Chain drive system, double swing lever power distribution mechanism and truss welding bending mechanism

Abstract

The present application relates to chain transmission system, double swing rod power distribution mechanism and truss welding bending mechanism, including frame, the frame is supported in the upper and lower direction corresponding upper chain transmission system, lower chain transmission system, the driving sprocket of each chain transmission system is driven sprocket through the closed transmission chain transmission connection corresponding, the outside of transmission chain is fixedly connected with traction pin, the bottom of frame is provided with transmission shaft of transmission connection power device, the extension end of transmission shaft passes through the driving sprocket of two chain transmission systems in turn and is fixed with the driving sprocket circumferentially, the frame is supported in the upper and lower direction corresponding upper swing arm transmission shaft, the front extension end of two swing arm transmission shaft is fixed with adjusting swing arm, the free end of adjusting swing arm is provided with bending pin, the rear extension end of lower swing arm transmission shaft is connected with lower swing arm power rod, the rear extension end of upper swing arm transmission shaft is connected with upper swing arm power rod, the frame is provided with swing arm intermediate seat.

Description

Technical Field

[0001] The invention relates to a forming device, in particular to a chain transmission system, a double-rocker power distribution mechanism and a truss welding and bending mechanism. Background Art

[0002] With the development of the domestic steel structure construction industry and the continuous improvement of production efficiency, the traditional manual tying of steel bars in concrete floor slabs has become outdated. The production model relying on manual assembly and welding is no longer able to meet demand due to its high labor intensity, low production efficiency, and inconsistent quality. In the factory, a set of steel bars is processed into steel trusses through an automated process including straightening, bending, conveying, and welding. Steel truss welding production lines are used to factory-produce steel trusses for construction. After being welded to the steel floor slab, concrete can be poured directly on top without supporting columns. These trusses offer advantages such as high efficiency, short construction cycles, and excellent rigidity, and are now increasingly widely used in the construction industry. Existing first- and second-generation corrugated steel plate rebar tying methods are cumbersome, and the spacing between rebars and the thickness of the concrete cover are difficult to control. Therefore, it is necessary to design a new and efficient web bending mechanism for steel truss welding production lines. Currently, triangular beam truss production lines used in construction and other industries require bending metal wire into web bars of varying sizes, most of which are corrugated in shape. In existing triangular beam truss production lines, there are three types of equipment for bending web bars into a corrugated shape: disc-type bending machines, crawler-chain bending machines, and pneumatic four-link bending machines. These machines suffer from the following drawbacks: low production efficiency and unstable operation. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the existing technology and provide a chain transmission system, a double rocker power distribution mechanism and a truss welding and bending mechanism, which can bend the web reinforcement while ensuring the synchronization of the various movements of the entire device.

[0004] The object of the present invention is achieved as follows: a chain transmission system includes a chain and a sprocket, the transmission chain includes a plurality of main chain plates arranged in an annular manner, three cocircular meshing teeth are provided on the main chain plates, and the meshing teeth located at both ends of the main chain plates are provided with end opening grooves, and the two adjacent main chain plates are connected by outer chain plates, and the two ends of the outer chain plates respectively extend into the adjacent end opening grooves and are hinged to the end opening grooves; the outer circumference of the sprocket is provided with an annular groove for making way for the outer chain plates, and upper meshing flange portions and lower meshing flange portions are respectively provided on both sides of the annular groove, and meshing teeth and tooth grooves are alternately provided on the outer circumferences of the upper meshing flange portion and the lower meshing flange portion.

[0005] Through holes are provided at both ends of the outer link plate for the pin shaft to pass through, and the side walls of the through holes are provided with limit pin holes that cooperate with the limit pins. The inner extension section of the limit pin extends into the recessed portion on the pin shaft, and the two ends of the pin shaft respectively extend into the mounting holes on the inner wall of the end opening groove.

[0006] The cam is connected to the lower frame via a second rotation of the linkage, and the cam is connected to the transmission gear of the lower frame via a third rotation of the linkage, and the cam is connected to the transmission gear of the lower frame via a third rotation of the linkage, and the cam is connected to the transmission gear of the lower frame via a third rotation of the linkage. The rotating pair is hinged to one end of the upper inner swing arm relay rod, and the other end of the upper inner swing arm relay rod is hinged to one end of the upper swing arm transmission rod through the fourth rotating pair. One end of the outer swing arm middle rod is hinged to one end of the lower outer swing arm relay rod through the fifth rotating pair. The other end of the lower outer swing arm relay rod is hinged to the other radially extending end of the lower swing arm power rod through the sixth rotating pair. The other end of the outer swing arm middle rod is hinged to one end of the upper outer swing arm relay rod through the seventh rotating pair. The other end of the upper outer swing arm relay rod is hinged to the other end of the upper swing arm transmission rod through the eighth rotating pair. The lower swing arm power rod is connected to the power device for transmission. The power device applies power to make the lower swing arm power rod swing back and forth around the lower swing arm transmission shaft.

[0007] The frame is provided with a swing arm intermediate seat which can slide along the direction of the line connecting the upper swing arm transmission shaft and the lower swing arm transmission shaft; the frame supports the upper swing arm transmission shaft which can move relative to the lower swing arm transmission shaft.

[0008] The back of the frame is fixedly connected to the transmission mechanism mounting frame, and the transmission frame is mounted with a long strip hole whose long axis extends in the vertical direction, and the swing arm middle seat passes through the long strip hole, and the circumference of the swing arm middle seat is limited circumferentially with the long strip hole, and the swing arm middle seat slides with the long strip hole in the long axis direction of the strip hole, and the two axial ends of the swing arm middle seat respectively extending out of the first through hole are respectively hinged to the staggered inner swing arm middle rod and the outer swing arm middle rod, and the rear extending end of the lower swing arm transmission shaft extending out of the long strip hole is connected to the lower swing arm power rod, and the rear extending end of the upper swing arm transmission shaft extending out of the long strip hole is connected to the upper swing arm power rod.

[0009] The cam is connected to the transmission gear of the present invention through the transmission gear of the upper and lower ends of the transmission gear of the upper and lower ends of the transmission gear of the upper and lower ends of the transmission gear of the lower ends of the transmission gear.

[0010] A lifting main base plate that slides up and down is set on the frame, the upper chain transmission system is supported on the lower end surface of the lifting main base plate, the lower swing arm transmission shaft is supported on the upper end surface of the lifting main base plate, and the arm body length of the adjustment swing arm is adjustable.

[0011] The power device includes a first reducer, the input end of the first reducer is fixedly connected to the output end of the motor, one of the output shafts of the first reducer is fixedly connected to a main motor flywheel, the eccentric hole provided on the main motor flywheel is hinged to one end of the swing arm connecting rod, and the other end of the swing arm connecting rod is hinged to the free end of the rocker arm section provided on the lower swing arm power rod.

[0012] A rear vertical plate fixed in axial position relative to the sprocket is provided between the driving wheel and the driven sprocket of the chain transmission system, and the rear vertical plate faces the tight side of the transmission chain, and the upper vertical plate faces the tight side of the transmission chain and is provided with a sliding groove for accommodating the tight side of the transmission chain.

[0013] The transmission chain includes a plurality of main chain plates arranged in a ring, and three cocircular meshing teeth are provided on the main chain plates. The meshing teeth located at both ends of the main chain plates are provided with end opening grooves. The two adjacent main chain plates are connected by outer chain plates, and the two ends of the outer chain plates respectively extend into the adjacent end opening grooves and are hinged to the end opening grooves; the outer circumference of the sprocket is provided with an annular groove for making way for the outer chain plates, and an upper meshing flange portion and a lower meshing flange are respectively provided on both sides of the annular groove, and meshing teeth and tooth grooves are alternately provided on the outer circumferences of the upper meshing flange portion and the lower meshing flange portion.

[0014] The above scheme has the following beneficial effects: the two axial ends of the swing arm middle seat are respectively hinged to the staggered inner swing arm middle rod and the outer swing arm middle rod, and the swing amplitude and the swing rate are synchronized, and then the power transmitted by the rod reaches the upper swing arm transmission rod, and the movement of the upper swing arm transmission rod is synchronized with the movement of the lower swing arm power rod. At the same time, part of the power of the lower swing arm power rod is transmitted to the upper swing arm transmission rod through the lower inner swing arm relay rod, the inner swing arm middle rod, and the upper inner swing arm relay rod. At the same time, part of the power of the lower swing arm power rod is transmitted to the upper swing arm transmission rod through the lower outer swing arm relay, The outer swing arm middle rod and the upper outer swing arm relay rod are transmitted to the upper swing arm transmission rod. In this way, power can be transmitted through two paths. When the power transmission structure of one path approaches the dead point, the other path can continue to transmit power, which can avoid the situation where the entire power transmission mechanism has a dead point in motion. At the same time, the forces at both ends of the inner swing arm middle rod, the outer swing arm middle rod, the upper swing arm transmission rod, and the lower swing arm power rod tend to offset and balance relative to the center position of the rod, which can facilitate the fixation of each rod and improve the reliability of the entire transmission system. The rotation of the transmission shaft causes the upper and lower chain transmission systems to rotate synchronously. The chains of the upper chain transmission system and the lower chain transmission system move in the same direction at the same time. The moving speed is the linear speed of the sprocket teeth. The outer side of the transmission chain is fixedly connected to the traction pin, which plays a supporting and forming role when the web reinforcement is bent. The distance between the two adjacent traction pins of the upper chain transmission system is consistent with the distance between the two adjacent traction pins of the lower chain transmission system. Its length dimension is equal to the web reinforcement node spacing L after the web reinforcement is bent and formed. The traction pins of the upper chain transmission system and the traction pins of the lower chain transmission system are staggered with each other in the horizontal projection position, and the staggered spacing is half of the web reinforcement node spacing L.

[0015] The power distribution mechanism alternately drives the adjustable swing arms into a swinging motion, bending the webs of the bending pins mounted on the arms into a wavy pattern along the traction pins on the upper and lower chain drive systems. The uniform motion of the drive chain, generated by the power unit via a fixed drive shaft, and the rhythmic swinging of the two adjustable swing arms bend the straight webs into wavy webs with a fixed pitch for subsequent truss welding and formation. This solution achieves high synchronization between the two adjustable swing arms, as well as the synchronization of the upper and lower chain drive systems, significantly improving production efficiency while maintaining stable operation.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural diagram of the double rocker power distribution mechanism;

[0019] Figure 3 for Figure 2 Front view of

[0020] Figure 4 It is a structural diagram of the cooperation between the transmission chain and the sprocket;

[0021] Figure 5 Schematic diagram of the installation structure of the first chain pressure plate;

[0022] Figure 6 This is a schematic diagram of the installation structure of the lower rear vertical plate;

[0023] Figure 7 Schematic diagram of the installation structure of the swing arm connecting rod.

[0024] In the accompanying drawings, 9 is an outer chain plate, 10 is a frame, 14 is a transmission shaft, 15 is a transmission chain, 16 is a driving sprocket, 17 is an adjusting swing arm, 18 is a lower swing arm power rod, 19 is an upper swing arm power rod, 20 is a swing arm intermediate seat, 21 is an inner swing arm middle rod, 22 is an outer swing arm middle rod, 24 is an upper swing arm transmission rod, 25 is a lower outer swing arm relay rod, 26 is an upper outer swing arm relay rod, 27 is a main motor flywheel, 28 is a swing arm connecting rod, 29 is a second reducer, 30 is an upper swing arm transmission shaft, 31 is a lower swing arm transmission shaft, 32 is a lifting main base plate, 34 is a second opposite chain pressure strip, 35 is a guide groove, 36 is a traction pin, 37 is a through hole, 38 is a limit pin hole, 39 is a driving wheel, 40 is a driven sprocket, 42 is a slide groove, 43 is a chain main base plate, 45 is the first A chain pressure seat plate, 46 is the first opposing chain pressure strip, 47 is the upper slide bracket seat, 48 is the stripping track, 49 is the second chain pressure seat plate, 50 is the transmission mechanism mounting frame, 51 is a long strip hole, 52 is the first reducer, 151 is the main chain plate, 161 is the bending pin, 181 is the rocker arm segment, 321 is the horizontal plate, 361 is the arc top surface, 481 is the guide cone surface, 001 is the first rotating pair, 002 is the second rotating pair, 003 is the third rotating pair, 004 is the fourth rotating pair, 005 is the fifth rotating pair, 006 is the sixth rotating pair, 007 is the seventh rotating pair, 008 is the eighth rotating pair, 1512 is the end opening groove, 1513 is the pin shaft, 1521 is the annular cut groove, 1522 is the upper meshing flange portion, a is the meshing tooth, and b is the tooth groove. DETAILED DESCRIPTION

[0025] Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] See also Figures 1 to 7, an embodiment of a truss welding and bending mechanism, a truss welding and bending mechanism, including a frame 10 and a double rocker power distribution mechanism, the frame 10 supports the corresponding upper chain transmission system and lower chain transmission system in the upper and lower directions, and the driving wheel 39 of each chain transmission system is connected to the corresponding driven sprocket 40 through a closed transmission chain 15.

[0027] In this embodiment, the transmission chain 15 comprises a plurality of annularly arranged main link plates 151, each provided with three cocircular meshing teeth a. The meshing teeth a at each end of the main link plates 151 are provided with end-opening slots 1512. Adjacent main link plates 151 are connected by outer link plates 9, each end of which extends into and is hingedly connected to the adjacent end-opening slots 1512. The outer circumference of the sprocket is provided with an annular groove 1521 for accommodating the outer link plates. An upper meshing flange 1522 and a lower meshing flange 1523 are provided on either side of the annular groove 1521, respectively. The outer circumferences of the upper and lower meshing flanges 1522 and 1523 are alternately provided with meshing teeth a and tooth slots b. This transmission chain provides high traction and can exert significant traction in both forward and reverse directions during actual production. In this embodiment, through-holes 37 are provided at both ends of the outer link plates 9 for the pins 1513 to pass through. The two ends of the pins 1513 extend into mounting holes in the inner wall of the end opening slots, which extend through the meshing teeth of the main link plates. Limit pin holes 38 are provided on the sidewalls of the through-holes 37, which accommodate limit pins. The inner extension of the limit pins extends into a recessed portion on the pins 1513. The recessed portion can be a blind hole, a through hole, or a ball socket. This structure simplifies the structure of the pins 1513 and prevents axial movement of the pins 1513. A traction pin 36 is fixedly connected to the outer side of the transmission chain 15. The traction pins 36 of the upper and lower chain transmission systems are staggered in horizontal projection. In this embodiment, a traction pin 36 is integrally formed on the outer side of the main chain plate 151 of the transmission chain 15. The traction pin 36 of the transmission chain 15 of the lower chain transmission system has a downwardly facing arc top surface 361, while the traction pin 36 of the transmission chain 15 of the lower chain transmission system has an upwardly facing arc top surface 361. The integrally formed structure effectively simplifies the connection structure of the traction pin 36, eliminating the need for connection structures such as connection holes or grooves, and effectively enhances the structural strength of the main chain plate 151 and the traction pin 36.

[0028] A transmission shaft 14 for connecting the power device is set at the bottom of the frame 10. The transmission shaft 14 includes a spline extension shaft section, a square shaft extension shaft section, or a flat square shaft extension shaft section. Of course, the cross-section of the transmission shaft 14 can also be set to an elliptical, polygonal, or other non-circular extension shaft section for transmitting torque. The extension shaft section of the transmission shaft 14 passes through the driving wheels 39 of the two chain transmission systems in sequence and is circumferentially fixed to the driving wheels 39 for transmitting torque to the driving wheels 39.

[0029] The double rocker arm power distribution mechanism includes a lower rocker arm transmission shaft 31 and an upper rocker arm transmission shaft 30. The frame 10 supports the upper rocker arm transmission shaft 30 and the lower rocker arm transmission shaft 31 corresponding to each other in the vertical direction. The upper rocker arm transmission shaft 30 and the lower rocker arm transmission shaft 31, the front end of the two rocker arm transmission shafts are fixed with an adjustment rocker arm 17, and a bending pin 161 is provided at the free end of the adjustment rocker arm 17; the adjustment rocker arm 17 may include a rocker arm seat for fixing with the rocker arm transmission shaft, the free end of the rocker arm seat is provided with a positioning groove with an adjustable opening width, the positioning groove is fitted with a rocker arm, and the free end of the rocker arm is provided with a bending pin facing the transmission sprocket. The upper rocker arm transmission shaft 30 is located above the driven sprocket 40 of the upper chain transmission system, and the upper rocker arm transmission shaft 30 is located below the driven sprocket 40 of the lower chain transmission system. The rear extension end of the lower swing arm transmission shaft 31 is connected to the lower swing arm power rod 18, and the rear extension end of the upper swing arm transmission shaft 30 is connected to the upper swing arm power rod 19. The frame 10 is provided with a swing arm middle seat 20, and the swing arm middle seat 20 is located between the upper swing arm power rod 19 and the lower swing arm power rod 18. The two axial ends of the swing arm middle seat 20 are respectively hinged to the staggered inner swing arm middle rod 21 and the outer swing arm middle rod 22. One end of the inner swing arm middle rod 21 is hinged to one end of the lower inner swing arm relay rod 231 through the first rotating pair 001, and the other end of the lower inner swing arm relay rod 231 is hinged to a radial extension section of the lower swing arm power rod 18 through the second rotating pair 002. The other end of the inner swing arm middle rod 21 is hinged to one end of the upper inner swing arm relay rod 232 through the third rotating pair 003, and the other end of the upper inner swing arm relay rod 232 is hinged to the fourth rotating pair The rotating pair 004 is hinged to one end of the upper swing arm transmission rod 24, one end of the outer swing arm middle rod 22 is hinged to one end of the lower outer swing arm relay rod 25 through the fifth rotating pair 005, the other end of the lower outer swing arm relay rod 25 is hinged to the other radially extending end of the lower swing arm power rod through the sixth rotating pair 006, the other end of the outer swing arm middle rod 22 is hinged to one end of the upper outer swing arm relay rod 26 through the seventh rotating pair 007, the other end of the upper outer swing arm relay rod 26 is hinged to the other end of the upper swing arm transmission rod 24 through the eighth rotating pair 008, the lower swing arm power rod 18 is transmission connected to the power device, the lower swing arm power rod 18 can be fixedly connected to the driving gear, sprocket, pulley, and then the transmission connection is connected to the power device that provides positive and negative torque, and the power device applies power to make the lower swing arm power rod 18 swing back and forth around the lower swing arm transmission shaft 31. The figure formed by connecting the first rotating pair 001, the second rotating pair 002, the third rotating pair 003, and the fourth rotating pair 004 in the first position is congruent to the figure formed by connecting the fifth rotating pair 005, the sixth rotating pair 006, the seventh rotating pair 007, and the eighth rotating pair 008 in the first and last positions. This structure can ensure the coordination of the two upper swing arm transmission shafts 30 and the lower swing arm transmission shaft 31 and the consistent movement amplitude.Preferably, the side of the lifting main substrate 32 is fixed with a first chain pressure seat plate 45, and the lower extending end of the first chain pressure seat plate 45 is fixed with a first opposing chain pressure strip 46, and the upper opposing chain pressure strip extends parallel to the upper transmission chain on the outer side of the tight side of the upper transmission chain, and a guide groove 35 is left between the first opposing chain pressure strip 46 and the front section of the tight side of the transmission chain to facilitate the passage of the web ribs, and the front section of the first opposing chain is provided with a guide cone surface 481 to transition to the inner side of the opposing chain pressure strip, and a slide bracket seat 47 is provided on the horizontal plate 321 of the lifting main substrate 32, and a stripping track 48 extending along the tight side of the transmission chain is provided on the slide bracket seat 47, and the front section of the stripping track 48 is provided with a cone surface to transition to the outer side of the stripping track 48. A second chain pressure seat plate 49 corresponding to the first chain pressure seat plate 45 is provided on the chain main base plate 43, and the lower extending end of the first chain pressure seat plate 45 is fixed with the second opposing chain pressure bar 34, and the extending direction of the opposing chain pressure bar is consistent with the extending direction of the tight side of the lower transmission chain. A guide groove 35 is left between the second opposing chain pressure bar 34 and the front section of the tight side of the transmission chain to facilitate the passage of the web reinforcement. The width of the guide groove 35 is smaller than the extending width of the bending pin 161. The front section of the first opposing chain is provided with a guide cone surface 481 to transition to the inner side of the opposing chain pressure bar. A slide bracket seat 47 is provided on the chain main base plate 43. The slide bracket seat 47 is provided with a stripping track 48 extending along the tight side of the transmission chain. The front section of the stripping track 48 is provided with a conical surface that transitions with the outer side surface of the stripping track 48. When the chord is mounted on the bending pin 161, the chord can be guided. The chord moves in the guide groove 35 so that the chord is always mounted on the upper bending pin 161, which can reliably pull the chord. At the same time, when the chord moves to the rear section of the tight side, the conical surface of the stripping track 48 is stripped from the chord mounted on the bending pin 161, so that the chord is stripped on the bending pin 161, which facilitates the chord to continue to move along a straight line.

[0030] Furthermore, the frame 10 is provided with a swing arm intermediate seat 20 that can slide along the line connecting the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31; the frame 10 supports the upper swing arm transmission shaft 30 that can move relative to the lower swing arm transmission shaft 31. Specifically, a lifting main base plate 32 that slides up and down is provided on the frame 10, and one side of the lifting main base plate 32 slides with the frame 10 through a slide rail or other sliding matching structure. A chain main base plate 43 is provided on the frame 10, and the upper plate surface of the chain main base plate 43 is used to support the lower chain transmission system. The chain transmission system can be placed on the lower core shaft through a bearing sleeve, and one end of the core shaft is connected and fixed to the plate surface to realize the support of the master and driven sprockets 40; the chain main base plate 43 can be provided with a lifting device, and the lifting end of the lifting device is connected to the lifting main base plate 32. The lifting device can be a jack or a screw lifter. In this embodiment, a screw lifter is provided on the bottom surface of the chain main base plate 43, and the lifting end of the lifter is connected to the lifting main base plate 32. The lifter can facilitate the lifting and lowering of the lifting main base plate 32, and facilitates the adjustment of the position in the up and down directions. The upper chain transmission system is supported on the lower end surface of the lifting main base plate 32, and the chain sprocket can be supported by a core shaft, and one end of the core shaft is connected and fixed to the bearing plate surface to realize the support of the master and driven sprockets 40; the lower swing arm transmission shaft 31 is supported on the upper end surface of the lifting main base plate 32, and the axis center lines of the swing arm middle seat 20, the upper swing arm transmission shaft 30, and the lower swing arm transmission shaft 31 are coplanar. The swing arm middle seat 20 can slide along the direction of the connection line between the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31, and the arm body length of the adjustment swing arm 17 is adjustable. This structure can realize the production of web reinforcement of truss steel bars with different height specifications. When the height of the truss steel bars to be produced is high, by increasing the distance between the upper chain transmission system and the lower chain transmission system, in this embodiment, the lifting is lifted by the spiral lifter The main board of the descender realizes the lifting of the upper chain transmission system, and at the same time adjusts the length of the arm body or replaces the adjustment arm with a longer arm body, so that the entire bending pin 161 can bend the web at the corresponding transmission chain 15 accessory, and the height of the web after bending can be consistent with the height of the adjacent traction pin 36; during the entire adjustment process, no matter how much the height is adjusted, the movement synchronization of the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31 always remains unchanged, and the intermittent alternating bending operation can always be maintained. During the adjustment process of the lifting main base plate 32, the swing arm middle seat 20 can be adaptively adjusted to the appropriate position without manual adjustment, and after the swing arm middle seat 20 is adaptively adjusted, the rotation amplitude and rotation synchronization of the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31 are high, without delay.Specifically, the back of the frame 10 is fixedly connected to the transmission mechanism mounting frame 50, and the transmission frame 10 is installed with a long strip hole 51 with a long axis extending in the vertical direction. The swing arm middle seat 20 passes through the long strip hole 51, and the swing arm middle seat 20 slides with the long strip hole 51 in the long axis direction of the strip hole. The two axial ends of the swing arm middle seat 20 respectively extending out of the first through hole 37 are respectively hinged to the inner swing arm middle rod 21 and the outer swing arm middle rod 22 arranged in a staggered manner. The rear extension of the lower swing arm transmission shaft 31 out of the long strip hole 51 The end is connected to the lower swing arm power rod 18, and the rear extended end of the upper swing arm transmission shaft 30 extending out of the elongated hole 51 is connected to the upper swing arm power rod 19. With this structure, the elongated hole guides the swing arm middle seat 20, and at the same time installs and positions the upper swing arm transmission shaft and the lower swing arm transmission shaft 31; of course, an upper slide plate 55 is provided on the surface of the transmission mechanism mounting frame 50, and a gap is left between the plate surface of the upper slide plate 55 and the transmission mechanism mounting frame 50, and the two ends of the upper slide plate 55 are fixed to the transmission structure through pads.

[0031] The present invention is not limited to the above-mentioned embodiment. A rear plate fixed in the axial position relative to the sprocket is provided between the driving wheel 39 and the driven sprocket 40 of the chain transmission system, wherein an upper rear plate fixedly connected to the frame 10 is provided between the driving wheel 39 and the driven sprocket 40 of the upper chain transmission system, wherein a pair of lower rear plates fixedly connected to the frame 10 are provided between the driving wheel 39 and the driven sprocket 40 of the lower chain transmission system. In addition, a slide groove 42 for accommodating the tight edge of the transmission chain is provided on the front plate toward the tight side of the transmission chain, and the bending pin 161 extends outward from the slide groove 42, and a chain main base plate 43 is provided on the frame 10, and the lower chain transmission system is provided on the upper end surface of the chain main base plate 43, and the rear plate is provided on the upper end surface of the chain main base plate 43, and the slide groove 42 can axially support the chain along the transmission sprocket to prevent the chain from falling off the sprocket when overloaded. Furthermore, the power device includes a first reducer 52, the input end of the first reducer 52 is fixedly connected to the output end of the motor, one of the output shafts of the first reducer 52 is fixedly connected to a main motor flywheel 27, the eccentric hole provided in the main motor flywheel 27 is hinged to one end of the swing arm connecting rod 28, and the other end of the swing arm connecting rod 28 is hinged to the free end of the rocker arm section 181 provided on the lower swing arm power rod 18. This structure can realize the reciprocating swing of the lower swing arm power rod 18. Furthermore, the other output end of the first reducer 52 is transmission-connected to the input end of the second reducer 29, and the transmission shaft 14 is circumferentially fixed in the plug-in hole of the output end of the second reducer 29. This structure can realize the movement of the transmission chain 15, and the movement synchronization of the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31 always remains unchanged, and can complete the traction of the chain's web ribs and the bending of the web ribs very tacitly. At the same time, this structure can still meet the synchronization requirements of bending operations at different truss heights, and can reduce the transmission mechanism and power device of the entire system. The entire device has high integration and high synchronization, and the mechanical reliability is significantly improved.

[0032] By adopting the above scheme, when the chord reinforcement is continuously bent, the power of the motor is transmitted to the main motor flywheel 27 and the second reducer 29 through the first reducer 52, the lower swing arm power rod 18 swings, and the second reducer 29 transmits part of the power to the fixed transmission shaft 14, the lower swing arm power rod 18 moves synchronously with the transmission shaft 14, the movement of the transmission chain 15, the movement synchronization of the upper swing arm transmission shaft 30 and the lower swing arm transmission shaft 31 always remains unchanged, and the traction of the chain's web reinforcement and the bending of the web reinforcement can be completed very tacitly. At the same time, this structure can still meet the synchronization requirements of bending operations at different truss heights, and can reduce the transmission mechanism and power device of the entire system. The two axial ends of the swing arm intermediate seat 20 are respectively hinged to the staggered inner swing arm middle rod 21 and the outer swing arm middle rod 22, and the swing amplitude and swing rate are synchronized, and then the power transmitted through the rod reaches the upper swing arm transmission rod 24. The movement of the swing arm transmission rod 24 is synchronized with the movement of the lower swing arm power rod. At the same time, part of the power of the lower swing arm power rod is transmitted to the upper swing arm transmission rod 24 through the lower inner swing arm relay rod 231, the inner swing arm middle rod 21, and the upper inner swing arm relay rod 232. At the same time, part of the power of the lower swing arm power rod is transmitted to the upper swing arm transmission rod 24 through the lower outer swing arm relay, the outer swing arm middle rod 22, and the upper outer swing arm relay rod 26. In this way, power can be transmitted through two paths. When the power transmission structure of one path approaches a dead point, the other path can continue to transmit power, which can avoid the situation where the entire power transmission mechanism has a dead point in motion. At the same time, the forces at both ends of each rod component, the inner swing arm middle rod 21, the outer swing arm middle rod 22, the upper swing arm transmission rod 24, and the lower swing arm power rod tend to offset and balance relative to the center position of the rod component, which can facilitate the fixation of each rod component and improve the reliability of the entire transmission system. The rotation of the transmission shaft 14 causes the upper and lower chain drive systems to rotate synchronously. The chains of the upper and lower chain drive systems move simultaneously in the same direction at a speed equal to the linear velocity of the sprocket teeth. The outer side of the transmission chain 15 is fixedly connected to a traction pin 36, which provides support and shaping for the web reinforcement during bending. The power distribution mechanism alternately drives the adjustable swing arm 17 to swing. The bending pin 161 mounted on the adjustable swing arm 17 bends the web reinforcement into a wavy shape along the traction pin 36 mounted on the upper and lower chain drive systems. The uniform motion of the transmission chain 15 and the rhythmic swinging of the two adjustable swing arms 17 bend the straight web reinforcement into a wavy web reinforcement with a fixed pitch, which is then used for subsequent truss welding and forming. The above solution allows for high synchronization between the two adjustment arms 17. To change the web reinforcement node spacing L, the traction chain of the upper and lower chain transmission systems can be replaced simultaneously. Increasing the motor speed increases the web reinforcement bending speed.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It is apparent that various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the present invention. Thus, the present invention is intended to encompass such modifications and variations as long as they fall within the scope of the claims and their equivalents.

Claims

1. A truss welding and bending mechanism, characterized by: comprising a frame (10), and; An upper swing arm transmission shaft (30) and a lower swing arm transmission shaft (31) are supported in parallel on a frame (10), characterized in that: the rear extension end of the lower swing arm transmission shaft (31) is connected to the lower swing arm power rod (18), the rear extension end of the upper swing arm transmission shaft (30) is connected to the upper swing arm power rod (19), and a swing arm intermediate seat (20) is provided on the frame (10) which can slide along the direction of the line connecting the upper swing arm transmission shaft (30) and the lower swing arm transmission shaft (31), and the swing arm The two axial ends of the intermediate seat (20) are respectively hinged to the inner swing arm middle rod (21) and the outer swing arm middle rod (22) arranged in a staggered manner. One end of the inner swing arm middle rod (21) is hinged to one end of the lower inner swing arm relay rod (231) through a first rotation pair (001). The other end of the lower inner swing arm relay rod (231) is hinged to a radial extension section of the lower swing arm power rod (18) through a second rotation pair (002). The other end of the inner swing arm middle rod (21) is hinged to a radial extension section of the lower swing arm power rod (18) through a third rotation pair ( 003) is hinged to one end of the upper inner swing arm relay rod (232), the other end of the upper inner swing arm relay rod (232) is hinged to one end of the upper swing arm transmission rod (24) through the fourth rotation pair (004), one end of the outer swing arm middle rod (22) is hinged to one end of the lower outer swing arm relay rod (25) through the fifth rotation pair (005), the other end of the lower outer swing arm relay rod (25) is hinged to the other end of the lower swing arm power rod (18) through the sixth rotation pair (006). The radially extending end is hinged, the other end of the outer swing arm middle rod (22) is hinged to one end of the upper outer swing arm relay rod (26) through the seventh rotation pair (007), the other end of the upper outer swing arm relay rod (26) is hinged to the other end of the upper swing arm transmission rod (24) through the eighth rotation pair (008), and the lower swing arm power rod (18) is connected to the power device for transmission, and the power device applies power to make the lower swing arm power rod (18) swing back and forth around the lower swing arm transmission shaft (31); Wherein, a swing arm intermediate seat (20) is provided on the frame (10) and can slide along the direction of the line connecting the upper swing arm transmission shaft (30) and the lower swing arm transmission shaft (31); the upper swing arm transmission shaft (30) is supported on the frame (10) and can move relative to the lower swing arm transmission shaft (31); The frame (10) supports an upper chain transmission system and a lower chain transmission system corresponding to each other in the upper and lower directions. The driving wheel (39) of each chain transmission system is connected to the corresponding driven sprocket (40) through a closed transmission chain (15). The outer side of the transmission chain (15) is fixedly connected to the traction pin (36). The bending pins (161) of the upper and lower chain transmission systems are staggered with each other at the position of horizontal projection. A transmission shaft (14) for connecting the power device is provided at the bottom of the frame (10). The extended end of the transmission shaft (14) passes through the driving wheels (39) of the two chain transmission systems in sequence and is circumferentially fixed to the driving wheels (39). The front extended ends of the two swing arm transmission shafts (14) are fixed to the adjustment swing arm (17). The free end of the adjustment swing arm (17) is provided with a bending pin (161). The transmission chain (15) comprises a plurality of main chain plates (151) arranged in an annular manner, three cocircular meshing teeth (a) are provided on the main chain plates (151), the meshing teeth (a) at both ends of the main chain plates (151) are provided with end opening grooves (1512), two adjacent main chain plates (151) are connected by outer chain plates (9), and the two ends of the outer chain plates (9) respectively extend into adjacent end opening grooves (1512) and are hinged to the end opening grooves (1512); The outer circumferences of the driving wheel (39) and the driven sprocket (40) are provided with an annular groove (1521) for making way for the outer chain plate, and an upper meshing flange portion (1522) and a lower meshing flange portion (1523) are respectively provided on both sides of the annular groove (1521), and meshing teeth (a) and tooth grooves (b) are alternately provided on the outer circumferences of the upper meshing flange portion (1522) and the lower meshing flange portion (1523); Through holes (37) for the pin shaft (1513) to pass through are provided at both ends of the outer link plate (9), and a limiting pin is fitted in a limiting pin hole (38) provided on the side wall of the through hole (37), and the inner extension section of the limiting pin extends into the recessed portion on the pin shaft (1513), and the two ends of the pin shaft (1513) respectively extend into the mounting holes on the inner wall of the end opening groove.

2. A truss welding and bending mechanism according to claim 1, characterized in that: The back of the frame (10) is fixedly connected to the transmission mechanism mounting frame (50), and the transmission mechanism mounting frame (50) is provided with a long strip hole (51) with a long axis extending in the vertical direction. The swing arm middle seat (20) passes through the long strip hole (51), and the axial direction of the swing arm middle seat (20) is limited in the width direction of the long strip hole (51). The swing arm middle seat (20) slides with the long strip hole (51) in the long axis direction of the long strip hole (51). The two axial ends of the swing arm middle seat (20) extending out of the first through hole are respectively hinged to the inner swing arm middle rod (21) and the outer swing arm middle rod (22) arranged in a staggered manner. The rear extension end of the lower swing arm transmission shaft (31) extending out of the long strip hole (51) is connected to the lower swing arm power rod (18), and the rear extension end of the upper swing arm transmission shaft (30) extending out of the long strip hole (51) is connected to the upper swing arm power rod (19).

3. A truss welding and bending mechanism according to any one of claims 1 or 2, characterized in that: A lifting main base plate (32) that slides up and down is provided on the frame (10); the upper chain transmission system is supported on the lower end surface of the lifting main base plate (32); the lower swing arm transmission shaft (31) is supported on the upper end surface of the lifting main base plate (32); and the arm length of the adjusting swing arm (17) is adjustable.

4. A truss welding and bending mechanism according to any one of claims 1 or 2, characterized in that: The power device comprises a first reducer (52), the input end of the first reducer (52) is fixedly connected to the output end of the motor, one output shaft of the first reducer (52) is fixedly connected to a main motor flywheel (27), an eccentric hole provided on the main motor flywheel (27) is hinged to one end of a swing arm connecting rod (28), and the other end of the swing arm connecting rod (28) is hinged to the free end of a rocker arm section (181) provided on a lower swing arm power rod (18).

5. A truss welding and bending mechanism according to any one of claims 1 or 2, characterized in that: A rear upright plate fixed in axial position relative to the sprocket is provided between the driving wheel (39) and the driven sprocket (40) of the chain transmission system, and a sliding groove (42) for accommodating the tight side of the transmission chain is provided on the rear upright plate facing the tight side of the transmission chain.

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