Tyre drum tyre forming machine and tyre drum transmission box transmission mechanism thereof

文档序号:1223818 发布日期:2020-09-08 浏览:24次 中文

阅读说明:本技术 胎体鼓轮胎成型机及其胎体鼓传动箱传动机构 (Tyre drum tyre forming machine and tyre drum transmission box transmission mechanism thereof ) 是由 张瑞华 陆永高 颜建龙 杨晓 周志伟 丁建华 孙振 于 2020-06-18 设计创作,主要内容包括:本发明公开了胎体鼓轮胎成型机及其胎体鼓传动箱传动机构,该胎体鼓传动箱传动机构包括差速器和减速机;差速器安装有外壳制动组件,差速器输入轴与差速器输出轴的速比为1:1,减速机输入端与减速机输出轴的速比为1:1,减速机输入端与减速机输出轴反向旋转;差速器输出轴连接减速机输入端,减速机输出轴通过第一啮合传动组件传动连接主轴,第一啮合传动组件安装有阻止减速机输出轴转动的第一制动部件;伺服电机驱动连接差速器输入轴,差速机输入轴通过第二啮合传动组件传动连接芯轴;第一啮合传动组件的传动比与第二啮合传动组件的传动比相等。该传动机构避免了使用离合器连接胎体鼓的芯轴和主轴所存在的潜在失效模式。(The invention discloses a tire body drum tire forming machine and a transmission mechanism of a transmission box of the tire body drum, wherein the transmission mechanism of the transmission box of the tire body drum comprises a differential mechanism and a speed reducer; the differential is provided with a shell brake assembly, the speed ratio of an input shaft of the differential to an output shaft of the differential is 1:1, the speed ratio of an input end of the speed reducer to an output shaft of the speed reducer is 1:1, and the input end of the speed reducer and the output shaft of the speed reducer rotate reversely; the output shaft of the differential is connected with the input end of a speed reducer, the output shaft of the speed reducer is in transmission connection with a main shaft through a first meshing transmission assembly, and the first meshing transmission assembly is provided with a first braking component for preventing the output shaft of the speed reducer from rotating; the servo motor is in driving connection with an input shaft of the differential mechanism, and the input shaft of the differential mechanism is in driving connection with the mandrel through the second meshing transmission assembly; the transmission ratio of the first meshing transmission assembly is equal to that of the second meshing transmission assembly. The transmission mechanism avoids potential failure modes that exist when a clutch is used to connect the spindle of the carcass drum with the main shaft.)

1. A transmission mechanism of a carcass drum transmission case is used for the transmission connection of a servo motor of the transmission case with a main shaft and a mandrel of the carcass drum, and is characterized by comprising a differential mechanism and a speed reducer; the differential mechanism is provided with a shell brake assembly, when the shell brake assembly is in a brake state to lock a shell of the differential mechanism, a differential mechanism input shaft and a differential mechanism output shaft rotate in opposite directions, the speed ratio of the differential mechanism input shaft to the differential mechanism output shaft is 1:1, and when the shell brake assembly releases the shell of the differential mechanism, the transmission between the differential mechanism input shaft and the differential mechanism output shaft is released; the speed ratio of the input end of the speed reducer to the output shaft of the speed reducer is 1:1, and the input end of the speed reducer and the output shaft of the speed reducer rotate reversely;

the differential output shaft is in transmission connection with the input end of the speed reducer and synchronously rotates, the output shaft of the speed reducer is in transmission connection with the main shaft through a first meshing transmission assembly so as to drive the main shaft to rotate, and the first meshing transmission assembly is provided with a first braking component for preventing the output shaft of the speed reducer from rotating;

the servo motor is in driving connection with the differential input shaft so as to drive the differential input shaft to rotate, and the differential input shaft is in driving connection with the mandrel through a second meshing transmission assembly so as to drive the mandrel to rotate; the transmission ratio of the first meshing transmission assembly is equal to that of the second meshing transmission assembly.

2. The carcass drum transmission mechanism as claimed in claim 1, wherein said first engagement transmission assembly comprises a first driving pulley connected to and coaxially disposed with said reducer output shaft, a first driven pulley connected to and coaxially disposed with said main shaft, and a first timing belt drivingly connecting said first driving pulley and first driven pulley; the second meshing transmission assembly comprises a second driving belt wheel which is connected with the differential machine input shaft and is coaxially arranged with the differential machine input shaft central axis, a second driven belt wheel which is connected with the mandrel and is coaxially arranged with the mandrel central axis, and a second synchronous belt which is in transmission connection with the second driving belt wheel and the second driven belt wheel.

3. The carcass drum transmission as in claim 2, wherein the first driving pulley and the second driving pulley have the same number of teeth and the first driven pulley and the second driven pulley have the same number of teeth.

4. The carcass drum transmission case transmission mechanism according to claim 2, wherein the first engagement transmission assembly includes a transmission shaft connected to the output shaft of the speed reducer through a coupling, the transmission shaft is coaxially disposed with the central axis of the output shaft of the speed reducer, the first driving pulley is sleeved and fixed on the transmission shaft, a transmission shaft bearing seat of the transmission shaft is fixedly mounted on a frame or a housing of the transmission case, and the first brake component includes an electromagnetic brake mounted on the transmission shaft.

5. The carcass drum transmission mechanism as claimed in claim 2, wherein the second engagement transmission assembly comprises a torque clutch connected with the second driven pulley through a transition disc, the torque clutch being connected with the spindle.

6. The carcass drum transmission as claimed in claim 2, wherein the drive shaft of the servo motor is connected to the differential input shaft through a third engagement transmission assembly; the third meshing transmission assembly comprises a third driven belt wheel, a third driving belt wheel and a third synchronous belt, wherein the third driven belt wheel is connected with the differential input shaft and is coaxially arranged with the differential input shaft, the third driving belt wheel is connected with the driving shaft and is coaxially arranged with the driving shaft, and the third synchronous belt is in transmission connection with the third driving belt wheel and the third driven belt wheel.

7. The carcass drum transmission mechanism of claim 6, wherein the third intermeshing drive assembly further comprises a differential input shaft bearing block fitted to the differential input shaft, the differential input shaft bearing block being fixedly mounted on a frame or housing of the transmission; the second driving belt wheel and the third driven belt wheel are respectively arranged on two sides of a bearing seat of the input shaft of the differential mechanism, and the second driving belt wheel is arranged on one side of the shell close to the differential mechanism.

8. The carcass drum transmission as in claim 1, wherein the housing brake assembly comprises a brake disc mounted on the housing of the differential, and a butterfly air brake acting on the brake disc.

9. The carcass drum transmission as in claim 1, wherein the differential includes a differential output shaft, a differential input shaft, a driven gear, a transfer gear with a mounting shaft, a drive gear, and a housing with a brake disc; the central axes of the differential output shaft, the differential input shaft, the driven gear, the driving gear and the brake disc are arranged in a collinear manner, and the central axis of a mounting shaft of the transfer gear is perpendicular to the central axis of the differential input shaft; the driven gear, the driving gear and the differential input shaft are all arranged in the shell, the differential output shaft and the differential input shaft are all inserted into the shell, and the differential output shaft, the differential input shaft and the mounting shaft of the transfer gear are all connected with the shell through bearings; the differential output shaft with driven gear key-type connection, the differential input shaft with driving gear key-type connection, driving gear and driven gear set up respectively transfer gear both sides, just driving gear and driven gear all with transfer gear meshing.

10. A carcass drum tyre building machine comprising a carcass drum provided with a main shaft and a spindle and a transmission box comprising a servo motor, characterized in that the drive shaft of the servo motor drivingly connects the main shaft and the spindle by a carcass drum transmission box transmission mechanism as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of tire forming equipment, in particular to a tire body drum tire forming machine and a transmission mechanism of a tire body drum transmission box thereof.

Background

In the existing tire body drum tire forming machine, a transmission box of a tire body drum mostly adopts a servo motor to drive a spindle and a mandrel of the tire body drum to rotate simultaneously, in order to realize the driving mode, the spindle and the mandrel of the tire body drum need to be connected through a clutch, and the servo motor can drive the mandrel to rotate independently or synchronously by controlling the opening and closing state of the clutch.

However, the open-close state of the clutch cannot be determined by external detection, and a common clutch, for example, a tooth-to-tooth phenomenon occurs occasionally when a tooth-mesh clutch is closed, and errors may be accumulated after long-term use; the friction plate clutch may have relative slip phenomenon, and may seriously result in the scrapping of the tire casing drum. And the failure mode of the clutch can not be effectively avoided by means of external detection and the like, so that equipment failure is easily caused by directly connecting the main shaft and the mandrel of the carcass drum by adopting the clutch in the tire forming machine, and the normal production and use are influenced.

Disclosure of Invention

The invention provides a tire body drum tire forming machine and a tire body drum transmission box transmission mechanism thereof, aiming at the defects of the prior art, the tire body drum transmission box transmission mechanism avoids the potential failure mode existing when a clutch is used for connecting a mandrel of a tire body drum and a main shaft, and can adopt one servo motor to simultaneously realize the rotation control of the main shaft of the tire body drum and the mandrel, thereby reducing equipment faults.

In order to achieve the purpose, the invention adopts the technical scheme that:

a transmission mechanism of a carcass drum transmission case is used for the transmission connection of a servo motor of the transmission case with a main shaft and a mandrel of the carcass drum and comprises a differential mechanism and a speed reducer; the differential mechanism is provided with a shell brake assembly, when the shell brake assembly is in a brake state to lock a shell of the differential mechanism, a differential mechanism input shaft and a differential mechanism output shaft rotate in opposite directions, the speed ratio of the differential mechanism input shaft to the differential mechanism output shaft is 1:1, and when the shell brake assembly releases the shell of the differential mechanism, the transmission between the differential mechanism input shaft and the differential mechanism output shaft is released; the speed ratio of the input end of the speed reducer to the output shaft of the speed reducer is 1:1, and the input end of the speed reducer and the output shaft of the speed reducer rotate reversely;

the differential output shaft is in transmission connection with the input end of the speed reducer and synchronously rotates, the output shaft of the speed reducer is in transmission connection with the main shaft through a first meshing transmission assembly so as to drive the main shaft to rotate, and the first meshing transmission assembly is provided with a first braking component for preventing the output shaft of the speed reducer from rotating;

the servo motor is in driving connection with the differential input shaft so as to drive the differential input shaft to rotate, and the differential input shaft is in driving connection with the mandrel through a second meshing transmission assembly so as to drive the mandrel to rotate; the transmission ratio of the first meshing transmission assembly is equal to that of the second meshing transmission assembly.

Preferably, the first meshing transmission assembly comprises a first driving belt wheel, a first driven belt wheel and a first synchronous belt, wherein the first driving belt wheel is connected with the output shaft of the speed reducer and is coaxially arranged with the output shaft of the speed reducer, the first driven belt wheel is connected with the main shaft and is coaxially arranged with the main shaft, and the first synchronous belt is in transmission connection with the first driving belt wheel and the first driven belt wheel; the second meshing transmission assembly comprises a second driving belt wheel, a second driven belt wheel and a second synchronous belt, wherein the second driving belt wheel is connected with the input shaft of the differential mechanism and is coaxially arranged with the central axis of the input shaft of the differential mechanism; the transmission ratio of the first driving belt wheel and the first driven belt wheel is equal to that of the second driving belt wheel and the second driven belt wheel.

Preferably, the first driving pulley and the second driving pulley have the same number of teeth, and the first driven pulley and the second driven pulley have the same number of teeth.

Preferably, the first meshing transmission assembly comprises a transmission shaft connected with the output shaft of the speed reducer through a coupler, the transmission shaft is coaxial with the central axis of the output shaft of the speed reducer, the first driving pulley is sleeved and fixed on the transmission shaft, a transmission shaft bearing seat of the transmission shaft is fixedly installed on a rack or a shell of the transmission case, and the first braking component comprises an electromagnetic brake installed on the transmission shaft.

Preferably, the second geared drive assembly includes a torque clutch connected to the second driven pulley through a transition plate, the torque clutch being connected to the spindle.

Preferably, a drive shaft of the servo motor is connected with the differential input shaft through a third meshing transmission assembly; the third meshing transmission assembly comprises a third driven belt wheel, a third driving belt wheel and a third synchronous belt, wherein the third driven belt wheel is connected with the differential input shaft and is coaxially arranged with the differential input shaft, the third driving belt wheel is connected with the driving shaft and is coaxially arranged with the driving shaft, and the third synchronous belt is in transmission connection with the third driving belt wheel and the third driven belt wheel.

Preferably, the third meshing transmission assembly further comprises a differential input shaft bearing seat matched with the differential input shaft, and the differential input shaft bearing seat is fixedly arranged on a frame or a shell of the transmission case; the second driving belt wheel and the third driven belt wheel are respectively arranged on two sides of a bearing seat of the input shaft of the differential mechanism, and the second driving belt wheel is arranged on one side of the shell close to the differential mechanism.

Preferably, the housing brake assembly includes a brake disc mounted on the housing of the differential, and a butterfly air brake acting on the brake disc.

Preferably, the differential comprises a differential output shaft, a differential input shaft, a driven gear, a transfer gear with a mounting shaft, a driving gear and a housing with a brake disc; the central axes of the differential output shaft, the differential input shaft, the driven gear, the driving gear and the brake disc are arranged in a collinear manner, and the central axis of a mounting shaft of the transfer gear is perpendicular to the central axis of the differential input shaft; the driven gear, the driving gear and the differential input shaft are all arranged in the shell, the differential output shaft and the differential input shaft are all inserted into the shell, and the differential output shaft, the differential input shaft and the mounting shaft of the transfer gear are all connected with the shell through bearings; the differential output shaft with driven gear key-type connection, the differential input shaft with driving gear key-type connection, driving gear and driven gear set up respectively transfer gear both sides, just driving gear and driven gear all with transfer gear meshing.

The invention also discloses a tire body drum wheel tire forming machine which comprises a tire body drum and a transmission box, wherein the tire body drum is provided with a main shaft and a mandrel, the transmission box comprises a servo motor, and a driving shaft of the servo motor is in transmission connection with the main shaft and the mandrel through a transmission mechanism of the tire body drum transmission box.

Compared with the prior art, the invention has the beneficial effects that: the transmission mechanism of the carcass drum transmission box avoids a potential failure mode existing when a clutch is used for connecting a mandrel of the carcass drum and a main shaft, can simultaneously realize rotation control of the main shaft of the carcass drum and the mandrel by adopting one servo motor, and reduces equipment faults.

Drawings

FIG. 1 is a schematic structural view of the carcass drum transmission mechanism of the embodiment;

fig. 2 is a schematic structural view of the differential of the present embodiment.

Detailed Description

The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, a transmission mechanism of a carcass drum transmission case is used for the transmission connection of a servo motor 1 of the transmission case and a main shaft 21 and a mandrel 16 of the carcass drum, and comprises a differential 9 and a speed reducer 10; the differential mechanism 9 is provided with a shell brake assembly, when the shell brake assembly is in a brake state to lock a shell of the differential mechanism 9, a differential mechanism input shaft and a differential mechanism output shaft rotate in opposite directions, the speed ratio of the differential mechanism input shaft to the differential mechanism output shaft is 1:1, and when the shell brake assembly releases the shell of the differential mechanism, the transmission between the differential mechanism input shaft and the differential mechanism output shaft is released; the speed ratio of the input end of the speed reducer to the output shaft of the speed reducer is 1:1, and the input end of the speed reducer and the output shaft of the speed reducer rotate reversely;

the differential output shaft is in transmission connection with the input end of the speed reducer and synchronously rotates, the output shaft of the speed reducer is in transmission connection with the main shaft 21 through a first meshing transmission assembly so as to drive the main shaft 21 to rotate, and the first meshing transmission assembly is provided with a first braking component for preventing the output shaft of the speed reducer from rotating;

the servo motor 1 is in driving connection with the differential input shaft so as to drive the differential input shaft to rotate, and the differential input shaft is in driving connection with the mandrel 16 through a second meshing transmission assembly so as to drive the mandrel to rotate; the transmission ratio of the first meshing transmission assembly is equal to that of the second meshing transmission assembly.

The utility model provides a matrix drum tire make-up machine, includes matrix drum and transmission case, the matrix drum is equipped with main shaft 21 and dabber 16, the transmission case includes servo motor 1, servo motor 1's drive shaft pass through matrix drum transmission case drive mechanism transmission connection main shaft 21 and dabber 16.

The working process of the transmission mechanism of the carcass drum transmission case can be briefly described as follows:

when glue materials are attached, a shell brake assembly is in a brake state, a shell of a differential mechanism 9 is locked, a first brake component is in a release state, at the moment, a servo motor 1 drives a differential mechanism input shaft to rotate, the differential mechanism input shaft drives a mandrel 16 in transmission connection with the differential mechanism input shaft to rotate together through a second meshing transmission assembly, as the shell of the differential mechanism 9 is locked, a differential mechanism output shaft and the differential mechanism input shaft rotate in opposite directions, the speed ratio of the differential mechanism input shaft to the differential mechanism output shaft is 1:1, the speed of the differential mechanism output shaft is the same as that of the differential mechanism input shaft, the direction is changed through a speed reducer 10, the speed reducer output shaft and the differential mechanism input shaft rotate in the same direction and have the same speed, the speed reducer output shaft drives a main shaft 21 in transmission connection with the reducer output shaft to rotate together through the first meshing transmission assembly, and as that of the first, the main shaft 21 and the mandrel 16 of the carcass drum can realize synchronous rotation, so that the gluing of the sizing material is realized;

when the tire body drum expands and contracts, the shell brake assembly is in a release state, and the shell of the differential mechanism 9 is released; the first brake component is in a brake state, the output shaft of the speed reducer is locked, so that the differential output shaft and the main shaft 21 which are in transmission connection with the differential output shaft are also in a brake state, the servo motor 1 drives the differential input shaft to rotate, the differential input shaft drives the mandrel 16 which is in transmission connection with the differential input shaft to rotate together through the second meshing transmission assembly, the mandrel 16 rotates independently, and further the expansion and contraction of the tire body drum are achieved.

According to the structure and the working process of the transmission mechanism of the carcass drum transmission case, the transmission mechanism of the carcass drum transmission case avoids a potential failure mode existing when a clutch is used for connecting a mandrel of the carcass drum and a main shaft, and can adopt one servo motor to simultaneously realize the rotation control of the main shaft and the mandrel of the carcass drum, thereby reducing equipment faults.

Specifically, the first meshing transmission assembly comprises a first driving belt wheel 13 which is connected with the output shaft of the speed reducer and is coaxially arranged with the output shaft of the speed reducer, a first driven belt wheel 19 which is connected with the main shaft 21 and is coaxially arranged with the main shaft 21, and a first synchronous belt 12 which is in transmission connection with the first driving belt wheel 13 and the first driven belt wheel 19; the second meshing transmission assembly comprises a second driving belt wheel 7 which is connected with the input shaft of the differential mechanism and is coaxially arranged with the central axis of the input shaft of the differential mechanism, a second driven belt wheel 18 which is connected with the mandrel 16 and is coaxially arranged with the central axis of the mandrel 16, and a second synchronous belt 6 which is in transmission connection with the second driving belt wheel 7 and the second driven belt wheel 18; the transmission ratio of the first driving pulley 13 and the first driven pulley 19 is equal to the transmission ratio of the second driving pulley 7 and the second driven pulley 18.

Specifically, the first driving pulley 13 and the second driving pulley 7 have the same number of teeth, and the first driven pulley 19 and the second driven pulley 18 have the same number of teeth.

Specifically, first meshing transmission assembly include through shaft coupling 11 with transmission shaft 20 of speed reducer output shaft, transmission shaft 20 with speed reducer output shaft axis coaxial setting, first driving pulley 13 cover is established and is fixed in on the transmission shaft 20, transmission shaft bearing frame 22 fixed mounting of transmission shaft 20 is in on the frame or the casing of transmission case.

Specifically, the first brake component includes an electromagnetic brake 14 mounted on the transmission shaft 20. The electromagnetic brake can realize the brake control of the transmission shaft 20, and further realize the brake control of the output shaft of the speed reducer and the first driving belt wheel 13 which are connected with the transmission shaft 20 and the output shaft of the differential mechanism.

The first brake member may be any brake structure capable of braking control of the reducer output shaft, in addition to the electromagnetic brake described above, and may be attached to the transmission shaft 20, the main shaft 21, the reducer output shaft, or the differential output shaft.

Specifically, the second meshing transmission assembly comprises a torque clutch 15 connected with the second driven pulley 18 through a transition disc 17, and the torque clutch 15 is connected with the mandrel 16.

Specifically, a driving shaft of the servo motor 1 is connected with the differential input shaft through a third meshing transmission assembly; the third meshing transmission assembly comprises a third driven belt wheel 4 which is connected with the differential input shaft and is coaxially arranged with the differential input shaft, a third driving belt wheel 2 which is connected with the driving shaft and is coaxially arranged with the driving shaft, and a third synchronous belt 3 which is in transmission connection with the third driving belt wheel 2 and the third driven belt wheel 4.

Specifically, the third meshing transmission assembly further comprises a differential input shaft bearing seat 5 matched with the differential input shaft, and the differential input shaft bearing seat 5 is fixedly installed on a rack or a shell of the transmission case; the second driving belt wheel 7 and the third driven belt wheel 4 are respectively arranged on two sides of the differential input shaft bearing seat 5, and the second driving belt wheel 7 is arranged on one side of the shell close to the differential 9.

Specifically, the differential mechanism 9 may adopt any existing differential mechanism structure that can realize that when the housing of the differential mechanism 9 is in a braking state, the differential mechanism input shaft is in transmission connection with the differential mechanism output shaft and rotates reversely, and when the housing of the differential mechanism 9 is not braked, the differential mechanism input shaft is released from transmission connection with the differential mechanism output shaft. For example, as shown in fig. 2, the differential 9 includes a differential output shaft 91, a differential input shaft 96, a driven gear 93, a transfer gear 94 with a mounting shaft, a drive gear 95, and a housing 92 with a brake disk 921; the central axes of the differential output shaft 91, the differential input shaft 96, the driven gear 93, the driving gear 95 and the brake disc 921 are arranged in a collinear way, and the central axis of the mounting shaft of the transfer gear 94 is perpendicular to the central axis of the differential input shaft 96; the driven gear 93, the driving gear 95 and the differential input shaft 96 are all mounted in the housing, the differential output shaft 91 and the differential input shaft 96 are all inserted into the housing 92, and the mounting shafts of the differential output shaft 91, the differential input shaft 96 and the transfer gear 94 are all connected with the housing through bearings; the differential output shaft 91 is in key connection with the driven gear 93, the differential input shaft 96 is in key connection with the driving gear 95, the driving gear 95 and the driven gear 93 are respectively arranged on two sides of the transfer gear 94, and the driving gear 95 and the driven gear 93 are both meshed with the transfer gear 94. The differential mechanism adopts the structure, when glue materials are attached, the shell 92 with the brake disc 921 is locked, the driven gear 93 connected with the differential mechanism output shaft 91 is not locked by the first brake component, under the state, the transfer gear 94 is integrally locked around the central axis of the differential mechanism output shaft 91 and the differential mechanism input shaft 96, the transfer gear 94 can only rotate around the central axis of the self-mounted shaft, and the differential mechanism input shaft 96 can drive the differential mechanism output shaft 91 to reversely rotate through the transfer gear 94; when the tire body drum expands and contracts, the outer shell 92 with the brake disc 921 is released, the driven gear 93 connected with the differential output shaft 91 is locked by the first brake component, the differential input shaft 96 drives the transfer gear 94 to move, and the transfer gear 93 drives the outer shell 92 to rotate around the differential output shaft 91 and the central axis of the differential input shaft 96 due to the fact that one side of the driven gear 93 is locked, and the differential input shaft 96 rotates at the moment without driving the differential output shaft 91 to rotate.

Specifically, the housing brake assembly includes a brake disc mounted on the housing of the differential 9, and a butterfly type pneumatic brake 8 acting on the brake disc. Besides the butterfly air brake 8, the shell brake component can also adopt any brake structure capable of realizing shell braking of the differential mechanism 9.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

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