A two-roll piercer centering device

Abstract

The utility model relates to a two -roll piercing machine center calibration technical field, concretely relates to a two -roll piercing machine center calibration device. The utility model provides a two -roll piercing machine center calibration device, two stick piercing machine includes the host frame and roll assembly of piercing machine, and the roll assembly includes two rolls, and includes calibration frame and calibration pole, and the calibration frame includes the first centering head of frame body and install on the frame body, and the first centering head includes first conical body, and the calibration pole includes the second centering head and main pole body that connect, and the second centering head includes second conical body. Use this two -roll piercing machine center calibration device to be able to accurately adjust the rolling center of two -roll piercing machine, to ensure that the rolling center of two -roll piercing machine and the host frame center of piercing machine are basically identical, and then ensured the rolling precision of the pipe, and correction process is simple, fast, and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of center calibration technology for piercing machines, and specifically to a center calibration device for a two-roll piercing machine. Background Technology

[0002] Currently, in the production process of seamless steel pipes, the rolling center of the two-roll piercing mill is a key parameter that affects the rolling accuracy of the tube. Therefore, it is important to ensure that the rolling center of the two-roll piercing mill is consistent with the spatial center of the main frame of the piercing mill.

[0003] However, at present, center calibration of two-roll piercing mill is relatively difficult. Without an effective device to assist, it is difficult to ensure that the rolling center of the two-roll piercing mill is consistent with the center of the main frame of the piercing mill. Utility Model Content

[0004] (I) The problem to be solved by this utility model is: how to provide a two-roll piercing mill center calibration device that can accurately align the rolling center and ensure that the center of the cavity formed by the two rolls is consistent with the spatial center of the main frame.

[0005] (II) Technical Solution

[0006] A center calibration device for a two-roll piercing mill, the two-roll piercing mill includes a main frame of the piercing mill and a roll assembly, the roll assembly includes two rolls, a calibration frame and a calibration rod, the calibration frame includes a frame body and a first centering head mounted on the frame body, the first centering head includes a first cone;

[0007] The calibration rod includes a second centering head and a main rod body connected together. The second centering head includes a second cone. The calibration frame is used to install at a preset position at the entrance end of the main frame of the punching machine. When the calibration frame is installed at a preset position at the exit end of the main frame of the punching machine, the axis of the spatial center of the main frame of the punching machine is collinear with the axis of the first cone.

[0008] One end of the calibration rod passes through the two rollers, and the second centering head of the calibration rod is close to the first centering head.

[0009] According to one embodiment of the present invention, the calibration rod further includes a tail rod and a sliding sleeve. The tail rod is connected to the main rod body by a ball joint, so that the tail rod can rotate arbitrarily relative to the main rod body. The sliding sleeve is sleeved on the main rod body and can slide along the main rod body and the tail rod. The tip of the second cone points away from the tail rod.

[0010] According to one embodiment of the present invention, the calibration frame includes a crossbeam and an L-shaped upright. The first end of the upright is vertically fixed to the crossbeam, the second end of the upright is located on one side of the crossbeam, and the first centering head is installed at the second end of the upright.

[0011] According to one embodiment of the present invention, the upright includes a horizontal plate and an upright plate. The horizontal plate is vertically fixed to the horizontal beam, and the upright plate is vertically fixed to the end of the horizontal plate away from the horizontal beam. The upright plate is parallel to the horizontal beam, and the first centering head is installed on the upright plate.

[0012] According to one embodiment of the present invention, the first centering head includes a cylinder and a first cone connected together, wherein the end face of the first cone is connected to the end face of the cylinder.

[0013] According to one embodiment of the present invention, two horizontal plates are provided, and the vertical plate is fixed between the two horizontal plates. The upright frame also includes two reinforcing plates, each of which corresponds to one of the horizontal plates. The reinforcing plates are fixed between the crossbeam and the corresponding horizontal plate.

[0014] According to one embodiment of the present invention, U-shaped holes are respectively provided at both ends of the crossbeam.

[0015] According to one embodiment of the present invention, the calibration rod includes a bearing block, the bearing block being a rectangular block, and the main rod body includes a first rod body and a second rod body, the first rod body, the bearing block, and the second rod body being connected sequentially.

[0016] According to one embodiment of the present invention, the second centering head includes a cylinder and a second cone connected together, the end face of the second cone is connected to the end face of the cylinder, and the side of the cylinder away from the second cone is connected to the main rod.

[0017] The beneficial effects of this utility model are:

[0018] Using this two-roll piercing mill center calibration device, the rolling center of the two-roll piercing mill can be precisely adjusted to ensure that the rolling center of the two-roll piercing mill is basically consistent with the center of the main frame of the piercing mill, thereby ensuring the rolling accuracy of the tube. Moreover, the calibration process is simple, fast and efficient. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram provided for an embodiment of this utility model;

[0021] Figure 2 A first-view view of the calibration frame provided in an embodiment of this utility model;

[0022] Figure 3 A second-view view of the calibration frame provided in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the calibration rod provided in an embodiment of the present invention.

[0024] Icons: 1. Calibration frame; 101. Crossbeam; 102. Cross plate; 103. Reinforcing plate; 104. First centering head; 105. First cone; 106. Vertical plate; 107. U-shaped hole; 2. Calibration rod; 201. Main rod body; 202. Bearing block; 203. Second centering head; 204. Tail rod; 205. Ball hinge; 206. Second cone; 207. Sliding sleeve; 3. Guide plate; 4. Drilling machine main frame; 5. Roll; 6. Three-roll centering device. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figures 1-4 As shown, one embodiment of the present invention provides a center calibration device for a two-roll piercing machine. The two-roll piercing machine includes a piercing machine main frame 4 and a roll assembly. The roll assembly includes two rolls 5, a calibration frame 1 and a calibration rod 2. The calibration frame 1 includes a frame body and a first centering head 104 installed on the frame body. The first centering head 104 includes a first cone 105.

[0027] The calibration rod 2 includes a second centering head 203 and a main rod body 201 connected to each other. The second centering head 203 includes a second cone 206. The calibration frame 1 is used to install at a preset position at the inlet end of the main frame 4 of the piercing machine. When the calibration frame 1 is installed at the preset position at the outlet end of the main frame 4 of the piercing machine, the axis of the spatial center of the main frame 4 of the piercing machine is collinear with the axis of the first cone 105.

[0028] One end of the calibration rod 2 passes through the two rollers 5, and the second centering head 203 of the calibration rod 2 is close to the first centering head 104.

[0029] It should be noted that the spatial center of the piercing mill main frame 4 refers to the geometric center of the piercing mill main frame 4 (which typically includes the archway, roll box, pressing device, etc.) determined after design, manufacturing, and installation. It is a fixed point in three-dimensional space. This center point is the original reference frame for the installation and adjustment of all components of the entire piercing mill. Ideally, the axial symmetry center of the two rolls 5, the ideal running axis of the push rod, the center line of the guide plate 3 device, etc., should all coincide with this spatial center.

[0030] A two-roll piercing mill typically includes a three-roll centering device 6, which is the core component of the piercing mill. It is primarily used to control the dynamic positioning of the push rod and the tube during the piercing process, ensuring uniform deformation of the tube along the centerline and preventing problems such as uneven wall thickness and equipment wear caused by push rod misalignment. The three-roll centering device 6 usually consists of a frame, a rotating rod, centering rollers, and a hydraulic system. The three centering rollers are arranged in a 120° ring and are driven by hydraulic cylinders to achieve three actions: rod clamping, tube clamping, and opening. Under normal circumstances, the center of the three centering rollers of the three-roll centering device 6 is coaxial with the spatial center of the main frame 4 of the piercing mill.

[0031] From the perspective of the piercing process principle, the spatial center of the main frame is the "absolute reference" for the entire rolling line. The function of the three-roll centering device 6 is to dynamically ensure that the push rod and the tube always move along this reference line. If the center of the three-roll centering device 6 itself is not coaxial with the spatial center of the main frame, then the three-roll centering device 6 will straighten the push rod or tube to an "incorrect center line." Therefore, during equipment installation, installers will use precision optical measuring instruments (such as a laser collimator) to establish a visible center line in space, using the spatial center of the main frame as a reference. Then, using this line as a reference, the frame of the three-roll centering device 6 is initially positioned and installed to ensure that it is approximately aligned.

[0032] Furthermore, even after the frame of the three-roll centering device 6 is installed, the mechanical positions of the three centering rollers themselves and the stroke of the hydraulic cylinders still require fine adjustment. This process typically includes:

[0033] "Zero Position" Adjustment: Adjust the initial positions of the three centering rollers so that when the hydraulic cylinders reach a certain reference position (usually a fixed point where the piston rod is fully retracted or extended), the theoretical inner circle center they form coincides with the center line established by the laser. Synchronization Adjustment: Ensure that the three hydraulic cylinders move synchronously and at the same speed. If one roller moves first, or if the clamping force differs significantly, the push rod may be pushed away from the center.

[0034] In this embodiment, when the calibration frame 1 is installed at the installation station at the entrance end of the main frame 4 of the punching machine, the axis of the first centering head 104 is collinear with the axis of the spatial center of the main frame 4 of the punching machine.

[0035] In this embodiment, when using the two-roll piercing mill center calibration device to calibrate the rolling center of the two-roll piercing mill and the spatial center of the piercing mill main frame 4 (it is assumed that the center between the three centering rolls of the three-roll centering device 6 is coaxial with the spatial center of the piercing mill main frame 4), before the calibration rod 2 is sent into the mill, the three centering rolls of the three-roll centering device 6 are in a fully open state. Then, one end of the calibration rod 2 passes through the rolling space enclosed by the three-roll centering device 6, the two rolls 5 and the guide plate 3 in sequence until the second centering head 203 at the end of the calibration rod 2 is attached to the first centering head 104 of the calibration frame 1. Then, the hydraulic system of the three-roll centering device 6 drives the three centering rolls to close simultaneously, thereby "holding" the tail of the calibration rod 2.

[0036] At this time, the second cone 206 of the second centering head 203 at the end of the calibration rod 2 and the first cone 105 of the first centering head 104 on the calibration frame 1 are aligned, that is, the second centering head 203 at the end of the calibration rod 2 and the first centering head 104 on the calibration frame 1 are collinear. In other words, at this time, the spatial center of the main frame 4 of the perforating machine falls on the axis of the calibration rod 2.

[0037] Next, using the calibration rod 2 as a reference, adjust the relative positions of the rollers 5 and guide plates 3 so that the distances from the two rollers 5 to the calibration rod 2 are the same, and the distances from the two guide plates 3 to the calibration rod 2 are the same. Specifically, first adjust the distances from the two rollers 5 to the surface of the calibration rod 2 until the two rollers 5 are respectively attached to the upper and lower parts of the calibration rod 2. Then adjust the distances from the two guide plates 3 to the surface of the calibration rod 2 until the two guide plates 3 are respectively attached to the front and rear parts of the calibration rod 2.

[0038] It is evident that using this two-roll piercing mill center calibration device can ensure that the rolling center of the two-roll piercing mill is basically consistent with the center of the main frame of the piercing mill, thereby ensuring the rolling accuracy of the tube. Moreover, the calibration process is simple, fast, and highly efficient.

[0039] In this embodiment, as Figure 2 and Figure 3As shown, the calibration frame 1 includes a crossbeam 101 and an L-shaped upright. The upright includes two horizontal plates 102 and an upright plate 106. The two horizontal plates 102 are fixed to the same side of the crossbeam 101 and are perpendicular to the crossbeam 101. One end of the upright plate 106 is fixed between the two horizontal plates 102, and the upright plate 106 is located at the end of the horizontal plate 102 away from the crossbeam 101. A first centering head 104 is installed at the end of the upright plate 106 away from the horizontal plate 102. A U-shaped hole 107 is provided at each end of the crossbeam 101 along its length.

[0040] It should be noted that, as Figure 1 As shown, the calibration frame 1 is fixed to the end face of the inlet end of the main frame 4 of the drilling machine by installing threaded fasteners at the U-shaped holes 107 at both ends of the calibration frame 1.

[0041] In some embodiments, the first centering head 104 is detachably mounted on the upright plate 106, for example, the first centering head 104 is fixed to the upright plate 106 by bolts or pins.

[0042] In some embodiments, such as Figure 2 and Figure 3 As shown, a reinforcing plate 103 is welded between the horizontal plate 102 and the horizontal beam 101. There are two reinforcing plates 103, which are either right-angled trapezoidal or right-angled triangular. One right-angled face of the reinforcing plate 103 is welded to the side of the horizontal beam 101, and the other right-angled face is welded to the horizontal plate 102, thereby improving the structural strength of the entire calibration frame 1.

[0043] In this embodiment, the first centering head 104 and the second centering head 203 have identical structures. The first centering head 104 includes a first cylinder and a first cone 105 connected together, and the second centering head 203 includes a second cylinder and a second cone 206 connected together. Further, the first cylinder of the first centering head 104 is fixed to the upright plate 106, and the first cone 105 points towards the crossbeam 101. The second cylinder of the second centering head 203 is fixed to the end face of the main rod 201, and the second cone 206 is located at the end of the second cone 206 away from the main rod 201.

[0044] It should be noted that, since the tip of the second pair of center heads 203 can be regarded as a point, and the tip of the first pair of center heads 104 is also a point, according to the principle that two points form a line, when the tip of the second cone 206 and the tip of the first cone 105 are aligned and in contact, the axis of the first pair of center heads 104 and the axis of the second pair of center heads 203 must be collinear. The second pair of center heads 203 and the main rod 201 are coaxial. In other words, the first pair of center heads 104, the second pair of center heads 203 and the main rod 201 are coaxial.

[0045] In this embodiment, as Figure 4 As shown, the calibration rod 2 also includes a tail rod 204, a ball joint 205, a bearing block 202, and a sliding sleeve 207. The main rod body 201 includes a first rod body and a second rod body, which are sequentially connected and are coaxial. A second centering head 203 is mounted on the end face of the first rod body away from the bearing block 202. The end of the second rod body away from the bearing block 202 is rotatably connected to the tail rod 204 via the ball joint 205. The sliding sleeve 207 is sleeved on the main rod body 201 and can slide along the main rod body 201 and the tail rod 204. The tip of the second cone 206 points to the side away from the tail rod 204.

[0046] More specifically, the main rod 201 is cylindrical, the tail rod 204 is also cylindrical in shape, and the diameter of the main rod 201 and the tail rod 204 are the same. The sliding sleeve 207 is cylindrical, and the inner diameter of the sliding sleeve 207 is slightly larger than the diameter of the main rod 201.

[0047] In this embodiment, the support block 202 is a rectangular block, such as a cuboid or a cube, and the center of the support block 202 falls on the axis of the first rod.

[0048] It should be noted that the purpose of setting the sliding sleeve 207 is to facilitate the restriction of the rotation of the tail rod 204. When it is necessary for the tail rod 204 to keep the main rod 201 in a straight line, the sliding sleeve 207 can be pushed until both ends of the sliding sleeve 207 fall on the main rod 201 and the tail rod 204 respectively. At this time, the entire ball joint 205 is located inside the sliding sleeve 207. In this way, the tail rod 204 cannot rotate because it is restricted by the sliding sleeve 207. Therefore, the tail rod 204 can keep coaxial with the main rod 201.

[0049] In summary, when using this two-roll piercing mill center calibration device to calibrate the rolling center of the two-roll piercing mill relative to the spatial center of the main frame 4 of the piercing mill, the following steps are typically involved:

[0050] First, the spatial center of the main frame 4 of the punching machine is determined using surveying tools. Then, using the spatial center of the main frame 4 of the punching machine as a reference, the calibration frame 1 is installed on the end face of the entrance end of the main frame 4 of the punching machine, so that the spatial center of the main frame 4 of the punching machine falls on the axis of the first centering head 104 of the calibration frame 1.

[0051] Next, the sliding sleeve 207 is pushed until both ends of the sliding sleeve 207 fall on the main rod 201 and the tail rod 204 respectively, so that the tail rod 204 can be coaxial with the main rod 201. Then, one end of the calibration rod 2 passes through the rolling space formed by the three-roll centering device 6, the two rolls 5 and the guide plate 3 in sequence until the second centering head 203 at the end of the calibration rod 2 approaches the first centering head 104 of the calibration frame 1. Then, the hydraulic system of the three-roll centering device 6 drives the three centering rolls to close simultaneously, thereby "holding" the tail rod 204 of the calibration rod 2.

[0052] At this time, if the center of the three-roll centering device 6 is coaxial with the spatial center of the main frame 4 of the piercing machine, then the second cone 206 of the second centering head 203 at the end of the calibration rod 2 and the first cone 105 of the first centering head 104 on the calibration frame 1 are aligned; that is, the second centering head 203 at the end of the calibration rod 2 and the first centering head 104 on the calibration frame 1 are collinear. In other words, the axis of the calibration rod 2 is coaxial with the hollow center of the main frame 4 of the piercing machine.

[0053] Next, using the calibration rod 2 as a reference, adjust the relative positions of the rollers 5 and guide plates 3 so that the distances from the two rollers 5 to the calibration rod 2 are the same, and the distances from the two guide plates 3 to the calibration rod 2 are the same. Specifically, first adjust the distances from the two rollers 5 to the surface of the calibration rod 2 until the two rollers 5 are respectively attached to the upper and lower parts of the calibration rod 2. Then adjust the distances from the two guide plates 3 to the surface of the calibration rod 2 until the two guide plates 3 are respectively attached to the front and rear parts of the calibration rod 2.

[0054] If the center of the three-roll centering device 6 is not coaxial with the spatial center of the piercing machine main frame 4, that is, the second cone 206 of the second centering head 203 at the end of the calibration rod 2 and the first cone 105 of the first centering head 104 on the calibration frame 1 are misaligned. At this time, push the sliding sleeve 207 so that the sliding sleeve 207 no longer restricts the tail rod 204. Then, adjust the position of the calibration rod 2 in the vertical direction by adjusting the position of the two rollers 5 in the vertical direction until the second centering head 203 of the calibration rod 2 is aligned with the first centering head 104 on the calibration frame 1 in the height direction.

[0055] Then, by adjusting the horizontal positions of the two guide plates 3, the horizontal position of the calibration rod 2 is adjusted until the second centering head 203 of the calibration rod 2 is aligned with the first centering head 104 on the calibration frame 1. At this point, the second centering head 203 at the end of the calibration rod 2 and the first centering head 104 on the calibration frame 1 are aligned, meaning the axis of the main rod body 201 of the calibration rod 2 is coaxial with the spatial center of the main frame 4 of the piercing machine. Finally, the calibration rod 2 and the calibration frame 1 are removed, and the three-roll centering device 6 is calibrated separately.

[0056] It is evident that the center calibration device of this two-roll piercing mill can accurately adjust the rolling center of the two-roll piercing mill to ensure that the rolling center of the two-roll piercing mill is basically consistent with the center of the main frame of the piercing mill, thereby ensuring the rolling accuracy of the tube. Moreover, the calibration process is simple, fast and efficient.

[0057] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A center calibration device for a two-roll piercing mill, the two-roll piercing mill comprising a main frame (4) and a roll assembly, the roll assembly comprising two rolls (5), characterized in that, It includes a calibration frame (1) and a calibration rod (2). The calibration frame (1) includes a frame body and a first centering head (104) mounted on the frame body. The first centering head (104) includes a first cone (105). The calibration rod (2) includes a second centering head (203) and a main rod body (201) connected to each other. The second centering head (203) includes a second cone (206). The calibration frame (1) is used to be installed at a preset position at the entrance end of the main frame (4) of the punching machine. When the calibration frame (1) is installed at the preset position at the exit end of the main frame (4) of the punching machine, the axis of the spatial center of the main frame (4) of the punching machine is collinear with the axis of the first cone (105). One end of the calibration rod (2) passes through the two rollers (5), and the second centering head (203) of the calibration rod (2) is close to the first centering head (104).

2. The center calibration device for a two-roll piercing machine according to claim 1, characterized in that, The calibration rod (2) also includes a tail rod (204) and a sliding sleeve (207). The tail rod (204) is connected to the main rod body (201) by a ball joint (205) so that the tail rod (204) can rotate arbitrarily relative to the main rod body (201). The sliding sleeve (207) is sleeved on the main rod body (201) and can slide along the main rod body (201) and the tail rod (204). The tip of the second cone (206) points away from the tail rod (204).

3. The center calibration device for a two-roll piercing machine according to claim 2, characterized in that, The calibration frame (1) includes a crossbeam (101) and an L-shaped upright. The first end of the upright is vertically fixed to the crossbeam (101), and the second end of the upright is located on one side of the crossbeam (101). The first centering head (104) is installed at the second end of the upright.

4. The center calibration device for a two-roll piercing machine according to claim 3, characterized in that, The support frame includes a horizontal plate (102) and an upright plate (106). The horizontal plate (102) is vertically fixed to the horizontal beam (101), and the upright plate (106) is vertically fixed to the end of the horizontal plate (102) away from the horizontal beam (101). The upright plate (106) is parallel to the horizontal beam (101), and the first centering head (104) is installed on the upright plate (106).

5. The center calibration device for a two-roll piercing machine according to claim 2, characterized in that, The first centering head (104) includes a cylinder and a first cone (105) connected together, with the end face of the first cone (105) connected to the end face of the cylinder.

6. The center calibration device for a two-roll piercing machine according to claim 4, characterized in that, Two horizontal plates (102) are provided, and the vertical plate (106) is fixed between the two horizontal plates (102). The upright frame also includes two reinforcing plates (103), each of which corresponds to one of the horizontal plates (102). The reinforcing plates (103) are fixed between the crossbeam (101) and the corresponding horizontal plate (102).

7. The center calibration device for a two-roll piercing machine according to claim 3, characterized in that, The crossbeam (101) has U-shaped holes (107) at both ends.

8. The center calibration device for a two-roll piercing machine according to claim 1, characterized in that, The calibration rod (2) includes a support block (202), which is a rectangular block. The main rod body (201) includes a first rod body and a second rod body, which are connected in sequence.

9. The center calibration device for a two-roll piercing machine according to claim 1, characterized in that, The second pair of center heads (203) includes a cylinder and a second cone (206) connected together. The end face of the second cone (206) is connected to the end face of the cylinder, and the side of the cylinder away from the second cone (206) is connected to the main rod (201).

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