JP4242943B2 - 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. 4A, this coupling joint is composed of a gasket 1, two housings 2 and 2 ', a bolt 3 and a nut 4 for fastening and fixing the housing.
[0003]
When connecting the two pipes 5 and 5 ', the grooves 6 are formed on the pipe ends of the pipes 5 and 5' by a groove processing machine. 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. 5A and 5B are views showing an example of the tube end grooving device, where FIG. 5A is a front view and FIG. 5B 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 tube grooving with the conventional tube end grooving device configured as described above, one end of the tube 5 to be grooved is inserted into the annular grooved roller 12 as shown in FIG. The hydraulic supply pump 10 is operated to drive the hydraulic cylinder 15 of the apparatus main 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 with such a conventional pipe end grooving device, as a method of determining the groove depth of the pipe, conventionally, as shown in FIG. 6, the vertical position of the shaft 17 interlocked with the driven roller 13 can be adjusted. The stopper 18 was set, and the groove depth was determined by the stopper 18 coming into contact with the upper surface of the frame housing 11 of the apparatus body 9. When the stopper 18 comes into contact with the upper surface of the main body, the lowering of the driven roller 13 is regulated by the interlocking shaft, and the operation of the operation handle of the hydraulic supply pump becomes heavy. It was.
[0008]
However, when processing a thick pipe, a large pressing force is required. Therefore, the handle operation of the hydraulic supply pump is heavy even during processing, and it is difficult to understand the change when the stopper works. Therefore, the hydraulic pressure is continuously fed more than necessary to increase the distortion of the main body and the positioning shaft. This distortion causes variations in the groove depth. The coupling joint is regulated to have a groove depth within a certain range because of its performance, but the current method has a problem that it requires skill.
[0009]
In view of the above-described conventional problems, the present invention makes it possible to easily know a predetermined depth of a groove to be processed into a processed pipe and prevent variations in the groove depth when performing the groove processing on the processed pipe. It aims at realizing a pipe end grooving device.
[0010]
[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. 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. The end grooving device is characterized in that the device body 21 is provided with a stopper device 23 having a switch 57 that operates when the driven roller 47 reaches a predetermined position after grooving. The switch 57 is actuated by a stopper 49 provided on the piston rod 42 of the hydraulic cylinder 41 so that the position of the switch 57 can be adjusted. According to a third aspect of the present invention, the position of the switch 57 is adjustable on a screw shaft 58 provided in parallel to the piston rod 42 on a driven roller bearing support member 43 driven by the hydraulic cylinder 41. It is characterized by being actuated by a stopper 49.
[0011]
By adopting this configuration, the switch is activated when the depth of the groove to be machined in the processed pipe reaches a predetermined position. Therefore, an alarm device is provided in the switch, or the power source of the drive motor is cut off by the switch. By doing so, groove processing without variation is possible.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are views showing a tube end grooving device according to an embodiment of the present invention. FIG. 1 is a front view, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the present embodiment includes a base 20, an apparatus main body 21 provided on the base, and a hydraulic supply pump 22. The apparatus main body 21 is characterized by the present invention. A certain stopper device 23 is provided.
[0013]
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.
[0014]
As shown in FIGS. 1 and 2, 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. An annular grooved roller 34 is fastened and fixed to one end 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.
[0015]
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.
[0016]
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.
[0017]
Next, FIG. 3 shows a stopper device according to the embodiment of the present invention. In the figure, (a) is a longitudinal sectional view, and (b) is a sectional view taken along the line bb of FIG. In the figure, reference numeral 30 denotes a frame housing, and a hydraulic cylinder 41 is fixed to the frame housing 30. A driven roller is attached to the lower end of the piston rod 42 of the hydraulic cylinder 41 via a bearing (not shown). A bearing support member 43 to be supported is attached. Further, a screw is formed at the upper end of the piston rod 42, and a stopper 49 is attached to the screw so as to be vertically adjustable, and is biased upward by a spring 50.
[0018]
A spring receiver 52 is provided on the upper portion of the hydraulic cylinder 41 via a spacer 51. A lever 54 is rotatably provided on the spacer 51 by a pin 53, and is biased in the direction of arrow A by a spring 55. The lever 54 is provided with an operating pin 54a protruding from a hole provided in the spring receiver 52 and an adjustment screw 54b for pressing the switch. A switch 57 is mounted on the upper surface of the frame housing 30 via an L-shaped mounting bracket 56, and the operating piece 57 a of the switch 57 is positioned so as to be pressed by the adjustment screw 54 b of the lever 54. The switch 57 is connected to an alarm device such as a lamp or buzzer (not shown).
[0019]
The operation of the present embodiment configured as described above will be described with reference to FIGS. First, as shown in FIG. 2, the end of the work tube 60 is fitted into the annular grooved roller 34, the other end or the middle of the work tube 60 is supported by a tube support jig (not shown), and the work tube 60 is set. To do. The tube support jig is provided with a plurality of rotating balls on a vertically movable V-shaped arm, which enables sliding and rotation of the work tube 60 in the longitudinal direction.
[0020]
Next, the stopper 49 is adjusted so that the depth of the groove formed in the tube to be processed becomes a predetermined depth. Next, the drive motor 37 is started, and the oil pressure is supplied to the hydraulic cylinder 41 by operating the hydraulic supply pump while rotating the annular grooved roller 34 via the speed reducer 38, gears 39 and 36, and the shaft 33. Then, the piston of the hydraulic cylinder 41 descends and the driven roller 47 is lowered via the piston rod 42, the bearing support member 43, the bearings 44 and 45, and the shaft 46, and the work tube 60 is pressed against the annular grooved roller 34. The groove 34 a of the annular grooved roller 34 and the driven roller 47 form a groove at the end of the tube 60 to be processed.
[0021]
Groove machining by the driven roller 47 proceeds, and as the piston rod 42 of the hydraulic pressure supply cylinder 41 descends, the stopper 49 also descends and contacts the operating pin 54a of the lever 54 of the stopper device shown in FIG. When the piston rod 42 is further lowered, the stopper 49 presses the operating pin 54a of the lever 54, rotates the lever 54 in the direction opposite to the arrow A against the spring 55, and an operating piece of the switch 57 by the adjusting screw 54b. 57a is pressed to turn on the switch 57. The switch 57 activates a connected alarm device to notify that the groove processing depth has reached a predetermined depth. Thus, if the apparatus is stopped, a groove with a predetermined depth can be formed. Not only the alarm device is connected to the switch 57, but the drive motor can be automatically stopped if the power of the drive motor 37 is turned off by turning on the switch.
[0022]
FIG. 4 is a cross-sectional view showing the main part of another embodiment of the present invention. This embodiment is almost the same as the previous embodiment, and the difference is that the position of the stopper device is changed. That is, in the present embodiment, as shown in FIG. 4, the screw shaft 58 is passed through the bearing support member 43 attached to the piston rod 42 of the hydraulic cylinder 41, and the frame housing 30 is penetrated in parallel to the piston rod 42. A stopper 49 is screwed into the upper part of the screw shaft 58, and a switch 57 operated by the stopper 49 is provided in the frame housing 30.
[0023]
In this embodiment configured as described above, the stopper 49 moves up and down in conjunction with the driven roller 47 via the screw shaft 58 and the bearing support member 43, so that the switch 57 can be adjusted by adjusting the position of the stopper 49. When the driven roller 47 forms a groove having a predetermined depth, the processing can be finished in the same manner as in the previous embodiment.
[0024]
【The invention's effect】
According to the pipe end grooving device of the present invention, by providing a stopper device having a stopper interlocked with a piston rod of a hydraulic cylinder that drives a driven roller up and down and a switch operated by the stopper, a pipe to be processed When the groove is machined, a switch is activated when the driven roller is lowered by a predetermined value to make the groove machining depth reach the predetermined depth, so that variations in the groove depth can be prevented. 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 cross-sectional view taken along line AA in FIG.
3A and 3B show a stopper device according to an embodiment of the present invention, in which FIG. 3A is a longitudinal sectional view, and FIG. 3B is a sectional view taken along line bb in FIG.
FIG. 4 is a cross-sectional view showing a main part of another embodiment of the present invention.
5A and 5B are views for explaining a conventional coupling joint, in which FIG. 5A is an exploded perspective view and FIG. 5B is a cross-sectional view.
6A and 6B are diagrams showing a conventional tube end grooving device, where FIG. 6A is a front view, and FIG. 6B is a side view.
FIG. 7 is a view showing a stopper in a conventional tube end grooving device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Base 21 ... Apparatus main body 22 ... Hydraulic supply pump 23 ... Stopper device 30 ... Frame housing 31 ... Roller bearing 32 ... Ball bearing 33 ... Rotating shaft 34 ... Roller 35 with an annular groove ... Nut 36 ... Manual reduction gear 37 ... Drive motor 38 ... reducer 39 ... small gear 40 ... start / stop switch 41 ... hydraulic cylinder 42 ... piston rod 43 ... bearing support member 44, 45 ... bearing 46 ... shaft 47 ... driven roller 48 ... hose 49 ... stopper 50, 55 ... Spring 51 ... Spacer 52 ... Spring receiver 53 ... Pin 54 ... Lever 56 ... Switch mounting bracket 57 ... Switch 58 ... Screw shaft

Claims (4)

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
A switch (57) disposed on the outer surface of the apparatus body (21);
A stopper device (23) for operating the switch (57) when the driven roller (47) reaches a predetermined position by grooving the device main body (21) ;
A pipe end grooving device comprising means for notifying that the driven roller (47) has reached the predetermined position by the switch (57) being operated by the stopper device (23) . 2. The pipe end groove according to claim 1, wherein the switch (57) is actuated by a stopper (49) provided coaxially so as to be adjustable in position on a piston rod (42) of the hydraulic cylinder (41). Attachment device.   The switch (57) is adjustable in position on a screw shaft (58) provided in parallel to the piston rod (42) on a bearing support member (43) for a driven roller driven by the hydraulic cylinder (41). 2. The tube end grooving device according to claim 1, wherein the tube end grooving device is actuated by a stopper (49) provided. The device according to any one of claims 1 to 3, further comprising means for operating the switch (57) to stop the drive motor (37).

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