Dispensing speed testing device based on fluid mechanics analysis

Abstract

The utility model discloses a dispensing speed testing device based on fluid mechanics analysis, which comprises a to-be-tested dispensing system comprising a dispensing valve and a dispensing needle detachably connected with the dispensing valve; wherein a blade type flow meter is integrated in the dispensing valve, the blade type flow meter is composed of a rotatable shaft, blades installed on the shaft at intervals and a sensor, and the blade type flow meter is installed at the center position, close to an internal glue flow channel of a glue outlet, of the dispensing valve; the sensor is used for detecting the rotating speed and angle information of the blade to obtain glue flow information; the device further comprises a glue supply system and a gas path system; wherein the glue supply system is connected with the glue dispensing valve through a glue pipe, and the gas path system is connected with the glue dispensing valve through a gas pipe; and the calculating device is connected with the sensor of the vane type flow meter through a signal line and is used for calculating the dispensing speed of the glue outlet of the dispensing needle head.

Description

TECHNICAL FIELD

[0001] The present specification relates to the technical field of dispensing speed testing, and in particular to a dispensing speed testing device based on fluid mechanics analysis. BACKGROUND

[0002] With the rapid development of science and technology, the precision requirement of products on process is higher and higher. In the electronic, automobile, medical and other industries, dispensing process has a wide range of applications. Dispensing process can achieve a variety of functions, including filling gaps, waterproof and dustproof, shock and impact resistance, aesthetics and cost savings. Through the reasonable application of dispensing process, manufacturing industry can well improve the performance and quality of products. The dispensing speed in the dispensing process is a key factor affecting the precision of glue coating and production rhythm. The current measurement standard of glue flow rate is flow meter measurement method. Among them, the flow meter is an instrument for measuring the flow rate of glue, which can measure the flow of glue through a specific area per unit time.

[0003] At present, the installation position of the flow meter is in front of the dispensing valve. After the glue passes through the flow meter, it enters the dispensing valve, and then enters the dispensing needle through the control of the dispensing valve, and finally completes the glue discharge. In this scheme, the pressure loss will occur in the dispensing valve and the dispensing needle due to the existence of resistance, so there will be a deviation between the actual dispensing speed of the glue discharge port and the speed reflected by the flow meter. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the embodiment of the present specification is realized as follows: the utility model provides a dispensing speed testing device based on fluid mechanics analysis, comprising:

[0005] The dispensing system to be measured comprises a dispensing valve and a dispensing needle head detachably connected with the dispensing valve; wherein the dispensing valve is internally integrated with a vane type flow meter, the vane type flow meter is composed of a rotatable shaft, blades spaced apart on the shaft and a sensor, the vane type flow meter is installed at the central position of the internal glue flow channel of the dispensing valve close to the glue discharge port, and the sensor is used to detect the rotation speed and angle information of the blade to obtain the glue flow information;

[0006] The glue supply system and the air path system; wherein the glue supply system is connected with the dispensing valve through a glue pipe, and is used to provide the required glue for dispensing operation, and the air path system is connected with the dispensing valve through an air pipe, and is used to provide power and auxiliary control for the action of the valve core of the dispensing valve and the glue injection;

[0007] The computing device is connected with the sensor of the vane type flow meter through a signal line, and is used to calculate the dispensing speed of the glue discharge port of the dispensing needle head.

[0008] In some alternative embodiments, the glue valve comprises a valve body and a valve core, the valve core is arranged in the valve body for controlling the on-off of glue, the vane flowmeter is integrated in the flow channel between the valve core and the glue outlet of the glue valve, and the vane flowmeter is tightly matched with the valve body and the valve core, so as to ensure that the glue only passes around the vane of the vane flowmeter.

[0009] In some alternative embodiments, the sensor adopts an electromagnetic induction sensor, and an induction coil of the electromagnetic induction sensor is arranged around the shaft of the vane flowmeter.

[0010] In some alternative embodiments, the glue supply system adopts a pneumatic glue supply device or a servo mechanical glue supply device; wherein the pneumatic glue supply device comprises an air pressure source, an air pressure adjusting valve and a glue barrel, the air pressure adjusting valve is used for adjusting the output air pressure of the air pressure source, so as to push the glue in the glue barrel to flow to the glue valve through the glue pipe; the servo mechanical glue supply device comprises a servo motor, a screw rod and a glue cavity, the servo motor is used for driving the screw rod to rotate, so as to extrude the glue in the glue cavity to flow to the glue valve through the glue pipe.

[0011] In some alternative embodiments, the air path system comprises an air source, a filter, a pressure regulating valve and an electromagnetic valve, the air source is used for providing compressed air, the compressed air is filtered by the filter and the air pressure is adjusted by the pressure regulating valve, and then the on-off of the electromagnetic valve is controlled, so as to provide power and auxiliary control for the action of the valve core of the glue valve and the glue injection.

[0012] In some alternative embodiments, the glue valve and the glue needle are connected through threads, a sealing gasket is arranged at the thread connection, the sealing gasket is made of fluororubber, the inner diameter of the sealing gasket is matched with the diameter of the glue outlet of the glue valve, and the outer diameter of the sealing gasket is matched with the outer diameter of the connection end of the glue needle.

[0013] In some alternative embodiments, the vane of the vane flowmeter is made of stainless steel, the surface of the vane is polished, and the shape of the vane is arc-shaped.

[0014] In some alternative embodiments, the to-be-tested glue injection system, the glue supply system and the air path system adopt an integrated positioning and mounting structure, the integrated positioning and mounting structure comprises a mounting base and positioning clamping grooves, and the to-be-tested glue injection system, the glue supply system and the air path system are respectively fixed in the corresponding positioning clamping grooves.

[0015] In some alternative embodiments, the overall shell of the testing device is made of aluminum alloy and is formed through a die casting process, the surface of the shell is provided with heat dissipation fins, the height of the heat dissipation fins is 30-40 mm, the spacing of the heat dissipation fins is 4-6 mm, and the heat dissipation fins are arranged in an equidistant array, so as to enhance the heat dissipation performance of the testing device.

[0016] In some alternative embodiments, the computing device adopts one of a PC, an embedded controller, a programmable logic controller, a microprocessor or an industrial computer.

[0017] The utility model discloses a beneficial effect can be achieved as follows: the utility model discloses technical scheme, the blade type flowmeter is integrated in the glue valve, the blade type flowmeter is by rotatable shaft, the blade that installs on the shaft and is separated, and the sensor is composed, and the blade type flowmeter is installed in the central position of the inside glue flow channel of glue valve close to the glue outlet, and the sensor is used for detecting the rotation speed and angle information of blade to obtain the glue flow information.Combining intelligent computing system based on the principle of fluid mechanics (Bernoulli equation) secondary calculation can consider the pressure loss and other factors of glue in glue valve and glue needle, thereby more accurately calculate the actual glue dispensing speed of glue needle glue outlet.Compared with the traditional mode that only installs the flowmeter in the front end of glue valve, the difference between the measurement result of the scheme and the actual glue coating glue speed is small, can provide more accurate speed data for glue dispensing process, and help to improve the precision and quality control of glue dispensing. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present specification or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0019] Figure 1 The structure diagram of the glue dispensing speed test device based on fluid mechanics analysis provided by the embodiment of the present specification is shown.

[0020] Figure 2 The enlarged view of the glue valve and glue needle in Figure 1

[0021] Among them, 1 indicates glue valve, 101 indicates air path interface, 102 indicates glue pipe interface, 103 indicates glue outlet connecting part, 2 indicates glue needle, 3 indicates glue pipe, 4 indicates air pipe, 5 indicates glue supply system, 6 indicates air path system, 7 indicates computing device, 8 indicates mounting base, 9 indicates signal line, 10 indicates blade type flowmeter. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the present application will be described clearly and completely in the following combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0023] ​The prior art part of the background introduces that the installation position of the flowmeter in the flowmeter measurement method is in front of the dispensing valve, which can cause the deviation between the actual dispensing speed of the glue outlet and the speed reflected by the flowmeter. The following will analyze it in detail, and then introduce the technical scheme of the utility model.

[0024] The dispensing valve has a complex internal structure, and the glue encounters various resistances when flowing therein. First, the movement of the valve core in the valve body needs to overcome a certain friction force, and when the valve core is opened or closed, the sealing surface and the guiding part between the valve core and the valve body will generate friction resistance. This friction force will consume the energy of the glue flow, causing the pressure to drop. For example, in a frequently operated dispensing valve, if the valve core sealing surface is worn or poorly lubricated, the friction force will increase, further exacerbating the pressure loss. Second, the shape and size changes of the flow channel inside the dispensing valve will also cause resistance. The flow channel can have turns, reductions or enlargements, etc. According to the principle of fluid mechanics, when the fluid flows through these parts, local resistance loss will occur. For example, at the sudden reduction of the flow channel, the flow rate of the glue will increase sharply, and according to Bernoulli's equation, the increase of the flow rate will cause the pressure to drop; and at the turning of the flow channel, the glue will generate centrifugal force due to inertia, collide and rub with the flow channel wall, causing energy loss and pressure drop.

[0025] In addition, the viscosity of the glue itself is also an important factor causing resistance. When the glue with high viscosity flows in the dispensing valve, the internal friction between the molecules is large, and a larger pressure is needed to push it to flow. During the dispensing process, the viscosity of the glue can be affected by factors such as temperature and composition changes, and if the viscosity increases, the resistance of the glue flowing in the dispensing valve will also increase accordingly, resulting in greater pressure loss. These factors work together to gradually reduce the pressure of the glue flowing in the dispensing valve from the inlet to the outlet (i.e. close to the position of the dispensing needle), causing a certain degree of pressure loss, resulting in the actual glue pressure reaching the dispensing needle being lower than the pressure at the flowmeter, and further affecting the actual dispensing speed of the glue outlet. Therefore, if the installation position of the flowmeter is in front of the dispensing valve, it will cause the deviation between the actual dispensing speed of the glue outlet and the speed reflected by the flowmeter. The dispensing speed refers to the speed of the glue flowing out of the dispensing needle outlet.

[0026] In view of this problem, the technical scheme of the utility model provides a dispensing speed testing device based on fluid mechanics analysis, which integrates a vane type flowmeter in the dispensing valve system, and combines fluid mechanics and flow calculation program, so as to quickly and accurately reflect the dispensing speed of the glue outlet of the dispensing needle.

[0027] The technical scheme of the present application will be described below with reference to the drawings, Figure 1 The structure diagram of the dispensing speed testing device based on fluid mechanics analysis provided by the embodiment of the present application is shown in Figure 1As shown, the test device comprises a point glue system to be tested, the point glue system to be tested comprising a point glue valve 1 and a point glue needle head 2 detachably connected with the point glue valve 1; wherein a vane flowmeter 10 is integrated inside the point glue valve 1, the vane flowmeter 10 being composed of a rotatable shaft, vane installed on the shaft at intervals and a sensor, the vane flowmeter 10 being installed at a central position of the internal glue flow channel of the point glue valve 1 close to a glue outlet, the sensor being used to detect the rotating speed and angle information of the vane to obtain the glue flow information; the test device further comprises a glue supply system 5 and an air path system 6; wherein the glue supply system 5 is connected with the point glue valve 1 through a glue pipe 3, and is used to provide the required glue for the point glue operation, the air path system 6 is connected with the point glue valve 1 through an air pipe 4, and is used to provide power and auxiliary control for the action of the valve core of the point glue valve 1 and the glue injection. The test device further comprises a calculation device 7 for calculating the point glue speed of the glue outlet of the point glue needle head, the calculation device 7 can be connected with the sensor of the vane flowmeter 10 through a signal line 9, the calculation device 7 is pre-installed with a flow calculation program, the flow calculation program is used to calculate the flow of the glue at the glue outlet of the point glue valve 1 according to the number of vane revolutions and the flowmeter constant, then the flow speed of the glue at the glue outlet of the point glue valve 1 is calculated according to the diameter of the internal channel of the point glue valve 1 and the flow, and the point glue speed of the glue outlet of the point glue needle head 2 is calculated based on the Bernoulli equation combined with the input diameter of the glue outlet of the point glue needle head 2, the length of the point glue needle head 2, the friction coefficient of the inner wall of the point glue needle head 2 and the density of the glue.

[0028] Referring to Figure 2 , Figure 2 for Figure 1 , the other end of the glue pipe 3 is connected with the glue pipe 3 interface 102 in the point glue system to be tested, so as to provide the required glue for the point glue operation, the air path system 6 is connected with the air path interface 101 of the point glue valve 1 through the air pipe 4, so as to provide power and auxiliary control for the action of the valve core of the point glue valve 1 and the glue injection, and the glue outlet connecting part 103 of the point glue valve 1 is connected with the point glue needle head 2.

[0029] The working principle of the utility model will be described below, Figure 1 The steps of calculating the point glue speed of the glue outlet of the point glue needle head 2 by the fluid mechanics analysis method involved in the utility model are as follows:

[0030] Firstly, the number of revolutions N of the vane in one second is obtained through the sensor of the vane flowmeter 10, the sensor can accurately detect the rotation of the vane under the action of the glue flow and convert it into an electrical signal to be transmitted to the intelligent calculation system.

[0031] Then, based on the known flowmeter constant K (this constant is an inherent characteristic parameter of the flowmeter, used to convert the vane rotation number into the actual flow rate; its value is usually given in the flowmeter's product specifications or determined through calibration experiments), the flow rate M of the glue at the outlet of dispensing valve 1 is calculated using the formula M = N * K. For example, if the sensor reads a vane rotation number N of 50 within 1 second, and the flowmeter constant K is 0.1 (unit: ml / revolution), then according to the formula, M = 50 * 0.1 = 5 ml / second, meaning the flow rate of the glue at the outlet of dispensing valve 1 is 5 ml / second.

[0032] To calculate the flow velocity V1 of the glue at the outlet of dispensing valve 1, the diameter D1 of the glue flow channel inside dispensing valve 1 needs to be determined before calculating V1.

[0033] Based on the flow rate M and the diameter D1 of the inner channel of dispensing valve 1, the formula V1 = 4M / (π*V1) is used. 2 Calculate the flow velocity V1 of the glue at the outlet of dispensing valve 1. This formula is derived based on the continuity equation of fluids, assuming steady flow of the glue within dispensing valve 1, and calculating the velocity through the relationship between flow rate and channel cross-sectional area. For example, if the previously calculated flow rate M is 5 ml / s, and the diameter D1 of the channel within dispensing valve 1 is 5 mm, then V1 = 4 * 5 / (3.14 * 0.005) 2 )≈2547.77 m / s.

[0034] Calculate the resistance H generated by the flow of glue in the dispensing needle 2. f This step requires the dispensing nozzle diameter D of the dispensing needle 2, the length L of the dispensing needle 2, and the coefficient of friction λ of the inner wall of the dispensing needle 2. These parameters collectively determine the resistance encountered by the adhesive as it flows within the dispensing needle 2. The coefficient of friction λ reflects the frictional characteristics between the adhesive and the inner wall of the dispensing needle 2. Its value is related to the properties of the adhesive, the material and surface roughness of the needle's inner wall, and is generally determined through experiments or empirical data. Specifically, it can be calculated using formula H... f =λ*(L / D)*(V1) 2 / 2) Calculate the resistance Hf generated by the flow of glue in the dispensing needle 2. For example, assuming the diameter D of the glue outlet of the dispensing needle 2 is 1 mm (equivalent to 0.001 m), the length L of the dispensing needle 2 is 10 mm (equivalent to 0.01 m), the coefficient of friction λ is 0.2, and the previously calculated V1 is 2547.77 m / s, then Hf... f =0.2*(0.01 / 0.001)*(2547.77) 2 / 2)≈6.49×10 6 Pa (two significant figures are retained here; the number of figures to retain is determined according to the specific precision requirements in actual calculations).

[0035] The pressure change ΔP generated by the flow of glue in the dispensing needle 2 is calculated using the density ρ of the glue (and the resistance H calculated in the previous step f to calculate the pressure change ΔP. Specifically, according to the formula ΔP = ρ * H f calculated. For example, if the density ρ of the glue is 1.2 grams per cubic centimeter (equivalent to 1200 kilograms per cubic meter), and the H f calculated in the previous step is 6.49 × 10 6 Pa, then ΔP = 1200 * 6.49 × 10 6 = 7.79 × 10 9 Pa (here, two significant digits are retained).

[0036] Finally, through Bernoulli's equation calculation, the expression for the dispensing speed V2 of the glue outlet of the dispensing needle 2 can be obtained as V2 = (V1 2 - (λ * L * V1 2 ) / D) ^ (1 / 2), and the calculation formula of Bernoulli's equation is shown in Equation 1:

[0037] P + (1 / 2) ρv 2 + ρgh = C (1)

[0038] Where the symbol P represents the pressure at a point in the fluid, the symbol v represents the flow rate of the fluid at that point, the symbol ρ represents the fluid density, the symbol g represents the acceleration due to gravity, and the symbol h represents the height at which the point is located. The symbol C is a constant to indicate that in the steady flow of an ideal fluid, the sum of the pressure energy, kinetic energy, and gravitational potential energy at each point on the streamline remains constant. The various symbols and their meanings are summarized in Table 1 as follows:

[0039] Table 1 Meaning of variables in dispensing speed calculation formula

[0040]

[0041] Through the above detailed fluid mechanics analysis steps, the dispensing speed of the glue outlet of the dispensing needle 2 can be accurately calculated, providing an important basis for the optimization and control of the dispensing process. In practical applications, the accuracy of each parameter needs to be ensured, and the calculation results need to be reasonably analyzed and applied according to the actual situation. At the same time, the calculation device 7 can be used for remote data interaction with other intelligent devices through an Ethernet interface or a wireless communication module (such as Wi-Fi, Bluetooth, etc.), thereby realizing remote monitoring and control functions.

[0042] The above calculation function is integrated into a complete software system to obtain a flow calculation program, so that an automatic process from data acquisition to final dispensing speed calculation is realized. Meanwhile, in order to improve the stability and reliability of the system, an error processing and exception detection mechanism can be added. For example, when the sensor data transmission is interrupted or a numerical anomaly occurs in the calculation process, the system can timely issue an alarm and take corresponding measures, such as suspending the dispensing operation, recording error information, etc.

[0043] In the technical scheme of the utility model, the leaf type flowmeter 10 is integrated in the dispensing valve 1, the leaf type flowmeter 10 is composed of a rotatable shaft, leaf blades installed on the shaft at intervals and a sensor, the leaf type flowmeter 10 is installed at the central position of the internal glue flow channel of the dispensing valve 1 close to the glue outlet, and the sensor is used to detect the rotating speed and angle information of the leaf blades to obtain the glue flow information. Then, based on the principle of fluid mechanics (Bernoulli equation), the intelligent calculation system is combined to perform secondary calculation, the pressure loss of the glue in the dispensing valve 1 and the dispensing needle 2 and other factors can be considered, and therefore the actual dispensing speed of the glue outlet of the dispensing needle 2 can be more accurately calculated. Compared with the traditional mode of installing a flowmeter at the front end of the dispensing valve 1, the difference between the measurement result of the present scheme and the actual glue dispensing speed is extremely small, more accurate speed data is provided for the dispensing process, and the precision and quality control of dispensing are improved.

[0044] The leaf type flowmeter 10 is installed at the central position of the internal glue flow channel of the dispensing valve 1 close to the glue outlet, and the influence of interference factors on flow measurement can be reduced. Specifically, the leaf type flowmeter 10 is installed at the position close to the glue outlet, and the influence of various interference factors on flow measurement when the glue flows in the front end flow channel of the dispensing valve 1 can be reduced to the maximum extent. The front end flow channel of the dispensing valve 1 can have a complex structure, such as a turning, a variable diameter and the like, and these parts can cause the glue to have unstable flow states such as turbulent flow and vortex, and cause inaccurate flow measurement. The leaf type flowmeter 10 is installed in the relatively stable flow channel region close to the glue outlet, the flow state of the glue is closer to ideal laminar flow, the leaf blades can more accurately respond to the real flow of the glue, and therefore the measurement accuracy is improved.

[0045] Meanwhile, the position close to the glue outlet can measure the glue flow about to flow out of the dispensing valve 1, and this flow data is more directly related to the actual dispensing process. Compared with the installation at the front end of the dispensing valve 1, the flow measured at this position can better reflect the actual glue output after the glue passes through various resistances and flow channel changes in the dispensing valve 1, and provide more reliable basic data for subsequent calculation of the dispensing speed based on the flow. Because the flow of the glue can change due to internal resistance during the process of flowing from the front end of the dispensing valve 1 to the glue outlet, only the measurement close to the glue outlet can obtain the flow value closest to the actual dispensing time.

[0046] On the basis of the foregoing technical solutions, some further optimization solutions are provided below.

[0047] In an optional embodiment, the glue dispensing valve 1 can include a valve body and a valve core, and the valve core is arranged in the valve body for controlling the opening and closing of the glue. The vane flowmeter 10 is integrated in the flow channel between the valve core and the glue outlet of the glue dispensing valve 1, and the vane flowmeter 10 is tightly matched with the valve body and the valve core, so as to ensure that the glue only passes around the vane of the vane flowmeter 10.

[0048] In this solution, the valve body of the glue dispensing valve 1 is the shell structure of the entire valve, which can usually be made of metal materials (such as stainless steel, aluminum alloy, etc.) and needs to have sufficient strength and corrosion resistance to withstand the pressure and chemical corrosion of the glue. The valve body is designed with precise flow channels to provide a passage for the flow of glue. The valve core is a movable part installed in the valve body, and its main function is to control the opening and closing of the glue. The shape and size of the valve core are matched with the internal flow channel of the valve body, and the valve core is moved in the valve body to open or close the glue passage. For example, the valve core can be a cylindrical piston that blocks or opens the flow channel by moving up and down. When the valve core moves upward, the glue passage is opened, and the glue can flow from the glue supply system 5 into the glue dispensing valve 1 and to the glue dispensing needle 2; when the valve core moves downward, the valve core tightly adheres to the sealing surface of the valve body, blocking the flow of glue, and achieving precise control of the opening and closing of the glue.

[0049] The vane flowmeter 10 is integrated in the flow channel between the valve core and the glue outlet of the glue dispensing valve 1, which is in a critical position of the glue flow path, and can be composed of a rotatable shaft, vane installed on the shaft at intervals, and a sensor. Among them, the rotatable shaft is installed in parallel with the axis of the flow channel, and the vane is uniformly distributed on the shaft, and the shape is usually designed as an arc, which helps the vane to better rotate under force when the glue flows. When the glue flows from the glue supply system 5 into the glue dispensing valve 1 and through the vane flowmeter 10, the flow of the glue will impact the vane, causing the vane to rotate around the shaft. The rotation speed of the vane is proportional to the flow rate of the glue, that is, the greater the flow rate of the glue, the faster the rotation speed of the vane.

[0050] The sensor is used to detect the rotation speed and angle information of the vane to obtain the flow information of the glue. The matching mode of the sensor and the vane flowmeter 10 is crucial. For example, when an electromagnetic induction sensor is used, the induction coil is wrapped around the shaft of the vane flowmeter 10. When the vane rotates, it will cut the magnetic field generated by the induction coil, thereby generating an induced electromotive force in the coil. The frequency of the change of the induced electromotive force is related to the rotation speed of the vane. By measuring the frequency of the induced electromotive force, the rotation speed of the vane can be accurately calculated, and then according to the pre-calibrated flowmeter constant K, the flow M of the glue at the glue outlet of the glue dispensing valve 1 can be calculated by the formula M=N*K (where M is the flow, N is the number of vane rotations, and K is the flowmeter constant).

[0051] In the technical solution of the present application, the close fit between the vane flowmeter 10 and the valve body and valve core is the key to ensuring measurement accuracy and normal flow of glue. In terms of structural design, the shell of the vane flowmeter 10 can be closely fitted with the inner wall of the flow channel of the valve body to form a sealed space, preventing glue from leaking or shunting during flow. At the same time, the shaft of the vane flowmeter 10 can be connected to the valve body and valve core using high-precision bearings or sealing structures to ensure that the shaft can rotate flexibly and does not jam or wobble during rotation, thereby ensuring that the vane can respond stably to changes in the flow of glue.

[0052] In terms of cooperation with the valve core, when the valve core controls the on-off of the glue, its action will not affect the normal operation of the vane flowmeter 10, and when the valve core is closed, it can ensure that the glue completely stops flowing and does not remain around the vane of the vane flowmeter 10, affecting the measurement accuracy of the next dispensing. For example, when the valve core is in the closed position, its sealing surface is in close contact with the sealing surface of the valve body, and also forms a seal with the inlet end of the vane flowmeter 10, preventing glue from continuing to flow into the vane area after the valve core is closed. This close-fitting design allows glue to pass only around the vane of the vane flowmeter 10, ensuring the accuracy and reliability of the measurement, and providing accurate flow data basis for calculating the dispensing speed of the dispensing needle 2 based on the principle of fluid mechanics.

[0053] In an optional embodiment, the sensor can use an electromagnetic induction sensor with an induction coil surrounding the shaft of the vane flowmeter 10.

[0054] When the vane rotates around the shaft under the action of the glue flow, the vane acts as a conductor that cuts the magnetic field lines. Due to the rotation of the vane, the magnetic flux passing through the induction coil changes periodically, generating an induced electromotive force in the coil. The frequency of this induced electromotive force is directly related to the rotational speed of the vane. The faster the vane rotates, the faster the magnetic flux changes, and the higher the frequency of the induced electromotive force. By measuring the frequency of the induced electromotive force, the rotational speed information of the vane can be accurately obtained, and then the flow rate M of the glue at the glue outlet of the dispensing valve 1 can be calculated according to the pre-calibrated flowmeter constant K (the formula is M = N * K, where N is the number of vane revolutions, which can be converted from the frequency of the induced electromotive force).

[0055] The induction coil is arranged around the shaft of the vane flowmeter 10. This design has multiple advantages. First, this layout can maximize the use of the magnetic field changes generated by the rotation of the vane. Since the vane rotates on the shaft, arranging the induction coil closely around the shaft ensures that the vane is always within the effective range of the magnetic field of the coil during rotation, maximizing the efficiency of the vane cutting the magnetic field lines and thus generating the strongest induced electromotive force signal. For example, if the induction coil is too far away from the shaft or is not properly positioned, it may not effectively cut the magnetic field lines at certain rotation angles, reducing the strength of the induced electromotive force and affecting the sensor's accurate measurement of the vane's rotational speed.

[0056] Second, the induction coil structure around the shaft helps improve the sensor's sensitivity and response speed. Since the coil can capture the magnetic field changes generated by the rotation of the vane in all directions, it can quickly respond to even slight changes in the vane's rotational speed and convert them into corresponding changes in the electrical signal. This is crucial for accurately measuring glue flow, as the changes in glue flow during dispensing can be very subtle, requiring a sensor with high sensitivity and fast response capabilities. In addition, this structure also facilitates the installation and adjustment of the sensor, allowing it to better match the overall structure of the vane flowmeter 10 and ensuring the stability and reliability of the entire system.

[0057] In an alternative embodiment, the glue supply system 5 can use a pneumatic glue supply device or a servo mechanical glue supply device. The pneumatic glue supply device includes a gas pressure source, a gas pressure regulating valve, and a glue barrel. The gas pressure regulating valve is used to adjust the output gas pressure of the gas pressure source, thereby pushing the glue in the glue barrel to flow through the glue pipe 3 to the dispensing valve 1. The servo mechanical glue supply device can include a servo motor, a screw, and a glue cavity. The servo motor is used to drive the screw to rotate, thereby extruding the glue in the glue cavity to flow through the glue pipe 3 to the dispensing valve 1.

[0058] In an alternative embodiment, the testing device can also include an air path system 6 connected to the dispensing valve 1 through the air pipe 4. The air path system 6 includes a gas source, a filter, a pressure regulating valve, and an electromagnetic valve. The gas source is used to provide compressed air, which is filtered by the filter and adjusted in pressure by the pressure regulating valve, and then controlled by the electromagnetic valve to turn on and off, providing power and auxiliary control for the valve core action of the dispensing valve 1 and the glue injection.

[0059] In an alternative embodiment, the dispensing valve 1 and the dispensing needle 2 can be connected by a threaded connection, and a sealing gasket is arranged at the threaded connection. The sealing gasket is made of fluororubber, and its inner diameter is adapted to the diameter of the glue outlet of the dispensing valve 1, and its outer diameter is adapted to the outer diameter of the connection end of the dispensing needle 2.

[0060] In the technical solution of the embodiment, the dispensing valve 1 and the dispensing needle 2 are connected by screw threads. Specifically, the dispensing valve 1 is provided with external threads at the glue outlet, and the connecting end of the dispensing needle 2 is machined with matching internal threads. When the dispensing needle 2 needs to be installed on the dispensing valve 1, the operator only needs to align the dispensing needle 2 with the glue outlet of the dispensing valve 1, and then rotate the dispensing needle 2 clockwise. Through the meshing action of the threads, the dispensing needle 2 is gradually tightened on the dispensing valve 1. This threaded connection can provide sufficient connection strength to ensure that the dispensing needle 2 will not accidentally fall off due to the pressure of the glue or other external forces during the dispensing process.

[0061] The sealing washer is used to ensure that the glue does not leak from the threaded connection, and the material is selected to be fluororubber. Fluororubber is a high-performance rubber material with excellent chemical corrosion resistance, high-temperature resistance, and aging resistance. In the dispensing process, the glue may have various chemical properties, and there may be temperature changes during the dispensing process. The sealing washer made of fluororubber can effectively resist the erosion of the glue and the influence of temperature changes, and can maintain good sealing performance for a long time. For example, for some glues containing acidic or alkaline components, the sealing washer made of ordinary rubber may react chemically and lose its sealing function, while fluororubber can work stably to ensure that the glue does not leak from the threaded connection.

[0062] In the optional embodiment, the blades of the vane flowmeter 10 can be made of stainless steel, and the surface of the blades is polished.

[0063] In the technical solution of the embodiment, the blades of the vane flowmeter 10 are made of stainless steel. Stainless steel has excellent corrosion resistance and can resist the corrosion of glue and other chemicals that may be contacted. In the dispensing process, the composition of the glue is complex and diverse, and may contain various chemical solvents, additives, etc. These substances may corrode the blades, while the stainless steel material can effectively prevent the blades from being corroded by long-term contact with the glue, ensuring the long-term stable operation of the vane flowmeter 10. For example, in some application scenarios using acidic or alkaline glue, blades made of ordinary metal may be rapidly corroded, resulting in rough blade surfaces and reduced structural strength, which may affect the rotation performance of the blades and the measurement accuracy of the flowmeter. Stainless steel material can maintain good performance in such harsh environments.

[0064] The polished blade surface has significantly improved smoothness, which directly reduces the friction of the glue flowing on the blade surface. In fluid mechanics, the smaller the friction, the smaller the flow resistance of the fluid, which helps the glue to flow more smoothly through the blade, making the blade more sensitive to changes in glue flow, thereby improving the accuracy of the flowmeter measurement.

[0065] In an optional embodiment, the point glue system to be tested, the glue supply system 5 and the air path system 6 can adopt an integrated positioning installation structure, which comprises a mounting base 8 and a positioning clamping groove; the point glue system to be tested, the glue supply system 5 and the air path system 6 are respectively fixed in the corresponding positioning clamping grooves.

[0066] In the embodiment, the glue supply system 5, the air path system 6, the point glue system, the vane type flowmeter 10 and the computing device 7 are organically integrated together, and the relative position accuracy of the components is good. Such a compact layout not only reduces the overall volume of the equipment and saves production space, but also makes the connection between the components more compact, reduces the length of the glue flow path and the signal transmission line, reduces the risk of pressure loss and signal interference, and improves the overall performance and stability of the system.

[0067] In an optional embodiment, the overall shell of the test device can be made of aluminum alloy and formed by pressure casting. The surface of the shell is provided with heat dissipation fins. The height of the heat dissipation fins can be between 30-40mm, the interval is 4-6mm, and the heat dissipation fins are arranged in an equidistant array to enhance the heat dissipation performance of the test device.

[0068] In an optional embodiment, the computing device 7 can adopt one of a PC, an embedded controller, a programmable logic controller, a microprocessor or an industrial computer. Taking the PC as an example, the PC is a general-purpose computing device, which has rich hardware interfaces (such as USB and PCI-E) and mature operating systems (such as Windows), and has high processing speed, so that it can directly receive the signals input by the sensor without complex hardware conversion, thereby ensuring the accuracy and efficiency of the point glue speed calculation.

[0069] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0070] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions without creative labor should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope defined in the specification.

Claims

1. A dispensing speed testing device based on fluid dynamics analysis, characterized in that, include: The dispensing system under test includes a dispensing valve and a dispensing needle detachably connected to the dispensing valve; wherein, the dispensing valve integrates a vane flow meter, which consists of a rotatable shaft, vanes spaced apart on the shaft, and a sensor. The vane flow meter is installed in the center of the internal glue flow channel of the dispensing valve near the glue outlet, and the sensor is used to detect the rotational speed and angle information of the vanes to obtain glue flow information. The system includes an adhesive supply system and an air supply system. The adhesive supply system is connected to the dispensing valve via a hose and is used to provide the adhesive required for the dispensing operation. The air supply system is connected to the dispensing valve via an air hose and is used to provide power and auxiliary control for the valve core movement and adhesive spraying of the dispensing valve. The computing device is connected to the sensor of the vane flow meter via a signal line and is used to calculate the dispensing speed at the dispensing nozzle of the dispensing needle.

2. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The dispensing valve includes a valve body and a valve core. The valve core is located in the valve body and is used to control the flow of glue. The vane flow meter is integrated in the flow channel between the valve core and the glue outlet of the dispensing valve. The vane flow meter is tightly fitted with the valve body and the valve core to ensure that the glue only passes around the vanes of the vane flow meter.

3. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The sensor is an electromagnetic induction sensor, and the induction coil of the electromagnetic induction sensor is wrapped around the shaft of the vane flow meter.

4. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The glue supply system adopts a pneumatic glue supply device or a servo mechanical glue supply device; the pneumatic glue supply device includes an air pressure source, an air pressure regulating valve and a glue tank. The air pressure regulating valve is used to regulate the output air pressure of the air pressure source, thereby pushing the glue in the glue tank to flow through the glue tube to the dispensing valve; the servo mechanical glue supply device includes a servo motor, a screw and a glue chamber. The servo motor is used to drive the screw to rotate, thereby squeezing the glue in the glue chamber to flow through the glue tube to the dispensing valve.

5. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The air circuit system includes an air source, a filter, a pressure regulating valve, and a solenoid valve. The air source provides compressed air, which is filtered to remove impurities and its pressure is regulated by the pressure regulating valve. The solenoid valve controls the on / off state of the air, providing power and auxiliary control for the valve core movement of the dispensing valve and the spraying of adhesive.

6. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The dispensing valve and the dispensing needle are connected by threads. A sealing gasket is provided at the threaded connection. The sealing gasket is made of fluororubber and its inner diameter is adapted to the diameter of the dispensing valve outlet, while its outer diameter is adapted to the outer diameter of the dispensing needle connection end.

7. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The blades of the vane flow meter are made of stainless steel, and the surface of the blades is polished. The shape of the blades is arc-shaped.

8. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The dispensing system, glue supply system, and air circuit system under test adopt an integrated positioning and installation structure, which includes a mounting base and positioning slots; the dispensing system, glue supply system, and air circuit system under test are respectively fixed in the corresponding positioning slots.

9. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The overall shell of the testing device is made of aluminum alloy and formed by die casting. The surface of the shell is equipped with heat dissipation fins, which are 30-40mm high and 4-6mm apart, and are distributed in an equally spaced array to enhance the heat dissipation performance of the testing device.

10. The dispensing speed testing device based on fluid dynamics analysis according to claim 1, characterized in that, The computing device is one of a PC, an embedded controller, a programmable logic controller, a microprocessor, or an industrial computer.

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