Ultrasonic continuous welding device capable of moving along any curve

Abstract

The utility model discloses an ultrasonic continuous welding device capable of moving along any curvilinear motion, which comprises a working platform used for placing and fixing a workpiece; a power mechanism; the welding mechanism is connected with the power mechanism and used for melting the workpiece to achieve welding connection, the welding mechanism comprises a workpiece contact mechanism, an ultrasonic welding machine and a workpiece pressing mechanism, the welding mechanism makes contact with the workpiece all the time through the workpiece contact mechanism, ultrasonic continuous welding is achieved through the ultrasonic welding machine, and the workpiece is pressed through the workpiece pressing mechanism; and the workpiece is prevented from tilting due to high-temperature melting deformation. The utility model solves the welding quality problem caused by the uneven surface of a workpiece during the existing ultrasonic continuous welding, solves the limitation that the existing ultrasonic welding device can only weld straight lines in a welding surface or a curved surface, can enable the ultrasonic continuous welding to enter any curve in a space, and has the advantages of simple and compact equipment structure and low cost. The device can be driven by any power mechanism such as a mechanical arm, a truss and a virtual shaft, and is suitable for industrial popularization and application.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic welding, and in particular relates to an ultrasonic continuous welding device capable of moving along an arbitrary curve. Background Art

[0002] There are various connection methods used for composite components, including riveting, gluing, bolting and welding. The welding connection methods mainly consist of resistance welding, induction welding and ultrasonic welding. Existing ultrasonic welding is mainly spot welding, that is, the ultrasonic welding head welds after contacting the workpiece and then immediately loses contact with the workpiece. Its welding range is small and can only perform small-scale connections, and long-distance welding between workpieces cannot be achieved.

[0003] During ultrasonic continuous welding, the welding head and the workpiece must be in close contact. During the welding process, the workpiece in contact with the welding head melts and deforms, causing the workpiece to tilt at the front end of the welding head's movement, affecting weldability. The tilted workpiece needs to be pressed down at the front of the welding head so that the workpiece in front of the welding head is always in contact with the workpiece being welded during the welding head's movement. At the same time, where the welding head passes, since the workpiece is in a molten state, it is still necessary to apply pressure to keep the workpieces in full contact for a short period of time. However, in existing ultrasonic continuous welding equipment, since the welding head, pressure-maintaining head, and pre-pressure head are arranged in a straight line in the welding equipment, during the continuous welding process, the welding head can only move along the straight line formed by the pre-pressure head, welding head, and pressure-maintaining head, or the projection of the straight line under the curved surface. It cannot make S-shaped movements on flat or curved surfaces, which leads to the limitations of existing ultrasonic continuous welding. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the purpose of the present utility model is to provide an ultrasonic continuous welding device that can move along an arbitrary curve.

[0005] In order to achieve the above purpose and the above technical effects, the technical solution adopted by the present invention is:

[0006] An ultrasonic continuous welding device capable of moving along an arbitrary curve comprises a power mechanism and a welding mechanism, wherein the power mechanism is connected to the welding mechanism, and the welding mechanism is driven to move by the power mechanism, and the workpiece is melted and welded to be connected by the welding mechanism. The welding mechanism comprises an ultrasonic welding machine, a workpiece contact mechanism and a workpiece clamping mechanism, and the workpiece contact mechanism and the workpiece clamping mechanism are respectively installed on the ultrasonic welding machine, and the workpiece contact mechanism and the workpiece clamping mechanism are respectively connected to a driving motor, and the workpiece contact mechanism and the workpiece clamping mechanism are respectively driven to rotate around the axis of the ultrasonic welding machine by the driving motor, and the workpiece contact mechanism is used to achieve constant contact with the workpiece, and ultrasonic continuous welding is achieved by the ultrasonic welding machine, and the workpiece is clamped by the workpiece clamping mechanism to prevent the workpiece from warping due to high-temperature melting deformation.

[0007] Furthermore, the workpiece contact mechanism and the workpiece pressing mechanism are respectively installed on two opposite sides of the ultrasonic welding machine.

[0008] Furthermore, the workpiece contact mechanism includes a first main gear, a first sub-gear, a pressure-maintaining turntable, a first guide cylinder, a driving cylinder and a pressure-maintaining head. The first main gear is connected to the driving motor, and the first main gear and the first sub-gear are meshed with each other. The pressure-maintaining turntable is arranged below the first sub-gear and is connected to the first sub-gear. The first guide cylinder is arranged below the pressure-maintaining turntable and is connected to the pressure-maintaining turntable. The first guide cylinder and the driving cylinder are respectively connected to the pressure-maintaining head. The first main gear is driven to rotate by the driving motor, driving the first sub-gear and the pressure-maintaining turntable to rotate, thereby driving the first guide cylinder, the driving cylinder and the pressure-maintaining head to rotate around the axis of the ultrasonic welding machine. The relative distance between the pressure-maintaining head and the welding head at the end of the ultrasonic welding machine is adjustable.

[0009] Furthermore, the pressure maintaining head includes a chamber and a pressure rod, the chamber is provided with a groove, a plurality of threaded holes, an air inlet and a common pressure chamber, a plurality of cylindrical chambers are opened at the lower part of the chamber, a plurality of pressure rods are provided at the lower part of the cylindrical chamber, the pressure rod can vertically reciprocate in the cylindrical chamber, the groove is used to be connected with the first guide cylinder and the driving cylinder, and the distance between the pressure maintaining head and the welding head is fixed by tightening the bolts in the threaded holes, the gas enters the common pressure chamber from the air inlet, so that the air pressure is evenly distributed in the common pressure chamber, the area of ​​all cylindrical chambers is the same, and the pressure on the pressure rod is the same. When the pressure rod contacts the workpiece, it can retract and imitate the surface of the workpiece so that the pressure rod can contact the workpiece as much as possible.

[0010] Furthermore, the ultrasonic welding machine includes a pushing cylinder, a welding machine hardware body and a welding head. The welding machine hardware body can move back and forth vertically under the action of the pushing cylinder. The welding head is arranged below the welding machine hardware body and can directly contact the workpiece and melt the workpiece.

[0011] Furthermore, the workpiece clamping mechanism includes a second main gear, a second sub-gear, a second guide cylinder and a pre-pressing head. The pre-pressing head presses the workpiece in front of the welding head at the end of the ultrasonic welding machine to prevent the workpiece from warping due to high-temperature melting deformation. The second main gear is connected to the driving motor, the second main gear is meshed with the second sub-gear, the second guide cylinder is fixed on the second sub-gear, and the second guide cylinder is connected to the pre-pressing head. The second main gear is driven to rotate by the driving motor, driving the second sub-gear, the second guide cylinder and the pre-pressing head to rotate around the axis of the ultrasonic welding machine. The relative distance between the pre-pressing head and the welding head at the end of the ultrasonic welding machine is adjustable.

[0012] Furthermore, the pre-pressing head includes a body and a pressing ball, and the pressing ball can rotate arbitrarily in the body.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model discloses an ultrasonic continuous welding device capable of moving along an arbitrary curve, which solves the welding quality problem caused by the uneven surface of the workpiece during the existing ultrasonic continuous welding, and solves the limitation of the existing ultrasonic welding device that it can only weld straight lines within a surface or a curved surface. The ultrasonic continuous welding can be carried out in the field of arbitrary curves in space. The overall device has a simple and compact structure and can be driven by any power mechanism such as a mechanical arm, a truss, a virtual axis or the like, and is suitable for industrial promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0016] Figure 2 This is a structural diagram of the welding mechanism of the present utility model;

[0017] Figure 3-4 They are respectively structural schematic diagrams of the workpiece contact mechanism of the present utility model;

[0018] Figure 5 This is a schematic structural diagram of the ultrasonic welding machine of the present invention;

[0019] Figure 6-7 They are respectively structural schematic diagrams of the workpiece pressing mechanism of the present utility model;

[0020] Figure 8 This is a schematic diagram of the positions of the workpiece contact mechanism, ultrasonic welding machine, and workpiece pressing mechanism of the present invention;

[0021] Figure 9 This is a schematic structural diagram of the pressure-maintaining head of the present utility model;

[0022] Figure 10 This is a layout diagram of the internal chamber of the pressure-maintaining head of the present invention;

[0023] Figure 11-12 They are respectively structural schematic diagrams of the pre-pressing head of the utility model;

[0024] Figure 13 This is a schematic structural diagram of step one of the present invention;

[0025] Figure 14 This is a schematic structural diagram of step 2 of the present invention;

[0026] Figure 15 This is a structural diagram of step three of the present utility model;

[0027] Figure 16This is a schematic structural diagram of step 4 of the present invention;

[0028] Figure 17 This is a structural diagram of step five of the present utility model;

[0029] Figure 18 This is a structural diagram of step six of the present invention. DETAILED DESCRIPTION

[0030] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0031] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0032] like Figure 1-18 As shown, an ultrasonic continuous welding device capable of moving along an arbitrary curve comprises:

[0033] A power mechanism, preferably a robotic arm 1, a truss power mechanism, a connecting rod power mechanism, a virtual axis, etc., mainly provides a motion source for the welding mechanism 2;

[0034] The welding mechanism 2 is the part of the equipment that comes into direct contact with the workpiece. Its main function is to convert electrical energy into mechanical energy and generate heat through high-frequency vibration to melt the workpiece and achieve a welded connection. The welding mechanism 2 mainly includes a mounting frame 4, a drive motor 5, a workpiece contact mechanism 6, an ultrasonic welding machine 7, and a workpiece clamping mechanism 8. The workpiece contact mechanism 6 ensures constant contact with the workpiece 26, and the ultrasonic welding machine 7 performs ultrasonic continuous welding. The workpiece clamping mechanism 8 clamps the workpiece 26 to prevent the workpiece 26 from warping due to high-temperature melting deformation, thereby improving the quality of the workpiece after welding.

[0035] The main function of the working platform 3 is to provide a carrier and support for the placement and fixation of the workpiece 26.

[0036] In the present utility model, the workpiece contact mechanism 6 and the workpiece clamping mechanism 8 are installed on the ultrasonic welding machine 7 through a gear structure. The workpiece contact mechanism 6 and the workpiece clamping mechanism 8 are respectively connected to a drive motor 5, that is, there are two drive motors 5. The two drive motors 5 respectively drive the workpiece contact mechanism 6 and the workpiece clamping mechanism 8 to rotate around the axis of the ultrasonic welding machine 7.

[0037] The workpiece contact mechanism 6 mainly includes a first main gear 9, a first sub-gear 10, a pressure-maintaining turntable 11, a first guide cylinder 12, a driving cylinder 13, a pressure-maintaining head 14, etc. The first main gear 9 is meshed with the first sub-gear 10, and one of the driving motors 5 is connected to the first main gear 9 for providing rotational power. The pressure-maintaining turntable 11 is arranged below the first sub-gear 10 and is connected to the first sub-gear 10. The first guide cylinder 12 is arranged below the pressure-maintaining turntable 11 and is connected to the pressure-maintaining turntable 11. The first guide cylinder 12 and the driving cylinder 13 are respectively connected to the pressure-maintaining head 14. The first main gear 9 is driven to rotate by the driving motor 5, driving the first sub-gear 10 and the pressure-maintaining turntable 11 to rotate, thereby driving the first guide cylinder 12, the driving cylinder 13 and the pressure-maintaining head 14 to rotate around the axis of the ultrasonic welding machine 7. The relative distance between the pressure-maintaining head 14 and the end of the ultrasonic welding machine 7 can be adjusted by the slide groove at the end of the cylinder.

[0038] The ultrasonic welding machine 7 includes a pushing cylinder 15, a welding machine hardware body 16 and a welding head 17. The welding machine hardware body 16 is a component that converts ultrasonic electrical energy into mechanical energy. The welding head 17 is a component that is in direct contact with the workpiece. The heat generated by the mechanical energy of high-frequency vibration is used to melt the workpiece 26 to achieve welding. The welding machine hardware body 16 can reciprocate up and down or vertically along the direction of the welding machine axis under the action of the pushing cylinder 15.

[0039] The pressure-maintaining head 14 includes a chamber 18 and a pressure rod 19. The chamber 18 has a slot 20, several threaded holes 21, an air inlet 22, and a common-pressure chamber 23. The slot 20 is used to connect to the first guide cylinder 12 and the drive cylinder 13. The slot 20 can be clamped at the end of the cylinder (first guide cylinder 12, drive cylinder 13), allowing the distance between the pressure-maintaining head 14 and the welding head 17 to be freely adjusted at the end. The distance between the pressure-maintaining head 14 and the welding head 17 is fixed by tightening the bolts in the threaded holes 21. Gas enters the common-pressure chamber 23 through the air inlet 22. A plurality of cylindrical chambers 24 are formed at the bottom of the chamber 18. Several pressure rods 25 are located below the cylindrical chambers 24. The pressure rods 25 can reciprocate vertically or vertically within the cylindrical chambers 24. The gas enters the common pressure chamber 23 from the air inlet 22, so that the air pressure is evenly distributed in the common pressure chamber 23. Since the areas of the cylindrical chambers 24 are the same, the pressure on the pressure rod 25 is the same. When the pressure rod 25 contacts the workpiece, due to the uneven surface of the workpiece, the traditional flat pressure block cannot completely contact the workpiece, resulting in different consolidation pressures of the workpiece, thereby causing defects. The pressure maintaining head 14 in the utility model is composed of multiple pressure rods 25. When encountering a workpiece with an uneven surface, it can retract and contour the workpiece surface so that the pressure rod 25 can contact the workpiece as much as possible, thereby improving the welding forming quality.

[0040] The workpiece clamping mechanism 8 includes a second main gear 26, a second sub-gear 27, a second guide cylinder 28 and a pre-pressing head 29. The pre-pressing head 29 presses the workpiece 26 in front of the welding head 17 at the end of the ultrasonic welding machine 7 to prevent the workpiece 26 from warping due to high-temperature melting deformation. Another drive motor 5 is connected to the second main gear 26 to provide rotational power. The second main gear 26 is meshed with the second sub-gear 27. The second guide cylinder 28 is fixed on the second sub-gear 27. The second guide cylinder 28 is connected to the pre-pressing head 29. The second main gear 26 is driven to rotate by the drive motor 5, driving the second sub-gear 27, the second guide cylinder 28, and the pre-pressing head 29 to rotate around the axis of the ultrasonic welding machine 7. The relative distance between the pre-pressing head 29 and the end of the ultrasonic welding machine 7 can be adjusted by the slide groove at the end of the cylinder.

[0041] The pre-pressing head 29 includes a body 30 and a pressing ball 31 . The pressing ball 31 can rotate freely in the body 30 .

[0042] A method for using an ultrasonic continuous welding device capable of moving along an arbitrary curve comprises the following steps:

[0043] Step 1: Place the workpiece 26 to be welded on the work platform 3. The surface of the workpiece 26 is the surface to be welded. The workpiece 26 is composed of two parts forming a "7" shape.

[0044] The welding mechanism 2 is driven by the power mechanism to a specified distance above the workpiece 26. The drive motor 5 connected to the workpiece contact mechanism 6, the push cylinder 15 of the ultrasonic welding machine 7, and the drive motor 5 connected to the workpiece clamping mechanism 8 are started, respectively driving the workpiece contact mechanism 6, the ultrasonic welding machine 7, and the workpiece clamping mechanism 8 to move downward to contact the workpiece 26. The ultrasonic welding head 17 of the ultrasonic welding machine 7 starts ultrasonic welding, and the chamber 18 is inflated to make the pressure holding head 14 contact the workpiece.

[0045] Step 2: The welding mechanism 2 moves forward to perform ultrasonic continuous welding. When encountering a curved workpiece, the drive motor of the workpiece clamping mechanism 8 works to rotate the pre-pressing head 29 around the axis of the welding head 17. The direction of rotation is the direction of change of the welding surface of the workpiece. While the pre-pressing head 29 rotates around the welding head 17, the entire welding mechanism 2 needs to move along the workpiece direction to ensure that the distance between the pre-pressing head 29 and the welding head 17 remains unchanged.

[0046] Step 3: The welding mechanism 2 passes through the corner of the workpiece and performs ultrasonic continuous welding;

[0047] Step 4: The workpiece contact mechanism passes through the bend. At this time, the driving motor of the workpiece contact mechanism 6 drives the pressure maintaining head 14 to rotate around the welding head 17, so that the pressure maintaining head 14 is always in contact with the workpiece 26. During this process, the pre-pressing head 29 needs to rotate relative to the welding head 17. Therefore, the pre-pressing head 29 and the pressure maintaining head 14 are linked to ensure that they are always on the workpiece 26 during the welding process.

[0048] Step 5: The welding mechanism 2 passes through the corner of the workpiece and performs ultrasonic continuous welding;

[0049] Step 6: After welding is completed, the welding mechanism 2 is driven away from the workpiece 26 and the work platform 3 by the power mechanism.

[0050] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0051] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An ultrasonic continuous welding device capable of moving along an arbitrary curve, characterized in that: It includes a power mechanism and a welding mechanism, which is connected to the welding mechanism. The power mechanism drives the welding mechanism to move, and the welding mechanism is used to melt the workpiece and realize welding connection. The welding mechanism includes an ultrasonic welding machine, a workpiece contact mechanism and a workpiece clamping mechanism. The workpiece contact mechanism and the workpiece clamping mechanism are respectively installed on the ultrasonic welding machine. The workpiece contact mechanism and the workpiece clamping mechanism are respectively connected to the driving motor, and the driving motor drives the workpiece contact mechanism and the workpiece clamping mechanism to rotate around the axis of the ultrasonic welding machine. The workpiece contact mechanism is used to achieve constant contact with the workpiece, and ultrasonic continuous welding is realized by the ultrasonic welding machine. The workpiece is clamped by the workpiece clamping mechanism to prevent the workpiece from warping due to high-temperature melting deformation.

2. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 1, characterized in that: The workpiece contact mechanism and the workpiece pressing mechanism are respectively installed on two opposite sides of the ultrasonic welding machine.

3. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 1, characterized in that: The workpiece contact mechanism includes a first main gear, a first sub-gear, a pressure-maintaining turntable, a first guide cylinder, a driving cylinder and a pressure-maintaining head. The first main gear is connected to the driving motor, and the first main gear and the first sub-gear are meshed with each other. The pressure-maintaining turntable is arranged below the first sub-gear and is connected to the first sub-gear. The first guide cylinder is arranged below the pressure-maintaining turntable and is connected to the pressure-maintaining turntable. The first guide cylinder and the driving cylinder are respectively connected to the pressure-maintaining head. The first main gear is driven to rotate by the driving motor, driving the first sub-gear and the pressure-maintaining turntable to rotate, thereby driving the first guide cylinder, the driving cylinder and the pressure-maintaining head to rotate around the axis of the ultrasonic welding machine. The relative distance between the pressure-maintaining head and the welding head at the end of the ultrasonic welding machine is adjustable.

4. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 3, characterized in that: The pressure maintaining head includes a chamber and a pressure rod. The chamber is provided with a groove, several threaded holes, an air inlet and a common pressure chamber. Several cylindrical chambers are opened at the lower part of the chamber. Several pressure rods are provided at the lower part of the cylindrical chamber. The pressure rod can reciprocate vertically in the cylindrical chamber. The groove is used to be connected with the first guide cylinder and the driving cylinder. The distance between the pressure maintaining head and the welding head is fixed by tightening the bolts in the threaded holes. The gas enters the common pressure chamber from the air inlet, so that the air pressure is evenly distributed in the common pressure chamber. The area of ​​all cylindrical chambers is the same, and the pressure on the pressure rod is the same. When the pressure rod contacts the workpiece, it can retract and imitate the surface of the workpiece so that the pressure rod can contact the workpiece as much as possible.

5. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 1, characterized in that: The ultrasonic welding machine includes a pushing cylinder, a welding machine hardware body and a welding head. The welding machine hardware body can vertically reciprocate under the action of the pushing cylinder. The welding head is arranged below the welding machine hardware body and can directly contact and melt the workpiece.

6. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 1, characterized in that: The workpiece clamping mechanism includes a second main gear, a second sub-gear, a second guide cylinder and a pre-pressing head. The pre-pressing head presses the workpiece in front of the welding head at the end of the ultrasonic welding machine to prevent the workpiece from warping due to high-temperature melting deformation. The second main gear is connected to the driving motor, the second main gear is meshed with the second sub-gear, the second guide cylinder is fixed on the second sub-gear, and the second guide cylinder is connected to the pre-pressing head. The second main gear is driven to rotate by the driving motor, driving the second sub-gear, the second guide cylinder and the pre-pressing head to rotate around the axis of the ultrasonic welding machine. The relative distance between the pre-pressing head and the welding head at the end of the ultrasonic welding machine is adjustable.

7. The ultrasonic continuous welding device capable of moving along an arbitrary curve according to claim 6, characterized in that: The pre-pressing head comprises a body and a pressing ball, and the pressing ball can rotate arbitrarily in the body.

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