Production technology of tenon-type standard main chord

Abstract

The invention discloses a production process of a tenon-type standard section main chord, which includes the following steps: incoming material inspection: inspecting whether the structural dimensions of the inner side attachment, the outer side attachment and the angle steel are qualified and whether the appearance has defects; welding the inner side attachment of the angle steel: welding the inner side attachment to the designated position on the inner side of the angle steel; square angle steel: aligning two angle steels with welded inner side attachments in a direction and welding them together to form the main chord body; welding the outer side attachment of the main chord body: welding the outer side attachment to the designated position on the outer side of the main chord body to form a semi-finished main chord; correction of the semi-finished main chord: correcting the semi-finished main chord under high temperature conditions; inspection of the semi-finished main chord: inspecting the straightness of the semi-finished main chord and the appearance of the weld; opening the side wall of the semi-finished main chord: opening a connection hole at the designated position on the side wall of the semi-finished main chord. Each step of the production process is reasonably arranged, which improves production efficiency and qualified rate.

Description

Technical Field

[0001] The invention relates to the technical field of engineering equipment, and in particular to a production process of a tenon-type standard-section main chord. Background Art

[0002] With the development of economy, the intensity of infrastructure construction has reached an unprecedented level, and the demand for various engineering equipment has also reached an unprecedented level. For example, the market of tower cranes has been in short supply. The tenon-type standard section main chord is the most important component of large tower cranes. The main chord needs to bear a large load and has high structural strength requirements. As a large structural part, the main chord is composed of various parts and is generally made by riveting or welding. However, the production process or process of the main chord at this stage is not standardized. The main chord produced often has unqualified structural dimensions and too low structural strength, resulting in low qualified rate of the finished main chord, high manufacturing cost, and waste of resources. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a production process for a tenon-type standard section main chord, which can improve the qualified rate of the main chord.

[0004] According to the tenon-type standard section main chord production process of the embodiment of the present invention, the tenon-type standard section main chord production process includes the following steps: incoming material inspection: inspect whether the structural dimensions of the inner accessories, outer accessories and angle steel are qualified and whether the appearance has defects; welding of the inner accessories of the angle steel: weld the inner accessories to the specified position on the inner side of the angle steel; squaring the angle steel: squaring two angle steels with welded inner accessories into a direction and welding them together to form the main chord body; welding of the outer accessories of the main chord body: weld the outer accessories to the specified position on the outer side of the main chord body to form a semi-finished main chord; semi-finished main chord correction: use high temperature conditions to correct the semi-finished main chord; semi-finished main chord inspection: inspect the straightness of the semi-finished main chord and the appearance of the weld; semi-finished main chord side wall opening: open a connecting hole at the specified position on the side wall of the semi-finished main chord to finally obtain a finished main chord.

[0005] The tenon-type standard section main chord production process according to the embodiment of the present invention has at least the following beneficial effects: in the incoming material inspection step, unqualified raw materials can be removed in advance to prepare for the subsequent production of the main chord, thereby avoiding the failure of the main chord due to poor incoming materials; in the welding step of the accessories on the inner side of the angle steel, the accessories or components inside the main chord are first installed and manufactured, and there is no need to rivet other accessories or components on the inner side of the main chord later, thereby improving the production efficiency of the main chord; in the angle steel square splicing step, two angle steels are spliced ​​into square steel, which can effectively improve the structural strength and load of the main chord; the main body of the main chord In the welding step of the outer attachment, the outer attachment of the main chord is welded to the main body of the main chord, so that the connection installation and other auxiliary functions of the main body of the main chord are perfect; in the correction step of the semi-finished product of the main chord, the high temperature condition is conducive to the straightening of the semi-finished product of the main chord, so that the straightness of the main chord is improved, the stress concentration is eliminated, and the structural strength of the main chord is improved; in the inspection step of the semi-finished product of the main chord, unqualified main chords are removed to prevent defective products from flowing out of the market, and the defective main chords can be reworked or recycled; in the opening step of the side wall of the semi-finished product of the main chord, the main chord is opened to improve the structural dimensional accuracy of the main chord. The various steps of the production process are arranged reasonably, the process is smooth, and the steps can be performed in sequence. The main chord has high dimensional accuracy and structural strength, and the production efficiency and qualified rate are improved.

[0006] According to some embodiments of the present invention, the inner side attachment includes a pasting plate, a plug plate and an inner lining plate, and the outer side attachment includes a step and a gusset plate.

[0007] According to some embodiments of the present invention, in the step of squaring the angle steels, the two angle steels with welded inner accessories are first positioned and welded together by spot welding, and in the step of welding the outer accessories of the main chord body, the outer accessories are first positioned and welded to the outside of the main chord body by spot welding, and then the gap between the two angle steels and the gap between the outer accessories and the side wall of the main chord body are completely welded and sealed.

[0008] According to some embodiments of the present invention, the gap between the two angle steels and the gap between the outer attachment and the side wall of the main chord body are sealed by welding using a high-efficiency, low-heat-input TANDEM double-wire welding process.

[0009] According to some embodiments of the present invention, in the step of opening a hole in the side wall of the semi-finished main chord product, a small hole is first opened at a designated position on the side wall of the semi-finished main chord product, and then the small hole is expanded to a connecting hole of designed size.

[0010] According to some embodiments of the present invention, after the step of opening the side wall of the main chord semi-finished product, there is further provided a step of processing the end face of the main chord semi-finished product, in which the end face of the main chord semi-finished product is milled flat to finally obtain the main chord finished product.

[0011] According to some embodiments of the present invention, after the step of opening the side wall of the semi-finished main chord product, there are further steps of structural inspection and appearance inspection of the finished main chord product, to inspect whether the structural dimensions and structural strength of the finished main chord product are qualified, and to inspect whether the appearance of the finished main chord product has any defects.

[0012] According to some embodiments of the present invention, flame heating is used in the main chord semi-finished product correction step.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 It is a flow chart of a production process of a tenon-type standard section main chord according to an embodiment of the present invention;

[0016] Figure 2 This is a structural diagram of a tenon-type standard section main chord;

[0017] Figure 3 for Figure 2 The structural schematic diagram of the angle steel is shown;

[0018] Figure 4 This is a schematic diagram of the production line for the tenon-type standard section main chord;

[0019] Figure 5 It is a structural schematic diagram of the angle steel inner side accessory processing unit and the angle steel sorting and loading unit;

[0020] Figure 6 It is a structural schematic diagram of a square unit;

[0021] Figure 7 It is a structural schematic diagram of the outer side accessory processing unit of the main chord body;

[0022] Figure 8 Schematic diagram of the structure of the fully welded unit. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it is necessary to understand that if there are descriptions involving orientation, such as orientations or positional relationships indicated by up, down, front, back, left, and right, the orientation description may be based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, if there is a description of quantity, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of first or second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 A production process for a tenon-type standard section main chord includes the following steps: incoming material inspection: inspect whether the structural dimensions of the inner side accessories, the outer side accessories and the angle steel are qualified and whether there are any defects in the appearance; welding of the inner side accessories of the angle steel: weld the inner side accessories to the specified position on the inner side of the angle steel; square angle steel: sew two angle steels with welded inner side accessories in a direction and weld them together to form the main chord body; welding of the outer side accessories of the main chord body: weld the outer side accessories to the specified position on the outer side of the main chord body to form a semi-finished main chord; semi-finished main chord correction: calibrate the semi-finished main chord under high temperature conditions; semi-finished main chord inspection: inspect the straightness of the semi-finished main chord and the appearance of the weld; semi-finished main chord side wall opening: open a connecting hole at the specified position on the side wall of the semi-finished main chord to finally obtain a finished main chord.

[0028] In the step of inspecting the incoming materials, unqualified raw materials can be removed in advance to prepare for the subsequent production of the main chord, thus avoiding the failure of the main chord due to poor incoming materials; in the step of welding the accessories on the inner side of the angle steel, the accessories or components inside the main chord are installed and manufactured first, and there is no need to rivet other accessories or components on the inner side of the main chord later, thus improving the production efficiency of the main chord; in the step of square-jointing the angle steel, two pieces of angle steel are joined into square steel, which can effectively improve the structural strength and load of the main chord; in the step of welding the accessories on the outer side of the main chord body, the outer side of the main chord is welded. The side attachments are welded to the main chord body, so that the connection and installation of the main chord body and other auxiliary functions are perfect; in the main chord semi-finished product correction step, the high temperature condition is conducive to straightening the main chord semi-finished product, so that the straightness of the main chord is improved, stress concentration is eliminated, and the structural strength of the main chord is improved; in the main chord semi-finished product inspection step, unqualified main chords are removed to prevent defective products from flowing out of the market, and defective main chords can be reworked or recycled; in the main chord semi-finished product side wall opening step, the main chord is opened to improve the structural dimensional accuracy of the main chord. The various steps of the production process are arranged reasonably, the process is smooth, and the steps can be executed in sequence. The main chord has high dimensional accuracy and structural strength, and the production efficiency and qualified rate are improved.

[0029] In some embodiments of the present invention, the inner attachment includes a pasting plate, a plug plate and an inner lining plate, and the outer attachment includes a step and a node plate. The pasting plate, the plug plate and the inner lining plate are conducive to enhancing the structural strength of the angle steel, and the step and the node plate can provide a foothold and a connection point, thereby increasing the auxiliary function of the main chord.

[0030] In some embodiments of the present invention, the step of square angle steel is performed by spot welding to first position and weld two angle steels with welded inner attachments together, and the step of welding the outer attachments of the main chord body is performed by spot welding to first position and weld the outer attachments to the outer side of the main chord body, and then the gap between the two angle steels and the gap between the outer attachments and the side wall of the main chord body are completely welded. The spot welding method can relatively position each component, and when the position of each component is relatively determined, full welding is performed again. By welding each connection, the dimensional accuracy of the main chord can be improved, and the main chord can be prevented from being unqualified due to structural size problems.

[0031] In some embodiments of the present invention, the gap between the two angle steels and the gap between the outer attachment and the side wall of the main chord body are sealed by the high-efficiency and low-heat input TANDEM double-wire welding process. The TANDEM double-wire welding process can obtain a large penetration, ensure the penetration of the joint, and improve the welding quality. Furthermore, when welding the two angle steels, a 12×12 square steel backing plate is used as a process gasket at the root of the square angle iron. The process gasket can prevent burn-through during welding while ensuring a large penetration, thereby improving the safety of welding and ensuring the welding quality.

[0032] In some embodiments of the present invention, in the step of opening a hole in the side wall of the semi-finished main chord rod, a small hole is firstly opened at a designated position of the side wall of the semi-finished main chord rod, and then the small hole is expanded to a connection hole of a designed size. The method of opening the connection hole first and then expanding the hole can reduce the difficulty of opening the connection hole, reduce the loss of equipment, and improve the accuracy of the connection hole.

[0033] In some embodiments of the present invention, after the step of opening the side wall of the semi-finished main chord rod, there is also a step of processing the end face of the semi-finished main chord rod, milling the end face of the semi-finished main chord rod flat, and finally obtaining the finished main chord rod. The end face of the main chord rod is flat and has a qualified size, which is conducive to the installation and use of the main chord rod, can avoid interference with other equipment or components during transportation and use, and is beautiful.

[0034] In some embodiments of the present invention, after the step of opening the side wall of the semi-finished main chord, there are steps of structural inspection and appearance inspection of the finished main chord to inspect whether the structural dimensions and structural strength of the finished main chord are qualified, and whether the appearance of the finished main chord has defects. The main chord is inspected to ensure the qualification of the main chord, to prevent defective products from entering the market, and to avoid safety accidents.

[0035] In some embodiments of the present invention, the main chord semi-finished product correction step adopts a flame heating method, which is simple to operate and highly efficient.

[0036] See also Figure 2 The tenon-type standard section main chord includes a main chord body, which is in the shape of a square tube. The inner cavity side wall of the main chord body is provided with a pasting plate, a plug plate and an inner lining plate, and the outer wall of the main chord body is provided with a step and a node plate. Figure 3 In detail, the main chord body includes two square steels, the two ends of the plug plate are respectively connected to the two side plates of the square steel, the pasting plate and the lining plate are arranged on the inner wall of the square steel side plate, and the inner lining plate and the square steel side plate are penetrated by through holes.

[0037] It is foreseeable that the production of tenon-type standard section main chords can be carried out using the tenon-type standard section main chord production line, see Figure 4The tenon-type standard section main chord production line includes an angle steel inner side accessory processing unit 100, a square assembly unit 200, a main chord body outer side accessory processing unit 300, a fully welded unit 400, a main chord semi-finished product correction unit 500, a main chord semi-finished product side wall opening unit 600 and a plurality of transport carts. The angle steel inner side accessory processing unit 100, the square assembly unit 200, the main chord body outer side accessory processing unit 300, the fully welded unit 400, the main chord semi-finished product correction unit 500 and the main chord semi-finished product side wall opening unit 600 are arranged in sequence, and the transport cart travels between the units. The work of welding the veneer plate, the insert plate and the inner lining plate to the angle steel is completed on the inner side accessory processing unit 100 of the angle steel, thereby obtaining the pre-processed angle steel; the transport trolley transports the angle steel with the welded veneer plate, the insert plate and the inner lining plate to the square unit 200, and the square unit 200 squares and welds two pre-processed angle steels to obtain a square main chord body; the transport trolley transports the main chord body to the outer side accessory processing unit 300 of the main chord body, and the work of welding the step and the node plate to the main chord body is completed on the outer side accessory processing unit 300 of the main chord body; the transport trolley then transports the main chord body to the outer side accessory processing unit 300 of the main chord body The main body is transported to the full welding unit 400, which completes the welding work between the two angle steels and between the step, the node plate and the main chord to obtain the semi-finished main chord; the transport trolley then transports the semi-finished main chord to the semi-finished main chord correction unit 500, where the semi-finished main chord is straightened; after the semi-finished main chord is straightened, the transport trolley transports the semi-finished main chord to the semi-finished main chord side wall opening unit 600, where the semi-finished main chord is connected with a hole to obtain the finished main chord. The transportation of the angle steel, the main chord body and the semi-finished main chord is completed by the transport trolley, which reduces the workload and intensity of the workers; most of the work of producing the main chord is completed by each unit, which liberates the labor force and improves the quality of the main chord; each unit is arranged in an orderly manner, so that the workshop occupies a small area, the material turnover is convenient, and the management is convenient, which improves the speed of producing the main chord.

[0038] See also Figure 5The angle steel inner side attachment processing unit 100 includes an angle steel fixture 110, a first transport mechanism 120 and a first welding manipulator 130. The first transport mechanism 120 and the first welding manipulator 130 are respectively arranged at the front and rear of the angle steel fixture 110. The first transport mechanism 120 can be used to transport the angle steel to the angle steel fixture 110. The first transport mechanism 120 transports and positions the pasting plate, the inserting plate and the inner lining plate on the angle steel fixture 110. The first welding manipulator 130 can be used to weld the pasting plate, the inserting plate and the inner lining plate to the angle steel. The angle steel is fixed on the angle steel fixture 110, and then the first transport mechanism 120 transports the pasting plate, the inserting plate and the inner lining plate to the corresponding installation positions on the angle steel and positions them. Then, the first welding manipulator 130 welds the pasting plate, the inserting plate and the inner lining plate to the angle steel. The first transport mechanism 120 and the first welding robot 130 are respectively arranged at the front and rear of the angle steel clamp 110 , so as to avoid mutual interference between the first transport mechanism 120 and the first welding robot 130 during operation.

[0039] See also Figure 6 The square unit 200 includes a square fixture 210 and a second welding manipulator. Two pre-processed angle steels can be squared on the square fixture 210 to form a main chord prototype. The second welding manipulator can be used to initially weld the two angle steels together to form the main chord body, which is convenient for subsequent processing of the outer side of the main chord body. An angle steel cache material rack 220 for temporarily storing angle steels and a main chord body cache material rack 230 for temporarily storing the main chord body are respectively provided at the front and rear of the square fixture 210. The angle steel cache material rack 220 and the main chord body cache material rack 230 can prevent the square unit 200 from being shut down for a long time due to logistics, thereby improving the production efficiency of the main chord.

[0040] See also Figure 7 The main chord body outer side attachment processing unit 300 includes a first main chord fixture 310, a second transport mechanism 320 and a third welding manipulator 330. The second transport mechanism 320 can be used to transport and position the step and the node plate on the main chord body on the first main chord fixture 310, and the third welding manipulator 330 can be used to preliminarily weld the step, the node plate and the main chord body together. The second transport mechanism 320 transports the step and the node plate to the corresponding installation position on the main chord body and positions them, and then the third welding manipulator 330 welds the step, the node plate and the main chord body together to obtain a semi-finished main chord.

[0041] See also Figure 8The full welding unit 400 includes a second main chord fixture 410 and a fourth welding manipulator 420. The fourth welding manipulator 420 can be used to complete the welding between two angle steels and between the step, the node plate and the main chord body. The second main chord fixture 410 clamps the main chord body, and the fourth welding manipulator 420 welds metal to the connection between the two angle steels, the connection between the step and the main chord body, and the connection between the node plate and the main chord body, that is, completes the full welding, so that the overall main chord semi-finished product and the structure of the main chord are guaranteed.

[0042] The main chord semi-finished product correction unit 500 includes a first material rack, and the fully welded main chord semi-finished product is placed on the first material rack for annealing, straightening and cooling to improve the structural dimensional accuracy and structural strength of the main chord. The main chord semi-finished product side wall opening unit 600 includes a machining device, which can be used to open holes in the main chord semi-finished product, and the opened holes facilitate the connection of the main chord with other components.

[0043] The transport trolley can pass through the angle steel clamp 110, the square clamp 210, the first main chord clamp 310, the second main chord clamp 410, the first material rack and the machining equipment in sequence. The transport trolley can be used to transport angle steels, main chord bodies and main chord semi-finished products. Furthermore, the transport trolley is provided with a lifting platform, and the angle steel, the main chord body and the main chord semi-finished product can be placed on the lifting platform. When the lifting platform descends, the transport trolley can carry the angle steel, the main chord body and the main chord semi-finished product through the angle steel clamp 110, the square clamp 210, the first main chord clamp 310, the second main chord clamp 410, the first material rack and the machining equipment; when the lifting platform rises, it is convenient for the angle steel clamp 110 to clamp the angle steel or loosen the angle steel, and it is convenient for the square clamp 210, the first main chord clamp 310, and the second main chord clamp 410 to clamp the main chord body or loosen the main chord body, so as to place the main chord semi-finished product on the first material rack or receive the main chord from the first material rack.

[0044] A loading mechanism for pasting plates, inserting plates and lining plates is provided next to the first conveying mechanism 120; the second conveying mechanism 320 and the third welding manipulator 330 are respectively arranged at the front and rear of the first main chord fixture 310 to avoid interference between the second conveying mechanism 320 and the third welding manipulator 330, and a loading mechanism for steps and node plates is provided next to the second conveying mechanism 320.

[0045] An angle steel sorting and loading unit 700 is provided in front of the angle steel inner side attachment processing unit 100. The angle steel sorting and loading unit 700 includes a truss transport mechanism 710 and a second material rack 720. The truss transport mechanism 710 is arranged across the second material rack 720. The truss transport mechanism 710 can be used to transport the angle steels and arrange them on the second material rack 720. Since the incoming angle steels are piled together, it is inconvenient to take the angle steels one by one. By lifting the angle steels through the truss transport mechanism 710 and arranging them one by one on the second material rack 720, the angle steels can be used conveniently and quickly. In some embodiments, the truss transport mechanism 710 extends to the top of the angle steel fixture 110, and the angle steels can be transported to the angle steel fixture 110 through the truss transport mechanism 710. An incoming material inspection station is provided in front of the angle steel sorting and loading unit 700, and the angle steels, pasting plates, insert plates, lining plates, foot plates and node plates are inspected respectively to remove defective incoming materials.

[0046] The machining equipment includes a gantry cutting machine and a gantry boring and milling machine, which are arranged in sequence. The gantry cutting machine is provided with a plasma hole cutting device, which can be used to pre-open holes for the semi-finished main chord rod, and the gantry boring and milling machine can be used to bore holes for the semi-finished main chord rod and mill the end faces of the semi-finished main chord rod. First, the plasma hole cutting device pre-opens a small hole on the semi-finished main chord rod, and then the gantry boring and milling machine processes the small hole until a hole that meets the design requirements is processed. The gantry boring and milling machine can process the end face of the semi-finished main chord rod, so that the flatness of the end face of the semi-finished main chord rod is guaranteed.

[0047] The semi-finished main chord side wall opening unit 600 further includes a third main chord fixture, which is arranged below the plasma hole cutting device. The semi-finished main chord is positioned on the third main chord fixture, which facilitates the plasma hole cutting device to open a hole on the semi-finished main chord.

[0048] The angle steel inner side attachment processing unit 100 further includes a first transport slide 140 and a first welding slide 150. The first transport mechanism 120 and the first welding manipulator 130 are respectively arranged on the first transport slide 140 and the first welding slide 150. The first transport slide 140, the first welding slide 150 and the angle steel fixture 110 are parallel to each other. The first transport mechanism 120 can slide on the first transport slide 140, ensuring that the first transport mechanism 120 can position the pasting plate, the inserting plate and the inner lining plate at the corresponding positions on the angle steel, avoiding the blind spots on the angle steel that the first transport mechanism 120 cannot reach; the first welding manipulator 130 can slide on the first welding slide 150, ensuring that the first welding manipulator 130 can weld the pasting plate, the inserting plate and the inner lining plate at the corresponding positions on the angle steel, avoiding the blind spots on the angle steel that the first welding manipulator 130 cannot reach.

[0049] It can be understood that the main chord body outer side accessory processing unit 300 further includes a second transport slide 340 and a second welding slide 350, which are respectively arranged at the front and rear of the first main chord fixture 310, the second transport slide 340, the second welding slide 350 and the first main chord fixture 310 are parallel to each other, and the second transport mechanism 320 and the third welding manipulator 330 are respectively arranged on the second transport slide 340 and the second welding slide 350. The full welding unit 400 further includes a third welding slide 430, which are parallel to the second main chord fixture 410, and the fourth welding manipulator 420 is arranged on the third welding slide 430. The transport trolley can carry the main chord and pass under the second transport slide 340, the second welding slide 350 and the third welding slide 430.

[0050] The tenon-type standard section main chord production line includes a main chord semi-finished product inspection unit, which includes a main chord semi-finished product material rack for temporarily storing the main chord semi-finished products. The main chord semi-finished products are placed on the main chord semi-finished product material rack to facilitate inspection of the main chord semi-finished products.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A production process for a tenon-type standard section main chord, characterized in that: The following steps are included: Incoming material inspection: Check whether the structural dimensions of the inner and outer accessories and angle steels are qualified and whether there are any defects in appearance; Welding of the inner accessories of the angle steel: weld the inner accessories to the designated position inside the angle steel. The inner accessories include the plate, the plug plate and the inner lining plate. Angle steel square: two angle steels with welded inner attachments are squared and welded together to form the main chord body; Welding of the outer side accessories of the main chord body: weld the outer side accessories to the designated position on the outer side of the main chord body, the outer side accessories include the footrest and the node plate, to form the semi-finished product of the main chord; Main chord semi-finished product calibration: flame heating is used to calibrate the main chord semi-finished product under high temperature conditions; Main chord semi-finished product inspection: inspect the straightness and weld appearance of the main chord semi-finished product; Opening holes in the side wall of the semi-finished main chord: opening connecting holes at designated positions on the side wall of the semi-finished main chord; Processing the end face of the semi-finished main chord: milling the end face of the semi-finished main chord to obtain the finished main chord.

2. The tenon-type standard section main chord production process according to claim 1 is characterized in that: In the step of square-joining the angle steels, the two angle steels with welded inner accessories are first positioned and welded together by spot welding. In the step of welding the outer accessories of the main chord body, the outer accessories are first positioned and welded to the outside of the main chord body by spot welding, and then the gap between the two angle steels and the gap between the outer accessories and the side wall of the main chord body are completely welded and sealed.

3. The production process of the tenon-type standard section main chord according to claim 2 is characterized in that: The gap between the two angle steels and the gap between the outer attachment and the side wall of the main chord body are sealed by the TANDEM double-wire welding process with high efficiency and low heat input.

4. The tenon-type standard section main chord production process according to claim 1 is characterized in that: In the step of opening a hole in the side wall of the semi-finished main chord rod, a small hole is firstly opened at a designated position of the side wall of the semi-finished main chord rod, and then the small hole is expanded to a connecting hole of a designed size.

5. The production process of the tenon-type standard section main chord according to claim 1 is characterized in that: After the step of opening the side wall of the main chord semi-finished product, there are steps of structural inspection and appearance inspection of the main chord finished product to inspect whether the structural size and structural strength of the main chord finished product are qualified, and to inspect whether the appearance of the main chord finished product has any defects.

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