JPH03213237A - Clamp device for pipe - Google Patents

Abstract

PURPOSE:To surely and stably clamp a workpiece despite a change of its diameter by transferring the workpiece onto a lower part clamp block and horizontally moving a pair of clamp blocks in the direction of approaching each other at an equal speed with an equal quantity to make three points brought into contact with the peripheral surface of the workpiece. CONSTITUTION:A pipe W is clamped with three points, of mutually reversely tilted clamp surfaces 31l, 31r and an upper surface of a lower part clamp block 40, respectively brought into contact with the peripheral surface of the pipe W by lifting the lower part clamp block 40 to an upper part a little from a conveying surface of a roller conveyer and transferring a point end part of the pipe W onto the lower part clamp block 40 from the conveyer next horizontally moving a pair of right and left clamp blocks 31R, 31L in the direction of approaching each other at an equal speed with an equal quantity, in the point of time the pipe W is conveyed and stopped in a predetermined edge preparation position. The clamp points P1, P2, P3, related to the peripheral surface of the pipe W, are obtained in an equal three-part divided points in the peripheral direction even when an outside diameter D of the pipe W is different, so that uniform clamp force can be applied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is mainly applied to the case where the end of a steel pipe is fixed and held when the end face of the steel pipe is grooved. A conveying end portion of a workpiece conveying device that conveys a pipe to be processed (including a cylindrical body as well as a tubular body, hereinafter referred to as a workpiece) along its axial direction, and a processing machine that processes an end portion of the workpiece. This invention relates to a clamp device that is installed between the workpieces and fixes and holds the ends of the workpieces.

(Prior Art) This type of clamp device has been known in the past.

(A) As shown in FIG. 8, a lower clamp block l having a flat clamping surface 1a that makes point contact with the lower circumferential surface of the workpiece W, and a mutually opposite lower clamping block l that makes point contact with the left and right sides of the upper circumferential surface of the workpiece W, respectively. Inverted V with inclined clamping surfaces 2a, 2b
The workpiece W is clamped at three points PL, P2 . P3 is configured to clamp, and (B) is configured to clamp at points opposite to each other as shown in Figure 9.
M clamping surfaces 3a, 3b and 4a.

4b, the work W is moved to four points P1. P2.
P3. It is configured to be clamped at P4.

There is.

(M1ll to be Solved by the Invention) Among the conventional pipe clamping devices described above, the one shown in (A) is: - Since the shape of the upper clamp block 2 remains constant, the diameter of the workpiece W is different. and three clamp points PL, P2. As shown in FIG. 8, P3 is the workpiece W
is displaced along the outer peripheral surface of the workpiece W, and when a clamping force is applied, each clamping point PI, P2 . The force applied to P3 becomes nonuniform, resulting in deformation of the workpiece W, and unstable fixation, making it impossible to apply desired end pressure.

In addition, in the case shown in (B), a stable clamping condition can be obtained regardless of changes in the diameter of the workpiece W, but regardless of the difference in the diameter of the workpiece W, the center position ItO of the workpiece W during clamping is As shown in FIG. 9, since the height is constant, when the workpiece W is carried into the clamping device, the workpiece W itself is raised and lowered to align the center! eM is required, and the structure of the entire device is complicated accordingly, which has the drawback of causing great damage.

This invention was made to solve the above-mentioned problems, and applies a uniform force to three equal parts of the outer circumference of the workpiece W, regardless of changes in the diameter of the workpiece W.

To provide a clamping device for pipes that can clamp a workpiece reliably and stably without causing deformation, etc., and can simplify the overall structure without requiring a centering device.

(Means for Solving the Problem) In order to achieve the object described in E, the pipe clamp device according to the present invention includes a pair of left and right clamps having clamp surfaces that are at equal angles to the horizontal plane and oppositely inclined to each other. a block, a clamp block drive mechanism that moves the pair of left and right clamp blocks horizontally at the same speed and in opposite directions, a lower clamp block built into the center of the lower part of the device, and this lower clamp block. The apparatus is characterized by comprising an elevating and lowering drive mechanism that moves the pipes up and down with respect to the transporting surface of the tube transporting device.

In addition, the tube clamping device according to the invention described in claim 2 is provided at a plurality of clamping stations spaced apart at appropriate intervals by seven points in the conveying direction of the tube conveying device, and applied to both left and right sides of the lower circumferential surface of the workpiece. A centering device is installed that includes a pair of arms that can be connected to each other, a left and right arm lifting mechanism that lifts and lowers the left and right pairs of arms individually, and a left and right arm simultaneous lifting and lowering mechanism that lifts and lowers the left and right pairs of arms simultaneously. .

Further, in the tube clamp device according to the third aspect of the invention, the clamp surfaces of the pair of left and right clamp blocks that are inclined in opposite directions to each other are set at an angle of inclination of 60'' with respect to the horizontal plane.

(Function) According to the present invention, by lifting the lower clamp block with the workpiece carried to a predetermined processing position via the conveyance device, a portion of the workpiece is transferred onto the clamp block, and then the workpiece is clamped. By horizontally moving the left and right pair of clamp blocks at an equal speed in a direction approaching each other via a block drive device, the clamp surfaces of the left and right pair of clamp blocks that are inclined in opposite directions to each other and the upper surface of the lower clamp block are 3 points are outside the workpiece
Clamps the work by contacting each of the four sides.

At this time, the clamping point on the outer peripheral surface of the workpiece is set as a point dividing the workpiece into three equal parts in the circumferential direction, regardless of changes in the diameter of the workpiece.
Since uniform force can be applied to these three points, the workpiece can be clamped stably without deforming it.

In addition, according to the invention described in claim 2, if the workpiece is bent, etc. 1, by raising and lowering the pair of left and right arms individually or raising and lowering the pair of left and right arms simultaneously, the alignment of the workpiece can be adjusted. The center height of the workpiece can be adjusted freely.

(Example) Below 1 An example of the present invention will be described based on the drawings.

FIG. 1 is an overall schematic plan view of pipe beveling equipment including a clamp device according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1.

In FIGS. 1 and 2, reference numeral 10 denotes a beveling machine, which is equipped with a rotary face plate 12 on which a beveling tool 11 is attached, which can be raised and lowered. 20 is a roller conveyor (an example of II feeding device) that conveys a pipe W, which is an example of a workpiece, along its axial direction, and a plurality of drum-shaped rollers 22 are arranged in one frame 21.
These rollers 22 are linked to a motor 24 via a chain 23.

30 is a pipe clamp device, which connects the roller conveyor 20
The pipe W is installed between the end of the pipe W and the beveling machine IO, and fixes and holds the end of the pipe W. Details of this pipe clamp device @30 will be described later.

Reference numeral 50 is a chain conveyor for feeding the pipe W, and a chain conveyor 50 is installed on one side of the roller conveyor 20 indicated by L.
Fixed guide rail 51 for feeding and kick-in equipment @5
2 and the pipe W is fed in the direction of the arrow X to be supplied onto the roller conveyor 20. 5
3 is a kick rail [, 54 is a fixed delivery guide rail, and the roller conveyor 2 is moved from above the beveled pipe wt-h in the direction of arrow Y.
0 to the other side.

Reference numeral 60 denotes a centering device, which aligns the h-frame 2 of the roller conveyor 20.
They are installed at a plurality of locations at appropriate intervals in the pipe conveyance direction by the roller conveyor 20 at the lower part of the pipe. Details of this alignment device 50 will also be described later.

3 and 4 are a partially cutaway front view and a partially cutaway side view showing the detailed structure of the pipe clamp device 30, and in the same figure, 31L.

31R is a pair of left and right clamp blocks, which have an inclination angle θ1 of 60' with respect to the horizontal plane. θ2, and has clamp surfaces 31ft and 31r that are oppositely inclined to each other. 32U
, 32D are trapezoidal screws whose racks are horizontally supported by a portion and a lower portion of the clamp device frame 33, respectively, and these trapezoidal screws 32U.

32D is formed with reverse threads on the left and right sides across the center, and these upper and lower trapezoidal threads 32U, 32D
Left and right reverse threaded part 32UllL.

Nut members 34Ui, 34Ur and 34Di, 34 screwed into 32Ur and 32DJ1.32Dr, respectively.
Left and right movable frames 35L and 35R holding Drs at both upper and lower ends
A guide rail 36U is fixed to the upper and lower ends of the underframe 33.

36D so as to be movable in the horizontal direction.

A pair of left and right clamp blocks 31L, 31R are fixed to the left and right movable frames 35L, 35R.

Reference numeral 37 denotes a hydraulic motor, which is disposed on one side of the underframe 33 at an intermediate height between the upper and lower sides.
The upper and lower trapezoidal screws 320 and 32D are interlocked and connected via 9D, and the above-mentioned components create a clamp that horizontally moves the left and right clamp blocks 31L and 31R at the same speed and in opposite directions. A block drive mechanism is configured.

2. In FIGS. 3 and 4, reference numeral 40 denotes a lower clamp block, which is disposed at the center of the lower part of the underframe 33, and is connected to the conveying surface of the roller conveyor 20 via a hydraulic cylinder 41. It is constructed so that it can be moved up and down by driving.

5 and 6 are a front view and a side view showing the detailed structure of the core stand device 60, and in the same figure, 61
L and 61R are a pair of left and right arms, which can swing up and down to the left and right around a support shaft 62 arranged on a vertical line including the center 0 of the pipe W, and are attached to both left and right sides of the lower peripheral surface of the pipe W. It is configured to be able to come into contact with it. 63L and 63R are double-acting hydraulic cylinders that constitute the left and right arm elevating mechanisms, and the upper ends of the movable piston rods 6341 and 63r are pivotally connected to the intermediate portions of the pair of left and right arms 61L and 61R, A pair of left and right arms 61L.

81R can be driven up and down individually.

Reference numeral 64 denotes a single-acting hydraulic cylinder mounted on the underframe 21 of the roller conveyor 20, and its movable piston rod 64a
A bracket 65 that holds an E support shaft 62 is fixed to the upper end of the bracket 65, and a left and right arm simultaneous raising and lowering mechanism that simultaneously raises and lowers the pair of left and right arms 61L and 61R is constituted by the expansion and contraction of this hydraulic cylinder 64.

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

A pipe W arranged on one side of the roller conveyor 20 is guided by a guide rail 51 through a chain conveyor 50 and a kick-in device 52, and fed in the direction of the arrow X in FIG. 1, and is supplied to the roller conveyor 20k. Thereafter, as the roller conveyor 20 is driven, the pipe is transported along the axial direction of the pipe to a predetermined beveling position.

” - The tip of the pipe W transported as shown in the figure is attached to a pair of left and right clamp blocks 3 in the pipe clamp device 30.
1L, 31R and the lower clamp block 40,
The pipe is clamped at three points on its outer peripheral surface, and this pipe clamping operation will be explained in more detail.

When the pipe W is conveyed to a predetermined beveling position by the roller conveyor 20 and stopped, the lower clamp block 40 is raised to a position slightly above the conveyance surface of the roller conveyor 20 via the hydraulic cylinder 41. As a result, the tip portion of the pipe W is transferred from the roller conveyor 20 onto the lower clamp block 40.

Next, the hydraulic motor 37 is operated and its rotational force is applied to the sprockets 380, 380 and the chains 39U, 39D.
Through the upper and lower trapezoidal screws 32U.

32D and these trapezoidal screws 32U.

By driving and rotating 32D, the left and right movable frames 35
A pair of left and right clamp blocks 3 fixed to L and 35R
1L and 31R move horizontally in a direction approaching each other with the same amount and speed, and clamp surfaces 31J1 and 31 with opposite inclinations to each other.
Three points, r and the upper surface of the lower clamp block 40, contact the outer circumferential surface of the pipe W, respectively, and clamp the pipe W.

At this time.

Three clamp points PI, P2.
As shown in FIG. 7, P3 is a trisecting point in the circumferential direction even if the outer diameter of the pipe W is different, and therefore, regardless of the pipe diameter, the two circumferential trisecting points Pi, P2 . It is possible to apply a uniform ramp force to P3, and even if a strong clamping force is applied, the pipe W can be reliably and strongly clamped without causing deformation.

After the above clamping operation is completed, the beveling machine l
After the pipe center and the beveling center are aligned by raising and lowering the rotary face plate 12 of O, the end face of the pipe W is beveled in a predetermined manner by operating the beveling machine IO.

After the beveling process, the unclamped pipe W is conveyed backwards by the roller conveyor 20 to a position where its tip part is detached from the clamp device W130, and then the pipe W is moved through the kickout device 53 by the arrow shown in FIG. It is kicked out in the Y direction and discharged to the other side of the roller conveyor 20 marked E.

In the above series of operations, if there is a bend in the pipe W to be beveled, when the tip of the pipe W is delivered to the clamping device 30, it is By individually raising the left arm 61L or right arm 61R, the alignment of the pipe W is corrected to the left or right, and the bevel surface of the pipe W and the beveling machine 10 are made perpendicular to each other. The desired beveling process can be performed with high precision.

Furthermore, the center height of the pipe W can be adjusted by simultaneously raising or lowering the left and right arms 61L and 61R via the single-acting hydraulic cylinder 64.

(Effects of the Invention) As is clear from the above explanation, when the present invention is used, the clamping method applies a uniform force to three equal parts of the outer peripheral surface of the workpiece, regardless of the diameter of the workpiece. This makes it possible to prevent deformation of the pipe due to uneven clamping points in the circumferential direction, and to clamp the workpiece reliably and stably without wobbling. , it is possible to improve the accuracy of the intended end processing. Moreover, when transporting the workpiece.

There is no need for a special device to raise and lower the work depending on the diameter of the work, and the structure of the entire device can be simplified.

Furthermore, according to the second aspect of the invention, even if the workpiece has an overall bend, the center and center height can be easily adjusted to 211! ! Therefore, it is possible to further improve the desired end processing accuracy.

[Brief explanation of drawings]

Fig. 1 is an overall schematic plan view of a pipe beveling equipment according to an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a partially cutaway front view showing the detailed structure of the pipe clamp device. Figure 4 is a partially cutaway side view of Figure 3, Figure 5V11 is a front view showing the detailed structure of the alignment device, Figure 1isS is a side view of Figure 5, and Figure 7 is an explanation of the pipe clamp state. Figure, 8th
9 and 9 are schematic front views of conventional examples, respectively. lO...Ill end processing machine, 20... Roller conveyor (workpiece conveyance device 1), 31L, 31R... Pair of left and right clamp blocks, 311, 31r... Clamping surface, 32U, 32D... Trapezoid Screw, 37...Hydraulic motor, 40...Lower clamp block, 41...Hydraulic sill, 60...Centering device, 61L, 61R...
- Pair of left and right arms, 63L, 63R...double acting hydraulic cylinder, 64...hydraulic cylinder.

Claims (3)

[Claims] (1) The pipes to be processed are installed between the conveyance terminal end of the pipes conveying device that conveys the pipes to be processed along the axial direction and the processing machine that processes the end of the pipes to be processed. It is a clamping device for pipes that fixes and holds the ends of pipes, and includes a pair of left and right clamp blocks having clamp surfaces that are at equal angles to the horizontal plane and oppositely inclined to each other, and a pair of left and right clamp blocks that are horizontally aligned. A clamp block drive mechanism that moves at the same speed and in opposite directions, a lower clamp block built into the center of the lower part of the device, and this lower clamp block is driven against the conveying surface of the tube conveying device. A clamping device for pipes, characterized by comprising an elevating drive mechanism for elevating and lowering the pipes. (2) A pair of arms that can come into contact with the left and right sides of the lower peripheral surface of the pipe to be processed, and a pair of these left and right arms are installed at multiple locations appropriately spaced apart in the transport direction of the pipe transport device. 2. A clamping device for pipes according to claim 1, further comprising an alignment device comprising a left and right arm elevating mechanism for individually elevating and lowering the left and right arms, and a left and right arm simultaneous elevating mechanism for simultaneously elevating and lowering the pair of left and right arms. (3) The apparatus for clamping pipes according to claim 1, wherein the inclination angles of the clamp surfaces of the pair of left and right clamp blocks are both set to 60 degrees.