JPS5910877B2 - Inner clamper device with backing member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner clamper device with a backing member,
More specifically, the present invention relates to an inner clamper device with a backing member for aligning the grooves of a joint used when butt welding steel pipes from the outside and for forming an underwave bead during welding.

Conventionally, when laying pipelines, etc., when the openings of steel pipes are brought together and welded, not only the centering work but also the formation of a bead on the back side of the mating part and the prevention of penetration have been carried out. The backing work required a lot of time and effort.

For this reason, automation of such welding work has been significantly delayed. Recently, in j0, for example, Utility Model Publication No. 49-37927 and Special Publication No. 52-2290
As seen in Publication No. 5, a so-called inner clamper device has been developed that can relatively easily lock the openings of a steel pipe from the inside, thereby pre-fixing the welded part15. . Among these conventional examples, Utility Model Publication No. 49-379
The device described in No. 27 always urges a plurality of backing heads in a direction away from the machine core by the action of a spring, and locks the backing heads with a 20 clamp head installed in close proximity. Since the configuration is adopted to ensure the integrity of the operation, the pressing force of the backing head in the outer circumferential direction depends entirely on the compressive force of the spring.

However, during use 25, the backing head of the inner clamper device is always in a state of repeatedly supporting the high-temperature Uranami bead. As a result, the spring is continuously annealed, and as a result, the spring function deteriorates over time and no longer functions as a backing head, resulting in 30% punch-through or weld failure when welding the weld. There is always an inherent flaw that leads to In addition, the above-mentioned Special Publication Publication No. 52-22
The invention described in No. 905 discloses that one steel pipe of the part to be joined is
First, it is fixed with an expansion member for clamping, and then the expansion member 35 for backing is activated to back the part to be welded, and at the same time, the other steel pipe is clamped to this expansion member for backing. The entire backing expansion member equipped with the clamping member is divided into every other two sets, and each set is separated by two hubs each mounted on a concentric shaft. When one hub is pressed, the plurality of backing expansion members of one set protrude in the outer circumferential direction via the crank arm, and when the other hub is then pressed, the plurality of backing expansion members of the other set protrude outward through the crank arm. The expansion member for backing similarly protrudes in the outer circumferential direction via the crank arm, thereby simultaneously supporting the other steel pipe and one of the steel pipes as a whole, and extending the expansion member for backing against the steel pipe. It can be placed around the inside of the joint.

However, in this prior art, the two hubs are configured to be actuated separately by independent fluid pressure cylinders, and furthermore, in order to actuate the clamp expansion member, a separate dedicated fluid is required. A pressure cylinder is required. Therefore, at least three fluid pressure cylinders are required. Therefore, with this conventional technology, not only is the inner clamper device itself complicated, but also the fluid circuit for controlling it is extremely complicated, resulting in a high failure rate and a large amount of processing and assembly of parts. There has always been the inconvenience of requiring time and effort. The purpose of the present invention is to improve the drawbacks of the above-mentioned prior art, to have a simple structure that does not require high precision in processing each component, to facilitate assembly, and at the same time to improve durability and reduce weight. An object of the present invention is to provide an inner clamper device with a backing member that can improve welding work. The present invention provides a plurality of plunger head portions for locking steel pipes protrudingly disposed on the outer periphery of a housing, a piston rod of a fluid pressure cylinder that drives each of the plunger head portions to be pushed out or retracted via a plunger and a crank arm, and In an inner clamper device with a backing member, the inner clamper device includes two types of backing members, each of which includes a plurality of backing members that protrude from the outer periphery of the housing in close proximity to the plunger head portion and are successively and alternately arranged adjacent to each other. The members are pivotally supported at approximately equal intervals by a disc-shaped hub via a plunger and a crank arm, respectively, and the disc-shaped hub is fixed to the piston rod, and further, among the adjacent surfaces of the two types of backing members, One of the crank arms is formed in a fan shape and the other in an inverted fan shape, and a power delay transmission mechanism is provided on each of the crank arms connected to each of the other inverted fan shaped backing members, thereby achieving the above purpose. This is what we are trying to achieve.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 indicates a housing.

This housing 1 is composed of housing cases 2 and 3 and a housing body 4 formed in an annular shape. The housing cases 2 and 3 are integrally connected to each other to face each other via a housing body 4, and fluid pressure cylinders 5 and 6 each housing a piston 5A and 6A are individually installed at the outer ends in the left and right direction. It is installed. In this embodiment, a predetermined amount of compressed air is fed into the fluid pressure cylinders 5 and 6 under the control of a pneumatic control device (not shown), so that the pistons 5A and 6A are moved to the left and right, respectively, as necessary. It's getting old. Said piston 5A
, 6A has a piston rod 7 as shown in the figure.
, 8 are provided extending into the housing 1, passing through the housing cases 2 and 3 and being supported by the housing cases 2 and 3, respectively. Of these piston rods 7 and 8, the piston rod 7 is connected to the housing 1.
Three stages 7A, 7B, and 7C are sequentially formed in the inner part to be narrower, and the tip end 7C is slidably inserted into the bottomed hole 8A formed in the other piston rod 8. It is supported by the housing 3 via. The housing 1 of the piston rod 8
A step portion 8C for hub locking is formed in the inwardly protruding portion, and a disk-shaped first hub 10 having a constant thickness is fixed to this step portion 8C.

As shown in FIG. 3, cutting grooves 10A, 10A, . . . are provided around the first hub 10 at approximately equal intervals at a plurality of locations (12 locations in FIG. One end of the crank arm 11 is in each cut groove 10A, and
It is rotatably pivoted in a direction perpendicular to the hub 10 of. Each of these crank arms 11. The other end portion is connected to the housing body 4 corresponding to each crank arm 11.
Plungers 12, 12, equipped at 12 locations around the
It is pivoted on... Here, the plunger 12,
12, . . . and its peripheral mechanisms will be explained in more detail. First, the plungers 12, 12, . . .
As mentioned above, the sliding through holes 13 are formed at approximately equal intervals around the right end of the housing body 4 in FIG.
...is slidably equipped. Each plunger 12 has a plunger head 14,1 at its outer end.
4,... are each fixedly equipped. As shown in FIG. 3, each of these plunger head portions 14 includes a head body 14A that is formed somewhat elongated along the circumferential direction, and a pivot support that is spaced at a predetermined distance along the longitudinal direction of the head body 14A. The head body 14A is integrated with the plunger 12 by being screwed to the plunger 12 at its center. There is. In this way, the above-mentioned fluid pressure cylinder 6, piston 6A, piston rod 8, first hub 10, a plurality of crank arms 11, and plungers 12 each pivotally supported at the outer end of the crank arm 11. and a plunger head 1 fixed to each outer end of the plunger 12.
4 form a first expansion locking mechanism K1 for locking one of the steel pipes A shown by imaginary lines in the upper and lower portions of FIG. 1 from the inside thereof.

As a result, when the piston 6A is moved to the left in FIG. 1 by pneumatic control, the piston rod 8 and the first hub 10, which are integrated with the piston 6A, are moved to the left in the figure. The linear motion of the first hub 10 and piston rod 8 along the mechanical core is converted into a motion of the plunger 12 in the outer circumferential direction, that is, a linear motion in a direction away from the mechanical core, by the up-and-down motion of the crank arm 11. As described above, this allows the open end of one of the steel pipes A to be locked from the inside. On the other hand, the step portion 7A of the piston rod 7 is provided with the first hub 1.
A second nozzle 20 having substantially the same shape as 0 is fixedly installed.

The crank arms 21, 21 are inserted into the cutting grooves 20A, 20A, . . . formed at equal intervals around the second hub 20.
, . . . are pivotally supported so as to be rotatable in a direction perpendicular to the second hub 20. The other end of each crank arm 21 is connected to a plunger 22, 22 provided around the left end of the housing body 4 in FIG. ,... is pivotally supported. At the outer end of each of these plungers 22, there is provided a plunger head portion 2 similar to the first expansion locking mechanism K1 described above.
4 is fixedly equipped. In the second expansion locking mechanism K2 formed in this way, the piston 5A, the piston rod 7, and the second hub 20 are biased by air pressure, similarly to the first expansion locking mechanism K1 described above. When the plunger 22 is moved to the right in FIG. 1, the plunger 22 is converted into a linear motion in the outer circumferential direction, that is, in the direction away from the machine core, and is pushed out through the crank arm 21. The steel pipes B to be welded shown in the upper and lower positions in FIG. 1 can be securely locked around the inner periphery. A backing mechanism UR is provided between the first expansion locking mechanism K1 and the second expansion locking mechanism K2, as disclosed in FIG. 1. This backing mechanism UR is
A third hub 30 is fixedly attached to the stepped portion 7B of the piston rod 7, and two types of crank arms 31A, 31A are pivotally supported around the third hub 30 at approximately equal intervals and every other. ,...,31B,31B,...
It is composed of a plunger 32 connected to each outer end of each of these crank arms 31A, 31B, and an inverted fan-shaped backing member 34A or a fan-shaped backing member 34B fixed to the outer end of each plunger 32. There is. To explain this in more detail, the third hub 30 has substantially the same shape as the second hub 20 described above, and has a plurality of locations around it (12 locations in this embodiment) at approximately equal intervals for comparison. It has a cutting groove 30A that is cut deeply. In each of the cutting grooves 30A formed in the third hub 30, each end of the one crank arm 31A and the other crank arm 31B is pivotally supported. It is arranged so that it can be moved up and down in the direction of separation. Each of the plungers 32, 32, . . . of the backing mechanism UR includes a plurality of plungers 32, 32, . . . It is slidably inserted into sliding through holes 33 formed at approximately equal intervals.

The outer end of each of the crank arms 31A, 31B is rotatably connected to the end of each plunger 32 on the machine core side. Thereby, the lifting force z of each crank arm 31A, 31B is converted into a linear motion of each plunger 32. Further, backing members 34A and 34B are alternately fixed to the outer ends of each of the plungers 32 via backing fixing plates 35.

That is, as shown in FIG.
1A, 31A, . . . is fixedly equipped with an inverted fan-shaped backing member 34A via a backing fixing plate 35, as shown in FIG. A fan-shaped backing member 34B is fixedly attached to the plunger 32 connected to the plungers 31B, 31B, . . . via a backing fixing plate, as shown in FIGS. 6 and 7. As is clear from FIG. 5, the inverted fan-shaped backing member 34A has an outer end surface 40 formed in an arc shape, and the corners at both lower ends in the longitudinal direction form tapered surfaces 41. Further, as is clear from FIG. 6, the other fan-shaped backing member 34B has an outer end surface 50 forming an arcuate surface with the same curvature as the arc of the inverted fan-shaped backing member 34A, and its longitudinal direction is The corner portions at both upper ends form an inverted tapered surface 51. And each of these backing members 34A,
34B are arranged as shown in FIG. 4 and fixedly attached to each plunger 32, and when the entire plunger 32 is pushed out a predetermined distance toward the outer periphery, each of the backing members 34A , 34B are set on a common circle C,
At the same time, in such a state, each of the backing members 34A
, 34B are configured such that the tapered surfaces 41 and reverse tapered surfaces 51 are in sliding contact with each other. Furthermore, concave portions 42 and 52 are formed in the center of the arcuate surfaces of the outer ends of each of the backing members 34A and 34B, and the welded portions have an orderly and uniform bead formed therein, thereby preventing defects. Welding can be prevented. Of the crank arms 31A and 31B, the crank arm 31B that connects the fan-shaped backing member 34B has an elongated hole 60 at a portion that is pivotally supported by the third hub 30.

Therefore, when the third hub 30 is transferred from the state shown in FIG. 2 to the right side in the figure, first the crank arm 31
Every other plunger 32 is pushed outward via A. During this time, the other crank arm 31B
Due to the action of the elongated hole 60, the other plunger 32 is not pressed at all. On the other hand, the crank arm 31A is connected to the plunger 32 and the inverted fan-shaped backing member 34.
When every other A is pushed out in the outer circumferential direction, the tapered surface 41 of this inverted fan-shaped backing member 34A and the fan-shaped backing member 34
Due to the frictional force between B and the inverted tapered surface 51, the fan-shaped backing member 34B is pushed out little by little in the outer circumferential direction together with the inverted fan-shaped backing member 34A. When the state shown in FIG. 1 is approached, the third hub 3 is attached to the elongated crank arm 31B.
A pressing force of 0 is applied, and the fan-shaped backing member 34B, which had been driven until then, is pushed directly toward the outer circumference by the crank arm 31B, and finally each of the backing members 34A, 34B is pushed out. A continuous ring-shaped backing state with no gaps is set. Conversely, when the clamp is released, the hub 30 in the state shown in FIG. 1 (clamped state) returns to the state shown in FIG. The inverted fan-shaped backing member 34A fixed to begins to retract.

At this time, the other fan-shaped backing member 34B maintains the state shown in FIG. 1 due to the action of the elongated hole 60 of the crank arm 31B.
Next, as the hub 30 approaches the state shown in FIG.
0 is locked, and the crank arm 31
B also begins to retract, and as a result, the fan-shaped backing member 34B fixed to the plunger 32 also begins to retract, returning to the state shown in FIG. In this way, the crank arm 3
The elongated hole 60 of 1B has a function as a power delay transmission mechanism. Next, the overall operation of the above embodiment will be explained.

First, prior to welding the joint between steel pipes A and B, the inner clamper device is placed at the open end of steel pipe A as shown in FIG.

In this case, the first and second expansion locking mechanisms Kl and K2 and the backing locking mechanism UR are in the state shown in FIG. 2. The lower portions of the cross-sectional views in FIGS. 3 and 4 also show this state. Next, compressed air is sent to the right side of the fluid pressure cylinder 6, thereby operating the first expansion locking mechanism K1 as described above, and as shown in the upper part of the cross-sectional view of FIG. , the periphery of the opening of the steel pipe A is locked from the inside by the plurality of plunger head parts 14.

When the steel pipe A is locked in this way, the steel pipe B is subsequently placed at the opening of the steel pipe A, and immediately thereafter, compressed air is sent to the left side of the fluid pressure cylinder 5, and the second
The expansion locking mechanism K2 is activated and functions in the same manner as the first expansion locking mechanism K1 to lock the periphery of the opening of the steel pipe B from the inside. Through this series of operations, the welded parts of the steel pipes A and B are firmly locked, but during this time, especially the second
In the operation process of the expansion locking mechanism K2, the backing mechanism U
R also operates as described above, and when the expansion operation of the second expansion locking mechanism K2 is completed, the backing members 34A and 34B are brought into contact with the inside of the periphery of the welding part, and thereafter, the second expansion locking mechanism K2 is operated until the welding work of the welding part is completed. The setting state as shown in FIG. 1 is maintained.
When the welding work is completed, the compressed air in the fluid pressure cylinders 5 and 6 at both left and right ends in FIG. The mechanism UR returns to the state of FIG. 2 as described above.

Then, the entire device is then transferred to the next welding section and the process is repeated. In the above embodiment, the elongated hole 60 as a power delay transmission mechanism formed in the crank arms 31B, 31B, . The invention is not necessarily limited to this, for example, it may be provided at the connection part with the plunger 32.

In addition, although the above-mentioned embodiment illustrated the case where the first and second expansion locking mechanisms Kl, K2 and the backing mechanism UR were separately provided, the present invention is not necessarily limited to this, and for example, The backing members 34A and 34B of the backing mechanism UR are connected to a second expansion locking mechanism K2 that is installed adjacent to each other.
The crank arms 21, 21 connected to the machine core side of each plunger head 24 are integrally installed in the plunger head 24 of the above-mentioned plunger head 24 in the same manner as the crank arms 31A, 31B of the backing mechanism UR described above. may be formed. In this way, as shown in FIG. 1, the series of mechanisms from the plungers 32, 32 to the hub 30 of the backing mechanism UR, which is separately equipped, becomes unnecessary, and the overall structure is further simplified. Therefore, the failure rate is reduced, weight reduction is further promoted, and the efficiency of welding work can be improved.

As described above, according to the present invention, the expansion and retraction operations of the backing member with respect to the welded portion of two steel pipes can be simultaneously performed by the hydraulic cylinder for locking the steel pipes provided together, and Of the crank arms interposed and connected between two types of backing members and a fluid pressure cylinder that urges their operation, the crank arm is connected to one type of inverted fan-shaped backing member. In addition, a power delay transmission mechanism was installed, whereas conventional backing mechanisms with greater mechanical strength and durability required two fluid pressure cylinders to accommodate two types of backing members. In the present invention, a backing mechanism with equivalent mechanical strength and durability can be obtained by using only one hydraulic cylinder, and therefore, the structure of the entire device is simple and lightweight.
Furthermore, since the power delay transmission mechanism can be simply formed with a long hole, no high processing precision is required for the parts, and the assembly work is extremely easy.Furthermore, as mentioned above, the structure is simple and lightweight. Therefore, it is possible to provide an unprecedented and superior inner clamper device with a backing member that can improve the efficiency of welding work.

[Brief explanation of the drawing]

1 is a sectional view including two types of crank arm parts showing an embodiment of the inner clamper device with a backing member according to the present invention; FIG. 2 is a sectional view showing the state before operation of FIG. 1; Figure 3 is a sectional view taken along the - line in Figure 1, with the lower half showing the state before the operation, and Figure 4 is a sectional view taken along the - line in Figure 1, with the lower half showing the state before the operation. Fig. 5 is an explanatory sectional view of the V section in Fig. 4, Fig. 6 is an explanatory sectional view showing the part in Fig. 4, and Fig. 7 is an explanatory sectional view along the - line in Fig. 6. FIG. 1... Housing, 5, 6... Fluid pressure cylinder, 7, 8... Piston rod, 11,
21... Crank arm, 12, 22...
...Plunger, 14, 24...Plunger head section, 30...Disc-shaped hub, 31A, 31B
・・・・・・Crank arm for backing member, 32...
...Blunger for backing member, 34A, 34B...
... Backing member, 60 ... Elongated hole forming the main part of the power delay transmission mechanism.

Claims (1)

[Claims] 1. A plurality of plunger heads for locking steel pipes protruding from the outer periphery of the housing, a piston rod of a fluid pressure cylinder that drives each plunger head to be pushed out or retracted via a plunger and a crank arm, and the plunger head. In the inner clamper device with a backing member, the inner clamper device includes a plurality of two types of backing members that protrude from the outer periphery of the housing near the housing and are successively and alternately arranged adjacent to each other. , respectively, are pivotally supported at approximately equal intervals by a disc-shaped hub via a plunger and a crank arm, and the disc-shaped hub is fixed to the piston rod, and further, among the adjacent surfaces of the two types of backing members, The backing is characterized in that one side is formed in a fan shape and the other side is formed in an inverted fan shape, and a power delay transmission mechanism is provided on each of the crank arms connected to each of the other inverted fan shaped backing members. Inner clamper device with parts.