Straightening and pressing process suitable for micro-channel flat aluminum pipe machining

Abstract

The invention discloses a straightening and pressing technology suitable for micro-channel flat aluminum pipe machining, and belongs to the technical field of micro-channel flat aluminum pipe machining. According to the scheme, a plurality of inner supporting assemblies matched with a pair of straightening roller sets are additionally arranged, the inner supporting assemblies are matched with square hole channels in an aluminum flat pipe, and in the horizontal moving, rolling and straightening process of the aluminum flat pipe, the inner supporting assemblies are matched with the square hole channels in the aluminum flat pipe; the square hole channel of the aluminum flat pipe penetrates through the inner supporting assembly, the inner supporting assembly plays a role in supporting the interior of the square hole channel, inward concave deformation of the internal structure of the aluminum flat pipe in the straightening process is effectively relieved, in addition, in the one-time reciprocating straightening process, straightening force of the straightening roller and the inner supporting assembly on the inner end face and the outer end face of the aluminum flat pipe is gradually applied, and the straightening effect is good. The aluminum flat pipe is slowly straightened to meet the straight line requirement, and the situation that the aluminum flat pipe is deformed due to the fact that straightening force is too large in the one-time straightening process or the good straightening effect on the aluminum flat pipe cannot be achieved due to the fact that straightening force is too small is effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of micro-channel flat aluminum tube processing, and more specifically to a straightening and pressing process suitable for micro-channel flat aluminum tube processing. Background Art

[0002] Microchannel aluminum flat tube is a thin-walled porous flat tubular material made of refined aluminum rods through hot extrusion and surface zinc spraying for corrosion protection. It is mainly used in air-conditioning systems of various refrigerants. As a pipeline component that carries new environmentally friendly refrigerants, it is a key material for the new generation of parallel flow microchannel air-conditioning heat exchangers.

[0003] Microchannel aluminum flat tubes are prone to bending and deformation during the production process. The straightening of the aluminum flat tubes is very important to ensure the quality, thermal conductivity, mechanical strength and reliability of the aluminum flat tubes. Through the correct straightening process, the performance and application effect of the aluminum flat tubes can be improved.

[0004] In the prior art, most straightening rollers are symmetrically arranged up and down for one-time roller straightening. The straightening force of the straightening rollers on the aluminum flat tube is fixed. For the same aluminum flat tube, different bending deformation degrees often occur at different positions. If one-time straightening is used, the aluminum flat tube may be cracked or broken due to the inappropriate straightening force and bending degree.

[0005] Secondly, since the internal structure of the aluminum flat tube is a square hole channel arranged in parallel, inward deformation may occur during the production process. In the straightening process, it is also easy for the internal structure of the aluminum flat tube to deform inward due to improper straightening force, causing damage to the aluminum flat tube, and thus resulting in unqualified aluminum flat tube.

[0006] To this end, we proposed a straightening and pressing process suitable for microchannel flat aluminum tube processing to address the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the existing practical problems. Compared with the existing technology, it provides a straightening and pressing process suitable for the processing of microchannel flat aluminum tubes. It is achieved by adding a plurality of internal support components that cooperate with a pair of straightening roller groups. The internal support components are adapted to the square hole channel in the aluminum flat tube. In the process of horizontal moving roller straightening of the aluminum flat tube, the square hole channel of the aluminum flat tube passes through the internal support components. The internal support components play a supporting role on the inside of the square hole channel, which effectively alleviates the inward concave deformation of the internal structure of the aluminum flat tube during the correction process. In addition, in a reciprocating straightening process, the straightening rollers and the internal support components are gradually applied to the straightening force of the inner and outer end faces of the aluminum flat tube, so as to achieve slow straightening of the aluminum flat tube to meet the straight line requirements, effectively preventing the aluminum flat tube from being deformed due to excessive straightening force during a straightening process, or failing to achieve a good straightening effect on the aluminum flat tube due to too small straightening.

[0008] The purpose of the present invention can be achieved by the following technical solution: A straightening and pressing process suitable for processing microchannel flat aluminum tubes comprises the following steps:

[0009] Step 1: Straightening and adjustment processing, first place the aluminum flat tube on the loading table of the operating table, adjust the roller pressing distance between the upper and lower pairs of straightening rollers on the two sets of straightening rollers, and use the adjustment component to adjust the straightening height of multiple inner support components fixed by a pair of positioning mechanisms according to the height of the square hole channel of the aluminum flat tube;

[0010] Step 2: a straightening and rolling process, using the first pushing mechanism to push the aluminum flat tube from left to right, when the square hole channel on the aluminum flat tube passes through multiple inner support components, the two groups of straightening rollers arranged on the left and right perform straightening and rolling on the upper and lower end surfaces of the aluminum flat tube until the aluminum flat tube is completely separated from the inner support component, completing a rolling process, during the horizontal pushing process of the aluminum flat tube, the positioning mechanisms on the left and right sides always keep one of them to limit the inner support component;

[0011] Step 3: Reverse secondary straightening roller processing, readjust the rolling distance between the upper and lower pairs of straightening rollers and the straightening height of the inner support assembly, appropriately increase the rolling pressure on the inner and outer end surfaces of the aluminum flat tube, and use the second pushing mechanism to push the aluminum flat tube in the reverse direction. During the reverse pushing process, one of the positioning structures is always kept to fix the end of the inner support assembly, and the aluminum flat tube completes the secondary straightening.

[0012] Furthermore, the straightening roller group includes a pair of brackets fixed to the upper end of the operating table and distributed on the left and right, a pair of lifting seats arranged up and down are installed between the pair of brackets for lifting, and a pair of straightening rollers distributed horizontally are installed on the opposite inner end walls of the pair of lifting seats.

[0013] Furthermore, the first pushing mechanism includes an electric guide rail 1 fixed on the operating table and located between a pair of brackets, and a horizontally movable left push plate is installed on the pair of electric guide rails 1 through a bracket 1. The second pushing mechanism includes an electric guide rail 2 also fixed on the operating table and located between a pair of brackets, and a horizontally movable right push plate is installed on the pair of electric guide rails 2 through a bracket 2.

[0014] Furthermore, the inner support component includes a fixed rod and a magnetic movable sleeve slidably installed on the upper and lower ends thereof, the left and right ends of the fixed rod are fixedly connected with magnetic positioning rods adapted to the positioning structure, the upper and lower end walls of the fixed rod are embedded with two magnetic sheets from the inside to the outside, and a pair of the magnetic movable sleeves are embedded and installed at one end thereof which is opposite to each other with magnetic strips that are magnetically attracted to the magnetic sheets.

[0015] Furthermore, the positioning structure includes a slide fixed on the operating table, on which a clamping seat is slidably installed through an electric push cylinder, and the clamping seat is provided with a hole with the same thickness as the magnetic positioning rod and an open end, and an electromagnetic sheet for magnetically positioning the magnetic positioning rod is embedded inside.

[0016] Furthermore, a pair of the clamping seats are horizontally distributed outside the two groups of straightening rollers, and the adjustment components are distributed in the middle of the two groups of straightening rollers.

[0017] Furthermore, the adjustment component includes a U-shaped frame fixed on the operating table, and electric push rods are fixedly embedded and installed at the upper and lower ends of the U-shaped frame. A pair of electric push rod driving ends penetrate the inner wall of the U-shaped frame and are fixedly connected to an electromagnetic plate located on the outside of the inner support component.

[0018] Optionally, the upper and lower end walls of the plurality of magnetic movable sleeves are embedded with magnetic blocks matching the electromagnetic plates.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) This scheme is to add multiple internal support components that cooperate with a pair of straightening roller groups. The internal support components are compatible with the square hole channel in the aluminum flat tube. During the horizontal roller straightening process of the aluminum flat tube, the square hole channel of the aluminum flat tube passes through the internal support components. The internal support components play a supporting role on the inside of the square hole channel, effectively alleviating the inward deformation of the internal structure of the aluminum flat tube during the straightening process. In addition, during a reciprocating straightening process, the straightening rollers and the internal support components gradually apply straightening force to the inner and outer end faces of the aluminum flat tube, so that the aluminum flat tube is slowly straightened to meet the straight line requirements, effectively preventing the aluminum flat tube from being deformed due to excessive straightening force during a straightening process, or failing to achieve the straightening effect on the aluminum flat tube due to too small straightening force.

[0021] (2) The inner support assembly in this scheme is composed of a fixed rod and a magnetic movable sleeve slidably installed on the upper and lower ends of the fixed rod. The upper and lower ends of the fixed rod are embedded with two magnetic sheets distributed inside and outside. During the initial adjustment, the magnetic strip on the magnetic movable sleeve is magnetically connected with the magnetic sheet on the inner side through the electromagnetic plate on the adjustment assembly, and the distance between the pair of magnetic movable sleeves is reduced. The distance between the two is slightly smaller than the height of the square hole channel, so that when the square hole channel extends into the inner support assembly, it can play a preliminary straightening role on the concave part. During the second adjustment, the electromagnetic plate drives the magnetic movable sleeve to move outward until the magnetic strip on the magnetic movable sleeve is magnetically connected with the magnetic sheet on the outer side, thereby increasing the distance between the pair of magnetic movable sleeves. Therefore, when the square hole channel passes through the pair of magnetic movable sleeves, the contact and extrusion pressure of the pair of magnetic movable sleeves on the upper and lower inner walls of the square hole channel is increased. Compared with the first straightening, the straightening force of the magnetic movable sleeve on the inner wall of the aluminum flat tube is increased during the second straightening process, and the straightening roller that increases the force simultaneously is used to improve the straightening linear accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a process flow chart of the present invention;

[0023] Figure 2 A top view of the processing device of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the combination of the first pushing mechanism, the second pushing mechanism and the two groups of straightening rollers of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the aluminum flat tube of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a pair of positioning structures of the present invention positioning multiple inner support components;

[0027] Figure 6 It is a structural schematic diagram of the junction between the inner support assembly and a pair of positioning structures and the adjustment assembly of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the inner support assembly of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the inner support assembly when one of the magnetic movable sleeves is detached upwards according to the present invention;

[0030] Fig. 9 is a side cross-sectional view of the inner support assembly of the present invention;

[0031] Fig.10 It is a structural schematic diagram of the present invention when the first pushing mechanism is used to push the aluminum flat tube toward the head end straightening roller;

[0032] Fig.11 It is a partial structural schematic diagram of the present invention in which the aluminum flat tube is pushed between two sets of straightening rollers by using the first pushing mechanism;

[0033] Fig.12 This is a top view of the present invention when the first pushing mechanism is used to push the aluminum flat tube between two sets of straightening rollers;

[0034] Fig.13 It is a structural schematic diagram of the present invention when the first pushing mechanism is used to push the head end of the aluminum flat tube out of the inner support assembly;

[0035] Fig.14 It is a structural schematic diagram of the present invention when the first pushing mechanism is used to completely push the aluminum flat tube out of the inner support assembly;

[0036] Fig.15It is a schematic structural diagram of the present invention when the second pushing mechanism is used to push the aluminum flat tube in reverse direction.

[0037] Description of the numbers in the figure:

[0038] 1. Operating table; 2. Aluminum flat tube; 201. Square hole channel; 3. Bracket; 4. Lifting seat; 5. Straightening roller; 6. Electric guide rail 1; 7. Left push plate; 8. Electric guide rail 2; 9. Right push plate; 10. Slide; 11. Electric push cylinder; 12. Clamping seat; 13. Inner support assembly; 131. Fixed rod; 132. Magnetic movable sleeve; 133. Magnetic positioning rod; 134. Magnetic sheet; 135. Magnetic strip; 136. Magnetic block; 14. Adjustment assembly; 141. U-shaped frame; 142. Electric push rod; 143. Electromagnetic plate. DETAILED DESCRIPTION

[0039] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0040] Example 1: The present invention discloses a straightening and pressing process suitable for processing microchannel flat aluminum tubes, mainly for straightening of larger-sized aluminum flat tubes. Figure 1 , including the following steps:

[0041] Step 1: Please refer to Figure 2 First, the aluminum flat tube 2 to be straightened is placed on the loading platform of the operating table 1, and the roller pressing distance between the upper and lower pairs of straightening rollers 5 on the two groups of straightening rollers is adjusted. According to the height of the square hole channel 201 of the aluminum flat tube 2, the straightening height of the multiple inner support components 13 fixed by a pair of positioning mechanisms is adjusted by using the adjustment component 14;

[0042] During the initial adjustment, the straightening height of the inner support assembly 13 is slightly smaller than the inner height of the square hole channel 201, reducing the squeezing force of the inner support assembly 13 on the inner wall of the square hole channel 201, which is suitable for preliminary correction of the partially inwardly concave deformation portion;

[0043] Step 2: Please refer to Fig.10 , Fig.11 , the aluminum flat tube 2 is pushed from left to right by the first pushing mechanism. When the front end of the aluminum flat tube 2 is close to the head end of the inner support assembly 13, the limiting state of the end of the inner support assembly 13 by the positioning structure there is released, and the multiple square hole channels 201 on the aluminum flat tube 2 pass through the multiple inner support assemblies 13 arranged between the two groups of straightening rollers, and the inner support assembly 13 supports the inside of the square hole channels 201;

[0044] See also Figure 11-Figure 14 When the rear end of the aluminum flat tube 2 completely passes through the head end of the inner support assembly 13 and the front end of the aluminum flat tube 2 is close to the end of the inner support assembly 13, the left positioning mechanism is used to reposition the head end of the inner support assembly 13, and then the right positioning mechanism is released from the limiting state of the end of the inner support assembly 13, so that the aluminum flat tube 2 continues to move to the left until it is completely separated from the inner support assembly 13. During the horizontal pushing process of the aluminum flat tube 2, the two groups of straightening rollers arranged on the left and right perform straightening roller pressing on the upper and lower end surfaces of the aluminum flat tube 2;

[0045] Step 3: Please refer to Fig.14 , Fig.15 After the aluminum flat tube 2 is pushed away from the inner support assembly 13 by the first pushing mechanism, it is pushed in the opposite direction by the second pushing mechanism. During the reverse pushing process, the rolling distance between the upper and lower pairs of straightening rollers 5 on the two groups of straightening roller groups is readjusted, and the rolling pressure on the end face of the aluminum flat tube 2 is appropriately increased. The straightening height of multiple inner support assemblies 13 is reset by the adjusting assembly 14. During the secondary adjustment, the straightening height of the inner support assembly 13 is kept consistent with the height inside the square hole channel 201. In the process, one of the positioning structures is always kept to fix the end of the inner support assembly 13. After the reciprocating motion, the aluminum flat tube 2 completes the straightening.

[0046] See also Figure 2-Figure 3 The straightening roller group includes a pair of brackets 3 fixed to the upper end of the operating table 1 and distributed on the left and right sides. A pair of lifting seats 4 arranged up and down are installed between the pair of brackets 3 for lifting and lowering. A pair of straightening rollers 5 distributed horizontally are installed on the opposite inner side end walls of the pair of lifting seats 4. The pair of straightening rollers 5 installed on the lifting seats 4 are connected by a linkage structure for transmission. The upper and lower pairs of lifting seats 4 can be lifted and lowered separately, or the pair of lifting seats 4 can be synchronously moved in the same and opposite directions by the cooperation between the motor and the bidirectional screw. The specific driving structure can be set according to actual needs;

[0047] During the conveying process of the aluminum flat tube 2, the straightening roller 5 is in a rotating state, and the loading platform is connected to the end of the inner support assembly 13. It can adopt a liftable platform. The height of the loading platform can be adjusted according to the height of the aluminum flat tube 2 to be processed, so that the rolling distance of a pair of straightening rollers 5 can be adjusted according to the height of the aluminum flat tube 2. The rolling distance is gradually reduced twice, that is, the rolling pressure of the pair of straightening rollers 5 on the end face of the aluminum flat tube 2 is appropriately increased in the second round of rolling.

[0048] See also Figure 3The first pushing mechanism includes an electric guide rail 1 6 fixed on the operating table 1 and located between a pair of brackets 3, and a left pushing plate 7 for horizontal movement is installed on the pair of electric guide rails 1 6 through a bracket 1. The second pushing mechanism includes an electric guide rail 2 8 also fixed on the operating table 1 and located between the pair of brackets 3, and a right pushing plate 9 for horizontal movement is installed on the pair of electric guide rails 2 8 through a bracket 2. The pair of electric guide rails 2 8 are located outside the pair of electric guide rails 1 6, and the inner and outer staggered connecting parts of the electric guide rails 2 8 and the electric guide rails 1 6 are arranged at two groups of straightening roller groups. The structures of the left pushing plate 7 and the right pushing plate 9 are consistent, and the heights of both are less than the thickness of the aluminum flat tube 2. The left pushing plate 7 and the right pushing plate 9 are provided with engaging grooves that engage with the ends of the aluminum flat tube 2.

[0049] By adjusting the length of the bracket 1 so that the distance between the pair of left push plates 7 is just matched with the width of the aluminum flat tube 2, the aluminum flat tube 2 to be straightened is placed on the loading table of the operating table 1, and then the electric guide rail 1 6 is started. The electric guide rail 1 6 drives the left push plate 7 to move toward the end of the aluminum flat tube 2 until the two are connected. Under the action of the electric guide rail 1 6, the pair of left push plates 7 push the aluminum flat tube 2 toward the two sets of straightening rollers 5.

[0050] See also Figure 2 and Figure 5 , Figure 6 , there are multiple inner support components 13, and the number of the inner support components 13 matches the number of the square hole channels 201 in the aluminum flat tube 2, so that during the rolling and pushing process of the aluminum flat tube 2, the square hole channels 201 pass through the inner support components 13, and the inner support components 13 play a supporting role on the inside of the square hole channels 201, so as to prevent the aluminum flat tube 2 from being partially sunken inward due to improper straightening force during the straightening roller 5 straightening and rolling the end face of the aluminum flat tube 2. Multiple inner support components 13 are arranged at the two groups of straightening rollers and extend to the outside of the straightening rollers. The left and right ends of the inner support components 13 are fixed by a positioning structure that works independently, and the overall length of the inner support components 13 is greater than the length of the aluminum flat tube 2;

[0051] See also Fig.10 During the horizontal pushing and straightening process of the aluminum flat tube 2, the first pushing mechanism is used to push the aluminum flat tube 2 from left to right. When the front end of the aluminum flat tube 2 is close to the head end of the inner support assembly 13, the limiting state of the end of the inner support assembly 13 by the positioning structure there is released, while the positioning structure 14 and the positioning structure on the other side still limit 13 to ensure the stability of 13.

[0052] The plurality of square hole channels 201 on the aluminum flat tube 2 pass through the plurality of inner support components 13, and the inner support components 13 support the inside of the square hole channels 201, see Figure 11-Figure 14During the continuous pushing of the aluminum flat tube 2, the contact area between the aluminum flat tube 2 and the inner support assembly 13 increases. When the aluminum flat tube 2 approaches the positioning structure 14, the restriction of the positioning structure on the inner support assembly 13 is released. When the rear end of the aluminum flat tube 2 completely passes through the head end of the inner support assembly 13 and the front end of the aluminum flat tube 2 is close to the end of the inner support assembly 13, the left positioning mechanism is used to reposition the head end of the inner support assembly 13, and then the restriction on the front end of the inner support assembly 13 by the right positioning mechanism is released, so that the aluminum flat tube 2 continues to be pushed to the left until it is completely separated from the inner support assembly 13. During the horizontal pushing of the aluminum flat tube 2, one of the positioning structures is always ensured to fix the end of the inner support assembly 13, so that the inner support assembly 13 maintains a stable state, and the two groups of straightening rollers 5 arranged on the left and right perform straightening roller pressing on the upper and lower end surfaces of the aluminum flat tube 2.

[0053] See also Fig.15 After the aluminum flat tube 2 is pushed away from the inner support assembly 13 by the first pushing mechanism, it is pushed in the opposite direction by the second pushing mechanism. During the reverse pushing process, the rolling distance between the upper and lower pairs of straightening rollers 5 is readjusted to appropriately increase the rolling pressure on the end face of the aluminum flat tube 2. The straightening height of the multiple inner support assemblies 13 is reset by the adjusting assembly 14. During the secondary adjustment, the straightening height of the inner support assembly 13 is kept consistent with the height inside the square hole channel 201. During the process, one of the positioning structures is always ensured to fix the end of the inner support assembly 13. After the reciprocating motion, the aluminum flat tube 2 is straightened and pressed down.

[0054] Embodiment 2: Based on Embodiment 1, this embodiment describes in detail the structure of the inner support assembly 13 and the adjustment assembly 14 for adjusting the inner support assembly 13, as follows:

[0055] For details, please refer to Figure 5-Figure 9 The inner support assembly 13 includes a fixed rod 131 and a magnetic movable sleeve 132 slidably mounted on the upper and lower ends thereof. The ends of both sides of the fixed rod 131 can penetrate elastic tubes connected to the magnetic movable sleeve 132 to prevent the magnetic movable sleeve 132 from slipping off the fixed rod 131. The left and right ends of the fixed rod 131 are fixedly connected with magnetic positioning rods 133 adapted to the positioning structure. The magnetic positioning rod 133 is consistent in size with the fixed rod 131. Two magnetic sheets 134 are embedded in the upper and lower end walls of the fixed rod 131 from the inside to the outside. A pair of magnetic movable sleeves 132 are embedded with magnetic strips 135 that are magnetically attracted to the magnetic sheet 134 at one end thereof.

[0056] The positioning structure includes a slideway 10 fixed on the operating table 1, a clamping seat 12 is slidably installed on the slideway 10 through an electric push cylinder 11, and a 121 with the same thickness as the magnetic positioning rod 133 and an open end is provided on the clamping seat 12, and an electromagnetic sheet for magnetically positioning the magnetic positioning rod 133 is embedded and installed inside the 121, and a pair of clamping seats 12 are horizontally distributed outside the two groups of straightening rollers;

[0057] See also Figure 2 and Figure 6 The adjustment component 14 is distributed in the middle of the two groups of straightening roller groups. The adjustment component 14 includes a U-shaped frame 141 fixed on the operating table 1. The upper and lower ends of the U-shaped frame 141 are fixedly embedded with electric push rods 142. A pair of driving ends of the electric push rods 142 pass through the inner wall of the U-shaped frame 141 and are fixedly connected to an electromagnetic plate 143 located on the outer side of the inner support component 13. The upper and lower end walls of the multiple magnetic movable sleeves 132 are embedded with magnetic blocks 136 matching the electromagnetic plates 143.

[0058] In step 1, in the initial state, a pair of clamping seats 12 are magnetically docked with the magnetic positioning rods 133 on the inner support components 13, so that the multiple inner support components 13 are in a fixed state. At this time, the electromagnetic plate 143 is driven to contact the magnetic movable sleeve 132 by a pair of electric push rods 142 on the U-shaped frame 141, and the electromagnetic plate 143 is started. The electromagnetic plate 143 and the magnetic block 136 on the magnetic movable sleeve 132 are magnetically docked, and the magnetic attraction surface is wide and the magnetic attraction force is strong. The position of the magnetic movable sleeve 132 is adjusted by pushing the electromagnetic plate 143;

[0059] During the first adjustment, the electromagnetic plate 143 is used to push the magnetic movable sleeve 132 until the position of the magnetic strip 135 corresponds to the position of the inner magnetic sheet 134, and the position of the movable sleeve 132 is limited by the magnetic attraction of the magnetic strip 135 and the inner magnetic sheet 134. Note that the magnetic attraction force of the magnetic strip 135 and the inner magnetic sheet 134 is much greater than the squeezing force of the aluminum flat tube 2 on the magnetic movable sleeve 132 when it moves, that is, the movable sleeve 132 is in a stable state after being adjusted to a suitable position.

[0060] The distance between the pair of magnetic movable sleeves 132 is reduced, and the distance between the two is slightly smaller than the height of the square hole channel 201, so that when the square hole channel 201 extends into the inner support assembly 13, it can play a preliminary straightening role on the inward concave part of the aluminum flat tube 2;

[0061] In step 2, refer to Fig.10When the aluminum flat tube 2 is pushed to the magnetic positioning rod 133 at the head end of the inner support assembly 13, the positioning mode of the magnetic positioning rod 133 by the positioning mechanism there is released, that is, the clamping seat 12 is retracted outward by the electric push cylinder 11. After the clamping seat 12 is separated from the magnetic positioning rod 133, the aluminum flat tube 2 is continuously pushed forward by the first pushing mechanism, and the multiple square hole channels 201 on the aluminum flat tube 2 pass through the multiple inner support assemblies 13 one by one. The upper and lower distributed magnetic movable sleeves 132 play a role of supporting and straightening the inner concave parts of the square hole channels 201 outward;

[0062] Note that the end of the magnetic movable sleeve 132 is pre-rounded so that when the end of the magnetic movable sleeve 132 contacts the inner depression of the square hole channel 201, it can smoothly contact the depression and smoothly support the depression outward during the continuous pushing of the aluminum flat tube 2. Please refer to Fig.11 When the aluminum flat tube 2 moves to the adjustment assembly 14, the electromagnetic plate 143 is released from the positioning of the inner support assembly 13, the electromagnetic plate 143 is closed, and is pushed outward away from the magnetic movable sleeve 132, so that the aluminum flat tube 2 can pass smoothly between the pair of electromagnetic plates 143.

[0063] See also Fig.12 , Fig.13 When the end of the aluminum flat tube 2 is separated from the magnetic positioning rod 133 at the head end, the electric push cylinder 11 is used to reset the clamping seat 12 that has retreated outward inward to reposition the magnetic positioning rod 133. After positioning the head end of the inner support assembly 13, refer to Fig.13 , Fig.14 When the front end of the aluminum flat tube 2 moves to the magnetic positioning rod 133 at the end of the inner support assembly 13, the positioning mode of the clamping seat 12 there is released, that is, the clamping seat 12 there is retracted outward, so that the aluminum flat tube 2 can smoothly pass through multiple inner support assemblies 13 to reach a pair of right push plates 9 of the second pushing mechanism.

[0064] In step three, see Fig.14 When the aluminum flat tube 2 is pushed away from the inner support assembly 13 by the first pushing mechanism, the end of the aluminum flat tube 2 is engaged with a pair of right pushing plates 9, and the second adjustment is performed to readjust the rolling distance between the upper and lower pairs of straightening rollers 5 on the two sets of straightening rollers, and appropriately increase the rolling pressure on the end surface of the aluminum flat tube 2;

[0065] When the aluminum flat tube 2 is completely separated from the inner support assembly 13, the clamping seat 12 is reset so that the pair of clamping seats 12 are re-positioned at both ends of the inner support assembly 13, and then the electromagnetic plate 143 is driven upward and downward until it is magnetically docked with the magnetic movable sleeve 132, and the electromagnetic plate 143 drives the magnetic movable sleeve 132 to move outward until the magnetic strip 135 on the magnetic movable sleeve 132 is magnetically docked with the magnetic sheet 134 on the outside, thereby increasing the distance between the pair of magnetic movable sleeves 132, so that when the square hole channel 201 passes through the pair of magnetic movable sleeves 132, the contact and extrusion pressure of the pair of magnetic movable sleeves 132 on the upper and lower inner walls of the square hole channel 201 is increased, and compared with the first straightening, the straightening force of the straightening roller 5 and the magnetic movable sleeve 132 on the inner and outer walls of the aluminum flat tube 2 is increased during the second straightening process.

[0066] After the secondary straightening state of the straightening roller 5 and the inner support assembly 13 is determined, please refer to Fig.15 , use the second pushing mechanism to reverse the aluminum flat tube 2. During the retraction process, the positioning of the clamping seat 12 and the electromagnetic plate 143 on the inner support component 13 is released in turn. As in the first straightening process, one of the positioning structures is always guaranteed to fix the end of the inner support component 13. The double positioning of the positioning structure is used to improve the stability of the inner support component 13, and the reciprocating roller straightening is realized in combination with the gradual application of straightening force to slowly straighten the aluminum flat tube, thereby effectively improving the straightening effect of the aluminum flat tube.

[0067] The above are only preferred specific implementation modes of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. The straightening and pressing process suitable for microchannel flat aluminum tube processing is characterized by: The following steps are involved: Step 1: straightening and adjusting processing, firstly placing the aluminum flat tube (2) on the loading platform of the operating table (1), adjusting the roller pressing distance between the upper and lower pairs of straightening rollers (5) on the two groups of straightening roller groups, and adjusting the straightening height of the plurality of inner support components (13) fixed by a pair of positioning mechanisms using the adjusting component (14) according to the height of the square hole channel (201) of the aluminum flat tube (2); Step 2: a straightening and rolling process, using a first pushing mechanism to push the aluminum flat tube (2) from left to right, when the square hole channel (201) on the aluminum flat tube (2) passes through a plurality of inner support components (13), two groups of straightening rollers arranged on the left and right perform straightening and rolling on the upper and lower end surfaces of the aluminum flat tube (2) until the aluminum flat tube (2) is completely separated from the inner support components (13), completing a rolling process, and during the horizontal pushing process of the aluminum flat tube (2), the positioning mechanisms on the left and right sides always keep one of the positioning mechanisms on the inner support components (13) to limit the inner support components; Step 3: Reverse secondary straightening roller pressing treatment, re-adjust the roller pressing distance between the upper and lower pairs of straightening rollers (5) and the straightening height of the inner support assembly (13), appropriately increase the roller pressing pressure on the inner and outer end surfaces of the aluminum flat tube (2), and use the second pushing mechanism to push the aluminum flat tube (2) in the reverse direction. During the reverse pushing process, one of the positioning structures is always kept to fix the end of the inner support assembly (13), and the aluminum flat tube (2) completes the secondary straightening.

2. The straightening and pressing process suitable for processing microchannel flat aluminum tubes according to claim 1 is characterized in that: The straightening roller group comprises a pair of brackets (3) fixed to the upper end of the operating table (1) and distributed on the left and right, a pair of lifting seats (4) arranged vertically are installed between the pair of brackets (3) for lifting, and a pair of straightening rollers (5) distributed horizontally are installed on the opposite inner side end walls of the pair of lifting seats (4).

3. The straightening and pressing process suitable for processing microchannel flat aluminum tubes according to claim 1 is characterized in that: The first material pushing mechanism comprises an electric guide rail (6) fixed on the operating table (1) and located between a pair of brackets (3), and a left push plate (7) capable of horizontal movement is installed on the pair of electric guide rails (6) through a bracket (1). The second material pushing mechanism comprises an electric guide rail (8) also fixed on the operating table (1) and located between the pair of brackets (3), and a right push plate (9) capable of horizontal movement is installed on the pair of electric guide rails (8) through a bracket (2).

4. The straightening and pressing process suitable for processing microchannel flat aluminum tubes according to claim 1 is characterized in that: The inner support assembly (13) comprises a fixed rod (131) and a magnetic movable sleeve (132) slidably mounted on the upper and lower ends thereof; the left and right ends of the fixed rod (131) are fixedly connected to magnetic positioning rods (133) adapted to the positioning structure; the upper and lower end walls of the fixed rod (131) are embedded with two magnetic sheets (134) from the inside to the outside; and a pair of opposite ends of the magnetic movable sleeves (132) are embedded with magnetic strips (135) magnetically attracted to the magnetic sheets (134).

5. The straightening and pressing process suitable for processing microchannel flat aluminum tubes according to claim 4 is characterized in that: The positioning structure comprises a slideway (10) fixed on the operating table (1), a clamping seat (12) being slidably mounted on the slideway (10) via an electric push cylinder (11), the clamping seat (12) being provided with a portion (121) having the same thickness as the magnetic positioning rod (133) and open at one end, an electromagnetic sheet for magnetically attracting and positioning the magnetic positioning rod (133) being embedded and mounted inside the portion (121).

6. The straightening and pressing process suitable for processing microchannel flat aluminum tubes according to claim 5 is characterized in that: A pair of the clamping seats (12) are horizontally distributed outside the two groups of straightening rollers, and the adjustment components (14) are distributed in the middle of the two groups of straightening rollers.

7. The straightening and pressing process for processing microchannel flat aluminum tubes according to claim 6 is characterized in that: The adjustment component (14) comprises a U-shaped frame (141) fixed on the operating table (1), and electric push rods (142) are fixedly embedded and installed at the upper and lower ends of the U-shaped frame (141), and a pair of driving ends of the electric push rods (142) penetrate the inner wall of the U-shaped frame (141) and are fixedly connected to an electromagnetic plate (143) located on the outside of the inner support component (13).

8. The straightening and pressing process for processing microchannel flat aluminum tubes according to claim 7 is characterized in that: The upper and lower end walls of the plurality of magnetic movable sleeves (132) are both embedded with magnetic blocks (136) that match the electromagnetic plates (143).

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