Hot melt adhesive dispensing device and control system

Abstract

The utility model discloses a control system of a hot melt adhesive dispensing device. The hot melt adhesive dispensing device comprises a charging barrel, a liquid box, a heating assembly and a monitoring assembly, a material cavity for loading hot melt adhesive fluid is formed in the charging barrel; the liquid box is installed on the charging barrel and provided with a nozzle and an air pressure valve, a flow channel communicating with the material cavity and the nozzle is formed in the liquid box, and the air pressure valve is used for extruding the hot melt adhesive fluid in the flow channel to the nozzle; the heating assembly comprises a first heating piece which is mounted on the charging barrel and is used for heating the material cavity and a second heating piece which is mounted on the liquid box and is used for heating the runner; the monitoring assembly comprises a first temperature sensor mounted on the charging barrel and used for monitoring the temperature of the material cavity and a second temperature sensor mounted on the liquid box and used for monitoring the temperature of the runner; through cooperative use of the structures, a hot melt adhesive fluid can be kept at a constant temperature in the flowing process, the property change of the hot melt adhesive fluid is avoided, and the adhesive dispensing effect is ensured; the control system comprises the hot melt adhesive dispensing device and a control unit, and has corresponding advantages.

Description

Technical Field

[0001] This utility model belongs to the field of hot melt adhesive dispensing technology, and in particular relates to a hot melt adhesive dispensing device and control system. Background Technology

[0002] A hot melt adhesive dispensing device is a device that melts solid hot melt adhesive into a liquid state by heating it and then dispensing it through a nozzle. It is widely used in industrial manufacturing such as automobiles, airplanes, and ships.

[0003] Existing hot melt adhesive dispensing devices mainly consist of a material cylinder, a liquid tank, a heating element, and a nozzle. The heating element is installed on the material cylinder to heat the hot melt adhesive fluid. The liquid tank is installed on the material cylinder and is equipped with a nozzle and a pressure valve. The liquid tank has a flow channel connecting the material cylinder and the nozzle. The pressure valve can squeeze the hot melt adhesive flow entering the flow channel to the nozzle, so that it can be sprayed out to the outside for dispensing operations. It is simple and convenient to use.

[0004] However, in actual use, it was found that the hot melt adhesive fluid loses heat after entering the flow channel from the barrel, which causes changes in the properties of the hot melt adhesive fluid, resulting in deviations from the preset parameters and affecting the dispensing effect.

[0005] Therefore, it is necessary to design a new hot melt adhesive dispensing device and control system to solve the above problems. Utility Model Content

[0006] Technical problems to be solved

[0007] This invention provides a hot melt adhesive dispensing device and control system, which can maintain a constant temperature during the flow of hot melt adhesive fluid, keep the properties of hot melt adhesive fluid stable, avoid changes in the properties of hot melt adhesive fluid, and improve the dispensing effect.

[0008] Technical solution

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A hot melt adhesive dispensing device includes a material cylinder, a liquid container, a heating component, and a monitoring component. The material cylinder has a material cavity for loading hot melt adhesive fluid. The liquid container is mounted on the material cylinder and includes a nozzle and a pressure valve. The liquid container has a flow channel connecting the material cavity and the nozzle. The pressure valve is used to expel the hot melt adhesive fluid in the flow channel to the nozzle. The heating component includes a first heating element and a second heating element. The first heating element is mounted on the material cylinder and used to heat the material cavity. The second heating element is mounted on the liquid container and used to heat the flow channel. The monitoring component includes a first temperature sensor and a second temperature sensor. The first temperature sensor is mounted on the material cylinder and used to monitor the temperature inside the material cavity. The second temperature sensor is mounted on the liquid container and used to monitor the temperature inside the flow channel.

[0011] Preferably, the liquid box is detachably provided with a mounting base, and the second heating element and the second temperature sensor are both disposed on the mounting base and correspond to the flow channel.

[0012] Preferably, a first terminal block is installed on the material cylinder, the first terminal block being electrically connected to the first heating element and the first temperature sensor, and the first terminal block being used for external power supply; a second terminal block is also installed on the liquid box, the second terminal block being electrically connected to the second heating element and the second temperature sensor, and the second terminal block being used for external power supply; the above design facilitates the power supply and power disconnection of the first heating element, the first temperature sensor, the second heating element, and the second temperature sensor.

[0013] Preferably, it further includes a fastening assembly, which includes a fixing base, an inner cylinder, and a heat insulation cylinder. The inner cylinder is sleeved on the material cylinder, and the first heating element and the first temperature sensor are both installed on the inner cylinder. The heat insulation cylinder is installed on the fixing base and sleeved on the inner cylinder.

[0014] Preferably, the mounting base is also fixed to the pneumatic valve.

[0015] Preferably, the fixing seat holds the heat insulation cylinder by a fixing clamp.

[0016] Preferably, the device further includes a drive assembly. The end of the material cylinder away from the liquid box is provided with a feed inlet that connects the material chamber to the outside. A cylinder cover is provided at the feed inlet. The drive assembly is mounted on the heat insulation cylinder and drivenly connected to the cylinder cover to drive the cylinder cover to open or close the feed inlet.

[0017] Preferably, a heat insulation plate is provided at the connection between the heat insulation cylinder and the drive assembly.

[0018] Preferably, the drive assembly includes a connecting seat, a knob, a screw, and a guide post; the connecting seat is mounted on the heat insulation cylinder, specifically on a heat insulation plate, and the connecting seat has a movable cavity inside, with a guide groove on the side wall of the movable cavity; the screw is disposed in the movable cavity and fixed to the cylinder cover; the guide post is mounted on the side wall of the screw and slides in cooperation with the guide groove; the knob is rotatably mounted on the connecting seat and threadedly connected to the screw; rotating the knob can drive the screw to move along the guide groove, thereby causing the cylinder cover to open or close the feed port.

[0019] Preferably, the cylinder cover and the feed inlet are sealed, and the cylinder cover is provided with an air hole that connects to the material chamber, and the screw is provided with an air passage that connects to the outside and the air hole.

[0020] Preferably, a valve nozzle is also installed on the liquid box. The valve nozzle is located at the connection between the material cylinder and the liquid box, and a through groove is provided inside the valve nozzle. The flow channel is connected to the material chamber through the through groove. A valve core can also be rotatably installed on the valve nozzle. The core section of the valve core extends through the through groove, and a through hole is provided on the core section of the valve core. Rotating the valve core can drive the through hole to be misaligned or aligned with the through groove, so as to block or open the through groove.

[0021] Preferably, the flow channel is L-shaped and divided into a vertical section and a horizontal section. The valve nozzle is located at the beginning of the vertical section of the flow channel, the nozzle is located at the end of the horizontal section of the flow channel, and the first heating element and the first temperature sensor are respectively located on the side of the horizontal section of the flow channel.

[0022] Preferably, both the first heating element and the second heating element are electric heating rods, and both the first temperature sensor and the second temperature sensor are thermocouples.

[0023] A hot melt adhesive dispensing control system includes a hot melt adhesive dispensing device and a control unit. The control unit includes a power module, a first temperature controller, an AD solid-state relay, a second temperature controller, and a DD solid-state relay. The power module, the first temperature controller, the AD solid-state relay, the second temperature controller, the DD solid-state relay, the first heating element, the second heating element, the first temperature sensor, and the second temperature sensor are electrically connected. The power module can be connected to an external power source. The first temperature controller and the second temperature controller can be synchronously set to the same first temperature. The first temperature controller transmits a temperature signal to the AD solid-state relay, which controls the first heating element to heat up, so that the material cavity reaches the first temperature. The first temperature sensor transmits the monitored temperature signal to the first temperature controller to form a closed loop. The second temperature controller transmits a temperature signal to the DD solid-state relay, which controls the second heating element to heat up, so that the flow channel reaches the first temperature. The second temperature sensor transmits the monitored temperature signal to the second temperature controller to form a closed loop.

[0024] Preferably, the second temperature controller can also be preset to a second temperature, which is greater than the first temperature.

[0025] (III) Beneficial Effects

[0026] This utility model provides a hot melt adhesive dispensing device and control system. By setting a first heating element and a second heating element on the material cylinder and liquid tank respectively, both the material cavity and the flow channel can be heated. By setting a first temperature sensor and a second temperature sensor on the material cylinder and liquid tank respectively, the temperature of the material cavity and the flow channel can be monitored. The above structures work together to facilitate users to control the temperature of the hot melt adhesive fluid entering the flow channel from the material cavity, so that the hot melt adhesive fluid maintains a constant temperature during the flow process, ensuring that the properties of the hot melt adhesive fluid remain stable, avoiding changes in the properties of the hot melt adhesive fluid, and improving the dispensing effect. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 A schematic diagram of the overall structure of this utility model is shown. Figure 1 ;

[0029] Figure 2 It shows Figure 1 A bottom view;

[0030] Figure 3 It shows Figure 2 AA section view;

[0031] Figure 4 It shows Figure 2 BB section view;

[0032] Figure 5 A schematic diagram of the overall structure of this utility model is shown. Figure 2 ;

[0033] Figure 6 A schematic diagram of the liquid box and valve nozzle of this utility model is shown;

[0034] Figure 7 It shows Figure 6 The main view;

[0035] Figure 8 It shows Figure 7 CC section view;

[0036] Figure 9 It shows Figure 6 A schematic diagram of the decomposition process;

[0037] Figure 10 A partial structural schematic diagram of this utility model is shown;

[0038] Figure 11 It shows Figure 10 The main view;

[0039] Figure 12 It shows Figure 11 DD sectional view;

[0040] Figure 13 It shows Figure 10 Decomposition diagram Figure 1 ;

[0041] Figure 14 It shows Figure 10 Decomposition diagram Figure 2 ;

[0042] Figure 15 A schematic diagram of the control unit of this utility model is shown.

[0043] In the diagram: 1. Material cylinder, 10. Material chamber, 101. Inlet, 11. Cylinder cover, 110. Air hole, 111. Conical sealing ring, 12. First terminal block, 2. Liquid box, 20. Flow channel, 21. Nozzle, 22. Air pressure valve, 23. Mounting seat, 24. Second terminal block, 3. Heating assembly, 31. First heating element, 32. Second heating element, 4. Monitoring assembly, 41. First temperature sensor, 42. Second temperature sensor, 5. Fastening assembly, 51. Fixing seat, 510. Fixing clamp, 52. Inner cylinder, 53. Heat insulation cylinder, 530. Heat insulation plate, 6. Drive assembly, 61. Connecting seat, 610. Movable cavity, 611. Guide groove, 62. Knob, 63. Screw, 630. Air passage, 64. Guide post, 7. Valve nozzle, 70. Through groove, 71. Valve core, 710. Through hole. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit this application. The connection relationships shown in the accompanying drawings are only for clear description and do not limit the connection method.

[0045] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be noted that, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application.

[0046] See appendix Figure 1 - Appendix Figure 14A hot melt adhesive dispensing device includes a material cylinder 1, a liquid container 2, a heating assembly 3, and a monitoring assembly 4. The material cylinder 1 has a material cavity 10 for loading hot melt adhesive fluid. The liquid container 2 is mounted on the material cylinder 1 and has a nozzle 21 and a pressure valve 22. The liquid container 2 has a flow channel 20 connecting the material cavity 10 and the nozzle 21. The pressure valve 22 is used to squeeze the hot melt adhesive fluid in the flow channel 20 to the nozzle 21. The heating assembly 3 includes a first heating element 31 and a second heating element 32. The first heating element 31 is mounted on the material cylinder 1 and is used to heat the material cavity 10. The second heating element 32 is mounted on the liquid container 2 and is used to heat the flow channel 20. The monitoring assembly 4 includes a first temperature sensor 41 and a second temperature sensor 42. The first temperature sensor 41 is mounted on the material cylinder 1 and is used to monitor the internal temperature of the material cavity 10. The second temperature sensor 42 is mounted on the liquid container 2 and is used to monitor the internal temperature of the flow channel 20.

[0047] Specifically, during use, the first heating element 31 is activated to heat the hot melt adhesive fluid in the material chamber 10, while the first temperature sensor 41 is used to monitor the current temperature of the material chamber 10, allowing the user to control the actual heating temperature of the hot melt adhesive fluid within a suitable range. At the same time, the second heating element 32 is activated to heat the flow channel 20. After the hot melt adhesive fluid in the material chamber 10 enters the flow channel 20, the second temperature sensor 42 detects and monitors the current temperature of the flow channel 20. If the temperature of the flow channel 20 detected by the second temperature sensor 42 is inconsistent with the temperature of the material chamber 10, the power of the second heating element 32 is increased to continue heating until the temperature of the flow channel 20 is consistent with the temperature of the material chamber 10. Then, the air pressure valve 22 is activated to squeeze the hot melt adhesive fluid in the flow channel 20 to the nozzle and make it overflow from the nozzle for dispensing.

[0048] In summary, this utility model, by respectively setting a first heating element 31 and a second heating element 32 on the material cylinder 1 and the liquid box 2, allows both the material cavity 10 and the flow channel 20 to be heated. By respectively setting a first temperature sensor 41 and a second temperature sensor 42 on the material cylinder 1 and the liquid box 2, the temperatures of the material cavity 10 and the flow channel 20 can be monitored. The above design structure is simple, reliable and convenient to use, and allows users to control the temperature of the hot melt adhesive fluid entering the flow channel 20 from the material cavity 10. This ensures that the hot melt adhesive fluid maintains a constant temperature during the flow process, ensuring that the properties of the hot melt adhesive fluid remain stable, thus avoiding changes in the properties of the hot melt adhesive fluid and improving the dispensing effect.

[0049] It should be noted that before use, the user can put the hot melt adhesive strip or the hot melt adhesive fluid directly into the material chamber 10. If the hot melt adhesive strip is placed into the material chamber 10, it needs to be melted into hot melt adhesive fluid by the first heating element 31 before subsequent heating treatment. On the other hand, the structure of the air pressure valve 22 and the structure of squeezing the hot melt adhesive in the flow channel 20 to the nozzle 21 for dispensing through the air pressure valve 22 are existing technologies. Therefore, the specific structure of the air pressure valve 22 and the method of squeezing the hot melt adhesive are not described in detail in this utility model.

[0050] See appendix Figure 6 - Appendix Figure 9 The liquid box 2 is detachably provided with a mounting base 23. The second heating element 32 and the second temperature sensor 42 are both mounted on the mounting base 23 and correspond to the flow channel 20. This design allows the second heating element 32 and the second temperature sensor 42 to be stably mounted on the side of the flow channel 20.

[0051] See appendix Figure 9 - Appendix Figure 14 A first terminal block 12 is installed on the material cylinder 1. The first terminal block 12 is electrically connected to the first heating element 31 and the first temperature sensor 41, and the first terminal block 12 is used for external power supply. A second terminal block 24 is installed on the liquid box 2. The second terminal block 24 is electrically connected to the second heating element 32 and the second temperature sensor 42, and the second terminal block 24 is used for external power supply.

[0052] See appendix Figure 1 - Appendix Figure 5 and attached Figure 10 - Appendix Figure 14 The present invention also includes a fastening assembly 5, which includes a fixing base 51, an inner cylinder 52 and a heat insulation cylinder 53. The inner cylinder 52 is sleeved on the material cylinder 1. The first heating element 31 and the first temperature sensor 41 are both installed on the inner cylinder 52. The heat insulation cylinder 53 is installed on the fixing base 51 and sleeved on the inner cylinder 52.

[0053] Specifically, the inner cylinder 52 provides installation space for the first heating element 31 and the first temperature sensor 41, making it easy for the first heating element 31 and the first temperature sensor 41 to be stably placed on the side of the material cylinder 1; the heat insulation cylinder 53 prevents heat loss and avoids accidental injury to the user; and the fixed base 51 makes it easy for the user to install this dispensing device on automated equipment such as a robot (not shown in the figure), improving usability.

[0054] Furthermore, the mounting base 51 is also fixed to the air pressure valve 22. This design can improve the installation stability of the air pressure valve 22 and the liquid box 2, prevent the air pressure valve 22 from causing vibration of the liquid box 2 during operation, and ensure that the nozzle on the liquid box 2 can dispense glue stably.

[0055] See appendix Figure 1 - Appendix Figure 5 There are various ways to install the fixed base 51 and the heat insulation cylinder 53. This utility model does not limit this. For easy assembly and disassembly, the fixed base 51 in this embodiment clamps the heat insulation cylinder 53 with a fixing clip 510. The specific structure of the fixing clip 510 can be referred to the attached drawings. Since it is an existing product, it will not be described in detail here.

[0056] See appendix Figure 1 - Appendix Figure 5 The present invention also includes a drive assembly 6. The end of the material cylinder 1 away from the liquid box 2 is provided with a feed inlet 101 that connects the material chamber 10 and the outside. The material cylinder 1 is provided with a cylinder cover 11 at the feed inlet 101. The drive assembly 6 is installed on the heat insulation cylinder 53 and is drivenly connected to the cylinder cover 11 to drive the cylinder cover 11 to open or close the feed inlet 101. This structural design allows users to open and close the feed inlet 101 to replenish hot melt adhesive strips or hot melt adhesive fluid without contacting the heat insulation cylinder 53, thus improving operational safety.

[0057] See appendix Figure 1 - Appendix Figure 5 A heat insulation plate 530 can also be installed at the connection between the heat insulation cylinder 53 and the drive assembly 6. The design of the heat insulation plate 530 can prevent the components near the feed inlet 101 from being heated by heat conduction, which would cause difficulties in feeding. At the same time, it can also prevent the seal between the cylinder cover 11 and the feed inlet 101 from being damaged, thus extending the overall service life.

[0058] See appendix Figure 1 - Appendix Figure 5 and attached Figure 10 - Appendix Figure 14 The drive assembly 6 includes a connecting seat 61, a knob 62, a screw 63, and a guide post 64. The connecting seat 61 is mounted on the heat insulation cylinder 53, specifically on the heat insulation plate 530, and the connecting seat 61 has a movable cavity 610 inside, with a guide groove 611 on the side wall of the movable cavity 610. The screw 63 is disposed in the movable cavity 610 and fixed to the cylinder cover 11. The guide post 64 is mounted on the side wall of the screw 63 and slides in cooperation with the guide groove 611. The knob 62 is rotatably mounted on the connecting seat 61 and threadedly connected to the screw 63. Rotating the knob 62 can drive the screw 63 to move along the guide groove 611, thereby causing the cylinder cover 11 to open or close the feed port 101.

[0059] Specifically, when hot melt adhesive needs to be replenished, the knob 62 is rotated in the reverse direction to drive the screw 63. Under the constraint of the guide post 64 and the guide groove 611, the screw 63 moves upward along the guide groove 611 to drive the cover 11 to open the feed port 101. After the hot melt adhesive is replenished, the knob 62 is rotated in the forward direction to drive the screw 63. Under the constraint of the guide post 64 and the guide groove 611, the screw 63 moves downward along the guide groove 611 to drive the cover 11 to close the feed port 101. This structural design allows the cover 11 to open or close the feed port 101 by moving up and down, avoiding rotational friction between the cover 11 and the barrel 1, extending the service life, and facilitating sealing between the two.

[0060] It should be noted that, in addition to the above structure, the drive assembly 6 can also use other manually driven components, or directly use electric components such as lead screw motors or electric cylinders with travel stroke (not shown in the figure). Due to the variety of related structures, this utility model does not impose any restrictions on this.

[0061] See appendix Figure 1 - Appendix Figure 5 and attached Figure 10 - Appendix Figure 13 The cylinder cover 11 and the feed inlet 101 are sealed together, and the cylinder cover 11 is provided with an air hole 110 that connects to the material chamber 10. The screw 63 is provided with an air passage 630 that connects to the outside and the air hole 110.

[0062] A conical sealing ring 111 can be installed on the cylinder cover 11. When the cylinder cover 11 closes the feed inlet 101, the conical sealing ring 111 abuts against the inner wall of the cylinder 1 to achieve a seal. Other methods can also be used to achieve a seal. Since there are various sealing methods between the cylinder cover 11 and the feed inlet 101, this utility model does not limit them. The design of the air hole 110 and the air channel 630 allows the material cavity 10 to be connected to an external air supply device (not shown in the figure), which facilitates the use of air pressure to squeeze the hot melt adhesive fluid in the material cavity 10 into the flow channel 20.

[0063] See appendix Figure 3 - Appendix Figure 9Existing hot melt adhesive dispensing devices suffer from adhesive leakage. This is because after the hot melt adhesive in the cylinder 1 is used up, a small amount of hot melt adhesive fluid remains in the material chamber 10. During material replacement or cylinder 1 replacement, the residual hot melt adhesive fluid falls into the flow channel 20 and contaminates the internal structure, causing inconvenience for subsequent cleaning and use. To solve this problem, the liquid box 2 in this invention is also equipped with a valve nozzle 7. The valve nozzle 7 is located at the connection between the cylinder 1 and the liquid box 2, and the valve nozzle 7 has a through groove 70 inside. The flow channel 20 is connected to the material chamber 10 through the through groove 70. A valve core 71 can also be rotatably installed on the valve nozzle 7. The core section of the valve core 71 extends into the through groove 70, and the core section of the valve core 71 has a through hole 710. Rotating the valve core 71 can drive the through hole 710 to be misaligned or aligned with the through groove 70, thereby blocking or opening the through groove 70.

[0064] Specifically, when it is necessary to change the material or replace the cylinder 1, the valve core 71 is rotated to drive the through hole 710 to be offset from the through groove 70, so that the core section of the valve core 71 blocks the through groove 70 and prevents the residual hot melt adhesive fluid from entering the flow channel 20; when it is necessary to perform dispensing operation, wait for the temperature of the hot melt adhesive fluid in the material chamber 10 to meet the requirements, and then rotate the valve core 71 to drive the through hole 710 to align with the through groove 70, so that the core section of the valve core 71 opens the through groove 70, so that the hot melt adhesive fluid in the material chamber 10 can be discharged into the flow channel 20.

[0065] Therefore, the combined use of valve nozzle 7 and valve core 71 can cut off the connection between material chamber 10 and flow channel 20 when necessary, making it convenient to maintain the cleanliness of the inside of flow channel 20; in addition, this design can also prevent hot melt adhesive fluid in material chamber 10 that has not reached the standard temperature from directly entering flow channel 20, ensuring the dispensing effect.

[0066] See appendix Figure 3 - Appendix Figure 9 The flow channel 20 is L-shaped and divided into a vertical section and a horizontal section. The valve nozzle 7 is located at the beginning of the vertical section of the flow channel 20, and the nozzle 21 is located at the end of the horizontal section of the flow channel 20. The first heating element 31 and the first temperature sensor 41 are respectively located on the side of the horizontal section of the flow channel 20.

[0067] Specifically, the flow channel 20 is L-shaped, which can reduce the volume of the liquid box 2 and save installation space; on the other hand, the horizontal section of the flow channel 20 keeps the hot melt adhesive fluid inside horizontal, which makes it convenient for the second heating element 32 to heat the hot melt adhesive fluid for a long time, and also makes it convenient for the second temperature sensor 42 to monitor the temperature of the hot melt adhesive fluid more accurately.

[0068] See appendix Figure 9 - Appendix Figure 13The types of the first heating element 31, the second heating element 32, the first temperature sensor 41, and the second temperature sensor 42 are diverse, and no limitation is made in this utility model; for ease of understanding, in this embodiment, the first heating element 31 and the second heating element 32 are both heating rods, and the first temperature sensor 41 and the second temperature sensor 42 are both thermocouples.

[0069] Among them, the heating rod heats up as soon as it is powered on, and the heating temperature varies with the current, making it convenient for users to control the temperature; the thermocouple can directly measure the temperature and has many advantages such as simple structure, easy manufacturing, wide measurement range, high accuracy, low inertia, and easy long-distance transmission of output signals.

[0070] See appendix Figure 1 - Appendix Figure 15 A hot melt adhesive dispensing control system includes a hot melt adhesive dispensing device and a control unit. The control unit includes a power module, a first temperature controller, an AD solid-state relay, a second temperature controller, and a DD solid-state relay. The power module, the first temperature controller, the AD solid-state relay, the second temperature controller, the DD solid-state relay, a first heating element 31, a second heating element 32, a first temperature sensor 41, and a second temperature sensor 42 are electrically connected. The power module can be connected to an external power source. The first temperature controller and the second temperature controller can be synchronously set to the same first temperature. The first temperature controller transmits a temperature signal to the AD solid-state relay, which controls the first heating element 31 to heat up, so that the material cavity 10 reaches the first temperature. The first temperature sensor 41 is used to transmit the monitored temperature signal to the first temperature controller to form a closed loop. The second temperature controller transmits a temperature signal to the DD solid-state relay, which controls the second heating element 32 to heat up, so that the flow channel 20 reaches the first temperature. The second temperature sensor 42 is used to transmit the monitored temperature signal to the second temperature controller to form a closed loop.

[0071] Specifically, the control unit, when used in conjunction with the hot melt adhesive dispensing device, simplifies and automates the temperature control of the material chamber 10 and the flow channel 20, making it convenient to maintain the hot melt adhesive fluid at a constant temperature for dispensing operations.

[0072] For ease of understanding, the specific steps of using the hot melt adhesive dispensing control system are illustrated in this embodiment as follows:

[0073] S1. Connect an external power source to the power module to maintain a normal power supply;

[0074] S2. After the hot melt glue stick is placed into the material cylinder 1, the first temperature is set by the first temperature controller. The first temperature controller transmits the temperature signal to the AD relay. The AD relay controls the first heating element 31 to heat the material chamber 10 to the first temperature, so as to melt the hot melt glue stick and form hot melt glue fluid. When the first temperature sensor 41 detects that the temperature of the hot melt glue fluid in the material chamber 10 has reached the first temperature, it transmits the data to the first temperature controller to form a heating closure and continue heating. At this time, the hot melt glue fluid in the material chamber 10 can be discharged into the flow channel 20.

[0075] S3. The first temperature is set by the second temperature controller. The temperature signal of the second temperature controller is transmitted to the DD relay. The DD relay controls the second heating element 32 to heat the flow channel 20 to reach the first temperature. When the second temperature sensor 42 detects that the temperature of the hot melt adhesive fluid in the flow channel 20 has reached the first temperature, it transmits the data to the second temperature controller to form a heating closure and continue heating.

[0076] S4. When the first temperature sensor 41 detects that the temperature of the material chamber 10 is stably maintained at the first temperature, and the second temperature sensor 42 detects that the temperature of the flow channel 20 is stably maintained at the first temperature, the hot melt adhesive fluid in the flow channel 20 is squeezed to the nozzle 21 through the air pressure valve 22 for dispensing, and at the same time the hot melt adhesive fluid in the material chamber 10 is continuously discharged into the flow channel 20 for feeding.

[0077] It should be noted that in step S4, if the temperature of the hot melt adhesive fluid entering the flow channel 20 decreases or increases, causing the second temperature sensor 42 to detect that the temperature of the flow channel 20 is lower or higher than the first temperature, the second temperature controller will adjust the power of the second heating element 32 until the second temperature sensor 42 detects that the temperature of the flow channel 20 is maintained at the first temperature before the dispensing operation is performed.

[0078] See appendix Figure 1 - Appendix Figure 8 Two first heating elements 31 can be provided to surround the material cylinder 1, and both first heating elements 31 are connected to the first temperature controller signal; this design allows the material chamber 10 to be heated faster, improving working efficiency.

[0079] See appendix Figure 1 - Appendix Figure 8 The second temperature controller can also be preset to a second temperature, which is greater than the first temperature.

[0080] Specifically, before use, the second heating element 32 is preset to a second temperature by the second temperature controller, which preheats the flow channel 20 to melt the hot melt adhesive remaining in the flow channel 20. Then, the material chamber 10 is heated to a first temperature by the first temperature controller, so that the hot melt adhesive fluid in the material chamber 10 enters the flow channel 20 and carries the residual adhesive out of the nozzle 21. After the residual adhesive in the flow channel 20 is discharged, the hot melt adhesive fluid in the material chamber 10 continues to be discharged into the flow channel 20, and the power of the second heating element 32 is controlled by the second temperature controller to adjust the flow channel 20 to the first temperature, and then the dispensing operation can be performed.

[0081] Therefore, setting the second temperature higher than the first temperature is beneficial for cleaning the residual hot melt adhesive in the flow channel 20, and also allows the heat lost when the hot melt adhesive fluid enters the flow channel 20 to be quickly compensated, so that the second temperature controller can control the second heating element 32 to quickly heat the hot melt adhesive fluid in the flow channel 20 and maintain it at the first temperature.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot melt glue dispensing apparatus, characterized by, include: A material cylinder, wherein the inside of the material cylinder is provided with a material cavity for loading hot melt adhesive fluid; The liquid box is mounted on the material cylinder and has a nozzle and a pressure valve. The liquid box has a flow channel inside that connects the material chamber and the nozzle. The pressure valve is used to squeeze the hot melt adhesive fluid in the flow channel to the nozzle. A heating assembly, comprising a first heating element and a second heating element, wherein the first heating element is mounted on the material cylinder and used to heat the material cavity, and the second heating element is mounted on the liquid box and used to heat the flow channel; The monitoring component includes a first temperature sensor and a second temperature sensor. The first temperature sensor is installed on the material cylinder and is used to monitor the temperature inside the material chamber. The second temperature sensor is installed on the liquid box and is used to monitor the temperature inside the flow channel.

2. The hot melt glue dispensing device of claim 1, wherein, It also includes a fastening assembly, which includes a fixing base, an inner cylinder, and a heat insulation cylinder. The inner cylinder is fitted onto the material cylinder, and the first heating element and the first temperature sensor are both mounted on the inner cylinder. The heat insulation cylinder is mounted on the fixing base and fitted onto the inner cylinder.

3. The hot melt adhesive dispensing device according to claim 2, characterized in that, It also includes a drive assembly, wherein the end of the material cylinder away from the liquid box is provided with a feed inlet that connects the material chamber to the outside, and the material cylinder is provided with a cylinder cover at the feed inlet; the drive assembly is mounted on the heat insulation cylinder and drivenly connected to the cylinder cover to drive the cylinder cover to open or close the feed inlet.

4. The hot melt adhesive dispensing device according to claim 3, characterized in that, The drive assembly includes a connecting seat, a knob, a screw, and a guide post; the connecting seat is mounted on the heat insulation cylinder, and the connecting seat has a movable cavity inside, with a guide groove on the side wall of the movable cavity; the screw is disposed in the movable cavity and fixed to the cylinder cover; the guide post is mounted on the side wall of the screw and slides in cooperation with the guide groove; the knob is rotatably mounted on the connecting seat and threadedly connected to the screw; rotating the knob can drive the screw to move along the guide groove, thereby causing the cylinder cover to open or close the feed port.

5. The hot melt glue dispensing apparatus of claim 4, wherein, The cylinder cover and the feed inlet are sealed together, and the cylinder cover is provided with an air hole that connects to the material chamber. The screw is provided with an air passage that connects to the outside and the air hole.

6. The hot melt adhesive dispensing device according to claim 1, characterized in that, The liquid box is also equipped with a valve nozzle, which is located at the connection between the material cylinder and the liquid box. The valve nozzle has a through groove inside, and the flow channel is connected to the material chamber through the through groove. A valve core can also be rotatably installed on the valve nozzle. The core section of the valve core extends through the through groove, and the core section of the valve core has a through hole. Rotating the valve core can drive the through hole to be misaligned or aligned with the through groove, so as to block or open the through groove.

7. The hot melt glue dispensing apparatus of claim 6, wherein, The flow channel is L-shaped and divided into a vertical section and a horizontal section. The valve is located at the beginning of the vertical section of the flow channel, and the nozzle is located at the end of the horizontal section of the flow channel. The first heating element and the first temperature sensor are respectively located on the side of the horizontal section of the flow channel.

8. The hot melt glue dispensing apparatus of claim 1, wherein, Both the first heating element and the second heating element are electric heating rods, and both the first temperature sensor and the second temperature sensor are thermocouples.

9. A hot melt glue dispensing control system comprising a hot melt glue dispensing device according to any one of claims 1 to 8, characterized in that It also includes a control unit, which comprises a power module, a first temperature controller, an AD solid-state relay, a second temperature controller, and a DD solid-state relay; the power module, the first temperature controller, the AD solid-state relay, the second temperature controller, the DD solid-state relay, the first heating element, the second heating element, the first temperature sensor, and the second temperature sensor are electrically connected to each other; The power module can be connected to an external power source; the first temperature controller and the second temperature controller can be synchronously set to the same first temperature; the first temperature controller transmits the temperature signal to the AD solid-state relay, and the AD solid-state relay controls the first heating element to heat up, so that the inside of the material chamber reaches the first temperature; the first temperature sensor is used to transmit the monitored temperature signal to the first temperature controller to form a closed loop; the second temperature controller transmits the temperature signal to the DD solid-state relay, and the DD solid-state relay controls the second heating element to heat up, so that the inside of the flow channel reaches the first temperature; the second temperature sensor is used to transmit the monitored temperature signal to the second temperature controller to form a closed loop.

10. A hot melt adhesive dispensing control system according to claim 9, characterized in that, The second temperature controller can also be preset to a second temperature, which is greater than the first temperature.

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