阅读说明：本技术 一种用于塑料管收紧的装置 (Device for tightening plastic pipe ) 是由 管越峰 曹淼 连升炯 陈佳雯 徐超悦 徐嘉辉 于 2019-03-14 设计创作，主要内容包括：本发明属于塑料管技术领域,尤其涉及一种用于塑料管收紧的装置,它包括嵌套螺旋杆、安装壳、波纹管、挤压弹簧、驱动机构,该收紧装置,在工作过程中,当需要将波纹管收紧时,首先控制驱动自锁电机工作,经过减速器和差速器的传递使得三个第二驱动齿轮转动通过其上的驱动齿牙驱动波纹管向安装壳内侧移动嵌套在嵌套螺旋杆上,当波纹管上的波纹部分完全移动到安装壳内时,挤压弹簧被压缩,且在这种状态下挤压弹簧的压力大于嵌套螺旋杆的弹力,之后经过差速器的调节,第二齿轮开始转动,第二齿轮转动就会通过驱动齿条带动滑动壳移动；使得嵌套在嵌套螺旋杆上的波纹管在嵌套螺旋杆上相邻两个螺旋圈之间的波纹管紧挨在一起,降低波纹管缩占用的空间。(The invention belongs to the technical field of plastic pipes, and particularly relates to a device for tightening a plastic pipe, which comprises a nested spiral rod, an installation shell, a corrugated pipe, an extrusion spring and a driving mechanism, wherein in the working process, when the corrugated pipe needs to be tightened, a driving self-locking motor is firstly controlled to work, three second driving gears are driven to rotate through driving teeth on the three second driving gears to drive the corrugated pipe to move towards the inner side of the installation shell to be nested on the nested spiral rod through the transmission of a speed reducer and a differential mechanism, the extrusion spring is compressed when a corrugated part on the corrugated pipe completely moves into the installation shell, the pressure of the extrusion spring is greater than the elastic force of the nested spiral rod in the state, and then through the adjustment of the differential mechanism, a second gear starts to rotate, and the second gear rotates to drive a sliding shell to move through a driving rack; the corrugated pipes nested on the nested screw rod are close to each other between two adjacent spiral coils on the nested screw rod, and the space occupied by the corrugated pipes is reduced.)

1. A device for tightening plastic pipes, characterized in that: the corrugated pipe type screw driver comprises a nested screw rod, a mounting shell, a corrugated pipe, an extrusion spring and a driving mechanism, wherein one side of the mounting shell is provided with a pipe hole, the nested screw rod is hollow, the nested screw rod is mounted in the mounting shell, and one end of the nested screw rod penetrates out of the mounting shell and is mounted at one end, which is not provided with the pipe hole, in the mounting shell; the extrusion spring is wound and installed on the outer circular surface of the nested screw rod, and one end of the extrusion spring is fixedly installed on the side surface which is not provided with the pipe hole in the installation shell; one end of the corrugated pipe penetrates through the pipe hole formed in the mounting shell and is nested at one end, close to the pipe hole, of the nested screw rod, the corrugated pipe is in sliding fit with the nested screw rod, and one end, located in the mounting shell, of the corrugated pipe is in contact fit with one end, close to the pipe hole, of the extrusion spring; the driving mechanism is arranged in the mounting shell and is in sliding fit with the mounting shell;

the driving mechanism comprises a sliding shell, a driving self-locking motor, a speed reducer, a differential mechanism, a first output shaft, a second output shaft and a limiting plate, wherein the sliding shell is installed in the installation shell in a sliding fit mode, a corrugated pipe hole and an avoiding hole are formed in the sliding shell, a corrugated pipe enters the sliding shell through the corrugated pipe hole, and penetrates out of the sliding shell through the avoiding hole; the driving self-locking motor is arranged in the sliding shell, the speed reducer is arranged in the sliding shell through two second supports which are symmetrically distributed, and an input shaft of the speed reducer is connected with an output shaft of the driving self-locking motor; the differential is arranged in the sliding shell through a first support, and an input shaft of the differential is connected with an output shaft of the speed reducer; the differential is provided with a first output shaft and a second output shaft, the first output shaft controls the sliding of the sliding shell, and the second output shaft controls the movement of the corrugated pipe; a limiting plate for limiting the corrugated pipe to be separated from the mounting shell is arranged in the driving mechanism;

the lower side surface of the mounting shell is provided with a trapezoidal guide groove, the lower end of the sliding shell is provided with a trapezoidal guide block, and the sliding shell is mounted in the mounting shell through the matching of the trapezoidal guide block and the trapezoidal guide groove;

the sliding shell is provided with a shaft hole, one end of a first output shaft on the differential mechanism penetrates through the shaft hole and is positioned outside the sliding shell, and a second gear is arranged on the first output shaft and is positioned outside the sliding shell; a driving rack is arranged in the mounting shell along the axial direction of the nested screw rod, the driving rack is positioned in the middle of the nested screw rod, and the driving rack is meshed with the second gear;

one end of the corrugated pipe is provided with a connecting pipe, the connecting pipe is smoothly matched with the nested screw rod, one end of the connecting pipe is provided with a driving circular plate, the driving circular plate is in contact fit with one end of the extrusion spring close to the pipe hole, and a sealing device is arranged between the driving circular plate and the nested screw rod; the other end of the connecting pipe is provided with a limiting circular plate which is matched with a limiting plate arranged on the inner side of the sliding shell;

the first gear is arranged on a second output shaft on the differential mechanism, the fixed support is arranged in the sliding shell, the gear ring is arranged on one side of the fixed support through rotating fit, teeth which are uniformly distributed are arranged on the outer circular surface of the gear ring, helical teeth are arranged on the inner circular surface of the gear ring, and the gear ring is meshed with the first gear through the teeth on the outer circular surface; the three fourth rotating shafts are respectively arranged on the fixed supports through two symmetrically distributed fourth supports, and the three second driving gears are respectively arranged on the three fourth rotating shafts; the outer circular surface of the second driving gear is uniformly provided with a plurality of driving teeth in the circumferential direction, the driving teeth uniformly distributed in the circumferential direction of the second driving gear are uniformly provided with a plurality of arc-shaped tooth sockets in the circumferential direction, the second driving gear is meshed with the helical teeth on the tooth ring through the arc-shaped tooth sockets uniformly distributed in the circumferential direction, and the driving teeth uniformly distributed in the second driving gear are meshed with the corrugated teeth on the outer circular surface of the corrugated pipe.

2. A device for tightening plastic tubes according to claim 1, characterized in that: the fixed support is provided with a trapezoidal ring groove, one side of the gear ring is provided with a trapezoidal ring block, and the gear ring is arranged on one side of the fixed support through the matching of the trapezoidal ring block and the trapezoidal ring groove.

3. A device for tightening plastic tubes according to claim 1, characterized in that: the sliding shell is provided with an extrusion plate which is matched with the nested screw rod.

4. A device for tightening plastic tubes according to claim 1, characterized in that: one end of the nested screw rod, which is close to the pipe hole, is provided with a hollow fixed shaft which is mutually communicated with the nested screw rod, the fixed shaft is provided with a fixed plate, three third rotating shafts are respectively arranged on the fixed plate through two third supports which are symmetrically distributed, and three first driving gears are respectively arranged on the three third rotating shafts; the first driving gear and the second driving gear have the same structure, the connecting gear is arranged on the fixed shaft, a plurality of helical teeth are uniformly arranged on the circumferential direction of the outer circular surface of the connecting gear, and the connecting gear is meshed with the arc-shaped tooth grooves on the three first driving gears; the driving teeth evenly distributed on the first driving gear are meshed with the corrugated teeth on the inner circular surface of the corrugated pipe.

5. A device for tightening plastic tubes according to claim 4, characterized in that: the above-described solution as one fixed plate, one set of first driving gears and one connecting gear is replaced by three fixed plates, three sets of first driving gears and three connecting gears.

6. A device for tightening plastic tubes according to claim 1, characterized in that: the extrusion spring is a compression spring, and the nested screw rod has compressibility.

Technical Field

The invention belongs to the technical field of plastic pipes, and particularly relates to a device for tightening a plastic pipe.

Background

The corrugated pipe is a tubular elastic sensitive element which is formed by connecting foldable corrugated sheets along the folding and stretching direction. Since the expansion of the bellows requires a large volume change, it takes up a large space for storage and use, and the management of the bellows by the user requires much effort, it is very necessary to design a bellows tightening device that can be automatically contracted for storage.

The present invention is directed to a device for tightening plastic pipes that solves the above problems.

Disclosure of Invention

In order to solve the above-mentioned defects in the prior art, the invention discloses a device for tightening a plastic pipe, which is realized by adopting the following technical scheme.

A device for tightening plastic pipes, characterized in that: the corrugated pipe type screw driver comprises a nested screw rod, a mounting shell, a corrugated pipe, an extrusion spring and a driving mechanism, wherein one side of the mounting shell is provided with a pipe hole, the nested screw rod is hollow, the nested screw rod is mounted in the mounting shell, and one end of the nested screw rod penetrates out of the mounting shell and is mounted at one end, which is not provided with the pipe hole, in the mounting shell; one end of the nested screw rod, which penetrates out of the mounting shell, is convenient to be communicated with the outside, the extrusion spring is wound and mounted on the outer circular surface of the nested screw rod, and one end of the extrusion spring is fixedly mounted on the side surface, which is not provided with the pipe hole, in the mounting shell; the extrusion spring has the effects that when the corrugated pipe moves towards the inner side of the mounting shell under the driving of the driving mechanism, the corrugated pipe can extrude the extrusion spring to enable the extrusion spring to be compressed, the corrugated pipe occupies the space of the original extrusion spring wound on the nested spiral rod and is nested on the nested spiral rod, and when the corrugated pipe moves towards the outer side of the mounting shell under the action of the driving mechanism, the extrusion spring can be always kept in contact with the corrugated pipe under the action of the pressure of the extrusion spring; the compression performance of the extrusion spring ensures that the corrugated pipe can freely enter and exit the mounting shell without interfering with the extrusion spring; one end of the corrugated pipe penetrates through the pipe hole formed in the mounting shell and is nested at one end, close to the pipe hole, of the nested screw rod, the corrugated pipe is in sliding fit with the nested screw rod, and one end, located in the mounting shell, of the corrugated pipe is in contact fit with one end, close to the pipe hole, of the extrusion spring; the driving mechanism is installed in the installation shell and is in sliding fit with the installation shell.

The driving mechanism comprises a sliding shell, a driving self-locking motor, a speed reducer, a differential mechanism, a first output shaft, a second output shaft and a limiting plate, wherein the sliding shell is installed in an installation shell in a sliding fit mode, the sliding shell can slide in the installation shell, and the sliding shell can push a nested screw rod to compress the nested screw rod in the sliding process, so that corrugated pipes between two adjacent spiral coils of the corrugated pipes nested on the nested screw rod are close to each other on the nested screw rod, the space occupied by the corrugated pipes is reduced, and meanwhile, when the corrugated pipes are in the nesting process, due to the fact that the distance between two adjacent spiral coils of the nested screw rod is large in the initial state, the corrugated pipes between two adjacent spiral coils of the nested screw rod cannot be mutually wound and inserted to influence nesting of the corrugated pipes. The sliding shell is provided with a corrugated pipe hole and an avoiding hole, and the corrugated pipe enters the sliding shell through the corrugated pipe hole and penetrates out of the sliding shell through the avoiding hole; the driving self-locking motor is arranged in the sliding shell, the speed reducer is arranged in the sliding shell through two second supports which are symmetrically distributed, and an input shaft of the speed reducer is connected with an output shaft of the driving self-locking motor; the driving self-locking motor is used in the invention, when the corrugated pipe has a corrugated part which is completely moved into the mounting shell, and the differential mechanism controls the nested screw rod to be compressed, the self-locking is realized by driving the self-locking motor; the input shaft of the differential is fixed and does not rotate, the corrugated pipe has a trend of moving outwards under the action of the extrusion spring, namely, the first gear has a trend of rotating, the sliding shell enables the sliding shell to have a trend of moving towards an initial position under the action of the elastic force of the nested screw rod, namely, the second gear has a trend of rotating, but the direction in which the second gear drives the first output shaft to rotate and the direction in which the second gear drives the first output shaft to rotate are the same in the same direction through the internal structure of the gear differential, and the two gears are self-locked with each other; the differential is arranged in the sliding shell through a first support, and an input shaft of the differential is connected with an output shaft of the speed reducer; the differential is provided with a first output shaft and a second output shaft, the first output shaft controls the sliding of the sliding shell, and the second output shaft controls the movement of the corrugated pipe; a limiting plate for limiting the corrugated pipe to be separated from the mounting shell is arranged in the driving mechanism; the limiting plate is used for preventing the corrugated pipe from being separated from the mounting shell in the outward winding and separating process to influence the next nesting.

As a further improvement of the technology, a trapezoidal guide groove is arranged on the lower side surface of the installation shell, a trapezoidal guide block is arranged at the lower end of the sliding shell, and the sliding shell is arranged in the installation shell through the matching of the trapezoidal guide block and the trapezoidal guide groove.

As a further improvement of the technology, the sliding shell is provided with a shaft hole, one end of a first output shaft on the differential mechanism passes through the shaft hole and is positioned outside the sliding shell, and a second gear is arranged on the first output shaft and is positioned outside the sliding shell; a driving rack is arranged in the mounting shell along the axial direction of the nested screw rod, the driving rack is positioned in the middle of the nested screw rod, and the driving rack is meshed with the second gear; when the second gear rotates, the second gear can move along the driving rack under the action of the driving rack, and the second gear moves to drive the sliding shell to move; the sliding shell moves to press the nested screw rods.

As a further improvement of the technology, one end of the corrugated pipe is provided with a connecting pipe, the connecting pipe is smoothly matched with the nested screw rod, one end of the connecting pipe is provided with a driving circular plate, the driving circular plate is in contact fit with one end of the extrusion spring close to the pipe hole, and a sealing device is arranged between the driving circular plate and the nested screw rod; the sealing device is used for preventing a gap from being formed between the nested screw rod and the corrugated pipe; the sealing performance of the nested screw rod and the corrugated pipe is influenced; the driving round plate has the function that when the corrugated pipe is nested on the nesting spiral rod, the driving round plate can push the extrusion spring to compress the extrusion spring under the driving of the corrugated pipe; the other end of the connecting pipe is provided with a limiting circular plate which is matched with a limiting plate arranged on the inner side of the sliding shell; the limiting circular plate is used for limiting the limiting circular plate through a limiting plate, namely limiting the corrugated pipe to the moving direction of the outer side of the mounting shell.

As a further improvement of the technology, a first gear is arranged on a second output shaft on the differential, a fixed support is arranged in a sliding shell, a toothed ring is arranged on one side of the fixed support through rotating fit, teeth are uniformly distributed on the outer circular surface of the toothed ring, helical teeth are arranged on the inner circular surface of the toothed ring, and the toothed ring is meshed with the first gear through the teeth on the outer circular surface; the three fourth rotating shafts are respectively arranged on the fixed supports through two symmetrically distributed fourth supports, and the three second driving gears are respectively arranged on the three fourth rotating shafts; a plurality of driving teeth are uniformly arranged on the outer circumferential surface of the second driving gear in the circumferential direction, a plurality of arc-shaped tooth grooves are uniformly formed in the circumferential direction of the driving teeth uniformly distributed on the second driving gear in the circumferential direction, the second driving gear is meshed with the helical teeth on the tooth ring through the uniformly distributed arc-shaped tooth grooves, and the driving teeth uniformly distributed on the second driving gear are meshed with the corrugated teeth on the outer circumferential surface of the corrugated pipe; when the first gear rotates, the first gear can drive the gear ring meshed with the first gear to rotate, the gear ring rotates to drive the three second driving gears meshed with the gear ring through the helical teeth and the arc-shaped tooth grooves to rotate, and the three second driving gears rotate to drive the corrugated pipe to move through the driving teeth on the three second driving gears.

As a further improvement of the technology, the fixed support is provided with a trapezoidal ring groove, one side of the gear ring is provided with a trapezoidal ring block, and the gear ring is arranged on one side of the fixed support through the matching of the trapezoidal ring block and the trapezoidal ring groove.

As a further improvement of the technology, the sliding shell is provided with an extrusion plate, the extrusion plate is matched with the nested screw rod, and the extrusion plate is used for pushing the nested screw rod to move when the sliding shell moves towards one side of the nested screw rod; the uniform up-and-down stress of the nested screw rod is ensured.

As a further improvement of the technology, a hollow fixed shaft which is mutually communicated with the nested screw rod is arranged at one end, close to the pipe hole, of the nested screw rod, a fixed plate is arranged on the fixed shaft, three third rotating shafts are respectively arranged on the fixed plate through two third supports which are symmetrically distributed, and three first driving gears are respectively arranged on the three third rotating shafts; the first driving gear and the second driving gear have the same structure, the connecting gear is arranged on the fixed shaft, a plurality of helical teeth are uniformly arranged on the circumferential direction of the outer circular surface of the connecting gear, and the connecting gear is meshed with the arc-shaped tooth grooves on the three first driving gears; the driving teeth uniformly distributed on the first driving gear are meshed with the corrugated teeth on the inner circular surface of the corrugated pipe; when the corrugated pipe moves, the corrugated pipe drives the three first driving gears to rotate through the corrugated teeth on the corrugated pipe, the three first driving gears rotate to drive the connecting gears meshed with the three first driving gears to rotate, and the rotation of the connecting gears ensures the rotation synchronism of the three first driving gears, namely the movement synchronism of the corrugated pipe.

As a further improvement of the present technology, the above-described solution as one fixed plate, one set of first driving gears and one connecting gear is replaced with three fixed plates, three sets of first driving gears and three connecting gears.

As a further improvement of the technology, the extrusion spring is a compression spring, and the nested screw rod has compressibility.

Compared with the traditional plastic pipe technology, the designed tightening device firstly controls and drives the self-locking motor to work when the corrugated pipe needs to be tightened in the working process, the first gear is driven to rotate through the transmission of the speed reducer and the differential mechanism, the three second driving gears are driven to rotate through the first gear, the three second driving gears drive the corrugated pipe to move towards the inner side of the mounting shell through the driving teeth on the three second driving gears to be nested on the nested spiral rod, when the corrugated part on the corrugated pipe completely moves into the mounting shell, the extrusion spring is compressed, the pressure of the extrusion spring is greater than the elastic force of the nested spiral rod in the state, then the first gear stops rotating through the adjustment of the differential mechanism, the second gear starts to rotate, and the second gear rotates to drive the sliding shell to move through the driving rack; the corrugated pipes nested on the nested screw rod are close to each other between two adjacent spiral coils on the nested screw rod, and the space occupied by the corrugated pipes is reduced.

Drawings

Fig. 1 is a schematic view of the overall component distribution.

Fig. 2 is a partial installation schematic of the integral components.

Figure 3 is a schematic view of the drive rack mounting.

Fig. 4 is a schematic view of the structure of the mounting case.

Fig. 5 is a schematic view of a compression spring installation.

Fig. 6 is a schematic view of the engagement of the drive rack with the second gear.

Fig. 7 is a schematic view of the installation of the driving self-locking motor.

Figure 8 is a schematic view of a bellows mated with a nested helical rod.

FIG. 9 is a fixed axle installation schematic.

Fig. 10 is a schematic view of a bellows structure.

Fig. 11 is a schematic view of a slide housing construction.

Fig. 12 is a schematic view of the first gear meshing with the ring gear.

Fig. 13 is a schematic view of the engagement of the limiting circular plate with the limiting plate.

Fig. 14 is a schematic diagram of a structure of a limiting plate.

Fig. 15 is a first gear mounting schematic.

Fig. 16 is a schematic view of the first and second drive gears in cooperation with the bellows.

Fig. 17 is a schematic view of the first drive gear in cooperation with the connecting gear.

Fig. 18 is a schematic view of a connecting gear structure.

Fig. 19 is a schematic view of a fixed support structure.

Fig. 20 is a schematic view of a trapezoidal ring block installation.

Fig. 21 is a schematic view of the second drive gear engaging the ring gear.

Fig. 22 is a schematic view of a second drive gear configuration.

Number designation in the figures: 1. nesting a screw rod; 2. mounting a shell; 3. a bellows; 4. a compression spring; 5. a sliding shell; 6. a trapezoidal guide groove; 7. driving a self-locking motor; 8. a drive rack; 9. a second gear; 10. a tube hole; 11. a pressing plate; 12. a connecting pipe; 13. a speed reducer; 14. a differential mechanism; 15. a fixed shaft; 16. a limiting circular plate; 17. driving the circular plate; 18. avoiding holes; 19. a shaft hole; 20. a trapezoidal guide block; 21. a corrugated tube hole; 22. a limiting plate; 23. fixing and supporting; 24. a first gear; 25. a toothed ring; 26. a first output shaft; 27. a drive mechanism; 28. a second output shaft; 29. a first support; 30. a second support; 32. a first drive gear; 33. a fixing plate; 34. a connecting gear; 35. a third rotating shaft; 36. a third support; 37. an arc-shaped tooth socket; 38. driving the teeth; 39. a trapezoidal ring groove; 40. a trapezoidal ring block; 41. a fourth rotating shaft; 42. a fourth support; 43. a second drive gear.

Detailed Description

As shown in fig. 1, the device comprises a nested screw rod 1, a mounting shell 2, a corrugated pipe 3, an extrusion spring 4 and a driving mechanism 27, wherein as shown in fig. 4, one side of the mounting shell 2 is provided with a pipe hole 10, the nested screw rod 1 is hollow, as shown in fig. 2, the nested screw rod 1 is mounted in the mounting shell, and one end of the nested screw rod 1 penetrates through the mounting shell 2 and is mounted at one end of the mounting shell 2, which is not provided with the pipe hole 10; as shown in fig. 5, the extrusion spring 4 is wound and installed on the outer circumferential surface of the nested screw rod 1, and one end of the extrusion spring 4 is fixedly installed on the side surface of the installation shell 2, which is not provided with the pipe hole 10; the function of the extrusion spring 4 is that when the corrugated pipe 3 moves towards the inner side of the mounting shell 2 under the driving of the driving mechanism 27, the corrugated pipe 3 extrudes the extrusion spring 4 to enable the extrusion spring 4 to be compressed, the corrugated pipe 3 occupies the space of the original extrusion spring 4 wound on the nested screw rod 1 and is nested on the nested screw rod 1, and when the corrugated pipe 3 moves towards the outer side of the mounting shell 2 under the action of the driving mechanism 27, the extrusion spring 4 keeps contact with the corrugated pipe 3 under the action of the self pressure; the compression performance of the extrusion spring 4 ensures that the corrugated pipe 3 can freely enter and exit the installation shell 2 without interfering with the extrusion spring 4; as shown in fig. 3, one end of the corrugated tube 3 passes through a tube hole 10 formed in the mounting shell 2 and is nested at one end of the nested screw rod 1 close to the tube hole 10, the corrugated tube 3 is in sliding fit with the nested screw rod 1, and one end of the corrugated tube 3 located in the mounting shell 2 is in contact fit with one end of the extrusion spring 4 close to the tube hole 10; the drive mechanism 27 is mounted within the mounting housing 2 and the drive mechanism 27 is a sliding fit with the mounting housing 2.

As shown in fig. 7, the driving mechanism 27 includes a sliding shell 5, a driving self-locking motor 7, a speed reducer 13, a differential 14, a first output shaft 26, a second output shaft 28, and a limiting plate 22, wherein as shown in fig. 11, the sliding shell 5 is installed in the installation shell 2 by a sliding fit, the sliding shell 5 can slide in the installation shell 2, and the sliding shell 5 can push the nested screw rod 1 to compress the nested screw rod 1 during a sliding process, so that the corrugated tube 3 nested on the nested screw rod 1 is tightly connected to the corrugated tube 3 between two adjacent screw turns on the nested screw rod 1, the space occupied by the corrugated tube 3 is reduced, and meanwhile, when the corrugated tube 3 is nested, due to a large distance between two adjacent screw turns of the nested screw rod 1 in an initial state, the corrugated tube 3 nested between two adjacent screw turns on the nested screw rod 1 cannot be entangled with each other, influencing the nesting of the bellows 3; as shown in fig. 11, the sliding shell 5 is provided with a bellows hole 21 and an avoidance hole 18, the bellows 3 enters the sliding shell 5 through the bellows hole 21, and passes through the sliding shell 5 through the avoidance hole 18; as shown in fig. 7, the driving self-locking motor 7 is installed in the sliding shell 5, as shown in fig. 15, the speed reducer 13 is installed in the sliding shell 5 through two second supports 30 which are symmetrically distributed, and an input shaft of the speed reducer 13 is connected with an output shaft of the driving self-locking motor 7; the driving self-locking motor 7 is used in the invention, when the corrugated part of the corrugated pipe 3 completely moves into the mounting shell 2, and the differential 14 controls the nested screw rod 1 to be compressed, and then the self-locking is realized by driving the self-locking motor 7; the input shaft of the differential 14 is fixed and does not rotate, the bellows 3 has a tendency to move outwards under the action of the pressing spring 4, namely, the first gear 24 has a tendency to rotate, the sliding shell 5 has a tendency to move towards the initial position under the action of the elastic force of the nested screw rod 1, namely, the second gear 9 has a tendency to rotate, but the direction in which the second gear 9 drives the first output shaft 26 to rotate and the direction in which the second gear 9 drives the first output shaft 26 to rotate are the same in the same direction through the internal structure of the differential 14, and the differential is self-locked with each other; the differential 14 is mounted in the slide housing 5 via a first support 29, the input shaft of the differential 14 being connected to the output shaft of the reduction gear 13; the differential 14 has a first output shaft 26 and a second output shaft 28, the first output shaft 26 controlling the sliding of the sliding housing 5, the second output shaft 28 controlling the movement of the bellows 3; a limit plate 22 which limits the corrugated pipe 3 from separating from the mounting shell 2 is arranged in the driving mechanism 27; the limiting plate 22 is used for preventing the corrugated pipe 3 from being separated from the mounting shell 2 in the outward winding and separating process to influence the next nesting.

In summary, the following steps:

the beneficial effects of the design of the invention are as follows: in the working process of the tightening device, when the corrugated pipe 3 needs to be tightened, the self-locking motor 7 is firstly controlled and driven to work, the first gear 24 is driven to rotate through the transmission of the speed reducer 13 and the differential 14, the three second driving gears 43 are driven to rotate through the first gear 24, the three second driving gears 43 drive the corrugated pipe 3 to move towards the inner side of the mounting shell 2 to be nested on the nested spiral rod 1 through the driving teeth 38 on the three second driving gears 43, when the corrugated part on the corrugated pipe 3 completely moves into the mounting shell 2, the extrusion spring 4 is compressed, the pressure of the extrusion spring 4 is larger than the elastic force of the nested spiral rod 1 in the state, then the first gear 24 stops rotating through the adjustment of the differential 14, the second gear 9 starts to rotate, and the second gear 9 drives the sliding shell 5 to move through the driving rack 8; the corrugated pipes 3 nested on the nested screw rod 1 are close to each other between two adjacent spiral coils of the nested screw rod 1, and the space occupied by the corrugated pipes 3 is reduced.

As shown in fig. 11, a trapezoidal guide groove 6 is installed on the lower side of the mounting housing 2, as shown in fig. 4, a trapezoidal guide block 20 is installed on the lower end of the sliding housing 5, and as shown in fig. 2, the sliding housing 5 is installed in the mounting housing 2 by the cooperation of the trapezoidal guide block 20 and the trapezoidal guide groove 6.

As shown in fig. 11, the sliding housing 5 is provided with a shaft hole 19, one end of a first output shaft 26 of the differential 14 passes through the shaft hole 19 and is positioned outside the sliding housing 5, and as shown in fig. 15, a second gear 9 is mounted on the first output shaft 26 and is positioned outside the sliding housing 5; as shown in fig. 3, a driving rack 8 is installed in the installation shell 2 along the axial direction of the nested screw rod 1, the driving rack 8 is located in the middle of the nested screw rod 1, and the driving rack 8 is meshed with a second gear 9; when the second gear 9 rotates, the second gear 9 can enable the second gear 9 to move along the driving rack 8 under the action of the driving rack 8, and the second gear 9 moves to drive the sliding shell 5 to move; the sliding shell 5 is moved to press the nested screw rod 1.

As shown in fig. 10, a connecting pipe 12 is installed at one end of the bellows 3, as shown in fig. 8, the connecting pipe 12 is smoothly fitted with the nested screw rod 1, as shown in fig. 7, a driving circular plate 17 is installed at one end of the connecting pipe 12, the driving circular plate 17 is in contact fit with one end of the extrusion spring 4 close to the pipe hole 10, and a sealing device is arranged between the driving circular plate 17 and the nested screw rod 1; the sealing device is used for preventing a gap from being formed between the nested screw rod 1 and the corrugated pipe 3; the sealing performance of the nested screw rod 1 and the corrugated pipe 3 is influenced; the driving round plate 17 has the function that when the corrugated pipe 3 is nested on the nesting screw rod 1, the driving round plate 17 can push the extrusion spring 4 to compress the extrusion spring 4 under the driving of the corrugated pipe 3; as shown in fig. 13, a limiting circular plate 16 is mounted at the other end of the connecting pipe 12, and as shown in fig. 13 and 14, the limiting circular plate 16 is matched with a limiting plate 22 mounted at the inner side of the sliding shell 5; the stopper disc 16 is used to restrict the stopper disc 16, that is, the bellows 3, in the moving direction of the outer side of the mounting case 2 by the stopper plate 22.

As shown in fig. 15, the first gear 24 is mounted on the second output shaft 28 of the differential 14, as shown in fig. 7 and 16, the fixed support 23 is mounted in the slide case 5, as shown in fig. 16, the toothed ring 25 is mounted on one side of the fixed support 23 by a rotational fit, as shown in fig. 15, the toothed ring 25 has teeth uniformly distributed on the outer circumferential surface thereof, as shown in fig. 12, the toothed ring 25 has helical teeth on the inner circumferential surface thereof, and as shown in fig. 12, the toothed ring 25 is engaged with the first gear 24 by the teeth on the outer circumferential surface thereof; as shown in fig. 21, three fourth rotating shafts 41 are respectively mounted on the fixed support 23 through two symmetrically distributed fourth supports 42, and three second driving gears 43 are respectively mounted on the three fourth rotating shafts 41; as shown in fig. 22, the outer circumferential surface of the second driving gear 43 is uniformly provided with a plurality of driving teeth 38 in the circumferential direction, the second driving gear 43 is uniformly provided with a plurality of arc-shaped tooth grooves 37 in the circumferential direction on the driving teeth 38 uniformly distributed in the circumferential direction, the second driving gear 43 is engaged with the helical teeth on the toothed ring 25 through the uniformly distributed arc-shaped tooth grooves 37, and the driving teeth 38 uniformly distributed on the second driving gear 43 are engaged with the corrugated teeth on the outer circumferential surface of the corrugated pipe 3; when the first gear 24 rotates, the first gear 24 will drive the gear ring 25 engaged with the first gear to rotate, the gear ring 25 will drive the three second driving gears 43 engaged with the second gear through the helical teeth and the arc-shaped tooth slots 37 to rotate, and the three second driving gears 43 will drive the bellows 3 to move through the driving teeth 38 thereon.

As shown in fig. 19, the fixed support 23 is provided with a trapezoidal ring groove 39, as shown in fig. 20, one side of the toothed ring 25 is provided with a trapezoidal ring block 40, as shown in fig. 16, the toothed ring 25 is arranged on one side of the fixed support 23 through the matching of the trapezoidal ring block 40 and the trapezoidal ring groove 39.

As shown in fig. 6, the sliding shell 5 is provided with a pressing plate 11, the pressing plate 11 is matched with the nesting screw rod 1, and the pressing plate 11 is used for pushing the nesting screw rod 1 to move through the pressing plate 11 when the sliding shell 5 moves towards the nesting screw rod 1 side; the uniform up-and-down stress of the nested screw rod 1 is ensured.

As shown in fig. 9, a hollow fixing shaft 15 is installed at one end of the nested screw rod 1 close to the pipe hole 10, and the fixing shaft 15 is installed with a fixing plate 33 as shown in fig. 16, as shown in fig. 17, three third rotating shafts 35 are installed on the fixing plate 33 through two third supports 36 which are symmetrically distributed, as shown in fig. 17, and three first driving gears 32 are installed on the three third rotating shafts 35; the first driving gear 32 and the second driving gear 43 have the same structure, as shown in fig. 16, the connecting gear 34 is mounted on the fixed shaft 15, as shown in fig. 18, the outer circumferential surface of the connecting gear 34 is uniformly provided with a plurality of helical teeth in the circumferential direction, as shown in fig. 17, the connecting gear 34 is meshed with the arc-shaped tooth grooves 37 on the three first driving gears 32; the driving teeth 38 uniformly distributed on the first driving gear 32 are meshed with the corrugated teeth on the inner circular surface of the corrugated pipe 3; when the corrugated pipe 3 moves, the corrugated pipe 3 drives the three first driving gears 32 to rotate through the corrugated teeth on the corrugated pipe, the three first driving gears 32 rotate to drive the connecting gear 34 meshed with the three first driving gears to rotate, and the rotation of the connecting gear 34 ensures the rotation synchronism of the three first driving gears 32, namely the movement synchronism of the corrugated pipe 3.

The above-described solution as one fixed plate 33, one set of first driving gears 32 and one connecting gear 34 is replaced by three fixed plates 33, three sets of first driving gears 32 and three connecting gears 34.

The pressing spring 4 is a compression spring, and the nested screw rod 1 has compressibility.

The specific working process is as follows: when the tightening device designed by the invention is used, in the working process, when the corrugated pipe 3 needs to be tightened, the driving self-locking motor 7 is firstly controlled to work, and the driving self-locking motor 7 drives the input shaft of the differential 14 to rotate through the speed reducer 13; since the elastic force of the nested screw rod 1 is greater than that of the pressing spring 4 in this state, the first gear 24 is preferentially rotated by the transmission of the differential 14, when the first gear 24 rotates, the first gear 24 rotates the toothed ring 25 engaged therewith, the toothed ring 25 rotates the three second driving gears 43 engaged therewith via the helical teeth and the arc-shaped toothed grooves 37, the three second driving gears 43 rotate to drive the corrugated tube 3 to move toward the inside of the mounting case 2 to be nested on the nested screw rod 1 via the driving teeth 38 thereon, when the corrugated portion of the corrugated tube 3 completely moves into the mounting case 2, the pressing spring 4 is compressed, and the pressure of the pressing spring 4 is greater than that of the nested screw rod 1 in this state, and then the first gear 24 stops rotating by the adjustment of the differential 14, and the second gear 9 starts rotating, the second gear 9 rotates to drive the sliding shell 5 to move through the driving rack 8; the corrugated pipes 3 nested on the nested screw rod 1 are close to each other between two adjacent spiral coils on the nested screw rod 1, so that the space occupied by the corrugated pipes 3 is reduced; when the corrugated pipe 3 needs to be taken out, the self-locking motor 7 is controlled and driven to work, so that the driving motor drives the first gear 24 and the second gear 9 to reversely rotate, under the state, the sliding shell 5 can be gradually restored under the action of the nested screw rod 1, the first gear 24 can be driven to reversely rotate to gradually move out the corrugated pipe 3, and meanwhile, the extrusion spring 4 is restored to prepare next time.