CN211515690U - Quick change tool for core rod of pipe bending machine - Google Patents

Abstract

The utility model discloses a bending machine plug quick change frock belongs to the machining field. The tool comprises a core rod, a core rod connecting rod and a core rod connecting rod; one end of the mandrel connecting rod is in threaded connection with the mandrel, and the other end of the mandrel connecting rod is provided with a convex block or a groove; one end of the core rod connecting rod is in threaded connection with the core rod, and the other end of the core rod connecting rod is provided with a groove matched with the convex block of the core rod connecting rod or a convex block matched with the groove of the core rod connecting rod; the other end of the core rod connecting rod and the other end of the core rod connecting rod are positioned through a convex block and a groove, and the core rod connecting rod is fixedly connected with the core rod connecting rod. It can make the very big plug of weight and core bar realize quick centering, greatly promotes the change efficiency of plug, labour saving and time saving.

Description

Quick change tool for core rod of pipe bending machine

Technical Field

The utility model belongs to the technical field of machining, more specifically say, relate to a frock is changed in bending machine plug quick change.

Background

Machining refers to a process of changing the external dimensions or properties of a workpiece by a mechanical device, and bending of a pipe belongs to one type of machining. The bending machine is the most common bending apparatus for bending pipes, and when the bending machine is used to bend a pipe, in order to prevent the inner wall of the pipe from deforming and the inner diameter of the pipe from changing, a mandrel needs to be added into the bent pipe, so as to support the inner wall of the bending radius of the pipe and prevent the pipe from deforming.

Because the length of pipe fitting differs, when the bending part is far away from the port department of pipe fitting, the plug need stretch into longer distance in to the pipe fitting, consequently, the plug can carry out threaded connection with a core bar usually, and the length control plug that stretches into the core bar of pipe fitting is in the position of pipe fitting through the control. However, when processing large pipe fittings, the required core rod has a large volume, the length and diameter of the core rod are also large, and in order to prevent the two from deforming when the pipe fittings are bent, the two are usually made of metal with high quality and hardness, which results in the weight of the two being very large. When pipes with different inner diameters need to be machined, the replacement of the core rod is extremely troublesome.

When replacing the heavy core rod in the prior art, the core rod is usually fixed at a certain position, then the core rod is dispatched and transported by a navigation vehicle, then a worker holds the core rod to enable the threaded connection part of the core rod to be aligned with the threaded hole of the core rod, and then threaded connection is carried out after the alignment is accurate. However, since the core rod has a heavy weight, it is very difficult for a worker to perform centering, and once the core rod and the core rod are misaligned in advance, the threaded connection portion of the core rod cannot be screwed into the threaded hole of the core rod, and a large number of attempts are required.

For example, the Chinese patent application number is: CN201320419871.8, published date: a patent document 12 and 21 in 2013 discloses a mandrel component for a pipe bending machine, which comprises a bead core and a mandrel, wherein the bead core is in a spherical frustum shape, the mandrel comprises a bead core mounting rod and a connecting rod, the front end of the bead core mounting rod is provided with an axial first central hole, the rear end of the bead core mounting rod is provided with a second central hole communicated with the first central hole, and the aperture of the first central hole is smaller than that of the second central hole; the ball core mounting rod is characterized in that a threaded center hole is formed in the rotation center of the ball core, a connecting bolt is installed in the first center hole in a clearance fit mode and is connected with the threaded center hole of the ball core, a gap which is convenient for axial movement of the connecting bolt exists in front of the end portion of the ball core and the ball core mounting rod, the second center hole is connected with the front end of the connecting rod, a connecting hole is formed in the rear end of the connecting rod, and the central axes of the ball core mounting rod, the connecting rod, the first center hole and the second center hole. The core rod component supports the bending part of the pipe fitting when the pipe fitting is bent, so that the pipe fitting is not easy to flatten and deform, and meanwhile, the core rod component is easy to replace, and the cost is reduced.

Also, for example, the Chinese patent application number is: CN201220592562.6, published date: the patent literature on 19/6/2013 discloses a combined pipe bender ball pin assembly, which comprises a ball core and a core rod, wherein the ball core is connected with the core rod through a combined connecting piece, the combined connecting piece comprises a spherical rod, a connecting rod and a working rod, the working rod is in clearance fit through a base hole and is in threaded connection with the front end of the core rod, the connecting rod is installed in a middle hole of the working rod in a matched manner, the rear end of the connecting rod is connected and locked with the core rod through a locking bolt, the front end of the connecting rod is in linkage with the spherical rod through an inner spherical surface, and the spherical rod is in assembled connection with the ball core; the central axes of the spherical rod, the connecting rod, the working rod, the locking bolt and the mandrel rod are positioned on the same central line. This combination formula bending machine ball round pin assembly adopts combined type structure, when the ball round pin assembly gets into the wearing and tearing phase and need change, only needs to change the lower work lever of processing technology content, has remain the higher, difficult worn and torn core rod pole of processing cost, has avoided the whole abandonment of ball round pin assembly, has both practiced thrift the cost, has reduced the processing burden of accessory again, shortens the time of whole processing change, improves production efficiency.

Above-mentioned two kinds of bending machine plug all possesses easy to assemble's characteristics, however, all through threaded connection between the plug of the two and the core bar, when processing large-scale pipe fitting and must adopt size and the very big pipe fitting of weight, the same needs that exist the front-mentioned need with the shunting of navigation car, the difficulty of artifical centering is wasted time and energy, can not solve the problem that the plug of the front-mentioned change wastes time and energy.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

Need adopt very big plug of size and core bar to current bending machine when processing large-scale pipe fitting, lead to the centering installation difficulty of plug and core bar, the problem that the plug was changed and is wasted time and energy, the utility model provides a bending machine plug quick change frock, it can realize quick centering for the very big plug of weight and core bar, greatly promotes the change efficiency of plug, labour saving and time saving.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

A quick change tool for a core rod of a pipe bending machine comprises a core rod, a core rod connecting rod and a core rod connecting rod; one end of the mandrel connecting rod is in threaded connection with the mandrel, and the other end of the mandrel connecting rod is provided with a convex block or a groove; one end of the core rod connecting rod is in threaded connection with the core rod, and the other end of the core rod connecting rod is provided with a groove matched with the convex block of the core rod connecting rod or a convex block matched with the groove of the core rod connecting rod; the other end of the core rod connecting rod and the other end of the core rod connecting rod are positioned through a convex block and a groove, and the core rod connecting rod is fixedly connected with the core rod connecting rod.

As a further improvement of the technical scheme, the device also comprises a connecting sleeve; the connecting sleeve comprises a connecting rod sleeve and a locking sleeve; the connecting rod sleeve is formed by splicing two identical semi-cylindrical connecting rod sleeve components, a cavity is arranged in the connecting rod sleeve, and the cavity is matched with the connecting part of the core rod connecting rod and the core rod connecting rod; the outer side wall of the connecting rod sleeve is provided with threads, and the locking sleeve is axially provided with a threaded hole matched with the threads of the connecting rod sleeve.

As a further improvement of the technical proposal, the diameter of the connecting part of the mandrel connecting rod and the core rod connecting rod is larger than the diameter of the mandrel connecting rod and the core rod connecting rod connected with the connecting part.

As a further improvement of the technical scheme, at least one pair of core rod adjusting screw holes are symmetrically arranged at the position, close to the core rod connecting rod, on the side surface of the core rod along the axis of the core rod, and the core rod adjusting screw holes are perpendicular to the axis of the core rod.

As a further improvement of the technical scheme, at least one pair of core rod adjusting screw holes are symmetrically arranged at the position, close to the core rod, on the side surface of the core rod connecting rod along the axis of the core rod connecting rod, and the core rod adjusting screw holes are vertical to the axis of the core rod connecting rod.

As a further improvement of the technical scheme, the core rod connecting rod and the core rod are respectively provided with through holes penetrating through the upper end surface and the lower end surface of the core rod connecting rod, the core rod connecting rod and the core rod along respective axes.

A method for replacing a core rod of a pipe bending machine adopts the quick change tool for the core rod of the pipe bending machine, and comprises the following steps:

firstly, fixing a core rod, and then, respectively connecting a core rod connecting rod and a core rod connecting rod with the core rod and a core rod through threads and then locking the core rod and the core rod;

and secondly, moving the core rod connecting rod to ensure that the convex blocks and the grooves of the core rod connecting rod and the core rod connecting rod are matched, and then fixedly connecting the core rod connecting rod and the core rod connecting rod.

As a further improvement of the technical solution, in the second step, the specific steps of fixedly connecting the core rod connecting rod and the core rod connecting rod are as follows: after the convex blocks of the core rod connecting rod and the core rod connecting rod are clamped into the grooves, the two connecting rod sleeve assemblies are controlled to coat the connecting part of the core rod connecting rod and the core rod connecting rod to form a connecting rod sleeve, and then the locking sleeve is controlled to be in threaded connection with the connecting rod sleeve along the axial direction of the connecting rod sleeve.

As a further improvement of the technical scheme, the method also comprises the following steps: after the core rod is connected with the core rod connecting rod in a threaded manner, a long rod is firstly inserted into the axial through holes of the core rod, the core rod connecting rod and the core rod connecting rod in sequence, and then the core rod, the core rod connecting rod and the core rod connecting rod are connected.

As a further improvement of the technical scheme, when the core rod is connected with the core rod connecting rod and the core rod is connected with the core rod connecting rod, screws are screwed into the core rod adjusting screw holes and the core rod adjusting screw holes respectively, and the core rod connecting rod and the core rod are tightly jacked.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model relates to a quick change tool for a pipe bender mandrel, which skillfully converts the connection of the mandrel and the mandrel from the mode of threaded connection with higher centering requirement into the mode of fixture block positioning and then fixed connection by arranging the mandrel connecting rod and the mandrel connecting rod with a lug or a groove, so that the mandrel and the mandrel with extremely large weight can be connected without pre-centering with high precision requirement, and the efficiency of mandrel replacement is greatly improved;

(2) the utility model relates to a bending machine plug quick change frock, the diameter of the coupling part of plug connecting rod and core bar connecting rod is greater than the diameter of the plug connecting rod and core bar connecting rod of both sides that link to each other with it, be the outstanding round platform echelonment structure at the connection position promptly, the connecting rod cover subassembly of cladding connection position and the lock sleeve that becomes the connecting rod cover with the locking of connecting rod cover subassembly again cooperate, make the connection of plug connecting rod and core bar connecting rod very convenient, and connect firmly, in addition, the connecting rod cover outside screw thread and threaded hole's lock sleeve still play the corrective action to the axiality of plug connecting rod and core bar connecting rod when threaded connection, improve the axiality of the two, thereby indirectly improve the axiality of plug and core bar;

(3) the utility model relates to a quick change tool for a core rod of a pipe bending machine, when the core rod is in threaded connection with a core rod connecting rod, a core rod and a core rod connecting rod, a screw can be screwed in the side surfaces of the core rod and the core rod connecting rod and can be propped against a screw rod in a threaded hole in a joint, on one hand, the position of the screw rod in the threaded hole in the radial direction of the core rod or the core rod connecting rod can be adjusted by controlling the length of the screwed-in screw, so that the two connected components are aligned accurately, and on the other hand;

(5) the utility model relates to a quick change tool for a core rod of a pipe bending machine, wherein through holes which run through respective upper and lower end surfaces are respectively arranged on a core rod connecting rod, a core rod connecting rod and a core rod along respective axes, and a long rod can be inserted into the through holes of the axes before installation, thereby realizing the prepositioning of the core rod connecting rod, the core rod connecting rod and the core rod, improving the installation efficiency and the installation precision and saving the replacement time of the core rod;

(6) the utility model relates to a bending machine plug replacement method adopts above-mentioned bending machine plug quick change frock, can improve the change efficiency of big weight plug effectively, saves the change time.

Drawings

Fig. 1 is a schematic view of the overall structure of a quick-change tool;

FIG. 2 is a partial enlarged view of the front end of the quick-change tooling;

FIG. 3 is a cross-sectional view taken along the axial direction of the core rod of FIG. 2;

FIG. 4 is an enlarged partial view of the core rod link and core rod link connection of FIG. 3;

FIG. 5 is a partial enlarged view of the front end part of the quick-change tooling without the connecting sleeve;

FIG. 6 is a schematic structural view of a connecting rod cover;

FIG. 7 is a schematic structural view of a connecting rod bushing assembly;

FIG. 8 is a schematic view of a mandrel connecting rod configuration;

FIG. 9 is a schematic structural view of a core rod link;

in the figure: 1. a core rod; 11. adjusting screw holes of the core rod; 2. a core bar; 3. a mandrel connecting rod; 4. a core bar connecting rod; 41. a core rod adjusting screw hole; 5. connecting sleeves; 51. a connecting rod sleeve; 511. a connecting rod sleeve assembly; 52. a locking sleeve; 53. a connecting site; 6. a central shaft hole.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings.

Example 1

The utility model provides a bending machine plug quick change frock, the change of the very big pipe bender plug of mainly used weight, when solving the very big pipe bender plug of weight and changing, need the navigation car to transfer the same very big core bar of weight, the artifical centering in advance of holding the core bar again and carrying out the junction, the operation is got up very difficultly, the problem that wastes time and energy. As shown in fig. 1 and 5, the quick-change tool mainly includes a mandrel 1, a core rod 2, a mandrel connecting rod 3, a mandrel connecting rod 4, and a connecting sleeve 5, wherein the mandrel 1 and the core rod 2 are main working components of a mandrel of a tube bending machine, and the mandrel connecting rod 3, the mandrel connecting rod 4, and the connecting sleeve 5 are important components for realizing quick connection and installation of the mandrel 1 and the core rod 2 with extremely large weight. The specific structure, connection and operation of the various components are described in detail below.

As shown in fig. 2 to 5, the mandrel 1 has substantially the same structure as a commercially available mandrel for a pipe bending machine, and has an overall cylindrical structure, a front end that is a portion that extends into a pipe to be bent and contacts a bending portion, and a threaded hole that extends in the axial direction of the mandrel 1 at a central position of a rear end surface. The core rod 2 is a cylindrical long rod-shaped structure, and external threads are arranged on the outer side face of one end of the core rod 2. And in match, the outer side surface of one end of the core rod connecting rod 3 is provided with an external thread matched with the threaded hole of the core rod 1, and the center of the end surface of one end of the core rod connecting rod 4 is provided with a threaded hole which extends along the axial direction of the core rod connecting rod 4 and is matched with the external thread of the core rod 2. When the core rod needs to be replaced, the core rod connecting rod 3 is connected with the core rod 1 in a threaded mode and then locked through the nut, the core rod connecting rod 4 is connected with the core rod 2 in a threaded mode and then locked through the nut, and the core rod connecting rod 3 is fixedly connected with the core rod connecting rod 4, so that the core rod 1 can be fixedly connected with the core rod 2.

However, if the core rod 3 and the core rod 4 are connected by conventional screw threads, the pre-centering is also difficult due to the heavy weight of the core rod 2, and it is difficult to ensure the coaxiality of the core rod 3 and the core rod 4 without adopting the screw threads, thereby affecting the coaxiality of the core rod 1 and the core rod 2. In view of the above, in the present embodiment, the core rod connecting rod 3 and the core rod connecting rod 4 are specially designed with respect to the structures of the other ends of the core rod 1 and the core rod 2, and then are fastened and fixed by the connecting rod sleeve 5, so that the two can be connected together skillfully without high-precision screw pre-centering, and the coaxiality of the two is also ensured.

Specifically, the end faces of the core rod connecting rod 3 and the core rod connecting rod 4 opposite to the other ends of the core rod 1 and the core rod 2 are respectively provided with a convex block and a concave groove which are matched with each other, the convex block or the concave groove can be arranged on any one of the core rod connecting rod 3 and the core rod connecting rod 4, and only one of the other end faces of the core rod connecting rod 3 and the other end face of the core rod connecting rod 4 needs to be provided with the convex block, and the other end face. As shown in fig. 8 and 9, in the present embodiment, a projection is provided on the other end surface of the rod link 3, and a groove is provided on the other end surface of the rod link 4, and the projection and the groove are matched in shape and size. When the core rod connecting rod 3 and the core rod connecting rod 4 need to be connected, the connecting positions of the core rod connecting rod 3 and the core rod connecting rod 4 can be positioned only by clamping the convex block into the groove, and the core rod connecting rod 3 and the core rod connecting rod 4 do not need to be centered in advance in threaded connection, so that the connection is convenient and fast. And then the core rod connecting rod 3 and the core rod connecting rod 4 are locked and connected through a connecting sleeve 5.

As shown in fig. 4, the connecting sleeve 5 includes a connecting rod sleeve 51 and a locking sleeve 52. The connecting rod sleeve 51 is formed by splicing two identical semi-cylindrical connecting rod sleeve components 511, and the two connecting rod sleeve components 511 are not directly connected, but are fixed by a locking sleeve 52 to form the connecting rod sleeve 51. Specifically, the connecting rod sleeve 51 has a cavity therein that can accommodate the connecting portion 53 of the core rod link 3 and the core rod link 4, and the front and rear ends of the cavity are through holes for accommodating the core rod link 3 and the core rod link 4 on both sides of the connecting portion 53.

It should be noted that in order to allow the attachment location 53 to be properly located within the cavity without moving axially, thereby causing the rod link 3 and the rod link 4 to separate, the diameter at the attachment location 53 needs to be larger than the diameter of the rod link 3 and the rod link 4 to which it is attached, and the diameter of the through-hole at the front and rear ends of the cavity and the diameter of the portion of the rod link 3 and the rod link 4 to which the attachment location 53 is attached remain substantially the same. This configuration can be achieved in a variety of ways, such as by providing slots in the rod links 3 and 4 on either side of the connection 53, or by maintaining the diameters of the rod links 3 and 4 on either side of the connection 53 constant so that the diameter of the connection 53 is greater than the diameters on either side. In the former method, as shown in fig. 8 and 9, the core rod connecting rod 3 and the core rod connecting rod 4 on both sides of the connecting portion 53 are circumferentially provided with a circle of grooves, and after the protrusions and the grooves of the core rod connecting rod 3 and the core rod connecting rod 4 are engaged, a protruding truncated cone step structure is formed at the connecting portion 53. The connecting rod bushing assembly 511 is of a semi-cylindrical structure as shown in fig. 7, a semi-cylindrical groove is formed in the middle of the connecting rod bushing assembly 511, a semi-cylindrical groove with a smaller diameter is formed in two sides of the connecting rod bushing assembly 511, the connecting rod bushing 51 as shown in fig. 7 is formed after the two connecting rod bushing assemblies 511 are spliced together, a middle cavity of the connecting rod bushing 51 is matched with the connecting part 53, the connecting part 53 is just accommodated in the cavity after the connecting part 53 is coated by the two connecting rod bushing assemblies 511, and the axial displacement of the connecting part 53 can be limited by avoiding steps between the cavity and the front and rear through holes, so that the mandrel connecting rod 3 and the mandrel connecting rod 4 are prevented.

In addition, in the present embodiment, the protrusions and the grooves of the core rod link 3 and the core rod link 4 are further provided with a polygonal structure that can restrict the rotation of the core rod link 3 relative to the core rod link 4, and the present embodiment is a quadrangle, so that it can be prevented that the rotation of the core rod link 3 and the core rod link 4 at the relative positions during the operation of the core rod causes the rotation of the core rod 1 and the core rod 4 at the relative positions, which affects the operation effect of the core rod 1.

As shown in fig. 3 and 6, the locking sleeve 52 is a cylindrical structure, and has a threaded hole axially formed in an end surface thereof to communicate with the two end surfaces, the outer side surface of the connecting rod sleeve 51 is provided with an external thread engaged with the threaded hole, and one end of the connecting rod sleeve 51 is provided with a protruding circle of stepped truncated cone. After the connecting part 53 is covered and spliced by the two connecting rod sleeve assemblies 511 to form the connecting rod sleeve 51, the locking sleeve 52 is screwed into the connecting rod sleeve 51 along the axial direction from the end without the circular truncated cone to be locked after touching the circular truncated cone, and the two connecting rod sleeve assemblies 511 are fixed together, so that the core rod connecting rod 3 and the core rod connecting rod 4 are fixedly connected. It is worth mentioning that the coaxiality of the core rod connecting rod 3 and the core rod connecting rod 4 is not guaranteed well when the core rod connecting rod 3 and the core rod connecting rod 4 are spliced together, and when the locking sleeve 52 is screwed into the connecting rod sleeve 51, the correcting function of the coaxiality of the core rod connecting rod 3 and the core rod connecting rod 4 can be achieved while screwing in, so that the coaxiality of the core rod 1 and the core rod 2 is indirectly improved.

When the quick-change tool is used for replacing the core rod 1, the core rod connecting rod 3 and the core rod connecting rod 4 are connected with the core rod 1 and the core rod 2 through threads respectively, and then the core rod connecting rod 3 and the core rod connecting rod 4 are positioned through the convex block and the groove and locked through the connecting sleeve 5. The core rod connecting rod 3 and the core rod connecting rod 4 are light in weight, the core rods 1 and the core rods 2 can be manually installed on the core rods, centering is simple, and when the combination of the core rod connecting rod 4 and the core rod 2 with the great weight and the combination of the core rods 1 and the core rod connecting rod 3 are installed together, positioning through the convex blocks and the grooves is far simpler than pre-centering of threads, so that a great amount of core rod replacing time can be saved, and manpower and material resources are reduced.

In order to further improve the accuracy of the installation of the core rod 2, the core rod link 4 and the core rod link 3, especially the fitting accuracy of the projection and the groove when the core rod link 4 and the core rod link 3 are positioned, in this embodiment, through holes penetrating through the upper and lower end surfaces of the core rod link 3, the core rod link 4 and the core rod 2 are respectively arranged on the end surfaces along the respective axes, and the through holes of the three form a central shaft hole 6 as shown in fig. 3 after the installation. Before the installation, insert a stock in the through-hole of three in proper order from the rear end of core bar 2, realize prepositioning between the three, make core bar connecting rod 4 can more accurately with 2 threaded connection of core bar, and also can agree with more accurately between the lug of core bar connecting rod 3 and core bar connecting rod 4 and the recess, can not take place too big position and slide, make things convenient for adapter sleeve 5 to lock the two, improve installation effectiveness and installation accuracy. It should be noted that the diameters of the central axial through-holes of the core rod connecting rod 3, the core rod connecting rod 4 and the core rod 2 should be kept consistent so that the pre-positioning of the long rod on the three is sufficiently accurate.

In addition, as shown in FIGS. 2 and 3, this embodiment also has at least one pair of core rod adjustment screw holes 41 symmetrically provided along the axis of the core rod link 4 at a position on the side surface of the core rod link 4 near the core rod 2, the core rod adjustment screw holes 41 being perpendicular to the axis of the core rod link 4. Similarly, at least one pair of core rod adjusting screw holes 41 are symmetrically arranged on the side surface of the core rod connecting rod 4 near the core rod 2 along the axis of the core rod connecting rod 4, and the core rod adjusting screw holes 41 are perpendicular to the axis of the core rod connecting rod 4. When the core rod 1 and the core rod connecting rod 3, the core rod 2 and the core rod connecting rod 4 are in threaded connection, the screws can be screwed into the side surfaces of the core rod 1 and the core rod connecting rod 3 and abut against the screw rods in the threaded holes in the connection positions, on one hand, the positions of the screw rods in the threaded holes in the radial direction of the core rod 1 or the core rod connecting rod 3 can be adjusted by controlling the length of the screwed screws, so that the two parts are accurately centered, and on the other hand, the effect of reinforcing connection is achieved.

In conclusion, the quick change tool for the core rod of the pipe bending machine can realize quick centering on the core rod with the extremely large weight and the core rod, greatly improves the replacement efficiency of the core rod, and is time-saving and labor-saving.

Example 2

A method for replacing a core rod of a pipe bending machine, which adopts the core rod connecting tool of the pipe bending machine in embodiment 1, and comprises the following steps:

firstly, after a core rod 1 to be replaced is horizontally fixed at a position, a threaded end of a core rod connecting rod 3 is screwed into a threaded hole of the core rod 1 and is locked by a nut. Then, the core rod 2 is fixed at a position, a long rod is inserted into the through hole of the core rod 2, one end of the core rod connecting rod 4 to be threaded hole is sleeved on the long rod, the long rod is inserted into the through hole of the core rod connecting rod 4, and then the core rod connecting rod 4 is controlled to be in threaded connection with the core rod 2 and locked through a nut. In the step, the core rod connecting rod 3 and the core rod connecting rod 4 are only used as intermediate transitional connecting components, so that the size is small, the weight is small, and the core rod connecting rod 3 and the core rod connecting rod 4 can be successfully connected with the core rod 1 and the core rod 2 through threads manually or by adopting a simple tool. Meanwhile, when the core rod 1 is connected with the core rod connecting rod 3 and the core rod 2 is connected with the core rod connecting rod 4, screws are screwed into the core rod adjusting screw hole 11 and the core rod adjusting screw hole 41 respectively and tightly push the core rod connecting rod 3 and the core rod 2, the position of a screw rod in a threaded hole in the radial direction of the core rod 1 or the core rod connecting rod 3 can be adjusted by controlling the length of the screwed screw, so that the threaded connection is smoother, and the effect of reinforcing the connection can be achieved after the screw rod is tightly pushed.

Secondly, after the locking sleeve 52 is sleeved on the core rod connecting rod 4, the core rod 1 and the core rod connecting rod 3 are dispatched and transported through a navigation vehicle, or the core rod 2 and the core rod connecting rod 4 are hoisted, so that a long rod extending out of one end of the through hole of the core rod connecting rod 4 is inserted into the through hole of the core rod connecting rod 3, and then a convex block of the core rod connecting rod 3 is clamped into a groove of the core rod connecting rod 4 along the long rod. Then, the two link bush assemblies 511 cover the connecting portion 53 of the core rod link 3 and the core rod link 4 to form the link bush 51, and then the locking bush 52 is controlled to be screwed into the link bush 51 from one end of the link bush 51 not including the circular step ladder in the axial direction of the link bush 51, and the link bush 51 is locked after abutting against the circular step ladder, thereby fixedly connecting the core rod link 3 and the core rod link 4 together. Through the mode, the threaded connection of the core rod 1 and the core rod 2 with higher centering precision is changed into the clamping and positioning of the convex block and the groove from the threaded connection which needs to be centered in advance, the positioning is convenient and fast, the replacement efficiency of the core rod with heavy weight is effectively improved, the replacement time is saved, meanwhile, the coaxiality of the core rod 1 and the core rod 2 can be well ensured by screwing the locking sleeve 52 into the connecting rod sleeve 51, and the working effect of the replaced core rod is ensured.

In summary, in the method for replacing the core rod of the pipe bending machine according to the embodiment, the core rod quick-change tool according to the embodiment 1 is adopted, so that the core rod with the extremely large weight can be quickly replaced, the replacement time is saved, and the working efficiency is improved.

The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (6)

1. The utility model provides a bending machine plug quick change frock, includes plug (1) and core bar (2), its characterized in that: the core rod connecting rod structure further comprises a core rod connecting rod (3) and a core rod connecting rod (4); one end of the mandrel connecting rod (3) is in threaded connection with the mandrel (1), and the other end of the mandrel connecting rod is provided with a convex block or a groove; one end of the core rod connecting rod (4) is in threaded connection with the core rod (2), and the other end of the core rod connecting rod (4) is provided with a groove matched with the convex block of the core rod connecting rod (3) or a convex block matched with the groove of the core rod connecting rod (3); the other end of the core rod connecting rod (3) and the other end of the core rod connecting rod (4) are positioned through a convex block and a groove, and the core rod connecting rod (3) is fixedly connected with the core rod connecting rod (4).

2. The quick-change tooling for the mandrel of the pipe bender according to claim 1, characterized in that: the device also comprises a connecting sleeve (5); the connecting sleeve (5) comprises a connecting rod sleeve (51) and a locking sleeve (52); the connecting rod sleeve (51) is formed by splicing two identical semi-cylindrical connecting rod sleeve components (511), a cavity is arranged in the connecting rod sleeve (51), and the cavity is matched with a connecting part (53) of the core rod connecting rod (3) and the core rod connecting rod (4); the outer side wall of the connecting rod sleeve (51) is provided with threads, and the locking sleeve (52) is provided with a threaded hole matched with the threads of the connecting rod sleeve (51) along the axial direction.

3. The quick-change tooling for the mandrel of the pipe bender according to claim 2, is characterized in that: the diameter of the connecting part (53) of the core rod connecting rod (3) and the core rod connecting rod (4) is larger than the diameter of the core rod connecting rod (3) and the core rod connecting rod (4) connected with the connecting part (53).

4. The quick change tooling for the mandrel of the pipe bending machine according to any one of claims 1 to 3, is characterized in that: the side surface of the core rod (1) close to the core rod connecting rod (3) is symmetrically provided with at least one pair of core rod adjusting screw holes (11) along the axis of the core rod (1), and the core rod adjusting screw holes (11) are vertical to the axis of the core rod (1).

5. The quick change tooling for the mandrel of the pipe bending machine according to any one of claims 1 to 3, is characterized in that: at least one pair of core rod adjusting screw holes (41) are symmetrically arranged on the side surface of the core rod connecting rod (4) close to the core rod (2) along the axis of the core rod connecting rod (4), and the core rod adjusting screw holes (41) are vertical to the axis of the core rod connecting rod (4).

6. The quick change tooling for the mandrel of the pipe bending machine according to any one of claims 1 to 3, is characterized in that: the core rod connecting rod (3), the core rod connecting rod (4) and the core rod (2) are respectively provided with through holes penetrating through the upper end face and the lower end face of each core rod along the respective axis.

Images