Dispensing machine for packaging rubber caps, dispensing method and cleaning method

Abstract

The invention relates to a dispensing machine, in particular to a dispensing machine for packaging a glue cap, a dispensing method and a cleaning method, and overcomes the defects that the dispensing effect cannot be accurately controlled and the requirements of products with high dispensing requirement precision cannot be met due to the fact that the glue amount and the dispensing position precision of existing contact type dispensing are not high. The dispensing machine comprises a glue spraying valve, a displacement unit, a power unit and a control unit, the displacement unit is used for controlling the glue spraying valve to move, and the glue spraying valve comprises a valve body, a firing pin assembly, a nozzle, a runner assembly and a heating base. The striker assembly comprises a striker, a compression spring and a piezoelectric module, the bottom end of the striker corresponds to the nozzle, the top end of the striker is connected with the piezoelectric module, and the piezoelectric module is used for controlling the striker to act. The heating module is used for heating glue, the glue enters the nozzle through the flow channel assembly, the piezoelectric module drives the firing pin to move up and down to achieve glue spraying, the invention further provides a glue dispensing method and a cleaning method based on the glue dispenser, and efficient work is achieved.

Description

Technical Field

[0001] The invention relates to a glue dispensing machine, in particular to a glue dispensing machine used for glue cap packaging, a glue dispensing method and a cleaning method. Background Art

[0002] Existing dispensing machines are usually contact dispensing. During the dispensing process, they need to be in direct contact with the object to be dispensed. The speed of contact dispensing cannot be too fast. During the contact process, the glue is easy to be drawn, and the shape of the resulting glue dots is irregular, affecting the shape and quality of the dispensed glue. The glue outlet of the dispensing machine is prone to glue hanging, and it needs to stop working and clean after running for a period of time, which seriously affects work efficiency. At the same time, each time the glue is dispensed, the glue nozzle of the dispensing machine needs to move up and down along the z-axis, and the dispensing efficiency is too low. When there is a height deviation of the object to be dispensed, the dispensing position accuracy is also difficult to control. Therefore, the glue amount and dispensing position accuracy of the contact dispensing are not high, resulting in the inability to accurately control the dispensing effect, and it cannot meet the needs of products that require high precision in dispensing. Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcomings of the existing contact dispensing, such as the low glue amount and the low glue dispensing position accuracy, which leads to the inability to accurately control the glue dispensing effect and the inability to meet the needs of products requiring high glue dispensing precision. A glue dispensing machine, a glue dispensing method and a cleaning method for glue cap packaging are provided.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A glue dispensing machine for glue cap packaging, which is special in that it includes at least one glue spray valve, a displacement unit, a power unit and a control unit, the displacement unit is used to control the movement of the glue spray valve; the glue spray valve includes a valve body, a striker assembly and a piezoelectric module arranged in the valve body, a nozzle arranged corresponding to the striker assembly, a flow channel assembly connected to the nozzle and a heating seat; the flow channel assembly includes a valve seat arranged on the valve body, a through hole is opened on the valve seat, 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 arranged inside the valve seat, one end of the fluid channel is connected to the nozzle, and the other end of the fluid channel is connected to the glue; the power unit is used to transport the glue to the fluid channel; the The heating seat is arranged below the valve seat and surrounds the outer circumference of the nozzle, including a heating module for heating the nozzle and the fluid channel; the striker assembly includes a striker and a compression spring, the bottom end of the striker corresponds to the nozzle setting and matches its inner end, and the top end is connected to the piezoelectric module, which is used to control the striker movement; the compression spring is sleeved on the striker near the top end for resetting the striker; the control unit includes a sensor and a control module, the sensor is used to detect whether the object to be dispensed is in place, the control module is connected to the piezoelectric module, the power unit, the heating module and the displacement unit, and is used to control their working status, and control the working status of the piezoelectric module and the power unit according to the detection signal of the sensor.

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

[0007] Furthermore, there are two glue spray valves, which are respectively arranged at the front end of the displacement unit in the horizontal direction and the vertical direction, and are used to realize glue dispensing on different surfaces of the object to be glued;

[0008] The sensors include a first optical fiber sensor and a second optical fiber sensor. The control module controls the working states of the piezoelectric modules of the longitudinally and transversely arranged glue spraying valves according to the detection signals of the first optical fiber sensor and the second optical fiber sensor respectively.

[0009] Furthermore, it also includes a glue wiping platform and guide rails arranged on both sides of the object to be glued, the glue wiping platform is used to clean the nozzle, and the guide rails are used to guide the object to be glued;

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

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

[0012] A guide ring is provided at the inner end of the nozzle, the guide ring is correspondingly connected to the through hole, and an O-ring is provided for sealing;

[0013] The power unit is compressed gas;

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

[0015] At the same time, the present invention also provides a dispensing method, which is based on the above-mentioned dispensing machine for glue cap packaging, and its special feature is that it includes the following steps:

[0016] Step 1. Preparation

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

[0018] Step 2: Test the glue

[0019] Control the displacement unit to move the glue spray valve to the standby glue spraying position, adjust the glue dispensing amount to meet the process requirements, and perform glue dispensing tests to ensure that the glue dots meet the requirements;

[0020] Step 3: Test the dispensing position

[0021] Control the displacement unit to move the glue spray valve to the working position. The working position corresponds to the conveyor belt. Start the conveyor belt and move the object to be glued on the conveyor belt to test whether the glue dispensing position is at the target position. If there is a position deviation, adjust the opening time of the glue spray valve. When the glue dispensing position meets the process requirements, the equipment enters the standby working state.

[0022] Step 4: Dispense glue.

[0023] Furthermore, in step 1, the power unit is compressed gas; the number of the glue spraying valves is two, which are respectively arranged in the horizontal direction and the vertical direction;

[0024] In step 2, the dispensing amount is adjusted by adjusting the compressed gas pressure, the piezoelectric module voltage, the piezoelectric module stroke and / or the dispensing time;

[0025] Step 4 is as follows:

[0026] The conveyor belt is started, and after the first optical fiber sensor detects the object to be dispensed, a detection signal is sent to the control module. When the object to be dispensed moves just below the longitudinal glue spray valve, the longitudinal glue spray valve's striker is controlled to perform glue dispensing.

[0027] After the second optical fiber sensor detects the object to be dispensed, it sends a detection signal to the control module. When the object to be dispensed moves just in front of the horizontal glue spray valve, the striker of the horizontal glue spray valve is controlled to perform glue dispensing.

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

[0029] At the same time, the present invention also provides a cleaning method based on the above-mentioned dispensing machine for glue cap packaging, which is special in that it includes the following steps:

[0030] S1. Remaining glue collection

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

[0032] S2. Glue pipeline cleaning

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

[0034] Furthermore, step S1 is specifically as follows:

[0035] There are two glue spray valves, which are arranged in the horizontal and vertical directions respectively; the two glue spray valves are set to the normally open mode, and the glue in the glue barrel, the glue spray valve and the connecting pipeline is discharged into the glue collection container through the power unit.

[0036] Furthermore, the method further includes step S3, cleaning the glue spray valve:

[0037] S3.1. Disassemble the spray valve: disassemble the nozzle, heater block, flow channel assembly, tappet assembly, and spray assembly in sequence;

[0038] S3.2. Cleaning: Ultrasonic cleaning of disassembled parts in a cleaning agent;

[0039] S3.3. After cleaning, install the glue spray valve for standby use.

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

[0041] Beneficial effects of the present invention:

[0042] 1. The present invention uses a first fiber optic sensor and a second fiber optic sensor to detect the objects to be glued moving on the conveyor belt, and uses compressed gas and a glue spray valve to spray a set amount of glue at the target position. The piezoelectric module then drives the striker to fall and spray out round glue dots for glue dispensing. The use of a piezoelectric module can increase the glue dispensing speed and can accurately quantify, and can achieve glue dispensing of 10,000 objects to be glued per hour.

[0043] 2. The glue spraying valve of the present invention does not need to contact the object to be glued. The glue is sprayed out by the compressed gas pressure and the impact of the striker on the nozzle, which prevents the glue from drawing at the nozzle.

[0044] 3. The glue amount of the present invention is controlled by opening and closing the striker, which can achieve fine control and higher precision of glue amount, which can reach two decimal places in milliseconds; by adjusting the striker diameter and the corresponding nozzle diameter, a larger amount of glue can be delivered.

[0045] 4. The displacement unit of the present invention can accurately adjust 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, so the glue dispensing position can be accurately controlled.

[0046] 5. The present invention provides two glue spraying valves in different directions, and also provides a first fiber optic sensor and a second fiber optic sensor to control the glue spraying valves in different directions respectively, thereby avoiding interference between the glue spraying valves and facilitating the adjustment of glue dispensing parameters in different directions and accurate positioning of glue dispensing positions without causing mutual interference. The second fiber optic sensor adopts a reflective fiber optic sensor to avoid interference with the horizontal glue spraying valve position.

[0047] 6. The two glue spray valves provided in the present invention dispense glue at different angles, further improving the anti-transfer capability of the glue cap package, ensuring product consistency, and thus effectively resisting the counterfeiting of high-end wines and other products. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0049] Figure 2 1 is a partial enlarged structural diagram of a glue spray valve in an embodiment of the present invention;

[0050] Figure 3 2 is a schematic structural diagram of a glue spray valve according to an embodiment of the present invention;

[0051] Figure 4 is an exploded view of a glue spray valve according to an embodiment of the present invention;

[0052] Figure 5 Schematic diagram of the pipe connection of the glue dispensing machine in an embodiment of the present invention.

[0053] Description of reference numerals:

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

[0055] The structure of the glue dispensing machine for glue cap packaging of the present invention is as follows Figure 1 As shown, the system mainly includes two glue spray 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 spray 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. The Y-axis and Z-axis are both equipped with limit switches to limit their operating range. In other embodiments of the present invention, a six-degree-of-freedom mechanical structure can also be used to make the movement of the glue spray valve 1 more flexible.

[0056] The structure of the glue spray valve 1 is as follows Figure 3 and Figure 4 As shown, it includes a valve body 11, a striker assembly and a piezoelectric module arranged in the valve body 11, a glue spraying assembly arranged corresponding to the striker assembly, a flow channel assembly connected to the nozzle 12, and a heating seat 16; the glue spraying assembly includes a nozzle 12, a guide ring 13 arranged at the inner end of the nozzle 12, and an adjusting nut 114 arranged at the outer end of the nozzle 12, which is used to adjust the flow rate of the nozzle 12; the outer end of the nozzle 12 corresponds to the object to be dispensed 51 on the external conveyor belt 5, and the guide ring 13 is coaxially arranged 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. A through hole is opened on the valve seat 14, one end of the through hole is sealed with the outlet of the valve body 11, and the other end is connected to the guide ring 13. An O-ring 113 is arranged between the guide ring 13 and the through hole for sealing. A fluid channel is arranged 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, which is connected to the other end of the fluid channel through the connector adapter block 115. The power unit is compressed gas, and the glue is transported to the fluid channel by compressed gas. An electromagnetic valve 41 is arranged on the compressed gas pipeline, and the amount of glue delivered is controlled by the electromagnetic valve 41.

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

[0059] The striker assembly includes a striker 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 arranged corresponding to the through hole, and a pan seal 112 is arranged between the guide shaft 19 and the through hole to achieve sealing. The striker 17, the guide shaft 19, the through hole, the guide ring 13 and the nozzle 12 are all coaxially arranged. The bottom end of the striker 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 of the striker 17 and the guide shaft. 19, the top end simultaneously limits the compression spring 18, allowing the compression spring 18 to reset the striker 17; in the non-operating state, there is space between the striker 17 and the guide ring 13 to facilitate the flow of glue. When working, the piezoelectric module controls the striker 17 to move along the guide shaft 19, opening the nozzle 12 to allow the glue to flow through. After the set time is reached, the piezoelectric module controls the striker 17 to move in the direction of the nozzle 12, and the glue is sprayed out by the striker 17 hitting the nozzle 12. The piezoelectric module is a piezoelectric ceramic structure and can be an integral structure with the valve body 11 or a separate structure.

[0060] The valve body 11 is also provided with a cooling gas flow channel for dissipating heat from the piezoelectric module. The cooling gas is connected to the cooling gas inlet 111 and is recovered or discharged through the cooling gas outlet 110. This prevents the circuit from overheating and overloading during long-term operation. It also prevents the thermal expansion and contraction of the striker 17 and the valve body 11 from affecting the accuracy of the glue spray valve 1.

[0061] In this embodiment, the two glue spraying valves 1 are respectively arranged in the horizontal direction and the vertical direction, and are both arranged 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 implement glue dispensing on different surfaces of the object to be glued 51. In this embodiment, glue is dispensed on the longitudinal surface and the transverse surface of the object to be glued 51 respectively.

[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 compressed gas solenoid valve 41, 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, disposed on both sides of the object 51 to be glued, and is used to detect whether the object 51 to be glued is in place, 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 spray valve 1 based on the detection signal, thereby controlling the operating state of the longitudinal glue spray valve 1. The second fiber optic sensor is a reflective fiber optic sensor, which is used to control the operating state of the transverse glue spray valve 1. In this embodiment, the glue spray valves 1 are all connected to the glue spray controller, and the PLC control system controls the operation of the piezoelectric module and the heating module through the glue spray controller.

[0063] The glue 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 go to the glue wiping platform to perform the glue wiping action and clean the nozzle 12 to avoid glue accumulation at the nozzle 12 and affect the glue dispensing amount.

[0064] Parameters affecting dispensing include compressed gas pressure, piezoelectric module voltage and stroke, and dispensing time. Dispensing time includes both single dispensing time and total dispensing time. Single dispensing time is the time it takes for the striker 17 to complete a cycle, and is composed of the opening time of the spray valve 1, the glue feeding time, and the closing time of the spray valve 1. The opening time of the spray valve 1 is the time between the first or second fiber optic sensor detecting the object 51 to be dispensed and the opening of the striker 17. The closing time of the spray valve 1 is the time it takes for the PLC control system to send a signal to the striker 17 to close. The total dispensing time is the single dispensing time multiplied by the number of times the striker moves. Different process parameters can be maintained for different products and glues. The compressed gas pressure is adjusted by the solenoid valve 41. Increasing the compressed gas pressure and 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 on the nozzle by the striker, resulting in a greater amount of glue sprayed. Changes in stroke affect the single dispensing time.

[0065] When using the glue dispensing machine of the present invention for dispensing glue, the fluid channels of the glue spray valve 1 are connected to the glue barrel 4. The glue barrel 4 is similar in shape to a syringe, including a straight section and a tapered section arranged below the straight section. The top of the tapered section faces downward, and a discharge port is provided on the top of the tapered section to facilitate complete discharge of the glue with higher viscosity in the glue barrel 4. A liquid phase inlet and a compressed gas inlet are provided above the glue barrel 4. A funnel is provided on the liquid phase inlet to facilitate adding glue or cleaning agent to the glue barrel 4. The compressed gas inlet is connected to the compressed gas through a connecting pipe. An electromagnetic valve 41 is provided on the connecting pipe. A three-way valve is provided at the discharge port of the glue barrel 4. Two of the three-way valves are respectively connected to the other end of the fluid channels of the two glue spray valves 1. In the present invention, the two glue spray valves 1 are respectively used as two independent workstations, working at different time intervals to avoid mutual influence, which is beneficial to the conduction and recovery of the pressure of the glue barrel 4, reducing the fluctuation of the glue pressure in the glue barrel 4, and ensuring the stability and consistency of the glue spraying amount.

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

[0067] Step 1. Preparation

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

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

[0070] 1.2. Add glue to glue barrel 4: Pour glue into glue barrel 4 until the liquid level indicator shows 95% to facilitate the entry of compressed gas.

[0071] 1.3. Pressurize the glue barrel 4

[0072] Adjust the compressed gas pressure connected to the glue barrel 4 to ≥ 0.2Mpa, open the solenoid valve 41, and check whether there are any air leaks or glue leaks in the glue barrel 4, the connecting pipes, and the two glue spray valves 1.

[0073] 1.4. Turn on the heating function

[0074] Turn on the heating controller of the glue barrel 4 and the heating modules of the two glue spraying valves 1, and wait until the heating temperature reaches the set temperature. The set temperature of the glue spraying valve 1 is ≤60°C.

[0075] 1.5. Initialize displacement unit 2

[0076] Initialize displacement unit 2 parameters.

[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, places the glue collection bucket 42 corresponding to the nozzle 12, and performs glue dispensing test: adjust the glue dispensing amount to meet the process requirements, and there are no problems such as glue hanging, bubbles and spraying.

[0079] Step 3: Test the dispensing position

[0080] After the glue test is complete, the displacement unit 2 is controlled to move the two glue spray valves 1 to their working positions, corresponding to the conveyor belt 5. The conveyor belt 5 is then started, and the object 51 to be glued is placed on the conveyor belt 5 and moved to test whether the glue dispensing position is at the target position. If there is a position deviation, the PLC control system adjusts the opening time of the two glue spray valves 1. When the glue dispensing position meets the process requirements, the equipment enters the standby working state. A guide rail is provided above the conveyor belt 5 corresponding to the glue dispensing machine to guide the object 51 to be glued and ensure its consistent position.

[0081] like Figure 1 As shown, in this embodiment, the object 51 to be glued is a bottle, and the glue dispensing machine dispenses glue on 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: Dispensing

[0083] 4.1. Conveyor belt 5 is started. When the first fiber optic sensor detects the bottle, it sends a 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 controlled to actuate and glue is dispensed. The delay time is set based on experience.

[0084] After the second optical fiber sensor detects the bottle, it sends a detection signal to the PLC control system. After an appropriate delay, the side of the bottle cap moves just in front of the horizontal glue spray valve 1, controlling the movement of the striker 17 of the horizontal glue spray valve 1 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 glued.

[0086] After dispensing the glue, a glue cap is placed on the bottle cap, and the glue cap is positioned by the glue dispensed to ensure that the position of the glue cap remains unchanged after heat shrinkage, thereby improving the anti-transfer effect of the glue cap. In other embodiments of the present invention, the number and setting angle of the glue spray valve 1 can be adjusted as needed, and can be set to one or more, and the multiple glue spray valves 1 work independently without interfering with each other.

[0087] To prevent glue from sticking, the control unit 3 can set the number of glue application cycles. Once the set number is reached, the displacement unit 2 controls the two glue spray valves 1 to the glue application platform to perform the application. During short production line downtime, the glue dispenser can enter a standby glue-dispensing mode to ensure glue fluidity and quickly resume production. In standby glue-dispensing mode, the device moves to the standby glue-dispensing position and cyclically dispenses glue at set intervals.

[0088] After dispensing, clean the dispensing machine without adjusting the pipeline. Figure 5 As shown, clean it by following the steps below:

[0089] S1. Remaining glue collection

[0090] Adjust the two glue spray valves 1 to the normally open mode, set the glue collection barrel 42 corresponding to the nozzle 12, and use compressed gas to spray the glue in the glue barrel 4, connecting pipes, and fluid channels along the nozzle 12 into the glue collection barrel 42.

[0091] S2. Glue pipeline cleaning

[0092] The cleaning agent is injected into the plastic barrel 4, and the compressed gas is controlled to discharge the cleaning agent from the discharge port of the plastic barrel 4 through the connecting pipe and fluid channel, and out of the nozzle 12 to the cleaning agent recovery barrel. The cleaning agent can be a strong organic solvent such as acetone, thinner, glue dissolving agent, alcohol solution, etc.

[0093] S3. Cleaning of spray valve 1

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

[0095] S3.2 Cleaning: The disassembled parts are placed in an ultrasonic cleaner filled with 95-99wt.% alcohol for 10 minutes. If there is too much glue in the nozzle 12 and the fluid channel, you can use other cleaning agents and then soak and clean;

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

Claims

1. A glue dispensing machine for glue cap packaging, characterized in that: The invention comprises 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 for controlling the movement of the glue spraying valve (1); The glue spray valve (1) comprises a valve body (11), a striker assembly and a piezoelectric module arranged in the valve body (11), a nozzle (12) arranged corresponding to the striker assembly, a flow channel assembly connected to the nozzle (12), and a heating seat (16); The flow channel assembly comprises a valve seat (14) arranged on the valve body (11), a through hole being formed on the valve seat (14), one end of the through hole being connected to the outlet of the valve body (11), and the other end of the through hole being connected to one end of the nozzle (12), a fluid channel being arranged inside the valve seat (14), one end of the fluid channel being connected to the nozzle (12), and the other end of the fluid channel being connected to the glue; The power unit is used to deliver glue to the fluid channel; The heating seat (16) is arranged below the valve seat (14) and surrounds the outer periphery of the nozzle (12), and includes a heating module for heating the nozzle (12) and the fluid channel; The striker assembly comprises a striker (17) and a compression spring (18); the bottom end of the striker (17) is arranged corresponding to the nozzle (12) and matches the inner end thereof, and the top end is connected to a piezoelectric module, which is used to control the movement of the striker (17); the compression spring (18) is sleeved at a position close to the top end of the striker (17) and is used to reset the striker (17); The control unit (3) comprises a sensor and a control module. The sensor is used to detect whether the object (51) to be dispensed 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 their working states and controls the working states of the piezoelectric module and the power unit according to the detection signal of the sensor.

2. The glue dispensing machine for glue cap packaging according to claim 1, characterized in that: The striker assembly also includes a guide shaft (19) arranged in correspondence with the through hole of the valve seat (14); the guide shaft (19), the through hole and the nozzle (12) are all coaxially arranged; the bottom end of the striker (17) passes through the guide shaft (19) and the through hole in sequence; and the compression spring (18) is located between the top end of the striker (17) and the guide shaft (19).

3. The glue dispensing machine for glue cap packaging according to claim 1 or 2, characterized in that: The number of the glue spraying valves (1) is two, which are respectively arranged at the front end of the displacement unit (2) in the horizontal direction and the vertical direction, and are used to realize glue spraying on different surfaces of the object (51) to be glued; The sensor comprises a first optical fiber sensor and a second optical fiber sensor, and the control module controls the working state of the piezoelectric modules of the glue spraying valves (1) arranged longitudinally and transversely according to the detection signals of the first optical fiber sensor and the second optical fiber sensor respectively.

4. The glue dispensing machine for glue cap packaging according to claim 3, characterized in that: It also includes a glue wiping platform and guide rails arranged 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); A guide ring (13) is provided at the inner end of the nozzle (12), the guide ring (13) is connected to the through hole correspondingly, and an O-ring (113) is provided for sealing; The power unit is compressed gas; The first optical fiber sensor is a through-beam sensor; the second optical fiber sensor is a reflective optical fiber sensor.

5. A dispensing method, based on the dispensing machine for glue cap packaging according to claim 1, characterized in that: The following steps are involved: Step 1. Preparation Connecting the fluid channel inlet of the glue spray valve (1) to the glue barrel (4), and connecting the glue barrel (4) to the power unit; adding glue to the glue barrel (4) and heating the glue barrel (4), adjusting the power unit, turning on the heating module, and initializing the moving unit; Step 2, test the glue Controlling the displacement unit (2) to move the glue spraying valve (1) to the standby glue spraying position, adjusting the glue dispensing amount to meet the process requirements, and performing glue dispensing tests to ensure that the glue dots dispensed meet the requirements; Step 3: Test the dispensing position The displacement unit (2) is controlled to move the glue spraying valve (1) to a working position. A conveyor belt (5) is set corresponding to the working position. The conveyor belt (5) is started. The object (51) to be glued is moved on the conveyor belt (5). It is tested whether the glue dispensing position is at the target position. If there is a position deviation, the opening time of the glue spraying valve (1) is adjusted. After the glue dispensing position meets the process requirements, the equipment enters a standby working state. Step 4: Dispense glue.

6. The dispensing method according to claim 5, characterized in that: In step 1, the power unit is compressed gas; the number of the glue spraying valves (1) is two, which are arranged in the horizontal direction and the vertical direction respectively; In step 2, the dispensing amount is adjusted by adjusting the compressed gas pressure, the piezoelectric module voltage, the piezoelectric module stroke and / or the dispensing time; Step 4 is as follows: 4.

1. Start the conveyor belt (5), and after the first optical fiber sensor detects the object to be glued (51), it sends a detection signal to the control module. When the object to be glued (51) moves just below the longitudinal glue spraying valve (1), the striker (17) of the longitudinal glue spraying valve (1) is controlled to move and glue is dispensed; After the second optical fiber sensor detects the object (51) to be glued, it sends a detection signal to the control module. When the object (51) to be glued moves just in front of the horizontal glue spraying valve (1), the striker (17) of the horizontal glue spraying valve (1) is controlled to move and glue is dispensed; 4.

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

7. A cleaning method, based on the glue dispensing machine for glue cap packaging according to claim 1, characterized in that: The following steps are involved: S1. Remaining glue collection The glue in the glue barrel (4), the glue spraying valve (1) and the connecting pipelines thereof are discharged through the power unit; S2. Glue pipeline cleaning A cleaning agent is injected into the glue barrel (4), and the power unit is controlled to inject the cleaning agent from the glue barrel (4) into the glue spraying valve (1) and then discharge it.

8. The cleaning method according to claim 7, characterized in that: Step S1 is specifically as follows: The number of the glue spraying valves (1) is two, which are arranged in the transverse direction and the longitudinal direction respectively; the two glue spraying valves (1) are set in a normally open mode, and the glue in the glue barrel (4), the glue spraying valve (1) and the connecting pipelines thereof are discharged into a glue collection container through a power unit.

9. The cleaning method according to claim 7 or 8, characterized in that: The method further comprises step S3, cleaning the glue spraying valve (1): S3.

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

2. Cleaning: Place each disassembled part in a cleaning agent for ultrasonic cleaning; S3.

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

10. The cleaning method according to claim 9, characterized in that: In step S2, the cleaning agent is 95-99 wt.% ethanol solution, acetone, thinner or a dissolving agent.

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