WO2022105427A1

WO2022105427A1 - Automatic roll-changing apparatus and method for continuous pipe rolling mill

Info

Publication number: WO2022105427A1
Application number: PCT/CN2021/120568
Authority: WO
Inventors: 周超群; 穆东; 王建辉; 覃宣; 肖伟; 欧阳建
Original assignee: 中冶赛迪工程技术股份有限公司; 中冶赛迪技术研究中心有限公司
Priority date: 2020-11-18
Filing date: 2021-09-26
Publication date: 2022-05-27
Also published as: CN112404137A

Abstract

Provided are an automatic roll-changing apparatus and method for a continuous pipe rolling mill; the roll-changing apparatus comprises a drive arm (4), a first drive (5), a second drive (7), a swing arm (8), and a support arm (9), arranged on a support member (10); one end of the drive arm is connected to the first drive, and the other end acts on a drive shaft (2) and is used for retracting the drive shaft to disengage or extending it to reset its position; one end of the swing arm is connected to the second drive, and the other end is connected to one end of the support arm; the other end of the bracket arm acts on the drive shaft and is used for holding the drive shaft when it is retracted and disengaged or extended and reset; a position detection element (6) is disposed on each of the first drive and the second drive. Also provided is an automatic roll-changing method for a continuous pipe rolling mill. The present roll-changing apparatus and roll-changing method can improve the positioning accuracy of the drive shaft, and automatic joining is possible without manually checking the shaft alignment, achieving full automation of the process of changing rolls in a continuous pipe rolling mill, shortening the roll change time and increasing production efficiency.

Description

Automatic roll changing device and method for continuous rolling mill

technical field

The invention belongs to the technical field of metallurgical steel rolling, and in particular relates to an automatic roll changing device and method for a continuous rolling mill.

Background technique

The connection between the reducer and the rolls of the steel pipe continuous rolling mill is a retractable drum-shaped toothed transmission shaft. The shaft body is hollow inside, and there is a set of spring components in it. When changing rolls, the drive shaft is supported by the support member, and the drive shaft is driven to retract the connection between the disengagement and the rolls to make way for the roll changing channel of the stand. On the operating side, there is a hydraulically driven stand replacement mechanism for accepting old stands pulled from the rolling mill and loading new ones. When the new frame is pushed in, the spring compressed inside the shaft automatically rebounds, and the drive shaft extends and connects with the roll. However, the spring often encounters various resistances during operation, making the position of the drive shaft uncertain. In addition, the three rolls of the three-roll mill for steel pipes are arranged at 120° to each other. Due to structural and space constraints, support members cannot be provided on the shaft head near the roll side. Therefore, when changing rolls, the drive shaft can only be disengaged at the drum teeth. In the process of connecting the drive shaft and the roll, the positioning accuracy of the drive shaft is not high, which makes the docking difficult; at the same time, due to the small backlash of the drum teeth, the docking of the drum teeth is also difficult, and manual operation is required in actual operation. Go to the shaft head side of the coupling to observe the connection of the shaft, and communicate with the console through the walkie-talkie, which affects the replacement efficiency.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide an automatic roll changing device and method for a continuous rolling mill, which aims to solve the problems of low automation, long time consumption and low efficiency in the rolling process of the continuous rolling mill.

The present invention is achieved through the following technical solutions:

The invention provides an automatic roll changing device for a continuous rolling mill, comprising a drive arm, a first drive, a second drive, a swing arm and a support arm arranged on a support member, one end of the drive arm is connected to the first drive, and the drive arm is connected to the first drive. The other end acts on the drive shaft and is used to retract the drive shaft to disengage the roll stand from the drive shaft or reset the drive shaft to engage the roll stand with the drive shaft; one end of the swing arm is connected to the second drive, and the other end of the swing arm is connected to the second drive. It is connected with one end of the support arm; the other end of the support arm acts on the drive shaft and is used to hold the drive shaft when the roll stand and the drive shaft are disengaged and engaged, and the first drive and the second drive are provided with position detection elements .

Further, the length of the swing arm is greater than the length of the support arm.

Further, the length of the swing arm is more than 1.5 times the length of the support arm.

Further, the hydraulic system of the first drive and the second drive is provided with a hydraulic lock and a proportional valve interlocked with the position detection element.

Further, the driving arm is provided with a roller acting on the transmission shaft, and the transmission shaft is provided with a clamping groove which is matched with the roller along its axial direction.

Further, both ends of the clamping slot are respectively provided with retracting side chucks and extending side chucks for stopping the rollers.

Further, the drum-shaped tooth end of the drive shaft facing the roll stand has a chamfered modification and is provided with a guide section; the outer teeth of the drum-shaped teeth and the inner gear sleeve that meshes with the outer teeth are provided with tooth tops. Or the positioning block at the corresponding position of the tooth root.

Further, it also includes a frame replacement mechanism, which is mainly composed of a roll changing trolley, a traverse drive, and a longitudinal drive. Two; the traverse drive is used to move the roll changing trolley; the longitudinal drive is used to push and pull the roll stand.

The present invention also provides an automatic roll changing method for a continuous rolling mill. Based on the above roll changing device, the method includes the following steps: 1), the second drive urges the swing arm to drive the support arm to support the transmission shaft; 2), the first A drive prompts the drive arm to retract and disengage the drive shaft; 3), the stand replacement mechanism pulls out the roll stand to be replaced that is disengaged from the drive shaft, and pushes into a new roll stand; 4), positioning control The support arm supports the transmission shaft; 5), the first drive prompts the drive arm to extend and reset the transmission shaft to engage with the new roll stand; 6), release the first drive and the second drive.

Preferably, step 5) further includes the following steps: 5.1), the drum tooth of the drive arm is stopped at the drive shaft by the position detection element on the first drive and is about to contact the corresponding roll on the roll stand; 5.2), rotate Drive shaft to align the drum teeth; 5.3), continue to extend the drive shaft by the drive arm for reset engagement.

The advantages of the present invention are:

1. The roller changing device of the present invention designs two sets of drive structures for the drive shaft, one set can actively drive the drive shaft to retract and disengage and extend to reset, and the other set can hold the drive shaft when the drive shaft is retracted or extended, and The position controllability of the transmission shaft is implemented by the position detection element, which is beneficial to realize the active and precise reset engagement of the transmission shaft.

2. The roller changing device of the present invention can greatly improve the positioning accuracy of the transmission shaft by designing the length of the swing arm supporting the transmission shaft to be much larger than the length of the supporting arm.

3. The roller changing device of the present invention can make the transmission shaft stay at any position by setting the interlocking position detection element and the hydraulic lock, so that the transmission shaft can first realize the alignment of the drum teeth before the connection, and then automatically engage, which greatly improves the performance. production efficiency.

In general, the roll changing device and method involved in the present invention can realize the full automation of the roll changing process of the continuous pipe rolling mill, shorten the roll changing time of the continuous steel pipe rolling mill, and improve the production efficiency.

Other advantages, objects and features of the present invention will be set forth in the description which follows, to the extent that will be apparent to those skilled in the art based on a study of the following, or may be learned from is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a roll changing device of the present invention.

FIG. 2 is a schematic structural diagram of a partial transmission shaft and a support member in FIG. 1 .

3 is a schematic plan view of the roll changing device of the present invention.

Reference numerals: 1 is the roll stand, 2 is the transmission shaft, 3 is the slot, 4 is the drive arm, 5 is the first drive, 6 is the position detection element, 7 is the second drive, 8 is the swing arm, 9 is the Support arm, 10 is a supporting member, 11 (11a, 11b) is a roller changing trolley, 12 is a transverse drive, 13 is a longitudinal drive; 2a is an inner gear sleeve, 2b is an outer tooth; 3a is the retracting side chuck, 3b is the extension side chuck.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

As shown in FIGS. 1 and 2 , the automatic roll changing device of the continuous rolling mill mentioned in this embodiment is used to realize the disengagement and engagement between the roll stand 1 and the transmission shaft 2 , including the Drive arm 4 , first drive 5 , second drive 7 , swing arm 8 and support arm 9 , one end of drive arm 4 is connected to first drive 5 , and the other end acts on transmission shaft 2 and is used to retract transmission shaft 2 In order to disengage the roll stand 1 from the drive shaft 2 or reset the drive shaft 2 to engage the roll stand 1 with the drive shaft 2; Connection; the other end of the support arm 9 acts on the drive shaft 2 and is used to hold the drive shaft 2 when the roll stand 1 and the drive shaft 2 are disengaged and engaged; the first drive 5 and the second drive 6 are provided with positions The detection elements 6 all use hydraulic cylinders and are equipped with corresponding hydraulic systems. By adopting the above scheme, the roller changing device designs two sets of drive structures for the drive shaft, one set can actively drive the drive shaft to retract and disengage and extend to reset, and the other set can hold the drive shaft when the drive shaft retracts or extends, The position of the transmission shaft is controllable through the position detection element, which is beneficial to realize the active and precise reset engagement of the transmission shaft.

In this embodiment, the length L ₁ of the swing arm 8 is greater than the length L ₂ of the support arm 9 , especially the length of the swing arm 8 is more than 1.5 times the length of the support arm 9 , that is, L ₁ ≥ 1.5L ₂ , so that the transmission shaft When swinging at the same angle, the displacement value of the second drive is larger, which can greatly improve the positioning accuracy of the transmission shaft.

In this embodiment, the hydraulic system of the first drive 5 and the second drive 7 is provided with a hydraulic lock and a proportional valve interlocked with the position detection element 6, so that the transmission shaft can stay at any position, and the transmission shaft can be stopped before docking. The drum teeth can be aligned first, and then automatically engaged, which greatly improves the production efficiency.

In this embodiment, the drive arm 4 is provided with a roller (not marked) that acts on the transmission shaft 2, and the transmission shaft 2 is provided with a clamping groove 3 which is matched with the roller along its axial direction, and the clamping groove 3 is a detachable structure , and the two ends of the clamping slot 3 are respectively provided with a retracting side chuck 3a and a protruding side chuck 3b for stopping the roller; the retracting side chuck is arranged away from the side of the roll stand, and can be one with the drive shaft. As a whole, the extension side chuck is arranged close to the side of the roll stand and can be formed by two semi-circles. The number of rollers can be set to two, and the distance between the rollers is within the range of the slot on the transmission shaft, and does not affect the rotation and swing of the transmission shaft.

In this embodiment, the end of the drum teeth of the drive shaft 2 facing the roll stand 1 has a chamfer modification, and is provided with a guide section, so that the drive shaft can enter the corresponding roll in the roll stand; The tooth 2b and the inner gear sleeve 2a meshing with the outer tooth 2b are provided with a positioning block (not shown) corresponding to the tooth top or tooth root, so that the outer tooth and the inner gear sleeve can be installed.

Referring to Figures 2 and 3, the roller changing device in this embodiment also includes a frame replacement mechanism, which is mainly composed of a roller changing trolley 11, a transverse drive 12, and a longitudinal drive 13. The trolley 11 is used to place the roll stand 1, and is provided with two connected in series along the driving direction of the traverse drive 12, such as 11a and 11b, for receiving the roll stands to be replaced and pulled out from the rolling mill, respectively. Load a new roll stand; the traverse drive 12 uses a hydraulic cylinder to move the roll changing trolley 11; the longitudinal drive 13 also uses a hydraulic cylinder to push the roll stand 1. In this way, the roll stands are pushed in or pulled out of the rolling mill by the longitudinal drive to the roll changing trolley 11, and the roll changing trolley 11 is moved out of the rolling line by the traverse drive 12.

When changing the rollers, the drive shaft 2 is driven by the second drive 7 on the support member 10 to push the swing arm 8 to drive the support arm 9 to rise, and supports the drive shaft; then the first drive 5 drives the drive arm 4 to push the drive shaft 2 back. It is retracted and disengaged to separate it from the roll stand to be replaced; the stand replacement mechanism pulls out the roll stand to be replaced, pushes in a new roll stand, locks the new roll stand, and is pressed by the press The lower device is set at the roller changing position; then, the support arm is precisely positioned by controlling the position detection element on the second drive to support the transmission shaft; then the first drive causes the drive arm to extend and reset the transmission shaft, and is driven by the first drive. When the position detection element 6 on the first drive detects that the drum teeth of the transmission shaft are about to contact the corresponding rolls on the roll stand, the driving arm stops; then, the main motor (not marked) rotates at a slow speed to drive the transmission shaft Rotate so that the teeth of the drum teeth are aligned, and then the first drive causes the drive arm to continue to drive the drive shaft to extend and reset, so that the drive shaft engages with the new roll stand, and finally, the first drive and the second drive are released. , so that the drive arm and the support arm do not exert force on the drive shaft, so that the drive shaft and the new roll stand work normally.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

An automatic roll changing device for a continuous rolling mill, characterized in that it comprises a drive arm (4), a first drive (5), a second drive (7), and a swing arm (8) arranged on a support member (10). and a support arm (9), one end of the drive arm is connected with the first drive, and the other end of the drive arm acts on the drive shaft and is used to retract the drive shaft to disengage the roll stand (1) from the drive shaft (2) or Reset the drive shaft to engage the roll stand with the drive shaft; one end of the swing arm is connected to the second drive, and the other end of the swing arm is connected to one end of the support arm; the other end of the support arm acts on the drive shaft and is used for the roll The frame and the transmission shaft hold the transmission shaft when they are disengaged and engaged; a position detection element (6) is provided on the first drive and the second drive.
The automatic roll changing device for a continuous rolling mill according to claim 1, wherein the length of the swing arm is greater than the length of the support arm.
The automatic roll changing device of a continuous rolling mill according to claim 2, wherein the length of the swing arm is more than 1.5 times the length of the support arm.
The automatic roll changing device for a continuous rolling mill according to claim 1, wherein the hydraulic system of the first drive and the second drive is provided with a hydraulic lock and a proportional valve that are interlocked with the position detection element .
The automatic roll changing device for a continuous pipe mill according to claim 1, wherein the drive arm is provided with a roller acting on the transmission shaft, and the transmission shaft is provided with the roller along its axial direction. Matching slot (3).
The automatic roll changing device of a continuous rolling mill according to claim 5, wherein the two ends of the clamping groove are respectively provided with retracting side chucks (3a) and extending side chucks (3a) for stopping the rollers. 3b).
The automatic roll changing device for a continuous pipe mill according to claim 1, wherein the drum-shaped tooth end of the drive shaft facing the roll stand has a chamfered modification and is provided with a guide section; The outer teeth (2b) of the teeth and the inner gear sleeve (2a) meshing with the outer teeth are provided with positioning blocks corresponding to the positions of the tooth crests or the roots of the teeth.
The automatic roll changing device for a continuous pipe mill according to any one of claims 1 to 7, characterized in that it further comprises a frame changing mechanism, which is mainly composed of a roll changing trolley (11), a transverse drive (12), a longitudinal shift The drive (13) consists of a roll changing trolley for placing the roll stand, and two are connected in series along the driving direction of the traverse drive; the traverse drive is used to move the roll change trolley; the longitudinal drive is used for Push and pull roll stands.
Utilizing the roll changing method of the automatic roll changing device of a continuous rolling mill according to any one of claims 1-8, it is characterized in that, comprises the following steps:

1), the swing arm is driven by the second drive to drive the support arm to support the transmission shaft;

2), the drive arm is urged to retract and disengage the transmission shaft by the first drive;

3) The stand replacement mechanism pulls out the roll stand to be replaced that is disengaged from the drive shaft, and pushes it into a new roll stand;

4), the positioning control support arm supports the transmission shaft;

5), the drive arm is then driven by the first drive to extend and reset the drive shaft to engage with the new roll stand;

6), release the first drive and the second drive.
The method for changing rolls according to claim 9, wherein step 5) further comprises the following steps:

5.1) The drum teeth of the drive arm stopped at the drive shaft by the position detection element on the first drive are about to contact the corresponding roll on the roll stand;

5.2) Rotate the drive shaft to align the drum teeth;

5.3) Continue to extend the drive shaft by the drive arm to reset the engagement.