CN112157329B

CN112157329B - H-shaped beam longitudinal seam automatic welding machine and welding head

Info

Publication number: CN112157329B
Application number: CN202011013207.4A
Authority: CN
Inventors: 刘帅; 王念磊
Original assignee: Shandong Shuibo Welding And Cutting Equipment Manufacturing Co ltd
Current assignee: Shandong Shuibo Intelligent Equipment Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2022-07-15
Anticipated expiration: 2040-09-23
Also published as: CN112157329A

Abstract

H type roof beam longitudinal joint automatic weld machine and welding head include the mounting bracket, and the one end of mounting bracket is equipped with the sleeve, and the vertical scroll of vertical setting is installed to the sleeve fit in, stretches out telescopic vertical scroll upper end fixedly connected with mounting panel. The invention has the positive effects that: according to the automatic welding machine and the welding head for the H-shaped beam longitudinal seam, the welding piece clamping device and the angle adjusting device which can rotate synchronously are arranged on the vertical shaft of the welding head, the welding piece clamping device can rotate along with the shape of the welding seam while clamping and positioning the welding piece, so that the welding gun on the angle adjusting device can synchronously adjust along with the shape of the welding seam, the normal operation of welding operation is ensured on the premise of no shutdown, the welding efficiency is improved, and the overall welding quality is greatly improved. The rotary encoder on the welding head can also detect the bending angle of the welding line in the welding operation process, and if the bending angle is too large, the advancing speed of the welding head can be reduced, so that the quality of the welding machine is further ensured.

Description

H-shaped beam longitudinal seam automatic welding machine and welding head

Technical Field

The invention relates to the technical field of welding machines, in particular to an automatic welding machine for a longitudinal seam of an H-shaped beam and a welding machine head.

Background

The existing longitudinal seam welding machine can perform high-quality welding on a welding seam with a regular linear shape, but like a gooseneck beam or other irregular weldments, the bent welding seam position generally needs to be stopped to adjust the angle of the welding gun, or is directly welded by manual welding, if the welding seam is welded by manual welding, the welding difficulty of the irregular welding seam is generally large, the labor intensity is obviously improved, if the welding gun position is continuously stopped to be adjusted, the welding efficiency of the welding machine can be reduced, the operation of adjusting the welding gun position back and forth often causes inconsistent integral welding quality, and great troubles are brought to production.

Disclosure of Invention

In order to solve the problems, the invention aims to provide an automatic welding machine for a longitudinal seam of an H-shaped beam and a welding machine head.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a welding head, includes the mounting bracket, and the one end of mounting bracket is equipped with the sleeve, and the vertical scroll of vertical setting is installed to the sleeve fit in, stretches out telescopic vertical scroll upper end fixedly connected with mounting panel, installation welder on the mounting panel still is equipped with rotary encoder on the mounting panel, and the rotary positioning dish is installed to the sleeve upper end, rotary encoder's encoding wheel and rotary positioning dish periphery wall cooperation install weldment clamping device on the vertical scroll of sleeve below.

And an angle adjusting device is arranged on the mounting plate, and a welding gun is arranged on an output shaft of the angle adjusting device through a welding gun clamp. The angle adjusting device comprises a cross sliding table arranged on the mounting plate, a motor and a speed reducer which are coaxially connected are arranged on a sliding plate of the cross sliding table, and an output shaft of the speed reducer is fixedly connected with the welding gun clamp. The welding part clamping device comprises a connecting plate fixed on the vertical shaft, a driving cylinder is hinged to the connecting plate, a rotating plate is hinged to a piston rod of the driving cylinder, one end of the rotating plate is hinged to the vertical shaft, a first clamping wheel is arranged at the bottom of the rotating plate, a second clamping wheel is arranged at the bottom of the vertical shaft, and when the piston rod of the driving cylinder extends out, the first clamping wheel can be opened and closed relative to the second clamping wheel. Two pressing plates are mounted on the vertical shaft at the bottom of the connecting plate, pressing wheels are arranged at the bottoms of the pressing plates, and the rotating plate is hinged between the two pressing plates. The second clamping wheel is eccentrically arranged on the vertical shaft. Be equipped with self-interacting device between mounting panel and the rotary encoder, self-interacting device is including setting up the self-interacting slide rail on the mounting panel, and self-interacting slider is installed in the cooperation on the self-interacting slide rail, and fixed mounting is from the regulating plate on the self-interacting slider, and self-interacting plate stretches out telescopic one end installation rotary encoder, and wherein rotary encoder's encoding wheel adopts magnet to make, and the rotational positioning dish is made by ferromagnetic material, and the encoding wheel has the trend of contact rotational positioning dish periphery wall all the time still install two spacing pins on the regulating plate, the self-interacting slide rail is located between two spacing pins.

An automatic welding machine and a welding head for a longitudinal seam of an H-shaped beam comprise an automatic welding machine and a weldment arranging frame, wherein the automatic welding machine comprises a longitudinal moving slide rail, a longitudinal moving slide plate capable of moving along the longitudinal moving slide rail is arranged on the longitudinal moving slide rail in a matching way, a cross beam is arranged on the longitudinal moving slide plate through a base, the cross beam is positioned at the upper part of the weldment arranging frame, the transverse beam is provided with a transverse slide rail, the transverse slide rail is provided with a transverse slide plate which can move along the transverse slide rail in a matching way, the transverse slide plate is provided with a vertical slide rail, the vertical slide rail is provided with a vertical slide plate which can move along the vertical slide rail in a matching way, the upper end of the transverse moving sliding plate is fixedly provided with a vertical moving driving cylinder, a piston rod of the vertical moving driving cylinder is fixedly connected with the vertical moving sliding plate, still install the welding head on moving the slide vertically, weldment place frame is equipped with a plurality of columns including two longerons that set up side by side on the longeron, all installs on two columns side by side and places the seat.

The welding part fixing device comprises a fixing oil cylinder and a fixing sliding groove which are fixed on the placing seat, a T-shaped sliding block capable of sliding along the fixing sliding groove is installed in the fixing sliding groove in a matched mode, one end, extending out of the fixing sliding groove, of the T-shaped sliding block is provided with a clamping plate, and a piston rod of the fixing oil cylinder is fixedly connected with the clamping plate. Place and install the jacking device on the longeron between the seat, the jacking device includes the vertical jacking cylinder of installing on the longeron, installs the jacking between the jacking cylinder that sets up side by side on the different longerons and changes the roller, the jacking change the roller both ends respectively with one side jacking cylinder's piston rod fixed connection separately, the jacking change the roller with place seat parallel arrangement.

The invention has the positive effects that: according to the automatic welding machine and the welding head for the H-shaped beam longitudinal seam, the welding piece clamping device and the angle adjusting device which can synchronously rotate are arranged on the vertical shaft of the welding head, the welding piece clamping device can rotate along with the shape of the welding seam while clamping and positioning the welding piece, the welding gun on the angle adjusting device can synchronously adjust along with the shape of the welding seam, the normal operation of welding operation is guaranteed on the premise of no shutdown, the welding efficiency is improved, and the overall welding quality is greatly improved. The rotary encoder on the welding head can also detect the bending angle of the welding line in the welding operation process, and if the bending angle is too large, the advancing speed of the welding head can be reduced, so that the quality of the welding machine is further ensured.

Drawings

FIG. 1 is a schematic view of a welding head;

FIG. 2 is a schematic structural view of a weldment clamping arrangement;

FIG. 3 is a schematic structural view of the angle adjusting device;

FIG. 4 is a schematic diagram of the self-adjusting apparatus;

FIG. 5 is a schematic structural view of an automatic welding machine and a welding head for longitudinal seams of H-shaped beams;

FIG. 6 is a schematic view of the construction of an automatic welding machine;

FIG. 7 is a schematic structural view of a weldment setting rack;

FIG. 8 is a schematic structural view of a weldment fastening arrangement;

fig. 9 is a schematic structural view of the jacking device.

In the figure 1, an angle adjusting device 151 of a vertical shaft 14 and a mounting plate 15 of a sleeve 13 of a mounting frame 12 of a welding head 11, a motor 152 of a cross sliding table, a speed reducer, a 16 welding gun clamp, a 17 welding gun, a 19 rotary positioning disc, a 2 welding piece clamping device, a 21 connecting plate, a driving cylinder 23, a rotating plate 24, a pressing plate 25, a pressing wheel 26, a first clamping wheel 27 and a second clamping wheel are arranged on a welding piece 2; 3, self-adjusting device 31 self-adjusts slide rail 32 self-adjusts slide block 33 self-adjusts plate 34 self-limits pin 4 self-welding machine 41 longitudinal slide rail 42 longitudinal slide rail 43 base 44 transverse slide rail 46 transverse slide rail 47 vertical slide rail 48 vertical slide rail 49 vertical slide driving cylinder;

5 weldment placing frame 51 longitudinal beam 52 upright column 53 placing seat 54 fastening oil cylinder 55 fastening sliding groove 56T-shaped sliding block 57 clamping plate 58 jacking oil cylinder 59 jacking roller.

Detailed Description

The invention relates to a welding head 1, as shown in fig. 1, which comprises a mounting frame 11, wherein one end of the mounting frame 11 is provided with a sleeve 12, a vertically arranged vertical shaft 13 is arranged in the sleeve 12 in a matching way, the vertical shaft 13 can rotate in the sleeve 12, the upper end of the vertical shaft 13 extending out of the sleeve 12 is fixedly connected with a mounting plate 14, an angle adjusting device 15 is arranged on the mounting plate 14, a welding gun 17 is arranged on an output shaft of the angle adjusting device 15 through a welding gun clamp 16, and the welding angle of the welding gun 17 can be adjusted according to welding requirements through the angle adjusting device 15 so as to ensure the welding quality of a welding seam, wherein the angle adjusting device 15 can be an angle adjusting mechanism disclosed in China and authorized invention, and the patent number is CN 201510562939.1.

Still be equipped with rotary encoder 18 on mounting panel 14, rotary positioning disk 19 is installed to sleeve 12 upper end, and rotary positioning disk 19 suit is in the vertical scroll 13 periphery, rotary encoder 18's code wheel and rotary positioning disk 19 periphery wall keep the contact all the time, can record the pivoted angle size of vertical scroll 13 among the welding process, if the vertical scroll 13 turned angle who records is too big, it is too big to show the angle of buckling of welding seam here position, and rotary encoder 18 sends the signal of telecommunication to control center, reduces welding travel speed of welding aircraft nose 1 to ensure the welding precision of this department's position of buckling welding seam.

A vertical shaft 13 at the lower end of a sleeve 12 is provided with a weldment clamping device 2, the weldment clamping device 2 can fixedly clamp a weldment and can also follow the shape of a weld joint to generate free follow-up, the weldment clamping device 2 and a welding gun 17 are both fixedly arranged on the vertical shaft 13, and when the weldment clamping device 2 follows up, the welding gun 17 generates rotation adjustment along with the weld joint, so that automatic tracking of the weld joint is realized, and welding quality is achieved. The weldment clamping device 2 comprises a first clamping wheel 26 and a second clamping wheel 27, wheel carriers of the first clamping wheel 26 and the second clamping wheel 27 are mounted on a lead screw nut mechanism, so that the distance between the first clamping wheel 26 and the second clamping wheel 27 can be adjusted through the lead screw nut mechanism, and the first clamping wheel 26 and the second clamping wheel 27 clamp or loosen a vertical wing plate of an H-shaped beam of a workpiece.

As shown in FIG. 2, the weldment clamping device 2 comprises a connecting plate 21 fixed on a vertical shaft 13, a driving cylinder 22 is hinged on the connecting plate 21, a piston rod of the driving cylinder 22 is hinged with a rotating plate 23, two pressing plates 24 are mounted on the vertical shaft 13 at the bottom of the connecting plate 21, pressing wheels 25 are arranged at the bottoms of the pressing plates 24, the rotating plate 23 is hinged between the two pressing plates 24, a first clamping wheel 26 is arranged at the bottom of the rotating plate 23, a second clamping wheel 27 is arranged at the bottom of the vertical shaft 13, and when the piston rod of the driving cylinder 22 extends out, the first clamping wheel 26 can be matched with the second clamping wheel 27 to clamp and position a workpiece. Wherein the pinch roller 25 is positioned at the upper part of the welding part wing plate and is compressed, the first clamping wheel 26 and the second clamping wheel 27 are respectively positioned at the two sides of the welding part wing plate to clamp and position the welding part, and meanwhile, the welding part clamping device 2 can follow the shape of the welding part.

In order to facilitate adjustment of the welding angle position of the welding gun 17, as shown in fig. 3, the angle adjusting device 15 includes a cross sliding table 151 disposed on the mounting plate 14, a sliding plate of the cross sliding table 151 is provided with a motor 152 and a speed reducer 153 which are coaxially connected, and an output shaft of the speed reducer 153 is fixedly connected with the welding gun clamp 16. Before welding, the position of the welding gun 17 can be adjusted by manually adjusting the cross sliding table 151, and the motor 152 is started to adjust the angle position between the welding gun 17 and the welding seam, so that the welding gun 17 is ensured to align with the welding seam for welding operation, and the overall welding quality is improved.

If the initial machining precision of the rotary positioning disk 19 is insufficient, or if the rotary positioning disk 19 is worn after a period of use, the encoder wheels of the rotary encoder 18, which are fixedly installed relative to each other, may be pressed against each other or may not contact each other during the rotation around the rotary positioning disk 19, resulting in inaccurate angle calculation, in order to ensure that the encoder wheels of the rotary encoder 18 can always contact and rotate around the rotary positioning disk 19 during the welding process, as shown in fig. 4, a self-adjusting device 3 is provided between the mounting plate 14 and the rotary encoder 18, the self-adjusting device 3 includes a self-adjusting slide rail 31 provided on the mounting plate 14, a self-adjusting slide block 32 is cooperatively installed on the self-adjusting slide rail 31, a self-adjusting plate 33 is fixedly installed on the self-adjusting slide block 32, the rotary encoder 18 is installed at an end of the self-adjusting plate 33 extending out of the sleeve 12, wherein the encoder wheels of the rotary encoder 18 are made of magnets, the rotating positioning disk 19 is made of ferromagnetic material and the encoder wheel always tends to contact the peripheral wall of the rotating positioning disk 19.

The initial machining precision of the rotary positioning disc 19 and the abrasion degree after the rotary positioning disc is used for a period of time can be omitted due to the design, and under the distance adaptive adjustment and the magnetic attraction effect of the self-adjusting device 3, the coding wheel can be always in contact with the outer peripheral wall of the rotary positioning disc 19 and rotates along with bending of a welding piece, so that the accuracy of angle calculation of the rotary encoder 18 is ensured. Two limit pins 34 are further installed on the self-adjusting plate 33, and the self-adjusting slide rail 31 is located between the two limit pins 34 so as to limit the movable range of the rotary encoder 18 while avoiding the self-adjusting slide rail 31 from being disengaged from the self-adjusting slider 32.

The automatic welding machine for the longitudinal seam of the H-shaped beam and the welding head provided with the welding head 1 are shown in fig. 5 and comprise an automatic welding machine 4 and a weldment arranging frame 5, wherein the weldment arranging frame 5 is used for arranging a weldment to be welded, and the automatic welding machine 4 is used for welding the weldment. As shown in fig. 6, the automatic welding machine 4 includes a longitudinal slide rail 41, a longitudinal slide plate 42 capable of moving along the longitudinal slide rail 41 is installed on the longitudinal slide rail 41 in a matching manner, a cross beam 44 is installed on the longitudinal slide plate 42 through a base 43, the cross beam 44 is located on the upper portion of the weldment setting frame 5, a cross slide rail 45 is installed on the cross beam 44, a transverse slide plate 46 capable of moving along the cross slide rail 45 is installed on the cross slide rail 45 in a matching manner, a vertical slide rail 47 is installed on the transverse slide plate 46, a vertical slide plate 48 capable of moving along the vertical slide rail 47 is installed on the vertical slide rail 47 in a matching manner, a vertical movement driving cylinder 49 is fixedly installed at the upper end of the transverse slide plate 46, a piston rod of the vertical movement driving cylinder 49 is fixedly connected with the vertical movement slide plate 48, and a welding head 1 is also installed on the vertical movement slide plate 48. The longitudinal sliding plate 42 can move on the longitudinal sliding rail 41 to adjust the longitudinal position of the welding head 1 relative to the weldment, the transverse sliding plate 46 can move on the transverse sliding rail 45 to adjust the transverse position of the welding head 1 relative to the weldment, and the vertical sliding plate 48 can move on the vertical sliding rail 47 to adjust the vertical position of the welding head 1 relative to the weldment, so that the position of the welding head 1 can be adjusted in space to be aligned with the weld to perform accurate welding operation.

As shown in fig. 7, the weldment setting frame 5 includes two longitudinal beams 51 arranged side by side, a plurality of columns 52 are arranged on the longitudinal beams 51, a setting seat 53 is mounted on each of the two parallel columns 52, and the weldment to be welded is located on the setting seat 53.

When the automatic welding machine for the longitudinal seam of the H-shaped beam and the welding head are used for welding operation, firstly, a weldment is transferred to the placing seat 53 on the weldment placing frame 5, the position of the transverse moving sliding plate 46 on the transverse sliding rail 45 and the position of the vertical moving sliding plate 48 on the vertical moving sliding rail 47 are adjusted, so that the welding head 1 is aligned with the welding seam, then the longitudinal moving sliding plate 42 moves on the longitudinal moving sliding rail 41, the transverse beam 44 on the longitudinal moving sliding plate and the welding head 1 are driven to longitudinally move together, the welding head 1 can continuously weld along the length direction of the weldment, free follow-up can be generated according to the shape of the weldment, and the welding accuracy of the whole welding operation is ensured.

Further, in order to fix the weldment on the weldment setting frame 5, the welding operation of the weldment is completed by moving the welding head 1, the weldment fastening devices are installed at the positions of the two ends of the side surface of the placing seat 53, as shown in fig. 8, each weldment fastening device comprises a fastening oil cylinder 54 and a fastening sliding groove 55 which are fixed on the placing seat 53, a T-shaped sliding block 56 which can slide along the fastening sliding groove 55 is installed in the fastening sliding groove 55 in a matching manner, a clamping plate 57 is installed at one end, extending out of the fastening sliding groove 55, of the T-shaped sliding block 56, and a piston rod of the fastening oil cylinder 54 is fixedly connected with the clamping plate 57. When the piston rods of the fastening cylinders 54 at both ends retract, the clamping plates 57 can clamp and fix the weldments on the placing seats 53.

Further, in order to facilitate taking out the welded workpiece after welding from the workpiece placement frame 5, a jacking device is installed on the longitudinal beam 51 between the placement seats 53, as shown in fig. 9, the jacking device comprises jacking oil cylinders 58 vertically installed on the longitudinal beam 51, jacking rotating rollers 59 are installed between the jacking oil cylinders 58 arranged side by side on different longitudinal beams 51, two ends of each jacking rotating roller 59 are fixedly connected with piston rods of the jacking oil cylinders 58 on one side respectively, and the jacking rotating rollers 59 are arranged in parallel with the placement seats 53. When the piston rod of the jacking oil cylinder 58 extends out, the jacking rotary roller 59 rises along with the piston rod, and can drive the weldment on the placing seat 53 to be separated from the weldment placing frame 5, so that the subsequent movement and transfer of the weldment are facilitated.

The technical solution of the present invention is not limited to the scope of the embodiments of the present invention. The technical contents not described in detail in the present invention are all known techniques.

Claims

1. A welding head, characterized by: the welding fixture comprises an installation frame (11), wherein a sleeve (12) is arranged at one end of the installation frame (11), a vertically arranged vertical shaft (13) is installed in the sleeve (12) in a matched manner, an installation plate (14) is fixedly connected to the upper end of the vertical shaft (13) extending out of the sleeve (12), an angle adjusting device (15) is arranged on the installation plate (14), a welding gun (17) is installed on an output shaft of the angle adjusting device (15) through a welding gun clamp (16), a rotary encoder (18) is further arranged on the installation plate (14), a rotary positioning disc (19) is installed at the upper end of the sleeve (12), an encoding wheel of the rotary encoder (18) is matched with the outer peripheral wall of the rotary positioning disc (19), a welding fixture (2) is installed on the vertical shaft (13) below the sleeve (12), the welding fixture (2) comprises a first clamping wheel (26) and a second clamping wheel (27), the welding fixture (2) comprises a connecting plate (21) fixed on the vertical shaft (13), a driving cylinder (22) is hinged to the connecting plate (21), a rotating plate (23) is hinged to a piston rod of the driving cylinder (22), one end of the rotating plate (23) is hinged to the vertical shaft (13), a first clamping wheel (26) is arranged at the bottom of the rotating plate (23), a second clamping wheel (27) is arranged at the bottom of the vertical shaft (13), and when the piston rod of the driving cylinder (22) extends out, the first clamping wheel (26) can be opened and closed relative to the second clamping wheel (27).

2. A welding head according to claim 1, characterized in that: angle adjusting device (15) are including setting up cross slip table (151) on mounting panel (14), install coaxial motor (152) and speed reducer (153) that link to each other on the slide of cross slip table (151), the output shaft and the welder clamp (16) fixed connection of speed reducer (153).

3. A welding head according to claim 1, characterized in that: the connecting plate (21) is fixed at the bottom of the vertical shaft (13), two pressing plates (24) are mounted on the vertical shaft (13), pressing wheels (25) are arranged at the bottoms of the pressing plates (24), and the rotating plate (23) is hinged between the two pressing plates (24).

4. A welding head according to claim 1, characterized in that: the second clamping wheel (27) is eccentrically arranged on the vertical shaft (13).

5. A welding head according to claim 1, characterized in that: be equipped with between mounting panel (14) and rotary encoder (18) from adjusting device (3), from adjusting device (3) including setting up self-adjusting slide rail (31) on mounting panel (14), self-adjusting slide rail (31) are gone up the cooperation and are installed from adjusting slider (32), fixed mounting is from adjusting plate (33) on self-adjusting slider (32), stretch out one end installation rotary encoder (18) of sleeve (12) from adjusting plate (33), wherein the encoding wheel of rotary encoder (18) adopts magnet to make, rotary positioning dish (19) are made by ferromagnetic material, the encoding wheel has the trend of contact rotary positioning dish (19) periphery wall all the time still install two spacing pins (34) on adjusting plate (33), self-adjusting slide rail (31) are located between two spacing pins (34).

6. The utility model provides a H type roof beam longitudinal joint automatic weld machine which characterized in that: the automatic welding machine (4) comprises a welding head (1), an automatic welding machine (4) and a weldment arranging frame (5) as claimed in claim 1, wherein the automatic welding machine (4) comprises a longitudinal moving slide rail (41), a longitudinal moving slide plate (42) capable of moving along the longitudinal moving slide rail is installed on the longitudinal moving slide rail (41) in a matched mode, a cross beam (44) is installed on the longitudinal moving slide plate (42) through a base (43), the cross beam (44) is located on the upper portion of the weldment arranging frame (5), a transverse slide rail (45) is installed on the cross beam (44), a transverse slide plate (46) capable of moving along the transverse slide rail (45) is installed on the transverse slide rail (45) in a matched mode, a vertical moving slide rail (47) is installed on the transverse slide rail (46), a vertical moving slide plate (48) capable of moving along the transverse slide rail is installed on the vertical moving slide rail (47) in a matched mode, a vertical moving driving cylinder (49) is fixedly installed at the upper end of the transverse slide plate (46), a piston rod of the vertical moving driving cylinder (49) is fixedly connected with the vertical moving slide plate (48), the welding machine head (1) is installed on the vertically-moving sliding plate (48), the weldment placing frame (5) comprises two longitudinal beams (51) which are arranged side by side, a plurality of columns (52) are arranged on the longitudinal beams (51), and placing seats (53) are installed on the two parallel columns (52).

7. The automatic welding machine for the longitudinal seam of the H-shaped beam as claimed in claim 6, wherein: the welding part fixing device is characterized in that the positions of two ends of the side face of the placing seat (53) are respectively provided with a welding part fixing device, the welding part fixing device comprises a fixing oil cylinder (54) and a fixing sliding groove (55) which are fixed on the placing seat (53), a T-shaped sliding block (56) which can slide along the fixing sliding groove (55) is installed in the fixing sliding groove (55) in a matched mode, one end, extending out of the fixing sliding groove (55), of the T-shaped sliding block (56) is provided with a clamping plate (57), and a piston rod of the fixing oil cylinder (54) is fixedly connected with the clamping plate (57).

8. The automatic welding machine for the longitudinal seam of the H-shaped beam as claimed in claim 6, wherein: the jacking device is installed on longitudinal beams (51) between the placing seats (53), comprises jacking oil cylinders (58) vertically installed on the longitudinal beams (51), jacking rotary rollers (59) are installed between the jacking oil cylinders (58) arranged on different longitudinal beams (51) side by side, two ends of each jacking rotary roller (59) are fixedly connected with piston rods of the jacking oil cylinders (58) on one side respectively, and the jacking rotary rollers (59) are arranged in parallel with the placing seats (53).