CN109822656B

CN109822656B - Fixing device of plastic tubing

Info

Publication number: CN109822656B
Application number: CN201910312951.5A
Authority: CN
Inventors: 邱博
Original assignee: Hangzhou Fuyang Communication Plastic Factory
Current assignee: Shandong Senya Information Technology Co.,Ltd.
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-11-06
Anticipated expiration: 2039-04-18
Also published as: CN111958666A; CN111890448A; CN109822656A

Abstract

The invention belongs to the technical field of PE pipes, and particularly relates to a fixing device of a plastic pipe, which comprises a clamping unit and a fixing frame, wherein the clamping unit controls the distance between a second elastic arc plate and a first elastic arc plate to ensure that a clamping mechanism can be suitable for PE pipes with different diameters by adjusting the downward movement of the second elastic arc plate; on the other hand, the PE pipe is clamped in a wrapping manner by pushing the two ends of the first elastic arc plate and the second elastic arc plate, so that the first elastic arc plate and the second elastic arc plate are in surface contact with the PE pipe in the clamping process of the PE pipe, and the PE pipe is clamped more stably by the first elastic arc plate and the second elastic arc plate compared with the traditional point contact; the PE pipe cutting device has the advantages that the stability of the PE pipe in the cutting process is guaranteed, the two ends of the first elastic arc plate and the second elastic arc plate are bent to clamp the PE pipe, the upper pressure and the lower pressure of the PE pipe are reduced, and the phenomenon that the PE pipe is extruded and flattened to deform due to overlarge extrusion force and the influence on the normal use of the PE pipe is avoided.

Description

Fixing device of plastic tubing

Technical Field

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

Background

PE is polyethylene plastic, the most basic plastic, plastic bags, preservative films and the like are PE, and the PE has the excellent characteristic of resisting most of domestic and industrial chemicals; in the production of the PE pipe, the PE pipe is often required to be cut into different lengths to meet different requirements, the PE pipe is required to be clamped and fixed in the cutting process to facilitate cutting, and the conventional PE pipe clamping devices are mostly fixed in caliber and cannot clamp pipes with different calibers through one clamping device, so that the working efficiency of workers is reduced; moreover, a common clamping mechanism is clamped in a point contact type clamping manner, so that the PE pipe shakes in the cutting process, and the cutting effect is influenced; meanwhile, the point contact clamping mode easily causes the deformation of the PE pipe at the stressed part in the clamping process, and influences the normal use of the PE pipe.

The invention designs a fixing device for a plastic pipe to solve the problems.

Disclosure of Invention

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

In the description of the present invention, it should be noted that the terms "inside", "below", "upper" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention usually place when using, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A fixing device of plastic tubing characterized in that: the clamping device comprises clamping units and a fixing frame, wherein the fixing frame consists of a supporting bottom plate and two supporting vertical plates which are symmetrically distributed and fixed on the supporting bottom plate, and the two clamping units are symmetrically arranged on the fixing frame; the function of mount is to playing fixed support effect to the clamping unit.

The clamping unit comprises an upper clamping mechanism and a lower supporting mechanism, wherein the lower supporting mechanism is arranged on the supporting base plate, and the upper clamping mechanism is arranged on one of the two supporting vertical plates; the upper clamping mechanism is matched with the lower supporting mechanism.

The lower supporting mechanism comprises a first elastic arc plate, a first driving gear, a first mounting shell, a first speed reducer, a first driving motor, a first supporting plate and a first driving gear, wherein the first mounting shell is fixedly mounted on the upper side of the supporting bottom plate; the outer arc surface of the first elastic arc plate is provided with a bulge, and the first elastic arc plate is arranged on the upper side of the first mounting shell through the bulge; the first elastic arc plate has elasticity, and the elasticity of the first elastic arc plate can ensure that the two ends of the first elastic arc plate can be pushed up by the two driving rods in the process of clamping the PE pipe, so that the inner arc surface of the first elastic arc plate can be in better contact fit with the outer circular surface of the PE pipe, and the first elastic arc plate can better clamp the PE pipe; the first driving motor is arranged on the upper side surface in the first mounting shell, a signal receiver and a control switch are arranged on the first driving motor, the first speed reducer is arranged on the inner side of the first mounting shell through a first supporting plate, and an input shaft of the first speed reducer is connected with an output shaft of the first driving motor; the first driving gear is arranged on an output shaft of the first speed reducer, and the first driving gear controls two sides of the first elastic arc plate to swing upwards through transmission under the driving of the first driving motor so as to clamp the PE pipe; when the signal receiver on the first driving motor receives an electronic signal which is transmitted to the pressure sensor and can start to work, the signal receiver transmits the signal to the control switch, so that the control switch controls the first driving motor to start to work; the first driving motor outputs rotating force when starting to work, and the output rotating force drives the first driving gear to rotate through the speed reduction of the first speed reducer.

The upper clamping mechanism comprises a second driving gear, a second mounting shell, a second elastic arc plate, a second support plate, a third support plate, a second speed reducer, a second driving motor, a pressure sensor and a limiting mechanism, wherein a guide square opening is formed in the lower side surface of the second mounting shell, and the second mounting shell is fixedly mounted on one of two supporting vertical plates; the limiting mechanism is arranged in the second mounting shell; the outer arc surface of the second elastic arc plate is provided with a bulge, the second elastic arc plate is connected with the limiting mechanism through the bulge, and the bulge is matched with a guide square opening formed in the second mounting shell; the second elastic arc plate has elasticity, and the elasticity of the second elastic arc plate can ensure that the two ends of the second elastic arc plate can be pushed downwards by the two corresponding driving rods in the process of clamping the PE pipe by the first elastic arc plate and the second elastic arc plate, so that the two ends of the second elastic arc plate are bent downwards, and the inner arc surface of the second elastic arc plate can be in better contact fit with the outer arc surface of the PE pipe, so that the PE pipe can be better clamped by the second elastic arc plate; the second driving motor is installed in the second installation shell through a second support plate, the second speed reducer is installed on the inner side of the second installation shell through a third support plate, and an input shaft of the second speed reducer is connected with an output shaft of the second driving motor; the second driving gear is arranged on an output shaft of the second speed reducer and is driven by a second driving motor to control two sides of the second elastic arc plate to swing downwards through transmission so as to clamp the PE pipe; a pressure sensor is arranged on the lower side of the second elastic arc plate; the pressure sensor transmits the signal to a signal receiver on the first driving motor in an electronic induction mode after receiving the signal; the pressure sensor is a strain gauge which is designed to adapt to the pressure change of the second elastic arc plate in the process of clamping the PE pipe; meanwhile, the resistance change on the strain gauge can be transmitted out in an electronic induction mode.

The limiting mechanism comprises a telescopic rod, a trigger rack, a return spring, a fixed support, a rod sleeve, an extrusion spring, a driving plate, a trigger gear, a limiting block, a clamping groove, a telescopic rod support, a square opening, a gear fixing shaft and an avoiding inclined plane, wherein the telescopic rod consists of a telescopic outer sleeve and a telescopic inner rod; a plurality of clamping grooves are uniformly formed in the upper side and the lower side of one side face in the telescopic outer sleeve, and the clamping grooves are used for limiting the limiting block, so that the telescopic inner rod and the telescopic outer sleeve which are provided with the limiting block are locked in the downward extending direction of the telescopic inner rod; the upper end of the telescopic outer sleeve is fixedly arranged on the inner side of the second mounting shell through a telescopic rod support; the telescopic inner rod is hollow, the lower end of the telescopic inner rod is an open end, the upper end of the telescopic inner rod is nested and installed in the telescopic outer sleeve, and the lower end of the telescopic inner rod is connected with the bulge on the second elastic arc plate; a driving plate is arranged on the trigger rack, the trigger rack is arranged on the telescopic inner rod through the sliding fit of the driving plate and the inner side surface of the telescopic inner rod, and a return spring is arranged between the lower side surface of the driving plate and the upper side surface of the bulge on the second elastic arc plate; the driving plate has the advantages that the driving plate is in sliding fit with the inner side face of the telescopic inner rod to guide the trigger rack, and the driving plate can stretch the return spring in the process of moving upwards along with the trigger rack, so that the return spring has restoring force for restoring the trigger rack; two ends of the gear fixing shaft are fixedly arranged on the inner side surface of the telescopic inner rod, and the trigger gear is arranged on the gear fixing shaft; the trigger gear is meshed with the trigger rack; the upper side of one end of the limiting block is provided with an avoiding inclined plane, and the avoiding inclined plane has the function that when the limiting block is positioned in a clamping groove on the telescopic outer sleeve to limit the telescopic inner rod and the telescopic outer sleeve, the second driving gear starts to drive the second driving rack to move upwards; the two ends of the second elastic arc plate are still in a bent state in the process that the second driving rack just starts to move upwards, and the triggering rack is kept in contact with the outer circular surface of the PE pipe; the second driving rack moves upwards to drive the second push plate to move upwards; the second push plate moves upwards to drive the telescopic inner rod to move upwards; the telescopic inner rod moves upwards to drive the limiting block arranged on the telescopic inner rod to move upwards; because the telescopic outer sleeve is supported and fixed by the telescopic rod and is kept still, the trigger rack and the PE pipe are also in a contact state, namely the lower end of the trigger rack is jacked by the PE pipe and is in a static state, namely the trigger gear is also in a static state, and one end of the limiting block with the avoiding inclined plane is positioned in the clamping groove on the telescopic outer sleeve, so that in the process that the limiting block moves upwards under the driving of the telescopic inner rod, in order to prevent the limiting block from interfering with the clamping groove on the telescopic outer sleeve, the avoiding inclined plane is designed on the limiting block, and the interference between the limiting block and the clamping groove on the telescopic outer sleeve in the process that the second driving rack just starts to move; when a gap is formed between the lower end of the trigger rack and the outer circular surface of the PE pipe, the trigger rack can move downwards under the action of the return spring, and the trigger rack moves downwards to drive the limiting block to move towards one side far away from the clamping groove on the telescopic outer sleeve through the trigger gear, so that the limiting block is separated from the telescopic outer sleeve; unlocking the telescopic outer sleeve and the telescopic inner rod in the telescopic direction; the lower side surface of the limiting block is provided with teeth, the limiting block is arranged on the telescopic inner rod through the fixed support, and the limiting block is in sliding fit with the fixed support; the limiting block penetrates through a square opening formed in the telescopic inner rod and is matched with a clamping groove in the telescopic outer sleeve; the limiting block is meshed with the trigger gear through teeth on the limiting block; the limiting block is used for limiting and locking the telescopic inner rod and the telescopic outer sleeve in the direction that the telescopic inner rod moves downwards relative to the telescopic outer sleeve, and the pressure of the contact point of the second elastic arc plate and the PE pipe is basically zero; after the lower end of the trigger rack is connected with the PE pipe, the trigger rack moves upwards under the driving force of the PE pipe, the trigger rack moves upwards to drive the trigger gear to rotate, the trigger gear rotates to drive the limiting block to move towards one side of the clamping groove on the telescopic outer sleeve, the limiting block is in nested fit with the corresponding clamping groove, and the telescopic inner rod provided with the limiting block is locked with the telescopic outer sleeve through the limiting block; when the lower end of the trigger rack is separated from the PE pipe, the trigger rack moves downwards under the action of the return spring, and the trigger rack moves downwards to drive the limiting block to move towards one side far away from the clamping groove in the telescopic outer sleeve through the trigger gear, so that the limiting block is separated from the telescopic outer sleeve; unlocking the telescopic outer sleeve and the telescopic inner rod in the telescopic direction; a rod sleeve is arranged at the lower end of the trigger rack through the matching of the guide block and the guide groove, and an extrusion spring is arranged between the bottom surface of the inner side of the rod sleeve and the lower side surface of the trigger rack; the rod sleeve cannot be separated from the trigger rack; the lower end of the rod sleeve penetrates through an avoidance guide groove formed in the second elastic arc plate, and the rod sleeve is in sliding fit with the avoidance guide groove formed in the second elastic arc plate; the rod sleeve has the function of preventing the second elastic arc plate from being clamped relative to the PE pipe due to the fact that the limiting block cannot be correspondingly matched with the clamping groove in the telescopic outer sleeve in the downward moving process, the PE pipe cannot be continuously moved downwards to clamp the PE pipe, when the second elastic arc plate moves downwards, the second elastic arc plate can drive the telescopic inner rod to move downwards relative to the telescopic outer sleeve, when the rod sleeve at the lower end of the trigger rack is connected with the PE pipe in the moving process, the rod sleeve can push the trigger rack to move upwards through the extrusion spring, the trigger rack can drive the limiting block to move towards one side, provided with the clamping groove, of the telescopic outer sleeve through the trigger gear in the upward moving process, if the limiting block is driven by the telescopic inner rod to move downwards at the moment and just corresponds to one of the clamping grooves in the telescopic outer sleeve, the limiting block can be inserted into the corresponding clamping groove under the driving of the trigger rack, the telescopic inner rod and the telescopic outer sleeve are locked in the direction that the telescopic inner rod moves downwards relative to the telescopic outer sleeve, if the position of the limiting block which moves downwards under the driving of the telescopic inner rod at the moment is just corresponding to the interval cambered surface between two adjacent clamping grooves on the telescopic outer sleeve, the limiting block can be blocked by the cambered surface when moving towards one side of the clamping groove on the telescopic outer sleeve, the limiting block can not move transversely, the limiting block is in a static state relative to the telescopic outer sleeve, the trigger gear meshed with the limiting block is also static relative to the limiting block, the trigger rack meshed with the trigger gear is static relative to the trigger gear when the trigger gear is static, namely the trigger rack is static relative to the telescopic inner rod provided with the trigger gear, if the lower end of the trigger rack is in direct rigid contact with the PE pipe at the moment, the trigger rack is static relative to the PE pipe, namely, therefore, the rod sleeve is designed, the rod sleeve can move upwards relative to the trigger rack, and in this state, after the lower end of the rod sleeve is connected with the PE pipe, the rod sleeve can move upwards relative to the trigger rack, namely the telescopic inner rod can continuously move downwards relative to the PE pipe, and the second elastic arc plate can continuously move downwards to clamp the PE pipe.

As a further improvement of the technology, the upper side of the first mounting shell is provided with two symmetrical first sliding chutes; the sliding groove is used for providing a transverse moving space for the driving rod in the transverse moving process relative to the pushing block; two symmetrical T-shaped sliding grooves are formed in the outer arc surface of the first elastic arc plate; the first driving rack is supported and installed in the first installation shell through the first rack, and the first driving rack is meshed with the first driving gear; the first push plate is arranged on the upper side of the first driving rack; the upper side surface of each first pushing block is provided with a driving inclined plane groove, and the two first pushing blocks are symmetrically arranged at two ends of the upper side of each first pushing plate; the first driving gear rotates to drive the first driving rack to move upwards, and the first driving rack moves upwards to push the two first push blocks to move upwards through the first push plate.

The two first push blocks are connected with the first elastic arc plate in the same structure, and for any one of the first push blocks, the triangular slide block is arranged on the first push block in a sliding fit manner and cannot be separated from the first push block; the inclined plane on the triangular sliding block is matched with the inclined plane in the groove of the driving inclined plane on the first pushing block; the first push block can only vertically move upwards under the driving of the first push plate, and in order to prevent the first push block from interfering with the triangular slide block in the vertical direction in the upward movement process, the driving inclined plane groove is designed, and the inclined plane on the driving inclined plane groove is matched with the inclined plane on the triangular slide block, so that the triangular slide block transversely moves along the corresponding inclined plane relative to the first push block in the vertical upward movement process of the first push block, and cannot interfere with the first push block; a buffer spring which cannot be bent is arranged between the triangular sliding block and the driving inclined plane groove; the buffer spring plays a role in resetting the triangular sliding block; the lower end of the driving rod is arranged on the upper side of the triangular sliding block, and the upper end of the driving rod is fixedly provided with a rolling shaft; the rolling shaft is in sliding fit with a T-shaped arc groove formed in the first elastic arc plate; the roller bearing can promote first elasticity arc board rebound on the one hand, and on the other hand can prevent through the sliding fit of roller bearing and T shape arc groove that the triangle slider can not take place to interfere with first elasticity arc board when relative first ejector pad sideslip.

As a further improvement of the technology, two sides of the driving inclined plane groove formed on the first push block are symmetrically provided with two guide grooves, two sides of the triangular slide block are symmetrically provided with two guide blocks, the triangular slide block is arranged on the first push block through the matching of the two guide blocks and the two guide grooves, and the guide blocks and the guide grooves bring a guide effect to the triangular slide block; the inclination angles between the two guide grooves and the lower side surface of the first push block are the same as the inclination angle between the inclined plane of the driving inclined plane groove and the lower side surface of the first push block; the triangular sliding block is ensured not to interfere with the first push block in the process of moving transversely relative to the first push block.

As a further improvement of the technology, the above alternative scheme as that the roller is fixedly installed on the driving rod is that the roller is installed on the driving rod through a shaft sleeve, the shaft sleeve and the driving rod are fixedly installed, and the roller is installed on the shaft sleeve through a bearing; the rolling shaft is matched with a T-shaped arc groove formed in the first elastic arc plate in a rolling way; the friction between the rolling shaft and the T-shaped arc groove can be reduced through the rolling fit, and the triangular sliding block can be guaranteed to move transversely relative to the first push block smoothly.

As the further improvement of this technique, four division boards that prevent buffer spring and bend are installed in above-mentioned buffer spring's the outside, and the one end fixed mounting of four division boards is on the triangle slider, and the other end of four division boards passes first ejector pad and is located the first ejector pad outside, and the effect of division board prevents that buffer spring from bending, influences the normal reset of triangle slider.

As a further improvement of the technology, the lower side of the second mounting shell is provided with two symmetrical second sliding chutes; two symmetrical T-shaped sliding grooves are formed in the outer arc surface of the second elastic arc plate; the second driving rack is supported and installed in the second installation shell through the second rack, and the second driving rack is meshed with the second driving gear; one end of the U-shaped connecting plate, which is back to the U-shaped opening, is arranged on the lower side of the second driving rack; the second push plate is arranged on the lower side of the U-shaped connecting plate; a return spring is arranged between the second push plate and the second elastic arc plate and nested outside the telescopic rod; the upper side surfaces of the second push blocks are provided with driving inclined plane grooves, and the two second push blocks are symmetrically arranged at two ends of the lower side of the second push plate; the connection mode between the two second push blocks and the second elastic arc plate is the same as the connection mode between the two first push blocks and the first elastic arc plate.

As a further improvement of the technology, the second push plate is provided with a square guide opening avoiding the telescopic outer sleeve.

As a further improvement of the technology, the inner side of the telescopic outer sleeve is provided with two symmetrical square guide grooves, two sides of the upper end of the telescopic inner rod are symmetrically provided with two square guide blocks, and the upper end of the telescopic inner rod is arranged in the telescopic outer sleeve through the matching of the two square guide blocks and the square guide grooves.

As a further improvement of this technique, the above-mentioned buffer spring is always in a compressed state.

As a further improvement of the present technology, the return spring is a compression spring; the return spring is an extension spring; the compression spring is a compression spring.

Compared with the traditional PE pipe technology, the clamping device designed by the invention can be used for adapting to PE pipes with different diameters by adjusting the downward movement of the second elastic arc plate and controlling the distance between the second elastic arc plate and the first elastic arc plate, so that the clamping mechanism can be suitable for the PE pipes with different diameters; on the other hand, the PE pipe is clamped in a wrapping manner by pushing the two ends of the first elastic arc plate and the second elastic arc plate, so that the first elastic arc plate and the second elastic arc plate are in surface contact with the PE pipe in the clamping process of the PE pipe, and the PE pipe is clamped more stably by the first elastic arc plate and the second elastic arc plate compared with the traditional point contact; the PE pipe cutting device has the advantages that the stability of the PE pipe in the cutting process is guaranteed, the two ends of the first elastic arc plate and the second elastic arc plate are bent to clamp the PE pipe, the upper pressure and the lower pressure of the PE pipe are reduced, and the phenomenon that the PE pipe is extruded and flattened to deform due to overlarge extrusion force and the influence on the normal use of the PE pipe is avoided.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic view of the structure of the fixing frame.

Fig. 4 is a schematic plan view of the structure of the clamping unit.

Fig. 5 is a structural distribution schematic diagram of the clamping units.

Fig. 6 is a schematic structural view of the lower support mechanism.

Fig. 7 is a schematic plan view of the lower support mechanism.

Fig. 8 is a structural schematic view of the first mounting case.

Fig. 9 is a schematic distribution diagram of the internal structure of the first mounting shell.

Fig. 10 is a schematic view of the first drive gear installation.

Figure 11 is a first push plate installation schematic.

Fig. 12 is a schematic view of the connection of the first elastic arc plate and the first push block.

Fig. 13 is a drive rod mounting schematic.

Fig. 14 is a schematic view of a first elastic arc plate structure.

Fig. 15 is a schematic structural view of the first push block.

Fig. 16 is a roller mounting schematic.

Fig. 17 is a schematic plan view of the upper clamping mechanism.

Fig. 18 is a schematic structural view of the upper clamping mechanism.

Fig. 19 is a structural schematic view of a second mounting housing.

Fig. 20 is a schematic view of the distribution of the internal structure of the second mounting case.

Fig. 21 is a second drive gear installation schematic.

Figure 22 is a second push plate mounting schematic.

Figure 23 is a schematic view of the telescoping pole installation.

Fig. 24 is a schematic view of the stop mechanism installation.

Fig. 25 is a schematic view of the connection of the second elastic arc plate and the second push block.

Fig. 26 is a schematic sectional plan view of the structure of the limiting mechanism.

Fig. 27 is a schematic view of the installation of the structure of the limiting mechanism.

Fig. 28 is a schematic view of the structure of the telescopic jacket.

Fig. 29 is a schematic view of a telescopic inner rod.

Figure 30 is a schematic view of the sleeve installation.

FIG. 31 is a schematic view of stopper installation.

Number designation in the figures: 1. a clamping unit; 2. a fixed mount; 3. a support vertical plate; 4. a support base plate; 5. an upper clamping mechanism; 6. a lower support mechanism; 7. a first elastic arc plate; 8. a first drive gear; 9. a drive rod; 10. a first drive rack; 11. a first mounting case; 12. a first chute; 13. a first push block; 14. a first rack support; 15. a first decelerator; 16. a first drive motor; 17. a first support plate; 18. a first push plate; 19. a triangular slider; 20. a buffer spring; 21. a roller; 22. a T-shaped chute; 23. a guide groove; 24. driving the inclined plane groove; 25. a guide block; 26. a second drive rack; 27. a second drive gear; 28. a second mounting case; 29. a second elastic arc plate; 30. guiding the square opening; 31. a second chute; 32. a second rack support; 33. the telescopic rod supports; 34. a second support plate; 35. a third support plate; 36. a second decelerator; 37. a second drive motor; 38. a U-shaped connecting plate; 39. a square guide port; 40. a second push plate; 41. a pressure sensor; 42. a limiting mechanism; 43. a telescopic rod; 44. a return spring; 45. a second push block; 46. avoiding a guide groove; 47. a telescopic outer sleeve; 48. triggering the rack; 49. a return spring; 50. fixing and supporting; 51. a rod sleeve; 52. a compression spring; 53. a drive plate; 54. triggering a gear; 55. a limiting block; 56. a telescopic inner rod; 57. a card slot; 58. a square guide groove; 59. a square guide block; 60. a square opening; 61. a gear fixing shaft; 62. avoiding the inclined plane.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, the clamping device comprises clamping units 1 and a fixed frame 2, wherein as shown in fig. 3, the fixed frame 2 is composed of a supporting base plate 4 and two symmetrically distributed supporting vertical plates 3 fixed on the supporting base plate 4, and as shown in fig. 1, the two clamping units 1 are symmetrically installed on the fixed frame 2; the fixing frame 2 functions as a fixing support 50 for the clamping unit 1.

As shown in fig. 4 and 5, the clamping unit 1 comprises an upper clamping mechanism 5 and a lower supporting mechanism 6, wherein as shown in fig. 1, the lower supporting mechanism 6 is mounted on a supporting base plate 4, and the upper clamping mechanism 5 is mounted on one of two supporting risers 3; the upper clamping mechanism 5 cooperates with the lower support mechanism 6.

As shown in fig. 6 and 7, the lower support mechanism 6 includes a first elastic arc plate 7, a first driving gear 8, a first mounting shell 11, a first speed reducer 15, a first driving motor 16, a first support plate 17, and a first driving gear 8, wherein as shown in fig. 1, the first mounting shell 11 is fixedly mounted on the upper side of the support base plate 4; as shown in fig. 14, the first elastic arc plate 7 has a protrusion on its outer arc surface, and as shown in fig. 6, the first elastic arc plate 7 is mounted on the upper side of the first mounting case 11 by the protrusion; the first elastic arc plate 7 has elasticity, and the elasticity of the first elastic arc plate 7 can ensure that the two ends of the first elastic arc plate 7 can be pushed up by the two driving rods 9 in the process of clamping the PE pipe by the first elastic arc plate 7, so that the inner arc surface of the first elastic arc plate 7 can be in better contact fit with the outer arc surface of the PE pipe, and the PE pipe can be better clamped by the first elastic arc plate 7; as shown in fig. 6, a first driving motor 16 is installed on the inner upper side surface of the first installation case 11, the first driving motor 16 is provided with a signal receiver and a control switch, a first decelerator 15 is installed inside the first installation case 11 through a first support plate 17, and as shown in fig. 10, an input shaft of the first decelerator 15 is connected with an output shaft of the first driving motor 16; the first driving gear 8 is mounted on an output shaft of the first speed reducer 15, and as shown in fig. 9, the first driving gear 8 is driven by the first driving motor 16 to control two sides of the first elastic arc plate 7 to swing upwards through transmission so as to clamp the PE pipe; when the signal receiver on the first driving motor 16 receives the electronic signal transmitted to the pressure sensor 41, the electronic signal can start to work, and the signal receiver transmits the signal to the control switch, so that the control switch controls the first driving motor 16 to start to work; the first driving motor 16 is operated to output a rotational force, and the output rotational force drives the first driving gear 8 to rotate by being decelerated by the first decelerator 15.

As shown in fig. 17 and 18, the upper clamping mechanism 5 includes a second driving gear 27, a second mounting shell 28, a second elastic arc plate 29, a second supporting plate 34, a third supporting plate 35, a second speed reducer 36, a second driving motor 37, a pressure sensor 41, and a limiting mechanism 42, wherein as shown in fig. 19, a guiding square opening 30 is formed on the lower side surface of the second mounting shell 28, and as shown in fig. 1, the second mounting shell 28 is fixedly mounted on one of the two supporting risers 3; as shown in fig. 18, the limiting mechanism 42 is mounted in the second mounting case 28; as shown in fig. 25, the second elastic arc plate 29 has a protrusion on its outer arc surface, as shown in fig. 20 and 23, the second elastic arc plate 29 is connected to the limiting mechanism 42 through the protrusion, and the protrusion is engaged with the guiding square opening 30 formed on the second mounting shell 28; the second elastic arc plate 29 has elasticity, and the elasticity of the second elastic arc plate 29 can ensure that the two ends of the second elastic arc plate 29 can be pushed downwards by the two corresponding driving rods 9 in the process of clamping the PE pipe by the first elastic arc plate and the second elastic arc plate, so that the two ends of the second elastic arc plate 29 are bent downwards, the inner arc surface of the second elastic arc plate 29 can be in better contact fit with the outer circular surface of the PE pipe, and the second elastic arc plate 29 can better clamp the PE pipe; as shown in fig. 18, the second driving motor 37 is mounted in the second mounting case 28 through the second support plate 34, the second decelerator 36 is mounted inside the second mounting case 28 through the third support plate 35, and as shown in fig. 21, an input shaft of the second decelerator 36 is connected to an output shaft of the second driving motor 37; the second driving gear 27 is mounted on the output shaft of the second reducer 36, and as shown in fig. 20, the second driving gear 27 is driven by the second driving motor 37 to control the two sides of the second elastic arc plate 29 to swing downwards through transmission, so as to clamp the PE pipe; as shown in fig. 23, a pressure sensor 41 is installed on the lower side of the second elastic arc plate 29; after receiving the signal, the pressure sensor transmits the signal to a signal receiver on the first driving motor 16 in an electronic induction manner; the pressure sensor in the invention is a strain gauge which is designed to adapt to the pressure change of the second elastic arc plate 29 in the process of clamping the PE pipe; meanwhile, the resistance change on the strain gauge can be transmitted out in an electronic induction mode.

As shown in fig. 24, the limiting mechanism 42 includes an expansion link 43, a trigger rack 48, a return spring 49, a fixed support 50, a link sleeve 51, an extrusion spring 52, a driving plate 53, a trigger gear 54, a limiting block 55, a slot 57, an expansion link support 33, a square opening 60, a gear fixing shaft 61, and an avoiding inclined surface 62, wherein as shown in fig. 27, the expansion link 43 is composed of an expansion outer sleeve 47 and an expansion inner rod 56; as shown in fig. 28, a plurality of slots 57 are uniformly formed in a side surface inside the telescopic outer sleeve 47 up and down, and the slots 57 are used for limiting the limiting block 55, so that the telescopic inner rod 56 provided with the limiting block 55 and the telescopic outer sleeve 47 are locked in a direction in which the telescopic inner rod 56 extends downwards; the upper end of the telescopic jacket 47 is fixedly arranged on the inner side of the second mounting shell 28 through the telescopic rod support 33; as shown in fig. 29, the telescopic inner rod 56 is hollow, the lower end of the telescopic inner rod 56 is an open end, the upper end of the telescopic inner rod 56 is nested in the telescopic outer sleeve 47, as shown in fig. 23, the lower end of the telescopic inner rod 56 is connected with the protrusion on the second elastic arc plate 29; as shown in fig. 30, a driving plate 53 is mounted on the trigger rack 48, as shown in fig. 27, the trigger rack 48 is mounted on the telescopic inner rod 56 by the sliding fit of the driving plate 53 and the inner side surface of the telescopic inner rod 56, and a return spring 49 is mounted between the lower side surface of the driving plate 53 and the upper side surface of the protrusion on the second elastic arc plate 29; the driving plate 53 has the effects that the driving plate 53 is in sliding fit with the inner side surface of the telescopic inner rod 56 to guide the trigger rack 48, and the driving plate 53 can stretch the return spring 49 in the process of moving upwards along with the trigger rack 48, so that the return spring 49 has restoring force for restoring the trigger rack 48; as shown in fig. 23, both ends of the gear fixing shaft 61 are fixedly installed on the inner side surface of the telescopic inner rod 56, and as shown in fig. 31, the trigger gear 54 is installed on the gear fixing shaft 61; the trigger gear 54 is engaged with the trigger rack 48; an avoiding inclined surface 62 is arranged on the upper side of one end of the limiting block 55, and the avoiding inclined surface 62 has the function that when the limiting block 55 is positioned in the clamping groove 57 on the telescopic outer sleeve 47 to limit the telescopic inner rod 56 and the telescopic outer sleeve 47, the second driving gear 27 starts to drive the second driving rack 26 to move upwards; in the process that the second driving rack 26 just starts to move upwards, the two ends of the second elastic arc plate 29 are still in a bent state, and the trigger rack 48 keeps contact with the outer circular surface of the PE pipe; the upward movement of the second drive rack 26 causes the second push plate 40 to move upward; the second push plate 40 moves upwards to drive the telescopic inner rod 56 to move upwards; the upward movement of the telescopic inner rod 56 drives the limiting block 55 mounted on the telescopic inner rod to move upward; because the telescopic jacket 47 is fixedly kept still by the telescopic rod support 33, the trigger rack 48 and the PE pipe are also in a contact state, namely the lower end of the trigger rack 48 is in a static state by being pushed against the PE pipe, namely the trigger gear 54 is also in a static state, and one end of the limiting block 55 with the avoiding inclined plane 62 is positioned in the clamping groove 57 on the telescopic jacket 47, so that in the process that the limiting block 55 moves upwards under the drive of the telescopic inner rod 56, in order to prevent the limiting block 55 from interfering with the clamping groove 57 on the telescopic jacket 47, the avoiding inclined plane 62 is designed on the limiting block 55, and the interference between the limiting block 55 and the clamping groove 57 on the telescopic jacket 47 in the process that the second driving rack 26 just starts to move upwards is prevented by the avoiding inclined plane 62; when a gap is formed between the lower end of the trigger rack 48 and the outer circular surface of the PE pipe, the trigger rack 48 moves downwards under the action of the return spring 49, and the trigger rack 48 moves downwards to drive the limiting block 55 to move towards one side far away from the clamping groove 57 on the telescopic outer sleeve 47 through the trigger gear 54, so that the limiting block 55 is separated from the telescopic outer sleeve 47; the telescopic outer sleeve 47 and the telescopic inner rod 56 are unlocked in the telescopic direction; as shown in fig. 31, the lower side surface of the limiting block 55 has teeth, the limiting block 55 is mounted on the telescopic inner rod 56 through the fixed support 50, and the limiting block 55 is in sliding fit with the fixed support 50; the limiting block 55 penetrates through a square opening 60 formed in the telescopic inner rod 56 and is matched with a clamping groove 57 in the telescopic outer sleeve 47; the limiting block 55 is meshed with the trigger gear 54 through teeth on the limiting block; the limiting block 55 is used for limiting and locking the telescopic inner rod 56 and the telescopic outer sleeve 47 in the direction that the telescopic inner rod 56 moves downwards relative to the telescopic outer sleeve 47, so that the pressure of the contact point of the second elastic arc plate 29 and the PE pipe is basically zero; after the lower end of the trigger rack 48 is connected with the PE pipe, the trigger rack 48 moves upwards under the pushing force of the PE pipe, the trigger rack 48 moves upwards to drive the trigger gear 54 to rotate, the trigger gear 54 rotates to drive the limiting block 55 to move towards one side of the clamping groove 57 on the telescopic outer sleeve 47, so that the limiting block 55 is in nested fit with the corresponding clamping groove 57, and the telescopic inner rod 56 provided with the limiting block 55 is locked with the telescopic outer sleeve 47; after the lower end of the trigger rack 48 is separated from the PE pipe, the trigger rack 48 moves downwards under the action of the return spring 49, and the trigger rack 48 moves downwards to drive the limiting block 55 to move towards one side away from the clamping groove 57 on the telescopic outer sleeve 47 through the trigger gear 54, so that the limiting block 55 is separated from the telescopic outer sleeve 47; the telescopic outer sleeve 47 and the telescopic inner rod 56 are unlocked in the telescopic direction; as shown in fig. 26, a rod sleeve 51 is mounted at the lower end of the trigger rack 48 through the cooperation of the guide block and the guide groove, and a pressing spring 52 is mounted between the bottom surface of the inner side of the rod sleeve 51 and the lower side surface of the trigger rack 48; the lever sleeve 51 does not disengage the trigger rack 48; as shown in fig. 24 and 25, the lower end of the rod sleeve 51 passes through the avoidance guide groove 46 formed on the second elastic arc plate 29, and the rod sleeve 51 is in sliding fit with the avoidance guide groove 46 formed on the second elastic arc plate 29; the rod sleeve 51 is used for preventing the second elastic arc plate 29 from being clamped tightly relative to the PE pipe because the limiting block 55 and the clamping groove 57 on the telescopic outer sleeve 47 cannot be correspondingly matched in the downward moving process, the PE pipe cannot be clamped continuously by moving downward, when the second elastic arc plate 29 moves downward, the second elastic arc plate 29 drives the telescopic inner rod 56 to move downward relative to the telescopic outer sleeve 47, in the moving process, after the rod sleeve 51 at the lower end of the trigger rack 48 is connected with the PE pipe, the rod sleeve 51 pushes the trigger rack 48 to move upward through the extrusion spring 52, the trigger rack 48 moves upward and drives the limiting block 55 to move towards the side, where the clamping groove 57 is formed, on the telescopic outer sleeve 47 through the trigger gear 54, and if the position, where the limiting block 55 moves downward under the driving of the telescopic rack 56 at the moment, is exactly corresponding to one clamping groove 57 of the plurality of clamping grooves 57 on the telescopic outer sleeve 47, the limiting block 55 is driven by the trigger rack 48 to be inserted into the corresponding slot 57, so that the telescopic inner rod 56 and the telescopic outer sleeve 47 are locked in the direction in which the telescopic inner rod 56 moves downwards relative to the telescopic outer sleeve 47, if the limiting block 55 is driven by the telescopic inner rod 56 to move downwards at a position just corresponding to the spaced arc surface between two adjacent slots 57 on the telescopic outer sleeve 47, the limiting block 55 is clamped by the arc surface when moving towards one side of the slot 57 on the telescopic outer sleeve 47, the limiting block 55 cannot move transversely, the limiting block 55 is in a stationary state relative to the telescopic outer sleeve 47, the trigger gear 54 engaged with the limiting block 55 is also stationary relative to the limiting block 55, the trigger rack 48 engaged with the trigger gear 54 is stationary relative to the trigger gear 54 when the trigger gear 54 is stationary, that is, the trigger rack 48 is stationary relative to the telescopic inner rod 56 on which the trigger gear 54 is mounted, if the lower end of the trigger rack 48 is in direct rigid contact with the PE pipe, the trigger rack 48 will be relatively stationary with respect to the PE pipe, that is, the telescopic inner rod 56 will be stationary with respect to the PE pipe, so by designing the rod sleeve 51, the rod sleeve 51 can move upward with respect to the trigger rack 48, and in this state, after the lower end of the rod sleeve 51 is in contact with the PE pipe, the rod sleeve 51 will move upward with respect to the trigger rack 48, that is, the telescopic inner rod 56 can continue to move downward with respect to the PE pipe, and the second elastic arc plate 29 can continue to move downward to clamp the PE pipe.

In summary, the following steps:

the beneficial effects of the design of the invention are as follows: on one hand, the clamping device controls the distance between the second elastic arc plate 29 and the first elastic arc plate 7 to adapt to PE pipes with different diameters by adjusting the downward movement of the second elastic arc plate 29, so that the clamping mechanism can be suitable for the PE pipes with different diameters; on the other hand, the PE pipe is clamped in a wrapping manner by pushing the two ends of the first elastic arc plate 7 and the second elastic arc plate 29, so that the first elastic arc plate 7, the second elastic arc plate 29 and the PE pipe are in surface contact in the clamping process of the PE pipe, and the clamping of the first elastic arc plate 7 and the second elastic arc plate 29 on the PE pipe is more stable compared with the traditional point contact; the stability of the PE pipe in the cutting process is guaranteed, the two ends of the first elastic arc plate 7 and the second elastic arc plate 29 are bent to clamp the PE pipe, the upper pressure and the lower pressure of the PE pipe are reduced, and the phenomenon that the PE pipe is squeezed to be flat and further deformed due to overlarge extrusion force and the normal use of the PE pipe is influenced is avoided.

As shown in fig. 8, two symmetrical first sliding grooves 12 are formed on the upper side of the first mounting housing 11; the first sliding groove is used for providing a transverse moving space for the driving rod 9 in the transverse moving process relative to the push block; as shown in fig. 14, two symmetrical T-shaped sliding grooves 22 are formed on the outer arc surface of the first elastic arc plate 7; as shown in fig. 6 and 11, the first driving rack 10 is mounted in the first mounting case 11 through the first rack support 14, and as shown in fig. 9, the first driving rack 10 is engaged with the first driving gear 8; as shown in fig. 11, the first push plate 18 is mounted on the upper side of the first drive rack 10; as shown in fig. 15, the upper side surface of the first push block 13 is provided with a driving inclined plane groove 24, and the two first push blocks 13 are symmetrically arranged at two ends of the upper side of the first push plate 18; the first driving gear 8 rotates to drive the first driving rack 10 to move upwards, and the first driving rack 10 moves upwards to push the two first push blocks 13 to move upwards through the first push plate 18.

As shown in fig. 12 and 13, the two first pushing blocks 13 and the first elastic arc plate 7 are connected in the same structure, and as for any one of the first pushing blocks 19, as shown in fig. 13, the triangular sliding block 19 is installed on the first pushing block 13 in a sliding fit manner, and the triangular sliding block 19 cannot be separated from the first pushing block 13; the inclined plane on the triangular sliding block 19 is matched with the inclined plane in the driving inclined plane groove 24 on the first push block 13; because the first push block 13 can only move vertically upwards under the driving of the first push plate 18, and in order to prevent the first push block 13 from interfering with the triangular slide block 19 in the vertical direction in the upward movement process, the driving inclined plane groove 24 is designed in the invention, and the inclined plane on the driving inclined plane groove 24 is matched with the inclined plane on the triangular slide block 19, so that the triangular slide block 19 moves transversely along the corresponding inclined plane relative to the first push block 13 in the vertical upward movement process of the first push block 13, and cannot interfere with the first push block 13; as shown in fig. 12, a buffer spring 20 that does not bend is mounted between the triangular slider 19 and the driving slope groove 24; the buffer spring 20 plays a role in resetting the triangular sliding block 19; as shown in fig. 16, the lower end of the driving rod 9 is mounted on the upper side of the triangular slider 19, and the upper end of the driving rod 9 is fixedly mounted with a roller 21; as shown in fig. 13, the roller 21 is slidably engaged with the T-shaped arc groove formed on the first elastic arc plate 7; the roller 21 can push the first elastic arc plate 7 to move upwards, and on the other hand, the sliding fit between the roller 21 and the T-shaped arc groove can prevent the triangular slider 19 from interfering with the first elastic arc plate 7 when traversing relative to the first push block 13.

As shown in fig. 15, two guide grooves 23 are symmetrically formed on two sides of the driving inclined groove 24 formed on the first push block 13, as shown in fig. 16, two guide blocks 25 are symmetrically installed on two sides of the triangular slider 19, as shown in fig. 13, the triangular slider 19 is installed on the first push block 13 by the cooperation of the two guide blocks 25 and the two guide grooves 23, and the guide blocks 25 and the guide grooves 23 bring a guiding effect to the triangular slider 19; the inclination angle between the two guide grooves 23 and the lower side surface of the first push block 13 is the same as the inclination angle between the inclined surface of the driving inclined surface groove 24 and the lower side surface of the first push block 13; the triangular sliding block 19 is ensured not to interfere with the first push block 13 in the process of moving transversely relative to the first push block 13.

As shown in fig. 16, the above-mentioned alternative as that the roller 21 is fixedly installed on the driving rod 9 is that the roller 21 is installed on the driving rod 9 through a shaft sleeve, the shaft sleeve is fixedly installed with the driving rod 9, and the roller 21 is installed on the shaft sleeve through a bearing; the rolling shaft 21 is matched with a T-shaped arc groove formed on the first elastic arc plate 7 in a rolling way; the rolling fit can reduce the friction between the rolling shaft 21 and the T-shaped arc groove, and ensure that the triangular sliding block 19 can smoothly and transversely move relative to the first push block 13.

Four isolation plates for preventing the buffer spring 20 from being bent are installed on the outer side of the buffer spring 20, one ends of the four isolation plates are fixedly installed on the triangular sliding block 19, the other ends of the four isolation plates penetrate through the first pushing block 13 and are located on the outer side of the first pushing block 13, and the isolation plates are used for preventing the buffer spring 20 from being bent and influencing the normal resetting of the triangular sliding block 19.

As shown in fig. 19, two symmetrical second sliding grooves 31 are formed on the lower side of the second mounting shell 28; the outer arc surface of the second elastic arc plate 29 is provided with two symmetrical T-shaped sliding grooves 22; a second drive rack 26 is mounted in the second mounting housing 28 by a second rack support 32, the second drive rack 26 being in meshing engagement with the second drive gear 27; one end of the U-shaped connecting plate 38, which is back to the U-shaped opening, is arranged at the lower side of the second driving rack 26; the second push plate 40 is mounted on the lower side of the U-shaped connecting plate 38; a return spring 44 is arranged between the second push plate 40 and the second elastic arc plate 29, and the return spring 44 is nested outside the telescopic rod 43; the upper side surface of the second push block 45 is provided with a driving inclined plane groove 24, and the two second push blocks 45 are symmetrically arranged at two ends of the lower side of the second push plate 40; the two second pushing blocks 45 are connected with the second elastic arc plate 29 in the same way as the two first pushing blocks 13 are connected with the first elastic arc plate 7.

As shown in fig. 22, the second push plate 40 is provided with a square guide opening 39 for avoiding the telescopic housing.

As shown in fig. 28, two symmetrical square guide grooves 58 are formed inside the telescopic outer sleeve 47, as shown in fig. 29, two square guide blocks 59 are symmetrically installed on both sides of the upper end of the telescopic inner rod 56, and as shown in fig. 27, the upper end of the telescopic inner rod 56 is installed inside the telescopic outer sleeve 47 through the cooperation of the two square guide blocks 59 and the square guide grooves 58.

The buffer spring 20 is always in a compressed state.

The return spring 44 is a compression spring; the return spring 49 is an extension spring; the pressing spring 52 is a compression spring.

The specific working process is as follows: when the clamping device designed by the invention is used, the PE pipe is firstly placed on the lower supporting mechanism 6; then, the second driving motor 37 is controlled to work, the second driving motor 37 works to drive the second driving rack 26 to move downwards through the second driving gear 27, the second driving rack 26 moves downwards to drive the second elastic arc plate 29 to move downwards, in the moving process, after the triggering rack 48 arranged on the telescopic inner rod 56 is connected with the PE pipe, the triggering rack 48 moves upwards relative to the telescopic inner rod 56, meanwhile, the second elastic arc plate 29 continues to move downwards, the triggering rack 48 moves upwards to enable the limiting block 55 to move towards one side of the clamping groove 57 formed in the telescopic outer sleeve 47, and after the middle point of the inner arc surface of the second elastic arc plate 29 is connected with the PE pipe, the limiting block 55 also moves into the clamping groove 57 in the telescopic outer sleeve 47 completely; meanwhile, the pressure sensor arranged on the second elastic arc plate 29 is extruded by the PE pipe, the pressure sensor can transmit an electronic signal to the first driving motor 16, and when the signal receiver on the first driving motor 16 receives the electronic signal which is transmitted to the pressure sensor 41 and can start to work, the signal receiver can transmit the signal to the control switch, so that the control switch controls the first driving motor 16 to start to work; the first driving motor 16 starts to work to drive the first driving gear 8 to rotate; in this state, the first driving gear 8 and the second driving gear 27 rotate simultaneously, and the first driving gear 8 and the second driving gear 27 enable the two ends of the first elastic arc plate 7 and the second elastic arc plate 29 to wrap the outer circular surface of the PE pipe in the same direction to clamp the PE pipe; the pressure on the upper side surface and the lower side surface of the PE pipe is basically zero; cutting after clamping; in the cutting process, the first driving rack 10 and the second driving rack 26 are always driven by the first driving motor 16 and the second driving motor 37, so that the first driving rack 10 and the second driving rack 26 are kept in a static state in the process, and the clamping of the first elastic arc plate 7 and the second elastic arc plate 29 on the PE pipe cannot be influenced by reverse movement; after the cutting is finished, the first driving motor 16 and the second driving motor 37 are controlled to work reversely, so that the first elastic arc plate 7 and the second elastic arc plate 29 are separated from the PE pipe, after the pressure sensor is separated from the PE pipe, the first driving motor 16 stops working, and the second driving motor 37 continues working, so that the second elastic arc plate 29 returns to the initial position.

Claims

1. A fixing device of plastic tubing characterized in that: the clamping device comprises clamping units and a fixing frame, wherein the fixing frame consists of a supporting bottom plate and two supporting vertical plates which are symmetrically distributed and fixed on the supporting bottom plate, and the two clamping units are symmetrically arranged on the fixing frame;

the clamping unit comprises an upper clamping mechanism and a lower supporting mechanism, wherein the lower supporting mechanism is arranged on the supporting base plate, and the upper clamping mechanism is arranged on one of the two supporting vertical plates; the upper clamping mechanism is matched with the lower supporting mechanism;

the lower supporting mechanism comprises a first elastic arc plate, a first driving gear, a first mounting shell, a first speed reducer, a first driving motor, a first supporting plate and a first driving gear, wherein the first mounting shell is fixedly mounted on the upper side of the supporting bottom plate; the outer arc surface of the first elastic arc plate is provided with a bulge, and the first elastic arc plate is arranged on the upper side of the first mounting shell through the bulge; the first driving motor is arranged on the upper side surface in the first mounting shell, a signal receiver and a control switch are arranged on the first driving motor, the first speed reducer is arranged on the inner side of the first mounting shell through a first supporting plate, and an input shaft of the first speed reducer is connected with an output shaft of the first driving motor; the first driving gear is arranged on an output shaft of the first speed reducer, and the first driving gear controls two sides of the first elastic arc plate to swing upwards through transmission under the driving of the first driving motor so as to clamp the PE pipe;

the upper clamping mechanism comprises a second driving gear, a second mounting shell, a second elastic arc plate, a second support plate, a third support plate, a second speed reducer, a second driving motor, a pressure sensor and a limiting mechanism, wherein a guide square opening is formed in the lower side surface of the second mounting shell, and the second mounting shell is fixedly mounted on one of two supporting vertical plates; the limiting mechanism is arranged in the second mounting shell; the outer arc surface of the second elastic arc plate is provided with a bulge, the second elastic arc plate is connected with the limiting mechanism through the bulge, and the bulge is matched with a guide square opening formed in the second mounting shell; the second driving motor is installed in the second installation shell through a second support plate, the second speed reducer is installed on the inner side of the second installation shell through a third support plate, and an input shaft of the second speed reducer is connected with an output shaft of the second driving motor; the second driving gear is arranged on an output shaft of the second speed reducer and is driven by a second driving motor to control two sides of the second elastic arc plate to swing downwards through transmission so as to clamp the PE pipe; a pressure sensor is arranged on the lower side of the second elastic arc plate; the pressure sensor transmits the signal to a signal receiver on the first driving motor in an electronic induction mode after receiving the signal;

the limiting mechanism comprises a telescopic rod, a trigger rack, a return spring, a fixed support, a rod sleeve, an extrusion spring, a driving plate, a trigger gear, a limiting block, a clamping groove, a telescopic rod support, a square opening, a gear fixing shaft and an avoiding inclined plane, wherein the telescopic rod consists of a telescopic outer sleeve and a telescopic inner rod; a plurality of clamping grooves are uniformly formed in the upper part and the lower part of one side surface in the telescopic outer sleeve, and the upper end of the telescopic outer sleeve is fixedly arranged on the inner side of the second mounting shell through a telescopic rod support; the telescopic inner rod is hollow, the lower end of the telescopic inner rod is an open end, the upper end of the telescopic inner rod is nested and installed in the telescopic outer sleeve, and the lower end of the telescopic inner rod is connected with the bulge on the second elastic arc plate; a driving plate is arranged on the trigger rack, the trigger rack is arranged on the telescopic inner rod through the sliding fit of the driving plate and the inner side surface of the telescopic inner rod, and a return spring is arranged between the lower side surface of the driving plate and the upper side surface of the bulge on the second elastic arc plate; two ends of the gear fixing shaft are fixedly arranged on the inner side surface of the telescopic inner rod, and the trigger gear is arranged on the gear fixing shaft; the trigger gear is meshed with the trigger rack; the upper side of one end of the limiting block is provided with an avoiding inclined plane, the lower side surface of the limiting block is provided with teeth, the limiting block is arranged on the telescopic inner rod through a fixed support, and the limiting block is in sliding fit with the fixed support; the limiting block penetrates through a square opening formed in the telescopic inner rod and is matched with a clamping groove in the telescopic outer sleeve; the limiting block is meshed with the trigger gear through teeth on the limiting block; a rod sleeve is arranged at the lower end of the trigger rack through the matching of the guide block and the guide groove, and an extrusion spring is arranged between the bottom surface of the inner side of the rod sleeve and the lower side surface of the trigger rack; the rod sleeve cannot be separated from the trigger rack; the lower end of the rod sleeve penetrates through the avoidance guide groove formed in the second elastic arc plate, and the rod sleeve is in sliding fit with the avoidance guide groove formed in the second elastic arc plate.

2. A fixing device of a plastic pipe according to claim 1, wherein: the upper side of the first mounting shell is provided with two symmetrical first sliding chutes; two symmetrical T-shaped sliding grooves are formed in the outer arc surface of the first elastic arc plate; the first driving rack is supported and installed in the first installation shell through the first rack, and the first driving rack is meshed with the first driving gear; the first push plate is arranged on the upper side of the first driving rack; the upper side surface of each first pushing block is provided with a driving inclined plane groove, and the two first pushing blocks are symmetrically arranged at two ends of the upper side of each first pushing plate;

the two first push blocks are connected with the first elastic arc plate in the same structure, and for any one of the first push blocks, the triangular slide block is arranged on the first push block in a sliding fit manner and cannot be separated from the first push block; the inclined plane on the triangular sliding block is matched with the inclined plane in the groove of the driving inclined plane on the first pushing block; a buffer spring which cannot be bent is arranged between the triangular sliding block and the driving inclined plane groove; the lower end of the driving rod is arranged on the upper side of the triangular sliding block, and the upper end of the driving rod is fixedly provided with a rolling shaft; the rolling shaft is in sliding fit with the T-shaped arc groove formed in the first elastic arc plate.

3. A fixing device of a plastic pipe according to claim 2, wherein: two guide grooves are symmetrically formed in two sides of the driving inclined plane groove formed in the first pushing block, two guide blocks are symmetrically arranged on two sides of the triangular sliding block, the triangular sliding block is arranged on the first pushing block through the matching of the two guide blocks and the two guide grooves, and the inclination angle between the two guide grooves and the lower side surface of the first pushing block is the same as the inclination angle between the inclined plane of the driving inclined plane groove and the lower side surface of the first pushing block.

4. A fixing device of a plastic pipe according to claim 2, wherein: the alternative scheme that the roller is fixedly arranged on the driving rod is that the roller is arranged on the driving rod through a shaft sleeve, the shaft sleeve and the driving rod are fixedly arranged, and the roller is arranged on the shaft sleeve through a bearing; the rolling shaft is matched with the T-shaped arc groove formed on the first elastic arc plate in a rolling way.

5. A fixing device of a plastic pipe according to claim 2, wherein: four isolation plates for preventing the buffer spring from being bent are installed on the outer side of the buffer spring, one ends of the four isolation plates are fixedly installed on the triangular sliding block, and the other ends of the four isolation plates penetrate through the first push block and are located on the outer side of the first push block.

6. A fixing device of a plastic pipe according to claim 1 or 2, characterized in that: the lower side of the second mounting shell is provided with two symmetrical second sliding chutes; two symmetrical T-shaped sliding grooves are formed in the outer arc surface of the second elastic arc plate; the second driving rack is supported and installed in the second installation shell through the second rack, and the second driving rack is meshed with the second driving gear; one end of the U-shaped connecting plate, which is back to the U-shaped opening, is arranged on the lower side of the second driving rack; the second push plate is arranged on the lower side of the U-shaped connecting plate; a return spring is arranged between the second push plate and the second elastic arc plate and nested outside the telescopic rod; the upper side surfaces of the second push blocks are provided with driving inclined plane grooves, and the two second push blocks are symmetrically arranged at two ends of the lower side of the second push plate; the connection mode between the two second push blocks and the second elastic arc plate is the same as the connection mode between the two first push blocks and the first elastic arc plate.

7. A fixing device of plastic tubes according to claim 6, characterized in that: the second push plate is provided with a square guide opening avoiding the telescopic outer sleeve.

8. A fixing device of a plastic pipe according to claim 1, wherein: the inner side of the telescopic outer sleeve is provided with two symmetrical square guide grooves, two sides of the upper end of the telescopic inner rod are symmetrically provided with two square guide blocks, and the upper end of the telescopic inner rod is arranged in the telescopic outer sleeve through the matching of the two square guide blocks and the square guide grooves.

9. A fixing device of a plastic pipe according to claim 2, wherein: the buffer spring is always in a compressed state.

10. A fixing device of plastic tubes according to claim 6, characterized in that: the return spring is a compression spring; the return spring is an extension spring; the compression spring is a compression spring.