An ultrasonic welding machine initial pressure zero offset control system

Abstract

The application relates to the technical field of welding equipment, and discloses an initial pressure zero point offset control system of an ultrasonic welding machine, which comprises a mechanical mechanism and a control circuit; a pressure sensor for outputting a real-time pressure signal is arranged in the mechanical mechanism; the control circuit comprises an amplification circuit, an ADC module and a zero point offset adjustable circuit for receiving the pressure sensor signal; and the zero point offset adjustable circuit can adjust the circuit parameters output by the amplification circuit to eliminate zero point offset errors. The initial pressure zero point offset control system of the ultrasonic welding machine is characterized in that the pressure signal of the system is input to the amplification circuit through the pressure sensor; the weight of the mechanical mechanism itself can cause a large zero point offset of the initial value of the pressure; a zero point offset adjustable circuit is added at the amplification circuit end; the zero point offset error of the tension direction caused by the weight of the mechanical mechanism itself is eliminated by adjusting the circuit parameters; the pressure signal can be accurately transmitted; and the problems existing in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding equipment, in particular to an initial pressure zero point offset control system of an ultrasonic welding machine. BACKGROUND

[0002] The existing ultrasonic welding machine is a new type of welding equipment, and its principle is mainly that a generator generates a 20KHz (or 15KHz) high-voltage and high-frequency signal, which is converted into high-frequency mechanical vibration through a transduction system, and is applied to plastic workpieces, so that the temperature of the workpiece interface is raised through the friction between the workpiece surface and the molecules, and when the temperature reaches the melting point of the workpiece itself, the workpiece interface is rapidly melted, and then the gap between the interfaces is filled, and when the vibration stops, the workpiece is cooled and shaped under a certain pressure, thereby achieving the purpose of welding.

[0003] Furthermore, in the specific processing process, the ultrasonic energy is transmitted to the welding area through the upper welding part, and because the acoustic resistance at the interface of the two welding areas is large, local high temperature is generated, and because the plastic has poor thermal conductivity, it cannot be dissipated in time, and is accumulated in the welding area, causing the contact surface of the two plastics to melt rapidly, and after a certain pressure is applied, they are integrated into one, and when the ultrasonic wave stops acting, the pressure is maintained for a certain period of time, so that they solidify and form a solid molecular chain, thereby achieving the purpose of welding, and the welding strength can approach the original material strength, thereby ensuring high efficiency and quality of welding.

[0004] The pressure is an important control parameter in the ultrasonic welding process, and ensuring the accurate transmission of the system pressure signal is one of the means to guarantee the welding quality, but the main mechanical mechanism for implementing welding in the existing ultrasonic welding machine is in an initial state, and due to the existence of its own gravity, the corresponding pressure sensor in the equipment is in a state of being pulled and pressed, which causes a relatively large zero point offset error of the pressure signal relative to the ideal state, and the accuracy is reduced, which has an adverse effect on the subsequent welding quality. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides an initial pressure zero point offset control system of an ultrasonic welding machine, which solves the problems raised in the background art.

[0007] (II) Technical solutions

[0008] To achieve the above objectives, the present invention provides the following technical solutions: an initial pressure zero offset control system for an ultrasonic welding machine, comprising a mechanical mechanism and a control circuit, wherein a pressure sensor that outputs a pressure signal in real time is provided in the mechanical mechanism, the control circuit comprising an amplifier circuit for receiving the pressure sensor signal, an ADC module, and a zero offset adjustable circuit, wherein the zero offset adjustable circuit can adjust circuit parameters output by the amplifier circuit to eliminate zero offset errors;

[0009] The operating algorithm of the zero offset adjustable circuit includes the pressure sensor force range: -F~F (N), the pressure sensor output sensitivity: A (mv / V), the pressure sensor supply voltage: B (V), the initial counterweight of the triple group: G (Kg), the amplification factor of the amplifier circuit: K, and the negative offset value generated by the output zero of the amplifier circuit in the initial state: V offset ;

[0010] The calculation formula is: V offset =-K*(G*9.8 / F)*(A*B / 1000).

[0011] Preferably, the mechanical mechanism includes a triple assembly, a frame, and a tension spring component, the triple assembly is movably mounted on the frame via the tension spring component, the triple assembly includes a traveling component and an actuator, and the pressure sensor is installed between the traveling component and the actuator;

[0012] The traveling component includes a cylinder and a connecting shaft, and the cylinder is installed on the frame and is in driving connection with the connecting shaft.

[0013] Preferably, the pressure sensor includes a pressure sensor body, and a spring pressure block and a butterfly spring are installed at the bottom of the pressure sensor body. The butterfly spring is installed between the bottom of the pressure sensor body and the top of the actuator, and a shoulder bolt is installed between the spring pressure block and the actuator, thereby ensuring long-term stable detection output of the pressure sensor body.

[0014] Preferably, the tension spring component is composed of a first tension spring, a first spring hook, and a second spring hook, and one end of the first spring hook and the second spring hook are respectively fixed on the top surface of the frame and the bottom surface of the actuator, and the ends of both ends of the first tension spring are hook-shaped structures, and the other end of the second spring hook and the other end of the first spring hook are respectively connected to the two ends of the first tension spring. The tension spring component composed of the first tension spring, the first spring hook, and the second spring hook not only meets the elastic support requirements of the relevant structures, but is also very convenient to disassemble and install.

[0015] Preferably, the tension spring component is composed of a second tension spring, two first combination components and two second combination components, the two first combination components both include an internal threaded sleeve and a limit block, and the limit block is sleeved inside the internal threaded sleeve, the two ends of the second tension spring can respectively pass through the middle part of the internal threaded sleeve and then be respectively fixed to the middle part of the two limit blocks, the two second combination parts both include an assembly shaft, and one end of the two second combination components is respectively fixed to the top surface of the frame and the bottom surface of the actuator, the other ends of the two assembly shafts are respectively locked with the inner side spirals of the two internal threaded sleeves and then squeeze and limit the limit blocks inside the two internal threaded sleeves respectively. Another tension spring component formed by the second tension spring, the two first combination components and the two second combination components has very convenient conditions for the subsequent replacement of the second tension spring, that is, the two first combination components can be disassembled. Compared with the traditional use effect of first stretching and forcibly separating or installing the tension spring structure, the disassembly difficulty and force intensity are relatively small, and thus it can adapt to maintenance personnel from different groups.

[0016] Preferably, the surfaces of the two internally threaded sleeves are both provided with a plurality of baffles arranged along their own circumference to facilitate subsequent twisting and force application, and the surface corners of the plurality of baffles are all rounded to avoid scratches.

[0017] Preferably, the two limit blocks are both made of damping material, and the two limit blocks are respectively clamped in the interior of the internal threaded sleeve and can be linked with the second tension spring to damp and buffer the vibration at the connection between the internal threaded sleeve and the assembly shaft, thereby initially improving the stability of the connection and locking between the first assembly component and the corresponding second assembly component.

[0018] Preferably, friction balls are embedded in the surfaces of the other ends of the two assembly shafts, and the surfaces of the friction balls can contact the inner walls of the corresponding internally threaded sleeves. When the internally threaded sleeves are subjected to vibration, the corresponding friction balls dissipate friction energy of the internally threaded sleeves by rolling friction, thereby ensuring the strength and stability of the combined connection between the second assembly component and the first assembly component and avoiding the problem of loose connection.

[0019] Preferably, one end of the two assembly shafts is a T-shaped structure and is provided with a mounting hole, and the assembly shaft can use its own clearance hole as a clearance space and be detachably installed with screws and the corresponding actuator or rack, thereby facilitating subsequent modular replacement and maintenance.

[0020] Beneficial effects

[0021] The present invention provides an initial pressure zero point offset control system for an ultrasonic welding machine, which has the following beneficial effects:

[0022] 1. The ultrasonic welding machine initial pressure zero point offset control system, the pressure signal of the system is input to the amplifier circuit through the pressure sensor, the weight of the mechanical mechanism itself will cause a large zero point offset of the initial value of the pressure, and then a zero point offset adjustable circuit is added at the end of the amplifier circuit, the zero point offset error caused by the weight of the mechanical mechanism itself is eliminated by adjusting the circuit parameters, the accurate transmission of the pressure signal is realized, and the problems existing in the prior art are fully solved.

[0023] 2. The ultrasonic welding machine initial pressure zero point offset control system, the second tension spring, the two first combination components and the two second combination components form a tension spring component, during subsequent use, whether disassembled or assembled, only the inner threaded sleeve inside the two first combination components needs to be screwed, and then the two inner threaded sleeves are separated or spirally locked with the corresponding assembly shafts, so that the second tension spring can be disassembled, replaced or installed, and compared with the prior art, the disassembly difficulty and force intensity are smaller, and thus the maintenance personnel of different groups can be adapted.

[0024] 3. The ultrasonic welding machine initial pressure zero point offset control system, after the friction ball, the limiting block of the damping material, the second tension spring, the two first combination components and the two second combination components are combined and used, the two limiting blocks can be clamped in the inner threaded sleeve and can be linked with the second tension spring to dampen and buffer the vibration at the connection between the inner threaded sleeve and the assembly shaft, the stability of the connection and locking of the first combination component and the corresponding second combination component is preliminarily improved, the inner threaded sleeve is rubbed and energy dissipated by the friction ball in a rolling friction manner, and thus the combination and connection strength and stability of the second combination component and the first combination component are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The principle diagram of the structure control system of the present application is shown in the figure;

[0026] Figure 2 The cross-sectional view of the mechanical mechanism of the structure of the present application is shown in the figure;

[0027] Figure 3 The structure of the present application is shown in the figure Figure 2 The enlarged view of B in the structure of the present application is shown in the figure;

[0028] Figure 4 The three-dimensional view of the second tension spring of the structure of the present application is shown in the figure;

[0029] Figure 5 The front view of the first combination component of the structure of the present application is shown in the figure;

[0030] Figure 6 The cross-sectional view of the second combination component of the structure of the present application is shown in the figure;

[0031] Figure 7 It is a top view schematic diagram of the first assembly component of the structure of the present invention;

[0032] Figure 8 It is a top view schematic diagram of the second assembly component of the structure of the present invention.

[0033] In the figure: 1. Cylinder; 2. First spring hook; 3. Frame; 4. Connecting shaft; 5. First tension spring; 6. Actuator; 7. Second spring hook; 8. Spring pressure block; 9. Butterfly spring; 10. Shoulder bolt; 11. Pressure sensor body; 12. Amplifying circuit; 13. Zero offset adjustable circuit; 14. ADC module; 15. Second tension spring; 16. First assembly component; 161. Internally threaded sleeve; 162. Limit block; 17. Second assembly component; 171. Assembly shaft; 172. Friction ball. DETAILED DESCRIPTION

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] The present invention provides a technical solution:

[0036] See also Figure 1 An ultrasonic welding machine initial pressure zero offset control system includes a mechanical mechanism and a control circuit. The mechanical mechanism is provided with a pressure sensor that outputs a pressure signal in real time. The control circuit includes an amplifier circuit 12 that receives the pressure sensor signal, an ADC module 14, and a zero offset adjustable circuit 13. The zero offset adjustable circuit 13 can adjust the circuit parameters output by the amplifier circuit 12 to eliminate the zero offset error.

[0037] The operating algorithm of the zero offset adjustable circuit 13 includes the pressure sensor force range: -F~F (N), the pressure sensor output sensitivity: A (mv / V), the pressure sensor supply voltage: B (V), the initial counterweight of the triple group: G (Kg), the amplification factor of the amplifier circuit: K, and the negative offset value generated by the output zero of the amplifier circuit in the initial state: V offset ;

[0038] The calculation formula is V offset =-K*(G*9.8 / F)*(A*B / 1000).

[0039] During operation, the pressure sensor inputs the pressure signal to the amplifier circuit 12 through the pressure sensor body 11. Considering the problem that the initial pressure value may have a large zero offset due to the self-weight of the mechanical mechanism, a zero offset adjustable circuit 13 is added to the amplifier circuit 12. The zero offset adjustable circuit 13 adjusts the circuit parameters of the pressure signal transmitted to the amplifier circuit 12. The specific calculation formula is as described above, that is, V offset =-K*(G*9.8 / F)*(A*B / 1000), thereby eliminating the zero point offset error in the tension direction caused by the counterweight of the mechanical mechanism itself, achieving accurate transmission of the pressure signal, and when the counterweight of the subsequent mechanical mechanism is changed, the zero point offset adjustable circuit 13 can still perform offset adjustment, fully meeting different usage requirements.

[0040] See also Figure 2-Figure 3 The mechanical mechanism includes a triple assembly, a frame 3 and a tension spring component. The triple assembly is movably installed with the frame 3 through the tension spring component. The triple assembly includes a traveling component and an actuator. The pressure sensor is installed between the traveling component and the actuator.

[0041] The travel component includes a cylinder 1 and a connecting shaft 4. The cylinder 1 is mounted on a frame 3 and is in driving connection with the connecting shaft 4. The pressure sensor includes a pressure sensor body 11. A spring pressure block 8 and a butterfly spring 9 are mounted at the bottom of the pressure sensor body 11. The butterfly spring 9 is mounted between the bottom of the pressure sensor body 11 and the top of the actuator 6. A shoulder bolt 10 is installed between the spring pressure block 8 and the actuator 6 to ensure long-term stable detection output of the pressure sensor body 11.

[0042] The tension spring component is composed of a first tension spring 5, a first spring hook 2, and a second spring hook 7, and one end of the first spring hook 2 and the second spring hook 7 are respectively fixed on the top surface of the frame 3 and the bottom surface of the actuator 6, and the ends of both ends of the first tension spring 5 are hook-shaped structures, and the other end of the second spring hook 7 and the other end of the first spring hook 2 are respectively connected to the two ends of the first tension spring 5 in a sleeve manner. The tension spring component composed of the first tension spring 5, the first spring hook 2, and the second spring hook 7 not only meets the elastic support requirements of the relevant structures, but is also very convenient to disassemble and install.

[0043] During use, considering that the mechanical mechanism still needs to maintain its own structure stable during subsequent reciprocating operations, a tension spring component consisting of the first tension spring 5, the first spring hook 2, and the second spring hook 7 is used to provide auxiliary support for the triple assembly and provide favorable auxiliary conditions for eliminating zero point offset errors.

[0044] See also Figure 4-Figure 6The tension spring component is composed of a second tension spring 15, two first assembly components 16 and two second assembly components 17. The two first assembly components 16 each include an internal threaded sleeve 161 and a limit block 162, and the limit block 162 is sleeved inside the internal threaded sleeve 161. The two ends of the second tension spring 15 can respectively pass through the middle of the internal threaded sleeve 161 and then be fixed to the middle of the two limit blocks 162 respectively. The two second assembly components 17 each include an assembly shaft 171, and one end of the two second assembly components 17 is respectively fixed to the top surface of the frame 3 and the bottom surface of the actuator 6. The two assembly components 17 are The other end of the mounting shaft 171 is respectively locked with the inner spirals of the two internally threaded sleeves 161 and then squeezed and limited by the limit blocks 162 inside the two internally threaded sleeves 161. The second tension spring 15, the two first assembly components 16, and the two second assembly components 17 form another tension spring component, which is very convenient for subsequent replacement of the second tension spring 15. That is, the two first assembly components 16 can be disassembled. Compared with the traditional method of first stretching the tension spring structure to make way and forcibly separating or installing it, the disassembly difficulty and force intensity are both smaller, thereby being suitable for different groups of maintenance personnel.

[0045] During use, considering the convenience and labor-saving replacement of the subsequent tension spring structure, another tension spring component formed by the second tension spring 15, the two first combination components 16 and the two second combination components 17 can meet the requirements. The specific principle is as follows: whether it is disassembled or assembled, it is only necessary to twist the internal threaded sleeves 161 inside the two first combination components 16, and then separate or screw-lock the two internal threaded sleeves 161 with their corresponding assembly shafts 171, so that the second tension spring 15 can be disassembled, replaced or installed. Compared with the use effect of first stretching and giving way and forced separation or installation between the first tension spring 5 and the first spring hook 2 and the second spring hook 7, the disassembly difficulty and force intensity are both smaller, and thus it can adapt to different groups of maintenance personnel.

[0046] The surfaces of the two internally threaded sleeves 161 are both circumferentially arranged with several baffles to facilitate subsequent twisting and force application. The surface corners of the several baffles are all rounded to avoid scratches. The two limit blocks 162 are both made of damping material, and the two limit blocks 162 are respectively clamped in the interior of the internally threaded sleeve 161 and can be linked with the second tension spring 15 to damp and buffer the vibration at the connection between the internally threaded sleeve 161 and the assembly shaft 171, thereby preliminarily improving the stability of the connection and locking between the first combination component 16 and the corresponding second combination component 17.

[0047] See also Figure 4-Figure 8, the surfaces of the other ends of the two assembly shafts 171 are embedded with friction balls 172, and the surfaces of the friction balls 172 can contact the inner walls of the corresponding internally threaded sleeves 161, and when the internally threaded sleeves 161 are subjected to vibration, the corresponding friction balls 172 dissipate friction energy of the internally threaded sleeves 161 by rolling friction, thereby ensuring the strength and stability of the combined connection between the second assembly component 17 and the first assembly component 16, and avoiding the problem of loose connection. One end of the two assembly shafts 171 is a T-shaped structure and is provided with mounting holes, and the assembly shafts 171 can use their own makeshift holes as makeshift spaces, and can be detachably installed with screws and the corresponding actuators 6 or racks 3, thereby facilitating subsequent modular replacement and maintenance.

[0048] During use, taking into account the problem that the second tension spring 15 is subjected to vibration for a long time during subsequent use, a friction ball 172 and a limit block 162 formed of damping material are added. In the subsequent process of linkage with the second tension spring 15, the two limit blocks 162 are respectively clamped in the inside of the internal threaded sleeve 161 and can be linked with the second tension spring 15 to damp and buffer the vibration at the connection between the internal threaded sleeve 161 and the assembly shaft 171, thereby preliminarily improving the stability of the connection and locking between the first combination component 16 and the corresponding second combination component 17. The friction ball 172 dissipates friction energy on the internal threaded sleeve 161 by rolling friction, thereby further improving the strength and stability of the combined connection between the second combination component 17 and the first combination component 16.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An initial pressure zero offset control system for an ultrasonic welding machine, comprising a mechanical mechanism and a control circuit, wherein a pressure sensor for outputting a real-time pressure signal is provided within the mechanical mechanism, and wherein: The control circuit comprises an amplifier circuit (12) for receiving a pressure sensor signal, an ADC module (14), and a zero offset adjustable circuit (13), wherein the zero offset adjustable circuit (13) eliminates a zero offset error by adjusting circuit parameters output by the amplifier circuit (12); The operating algorithm of the zero offset adjustable circuit (13) includes the pressure sensor force range: -F~F (N), the pressure sensor output sensitivity: A (mv / V), the pressure sensor supply voltage: B (V), the initial counterweight of the triple group: G (Kg), the amplification factor of the amplifier circuit: K, and the negative offset value generated by the output zero of the amplifier circuit in the initial state: V offset ; The calculation formula is: V offset =-K*(G*9.8 / F)*(A*B / 1000).

2. The ultrasonic welding machine initial pressure zero offset control system according to claim 1, characterized in that: The mechanical mechanism comprises a triple assembly, a frame (3) and a tension spring component, the triple assembly is movably mounted on the frame (3) via the tension spring component, the triple assembly comprises a travel component and an actuator, and the pressure sensor is mounted between the travel component and the actuator; The traveling component comprises a cylinder (1) and a connecting shaft (4), and the cylinder (1) is mounted on a frame (3) and is in driving connection with the connecting shaft (4).

3. The ultrasonic welding machine initial pressure zero offset control system according to claim 1, characterized in that: The pressure sensor comprises a pressure sensor body (11), and a spring pressure block (8) and a butterfly spring (9) are installed at the bottom of the pressure sensor body (11), the butterfly spring (9) is installed between the bottom of the pressure sensor body (11) and the top of the actuator (6), and a shoulder bolt (10) is installed between the spring pressure block (8) and the actuator (6).

4. The ultrasonic welding machine initial pressure zero offset control system according to claim 2, characterized in that: The tension spring component is composed of a first tension spring (5), a first spring hook (2), and a second spring hook (7), and one end of the first spring hook (2) and the second spring hook (7) are respectively fixed on the top surface of the frame (3) and the bottom surface of the actuator (6), the ends of both ends of the first tension spring (5) are hook-shaped structures, and the other end of the second spring hook (7) and the other end of the first spring hook (2) are respectively connected to the two ends of the first tension spring (5).

5. The ultrasonic welding machine initial pressure zero offset control system according to claim 2, characterized in that: The tension spring component is composed of a second tension spring (15), two first combination components (16) and two second combination components (17), the two first combination components (16) each include an internal threaded sleeve (161) and a limit block (162), and the limit block (162) is sleeved inside the internal threaded sleeve (161), and both ends of the second tension spring (15) can respectively pass through the middle of the internal threaded sleeve (161) and then be fixed to the middle of the two limit blocks (162) respectively; The two second assembly components (17) each include an assembly shaft (171), and one end of the two second assembly components (17) is fixed to the top surface of the frame (3) and the bottom surface of the actuator (6), respectively. The other ends of the two assembly shafts (171) are respectively locked with the inner spirals of the two internally threaded sleeves (161) and then squeeze and limit the limiting blocks (162) inside the two internally threaded sleeves (161).

6. The ultrasonic welding machine initial pressure zero offset control system according to claim 5, characterized in that: The surfaces of the two internally threaded sleeves (161) are both provided with a plurality of baffles arranged along their own circumference, and the surface corners of the plurality of baffles are all rounded structures.

7. The ultrasonic welding machine initial pressure zero offset control system according to claim 5, characterized in that: The two limit blocks (162) are both made of damping material, and the two limit blocks (162) are respectively clamped inside the internal threaded sleeve (161) and can be linked with the second tension spring (15) to damp and buffer the vibration at the connection between the internal threaded sleeve (161) and the assembly shaft (171).

8. The initial pressure zero point offset control system of an ultrasonic welding machine according to claim 5, characterized in that: The surfaces of the other ends of the two assembly shafts (171) are both embedded with friction balls (172), and the surfaces of the friction balls (172) can contact the inner wall of the corresponding internal threaded sleeve (161). When the internal threaded sleeve (161) is subjected to vibration, the corresponding friction balls (172) dissipate friction energy of the internal threaded sleeve (161) in a rolling friction manner.

9. The initial pressure zero offset control system of an ultrasonic welding machine according to claim 5, characterized in that: One end of each of the two assembly shafts (171) is a T-shaped structure and is provided with a mounting hole. The assembly shaft (171) can be detachably mounted with the corresponding actuator (6) or rack (3) using its own clearance hole as a clearance space by means of screws.

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