High-precision positioning three-roller centering device and positioning adjustment method thereof

Abstract

The present invention discloses a high-precision positioning three-roller centering device and a positioning adjustment method thereof, which solves the problem of low positioning accuracy existing in existing equipment. The traditional structure of synchronously driving three rollers through a connecting rod mechanism on the punching machine is changed, and each centering roller is connected to the piston of its own independent servo cylinder. The three independent servo cylinders are connected to the same hydraulic system. By controlling the hydraulic oil of the hydraulic system, the synchronous extension and retraction of the pistons of the three independent servo cylinders are realized. The positioning accuracy of the present invention can reach the micron level, ensuring that the push rod and the rolling center line are completely coincident; a hydraulic motor is connected to the other end of the independent servo cylinder piston, and the rotation of the piston is realized by controlling the hydraulic motor. Through the respective hydraulic motors connected to the respective servo cylinders, the respective angles of the three rollers are adjusted separately, thereby realizing the change of the angle between the centering roller and the rolling line. The present invention has a simple structure, and the servo cylinder improves the positioning accuracy of the centering roller.

Description

Technical Field

[0001] The invention relates to seamless steel pipe production equipment, in particular to a high-precision positioning three-roller centering device and a positioning adjustment method thereof. Background Art

[0002] When the seamless steel pipe piercing unit is used to pierce and roll steel pipes, the main rolling tools used are deformation tools such as rollers, mandrels, and guide plates. The two rollers are arranged up and down or left and right to form a feeding angle and rolling angle for the tube blank in space. The guide plates are arranged left and right or up and down. The two guide plates and the two rollers form a closed rolling hole. The mandrel is installed on the head of the mandrel. The mandrel is connected to the pierced solid tube blank through the mandrel. The solid tube blank is rolled and rotated under the rolling of the two rollers. The rough tube formed by rolling is sleeved on the mandrel. In the tube-piercing rolling, it is necessary to ensure that the push rod and the push head are in the center of the annular rolling space formed by the two rollers and the two guide plates, that is, on the rolling center line. In order to achieve this purpose, the prior art is to arrange a number of three-roller centering devices at equal intervals on the frame, and the three centering rollers of the three-roller centering device synchronously clamp the push rod to ensure that the push rod is always on the rolling center line during the piercing rolling. The structure of the traditional three-roller centering device is: three centering rollers are arranged on the same centering device chassis, The three centering rollers are arranged at an arc of 120 degrees in space. The three centering rollers are connected by a connecting rod mechanism to achieve synchronous clamping of the push rod, or synchronous opening and moving away from the push rod. The synchronous action and installation accuracy of the connecting rod mechanism directly determine the accurate positioning of the push rod on the rolling center line. The existing three-roller centering device has the following problems: (1) The copper sleeves or spherical bearings are used in the joints of the connecting rod mechanism, which have the defect of short service life and need to be replaced frequently during operation; the connecting rod mechanism has mechanical installation matching errors and cannot ensure the high-precision positioning of the three rollers. During operation, new position deviations will appear; (2) When the three rollers clamp the push rod, the centering rollers and the push rod are in line contact, resulting in poor centering stability; (3) When the push rod and the rough tube retreat, the three centering rollers cannot provide a retreat conveying track for the push rod and the rough tube. The existing technology is to set up a retreat conveying roller separately on the rolling line to complete its retreat, resulting in complex equipment structure and high equipment investment cost. Summary of the invention

[0003] The invention provides a high-precision positioning three-roller centering device and a positioning adjustment method thereof, which solves the technical problems of low positioning accuracy and inability of positioning rollers to provide a retracting conveying track for retracting wool pipes in existing equipment.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The overall concept of the present invention is as follows: the traditional structure of synchronously driving three rollers through a connecting rod mechanism on the punching machine is changed, and each centering roller is connected to the piston of its own independent servo cylinder. The three rollers are arranged at an arc interval of 120° in space. The three independent servo cylinders are connected to the same hydraulic system. By controlling the hydraulic oil of the hydraulic system, the synchronous extension and retraction of the pistons of the three independent servo cylinders are achieved. The positioning accuracy of the present invention can reach micron level, which ensures that the push rod is completely coincident with the rolling center line, avoids mechanical wear, and increases the service life of the centering roller; a hydraulic motor is connected to the other end of the piston of the independent servo cylinder, and the rotation of the piston is achieved by controlling the hydraulic motor. The pistons are connected to the respective servo cylinders. The respective hydraulic motors realize the individual adjustment of the angles of the three rollers, thereby realizing the change of the angle between the centering roller and the rolling line; when the push rod retracts the rough tube with the rough tube, the centering roller is rotated to a state perpendicular to the push rod, so that the centering roller can be used as a conveying roller, and there is no need to set up a retracting conveying roller in the equipment, thereby realizing the operation of retracting the rough tube by using the centering roller; in addition, the present invention also arranges the roller surface of the centering roller into an inwardly concave curved surface, and in the process of clamping the push rod or guiding the rough tube, the centering roller and the push rod form an envelope contact in the circumferential direction, so that the stability of the rough tube in the rotation and advancement is greatly enhanced, the quality of the perforated rough tube is improved, and the wall thickness deviation of the rough tube rolling is reduced.

[0006] A high-precision positioning three-roller centering device comprises a hydraulic system and a frame bottom plate, a rear vertical plate and a front vertical plate are fixedly arranged on the frame bottom plate in parallel with each other, a rear vertical plate U-shaped groove is arranged on the top of the rear vertical plate, and a front vertical plate U-shaped groove is arranged on the top of the front vertical plate, the rear vertical plate U-shaped groove and the front vertical plate U-shaped groove are arranged correspondingly, a bottom servo cylinder mounting plate, a left servo cylinder mounting plate and a right servo cylinder mounting plate are fixedly arranged between the rear vertical plate and the front vertical plate, a bottom servo cylinder through-hole is arranged on the frame bottom plate, the mid-point perpendicular line of the bottom servo cylinder mounting plate, the mid-point perpendicular line of the left servo cylinder mounting plate and the mid-point perpendicular line of the right servo cylinder mounting plate form an angle of 120 degrees with each other in space, a bottom servo cylinder is arranged on the bottom servo cylinder mounting plate, a left servo cylinder is arranged on the left servo cylinder mounting plate, and a right servo cylinder is arranged on the right servo cylinder mounting plate, and a bottom centering rod is connected to the inner side protruding rod connected to the piston of the bottom servo cylinder The center roller is connected to a left centering roller on the inner extending rod connected to the piston of the left servo cylinder, and a right centering roller is connected to the inner extending rod connected to the piston of the right servo cylinder. A push rod is arranged between the bottom centering roller, the left centering roller and the right centering roller, and a capillary tube is arranged on the push rod. The lower end of the bottom servo cylinder passes through the through hole of the bottom servo cylinder and is arranged below the bottom plate of the frame; a bottom turbine reducer is connected to the outer extending rod connected to the piston of the bottom servo cylinder, and a bottom hydraulic motor is connected to the bottom turbine reducer, a left turbine reducer is connected to the outer extending rod connected to the piston of the left servo cylinder, and a left hydraulic motor is connected to the left turbine reducer, and a right turbine reducer is connected to the outer extending rod connected to the piston of the right servo cylinder, and a right turbine reducer is connected to the right hydraulic motor; the bottom servo cylinder, the left servo cylinder and the right servo cylinder are all connected to the hydraulic system.

[0007] Splines are provided at the outer end of the outer extension rod connected to the piston of the bottom servo cylinder, the outer end of the outer extension rod connected to the piston of the left servo cylinder, and the outer end of the outer extension rod connected to the piston of the right servo cylinder. Hollow output shafts are provided on the bottom turbine reducer, the left turbine reducer, and the right turbine reducer. The outer end of the outer extension rod connected to the piston is mechanically connected to the hollow output shaft through splines. The roller surface of the bottom centering roller, the roller surface of the left centering roller, and the roller surface of the right centering roller are all inwardly concave curved surfaces.

[0008] A position sensor probe insertion hole is arranged on the outer extension rod, a position sensor is connected to the outer end of the outer extension rod, a sensor probe of the position sensor is arranged in the position sensor probe insertion hole, and the position sensor is electrically connected to the hydraulic system.

[0009] A positioning and adjustment method for a three-roller centering device with high-precision positioning, characterized by the following steps:

[0010] The first step is to determine the feed angle and rolling angle formed between the bottom centering roller, the left centering roller and the right centering roller and the rough tube according to the outer diameter of the rough tube being rolled, and rotate the pistons in the three centering rollers through the bottom hydraulic motor, the left hydraulic motor and the right hydraulic motor respectively, so that the centering roller and the push rod form an envelope contact on the circumference during the rough tube rolling process;

[0011] The second step is to inject hydraulic oil into the three servo cylinders through the hydraulic system. The pistons in the servo cylinders drive the three centering rollers to clamp the ejector rod synchronously, thus completing the stable positioning of the ejector rod during perforation.

[0012] Step 3: When the rolled rough pipe rotates along the top rod to the clamping position of the three centering rollers, the hydraulic system controls the three centering rollers to rise outwards a certain distance synchronously, so that the rough pipe passes through and forms a limit for the rough pipe;

[0013] Step 4. After the rough pipe is rolled, the central axis of the bottom centering roller, the central axis of the left centering roller and the central axis of the right centering roller are adjusted to a position perpendicular to the central axis of the push rod through the bottom hydraulic motor, the left hydraulic motor and the right hydraulic motor respectively, so that the bottom centering roller, the left centering roller and the right centering roller form a return conveying roller for the push rod and the rough pipe.

[0014] The invention has a simple structure and eliminates the synchronous connecting rod mechanism of the three rollers. The servo cylinder improves the positioning accuracy of the centering roller. Since the angles of the three rollers are adjustable and an arc-shaped roller surface with an envelope line is adopted, in the process of holding the top rod and the rough pipe, the envelope contact with the top rod and the rough pipe is achieved through real-time angle adjustment, thereby improving the stability of the top rod. At the same time, in the process of the rough pipe passing through, since the diameter of the rough pipe is larger than the diameter of the top rod, the roller angle can be changed in real time to make the formed annular space better constrain the rough pipe, thereby improving the stability of the rough pipe rotating forward; due to the use of servo cylinder drive, the size of the pipe-threading annular space can be adjusted in real time, before the arrival of the pipe head, the setting value of the annular space is enlarged, and after the pipe head passes through, the annular space is reduced under the control of the servo cylinder, thereby improving the guiding stability of the rough pipe, thereby improving the uniformity of the wall thickness of the rough pipe; at the same time, for the lower roller among the three rollers, the function of one roller with multiple uses can be realized, and it is used to stabilize the top rod and the rough pipe during the rolling process, and in the process of the top rod retreating after throwing the steel, it is used to support the conveying roller through the rotation angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the frame of the three-roller centering device of the present invention;

[0017] Figure 3It is a schematic diagram of the structure of the three centering rollers of the present invention connected to the top rod 16;

[0018] Figure 4 It is a schematic diagram of the structure of three centering rollers of the present invention being connected to the rough tube 26;

[0019] Figure 5 It is a schematic structural diagram of the three centering rollers of the present invention and the rough tube 26 connected to form an envelope;

[0020] Figure 6 It is a diagram showing the matching relationship between the hydraulic cylinder body of the present invention and the hollow output shaft 29 of the turbine reducer;

[0021] Figure 7 It is a schematic diagram of the structure when the centering rollers form the return conveying rollers of the top rod 16 and the rough tube 26. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings:

[0023] A high-precision positioning three-roller centering device comprises a hydraulic system and a frame bottom plate 1. A rear vertical plate 2 and a front vertical plate 4 are fixedly arranged on the frame bottom plate 1 in parallel with each other. A rear vertical plate U-shaped groove 3 is arranged at the top of the rear vertical plate 2. A front vertical plate U-shaped groove 5 is arranged at the top of the front vertical plate 4. The rear vertical plate U-shaped groove 3 and the front vertical plate U-shaped groove 5 are arranged correspondingly. A bottom servo cylinder mounting plate 7, a left servo cylinder mounting plate 8 and a right servo cylinder mounting plate 9 are fixedly arranged between the rear vertical plate 2 and the front vertical plate 4, respectively. A bottom servo cylinder through-hole is arranged on the frame bottom plate 1. 6. The midline of the bottom servo cylinder mounting plate 7, the midline of the left servo cylinder mounting plate 8 and the midline of the right servo cylinder mounting plate 9 are at an angle of 120 degrees to each other in space. A bottom servo cylinder 10 is arranged on the bottom servo cylinder mounting plate 7, a left servo cylinder 11 is arranged on the left servo cylinder mounting plate 8, and a right servo cylinder 12 is arranged on the right servo cylinder mounting plate 9. A bottom centering roller 13 is connected to the inner side extending rod connected to the piston of the bottom servo cylinder 10, and a bottom centering roller 13 is connected to the inner side extending rod connected to the piston of the left servo cylinder 11. The left centering roller 14 is connected to the right centering roller 15 on the inner extension rod connected to the piston of the right servo cylinder 12. A push rod 16 is arranged between the bottom centering roller 13, the left centering roller 14 and the right centering roller 15. The push rod 16 passes through the U-shaped groove 3 of the rear vertical plate and the U-shaped groove 5 of the front vertical plate in sequence. A capillary tube 26 is arranged on the push rod 16. The lower end of the bottom servo cylinder 10 passes through the through hole 6 of the bottom servo cylinder and is arranged below the bottom plate 1 of the frame; the bottom turbine is connected to the outer extension rod connected to the piston of the bottom servo cylinder 10. The reducer 18 is connected to the bottom hydraulic motor 17 on the bottom turbine reducer 18, the left turbine reducer 21 is connected to the outer extending rod connected to the piston of the left servo cylinder 11, the left hydraulic motor 20 is connected to the left turbine reducer 21, the right turbine reducer 24 is connected to the outer extending rod connected to the piston of the right servo cylinder 12, and the right hydraulic motor 23 is connected to the right turbine reducer 24; the bottom servo cylinder 10, the left servo cylinder 11 and the right servo cylinder 12 are all connected to the hydraulic system; the three servo cylinders are hydraulic cylinders.

[0024] Splines 28 are provided at the outer end of the outer extension rod 27 connected to the piston of the bottom servo cylinder 10, the outer end of the outer extension rod connected to the piston of the left servo cylinder 11, and the outer end of the outer extension rod connected to the piston of the right servo cylinder 12. Hollow output shafts 29 are provided on the bottom worm reducer 18, the left worm reducer 21, and the right worm reducer 24. The outer end of the outer extension rod connected to the piston is mechanically connected to the hollow output shaft 29 through the spline 28; the roller surface of the bottom centering roller 13, the roller surface of the left centering roller 14, and the roller surface of the right centering roller 15 are all inwardly concave curved surfaces.

[0025] A position sensor probe insertion hole 22 is provided on the outer extension rod 27, and a position sensor 19 is connected to the outer end of the outer extension rod 27. A sensor probe 25 of the position sensor 19 is provided in the position sensor probe insertion hole 22, and the position sensor 19 is electrically connected to the hydraulic system.

[0026] A positioning and adjustment method for a three-roller centering device with high-precision positioning, characterized by the following steps:

[0027] The first step is to determine the feed angle and rolling angle formed between the bottom centering roller 13, the left centering roller 14 and the right centering roller 15 and the rough tube 26 according to the outer diameter of the rough tube 26 to be rolled, and rotate the pistons in the three centering rollers through the bottom hydraulic motor 17, the left hydraulic motor 20 and the right hydraulic motor 23 respectively, so that the centering rollers and the top rod 16 form an envelope contact on the circumference during the rough tube rolling process;

[0028] Step 2: Through the hydraulic system, hydraulic oil is injected into the three servo cylinders through the upper and lower oil inlets 31 and 32 of the cylinder body, respectively. The piston 30 in the servo cylinder drives the three centering rollers to clamp the ejector rod 16 synchronously, thereby completing the stable positioning of the ejector rod 16 during the perforation.

[0029] Step 3: When the rolled rough pipe rotates along the top rod 16 to the clamping position of the three centering rollers, the three centering rollers are controlled by the hydraulic system to rise outwards by a certain distance synchronously, so that the rough pipe 26 passes through and forms a limit for the rough pipe 26;

[0030] Step 4. After the rough tube is rolled, the central axis of the bottom centering roller 13, the central axis of the left centering roller 14 and the central axis of the right centering roller 15 are adjusted to a position perpendicular to the central axis of the push rod 16 by the bottom hydraulic motor 17, the left hydraulic motor 20 and the right hydraulic motor 23 respectively, so that the bottom centering roller 13, the left centering roller 14 and the right centering roller 15 form a retreat conveying roller for the push rod 16 and the rough tube 26.

Claims

1. A positioning and adjustment method for a high-precision positioning three-roller centering device, which is performed by the high-precision positioning three-roller centering device, the high-precision positioning three-roller centering device comprising a hydraulic system, a frame bottom plate (1), a rear vertical plate (2) and a front vertical plate (4) are fixedly arranged on the frame bottom plate (1) in parallel with each other, a rear vertical plate U-shaped groove (3) is arranged at the top end of the rear vertical plate (2), a front vertical plate U-shaped groove (5) is arranged at the top end of the front vertical plate (4), the rear vertical plate U-shaped groove (3) and the front vertical plate U-shaped groove (5) are arranged correspondingly, and a bottom servo cylinder mounting plate (7), a left servo cylinder mounting plate (8) and a left servo cylinder mounting plate (9) are fixedly arranged between the rear vertical plate (2) and the front vertical plate (4). The bottom servo cylinder mounting plate (8) and the right servo cylinder mounting plate (9) are provided on the frame bottom plate (1) through a through hole (6). The midline of the bottom servo cylinder mounting plate (7), the midline of the left servo cylinder mounting plate (8) and the midline of the right servo cylinder mounting plate (9) are 120 degrees to each other in space. The bottom servo cylinder (10) is provided on the bottom servo cylinder mounting plate (7). The left servo cylinder (11) is provided on the left servo cylinder mounting plate (8). The right servo cylinder (12) is provided on the right servo cylinder mounting plate (9). The bottom centering roller (12) is connected to the inner side extending rod connected to the piston of the bottom servo cylinder (10). 3), a left centering roller (14) is connected to the inner extension rod connected to the piston of the left servo cylinder (11), a right centering roller (15) is connected to the inner extension rod connected to the piston of the right servo cylinder (12), a top rod (16) is arranged between the bottom centering roller (13), the left centering roller (14) and the right centering roller (15), a capillary tube (26) is arranged on the top rod (16), and the lower end of the bottom servo cylinder (10) passes through the bottom servo cylinder through hole (6) and is arranged below the frame bottom plate (1); a bottom turbine reducer is connected to the outer extension rod connected to the piston of the bottom servo cylinder (10) A gear machine (18), a bottom hydraulic motor (17) is connected to the bottom turbine reducer (18), a left turbine reducer (21) is connected to the outer extension rod connected to the piston of the left servo cylinder (11), a left hydraulic motor (20) is connected to the left turbine reducer (21), a right turbine reducer (24) is connected to the outer extension rod connected to the piston of the right servo cylinder (12), and a right hydraulic motor (23) is connected to the right turbine reducer (24); the bottom servo cylinder (10), the left servo cylinder (11) and the right servo cylinder (12) are all connected to the hydraulic system; the positioning adjustment method comprises the following steps: The first step is to determine the feed angle and rolling angle formed between the bottom centering roller (13), the left centering roller (14) and the right centering roller (15) and the rough tube (26) according to the outer diameter of the rough tube (26) to be rolled, and to rotate the pistons in the three centering rollers by means of the bottom hydraulic motor (17), the left hydraulic motor (20) and the right hydraulic motor (23) respectively, so that the centering rollers and the top rod (16) form an envelope contact on the circumference during the rough tube rolling process; Step 2: Hydraulic oil is injected into the three servo cylinders through the hydraulic system, and the pistons in the servo cylinders drive the three centering rollers to synchronously clamp the ejector rod (16), thereby completing the stable positioning of the ejector rod (16) during the perforation. Step 3: When the rough tube being rolled rotates along the push rod (16) to the clamping position of the three centering rollers, the three centering rollers are controlled by the hydraulic system to synchronously rise outward by a certain distance, so that the rough tube (26) passes through and forms a limit for the rough tube (26); Step 4. After the rough tube is rolled, the center axis of the bottom centering roller (13), the center axis of the left centering roller (14) and the center axis of the right centering roller (15) are adjusted to a position perpendicular to the center axis of the push rod (16) by the bottom hydraulic motor (17), the left hydraulic motor (20) and the right hydraulic motor (23), so that the bottom centering roller (13), the left centering roller (14) and the right centering roller (15) form a return conveying roller for the push rod (16) and the rough tube (26).

2. The positioning and adjustment method of a three-roller centering device with high-precision positioning according to claim 1 is characterized in that: A spline (28) is provided at the outer end of the outer extension rod (27) connected to the piston of the bottom servo cylinder (10), the outer end of the outer extension rod connected to the piston of the left servo cylinder (11), and the outer end of the outer extension rod connected to the piston of the right servo cylinder (12). A hollow output shaft (29) is provided on the bottom turbine reducer (18), the left turbine reducer (21), and the right turbine reducer (24). The outer end of the outer extension rod connected to the piston is mechanically connected to the hollow output shaft (29) through the spline (28). The roller surface of the bottom centering roller (13), the roller surface of the left centering roller (14), and the roller surface of the right centering roller (15) are all inwardly concave curved surfaces.

3. The positioning and adjustment method of a three-roller centering device with high-precision positioning according to claim 2 is characterized in that: A position sensor probe insertion hole (22) is provided on the outer extension rod (27), a position sensor (19) is connected to the outer end of the outer extension rod (27), a sensor probe rod (25) of the position sensor (19) is arranged in the position sensor probe insertion hole (22), and the position sensor (19) is electrically connected to the hydraulic system.

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