Electromagnetic direct-acting adhesive spray valve for high-viscosity fluids

Abstract

This invention discloses an electromagnetic direct-acting adhesive spray valve for high-viscosity fluids, comprising a main magnetic circuit assembly, a valve core assembly, and a secondary magnetic circuit assembly assembled as one unit. The valve core assembly includes a main magnetic circuit moving iron, a magnetic shielding sleeve, a secondary magnetic circuit moving iron, and a valve seat, all assembled as one unit and arranged from top to bottom. The secondary magnetic circuit assembly includes a secondary magnetic circuit fixed iron core and a secondary magnetic circuit frameless coil sleeved outside the fixed iron core. The fixed iron core is located below the moving iron; when the frameless coil is energized, the moving iron moves closer to the fixed iron core. The invention also includes a valve insert, which is press-fitted between the valve seat and the fixed iron core. After the invention is press-fitted onto the mating valve block, a heated adhesive storage cavity communicating with the fluid channel is formed between the valve insert and the valve block. This invention features a compact and stable structure, is less prone to valve port clogging, has an easily replaceable valve core, good sealing performance, and a fast response speed, making it suitable as an actuator in automated adhesive application systems for efficient adhesive application.

Description

Technical Field

[0001] This invention belongs to the field of valve element technology, and specifically relates to an electromagnetic direct-acting adhesive spray valve for high-viscosity fluids. Background Technology

[0002] An electromagnetic direct-acting adhesive spray valve is a specific type of electromagnetic valve, typically used in conjunction with a valve block having a fluid passage and a nozzle. It utilizes electromagnetic principles to control the spraying of adhesives. Existing electromagnetic direct-acting adhesive spray valves generally include a valve body for housing other components, a valve core for opening or closing the fluid passage on the valve block, an electromagnetic coil for driving the valve core to open the fluid passage, and a spring for resetting the valve core to close the fluid passage when the electromagnetic coil is de-energized.

[0003] Electromagnetic direct-acting adhesive spray valves play a vital role in the adhesive coating industry, widely used in construction materials, automotive and parts manufacturing, electronics and information technology, medical devices, and footwear manufacturing. However, with continuous innovation in adhesive coating technology in recent years, higher viscosity adhesives are increasingly being used in the industry. The aforementioned electromagnetic direct-acting adhesive spray valve structure can no longer meet the demands of this sector, specifically in the following ways:

[0004] Firstly, high-viscosity adhesives have poor flowability. When using the existing electromagnetic direct-acting spray valve for spraying, the adhesive application consistency is poor, and it is also easy to cause blockage of the valve port.

[0005] Secondly, high-viscosity adhesives require significant pressure for effective flow and spraying due to their molecular structure and flow characteristics. Existing electromagnetic direct-acting spray valves rely solely on spring force to reset the valve core and close the fluid passage. The resulting sealing pressure after closure is relatively low, making leakage a likely problem.

[0006] Thirdly, the existing electromagnetic direct-acting glue spray valves typically have a solid valve core, which causes significant impact on other components with each operation, easily leading to deformation and damage to the valve core or other parts. Summary of the Invention

[0007] This invention provides an electromagnetic direct-acting adhesive spray valve for high-viscosity fluids, which aims to achieve consistent and efficient adhesive application for high-viscosity adhesives, while solving the problems of easy clogging of the valve port, poor sealing, and weak impact resistance.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electromagnetic direct-acting adhesive spray valve for high-viscosity fluids, comprising a main magnetic circuit assembly, a valve core assembly, and a secondary magnetic circuit assembly assembled together;

[0009] The main magnetic circuit assembly includes a main magnetic circuit stator core, a main magnetic circuit coil frame sleeved outside the main magnetic circuit stator core, and a main magnetic circuit coil wound on the main magnetic circuit coil frame.

[0010] The valve core assembly includes a main magnetic circuit moving iron, a magnetic shielding sleeve, a secondary magnetic circuit moving iron, and a valve seat, all assembled together and arranged from top to bottom. It also includes a counterweight in the magnetic shielding sleeve and a metal ball pressed into the valve seat. The main magnetic circuit moving iron is located below the main magnetic circuit fixed iron core. When the main magnetic circuit coil is energized, the main magnetic circuit moving iron moves closer to the main magnetic circuit fixed iron core.

[0011] The secondary magnetic circuit assembly includes a secondary magnetic circuit fixed iron core and a secondary magnetic circuit frameless coil sleeved outside the secondary magnetic circuit fixed iron core; the secondary magnetic circuit fixed iron core is located below the secondary magnetic circuit moving iron, and when the secondary magnetic circuit frameless coil is energized, the secondary magnetic circuit moving iron moves closer to the secondary magnetic circuit fixed iron core.

[0012] It also includes a magnetic shielding tube and a valve insert; the magnetic shielding tube is disposed outside the main magnetic circuit fixed iron core, the valve core assembly and the secondary magnetic circuit fixed iron core; the valve insert is press-fitted between the valve seat and the secondary magnetic circuit fixed iron core;

[0013] After the electromagnetic direct-acting glue spray valve is press-fitted onto the valve block that it is paired with, a heated glue storage chamber that communicates with the fluid channel is formed between the valve insert and the valve block.

[0014] As a limitation of the present invention, the counterweight includes a plurality of steel sheets stacked in the magnetic shielding sleeve.

[0015] As another limitation of the present invention, the valve core assembly further includes a double-ended stud that passes through the main magnetic circuit moving iron, the counterweight, and the secondary magnetic circuit moving iron; the top of the double-ended stud is connected to a locking nut, and the bottom is connected to the valve seat.

[0016] As a further limitation of the present invention, the main magnetic circuit assembly also includes a main magnetic circuit coil housing sleeved on the upper part of the magnetic shielding tube, the main magnetic circuit coil housing covering the outside of the main magnetic circuit coil frame and the main magnetic circuit coil.

[0017] As a further limitation of the present invention, the secondary magnetic circuit assembly also includes a secondary magnetic circuit coil housing sleeved on the lower part of the magnetic shielding tube, the secondary magnetic circuit coil housing covering the outside of the secondary magnetic circuit frameless coil.

[0018] As a third limitation of the present invention, it also includes a preload spring assembled between the main magnetic circuit fixed iron core and the main magnetic circuit moving iron. When the main magnetic circuit coil is de-energized, the preload spring is used to push the valve core assembly back to the initial position to close the fluid passage.

[0019] As a further limitation of the present invention, a sealing ring is provided between the valve insert and the valve seat.

[0020] As a further limitation of the present invention, the valve insert is provided with an annular temperature sensor.

[0021] As a further limitation of the present invention, the valve insert is made of brass alloy.

[0022] By adopting the above-described technical solution, the beneficial effects achieved by this invention compared to the prior art are as follows:

[0023] (1) This invention achieves dual magnetic circuit control of the valve core assembly by adding a secondary magnetic circuit component at the valve port. The primary magnetic circuit component drives the valve core assembly to move and open the fluid channel, while the secondary magnetic circuit component drives the valve core assembly to reset and close the fluid channel. The dual magnetic circuit control method solves the problem that the valve body sealing force is limited by the size of the preload spring in the prior art. This invention can provide a greater sealing force when closing the fluid channel, thereby effectively preventing leakage. In addition, the heat generated by the secondary magnetic circuit component after power-on will also heat the valve insert to heat and keep the high-viscosity fluid flowing into the heating and storage chamber, thereby reducing the viscosity of the high-viscosity fluid, reducing the required spraying pressure, and thus enabling more precise control of the amount of adhesive sprayed, resulting in higher adhesive consistency. It also solves the problem of easy clogging of the valve port.

[0024] The following explanation addresses the statement that "the sealing force of the valve body is limited by the size of the preload spring": In existing technologies, the valve core is reset only by the preload spring. The valve body sealing force equals the weight of the valve core plus the spring force. Since the weight of the valve core is constant, the size of the spring is limited by the size of the valve body and cannot be changed. The sealing force of the valve body can only be improved by changing the spring stiffness within a limited range. Therefore, the sealing force of the valve body in the existing structure is limited by the size of the preload spring.

[0025] (2) The counterweight in the valve core assembly of the present invention is composed of multiple stacked steel plates. When the valve core assembly operates, the inertia of the steel plates effectively reduces the impact on other components, thereby preventing deformation and damage to the valve core or other components. In addition, compared with the solid structure of the valve core in the prior art, the stacked plate structure adopted in the present invention can reduce the mass of the valve core to a certain extent, thereby improving the valve core response speed and facilitating efficient spraying during the production process.

[0026] (3) In the valve core assembly of the present invention, the main magnetic circuit moving iron, the magnetic shielding sleeve, and the secondary magnetic circuit moving iron are assembled into one piece by double-ended studs. The two ends of the double-ended studs are respectively limited by locking nuts and valve seats, making the valve core structure easy to disassemble and assemble, and thus making it easier to replace vulnerable parts.

[0027] (4) The preload spring provided in this invention is used to provide a certain valve core return force, which works with the secondary magnetic circuit assembly in the energized state to control the valve core assembly to return. The preload spring works with the secondary magnetic circuit assembly to provide a greater sealing force when the fluid channel is closed. On the other hand, it is used to provide a certain sealing force to keep the fluid channel closed in the de-energized state.

[0028] (5) The valve insert in this invention is made of brass alloy, which has better thermal conductivity.

[0029] In summary, the present invention has a compact and stable structure, the valve port is not easily blocked, the valve core is easy to disassemble and replace, the sealing performance is good, and the response speed is fast, making it suitable as an actuator of an automated glue application system for efficient glue application. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of the valve block after it is press-fitted into the valve block according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the split structure according to an embodiment of the present invention;

[0033] Figure 3 This is a longitudinal sectional view of the structural relationship of the valve block after it is press-fitted into the valve block according to an embodiment of the present invention;

[0034] Figure 4 This is a longitudinal sectional view of the structural relationship of the main magnetic circuit assembly in an embodiment of the present invention;

[0035] Figure 5 This is a longitudinal sectional view of the structural relationship of the valve core assembly in an embodiment of the present invention;

[0036] Figure 6 This is a longitudinal sectional view of the structural relationship of the secondary magnetic circuit assembly in an embodiment of the present invention;

[0037] In the diagram: 1. Main magnetic circuit assembly; 2. Valve core assembly; 3. Secondary magnetic circuit assembly; 4. Magnetic shielding tube; 5. Valve insert; 6. Preload spring; 7. Valve block; 8. Heating storage chamber; 9. Sealing ring; 10. Annular temperature sensor;

[0038] 101. Main magnetic circuit stator core; 102. Main magnetic circuit coil frame; 103. Main magnetic circuit coil; 104. Main magnetic circuit coil housing; 105. Fastening screws; 106. Mounting slot;

[0039] 201. Main magnetic circuit moving iron; 202. Magnetic shielding sleeve; 203. Secondary magnetic circuit moving iron; 204. Valve seat; 205. Metal ball; 206. Steel sheet; 207. Double-ended stud; 208. Locking nut; 209. Main air gap of magnetic circuit;

[0040] 301. Secondary magnetic circuit stator core; 302. Secondary magnetic circuit frameless coil; 303. Secondary magnetic circuit coil outer shell. Detailed Implementation

[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and understanding purposes only and are not intended to limit the scope of the invention.

[0042] This embodiment discloses an electromagnetic direct-acting adhesive spray valve for high-viscosity fluids, such as... Figures 1 to 3 As shown, this embodiment includes a magnetic shielding tube 4 and a main magnetic circuit assembly 1, a valve core assembly 2, and a secondary magnetic circuit assembly 3 assembled on the magnetic shielding tube 4. It also includes a valve insert 5 press-fitted at the valve port and a preload spring 6 assembled between the main magnetic circuit assembly 1 and the valve core assembly 2. This embodiment achieves spray control of high-viscosity fluids by press-fitting the valve insert 7, which has a fluid channel and a nozzle, using electromagnetic principles.

[0043] I. Main Magnetic Circuit Assembly 1

[0044] After being powered on, the main magnetic circuit assembly 1 drives the valve core assembly 2 to move upward, thereby opening the fluid passage of the valve block 7. For example... Figure 4 As shown, the main magnetic circuit assembly 1 includes a main magnetic circuit fixed core 101, a main magnetic circuit coil frame 102, a main magnetic circuit coil 103, and a main magnetic circuit coil housing 104. The main magnetic circuit fixed core 101 is made of 1215 steel and is fixed to the top of the magnetic shielding tube 4 by fastening screws 105. A mounting groove 106 for placing a preload spring 6 is provided at the center of the bottom of the main magnetic circuit fixed core 101. The main magnetic circuit coil frame 102 is fitted onto the top of the magnetic shielding tube 4, located outside the main magnetic circuit fixed core 101. The main magnetic circuit coil 103 is wound around the main magnetic circuit coil frame 102, serving as the main magnetic circuit excitation and controlled by PWM (pulse width modulation). The main magnetic circuit coil housing 104 is made of 08F steel, fixed to the top of the magnetic shielding tube 4, and covers the main magnetic circuit coil frame 102 and the main magnetic circuit coil 103, providing protection for the main magnetic circuit coil 103.

[0045] II. Valve Core Assembly 2

[0046] The valve core assembly 2 is located inside the magnetic shielding tube 4 and is responsible for opening or closing the fluid passage on the valve block 7. For example... Figure 5As shown, the valve core assembly 2 includes a main magnetic circuit moving iron 201, a magnetic shielding sleeve 202, a secondary magnetic circuit moving iron 203, a valve seat 204, a metal ball 205, a counterweight, and a double-ended stud 207. The main magnetic circuit moving iron 201, the magnetic shielding sleeve 202, and the secondary magnetic circuit moving iron 203 are arranged from top to bottom, and the three are assembled to form a hollow cylindrical structure. The double-ended stud 207 passes through the main magnetic circuit moving iron 201, the magnetic shielding sleeve 202, and the secondary magnetic circuit moving iron 203, and is located on the central axis. The top of the double-ended stud 207 is connected to a locking nut 208, and the bottom is connected to the valve seat 204. The locking nut and the valve seat 204 form an outer limit, thus controlling the main magnetic circuit moving iron 201. The magnetic circuit moving iron 201, the magnetic shielding sleeve 202, and the secondary magnetic circuit moving iron 203 are assembled into one unit; the counterweight is located inside the magnetic shielding sleeve 202, that is, inside the hollow cylinder formed by the main magnetic circuit moving iron 201, the magnetic shielding sleeve 202, and the secondary magnetic circuit moving iron 203. In this embodiment, the counterweight is composed of multiple stacked annular steel sheets 206, and the through hole in the middle of the steel sheet 206 is used for the double-headed stud 207 to pass through; the metal ball 205 is pressed onto the valve seat 204.

[0047] In this embodiment, the main magnetic circuit moving iron 201 and the secondary magnetic circuit moving iron 203 are made of 1215 steel, the magnetic shielding sleeve 202 is made of 6061 aluminum alloy, the steel sheet 206 is made of 305 stainless steel, the valve seat 204 is made of brass alloy, and the steel ball is made of 40Cr.

[0048] like Figure 3 As shown, the valve core assembly 2 is located below the main magnetic circuit fixed iron core 101 in the main magnetic circuit assembly 1. The gap between the main magnetic circuit fixed iron core 101 and the main magnetic circuit moving iron 201 is the main air gap 209 of the magnetic circuit, which is also the actuation distance of the valve core assembly 2. When the main magnetic circuit coil 103 in the main magnetic circuit assembly 1 is energized, the main magnetic circuit fixed iron core 101 is magnetized, attracting the main magnetic circuit moving iron 201 to approach the main magnetic circuit fixed iron core 101, thereby causing the valve core assembly 2 to move upward as a whole to open the fluid channel of the valve block 7.

[0049] III. Preload Spring 6

[0050] like Figure 3 As shown, the preload spring 6 is assembled between the main magnetic circuit fixed iron core 101 and the main magnetic circuit moving iron 201, and is limited in the mounting groove 106 at the bottom center of the main magnetic circuit fixed iron core 101. It is in a compressed state. When the main magnetic circuit coil 103 is de-energized, the preload spring 6 is used to push the valve core assembly 2 down to the initial position to close the fluid passage of the valve block 7.

[0051] IV. Secondary Magnetic Circuit Component 3

[0052] The secondary magnetic circuit assembly 3 is located at the valve port. After power-on, it applies a downward suction force to the valve core assembly 2, driving the valve core assembly 2 to move back to its original position under the cooperation of the preload spring 6, thereby closing the fluid passage of the valve block 7. Simultaneously, it heats and maintains the temperature of the high-viscosity fluid flowing to the valve port, reducing its viscosity. Figure 6 As shown, the secondary magnetic circuit assembly 3 includes a secondary magnetic circuit fixed iron core 301, a secondary magnetic circuit frameless coil 302, and a secondary magnetic circuit coil housing 303. The secondary magnetic circuit fixed iron core 301 is made of 1215 steel and has an annular sleeve structure, fixed at the bottom inside the magnetic shielding tube 4. The secondary magnetic circuit frameless coil 302 is sleeved at the bottom of the magnetic shielding tube 4, located outside the secondary magnetic circuit fixed iron core 301. In this embodiment, the secondary magnetic circuit frameless coil 302 is controlled by PWM (pulse width modulation), which can compensate for the hysteresis effect when the valve core assembly 2 is engaged, improving the device response speed. The secondary magnetic circuit coil housing 303 is made of 08F steel, fixed at the bottom of the magnetic shielding tube 4, and covers the secondary magnetic circuit frameless coil 302 for protection.

[0053] like Figure 3 As shown, the secondary magnetic circuit fixed iron core 301 is located below the secondary magnetic circuit moving iron 203 in the valve core assembly 2. When the secondary magnetic circuit frameless coil 302 is energized, the secondary magnetic circuit fixed iron core 301 is magnetized, attracting the secondary magnetic circuit moving iron 203 to approach the secondary magnetic circuit fixed iron core 301, thereby causing the valve core assembly 2 to move down as a whole to close the fluid passage of the valve block 7.

[0054] 5. Magnetic shielding tube 4 and valve insert 5

[0055] As described above, the magnetic shielding tube 4 is installed outside the main magnetic circuit fixed iron core 101, the valve core assembly 2 and the secondary magnetic circuit fixed iron core 301. It is made of 305 stainless steel and is used to reduce the hysteresis effect.

[0056] like Figure 3 As shown, the valve insert 5 is press-fitted between the valve seat 204 and the secondary magnetic circuit stator 301. When this embodiment is press-fitted onto the valve block 7, a heated rubber storage cavity 8 communicating with the fluid channel is formed between the valve insert 5 and the valve block 7. In this embodiment, the valve insert 5 is made of brass alloy. To improve sealing performance, a sealing ring 9 is provided between the valve insert 5 and the valve seat 204.

[0057] When the frameless coil 302 of the secondary magnetic circuit is powered on, the heat it generates is transferred to the valve insert 5 through the fixed iron core 301 of the secondary magnetic circuit. Then, the valve insert 5 heats and keeps the high-viscosity fluid flowing into the heating storage chamber 8, thereby reducing the viscosity of the high-viscosity fluid.

[0058] In order to monitor the temperature, an annular temperature sensor 10 is provided on the valve insert 5 in this embodiment.

[0059] When applying adhesive using this embodiment, the flow direction of the high-viscosity fluid is as follows: Figure 3 As shown by the middle arrow, the working process of this embodiment is as follows:

[0060] S1. Glue preparation stage: High-viscosity fluid enters the heating storage chamber 8 through the fluid channel. The frameless coil 302 of the secondary magnetic circuit is energized and PWM control is performed according to the feedback data of the ring temperature sensor 10 to heat the high-viscosity fluid in the heating storage chamber 8. The secondary magnetic circuit fixed iron core 301 attracts the secondary magnetic circuit moving iron 203 to improve the sealing performance of the fluid channel in the closed state, so as to enable the high-pressure delivery of high-viscosity fluid.

[0061] S2, Spraying stage: The secondary magnetic circuit frameless coil 302 is de-energized, the main magnetic circuit coil 103 is energized and controlled by PWM to precisely regulate the electromagnetic force. The main magnetic circuit fixed iron core 101 attracts the main magnetic circuit moving iron 201, so that the valve core assembly 2 overcomes its own gravity and the elastic force of the pre-compression spring 6 and moves upward to open the fluid channel of the valve block 7, so that high viscosity fluid can be sprayed.

[0062] S3, Temporary Cut-off Glue Spraying Stage: The main magnetic circuit coil 103 is de-energized, and the secondary magnetic circuit frameless coil 302 is energized. Through the attraction of the secondary magnetic circuit fixed iron core 301 to the secondary magnetic circuit moving iron 203, and with the cooperation of the pre-compression spring 6, the valve core assembly 2 quickly returns to its original position to quickly close the fluid passage of the valve block 7.

[0063] S4. Equipment shutdown stage: The secondary magnetic circuit frameless coil 302 is energized to keep the high-viscosity fluid in the heating storage chamber 8 warm and provide additional sealing force to prevent leakage. When the temperature of the high-viscosity fluid drops to a certain value, the secondary magnetic circuit frameless coil 302 is de-energized, the high-viscosity fluid is completely solidified, and the pre-compression spring 6 provides a certain sealing force to keep the fluid channel in a closed state.

[0064] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electromagnetic direct-acting adhesive spray valve for high-viscosity fluids, characterized in that: It includes a main magnetic circuit assembly, a valve core assembly, and a secondary magnetic circuit assembly assembled together. The main magnetic circuit assembly includes a main magnetic circuit stator core, a main magnetic circuit coil frame sleeved outside the main magnetic circuit stator core, and a main magnetic circuit coil wound on the main magnetic circuit coil frame. The valve core assembly includes a main magnetic circuit moving iron, a magnetic shielding sleeve, a secondary magnetic circuit moving iron, and a valve seat, all assembled together and arranged from top to bottom. It also includes a counterweight in the magnetic shielding sleeve and a metal ball pressed into the valve seat. The main magnetic circuit moving iron is located below the main magnetic circuit fixed iron core. When the main magnetic circuit coil is energized, the main magnetic circuit moving iron moves closer to the main magnetic circuit fixed iron core. The secondary magnetic circuit assembly includes a secondary magnetic circuit fixed iron core and a secondary magnetic circuit frameless coil sleeved outside the secondary magnetic circuit fixed iron core; the secondary magnetic circuit fixed iron core is located below the secondary magnetic circuit moving iron, and when the secondary magnetic circuit frameless coil is energized, the secondary magnetic circuit moving iron moves closer to the secondary magnetic circuit fixed iron core. It also includes a magnetic shielding tube and a valve insert; the magnetic shielding tube is disposed outside the main magnetic circuit fixed iron core, the valve core assembly and the secondary magnetic circuit fixed iron core; the valve insert is press-fitted between the valve seat and the secondary magnetic circuit fixed iron core; After the electromagnetic direct-acting glue spray valve is press-fitted onto the matching valve block, a heated glue storage cavity is formed between the valve insert and the valve block, which is connected to the fluid channel.

2. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 1, characterized in that: The counterweight consists of multiple steel sheets stacked within the magnetic shielding sleeve.

3. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 1 or 2, characterized in that: The valve core assembly also includes a double-ended stud that passes through the main magnetic circuit moving iron, the counterweight, and the secondary magnetic circuit moving iron; the top of the double-ended stud is connected to a lock nut, and the bottom is connected to the valve seat.

4. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 3, characterized in that: The main magnetic circuit assembly also includes a main magnetic circuit coil housing sleeved on the upper part of the magnetic shielding tube, and the main magnetic circuit coil housing covers the outside of the main magnetic circuit coil frame and the main magnetic circuit coil.

5. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 4, characterized in that: The secondary magnetic circuit assembly also includes a secondary magnetic circuit coil housing fitted under the lower part of the magnetic shielding tube, the secondary magnetic circuit coil housing covering the outside of the secondary magnetic circuit frameless coil.

6. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to any one of claims 1, 2, 4, and 5, characterized in that: It also includes a preload spring assembled between the main magnetic circuit stationary iron core and the main magnetic circuit moving iron core. When the main magnetic circuit coil is de-energized, the preload spring is used to push the valve core assembly back to the initial position to close the fluid passage.

7. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 6, characterized in that: A sealing ring is provided between the valve insert and the valve seat.

8. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 7, characterized in that: The valve insert is equipped with a ring-shaped temperature sensor.

9. The electromagnetic direct-acting adhesive spray valve for high-viscosity fluids according to claim 8, characterized in that: The valve insert is made of brass alloy.

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