CN210670270U - A single-slide desktop camera blocking device - Google Patents

Abstract

The utility model discloses a single sliding table camera shielding device, comprising a bracket, a linear transmission mechanism and a motor for driving the linear transmission mechanism are arranged on the bracket, a sliding table is arranged on the linear transmission mechanism, and a first blocking plate is arranged on the sliding table and the second blocking piece, the first blocking piece and the second blocking piece are respectively located on both sides of the sliding table movement direction, the linear transmission mechanism can drive the sliding table movement so that the first blocking piece and the second blocking piece respectively block and open the corresponding sliding table. Front camera and rear camera. The utility model has the advantages of simple structure, convenient operation, stable and reliable movement, and can timely block the front camera and the rear camera according to the needs of the user, thereby protecting the information security and privacy security of the user, and preventing Trojan horses or hacker software from being uninformed by the user. In the case of turning on the camera and infringing the user's privacy, the stability, security and reliability are high.

Description

Single-sliding-table type camera shielding device

Technical Field

The utility model relates to an electronic product technical field especially relates to a single slip table formula camera shelters from device.

Background

With the rapid development of electronic technology, 3C electronic products have been widely used in work and life of people, especially mobile terminal electronic devices such as mobile phones, tablet computers, and notebooks, and 3C electronic products are short for computers (computers), Communication (Communication), and consumer electronics (consumer electronics). At present, a camera is used as an important device for camera shooting and video communication, is available around people, and has become a standard configuration of mobile terminal electronic products such as mobile phones, tablet computers, notebooks and the like, such as a front camera, a rear camera and the like.

However, these electronic products bring rich experience and convenience to users, and also bring some hidden dangers and risks to the information security and privacy security of users, under the condition that these products are networked, some trojans or hacker software may maliciously invade and attack their cameras, even if the cameras are already closed in the setting, the trojans or hacker software can still secretly and secretly open the cameras in the background, thereby monitoring and taking pictures of users, and invading the privacy of users under the condition that the users are not aware of. Although many antivirus software exists, the software of the existing trojans or hackers is higher and is more concealed, so some users can block the camera by using adhesive tapes or stickers, but the use is inconvenient and the appearance is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that exists in the use of above-mentioned current electronic product, a single slip table formula camera shelters from device is proposed.

In order to solve at least one of the above technical problems, the utility model provides a following technical scheme:

the utility model provides a device is sheltered from to single slip table formula camera, which comprises a bracket, be provided with linear drive mechanism and drive linear drive mechanism's motor on the support, the last slip table that is provided with of linear drive mechanism, be provided with first separation blade and second separation blade on the slip table, first separation blade and second separation blade are located the both sides of slip table direction of motion respectively, linear drive mechanism can drive the slip table motion so that first separation blade and second separation blade shelter from respectively and open corresponding leading camera and rearmounted camera.

The utility model has the advantages that: the shielding device is installed in a corresponding electronic product, the motor drives the linear transmission mechanism to move, the linear transmission mechanism drives the sliding table to stably move linearly, the sliding table drives the first blocking piece and the second blocking piece to move together, the first blocking piece can shield and open a corresponding front camera through moving, and the second blocking piece can shield and open a corresponding rear camera through moving, so that the front camera and the rear camera of the electronic product can be shielded and opened, the shielding device is simple in structure, convenient to operate, stable and reliable in movement, capable of shielding the front camera and the rear camera according to the needs of users in time, thereby protecting the information safety and privacy safety of the users, preventing Trojan horse or hacker software and the like from invading the privacy of the users by opening the cameras under the situation that the users are unaware, high in stability, safety and reliability, and installed in the corresponding electronic product, the use and the beauty of the electronic product are not influenced.

In some embodiments, the linear transmission mechanism includes a screw rod and a guide mechanism disposed parallel to the screw rod, the sliding table is in threaded connection with the screw rod and is in sliding connection with the guide mechanism, and the screw rod is driven by a motor.

In some embodiments, the guide mechanism is a guide rod, and the sliding table is provided with a first guide hole matched with the guide rod.

In some embodiments, a third bearing matched with one end of the screw rod away from the motor and a dust guard matched with the third bearing are arranged on the bracket.

In some embodiments, the motor is connected with an external circuit through an FPC board, a plurality of sensors for detecting the position of the sliding table are sequentially arranged on the bracket along the movement direction of the sliding table, and the sliding table is provided with a sensing block which can be matched with the sensors.

In some embodiments, the first blocking piece and the second blocking piece are respectively and rotatably connected with the sliding table, and the sliding table can be moved by a straight line to drive the first blocking piece and the second blocking piece to rotate so as to respectively block and open the corresponding front camera and the corresponding rear camera.

In some embodiments, a first fixing shaft rotatably connected with the first blocking piece is arranged on the sliding table, a first guide sliding groove is arranged on the first blocking piece in the radial direction of the first fixing shaft, a first guide pillar matched with the first guide sliding groove is arranged on the support, the sliding table moves linearly and limits the first guide sliding groove to slide through the first guide pillar, so that the first blocking piece can rotate around the first fixing shaft to block and open the corresponding front camera.

In some embodiments, the first blocking sheet is provided with a first bearing matched with the first fixed shaft and a first dust cover matched with the first bearing.

In some embodiments, a second fixed shaft rotatably connected with the second blocking piece is arranged on the sliding table, a second guide chute is arranged on the second blocking piece along the radial direction of the second fixed shaft, and the sliding table moves linearly and limits the second guide chute to slide through a corresponding second guide pillar outside, so that the second blocking piece can rotate around the second fixed shaft to block and open the corresponding rear camera.

In some embodiments, a second bearing matched with the second fixed shaft and a second dust cover matched with the second bearing are arranged on the second baffle.

In addition, in the technical solutions of the present invention, the technical solutions can be implemented by adopting conventional means in the art, which are not specifically described.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first perspective view of a single-stage sliding table type camera shielding device provided by the embodiment of the present invention.

Fig. 2 is a second perspective view of the single-stage sliding table type camera shielding device provided by the embodiment of the present invention.

Fig. 3 is a first perspective view of a bracket according to an embodiment of the present invention.

Fig. 4 is a second perspective view of a bracket according to an embodiment of the present invention.

Fig. 5 is a first perspective view of the sliding table provided in the embodiment of the present invention.

Fig. 6 is a second perspective view of the sliding table provided in the embodiment of the present invention.

Fig. 7 is a perspective view of a first blocking sheet according to an embodiment of the present invention.

Fig. 8 is a perspective view of a second blocking sheet according to an embodiment of the present invention.

The reference numerals in the drawings indicate that the bracket 1, the third bearing 101, the sensor 102, the first guide post 11, the dust guard 12, the fixing plate 13, the first avoidance through hole 14, the second groove body 15, the motor 2, the linear transmission mechanism 3, the lead screw 31, the guide mechanism 32, the guide rod 321, the specially-made nut 33, the spring 34, the buffer plate 35, the sliding table 4, the avoidance groove 401, the first fixing shaft 41, the second fixing shaft 42, the first guide hole 43, the sensing block 44, the first groove body 45, the first through hole 46, the second through hole 47, the third through hole 48, the guide sleeve 49, the first blocking piece 5, the first guide sliding groove 51, the first bearing 52, the first dust guard 53, the second blocking piece 6, the second guide sliding groove 61, the second bearing 62, the second dust guard 63, the positioning groove 64, the thickened portion 65, the FPC board 7, and the transmission 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of but not limiting of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "upper," "lower," "primary," "secondary," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between various components and not to indicate or imply relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is the embodiment of the utility model provides a single slip table formula camera shelters from device's first stereogram, fig. 2 is the utility model provides a single slip table formula camera shelters from device's second stereogram, fig. 3 is the utility model provides a support's first stereogram, fig. 4 is the utility model discloses a support's second stereogram, fig. 5 is the utility model discloses a slip table's first stereogram, fig. 6 is the utility model discloses a second stereogram, fig. 7 is the utility model discloses a first separation blade's that the embodiment provides stereogram, fig. 8 is the utility model provides a second separation blade's that the embodiment provides.

Example (b):

as shown in fig. 1-8, a single-sliding desk type camera sheltering device is mainly installed in mobile terminal electronic products such as mobile phones, tablet computers, notebooks and the like, the latter camera and the front camera for shielding the electronic products according to the needs of users, the shielding device comprises a support 1, the support 1 is usually installed on corresponding parts of an electronic product, a linear transmission mechanism 3 and a motor 2 for driving the linear transmission mechanism 3 are arranged on the support 1, a sliding table 4 is arranged on the linear transmission mechanism 3, a first blocking piece 5 and a second blocking piece 6 are arranged on the sliding table 4, the first blocking piece 5 and the second blocking piece 6 are respectively positioned at two sides of the sliding table 4 in the motion direction, the linear transmission mechanism 3 can drive the sliding table 4 to move so that the first blocking piece 5 and the second blocking piece 6 can respectively shield and open corresponding front cameras and rear cameras, therefore, the corresponding front camera and the rear camera can be shielded or opened simultaneously according to the needs of the user. Generally, in the initial state, the front camera and the rear camera of the electronic product are not shielded, when a user needs to shield the camera for calling and the like, the shielding device can be controlled to move to shield the front camera and the rear camera through the control interface of the electronic product, and the shielding device is controlled to return to the initial state after the use is finished, so that the information safety and the privacy safety of the user are protected.

In the use, should shelter from the device and settle in the cell-phone, the panel computer, in mobile terminal electronic products such as notebook, when the user carries out the use that needs to shelter from the camera, 3 motions of motor 2 drive linear transmission mechanism, 3 drive slip table 4 of linear transmission mechanism carry out linear motion steadily, slip table 4 drives first separation blade 5 and second separation blade 6 and moves together, corresponding leading camera can be sheltered from in the motion of first separation blade 5, corresponding rear camera can be sheltered from in second separation blade 6, after the use, make slip table 4 drive first separation blade 5 and second separation blade 6 reverse motion together in order to relieve the sheltering from to leading camera and rear camera again, thereby realize that this shelters from the device and shelter from and open leading camera and the rear camera of electronic product. Compared with the prior art, the utility model has the advantages of simple structure, it is compact, and convenient for operation, it is steady to move, reliably, can shelter from leading camera and rear camera in due time according to user's needs, thereby protect user's information security and privacy safety, prevent that Trojan horse or hacker software etc. from opening the camera and invading user's privacy under the condition that the user is not aware of, stability, security and reliability are high, and install inside corresponding electronic product, do not influence electronic product's use and pleasing to the eye etc., thereby can strengthen the competitiveness of product, expand the application and the development of product.

The linear transmission mechanism 3 comprises a screw rod 31 and a guide mechanism 32 arranged in parallel with the screw rod 31, the sliding table 4 is in threaded connection with the screw rod 31 and is in sliding connection with the guide mechanism 32, a threaded hole or a nut matched with the screw rod 31 and a guide hole or a guide hole matched with the guide mechanism 32 are arranged on the sliding table 4, the screw rod 31 is usually driven by the motor 2, can be directly driven by the motor 2, and can also be driven by the motor 2 through the transmission 8, so that the rotating speed of the screw rod 31, namely the linear motion speed of the sliding block, can be better controlled. In the use, motor 2 drive lead screw 31 rotates, and along with the rotation of lead screw 31, slip table 4 carries out linear motion along lead screw 31 and guiding mechanism 32 under guiding mechanism 32's restriction, simple structure, convenient operation, and stability is good, and the reliability is high. In addition, the linear transmission mechanism 3 can be replaced by other mechanisms capable of linearly moving the sliding table 4 in the prior art.

The guide mechanism 32 is a guide rod 321, the sliding table 4 is provided with a first guide hole 43 matched with the guide rod 321, the structure is simple, the operation is convenient, and the guide mechanism 32 can also guide the linear motion of the sliding table 4 by adopting a way of matching a track and a guide rail or other ways. The sliding table 4 is provided with a special nut 33 matched with the screw rod 31, the special nut 33 is provided with a threaded hole matched with the screw rod 31, and the first guide hole 43 is also arranged on the special nut 33, so that the structure is more compact and stable.

Still be provided with first through-hole 46 on the slip table 4, lead screw 31 and guide bar 321 pass first through-hole 46, the one end intercommunication of tailor-made nut 33 and first through-hole 46, the other end of first through-hole 46 is provided with second through-hole 47 and third through-hole 48 with lead screw 31 and guide bar 321 matched with, still can set up guide pin bushing 49 with guide bar 321 matched with in the third through-hole 48, guide pin bushing 49 also can be linear bearing, oilless bush etc. processing like this, it is more convenient to assemble, also can alleviate the weight of slip table 4.

Be provided with on the support 1 and keep away from motor 2's one end matched with third bearing 101 and with third bearing 101 matched with dust guard 12 with lead screw 31, be provided with on the support 1 usually with guide bar 321 and lead screw 31 both ends matched with fixed plate 13, third bearing 101 and dust guard 12 set up on fixed plate 13, be convenient for lead screw 31 more stable through third bearing 101, rotate reliably, dust guard 12 can protect third bearing 101 better, the life of extension third bearing 101, can also set up the second cell body 15 of settling dust guard 12 on the fixed plate 13, and the operation is convenient, and the structure is compacter, and is stable. Elastic parts such as a spring 34 matched with the sliding table 4 can be arranged on the guide rod 321, the spring 34 is sleeved on the screw rod 31, the spring 34 is located between the sliding table 4 and the fixing plate 13, two ends of the spring 34 are respectively connected with the sliding table 4 and the fixing plate 13 or are abutted to press fit, so that buffer protection is performed in the movement of the sliding table 4, the sliding table 4 can be conveniently reset better, and the elastic parts can also be other suitable elastic parts such as elastic blocks fixed on the support 1. Can be provided with on the fixed plate 13 with 4 matched with buffer board 35 of slip table, can cushion protection through buffer board 35 to the motion of slip table 4, noise abatement, it is safer, stable, reliable, the material of buffer board 35 can adopt rubber, polyurethane or bubble are cotton etc., rubber has elasticity, intensity is high, advantages such as low price, polyurethane has higher flexibility, the resilience, mechanical strength and oxidative stability and advantages such as good oil resistance, the bubble is cotton has elasticity, light in weight, quick pressure-sensitive fixed, high durability and convenient use, it is flexible to bend, the volume is ultra-thin, advantages such as dependable performance.

Motor 2 passes through FPC board 7 and external circuit connection, for example the main circuit board or the control chip etc. of electronic product, the direction of motion of following slip table 4 on the support 1 has set gradually a plurality of inductors 102 that are used for detecting the 4 positions of slip table, be provided with on the slip table 4 can with inductor 102 matched with response piece 44, the quantity of inductor 102 is decided according to specific demand, response piece 44 cooperatees the position of motion of accurate positioning slip table 4 of being convenient for with inductor 102, thereby the first separation blade 5 of accurate control and second separation blade 6 shelter from and open leading camera and rear camera. The sliding table 4 can be further provided with a first groove body 45 for accommodating the sensing block 44, and the sensing block 44 is arranged in the first groove body 45, so that the operation is more convenient, and the structure is more compact and stable. The FPC board 7 is a Flexible Printed Circuit (FPC), which is a highly reliable and highly Flexible Printed Circuit board made of a polyimide or polyester film as a base material, and has the characteristics of high wiring density, light weight, thin thickness, and good bendability.

The bracket 1 and the inductor 102 can also be fixed on a PCB corresponding to an electronic product, the bracket 1 is provided with a first avoiding through hole 14 correspondingly matched with the inductor 102 and the induction block 44, the PCB, i.e. a printed circuit board or a printed circuit board, is an important electronic component, is a support body of an electronic component, is a carrier for electrical connection of the electronic component, and is convenient for electrical connection with the inductor 102, the motor 2 and the like.

Generally, the sensor 102 may be a hall sensor, the sensing block 44 may be a permanent magnet, the hall sensor is a magnetic field sensor manufactured according to the hall effect, the hall sensor has a firm structure, a small volume, a light weight, a long service life, a convenient installation, a small power consumption, a high frequency, a vibration resistance, a resistance to contamination or corrosion of dust, oil stain, water vapor, salt mist and the like, a high precision, a good linearity and the like. The permanent magnet is a magnet capable of retaining high remanence for a long time in an open circuit state, is also called a hard magnet, such as magnetic steel, a neodymium magnet, a permanent magnet made of ferrite permanent magnet material and the like, preferably the magnetic steel, has the characteristics of high hardness, high coercive force value, high temperature resistance, strong corrosion resistance and the like, has good permanent magnet property, and can still retain strong and stable magnetism for a long time after an external magnetic field is removed after the magnetic steel is saturated and magnetized.

First separation blade 5 and second separation blade 6 rotate with slip table 4 respectively and are connected, and 4 rectilinear motion of slip table can promote first separation blade 5 and second separation blade 6 to rotate in order to shelter from respectively and open corresponding leading camera and rearmounted camera. Specifically, the sliding table 4 is provided with a first fixed shaft 41 rotatably connected to the first blocking plate 5 and a second fixed shaft 42 rotatably connected to the second blocking plate 6, the first blocking plate 5 is provided with a first guide sliding groove 51 along the radial direction of the first fixed shaft 41, the bracket 1 is provided with a first guide post 11 matched with the first guide sliding groove 51, the second blocking plate 6 is provided with a second guide sliding groove 61 along the radial direction of the second fixed shaft 42, the second guide sliding groove 61 can be matched with a corresponding second guide post outside, and the second guide post is generally disposed in a housing of an electronic product. In the use, when slip table 4 carries out linear motion, owing to inject first direction spout 51 and slide and inject second direction spout 61 and slide through the corresponding second guide pillar of outside through first guide pillar 11, so along with the linear motion of slip table 4, first separation blade 5 can only rotate around first fixed axle 41, smooth second separation blade 6 can only rotate around second fixed axle 42, thereby make first separation blade 5 shelter from and open corresponding leading camera, make second separation blade 6 can shelter from and open corresponding rear camera, and the operation is convenient, and the structure is simple, compact, and stable.

The first baffle 5 is provided with a first bearing 52 matched with the first fixing shaft 41 and a first dustproof cover 53 matched with the first bearing 52, the second baffle 6 is provided with a second bearing 62 matched with the second fixing shaft 42 and a second dustproof cover 63 matched with the second bearing 62, usually, the first fixing shaft 41 is provided with a step matched with an inner ring of the first bearing 52, the second fixing shaft 42 is provided with a step matched with an inner ring of the second bearing 62, the first baffle 5 is provided with a groove body matched with the first dustproof cover 53, the second baffle 6 is provided with a groove body matched with the second dustproof cover 63, so that the first baffle 5 and the second baffle 6 can rotate more stably and reliably, and the first dustproof cover 53 and the second dustproof cover 63 can better protect the first bearing 52 and the second bearing 62 to prolong the service life of the bearings. Be provided with thickening portion 65 on the second flap 6, second bearing 62 and second shield 63 set up at thickening portion 65, are provided with on the slip table 4 and dodge groove 401 with thickening portion 65 matched with, and second fixed axle 42 sets up in dodging groove 401, and the structure is compacter like this, firm, and it is more firm to connect, but also can have certain limiting displacement to the rotation of second flap 6. The second barrier 6 is further provided with a positioning groove 64, and the positioning groove 64 is generally convenient for the second barrier 6 to be positioned and matched with corresponding parts on the electronic product at the initial position, so that the second barrier is more stable and reliable.

The foregoing are only embodiments of the present invention, which are not intended to limit the scope of the present invention, and it should be understood that modifications and substitutions can be made by those skilled in the art without departing from the inventive concept, and all such modifications and substitutions are intended to be included within the scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.

Claims (10)

1. A single-slide desktop camera shielding device, characterized in that it comprises a bracket (1), and the bracket (1) is provided with a linear transmission mechanism (3) and a motor (2) that drives the linear transmission mechanism (3). ), the linear transmission mechanism (3) is provided with a sliding table (4), the sliding table (4) is provided with a first blocking piece (5) and a second blocking piece (6), the first blocking piece (6) The sheet (5) and the second blocking sheet (6) are located on both sides of the moving direction of the sliding table (4), respectively, and the linear transmission mechanism (3) can drive the sliding table (4) to move so as to make the sliding table (4) move. The first blocking piece (5) and the second blocking piece (6) respectively block and open the corresponding front camera and rear camera. 2 . The single-slide type camera shielding device according to claim 1 , wherein the linear transmission mechanism ( 3 ) comprises a lead screw ( 31 ) and a guide mechanism arranged in parallel with the lead screw ( 31 ). 3 . (32), the sliding table (4) is threadedly connected with the lead screw (31) and is slidably connected with the guide mechanism (32), and the lead screw (31) is driven by the motor (2). 3 . The single-slide type camera blocking device according to claim 2 , wherein the guide mechanism ( 32 ) is a guide rod ( 321 ), and the slide table ( 4 ) is provided with the guide rod ( 321 ). The rod (321) is matched with the first guide hole (43). 4 . The single-slide type camera shielding device according to claim 2 , wherein the bracket ( 1 ) is provided with one end of the screw rod ( 31 ) away from the motor ( 2 ). 5 . The third bearing (101) and the dustproof plate (12) matched with the third bearing (101). 5 . The single-slide type camera shielding device according to claim 1 , wherein the motor ( 2 ) is connected to an external circuit through an FPC board ( 7 ), and the bracket ( 1 ) is upward along the sliding surface. 6 . A plurality of sensors (102) for detecting the position of the sliding table (4) are sequentially arranged in the moving direction of the table (4), and a plurality of sensors (102) are arranged on the sliding table (4). Mating sensor block (44). 6. The single-slide type camera blocking device according to any one of claims 1 to 5, wherein the first blocking piece (5) and the second blocking piece (6) are respectively connected to The sliding table (4) is rotatably connected, and the linear movement of the sliding table (4) can push the first blocking piece (5) and the second blocking piece (6) to rotate to respectively block and open the corresponding front block camera and rear camera. 7. A single-slide type camera shielding device according to claim 6, characterized in that, the sliding table (4) is provided with a first fixed shaft ( 41), the first blocking piece (5) is provided with a first guide chute (51) along the radial direction of the first fixed shaft (41), and the bracket (1) is provided with a A first guide post (11) matched with a guide chute (51), the slide table (4) moves linearly and defines the first guide chute (51) to pass through the first guide post (11). Sliding can make the first blocking plate (5) rotate around the first fixed axis (41) to block and open the corresponding front camera. 8 . The single-slide type camera shielding device according to claim 7 , wherein the first blocking piece ( 5 ) is provided with a first bearing matched with the first fixed shaft ( 41 ). 9 . (52) and a first dust cover (53) matched with the first bearing (52). 9 . The single-slide type camera shielding device according to claim 6 , wherein the sliding table ( 4 ) is provided with a second fixed shaft ( 42), the second blocking piece (6) is provided with a second guide chute (61) along the radial direction of the second fixed shaft (42), the sliding table (4) moves linearly and defines the The second guide chute (61) slides through the external corresponding second guide post, so that the second blocking piece (6) can be rotated around the second fixed axis (42) to block and open the corresponding rear camera. 10 . The single-slide type camera shielding device according to claim 9 , wherein a second bearing matched with the second fixed shaft ( 42 ) is provided on the second blocking piece ( 6 ). 11 . (62) and a second dust cover (63) matched with the second bearing (62).

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