A punching mechanism for a J-shaped tube

Abstract

The present invention discloses a punching mechanism for a J-shaped tube. The J-shaped tube includes a straight tube section and a curved hook section. The punching mechanism includes a clamping die assembly and a punching assembly. The clamping die assembly is provided with a clamping and shaping structure capable of clamping the J-shaped tube and maintaining the J-shaped tube in a fixed shape. The clamping die assembly is also provided with an escape groove capable of exposing the inner portion of the free end of the curved hook section when the clamping die assembly clamps the J-shaped tube. The punching assembly includes an ejector pin, a punching needle, and a punching drive device. When driven by the punching drive device, the ejector pin is inserted into the interior of the curved hook section from an end thereof. The ejector pin is provided with a die hole that cooperates with the punching needle. When driven by the punching drive device, the punching needle can extend into the escape groove. After extending into the escape groove, the punching needle is driven by the punching drive device to move toward the J-shaped tube to punch a hole in the curved hook section of the J-shaped tube. The present invention can automatically punch the J-shaped tube while clamping, pressing, and shaping the J-shaped tube, thereby realizing automated processing and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of production of raw materials for heat exchangers, and in particular to a punching mechanism for a J-shaped tube. Background Art

[0002] As a compact heat exchanger, tube-fin heat exchanger is widely used in the refrigeration industry. Its main raw materials are copper tubes and fins.

[0003] In some special tube-fin heat exchangers, it is necessary to use Figure 1 The J-shaped tube 1 shown comprises a straight tube section 11 and a curved hook section 12, with a tube hole 101 defined on the inner side of the free end of the curved hook section 12. Currently, the method for producing such a J-shaped tube 1 is to first cut a straight tube of an appropriate length, then bend the straight tube against a bending film to form the J-shaped tube. Next, the ends of the J-shaped tube are shaped, and finally, a hole is punched in the J-shaped tube to form the J-shaped tube 1 with the tube hole 101.

[0004] This production method also has the following problems. First, since the punching position is on the inner side of the free end of the hook section, it is difficult to achieve automatic punching. Therefore, manual punching is generally used to punch holes in the J-tube, which has high labor costs. Second, since the copper tube itself has a certain elasticity, there will be a certain amount of rebound deformation after the J-tube is bent. In order to solve this problem, there is a common practice: when bending the J-tube, the bending angle is increased to reserve a margin for rebound deformation. However, since the rebound deformation of different J-tubes is different, the dimensional deviation of the J-tube is large and the yield rate is low. If the dimensional deviation of the J-tube is too large, it will have an adverse effect on the subsequent punching accuracy. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a punching mechanism that can automatically punch holes in a J-tube while clamping and shaping the J-tube.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A punching mechanism for a J-shaped tube, the J-shaped tube comprising a straight tube section and a curved hook section, the punching mechanism comprising a clamping die assembly and a punching assembly, the clamping die assembly being provided with a tube-shaping structure capable of clamping the J-shaped tube and maintaining the J-shaped tube in a fixed shape, the clamping die assembly being further provided with an escape groove capable of exposing the inner portion of the free end of the curved hook section when the clamping die assembly clamps the J-shaped tube, the punching assembly comprising an ejector pin, a punching needle, and a punching drive device, the ejector pin being driven by the punching drive device to punch the hole from the end of the curved hook section Inserted into the hook section, the ejector is provided with a die hole that cooperates with the punching needle. The punching needle can be extended into the avoidance groove when driven by the punching drive device. After the punching needle is extended into the avoidance groove, it is driven by the punching drive device to move toward the J-shaped tube to cooperate with the ejector to punch a hole in the hook section of the J-shaped tube. The clamping die assembly includes a first clamping module, a second clamping module located on the right side of the first clamping module, and a clamping die driver that can drive the relative movement of the two. A guide structure is provided between the first clamping module and the second clamping module.

[0008] As a preferred solution among the above technical solutions, the tube clamping shaping structure includes a J-shaped first clamping groove arranged on the right side wall of the first clamping module, and a J-shaped second clamping groove arranged on the left side wall of the second clamping module. When the first clamping module and the second clamping module are closed, a J-shaped hole for clamping and accommodating the J-shaped tube is formed between the first clamping groove and the second clamping groove.

[0009] As a preferred solution among the above technical solutions, the opening of the avoidance groove faces downward, and the J-shaped hole includes a straight hole section for clamping and accommodating the straight pipe section of the J-shaped tube and a curved hole section for clamping and accommodating the hook section of the J-shaped tube, and the inner curved part of the curved hole section away from the straight hole section is connected to the avoidance groove.

[0010] As a preferred solution of the above technical solution, the punching drive device includes a fixed seat, a lifting seat, a lifting drive arranged on the fixed seat and capable of driving the lifting seat to move up and down, a punching bracket capable of moving forward and backward on the lifting seat, and a punching drive arranged on the lifting seat and capable of driving the punching bracket to move forward and backward. The punching needle is arranged at the upper end of the punching bracket and the head of the punching needle faces backward. When the lifting seat moves upward, the punching needle extends upward into the avoidance groove. When the punching drive drives the punching needle to move backward in the avoidance groove, it punches a hole in the hook section of the J-shaped tube.

[0011] As a preferred solution in the above technical solution, both ends of the J-shaped hole are open downward, and the ejector pin is arranged on the lifting seat. When the lifting seat moves upward, the ejector pin is inserted upward into the interior of the hook section of the J-shaped tube.

[0012] As a preferred solution among the above technical solutions, the first clamping module is provided with an air guide hole communicating with the first clamping groove.

[0013] As a preferred solution among the above technical solutions, the second clamping module is provided with an air guide hole communicating with the second clamping groove.

[0014] As a preferred solution among the above technical solutions, both end openings of the J-shaped hole are facing downward, and a guide hole that can guide left and right is provided on the first clamping module, and the guide hole is located in the area surrounded by the first clamping groove. A receiving part is movably provided in the guide hole, and the top contour of the receiving part is parallel to the hook part of the first clamping groove, and the front side contour of the receiving part is parallel to the straight part of the first clamping groove. When the first clamping module and the second clamping module are opened, a vertical gap is formed between the first clamping module and the second clamping module for the J-shaped tube to enter, and the receiving part is connected to a receiving tube driver that can drive it to move into the vertical gap to receive the J-shaped tube.

[0015] As a preferred solution of the above technical solution, the guide structure includes a guide hole provided on the second clamping module along the left-right direction, and a guide rod provided on the first clamping module and slidingly engaged with the guide hole.

[0016] The beneficial effects of the present invention are as follows: when the present invention is applied to an automatic J-tube production line, the J-tube can be directly transferred to the clamping die assembly for punching after being bent in the bending mechanism. During the punching process, the J-tube is clamped by the clamping die assembly, which can remove residual stress in the J-tube during the bending process, shape the J-tube, and improve the dimensional accuracy of the J-tube. In addition, while the J-tube is being clamped and shaped, the punching assembly can automatically punch the J-tube, thereby achieving automated processing, high punching accuracy, and high dimensional accuracy of the formed J-tube. The two steps of clamping and punching the J-tube are performed simultaneously, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the finished J-tube;

[0018] Figure 2 It is a structural schematic diagram of the first working state of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the second working state of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the third working state of the present invention;

[0021] Figure 5 yes Figure 4 Enlarged view of part A;

[0022] Figure 6 This is a schematic diagram of the positional relationship between the two components before the J-tube enters the clamping assembly;

[0023] Figure 7 It is a schematic diagram of the structure when the J-tube falls onto the receiving piece;

[0024] Figure 8 It is a schematic diagram of the structure of the clamping die assembly in the closed state;

[0025] Figure 9 is an exploded view of the clamp assembly. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that all directional indications in the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0028] Reference Figures 1 to 9 The present invention proposes a punching mechanism for a J-shaped tube. The J-shaped tube 1 includes a straight tube section 11 and a hook section 12. The punching mechanism includes a clamping die assembly 2 and a punching assembly. The clamping die assembly 2 is provided with a clamping tube shaping structure that can clamp the J-shaped tube 1 and keep the J-shaped tube 1 in a fixed shape. The clamping die assembly 2 is also provided with an avoidance groove 201. When the J-shaped tube 1 is clamped on the clamping die assembly 2, the inner side of the free end of the hook section 12 is exposed in the avoidance groove 201. The punching assembly includes a hole. The punching needle 4 includes an ejector pin 3, a punching needle 4 and a punching drive device. When the ejector pin 3 is driven by the punching drive device, it is inserted into the interior of the hook segment 12 from the end of the hook segment 12. A die hole 31 cooperating with the punching needle 4 is provided on the ejector pin 3. When the punching needle 4 is driven by the punching drive device, it can be extended into the avoidance groove 201. After the punching needle 4 is extended into the avoidance groove 201, it is driven by the punching drive device to move toward the J-shaped tube 1 to cooperate with the ejector pin 3 to punch a hole in the inner part of the free end of the hook segment 12.

[0029] In a preferred embodiment of the clamping module 2, the clamping module 2 includes a first clamping module 21, a second clamping module 22 located on the right side of the first clamping module 21, and a clamping driver capable of driving the relative movement of the two. The tube clamping shaping structure includes a J-shaped first clamping groove 211 arranged on the right side wall of the first clamping module 21, and a J-shaped second clamping groove 221 arranged on the left side wall of the second clamping module 22. When the first clamping module 21 and the second clamping module 22 are closed, a J-shaped hole 202 for clamping and accommodating the J-shaped tube 1 is formed between the first clamping groove 211 and the second clamping groove 221.

[0030] The clamping die driver is preferably an electric push rod or a combination of a motor screw-nut pair, which can be connected to the first clamping module 21 to drive the first clamping module 21 to move left and right relative to the second clamping module 22, or connected to the second clamping module 22 to drive the second clamping module 22 to move left and right relative to the first clamping module 21, and can also be connected to two clamping modules at the same time to drive the first clamping module 21 and the second clamping module 22 to move synchronously in opposite directions to close or open the two.

[0031] Reference Figure 2 Specifically, the clamping die assembly 2 is located above the punching assembly, and the J-shaped hole 202 includes a straight hole section for clamping and accommodating the straight tube section 11 of the J-shaped tube 1 and a curved hole section for clamping and accommodating the hook section 12 of the J-shaped tube 1. Both end openings of the J-shaped hole 202 face downward, and the opening of the avoidance groove 201 faces downward. The portion of the curved hole section corresponding to the hook section 12, that is, the inner curved portion of the end of the curved hole section away from the straight hole section, coincides with the rear edge portion of the avoidance groove 201, so that the curved hole section and the avoidance groove 201 are conductive.

[0032] The punching drive device includes a fixed base 51, a lifting base 52, a lifting drive 53 disposed on the fixed base 51 and capable of driving the lifting base 52 to move up and down, a punching bracket 54 capable of moving back and forth on the lifting base 52, and a punching drive 55 disposed on the lifting base 52 and capable of driving the punching bracket 54 to move back and forth. The punching needle 4 is disposed at the upper end of the punching bracket 54 with the head of the punching needle 4 facing backward, and the ejector pin 3 is disposed on the lifting base 52. The lifting drive 53 is preferably a motor, which drives the lifting base 52 to move up and down through a screw-nut pair. The punching drive 55 is preferably a cylinder.

[0033] The method for punching a hole in a J-shaped tube 1 is as follows: when the J-shaped tube 1 is clamped and received in the clamp assembly 2, the lift actuator 53 drives the lift base 52 upward, causing the punching needle 4 to extend upward into the avoidance groove 201 and simultaneously inserting the ejector pin 3 upward into the interior of the hook section 12 of the J-shaped tube 1. Next, while the lift base 52 remains stationary, the punching actuator 55 drives the punching bracket 54 and the punching needle 4 backward within the avoidance groove 201, thereby punching the hole 101 in the hook section 12 of the J-shaped tube 1. The ejector pin 3 is also positioned on the lift base 52 to ensure that the ejector pin 3 is inserted into the hook section 12 before the punching needle 4 punches the hole. After the hole is punched, since the openings at both ends of the J-shaped tube 1 face downward, the waste material generated by the punching is automatically discharged downward under the action of gravity.

[0034] With the above solution, during the punching process, the J-shaped tube 1 is clamped by the clamping die assembly 2, which can remove residual stress during the bending process of the J-shaped tube 1, reshape the J-shaped tube 1, and improve the dimensional accuracy of the J-shaped tube 1. In addition, while the J-shaped tube 1 is being clamped and shaped, the punching assembly can automatically punch the J-shaped tube 1, realizing automated processing. The two steps are performed simultaneously, improving work efficiency.

[0035] Furthermore, the first clamping module 21 is provided with an air guide hole 203 that is in communication with the first clamping groove 211, and the second clamping module 22 is provided with an air guide hole 203 that is in communication with the second clamping groove 221. One end of the air guide hole 203 is connected to an external high-pressure air source through an air pipe, and the air pipe is provided with a solenoid valve. After the J-shaped tube 1 is punched, the punching assembly is withdrawn, and then the first clamping module 21 and the second clamping module 22 are separated, and a certain space is opened between them to form a vertical gap 204 for the J-shaped tube 1 to pass through. Then, the solenoid valve on the air pipe is opened, and air is injected into the first clamping groove 211 and the second clamping groove 221, so that the J-shaped tube 1 can be smoothly detached and fall from the vertical gap 204 between the first clamping module 21 and the second clamping module 22, realizing automatic unloading.

[0036] Reference Figure 7 and Figure 9The first clamping module 21 is provided with a guide hole 212 that can guide left and right. The guide hole 212 is located in the area surrounded by the first clamping groove 211. A receiving member 23 is movably disposed in the guide hole 212. The top profile of the receiving member 23 is parallel to the hook portion of the first clamping groove 211, and the front profile of the receiving member 23 is parallel to the straight portion of the first clamping groove 211. The receiving member 23 is connected to a connecting rod driver 24. When the first clamping module 21 and the second clamping module 22 are opened, the connecting rod driver 24 can drive it to move into the vertical gap 204 between the first clamping module 21 and the second clamping module 22 to receive the J-shaped tube 1. The connecting rod driver 24 is preferably a pneumatic cylinder. The method of loading the J-tube 1 into the clamping mold assembly 2 is: use a robot to grab the J-tube 1 that has been bent and formed, so that the openings at both ends of the J-tube 1 are facing downward, and at the same time, the first clamping module 21 and the second clamping module 22 are opened, and the receiving part 23 moves to the vertical gap 204 between the first clamping module 21 and the second clamping module 22, then, the robot grabs the J-tube 1 and moves it to the top of the vertical gap 204, and then the robot is released, allowing the J-tube 1 to fall freely onto the receiving part 23, and the J-tube 1 is preliminarily positioned by the receiving part 23, finally, the second clamping module 22 and the second clamping module 22 are closed, and at the same time, the receiving part 23 is recovered into the guide hole 212, and the J-tube 1 is clamped and fixed by the first clamping groove 211 and the second clamping groove 221.

[0037] In order to improve the smoothness of opening and closing of the clamping module 2 , a guide hole 222 arranged along the left-right direction is provided on the second clamping module 22 , and a guide rod 213 slidingly matched with the guide hole 222 is provided on the first clamping module 21 .

[0038] In some schemes of the clamping mold assembly 2, it may also adopt other structural forms. For example, a plurality of discontinuous clamping grooves may be used to clamp different positions of the J-shaped tube 1, thereby replacing the above-mentioned first clamping groove 211 and second clamping groove 221.

[0039] In some schemes of the punching assembly, other structural forms may also be adopted. For example, the above-mentioned lifting drive 53 and punching drive 55 are only used to drive the punching needle 4 to move, and the ejector 3 is driven to move up and down through an additional drive system.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A J-shaped tube punching mechanism, wherein the J-shaped tube (1) comprises a straight tube section (11) and a hook section (12), characterized in that: The punching mechanism comprises a clamping die assembly (2) and a punching die assembly. The clamping die assembly (2) is provided with a tube-forming structure capable of clamping the J-shaped tube (1) and keeping the J-shaped tube (1) in a fixed shape. The clamping die assembly (2) is also provided with an avoidance groove (201) capable of exposing the inner part of the free end of the hook section (12) when the clamping die assembly (2) clamps the J-shaped tube (1). The punching die assembly comprises a thimble (3), a punching needle (4) and a punching drive device. When the thimble (3) is driven by the punching drive device, it is inserted into the interior of the hook section (12) from the port of the hook section (12). The thimble (3) is provided with a hole that is connected to the hole. The punching needle (4) cooperates with the die hole (31), and the punching needle (4) can be extended into the avoidance groove (201) when driven by the punching drive device. After the punching needle (4) is extended into the avoidance groove (201), it is driven by the punching drive device to move toward the J-shaped tube (1) to cooperate with the ejector pin (3) to punch a hole in the hook section (12) of the J-shaped tube (1). The clamping die assembly (2) includes a first clamping module (21), a second clamping module (22) located on the right side of the first clamping module (21), and a clamping die driver capable of driving the relative movement of the two. A guide structure is provided between the first clamping module (21) and the second clamping module (22); The tube-clamping shaping structure comprises a J-shaped first clamping groove (211) provided on the right side wall of the first clamping module (21), and a J-shaped second clamping groove (221) provided on the left side wall of the second clamping module (22); when the first clamping module (21) and the second clamping module (22) are closed, a J-shaped hole (202) for clamping and accommodating the J-shaped tube (1) is formed between the first clamping groove (211) and the second clamping groove (221); The opening of the avoidance groove (201) faces downward, and the J-shaped hole (202) includes a straight hole section for clamping and receiving the straight tube section (11) of the J-shaped tube (1) and a curved hole section for clamping and receiving the hook section (12) of the J-shaped tube (1), and an inner curved portion of the curved hole section away from the straight hole section is in communication with the avoidance groove (201); Both ends of the J-shaped hole (202) are open downwards, and a guide hole (212) capable of guiding left and right is provided on the first clamping module (21), and the guide hole (212) is located in the area surrounded by the first clamping groove (211). A receiving member (23) is movably provided in the guide hole (212), and the top profile of the receiving member (23) is parallel to the hook portion of the first clamping groove (211), and the front side profile of the receiving member (23) is parallel to the straight portion of the first clamping groove (211). When the first clamping module (21) and the second clamping module (22) are opened, a vertical gap (204) is formed between the first clamping module (21) and the second clamping module (22) into which the J-shaped tube (1) can enter, and the receiving member (23) is connected to a receiving driver (24) capable of driving it to move into the vertical gap (204) to receive the J-shaped tube (1); The guide structure comprises a guide hole (222) provided on the second clamping module (22) along the left-right direction, and a guide rod (213) provided on the first clamping module (21) and slidingly engaged with the guide hole (222).

2. A J-tube punching mechanism according to claim 1, characterized in that: The punching drive device includes a fixed seat (51), a lifting seat (52), a lifting drive (53) arranged on the fixed seat (51) and capable of driving the lifting seat (52) to move up and down, a punching bracket (54) capable of moving forward and backward on the lifting seat (52), and a punching drive (55) arranged on the lifting seat (52) and capable of driving the punching bracket (54) to move forward and backward. The punching needle (4) is arranged at the upper end of the punching bracket (54) and the head of the punching needle (4) faces backward. When the lifting seat (52) moves upward, the punching needle (4) extends upward into the avoidance groove (201). When the punching drive (55) drives the punching needle (4) to move backward in the avoidance groove (201), the punching needle (4) punches a hole in the hook section (12) of the J-shaped tube (1).

3. A J-tube punching mechanism according to claim 2, characterized in that: Both ends of the J-shaped hole (202) are open downwards, and the ejector pin (3) is arranged on the lifting seat (52). When the lifting seat (52) moves upwards, the ejector pin (3) is inserted upwards into the interior of the hook section (12) of the J-shaped tube (1).

4. A J-tube punching mechanism according to claim 1, characterized in that: The first clamping module (21) is provided with an air guide hole (203) in communication with the first clamping groove (211).

5. A J-tube punching mechanism according to claim 1 or 4, characterized in that: The second clamping module (22) is provided with an air guide hole (203) in communication with the second clamping groove (221).

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