 311 with the clamping groove 321.

[0044] It can be understood that, referring to Figure 3 and Figure 7 , a receiving groove 312 is formed in the side wall of the support block 310. The locking block 311 is arranged on the bottom wall of the receiving groove 312. A vertical guiding groove 313 is formed in the top of the support block 310. The guiding groove 313 communicates with the receiving groove 312. The positioning member 320 is slidably connected to the guiding groove 313. By forming the receiving groove 312 in the side wall of the support block 310 and arranging the locking block 311 on the bottom wall of the receiving groove 312, the contact area between the support block 310 and the first sliding member 120 can be reduced, thereby improving the smoothness of the movement of the first sliding member 120. And because the guiding groove 313 communicates with the receiving groove 312 and the positioning member 320 is slidably connected to the guiding groove 313, the positioning member 320 can extend into the receiving groove 312 along the guiding groove 313 and swing in the receiving groove 312. By guiding the vertical lifting movement of the positioning member 320 through the guiding groove 313, the stability of the lifting movement of the positioning member 320 can be improved, thereby improving the stability of the height adjustment of the armrest assembly 200.

[0045] It can be understood that, referring to Figure 7 and Figure 8 , a slot 112 is formed in the bottom wall of the first sliding groove 111. A positioning post 314 protrudes from the bottom of the support block 310. The positioning post 314 can be inserted into the slot 112. By inserting the positioning post 314 into the slot 112, the position of the support block 310 can be pre-positioned, so as to facilitate the fixed connection of the support block 310 to the first sliding groove 111, and the position stability of the support block 310 after installation can be improved.

[0046] It can be understood that, referring to Figure 2 , Figure 3 , Figure 5 and Figure 9, the armrest assembly 200 includes a connecting member 210, a bottom plate 220 and a panel 230. The connecting member 210 is fixedly connected to the first sliding member 120. The bottom plate 220 is movably connected to the connecting member 210. The bottom plate 220 can slide or rotate in the horizontal direction. The panel 230 covers the bottom plate 220. By movably connecting the bottom plate 220 to the connecting member 210, the bottom plate 220 can slide or rotate in the horizontal direction, thereby adjusting the horizontal position and rotation angle of the panel 230 to improve the user's comfort.

[0047] It should be noted that a horizontal guiding groove can be formed at the bottom of the bottom plate 220, and a connecting portion 212 is provided at the top of the connecting member 210. The connecting portion 212 is slidably connected to the guiding groove, and the connecting portion 212 can rotate horizontally in the guiding groove. The connecting member 210 supports the bottom plate 220 by abutting against the bottom surface of the bottom plate 220.

[0048] Specifically, referring to Figure 2 , Figure 3 and Figure 5 , the armrest assembly 200 further includes a second sliding member 240. The second sliding member 240 is rotatably connected to the connecting member 210. The bottom plate 220 is provided with a horizontal second sliding groove 221. The second sliding member 240 is slidably connected to the second sliding groove 221. By slidably connecting the second sliding member 240 to the second sliding groove 221, when the bottom plate 220 slides horizontally, the second sliding member 240 slides in the second sliding groove 221, which can guide the horizontal movement of the bottom plate 220 to reduce the shaking and deviation when the bottom plate 220 moves, thereby improving the stability of the movement adjustment of the panel 230. Moreover, since the second sliding member 240 is rotatably connected to the connecting member 210, when the bottom plate 220 rotates horizontally, the second sliding member 240 can be driven to rotate.

[0049] Specifically, referring to Figure 4 and Figure 5, on opposite side walls of the second sliding groove 221, a plurality of first limiting grooves 222 are formed. The plurality of first limiting grooves 222 are arranged continuously in the horizontal direction. The armrest assembly 200 further includes multiple groups of limiting blocks 250. Each group of limiting blocks 250 includes two limiting blocks 250. The two limiting blocks 250 are both slidably connected to the second sliding member 240. A second spring 260 is connected between the two limiting blocks 250. The second spring 260 can drive the two limiting blocks 250 to move away from each other, so that the two limiting blocks 250 can respectively be inserted into the first limiting grooves 222 on the opposite sides. When the bottom plate 220 slides horizontally to adjust the position of the panel 230, the limiting blocks 250 can abut against the side wall of the second sliding groove 221 and slide along the side wall of the second sliding groove 221 under the drive of the second spring 260 until the panel 230 is adjusted to a preset position. The second spring 260 drives the two limiting blocks 250 to move away from each other, so that the two limiting blocks 250 can respectively be inserted into the first limiting grooves 222 on the opposite sides, thereby being able to position the sliding position of the bottom plate 220, and further positioning the position of the panel 230. In addition, since a plurality of first limiting grooves 222 are formed on opposite side walls of the second sliding groove 221 and the plurality of first limiting grooves 222 are arranged continuously in the horizontal direction, it is convenient for the limiting blocks 250 to be inserted into the first limiting grooves 222 at corresponding positions to position the sliding position of the bottom plate 220.

[0050] Specifically, referring to Figure 2 , Figure 3 and Figure 5 , the armrest assembly 200 further includes a rotating block 270. The second sliding member 240 is provided with an installation groove 241. The rotating block 270 is located in the installation groove 241. The rotating block 270 is fixedly connected to the connecting member 210. A plurality of second limiting grooves 242 are formed on the side wall of the installation groove 241. The plurality of second limiting grooves 242 are arranged continuously along the circumferential direction of the rotating block 270. The rotating block 270 is provided with a limiting portion 271. The limiting portion 271 can be inserted into the second limiting groove 242 to limit the rotation of the second sliding member 240. By horizontally rotating the bottom plate 220 and driving the second sliding member 240 to rotate, since the rotating block 270 is fixedly connected to the connecting member 210, the limiting portion 271 abuts against the side wall of the installation groove 241 and relatively slides along the side wall of the installation groove 241. When the bottom plate 220 is rotated and adjusted to a preset angle, the limiting portion 271 is inserted into the second limiting groove 242 to limit the rotation of the second sliding member 240, thereby being able to position the rotation angle of the panel 230.

[0051] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A seat armrest, characterized in that: include: The adjustment assembly comprises a mounting seat and a first sliding member, wherein a vertical first sliding groove is formed at an upper end of the mounting seat, and the first sliding member is slidably disposed in the first sliding groove; An armrest assembly, fixed to the upper end of the first sliding member; The positioning assembly includes a support block and a positioning member, the support block is fixedly connected to the bottom wall of the first slide groove, the first sliding member is movably mounted on the support block, the side wall of the support block is protruding with a plurality of blocks, and the plurality of blocks are arranged at intervals in the vertical direction, the positioning member is rotatably connected to the first sliding member, the positioning member is provided with a slot, and the positioning member is connected to an elastic member, and the elastic member can drive the positioning member to rotate in a direction close to the block so that the block can be inserted into the slot.

2. The chair armrest according to claim 1, characterized in that: The plurality of card blocks are arranged at equal intervals along the vertical direction.

3. The chair armrest according to claim 1, characterized in that: The positioning member is provided with a clamping portion, and the clamping portion is protrudingly provided with two protrusions, and the clamping groove is formed between the two protrusions.

4. The chair armrest according to claim 1, characterized in that: The armrest assembly includes a connecting piece, which is fixedly connected to the first sliding piece. A guide column is protruding from the bottom of the connecting piece. The positioning piece is provided with a positioning groove, and the guide column can be inserted into the positioning groove. The elastic piece is a first spring, one end of the first spring is sleeved on the guide column, and the other end of the first spring is installed in the positioning groove.

5. The chair armrest according to claim 1, characterized in that: The side wall of the support block is provided with a receiving groove, the clamping block is arranged on the bottom wall of the receiving groove, the top of the support block is provided with a vertical guide groove, the guide groove is connected to the receiving groove, and the positioning member is slidably connected to the guide groove.

6. The chair armrest according to claim 1, characterized in that: A slot is formed on the bottom wall of the first sliding groove, and a positioning column is protruding from the bottom of the support block, and the positioning column can be inserted into the slot.

7. The chair armrest according to claim 1, characterized in that: The armrest assembly includes a connecting member, a base plate and a panel, the connecting member is fixedly connected to the first sliding member, the base plate is movably connected to the connecting member, the base plate can slide or rotate in a horizontal direction, and the panel cover is arranged on the base plate.

8. The chair armrest according to claim 7, characterized in that: The armrest assembly further comprises a second sliding member, which is rotatably connected to the connecting member. The bottom plate is provided with a horizontal second sliding groove, and the second sliding member is slidably connected to the second sliding groove.

9. The chair armrest according to claim 8, characterized in that: The opposite side walls of the second slide groove are provided with a plurality of first limit grooves, and the plurality of first limit grooves are continuously arranged in the horizontal direction. The armrest assembly also includes a plurality of groups of limit blocks, each group of the limit blocks includes two limit blocks, and the two limit blocks are both slidably connected to the second sliding member. A second spring is connected between the two limit blocks, and the second spring can drive the two limit blocks to move away from each other so that the two limit blocks can be respectively inserted into the first limit grooves on the opposite sides.

10. The chair armrest according to claim 9, characterized in that: The armrest assembly also includes a rotating block, the second sliding member is provided with an installation groove, the rotating block is located in the installation groove, the rotating block is fixedly connected to the connecting member, the side wall of the installation groove is provided with a plurality of second limiting grooves, the plurality of second limiting grooves are continuously arranged along the circumference of the rotating block, the rotating block is provided with a limiting portion, and the limiting portion can be inserted into the second limiting groove to limit the rotation of the second sliding member.

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