Hot melt adhesive dispensing device and control system

Abstract

The invention 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] The present invention belongs to the technical field of hot melt adhesives, and particularly relates to a hot melt adhesive dispensing device and a control system. Background Art

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

[0003] The existing hot melt adhesive dispensing device mainly consists of a barrel, a liquid box, a heating element, and a nozzle. Among them, the heating element is installed on the barrel to heat the hot melt adhesive fluid. The liquid box is installed on the barrel and is equipped with a nozzle and a pneumatic valve. A flow channel connecting the barrel and the nozzle is provided inside the liquid box. The pneumatic valve can squeeze the hot melt adhesive flow entering the flow channel to the nozzle, causing it to spray out to the outside for dispensing operations, which is simple and convenient to use.

[0004] However, it is found in the actual use process that there is heat loss when the hot melt adhesive fluid enters the flow channel from the barrel, which will cause changes in the properties of the hot melt adhesive fluid, resulting in a deviation from the pre-set parameters and affecting the dispensing effect.

[0005] In view of this, it is very necessary to design a new hot melt adhesive dispensing device and a control system to solve the above problems. Summary of the Invention

[0006] Technical Problems to be Solved The present invention provides a hot melt adhesive dispensing device and a control system, which can maintain a constant temperature during the flow of the hot melt adhesive fluid, keep the properties of the hot melt adhesive fluid stable, avoid changes in the properties of the hot melt adhesive fluid, and improve the dispensing effect.

[0007] Technical Solutions To achieve the above object, the present invention provides the following technical solutions: A hot melt adhesive dispensing device includes a barrel, a liquid box, a heating assembly, and a monitoring assembly; a material cavity for loading the hot melt adhesive fluid is provided inside the barrel; the liquid box is installed on the barrel and is equipped with a nozzle and a pneumatic valve, and a flow channel connecting the material cavity and the nozzle is provided inside the liquid box, and the pneumatic valve is used to squeeze the hot melt adhesive fluid in the flow channel to the nozzle; the heating assembly includes a first heating element and a second heating element, the first heating element is installed on the barrel and is used to heat the material cavity, and the second heating element is installed on the liquid box and is used to heat the flow channel; the monitoring assembly includes a first temperature sensor and a second temperature sensor, the first temperature sensor is installed on the barrel and is used to monitor the internal temperature of the material cavity, and the second temperature sensor is installed on the liquid box and is used to monitor the internal temperature of the flow channel.

[0008] Preferably, a mounting seat is detachably provided on the liquid cartridge, and the second heating element and the second temperature sensor are both arranged on the mounting seat and correspond to the flow channel.

[0009] Preferably, a first wiring seat is mounted on the cartridge, the first wiring seat is electrically connected to the first heating element and the first temperature sensor, and the first wiring seat is used for external power supply; a second wiring seat is also mounted on the liquid cartridge, the second wiring seat is electrically connected to the second heating element and the second temperature sensor, and the second wiring seat is used for external power supply; the above design facilitates the power supply and power off of the first heating element, the first temperature sensor, the second heating element and the second temperature sensor.

[0010] Preferably, a fastening assembly is further included, the fastening assembly includes a fixed seat, an inner cylinder and a heat insulation cylinder, the inner cylinder sleeves the cartridge, 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 fixed seat and sleeves the inner cylinder.

[0011] Preferably, the fixed seat also fixedly connects the pneumatic valve.

[0012] Preferably, the fixed seat clamps the heat insulation cylinder through a fixing clip.

[0013] Preferably, a driving assembly is further included, a feed inlet communicating the material cavity and the outside is provided at one end of the cartridge away from the liquid cartridge, and a cartridge cover is provided at the feed inlet; the driving assembly is mounted on the heat insulation cylinder and is drivingly connected to the cartridge cover to drive the cartridge cover to open or close the feed inlet.

[0014] Preferably, a heat insulation plate is provided at the connection between the heat insulation cylinder and the driving assembly.

[0015] Preferably, the driving assembly includes a connection seat, a knob, a screw rod and a guide post; the connection seat is mounted on the heat insulation cylinder, specifically, it can be mounted on the heat insulation plate, and an activity cavity is provided inside the connection seat, and a guide groove is opened on the side wall of the activity cavity; the screw rod is arranged in the activity cavity and fixedly connects the cartridge cover; the guide post is mounted on the side wall of the screw rod and is in sliding fit with the guide groove; the knob is rotatably mounted on the connection seat and is threadedly connected to the screw rod; rotating the knob can drive the screw rod to move along the guide groove to drive the cartridge cover to open or close the feed inlet.

[0016] Preferably, a sealing treatment is performed between the cartridge cover and the feed inlet, and an air hole communicating the material cavity is provided on the cartridge cover, and an air passage communicating the outside and the air hole is provided inside the screw rod.

[0017] Preferably, a valve nozzle is also installed on the liquid box, and the valve nozzle is located at the connection between the barrel and the liquid box, and a through groove is provided inside the valve nozzle, 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, and the core section of the valve core extends into the through groove, and a through hole is provided on the core section of the valve core, and rotating the valve core can drive the through hole to stagger or align with the through groove to block or open the through groove.

[0018] Preferably, the flow channel is L-shaped and is divided into a vertical section and a horizontal section, the valve nozzle is arranged at the head end of the vertical section of the flow channel, the nozzle is arranged at the end of the horizontal section of the flow channel, and the first heating element and the first temperature sensor are correspondingly arranged beside the horizontal section of the flow channel.

[0019] Preferably, the first heating element and the second heating element are both electric heating rods, and the first temperature sensor and the second temperature sensor are both thermocouples.

[0020] A hot melt adhesive dispensing control system comprises the hot melt adhesive dispensing device and a control unit, wherein the control unit 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, a first temperature sensor and the second temperature sensor are electrically connected; wherein the power module can be externally connected to a power supply; 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, and the AD solid-state relay controls the first heating element to heat so that the inside of the material cavity reaches the first temperature, and 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 a temperature signal to the DD solid-state relay, and the DD solid-state relay controls the second heating element to heat so that the inside of the flow channel reaches the first temperature, and the second temperature sensor is used to transmit the monitored temperature signal to the second temperature controller to form a closed loop.

[0021] Preferably, the second temperature controller may also be pre-set to a second temperature, the second temperature being greater than the first temperature.

[0022] (III) Beneficial effects A hot melt adhesive dispensing device and control system provided by the present invention respectively set a first heating element on the barrel and a second heating element on the liquid box, so that both the material cavity and the flow channel can be heated. By respectively setting a first temperature sensor on the barrel and a second temperature sensor on the liquid box, the temperatures of the material cavity and the flow channel can be monitored. The above structures are used in combination, which is convenient for 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 flowing process, ensuring that the properties of the hot melt adhesive fluid always remain stable, avoiding changes in the properties of the hot melt adhesive fluid, and improving the dispensing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 shows the overall structural schematic diagram of the present invention Figure 1 ; Figure 2 shows Figure 1 the bottom view of Figure 3 shows Figure 2 the A-A cross-sectional view of Figure 4 shows Figure 2 the B-B cross-sectional view of Figure 5 shows the overall structural schematic diagram of the present invention Figure 2 ; Figure 6 shows the structural schematic diagram of the liquid box and the nozzle of the present invention; Figure 7 shows Figure 6 the front view of Figure 8 shows Figure 7 the C-C cross-sectional view of Figure 9 shows Figure 6 the exploded view of Figure 10 shows the partial structural schematic diagram of the present invention; Figure 11 shows Figure 10 the front view of Figure 12 shows Figure 11 the D-D cross-sectional view of Figure 13 shows Figure 10 the exploded schematic diagram of Figure 1 ; Figure 14 shows Figure 10 the exploded schematic diagram ofFigure 2 ; Figure 15 Shows a schematic structural diagram of the control unit of the present invention.

[0024] In the figure: 1 barrel, 10 material cavities, 101 feed ports, 11 barrel covers, 110 air holes, 111 conical sealing rings, 12 first terminal blocks, 2 liquid boxes, 20 flow channels, 21 nozzles, 22 pneumatic valves, 23 mounting seats, 24 second terminal blocks, 3 heating assemblies, 31 first heating elements, 32 second heating elements, 4 monitoring assemblies, 41 first temperature sensors, 42 second temperature sensors, 5 fastening assemblies, 51 fixing seats, 510 fixing clips, 52 inner cylinders, 53 heat insulation cylinders, 530 heat insulation plates, 6 drive assemblies, 61 connecting seats, 610 movable cavities, 611 guide grooves, 62 knobs, 63 screws, 630 air channels, 64 guide posts, 7 valve nozzles, 70 through grooves, 71 valve cores, 710 through holes. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present application. The connection relationships shown in the drawings are only for clear description and do not limit the connection methods.

[0026] 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 intermediate components at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. It should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations. The terms used in the description of this application in this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] Refer to the attached Figure 1 - attached Figure 14, A hot melt adhesive dispensing device, comprising a barrel 1, a liquid box 2, a heating assembly 3 and a monitoring assembly 4; a material cavity 10 for loading hot melt adhesive fluid is provided inside the barrel 1; the liquid box 2 is installed on the barrel 1 and is provided with a nozzle 21 and a pneumatic valve 22, and a flow channel 20 communicating the material cavity 10 and the nozzle 21 is provided inside the liquid box 2, and the pneumatic valve 22 is used to extrude 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 installed on the barrel 1 and is used to heat the material cavity 10, and the second heating element 32 is installed on the liquid box 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 installed on the barrel 1 and is used to monitor the internal temperature of the material cavity 10, and the second temperature sensor 42 is installed on the liquid box 2 and is used to monitor the internal temperature of the flow channel 20.

[0028] Specifically, during use, the first heating element 31 is started to heat the hot melt adhesive fluid in the material cavity 10, and the first temperature sensor 41 is used to monitor the current temperature of the material cavity 10, facilitating the user to control the actual heating temperature of the hot melt adhesive fluid within a suitable range; meanwhile, the second heating element 32 is started to heat the flow channel 20. After the hot melt adhesive fluid in the material cavity 10 enters the flow channel 20, the current temperature of the flow channel 20 is detected and monitored by the second temperature sensor 42. If the temperature of the flow channel 20 detected by the second temperature sensor 42 is inconsistent with the temperature of the material cavity 10, the power of the second heating element 32 is increased to continue heating until the temperature of the flow channel 20 is the same as the temperature of the material cavity 10. Then, the pneumatic valve 22 is started to extrude the hot melt adhesive fluid in the flow channel 20 to the nozzle, and it overflows from the nozzle for dispensing operation.

[0029] In summary, by separately providing the first heating element 31 and the second heating element 32 on the barrel 1 and the liquid box 2 of the present invention, the material cavity 10 and the flow channel 20 can both be heated. By separately providing the first temperature sensor 41 and the second temperature sensor 42 on the barrel 1 and the liquid box 2, the temperatures of the material cavity 10 and the flow channel 20 can be monitored. The above design has a simple structure, is reliable and convenient to use, and facilitates the user to control the temperature of the hot melt adhesive fluid entering the flow channel 20 from the material cavity 10, enabling the hot melt adhesive fluid to maintain a constant temperature during the flowing process, ensuring that the properties of the hot melt adhesive fluid always remain stable, so as to avoid changes in the properties of the hot melt adhesive fluid and improve the dispensing effect.

[0030] It should be noted that before use, the user can put the hot melt adhesive strip or directly put the hot melt adhesive fluid into the material cavity 10. If the hot melt adhesive strip is placed in the material cavity 10, the hot melt adhesive strip needs to be melted into the 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 extrusion of the hot melt adhesive in the flow channel 20 to the nozzle 21 for dispensing belongs to the prior art. Therefore, the specific structure of the air pressure valve 22 and the way of extruding the hot melt adhesive are not elaborated in detail in the present invention.

[0031] Refer to the attached Figure 6 - attached Figure 9 , a mounting seat 23 is detachably provided on the liquid box 2, and the second heating element 32 and the second temperature sensor 42 are both arranged on the mounting seat 23 and correspond to the flow channel 20. This design enables the second heating element 32 and the second temperature sensor 42 to be stably arranged beside the flow channel 20.

[0032] Refer to the attached Figure 9 - attached Figure 14 , a first wiring seat 12 is installed on the cartridge 1. The first wiring seat 12 is electrically connected to the first heating element 31 and the first temperature sensor 41, and the first wiring seat 12 is used for external power supply; a second wiring seat 24 is installed on the liquid box 2. The second wiring seat 24 is electrically connected to the second heating element 32 and the second temperature sensor 42, and the second wiring seat 24 is used for external power supply.

[0033] Refer to the attached Figure 1 - attached Figure 5 and attached Figure 10 - attached Figure 14 , the present invention further includes a fastening assembly 5. The fastening assembly 5 includes a fixed seat 51, an inner cylinder 52 and a heat insulation cylinder 53. The inner cylinder 52 sleeves the cartridge 1, and 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 fixed seat 51 and sleeves the inner cylinder 52.

[0034] Specifically, the design of the inner cylinder 52 can provide an installation space for the first heating element 31 and the first temperature sensor 41, facilitating the stable arrangement of the first heating element 31 and the first temperature sensor 41 beside the cartridge 1; the design of the heat insulation cylinder 53 can prevent heat dissipation and avoid injury to the user due to accidental contact; while the design of the fixed seat 51 facilitates the user to install the present dispensing device on an automated device such as a manipulator (not shown in the figure) for use, improving the usability.

[0035] Furthermore, the fixed seat 51 is also fixedly connected to the air pressure valve 22. This design can improve the installation stability of the air pressure valve 22 and the liquid box 2, avoid the vibration of the liquid box 2 caused by the air pressure valve 22 during operation, and ensure stable dispensing of the nozzle on the liquid box 2.

[0036] Refer to the attached Figure 1-Appendix Figure 5 There are various installation methods between the fixed seat 51 and the heat insulation cylinder 53, which are not limited in the present invention. For the convenience of installation and disassembly, the fixed seat 51 in this embodiment clamps the heat insulation cylinder 53 through a fixing clip 510. Among them, 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 elaborated in detail here.

[0037] Refer to the appendix Figure 1 -Appendix Figure 5 The present invention further includes a driving assembly 6. One end of the cartridge 1 away from the liquid box 2 is provided with a feed port 101 for connecting the material cavity 10 and the outside, and a cartridge cover 11 is provided at the feed port 101 of the cartridge 1. The driving assembly 6 is installed on the heat insulation cylinder 53 and is drivingly connected to the cartridge cover 11 to drive the cartridge cover 11 to open or close the feed port 101. This structural design facilitates the user to open and close the feed port 101 without contacting the heat insulation cylinder 53 to supplement the hot melt adhesive strip or the hot melt adhesive fluid, improving the operation safety.

[0038] Refer to the appendix Figure 1 -Appendix Figure 5 An insulating plate 530 can also be provided at the connection between the heat insulation cylinder 53 and the driving assembly 6. The design of the insulating plate 530 can prevent the components near the feed port 101 from being heated by heat conduction due to high temperature, resulting in difficult feeding. At the same time, it can also prevent the sealing performance between the cartridge cover 11 and the feed port 101 from being damaged, extending the overall service life.

[0039] Refer to the appendix Figure 1 -Appendix Figure 5 and the appendix Figure 10 -Appendix Figure 14 The driving assembly 6 includes a connection seat 61, a knob 62, a screw 63 and a guide post 64. The connection seat 61 is installed on the heat insulation cylinder 53, specifically on the insulating plate 530. The connection seat 61 is internally provided with a movable cavity 610, and a guide groove 611 is opened on the side wall of the movable cavity 610. The screw 63 is arranged in the movable cavity 610 and is fixedly connected to the cartridge cover 11. The guide post 64 is installed on the side wall of the screw 63 and is slidably matched with the guide groove 611. The knob 62 is rotatably installed on the connection seat 61 and is threadedly connected to the screw 63. Rotating the knob 62 can drive the screw 63 to move along the guide groove 611 to drive the cartridge cover 11 to open or close the feed port 101.

[0040] Specifically, when hot melt adhesive needs to be replenished, reverse-rotate the knob 62 to drive the screw 63. Under the restrictive action of the guide post 64 and the guide groove 611, the screw 63 moves upward along the guide groove 611 to drive the cylinder cover 11 to open the feed port 101. After the hot melt adhesive is replenished, forward-rotate the knob 62 to drive the screw 63. Under the restrictive action of the guide post 64 and the guide groove 611, the screw 63 moves downward along the guide groove 611 to drive the cylinder cover 11 to close the feed port 101. This structural design enables the cylinder cover 11 to open or close the feed port 101 by means of vertical translation, avoiding rotational friction between the cylinder cover 11 and the barrel 1, prolonging the service life, and facilitating sealing between the two at the same time.

[0041] It should be noted that in addition to the above structure, the driving assembly 6 can also adopt other manual driving components, or directly adopt electric components such as a lead screw motor or an electric cylinder with a moving stroke (not shown in the figure). Since there are various related structures, no restrictions are imposed on this in the present invention.

[0042] Refer to the appendix Figure 1 - appendix Figure 5 and appendix Figure 10 - appendix Figure 13 , a sealing treatment is performed between the cylinder cover 11 and the feed port 101, and an air hole 110 communicating with the material cavity 10 is provided on the cylinder cover 11. An air passage 630 communicating with the outside and the air hole 110 is provided inside the screw 63.

[0043] Among them, a conical sealing ring 111 can be installed on the cylinder cover 11. When the cylinder cover 11 closes the feed port 101, the conical sealing ring 111 abuts against the inner wall of the barrel 1 to achieve sealing. Other methods can also be used to achieve sealing. Since there are various sealing treatment methods between the cylinder cover 11 and the feed port 101, no restrictions are imposed on this in the present invention. The design of the air hole 110 and the air passage 630 enables the material cavity 10 to communicate with an external air supply device (not shown in the figure), facilitating the extrusion of the hot melt adhesive fluid in the material cavity 10 into the flow channel 20 by using air pressure.

[0044] Refer to the appendix Figure 3 - appendix Figure 9The existing hot melt adhesive dispensing device has the problem of glue leakage. The reason is that after the hot melt adhesive in the barrel 1 is used, a small amount of hot melt adhesive fluid remains in the material cavity 10. During the process of changing materials or replacing the barrel 1, the residual hot melt adhesive fluid will fall into the flow channel 20 and pollute the internal structure, causing inconvenience to the subsequent cleaning and use. To solve this problem, a valve nozzle 7 is also installed on the liquid box 2 in the present invention. The valve nozzle 7 is located at the connection between the barrel 1 and the liquid box 2, and a through groove 70 is provided inside the valve nozzle 7. The flow channel 20 is connected to the material cavity 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 penetrates into the through groove 70, and a through hole 710 is provided on the core section of the valve core 71. Rotating the valve core 71 can drive the through hole 710 to stagger or align with the through groove 70 to block or open the through groove 70.

[0045] Specifically, when it is necessary to change materials or replace the barrel 1, the valve core 71 is rotated to drive the through hole 710 to offset the through groove 70, so that the core section of the valve core 71 blocks the through groove 70 to prevent residual hot melt adhesive fluid from entering the flow channel 20; when dispensing operation is required, first 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.

[0046] Therefore, the combined use of the valve nozzle 7 and the valve core 71 can cut off the connection between the material chamber 10 and the flow channel 20 when necessary, thereby facilitating the maintenance of the cleanliness of the inside of the flow channel 20; in addition, this design can also prevent the hot melt adhesive fluid in the material chamber 10 that does not meet the temperature standard from directly entering the flow channel 20, thereby ensuring the dispensing effect.

[0047] See attached Figure 3 -Attached Figure 9 The flow channel 20 is L-shaped and is divided into a vertical section and a horizontal section. The valve nozzle 7 is arranged at the head end of the vertical section of the flow channel 20, the nozzle 21 is arranged at the end of the horizontal section of the flow channel 20, and the first heating element 31 and the first temperature sensor 41 are correspondingly arranged on the side of the horizontal section of the flow channel 20.

[0048] 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 design of the horizontal section of the flow channel 20 allows the hot melt adhesive fluid entering it to remain horizontal, which facilitates the second heating element 32 to heat the hot melt adhesive fluid for a long time and also facilitates the second temperature sensor 42 to more accurately monitor the temperature of the hot melt adhesive fluid.

[0049] See attached Figure 9 -Attached Figure 13, the 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 the present invention does not limit this; for the convenience of understanding, in this embodiment, both the first heating element 31 and the second heating element 32 are electric heating rods, and both the first temperature sensor 41 and the second temperature sensor 42 are thermocouples.

[0050] Among them, the electric heating rod starts heating when powered on and heats according to the magnitude of the current, which is 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, small inertia, and the output signal is convenient for remote transmission.

[0051] Refer to the appendix Figure 1 - appendix Figure 15 , a hot melt adhesive dispensing control system, including a hot melt adhesive dispensing device and a control unit. The control unit includes a power supply module, a first temperature controller, an AD solid-state relay, a second temperature controller and a DD solid-state relay; the power supply module, the first temperature controller, the AD solid-state relay, the second temperature controller, the DD solid-state relay, the first heating element 31, the second heating element 32, the first temperature sensor 41 and the second temperature sensor 42 are electrically connected; among them, the power supply module can be externally connected to a power supply; 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 31 to heat, so that the inside of the material cavity 10 reaches the first temperature, and 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 the temperature signal to the DD solid-state relay, and the DD solid-state relay controls the second heating element 32 to heat, so that the inside of the flow channel 20 reaches the first temperature, and the second temperature sensor 42 is used to transmit the monitored temperature signal to the second temperature controller to form a closed loop.

[0052] Specifically, the cooperation of the control unit with the hot melt adhesive dispensing device can simplify and automate the temperature control of the material cavity 10 and the flow channel 20, which is convenient for keeping the hot melt adhesive fluid in a constant temperature state for dispensing operations.

[0053] For the convenience of understanding, the specific use steps of the hot melt adhesive dispensing control system in this embodiment are as follows: S1. Connect the power supply module to an external power supply to maintain normal power supply; S2. After placing the cartridge 1 into the hot melt adhesive stick, set the first temperature through the first temperature controller. The first temperature controller transmits the temperature signal to the AD relay, and the AD relay controls the first heating element 31 to heat the material chamber 10 to the first temperature to melt the hot melt adhesive stick into a hot melt adhesive fluid. When the first temperature sensor 41 monitors that the temperature of the hot melt adhesive fluid in the material chamber 10 reaches the first temperature, it transmits the data to the first temperature controller to form a heating closed loop for continuous heating. At this time, the hot melt adhesive fluid in the material chamber 10 can be discharged into the flow channel 20; S3. Set the first temperature through the second temperature controller. The second temperature controller transmits the temperature signal to the DD relay, and the DD relay controls the second heating element 32 to heat the flow channel 20 to the first temperature. When the second temperature sensor 42 monitors that the temperature of the hot melt adhesive fluid in the flow channel 20 reaches the first temperature, it transmits the data to the second temperature controller to form a heating closed loop for continuous heating.

[0054] S4. When the first temperature sensor 41 monitors that the temperature of the material chamber 10 is stably maintained at the first temperature and the second temperature sensor 42 monitors 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 extruded to the nozzle 21 for dispensing operation through the pneumatic valve 22, 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.

[0055] It should be noted that in step S4, if the temperature of the hot melt adhesive fluid entering the flow channel 20 drops or rises, resulting in the second temperature sensor 42 monitoring that the temperature of the flow channel 20 is lower or higher than the first temperature, the second temperature controller adjusts the power of the second heating element 32 until the second temperature sensor 42 detects again that the temperature of the flow channel 20 remains at the first temperature, and then the dispensing operation is carried out.

[0056] Refer to the appendix Figure 1 - appendix Figure 8 , two first heating elements 31 can be provided to surround the cartridge 1, and both two first heating elements 31 are signal-connected to the first temperature controller; this design enables the material chamber 10 to be heated faster and improves the working efficiency.

[0057] Refer to the appendix Figure 1 - appendix Figure 8 , the second temperature controller can also pre-set a second temperature, and the second temperature is greater than the first temperature.

[0058] Specifically, before use, preset the second heating element 32 to heat the flow channel 20 to the second temperature through the second thermostat, so as to preheat the flow channel 20 and melt the hot melt adhesive remaining in the flow channel 20. Then, raise the temperature of the material cavity 10 to the first temperature through the first thermostat, so that the hot melt adhesive fluid in the material cavity 10 enters the flow channel 20 and entangles the residual adhesive to be discharged from the nozzle 21. After the residual adhesive in the flow channel 20 is drained, continue to discharge the hot melt adhesive fluid in the material cavity 10 into the flow channel 20, and control the power of the second heating element 32 through the second thermostat to adjust the flow channel 20 to the first temperature, and then the dispensing operation can be carried out.

[0059] Therefore, presetting the second temperature to be higher than the first temperature is beneficial to cleaning the residual hot melt adhesive in the flow channel 20 and can quickly compensate for the part of the heat loss when the hot melt adhesive fluid enters the flow channel 20, so that the second thermostat 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.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hot melt adhesive dispensing device, characterized in that: include: A barrel, wherein a chamber for loading hot melt adhesive fluid is provided inside the barrel; A liquid box, the liquid box is mounted on the barrel and has a nozzle and an air pressure valve, and a flow channel connecting the material cavity and the nozzle is provided inside the liquid box, and the air pressure valve is used to squeeze the hot melt adhesive fluid in the flow channel to the nozzle; A heating assembly, the heating assembly comprising a first heating element and a second heating element, the first heating element being mounted on the barrel and used to heat the material cavity, the second heating element being mounted on the liquid box and used to heat the flow channel; A monitoring component, the monitoring component includes a first temperature sensor and a second temperature sensor, the first temperature sensor is installed on the barrel and is used to monitor the internal temperature of the material cavity, and the second temperature sensor is installed on the liquid box and is used to monitor the internal temperature of the flow channel.

2. A hot melt adhesive dispensing device according to claim 1, characterized in that: It also includes a fastening assembly, which includes a fixing seat, an inner cylinder and an insulating cylinder. The inner cylinder is sleeved with the barrel, and the first heating element and the first temperature sensor are both installed on the inner cylinder; the insulating cylinder is installed on the fixing seat and sleeved with the inner cylinder.

3. A hot melt adhesive dispensing device according to claim 2, characterized in that: It also includes a driving component, and a feed port connecting the material cavity and the outside is provided at one end of the material barrel away from the liquid box, and the material barrel is provided with a barrel cover at the feed port; the driving component is installed on the insulating barrel and is drivingly connected to the barrel cover to drive the barrel cover to open or close the feed port.

4. A hot melt adhesive dispensing device according to claim 3, characterized in that: The driving assembly includes a connecting seat, a knob, a screw and a guide column; the connecting seat is installed on the insulating cylinder, and a movable cavity is provided inside the connecting seat, and a guide groove is opened on the side wall of the movable cavity; the screw is arranged in the movable cavity and fixedly connected to the cylinder cover; the guide column is installed on the side wall of the screw and slidingly cooperates with the guide groove; the knob is rotatably installed on the connecting seat and is threadedly connected to the screw; rotating the knob can drive the screw to move along the guide groove to drive the cylinder cover to open or close the feed port.

5. A hot melt adhesive dispensing device according to claim 4, characterized in that: The barrel cover and the feed port are sealed, and the barrel cover is provided with an air hole connected to the material cavity, and the screw is provided with an air channel connecting the outside and the air hole.

6. A hot melt adhesive dispensing device according to claim 1, characterized in that: A valve nozzle is also installed on the liquid box, and the valve nozzle is located at the connection between the barrel and the liquid box, and a through groove is provided inside the valve nozzle, 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, and the core section of the valve core penetrates into the through groove, and a through hole is provided on the core section of the valve core, and rotating the valve core can drive the through hole to stagger or align with the through groove, so as to block or open the through groove.

7. A hot melt adhesive dispensing device according to claim 6, characterized in that: The flow channel is L-shaped and is divided into a vertical section and a horizontal section. The valve mouth is arranged at the head end of the vertical section of the flow channel, the nozzle is arranged at the end of the horizontal section of the flow channel, and the first heating element and the first temperature sensor are correspondingly arranged beside the horizontal section of the flow channel.

8. A hot melt adhesive dispensing device according to claim 1, characterized in that: The first heating element and the second heating element are both electric heating rods, and the first temperature sensor and the second temperature sensor are both thermocouples.

9. A hot melt adhesive dispensing control system, comprising a hot melt adhesive dispensing device according to any one of claims 1 to 8, characterized in that: It also includes a control unit, the control unit includes a power module, a first thermostat, an AD solid-state relay, a second thermostat, and a DD solid-state relay; the power module, the first thermostat, the AD solid-state relay, the second thermostat, 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; Among them, the power module can be connected to an external power supply; the first temperature controller and the second temperature controller can synchronously set 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 cavity reaches the first temperature, and 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, and the second temperature sensor is used to transmit the monitored temperature signal to the second temperature controller to form a closure.

10. A hot melt adhesive dispensing control system according to claim 8, characterized in that: The second temperature controller may also be pre-set to a second temperature, which is greater than the first temperature.

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