Nosepiece assembly and ultrasonic welding machine capable of accurately detecting pressure

Abstract

The utility model provides a kind of machine head assembly and ultrasonic welding machine that can accurately detect pressure, and the machine head assembly includes vibration cylinder driving assembly, vibration cylinder assembly, pressure detection component and lifting support, vibration cylinder assembly is set on lifting support, pressure detection component is connected between vibration cylinder driving assembly and vibration cylinder assembly, vibration cylinder driving assembly drives vibration cylinder assembly to move up and down, and pressure detection component includes connecting piece, pressure sensor and pressure head, connecting piece is connected between the drive shaft of vibration cylinder driving assembly and pressure sensor, pressure head is set on vibration cylinder assembly and is set below pressure sensor, and point contact connection between pressure sensor and pressure head;The ultrasonic welding machine includes base, column assembly and machine head assembly, column assembly is set on base, and machine head assembly is set on column assembly;The utility model can overcome the problem that pressure detection result is inaccurate due to the inclination of vibration cylinder assembly, to improve detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic welding machine technology, specifically to a head assembly capable of accurately detecting pressure and an ultrasonic welding machine. Background Technology

[0002] Ultrasonic welding machines are widely used in plastic welding, metal welding, and other processing fields. They achieve welding by heating and melting materials through high-frequency vibration, followed by cooling and shaping under pressure. During operation, the ultrasonic welding machine's oscillator drive assembly moves the oscillator assembly downwards along a guide rail. A pressure detection assembly monitors the pressure between the oscillator drive assembly and the oscillator assembly, allowing for control of the pressure applied by the welding head. The oscillator assembly slides along the guide rail via a slider. An unavoidable gap exists between the slider and the guide rail, and the reaction force from the workpiece on the welding head causes the oscillator drive assembly to move the oscillator assembly downwards not necessarily vertically, but at a slight angle.

[0003] In existing technology, the pressure detection assembly includes a mounting housing, a pressure sensor, and a connector. The mounting housing is mounted on the oscillating cylinder assembly, the pressure sensor is mounted inside the mounting housing, and the two ends of the connector are connected to the pressure sensor and the drive shaft of the oscillating cylinder drive assembly, respectively. Because the contact surface between the bottom of the pressure sensor and the mounting housing is surface-to-surface, when the oscillating cylinder assembly tilts at a small angle, the contact area between the two becomes uneven, resulting in localized stress concentration, which affects the detection accuracy of the pressure sensor. Utility Model Content

[0004] The primary objective of this invention is to provide a head assembly capable of accurately detecting pressure.

[0005] The second objective of this invention is to provide an ultrasonic welding machine comprising the aforementioned head assembly.

[0006] To achieve the aforementioned first objective, this utility model provides a machine head assembly capable of accurately detecting pressure, comprising a vibrating cylinder drive assembly, a vibrating cylinder assembly, a pressure detection assembly, and a lifting bracket. The vibrating cylinder assembly is mounted on the lifting bracket, and the pressure detection assembly is connected between the vibrating cylinder drive assembly and the vibrating cylinder assembly. The vibrating cylinder drive assembly can drive the vibrating cylinder assembly to move up and down. The pressure detection assembly includes a connector, a pressure sensor, and a pressure head. The connector is connected between the drive shaft of the vibrating cylinder drive assembly and the pressure sensor. The pressure head is mounted on the vibrating cylinder assembly and positioned below the pressure sensor, with a point contact connection between the pressure sensor and the pressure head.

[0007] As can be seen from the above scheme, setting a point contact connection between the pressure sensor and the pressure head helps reduce the contact area between the two, avoiding pressure dispersion caused by surface contact. Even if the oscillating cylinder assembly tilts at a small angle during downward movement, the pressure head and pressure sensor can still be evenly stressed, which helps improve the accuracy and consistency of pressure detection results. Moreover, the point contact connection can also avoid local stress concentration caused by assembly errors or off-center loading, preventing damage to the pressure sensor due to uneven stress and extending its service life.

[0008] A further design is to provide an upwardly protruding first contact surface at the top of the pressure head, which is a three-dimensional symmetrical curved surface with its axis of symmetry vertically passing through the highest point of the curved surface; and to provide a second contact surface at the bottom of the pressure sensor, which can be either a plane or a curved surface.

[0009] As can be seen from the above scheme, the above settings ensure that the first contact surface and the second contact surface always maintain point contact.

[0010] A further design involves a third contact surface protruding downwards at the bottom of the pressure sensor. This third contact surface is a three-dimensionally symmetrical curved surface, with its axis of symmetry vertically passing through the lowest point of the curved surface. A fourth contact surface is provided at the top of the pressure head, which can be either a plane or a curved surface.

[0011] As can be seen from the above scheme, the above settings ensure that the third contact surface and the fourth contact surface always maintain point contact.

[0012] A further embodiment includes a mounting housing on top of the oscillating cylinder assembly. The mounting housing contains a receiving cavity, and its top wall has a mounting hole communicating with the receiving cavity. A pressure sensor is located within the receiving cavity, with the lower part of a connector extending into the mounting hole and fixedly connected to the pressure sensor. The top wall of the receiving cavity has a first stop that abuts against the connector or the pressure sensor. A pressure head is fixedly connected to the oscillating cylinder assembly, with its upper part extending into the receiving cavity and abutting against the pressure sensor.

[0013] As can be seen from the above scheme, with the above settings, the force applied by the connector to the pressure sensor always remains vertical, while the pressure head is affected by the current state of the oscillating cylinder assembly and may tilt relative to the pressure sensor. Even if tilting occurs, the contact between the two is always point contact.

[0014] A further embodiment is that the mounting shell includes a housing and a cover plate, the cover plate is disposed on the top of the housing, the receiving cavity is disposed inside the housing, the mounting hole is disposed on the cover plate, and the first stop is disposed on the bottom wall of the cover plate and located on the outer periphery of the mounting hole.

[0015] A further embodiment is that the oscillator assembly includes a mounting base, a transducer assembly, and a fan, with both the transducer assembly and the fan housed within the mounting base, and the fan positioned above the transducer assembly.

[0016] As can be seen from the above scheme, the above settings are beneficial for heat dissipation of the transducer components.

[0017] A further embodiment is that the oscillating cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; a mechanical limiting structure is provided between the oscillating cylinder assembly and the lifting bracket, the mechanical limiting structure including a limiting block and two second stops, one of the limiting block and the second stop being provided on the oscillating cylinder assembly and the other being provided on the lifting bracket, the limiting block moving between the two second stops.

[0018] As can be seen from the above scheme, the distance that the oscillating cylinder assembly can move up and down is limited by the mechanical limiting structure through the above settings.

[0019] A further embodiment is that the oscillating cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; a distance detection component is provided between the oscillating cylinder assembly and the lifting bracket; the distance detection component includes a correspondingly provided magnetic sensor and a magnetic grating ruler, the magnetic grating ruler extending along the moving direction of the oscillating cylinder assembly, one of the magnetic sensor and the magnetic grating ruler being provided on the lifting bracket, and the other being provided on the oscillating cylinder assembly.

[0020] As can be seen from the above scheme, the above settings, through the distance detection component, facilitate the detection of the current descent distance of the oscillating cylinder component.

[0021] A further embodiment is that the oscillating cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; a positioning detection component is provided between the oscillating cylinder assembly and the lifting bracket, the positioning detection component includes a sensing plate and at least two position sensors, the two position sensors are vertically mounted on the lifting bracket, the sensing plate is mounted on the oscillating cylinder assembly, and the sensing plate moves between the two position sensors.

[0022] As can be seen from the above scheme, the above settings, through the positioning detection component, facilitate the detection of whether the vertical movement of the oscillating cylinder assembly has reached the correct position.

[0023] To achieve the second objective mentioned above, this utility model provides an ultrasonic welding machine, including a base, a column assembly, and the aforementioned head assembly capable of accurately detecting pressure. The column assembly is mounted on the base, the head assembly is mounted on the column assembly, and the height of the head assembly is adjustable. Attached Figure Description

[0024] Figure 1 This is a structural diagram of an embodiment of the head assembly of this utility model.

[0025] Figure 2This is a cross-sectional view of an embodiment of the head assembly of this utility model.

[0026] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is an exploded view of the pressure detection component in an embodiment of the head assembly of this utility model.

[0028] Figure 5 This is an exploded view from the first perspective of an embodiment of the head assembly of this utility model.

[0029] Figure 6 This is an exploded view from a second perspective of an embodiment of the head assembly of this utility model.

[0030] Figure 7 This is a structural diagram of an embodiment of the ultrasonic welding machine of this utility model.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0032] Example of nose assembly:

[0033] See Figure 1 and Figure 2 The machine head assembly 10 capable of accurately detecting pressure provided in this embodiment includes a oscillator drive assembly 1, an oscillator assembly 2, a pressure detection assembly 3, and a lifting bracket 4. The oscillator drive assembly 1 is fixedly mounted on the top plate of the lifting bracket 4, and the oscillator assembly 2 is mounted on one side of the lifting bracket 4. The oscillator drive assembly 1 drives the oscillator assembly 2 to move up and down. The oscillator drive assembly 1 can be a pneumatic cylinder or a hydraulic cylinder. The pressure detection assembly 3 is connected between the oscillator drive assembly 1 and the oscillator assembly 2 and is used to detect the pressure during welding in real time.

[0034] See Figures 2 to 4 The pressure detection assembly 3 includes a mounting shell, a connector 33, a pressure sensor 34, and a pressure head 35. The mounting shell is fixedly mounted on the top of the oscillating cylinder assembly 2. The mounting shell has a receiving cavity 311 inside, and the top wall of the mounting shell has a mounting hole 321 that communicates with the receiving cavity 311.

[0035] Pressure sensor 34 is disposed in receiving cavity 311, and connector 33 is connected between drive shaft 11 of oscillating cylinder drive assembly 1 and pressure sensor 34. The lower part of connector 33 extends into mounting hole 321 and is fixedly connected to pressure sensor 34. The top wall of receiving cavity 311 is provided with first stop part 322, which can abut against connector 33 or pressure sensor 34 to prevent pressure sensor 34 from disengaging from receiving cavity 311 when moving upward.

[0036] The pressure head 35 is mounted on the oscillator assembly 2 and positioned below the pressure sensor 34. The pressure head 35 is fixedly connected to the top of the oscillator assembly 2, and the upper part of the pressure head 35 extends into the receiving cavity 311 and abuts against the bottom wall of the pressure sensor 34. The oscillator drive assembly 1 drives the oscillator assembly 2 to move downward via the pressure sensor 34 and the pressure head 35.

[0037] The pressure sensor 34 and the pressure head 35 are connected by point contact.

[0038] In this embodiment, as Figure 3 As shown, the top of the pressure head 35 is provided with an upwardly protruding first contact surface 351. The first contact surface 351 is a curved surface, which is a three-dimensional symmetrical figure, and its axis of symmetry passes vertically through the highest point of the curved surface. In this embodiment, it is preferably a sphere. The bottom of the pressure sensor 34 is provided with a second contact surface 341. The second contact surface 341 is either a plane or a curved surface. In this embodiment, it is preferably a plane.

[0039] When the pressure head 35 is tilted relative to the pressure sensor 34 due to the influence of the oscillating cylinder assembly 2, the first contact surface 351 and the second contact surface 341 always maintain point contact.

[0040] In another embodiment, the bottom of the pressure sensor has a downwardly protruding third contact surface, which is a curved surface. This curved surface is a three-dimensional symmetrical shape, and its axis of symmetry vertically passes through the lowest point of the curved surface. In this embodiment, it is preferably a sphere. The top of the pressure head has a fourth contact surface, which can be a plane or a curved surface. In this embodiment, it is preferably a plane.

[0041] When the pressure head tilts relative to the pressure sensor due to the influence of the oscillating cylinder assembly, the third contact surface and the fourth contact surface always maintain point contact.

[0042] Combination Figure 3 and Figure 4 The mounting housing includes a housing 31 and a cover plate 32. The cover plate 32 is disposed on the top of the housing 31. A receiving cavity 311 is disposed inside the housing 31. A mounting hole 321 is disposed on the cover plate 32. A first stop portion 322 is disposed on the bottom wall of the cover plate 32 and located on the outer periphery of the mounting hole 321. The diameter of the mounting hole 321 is smaller than the diameter of the receiving cavity 311, and the first stop portion 322 protrudes inward from the cavity wall of the receiving cavity 311. A clearance hole is provided on one side of the housing 31 to avoid the cable of the pressure sensor 34.

[0043] The pressure head 35 includes an integrally formed head 352 and a connecting portion 353. The head 352 abuts against the top wall of the oscillator assembly 2, and the connecting portion 353 extends downward through the top wall of the oscillator assembly 2. The pressure head 35 is detachably connected to the oscillator assembly 2 by a locking fastener 36, which is located on the lower side of the top wall of the oscillator assembly 2 and threadedly connected to the end of the connecting portion 353 away from the head 352.

[0044] See Figure 5 and Figure 6 The oscillator assembly 2 includes a mounting base 21, a transducer assembly 22, a fan 23, and a front cover 24. Both the transducer assembly 22 and the fan 23 are housed within the mounting base 21, with the fan 23 positioned above the transducer assembly 22. The front cover 24 is detachably fitted onto the front side of the mounting base 21. The mounting base 21 or the front cover 24 has perforations for heat dissipation.

[0045] The oscillator assembly 2 is slidably connected to the lifting bracket 4 via the guide rail assembly 5. The guide rail assembly 5 includes a guide rail 51 extending in the vertical direction and two sliders 52. One of the guide rail 51 and slider 52 is mounted on the lifting bracket 4, and the other is mounted on the fixed base 21. The slider 52 can slide on the guide rail 51.

[0046] A mechanical limiting structure 6 is provided between the oscillating cylinder assembly 2 and the lifting bracket 4 to limit the maximum vertical movement of the oscillating cylinder assembly 2. The mechanical limiting structure 6 includes a limiting block 61 and two second stops 62. One of the limiting block 61 and the second stop 62 is disposed on the oscillating cylinder assembly 2, and the other is disposed on the lifting bracket 4. In this embodiment, the limiting block 61 is disposed on the top of the fixed base 21, and the two second stops 62 are disposed vertically on the lifting bracket 4, with the limiting block 61 moving between the two second stops 62. The lifting bracket 4 is provided with a downward-opening groove 41, and a groove wall is provided on the side of the groove 41 opposite to its opening, which can form the upper second stop 62. A screw is provided below the opening of the groove 41, which can form the lower second stop 62.

[0047] A distance detection component 7 is provided between the oscillating cylinder assembly 2 and the lifting support 4. The distance detection component 7 includes a magnetic sensor 71 and a magnetic scale 72, which are respectively provided. The magnetic scale 72 extends along the moving direction of the oscillating cylinder assembly 2. One of the magnetic sensor 71 and the magnetic scale 72 is provided on the lifting support 4, and the other is provided on the oscillating cylinder assembly 2.

[0048] A positioning detection component 8 is provided between the oscillating cylinder assembly 2 and the lifting support 4. The positioning detection component 8 includes a sensing element 81 and at least two position sensors 82. The two position sensors 82 are vertically mounted on the lifting support 4, and the sensing element 81 is mounted on the oscillating cylinder assembly 2. The sensing element 81 moves between the two position sensors 82. The position sensors 82 are preferably photoelectric sensors, such as proximity switches.

[0049] In this embodiment, the mechanical limiting structure 6, the distance detection component 7, and the positioning detection component 8 can be set individually or in combination, and there is no further restriction here.

[0050] Example of an ultrasonic welding machine:

[0051] See Figure 7 The ultrasonic welding machine provided in this embodiment includes a base 20, a column assembly 30, and a head assembly 10 capable of accurately detecting pressure as described in the above embodiment. The column assembly 30 is disposed on the base 20, and the head assembly 10 is disposed on the column assembly 30. A horizontal plate 201 for supporting the workpiece is provided on the base 20, and the head assembly 10 is disposed directly above the horizontal plate 201.

[0052] The height of the head assembly 10 is adjustable. The height of the head assembly 10 can be adjusted manually or electrically.

[0053] The column assembly 30 is equipped with a touch screen 40 and an electrical box 50, which are located on the left and right sides of the column assembly 30, respectively.

[0054] In summary, the point contact connection between the pressure sensor 34 and the pressure head 35 in this invention reduces the contact area between them, avoiding pressure dispersion caused by surface contact. Even if the oscillating cylinder assembly 2 tilts at a small angle during downward movement, the pressure head 35 and the pressure sensor 34 can still be evenly stressed, which helps improve the accuracy and consistency of pressure detection results. Moreover, the point contact connection also avoids local stress concentration caused by assembly errors or uneven loading, preventing damage to the pressure sensor 34 due to uneven stress and extending its service life.

[0055] Finally, it should be emphasized that the above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A head assembly capable of accurately detecting pressure, comprising a oscillator drive assembly, an oscillator assembly, a pressure detection assembly, and a lifting bracket, wherein the oscillator assembly is mounted on the lifting bracket, the pressure detection assembly is connected between the oscillator drive assembly and the oscillator assembly, and the oscillator drive assembly is capable of driving the oscillator assembly to move up and down, characterized in that: The pressure detection assembly includes a connector, a pressure sensor, and a pressure head. The connector is connected between the drive shaft of the oscillating cylinder drive assembly and the pressure sensor. The pressure head is disposed on the oscillating cylinder assembly and below the pressure sensor. The pressure sensor and the pressure head are connected by point contact.

2. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The top of the pressure head is provided with an upwardly protruding first contact surface, which is a three-dimensional symmetrical curved surface, and its axis of symmetry passes vertically through the highest point of the curved surface. The pressure sensor has a second contact surface at its bottom, which can be either a plane or a curved surface.

3. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The pressure sensor has a downwardly protruding third contact surface at its bottom. The third contact surface is a three-dimensional symmetrical curved surface, and its axis of symmetry passes vertically through the lowest point of the curved surface. The top of the pressure head is provided with a fourth contact surface, which can be a plane or a curved surface.

4. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The pressure detection assembly also includes a mounting shell, which is disposed on the top of the oscillating cylinder assembly. The mounting shell has a receiving cavity inside, and the top wall of the mounting shell has a mounting hole that communicates with the receiving cavity. The pressure sensor is disposed in the receiving cavity, the lower part of the connector extends into the mounting hole and is fixedly connected to the pressure sensor, and the top wall of the receiving cavity is provided with a first stop, which can abut against the connector or the pressure sensor. The pressure head is fixedly connected to the oscillating cylinder assembly, and the upper part of the pressure head extends into the receiving cavity and abuts against the pressure sensor.

5. The head assembly capable of accurately detecting pressure according to claim 4, characterized in that: The mounting housing includes a housing and a cover plate. The cover plate is disposed on the top of the housing, the receiving cavity is disposed inside the housing, the mounting hole is disposed on the cover plate, and the first stop portion is disposed on the bottom wall of the cover plate and located on the outer periphery of the mounting hole.

6. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The oscillating cylinder assembly includes a fixed base, a transducer assembly, and a fan. The transducer assembly and the fan are both disposed within the fixed base, and the fan is disposed above the transducer assembly.

7. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The vibration cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; A mechanical limiting structure is provided between the oscillating cylinder assembly and the lifting bracket. The mechanical limiting structure includes a limiting block and two second stops. One of the limiting block and the second stops is disposed on the oscillating cylinder assembly, and the other is disposed on the lifting bracket. The limiting block moves between the two second stops.

8. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The vibration cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; A distance detection component is provided between the oscillating cylinder assembly and the lifting bracket. The distance detection component includes a magnetic sensor and a magnetic grating ruler. The magnetic grating ruler extends along the moving direction of the oscillating cylinder assembly. One of the magnetic sensor and the magnetic grating ruler is located on the lifting bracket, and the other is located on the oscillating cylinder assembly.

9. The head assembly capable of accurately detecting pressure according to claim 1, characterized in that: The vibration cylinder assembly is slidably connected to the lifting bracket via a guide rail assembly; A positioning detection component is provided between the oscillating cylinder assembly and the lifting bracket. The positioning detection component includes a sensing plate and at least two position sensors. The two position sensors are arranged vertically on the lifting bracket, and the sensing plate is arranged on the oscillating cylinder assembly. The sensing plate moves between the two position sensors.

10. An ultrasonic welding machine, characterized in that: The device includes a base, a column assembly, and a head assembly capable of accurately detecting pressure as described in any one of claims 1 to 9, wherein the column assembly is disposed on the base, the head assembly is disposed on the column assembly, and the height of the head assembly is adjustable.

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