RU2687782C1 - Machine for internal welding of pipes in protective gas - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention can be used for internal welding of pipes in protective gas. Machine comprises front frame (1), centring device (13), rotating disk mechanism (3), welding unit (4), tensioning mechanism (5), middle frame (6), floating spring mechanism (7), drive mechanism (8), rear frame (9), braking mechanism (10), movement mechanism (11) and gas tank (12). Wire feed mechanism (41) is moved from welding unit (4) and is located on front frame (1). Through hole (365) for wire in housing (362) of rotary disc of rotating disk mechanism (3), inner cavity of guide bushing (515) and hollow bushing (51) inner cavity form channel for composite cables (42) from wire feeding mechanism (41) to welding heads (44). Invention provides reduced wear of the composite cable of the welding machine, which increases service life of the welding machine.

EFFECT: machine comprises positioning mechanism of rotating disc, which improves its positioning in axial direction, with provision of more accurate alignment in axial direction and rotation of entire rotating drive system, which improves alignment and quality of welding.

10 cl, 11 dwg

Description

FIELD OF INVENTION

The present invention relates to machines for internal welding and, in particular, to a machine for internal welding of pipes in protective gas.

BACKGROUND INVENTIONS

Machines for internal welding are mainly used in the construction of pipelines in the field of petrochemicals, electric power, coal mining, water supply and the like, and are mainly intended to complete the assembly and internal welding of the root weld of two pipes.

The known internal welding machine shown in FIG. 1 essentially comprises a front frame 1, centering devices 13, a rotating disk 3, a welding unit 4, a tensioning mechanism 5, a middle frame 6, a floating spring mechanism 7, a driving mechanism 8, a rear frame 9, the brake mechanism 10 and the gas reservoir 12. This machine can provide a good result and is progressive, but still has many design flaws in practical use and, therefore, does not allow to achieve the optimal result in practical application, The disadvantages are as follows:

1. First, the cables and gas pipes are easily damaged. Since the welding unit is located between two rows of tensioning units of the tensioning mechanism, protective gas pipes and cables connected to the welding unit are distributed on the outer side surface of the tensioning mechanism, and the welding unit rotates around the machine axis during operation, friction between the cables easily forms and gas pipes and a tensioning mechanism, and between gas pipes and a tensioning mechanism, which leads to damage to the cables and gas pipes. Cables often need replacing, and it is expensive.

2. Secondly, inconvenient maintenance. The welding unit contains welding heads, wire feeder, support mechanisms for welding heads, adjustment mechanisms for welding heads and others, and the mechanisms are relatively complex, due to which the welding unit is large. Since the distance between the two rows of tensioning blocks of the tensioning mechanism is limited, when the welding unit fails, maintenance is difficult, maintenance time increases, and this affects the design efficiency.

3. Thirdly, the positioning base is not accurate. A rotating disc is an important part of an automatic internal welding machine, and even the most important part, without which the internal welding machine cannot perform welding. The rotating disk is located between two rows of tensioning units of the tensioning mechanism. The welding unit is evenly fixed on the outer circumference of the rotating disk. The gear connected to the rotating motor interacts with the internal gear crown of the rotating disk, which allows the rotating disk to rotate in the rotating disk mechanism around the axis of the machine. In a traditional internal welding machine, the rotating motor is fixed in the middle frame and is connected to the gear through the clutch. The inaccuracy of the positioning base results in insufficiently good coaxiality of the rotating engine and gear, so the clutch is easily damaged and this affects the design efficiency.

4. It should be noted that the rotating disk is not well positioned in the axial direction. The welding unit is mounted on the outer circumference of the rotating disk, while the relative positions of the welding heads in the welding unit are precisely set relative to the edges of the two welded pipes, and the relative positions of the rotating disk and the welded edges of the pipes should be matched during rotation. However, the rotating disk in the rotating mechanism of the traditional machine for internal welding is not well positioned in the axial direction, which affects the quality of welding and design efficiency. The disadvantages of the known machine for internal welding are successfully eliminated in the proposed structurally new machine for internal welding of pipes in protective gas to ensure better feasibility.

SUMMARY OF INVENTION

One of the purposes of the present invention is to eliminate the disadvantages of the known machine for internal welding and to create a constructively new machine for internal welding of pipes in protective gas. The technical challenge that needs to be addressed is to eliminate light cable wear, extend cable life and reduce cost, and improve feasibility.

Another objective of the present invention is to create a machine for the internal welding of pipes in protective gas. The technical problem to be solved is to reduce the space between the two rows of tensioning blocks of the tensioning mechanism, which will simplify maintenance, reduce maintenance time and improve the efficiency and feasibility of the design.

Another objective of the present invention is to create a machine for the internal welding of pipes in protective gas. The technical problem to be solved is to achieve a high accuracy of the positioning base, which will ensure the alignment of the rotating engine and gear, avoid light damage to parts, increase design efficiency, extend service life and reduce cost, improve feasibility.

Another objective of the present invention is to create a machine for the internal welding of pipes in protective gas. The technical problem to be solved is to provide a more accurate axial positioning of the rotating disk, which will improve the welding efficiency and design, improve the feasibility and allow to achieve the level of industrial applications.

Another objective of the present invention is to create a machine for the internal welding of pipes in protective gas. The technical problem to be solved consists in precisely centering the two welded edges of the pipe joint during welding in such a way as to improve the quality of welding.

The objectives of the present invention and the technical tasks to be solved are achieved and solved by the following technical solution. The internal gas welding machine for shielding gas contains a front frame, centering devices, a rotating disk mechanism, a welding unit, a tension mechanism, a middle frame, a floating spring mechanism, a drive mechanism, a rear frame, a brake mechanism, a machine movement mechanism, and a gas reservoir to ensure operation. pneumatic machine elements. The control system and centering devices are installed in the front frame. A floating spring mechanism is installed between the middle frame and the rear frame. The drive mechanism, the brake mechanism and the movement mechanism are mounted in series on the rear frame. One side of the tensioning mechanism is mounted on the front frame, and the other side of the tensioning mechanism is mounted on the middle frame. One side of the floating spring mechanism is connected to the middle frame, and the other side of the floating spring mechanism is connected to the rear frame. The gas tank is connected to the rear frame. The welding unit and the rotating disk mechanism are located in the tensioning mechanism. The welding unit contains a wire feeder, composite cables, welding head blocks, welding heads, welding head adjustment mechanisms, and lifting cylinders of welding heads. The wire feeder is moved from the welding unit and is located in the front frame. The welding head blocks are located on the casing of the rotating disk mechanism. Each welding head block contains a welding head, a welding head adjustment mechanism and a lifting cylinder of the welding head. The wire feeder is connected to the welding head with a composite cable, and the welding head is connected to one end of the welding head adjustment mechanism.

In a machine for internal welding of pipes in shielding gas, three groups of centering devices are located on the front frame. Each centering device contains a cylinder support, a centering cylinder, a connecting rod, a positioning unit, a rear thrust head positioning the base plate and a front thrust head, with one end of the cylinder support mounted on the front frame, and the other end of the cylinder support is connected to one end of the centering cylinder devices. The other end of the cylinder of the centering device is connected to the positioning unit. The connecting rod is connected to the positioning unit. The front thrust head is located on the front upper end surface of the positioning unit, the rear thrust head is located on the rear lower end surface of the positioning unit. When the cylinder of the centering device is held, the outer surface of the rear thrust head contacts the surface of the positioning base plate, so that the three rear thrust heads are located in the same plane, and the three front thrust heads are aligned with the plane where all welding heads with ensuring the alignment of the welding heads with the welded edges of the joint of the pipes during their rotation together with the mechanism of the rotating disk during welding.

In a machine for internal welding of pipes in protective gas, the tensioning mechanism contains two identical symmetrical structures. One tensioner design contains a hollow bushing, a first lock nut, a cylinder bottom, a cylinder drum, a piston, a piston rod, a second lock nut, a first cylinder cover, a second cylinder cover, an articulated support, a connecting rod, a distribution plate, a pushrod rod, a tension block, and guide sleeve. The bottom of the cylinder is connected to the cylinder drum, the cylinder drum is connected to the first cylinder cover, and the first cylinder cover is connected to the second cylinder cover to form an internal cavity of the tensioning mechanism. The guide bushing is located in the middle of the internal cavity and has a hollow structure. One end of the guide sleeve is fixed at one end of the hollow sleeve in the direction of the transverse axis, the other end of the hollow sleeve is fixed at the bottom of the cylinder using the first lock nut so that the internal cavity of the hollow sleeve communicates with the internal cavity of the guide sleeve, and the external circumference of the hollow sleeve and external side the surface of the guide sleeve provides axial sliding and support for the piston rod. One end of the piston rod, located on the outer side surfaces of the hollow sleeve and the guide sleeve, is connected to one end of the connecting rod by means of an articulated support. The other end of the connecting rod is connected to the lower end of the pusher rod. The tensioning unit is located at the upper end of the pusher rod. The other end of the piston rod is connected to the piston using a second lock nut, and the piston rod is displaceable in the axial direction along with the piston. The distribution plate is located between the second cylinder cover and the guide sleeve. The pusher rod is mounted to move up and down in the radial opening of the distribution plate, and the gas inlet holes are made in the cylindrical drum of the cylinder.

In the machine for internal welding of pipes in protective gas, the guide sleeve contains a sleeve, two connecting discs and connecting ribbed plates. Two connecting disks are located on two symmetrical sides of the vertical axis. The sleeve in the direction of the transverse axis is connected to two coupling discs to form an integrated structure, and the connecting ribbed plates are located between the two coupling discs.

In a machine for internal welding of pipes in protective gas, the rotating disk mechanism contains a rotating disk rotating drive system, a rotating disk and rotating disk positioning mechanisms. The rotating disk is located between the distribution plates on both sides, located coaxially with the distribution plates, and is located on the radially outer side of the connecting disk. The positioning mechanisms of the rotating disk are installed on the distribution plates, and the system for driving the rotation of the rotating disk is connected to the distribution plates.

In a machine for internal welding of pipes in protective gas, the rotating disk drive system contains a rotating motor, a fixed block, a fixing screw, a bearing, a thrust plate, a gear, a key and a transfer shaft, with the fixed block fixed on the distribution plate of the tensioning mechanism and, therefore, has a high-precision base positioning. A rotating motor is connected to one end of the transmission shaft with a key. The transmission shaft is held in the round hole of the distribution plate with a bearing, and the other end of the transmission shaft is connected to the gear with a bolt and anvil plate, which ensures the coaxiality of the entire rotational drive system and the rotational accuracy of the rotating disk.

In a machine for internal welding of pipes in protective gas, the rotating disk is split and contains an internal gear rim, a rotating disk body, a positioning connecting bolt, a connecting plate and threaded holes. The body of the rotating disk has a composite structure and contains at least two arc bodies. These at least two arc bodies are fixedly connected by means of a connecting plate and a positioning connecting bolt to form an integrated rotating disk housing. The inner ring gear is located on the inner circumference of the rotating disk housing and meshes with the gear wheel of the rotating disk drive system, and the internal gear ring and welding head blocks are attached to the rotating disk housing of the rotating disk mechanism. The rotating disk housing has threaded holes in the mounting points of the welding head blocks so that the threaded holes in the rotating disk housing, the internal cavity of the guide sleeve and the internal cavity of the hollow sleeve form a channel for the composite cables from the wire feeder to the welding heads.

In the machine for internal welding of pipes in protective gas, the positioning mechanisms of the rotating disk contain first rollers, first supports, first positioning wheels, positioning bearings, second positioning wheels, second supports, guide blocks, springs and control sleeves, and the positioning bearings are mounted on the tensioning plate mechanism using the first rollers. The positioning bearings are evenly distributed on one circumference of the distribution plate, and the outer circumferences of the positioning bearings are in contact with the inner circumference of the rotating disk to ensure radial positioning. The first supports are installed on the distribution plate of the tensioning mechanism. Each first positioning wheel is fixed on the corresponding first support, and the outer circumference of each positioning wheel is in contact with the side surface of the rotating disk with axial positioning. The guide blocks are mounted on the tensioning plate of the tensioning mechanism, and each of the second supports is connected to each of the guide blocks, and the second supports are moved in the axial direction by means of the guide blocks. Each of the second positioning wheels is fixed on each corresponding second support. The spring is located on the guide block. The regulating sleeve is located at the outer end of the guide block. The second positioning wheel has the possibility of pressing it with the outer circumference of the side surface of the rotating disk with the help of a spring and an adjusting sleeve to perform axial compression, and the adjusting sleeve and the guide block are adapted to change the compressive force of the spring by adjusting their relative positions.

In the machine for internal welding of pipes in a protective gas between the hollow bushing and the piston rod are located the sealing ring for sealing the cavity and the guide ring. In the machine for internal welding of pipes in protective gas between the rear thrust heads and positioning base plates and between the front thrust heads and welded edges of the pipe butt joint, sensory devices are installed. Six corresponding indicator devices are placed with the possibility of determining during the operation of centering the presence of contact between the surfaces of the rear stop heads with the positioning base plates, and the front stop heads - with the welded edges of the pipe butt.

Compared with the prior art, the present invention has obvious advantages and positive effects. The present invention at least has the following advantages:

1. The wire feeder in the welding unit is moved to the front frame, so that the welding unit is simplified, the dimensions of the welding head units are reduced, the failure rate of the internal welding machine is maximally reduced, and in case of a failure, repairs can be made quickly and conveniently, which reduces maintenance costs.

2. The wire feeder in the welding unit is moved to the front frame, and the guide sleeve is located in the internal cavity of the tensioning mechanism. The body of the rotating disk is composite and has threaded holes, so that the composite cables are arranged in an orderly and proper manner, and are connected to the welding heads of blocks of welding heads. So, the internal cavity of the guide sleeve, the internal cavity of a hollow sleeve connected to the guide sleeve, and the threaded holes in the rotating disk housing form a channel for composite cables from the wire feed mechanism 41 to the welding heads 44, which eliminates friction caused by welding cables, pipes for protective gas and other mechanisms, and prolongs the life of composite cables. In addition, composite cables can be quickly and conveniently disconnected and installed and improved design efficiency.

3. The overall dimensions of the welding head blocks are reduced, the distance between the two rows of tension blocks is reduced, the function of controlling the circumference of the edges of the pipe joints of the machine for internal welding is improved, the edges of the pipe joints are better fitted to each other and the welding quality is improved.

4. Due to the use of rotating disk positioning systems, the axial positioning of the rotating disk mechanism is improved and the welding quality is improved.

5. Due to the improved method of connecting the rotating disk drive motor, the alignment of the entire rotation drive system is ensured, the rotational disk rotational accuracy is ensured, and the welding quality is improved.

6. Due to the use of centering devices, the welded edges of the junction of two pipes are centered during welding more accurately, which ensures the quality of welding.

The above is only the essence of the technical solution of the present invention. To understand the technical means of the present invention more clearly, the essence of the invention can be realized according to the content of the description.

In addition, in order that the above and other objectives, properties and advantages of the present invention become more obvious and easy to understand, the preferred options will be described in detail later with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the present description:

Figure 1 is a schematic drawing of a general structural view of a known internal welding machine.

Figure 2 is a schematic drawing of a general structural view of the proposed machine.

Figure 3 is a structural schematic drawing of the welding unit of the proposed machine.

Figure 4 is a structural schematic drawing of the welding unit of the proposed machine.

Figure 5 is a structural schematic drawing of the tensioning mechanism of the proposed machine.

Figa is a structural view in section of the hollow sleeve of the proposed machine.

Fig.6B is a schematic side view of the hollow sleeve of the proposed machine.

Fig.7 is a structural schematic drawing of the mechanism of the rotating disk of the proposed machine.

8 is a structural schematic drawing of a rotating disk drive drive system of the proposed machine.

Figa is a structural schematic drawing of a rotating disk of the proposed machine.

FIG. 9B is a sectional view along A-A in FIG. 9A.

FIG. 9C is a schematic drawing of an enlarged portion of the structure shown in FIG. 9A.

Figure 10 is a structural schematic drawing of the positioning mechanism of the rotating disk of the proposed machine.

11 is a structural schematic drawing of the centering device of the proposed machine.

In the drawings:

1: front frame positioning mechanism

2: control system

3: rotating disk mechanism

32: rotating disk drive system

321: rotating engine

322: fixed block

323: fixing screw

324: bearing

325: thrust plate

 326: gear

327: key

328: gear shaft

36: rotating disc

361: internal gear ring

362: rotating disk enclosure

363: positioning connecting bolt

364: connecting plate

365: threaded hole

37: rotating disk positioning mechanism

371: first video

372: the first pillar

373: first positioning wheel

374: positioning bearing

375: second positioning wheel

376: the second pillar

377: guide block

378: spring

379: regulating sleeve

4: welding unit

41: wire feeder

42: composite cable

43: welding head assembly

44: welding head

45: welding head adjustment mechanism

46: lifting cylinder welding head

5: tensioning mechanism

51: hollow sleeve

52: first lock nut

53: cylinder bottom

54: piston

55: piston rod

56: second lock nut

57: first cylinder cap

58: second cylinder cover

59: articulated support

510: connecting rod

512: distribution plate

513: pusher rod

514: tension block

515: guide sleeve

515a: sleeve

515b: coupling disc

515c: connecting ribbed plate

516: first gas inlet port

517: second inlet gas inlet

6: middle frame

7: floating spring mechanism

8: drive mechanism

9: rear frame

10: brake mechanism

11: the movement mechanism of the machine

12: gas tank

13: centering device

131: cylinder support

132: centering cylinder

133: connecting rod

134: positioning unit

135: rear thrust head

136: positioning base plate

137: front thrust head

14: first welded pipe

15: second welded pipe

16: welded pipe butt edges

 DETAILED DESCRIPTION OF THE INVENTION

In order to better understand the technical means and effects used to achieve the objectives of the present invention, specific embodiments, structures, features and properties of a machine for the internal welding of pipes in a protective gas according to the present invention will be further described in more detail together with the attached drawings and preferred options.

Figure 2 illustrates a machine for internal welding of pipes in protective gas, in a preferred embodiment of the present invention, essentially comprising a front frame 1, centering devices 13, a rotating disk mechanism 3, a welding unit 4, a tension mechanism 5, a middle frame 6, a floating spring mechanism 7 , the drive mechanism 8, the rear frame 9, the brake mechanism 10, the movement mechanism 11 and the gas reservoir 12. The front frame 1 has a control system 2 and centering devices 13. A floating spring mechanism 7 is installed between the middle frame oh 6 and the rear frame 9. The drive mechanism 8, the brake mechanism 10 and the movement mechanism 11 are sequentially mounted on the rear frame 9. One side of the tension mechanism 5 is mounted on the front frame 1, and the other side of the tension mechanism 5 is mounted on the middle frame 6. One side floating spring mechanism 7 is connected to the rear frame 9. The gas tank 12 is connected to the rear frame 9. The welding unit 4 and the mechanism of the rotating disk 3 are located in the tensioning mechanism 5.

3 and 4 illustrate a welding unit 4 comprising a wire feeding mechanism 41, composite cables 42, welding head blocks 43, welding heads 44, welding head adjustment mechanisms 45, and lifting cylinders 46 of the welding heads. The mechanism 41 of the wire is removed from the welding unit 4 and installed in the front frame 1. The blocks 43 of the welding heads are located on the housing of the mechanism 3 of the rotating disk. In this embodiment, six composite cables 42, six blocks 43 of welding heads, six welding heads 44, six mechanisms 45 for adjusting the welding heads and six lifting cylinders 46 of the welding heads are provided. Each block 43 of the welding head contains a welding head 44, a mechanism 45 for adjusting the welding head and a lifting cylinder 46 of the welding head. The wire feeder 41 is connected to the welding head 44 with a composite cable 42. The welding head 44 is connected to one end of the welding head adjustment mechanism 45, and the other end of the welding head adjustment mechanism 45 is connected to the welding head unit 43. Due to the fact that the wire feed mechanism 41 is removed from the welding unit 4, the friction between the composite cables 42 and the tension blocks 514 and the pusher rods 513 of the tension mechanism 5 is eliminated, which extends the service life of the composite cables 42, and also simplifies the design of the welding block, reduces the likelihood of failures , reduces the overall dimensions of the welding unit 4, reduces the distance between the two rows of tensioning blocks, and improves the execution of the control circle and the fit of the edges of the joint of the first and second welded pipes 14, 15.

11 illustrates three groups of centering devices 13 located on the front frame 1. Each centering device 13 includes a cylinder support 131, a centering cylinder 132, a connecting rod 133, a positioning unit 134, a rear thrust head 135, a positioning base plate 136 and a front thrust a head 137. One end of the cylinder support 131 is mounted on the front frame 1, and the other end of the cylinder support 131 is connected to one end of the cylinder 132 of the centering device. The other end of the centering cylinder 132 is connected to the positioning unit 134. The connecting rod 133 is connected to the positioning unit 134, and the front thrust head 137 is located on the front upper end surface of the positioning unit 134. The rear thrust head 135 is located on the rear lower end surface of the positioning unit 134, and the positioning base plate 136 is in contact with the outer surface of the first thrust head 135.

When the three cylinders 132 of the centering device respectively hold the three rear stop heads 135 in contact with the positioning base plates 136, the three rear stop heads are located in the same plane, and the three front stop heads 137 are aligned with the plane where all the welding heads 44, thereby ensuring the alignment of the welding heads 44 with the welded edges 16 of the pipe butt joint when rotating together with the rotating disk 36 during welding. In practical use, the front frame 1 of the internal welding machine and the front half of the tensioning mechanism 5 first exit the second weldable pipe 15 in order to hold the cylinders 132 of the centering device so that the surfaces of the three rear stop heads 135 respectively match the three corresponding positioning base plates 136. When starting the drive mechanism 8, the internal welding machine moves back in the pipes to be welded until the three front stop heads 137 are in contact with the welded pipes. omkov 16 joint pipe. At this point, the surfaces of the three rear stop heads 135 are aligned with the positioning base plates 136, and the three front stop heads 137 are in contact with the welded edges 16 of the pipe seams. Quickly fasten the tension blocks 514 of the tension mechanism 5 in the second pipe 15 to be welded so that they hold firmly on the inner wall of the pipe, and loosen the drive mechanism 8 and the cylinders 132 of the centering device to complete the centering. However, the surrounding structures at the site of operation are relatively complex, the surfaces of the three rear stop heads 135 are not in contact with one or more positioning base plates, or the three front stop heads 137 are not in contact with one or more of the welded edges 16 of the butt joints during centering, but the centering operation finished, which can directly affect the quality of welding.

To avoid the above problem, between the three front stop heads 135 and the positioning base plates 136, and between the three front stop heads 137 and the welded edges 16 of the pipe joint, sensory devices are installed. When during centering the surfaces of the three rear stop heads 135 are in contact with the positioning plates 136, and the three front stop heads 137 are in contact with the welded edges 16 of the pipe butt, the corresponding six indicator devices determine the presence of contact. As soon as the contact point is located, the indicator device signals the operator where the contact is missing and reminds the operator to check, which ensures an effective quality of centering and quality of welding.

5, the tensioning mechanism 5 comprises two identical symmetrical structures. One design of the tensioning mechanism 5 comprises a hollow bushing 51, a first lock nut 52, a cylinder bottom 53, a cylinder drum, a piston 54, a piston rod 55, a second lock nut 56, a first cylinder cover 57, a second cylinder cover 58, an articulated support 59, a connecting rod 510, a distributor plate 512, a pusher rod 513, a tension block 514 and a guide sleeve 515. The bottom 53 of the cylinder is connected to the cylinder drum. The cylinder drum is connected to the first cylinder cover 57, and the first cylinder cover 57 is connected to the second cylinder cover 58, which together forms the internal cavity of the tensioning mechanism 5. The guide sleeve 515 is located in the middle of the internal cavity and has a hollow structure. One end of the guide sleeve 515 is fixed at one end of the hollow sleeve 51 in the transverse direction, and the other end of the hollow sleeve 51 is fixed to the bottom 53 of the cylinder using the first lock nut 52, providing communication of the internal cavity of the hollow sleeve 51 with the internal cavity of the guide sleeve 515. External circumference the hollow sleeve 51 and the outer side surface of the guide sleeve 515 provide axial sliding and support for the piston rod 55. One end of the piston rod 55 located on the outer side surfaces of the hollow sleeve 51 and the guide sleeve 515 is connected to one end of the connecting rod 510 by means of an articulated support 59. The other end of the connecting rod 510 is connected to the lower end of the pusher rod 513. The tensioner block 514 is located at the upper end of the pusher rod 513. The other end of the piston rod 55 is connected to the piston 54 by a second lock nut 56, and the piston rod 55 can move axially along with the piston 54. The distribution plate 512 is located between the second cylinder cover 58 and the guide sleeve 515, and the push rod 513 can move up and down in the radial hole in the distribution plate 512. Gas inlet holes are made in the cylinder drum. In this embodiment, a first gas inlet 516 and a second gas inlet 517 are provided. Between the hollow bushing 51 and the piston rod 55, there is a sealing ring for sealing the cavity and a guide ring.

To ensure the successful connection of the composite cable 42 to the welding head unit 43, when gas enters the first gas inlet 516, the piston 54 moves under pressure in the hollow sleeve 51. The piston 54 is connected to the piston rod 55 and the piston rod 55 is driven in axial direction. direction, and then the tensioning mechanism 5 is set in motion. The piston 54 stops moving when the lower surface of the piston 54 contacts the first cylinder cover 57 and the tensioning mechanism 5 approaches the highest point. When the gas enters the second inlet 517 of the gas inlet, the piston 54 under the action of pressure will move in the hollow sleeve 51, and the tension device 5 moves in the opposite direction. The piston 54 stops moving when the lower surface of the piston 54 is in contact with the bottom 53 of the cylinder, and the tensioning mechanism 5 has reached the lowest point. In addition, the present invention can extend the service life of gas pipes and composite cables 42.

6A and 6B, the guide bushing 515 has a hollow structure and comprises a sleeve 515a, two connecting disks 515b and connecting ribbed plates 515c. Two connecting discs 515b have a disk structure and, accordingly, are located on two symmetrical sides of the vertical axis. The sleeve 515a in the transverse axial direction is connected with two connecting disks 515b with the formation of an integrated structure. The connecting ribbed plates 515c are located between two connecting disks 515b. The hollow structure of the internal welding bushes 515 of the internal welding machine can ensure the normal passage of more than two groups of composite cables, and the maximum reduction of friction between the composite cables 42 and other elements, so that the service lives of the composite cables 42 increase. Since the connecting structure of more than two connecting finned plates 515c is located in the middle of the guide sleeve 515, more than two groups of gas pipes and composite cables 42 can normally pass, and the groups of gas pipes and composite cables 42 successfully join welding heads 44.

7, the rotating disk mechanism 3 comprises a rotating disk rotation drive system 32, a rotating disk 36, and a rotating disk positioning mechanism 37. Rotating disk 36 is located between the distribution plates 512 on both sides, located coaxially with the distribution plates 512, and is located on the radially outer side of the connecting disk 515b. The rotating disk positioning mechanisms 37 are mounted on distribution plates 512, and a rotating disk rotation drive system 32 is connected to distribution plates 512. In this embodiment, nine groups of rotating disk positioning mechanisms are provided.

8, the rotating disk drive system 32 comprises a rotating motor 321, a fixed block 322, a mounting screw 323, a bearing 324, an abutment plate 325, a gear 32, a key 327 and a transmission shaft 328, with the fixed block 322 mounted on the distribution plate 512 of the tensioning mechanism 5 using a mounting screw 323, which provides a highly accurate positioning base. The rotating motor 321 is connected to one end of the transmission shaft 328 via a key 327. The transmission shaft 328 is held in a circular opening of the distribution plate 512 with a bearing 324. The other end of the transmission shaft 328 is connected to gear 326 by means of a bolt and anvil plate 325, ensuring coaxiality of the whole rotation drive system 32 and rotational disk rotation accuracy 36. The fixed unit 322 is mounted on a distribution plate 512 of the tensioning mechanism 5. Bearing 324 is fixed in the hole of the distribution plate 512, and The fixed surface of the fixed block 322 is perpendicular to the mounting hole of the bearing 324, thus ensuring the alignment of the rotating motor 321 mounted on the fixed block 322 and the distribution plate 512. The rotating motor 321 drives the gear shaft 328 by means of a key 327. The gear shaft 328 leads during the rotation of the gear 326. Gear 326 interacts with the internal gear crown 361 of the rotating disk 36 and causes the rotating disk 36 to rotate. In this process, the connections of the rotating engine To 321 with the pinion 326 are straight, so that the encoder coupled to the rotating motor 321 may reflect the angle of rotation of the rotary disc 36 to more accurately, and the welding quality is improved.

On figa. 9B and 9C of the rotating disk 36 is composite and includes an internal gear rim 361, a rotating disk housing 362, a positioning connecting bolt 363, a connecting plate 364 and threaded holes 365, the rotating disk housing 362 having a composite structure and containing at least two arc the bodies, and at least two arc bodies are fixedly connected by a connecting plate 364 and a connecting positioning bolt 363 with the formation of an integrated rotary disk housing 362. The internal gear 361 is located on the outer circumference of the housing 362 of the rotating disk. The internal gear 361 communicates with the gear 326 of the system 32 of the drive of the rotating disk. The inner ring gear 361 and the blocks 43 of the welding heads are fixed on the housing 362 of the rotating disk of the mechanism 3 of the rotating disk. The rotating disk housing 362 has three threaded holes 365 at the mounting points of the welding head blocks 43, so that the threaded holes 365 in the rotating disk housing 362, the internal cavity of the guide sleeve 515 and the internal cavity of the hollow sleeve 51 form a channel for the composite cables 42 and gas pipes from the mechanism 41 wire feed to the welding heads 44. The main function of the rotating disk 36 is to mount and bring into rotation the blocks 43 of the welding heads. The rotating disk 36 has an integral structure that facilitates installation, maintenance and repair. Parts in the tensioning mechanism 5 do not need to be removed. The positioning connecting bolt 363 is loosened directly, and the connecting plate 364 is removed, which is very convenient and effective.

10, the positioning mechanisms 37 of the rotating disk comprise first rollers 371, first bearings 372, first positioning wheels 373, positioning bearings 374, second positioning wheels 375, second bearings 376, guide blocks 377, springs 378 and adjusting bushings 379. Positioning bearings 374 mounted on the distribution plate 512 of the tensioning mechanism 5 using the first rollers 371. Positioning bearings 374 are evenly distributed on the same circumference of the distribution plate 512. The outer circumferences of the positioning subshirts Picks 374 are in contact with the inner circumference of the rotating disk 3, which provides radial positioning of the disk. The first supports 372 are fixed on the distribution plate 512 of the tensioning mechanism 5. Each first positioning wheel 375 is fixed on the corresponding first support 372. The outer circumference of each positioning wheel 375 contacts the side surface of the rotating disk 36, thus providing axial positioning. The guide blocks 377 are mounted on a distributor plate 512 of the tensioning mechanism 5. Each second support 376 is connected to each guide block 377. The second supports 376 move axially along the guide blocks 377. Each second positioning wheel 375 is mounted on each corresponding second support 376. Spring 378 located on the guide block 377. The adjusting sleeve 379 is located on the outer end of the guide block 377. The outer circumference of the second positioning wheel 375 can press the side surface of the rotating claim 36, by a spring 378 and control sleeve 379 to ensure axial compression. The compressive force of the spring 378 can be changed by adjusting the relative positions of the adjusting sleeve 379 and the guide block 377. In this embodiment, there are nine first rollers 371, nine first bearings 372, nine first positioning wheels 373, nine positioning bearings 374, nine second positioning wheels 375, nine second supports 376, nine guide blocks 377, nine springs 378, and nine control sleeves 379.

The main function of the rotating disk positioning mechanism 37 is to provide a relative position between the rotating disk 36 and the distribution plate 512, i.e., providing axial and radial positioning of the rotating disk 36. The outer circumferences of the positioning bearings 374 are in contact with the inner circumference of the rotating disc 36, and the positioning bearings 374 are evenly distributed on the same circumference of the distribution plate 512 using the first rollers 371, thus ensuring alignment of the and a distribution plate 512, and realizing the radial positioning of the rotating disk 36. The outer circumference of each positioning wheel 375 is in contact with the side surface of the rotating disk 36, and the distance between each positioning wheel 375 and distribution plate 512 is appropriate, thus ensuring the parallelism of the rotating disk 36 and the distribution plate 512 and carrying out the axial positioning of the rotating disk 36. The guide blocks 377 are fixed on the distribution tionary plate 512 and second bearing 376 can slide in the axial direction in the guide blocks 377. The control sleeve 379 are connected to guide blocks 377 by means of threads. The pre-compression force of the springs 378 installed between the adjusting sleeves 379 and the second supports 376 is modified by adjusting the distances between the adjusting sleeves 379 and the guide blocks 377, so that the second supports 376 drive the second positioning wheels 375 to compress the side surface of the rotating disk 36, which provides axial compression of the rotating disk 36.

The front frame 1, the middle frame 6 and the rear frame 9 of the internal welding machine are mainly used to fasten other mechanisms and to protect other mechanisms that form the main body of the internal welding machine. The control system is mainly used for the operator to perform all operations on the welding machine. The centering devices 13 are used to realize the function of centering the machine for internal welding, thus ensuring that the welding heads 44 are placed in the same plane as the welded edges 16 of the pipe butt when rotating together with the rotating disk 36. The welding unit is mainly used for welding two weldable edges 16 of the pipe joint. Two rows of tensioning blocks 514 of the tensioning mechanism 5, respectively located in the first welded pipe 14 and in the second welded pipe 15, can ensure the alignment of the two welded pipes when the tensioning mechanism 5 is taut and can be used to control the circumference at the joint edges of the welded pipes, thus ensuring a constant distance between the welding heads 44 and the welded edges 16 of the pipe butt, and ensuring the quality of welding. The floating spring mechanism 7 is mainly used for the elastic connection of the middle frame 6 to the rear frame 9, thus providing the maximum reduction in the degree of freedom of the tension mechanism 5 in the process of centering the centering devices 13, and ensuring the quality of centering. And the floating spring mechanism 7 can ensure the passage of automatic welding while moving in curved pipelines. The drive mechanism 8 is mainly used to supply energy in the forward or reverse direction for automatic welding. The brake mechanism 10 is an important measure for ensuring structural safety. The internal welding machine having the described construction uses the locking of the drive mechanism 8 and the brake mechanism 10, i.e. the braking is synchronously switched off when the drive mechanism 8 sets the machine for internal welding in motion in the forward or reverse direction, and the brake mechanism 10 is automatically driven to action when the welding machine for internal welding stops moving, so that the brake plate is securely attached to the inner walls of the pipes to prevent the welding machine from slipping and ensure the safety of the structure at the site. The movement mechanism 11 is mainly used to support a machine for internal welding in pipelines while moving a welding machine for internal welding. Gas tank 12 is mainly used to provide a source of gas for a machine with internal welding at the right time, ensuring the normal operation of each pneumatic element on the machine for internal welding.

The above are only preferred embodiments of the present invention, but it is not limited to them in any way. The present invention is discussed above with preferred options that are not used to limit it. Any person skilled in the art can make some changes or modifications using the technical content described above to obtain equivalent variations of equivalent changes, within the technical solutions of the present invention. Any simple variation and equivalent change and modification made with respect to the above options, according to the technical nature, without deviating from the content of the technical solution of the present invention, will be within the technical solution of the invention.

Claims (10)

1. Machine for internal welding of pipes in protective gas, containing a front frame (1), centering devices (13), a rotating disk mechanism (3), a welding unit (4), a tension mechanism (5), a middle frame (6), a floating spring mechanism (7), drive mechanism (8), rear frame (9), brake mechanism (10), machine movement mechanism (11) and gas reservoir (12) for ensuring operation of the pneumatic machine elements, while controlling system (2) and centering devices (13) are mounted on the front frame (1), a floating spring mechanism (7) is installed between the cf. The single frame (6) and the rear frame (9), the drive mechanism (8), the brake mechanism (10) and the movement mechanism (11) are sequentially mounted on the rear frame (9), one side of the tension mechanism (5) is installed on the front frame ( 1), the other side of the tensioning mechanism (5) is mounted on the middle frame (6), one side of the floating spring mechanism (7) is connected to the middle frame (6), the other side of the floating spring mechanism (7) is connected to the rear frame (9), the gas tank (12) is connected to the rear frame (9), and the welding unit (4) and the rotating disk mechanism (3) installed in the tensioning mechanism (5), with the welding unit (4) containing the wire feeding mechanism (41), composite cable groups (42), blocks (43) of welding heads, welding heads (44), mechanisms (45) for adjusting welding heads and lifting cylinders (46) of welding heads, while the wire feed mechanism (41) is moved from the welding block (4) and located on the front frame (1), the blocks (43) of the welding heads are located on the casing of the mechanism (3) of the rotating disk and each block (43) welding head contains welding head (44), adjustment mechanism (45) the brew head and the lifting cylinder (46) of the welding head, wherein the mechanism (41) wire is connected to the welding head (45) a composite cable (42), a welding head (44) is connected to one end of the mechanism (45) for adjusting the welding head. 2. Machine according to claim 1, in which on the front frame (1) there are three groups of centering devices (13), each of which contains a support (131) of the cylinder, a cylinder (132), a connecting rod (133), a positioning unit (134 ), the rear thrust head (135) positioning the base plate (136) and the front thrust head (137), with one end of the cylinder support (131) mounted on the front frame (1) and the other end of the cylinder support (131) with one end the cylinder (132) of the centering device, the other end of the cylinder (132) of the centering device is connected to the positioning unit (134), the connecting rod (133) is connected to the positioning unit (134), the front thrust head (137) is located on the front upper end surface of the positioning unit (134), and the rear thrust head (135) is located on the rear lower end surface of the positioning unit unit (134), and while holding the cylinder (132) of the centering device, the outer surface of the rear thrust head (135) contacts the surface of the positioning base plate (136), so that the three rear thrust heads (135) are located in the same flat Spines, and the three front thrust heads (137) are aligned with the plane in which at this moment all welding heads (44) are located with ensuring alignment of the welding heads (44) with the welded edges (16) of the pipe butt when they rotate with the mechanism (3 a) rotating disc during welding. 3. Machine according to claim 1, in which the tensioning mechanism (5) contains two identical symmetrical structures, with one design of the tensioning mechanism (5) containing a hollow bushing (51), the first retaining nut (52), the bottom (53) of the cylinder, the drum cylinder, piston (54), piston rod (55), second lock nut (56), first cylinder cover (57), second cylinder cover (58), articulated support (59), connecting rod (510), distribution plate (512 ), the pusher rod (513), the tension block (514) and the guide sleeve (515), with the bottom (53) of the cylinder connected to the cylinder drum, ba The cylinder aban is connected to the first cylinder cover (57), and the first cylinder cover (57) is connected to the second cylinder cover (58) to form an internal cavity of the tensioning mechanism (5), with the guide sleeve (515) located in the middle of this internal cavity and has The hollow structure, one end of the guide sleeve (515) is fixed on one end of the hollow sleeve (51) in the axial transverse direction, and the other end of the hollow sleeve (51) is fixed to the bottom (53) of the cylinder using the first lock nut (52) so that the internal cavity of the hollow sleeve (51) communicates with The inner cavity of the guide sleeve (515), the outer circumference of the hollow sleeve (51) and the outer side surface of the guide sleeve (515) provide axial sliding and support for the piston rod (55), with one end of the piston rod (55) located on the outer side surfaces hollow bushing (51) and guide bushing (515) is connected to one end of the connecting rod (510) with an articulated support (59), the other end of the connecting rod (510) is connected to the lower end of the pusher rod (513), tension unit (514 ) located on the upper end of the rod (513) of the pusher, the other end of the piston rod (55) is connected to the piston (54) using a second lock nut (56), with the piston rod (55) positioned to move axially along with the piston (54), the distribution plate ( 512) is located between the second cylinder cover (58) and the guide sleeve (515), the pusher rod (513) is mounted to move up and down in the radial opening of the distribution plate (512), and gas inlet holes are made in the cylindrical drum of the cylinder. 4. Machine according to any one of claims 1 to 3, in which the guide sleeve (515) comprises a sleeve (515a), two connecting disks (515b) and connecting ribbed plates (515 s), and two connecting disks (515b) are located on two the symmetrical sides of the vertical axis, the sleeve (515a) in the direction of the transverse axis is connected to two connecting disks (515b) to form an integrated structure, and the connecting ribbed plates (515 s) are located between the two connecting disks (515b). 5. The machine according to claim 4, in which the rotating disk mechanism (3) contains a rotating disk rotation drive system (32), a rotating disk (36) and positioning mechanisms (37) of a rotating disk, the rotating disk (36) being located between the distribution plates (512) coaxially on both sides with distribution plates (512) and located on the radially outer side of the connecting disk (515b), positioning mechanisms (37) of the rotating disk are installed on the distribution plates (512), and the rotating disk drive system (32) A distributor with a distributor plate (512). 6. The machine according to claim 5, in which the system (32) of a rotating disk drive contains a rotating engine (321), a fixed unit (322), a fixing screw (323), a bearing (324), an anvil plate (325), a gear (326 ), a key (327) and a transmission shaft (328), with the fixed block (322) mounted on the distribution plate (512) of the tensioning mechanism (5) and, thus, has a high-precision positioning base, the rotating motor (321) is connected to one end gear shaft (328) with a key (327), the gear shaft (328) is held in a round hole distribution plate (512) with a bearing (324), and the other end of the transmission shaft (328) is connected to the gear (326) with a bolt and anvil plate (325) ensuring the alignment of the entire system (32) of the rotational drive and the rotational accuracy of the rotating disk ( 36). 7. The machine according to claim 5, in which the rotating disk (36) is split and includes an internal gear (361), a rotating disk housing (362), positioning the connecting bolt (363), a connecting plate (364) and threaded holes (365 ), while the housing (362) of the rotating disk has a composite structure and contains at least two arc bodies, which are fixedly connected by means of a connecting plate (364) and a positioning connecting bolt (363) with the formation of an integrated housing (362) of a rotating disk, internal tooth The crown (361) is located on the inner circumference of the casing (362) of the rotating disk and meshes with the gear (326) of the system (32) of the rotating disk drive, and the internal gear (361) and blocks (43) of the welding heads are fixed on the casing ( 362) rotating disk of the rotating disk mechanism (3), rotating disk case (362) has threaded holes (365) in the mounting points of welding head blocks (43) so that threaded holes (365) in rotating disk case (362), internal cavity guide bushings (515) and hollow inner cavity tulkus (51) form a channel for the composite cables (42) of the mechanism (41) for feeding wire to the welding heads (44). 8. The machine according to claim 5, in which the positioning mechanisms (37) of the rotating disk contain first rollers (371), first supports (372), first positioning wheels (373), positioning bearings (374), second positioning wheels (375), second supports (376), guide blocks (377), springs (378) and control sleeves (379), with the positioning bearings (374) mounted on the distribution plate (512) of the tensioning mechanism (5) using the first rollers (371) positioning bearings (374) are evenly distributed on one circumference of the distribution plate (512), in The outer circles of the positioning bearings (374) are in contact with the inner circumference of the rotating disk (3) to ensure radial positioning, the first supports (372) are mounted on the distribution plate (512) of the tensioning mechanism (5), each first positioning wheel (375) is fixed on the corresponding first the support (372), the outer circumference of each positioning wheel (375) is in contact with the side surface of the rotating disk (36) with axial positioning, guide blocks (377) are mounted on the distributor plate (512) of the tensioning mechanism (5), and each of the second supports (376) is connected to each guide block (377), while the second supports (376) are moved in the axial direction using guide blocks (377), each of the second the positioning wheels (375) is fixed on each respective second support (376), the spring (378) is located on the guide block (377), the control sleeve (379) is located on the outer end of the guide block (377), and the second positioning wheel (375) has the possibility of preloading its outer circumference of the lateral surface rotating disk (36) using a spring (378) and a regulating sleeve (379) to perform axial compression, and a regulating sleeve (379) and a guide block (377) are made with the ability to change the compressive force of the spring (378) by adjusting their relative positions. 9. Machine according to claim 2, in which between the hollow bushing (51) and piston rod (55) there is a sealing ring for sealing the cavity and a guide ring. 10. The machine according to claim 3, in which between the rear thrust heads (135) and the positioning base plates (136) and between the front thrust heads (137) and the welded edges of the pipe butt (16) are installed sensory devices, with six corresponding indicator devices placed with the possibility of determining during the centering operation the presence of the contact surfaces of the rear stop heads (135) with the positioning base plates (136), and the front stop heads (137) - with the welded edges of the pipe butt.

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