A smart speaker based on Internet of Things technology

Abstract

The present invention relates to the field of speaker technology, and discloses an intelligent speaker based on Internet of Things technology, including a speaker and a mounting base, wherein the bottom of the speaker is fixed to a rotating disk, the center of the bottom of the rotating disk is fixed to the output shaft of a control motor, the bottom of the control motor is fixed inside the mounting base, and a control module is embedded on the top of the mounting base. This intelligent speaker based on Internet of Things technology can provide a certain supporting and connecting effect on the connection between the side of the rotating disk and the inner wall of the mounting base by setting a rubber sealing ring, so that when the control speaker rotates, the rotating disk is always tightly attached to the inner side of the rubber sealing ring, and at the same time, the resistance force of the inner side of the rubber sealing ring to the rotating disk can also prevent a gap from appearing between the inner side of the rubber sealing ring and the rotating disk, thereby preventing impurities suspended in the outside air from entering the inside of the mounting base.

Description

Technical Field

[0001] The present invention relates to the technical field of sound boxes, and in particular to an intelligent sound box based on Internet of Things technology. Background Art

[0002] Smart home uses residence as platform, utilizes integrated wiring technology, network communication technology, security technology, automatic control technology, audio and video technology to integrate facilities related to home life, builds efficient management system of residential facilities and family schedule affairs, improves home safety, convenience, comfort, artistry, and realizes environmentally friendly and energy-saving living environment. Existing smart home generally connects the controllers of various household appliances to mobile phones through Internet of Things technology, so that household appliances can be controlled through mobile phones.

[0003] Speakers are a widely used broadcasting equipment. The existing intelligent control of speakers generally controls the playback or direction of the speakers. Controlling the direction of the speakers can adjust the sound direction of the speakers to prevent the sound effect of the speakers from being affected when the indoor layout changes. In areas with severe wind and sand, impurities suspended in the air may enter the control device through the gap between the speakers and the speaker control device, thereby causing damage to the components inside the speaker control device. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an intelligent speaker based on Internet of Things technology, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent speaker based on Internet of Things technology, including a speaker and a mounting base, the bottom of the speaker is fixed to a rotating disk, the center of the bottom of the rotating disk is fixed to the output shaft of the control motor, the bottom of the control motor is fixed inside the mounting base, a control module is embedded in the top of the mounting base, the control module is electrically connected to the control motor, the side of the rotating disk is in contact with the inner side of a rubber sealing ring, the outer side of the rubber sealing ring is fixed to the inner wall of the top of the mounting base, and a heat conduction cavity is opened at the center between the inner and outer sides of the rubber sealing ring, and the top of the heat conduction cavity is open.

[0008] Preferably, a translucent arc-shaped color plate is embedded on the rotating disk, a mounting block is fixed to the bottom of the inner wall of the mounting base, the top of the mounting block is hinged to the center of the lighting lamp, and elastic parts are arranged between the two sides of the top of the mounting block and the two sides of the bottom of the lighting lamp, the lighting lamp is located directly below the center of the translucent arc-shaped color plate, and the center of the circle of the translucent arc-shaped color plate is located on the central axis of the output shaft of the control motor.

[0009] Preferably, the portion of the rubber sealing ring located at the bottom of the heat conduction cavity is penetrated by two flow holes, and the two flow holes are symmetrically arranged on both sides of the heat conduction cavity. Reservoirs are arranged on both sides of the mounting base, and the outer wall of the reservoir is in close contact with the mounting base. The interior of the reservoir is hollowed out and an opening is arranged on the top, and the opening at the top of the reservoir is arranged directly below the flow hole.

[0010] Preferably, a control strip is fixed to the inner side of the rubber sealing ring, a plurality of protrusions are arranged on the inner side of the control strip, and a matching protrusion is fixed to the rear side of the top of the lighting lamp, and the matching protrusion is arranged between two protrusions on the control strip.

[0011] Preferably, a push block is provided inside the rotating disk, the top of the push block is fixed to the speaker through a connecting rod, both ends of the push block are in contact with the inner wall of the heat conduction cavity, the cross-section of the push block is triangular, and the side of the push block away from the speaker is a pointed end.

[0012] Preferably, an auxiliary cavity is hollowed out inside the pushing block, the interior of the auxiliary cavity is rotatably connected to one end of the swing plate, a counterweight knocking bar is fixed to the other end of the swing plate, gaps are provided between the counterweight knocking bar and both sides of the auxiliary cavity, longitudinally arranged arc grooves are opened inward on both side surfaces of the pushing block, guide plates are fixed on both sides of the tip of the pushing block, the bottom of the guide plate is arc-shaped, and the distance between the top of the arc-shaped part of the guide plate and the tip of the pushing block is smaller than the distance between the bottom and the tip of the pushing block.

[0013] (III) Beneficial effects

[0014] The present invention provides a smart speaker based on Internet of Things technology. It has the following beneficial effects:

[0015] (1) The smart speaker based on the Internet of Things technology can provide a certain supporting and connecting effect on the connection between the side of the rotating disk and the inner wall of the mounting base by setting a rubber sealing ring, so that when the speaker is controlled to rotate, the rotating disk is always tightly attached to the inner side of the rubber sealing ring. At the same time, the resistance force of the inner side of the rubber sealing ring on the rotating disk can also prevent the formation of a gap between the inner side of the rubber sealing ring and the rotating disk, thereby preventing impurities suspended in the outside air from entering the interior of the mounting base. At the same time, the part of the rubber sealing ring located inside the mounting base is relatively large, which can absorb the heat inside the mounting base to a certain extent. The provision of a heat conduction cavity can promote the dissipation of the heat absorbed by the rubber sealing ring.

[0016] (2) The smart speaker based on the Internet of Things technology can achieve the effect of a specific color atmosphere light by setting a translucent curved color plate and a lighting lamp, so that the playback device can cater to more users. The translucent curved color plate can change color after the angle of the speaker is adjusted by following the rotation of the rotating disk, thereby realizing the light color change function every time the user adjusts the angle, reducing the user's aesthetic fatigue, thereby further improving the effect of the playback device on catering to users.

[0017] (3) The smart speaker based on the Internet of Things technology will generate certain vibrations during the sound-producing process, which causes the dust on the surface of the speaker to be shaken off. The heat transfer cavity can be used to collect the shaken-off dust, thereby preventing the floor near the device from accumulating dust and increasing the cleaning frequency. At the same time, the circulation holes can be provided to transfer the dust collected in the heat transfer cavity into the storage device for centralized storage, thereby preventing the shape of the inner wall of the heat transfer cavity from increasing the difficulty of cleaning the heat transfer cavity.

[0018] (4) The smart speaker based on the Internet of Things technology can use the rotation of the rotating disk to push the matching protrusion by setting a control bar and a matching protrusion. The pushing effect causes the lighting lamp to exhibit a multiple rotation and reset effect, so that the light passing through the translucent arc color plate appears to be in a dynamic flashing state. Even in dim light or when the user has a weak perception of light color, the flashing light can be used to indicate that the angle of the speaker is being adjusted. At the same time, the lighting lamp can be transformed into a dynamic atmosphere light when the angle of the speaker is adjusted.

[0019] (5) The smart speaker based on the Internet of Things technology can use the adjustment of the angle of the speaker to push the dust in the heat conduction cavity by setting a connecting rod, thereby prompting the dust in the heat conduction cavity to move toward the circulation hole, thereby increasing the amount of dust in the heat conduction cavity moving to the inside of the storage device, and the rotation of the pushing block can also improve the air circulation effect inside the heat conduction cavity, thereby improving the heat dissipation effect of the heat conduction cavity.

[0020] (6) The smart speaker based on the Internet of Things technology can knock on the inner wall of the auxiliary cavity when the push block stops rotating by setting a swing plate and a counterweight knocking bar, and the side of the inner wall of the auxiliary cavity that is knocked is the side on which the push block pushes the dust to move. The knocking will cause the dust attached to the side on which the push block pushes the dust to move to fall off, preventing the dust from adhering to the side wall of the push block. The side of the push block will guide the air inside the heat transfer cavity to the tip of the push block. By setting a guide plate, this part of the air can be guided so that it flows upward to the outside of the heat transfer cavity, so as to promote the hot air in the heat transfer cavity to flow out of the heat transfer cavity. At the same time, the arc-shaped groove can prevent the dust from moving on the side of the push block. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional view of the installation base in the present invention;

[0023] Figure 3 For the present invention Figure 2 The enlarged structural diagram of part A in the middle;

[0024] Figure 4 It is a right side cross-sectional view of the mounting base in the present invention;

[0025] Figure 5 A bottom view of the rotating disk in the present invention;

[0026] Figure 6 It is a partial cross-sectional view of the pushing block in the present invention.

[0027] In the figure: 1. speaker; 2. mounting base; 21. control motor; 22. control module; 3. rotating disk; 31. translucent arc-shaped color plate; 32. control strip; 4. rubber sealing ring; 41. heat conduction cavity; 42. flow hole; 5. lighting lamp; 51. mounting block; 52. matching protrusion; 6. storage device; 7. pushing block; 71. connecting rod; 72. auxiliary cavity; 73. swing plate; 74. counterweight knocking strip; 75. arc-shaped groove; 76. guide plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] See also Figure 1 and Figure 2 A smart speaker based on Internet of Things technology includes a speaker 1 and a mounting base 2, the bottom of the speaker 1 is fixed to a rotating disk 3, the center of the bottom of the rotating disk 3 is fixed to the output shaft of a control motor 21, the bottom of the control motor 21 is fixed inside the mounting base 2, a control module 22 is embedded in the top of the mounting base 2, the control module 22 is electrically connected to the control motor 21, the side of the rotating disk 3 is in contact with the inner side of a rubber sealing ring 4, the outer side of the rubber sealing ring 4 is fixed to the inner wall of the top of the mounting base 2, and a heat conduction cavity 41 is opened at the center between the inner and outer sides of the rubber sealing ring 4, and the top of the heat conduction cavity 41 is open.

[0031] By providing the rubber sealing ring 4, a certain supporting and connecting effect can be achieved for the connection between the side of the rotating disk 3 and the inner wall of the mounting base 2, so that when the control audio 1 is rotated, the rotating disk 3 is always in close contact with the inner side of the rubber sealing ring 4. At the same time, the resistance force of the inner side of the rubber sealing ring 4 to the rotating disk 3 can also prevent the formation of a gap between the inner side of the rubber sealing ring 4 and the rotating disk 3, thereby preventing impurities suspended in the outside air from entering the mounting base 2. At the same time, the portion of the rubber sealing ring 4 located inside the mounting base 2 is relatively large, which can absorb the heat inside the mounting base 2 to a certain extent. The provision of the heat conduction cavity 41 can promote the dissipation of the heat absorbed by the rubber sealing ring 4.

[0032] When the present embodiment is in use, a network signal is first sent out using a mobile phone, and the signal is transmitted to the control module 22. The control module 22 converts the signal and transmits it to the control motor 21, so that the control motor 21 is turned on. The output shaft of the control motor 21 drives the speaker 1 to rotate through the rotating disk 3. At this time, the orientation of the sound-emitting surface of the speaker 1 at the top of the mounting base 2 can be adjusted, and then the sound-emitting direction of the speaker 1 can be adjusted, thereby improving the comfort of use of the device. At the same time, during the operation of the mounting base 2, part of the heat generated inside the mounting base 2 will be transferred to the rubber sealing ring 4. Since the heat conduction cavity 41 makes the contact surface of the rubber sealing ring 4 with the outside world larger, the heat dissipation rate on the rubber sealing ring 4 can be increased.

[0033] Embodiment 2:

[0034] See also Figure 1 , Figure 2 and Figure 4 On the basis of Example 1, in this embodiment, a translucent arc-shaped color plate 31 is embedded on the rotating disk 3, and the colors of different places on the translucent arc-shaped color plate 31 are different. A mounting block 51 is fixed to the bottom of the inner wall of the mounting base 2, and the top of the mounting block 51 is hinged to the center of the illuminating lamp 5, and elastic parts are arranged between the two sides of the top of the mounting block 51 and the two sides of the bottom of the illuminating lamp 5. The illuminating lamp 5 is closable, and the illuminating lamp 5 is located directly below the center of the translucent arc-shaped color plate 31. The center of the circle of the translucent arc-shaped color plate 31 is located on the central axis of the output shaft of the control motor 21.

[0035] By setting the translucent arc color plate 31 and the lighting lamp 5, the effect of a specific color atmosphere light can be achieved, so that the playback device can cater to more users, and the translucent arc color plate 31 follows the rotation of the rotating disk 3 to achieve a color change function after the angle of the speaker 1 is adjusted, thereby realizing the light color change function every time the user adjusts the angle, reducing the user's aesthetic fatigue, thereby further improving the playback device's catering effect to users.

[0036] When this embodiment is in use, the light irradiated by the lighting lamp 5 is directed upward, the light passes through the translucent arc-shaped color plate 31 and the color of the light changes, and in the process of adjusting the rotation of the audio system 1, the rotating disk 3 will rotate, and the rotating disk 3 will drive the translucent arc-shaped color plate 31 to rotate, so that the position of the lighting lamp 5 toward the translucent arc-shaped color plate 31 changes, and thus the color of the light passing through the translucent arc-shaped color plate 31 also changes.

[0037] Embodiment 3:

[0038] See also Figure 2 and Figure 3 On the basis of Example 1, in this embodiment, the portion of the rubber sealing ring 4 located at the bottom of the heat conducting cavity 41 is penetrated by two flow holes 42, and the two flow holes 42 are symmetrically arranged on both sides of the heat conducting cavity 41. Reservoirs 6 are arranged on both sides of the mounting base 2, and the outer wall of the reservoir 6 is in close contact with the mounting base 2. The interior of the reservoir 6 is hollowed out and an opening is arranged on the top. The opening located at the top of the reservoir 6 is arranged directly below the flow hole 42.

[0039] During the sound-generating process of the speaker 1, a certain vibration is generated, and the dust on the surface of the speaker 1 is shaken off. The heat transfer cavity 41 can be provided to collect the shaken off dust, thereby preventing the ground near the device from accumulating dust and increasing the cleaning frequency. At the same time, the flow hole 42 can be provided to transfer the dust collected in the heat transfer cavity 41 into the storage 6 for centralized storage, thereby preventing the shape setting of the inner wall of the heat transfer cavity 41 from increasing the difficulty of cleaning the heat transfer cavity 41.

[0040] When this embodiment is in use, the vibration generated by the sound of the speaker 1 will cause the dust on its surface to fall off, and the fallen dust will fall to the top of the mounting base 2 under the action of gravity, and the vibration of the speaker 1 will be transmitted to the mounting base 2, so that the dust on the top of the mounting base 2 can be vibrated into the heat transfer cavity 41 for storage, and the vibration caused by the continuous sound of the speaker 1 will flatten the dust stored in the heat transfer cavity 41, and part of the dust in the heat transfer cavity 41 will move to the circulation hole 42 and pass through the circulation hole 42 into the storage container 6. When the dust in the storage container 6 needs to be cleaned, the storage container 6 can be directly pulled out, which makes dust cleaning more convenient.

[0041] Embodiment 4:

[0042] See also Figure 4 and Figure 5 On the basis of Example 2, in this embodiment, a control strip 32 is fixed to the inner side of the rotating disk 3, a plurality of protrusions are arranged on the inner side of the control strip 32, a matching protrusion 52 is fixed to the rear side of the top of the lighting lamp 5, and the matching protrusion 52 is arranged between two protrusions on the control strip 32.

[0043] By setting the control strip 32 and the matching protrusion 52, the rotation of the rotating disk 3 can be utilized to produce a pushing effect on the matching protrusion 52, and the pushing effect makes the lighting lamp 5 present a multiple rotation reset effect, so that the light passing through the translucent arc color plate 31 presents a dynamic flickering state. Even in the case of dim light or the user's perception of light color is weak, it can be known from the flickering light that the angle of the speaker 1 is being adjusted. At the same time, the effect of converting the lighting lamp 5 into a dynamic atmosphere lamp can also be achieved when the angle of the speaker 1 is adjusted.

[0044] When the present embodiment is in use, when the audio system 1 is adjusted and rotated, the rotating disk 3 will also rotate, and the rotating disk 3 will drive the control strip 32 to rotate. The multiple protrusions on the inner side of the control strip 32 will generate thrust on the matching protrusion 52, thereby causing the lighting lamp 5 to rotate and squeeze the elastic member between the mounting block 51 and the lighting lamp 5. When the protrusions on the inner side of the control strip 32 are disengaged from the matching protrusion 52, the lighting lamp 5 will be reset under the action of the elastic member, and the lighting lamp 5 can present a dynamic flashing effect.

[0045] Embodiment 5:

[0046] See also Figure 1 and Figure 6 On the basis of Example 1, in this embodiment, a push block 7 is provided inside the rubber sealing ring 4, the top of the push block 7 is fixed to the speaker 1 through a connecting rod 71, both ends of the push block 7 are in contact with the inner wall of the heat conduction cavity 41, the cross-section of the push block 7 is triangular, and the side of the push block 7 away from the speaker 1 is a pointed end.

[0047] By setting the connecting rod 71, the angle of the speaker 1 can be adjusted to push the dust in the heat conduction cavity 41, thereby prompting the dust in the heat conduction cavity 41 to move toward the circulation hole 42, and the amount of dust in the heat conduction cavity 41 moving to the inside of the storage 6 can be increased, and the rotation of the pushing block 7 can also improve the air circulation effect inside the heat conduction cavity 41, thereby improving the heat dissipation effect of the heat conduction cavity 41.

[0048] When this embodiment is in use, the speaker 1 rotates to drive the push block 7 to rotate through the connecting rod 71, and the two side surfaces of the push block 7 will produce a pushing effect on the inner wall of the heat conduction cavity 41, so that the dust accumulated at the bottom of the inner wall of the heat conduction cavity 41 is pushed, and the pushing direction of the dust during the rotation of the push block 7 is towards the direction of the circulation hole 42, so that more dust in the heat conduction cavity 41 can be moved to the storage 6 through the circulation hole 42.

[0049] Embodiment 6:

[0050] See also Figure 6On the basis of Example 5, in this embodiment, an auxiliary cavity 72 is hollowed out inside the pushing block 7, and the inside of the auxiliary cavity 72 is rotatably connected to one end of the swing plate 73. A counterweight knocking strip 74 is fixed to the other end of the swing plate 73. There are gaps between the counterweight knocking strip 74 and both sides of the auxiliary cavity 72. Both sides of the pushing block 7 are provided with longitudinally arranged arc grooves 75 inwardly, and guide plates 76 are fixed on both sides of the tip of the pushing block 7. The bottom of the guide plate 76 is arc-shaped, and the distance between the top of the arc-shaped part of the guide plate 76 and the tip of the pushing block 7 is smaller than the distance between the bottom and the tip of the pushing block 7.

[0051] By setting the swing plate 73 and the counterweight knocking bar 74, the inner wall of the auxiliary cavity 72 can be knocked when the pushing block 7 stops rotating, and the side of the inner wall of the auxiliary cavity 72 that is knocked is the side where the pushing block 7 pushes the dust to move. The knocking will cause the dust attached to the side where the pushing block 7 pushes the dust to move to fall off, preventing the dust from adhering to the side wall of the pushing block 7. The side of the pushing block 7 will guide the air inside the heat conduction cavity 41 to the tip of the pushing block 7. By setting the guide plate 76, this part of the air can be guided so that it flows upward to the outside of the heat conduction cavity 41 to promote the hot air in the heat conduction cavity 41 to flow out of the heat conduction cavity 41. At the same time, the arc groove 75 can be set to prevent dust from moving on the side of the pushing block 7.

[0052] When the present embodiment is in use, during the rotation of the push block 7 inside the heat conduction cavity 41, the counterweight knocking bar 74 and the swing plate 73 will rotate in the direction away from the side where the push block 7 pushes the dust to move and get close to the inner wall of the auxiliary cavity 72 under the action of inertia. When the push block 7 stops rotating, the swing plate 73 and the counterweight knocking bar 74 will rotate in the direction close to the side where the push block 7 pushes the dust to move and hit the inner wall of the auxiliary cavity 72 under the action of inertia. The kinetic energy of the counterweight knocking bar 74 hitting the inner wall of the auxiliary cavity 72 causes the dust attached to the push block 7 to fall off, and can also generate dust on the inner wall of the heat conduction cavity 41. A certain pushing effect is provided to further encourage the dust to move toward the circulation hole 42; during the movement of the pushing block 7, part of the dust will slide and get stuck in the arc groove 75 under the guidance of the inclined effect of the side of the pushing block 7, preventing too much dust from moving to the tip of the pushing block 7 and affecting the connection between the pushing block 7 and the inner wall of the heat conduction cavity 41. The inclined side of the pushing block 7 will guide the air inside the heat conduction cavity 41, so that the air moves toward the tip of the pushing block 7. The airflow moving to the tip of the pushing block 7 moves upward under the guidance of the arc-shaped part at the bottom of the guide plate 76 until the airflow moves out of the heat conduction cavity 41.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent speaker based on Internet of Things technology, comprising a speaker (1) and a mounting base (2), characterized in that: The bottom of the speaker (1) is fixed to the rotating disk (3), the center of the bottom of the rotating disk (3) is fixed to the output shaft of the control motor (21), the bottom of the control motor (21) is fixed inside the mounting base (2), the top of the mounting base (2) is embedded with a control module (22), the control module (22) is electrically connected to the control motor (21), the side of the rotating disk (3) abuts against the inside of the rubber sealing ring (4), the outside of the rubber sealing ring (4) is fixed to the inner wall of the top of the mounting base (2), and a heat conduction cavity (41) is opened at the center between the inner and outer sides of the rubber sealing ring (4), and the top of the heat conduction cavity (41) is open; A translucent arc-shaped color plate (31) is embedded on the rotating disk (3), a mounting block (51) is fixed to the bottom of the inner wall of the mounting base (2), the top of the mounting block (51) is hinged to the center of the illuminating lamp (5), and elastic members are provided between the two sides of the top of the mounting block (51) and the two sides of the bottom of the illuminating lamp (5), the illuminating lamp (5) is located directly below the center of the translucent arc-shaped color plate (31), and the center of the circle of the translucent arc-shaped color plate (31) is located on the central axis of the output shaft of the control motor (21); The portion of the rubber sealing ring (4) located at the bottom of the heat-conducting cavity (41) is penetrated by two circulation holes (42), and the two circulation holes (42) are symmetrically arranged on both sides of the heat-conducting cavity (41). Storage containers (6) are arranged on both sides of the mounting base (2), and the outer wall of the storage container (6) is in close contact with the mounting base (2). The interior of the storage container (6) is hollowed out and an opening is arranged at the top. The opening at the top of the storage container (6) is arranged directly below the circulation hole (42); A control strip (32) is fixed to the bottom of the rotating disk (3), a plurality of protrusions are arranged on the inner side of the control strip (32), a matching protrusion (52) is fixed to the rear side of the top of the lighting lamp (5), and the matching protrusion (52) is arranged between two protrusions on the control strip (32); A push block (7) is arranged inside the rubber sealing ring (4); the top of the push block (7) is fixed to the speaker (1) via a connecting rod (71); both ends of the push block (7) are in contact with the inner wall of the heat conduction cavity (41); the cross-section of the push block (7) is triangular, and the side of the push block (7) away from the speaker (1) is a pointed end; An auxiliary cavity (72) is hollowed out inside the push block (7), and the inside of the auxiliary cavity (72) is rotatably connected to one end of the swing plate (73). A counterweight knocking strip (74) is fixed to the other end of the swing plate (73), and a gap is provided between the counterweight knocking strip (74) and both sides of the auxiliary cavity (72). Both sides of the push block (7) are provided with longitudinally arranged arc grooves (75) inwardly, and guide plates (76) are fixed on both sides of the tip of the push block (7), and the bottom of the guide plate (76) is in an arc shape, and the distance between the top of the arc-shaped part of the guide plate (76) and the tip of the push block (7) is smaller than the distance between the bottom and the tip of the push block (7).

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