JP4212142B2 - Pipe end grooving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube end grooving device. More specifically, the present invention relates to a pipe end grooving device for rolling a groove for fitting a housing of a coupling joint to a pipe end when piping such as water for fire extinguishing, cooling water, and drainage is connected by a coupling joint.
[0002]
[Prior art]
Conventionally, as one of the joints connecting two pipes, a coupling joint that absorbs bending and expansion / contraction of the pipe and is excellent in flexibility has been used. As shown in FIG. 7A, this coupling joint is composed of a gasket 1, two housings 2 and 2 ', and a bolt 3 and a nut 4 for fastening and fixing the housing.
[0003]
When connecting the two pipes 5 and 5 ', a groove 6 is formed on the pipe ends of the pipes 5 and 5' by a groove processing machine, and then, as shown in FIG. The pipe ends of the pipes 5 and 5 'are inserted, the housings 2 and 2' are mounted on the outer periphery of the gasket 1, and the grooves 6 formed in the pipes 5 and 5 'on both sides of the housings 2 and 2'. The two housings 2 and 2 ′ are fastened and fixed by bolts 3 and nuts 4.
[0004]
When the above coupling joint is used, the groove 6 must be formed at the end of the pipe, and a dedicated machine is used for the processing. FIG. 8 is a view showing an example of the tube end grooving device, where (a) is a front view and (b) is a side view. This pipe end grooving device includes a base 8 having three legs 7, an apparatus main body 9 installed on the base 8, and a hydraulic pressure supply pump 10.
[0005]
The apparatus main body 9 has a frame housing 11 having a portion 11a with an upper front portion projecting in an overhang shape, and is rotationally driven via a speed reducer by a drive motor (not shown) below the overhang projecting portion 11a. An annular grooved roller 12 is provided, and a driven roller 13 is vertically movable by a hydraulic cylinder 15 via a bearing member 14 so as to face the annular grooved roller 12 in the overhanging protruding portion 11a. The hydraulic cylinder 15 is connected to the hydraulic pressure supply pump 10 by a hose 16 so as to be supplied with hydraulic pressure. Reference numeral 10 a denotes an operating lever of the hydraulic supply pump 10.
[0006]
In order to perform pipe grooving by the conventional pipe end grooving apparatus configured as described above, one end of the pipe 5 to be grooved on the annular grooved roller 12 as shown in the side view of FIG. Is inserted, the hydraulic pressure supply pump 10 is operated to drive the hydraulic cylinder 15 of the apparatus body, and the driven roller 13 is lowered. At the same time, by rotating the annular grooved roller 12 by a driving motor, the driven roller 13 pushes the tube end portion in contact with the driven roller 13 into the groove of the annular grooved roller 12 to cause plastic deformation, thereby forming an annular groove on the outer periphery of the tube. Can be formed.
[0007]
[Problems to be solved by the invention]
When grooving is performed by such a conventional tube end grooving device, the tube core is slightly misaligned due to vibration at the start of grooving, and in this case, the tube 5 rotates from the annular grooved roller 13 while rotating. There was a problem that the groove could not be formed due to slipping out. For this reason, as shown in FIG. 9B, for example, when the annular grooved roller 12 is driven to rotate clockwise as viewed from the front, the shaft core of the tube 5 to be processed is used as the shaft core of the annular grooved roller 12. On the other hand, a method has been devised in which it is set by swinging leftward (in the direction of arrow A) when viewed from above, and a pressing force F is generated to prevent it from coming off.
[0008]
However, when the swing angle θ of the processed tube 5 is increased, the end surface of the tube 5 is strongly in contact with the flange of the annular grooved roller 13 in proportion to the grooving force, and as a result, the tube end becomes a trumpet shape. Expand the tube. This pipe expansion is not preferable because the gasket is compressed to a predetermined compression force or more when a coupling joint is used. Therefore, it is necessary to stop the swing angle θ to the minimum so that the work tube does not come out of the annular grooved roller. The minimum angle is suitably about 0.3 to 0.5 °.
[0009]
In order to shake the pipe 5 to be processed, the pipe end or the pipe central part is supported by the pipe supporter in accordance with the reference rod 17 set at a predetermined angle as shown in FIG. And set it. However, if the tube 5 to be processed is short, the tube support cannot be used, and a problem that the swing angle cannot be given arises.
[0010]
In view of the above-mentioned conventional problems, the present invention provides a tube end grooving device that can perform grooving by giving an appropriate swing angle even when the grooving tube is short, even when the grooving tube is short. It aims at realizing.
[0011]
[Means for Solving the Problems]
According to a first aspect of the present invention, an apparatus main body 21 is mounted on a base 20, and an annular grooved roller 34 that is rotationally driven by a drive motor 37 and an annular groove of the annular grooved roller 34 are mounted on the apparatus main body 21. 34a, a driven roller 47 which is opposed to the hydraulic cylinder 41 and which is pressed by the hydraulic cylinder 41, and a tube to be grooved in the processed tube by sandwiching the processed tube between the annular grooved roller 34 and the driven roller 47. In the end grooving device, the side surface of the work tube sandwiched between the annular grooved roller 34 and the driven roller 47 can be pressed to the apparatus main body 21 in front of the annular grooved roller 34. An auxiliary roller device 23 having an auxiliary roller 62 is provided. Further, in the second aspect, the auxiliary roller device 23 includes a spring means 59 for urging the auxiliary roller 62 in the central axis direction of the annular grooved roller 34 and an adjusting means for adjusting the initial position of the auxiliary roller 62. 58.
[0012]
By adopting this configuration, as shown in FIG. 6B, the tube 66 to be processed is pressed by the auxiliary roller 62 urged by the spring means 59 of the auxiliary roller device 23 and rotated in the direction of arrow A to swing. An angle θ occurs. This swing angle θ causes the work tube 66 to generate a force F that presses the annular grooved roller 34 in the heel direction, thereby preventing the annular grooved roller 34 from falling off. Further, as the grooving progresses, a biting force F is generated in the processed tube 66 and comes into strong contact with the flange 34b of the annular grooved roller 34. Then, the work tube 66 receives the reaction force -F of the biting force from the flange 34b of the annular grooved roller 34 and tries to follow the axis of the annular grooved roller 34. At this time, the cushion of the spring 59 of the auxiliary roller device works and the processed tube 66 automatically follows the axial center of the annular grooved roller 34, and the biting force of the processed tube 66 is lost, so that the trumpet-shaped expansion of the tube end is prevented. The
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 are views showing a tube end grooving device according to an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a top view, and FIG. It is sectional drawing in a line. As shown in FIGS. 1 to 3, the present embodiment includes a base 20, an apparatus main body 21, a hydraulic supply pump 22, and an auxiliary roller device 23 provided on the base.
[0014]
The base 20 is in the form of a table having four legs 20a, the central part of which is an area for mounting the apparatus main body 21, and the side of the base 20 is an area for mounting the hydraulic supply pump 22, and the hydraulic supply pump 22 is mounted. ing.
[0015]
As shown in FIG. 4, the apparatus main body 21 is provided with a rotation shaft 33 supported by a roller bearing 31 and a ball bearing 32 on a frame housing 30 attached to the base 20, and at one end of the rotation shaft 33. An annular grooved roller 34 is fastened and fixed by a nut 35, and a speed reduction gear 36 is attached to the other end. A drive motor 37 is provided at the rear of the apparatus main body 21 so that the rotary shaft 33 and the annular grooved roller 34 can be driven to rotate via a speed reducer 38 and a small gear 39. Reference numeral 40 denotes a start / stop switch for the drive motor 37.
[0016]
In addition, an overhang 30a is formed on the upper portion of the frame housing 30 so as to protrude in the front of an overhang. A hydraulic cylinder 41 is provided on the overhang 30a, and a piston rod 42 of the hydraulic cylinder 41 is attached to the piston rod 42. A fork-shaped bearing support member 43 is attached, and the bearing support member 43 is provided with a driven roller 47 via two bearings 44 and 45 and a shaft 46. The bearing support member 43 is guided by the key groove, and is supported by the piston rod 42 so that the shaft 46 can move up and down while maintaining parallel to the rotation shaft 33 of the annular grooved roller 34.
[0017]
The driven roller 47 faces the groove 34a of the annular grooved roller 34. The groove 47a provided on the driven roller 47 engages with a disk 34b provided on the annular grooved roller 34 so that both can be positioned. The hydraulic cylinder 41 is connected to the hydraulic supply pump 22 by a hose 48 so that hydraulic pressure is supplied. Reference numeral 49 denotes a stopper that limits the descending of the driven roller.
[0018]
Further, the auxiliary roller device 23 which is a feature of the present invention is attached to the front side of the frame housing 30 with bolts 50 as shown in the front view of FIG. 1, the side view of FIG. 2, and the top view of FIG. . In this case, as shown in FIG. 1, the auxiliary roller device 23 is attached so that the auxiliary roller 62 is positioned obliquely above the axis of the annular grooved roller 34 so that the tube to be processed can be pressed stably. ing.
[0019]
5A and 5B are diagrams showing the auxiliary roller device 23, wherein FIG. 5A is a cross-sectional view taken along the line aa in FIG. 5B, FIG. 5B is a side view, and FIG. In the figure, reference numeral 51 denotes a housing. The housing 51 is provided with a cylindrical portion 52, a box-shaped portion 53 having a U-shaped cross section provided at the lower portion of the cylindrical portion, and a bolt hole 54a for attachment to the apparatus main body. The mounting portion 54 is integrally formed.
[0020]
Inside the cylindrical portion 52, a slider 57 having a screw hole 55 and a key groove 56, an adjustment rod 58 screwed into the slider, and a spring 59 that presses the adjustment rod 58 through the slider. And is covered with a lid 60. The slider 57 can slide up and down in the cylindrical portion 52 but cannot be rotated by a screw 61 engaged with the key groove 56.
[0021]
Further, a lever 63 having a roller 62 is supported by a shaft 64 on the box-shaped portion 53 of the housing 51, and the lever 63 is urged by a spring 65 so as to come into contact with the adjusting rod 58. The urging force of the spring 65 is weaker than the urging force of the spring 59 that presses the slider 57.
[0022]
The operation of the present embodiment configured as described above will be described with reference to FIG. First, as shown in FIG. 3A, the end of the work tube 66 is fitted into the annular grooved roller 34, and then the hydraulic supply pump 22 is operated to lower the driven roller 47 so that the work tube 66 is clamped. Next, when the knob 58a of the adjustment rod 58 of the auxiliary roller device 23 is rotated to bring the roller 62 into contact with the processed tube 66, and when the knob 58a is further rotated, the processed tube 66 is moved as shown in FIG. Pressed in the direction of arrow A produces a swing angle θ.
[0023]
Next, the drive motor 37 is rotated and the hydraulic supply pump 22 is operated to lower the driven roller 47 to start the groove machining. As the grooving progresses, a biting force F is generated in the processed tube 66 and comes into strong contact with the flange 34b of the annular grooved roller 34. Then, the work tube 66 receives the reaction force -F of the biting force from the flange 34b of the annular grooved roller 34 and tries to follow the axis of the annular grooved roller 34. At this time, the cushion of the spring 59 of the auxiliary roller device works and the processed tube 66 automatically follows the axial center of the annular grooved roller 34, and the biting force of the processed tube 66 is lost, so that the trumpet-shaped expansion of the tube end is prevented. The
[0024]
【The invention's effect】
According to the tube end grooving device of the present invention, when the device body is provided with an auxiliary roller device having an auxiliary roller capable of pressing the side surface of the processed tube, when grooving the processed tube, The side surface of the tube to be processed is pressed to generate a swing angle, and as the processing proceeds, the spring cushion of the auxiliary roller device works, and the tube to be processed automatically follows the axis of the annular grooved roller 34. It becomes possible to eliminate the biting force of the tube 66 to be processed and prevent the trumpet-like expansion of the tube end. Thereby, it can contribute to the reliability improvement of the connection of the pipe | tube by a coupling joint.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a side view showing an embodiment of the present invention.
FIG. 3 is a top view showing an embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG. 1. FIG.
5A and 5B are diagrams showing an auxiliary roller device according to an embodiment of the present invention, in which FIG. 5A is a cross-sectional view taken along line aa in FIG. 5B, FIG. 5B is a side view, and FIG. is there.
FIG. 6 is a diagram for explaining the operation of the embodiment of the present invention.
7A and 7B are views for explaining a conventional coupling joint, in which FIG. 7A is an exploded perspective view, and FIG. 7B is a cross-sectional view.
FIGS. 8A and 8B are diagrams showing a conventional tube end grooving device, in which FIG. 8A is a front view and FIG. 8B is a side view.
FIG. 9 is a diagram for explaining a problem to be solved by the invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Base 21 ... Device main body 22 ... Hydraulic supply pump 23 ... Auxiliary roller device 30 ... Frame housing 31 ... Roller bearing 32 ... Ball bearing 33 ... Rotary shaft 34 ... Roller 35 with an annular groove ... Nut 36 ... Reduction gear 37 ... Drive motor 38 ... reducer 39 ... small gear 40 ... switch 41 ... hydraulic cylinder 42 ... piston rod 43 ... bearing support member 44, 45 ... bearing 46 ... shaft 47 ... driven roller 48 ... hose 49 ... stopper 50 ... bolt 51 ... housing 52 ... Cylindrical part 53 ... Box-shaped part 54 ... Mounting part 55 ... Screw hole 56 ... Key groove 57 ... Slider 58 ... Adjusting rod 59, 65 ... Spring 60 ... Cover 61 ... Screw 62 ... Auxiliary roller 63 ... Lever 64 ... axis

Claims (2)

An apparatus main body (21) is mounted on a base (20), and the apparatus main body (21) is provided with an annular grooved roller (34) that is rotationally driven by a drive motor (37), and the annular grooved roller (34). ) And a driven roller (47) that is pressed by the hydraulic cylinder (41) and faces the annular groove (34a), and a work tube is provided between the annular grooved roller (34) and the driven roller (47). In a tube end grooving apparatus that performs grooving on the processed pipe by sandwiching
An auxiliary roller device (23) having an auxiliary roller (62) biased in the central axis direction of the annular grooved roller (34) by a biasing means (59) is provided in the device main body (21),
The auxiliary roller is sandwiched between the annular grooved roller (34) and the driven roller (47) in a state where the tube end of the pipe to be processed is in contact with the flange of the annular grooved roller (34). A tube end grooving device , wherein the side surface of the processing tube is pressed forward of the annular grooved roller (34) . The auxiliary roller device (23) further comprises adjusting means (58) for adjusting the initial position of the auxiliary roller (62),
The adjusting means includes a cylindrical housing, a slider that can slide in the housing, a screw that fixes the slider to the housing, and an adjusting rod that is screwed to the slider. The tube end grooving apparatus according to claim 1, wherein the urging means presses the adjusting rod via the slider.

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