CN211028638U - Tunnel type welding system - Google Patents

Abstract

The utility model discloses a tunnel type welding system, which comprises a movable welding gun device and at least two tunnel type weldment loading units; the tunnel type weldment loading unit comprises a welding pressing mechanism, a welding supporting assembly and a positioning mechanism; the positioning mechanism comprises a positioning device, a position adjusting device and a position pressing device; the positioning device is provided with a plurality of positioning points which are distributed around the center and can be adjusted; the pressing device is positioned between the two positioning devices, one pressing device is respectively connected with corresponding limiting points on the two positioning devices, the pressing device can move along with the limiting points in a position adjusting way, the pressing device is provided with pressing positions, and at least two pressing positions are distributed around the central axis of the positioning device; the positioning device can synchronously and consistently drive the two positioning devices to lift and move; the welding and supporting component passes through the limiting points of the two positioning devices in a suspended mode. The tunnel type welding system can efficiently perform accurate welding on workpieces, can change the types immediately, improves the efficiency, and reduces time consumption and labor.

Description

Tunnel type welding system

Technical Field

The utility model relates to a welding equipment specifically is tunnel type welding system.

Background

The existing welding processing mode is that workers place a rolled workpiece on simple and fixed welding equipment to perform operations such as alignment, fastening, welding, removal and the like, and the efficiency and the precision are very low.

Some existing automatic welding equipment can partially or completely carry out corresponding welding procedures, and corresponding mechanical mechanisms are used for carrying out auxiliary or main operation in the processes of feeding, positioning, fastening, welding, blanking and the like, so that the defects of low efficiency, high cost, low precision and the like inherent in the fact that non-automatic processing equipment needs manual operation in the conventional production process are overcome.

However, before the existing automatic welding equipment is operated or a workpiece is loaded for feeding, the size of a to-be-welded cylinder needs to be set, so that a workpiece positioning clamp of the welding equipment needs to be adjusted or changed, even a correspondingly applicable positioning mold is selected or replaced, and then various parameters need to be corrected to match the workpiece, so that when the size of the to-be-machined workpiece is changed, corresponding time and labor cost need to be consumed, and the workpiece size cannot be quickly changed for rapid model change; moreover, the automatic welding devices are all integrated one-way welding structures, and can only carry out the operations of feeding, positioning, fixing and welding on a workpiece in sequence in the welding process, wherein in the feeding and blanking process, particularly when the size of the workpiece is adjusted and set, the positioning or fixing mechanism, the welding gun mechanism and other mechanisms are in a standby idle state, so the overall operation efficiency of welding is not high; in continuous mass production, only one welding device can obviously restrict the production efficiency, so that a plurality of welding devices can be used for simultaneously processing workpieces with different sizes, or a plurality of devices are simultaneously applied to a production line to perform a welding process so as to improve the production line efficiency, the flexibility is not high, a plurality of devices occupy more land, and the processing efficiency and the flexibility of the welding devices are quite limited.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model provides a tunnel type welding system can carry out welding process in batches high-efficiently to can directly trade the type, the flexibility is high.

The utility model provides a technical scheme that its technical problem adopted is:

the tunnel type welding system comprises a movable welding gun device and at least two tunnel type weldment loading units; the tunnel type weldment loading unit comprises a welding pressing mechanism, a welding supporting assembly and a positioning mechanism; the positioning mechanism comprises a positioning device, a position adjusting device and a position pressing device; the positioning device is provided with a plurality of positioning points which are distributed around the center and can be adjusted; the pressing device is positioned between the two positioning devices, one pressing device is respectively connected with corresponding limiting points on the two positioning devices, the pressing device can move along with the limiting points in a position adjusting way, the pressing device is provided with pressing positions, and at least two pressing positions are distributed around the central axis of the positioning device; the positioning device can synchronously and consistently drive the two positioning devices to lift and move; the welding support component passes through the space between the limit points of the two positioning devices in a suspended mode, the welding pressing mechanism is located above the welding support component, and the welding pressing mechanism can be correspondingly in compression joint with the upper end of the welding support component; the movable welding gun device can move along each tunnel type weldment loading unit correspondingly, and the movable welding gun device is provided with a movable welding gun.

The movable welding gun device comprises a walking beam, a walking supporting beam and a movable welding gun mechanism, wherein the walking supporting beam extends along each tunnel type weldment loading unit, the walking beam can be movably arranged on the walking supporting beam along the walking supporting beam, the movable welding gun mechanism is arranged on the walking beam, and the movable welding gun mechanism is provided with a movable welding gun.

The positioning device comprises a positioning ring and limiting pieces, the positioning ring is vertically arranged, the limiting pieces are equidistantly and circumferentially distributed on the positioning ring, each limiting piece can be radially adjusted along the positioning ring, and one end of each limiting piece, opposite to the center of the positioning ring, is a limiting point for abutting against a workpiece; the pressing device comprises a connecting rod and a pressing assembly, the connecting rod is parallel to the central line of the positioning device, two limiting parts corresponding to the two positioning devices are respectively connected with two ends of the connecting rod, and the pressing assembly is arranged on the connecting rod; the welding bearing component passes through the two positioning rings in a suspended mode, and the welding pressing mechanism is located above the welding bearing component between the two positioning rings.

The end of the limiting part is provided with a butt-joint rod, the butt-joint rod is parallel to the axis of the positioning ring, one end of the butt-joint rod is arranged on the limiting part and extends outwards, and the outward end of the butt-joint rod extends outwards along the radial direction in an inclined mode.

The limiting part is provided with a rod seat used for installing a rod body at the tail end, one side of the rod seat is connected with the limiting part, the rod seat is provided with a recessed port respectively connected with the abutting rod and the connecting rod, and the abutting rod and the connecting rod are flush with one side wall surface of the center of the opposite positioning device.

The positioning device also comprises a driving ring which is rotatably arranged on the positioning ring, the driving ring is in spiral transmission connection with the limiting piece, and the limiting piece is in sliding connection with the positioning ring; the locating part is slidably mounted on the sliding groove of the locating ring.

The pressing component comprises a fixed frame, a pressing component and a power cylinder, the fixed frame is fixedly connected with the connecting rod and the power cylinder respectively, and the pressing component is connected with a piston rod of the power cylinder.

The pressing device further comprises an alignment assembly, the alignment assembly is installed on the connecting rod, and the alignment assembly is provided with a movable blocking and connecting portion.

The positioning device comprises lifters, lifting seats for supporting and connecting the positioning devices are arranged on the lifters, each positioning device is connected with one lifter, and the two lifters are driven by a motor or a motor synchronously.

The welding bearing subassembly is longeron subassembly structure, and the one end that the welding bearing subassembly is used for the feeding suspends the setting in midair, and one of the corresponding feeding of welding bearing subassembly is served and is provided with the direction mould.

The utility model has the advantages that: the tunnel type welding system can efficiently perform batch accurate welding of workpieces, can change the models in real time according to the sizes of the workpieces, can automatically complete the process without manual operation, greatly improves the production efficiency, can reduce time consumption and manpower, and can be flexibly configured and occupy less land.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of an overall installation structure of an embodiment of the present invention;

FIG. 2 is a partially exploded view of the mounting structure of the tunnel weldment loader assembly according to an embodiment of the present invention;

fig. 3 is a partially exploded view of the mounting structure of the positioning mechanism according to the embodiment of the present invention;

fig. 4 is a schematic view of an installation structure of a positioning device in an embodiment of the present invention;

fig. 5 is a schematic view of an installation structure of the pressing component in the embodiment of the present invention;

fig. 6 is a schematic view of a connection structure of a position limiting member and a connecting rod according to an embodiment of the present invention;

FIG. 7 is a schematic view of an exemplary embodiment of a welded bolster assembly of the present invention;

FIG. 8 is a schematic structural view of a movable welding gun device according to an embodiment of the present invention;

fig. 9 is a schematic view of an installation structure of the movable welding gun device and the space frame according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 and 2, the tunnel welding system of the present invention includes a movable welding gun device and at least two tunnel weldment loader sets; the tunnel type weldment loading unit comprises a welding pressing mechanism 4, a welding supporting component 5 and a positioning mechanism; the positioning mechanism comprises a positioning device, a position adjusting device and a position pressing device; the positioning devices are two and correspond to each other front and back, each positioning device is provided with a plurality of centering and surrounding distributed position-adjustable limit points, and the two positioning devices can synchronously adjust the position of the limit points to adapt to a rolled cylinder, a tubular workpiece or an inner container workpiece; the pressing device is positioned between the two positioning devices, one pressing device is respectively connected with corresponding limiting points on the two positioning devices, the pressing device can move along with the position adjustment of the limiting points, the pressing device is provided with pressing positions for abutting against the middle section of the workpiece, and preferably at least two pressing positions are distributed around the central shaft of the positioning devices; the positioning device can synchronously and consistently drive the two positioning devices to lift and move; the welding and supporting component 5 passes through the space between the limit points of the two positioning devices in a suspended manner, the welding and pressing mechanism 4 is positioned above the welding and supporting component 5, and the welding and pressing mechanism 4 can be correspondingly pressed with the upper end of the welding and supporting component 5; the movable welding gun device can correspondingly move along each tunnel type weldment loading machine set, and the movable welding gun device is provided with a welding gun which can correspondingly move along the welding bearing component 5.

The welding supporting component 5 is of an elongated structure, one end of the welding supporting component is located on the outer side of one end of the longitudinal welding machine in a suspended mode, the other end of the welding supporting component 5 is located on the outer side of the other end of the longitudinal welding machine, the two ends of the welding supporting component 5 are respectively a discharging end and a feeding end, the welding supporting component 5 and the welding pressing mechanism 4 are fixed point positions, and the positioning device and a limiting point of the positioning device are movably adjusted relative to the welding supporting component 5; the feeding mode of the tunnel type weldment loading machine set is that one end of a rolled cylinder workpiece is surrounded and placed into a positioning mechanism along a welding supporting component 5, the workpiece is limited and pressed through the positioning mechanism, then two ends of the welding seam of the workpiece are pressed to the upper end of the welding supporting component 5 through a welding pressing mechanism 4, welding can be carried out through a welding device, the workpiece is discharged from the suspended end of the welding supporting component 5 after the discharge is finished, in addition, the welding supporting component 5 can be of a welding mandril or longitudinal beam structure, the welding pressing mechanism 4 can be realized through a pressing plate or a pressing block mechanism, and a welding gun of a movable welding gun device can be welded along a seam during welding; the movable welding gun device can be a welding manipulator arranged on a mechanism with independent movement, such as a ground moving base, or a welding gun mechanism of an inverted hanging type movable base, and the like, and can also be connected with each unit mechanism in a mode of realizing movement corresponding to the range of each unit.

The two positioning devices are respectively arranged in tandem or one end to one end, workpieces horizontally arranged are clamped through limiting points, each limiting point can synchronously move with the pressing device to realize position adjustment and can clamp the workpieces with different sizes, each limiting point can be firstly adjusted to a position matched with the workpiece and then is abutted by each limiting point in the positioning device, and then each limiting point synchronously condenses towards the central direction, so that the two positioning devices can clamp the two ends of the workpiece, meanwhile, the pressing device clamps the middle section part of the workpiece through the pressing position, the clamping is realized by front, middle and back linkage, the two positioning devices are driven by the positioning devices to change the positions of the positioning devices, and the positioning devices correspondingly rise or reduce the numerical value reduced or increased with the peripheral radius of the workpiece, so that the highest position of the outer wall of the workpiece can be kept unchanged; the positioning devices can directly realize a plurality of limit points by a plurality of pneumatic cylinders, hydraulic cylinders and the like, and can also be realized by a mechanism such as a mandril, a clamping mechanism and the like, meanwhile, the two positioning devices can synchronously control the independent operation of respective position adjustment of the limit points through a control system, and the linkage execution of the respective position adjustment can also be realized by utilizing a linkage structure; the pressing device can be realized by a general pressing mechanism or a fixture mechanism driven by hydraulic pressure and air pressure, such as a hydraulic rod for stretching and pressing, and a multi-hydraulic rod for driving or a pull rod for driving a double-sided or multi-sided clamping mechanism; the positioning device can be a hydraulic cylinder, a pneumatic cylinder and the like which directly drive the positioning device to move, and can also be a motor-driven driving mechanism which drives the positioning device to move, for example, a transmission structure of a screw mechanism, and in addition, the positioning device can also be realized by a movable platform or a pedestal.

Every tunnel type weldment loader unit all can carry out the loading work piece of different sizes that directly remodels at any time alone, and no matter every unit is applied to same one or a production water line respectively simultaneously, each unit homoenergetic effectively reduces consuming time to have the nimble suitability of size on a large scale. The movable welding gun device can move to a corresponding position along each unit and can circularly weld workpieces of each unit in sequence through reasonable planning and scheduling, so that the movable welding gun device and each unit are always in a reasonable and orderly continuous operation state, namely, the tunnel type welding system can flexibly adjust working conditions according to actual conditions, for example, each unit respectively finishes workpiece loading in turn, the movable welding gun device circularly cooperates with the units in sequence to weld, or when the units stop operating or stop operating alternately due to the needs of maintenance, repair and the like, the movable welding guns can cooperate with each other to operate, so that the individual units in the tunnel type welding system can continue to weld even if the units break down, and the tunnel type weldment loading unit can be designed in a pass-through mode or an in-out mode.

Referring to fig. 1, 8 and 9, the movable welding gun device comprises a walking beam 61, a walking support beam 62 and a movable welding gun mechanism 63, wherein the walking support beam 62 extends along each tunnel type weldment loader, the walking support beam 62 can be erected above the end part of the tunnel type weldment loader or at a position outside the end part, the tunnel type weldment loader can be arranged side by side, in parallel, at an included angle or around the center, the walking support beam 62 can be designed to extend in a straight line, a bent line or other shapes as required, the walking beam 61 can be movably mounted on the walking support beam 62 along the walking support beam 62, the walking beam 61 can drive a driving wheel, a crawler belt and the like to move on the walking support beam 62 by arranging a motor, or the motor drives a gear rack, a screw nut, a chain sprocket to be matched in a sliding way or to suspend and the like to realize the movement of the walking beam 61, the movable welding gun mechanism 63 is mounted on the walking, the movable welding gun mechanism 63 is provided with a movable welding gun, the welding gun can realize welding along the joint of the cylindrical workpiece through a multi-shaft movable structure, a mechanical arm structure or a multi-joint movable structure driven by a motor, the movable welding gun device moves to the position of the tunnel type weldment loading machine set along the walking supporting beam 62 through the walking beam 61, and then the welding gun of the movable welding gun mechanism 63 is welded.

Referring to fig. 8 and 9, the lower side of the walking beam 61 and the upper side of the walking beam 62 are respectively provided with a slide block and a guide rail which are in sliding fit with each other, the walking beam 61 is erected on the walking beam 62, the walking support beam 62 is provided with a rack extending along the walking support beam, the walking beam 61 is provided with a walking drive gear which is driven by a motor and meshed with the rack, the walking beam 61 is a horizontal and transverse straight beam, the movable welding gun mechanism 63 is vertically and movably connected at one side of the walking beam 61 and moves along the walking beam, a welding gun of the movable welding gun mechanism 63 is positioned at one side of the movable welding gun mechanism 63, which is opposite to the walking beam 61, and can lift up and down along the walking beam, the horizontal movement of the movable welding gun mechanism 63 along the walking beam 61 and the up-down movement of the welding gun form two mutually vertical moving shafts which basically correspond to the requirements of straight seam welding, the walking beam 62 is designed corresponding to the tunnel weldment loader unit so that the walking beam 61 moves to cover each unit.

Referring to fig. 9, the walking support beams 62 are straight beams and at least two walking support beams are arranged in parallel, the lower sides of two ends of each walking support beam 62 are respectively connected with an upright column 71 for supporting, the upright columns 71 are fixedly connected with a base 72, the tunnel type weldment loading units are arranged in parallel along the extending direction of the walking support beams 62 and are detachably connected to the bases 72, each unit can be correspondingly assembled and disassembled on the bases 72 as required, the walking beams 61 can move along the walking support beams 62 and can move back and forth to each unit together with the movable welding gun mechanism 63, any unit can be assembled and disassembled at any time, the welding gun device is not influenced to continue to be welded with other units, and a modularized flexible welding system can be realized to meet various use requirements; the other two walking support beams 62 can also be designed as curved beams, and the units can be arranged correspondingly around the center of the curved beam, for example, the units are arranged at an included angle of 45 degrees or a right angle, and the walking support beams 62 with a straight beam structure can extend unidirectionally and randomly.

The two walking support beams 62 are respectively positioned above two ends of the tunnel type weldment loading machine set, the upright posts 71 respectively connected with the two walking support beams 62 are correspondingly and respectively connected with connecting frames 73 perpendicular to the walking support beams 62, the two bases 72 are respectively positioned below two ends of the tunnel type weldment loading machine set, the bases 72 are fastened through the connecting frames 73, and the upright posts 71, the bases 72, the connecting frames 73 and the walking support beams 62 form a three-dimensional frame structure with good strength and lower weight.

Referring to fig. 8, two ends of the walking beam 61 are respectively installed on two walking support beams 62, the walking beam 61 is provided with a motor driving device 611 for respectively and synchronously driving the walking drive gears at the two ends through a transmission mechanism, preferably, the motor driving device 611 is connected with a transmission shaft on a bearing seat through a belt pulley mechanism, one end of the transmission shaft is connected with a gear set or directly drives the walking drive gear at one end of the walking beam 61, the other end of the transmission shaft is connected with another transmission shaft through a coupler for similarly driving the walking drive gear at the other end of the walking beam 61, here, the two transmission shafts can also be replaced by a transmission shaft, only the structure such as the bearing seat has higher precision, or the two ends of the walking beam 61 can also be respectively provided.

Referring to fig. 8, the upper side of the walking beam 61 and the front side facing the movable welding gun mechanism 63 are provided with guide rails, the rear side of the movable welding gun mechanism 63 is provided with a slide block and an inverted 'L' slide frame 631 correspondingly overlapping the upper side of the walking beam 61, the lower side of the slide frame 631 is also provided with a slide block, the slide block at the rear side of the movable welding gun mechanism 63 is in slide connection with the guide rails at the front side of the walking beam 61, the slide block at the lower side of the slide frame 631 is in slide connection with the guide rails at the upper side of the walking beam 61, the walking beam 61 is further provided with a rack, the movable welding gun mechanism 63 or the slide frame 631 is provided with a motor device, the motor device is connected with a gear in matching and meshing with the rack of the walking beam 61, the transmission connection mechanism for converting rotation into linear movement by the gear meshing rack can also be realized by the cooperation of the roller and the friction surface, the cooperation of the worm wheel and the worm, the pulley and the transmission belt, the movable welding gun mechanism 61 is connected with the walking beam 61 through the slide frame 63, the movable welding gun mechanism 63 is greatly improved in stability, thereby ensuring the accuracy of the welding gun in welding, and the movable welding gun mechanism can be designed preferably designed by the.

Referring to fig. 9, preferably, a motor is arranged at the upper end of the movable welding gun mechanism 63 to drive a vertical screw nut mechanism to drive the welding gun to move up and down, the welding gun is in sliding connection with the movable welding gun mechanism 63 through the matching of a slide block and a guide rail, the screw rod and the guide rail of the movable welding gun mechanism 63 are parallel and vertically arranged, and the guide rails on the walking beam 61 and the walking support beam 62 are both linearly extended in a horizontal plane and are perpendicular to each other, so that a linear three-axis moving structure of the welding gun is formed, and the stability of welding.

Referring to fig. 3 and 4, the positioning device includes a positioning ring 11 and limiting members 12, the positioning ring 11 is vertically installed, a plurality of limiting members 12 are equidistantly and circumferentially distributed on the positioning ring 11, each limiting member 12 can be synchronously adjusted radially along the positioning ring 11, and one end of the limiting member 12 opposite to the center of the positioning ring 11 is a limiting point for abutting against a workpiece; the pressing device comprises a connecting rod 31 and a pressing component 32, the connecting rod 31 is parallel to the central line of the positioning device, two limiting parts 12 corresponding to the two positioning devices are respectively connected with two ends of the connecting rod 31, and the pressing component 32 is installed on the connecting rod 31; the welding support component 5 passes through the two positioning rings 11 in a suspended mode, and the welding pressing mechanism 4 is located above the welding support component 5 between the two positioning rings 11; one side or one end of the pressing component 32 opposite to and abutted against the workpiece is a pressing position of a pressing device, the pressing component 32 can be a pressing block structure or an abutting point structure, the pressing component 32 can be used for installing the required pressing component 32 on the connecting rod 31 at the required position according to the factors of the shape, stress and the like of the workpiece, the pressing component 32 can be distributed in a plurality of numbers around the central line, namely the workpiece, or distributed in a plurality of numbers along the connecting rod 31 as required, so that sufficient pressing position abutting is provided from the annular and axial positions respectively, the pressing component 32 can approach or depart from the workpiece along with the connecting rod 31 and the limiting part 12, and meanwhile, the pressing component 32 can drive the pressing component 32 to abut against the workpiece through a hydraulic mechanism, a pneumatic cylinder or a motor connecting screw and other telescopic mechanisms; the positioning ring 11 is of an annular structure, the central part of the positioning ring is hollow, a workpiece and other mechanisms can penetrate through the positioning ring, the positioning ring can be suitable for hollow pipe type, barrel type workpieces or solid workpieces, the limiting part 12 can be directly clamped by a hydraulic rod or a pneumatic rod to advance and retract, the limiting part 12 can also be driven by a motor through a gear rack structure or a gear screw structure, and the positioning device can adjust the outer diameter sizes of the corresponding different workpieces through the radial movement of the limiting part 12 on the positioning ring 11.

Referring to fig. 4, the positioning device further includes a driving ring 13, the driving ring 13 is concentrically and rotatably mounted on the positioning ring 11, the driving ring 13 is in screw transmission connection with the limiting member 12, and the limiting member 12 is in sliding connection with the positioning ring 11; the driving ring 13 can be matched with the latch, the pin shaft or the guide post of the limiting part 12 through a spiral groove or a curved groove to perform spiral transmission, the positioning ring 11 is provided with a radially extending sliding groove matched with the sliding connection of the limiting part 12, the limiting part 12 is slidably mounted on the sliding groove of the positioning ring 11, and the cross section of the limiting part 12 is in an I shape, so that the limiting part 12 can only slide along the sliding groove of the positioning ring 11; the driving ring 13 is movably sleeved on the annular wall protruding in the axial direction of the positioning ring 11, and can also be slidably embedded in the inner side of the positioning ring 11, the driving ring 13 can be driven to rotate by a motor or a transmission mechanism, and then the rotation of the driving ring is converted into the linear motion of the limiting piece 12, the mechanism of the mechanism is the same as that of a common three-jaw chuck, so that the connection example of the driving ring 13 and the limiting piece 12 is omitted in the drawing, the limiting piece 12 is driven by the rotation of the driving ring 13, that is, all the limiting pieces 12 are driven simultaneously, and the driving ring.

Referring to fig. 4, the positioning device further includes a driver 14, an outer wall of the driver 14 is tightly connected with the positioning ring 11, the driving ring 13 is a toothed ring, the driver 14 correspondingly extends out of a driving shaft assembly with a gear to be in threaded connection with a side wall of the driving ring 13, the driver 14 can be a rotating shaft of a servo motor or a motor directly connected with the side wall of the driving ring 13 or a driving shaft passing through a reduction box and then passing through the gear driving ring 13, as shown in the figure, a tooth surface of the driving ring 13 is preferably designed into an outer ring surface, and the driver 14 is engaged and driven from the outer side of the driving ring 13; each part of the positioning device is integrated on the positioning ring 11, so that the module body formed by each accessory is convenient.

Referring to fig. 3 and 4, the end of the limiting member 12 is provided with an abutting rod 121, the abutting rod 121 is parallel to the axis of the positioning ring 11, one end of the abutting rod 121 is installed on the limiting member 12 and extends outward, the outward end of the abutting rod 121 extends outward along a radial direction, the abutting rod 121 uses a rod body as an abutting surface, when installed, a workpiece passes through the positioning ring 11 from the outer side of one positioning device along the axial direction, the abutting rod 121 is used as a bearing and gear component and contacts the outer wall of the workpiece with low pressure in a limiting manner, meanwhile, an outward flared horn formed by each abutting rod 121 can be guided into the workpiece and arrives at the two positioning devices in an aligned manner, the abutting rod 121 can be preferably a round rod, and a plurality of round rod bodies can be directly applied to; preferably, each positioning ring 11 has an even number of limiting members 12 symmetrically distributed left and right, and each two opposite limiting members 12 are located on the same radial straight line, so that the roundness of the cylinder workpiece can be better maintained.

Referring to fig. 4, a rod seat 122 for mounting a rod body is disposed at the end of the limiting member 12, one side of the rod seat 122 is connected to the limiting member 12, a recessed opening for respectively connecting the abutting rod 121 and the connecting rod 31 is disposed at the lower end of the rod seat 122, the ends of the abutting rod 121 and the connecting rod 31 are opposite and flush with a side wall surface facing the center of the positioning device, the outer diameter of the abutting rod 121 is smaller than that of the connecting rod 31, the recessed opening of the rod seat 122 is segmented into a segment with a higher position and a smaller inner diameter at one side, a lower position and a larger inner diameter at the other side, the abutting rod 121 and the connecting rod 31 are respectively assembled at two sides and flush with a side surface of the abutting, except for a limiting point for connecting the two positioning devices, the connecting rod 31 is used as an extension of the abutting position of the abutting rod 121 to contact with the surface of a workpiece, so as to increase the stability and the firmness of, for example, the abutment bars 121 of the two positioning means extend towards each other in the middle.

Referring to fig. 5, the pressing component 32 includes a fixed frame 321, a pressing component 322 and a power cylinder 323, the fixed frame 321 is respectively and tightly connected with the connecting rod 31 and the power cylinder 323, the pressing component 322 is connected with a piston rod of the power cylinder 323, one end of the pressing component 322 faces to a center line of the positioning device and corresponds to a pressing workpiece, the power cylinder 323 drives the pressing component 322 to move towards the workpiece and realize pressing, the pressing component 32 uses the fixed frame 321 as a base to fix the power cylinder 323, the power cylinder 323 further drives the pressing component 322 to press and retreat towards the workpiece, the pressing component 32 is an active pressing position, the pressing position is more flexible and accurate, preferably, the pressing component 32 is distributed with four groups of pressing positions around the workpiece, namely four pressing positions are respectively located at the middle section and two sides of the lower section of the cross section of the workpiece, and a clamping position of the welding and pressing mechanism 4 is matched to.

Referring to fig. 5, the pressing component 32 is in a shape of a portal frame, two ends of the fixed frame 321 are respectively provided with a connecting plate 3211 for vertically connecting the connecting rod 31, the pressing component 322 is located between the lower side of the fixed frame 321 and the connecting rod 31, the power cylinder 323 is installed on the upper side of the fixed frame 321, a piston rod of the power cylinder 323 passes through an opening of the fixed frame 321 and is connected with the pressing component 322, two ends of the pressing component 322 are respectively provided with a pressing block 3221, the pressing block 3221 is in an arch-like shape, the middle of the pressing block 3221 is an abdicating notch corresponding to the abdicating connecting rod 31, the lower ends of two sides of the pressing block 3221 are respectively provided with a pressing rod 3222 for abutting against a workpiece, at least two pressing rods 3222 of one pressing component 32 are respectively located at two sides of the connecting rod 31 and are parallel to the connecting rod 31, the connecting rod 31 passes through the connecting plate 3211 at one end of the fixed frame 321, the connecting rod 31 is, two sides of two pressing blocks 3221 of one pressing member 322 are respectively provided with a same pressing rod 3222, the pressing member 322 is driven by the power cylinder 323, the pressing member 322 can move up and down in the space between the fixed frame 321 and the connecting rod 31, when moving down along with the pressing member 322, the arched notch in the middle of the pressing block 3221 is matched with the abdicating connecting rod 31, so that the position conflict between the pressing block 3221 and the connecting rod 31 is avoided, the pressing rod 3222 moves along with the pressing member 322 to press and abut against the workpiece at two pressing positions, and the pressing mode of at least two rod bodies can better keep the workpiece to be round.

Referring to fig. 5, the top pressing member 322 is provided with two guide rods 3223 extending toward the fixed frame 321, the fixed frame 321 is provided with two sleeves 3212 correspondingly sleeved with the guide rods 3223, the upper surface of the fixed frame 321 is rectangular, the guide rods 3223 and the sleeves 3212 are respectively arranged on two sides of the power cylinder 323 in a linear array, the guide rods 3223 penetrate through the sleeves 3212 from the lower side of the fixed frame 321 to be in sliding fit, and the top pressing member 322 is guided to move stably in a reciprocating manner.

Referring to fig. 5, the connecting plate 3211 is a separate component vertically connected to the lower side of the end of the fixed frame 321, the connecting plate 3211 is fastened and connected by passing through the fixed frame 321 through bolts or screws, a gap is left between the middle section and the end of the connecting plate 3211 to divide the connecting plate into two parts and facilitate deformation, meanwhile, the end of the connecting plate 3211 is provided with an arc-shaped clamping opening for clamping the connecting rod 31, and a matching bolt transversely passes through the middle section of the connecting plate 3211 to draw the two parts together so as to clamp the connecting rod 31; similarly, the pressing block 3221 is also an independent component and is vertically fastened and connected to two ends of the pressing member 322 through a bolt and a screw, the tail end of the pressing block 3221 is also provided with an arc-shaped clamping opening for clamping the pressing rod 3222, a gap which divides the tail end of the pressing block 3221 into two parts and facilitates slight deformation is similarly reserved between the middle section and the tail end of the pressing block 3221, and the pressing rod 3222 is clamped by the bolt which is matched with the bolt to transversely penetrate through the middle section of the connecting pressing block 3221 and pull the two parts together; the fixed frame 321 and the connecting plate 3211, and the pressing member 322 and the pressing block 3221 may also be integrally formed components.

Referring to fig. 3 and 6, the positioning device further includes an alignment assembly 33, the alignment assembly 33 is mounted on the connecting rod 31, the alignment assembly 33 has a movable blocking portion, the positioning assembly is set to a position close to one of the positioning devices, and the blocking portion blocks the movement of the workpiece along the central line direction of the positioning device, before loading the workpiece or during unloading the workpiece, the blocking portion can move away from the blocking portion to facilitate the workpiece entering and exiting or loading and unloading, and the blocking portion of the alignment assembly 33 can be implemented by a blocking member capable of rotating back and forth, swinging or extending, such as a hinge member capable of rotating only around the connecting rod 31, or a lock pin capable of extending out of the connecting rod 31.

Referring to fig. 6, the alignment assembly 33 includes a connecting frame 331 and a cylinder 332, one end of the connecting frame 331 clamps the connecting rod 31 through a clamping member, the cylinder 332 is fixedly mounted on the connecting frame 331, and a stopper serving as a stopper is mounted at the end of a piston rod of the cylinder 332, a guide hole matching with the piston rod passing through the cylinder 332 in a sliding manner is further provided on the connecting frame 331, the cylinder 332 drives the stopper to move back and forth into the positioning device, a workpiece is loaded on the clamping mechanism and needs to move along a central line to reach a corresponding position, the alignment assembly 33 pushes out the stopper through the cylinder 332 before the workpiece is loaded, so that the end of the workpiece after being loaded reaches and abuts against the stopper to be stopped as a reference position, when the workpiece is unloaded, the cylinder 332 moves the stopper away from the position, and the workpiece can be safely removed from the positioning mechanism.

Referring to fig. 3, the positioning device includes lifters 21, each lifter 21 is provided with a lifting seat for supporting and connecting to a positioning device, each positioning device is connected to one lifter 21, the two lifters 21 are driven by a motor or motors synchronously, the lifter 21 generally uses a screw transmission mechanism with the same jack mechanism, the bottom of the positioning device or positioning ring 11 can be connected to the lifting seat of the lifter 21 to move with the lifting, because the two positioning devices are separated by a certain distance, preferably, a single lifter 21 can simultaneously support two positioning rings 11 through the lifting seat, or a more complex structure is needed to keep the two positioning devices stably lifted at the same time, so preferably, one lifter 21 drives one positioning device, and the two lifters 21 are connected to one commutator 22 through transmission shafts respectively, and then connected to one motor or motor through the commutator 22 for transmission connection, two motors or motors are not required to be respectively connected with the two lifters 21, as shown in the figure, a lifting motor 25 is connected with the commutator 22 and positioned between the two positioning devices, and meanwhile, two sides of the commutator 22 are respectively connected with and driven by the lifters 21 through a driving connecting shaft, so that synchronous operation can be realized, and the structure can be kept simple.

Referring to fig. 2 and 3, the positioning device further includes a guide post 23 and a guide sleeve 24, the guide post 23 is vertically arranged along the lifting direction of the lifter 21, the guide sleeve 24 is slidably sleeved on the guide post 23, and the positioning device is connected with the guide sleeve 24, preferably, the two sides of the positioning ring 11 are respectively connected with the guide sleeve 24, the guide sleeve 24 is respectively slidably sleeved on the two guide posts 23 of the stand 9, of course, the guide post 23 can also be of a stand column structure without being supported by the stand 9, when the lifter 21 drives the positioning ring 11 to lift, the guide post 23 is matched with the guide post 23 to enable the positioning ring 11 to stably and accurately lift.

Referring to fig. 2 and 7, the welding support assembly 5 is a longitudinal beam assembly structure, one end of the welding support assembly 5 for feeding is arranged in a suspension way, one end of the welding support assembly 5 for feeding is connected with a vertical frame 9 in a suspension way through a hanging frame 91, when a workpiece is loaded along the welding support assembly 5, the joint of the workpiece correspondingly passes through the welding support assembly 5 or the joint of the welding support assembly and the hanging frame 91, so that the whole workpiece can not be hindered by suspension connection, the welding supporting component 5 can also be distributed and supported along the axial direction of the workpiece through a plurality of movable supporting columns, when the workpiece is loaded, the plurality of movable supporting columns can be correspondingly moved away and then reset to support the welding supporting component 5, when the work piece loads, weld bearing subassembly 5 both ends have the activity pillar support can, consequently weld bearing subassembly 5 also can support through the activity pillar in the one end of ejection of compact, even the work piece entangles weld bearing subassembly 5 also can be followed the one end of ejection of compact and removed the dress through shifting out the activity pillar after the welding is accomplished.

Referring to fig. 2 and 7, a guiding mold corresponding to the seam of the barrel workpiece is arranged at one end of the welding and supporting component 5 corresponding to the feeding, the guiding mold comprises a wedge-shaped, conical or acute-angle-shaped pointed guiding block 51 and a narrow-mouth-shaped limiting clamping mouth 52, the guiding block 51 is vertically erected on the end of the welding and supporting component 5, the limiting clamping mouth 52 is respectively arranged at two sides of the guiding block 51, the bearing surface in the limiting clamping mouth 52 corresponds to the surface of a lining plate 53 at the upper end surface of the welding and supporting component 5, when the rounded barrel workpiece is loaded on the welding and supporting component 5, the workpiece seam is correspondingly arranged along the guiding block 51, the pointed end of the guiding block 51 correspondingly divides the workpiece seam at the left side and the right side, and correspondingly falls into the limiting clamping mouth 52 to the height of the surface of the lining plate 53, therefore, the workpiece seam is correspondingly arranged at the right position on the lining plate 53 along with the axial movement of the welding and supporting component 5, the welding and supporting component 5 is further provided with an, the alignment baffle plate 54 is used for extending out before welding to align and splice the seams of the workpieces, the workpieces can be taken in the welding and supporting assembly 5 to be welded after being completely fixed by the positioning mechanism, the alignment baffle plate 54 enters and exits from the preset gap of the lining plate 53, and the extension and retraction of the alignment baffle plate 54 can be realized by the reciprocating mechanism or the rotating mechanism.

Referring to fig. 7, a pusher 55 capable of moving back and forth along an axial direction is installed on a side wall of the welding support assembly 5, a pushing plate capable of being pressed down elastically is installed on the pusher 55, a guide rail extending along an axial direction is installed on a side wall of the welding support assembly 5, the pusher 55 is provided with a slider matching with the sliding guide rail, the welding support assembly 5 is further provided with a transmission mechanism for driving the pusher 55, when a cylindrical workpiece is loaded on the welding support assembly 5, the pusher 55 is located at a feeding end, the workpiece presses down the pushing plate of the pusher 55 when passing through, then the pushing plate of the pusher 55 rebounds and resets, a side edge of the discharging end of the welding support assembly 5 can be abutted against an end edge of the workpiece, so that the pusher 55 can push the workpiece to move along the welding support assembly 5 without transporting the material by an external mechanism, the pusher 55 can convey the workpiece to a corresponding welding position on a lining plate 53, and push the workpiece away from the, the pusher 55 is a unidirectional feeding and discharging manner in which it is elastically pressed down from only one end for feeding, so that it is suitable for use in conjunction with a positioning structure and an operation structure of the welding and supporting assembly 5, and particularly, a welding machine can be applied to a fully automated production line, and the efficiency can be effectively improved by feeding workpieces in succession and discharging workpieces in succession.

Referring to fig. 7, a material pushing plate of the material pushing device 55 is a single-side hook-shaped member, a lower end of the material pushing plate is hinged to the material pushing device 55, an elastic member such as a pressure spring, a spring, etc. is connected between the material pushing plate and the material pushing device 55, the material pushing plate has a smooth surface with a plane or an arc surface facing a side of a material feeding end of the welding supporting component 5, the material pushing plate has a hook-shaped protrusion facing a side of a material discharging end of the welding supporting component 5, when a workpiece is fed in, an end edge of the workpiece abuts against the smooth surface of the material pushing device 55 so that the workpiece can be more easily rotated around the hinged portion to be pressed downwards, then the hook-shaped protrusion of the material pushing device 55 can be clamped with the edge of the other end of the workpiece after being elastically reset and can avoid slipping, the material pushing device 55 can; the side wall of the welding supporting component 5 is provided with a synchronous belt mechanism which is parallel to the guide rail and is driven by a motor, the material pushing device 55 is connected with the synchronous belt, the synchronous belt mechanism drives the material pushing device 55 to reciprocate along the guide rail, the belt wheel motor can be fixed on the welding supporting component 5, the material pushing device 55 can also drive a matched sliding chute slide block to realize the reciprocating through a gear rack mechanism, preferably, two groups of guide rails are respectively arranged on the two side edges of the welding supporting component 5, the synchronous belt mechanism and the material pushing device 55 are respectively arranged in parallel up and down on the guide rail and the synchronous belt mechanism on each side wall, the material pushing device 55 is respectively connected with the corresponding synchronous belt, the material pushing device 55 at the lower part extends upwards through the frame body to enable the material pushing plate and the material pushing device 55 at the upper part to be at the same horizontal position, the two material pushing devices 55 at the two sides respectively carry out material loading and material returning operations along the welding bearing component 5 at the same time, and the position of a workpiece is ensured to be accurate by matching with the aligning component 33.

Referring to fig. 2, the welding pressing mechanism 4 is a key pressing mechanism disposed correspondingly on the left and right, two ends of the welding pressing mechanism 4 are connected with corresponding vertical frames 9, the welding supporting component 5 and the positioning devices are supported or supported by the vertical frames 9, obviously, at least two vertical frames 9 are disposed at two ends of the welding machine respectively, positioning rings 11 of the two positioning devices are movably connected with the vertical frames 9, the welding pressing mechanism 4 is erected on the welding supporting component 5 between the two positioning devices by the vertical frames 9, and meanwhile, the welding supporting component 5 is suspended at one feeding end by the vertical frames 9 and passes through the two positioning devices, so that a workpiece needs to be processed as if passing through a tunnel along the welding supporting component 5 by the positioning mechanisms, the vertical frames 9 and the welding pressing mechanism 4 to go in and out; in addition, the vertical frame 9 can be a single frame structure or a double-frame structure connected with a double-frame structure, a vacant position can be reserved between the frame bodies as a space for moving and adjusting the positioning device in the double-frame structure shown in fig. 1, and meanwhile, the two frame bodies can be respectively connected with the welding pressing mechanism 4 and the welding supporting component 5.

Referring to fig. 1-3, the tunnel weldment loader further comprises a machine base for carrying the welding pressing mechanism 4, the welding supporting assembly 5 and the positioning mechanism, wherein the vertical frames 9 of the single frame or double frame structure are vertically installed at positions close to two ends of the machine base, the positioning device is also installed on the machine base, the lower sides of two ends of the machine base are respectively connected with two bases 72 in an assembling and disassembling manner, the lower sides of two ends of the machine base are respectively provided with a connecting block, and the connecting blocks are connected with the bases 72 in an adjustable position manner through horizontally extending bolts, so that the tunnel weldment loader can conveniently adjust the positions of the tunnel weldment loader on the bases 72 to correspond to the movable welding gun devices; in addition, the connecting frame 73 can be disposed in a space below the unit base as needed without interference, thereby ensuring that the space frame has sufficient strength while effectively simplifying the structure.

A method of operating a tunnel welding system, comprising the steps of: firstly, each tunnel type weldment loading unit synchronously regulates and controls the position of each limiting point to a position corresponding to and close to the outer wall of a workpiece through two positioning devices of the tunnel type weldment loading unit in a linkage manner according to the outer diameter size of a cylinder workpiece to be processed, and the positioning devices drive the two positioning devices to lift and shift so that the distance from the center of each positioning device to the upper end surface of a welding supporting component 5 corresponds to the radius of the workpiece; sequentially loading the components of each tunnel type weldment loader into workpieces in sequence, correspondingly putting one end of a rolled cylinder workpiece into a positioning mechanism along the axial direction of a welding and supporting component 5, overlapping the inner side of the joint of the cylinder workpiece with the upper end face of the welding and supporting component 5, limiting the shape and the position of the cylinder workpiece by a limiting point of the positioning device, correspondingly moving and pressing the pressing position of each pressing position device towards the cylinder workpiece, and pressing the joint of the cylinder workpiece on the welding and supporting component 5 by a welding and pressing mechanism 4; thirdly, moving the movable welding gun device to the tunnel type weldment loading units in sequence to weld the cylinder workpiece into a cylinder whole at the joint, loosening the compression joint position of the compression joint device and the welding pressing mechanism 4 of each tunnel type weldment loading unit after welding is finished, and moving the cylinder workpiece out of the other end of the welding supporting component 5; and fourthly, each tunnel type weldment loading unit carries out loading of the next workpiece for welding, if the size of the workpiece is not changed, the second step and the third step are repeated, and if the size of the workpiece is changed, the first step, the second step and the third step are repeated.

The tunnel type welding system enables the cylinder workpieces to be positioned and fixed in each tunnel type weldment loading unit in sequence in a tunnel-like mode, and meanwhile, the movable welding gun device performs corresponding welding; the basic flow of the weldment loader unit is as follows: adjusting a positioning mechanism in real time as required, limiting, aligning, loading a workpiece, pressing, clamping and fixing the workpiece, fixing a welding position, welding a seam, loosening and returning the material; in the first step, the two positioning devices synchronously regulate and control the positions of the limit points corresponding to the outer diameter of the workpiece, simultaneously, the pressing device also arrives at the position correspondingly close to the outer wall of the workpiece so as to be pressed and connected at any time, simultaneously, the positioning device drives the positioning device to enable the joint of the workpiece to be correspondingly placed on the welding support component 5, therefore, in the second step, the workpiece can be directly placed into a welding machine along the welding support component 5, the rolled cylinder workpiece is limited under the surrounding of the limit points and cannot be unfolded outwards, meanwhile, the pressing device also has the limiting function, the pressing position of the pressing device can be pressed and connected to the workpiece nearby, meanwhile, the pressing position can also be directly pressed and connected to the workpiece through the contraction of the limit points, the pressing device has the function of accurately keeping the workpiece in a full circle shape, therefore, two ends of the joint are oppositely combined at the upper end of the welding support component 5 without errors and are pressed and fixed by the welding, if the cylinder workpiece does not keep the correct shape before welding, the welded cylinder finished product of the welding line is easily influenced; meanwhile, the movable welding gun device welds the workpieces of each unit in sequence, the workpieces are kept to continuously pass through the units with the same consumed time, the movable welding gun device continuously operates without overlong standby consumed time, and the working process can be flexibly controlled.

Specifically, in the first step, each limiting part 12 of the two positioning devices is synchronously regulated and controlled to perform radial positioning along the positioning ring 11, the connecting rod 31 and the pressing component 32 move along with the corresponding limiting part 12, and the positioning device drives the positioning ring 11 and the limiting part 12 of the two positioning devices, and the connecting rod 31 and the pressing component 32 of the pressing device to perform lifting and moving together; in the second step, the outer wall of the cylinder workpiece is correspondingly abutted against the limiting part 12, and the pressing component 32 is correspondingly pressed against the outer wall of the cylinder workpiece, so that the workpiece maintains a full-circle shape.

More specifically, in the first step, the positioning device carries the positioning ring 11 to move up and down through the lifter 21, and preferably, a lifting motor 25 drives the two lifters 21 through the commutator 22 to drive the connecting shafts to respectively carry the positioning rings 11 of the two positioning devices, so as to synchronously realize the synchronous lifting of the positioning devices and the pressing device.

Furthermore, the limiting members 12 use the body of the abutting rod 121 as an abutting surface of the limiting point, preferably, the side surfaces of the opposite workpieces of the connecting rod 31 and the abutting rod 121 are flush, in the second step, the cylindrical workpiece is loaded and correspondingly abutted through the abutting rod 121, then the connecting rod 31 abuts, and the limiting members 12 are synchronously narrowed, the connecting rod 31 synchronously clamps the cylindrical workpiece, the pressing group assembly 32 drives the pressing members 322 to press the surface of the cylindrical workpiece with the pressing rods 3222, preferably, the two pressing rods 3222 of each pressing member 322 and the connecting rod 31 between the two pressing rods 3222 form arc-shaped abutting joint with the wall surface of the cylindrical workpiece.

Furthermore, in the second step, when the cylinder workpiece is put in, the welding and supporting component 5 is conveyed to the position of the lining plate 53 through the pusher 55, and the blocking part of the alignment component 33 moves to the axial position corresponding to the rear end of the lining plate 53 to be aligned; in the third step, after the welding is completed, the blocking part of the alignment component 33 is moved away, and the pusher 55 pushes the cylinder workpiece out of the discharge end of the welding support component 5, so as to complete the material returning.

Still further, the movable welding gun device moves along the walking support beam 62, the walking support beam 62 extends along each tunnel type weldment loading unit, and the movable welding gun device can move to each unit along the walking support beam 62.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should be noted that the terms of left, right, upper and lower directions in the embodiments of the present invention are only relative concepts or are referred to the normal use state of the product, and should not be considered as limiting.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments, and the technical effects of the present invention should fall within the protection scope of the present invention as long as the technical effects are achieved by any of the same or similar means.

Claims (10)

1. Tunnel type welding system, its characterized in that: the device comprises a movable welding gun device and at least two tunnel type weldment loading units; the tunnel type weldment loading unit comprises a welding pressing mechanism, a welding supporting assembly and a positioning mechanism; the positioning mechanism comprises a positioning device, a position adjusting device and a position pressing device; the positioning device is provided with a plurality of positioning points which are distributed around the center and can be adjusted; the pressing device is positioned between the two positioning devices, one pressing device is respectively connected with corresponding limiting points on the two positioning devices, the pressing device can move along with the limiting points in a position adjusting way, the pressing device is provided with pressing positions, and at least two pressing positions are distributed around the central axis of the positioning device; the positioning device can synchronously and consistently drive the two positioning devices to lift and move; the welding support component passes through the space between the limit points of the two positioning devices in a suspended mode, the welding pressing mechanism is located above the welding support component, and the welding pressing mechanism can be correspondingly in compression joint with the upper end of the welding support component; the movable welding gun device can move along each tunnel type weldment loading unit correspondingly, and the movable welding gun device is provided with a movable welding gun.

2. The tunnel welding system of claim 1, wherein: the movable welding gun device comprises a walking beam, a walking supporting beam and a movable welding gun mechanism, wherein the walking supporting beam extends along each tunnel type weldment loading unit, the walking beam can be movably arranged on the walking supporting beam along the walking supporting beam, the movable welding gun mechanism is arranged on the walking beam, and the movable welding gun mechanism is provided with a movable welding gun.

3. The tunnel welding system of claim 1 or 2, wherein: the positioning device comprises a positioning ring and limiting pieces, the positioning ring is vertically arranged, the limiting pieces are equidistantly and circumferentially distributed on the positioning ring, each limiting piece can be radially adjusted along the positioning ring, and one end of each limiting piece, opposite to the center of the positioning ring, is a limiting point for abutting against a workpiece; the pressing device comprises a connecting rod and a pressing assembly, the connecting rod is parallel to the central line of the positioning device, two limiting parts corresponding to the two positioning devices are respectively connected with two ends of the connecting rod, and the pressing assembly is arranged on the connecting rod; the welding bearing component passes through the two positioning rings in a suspended mode, and the welding pressing mechanism is located above the welding bearing component between the two positioning rings.

4. The tunnel welding system of claim 3, wherein: the end of the limiting part is provided with a butt-joint rod, the butt-joint rod is parallel to the axis of the positioning ring, one end of the butt-joint rod is arranged on the limiting part and extends outwards, and the outward end of the butt-joint rod extends outwards along the radial direction in an inclined mode.

5. The tunnel welding system of claim 4, wherein: the limiting part is provided with a rod seat used for installing a rod body at the tail end, one side of the rod seat is connected with the limiting part, the rod seat is provided with a recessed port respectively connected with the abutting rod and the connecting rod, and the abutting rod and the connecting rod are flush with one side wall surface of the center of the opposite positioning device.

6. The tunnel welding system of claim 3, wherein: the positioning device also comprises a driving ring which is rotatably arranged on the positioning ring, the driving ring is in spiral transmission connection with the limiting piece, and the limiting piece is in sliding connection with the positioning ring; the locating part is slidably mounted on the sliding groove of the locating ring.

7. The tunnel welding system of claim 1 or 2, wherein: the pressing component comprises a fixed frame, a pressing component and a power cylinder, the fixed frame is fixedly connected with the connecting rod and the power cylinder respectively, and the pressing component is connected with a piston rod of the power cylinder.

8. The tunnel welding system of claim 1 or 2, wherein: the pressing device further comprises an alignment assembly, the alignment assembly is installed on the connecting rod, and the alignment assembly is provided with a movable blocking and connecting portion.

9. The tunnel welding system of claim 1 or 2, wherein: the positioning device comprises lifters, lifting seats for supporting and connecting the positioning devices are arranged on the lifters, each positioning device is connected with one lifter, and the two lifters are driven by a motor or a motor synchronously.

10. The tunnel welding system of claim 1 or 2, wherein: the welding bearing subassembly is longeron subassembly structure, and the one end that the welding bearing subassembly is used for the feeding suspends the setting in midair, and one of the corresponding feeding of welding bearing subassembly is served and is provided with the direction mould.

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