A circular tube bending device and bending method for a seat frame

Abstract

The present invention relates to the technical field of circular tube bending, and discloses a circular tube bending device and a bending method for a seat frame, including two groups of conveying lines. A processing table is arranged on the left side of the two groups of conveying lines. Feeding components are arranged on the opposite sides of the two groups of conveying lines. A limiting component is slidably connected to the processing table, and a transmission component is arranged between the limiting component and the feeding component; A arched frame is fixedly installed on the top of the processing table, a stamping component is arranged in the middle of the arched frame, and positioning components are arranged on the front and rear sides of the arched frame. By driving the rotation of the rotating shaft by a motor and cooperating with the transmission of the sprocket and the chain, a row of rotating shafts are driven to rotate synchronously, thereby driving the rotating arm to rotate, driving the feeding plate to move along a circular path, the second clamp upwardly holds the circular tube to be bent and moves it to the left, and places it on the first clamp, so that the circular tube to be bent is intermittently transferred to the left; thus achieving the purpose of maintaining the feeding rhythm and keeping the bending efficiency of the circular tube stable.

Description

Technical Field

[0001] The present invention relates to the technical field of circular tube bending, and specifically to a circular tube bending device and bending method for a seat frame. Background Art

[0002] The skeletons of some seats are composed of metal tubes. By bending the metal tubes and then welding multiple bent metal tubes, the seat skeletons are assembled. When bending the metal tubes, manual bending machines, hydraulic bending machines or numerical control bending machines are generally used.

[0003] A Chinese patent with an application date of June 11, 2024 and a publication number of CN118321407B discloses a bending device and method for circular tube production, which relates to the technical field of circular tube bending. The present invention includes a circular tube member and a processing platform provided on a processing box, and further includes a positioning part and a bending part; the positioning part is provided on the processing platform for quickly positioning the center point of the circular tube member; the bending part is provided on the processing platform for realizing the quick bending of the circular tube member. The advantages are as follows: The present invention can realize the quick multi-angle bending operation of circular tubes with various pipe diameters, and can also make circular tubes with different pipe diameters always be on the same center line with the bending part during bending, so that there will be no angular error during bending. It can also perform pressure positioning and pressure resistance support protection on the inner and outer sides of the circular tube during bending, which can improve the stability of circular tube bending and avoid cracking and damage of the inner and outer sides of the circular tube due to large deformation pressure during bending.

[0004] In this technical solution, multiple components need to be adjusted to position and support the circular tube, and the preparation time before bending is relatively long, resulting in a slow processing rhythm and low production efficiency, making it difficult to meet the processing requirements of a large number of seat skeletons, so further improvement can be made. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a circular tube bending device and bending method for a seat frame, which have the advantages of high processing efficiency and automatic calibration of the position of the circular tube, and solve the problems of long preparation time before bending and low processing efficiency.

[0007] (II) Technical Solutions

[0008] To achieve the above object of high processing efficiency and automatic calibration of the position of the round tube, the present invention provides the following technical solutions: A round tube bending device for a seat frame includes two sets of conveying lines. A processing table is arranged on the left side of the two sets of conveying lines. Feeding components are arranged on the opposite sides of the two sets of conveying lines. A limiting component is slidably connected to the processing table. A transmission component is arranged between the limiting component and the feeding component; A arched frame is fixedly installed on the top of the processing table. A stamping component is arranged in the middle of the arched frame. Positioning components are arranged on the front and rear sides of the arched frame. A loosening component is arranged between the limiting component and the processing table.

[0009] Preferably, each set of the conveying lines includes a support frame. A support plate is fixedly installed on the upper part of the side of the support frame. The cross section of the support plate is L-shaped. A row of clamping seats one are arranged in an array on the horizontal part of the support plate. Each clamping seat one is composed of two cushion strips. The cross section of the cushion strip is semi-circular.

[0010] Preferably, an extension plate is embedded in the middle of the processing table. The extension plate extends between the left ends of the two support plates. A convex platform is fixedly installed on the top of the right end of the extension plate. Two guiding grooves are penetrated and opened on the extension plate. The two guiding grooves are distributed front and back. An avoidance groove is penetrated and opened on the left half of the extension plate. The avoidance groove is located between the two guiding grooves. Two sliding grooves are opened on the top of the extension plate. The two sliding grooves are located between the two guiding grooves and the sliding grooves penetrate the avoidance groove.

[0011] Preferably, each set of the feeding components includes a row of rotating shafts rotatably connected below the support plate. A rotating arm is fixedly installed at one end of the rotating shaft. A feeding plate is hinged at the end of the rotating arm far from the rotating shaft. The cross section of the feeding plate is inverted L-shaped. A row of clamping seats two are arranged in an array on the top of the feeding plate. Each clamping seat two is composed of two cushion columns. The cross section of the cushion column is semi-circular; A sprocket is fixedly installed at the other end of the rotating shaft. The sprockets are connected by a chain. The motor is fixedly installed on the leftmost rotating shaft.

[0012] Preferably, the limiting component includes two cushion blocks. The two cushion blocks are distributed front and back. A sliding column is fixedly installed at the bottom of each cushion block. Two clamping plates are fixedly installed on the top of the two cushion blocks. The two clamping plates are distributed left and right. The upper half of the clamping plate is inclined. And the upper halves of the two clamping plates are inclined towards the opposite sides. A supporting column is rotatably connected between the front and rear ends of the two clamping plates; The sliding column is slidably connected through the guiding groove. A connecting plate is fixedly installed between the bottom ends of the two sliding columns.

[0013] Preferably, the transmission assembly includes a slide rail, a transverse moving seat is slidably connected in the slide rail, four sets of sleeves are fixedly installed on the top of the transverse moving seat, a plug rod is slidably connected to the top end of each sleeve, and the four plug rods are respectively fixed to the bottoms of two feeding plates; a support is arranged at the left end of the slide rail, a gear is rotatably connected to the support, a first rack plate is fixedly installed on the top of the transverse moving seat, the first rack plate is engaged with the bottom of the gear, a second rack plate is fixedly installed on the bottom of the connecting plate, and the second rack plate is engaged with the top of the gear.

[0014] Preferably, the stamping assembly includes a hydraulic cylinder fixedly installed at the center of the top of the arch-shaped frame, the output end of the hydraulic cylinder penetrates through the arch-shaped frame, a stamping head is fixedly installed at the bottom of the output end of the hydraulic cylinder, the stamping head is located directly above the avoidance groove, the left view of the stamping head is an isosceles right triangle, and the bottom is in an arc transition, and embedding grooves are arranged on both side surfaces of the stamping head, and the cross section of the embedding groove is semicircular.

[0015] Preferably, slots are respectively formed through the left and right sides of the arch-shaped frame; the positioning assembly includes a vertical plate inserted into the slots, an outer baffle is fixedly installed at one end of the vertical plate located outside the arch-shaped frame, an inner baffle is fixedly installed at one end of the vertical plate located inside the arch-shaped frame, a spring is fixedly installed between the outer baffle and the arch-shaped frame, two vertical grooves are formed through the inner baffle, a V-shaped groove is formed through the upper half of the vertical plate, a linear groove is formed through the lower half of the vertical plate, and the bottom end of the V-shaped groove is communicated with the top end of the linear groove; the positioning assembly further includes a U-shaped plate slidably connected through the middle of the arch-shaped frame, the middle of the U-shaped plate is fixedly installed on the bottom output end of the hydraulic cylinder, L-shaped plates are fixedly installed at both ends of the U-shaped plate, the L-shaped plates are in an inverted L shape, the vertical parts of the L-shaped plates are slidably connected through the arch-shaped frame, two fixing plates are fixedly installed at the bottom end of each L-shaped plate, the two fixing plates are respectively slidably connected in the vertical grooves, and a roller is fixedly installed between the two fixing plates, and the roller is slidably connected in the V-shaped groove and the linear groove.

[0016] Preferably, the loosening assembly includes an E-shaped plate, the height of the E-shaped plate is equal to the height of the cushion block, the E-shaped plate has three inserted teeth, the top view of the E-shaped plate is in an E shape, an inclined surface is arranged at the top of each inserted tooth, and the length of the middle inserted tooth is less than the lengths of the two side inserted teeth; slide bars are fixedly installed at the bottoms of the two side inserted teeth, the two slide bars are respectively slidably connected in the two chutes, a tension spring is fixedly installed on the right side of the E-shaped plate, the end of the tension spring far away from the E-shaped plate is fixedly installed on the convex platform, steel wires are fixedly installed at the left ends of the two slide bars, threading holes are arranged in the extension plate and the processing table, the steel wires pass through the threading holes, two guide pipes are fixedly installed on the top of the arch-shaped frame, the steel wires are slidably connected through the horizontal part of the arch-shaped frame, the steel wires pass through the guide pipes, and the top ends of the steel wires are fixedly installed on the horizontal parts of the L-shaped plates.

[0017] The bending method of the bending device for the circular tube of the seat frame is as follows:

[0018] S1. Drive the rotation of the rotating shaft through the motor, and with the transmission of the sprocket and chain, drive a row of rotating shafts to rotate synchronously, thereby driving the rotating arm to rotate, driving the feeding plate to move along a circular path, and during this process, the second clamping seat lifts the circular tube to be bent upward and moves it to the left, and places it on the first clamping seat, so that the circular tube to be bent is intermittently transferred to the left;

[0019] S2. When the feeding plate moves along the circular path, the inserting rod moves up and down relative to the sleeve, and drives the sleeve and the transverse moving seat to move left and right reciprocally. Then, through the transmission of the first rack plate, the gear and the second rack plate, drive the connecting plate to move left and right reciprocally, and the moving direction of the connecting plate is opposite to that of the transverse moving seat. Through the connection of the sliding column, the cushion block and the clamping plate move synchronously with the connecting plate. When the cushion block and the clamping plate move to the rightmost side of their stroke, the feeding plate transfers the circular tube to be bent between the two clamping plates, and the two supporting columns lift the circular tube to be bent;

[0020] S3. When the sliding column moves leftward along the guiding groove, driving the circular tube to be bent to move leftward synchronously. When the circular tube to be bent moves directly above the avoiding groove, the motor stops driving the rotating shaft to rotate. Then, the output end of the hydraulic cylinder extends, driving the U-shaped plate and the L-shaped plate to move downward. During the sliding of the roller in the V-shaped groove, drive the vertical plate to slide into the arched frame first, and then slide out of the arched frame. Clamp the circular tube to be bent from both sides through the two inner baffles, and push the circular tube to be bent to move, so that the middle part of the circular tube to be bent is directly below the punching head;

[0021] S4. The output end of the hydraulic cylinder continues to extend, the U-shaped plate and the L-shaped plate continue to move downward, and the roller slides in the straight groove. During this process, the punching head presses the circular tube downward, and the two supporting columns support the circular tube, so that the circular tube is bent in the middle, and the avoiding groove avoids the bent part of the circular tube;

[0022] S5. Then, the output end of the hydraulic cylinder contracts, driving the U-shaped plate and the L-shaped plate to move upward, pulling the steel wire rope, thereby driving the E-shaped plate to move leftward, so that the inserting teeth on both sides of the E-shaped plate lift the bottom of the bent circular tube upward, so that the bent part of the circular tube moves out of the avoiding groove. As the E-shaped plate continues to move leftward, the inserting teeth in the middle of the E-shaped plate continue to lift the circular tube upward.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a bending device and a bending method for the circular tube of the seat frame, having the following beneficial effects:

[0025] 1. The circular tube bending device and bending method for the seat frame drive the rotation of the rotating shaft through a motor, and with the transmission of the sprocket and chain, drive a row of rotating shafts to rotate synchronously, thereby driving the rotating arm to rotate, driving the feeding plate to move along a circular path, and during this process, the second clamp holds up the circular tube to be bent and moves it to the left, and places it on the first clamp, so that the circular tube to be bent is intermittently transferred to the left; thus achieving the purpose of maintaining the feeding rhythm and keeping the bending efficiency of the circular tube stable.

[0026] 2. The circular tube bending device and bending method for the seat frame, when the circular tube to be bent moves to directly above the avoidance groove, the motor stops driving the rotation of the rotating shaft, and then the output end of the hydraulic cylinder extends, driving the U-shaped plate and the L-shaped plate to move downward. During the sliding of the roller in the V-shaped groove, the vertical plate is driven to slide first into the arched frame and then out of the arched frame, and the circular tube to be bent is clamped from both sides by two inner baffles, and the circular tube to be bent is pushed to move, so that the middle part of the circular tube to be bent is directly below the punching head; thus achieving the purpose of automatically calibrating the position of the circular tube.

[0027] 3. The circular tube bending device and bending method for the seat frame, by the contraction of the output end of the hydraulic cylinder, drive the U-shaped plate and the L-shaped plate to move upward, pull the steel wire rope, thereby driving the E-shaped plate to move to the left, so that the insertion teeth on both sides of the E-shaped plate hold up the bottom of the bent circular tube upward, so that the bent part of the circular tube moves out of the avoidance groove. As the E-shaped plate continues to move to the left, the insertion teeth in the middle of the E-shaped plate continue to hold up the circular tube upward, so that the bent circular tube moves up a certain distance, facilitating the blanking. Description of the Drawings

[0028] Figure 1 It is a three-dimensional structural schematic diagram of a circular tube bending device for a seat frame proposed by the present invention;

[0029] Figure 2 It is a three-dimensional structural schematic diagram of the conveying line and feeding assembly of a circular tube bending device for a seat frame proposed by the present invention;

[0030] Figure 3 It is a three-dimensional structural schematic diagram of the feeding assembly of a circular tube bending device for a seat frame proposed by the present invention;

[0031] Figure 4 It is a three-dimensional structural schematic diagram at the processing table of a circular tube bending device for a seat frame proposed by the present invention;

[0032] Figure 5 It is a three-dimensional structural schematic diagram of the limiting assembly and extension plate of a circular tube bending device for a seat frame proposed by the present invention;

[0033] Figure 6 It is a three-dimensional structural schematic diagram of the transmission assembly of a circular tube bending device for a seat frame proposed by the present invention;

[0034] Figure 7 Schematic three-dimensional structure diagram of the arch frame and stamping assembly of a circular tube bending device for a seat frame proposed by the present invention;

[0035] Figure 8 Schematic three-dimensional structure diagram of the positioning assembly of a circular tube bending device for a seat frame proposed by the present invention;

[0036] Figure 9 Schematic three-dimensional structure diagram of the loosening assembly, processing table and arch frame of a circular tube bending device for a seat frame proposed by the present invention;

[0037] Figure 10 Schematic three-dimensional structure diagram of the loosening assembly of a circular tube bending device for a seat frame proposed by the present invention.

[0038] In the figure: 100, conveyor line; 200, processing table; 300, feeding assembly; 400, limiting assembly; 500, transmission assembly; 600, arch frame; 700, stamping assembly; 800, positioning assembly; 900, loosening assembly;

[0039] 101, support frame; 102, pallet; 103, clamping seat one; 201, extension plate; 202, boss; 203, guide groove; 204, avoidance groove; 205, sliding groove;

[0040] 301, rotating shaft; 302, rotating arm; 303, feeding plate; 304, clamping seat two; 305, sprocket; 306, chain; 307, motor;

[0041] 401, cushion block; 402, sliding column; 403, clamping plate; 404, supporting column; 405, connecting plate; 501, slide rail; 502, transverse moving seat; 503, sleeve; 504, inserting rod; 505, support; 506, gear; 507, rack plate one; 508, rack plate two;

[0042] 601, slot; 701, hydraulic cylinder; 702, stamping head; 801, vertical plate; 802, outer baffle; 803, inner baffle; 804, spring; 805, vertical groove; 806, V-shaped groove; 807, linear groove; 808, U-shaped plate; 809, L-shaped plate; 810, fixing plate; 811, roller;

[0043] 901, E-shaped plate; 902, slide bar; 903, tension spring; 904, steel wire rope; 905, guide tube. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Please refer to Figure 1 , a circular tube bending device for a seat frame, which includes two groups of conveying lines 100. There is a processing table 200 on the left side of the two groups of conveying lines 100. Feeding components 300 are arranged on the opposite sides of the two groups of conveying lines 100. A limiting component 400 is slidably connected to the processing table 200, and a transmission component 500 is arranged between the limiting component 400 and the feeding component 300; an arch-shaped frame 600 is fixedly installed on the top of the processing table 200, a stamping component 700 is arranged in the middle of the arch-shaped frame 600, positioning components 800 are arranged on the front and rear sides of the arch-shaped frame 600, and a loosening component 900 is arranged between the limiting component 400 and the processing table 200.

[0046] Please refer to Figure 2 , each group of conveying lines 100 includes a support frame 101. A support plate 102 is fixedly installed on the upper part of the side of the support frame 101. The cross-section of the support plate 102 is L-shaped. A first clamping seat 103 is arranged in an array on the horizontal part of the support plate 102. Each first clamping seat 103 is composed of two cushion strips, and the cross-section of the cushion strip is semi-circular. The two ends of the circular tube are supported by the two support plates 102, and the circular tube is limited by the two cushion strips to prevent the circular tube from rolling on the support plate 102.

[0047] Please refer to Figures 4 - 5 , an extension plate 201 is embedded in the middle of the processing table 200. The extension plate 201 extends between the left ends of the two support plates 102 and is between the two groups of feeding components 300. A convex platform 202 is fixedly installed on the top of the right end of the extension plate 201. Two guiding grooves 203 are penetrated through the extension plate 201. The two guiding grooves 203 are distributed front and back. An avoidance groove 204 is penetrated through the left half of the extension plate 201. The avoidance groove 204 is located between the two guiding grooves 203. Two sliding grooves 205 are opened on the top of the extension plate 201. The two sliding grooves 205 are located between the two guiding grooves 203, and the sliding grooves 205 penetrate through the avoidance groove 204.

[0048] Please refer to Figures 2 - 3, each feeding component 300 includes a row of rotating shafts 301 rotatably connected below the pallet 102. The rotating shafts 301 are arranged in an array along the length direction of the pallet 102. One end of the rotating shaft 301 is fixedly installed with a rotating arm 302. The end of the rotating arm 302 away from the rotating shaft 301 is hinged with a feeding plate 303. The cross-section of the feeding plate 303 is in an inverted L shape, and a row of rotating arms 302 are hinged on the vertical part of the same feeding plate 303. Card seats two 304 are arranged in an array on the top of the feeding plate 303. The array pitch of the card seats two 304 is equal to the array pitch of the card seats one 103. Each card seat two 304 is composed of two cushion columns, and the cross-section of the cushion column is in a semicircular shape; the other end of the rotating shaft 301 is fixedly installed with a sprocket 305. The sprockets 305 are connected by a chain 306, and the leftmost rotating shaft 301 is fixedly installed with a motor 307.

[0049] Please refer to Figure 5 , the limiting component 400 includes two cushion blocks 401. The cushion blocks 401 are attached to the top of the extension plate 201. The two cushion blocks 401 are distributed front and back. A sliding column 402 is fixedly installed at the bottom of each cushion block 401. The sliding column 402 is slidably connected through the guiding groove 203. A connecting plate 405 is fixedly installed between the bottom ends of the two sliding columns 402. Thus, the cushion blocks 401 and the connecting plate 405 clamp the upper and lower sides of the extension plate 201.

[0050] Two clamping plates 403 are fixedly installed on the top of the two cushion blocks 401. The two clamping plates 403 are distributed left and right. The upper half of the clamping plate 403 is inclined, and the upper halves of the two clamping plates 403 are inclined towards the opposite sides. A supporting column 404 is rotatably connected between the front and rear ends of the two clamping plates 403; by the sliding column 402 reciprocating left and right along the guiding groove 203, the cushion blocks 401 and the clamping plates 403 are driven to reciprocate left and right. When the two clamping plates 403 move to the rightmost side, the round tube is transferred between the two clamping plates 403 through the feeding plate 303.

[0051] Please refer to Figure 6 , the transmission component 500 includes a slide rail 501. A transverse moving seat 502 is slidably connected in the slide rail 501. Four groups of sleeves 503 are fixedly installed on the top of the transverse moving seat 502. A plug rod 504 is slidably connected to the top end of the sleeve 503. The four groups of plug rods 504 are respectively fixed to the bottom of the two feeding plates 303. Thus, when the rotating shaft 301 rotates, the rotating arm 302 drives the feeding plate 303 to move along a circular path. During this process, the feeding plate 303 drives the plug rod 504 to reciprocate up and down relative to the sleeve 503. At the same time, the transverse moving seat 502 is driven to reciprocate left and right relative to the slide rail 501.

[0052] At the left end of the slide rail 501, there is a support 505. A gear 506 is rotatably connected to the support 505. A first rack plate 507 is fixedly installed at the top of the transverse movement seat 502. The first rack plate 507 meshes with the bottom of the gear 506. A second rack plate 508 is fixedly installed at the bottom of the connecting plate 405. The second rack plate 508 meshes with the top of the gear 506. Through the transmission of the second rack plate 508, the first rack plate 507 and the gear 506, when the transverse movement seat 502 reciprocates left and right, it drives the connecting plate 405 to reciprocate left and right, and the moving directions of the transverse movement seat 502 and the connecting plate 405 are opposite. Therefore, when the feeding plate 303 moves from right to left along the annular path, the two clamping plates 403 move from left to right.

[0053] Please refer to Figure 7 , the stamping assembly 700 includes a hydraulic cylinder 701 fixedly installed at the center of the top of the arched frame 600. The output end of the hydraulic cylinder 701 penetrates through the arched frame 600. A stamping head 702 is fixedly installed at the bottom of the output end of the hydraulic cylinder 701. The stamping head 702 is located directly above the avoidance groove 204. The left view of the stamping head 702 is an isosceles right triangle, and the bottom is in an arc transition. Embedding grooves are arranged on both side surfaces of the stamping head 702, and the cross-section of the embedding groove is semi-circular. The thickness of the stamping head 702 is equal to the distance between the lower halves of the two clamping plates 403. The lower halves of the two clamping plates 403 are used for clamping the round tube.

[0054] Please refer to Figures 8 - 9 , through slots 601 are respectively formed through the left and right sides of the arched frame 600. The positioning assembly 800 includes a vertical plate 801 inserted into the through slots 601. The vertical plate 801 can move left and right relative to the arched frame 600. An outer baffle 802 is fixedly installed at one end of the vertical plate 801 located outside the arched frame 600. An inner baffle 803 is fixedly installed at one end of the vertical plate 801 located inside the arched frame 600. A spring 804 is fixedly installed between the outer baffle 802 and the arched frame 600. Due to the elasticity of the spring 804, the outer baffle 802 has a tendency to move away from the arched frame 600.

[0055] Two vertical slots 805 are formed through the inner baffle 803. A V-shaped slot 806 is formed through the upper half of the vertical plate 801. The V-shaped slot 806 is V-shaped, and the tip points towards the vertical part of the arched frame 600. A linear slot 807 is formed through the lower half of the vertical plate 801. The linear slot 807 is linear. The bottom end of the V-shaped slot 806 is communicated with the top end of the linear slot 807.

[0056] The positioning assembly 800 further includes a U-shaped plate 808 slidably connected through the middle of the arched frame 600. The middle of the U-shaped plate 808 is fixedly installed on the bottom output end of the hydraulic cylinder 701. L-shaped plates 809 are fixedly installed at both ends of the U-shaped plate 808. The L-shaped plates 809 are L-shaped in reverse. The vertical parts of the L-shaped plates 809 are slidably connected through the arched frame 600. The bottom ends of the L-shaped plates 809 are higher than the bottom of the U-shaped plate 808.

[0057] At the bottom end of each L-shaped plate 809, two fixing plates 810 are fixedly installed. The two fixing plates 810 are respectively slidably connected in the vertical slots 805. A roller 811 is fixedly installed between the two fixing plates 810. The roller 811 is slidably connected in the V-shaped slot 806 and the linear slot 807.

[0058] Please refer to Figures 9 - 10 , the loosening assembly 900 includes an E-shaped plate 901. The height of the E-shaped plate 901 is equal to the height of the cushion block 401. The E-shaped plate 901 has three inserted teeth. The top view of the E-shaped plate 901 is in the shape of an E. An inclined surface is provided at the top of each inserted tooth. The length of the middle inserted tooth is less than the lengths of the inserted teeth on both sides. Slide bars 902 are fixedly installed at the bottoms of the inserted teeth on both sides. The two slide bars 902 are respectively slidably connected in the two chute grooves 205. A tension spring 903 is fixedly installed on the right side of the E-shaped plate 901. One end of the tension spring 903 away from the E-shaped plate 901 is fixedly installed on the boss 202. Due to the pulling force of the tension spring 903, the E-shaped plate 901 has a tendency to move to the right.

[0059] Steel wire ropes 904 are fixedly installed at the left ends of the two slide bars 902. Threading holes are provided in the extension plate 201 and the processing table 200. The steel wire ropes 904 pass through the threading holes. Two guide pipes 905 are fixedly installed at the top of the arch-shaped frame 600. Bell mouths are provided at both ends of the guide pipes 905. The steel wire ropes 904 penetrate and are slidably connected to the horizontal part of the arch-shaped frame 600. The steel wire ropes 904 pass through the guide pipes 905, and the top ends of the steel wire ropes 904 are fixedly installed on the horizontal part of the L-shaped plate 809.

[0060] When in use, the bending method of the seat frame round tube bending device is as follows:

[0061] S1. Drive the rotating shaft 301 to rotate through the motor 307. With the transmission of the sprocket 305 and the chain 306, drive a row of rotating shafts 301 to rotate synchronously, thereby driving the rotating arm 302 to rotate, driving the feeding plate 303 to move along a circular path, and during this process, the second clamping seat 304 lifts the round tube to be bent upward and moves it to the left, and places it on the first clamping seat 103, so that the round tube to be bent is intermittently transferred to the left;

[0062] S2. When the feeding plate 303 moves along a circular path, the inserting rod 504 moves up and down relative to the sleeve 503, driving the sleeve 503 and the transverse moving seat 502 to move reciprocally left and right. Then, through the transmission of the first rack plate 507, the gear 506 and the second rack plate 508, the connecting plate 405 is driven to move reciprocally left and right. Moreover, the moving direction of the connecting plate 405 is opposite to that of the transverse moving seat 502. Through the connection of the sliding column 402, the cushion block 401 and the clamping plate 403 move synchronously with the connecting plate 405. When the cushion block 401 and the clamping plate 403 move to the rightmost side of their stroke, the feeding plate 303 transfers the round tube to be bent between the two clamping plates 403, and the two supporting columns 404 lift the round tube to be bent;

[0063] S3. When the sliding column 402 moves leftward along the guiding groove 203, driving the round tube to be bent to move leftward synchronously. When the round tube to be bent moves right above the avoiding groove 204, the motor 307 stops driving the rotating shaft 301 to rotate. Then, the output end of the hydraulic cylinder 701 extends, driving the U-shaped plate 808 and the L-shaped plate 809 to move downward. During the sliding of the roller 811 in the V-shaped groove 806, the vertical plate 801 is driven to slide into the arched frame 600 first and then slide out of the arched frame 600. The two inner baffles 803 clamp the round tube to be bent from both sides, pushing the round tube to be bent to move, so that the middle part of the round tube to be bent is right below the punching head 702;

[0064] S4. The output end of the hydraulic cylinder 701 continues to extend, and the U-shaped plate 808 and the L-shaped plate 809 continue to move downward. The roller 811 slides in the linear groove 807. During this process, the punching head 702 squeezes the round tube downward, and the two supporting columns 404 support the round tube, so that the round tube is bent in the middle, and the avoiding groove 204 avoids the bent part of the round tube;

[0065] S5. Then, the output end of the hydraulic cylinder 701 contracts, driving the U-shaped plate 808 and the L-shaped plate 809 to move upward, pulling the steel wire rope 904, thereby driving the E-shaped plate 901 to move leftward. Thus, the inserting teeth on both sides of the E-shaped plate 901 lift the bottom of the bent round tube upward, so that the bent part of the round tube moves out of the avoiding groove 204. As the E-shaped plate 901 continues to move leftward, the inserting teeth in the middle of the E-shaped plate 901 continue to lift the round tube upward.

[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circular tube bending device for a seat frame, comprising two sets of conveying lines (100), characterized in that: There is a processing table (200) arranged on the left side of the two groups of the conveying lines (100). Feeding assemblies (300) are arranged on the opposite sides of the two groups of the conveying lines (100). A limiting assembly (400) is slidably connected to the processing table (200), and a transmission assembly (500) is arranged between the limiting assembly (400) and the feeding assembly (300); An arched frame (600) is fixedly installed on the top of the processing table (200). A stamping assembly (700) is arranged in the middle of the arched frame (600). Positioning assemblies (800) are arranged on the front and rear sides of the arched frame (600). A loosening assembly (900) is arranged between the limiting assembly (400) and the processing table (200); Insertion slots (601) are respectively formed through the left and right sides of the arched frame (600); The positioning assembly (800) includes a vertical plate (801) inserted into the insertion slot (601). An outer baffle (802) is fixedly installed at one end of the vertical plate (801) located outside the arched frame (600). An inner baffle (803) is fixedly installed at one end of the vertical plate (801) located inside the arched frame (600). A spring (804) is fixedly installed between the outer baffle (802) and the arched frame (600). Two vertical slots (805) are formed through the inner baffle (803). A V-shaped slot (806) is formed through the upper half of the vertical plate (801). A linear slot (807) is formed through the lower half of the vertical plate (801). The bottom end of the V-shaped slot (806) is communicated with the top end of the linear slot (807); The positioning assembly (800) further includes a U-shaped plate (808) slidably connected through the middle of the arched frame (600). The middle of the U-shaped plate (808) is fixedly installed on the bottom output end of a hydraulic cylinder (701). L-shaped plates (809) are fixedly installed at both ends of the U-shaped plate (808). The L-shaped plates (809) are in an inverted L shape. The vertical parts of the L-shaped plates (809) are slidably connected to the arched frame (600). Two fixing plates (810) are fixedly installed at the bottom end of each L-shaped plate (809). The two fixing plates (810) are respectively slidably connected in the vertical slots (805). A roller (811) is fixedly installed between the two fixing plates (810). The roller (811) is slidably connected in the V-shaped slot (806) and the linear slot (807).

2. The seat frame round tube bending device according to claim 1, wherein: Each group of the conveying lines (100) includes a support frame (101). A support plate (102) is fixedly installed on the upper part of the side surface of the support frame (101). The cross section of the support plate (102) is in an L shape. Clamping seats one (103) are arranged in an array on the horizontal part of the support plate (102). Each clamping seat one (103) is composed of two cushion strips, and the cross section of the cushion strip is in a semi-circular shape.

3. The seat frame round tube bending device according to claim 2, characterized in that: The middle part of the processing table (200) is embedded with an extension plate (201), the extension plate (201) extends between the left ends of the two supporting plates (102), a boss (202) is fixedly installed at the top of the right end of the extension plate (201), two guiding grooves (203) are penetrated and opened on the extension plate (201), the two guiding grooves (203) are distributed front and back, an avoidance groove (204) is penetrated and opened on the left half of the extension plate (201), the avoidance groove (204) is located between the two guiding grooves (203), and two sliding grooves (205) are opened at the top of the extension plate (201), the two sliding grooves (205) are located between the two guiding grooves (203), and the sliding groove (205) penetrates the avoidance groove (204).

4. The seat frame round tube bending device according to claim 3, characterized in that: Each feeding assembly (300) includes a row of rotating shafts (301) rotatably connected below the supporting plate (102), a rotating arm (302) is fixedly installed at one end of the rotating shaft (301), a feeding plate (303) is hinged at the end of the rotating arm (302) away from the rotating shaft (301), the cross section of the feeding plate (303) is in an inverted L shape, a second clamping seat (304) is arranged in an array on the top of the feeding plate (303), and each second clamping seat (304) is composed of two cushion columns, and the cross section of the cushion column is semi-circular; A sprocket (305) is fixedly installed at the other end of the rotating shaft (301), the sprockets (305) are connected by a chain (306), and a motor (307) is fixedly installed on the leftmost rotating shaft (301).

5. The seat frame round tube bending device according to claim 4, characterized in that: The limiting assembly (400) includes two cushion blocks (401), the two cushion blocks (401) are distributed front and back, a sliding column (402) is fixedly installed at the bottom of each cushion block (401), two clamping plates (403) are fixedly installed at the top of the two cushion blocks (401), the two clamping plates (403) are distributed left and right, the upper half of the clamping plate (403) is inclined, and the upper halves of the two clamping plates (403) are inclined towards the opposite sides, and a supporting column (404) is rotatably connected between the front and rear ends of the two clamping plates (403); The sliding column (402) is slidably connected through the guiding groove (203), and a connecting plate (405) is fixedly installed between the bottom ends of the two sliding columns (402).

6. The seat frame round tube bending device according to claim 5, characterized in that: The transmission assembly (500) includes a slide rail (501), a transverse moving seat (502) is slidably connected in the slide rail (501), four groups of sleeves (503) are fixedly installed at the top of the transverse moving seat (502), a plug rod (504) is slidably connected to the top end of the sleeve (503), and the four groups of plug rods (504) are respectively fixed at the bottom of the two feeding plates (303); A support (505) is provided at the left end of the slide rail (501). A gear (506) is rotatably connected to the support (505). A first rack plate (507) is fixedly installed at the top of the transverse movement base (502). The first rack plate (507) meshes with the bottom of the gear (506). A second rack plate (508) is fixedly installed at the bottom of the connecting plate (405). The second rack plate (508) meshes with the top of the gear (506).

7. The seat frame round tube bending device according to claim 6, characterized in that: The stamping assembly (700) includes a hydraulic cylinder (701) fixedly installed at the center of the top of the arched frame (600). The output end of the hydraulic cylinder (701) penetrates through the arched frame (600). A stamping head (702) is fixedly installed at the bottom of the output end of the hydraulic cylinder (701). The stamping head (702) is located directly above the avoidance groove (204). The left view of the stamping head (702) is an isosceles right triangle, and the bottom is in an arc transition. Embedding grooves are provided on both side surfaces of the stamping head (702), and the cross-section of the embedding groove is semi-circular.

8. The seat frame round tube bending device according to claim 7, characterized in that: The loosening assembly (900) includes an E-shaped plate (901). The height of the E-shaped plate (901) is equal to the height of the cushion block (401). The E-shaped plate (901) has three inserted teeth. The top view of the E-shaped plate (901) is in the shape of the letter 'E'. An inclined surface is provided at the top of each inserted tooth. The length of the middle inserted tooth is less than the lengths of the inserted teeth on both sides. Sliding bars (902) are fixedly installed at the bottoms of the inserted teeth on both sides. The two sliding bars (902) are respectively slidably connected in the two sliding grooves (205). A tension spring (903) is fixedly installed on the right side of the E-shaped plate (901). One end of the tension spring (903) away from the E-shaped plate (901) is fixedly installed on the boss (202). Steel wires (904) are fixedly installed at the left ends of the two sliding bars (902). Threading holes are provided in the extension plate (201) and the processing table (200). The steel wires (904) pass through the threading holes. Two guide pipes (905) are fixedly installed at the top of the arched frame (600). The steel wires (904) are slidably connected through the horizontal part of the arched frame (600). The steel wires (904) pass through the guide pipes (905), and the top ends of the steel wires (904) are fixedly installed on the horizontal part of the L-shaped plate (809).

9. The seat frame round tube bending device according to claim 8, characterized in that, The bending method of the seat frame round tube bending device is as follows: S1. Drive the rotating shaft (301) to rotate through the motor (307). With the transmission of the sprocket (305) and the chain (306), drive a row of rotating shafts (301) to rotate synchronously, thereby driving the rotating arm (302) to rotate, driving the feeding plate (303) to move along a circular path. During this process, the second clamping seat (304) lifts the round tube to be bent upwards and moves it to the left, and places it on the first clamping seat (103), so that the round tube to be bent is intermittently transferred to the left. S2. When the feeding plate (303) moves along a circular path, the inserting rod (504) moves up and down relative to the sleeve (503), driving the sleeve (503) and the transverse moving seat (502) to reciprocate left and right. Then, through the transmission of the first rack plate (507), the gear (506) and the second rack plate (508), the connecting plate (405) is driven to reciprocate left and right, and the moving direction of the connecting plate (405) is opposite to that of the transverse moving seat (502). Through the connection of the sliding column (402), the cushion block (401) and the clamping plate (403) move synchronously with the connecting plate (405). When the cushion block (401) and the clamping plate (403) move to the rightmost side of their strokes, the feeding plate (303) transfers the round tube to be bent between the two clamping plates (403), and the two supporting columns (404) lift the round tube to be bent. S3. When the sliding column (402) moves leftward along the guiding groove (203), driving the round tube to be bent to move leftward synchronously. When the round tube to be bent moves directly above the avoiding groove (204), the motor (307) stops driving the rotating shaft (301) to rotate. Then, the output end of the hydraulic cylinder (701) extends, driving the U-shaped plate (808) and the L-shaped plate (809) to move downward. During the sliding of the roller (811) in the V-shaped groove (806), the vertical plate (801) is driven to slide first into the arch-shaped frame (600) and then out of the arch-shaped frame (600). The two inner baffle plates (803) clamp the round tube to be bent from both sides and push the round tube to be bent, so that the middle part of the round tube to be bent is directly below the punching head (702). S4. The output end of the hydraulic cylinder (701) continues to extend, and the U-shaped plate (808) and the L-shaped plate (809) continue to move downward. The roller (811) slides in the linear groove (807). During this process, the punching head (702) squeezes the round tube downward, and the two supporting columns (404) support the round tube, so that the round tube is bent in the middle, and the avoiding groove (204) avoids the bent part of the round tube. S5. Then, the output end of the hydraulic cylinder (701) contracts, driving the U-shaped plate (808) and the L-shaped plate (809) to move upward, pulling the steel wire rope (904), thereby driving the E-shaped plate (901) to move leftward. Thus, the inserting teeth on both sides of the E-shaped plate (901) lift the bottom of the bent round tube upward, so that the bent part of the round tube moves out of the avoiding groove (204). As the E-shaped plate (901) continues to move leftward, the inserting teeth in the middle of the E-shaped plate (901) continue to lift the round tube upward.

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