Welding device for stiffening gusset plate on steel truss girder

Abstract

The invention belongs to the technical field of steel truss girder welding, and discloses a welding device for a stiffening gusset plate on a steel truss girder, which comprises a base supporting mechanism, a first-stage lifting mechanism is arranged at the upper end of the base supporting mechanism, and a second-stage lifting mechanism is arranged at the upper end of the first-stage lifting mechanism. Wherein a linkage mechanism is arranged between the first-stage lifting mechanism and the second-stage lifting mechanism, mechanical arms are symmetrically arranged on the two sides of the upper end of the second-stage lifting mechanism, and welding guns are arranged at the upper ends of the mechanical arms. Before welding, the minimum stage of the stress at the connecting position of the upper stiffening gusset plate and the upper chord is calculated and determined by utilizing the alternate change of the stress of each rod piece in the pushing process, and the stress at the connecting position of the upper stiffening gusset plate and the upper chord is eliminated through a pushing measure at the stage, so that the stress-free state of the welding position is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel truss welding, and in particular relates to a welding device for a stiffening node plate on a steel truss. Background Art

[0002] In a truss, the node is the place where the members meet. Node plates are required at the nodes to connect the members and transfer and balance the internal forces of the members. The node plates are extremely important components of steel trusses. In the upper stiffening area of ​​the continuous steel truss with upper stiffening, its upper chord is not only connected to the main truss web, but also to the stiffening chord. Therefore, the upper chord here is not only connected to the main truss web by a node plate at the bottom, but also connected to the stiffening chord by a node plate at the top.

[0003] Because the upper chord is affected by its own weight, it will produce downward deflection, which will cause internal stress in the weld between the upper chord and the upper stiffening node plate, reducing the quality of the weld and increasing the probability of quality hazards inside the weld, thereby affecting the assembly quality of the steel truss. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a welding device for a stiffened node plate on a steel truss. Before welding, the stress of each member is changed alternately during the jacking process to calculate and determine the stage of minimum stress at the connection position between the upper stiffened node plate and the upper chord. At this stage, the stress at the connection position between the upper stiffened node plate and the upper chord is eliminated through jacking measures to achieve a stress-free state at the welding position.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The welding device of the stiffened node plate on the steel truss comprises a base support mechanism, a first-level lifting mechanism is arranged at the upper end of the base support mechanism, a second-level lifting mechanism is arranged at the upper end of the first-level lifting mechanism, a linkage mechanism is arranged between the first-level lifting mechanism and the second-level lifting mechanism, mechanical arms are symmetrically arranged on both sides of the upper end of the second-level lifting mechanism, and a welding gun is arranged at the upper end of the mechanical arms.

[0007] Furthermore, the base supporting mechanism includes a first square plate and a second square plate vertically arranged up and down, a space is left between the first square plate and the second square plate, four fixing pins are fixedly connected between the first square plate and the second square plate, the four fixing pins are respectively located at the four corners of the first square plate and the second square plate, a connecting sleeve is rotatably connected to the fixing pin, a first support rod is fixedly connected to the side of the connecting sleeve, the other end of the first support rod is rotatably connected to the second support rod, a cylinder is provided at the lower end of the connection between the first support rod and the second support rod, one end of the cylinder is rotatably connected to the lower end of the first support rod, and the other end of the cylinder is rotatably connected to the lower end of the second support rod.

[0008] Furthermore, a first gear is rotatably connected to the middle of the lower surface of the first square plate, four second gears are meshedly connected to the circumferential side of the first gear, the second gear is rotatably connected to the lower surface of the first square plate, and a third gear is fixedly connected to the circumferential side of the upper end of the connecting sleeve, and the third gear is meshedly connected to the corresponding second gear.

[0009] Furthermore, a first retaining ring and a second retaining ring are fixedly connected to the lower surface of the first gear, and the first retaining ring and the second retaining ring are respectively arranged coaxially with the first gear, the inner diameter of the first retaining ring is larger than the outer diameter of the second retaining ring, and an annular slide groove is formed between the inner side surface of the first retaining ring and the outer side surface of the second retaining ring, and four evenly distributed inclined blocks are fixedly connected in the annular slide groove, and a sliding rod is vertically arranged at the lower end of the inclined surface of the inclined block, and the sliding rod penetrates the second square plate downward and is slidably connected to the second square plate, and the top end of the sliding rod slides in the annular slide groove, and a blocking piece is fixedly connected to the sliding rod, and a compression spring is sleeved on the circumference of the sliding rod between the lower end of the blocking piece and the upper end of the second square plate, and the lower end of the sliding rod is rotatably connected to a universal wheel, and a receiving groove is provided on the lower surface of the second square plate and at the universal wheel.

[0010] Furthermore, a first motor is fixedly connected in the middle of the lower surface of the first square plate and on the inner side of the first gear, a cross connecting rod is fixedly connected to the output end of the first motor, and the circumferential side of the cross connecting rod is fixedly connected to the inner side surface of the second retaining ring.

[0011] Furthermore, the first-stage lifting mechanism includes a square hollow tube arranged vertically, the lower end of the square hollow tube is fixedly connected to the upper surface of the first square plate, a first screw is vertically arranged on the inner side of the square hollow tube, the lower end of the first screw is rotatably connected to the first square plate, the inner side of the square hollow tube is slidably connected to a square tube, the square tube is threadedly connected to the first screw, the lower end of the first screw is fixedly connected to a first bevel gear, the outer side surface of the lower end of the square hollow tube is fixedly connected to a second motor, the output end of the second motor passes through the side wall of the square hollow tube and is fixedly connected to a second bevel gear, and the second bevel gear is meshingly connected to the first bevel gear.

[0012] Furthermore, a first limiting sliding groove is opened on the side surface of the square hollow tube along its length direction, and a first limiting sliding block is fixedly connected to the lower end side surface of the square tube, and the first limiting sliding block is slidably connected to the first limiting sliding groove.

[0013] Furthermore, the secondary lifting mechanism includes a fixed circular plate, which is fixedly connected to the top of the square tube, and a lifting circular plate is arranged on the upper end of the fixed circular plate, and a second screw is fixedly connected to the lower end of the lifting circular plate in a vertically symmetrical manner, and the second screw extends downward and penetrates the fixed circular plate, and a nut sleeve is threadedly connected to the lower end of the second screw, and a fourth gear is fixedly connected to the upper end of the nut sleeve, and the upper end of the fourth gear is rotatably connected to the lower surface of the fixed circular plate, and a fifth gear is meshed between the two fourth gears, and the fifth gear is rotatably connected to the square tube, and the lower end of the lifting circular plate is fixedly connected to a limiting rod along its circumference, and the limiting rod extends downward and penetrates the fixed circular plate.

[0014] Further, the linkage mechanism includes a connecting sleeve rod arranged vertically, the lower end of the connecting sleeve rod is rotatably connected to the first square plate, the connecting sleeve rod is slidably connected to a connecting rod on the inner side, the upper end of the connecting rod is rotatably connected to the fixed circular plate, the side surface of the connecting sleeve rod is provided with a second limiting sliding groove along its length direction, the lower end side surface of the connecting rod is fixedly connected to a second limiting sliding block, the second limiting sliding block is slidably connected in the second limiting sliding groove, the lower end of the connecting sleeve rod is fixedly connected to a third bevel gear, the third bevel gear is meshed with a fourth bevel gear, the side surface of the fourth bevel gear is fixedly connected to a connecting shaft, the connecting shaft passes through the side wall of the square hollow tube, the other end of the connecting shaft is fixedly connected to a fifth bevel gear, the fifth bevel gear is meshed with the first bevel gear, the upper end of the connecting rod is fixedly connected to a sixth gear, and the sixth gear is meshed with the fifth gear.

[0015] Furthermore, outwardly protruding ear plates are symmetrically arranged on both sides of the lifting circular plate, and the two pairs of mechanical arms are symmetrically arranged on the corresponding ear plates.

[0016] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0017] Fixed connection refers to a connection in which parts or components are fixed without any relative movement. There are two types of connection: detachable and non-detachable.

[0018] (1) A removable connection is a connection that uses screws, splines, wedge pins, etc. to hold parts together. This type of connection can be disassembled for maintenance without damaging the parts. However, the specifications of the connectors used must be correct (such as the length of the bolts, keys, and wedge pins) and they must be properly tightened.

[0019] (2) Non-detachable connections mainly refer to welding, riveting and tenoning. Since they need to be disassembled by forging, sawing or oxygen cutting for maintenance or replacement, spare parts generally cannot be reused. At the same time, when making connections, attention should be paid to process quality, technical inspection and remedial measures (such as calibration, polishing, etc.).

[0020] A threaded connection refers to a detachable connection in which the connected parts are connected together using threaded parts (or the threaded parts of the connected parts).

[0021] A sliding connection is when two objects are in contact but not fixed and can slide relative to each other.

[0022] A rotational connection is a connection between parts that allows the parts to rotate relative to each other.

[0023] Beneficial effects of the present invention:

[0024] Before welding, the stress of each member is changed alternately during the jacking process to calculate and determine the minimum stress stage at the connection between the upper stiffening node plate and the upper chord. At this stage, the stress at the connection between the upper stiffening node plate and the upper chord is eliminated through jacking measures to achieve a stress-free state at the welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the overall structure of the base support mechanism of an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of the first gear structure of an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of a connection structure between a first support rod and a second support rod according to an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of the annular chute structure of an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the structure of the inclined block of an embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of the universal wheel structure of an embodiment of the present invention;

[0033] Figure 8 2 is a schematic structural diagram of a first-level lifting mechanism according to an embodiment of the present invention;

[0034] Fig. 9 This is a schematic diagram of the internal structure of a square hollow tube according to an embodiment of the present invention;

[0035] Fig.10It is a schematic diagram of the structure of the secondary lifting mechanism of an embodiment of the present invention;

[0036] Fig.11 It is a schematic diagram of the linkage mechanism structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] like Figure 1-11 As shown, the welding device for the stiffened node plate on the steel truss comprises a base support mechanism 1, a first-level lifting mechanism 2 is arranged at the upper end of the base support mechanism 1, a second-level lifting mechanism 3 is arranged at the upper end of the first-level lifting mechanism 2, a linkage mechanism 4 is arranged between the first-level lifting mechanism 2 and the second-level lifting mechanism 3, mechanical arms 5 are symmetrically arranged on both sides of the upper end of the second-level lifting mechanism 3, and a welding gun 6 is arranged at the upper end of the mechanical arms 5.

[0040] The outward expansion of the base support mechanism 1 increases the stability of the entire device and can adjust the inclination angle of the device, thereby adjusting the lifting direction. While the first-level lifting mechanism 2 rises, the second-level lifting mechanism 3 is driven to rise at the same time through the linkage mechanism 4, thereby increasing the formation of the lift. The top end of the second-level lifting mechanism 3 contacts the upper chord and then lifts upward.

[0041] Before welding, the stress of each member is changed alternately during the jacking process to calculate and determine the minimum stress stage at the connection between the upper stiffening node plate and the upper chord. At this stage, the stress at the connection between the upper stiffening node plate and the upper chord is eliminated through jacking measures to achieve a stress-free state at the welding position.

[0042] In one embodiment of the present invention, the base support mechanism 1 includes a first square plate 101 and a second square plate 102 which are vertically arranged up and down, with a space left between the first square plate 101 and the second square plate 102, four fixing pins 103 are fixedly connected between the first square plate 101 and the second square plate 102, and the four fixing pins 103 are respectively located at the four corners of the first square plate 101 and the second square plate 102, a connecting sleeve 104 is rotatably connected to the fixing pin 103, a first support rod 105 is fixedly connected to the side of the connecting sleeve 104, the other end of the first support rod 105 is rotatably connected to the second support rod 106, a cylinder 120 is provided at the lower end of the connection between the first support rod 105 and the second support rod 106, one end of the cylinder 120 is rotatably connected to the lower end of the first support rod 105, and the other end of the cylinder 120 is rotatably connected to the lower end of the second support rod 106. When the four first support rods 105 and the second support rod 106 rotate and expand outward, the driving cylinder 120 contracts, driving the second support rod 106 to rotate around the connection point until the end of the second support rod 106 contacts the supporting surface, thereby increasing the stability of the entire device. At the same time, the level of the device can also be adjusted by adjusting the cylinder 120.

[0043] In one embodiment of the present invention, a first gear 107 is rotatably connected to the middle of the lower surface of the first square plate 101, and four second gears 108 are meshedly connected to the circumference of the first gear 107. The second gears 108 are rotatably connected to the lower surface of the first square plate 101, and a third gear 109 is fixedly connected to the circumference of the upper end of the connecting sleeve 104, and the third gear 109 is meshedly connected to the corresponding second gear 108. The rotation of the first gear 107 drives the second gear 108 to rotate, the second gear 108 drives the third gear 109 to rotate, and the third gear 109 drives the connecting sleeve 104 to rotate, thereby realizing the simultaneous expansion and contraction of the four first support rods 105.

[0044] In one embodiment of the present invention, the lower surface of the first gear 107 is fixedly connected to a first retaining ring 110 and a second retaining ring 111, the first retaining ring 110 and the second retaining ring 111 are respectively arranged coaxially with the first gear 107, the inner diameter of the first retaining ring 110 is greater than the outer diameter of the second retaining ring 111, and an annular groove 112 is formed between the inner side surface of the first retaining ring 110 and the outer side surface of the second retaining ring 111, and four evenly distributed inclined blocks 113 are fixedly connected in the annular groove 112, and the lower end of the inclined surface of the inclined block 113 is along the A sliding rod 114 is vertically arranged, and the sliding rod 114 passes through the second square plate 102 downward and is slidably connected to the second square plate 102. The top end of the sliding rod 114 slides in the annular sliding groove 112. A blocking piece 115 is fixedly connected to the sliding rod 114. A compression spring 116 is sleeved on the peripheral side of the sliding rod 114 between the lower end of the blocking piece 115 and the upper end of the second square plate 102. The lower end of the sliding rod 114 is rotatably connected to a universal wheel 121, and a receiving groove 117 is provided on the lower surface of the second square plate 102 and at the universal wheel 121. When the first gear 107 rotates to change the four first support rods 105 from an expanded state to a contracted state, the four inclined blocks 113 rotate along with the first gear 107, and the inclined surface of the inclined block 113 pushes the slide bar 114 downward, and the compression spring 116 contracts under the force. At this time, the universal wheel 121 moves out of the accommodating groove 117, which facilitates the movement of the entire device. When the first gear 107 rotates to change the four first support rods 105 from a contracted state to an expanded state, under the elastic force of the compression spring 116, the slide bar 114 gradually moves upward until the universal wheel 121 moves into the accommodating groove 117.

[0045] In one embodiment of the present invention, a first motor 118 is fixedly connected to the middle of the lower surface of the first square plate 101 and located inside the first gear 107, a cross link 119 is fixedly connected to the output end of the first motor 118, and the circumferential side of the cross link 119 is fixedly connected to the inner side of the second retaining ring 111. The first motor 118 drives the cross link 119 to rotate, the cross link 119 drives the second retaining ring 111 to rotate, and the second retaining ring 111 drives the first gear 107 to rotate.

[0046] In one embodiment of the present invention, the first-stage lifting mechanism 2 includes a square hollow tube 201 arranged vertically, the lower end of the square hollow tube 201 is fixedly connected to the upper surface of the first square plate 101, a first screw 202 is vertically arranged on the inner side of the square hollow tube 201, the lower end of the first screw 202 is rotatably connected to the first square plate 101, a square tube 203 is slidably connected to the inner side of the square hollow tube 201, the square tube 203 is threadedly connected to the first screw 202, the lower end of the first screw 202 is fixedly connected to the first bevel gear 204, the outer side surface of the lower end of the square hollow tube 201 is fixedly connected to the second motor 205, the output end of the second motor 205 passes through the side wall of the square hollow tube 201 and is fixedly connected to the second bevel gear 206, and the second bevel gear 206 is meshingly connected to the first bevel gear 204. The second motor 205 drives the second bevel gear 206 to rotate, the second bevel gear 206 drives the first bevel gear 204 to rotate, the first bevel gear 204 drives the first screw 202 to rotate, and the first screw 202 drives the square tube 203 to move upward, thereby achieving a lifting and lowering effect.

[0047] In one embodiment of the present invention, a first limiting slide groove 207 is provided on the side of the square hollow tube 201 along its length direction, a first limiting slider 208 is fixedly connected to the side of the lower end of the square tube 203, and the first limiting slider 208 is slidably connected to the first limiting slide groove 207. The ascending distance of the square tube 203 is limited to prevent the square tube 203 from being separated.

[0048] In one embodiment of the present invention, the secondary lifting mechanism 3 includes a fixed circular plate 301, which is fixedly connected to the top of the square tube 203. A lifting circular plate 302 is arranged on the upper end of the fixed circular plate 301. A second screw 303 is fixedly connected to the lower end of the lifting circular plate 302 in a vertically symmetrical manner. The second screw 303 extends downward and penetrates the fixed circular plate 301. A nut sleeve 304 is threadedly connected to the lower end of the second screw 303. A fourth gear 305 is fixedly connected to the upper end of the nut sleeve 304. The upper end of the fourth gear 305 is rotatably connected to the lower surface of the fixed circular plate 301. A fifth gear 306 is meshed between the two fourth gears 305. The fifth gear 306 is rotatably connected to the square tube 203. The lower end of the lifting circular plate 302 is fixedly connected to a limiting rod 307 along its circumference. The limiting rod 307 extends downward and penetrates the fixed circular plate 301. The fourth gear 305 is driven to rotate by driving the fifth gear 306, the fourth gear 305 drives the nut sleeve 304 to rotate, the nut sleeve 304 drives the second screw rod 303 to rise and fall, the second screw rod 303 drives the lifting circular plate 302 to rise and fall, the lifting circular plate 302 moves up to hold up the upper chord rod. The setting of the limit rod 307 improves the stability of the lifting circular plate 302.

[0049] In one embodiment of the present invention, the linkage mechanism 4 includes a connecting rod 401 arranged vertically, the lower end of the connecting rod 401 is rotatably connected to the first square plate 101, the inner side of the connecting rod 401 is slidably connected to a connecting rod 402, the upper end of the connecting rod 402 is rotatably connected to the fixed circular plate 301, the side of the connecting rod 401 is provided with a second limiting slide groove 403 along its length direction, the lower end side of the connecting rod 402 is fixedly connected to a second limiting slider 404, and the second limiting slider 404 is slidably connected to the second limiting slide groove 403. Inside, the lower end of the connecting sleeve rod 401 is fixedly connected to the third bevel gear 405, the fourth bevel gear 406 is meshed on the third bevel gear 405, the side of the fourth bevel gear 406 is fixedly connected to the connecting shaft 407, the connecting shaft 407 passes through the side wall of the square hollow tube 201, the other end of the connecting shaft 407 is fixedly connected to the fifth bevel gear 408, the fifth bevel gear 408 is meshed with the first bevel gear 204, the upper end of the connecting rod 402 is fixedly connected to the sixth gear 409, the sixth gear 409 is meshed with the fifth gear 306. The first bevel gear 204 rotates to drive the fifth bevel gear 408 to rotate, the fifth bevel gear 408 drives the connecting shaft 407 to rotate, the connecting shaft 407 drives the fourth bevel gear 406 to rotate, the fourth bevel gear 406 drives the connecting sleeve rod 401 to rotate, the connecting sleeve rod 401 drives the connecting rod 402 to rotate, the connecting rod 402 drives the sixth gear 409 to rotate, the sixth gear 409 drives the fifth gear 306 to rotate, the fifth gear 306 rotates to drive the fourth gear 305 to rotate, the fourth gear 305 drives the nut sleeve 304 to rotate, the nut sleeve 304 drives the second screw rod 303 to rise and fall, the second screw rod 303 drives the lifting circular plate 302 to rise and fall, the lifting circular plate 302 moves up to hold up the upper chord rod. While the square tube 203 rises, the lifting circular plate 302 also rises relatively to achieve linkage.

[0050] In one embodiment of the present invention, the two sides of the lifting circular plate 302 are symmetrically provided with outwardly protruding ear plates 308, and two pairs of mechanical arms 5 are symmetrically arranged on the corresponding ear plates 308. By controlling the mechanical arms 5, the welding gun 6 welds the seam between the upper chord and the upper stiffening node plate.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A welding device for a stiffened node plate on a steel truss, comprising a base support mechanism (1), characterized in that: A primary lifting mechanism (2) is arranged at the upper end of the base support mechanism (1), a secondary lifting mechanism (3) is arranged at the upper end of the primary lifting mechanism (2), a linkage mechanism (4) is arranged between the primary lifting mechanism (2) and the secondary lifting mechanism (3), mechanical arms (5) are symmetrically arranged on both sides of the upper end of the secondary lifting mechanism (3), and a welding gun (6) is arranged at the upper end of the mechanical arms (5).

2. The welding device for the stiffening node plate on the steel truss according to claim 1 is characterized in that: The base support mechanism (1) comprises a first square plate (101) and a second square plate (102) which are vertically arranged in an upper and lower direction, a space is left between the first square plate (101) and the second square plate (102), four fixing pins (103) are fixedly connected between the first square plate (101) and the second square plate (102), the four fixing pins (103) are respectively located at four corners of the first square plate (101) and the second square plate (102), and a connecting sleeve is rotatably connected to the fixing pin (103). (104), a first support rod (105) is fixedly connected to the side of the connecting sleeve (104), the other end of the first support rod (105) is rotatably connected to the second support rod (106), a cylinder (120) is provided at the lower end of the connection between the first support rod (105) and the second support rod (106), one end of the cylinder (120) is rotatably connected to the lower end of the first support rod (105), and the other end of the cylinder (120) is rotatably connected to the lower end of the second support rod (106).

3. The welding device for the stiffening node plate on the steel truss according to claim 2 is characterized in that: A first gear (107) is rotatably connected in the middle of the lower surface of the first square plate (101); four second gears (108) are meshingly connected to the circumference of the first gear (107); the second gears (108) are rotatably connected to the lower surface of the first square plate (101); a third gear (109) is fixedly connected to the circumference of the upper end of the connecting sleeve (104); and the third gear (109) is meshingly connected to the corresponding second gear (108).

4. The welding device for the stiffening node plate on the steel truss according to claim 3 is characterized in that: A first retaining ring (110) and a second retaining ring (111) are fixedly connected to the lower surface of the first gear (107); the first retaining ring (110) and the second retaining ring (111) are respectively arranged coaxially with the first gear (107); the inner diameter of the first retaining ring (110) is larger than the outer diameter of the second retaining ring (111); an annular slide groove (112) is formed between the inner side surface of the first retaining ring (110) and the outer side surface of the second retaining ring (111); four evenly distributed inclined blocks (113) are fixedly connected in the annular slide groove (112); a slide rod (113) is vertically arranged at the lower end of the inclined surface of the inclined block (113) The sliding rod (114) passes through the second square plate (102) downwards and is slidably connected to the second square plate (102). The top end of the sliding rod (114) slides in the annular sliding groove (112). A baffle (115) is fixedly connected to the sliding rod (114). A compression spring (116) is sleeved on the circumference of the sliding rod (114) between the lower end of the baffle (115) and the upper end of the second square plate (102). The lower end of the sliding rod (114) is rotatably connected to a universal wheel (121). A receiving groove (117) is provided on the lower surface of the second square plate (102) and located at the universal wheel (121).

5. The welding device for the stiffening node plate on the steel truss according to claim 4 is characterized in that: A first motor (118) is fixedly connected in the middle of the lower surface of the first square plate (101) and located on the inner side of the first gear (107); a cross connecting rod (119) is fixedly connected to the output end of the first motor (118); and the circumferential side of the cross connecting rod (119) is fixedly connected to the inner side surface of the second retaining ring (111).

6. The welding device for the stiffening node plate on the steel truss according to claim 2, characterized in that: The first-stage lifting mechanism (2) comprises a square hollow tube (201) arranged vertically, the lower end of the square hollow tube (201) is fixedly connected to the upper surface of the first square plate (101), a first screw rod (202) is arranged vertically on the inner side of the square hollow tube (201), the lower end of the first screw rod (202) is rotatably connected to the first square plate (101), a square tube (203) is slidably connected to the inner side of the square hollow tube (201), and the square The tube (203) is threadedly connected to the first screw rod (202); the lower end of the first screw rod (202) is fixedly connected to the first bevel gear (204); the outer side surface of the lower end of the square hollow tube (201) is fixedly connected to the second motor (205); the output end of the second motor (205) passes through the side wall of the square hollow tube (201) and is fixedly connected to the second bevel gear (206); the second bevel gear (206) is meshedly connected to the first bevel gear (204).

7. The welding device for the stiffening node plate on the steel truss according to claim 6, characterized in that: The side surface of the square hollow tube (201) is provided with a first limiting sliding groove (207) along its length direction, and the lower end side surface of the square tube (203) is fixedly connected with a first limiting sliding block (208), and the first limiting sliding block (208) is slidably connected to the first limiting sliding groove (207).

8. The welding device for the stiffening node plate on the steel truss according to claim 6, characterized in that: The secondary lifting mechanism (3) comprises a fixed circular plate (301), wherein the fixed circular plate (301) is fixedly connected to the top end of the square tube (203), a lifting circular plate (302) is arranged at the upper end of the fixed circular plate (301), a second screw rod (303) is fixedly connected to the lower end of the lifting circular plate (302) in a vertically symmetrical manner, the second screw rod (303) extends downward and penetrates the fixed circular plate (301), and a nut sleeve (304) is threadedly connected to the lower end of the second screw rod (303). The upper end of the nut sleeve (304) is fixedly connected to a fourth gear (305), the upper end of the fourth gear (305) is rotatably connected to the lower surface of the fixed circular plate (301), a fifth gear (306) is meshed between the two fourth gears (305), the fifth gear (306) is rotatably connected to the square tube (203), and the lower end of the lifting circular plate (302) is fixedly connected to a limiting rod (307) along its circumference, and the limiting rod (307) extends downward and penetrates the fixed circular plate (301).

9. The welding device for the stiffening node plate on the steel truss according to claim 8, characterized in that: The linkage mechanism (4) comprises a connecting rod (401) arranged vertically, the lower end of the connecting rod (401) is rotatably connected to the first square plate (101), a connecting rod (402) is slidably connected to the inner side of the connecting rod (401), the upper end of the connecting rod (402) is rotatably connected to the fixed circular plate (301), a second limiting sliding groove (403) is provided on the side of the connecting rod (401) along its length direction, a second limiting sliding block (404) is fixedly connected to the side of the lower end of the connecting rod (402), the second limiting sliding block (404) is slidably connected in the second limiting sliding groove (403), and the connecting rod ( The lower end of the connecting rod (401) is fixedly connected to a third bevel gear (405), the third bevel gear (405) is meshed with a fourth bevel gear (406), the side of the fourth bevel gear (406) is fixedly connected to a connecting shaft (407), the connecting shaft (407) passes through the side wall of the square hollow tube (201), the other end of the connecting shaft (407) is fixedly connected to a fifth bevel gear (408), the fifth bevel gear (408) is meshed with the first bevel gear (204), the upper end of the connecting rod (402) is fixedly connected to a sixth gear (409), the sixth gear (409) is meshed with the fifth gear (306).

10. The welding device for the stiffening node plate on the steel truss according to claim 8, characterized in that: Outwardly protruding ear plates (308) are symmetrically arranged on both sides of the lifting circular plate (302), and the two pairs of mechanical arms (5) are symmetrically arranged on the corresponding ear plates (308).

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