Finned tube bending machine

Abstract

The present invention provides a fin tube bending machine including: a machine base, a bending swing arm, a follower slide and an angle positioning assembly. A turntable and a bending die are arranged on the machine base, the bending swing arm is connected to the turntable, and the turntable is used to drive the bending die and the bending swing arm to rotate synchronously; the follower slide is slidably arranged on the machine base, and a first clamping block is arranged on the follower slide; the angle positioning assembly includes a guide rod, a bearing plate, a positioning plate and a limiting shaft, the guide rod is arranged on the bending swing arm, the guide rod passes through the bearing plate, the positioning plate is arranged on the bearing plate, and an inclined surface is arranged on the positioning plate. The turntable, the bending swing arm and the follower slide cooperate to bend the part of the fin tube that contacts the bending die into a "U" shape, and the inclined surface cooperates with the limiting shaft to provide angle guidance for the part of the fin tube that completes the bending, so that the bending machine can continuously bend the fin tube, thereby reducing the welding parts in the heat converter, improving the assembly efficiency and air tightness of the heat converter, and reducing the difficulty of maintenance.

Description

Technical Field

[0001] The invention relates to the field of metal processing, in particular to a fin tube bending machine. Background Art

[0002] like Figure 1 The heat exchanger body 20 shown in the figure is provided with two end plates 21, and a plurality of interconnected fin tubes 22 are provided between the two end plates 21, and each fin tube 22 is connected end to end. Specifically, in two adjacent fin tubes 22, the outlet end 22a of one fin tube 22 is connected to the inlet end 22b of the other fin tube 22. The bottom view thereof is as shown in FIG. Figure 3 As shown, two adjacent fin tubes 22 are parallel and staggered, and an angle of 45° exists between a line connecting the outlet end 22a of one fin tube 22 and the inlet end 22b of the other fin tube 22 and a line connecting the two ends of the fin tube 22 .

[0003] The existing fin tube 22 assembly method is as follows:

[0004] When assembling the heat exchanger, the fin tube 22 needs to be bent into an "n" shape by a bending machine. Figure 2 As shown, an "n"-shaped fin tube 22 is fixed on an end plate 21, and a U-shaped bend tube 23 is welded between two adjacent fin tubes 22 to connect the fin tubes 22 end to end, forming an "M"-shaped bend tube structure after welding.

[0005] Two adjacent fin tubes 22 form an "M"-shaped curved tube structure, which has a first curved portion 31, a second curved portion 32 (i.e., the location of the U-shaped curved tube 23) and a third curved portion 33. Figure 3 As shown, the first bend 31 and the third bend 33 are parallel and offset, that is, the first bend 31 and the third bend 33 are parallel and not on the same plane, and the angle between the second bend 32 and the first bend 31 (or the third bend 33) is 45°.

[0006] It can be seen that the fin tubes 22 are connected by welding. The heat converter assembled in this way has the following problems:

[0007] 1. Adjacent fin tubes 22 need to be welded, resulting in low assembly efficiency of the heat converter body 20, and poor sealing problems are prone to occur at the connection between the fin tube 22 and the U-shaped bend tube 23. The more welding parts there are, the greater the incidence of poor airtightness;

[0008] 2. During maintenance, each welding part needs to be checked, which makes maintenance difficult. Summary of the invention

[0009] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fin tube bending machine that can provide angle positioning for the fin tubes during the bending process, reduce the welding parts required between the fin tubes, so as to improve the assembly efficiency and air tightness of the heat converter body and reduce the difficulty of maintenance.

[0010] The objective of the present invention is achieved through the following technical solutions:

[0011] A fin tube bending machine comprises: a machine base, a bending swing arm, a follower slide and an angle positioning component;

[0012] A turntable and a bending die are arranged on the machine base, the bending swing arm is connected to the turntable, and the turntable is used to drive the bending die and the bending swing arm to rotate synchronously;

[0013] The follow-up slide is slidably arranged on the machine base, and a first clamping block is arranged on a side of the follow-up slide close to the bending die;

[0014] The angle positioning assembly includes a guide rod, a bearing plate, a positioning plate and a limit shaft. The guide rod is arranged on the bending swing arm, and the guide rod passes through the bearing plate. The positioning plate is arranged on the side of the bearing plate close to the turntable. The positioning plate is provided with an inclined surface, and the limit shaft is located on the inclined surface.

[0015] In one embodiment, the angle between the inclined surface and the horizontal plane is 45°.

[0016] In one of the embodiments, a fixing sleeve is provided on the supporting plate at the connection position with the guide rod.

[0017] In one embodiment, the guide rod has a hexagonal cross section, and the fixing sleeve is provided with a hexagonal through hole matching the guide rod.

[0018] In one of the embodiments, a stop screw is provided on the fixing sleeve, and the stop screw abuts against the outer wall of the guide rod.

[0019] In one of the embodiments, the base is provided with a supporting frame.

[0020] In one of the embodiments, a second clamping block is provided on a side of the bending swing arm close to the bending die.

[0021] In one of the embodiments, the bending swing arm and the follower slide are both provided with a cylinder, and the cylinder is used to drive the first clamping block or the second clamping block to approach or move away from the bending die.

[0022] In one embodiment, the follower slide is provided with a slide plate, and the first clamping block and the cylinder are both provided on the slide plate.

[0023] In one of the embodiments, an adjustment seat is provided on one end of the guide rod connected to the bending swing arm.

[0024] In summary, the turntable, bending swing arm and follow-up slide cooperate to bend the part of the fin tube that contacts the bending die into a "U" shape. The inclined surface and the limit axis cooperate to provide angle guidance for the bent part of the fin tube, so that the bending machine can continuously bend the fin tube, thereby reducing the parts that need to be welded in the heat converter, improving the assembly efficiency and air tightness of the heat converter, and reducing the difficulty of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic diagram of the structure of a heat converter;

[0027] Figure 2 is a structural schematic diagram of a fin tube;

[0028] Figure 3 for Figure 2 A bottom view of the finned tube shown;

[0029] Figure 4 It is a structural schematic diagram of a fin tube bending machine in an initial state in one embodiment;

[0030] Figure 5 for Figure 4 A schematic diagram of the fin tube bending machine from another perspective is shown;

[0031] Figure 6 for Figure 5 The schematic diagram of the state of the fin tube bending machine after the bending action is performed;

[0032] Figure 7 It is a top view of the fin tube bending machine in the initial state;

[0033] Figure 8 A top view of the fin tube bending machine in the bending action state;

[0034] Fig. 9 It is a structural schematic diagram of the angle positioning component;

[0035] Fig.10 is a schematic diagram of the cooperation between the first bending portion and the angle positioning assembly;

[0036] Fig.11 It is a schematic diagram of the cooperation between the angle positioning assembly and the fin tube when processing the second bending portion;

[0037] Fig.12 is a schematic diagram of the cooperation between the second bending portion and the angle positioning assembly;

[0038] Fig.13 And a schematic diagram of the cooperation between the angle positioning assembly and the fin tube when processing the third bending portion.

[0039] Reference numerals

[0040] Fin tube bending machine 10, heat converter body 20, end plate 21, fin tube 22, outlet end 22a, inlet end 22b, U-shaped bend 23, first bend 31, second bend 32, third bend 33, machine base 100, turntable 110, bending die 120, support frame 130, bending swing arm 200, second clamping block 210, follow-up slide 300, first clamping block 310, slide plate 320, angle positioning assembly 400, guide rod 410, bearing plate 420, fixing sleeve 421, positioning plate 430, inclined surface 431, limiting shaft 440, adjustment seat 450, cylinder 500. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] See also Figure 4 and Figure 5The present invention provides a fin tube bending machine 10, including: a machine base 100, a bending swing arm 200, a follower slide 300 and an angle positioning assembly 400.

[0045] It should be noted that the fin tube bending machine 10 cooperates with the bending swing arm 200, the follower slide 300 and the angle positioning assembly 400 to process the U-shaped bend 23 by bending instead of welding. Figure 2 The "M"-shaped fin tube 22 shown in the figure has a first bend 31, a second bend 32 and a third bend 33, wherein the first bend 31 is parallel to the third bend 33 and is offset, that is, the first bend 31 is parallel to the third bend 33 and is not on the same plane, as shown in FIG. Figure 3 As shown, there is an angle between the second curved portion 32 and the first curved portion 31 (or the third curved portion 33 ).

[0046] See also Figure 4 and Figure 5 A turntable 110 and a bending die 120 are disposed on the machine base 100, and a bending swing arm 200 is connected to the turntable 110. The turntable 110 is used to drive the bending die 120 and the bending swing arm 200 to rotate synchronously. A follower slide 300 is slidably disposed on the machine base 100, and a first clamping block 310 is disposed on one side of the follower slide 300 close to the bending die 120.

[0047] The bending die 120 is located on the top of the turntable 110, and the rotation center of the turntable 110 coincides with the center line of the bending die 120, that is, when the turntable 110 is started, the bending die 120 rotates at its installation position;

[0048] See also Figure 5 and Figure 7 In the initial state, the bending swing arm 200 and the follower slide 300 are located on the same side of the turntable 110. Figure 7 As shown, the space between the bending die 120, the bending swing arm 200 and the follower slide 300 is the feeding position of the fin tube 22 to be processed;

[0049] See also Figure 6 and Figure 8 After the turntable 110 is started, the bending swing arm 200 will be turned over, so that the bending swing arm 200 swings to the other side of the turntable 110. Figure 8 As shown, at this time, the bending swing arm 200 and the follower slide 300 are arranged opposite to each other, and the bending swing arm 200 and the follower slide 300 are respectively located on both sides of the bending die 120, bending the fin tube 22 to be processed to form the first bending portion 31 (or the second bending portion 32, the third bending portion 33).

[0050] The plane where the swing track of the bending swing arm 200 is located is parallel to the horizontal ground. That is, during the bending operation, the bending swing arm 200 swings parallel to the horizontal ground.

[0051] See also Figure 7 and Figure 8 When the fin tube 22 is subjected to the bending operation, the bending swing arm 200 and the follower slide 300 are both translated toward a position close to the bending die 120 to apply a clamping force to the fin tube 22 to be processed. The first clamp block 310 and the bending swing arm 200 are in contact with one side of the fin tube 22 to be processed, and the bending die 120 is in contact with the other side of the fin tube 22 to be processed. Preferably, a second clamp block 210 is provided on the side of the bending swing arm 200 close to the bending die 120. When the clamping force is applied to the fin tube 22 to be processed, the second clamp block 210 abuts against the outer wall of the fin tube 22. The first clamp block 310 and the second clamp block 210 are both provided with grooves matching the fin tube 22 (such as Figure 5 As shown), the contact area with the outer wall of the fin tube 22 is increased to improve the clamping force.

[0052] See also Figure 5 and Figure 6 Preferably, the bending swing arm 200 and the follower slide 300 are both provided with a cylinder 500, and the cylinder 500 is used to drive the first clamping block 310 or the second clamping block 210 to approach or move away from the bending die 120. That is, the bending swing arm 200 and the follower slide 300 are driven by the cylinder 500 to approach or move away from the bending die 120, so as to clamp or release the fin tube 22 to be processed.

[0053] See also Fig. 9 The angle positioning assembly 400 includes a guide rod 410, a bearing plate 420, a positioning plate 430 and a limiting shaft 440. The guide rod 410 is arranged on the bending swing arm 200, the guide rod 410 passes through the bearing plate 420, the positioning plate 430 is arranged on the side of the bearing plate 420 close to the turntable 110, the positioning plate 430 is provided with an inclined surface 431, and the limiting shaft 440 is located on the inclined surface 431.

[0054] See also Figure 5 Preferably, an adjustment seat 450 is provided on one end of the guide rod 410 connected to the bending swing arm 200. The guide rod 410 is fixed to the outer wall of the bending swing arm 200 through the adjustment seat 450.

[0055] like Figure 6 As shown, the guide rod 410 is located on the side of the bending swing arm 200 away from the follower slide 300, and the bearing plate 420 is a blocking component in the extending direction of the guide rod 410, providing an axial limit for the fin tube 22 to be processed, so as to prevent the fin tube 22 to be processed from axially deviating;

[0056] When processing the second curved portion 32 (or the third curved portion 33), the first curved portion 31 (or the second curved portion 32) is hooked on the limiting shaft 440, and the limiting shaft 440 limits the first curved portion 31 (or the second curved portion 32). The limiting shaft 440 cooperates with the bearing plate 420 to provide axial limiting during the processing of the second curved portion 32 (or the third curved portion 33), so as to prevent the fin tube 22 to be processed from axial deviation.

[0057] The inclined surface 431 on the positioning plate 430 has an angle with the horizontal ground, and the angle is consistent with the angle between the second bend 32 and the first bend 31, that is, the angle between the inclined surface 431 and the horizontal plane is 45°; during the processing of the second bend 32 (or the third bend 33), the inclined surface 431 provides angle positioning for the first bend 31 (or the second bend 32), ensuring that the angle between the second bend 32 and the first bend 31 (or the third bend 33) after bending meets the assembly requirements.

[0058] The working principle of the above-mentioned fin tube bending machine 10 is introduced below:

[0059] The fin tube 22 to be processed is a straight tube. The fin tube 22 to be processed is placed in the feeding space between the bending die 120 and the bending swing arm 200 so that the end of the fin tube 22 to be processed fits with the carrying plate 420.

[0060] See also Figure 7 The fin tube bending machine 10 is started, the bending swing arm 200 and the follower slide 300 are close to the bending die 120, and the fin tube 22 to be processed is pressed against the outer wall of the bending die 120. At this time, the first clamping block 310 on the bending swing arm 200, the bending die 120 and the follower slide 300 is in contact with the fin tube 22 to be processed;

[0061] The turntable 110 starts to rotate, and drives the bending swing arm 200 and the bending die 120 to rotate synchronously. The contact part of the fin tube 22 to be processed with the bending swing arm 200 is bent as the bending swing arm 200 swings. When the bending swing arm 200 swings to the other side of the bending die 120, the fin tube 22 forms a "U"-shaped structure on the outer side of the bending die 120. The first bending portion 31 is processed. The bending swing arm 200 and the follower slide 300 are away from the bending die 120. After the fin tube 22 is removed, the turntable 110 starts to rotate and reverse, and the bending swing arm 200 and the bending die 120 return to their initial state.

[0062] See also Figure 7 and Figure 8It should be noted that, during the above-mentioned bending process, the bending swing arm 200 swings from one side of the turntable 110 to the other side of the turntable 110, and bends the fin tube 22. During bending, the fin tube 22 is pulled to translate axially, and the follower slide 300 is driven to slide, so as to avoid damaging the fin tube 22. That is, the follower slide 300 is a driven component, and during the bending process of the fin tube 22, the first clamping block 310 is used to keep the fin tube 22 in close contact with the bending die 120, and provide protection for the fin tube 22.

[0063] Next, re-clamp the fin tube 22, and hook the first curved portion 31 on the limiting shaft 440, so that the first curved portion 31 is in contact with the inclined surface 431 on the positioning plate 430. At this time, the matching state of the fin tube 22 and the angle positioning assembly 400 is as follows: Fig.10 As shown, in this state, the angle between the first curved portion 31 and the horizontal ground is 45°;

[0064] The fin tube bending machine 10 is started again, and the bending swing arm 200 and the follower slide 300 press the upper and lower portions to be bent of the fin tube 22 onto the outer wall of the bending die 120;

[0065] The turntable 110 drives the bending arm 200 and the bending die 120 to rotate synchronously, and the contact part of the fin tube 22 with the bending arm 200 is bent as the bending arm 200 swings, forming a "U"-shaped structure on the outer side of the bending die 120, and the second bending portion 32 is processed. The matching state of the fin tube 22 and the angle positioning assembly 400 is entered. Fig.11 As shown, at this time, the angle between the second curved portion 32 and the first curved portion 31 is 45° (as shown in FIG. Figure 3 shown);

[0066] Repeat the above material removal operation, remove the fin tube 22 from the fin tube bending machine 10 again, and prepare for the third bending action after the bending swing arm 200 and the bending die 120 are reset;

[0067] The second curved portion 32 is hooked on the limiting shaft 440, so that the first side surface 32a of the second curved portion 32 is in contact with the inclined surface 431 of the positioning plate 430. At this time, the matching state of the fin tube 22 and the angle positioning assembly 400 is as follows: Fig.12 As shown, in this state, the first bending portion 31 is parallel to the horizontal ground, that is, the first bending portion 31 is in a state parallel to the plane where the swing trajectory of the bending swing arm 200 is located.

[0068] Repeat the above bending action, the turntable 110 drives the bending swing arm 200 and the bending die 120 to rotate synchronously again, and bends the part of the fin tube 22 that contacts the bending swing arm 200 to form a third bending portion 33. At this time, the matching state of the fin tube 22 and the angle positioning assembly 400 is as shown in FIG. Fig.13As shown, through the positioning of the inclined surface 431 , the third curved portion 33 is parallel to the first curved portion 31 , and the third curved portion 33 forms an angle of 45° with the second curved portion 32 .

[0069] Finally, the fin tube 22 is taken out, and the turntable 110 drives the bending swing arm 200 and the bending die 120 to reset, and the bending process of the fin tube 22 is completed.

[0070] The turntable 110, the bending swing arm 200 and the follower slide 300 cooperate to bend the portion of the fin tube that contacts the bending die 120 into a "U" shape, instead of connecting the fin tube 22 by welding the U-shaped bent tube 23 in the original solution, thereby reducing the welding portions required on each fin tube 22 in the heat converter body 20. The fin tube 22 only needs to be repeatedly clamped and bent, which is beneficial to improving the assembly efficiency of the heat converter body 20.

[0071] During the bending action of the bending swing arm 200 and the bending die 120, the inclined surface 431 cooperates with the limit shaft 440 to provide angle guidance for the bent portion on the fin tube to ensure that the angles between the first bend 31, the second bend 32 and the third bend 33 meet the assembly standard. Multiple bending portions are formed by bending the same straight rod fin tube 22 to form an integrated structure. Compared with the welded structure composed of multiple fin tubes 22 and U-shaped bends 23 in the original solution, the bent fin tube 22 has higher sealing performance, which is beneficial to improving the air tightness of the heat converter body 20.

[0072] See also Fig.10 In one embodiment, a fixing sleeve 421 is provided at the connection position between the carrier plate 420 and the guide rod 410, and the fixing sleeve 421 can be used to adjust the fixed position of the carrier plate 420 on the guide rod 410. By moving the fixing sleeve 421, the carrier plate 420 can slide along the axial direction of the guide rod 410. Further, a stop screw is provided on the fixing sleeve 421, and the stop screw abuts against the outer wall of the guide rod 410. When the stop screw is tightened, the stop screw abuts against the outer wall of the guide rod 410, providing friction to lock the fixing sleeve 421 on the guide rod 410; when the stop screw is loosened, the locking of the fixing sleeve 421 can be released, and applying force to push the fixing sleeve 421 can make the carrier plate 420 slide along the axial direction of the guide rod 410, so that the adjustment of the fixed position of the carrier plate 420 is more flexible.

[0073] Preferably, the cross-section of the guide rod 410 is hexagonal, and a hexagonal through hole matching the guide rod 410 is opened on the fixing sleeve 421. After the guide column 410 is passed through the fixing sleeve 421, the fixing sleeve 421 can be prevented from rotating relative to the guide column 410, that is, the bearing plate 420 can be prevented from rotating relative to the guide column 410, thereby ensuring that the positioning plate 430 will not deflect during the bending process, and ensuring the accuracy of the angle between the various bending parts after the fin tube 22 is bent.

[0074] See also Figure 4 In one embodiment, the base 100 is provided with a support frame 130. The turntable 110 is located between the support frame 130 and the guide rod. The portion of the fin tube 22 to be bent (or bent) is supported and positioned by the inclined surface 431 on the positioning plate 430 and the limit shaft 440; and the end of the fin tube 22 away from the portion to be bent (or bent) is supported by the support frame 130. The support frame 130 cooperates with the inclined surface 431 and the limit shaft 440 to support both ends of the fin tube 22, so as to prevent the fin tube 22 from tilting under the action of gravity during the bending process and improve the bending accuracy.

[0075] See also Figure 5 Preferably, the follower slide 300 is provided with a slide plate 320 , and the first clamping block 310 and the cylinder 500 are both arranged on the slide plate 320 .

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fin tube bending machine, characterized in that: include: Machine base, bending swing arm, follow-up slide and angle positioning components; A turntable and a bending die are arranged on the machine base, the bending swing arm is connected to the turntable, and the turntable is used to drive the bending die and the bending swing arm to rotate synchronously; The follower slide is slidably disposed on the machine base, and a first clamping block is disposed on a side of the follower slide close to the bending die, the first clamping block and the bending swing arm are in contact with one side of the fin tube to be processed, and the bending die is in contact with the other side of the fin tube to be processed; The angle positioning assembly includes a guide rod, a bearing plate, a positioning plate and a limiting shaft, wherein the guide rod is arranged on the bending swing arm, the guide rod passes through the bearing plate, the positioning plate is arranged on the side of the bearing plate close to the turntable, the positioning plate is provided with an inclined surface, and the limiting shaft is located on the inclined surface; The bearing plate is used to provide axial limitation for the fin tube to be processed so as to prevent the fin tube from axial deviation; the limiting shaft cooperates with the bearing plate to provide axial limitation for the curved portion on the fin tube.

2. The fin tube bending machine according to claim 1, characterized in that: The angle between the inclined surface and the horizontal plane is 45°.

3. The fin tube bending machine according to claim 1, characterized in that: A fixing sleeve is arranged on the bearing plate at the connection position with the guide rod.

4. The fin tube bending machine according to claim 3, characterized in that: The cross section of the guide rod is hexagonal, and the fixing sleeve is provided with a hexagonal through hole matching the guide rod.

5. The fin tube bending machine according to claim 3, characterized in that: The fixing sleeve is provided with a stop screw, and the stop screw abuts against the outer wall of the guide rod.

6. The fin tube bending machine according to claim 1, characterized in that: The machine base is provided with a supporting frame.

7. The fin tube bending machine according to claim 1, characterized in that: A second clamping block is arranged on one side of the bending swing arm close to the bending die.

8. The fin tube bending machine according to claim 7, characterized in that: The bending swing arm and the follower slide are both provided with a cylinder, and the cylinder is used to drive the first clamping block or the second clamping block to approach or move away from the bending die.

9. The fin tube bending machine according to claim 8, characterized in that: The follow-up slide is provided with a slide plate, and the first clamping block and the cylinder are both arranged on the slide plate.

10. The fin tube bending machine according to claim 1, characterized in that: An adjustment seat is arranged on one end of the guide rod connected to the bending swing arm, and the guide rod is fixed to the outer wall of the bending swing arm through the adjustment seat.

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