阅读说明：本技术 用于带钢在线窄搭接拼缝焊机的下焊接轮总成升降装置 (Lower welding wheel assembly lifting device for strip steel on-line narrow lap joint seam welding machine ) 是由 芦洪波 桂敏敏 熊辉 张彦 徐剑 李礼 陈俊 夏思明 王卫强 丁俊涛 梅征 芦 于 2019-08-22 设计创作，主要内容包括：本发明涉及焊接领域,公开了一种用于带钢在线窄搭接拼缝焊机的下焊接轮总成升降装置,包括安装在C型架上的手轮和导向套筒,导向套筒通过外圆周上固定的导套座安装在C型架上,导向套筒内设有导柱,导柱的顶端固定连接有安装有下焊接轮总成的下连接板,导套座上还安装有设置在导柱两侧的两组斜块装置,斜块装置包括安装在下连接板下端的上斜块和可在导套座上水平滑动的下斜块,两个下斜块远离导柱的一端均固定安装在推动板上,推动板另一面设有螺母,推动板上设有与螺母匹配的通孔,手轮连接的梯形丝杆与螺母螺纹连接并穿过通孔。本发明用于带钢在线窄搭接拼缝焊机的下焊接轮总成升降装置,明显改善了各种误差导致的下焊接轮水平度及直线度变化,有效的保持了下焊接轮总成的位置精度及机械结构的稳定性。(The invention relates to the field of welding, and discloses a lower welding wheel assembly lifting device for a strip steel online narrow lap joint seam welding machine, which comprises a hand wheel and a guide sleeve, wherein the hand wheel and the guide sleeve are arranged on a C-shaped frame, the guide sleeve is arranged on the C-shaped frame through a guide sleeve seat fixed on the outer circumference, a guide pillar is arranged in the guide sleeve, the top end of the guide pillar is fixedly connected with a lower connecting plate provided with a lower welding wheel assembly, two groups of inclined block devices arranged on two sides of the guide pillar are also arranged on the guide sleeve seat, each inclined block device comprises an upper inclined block arranged at the lower end of the lower connecting plate and a lower inclined block capable of horizontally sliding on the guide sleeve seat, one ends of the two lower inclined blocks, far away from the guide pillar, are fixedly arranged on a pushing plate, a nut is arranged on the other side of the pushing plate, a through. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welding machine obviously improves the levelness and straightness change of the lower welding wheel caused by various errors, and effectively maintains the position precision of the lower welding wheel assembly and the stability of a mechanical structure.)

1. The utility model provides a lower welding wheel assembly elevating gear that is used for online narrow overlap joint seam welder of belted steel, includes hand wheel (3) of installing on C type frame (1) through bearing (2), its characterized in that: the guide sleeve device is characterized by further comprising a hollow vertical guide sleeve (4), a guide sleeve seat (25) is fixedly welded on the outer circumference of the guide sleeve (4), the guide sleeve seat (25) is fixedly installed on the C-shaped frame (1), a guide pillar (5) is arranged in the guide sleeve (4), the top end of the guide pillar (5) is fixedly connected with a lower connecting plate (7) provided with a lower welding wheel assembly (6), two groups of inclined block devices which are symmetrically arranged on two sides of the guide pillar (5) are further installed on the guide sleeve seat (25), each inclined block device comprises an upper inclined block (8) fixedly installed at the lower end of the lower connecting plate (7) and a lower inclined block (9) capable of horizontally sliding on the guide sleeve seat (25), the bottom surface of the upper inclined block (8) and the top surface of the lower inclined block (9) are inclined planes with the same inclination angle and mutually attached, and one ends, far away from the guide pillar (5), of the two lower inclined blocks (9) are fixedly installed on a vertical pushing plate (10), the improved pushing plate is characterized in that a nut (11) is arranged on the other side of the pushing plate (10), the nut (11) is located at the middle position of the lower inclined block (9), a through hole matched with the nut (11) is formed in the pushing plate (10), and a trapezoidal lead screw (12) connected with a hand wheel (3) is connected with the nut (11) in a threaded mode and penetrates through the through hole.

2. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: go up on the lateral surface of sloping block (8) and medial surface equal fixed mounting have last collude board (13), down the upper portion of sloping block (9) lateral surface and medial surface all be equipped with spacing groove (14) are gone up to sloping block (9) top surface parallel down, go up collude board (13) lower part collude along with go up spacing groove (14) parallel and stretch into go up in spacing groove (14).

3. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: fixed mounting has lower hook plate (15) on guide sleeve seat (25) lateral surface, the lower part of sloping block (9) lateral surface is equipped with horizontally lower spacing groove (16) down, hook on lower hook plate (15) upper portion along with spacing groove (16) are parallel and stretch into down in spacing groove (16).

4. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: a transverse positioning key (17) which is vertically inserted is arranged between the lower connecting plate (7) and the upper inclined block (8), the upper part of the transverse positioning key (17) is positioned in an upper groove formed in the bottom of the lower connecting plate (7), and the lower part of the transverse positioning key (17) is positioned in a lower groove formed in the top of the upper inclined block (8).

5. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: a longitudinal straight guide rail (18) parallel to the motion direction of the lower inclined block is arranged between the lower inclined block (9) and the guide sleeve seat (25), the upper part of the longitudinal straight guide rail (18) is positioned in an upper guide rail groove formed in the bottom of the lower inclined block (9), and the lower part of the longitudinal straight guide rail (18) is positioned in a lower guide rail groove formed in the upper part of the guide sleeve seat (25).

6. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: the inner side wall of the guide sleeve (4) is provided with a rotation limiting device for preventing the guide post (5) from rotating.

7. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 6, characterized in that: the rotation limiting device comprises a vertical long groove (19) formed in the side surface of the guide post (5) inwards and a friction top block (20) attached to the bottom surface of the long groove (19), and the friction top block (20) is fixedly mounted on the inner side wall of the guide sleeve (4).

8. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 7, characterized in that: the friction ejector block (20) is fixedly arranged on the inner side wall of the guide sleeve (4) through a fixing block (21), and the upper end and the lower end of the long groove (19) are respectively spaced from the upper surface and the lower surface of the guide column (5).

9. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: the width of an inclined plane attached between the upper inclined block (8) and the lower inclined block (9) is 50-100 mm, the length of the inclined plane is 400-500 mm, and the inclination of the top surface of the lower inclined block (8) relative to the horizontal plane is 5-10 degrees.

10. The lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welder according to claim 1, characterized in that: the diameter of the guide post (5) is 100-120 mm, the guide post (5) is located on the central line of a lower welding wheel (22) in the lower welding wheel assembly (6), and a guide sleeve (23) is padded between the guide sleeve (4) and the guide post (5).

Technical Field

The invention relates to the field of welding, in particular to a lower welding wheel assembly lifting device for a strip steel online narrow lap joint seam welding machine.

Background

The lifting device of the lower welding wheel assembly in the strip steel on-line narrow lap welding machine is an important component, and the precision of the lifting device directly influences the levelness of the lower welding wheel and the jaw of the clamp of the welding machine and the parallelism of the lower welding wheel and the jaw of the clamp in the welding process, so that the welding quality is influenced.

The welding machine has the problem that the verticality of the lower welding wheel assembly is easy to change in the actual debugging and online operation processes, and the straightness of the lower welding wheel and the jaw is easy to change in the welding process, so that the conductive position of the lower welding wheel is directly deviated. Because the narrow lap welding machine is resistance welding, the deviation of the conductive position directly influences the discharge density I and the lap resistance R of the welding machine, and the formula Q is I according to the welding heating formula²Rt, variations in discharge density I and overlap resistance R can cause thermal instability that affects weld quality.

As shown in fig. 5 and 6, in the conventional lifting device for the lower welding wheel assembly, a hand wheel is manually rotated to drive a spiral lifter to rotate, so that a trapezoidal screw rod matched with the spiral lifter moves up and down, and a lower connecting plate is driven to move up and down, thereby completing the lifting function of the lower welding wheel assembly. The guide device composed of the guide rods and the guide sleeves positioned on the two sides of the trapezoidal screw rod is used for preventing the whole assembly from deflecting and inclining.

However, as shown in fig. 7 and 8, when the upper welding wheel assembly is pressed down during welding, the position of the lower welding wheel assembly is moved down by the pressure, and the larger the welding pressure is, the larger the variation of the downward movement is, and the lower welding wheel is moved down, the smaller the lapping amount is, and the higher the lapping resistance is, and the heat formula Q is I²Rt shows that the overlap resistance R increases and the heat Q also increases, whereas the overlap resistance R decreases and the heat Q also decreases. Therefore, the welding quality of the welding strip is affected due to heat instability caused by the instability of the lap resistance R in the welding process.

On the other hand, because the whole lifting device is mainly completed by the relative movement of the spiral lifter and the trapezoidal screw rod, and the trapezoidal screw rod has a fit clearance, when the pressure of the upper welding wheel presses the lower welding wheel in the operation process of the device, the whole impact force is completely transmitted to the lifting device, as shown in a combined graph of a graph 9 and a graph 10, because the stress of the guide rods on two sides is uneven, the problem that the clearance between the guide rod and the guide sleeve is expanded and the clearance exists between the guide rod and the left side and the right side of the guide sleeve easily occurs after the device operates for a period of time, the lower welding wheel assembly deflects to one side when stressed, the verticality is changed, and in the welding process, the overlap joint quantity of the strip steel is continuously reduced from the operation side to the transmission side due to the pressure extrusion of the upper welding. In the process, the contact area between the upper welding wheel and the lower welding wheel is reduced, the current density is increased, and the heat formula Q is equal to I²The RT can know that: the current density I is increased, the heat Q is also increased, otherwise, the current density I is reduced, the heat Q is also reduced, and the welding quality is influenced by the instability of the heat due to the instability of the current density I in the welding process. Meanwhile, because a gap exists between the guide rod and the guide sleeve in the front and at the back, the verticality of the lower welding wheel assembly is unstable, and the parallelism between the lower welding wheel and the jaw is lowThe lower welding wheel assembly is easy to change, horizontal deflection is easy to occur in the welding process of the lower welding wheel assembly, a welded seam is not a straight line but an irregular curve, the strength and the attractiveness of the welded seam are affected, and once the existing lower welding wheel assembly is displaced and deformed, the levelness and the straightness of the existing lower welding wheel assembly are difficult to adjust through a lifting device.

Therefore, a lifting device capable of ensuring stable position of the lower welding wheel assembly and being adjusted up and down is urgently needed, so that the verticality of the lower welding wheel assembly in the welding process is fixed, the straightness of the lower welding wheel assembly and a jaw is kept good, the discharge position deviation is not formed, and the welding is facilitated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a lower welding wheel assembly lifting device for a strip steel online narrow lap joint seam welding machine, which obviously improves the levelness and straightness change of a lower welding wheel caused by various errors, effectively maintains the position precision and mechanical structure stability of the lower welding wheel assembly, and improves the integral stability of equipment.

In order to achieve the purpose, the invention discloses a lower welding wheel assembly lifting device for a strip steel online narrow lap joint seam welding machine, which comprises a hand wheel and a hollow vertical guide sleeve, wherein the hand wheel is arranged on a C-shaped frame through a bearing, a guide sleeve seat is fixedly welded on the outer circumference of the guide sleeve, the guide sleeve seat is fixedly arranged on the C-shaped frame, a guide post is arranged in the guide sleeve, the top end of the guide post is fixedly connected with a lower connecting plate provided with a lower welding wheel assembly, two groups of inclined block devices symmetrically arranged on two sides of the guide post are also arranged on the guide sleeve seat, each inclined block device comprises an upper inclined block fixedly arranged at the lower end of the lower connecting plate and a lower inclined block capable of horizontally sliding on the guide sleeve seat, the bottom surface of the upper inclined block and the top surface of the lower inclined block are inclined planes with the same inclination angle and mutually attached, the end, far away from the guide pillar, of each of the two lower inclined blocks is fixedly mounted on a vertical pushing plate, a nut is arranged on the other side of the pushing plate and is located in the middle of the two lower inclined blocks, a through hole matched with the nut is formed in the pushing plate, and a trapezoidal lead screw connected with a hand wheel is in threaded connection with the nut and penetrates through the through hole.

Preferably, all fixed mounting has last colluding the board on the lateral surface of going up the sloping block and the medial surface, the upper portion of sloping block lateral surface and medial surface down all be equipped with the parallel last spacing groove of sloping block top surface down, collude along with go up the spacing groove parallel and stretch into in the spacing groove on, through two go up colluding the board and reduce go up the clearance between sloping block and the sloping block down, and prevent that the horizontal deflection takes place for lower welding wheel assembly.

Preferably, fixed mounting has lower colludes the board on the uide bushing seat lateral surface, the lower part of sloping block lateral surface is equipped with the horizontally lower spacing groove down, collude along with lower spacing groove parallel and stretch into down in the spacing groove down collude board upper portion, through collude the board down reduce down the sloping block with the clearance between the uide bushing seat, and prevent that the lower welding wheel assembly from taking place horizontal deflection.

Preferably, a transverse positioning key is vertically inserted between the lower connecting plate and the upper inclined block, the upper part of the transverse positioning key is positioned in an upper groove formed in the bottom of the lower connecting plate, and the lower part of the transverse positioning key is positioned in a lower groove formed in the top of the upper inclined block, so that the lower connecting plate and the upper inclined block are fixed.

Preferably, a longitudinal straight guide rail parallel to the moving direction of the lower inclined block is arranged between the lower inclined block and the guide sleeve seat, the upper part of the longitudinal straight guide rail is positioned in an upper guide rail groove formed in the bottom of the lower inclined block, and the lower part of the longitudinal straight guide rail is positioned in a lower guide rail groove formed in the upper part of the guide sleeve seat, so that the lower inclined block is ensured to move along a straight line.

Preferably, the side wall of the guide sleeve is provided with a rotation limiting device for preventing the guide post from rotating, so that the lower welding wheel assembly is prevented from rotating.

Preferably, the rotation limiting device comprises a vertical long groove with the side surface of the guide post facing inwards and a friction top block attached to the bottom surface of the long groove, the friction top block is fixedly installed on the inner side wall of the guide sleeve, and the friction top block and the bottom surface of the long groove rub against each other to prevent the guide post from rotating.

Preferably, the friction ejector block is fixedly mounted on the inner side wall of the guide sleeve through a fixing block, so that the friction ejector block is conveniently mounted, and the upper end and the lower end of the long groove are respectively spaced from the upper surface and the lower surface of the guide pillar, so that the distance for the guide pillar to move up and down is limited.

Preferably, the width of an inclined plane attached between the upper inclined block and the lower inclined block is 50-100 mm, the length of the inclined plane attached between the upper inclined block and the lower inclined block is 400-500 mm, the contact area is large, no gap exists, and the phenomenon that the position of the lower inclined block moves downwards hardly exists under heavier pressure, so that the position precision of the lower welding wheel assembly can be kept when the upper welding wheel presses downwards, the inclination of the top surface of the lower inclined block relative to the horizontal plane is 5-10 degrees, the angle is ensured to be within the range of the angle of repose, and when the lower welding wheel assembly bears the pressure, the upper inclined block and the lower inclined block do not have the tendency of moving.

Preferably, the diameter of the guide post is 100-120 mm, the guide post is located on a central line of a lower welding wheel in the lower welding wheel assembly, radial stress of the guide post can be reduced, and the deformation resistance of the guide post can be improved, and a guide sleeve is padded between the guide sleeve and the guide post, so that the guide post is further prevented from radial displacement, and deflection in the vertical direction is reduced.

Compared with the prior art, the invention has the following advantages:

1. the assembly is lifted through the relative sliding of the upper inclined block and the lower inclined block, the gap between parts is reduced through the mutual attaching between the upper inclined block and the lower inclined block and the action of the upper hook plate and the lower hook plate, the problem of structural position change of mechanical parts caused by assembly gaps is effectively solved, the problem of change of levelness and straightness of a lower welding wheel caused by various errors is solved, the position precision of the lower welding wheel assembly and the stability of a mechanical structure are effectively maintained, and the integral stability of equipment is improved;

2. because the contact surface between the upper inclined block and the lower inclined block is large and has no gap, the position of the upper inclined block and the lower inclined block hardly moves downwards under the heavy pressure, and the position precision of the lower welding wheel assembly is kept when the upper welding wheel presses downwards;

3. the guide post and guide sleeve devices on two sides are cancelled, a guide post and a guide sleeve which are larger than the former guide post and guide sleeve are arranged along the central line of the lower welding wheel instead, the diameter of the guide post is increased, the position of the guide post is changed, the radial stress of the guide post is reduced, and the deformation resistance of the guide post is improved, so that the stability of a mechanical structure is favorably maintained, the deflection in the vertical direction is reduced, meanwhile, the structure that two groups of inclined block devices are symmetrical relative to the guide post is adopted, the radial force borne by the guide post can be effectively reduced, and the stability;

4. the upper hook plate and the lower hook plate of the inclined block device limit the tendency of the lower welding wheel assembly to rotate around the middle guide post, so that the lower welding wheel assembly cannot generate horizontal deflection and is more stable than the previous design;

5. the heights of the two sides of the lower connecting plate are finely adjusted by adjusting the initial positions of the upper inclined block and the lower inclined block, so that the levelness of the lower welding wheel can be conveniently finely adjusted, and the inclined block device can play a role in amplifying and adjusting the precision, thereby being beneficial to the precision adjustment of the device;

6. the guide pillar is prevented from rotating by the rotation limiting device, so that the lower welding wheel assembly is prevented from rotating, and the structure is more stable;

7. the device has simple structure, convenient operation and more convenient use and maintenance for users.

Drawings

FIG. 1 is a schematic structural diagram of a lower welding wheel assembly lifting device for a strip steel on-line narrow lap joint seam welding machine according to the present invention;

FIG. 2 is a side cross-sectional view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a schematic diagram of a lower welding wheel assembly lifting device according to the prior art;

FIG. 6 is a side view of FIG. 5 of FIG. 1;

FIG. 7 is a schematic view of the lower weld wheel assembly of FIG. 5 shown displaced after the upper weld wheel has been depressed;

FIG. 8 is an enlarged view of I-I in FIG. 7;

FIG. 9 is a schematic view of the lower weld wheel assembly of FIG. 5 after deflection due to a force applied thereto;

fig. 10 is an enlarged view of H-H in fig. 9.

The components in the figures are numbered as follows:

the device comprises a C-shaped frame 1, a bearing 2, a hand wheel 3, a guide sleeve 4, a guide pillar 5, a lower welding wheel assembly 6, a lower connecting plate 7, an upper inclined block 8, a lower inclined block 9, a pushing plate 10, a nut 11, a trapezoidal screw rod 12, an upper hook plate 13, an upper limiting groove 14, a lower hook plate 15, a lower limiting groove 16, a transverse positioning key 17, a longitudinal straight guide rail 18, a long groove 19, a friction jacking block 20, a fixing block 21, a lower welding wheel 22, a guide sleeve 23, a bearing seat 24 and a guide sleeve seat 25.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in figure 1, the lower welding wheel assembly lifting device for the strip steel online narrow lap joint seam welding machine comprises a hand wheel 3 arranged on a C-shaped frame 1 through a bearing 2, and further comprises a hollow vertical guide sleeve 4, a guide sleeve seat 25 is fixedly welded on the outer circumference of the guide sleeve 4, the guide sleeve seat 25 is fixedly arranged on the C-shaped frame 1, a guide post 5 is arranged in the guide sleeve 4, the top end of the guide post 5 is fixedly connected with a lower connecting plate 7 provided with a lower welding wheel assembly 6, two groups of inclined block devices symmetrically arranged on two sides of the guide post 5 are further arranged on the guide sleeve seat 25, and as shown in figure 2, the inclined block devices comprise an upper inclined block 8 fixedly arranged at the lower end of the lower connecting plate 7 and a lower inclined block 9 capable of horizontally sliding on the guide sleeve seat 25, the bottom surface of the upper inclined block 8 and the top surface of the lower inclined block 9 are inclined planes with the same inclination angle, as shown in fig. 3, one ends of the two lower inclined blocks 9, which are far away from the guide pillar 5, are fixedly mounted on a vertical pushing plate 10, a nut 11 is arranged on the other side of the pushing plate 10, the nut 11 is located in the middle of the two lower inclined blocks 9, a through hole matched with the nut 11 is formed in the pushing plate 10, and a trapezoidal screw rod 12 connected with the hand wheel 3 is in threaded connection with the nut 11 and penetrates through the through hole.

As shown in fig. 1 and 2, an upper hook plate 13 is fixedly mounted on both the outer side surface and the inner side surface of the upper inclined block 8, upper limit grooves 14 parallel to the top surface of the lower inclined block 9 are arranged on both the outer side surface and the inner side surface of the lower inclined block 9, hook edges on the lower portion of the upper hook plate 13 are parallel to the upper limit grooves 14 and extend into the upper limit grooves 14, a lower hook plate 15 is fixedly mounted on the outer side surface of the guide sleeve seat 25, a horizontal lower limit groove 16 is arranged on the lower portion of the outer side surface of the lower inclined block 9, and hook edges on the upper portion of the lower hook plate 15 are parallel to the lower limit groove 16 and extend into the lower limit groove 16.

In addition, as shown in fig. 1, a transverse positioning key 17 is vertically inserted between the lower connecting plate 7 and the upper inclined block 8, the upper part of the transverse positioning key 17 is positioned in an upper groove formed at the bottom of the lower connecting plate 7, and the lower part of the transverse positioning key 17 is positioned in a lower groove formed at the top of the upper inclined block 8; as shown in fig. 2, a longitudinal straight guide rail 18 parallel to the moving direction of the lower inclined block is arranged between the lower inclined block 9 and the guide sleeve seat 25, the upper part of the longitudinal straight guide rail 18 is positioned in an upper guide rail groove formed at the bottom of the lower inclined block 9, and the lower part of the longitudinal straight guide rail 18 is positioned in a lower guide rail groove formed at the upper part of the guide sleeve seat 25.

In this embodiment, be equipped with the restricted rotation device who prevents guide pillar 5 pivoted on the inside wall of guide sleeve 4, specifically speaking, as shown in fig. 2, restricted rotation device includes that guide pillar 5 side faces a vertical long recess 19 of interior division and the top piece 20 of rubbing with the laminating of long recess 19 bottom surface, top piece 20 fixed mounting rubs on the inside wall of guide sleeve 4, combine as shown in fig. 4, top piece 20 of rubbing passes through fixed block 21 fixed mounting on the inside wall of guide sleeve 4, the upper end and the lower extreme of long recess 19 leave the distance with the upper surface and the lower surface of guide pillar 5 respectively.

In this embodiment, the width of the bevel face between the upper inclined block 8 and the lower inclined block 9 is 70 mm, the length is 445 mm, the inclination of the top face of the lower inclined block 8 relative to the horizontal plane is 7 degrees, the diameter of the guide post 5 is 105 mm, the guide post 5 is located on the central line of the lower welding wheel 22 in the lower welding wheel assembly 6, and the guide sleeve 23 is padded between the guide sleeve 4 and the guide post 5.

When the device is used, the hand wheel 3 is rotated to drive the trapezoidal screw rod 12 to rotate, the pushing plate 10 is driven to move in the horizontal direction through the nut 11, at the moment, the two lower inclined blocks 9 connected with the pushing plate 10 move synchronously, and the lower connecting plate 7 connected with the upper inclined block 8 rises or falls through the relative sliding of the lower inclined blocks 9 and the upper inclined block 8. In the process, the guide post 5 cannot rotate under the action of the friction top block 20, the lower welding wheel assembly 6 is also ensured not to rotate in the ascending or descending process, and meanwhile, the upper hook plate 13 and the lower hook plate 15 limit the tendency that the lower welding wheel assembly 6 rotates around the middle guide post 5, so that the horizontal deflection cannot occur. During welding, the upper welding wheel is pressed downwards, and because the contact surface between the upper inclined block 8 and the lower inclined block 9 is large, no gap exists, and the phenomenon that the position moves downwards hardly exists under heavier pressure, the position precision of the lower welding wheel assembly 6 is kept when the upper welding wheel is pressed downwards.

The lifting device for the lower welding wheel assembly of the strip steel online narrow lap joint seam welding machine has the advantages that the assembly is lifted through the relative sliding of the upper inclined block 8 and the lower inclined block 9, the gap between parts is reduced through the mutual attaching of the upper inclined block 8 and the lower inclined block 9 and the action of the upper hook plate 13 and the lower hook plate 15, the problem of structural position change of mechanical parts due to assembly gaps is effectively solved, the difficult problem of change of levelness and straightness of the lower welding wheel 22 caused by various errors is solved, the position precision of the lower welding wheel assembly 6 and the stability of a mechanical structure are effectively maintained, and the integral stability of equipment is improved; and because the contact surface between the upper inclined block 8 and the lower inclined block 9 is large and has no clearance, the position of the upper inclined block and the lower inclined block hardly moves downwards under heavier pressure, and the position precision of the lower welding wheel assembly 6 is kept when the upper welding wheel presses downwards.

In addition, the guide post and guide sleeve device at two sides is cancelled, a guide post 5 and a guide sleeve 23 which are larger than the former are arranged along the central line of the lower welding wheel 22 instead, the diameter of the guide post 5 is increased, the position of the guide post 5 is changed, the radial stress of the guide post 5 is reduced, the deformation resistance of the guide post is increased, the stability of the mechanical structure is maintained, the deflection in the vertical direction is reduced, meanwhile, the radial force borne by the guide post 5 can be effectively reduced by adopting a structure that two groups of inclined block devices are symmetrical relative to the guide post 5, the stability of the mechanism is maintained, the trend that the lower welding wheel assembly 6 rotates around the middle guide post 5 is limited through the design of an upper hook plate 13 and a lower hook plate 15 of the inclined block devices, the deflection in the horizontal direction can not occur, the deflection in the horizontal direction is more stable than the former design, the guide post 5 is prevented from rotating through the limitation of the, the structure is more stable.

Moreover, when the device is used, the height of the two sides of the lower connecting plate 7 can be finely adjusted by adjusting the initial positions of the upper inclined block 8 and the lower inclined block 9, the levelness of the lower welding wheel 22 can be finely adjusted conveniently, and the inclined block device can play a role in amplifying and adjusting precision, so that the precision adjustment of the device is facilitated.