CN114986849A - Cable high-frequency preheater and preheating method - Google Patents
Cable high-frequency preheater and preheating method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/79—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling of preformed parts or layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3462—Cables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a cable high-frequency preheater and a preheating method, which are applied to the technical field of wire and cable production, and aim to solve the problems that the measured temperature error is large and the actual temperature of a heated cable cannot be accurately controlled, the technical scheme is as follows: comprises a frame, wherein a feed inlet and a discharge outlet are arranged on the frame; the heating device is arranged in the rack and used for heating the cable to a target temperature; the temperature measuring device is arranged at the discharge hole and used for measuring the actual temperature of the heated cable, and the temperature measuring device is a non-contact temperature sensor based on the heat convection principle; the wire guide device is arranged on the side surface of the rack; the speed measuring device is arranged on one side of the wire device; the control device is arranged on the rack and used for controlling the heating power of the heating device, and the control device is in electric signal connection with the heating device, the temperature measuring device, the speed measuring device and the wire device; the cable temperature measuring device has the technical effects that the actual temperature of the cable can be measured in real time, and the heating power can be automatically adjusted according to the actual temperature.
Description
Technical Field
The invention relates to the technical field of wire and cable production, in particular to a cable high-frequency preheater and a preheating method.
Background
With increasingly rapidly developing information network technology in China, the production requirement on the data cable is higher and higher, and the high-frequency preheater has the advantages of improving the adhesive force of insulation, improving the peeling force between a core wire and a conductor, removing moisture of the core wire, avoiding the generation of bubbles in the insulation, improving the crystallization state of an insulating material, eliminating residual stress and the like, and is more and more widely applied to the production of the data cable. Traditional high frequency pre-heater does not have the value of temperature display or temperature display to be theoretical calculation value, heating effect to reality need adopt outside temperature measuring device to come the auxiliary measurement actual temperature value, and measure the model that needs manual regulation setting value to adjust heating temperature behind the temperature, when producing the model of line speed or cable, when size etc. change, the heating device heating same time of same power, the actual temperature on cable surface risees the numerical value difference great, traditional high frequency pre-heater can't accomplish the heating temperature of real-time temperature measurement and accurate control cable, the heating temperature of cable is unstable, thereby lead to the cladding nature on cable surface poor, easily bulge.
For example, chinese patent No. CN205247982U discloses a copper wire preheater, which comprises a cabinet and a preheating chamber, wherein two electromagnetic heaters are symmetrically arranged on the inner walls of the left and right sides of the preheating chamber, a plurality of small rollers are arranged between the electromagnetic heaters, and a temperature sensor is further arranged inside the preheating chamber; according to the scheme, the temperature sensor is arranged in the preheating chamber, and the temperature of the cable is reflected through the temperature of the preheating chamber; the temperature error of the cable measured by the method is large, and the actual temperature of the heated cable cannot be accurately controlled.
The existing cable preheating method also has the technical problem that accurate temperature control cannot be achieved, so that a cable high-frequency preheater and a preheating method are needed to achieve real-time temperature measurement and accurate temperature control of cable preheating.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cable high-frequency preheater which has the advantages that the actual temperature of a cable can be measured in real time, the heating power can be automatically adjusted according to the actual temperature, and stable heating and accurate temperature control are realized.
In order to achieve the purpose, the invention provides the following technical scheme:
a cable high-frequency preheater comprises
The device comprises a rack, wherein a feed inlet and a discharge outlet are formed in the rack;
the heating device is arranged in the rack and used for heating the cable to a target temperature;
the temperature measuring device is arranged at the discharge hole and used for measuring the actual temperature of the heated cable, and the temperature measuring device is a non-contact temperature sensor based on the heat convection principle;
the wire guiding device is arranged on the side surface of the rack and used for controlling the wiring speed of the cable;
the speed measuring device is arranged on one side of the wire guiding device and used for measuring the wiring speed of the cable;
and the control device is arranged on the rack and used for controlling the heating power of the heating device, and the control device is in electric signal connection with the heating device, the temperature measuring device, the speed measuring device and the wire device.
According to the technical scheme, the cable enters the rack from the feeding hole, enters the heating device for heating after passing through the wire guiding device, and then leaves the rack from the discharging hole; the temperature measuring device is arranged at the discharge port, so that the temperature of the cable can be measured, when the temperature of the cable is inconsistent with the target temperature, the control device can adjust the heating power of the heating device in time, an additional auxiliary temperature measuring process and manual adjustment of the heating power are not needed, the automation degree is high, and real-time temperature measurement and accurate temperature control are realized; because the cable is processed and is walked the line speed very fast man-hour, can reach 200 and give good care to 300m/s, during the temperature measurement of contact temperature sensor, the cable rubs each other after contacting with temperature sensor, because cable surface high temperature and high-speed removal, very easily cause temperature sensor's damage, influence the stability and the accuracy of temperature measurement, and during the non-contact thermoscope of infrared sensing principle, because the size of cable is little, the size of measuring the light spot probably is big than the size of cable, at this moment, stable measurement is unstable, therefore, the temperature measuring device in this scheme adopts the non-contact temperature sensor of thermal convection principle, measure stably, accurately.
Furthermore, the heating device comprises a heating box arranged on the side surface of the rack, a high-frequency generator arranged in the heating box and a double heating coil arranged on the high-frequency generator.
The beneficial effects are that: realize the heating of cable through the electromagnetic heating principle, heating efficiency is high to, this scheme adopts the twin coil heating, can realize the rapid heating to the cable.
Further, the wire device including set up in the frame side along horizontally axis pivoted wire wheel with set up in the frequency modulation motor of wire wheel side, two sets of wire wheel symmetry set up in heating device's upper and lower both sides, the wire wheel of upside, heating device and downside are passed in proper order to the cable, the frequency modulation motor set up in the one end of the pivot of wire wheel, the frequency modulation motor control the wire wheel is rotatory, the speed sensor set up in on the wire wheel.
The beneficial effects are that: the frequency modulation motor is used for controlling the wire speed of the cable, the temperature measuring device is arranged on the wire wheel, the wire speed can be monitored in real time, the control device can control the heating efficiency of the heating device through the change of the wire speed, and the stable heating of the cable is realized.
Furthermore, a control panel for displaying the operation parameters of the equipment is arranged on the control device.
The beneficial effects are that: the control panel can display the temperature to which the current cable is heated in real time, and the operating condition of the device and the heating temperature of the cable can be visually checked by an operator.
Furthermore, the feed inlet and the discharge outlet of the rack are both provided with wire stabilizing guide wheels capable of rotating along horizontal axes, the surfaces of the cables are attached to the circumferential surfaces of the wire stabilizing guide wheels, and the vertical heights of the wire stabilizing guide wheels can be adjusted.
The beneficial effects are that: the arrangement of the wire stabilizing guide wheel is beneficial to the stable routing of the cable, and the cable is prevented from deviating and affecting the processing efficiency and quality; the vertical height of steady line guide pulley can be adjusted, through adjusting the vertical height of steady line guide pulley, can adjust the height of cable for this device can be carried and carry out preheating of cable on different production lines, and the commonality of device is strong.
Furthermore, a horizontal heat-insulating sleeve is arranged at one end, close to the discharge port, of the rack, a heat-insulating layer is arranged on the inner side of the heat-insulating sleeve, the cable horizontally penetrates through the inside of the heat-insulating sleeve, and the temperature measuring device is arranged at one end, far away from the rack, of the heat-insulating sleeve.
The beneficial effects are that: through setting up the heat preservation sleeve, after the cable that is heated leaves the frame through the discharge gate, the heat preservation sleeve can keep warm to the cable that passes its inside, reduces the heat and scatters and disappears, and simultaneously, the heat preservation sleeve can keep apart the cable, avoids cable and environment direct contact after the heating, reduces the environment to the influence of cable, reduces the measuring error of temperature measuring device to the heating temperature that makes the cable is close target temperature more.
Furthermore, the wire guide wheel is provided with a wire inner groove and a wire outer groove, and the cable is wound on the surface of the wire guide wheel through the wire inner groove and is led out from the surface of the wire guide wheel through the wire outer groove.
The beneficial effects are that: due to the arrangement of the inner wire groove and the outer wire groove, the cables cannot interfere with each other in the wiring process, and smooth and stable wiring and stable heating are ensured.
Furthermore, the side of the rack is provided with a remote communication interface.
The beneficial effects are that: the remote communication interface can be used for connecting remote communication equipment to realize remote setting and monitoring of the working state and the heating temperature of the device.
In order to overcome the defects in the prior art, the invention also aims to provide a cable preheating method which has the advantages that the actual temperature of the heated cable is detected in real time, the heating power is automatically adjusted, manual temperature measurement and manual heating temperature adjustment are not needed, the heating temperature is stable, and the error is small.
A cable preheating method utilizes the cable high-frequency preheater and comprises the following steps:
step 1: presetting an initial temperature T of the cable in the control device 1 Target heating temperature T 2 The material of the cable, the radius R of the cable, the radius R of the guide wheel and the speed V of the production line 1 And a starting speed V 2 Starting speed V 2 Less than the production line speed V 1 ；
Step 2: according to the material of the cable preset in the step 1, obtaining the specific heat capacity C and the density rho of the cable, and calculating an adjusting coefficient K and a theoretical value P of heating power 0 Wherein: k ═ C × ρ 2 π 2 R 2 r*V 1 ，P 0 ＝K*(T 2 -T 1 )；
And step 3: the speed measuring device obtains the wiring speed V of the cable 3 And combine V 3 Feeding back the numerical value to the control device;
and 4, step 4: when the line speed V is 3 Not less than starting speed V 2 When the heating device is started, the heating device starts heating, otherwise, the heating device stops heating;
and 5: temperature measuring device acquires actual heating temperature T of cable in real time 3 And will T 3 Feeding back the numerical value to the control device;
step 6: when T is 3 And T 2 When the temperature difference is more than +/-3 ℃, the control device controls the heating power of the heating device to increase or decrease, and the adjustment value delta P of the heating power 1 ＝K*(T 3 -T 2 )；
And 7: speed measuring device for acquiring cable running speed V in real time 3 And will V 3 Feeding the numerical value back to the control device;
and 8: when V is 3 And V 1 When the values of the two are different, the control device controls the heating power of the heating device to increase or decrease, and the adjustment value delta P of the heating power 2 ＝K*(V 3 -V 1 ) When the line speed V is 3 Less than starting speed V 2 At this time, the heating power was reduced to 0.
By the technical scheme, the theoretical value P of the heating power is set 0 After the operator finishes the step 1, the control device can control the heating power according to the theoretical value P of the heating power 0 The initial heating power is adjusted, the heating power does not need to be adjusted manually and slowly, time is wasted, and preheating efficiency is improved; this scheme is passed through speed sensor and temperature measuring device and is carried out real-time correction to the heating power who preheats the in-process, no matter produce speed adjustment of line or actual heatingThe temperature changes, and the heating power of the heating device can be automatically adjusted, so that the heating temperature is stable, and the functions of accurate temperature control and feedback control are realized.
In conclusion, the invention has the following beneficial effects:
this scheme is through setting up speed sensor, temperature measuring device preheats line speed and the actual heating temperature of walking of in-process to the cable and carries out real-time measurement, and adjust heating device's heating power through controlling means, real-time temperature measurement and accurate accuse temperature have been realized, guarantee that heating temperature is stable, and simultaneously, in the heating process, the device can show heating temperature in real time, need not operating personnel and adopt outside temperature measuring device to come the auxiliary measurement actual temperature value, and need not manual regulation heating power, high efficiency, heating temperature is accurate, the error is little.
Drawings
FIG. 1 is a schematic overall structure of the present invention;
FIG. 2 is a rear side view of FIG. 1;
FIG. 3 is a schematic structural diagram of the hidden rack of the present invention;
fig. 4 is a schematic view of the structure of the heating apparatus of the present invention.
In the figure: 1. a frame; 2. a wire guide device; 21. a wire guide wheel; 211. an upper wire guide wheel; 212. a lower wire guide wheel; 22. a frequency modulation motor; 3. a speed measuring device; 4. a heating device; 41. a heating box; 42. a high frequency generator; 43. a heating coil; 5. a temperature measuring device; 6. a control device; 7. a remote communication interface; 8. a wire stabilizing guide wheel; 9. a cable; 10. a guide wheel mounting plate; 11. a manual linear sliding table; 111. adjusting a hand wheel; 112. a slide base; 113. an optical axis; 114. a ball screw; 115. a slider; 12. a heat-insulating sleeve; 14. an adjustment groove; 15. adjusting a rod; 16. a stopper; 17. an inner wire groove; 18. and a wire outer groove.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1:
as shown in fig. 1-4, a cable high-frequency preheater for preheating a cable 9 includes a frame 1, and a conductor device 2, a speed measuring device 3, a heating device 4, a temperature measuring device 5 and a control device 6 which are arranged on the frame 1, wherein the control device 6 is in electrical signal connection with the heating device 4, the temperature measuring device 5, the speed measuring device 3 and the conductor device 2.
As shown in fig. 1 and 2, the rack 1 is a cuboid structure, a feed port and a discharge port are arranged on the rack 1, the feed port and the discharge port are arranged on two opposite side surfaces of the rack 1, and the cable 9 enters the rack 1 from the feed port and leaves the rack 1 after being led out from the discharge port; one side of the rack 1 is provided with a remote communication interface 7, and the remote communication interface 7 is connected with communication equipment so as to realize remote control and check the working state of the device.
As shown in fig. 1, a feeding port and a discharging port of a frame 1 are both provided with a wire stabilizing guide wheel 8, the wire stabilizing guide wheel 8 can rotate along a horizontal axis, the surface of a cable 9 is attached to the circumferential surface of the wire stabilizing guide wheel 8, and the vertical height of the wire stabilizing guide wheel 8 can be adjusted; a guide wheel mounting plate 10 is arranged on one side, close to a feeding hole, of the rack 1, a vertical manual linear sliding table 11 is connected onto the guide wheel mounting plate 10, the manual linear sliding table 11 comprises an adjusting hand wheel 111, a sliding seat 112, an optical axis 113, a ball screw 114 and a sliding block 115, the adjusting hand wheel 111 is arranged above the guide wheel mounting plate 10, the sliding seat 112 is vertically arranged on the guide wheel mounting plate 10, the sliding seat 112 is of a U-shaped structure, the sliding seat 112 of the U-shaped structure comprises a vertically arranged vertical plate and a horizontal plate perpendicular to the vertical plate, and the two groups of horizontal plates are symmetrically arranged at two ends of the vertical plate along the length direction of the vertical plate; two ends of the optical axis 113 in the vertical direction are respectively abutted against two opposite side surfaces of the horizontal plate of the sliding seat 112, and the two groups of optical axes 113 are symmetrically arranged along the vertical axis of the sliding seat 112; the ball screw 114 is vertically arranged in the middle between the two groups of optical axes 113, and two ends of the ball screw 114 in the vertical direction are respectively abutted against a horizontal plate at the lower end of the sliding seat 112 and the lower end of the adjusting hand wheel 111; the sliding block 115 is arranged on the optical axis 113 and the ball screw 114 in a sliding manner, and the wire-stabilizing guide wheel 8 is arranged on the sliding block 115 in a rotating manner; when the position of the wire stabilizing guide wheel 8 needs to be adjusted, the adjusting hand wheel 111 is rotated to enable the ball screw 114 to rotate, so that the sliding block 115 is driven to move, and the wire stabilizing guide wheel 8 moves synchronously with the sliding block 115; in this embodiment, the wire stabilizing guide wheels 8 of the feeding port are arranged in two sets, the two sets of wire stabilizing guide wheels 8 are arranged in a vertically staggered manner, and a gap through which the cable 9 can horizontally pass is formed between the lower end of the wire stabilizing guide wheel 8 located above and the upper end of the wire stabilizing guide wheel 8 located below.
As shown in fig. 1 and 4, a horizontal heat-insulating sleeve 12 is disposed at one end of the frame 1 close to the discharge port, a heat-insulating layer is disposed at an inner side of the heat-insulating sleeve 12, the heat-insulating layer may be rock wool, polyurethane foam or aluminum carbonate needle felt, etc., the cable 9 horizontally passes through the inside of the heat-insulating sleeve 12, the wire-stabilizing guide wheel 8 at the feed port is disposed inside the heat-insulating sleeve 12, a vertical adjusting groove 14 is disposed at a side surface of the heat-insulating sleeve 12, a horizontal adjusting rod 15 is disposed in the adjusting groove 14, the adjusting rod 15 is connected to the heat-insulating sleeve 12 through a bolt, one end of the adjusting rod 15 far away from the heat-insulating sleeve 12 is disposed outside the heat-insulating sleeve 12, one end of the adjusting rod 15 close to the heat-insulating sleeve 12 is connected to the side surface of the wire-stabilizing guide wheel 8, the adjusting rod 15 and the wire-stabilizing guide wheel 8 are coaxially disposed, a stopper 16 is disposed on the adjusting rod 15, one side of the stopper 16 far away from the wire-stabilizing guide wheel 8 is attached to an inner wall of the heat-insulating sleeve 12, the size of the stopper 16 is larger than that of the adjusting groove 14, when the sliding adjusting rod 15 is positioned in the adjusting groove 14, the stopper 16 and the wire stabilizing guide wheel 8 can synchronously move, and at the moment, the height of the wire stabilizing guide wheel 8 is adjusted; because the size of the stop 16 is larger than that of the adjusting groove 14, the stop 16 can always stop the adjusting groove 14, so that the inside of the heat-insulating sleeve 12 is isolated from the external environment;
the temperature measuring device 5 is arranged at the discharge port and is positioned at one end, far away from the rack 1, of the heat insulation sleeve 12, the temperature measuring device 5 is used for measuring the actual temperature of the heated cable 9, the temperature measuring device 5 is a non-contact temperature sensor based on the heat convection principle, and the temperature measuring device 5 in the embodiment can be a non-contact online temperature measuring instrument produced by Germany LUNE.
As shown in fig. 1, the control device 6 is disposed at a side of the rack 1 for controlling the heating power of the heating device 4, and the control device 6 is provided with a control panel for displaying the operation parameters of the apparatus, and the control panel displays the setting parameters and the operating state of the apparatus.
As shown in fig. 1 and 3, the wire guiding device 2 is arranged on the side surface of the rack 1 and used for controlling the routing speed of the cable 9, the wire guiding device 2 includes a wire guiding wheel 21 arranged on the side surface of the rack 1 and a frequency modulation motor 22 arranged on the side surface of the wire guiding wheel 21, the wire guiding wheel 21 can rotate along a horizontal axis, a rotating shaft is arranged in the middle of the wire guiding wheel 21 and connected with the output end of the frequency modulation motor 22, and the frequency modulation motor 22 controls the wire guiding wheel 21 to rotate; the wire guiding wheels 21 in this embodiment are provided with two sets of upper wire guiding wheels 211 and lower wire guiding wheels 212, the upper wire guiding wheels 211 and the lower wire guiding wheels 212 are symmetrically arranged on the upper side and the lower side of the heating device 4, the cable 9 sequentially passes through the upper wire guiding wheels 211, the heating device 4 and the lower wire guiding wheels 212, the upper wire guiding wheels 211 are provided with inner wire guiding grooves 17 and outer wire guiding grooves 18, the cable 9 firstly enters the inner wire guiding grooves 17 of the upper wire guiding wheels 211 after entering the feeding hole, then enters one heating coil 43 for heating, then winds on the lower wire guiding wheels 212 and is heated by the other heating coil 43, is led out from the outer wire guiding grooves 18 of the upper wire guiding wheels 211 and then leaves the machine frame 1 through the discharging hole.
As shown in fig. 3, the speed measuring device 3 is disposed on one side of the wire guide wheel 21 close to the fm motor 22, the speed measuring device 3 is used for measuring the running speed of the cable 9, and the speed measuring device 3 in this embodiment may adopt an optical tachometer or a gear tachometer of the prior art.
As shown in fig. 4, the heating device 4 is provided in the rack 1 for heating the cable 9 to a target temperature, the heating device 4 includes a heating box 41 provided in a side of the rack 1, a high-frequency generator 42 provided in the heating box 41, and a heating coil 43 provided in the high-frequency generator 42, and two sets of the high-frequency generator 42 and the heating coil 43 are used in this embodiment, which can effectively improve the heating efficiency.
When the heating device works, firstly, a target heating temperature is preset in the cable 9, then, the cable 9 enters the rack 1 from the feeding hole and is guided by the wire device 2 to enter the heating device 4, the heated cable 9 leaves the rack 1 from the discharging hole, and when the cable 9 passes through the temperature measuring device 5, the temperature measuring device 5 measures the actual temperature of the heated cable 9 and displays the measured temperature on the control panel in real time; when the heated actual temperature is lower than the target heating temperature, the control device 6 controls the heating power of the heating device 4 to be increased, so that the real-time measurement and the accurate control of the heating temperature of the cable 9 are realized.
Example 2:
as shown in fig. 1 and 2, a cable preheating method using the cable high-frequency preheater comprises the following steps:
step 1: the initial temperature T of the cable 9 is preset in the control device 6 1 Target heating temperature T 2 The material of the cable, the radius R of the cable, the radius R of the guide wheel and the speed V of the production line 1 And a starting speed V 2 Starting speed V 2 Less than the production line speed V 1 。
In the present scheme, in actual application, control software is embedded in the control device 6 in advance, and the production line speed V is usually 1 The speed V of the production line is determined according to the conditions of production yield, delivery construction period and the like 1 The change is not frequent after the determination; the dimension of the cable 9 to be processed can influence the radius R of the cable 9, and the radius R needs to be determined in advance before processing; the material of the cable 9 is typically a metal material, such as: copper, aluminum, tin, and the like.
Step 2: according to the material of the cable 9 preset in the step 1, obtaining the specific heat capacity C and the density rho of the cable 9, and calculating an adjusting coefficient K and a theoretical value P of heating power 0 Wherein: k ═ C ═ ρ · 2 π 2 R 2 r*V 1 ，P 0 ＝K*(T 2 -T 1 )。
The material of the input cable 9 is input into the control device 6, and the control software in the control device 6 can automatically call the specific heat capacity and density of the cable 9 from the database of the system, for example, when the material is copper, the specific heat capacity is 0.39 × 10 3 J/(kg. DEG C.), density of 8.92g/cm 3 Subsequently, the control device 6 automatically calculates the heating power theoretical value and the adjustment coefficient.
And step 3: the speed measuring device 3 obtains the running speed V of the cable 9 3 And will V 3 The numerical value is fed back to the control device 6.
And 4, step 4: when the line speed V is 3 Not less than starting speed V 2 When the heating device 4 is started, the heating device 4 stops heating.
And 5: the temperature measuring device 5 obtains the actual heating temperature T of the cable 9 in real time 3 And will T 3 The numerical value is fed back to the control device 6.
Step 6: when T is 3 And T 2 When the temperature difference is more than +/-3 ℃, the control device 6 controls the heating power of the heating device 4 to increase or decrease, and the adjustment value delta P of the heating power 1 ＝K*(T 3 -T 2 )。
The scheme sets the temperature adjusting error to +/-3 ℃, belongs to an index with higher precision requirement in the cable 9 preheating industry, and can ensure that the subsequently processed cable 9 cannot bulge and has good quality stability.
And 7: the speed measuring device 3 obtains the running speed V of the cable 9 in real time 3 And will V 3 The numerical value is fed back to the control device 6.
And 8: when V is 3 And V 1 When the values of (A) and (B) are different, the control device 6 controls the heating power of the heating device 4 to increase or decrease, and the adjustment value of the heating power is Delta P 2 ＝K*(V 3 -V 1 ) When the line speed V is 3 Less than starting speed V 2 At this time, the heating power was reduced to 0.
Due to the production line speed V 1 And a running speed V 3 Usually, the cable is not easily affected by the environment, so a large adjustment error is not set, meanwhile, the cable running speed of the cable 9 is usually fast and can reach 200 and 300m/s, when the cable running speed changes, the influence on the heating temperature of the cable 9 is large, therefore, the heating power needs to be adjusted in time, in the scheme, V is used for adjusting the heating power 3 And V 1 The numerical values are compared in real time, and when errors occur, adjustment can be made in time; when the line speed V is 3 Less than starting speed V 2 In the process, the control device 6 controls the heating power of the heating device 4 to be reduced to 0, so that the cable 9 is prevented from being heated for a long time and being blown.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A cable high-frequency preheater is characterized by comprising
The device comprises a rack (1), wherein a feeding hole and a discharging hole are formed in the rack (1);
a heating device (4) arranged in the rack (1) and used for heating the cable (9) to a target temperature;
the temperature measuring device (5) is arranged at the discharge hole and used for measuring the actual temperature of the heated cable (9), and the temperature measuring device (5) is a non-contact temperature sensor based on the heat convection principle;
the wire guiding device (2) is arranged on the side surface of the rack (1) and is used for controlling the wiring speed of the cable (9);
the speed measuring device (3) is arranged on one side of the wire guiding device (2) and is used for measuring the wiring speed of the cable (9);
the control device (6) is arranged on the rack (1) and used for controlling the heating power of the heating device (4), and the control device (6) is in electric signal connection with the heating device (4), the temperature measuring device (5), the speed measuring device (3) and the wire device (2).
2. Cable high-frequency preheater according to claim 1, characterized in that the heating device (4) comprises a heating box (41) arranged at the side of the machine frame (1), a high-frequency generator (42) arranged in the heating box (41) and heating coils (43) arranged in the high-frequency generator (42), the heating coils (43) being arranged in two groups.
3. A cable high-frequency preheater according to claim 2, wherein the wire guiding device (2) comprises a wire guiding wheel (21) arranged on a side surface of the rack (1) and rotating along a horizontal axis and a frequency modulation motor (22) arranged on a side surface of the wire guiding wheel (21), two sets of the wire guiding wheels (21) are symmetrically arranged on upper and lower sides of the heating device (4), a cable (9) sequentially passes through the wire guiding wheel (21) on the upper side, the heating device (4) and the wire guiding wheel (21) on the lower side, the frequency modulation motor (22) is arranged at one end of a rotating shaft of the wire guiding wheel (21), the frequency modulation motor (22) controls the rotation of the wire guiding wheel (21), and the speed measuring device (3) is arranged on the wire guiding wheel (21).
4. Cable high frequency preheater according to claim 3, characterized in that a control panel for displaying device operating parameters is provided on the control means (6).
5. The cable high-frequency preheater according to claim 4, wherein the feed inlet and the discharge outlet of the rack (1) are respectively provided with a wire stabilizing guide wheel (8) capable of rotating along a horizontal axis, the surface of the cable (9) is attached to the circumferential surface of the wire stabilizing guide wheel (8), and the vertical height of the wire stabilizing guide wheel (8) is adjustable.
6. The cable high-frequency preheater according to claim 5, wherein a horizontal heat-insulating sleeve (12) is arranged at one end of the rack (1) close to the discharge port, a heat-insulating layer is arranged at the inner side of the heat-insulating sleeve (12), the cable (9) horizontally penetrates through the inside of the heat-insulating sleeve (12), and the temperature measuring device (5) is arranged at one end of the heat-insulating sleeve (12) far away from the rack (1).
7. A cable high-frequency preheater according to claim 6, wherein the wire guide wheel (21) is provided with an inner wire guide groove (17) and an outer wire guide groove (18), the cable (9) is wound on the surface of the wire guide wheel (21) through the inner wire guide groove (17), and is led out from the surface of the wire guide wheel (21) through the outer wire guide groove (18).
8. Cable high frequency preheater according to claim 7, characterized in that the side of the rack (1) is provided with a telecommunication interface (7).
9. A cable preheating method, characterized by using the cable high-frequency preheater as claimed in any one of claims 1 to 8, and comprising the steps of:
step 1: the initial temperature T of the cable (9) is preset in the control device (6) 1 Target heating temperature T 2 The material of the cable (9), the radius R of the cable (9), the radius R of the wire guiding wheel and the production line speed V 1 And a starting speed V 2 Starting speed V 2 Less than the production line speed V 1 ；
Step 2: according to the material of the cable (9) preset in the step 1, the specific heat capacity C and the density rho of the cable (9) are obtained, and an adjusting coefficient K and a theoretical value P of heating power are calculated 0 Wherein: k ═ C ═ ρ · 2 π 2 R 2 r*V 1 ，P 0 ＝K*(T 2 -T 1 )；
And step 3: the speed measuring device (3) acquires the running speed V of the cable (9) 3 And will V 3 The numerical value is fed back to the control device (6);
and 4, step 4: when the line speed V is 3 Not less than starting speed V 2 When the heating device (4) is started, otherwise, the heating device (4) stops heating;
and 5: the temperature measuring device (5) acquires the actual heating temperature T of the cable (9) in real time 3 And will T 3 The numerical value is fed back to the control device (6);
step 6: when T is 3 And T 2 When the temperature difference is more than +/-3 ℃, the control device (6) controls the heating power of the heating device (4) to increase or decrease, and the adjustment value delta P of the heating power 1 ＝K*(T 3 -T 2 )；
And 7: the speed measuring device (3) acquires the wiring speed V of the cable (9) in real time 3 And will V 3 The numerical value is fed back to the control device (6);
and 8: when V is 3 And V 1 When the values of (A) and (B) are different, the control device (6) controls the heating power of the heating device (4) to increase or decrease, and the adjustment value of the heating power is delta P 2 ＝K*(V 3 -V 1 ) When the line speed V is 3 Less than starting speed V 2 While the heating power is reduced to 0。
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| CN202210627209.5A CN114986849A (en) | 2022-06-02 | 2022-06-02 | Cable high-frequency preheater and preheating method |
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