JPH03213240A - Centering device for pipe - Google Patents

Abstract

PURPOSE:To highly accurately perform predetermined work for a peripheral surface without dislocation of the center position in both end parts of a workpiece by lifting a free rotating roller in a truck side to align center height of both the end parts in the axial line direction of the workpiece to the predetermined height being based on a measuring result of a diameter in both the end parts of the workpiece. CONSTITUTION:When both end parts of a workpiece W are stop-received onto a drum- shaped roller 12 of trucks 1, 2, a displacement amount of a height position between the center of a workpiece fixing rotary device 36 and the center of one end part in the axial line direction of the workpiece W is obtained by drive-running a carriage 6 to a position just above the one truck 1 to protrusion-move a workpiece diameter measuring device and measuring an outside diameter in one end part in the axial line direction of the workpiece W, and the center in its one end part agrees with the center of the workpiece fixing rotary device 36 by lifting a free rotating roller group by the amount corresponding to the displacement amount. Next, the center of the other end part in the axial line direction of the workpiece W agrees with the center of the workpiece fixing rotary device 36 similarly by drive-running the carriage 6 to a position just above the other truck 2.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable, for example, to aligning the center heights of both ends of a steel pipe to the same height when marking a steel pipe. , tube 9R (such as a tubular body or a cylindrical body)
A workpiece centering device that performs circumferential surface machining such as marking on the outer circumferential surface of a workpiece by rotating the workpiece while aligning the center heights of both ends in the axial direction of the workpiece (hereinafter also referred to as the workpiece). It is related to.

(Prior Art) A conventionally known workpiece centering device of this type is a workpiece centering device that is connected to two fixed frames 40 via a drive unloading mechanism 41 such as a panda graph, as schematically shown in FIG. A group of free rotating rollers 43 are mounted on a lifting frame 42 which is supported so as to be able to rise and fall freely, and which rotatably catch the workpiece W at a plurality of locations spaced apart at appropriate intervals in the axial direction of the workpiece.

In the centering device configured as described above, after the workpiece W is received at a plurality of locations in the axial direction by the group of free rotating rollers 43, the workpiece W is held at a predetermined height position so that any one point in the axial direction of the workpiece W is at a predetermined height position. The workpiece W is centered by driving the lifting frame 42 up and down.

(Problem to be Solved by the Invention 8) However, according to the conventional workpiece centering device having the above configuration, since the workpiece is centered by receiving it at multiple locations in the axial direction, the workpiece may be bent or deformed. If there is, it is difficult to match the center height of both ends in the axial direction, and when a workpiece that has been centered is rotated for circumferential surface machining, the center position will fluctuate due to the rotation. As a result, there is a problem in that the accuracy of predetermined peripheral surface processing such as marking is significantly deteriorated.

This invention was made to solve the above-mentioned problems, and even if the workpiece has a bend or deformation, it can be fixed to a predetermined position by eliminating the deviation of the center position of both ends due to the rotation of the workpiece. It is an object of the present invention to provide a workpiece centering device capable of performing peripheral surface machining with high accuracy.

(Means for Solving the Problems) In order to achieve the above object, a workpiece centering device according to the present invention includes two carts each of which is reloaded on a rail laid on a horizontal surface so as to be freely movable. Freely rotating rollers for receiving pipes are mounted on these two carts so that they can be raised and lowered via drive lifting mechanisms, and the two carts are driven to run along rails built above the travel path. It is equipped with a carriage that can be freely transferred, and a pipe diameter measuring device that is attached to the carriage and the above two carts and measures the outer diameter of the pipe by contacting the top and bottom of the pipe in the diametrical direction. It is characterized by what it did.

(Function) According to this invention, depending on the length of the workpiece in the axial direction,
After determining the stopping position of the cart, the workpiece is supported across the frame between the two carts so that both ends in the axial direction are received on the freely rotating rollers of these two carts. 0 Next, drive the second upper carriage to a position directly above one of the carts, and measure the diameter of one end of the workpiece with the workpiece diameter measuring devices installed on this carriage and the cart directly below it, respectively, and Based on the measurement results, the free rotating roller on the two carts is moved up and down to adjust the center height of one end of the workpiece in the axial direction to a predetermined height.

Next, the carriage is driven to a position directly above the other cart, and in the same manner as above, the diameter of the other end of the workpiece is measured and the freely rotating roller is raised and lowered based on the measurement results to determine the axis of the workpiece. Adjust the center height position of the other end in the J direction to a predetermined height.

As described above, the workpiece can be received and supported in a state where the center position of both ends in the axial direction is at a predetermined height. In other words, the workpiece can be centered at both ends in the axial direction.

When the workpiece is rotated in such a centering state, even if the workpiece is bent or deformed, the center height position of both ends in the axial direction will not change. It can be done with high precision.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

ff11 is an overall schematic plan view of the laser marking equipment including the workpiece centering device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a front view of FIG. 1.

In Figures 1 to 13,! and 2 are workpiece trays, these workpiece trays are truck 1.2 is a horizontal floor surface FLJ
-, it is transferred to a pair of left and right rails 3.3E installed on the left and right rails 3.3E, respectively, so that it can be driven and run freely.

4 is a cross-feeding chain conveyor, and the above workpiece receiver is a stand + E.
A plurality of strips are arranged on the lateral side of the traveling route of the first and second wheels, and the structure is such that a plurality of seven-way Ws can be stocked.

5 is a horizontal feed chain conveyor marked L with a workpiece loading of 1 m.
The L workpiece receiver transports the workpieces W transversely fed one by one to the trolley 1, 2.41, and the cylinder 5A
and a carry-in arm 5B. Reference numeral 36 denotes a workpiece fixing/rotating device that fixedly holds one end of the workpiece W carried onto the cart 1.2 in the axial direction and rotates the workpiece W. It is constructed so that it can be held fixed. Further, 37 is a conveyor for carrying out the workpiece W after marking is completed.

Reference numeral 6 denotes a carriage at the -L section, which has support legs 7A, 7A erected outside both ends of the rail 3.3 in the longitudinal direction and on the left and right outer sides of the rails 3, 3, respectively, and support legs 7A at both ends.
Opposing inner surfaces of the left and right beams 7B, 7B of the fixed frame 7 formed in a circular shape by a pair of left and right beams 7B, 7B installed parallel to the rail 3.3 between the t end faces of the rails 7A. It is reloaded so that it can run freely along rails 8, 8 fixed to the board.

4 to 6 are a side view, a plan view, and an IL view showing the specific structure of one of the workpiece holders, and the seventh
8 are a side view and a plan view showing the specific structure of the other workpiece carrier 2. FIG.

In each of these figures, 11 is a truck frame, and one drum-shaped roller 12 and a group of four free-rotating rollers 13 for receiving workpieces are arranged at front and rear positions on this truck frame ll. , 1. The drum-shaped roller 12 is connected to a geared motor 14 installed at the bottom of the truck frame 11 via a sprocket 15 and a chain 16 so as to be freely rotatable. The rollers 131,111 groups are mounted on ball screw jacks 18. which are provided on both left and right sides of the frame 17 that supports these roller groups 13 and 11. Bevel gearbox 38 and motor 19
It is constructed so that it can be freely raised and lowered via a drive raising and lowering mechanism consisting of.

20.20 is a pair of left and right running wheels arranged on the front and rear suspensions at the bottom of the bogie frame 11, and is reproduced in E-marked "Rule 3, 3". is interlocked with a geared motor 24 via a gear 22 fixed to the axle 21 and a gear 23 meshing with the geared motor 24, and the operation of the geared motor 24 moves the bogies 1 and 2 onto the rail 3.
．． It is constructed so that it can be freely driven and run along the line 3.

Since the configuration of the following L is common to both the two trolleys 1 and 2, the corresponding parts are designated with the same reference numerals.

Reference numeral 25 denotes a workpiece diameter measuring device which is provided so as to be freely retractable in the up and down vertical directions via a cylinder 26, and on one of the carts i side, the workpiece diameter measuring device 25 is shown in FIGS. 4 and 5. As shown in FIG. On the side, the workpiece diameter measuring device 25 is disposed in a notch 27 formed at the rear end of the bogie frame 11 at the center of its left and right width, as shown in FIGS. 7 and 8J. installed.

1 and 10 are a side view and a front view showing the specific structure of the carriage 6, and in the same figure,
Reference numeral 28 denotes a carriage frame, which is disposed on one side of the carriage frame 2B and is connected to a drive pinion 31 directly connected to a servo motor 30 via a reducer 29 and one of the pair of left and right rails 8.8. The carriage 6 is configured to run along the rail 8.8 via a rack 32 fixed to the rail 8.

Reference numeral 33 denotes a workpiece diameter measuring device which is provided so as to be freely retractable up and down in vertical directions via a cylinder 34, and 35 is a laser marking device, both of which are also installed on the carriage frame 28.

Next, the operation of the above configuration will be explained.

Among the two carts 1.2, one cart 1 is driven to a predetermined position and stops regardless of the length of the workpiece W, while the other cart 2 is driven to a predetermined position regardless of the length of the workpiece W. The vehicle travels on the rail 3.3 according to the location and stops at the location. At this time, the free-rotating rollers 13 and 2 of the included rollers 13 and 13 are respectively drum-shaped rollers 12.
It is located below by the work receiving surface No. 12.

In this state, among the plurality of workpieces W stocked on the cross-feeding chain conveyor 4F, the first workpiece W is transferred to the two carts 1 by the workpiece carry-in device 5.
, 2, h, and both ends of the workpiece W in the axial direction are received by the hourglass-shaped rollers 12, 121 of the truck 1.2.

Next, the upper carriage 6 is driven to a position on three sides of one of the carriages 1 and then stopped.

Subsequently, the workpiece diameter measuring devices 33 and 25 attached to the carriage 6 and one of the trolleys L move to protrude and contact two points below L in the diametrical direction on the outer peripheral surface of the workpiece W, thereby aligning the axis of the workpiece W. The outer diameter of one end in the direction is measured, and from the measurement result, the amount of displacement in the height position between the center of the workpiece fixing and rotating device 36 and the center of one end in the axial direction of the workpiece W is determined, and the amount of displacement is equivalent to the amount of displacement. By operating the motor 19 by the same amount and raising the group of freely rotating rollers 13 via the ball screw jack 18, the center of one end of the workpiece W in the axial direction is moved to the workpiece fixing rotation device M36.
match the center of

Next, the gear ridge 6 is driven along the rail 8.8 via the servo motor 30, the reduction mechanism 29, the drive pinion 31, and the rack 32 to a position directly above the blade of the externally powered truck 2, and then stopped. In this state, the outer diameter of the other end in the axial direction of the workpiece W is measured via the workpiece diameter measurement @71133 and 25, and based on the measurement results, the free rotating roller 13 and - By raising the group, the center of the other end of the workpiece W in the axial direction is brought into alignment with the center of the workpiece fixing and rotating device [36].

Through the above-1-1, the workpiece W is centered so that the centers of both ends in the axial direction coincide with the center of the workpiece fixing and rotating device 136, and in this centered state, the workpiece W is moved through the workpiece fixing and rotating device 36. , while rotating on the free rotating rollers 13..., 13, 11 groups of each carriage 1.2.

By performing a prescribed marking process using the laser marking device @35, for example, even if the workpiece W is bent or deformed, the center position of the marking area will not change.
Predetermined marking processing can be performed with high precision.

(Effect of the invention) As described above, according to the present invention, by changing the positions of the two carts according to the axial length of the workpiece, the axial line of the workpiece can be adjusted regardless of the length. It is rotatably received only at both ends in the direction, and the center height positions of both ends can be easily adjusted. Further, even if there is a bend or deformation in the axially intermediate portion of the workpiece, it is possible to prevent the center position of both axially end portions from changing as the workpiece rotates. Therefore, no matter what diameter or length the workpiece is, it is possible to carry out predetermined circumferential surface machining 1, such as marking L, with high precision while rotating the workpiece.

[Brief explanation of drawings]

Figure 1 is a schematic plan view of the entire laser marking equipment including a workpiece centering device, Figure 2 is a side view of Figure 1,
Figure 3 is a front view of Figure 1, and Figures 4 to 6 are! One workpiece holder is a side view, a plan view, and a front view showing the specific structure of the cart, and FIGS. 9 and 10 are side and plan views showing the specific structure of the carriage, and FIG.
It is a schematic side view showing aR. 1.2... Workpiece receiver is a trolley, 3-... Rail, 6...
・Carriage, 13... Freely rotating roller for receiving the workpiece 18... Ball screw jack, 19...
・Motor, 20... Traveling wheel, 24... Guard motor, 25.33... Workpiece diameter measuring device, 30...
Servo motor, 31... pinion, 32... rack.

Claims (1)

[Claims] (1) Two trolleys each mounted on a rail laid on a horizontal surface so that they can be driven and run freely, and a tube receiver that is mounted on these two trolleys so that they can be raised and lowered via a drive lifting mechanism. A free-rotating roller, a carriage that is reloaded so that it can be freely driven and run along a rail built above the traveling path of the above-mentioned two carts, and a carriage that is attached to this carriage and the above-mentioned two carts, respectively, and is used to transport pipes. 1. A tube centering device comprising: a tube diameter measuring device that measures the outer diameter of the tube by contacting two points, upper and lower in the diameter direction.