CN209933758U - Tube drawing device - Google Patents

Abstract

The utility model provides a tube drawing device for the sheath pipe after the separation shaping reaches quilt the plug of sheath pipe parcel, expose outside the rear end of plug the sheath pipe, tube drawing device including bearing the base station, set up in be used for compressing tightly on bearing the base station the sheath pipe compress tightly the piece, set up in be used for locking on bearing the base station the retaining member of plug rear end and set up in bear on the base station and connect the driving piece of retaining member, the driving piece is automatic to be driven the retaining member with the plug is together followed the axial of sheath pipe and towards keeping away from the direction of sheath pipe is removed, so that the plug is followed the sheath intraductal is extracted. This tube drawing device, not only tube drawing is efficient, easily tube drawing just can avoid the sheath pipe to appear bending deformation at tube drawing in-process, guarantees the straightness accuracy of sheath pipe.

Description

Tube drawing device

Technical Field

The utility model relates to the technical field of medical instrument preparation, especially, relate to a tube drawing device.

Background

Medical catheters or sheaths are widely used in interventional procedures.

At present, in the manufacturing process of the sheath tube, a core rod is wrapped by a plurality of layers of different tube body materials, and is subjected to hot melting composite molding at a high temperature, and then the sheath tube and the core rod are separated manually, which is called tube drawing by a person skilled in the art. As shown in fig. 1, the manual tube drawing method specifically includes: one end of the core rod 2000 is clamped by the fixing clamp 1000, the front side and the rear side of the sheath tube 3000 are tightly held by two hands, and the sheath tube 3000 is drawn in the direction away from the core rod 2000, so that the sheath tube 3000 is separated from the core rod 2000, and the purpose of drawing the core rod 2000 away is achieved.

The manual tube drawing efficiency is low, and because the position of the sheath tube held by the hand is only two points, the holding force, the pulling force and the pulling force direction exerted by the hand are not easy to be accurately controlled, so that the relative movement direction of the sheath tube and the core rod cannot be consistent with the axial direction of the core rod and the sheath tube all the time, and the problem that the sheath tube is difficult to be drawn out or the sheath tube is bent and deformed after being drawn out is easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an efficient, easily tube drawing and can avoid the sheath pipe to appear bending deformation's tube drawing device at the tube drawing in-process.

The utility model provides a tube drawing device for the sheath pipe after the separation shaping reaches quilt the plug of sheath pipe parcel, the rear end of plug is exposed the sheath pipe, tube drawing device including bearing the base station, set up in be used for compressing tightly on bearing the base station the sheath pipe compress tightly the piece, set up in be used for locking on bearing the base station the retaining member of plug rear end and set up in bear on the base station and connect the driving piece of retaining member, the driving piece is automatic to be driven the retaining member with the plug is together followed the axial of sheath pipe and towards keeping away from the direction of sheath pipe is removed, so that the plug is followed the sheath intraductal is extracted.

The tube drawing device is automatically driven based on the driving piece, the locking piece and the core rod are together followed the axial direction of the sheath tube is moved towards the direction of the sheath tube so as to separate the sheath tube from the core rod, the efficiency is high, the tube drawing is easy, the bending deformation of the sheath tube in the tube drawing process can be avoided, and the straightness of the sheath tube is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic view of a conventional manual tube drawing method.

Fig. 2 is a schematic view of a combined structure of a core rod and a sheath according to an embodiment of the present invention.

Fig. 3 is an assembly schematic diagram of a tube drawing device according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a first embodiment of the hold down of the tube drawing device of fig. 3.

Fig. 5 is an exploded view of the compression member of the tube drawing device of fig. 4.

Fig. 6 is a schematic view of another angle of the hold-down block of the hold-down member of fig. 5.

Fig. 7 is a cross-sectional view of the compact of fig. 6.

Fig. 8 is an exploded view of the retaining member of the tube drawing device of fig. 3.

Fig. 9 is a cross-sectional view of the retaining member of the tube drawing device of fig. 3.

Fig. 10 is a schematic view of the driving member of the pipe drawing device of fig. 3.

Fig. 11 is an exploded view of a portion of the structure of the driver of fig. 10.

FIG. 12 is an assembly schematic view of a portion of the structure of the retaining member and the driving member of the tube drawing device of FIG. 3.

FIG. 13 is a cross-sectional view of a portion of the structure of the retaining member and the driving member of the tube drawing device of FIG. 12.

Fig. 14 is a first operating condition diagram of the pipe drawing device of fig. 3.

Fig. 15 is an enlarged view at I in fig. 14.

Fig. 16 is a second operating condition diagram of the tube drawing device of fig. 3.

Fig. 17 is a schematic structural view of a second embodiment of the hold down of the tube drawing device of fig. 3.

Fig. 18 is an exploded view of the crimping element of the tube drawing device of fig. 17.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is understood that the terminology used in the description and claims of the present invention and the accompanying drawings are for the purpose of describing particular embodiments only and are not intended to be limiting of the invention. The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprises" and any variations thereof is intended to cover non-exclusive inclusions. Furthermore, the invention may be embodied in many different forms and is not limited to the embodiments described. The following detailed description is provided for the purpose of providing a more thorough understanding of the present disclosure, and the terms upper, lower, left, right, etc. used to indicate orientation are merely used to indicate the position of the illustrated structure in the corresponding drawings.

While the following description is directed to the preferred embodiment of the present invention, the foregoing description is provided as illustrative of the general principles of the invention and is not intended to limit the scope of the invention. The protection scope of the present invention is subject to the limitations defined by the appended claims.

Referring to fig. 2 and fig. 3, fig. 2 is a schematic view showing a combined structure of a mandrel 200 and a sheath 201, and fig. 3 is a schematic view showing a structure of a tube drawing device 100 according to an embodiment of the present invention. The tube drawing device 100 is used for separating the formed sheath tube 201 and the core rod 200 wrapped by the sheath tube 201, and the rear end of the core rod 200 is exposed out of the sheath tube 201. Tube drawing device 100 including bear base station 1, set up in bear and be used for compressing tightly on the base station 1 sheath 201 compress tightly 2, set up in bear and be used for locking on the base station 1 retaining member 3 of plug 200 rear end and set up in bear on the base station 1 and connect retaining member 3's driving piece 4, driving piece 4 automatic drive plug 200 with retaining member 3 is together followed sheath 201's axial and towards keeping away from the direction of sheath 201 removes, so that plug 200 follows extract in the sheath 201. The embodiment of the utility model provides a tube drawing device 100 is based on driving piece 4 is automatic to be driven retaining member 3 with plug 200 is together followed the axial of sheath pipe 201 just is towards keeping away from the direction of sheath pipe 201 is removed, has not only improved the separation efficiency of plug 200 with sheath pipe 201, and can avoid sheath pipe 201 in the problem that the bending deformation appears of tube drawing in-process, improves the straightness accuracy of tube drawing back sheath pipe.

As shown in fig. 2, the central axis of the core rod 200 is collinear with the central axis of the sheath 201. Before the tube drawing is performed, both the mandrel 200 and the sheath 201 are linear. Specifically, the sheath 201 includes an inner layer 202, an intermediate layer 203, and an outer layer 204. The inner layer 202, the intermediate layer 203, and the outer layer 204 are coaxially disposed. Mandrel 200 is used to support inner layer 202, and inner layer 202 is preferably a Polytetrafluoroethylene (PTFE) tube. The middle layer 203 is preferably a woven mesh/spring and is placed over the inner layer 202. The outer layer 204 is preferably a nylon tube and is sleeved over the mandrel 200. In the process of manufacturing the sheath 201, the heat shrinkable tube 205 is sleeved outside the outer layer 204, the core rod 200 and each layer of tube body are placed in an oven to be heated, so that the nylon tube is melted and fully welded with the woven mesh/spring and the PTFE tube and is wrapped on the core rod 200, then the nylon tube is taken out integrally and cooled and solidified, and the heat shrinkable tube 205 is peeled off, so that the sheath 201 to be drawn is manufactured. Finally, the mandrel 200 is pulled away by using the tube drawing device 100 to produce the sheath 201.

With reference to fig. 3 to 7 and 14 to 16, the compressing member 2 is used for loading and compressing the sheath 201 to be extracted. In an embodiment, the number of the pressing pieces 2 is 2, and the two pressing pieces 2 are arranged along the axial direction of the sheath 201 at intervals and are respectively used for pressing the front end and the rear end of the sheath 201, i.e. the central axes of the two pressing pieces 2 are located on the same straight line, so as to ensure that the front end and the rear end of the sheath 201 keep straight lines and are not easy to tilt in the tube drawing process, thereby avoiding the problem of bending deformation of the sheath 201 in the tube drawing process. In another embodiment, when the length of the sheath 201 is short, the number of the pressing pieces 2 may be only 1, and the pressing pieces 2 are used to clamp the middle portion of the sheath 201. It can be understood that, in other embodiments, the number of the pressing pieces 2 may also be more than 2, and those skilled in the art can design the number of the pressing pieces 2 according to the length of the sheath 201 to firmly clamp the sheath 201, so as to ensure that the sheath 201 is still linear after being separated from the mandrel 200.

As shown in fig. 4 and 5, the pressing member 2 has a substantially axisymmetric structure. The pressing member 2 includes a positioning block 21 and a pressing block 22 which are matched with each other, and the sheath 201 is clamped between the positioning block 21 and the pressing block 22. A channel 23 for clamping the sheath 201 is enclosed between the positioning block 21 and the pressing block 22. Optionally, the distance between the positioning block 21 and the pressing block 22 is adjustable to clamp sheath tubes 201 with different outer diameters. The pressing block 22 is movable relative to the positioning block 21 in a direction perpendicular to the central axis of the sheath 201. Specifically, in the present embodiment, the positioning block 21 is detachably fixed on the carrying base 1. The pressing block 22 is movably disposed on the bearing base 1, and the positioning block 21 is disposed opposite to the pressing block 22. The pressing block 22 can move relative to the positioning block 21 along a direction perpendicular to the central axis of the sheath 201 to press or release the sheath 201 between the positioning block 21 and the pressing block 22. In other embodiments, the pressing block 22 may also be fixedly disposed on the bearing base 1, and the positioning block 21 may be movably connected to the pressing block 22 or the bearing base 1, so that the distance between the positioning block 21 and the pressing block 22 may also be adjusted by adjusting the height of the positioning block 21 relative to the pressing block 22 or the bearing base 1; specifically, the positioning block 21 may be detachably connected to the pressing block 22 or the bearing base 1 by a screw, so that the sheath 201 to be pulled in different diameters may be clamped between the positioning block 21 and the pressing block 22 by adjusting the depth of the screw inserted into the pressing block 22 or the bearing base 1. It is understood that in other embodiments, the positions of the positioning block 21 and the pressing block 22 relative to the supporting base 1 can be adjusted at the same time to adjust the distance between the positioning block 21 and the pressing block 22.

In some embodiments, the positioning block 21 may be detachably fixed on the carrying base 1 by a mounting structure. The mounting structure may be, but is not limited to, a screw, a magnetic attachment structure, or a snap. In some embodiments, the positioning block 21 may be fixed on the bearing base 1 by welding. In this embodiment, the mounting structure is a screw, the four corners of the positioning block 21 are provided with a plurality of through holes 211 through which the screw passes, the position of the bearing base platform 1 corresponding to the through holes 211 is provided with a plurality of screw holes, and the screw passes through the through hole 211 of the positioning block 21 and is locked in the screw hole of the bearing base platform 1, so that the positioning block 21 is fixed on the bearing base platform 1.

The positioning block 21 is provided with a receiving groove 212 on one side close to the pressing block 22. The pressing block 22 includes a pressing portion 221 received in the receiving groove 212. The receiving groove 212 is a through groove. The receiving groove 212 includes a groove bottom 213 and two opposite groove walls 214. The groove bottom 213 and the two groove walls 214 together define a substantially M-shaped receiving groove 212. The groove bottom 213 is substantially V-shaped. An arc-shaped first recess 2131 is formed in the center of the groove bottom 213. The extending direction of the first recess 2131 coincides with the extending direction of the receiving groove 212. The pressing portion 221 is provided with a second groove 2211 directly opposite to the first groove 2131. The longitudinal direction of the first groove 2131 is parallel to the longitudinal direction of the second groove 2211. Optionally, the radial cross-sections of the first recess 2131 and the second recess 2211 are each substantially semicircular. The first recess 2131 and the second recess 2211 cooperate to form a passage 23 that holds the sheath 201. The shapes of the first recess 2131 and the second recess 2211 can be designed according to the shape of the sheath 201, so that the shape of the sheath 201 is matched with the shape of the channel 23, thereby increasing the contact area between the sheath 201 and the pressing piece 2, and further enhancing the fixed connection between the sheath 201 and the pressing piece 2.

Optionally, at least one groove wall 214 of the accommodating groove 212 is provided with a limiting opening 215 penetrating through the groove wall 214, and the pressing portion 221 is provided with a limiting portion 222 adapted to the limiting opening 215. In the present embodiment, the positioning block 21 has two stopper holes 215 penetrating the accommodating groove 212 on the side of the groove walls 214 away from the groove bottom 213. The position-limiting portion 222 is adapted to the position-limiting opening 215. The two position-limiting portions 222 are located on two opposite sides of the length direction of the second groove 2211 parallel to the pressing portion 221. So, at the tube drawing in-process, sheath 201 is by the centre gripping between locating piece 21 and compact heap 22, because spacing portion 222 block in spacing mouth 215, can avoid compact heap 22 to follow the axial displacement of plug 200 to compact heap 2 can compress tightly the sheath 201 of treating the tube drawing firmly.

Specifically, when the pressing block 22 is tightly attached to the positioning block 21, the first recess 2131 and the second recess 2211 together enclose the passage 23 forming the hole pattern. The outer diameter of the sheath 201 is greater than or equal to the diameter of the first recess 2131 and/or the diameter of the second recess 2211, so that the sheath 201 is held in the channel 23. In the present embodiment, the pressing portion 221 has a pressing surface 2212 that fits in the groove bottom 213 of the positioning block 21. When the outer diameter of the sheath 201 is equal to the diameter of the first groove 2131 and/or the diameter of the second groove 2211, the pressing surface 2212 abuts against the groove bottom 213. When the outer diameter of the sheath 201 is larger than the diameter of the first groove 2131 and/or the diameter of the second groove 2211, a gap is formed between the pressing surface 2212 and the groove bottom 213.

Further, as shown in fig. 6 and 7, in the present embodiment, the pressing member 2 further includes a first driving cylinder 24. The first driving cylinder 24 is disposed on a side of the pressing block 22 away from the positioning block 21. Specifically, the first drive cylinder 24 includes a cylinder tube 241 and a piston rod 242 connected to the cylinder tube 241. One side of the pressing block 22, which is away from the positioning block 21, is provided with a locking hole 223 which is engaged with the piston rod 242. The first driving cylinder 24 is used for driving the pressing block 22 to move in the up-and-down direction relative to the positioning block 21, so that the pressing block 22 is attached to or away from the positioning block 21. It will be appreciated that in some embodiments, the first drive cylinder 24 may be omitted, i.e., the distance between the positioning block 21 and the pressing block 22 may be adjusted by manual adjustment.

Optionally, in order to prevent the pressing piece 2 from clamping the sheath 201, flexible gaskets are disposed in the first recess 2131 of the positioning block 21 and the second recess 2211 of the pressing block 22. The flexible gasket may be adhered to part or all of the surfaces of the first recess 2131 and the second recess 2211 by gluing. The flexible gasket may be, but is not limited to, a silicone gasket, an asbestos gasket, a rubber gasket, a flexible graphene gasket, or a polytetrafluoroethylene gasket. It will be appreciated that other gaskets made of flexible material are also suitable for use with the present invention. Further, in some embodiments, a pressure sensor may be disposed in the first recess 2131 and/or the second recess 2211, and when a pressure value sensed by the pressure sensor is within a preset range, the first driving cylinder 24 stops driving the piston rod 242 to move, so that the sheath 201 may be prevented from being pinched by the pinching block 22 due to excessive pinching of the positioning block 21.

Referring to fig. 3, 8 and 9, the locking member 3 is disposed between the pressing member 2 and the driving member 4. The locking member 3 comprises a locking nozzle 31 for clamping one end of the core rod 200 exposed out of the sheath 201, a locking sleeve 32 sleeved on the locking nozzle 31, a mounting block 33 for mounting the locking sleeve 32, and a connecting member 34 for connecting the locking nozzle 31 and the driving member 4, wherein the locking sleeve 32 can move axially relative to the locking nozzle 31 to adjust the locking force of the locking nozzle 31 on the core rod 200.

The lock nib 31 has a hollow structure. The inside diameter of the lock nib 31 is greater than or equal to the outside diameter of the plug 200 so that the plug 200 can be inserted into the lock nib 31. The front end of the lock nib 31 is provided with an elastic collet 311 that receives and fastens the plug 200. The collet 311 has a generally conical outer peripheral surface 3110, and the collet 311 includes at least two-piece conical collet blocks 3111. A gap 3112 is provided between two adjacent tapered chuck blocks 3111 to provide elasticity. The outer diameter of the collet 311 formed by the at least two tapered collet blocks 3111 gradually increases from the end away from the mandrel 200 to the end near the mandrel 200 to lock mandrels 200 of different outer diameters. In the present embodiment, the collet 311 has a three-lobed tapered collet block 3111. In other embodiments, collet 311 may also have more than three tapered collet blocks 3111. It is understood that in the present embodiment, the front end of the collet 311 refers to the free end of the collet 311 near the mandrel 200, and the rear end of the collet 311 refers to the connecting end of the collet 311 away from the mandrel 200, i.e., the end opposite to the free end of the collet 311. The locking sleeve 32 is movably disposed on the collet 311 such that the locking sleeve 32 controls the collet 311 to lock or unlock the mandrel 200. Specifically, as the locking sleeve 32 moves continuously toward the front end of the collet 311, the collet 311 gradually tightens to lock the mandrel 200 within the collet 311; as the locking sleeve 32 continues to move toward the rear end of the collet 311, the collet 311 gradually expands to unlock the mandrel 200 from the collet 311 for removal of the mandrel 200.

The end of the locking nib 31 facing away from the collet 311 is provided with a coupling head 312. The connecting head 312 is fixedly connected to the connecting member 34. Specifically, the connection head 312 is axially opened with a connection hole 313. The connecting piece 34 is provided with a connecting rod 341 which is matched with the connecting hole 313 along the axial direction at one side close to the lock mouth 31. In this embodiment, the connection head 312 of the lock nib 31 and the connection rod 341 of the connection member 34 are fixedly connected together by a screw fastening method, that is, the connection hole 313 is a screw hole, and the connection rod 341 is a screw rod. One end of the connecting piece 34, which is far away from the connecting rod 341, is fixedly connected with the driving piece 4, so that the connection between the locking piece 3 and the driving piece 4 is realized. Alternatively, the locking nib 31 may be connected to the locking sleeve 32 by a connector 312.

The locking sleeve 32 is of hollow construction. The locking sleeve 32 comprises a connecting sleeve 322 and a locking sleeve 321 which is movably connected to the connecting sleeve 322. The locking sleeve 321 is rotatable and axially movable relative to the connecting sleeve 322. Specifically, in the present embodiment, the locking sleeve 321 and the connecting sleeve 322 are connected together by a screw-coupling manner. The locking sleeve 321 has a generally tapered inner circumferential surface 3211, and the inner circumferential surface 3211 engages with the outer circumferential surface 3110 of the collet 311, so that the locking sleeve 321 moves back and forth in the axial direction relative to the collet 311, thereby controlling the collet 311 to lock or unlock the mandrel 200. Specifically, as the locking sleeve 321 is continuously moved forward (i.e., toward the end adjacent the mandrel 200) relative to the collet 311, the collet 311 gradually tightens together to lock the mandrel 200 within the collet 311; as the locking sleeve 321 is increasingly moved rearward (i.e., toward the end away from the mandrel 200) relative to the collet 311, the collet 311 gradually expands to release the mandrel 200 from the collet 311 for removal of the mandrel 200. In this way, during the tube drawing process, the locking sleeve 321 of the locking sleeve 32 is rotated to enable the collet 311 of the locking nib 31 to have enough holding force to lock the mandrel 200, thereby ensuring that the mandrel 200 does not fall off the locking nib 31 during the tube drawing process. The connecting sleeve 322 is fixedly mounted on the mounting block 33 and fixedly connected to the connecting head 312 of the lock nib 31. Specifically, an outer thread is provided on an outer circumferential surface of an end of the connecting sleeve 322 facing away from the locking sleeve 321. The mounting block 33 is opened with a mounting hole 331 through which the connection sleeve 322 passes. The surface of the mounting hole 331 is provided with an internal thread to be screwed with the external thread of the coupling sleeve 322. An internal thread is provided on the inner peripheral surface of the coupling sleeve 322, and an external thread screwed with the internal thread of the coupling sleeve 322 is provided on the outer peripheral surface of the coupling head 312.

Optionally, to enhance the secure attachment of the attachment sleeve 322 to the mounting block 33, the retaining member 3 further comprises a locking ring 35. The locking ring 35 is sleeved on a portion of the rear end of the connecting sleeve 322 extending out of the mounting block 33, and is detachably fixed to the connecting sleeve 322 to prevent the connecting sleeve 322 from moving forward (i.e. toward a direction close to the collet 311) relative to the mounting block 33 during a tube drawing process. In the present embodiment, the locking ring 35 is a nut.

The driving member 4 includes a guide post 42, the mounting block 33 is slidably sleeved on the guide post 42, and a central axis of the guide post 42 is parallel to central axes of the sheath 201 and the locking nib 31, so as to guide the locking member 3 and the core rod 200 to move together along the sheath 201. Specifically, the mounting block 33 further defines a guide hole 332 for receiving the guide post 42. Optionally, a guide sleeve 36 adapted to the guide post 42 is disposed in the mounting block 33, and the guide sleeve 36 is slidably sleeved on the guide post 42. Specifically, the guide bush 36 is fixed in the guide hole 332 of the mounting block 33. The top of the mounting block 33 is formed with a locking hole 333 penetrating the guide hole 332. The guide sleeve 36 is a hollow tubular structure. The guide sleeve 36 is provided with a screw hole 361 extending in the radial direction. In this embodiment, the screw bolt is locked in the screw hole 361 through the locking hole 333, thereby fixedly connecting the guide sleeve 36 to the mounting block 33. The extending direction of the guide hole 332 is parallel to the axial direction of the mandrel 200 to ensure that the mandrel 200 moves along the axial direction of the sheath 201 during the tube drawing process without generating directional deviation. In other embodiments, the guide sleeve 36 may be fixed in the guide hole 332 by a screw-fastening method, i.e. the outer circumference of the guide sleeve 36 is provided with an external thread, and the guide hole 332 is provided with an internal thread screwed with the thread of the guide sleeve 36.

In the present embodiment, the number of the guide sleeves 36 is two. The two guide sleeves 36 are disposed on two sides of the mounting block 33, that is, the locking member 3 has an axisymmetric structure, so as to improve the stability of the axial movement of the mandrel 200 along the sheath 201. In other embodiments, the number of the guide sleeves 36 may also be 1 or more, and is not limited herein. Optionally, the inner wall of the guide sleeve 36 is provided with a plurality of rows of balls to reduce friction between the guide sleeve 36 and the guide post 42, so as to improve the smoothness of the guide sleeve 36 and the mounting block 33 moving back and forth on the guide post 42 along the axial direction of the core rod 200 and the sheath 201.

With reference to fig. 3, 10 and 11, in the present embodiment, the driving member 4 has an axisymmetric structure. The driving member 4 further includes a mounting plate 41, a positioning plate 44, a second driving cylinder 40, a cylinder pressing block 47, and a supporting plate 48. The second driving cylinder 40 includes a cylinder tube 45 and a piston rod 49 connected to the cylinder tube 45. The mounting plate 41, the positioning plate 44 and the support plate 48 are all fixed on the bearing base 1. The mounting block 33 is located between the mounting plate 41 and the positioning plate 44, and the two ends of the guide post 42 are fixed to the mounting plate 41 and the positioning plate 44, respectively. In the present embodiment, the mounting plate 41, the positioning plate 44 and the support plate 48 are detachably fixed to the supporting base 1. Specifically, the mounting plate 41, the positioning plate 44 and the supporting plate 48 are fixed to the supporting base 1 by a plurality of screws. In other embodiments, the mounting plate 41, the positioning plate 44 and the supporting plate 48 can also be fixed on the supporting base 1 by welding. The positioning plate 44 is disposed between the mounting plate 41 and the supporting plate 48. The second driving cylinder 40 is fixed between the positioning plate 44 and the cylinder block 47. The support plate 48 is provided between the cylinder block 47 and the bearing base 1, and serves to support the cylinder block 47.

The mounting plate 41 and the positioning plate 44 are respectively provided with two through holes 411 (see fig. 13) and 441 for the two guide posts 42 to correspondingly pass through. The center axes of the guide hole 332 of the mounting block 33, the through hole 411 of the mounting plate 41, and the through hole 441 of the positioning plate 44 are positioned on the same straight line. The mounting plate 41 and the positioning plate 44 are respectively provided with two clamping holes 412 and 442 penetrating through the two through holes 411 and 441. The two fastening holes 412, 442 extend along the radial direction of the through holes 411, 441. The two ends of each guide post 42 are fixed to the mounting plate 41 and the positioning plate 44 by bolts and bolts respectively. Specifically, the screw pins sequentially pass through the locking holes 412 and 442 and the through holes 411 and 441, so as to fixedly connect the guide post 42 with the mounting plate 41 and the positioning plate 44. The bottom of the mounting plate 41 is opened with a notch 414 for passing the lock mouth 31 and the lock sleeve 32 of the lock member 3. The gap 414 is located at the middle position of the two through holes 411. The positioning plate 44 is provided with a positioning hole 444 corresponding to the notch 414 and used for mounting the front end of the cylinder tube 45. The rear end of the cylinder tube 45 is fixed by a cylinder press block 47. The positioning hole 444 is located at the middle of the two through holes 441.

The piston rod 49 of the actuating member 4 is fixedly connected to the connecting member 34 of the locking member 3. Specifically, a screw hole 342 is formed on one side of the connecting member 34 away from the connecting rod 341. The end of the piston rod 49 near the locking member 3 is provided with a screw 491 which is matched with the screw hole 342. The central axis of the cylinder 45 of the second driving cylinder 40, the central axis of the piston rod 49, the central axis of the lock nozzle 31, the sheath 201 compressed by the compressing element 2 and the central axis of the core rod 200 are located on the same straight line, so that the second driving cylinder 40 can provide the pulling force which is axially consistent with the core rod 200, the pulling force is uniform in force, the core rod 200 moves axially all the time in the tube drawing process, the sheath 201 is clamped axially all the time, and after the tube is drawn, the straightness of the sheath is maintained, and the bending deformation is avoided.

The second driving cylinder 40 drives the piston rod 49 to drive the locking member 3 and the mandrel 200 to move along the axial direction of the sheath 201. A positioning ring 492 is further provided on the piston rod 49 near the screw 491. The positioning ring 492 is sleeved on the screw 491. The positioning ring 492 is used for limiting the depth of the screw 491 inserted into the connecting hole 342 of the connecting member 34, so that the problem that the locking member 3 is loosened from the driving member 4 due to the fact that the screw 491 is inserted into the connecting hole 342 too shallowly can be avoided. In this embodiment, the cage 492 is a cage nut. In some embodiments, the positioning ring 492 may be fixed to the connecting member 34, so that the screw 491 can be screwed with the connecting member 34 and the positioning ring 492 simultaneously, which is equivalent to extending the screwing length, thereby further reinforcing the fixed connection between the connecting member 34 and the piston rod 49.

The central axis of the core rod 200, the central axis of the sheath 201, the central axis of the locking member 3, the central axis of the guide post 42, the central axis of the cylinder 45 and the central axis of the piston rod 49 are coplanar, so that the tube drawing device 100 can provide uniform force, the pulling force with the direction always consistent with the axial direction of the core rod 200 and the sheath 201 is used for drawing away the core rod 200, the relative movement direction of the core rod 200 and the sheath 201 is always consistent with the axial direction of the core rod 200 and the sheath 201 in the tube drawing process, the core rod 200 and the sheath 201 are easily separated, the sheath 201 can be prevented from bending deformation, and the straightness of the sheath 201 after the tube drawing is ensured; adopt the second to drive actuating cylinder 40 automatic drive and implement the tube drawing, compare in current manual tube drawing mode, improved tube drawing efficiency by a wide margin.

Further, in the present embodiment, two screw holes 421 for screwing the screw pins are correspondingly disposed at the front and rear ends of each guide post 42. A first buffer pad 461 is sleeved on one end of each guide post 42 close to the guide mounting plate 41. The first buffer pad 461 is disposed between the mounting block 33 and the mounting plate 41 for preventing collision between the mounting block 33 and the mounting plate 41. A second cushion 462 is sleeved on one end of the guide post 42 close to the positioning plate 44 to avoid collision between the mounting block 33 and the positioning plate 44 in the process of separating the core rod 200 and the sheath 201. Optionally, a crash sleeve 43 is further disposed on the end of the guide post 42 close to the positioning plate 44, and the crash sleeve 43 is located between the second cushion 462 and the positioning plate 44. The anti-collision sleeve 43 is slidably sleeved on the guide post 42, and further, one end of the anti-collision sleeve 43 close to the positioning plate 44 is connected to an elastic member 431, and the elastic member 431 is stopped by the through hole 441. In this way, when the second driving cylinder 40 drives the piston rod 49 to move the locking member 3 and the mandrel 200 toward the positioning plate 44 along the axial direction of the guide post 42, a buffering force can be provided for the mounting block 33, so that the mounting block 33 can be further prevented from colliding with the positioning plate 44. In the present embodiment, the elastic member 431 is a spring. It is understood that in other embodiments, the elastic member 431 may be a spring plate or other elastic member. It is understood that, in the present embodiment, the first and second buffer pads 461 and 462 can be, but are not limited to, a silicone pad, an asbestos pad, a rubber pad, a flexible graphene pad, or a teflon pad. It will be appreciated that other gaskets made of flexible material are also suitable for use with the present invention.

Referring to fig. 2 to 13, when the pressing member 2 is assembled, the positioning block 21 is fixed on the supporting base 1, and the positioning block 21 is opposite to the corresponding pressing block 22. When the locker 3 is assembled, the locking sleeve 32 is fitted into the fitting hole 331 of the fitting block 33. The locking nib 31 penetrates into the locking sleeve 32, and the connecting head 312 of the locking nib 31 is fixed in the connecting sleeve 322 of the locking sleeve 32, so that the locking sleeve 32 is sleeved on the locking nib 31, and two ends of the connecting sleeve 322 are exposed out of the mounting block 33. The locking ring 35 is sleeved on an end of the connecting sleeve 322 far away from the locking sleeve 321 to reinforce the connection between the connecting sleeve 322 and the mounting block 33. The guide sleeve 36 is pressed into the guide hole 332 and the screw pin is locked into the screw hole 361 of the guide sleeve 36 through the locking hole 333 of the mounting block 33 to fix the guide sleeve 36 to the mounting block 33. The connection rod 341 of the connection member 34 is locked in the connection hole 313 of the connection head 312. When the driving unit 4 is assembled, the mounting plate 41, the positioning plate 44, and the support plate 48 of the driving unit 4 are fixed to the supporting base 1. The guide post 42 is sequentially inserted through the through hole 411 of the mounting plate 41, the guide hole 332 of the mounting block 33 and the through hole 441 of the positioning plate 44, the through holes 411 and 441 are respectively aligned with the screw holes 421 of the guide post 42, and the screw pins are sequentially inserted into the corresponding fastening holes 412 and 442 and the screw holes 421, thereby fixing the guide post 42 between the mounting plate 41 and the positioning plate 44. The cylinder block 47 is mounted on the support plate 48, and the cylinder tube 45 is mounted on the cylinder block 47 and the positioning plate 44. The screw 491 of the piston rod 49 is locked in the screw hole 342 of the connecting piece 34, so that the connecting of the locking piece 3 and the driving piece 4 is realized. The above-mentioned assembling method of the components is only the preferred assembling method of the tube drawing device 100 of the present invention, and should not be construed as a limitation to the present invention.

Referring to fig. 14 to 16, the process of using the tube drawing device 100 includes: the first driving cylinder 24 is activated to control the holding-down block 22 to move in a direction away from the positioning block 21, i.e. the holding-down block 22 releases the positioning block 21. The sheath 201 to be drawn is installed in the second groove 2211 of the pressing block 22, and the core rod 200 is exposed out of the pressing piece 2. The first driving cylinder 24 controls the pressing block 22 to move towards the direction close to the positioning block 21, so that the sheath 201 to be drawn is clamped in the channel 23 formed by the positioning block 21 and the pressing block 22 in a surrounding manner, and the pressing piece 2 is pressed on the sheath 201 to be drawn. The core rod 200 is inserted into the collet 311 of the lock nib 31 and the locking sleeve 321 is adjusted to move continuously toward the end adjacent to the collet 311 so that the collet 311 is gradually tightened to lock the core rod 200 within the collet 311. And starting the second driving cylinder 40 to work, wherein the second driving cylinder 40 drives the piston rod 49 to drive the locking member 3 and the mandrel 200 to move towards one end close to the positioning block 44 in the axial direction under the guidance of the guide post 42, so that the mandrel 200 is drawn out from the sheath 201. After the mandrel 200 is completely separated from the sheath 201, the second driving cylinder 40 is closed, and the adjusting locking sleeve 321 is continuously moved toward the end away from the collet 311, so that the collet 311 is gradually expanded to unlock the mandrel 200 from the collet 311, so as to take out the mandrel 200. Subsequently, the first driving cylinder 24 drives the pressing block 22 to move in a direction away from the positioning block 21, and the sheath 201 is taken out.

The embodiment of the utility model provides a tube drawing device 100 not only separates sheath 201 and plug 200 easily, and can avoid the bending deformation of sheath appearance at the tube drawing in-process to the sheath is the straight line shape after guaranteeing the tube drawing. In addition, use the cylinder to drive clamping piece 2 and driving piece 4 at the tube drawing in-process, not only can provide even and adjustable packing force for pressing piece 2, for driving piece 4 provides even and adjustable tube drawing force to difficult damage sheath pipe, and compare manual tube drawing mode and greatly improved tube drawing efficiency.

Referring to fig. 17 and 18 together, fig. 17 is a schematic structural diagram of a pressing member 2a according to a second embodiment of the present invention, and fig. 18 is an exploded schematic structural diagram of the pressing member 2 a. In the present embodiment, the pressing member 2a includes a positioning block 21a and a pressing block 22a that are fitted to each other. The distance between the positioning block 21a and the pressing block 22a is adjustable. In contrast, the pressing block 22a is movable in the left-right direction with respect to the positioning block 21a (the left-right direction is determined by taking the extending direction of the sheath 201 and the core rod 200 as the forward-backward direction) to press or release the sheath located between the positioning block 21a and the pressing block 22 a; the pressing piece 2a further comprises an elastic pad 23a arranged between the positioning block 21a and the pressing block 22a, the positioning block 21a and the pressing block 22a jointly enclose a cavity 24a for accommodating the elastic pad 23a, and the sheath is clamped between the positioning block 21a and the elastic pad 23 a.

Specifically, in the present embodiment, the positioning block 21a is substantially L-shaped. The positioning block 21a is fixed on the bearing base in a threaded manner, and the pressing block 22a adjusts the distance from the positioning block 22a by driving an air cylinder or a motor. In other embodiments, the positions of the positioning block 21a and the pressing block 22a may also be adjusted at the same time to adjust the distance between the positioning block 21a and the pressing block 22 a.

The positioning block 21a includes a fixing portion 211a and a supporting portion 212a extending perpendicularly from an end of the fixing portion 211 a. The fixing portion 211a and the supporting portion 212a together form a housing space 213a housing the elastic pad 23 a. The fixing portion 211a is fixed to the supporting base by screws. Specifically, the fixing portion 211a is provided with screw holes 2111a through which screws pass in a direction perpendicular to a plane on which the load bearing base is placed. A concave groove 214a penetrating the receiving space 213a is formed at the boundary between the fixing portion 211a and the supporting portion 212 a. The inner concave groove 214a has an arc-shaped groove surface. In the present embodiment, the radial cross section of the concave groove 214a is substantially semicircular for accommodating a sheath to be drawn.

Optionally, in order to avoid the damage problem of the sheath during the tube drawing process, the groove surface of the concave groove 214a is provided with a flexible gasket. The flexible gasket may be attached to a part or all of the surface of the groove surface of the inner concave groove 214a by means of adhesion. The flexible gasket may be, but is not limited to, a silicone gasket, an asbestos gasket, a rubber gasket, a flexible graphene gasket, or a polytetrafluoroethylene gasket. It will be appreciated that other gaskets made of flexible material are also suitable for use with the present invention.

One side of the pressing block 22a close to the positioning block 21a is provided with a secondary stepped structure 221 a. The two-step structure 221a includes a first step structure 2211a and a second step structure 2212a formed by being retracted relative to the first step structure 2211 a. The first step 2211a is engaged with the elastic pad 23a, and the second step 2212a is engaged with the supporting portion 212a of the positioning block 21 a. One side of the pressing block 22a, which is far away from the positioning block 21a, is provided with an air cylinder. The cylinder drives the pressing block 22a to move toward or away from the positioning block 21a to press or release the sheath between the positioning block 21a and the pressing block 22 a.

It can be understood that, in this embodiment, the elastic pad 23a is clamped in the cavity 24a formed by the positioning block 21a and the pressing block 22a in a matching manner, so that the degree of fitting between the pressing piece 2a and the sheath to be drawn is enhanced, the friction force between the pressing piece 2a and the sheath to be drawn is increased, the clamping force on the sheath is increased, and the success rate of separating the core rod from the sheath is increased. The elastic pad 23a is substantially elongated, i.e., the elastic pad 23a has a substantially rectangular cross section. It can be understood that the thickness of the elastic pad 23a can be designed according to the sheath pipes to be drawn of different pipe diameters, so that the pipe drawing device is suitable for the pipe drawing requirements of the sheath pipes with different outer diameters. It can be understood that when the positioning block 21a is pressed against the pressing block 22a, the elastic pad 23a can be deformed, so that the sheath tube is clamped between the elastic pad 23a and the positioning block 21 a. Similarly, the central axis of the cylinder 45 of the second driving cylinder 40, the central axis of the piston rod 49, the central axis of the lock nozzle 31, the sheath tube pressed by the pressing piece 2a and the central axis of the core rod are located on the same straight line, so that the second driving cylinder 40 can provide the pulling force which is consistent with the axial direction of the core rod, the pulling force has even force, the core rod always moves along the axial direction in the tube drawing process, the sheath tube is always clamped along the axial direction, and after the tube is drawn, the straightness of the sheath tube is maintained, thereby avoiding the generation of bending deformation.

The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there may be changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.

Claims (16)

1. The utility model provides a tube drawing device for separation shaping back sheath pipe and quilt the plug of sheath pipe parcel, the rear end of plug exposes outward the sheath pipe, a serial communication port, tube drawing device including bear the base station, set up in bear and be used for compressing tightly on the base station the sheath pipe compress tightly the piece, set up in bear and be used for locking on the base station the retaining member of the rear end of plug and set up in bear on the base station and connect the driving piece of retaining member, the driving piece is automatic to be driven the retaining member with the plug is together followed the axial of sheath pipe and towards keeping away from the direction of sheath pipe is removed, so that the plug is followed extract in the sheath pipe.

2. The tube drawing device according to claim 1, wherein the pressing member includes a positioning block and a pressing block which are engaged with each other, the sheath tube is held between the positioning block and the pressing block, and a distance between the positioning block and the pressing block is adjustable.

3. The tube drawing device according to claim 2, wherein the positioning block is fixed to the supporting base, the pressing block is movably disposed on the supporting base, and the pressing block is movable relative to the positioning block in a direction perpendicular to a central axis of the sheath to press or release the sheath.

4. The tube drawing device according to claim 3, wherein the pressing block comprises a pressing portion, one side of the positioning block, which is close to the pressing block, is provided with an accommodating groove for accommodating the pressing portion, a first groove is formed in the bottom of the accommodating groove, a second groove is formed in the pressing portion, which corresponds to the first groove, and the first groove and the second groove cooperate to form a channel for clamping the sheath tube.

5. A pipe drawing device as claimed in claim 4, wherein the receiving grooves are through grooves, at least one of the groove walls of the receiving grooves is provided with a limiting opening penetrating through the groove wall, and the pressing part is provided with a limiting part adapted to the limiting opening.

6. A tube drawing device as claimed in claim 4, characterised in that flexible gaskets are provided in the first recess and/or the second recess.

7. A tube drawing device as claimed in claim 3, wherein the pressing member further includes an elastic pad disposed between the positioning block and the pressing block, the positioning block and the pressing block together enclose a cavity for accommodating the elastic pad, and the sheath tube is clamped between the positioning block and the elastic pad.

8. A tube drawing device as claimed in claim 1, wherein the locking member includes a locking nose for holding the mandrel, a locking sleeve disposed around the locking nose, and a connecting member connecting the locking nose and the driving member, the locking sleeve being axially movable relative to the locking nose to adjust the holding force of the locking nose on the mandrel.

9. A tube drawing device as claimed in claim 8, characterized in that the drive member comprises a drive cylinder and a piston rod connected to the drive cylinder, the free end of the piston rod being fixedly connected to the connecting member; the central axis of the piston rod, the central axis of the lock nozzle and the central axis of the sheath tube are positioned on the same straight line.

10. A tube drawing device as claimed in claim 9, wherein the front and rear ends of the locking mouth are respectively provided with a collet and a connector, the collet has elasticity, the locking sleeve comprises a connecting sleeve fixedly connected to the connector and a locking sleeve movably connected to the connecting sleeve, and the locking sleeve rotates relative to the connecting sleeve and moves axially relative to the collet so that the collet locks or releases the mandrel.

11. A tube drawing device as claimed in claim 10, wherein the collet includes at least two tapered collet blocks with a gap between adjacent tapered collet blocks to provide resilience, the outer diameter of the collet increases from an end distal from the core rod to an end proximal to the core rod, and the inner circumferential surface of the locking sleeve engages the outer circumferential surface of the collet.

12. A tube drawing device as claimed in claim 10, wherein the retaining member further comprises a mounting block, the coupling sleeve being fixedly attached to the mounting block; the driving piece further comprises a guide post, the mounting block is sleeved on the guide post in a sliding mode, and the central axis of the guide post is parallel to the central axis of the sheath tube so as to guide the locking piece and the core rod to move together along the axial direction of the sheath tube.

13. A tube drawing device as claimed in claim 12, wherein the mounting block is provided with a guide sleeve adapted to the guide post, the guide sleeve being slidably fitted over the guide post.

14. The tube drawing device according to claim 12, wherein the driving member further comprises a mounting plate and a positioning plate fixed to the supporting base, the mounting block is located between the mounting plate and the positioning plate, two ends of the guide post are fixed to the mounting plate and the positioning plate, respectively, and a notch is formed in the bottom of the mounting plate for the lock nozzle and the lock sleeve to pass through.

15. A tube drawing device as claimed in claim 14, wherein the guide post is sleeved with a first cushion pad and a second cushion pad, the first cushion pad being located between the mounting plate and the mounting block, the second cushion pad being located between the mounting block and the positioning plate.

16. A tube drawing device as claimed in claim 15, wherein an anti-collision sleeve is further sleeved on an end of the guide post close to the positioning plate, the anti-collision sleeve is located between the second cushion pad and the positioning plate, and an elastic member is connected to an end of the anti-collision sleeve close to the positioning plate.

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