Electromagnetic direct-acting type glue spraying valve for high-viscosity fluid

Abstract

The invention discloses an electromagnetic direct-acting type glue spraying valve for high-viscosity fluid. The electromagnetic direct-acting type glue spraying valve comprises a main magnetic circuit assembly, a valve element assembly and a secondary magnetic circuit assembly which are assembled into a whole. The valve element assembly comprises a main magnetic circuit moving iron, a magnetic isolation sleeve, a secondary magnetic circuit moving iron and a valve seat which are assembled into a whole and arranged from top to bottom. The secondary magnetic circuit assembly comprises a secondary magnetic circuit fixed iron core and a secondary magnetic circuit frameless coil arranged outside the secondary magnetic circuit fixed iron core in a sleeving mode. The secondary magnetic circuit fixed iron core is located below the secondary magnetic circuit moving iron, and after the secondary magnetic circuit frameless coil is powered on, the secondary magnetic circuit moving iron gets close to the secondary magnetic circuit fixed iron core; the secondary magnetic circuit structure further comprises a valve insert which is pressed between the valve seat and the secondary magnetic circuit fixed iron core. After the valve insert is pressed on a valve block matched with the valve insert, a heating glue storage cavity communicated with the fluid channel is formed between the valve insert and the valve block. The actuating mechanism is compact and stable in structure, the valve port is not prone to being blocked, the valve element is easy to disassemble and replace, the sealing performance is good, the response speed is high, and the actuating mechanism is suitable for efficient gluing operation as an actuating mechanism of an automatic gluing system.

Description

Technical Field

[0001] The invention belongs to the technical field of valve elements, and in particular relates to an electromagnetic direct-acting glue spraying valve for high-viscosity fluids. Background Art

[0002] The electromagnetic direct-acting glue spraying valve is a specific type of electromagnetic valve, which is usually matched with a valve block with a fluid channel and a nozzle, and uses the electromagnetic principle to realize the spraying control of the adhesive. The existing electromagnetic direct-acting glue spraying valve generally includes a valve body for accommodating other components, a valve core for opening or closing the fluid channel on the valve block, an electromagnetic coil for driving the valve core to move to open the fluid channel, and a spring for resetting the valve core to close the fluid channel when the electromagnetic coil is powered off.

[0003] Electromagnetic direct-acting glue spray valves play an important role in the glue coating industry and are widely used in the fields of construction and building materials, automobile and parts manufacturing, electronic information, medical equipment, and footwear manufacturing. However, with the continuous innovation of glue coating technology in recent years, adhesives with higher viscosity have been continuously applied to the glue coating industry. The above-mentioned electromagnetic direct-acting glue spray valve structure can no longer meet the use needs of the glue coating industry, which is specifically manifested in: First, high-viscosity adhesives have poor fluidity. When using the existing electromagnetic direct-acting spray valve for spraying, the glue coating consistency is poor and it is also easy to cause valve port blockage; Second, due to its molecular structure and flow characteristics, high-viscosity adhesives require greater pressure to flow and spray effectively. The existing electromagnetic direct-acting glue spray valve only uses the spring force to reset the valve core to close the fluid channel. The sealing pressure formed after closing is relatively small, which is prone to leakage; Third, the valve core of the existing electromagnetic direct-acting glue spray valve is usually a solid structure, which will cause a large impact on other components every time it moves, and it is easy to cause deformation and damage to the valve core or other components. Summary of the invention

[0004] The present invention provides an electromagnetic direct-acting glue spray valve for high-viscosity fluids, which aims to achieve consistency and high efficiency in gluing high-viscosity adhesives, while solving the problems of easy clogging of the valve port, poor sealing and weak impact resistance.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: an electromagnetic direct-acting glue spray valve for high-viscosity fluids, comprising a main magnetic circuit component, a valve core component and a secondary magnetic circuit component assembled in one body; The main magnetic circuit assembly comprises a main magnetic circuit fixed iron core, a main magnetic circuit coil skeleton sleeved outside the main magnetic circuit fixed iron core, and a main magnetic circuit coil wound on the main magnetic circuit coil skeleton; The valve core assembly includes a main magnetic circuit moving iron, a magnetic isolation sleeve, a secondary magnetic circuit moving iron and a valve seat which are assembled in one body and arranged from top to bottom, and also includes a counterweight block arranged in the magnetic isolation 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, and when the main magnetic circuit coil is powered on, the main magnetic circuit moving iron approaches the main magnetic circuit fixed iron core; The secondary magnetic circuit assembly comprises a secondary magnetic circuit fixed core and a secondary magnetic circuit frameless coil sleeved outside the secondary magnetic circuit fixed core; the secondary magnetic circuit fixed core is located below the secondary magnetic circuit moving iron, and when the secondary magnetic circuit frameless coil is powered on, the secondary magnetic circuit moving iron approaches the secondary magnetic circuit fixed core; It also includes a magnetic isolation tube and a valve insert; the magnetic isolation tube cover is arranged outside the main magnetic circuit fixed core, the valve core assembly and the secondary magnetic circuit fixed core; the valve insert is press-fitted between the valve seat and the secondary magnetic circuit fixed core; After the electromagnetic direct-acting glue spraying valve is pressed onto a valve block matched therewith, a heating glue storage cavity communicated with the fluid channel is formed between the valve insert and the valve block.

[0006] As a limitation of the present invention, the counterweight block includes a plurality of steel sheets stacked in the magnetic isolation sleeve.

[0007] As another limitation of the present invention, the valve core assembly also includes a stud inserted through the main magnetic circuit moving iron, the counterweight block and the secondary magnetic circuit moving iron; the top of the stud is connected to a locking nut, and the bottom is connected to the valve seat.

[0008] 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 isolation tube, and the main magnetic circuit coil housing covers the main magnetic circuit coil frame and the outside of the main magnetic circuit coil.

[0009] 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 isolation tube, and the secondary magnetic circuit coil housing covers the outside of the secondary magnetic circuit frameless coil.

[0010] As a third limitation of the present invention, it also includes a pre-stressed spring installed between the fixed iron core of the main magnetic circuit and the moving iron of the main magnetic circuit. When the main magnetic circuit coil is powered off, the pre-stressed spring is used to push the valve core assembly back to the initial position to close the fluid channel.

[0011] As a further limitation of the present invention, a sealing ring is provided between the valve insert and the valve seat.

[0012] As a further limitation of the present invention, an annular temperature sensor is provided on the valve insert.

[0013] As a further limitation of the present invention, the valve insert is made of brass alloy.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: (1) The present invention realizes dual magnetic circuit control of the valve core assembly by adding a secondary magnetic circuit assembly at the valve port, wherein the main magnetic circuit assembly is used to drive the valve core assembly to move to open the fluid channel, and the secondary magnetic circuit assembly is used to drive the valve core assembly to reset to close the fluid channel. The dual magnetic circuit control method solves the problem in the prior art that the sealing force of the valve body is limited by the size of the pre-stressed spring. The present invention can provide a greater sealing force when closing the fluid channel, thereby effectively avoiding leakage. In addition, the heat generated by the secondary magnetic circuit assembly after power is turned on will also heat the valve insert to achieve heating and heat preservation of the high-viscosity fluid flowing into the heating glue storage chamber, thereby reducing the viscosity of the high-viscosity fluid, thereby reducing the required spraying pressure, thereby being able to more accurately control the amount of glue sprayed, making the glue coating more consistent, and also solving the problem of easy clogging of the valve port.

[0015] Here is an explanation for "the valve body sealing force is limited by the size of the pre-stressed spring": in the prior art, the valve core is only reset by a pre-stressed spring, and the valve body sealing force = valve core gravity + spring elastic force. Since the valve core gravity is constant, the spring size is limited by the valve body size and cannot be changed. The spring stiffness can only be changed within a limited range to increase the valve body sealing force. Therefore, the sealing force of the valve body of the existing structure is limited by the size of the pre-stressed spring.

[0016] (2) The counterweight in the valve core assembly of the present invention is composed of multiple stacked steel sheets. When the valve core assembly is in motion, the inertia of the steel sheets can effectively reduce the impact on other components, thereby preventing the valve core or other components from being deformed or damaged. In addition, compared with the solid structure of the valve core in the prior art, the stacked structure used in the present invention can reduce the mass of the valve core to a certain extent, thereby improving the response speed of the valve core and facilitating efficient spraying during the production process.

[0017] (3) The main magnetic circuit moving iron, the magnetic isolation sleeve, and the secondary magnetic circuit moving iron in the valve core assembly of the present invention are assembled together through studs, and the two ends of the studs are respectively limited by locking nuts and valve seats, so that the formed valve core structure is easy to disassemble and assemble, and the vulnerable parts are easier to replace.

[0018] (4) The preload spring provided in the present invention is used, on the one hand, to provide a certain valve core return force, and cooperate with the secondary magnetic circuit assembly in the power-on state to control the return of the valve core assembly, and the preload spring cooperates with the secondary magnetic circuit assembly to provide a greater sealing force when closing the fluid channel; on the other hand, it is used to provide a certain sealing force in the power-off state to keep the fluid channel closed.

[0019] (5) The valve insert in the present invention is made of brass alloy, which has better thermal conductivity.

[0020] In summary, the present invention has a compact and stable structure, the valve port is not easy to be blocked, the valve core is easy to disassemble and replace, the sealing performance is good and the response speed is fast, and it is suitable as an actuator of an automatic gluing system to perform efficient gluing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a schematic diagram of the structure of the embodiment of the present invention after being press-fitted on a matching valve block; Figure 2 A schematic diagram of a split structure of an embodiment of the present invention; Figure 3 It is a longitudinal cross-sectional view of the structure of the embodiment of the present invention after being press-fitted on a matching valve block; Figure 4 A longitudinal cross-sectional view of the structural relationship of the main magnetic circuit assembly in an embodiment of the present invention; Figure 5 A longitudinal cross-sectional view of the structure of the valve core assembly in an embodiment of the present invention; Figure 6 A longitudinal cross-sectional view of the structural relationship of the secondary magnetic circuit assembly in an embodiment of the present invention; In the figure: 1. Main magnetic circuit assembly; 2. Valve core assembly; 3. Secondary magnetic circuit assembly; 4. Magnetic isolation tube; 5. Valve insert; 6. Preload spring; 7. Valve block; 8. Heating rubber storage chamber; 9. Sealing ring; 10. Ring temperature sensor; 101, main magnetic circuit fixed core; 102, main magnetic circuit coil frame; 103, main magnetic circuit coil; 104, main magnetic circuit coil housing; 105, fastening screws; 106, mounting slot; 201, moving iron of main magnetic circuit; 202, magnetic isolation sleeve; 203, moving iron of secondary magnetic circuit; 204, valve seat; 205, metal ball; 206, steel sheet; 207, stud; 208, locking nut; 209, main air gap of magnetic circuit; 301. secondary magnetic circuit fixed iron core; 302. secondary magnetic circuit skeletonless coil; 303. secondary magnetic circuit coil housing. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0024] This embodiment discloses an electromagnetic direct-acting glue spray valve for high-viscosity fluids. Figures 1 to 3As shown, this embodiment includes a magnetic isolation tube 4, a main magnetic circuit assembly 1, a valve core assembly 2 and a secondary magnetic circuit assembly 3 assembled on the magnetic isolation tube 4, and also includes a valve insert 5 pressed at the valve port, and a pre-compression spring 6 assembled between the main magnetic circuit assembly 1 and the valve core assembly 2. This embodiment is pressed on a valve block 7 with a fluid channel and a nozzle, and uses the electromagnetic principle to achieve spray control of high-viscosity fluid.

[0025] 1. Main magnetic circuit components 1 After the main magnetic circuit assembly 1 is powered on, it is used to drive the valve core assembly 2 to move upward to open the fluid channel of the valve block 7. 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 fixedly mounted on the top of the magnetic isolation tube 4 by means of a fastening screw 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 sleeved on the top of the magnetic isolation tube 4 and is located on the outside of the main magnetic circuit fixed core 101. The main magnetic circuit coil 103 is wound on the main magnetic circuit coil frame 102 as the main magnetic circuit excitation and is controlled by PWM (pulse width modulation). The main magnetic circuit coil housing 104 is made of 08F steel and is fixedly mounted on the top of the magnetic isolation tube 4 and covers the outside of the main magnetic circuit coil frame 102 and the main magnetic circuit coil 103 to protect the main magnetic circuit coil 103.

[0026] 2. Valve core assembly 2 The valve core assembly 2 is arranged inside the magnetic isolation tube 4 and is responsible for opening or closing the fluid channel on the valve block 7. Figure 5 As shown, the valve core assembly 2 includes a main magnetic circuit moving iron 201, a magnetic isolation sleeve 202, a secondary magnetic circuit moving iron 203, a valve seat 204, a metal ball 205, a counterweight and a stud 207. The main magnetic circuit moving iron 201, the magnetic isolation 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 stud 207 is inserted into the main magnetic circuit moving iron 201, the magnetic isolation sleeve 202 and the secondary magnetic circuit moving iron 203, and is located on the central axis. The top of the stud 207 is connected to the locking nut 208, and the bottom is connected to the valve seat 204. The outer limit is formed by connecting the nut and the valve seat 204 to hold the main magnetic circuit in place. The magnetic circuit moving iron 201, the magnetic isolation sleeve 202 and the secondary magnetic circuit moving iron 203 are assembled together; the counterweight block is arranged in the magnetic isolation sleeve 202, that is, inside the hollow cylinder formed by the main magnetic circuit moving iron 201, the magnetic isolation sleeve 202 and the secondary magnetic circuit moving iron 203. The counterweight block in this embodiment is composed of a plurality of stacked annular steel sheets 206, and the middle through hole of the steel sheet 206 is used for the stud 207 to pass through; the metal ball 205 is pressed onto the valve seat 204.

[0027] In this embodiment, the material of the main magnetic circuit moving iron 201 and the secondary magnetic circuit moving iron 203 is 1215 steel, the material of the magnetic isolation sleeve 202 is 6061 aluminum alloy, the material of the steel sheet 206 is 305 stainless steel, the material of the valve seat 204 is brass alloy, and the material of the steel ball is 40Cr.

[0028] like Figure 3 As shown, the valve core assembly 2 is located below the main magnetic circuit fixed core 101 in the main magnetic circuit assembly 1, and the gap between the main magnetic circuit fixed core 101 and the main magnetic circuit moving iron 201 is the magnetic circuit main air gap 209, 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 powered on, the main magnetic circuit fixed core 101 is magnetized, attracting the main magnetic circuit moving iron 201 to approach the main magnetic circuit fixed core 101, and then the valve core assembly 2 moves upward as a whole to open the fluid channel of the valve block 7.

[0029] 3. Preload spring 6 like Figure 3 As shown, the pre-stress 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 installation groove 106 at the bottom center position of the main magnetic circuit fixed iron core 101, and is in a compressed state. When the main magnetic circuit coil 103 is powered off, the pre-stress spring 6 is used to push the valve core assembly 2 down to the initial position to close the fluid channel of the valve block 7.

[0030] 4. Secondary magnetic circuit component 3 The secondary magnetic circuit component 3 is arranged at the valve port position, and is used to apply a downward suction force to the valve core component 2 after power is turned on, so as to drive the valve core component 2 to move back downward under the cooperation of the pre-compression spring 6 to close the fluid channel of the valve block 7, and at the same time heat and keep the high-viscosity fluid flowing to the valve port warm, so as to reduce the viscosity of the high-viscosity fluid. Figure 6 As shown, the secondary magnetic circuit assembly 3 includes a secondary magnetic circuit fixed core 301, a secondary magnetic circuit skeletonless coil 302 and a secondary magnetic circuit coil housing 303. The secondary magnetic circuit fixed core 301 is made of 1215 steel, which is an annular sleeve structure and is fixed at the bottom of the magnetic isolation tube 4; the secondary magnetic circuit skeletonless coil 302 is sleeved at the bottom of the magnetic isolation tube 4 and is located outside the secondary magnetic circuit fixed core 301, and the secondary magnetic circuit skeletonless coil 302 in this embodiment is controlled by PWM (pulse width modulation), which can compensate for the hysteresis effect when the valve core assembly 2 is attracted and improve the response speed of the equipment; the secondary magnetic circuit coil housing 303 is made of 08F steel, which is fixed at the bottom of the magnetic isolation tube 4 and covers the outside of the secondary magnetic circuit skeletonless coil 302, and is used to protect the secondary magnetic circuit skeletonless coil 302.

[0031] like Figure 3As shown, the secondary magnetic circuit fixed iron core 301 is located below the secondary magnetic circuit moving iron 203 in the above-mentioned 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, and then the valve core assembly 2 moves downward as a whole to close the fluid channel of the valve block 7.

[0032] 5. Magnetic isolation tube 4 and valve insert 5 As described above, the magnetic isolation tube 4 is disposed outside the primary magnetic circuit fixed core 101, the valve core assembly 2 and the secondary magnetic circuit fixed core 301, and is made of 305 stainless steel to reduce the hysteresis effect.

[0033] like Figure 3 As shown, the valve insert 5 is press-fitted between the valve seat 204 and the secondary magnetic circuit fixed iron core 301. When the embodiment is press-fitted on the valve block 7, a heating glue storage cavity 8 communicating with the fluid channel is formed between the valve insert 5 and the valve block 7. In this embodiment, the material of the valve insert 5 is brass alloy. In order to improve the sealing performance, a sealing ring 9 is provided between the valve insert 5 and the valve seat 204.

[0034] When the secondary magnetic circuit skeletonless coil 302 is powered on, the heat generated by it is transferred to the valve insert 5 through the secondary magnetic circuit fixed iron core 301, and then the high-viscosity fluid flowing into the heating glue storage chamber 8 is heated and insulated through the valve insert 5, thereby reducing the viscosity of the high-viscosity fluid.

[0035] In order to monitor the temperature, an annular temperature sensor 10 is provided on the valve insert 5 in this embodiment.

[0036] When the present embodiment is used for glue coating, the flow direction of the high viscosity fluid is as follows: Figure 3 As shown by the arrow in the middle, the working process of this embodiment is as follows: S1, glue coating preparation stage: high viscosity fluid enters the heating glue storage chamber 8 through the fluid channel, the secondary magnetic circuit skeletonless coil 302 is powered on and PWM control is performed according to the feedback data of the annular temperature sensor 10, the high viscosity fluid in the heating glue storage chamber 8 is heated, and the secondary magnetic circuit fixed iron core 301 is attracted to the secondary magnetic circuit moving iron 203 to improve the sealing of the fluid channel in the closed state, so that the high viscosity fluid can be transported at a high pressure; S2, glue spraying stage: the secondary magnetic circuit skeleton coil 302 is powered off, the main magnetic circuit coil 103 is powered on and controlled by PWM, and the electromagnetic force is precisely regulated. The main magnetic circuit fixed iron core 101 is used to attract the main magnetic circuit moving iron 201, so that the valve core assembly 2 overcomes its own gravity and the elastic force of the preload spring 6, and moves upward to open the fluid channel of the valve block 7, so that the high-viscosity fluid can be sprayed; S3, temporarily stopping the glue spraying stage: the main magnetic circuit coil 103 is powered off, and the secondary magnetic circuit frameless coil 302 is powered on, and the secondary magnetic circuit fixed iron core 301 attracts the secondary magnetic circuit moving iron 203, and the preload spring 6 cooperates to make the valve core assembly 2 return quickly to quickly close the fluid channel of the valve block 7; S4, equipment closing stage: the secondary magnetic circuit skeletonless coil 302 is powered on to keep the high-viscosity fluid in the heated glue 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 skeletonless coil 302 is powered off, the high-viscosity fluid is completely solidified, and the pre-compression spring 6 is used to provide a certain sealing force to keep the fluid channel in a closed state.

[0037] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is 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 replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic direct-acting glue spray valve for high-viscosity fluids, characterized in that: It includes a main magnetic circuit component, a valve core component and a secondary magnetic circuit component which are assembled into one body; The main magnetic circuit assembly comprises a main magnetic circuit fixed iron core, a main magnetic circuit coil skeleton sleeved outside the main magnetic circuit fixed iron core, and a main magnetic circuit coil wound on the main magnetic circuit coil skeleton; The valve core assembly includes a main magnetic circuit moving iron, a magnetic isolation sleeve, a secondary magnetic circuit moving iron and a valve seat which are assembled in one body and arranged from top to bottom, and also includes a counterweight block arranged in the magnetic isolation 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, and when the main magnetic circuit coil is powered on, the main magnetic circuit moving iron approaches the main magnetic circuit fixed iron core; The secondary magnetic circuit assembly comprises a secondary magnetic circuit fixed core and a secondary magnetic circuit frameless coil sleeved outside the secondary magnetic circuit fixed core; the secondary magnetic circuit fixed core is located below the secondary magnetic circuit moving iron, and when the secondary magnetic circuit frameless coil is powered on, the secondary magnetic circuit moving iron approaches the secondary magnetic circuit fixed core; It also includes a magnetic isolation tube and a valve insert; the magnetic isolation tube cover is arranged outside the main magnetic circuit fixed core, the valve core assembly and the secondary magnetic circuit fixed core; the valve insert is press-fitted between the valve seat and the secondary magnetic circuit fixed core; After the electromagnetic direct-acting glue spraying valve is pressed onto a valve block matched therewith, a heating glue storage cavity communicated with the fluid channel is formed between the valve insert and the valve block.

2. The electromagnetic direct-acting glue spray valve for high-viscosity fluid according to claim 1, characterized in that: The counterweight block includes a plurality of steel sheets stacked in the magnetic isolation sleeve.

3. The electromagnetic direct-acting glue spray valve for high-viscosity fluid according to claim 1 or 2, characterized in that: The valve core assembly also includes a stud bolt that is inserted through the main magnetic circuit moving iron, the counterweight block, and the secondary magnetic circuit moving iron; the top of the stud bolt is connected to a locking nut, and the bottom is connected to the valve seat.

4. The electromagnetic direct-acting glue spray valve for high-viscosity fluid 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 isolation tube, and the main magnetic circuit coil housing covers the main magnetic circuit coil frame and the outside of the main magnetic circuit coil.

5. The electromagnetic direct-acting glue spray valve for high-viscosity fluid according to claim 4, characterized in that: The secondary magnetic circuit assembly also includes a secondary magnetic circuit coil housing sleeved on the lower part of the magnetic isolation tube, and the secondary magnetic circuit coil housing covers the exterior of the secondary magnetic circuit frameless coil.

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

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

8. The electromagnetic direct-acting glue spray valve for high-viscosity fluid according to claim 7, characterized in that: An annular temperature sensor is arranged on the valve insert.

9. The electromagnetic direct-acting glue spray valve for high-viscosity fluid according to claim 8, characterized in that: The material of the valve insert is brass alloy.

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