KR100825976B1 - Push jack for welding work - Google Patents

Abstract

A push jack for welding operation is provided to allow saddles to be tilted smoothly in a state that the saddles are connected to piston rods, and enable the saddles to be tilted to a relatively large angle. A push jack for welding operation comprises: a cylinder body(10) which has an oil flowing space formed in an inner central part thereof, and which has first and second cylinder spaces(12,13) formed at both sides of an inner part thereof; a spool(24) which is joined with the center of the cylinder body, and which guides oil supplied from a hydraulic hose(32) into the oil flowing space; a rotary block(28) which is rotatably joined with the circumference of the spool, with which the hydraulic hose is joined, and which connects the hydraulic hose to an oil passage(25) of the spool; first and second piston rods(34,38) which are inserted into the first and second cylinder spaces of the cylinder body, and in which first and second hydraulic pressure spaces are formed; first and second cover nuts(42,44) which are respectively joined with both ends of the first and second cylinder spaces, and of which inner peripheral surfaces are supported to circumferences of the first and second piston rods to guide the operation of the first and second piston rods; first and second spring fixing bolts(50,52) clamped to the cylinder body to pass through both sides of the oil flowing space; first and second finishing bolts(54,55) clamped to the cylinder body to press and support the first and second spring fixing bolts; first and second tension springs(46,48) which are installed in the first and second cylinder spaces of the first and second piston rods, of which one ends of inner sides are fixed to the first and second spring fixing bolts, and of which the other ends of outer sides are fixed to the corresponding other end sides of the first and second cylinder spaces; first and second heads(62,66) which are joined with outer ends of the first and second piston rods, and which have first and second spherical surfaces formed on outer peripheral surfaces thereof; and first and second saddles(74,78) which are joined with the first and second heads, and which have first and second spherical grooves formed on inner peripheral surfaces thereof so that the first and second saddles are freely tilted along the first and second spherical surfaces.

Description

Push jack for welding work

The present invention relates to a push jack for welding, and more particularly, a tilting direction of the first birds and the second birds is free, tilted at a relatively large angle, the first ground of the first birds and the second of the second birds It relates to a push jack for welding operation in which the support surface is stably in close contact with the corresponding contact surface.

In general, in order to build a ship, the necessary iron plate is cut to an appropriate size by an automatic cutting machine according to the design, the cut iron plates are welded one by one to make larger blocks, and these blocks are welded together to make a ship.

In the contrasting step of welding the above-described blocks with each other, while welding to larger blocks, various mechanical equipments such as engines, generators, and pumps, and various design work such as piping, electrical equipment, and cabin interior work are performed at the same time. do.

Since hulls and various facilities of such ships are mostly built by welding work, a separate tool is required for the worker to perform welding work more easily.

However, when the welding site between the steel plate and the iron plate is shifted from each other for the manufacture of ships, the work was very complicated because the welding parts between the iron plate and the iron plate were to be horizontally matched and welded by supporting a separate support wood.

For example, when performing butt welding, if the iron plate and the iron plate do not horizontally coincide with each other, and one iron plate is tilted upward or downward and shifted from each other, the tilted iron plate is pushed up using a separate tool, or After pressing, the welding area between the steel plate and the steel plate should be leveled, and then welding work should be performed.

Since the steel plate for ship manufacturing is relatively thick, a special tool must be used to push or press the iron plate. Special tools such as hydraulic jacks are heavy and impossible to carry. There is a problem that cannot be used.

In order to solve such a conventional problem, the applicant has applied for and registered a push jack for welding work as shown in FIG. 1 (Registration No. 10-613434). The piston rod 1 is inserted into the housing to move forward when the hydraulic pressure is pumped into the housing, and the piston rod 1 which is reversed when the hydraulic oil in the housing is recovered to the hydraulic tank (not shown) is coupled to the end of the piston rod 1. A saddle 3 and a coupling bolt 6 fastened to the saddle 3 and the piston rod 1 are provided.

The female screw portion 2 is formed at the end of the piston rod 1 so that the male screw portion 7 of the coupling bolt 6 is engaged. One side of the saddle 3 is formed with a bolt head hole 4 so that the bolt head of the coupling bolt 6 is seated, and one side of the bolt head hole 4 has a diameter slightly larger than the diameter of the male screw part 7. Through-hole 5 is formed.

Therefore, the through hole 5 of the saddle 3 is larger than the diameter of the male threaded portion 7, so that the saddle 3 is the male threaded portion 7 when the coupling bolt 6 is loosely fastened to the piston rod 1. And little by little in any direction within the gap between and the through-hole 5.

The saddle 3 must be angled in the state in which it is coupled to the piston rod 1 so that the front surface of the saddle 3 is stably supported on the inclined contact surface even when the contact surface of the saddle 3 is formed to be inclined at an angle with respect to the vertical plane.

However, such a conventional push jack for welding, the tilting angle of the saddle (3) is very small, such as 4 to 5 ° so that when the contact surface of the saddle (3) has more inclination with respect to the vertical plane, the outer surface of the saddle (3) is in contact with the contact surface. If not properly supported, when the piston rod (1) is forcibly advanced in this state to press the saddle (3), there is a problem that the excessive shear force is transmitted to the coupling bolt (6) is broken.

In addition, the coupling bolt 6 of the conventional push jack for the welding operation performs the function of fastening the saddle (3) and the piston rod (1), and the function of guiding the tilting of the saddle (3) and limiting the tilt angle. Things did not work properly.

That is, in order to smoothly tilt in the state where the saddle 3 is coupled to the piston rod 1, the coupling bolt 6 needs to be loosened. In this case, the saddle 3 rotates smoothly within a small angle, but the coupling bolt ( As 6) is released, a problem often arises in which the saddle 3 disengages from the piston rod 1. When the coupling bolt 6 is tightened with a larger force to prevent loosening of the coupling bolt 6, the saddle (6) may be caused by a large friction force between the coupling bolt 6, the saddle 3, and the piston rod 1. 3) does not tilt properly.

An object of the present invention for solving the above-mentioned problem is to provide a push jack for welding operation that allows the birds to be tilted smoothly while being coupled to the piston rod.

Another object of the present invention is to provide a push jack for welding operation, which allows the birds to be tilted at a relatively large angle.

The push jack for welding operation of the present invention for achieving the above object, the cylinder body in which the oil access space is formed in the inner center, the first cylinder space and the second cylinder space is formed to be connected to the oil access space on both sides of the inside; ; A spool fastened to the center of the cylinder body and guiding oil supplied from a hydraulic hose to the oil access space; A rotary block rotatably coupled to the spool, the hydraulic hose being coupled to the oil passage of the hydraulic hose and the spool; A first piston rod and a second piston rod inserted into the first cylinder space and the second cylinder space of the cylinder body to move forward or backward along the first hydraulic space and the second hydraulic space; A first fastening coupled to both ends of the first cylinder space and the second cylinder space, respectively, and having an inner circumferential surface supported around the first piston rod and the second piston rod to guide the operation of the first piston rod and the second piston rod; A cover nut and a second cover nut; A first spring fixing bolt and a second spring fixing bolt fastened to the cylinder body to penetrate both sides of the oil access space; A first finishing bolt and a first fastening bolt and a second spring fixing bolt which are fastened to the cylinder body to support the first spring fixing bolt and the second spring fixing bolt to prevent the first spring fixing bolt and the second spring fixing bolt from being released from the cylinder body. 2 dead bolts; It is provided in the first cylinder space of the first piston rod and the second cylinder space of the second piston rod, the inner ends are fixed to the first spring fixing bolt and the second spring fixing bolt, the outer ends of the first cylinder A first tension spring and a second tension spring fixed to corresponding opposite ends of the space and the second cylinder space; First and second heads coupled to outer ends of the first piston rod and the second piston rod and having spherical first and second spherical surfaces formed on outer circumferential surfaces thereof; A first bird and a second bird coupled to the first head and the second head and having a first sphere groove and a second sphere groove formed on an inner circumferential surface to freely tilt along the first sphere and the second sphere. .

According to another aspect of the present invention, there is provided a push jack for welding, wherein the first and second grooves are formed in the first piston rod and the second piston rod, and the first head is opposed to the first groove and the second groove. A first fastening hole and a second fastening hole are formed in the second head, and the first piston rod, the first head, and the second fastening hole are formed in the first fastening hole, the first groove, the second fastening hole, and the second groove. The first bolt and the second bolt are fastened to fasten the piston rod and the second head.

According to another aspect of the present invention, a push jack for welding operation includes a first spring bolt and a second spring bolt fastened to a center of an outer end portion of the first piston rod and the second piston rod, and the first spring bolt and the second spring. A first spring nut and a second spring nut having a first spring groove and a second spring groove are fastened to the bolt so that outer ends of the first tension spring and the second tension spring are coupled to each other.

According to another aspect of the present invention, a push jack for welding may include a first male thread portion and a second male thread portion formed at outer ends of the first piston rod and the second piston rod. The first female screw portion and the second female screw portion are formed to be fastened to the first male screw portion and the second male screw portion.

Another characteristic of the push jack for welding operation of the present invention is to rotate the bundle of the first head and the first birds and the bundle of the second head and the second birds so as to rotate the first male thread portion and the first piston rod of the first piston rod. The first head and the second head are provided with a first rotating hole and a second rotating hole for supporting a rod of the rod to be fastened to the second male threaded portion of the piston rod. Opposing first and second birds are formed with a first through hole and a second through hole.

According to another aspect of the present invention, a push jack for welding may include a plurality of first grooves and second grooves arranged on the first spherical surface of the first head and the second spherical surface of the second head, and the first saddles of the first birds. The first protrusion and the second groove of the old groove and the second bird are detached from the first grooves and the second grooves so that the first birds and the second birds are intermittently angled with respect to the first head and the second head. 2 protrusions are formed.

The present invention as described above, since the first sphere groove of the first birds and the second sphere groove of the second birds is made in surface contact with the first sphere of the first head and the second sphere of the second head, the first birds and the first The tilting direction of the two birds is free and tilted at a relatively large angle compared to the prior art.

This invention, the hydraulic pressure transmitted to the first piston rod and the second piston rod through the first sphere of the first head and the second sphere of the second head the first groove of the first birds and the second of the second birds Evenly distributed throughout the groove. Therefore, the pressing force of the first piston rod and the second piston rod is evenly distributed throughout the first birds and the second birds, thereby preventing the problem of intensively breaking some of the first birds and the second birds, By the pressing force distributed evenly between the two birds, the first ground surface of the first birds and the second ground surface of the second birds are stably in close contact with the corresponding contact surface.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 2 is an external perspective view of the push jack for welding operation of the present invention, Figure 3 is a cross-sectional view of Figure 2, Figure 4 is a partial separation cross-sectional view taken a part of the present invention, Figure 5 is a side view of the use state of the present invention.

The push jack for welding operation of the present invention is provided with a cylinder body 10, a spool 24 coupled thereto, and a rotating block 28 coupled to the spool 24.

The cylinder body 10 has an oil access space 11 formed at an inner center thereof, and the first cylinder space 12 and the second cylinder space 13 connected to the oil access space 11 at both sides thereof. ) Is formed. A spool engaging hole 14 for coupling the spool 24 to be described later is formed above the oil access space 11, and first cover nuts are provided at both ends of the first cylinder space 12 and the second cylinder space 13. The hole 15 and the second cover nut hole 16 are formed. The first screw hole 17 and the second screw hole 18 are formed at both sides of the oil access space 11, and the third screw hole is disposed below the first screw hole 17 and the second screw hole 18. The hole 19 and the fourth screw hole 20 are formed. The outer circumferential surface of the cylinder body 10 is coupled to the handle 22 to carry it.

The spool 24 is coupled to the spool engaging hole 14 of the cylinder body 10 and has an oil passage 25 formed therein, and has a ring-shaped oil so as to be connected to the oil passage 25 around the spool. The groove 26 is formed.

Rotating block 28 is rotatably coupled around the spool 24, the hose connection hole 29 is formed so that the hydraulic hose 32 is coupled, the hydraulic hose 32 and the spool ( Connect the oil passage (25) of 24).

A circumference of the spool 24 is coupled with snap rings 30 to guide the rotating block 28 to rotate about the spool 24 and to prevent it from being separated from the spool 24.

The first piston rod 34 and the second piston rod 38 are coupled to the first cylinder space 12 and the second cylinder space 13 of the above-described cylinder body 10. The first piston rod 34 and the second piston rod 38 are inserted into the first cylinder space 12 and the second cylinder space 13 of the cylinder body 10 to be moved forward or backward along the inside, and The first hydraulic space 35 and the second hydraulic space 39 are formed. At the ends of the first piston rod 34 and the second piston rod 38, end portions of the first bolt 70 and the second bolt 72 to be described later are inserted into the first groove 36 and the second groove ( 40) is formed.

The first cover nut 42 and the second cover nut 44 are formed in the first cover nut hole 15 of the first cylinder space 12 and the second cover nut hole 16 of the second cylinder space 13. Is fastened. The first cover nut 42 and the second cover nut 44 have an inner circumferential surface of the first piston rod 34 and the second piston rod 38 so as to be supported around the first piston rod 34 and the second piston. Guide the operation of the rod 38.

A first tension spring 46 and a second tension spring 48 are provided in the first cylinder space 12 of the first piston rod 34 and the second cylinder space 13 of the second piston rod 38. It is.

The first spring fixing bolt 50 and the second spring fixing bolt 52 are fastened to the first screw hole 17 and the second screw hole 18 of the cylinder body 10, and the first spring fixing bolt 52 is fastened. Corresponding inner ends of the first tension spring 46 and the second tension spring 48 are fixed to the 50 and the second spring fixing bolt 52.

The first closing bolt 54 presses and supports the first spring fixing bolt 50 and the second spring fixing bolt 52 to the third screw hole 19 and the fourth screw hole 20 of the cylinder body 10. And the second closing bolt 55 is fastened to prevent the first spring fixing bolt 50 and the second spring fixing bolt 52 from being released from the cylinder body 10.

The first spring bolt 56 and the second spring bolt 57 are fastened to the centers of the outer ends of the first piston rod 34 and the second piston rod 38, and the first spring bolt 56 and the second spring bolt 57 are fastened to each other. The spring bolt 57 has a first spring nut having a first spring groove 59 and a second spring groove 61 formed therein so that outer ends of the first tension spring 46 and the second tension spring 48 are coupled to each other. (58) and the second spring nut 60 are fastened.

The first head 62 and the second head 66 are coupled to the outer ends of the first piston rod 34 and the second piston rod 38. Inside the first head 62 and the second head 66, the first coupling groove 63 and the second coupling groove (ie, end portions of the first piston rod 34 and the second piston rod 38 are inserted). 67 is formed, and a spherical first spherical surface 65 and a second spherical surface 69 are formed on the outer circumferential surface, and the first fastening is formed so as to face the first groove 36 and the second groove 40 on one side. The hole 64 and the second fastening hole 68 are formed.

In the first fastening hole 64, the first groove 36, the second fastening hole 68, and the second groove 40, the first piston rod 34, the first head 62, and the second piston rod ( The first bolt 70 and the second bolt 72 are fastened to fasten the 38 and the second head 66.

First birds 74 and second birds 78 are coupled to the first head 62 and the second head 66. The first saddle 74 and the second saddle 78 are provided with a first support surface 75 and a second support surface 79 on the outer surface and the first spherical surface 65 and the second spherical surface 69 on the inner circumferential surface. The first sphere groove 76 and the second sphere groove 80 are formed to be tilted freely.

Here, the first birds 74 and the first head 62 and the second birds 78 and the second head 66 are combined as follows. First, the first spherical groove 76 of the first birds 74 and the second spherical groove 80 of the second birds 78 have the same inner diameter and inlet diameter.

Therefore, the first spherical surface 65 of the first head 62 and the second spherical surface 69 of the second head 66 are formed by the first spherical groove 76 and the second saddle 78 of the first saddle 74. It is inserted smoothly into the second sphere groove (80). As such, when the first spherical surface 65 and the second spherical surface 69 are inserted into the first spherical groove 76 and the second spherical groove 80, the periphery of the inlet side of the first spherical groove 76 and the second spherical groove 80 may be reduced. It presses by a press and retracts to the 1st spherical surface 65 and the 2nd spherical surface 69 side.

In the push jack for welding operation of the present invention in this configuration, the hydraulic hose 32 is coupled to the hose connecting hole 29 of the rotary block 28 so that oil is pumped to the cylinder body 10 side. Here, the rotary block 28 is installed so as to rotate 360 ° around the spool 24, so that the hydraulic hose 32 can be connected so that the hydraulic hose 32 is not bent or twisted in any direction.

When oil is pumped to the rotary block 28 through the hydraulic hose 32 in this state, the oil is pumped into the oil entry space 11 of the cylinder body 10 through the oil passage 25 of the spool 24. , The introduced oil flows into the first hydraulic space 35 of the first piston rod 34 and the second hydraulic space 39 of the second piston rod 38, and thus the first piston rod 34 and the second piston. The rod 38 is pressurized to the outside of the cylinder body 10.

Therefore, the first piston rod 34 and the second piston rod 38 are advanced to the outside of the cylinder body 10 and the first tension spring 46 and the second tension spring 48 are extended by their forward lengths. As the first piston rod 34 and the second piston rod 38 move forward, the first ground surface 75 of the first birds 74 and the second ground surface 79 of the second birds 78 correspond to each other. Supported by the contact surface.

Here, as shown in FIG. 5, when the corresponding contact surface supported on the first support surface 75 of the first birds 74 is formed to be inclined, the first birds 74 are tilted while being in contact with them. That is, as the first piston rod 34 moves forward, any part of the first supporting surface 75 of the first birds 74 is first supported on the inclined contact surface. When the first piston rod 34 continues to move in this state, the first spherical groove 76 of the first saddle 74 is tilted with respect to the first spherical surface 65 of the first head 62. When the first piston rod 34 continues to move forward, the entire first support surface 75 of the first saddle 74 is in close contact with the contact surface of the weldment.

This push jack for welding operation of the present invention has the following advantages.

The first spherical surface 65 of the first head 62 and the second spherical surface 69 of the second head 66 have a spherical shape, and the first spherical groove 76 and the second of the first saddle 74 are formed. The second spherical groove 80 of the saddle 78 is in surface contact with the circumference of the first spherical surface 65 of the first head 62 and the second spherical surface 69 of the second head 66. Thus, the first birds 74 and the second birds 78 are tilted freely in either direction. Therefore, compared with the conventional art, the tilting direction is free and the tilting angle is relatively large.

In addition, the hydraulic pressure transmitted to the first piston rod 34 and the second piston rod 38 may cause the first spherical surface 65 of the first head 62 and the second spherical surface 69 of the second head 66 to pass through. Through the first spherical groove 76 of the first birds 74 and the second spherical groove 80 of the second birds 78 is evenly transmitted. Therefore, since the pressing force of the first piston rod 34 and the second piston rod 38 is evenly distributed throughout the first birds 74 and the second birds 78, the first birds 74 and the second birds 78. The problem that part of) breaks down intensively is prevented. And the first supporting surface 75 of the first birds 74 and the second supporting surface 79 of the second birds 78 by the pressing force evenly distributed between the first birds 74 and the second birds 78. It adheres stably to this corresponding contact surface.

6 is a partial cross-sectional view showing another embodiment of the present invention, which includes a first male thread portion 83 and a second male thread portion at outer ends of the first piston rod 82 and the second piston rod 84. 85 is formed, and the first female thread portion 87 and the second head 90 are fastened to the first male thread portion 83 and the second male thread portion 85 on the first head 86 and the second head 90. A female screw portion 91 is formed.

The first head 86 and the second head 90 are formed with a first rotating hole 88 and a second rotating hole 92 for supporting the rotating rod 98, and the first rotating hole 88 and the second rotating hole 98 are formed. A first through hole 95 and a second through hole 97 are formed in the first birds 94 and the second birds 96 opposite to the rotation hole 92.

Therefore, after the rotating rod 98 is inserted into the first rotating hole 88 and the first through hole 95 or the second rotating hole 92 and the second through hole 97, the first head 86 and The first threaded portion 83 and the second piston rod of the first piston rod 82 are rotated by rotating the bundle composed of the first birds 94 or the second head 90 and the second birds 96. 84) to the second male thread portion 85).

This push jack for welding operation of the present invention, compared to Figures 2 to 5 only the coupling structure of the first head 86 and the first piston rod 82 and the second head 90 and the second piston rod 84 Only different, the configuration between the first birds 94, second birds 96 and the first head 86, the second head 90 and the effects and effects thereof are the same as described above.

FIG. 7 is a partial cross-sectional view showing another embodiment of the present invention, wherein the first spherical surface 101 of the first head 100 and the second spherical surface 105 of the second head 104 are formed of a plurality of articles. The first grooves 102 and the second grooves 106 are arranged, and the first grooves 109 of the first birds 108 and the second grooves 113 of the second birds 112 have a first groove ( The first birds 108 and the second birds 112 are intermittently angled with respect to the first head 100 and the second head 104 while being detached from the 102 and second grooves 106. The first protrusion 110 and the second protrusion 114 are formed.

The above-described push jacks for welding work of the present invention, when the first saddle 108 and the second saddle 112 is pressed to be inclined according to the inclination of the contact surface, the first protrusion 110 of the first saddle 108 and As the second protrusion 114 of the second saddle 112 is elastically deformed slightly to the outside thereof, the first grooves 102 of the first head 100 and the second grooves of the second head 104 ( 106) and thus tilt in stages.

In the push jack of the welding operation of the present invention, the first saddle 108 and the second saddle 112 are tilted with respect to the first head 100 and the second head 104 in comparison with FIGS. 2 to 6. The point is different, and the configuration between the first birds 108, the second birds 112 and the first head 100, the second head 104, the resulting action and effects are the same as described above.

1 is a schematic partial cross-sectional view showing a problem of a conventional push jack for welding operation

Figure 2 is an external perspective view of the push jack for welding operation of the present invention

3 is a cross-sectional view of FIG.

4 is a partial separation cross-sectional view of a part of the present invention;

Figure 5 is a side view of the use state of the present invention

6 is a partial cross-sectional view showing another embodiment of the present invention

Figure 7 is a partial cross-sectional view showing another embodiment of the present invention

* Description of the symbols for the main parts of the drawings *

10: cylinder body 11: oil entry space

12: first cylinder space 13: second cylinder space

14: Spool engaging hole 15: First cover nut hole

16: 2nd cover nut hole 17: 1st screw hole

18: 2nd screw hole 19: 3rd screw hole

20: fourth screw hole 22: handle

24: Spool 25: Oil passage

26: oil groove 28: rotary block

29: hose connection hole 30: snap ring

32: hydraulic hose 34,82: first piston rod

35: first hydraulic space 36,102: first groove

38,84: 2nd piston rod 39: 2nd hydraulic space

40,106: 2nd groove 42: 1st cover nut

44: second cover nut 46: first tensile spring

48: 2nd tension spring 50: 1st spring fixed bolt

52: 2nd spring fixing bolt 54: 1st finishing bolt

55: second closing bolt 56: the first spring bolt

57: 2nd spring bolt 58: 1st spring nut

59: first spring groove 60: second spring nut

61: second spring groove 62,86,100: first head

63: first coupling groove 64: first fastening hole

65,101: First spherical surface 66,90,104: Second head

67: second coupling groove 68: second fastening hole

69,105: 2nd spherical surface 70: 1st bolt

72: 2nd bolt 74,94,108: 1st saddle

75: first ground floor 76,109: first district groove

78,96,112: Second Birds 79: Second Ground

80,113: 2nd groove 83: 1st male thread

85: second male thread part 87: first female thread part

88: first rotating hole 91: second female screw portion

92: second rotating hole 95: first through hole

97: second through hole 98: rotating rod

110: first protrusion 114: second protrusion

Claims (6)

An oil entry space 11 is formed at an inner center thereof, and a cylinder body 10 having a first cylinder space 12 and a second cylinder space 13 formed at both sides thereof to be connected to the oil entry space 11. ; A spool 24 fastened to the center of the cylinder body 10 and guiding oil supplied from the hydraulic hose 32 to the oil access space 11; Rotating block 28 is rotatably coupled around the spool 24 and the hydraulic hose 32 is coupled to connect the hydraulic hose 32 and the oil passage 25 of the spool 24; It is inserted into the first cylinder space 12 and the second cylinder space 13 of the cylinder body 10 and is moved forward or backward along the first hydraulic space 35 and the second hydraulic space 39 therein First piston rods 34 and 82 and second piston rods 38 and 84 formed; It is fastened to both ends of the first cylinder space 12 and the second cylinder space 13, respectively, and its inner circumferential surface is supported around the first piston rods 34, 82 and the second piston rods 38, 84. A first cover nut 42 and a second cover nut 44 which guide the operation of the first piston rods 34 and 82 and the second piston rods 38 and 84; A first spring fixing bolt 50 and a second spring fixing bolt 52 fastened to the cylinder body 10 so as to penetrate both sides of the oil access space 11; The first spring fixing bolt 50 is fastened to the cylinder body 10 so that the first spring fixing bolt 50 and the second spring fixing bolt 52 are prevented from being released from the cylinder body 10. A first closing bolt 54 and a second closing bolt 55 for pressing and supporting the second spring fixing bolt 52; It is provided in the first cylinder space 12 of the first piston rods 34, 82 and the second cylinder space 13 of the second piston rods 38, 84, the inner ends are fixed to the first spring The first tension spring 46, which is fixed to the bolt 50 and the second spring fixing bolt 52, and whose outer ends are fixed to corresponding opposite ends of the first cylinder space 12 and the second cylinder space 13, respectively. And a second tension spring 48; Spherical first spherical surfaces 65, 101 and second spherical surfaces 69, which are coupled to the outer ends of the first piston rods 34, 82 and the second piston rods 38, 84, First heads 62, 86, 100 and second heads 66, 90, 104 where 105 is formed; Coupled to the first heads 62, 86, 100, and second heads 66, 90, 104, the first spherical surfaces 65, 101, and second spherical surfaces 69, 105. First saddles 74, 94, 108 and second saddles 78, 96 having first spherical grooves 76, 109 and second spherical grooves 80, 113 formed on the inner circumferential surface to freely tilt along the surface. (112); Push jack for welding operation, characterized in that consisting of. The method of claim 1, A first groove 36 and a second groove 40 are formed in the first piston rod 34 and the second piston rod 38. A first fastening hole 64 and a second fastening hole 68 are formed in the first head 62 and the second head 66 opposite to the first groove 36 and the second groove 40. And The first piston rod 34, the first head 62, and the second hole are formed in the first fastening hole 64, the first groove 36, the second fastening hole 68, and the second groove 40. Push jacks for welding work, characterized in that the first bolt 70 and the second bolt 72 is fastened to fasten the piston rod 38 and the second head (66). The method of claim 1, A first spring bolt 56 and a second spring bolt 57 are fastened to the center of the outer end portions of the first piston rod 34 and the second piston rod 38. The first spring groove 59 and the second spring bolt 57 are coupled to the outer ends of the first tension spring 46 and the second tension spring 48 around the first spring bolt 56 and the second spring bolt 57. Push spring for welding work, characterized in that the first spring nut (58) and the second spring nut (60) is formed with two spring groove (61). The method of claim 1, A first male thread portion 83 and a second male thread portion 85 are formed at outer ends of the first piston rod 82 and the second piston rod 84. A first female thread portion 87 and a second female thread portion 91 are coupled to the first male thread portion 83 and the second male thread portion 85 on the first head 86 and the second head 90. Push jack for welding, characterized in that formed. The method of claim 4, wherein The first number of first piston rods 82 is rotated by rotating the bundle of the first head 86 and the first birds 94 and the bundle of the second head 90 and the second birds 96. First rotation for supporting the rotating rod 98 on the first head 86 and the second head 90 to be fastened to the second male threaded portion 85 of the threaded portion 83 and the second piston rod 84. A hole 88 and a second rotation hole 92 are formed, and the first birds 94 and the second birds 96 facing the first rotation hole 88 and the second rotation hole 92 are formed in the first and second rotation holes 92. Push jack for welding operation, characterized in that the first through hole (95) and the second through hole (97) is formed. The method of claim 1, A plurality of first grooves 102 and second grooves 106 are arranged in the first spherical surface 101 of the first head 100 and the second spherical surface 105 of the second head 104. The first grooves 109 of the first birds 108 and the second grooves 113 of the second birds 112 are attached to and detached from the first grooves 102 and the second grooves 106. The first and second protrusions 110 and 114 are formed such that the first birds 108 and the second birds 112 are intermittently angled with respect to the first head 100 and the second head 104. Push jack for welding, characterized in that.

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