Glue leakage detection sensor, detector using the sensor and detection method thereof

Abstract

A glue leakage detection sensor is arranged at a glue leakage position to be detected, characterized in that: the glue leakage detection sensor includes a first conductive part, a second conductive part, and an insulating layer arranged between the first conductive part and the second conductive part and electrically isolated from each other, and the glue leakage position to be detected is formed with a glue leakage accommodating cavity that can change the capacitance value between the first conductive part and the second conductive part after pressurization. The advantages of the present invention are: simple structure, low manufacturing cost, easy installation and use, and little interference from external factors; the control circuit adopts the latest capacitance digital conversion integrated chip to replace the traditional capacitance digital conversion circuit, which simplifies the circuit structure, improves the accuracy, and has strong anti-interference ability, ensuring the accuracy and accuracy requirements of the detection.

Description

Technical Field

[0001] The invention relates to a glue leakage detection sensor, in particular to a sensor applicable to glue leakage detection of an injection molding machine and a detector using the sensor, and also includes a detection method of the detector. Background Art

[0002] In the prior art, during the injection molding process of the injection molding machine, due to various reasons (such as mold deformation, flow channel blockage, excessive back pressure or mismatch between the nozzle and the mold, etc.), the plastic will be ejected from the gap of the nozzle or the bearing seat under high speed and high pressure, making it impossible for the rubber to be injected into the mold cavity or overflowing to cause glue leakage; once glue leakage occurs, the glue will stick to the plastic machine, mold, product or hot runner component. If it is not discovered in time, more and more glue will leak, which will not only damage the heating cable and temperature measurement system on the plastic machine heating component or the hot runner component, but also easily lead to problems such as material loss and equipment damage. Moreover, the glue stuck on the equipment is extremely difficult to clean, and excessive glue leakage will scrap the entire injection molding machine head, heating system or hot runner system, and the plastic machine heating system or hot runner system can only be replaced, which is a huge workload and time-consuming, time-consuming, labor-intensive and costly.

[0003] To this end, in response to the above-mentioned glue leakage problem, various glue leakage detection equipment is currently used to detect the glue leakage phenomenon. If glue leakage is found, the user is notified in time to clean it up. Existing Chinese utility model "An intelligent glue leakage detector used on an injection molding machine" with patent number ZL201920859164.8 discloses such a glue leakage detector, whose structure includes a lower shell, an upper shell, a machine connection line and a power light. When the injection molding machine leaks glue, and only the first capillary tube is used for detection, the leaked glue enters the end of the first capillary tube, so that the air sucked into the first ventilation pipe and the first capillary tube by the first air pump cannot be discharged, and the air pressure increases. The first air pressure sensor connected to the first ventilation pipe is sensed, and the sensed information is transmitted to the microprocessor for processing. When the pressure value reaches or exceeds the set value of the first air pressure sensor, at this time, the microprocessor starts the flashing alarm to sound an alarm, prompting the staff, and promptly inspecting and adjusting the injection molding machine. However, the structure of the glue leakage detector in this patent is relatively complex, and the small holes in the capillary tube are easily blocked, thereby affecting the detection accuracy and reliability of use.

[0004] For example, the invention patent "A temperature control alarm device for glue leakage detection" with application number 201910703152.0 and the utility model patent "Injection molding machine nozzle glue leakage detection mechanism" with patent number ZL201921958638.0 both use temperature sensors to perform online detection of the injection molding machine nozzle. When the injection molding machine nozzle leaks glue, the injection molding machine automatically stops working, and the sound and light alarm sounds an alarm. However, the accuracy of the test results obtained by temperature detection is easily affected by the ambient temperature, the test results have large deviations, and the temperature detection method has high requirements for the installation location.

[0005] In summary, the current glue leakage detection methods and equipment still have the above-mentioned problems and need to be further improved and perfected. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a glue leakage detection sensor with a simple structure and reliable detection results in view of the above-mentioned existing technical status.

[0007] The second technical problem to be solved by the present invention is to provide a detector which uses the above-mentioned glue leakage detection sensor and has high detection accuracy in view of the above-mentioned existing technical status.

[0008] The third technical problem to be solved by the present invention is to provide a glue leakage detection method implemented by using the above-mentioned glue leakage detector in view of the above-mentioned existing technical status.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a glue leakage detection sensor is arranged at the glue leakage position to be detected, and is characterized in that: the glue leakage detection sensor includes a first conductive part, a second conductive part, and an insulating layer arranged between the first conductive part and the second conductive part and realizing mutual electrical isolation, and the glue leakage position to be detected is formed with a glue leakage accommodating cavity which can accommodate the leaked glue and causes the capacitance value between the first conductive part and the second conductive part to change after voltage is applied.

[0010] The glue leakage part to be tested is the nozzle. For the convenience of installation, preferably, the first conductive part is a first conductive cylinder sleeved outside the nozzle, and the second conductive part is a second conductive cylinder sleeved outside the first conductive part. The insulating layer is filled between the first conductive cylinder and the second conductive cylinder, and an annular cavity is formed between the first conductive cylinder and the nozzle, and the cavity is the glue leakage accommodating cavity. The second conductive cylinder is connected to the nozzle with the same potential. The conductive part is designed in the shape of a cylinder, which can be conveniently and directly sleeved outside the nozzle for use, and has a simple structure and simple production.

[0011] In order to facilitate the installation and positioning of the sensor, as a further preferred embodiment, a base is formed at the bottom of the nozzle, the nozzle and the base are integrally formed and the cross section is in an inverted T shape, the diameter of the second conductive cylinder piece matches the diameter of the base, the bottom of the second conductive cylinder piece is in direct contact with the base, and the bottom of the first conductive cylinder piece is suspended from the base. The diameter of the second conductive cylinder piece is designed to match the diameter of the base, so that the sensor can be directly limited on the base on the one hand, and the equipotential connection of the second conductive cylinder piece and the base can be achieved on the other hand.

[0012] The glue leakage part to be tested is a cavity composed of a hot runner manifold and a mold frame. In order to save space and facilitate detection, preferably, the first conductive part is a first conductive electrode sheet, and the second conductive part is a hot runner manifold or a mold frame. One side of the insulating sheet is attached to the side wall of the hot runner manifold and / or the inner wall of the mold frame, and the other side of the insulating sheet is attached to the first conductive part. The cavity composed of the hot runner manifold and the mold frame is the glue leakage accommodating cavity.

[0013] In order to improve the accuracy and reliability of detection, as a further preference, one or two or more hot runner nozzles are provided on the hot runner manifold, and at least one first conductive electrode sheet with an insulating sheet is arranged on the side wall of the hot runner manifold and / or the inner wall of the mold frame.

[0014] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a glue leakage detector, characterized in that: the glue leakage detector includes the glue leakage detection sensor as described above, and the glue leakage detector also includes a control circuit electrically connected to the glue leakage detection sensor and performing information collection, analysis and processing on the glue leakage sensor, wherein the control circuit includes a first electrode socket that can be connected to the first conductive part and a second electrode socket connected to the second conductive part, and the glue leakage detection sensor also includes a first wire connecting the first electrode socket and the first conductive part, and a second wire connecting the second electrode socket and the second conductive part.

[0015] The control circuit comprises

[0016] Power supply circuit, providing the power supply voltage for the entire control circuit;

[0017] A capacitance-to-digital conversion circuit, having a signal receiving end and a signal output end, for converting continuous capacitance signal data into data that can be read by a digital device;

[0018] A signal conditioning circuit, having an input end and an output end, the signal conditioning circuit filters and amplifies the collected signal from the glue leakage detection sensor to make it suitable for analog / digital conversion, and the input end includes a first electrode socket and a second electrode socket, and the output end is connected to the signal receiving end of the capacitance digital conversion circuit;

[0019] Alarm circuits to control the alarm outputs of audio-visual equipment; and

[0020] The main control circuit is used to process the circuit information of each functional module. The main control circuit includes a digital signal acquisition terminal, a power input terminal and a trigger terminal. The digital signal acquisition terminal is connected to the signal output terminal of the capacitance digital conversion circuit, the power input terminal is connected to the power circuit, and the trigger terminal is connected to the alarm circuit.

[0021] Preferably, the capacitance-to-digital conversion circuit is a capacitance-to-digital conversion integrated chip of model FDC2212 or FDC2112 or FDC2214 or FDC2114. The advantages of using the capacitance-to-digital conversion integrated chip (FDC2212 or FDC2112 or FDC2214 or FDC2114) are that the peripheral circuit is simple and reliable, the anti-interference ability is strong, and the conversion accuracy is high.

[0022] For the convenience of observation, as a further preference, the control circuit further includes a display circuit capable of setting parameters and displaying contents, and the main control circuit further includes a display control terminal connected to the display circuit.

[0023] The technical solution adopted by the present invention to solve the third technical problem is: a method for detecting glue leakage, characterized in that: the method for detecting glue leakage adopts the above-mentioned glue leakage detector, and the detection method comprises the following steps:

[0024] Step 1: Install the glue leakage detection sensor at the glue leakage position to be detected, and connect the first conductive part and the second conductive part of the glue leakage detection sensor to two electrode sockets of the control circuit via the first wire and the second wire respectively;

[0025] Step 2: Start the control circuit to detect whether the capacitance value between the first conductive part and the second conductive part changes. If yes, proceed to the next step; if no, continue to execute this step;

[0026] Step 3: determine whether the capacitance change value between the first conductive part and the second conductive part exceeds a set capacitance change threshold value, if yes, proceed to the next step; if no, proceed to step 5;

[0027] Step 4: The control circuit sends out an alarm, indicating a glue leakage fault, and the equipment stops working;

[0028] Step 5: The device remains in its original working state and returns to step 3.

[0029] Compared with the prior art, the advantages of the present invention are: the sensor adopts the capacitance principle to realize the glue leakage detection, the overall structure is simple, the manufacturing cost is low, the installation and use are convenient, and the external interference factors are small; secondly, the sensor cooperates with the control circuit to effectively improve the accuracy and reliability of the detection result, and the glue leakage amount can be controlled according to actual needs. When the set threshold is exceeded, an alarm is issued to remind the user, the timeliness is strong, and the detection result is accurate; in addition, the control circuit adopts the latest capacitance digital conversion integrated chip to replace the traditional capacitance digital conversion circuit, which simplifies the circuit structure, improves the accuracy, and has strong anti-interference ability, ensuring the accuracy and accuracy requirements of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional cross-sectional view of the glue leakage detection sensor according to the first embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the glue leakage detection sensor according to the first embodiment of the present invention.

[0032] Figure 3 This is a cross-sectional view of the glue leakage detection sensor in use according to the first embodiment of the present invention.

[0033] Figure 4 This is a usage status diagram of the glue leakage detection sensor according to the first embodiment of the present invention.

[0034] Figure 5 This is a principle block diagram of the control circuit of the glue leakage detector according to the first embodiment of the present invention.

[0035] Figure 6 This is one of the usage state diagrams of the glue leakage detection sensor according to the second embodiment of the present invention.

[0036] Figure 7 This is the second usage state diagram of the glue leakage detection sensor according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings.

[0038] The present application relates to a glue leakage detection sensor and a detector using the sensor. The glue leakage detection sensor is arranged at a glue leakage location to be detected. The glue leakage detection sensor includes a first conductive part, a second conductive part, and an insulating layer arranged between the first conductive part and the second conductive part and electrically isolated from each other. In addition, the glue leakage location to be detected is formed with a glue leakage accommodating cavity that can accommodate leaked glue so that the capacitance value between the first conductive part and the second conductive part changes after voltage is applied (the medium between the two conductive parts changes).

[0039] The glue leakage detection sensor of the present application can be used for various injection molding machine extruders, hot runner mold systems or other systems that need to detect leakage of colloids or liquid substances. The specific shape of the glue leakage detection sensor can be adaptively adjusted according to the different glue leakage detection parts (different shapes and sizes). Its specific structural shape and installation method are also different. Please refer to the following embodiments for details.

[0040] Embodiment 1, as Figure 1 to Figure 5 As shown:

[0041] The present embodiment is applied to an injection molding machine extruder, and the leakage part to be tested is a cylindrical nozzle 1 (injection molding nozzle / nozzle), and a base 2 is formed at the bottom of the nozzle 1. The nozzle 1 and the base 2 are integrally formed and have an inverted T-shaped cross-section. The first conductive part is a first conductive cylinder sheet 31 sleeved outside the nozzle 1, and the second conductive part is a second conductive cylinder sheet 32 ​​sleeved outside the first conductive part. A cylindrical insulating layer 33 is filled between the first conductive cylinder sheet 31 and the second conductive cylinder sheet 32. For the convenience of installation, the first conductive cylinder sheet 31, the insulating layer 33 and the second conductive cylinder sheet 32 ​​of the present embodiment are sequentially attached from the inside to the outside and rolled into a cylindrical shape, and an annular cavity 4 is formed between the first conductive cylinder sheet 31 and the nozzle 1, and the cavity 4 is a leakage accommodating cavity, see Figure 3 , Figure 4 ;

[0042] In order to facilitate the installation and positioning of the sensor, the diameter of the second conductive tube piece 32 matches the diameter of the base 2, the bottom of the second conductive tube piece 32 is in direct contact with the base 2, and the bottom of the first conductive tube piece 31 is suspended on the base 2, that is, the bottom of the first conductive tube piece 31 is not in contact with the base 2; the diameter of the second conductive tube piece 32 is designed to match the diameter of the base 2, on the one hand, the sensor can be directly limited on the base 2, and on the other hand, the equipotential connection between the second conductive tube piece 32 and the base 2 (the base 2 and the nozzle 1) can be achieved.

[0043] The sensor of this embodiment can be directly mounted on the nozzle 1 when in use, and has a simple structure and is easy to manufacture. The diameter of the cylinder of the sensor can be adjusted according to the outer diameter of the base 2 of the nozzle 1 , and the height of the cylinder of the sensor is lower than the injection port 11 of the nozzle 1 .

[0044] like Figure 4As shown, a glue leakage detector using the glue leakage detection sensor of the present embodiment is shown, the glue leakage detector includes a glue leakage detection sensor and a control circuit electrically connected to the sensor, the control circuit is integrated on a circuit board 7, and is used to collect, analyze and process information from the glue leakage sensor, wherein the control circuit includes a first electrode socket 51 and a second electrode socket 52, and the glue leakage detection sensor also includes a first wire 61 and a second wire 62; thus, the first conductive tube piece 31 is connected to the first electrode socket 51 via the first wire 61, and the second conductive tube piece 32 is connected to the second electrode socket 52 via the second wire 62, and after power-on, a certain voltage value is always maintained between the first conductive tube piece 31 and the second conductive tube piece 32.

[0045] The control circuit principle block diagram of this embodiment is as follows Figure 5 As shown, specifically including

[0046] Power supply circuit a1, providing power supply voltage for the entire control circuit;

[0047] The capacitance-to-digital conversion circuit b1 adopts a capacitance-to-digital conversion integrated chip U of model FDC2212 or FDC2112 or FDC2214 or FDC2114. The capacitance-to-digital conversion circuit b1 has a signal receiving end and a signal output end, and is used to convert continuous capacitance signal data into data that can be read by a digital device; wherein, the capacitance-to-digital conversion integrated chip of model FDC2212 is adopted in this embodiment, and the specific connection method of its peripheral circuit is shown in Figure 5 As shown in the dashed box;

[0048] The signal conditioning circuit c1 has an input terminal c11 and an output terminal. The signal conditioning circuit c1 performs filtering and amplification processing on the collected signal from the glue leakage detection sensor to make it suitable for analog / digital conversion. In addition, the input terminal c11 includes a first electrode socket 51 (P1) and a second electrode socket 52 (P2). The output terminal is connected to the signal receiving terminal of the capacitance digital conversion circuit b1.

[0049] Alarm circuit d1 controls the alarm output of the sound and light equipment, and can use alarm equipment such as LED lights or sirens to achieve alarm output;

[0050] Display circuit e1 can set parameters and display content, and adopts digital tube display screen to facilitate users to observe parameter changes;

[0051] The main control circuit (single-chip microcomputer) f1 is used to process the circuit information of each functional module. The main control circuit includes a display control terminal, a digital signal acquisition terminal, a power input terminal and a trigger terminal. The display control terminal is connected to the display circuit, the digital signal acquisition terminal is connected to the signal output terminal of the capacitor digital conversion circuit b1, the power input terminal is connected to the power circuit a1, and the trigger terminal is connected to the alarm circuit d1.

[0052] The capacitance-to-digital conversion circuit b1 of this embodiment adopts the latest capacitance-to-digital conversion integrated chip. Compared with the traditional digital conversion circuit, the integrated chip has the advantages of simple and reliable peripheral circuit, strong anti-interference ability and high conversion accuracy. The integrated chip also has a sensor backup channel interface, which can be conveniently connected to another sensor backup circuit g1 for use.

[0053] Each circuit functional module in the above control circuit (power supply circuit a1, signal conditioning circuit c1, alarm circuit d1, display circuit and main control circuit) can be implemented using existing functional circuits in the prior art. The specific circuit structure belongs to the prior art and will not be elaborated here.

[0054] The working principle of the glue leakage detector in this embodiment is:

[0055] Install the glue leakage detection sensor on the nozzle 1, ensure that the second conductive cylinder 32 is in contact with the base 2, the first conductive cylinder 31 is connected to the first electrode socket 51 of the control circuit via the first wire 61, and the second conductive cylinder 32 is connected to the second electrode socket 52 of the control circuit via the second wire 62;

[0056] After power is turned on, the second conductive cylinder sheet 32, the base 2 and the nozzle 1 are connected at the same potential to form the first electrode of the capacitor, and the first conductive cylinder sheet 31 becomes the second electrode of the capacitor. The first conductive cylinder sheet 31 is isolated from the second conductive cylinder sheet 32 ​​by the insulating layer 33. At the beginning, the medium between the first conductive cylinder sheet 31 and the nozzle 1 is air, which is the initial capacitance value. When glue leaks out, the cavity 4 (i.e., the glue leakage accommodating cavity) between the first conductive cylinder sheet 31 and the nozzle 1 will be filled with the glue leakage medium, the medium between the two electrodes changes, and the capacitance value changes. When the capacitance value change reaches the set threshold, the alarm device is activated to prompt a glue leakage warning.

[0057] Embodiment 2, as Figure 6 , Figure 7 As shown:

[0058] The application scenario of this embodiment is a hot runner mold. Considering the limited space near the hot runner nozzle, it is impossible to directly mount the cylindrical sensor in the first embodiment outside the hot runner nozzle. The leakage position to be measured in this embodiment is set in the cavity 9 composed of the hot runner diverter plate 71 and the mold frame 72. Therefore, the first conductive part of this embodiment is set as the first conductive electrode sheet 81, and the second conductive part is directly replaced by the hot runner diverter plate 71 and / or the mold frame 72 (the hot runner diverter plate 71 and the mold frame 72 are in contact with each other, and the two are at the same potential). The insulating layer adopts an insulating sheet 82 that is matched with the size of the first conductive electrode sheet 81. One side of the insulating sheet 82 can be directly attached to the side wall of the hot runner diverter plate 71 or the inner wall of the mold frame 72, and the other side of the insulating sheet 82 is attached with the first conductive part. The cavity 9 composed of the hot runner diverter plate 71 and the mold frame 72 is the leakage accommodating cavity.

[0059] like Figure 6 As shown, it is an application scenario in which one side of the insulating sheet 82 is attached to the side wall of the hot runner manifold 71, such as Figure 7 As shown, it is an application scenario that one side of the insulating sheet 82 is attached to the inner wall of the mold frame 72; in either case, the first conductive portion is arranged on the other side of the insulating sheet 82, and the second conductive portion is replaced by the hot runner manifold 71 or the mold frame 72, and the first conductive electrode sheet 81 and the hot runner manifold 71 (or the mold frame 72) are respectively connected to the first electrode socket 51 and the second electrode socket 52 of the control circuit through wires.

[0060] In actual applications, one or more hot runner nozzles 73 are usually provided on the hot runner manifold 71, and the shape of the cavity 9 can be various. During installation, in order to improve the accuracy and reliability of detection, at least one or more first conductive electrode sheets 81 with insulating sheets 82 can be arranged on the side walls of the hot runner manifold 71 and / or the inner walls of the mold frame 72. Specifically, there are a total of 6 first conductive electrode sheets 81 with insulating sheets 82 in this embodiment, which are distributed at different positions in the cavity 9 (on the side walls of the hot runner manifold 71 and / or the inner walls of the mold frame 72) to ensure the sensitivity and reliability of detection.

[0061] The working principle of the glue leakage detector using the glue leakage detection sensor of this embodiment is the same as that of the first embodiment, and the control circuit principle adopted is also the same, which will not be described in detail here.

[0062] After power is turned on, the first conductive electrode sheet 81 is the first electrode of the capacitor, and the hot runner manifold plate 71 and / or the mold frame 72 are the second electrode of the capacitor. In the initial state, the cavity 9 (i.e., the leaking glue accommodating cavity) is filled with air, which is the initial capacitance value. When the leaked glue flows out and enters the cavity 9, the medium between the two electrodes changes, and the capacitance value changes. When the capacitance value change reaches the set threshold, the alarm device is activated to prompt a glue leakage warning.

[0063] The glue leakage detection method implemented by the glue leakage detector of the above-mentioned embodiment 1 and embodiment 2 includes the following steps:

[0064] Step 1: Install the glue leakage detection sensor at the glue leakage position to be detected, and connect the first conductive part and the second conductive part of the glue leakage detection sensor to the first electrode socket and the second electrode socket of the control circuit respectively through wires;

[0065] Step 2: Start the control circuit to detect whether the capacitance C between the first conductive part and the second conductive part changes. If yes, proceed to the next step; if no, continue to execute this step;

[0066] Step 3: determine whether the capacitance change value ΔC between the first conductive part and the second conductive part exceeds the set capacitance change threshold Ct, if yes, proceed to the next step; if no, proceed to step 5;

[0067] Step 4: The control circuit sends out an alarm, indicating a glue leakage fault, and the equipment stops working;

[0068] Step 5: The device remains in its original working state and returns to step 3.

Claims

1. A glue leakage detection sensor, arranged at the glue leakage position to be detected, characterized in that: The glue leakage detection sensor comprises a first conductive part, a second conductive part, and an insulating layer arranged between the first conductive part and the second conductive part and electrically isolating each other, and a glue leakage accommodating cavity is formed at the glue leakage part to be detected, which can accommodate the leaked glue and change the capacitance value between the first conductive part and the second conductive part after voltage is applied; The glue leakage part to be detected is the nozzle (1), the first conductive part is a first conductive tube sheet (31) sleeved outside the nozzle (1), the second conductive part is a second conductive tube sheet (32) sleeved outside the first conductive part, the insulating layer is filled between the first conductive tube sheet (31) and the second conductive tube sheet (32), and an annular cavity (4) is formed between the first conductive tube sheet (31) and the nozzle (1), the cavity (4) being the glue leakage accommodating cavity, and the second conductive tube sheet (32) is connected to the nozzle (1) at the same potential; A base (2) is also formed at the bottom of the nozzle (1); the nozzle (1) and the base (2) are integrally formed and have an inverted T-shaped cross section; the diameter of the second conductive tube sheet (32) matches the diameter of the base (2); the bottom of the second conductive tube sheet (32) is in direct contact with the base (2); and the bottom of the first conductive tube sheet (31) is suspended from the base (2).

2. A glue leakage detection sensor, arranged at the glue leakage position to be detected, characterized in that: The glue leakage detection sensor comprises a first conductive part, a second conductive part, and an insulating layer arranged between the first conductive part and the second conductive part and electrically isolating each other, and a glue leakage accommodating cavity is formed at the glue leakage part to be detected, which can accommodate the leaked glue so that the capacitance value between the first conductive part and the second conductive part changes after voltage is applied, the glue leakage part to be detected is a cavity (9) composed of a hot runner manifold (71) and a mold frame (72), the first conductive part is a first conductive electrode sheet (81), and the second conductive part is a hot runner manifold (71) and / or a mold frame (72), One side of the insulating sheet (82) is attached to the side wall of the hot runner manifold (71) and / or the inner wall of the mold frame (72), and the other side of the insulating sheet (82) is attached to the first conductive part. The mold cavity (9) formed by the hot runner manifold (71) and the mold frame (72) is the leaking glue accommodating cavity; one or two or more hot runner nozzles (73) are arranged on the hot runner manifold (71), and at least one first conductive electrode sheet (81) with an insulating sheet (82) is arranged on the side wall of the hot runner manifold (71) and / or the inner wall of the mold frame (72).

3. A glue leakage detector, characterized in that: The glue leakage detector comprises the glue leakage detection sensor as claimed in claim 1, and the glue leakage detector also comprises a control circuit electrically connected to the glue leakage detection sensor and performing information collection, analysis and processing on the glue leakage detection sensor, wherein the control circuit comprises a first electrode socket (51) connectable to a first conductive part and a second electrode socket (52) connected to a second conductive part, and the glue leakage detection sensor also comprises a first wire connecting the first electrode socket (51) and the first conductive part, and a second wire connecting the second electrode socket (52) and the second conductive part.

4. The glue leakage detector according to claim 3, characterized in that: The control circuit comprises A power supply circuit (a1) provides the power supply voltage for the entire control circuit; A capacitance-to-digital conversion circuit (b1) has a signal receiving end and a signal output end, and is used to convert continuous capacitance signal data into data that can be read by a digital device; A signal conditioning circuit (c1) having an input end and an output end, the signal conditioning circuit (c1) performs filtering and amplification processing on the collected signal from the glue leakage detection sensor to make it suitable for analog / digital conversion, and the input end includes the first electrode socket (51) and the second electrode socket (52), and the output end is connected to the signal receiving end of the capacitance digital conversion circuit (b1); an alarm circuit (d1) for controlling the alarm output of the sound and light equipment; and The main control circuit (f1) is used to process circuit information of each functional module. The main control circuit (f1) comprises a digital signal acquisition terminal, a power input terminal and a trigger terminal. The digital signal acquisition terminal is connected to the signal output terminal of the capacitance digital conversion circuit (b1), the power input terminal is connected to the power circuit (a1), and the trigger terminal is connected to the alarm circuit (d1).

5. The glue leakage detector according to claim 4, characterized in that: The capacitance-to-digital conversion circuit (b1) is a capacitance-to-digital conversion integrated chip with a model number of FDC2212 or FDC2112 or FDC2214 or FDC2114.

6. The glue leakage detector according to claim 4, characterized in that: The control circuit also includes a display circuit (e1) capable of setting parameters and displaying contents, and the main control circuit (f1) also includes a display control terminal connected to the display circuit (e1).

7. A method for detecting glue leakage, characterized in that: The glue leakage detection method adopts the glue leakage detector as claimed in any one of claims 3 to 6, and the detection method includes the following steps: Step 1: Install the glue leakage detection sensor at the glue leakage position to be detected, and connect the first conductive part and the second conductive part of the glue leakage detection sensor to two electrode sockets of the control circuit via the first wire and the second wire respectively; Step 2: Start the control circuit to detect whether the capacitance value between the first conductive part and the second conductive part changes. If yes, proceed to the next step; if no, continue to execute this step; Step 3: determine whether the capacitance change value between the first conductive part and the second conductive part exceeds a set capacitance change threshold value, if yes, proceed to the next step; if no, proceed to step 5; Step 4: The control circuit sends out an alarm, indicating a glue leakage fault, and the equipment stops working; Step 5: The device remains in its original working state and returns to step 3.

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