Dispensing machine and dispensing method for cap sealing, cleaning method

Abstract

This invention relates to a dispensing machine, specifically a dispensing machine for sealing glue caps, and dispensing and cleaning methods. It addresses the shortcomings of existing contact dispensing methods, which suffer from low precision in glue volume and dispensing position, leading to inaccurate control of the dispensing effect and failing to meet the requirements of products with high dispensing precision. The dispensing machine includes a spray valve, a displacement unit, a power unit, and a control unit. The displacement unit controls the movement of the spray valve, which includes a valve body, a striking pin assembly, a nozzle, a flow channel assembly, and a heating base. The striking pin assembly includes a striking pin, a compression spring, and a piezoelectric module. The bottom end of the striking pin corresponds to the nozzle, and the top end is connected to the piezoelectric module, which controls the movement of the striking pin. The heating module heats the glue, which enters the nozzle through the flow channel assembly. The piezoelectric module drives the striking pin to move up and down to achieve glue dispensing. This invention also provides a dispensing method and a cleaning method based on this dispensing machine, achieving efficient operation.

Description

Technical Field

[0001] This invention relates to a dispensing machine, and more specifically to a dispensing machine and dispensing method and cleaning method for sealing glue caps. Background Technology

[0002] Existing dispensing machines are typically contact dispensing machines. During the dispensing process, the machine needs to directly contact the object to be dispensed. The dispensing speed cannot be too fast, and the glue is prone to stringing during contact, resulting in irregular glue dots that affect the shape and quality of the dispensed glue. Glue residue is also prone to appearing at the dispensing nozzle, requiring cleaning after a period of operation, which severely impacts work efficiency. Furthermore, the glue nozzle needs to move up and down along the z-axis for each dispensing operation, leading to low dispensing efficiency. When there are height deviations on the object to be dispensed, the positional accuracy of the dispensing is also difficult to control. Therefore, contact dispensing has low glue volume and positional accuracy, resulting in inaccurate dispensing results and failing to meet the requirements of products with high dispensing precision. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing contact dispensing methods, such as low precision in dispensing amount and position, which leads to inaccurate control of dispensing effect and inability to meet the needs of products requiring high dispensing precision. This invention provides a dispensing machine, dispensing method, and cleaning method for sealing caps.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0005] A dispensing machine for sealing glue caps is characterized by comprising at least one glue spraying valve, a displacement unit, a power unit, and a control unit. The displacement unit controls the movement of the glue spraying valve. The glue spraying valve includes a valve body, a striker assembly and a piezoelectric module disposed within the valve body, a nozzle corresponding to the striker assembly, a flow channel assembly connecting the nozzle, and a heating seat. The flow channel assembly includes a valve seat disposed on the valve body, with a through hole. One end of the through hole is connected to the outlet of the valve body, and the other end is connected to one end of the nozzle. A fluid channel is disposed inside the valve seat, with one end of the fluid channel communicating with the nozzle and the other end communicating with the glue. The power unit is used to deliver the glue to the fluid channel. The heating seat is located below the valve seat and surrounds the nozzle, including a heating module for heating the nozzle and fluid channel. The impact pin assembly includes an impact pin and a compression spring. The bottom end of the impact pin corresponds to the nozzle and matches its inner end. The top end is connected to a piezoelectric module for controlling the impact pin's movement. The compression spring is sleeved on the impact pin near its top end for resetting the impact pin. The control unit includes a sensor and a control module. The sensor detects whether the object to be dispensed is in place. The control module connects to the piezoelectric module, power unit, heating module, and displacement unit to control their working state and controls the working state of the piezoelectric module and power unit based on the sensor's detection signal.

[0006] Furthermore, the firing pin assembly also includes a guide shaft with a through hole corresponding to the valve seat. The guide shaft, through hole, and nozzle are all coaxially arranged. The bottom end of the firing pin passes through the guide shaft and through hole in sequence, and a compression spring is located between the top end of the firing pin and the guide shaft.

[0007] Furthermore, there are two glue spray valves, which are respectively arranged in the front end of the displacement unit in the horizontal and vertical directions, and are used to apply glue to different surfaces of the object to be glued.

[0008] The sensors include a first fiber optic sensor and a second fiber optic sensor. The control module controls the working state of the piezoelectric modules of the longitudinally and laterally arranged glue spray valves based on the detection signals of the first fiber optic sensor and the second fiber optic sensor, respectively.

[0009] Furthermore, it also includes an adhesive application platform and guide rails set on both sides of the object to be coated. The adhesive application platform is used to clean the nozzle, and the guide rails are used to guide the object to be coated.

[0010] The connector at the other end of the fluid channel is a Luer connector or a hose lock nut connector.

[0011] An adjusting nut is provided at the outer end of the nozzle to adjust the flow rate of the nozzle;

[0012] The nozzle is provided with a guide ring at its inner end, which is connected to the through hole and is sealed with an O-ring.

[0013] The power unit is compressed gas;

[0014] The first fiber optic sensor is a through-beam sensor; the second fiber optic sensor is a reflective fiber optic sensor.

[0015] Meanwhile, the present invention also provides a dispensing method based on the above-mentioned dispensing machine for sealing glue caps, which is characterized by including the following steps:

[0016] Step 1, Preparation

[0017] Connect the fluid channel inlet of the glue spray valve to the glue tank, and connect the glue tank to the power unit; add glue to the glue tank and heat the glue tank, adjust the power unit, turn on the heating module, and initialize the moving unit;

[0018] Step 2, test the glue

[0019] The control displacement unit moves the glue spraying valve to the standby glue spraying position, adjusts the glue dispensing amount to meet the process requirements, and performs a glue dispensing test to ensure that the glue dots dispensed meet the requirements.

[0020] Step 3, test the dispensing location

[0021] The control displacement unit moves the glue spray valve to the working position, and the conveyor belt is set accordingly at the working position. The conveyor belt is started, and the object to be glued moves on the conveyor belt. The glue dispensing position is tested to see if it is in the target position. If there is a positional deviation, the opening time of the glue spray valve is adjusted. After the glue dispensing position meets the process requirements, the equipment enters the standby working state.

[0022] Step 4: Apply adhesive.

[0023] Furthermore, in step 1, the power unit is compressed gas; the number of adhesive spray valves is two, arranged horizontally and vertically respectively;

[0024] In step 2, the adjustment of the dispensing amount is specifically achieved by adjusting the compressed gas pressure, the piezoelectric module voltage, the piezoelectric module stroke, and / or the dispensing time.

[0025] Step 4 specifically involves:

[0026] When the conveyor belt is started, the first fiber optic sensor detects the object to be dispensed and sends a detection signal to the control module. When the object to be dispensed moves directly below the longitudinal glue dispensing valve, the sensor controls the action of the vertical glue dispensing valve to perform the dispensing.

[0027] After the second fiber optic sensor detects the object to be dispensed, it sends a detection signal to the control module. When the object to be dispensed moves directly in front of the horizontal glue dispensing valve, it controls the action of the horizontal glue dispensing valve's striking pin to perform glue dispensing.

[0028] 4.2. Repeat step 4.1 until all objects to be glued have been glued.

[0029] Meanwhile, the present invention also provides a cleaning method based on the above-mentioned dispensing machine for sealing glue caps, which is characterized by including the following steps:

[0030] S1. Collection of Remaining Glue

[0031] The glue is discharged from the glue tank, glue spray valve and its connecting pipes through the power unit;

[0032] S2. Glue pipe cleaning

[0033] Inject cleaning agent into the glue tank, and control the power unit to inject the cleaning agent from the glue tank into the glue spray valve and then discharge it.

[0034] Furthermore, step S1 specifically includes:

[0035] The number of glue spraying valves is two, which are arranged in the horizontal and vertical directions respectively; the two glue spraying valves are set to the normally open mode, and the glue from the glue tank, the glue spraying valves and their connecting pipes are discharged to the glue collection container through the power unit.

[0036] Furthermore, it also includes step S3, cleaning the glue spray valve:

[0037] S3.1. Disassemble the glue spray valve: Disassemble the nozzle, heating seat, flow channel assembly, impact pin assembly, and glue spray assembly in sequence;

[0038] S3.2. Cleaning: Place each disassembled part into a cleaning agent and clean it ultrasonically;

[0039] S3.3. After cleaning, install the adhesive spray valve for later use.

[0040] Further, in step S2, the cleaning agent is a 95-99 wt.% ethanol solution, acetone, thinner, or a degumming agent.

[0041] The beneficial effects of this invention are:

[0042] 1. This invention uses a first fiber optic sensor and a second fiber optic sensor to detect the objects to be glued on the conveyor belt. A set amount of glue is sprayed onto the target position by the cooperation of compressed gas and a glue spraying valve. Then, a piezoelectric module drives the ejector pin to drop and spray out round glue dots for dispensing. The use of a piezoelectric module can improve the dispensing speed and accurately measure the amount of glue, and can dispense 10,000 objects to be glued per hour.

[0043] 2. The glue spray valve of the present invention does not need to contact the object to be glued. It sprays the glue out by compressing gas pressure and the impact of the ejector pin on the nozzle, thus avoiding glue stringing at the nozzle.

[0044] 3. The amount of adhesive in this invention is controlled by opening and closing the impact pin, which enables precise control and higher accuracy of the adhesive amount, reaching two decimal places in milliseconds; by adjusting the diameter of the impact pin and the corresponding nozzle diameter, a larger amount of adhesive can be delivered.

[0045] 4. The displacement unit of this invention precisely adjusts the position of the glue spraying valve. The displacement unit is controlled by a servo motor and is accurate to three decimal places in millimeters, accurately controlling the glue dispensing position.

[0046] 5. This invention features two glue-dispensing valves in different directions, along with a first fiber optic sensor and a second fiber optic sensor, which control the glue-dispensing valves in different directions respectively. This avoids interference between the glue-dispensing valves and facilitates the adjustment of dispensing parameters in different directions and accurate positioning of the dispensing position, without causing mutual interference. The second fiber optic sensor is a reflective fiber optic sensor, which avoids interference with the position of the lateral glue-dispensing valve.

[0047] 6. The two glue spray valves in this invention dispense glue at different angles, which further enhances the anti-transfer capability of the glue cap seal, ensures product consistency, and thus effectively resists counterfeiting of high-end wines and other products. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the dispensing machine according to an embodiment of the present invention;

[0049] Figure 2 This is a partially enlarged structural diagram of the glue spray valve in an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the adhesive spray valve in an embodiment of the present invention;

[0051] Figure 4 This is an exploded view of the glue spraying valve in an embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the dispensing machine piping connection in an embodiment of the present invention.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1-Glue spraying valve, 11-Valve body, 12-Nozzle, 13-Guide ring, 14-Valve seat, 15-Connector, 16-Heating seat, 17-Actuating pin, 18-Compression spring, 19-Guide shaft, 110-Cooling gas outlet, 111-Cooling gas inlet, 112-Plug seal, 113-O-ring, 114-Adjusting nut, 115-Connector adapter block, 2-Displacement unit, 3-Control unit, 4-Glue bucket, 41-Solenoid valve, 42-Glue collection bucket, 5-Conveyor belt, 51-Object to be glued, 6-First track, 61-Second track. Detailed Implementation

[0055] The structure of the dispensing machine for sealing glue caps in this invention is as follows: Figure 1 As shown, the device mainly includes two glue spraying valves 1, a displacement unit 2, a power unit, and a control unit 3. The displacement unit 2 includes a servo motor and a corresponding four-degree-of-freedom mechanical structure. Both glue spraying valves 1 are connected to a six-degree-of-freedom mechanical structure. The displacement unit 2 is used to achieve precise control of the glue spraying position and can move freely in the Y-axis and Z-axis directions. Limit switches are provided on both the Y-axis and Z-axis to limit its operating range. In other embodiments of the invention, a six-degree-of-freedom mechanical structure can also be used to make the movement of the glue spraying valves 1 more flexible.

[0056] The structure of the glue spray valve 1 is as follows Figure 3 and Figure 4 As shown, the assembly includes a valve body 11, a striker assembly and a piezoelectric module disposed in the valve body 11, a glue spraying assembly corresponding to the striker assembly, a flow channel assembly connecting the nozzle 12, and a heating seat 16. The glue spraying assembly includes a nozzle 12, a guide ring 13 disposed at the inner end of the nozzle 12, and an adjusting nut 114 disposed at the outer end of the nozzle 12 for adjusting the flow rate of the nozzle 12. The outer end of the nozzle 12 corresponds to the object 51 to be glued on the external conveyor belt 5, and the guide ring 13 is coaxially disposed with the nozzle 12.

[0057] The flow channel assembly is located at the outlet of the valve body 11 and includes a valve seat 14 connected to the valve body 11. The valve seat 14 has a through hole. One end of the through hole is sealed to the outlet of the valve body 11, and the other end is connected to the guide ring 13. An O-ring 113 is provided between the guide ring 13 and the through hole for sealing. A fluid channel is provided inside the valve seat 14. One end of the fluid channel is connected to the nozzle 12, and the other end is connected to the glue through the connector 15. In this embodiment, the connector 15 is a Luer connector. The Luer connector is connected to the other end of the fluid channel through the connector adapter block 115. The power unit is compressed gas. The glue is delivered to the fluid channel by the compressed gas. A solenoid valve 41 is provided on the compressed gas pipeline. The amount of glue delivered is controlled by the solenoid valve 41.

[0058] The heating seat 16 is disposed below the valve seat 14 and surrounds the outer periphery of the nozzle 12, and a heating module is provided therein for heating the nozzle 12 and the glue in the fluid channel.

[0059] The striking pin assembly includes a striking pin 17, a compression spring 18, and a guide shaft 19 corresponding to the through hole of the valve seat 14. The guide shaft 19 is positioned corresponding to the through hole, and a plug seal 112 is provided between the guide shaft 19 and the through hole to achieve sealing. The striking pin 17, guide shaft 19, through hole, guide ring 13, and nozzle 12 are all coaxially arranged. The bottom end of the striking pin 17 passes through the guide shaft 19 and the through hole in sequence, corresponding to the nozzle 12, and the top end is connected to the piezoelectric module. The compression spring 18 is located at the top end of the striking pin 17 and the guide shaft. Between 19 and 12, the top end simultaneously limits the compression spring 18, allowing the compression spring 18 to reset the striker 17. In the non-working state, a space is left between the striker 17 and the guide ring 13 to facilitate glue flow. During operation, the piezoelectric module controls the striker 17 to move along the guide shaft 19, opening the nozzle 12 and allowing glue to flow through. After a set time, the piezoelectric module controls the striker 17 to move towards the nozzle 12, striking the nozzle 12 to spray out the glue. The piezoelectric module is a piezoelectric ceramic structure and can be an integral part of the valve body 11 or a separate structure.

[0060] The valve body 11 also has a cooling gas channel inside for heat dissipation of the piezoelectric module. It is connected to the cooling gas through the cooling gas inlet 111 and the cooling gas is recovered or discharged through the cooling gas outlet 110 to prevent the circuit temperature from becoming too high and overloaded during long-term operation. At the same time, it prevents the thermal expansion and contraction of the striker 17 and the valve body 11 from affecting the accuracy of the glue spraying valve 1.

[0061] In this embodiment, the two glue spraying valves 1 are respectively configured as horizontal and vertical, and are both located at the front end of the four-degree-of-freedom mechanical structure of the displacement unit 2, such as... Figure 2 As shown, it is used to apply glue to different surfaces of the object 51 to be glued. In this embodiment, glue is applied to the longitudinal surface and the transverse surface of the object 51 to be glued.

[0062] The control unit 3 includes a first fiber optic sensor, a second fiber optic sensor, and a PLC control system. The PLC control system is connected to the piezoelectric module, the solenoid valve 41 for compressed gas, the heating module, and the servo motor of the displacement unit 2, and controls their operating states. The first fiber optic sensor is a through-beam sensor, located on both sides of the object to be glued 51, used to detect whether the object to be glued 51 is in position, ensuring accurate positioning of the glue dispensing position. The first fiber optic sensor transmits the detection signal to the PLC control system, which then controls the operating states of the solenoid valve 41 and the piezoelectric module of the longitudinal glue dispensing valve 1 according to the detection signal, thereby controlling the operating state of the longitudinal glue dispensing valve 1. The second fiber optic sensor is a reflective fiber optic sensor used to control the operating state of the transverse glue dispensing valve 1. In this embodiment, all glue dispensing valves 1 are connected to a glue dispensing controller, and the PLC control system controls the operation of the piezoelectric module and the heating module through the glue dispensing controller.

[0063] The dispensing machine also includes a glue wiping platform. After the glue spraying valve 1 has been working for a period of time, the PLC controls its nozzle 12 to perform a glue wiping action on the glue wiping platform to clean the nozzle 12 and prevent glue from accumulating at the nozzle 12, which would affect the amount of glue dispensed.

[0064] The main parameters affecting dispensing include: compressed gas pressure, piezoelectric module voltage and stroke, and dispensing time. Dispensing time includes single dispensing time and total dispensing time. Single dispensing time is the time for one cycle of the ejector pin 17's movement, consisting of the opening time of the dispensing valve 1, the glue injection time, and the closing time of the dispensing valve 1. The opening time of the dispensing valve 1 is the time from when the first or second fiber optic sensor detects the object 51 to be dispensed until the ejector pin 17 opens. The closing time of the dispensing valve 1 is the time from when the PLC control system sends a signal to when the ejector pin 17 closes. The total dispensing time is the single dispensing time multiplied by the number of ejector pin movements. Different process parameters can be saved for different products and adhesives. The compressed gas pressure is adjusted via the solenoid valve 41; increasing the compressed gas pressure and the single dispensing time will increase the dispensing volume. The piezoelectric module voltage and stroke affect the glue output of the nozzle 12. The higher the voltage, the greater the pressure of the ejector pin on the nozzle, resulting in a larger glue output. Changes in stroke will affect the single dispensing time.

[0065] When dispensing glue using the dispensing machine of this invention, the fluid channels of the glue spraying valve 1 are all connected to the glue tank 4. The glue tank 4 is similar in shape to a syringe, including a straight section and a conical section located below the straight section. The top of the conical section faces downward, and a discharge port is provided on the top of the conical section to facilitate the complete discharge of the glue with high viscosity in the glue tank 4. A liquid phase inlet and a compressed gas inlet are provided on the top of the glue tank 4. A funnel is provided on the liquid phase inlet to facilitate the addition of glue or cleaning agent to the glue tank 4. The compressed gas inlet is connected to the compressed gas through a connecting pipe. A solenoid valve 41 is provided on the connecting pipe. A three-way valve is provided at the discharge port of the glue tank 4. Two of the three-way valves are respectively connected to the other end of the fluid channels of the two glue spraying valves 1. In this invention, the two glue spraying valves 1 are used as two independent workstations, working at different time intervals to avoid mutual interference. This is beneficial to the transmission and recovery of the pressure in the glue tank 4, reduces the fluctuation of the glue pressure in the glue tank 4, and ensures a stable and consistent glue spraying volume.

[0066] The dispensing method specifically includes the following steps:

[0067] Step 1, Preparation

[0068] 1.1. Initialize the two glue spray valves 1 and the controller.

[0069] Connect the power supply and initialize the glue spray valve 1 and the controller.

[0070] 1.2. Adding glue to glue container 4: Pour glue into glue container 4 until the liquid level indicator shows a level of 95%, so that compressed gas can enter.

[0071] 1.3. Pressurize the glue bucket 4

[0072] Adjust the compressed gas pressure connected to glue tank 4 to ≥0.2Mpa, open solenoid valve 41, and check for air and glue leaks in glue tank 4, connecting pipes, and two glue spraying valves 1.

[0073] 1.4. Turn on the heating function.

[0074] Turn on the heating controller of glue tank 4 and the heating modules of the two glue spray valves 1, and wait for the heating temperature to reach the set temperature. The set temperature of glue spray valve 1 is ≤60℃.

[0075] 1.5. Initialize displacement element 2

[0076] Initialize the parameters of displacement element 2.

[0077] Step 2, test the glue

[0078] The control displacement unit 2 moves the two glue spraying valves 1 to the standby glue spraying position, and places the glue collection bucket 42 in place with the corresponding nozzle 12 to perform a glue dispensing test: the glue dispensing amount is adjusted to meet the process requirements, and there are no problems such as glue residue, bubbles, or spraying.

[0079] Step 3, test the dispensing location

[0080] After the adhesive test is completed, the control displacement unit 2 moves the two glue spray valves 1 to the working position, which corresponds to the conveyor belt 5. The conveyor belt 5 is then started, and the object to be glued 51 is placed on the conveyor belt 5 and moved to test whether the glue dispensing position is in the target position. If there is a positional deviation, the opening time of the two glue spray valves 1 is adjusted respectively through the PLC control system. After the glue dispensing position meets the process requirements, the equipment enters the standby working state. A guide rail is set above the conveyor belt 5 to guide the object to be glued 51 and ensure its consistent position.

[0081] like Figure 1 As shown, in this embodiment, the object to be glued 51 is a bottle, and the glue dispensing machine dispenses glue onto its bottle cap. The guide rail includes a first track 6 and a second track 61. The first track 6 is located on both sides of the bottle body to guide the bottle body, and the second track 61 is located on both sides of the bottle mouth to guide the bottle mouth and improve the glue dispensing accuracy.

[0082] Step 4, apply adhesive.

[0083] 4.1. Start the conveyor belt 5. After the first fiber optic sensor detects the bottle, it sends the detection signal to the PLC control system. After an appropriate delay, when the center of the top of the bottle cap moves directly below the longitudinal glue spray valve 1, the striker 17 of the longitudinal glue spray valve 1 is activated to dispense glue. The delay time is set based on experience.

[0084] After the second fiber optic sensor detects the bottle, it sends the detection signal to the PLC control system. After an appropriate delay, the side of the bottle cap moves to the front of the horizontal glue spray valve 1, and the striker 17 of the horizontal glue spray valve 1 is controlled to perform glue dispensing. In this embodiment, linear glue dispensing is achieved by controlling the dispensing time of the horizontal glue spray valve 1.

[0085] 4.2. Repeat step 4.1 until all bottles are coated with adhesive.

[0086] After dispensing the adhesive, a glue cap is fitted onto the bottle cap. The glue dispensing positions the glue cap, ensuring that its position remains unchanged after heat shrinking, thus improving the anti-transfer effect of the glue cap. In other embodiments of the present invention, the number and angle of the glue spray valve 1 can be adjusted as needed, and there can be one or more. Multiple glue spray valves 1 operate independently and do not interfere with each other.

[0087] To prevent glue residue, the number of wiping cycles can be set in control unit 3. After the set number of cycles is reached, displacement unit 2 controls the two glue spraying valves 1 to move to the wiping platform to perform the wiping action. During short-term production line shutdowns, the dispensing machine can enter standby glue dispensing mode to ensure glue flowability and quickly resume production. In standby glue dispensing mode, the equipment moves to the standby glue spraying position and cyclically sprays glue according to the set time intervals.

[0088] After dispensing is complete, the dispensing machine is cleaned; no piping adjustments are required. Figure 5 As shown, the cleaning process is carried out through the following steps:

[0089] S1. Collection of Remaining Glue

[0090] Adjust the two glue spray valves 1 to the normally open mode, and set the glue collection tank 42 corresponding to the nozzle 12. The glue from the glue tank 4, connecting pipe and fluid channel is sprayed out along the nozzle 12 to the glue collection tank 42 by compressed gas.

[0091] S2. Glue pipe cleaning

[0092] Inject cleaning agent into glue tank 4, and control the compressed gas to propel the cleaning agent from the discharge port of glue tank 4 through the connecting pipe and fluid channel, out of nozzle 12 to the cleaning agent recovery tank. The cleaning agent can be a strong organic solvent such as acetone, thinner, glue remover, or alcohol solution.

[0093] S3. Cleaning of glue spray valve 1

[0094] S3.1. Disassemble glue spray valve 1: Disassemble the nozzle 12, heating seat 16, flow channel assembly, impact pin assembly, connector 15, and glue spray assembly of the two glue spray valves 1 in sequence;

[0095] S3.2. Cleaning: Place each disassembled part into an ultrasonic cleaner containing 95-99 wt.% alcohol and clean for 10 minutes. If there is too much adhesive in the nozzle 12 and fluid channel, other cleaning agents can be used for soaking and cleaning.

[0096] S3.3. After cleaning, install the glue spray valve 1 for later use.

Claims

1. A dispensing machine for sealing glue caps, characterized in that: It includes at least one glue spraying valve (1), a displacement unit (2), a power unit and a control unit (3), wherein the displacement unit (2) is used to control the movement of the glue spraying valve (1); The glue spraying valve (1) includes a valve body (11), a striker assembly and a piezoelectric module disposed in the valve body (11), a nozzle (12) disposed corresponding to the striker assembly, a flow channel assembly connected to the nozzle (12), and a heating seat (16). There are two glue spray valves (1), which are respectively arranged in the front end of the displacement unit (2) in the horizontal and vertical directions, and are used to apply glue to different surfaces of the object (51) to be glued. The sensor includes a first fiber optic sensor and a second fiber optic sensor. The control module controls the working state of the piezoelectric module of the longitudinally and laterally set glue spray valve (1) according to the detection signals of the first fiber optic sensor and the second fiber optic sensor, respectively. The flow channel assembly includes a valve seat (14) disposed on a valve body (11). A through hole is provided on the valve seat (14). One end of the through hole is connected to the outlet of the valve body (11), and the other end is connected to one end of the nozzle (12). A fluid channel is provided inside the valve seat (14). One end of the fluid channel is connected to the nozzle (12), and the other end of the fluid channel is connected to the glue. The power unit is used to deliver the adhesive to the fluid channel; The heating seat (16) is located below the valve seat (14) and surrounds the outer periphery of the nozzle (12), including a heating module for heating the nozzle (12) and the fluid channel; The impact pin assembly includes an impact pin (17), a compression spring (18), and a guide shaft (19) with a through hole corresponding to the valve seat (14). The bottom end of the impact pin (17) is set with the nozzle (12) and matches its inner end. The top end is connected to a piezoelectric module, which is used to control the action of the impact pin (17). The compression spring (18) is sleeved on the impact pin (17) near the top end and is used to reset the impact pin (17). The guide shaft (19), the through hole, and the nozzle (12) are all coaxially set. The bottom end of the impact pin (17) passes through the guide shaft (19) and the through hole in sequence. The compression spring (18) is located between the top end of the impact pin (17) and the guide shaft (19). The control unit (3) includes a sensor and a control module. The sensor is used to detect whether the object to be glued (51) is in place. The control module is connected to the piezoelectric module, the power unit, the heating module and the displacement unit (2) to control its working state and control the working state of the piezoelectric module and the power unit according to the detection signal of the sensor.

2. The dispensing machine for sealing glue caps according to claim 1, characterized in that: It also includes a glue-wiping platform and guide rails set on both sides of the object to be glued. The glue-wiping platform is used to clean the nozzle (12), and the guide rails are used to guide the object to be glued (51). The connector (15) at the other end of the fluid channel is a Luer connector or a hose locking nut connector; An adjusting nut (114) is provided at the outer end of the nozzle (12) for adjusting the flow rate of the nozzle (12); The inner end of the nozzle (12) is provided with a guide ring (13), which is connected to the through hole and is sealed with an O-ring (113). The power unit is compressed gas; The first fiber optic sensor is a through-beam sensor; the second fiber optic sensor is a reflective fiber optic sensor.

3. A dispensing method, based on the dispensing machine for sealing glue caps as described in claim 1, characterized in that, Includes the following steps: Step 1, Preparation Connect the fluid channel inlet of the glue spray valve (1) to the glue tank (4), connect the glue tank (4) to the power unit; add glue to the glue tank (4) and heat the glue tank (4), adjust the power unit, turn on the heating module, and initialize the moving unit; Step 2, test the glue The control displacement unit (2) moves the glue spraying valve (1) to the standby glue spraying position, adjusts the glue dispensing amount to meet the process requirements, performs a glue dispensing test, and makes the glue dots dispensed meet the requirements. Step 3, test the dispensing location The control displacement unit (2) moves the glue spray valve (1) to the working position. The working position is set with the corresponding conveyor belt (5). The conveyor belt (5) is started. The object to be glued (51) moves on the conveyor belt (5). The glue dispensing position is tested to see if it is in the target position. If there is a position deviation, the opening time of the glue spray valve (1) is adjusted. After the glue dispensing position meets the process requirements, the equipment enters the standby working state. Step 4, apply adhesive, specifically as follows: 4.

1. Start the conveyor belt (5). After the first fiber optic sensor detects the object to be dispensed (51), it sends the detection signal to the control module. When the object to be dispensed (51) moves directly below the longitudinal glue spray valve (1), the impact pin (17) of the longitudinal glue spray valve (1) is controlled to perform glue dispensing. After the second fiber optic sensor detects the object to be dispensed (51), it sends the detection signal to the control module. When the object to be dispensed (51) moves to the front of the horizontal glue spray valve (1), it controls the action of the impact pin (17) of the horizontal glue spray valve (1) to dispense glue. 4.

2. Repeat step 4.1 until all objects to be glued (51) have been glued.

4. The dispensing method according to claim 3, characterized in that: In step 1, the power unit is compressed gas; In step 2, the adjustment of the dispensing amount is specifically achieved by adjusting the compressed gas pressure, the piezoelectric module voltage, the piezoelectric module stroke, and / or the dispensing time.

5. A cleaning method, based on the dispensing machine for sealing glue caps as described in claim 1, characterized in that, Includes the following steps: S1. Collection of Remaining Glue The glue canister (4), glue spray valve (1) and its connecting pipes are discharged through the power unit; S2. Glue pipe cleaning Inject cleaning agent into glue tank (4), and control the power unit to inject the cleaning agent from glue tank (4) into the glue spray valve (1) and then discharge it.

6. The cleaning method according to claim 5, characterized in that, Step S1 is as follows: Set the two glue spray valves (1) to normally open mode, and discharge the glue from the glue bucket (4), glue spray valve (1) and its connecting pipes to the glue collection container through the power unit.

7. The cleaning method according to claim 5 or 6, characterized in that, It also includes step S3, cleaning of the glue spray valve (1): S3.

1. Disassemble the glue spray valve (1): Disassemble the nozzle (12), heating seat (16), flow channel assembly, impact pin (17) assembly, and glue spray assembly in sequence; S3.

2. Cleaning: Place each disassembled part into a cleaning agent and clean it ultrasonically; S3.

3. After cleaning, install the glue spray valve (1) for later use.

8. The cleaning method according to claim 7, characterized in that: In step S2, the cleaning agent is a 95-99 wt.% ethanol solution, acetone, thinner, or a degumming agent.

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