Machining process of dovetail joint integrated main chord

Abstract

This invention provides a processing method for an integrated main chord rod with a dovetail joint. The process involves inserting a tenon mandrel into a male connector section at one end of the main chord rod; inserting the male connector section into a heating machine and heating it; hot-extruded the male connector section onto the outer circumference of the tenon mandrel; inserting a female connector section into the heating machine and heating it to a preset temperature; pressing a mortise-sealing sleeve into the female connector section until its outer end is flush with the outer end of the female connector section, creating a large interference fit; moving the main chord rod to a welding platform; welding the outer ends of the mortise-sealing sleeve and the female connector section, as well as the outer ends of the tenon mandrel and the male connector section. In this application, the mortise-sealing sleeve is press-fitted into the female connector section, eliminating the need for a heat-expanding process on the female connector section and simplifying the processing.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery manufacturing technology, and in particular to a processing technology for an integrated main chord rod with a round tenon joint. Background Technology

[0002] Tower cranes are a typical type of engineering machinery, widely used in construction and various engineering lifting operations. The tower body of a tower crane (or simply tower crane) is mainly composed of multiple standard sections connected vertically. These standard sections are crucial components of the tower crane; their height directly matches the height of the tower crane. The standard sections bear the weight of the entire tower crane, the load of the lifted objects, wind loads, and other loads, resulting in a relatively high stress state.

[0003] Typically, a standard section of a crane tower is mainly composed of four main chords and other web members welded into a grid-like structure. There are two ways to connect the upper and lower standard sections of the tower: 1. By connecting with high-strength bolts and connecting sleeves, 2-3 connecting sleeves are welded to the upper and lower ends of the four main chords, and then the connecting sleeves are fixed together with high-strength bolts; 2. By connecting with transverse pins and tenons, male and female tenons are welded to the upper and lower ends of the four main chords, and the connection is made through the male and female tenons.

[0004] Existing technologies have proposed an integrated main chord with a round tenon joint, such as the integrated main chord with a round tenon joint disclosed in Chinese Invention Application No. 202211185083.7. This method involves sequentially processing a female joint at one end of the main chord through hot expansion, heating, inserting a mortise sealing mandrel, and rotary forging; and sequentially processing a male joint at the other end of the main chord through heating, inserting a mortise sealing mandrel, and rotary forging. Because processing the female joint requires first hot-expanding an expanded diameter section, and the wall thickness of the expanded diameter section must match the wall thickness of the main chord, this processing technology is complex, costly, and difficult to implement. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a processing technology for an integrated main chord rod with a dovetail joint that is easy to implement.

[0006] To achieve the above objectives, the present invention provides a processing technology for an integrated main chord with a dovetail joint, comprising the following steps:

[0007] S1. Configure a hot extrusion device, which includes a heating machine, a first extruder, and a second extruder;

[0008] The first extruder includes a fixed first frame, a first idler roller, an extrusion die, a first thrust cylinder, and an ejection cylinder, all mounted on the first frame. The extrusion die has an extrusion cavity, and the first thrust cylinder and the ejection cylinder are located on the same side of the extrusion cavity.

[0009] The second extruder includes a fixed second frame, a second idler roller, a support clamp, and a second thrust cylinder, all mounted on the second frame. The second thrust cylinder is located on one side of the support clamp, which has a support hole.

[0010] S2. Insert the tenon core into the male connector section at one end of the main chord, and make the outer end of the tenon core flush with the outer end of the male connector section.

[0011] S3. Insert the male connector pipe section at one end of the main chord into the heating machine, turn on the heating machine, and heat the male connector pipe section to the preset temperature;

[0012] S4. Place the main chord rod on the first roller of the first extruder and activate the first thrust cylinder.

[0013] The first thrust cylinder acts on the extrusion die, pushing the extrusion die toward the male connector pipe section, so that the male connector pipe section of the main chord rod, together with the tenon core rod, is pressed into the extrusion cavity of the extrusion die, so that the male connector pipe section is deformed and pressed on the outer periphery of the tenon core rod. The main chord rod has a tenon section with a reduced outer diameter at the outer end of the male connector pipe section.

[0014] The first thrust cylinder is reset and the ejection cylinder is opened;

[0015] The ejection cylinder acts on the male connector section at the bottom of the extrusion cavity, ejecting the male connector section together with the tenon mandrel from the extrusion cavity;

[0016] S5. Install a tenon sealing sleeve at the end of the piston rod of the second thrust cylinder. The tenon sealing sleeve has a tenon hole and a sealing end plate for sealing the tenon hole. The outer diameter of the tenon sealing sleeve is larger than the inner diameter of the main chord rod.

[0017] S6. Insert the female connector pipe section at one end of the main chord into the heating machine, turn on the heating machine, and heat the female connector pipe section to the preset temperature;

[0018] S7. The main chord rod is clamped in the support hole of the support fixture and placed on the second roller of the second extruder; the second thrust cylinder is activated, and the second thrust cylinder presses the tenon sealing sleeve into the female connector pipe section until the outer end of the tenon sealing sleeve is flush with the outer end of the female connector pipe section, so that the female connector pipe section and the tenon sealing sleeve are interference fit.

[0019] S8. Move the main chord rod to the welding platform, weld and fix the outer port of the tenon sealing sleeve and the outer port of the female connector pipe section, and weld and fix the outer port of the tenon core rod and the outer port of the male connector pipe section.

[0020] Furthermore, the processing technology of the integrated main chord bar with round tenon joint also includes step S9, machining the main chord bar after welding, machining a first pin hole at one end of the main chord bar that radially penetrates the female joint pipe section and the mortise sealing sleeve, and machining a second pin hole at the other end of the main chord bar that radially penetrates the male joint pipe section of the tenon section and the tenon core rod, wherein the diameter of the first pin hole and the diameter of the second pin hole are equal and parallel.

[0021] Furthermore, in step S3, the heating temperature of the male connector pipe section is 900-950℃.

[0022] Furthermore, in step S6, the heating temperature of the female connector pipe section is 380–430°C.

[0023] Furthermore, the first extruder also includes positioning blocks fixed on the first frame, the positioning blocks being distributed on the side of the extrusion die facing away from the first thrust cylinder and the ejection cylinder;

[0024] In step S4, the female connector section of the main chord rod rests against the positioning block.

[0025] Further, in the first extruder, the first idler roller, the extrusion die, the first thrust cylinder, and the ejection cylinder constitute a forming mechanism. There are two forming mechanisms: a primary forming mechanism and a secondary forming mechanism. The extrusion cavity in the secondary forming mechanism is smaller than the extrusion cavity in the primary forming mechanism. Step S4 includes the following steps:

[0026] S41. Place the main chord rod on the first roller of the one-time forming mechanism, open the first thrust cylinder in the one-time forming mechanism, and press the male connector pipe section together with the tenon core into the extrusion cavity of the one-time forming mechanism.

[0027] S42. The first thrust cylinder in the one-time forming mechanism is reset, and the ejector cylinder in the one-time forming mechanism is opened to eject the male connector pipe section, thus completing the first extrusion deformation of the male connector pipe section.

[0028] S43. Place the main chord rod on the first roller of the secondary forming mechanism, open the first thrust cylinder in the secondary forming mechanism, and press the male connector pipe section together with the tenon core into the extrusion cavity of the secondary forming mechanism.

[0029] S44. The first thrust cylinder in the secondary forming mechanism is reset, and the ejector cylinder in the secondary forming mechanism is activated to eject the male connector pipe section, completing the second extrusion deformation of the male connector pipe section.

[0030] Furthermore, an ejector block is fixed to the end of the piston rod of the ejector cylinder, and the ejector block can contact the end face of the male connector pipe section.

[0031] Furthermore, the second extruder also includes a limiting top block fixed on the second frame, the limiting top block being distributed on the other side of the support fixture;

[0032] In step S7, the male connector section of the main chord rod abuts against and is in surface contact with the limiting top block.

[0033] Furthermore, the sealing end plate is welded and fixed to the inner end of the mortise sealing sleeve. The outer end of the outer circumference of the mortise sealing sleeve is provided with a first chamfer, and the inner end of the outer circumference of the sealing end plate is provided with a second chamfer. The chamfer angles of the first chamfer and the second chamfer are both 45°.

[0034] Furthermore, the tenon core includes a first cylindrical segment, a frustum transition segment, and a second cylindrical segment connected in sequence, wherein the outer diameter of the second cylindrical segment is smaller than the outer diameter of the first cylindrical segment;

[0035] After step S4, the male connector pipe section includes a male connector outer diameter unchanged pipe section clamped to the outer circumference of the first cylindrical section, a male connector transition pipe section clamped to the outer circumference of the frustum transition section, and a male connector reduced diameter pipe section clamped to the outer circumference of the second cylindrical section. The male connector reduced diameter pipe section and the second cylindrical section constitute the tenon section.

[0036] Furthermore, the inner end of the outer circumference of the first cylindrical segment is provided with a first rounded corner portion, and the inner wall of the male connector with constant outer diameter is provided with a second rounded corner portion that fits with the first rounded corner portion. The male connector with constant outer diameter has a thickened pipe wall portion at the second rounded corner portion.

[0037] As described above, the processing technology of the integrated main chord bar with round tenon joint of the present invention has the following beneficial effects:

[0038] In this application, the mortise sealing sleeve is press-fitted into the female connector pipe section, eliminating the need for a heat-expanding process on the female connector pipe section. Press-fitting is easy to implement. The tenon mandrel is also press-fitted into the male connector pipe section during thermal extrusion deformation. Finally, welding is used to ensure the structural strength of the female and male connectors, resulting in no gaps between the mortise sealing sleeve and the female connector pipe section, and between the tenon mandrel and the male connector pipe section, truly forming a single unit. Therefore, the integrated main chord of the round tenon joint in this application is easy to manufacture. Attached Figure Description

[0039] Figure 1 This is a structural schematic diagram of the standard section of the crane tower in this application.

[0040] Figure 2 for Figure 1 Top view.

[0041] Figure 3 for Figure 1 A schematic diagram showing the orientation of the first pin hole on the female connector.

[0042] Figure 4 This is a structural schematic diagram of the integrated main chord bar with a dovetail joint in this application.

[0043] Figure 5 This is a schematic diagram of the main chord member in this application.

[0044] Figure 6 for Figure 4 Enlarged view of frame A.

[0045] Figure 7 This is a schematic diagram of the mortise sealing sleeve in this application.

[0046] Figure 8 for Figure 4 Enlarged view of frame B.

[0047] Figure 9 This is a schematic diagram of the tenon core rod in this application.

[0048] Figure 10 This is a diagram showing the state of the male connector section of the integrated main chord of the dovetail joint in this application during heating.

[0049] Figure 11 This is a diagram showing the state of the male connector section of the integrated main chord of the dovetail joint in this application during the first compression deformation.

[0050] Figure 12 This is a diagram showing the state of the male connector section of the integrated main chord of the dovetail joint in this application during the second compression deformation.

[0051] Figure 13 This is a schematic diagram of the structure of the blank after the hot extrusion and compression forming of the male joint pipe section of the integrated main chord rod of the round tenon joint, which has undergone a second extrusion deformation.

[0052] Figure 14 This is a diagram showing the state of the integrated main chord of the dovetail joint in this application during the pressing and sealing of the mortise sleeve.

[0053] Figure 15 This is a schematic diagram of the support fixture in this application.

[0054] Component designation explanation

[0055] 10. Heating Machine

[0056] 20 First Extrusion Press

[0057] 21 First rack

[0058] 22 First idler roller

[0059] 23 Extrusion Die

[0060] 231 Extrusion Cavity

[0061] 24 First Thrust Cylinder

[0062] 25 Ejector cylinder

[0063] 26 One-piece molding mechanism

[0064] 27 Secondary forming mechanism

[0065] 28 positioning blocks

[0066] 29. Top out block

[0067] 210 pressure roller

[0068] 30 Second Extruder

[0069] 31 Second rack

[0070] 32 Second idler roller

[0071] 33 Supporting clamps

[0072] 331 Supporting round hole

[0073] 34 Second Thrust Cylinder

[0074] 35 Limiting top block

[0075] 36 Clamping cylinder

[0076] 40 Main chord main bar

[0077] 41 Female connector pipe section

[0078] 42 Male connector pipe section

[0079] 421 Male connector with unchanged outer diameter pipe section

[0080] 422 Male connector transition pipe section

[0081] 423 Male connector reduced diameter pipe section

[0082] 424 Second rounded corner

[0083] 425 Pipe wall thickening section

[0084] 50 Tenon Sealing Sleeve

[0085] 51 Mortise Hole

[0086] 52 Sealing end plate

[0087] 53 First chamfer

[0088] 54 Second chamfer

[0089] 55 Third chamfer

[0090] 60 Tenon Mandrel

[0091] 61 First cylindrical segment

[0092] 62. Frustum transition section

[0093] 63 Second cylindrical segment

[0094] 64 First rounded corner

[0095] 65. Frustum-shaped cavity

[0096] 70 female connector

[0097] 71 First pin hole

[0098] 80 male connector

[0099] 81 Tenon segment

[0100] 82 Second pin hole

[0101] 90 web bar

[0102] 91 Horizontal web member

[0103] 92 Diagonal web member Detailed Implementation

[0104] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0105] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0106] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0107] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0108] This application provides a processing technology for an integrated main chord bar with a dovetail joint, which is used to manufacture a standard section of a crane tower.

[0109] like Figure 1 and Figure 2As shown, the standard section of the crane tower includes four vertically extending integrated main chord members with round tenon joints, and several web members 90 welded between two adjacent integrated main chord members with round tenon joints. The four integrated main chord members with round tenon joints are distributed at four corners. The web members 90 between two adjacent integrated main chord members with round tenon joints include three horizontal web members 91 arranged from top to bottom, and two inclined web members 92. The two inclined web members 92 are inclined in opposite directions. One inclined web member 92 is arranged between the two upper horizontal web members 91, and the other inclined web member 92 is arranged between the two lower horizontal web members 91. Each integrated main chord member with round tenon joints has a female joint 70 and a male joint 80 at its upper and lower ends, respectively. It can be that the upper end is the female joint 70 and the lower end is the male joint 80, or vice versa. In this embodiment, the upper end of the integrated main chord member with round tenon joints is the female joint 70 and the lower end is the male joint 80. Thus, when connecting the upper and lower standard sections of the crane tower body, the male connector 80 at the lower end of the upper standard section of the crane tower body is inserted into the female connector 70 of the lower standard section of the crane tower body, which facilitates the accurate positioning, connection and fixation of the standard sections of the crane tower body. The operation is very convenient, saving time and effort.

[0110] Before machining the integrated main chord with a round tenon joint, it is necessary to prepare the main chord 40, the mortise sealing sleeve 50, and the tenon core 60. For example... Figure 5 As shown, the main chord member 40 is a circular tube structure. The upper and lower parts of the main chord member 40 are respectively the female connector section 41 and the male connector section 42, which are also circular tube structures. Figure 6 As shown, the mortise sealing sleeve 50 is a circular tube structure with an inner hole of mortise hole 51, and the mortise sealing sleeve 50 has a sealing end plate 52 for sealing the mortise hole 51. Figure 7 As shown, the lower part of the tenon core 60 is a cylindrical part with an outer diameter smaller than the inner diameter of the main chord rod 40.

[0111] The processing technology of the integrated main chord with a dovetail joint involved in this application includes the following steps:

[0112] Step S1: Configure the hot extrusion apparatus, which includes a heating machine 10, a first extruder 20, and a second extruder 30. For example... Figure 11 and Figure 12As shown, the first extruder 20 includes a fixed first frame 21, and two first rollers 22, an extrusion die 23, a first thrust cylinder 24, an ejector cylinder 25, and a positioning block 28, all mounted on the first frame 21. The first rollers 22 are perpendicular to the main chord rod 40, and are arranged horizontally along the length of the main chord rod 40 when it is laid flat on the first extruder 20. The extrusion die 23 has an extrusion cavity 231. The ejector cylinder 25 is mounted to the right of the first thrust cylinder 24, and both the first thrust cylinder 24 and the ejector cylinder 25 are located on the right side of the extrusion cavity 231. The positioning block 28 is fixed to the first frame 21 and is located on the left side of the extrusion cavity 231. The piston rod of the first thrust cylinder 24 is connected to the extrusion die 23, pushing the extrusion die 23 to move left and right. The left end of the piston rod of the ejector cylinder 25 is movably positioned in the extrusion cavity 231. Figure 14 As shown, the second extruder 30 includes a fixedly mounted second frame 31, and second idler rollers 32, a support clamp 33, and a second thrust cylinder 34 all mounted on the second frame 31; the second idler rollers 32 are perpendicular to the main chord rod 40, and are distributed on the right side of the support clamp 33; the second thrust cylinders 34 are distributed on the left side of the support clamp 33; as shown... Figure 15 As shown, the support clamp 33 includes two semi-circular arc clamps arranged vertically opposite each other and a clamping cylinder 36. The inner cavities of the two semi-circular arc clamps form support circular holes 331, the diameter of which is equal to the outer diameter of the main chord rod 40. The piston rod of the clamping cylinder 36 is connected to the upper semi-circular arc clamp, driving the upper semi-circular arc clamp to move up and down, causing the support clamp 33 to loosen or lock the main chord rod 40. The first thrust cylinder 24, the ejection cylinder 25, the second thrust cylinder 34, and the clamping cylinder 36 are all connected to the hydraulic system.

[0113] First, perform hot extrusion forming of the male connector 80 at one end of the integrated main chord with a round tenon joint, specifically as described in steps S2 to S4 below.

[0114] Step S2, as follows Figure 10 As shown, the tenon core 60 is inserted into the male connector section 42 at one end of the main chord 40, and the outer end of the small diameter part of the tenon core 60 is basically flush with the outer end of the male connector section 42.

[0115] Step S3: Place the main chord rod 40 horizontally, insert the male connector section 42 at the right end of the main chord rod 40 into the heating machine 10, turn on the heating machine 10, and heat the male connector section 42 to the preset temperature; in this embodiment, the heating temperature of the male connector section 42 is 900~950℃.

[0116] Step S4, as follows Figure 11 and Figure 12As shown, the heated main chord rod 40 is placed horizontally on the first roller 22 of the first extrusion press 20. The female connector section 41 of the main chord rod 40 rests against the right end face of the positioning block 28. The first thrust cylinder 24 is activated. The piston rod of the first thrust cylinder 24 extends to the left, pushing the extrusion die 23 to the left. After the extrusion die 23 contacts the male connector section 42 of the main chord rod 40, it continues to move forward to the left, thereby pressing the male connector section 42 of the main chord rod 40 together with the tenon core 60 into the extrusion cavity 231 of the extrusion die 23. This causes the male connector section 42 to deform and tightly clamp the... The tenon core 60 is pressed around the outer periphery, thus forming a tenon section 81 with a reduced outer diameter at the outer end of the male connector section 42 of the main chord rod 40. Then, the first thrust cylinder 24 is reset, and the ejection cylinder 25 is opened simultaneously. The piston rod of the ejection cylinder 25 extends to the left and enters the extrusion cavity 231, abutting against the male connector section 42 at the bottom of the extrusion cavity 231. The rightward reset stroke of the first thrust cylinder 24 is equal to the leftward extension stroke of the ejection cylinder 25, keeping the main chord rod 40 from displacement, and ejecting the male connector section 42 together with the tenon core 60 from the extrusion cavity 231.

[0117] Preferably, the male connector pipe section 42 is extruded and formed in two processes. Based on this, in the first extruder 20, the first support roller 22, the extrusion die 23, the first thrust cylinder 24, the ejection cylinder 25 and the positioning block 28 constitute the forming mechanism. There are two forming mechanisms, namely a primary forming mechanism 26 and a secondary forming mechanism 27. The deformation length of the extrusion cavity 231 in the secondary forming mechanism 27 is greater than that of the extrusion cavity 231 in the primary forming mechanism 26.

[0118] Step S4 includes the following sub-steps:

[0119] Step S41, as follows Figure 11 As shown, the heated main chord rod 40 is placed horizontally on the first roller 22 of the one-time forming mechanism 26, the first thrust cylinder 24 in the one-time forming mechanism 26 is turned on, and the extrusion mold 23 of the one-time forming mechanism 26 is pushed to the left, which in turn presses the male connector pipe section 42 together with the tenon core rod 60 into the extrusion cavity 231 of the one-time forming mechanism 26, so that the male connector pipe section 42 is deformed by extrusion for the first time.

[0120] Step S42: When the bottom of the extrusion cavity 231 of the one-time forming mechanism 26 contacts the right end of the male connector pipe section 42, the ejection cylinder 25 in the one-time forming mechanism 26 is opened, the piston rod of the ejection cylinder 25 moves to the left and forward, and at the same time the first thrust cylinder 24 in the one-time forming mechanism 26 is reset, driving the extrusion mold 23 to move to the right, thereby ejecting the semi-finished product of the male connector pipe section 42, thus completing the first extrusion deformation of the male connector pipe section 42.

[0121] Step S43: Quickly place the main chord rod 40 of the male connector pipe section 42 after the first extrusion deformation on the first roller 22 of the secondary forming mechanism 27, open the first thrust cylinder 24 in the secondary forming mechanism 27, and push the extrusion mold 23 of the secondary forming mechanism 27 to the left. This will press the male connector pipe section 42 together with the tenon core rod 60 into the extrusion cavity 231 of the secondary forming mechanism 27, so that the male connector pipe section 42 is extruded and deformed for the second time, that is, the male connector pipe section 42 is finally extruded and formed.

[0122] Step S44: When the bottom of the extrusion cavity 231 of the secondary forming mechanism 27 contacts the right end of the male connector pipe section 42, the ejector cylinder 25 in the secondary forming mechanism 27 is activated. The piston rod of the ejector cylinder 25 moves forward to the left, and at the same time, the first thrust cylinder 24 in the secondary forming mechanism 27 is reset, driving the extrusion mold 23 to move to the right, thereby relatively ejecting the final extruded product of the male connector pipe section 42, thus completing the second extrusion deformation of the male connector pipe section 42. At this time, as... Figure 13 As shown, the inner wall of the male connector section 42 is pressed tightly against the outer circumferential surface of the tenon core 60 without any gaps. After cooling, the two become truly physically integrated.

[0123] At this point, the hot extrusion forming of the male connector 80 at one end of the integrated main chord with the dovetail joint is completed. Next, the hot extrusion forming of the female connector 70 at the other end of the integrated main chord with the dovetail joint is performed, specifically through steps S5 to S7 below.

[0124] Step S5, as follows Figure 14 As shown, a tenon sealing sleeve 50 is installed at the right end of the piston rod of the second thrust cylinder 34. The tenon sealing sleeve 50 has a tenon hole 51 inside and a sealing end plate 52 for sealing the tenon hole 51 at the right end. The outer diameter of the tenon sealing sleeve 50 is 2mm larger than the inner diameter of the female connector pipe section 41.

[0125] Step S6: Insert the female connector pipe section 41 at one end of the main chord rod 40 into the heating machine 10. The main chord rod 40 must be the main chord rod 40 that has been extruded and formed by the male connector pipe section 42. Turn on the heating machine 10 and heat the female connector pipe section 41 to the preset temperature. In this embodiment, the heating temperature of the female connector pipe section 41 is 380-430℃, preferably around 400℃. The heating machine 10 used is preferably a medium-frequency heater.

[0126] Step S7, as follows Figure 14As shown, the female connector section 41 of the main chord rod 40 is clamped in the support hole 331 of the support fixture 33. The main chord rod 40 is clamped by the action of the clamping cylinder 36, and the main chord rod 40 is placed horizontally on the second roller 32 of the second extruder 30. The second thrust cylinder 34 is activated, and the piston rod of the second thrust cylinder 34 extends to the right. The second thrust cylinder 34 presses the tenon sealing sleeve 50 into the female connector section 41 to the right until the outer end of the tenon sealing sleeve 50 is flush with the outer end of the female connector section 41, so that the female connector section 41 and the tenon sealing sleeve 50 have an interference fit, and it is an ultra-large interference fit. In this embodiment, the interference amount is 2mm. In addition, due to the clamping action of the support fixture 33, the outer diameter of the female connector section 41 can be kept unchanged.

[0127] Step S8: Move the main chord rod 40 to the welding platform. Use a welding robot to weld and fix the outer port of the mortise sealing sleeve 50 and the outer port of the female connector section 41, and weld and fix the outer port of the tenon core rod 60 and the outer port of the male connector section 42. The mortise sealing sleeve 50 and the female connector section 41 are integrally formed into the female connector 70 at one end of the main chord rod 40 by interference fit and port welding. The tenon core rod 60 and the male connector section 42 are integrally formed into the male connector 80 at the other end of the main chord rod 40 by extrusion deformation, compression and port welding.

[0128] Step S9: Machining all dimensions of the welded main chord rod 40 using a CNC machine tool, including machining the first pin hole 71 of the radially penetrating female connector section 41 and the mortise sealing sleeve 50 at one end of the main chord rod 40, and machining the second pin hole 82 of the radially penetrating male connector section 42 of the tenon section 81 and the tenon core 60 at the other end of the main chord rod 40. The diameter of the first pin hole 71 and the diameter of the second pin hole 82 are equal and parallel. It also includes finishing the inner hole and the guide bevel angle and the port plane of the female connector 70, and controlling the overall length of the main chord rod 40, the coaxiality of the tenon section 81 and the main chord rod 40, and the perpendicularity of the shoulder end face of the male connector 80 to the axis of the main chord rod 40.

[0129] Therefore, the structure of the integrated main chord bar with round tenon joint produced by the above processing technology is as follows: Figure 4 ,as well as Figures 6 to 9As shown, the integrated main chord of the round tenon joint includes a main chord rod 40, a mortise sealing sleeve 50, and a tenon core 60. The two ends of the main chord rod 40 are an integrally axially extending female joint pipe section 41 and a male joint pipe section 42, respectively. The mortise sealing sleeve 50 is press-fitted into the female joint pipe section 41 with an interference fit, and the outer end of the mortise sealing sleeve 50 is welded to the outer end of the female joint pipe section 41. After the mortise sealing sleeve 50 and the female joint pipe section 41 are fixed, they form an integrated female joint 70. The inner hole of the mortise sealing sleeve 50 is a mortise hole. 51. The inner end of the mortise sealing sleeve 50 is welded with a sealing end plate 52 to seal the mortise hole 51; the male connector section 42 is extruded and deformed and pressed onto the outside of the tenon core rod 60, and the outer port of the tenon core rod 60 and the outer port of the male connector section 42 are welded and fixed. The tenon core rod 60 seals the inner hole of the male connector section 42, and the two are fixed to form an integrated male connector 80; the lower part of the male connector 80 is a tenon section 81 that can be inserted and fitted with the mortise hole 51, and the outer diameter of the tenon section 81 and the diameter of the mortise hole 51 are in a clearance fit assembly relationship. Meanwhile, the female connector 70 is provided with a first pin hole 71 that radially penetrates the female connector pipe section 41 and the mortise sealing sleeve 50, and the tenon section 81 of the male connector 80 is provided with a second pin hole 82 that radially penetrates the male connector pipe section 42 and the tenon core 60. Both the first pin hole 71 and the second pin hole 82 are perpendicular to the axis of the main chord 40, and the diameters of the first pin hole 71 and the second pin hole 82 are equal and parallel. After the upper and lower crane tower standard sections are spliced, the second pin hole 82 of the upper crane tower standard section is aligned with the first pin hole 71 of the lower crane tower standard section, and a pin is inserted into the first pin hole 71 and the second pin hole 82 to lock them in place.

[0130] In this application, the mortise sealing sleeve 50 is press-fitted into the female connector pipe section 41, eliminating the need for heat expansion of the female connector pipe section 41. Press-fitting is easily achieved, and finally, welding is used to ensure the structural strength of the female connector 70 and male connector 80, resulting in no gaps between the mortise sealing sleeve 50 and the female connector pipe section 41, and between the tenon core rod 60 and the male connector pipe section 42, truly becoming a single unit. Therefore, the integrated main chord of the round tenon joint in this application is easy to manufacture. The upper end of the inner hole of the integrated main chord of the round tenon joint is sealed by the sealing end plate 52, and the lower section is sealed by the tenon core rod 60, preventing water and air penetration; the sealing end plate 52 is preferably a steel plate. Furthermore, the mortise sealing sleeve 50 and the female connector pipe section 41 are integrated through heat fitting with a large interference fit and then welded at the ends, making the wall thickness of the female connector 70 greater than the wall thickness of the main chord rod 40, ensuring that the cross-sectional performance parameters of the female connector 70 are not lower than those of the main chord rod 40. After thermal deformation, the male connector section 42 is pressed tightly against the outer periphery of the tenon core rod 60 without gaps, and then the ends are welded together to form a whole. This makes the wall thickness of the male connector 80 greater than the wall thickness of the main chord rod 40. Although the outer diameter of the tenon section 81 is smaller than the outer diameter of the main chord rod 40, the presence of the tenon core rod 60 inside ensures that the cross-sectional performance parameters of the male connector 80 are not lower than those of the main chord rod 40.

[0131] Furthermore, such as Figure 3 As shown, in each standard section of the crane tower, the first pin holes 71 of the four integrated main chords with round tenon joints are parallel to each other, and the first pin holes 71 of the two integrated main chords with round tenon joints are perpendicular to each other, thus optimizing the stress on the standard section of the crane tower.

[0132] Furthermore, such as Figure 4 ,as well as Figures 6 to 9 As shown, the outer diameter of the female connector section 41 is equal to that of the main chord member 40. Figure 5 As shown, both ends of the inner hole of the main chord 40 are machined with 5×45° chamfers to facilitate inserting the tenon core 60 into the male connector pipe section 42 and to facilitate pressing the mortise sealing sleeve 50 into the female connector pipe section 41.

[0133] Furthermore, such as Figure 6 and Figure 7 As shown, the outer end of the mortise sealing sleeve 50 is provided with a first chamfer 53 of 5×45°, the inner end of the outer circumference of the sealing end plate 52 is provided with a second chamfer 54 of 5×45°, and the outer end of the inner hole of the mortise sealing sleeve 50 is provided with a third chamfer 55 of 8×45°. The second chamfer 54 facilitates the pressing of the mortise sealing sleeve 50 into the female connector pipe section 41, and the first chamfer 53 serves as the welding bevel with the main chord main rod 40 pipe blank.

[0134] Furthermore, such as Figure 8 and Figure 9 As shown, the tenon core 60 includes a first cylindrical section 61, a frustum transition section 62, and a second cylindrical section 63 connected sequentially from the inside to the outside. The outer diameter of the first cylindrical section 61 is equal to the inner diameter of the tube blank of the main chord 40, and the outer diameter of the second cylindrical section 63 is smaller than the outer diameter of the first cylindrical section 61. The second cylindrical section 63 is a solid structure. After step S4, the extruded male connector section 42 includes a male connector outer diameter unchanged section 421 clamped around the outer circumference of the first cylindrical section 61, a male connector transition section 422 clamped around the outer circumference of the frustum transition section 62, and a male connector reduced diameter section 423 clamped around the outer circumference of the second cylindrical section 63. The male connector reduced diameter section 423 and the second cylindrical section 63 constitute the tenon section 81. The male connector 80 has a shoulder formed at the junction of the male connector transition section 422 and the male connector reduced diameter section 423. Preferably, the inner end of the outer circumference of the first cylindrical section 61 is provided with a first rounded corner portion 64, and the inner wall of the male connector non-circular diameter pipe section 421 is provided with a second rounded corner portion 424 that fits against the first rounded corner portion 64. Thus, the male connector non-circular diameter pipe section 421 forms a pipe wall thickening portion 425 at the second rounded corner portion 424. Figure 13 As shown, the pipe wall of the male connector section 421 with a constant outer diameter is slightly thickened at the second rounded corner 424, so that the tenon core 60 has no room for movement along the axial direction of the main chord 40, truly becoming a single unit. Preferably, the tenon core 60 has a frustum cavity 65 opened in the first cylindrical section 61 and the frustum transition section 62, which can save materials and reduce costs while ensuring strength.

[0135] Furthermore, such as Figure 11 and Figure 12 As shown, the first thrust cylinder 24 is a through-hole composite cylinder. The left end of the piston rod of the first thrust cylinder 24 is directly connected to the extrusion die 23. The first thrust cylinder 24 pushes the extrusion die 23 to the left towards the male connector pipe section 42, and extrudes and shapes the male connector pipe section 42 through the extrusion cavity 231. The piston rod of the ejector cylinder 25 passes through the first thrust cylinder 24 and extends into the extrusion cavity 231. An ejector block 29 is fixed to the left end of the piston rod of the ejector cylinder 25. The ejector block 29 can contact the end face of the male connector pipe section 42. The ejector block 29 is movably mounted in the extrusion cavity 231, and the ejector cylinder 25 acts on the male connector pipe section 42 through the ejector block 29. The first extruder 20 is also equipped with a pressure roller 210, which is arranged vertically opposite to the first support roller 22. In addition, the first extruder 20 is positioned on the left end of the female connector pipe section 41 by the positioning block 28, which can play a better role in positioning and preventing the main chord rod 40 from moving backward under force, thus more reliably ensuring the accuracy of the relative displacement between the male connector pipe section 42 and the extrusion die 23, and thus ensuring the extrusion forming accuracy of the male connector pipe section 42.

[0136] Furthermore, such as Figure 14As shown, the second extruder 30 also includes a limiting top block 35 fixed on the second frame 31. The limiting top block 35 is distributed on the right side of the support clamp 33. In the above step S7, the male connector pipe section 42 of the main chord rod 40 abuts against and is in surface contact with the limiting top block 35, which restricts the rightward movement of the main chord rod 40 and more reliably presses the tenon sealing sleeve 50 into the female connector pipe section 41 to the right.

[0137] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0138] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A processing technology for an integrated main chord with a round tenon joint, characterized in that: The steps are as follows: S1. Configure a hot extrusion device, which includes a heating machine (10), a first extruder (20), and a second extruder (30). The first extruder (20) includes a fixed first frame (21), a first roller (22) mounted on the first frame (21), an extrusion die (23), a first thrust cylinder (24) and an ejector cylinder (25). The extrusion die (23) has an extrusion cavity (231) inside. The first thrust cylinder (24) and the ejector cylinder (25) are distributed on the same side of the extrusion cavity (231). The second extruder (30) includes a fixed second frame (31), a second idler roller (32), a support clamp (33), and a second thrust cylinder (34) all mounted on the second frame (31). The second thrust cylinder (34) is distributed on one side of the support clamp (33), and the support clamp (33) is provided with a support circular hole (331). S2. Insert the tenon core (60) into the male connector section (42) at one end of the main chord (40), and make the outer end of the tenon core (60) flush with the outer end of the male connector section (42); S3. Insert the male connector section (42) at one end of the main chord (40) into the heating machine (10), turn on the heating machine (10), and heat the male connector section (42) to the preset temperature; S4. Place the main chord rod (40) on the first roller (22) of the first extruder (20) and turn on the first thrust cylinder (24). The first thrust cylinder (24) acts on the extrusion mold (23) to push the extrusion mold (23) toward the male connector pipe section (42), so that the male connector pipe section (42) of the main chord rod (40) together with the tenon core rod (60) is pressed into the extrusion cavity (231) of the extrusion mold (23), so that the male connector pipe section (42) is deformed and pressed on the outer periphery of the tenon core rod (60). The main chord rod (40) has a tenon section (81) with a reduced outer diameter at the outer end of the male connector pipe section (42). The first thrust cylinder (24) is reset and the ejection cylinder (25) is opened. The ejection cylinder (25) acts on the male connector section (42) at the bottom of the extrusion cavity (231) to eject the male connector section (42) together with the tenon core (60) from the extrusion cavity (231); S5. Install a tenon sealing sleeve (50) at the end of the piston rod of the second thrust cylinder (34). The tenon sealing sleeve (50) has a tenon hole (51) and a sealing end plate (52) for sealing the tenon hole (51). The outer diameter of the tenon sealing sleeve (50) is larger than the inner diameter of the main chord rod (40). S6. Insert the female connector pipe section (41) at one end of the main chord (40) into the heating machine (10), turn on the heating machine (10), and heat the female connector pipe section (41) to the preset temperature; S7. The main chord rod (40) is clamped in the support hole (331) of the support fixture (33) and placed on the second roller (32) of the second extruder (30); the second thrust cylinder (34) is turned on, and the second thrust cylinder (34) presses the tenon sealing sleeve (50) into the female connector pipe section (41) until the outer end of the tenon sealing sleeve (50) is flush with the outer end of the female connector pipe section (41), so that the female connector pipe section (41) and the tenon sealing sleeve (50) are interference fit; S8. Move the main chord rod (40) to the welding platform, weld and fix the outer port of the tenon sealing sleeve (50) and the outer port of the female connector pipe section (41), and weld and fix the outer port of the tenon core rod (60) and the outer port of the male connector pipe section (42).

2. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: It also includes step S9, machining and welding the main chord rod (40), machining a first pin hole (71) for a radially penetrating female connector pipe section (41) and a mortise sealing sleeve (50) at one end of the main chord rod (40), and machining a second pin hole (82) for a radially penetrating male connector pipe section (42) for a tenon section (81) and a tenon core rod (60) at the other end of the main chord rod (40), wherein the diameter of the first pin hole (71) and the diameter of the second pin hole (82) are equal and parallel.

3. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: In step S3, the heating temperature of the male connector pipe section (42) is 900-950℃.

4. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: In step S6, the heating temperature of the female connector pipe section (41) is 380-430℃.

5. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: The first extruder (20) further includes a positioning block (28) fixed on the first frame (21), the positioning block (28) being distributed on the side of the extrusion die (23) facing away from the first thrust cylinder (24) and the ejection cylinder (25); In step S4, the female connector section (41) of the main chord rod (40) rests on the positioning block (28).

6. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: In the first extruder (20), the first idler roller (22), the extrusion die (23), the first thrust cylinder (24), and the ejection cylinder (25) constitute a forming mechanism. The forming mechanism has two sets, namely a primary forming mechanism (26) and a secondary forming mechanism (27). The extrusion cavity (231) in the secondary forming mechanism (27) is smaller than the extrusion cavity (231) in the primary forming mechanism (26). Step S4 includes the following steps: S41. Place the main chord rod (40) on the first roller (22) of the one-time forming mechanism (26), open the first thrust cylinder (24) in the one-time forming mechanism (26), and press the male connector pipe section (42) together with the tenon core rod (60) into the extrusion cavity (231) of the one-time forming mechanism (26); S42, the first thrust cylinder (24) in the one-time forming mechanism (26) is reset, and the ejection cylinder (25) in the one-time forming mechanism (26) is opened to eject the male connector pipe section (42) and complete the first extrusion deformation of the male connector pipe section (42); S43. Place the main chord rod (40) on the first roller (22) of the secondary forming mechanism (27), open the first thrust cylinder (24) in the secondary forming mechanism (27), and press the male connector pipe section (42) together with the tenon core rod (60) into the extrusion cavity (231) of the secondary forming mechanism (27); S44. The first thrust cylinder (24) in the secondary forming mechanism (27) is reset, and the ejection cylinder (25) in the secondary forming mechanism (27) is opened to eject the male connector pipe section (42) and complete the second extrusion deformation of the male connector pipe section (42).

7. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: The piston rod of the ejector cylinder (25) is fixed with an ejector block (29), which can contact the end face of the male connector pipe section (42).

8. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: The second extruder (30) also includes a limiting top block (35) fixed on the second frame (31), the limiting top block (35) being distributed on the other side of the support clamp (33); In step S7, the male connector section (42) of the main chord rod (40) abuts against and is in surface contact with the limiting top block (35).

9. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: The sealing end plate (52) is welded and fixed to the inner end of the mortise sealing sleeve (50). The outer end of the outer circumference of the mortise sealing sleeve (50) is provided with a first chamfer (53), and the inner end of the outer circumference of the sealing end plate (52) is provided with a second chamfer (54). The chamfer angles of the first chamfer (53) and the second chamfer (54) are both 45°.

10. The processing technology of the integrated main chord with a round tenon joint according to claim 1, characterized in that: The tenon core (60) includes a first cylindrical section (61), a frustum transition section (62), and a second cylindrical section (63) connected in sequence, wherein the outer diameter of the second cylindrical section (63) is smaller than the outer diameter of the first cylindrical section (61); After step S4, the male connector pipe section (42) includes a male connector outer diameter unchanged pipe section (421) clamped around the outer periphery of the first cylindrical section (61), a male connector transition pipe section (422) clamped around the outer periphery of the frustum transition section (62), and a male connector reduced diameter pipe section (423) clamped around the outer periphery of the second cylindrical section (63). The male connector reduced diameter pipe section (423) and the second cylindrical section (63) constitute the tenon section (81).

11. The processing technology of the integrated main chord with a round tenon joint according to claim 10, characterized in that: The inner end of the outer circumference of the first cylindrical section (61) is provided with a first rounded corner (64), and the inner wall of the male connector non-circular diameter pipe section (421) is provided with a second rounded corner (424) that fits with the first rounded corner (64). The male connector non-circular diameter pipe section (421) has a pipe wall thickening part (425) at the second rounded corner (424).

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