A main chord rod with integrated circular tenon joint and a standard section for tower cranes

Abstract

The present invention provides a main chord with an integrated circular tenon joint and a tower crane standard section. The integrated main chord with a circular tenon joint includes a main chord main rod, and a female joint and a male joint integrally extending axially outward from both ends of the main chord main rod along the length of the main chord main rod. The female joint is provided with a mortise hole and a mortise sealing core rod fixed therein for sealing one end of the main chord main rod. The male joint is provided with a tenon section and a tenon sealing core rod fixed therein for sealing one end of the main chord main rod. The aperture of the mortise hole of the female joint and the outer diameter of the tenon section of the male joint are in a clearance fit relationship with the same nominal size. In this application, the connection between the female joint and the male joint and the main chord main rod is free of welded joints, connecting sleeves, welds, and welding stress, thereby enhancing safety and reliability. Furthermore, the installation and disassembly of two adjacent tower crane standard sections is convenient and labor-saving, and regular safety inspections of the joints of each tower crane standard section are not required during use.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery production, in particular to a main chord rod with an integrated circular tenon joint and a tower crane standard section with the main chord rod with an integrated circular tenon joint. Background Art

[0002] Tower cranes are a typical type of construction machinery, widely used for lifting in construction and various engineering projects. The tower crane (or tower crane for short) is primarily composed of multiple tower crane standard sections connected vertically. These sections, often called tower crane standard sections or simply standard sections, are crucial components of the tower crane. The standard sections must be erected to the same height as the tower crane. They bear the weight of the entire tower crane, the load of the hoisted object, and other loads such as wind load, and are therefore subject to significant stress.

[0003] Conventional tower sections typically consist of four main chords and other web members welded into a crisscross pattern. The main chords are constructed from square and rectangular tubes and round tubes welded together from cold-bent square steel tubes and hot-rolled angle steel. The upper and lower tower sections can be connected in two ways: 1. Connecting via high-strength bolted sleeves, two or three sleeves are welded to the upper and lower ends of the four main chords and then secured together with high-strength bolts. 2. Connecting via tenon-positioned transverse pins, male and female tenons are welded to the upper and lower ends of the four main chords.

[0004] Currently, the most commonly used connection method is the first type, which uses high-strength bolts on the sleeve. However, its disadvantages are time-consuming assembly and disassembly. Safety inspections during use require that every bolt and sleeve be inspected, which is labor-intensive and time-consuming, and is currently being phased out. The second type, which uses a tenon-positioned transverse pin, avoids the problems associated with high-strength bolts on the sleeve and is therefore very popular. However, the tenons, one male and one female, on the main chord are butt-welded flush to the main chord, placing high demands on the welding process and increasing processing costs. Furthermore, residual stress concentration in the weld seam significantly affects the weld fatigue strength, and the weld scar surface is not smooth, affecting the appearance. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a main chord rod with an integrated circular tenon joint, which adopts an integrated circular tenon joint structure to improve safety and reliability.

[0006] To achieve the above-mentioned objectives, the present invention provides an integrated main chord rod with a circular tenon joint, comprising a main chord rod and a female joint and a male joint integrally extending axially outward from both ends of the main chord rod along the length direction of the main chord rod, wherein the female joint is provided with a mortise hole and a mortise sealing core rod fixed inside for sealing one end of the main chord rod, and the male joint is provided with a tenon section and a tenon sealing core rod fixed inside for sealing one end of the main chord rod, and the aperture of the mortise hole of the female joint and the outer diameter of the tenon section of the male joint have a clearance fit relationship with the same nominal size.

[0007] Furthermore, the female connector is integrally provided at the end of the main chord and main rod by the following processing technology:

[0008] A1. Preparing a main rod tube blank constituting the main chord and main rod, thermally expanding one end of the main rod tube blank for forming a female joint, and thermally expanding an expanded diameter section at the end of the main rod tube blank, wherein the wall thickness of the expanded diameter section is consistent with the wall thickness of the main rod tube blank;

[0009] A2. Hot forging the expanded diameter section using a hot forging device: the hot forging device includes a heating machine, a first rotary forging machine, an inner core die, a tie rod, and a pipe clamping bracket; the first rotary forging machine has a plurality of first rotary forging rollers uniformly distributed circumferentially, and a first rotary forging space surrounded by the plurality of first rotary forging rollers, the first rotary forging rollers being rotatable around their own axes and radially movable; the outer periphery of the upper end of the inner core die is fixedly provided with a rib portion, and the interior is provided with a center hole for accommodating the tie rod; the end of the tie rod is provided with a screw segment, and the end surface of the mortise sealing core rod is provided with a threaded hole threadedly connected to the screw segment; the pipe clamping bracket is used to clamp the main rod tube blank, the pipe clamping bracket is rotatable and axially movable, and the first rotary forging space and the pipe clamping bracket can be coaxial;

[0010] A3. Turn on the heating machine and heat the expanded section to 750-850°C;

[0011] A4. Tighten the screw section of the pull rod into the threaded hole of the mortise plugging mandrel, insert the pull rod into the center hole of the inner core mold, and lock it. Place the inner core mold and the mortise plugging mandrel into the first swaging cavity, and make the end face of the rib facing the first swaging cavity flush with the end face of the first swaging roller.

[0012] A5. Clamp the heated main rod tube into the tube clamping bracket. The tube clamping bracket drives the expanded diameter section into the first rotary forging space of the first rotary forging machine until the expanded diameter section abuts against the flange portion.

[0013] A6. Turn on the first rotary swaging machine and the pipe clamping bracket, and rotary swage the expanded section to reduce its outer diameter and increase its wall thickness until the inner wall of the expanded section securely clamps the mortise and seals the outer wall of the mandrel, and the outer diameter of the expanded section is reduced to the outer diameter of the main rod blank, thereby hot forging the expanded section into a female joint.

[0014] A7. Open the first rotary forging roller, release the lock between the pull rod and the inner core mold, rotate the pull rod in the opposite direction until the screw segment is unscrewed from the threaded hole of the mortise sealing core rod, pull out the pull rod, pull the inner core mold out of the female joint, and use the pipe clamping bracket to drive the main rod tube blank out of the first rotary forging empty area of ​​the first rotary forging machine.

[0015] Furthermore, the male connector is integrally provided at the end of the main chord and main rod by the following processing technology:

[0016] B1. Prepare a main rod tube blank constituting the main chord rod and use a hot forging device to hot forge one end of the main rod tube blank for forming a male connector: the hot forging device includes a heating machine, a second rotary forging machine, a third rotary forging machine, a sidewall roller, a pull rod, and a pipe clamping bracket; the second rotary forging machine has a plurality of second rotary forging rollers uniformly distributed in the circumferential direction, and a second rotary forging space surrounded by the plurality of second rotary forging rollers, the second rotary forging rollers being rotatable about their own axes and radially movable, and having a first rotary forging shoulder; the third rotary forging machine has a plurality of third rotary forging rollers uniformly distributed in the circumferential direction, and a second rotary forging space surrounded by the plurality of third rotary forging rollers The third rotary swaging roller is capable of rotating about its own axis and moving radially, and is provided with a second rotary swaging shoulder; the shoulder angle of the first rotary swaging shoulder is smaller than the shoulder angle of the second rotary swaging shoulder; a central hole for accommodating a pull rod is provided in the side guard roller; a screw section is provided at the end of the pull rod, and a threaded hole threadedly connected to the screw section is provided on the end surface of the tenon sealing core rod; the pipe clamping bracket is used to clamp the main rod tube blank, the pipe clamping bracket is capable of rotating and moving axially, the second rotary swaging roller can be coaxial with the pipe clamping bracket, and the third rotary swaging roller can be coaxial with the pipe clamping bracket;

[0017] B2. Turn on the heating machine to heat the end of the main rod tube blank used for forming the male connector to 750-850° C.

[0018] B3. Pass the screw section of the pull rod through the center hole of the side guard roller and tighten it into the threaded hole of the tenon plugging mandrel. Then, lock the lever and the side guard roller so that the side guard roller and the tenon plugging mandrel abut against each other. Place the tenon plugging mandrel into the second swaging empty area, and make the end face of the side guard roller facing the second swaging empty area flush with the end face of the second swaging roller.

[0019] B4. Clamp the heated main tube blank in the tube clamping bracket. The tube clamping bracket drives the end of the main tube blank for forming the male connector into the second swaging space of the second rotary swaging machine until the end of the main tube blank abuts against the sidewall roller.

[0020] B5. Turn on the second rotary swaging machine and the tube clamping bracket to rotary swage one end of the main rod tube blank for forming the male connector until the outer diameter of the end is reduced to a predetermined size, thereby hot forging the male connector tube blank at the end of the main rod tube blank;

[0021] B6. Open the second rotary swaging roller and rotate the pull rod in the opposite direction until the screw segment is unscrewed from the threaded hole of the tenon plugging mandrel. The pipe clamping bracket drives the main rod tube blank out of the second rotary swaging empty area of ​​the second rotary swaging machine.

[0022] B7, transferring the main rod tube from the tube clamping support to a heating machine; turning on the heating machine to heat the male joint tube to 750-850° C.;

[0023] B8, maintaining the side guard roller at the end of the third rotary forging roller so that the end surface of the side guard roller facing the third rotary forging empty area is flush with the end surface of the third rotary forging roller;

[0024] B9. Clamp the heated main rod tube into the tube clamping bracket, and the tube clamping bracket drives the male joint tube into the third rotary forging space of the third rotary forging machine;

[0025] B10. Turning on the third rotary swaging machine and the pipe clamping support, rotary swaging the male joint tube blank. Simultaneously, the pipe clamping support drives the male joint tube blank toward the sidewall roller until the male joint tube blank abuts against the sidewall roller and the outer diameter of the male joint tube blank is reduced to a predetermined size, thereby hot forging the male joint tube blank into a male joint.

[0026] B11. Open the third rotary forging roller, and the pipe clamping bracket drives the main rod tube blank to move out of the third rotary forging empty area of ​​the third rotary forging machine.

[0027] Furthermore, a first fixing pin hole is provided in the female joint, and the first fixing pin hole passes through the female joint in a radial direction of the female joint and in a direction perpendicular to the axis of the main chord and main rod.

[0028] Furthermore, the mortise sealing core rod includes a first cylindrical section, a first conical transition section, and a second cylindrical section distributed in sequence along the direction close to the main chord and main rod, the outer diameter of the first cylindrical section is smaller than the outer diameter of the second cylindrical section, and the first cylindrical section, the first conical transition section and the second cylindrical section are all clamped with the female joint without gap; a radially recessed first sealing groove is provided on the outer peripheral surface of the mortise sealing core rod at the connection point between the first cylindrical section and the first conical transition section, and a first sealing flange is provided on the inner wall of the female joint that is engaged in the first sealing groove.

[0029] Furthermore, the end face of the tenon section is flush with the end face of the tenon sealing core rod, and a second fixing pin hole is opened in the tenon section and the tenon sealing core rod, and the second fixing pin hole passes through the tenon section and the tenon sealing core rod along the radial direction of the male joint and the direction perpendicular to the main chord and main rod axis.

[0030] Furthermore, the tenon sealing core rod includes a third cylindrical section, a second conical transition section, and a fourth cylindrical section distributed in sequence along the direction close to the main chord and main rod, the third cylindrical section is distributed in the tenon section, the outer diameter of the third cylindrical section is smaller than the outer diameter of the fourth cylindrical section, and the third cylindrical section, the second conical transition section and the fourth cylindrical section are all clamped with the male joint without gap; the tenon sealing core rod is provided with a radially recessed second sealing groove on the outer circumferential surface of the third cylindrical section, and a radially recessed third sealing groove is provided at the connection between the third cylindrical section and the second conical transition section, and the inner wall of the male joint is provided with a second sealing flange engaged in the second sealing groove, and a third sealing flange engaged in the third sealing groove.

[0031] Furthermore, the wall thickness of the female joint is greater than the wall thickness of the main chord and main rod, and the wall thickness of the male joint is greater than the wall thickness of the main chord and main rod.

[0032] Furthermore, the main chord rod, main rod, female joint and male joint are all circular tube structures, and the outer diameter of the main chord rod is the same as the outer diameter of the female joint.

[0033] The present application also provides a standard section of a tower crane, comprising four main chord rods with integrated circular tenon joints as described above, wherein the four main chord rods with integrated circular tenon joints are distributed at four corners, and several web rods are welded between two adjacent main chord rods with integrated circular tenon joints.

[0034] As described above, the main chord rod with integrated round tenon joint and the tower crane standard section of the present invention have the following beneficial effects:

[0035] In the present application, the female joint and the male joint are integrally arranged at both ends of the main chord and the main rod. There are no welded joints and connecting sleeves at the connection, and there are no welds, so there is no welding stress. Therefore, the circular tenon joint integrated main chord involved in the present application is safer and more reliable. At the same time, it is connected and fixed by accurately positioning the male joint and the female joint in two adjacent tower crane standard sections, and then fixed and locked with pins and other components. Installation and disassembly are convenient and labor-saving, and there is no need to regularly conduct safety inspections on the joints of each tower crane standard section during use. In addition, the outer side of the circular tenon joint integrated main chord also serves as a guide rail for the climbing frame. Since the connection between the female joint and the male joint and the main chord and the main rod in the present application is smooth and free of welding scars, the misalignment between the female joint and the male joint is smaller, which can greatly reduce the lifting resistance and vibration of the climbing frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural diagram of a single tower crane standard section in this application, which is the main view.

[0037] Figure 2 for Figure 1 Top view of .

[0038] Figure 3 This is a schematic structural diagram of a single main chord rod with an integrated round tenon joint in this application.

[0039] Figure 4 for Figure 3 Enlarged view of the P1 box.

[0040] Figure 5 for Figure 4 Schematic diagram of the structure of the mortise sealing core rod.

[0041] Figure 6 for Figure 3 Enlarged view of the P2 box.

[0042] Figure 7 for Figure 6 Schematic diagram of the structure of the middle tenon plugging core rod.

[0043] Figure 8 This is a schematic diagram of the structure of the main rod tube blank after thermal expansion in step A1 of this application.

[0044] Figure 9 This is a schematic diagram of the structure of the diameter expansion section before hot forging and diameter reduction in this application.

[0045] Figure 10 for Figure 9 Top view of the first rotary swaging machine.

[0046] Figure 11 This is a schematic diagram of the structure of the expanded diameter section after hot forging and diameter reduction in this application.

[0047] Figure 12 This is a structural diagram of the process of hot forging a male joint tube blank from a main rod tube blank in step B5 of this application.

[0048] Figure 13 for Figure 12 Top view of the second rotary swaging machine.

[0049] Figure 14 This is a structural diagram of the male joint blank when hot forging it into a male joint in step B10 of this application.

[0050] Figure 15 for Figure 4 Top view of the third rotary forging machine.

[0051] Figure 16 This is a schematic diagram of the structure of the main rod tube blank of this application after hot forging and before fine processing.

[0052] Figure 17 for Figure 16 Enlarged view of the P3 box.

[0053] Figure 18 for Figure 16Enlarged view of the P4 frame.

[0054] Component number description

[0055] 10 Main chord and main rod

[0056] 20 female connector

[0057] 21 mortise holes

[0058] 22 First fixing pin hole

[0059] 23 First sealing flange

[0060] 30 male connector

[0061] 31 tenon section

[0062] 32 Second fixing pin hole

[0063] 33 Second sealing flange

[0064] 34 Third sealing flange

[0065] 35 Length positioning dimension shoulder

[0066] 40 Mortise Sealing Mandrel

[0067] 41 First cylindrical segment

[0068] 42 First conical transition section

[0069] 43 Second cylindrical segment

[0070] 44 First sealing groove

[0071] 50 Tenon plugging core rod

[0072] 51 Third cylindrical segment

[0073] 52 Second conical transition section

[0074] 53 Fourth cylindrical segment

[0075] 54 Second sealing groove

[0076] 55 Third sealing groove

[0077] 60 main rod tube blank

[0078] 61 expansion section

[0079] 62 Male Connector Blank

[0080] 70 First Rotary Forging Machine

[0081] 71 First rotary forging roller

[0082] 80 inner core mold

[0083] 81 sidewall

[0084] 90 tie rod

[0085] 91 screw segments

[0086] 110 pipe clamp bracket

[0087] 120 Second rotary forging machine

[0088] 121 Second rotary forging roller

[0089] 122 First rotary forging shoulder

[0090] 130 Third Rotary Forging Machine

[0091] 131 Third rotary forging roller

[0092] 132 Second rotary forging shoulder

[0093] 140 side guard roller

[0094] 150 round tenon joint integrated main chord

[0095] 161 First horizontal web member

[0096] 162 Second horizontal web

[0097] 163 Third horizontal web member

[0098] 164 First Oblique Bar

[0099] 165 Second Oblique DETAILED DESCRIPTION

[0100] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0101] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0102] The present application provides a main chord rod 150 with an integrated circular tenon joint, and a standard section of a tower crane including the main chord rod 150 with an integrated circular tenon joint. The standard section of the tower crane will be referred to as the standard section hereinafter.

[0103] The tower crane contains multiple standard sections, which are spliced ​​from top to bottom to form the tower crane tower. Figure 1 and Figure 2 As shown, each tower crane standard section includes four circular tenon joint integrated main chord rods 150, which are distributed at four corners, and a number of web members are welded between two adjacent circular tenon joint integrated main chord rods 150. Figure 3 、 Figure 4 and Figure 6 As shown, the round tenon joint integrated main chord 150 involved in the present application includes a vertically extending main chord main rod 10, and a female joint 20 and a male joint 30 integrally extending axially from the upper and lower ends of the main chord main rod 10 along the length direction of the main chord main rod 10; in this embodiment, the female joint 20 integrally extends upward from the upper end of the main chord main rod 10, and the male joint 30 integrally extends downward from the lower end of the main chord main rod 10; of course, in other embodiments, the male joint 30 may also integrally extend upward from the upper end of the main chord main rod 10, and the female joint 20 integrally extends downward from the lower end of the main chord main rod 10.

[0104] like Figure 3 、 Figure 4 and Figure 6 As shown, the main chord rod 150 of the circular tenon joint is processed from a tube blank, and the main chord rod 10 constituting its main body is a hollow tube structure; and a mortise hole 21 is provided in the female joint 20, and a mortise sealing core rod 40 for sealing the upper end of the main chord rod 10 is fixed inside the female joint 20; the male joint 30 is provided with a tenon section 31, and a tenon sealing core rod 50 for sealing the lower end of the main chord rod 10 is fixed inside the male joint 30, and a length positioning dimension shoulder 35 is formed on the outer peripheral side of the male joint 30 at the upper end of the tenon section 31; the aperture of the mortise hole 21 of the female joint 20 and the outer diameter of the tenon section 31 of the male joint 30 have a clearance fit relationship with the same nominal size. In this way, when splicing the upper and lower standard sections, the tenon section 31 of the male joint 30 at the lower end of the integrated main chord rod 150 of the round tenon joint in the upper standard section is inserted into the mortise hole 21 of the female joint 20 at the upper end of the integrated main chord rod 150 of the round tenon joint in the lower standard section. The nominal sizes of the two are the same and they are in a clearance fit relationship, thus realizing the accurate positioning, connection and fixation between the tenon section 31 at the lower end of the upper standard section and the mortise hole 21 at the upper end of the lower standard section. The operation is very convenient, saving time and effort. After splicing, the female joint 20 and the male joint 30 can be locked and fixed.

[0105] In the circular tenon joint integrated main chord 150 of the present application, the female joint 20 and the male joint 30 are integrally arranged at the upper and lower ends of the main chord main bar 10. Consequently, the connections between the female joint 20 and the main chord main bar 10, as well as the connections between the male joint 30 and the main chord main bar 10, are free of welded joints, sleeves, or weld seams, eliminating welding stress. Therefore, the circular tenon joint integrated main chord 150 of the present application is safer and more reliable. Furthermore, the precise positioning, connection, and fixation of the male and female joints 30 and 20 in two adjacent tower crane standard sections are achieved, making installation and disassembly easy and labor-saving. Regular safety inspections of the joints in each tower crane standard section are also unnecessary during use. Furthermore, the outer sides of the four circular tenon joint integrated main chords 150 also serve as guide rails for the climbing frame. Because the connections between the female and male joints 20 and 30 and the main chord main bar 10 are smooth and free of weld scars, the misalignment between the female and male joints 20 and 30 is minimized, significantly reducing the lifting resistance and vibration of the climbing frame. In addition, the upper and lower ends of the main chord main rod 10 are sealed by the mortise sealing core rod 40 and the tenon sealing core rod 50 respectively. When the standard section is used outdoors, rainwater is prevented from entering the main chord main rod 10, thereby avoiding the phenomenon of ice swelling in winter due to water ingress.

[0106] Further, if Figure 2 and Figure 3 As shown, the tube blank used to manufacture the circular tenon joint integrated main chord 150 is a thick-walled circular tube, so the main chord rod 10, female connector 20 and male connector 30 of the circular tenon joint integrated main chord 150 are all circular tube structures. Preferably, the outer diameter of the main chord rod 10 is the same as the outer diameter of the female connector 20. Figure 1 and Figure 2 As shown, the four main chords 150 with integrated circular tenon joints in the standard section are arranged at the four corners of a square, forming a hollow square standard section. The spacing between two adjacent main chords 150 with integrated circular tenon joints is equal. Thus, the standard section has the following dimensions: height H, width W, axial center distance C of the main chords 150 with integrated circular tenon joints, and diagonal D. These dimensions may vary between different machine models and manufacturers. Furthermore, the outer diameter of the main chord main rod 10 and the outer diameter of the female joint 20 are both φ1. The diameter of the mortise hole 21 of the female joint 20 is φ2, and the outer diameter of the tenon section 31 of the male joint 30 is φ3. The diameters φ2 and φ3 of the mortise hole 21 and the tenon section 31 are the same engineering dimensions and are selected with clearance fit tolerances. The design dimensions of φ2 and φ3 are approximately 70% of the design dimension of the main chord main rod outer diameter φ1.

[0107] Further, if Figure 1As shown, several web members welded between two adjacent round tenon joint integrated main chord members 150 include a first horizontal web member 161, a second horizontal web member 162, a third horizontal web member 163, a first diagonal web member 164, and a second diagonal web member 165. The first horizontal web member 161, the second horizontal web member 162 and the third horizontal web member 163 are distributed in sequence from top to bottom and all extend horizontally. The first diagonal web member 164 is distributed between the first horizontal web member 161 and the second horizontal web member 162, and the second diagonal web member 165 is distributed between the second horizontal web member 162 and the third horizontal web member 163. The first diagonal web member 164 and the second diagonal web member 165 are symmetrically arranged relative to the second horizontal web member 162. The cross sections of the first horizontal web member 161 , the second horizontal web member 162 , the third horizontal web member 163 , the first diagonal web member 164 and the second diagonal web member 165 are all circular, and the ends of each web member and the joints with the main chord and main rod 10 are cut into intersecting lines and beveled and continuously welded.

[0108] Preferably, if Figure 3 and Figure 4 As shown, a first fixing pin hole 22 is opened in the female joint 20, and the first fixing pin hole 22 passes through the female joint 20 in the radial direction of the female joint 20 and in the direction perpendicular to the axis of the main chord rod 10, that is, the first fixing pin hole 22 is perpendicular to the axis of the female joint 20. Figure 3 and Figure 6 As shown, the lower end surface of the tenon section 31 is flush with the lower end surface of the tenon plugging core rod 50. A second fixing pin hole 32 is formed in the tenon section 31 and the tenon plugging core rod 50. The second fixing pin hole 32 passes through the tenon section 31 and the tenon plugging core rod 50 in a radial direction of the male connector 30 and in a direction perpendicular to the axis of the main chord and main rod 10. That is, the second fixing pin hole 32 is perpendicular to the axis of the male connector 30. The first fixing pin hole 22 and the second fixing pin hole 32 are of uniform size and have the same tolerance. That is, the first fixing pin hole 22 and the second fixing pin hole 32 have the same diameter and tolerance and are at the same angle on the circumference. During splicing, after the tenon section 31 of the male connector 30 at the lower end of the upper standard section is inserted into the mortise hole 21 of the female connector 20 at the upper end of the lower standard section, the second fixing pin hole 32 at the lower end of the upper standard section is aligned with the first fixing pin hole 22 at the upper end of the lower standard section. Then, positioning pins can be inserted into the first fixing pin hole 22 and the second fixing pin hole 32. When the positioning pins are fixed or locked, the male connector 30 at the lower end of the upper standard section is fixedly connected to the female connector 20 at the upper end of the lower standard section, thereby achieving positioning and tightening. The installation and disassembly are convenient and easy, and the connection is more reliable.

[0109] Further, if Figure 4 and Figure 5As shown, the mortise sealing mandrel 40 includes a first cylindrical section 41, a first conical transition section 42, and a second cylindrical section 43, which are arranged sequentially from top to bottom along the direction near the main chord and main rod 10. The outer diameter of the first cylindrical section 41 is smaller than that of the second cylindrical section 43. The first cylindrical section 41, the first conical transition section 42, and the second cylindrical section 43 all clamp tightly against the inner wall of the female connector 20, ensuring a gap-free fit. A radially recessed first sealing groove 44 is defined on the outer circumference of the mortise sealing mandrel 40 at the junction of the first cylindrical section 41 and the first conical transition section 42. The inner wall of the female connector 20 is provided with a first sealing flange 23 that engages with the first sealing groove 44. This ensures a gap-free and more secure seal, improving the sealing performance between the mortise sealing mandrel 40 and the inner wall of the female connector 20. Preferably, the mortise plugging mandrel 40 has a maximum outer diameter φ7 at the second cylindrical section 43 , which is equal to the inner hole size of the main chord and main rod 10 ; the mortise plugging mandrel 40 has a minimum outer diameter φ8 at the first cylindrical section 41 .

[0110] Further, if Figure 6 and Figure 7 As shown, the tenon sealing core rod 50 includes a third cylindrical section 51, a second conical transition section 52, and a fourth cylindrical section 53, which are distributed in sequence from bottom to top along the direction close to the main chord and main rod 10. The third cylindrical section 51 is distributed in the tenon section 31, and the outer diameter of the third cylindrical section 51 is smaller than the outer diameter of the fourth cylindrical section 53. The third cylindrical section 51, the second conical transition section 52 and the fourth cylindrical section 53 are all clamped with the inner wall of the male joint 30 without gap; the tenon sealing core rod 50 is provided with a radially recessed second sealing groove 54 on the outer peripheral surface of the third cylindrical section 51, and a radially recessed third sealing groove 55 is provided at the connection between the third cylindrical section 51 and the second conical transition section 52. The inner wall of the male joint 30 is provided with a second sealing flange 33 that is engaged in the second sealing groove 54, and a third sealing flange 34 that is engaged in the third sealing groove 55. This ensures a gap-free, more secure seal, improving the sealing between the tenon sealing mandrel 50 and the inner wall of the male connector 30 while also increasing the bending strength of the tenon section 31. Preferably, the tenon sealing mandrel 50 has a maximum outer diameter of φ6 at the fourth cylindrical section 53, which is equal to the inner diameter of the main chord and main rod 10.

[0111] Furthermore, the female connector 20 and the male connector 30 at the upper and lower ends of the main chord 150 are formed directly on the main chord rod 10 through the following hot forging process. Specifically, the female connector 20 is integrally provided on the upper end of the main chord rod 10 through the following processing:

[0112] Step A1: Prepare the main rod tube 60 constituting the main chord rod 10. The main rod tube 60 is a circular tube extending vertically. Use a heat expansion machine to heat expand the upper end of the main rod tube 60. During the heat expansion, heat the upper end of the main rod tube 60 locally to 750-850°C with a medium frequency. Heat expand the upper end of the main rod tube 60 to form an expanded diameter section 61. Figure 8 The outer diameter of the expanded diameter section 61 is 1.5 times the outer diameter of the main chord main rod 10, and the wall thickness of the expanded diameter section 61 is consistent with the wall thickness of the main rod tube 60, that is, the wall thickness of the expanded diameter section 61 is not thinned.

[0113] Step A2: hot forging the diameter expansion section 61 using a hot forging device: Figure 9 As shown, the hot forging device includes a heating machine, a first rotary forging machine 70, an inner core die 80, a pull rod 90 and a pipe clamping bracket 110; Figure 9 and Figure 10 As shown, the first rotary forging machine 70 has three first rotary forging rollers 71 uniformly distributed in the circumferential direction, and a first rotary forging empty area surrounded by several first rotary forging rollers 71. The first rotary forging rollers 71 can rotate around their own axes and can move radially. When moving radially, the first rotary forging rollers 71 can approach the pipe fittings to be swaged in the first rotary forging empty area. The first rotary forging rollers 71 are cylindrical rollers; the outer periphery of the upper end of the inner core mold 80 is fixed with a retaining edge portion 81 extending horizontally outward, and the interior of the inner core mold 80 is provided with a center hole for accommodating the pull rod 90 to pass through, and the outer peripheral surface of the inner core mold 80 has a demoulding taper; the lower end of the pull rod 90 is provided with a screw section 91, and the end face of the mortise sealing core rod 40 is provided with a threaded hole threadedly connected to the screw section 91; the pipe clamping bracket 110 is used to clamp the main rod tube blank 60, and the pipe clamping bracket 110 is rotatable and axially movable; the first rotary forging empty area and the pipe clamping bracket 110 can be coaxial.

[0114] Step A3: Turn on the heating machine to heat the expanded diameter section 61 at the upper end of the main rod tube 60 to 750-850° C. by high frequency heating.

[0115] Step A4: Figure 9 As shown, the screw section 91 of the pull rod 90 is tightened into the threaded hole of the mortise sealing core rod 40, and the pull rod 90 is inserted into the center hole of the inner core mold 80. After confirming the axial position, it is locked. The locking method can be to screw a locking nut into the pull rod 90, and the locking nut is tightened against the upper end face of the inner core mold 80; the inner core mold 80 and the mortise sealing core rod 40 are placed in the first swaging empty area, and the lower end face of the retaining edge 81 facing the first swaging empty area is flush with the end face of the first swaging roller 71.

[0116] Step A5: Clamp the heated main rod tube 60 in the tube clamping bracket 110. By moving the tube clamping bracket 110, the expanded diameter section 61 is driven upward to be inserted into the first swaging space of the first swaging machine 70 until the expanded diameter section 61 abuts against the lower end surface of the retaining edge 81.

[0117] Step A6: Turn on the first rotary swaging machine 70 and the pipe clamping support 110. The first rotary swaging roller 71 moves radially inward to swage the diameter-expanding section 61, thereby reducing the outer diameter of the diameter-expanding section 61 and increasing the wall thickness. This is done until the inner wall of the diameter-expanding section 61 firmly clamps the outer wall of the mortise and seals the mandrel 40, and the outer diameter of the diameter-expanding section 61 is reduced to the outer diameter of the main tube 60. Figure 11 As shown, the expanded diameter section 61 is hot forged into the female connector 20. The outer diameter of the female connector 20 is consistent with the outer diameter of the main rod tube 60, and thus consistent with the outer diameter of the main chord rod 10. This step A6 is a hot forging process that reduces the diameter and increases the wall thickness, while the axial length remains unchanged. During hot forging, the wall thickness increases by approximately 2.3 times. The increased wall thickness of the steel tube securely clamps the mortise sealing mandrel 40 and the inner core mold 80, ultimately making the wall thickness of the female connector 20 greater than that of the main chord rod 10, thereby improving the structural strength of the female connector 20 and preventing the subsequent reduction in strength of the female connector 20 due to the formation of the first fixing pin hole 22 therein.

[0118] Step A7, stop swaging, open the first swaging roller 71, release the lock between the pull rod 90 and the inner core mold 80, rotate the pull rod 90 in the opposite direction until the screw segment 91 is unscrewed from the threaded hole of the mortise sealing core rod 40, and pull out the pull rod 90; since the inner core mold 80 is provided with a draft angle of a certain taper, the inner core mold 80 will not be clamped, and the inner core mold 80 can be pulled out of the female connector 20, and the pipe clamping bracket 110 drives the main rod tube blank 60 to move out of the first swaging empty area of ​​the first swaging machine 70.

[0119] Furthermore, the male connector 30 is formed and integrally provided at the lower end of the main chord rod 10 by the following processing technology:

[0120] Step B1: Prepare the main rod blank 60 constituting the main chord rod 10. The upper end of the main rod blank 60 has been hot-forged to form the female connector 20 through the above steps A1 to A7. Use a hot forging device to hot-forge the lower end of the main rod blank 60 for forming the male connector 30. Figure 12 and Figure 14 As shown, the hot forging device includes a heating machine, a second rotary forging machine 120, a third rotary forging machine 130, a side guard roller 140, a pull rod 90 and a pipe clamping bracket 110. Figure 12 and Figure 13 As shown, the second rotary swaging machine 120 has three second rotary swaging rollers 121 evenly distributed around the circumference, and a second rotary swaging area surrounded by several second rotary swaging rollers 121. The second rotary swaging rollers 121 can rotate around their own axes and can move radially. When moving radially, the second rotary swaging rollers 121 can approach the pipe section to be swaged in the second rotary swaging area. The outer circumference of the second rotary swaging roller 121 has a first rotary swaging shoulder 122. The shoulder angle of the first rotary swaging shoulder 122 is 30 degrees, that is, the angle between the conical surface of the first rotary swaging shoulder 122 and the vertical center line is 30 degrees. Figure 14 and Figure 15As shown, the third rotary swaging machine 130 has three third rotary swaging rollers 131 evenly distributed around the circumference, and a third rotary swaging area surrounded by these rollers 131. The third rotary swaging rollers 131 can rotate about their own axes and move radially. During radial movement, the third rotary swaging rollers 131 can approach the pipe section to be swaged within the third rotary swaging area. The outer circumferential surface of the third rotary swaging roller 131 has a second rotary swaging shoulder 132. The shoulder angle of the second rotary swaging shoulder 132 is 80°, that is, the angle between the conical surface of the second rotary swaging shoulder 132 and the vertical centerline is 80°. Therefore, the shoulder angle of the first rotary swaging shoulder 122 is smaller than that of the second rotary swaging shoulder 132, and the first rotary swaging shoulder 122 is lower than the second rotary swaging shoulder 132. A central hole is provided in the side guard roller 140 for accommodating the pull rod 90 to pass through; a screw section 91 is provided at the end of the pull rod 90, and a threaded hole threadedly connected to the screw section 91 is provided on the end face of the tenon sealing core rod 50; the tube clamping bracket 110 is used to clamp the main rod tube blank 60, and the tube clamping bracket 110 is rotatable and axially movable; the second rotary forging empty area can be coaxial with the tube clamping bracket 110, and the third rotary forging empty area can be coaxial with the tube clamping bracket 110.

[0121] Step B2: Turn on the heating machine to heat the lower end of the main rod tube 60 to 750-850°C by high frequency heating.

[0122] Step B3: Figure 12 As shown, the screw section 91 of the pull rod 90 is passed through the center hole of the side guard roller 140 and then tightened into the threaded hole of the tenon sealing core rod 50, and the lever and the side guard roller 140 are locked. The locking nut can be used for locking, and the side guard roller 140 is then in contact with the tenon sealing core rod 50; the tenon sealing core rod 50 is placed in the second swaging empty area, and the upper end face of the side guard roller 140 facing the second swaging empty area is flush with the lower end face of the second swaging roller 121.

[0123] Step B4: Figure 12 As shown, the heated main rod tube blank 60 is clamped in the tube clamping bracket 110, and the tube clamping bracket 110 drives the lower end of the main rod tube blank 60 to be inserted downward into the second swaging space of the second swaging machine 120 until the lower end of the main rod tube blank 60 abuts against the side guard roller 140.

[0124] Step B5: Turn on the second rotary forging machine 120 and the pipe clamping support 110, and move the second rotary forging roller 121 with a 30° shoulder angle radially inward to rotary forge the lower end of the main rod tube 60 until the outer diameter of the end is reduced to a preset size. Then, the rotary forging is stopped, thereby hot forging the male joint tube 62 at the end of the main rod tube 60. Figure 12 The male connector tube 62 will reduce its wall thickness while increasing, thereby clamping the third cylindrical section 51 of the tenon plugging the mandrel 50.

[0125] Step B6: Open the second rotary forging roller 121, rotate the pull rod 90 in the opposite direction until the screw segment 91 is unscrewed from the threaded hole of the tenon plugging core rod 50, and the tube clamping bracket 110 drives the main rod tube blank 60 to move out of the second rotary forging empty area of ​​the second rotary forging machine 120.

[0126] Step B7: transfer the main rod tube 60 from the tube clamping bracket 110 to the heating machine; turn on the heating machine and high-frequency heat the male joint tube 62 at the lower end of the main rod tube 60 to 750-850°C, that is, restore the heating temperature of the male joint tube 62 to 750-850°C.

[0127] Step B8: Figure 14 As shown, the side guard roller 140 is held at the end of the third swaging roller 131 so that the end surface of the side guard roller 140 facing the third swaging empty area is flush with the end surface of the third swaging roller 131 .

[0128] Step B9: Figure 14 As shown, the heated main rod tube blank 60 is clamped in the tube clamping bracket 110, and the tube clamping bracket 110 drives the male joint tube blank 62 downward into the third swaging space of the third swaging machine 130 until the lower end of the male joint tube blank 62 abuts against the side guard roller 140.

[0129] Step B10: Turn on the third rotary forging machine 130 and the pipe clamping support 110. The third rotary forging roller 131 with an 80° shoulder angle moves radially inward to forge the male connector tube 62. At the same time, the pipe clamping support 110 also drives the male connector tube 62 to move toward the sidewall roller 140 until the male connector tube 62 abuts against the sidewall roller 140 and the outer diameter of the male connector tube 62 is reduced to a preset size. Thus, the male connector tube 62 is hot forged into the male connector 30, and the 80° shoulder is hot forged. Figure 14 As shown; while the diameter of the male connector 30 is reduced, its wall thickness will increase, thereby clamping the tenon to seal the core rod 50, and at the same time, the 30° shoulder is formed into an 80° shoulder; ultimately, the wall thickness of the male connector 30 is greater than the wall thickness of the main chord main rod 10, thereby improving the structural strength of the male connector 30, and the outer diameter of the male connector 30 becomes smaller, but the cross-sectional area performance parameters are not reduced compared with the main chord main rod 10, and at the same time, it avoids the reduction in strength of the male connector 30 due to the subsequent opening of the second fixing pin hole 32 in the male connector 30.

[0130] Step B11: Open the third rotary forging roller 131 , and the tube clamping bracket 110 drives the main rod tube 60 to move out of the third rotary forging empty area of ​​the third rotary forging machine 130 .

[0131] Therefore, by forging the lower end of the main rod tube blank 60 twice by the second rotary swaging machine 120 and the third rotary swaging machine 130, and by successively increasing the shoulder angles and successively increasing the forging shoulders by the second rotary swaging roller 121 and the third rotary swaging roller 131, the outer diameter and shoulder of the male connector 30 after two forgings can achieve the expected effect. At the same time, the tenon sealing core rod 50 is also firmly clamped, and a second sealing flange 33 clamped in the second sealing groove 54 and a third sealing flange 34 clamped in the third sealing groove 55 are generated, which not only improves the sealing effect, but also improves the strength of the male connector 30, thereby improving the bending resistance of the male connector 30.

[0132] Furthermore, after the main rod tube blank 60 is processed through the above steps A1 to A7 and steps B1 to B11, the blank obtained is as follows: Figures 16 to 18 As shown, the outer diameter of the female connector 20 is identical to the outer diameter φ1 of the main stem tube 60, leaving no trace. The inner hole of the female connector 20 is φ5, with a certain machining allowance for finishing to the diameter φ2 of the mortise hole 21. The outer diameter of the male connector 30 is φ4, with a certain machining allowance for finishing to the outer diameter φ3 of the tenon section 31. Similarly, the length of the main stem tube 60 is finished to the height H of the standard section, with a certain machining allowance.

[0133] Afterwards, the hot-forged main rod blank 60 is machined to make its dimensions meet the design dimensions and tolerances, and the first fixing pin hole 22 and the second fixing pin hole 32 are machined to produce the round tenon joint integrated main chord 150. Figure 4 As shown, the upper end of the mortise hole 21 of the female connector 20 is chamfered at 45°; Figure 6 As shown, the lower end of the tenon section 31 of the male connector 30 is chamfered at 30°; the technical requirements are that the tolerance of the height dimension H is ±0.15mm, the coaxiality of the mortise hole 21 and the tenon section 31 is ≤0.15mm, the verticality of the first fixing pin hole 22 and the mortise hole 21 is ≤0.06, and the verticality of the second fixing pin hole 32 and the tenon section 31 is ≤0.06.

[0134] Finally, the four finely processed circular tenon joint integrated main chords 150 and several webs are positioned using a fixture to ensure that the outer dimensions and diagonal dimensions, as well as the upper ports of the female connectors 20 of the four circular tenon joint integrated main chords 150, are in the same plane. Each web is welded continuously to produce a standard section.

[0135] In summary, this application has the following advantages:

[0136] 1. The female connector 20 and the male connector 30 are integrally arranged at both ends of the main chord rod 10. There are no welded joints and connecting sleeves at the connection, and there is no weld seam, so there is no welding stress, which is safer and more reliable.

[0137] 2. The outer side of the main chord 150 with an integrated round tenon joint also serves as a guide rail for the climbing frame. Since the connection between the female joint 20 and the male joint 30 and the main chord main rod 10 in this application is smooth and has no welding scars, the misalignment between the female joint 20 and the male joint 30 is smaller, which can greatly reduce the lifting resistance and vibration of the climbing frame.

[0138] 3. It adopts round tenon positioning and connection, and positioning pin fixing, which makes installation and disassembly convenient and time-saving. There is no need to conduct regular safety inspections on each standard joint during use.

[0139] 4. The single round tenon joint integrated main chord 150 can be machined before being welded into a standard section, and the length size and tolerance can be fully guaranteed, and the straightness and finish quality of the joint end can also be guaranteed. There is no need to re-machine it after welding into a standard section. Since the existing technology of post-weld processing requires huge equipment, it can greatly reduce costs compared with the existing technology.

[0140] 5. The investment cost of the complete set of process processing equipment for the integrated main chord rod 150 of the round tenon joint and the standard section is less than the investment cost of the process processing equipment for the main chord rod of the existing welded joint, so the overall standard section cost is lower.

[0141] 6. The two ends of the integrated main chord rod 150 of the round tenon joint are sealed with the mortise sealing core rod 40 and the tenon sealing core rod 50, which not only has a good sealing effect, but also can improve the bending strength to a certain extent.

[0142] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0143] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A main chord rod with an integrated round tenon joint, comprising a main chord rod and a main rod (10), characterized in that: It also includes a female joint (20) and a male joint (30) integrally extending axially outward from both ends of the main chord main rod (10) along the length direction of the main chord main rod (10), wherein the female joint (20) is provided with a mortise hole (21) and a mortise sealing core rod (40) fixed therein for sealing one end of the main chord main rod (10), and the male joint (30) is provided with a tenon section (31) and a tenon sealing core rod (50) fixed therein for sealing one end of the main chord main rod (10), and the aperture of the mortise hole (21) of the female joint (20) and the outer diameter of the tenon section (31) of the male joint (30) are in a clearance fit relationship with the same nominal size; A first fixing pin hole (22) is provided in the female joint (20), and the first fixing pin hole (22) passes through the female joint (20) in a radial direction of the female joint (20) and in a direction perpendicular to the axis of the main chord and main rod (10); The mortise sealing core rod (40) comprises a first cylindrical section (41), a first conical transition section (42), and a second cylindrical section (43) which are sequentially distributed along a direction close to the main chord rod (10), the outer diameter of the first cylindrical section (41) is smaller than the outer diameter of the second cylindrical section (43), and the first cylindrical section (41), the first conical transition section (42), and the second cylindrical section (43) are all tightly fitted with the female joint (20) without any gap; a radially concave first sealing groove (44) is provided on the outer peripheral surface of the mortise sealing core rod (40) at the connection between the first cylindrical section (41) and the first conical transition section (42), and a first sealing flange (23) is provided on the inner wall of the female joint (20) and is engaged in the first sealing groove (44); The end face of the tenon section (31) is flush with the end face of the tenon plugging core rod (50), and a second fixing pin hole (32) is provided in the tenon section (31) and the tenon plugging core rod (50). The second fixing pin hole (32) passes through the tenon section (31) and the tenon plugging core rod (50) in a radial direction of the male joint (30) and in a direction perpendicular to the axis of the main chord rod (10); The main chord rod (10), the female joint (20) and the male joint (30) are all circular tube structures, and the outer diameter of the main chord rod (10) is the same as the outer diameter of the female joint (20).

2. The main chord rod with integrated round tenon joint according to claim 1, characterized in that: The tenon plugging core rod (50) comprises a third cylindrical section (51), a second conical transition section (52), and a fourth cylindrical section (53) which are sequentially distributed along the direction close to the main chord rod (10). The third cylindrical section (51) is distributed in the tenon section (31). The outer diameter of the third cylindrical section (51) is smaller than the outer diameter of the fourth cylindrical section (53). The third cylindrical section (51), the second conical transition section (52), and the fourth cylindrical section (53) are all clamped with the male joint (30) to form a gapless fitting. The tenon plugging core rod (50) is provided with a radially recessed second sealing groove (54) on the outer peripheral surface of the third cylindrical section (51), and a radially recessed third sealing groove (55) is provided at the connection between the third cylindrical section (51) and the second conical transition section (52), and the inner wall of the male connector (30) is provided with a second sealing flange (33) engaged in the second sealing groove (54), and a third sealing flange (34) engaged in the third sealing groove (55).

3. The main chord rod with integrated round tenon joint according to claim 1, characterized in that: The wall thickness of the female joint (20) is greater than the wall thickness of the main chord rod (10), and the wall thickness of the male joint (30) is greater than the wall thickness of the main chord rod (10).

4. A process for processing the main chord of the circular tenon joint integration according to claim 1, characterized in that: The female joint (20) is integrally provided at the end of the main chord rod (10) by the following processing technology: A1. preparing a main rod tube blank (60) constituting the main chord rod (10), thermally expanding one end of the main rod tube blank (60) for forming the female connector (20), and thermally expanding an expanded diameter section (61) at the end of the main rod tube blank (60), wherein the wall thickness of the expanded diameter section (61) is consistent with the wall thickness of the main rod tube blank (60); A2. Hot forging the expanded diameter section (61) using a hot forging device: the hot forging device comprises a heating machine, a first rotary forging machine (70), an inner core die (80), a pull rod (90) and a pipe clamping bracket (110); the first rotary forging machine (70) comprises a plurality of first rotary forging rollers (71) uniformly distributed in the circumferential direction, and a first rotary forging empty area surrounded by the plurality of first rotary forging rollers (71); the first rotary forging rollers (71) can rotate around their own axis and can move radially; the inner core die (80) The outer periphery of the upper end is fixedly provided with a retaining edge portion (81), and the interior is provided with a central hole for accommodating a pull rod (90) to pass through; the end of the pull rod (90) is provided with a screw segment (91), and the end surface of the mortise plugging core rod (40) is provided with a threaded hole threadedly connected to the screw segment (91); the pipe clamping bracket (110) is used to clamp the main rod tube blank (60), the pipe clamping bracket (110) is rotatable and axially movable, and the first swaging empty area and the pipe clamping bracket (110) can be coaxial; A3, turning on the heating machine to heat the diameter expansion section (61) to 750-850°C; A4. Tighten the screw section (91) of the pull rod (90) into the threaded hole of the mortise plugging core rod (40), insert the pull rod (90) into the center hole of the inner core mold (80) and lock it; place the inner core mold (80) and the mortise plugging core rod (40) into the first rotary forging empty area, and make the end face of the retaining edge portion (81) facing the first rotary forging empty area flush with the end face of the first rotary forging roller (71); A5. Clamp the heated main rod tube blank (60) in the tube clamping bracket (110). The tube clamping bracket (110) drives the expanded diameter section (61) to be inserted into the first rotary forging space of the first rotary forging machine (70) until the expanded diameter section (61) abuts against the retaining edge (81). A6. Turning on the first rotary swaging machine (70) and the pipe clamping bracket (110), rotary swaging the diameter-expanding section (61), reducing the outer diameter of the diameter-expanding section (61) and increasing the wall thickness, until the inner wall of the diameter-expanding section (61) clamps the outer wall of the mortise sealing core rod (40) and the outer diameter of the diameter-expanding section (61) is reduced to the outer diameter of the main rod tube blank (60), thereby hot forging the diameter-expanding section (61) into a female joint (20); A7. Open the first rotary forging roller (71), release the lock between the pull rod (90) and the inner core mold (80), rotate the pull rod (90) in the opposite direction until the screw segment (91) is screwed out of the threaded hole of the mortise sealing core rod (40), pull out the pull rod (90), pull the inner core mold (80) out of the female connector (20), and use the pipe clamping bracket (110) to drive the main rod tube blank (60) out of the first rotary forging empty area of ​​the first rotary forging machine (70).

5. A process for processing the main chord of the circular tenon joint integration according to claim 1, characterized in that: The male connector (30) is integrally provided at the end of the main chord rod (10) by the following processing technology: B1. Prepare a main rod tube blank (60) constituting the main chord main rod (10), and use a hot forging device to hot forge one end of the main rod tube blank (60) for forming the male connector (30): the hot forging device comprises a heating machine, a second rotary forging machine (120), a third rotary forging machine (130), a side guard roller (140), a pull rod (90) and a pipe clamping bracket (110); the second rotary forging machine (120) has a plurality of circumferentially uniformly distributed second rotary forging rollers (121), and a second rotary forging space surrounded by the plurality of second rotary forging rollers (121), the second rotary forging roller (121) can rotate around its own axis and can move radially, and has a first rotary forging shoulder (122); the third rotary forging machine (130) has a plurality of circumferentially uniformly distributed third rotary forging rollers (131), and a plurality of third rotary forging rollers (131) A third rotary swaging area is formed by a roller (131), the third rotary swaging roller (131) can rotate around its own axis and can move radially, and has a second rotary swaging shoulder (132); the shoulder angle of the first rotary swaging shoulder (122) is smaller than the shoulder angle of the second rotary swaging shoulder (132); a central hole is provided in the side guard roller (140) for accommodating the pull rod (90) to pass through; a screw section (91) is provided at the end of the pull rod (90), and a threaded hole is provided on the end surface of the tenon plugging core rod (50) for threaded connection with the screw section (91); the pipe clamping bracket (110) is used to clamp the main rod tube blank (60), the pipe clamping bracket (110) can rotate and can move axially, the second rotary swaging area and the pipe clamping bracket (110) can be coaxial, and the third rotary swaging area and the pipe clamping bracket (110) can be coaxial; B2, turning on the heating machine to heat one end of the main rod tube blank (60) for forming the male connector (30) to 750-850°C; B3. Pass the screw section (91) of the pull rod (90) through the center hole of the side guard roller (140) and tighten it into the threaded hole of the tenon plugging core rod (50), and lock the pull rod and the side guard roller (140), so that the side guard roller (140) and the tenon plugging core rod (50) are in contact; place the tenon plugging core rod (50) into the second rotary forging empty area, and make the end face of the side guard roller (140) facing the second rotary forging empty area flush with the end face of the second rotary forging roller (121); B4. The heated main rod tube blank (60) is clamped in the tube clamping bracket (110). The tube clamping bracket (110) drives the end of the main rod tube blank (60) for forming the male connector (30) to be inserted into the second swaging space of the second swaging machine (120) until the end of the main rod tube blank (60) abuts against the side guard roller (140); B5, turning on the second rotary swaging machine (120) and the pipe clamping support (110), rotary swaging one end of the main rod tube blank (60) for forming the male connector (30) until the outer diameter of the end is reduced to a preset size, thereby hot forging a male connector tube blank (62) at the end of the main rod tube blank (60); B6, open the second rotary swaging roller (121), rotate the pull rod (90) in the opposite direction until the screw segment (91) is screwed out of the threaded hole of the tenon plugging core rod (50), and the pipe clamping bracket (110) drives the main rod tube blank (60) to move out of the second rotary swaging empty area of ​​the second rotary swaging machine (120); B7, transferring the main rod tube blank (60) from the tube clamping support (110) to a heating machine; turning on the heating machine to heat the male connector tube blank (62) to 750-850°C; B8, maintaining the side guard roller (140) at the end of the third rotary forging roller (131), so that the end surface of the side guard roller (140) facing the third rotary forging empty area is flush with the end surface of the third rotary forging roller (131); B9, clamping the heated main rod tube blank (60) in the tube clamping bracket (110), and the tube clamping bracket (110) drives the male joint tube blank (62) to be inserted into the third rotary forging empty area of ​​the third rotary forging machine (130); B10, turning on the third rotary swaging machine (130) and the pipe clamping support (110), rotary swaging the male joint tube blank (62), and at the same time, the pipe clamping support (110) also drives the male joint tube blank (62) to move toward the side guard roller (140) until the male joint tube blank (62) abuts against the side guard roller (140) and the outer diameter of the male joint tube blank (62) is reduced to a preset size, thereby hot forging the male joint tube blank (62) into the male joint (30); B11. Open the third rotary forging roller (131), and the pipe clamping support (110) drives the main rod tube blank (60) to move out of the third rotary forging empty area of ​​the third rotary forging machine (130).

6. A tower crane standard section, characterized by: The invention comprises four circular tenon joint integrated main chord rods (150) as described in any one of claims 1 to 3, wherein the four circular tenon joint integrated main chord rods (150) are distributed at four corners, and a plurality of web rods are welded between two adjacent circular tenon joint integrated main chord rods (150).

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