Ultrasonic metal welding machine

Abstract

The utility model discloses an ultrasonic metal welding machine which comprises a machine frame. The lower mold frame is arranged at the bottom of the rack; the wire harness fixing unit is arranged at the front end of the lower mold frame; the terminal fixing unit comprises pressing arms located on the two sides of the lower die frame, the two pressing arms press down a terminal located on the lower die frame through two variable-pitch pressing mechanisms and then clamp the terminal, and a width-adjustable welding area is reserved at the upper end of the terminal. According to the ultrasonic welding device, the two pressing arms are driven by the two variable-pitch pressing mechanisms to be close to each other to stably press a terminal, welding is stable and reliable, the welding area with the adjustable width is reserved, and the ultrasonic welding device can adapt to ultrasonic welding parts of different specifications; and amplitude-change poles which are symmetrically arranged and are perpendicular to the welding unit are arranged at the two ends of the welding unit in the ultrasonic welding part correspondingly, the two amplitude-change poles can ensure that the downward pressing welding force of the welding unit is in the middle position, and the welding position is accurate.

Description

Technical Field

[0001] The utility model relates to a metal welding machine, in particular to an ultrasonic metal welding machine. Background Art

[0002] An ultrasonic metal welding machine utilizes high-frequency vibration waves to transfer to the surfaces of two metals to be welded. Under the condition of applying pressure, the two metal surfaces rub against each other to form a fusion between molecular layers. Its advantages lie in being fast, energy-saving, having high fusion strength, good electrical conductivity, no sparking, and being close to cold-state processing.

[0003] When the existing ultrasonic metal welding machines are actually working, most of them directly use air cylinders to drive two pressing blocks to press both ends of the terminals. In this way, it is impossible to adaptively adjust the welding area between the two terminals, and the welding quality of the ultrasonic waves is unstable. Secondly, during ultrasonic welding, since the welding head performs frictional welding back and forth, this will cause the position of the welding head to be not centered during welding, resulting in a deviation in the welding position, and further reducing the welding precision, unable to meet the actual use requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an ultrasonic metal welding machine to overcome the deficiencies of the prior art, with high welding stability and precision, and convenient and reliable operation.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: an ultrasonic metal welding machine, comprising:

[0006] A frame;

[0007] A lower mold frame, arranged at the bottom of the frame, for placing terminals;

[0008] A wire harness fixing unit, arranged at the front end of the lower mold frame, for fixing the wire harness arranged on the terminal;

[0009] A terminal fixing unit, arranged on both sides of the lower mold frame. Among them, the terminal fixing unit includes pressing arms located on both sides of the lower mold frame. The two pressing arms press and clamp the terminal located on the lower mold frame through two variable-distance pressing mechanisms, and a welding area with adjustable width is left at the upper end of the terminal;

[0010] An ultrasonic welding part, arranged on the frame so as to be capable of moving up and down, and located above the welding area, for performing ultrasonic welding on the terminal through the welding area.

[0011] Furthermore, a receiving block for placing the terminal is clamped on the upper surface of the lower mold frame, and the upper surface of the receiving block is serrated.

[0012] Further, the wire harness fixing unit includes a wire harness fixing bracket; two slidable transplanting blocks are provided on the wire harness fixing bracket, and two clamping jaws arranged oppositely are provided on the two transplanting blocks. Among them, when the two transplanting blocks drive the two clamping jaws to approach, a wire passing opening for the wire harness to pass through is left.

[0013] Further, a mating catch and a clamping groove are respectively provided on the opposite sides of the two clamping jaws.

[0014] Further, the ultrasonic welding part includes a lifting frame that can be lifted up and down by an electric cylinder; an ultrasonic generator is provided on the lifting frame; a welding unit is provided on the ultrasonic generator; and two symmetrically arranged horn bars are provided at both ends of the welding unit.

[0015] Further, the lifting frame is detachably connected to the ultrasonic generator through a die-changing mechanism.

[0016] Further, a wire blocking mechanism is further provided on the side of the lower die holder opposite to the wire harness fixing unit; the wire blocking mechanism includes a rotary cylinder; and a wire blocking plate for blocking the front end of the wire harness is provided on the rotary cylinder.

[0017] Further, the variable pitch pressing mechanism includes:

[0018] A carrier plate, which is arranged at the bottom of the frame and can be lifted up and down;

[0019] Pressing seats, two pressing seats are arranged on the carrier plate and are located on both sides of the lower die holder;

[0020] Fixed blocks, fixed blocks are provided on the opposite sides of the two pressing seats, and pressing arms are arranged at the front ends of the fixed blocks;

[0021] Sliding blocks, the sliding blocks are slidably arranged on one side of the pressing seats and are located below the fixed blocks;

[0022] A pushing assembly is arranged between the transplanting block and the fixed block. The pushing assembly includes a pushing plate that can move back and forth above the transplanting block through a pushing mechanism, and an inclined groove is provided on the pushing plate;

[0023] Link rods, the upper ends of the link rods are connected to the fixed blocks, the lower ends are connected to the sliding blocks, and the middle parts of the link rods are arranged in the inclined grooves;

[0024] Among them, when the pushing mechanism drives the pushing plate to move forward, the link rods slide in the inclined grooves through the sliding blocks, so as to drive the pressing arms connected to the link rods to move laterally.

[0025] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0026] The ultrasonic metal welding machine of the present utility model has a compact overall structure. Two variable-spacing pressing mechanisms drive two pressing arms to press the terminals up and down, so that the terminals can be pressed relatively stably. The ultrasonic welding is stable and reliable, and there is a welding area with adjustable width, which can adapt to ultrasonic welding parts of different specifications and meet the actual use requirements.

[0027] In addition, horn bars are symmetrically arranged at both ends of the welding unit. The two horn bars are perpendicular to the welding unit, and at the same time, the two horn bars are parallel to each other. When the welding unit presses down for welding by rubbing the terminals and the wire harness back and forth, the two horn bars can ensure the welding force pressed down by the welding unit at the middle position, making the welding position accurate and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution of the present utility model will be further described below in conjunction with the drawings:

[0029] Figure 1 It is the front view of an embodiment of the present utility model;

[0030] Figure 2 It is the three-dimensional structure schematic diagram of an embodiment of the present utility model;

[0031] Figure 3 It is the partial schematic diagram of the ultrasonic welding part in an embodiment of the present utility model;

[0032] Figure 4 It is the front view of an embodiment of the present utility model with the frame and the ultrasonic welding part omitted;

[0033] Figure 5 It is Figure 4 The three-dimensional structure schematic diagram of;

[0034] Figure 6 It is Figure 5 The enlarged view of part A in;

[0035] Figure 7 It is Figure 5 The three-dimensional structure schematic diagram of another perspective of;

[0036] Figure 8 It is the structure schematic diagram of the variable-spacing pressing mechanism in an embodiment of the present utility model;

[0037] Figure 9 It is Figure 8 The partial schematic diagram of;

[0038] Wherein: frame 1, lower die holder 2, wire harness fixing unit 3, terminal fixing unit 4, ultrasonic welding part 5, wire blocking mechanism 6, pressing arm 8, receiving block 20, wire harness fixing frame 30, transplanting block 31, clamping jaw 32, wire passing port 33, clamping block 330, clamping groove 331, bearing plate 40, pressing seat 41, fixing block 42, sliding block 44, pushing mechanism 45, pushing plate 46, connecting rod 47, guiding column 48, lifting cylinder 49, electric cylinder 50, lifting frame 51, ultrasonic generator 52, welding unit 53, horn 54, die changing mechanism 55, rotating cylinder 60, wire blocking plate 61, inclined groove 460. Specific embodiments

[0039] In order to enable those skilled in the art of the present technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

[0040] The present utility model provides an ultrasonic metal welding machine to solve the problems in the prior art that a cylinder is directly used to drive two pressing blocks to press the two ends of a terminal, so that the welding area between the two terminals cannot be adaptively adjusted, and the welding quality of ultrasonic waves is unstable; secondly, since the welding head performs friction welding back and forth, the position of the welding head is not centered during welding, resulting in a low welding accuracy.

[0041] For the convenience of understanding, the specific process in the embodiments of this application will be described below. Please refer to Figures 1 to 2 An ultrasonic metal welding machine in the embodiments of this application includes a frame 1, a lower die holder 2, a wire harness fixing unit 3, a terminal fixing unit 4, and an ultrasonic welding part 5; the lower die holder 2 is arranged on the frame 1 for placing terminals; the wire harness fixing unit 3 is arranged at the front end of the lower die holder 2 for fixing the wire harness arranged on the terminals; the terminal fixing unit 4 is arranged on both sides of the lower die holder 2, and the terminal fixing unit 4 includes pressing arms 8 located on both sides of the lower die holder 2. The two pressing arms 8 press and clamp the terminals located on the lower die holder 2 through two variable-distance pressing mechanisms, and a welding area with adjustable width is left at the upper end of the terminals; the ultrasonic welding part 5 is arranged on the frame in a vertically movable manner and is located above the welding area for performing ultrasonic welding on the terminals through the welding area.

[0042] The ultrasonic metal welding machine of the present utility model has a compact overall structure. Two variable-distance pressing mechanisms drive two pressing arms to press the terminals up and down, so that the terminals can be pressed relatively stably. The ultrasonic welding is stable and reliable, and the width of the welding area can be adjusted to adapt to ultrasonic welding parts of different specifications, with wide versatility.

[0043] Based on Figures 5 to 9 , in this embodiment, the variable-distance pressing mechanism includes a carrier plate 40, a pressing seat 41, a fixed block 42, a pressing arm 8, a sliding block 44, a pushing mechanism 45, a pushing plate 46 and a connecting rod 47. The carrier plate 40 can be lifted up and down on the upper surface of the bottom of the frame 1 by at least one lifting cylinder 49 and is guided by guide posts 48 at the four corners of the bottom of the carrier plate 40. The rest of the components are arranged on the carrier plate 40. When the carrier plate 40 moves up, it can drive all the above components to move up synchronously.

[0044] The two pressing seats 41 are arranged at both ends of the carrier plate 40, and the two pressing seats 41 are just located on both sides of the lower die holder 2. The pressing seat 41 in this embodiment is L-shaped; fixed blocks 42 are provided on the opposite sides of the two pressing seats 41, and the pressing arms 8 are arranged at the front ends of the fixed blocks 42. The two pressing arms 8 are used to press the terminals under the drive of the carrier plate 40.

[0045] A slidable sliding block 44 is respectively arranged on one side of each pressing seat 41, and the sliding block 44 is located below the connected fixed block 42 and pressing arm 8; a pushing assembly is arranged between the sliding block 44 and the fixed block 42. The pushing assembly includes a pushing plate 46 that can move back and forth above the sliding block 44 through a pushing mechanism 45. An inclined slot 460 is provided on the pushing plate 46. The pushing mechanism 45 in this embodiment is a pushing electric cylinder; the upper end of the connecting rod 47 is connected to the fixed block 42, the lower end is connected to the sliding block 44, and the middle part of the connecting rod 47 is arranged in the inclined slot 460, and at the same time, the inclined slot 460 is inclined towards the lower die holder 2; when the connecting rod 4 moves along the inclined slot 460, since the connecting rod 47 is connected to both the pressing arm 8 and the sliding block 44 at the same time, the connecting rod 47 can drive the pressing arm 8 to move horizontally synchronously when moving horizontally. Correspondingly, the two pressing arms 8 can move closer to or away from both sides of the lower die holder 2 synchronously.

[0046] During specific operation, when the wire harness and the terminals are both arranged on the receiving block 20, the variable-distance pressing mechanism starts to work at this time. First, the lifting cylinder 49 drives all the components on the carrier plate 40 to move up through the guide posts 48, so that the two pressing arms 8 also move up above the terminals.

[0047] Next, two driving electric cylinders synchronously drive the pushing plate 44 to move forward, thereby driving the two connecting rods 47 to move synchronously in the corresponding inclined slots 460. Since the inclination direction of the inclined slot 460 points to the lower die holder 2, the two connecting rods 47 slide towards one side of the lower die holder 2 under the drive of the corresponding sliding blocks 44. The connecting rods 47 are connected to the pressing arms 8, thereby driving the two pressing arms 8 to approach each other. When the two pressing arms 8 approach to the set position, the two driving electric cylinders stop working. At this time, the distance between the two pressing arms 8 is the reserved welding area.

[0048] After the welding area is determined, the lifting cylinder 49 drives the bearing plate 40 to move downward, thereby driving the two pressing arms 8 to move downward, and then pressing the terminals through the pressing arms 8. In summary, the pressing of the terminals is realized, and at the same time, the welding area for welding the terminals is reserved, and the operation is convenient and reliable.

[0049] In the terminal fixing unit 4 of this embodiment, two pushing mechanisms 45 are adopted, that is, the driving electric cylinder drives the two corresponding pressing arms 8 to move horizontally by sliding the connecting rod 47 in the inclined slot to realize the reserved welding area for the terminals. Such a moving position is accurate and reliable, ensuring the stable and reliable quality of ultrasonic welding.

[0050] Based on Figure 6 , in this embodiment, a receiving block 20 for placing the terminals is clamped on the upper surface of the lower die holder 2, which facilitates the replacement of the receiving block 20. In addition, the upper surface of the receiving block 20 is serrated. In this way, when the terminals are placed on the receiving block 20 and are pressed by the terminal fixing unit 4, the friction between the terminals and the receiving block 20 is large, so that the stability of the terminals after being pressed is good.

[0051] Based on Figures 4 to 6 , in this embodiment, the wire harness fixing unit 3 includes a wire harness fixing frame 30. The wire harness fixing frame 30 is arranged at the front end of the lower die holder 2. Two transplanting blocks 31 that can slide relative to each other through sliding rails are arranged on the wire harness fixing frame 30. Two clamping jaws 32 arranged oppositely are arranged on the tops of the two transplanting blocks 31. When the two clamping jaws 32 are clamped, a wire passing port 33 for clamping the wire harness is formed.

[0052] During operation, the two clamping jaws 32 can move with the two corresponding transplanting blocks 31 and then approach or separate from each other. When the wire harness passes through the wire passing port 33, the two clamping jaws 32 approach each other under the drive of the corresponding transplanting blocks 31 and clamp the wire harness. The wire passing port 33 in this embodiment is square, and of course, it can also be other shapes. Based on this, different widths of wire harnesses can be adapted through the wire passing port 33, improving the adaptability.

[0053] In addition, based on Figure 6, on opposite sides of the two clamping jaws 32, two mating clamping blocks 330 and three corresponding clamping grooves 331 are respectively provided. In this way, when the two clamping jaws 32 approach each other, through the mating of the two clamping blocks 330 and the three clamping grooves 331, the two clamping jaws 32 can be accurately gathered together, thereby clamping the wire harness more stably.

[0054] Based on Figures 1 to 3 , in this embodiment, the ultrasonic welding part 5 includes a lifting frame 51 that can be driven by an electric cylinder 50 to move up and down through a guide rail above the frame 1. An ultrasonic generator 52 is provided on the lifting frame 51. The ultrasonic generator 52 is connected to the welding unit 53 to drive the welding unit 53 to perform ultrasonic welding. Symmetrically arranged horn bars 54 are respectively provided at both ends of the welding unit 53. The two horn bars 54 are vertically arranged with respect to the welding unit 53, and at the same time, the two horn bars 54 are parallel to each other. In this way, the welding unit 53 can be located at the exact center position between the two horn bars 54. The function of adopting the above structure is that during ultrasonic welding, the welding unit 53 rubs the terminals and the wire harness back and forth, thereby driving the welding. Then, after the welding unit 53 is pressed down, the terminals and the wire harness are welded. When the welding unit 53 is pressed down, the two horn bars 54 can ensure the welding force of the pressed-down welding unit 53 at the middle position, making the welding position accurate and effective, meeting the actual requirements.

[0055] Based on Figure 2 , in this embodiment, the lifting frame 51 is detachably connected to the ultrasonic generator 52 and the welding unit 53 through a die-changing mechanism 55, so that the ultrasonic generator 52 and the welding unit 53 can be conveniently replaced in time, thereby adapting to the needs of different specifications of products, and having good versatility.

[0056] Based on Figure 5 and Figure 6 , in this embodiment, a wire blocking mechanism 6 is further provided on the lower die holder 2 on the side opposite to the wire harness fixing unit 3. The wire blocking mechanism 6 includes a rotary cylinder 60, and a wire blocking plate 61 for blocking the front end of the wire harness is provided on the rotary cylinder. During operation, when the wire harness extends forward through the wire passing port 33, the rotary cylinder 60 drives the wire blocking plate 61 to rotate and block the front end of the wire harness. Since the wire harness has a specified length and needs to be just blocked in front of the welded wire harness, the rotatable wire blocking plate 61 can effectively restrict the length of the wire harness, meeting the actual use requirements.

[0057] The overall processing flow is as follows:

[0058] 1. First, place the terminals on the receiving block 20;

[0059] 2. The rotating cylinder 60 rotates the wire guide plate 61 to the rear end of the terminal. Then, the wire harness passes through the wire passing port 33 and is placed on the terminal. At the same time, the front end of the wire harness is blocked by the wire guide plate 61, thus defining the length of the wire harness. Then, the two clamping jaws 32 move closer to each other to fix the position of the wire harness.

[0060] 3. The two pushing mechanisms 45 drive the push plate 46 to move backward, thereby driving the connecting rod 47 to move horizontally in the inclined groove 460. The connecting rod 47 drives the two pressing arms 8 to move closer to each other through the sliding block 44. When the two pressing arms 8 move close to the set position, the pushing electric cylinder stops working. At this time, the distance between the two pressing arms is the reserved welding area. The lifting cylinder 49 drives the bearing plate 40 to move downward, and the two pressing arms 8 press down to clamp the terminal.

[0061] 4. The lifting frame 51 drives the welding unit 53 to move downward into the welding area. Then, the ultrasonic generator 52 drives the welding unit 53 to work. Under the action of the two amplitude transformers 54, the force of the welding unit 53 pressing down is ensured at the middle position of the welding unit 53, making the welding position of the terminal and the wire harness in the welding area accurate and effective. Finally, the welding work of the terminal and the wire harness can be completed.

[0062] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An ultrasonic metal welding machine, characterized in that, Comprising: Frame; Lower die holder, arranged at the bottom of the frame for placing terminals; Wire harness fixing unit, arranged at the front end of the lower die holder for fixing the wire harness arranged on the terminals; Terminal fixing unit, arranged on both sides of the lower die holder. Among them, the terminal fixing unit includes pressing arms located on both sides of the lower die holder. The two pressing arms press down and clamp the terminals located on the lower die holder through two variable pitch pressing mechanisms, and a welding area with adjustable width is left at the upper end of the terminals; Ultrasonic welding part, arranged on the frame and capable of moving up and down, and located above the welding area for ultrasonically welding the terminals through the welding area.

2. The ultrasonic metal welding machine according to claim 1, characterized in that: A receiving block for placing terminals is clamped on the upper surface of the lower die holder, and the upper surface of the receiving block is serrated.

3. The ultrasonic metal welding machine according to claim 1, characterized in that: The wire harness fixing unit includes a wire harness fixing frame; two slidable transplanting blocks are arranged on the wire harness fixing frame, and two clamping jaws arranged oppositely are arranged on the two transplanting blocks. Among them, when the two transplanting blocks drive the two clamping jaws to approach, a wire passing opening for the wire harness to pass through is left.

4. The ultrasonic metal welding machine according to claim 3, wherein: A mating block and a card slot are respectively arranged on the opposite sides of the two clamping jaws.

5. The ultrasonic metal welding machine according to claim 1, characterized in that: The ultrasonic welding part includes a lifting frame that can be driven by an electric cylinder to move up and down; an ultrasonic generator is arranged on the lifting frame; a welding unit is arranged on the ultrasonic generator; two horn-shaped rods arranged symmetrically are arranged at both ends of the welding unit.

6. The ultrasonic metal welding machine according to claim 5, characterized in that: The lifting frame is detachably connected to the ultrasonic generator through a die changing mechanism.

7. The ultrasonic metal welding machine according to claim 1, wherein: A wire blocking mechanism is further arranged on the side of the lower die holder opposite to the wire harness fixing unit; the wire blocking mechanism includes a rotary cylinder; a wire blocking plate for blocking the front end of the wire harness is arranged on the rotary cylinder.

8. The ultrasonic metal welding machine according to claim 1, characterized in that, The variable pitch pressing mechanism includes: A bearing plate, arranged at the bottom of the frame and capable of moving up and down; Pressing seats, two pressing seats are arranged on the bearing plate and located on both sides of the lower die holder; Fixed blocks, fixed blocks are arranged on the opposite sides of the two pressing seats, and the pressing arms are arranged at the front ends of the fixed blocks; Sliding blocks, the sliding blocks are slidably arranged on one side of the pressing seats and located below the fixed blocks; A pushing assembly, arranged between the transplanting blocks and the fixed blocks. The pushing assembly includes a pushing plate that can move back and forth above the transplanting blocks through a pushing mechanism, and an inclined groove is arranged on the pushing plate; A connecting rod, the upper end of the connecting rod is connected to the fixed block, the lower end is connected to the sliding block, and the middle part of the connecting rod is arranged in the inclined groove; Among them, when the pushing mechanism drives the pushing plate to move forward, the connecting rod slides in the inclined groove through the sliding block, thereby driving the pressing arm connected to the connecting rod to move laterally.

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