A pressure detection assembly for ultrasonic welding head and detection device thereof

Abstract

The present invention belongs to the technical field of ultrasonic welding, and specifically relates to a pressure detection assembly for an ultrasonic welding head and a detection device thereof, wherein the pressure detection assembly comprises: a guide unit, comprising a connecting plate, a T-shaped piece and a guide shaft, one end of the T-shaped piece passes through the connecting plate and is fixedly connected to the welding head, and the other end of the T-shaped piece protrudes above the connecting plate; one end of the guide shaft is fixedly connected to the connecting plate, and the other end of the guide shaft is telescopically matched with the welding head; an elastic unit, comprising a first spring and a second spring, the first spring is sleeved on one end of the T-shaped piece protruding from the connecting plate; the second spring is sleeved on the guide shaft; a detection piece is arranged on the connecting plate, and the pressure change when the welding head presses down the workpiece is detected by the detection piece; the present invention uses soft connections between parts to generate relative displacement and elastic force between the workpieces, thereby realizing low-pressure welding of the welded parts, and can avoid direct damage to the ceramic substrate due to excessive gravity of the welding head.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic welding, and in particular relates to a pressure detection component for an ultrasonic welding head and a detection device thereof. Background Art

[0002] The semiconductor industry is rapidly developing, and the application of ultrasonic welding in this industry is also expanding. Compared with traditional metal welding and non-woven fabric welding, the pressure required for ultrasonic welding is much lower than that of metal welding because the pressure resistance of ceramic substrates in the semiconductor industry is much lower than that of metal foil. To avoid damaging the ceramic substrates, the pressure required for ultrasonic welding is much lower than that of metal welding.

[0003] Because the weight of the welding head can exceed the tolerance of the substrate, contact with the workpiece surface can damage the workpiece. Currently, the weight of the welding head assembly can reach 150N or more, while the ceramic substrate can only withstand a few tens of Newtons. Therefore, when the welding head presses against the workpiece surface for welding, the weight of the welding head can directly damage the ceramic substrate.

[0004] In the existing welding head connection structure, the various parts are connected by fixing methods such as bolts. There is no relative displacement between the parts during operation, which makes it inconvenient to adjust the position. For example, the patent document with application number 202110216868.5 discloses a pressure detection assembly and ultrasonic welding equipment. The pressure detection assembly includes a first connecting member, a second connecting member, a detection unit and an elastic member, wherein the first connecting member is provided with a first guide portion; the second connecting member is connected to the first connecting member, and the second connecting member is provided with a second guide portion that cooperates with the first guide portion; the detection unit is provided between the first connecting member and the second connecting member, and the detection unit is used to collect the pressure value between the first connecting member and the second connecting member; the elastic member is connected between the first connecting member and the second connecting member, and the elastic member can clamp the first connecting member and the second connecting member to the detection unit. In this patent document, a hard connection method is adopted between the first connecting member, the second connecting member and the elastic member. The preload force of the elastic member is a fixed value, and the elastic member is compressed to be locked to overcome the gap between the welding head and the weldment. However, this structural design is only applicable to hard connection methods and cannot be applied to soft connection scenarios. Moreover, when relative displacement occurs between parts during operation, it is impossible to achieve accurate pressure detection, and there are certain defects in actual use.

[0005] Therefore, it is necessary to improve the detection device of the existing welding equipment to overcome the shortcomings in practical applications. Summary of the Invention

[0006] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a pressure detection component and a detection device for an ultrasonic welding head that meet one or more of the above-mentioned needs.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A pressure detection assembly for an ultrasonic welding head, comprising:

[0009] The guide unit includes a connecting plate, a T-shaped piece, and a guide shaft, wherein one end of the T-shaped piece passes through the connecting plate and is fixedly connected to the welding head, and the other end of the T-shaped piece protrudes above the connecting plate; one end of the guide shaft is fixedly connected to the connecting plate, and the other end of the guide shaft is telescopically fitted with the welding head;

[0010] The elastic unit includes a first spring and a second spring. The first spring is sleeved on one end of the T-shaped piece protruding from the connecting plate; the second spring is sleeved on the guide shaft;

[0011] The detection component is arranged on the connecting plate, and detects the pressure change when the welding head presses down the workpiece through the detection component.

[0012] As a preferred solution, one end of the first spring abuts against the connecting plate, and the other end of the first spring contacts and cooperates with the T-shaped piece. When the first spring is in a free state, under the action of its own gravity, one end of the first spring abuts against the connecting plate, and the other end is spaced a certain distance from the end of the T-shaped piece.

[0013] As a preferred solution, one end of the second spring abuts against the surface of the welding head, and the other end of the second spring contacts and cooperates with the connecting plate. When the second spring is in a free state, under the action of its own gravity, one end of the second spring abuts against the welding head, and the other end is spaced a certain distance from the lower bottom surface of the T-shaped piece.

[0014] As a preferred solution, the connecting plate includes a frustum and a column, one end of the column is fixed to the frustum, and the other end of the column is fixedly connected to the detection part, and the real-time pressure generated during the downward pressing of the welding head is detected by the detection part.

[0015] As a preferred solution, the guide shaft and the column are coaxially arranged to keep the guide shaft and the column moving in the same direction and avoid offset caused by inconsistent moving directions, which affects the detection accuracy.

[0016] As a preferred solution, the truncated cone is penetrated by a plurality of through holes, which are evenly distributed along the circumference of the truncated cone. The number of through holes can be two, four or more, and the number can be set according to actual needs.

[0017] As a preferred solution, the T-shaped piece includes a guiding portion and a blocking portion, a first spring is installed between the blocking portion and the truncated cone, and the first spring is sleeved on the guiding portion to ensure that the first spring is freely compressed.

[0018] As a preferred solution, the guide portions correspond to the through holes one by one and respectively pass through the through holes. The guiding accuracy can be improved through the guiding cooperation between the two.

[0019] As a preferred solution, the welding head is provided with a guide groove, and the guide groove and the guide shaft are telescopically matched to ensure that the second spring installed therebetween can be freely compressed.

[0020] The present invention also provides a pressure detection device for an ultrasonic welding head, comprising a machine base and a drive assembly, wherein the output shaft of the drive assembly is connected to the pressure detection assembly as described in any of the above schemes, the drive assembly is installed on the machine base, the machine base is provided with a guide rail, and the welding head is provided with a slider that slides with the guide rail to achieve a guiding effect on the welding head.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention generates relative displacement and elastic force between workpieces through soft connections between parts, thereby achieving low-pressure welding of welded parts and avoiding direct damage to the ceramic substrate due to excessive gravity of the welding head.

[0023] In the present invention, the component force of the welding head gravity acting on the workpiece and the component force acting on the welding head connector can be detected by a pressure sensor, and the force on the workpiece surface can be linearly detected from zero to achieve real-time dynamic detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structural connection of the pressure detection assembly of Example 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the pressure detection device according to the first embodiment of the present invention;

[0026] Figure 3 is a side view of the pressure detection device according to the first embodiment of the present invention;

[0027] In the figure: 10 pressure detection device, 11 machine base, 110 guide rail, 12 drive assembly, 13 welding head, 130 slider, 131 guide groove, 14 workpiece;

[0028] 100 guide unit, 101 connecting plate, 1010 frustum, 1011 column, 1012 through hole, 102 T-shaped piece, 1020 guide portion, 1021 blocking portion, 103 guide shaft;

[0029] 200 elastic unit, 201 first spring, 202 second spring;

[0030] 300 test pieces. DETAILED DESCRIPTION

[0031] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0032] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Example 1:

[0037] like Figure 1 As shown, a pressure detection assembly for an ultrasonic welding head in this embodiment includes a guide unit 100, an elastic unit 200 and a detection member 300. The guide unit 100 includes a connecting plate 101, a T-shaped member 102 and a guide shaft 103. One end of the T-shaped member 102 passes through the connecting plate 101 and is fixedly connected to the welding head 13, and the other end of the T-shaped member 102 protrudes from the connecting plate 101. One end of the guide shaft 103 is fixedly connected to the connecting plate 101, and the other end of the guide shaft 103 is telescopically fitted to the welding head 13. The elastic unit 200 includes a first spring 201 and a second spring 202. The first spring 201 is sleeved on one end of the T-shaped member 102 protruding from the connecting plate 101. The second spring 202 is sleeved on the guide shaft 103. The detection member 300 is arranged on the connecting plate 101. The detection member 300 uses a pressure sensor to detect the pressure change when the welding head 13 presses down the workpiece 14.

[0038] In this embodiment, the upper end of the pressure sensor is connected to the drive assembly 12, which can use a drive motor or a cylinder. The lower end of the pressure sensor is fixedly connected to the connecting plate 101, so that the gravity change when the welding head 13 presses down the workpiece 14 is obtained through the pressure sensor.

[0039] Specifically, the connecting plate 101 includes a truncated cone 1010 and a column 1011. The column 1011 is vertically arranged in an upward direction at the center of the truncated cone 1010, so that one end of the column 1011 is fixed to the truncated cone 1010, and the other end of the column 1011 is fixedly connected to the detection member 300. The truncated cone 1010 is provided with a plurality of through holes 1012, which are evenly distributed along the circumference of the truncated cone 1010 and arranged in the vertical direction.

[0040] Furthermore, the T-shaped member 102 includes a guide portion 1020 and a blocking portion 1021. The guide portion 1020 is fixedly connected to the blocking portion 1021 and is vertically arranged. A first spring 201 is installed between the blocking portion 1021 and the round table 1010, and the first spring 201 is sleeved on the guide portion 1020. The guide portion 1020 corresponds to the through hole 1012 one-to-one. The guide portion 1020 passes through the through hole 1012 and is fixedly connected to the welding head 13. The guide portion 1020 and the through hole 1012 are guided and cooperated, so that the guide portion 1020 moves in the vertical direction relative to the through hole 1012.

[0041] Furthermore, the inner diameter of the first spring 201 is larger than the aperture of the through hole 1012, and the outer diameter of the first spring 201 is smaller than the width of the blocking portion 1021. This ensures that the first spring 201 is sleeved outside the guide portion 1020 and installed between the blocking portion 1021 and the round table 1010, and can be normally extended and retracted. In this embodiment, the T-shaped member 102 can be made of a height screw, and the welding head is provided with a corresponding thread. The height screw passes through the through hole 1012 and is connected to the welding head 13 via the thread, ensuring a more secure connection between the T-shaped member 102 and the welding head 13.

[0042] In this embodiment, there are two through holes 1012 in the connecting plate 101, and the two through holes 1012 are symmetrically arranged relative to the column 1011 of the connecting plate 101. Correspondingly, two guide parts 1020 are also arranged on the T-shaped piece 102. Through the guiding cooperation of the two groups of guide parts 1020 and the through holes 1012, the guiding accuracy can be improved and the balance and stability of the structure can be ensured. It should be noted that the number of through holes 1012 in this embodiment can also be set to three, four or more. The specific number can be set according to actual needs and is not limited to two in this embodiment. Multiple through holes 1012 are evenly arranged on the frustum 1010 of the connecting plate 101, the size of the through holes 1012 remains consistent, and the positions of the through holes 1012 are arranged in an array relative to the columns 1011; correspondingly, the number of guide portions 1020 of the T-shaped piece 102 also changes accordingly, and the size of the T-shaped piece 102 remains consistent to ensure that when the T-shaped piece 102 is connected to the welding head 13, the welding head 13 is subjected to balanced force, thereby avoiding movement errors of the welding head 13 due to uneven force and improving the accuracy of pressure detection.

[0043] Furthermore, a guide shaft 103 is provided in the downward direction of the center position of the connecting plate 101. The guide shaft 103 is fixedly connected to the connecting plate 101 and is vertically arranged, so that the guide shaft 103 and the column 1011 are arranged coaxially, keeping the guide shaft and the column moving in the same direction, and avoiding offset caused by inconsistent movement directions, which affects the detection accuracy. The guide shaft 103 and the connecting plate 101 can be connected by a threaded connection, and the other end of the guide shaft 103 and the welding head 13 are telescopically matched. Specifically, the welding head 13 is provided with a guide groove 131, the inner diameter of the guide groove 131 is larger than the outer diameter of the guide shaft 103, and the depth of the guide groove 131 is less than the length of the guide shaft 103, so as to ensure that the guide shaft 103 and the guide groove 131 can be telescopically matched, thereby ensuring that the second spring 202 installed therebetween can be freely compressed.

[0044] Furthermore, the inner diameter of the second spring 202 is larger than the inner diameter of the guide groove 131. At the same time, the inner diameter of the second spring 202 is larger than the outer diameter of the guide shaft 103 to ensure that the second spring 202 is sleeved outside the guide shaft 103 and installed between the welding head 13 and the connecting plate 101, and can expand and contract normally and freely.

[0045] In this embodiment, one end of the first spring 201 abuts against the connecting plate 101, and the other end of the first spring 201 contacts and fits with the T-shaped piece 102. One end of the second spring 202 abuts against the surface of the welding head 13, and the other end of the second spring 202 contacts and fits with the connecting plate 101.

[0046] Specifically, when the welding head 13 is in its natural state, the connecting plate 101 is in a stationary state. Under the action of the gravity of the welding head 13, the welding head 13 connected to the T-shaped piece 102 moves downward and compresses the first spring 201, causing the first spring 201 to be in a compressed state. At this time, the two ends of the first spring 201 are respectively in contact with the truncated cone 1010 of the connecting plate 101 and the blocking portion 1021 of the T-shaped piece 102. Correspondingly, the second spring 202 is in its natural state at this time, with the lower end of the second spring 202 abutting the surface of the welding head 13, and a certain distance between the upper end of the second spring 202 and the connecting plate 101, which can ensure that the second spring 202 is not affected when it is free to expand and contract.

[0047] The workpiece 14 in this embodiment is fixed by a ceramic substrate, and can also be transferred to the bottom of the welding head 13 by a conveying device. When the welding head 13 presses down and begins to contact the surface of the workpiece 14, the workpiece 14 begins to be subjected to force, and the compression of the first spring 201 decreases. Since the first spring 201 has not yet recovered, the second spring 202 and the connecting plate 101 are still not in contact, and the second spring 202 is not compressed. When the welding head 13 continues to press down on the workpiece 14, the first spring 201 recovers, and the second spring 202 begins to contact the connecting plate 101 and is compressed. At this time, the lower end of the second spring 202 abuts the surface of the welding head 13, and the upper end of the second spring 202 abuts the connecting plate 101.

[0048] The working principle of the pressure detection component of the ultrasonic welding head in this embodiment is as follows:

[0049] When not working, the welding head 13 is in a natural state, with a certain distance between the welding head 13 and the surface of the workpiece 14, and the connecting plate 101 is also in a static state. Due to the influence of the welding head 13's own gravity, the welding head 13 will be connected to the T-shaped piece 102 and move downward through the through hole 1012 set in the connecting plate 101. The blocking portion 1021 of the T-shaped piece 102 will contact the first spring 201, causing the first spring 201 to be in a compressed state. At this time, the gravity of the welding head 13 is equal to the elastic force generated by the compression of the first spring 201. Correspondingly, the second spring 202 is in a free state and has not yet come into contact with the connecting plate 101. At this time, the distance between the welding head 13 and the workpiece 14 is the compression amount of the first spring 201.

[0050] When the work starts, the driving assembly 12 drives the welding head 13 to start pressing down. At this time, the welding head 13 slowly contacts the surface of the workpiece, and the weight of the welding head 13 begins to change:

[0051] (1) At the beginning, the first spring 201 is fully compressed, and the pressure generated by the compression of the first spring 201 is equal to the gravity of the welding head 13; the second spring 202 is not in contact with the connecting plate 101 and is in a free state.

[0052] (2) When the welding head 13 is slowly pressed down until it contacts the surface of the workpiece 14, the force state at this time changes to the workpiece 14 being subjected to part of the force and the first spring 201 being subjected to part of the force. At this time, the compression amount of the first spring 201 is reduced, and the pressure generated by the reduced compression amount is the pressure amount of the welding head 13 pressing on the surface of the workpiece 14. Since the first spring 201 has not yet recovered, the second spring 202 is still not in contact with the connecting plate 101, and the second spring 202 does not generate any compression force.

[0053] (3) The welding head 13 continues to press down the workpiece 14, causing the first spring 201 to recover. At this time, the force on the surface of the workpiece 14 is equal to the gravity of the welding head 13. At the same time, the second spring 202 begins to contact the connecting plate 101 and is slowly compressed. When the second spring 202 continues to be compressed, the force on the surface of the workpiece 14 is equal to the sum of the pressure generated by the gravity of the welding head 13 and the compression of the second spring 202.

[0054] During this working process, the real-time component force of the gravity of the welding head 13 acting on the workpiece 14 and the real-time component force acting on the welding head connector can be detected by the pressure sensor, and the force on the surface of the workpiece 14 can be linearly detected from zero, realizing real-time dynamic detection and corresponding electrical control at the same time.

[0055] The structural design of this embodiment generates relative displacement and elastic force between the workpieces through soft connections between parts, thereby achieving low-pressure welding of the welded parts and avoiding direct damage to the ceramic substrate due to excessive gravity of the welding head.

[0056] If you need to increase or decrease the pressure of the welding head on the workpiece, you can choose to replace the first spring and / or the second spring. Since the difference in elastic coefficients of different springs leads to different pressures, the pressure of the welding head pressing down on the workpiece can be controlled.

[0057] like Figures 2 to 3 As shown, this embodiment also provides a pressure detection device for an ultrasonic welding head, including a base 11 and a drive assembly 12. The output shaft of the drive assembly 12 is connected to the pressure detection assembly in this embodiment. The drive assembly 12 is installed on the base 11. The base 11 is provided with a guide rail 110, and the welding head 13 is provided with a slider 130 that slides with the guide rail 110.

[0058] Specifically, the output shaft of the drive assembly is connected to the pressure sensor to achieve power transmission to the pressure detection assembly. A guide rail arranged in the vertical direction is installed on the machine base, and the welding head is slidably connected to the guide rail on the machine base through a slider to achieve a guiding effect on the welding head.

[0059] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, based on the ideas provided by the present invention, there may be changes in the specific implementation methods, and these changes should also be considered as the scope of protection of the present invention.

Claims

1. A pressure detection assembly for an ultrasonic welding head, characterized in that: include: The guide unit includes a connecting plate, a T-shaped piece, and a guide shaft, wherein one end of the T-shaped piece passes through the connecting plate and is fixedly connected to the welding head, and the other end of the T-shaped piece protrudes above the connecting plate; one end of the guide shaft is fixedly connected to the connecting plate, and the other end of the guide shaft is telescopically fitted with the welding head; The elastic unit includes a first spring and a second spring. The first spring is sleeved on one end of the T-shaped piece protruding from the connecting plate. One end of the first spring abuts against the connecting plate, and the other end contacts and fits with the T-shaped piece. The second spring is sleeved on the guide shaft. The detection part is fixedly connected to the connecting plate through a column, and detects the pressure change when the welding head presses down the workpiece through the detection part. One end of the column is fixed to the connecting plate, and the other end is fixedly connected to the detection part.

2. A pressure detection assembly for an ultrasonic welding head according to claim 1, characterized in that: One end of the second spring abuts against the surface of the welding head, and the other end of the second spring contacts and fits with the connecting plate under pressure.

3. The pressure detection assembly for an ultrasonic welding head according to claim 1, characterized in that: The connecting plate includes a truncated cone and a column, one end of the column is fixed to the truncated cone, and the other end of the column is fixedly connected to the detection member.

4. The pressure detection assembly for an ultrasonic welding head according to claim 3, characterized in that: The guide shaft and the column are coaxially arranged.

5. The pressure detection assembly for an ultrasonic welding head according to claim 3, characterized in that: The truncated cone is penetrated by a plurality of through holes, and the plurality of through holes are evenly distributed along the circumference of the truncated cone.

6. The pressure detection assembly for an ultrasonic welding head according to claim 5, characterized in that: The T-shaped piece includes a guiding portion and a blocking portion. A first spring is installed between the blocking portion and the circular table. The first spring is sleeved on the guiding portion.

7. The pressure detection assembly for an ultrasonic welding head according to claim 6, characterized in that: The guide parts correspond to the through holes one by one and pass through the through holes respectively.

8. The pressure detection assembly for an ultrasonic welding head according to claim 1, characterized in that: The welding head is provided with a guide groove, and the guide groove is telescopically matched with the guide shaft.

9. A pressure detection device for an ultrasonic welding head, characterized in that: It includes a machine base and a drive assembly, the output shaft of the drive assembly is connected to the pressure detection assembly as described in any one of claims 1 to 8, the drive assembly is installed on the machine base, the machine base is provided with a guide rail, and the welding head is provided with a slider that slides with the guide rail.

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