CN211888448U

CN211888448U - Gauge-changing joint device for core rod of cold drawing machine

Info

Publication number: CN211888448U
Application number: CN202020260629.0U
Authority: CN
Inventors: 陶芳国; 罗赐成; 殷世标; 李明新
Original assignee: Hengyang Hongcheng High Pressure Cylinder Pipe Manufacturing Co ltd
Current assignee: Hengyang Hongcheng High Pressure Cylinder Pipe Manufacturing Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-11-10
Anticipated expiration: 2030-03-05

Abstract

The utility model discloses a gauge-changing joint device for a cold drawing machine core bar, which comprises an inner mold, a core bar and a gauge-changing joint device; the gauge changing connector device comprises a connector body, one end of the connector body is connected with one end of the core rod, a shaft sleeve is sleeved on the periphery of the connector body, an inner mold is sleeved on the periphery of the shaft sleeve, a nut is connected to the other end of the connector body, and the shaft sleeve and the inner mold are axially fixed on the connector body through the nut. The utility model has the advantages of low labor intensity, fast gauge changing time and simple operation.

Description

Gauge-changing joint device for core rod of cold drawing machine

Technical Field

The utility model belongs to the machining field especially relates to a cold drawing machine core bar trades rule piecing devices.

Background

The range of the steel pipe drawn by the existing large-scale cold drawing machine is very large, the diameter of the required internal mold is very large when a large-diameter steel pipe is drawn, and the diameter of the required internal mold is correspondingly smaller when a small-diameter steel pipe is drawn. Therefore, the inner hole diameter of the large inner die arranged on the core rod is also large, and the inner hole diameter of the small inner die is correspondingly small. It is now common practice to provide inner molds of different diameters with a core rod, or to connect a fitting at the front end of the core rod by means of a screw thread, to provide a large diameter inner mold with a large diameter fitting, and to provide a small diameter inner mold with a small diameter fitting.

The existing mode of replacing the internal mold is that a core rod is arranged on the internal mold with different diameters, the labor intensity of core rod replacement is high, the time for parking and gauge replacement is long, and the input cost is high. Or the front end of the core rod is connected with a joint through threads, internal molds of different specifications correspond to one joint, the corresponding joint needs to be replaced when the gauge is replaced every time, the joints are connected through the threads, the threaded joints are frequently disassembled and assembled, the thread abrasion is accelerated, meanwhile, each joint is over 20 kg, and the labor intensity of gauge replacement is high.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art, and providing a cold drawing core bar gauge changing joint device which has low labor intensity, quick gauge changing time and simple operation.

The technical scheme of the utility model is that: a cold drawing machine core rod gauge changing joint device comprises an inner die, a core rod and a gauge changing joint device; the gauge changing connector device comprises a connector body, one end of the connector body is connected with one end of the core rod, a shaft sleeve is sleeved on the periphery of the connector body, an inner mold is sleeved on the periphery of the shaft sleeve, a nut is connected to the other end of the connector body, and the shaft sleeve and the inner mold are axially fixed on the connector body through the nut.

The utility model discloses further technical scheme is: the joint body is connected with the core rod through threads.

The utility model discloses further technical scheme is: the joint body is a step shaft which is provided with a first step and a second step, one end of the first step is close to a thread connected with the core rod, the outer circumference diameter of the first step is matched with that of the core rod, the other end of the first step is connected with the second step, the outer circumference diameter of the second step is smaller than that of the first step, and the size of the second step is matched with that of the inner hole of the shaft sleeve.

The utility model discloses further technical scheme is: the shaft sleeve is provided with a circumferential protruding part, and the outer diameter of the circumferential protruding part is larger than that of the first step.

The utility model discloses further technical scheme is: the connector body is sleeved with an opening gasket which is positioned between the nut and the inner die, the outer diameter of the opening gasket is larger than the inner hole of the inner die, and the outer diameter of the nut is smaller than the inner hole of the inner die.

The utility model discloses further technical scheme is: and a space ring is sleeved between the periphery of the shaft sleeve and the inner hole of the inner die.

The utility model discloses further technical scheme is: the diameter of the inner hole of the space ring is larger than the outer diameter of the nut.

Compared with the prior art, the utility model has the following characteristics:

1. when the inner die with different diameters is replaced, the core rod does not need to be replaced, the inner die joint with the weight of 20 kg does not need to be replaced, and the inner die can be replaced only, so that the labor intensity is greatly reduced.

2. When the inner film is replaced each time, the time for replacing the joint is reduced by more than 10 minutes/time, and compared with the time for replacing the core rod, the time for replacing the core rod is saved by more than 10 minutes/time, so that the downtime is reduced, and the production efficiency is improved.

3. The invention can reduce the abrasion of the internal thread of the core rod end, greatly prolong the service life of the core rod and save the production cost.

The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the utility model with a middle inner mold replaced;

fig. 3 is a schematic structural view of the utility model replacing the large-size inner mold.

Detailed Description

Example 1

As shown in fig. 1, a gauge-changing joint device for a cold drawing machine core rod comprises an inner die 1, a core rod 2 and a gauge-changing joint device; in this embodiment, the inner mold 1 is a small-sized inner mold (the outer diameter thereof is 180mm, but other diameters are also possible as long as the outer diameter is smaller than the outer diameter of the core rod 2) in a ring shape.

Trade rule piecing devices including connecting the body 31, connect the body 31 and be the step axle, from left to have in proper order for the external screw thread that is connected with core bar 2, first step 311, second step 312 and the external screw thread that is connected with nut 33, first step 311 external diameter is the same size with the external diameter of core bar 2, the external diameter of second step 312 is less than first step 311 external diameter, its size and the hole of centre form 1 excessive cooperation, overlaps the small-size centre form 1 cover on second step 312, it alright to tighten nut 33.

As shown in fig. 2, when a medium-sized inner mold (in the embodiment, the outer diameter of the medium-sized inner mold is 200mm, but other diameters are also possible) is required to perform cold drawing, the nut 33 can be screwed off, the small-sized inner mold 1 is taken off, the shaft sleeve 32 is mounted on the second step 312 of the joint body 31, the shaft sleeve 32 is in an end cover shape, one end of the shaft sleeve 32 is provided with a circumferential protruding portion 321, the outer diameter of the protruding portion 321 is larger than the outer diameter of the first step 311 and smaller than the outer diameter of the medium-sized inner mold, the outer diameter of the shaft sleeve 32 is in transition fit with the inner hole of the medium-sized inner mold, and then the nut 33 is screwed on, so that the. Because the inner bore of the middle inner die is larger than that of the small inner die, the problem can be solved by adding the shaft sleeve 32.

As shown in fig. 3, similarly, when a large-size inner mold (in the embodiment, the outer diameter of the medium-size inner mold is 220mm, and of course, other diameters are possible) is required to perform cold drawing, the nut 33 may be unscrewed, the medium-size inner mold may be removed (of course, if the small-size inner mold is directly replaced with the large-size inner mold, the small-size inner mold is removed first, the upper sleeve 32 is mounted on the second step 312, the spacer ring 5 is sleeved on the sleeve 32, the large-size inner mold 1 is sleeved on the periphery of the spacer ring 5, and the nut 33 is tightened.

In order to rapidly replace the inner mold 1 (at this time, the inner mold 1 is a large-size inner mold or a medium-size inner mold), an opening gasket 4 can be arranged on the nut 33 and the inner mold 1, the outer diameter of the opening gasket 4 is larger than the diameter of the inner hole of the inner mold 1, the nut 33 with the smaller outer diameter is replaced at this time, the outer diameter of the nut 33 is smaller than the diameter of the inner hole of the spacer ring 5, and preferably smaller than the diameter of the inner hole of the shaft sleeve 32, so that the opening gasket 4 can be drawn out only by unscrewing the nut 33 without taking down the nut 33, and then the inner mold 1 or the spacer ring 5 can be.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize with other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

Claims

1. The utility model provides a cold drawing machine core bar trades rule piecing devices which characterized in that: the device comprises an internal mold (1), a core rod (2) and a gauge changing joint device; the gauge changing connector device comprises a connector body (31), one end of the connector body (31) is connected with one end of the core rod (2), a shaft sleeve (32) is sleeved on the periphery of the connector body, the inner die (1) is sleeved on the periphery of the shaft sleeve (32), the other end of the connector body (31) is connected with a nut (33), and the shaft sleeve (32) and the inner die (1) are axially fixed on the connector body (31) by the nut (33).

2. The cold drawing machine core bar gauge changing joint device according to claim 1, wherein: the joint body (31) is connected with the core rod (2) through threads.

3. The cold drawing machine core bar gauge changing joint device according to claim 2, wherein: the joint body (31) is a step shaft and is provided with a first step (311) and a second step (312), one end of the first step (311) is abutted against a thread connected with the core rod (2), the diameter of the outer periphery of the first step (311) is matched with that of the core rod (2), the other end of the first step (311) is connected with the second step (312), the diameter of the outer periphery of the second step (312) is smaller than that of the outer periphery of the first step (311), and the size of the second step (312) is matched with that of an inner hole of the shaft sleeve (32.

4. The cold drawing machine core bar gauge changing joint device according to claim 3, wherein: the shaft sleeve (32) is provided with a circumferential protruding part (321), and the outer diameter of the circumferential protruding part is larger than that of the first step (311).

5. The cold drawing machine core bar gauge changing joint device according to claim 1, wherein: the cover is equipped with opening gasket (4) on the connector body (31), and it is located between nut (33) and centre form (1), and the external diameter of opening gasket (4) is greater than the hole of centre form (1), the external diameter of nut (33) is less than the hole of centre form (1).

6. The cold drawing machine core bar gauge changing joint device according to claim 5, wherein: and a space ring (5) is sleeved between the periphery of the shaft sleeve (32) and the inner hole of the inner die (1).

7. The cold drawing machine core bar gauge changing joint device according to claim 6, wherein: the diameter of an inner hole of the space ring (5) is larger than the outer diameter of the nut (33).