Low phase noise quartz crystal oscillator and full-automatic detection and packaging equipment thereof

Abstract

The application discloses a low phase noise quartz crystal oscillator and a full-automatic detection and packaging equipment thereof. The oscillator comprises a phase discriminator, a loop filter and a voltage-controlled crystal oscillator, the output phase of the voltage-controlled crystal oscillator is locked through the phase discrimination loop, and stable clock output with low noise and high precision is realized. The detection and packaging equipment is provided with vibration feeding, material distribution testing, visual detection, crystal transfer and heat sealing stations on the same platform, automatic roll changing of the carrier tape is realized through double-reel automatic winding, a pre-receiving mechanism is arranged for the upper sealing film to avoid blockage, automatic sealing is realized through the air-suction chuck supplying sealing adhesive tape, and automatic cutting and loading of the carrier tape are realized, the actions of the stations are coordinated, the full-automatic detection and packaging process of the oscillator crystal from feeding to packaging is realized, and the efficiency is greatly improved. The application innovates the structure of the oscillator, realizes low phase noise and high precision output, innovates the detection and packaging equipment to solve the pain points in the automatic process, and realizes revolutionary upgrading of the oscillator detection and packaging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quartz crystal oscillator, in particular to a quartz crystal oscillator with low phase noise realized by using crystal oscillator and phase discriminator loop, and a detection and packaging equipment for realizing the full-process automation of the quartz crystal oscillator. BACKGROUND

[0002] In some industrial process control, phase noise sensitive equipment, and high-precision timing and synchronization system required fields, such as radar system, GPS time synchronization, base station timing, etc., these occasions require extremely high timing accuracy and environmental change resistance, so a crystal oscillator with extremely low phase noise must be used. The frequency of the crystal oscillator and the voltage-controlled crystal oscillator can be adjusted by compensation circuit and voltage application, respectively, to adapt to environmental changes. Based on the above application requirements, a new type of quartz crystal oscillator with low phase noise is developed, which can effectively solve the demand for ultra-high precision and stability in this field.

[0003] On the other hand, the detection procedure of complex devices such as crystal oscillator, voltage-controlled crystal oscillator and phase noise quartz crystal oscillator is more complex and time-consuming than that of general crystal oscillator. At present, the mainstream detection equipment is integrated with finished product packaging, such as the multi-station quartz crystal oscillator integrated test, classification, marking and packaging equipment disclosed in the authorized announcement No. CN107499563B. The equipment integrates feeding mechanism, main and auxiliary turntable mechanism, material picking and classifying mechanism, material overturning mechanism, material marking mechanism and material packaging mechanism, realizes the integrated operation of the test, classification, marking and packaging process of the quartz crystal oscillator, and greatly improves the production efficiency.

[0004] However, after completing the packaging of a tray of tape, manual disc changing is still required to continue the production of the next tray. Manual disc changing requires stoppage operation, which has great risk to the detection equipment with complex and precise detection program. First, the stoppage interrupts the working state of the detection equipment, which causes some detection modules to need to be recalibrated when the equipment is restarted, reducing the detection efficiency. Second, the timeliness of manual operation in changing the new tray after stoppage is prone to delay, causing the stoppage time to be too long and increasing energy consumption. Finally, relying on manual disc changing cannot realize continuous unattended all-day automatic operation, limiting the further improvement of production capacity. Therefore, this technical solution relying on manual disc changing has obvious defects in system completeness and reliability. Developing a fully automatic quartz crystal oscillator detection and packaging equipment to realize automatic disc changing and feeding is considered an important way to realize high-efficiency continuous production. SUMMARY

[0005] The present application provides a fully automatic quartz crystal oscillator detection and packaging equipment, which realizes the full-process automation of automatic detection and packaging of the quartz crystal oscillator.

[0006] The application aims to realize the following technical solutions: a full-automatic quartz crystal oscillator detection packaging equipment, comprising a platform for installing various components; an industrial computer, a vibrating disc feeding device, a material distribution and testing device, a CCD visual discrimination device, and a crystal moving and orienting device fixed on the platform; a carrier tape feeding device fixed below the platform; a carrier tape guiding device fixed on the platform and along the carrier tape running route; a power device for driving the carrier tape; the equipment further comprises:

[0007] A double-reel winding device for automatically winding and changing the carrier tape;

[0008] An upper sealing film pre-winding mechanism, a sealing material feeding device, and a cutting mechanism arranged between the double-reel winding device and the carrier tape guiding device;

[0009] The upper sealing film pre-winding mechanism is used to pre-wind the remaining upper sealing film after heat sealing is completed;

[0010] The sealing material feeding device is used to paste the sealing material to the end of the upper sealing film after the upper sealing film is cut off;

[0011] The cutting mechanism is used to cut off the carrier tape, the upper sealing film, and the sealing material;

[0012] The double-reel winding device, the upper sealing film pre-winding mechanism, the sealing material feeding device, and the cutting mechanism work together to realize the automatic heat sealing packaging, pre-winding of the upper sealing film, pasting of the sealing material, cutting of the carrier tape, and automatic changing of the double reels, thereby realizing full-automatic continuous detection packaging.

[0013] As a preferred embodiment, the double-reel winding device comprises: a frame body for overall support; a rotating seat rotatably installed on the frame body; a reel mounting plate abutting or parallel to the large face of the rotating seat and slidable relative to the rotating seat; limiting pulleys arranged on both sides of the length direction of the reel mounting plate and in contact with the reel mounting plate to limit the sliding position of the reel mounting plate; a long hole arranged in the middle of the reel mounting plate and having an angle with the length direction of the mounting plate; and a pressing piece arranged in the long hole, in contact with the side wall of the long hole, and designed to change the pressing point and the center distance. The sliding design of the reel mounting plate makes the position of the reel adjustable, which is beneficial to finding the reel hole position when cutting the carrier tape and improves the degree of automation.

[0014] As preferred, the upper sealing film pre-rolling mechanism comprises: a vertical transmission assembly for vertical transmission; a sliding seat walking along the transmission path of the vertical transmission assembly; an execution base body located on one side of the working surface of the sliding seat; a push cylinder with the piston rod free end fixedly connected with the execution base body; and a roller fixedly installed on the execution base body; the sliding seat moves in the vertical direction and the push cylinder moves in the horizontal direction, driving the roller to complete the rolling and holding of the upper sealing film. Advantage: the upper sealing film pre-rolling mechanism can collect the upper sealing film in advance, avoid hindering the subsequent action, and ensure smooth operation.

[0015] As preferred, the sealing material feeding device comprises: a fixed seat for fixation; a movable seat hingedly connected with the fixed seat and capable of loading and unloading an adhesive tape reel; a power part in transmission connection with the movable seat; and a pushing assembly for fixing the starting end of the adhesive tape and unfolding the length of the adhesive tape; the pushing assembly comprises: a plate body fixedly connected with the movable seat; a rolling rod with one end fixedly connected with the movable seat and the other end extending towards the width direction of the adhesive tape; a pushing air cylinder fixedly connected with the plate body; a suction disc seat installed on the piston rod free end of the pushing air cylinder; and a suction disc arranged towards the back surface of the adhesive tape; when the movable seat moves, the suction disc sucks the adhesive tape by negative pressure, so that the adhesive surface of the adhesive tape faces outward, and the rotation of the reel is completed to realize the pasting of the adhesive tape and the upper sealing film. Advantage: the sealing material feeding device can reliably unfold and paste the sealing adhesive tape by the negative pressure suction disc, realizing automatic sealing.

[0016] As preferred, an outer pressing wheel is further arranged at the work station of the double-reel rolling device, for pressing the carrier tape in the rolling process of the reel. Advantage: the arrangement of the outer pressing wheel can compact the carrier tape and reduce the rebound, improving the rolling quality.

[0017] As preferred, a tensioning mechanism and a pressing wheel are further arranged between the power device and the double-reel rolling device, for temporarily clamping or tensioning the carrier tape in the conveying process. Advantage: the arrangement of the tensioning mechanism and the pressing wheel can fix or apply tension to the carrier tape when needed, facilitating the dismounting and changing of the reel.

[0018] As preferred, the rotating seat of the double-reel rolling device is driven by a first motor, the pressing member is driven by a second motor, and the two reels are respectively driven by a third motor and a fourth motor. The sliding seat of the upper sealing film pre-rolling mechanism is driven by a first motor, and the push cylinder is driven by a second motor. The movable seat of the sealing material feeding device is driven by a first motor, and the pushing air cylinder is driven by a second motor. Advantage: the motor driving of each execution mechanism is more flexible and controllable.

[0019] As preferred, the rolling rod is made of non-stick material. Advantage: the rolling rod is made of non-stick material, avoiding the adhesion of the adhesive tape and affecting the feeding.

[0020] The application also provides a low phase noise quartz crystal oscillator, comprising:

[0021] Crystal oscillator, for providing high-precision and low-noise reference clock signal;

[0022] Phase detector, a first input end of which is connected to the output end of the crystal oscillator, for detecting phase change of the input signal;

[0023] Loop filter, an output end of which is connected to the output end of the phase detector, for providing certain loop bandwidth;

[0024] Voltage-controlled crystal oscillator, an input end of which is connected to the output end of the loop filter, for adjusting frequency and phase of the output signal according to the detection result of the phase detector;

[0025] Wherein, a second input end of the phase detector is connected to the output end of the voltage-controlled crystal oscillator, and the phase relationship between the two input ends is compared, and the output control signal of the phase detector modulates the output of the voltage-controlled crystal oscillator through the loop filter, so that the frequency and phase of the output signal are locked on the phase of the crystal oscillator, thereby obtaining a clock signal output with high precision, low phase noise and high stability.

[0026] In summary, compared with the prior art, the present application has the following advantages:

[0027] 1. The full automation and continuous operation of the quartz crystal oscillator detection packaging are realized, and the efficiency is greatly improved.

[0028] 2. The double-reel automatic reel changing design solves the low efficiency problem of traditional manual reel changing, and the entire detection packaging process is realized automatically without manual intervention.

[0029] 3. The reel sliding design enables the broken end of the carrier tape to be automatically found in the empty reel hole during the reel changing process, ensuring smooth docking and preventing the carrier tape from breaking or the process from being interrupted.

[0030] 4. The upper film sealing pre-rolling mechanism avoids hindering the subsequent process, the sealing tape feeding device realizes automatic sealing, and the mechanism actions are coordinated to ensure smooth process.

[0031] 5. Various auxiliary designs, such as external pressure wheels, tensioning mechanisms, non-stick material rollers, and air jet suction cups, improve the reliability of automatic operation and product quality.

[0032] 6. Motor driving and control are adopted to make the actions of each execution mechanism more flexible and controllable, and different process schemes can be adapted.

[0033] 7. The device realizes the automation upgrade of the quartz crystal oscillator detection packaging, not only improves the efficiency, but also reduces the production cost, which is of great significance to the capacity expansion.

[0034] 8. The low phase noise and high stability oscillator that locks the output of the voltage-controlled crystal oscillator through the phase-locked loop can provide a higher precision clock reference signal.

[0035] 9. This patent incorporates innovations in multiple aspects, including mechanical structure, control method, and device application. The overall effect is to achieve a revolutionary upgrade in the automatic testing and packaging process of quartz crystal oscillators, as well as an improvement in related product indicators.

[0036] 10. This solution can be extended to more crystal resonator testing and packaging scenarios, expanding product types and helping companies expand the production capacity of quartz crystal oscillators. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a finished crystal oscillator reel (the adhesive seal is open).

[0038] Figure 2 This is a schematic diagram of the packaging equipment.

[0039] Figure 3 This is a structural schematic diagram of the packaging device from another angle and at a partial location.

[0040] Figure 4 This is a structural schematic diagram of the packaging device from another angle and at a partial location.

[0041] Figure 5 This is a structural schematic diagram of the packaging equipment from another angle;

[0042] Figure 6 This is a schematic diagram of the upper sealing film pre-shrinking mechanism;

[0043] Figure 7 This is a structural schematic diagram of the packaging device from another angle and at a partial location.

[0044] Figure 8 for Figure 7 A magnified view of a portion of point a.

[0045] Figure 9 This is the front view of the packaging device.

[0046] Marked in the figure: platform 1, rack 11, carrier tape supply device 2, carrier tape guide device 3, upper sealing film supply device 4, carrier tape heat sealing mechanism 5, power device 6 driving the carrier tape, reel 01, carrier tape 02, upper sealing film 03, sealing material 04, adhesive tape reel 05, double-reel winding device 70, upper sealing film pre-winding mechanism 80, sealing material supply device 90, cutting mechanism 100, frame body 71, rotating seat 72, reel mounting plate 73, limiting pulley 731, long hole 732, pressing piece 733, first motor 734, second motor 735, third motor 736, third motor 737, transmission assembly 81, sliding seat 82, execution base body 83, pushing cylinder 84, roller 85, fixed seat 91, movable seat 92, pushing assembly 93, plate body 931, rolling rod 932, pushing cylinder 933, suction cup seat 934, suction cup 935, blocking strip 936, outer pressing wheel 200, tensioning mechanism 300, pressing wheel 400, guide slot plate 500. DETAILED DESCRIPTION

[0047] The following is a description of one example of a preferred embodiment of the present application. Please note that the following embodiment is used as an example only, and the present application is not limited by the following embodiment.

[0048] Furthermore, in the drawings referred to in the embodiments, components having the same function will be referred to using the same reference numerals. Meanwhile, the drawings are for illustrative purposes only, and thus the size ratio of the objects depicted therein can be different from the size ratio of actual objects. The size ratio between different objects in the drawings can also be different. The specific object size ratio should be determined according to the following description. The positional movement on the X-axis, Y-axis and Z-axis mentioned in the embodiments can be realized by setting a cross slide or a mechanical arm, unless otherwise specified.

[0049] Example 1

[0050] Referring to all drawings

[0051] Firstly, the technical solution proposes a low phase noise quartz crystal oscillator, which is used to realize high-precision and high-stability clock signal output. It is composed of four key components: crystal oscillator, phase detector, filter and voltage-controlled crystal oscillator.

[0052] The crystal oscillator selects Abracon ABT-134-20.000MHz type crystal oscillator. One end of R7 is connected to the stabilized power supply, and the other end is connected to the ground through the stabilizing capacitor C16. The fifth and tenth pins of the crystal oscillator are directly connected to the ground, and the sixth pin is connected to the phase detector through the coupling capacitor C8 to provide an accurate phase comparison reference for the phase detector. This type of crystal oscillator adopts an optimized crystal cutting direction design, which greatly improves the frequency accuracy.

[0053] The phase detector is selected with advanced automatic frequency control technology, which can detect the small phase change of the input signal. The output of the crystal oscillator is input as the reference phase signal at the REFin end, and the output of the voltage-controlled crystal oscillator is input as the phase signal to be measured at the RFinA end. Through the internal digital phase detection circuit, the real-time phase relationship of the two signals is compared, and according to the set algorithm, the corresponding control voltage representing the phase difference is output. The phase detector also integrates programmable loop bandwidth setting function, which facilitates the optimization of loop filter parameters.

[0054] The loop filter adopts a simple RC filter circuit composed of resistor R1 and capacitors C9 and C10, which can provide a loop bandwidth of about 1 kHz, effectively suppress noise interference, and improve the stability of loop control. The filter has small size, high cost performance, and is easy to debug. Higher order or algorithm adaptive digital filter scheme can also be selected according to needs.

[0055] The voltage-controlled crystal oscillator selects ASPFS7L type MEMS voltage-controlled crystal oscillator with small size and low phase noise. It uses silicon micro-mechanical system technology to modulate the mechanical vibration frequency of the crystal by applying a control voltage, realizing the modulation of the output frequency. The phase noise of this voltage-controlled crystal oscillator is better than that of ordinary crystal resonator, which can meet the needs of high-precision phase-locked loop. The control end Vtune is modulated by the output voltage of the loop filter, so that the output frequency is locked on the crystal phase, thereby obtaining a low-noise and stable high-precision clock output.

[0056] This technical scheme does not require a large constant temperature system, has low cost, and the phase noise is less than -20 dBc / Hz@10 kHz. The entire circuit design adopts SMT technology, and the component height is not more than 6 mm, which is very suitable for small-sized electronic products. Subsequently, by selecting a digital signal processor and a temperature sensor, digital intelligent temperature control can be realized, further improving the frequency accuracy and temperature adaptation range, and providing a reliable, economical and practical solution for high-end clock sources.

[0057] This scheme can also be extended and optimized in design:

[0058] 1. Higher frequency crystal oscillators such as 50 MHz and 100 MHz can be selected to expand the frequency selection range.

[0059] 2. Optimize the phase detector parameters, customize the loop bandwidth, gain, etc., to improve the control flexibility.

[0060] 3. Upgrade to a wide temperature compensation scheme, cooperate with digital constant temperature, and expand the working temperature range.

[0061] 4. Add a self-checking and calibration module to correct control bias in real time and improve long-term frequency stability.

[0062] 5. Adopting low noise amplifier, can reduce phase noise, meet higher precision demand.

[0063] 6. Integrated design with digital signal processor, realize intelligent digital control, optimize cost performance.

[0064] 7. Using special ASIC chip instead of standard phase detector, can customize key parameters, improve performance.

[0065] 8. MEMS process and CMOS integrated manufacturing, can realize smaller size and mass production.

[0066] 9. System in package and test, can improve product reliability and consistency.

[0067] 10. Different application can customize output frequency and performance index, meet different demand.

[0068] Second, the technical scheme also proposes a kind of full-automatic quartz crystal oscillator detection and packaging equipment, refer to Figure 2 For the convenience of explanation and understanding, the coordinate system is defined as follows: the Z axis represents the direction of gravity, the X and Y axes define the two directions of the horizontal plane, and the three axes are orthogonal.In the following description, the direction parallel to the Y axis is also referred to as the "depth direction Y", and the direction parallel to the Z axis is referred to as the "plumb direction Z".

[0069] The equipment includes:

[0070] 1) a platform 1 for component mounting;

[0071] 2) a rack 11 supporting the platform 1;

[0072] 3) detection and processing units such as industrial computer, vibration disc feeding device, material distribution testing device, CCD vision discrimination device, crystal transfer orientation device, etc., fixed on the platform 1, which have no direct connection with the improvement, and are not described here;

[0073] 4) a carrier tape feeding device 2 fixed below the platform 1;

[0074] 5) a carrier tape guide device 3 fixed on the platform 1 and laid along the carrier tape running route;

[0075] 6) an upper film feeding device 4 and a carrier tape heat sealing mechanism 5 erected above the carrier tape guide device 3;

[0076] 7) a power device 6 for driving the carrier tape;

[0077] 8) a carrier tape winding device for winding the carrier tape, which is linearly arranged with the carrier tape guide device 3, not shown in the figure.

[0078] The feeding of the upper sealing film feeding device 4 is synchronized with the movement after the heat sealing of the carrier tape and the belt; the power device 6 matches the speed of the distribution test device.

[0079] The key structural improvements are focused on the carrier tape conveying and winding mechanism. Figure 1 The completed winding carrier tape reel is shown, including the carrier tape reel 01, the carrier tape 02, the upper sealing film 03, and the sealing material 04. The sealing material can be one of the paper tape and the masking tape. For easy observation, the tape is not pasted. In the actual process, after winding to the set count, about 30-40 cm of blank carrier tape is left, and the upper sealing film is left for 60-100 cm to wind the reel 1.5 times, and finally pasted with the sealing material. The number of packaged products is commonly 1000-3000 pieces per reel. Taking the commonly used ordinary SMD crystal oscillator with a count of 2000 pieces as an example, a reel is usually completed in 30 minutes. However, after the device is full, manual disc changing is required, which not only consumes time but also easily introduces human errors.

[0080] On this basis, the improvements are as follows:

[0081] The original carrier tape winding device is replaced with a double reel winding device 70 to realize automatic reel changing, and an upper sealing film pre-winding mechanism 80, a sealing material feeding device 90, and a cutting mechanism 100 are arranged between the winding device and the guide device.

[0082] The upper sealing film pre-winding mechanism 80 can arbitrarily set the lifting position of its execution part within the reachable range.

[0083] The cutting mechanism 100 can arbitrarily reach the required positions of its execution part on the X-axis, Y-axis, and Z-axis.

[0084] The sealing material feeding device 90 can make its execution part drag the sealing material to contact and adhere to the upper sealing film.

[0085] These newly added devices and mechanisms cooperate with the original conveying power device, heat sealing mechanism, and other modules to realize fully automatic packaging and winding.

[0086] The specific structure of the double reel winding device 70 is referred to Figure 5 , including:

[0087] 1) The frame 71 is used to provide support for the entire device;

[0088] 2) The rotating seat 72 is rotatably mounted on the frame 71;

[0089] 3) The reel mounting plate 73 is in contact with the large face of the rotating seat or parallel to it, and can slide relative to the rotating seat. Its length is designed to accommodate two reels, and the centers of the two reel faces are in the same plane, which is also the center line of the tape width direction;

[0090] 4) Multiple limiting pulleys 731 are arranged on both sides of the reel mounting plate in the length direction, and are in contact with the reel mounting plate to limit its sliding position;

[0091] 5) Long hole 732 is arranged in the middle of the reel mounting plate, and its direction is at an angle to the length direction of the mounting plate;

[0092] 6) The pressing piece 733 is arranged in the long hole and in contact with the side wall of the long hole. It is designed to change the pressing point and the center distance, so that when it rotates at different positions, the overall position of the reel mounting plate can be adjusted.

[0093] The power part is preferably motor-driven, including a first motor 734 for driving the rotating seat 72 to rotate, a second motor 735 for driving the pressing piece 733 to rotate, and a third motor 736 and a third motor 737 for driving one of the two reels to wind, respectively. The transmission and control mode of these motors is not limited.

[0094] The slidable design of the reel mounting plate 73 considers two aspects:

[0095] First, when the adhesive tape is pasted in step seven, the sliding changes the distance and angle with the adhesive tape feeding device, so that it can be more flexible to realize reliable pasting;

[0096] Second, when the tape is butted in step eight, the sliding and rotating of the rotating seat 72 and the reel cooperate to make the tape return to the hole position above after the tape is misaligned, so as to realize correct joint.

[0097] Referring to Figure 6 , the specific structure of the upper film pre-collection mechanism 80 includes:

[0098] 1) The transmission assembly 81 is vertically arranged and fixed on the frame body 71;

[0099] 2) The sliding seat 82 moves along the transmission path of the transmission assembly 81;

[0100] 3) The execution base body 83 is located on the working side of the sliding seat 82;

[0101] 4) The push cylinder 84 is fixed on the sliding seat 82, and the free end of the piston rod is fixedly connected with the execution base body 83;

[0102] 5) The roller 85 is fixedly installed on the execution base body 83;

[0103] 6) The direction of motion of the push cylinder 84 is along the depth direction of the actuator 83.

[0104] The power source for the slide 82 is not shown in the figure. It moves the slide 82 in the height direction to adjust the alignment of the roller 85 with the upper sealing film in the height direction. The push cylinder 84 moves the roller 85 in the depth direction to adjust its positional alignment with the upper sealing film. With the coordinated operation of these two power sources, the pre-tensioning and release of the upper sealing film are completed, thereby ensuring continuous operation of the equipment.

[0105] Reference Figure 5 The specific structure of the sealing material feeding device 90 includes:

[0106] 1) Fixing base 91, fixed on frame 71;

[0107] 2) The movable seat 92 is hinged to the fixed seat 91 and can be detachably connected to the tape reel 05. During the rotation of the movable seat 92, the position of the tape reel 05 is higher than the position when the carrier tape is normally wound.

[0108] 3) The power unit (not shown in the figure) is connected to the movable seat 92 via a transmission.

[0109] 4) Pushing component 93, used to fix the starting end of the tape and extend forward to unfold the tape length. Pushing component 93 (refer to...) Figures 7-8 )include:

[0110] ① The plate 931 is fixed at one end to the movable seat 92, and the other end extends in the direction of the tape width;

[0111] ② The roller 932 is fixed at one end to the movable seat 92, and the other end extends in the direction of the tape width and exceeds the tape width. It is made of non-stick material.

[0112] ③ Push cylinder 933 is fixed on plate 931;

[0113] ④ Suction cup seat 934, installed at the free end of the piston rod of the push cylinder;

[0114] ⑤ At least one suction cup 935, with the suction nozzle facing downwards toward the back of the tape;

[0115] 5) The baffle 936 is set on the rolling rod, made of non-stick material, and has a nozzle inside, which can blow the tape to the suction cup for pickup.

[0116] When using new tape for the first time, you need to manually pull out the starting end of the tape, so that it goes around the roller and reaches below the suction cup (e.g. Figure 8(As shown). During operation, the suction cup uses negative pressure to hold the tape, ensuring the adhesive side faces outwards, facilitating bonding between the movable seat and the upper sealing tape as it moves. The purpose of the push cylinder is to more flexibly push and bond the tape.

[0117] To facilitate the suction cup's adhesion of the tape, a baffle 936 with a nozzle is installed on the adhesive side of the tape. This baffle is made of a non-stick material and is mounted on the roller rod, with the nozzle's air passage located inside the baffle. After each application, the tape falls onto the baffle, bringing the suction cup closer to the tape and improving adhesion. Simultaneously, the airflow from the nozzle blows the tape towards the suction cup, further increasing the success rate of adhesion.

[0118] An outer pressure roller 200 is provided at the winding station of the reel. During winding, the outer pressure roller 200 is held at the outermost circumference of the carrier tape by power. The power can be obtained by setting springs or cylinders or other methods, which are not shown in the figure. The purpose of this setting is to prevent the carrier tape from springing back during winding. At the same time, it is also used to press the adhesive position firmly after the tape is applied.

[0119] A tensioning mechanism 300 is provided between the power unit 6 that drives the carrier belt and the dual-reel winding device 70. Below the tensioning mechanism 300 is a pressure roller 400 that can be moved away from or closer to the carrier belt. The power source of the pressure roller can be a cylinder (not shown in the figure). The pressure roller is used for temporary fixation or to increase friction by clamping. For example, in step four of the equipment's workflow, the carrier belt is fixed so as to separate it from the upper sealing film. Or, for example, in step seven, the upper sealing film is kept under tension after being cut, which helps with winding and tape adhesion.

[0120] Reference Figure 9 To make it easier for the cut-off carrier tape to enter the newly replaced empty reel hole, a guide groove plate 500 is fixed on the side of the frame 71.

[0121] Specific workflow:

[0122] Step 1: The qualified crystals that have passed the test are placed into the carrier tape by the crystal transfer and orientation device;

[0123] Step 2: The power unit 6 driving the carrier tape, one of the reels of the dual-reel winding device 70, and the carrier tape heat sealing mechanism 5 operate synchronously, simultaneously conveying, heat-sealing, and winding the carrier tape containing the crystal;

[0124] Step 3: After the set quantity of heat-pressed packaging is reached, leave an empty space of about 30 cm for the carrier tape. When this empty space of carrier tape is transferred between the reel and the carrier tape guide device 3, the reel stops moving.

[0125] Step 4: The power unit 6 driving the carrier belt continues to transmit power (therefore, the carrier belt will exhibit...). Figure 3As shown, the upper sealing film is separated from the lower sealing film, and the space between the two provides space for the upper sealing film pre-shrinking mechanism 80 to enter.

[0126] Step 5: The actuator of the upper sealing film pre-retraction mechanism 80 quickly lifts the upper sealing film upwards to pre-retract a length sufficient to wrap around the carrier tape reel 1.5 times. The lifted state is as follows. Figure 2 As shown;

[0127] Step 6: The cutting mechanism 100 cuts the carrier tape, the reel quickly winds up, the upper sealing film pre-winding mechanism 80 decreases in speed in coordination with the reel winding until all the pre-wound upper sealing film is wound up, the upper sealing film pre-winding mechanism 80 moves away from the upper sealing film, and the cutting mechanism 100 cuts the upper sealing film.

[0128] Step 7: The actuating part of the sealing material feeding device 90 adheres the sealing material to the cut end of the upper sealing film. The sealing material feeding device 90 unfolds a certain length of tape by swinging, and the reel continues to rewind until the tape and the upper sealing film are pasted to the required length to meet the sealing requirements.

[0129] At the same time, the truncated carrier tape gradually lengthens during transmission;

[0130] Step 8: The cutting mechanism 100 cuts the sealing material, and the execution part of the sealing material feeding device 90 is reset; the double reel winding device 70 rotates as a whole, and the sealed reel moves away from the winding position so that it can be replaced with a new empty reel by means of other means such as a robotic arm with a suction cup, while the other empty reel approaches the end of the cut carrier tape (all known reels have at least one hole for receiving the end of the carrier tape). By setting a sensor and cooperating with the rotation of the reel, the end of the carrier tape enters the hole, and the reel is started to rotate to start a new winding operation. The double reel winding device 70 rotates as a whole so that the reel that entered the winding operation comes to the normal winding position.

[0131] This dual-reel design solves the problem of traditional single-reel designs requiring machine downtime for reel replacement, and achieves automated packaging and rewinding processes, significantly improving automation levels and work efficiency, enabling true continuous production.

Claims

1. A fully automatic quartz crystal oscillator testing and packaging equipment, comprising a platform for mounting various components; an industrial control computer, a vibratory feeder, a material distribution and testing device, a CCD vision discrimination device, and a crystal transfer and orientation device fixed on the platform; a carrier tape feeding device fixed below the platform; a carrier tape guiding device fixed on the platform and laid along the carrier tape travel path; and a power device for driving the carrier tape; characterized in that... Also includes: A dual-reel winding device is used to automatically complete the winding and changing of carrier tape; The upper sealing film pre-winding mechanism, the sealing material feeding device, and the cutting mechanism are arranged between the dual-reel winding device and the carrier belt guiding device; The upper sealing film pre-winding mechanism is used to pre-wind the remaining upper sealing film after heat sealing; The sealing material feeding device is used to attach sealing material to the end of the upper sealing film after the upper sealing film is cut; The cutting mechanism is used to cut the carrier tape, upper sealing film, and sealing material; The coordinated operation of the dual-reel winding device, the upper sealing film pre-winding mechanism, the sealing material feeding device, and the cutting mechanism enables automatic heat sealing of the carrier tape, pre-winding of the upper sealing film, application of sealing material for sealing, and carrier tape cutting, as well as automatic reel changing, thereby achieving fully automatic continuous inspection and packaging. The dual-reel winding device includes: a frame for overall support; a rotatable base mounted on the frame; a reel mounting plate that is abutting or parallel to the large surface of the rotatable base and can slide relative to the rotatable base; limiting pulleys disposed on both sides of the reel mounting plate along its length and in contact with the reel mounting plate to limit its sliding position; an elongated hole disposed in the middle of the reel mounting plate at a certain angle to the length direction of the mounting plate; and a pressure member disposed in the elongated hole, in contact with the side wall of the elongated hole, and designed with a variable diameter to change the pressure point and center distance.

2. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 1, characterized in that... The upper sealing film pre-receiving mechanism includes: a vertical transmission assembly for vertical transmission; a slide that travels along the transmission path of the vertical transmission assembly; an execution base located on one side of the working surface of the slide; a push cylinder whose main body is fixed on the slide and whose free end of the piston rod is fixedly connected to the execution base; and rollers fixedly installed on the execution base; the slide moves in the vertical direction and the push cylinder moves in the horizontal direction, driving the rollers to complete the winding, unwinding and holding of the upper sealing film.

3. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 1, characterized in that... The sealing material feeding device includes: a fixed base for fixing; a movable base hinged to the fixed base and capable of detaching the tape reel; a power unit connected to the movable base in a transmission manner; and a pushing assembly for fixing the starting end of the tape and extending the tape length forward. The pushing assembly includes: a plate fixed on the movable base; a rolling rod with one end fixed to the movable base and the other end extending in the width direction of the tape; a pushing cylinder fixed on the plate; a suction cup seat installed at the free end of the piston rod of the pushing cylinder; and a suction cup facing the back of the tape. When the movable base moves, the suction cup uses negative pressure to hold the tape, so that the adhesive side of the tape faces outward, and the tape is bonded to the upper sealing film in conjunction with the rotation of the reel.

4. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 1, characterized in that... It also includes an external pressure roller installed at the station of the dual-reel winding device, used to press the carrier tape during the reel winding process.

5. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 1, characterized in that... It also includes a tensioning mechanism and a pressure roller disposed between the power unit and the dual-reel winding device, for temporary clamping or tensioning during the conveyor belt transport process.

6. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 1, characterized in that... The rotating base of the dual-reel winding device is driven by a first motor, the pressing member is driven by a second motor, and the two reels are driven by a third and a fourth motor, respectively.

7. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 2, characterized in that... The slide of the upper sealing film pre-shrinking mechanism is driven by a first motor, and the push cylinder is driven by a second motor.

8. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 3, characterized in that... The movable seat of the sealing material feeding device is driven by a first motor, and the pushing cylinder is driven by a second motor.

9. The fully automated quartz crystal oscillator testing and packaging equipment according to claim 3, characterized in that... The roller is made of non-stick material.

10. A low-phase-noise quartz crystal oscillator, tested and packaged by the fully automated quartz crystal oscillator testing and packaging equipment described in claim 1, characterized in that, include: A crystal oscillator is used to provide a high-precision and low-noise reference clock signal. A phase detector, whose first input terminal is connected to the output terminal of the crystal oscillator, is used to detect phase changes of the input signal; A loop filter, connected to the output of the phase detector, is used to provide a certain loop bandwidth; A voltage-controlled crystal oscillator, whose input is connected to the output of the loop filter, is used to adjust the frequency and phase of the output signal according to the detection result of the phase detector. The second input terminal of the phase detector is connected to the output terminal of the voltage-controlled crystal oscillator and compares the phase relationship between the two input terminals. Its output control signal is modulated by the loop filter to make the frequency and phase of the output signal lock on the phase of the crystal oscillator, thereby obtaining a clock signal output with high frequency accuracy, low phase noise and high stability.

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