Trigger pressure regulating mechanism, trigger pressure regulating method and device

Abstract

The present invention provides a trigger pressure regulating mechanism, a trigger pressure regulating method and a device. The trigger pressure regulating mechanism includes: a base; a first elastic mechanism disposed on the base; a second elastic mechanism disposed on the base; an adjusting member that controls the first elastic mechanism to work and outputs a trigger pressure value within a first range corresponding to a first pressure trigger range when the input of the ultrasonic welding machine is within the first pressure trigger range; and controls the first elastic mechanism and the second elastic mechanism to work simultaneously and outputs a trigger pressure value within a second range corresponding to a second pressure trigger range when the input is within the second pressure trigger range, and the value of the second pressure trigger range is greater than the value of the first pressure trigger range. By means of the present invention, the problems in the related art that the welding quality is relatively poor due to unstable trigger pressure and the trigger pressure range is too small are solved, and the effect of improving the welding quality is achieved.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic welding, and in particular, to a trigger pressure regulating mechanism, a trigger pressure regulating method, and a device. Background Art

[0002] According to the process requirements for ultrasonic welding of plastic workpieces, a certain pressure, i.e., the trigger pressure, is usually applied to the workpieces in advance before the ultrasonic welding machine triggers the ultrasonic waves. In order to meet different welding process requirements, the ultrasonic welding machine needs to precisely control the trigger pressure. The control principle of the welding machine is as follows: A cylinder (or a servo system) drives a transducer, a welding head, and a corresponding pressure trigger mechanism to move towards the plastic welding workpiece until it contacts the surface of the welding workpiece, and gradually applies pressure; when the contact pressure reaches the set trigger pressure value, the ultrasonic generator controls the transducer to emit ultrasonic waves, and the welding head obtains an amplitude and performs the welding of the welding workpiece.

[0003] When there is a difference between the set trigger pressure and the actual pressure, such as when the actual pressure is less than the set trigger pressure, the transducer emits ultrasonic waves in advance, and the plastic welding workpiece will have a poor welding phenomenon; if the actual pressure is greater than the set trigger pressure, the transducer emits ultrasonic waves later than the pressure required by the process, resulting in an excessive welding pressure and causing damage to the plastic welding workpiece.

[0004] The quality of ultrasonic plastic welding of plastic workpieces is related to the following factors: ultrasonic frequency, output amplitude, applied pressure, and welding time. The ultrasonic welding machine has various ultrasonic trigger modes, such as time, pressure, position, etc. For the most commonly used pressure trigger mode, the welding head presses down to the surface of the welding workpiece, gradually applies pressure to the welding workpiece, and when the pressure reaches a certain value, the transducer emits ultrasonic waves.

[0005] For different plastic welding workpieces, such as materials and thicknesses, corresponding ultrasonic welding processes need to be formulated, and at the same time, corresponding ultrasonic trigger pressures need to be set.

[0006] In the related art, the motion mechanism of a general ultrasonic plastic welding machine is mainly controlled by a cylinder or a servo system, and the pressure trigger mechanisms mainly include:

[0007] (1) Mechanical pressure trigger control mode: A pressure trigger control system composed of a compression spring module in cooperation with an involute spiral disk and a photoelectric switch;

[0008] (2) S-type pressure sensor control mode.

[0009] The mechanical pressure trigger structure is as Figure 1 and 2 shown:

[0010] The photoelectric switch 102 is installed on the spring base 101, and multiple compression springs 103 are symmetrically distributed and installed in the grooves of the spring base 101; the involute spiral disk 107 is fixed on the spring L-shaped pressing plate 104 through the knob 106 and the locking retaining ring 105; the coupling shaft 108 is bolted to the spring L-shaped pressing plate 104, and the top threaded hole is connected to the driving component cylinder or servo system of the ultrasonic plastic welding machine.

[0011] Rotate the knob 106 to turn the involute spiral disk 107, and select the corresponding trigger pressure according to the scale on the spiral disk. When the involute spiral disk 107 rotates to the required trigger pressure, the relative position relationship between the involute spiral disk 107 and the photoelectric switch 102 is set.

[0012] When the coupling shaft 108 is subjected to the pressure of the power source and moves downward, it pushes the spring L-shaped pressing plate 104, and then pushes multiple compression springs 103; at the same time, there will be a certain displacement between the involute spiral disk and the photoelectric switch, controlling the light passing and light blocking of the photoelectric switch.

[0013] The logic control method of this pressure trigger mechanism is as Figure 3 shown:

[0014] Step S302, under the control of the power source, the cylinder or servo drive system applies pressure to the spring module group of the compression pressure trigger mechanism through the coupling shaft 108.

[0015] Step S304, the spring module presses down a distance, driving the involute spiral disk to move in the photoelectric switch and blocking the LED signal in the photoelectric switch.

[0016] Step S306, the photoelectric on-off converter converts the light-off signal of the photoelectric switch into an electric control signal.

[0017] Step S308, control the ultrasonic generator to emit ultrasound.

[0018] As described above, the pressure trigger mechanism in the related technology mainly utilizes the compression deformation amount of multiple compression springs to generate a displacement of the spiral disk in the photoelectric switch, thereby controlling the on and off of the light signal of the photoelectric switch.

[0019] By rotating the involute spiral disk 107, adjust the position of the involute spiral disk in the photoelectric switch 102. When the cylinder or servo drive presses down, the welding head contacts the plastic welding workpiece, and multiple compression springs 103 start to buffer and compress, driving the involute spiral disk 107 to move downward. Once the involute spiral disk blocks the light signal of the photoelectric switch 102, the photoelectric switch determines that the compression force of the multiple compression springs has reached the set trigger pressure, thereby giving an electric control signal to the ultrasonic generator, and the transducer emits ultrasound and transmits it to the welding head for plastic workpiece welding.

[0020] The above mechanical pressure trigger adjustment mechanism sets the trigger pressure by setting the position of the involute spiral disk 107 in the photoelectric switch 103. The initial positions of the involute spiral disk and the photoelectric switch are not precise enough, and if the manufacturing quality of the involute spiral disk is not precise, it will directly affect the accuracy of the set trigger pressure.

[0021] At the same time, this mechanical pressure trigger mechanism feeds back pressure through multiple compression springs 103, and the minimum trigger pressure needs to be set above a certain pressure value. For the welding process requirements of different plastic welding workpieces, such as when the trigger pressure of the welding workpiece needs to be set at a smaller pressure value, it is very difficult for the existing pressure trigger mechanism to achieve, and it is necessary to manually remove some compression springs to reduce the compression force of the springs.

[0022] In view of the problems in the mechanical pressure trigger control mode in the related technology, such as unstable pressure trigger, poor welding quality, and a relatively small trigger pressure range, no effective solution has been proposed yet. Summary of the Invention

[0023] To solve the above problems, an embodiment of the present invention provides a trigger pressure adjustment mechanism, a trigger pressure adjustment method, and a device.

[0024] On the one hand, a trigger pressure adjustment mechanism is provided, which is located in an ultrasonic welding machine and includes: a base;

[0025] A first elastic mechanism, which is arranged on the base;

[0026] A second elastic mechanism, which is arranged on the base;

[0027] An adjusting member, when the input of the ultrasonic welding machine is within the first pressure trigger range, controls the first elastic mechanism to work and outputs the first range trigger pressure value corresponding to the first pressure trigger range; when the input is within the second pressure trigger range, controls the first elastic mechanism and the second elastic mechanism to work simultaneously and outputs the second range trigger pressure value corresponding to the second pressure trigger range, and the second range trigger pressure value is greater than the first range pressure trigger value.

[0028] Preferably, it further includes:

[0029] A displacement sensor, which detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or,

[0030] The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0031] Preferably, the adjusting member includes:

[0032] A spring base is disposed on the base, one end of the first elastic mechanism is disposed on the spring base, and one end of the second elastic mechanism is disposed on the spring base;

[0033] A spring pressing plate is provided with a first number of blind holes and a second number of through holes. One end of the first elastic mechanism is installed in the first number of blind holes, and the other end is installed on the spring base. One end of the second elastic mechanism is installed in the second number of through holes, and the other end is installed on the spring base;

[0034] An adjusting plate is connected to the spring pressing plate through an adjusting knob, and is provided with the second number of holes for installing the second number of cylindrical pins, and a part of the large radius end of each of the second number of cylindrical pins is inserted into the through holes of the spring pressing plate.

[0035] Preferably, it further includes:

[0036] An adjusting knob is connected to the adjusting plate, and under the action of the spring force, the adjusting plate is adjusted to move up and down.

[0037] Preferably, when the input of the ultrasonic welding machine is within the first pressure trigger range, the adjusting knob controls the adjusting plate to move upward to a first preset position, and the first preset position is that the distance between the lower end of the second number of cylindrical pins and the upper end of the elastic force in the second elastic mechanism reaches a preset value.

[0038] Preferably, when the input of the ultrasonic welding machine is within the first pressure trigger range, the adjusting knob controls the adjusting plate to move downward to a second preset position, and the second preset position includes: the lower surface of the adjusting plate contacts the upper surface of the spring pressing plate.

[0039] Preferably, it further includes:

[0040] A displacement sensor pressing piece is disposed on the spring pressing plate and moves up and down with the spring pressing plate;

[0041] Wherein, when the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal.

[0042] Preferably, it further includes:

[0043] The first elastic mechanism includes eight springs;

[0044] The second elastic mechanism includes twelve springs.

[0045] On the other hand, an ultrasonic welding machine is further provided, including: the trigger pressure adjusting mechanism according to the above.

[0046] On yet another aspect, a trigger pressure adjusting method is further provided, including:

[0047] The ultrasonic welding machine receives an input pressure trigger range, where the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range;

[0048] The ultrasonic welding machine selects the first elastic mechanism to work through an adjusting member according to the input pressure trigger range; or, selects the first elastic mechanism and the second elastic mechanism to work simultaneously; where

[0049] The ultrasonic welding machine includes a base;

[0050] A first elastic mechanism, arranged on the base;

[0051] A second elastic mechanism, arranged on the base;

[0052] When the input of the ultrasonic welding machine is the first pressure trigger range, the adjusting member controls the first elastic mechanism to work and outputs a first range trigger pressure value corresponding to the first pressure trigger range; when the input is the second pressure trigger range, the adjusting member controls the first elastic mechanism and the second elastic mechanism to work simultaneously and outputs a second range trigger pressure value corresponding to the second pressure trigger range, and the second range pressure trigger range value is greater than the first range pressure trigger range value.

[0053] Preferably, the above method further includes:

[0054] A displacement sensor on the ultrasonic welding machine detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or,

[0055] The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0056] The above method further includes:

[0057] The displacement sensor pressing plate on the ultrasonic welding machine is arranged on the spring pressing plate and moves up and down with the spring pressing plate;

[0058] When the displacement sensor pressing plate moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal and send it to the microprogram controller MCU.

[0059] The MCU triggers the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves.

[0060] On the other hand, a trigger pressure regulating device is also provided, which is applied to an ultrasonic welding machine and includes:

[0061] A base;

[0062] A receiver for receiving the input pressure trigger range, where the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range;

[0063] An adjusting member for selecting the first elastic mechanism to work according to the input pressure trigger range; or, selecting the first elastic mechanism and the second elastic mechanism to work simultaneously; where

[0064] The first elastic mechanism is arranged on the base;

[0065] The second elastic mechanism is arranged on the base;

[0066] When the input of the ultrasonic welding machine is the first pressure trigger range, the adjusting member controls the first elastic mechanism to work and outputs the first range trigger pressure value corresponding to the first pressure trigger range; when the input is the second pressure trigger range, the adjusting member controls the second elastic mechanism to work and outputs the second range trigger pressure value corresponding to the second pressure trigger range, and the second pressure trigger range value is greater than the first pressure trigger range value.

[0067] Preferably, the above device further includes:

[0068] A displacement sensor for detecting the compression displacement of the elastic force of the first elastic mechanism, generating a first displacement signal, triggering the pressure of the ultrasonic welding machine, and outputting the first range trigger pressure value; or,

[0069] The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0070] Preferably, it further includes:

[0071] The displacement sensor pressing piece is arranged on the spring pressing plate and moves up and down along with the spring pressing plate;

[0072] When the displacement sensor pressing piece moves along with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal and send it to the microprogram controller MCU;

[0073] The MCU is used to trigger the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves according to the displacement signal.

[0074] Through the technical solution provided by the invention, the output of trigger pressures in different ranges is realized through the first elastic mechanism and the second elastic mechanism, the selection range of pressure triggering is expanded, and the welding efficiency is improved. Description of the Drawings

[0075] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0076] Figure 1 is a schematic diagram of the pressure triggering mechanism of an ultrasonic plastic welding machine according to the related art Figure 1 ;

[0077] Figure 2 is a schematic diagram of the pressure triggering mechanism of an ultrasonic plastic welding machine according to the related art Figure 2 ;

[0078] Figure 3 is a control flow chart of the pressure triggering mechanism of an ultrasonic plastic welding machine according to the related art;

[0079] Figure 4 is a schematic diagram of the trigger pressure adjustment mechanism according to an embodiment of the present invention Figure 1 ;

[0080] Figure 5 is a schematic diagram of the trigger pressure adjustment mechanism according to an embodiment of the present invention Figure 2 ;

[0081] Figure 6 is a schematic control diagram of the pressure triggering mechanism of an ultrasonic plastic welding machine according to an embodiment of the present invention. Detailed Embodiments

[0082] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0083] On the one hand, a trigger pressure adjustment mechanism is provided, which is located in the ultrasonic welding machine and includes: a base;

[0084] The first elastic mechanism is arranged on the base;

[0085] The second elastic mechanism is arranged on the base;

[0086] The adjusting member controls the first elastic mechanism to work and outputs the first range trigger pressure value corresponding to the first pressure trigger range when the input of the ultrasonic welding machine is within the first pressure trigger range; when the input is within the second pressure trigger range, it controls the first elastic mechanism and the second elastic mechanism to work simultaneously and outputs the second range trigger pressure value corresponding to the second pressure trigger range, and the second range trigger pressure value is greater than the first range pressure trigger value.

[0087] Through the above implementation, the first elastic mechanism and the second elastic mechanism are used to realize the output of trigger pressures in different ranges, expanding the selection range of pressure triggers.

[0088] Preferably, the above device further includes: a displacement sensor that detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or,

[0089] The displacement sensor detects the compression displacement of the elastic forces when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0090] Preferably, the adjusting member includes:

[0091] A spring base is arranged on the base, one end of the first elastic mechanism is arranged on the spring base, and one end of the second elastic mechanism is arranged on the spring base;

[0092] A spring pressing plate is provided with a first number of blind holes and a second number of through holes. One end of the first elastic mechanism is installed in the first number of blind holes, and the other end is installed on the spring base. One end of the second elastic mechanism is installed in the second number of through holes, and the other end is installed on the spring base;

[0093] An adjusting plate is connected to the spring pressing plate through an adjusting knob and is provided with the second number of holes for installing the second number of cylindrical pins, and a part of the large-radius end of each of the second number of cylindrical pins is inserted into the through holes of the spring pressing plate.

[0094] The adjusting plate is connected to the spring pressure plate through an adjusting knob and an elastic member, and is provided with a second number of holes for installing a second number of cylindrical pins, and one end portion with a larger radius of each of the second number of cylindrical pins is inserted into the through holes of the spring pressure plate.

[0095] In this preferred embodiment, the elastic force mechanism (spring module) for triggering pressure can be quickly switched to two different elastic force mechanisms (compression spring module groups) through a mechanical adjustment mechanism to achieve a variety of different triggering pressure control ranges, and the pressure triggering mechanism can select different gears as needed and can be quickly switched.

[0096] Preferably, it further includes: an adjusting knob, connected to the adjusting plate, and controlling the up and down movement of the adjusting plate under the action of spring force.

[0097] Preferably, when the input of the ultrasonic welding machine is within the first pressure trigger range, the adjusting knob adjusts the adjusting plate to move upward to a first preset position, and the first preset position is such that the distance between the lower end of the second number of cylindrical pins and the upper end of the elastic force in the first elastic force mechanism reaches a preset value.

[0098] Preferably, when the input of the ultrasonic welding machine is within the second pressure trigger range, the adjusting knob adjusts the adjusting plate to move downward to a second preset position, and the second preset position includes: the lower surface of the adjusting plate contacts the upper surface of the spring pressure plate.

[0099] Preferably, the above-mentioned adjusting mechanism further includes: a displacement sensor pressing piece, arranged on the spring pressure plate and moving up and down with the spring pressure plate;

[0100] Wherein, when the displacement sensor pressing piece moves with the spring pressure plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal.

[0101] Through this preferred embodiment, the displacement amount is converted into an electromechanical signal by a micro displacement sensor, improving the accuracy and stability of pressure control.

[0102] Preferably, the first elastic force mechanism includes 8 springs;

[0103] The second elastic force mechanism includes 12 springs.

[0104] On the other hand, an ultrasonic welding machine is also provided, including: the triggering pressure adjusting mechanism according to the above.

[0105] On yet another aspect, a triggering pressure adjusting method is also provided, including:

[0106] The ultrasonic welding machine receives the input pressure trigger range, wherein the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range;

[0107] The ultrasonic welding machine selects the first elastic mechanism to work through the adjusting member according to the input pressure trigger range; or, selects the first elastic mechanism and the second elastic mechanism to work simultaneously; wherein,

[0108] The ultrasonic welding machine includes a base;

[0109] A first elastic mechanism, arranged on the base;

[0110] A second elastic mechanism, arranged on the base;

[0111] The adjusting member controls the first elastic mechanism to work and outputs the first range trigger pressure value corresponding to the first pressure trigger range when the input of the ultrasonic welding machine is the first pressure trigger range; when the input is the second pressure trigger range, controls the first elastic mechanism and the second elastic mechanism to work simultaneously, and outputs the second range trigger pressure value corresponding to the second pressure trigger range, and the second range pressure trigger range value is greater than the first range pressure trigger range value.

[0112] Preferably, the above method further includes:

[0113] The displacement sensor on the ultrasonic welding machine detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or,

[0114] The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0115] Preferably, the above method further includes:

[0116] The displacement sensor pressing piece on the ultrasonic welding machine is arranged on the spring pressing plate and moves up and down with the spring pressing plate;

[0117] When the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor, generates a displacement signal and sends it to the microprogram controller MCU,

[0118] The MCU triggers the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves.

[0119] On the other hand, a trigger pressure adjusting device is further provided, which is applied to an ultrasonic welding machine and includes:

[0120] A base;

[0121] A receiver for receiving an input pressure trigger range, where the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range;

[0122] An adjusting member for selecting the first elastic mechanism to work according to the input pressure trigger range; or, selecting the first elastic mechanism and the second elastic mechanism to work simultaneously; where

[0123] A first elastic mechanism is provided on the base;

[0124] A second elastic mechanism is provided on the base;

[0125] The adjusting member, when the input of the ultrasonic welding machine is the first pressure trigger range, controls the first elastic mechanism to work and outputs a first range trigger pressure value corresponding to the first pressure trigger range; when the input is the second pressure trigger range, controls the second elastic mechanism to work and outputs a second range trigger pressure value corresponding to the second pressure trigger range, and the second pressure trigger range value is greater than the first pressure trigger range value.

[0126] Preferably, it further includes:

[0127] A displacement sensor for detecting the compression displacement of the elastic force of the first elastic mechanism, generating a first displacement signal, triggering the pressure of the ultrasonic welding machine, and outputting the first range trigger pressure value; or,

[0128] The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

[0129] Preferably, it further includes:

[0130] A displacement sensor pressing piece is provided on the spring pressing plate and moves up and down with the spring pressing plate;

[0131] When the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal and send it to the microprogram controller MCU;

[0132] The MCU is used to trigger the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves according to the displacement signal.

[0133] Preferred embodiment

[0134] This preferred embodiment provides a trigger pressure control method, which is applied to an ultrasonic plastic welding machine. In this preferred embodiment, according to the process requirements of different plastic workpieces to be welded, it can quickly switch to different trigger pressure ranges to accurately set the corresponding trigger pressure. The trigger pressure can be set to two range segments: a small pressure trigger pressure range and a large pressure trigger pressure range.

[0135] The structure of the trigger pressure adjustment mechanism in this preferred embodiment will be described below. Figure 4 is a schematic diagram of the trigger pressure adjustment mechanism according to an embodiment of the present invention Figure 1 , Figure 5 is a schematic diagram of the trigger pressure adjustment mechanism according to an embodiment of the present invention Figure 2 , and the following will be described in detail in conjunction with Figure 4 and Figure 5 .

[0136] As Figure 4 and 5 shown, 20 compression springs 317 are symmetrically distributed and embedded in the grooves of the spring base 301; the spring pressure plate 303 and the coupling shaft 307 are connected together by screws 318; the spring pressure plate 303 is fastened to the spring base 301 by two precision screws 302, and the spring pressure plate 303 can move up and down with the smooth rod part of the precision screw as the guide rod.

[0137] It should be noted that in this preferred embodiment, only 20 compression springs are taken as an example for illustration. In practice, those skilled in the art can select the solutions in related technologies as the elastic mechanism according to actual needs, and can select the number of springs according to the actual output pressure range value.

[0138] Twelve through holes and eight blind holes are symmetrically distributed on the spring pressure plate 303; the bottom planes of the eight blind holes are in contact with the top planes of the eight compression springs 317;

[0139] Twelve small holes are symmetrically distributed on the adjusting plate 305, and 12 shoulder-mounted cylindrical pins 309 can be installed. The large-diameter end parts of the 12 cylindrical pins 309 are tightly inserted into the 12 through holes of the spring pressure plate 303.

[0140] The adjusting plate 305 is connected to the spring pressure plate 303 through two threaded adjusting knobs 306 and two compression springs 304. The adjusting plate 305 can move up and down with the adjusting knob 306 as the guide; two screws 308 are installed on the coupling shaft 307 to serve as the upper limit of the adjusting plate 305.

[0141] The micro displacement sensor 313 is fastened to the support plate 314 by 4 screws 312. The support plate 314 is positioned on the spring base 301 by a cylindrical pin 316 and fastened to the spring base 301 by a screw 315. The displacement sensor pressing piece 310 is fastened to the spring pressing plate 303 by a screw 311 and can move up and down together with the spring pressing plate 303.

[0142] In this preferred embodiment, 20 springs are taken as an example of the elastic mechanism for illustration. 8 springs are equivalent to the first elastic mechanism, and 12 springs are equivalent to the second elastic mechanism.

[0143] The trigger pressure adjustment of this structure will be described in detail below.

[0144] (1) When selecting the small pressure trigger pressure range (equivalent to the first pressure trigger range in the above embodiment):

[0145] Rotate the adjustment knob 306. Under the action of the compression spring 304, the adjustment plate 305 moves upward against the adjustment plate 305 until the upper surface of the adjustment plate 305 contacts the limit screw 308. In this state, the lower planes of the 12 shoulder bolts 309 installed on the adjustment plate 305 are separated from the corresponding 12 compression springs 317 by more than 5 mm.

[0146] When the coupling shaft 307 drives the spring pressing plate 303 and the displacement sensor pressing piece 310 installed on the spring pressing plate 303 to move downward under the action of the power source; because there is a certain distance between the adjustment plate 305 and the spring pressing plate 303 under the action of the adjustment knob 306 and the compression spring 304, the bottom planes of the 12 shoulder bolts installed on the adjustment plate 305 will not contact the 12 springs installed on the spring base 301; that is, in this mode, the 12 compression springs 317 are ineffective. When the displacement sensor pressing piece 310 moves downward, it will push the telescopic rod on the micro displacement sensor 313, so that the micro displacement sensor 313 obtains a displacement signal to achieve pressure triggering.

[0147] (2) When selecting the large pressure trigger pressure range (equivalent to the second pressure trigger range above):

[0148] Rotate the adjustment knob 306. Under the action of the thread pair between the adjustment knob 306 and the spring pressing plate 303, the adjustment plate 305 drives the adjustment plate 305 to move downward until the lower surface of the adjustment plate 305 is in close contact with the upper surface of the spring pressing plate 303. In this state, the lower planes of the 12 shoulder bolts 309 installed on the adjustment plate 305 contact the upper planes of the corresponding 12 compression springs 317.

[0149] When the coupling shaft 307 drives the spring pressure plate 303 and the displacement sensor piece 310 mounted on the spring pressure plate 303 to move downward under the action of the power source; because the adjusting plate 305 and the spring pressure plate 303 are under the action of the adjusting knob 306, the bottom planes of the 12 shoulder pins mounted on the adjusting plate 305 generate pressure on the upper surfaces of the 12 springs mounted on the spring base 301; that is, in this mode, the 12 compression springs 317 and the other 8 compression springs 317 act simultaneously to form 20 compression springs 317 for working. When the displacement sensor piece 310 moves downward, it will push the telescopic rod on the micro displacement sensor 313, so that the micro displacement sensor 313 obtains a displacement signal to achieve pressure triggering.

[0150] It should be noted that in the above embodiments, the first elastic mechanism and the second elastic mechanism both adopt the implementation mode of compression springs. Those skilled in the art can, according to actual needs, the first elastic mechanism and the second elastic mechanism can adopt the same mechanism, for example, both adopt compression springs, or can adopt different mechanisms.

[0151] This embodiment provides a pressure triggering method. Figure 6 It is a control schematic diagram of the pressure triggering mechanism of the ultrasonic plastic welding machine according to the embodiment of the present invention. Combining the above embodiments and preferred embodiments, the following process can be adopted for pressure triggering.

[0152] According to the pressure triggering requirements of different plastic welding workpieces, select different spring module groups; select the pressure triggering value through the touch screen; under the drive of the power source, the coupling shaft 307 presses down the spring module group, and the spring module group generates a downward pressing distance, driving the telescopic rod on the micro displacement sensor to move, and outputting different electrical signals through the internal potentiometer to be transmitted to the MCU control system to trigger the ultrasonic generator to emit ultrasound.

[0153] In this preferred embodiment, the number of compression springs can be quickly increased or decreased through the mechanical adjustment mechanism, providing different ranges of triggering pressures for different plastic workpieces, and meeting the welding requirements of different plastic workpieces without adjusting the machine model. It can not only improve the plastic welding efficiency and the qualified rate of welded parts, but also reduce the customer's use and maintenance costs.

[0154] Through the above embodiments, a trigger pressure regulating mechanism, a trigger pressure regulating method and a device are provided. Through this technical solution, by using a micro displacement sensor and a spring module, when the driving welding head presses down and contacts the surface of the plastic welding workpiece, the spring module starts to be compressed and deformed, and the compression amount of the compression spring is the displacement amount of the micro displacement sensor. When the set trigger pressure is reached, the transducer emits ultrasonic waves. By using a high-precision micro displacement sensor to collect displacement signals, the trigger pressure of welding can be accurately controlled, effectively improving the yield rate of plastic welding workpieces. It should be noted that these technical effects are not possessed by all of the above embodiments, and some technical effects can only be achieved by certain preferred embodiments.

[0155] The above are only the preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A trigger pressure regulating device is located in an ultrasonic welding machine, characterized in that, The trigger pressure regulating device includes: a base; a first elastic mechanism disposed on the base; a second elastic mechanism disposed on the base; a regulating member that controls the first elastic mechanism to operate and outputs a first range trigger pressure value corresponding to the first pressure trigger range when the input of the ultrasonic welding machine is within the first pressure trigger range; and controls the first elastic mechanism and the second elastic mechanism to operate simultaneously and outputs a second range trigger pressure value corresponding to the second pressure trigger range when the input is within the second pressure trigger range, where the second range trigger pressure value is greater than the first range pressure trigger value; a displacement sensor that detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or, the displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism operate simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

2. The trigger pressure regulating device according to claim 1, wherein The regulating member includes: a spring base disposed on the base, with one end of the first elastic mechanism disposed on the spring base and one end of the second elastic mechanism disposed on the spring base; a spring pressing plate provided with a first number of blind holes and a second number of through holes, with the other end of the first elastic mechanism installed in the first number of blind holes and the other end of the second elastic mechanism installed in the second number of through holes; a regulating plate connected to the spring pressing plate through an adjusting knob and provided with the second number of holes for installing the second number of cylindrical pins, and a part of the larger-radius end of each of the second number of cylindrical pins is inserted into the through holes of the spring pressing plate.

3. The trigger pressure regulating device according to claim 2, wherein The adjusting knob is connected to the regulating plate and controls the regulating plate to move up and down under the action of the spring force.

4. The trigger pressure regulating device according to claim 3, wherein when the input of the ultrasonic welding machine is within the first pressure trigger range, the adjusting knob controls the regulating plate to move upward to a first preset position, where the first preset position is such that the distance between the lower end of the second number of cylindrical pins and the upper end of the second elastic mechanism reaches a preset value.

5. The trigger pressure regulating device according to claim 3, wherein when the input of the ultrasonic welding machine is within the second pressure trigger range, the adjusting knob controls the regulating plate to move downward to a second preset position, and the second preset position includes: the lower surface of the regulating plate contacts the upper surface of the spring pressing plate.

6. The trigger pressure regulating device according to claim 2, characterized in that It further includes: a displacement sensor pressing piece disposed on the spring pressing plate and moving up and down with the spring pressing plate; wherein when the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal.

7. The trigger pressure regulating device according to any one of claims 1 to 6, characterized in that, The first elastic mechanism includes 8 springs; the second elastic mechanism includes 12 springs.

8. An ultrasonic welding machine, characterized in that, It includes: The trigger pressure regulating device according to any one of claims 1 to 7.

9. A trigger pressure regulation method, characterized in that, It includes: The ultrasonic welding machine receives the input pressure trigger range, where the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range; wherein, the ultrasonic welding machine includes: a base; a first elastic mechanism disposed on the base; a second elastic mechanism disposed on the base; an adjusting member, when the input of the ultrasonic welding machine is the first pressure trigger range, controlling the first elastic mechanism to work and outputting a first range trigger pressure value corresponding to the first pressure trigger range; when the input is the second pressure trigger range, controlling the first elastic mechanism and the second elastic mechanism to work simultaneously and outputting a second range trigger pressure value corresponding to the second pressure trigger range, and the second range pressure trigger range value is greater than the first range pressure trigger range value; The ultrasonic welding machine selects the first elastic mechanism to work through the adjusting member according to the input pressure trigger range; or, selects the first elastic mechanism and the second elastic mechanism to work simultaneously; wherein, the trigger pressure adjustment method further includes: The displacement sensor on the ultrasonic welding machine detects the compression displacement of the elastic force of the first elastic mechanism, generates a first displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the first range trigger pressure value; or, The displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

10. The trigger pressure adjustment method according to claim 9, wherein, The adjusting member includes: A spring base disposed on the base, and one end of the first elastic mechanism is disposed on the spring base, and one end of the second elastic mechanism is disposed on the spring base; A spring pressing plate provided with a first number of blind holes and a second number of through holes, the other end of the first elastic mechanism is installed in the first number of blind holes, and the other end of the second elastic mechanism is installed in the second number of through holes; and An adjusting plate connected to the spring pressing plate through an adjusting knob, and provided with the second number of holes for installing the second number of cylindrical pins, and a part of the larger radius end of each of the second number of cylindrical pins is inserted into the through holes of the spring pressing plate; The ultrasonic welding machine further includes a displacement sensor pressing piece disposed on the spring pressing plate and moving up and down with the spring pressing plate; The trigger pressure adjustment method further includes: When the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor, generates a displacement signal and sends it to the microprogram controller, The microprogram controller triggers the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves.

11. A trigger pressure regulating device is applied to an ultrasonic welding machine, characterized in that, The trigger pressure adjustment device includes: A base; A receiver for receiving the input pressure trigger range, where the pressure trigger range includes: a first pressure trigger range and a second pressure trigger range; A first elastic mechanism disposed on the base; The second elastic mechanism is arranged on the base; The adjusting member is configured to select the first elastic mechanism to work according to the input pressure trigger range; or, select the first elastic mechanism and the second elastic mechanism to work simultaneously; wherein, when the input pressure trigger range is the first pressure trigger range, control the first elastic mechanism to work and output the first range trigger pressure value corresponding to the first pressure trigger range; when the input pressure trigger range is the second pressure trigger range, control the second elastic mechanism to work and output the second range trigger pressure value corresponding to the second pressure trigger range, and the second pressure trigger range value is greater than the first pressure trigger range value; The displacement sensor is configured to detect the compression displacement of the elastic force of the first elastic mechanism, generate a first displacement signal, trigger the pressure of the ultrasonic welding machine, and output the first range trigger pressure value; or, the displacement sensor detects the compression displacement of the elastic force when the first elastic mechanism and the second elastic mechanism work simultaneously, generates a second displacement signal, triggers the pressure of the ultrasonic welding machine, and outputs the second range trigger pressure value.

12. The trigger pressure adjusting device according to claim 11, wherein The adjusting member includes: A spring base is arranged on the base, one end of the first elastic mechanism is arranged on the spring base, and one end of the second elastic mechanism is arranged on the spring base; A spring pressing plate is provided with a first number of blind holes and a second number of through holes. The other end of the first elastic mechanism is installed in the first number of blind holes, and the other end of the second elastic mechanism is installed in the second number of through holes; and An adjusting plate is connected to the spring pressing plate through an adjusting knob, and is provided with the second number of holes for installing the second number of cylindrical pins, and a part of the larger radius end of each of the second number of cylindrical pins is inserted into the through holes of the spring pressing plate; The trigger pressure adjusting device further includes a displacement sensor pressing piece arranged on the spring pressing plate and moving up and down with the spring pressing plate; When the displacement sensor pressing piece moves with the spring pressing plate, it drives the telescopic rod on the displacement sensor to generate a displacement signal and send it to the microprogram controller; The microprogram controller is configured to trigger the ultrasonic generator on the ultrasonic welding machine to emit ultrasonic waves according to the displacement signal.

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