Electric heating rubber guide cylinder and production process and temperature control system thereof

Abstract

The electric heating rubber guide cylinder comprises a guide cylinder body, and a self-temperature-limiting electric heating film is arranged in the middle of the interior of the guide cylinder body; the production process comprises the following steps: S1, designing an electrode of a self-temperature-limiting electrothermal film; s2, etching a copper electrode; s3, designing a heating film resistor; s4, press-fit forming is carried out; s5, digging a welding hole; s6, welding a power line; s7, carrying out insulation treatment; s8, testing electrical performance; s9, pasting a double faced adhesive tape; s10, the self-temperature-limiting electrothermal film is fixed to the aluminum plate; the preparation method of the guide cylinder body comprises the following steps: A1, preparing a sizing material; a2, mold preheating; a3, cleaning an electric heating sheet; a4, brushing glue on the electric heating sheet; a5, cutting the rubber material; a6, adhering the sizing material; a7, mold embedding; a8, demolding is conducted; a temperature control system of an electric heating rubber guide cylinder comprises an electric heating sheet, a temperature sensor, a temperature controller, a power supply module and a display alarm module. The device has the advantages of integrity, sealing performance, heating uniformity and temperature control accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating rubber guide barrels, and in particular to an electric heating rubber guide barrel, a production process and a temperature control system thereof. Background Art

[0002] Electric heating rubber guide is a device used for heating, heat preservation and temperature control in the process of rubber and plastic processing. It is widely used in rubber vulcanization, plastic extrusion, heat treatment, textile shaping and other industries. The device is usually composed of heating elements, rubber materials, temperature sensors and control systems. Its main function is to convert electrical energy into thermal energy and evenly transfer heat to rubber or other materials, so as to meet the precise temperature control requirements during the processing.

[0003] With the continuous development of industrial technology, especially the improvement of high precision, energy saving and environmental protection requirements, the application scope of electric heating rubber guide barrels has gradually expanded, and the requirements for its heating efficiency and temperature control accuracy have also increased. In order to ensure product quality and the stability of the production process, the temperature control system of the electric heating rubber guide barrel is particularly important. An effective temperature control system can not only improve product quality, but also reduce energy consumption, extend the service life of equipment, and improve production efficiency to a certain extent.

[0004] The existing electric heating rubber guide tube is composed of silicone rubber vulcanized carbon fiber heating wire, and the carbon fiber heating wire is evenly spirally wound inside the electric heating rubber guide tube, resulting in uneven heating temperature inside the electric heating rubber guide tube. As a result, the electric heating rubber guide tube cannot evenly conduct heat to the rubber or other materials when in use, and cannot meet the requirements for precise temperature control during the processing. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an electric heating rubber guide tube and its production process and temperature control system

[0006] The object of the present invention is achieved as follows: an electric heating rubber guide sleeve comprises a guide sleeve body, a self-limiting temperature electric heating film is arranged in the middle of the interior of the guide sleeve body, an outlet pipe is connected to one side of the guide sleeve body, connecting rings are fixedly arranged on the outer sides of the upper and lower ends of the guide sleeve body, and reinforcing strips and reinforcing rings are fixedly arranged on the outer surface of the guide sleeve body.

[0007] Specifically, a fixing seat is fixedly provided on one side of the guide tube body, the outlet pipe is embedded in the interior of the fixing seat, and the outlet pipe is in contact with the outer side of the self-limiting temperature electric heating film.

[0008] Specifically, the guide tube body includes an outer layer body and an inner layer body, the self-limiting temperature electric heating film is embedded between the outer layer body and the inner layer body, and the outer layer body and the inner layer body are integrally formed by vulcanization.

[0009] Specifically, the self-limiting temperature electric heating film includes a pI strip electrode, a heating film and a pI film, the pI strip electrode is electrically connected to a power line, the pI strip electrode is arranged on the upper surface of the pI film, the heating film is arranged on the upper surface of the pI strip electrode, and the pI strip electrode, the heating film and the pI film are pressed into shape.

[0010] A production process of an electric heating rubber guide tube, including the production process of a self-limiting temperature electric heating film and a guide tube body:

[0011] The production steps of the self-limiting temperature electric heating film are as follows:

[0012] S1. Design the electrodes of the self-limiting temperature electric heating film: confirm the position of the pI band electrode according to the set requirements;

[0013] S2, copper electrode etching: etching the electrode copper sheet to form a pI band electrode;

[0014] S3. Design heating film resistance: Calculate the resistance value of the heating film according to the set requirements;

[0015] S4, pressing and forming: pressing and forming the pI strip electrode, the heating film and the pI film to form a self-limiting temperature electric heating film;

[0016] S5, picking out welding holes: picking out welding holes at the electrode pads of the self-limiting temperature electric heating film;

[0017] S6. Welding power line: Weld a suitable power line at the welding hole;

[0018] S7, insulation treatment: perform silicone sealing on the welding part of the power line of the self-limiting temperature electric heating film, and perform insulation treatment on the welding part of the power line;

[0019] S8. Electrical performance test: Conduct electrical performance test on the self-limiting temperature electric heating film to test leakage, voltage, current, temperature, voltage peak, current peak and power of the self-limiting temperature electric heating film;

[0020] S9, sticking double-sided tape: stick double-sided tape on both sides of the self-limiting temperature electric heating film;

[0021] S10, fixing the self-limiting temperature electric heating film on the aluminum plate: the aluminum plate is attached to both sides of the self-limiting temperature electric heating film by double-sided tape and fixed by rivets to prepare an electric heating sheet.

[0022] Specifically, the heating film in S3 is a conductive film made by adding conductive carbon black to polyolefin and mixing the two through a film blowing process to form a conductor used as a bridge for the heating element. As the temperature of the heating film changes, the polymer in the bridge expands and contracts, causing the current to change, so the calorific value will also change with the temperature change.

[0023] When the temperature of the heating film is low, the bridging polymer shrinks, more current flows, and thus the heat generation increases; on the contrary, when the temperature is high, the bridging polymer itself expands, the current flows less, and the heat generation also decreases.

[0024] Specifically, the production steps of the guide tube body are as follows:

[0025] A1. Prepare the rubber: Take out the rubber and re-refine it before use;

[0026] A2. Mold preheating: Take out the mold, clean the inner surface of the mold, and then push the mold into the vulcanizer for preheating;

[0027] A3. Clean the electric heating plate: wipe the surface of the electric heating plate with 120# gasoline, remove the dust and oil on the surface of the aluminum plate and dry it;

[0028] A4. Glue the electric heating plate: Evenly apply adhesive on the aluminum plate surface of the electric heating plate and the inner surface of the mold, let it dry and set aside;

[0029] A5. Cutting rubber: Cut the rubber into sheets of 420mm*160mm and 420mm*180mm. Take 2 sheets of each size and weigh them together with the scraps to 2000±5g for later use.

[0030] A6. Adhesion of adhesive: First, stick adhesive sheets with a width of 160 mm on the inner surface of the electric heating sheet, and then stick adhesive sheets with a width of 180 mm on the outer surface of the electric heating sheet, and wait for use;

[0031] A7. Embed the mold: put one of the electric heating sheets with adhesive into the mold cavity of the lower mold, then place the mold core inside the electric heating sheet, and then put another electric heating sheet with adhesive on the upper surface of the mold core, then close the upper mold and the lower mold, and then send the closed mold into the vulcanizer, press it up, and return air 2-3 times;

[0032] A8. Demolding: After the vulcanization time is reached, the guide tube body is demoulded, and the mold core inside the guide tube body is taken out to complete the production of the guide tube body.

[0033] Specifically, in A7, the scraps are placed in the square mold cavity at the wire outlet, and then the wire outlet tube is placed, the center position of the wire outlet tube is kept fixed, and when the upper mold and the lower mold are closed, the wire outlet tube is fixed by the scraps, and finally the power cord on the electric heating plate is passed through the wire outlet tube and straightened after passing through.

[0034] A temperature control system for an electric heating rubber guide tube, comprising an electric heating plate, a temperature sensor, a temperature controller, a power module and a display alarm module;

[0035] The electric heating plate is used to achieve heating, so that when the temperature of the electric heating plate is low, the cross-linking polymer shrinks, more current flows, and thus the heat generation increases; on the contrary, when the temperature is high, the cross-linking polymer itself expands, the current flows less, and the heat generation also decreases;

[0036] The temperature sensor is used to detect the temperature inside the electric heating rubber guide sleeve;

[0037] The temperature controller is used to adjust and control the electric heating plate through the temperature collected by the temperature sensor, and control the power on and off of the electric heating plate according to the temperature information fed back by the temperature sensor;

[0038] The power module is used to provide stable power output to the electric heating plate to ensure the heating requirements of the system;

[0039] The display alarm module is used to display the current temperature through a digital display and provide a temperature alarm function. When the temperature exceeds the set range, it will remind the operator to take corresponding measures.

[0040] Specifically, the temperature control calculation of the electric heating plate is as follows:

[0041] Assume that the thermal expansion coefficient of the heating film is , the length of the material is L and the cross-sectional area is A, the temperature changes The change in time is expressed as:

[0042] ,

[0043] in, and are the initial length and cross-sectional area of ​​the heating film respectively;

[0044] The change in resistance is expressed as:

[0045] ,

[0046] Resistivity The change with temperature is expressed by the following formula:

[0047] ,

[0048] in, Expressed as temperature The resistivity under Indicated as reference temperature The resistivity under

[0049] Expressed as the temperature coefficient of the material, Expressed as actual temperature, It is indicated as reference temperature;

[0050] The algorithm used by the temperature controller is PID regulation, and the specific calculation formula is as follows:

[0051] ;

[0052] in, is the proportional gain, is the integral gain, which accumulates past errors and eliminates steady-state errors. is the differential gain, the differential part predicts the change of error and reduces system oscillation, is the current error, calculated by the following formula:

[0053] ,in, is the actual temperature collected, is the reference temperature .

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention realizes uniform heating of the guide tube body by inlaying and installing a self-limiting temperature electric heating film inside the guide tube body, directly heating the internal heating area of ​​the guide tube body, and the heated guide tube body can transfer heat to the material by heat conduction, so that the material reaches the required temperature for subsequent processing;

[0056] The heating film uses conductive carbon black added to polyolefin. The conductor made by mixing the two is used as the bridge of the heating element. When the temperature of the heating element is low, the bridge polymer shrinks and more current flows, so the heat generation increases. On the contrary, when the temperature is high, the bridge polymer expands, the current flow decreases, and the heat generation also decreases.

[0057] During the processing, the pI strip electrode, the heating film and the pI film are pressed and formed to improve the stable adhesion of the self-limiting temperature electric heating film, and the self-limiting temperature electric heating film is pressed by the aluminum plate, which is convenient for the rubber to be embedded and integrated with the electric heating sheet, thereby improving the integrity of the guide tube body;

[0058] The temperature of the electric heating plate inside the guide tube body is controlled by a temperature sensor and a temperature controller. The temperature collected by the temperature sensor is used to adjust and control the electric heating plate. According to the temperature information fed back by the temperature sensor, the power on and off of the electric heating plate is controlled to adjust and control the temperature of the electric heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0060] Figure 1 It is a schematic diagram of the structure of the present invention;

[0061] Figure 2 is a cross-sectional schematic diagram of the present invention;

[0062] Figure 3 It is a schematic diagram of the structure of the self-limiting temperature electric heating film of the present invention;

[0063] Figure 4 It is a schematic diagram of the production process of the self-limiting temperature electric heating film of the present invention;

[0064] Figure 5 It is a schematic diagram of the production process of the guide cylinder body of the present invention;

[0065] Figure 6 It is a schematic diagram of the structure of the temperature control system of the present invention;

[0066] Figure 7 It is a test data schematic diagram of the electric heating rubber guide tube of the present invention;

[0067] Figure 8 It is a power curve diagram of the electric heating rubber guide tube of the present invention.

[0068] In the figure, 1, guide tube body; 101, outer layer body; 102, inner layer body; 2, connecting ring; 3, outlet pipe; 4, self-limiting temperature electric heating film; 401, pI film; 402, pI band electrode; 403, heating film; 404, power cord; 5, fixing seat; 6, reinforcement ring; 7, reinforcement strip. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] like Figure 1-3An electric heating rubber guide sleeve as shown in 7-8 includes a guide sleeve body 1, a self-limiting temperature electric heating film 4 is arranged in the middle of the inner part of the guide sleeve body 1, an outlet pipe 3 is connected to one side of the guide sleeve body 1, connecting rings 2 are fixedly arranged on the outer sides of the upper and lower ends of the guide sleeve body 1, and a reinforcing strip 7 and a reinforcing ring 6 are fixedly arranged on the outer surface of the guide sleeve body 1.

[0071] In this embodiment, preferably, a fixing seat 5 is fixedly provided on one side of the guide tube body 1, and the outlet pipe 3 is embedded in the inside of the fixing seat 5, and the outlet pipe 3 is in contact with the outer side of the self-limiting temperature electric heating film 4;

[0072] It should be noted that the setting of the fixing seat 5 facilitates the installation and connection of the guide tube body 1 and improves the stable snap-fit ​​connection, and the setting of the outlet tube 3 is used to realize the threading and protection of the power line 404.

[0073] In this embodiment, preferably, the guide tube body 1 includes an outer layer body 101 and an inner layer body 102, the self-limiting temperature electric heating film 4 is embedded between the outer layer body 101 and the inner layer body 102, and the outer layer body 101 and the inner layer body 102 are integrally formed by vulcanization;

[0074] It should be noted that the setting of the outer layer 101 and the inner layer 102 facilitates the inlay installation of the self-limiting temperature electric heating film 4, and the outer layer 101 and the inner layer 102 are vulcanized and integrally formed, which can improve integrity and sealing.

[0075] In this embodiment, preferably, the self-limiting temperature electric heating film 4 includes a pI strip electrode 402, a heating film 403 and a pI film 401, the pI strip electrode 402 is electrically connected to a power line 404, the pI strip electrode 402 is arranged on the upper surface of the pI film 401, the heating film 403 is arranged on the upper surface of the pI strip electrode 402, and the pI strip electrode 402, the heating film 403 and the pI film 401 are pressed together;

[0076] It should be noted that the pI band electrode 402, the heating film 403 and the pI film 401 are pressed together to improve the integrity.

[0077] refer to Figure 4-5 A production process of an electric heating rubber guide sleeve includes the production process of a self-limiting temperature electric heating film 4 and a guide sleeve body 1:

[0078] The production steps of the self-limiting temperature electric heating film 4 are as follows:

[0079] S1. Design the electrodes of the self-limiting temperature electric heating film 4: confirm the position of the pI band electrode 402 according to the set requirements;

[0080] S2, copper electrode etching: etching the electrode copper sheet to form a pI band electrode 402;

[0081] S3. Design heating film resistance: Calculate the resistance value of the heating film 403 according to the set requirements;

[0082] S4, pressing and forming: pressing and forming the pI strip electrode 402, the heating film 403 and the pI film 401 to form a self-limiting temperature electric heating film 4;

[0083] S5, picking out welding holes: picking out welding holes at the electrode pads of the self-limiting temperature electric heating film 4;

[0084] S6, welding power line 404: welding a suitable power line 404 at the welding hole;

[0085] S7, insulation treatment: perform silicone sealing on the welding part of the power line 404 of the self-limiting temperature electric heating film 4, and perform insulation treatment on the welding part of the power line 404;

[0086] S8, electrical performance test: perform electrical performance test on the self-limiting temperature electric heating film 4, and test the leakage, voltage, current, temperature, voltage peak, current peak and power of the self-limiting temperature electric heating film 4;

[0087] S9, pasting double-sided tape: pasting double-sided tape on both sides of the self-limiting temperature electric heating film 4;

[0088] S10, fixing the self-limiting temperature electric heating film 4 on the aluminum plate: the aluminum plate is attached to both sides of the self-limiting temperature electric heating film 4 by double-sided adhesive, and fixed by rivets to prepare an electric heating sheet;

[0089] It should be noted that the production of the self-limiting temperature electric heating film 4 is convenient for improving the integrity of the self-limiting temperature electric heating film 4, and the strength of the self-limiting temperature electric heating film 4 can be improved by setting the aluminum plate, so that the self-limiting temperature electric heating film 4 can be easily embedded in the interior of the guide tube body 1.

[0090] In this embodiment, preferably, the heating film 403 in S3 is a conductor made by adding conductive carbon black to polyolefin and mixing the two through a film blowing process to bridge the heating element, and as the temperature of the heating film 403 changes, the polymer in the bridge expands and contracts, causing the current to change, so the calorific value will also change with the temperature change;

[0091] When the temperature of the heating film 403 is low, the cross-linking polymer shrinks, and more current flows, so the heat generation increases; on the contrary, when the temperature is high, the cross-linking polymer expands, the current flows less, and the heat generation also decreases;

[0092] It should be noted that by adding conductive carbon black to polyolefin, the bridging can adjust the calorific value according to the change of temperature, thereby realizing the control and regulation of the calorific value.

[0093] In this embodiment, preferably, the production steps of the guide tube body 1 are as follows:

[0094] A1. Prepare the rubber: Take out the rubber and re-refine it before use;

[0095] A2. Mold preheating: Take out the mold, clean the inner surface of the mold, and then push the mold into the vulcanizer for preheating;

[0096] A3. Clean the electric heating plate: wipe the surface of the electric heating plate with 120# gasoline, remove the dust and oil on the surface of the aluminum plate and dry it;

[0097] A4. Glue the electric heating plate: Evenly apply adhesive on the aluminum plate surface of the electric heating plate and the inner surface of the mold, let it dry and set aside;

[0098] A5. Cutting rubber: Cut the rubber into sheets of 420mm*160mm and 420mm*180mm. Take 2 sheets of each size and weigh them together with the scraps to 2000±5g for later use.

[0099] A6. Adhesion of adhesive: First, stick adhesive sheets with a width of 160 mm on the inner surface of the electric heating sheet, and then stick adhesive sheets with a width of 180 mm on the outer surface of the electric heating sheet, and wait for use;

[0100] A7. Embed the mold: put one of the electric heating sheets with adhesive into the mold cavity of the lower mold, then place the mold core inside the electric heating sheet, and then put another electric heating sheet with adhesive on the upper surface of the mold core, then close the upper mold and the lower mold, and then send the closed mold into the vulcanizer, press it up, and return air 2-3 times;

[0101] A8. Demolding: After the vulcanization time is reached, the guide tube body 1 is demoulded, and the mold core in the guide tube body 1 is taken out to complete the production of the guide tube body 1;

[0102] It should be noted that by vulcanizing the guide tube body 1, the integrity and sealing of the guide tube body 1 can be improved, and it is convenient to embed the electric heating plate, thereby improving the integrity of the entire device.

[0103] In this embodiment, preferably, in A7, the scraps are placed in the square mold cavity at the outlet, and then the outlet tube 3 is placed, the center position of the outlet tube 3 is kept fixed, and when the upper mold and the lower mold are molded together, the outlet tube 3 is fixed by the scraps, and finally the power line 404 on the electric heating plate is passed through the outlet tube 3 and straightened after passing through;

[0104] It should be noted that the setting of the square mold cavity facilitates the casting of the fixing seat 5 , and during the casting process, the centrality of the outlet pipe 3 is maintained to facilitate the insertion of the power cord 404 .

[0105] refer to Figure 6 , a temperature control system for an electric heating rubber guide tube, comprising an electric heating plate, a temperature sensor, a temperature controller, a power module and a display alarm module;

[0106] The electric heating sheet is used to achieve heating. When the temperature of the electric heating sheet is low, the cross-linking polymer shrinks, and more current flows, so the heat generation increases; on the contrary, when the temperature is high, the cross-linking polymer expands, the current flows less, and the heat generation also decreases;

[0107] The temperature sensor is used to detect the temperature inside the electric heating rubber guide tube;

[0108] The thermostat is used to adjust and control the electric heating plate through the temperature collected by the temperature sensor, and control the power on and off of the electric heating plate according to the temperature information fed back by the temperature sensor;

[0109] The power module is used to provide stable power output to the electric heating plate to ensure the heating needs of the system;

[0110] The display alarm module is used to display the current temperature through a digital display and provide a temperature alarm function. When the temperature exceeds the set range, it will remind the operator to take appropriate measures.

[0111] In this embodiment, preferably, the temperature control calculation of the electric heating plate is as follows:

[0112] Assume that the thermal expansion coefficient of the heating film is , the length of the material is L and the cross-sectional area is A, the temperature changes The change in time is expressed as:

[0113] ,

[0114] in, and are the initial length and cross-sectional area of ​​the heating film respectively;

[0115] The change in resistance is expressed as:

[0116] ,

[0117] Resistivity The change with temperature is expressed by the following formula:

[0118] ,

[0119] in, Expressed as temperature The resistivity under Indicated as reference temperature The resistivity under

[0120] Expressed as the temperature coefficient of the material, Expressed as actual temperature, It is indicated as reference temperature;

[0121] The algorithm used by the temperature controller is PID adjustment. The specific calculation formula is as follows:

[0122] ;

[0123] in, is the proportional gain, is the integral gain, which accumulates past errors and eliminates steady-state errors. is the differential gain, the differential part predicts the change of error and reduces system oscillation, is the current error, calculated by the following formula:

[0124] ,in, is the actual temperature collected, is the reference temperature ;

[0125] It should be noted that the calculation formula is used to calculate the heating film, which facilitates the setting of the heating film, and the heating film is controlled and adjusted through PID adjustment.

[0126] The specific operation process of this application:

[0127] Step 1: Design the electrode of the self-limiting temperature electric heating film 4: confirm the position of the pI band electrode 402 according to the setting requirements;

[0128] Step 2, copper electrode etching: etching the electrode copper sheet to form a pI band electrode 402;

[0129] Step 3, design the heating film resistance: Calculate the resistance value of the heating film 403 according to the set requirements. The heating film 403 is made by adding conductive carbon black to polyolefin. The conductive body made by mixing the two through a film blowing process is used as a bridge for the heating element. As the temperature of the heating film 403 changes, the polymer in the bridge expands and contracts, causing the current to change. Therefore, the calorific value will also change with the temperature change.

[0130] When the temperature of the heating film 403 is low, the cross-linking polymer shrinks, and more current flows, so the heat generation increases; on the contrary, when the temperature is high, the cross-linking polymer expands, the current flows less, and the heat generation also decreases;

[0131] Step 4: Pressing and forming: Pressing and forming the pI strip electrode 402, the heating film 403 and the pI film 401 to form a self-limiting temperature electric heating film 4;

[0132] Step 5, pick out the welding hole: pick out the welding hole at the electrode pad of the self-limiting temperature electric heating film 4;

[0133] Step 6, welding the power line 404: welding a suitable power line 404 at the welding hole;

[0134] Step 7, insulation treatment: perform silicone sealing on the welding part of the power line 404 of the self-limiting temperature electric heating film 4, and perform insulation treatment on the welding part of the power line 404;

[0135] Step 8, electrical performance test: perform electrical performance test on the self-limiting temperature electric heating film 4, and test the leakage, voltage, current, temperature, voltage peak, current peak and power of the self-limiting temperature electric heating film 4;

[0136] Step nine, sticking double-sided tape: stick double-sided tape on both sides of the self-limiting temperature electric heating film 4;

[0137] Step 10, fix the self-limiting temperature electric heating film 4 on the aluminum plate: stick the aluminum plate on both sides of the self-limiting temperature electric heating film 4 with double-sided tape, and fix it with rivets to prepare an electric heating sheet;

[0138] Step 11: Prepare the rubber: Take out the rubber and re-refine it before use;

[0139] Step 12: Preheating the mold: Take out the mold, clean the inner surface of the mold, and then push the mold into the vulcanizer for preheating;

[0140] Step 13: Clean the electric heating plate: wipe the surface of the electric heating plate with 120# gasoline, remove dust and oil on the surface of the aluminum plate and dry it;

[0141] Step 14: Brush glue on the electric heating plate: Brush the adhesive evenly on the aluminum plate surface of the electric heating plate and the inner surface of the mold, let it dry, and then set aside;

[0142] Step 15: Cutting the rubber material: Cut the rubber material into films with specifications of 420mm*160mm and 420mm*180mm. Take 2 pieces of each of the two specifications of film and add the scraps and weigh them together to 2000±5g for standby use;

[0143] Step 16: Glue bonding: firstly, stick the 160mm wide glue sheets on the inner surface of the electric heating sheet, and then stick the 180mm wide glue sheets on the outer surface of the electric heating sheet, and then wait for use;

[0144] Step 17: Embed the mold: Place one of the electric heating sheets with adhesive paste into the mold cavity of the lower mold, then place the mold core inside the electric heating sheet, and then place another electric heating sheet with adhesive paste on the upper surface of the mold core, and then close the upper mold with the lower mold, and then send the closed mold into the vulcanizer, press it up, and return air 2-3 times;

[0145] Step 18, demoulding: after the vulcanization time is reached, the guide tube body 1 is demoulded, and the mold core in the guide tube body 1 is taken out, thereby completing the production of the guide tube body 1;

[0146] And the temperature control and adjustment of the electric heating plate;

[0147] When in use, the power module is used to supply power to the electric heating plate, so that the electric heating plate is heated. When the temperature of the electric heating plate is low, the bridging polymer shrinks, and more current flows, so the heat generation increases; on the contrary, when the temperature is high, the bridging polymer expands, the current flow decreases, and the heat generation decreases; and the temperature sensor is used to detect the temperature in the electric heating rubber guide tube; the temperature controller is used to adjust and control the electric heating plate through the temperature collected by the temperature sensor, and control the power on and off of the electric heating plate according to the temperature information fed back by the temperature sensor;

[0148] Assume that the thermal expansion coefficient of the heating film is , the length of the material is L and the cross-sectional area is A, the temperature changes The change in time is expressed as:

[0149] ,

[0150] in, and are the initial length and cross-sectional area of ​​the heating film respectively;

[0151] The change in resistance is expressed as:

[0152] ,

[0153] Resistivity The change with temperature is expressed by the following formula:

[0154] ,

[0155] in, Expressed as temperature The resistivity under Indicated as reference temperature The resistivity under

[0156] Expressed as the temperature coefficient of the material, Expressed as actual temperature, It is indicated as reference temperature;

[0157] The algorithm used by the temperature controller is PID adjustment. The specific calculation formula is as follows:

[0158] ;

[0159] in, is the proportional gain, is the integral gain, which accumulates past errors and eliminates steady-state errors. is the differential gain, the differential part predicts the change of error and reduces system oscillation, is the current error, calculated by the following formula:

[0160] ,in, is the actual temperature collected, is the reference temperature

[0161] When the temperature is abnormal, the display alarm module will remind the operator to take corresponding measures, and the display alarm module will display the current temperature through a digital display.

[0162] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric heating rubber guide sleeve, characterized in that: The invention comprises a guide barrel body (1), wherein a self-limiting temperature electric heating film (4) is provided in the middle of the guide barrel body (1), an outlet pipe (3) is connected to one side of the guide barrel body (1), connecting rings (2) are fixedly provided on the outer sides of the upper and lower ends of the guide barrel body (1), and a reinforcing strip (7) and a reinforcing ring (6) are fixedly provided on the outer surface of the guide barrel body (1).

2. The electric heating rubber guide sleeve according to claim 1, characterized in that: A fixing seat (5) is fixedly provided on one side of the guide cylinder body (1), the outlet pipe (3) is embedded in the interior of the fixing seat (5), and the outlet pipe (3) is in contact with the outer side of the self-limiting temperature electric heating film (4).

3. The electric heating rubber guide sleeve according to claim 1, characterized in that: The guide tube body (1) comprises an outer layer body (101) and an inner layer body (102); the self-limiting temperature electric heating film (4) is embedded between the outer layer body (101) and the inner layer body (102); and the outer layer body (101) and the inner layer body (102) are integrally formed by vulcanization.

4. The electric heating rubber guide sleeve according to claim 1, characterized in that: The self-limiting temperature electric heating film (4) comprises a pI strip electrode (402), a heating film (403) and a pI film (401); the pI strip electrode (402) is electrically connected to a power line (404); the pI strip electrode (402) is arranged on the upper surface of the pI film (401); the heating film (403) is arranged on the upper surface of the pI strip electrode (402); the pI strip electrode (402), the heating film (403) and the pI film (401) are pressed together.

5. A production process for an electric heating rubber guide sleeve, characterized in that: Used to realize the production and preparation of the above claims 1-4, including the production process of the self-limiting temperature electric heating film (4) and the guide tube body (1): The production steps of the self-limiting temperature electric heating film (4) are as follows: S1. Designing the electrodes of the self-limiting temperature electric heating film (4): confirming the position of the pI band electrode (402) according to the set requirements; S2, copper electrode etching: etching the electrode copper sheet to form a pI band electrode (402); S3. Designing the heating film resistance: calculating the resistance value of the heating film (403) according to the set requirements; S4, pressing and molding: pressing and molding the pI strip electrode (402), the heating film (403) and the pI film (401) to form a self-limiting temperature electric heating film (4); S5, picking out welding holes: picking out welding holes at the electrode pads of the self-limiting temperature electric heating film (4); S6, welding power line (404): welding a suitable power line (404) at the welding hole; S7, insulation treatment: a silicone seal is applied to the welding position of the power line (404) of the self-limiting temperature electric heating film (4), and the welding position of the power line (404) is insulated; S8, electrical performance test: perform electrical performance test on the self-limiting temperature electric heating film (4), and test the leakage, voltage, current, temperature, voltage peak, current peak and power of the self-limiting temperature electric heating film (4); S9, pasting double-sided tape: pasting double-sided tape on both sides of the self-limiting temperature electric heating film (4); S10, fixing the self-limiting temperature electric heating film (4) on the aluminum plate: the aluminum plate is adhered to both sides of the self-limiting temperature electric heating film (4) by double-sided adhesive and fixed by rivets to prepare an electric heating plate.

6. The production process of an electric heating rubber guide sleeve according to claim 5, characterized in that: The heating film (403) in S3 is a conductor made by mixing polyolefin with conductive carbon black and using a film blowing process to form a bridge for the heating element. As the temperature of the heating film (403) changes, the polymer in the bridge expands and contracts, causing the current to change. Therefore, the heat generation will also change with the temperature change. When the temperature of the heating film (403) is low, the bridging polymer shrinks, more current flows, and thus the heat generation increases; on the contrary, when the temperature is high, the bridging polymer itself expands, the current flows less, and the heat generation also decreases.

7. The production process of an electric heating rubber guide sleeve according to claim 5, characterized in that: The production steps of the guide tube body (1) are as follows: A1. Prepare the rubber: Take out the rubber and re-refine it before use; A2. Mold preheating: Take out the mold, clean the inner surface of the mold, and then push the mold into the vulcanizer for preheating; A3. Clean the electric heating plate: wipe the surface of the electric heating plate with 120# gasoline, remove the dust and oil on the surface of the aluminum plate and dry it; A4. Glue the electric heating plate: Evenly apply adhesive on the aluminum plate surface of the electric heating plate and the inner surface of the mold, let it dry and set aside; A5. Cutting rubber: Cut the rubber into sheets of 420mm*160mm and 420mm*180mm. Take 2 sheets of each size and weigh them together with the scraps to 2000±5g for later use. A6. Adhesion of adhesive: First, stick adhesive sheets with a width of 160 mm on the inner surface of the electric heating sheet, and then stick adhesive sheets with a width of 180 mm on the outer surface of the electric heating sheet, and wait for use; A7. Embed the mold: put one of the electric heating sheets with adhesive into the mold cavity of the lower mold, then place the mold core inside the electric heating sheet, and then put another electric heating sheet with adhesive on the upper surface of the mold core, then close the upper mold and the lower mold, and then send the closed mold into the vulcanizer, press it up, and return air 2-3 times; A8. Demolding: After the vulcanization time is reached, the guide tube body (1) is demoulded, and the mold core in the guide tube body (1) is taken out, thereby completing the production of the guide tube body (1).

8. The production process of an electric heating rubber guide sleeve according to claim 5, characterized in that: In the A7, the scraps are placed in the square mold cavity at the wire outlet, and then the wire outlet tube (3) is placed, the center position of the wire outlet tube (3) is kept fixed, and when the upper mold and the lower mold are closed, the wire outlet tube (3) is fixed by the scraps, and finally the power line (404) on the electric heating plate is passed through the wire outlet tube (3) and straightened after passing through.

9. A temperature control system for an electric heating rubber guide tube, characterized in that: Used to implement the temperature control and regulation of claims 5-8 above, comprising an electric heating plate, a temperature sensor, a thermostat, a power module and a display alarm module; The electric heating plate is used to achieve heating, so that when the temperature of the electric heating plate is low, the cross-linking polymer shrinks, more current flows, and thus the heat generation increases; on the contrary, when the temperature is high, the cross-linking polymer itself expands, the current flows less, and the heat generation also decreases; The temperature sensor is used to detect the temperature inside the electric heating rubber guide sleeve; The temperature controller is used to adjust and control the electric heating plate through the temperature collected by the temperature sensor, and control the power on and off of the electric heating plate according to the temperature information fed back by the temperature sensor; The power module is used to provide stable power output to the electric heating plate to ensure the heating requirements of the system; The display alarm module is used to display the current temperature through a digital display and provide a temperature alarm function. When the temperature exceeds the set range, it will remind the operator to take corresponding measures.

10. The temperature control system of the electric heating rubber guide sleeve according to claim 9, characterized in that: The temperature control calculation of the electric heating plate is as follows: Assume that the thermal expansion coefficient of the heating film is , the length of the material is L and the cross-sectional area is A, the temperature changes The change in time is expressed as: ， in, and are the initial length and cross-sectional area of ​​the heating film respectively; The change in resistance is expressed as: ， Resistivity The change with temperature is expressed by the following formula: ， in, Expressed as temperature The resistivity under Indicated as reference temperature The resistivity under Expressed as the temperature coefficient of the material, Expressed as actual temperature, It is indicated as reference temperature; The algorithm used by the temperature controller is PID regulation, and the specific calculation formula is as follows: ； in, is the proportional gain, is the integral gain, which accumulates past errors and eliminates steady-state errors. is the differential gain, the differential part predicts the change of error and reduces system oscillation, is the current error, calculated by the following formula: ,in, is the actual temperature collected, is the reference temperature .

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