A high-precision position centering device

Abstract

The utility model relates to the technical field of steel pipe processing, and provides a high-precision position centering device for keeping the axis of a mandrel or a core rod coincident with the rolling center line, including a frame and a control system, and also including at least three centering mechanisms; the centering mechanism includes a positioning shaft, a swing arm, a pressure roller and a drive assembly, the positioning shaft is mounted on the frame, the swing arm is rotatably connected with the positioning shaft, the pressure roller is mounted on the swing arm, and the drive assembly is used to drive the swing arm to rotate around the positioning shaft so that the pressure roller moves to a circle with the rolling center line as the center. Each centering mechanism in the device acts independently, and the control system generates a preset circle based on the rolling center line. The control system starts the hydraulic cylinder in the centering mechanism through program control, and under the action of the swing arm and the positioning shaft, the pressure roller will move to the circumference of the preset circle, so that the mandrel or the core rod can accurately reach and remain in the required position, thereby ensuring the quality of the rolled steel pipe product.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe processing, in particular to a high-precision position centering device. Background Art

[0002] The two main deformation units in the production of hot-rolled steel pipes are the piercing unit and the precision stretching cross-rolling unit (hereinafter referred to as the tube rolling unit). During the entire rolling process, the piercing unit's top head (assembled at the front end of the top rod) and the mandrel of the tube rolling unit are the two most important deformation tools besides the main machine rolls, guide discs and guide plates. The top head and the mandrel, together with the rolls in the piercing unit and the rolls in the tube rolling unit, respectively, form the rolling pass to complete the steel pipe rolling.

[0003] In order to obtain steel pipes with certain quality standards (diameter, wall thickness, shape tolerance, internal and external surface conditions, etc.), the center of the circle surrounded by two or three rollers is used as the rolling center of the unit. In terms of the oblique rolling process requirements, it is necessary to keep the axis of the mandrel or mandrel coincident with the axis of the rolling center (hereinafter referred to as the rolling center line), and by constraining the surface of the mandrel or mandrel, the radial runout is minimized, that is, the position of the mandrel or mandrel is kept stable.

[0004] Since it is necessary to roll out a finished steel pipe of a certain length, the corresponding rough pipe and rough pipe in the front process of the finished steel pipe also have a long length. The general rough pipe length is about 10 meters, and the rough pipe length is about 18 meters. In addition, the corresponding equipment used to move and support the tail end of the mandrel and the tail end of the mandrel, the length of the mandrel and the mandrel are greater than the corresponding length of the rough pipe and rough pipe. The ratio of the length to the diameter of the rough pipe and the rough pipe is about 25. During operation, the mandrel is compressed at both ends of the axial direction, and at the same time, it is passively rotated at a speed much higher than the roller speed through the high pressure contact between the blank and the mandrel by the roller around the axis. At this time, the mandrel will produce bending deformation and radial shaking similar to the instability of the pressure rod; the mandrel is pulled at both ends of the axial direction, and at the same time, it is passively rotated at a speed much higher than the roller speed through the high pressure contact between the rough pipe and the mandrel working section by the roller around the axis. At this time, the mandrel will produce bending vibration similar to a slender shaft.

[0005] As a result, the position of the mandrel and the core rod will change along the diameter direction during operation, which is manifested as the mandrel shaking in the direction perpendicular to the rolling center line; the core rod swinging in the direction perpendicular to the rolling center line. This position change will cause the position of the mandrel or the core rod working section to deviate in the rolling hole formed by the roller, directly causing adverse consequences such as uneven wall thickness, large overall curvature of the tube body, and surface quality defects in the tube body in the rough tube and the rough tube. The degree to which the axis of the mandrel and the core rod deviates from the preset rolling center line during operation (the mandrel is compressed and bent, and the core rod is pulled and swung) (mandrel or core rod rotates around its own axis while also performing a jumping rotation around the preset rolling center line with a certain eccentricity) is usually summarized as the rolling stability of the mandrel or core rod during rolling. The greater the deviation, the worse its stability, and the greater the impact on the quality of the rough tube punched out and the rough tube rolled out. And suppressing and reducing the position change of the mandrel and the mandrel, that is, improving the rolling stability of the mandrel and the mandrel, is one of the key factors to obtain the predetermined and high-quality product quality.

[0006] At the same time, since the punched rough tube is sleeved on the outer diameter of the mandrel during the entire perforation and rolling process, and the mandrel is inserted into the rough tube during the elongation and rolling process, the entire centering equipment needs to make the circle formed by the roller satisfy the constraint of the relatively small diameter mandrel or mandrel. At the same time, the circle formed by the roller must be slightly larger than the diameter of the rough tube to guide the rough tube.

[0007] In order to keep the position of the ejector or mandrel stable, a centering device is generally used. Existing centering devices mainly include two categories: one is that three (or more) rockers are connected to each other by rods through hinges, and one of the rockers is driven by a hydraulic cylinder acting as a moving slider, and the other rockers are driven by the rods to realize the linkage of three rollers, and the three rollers form a constraint circle; the other is three groups (or more) of four-bar linkages, each group is connected by a connecting rod through a hinge, and finally connected to a linkage member working in a rocker manner, and the linkage member is driven by a hydraulic cylinder acting as a moving slider to realize the linkage of three or more rollers.

[0008] In this centering device, the connection between each rocker and the rod is carried out through the hinge point. The movement (usually swinging) of three or more rollers is driven by the same hydraulic cylinder. The rod acts as a linkage to realize the linkage of three or four rollers, and the synchronous movement of each roller is realized by the same size of each group of rods and rockers. The main function of the hydraulic cylinder is to maintain the position of the roller under various stress conditions, and to provide position detection and control through the mechanical structure limit or the displacement sensor built into the cylinder. The force acting on each roller is transmitted to the driving hydraulic cylinder through the hinge point.

[0009] This centering device essentially uses rods or connecting rods to place the rollers on the same circumference, and the actual position of the center of this circle is driven by a hydraulic cylinder to make the center coincide with the required center (i.e. the axis of the push rod or core rod). However, due to the following factors, there is always a certain amount of deviation between the center of the circle formed by the separate placement of the rollers and the required center.

[0010] Since the rockers of each roller are connected at the hinge point through a rod or connecting rod, the hinge point structure generally adopts a pin and a sleeve to match the connection, and a certain amount of clearance must be maintained between the pin and the sleeve. The hinge point is a force transmission point, and there is also mutual rotation. Therefore, in actual use, wear at the hinge point is inevitable, and the amount of wear will increase with the use time, which is directly manifested as an increase in the clearance value at the hinge point. As the clearance at the hinge point increases, in addition to the rocker directly connected to the hydraulic cylinder, the actual position change of the other two (or more) rollers assembled on the rocker will also increase.

[0011] The gap at the connecting hinge of each rod in the centering device due to wear directly affects the degree of restraint of the radial runout of the mandrel and the mandrel by the centering device. Even if the hydraulic cylinder is in the accurate positioning position, the actual position of each roller in the same centering device is not fixed, and the axis of the circle formed by the three rollers (or multiple rollers) deviates from the predetermined rolling center line. As a result, the radial swing (shake) of the mandrel or mandrel at this location increases, resulting in a decrease in the stabilizing effect of the centering device on the mandrel or mandrel, which in turn affects the quality of the rolled steel pipe product.

[0012] For the centering equipment which adopts three (or more) groups of four-bar mechanisms to work synchronously through linkage parts, since the four-bar mechanism has the characteristics that it can only achieve precise reaching of a few points and can only approximately reach other points, and a centering equipment needs to meet the precise positioning of mandrels or core rods of different diameters (referring to the diameter of the circle formed by the three rollers completely coincides with the diameter of the mandrel or core rod to be positioned), therefore, within the positioning working range designed for the centering equipment, only precise positioning constraints can be achieved for a few selected mandrels or core rods.

[0013] In actual use, due to relevant structural and layout reasons, usually about 5 three-roller centering devices are set behind the main machine of the punching unit, and these 5 devices together determine the position of the mandrel, that is, after the 5 devices constrain the mandrel, the axis of the mandrel is located on the predetermined rolling center line. During the punching process, the circle formed by each three-roller limits the radial runout of the mandrel (that is, the jitter in the direction perpendicular to the rolling center line mentioned above), and keeps the head of the front end of the mandrel in the correct position in the rolling hole of the punching unit; 3-4 centering devices are set at the front desk of the pipe rolling unit. During rolling, each centering device limits the swing of the mandrel (perpendicular to the rolling center line) to keep the mandrel in the correct position in the rolling hole of the pipe rolling unit. The coaxial error between multiple centering devices (referring to the coaxiality between the axis lines of the circle formed by the rollers of each centering device) and the error between the axis line of the circle formed by each roller in a single centering device and the preset rolling center line determine the correct position of the axis line of the push rod or mandrel during rolling.

[0014] When multiple centering devices are used together to stabilize the mandrel or core rod, whether it is the deviation of the positions of different groups of rollers on the same frame caused by the characteristics of the four-bar linkage, or the coaxiality error between multiple centering devices, it will cause the axis of the circle formed by three rollers (or more rollers) in one centering device to not coincide with the preset rolling center line, thereby aggravating the radial runout of the mandrel or core rod by the centering device, and even if the position-maintaining effect of the mandrel or core rod by the centering device is reduced, the deviation of the actual position of the working section of the mandrel or core rod in the hole formed by the rollers will be aggravated, thereby reducing the quality of the rolled steel pipe. Utility Model Content

[0015] In view of the defects in the prior art, the purpose of the utility model is to provide a high-precision position centering device, which can avoid the defects of the current centering device such that the actual position of the roller is not fixed due to the increase of the gap caused by the wear of the pin shaft or sleeve at the hinge point; the structural characteristics of the four-bar mechanism itself cannot achieve accurate arrival of all points; after the installation of multiple-frame centering equipment, the axis of each frame does not coincide with the rolling center line, causing the actual position of the push rod or mandrel to change during operation, which reduces the rolling stability of the push rod or mandrel and leads to a decrease in the quality of the rough pipe or rough pipe.

[0016] In order to achieve the above-mentioned object, the utility model is implemented by the following technical solutions: a high-precision position centering device for keeping the axis of the mandrel or mandrel coincident with the rolling center line, including a frame and a control system, and also including at least three centering mechanisms;

[0017] The centering mechanism includes a positioning shaft, a swing arm, a pressure roller and a drive assembly. The positioning shaft is installed on a frame, the swing arm is rotatably connected to the positioning shaft, the pressure roller is installed on the swing arm, and the drive assembly is used to drive the swing arm to rotate around the positioning shaft so that the pressure roller moves to a circle with the rolling centerline as the center.

[0018] Furthermore, the number of the centering mechanisms is three, one of which is arranged above the rolling center line, and the other two centering mechanisms are arranged below the rolling center line.

[0019] Further, the driving assembly located above the rolling center line includes a first hydraulic cylinder and a first displacement sensor, the piston rod of the first hydraulic cylinder is hinged to the swing arm, the cylinder body of the first hydraulic cylinder is hinged to the frame, the first displacement sensor is installed on the hydraulic cylinder and is electrically connected to the control system, and the first displacement sensor is used to measure the stroke of the hydraulic cylinder;

[0020] The driving assembly located below the rolling center line includes a second hydraulic cylinder, a worm gear screw lift and a second displacement sensor, the piston rod of the second hydraulic cylinder is hinged to the swing arm, the cylinder body of the second hydraulic cylinder is fixedly connected to the top head of the worm gear screw lift, the housing of the worm gear screw lift is hinged to the frame, the second displacement sensor is installed on the worm gear screw lift and is electrically connected to the control system, and the second displacement sensor is used to measure the overall stroke of the worm gear screw lift and the hydraulic cylinder.

[0021] Furthermore, the accuracy of the first displacement sensor and the second displacement sensor are both 0.5 micrometers.

[0022] Furthermore, all of the centering mechanisms are arranged at equal intervals along the circumferential direction of the rolling center line.

[0023] Beneficial effects of the utility model: the utility model provides a high-precision position centering device, each centering mechanism is independently operated. The staff inputs the actual size data of the mandrel or mandrel into the control system in advance, and the control system generates a preset circle based on the rolling center line. Then the control system starts the hydraulic cylinder in the centering mechanism through program control. Under the action of the swing arm and the positioning shaft, the pressure roller will move to the circumference of the preset circle, so that the mandrel or mandrel can accurately reach and remain in the required position, thereby ensuring the quality of the rolled steel pipe product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view structural schematic diagram of the utility model;

[0025] Figure 2It is a schematic diagram of the top view structure of the utility model;

[0026] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0028] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure along the CC direction;

[0029] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure along the DD direction.

[0030] Figure numerals: 10 - mandrel or core rod, 11 - rolling center line, 20 - frame, 30 - centering mechanism, 31 - positioning shaft, 32 - swing arm, 33 - pressure roller, 40 - first hydraulic cylinder, 41 - first displacement sensor, 50 - second hydraulic cylinder, 51 - worm gear screw lift, 52 - mandrel, 53 - second displacement sensor. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] In this application, unless otherwise clearly specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "up", "down", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0035] The applicant has conducted in-depth research on the formation and control process of quality defects of oblique rolled steel pipes, and combined with the actual production experience accumulated on the actual production of the tube rolling mill, analyzed the structure and use of the equipment for stably centering the mandrel or mandrel in the current hot rolled steel pipe tube rolling mill, and proposed a high-precision position centering device for high-precision positioning and precise position maintenance of the mandrel in the perforating unit or the mandrel in the tube rolling unit.

[0036] like Figure 1-Figure 6 As shown, the utility model provides a high-precision position centering device for keeping the axis of a mandrel or a core rod 10 coincident with a rolling center line 11 , comprising a frame 20 and a control system, and also comprising at least three centering mechanisms 30 .

[0037] The centering mechanism 30 includes a positioning shaft 31, a swing arm 32, a pressure roller 33 and a driving assembly. The positioning shaft 31 is installed on the frame 20 in the transverse direction. The swing arm 32 is an arc-shaped structure, and the middle part of the swing arm 32 is rotatably connected to the positioning shaft 31. The pressure roller 33 is installed at the first end of the swing arm 32. The driving assembly is used to drive the second end of the swing arm 32 to rotate around the positioning shaft 31 so that the pressure roller 33 moves to a circle with the rolling center line as the center.

[0038] In this device, each centering mechanism 30 operates independently and does not affect each other. The staff uses the rolling center line 11 as the center and the radius of the mandrel or mandrel 10 as the radius to draw a preset circle. Then, according to the size of the preset circle, the drive assembly controls the pressure roller 33 to move to the circumference of the preset circle. Since at least three centering mechanisms 30 cooperate, the mandrel or mandrel 10 can accurately reach and remain in the required position, thereby ensuring the quality of the rolled steel pipe product.

[0039] It is worth noting that the working principle of this device is completely different from that of the existing centering device. The existing centering device is driven by the same driving assembly, and the connecting rod mechanism acts as a linkage to realize the linkage of three or four rollers, and synchronously sleeves three or four pressure rollers 33 on the outer circumference of the mandrel or core rod 10, so as to keep the mandrel or core rod 10 in this position. However, due to the defects of the mechanical structure and the mutual influence between the connecting rod mechanisms, this design cannot make the axis of the mandrel or core rod 10 accurately coincide with the rolling center line 11, and there is a large error.

[0040] In this device, the staff uses the rolling center line 11 as the center and the radius of the mandrel or core rod 10 as the radius to delineate a preset circle, and the drive assembly controls the pressure roller 33 to move and remain on the circumference of the preset circle. Since each centering mechanism 30 acts independently and does not affect each other, the initial state of each centering mechanism 30 can be different, the start-up time can be different, and the size of each component can be different, as long as the pressure roller 33 can move and remain on the circumference of the preset circle. Compared with the prior art, this device has better accuracy.

[0041] In one embodiment, the number of the centering mechanisms is three, one of which acts above the rolling center line, and the other two centering mechanisms act below the rolling center line.

[0042] In one embodiment, the driving assembly acting on the rolling center line includes a first hydraulic cylinder 40 and a first displacement sensor 41. The piston rod of the first hydraulic cylinder 40 is hinged to the swing arm, and the cylinder body of the first hydraulic cylinder 40 is hinged to the frame 20. The first displacement sensor 41 is installed on the first hydraulic cylinder 40 and is electrically connected to the control system. The first displacement sensor 41 is used to measure the stroke of the first hydraulic cylinder 40.

[0043] The driving assembly acting below the rolling center line 11 includes a second hydraulic cylinder 50, a worm gear screw lift 51, and a second displacement sensor 52. The piston rod of the second hydraulic cylinder 50 is hinged to the swing arm 32, the cylinder body of the second hydraulic cylinder 50 is fixedly connected to the top of the worm gear screw lift 51, the housing of the worm gear screw lift 51 is hinged to the frame 20, and a series structure is formed between the worm gear screw lift 51 and the second hydraulic cylinder 50. The second displacement sensor 53 is installed on the worm gear screw lift 51 and is electrically connected to the control system. The second displacement sensor 53 is used to measure the overall stroke of the worm gear screw lift 51 and the second hydraulic cylinder 50. Specifically, the sensing rod of the second displacement sensor 53 passes through the top of the worm gear screw lift 51 and is fixedly connected to the piston rod of the second hydraulic cylinder 50. In this way, no matter whether the worm gear screw lift 51 or the second hydraulic cylinder 50 is in motion, the second displacement sensor 53 can measure the overall stroke of the worm gear screw lift 51 and the second hydraulic cylinder 50.

[0044] This design allows the first hydraulic cylinder 40 and the second hydraulic cylinder 50 to be installed in the frame 20, so that the external force applied to the device is converted into the internal force of the frame 20, thereby increasing the rigidity of the device.

[0045] This design makes the device a frame-type closed force-bearing structure, so that the force exerted by the top rod or core rod 10 on the pressure roller 33 is converted into the internal force of the frame 20, which greatly improves the body force rigidity of the frame 20 (that is, the deformation of the frame 20 after being subjected to force is smaller).

[0046] The design of the worm screw lift 51 can improve the supporting effect of the device on the push rod or core rod 10 and better bear the gravity of the push rod or core rod 10.

[0047] When the device is in working state, the worm screw lift 51 does not move, and the control system controls the second hydraulic cylinder 50 to move.

[0048] When the device is in the adjustment state, the second hydraulic cylinder 50 does not move, and the control system controls the worm screw lift 51 to move, thereby achieving a large adjustment of the corresponding swing arm 32 and the pressure roller 33, so that the device quickly enters the working state.

[0049] The working process of the equipment is as follows: the staff inputs the actual size data of the mandrel or mandrel 10 into the control system in advance, and the control system generates a preset circle with the rolling center line 11 as the center and the radius of the mandrel or mandrel 10 as the radius. Then the control system starts the first hydraulic cylinder 40 and the second hydraulic cylinder 50 through program control. Under the action of the swing arm 32 and the positioning shaft 31, the pressure roller 33 will move to the circumference of the preset circle. At this time, the first displacement sensor 41 or the second displacement sensor 53 respectively detects that the first hydraulic cylinder 40 and the second hydraulic cylinder 550 have reached the maximum stroke, and then sends a signal to the control system. The control system controls the first hydraulic cylinder 40 and the second hydraulic cylinder 50 to close, so that the mandrel or mandrel 10 can accurately reach and remain in the required position, thereby ensuring the quality of the rolled steel pipe product. The entire process is controlled by the program, which further improves the accuracy of the equipment.

[0050] In one embodiment, the accuracy of the first displacement sensor 41 and the second displacement sensor 53 are both 0.5 micrometers.

[0051] In one embodiment, all the centering mechanisms 30 are arranged at equal intervals along the circumference of the rolling center line 11. Preferably, the distances between all the positioning shafts 31 and the rolling center line 11 are equal.

[0052] In the present device, the swing radius of all the swing arms 32 is the same.

[0053] Among them, the pressure roller 33 acting on the rolling center line 11, when stabilizing the push rod or core rod 10, the first hydraulic cylinder 40 reaches the maximum stroke and drives the pressure roller 33 to move to the circumference of the preset circle, so as to directly contact the upper part of the push rod or core rod 10, and the first hydraulic cylinder 40 controls the hydraulic lock in the valve station to maintain the position.

[0054] The action of the pressure roller 33 acting below the rolling center line 11 is controlled by the second hydraulic cylinder 50 and the worm screw lift 51. The second displacement sensor 53 installed on the worm screw lift 51 provides displacement detection. The control system controls the telescopic length of the top of the worm screw lift 51 and determines the precise position of the pressure roller 33. When the mandrel or mandrel 10 is stabilized, the second hydraulic cylinder 50 reaches the maximum stroke to drive the pressure roller 33 to move to the circumference of the preset circle, so as to directly contact the upper part of the mandrel or mandrel 10, and the second hydraulic cylinder 50 controls the hydraulic lock in the valve station to maintain the position. Since the pressure roller 33 of each centering mechanism 30 is moved to the circumference of the preset circle to keep stable, the device can make the axis of the mandrel or mandrel 10 coaxial with the rolling center line 11 to achieve precise centering.

[0055] When the first hydraulic cylinder 40 and the second hydraulic cylinder 50 are both in the full-stroke retracted state, the entire device is in the discharging state.

[0056] In the present invention, each centering mechanism 30 acts independently without affecting each other. Through program control and high-precision displacement sensor detection, as well as the load-bearing of a mechanical structure without rod connections, it is achieved that during the entire rolling process, the pressure rollers 33 in all centering mechanisms 30 can be accurately moved to the circumference of a preset circle, thereby stabilizing the push rod or mandrel 10, so that the centered push rod or mandrel 10 can accurately reach and remain in the required position, thereby ensuring that the quality of the rough pipe produced by perforation rolling and the rough pipe produced by extension rolling will not decrease due to changes in the position of the push rod or mandrel 10.

[0057] The beneficial effects of the utility model are as follows: since the swing arms 32 for installing the various rollers 33 are not mechanically connected to each other, the rollers 33 can achieve a position accuracy of less than 0.01 mm when bearing the reaction force of the mandrel or core rod 10 by means of displacement sensor detection, control system program control and hydraulic lock control. Therefore, the position accuracy of the rollers 33 that actually constrain the mandrel or core rod 10 is high, and the first hydraulic cylinder 40 and the second hydraulic cylinder 50 do not directly bear the force during operation, and there is no problem of a significant decrease in the position accuracy of the rollers 33 caused by increased mechanical wear clearance. A more uniform rough tube wall thickness and overall straightness of the rough tube can be obtained, and the core rod can be kept in the correct position and the jumping of the core rod can be suppressed, so that the wall thickness of the finished steel pipe can be uniform, the inner spiral path can be reduced, and a higher quality inner surface finished steel pipe can be obtained.

[0058] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-precision position centering device for keeping the axis of the mandrel or mandrel coincident with the rolling center line, comprising a frame and a control system, characterized in that: It also includes at least three centering mechanisms; The centering mechanism includes a positioning shaft, a swing arm, a pressure roller and a drive assembly. The positioning shaft is installed on a frame, the swing arm is rotatably connected to the positioning shaft, the pressure roller is installed on the swing arm, and the drive assembly is used to drive the swing arm to rotate around the positioning shaft so that the pressure roller moves to a circle with the rolling centerline as the center.

2. A high-precision position centering device according to claim 1, characterized in that: The number of the centering mechanisms is three, one of which acts above the rolling center line, and the other two centering mechanisms act below the rolling center line.

3. A high-precision position centering device according to claim 2, characterized in that: The driving assembly located above the rolling center line includes a first hydraulic cylinder and a first displacement sensor, the piston rod of the first hydraulic cylinder is hinged to the swing arm, the cylinder body of the first hydraulic cylinder is hinged to the frame, the first displacement sensor is installed on the hydraulic cylinder and is electrically connected to the control system, and the first displacement sensor is used to measure the stroke of the hydraulic cylinder; The driving assembly located below the rolling center line includes a second hydraulic cylinder, a worm gear screw lift and a second displacement sensor, the piston rod of the second hydraulic cylinder is hinged to the swing arm, the cylinder body of the second hydraulic cylinder is fixedly connected to the top head of the worm gear screw lift, the housing of the worm gear screw lift is hinged to the frame, the second displacement sensor is installed on the worm gear screw lift and is electrically connected to the control system, and the second displacement sensor is used to measure the overall stroke of the worm gear screw lift and the hydraulic cylinder.

4. A high-precision position centering device according to claim 3, characterized in that: The precision of the first displacement sensor and the second displacement sensor are both 0.5 micrometers.

5. The high-precision position centering device according to claim 1, characterized in that: All the centering mechanisms are arranged at equal intervals along the circumferential direction of the rolling center line.

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