CN113114827A

CN113114827A - Electronic device

Info

Publication number: CN113114827A
Application number: CN202110560137.2A
Authority: CN
Inventors: 李钧
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-07-13
Anticipated expiration: 2041-05-21
Also published as: CN113114827B

Abstract

The application discloses electronic equipment, which comprises an equipment shell, a flexible screen and a supporting plate, wherein the equipment shell comprises a first shell part and a second shell part, the first shell part and the second shell part are movably matched, and the flexible screen is arranged on the first shell part and the second shell part; the first shell part is provided with a supporting inclined plane, and the supporting plate is matched with the supporting inclined plane; the supporting plate can move along the supporting inclined surface in a direction of approaching the flexible screen in the process of separating the first shell part from the second shell part so as to support the flexible screen; the support plate can move along the support inclined plane in a direction away from the flexible screen in a process that the first shell part and the second shell part are close to each other so as to be separated from the flexible screen. Adopt the electronic equipment of this application, solve flexible screen below and do not have the support, cause the problem of flexible screen damage easily.

Description

Electronic device

Technical Field

The application relates to the technical field of communication equipment, in particular to electronic equipment.

Background

Along with the promotion of user's demand, the electronic equipment of great display screen receives user's favor more and more, but the electronic equipment of great display screen carries inconveniently, for the demand of realizing electronic equipment's big display screen and portability, the electronic equipment of flexible screen has appeared, and this kind of electronic equipment can switch between expansion state and shrink state, can have great display screen when electronic equipment is in the expansion state. However, when the screen is in the unfolded state, the flexible screen is not supported below the screen, and the flexible screen is easily damaged.

Disclosure of Invention

The application discloses electronic equipment to solve flexible screen below and do not have the support, cause the problem that flexible screen damaged easily.

In order to solve the above problems, the following technical solutions are adopted in the present application:

an electronic device comprises a device shell, a flexible screen and a supporting plate, wherein the device shell comprises a first shell part and a second shell part, the first shell part and the second shell part are movably matched, and the flexible screen is arranged on the first shell part and the second shell part;

the first shell part is provided with a supporting inclined plane, and the supporting plate is matched with the supporting inclined plane;

the supporting plate can move along the supporting inclined surface in a direction of approaching the flexible screen in the process of separating the first shell part from the second shell part so as to support the flexible screen;

the support plate can move along the support inclined plane in a direction away from the flexible screen in a process that the first shell part and the second shell part are close to each other so as to be separated from the flexible screen.

The technical scheme adopted by the application can achieve the following beneficial effects:

the electronic equipment is provided with the supporting plate, the supporting plate is movable, the supporting plate moves towards the direction close to the flexible screen in the process of keeping the first shell part away from the second shell part, when the first shell part and the second shell part are kept away from the second shell part to the unfolded state, the supporting plate moves to the position in contact with the flexible screen, the supporting plate plays a supporting role on the flexible screen at the moment, the flexible screen is prevented from sinking, the flexible screen is prevented from being pulled and damaged when the flexible screen is operated, the supporting plate moves towards the direction away from the flexible screen in the process of keeping the first shell part close to the second shell part, when the first shell part and the second shell part are close to the retracted state, the supporting plate moves to the position separated from the flexible screen, and the storage of the flexible screen is not influenced; in the process that the first shell part and the second shell part are far away from or close to each other, the support inclined surface can drive the support plate to move, and the support plate does not need to be driven by an additional driving mechanism to move, so that energy consumption can be saved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a diagram illustrating a contracted state of an electronic device according to the present application;

FIG. 2 is a diagram illustrating an expanded state of the electronic device according to the present application;

FIG. 3 is a schematic structural view of the electronic device of the present application with the flexible screen and the support plate removed;

FIG. 4 is a schematic view of the first housing portion of the present application;

FIG. 5 is an enlarged view of a portion of FIG. 3;

FIG. 6 is an enlarged partial view of another angle in FIG. 3;

fig. 7 is a partially enlarged schematic view of a cross section of an electronic device in the present application.

Description of reference numerals:

100-equipment shell, 110-first shell, 120-second shell, 130-track, 131-supporting inclined plane, 140, nesting frame, 141-first limiting part, 1411-first limiting hole, 142-second limiting part, 1421-lug, 1422-second limiting hole, 130-track, and the like,

200-flexible screen,

300-a supporting plate,

400-an elastic part,

500-push rod, 510-connecting seat, 511-connecting part, 512-supporting part, 5121-connecting hole,

600-roller, 610-pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 1-7, the present application provides an electronic device including a device housing 100, a flexible screen 200, and a support plate 300.

The device housing 100 is a basic member of the electronic device, the device housing 100 can provide a mounting base for other constituent members of the electronic device, the device housing 100 includes a first housing portion 110 and a second housing portion 120, and the first housing portion 110 and the second housing portion 120 are movably engaged. The first housing portion 110 and the second housing portion 120 may be far apart or close to each other to switch the electronic device between the extended state and the retracted state. Specifically, the first housing portion 110 and the second housing portion 120 may be separated from each other to an expanded state of the electronic device, and the electronic device may have a larger display area, and the first housing portion 110 and the second housing portion 120 may be close to each other to a contracted state of the electronic device, and the electronic device has a smaller display area, so that the electronic device is convenient to operate and carry.

The flexible screen 200 is disposed on the first housing portion 110 and the second housing portion 120, and specifically, a first end of the flexible screen 200 is connected to the first housing portion 110, a second end of the flexible screen 200 is connected to the second housing portion 120, the first end of the flexible screen 200 is movable along with the movement of the first housing portion 110, and the second end of the flexible screen 200 is movable along with the movement of the second housing portion 120, so that when the first housing portion 110 moves relative to the second housing portion 120, the first end of the flexible screen 200 also moves relative to the second end of the flexible screen 200, thereby changing a distance between the first end and the second end of the flexible screen 200, and also changing a display area of the flexible screen 200.

The first end of the flexible screen 200 may be received in the first housing portion 110 or extend from the first housing portion 110, and/or the second end of the flexible screen 200 may be received in the second housing portion 120 or extend from the second housing portion 120, and the receiving and extending manners are various, which is not limited in this application.

The flexible screen 200 is switchable with movement of at least one of the first housing portion 110 and the second housing portion 120 between an expanded state in which the flexible screen 200 has a large display area and a collapsed state in which the flexible screen 200 has a small display area.

The supporting plate 300 is a supporting structure of the flexible screen 200 and is located on the side of the flexible screen 200 opposite to the display surface, when the flexible screen is in the unfolded state, the supporting plate 300 can contact with the flexible screen 200 to support the flexible screen 200, and due to the support of the supporting plate 300, when the flexible screen 200 is in the unfolded state, the flexible screen 200 cannot sink. Meanwhile, due to the support of the support plate 300, when the flexible screen 200 is operated in an unfolded state, the flexible screen 200 is not pulled and damaged, so that the service life of the flexible screen 200 can be prolonged.

The first housing part 110 is provided with a supporting inclined plane 131, and the supporting plate 300 is matched with the supporting inclined plane 131; the support slope 131 serves to drive the movement of the support plate.

During the process of moving the first housing part 110 away from the second housing part 120, the support plate 300 may move along the support slope 131 facing to the direction close to the flexible screen 200 to support the flexible screen 200; keep away from to the state of expanding mutually at first casing part 110 and second casing part 120, backup pad 300 moves to the position that contacts with flexible screen 200, and backup pad 300 plays the effect of support to flexible screen 200 this moment, avoids flexible screen 200 to sink down, causes to drag and then causes the damage to flexible screen 200 when avoiding operating flexible screen 200.

During the approaching of the first housing part 110 and the second housing part 120, the support plate 300 may move along the support slope 131 facing away from the flexible screen 200 to be separated from the flexible screen 200. When the first housing part 110 and the second housing part 120 approach each other to the contracted state, the support plate 300 moves to a position separated from the flexible screen 200, and the accommodation of the flexible screen 200 is not affected.

The support plate 300 is movably disposed in the device housing 100, and in the unfolded state, the support plate 300 can move to a position contacting the flexible screen 200, and the support plate 300, the first housing part 110 and the second housing part 120 form a first screen support surface. In the contracted state, the support plate 300 may be moved to a position separated from the flexible screen 200, at which time the first housing part 110 and the second housing part 120 form a second screen support surface.

No matter under the expansion state, still under the shrink state, flexible screen 200 all has the structure to form the screen holding surface and supports, can avoid flexible screen 200 to cause flexible screen 200 to sink owing to there is not the support, causes to drag and then causes the damage to flexible screen 200 when avoiding operating flexible screen 200.

In this embodiment, in a direction in which the first housing portion 110 is far from the second housing portion 120, a distance between the supporting inclined surface 131 and the flexible screen 200 is gradually increased, that is, for the supporting inclined surface 131 on the first housing portion 110, a distance between one end of the first housing portion 110 close to the second housing portion 120 and the flexible screen 200 is smaller, a distance between one end of the first housing portion 120 far from the flexible screen 200 is larger, a distance between the supporting inclined surface 131 on the first housing portion 110 and one end of the second housing portion 120 far from the flexible screen 200 is gradually increased, so that when the first housing portion 110 is far from the second housing portion 120, the supporting inclined surface 131 and the supporting plate 300 are relatively moved to gradually drive the supporting plate 300 to be closer to the flexible screen 200.

In the embodiment of the present application, the electronic device may further include an elastic member 400, the elastic member 400 is connected between the support plate 300 and the device housing 100, and the elastic member 400 is used to drive the support plate 300 to move in a direction away from the flexible screen 200. The elastic member 400 may be a spring plate, a spring, or the like, and the application does not limit the type of the elastic member 400.

In the process of separating the first housing portion 110 from the second housing portion 120, the supporting inclined surface 131 may move along with the movement of the first housing portion 110 and move relative to the supporting plate 300, because the distance between the supporting inclined surface 131 and the flexible screen 200 gradually increases along the direction in which the first housing portion 110 separates from the second housing portion 120, when the supporting inclined surface 131 and the supporting plate 300 move relative to each other, the supporting plate 300 may be driven to move along the direction approaching the flexible screen 200, at this time, the elastic member 400 is compressed or stretched, when the first housing portion 110 and the second housing portion 120 separate to the unfolded state, the supporting plate 300 moves to the position contacting the flexible screen 200, and the supporting plate 300, the first housing portion 110 and the second housing portion 120 form a first screen supporting surface.

In the process that the first housing part 110 and the second housing part 120 are close to each other, the supporting inclined surface 131 can move along with the movement of the first housing part 110 and move relative to the supporting plate 300, because the distance between the supporting inclined surface 131 and the flexible screen 200 is gradually increased along the direction that the first housing part 110 is far away from the second housing part 120, when the supporting inclined surface 131 and the supporting plate 300 move relative to each other, the elastic member 400 is reset, the reset of the elastic member 400 can drive the supporting plate 300 to move along the direction that the supporting plate is far away from the flexible screen 200, when the first housing part 110 and the second housing part 120 are close to the contracted state, the supporting plate 300 moves to the position that is separated from the flexible screen 200, and the first housing part 110 and the second housing part 120 form a second screen supporting surface.

Therefore, the elastic member 400 may store energy during the process of moving the first housing portion 110 away from the second housing portion 120, release energy during the process of moving the first housing portion 110 close to the second housing portion 120, the released energy may drive the supporting plate 300 to move in the direction away from the flexible screen 200, and the elastic member 400 is further configured to assist the supporting plate 300 to move in the direction away from the flexible screen 200 during the process of moving the first housing portion 110 close to the second housing portion 120.

In the embodiment of the present application, the first housing portion 110 is provided with a rail 130, the rail 130 is in guiding fit with the device housing 100, and the supporting inclined surface 131 is provided on the surface of the rail 130 facing the flexible screen 200. The first housing part 110 is movable relative to the second housing part 120 guided by rails 130; the rail 130 guides the first housing portion 110 and the second housing portion 120 to move away from or close to each other, and the rail 130 provides a support slope 131, and the support slope 131 can drive the support plate 300 to move.

In the embodiment of the present application, the movement of the support plate 300 is not driven by an additional driving mechanism, and the driving of the support plate 300 can be realized by the rail 130 guiding the relative movement of the first housing part 110 and the second housing part 120 during the relative movement of the first housing part 110 and the second housing part 120, so that energy consumption can be reduced.

In this embodiment, the electronic device further includes a push rod 500, the push rod 500 is movably disposed in the device housing 100, the push rod 500 is connected to the supporting plate 300, the supporting inclined surface 131 and the push rod 500 can move relatively, and the supporting inclined surface 131 can drive the push rod 500 to move along with the movement of the first housing portion 110 to drive the supporting plate 300 to move. By arranging the push rod 500 to connect the supporting inclined surface 131 with the supporting plate 300, in the process that the first housing portion 110 and the second housing portion 120 are far away from or close to each other, the supporting inclined surface 131 and the push rod 500 move relatively, specifically, the supporting inclined surface 131 pushes the push rod 500, and the push rod 500 pushes the supporting plate 300, so that the supporting inclined surface 131 drives the supporting plate 300 to be close to or far away from the flexible screen 200.

In this embodiment, since the push rod 500 is provided, the push rod 500 is used to drive the support inclined plane 131 and the support plate 300, a certain distance can be provided between the support inclined plane 131 and the support plate 300, and the support inclined plane 131 does not extend to be directly connected with the support plate 300, so that occupation of too much space in the device housing 100 can be avoided, and weight of the electronic device can be reduced.

In the case that the electronic device includes the push rod 500, the elastic member 400 may be disposed on the outer circumference of the push rod 500, and the push rod 500 may be a guide direction of the elastic member 400, and if the elastic member 400 is a spring, the elastic member may be sleeved on the push rod 500.

In the embodiment of the present application, the electronic device further includes a roller 600, the roller 600 is rotatably disposed on the push rod 500, and the support slope 131 and the roller 600 can move relatively, specifically, can roll relatively, and the support slope 131 can drive the roller 600 to drive the push rod 500 to move along with the movement of the first housing portion 110. The roller 600 is arranged between the push rod 500 and the supporting inclined surface 131, the roller 600 can change sliding contact into rolling contact, friction force can be reduced, force required for separating the first housing part 110 and the second housing part 120 in the unfolding process can be reduced, abrasion caused by direct sliding contact of the push rod 500 and the supporting inclined surface 131 is avoided, and noise generated by direct sliding contact of the push rod 500 and the supporting inclined surface 131 is avoided.

In this embodiment, the device housing 100 further includes a nesting frame 140, the nesting frame 140 is a main body portion of the device housing 100, the nesting frame 140 provides a mounting base for other components of the electronic device, the first housing portion 110 and the second housing portion 120 are movably disposed on the nesting frame 140, the first housing portion 110 and the second housing portion 120 are both provided with a rail 130, and an inclination direction of the supporting inclined surface 131 of the rail 130 of the first housing portion 110 is symmetrical to an inclination direction of the supporting inclined surface 131 of the rail 130 of the second housing portion 120. The supporting plate 300 is movably disposed on the nesting frame 140. When the first housing portion 110 and the second housing portion 120 are both far away from the nesting frame 140, the support inclined surface 131 of the rail 130 drives the support plate 300 to move in a direction close to the flexible screen 200 so as to move to a position where the flexible screen 200 is in contact in an expanded state, and when the first housing portion 110 and the second housing portion 120 are both close to the nesting frame 140, the support plate 300 moves in a direction far away from the flexible screen 200 so as to move to a position where the flexible screen 200 is separated in a contracted state.

In this embodiment, the first housing part 110 and the second housing part 120 are provided with the rails 130, and the support of the support plate 300 with the rails 130 on both sides can be realized, so that the support plate 300 can support the flexible screen 200 more stably.

The nesting frame 140 may include a first position-limiting portion 141, the first position-limiting portion 141 is provided with a first position-limiting hole 1411, and the first position-limiting hole 1411 may be in guiding fit with the push rod 500 in a direction approaching to or departing from the flexible screen 200. Specifically, the push rod 500 is movably disposed in the first limiting hole 1411, the first limiting portion 141 provides an installation basis for the push rod 500, guides the moving direction of the push rod 500, and the push rod 500 can move relative to the nesting frame 140 along a direction close to or away from the flexible screen 200, when the first housing portion 110 and the second housing portion 120 are close to each other to the retracted state, the first limiting portion 141 is used for supporting the support plate 300, providing supporting and limiting effects for the support plate 300, and avoiding shaking.

Optionally, the first position-limiting portion 141 is a sheet-shaped structure extending from the nesting frame 140 and parallel to the extending direction of the flexible screen 200, a first position-limiting hole 1411 is disposed on the first position-limiting portion 141 of the sheet-shaped structure, and the push rod 500 is movably disposed in the first position-limiting hole 1411 and moves along the extending direction perpendicular to the first position-limiting portion 141.

The first position-limiting portion 141 provides a mounting base for the push rod 500, guides the moving direction of the push rod 500, and also provides a mounting base for the support plate 300.

In this embodiment, the nesting frame 140 further includes a second limiting portion 142, the second limiting portion 142 is provided with a second limiting hole 1422, the second limiting hole 1422 can be in guiding fit with the roller 600 in a direction close to or away from the flexible screen 200, and the second limiting portion 142 is in guiding fit with the rail 130. The second limiting portion 142 can provide a mounting base for the roller 600, and is also in guiding fit with the rail 130, when the first housing portion 110 and the second housing portion 120 move relative to the nesting frame 140, the second limiting portion 142 is in guiding fit with the rail 130 to guide the movement of the first housing portion 110 and the second housing portion 120.

Specifically, the second limiting portion 142 includes two opposite protruding pieces 1421, the protruding pieces 1421 are respectively provided with a second limiting hole 1422, and a guide space is formed between the two protruding pieces 1421 and is in guide fit with the guide space. The rails 130 can slidably engage with the tabs 1421 to achieve a guiding engagement, the two tabs 1421 providing a mounting base for the roller 600, and the space between the tabs 1421 just forms a guiding space for the rails 130, in which the guiding rails 130 can move to guide the movement of the first housing part 110 or the second housing part 120 relative to the nesting frame 140.

The second limiting hole 1422 is an elongated hole, two ends of the roller 600 are respectively provided with a pin 610, the roller 600 is rotatably and movably arranged in the second limiting hole 1422 through the pin 610, the pin 610 can move along the long axis of the elongated hole in the elongated hole and also can rotate in the elongated hole, the elongated hole can guide the moving direction of the roller 600, so that the moving direction of the push rod 500 is guided, meanwhile, the rolling of the roller 600 cannot be limited, therefore, the rolling of the roller 600 can be realized, the roller 600 can move along the elongated hole, and the roller 600 can move relative to the nesting frame 140 along the first direction.

In this embodiment, the push rod 500 may be provided with a connecting seat 510, the connecting seat 510 includes a connecting portion 511 and two opposite supporting portions 512, the supporting portions 512 are disposed on the connecting portion 511, the supporting portions 512 are provided with a connecting hole 5121, the connecting portion 511 is connected to the push rod 500, and the roller 600 is rotatably disposed in the connecting hole 5121 through a pin 610. The roller 600 may be disposed between the two supporting portions 512, the roller 600 is connected to the push rod 500 through the connecting seat 510, the roller 600 is rotatably connected to the push rod 500, and in the extending direction of the push rod 500, the push rod 500 and the roller 600 are relatively fixed, so that the movement of the roller 600 along the extending direction of the push rod 500 is transmitted to the push rod 500.

In the case that the elastic member 400 is a spring, the elastic member may be sleeved on the push rod 500 and located between the connection portion 511 and the first limiting portion 141.

The electronic device in the embodiment of the present application may be a smart phone, a tablet computer, an electronic book reader, a wearable device, or other devices, and the embodiment of the present application does not limit the specific kind of the electronic device.

In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An electronic device, comprising a device housing (100), a flexible screen (200) and a support plate (300), wherein the device housing (100) comprises a first housing part (110) and a second housing part (120), the first housing part (110) and the second housing part (120) are movably matched, and the flexible screen (200) is arranged on the first housing part (110) and the second housing part (120);

the first shell part (110) is provided with a supporting inclined surface (131), and the supporting plate (300) is matched with the supporting inclined surface (131);

the support plate (300) can move along the support inclined surface (131) in a direction facing close to the flexible screen (200) in the process of moving the first housing part (110) away from the second housing part (120) so as to support the flexible screen (200);

the support plate (300) is movable along the support slope (131) in a direction facing away from the flexible screen (200) to be separated from the flexible screen (200) during the approach of the first housing part (110) to the second housing part (120).

2. The electronic device of claim 1, wherein a distance between the support ramp (131) and the flexible screen (200) becomes gradually larger in a direction in which the first housing part (110) is away from the second housing part (120).

3. The electronic device of claim 1, further comprising a resilient member (400), wherein the resilient member (400) is connected between the support plate (300) and the device housing (100), and wherein the resilient member (400) is configured to drive the support plate (300) to move in a direction away from the flexible screen (200).

4. An electronic device according to claim 1, characterized in that the first housing part (110) is provided with a rail (130), the rail (130) being in guiding engagement with the device housing (100), the support ramp (131) being provided at a surface of the rail (130) facing the flexible screen (200).

5. The electronic device according to claim 4, further comprising a push rod (500), wherein the push rod (500) is movably disposed in the device housing (100), the push rod (500) is connected to the supporting plate (300), and the supporting inclined surface (131) and the push rod (500) are relatively movable, and the supporting inclined surface (131) drives the push rod (500) to move along with the movement of the first housing portion (110) so as to drive the supporting plate (300) to move in a direction approaching to or away from the flexible screen (200).

6. The electronic device according to claim 5, further comprising a roller (600), wherein the roller (600) is rotatably disposed on the push rod (500), and the supporting slope (131) and the roller (600) are movable relatively, and the supporting slope (131) drives the roller (600) to drive the push rod (500) to move along with the movement of the first housing portion (110).

7. The electronic device of claim 6, wherein the device housing (100) further comprises a nesting frame (140), wherein the first housing portion (110) and the second housing portion (120) are movably disposed on the nesting frame (140), and wherein the first housing portion (110) and the second housing portion (120) are respectively disposed with the rail (130), and wherein the support plate (300) is movably disposed on the nesting frame (140).

8. The electronic device of claim 7, wherein the nesting frame (140) comprises a first limiting portion (141), the first limiting portion (141) is provided with a first limiting hole (1411), the first limiting hole (1411) can be in guiding fit with the push rod (500) in a direction close to or away from the flexible screen (200), and the first limiting portion (141) is used for supporting the support plate (300) when the support plate (300) is separated from the flexible screen (200).

9. The electronic device of claim 7, wherein the nesting frame (140) further comprises a second limiting portion (142), the second limiting portion (142) is provided with a second limiting hole (1422), the second limiting hole (1422) can be in guiding fit with the roller (600) in a direction approaching or departing from the flexible screen (200), and the second limiting portion (142) is in guiding fit with the rail (130) in a process that the first housing portion (110) and the second housing portion (120) are away or approach.

10. The electronic device according to claim 9, wherein the second position-limiting portion (142) includes two opposite protruding pieces (1421), the protruding pieces (1421) are respectively provided with the second position-limiting holes (1422), a guiding space is formed between the two protruding pieces (1421), and the rail (130) is in guiding fit with the guiding space.

11. The electronic device of claim 10, wherein the second position-limiting hole (1422) is an oblong hole, two ends of the roller (600) are respectively provided with a pin (610), and the roller (600) is rotatably and movably disposed in the second position-limiting hole (1422) through the pin (610).

12. The electronic device of claim 11, wherein the push rod (500) is provided with a connecting seat (510), the connecting seat (510) comprises a connecting portion (511) and two opposite supporting portions (512), the supporting portions (512) are disposed on the connecting portion (511), the supporting portions (512) are provided with connecting holes (5121), the connecting portion (511) is connected with the push rod (500), and the roller (600) is rotatably disposed in the connecting holes (5121) through the pin shaft (610).