A continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes

Abstract

The present invention belongs to the technical field of microchannel zinc-aluminum sprayed flat tube processing technology, and specifically relates to a continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes. The extrusion device used includes a frame, a traction assembly, and an extrusion assembly. A plurality of traction assemblies distributed front and back are provided on the right part of the frame, and a plurality of extrusion assemblies distributed front and back are provided on the top of the frame. The positions of the extrusion assemblies correspond to the positions of the traction assemblies one by one. The traction assembly includes four traction shaft frames fixedly installed on the right part of the frame, and the four traction shaft frames are distributed up and down, front and back. The outer surface of the zinc-aluminum sprayed flat tube is adsorbed by the vacuum suction cups of the traction assembly, and the zinc-aluminum sprayed flat tube is pulled to move, so that no inward collapsing force is generated on the surface of the zinc-aluminum sprayed flat tube, and while ensuring the traction of the zinc-aluminum sprayed flat tube, the zinc-aluminum sprayed flat tube will not collapse and deform, so as to ensure the quality of the pressing process of the zinc-aluminum sprayed flat tube and reduce the rejection rate of the pressed products.

Description

Technical Field

[0001] The present invention belongs to the technical field of microchannel zinc-aluminum sprayed flat tube processing, and specifically relates to a continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes. Background Art

[0002] A microchannel aluminum flat tube (also known as a "parallel flow aluminum flat tube") is a thin-walled, multi-porous flat tube material made of refined aluminum rods through extrusion. After surface zinc spraying for anti-corrosion treatment, it is also called a "zinc-aluminum sprayed flat tube". It is mainly used in various air conditioning systems, uses a new type of environmentally friendly refrigerant, and is a key material for a new generation of parallel flow microchannel air conditioner heat exchangers.

[0003] After retrieval, a Chinese patent with the publication number CN109570254A discloses a hot extrusion rough forming device for a heat transfer aluminum tube blank. During the process of the aluminum tube coming out after being formed, nitrogen is used for cooling and anti-oxidation treatment, so that the aluminum tube has a certain toughness, improving the quality of the aluminum tube. And a limit ejector pin is installed on the front end face of the extrusion hammer, saving a process in the production process of the aluminum tube, thus greatly improving the production efficiency.

[0004] However, during the use of the above device, the extrusion hammer is prone to cause side pressure on the aluminum tube. Since the hardness of the aluminum tube material is not high, it is easy to cause it to collapse and deform inward under side pressure, thus affecting the quality of the formed product. Summary of the Invention

[0005] The purpose of the present invention is to provide a continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes to solve the problems raised in the above background art.

[0006] The present invention provides the following technical solution: A continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes, including

[0007] The following steps:

[0008] S1: The zinc-aluminum sprayed flat tube is successively wound in the extrusion grooves on the outer walls of the left and right adjacent extrusion grooved wheels through an extrusion device, making the zinc-aluminum sprayed flat tube in a wavy shape. After passing through the inside of the traction assembly, it is wound around the bottom of the outer wall of the guide roller. After passing through the inside of the frame, it finally passes out from the left end of the frame and is fixed on the winding rack, and the winding rack is driven to rotate by an external winding device;

[0009] S2: During processing, first start the reduction motor. The output shaft of the reduction motor drives the active sprocket to rotate. Then, under the connection of the power chain, the driven sprocket and the guide roller are driven to rotate. The guide roller drives the active synchronous pulley to rotate together through its central shaft. Then, under the connection with the synchronous belt, the driven synchronous pulley and a traction shaft body connected thereto are driven to rotate. The traction shaft body drives the traction sprocket connected thereto to rotate together. Thus, under the cooperation of the upper and lower traction sprockets, the traction chain runs around the upper and lower traction chains. The traction chain drives a plurality of micro-cylinder sleeves, telescopic tubes, sliding air needles and vacuum suction cups to run together through a plurality of bow frames. When the vacuum suction cup moves downward from the top during the operation of the traction chain, the end of the vacuum suction cup first contacts the outer surface of the zinc-aluminum spraying flat tube. Then, under the reaction force of the zinc-aluminum spraying flat tube on the vacuum suction cup, when the sliding air needle is pushed along the telescopic hole towards the direction of the micro-cylinder sleeve, the sliding air needle drives the spring fixing ring to move together, thereby compressing the pressing spring. The reverse pressure is applied through the resilience generated by the pressing spring, so as to ensure that the vacuum suction cup is fully attached to the surface of the zinc-aluminum spraying flat tube, to ensure the airtightness between the vacuum suction cup and the zinc-aluminum spraying flat tube. As the micro-cylinder sleeve continues to move downward, under the connection of the piston and the push rod, the L-shaped bracket and the pin are driven to move downward together, so that the pin gradually approaches the top of the guide bar. When the pin moves to the top of the guide bar, the outer wall of the pin first contacts the top inclined guide surface, so that when the pin continues to move downward, the inclined guide surface generates a wedging force on the pin in the direction close to the micro-cylinder sleeve. Then, under the connection of the L-shaped bracket and the push rod, the piston is pushed to move away from the telescopic tube, so that the return spring is compressed and stores energy. During the movement of the return spring, a negative pressure is generated in the area on the left side of the piston inside the micro-cylinder sleeve and is transmitted to the inside of the vacuum suction cup through the sliding air needle, so that the vacuum suction cup is firmly adsorbed on the outer surface of the zinc-aluminum spraying flat tube to pull the zinc-aluminum spraying flat tube downward;

[0010] S3: By loosening the bolts fixing the upper extrusion seat and the extrusion base, the upper extrusion seat can be removed from the top of the extrusion base, and then the extrusion grooved wheel can be removed. Other extrusion grooved wheels of different specifications can be replaced to press zinc-aluminum spraying flat tubes of different models. After the extrusion grooved wheel is replaced, install the upper extrusion seat on the top of the extrusion base and fix it again with bolts.

[0011] As a preferred solution of the present invention, the extrusion device includes a frame, a traction assembly and an extrusion assembly. A plurality of traction assemblies distributed front and back are provided on the right part of the frame, and a plurality of extrusion assemblies distributed front and back are provided on the top of the frame. The positions of the extrusion assemblies correspond to the positions of the traction assemblies one by one;

[0012] The traction assembly includes four traction shaft frames fixedly installed on the right part of the frame. The four traction shaft frames are distributed vertically and horizontally. Between the front and rear traction shaft frames, two traction shafts distributed left and right are rotatably installed. On the outer walls of the traction shafts, two traction sprockets distributed front and rear are fixedly installed. Around the upper and lower traction sprockets, a traction chain is commonly sleeved. There are two traction sprockets, and a bow-shaped frame is fixedly installed between the two traction sprockets. Inside the bow-shaped frame, a micro cylinder sleeve is fixedly installed. On one side of the micro cylinder sleeve, a telescopic tube is fixedly installed. On the left and right sides of the telescopic tube, telescopic holes are penetrated. Inside the telescopic holes, sliding air needles are slidably installed. The end of the sliding air needle far from the micro cylinder sleeve is fixedly installed with a vacuum suction cup. Inside the inner wall of the micro cylinder sleeve, a piston is slidably installed. On the side of the piston close to the vacuum suction cup, a push rod is fixedly installed. The end of the push rod far from the piston is fixedly installed with an L-shaped bracket. On the side of the L-shaped bracket far from the telescopic tube, a pin is fixedly installed.

[0013] The traction assembly further includes a fixed side plate fixedly installed between the upper and lower traction shaft frames. On the side of the fixed side plate close to the traction chain, a guide bar is fixedly installed. On the top and bottom of the guide bar, inclined guide surfaces are opened. The position of the guide bar corresponds to the position of the pin.

[0014] As a preferred solution of the present invention, the number of the bow-shaped frames is multiple, and the multiple bow-shaped frames are equidistantly distributed around the traction chain.

[0015] As a preferred solution of the present invention, the sliding air needle movably penetrates the telescopic hole and extends into the interior of the micro cylinder sleeve. On the outer wall of the sliding air needle, a spring fixing ring is fixedly installed, and a compression spring is sleeved around the sliding air needle. The compression spring is fixedly installed between the right side surface of the spring fixing ring and the right wall of the telescopic tube.

[0016] As a preferred solution of the present invention, a return spring is fixedly installed between the side surface of the piston far from the sliding air needle and the right wall of the micro cylinder sleeve.

[0017] As a preferred solution of the present invention, the extrusion assembly includes two front and rear extrusion seats. Between the two front and rear extrusion seats, a plurality of extrusion grooved wheels equally spaced left and right are rotatably installed. The outer walls of the two adjacent left and right extrusion grooved wheels are in mutual contact.

[0018] As a preferred solution of the present invention, two front and rear guide shaft frames are fixedly installed on the right part of the frame. Both of the two guide shaft frames are located at the bottom of the traction assembly, and a guide roller is rotatably installed between the two guide shaft frames.

[0019] As a preferred embodiment of the present invention, two adjacent traction shaft bodies are connected by a transmission rod. A driving synchronous pulley is fixedly installed on the front part of the outer wall of the central axis of the guiding shaft frame. A driven synchronous pulley is fixedly installed on the outer wall of one of the traction shaft bodies located in the front part. A synchronous belt is sleeved around the periphery of the driving synchronous pulley and the driven synchronous pulley.

[0020] As a preferred embodiment of the present invention, a reduction motor is fixedly provided on the right part of the frame. A driving sprocket is fixedly installed on the output shaft of the reduction motor. A driven sprocket is fixedly installed on the front end of the outer wall of the central axis of the guiding shaft frame. A power chain is sleeved around the periphery of the driving sprocket and the driven sprocket.

[0021] As a preferred embodiment of the present invention, the extrusion seat includes an upper extrusion seat and a lower extrusion seat. The upper extrusion seat is fixedly installed on the top of the lower extrusion seat by bolts. The lower extrusion seat is fixedly installed on the top of the frame by bolts.

[0022] As a preferred embodiment of the present invention, the vacuum suction cup is fixedly installed at the end of the sliding air needle by means of threaded connection.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. In the present invention, the vacuum suction cup of the traction assembly adsorbs on the outer surface of the zinc-aluminum sprayed flat tube, and the zinc-aluminum sprayed flat tube is pulled to move, so that no inward collapsing force is generated on the surface of the zinc-aluminum sprayed flat tube. While ensuring the traction of the zinc-aluminum sprayed flat tube, the zinc-aluminum sprayed flat tube will not collapse and deform, so as to ensure the quality of the pressing process of the zinc-aluminum sprayed flat tube and reduce the rejection rate of the pressed products.

[0025] 2. In the present invention, when the vacuum suction cup moves downward from the top during the operation along with the traction chain, first, the end of the vacuum suction cup contacts the outer surface of the zinc-aluminum sprayed flat tube. Thus, during the process that the sliding air needle is pushed along the telescopic hole towards the direction of the micro cylinder sleeve under the reaction force of the zinc-aluminum sprayed flat tube on the vacuum suction cup, the sliding air needle drives the spring fixing ring to move together, thereby compressing the compression spring. The reverse pressure is applied through the resilience generated by the compression spring to ensure full contact between the vacuum suction cup and the surface of the zinc-aluminum sprayed flat tube, so as to ensure the airtightness between the vacuum suction cup and the zinc-aluminum sprayed flat tube, and further ensure sufficient traction force on the zinc-aluminum sprayed flat tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a front-view structural schematic diagram of the present invention;

[0028] Figure 3 is a structural schematic diagram of the traction assembly in the present invention;

[0029] Figure 4 In the present invention Figure 3 Schematic diagram of the enlarged structure at position A;

[0030] Figure 5 Schematic diagram of the structure of the traction assembly in the present invention;

[0031] Figure 6 Planar structure schematic diagram of the traction assembly in the present invention;

[0032] Figure 7 In the present invention Figure 6 Schematic diagram of the enlarged structure of part B;

[0033] Figure 8 Schematic diagram of the sectional structure of the micro cylinder liner and the telescopic tube in the present invention.

[0034] In the figure: 100, frame; 200, traction assembly; 201, traction shaft frame; 2002, traction shaft body; 202, traction sprocket; 203, traction chain; 204, bow frame; 205, micro cylinder liner; 206, telescopic tube; 207, telescopic hole; 208, sliding air needle; 209, vacuum suction cup; 2010, spring fixing ring; 2011, compression spring; 2012, piston; 2013, push rod; 2014, L-shaped bracket; 2015, pin; 2016, return spring; 2017, fixed side plate; 2018, guide bar; 2019, inclined guide surface; 300, extrusion assembly; 301, extrusion seat; 30101, upper extrusion seat; 30102, lower extrusion seat; 302, extrusion grooved wheel; 401, guide shaft frame; 402, guide roller; 501, driving synchronous pulley; 502, driven synchronous pulley; 503, synchronous belt; 601, reduction motor; 602, driving sprocket; 603, driven sprocket; 604, power chain. Detailed implementation manners

[0035] 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-8 , the technical solutions provided by the present invention specifically include the following embodiments:

[0037] Embodiment 1

[0038] A continuous extrusion process for microchannel zinc-aluminum sprayed flat tubes. The extrusion device used includes a frame 100, a traction assembly 200, and an extrusion assembly 300. A plurality of traction assemblies 200 are arranged in the front and rear directions on the right side of the frame 100, and a plurality of extrusion assemblies 300 are arranged in the front and rear directions on the top of the frame 100. The positions of the extrusion assemblies 300 correspond one by one to the positions of the traction assemblies 200;

[0039] The traction assembly 200 includes four traction axle frames 201 fixedly installed on the right side of the frame 100. The four traction axle frames 201 are distributed in the up-down and front-back directions. Between the front and rear traction axle frames 201, two traction axle bodies 2002 are rotatably installed in the left-right direction. On the outer walls of the traction axle bodies 2002, two traction sprockets 202 are fixedly installed in the front and rear directions. Around the outer peripheries of the two traction sprockets 202 in the up-down position, a traction chain 203 is commonly sleeved. There are two traction sprockets 202, and an arch frame 204 is fixedly installed between the two traction sprockets 202. The number of arch frames 204 is multiple, and the multiple arch frames 204 are equidistantly distributed around the traction chain 203. A micro cylinder sleeve 205 is fixedly installed inside the arch frame 204. On one side surface of the micro cylinder sleeve 205, a telescopic tube 206 is fixedly installed. Telescopic holes 207 are penetrated and opened on the left and right side surfaces of the telescopic tube 206. A sliding air needle 208 is slidably installed inside the telescopic hole 207. At one end of the sliding air needle 208 away from the micro cylinder sleeve 205, a vacuum chuck 209 is fixedly installed. The vacuum chuck 209 is fixedly installed at the end of the sliding air needle 208 by means of threaded connection. A piston 2012 is slidably installed inside the inner wall of the micro cylinder sleeve 205. On one side surface of the piston 2012 close to the vacuum chuck 209, a push rod 2013 is fixedly installed. At one end of the push rod 2013 away from the piston 2012, an L-shaped bracket 2014 is fixedly installed. On one side surface of the L-shaped bracket 2014 away from the telescopic tube 206, a pin 2015 is fixedly installed. Between one side surface of the piston 2012 away from the sliding air needle 208 and the right wall of the micro cylinder sleeve 205, a return spring 2016 is fixedly installed;

[0040] The traction assembly 200 further includes a fixed side plate 2017 fixedly installed between the upper and lower traction axle frames 201. On one side surface of the fixed side plate 2017 close to the traction chain 203, a guide bar 2018 is fixedly installed. Tapered guide surfaces 2019 are opened on the top and bottom of the guide bar 2018. The position of the guide bar 2018 corresponds to the position of the pin 2015. The sliding air needle 208 movably penetrates the telescopic hole 207 and extends into the inside of the micro cylinder sleeve 205. A spring fixing ring 2010 is fixedly installed on the outer wall of the sliding air needle 208, and a compression spring 2011 is sleeved around the sliding air needle 208. The compression spring 2011 is fixedly installed between the right side surface of the spring fixing ring 2010 and the right wall of the telescopic tube 206;

[0041] In this embodiment, specifically, by rotating the traction shaft body 2002, the connected traction sprocket 202 is driven to rotate together. Thus, under the combined action of the upper and lower traction sprockets 202, the traction chain 203 runs around the upper and lower traction chains 203. The traction chain 203 drives a plurality of micro-cylinder sleeves 205, telescopic tubes 206, sliding air needles 208, and vacuum suction cups 209 to run together through a plurality of bow frames 204. When the vacuum suction cup 209 moves downward from the top during the operation with the traction chain 203, the end of the vacuum suction cup 209 first contacts the outer surface of the zinc-aluminum spraying flat tube. Thus, during the process of pushing the sliding air needle 208 along the telescopic hole 207 towards the direction of the micro-cylinder sleeve 205 under the reaction force of the zinc-aluminum spraying flat tube on the vacuum suction cup 209, the sliding air needle 208 drives the spring fixing ring 2010 to move together, thereby compressing the compression spring 2011. Reverse pressure is applied through the resilience generated by the compression spring 2011 to ensure full contact between the vacuum suction cup 209 and the surface of the zinc-aluminum spraying flat tube, and further ensure the airtightness between the vacuum suction cup 209 and the zinc-aluminum spraying flat tube. As the micro-cylinder sleeve 205 continues to move downward, under the connection of the piston 2012 and the push rod 2013, the L-shaped bracket 2014 and the pin 2015 are driven to move downward together, making the pin 2015 gradually approach the top of the guide bar 2018. When the pin 2015 moves to the top of the guide bar 2018, the outer wall of the pin 2015 first contacts the top inclined guide surface 2019. During the process of the pin 2015 continuing to move downward, a wedging force in the direction approaching the micro-cylinder sleeve 205 is generated on the pin 2015 through the inclined guide surface 2019. Thus, under the connection of the L-shaped bracket 2014 and the push rod 2013, the piston 2012 is pushed to move away from the telescopic tube 206, compressing and storing energy in the return spring 2016. During the movement of the return spring 2016, a negative pressure is generated in the area inside the micro-cylinder sleeve 205 to the left of the piston 2012 and is transmitted to the inside of the vacuum suction cup 209 through the sliding air needle 208. Thus, the vacuum suction cup 209 is firmly adsorbed on the outer surface of the zinc-aluminum spraying flat tube to pull the zinc-aluminum spraying flat tube downward, thereby performing a flow-type extrusion process on the zinc-aluminum spraying flat tube. Compared with the prior art, the deformation of the zinc-aluminum spraying flat tube can be avoided, ensuring the quality of the pressing process of the zinc-aluminum spraying flat tube and reducing the rejection rate of the pressed products.

[0042] Embodiment Two

[0043] The extrusion assembly 300 includes two front and rear extrusion seats 301. A plurality of extrusion grooved pulleys 302 are rotatably installed between the two front and rear extrusion seats 301 and are equally spaced left and right. The outer walls of two adjacent extrusion grooved pulleys 302 are in mutual contact. The extrusion seat 301 includes an upper extrusion seat 30101 and a lower extrusion seat 30102. The upper extrusion seat 30101 is fixedly installed on the top of the lower extrusion seat 30102 through bolts, and the lower extrusion seat 30102 is fixedly installed on the top of the frame 100 through bolts;

[0044] Two guiding shaft brackets 401 distributed front and back are fixedly installed on the right part of the frame 100. Both of the two guiding shaft brackets 401 are located at the bottom of the traction assembly 200, and a guiding roller 402 is rotatably installed between the two guiding shaft brackets 401;

[0045] Specifically in this embodiment, the zinc-aluminum spraying flat tube is wound around the extrusion grooves on the outer walls of the adjacent left and right extrusion grooved wheels 302 in sequence, so that the zinc-aluminum spraying flat tube is in a wavy shape, and thus the zinc-aluminum spraying flat tube can be bent up and down multiple times to eliminate the concentrated stress generated during the pressing process of the zinc-aluminum spraying flat tube. Subsequently, the zinc-aluminum spraying flat tube passes through the inside of the traction assembly 200 and then is wound around the bottom of the outer wall of the guiding roller 402 to optimize the moving track of the zinc-aluminum spraying flat tube. After passing through the inside of the frame 100, it finally passes out from the left end of the frame 100 and is fixed on the winding rack, and the winding rack is driven to rotate by an external winding device.

[0046] Embodiment Three

[0047] Among them, adjacent front and back traction shaft bodies 2002 are connected by transmission rods. A driving synchronous pulley 501 is fixedly installed on the front part of the outer wall of the central shaft of the guiding shaft bracket 401. A driven synchronous pulley 502 is fixedly installed on the outer wall of one of the traction shaft bodies 2002 located at the front part. A synchronous belt 503 is sleeved around the peripheries of the driving synchronous pulley 501 and the driven synchronous pulley 502;

[0048] A reduction motor 601 is fixedly provided on the right part of the frame 100. A driving sprocket 602 is fixedly installed on the output shaft of the reduction motor 601. A driven sprocket 603 is fixedly installed on the front end of the outer wall of the central shaft of the guiding shaft bracket 401. A power chain 604 is sleeved around the peripheries of the driving sprocket 602 and the driven sprocket 603;

[0049] Specifically in this embodiment, the output shaft of the reduction motor 601 drives the driving sprocket 602 to rotate, so as to drive the driven sprocket 603 and the guiding roller 402 to rotate under the connection action of the power chain 604. Since the guiding roller 402 is rotatably installed through the front and back two guiding shaft brackets 401 to ensure the stability and smoothness during the rotation of the guiding roller 402. At the same time, the guiding roller 402 drives the driving synchronous pulley 501 to rotate together through its central shaft, so as to drive the driven synchronous pulley 502 and a traction shaft body 2002 connected thereto to rotate under the connection action with the synchronous belt 503, and the traction shaft body 2002 drives the traction sprocket 202 connected thereto to rotate together.

[0050] In this solution, the zinc-aluminum spraying flat tube is successively wound in the extrusion grooves on the outer walls of the left and right adjacent extrusion grooved pulleys 302, making the zinc-aluminum spraying flat tube in a wavy shape. Then the zinc-aluminum spraying flat tube passes through the inside of the traction assembly 200 and is wound around the bottom of the outer wall of the guide roller 402. After passing through the inside of the frame 100, it finally passes out from the left end of the frame 100 and is fixed on the winding rack, and the winding rack is driven to rotate by an external winding device;

[0051] During processing, first start the reduction motor 601. Drive the driving sprocket 602 to rotate through the output shaft of the reduction motor 601, so as to drive the driven sprocket 603 and the guide roller 402 to rotate under the connection of the power chain 604. Since the guide roller 402 is rotatably installed through the front and rear guide shaft brackets 401 to ensure the stability and smoothness during the rotation of the guide roller 402. At the same time, the guide roller 402 drives the driving synchronous pulley 501 to rotate together through its central shaft, so as to drive the driven synchronous pulley 502 and a traction shaft body 2002 connected thereto to rotate under the connection of the synchronous belt 503. The traction shaft body 2002 drives the traction sprocket 202 connected thereto to rotate together, so as to make the traction chain 203 run around the upper and lower traction chains 203 under the cooperation of the upper and lower traction sprockets 202. The traction chain 203 drives a plurality of micro cylinder sleeves 205, telescopic tubes 206, sliding air needles 208 and vacuum suction cups 209 to run together through a plurality of bow frames 204. When the vacuum suction cup 209 moves downward from the top during the operation of the traction chain 203, the end of the vacuum suction cup 209 first contacts the outer surface of the zinc-aluminum spraying flat tube. Thus, when the sliding air needle 208 is pushed along the telescopic hole 207 towards the direction of the micro cylinder sleeve 205 under the reaction force of the zinc-aluminum spraying flat tube on the vacuum suction cup 209, the sliding air needle 208 drives the spring fixing ring 2010 to move together, so as to compress the pressing spring 2011. Reverse pressure is applied through the resilience generated by the pressing spring 2011 to ensure full contact between the vacuum suction cup 209 and the surface of the zinc-aluminum spraying flat tube, and further ensure the airtightness between the vacuum suction cup 209 and the zinc-aluminum spraying flat tube. As the micro cylinder sleeve 205 continues to move downward, drive the L-shaped bracket 2014 and the pin 2015 to move downward together under the connection of the piston 2012 and the push rod 2013, so that the pin 2015 gradually approaches the top of the guide bar 2018. When the pin 2015 moves to the top of the guide bar 2018, the outer wall of the pin 2015 first contacts the top inclined guide surface 2019, so that when the pin 2015 continues to move downward, a wedging force in the direction close to the micro cylinder sleeve 205 is generated on the pin 2015 through the inclined guide surface 2019. Thus, drive the piston 2012 to move away from the telescopic tube 206 under the connection of the L-shaped bracket 2014 and the push rod 2013, so that the return spring 2016 is compressed and stores energy. And during the movement of the return spring 2016, a negative pressure is generated in the area inside the micro cylinder sleeve 205 on the left side of the piston 2012, and is transmitted to the inside of the vacuum suction cup 209 through the sliding air needle 208, so that the vacuum suction cup 209 is firmly adsorbed on the outer surface of the zinc-aluminum spraying flat tube, so as to pull the zinc-aluminum spraying flat tube to move downward, thereby performing flow extrusion processing on the zinc-aluminum spraying flat tube. Compared with the prior art, the deformation of the zinc-aluminum spraying flat tube can be avoided, so as to ensure the quality of the pressing processing of the zinc-aluminum spraying flat tube and reduce the unqualified rate of the pressed products;

[0052] By loosening the bolts fixing the upper extrusion seat 30101 and the extrusion base 30102, the upper extrusion seat 30101 can be removed from the top of the extrusion base 30102, and then the extrusion grooved pulley 302 can be removed. Other extrusion grooved pulleys 302 with different specifications can be replaced to press zinc-aluminum flat tubes of different models. After the extrusion grooved pulley 302 is replaced, the upper extrusion seat 30101 is installed on the top of the extrusion base 30102 and fixed again with bolts.

[0053] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes, characterized in that: It includes a frame (100), a traction assembly (200) and an extrusion assembly (300). A plurality of traction assemblies (200) distributed front and back are provided on the right part of the frame (100), and a plurality of extrusion assemblies (300) distributed front and back are provided on the top of the frame (100). The positions of the extrusion assemblies (300) correspond to those of the traction assemblies (200) one by one; The traction assembly (200) includes four traction shaft frames (201) fixedly installed on the right part of the frame (100). The four traction shaft frames (201) are distributed up and down, front and back. Between the two front and back traction shaft frames (201), two traction shaft bodies (2002) distributed left and right are rotatably installed. On the outer walls of the traction shaft bodies (2002), two traction sprockets (202) distributed front and back are fixedly installed. Around the two traction sprockets (202) in the up and down positions, a traction chain (203) is jointly sleeved. There are two traction sprockets (202). A bow-shaped frame (204) is fixedly installed between the two traction sprockets (202). Inside the bow-shaped frame (204), a micro cylinder sleeve (205) is fixedly installed. On one side surface of the micro cylinder sleeve (205), a telescopic tube (206) is fixedly installed. Telescopic holes (207) are respectively formed through the left side surface and the right side surface of the telescopic tube (206). Inside the telescopic holes (207), sliding air needles (208) are slidably installed. At one end of the sliding air needle (208) far from the micro cylinder sleeve (205), a vacuum suction cup (209) is fixedly installed. Inside the inner wall of the micro cylinder sleeve (205), a piston (2012) is slidably installed. On one side surface of the piston (2012) close to the vacuum suction cup (209), a push rod (2013) is fixedly installed. At one end of the push rod (2013) far from the piston (2012), an L-shaped bracket (2014) is fixedly installed. On one side surface of the L-shaped bracket (2014) far from the telescopic tube (206), a pin (2015) is fixedly installed; The traction assembly (200) further includes a fixed side plate (2017) fixedly installed between the upper and lower traction shaft frames (201). On one side surface of the fixed side plate (2017) close to the traction chain (203), a guide bar (2018) is fixedly installed. Oblique guide surfaces (2019) are respectively formed at the top and the bottom of the guide bar (2018). The position of the guide bar (2018) corresponds to that of the pin (2015); The number of the bow-shaped frames (204) is multiple, and the multiple bow-shaped frames (204) are equidistantly distributed around the traction chain (203); The sliding air needle (208) movably penetrates through the telescopic hole (207) and extends into the micro cylinder sleeve (205). A spring fixing ring (2010) is fixedly installed on the outer wall of the sliding air needle (208), and a compression spring (2011) is sleeved on the outer periphery of the sliding air needle (208). The compression spring (2011) is fixedly installed between the right side surface of the spring fixing ring (2010) and the right wall of the telescopic tube (206); A return spring (2016) is fixedly installed between one side of the piston (2012) away from the sliding air needle (208) and the right wall of the micro cylinder liner (205); The extrusion assembly (300) includes two front and rear extrusion seats (301). A plurality of extrusion grooved wheels (302) evenly distributed at equal intervals left and right are rotatably installed between the two front and rear extrusion seats (301), and the outer walls of two adjacent extrusion grooved wheels (302) on the left and right are in mutual contact.

2. The continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes according to claim 1, wherein: Two front and rear distributed guide shaft frames (401) are fixedly installed on the right part of the frame (100). Both of the two guide shaft frames (401) are located at the bottom of the traction assembly (200), and a guide roller (402) is rotatably installed between the two guide shaft frames (401).

3. The continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes according to claim 2, wherein: Among them, adjacent front and rear traction shaft bodies (2002) are all connected by transmission rods. A driving synchronous pulley (501) is fixedly installed on the front part of the outer wall of the central axis of the guide shaft frame (401). A driven synchronous pulley (502) is fixedly installed on the outer wall of one of the traction shaft bodies (2002) located in the front. A synchronous belt (503) is jointly sleeved on the peripheries of the driving synchronous pulley (501) and the driven synchronous pulley (502).

4. A continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes according to claim 3, characterized in that: A reduction motor (601) is fixedly provided on the right part of the frame (100). A driving sprocket (602) is fixedly installed on the output shaft of the reduction motor (601). A driven sprocket (603) is fixedly installed on the front end of the outer wall of the central axis of the guide shaft frame (401). A power chain (604) is jointly sleeved on the peripheries of the driving sprocket (602) and the driven sprocket (603).

5. The continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes according to claim 4, wherein: The extrusion seat (301) includes an upper extrusion seat (30101) and a lower extrusion seat (30102). The upper extrusion seat (30101) is fixedly installed on the top of the lower extrusion seat (30102) by bolts, and the lower extrusion seat (30102) is fixedly installed on the top of the frame (100) by bolts.

6. The continuous extrusion device for microchannel zinc-aluminum sprayed flat tubes according to claim 5, characterized in that: The vacuum chuck (209) is fixedly installed at the end of the sliding air needle (208) by means of threaded connection.

7. An extrusion process for a continuous extrusion device of a microchannel zinc-aluminum sprayed flat tube as described in claim 6, characterized in that, It includes the following steps: S1: Wind the zinc-aluminum sprayed flat tube around the extrusion grooves on the outer walls of the left and right adjacent extrusion grooved wheels (302) in sequence, so that the zinc-aluminum sprayed flat tube is in a wavy shape. Pass the zinc-aluminum sprayed flat tube through the inside of the traction assembly (200) and then wind it around the bottom of the outer wall of the guide roller (402). After passing through the inside of the frame (100), finally pass through the left end of the frame (100) and fix it on the winding rack, and drive the winding rack to rotate by an external winding device; S2: During processing, first start the reduction motor (601). The output shaft of the reduction motor (601) drives the active sprocket (602) to rotate. Thus, under the connection of the power chain (604), the driven sprocket (603) and the guide roller (402) are driven to rotate. The guide roller (402) drives the active synchronous pulley (501) to rotate together through its central axis. Thus, under the connection with the synchronous belt (503), the driven synchronous pulley (502) and a traction shaft body (2002) connected thereto are driven to rotate. The traction shaft body (2002) drives the traction sprocket (202) connected thereto to rotate together. Thus, under the cooperative action of the upper and lower traction sprockets (202), the traction chain (203) runs around the upper and lower traction chains (203). The traction chain (203) drives a plurality of micro-cylinder sleeves (205), telescopic tubes (206), sliding air needles (208) and vacuum suction cups (209) to run together through a plurality of bow frames (204). When the vacuum suction cup (209) moves downward from the top during the operation of the traction chain (203), the end of the vacuum suction cup (209) first contacts the outer surface of the zinc-aluminum sprayed flat tube. Thus, during the process of pushing the sliding air needle (208) along the telescopic hole (207) towards the micro-cylinder sleeve (205) under the reaction force of the zinc-aluminum sprayed flat tube on the vacuum suction cup (209), the sliding air needle (208) drives the spring fixing ring (2010) to move together. Thus, the compression spring (2011) is compressed. Reverse pressure is applied through the resilience generated by the compression spring (2011), thereby ensuring that the vacuum suction cup (209) is fully attached to the surface of the zinc-aluminum sprayed flat tube to ensure the airtightness between the vacuum suction cup (209) and the zinc-aluminum sprayed flat tube. As the micro-cylinder sleeve (205) continues to move downward, under the connection of the piston (2012) and the push rod (2013), the L-shaped bracket (2014) and the pin (2015) are driven to move downward together, making the pin (2015) gradually approach the top of the guide bar (2018). When the pin (2015) moves to the top of the guide bar (2018), the outer wall of the pin (2015) first contacts the top inclined guide surface (2019). When the pin (2015) continues to move downward, a wedging force in the direction approaching the micro-cylinder sleeve (205) is generated on the pin (2015) through the inclined guide surface (2019). Thus, under the connection of the L-shaped bracket (2014) and the push rod (2013), the piston (2012) is pushed to move away from the telescopic tube (206), compressing and storing energy in the return spring (2016). During the movement, the return spring (2016) generates negative pressure in the area to the left of the piston (2012) inside the micro-cylinder sleeve (205) and transmits it to the inside of the vacuum suction cup (209) through the sliding air needle (208). Thus, the vacuum suction cup (209) is firmly adsorbed on the outer surface of the zinc-aluminum sprayed flat tube to traction the zinc-aluminum sprayed flat tube to move downward; S3: By loosening the bolts that fix the upper extrusion seat (30101) and the extrusion base (30102), the upper extrusion seat (30101) can be removed from the top of the extrusion base (30102), and then the extrusion grooved pulley (302) can be removed. Other extrusion grooved pulleys (302) of different specifications can be replaced to press zinc-aluminum flat tubes of different models. After replacing the extrusion grooved pulley (302), install the upper extrusion seat (30101) on the top of the extrusion base (30102) and fix it again with bolts.

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