Allocator

Abstract

The present invention discloses a dispenser, comprising a main body, a first cover, a switch portion, and a rotating member. The main body has a first cavity recessed vertically downward, the first cover can open or close the first cavity, the switch portion has a first end portion located below the upper surface of the first cover and a protrusion extending vertically downward from the first end portion, the protrusion having a first portion facing downward; the rotating member includes a connecting portion located above the rotating member, the connecting portion including a curved surface portion, the switch portion being movable between a first position and a second position. When the switch portion is in the first position, the first portion engages with the curved surface portion of the connecting portion, and the first cover closes the first cavity; when the switch portion is in the second position, the first portion disengages from the curved surface portion of the connecting portion. The dispenser of the present invention facilitates the first cover to open the first cavity.

Description

Technical Field

[0001] The invention relates to a dispenser and belongs to the field of household appliances. Background Art

[0002] Dispensers are increasingly being used in washing appliances, which dispense detergent to a washing area within a specified time in order to complete a subsequent washing process.

[0003] A cover-type dispenser is a widely used dispenser. In the related art, a first cover of the cover-type dispenser slides relative to a main body to open and close the first chamber. However, the opening method of the first cover of the existing cover-type dispenser needs to be improved. Summary of the Invention

[0004] To this end, the present invention provides a dispenser, wherein the first cover of the dispenser facilitates opening of the first cavity.

[0005] The invention further comprises a body having a first cavity recessed downward in a vertical direction, the first cavity being used to store a first detergent; a first cover body mounted on the body and located above the first cavity in a vertical direction, the first cover body being movable on the body in a front-to-rear direction to open or close the first cavity, the front-to-rear direction being perpendicular to the vertical direction; a switch portion, the switch portion being at least partially exposed on the upper surface of the first cover body, the switch portion having a first end portion located below the upper surface of the first cover body and a protrusion extending vertically downward from the first end portion, the protrusion being provided with a first portion facing downward; a rotating member, the rotating member comprising a connecting portion located above the rotating member, the connecting portion comprising an arcuate portion facing the first cover body, the arcuate portion of the connecting portion being adapted to cooperate with the first portion; the switch portion being movable between a first position and a second position, wherein when the switch portion is in the first position, the first portion of the protrusion cooperates with the arcuate portion of the connecting portion, and the first cover body closes the first cavity; and when the switch portion is in the second position, the first portion of the protrusion is disengaged from the arcuate portion of the connecting portion.

[0006] According to the dispenser of an embodiment of the present invention, when the switch portion is in the first position, the first portion of the protrusion engages with the curved surface portion of the connecting portion, and the first cover closes the first chamber. When the switch portion is in the second position, the first portion of the protrusion disengages from the curved surface portion of the connecting portion. The engagement of the first portion of the protrusion with the curved surface portion of the connecting portion reduces friction, thereby facilitating manual opening of the first chamber by the first cover.

[0007] In some embodiments, in the front-to-back direction, a cross-sectional area of ​​the first portion of the protrusion is smaller than a cross-sectional area of ​​the first end portion.

[0008] In some embodiments, the protrusion further includes a curved surface portion connected to the first portion, and in the front-to-back direction, the sum of the cross-sectional area of ​​the curved surface portion and the cross-sectional area of ​​the first portion is smaller than the cross-sectional area of ​​the first end portion.

[0009] In some embodiments, the arc surface portion of the protrusion is integrally formed with the first portion.

[0010] In some embodiments, the first portion is a planar portion or a curved portion.

[0011] In some embodiments, a pressing portion is provided at the other end of the switch portion, the pressing portion is movable in a vertical direction, the pressing portion is used to control the switch portion to move from a first position to a second position, and the pressing portion is integrally formed with the first end portion.

[0012] In some embodiments, the first cover body carries a gasket made of elastic material, and the gasket is suitable for sealing and closing the first cavity when the first cover body closes the first cavity. The first cover body is provided with a first wall surrounding the gasket, and a protrusion is provided on the outer side of the first wall. The protrusion is located on the side of the first wall facing the switch part, and the protrusion is used to prevent the switch part from colliding with the first wall when moving.

[0013] In some embodiments, the protrusion is arc-shaped in a direction facing the switch portion, and the protrusion is integrally formed with the first wall.

[0014] In some embodiments, a connecting rod is provided between the two ends of the switch portion, and in the front-to-back direction, the length of the connecting rod is greater than the length of the first end portion.

[0015] In some embodiments, the rotating member also includes a rotating arm and a rotating shaft, the rotating arm is connected to the connecting part, the rotating arm is connected to the rotating shaft, the rotating arm is located between the rotating shaft and the connecting part, the rotating arm is cylindrical, and the rotating arm and the arc-shaped part of the connecting part are integrally formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a schematic diagram of the overall structure of a dispenser according to an embodiment of the present invention.

[0017] Figure 2 is an exploded view of a dispenser according to an embodiment of the present invention.

[0018] Figure 3 FIG. 4 is a cross-sectional view of a switch portion of a dispenser according to an embodiment of the present invention in a second position.

[0019] Figure 4FIG. 4 is a cross-sectional view of a switch portion of a dispenser according to an embodiment of the present invention in a first position.

[0020] Figure 5 According to the present invention Figure 3 An enlarged view of point A is shown.

[0021] Figure 6 According to the present invention Figure 4 An enlarged view of point B is shown.

[0022] Figure 7 is a perspective view of a first cover of a dispenser according to an embodiment of the present invention.

[0023] Figure 8 is a schematic cross-sectional view of a first cover of a dispenser according to an embodiment of the present invention.

[0024] Figure 9 3D is a perspective view of the first cover of the dispenser according to an embodiment of the present invention from another angle.

[0025] Figure 10 It is a three-dimensional view of a dispenser without a first cover according to an embodiment of the present invention.

[0026] Figure 11 is a perspective view of a rotating member according to an embodiment of the present invention.

[0027] Figure 12 is a three-dimensional cross-sectional schematic diagram from another perspective according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Main body 1, first cavity 101, edge 11, first cover 2, switch portion 21, first end portion 211, protrusion 212, first part 2121, second part 2122, pressing portion 213, connecting rod 214, gasket 22, first wall 23, protrusion 24, elastic device 25, rotating part 3, connecting part 31, arc surface part 311, rotating shaft 32, rotating arm 33, connecting part 34, cylinder 341, extension part 342, control valve 4, cover opening elastic part 5. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 therefore should not be construed as limiting the present invention.

[0031] like Figure 1-12 As shown, the dispenser according to an embodiment of the present invention includes a body 1, a first cover 2, a switch portion 21 and a rotating member 3. The body 1 has a first cavity 101 that is recessed in the vertical direction. The first cavity 101 is used to store a first detergent, wherein the first detergent can be an ordinary detergent (such as washing powder) used by a dishwasher when washing dishes.

[0032] The first cover 2 is mounted on the body 1 and is slidable on the body in a front-to-rear direction. The first cover 2 is movable between an open position for opening the first cavity 101 and a closed position for closing the first cavity 101. The first cover 2 is slidable relative to the body 1, or the first cover 2 is flippable relative to the body 1. In this embodiment, the first cover 2 is slidable relative to the body 1.

[0033] Specifically, the first cover 2 is positioned within the body 1 and includes a switch portion 21. The switch portion 21 is configured to cooperate with the rotating member 3 to enable the first cover 2 to move between an open position and a closed position within the first cavity 101. The first cover 2 moves on the body 1, with the switch portion 21 at least partially exposed on the upper surface of the first cover 2. The switch portion 21 is movable between a first position and a second position. The switch portion 21 is movable vertically from the first position to the second position. The switch portion 21 is located near the left end face of the first cover 2. The first end of the first cover 2 cooperates with the body 1 to enable the first cover 2 to open and close the first cavity 101. The front-to-back direction is perpendicular to the vertical direction. When the first cover 2 moves forward away from the first cavity 101, the first cavity 101 is opened. When the first cover 2 moves backward, the first cavity 101 is closed. In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as “first” or “second” may explicitly or implicitly include at least one of the features.

[0034] Specifically, the switch portion 21 is provided with a first end portion 211 (eg Figure 2 The right end shown in the figure) has a first end portion 211, and a protrusion 212 is provided on the first end portion 211 along the direction in which the first cavity 101 is recessed. The rotating member 3 includes a connecting portion 31, which is located at the end of the rotating member 3 close to the first cover 2. The connecting portion 31 includes a curved portion 311 facing the first cover 2. The protrusion 212 includes a first portion 2121 facing the connecting portion 31 and a second portion 2122 connected to the first portion 2121. The curved portion 311 of the connecting portion 31 can be used to cooperate with the first portion 2121 of the protrusion 212. The switch portion 21 can move from a first position to a second position in the front-to-back direction. When the switch portion 21 is in the first position, the first portion 2121 of the protrusion 212 cooperates with the curved portion 311 of the connecting portion 31, and the first cover 2 closes the first cavity 101. When the switch portion 21 is in the second position, the first portion 2121 of the protrusion 212 is disengaged from the curved portion 311 of the connecting portion 31. The first portion 2121 of the protruding portion 212 cooperates with the arc portion 311 of the connecting portion 31 to reduce friction during contact, thereby facilitating manual opening of the first cavity 101 by the first cover 2 .

[0035] During the movement of the switch portion 21 from the first position to the second position, the first cover body 2 starts to prepare for action from the closed position fixed to the first cavity 101. After the switch portion 21 moves from the first position to the second position, the first cover body 2 moves from the closed position of the first cavity 101 to the open position, so that the first cover body 2 opens the first cavity 101. At the same time as the first cover body 2 opens the first cavity 101, the switch portion 21 moves from the second position to the first position.

[0036] In some embodiments, in the front-to-back direction, the cross-sectional area of ​​the first portion 2121 is smaller than the cross-sectional area of ​​the first end portion 211. On the one hand, when the switch portion 21 opens the first cover body 2, the switch portion 21 as a whole is in a relatively balanced position, which facilitates the first cover body 2 to open the first cavity 101. On the other hand, the small cross-sectional area of ​​the first portion 2121 can reduce friction and facilitate the first cover body 2 to open the first cavity.

[0037] The second part 2122 and the first part 2121 of the protrusion 212 are arranged in the front-to-back direction. The sum of the cross-sectional area of ​​the second part 2122 and the cross-sectional area of ​​the first part 2121 is smaller than the cross-sectional area of ​​the first end 211. The contact area between the protrusion 212 and the arc surface part 311 of the connecting part 31 is small, which can reduce friction and facilitate processing.

[0038] The first portion 2121 is a flat portion or a curved portion. When the first portion 2121 is flat, the first portion 2121 of the protrusion 212 cooperates with the curved portion 311 of the connection portion 31. In this case, the curved surface cooperates with the flat surface, which is equivalent to a line-surface cooperation. This can reduce friction during contact, thereby facilitating manual opening of the first cavity 101 by the first cover 2. When the first portion 2121 is curved, the first portion 2121 of the protrusion 212 cooperates with the curved portion 311 of the connection portion 31. In this case, the curved surface cooperates with the flat surface, which is equivalent to a line-surface cooperation. This can further reduce friction during contact, thereby facilitating manual opening of the first cavity 101 by the first cover 2. In actual application, process aspects need to be considered.

[0039] According to the dispenser of the embodiment of the present invention, the other end of the switch portion 21 is provided with a pressing portion 213, which can move along the direction of the depression of the first cavity 101. The pressing portion 213 is used to control the switch portion 21 to move from the first position to the second position. When the first cover 2 needs to be manually opened, when an external force acts on the pressing portion 213, according to the principle of leverage, the first end portion 211 moves upward, so that the first part 2121 of the protrusion 212 of the first end portion 211 is separated from the arc portion 311 of the connecting portion 31, and then the first cover 2 opens the first cavity 101. In other words, the external force can act on the pressing portion 213 of the switch portion 21 to drive the protrusion 212 of the first end portion 211 of the switch portion 21 to move, that is, the external force can act on the switch portion 21 from the outside of the dispenser. The pressing portion 213 and the first end portion 211 are connected together by a connecting rod 214. In other embodiments, the pressing portion 213, the first end portion 211, and the connecting rod 214 are integrally formed by an injection molding process, thereby facilitating processing.

[0040] Specifically, in the transverse direction of the first cover 2, the length of the connecting rod 214 is greater than the length of the first end 211. The connecting rod 214 is relatively long, which facilitates the movement of the switch 21. The transverse direction is perpendicular to the front-rear direction.

[0041] In some embodiments, the first cover 2 has a bearing gasket 22 on its inner side (the side facing the body 1). The gasket 22 is made of a soft elastic material and is shaped so that when the first cover 2 enters the closed position, it can be pressed against the peripheral opening edge 11 of the first cavity 101 to seal the first cavity 101. The outside of the first cavity 101 is provided with a first wall 23 surrounding the gasket 22. The outside of the first wall 23 is provided with a protrusion 24. Specifically, the protrusion 24 is located on the side of the first wall 23 facing the switch portion 21. The protrusion 24 is used to prevent the switch portion 21 from colliding with the first wall 23 when it moves. Specifically, the protrusion 24 can prevent the connecting rod 214 of the switch portion 21 from colliding with the first wall 23 when the switch portion 21 moves.

[0042] In some embodiments, the protrusion 24 is arc-shaped in the direction facing the switch portion 21. In other words, the protrusion 24 has a U-shaped cross-section along the front-to-back direction of the dispenser. When an external force acts on the switch portion 21, causing it to move, the protrusion 24 effectively blocks the connecting rod 214 from colliding with the first wall 23, thereby preventing the connecting rod 214 from deviating from its pre-designed path. The protrusion 24 and the first wall 23 can be integrally formed or assembled and fixedly connected. In this embodiment, the protrusion 24 and the first wall 23 are integrally formed.

[0043] An elastic device 25 is disposed between the first end 211 of the switch portion 21 and the first cover 2. This device is used to reset and compress the switch portion 21 when it moves between the first and second positions. When the switch portion 21 moves from the first position to the second position, the first portion 2121 of the protrusion 212 of the first end 211 and the curved surface portion 311 of the connecting portion 31 move from a mating state to a disengaged state, compressing the elastic device 25. Subsequently, the switch portion 21 moves from the second position to the first position, causing the elastic device 25 to reset and the first cover 2 to move toward opening the first cavity 101. In this embodiment, the elastic device 25 is a spring.

[0044] According to the dispenser of the embodiment of the present invention, the rotating member 3 further includes a rotating shaft 32, a rotating arm 33 and a connecting member 34, one end of the rotating arm 33 is connected to the connecting portion 31, and the other end of the rotating arm 33 is connected to the rotating shaft 32, the rotating arm 33 is located between the rotating shaft 32 and the connecting portion 31, and the connecting member 34 includes a cylinder 341 and an extension portion 342 extending outward from the outer circumference of the cylinder 341, and the cylinder 341 is arranged around the second end of the rotating shaft 32 (such as Figure 11 The rear end of the body 1 is shown. Specifically, the rotating arm 33 is cylindrical and integrally formed with the arc-shaped portion 311 of the connecting portion 31. The rear end of the body 1 is also connected to a control valve 4, which electrically controls the first cover 2 to open the first chamber 101. The control valve 4 is connected to the extension 342 to drive the body 1 to rotate via the extension 342, and the cylinder 341 can drive the rotation shaft 32 to rotate. When the control valve 4 is energized, it can drive the end of the extension 342 away from the cylinder 341 to move, thereby driving the rotation of the cylinder 341. The rotation of the cylinder 341 can drive the rotation shaft 32.

[0045] Specifically, the rotating shaft 32 is rotatably connected to the main body 1 to drive the first portion 2121 of the protruding portion 212 to disengage and engage with the arc surface portion 311 of the connecting portion 31 . It can be understood that when the first cover body 2 is in the first position, the first part 2121 of the protrusion 212 cooperates with the arcuate part 311 of the connecting part 31 to lock the first cover body 2 in the closed position. When unlocking is required, the first cover body 2 can be unlocked manually or automatically. When manually unlocking, an external force acts on the pressing part 213 of the switch part 21, and the first part 2121 of the protrusion 212 disengages from the arcuate part 311 of the connecting part 31 to allow the first cover body 2 to slide from the closed position to the open position; when automatically unlocking the first cover body 2, the control valve 4 controls the rotation shaft 32 installed on the main body 1 to rotate, and the rotating arm 33 and the connecting part 31 move to drive the first part 2121 of the protrusion 212 to disengage from the arcuate part 311 of the connecting part 31, thereby allowing the first cover body 2 to slide from the closed position to the open position.

[0046] In some specific embodiments, the extension portion 342 of the connecting member 34 extends from the rotating arm 33 in a direction away from the rotating shaft 32. The first end of the rotating shaft 32 is connected to the rotating arm 33. The rotating shaft 32 is rotatably mounted on the body 1. The rotating arm 33 can push the protruding portion 212 of the switch portion 21 to move under the drive of the rotating shaft 32, so that the protruding portion 212 of the switch portion 21 is separated from the connecting portion 31. It can be understood that the extension portion 342 and the cylinder 341 can be two components fixedly connected, or can be an integrally formed part.

[0047] In some embodiments, the dispenser further comprises a lid-opening elastic member 5, which is disposed between the main body 1 and the first cover 2 and is configured to push the first cover 2 toward the open position. It is understood that when the first cover 2 is slidable relative to the main body 1, after the first portion 2121 of the protrusion 212 of the switch portion 21 disengages from the curved portion 311 of the connecting portion 31, the first cover 2 slides from the closed position, which closes the first cavity 101, to the open position, which opens the first cavity 101, under the action of the lid-opening elastic member 5. Specifically, the lid-opening elastic member 5 is a torsion spring, the first end of which is connected to the main body 1, and the second end of which is connected to the first cover 2. Thus, after the first portion 2121 of the protrusion 212 of the switch portion 21 disengages from the curved portion 311 of the connecting portion 31, the first cover 2 slides from the closed position, which closes the first cavity 101, to the open position, which opens the first cavity 101, through the torsion spring.

[0048] A dishwasher comprises a dishwasher dispenser structure, which is convenient for users to use the dishwasher. The dishwasher dispenser can dispense detergent when the dishwasher is working.

[0049] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0050] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dispenser, characterized in that: include: A body (1), the body (1) having a first cavity (101) recessed downward in a vertical direction, the first cavity (101) being used to store a first detergent; a first cover (2), the first cover (2) being mounted on the body (1) and being located above the first cavity (101) in a vertical direction, the first cover (2) being movable on the body (1) in a front-to-back direction to open or close the first cavity (101), the front-to-back direction being perpendicular to the vertical direction; a switch portion (21), the switch portion (21) being at least partially exposed on the upper surface of the first cover body (2), the switch portion (21) comprising a first end portion (211) located below the upper surface of the first cover body (2) and a protruding portion (212) extending vertically downward from the first end portion (211); A rotating member (3), the rotating member (3) comprising a connecting portion (31) located above the rotating member (3), the connecting portion (31) comprising an arcuate portion (311) facing the first cover body (2), the protruding portion (212) being provided with a first portion (2121) facing the connecting portion (31), the arcuate portion (311) of the connecting portion (31) being adapted to cooperate with the first portion (2121); in The switch portion (21) can move between a first position and a second position. When the switch portion (21) is in the first position, the first portion (2121) of the protruding portion (212) cooperates with the arcuate portion (311) of the connecting portion (31), and the first cover (2) closes the first cavity (101). When the switch portion (21) is located at the second position, the first portion (2121) of the protruding portion (212) is separated from the arc surface portion (311) of the connecting portion (31); The dispenser further comprises a cover-opening elastic member (5), wherein the cover-opening elastic member (5) is arranged between the body (1) and the first cover (2) and is used to push the first cover (2) toward an open position; The first cover body (2) has a protrusion (24); along the moving direction of the first cover body (2), the first cover body (2) has a first side and a second side; the switch portion (21) is closer to the first side than the second side; A connecting rod (214) is provided between the two ends of the switch portion (21); along the moving direction of the first cover body (2), the protrusion (24) is farther away from the first side than the connecting rod (214); the protrusion (24) is used to block the connecting rod (214).

2. The dispenser according to claim 1, characterized in that In the front-to-back direction, the cross-sectional area of ​​the first portion (2121) is smaller than the cross-sectional area of ​​the first end portion (211).

3. The dispenser according to claim 2, characterized in that The protrusion (212) further includes a second portion (2122), the second portion (2122) being connected to the first portion (2121), the second portion (2122) and the first portion (2121) being arranged in a front-to-back direction, and the sum of the cross-sectional area of ​​the second portion (2122) and the cross-sectional area of ​​the first portion (2121) being smaller than the cross-sectional area of ​​the first end portion (211).

4. The dispenser according to claim 3, characterized in that The second portion (2122) of the protruding portion (212) is integrally formed with the first portion (2121), and the second portion (2122) is in the shape of an arc surface.

5. The dispenser according to claim 1, characterized in that The first portion (2121) is planar or arc-shaped.

6. The dispenser according to claim 3, characterized in that The other end of the switch portion (21) is provided with a pressing portion (213), the pressing portion (213) being movable in a vertical direction, the pressing portion (213) being used to control the switch portion (21) to move from a first position to a second position, and the pressing portion (213) and the first end portion (211) being integrally formed.

7. The dispenser according to claim 1, characterized in that The first cover (2) carries a gasket (22) made of an elastic material, and the gasket (22) is suitable for sealing and closing the first cavity (101) when the first cover (2) closes the first cavity (101). The first cover (2) is provided with a first wall (23) surrounding the gasket (22), and a protrusion (24) is provided on the outer side of the first wall (23), and the protrusion (24) is located on the side of the first wall (23) facing the switch portion (21).

8. The dispenser according to claim 6, characterized in that The protrusion (24) is arc-shaped in the direction facing the switch portion (21), and the protrusion (24) and the first wall (23) are integrally formed.

9. The dispenser according to claim 1, characterized in that In a transverse direction, the length of the connecting rod (214) is greater than the length of the first end portion (211), and the transverse direction is perpendicular to the front-to-back direction and the vertical direction.

10. The dispenser according to claim 1, characterized in that The rotating member (3) further comprises a rotating arm (33) and a rotating shaft (32); the rotating arm (33) is connected to the connecting portion (31); the rotating arm (33) is connected to the rotating shaft (32); the rotating arm (33) is located between the rotating shaft (32) and the connecting portion (31); the rotating arm (33) is cylindrical; the rotating arm (33) and the arc surface portion (311) of the connecting portion (31) are integrally formed.

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