Winding structure wall pipe socket cutting device and method

文档序号:1824851 发布日期:2021-11-12 浏览:19次 中文

阅读说明:本技术 一种缠绕结构壁管插口切削装置及方法 (Winding structure wall pipe socket cutting device and method ) 是由 周茂振 赵忠磊 于 2021-08-18 设计创作,主要内容包括:本发明涉及一种缠绕结构壁管插口切削装置及方法,包括:承托机构:用于驱动待加工缠绕结构壁管及其内部的模具转动;旋转支架:设有切削机构,旋转支架一端与固定设置的转轴转动连接以使得切削机构能够朝向待加工缠绕结构壁管运动,旋转支架与转动驱动件连接;还包括固定在旋转支架的壳体,壳体内转动连接限位件,限位件与驱动机构连接,限位件螺纹连接有限位丝杠,限位丝杠与壳体滑动连接,限位丝杠的端部能够与模具伸出至缠绕结构壁管插口端外部的部分接触,采用本发明的切削装置降低了劳动强度,保证了制品的精度。(The invention relates to a winding structure wall pipe socket cutting device and a method, comprising the following steps: the supporting mechanism: the device is used for driving the wall pipe of the winding structure to be processed and the mould inside the wall pipe to rotate; rotating the support: the cutting machine is provided with a cutting mechanism, one end of a rotating bracket is rotationally connected with a rotating shaft which is fixedly arranged so that the cutting mechanism can move towards a wall pipe of a winding structure to be processed, and the rotating bracket is connected with a rotating driving piece; the cutting device also comprises a shell fixed on the rotating support, the shell is rotatably connected with a limiting part, the limiting part is connected with the driving mechanism, the limiting part is in threaded connection with a limiting lead screw, the limiting lead screw is in sliding connection with the shell, and the end part of the limiting lead screw can be in contact with the part of the mold extending out of the socket end of the wall pipe of the winding structure.)

1. A wound structured wall tube spigot cutting apparatus comprising:

the supporting mechanism: the device is used for driving the wall pipe of the winding structure to be processed and the mould inside the wall pipe to rotate;

rotating the support: the cutting machine is provided with a cutting mechanism, one end of a rotating bracket is rotationally connected with a rotating shaft which is fixedly arranged so that the cutting mechanism can move towards a wall pipe of a winding structure to be processed, and the rotating bracket is connected with a rotating driving piece;

the device is characterized by further comprising a shell fixed on the rotating support, the shell is internally rotatably connected with a limiting part, the limiting part is connected with a driving mechanism, the limiting part is in threaded connection with a limiting lead screw, the limiting lead screw is in sliding connection with the shell, and the end part of the limiting lead screw can be in contact with the part of the mold extending out of the socket end of the winding structure wall pipe.

2. The winding structure wall pipe socket cutting device according to claim 1, wherein the driving mechanism comprises a driving member fixed to the housing, an output shaft of the driving member is connected to the position limiting member through a gear transmission mechanism, and the position limiting member can be driven to rotate through the gear transmission mechanism.

3. The winding structure wall pipe socket cutting device according to claim 1, wherein the limit lead screw is provided with a key groove arranged along an axial direction of the limit lead screw, the housing is fixed with a guide key, the guide key is embedded in the key groove, and the length of the key groove is greater than that of the guide key so as to realize the sliding connection of the limit lead screw and the housing.

4. The winding structure wall pipe socket cutting device according to claim 1, wherein the end portion of the limit screw rod extending to the outside of the housing is provided with a limit bearing, and the limit screw rod is in contact with the portion of the mold extending to the outside of the winding structure wall pipe socket end through the limit bearing.

5. The socket cutting device for the winding structure wall pipe according to claim 1, wherein one end of the limit screw is used for contacting with the mold, the other end of the limit screw is fixed with a position detection block located outside the housing, the housing is fixed with a first proximity switch and a second proximity switch through a mounting plate, the first proximity switch can send a stop signal when the limit screw extends out of the housing until the position detection block reaches a set distance with the first proximity switch, and the second proximity switch can send a stop signal when the limit screw is retracted into the housing until the position detection block reaches a set distance with the second proximity switch.

6. A winding structure wall pipe socket cutting device according to claim 5, wherein the mounting plate is further fixed with a first limit switch and a second limit switch for limiting the maximum distance that the limit screw extends out of and retracts into the housing, respectively.

7. A winding structure wall pipe socket cutting device according to claim 6, wherein the end of the limit screw rod located inside the housing is fixed with a connecting screw rod, the connecting screw rod extends to the outside of the housing and is fixed with a position detection block, and the position detection block can be contacted with the first limit switch and the second limit switch.

8. The winding structure wall pipe socket cutting device according to claim 1, wherein the rotating shaft is further provided with a fixed support capable of moving along the axial direction of the winding structure wall pipe to be processed, the fixed support is in contact with the rotating support, and the fixed support can drive the rotating support to move along the axial direction of the winding structure wall pipe to be processed.

9. The winding structure wall pipe socket cutting device according to claim 1, wherein the rotary driving member is a cylinder, a cylinder body of the cylinder is hinged with the fixed support, and a piston rod of the cylinder is hinged with the rotary support.

10. A method of operating a wound structured wall pipe spigot cutting apparatus as claimed in any one of claims 1 to 9, it is characterized in that the limit screw rod extends out of the shell by a first set distance, so that the rotary driving piece drives the rotary bracket to rotate around the rotating shaft until the end part of the limit screw rod contacts with the part of the mould extending out of the spigot end of the wall pipe of the winding structure to be processed, the cutting mechanism has a second set distance with the wall pipe of the winding structure to be processed, the cutting mechanism is started, the driving mechanism drives the limiting screw rod to move through the limiting part, when the limiting screw rod is retracted into the shell, the driving piece is rotated to drive the rotating bracket to move, the cutting mechanism moves towards the wall pipe of the winding structure to be processed, and cutting the socket end of the wall pipe with the winding structure to be processed, stopping the driving mechanism after the socket end of the wall pipe with the winding structure to be cut reaches a set size, and driving the rotary bracket to rotate and reset by the telescopic piece.

Technical Field

The invention relates to the technical field of machining equipment, in particular to a winding structure wall pipe socket cutting device and method.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

As shown in figure 1, when the wall pipe with the winding structure is produced, a socket 1 and a socket 2 structure for connection are needed to be manufactured at two ends, the inner size of the socket is determined by a steel roller die, the outer size of the socket needs to be provided with enough allowance during winding forming, and when winding is finished, a cutter is used for machining the outer size of the socket and the inner size of the socket.

The main method at present is to make a cutting frame capable of moving on a winding cross bar, and a cutting knife arranged on the cutting frame is used for cutting a socket of a winding structure wall pipe.

The inventors have found that the prior art has problems and disadvantages: if the cutting frame pushes the cutter directly against the pipe wall, the motor is blocked due to too much cutter consumption. Present winding arrangement wall pipe socket cutting device is for avoiding holding back the dead motor, as shown in fig. 2, installed a stopper 3 on the cutting frame, connect a lead screw 4 on the stopper, make cylinder extension length receive the restriction, then slow rotation hand wheel 5 makes the cylinder slowly stretch out, the cutter is gradual near the mould direction, slow increase amount of eating, the rotation hand wheel that needs operating personnel to stop, the hand wheel rotates 1 circle, the amount of eating just increases the multiple of pitch, such operation is too loaded down with trivial details.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides the winding structure wall pipe socket cutting device, which reduces the labor intensity of workers and improves the automation degree of equipment; the cutting depth is not required to be manually measured, and the precision of the product is improved through automatic control of equipment.

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

in a first aspect, embodiments of the present invention provide a winding structure wall pipe socket cutting apparatus, including:

the supporting mechanism: the device is used for driving the wall pipe of the winding structure to be processed and the mould inside the wall pipe to rotate;

rotating the support: the cutting machine is provided with a cutting mechanism, one end of a rotating bracket is rotationally connected with a rotating shaft which is fixedly arranged so that the cutting mechanism can move towards a wall pipe of a winding structure to be processed, and the rotating bracket is connected with a rotating driving piece;

the winding structure wall pipe socket is characterized by further comprising a shell fixed on the rotating support, the shell is internally rotatably connected with a limiting part, the limiting part is connected with a driving mechanism, the limiting part is in threaded connection with a limiting lead screw, the limiting lead screw is in sliding connection with the shell, and the end part of the limiting lead screw can be in contact with the part of the mold extending out of the socket end of the winding structure wall pipe socket.

Optionally, the driving mechanism includes a driving member fixed to the housing, an output shaft of the driving member is connected to the limiting member through a gear transmission mechanism, and the limiting member can be driven to rotate through the gear transmission mechanism.

Optionally, the limiting screw is provided with a key groove arranged along the axis direction of the limiting screw, a guide key is fixed on the housing, the guide key is embedded into the key groove, and the length of the key groove is greater than that of the guide key so as to realize sliding connection between the limiting screw and the housing.

Optionally, the end part of the limiting screw rod extending out of the shell is provided with a limiting bearing, and the limiting screw rod is in contact with the part of the die extending out of the socket end of the winding structure wall pipe through the limiting bearing.

Optionally, one end of the limiting screw is used for contacting with a die, the other end of the limiting screw is fixed with a position detection block located outside the shell, the shell is fixed with a first proximity switch and a second proximity switch through a mounting plate, the limiting screw stretches out of the shell and reaches a set distance with the first proximity switch, the first proximity switch can send a stop signal, the limiting screw is taken in the shell and reaches the set distance with the second proximity switch, and the second proximity switch can send the stop signal.

Optionally, a first limit switch and a second limit switch are further fixed on the mounting plate and are respectively used for limiting the maximum distance of the limit lead screw extending out of and retracting into the shell.

Optionally, a connecting screw rod is fixed to one end, located inside the shell, of the limiting screw rod, the connecting screw rod extends out of the shell and is fixed with a position detection block, and the position detection block can be in contact with the first limiting switch and the second limiting switch.

Optionally, still be equipped with the fixed bolster that can follow the winding arrangement wall pipe axis direction motion of waiting to process in the pivot, fixed bolster and runing rest contact, the fixed bolster can drive the runing rest along the axis direction motion of waiting to process the winding arrangement wall pipe.

Optionally, the rotary driving part adopts an air cylinder, a cylinder body of the air cylinder is hinged to the fixed support, and a piston rod of the air cylinder is hinged to the rotary support.

In a second aspect, embodiments of the present invention provide a working method of a winding structure wall pipe socket cutting device: the limiting screw rod extends out of a first set distance of the shell, so that the rotating driving piece drives the rotary support to rotate around the rotating shaft to the end part of the limiting screw rod and the part of the die extending out of the socket end of the wall pipe of the winding structure to be processed is contacted, the cutting mechanism and the wall pipe of the winding structure to be processed have a second set distance, the cutting mechanism is started, the driving mechanism drives the limiting screw rod to move through the limiting piece, when the limiting screw rod retracts into the shell, the rotating driving piece drives the rotary support to move, the cutting mechanism moves towards the wall pipe of the winding structure to be processed, the socket end of the wall pipe of the winding structure to be processed is cut, the socket end of the wall pipe of the winding structure to be cut reaches a set size, the driving mechanism stops working, and the telescopic piece drives the rotary support to rotate and reset.

The invention has the beneficial effects that:

1. according to the cutting device, the end part of the limiting lead screw can be in contact with the part of the die extending out of the socket end of the winding structure wall pipe, the limiting lead screw can be automatically recovered to the shell by using the driving mechanism and is matched with the telescopic piece, so that the cutting mechanism can realize automatic slow feeding, the phenomenon that a motor of the cutting mechanism is blocked is avoided, meanwhile, the limiting lead screw automatically works by using the driving mechanism, manual operation is not needed, and the labor intensity of workers is reduced.

2. The cutting device provided by the invention is provided with the first proximity switch, the second proximity switch, the first limit switch and the second limit switch, and the distance of the limit lead screw extending out of and retracting into the shell can be accurately limited, so that the cutting depth can be accurately controlled, and the processing precision of a product is ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic view of a socket of a conventional winding structure wall pipe;

FIG. 2 is a schematic structural diagram of a conventional wall pipe socket cutting device with a winding structure;

FIG. 3 is a side view of the whole structure of embodiment 1 of the present invention;

FIG. 4 is a front view of the overall structure of embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of a limiting mechanism in embodiment 1 of the present invention;

FIG. 6 is a first schematic sectional view of a limiting mechanism according to embodiment 1 of the present invention;

FIG. 7 is a schematic sectional view of a second limiting mechanism according to embodiment 1 of the present invention;

the cutting machine comprises a base, a socket, a spigot, a limiting block, a screw rod, a hand wheel, a winding structure wall pipe, a mould, a roller frame, a rotating shaft, a rotating support, a fixing support, a cylinder, a cutter support, a cutter, a driving motor, a limiting mechanism and a travelling wheel, wherein the base is 1, the spigot is 2, the limiting block is 3, the screw rod is 4, the hand wheel is 5, the winding structure wall pipe is 6, the mould is 7, the roller is 8, the roller frame is 9, the rotating shaft is 10, the rotating support is 11, the fixing support is 12, the cylinder is 13, the cutter support is 14, the cutter is 15, the driving motor is 16, the limiting mechanism is 17, and the travelling wheel is 18;

17-1 parts of a shell, 17-2 parts of a connecting plate, 17-3 parts of a limit nut, 17-4 parts of a first gear, 17-5 parts of a second gear, 17-6 parts of a driving mechanism shell, 17-7 parts of a driving piece, 17-8 parts of a limit screw rod, 17-9 parts of a guide key, 17-10 parts of a mounting plate, 17-11 parts of a connecting screw rod, 17-12 parts of a position detection block, 17-13 parts of a first proximity switch, 17-14 parts of a second proximity switch, 17-15 parts of a first limit switch, and 17-16 parts of a second limit switch.

Detailed Description

Example 1

The embodiment discloses a cutting device for a socket of a winding structure wall pipe, which comprises a supporting mechanism, a rotating bracket, a fixed bracket, a rotating shaft, a cutting mechanism and the like, as shown in fig. 3-4.

The bearing mechanism is used for driving the winding structure wall pipe 6 to be processed and the mold 7 inside the winding structure wall pipe to rotate, in the embodiment, the winding structure wall pipe to be processed is coaxially sleeved on the periphery of the mold, the inner side surface of the winding structure wall pipe is attached to the outer side surface of the mold, and the two ends of the mold respectively extend out of the bell mouth and the socket of the winding structure wall pipe.

The supporting mechanism comprises two groups of rollers 8 which are respectively arranged at two sides of a female end and a male end of the wall pipe of the winding structure to be processed and are respectively used for supporting the part of the mold extending out of the wall pipe of the winding structure to the outside of the female end and the male end.

Every group includes two gyro wheels, utilizes two gyro wheels to support the mould, and the gyro wheel rotates with gyro wheel frame 9 to be connected, and the gyro wheel frame is fixed on supporting the support body, support the support body and fix on ground basis, in two sets of four gyro wheels, at least one gyro wheel wherein is connected with gyro wheel actuating mechanism, and gyro wheel actuating mechanism can drive the gyro wheel and rotate, and then drives mould and winding arrangement wall pipe through frictional force and rotate.

The roller driving mechanism adopts a motor which is fixed on the ground contact or the roller carrier, and an output shaft of the motor is connected with the rollers and can drive the rollers to rotate.

In other embodiments, the supporting mechanism may employ two clamping members, the two clamping members respectively clamp the mold through two ends of the mold, one of the clamping members is connected to a rotating driving member, the rotating driving member may employ a motor, and the rotating driving member may drive the winding structure wall pipe and the mold to rotate through the clamping members.

One side of bearing mechanism is provided with pivot 10, and the pivot setting is in one side that two sets of gyro wheels of bearing mechanism are connected, the axis of pivot is parallel with the line between two sets of gyro wheels for the axis of pivot can be on a parallel with the axis of placing at the mould of bearing mechanism and winding arrangement wall pipe.

The pivot is fixed to be set up, and in this embodiment, the both ends of pivot are fixed on the pivot support body, the pivot support body is fixed on ground basis.

The pivot is rotated with the one end of runing rest 11 and is connected, and is concrete, the one end of runing rest is provided with two and rotates the otic placode, the pivot is passed rotate the otic placode and with rotate otic placode clearance fit, the runing rest can revolute the rotation of axes.

Be provided with fixed bolster 12 between two rotation otic placodes, the fixed bolster adopts L type structure, including first fixed bolster portion and second fixed bolster portion, the one end and the pivot sliding connection of first fixed bolster portion, first fixed bolster portion with rotate the otic placode contact, can drive the axis direction motion of runing rest along the pivot.

Further, in order to ensure the stability of the movement of the rotating bracket along the axis of the rotating shaft, a walking wheel 18 is arranged at the end part of the second fixed bracket part and is in contact with the ground foundation.

The upper surface of second fixed bolster portion is equipped with the extensible member, the extensible member is connected with runing rest, can drive runing rest and revolve the rotation of axes.

In this embodiment, the telescopic part adopts the cylinder 13, the cylinder body of cylinder articulates on second fixed bolster portion, the piston rod of cylinder is articulated with the runing rest, and the concertina movement of cylinder piston rod can drive the runing rest around the rotation of axis of rotation. It will be appreciated that the telescopic member may also be a hydraulic cylinder or a linear motor, as long as it can output linear motion.

The rotary support is provided with a cutting mechanism for cutting the socket end of the winding structure wall pipe, and the telescopic piece can drive the cutting mechanism to move through the rotary support because the rotary support is rotationally connected with the rotating shaft, so that the cutting mechanism can perform feed motion towards the winding structure wall pipe or move away from the winding structure wall pipe.

The cutting mechanism comprises a cutter support 14 which is arranged on the upper surface of the end part of the rotating support and close to the bearing mechanism, a cutter 15 is rotatably connected onto the cutter support, the cutter is connected with a power mechanism arranged on the bottom surface of the rotating support through a belt transmission mechanism, the power mechanism adopts a driving motor 16, the driving motor is fixed on the bottom surface of the rotating support, an output shaft of the driving motor is connected with a driving belt wheel, the cutter is connected with a driven belt wheel, a transmission belt is connected between the driving belt wheel and the driven belt wheel in a winding manner, and the driving motor can drive the cutter to rotate through the belt transmission mechanism so as to cut the socket part of the winding structure wall pipe.

In other embodiments, the cutter may be directly connected to the drive motor or connected to the drive motor through another type of transmission mechanism.

And a limiting mechanism 17 is further fixed at the end part of the rotating bracket close to the bearing mechanism.

As shown in fig. 5-7, the limiting mechanism comprises a housing 17-1, a connecting plate 17-2 is arranged on the top of the housing, the housing is fixedly connected with the rotating bracket through the connecting plate and a bolt,

the inner part of the shell is rotatably connected with a limiting part, in the embodiment, the limiting part is a limiting nut 17-3, preferably, the limiting nut is a trapezoidal nut, the limiting nut is connected with a driving mechanism, and the driving mechanism can drive the limiting nut to rotate around the axis of the driving mechanism.

The driving mechanism comprises a first gear 17-4 fixed on the periphery of the limiting nut in a sleeved mode, the first gear comprises an engaging portion and a connecting portion, the connecting portion is connected with the shell in a rotating mode through a bearing, the engaging portion is engaged with a second gear 17-5, the second gear is connected with a driving mechanism shell 17-6 in a rotating mode through a bearing, the driving mechanism shell is fixed to the shell, the second gear is connected with a driving piece 17-7, the driving piece can drive the second gear to rotate, the driving piece adopts a motor, a motor shell of the motor is fixed to the shell through the driving mechanism shell, and an output shaft of the motor is connected with the second gear.

The motor can drive the limiting nut to rotate around the axis of the motor through the gear transmission mechanism.

The limiting nut penetrates through a limiting lead screw 17-8, and the limiting lead screw is in threaded connection with the limiting nut.

In order to avoid the abrasion damage of the limiting screw rod to the die, the limiting screw rod is rotatably connected with limiting bearings 17-17 through a bearing frame at the top end of the limiting screw rod extending out of the shell through the top end of the shell, and the end part of the limiting screw rod can be contacted with the part of the die extending out of the socket end of the winding structure wall tube through the limiting bearings.

The limiting nut rotates to drive the limiting lead screw to move along the axis direction of the limiting lead screw, in order to enable the limiting lead screw to only move along the axis direction of the limiting lead screw, the shell is fixedly provided with a plurality of guide keys 17-9 matched with the guide keys through bolts, the limiting lead screw is provided with a plurality of key grooves matched with the guide keys, the key grooves are arranged along the axis direction of the limiting lead screw, the guide keys are embedded into the key grooves, the length of the key grooves is greater than that of the guide keys, the guide keys can limit the limiting lead screw to rotate around the axis of the limiting lead screw, and meanwhile the guide keys cannot hinder the limiting lead screw to move along the axis direction of the limiting lead screw.

The bottom end of the shell is fixedly provided with two mounting plates 17-10 through connecting bolts, the bottom end of the limiting lead screw is fixedly provided with a connecting screw rod 17-11, the connecting screw rod penetrates through the bottom end of the shell and extends out of the shell, and the bottom end of the connecting screw rod is fixedly provided with a position detection block 17-12 through a fixing nut.

And when the limiting screw rod retracts to the inside of the shell, the movement to the position detection block and the second proximity switch reach the set distance, the second proximity switch can send a signal to control the limiting screw rod to stop moving.

In order to ensure the safety of the movement of the limiting screw rod, the limiting screw rod needs to be limited by the maximum distance extending outwards and the maximum distance recovered inwards, therefore, a first limiting switch 17-15 and a second limiting switch 17-16 are arranged on the other mounting plate, the first limiting switch is arranged close to the bottom end of the shell, and both the first limiting switch and the second limiting switch can be touched with the position detection block.

When the limiting screw extends out of the position detection block and touches the first limiting switch, the maximum extending distance of the limiting screw is reached at the moment, the first limiting switch sends a signal, the driving part stops working, when the limiting screw is recovered to the position detection block and touches the second limiting switch, the maximum extending distance of the limiting screw is reached at the moment, the second limiting switch sends a signal, the driving part stops working, and the maximum extending and withdrawing distance of the limiting screw is limited through the first limiting switch and the second limiting switch.

In this embodiment, the cylinder, the motor, the limit switch and the proximity switch are all connected with the control system, the limit switch and the proximity switch can send signals to the control system, and the control system can send instructions to the cylinder and the motor to control the cylinder and the motor to work. Preferably, the control system adopts a PLC control system.

Example 2:

the embodiment discloses a working method of a winding structure wall pipe socket cutting device, which comprises the following steps:

and placing the winding structure wall pipe to be processed and the mold inside the winding structure wall pipe on a bearing mechanism, and supporting two ends of the mold by utilizing rollers.

According to a preset program, the control system controls the driving piece to work, the limiting nut rotates around the axis of the limiting nut, and the limiting lead screw extends out of the shell for a first set distance.

The control system controls the air cylinder to work, a piston rod of the air cylinder extends out to drive the rotary support to rotate until a bearing at the end part of the limiting lead screw is contacted with a part of the mould extending out of the socket end of the winding structure wall pipe, and the cutter and the winding structure wall pipe have a second set distance;

control system sends the instruction to power unit, and power unit drives the cutter and rotates, and control system sends the instruction to the driving piece simultaneously, and the driving piece drives limit nut antiport, and limit screw is the motion of slowly income casing, and when limit screw moved, under the effect of cylinder, runing rest further rotated for the cutter is close to the winding arrangement wall pipe, cuts until with the socket end of winding arrangement wall pipe contact to the winding arrangement wall pipe.

When the position detection block of the limiting lead screw moves to reach a set distance with the second proximity switch, namely the cutting depth of the winding structure wall pipe reaches a set size, the second proximity switch sends a signal to the control system, the control system stops the driving piece from working, and the limiting lead screw stops moving.

The control system controls the electromagnetic valve connected with the air cylinder to act, so that the piston rod of the air cylinder retracts, the control system controls the limiting screw rod to automatically reset, and the power mechanism stops working.

In this embodiment, runing rest can slide along pivot axis direction, satisfies different specification winding arrangement wall pipe socket cutting demands, before the cutting, needs to remove runing rest to the settlement position department that winding arrangement wall pipe corresponds along the pivot, then begins cutting work.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

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