CN116618939A - A kind of H-shaped steel welding device - Google Patents

Abstract

The application discloses an H-shaped steel welding device, which comprises a base, wherein a second motor is arranged in the base, the output end of the second motor is fixedly connected with a second screw rod, and the middle part of the second screw rod is penetrated by and in threaded connection with two third sliding blocks and two fourth sliding blocks; two rotating rods which are symmetrically arranged are rotationally connected to the lifting seat, one end of each rotating rod, which is far away from the lifting seat, is rotationally connected with a fourth sliding block, a turnover mechanism is arranged on the lifting seat, and the lifting seat turns the web of the H-shaped steel by 180 degrees through the turnover mechanism and drives the web of the H-shaped steel to move up and down; the clamping devices are respectively arranged at two sides of the lifting seat and fix the flange plate of the H-shaped steel through the second clamping blocks; the clamping devices on two sides are respectively and fixedly connected with the third sliding block through connecting rods. According to the application, when the turnover mechanism drives the H-shaped steel to rotate, the clamping device does not interfere the turnover of the H-shaped steel, so that the turnover of the H-shaped steel is realized, the operation is simple and convenient, and the welding machine efficiency of the H-shaped steel is improved.

Description

A kind of H-shaped steel welding device

technical field

The invention relates to the technical field of H-shaped steel welding, in particular to an H-shaped steel welding device.

Background technique

H-shaped steel is an economical cross-section high-efficiency profile with more optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. It is named because its cross-section is the same as the English letter "H". Since all parts of the H-shaped steel are arranged at right angles, the H-shaped steel has the advantages of strong bending resistance in all directions, simple construction, cost saving and light structural weight, and has been widely used.

The traditional H-shaped steel needs to weld the web and flange of the H-shaped steel together. Although the current H-shaped steel can be welded, it also has many shortcomings: it is not convenient to weld the upper and lower surfaces of the web, and manual welding is required during the welding process. Flip the web over, resulting in slower welding efficiency. For example, a kind of H-shaped steel welding device disclosed by Chinese Patent Publication No. CN 217832448U fixes the flange plate through a U-shaped groove, places a web plate on the placement platform, and adjusts the relative distance of the sliding plate so that the flange plate is butted. The web, and then the upper surface of the web and the flange plate are welded together, but it needs to be turned over by manpower, and then the other side of the web and the flange plate are welded together by the welding torch above the H-shaped steel, so that the H The welding process of section steel is time-consuming and laborious, and the welding efficiency is low.

Contents of the invention

The purpose of the present invention is to improve and innovate on the shortcomings and problems existing in the background technology, to provide a kind of H-shaped steel welding device, comprising:

A base, a second motor is installed in the base, the output end of the second motor is fixedly connected with a second screw rod, and two third sliders and two fourth sliders run through the middle of the second screw rod and threaded connection with it;

Lifting seat, two symmetrically arranged rotating rods are rotatably connected to the lifting seat, and the end of the rotating rod away from the lifting seat is rotatably connected to a fourth slider. The lifting seat is provided with a turning mechanism. The mechanism turns the web of the H-shaped steel 180° and drives the web of the H-shaped steel to move up and down;

Clamping device, the clamping device is located on both sides of the lifting seat, the clamping device includes two second clamping blocks and a driving mechanism, and the driving mechanism is used to drive the two second clamping blocks to move back or face each other movement, so that the second clamping block fixes the flange plate of the H-shaped steel; the clamping devices on both sides are respectively fixedly connected with the third sliding block through connecting rods.

It can be seen from the above technical solution that the application uses the second motor to drive the second screw to rotate, which can drive the two third sliders to move in opposite directions and the two fourth sliders to move in opposite directions, so as to facilitate the flange plate and web of the H-shaped steel The plates are spliced together to facilitate the welding of the upper surface of the web and the flange plate; when the two second clamping blocks are driven to move away from each other so that the second clamping block is separated from the flange plate by a certain distance, the second motor Driving the second screw rod to rotate in the opposite direction can drive the two third sliders to move opposite to each other and the two fourth sliders to move towards each other, so that the bottom end of the flange plate is separated from the second clamping block and the clamping device is kept away from the flange Plate, when the turning mechanism drives the H-beam to rotate, the clamping device will not interfere with the turning of the H-beam, thereby realizing the turning of the H-beam, which is easy to operate and improves the efficiency of the welding machine of the H-beam; in addition, as mentioned above, the clip The holding device will not interfere with the turning of the H-shaped steel, so that the second motor drives the second screw to rotate, and can simultaneously drive the two third sliders and the two fourth sliders to move relative to each other. Compared with using different mechanisms to drive separately The third sliding block and the fourth sliding block move relative to each other, which makes the operation of the application more convenient and saves the purchase cost of the equipment at the same time.

A further solution is that the turning mechanism includes a mirror-symmetrical support base, a roller, a gear, a ring gear and a first clamping block, and the support base is slidably arranged on the lifting base, and a fifth Slider, the middle part of the fifth slider is inserted with a third screw rod and threadedly connected with it, one end of the third screw rod is fixedly connected with the output end of the fourth motor, one end of the roller is rotatably matched with the support seat, The end of the drum is provided with a second annular bump, on which a number of protruding rods are installed at intervals, and the protruding rods are adapted to the annular limit grooves provided inside the support seat, and the ring gear is arranged on the On the outer surface, the ring gear is meshed with the gear, and the gear is driven to rotate by the third motor installed on the support base. The two first clamping blocks are arranged on the inner side of the drum and are oppositely arranged. The end of the drum away from the support base is provided with a The groove through which the web of the steel section passes.

It can be seen from the above technical solution that the application uses the fourth motor to drive the fifth slider to move relative to each other, which can drive the two support seats to move relative to each other. It can drive the relative movement of the roller, so that the first clamping block moves relatively and clamps the web of the H-shaped steel. At this time, the ring gears on the two supporting seats are abutted together to form a complete whole, so that the gear and the ring gear mesh and cooperate. , it can drive the H-shaped steel to turn over.

A further solution is that a first annular protrusion is installed on the outer surface of the drum, and the first annular protrusion is rotatably engaged with a roller, and the roller is rotatably connected to the support seat through a bearing.

A further solution is that the clamping device includes a fixed seat, and the fixed seat is fixedly connected with the connecting rod, and the driving mechanism includes a fourth threaded rod that is rotatably connected to the fixed seat, and the middle part of the fourth threaded rod passes through the second clip. The block is threadedly connected with it, and the upper end of the second clamping block passes through the fixing seat and is slidably fitted with it.

A further solution is that a bracket is installed on the base, and an actuator is arranged on the bracket, and the actuator at least includes an electric telescopic rod, and a welding torch is fixedly connected to the telescopic end of the electric telescopic rod, and the electric telescopic rod is used for Drive the welding torch to move up and down.

A further solution is that the actuator includes two first support plates, the first support plates are rotatably connected to a first screw, and one end of the first screw is fixedly connected to the output end of the first motor, The first motor is installed on the first support plate, the middle part of the first screw rod passes through the second slider and is screwed with it, the electric telescopic rod is installed on the second slider, and the middle part of the first screw rod The axis is parallel to the web length direction of the H-beam.

A further solution is that the support includes two oppositely arranged side plates and a top plate arranged between the two side plates, an air cylinder is installed on the side plates, and the output end of the air cylinder is fixedly connected with a first slider, so that The upper surface of the first slider is slidingly matched with the top plate, and the lower surface of the first slider is installed with the first support plate.

A further solution is that the thread directions of the internal threads on the two third sliders are opposite, and the threads of the internal threads on the two fourth sliders are opposite.

A further solution is that a rubber pad is arranged on the second clamping block.

A further solution is that a rubber pad is provided on the first clamping block.

Compared with the prior art, the beneficial effects of the present invention are: (1) the application drives the second screw mandrel to rotate through the second motor, which can drive the two third sliders to move toward each other and the two fourth sliders to move away from each other , it is convenient to splice the flange plate and the web of the H-shaped steel together, and it is convenient to weld the upper surface of the web and the flange plate together; when the two second clamping blocks are driven to move away, the second clamping block and the wing After the flange plates are separated by a certain distance, the second motor drives the second screw rod to rotate in the opposite direction, which can drive the two third sliders to move away from each other and the two fourth sliders to move towards each other, so that the bottom end of the flange plate is separated from the first The second clamp block and the clamping device are kept away from the flange plate. When the turning mechanism drives the H-shaped steel to rotate, the clamping device will not interfere with the turning of the H-shaped steel, thereby realizing the turning of the H-shaped steel. The operation is simple and the welding of the H-shaped steel is improved. Machine efficiency; In addition, as mentioned above, the clamping device will not interfere with the turning of the H-shaped steel, so that the second motor drives the second screw to rotate, and can simultaneously drive the two third sliders and the two fourth sliders relative to each other. Compared with using different mechanisms to respectively drive the relative movement of the third slider and the fourth slider, the operation of this application is more convenient, and at the same time, the purchase cost of the equipment is saved;

(2) The application uses the fourth motor to drive the fifth slider to move relative to each other, which can drive the two support seats to move relative to each other. Since the protruding rod on the roller matches the annular limit groove provided on the support seat, it can drive the roller The relative movement makes the first clamping block move relatively to clamp the web of the H-shaped steel. At this time, the ring gears on the two supporting seats abut together to form a complete whole, so that when the gear and the ring gear mesh and cooperate, they can Drive the H-shaped steel to turn over.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a kind of H-shaped steel welding device structure schematic diagram provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the front view of the turning mechanism and the clamping device provided by the embodiment of the present invention;

Fig. 3 is a side view structural schematic diagram of the turning mechanism provided by the embodiment of the present invention;

FIG. 4 is a schematic diagram of a partially enlarged structure at A in FIG. 2 provided by an embodiment of the present invention;

Fig. 5 is a schematic side view structural diagram of the actuator provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of a cross-sectional structure of a support seat provided by an embodiment of the present invention;

Fig. 7 is a second schematic diagram of the cross-sectional structure of the support seat provided by the embodiment of the present invention;

Reference signs: base 1, bracket 2, cylinder 3, first slider 4, first support plate 5, first motor 6, first screw rod 7, second slider 8, electric telescopic rod 9, welding torch 10, The second motor 11, the second screw mandrel 12, the third slider 13, the fourth slider 14, the rotating rod 15, the connecting rod 16, the lifting seat 17, the supporting seat 18, the roller 19, the first clamping block 20, the groove 21. The third motor 22, the gear 23, the ring gear 24, the first annular bump 25, the roller 26, the second support plate 27, the fourth motor 28, the fifth slider 29, the third screw rod 30, and the fixing seat 31 , the fourth screw rod 32 , the second clamping block 33 , the second annular protrusion 1901 , the protruding rod 1902 , and the annular limiting groove 1801 .

Detailed ways

In order to make the purpose, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to Fig. 1-Fig. 7, the present invention provides a kind of H-shaped steel welding device, comprising:

Base 1, a second motor 11 is installed in the base 1, the output end of the second motor 11 is fixedly connected with a second screw 12, and the middle part of the second screw 12 is penetrated with two third sliders 13 And two fourth slide blocks 14 and threaded connection with it, the thread direction of the internal thread on the two third slide blocks 13 is opposite, the thread direction of the internal thread on the two fourth slide blocks 14 is opposite, when the second motor 11 drives When the second screw mandrel 12 rotates, it will drive the two third sliders 13 to move away from each other or move towards each other and drive the two fourth sliders 14 to move away from each other or towards each other;

Lifting seat 17, two rotating rods 15 arranged symmetrically are rotatably connected on the lifting seat 17, and the end of the rotating rod 15 away from the lifting seat 17 is rotatably connected with a fourth slide block 14, and the lifting seat 17 is provided with a turning mechanism , the lifting seat 17 turns over the web of the H-shaped steel by 180° through the turning mechanism, and when the fourth slider 14 moves away from each other or moves in the opposite direction, it will drive the lifting seat 17 to move up and down, thereby driving the web of the H-shaped steel to move up and down ;

Clamping device, the clamping device is located on both sides of the lifting seat 17, the clamping device includes two second clamping blocks 33 and a driving mechanism, and the driving mechanism is used to drive the two second clamping blocks 33 facing away from each other movement or opposite movement, so that the second clamping block 33 fixes the flange plate of the H-shaped steel; the clamping devices on both sides are fixedly connected with the third slider 13 through the connecting rod 16 respectively, when the third slider 13 moves away from each other or When moving towards each other, it will drive the clamping device to move back or towards each other, thereby driving the flange plate of the H-shaped steel to move relatively, which is convenient for splicing the flange plate and the web of the H-shaped steel together.

It can be understood that when the upper surface of the web of the H-shaped steel and the flange plate are welded together; at this time, the two second clamping blocks 33 are driven to move away from each other, so that the second clamping block 33 and the flange plate are separated by a certain distance. , start the second motor 11, drive the two third sliders 13 to move away from each other and the two fourth sliders 14 to move towards each other, so that the bottom end of the flange plate is separated from the second clamping block 33 and the clamping device is kept away from the flange Plate, in the process that the bottom end of the flange plate is separated from the second clamping block 33, since the second clamping block 33 has been spaced a certain distance from the flange plate, the second clamping block 33 will not hinder the overall upward movement of the H-shaped steel, and When the turning mechanism drives the H-beam to rotate, the clamping device will not interfere with the turning of the H-beam, so as to realize the turning of the H-beam, which is easy to operate and improves the welding efficiency of the H-beam; it should be noted that because the clamping device It will not interfere with the turning of the H-shaped steel, so that the second motor 11 drives the second screw rod 12 to rotate, and can simultaneously drive the two third sliders 13 and the two fourth sliders 14 to move relative to each other. Compared with using different mechanisms to Separately driving the third slider 13 and the fourth slider 14 to move relative to each other makes the operation of the application more convenient and saves the purchase cost of the equipment at the same time.

Please refer to Fig. 2 and Fig. 3, described overturning mechanism comprises mirror-symmetrical supporting base 18, roller 19, gear 23, ring gear 24 and first clamping block 20, and described supporting base 18 is slidably arranged on lifting base 17, two A fifth slide block 29 is respectively installed on one side of the block supporting seat 18, and a third screw mandrel 30 is inserted in the middle of the fifth slide block 29 and is threadedly connected with it. The output end is fixedly connected, the fourth motor 28 is installed on the second support plate 27, and the second support plate 27 is installed on the lifting seat 17. When the fourth motor 28 drives the third screw rod 30 to rotate, it will drive two fifth sliders 19 to move relative to each other, thereby driving the supporting seat 18 to move relative to each other.

Please refer to Fig. 6 and Fig. 7, Fig. 6 and Fig. 7 are respectively the cross-sectional schematic diagrams of the different positions of the support seat 18, one end of the roller 19 extends to the inside of the support seat 18 and rotates with the support seat 18, the roller 19 The end is provided with a second annular projection 1901, and the second annular projection 1901 is slidably matched with the annular chute provided inside the support seat 18. Through the sliding fit between the second annular projection 1901 and the annular groove, the roller 19 is restricted from moving along the The movement in the axial direction, the second annular protrusion 1901 is installed with a number of protruding rods 1902 at intervals, the protruding rods 1902 are adapted to the annular limit groove 1801 provided inside the support seat 18, and the protruding rods 1902 are connected to the annular limit grooves. 1801, so that the support seat 18 can drive the drum 19 to move up and down. The ring gear 24 is arranged on the outer surface of the drum 19. The ring gear 24 is meshed with the gear 23. The motor 22 is driven to rotate, and the two first clamping blocks 20 are arranged on the inner side of the roller 19 and are arranged oppositely. The end of the roller 19 away from the support seat 18 is provided with a groove 21 for the web of the H-shaped steel to pass through. It can be understood that, after the relative movement of the two support bases 18, since the protruding rod 1902 on the roller 19 matches the annular limit groove 1801 provided on the support base 18, the relative movement of the roller 19 can be driven, so that the first clip The block 20 relatively moves to clamp the web of the H-shaped steel. At this time, the ring gears 24 on the two support seats 18 abut together to form a complete whole, so that when the gear 23 meshes with the ring gear 24, it can drive the H-shaped steel. Section steel flipped.

Referring to Fig. 2, the outer surface of the drum 19 is provided with a first annular protrusion 25, and the first annular protrusion 25 is rotatably fitted with a roller 26, and the roller 26 is rotatably connected to the support base 18 through a bearing, The rotation cooperation between an annular projection 25 and the rolling wheel 26 makes the roller 19 rotate more smoothly when the gear 23 meshes with the ring gear 24 .

Referring to Fig. 5, the clamping device includes a fixed base 31, the fixed base 31 is fixedly connected with the connecting rod 16, and the driving mechanism includes a fourth screw 32 that is rotatably connected to the fixed base 31, and the fourth screw rod The middle part of 32 runs through the second clamping block 33 and is threadedly connected with it, and the upper end of the second clamping block 33 penetrates the fixing seat 31 and is slidably matched with it. It can be understood that when the fourth screw rod 32 is rotated, two second The clamping blocks 33 move away or towards each other.

Please refer to Fig. 1 and Fig. 4, a bracket 2 is installed on the upper surface of the base 1, an actuator is arranged on the bracket 2, and the bracket includes two side plates arranged oppositely and a The top plate, the actuator includes a cylinder 3 installed on the side plate, the output end of the cylinder 3 is fixedly connected with the first slider 4, the upper surface of the first slider 4 is slidingly matched with the top plate, and the first slider 4 is lowered Two first support plates 5 are installed on the surface. The first support plate 5 is rotatably connected with a first threaded mandrel 7, one end of the first threaded mandrel 7 is fixedly connected with the output end of the first motor 6, and the first motor 6 is mounted on the first support plate 5 Above, the middle part of the first screw rod 7 passes through the second slider 8 and is screwed with it. The second slider 8 is equipped with an electric telescopic rod 9, and the central axis of the first screw rod 7 is in line with the H-shaped steel The length direction of the web is parallel. The telescopic end of the electric telescopic rod 9 is fixedly connected with a welding torch 10 , and the electric telescopic rod 9 is used to drive the welding torch 10 to move up and down. It can be understood that, through the expansion and contraction of the cylinder 3, the first slider 4 is driven to move laterally, thereby driving the welding torch 10 to move laterally, which is convenient for welding the two ends of the web and the flange plate together, and the first screw rod is driven by the first motor 6 7 rotates to drive the electric telescopic rod 9 to move back and forth, thereby driving the welding torch 10 to move back and forth, so as to facilitate the welding of different positions of the web and the flange plates; 7 in the direction of the central axis, the second slider 8 can be set to slide with the slide bar or the second slide 8 can be set to slide with the first slide 4, wherein the two ends of the slide bar are fixedly connected with the first support plate 5 , is not limited here.

The working principle of the present invention: during specific use, by rotating the fourth screw mandrel 32, the two second clamping blocks 33 are driven to move toward each other to clamp the flange plate to be welded, and by rotating the third screw mandrel 30, the mirror image is driven The symmetrical support base 18 and the first clamping block 20 move toward each other, so that the first clamping block 20 clamps the web to be welded, and at the same time, the ring gears 24 on the two support bases 18 abut together to form a complete Ring gear 24; then start the second motor 11, the second motor 11 drives the second screw mandrel 12 to rotate, so that the two third sliders 13 move toward each other, and the two fourth sliders 14 move opposite each other, when the height of the web When the center plane of the flange plate coincides with the center plane of the height direction of the flange plate, the surface of the flange plate is just in contact with the two ends of the web plate. At this time, the welding torch 10 is driven to move laterally, forward and backward, and up and down, and the welding torch 10 will move the surface of the web plate The two ends are welded together with the flange plate; then the fourth screw mandrel 32 is reversely rotated to drive the two second clamping blocks 33 to move away from each other, so that the second clamping block 33 is spaced from the flange plate at a certain distance without restricting until the H-shaped steel moves upwards, and then the second motor 11 drives the second screw 12 to rotate in the opposite direction, so that the two third sliders 13 move opposite to each other, and the two fourth sliders 14 move towards each other. When the flange plate goes up After moving to a certain height position, the fourth motor 28 drives the gear 23 to rotate, and the gear 23 drives the ring gear 24 to rotate, thereby turning the H-shaped steel 180°, and then the second motor 11 drives the second screw rod 12 to rotate, so that the web and the flange plate move downward as a whole, and when the bottom end of the web plate is against the fixed seat 31, the H-shaped steel moves into place, and at this moment, the other surface of the web plate and the flange plate can be welded together by the welding torch 10.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and thus should not be construed as limitations on the invention.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application of the embodiments. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. An H-beam welding apparatus, comprising:

the device comprises a base (1), wherein a second motor (11) is arranged in the base (1), the output end of the second motor (11) is fixedly connected with a second screw rod (12), and two third sliding blocks (13) and two fourth sliding blocks (14) penetrate through the middle of the second screw rod (12) and are in threaded connection with the second screw rod;

the lifting seat (17), two rotating rods (15) which are symmetrically arranged are rotationally connected to the lifting seat (17), one end, far away from the lifting seat (17), of each rotating rod (15) is rotationally connected with a fourth sliding block (14), a turnover mechanism is arranged on the lifting seat (17), and the lifting seat (17) turns a web plate of the H-shaped steel by 180 degrees through the turnover mechanism and drives the web plate of the H-shaped steel to move up and down;

the clamping devices are respectively arranged at two sides of the lifting seat (17), and each clamping device comprises two second clamping blocks (33) and a driving mechanism, and the driving mechanism is used for driving the two second clamping blocks (33) to move back to back or move in opposite directions, so that the second clamping blocks (33) fix the flange plates of the H-shaped steel; the clamping devices on the two sides are respectively fixedly connected with the third sliding block (13) through connecting rods (16).

2. An H-section steel welding apparatus as claimed in claim 1 wherein: the turnover mechanism comprises a supporting seat (18), a roller (19), a gear (23), a gear ring (24) and a first clamping block (20), wherein the supporting seat (18) is arranged on a lifting seat (17) in a sliding mode, a fifth sliding block (29) is respectively arranged on one side of each supporting seat (18), a third screw rod (30) is inserted in the middle of each fifth sliding block (29) and is in threaded connection with the fifth sliding block, one end of each third screw rod (30) is fixedly connected with the output end of a fourth motor (28), one end of each roller (19) is in running fit with the supporting seat (18), a second annular protruding block (1901) is arranged at the tail end of each roller (19), a plurality of protruding rods (1902) are arranged on each second annular protruding block (1901) at intervals, annular limiting grooves (1801) formed in the protruding rods (1902) and the supporting seat (18) are matched, each tooth ring (24) is arranged on the outer surface of the roller (19), each tooth ring (24) is in meshed connection with the gear ring (23), one end of each third screw rod (30) is fixedly connected with the output end of each fourth motor (28), one end of each third screw rod (19) is arranged on the supporting seat (18), each third protruding rod (22) is rotatably arranged on the corresponding supporting seat (19), one end of each protruding rod (1901) is arranged on the corresponding roller (19), and is far away from the corresponding roller (19), and the corresponding roller (20) is arranged.

3. An H-section steel welding apparatus as claimed in claim 2 wherein: the outer surface of the roller (19) is provided with a first annular protruding block (25), the first annular protruding block (25) is in rotating fit with a roller (26), and the roller (26) is rotatably connected to the supporting seat (18) through a bearing.

4. An H-section steel welding apparatus as claimed in claim 1 wherein: the clamping device comprises a fixing seat (31), the fixing seat (31) is fixedly connected with the connecting rod (16), the driving mechanism comprises a fourth screw rod (32) which is rotationally connected to the fixing seat (31), the middle part of the fourth screw rod (32) penetrates through the second clamping block (33) and is in threaded connection with the second clamping block, and the upper end of the second clamping block (33) penetrates through the fixing seat (31) and is in sliding fit with the fixing seat.

5. An H-section steel welding apparatus as claimed in claim 1 wherein: install support (2) on base (1), be provided with actuating mechanism on support (2), actuating mechanism includes electric telescopic handle (9) at least, electric telescopic handle (9)'s telescopic end fixedly connected with welder (10), electric telescopic handle (9) are used for driving welder (10) up-and-down motion.

6. An H-beam welding apparatus as defined in claim 5, wherein: the actuating mechanism comprises two first support plates (5), a first screw rod (7) is rotationally connected to the first support plates (5), one end of the first screw rod (7) is fixedly connected with the output end of a first motor (6), the first motor (6) is installed on the first support plates (5), the middle part of the first screw rod (7) penetrates through a second sliding block (8) and is in threaded connection with the second sliding block, an electric telescopic rod (9) is installed on the second sliding block (8), and the central axis of the first screw rod (7) is parallel to the length direction of a web plate of the H-shaped steel.

7. The H-beam welding apparatus as set forth in claim 6, wherein: the support comprises two side plates and a top plate, wherein the two side plates are oppositely arranged, the top plate is arranged between the two side plates, an air cylinder (3) is arranged on each side plate, a first sliding block (4) is fixedly connected to the output end of each air cylinder (3), the upper surface of each first sliding block (4) is in sliding fit with the top plate, and the lower surface of each first sliding block (4) is provided with a first supporting plate (5).

8. An H-section steel welding apparatus as claimed in claim 1 wherein: the directions of the internal threads on the two third sliding blocks (13) are opposite, and the directions of the internal threads on the two fourth sliding blocks (14) are opposite.

9. An H-beam welding apparatus as defined in claim 4, wherein: and a rubber pad is arranged on the second clamping block (33).

10. An H-section steel welding apparatus as claimed in claim 2 wherein: a rubber pad is arranged on the first clamping block (20).