Fin tube continuous processing device

Abstract

The present invention relates to a fin tube continuous processing device, which includes a drawing die aligned with the axis of the tube to be processed with fins, the drawing die fixes a floating block inside the tube, the floating block has a free end and the free end is connected to a connecting rod, the downstream end of the connecting rod is connected to an inner core head with a surface provided with textures and can rotate freely around the axis of the tube, and is characterized in that: a blade for rolling the outer fin is provided on the radial outer side of the inner core head, the blade can rotate around the axis of the inner core head, and the blade itself is also rotatable, and a gap is formed between the blade and the inner core head to accommodate the wall of the tube, so that the blade and the inner core head can simultaneously roll the outer surface and inner surface of the tube wall to form the outer fin and the inner fin. The inner and outer fins can be processed continuously.

Description

Technical Field

[0001] The invention relates to a fin tube continuous processing device, which is used for processing fins on the surface of a tube. Background Art

[0002] Finned tubes can be used in heat exchange components such as evaporators and condensers in air conditioning devices.

[0003] The main method of forming fins on the inner and outer wall surfaces of a finned tube at the same time is spinning, such as the device disclosed in the Chinese patent document "CN1428211A". This device is to place an inner core head with a threaded surface inside the tube, and use a rotating blade group outside the tube. The gap between the blade group and the inner core head accommodates the wall of the tube, and the outer and inner fins are formed simultaneously by squeezing the outer and inner surfaces of the tube wall. The unfortunate thing about this method is that the length of the processed finned tube is limited. After processing a short finned tube, the tube needs to be fed again, so the processing efficiency is not high. This is because the inner core head located in the tube needs to have a place to attach. Generally, the inner core head is connected to the external attachment backwards through a connecting rod. The single tube to be processed is inserted into the inner core head from the front end to the back, and then the rolling is started to make the tube "spit out" forward to complete the rolling of the inner and outer fins.

[0004] There is a method for continuously processing inner fins, such as the device disclosed in the Chinese patent document "CN1100348A". It suspends the inner core head (grooved chuck) on a floating block (floating chuck) located inside the pipe, and the floating block is used to limit the movement of the variable diameter drawing die (clamping die). Ball bearings are set on the periphery of the inner core head used for rolling the inner fins, and the balls squeeze the wall of the pipe into the groove in the inner core head to form the inner fins. However, only inner fins can be processed, and outer fins cannot be processed.

[0005] There are also existing methods for continuously processing external fins, such as the device disclosed in the Chinese patent document "CN1891366A". The pipe is continuously fed, and a cutter is arranged to rotate on the outer circumference of the pipe. The cutter cuts spiral grooves on the outer surface of the pipe to form fins. However, only external fins can be processed, and internal fins cannot be processed.

[0006] Reference patent literature:

[0007] Patent 1, CN1428211A, seamless heat exchanger tube with structures on both sides and its manufacturing method, published on July 9, 2003;

[0008] Patent 2, CN1100348A, device for grooving a catheter, published on March 22, 1995;

[0009] Patent 3, CN1891366A, equipment for manufacturing integrated finned tubes for heat exchangers, published on January 10, 2007. Summary of the invention

[0010] The purpose of the present invention is to provide a fin tube continuous processing device, which solves the problem of how to continuously process inner and outer fins.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] The present invention provides a fin tube continuous processing device, which includes a drawing die aligned with the axis of the tube to be processed with fins, the drawing die fixes a floating block inside the tube, the floating block has a free end and the free end is connected to a connecting rod, the downstream end of the connecting rod is connected to an inner core head with a surface provided with textures and which can rotate freely around the axis of the tube, and is characterized in that a blade for rolling outer fins is provided on the radial outer side of the inner core head, the blade can rotate around the axis of the inner core head, and the blade itself is also rotatable, a gap is formed between the blade and the inner core head to accommodate the wall of the tube, so that the blade and the inner core head can simultaneously roll the outer surface and inner surface of the tube wall to form outer fins and inner fins.

[0013] Preferably, a plurality of blades are arranged in the axial direction, a group is formed between the plurality of blades, and the plurality of blades are distributed within the length range of the inner core head, and different patterns are arranged on the outer edges of the blades.

[0014] Furthermore, a plurality of groups of blades are arranged around the inner core head.

[0015] Furthermore, the plurality of blade groups are evenly distributed on the circumference.

[0016] Preferably, a pulling mechanism for pulling the pipe is also provided in the space between the drawing die and the inner core head.

[0017] Preferably, a winding disk and a straightening machine are also provided upstream of the drawing die. The straightening machine is provided between the winding disk and the drawing die to straighten the tube released from the winding disk. A sawing mechanism for sawing the tube is provided downstream of the blade and the inner core head.

[0018] Preferably, the blade is entirely arranged on the floating guide rail.

[0019] Furthermore, a pulling mechanism for pulling the pipe is provided in the space between the drawing die and the inner core head, and the pulling speed of the pulling mechanism is adjusted according to the displacement of the blade as a whole on the floating guide rail.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] The fin tube continuous processing device of the present invention can simultaneously process inner and outer fins through the cooperation of the blade and the inner core head, and because the inner core head is connected to the floating block through a connecting rod, and the floating block is restricted in movement by the drawing hard die, that is, the floating block can be braked without being fixedly connected to an external attachment mechanism, which makes it possible to continuously transport the tube between the blade and the inner core head to roll the inner and outer fins, realizing continuous processing, thereby greatly improving production efficiency.

[0022] Compared with the solution disclosed in the background "CN1100348A", although the applicant only replaced the ball bearing with a blade, the technical problem solved has undergone a qualitative change, and the new device can continuously and simultaneously process the inner and outer fins. This is a breakthrough in the conventional thinking in the "CN1100348A" scenario, because according to conventional thinking, in order to support the rolling of the inner core head, a rolling part needs to be set on the outside of the pipe wall, and the outer wall of the pipe is supported by the rolling part rotating around the pipe, and this rolling part is often a ball bearing, because the ball bearing can roll well on the outer wall of the pipe. Attempts to replace it with rollers, slip rings, etc. are not feasible, but replacing it with a blade solves a new technical problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 yes Figure 1 A magnified view of point B;

[0027] Figure 4 It is a schematic diagram of the principle of rolling inner and outer fins;

[0028] The reference numerals are described as follows:

[0029] 1. Winding plate;

[0030] 2. Straightening machine;

[0031] 3. Drawing hard die;

[0032] 4. Floating block;

[0033] 5. Pulling mechanism;

[0034] 6. Fin spinning mechanism; 61. Inner core head; 62. Blade;

[0035] 7. Sawing mechanism;

[0036] 8. Unloading mechanism;

[0037] 9. Connecting rod;

[0038] 10. Pipes;

[0039] 11. Floating guide rail. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1 The fin tube continuous processing device shown includes a winding disk 1, a straightening machine 2, a drawing die 3, a floating block 4, a pulling mechanism 5, a fin spinning mechanism 6, a sawing mechanism 7 and a feeding mechanism 8. Among them, a tube 10 is wound in the winding disk 1, and the tube 10 is fed to the straightening machine 2 to be straightened, and then the diameter is reduced (the diameter becomes smaller) under the joint action of the drawing die 3 and the floating block 4. The pulling mechanism 5 pulls the tube 10 to the right through the friction force with the outer peripheral surface of the tube 10. The pulling mechanism 5 in this example is a chain stretching machine. Then, the fin spinning mechanism 6 is used to extrude fins on the inner and outer walls of the tube 10, and the sawing mechanism 7 cuts the fin tube to a fixed length, and the feeding mechanism 8 feeds the tube.

[0044] Figure 2 yes Figure 1 The enlarged picture of point A is as follows: Figure 2As shown, the drawing die 3 has a truncated cone-shaped opening facing the incoming material direction, and the outer peripheral surface of the floating block 4 has a shape matching the truncated cone-shaped opening. The drawing die 3 serves as an outer die, and the floating block 4 serves as an inner die to change the diameter of the tube 10. The floating block 4 is braked in an appropriate position by the drawing die 3. The main purpose of the drawing die 3 is to fix the floating block 4 so that the floating block 4 can suspend the inner core head 61.

[0045] The right end of the floating block 4 is a free end, to which a connecting rod 9 is connected, and the downstream end of the connecting rod 9 (downstream in the direction of travel of the pipe) is connected to the inner core head 61. Figure 3 , Figure 3 yes Figure 1 In the enlarged view of the B position, the surface of the inner core head 61 is spirally patterned (or may be patterns of other shapes), and a blade 62 is disposed radially outward of the inner core head 61. Figure 4 The blades 62 are provided in three groups, and the three groups of blades 62 are distributed on the circumference around the inner core head 61. The blades in the three groups of blades 62 are rotatable, and the three groups of blades 62 are driven by a driving mechanism (not shown) to rotate around the pipe 10 in the c direction, that is, revolution plus rotation, rolling out the outer fins on the outer surface of the pipe 10 wall. The inner core head 61 is squeezed by the wall of the pipe 10, rolling out the inner fins on the inner surface of the wall. The inner core head 61 is free to rotate, and the rotation force of the inner core head 61 is provided by the pulling mechanism 5 (see Figure 1 )’s pulling force.

[0046] like Figure 1 , the three sets of blades 62 are integrally slidably arranged on the floating guide rail 11. In actual production conditions, the pulling speed of the pulling mechanism 5 may not match the rotary cutting speed of the blades 62. The sliding of the three sets of blades 62 on the floating guide rail 11 can eliminate the speed mismatch between the two. In this example, the displacement of the three sets of blades 62 on the floating guide rail 11 is also fed back to the pulling mechanism 5, and the pulling speed of the pulling mechanism 5 is adjusted according to the displacement. For example Figure 1 When the blade 62 slides to the right on the floating guide rail 11, it indicates that the pulling speed of the pulling mechanism 5 is too fast, and the pulling speed of the pulling mechanism 5 needs to be reduced; when the blade 62 slides to the left on the floating guide rail 11, it indicates that the pulling speed of the pulling mechanism 5 is too slow, and the pulling speed of the pulling mechanism 5 needs to be increased until the blade 62 is stationary on the floating guide rail 11 without sliding.

[0047] Or in another way, the initial position of the blade 62 as a whole can be set on the floating guide rail 11 as zero position, and the displacement when the blade 62 as a whole moves to the right is positive, and the displacement when the blade 62 as a whole moves to the left is negative. When the displacement is positive, the pulling speed of the pulling mechanism 5 is reduced until the blade 62 as a whole returns to zero position. When the displacement is negative, the pulling speed of the pulling mechanism 5 is increased until the blade 62 as a whole returns to zero position.

[0048] The difference between the above two methods is that in the former method, the blade 62 as a whole is stationary on the floating guide rail 11; in the latter method, the blade 62 as a whole needs to return to the zero position and be stationary.

[0049] like Figure 3 Each set of blades 62 includes three blades 62 distributed in the axial direction. The three blades 62 are arranged on the same rotating shaft and distributed within the length range of the inner core head 61. The textures of the outer edges of the blades 62 are different. The texture of the left blade 62 is a thread, so that a thread-shaped fin is rolled out on the outer surface of the tube; the texture of the middle blade 62 is an oblique rib distributed at intervals, so that transverse grooves are carved at intervals on the outer edge of the fin; the outer edge of the right blade 62 has no texture and is a smooth plane, so that the portion between adjacent grooves on the outer edge of the fin is bent to one side or both sides.

[0050] To sum up, in the fin tube continuous processing device of this example, the pulling mechanism 5 pulls the tube and continuously discharges the material from the winding disk 1. After the tube changes diameter through the drawing die 3, it passes through the pulling mechanism 5 and reaches the fin spinning mechanism 6. The blade 62 and the inner core head 61 in the fin spinning mechanism 6 roll on the outer surface and the inner surface of the tube wall to form the outer fin and the inner fin. Then the sawing mechanism 7 cuts the tube into the required length and the tube is unloaded by the unloading mechanism 8.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A fin tube continuous processing device, comprising a drawing die (3) aligned with the axis of the tube to be processed with fins, the drawing die (3) fixing a floating block (4) inside the tube, the floating block (4) having a free end and connected to a connecting rod (9), the downstream end of the connecting rod (9) connected to an inner core head (61) with a surface provided with textures and freely rotatable around the axis of the tube, characterized in that: A blade (62) for rolling outer fins is arranged on the radial outer side of the inner core head (61). The blade (62) can rotate around the axis of the inner core head (61). The blade (62) itself is also rotatable. A gap is formed between the blade (62) and the inner core head (61) to accommodate the wall of the tube, so that the blade (62) and the inner core head (61) can simultaneously roll the outer surface and the inner surface of the tube wall to form outer fins and inner fins. The blade (62) is arranged as a whole on the floating guide rail (11). A pulling mechanism (5) for pulling the tube is also arranged in the space between the drawing die (3) and the inner core head (61). The pulling speed of the pulling mechanism (5) is adjusted according to the displacement of the blade (62) as a whole on the floating guide rail (11).

2. The fin tube continuous processing device according to claim 1, characterized in that: A plurality of blades (62) are arranged in the axial direction, and the plurality of blades (62) form a group. The plurality of blades (62) are distributed within the length range of the inner core head (61), and the outer edges of the blades (62) are provided with different patterns.

3. The fin tube continuous processing device according to claim 2, characterized in that: A plurality of groups of blades (62) are arranged around the inner core head (61).

4. The fin tube continuous processing device according to claim 3, characterized in that: The plurality of blade groups (62) are evenly distributed on the circumference.

5. The fin tube continuous processing device according to claim 1, characterized in that: A winding disc (1) and a straightening machine (2) are also provided upstream of the drawing die (3). The straightening machine (2) is provided between the winding disc (1) and the drawing die (3) to straighten the pipe released from the winding disc (1). A sawing mechanism (7) for sawing the pipe is provided downstream of the blade (62) and the inner core head (61).

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