Double-layer air pipe and meshing forming device thereof

Abstract

The double-layer air pipe comprises an inner pipe and an outer pipe, the outer pipe is arranged outside the inner pipe, filler is filled between the outer pipe and the inner pipe, supporting plate pieces are arranged at the positions, opposite to the vertex angles, of the outer side wall of the inner pipe, and two supporting elastic plates are arranged at the positions, opposite to the vertex angles, of the inner side wall of the outer pipe; the two supporting elastic plates in the same set abut against the opposite sides of the corresponding supporting plate pieces. The suspension frame is erected on the forming table, a lifting plate seat is vertically arranged on the suspension frame in a sliding mode, a first telescopic cylinder is arranged on the suspension frame, a piston rod of the first telescopic cylinder is connected to the lifting plate seat, a motor is arranged on the lifting plate seat, and a bearing disc is arranged on an output shaft of the motor; the bearing disc is provided with a clamping assembly used for clamping the inner pipe, and the two opposite sides of the forming table are each provided with a plate folding assembly used for pushing a plate to be bent and formed into an outer pipe. The air pipe can have the functions of noise reduction, fire prevention or heat preservation and the like, and the applicability of the air pipe to different use environments is expanded.

Description

Technical Field

[0001] This application relates to the technical field of duct processing and forming, and in particular to a double-layer duct and its bite-forming device. Background Art

[0002] A duct is a pipe system used for air transportation and distribution. It is responsible for transporting air from one place to another to meet the requirements of air circulation, temperature regulation, or air quality in a specific environment.

[0003] Most traditional ducts are single-layer pipes made of aluminum alloy, which are only suitable for some fields with lower requirements. However, some special fields have higher requirements for the air transported by ducts, such as low noise, heat insulation, or fire prevention. Obviously, traditional single-layer ducts cannot meet these requirements and have obvious deficiencies. Summary of the Invention

[0004] In order to improve the applicability of the duct to different use environments, this application provides a double-layer duct and its bite-forming device.

[0005] In a first aspect, a double-layer duct provided by this application adopts the following technical solution: A double-layer duct includes an inner pipe and an outer pipe with a rectangular cross-section. The outer pipe is arranged outside the inner pipe and is coaxial with it. A filler is filled between the inner pipe and the outer pipe. Support plate pieces are arranged at positions corresponding to each vertex angle on the outer side wall of the inner pipe. Two support elastic plates are arranged at positions corresponding to each vertex angle of the inner pipe on the inner side wall of the outer pipe. The two support elastic plates in the same group are pressed against the opposite sides of the corresponding support plate piece. A bending guide rod with a circular cross-section is also placed between the two support elastic plates in the same group. A clamping groove for clamping on the support plate piece is formed on the bending guide rod. The circumferential outer side wall of the bending guide pipe is pressed against the corner of the inner wall of the outer pipe.

[0006] By adopting the above technical solution, the bending guide rod and the support elastic plate cooperate with the support plate piece to realize the support of the inner pipe inside the outer pipe, and a cavity is formed between the outer pipe and the inner pipe and filled with a filler. According to the actual use environment of the duct, the filler uses materials with functions such as noise reduction, heat insulation, or fire prevention, thereby improving the applicability of the duct to different use environments.

[0007] In a second aspect, a bite-forming device for a double-layer duct provided by this application adopts the following technical solution: A double-layer air duct bite-forming device includes a forming table for placing the plate to be bent, and a suspension erected on the forming table. An elevating plate seat is arranged to slide vertically on the suspension, and a first telescopic cylinder is arranged on the suspension with its piston rod connected to the elevating plate seat. A motor is arranged on the elevating plate seat, and a bearing plate is arranged on the output shaft of the motor. Both the motor and the first telescopic cylinder are electrically connected to a control system. A clamping assembly for clamping the inner pipe is arranged on the bearing plate. On both opposite sides of the forming table, there are folding plate assemblies for pushing the plate to be bent into the outer pipe.

[0008] By adopting the above technical solution, the plate to be bent is placed in the middle of the forming table. Then, the piston rod of the first telescopic cylinder first extends downward, so that the clamping assembly on the elevating plate seat drives the inner pipe to move downward and press tightly on the plate to be bent. Then, the two folding plate assemblies simultaneously push the plate upward to be bent into a "concave" shape. Then, the air duct is first rotated 90° forward and then 180° backward, and the two folding plate assemblies bend the plate again in sequence, so as to bend the outer pipe into a "square" shape. Finally, the joint is welded, thus realizing the one-time bite-forming assembly between the inner pipe and the outer pipe.

[0009] Optionally, the clamping assembly includes a four-jaw chuck arranged on the bearing plate, and a pipe-supporting angle plate for pressing against the inner wall of the corresponding inner pipe is arranged on each jaw of the four-jaw chuck.

[0010] By adopting the above technical solution, the worker manually operates the four-jaw chuck, and the four jaws of the four-jaw chuck move away from each other and make the pipe-supporting angle plate press against the inner wall of the inner pipe. During disassembly, operate in the reverse direction, the four jaws approach each other, and the pipe-supporting angle plate disengages from the contact with the inner wall of the pipe, which is convenient to operate.

[0011] Optionally, a support arm hinged to the corresponding jaw is arranged on the pipe-supporting angle plate, and a magnet magnetically attracting the support arm is arranged on the circumferential outer wall of the four-jaw chuck.

[0012] By adopting the above technical solution, during disassembly, when the pipe-supporting angle plate disengages from the contact with the inner wall of the pipe, the worker manually rotates the support arm, and the support arm rotates out of the length range of the inner pipe and is adsorbed by the magnet, so as to facilitate the removal of the air duct after bite-forming from the forming device.

[0013] Optionally, the folding component includes a plurality of second telescopic cylinders arranged beside the forming table and electrically connected to the control system. The piston rods of the plurality of second telescopic cylinders are jointly hinged to a folding push roller, and an avoidance notch is opened on the table surface of the forming table at a position opposite to the folding push roller.

[0014] By adopting the above technical solution, during bending, the control system activates the second telescopic cylinder. The piston rod of the second telescopic cylinder drives the bending roller to move upward through the avoidance notch. While the bending roller pushes the sheet material to bend upward, the bending roller rolls on the sheet material. After the bending action of the sheet material is completed, the piston rod of the second telescopic cylinder retracts downward, driving the bending roller to reset.

[0015] Optionally, an elastic pad is arranged on the circumferential outer side wall of the bending roller.

[0016] By adopting the above technical solution, the elastic pad plays a role in protecting the inner wall of the outer tube.

[0017] Optionally, a guiding groove is vertically opened at a position on the forming table opposite to the second telescopic cylinder. A guiding slider is vertically slidable in the guiding groove. Two pull rods are hinged on the guiding slider. The other ends of the pull rods relative to the guiding slider are hinged with a top block that is slidably sleeved on the piston rod of the second telescopic cylinder. A compression spring is propped between the two top blocks.

[0018] By adopting the above technical solution, the guiding slider slides relative to the guiding groove, and together with the pulling effect of the pull rods on the piston rod of the second telescopic cylinder, it reduces the possibility that the piston rod of the second telescopic cylinder is bent due to excessive reaction force during bending, thereby affecting the forming quality of the air duct.

[0019] Optionally, a fixed-end insertion plate that is inserted and matched with the clamping groove is arranged on the bearing plate. An arm is placed outside the fixed-end insertion plate. Tightening bolts for pressing against the outer side wall of the bending guide rod are threadedly connected to both ends of the arm.

[0020] By adopting the above technical solution, during the forming process, the arm and the tightening bolts cooperate to assemble the bending guide rod on the fixed-end insertion plate, thereby further limiting the position of the bending guide rod, ensuring that the outer tube bends at an accurate position, and improving the forming quality of the air duct.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The bending guide rod and the supporting elastic plate cooperate with the supporting plate to realize the support of the inner tube inside the outer tube, and a cavity is formed between the outer tube and the inner tube and filled with filler. According to the actual use environment of the air duct, the filler adopts materials with functions such as noise reduction, heat preservation or fire prevention, thereby improving the applicability of the air duct to different use environments; 2. The sheet to be bent is placed in the center of the forming table. Then, the piston rod of the first telescopic cylinder first extends downward, and the clamping assembly on the lifting plate seat drives the inner tube to move downward and press tightly on the sheet to be bent. Then, the two folding plate assemblies simultaneously push the sheet upward to be bent into a concave shape. Then, the air duct is first rotated 90° forward and then 180° backward, and the two folding plate assemblies bend the sheet again in sequence, thereby bending the outer tube into a square shape. Finally, the joint is welded, thus realizing the one-time bite-forming assembly between the inner tube and the outer tube. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application.

[0023] Figure 2 is a schematic structural diagram of Embodiment 2 of the present application.

[0024] Figure 3 is a cross-sectional view of the positional relationship among the four-jaw chuck, the support arm, and the magnetic block in Embodiment 2 of the present application.

[0025] Figure 4 is a cross-sectional view of the positional relationship among the top block, the compression spring, and the pull rod in the embodiment of the present application.

[0026] Description of the Reference Numerals: 1, inner tube; 2, outer tube; 3, filler; 4, support plate sheet; 5, support elastic plate; 6, bending guide rod; 61, clamping groove; 7, forming table; 71, avoidance notch; 72, guide groove; 8, suspension; 81, lifting groove; 9, lifting plate seat; 10, first telescopic cylinder; 11, motor; 12, bearing plate; 131, four-jaw chuck; 132, pipe support angle plate; 133, support arm; 134, magnetic block; 141, second telescopic cylinder; 142, bending push roller; 143, elastic pad; 15, guide slider; 16, pull rod; 17, top block; 18, compression spring; 19, fixed-end plug board; 20, clamping arm; 21, fastening bolt. Detailed Description of the Embodiment

[0027] The following further describes the present application in detail Figures 1-4 with reference to the accompanying drawings.

[0028] Embodiment 1 of the present application discloses a double-layer air duct and its bite-forming device.

[0029] Embodiment 1 Referring to Figure 1 , the double-layer air duct includes an inner tube 1 with a rectangular cross-section and an outer tube 2. The outer tube 2 is located outside the inner tube 1 and is coaxial with it. There is a gap between the inner tube 1 and the outer tube 2, and the gap is filled with a filler 3. The filler 3 uses materials such as noise reduction, heat insulation, or fire prevention in the prior art.

[0030] On the outer side wall of the inner pipe 1, support plate pieces 4 are integrally formed at positions corresponding to each vertex angle. On the inner side wall of the outer pipe 2, two support elastic plates 5 are welded at positions corresponding to each vertex angle of the inner pipe 1. The two support elastic plates 5 in the same group are abutted against the opposite sides of the corresponding support plate piece 4. The support elastic plates 5 are made of metal plates.

[0031] Referring to Figure 1 , a bent guide rod 6 with a circular cross-section is also placed between the two support elastic plates 5 in the same group. A clamping groove 61 for clamping on the support plate piece 4 is formed on the bent guide rod 6. The outer circumferential side wall of the bent guide is abutted against the corner of the inner wall of the outer pipe 2.

[0032] The implementation principle of Embodiment 1 is as follows: The bent guide rod 6 and the support elastic plates 5 cooperate with the support plate pieces 4 to realize the support of the inner pipe 1 inside the outer pipe 2, and a cavity is formed between the outer pipe 2 and the inner pipe 1 and filled with the filler 3. The filler 3 is made of a material with functions such as noise reduction, heat preservation, or fire prevention according to the actual use environment of the air duct, thereby improving the applicability of the air duct to different use environments.

[0033] Embodiment 2 Referring to Figure 2 , a double-layer air duct bite-forming device includes a forming table 7 for placing the plate to be bent, and a suspension 8 bolted to the forming table 7. The suspension 8 is in a gate shape, and vertical lifting grooves 81 are formed on both vertical side walls of the suspension 8. A lifting plate seat 9 is slidably fitted in the lifting grooves 81.

[0034] Referring to Figure 2 , two first telescopic cylinders 10 electrically connected to the control system are bolted to the top of the suspension 8. One lifting plate seat 9 corresponds to one first telescopic cylinder 10. The piston rod of the first telescopic cylinder 10 passes through the suspension 8 and is threadedly connected to the lifting plate seat 9.

[0035] Referring to Figure 2 and Figure 3 , a motor 11 electrically connected to the control system is bolted to the lifting plate seat 9. The output shaft of the motor 11 passes through the lifting plate seat 9 and is coaxially bolted with a bearing plate through a flange. The motor 11 is a forward and reverse servo motor 11 in the prior art.

[0036] Referring to Figure 2 and Figure 3 , a clamping assembly for clamping the inner pipe 1 is arranged on the bearing plate 12, and folding plate assemblies for pushing the plate to be bent into the outer pipe 2 are arranged on both opposite sides of the forming table 7.

[0037] Referring to Figure 2 and Figure 3, the clamping assembly includes a four-jaw chuck 131 coaxially bolted to the bearing disc 12. A support arm 133 is hinged to each jaw of the four-jaw chuck 131. A support pipe angle plate 132 for abutting against the inner wall corner of the inner pipe 1 is welded to the other end of the support arm 133 relative to the jaw. The cross-section of the support pipe angle plate 132 is L-shaped. Magnet blocks 134 for magnetically attracting the support arm 133 are embedded on the circumferential outer side wall of the four-jaw chuck 131.

[0038] Referring to Figure 2 and Figure 3 , the worker pre-assembles the bending guide rod 6 on the support plate sheet 4 on the forming table 7. Then, the support arm 133 is rotated, and the support pipe angle plate 132 is turned into the length range of the inner pipe 1. Then, the four-jaw chuck 131 is operated, and the four support pipe angle plates 132 move away from each other and respectively abut against the four top corners of the inner wall of the inner pipe 1.

[0039] Referring to Figure 2 and Figure 3 , subsequently, the piston rod of the first telescopic cylinder 10 retracts upward, thereby lifting the inner pipe 1 to a suspended state first. Then, the unbent sheet for forming the outer pipe 2 is placed in the center of the forming table 7.

[0040] Referring to Figure 2 and Figure 3 , the bending assembly includes a plurality of second telescopic cylinders 141 bolted beside the forming table 7 and electrically connected to the control system. The piston rods of the plurality of second telescopic cylinders 141 are jointly hinged to a bending push roller 142. An elastic pad 143 is bonded to the circumferential outer side wall of the bending push roller 142. An avoidance notch 71 is opened at the position of the tabletop of the forming table 7 relative to the bending push roller 142.

[0041] Referring to Figure 2 and Figure 3 , the piston rod of the first telescopic cylinder 10 extends downward, driving the inner pipe 1 to move downward until the two lower bending guide rods 6 contact the sheet. During this process, the support elastic plates 5 between the two bending guide rods 6 respectively abut against the corresponding support plate sheets 4 and undergo bending deformation.

[0042] Referring to Figure 2 and Figure 3 , then, the piston rods of the two groups of second telescopic cylinders 141 extend upward simultaneously, pushing the bending push roller 142 through the avoidance notch 71. The bending push roller 142 pushes the sheet to bend and the bending push roller 142 rolls on the sheet until the sheet is bent into a concave shape.

[0043] Referring to Figure 2 and Figure 3, thereafter, the first telescopic cylinder 10 lifts the air duct to a suspended state, the control system starts the motor 11, the output shaft of the motor 11 drives the bearing plate 12 to rotate, and the bearing plate 12 drives the air duct to rotate forward 90° through the clamping assembly. Then, the air duct is placed on the forming table 7 again, and the corresponding bending assembly operates to bend one side of the plate.

[0044] Next, repeat the above operation steps, rotate the air duct 180° in the reverse direction, and bend the other side of the plate. Thus, the flat plate is bent into the outer tube 2 in a square shape, and the outer tube 2 and the inner tube 1 are integrally clamped and formed. Finally, weld the joint of the outer tube 2.

[0045] Refer to Figure 2 and Figure 3 , as for the installation between the filler 3 and the air duct, it can be loaded into the air duct after the air duct is completely formed, or during the process of clamping and forming the outer tube 2, each part can be sequentially and synchronously loaded into the air duct.

[0046] Refer to Figure 2 and Figure 4 , during the process of the bending push roller 142 pushing the plate to bend, it also receives the reaction force of the plate, and the reaction force is transmitted to the piston rod of the second telescopic cylinder 141. Therefore, the piston rod of the second telescopic cylinder 141 may be bent.

[0047] Therefore, a guide groove 72 is vertically opened at a position on the forming table 7 beside the second telescopic cylinder 141. A guide slider 15 slides vertically in the guide groove 72, and the cross-sections of the guide slider 15 and the guide groove 72 are both in a dovetail shape.

[0048] Refer to Figure 2 and Figure 4 , two pull rods 16 are hinged on the guide slider 15. The other ends of the pull rods 16 relative to the guide slider 15 are hinged with a top block 17 that slidably sleeved on the piston rod of the second telescopic cylinder 141. A compression spring 18 is propped between the two top blocks 17.

[0049] Refer to Figure 2 and Figure 4 , during the process of the piston rod of the second telescopic cylinder 141 extending, the compression spring 18 pushes the two top blocks 17 on the piston rod to move away from each other, and with the pulling effect of the pull rods 16 on the top blocks 17, the possibility of the piston rod of the second telescopic cylinder 141 bending and deforming is reduced.

[0050] Refer to Figure 2 and Figure 3 , a fixed-end plug board 19 that is inserted and matched with the clamping groove 61 is welded on the bearing plate 12, and one fixed-end plug board 19 corresponds to one clamping groove 61. A U-shaped clamping arm 20 is placed outside the fixed-end plug board 19, and fastening bolts 21 for tightly pressing against the outer side wall of the bending guide rod 6 are threadedly connected to both sides of the clamping arm 20.

[0051] During the forming process, the clamping arm 20 and the fastening bolt 21 cooperate to assemble the bending guide rod 6 on the fixed-end insertion plate 19, thereby further limiting the position of the bending guide rod 6, ensuring that the outer tube 2 is bent at the accurate position, and improving the forming quality of the air duct.

[0052] The implementation principle of Embodiment 2 is as follows: The worker pre-assembles the bending guide rod 6 on the support plate piece 4 on the forming table 7. The clamping groove 61 at the end is inserted and matched with the fixed-end insertion plate 19 and is connected by the clamping arm 20 and the fastening bolt 21.

[0053] Subsequently, rotate the support arm 133, and the pipe-supporting angle plate 132 is rotated into the length range of the inner tube 1. Then, operate the four-jaw chuck 131, and the four pipe-supporting angle plates 132 move away from each other and respectively abut against the four top corners of the inner wall of the inner tube 1. Then, the piston rod of the first telescopic cylinder 10 retracts upward, thereby lifting the inner tube 1 to a suspended state first.

[0054] Place the unbent sheet for forming the outer tube 2 in the middle on the forming table 7. The piston rod of the first telescopic cylinder 10 extends downward again, driving the inner tube 1 to move downward until the two lower bending guide rods 6 contact the sheet. During this process, the support elastic plates 5 between the two bending guide rods 6 respectively abut against the corresponding support plate pieces 4 and undergo bending deformation.

[0055] Then, the piston rods of the two groups of second telescopic cylinders 141 extend upward simultaneously, pushing the bending roller 142 through the avoidance notch 71. The bending roller 142 pushes the sheet to bend and the bending roller 142 rolls on the sheet until the sheet is bent into a concave shape.

[0056] After that, the first telescopic cylinder 10 lifts the air duct to a suspended state. The control system starts the motor 11, and the output shaft of the motor 11 drives the bearing disc 12 to rotate. The bearing disc 12 drives the air duct to rotate forward 90° through the clamping assembly. Then, place the air duct on the forming table 7 again, and the corresponding bending assembly acts to bend one side of the sheet.

[0057] Next, repeat the above operation steps, rotate the air duct 180° in the reverse direction, and bend the other side of the sheet. Thus, the flat sheet is bent into an outer tube 2 in the shape of a square, and the outer tube 2 and the inner tube 1 are integrally formed by clamping.

[0058] After removing the air duct from the clamping and forming device, weld the joint of the outer tube 2, cut off the excess length of the bending guide rod 6, and then install the filler 3.

[0059] The above are all the preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A double-layer air duct, characterized in that: The invention comprises an inner tube (1) and an outer tube (2) with rectangular cross sections, the outer tube (2) being arranged outside the inner tube (1) and coaxial therewith, a filler (3) being filled between the inner tube (1) and the outer tube (2), a support plate (4) being arranged at a position of each vertex of the outer side wall of the inner tube (1), two support elastic plates (5) being arranged at a position of each vertex of the inner side wall of the outer tube (2), the two support elastic plates (5) of the same group being pressed against the opposite sides of the corresponding support plate (4), a bending guide rod (6) with a circular cross section being arranged between the two support elastic plates (5), the bending guide rod (6) being provided with a clamping groove (61) for clamping on the support plate (4), and the circumferential outer side wall of the bending conduit being pressed against the corner of the inner wall of the outer tube (2).

2. A bite forming device for producing the double-layer air duct according to claim 1, characterized in that: The invention comprises a forming table (7) for placing a plate to be bent, and a suspension (8) mounted on the forming table (7); a lifting plate seat (9) is arranged on the suspension (8) for vertical sliding; a first telescopic cylinder (10) is arranged on the suspension (8), and the piston rod of the first telescopic cylinder (10) is connected to the lifting plate seat (9); a motor (11) is arranged on the lifting plate seat (9), and a bearing plate (12) is arranged on the output shaft of the motor (11); the motor (11) and the first telescopic cylinder (10) are both electrically connected to a control system; a clamping assembly for clamping an inner tube (1) is arranged on the bearing plate (12); and folding plate assemblies for pushing the plate to bend into an outer tube (2) are arranged on opposite sides of the forming table (7).

3. The double-layer air duct bite forming device according to claim 2, characterized in that: The clamping assembly comprises a four-jaw chuck (131) arranged on a carrier plate (12), and each jaw of the four-jaw chuck (131) is provided with a tube support angle plate (132) for pressing against the inner wall of the corresponding inner tube (1).

4. The double-layer air duct bite forming device according to claim 2, characterized in that: The tube support angle plate (132) is provided with a support arm (133) hinged to a corresponding clamping claw, and a magnetic block (134) magnetically attracted to the support arm (133) is provided on the circumferential outer wall of the four-jaw chuck (131).

5. The double-layer air duct bite forming device according to claim 2, characterized in that: The bending assembly comprises a plurality of second telescopic cylinders (141) arranged beside a forming table (7) and electrically connected to a control system, the piston rods of the plurality of second telescopic cylinders (141) being jointly hinged with a bending push roller (142), and an avoidance notch (71) being provided on the table surface of the forming table (7) relative to the bending push roller (142).

6. The double-layer air duct bite forming device according to claim 2, characterized in that: An elastic pad (143) is arranged on the circumferential outer side wall of the bending push roller (142).

7. The double-layer air duct bite forming device according to claim 2, characterized in that: A guide groove (72) is vertically provided on the forming table (7) at a position relative to the second telescopic cylinder (141), a guide slider (15) is vertically slidable in the guide groove (72), two pull rods (16) are hinged on the guide slider (15), and a top block (17) slidably mounted on the piston rod of the second telescopic cylinder (141) is hinged at the other end of the pull rod (16) relative to the guide slider (15), and a compression spring (18) is supported between the two top blocks (17).

8. The double-layer air duct bite forming device according to claim 2, characterized in that: The carrier plate (12) is provided with a fixed end plug plate (19) which is plugged into the clamping groove (61), and a clamp arm (20) is placed outside the fixed end plug plate (19). Both ends of the clamp arm (20) are threadedly connected with fastening bolts (21) for tightening against the outer wall of the bending guide rod (6).

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