CN218575382U - Adjustable double-tube welding table - Google Patents

Abstract

The utility model discloses an adjustable double-barrelled welding table, treat welding part positioner including desktop, support frame, adjusting device and treat, treat that welding part positioner installs on the desktop, treat that welding part positioner can treat each part of welded and carry out the locking location, the desktop can be located on the support frame around horizontal axis pivoted is articulated, and adjusting device can carry out the locking location to the desktop and the support frame of arbitrary angle, the utility model discloses a desktop is realized treating welding part different welding direction and workman just right around the horizontal axis rotation on the support frame, and the workman need not to carry out the accurate welding to the whole welding position of part around taking welding part transform welding position in welding process, treats that welding part positioner carries out all-round accurate positioning to top tube, low tube and connecting plate, once realizes the synchronous welding of a plurality of parts of cantilever, and welding efficiency is high, no repeated positioning error, and welding precision is high.

Description

Adjustable double-tube welding table

Technical Field

The utility model relates to a welding equipment, in particular to adjustable double-barrelled welding table.

Background

At present, electronic products often need various supports to be installed on a wall surface, for a cantilever-shaped support, a cantilever of the cantilever needs a root size larger than an end size, at present, in order to reduce the cost of the cantilever, the cantilever is generally formed by welding square pipes, two symmetrically bent square pipes are welded together in an overlapping manner at one end, the other ends of the two square pipes form forked support legs, a triangular support structure is integrally formed, in addition, a connecting plate is welded on the side wall of one end of each square pipe, at present, the cantilever is welded by firstly fastening and fixing one square pipe and one connecting plate through a clamp, then welding the two square pipes together to form a semi-finished cantilever, then clamping and positioning the semi-finished product and the other square pipe through the clamp to perform one-end fitting welding of the square pipes, the welding mode consumes time, the two times of positioning are very inconvenient, welding errors can also be generated, and workers need to walk around a welding table board in the welding process to weld in different directions, the welding is very inconvenient, the welding efficiency is low, and the welding size precision is poor.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides an adjustable double-barrelled welding table, this adjustable double-barrelled welding table can adjust the desktop inclination that is used for the location to treat welded part, makes things convenient for the welding, and once fixes a position a plurality of parts and weld in step, and welding precision is high.

The utility model discloses a solve the technical scheme that its technical problem adopted: the utility model provides an adjustable double-barrelled welding table, includes desktop, support frame, adjusting device and treats welding part positioner, treat welding part positioner and install on the desktop, treat that welding part positioner can treat each part of welded and carry out the locking location, on the support frame can be located in the desktop around horizontal rotating shaft pivoted is articulated, adjusting device can carry out the locking location to the desktop and the support frame of arbitrary angle.

As the utility model discloses a further improvement, adjusting device includes positioning gear, meshing piece and drive arrangement, positioning gear and desktop fixed connection, and positioning gear's axis is coaxial with the articulated shaft of desktop and support frame, is equipped with the meshing tooth on the meshing piece, the meshing tooth can be followed positioning gear axial or radial straight line gliding and installed on the support frame, and drive arrangement can drive the motion of meshing piece and make the meshing tooth insert positioning gear teeth inslot, and the meshing tooth inserts positioning gear teeth inslot and can prevent positioning gear to rotate.

As a further improvement, the drive arrangement includes that connecting rod, footboard and elasticity reset, elasticity reset provides the elasticity reset force of orientation and location gear engagement grafting location direction motion for the meshing tine, and connecting rod one end links to each other with the meshing tine is articulated, and the connecting rod other end links to each other with the footboard middle part is articulated, and footboard one end links to each other with the support frame is articulated, and the footboard other end forms the pedal portion that supplies the workman to trample.

As a further improvement, the whole T shape structure that is greater than the lower extreme width of upper end width that is of meshing toothlet, meshing toothlet upper end is formed with a plurality of meshing teeth that match with the positioning gear, and meshing toothlet lower extreme forms vertical guide bar, is equipped with the direction perforation of vertical extension on the support frame, and the vertical guide bar circumferencial direction locking of meshing toothlet lower extreme, and axial can gliding insert locate in the direction perforation, still be equipped with on the support frame with the direction perforation parallel interval set up the elastic component constant head tank, elasticity resets and inserts and locates in the elastic component constant head tank, elasticity reset piece one end is tightly supported the elastic component constant head tank bottom surface, and the elasticity resets the other end tightly supports on the step face between meshing toothlet upper end and the lower extreme.

As a further improvement of the utility model, the support frame is formed with the spacing face of slope respectively along the both sides of desktop rotation direction, desktop lower side surface backstop is in the spacing face surface of support frame.

As a further improvement of the utility model, treat that welded part positioner includes top tube fixing device, low tube fixing device and connecting plate fixing device, top tube fixing device and low tube fixing device can fix top tube and low tube respectively and keep top tube and low tube welding part closely to laminate, and connecting plate fixing device can be at horizontal direction locking positioning connection board and keep the connecting plate upper end closely to laminate with the top tube lower side wall.

As a further improvement of the present invention, the top tube fixing device comprises a plurality of top tube fixing slots fixedly arranged on the desktop, a top tube compressing device and a top tube stopper, the top tubes can be accommodated in each top tube fixing slot, and the inner side wall of each top tube fixing slot is attached to the outer side surface of the circumference of the lower side of the top tube, the top tube compressing device can be mounted on the desktop in a lifting motion along the direction perpendicular to the desktop, the top tube compressing device can tightly support the outer circumferential surface of the upper side of the top tube in the top tube fixing slots, the top tube stopper is fixedly mounted on the desktop, and the top tube stopper can tightly support the axial end face of the welding end of the top tube and the lower tube; the lower pipe fixing device comprises a plurality of lower pipe fixing clamping grooves fixedly arranged on the desktop, a lower pipe pressing device, a lower pipe left stop block and a lower pipe right stop block, the lower pipes can be accommodated in the upper pipe fixing clamping grooves, the inner side walls of the lower pipe fixing clamping grooves are attached to the outer side surfaces of the lower side circumferences of the lower pipes, the lower pipe pressing device can be mounted on the desktop in a lifting motion mode along the direction perpendicular to the desktop, the lower pipe pressing device can tightly abut against the outer side circumferences of the upper sides of the lower pipes in the lower pipe fixing clamping grooves, the lower pipe left stop block and the lower pipe right stop block are fixedly mounted on the desktop, and the lower pipe left stop block and the lower pipe right stop block can respectively tightly abut against the end faces of two axial ends of the lower pipes; the connecting plate fixing device comprises a connecting plate jack perpendicular to the desktop and a bonding force holding device, the connecting plate can be inserted into the connecting plate jack in a linear sliding mode in the direction perpendicular to the desktop, and the bonding force holding device provides holding force for the connecting plate to keep the surface of the lower side of one end of the upper pipe tightly bonded with the lower side surface of the upper pipe.

As a further improvement of the utility model, top tube closing device and low tube closing device include cylinder, briquetting and connection piece respectively, and on the cylinder was fixed in the desktop, the piston rod of cylinder linked to each other with briquetting one end is articulated, and connection piece one end links to each other with the desktop, and the connection piece other end is equipped with along the rectangular shape hinge hole of cylinder piston rod axial extension, the briquetting middle part pass through the articulated shaft with rectangular shape hinge hole can gliding articulated linking to each other, and the briquetting other end can compress tightly top tube and low tube side surface.

As a further improvement of the utility model, laminating power retention device includes spring, bearing and sliding shaft, be formed with sunken holding tank on the connecting plate jack lateral wall, the sliding shaft can follow the gliding installation in sunken holding tank of sunken holding tank depth direction, and the bearing is installed on the sliding shaft, and bearing circumference lateral wall can tightly support the connecting plate lateral wall that is located the connecting plate jack, spring mounting in the sunken holding tank, the spring both ends tightly support sunken holding tank bottom surface and sliding shaft surface respectively.

As a further improvement, still be equipped with spacing backing pin of weld part, backing pin guide block, backing pin fixed block and backing pin lift drive on the desktop, backing pin guide block fixed mounting is in the desktop upside, and the both sides that the backing pin guide block is located top tube and low tube laminating welding position are equipped with at least one direction passageway respectively, and the spacing backing pin of weld part can be followed the gliding inserting of perpendicular to desktop direction and is located in the direction passageway that corresponds, the spacing backing pin lower extreme fixed mounting of weld part is on the backing pin fixed block, backing pin fixed block backstop is in the desktop downside, and backing pin lift drive drives the backing pin fixed block and follows perpendicular to desktop direction elevating movement.

The utility model has the advantages that: the utility model discloses a desktop realizes treating welding parts different welding direction and workman just right around horizontal axis rotation on the support frame, and the workman need not to carry out the accurate welding to the whole welding position of part around taking welding parts transform welding position in welding process, treats that welding parts positioner carries out all-round accurate positioning to top tube, low tube and connecting plate, once realizes the synchronous welding of a plurality of parts of cantilever, and welding efficiency is high, no repeated positioning error, and welding precision is high.

Drawings

Fig. 1 is a first perspective view of the present invention;

FIG. 2 is an enlarged view of part A of bitmap 1;

fig. 3 is a second perspective view of the present invention;

FIG. 4 is an enlarged view of portion B of FIG. 2;

fig. 5 is a front view of the present invention;

FIG. 6 is a sectional view taken along line C-C of FIG. 5;

FIG. 7 is a sectional view showing the positioning gear and the engagement tooth piece in a disengaged state;

FIG. 8 is a cross-sectional view of the tabletop rotated to a positive limit position and occluded prior to rotation;

FIG. 9 is a cross-sectional view of the tabletop after being engaged when the tabletop is rotated to a positive limit state;

FIG. 10 is a cross-sectional view of the tabletop before it is rotated to a reverse limit position and occluded;

FIG. 11 is a cross-sectional view of the tabletop rotated to a reverse limit position and occluded;

FIG. 12 is a view showing the state of the positioning lower tube of the present invention;

FIG. 13 is a cross-sectional view taken along line D-D of FIG. 12;

FIG. 14 is a state diagram of the positioning lower tube, upper tube and connecting plate of the present invention;

FIG. 15 is an enlarged view of portion F of FIG. 14;

FIG. 16 is a sectional view taken along line E-E in FIG. 14;

FIG. 17 is an enlarged view of portion G of FIG. 16;

FIG. 18 is an exploded view of the retention mechanism;

FIG. 19 is a perspective view of the present invention in a horizontal welding state;

FIG. 20 is a perspective view of the present invention in an inboard welding position;

fig. 21 is a perspective view of the present invention in an outside welded state.

Detailed Description

Example (b): the utility model provides an adjustable double-barrelled welding table, includes desktop 1, support frame 2, adjusting device and treats welding part positioner, treat welding part positioner and install on desktop 1, treat that welding part positioner can treat each part of welded and carry out the locking location, desktop 1 can be located support frame 2 around 5 pivoted hinges of horizontal rotating shaft, and adjusting device can carry out the locking location to desktop 1 and support frame 2 to arbitrary angle.

When welding the part of cantilever, the top tube of cantilever, low tube and connecting plate are fully positioned through waiting to weld part positioner, make top tube and low tube correspond at axial position, and keep top tube and low tube closely to laminate, the upper end closely laminates with the connecting plate, then make 1 changes to an appropriate angle of desktop through adjusting device, weld each part one side after the location, then make through adjusting device and rotate 1 to another appropriate angle of desktop, weld each part opposite side after the location, the part is accomplished the welding back, the subassembly that will weld the completion is from waiting to weld part positioner take off can, the device makes the workman can realize the all-round welding of a plurality of sides of subassembly in a position, need not the workman and make a round the work piece switching position, and once fix a position can realize that all parts of cantilever weld and become the subassembly finished product, welding efficiency and welding quality have been improved greatly.

Adjusting device includes positioning gear 3, meshing tooth piece 4 and drive arrangement, positioning gear 3 and 1 fixed connection of desktop, and positioning gear 3's axis is coaxial with desktop 1 and support frame 2's articulated shaft, is equipped with meshing tooth 6 on the meshing tooth piece 4, meshing tooth 6 can be followed 3 axial of positioning gear or radial straight line gliding the installing on support frame 2, and drive arrangement can drive the motion of meshing tooth piece 4 and make meshing tooth 6 insert positioning gear 3's tooth's socket in, and meshing tooth 6 inserts positioning gear 3's tooth's socket and can prevent positioning gear 3 to rotate.

The technical scheme includes that a meshing tooth sheet 4 and a positioning gear 3 are tripped through a driving device, the meshing tooth sheet 4 and the positioning gear 3 are tripped after the table top 1 is rotated, the meshing tooth sheet 4 slides to enable meshing teeth 6 on the meshing tooth sheet to be inserted into or separated from tooth grooves on the positioning gear 3, and then adjustment for preventing the positioning gear 3 from rotating or preventing the positioning gear 3 from freely rotating is achieved, the meshing tooth sheet 4 can slide along the radial direction of the positioning gear 3 to achieve inserting positioning of the meshing teeth 6 and the positioning gear 3, and can also achieve inserting positioning of the meshing teeth 6 and the positioning gear 3 along sliding.

Drive arrangement includes connecting rod 7, footboard 8 and elasticity piece 9 that resets, elasticity piece 9 that resets provides the elasticity that moves towards and 3 meshing grafting location directions of positioning gear for meshing tooth piece 4, and connecting rod 7 one end links to each other with meshing tooth piece 4 is articulated, and the connecting rod 7 other end links to each other with the footboard 8 middle part is articulated, and footboard 8 one end links to each other with support frame 2 is articulated, and the footboard 8 other end forms the pedal portion that supplies the workman to trample. Trample through footboard 8 and rotate around its articulated shaft, and then slide from top to bottom driving connecting rod 7, and then drive meshing tooth piece 4 along positioning gear 3 radial slip, realize positioning gear 3's meshing location or dropout, this simple structure, convenient operation, it is more high-efficient to hand and foot cooperation regulation, also can be other structures in addition, if through hand wheel and lead screw nut mechanism etc..

Meshing tooth piece 4 is whole to be the T shape structure that the upper end width is greater than the lower extreme width, 4 upper ends of meshing tooth piece are formed with a plurality of meshing teeth 6 that match with positioning gear 3, and 4 lower extremes of meshing tooth piece form vertical guide bar, and the last direction that is equipped with vertical extension of support frame 2 is perforated, and the vertical guide bar circumferencial direction locking of 4 lower extremes of meshing tooth piece, and the axial can gliding insert and locate in the direction is perforated, still be equipped with the elastic component constant head tank that sets up with the parallel interval of direction perforation on the support frame 2, elasticity resets 9 inserts and locates in the elastic component constant head tank, elasticity resets 9 one end and tightly supports the elastic component constant head tank bottom surface, and elasticity resets 9 other ends and tightly supports on the step face between 4 upper ends of meshing tooth piece and the lower extreme. Through the setting of elasticity piece 9 that resets for after the workman unclamped footboard 8, meshing tooth piece 4 is automatic to be positioned with the interlock of positioning gear 3, and it is more convenient to operate.

The two sides of the supporting frame 2 along the rotation direction of the desktop 1 are respectively provided with an inclined limiting surface 10, and the lower side surface of the desktop 1 is stopped on the surface of the limiting surface 10 of the supporting frame 2. The limitation of the range of the rotation angle of the desktop 1 is realized through the limiting surface 10, and the collision damage of parts caused by overlarge rotation angle is prevented.

The positioning device for the parts to be welded comprises an upper pipe fixing device, a lower pipe fixing device and a connecting plate fixing device, wherein the upper pipe fixing device and the lower pipe fixing device can respectively fix an upper pipe 31 and a lower pipe 32 and keep the welding part of the upper pipe 31 and the lower pipe 32 tightly attached, and the connecting plate fixing device can stop and position a connecting plate 33 in the horizontal direction and keep the upper end of the connecting plate 33 tightly attached to the lower side wall of the upper pipe.

The upper pipe fixing device comprises a plurality of upper pipe fixing clamping grooves 11 fixedly arranged on the desktop 1, an upper pipe pressing device 12 and upper pipe stoppers 14, the upper pipes can be accommodated in each upper pipe fixing clamping groove 11, the inner side walls of the upper pipe fixing clamping grooves 11 are attached to the outer side surfaces of the circumferences of the lower sides of the upper pipes, the upper pipe pressing device 12 can be mounted on the desktop 1 in a lifting motion along the direction perpendicular to the desktop 1, the upper pipe pressing device 12 can tightly support the outer circumferential surface of the upper side of the upper pipe in the upper pipe fixing clamping grooves 11, the upper pipe stoppers 14 are fixedly mounted on the desktop 1, and the upper pipe stoppers 14 can tightly support the axial end surfaces of the welding ends of the upper pipes and the lower pipes; the lower pipe fixing device comprises a plurality of lower pipe fixing clamping grooves 15 fixedly arranged on the desktop 1, a lower pipe pressing device 16, a lower pipe left stop block 17 and a lower pipe right stop block 18, the lower pipes can be accommodated in the upper pipe fixing clamping grooves 11, the inner side walls of the lower pipe fixing clamping grooves 15 are attached to the outer side surfaces of the lower side circumferences of the lower pipes, the lower pipe pressing device 16 can be mounted on the desktop 1 in a lifting motion mode along the direction perpendicular to the desktop 1, the lower pipe pressing device 16 can tightly abut against the outer side circumferences of the upper sides of the lower pipes in the lower pipe fixing clamping grooves 15, the lower pipe left stop block 17 and the lower pipe right stop block 18 are fixedly mounted on the desktop 1, and the lower pipe left stop block 17 and the lower pipe right stop block 18 can tightly abut against the end faces of the two axial ends of the lower pipes respectively; the connecting plate fixing device comprises a connecting plate jack 19 perpendicular to the desktop 1 and a bonding force holding device, the connecting plate can be inserted into the connecting plate jack 19 in a linear sliding mode along the direction perpendicular to the desktop 1, and the bonding force holding device provides holding force for keeping the connecting plate tightly attached to the lower side surface of one end of the upper pipe.

The device realizes the upper tube, the abundant location of low tube and connecting plate, simultaneously at upper tube and low tube laminating welded one end, can adopt an upper tube closing device 12 to realize that the upper tube compresses tightly with the low tube simultaneously, and guarantee that upper tube and low tube closely laminate, above-mentioned simple structure, can be fully to the upper tube, low tube and connecting plate are fixed a position, in addition also can set up in the recess that upper tube and low tube match on desktop 1, and set up negative pressure air flue or magnetic force actuation device on the recess bottom surface, realize the upper tube, the location of low tube and connecting plate, this kind sees the equivalence alternate structure that this patent structure thinks very easily for technical personnel in the field.

The upper tube pressing device 12 and the lower tube pressing device 16 respectively comprise a cylinder 20, a pressing block 21 and a connecting piece 22, the cylinder 20 is fixed on the desktop 1, a piston rod of the cylinder 20 is hinged to one end of the pressing block 21, one end of the connecting piece 22 is connected with the desktop 1, the other end of the connecting piece 22 is provided with a long-strip-shaped hinge hole extending along the axial direction of the piston rod of the cylinder 20, the middle part of the pressing block 21 is hinged to the long-strip-shaped hinge hole in a sliding mode through a hinge shaft, and the other end of the pressing block 21 can press the upper tube and the upper side surface of the lower tube tightly. When the pressing device with the structure is used for opening the pressing block 21, the pressing block is lifted upwards by a certain height, then overturns, is completely separated from the upper pipe and the lower pipe, is convenient to take down the upper pipe and the lower pipe quickly, and avoids interference.

Laminating power retention device includes spring 23, bearing 24 and sliding shaft 25, be formed with sunken holding tank 26 on the 19 lateral walls of connecting plate jack, sliding shaft 25 can follow the gliding installation in sunken holding tank 26 of sunken holding tank 26 degree of depth direction, and bearing 24 installs on sliding shaft 25, and 24 circumference lateral walls of bearing can tightly support a connecting plate lateral wall that is located connecting plate jack 19, spring 23 install in sunken holding tank 26, spring 23 both ends tightly support sunken holding tank 26 bottom surface and sliding shaft 25 surface respectively. Make bearing 24 outer lane closely laminate with the connecting plate lateral wall all the time through spring 23, bearing 24 is rolling contact with the connecting plate, can not damage the connecting plate lateral wall.

Still be equipped with spacing backing pin 27 of weld part, backing pin guide block 28, backing pin fixed block 29 and backing pin lift drive 30 on the desktop 1, backing pin guide block 28 fixed mounting is in 1 upside of desktop, and the both sides that backing pin guide block 28 is located top tube and low tube laminating welding part are equipped with at least one guide way respectively, and the spacing backing pin 27 of weld part can be followed the gliding of perpendicular to desktop 1 direction and inserted and locate corresponding guide way in, the spacing backing pin 27 lower extreme fixed mounting of weld part is on backing pin fixed block 29, backing pin fixed block 29 backstop is in 1 downside of desktop, and backing pin lift drive 30 drives backing pin fixed block 29 along the 1 direction elevating movement of perpendicular to desktop.

The adoption can go up and down the spacing backing pin 27 of weld part carry on spacingly to top tube and low tube both sides wall, guarantee top tube and low tube perfect alignment back, treat top tube closing device 12 and compress tightly the back with top tube one end, the decline of weld part backing pin breaks away from top tube and low tube welding position, avoids causing the blockking to welding position, avoids influencing the welding effect.

Claims (10)

1. An adjustable double-barrelled welding table which characterized in that: including desktop (1), support frame (2), adjusting device and treat welding part positioner, treat that welding part positioner installs on the desktop, treat that welding part positioner can treat each part of welding and carry out the locking location, the desktop can be located on the support frame around horizontal rotating shaft (5) pivoted is articulated, and adjusting device can carry out the locking location to the desktop of arbitrary angle and support frame.

2. An adjustable dual tube welding table as set forth in claim 1 wherein: adjusting device includes positioning gear (3), meshing tooth piece (4) and drive arrangement, positioning gear and desktop fixed connection, and positioning gear's axis is coaxial with the articulated shaft of desktop and support frame, is equipped with meshing tooth (6) on the meshing tooth piece, the meshing tooth can be followed positioning gear axial or radial straight line gliding and installed on the support frame, and drive arrangement can drive the motion of meshing tooth piece and make the meshing tooth insert positioning gear teeth inslot, and the meshing tooth inserts positioning gear teeth inslot and can prevent positioning gear to rotate.

3. An adjustable dual tube welding table as set forth in claim 2 wherein: drive arrangement includes connecting rod (7), footboard (8) and elasticity piece (9) that resets, elasticity resets and provides the elasticity reset force of orientation and the motion of location gear engagement grafting location direction for the meshing tooth piece, and connecting rod one end links to each other with the meshing tooth piece is articulated, and the connecting rod other end links to each other with the footboard middle part is articulated, and footboard one end links to each other with the support frame is articulated, and the footboard other end forms the pedal portion that supplies the workman to trample.

4. An adjustable dual tube welding table as set forth in claim 3 wherein: the whole T shape structure that is the upper end width and is greater than the lower extreme width that is of meshing toothlet, meshing toothlet upper end is formed with a plurality of meshing teeth that match with positioning gear, and the meshing toothlet lower extreme forms vertical guide bar, is equipped with the direction perforation of vertical extension on the support frame, and the vertical guide bar circumferencial direction locking of meshing toothlet lower extreme, and the axial can be gliding insert locate in the direction perforation, still be equipped with on the support frame with the direction perforation parallel interval set up's elastic component constant head tank, elasticity resets and inserts and locates in the elastic component constant head tank, elasticity resets one end and tightly supports elastic component positioning tank bottom surface, and elasticity resets and tightly supports on the step face between meshing toothlet upper end and the lower extreme the other end.

5. An adjustable dual tube welding table as set forth in claim 1 wherein: the support frame is formed with the spacing face (10) of slope respectively along desktop rotation direction's both sides, the spacing face surface of desktop downside surface backstop in the support frame.

6. An adjustable dual tube welding table as set forth in claim 1 wherein: treat welded part positioner and include top tube fixing device, low tube fixing device and connecting plate fixing device, top tube fixing device and low tube fixing device can fix top tube (31) and low tube (32) respectively and keep top tube and low tube welding part closely laminating, and connecting plate fixing device can be in horizontal direction locking positioning connection board (33) and keep connecting plate upper end and top tube side wall closely laminating.

7. The adjustable dual tube welding table of claim 6, wherein: the upper pipe fixing device comprises a plurality of upper pipe fixing clamping grooves (11), an upper pipe pressing device (12) and an upper pipe stop block (14), the upper pipes are fixedly arranged on the desktop, the upper pipes can be accommodated in the upper pipe fixing clamping grooves, the inner side walls of the upper pipe fixing clamping grooves are attached to the outer side surfaces of the circumferences of the lower sides of the upper pipes, the upper pipe pressing device can be installed on the desktop in a lifting motion mode along the direction perpendicular to the desktop, the upper pipe pressing device can tightly abut against the outer circumferential surfaces of the upper sides of the upper pipes in the upper pipe fixing clamping grooves, the upper pipe stop block is fixedly installed on the desktop, and the upper pipe stop block can tightly abut against the axial end faces of the welding ends of the upper pipes and the lower pipes; the lower pipe fixing device comprises a plurality of lower pipe fixing clamping grooves (15), a lower pipe pressing device (16), a lower pipe left check block (17) and a lower pipe right check block (18), which are fixedly arranged on the desktop, the lower pipes can be accommodated in the upper pipe fixing clamping grooves, the inner side walls of the lower pipe fixing clamping grooves are attached to the outer side surface of the circumference of the lower side of each lower pipe, the lower pipe pressing device can be mounted on the desktop in a lifting motion mode along the direction perpendicular to the desktop, the lower pipe pressing device can tightly abut against the outer circumferential surface of the upper side of each lower pipe in each lower pipe fixing clamping groove, the lower pipe left check block and the lower pipe right check block are fixedly mounted on the desktop, and the lower pipe left check block and the lower pipe right check block can respectively tightly abut against the end faces of the two axial ends of each lower pipe; the connecting plate fixing device comprises a connecting plate jack (19) perpendicular to the desktop and a bonding force holding device, the connecting plate can be inserted into the connecting plate jack in a linear sliding mode in the direction perpendicular to the desktop, and the bonding force holding device provides holding force for keeping the connecting plate closely attached to the lower side surface of one end of the upper pipe.

8. An adjustable dual tube welding table as set forth in claim 7 wherein: the upper tube pressing device and the lower tube pressing device respectively comprise an air cylinder (20), a pressing block (21) and a connecting piece (22), the air cylinder is fixed on the desktop, a piston rod of the air cylinder is hinged to one end of the pressing block, one end of the connecting piece is connected with the desktop, the other end of the connecting piece is provided with a long-strip-shaped hinge hole extending along the axial direction of the piston rod of the air cylinder, the middle part of the pressing block is hinged to the long-strip-shaped hinge hole in a sliding mode through a hinge shaft, and the other end of the pressing block can press the upper tube and the lower tube to form the side surface.

9. An adjustable dual tube welding table as set forth in claim 7 wherein: laminating power retention device includes spring (23), bearing (24) and sliding shaft (25), be formed with sunken holding tank (26) on a connecting plate jack lateral wall, the sliding shaft can follow the gliding installation in sunken holding tank of sunken holding tank depth direction, and the bearing is installed on the sliding shaft, and bearing circumference lateral wall can tightly support a connecting plate lateral wall that is located the connecting plate jack, spring mounting in the sunken holding tank, the spring both ends tightly support sunken holding tank bottom surface and sliding shaft surface respectively.

10. An adjustable double tube welding table as defined in any one of claims 1 to 9 wherein: still be equipped with spacing backing pin of weld part (27), backing pin guide block (28), backing pin fixed block (29) and backing pin lift drive (30) on the desktop, backing pin guide block fixed mounting is in the desktop upside, and the both sides that the backing pin guide block is located top tube and low tube laminating welding position are equipped with at least one guide way respectively, and the spacing backing pin of weld part can be followed the gliding inserting of perpendicular to desktop direction and located in the guide way that corresponds, spacing backing pin lower extreme fixed mounting of weld part is on the backing pin fixed block, backing pin fixed block backstop is in the desktop downside, and backing pin lift drive drives backing pin fixed block and follows perpendicular to desktop direction elevating movement.

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