阅读说明：本技术 一种车辆定位装置 (Vehicle positioning device ) 是由 潘晓东 杨成礼 张翔 罗万勇 薛怀 于 2020-12-29 设计创作，主要内容包括：本申请涉及一种车辆定位装置,其包括基座以及设置于基座上用于定位车轮的多组定位组件,所述基座的上端面开设有与定位组件数量相等的定位槽,所述定位槽可供车轮驶入；所述定位组件包括设置于定位槽一端的定位块、滑动连接在基座上的移动板、用于驱动移动板向靠近或远离定位块一侧移动的移动件以及安装在移动板上的车轮固定件,所述车轮固定件包括安装在移动板上的固定油缸、设置在固定油缸活塞杆靠近定位槽一侧的固定板以及连接在固定板远离定位块一端的拨块,所述固定油缸活塞杆的伸缩方向垂直于移动板的运动方向。本申请具有能够提高车辆定位精度的效果。(The application relates to a vehicle positioning device, which comprises a base and a plurality of groups of positioning components arranged on the base and used for positioning wheels, wherein the upper end surface of the base is provided with positioning grooves with the same number as the positioning components, and the positioning grooves can be used for the wheels to drive in; the locating component comprises a locating block arranged at one end of the locating groove, a moving plate which is connected to the base in a sliding mode, a wheel fixing piece which is used for driving the moving plate to move close to or away from one side of the locating block, and a shifting block which is arranged on the moving plate, wherein the wheel fixing piece comprises a fixed oil cylinder arranged on the moving plate, a fixed plate which is arranged on one side of the locating groove and is close to a piston rod of the fixed oil cylinder, and a shifting block which is connected to the fixed plate and is away from one end of the locating. This application has the effect that can improve vehicle positioning accuracy.)

1. A vehicle positioning device characterized by: the wheel positioning device comprises a base (1) and a plurality of groups of positioning assemblies (2) arranged on the base (1) and used for positioning wheels, wherein positioning grooves (112) with the same number as the positioning assemblies (2) are formed in the upper end face of the base (1), and the positioning grooves (112) can be used for driving the wheels; locating component (2) including set up locating piece (21), the moving plate (22) of sliding connection on base (1) of locating slot (112) one end, be used for driving moving plate (22) to being close to or keeping away from moving member (23) of locating piece (21) one side removal and install wheel mounting (24) on moving plate (22), wheel mounting (24) are including installing fixed cylinder (241) on moving plate (22), setting fixed plate (242) and connection shifting block (243) of keeping away from locating piece (21) one end at fixed plate (242) that fixed cylinder (241) piston rod is close to locating slot (112) one side, the direction of motion of the flexible direction perpendicular to moving plate (22) of fixed cylinder (241) piston rod.

2. A vehicle positioning apparatus as defined in claim 1, wherein: locating component (2) still including locating wheel piece (25) of rectifying of locating constant head tank (112) and keeping away from wheel mounting (24) one side, wheel piece (25) of rectifying is including being fixed in rectifying hydro-cylinder (251) on base (1) and fixing at rectifying plate (252) that rectifying hydro-cylinder (251) piston rod is close to constant head tank (112) one side, the flexible direction of rectifying hydro-cylinder (251) piston rod is the same with the flexible direction of fixed hydro-cylinder (241) piston rod, just plate (252) of rectifying is on a parallel with fixed plate (242).

3. A vehicle positioning apparatus as defined in claim 1, wherein: the longitudinal section of the positioning groove (112) is V-shaped.

4. A vehicle positioning apparatus as defined in claim 3, wherein: the groove wall of the positioning groove (112) far away from the positioning block (21) is provided with a guide inclined surface (113) facing to the upper side.

5. A vehicle positioning apparatus as defined in claim 4, wherein: a buffer cushion (211) is fixed on one side of the positioning block (21) close to the guide inclined plane (113).

6. A vehicle positioning apparatus as defined in claim 4, wherein: the bottom wall of the positioning groove (112) is provided with a sliding groove (114) extending along the vertical direction, the bottom end of the positioning block (21) is connected in the sliding groove (114) in a sliding mode, and a driving piece (4) used for driving the positioning block (21) to move longitudinally is arranged on one side of the sliding groove (114).

7. A vehicle positioning apparatus as defined in claim 6, wherein: the driving piece (4) comprises a servo motor (41) arranged on the base (1), a driving gear (42) fixedly connected with an output shaft of the servo motor (41) and a rack (43) meshed with the driving gear (42), and the rack (43) is fixed on one side, away from the guide inclined plane (113), of the positioning block (21).

8. A vehicle positioning apparatus as defined in claim 6, wherein: the top of locating piece (21) articulates there is air spring (5), air spring (5) are located locating piece (21) and keep away from the one side of direction inclined plane (113), just the one end that locating piece (21) were kept away from in air spring (5) articulates on base (1).

9. A vehicle positioning apparatus as defined in claim 1, wherein: the base (1) comprises two movable seats (11) which are identical in structure and detachably connected through at least one group of connecting pieces (3), and the positioning assemblies (2) are even in number and are uniformly arranged on the two movable seats (11).

10. A vehicle positioning apparatus as defined in claim 9, wherein: the connecting piece (3) comprises a connecting block (31) fixed on the side wall of the movable seat (11) and a connecting bolt (32) detachably mounted on the connecting block (31), a connecting groove (111) is formed in the end face, far away from the connecting block (31), of the movable seat (11), and the connecting groove (111) can be used for being embedded into the connecting block (31) on the other movable seat (11); connecting bolt (32) wear to establish on the cell wall of connecting groove (111), seted up on connecting block (31) a plurality ofly with connecting bolt (32) screw-thread fit's connection screw hole (311), a plurality of connection screw hole (311) distribute with the length direction of connecting block (31).

Technical Field

The application relates to the field of vehicle detection, in particular to a vehicle positioning device.

Background

Radiological imaging examinations of vehicles are often required in customs, civil airports, railway systems, etc. to ensure safety. In order to ensure that the vehicle to be detected is within the detected range, the vehicle needs to be positioned before detection.

Among the correlation technique, the location of vehicle generally relies on protrusion in the locating piece realization of vehicle driving surface, travels the vehicle to making wheel and locating piece butt before detecting, and the wheel receives the unable continuation of removal of blockking of locating piece to realize the location of vehicle.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the vehicle is positioned by the mode, the wheels usually bounce for a certain distance after colliding with the positioning blocks due to inertia in the running process of the vehicle, so that the positioning accuracy of the vehicle is reduced and needs to be improved.

Disclosure of Invention

In order to improve the positioning accuracy of vehicle, this application provides a vehicle positioner.

The application provides a vehicle positioner adopts following technical scheme:

a vehicle positioning device comprises a base and a plurality of groups of positioning assemblies which are arranged on the base and used for positioning wheels, wherein the upper end surface of the base is provided with positioning grooves with the same number as the positioning assemblies, and the positioning grooves can be used for the wheels to drive in; the locating component comprises a locating block arranged at one end of the locating groove, a moving plate which is connected to the base in a sliding mode, a wheel fixing piece which is used for driving the moving plate to move close to or away from one side of the locating block, and a shifting block which is arranged on the moving plate, wherein the wheel fixing piece comprises a fixed oil cylinder arranged on the moving plate, a fixed plate which is arranged on one side of the locating groove and is close to a piston rod of the fixed oil cylinder, and a shifting block which is connected to the fixed plate and is away from one end of the locating.

By adopting the technical scheme, when the vehicle is positioned, the wheel is driven into the positioning groove from one side of the positioning groove far away from the positioning block until the wheel abuts against the positioning block. After wheel collision locating piece and a section distance of bounce-back, utilize fixed cylinder drive fixed plate and shifting block to the one side removal that is close to the wheel earlier for the shifting block moves to the wheel and keeps away from one side of locating piece, and the rethread moving member orders about the movable plate and moves to the one side that is close to the locating piece, and the shifting block moves thereupon and can push the wheel to with the locating piece butt, thereby fixes a position the vehicle to the assigned position, and positioning accuracy is high.

Optionally, the locating component is still including locating the wheel piece of rectifying of wheel mounting one side is kept away from to the constant head tank, the wheel piece of rectifying is including being fixed in the hydro-cylinder of rectifying on the base and fixing the board of rectifying that is close to constant head tank one side at the hydro-cylinder piston rod of rectifying, the flexible direction of the hydro-cylinder piston rod of rectifying is the same with the flexible direction of fixed hydro-cylinder piston rod, just the board of rectifying is on a parallel with the fixed plate.

By adopting the technical scheme, the steering wheel controlled manually can be deflected inevitably in the process that a vehicle drives into the base, so that the wheels are deviated. If the wheel runs to the side, far away from the vehicle fixing piece, outside the positioning groove due to deviation, an operator can start the wheel deviation correcting piece, so that the deviation correcting oil cylinder drives the deviation correcting plate to move to the side close to the wheel, and the deviation correcting plate pushes the wheel into the positioning groove. The correction plate can also correct the wheel when pushing the wheel, so that the wheel can be pushed to be abutted against the positioning block when the subsequent wheel fixing piece and the moving piece work, and the positioning precision of the vehicle is further improved.

Optionally, the longitudinal section of the positioning groove is V-shaped.

Through adopting above-mentioned technical scheme, the in-process that the wheel drove into the constant head tank, the diapire of constant head tank slope plays the effect of guide to the wheel, is favorable to the wheel to slide to the constant head tank bottom to improve the location effect of vehicle.

Optionally, a guide inclined surface facing the upper side is arranged on the groove wall of the positioning groove far away from the positioning block.

Through adopting above-mentioned technical scheme, the effect of direction is played when the wheel drives into the constant head tank in the direction inclined plane, has reduced the vibrations that the wheel produced when getting into the constant head tank and has felt, has not only improved driver's comfort level, still plays the effect of protection vehicle chassis.

Optionally, a cushion pad is fixed on one side of the positioning block close to the guide slope.

Through adopting above-mentioned technical scheme, the blotter plays the absorbing effect of buffering when wheel and locating piece collide, can reduce the vibrations that produce when wheel and locating piece collide on the one hand, and on the other hand still plays the effect that the protection locating piece is not bumped up, has prolonged the life of locating piece.

Optionally, a sliding groove extending in the vertical direction is formed in the bottom wall of the positioning groove, the bottom end of the positioning block is slidably connected to the sliding groove, and a driving piece used for driving the positioning block to longitudinally move is arranged on one side of the sliding groove.

Through adopting above-mentioned technical scheme, when not using the locating piece, utilize the driving piece to order about the locating piece and move down to reduce the occupation space of locating piece. When the positioning block is used, the driving piece is utilized to drive the positioning block to move upwards, so that the positioning block protrudes out of the upper end face of the base, and the positioning block plays a role in positioning the wheels.

Optionally, the driving part comprises a servo motor installed on the base, a driving gear fixedly connected with an output shaft of the servo motor and a rack meshed with the driving gear, and the rack is fixed on one side, far away from the guide inclined plane, of the positioning block.

By adopting the technical scheme, when the positioning block is driven to move, the servo motor is started to drive the driving gear to rotate, so that the rack drives the positioning block to longitudinally move, and the height of the positioning block is changed. The rotation direction of operating personnel accessible control servo motor output shaft to change drive gear's rotation direction and locating piece direction of motion, degree of automation is high, easy and simple to handle. The height of the positioning block is adjustable, so that the positioning block can be applied to positioning wheels with different diameters, the application range of the positioning assembly is expanded, and the practicability is high.

Optionally, the top end of the locating piece is hinged with an air spring, the air spring is located on one side, away from the guide inclined plane, of the locating piece, and one end, away from the locating piece, of the air spring is hinged to the base.

Through adopting above-mentioned technical scheme, when the locating piece moved up under the driving piece effect, the piston rod extension of air spring supported the locating piece and kept away from the one side on direction inclined plane, played the effect of auxiliary stay locating piece for the locating piece receives difficult rupture damage after the wheel striking, has prolonged the life of locating piece and the supporting effect to the wheel.

Optionally, the base includes two movable seats that have the same structure and are detachably connected through at least one set of connecting piece, and the positioning assemblies are even in number and are evenly arranged on the two movable seats.

By adopting the technical scheme, the positioning device is generally processed and molded in a factory in advance during production and then is transported to the transfer trolley to be moved to a designated position for installation. The base can be split into two independent sliding seats, has the effect that the transport of being convenient for shifted on the one hand, and operating personnel still can regulate and control the interval of constant head tank on two sliding seats when on the other hand assembles two sliding seats to the vehicle of location wheel interval difference has further improved positioner's application scope and practicality.

Optionally, the connecting piece includes a connecting block fixed on a side wall of the movable seat and a connecting bolt detachably mounted on the connecting block, a connecting groove is formed in an end surface of the movable seat far away from the connecting block, and the connecting groove can be used for the connecting block on another movable seat to be embedded; the connecting bolt penetrates through the groove wall of the connecting groove, a plurality of connecting screw holes in threaded fit with the connecting bolt are formed in the connecting block, and the connecting screw holes are distributed in the length direction of the connecting block.

Through adopting above-mentioned technical scheme, when assembling two sliding seats, in the spread groove of connecting block embedding another sliding seat on one of them sliding seat earlier, pass connecting bolt behind the cell wall of spread groove with one of them connection screw threaded connection to realize the relatively fixed of two sliding seats, easy and simple to handle during the dismouting. When the vehicle of different wheel bases of location, the operating personnel accessible is with the connection screw cooperation of difference on connecting bolt and the connecting block to change the interval of constant head tank on two sliding seats.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when a vehicle is positioned, the wheel is driven into the positioning groove and abutted against the positioning block, after the wheel rebounds, the deviation correcting plate is driven by the deviation correcting oil cylinder to move towards the wheel, the fixed oil cylinder drives the fixed plate to move towards the wheel until the deviation correcting plate and the fixed plate are attached to the wheel, the shifting block is positioned on one side of the wheel away from the positioning block, and then the moving plate is driven by the moving member to move towards the positioning block, so that the shifting block pushes the wheel to abut against the positioning block, and the positioning precision and the positioning effect of the wheel are high;

2. the servo motor can drive the driving gear to rotate, so that the rack and the positioning block can move longitudinally, and wheels with different diameters can be positioned; the gas spring is hinged to one side of the positioning block and plays a role in supporting the positioning block, so that the positioning block is not easy to break and damage;

3. the base can be split into two independent sliding seats, has the effect that the transport of being convenient for shifted on the one hand, and operating personnel still can regulate and control the interval of two constant head tanks when on the other hand is assembled to the vehicle of the different wheel bases of location, the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Fig. 2 is a partial schematic view of an embodiment of the present application.

Fig. 3 is an enlarged schematic view at a in fig. 2.

Description of reference numerals: 1. a base; 11. a movable seat; 111. connecting grooves; 112. positioning a groove; 113. a guide slope; 114. a sliding groove; 115. mounting grooves; 116. a dovetail groove; 117. a notch; 12. a guide table; 2. a positioning assembly; 21. positioning blocks; 211. a cushion pad; 22. moving the plate; 221. a dovetail block; 23. a moving member; 24. a wheel securing member; 241. fixing the oil cylinder; 242. a fixing plate; 243. shifting blocks; 25. a wheel deviation correcting member; 251. a deviation rectifying oil cylinder; 252. a deviation rectifying plate; 3. a connecting member; 31. connecting blocks; 311. a connecting screw hole; 32. a connecting bolt; 4. a drive member; 41. a servo motor; 42. a drive gear; 43. a rack; 5. a gas spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a vehicle positioning device. Referring to fig. 1 and 2, the vehicle positioning device includes a base 1 and two sets of positioning assemblies 2 arranged on the base 1, the base 1 includes two movable seats 11 with the same structure, the two movable seats 11 are detachably connected through three sets of connecting pieces 3, and the two sets of positioning assemblies 2 are respectively arranged on the two movable seats 11 and used for positioning two front wheels or two rear wheels of a vehicle.

Referring to fig. 1, the connecting member 3 includes a connecting block 31 and a connecting bolt 32, the connecting block 31 is fixed on the side wall of the movable seat 11, the movable seat 11 is far away from the end face where the connecting block 31 is disposed, and a connecting groove 111 is disposed, and when the two movable seats 11 are spliced, the connecting groove 111 can be used for the connecting block 31 on another movable seat 11 to be embedded. The connecting bolt 32 is arranged on the upper groove wall of the connecting groove 111 in a penetrating manner, the upper end face of the connecting block 31 is provided with a plurality of connecting screw holes 311, in some embodiments, the number of the connecting screw holes 311 can be four, each connecting screw hole 311 is in threaded fit with the connecting bolt 32, and the connecting screw holes 311 are distributed at equal intervals in the length direction of the connecting block 31.

Referring to fig. 1, when the two movable seats 11 are spliced, the connecting block 31 of one movable seat 11 is embedded into the connecting groove 111 of the other movable seat 11, and then the connecting bolt 32 penetrates through the upper side wall of the connecting groove 111 and is in threaded connection with one of the connecting screw holes 311, so that the two movable seats 11 are limited to move relatively and the splicing is completed, and the operation is simple and convenient; during assembly, an operator can change the overall length of the base 1 by matching the connecting bolts 32 with different connecting screw holes 311, so that the base is suitable for positioning different vehicles.

Referring to fig. 1, a right-angled triangular prism-shaped guide table 12 is fixed on one side of the movable seat 11, the height of the guide table 12 gradually increases from the side far away from the movable seat 11 to the side close to the movable seat 11, and the highest end of the guide table 12 is flush with the upper end face of the movable seat 11. The guide table 12 serves as a guide when the vehicle enters the base 1, and helps the wheel to stably travel onto the base 1.

Referring to fig. 1 and 2, a positioning groove 112 extending horizontally is formed in an upper end surface of the movable seat 11, and the positioning groove 112 is used for a front wheel or a rear wheel of a vehicle to enter. The longitudinal section of the positioning slot 112 is V-shaped, which guides the wheel towards the bottom end thereof after the wheel is driven in, so that the wheel is not easy to move out when the wheel is driven in the positioning slot 112. The groove wall of the positioning groove 112 close to the guide table 12 is provided with a guide slope 113, and the guide slope 113 faces to the upper side and plays a role of guiding when the wheel drives into the positioning groove 112.

Referring to fig. 1 and 2, the positioning assembly 2 includes a positioning block 21, a moving plate 22 slidably connected to the base 1, a moving member 23 located on a side of the moving plate 22 away from the guide table 12, a wheel fixing member 24 mounted on the moving plate 22, and a wheel deviation correcting member 25 mounted on the base 1.

Referring to fig. 2 and 3, a sliding groove 114 extending in the vertical direction is formed in the bottom wall of the positioning groove 112, the sliding groove 114 is located at one end of the positioning groove 112 far away from the guide slope 113, and the bottom of the positioning block 21 is slidably connected in the sliding groove 114. The upper end surface of the movable seat 11 is provided with an installation groove 115 communicated with the sliding groove 114, and the installation groove 115 is provided with a driving part 4.

Referring to fig. 2 and 3, the driving member 4 includes a servo motor 41 mounted on the movable seat 11, a driving gear 42 fixedly connected to an output shaft of the servo motor 41, and a rack 43 engaged with one side of the driving gear 42, the rack 43 is fixed to one side of the positioning block 21 away from the guiding inclined plane 113, and the rack 43 includes a plurality of driven teeth distributed in a vertical direction. When the output shaft of the servo motor 41 rotates, the driving gear 42 will rotate synchronously therewith, so that the rack 43 drives the positioning block 21 to move longitudinally, thereby changing the height of the positioning block 21.

Referring to fig. 2 and 3, before positioning the vehicle, an operator may move the positioning block 21 out of the movable seat 11 by using the driving element 4 to block the wheel from moving further; when the positioning block 21 is not used, an operator can control the output shaft of the servo motor 41 to rotate reversely, so that the positioning block 21 is retracted into the movable seat 11, the occupied space of the positioning block 21 is reduced, and the positioning block 21 is not easily damaged by the impact of a foreign object.

Referring to fig. 2 and 3, a gas spring 5 is connected to one side of the positioning block 21 away from the guide table 12, a cylinder of the gas spring 5 is hinged to the movable seat 11, and a piston rod of the gas spring 5 is hinged to the top end of the positioning block 21, and specifically, the gas spring 5 may be a self-locking gas spring 5. When the positioning block 21 moves up under the action of the driving member 4, the piston rod of the gas spring 5 extends along with the positioning block 21, and the piston rod abuts against one side of the positioning block 21 far away from the guide table 12 to support the positioning block 21.

Referring to fig. 2 and 3, a cushion pad 211 is fixed on the end surface of the positioning block 21 close to the guide table 12, and the cushion pad 211 is made of elastic rubber material, so that when a wheel impacts the positioning block 21, the cushion pad plays a role in buffering and damping, the positioning block 21 is not easily damaged by the wheel, and the service life of the positioning block 21 is prolonged.

Referring to fig. 1 and 2, a dovetail block 221 is fixed to a lower side of the moving plate 22, a horizontally extending dovetail groove 116 is formed in an upper end surface of the movable seat 11, a notch 117 communicating with a side surface of the movable seat 11 is formed in a side wall of the dovetail groove 116, and the dovetail block 221 can move into the dovetail groove 116 along the notch 117 and slide along a length direction of the dovetail groove 116. The moving member 23 includes a moving cylinder fixed on the movable seat 11, the moving cylinder is located on one side of the dovetail groove 116 far away from the guide table 12, a piston rod of the moving cylinder is fixedly connected with the moving plate 22, and a telescopic direction of the piston rod of the moving cylinder is parallel to an extending direction of the positioning groove 112, and is used for driving the moving plate 22 to move towards a direction close to or far away from the positioning block 21.

Referring to fig. 1 and 2, the wheel fixing member 24 includes a fixed cylinder 241 mounted on the moving plate 22, a fixed plate 242 fixedly connected to a piston rod of the fixed cylinder 241, and a shifting block 243 fixedly connected to one end of the fixed plate 242 away from the positioning block 21, wherein the piston rod of the fixed cylinder 241 is disposed toward the positioning slot 112 along a horizontal direction, and a telescopic direction of the piston rod of the fixed cylinder 241 is perpendicular to an extending direction of the positioning slot 112. The fixing plate 242 is located on one side of the fixing cylinder 241 close to the positioning slot 112, and the length direction of the fixing plate 242 is parallel to the extending direction of the positioning slot 112. When the piston rod of the fixing cylinder 241 extends, the fixing plate 242 and the moving block 243 move toward the positioning slot 112, so that the moving block 243 moves to a side of the positioning slot 112 away from the positioning block 21.

Referring to fig. 1 and 2, the wheel deviation correcting member 25 includes a deviation correcting cylinder 251 and a deviation correcting plate 252, the deviation correcting cylinder 251 is fixed on the movable seat 11, a piston rod of the deviation correcting cylinder 251 is fixedly connected to the deviation correcting plate 252, a telescopic direction of the piston rod of the deviation correcting cylinder 251 is parallel to a telescopic direction of the piston rod of the fixed cylinder 241, and the deviation correcting plate 252 and the fixed plate 242 are respectively disposed on two sides of the positioning slot 112 and are parallel to each other. The deviation rectifying cylinder 251 is used for driving the deviation rectifying plate 252 to move towards the direction close to or away from the positioning groove 112, when the wheel drives to the position between the deviation rectifying plate 252 and the positioning groove 112, the deviation rectifying plate 252 can push the wheel into the positioning groove 112 under the action of the deviation rectifying cylinder 251, and the wheel is rectified in the pushing process.

The implementation principle of the vehicle positioning device in the embodiment of the application is as follows: when the vehicle is positioned, the servo motor 41 drives the driving gear 42 to rotate, so that the top end of the positioning block 21 moves out of the movable seat 11, and the gas spring 5 is supported on one side of the positioning block 21 far away from the guide table 12. Two front wheels or two rear wheels of the vehicle respectively drive into the two positioning grooves 112, after the wheels collide with the positioning blocks 21 and rebound, the fixed oil cylinder 241 is firstly synchronously utilized to enable the fixed plate 242 to move towards the wheels, the deviation-correcting oil cylinder 251 enables the deviation-correcting plate 252 to move towards the wheels, the wheels are straightened, the shifting block 243 moves to one side of the wheels far away from the positioning blocks 21, the moving oil cylinder is then utilized to drive the moving plate 22 to move towards one side close to the positioning blocks 21, and the shifting block 243 pushes the wheels to abut against the positioning blocks 21, so that the positioning accuracy of the wheels is improved, and the positioning effect is good.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.