A production equipment for large-diameter tunnel air ducts

Abstract

The present invention relates to the technical field of tunnel air duct production equipment, and specifically discloses a large-diameter tunnel air duct production equipment, which includes: at least two unwinding mechanisms for unwinding the air duct fabric; a splicing and welding group arranged downstream of the unwinding mechanism for thermally splicing and joining the air duct fabric units unwound by at least two unwinding mechanisms; a ridge welding group for welding the hanging buckle ridges on the air duct fabric; a forming and folding group arranged downstream of the ridge welding group for folding the two sides of the air duct fabric towards the middle direction. The present invention can produce large-diameter tunnel air ducts, which effectively integrates each link of air duct production, realizes continuous production without human intervention, ensures product quality control, and greatly improves production efficiency; in terms of personnel employment, only 1-2 people are needed to operate the equipment, and only feeding and guarding are required to maintain the production state, and the labor intensity is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel air duct production equipment, and specifically discloses a large-diameter tunnel air duct production equipment. Background Art

[0002] Tunnel air ducts are usually made by thermally synthesizing engineering plastic sheets into cylinders to form ventilation ducts. Their production process is extended from the manufacturing process of traditional mine air ducts. The manufacturing process of traditional mine air ducts is: a forming process of welding using a small single-head hot air heat-sealing machine, relying on manual fixed-length cutting, and then moving to the hot air blower for welding. The feeding, edge alignment, and sorting during the welding process are also completed by the personnel at each station. The maximum diameter can reach 1 meter, and the length can only reach 20 meters (because the material has a certain elasticity, and manual feeding and edge alignment rely entirely on human perception and reference marks on the material. As the length increases, the misalignment becomes more serious). The production speed of the formed air duct is 2 - 4 meters / min, and 5 - 8 people are required to cooperate to complete it. However, the diameter of tunnel air ducts often exceeds 2 meters (the unfolded width is 6.28 meters), and the length basically requires more than 50 meters. To manufacture tunnel air ducts, a splicing process must be used. Coupled with the extremely long length requirements, it is impossible to meet the forming and manufacturing of tunnel air ducts through small single-head hot air equipment and infinitely increasing the number of personnel. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems, and provides a production equipment capable of producing large-diameter tunnel air ducts, which can continuously produce, reduce the labor force, and improve production efficiency.

[0004] The purpose of the present invention is achieved by the following technical solutions: A large-diameter tunnel air duct production equipment, which includes:

[0005] At least two unwinding mechanisms for unwinding the air duct fabric;

[0006] A splicing and welding group arranged downstream of the unwinding mechanism for thermally splicing and joining the air duct fabric units unwound by at least two unwinding mechanisms;

[0007] A ridge welding group arranged downstream of the splicing and welding group; the ridge welding group includes a ridge roll mounting structure for unwinding the hanging buckle ridge, a ridge unfolding mechanism for unfolding the unwound hanging buckle ridge, a ridge welding mechanism for thermally welding the unfolded hanging buckle ridge to the surface of the spliced air duct fabric, a ridge welding pressure roller group for pressing the welded hanging buckle ridge and the air duct fabric, and a ridge welding traction roller group for pulling the air duct fabric welded with the hanging buckle ridge downstream;

[0008] A cylinder forming and folding group arranged downstream of the ridge welding group for folding the two sides of the air duct fabric towards the middle direction;

[0009] The tube welding group is arranged downstream of the tube folding group and is used for heat-sealing and welding the folded air duct cloth into shape.

[0010] Furthermore, the splicing welding group includes a splicing welding traction roller group, a welding steel pressure roller group, a splicing welding air gun, an air gun inlet and outlet cylinder and a booster fan which are respectively arranged on the frame; the air gun inlet and outlet cylinder is connected to the splicing welding air gun for controlling the movement of the splicing welding air gun; the booster fan is connected to the splicing welding air gun, the welding steel pressure roller group is used to press the air duct cloth after welding, and the splicing welding traction roller group is located downstream of the welding steel pressure roller group for pulling the pressed air duct cloth downstream.

[0011] The splicing welding air gun includes an air gun body, an air gun joint arranged at the upper end of the air gun body, a nozzle arranged at the lower end of the air gun body, and a thermocouple arranged inside the air gun body; the air gun joint is connected to the booster fan, and the air gun body is connected to the air inlet and outlet cylinders of the air gun.

[0012] The spine unfolding mechanism includes an unfolding base plate, an unfolding beak arranged at the front end of the unfolding base plate, and two unfolding pressure wheel frames arranged on the upper surface of the unfolding base plate; the rear end of the unfolding beak expands to both sides so that it can stretch out the two adhesive parts of the hook spine; an avoidance gap is formed between the two unfolding pressure wheel frames for the hook part of the hook spine to pass through; and, unfolding pressure wheels are symmetrically arranged on the two unfolding pressure wheel frames, and a gap is formed between the unfolding pressure wheels and the unfolding base plate for the two adhesive parts of the hook spine to pass through, and the unfolding pressure wheels on the two unfolding pressure wheel frames are both inclined so that the unfolding pressure wheels can guide the two adhesive parts of the hook spine to the opening direction.

[0013] The spine welding mechanism includes an air gun up and down moving cylinder, an air gun left and right moving slide rail arranged on the air gun up and down moving cylinder, two spine welding air guns arranged on the air gun left and right moving slide rails through air gun left and right moving sliders, two air gun left and right moving cylinders fixed on the air gun left and right moving slide rails and respectively used to push the two spine welding air guns, and a spine welding booster fan respectively connected to the two spine welding air guns; the structures of the two spine welding air guns are the same as that of the splicing welding air gun, and are respectively used to weld the two adhesive parts of the hook spine to the surface of the air duct cloth.

[0014] The tube forming and folding group comprises a folding mechanism and two folding and arranging rods respectively arranged downstream of the folding mechanism;

[0015] The folding mechanism includes a folding support frame, a support shaft mounting seat that is movably disposed up and down on the folding support frame, a folding support shaft mounted on the support shaft mounting seat, and a support shaft lifting mechanism connected to the support shaft mounting seat for driving the support shaft mounting seat to move up and down; the length of the folding support shaft is less than the width of the spliced air duct cloth, so that after the air duct cloth is disposed thereon, both sides of the air duct cloth can be folded downward to form folding portions; two folding and arranging rods are respectively used for arranging the folding portions on both sides of the air duct cloth.

[0016] The folding and arranging rods include a main supporting rod for supporting the folding portion, and a first guiding supporting rod and a second guiding supporting rod respectively disposed on the main supporting rod; the first guiding supporting rod and the second guiding supporting rod are inclined for guiding the folding portion towards the center of the air duct cloth.

[0017] The cylinder-forming welding group includes a cylinder-forming welding mechanism for welding the folding portions on both sides of the air duct cloth together, a cylinder-forming welding pressure roller group disposed downstream of the cylinder-forming welding mechanism, and a cylinder-forming traction roller group disposed downstream of the cylinder-forming welding pressure roller group.

[0018] As another implementation manner, the large-diameter tunnel air duct production equipment further includes a finished product folding group disposed downstream of the cylinder-forming welding group;

[0019] The finished product folding group includes a lifting support, two folding reciprocating slide rails that are liftably disposed on the lifting support, and a folding roller assembly whose two ends are respectively installed on the two folding reciprocating slide rails through folding reciprocating sliders;

[0020] The folding roller assembly includes a first rotary box motor and a second rotary box motor respectively installed on two folding reciprocating sliders, a first rotary box connected to the first rotary box motor, a second rotary box connected to the second rotary box motor, a folding roller driving motor disposed inside the first rotary box, a driving gear installed on the rotating shaft of the folding roller driving motor, a first auxiliary gear and a second auxiliary gear respectively meshing with the driving gear, a first folding roller connected between the first auxiliary gear and the second rotary box, and a second folding roller connected between the second auxiliary gear and the second rotary box; the rotation directions of the first auxiliary gear and the second auxiliary gear are opposite.

[0021] As another implementation manner, a post-cylinder-forming traction group is further disposed between the cylinder-forming welding group and the finished product folding group;

[0022] The post-cylinder-forming traction group includes a bow support mechanism and a post-cylinder-forming traction roller group disposed downstream of the bow support mechanism;

[0023] The bow support mechanism includes a fixed seat, a bow support slide rail arranged on the fixed seat, two rotating discs respectively mounted at both ends of the bow support slide rail through sliders, and an expanding cylinder respectively connected to the two rotating discs for driving the two rotating discs to move.

[0024] Compared with the prior art, the present application has the following beneficial effects: The present invention can produce a large-diameter tunnel air duct, which effectively integrates all links of air duct production, realizes continuous production without human intervention, ensures product quality control, and greatly improves production efficiency; in terms of personnel employment, the operation of the equipment only requires 1-2 people, and only feeding and guarding are needed to maintain the production state, and the labor intensity is greatly reduced.

[0025] Some additional features of the present application can be described below. Through the inspection of the following description and the corresponding drawings, or the understanding of the production or operation of the embodiments, some additional features of the present application are obvious to those skilled in the art. The features disclosed in the present application can be realized and achieved through the practice or use of various methods, means and combinations of the specific embodiments described below. Brief Description of the Drawings

[0026] The drawings described herein are used to provide a further understanding of the present application, form a part of the present application, and the schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation to the present application. In each figure, the same reference numerals represent the same components. Among them,

[0027] Figure 1 is a schematic structural diagram of the present invention.

[0028] Figure 2 is a schematic structural diagram of the material feeding group of the present invention.

[0029] Figure 3 is a schematic structural diagram of the splicing and welding group of the present invention.

[0030] Figure 4 is a schematic structural diagram of the splicing and welding air gun of the present invention.

[0031] Figure 5 is a schematic diagram after splicing multiple air duct fabrics.

[0032] Figure 6 is a schematic structural diagram of the ridge welding group of the present invention.

[0033] Figure 7 is a top view of the ridge unfolding mechanism of the present invention.

[0034] Figure 8 is a cross-sectional view of the ridge unfolding mechanism of the present invention.

[0035] Figure 9Schematic cross-sectional view of the buckle spine.

[0036] Figure 10 Schematic cross-sectional view when the two pasting parts of the buckle spine are unfolded.

[0037] Figure 11 Schematic diagram of the spine welding mechanism of the present invention.

[0038] Figure 12 Schematic cross-sectional view when the buckle spine is welded on the surface of the air duct fabric.

[0039] Figure 13 Schematic structural diagram of the folding mechanism of the present invention.

[0040] Figure 14 Schematic diagram when the folding and arranging rod of the present invention is in use.

[0041] Figure 15 Schematic diagram of the two folding parts of the air duct fabric folding towards the center of the air duct fabric.

[0042] Figure 16 Schematic diagram after the air duct fabric is flipped.

[0043] Figure 17 Schematic diagram of the use state of the front finishing rack of the present invention.

[0044] Figure 18 Schematic structural diagram of the bow support mechanism of the present invention.

[0045] Figure 19 Schematic diagram of the use state of the bow support mechanism of the present invention.

[0046] Figure 20 Schematic structural diagram of the finished product folding group of the present invention.

[0047] Figure 21 Schematic structural diagram of the folding roller assembly of the present invention.

[0048] Figure 22 、 23 Schematic diagram when the air duct is folded.

[0049] The reference numerals in the above drawings are: 100-discharging group, 101-coil chuck seat, 102-width adjustment slider, 103-side fine-tuning bottom beam, 104-side moving bottom beam, 105-side photoelectric sensor, 106-discharging base, 107-discharging guide roller, 200-discharging tension control group, 201-discharging traction roller group, 202-tension detection roller, 300-joining welding group, 310-joining welding air gun, 311-air gun joint, 312-air gun body, 313-nozzle, 314-thermocouple, 320-welding steel pressure roller group, 340-joining welding traction roller group, 360-boosting fan, 370-air gun inlet and outlet cylinder, 400-joining tension control group, 410-joining traction roller group, 500 -Splicing finishing group, 510-Splicing edge suction moving slide rail, 520-Splicing edge suction device, 600-Back welding group, 610-Back welding pressure roller group, 620-Back welding traction roller group, 630-Back roll installation structure, 640-Back steering column, 650-Back welding mechanism, 651-Air gun up and down moving cylinder, 652-Air gun left and right moving slide rail, 653-Air gun left and right moving slider, 654-Air gun left and right moving cylinder, 655-Back welding air gun, 660-Back unfolding mechanism, 661-Unfolding bottom plate, 662-Unfolding pressure wheel frame, 663-Avoiding gap, 664-Unfolding pressure wheel, 665-Unfolding eagle beak, 700-Tube folding group, 710-Folding mechanism, 711-Folding support frame, 71 2-support shaft lifting mechanism, 713-support shaft mounting seat, 714-folding support shaft, 720-folding sorting rod, 721-main support rod, 722-first guide support rod, 723-second guide support rod, 800-folding traction group, 810-folding traction roller, 900-folding deviation correction group, 910-correction group guide wheel, 920-front sorting frame, 921-lower sorting rod, 922-upper sorting rod, 930-upper edge suction device, 940-lower edge suction device, 950-folding opposite edge sensor group, 1000-tube welding group, 1001-tube traction roller group, 1002-tube welding pressure roller group, 1003-tube welding mechanism, 1100-tube rear traction group, 1110-bow support mechanism, 1111-fixed seat, 1 112-opening cylinder, 1113-rotating disk, 1114-bow supporting slide rail, 1120-pulling roller group after tube formation, 1200-finished product folding group, 1202-folding lifting slide rail, 1203-folding lifting motor, 1204-folding lifting screw, 1205-folding reciprocating slide rail, 1206-folding reciprocating slider, 1207-folding roller assembly, 1208-first rotating box motor, 1209-first rotating box, 1210-folding roller driving motor, 1211-driving gear, 1212-first auxiliary gear, 1213-second auxiliary gear, 1214-first folding roller, 1215-second folding roller, 1216-second rotating box, 1217-second rotating box motor, 1218-cutting guide rail,1219 - Cutting knife, 1300 - Air duct cloth, 1310 - Folding part, 1400 - Hanging buckle back, 1410 - Hanging buckle part, 1420 - Adhesive part., Detailed implementation mode

[0050] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0051] It should be noted that if the terms "first", "second", etc. are involved in the description and claims of this application and the above-mentioned drawings, they are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here. In addition, if the terms "including" and "having" and any variations thereof are involved, the intention is to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0052] In this application, if the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0053] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0054] In addition, in the present application, if terms such as "installation", "setting", "provided with", "connection", "connected", "socketed" are involved, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0055] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0056] Embodiment

[0057] As Figure 1 shown, this embodiment discloses a large-diameter tunnel air duct production device, which includes a feeding group 100, a splicing and welding group 300, a ridge welding group 600, a tube-forming and folding group 700, and a tube-forming welding group 1000 that are sequentially arranged along the set conveying direction. Among them, the feeding group 100 includes at least two feeding mechanisms, and each feeding mechanism is respectively used for unwinding a piece of air duct cloth 1300; that is, a roll of air duct cloth roll is installed on each feeding mechanism, and each feeding mechanism can simultaneously unwind the air duct cloth roll thereon. The downstream splicing and welding group 300 then splices multiple air duct cloth units into a wider-width air duct cloth 1300, so that the tunnel air duct production device of this embodiment can produce large-diameter tunnel air ducts.

[0058] As Figure 2 shown, in this embodiment, the number of feeding mechanisms is set to three, and the positions of the three feeding mechanisms can be staggered front and back, up and down, to ensure that the vertical projections of the edges of the three unwound air duct cloth units can overlap, so as to facilitate heat-sealing and welding the edges of the three air duct cloth units together subsequently to form a wider-width air duct cloth 1300.

[0059] Specifically, the feeding mechanism includes a feeding base 106, an opposite-side moving bottom beam 104 arranged on the feeding base 106, an opposite-side fine-tuning bottom beam 103 arranged on the opposite-side moving bottom beam 104, two width adjustment slide blocks 102 respectively arranged at both ends of the opposite-side fine-tuning bottom beam 103, and coiled material chuck seats 101 respectively arranged on the two width adjustment slide blocks 102. The two width adjustment slide blocks 102 can adopt existing electric slide block modules, so the two width adjustment slide blocks 102 can slide on the opposite-side fine-tuning bottom beam 103, thereby adjusting the distance between the two width adjustment slide blocks 102, enabling the two width adjustment slide blocks 102 to clamp air duct cloth rolls with different widths. The opposite-side fine-tuning bottom beam 103 can be installed on the opposite-side moving bottom beam 104 by means of existing electric lead screws, electric slide block modules, etc., so that the opposite-side fine-tuning bottom beam 103 can move left and right on the opposite-side moving bottom beam 104 to finely adjust the position of the air duct cloth roll. Similarly, the opposite-side moving bottom beam 104 can also be installed on the feeding base 106 by means of electric lead screws, electric slide block modules, etc., so that the opposite-side moving bottom beam 104 can move left and right on the feeding base 106 to make a larger adjustment to the position of the air duct cloth roll. The position of the air duct cloth roll is adjusted through the above structure to ensure that the edges of the subsequent air duct cloth units can overlap within a set width range.

[0060] In addition, each feeding mechanism can also include a feeding guide roller 107, and the air duct cloth unit after unwinding is conveyed downstream after passing around the feeding guide roller 107. At the same time, two opposite-side photoelectric sensors 105 for detecting the edges of the air duct cloth unit can also be arranged on the feeding base 106. The positions of the two side edges of the air duct cloth unit are detected by the opposite-side photoelectric sensors 105, and their detection signals can be sent to an external controller, and the external controller controls the movement of the opposite-side moving bottom beam 104 and the opposite-side fine-tuning bottom beam 103 to achieve the position adjustment of the air duct cloth unit. Specifically, a magnetic powder brake or the like can be arranged on the coiled material chuck seat 101 to control unwinding. Since it is an existing mature technology, it will not be elaborated too much.

[0061] Specifically, a feeding tension control group 200 can also be arranged downstream of each feeding mechanism to control the conveying tension of the air duct cloth unit. The feeding tension control group 200 includes a feeding traction roller group 201 and a tension detection roller 202 arranged downstream of the feeding traction roller group 201. The feeding traction roller group 201 includes a pressure roller and a traction roller. The air duct cloth unit passes between the pressure roller and the traction roller. The pressure roller is used to clamp the air duct cloth unit on the traction roller, and when the traction roller rotates, it can traction the air duct cloth unit downstream. Of course, the feeding traction roller group 201 also includes components such as a motor for driving the traction roller to rotate. Since this design is an existing conventional design, it will not be elaborated.

[0062] A pressure sensor is provided on the mounting seat of the tension detection roller 202. During operation, the air duct fabric unit bypasses the tension detection roller 202. Since the air duct fabric unit is tensioned during the conveying process, the air duct fabric unit will apply pressure to the tension detection roller 202. The pressure sensor sends the pressure signal to an external controller, and the controller can adjust the traction speed of the feeding traction roller group 201 according to the pressure, thereby adjusting the tension of the air duct fabric unit to ensure that the tension of each air duct fabric unit is consistent.

[0063] As Figure 1 shown, the splicing and welding group 300 is arranged downstream of the feeding tension control group 200 and is used to thermally splice multiple air duct fabric units unrolled by the feeding mechanism into a wider-width air duct fabric 1300.

[0064] As Figure 3 shown, the splicing and welding group 300 includes a splicing and welding traction roller group 340, a welding steel pressure roller group 320, a splicing and welding air gun 310, an air gun inlet and outlet cylinder 370, and a booster fan 360 respectively arranged on the frame. The air gun inlet and outlet cylinder 370 is connected to the splicing and welding air gun 310 and is used to control the movement of the splicing and welding air gun 310. The booster fan 360 is connected to the splicing and welding air gun 310 and is used to supply air to the splicing and welding air gun 310. The welding steel pressure roller group 320 is used to press the welded air duct fabric 1300. The splicing and welding traction roller group 340 is located downstream of the welding steel pressure roller group 320 and is used to traction the welded air duct fabric 1300 downstream.

[0065] As Figure 4 shown, the splicing and welding air gun 310 includes an air gun body 312, an air gun joint 311 arranged at the upper end of the air gun body 312, a nozzle 313 arranged at the lower end of the air gun body 312, and a thermocouple 314 arranged inside the air gun body 312; the air gun joint 311 is connected to the booster fan 360, and the air gun body 312 is connected to the air gun inlet and outlet cylinder 370. The air inside the air gun body 312 is heated by the thermocouple 314 and then sprayed out from the nozzle 313.

[0066] Multiple air duct fabric units coming out of the feeding tension control group 200 are guided to the welding steel pressure roller group 320. The welding steel pressure roller group 320 is composed of two longer rollers, and multiple air duct fabric units pass through between the two rollers. The air gun inlet and outlet cylinder 370 extends, driving the splicing and welding air gun 310 to make the nozzle 313 of the splicing and welding air gun 310 close to the two rollers, and heating the splicing surfaces of adjacent two air duct fabric units to make the splicing surfaces in a semi-molten state. The welding steel pressure roller group 320 then squeezes the air duct fabric units to splice adjacent two air duct fabric units together, as Figure 5As shown in the figure. Specifically, since multiple air duct fabric units are spliced together, multiple air gun inlet and outlet cylinders 370 and multiple splicing welding air guns 310 can be provided to weld multiple air duct fabric units simultaneously. In this embodiment, the air gun inlet and outlet cylinders 370 and the splicing welding air guns 310 can be set in two groups to splice three air duct fabric units simultaneously. The spliced air duct fabric 1300 is pulled downstream by the splicing welding traction roller group 340. Similarly, the splicing welding traction roller group 340 is also composed of a pressure roller and a traction roller, which will not be elaborated here. When the equipment needs to stop, control the action of the air gun inlet and outlet cylinder 370 to move the splicing welding air gun 310 away from the air duct fabric unit to prevent the air duct fabric unit from being damaged by the residual heat of the splicing welding air gun 310.

[0067] After welding, the heated part of the air duct fabric 1300 may shrink. As an implementation manner of this embodiment, a splicing tension control group 400 can be provided downstream of the splicing welding group 300. Specifically, the splicing tension control group 400 includes a splicing traction roller group 410. Similarly, the splicing traction roller group 410 is also composed of a pressure roller and a traction roller. The air duct fabric 1300 enters the splicing traction roller group 410 through the traction roller. The high temperature of the welding part will be quickly conducted out through the metal surfaces of the pressure roller and the traction roller to control the shrinkage of the weld seam. With the large-area support of the steel roller, the flatness of the weld seam is guaranteed, preparing for the processing of the next link.

[0068] To better organize the air duct fabric 1300, a splicing finishing group 500 can also be provided downstream of the splicing tension control group 400. Specifically, the splicing finishing group 500 includes a splicing edge suction device moving slide rail 510 arranged on the frame and two splicing edge suction devices 520 respectively arranged at both ends of the splicing edge suction device moving slide rail 510. The two splicing edge suction devices 520 can move on the splicing edge suction device moving slide rail 510. In addition, guide rollers can be provided upstream of the two splicing edge suction devices 520, and a set of damping rollers can be provided downstream of the two splicing edge suction devices 520. During operation, the two splicing edge suction devices 520 respectively clamp the two side edges of the air duct fabric 1300 to perform edge pulling and finishing on the air duct fabric 1300, so that the air duct fabric 1300 is laid flat on the roller surface of the guide roller and passes through between the two damping rollers. The damping rollers can provide a certain material surface tension to the air duct fabric 1300. The splicing edge suction device 520 can be realized by using an existing edge suction device in the textile industry.

[0069] In order to facilitate the installation of the tunnel air duct in the tunnel, a hanging buckle ridge 1400 is welded on the tunnel air duct, and the tunnel air duct is installed in the tunnel through the hanging buckle ridge. The ridge welding group 600 of this embodiment is used to weld the hanging buckle ridge to the air duct fabric 1300, and it is arranged downstream of the splicing finishing group 500.

[0070] Such as Figure 6As shown, the spine welding group 600 includes a spine roll installation structure 630 for unwinding the hook spine 1400, a spine unfolding mechanism 660 for unfolding the unwound hook spine 1400, a spine welding mechanism 650 for heat-sealing and welding the unfolded hook spine 1400 to the surface of the spliced air duct cloth 1300, a spine welding pressure roller group 610 for pressing the welded hook spine 1400 and the air duct cloth 1300, and a spine welding traction roller group 620 for pulling the air duct cloth 1300 welded with the hook spine 1400 downstream.

[0071] The buckle back 1400 is a prefabricated T-shaped material with a metal buckle, which includes a buckle portion 1410 and two adhesive portions 1420 connected to the lower end of the buckle portion 1410. The specific structure is as follows: Figure 9 As shown. Among them, the spine roll installation structure 630 includes a servo motor, a pneumatic brake connected to the servo motor, a mounting shaft installed on the pneumatic brake and other components. The hook back 1400 is a rolled material. When in use, the hook back roll is installed on the mounting shaft, and the hook back roll installation structure 630 unwinds the hook back roll. In the specific setting, a spine steering column 640 can be set on the frame. After unwinding, the hook back 1400 pulled out bypasses the spine steering column 640 and the conveying direction is changed, so that the conveying direction of the hook back 1400 is consistent with the conveying direction of the air duct cloth 1300, which is convenient for the subsequent welding process.

[0072] The spine deployment mechanism 660 is located downstream of the spine roll mounting structure 630, such as Figure 6 , 7 As shown, it includes an unfolding base plate 661 , an unfolding beak 665 arranged at the front end of the unfolding base plate 661 , and two unfolding pressure wheel frames 662 arranged on the upper surface of the unfolding base plate 661 .

[0073] The front end of the unfolding beak 665 is pointed, and the rear end thereof expands to both sides, so that the unfolding beak 665 can open the two adhesive portions 1420 of the hook spine 1400 to both sides. An escape gap 663 is formed between the two unfolding pressure wheel frames 662 for the hook portion 1410 of the hook spine 1400 to pass through. Figure 8 As shown; and, the two unfolding pressure rollers 664 are symmetrically arranged on the two unfolding pressure roller frames 662, and a gap is formed between the unfolding pressure rollers 664 and the unfolding bottom plate 661 for the two adhesive portions 1420 of the buckle spine 1400 to pass through. In addition, the unfolding pressure rollers 664 on the two unfolding pressure roller frames 662 are tilted, so that the two symmetrical unfolding pressure rollers 664 are distributed in an "eight" shape, as shown in FIG. Figure 7 As shown, the unfolding pressing wheel 664 is tilted to guide the two adhesive portions 1420 so that the two adhesive portions 1420 are opened as shown in FIG.Figure 10 The shape shown. Specifically, when setting, the unfolding pressing wheels 664 on each unfolding pressing wheel frame 662 can be set to multiple, and the unfolding pressing wheels 664 on the two unfolding pressing wheel frames 662 are symmetrically distributed. Through the guiding of multiple groups of unfolding pressing wheels 664, it is ensured that the two pasting parts 1420 can be opened, further ensuring the subsequent welding quality.

[0074] During operation, the hooking back 1400 redirected by the back turning column 640 is pulled to the back unfolding mechanism 660. When the hooking back 1400 passes through the unfolding beak 665, the two pasting parts 1420 are separated. Then, the two pasting parts 1420 respectively pass through between the unfolding bottom plate 661 and the unfolding pressing wheels 664 on the two unfolding pressing wheel frames 662. At the same time, the hooking part 1410 passes through the avoidance gap 663. Under the squeezing action of the unfolding pressing wheels 664, the hooking back 1400 is unfolded into Figure 10 the shape shown.

[0075] The air duct cloth 1300 and the unfolded hooking back 1400 are both pulled to the back welding press roller group 610, and the hooking back 1400 is located above the air duct cloth 1300. The back welding mechanism 650 is located upstream of the back welding press roller group 610 and close to the back welding press roller group 610, as Figure 11 shown. The back welding mechanism 650 includes an air gun up and down moving cylinder 651, an air gun left and right moving slide rail 652 arranged on the air gun up and down moving cylinder 651, two back welding air guns 655 respectively arranged on the air gun left and right moving slide rail 652 through air gun left and right moving sliders 653, two air gun left and right moving cylinders 654 fixed on the air gun left and right moving slide rail 652 and respectively used to push the two back welding air guns 655, and a back welding supercharging fan respectively connected to the two back welding air guns 655.

[0076] During welding, control the actions of the air gun up and down moving cylinder 651 and the air gun left and right moving cylinder 654 to move the nozzle of the back welding air gun 655 to a position close to the two pasting parts 1420 and the air duct cloth 1300. The two back welding air guns 655 respectively heat the welding surfaces of the two pasting parts 1420 and the air duct cloth 1300. As the air duct cloth 1300 and the hooking back 1400 move forward, the back welding press roller group 610 presses and welds the hooking back 1400 on the air duct cloth 1300, as Figure 12 shown. The structures of the two back welding air guns 655 are the same as the structure of the above-mentioned splicing welding air gun 310, and the specific structure will not be elaborated here.

[0077] As Figure 1As shown, the cylinder folding group 700 is arranged downstream of the spine welding group 600 and is used to fold the two sides of the air duct cloth 1300 towards the middle direction. Specifically, the cylinder folding group 700 includes a folding mechanism 710 and two folding and arranging rods 720 respectively arranged downstream of the folding mechanism 710.

[0078] As Figure 13 shown, the folding mechanism 710 includes a folding support frame 711, a support shaft mounting seat 713 movably arranged up and down on the folding support frame 711, a folding support shaft 714 mounted on the support shaft mounting seat 713, and a support shaft lifting mechanism 712 connected to the support shaft mounting seat 713 and used to drive the support shaft mounting seat 713 to move up and down. Specifically, the support shaft mounting seat 713 and the folding support frame 711 can be connected by means of the cooperation of a slide rail and a slider, so that the support shaft mounting seat 713 can move up and down, thereby being able to adjust the height of the folding support shaft 714. The support shaft lifting mechanism 712 can adopt a driving method of a cylinder or the cooperation of a motor and a screw rod. The folding support shaft 714 is used to support the air duct cloth 1300, and its length needs to be less than the width of the spliced air duct cloth 1300, so that after the air duct cloth 1300 is placed on it, the two sides of the air duct cloth 1300 can be folded down to form a folding part 1310, as Figure 13 shown. The length of the folding support shaft 714 can be adjusted to make it applicable to air duct cloth 1300 with different widths. Specifically, the folding support shaft 714 can adopt a way of sleeving inner and outer tubes to realize length adjustment, or it can also adopt a way of detachably splicing multiple shafts to realize length adjustment.

[0079] The two folding and arranging rods 720 are respectively used to arrange the folding parts 1310 on both sides of the air duct cloth 1300. As Figure 14 shown, the folding and arranging rod 720 includes a main supporting rod 721 for supporting the folding part 1310, and a first guiding supporting rod 722 and a second guiding supporting rod 723 respectively arranged on the main supporting rod 721; both the first guiding supporting rod 722 and the second guiding supporting rod 723 are inclined. During the forward movement of the air duct cloth 1300, the first guiding supporting rod 722 and the second guiding supporting rod 723 can guide the folding part 1310 towards the center of the air duct cloth 1300, so that the folding parts 1310 on both sides of the air duct cloth 1300 overlap each other, as Figure 15 shown.

[0080] As Figure 1 shown, a folding traction group 800 can be arranged downstream of the cylinder folding group 700. The folding traction group 800 is composed of two folding traction rollers 810 to establish tension for the folded air duct cloth 1300 and realize downstream traction. Similarly, the folding traction rollers 810 are also driven to rotate by driving components such as motors, which will not be specifically described here.

[0081] In order to edge-align the folding parts 1310, as Figure 1 shown, a folding alignment group 900 is provided downstream of the cylindrical folding group 700. The folding alignment group 900 includes an alignment group guide roller 910, a front finishing frame 920, an upper edge suction device 930, a lower edge suction device 940, and a folding edge alignment sensor group 950 arranged in sequence along the conveying direction. Among them, the alignment group guide roller 910 is located below the folding traction group 800, and the air duct cloth 1300 is turned over after passing around the alignment group guide roller 910, that is, after the air duct cloth 1300 passes around the alignment group guide roller 910, the folding parts 1310 on both sides are turned to the upper side, as Figure 16 shown.

[0082] As Figure 17 shown, the front finishing frame 920 includes an upper finishing rod 922 and a lower finishing rod 921 arranged vertically. When the air duct cloth 1300 is conveyed forward, the two folding parts 1310 are respectively placed on the upper finishing rod 922 and the lower finishing rod 921, so that the two folding parts 1310 are staggered up and down, as Figure 17 shown, so as to edge-align the two folding parts 1310 subsequently. The upper edge suction device 930 and the lower edge suction device 940 are respectively arranged downstream of the upper finishing rod 922 and the lower finishing rod 921, and are respectively used to adjust the positions of the upper and lower folding parts 1310, so that the upper and lower folding parts 1310 are kept within a set overlapping dimension range. Specifically, both the upper edge suction device 930 and the lower edge suction device 940 can be arranged in multiple numbers front and back, so as to achieve pre-alignment and precise alignment. Similarly, both the upper edge suction device 930 and the lower edge suction device 940 also adopt edge suction devices in the textile industry, which can prevent the material from running off to the left and right by changing the direction of the frictional force. The folding edge alignment sensor group 950 is composed of two photoelectric sensors, and the two photoelectric sensors are respectively arranged downstream of the upper edge suction device 930 and the lower edge suction device 940, and are used to detect the edge position information of the upper and lower folding parts 1310. The external controller controls the angles of the upper edge suction device 930 and the lower edge suction device 940 through the position information to achieve precise edge alignment.

[0083] In addition, a conveyor belt can be provided below the front finishing frame 920, and the part of the air duct cloth 1300 other than the two folding parts 1310 is placed on the conveyor belt and conveyed forward by the conveyor belt.

[0084] The cylindrical welding group 1000 is arranged downstream of the cylindrical folding group 700, and is used to thermally weld and weld the air duct cloth 1300 sent out by the folding alignment group 900 into a tunnel air duct. As Figure 1As shown, the cylinder-forming welding group 1000 includes a cylinder-forming welding mechanism 1003 for welding the folded portions 1310 on both sides of the air duct fabric 1300 together, a cylinder-forming welding pressure roller group 1002 disposed downstream of the cylinder-forming welding mechanism 1003, and a cylinder-forming traction roller group 1001 disposed downstream of the cylinder-forming welding pressure roller group 1002.

[0085] Similarly, the cylinder-forming welding mechanism 1003 is similar to the welding mechanism in the splicing welding group 300, that is, it also includes a welding blowtorch, a blowtorch inlet and outlet cylinder, and a supercharging blower, which will not be described in detail here. After the two folded portions 1310 are welded together, the entire air duct fabric 1300 is formed into an air duct. The cylinder-forming welding pressure roller group 1002 dissipates heat from and extrudes the welded folded portions 1310, and the cylinder-forming traction roller group 1001 provides traction for the upper layer of the formed tunnel air duct.

[0086] As an implementation manner of this embodiment, as Figure 1 shown, a post-cylinder-forming traction group 1100 is further disposed downstream of the cylinder-forming welding group 1000. The post-cylinder-forming traction group 1100 includes a support bow mechanism 1110 and a post-cylinder-forming traction roller group 1120 disposed downstream of the support bow mechanism 1110.

[0087] When the tunnel air duct is formed, the support bow mechanism 1110 is located inside the tunnel air duct. Specifically, as Figure 18 shown, the support bow mechanism 1110 includes a fixed seat 1111, a support bow slide rail 1114 disposed on the fixed seat 1111, two rotating disks 1113 respectively mounted at both ends of the support bow slide rail 1114 through sliders, and a spreading cylinder 1112 respectively connected to the two rotating disks 1113 for driving the two rotating disks 1113 to move.

[0088] During use, the two rotating disks 1113 are pushed towards both ends of the support bow slide rail 1114, so that the two rotating disks 1113 squeeze both sides of the tunnel air duct, causing the tunnel air duct to fold in half and flatten, as Figure 19 shown. The two rotating disks 1113 can move on the support bow slide rail 1114, so that the support bow mechanism 1110 is applicable to tunnel air ducts of different diameters. The folded and flattened tunnel air duct is pulled downstream by the post-cylinder-forming traction roller group 1120.

[0089] As Figure 1 shown, a finished product folding group 1200 is further disposed downstream of the post-cylinder-forming traction group 1100. As Figure 20 shown, the finished product folding group 1200 includes a lifting bracket, two folding reciprocating slide rails 1205 that are liftably disposed on the lifting bracket, and a folding roller assembly 1207 whose two ends are respectively mounted on the two folding reciprocating slide rails 1205 through folding reciprocating sliders 1206.

[0090] As Figure 21 shown, the folding roller assembly 1207 includes a first rotary box motor 1208 and a second rotary box motor 1217 respectively installed on two folding reciprocating sliders 1206, a first rotary box 1209 connected to the first rotary box motor 1208, a second rotary box 1216 connected to the second rotary box motor 1217, a folding roller drive motor 1210 disposed inside the first rotary box 1209, a driving gear 1211 installed on the rotating shaft of the folding roller drive motor 1210, a first auxiliary gear 1212 and a second auxiliary gear 1213 respectively meshing with the driving gear 1211, a first folding roller 1214 connected between the first auxiliary gear 1212 and the second rotary box 1216, and a second folding roller 1215 connected between the second auxiliary gear 1213 and the second rotary box 1216; the first auxiliary gear 1212 and the second auxiliary gear 1213 rotate in opposite directions.

[0091] The following combines Figure 22 and 23 to illustrate the folding principle: As Figure 22 shown, the flattened tunnel air duct passes through between the first folding roller 1214 and the second folding roller 1215. The first rotary box motor 1208 drives the first rotary box 1209 to rotate counterclockwise, and the second rotary box motor 1217 drives the second rotary box 1216 to rotate clockwise. At this time, the first folding roller 1214 is located above the second folding roller 1215, and the folding roller assembly 1207 is controlled to move leftward along the folding reciprocating slide rail 1205 to a set position. Then, as Figure 23 shown, the first rotary box motor 1208 drives the first rotary box 1209 to rotate clockwise, and the second rotary box motor 1217 drives the second rotary box 1216 to rotate counterclockwise. At this time, the second folding roller 1215 is located above the first folding roller 1214, and the folding roller assembly 1207 is controlled to move rightward along the folding reciprocating slide rail 1205 to a set position. By repeating the above actions, the tunnel air duct is folded. During the folding process, as the stacked tunnel air duct becomes higher and higher, the folding reciprocating slide rail 1205 is correspondingly controlled to gradually rise along the lifting bracket.

[0092] Specifically, as Figure 20 shown, the lifting bracket includes a folding lifting slide rail 1202, a folding lifting screw 1204 disposed on the folding lifting slide rail 1202, and a folding lifting motor 1203 connected to the folding lifting screw 1204. The folding reciprocating slide rail 1205 is installed on the folding lifting screw 1204. When the folding lifting motor 1203 drives the folding lifting screw 1204 to rotate, the folding reciprocating slide rail 1205 can move up and down.

[0093] As another implementation, a cutting guide rail 1218 can be provided between the two folding reciprocating slide rails 1205. A cutting knife 1219 is installed on the cutting guide rail 1218 through a slider. By controlling the cutting knife 1219 to move along the cutting guide rail 1218, the folded tunnel air duct can be cut off.

[0094] This embodiment can produce large-diameter tunnel air ducts, which effectively integrates all aspects of air duct production, realizes continuous production without human intervention, ensures product quality control, and greatly improves production efficiency. In terms of personnel employment, only 1-2 people are required to operate the equipment, and only feeding and guarding are needed to maintain the production state, and the labor intensity is greatly reduced.

[0095] It should be noted that all the features disclosed in this specification, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0096] In addition, the above specific embodiments are exemplary. Those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation to the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A large-diameter tunnel air duct production device, characterized in that, Including: At least two unwinding mechanisms for unwinding the air duct fabric (1300); A splicing and welding group (300) arranged downstream of the unwinding mechanism for thermally fusing and splicing the air duct fabric units unwound by at least two unwinding mechanisms; A ridge welding group (600) arranged downstream of the splicing and welding group (300); the ridge welding group (600) includes a ridge roll mounting structure (630) for unwinding the hook ridge (1400), a ridge unfolding mechanism (660) for unfolding the unwound hook ridge (1400), a ridge welding mechanism (650) for thermally fusing and welding the unfolded hook ridge (1400) to the surface of the spliced air duct fabric (1300), a ridge welding pressure roller group (610) for pressing the welded hook ridge (1400) and the air duct fabric (1300), and a ridge welding traction roller group (620) for pulling the air duct fabric (1300) welded with the hook ridge (1400) downstream; A cylinder folding group (700) arranged downstream of the ridge welding group (600) for folding the two sides of the air duct fabric (1300) towards the middle; A cylinder welding group (1000) arranged downstream of the cylinder folding group (700) for thermally fusing and welding the folded air duct fabric (1300) into a shape; The ridge unfolding mechanism (660) includes an unfolding base plate (661), an unfolding beak (665) arranged at the front end of the unfolding base plate (661), and two unfolding pressure wheel frames (662) arranged on the upper surface of the unfolding base plate (661); the rear end of the unfolding beak (665) expands towards both sides so as to be able to open the two pasted parts (1420) of the hook ridge (1400); a avoiding gap (663) for the hook part (1410) of the hook ridge (1400) to pass through is formed between the two unfolding pressure wheel frames (662); and, unfolding pressure wheels (664) are symmetrically arranged on the two unfolding pressure wheel frames (662), a gap for the two pasted parts (1420) of the hook ridge (1400) to pass through is formed between the unfolding pressure wheels (664) and the unfolding base plate (661), and the unfolding pressure wheels (664) on the two unfolding pressure wheel frames (662) are both inclined so that the unfolding pressure wheels (664) can guide the two pasted parts (1420) of the hook ridge (1400) towards the opening direction.

2. The large-diameter tunnel air duct production equipment according to claim 1, characterized in that, The splicing and welding group (300) includes a splicing and welding traction roller group (340), a welding steel pressure roller group (320), a splicing and welding air gun (310), an air gun inlet and outlet cylinder (370), and a booster fan (360) respectively arranged on the frame; the air gun inlet and outlet cylinder (370) is connected to the splicing and welding air gun (310) for controlling the movement of the splicing and welding air gun (310); the booster fan (360) is connected to the splicing and welding air gun (310), the welding steel pressure roller group (320) is used to press the welded air duct cloth (1300), and the splicing and welding traction roller group (340) is located downstream of the welding steel pressure roller group (320) for pulling the pressed air duct cloth (1300) downstream.

3. The large-diameter tunnel air duct production equipment according to claim 2, wherein The splicing and welding air gun (310) includes an air gun body (312), an air gun joint (311) arranged at the upper end of the air gun body (312), a nozzle (313) arranged at the lower end of the air gun body (312), and a thermocouple (314) arranged inside the air gun body (312); the air gun joint (311) is connected to the booster fan (360), and the air gun body (312) is connected to the air gun inlet and outlet cylinder (370).

4. The large-diameter tunnel air duct production equipment according to claim 3, characterized in that The ridge welding mechanism (650) includes an air gun up and down moving cylinder (651), an air gun left and right moving slide rail (652) arranged on the air gun up and down moving cylinder (651), two ridge welding air guns (655) respectively arranged on the air gun left and right moving slide rail (652) through air gun left and right moving sliders (653), two air gun left and right moving cylinders (654) fixed on the air gun left and right moving slide rail (652) and respectively used to push the two ridge welding air guns (655), and a ridge welding booster fan respectively connected to the two ridge welding air guns (655); the structures of the two ridge welding air guns (655) are the same as the structure of the splicing and welding air gun (310), and are respectively used to weld the two bonding parts (1420) of the hanging buckle ridge (1400) on the surface of the air duct cloth (1300).

5. The large-diameter tunnel air duct production equipment according to claim 1, characterized in that, The cylinder forming and folding group (700) includes a folding mechanism (710) and two folding and finishing rods (720) respectively arranged downstream of the folding mechanism (710); The folding mechanism (710) includes a folding support frame (711), a support shaft mounting seat (713) movably arranged up and down on the folding support frame (711), a folding support shaft (714) mounted on the support shaft mounting seat (713), and a support shaft lifting mechanism (712) connected to the support shaft mounting seat (713) and used to drive the support shaft mounting seat (713) to move up and down; the length of the folding support shaft (714) is less than the width of the spliced air duct cloth (1300), so that after the air duct cloth (1300) is placed on it, both sides of the air duct cloth (1300) can be folded down to form folding parts (1310); the two folding and finishing rods (720) are respectively used to finish the folding parts (1310) on both sides of the air duct cloth (1300).

6. The large-diameter tunnel air duct production equipment according to claim 5, characterized in that, The folding and arranging rod member (720) includes a main supporting rod (721) for supporting the folding part (1310), and a first guiding supporting rod (722) and a second guiding supporting rod (723) respectively arranged on the main supporting rod (721); the first guiding supporting rod (722) and the second guiding supporting rod (723) are inclined to guide the folding part (1310) towards the center of the air duct cloth (1300).

7. The large-diameter tunnel air duct production equipment according to claim 1, characterized in that The cylinder-forming welding group (1000) includes a cylinder-forming welding mechanism (1003) for welding the folding parts (1310) on both sides of the air duct cloth (1300) together, a cylinder-forming welding pressure roller group (1002) arranged downstream of the cylinder-forming welding mechanism (1003), and a cylinder-forming traction roller group (1001) arranged downstream of the cylinder-forming welding pressure roller group (1002).

8. The large-diameter tunnel air duct production equipment according to claim 1, characterized in that, It further includes a finished product folding group (1200) arranged downstream of the cylinder-forming welding group (1000); The finished product folding group (1200) includes a lifting bracket, two folding reciprocating slide rails (1205) that are liftably arranged on the lifting bracket, and a folding roller assembly (1207) whose two ends are respectively installed on the two folding reciprocating slide rails (1205) through folding reciprocating sliders (1206); The folding roller assembly (1207) includes a first rotating box motor (1208) and a second rotating box motor (1217) respectively installed on two folding reciprocating sliders (1206), a first rotating box (1209) connected to the first rotating box motor (1208), a second rotating box (1216) connected to the second rotating box motor (1217), a folding roller driving motor (1210) arranged inside the first rotating box (1209), a driving gear (1211) installed on the rotating shaft of the folding roller driving motor (1210), a first auxiliary gear (1212) and a second auxiliary gear (1213) respectively meshing with the driving gear (1211), a first folding roller (1214) connected between the first auxiliary gear (1212) and the second rotating box (1216), and a second folding roller (1215) connected between the second auxiliary gear (1213) and the second rotating box (1216); the rotating directions of the first auxiliary gear (1212) and the second auxiliary gear (1213) are opposite.

9. The large-diameter tunnel air duct production equipment according to claim 8, characterized in that A post-cylinder-forming traction group (1100) is also arranged between the cylinder-forming welding group (1000) and the finished product folding group (1200); The post-cylinder-forming traction group (1100) includes a bow support mechanism (1110) and a post-cylinder-forming traction roller group (1120) arranged downstream of the bow support mechanism (1110); The bow support mechanism (1110) includes a fixed seat (1111), a bow support slide rail (1114) arranged on the fixed seat (1111), two rotating discs (1113) respectively installed at both ends of the bow support slide rail (1114) through sliders, and a spreading cylinder (1112) respectively connected to the two rotating discs (1113) for driving the two rotating discs (1113) to move.

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