A mining optical cable and its preparation process

Abstract

The invention relates to the technical field of optical cables, and specifically discloses a mining optical cable and a preparation process thereof, comprising the following steps: subjecting a conductor blank to ingot drawing to obtain a blank wire body to obtain a conductor core; uniformly injecting an insulating material onto the outside of the conductor core to obtain a basic core; extruding and coating an outer sheath material onto the outside of the basic core, arranging N groups of light curtain sensors at equal intervals on the outside of an optical cable extruded by an extruder, and calculating and obtaining a diameter deviation value; and comparing the values ​​with a diameter steady-state value; obtaining an extrusion diameter abnormality signal; obtaining instantaneous extrusion information of each light curtain irradiation point under the extrusion state of the extruder; calculating and obtaining a stable rate of an extrusion rate stable line and obtaining an aging abnormality signal; and monitoring and adjusting the barrel temperature in the extruder based on the aging abnormality signal, thereby ensuring the extrusion rate of the optical cable during the extrusion process, and solving the problem of abnormal extrusion diameter of the optical cable, so that the production efficiency of the optical cable during the extrusion process will not be greatly affected.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cables, and in particular to an optical cable for mining and a preparation process thereof. Background Art

[0002] When installing mining optical cables, due to the complex terrain in the mining area, there are many stones and coal blocks on the ground, and the edges and corners are sharp. Therefore, mining optical cables are required to have good wear resistance to prevent them from being scratched during pulling and installation. During the processing of optical cables, protective materials need to be extruded through extrusion equipment to wrap the optical fiber and strengthen the protection of the optical cable;

[0003] However, during the extrusion process, the outer sheath covers the outside of the basic core of the cable to protect the core. During extrusion, the existing extruder may have uneven cable diameters due to the influence of the temperature and extrusion rate of the outer sheath slurry, resulting in unstable quality of the optical cable. During adjustment, manual shutdown is required for continuous testing, and the extrusion process cannot monitor and adjust the diameter changes of the optical cable, and timely warnings cannot be issued when abnormalities occur, affecting the extrusion efficiency and stability of the optical cable. Summary of the invention

[0004] The object of the present invention is to provide a mining optical cable and a preparation process thereof to solve the above-mentioned background problems.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A preparation process of a mining optical cable comprises the following steps:

[0007] Step 1: Conductor production: The conductor blank is cast and drawn to obtain a blank wire body; the drawn conductor is heat treated to obtain a conductor wire core;

[0008] Step 2: Injection molding and braiding: Inject the insulating material evenly onto the outside of the conductor core to form an insulating layer; then use the insulating material to braid the braided layer outside the insulating layer to obtain an outer sheath, thereby obtaining a basic core;

[0009] Step 3: Outer layer extrusion: Place the outer sheath slurry and the basic wire core in an extruder, extrude and coat the outer sheath material on the outside of the basic wire core to obtain the optical cable body;

[0010] include:

[0011] N groups of light curtain sensors are set at equal intervals on the outside of the optical cable extruded by the extruder to measure the diameter of the optical cable and mark it as D N ; N is 1, 2, 3…;

[0012] Calculate the diameter deviation value D J ; and the diameter steady state value D YCompare and obtain abnormal signal of extrusion diameter;

[0013] Obtain the instantaneous extrusion information of each light curtain irradiation point under the extrusion state of the extruder; calculate the stability rate f of the extrusion rate stability line and obtain the abnormal aging signal;

[0014] Based on the abnormal aging signal, the barrel temperature in the extruder is monitored and adjusted.

[0015] As a further solution of the present invention: the central axes of the N groups of light curtain sensors intersect and are perpendicular to the central axis of the optical cable body, and the central axes of two adjacent groups of light curtain sensors are kept .

[0016] As a further solution of the present invention: the diameter deviation value D J ; is calculated as:

[0017] Get the nominal value range of the optical cable diameter [Bin, Bax];

[0018] Determine the diameter measurement value D N The number of diameter measurements within the nominal diameter range [Bin, Bax], marked as m;

[0019] For N groups of diameter measurements D at time t N Calculate the standard deviation of the cable diameter at time t and mark it as BC t ;

[0020] Get the diameter measurement D N The maximum diameter D MAX and minimum diameter measurement D MIN ;pass Calculate the diameter deviation value D J .

[0021] As a further solution of the present invention: the diameter deviation value D J and diameter steady state value D Y Make comparisons;

[0022] If the diameter deviation value D J Greater than or equal to the diameter steady state value D Y ; Generate extrusion diameter stable signal;

[0023] If the diameter deviation value D J Smaller than the diameter steady state value D Y ; Generate extrusion diameter abnormal signal.

[0024] As a further solution of the present invention: the instantaneous extrusion information includes: instantaneous extrusion rate value SV N And instantaneous extrusion temperature value STN ;

[0025] Based on the instantaneous extrusion rate value SV N , with the light curtain sensor far away from the extruder as the horizontal coordinate, and the instantaneous extrusion rate value SV N As the ordinate, we get the coordinate set (N, SV N );

[0026] The coordinate set (N, SV N ) is input into the extrusion rate coordinate system and the extrusion rate steady line is obtained; and the steady rate f of the extrusion rate steady line is calculated;

[0027] If the stable rate f of the extrusion rate is 0, a time-stability signal is generated; if the stable rate f of the extrusion rate is not 0, a time-stability abnormality signal is generated.

[0028] As a further solution of the present invention: based on the abnormal aging signal, the extrusion screw speed value is obtained and marked as JLV; at the same time, the barrel temperature value of each light curtain irradiation point in the extruder extrusion state is obtained and marked as JT N ;

[0029] Based on the variable speed model Calculate and obtain the barrel temperature adjustment value JT B ; In the speed-changing model, SV is the extrusion rate value, JLV is the screw speed value, JT is the barrel temperature value, JZ is the die resistance value, η is the power speed factor, and γ is the barrel temperature speed-changing influence factor;

[0030] Among them, the calculation method of the nose resistance value JZ is: Among them, a is the positive factor of head resistance, b is the negative factor of head resistance, and c is the correction value of head resistance;

[0031] The barrel temperature value JT N and barrel temperature adjustment value JT B Make comparisons;

[0032] If the barrel temperature value JT N Equal to the barrel temperature adjustment value JT B , monitor and adjust the extrusion temperature under extrusion state;

[0033] If the barrel temperature value JT N Not equal to barrel temperature adjustment value JT B , a modulated signal is generated.

[0034] As a further solution of the present invention: the step of monitoring and adjusting the extrusion temperature in the extrusion state comprises:

[0035] Based on the instantaneous extrusion temperature value ST under the instantaneous extrusion stateN ; Get instantaneous extrusion temperature reference value STZ;

[0036] The instantaneous extrusion temperature value ST N The instantaneous temperature deviation value STP is obtained by performing a difference calculation with the instantaneous extrusion temperature reference value STZ. N ; At the same time, obtain the instantaneous temperature deviation threshold STPY and compare it with the instantaneous temperature deviation value STP N Make comparisons;

[0037] Get instantaneous temperature deviation value STP N The values ​​that are less than the temperature deviation threshold STPY are marked as i; at the same time, the maximum instantaneous temperature deviation STPax is obtained;

[0038] By STYb= Calculate and obtain the instantaneous temperature variation value STYb;

[0039] Compare the instantaneous temperature variation value STYb with the temperature variation threshold value STYY;

[0040] If the instantaneous temperature variation value STYb is less than or equal to the temperature variation threshold value STYY, a temperature stability signal is generated;

[0041] If the instantaneous temperature change value is greater than the temperature change threshold STYY, a temperature abnormality signal is generated.

[0042] As a further solution of the present invention: based on the temperature stabilization signal, the barrel temperature value JT of the corresponding light curtain irradiation point at the extruder extrusion time is obtained N , and obtain the die head temperature value and die opening temperature value at that moment, and mark them as JH respectively N and JM N ;

[0043] pass Calculate and obtain the head temperature value JH N And barrel temperature value JT N The previous temperature difference between and is marked as TCq;

[0044] pass Calculate the die temperature value JM N And the head temperature value JH N The rear temperature difference between the two is marked as TCh;

[0045] The ratio between the temperature difference value TCh and the temperature difference value TCq is calculated to obtain the warm state temperature difference ratio TCB; that is, ;

[0046] Determine whether the warm state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY];

[0047] If the warm state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY], a temperature difference stability signal is generated;

[0048] If the warm state temperature difference ratio TCB is not within the temperature difference ratio range [CBX, CBY], a temperature difference abnormality signal is generated.

[0049] As a further solution of the present invention: based on the temperature abnormality signal, an instantaneous extrusion temperature reference value STZ and a preset die pressure value JMP during the extrusion process are obtained;

[0050] pass The instantaneous extrusion temperature response value STX is calculated; wherein, d is the die pressure influence factor, and e is the die temperature coefficient ratio;

[0051] If the instantaneous extrusion temperature value ST N Equal to the instantaneous extrusion temperature response value STX, generating a normal die signal;

[0052] If the instantaneous extrusion temperature value ST N It is not equal to the instantaneous extrusion temperature response value STX, and a die opening abnormality signal is generated.

[0053] As a further solution of the present invention: a mining optical cable is prepared by the above-mentioned preparation process; it comprises: symmetrically arranged conductor cores, two conductor cores are provided with insulating layers on the outside, a braided layer is provided on the outside of the insulating layer, and an outer sheath is provided on the outside of the braided layer.

[0054] Beneficial effects of the present invention:

[0055] In the present invention, by monitoring the diameter of the optical cable extruded, when the diameter of the optical cable is abnormal, the operating state of the extruder is monitored and adjusted based on the extrusion rate and the extrusion temperature, so as to solve the problem of abnormal diameter of the optical cable during the extrusion process; and in the process of factor analysis and adjustment of the extrusion rate of the optical cable, the extrusion rate of the optical cable during the extrusion process is guaranteed, so that the production efficiency of the optical cable during the extrusion process will not be greatly affected, and the production rate is guaranteed to be unaffected while solving the problem of abnormal extrusion diameter of the optical cable;

[0056] In addition, when analyzing the extrusion temperature of the extruder, when a large temperature change occurs in the temperature difference between the barrel temperature, the head temperature and the die temperature, it will have a greater impact on the extrusion process of the entire optical cable. Therefore, in the monitoring and regulation of the extrusion temperature, it is necessary to ensure that the temperature difference ratio of the extruder is within the temperature difference ratio range to achieve a better adjustment state, that is, to solve the impact of the extrusion temperature on the optical cable diameter and ensure the qualified rate of the optical cable diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] Figure 1 It is a schematic diagram of the process structure of the preparation process of the present invention;

[0059] Figure 2 It is a schematic diagram of the preparation process of the present invention;

[0060] Figure 3 is a cross-sectional view of the mining optical cable of the present invention;

[0061] In the figure: 1. Conductor core; 2. Outer sheath; 3. Braided layer; 4. Insulation layer. DETAILED DESCRIPTION

[0062] 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. Embodiment 1

[0063] See also Figure 2 As shown, the present invention is a preparation process of a mining optical cable, comprising the following steps:

[0064] Step 1: Conductor production: The conductor blank is cast and drawn to obtain a blank wire body; the drawn conductor is heat treated to obtain a conductor core 1;

[0065] In the process of selecting the conductor core 1, high-purity copper or aluminum can be selected as the conductor material to ensure good conductivity, and the conductor cross-sectional area and quantity are determined according to the cable specifications and design requirements;

[0066] Step 2: injection molding and braiding: the insulating material is uniformly injected onto the outside of the conductor core 1 to form an insulating layer 4; then, the braided layer 3 is braided with the insulating material outside the insulating layer 4 to obtain a basic core;

[0067] The outer layer material can be selected from insulating materials with excellent insulation performance and resistance to mining environment, such as XLPE (cross-linked polyethylene). The quality of the insulating material must be stable and meet relevant standards;

[0068] The outer sheath material can be made of special materials that are wear-resistant, oil-resistant, and corrosion-resistant, such as polyvinyl chloride (PVC) or polychloroprene rubber (CR);

[0069] Step 3: Extrusion of outer layer: placing the outer sheath slurry and the basic wire core in an extruder, extruding and coating the outer sheath material on the outside of the basic wire core to obtain the outer sheath 2, and then obtaining the optical cable body;

[0070] During the extrusion process of the optical cable, the change of its extrusion state is directly affected by the extrusion rate and extrusion temperature. Extrusion temperature that is too high may cause slight deformation after extrusion, while extrusion temperature that is too low may cause unevenness on the surface of the optical cable. Extrusion rate that is too fast may also cause extrusion deformation, while extrusion rate that is too slow may also cause abnormalities on the surface of the cable.

[0071] Therefore, when the extrusion diameter shows abnormal diameter signals, it is necessary to determine the extrusion rate and extrusion temperature; Mining optical cable is a kind of optical cable product specially used in coal mine communication, monitoring and other fields. Mining optical cable is widely used in coal mine underground communication, monitoring, safety and other fields, and is an important part of coal mine communication system;

[0072] The demand for mining optical cables is growing. As the interconnection transmission line between mine equipment, mining optical cables can interconnect the equipment, so that the equipment can realize real-time monitoring of underground temperature, harmful gases, underground vibration and underground pressure, remote control of mining screen and other functions, thereby achieving the goal of "safe, less manpower and efficient" coal mine production. Therefore, in the production process of mining optical cables, it is necessary to ensure the qualified rate of mining optical cables to ensure safety and stability during use. Embodiment 2

[0073] like Figure 1 As shown, the present invention is a preparation process of a mining optical cable, comprising:

[0074] S01: N groups of light curtain sensors are arranged at equal intervals on the outside of the optical cable extruded by the extruder, and the light curtain sensors are numbered N in sequence from the point farthest from the extruder, where N is 1, 2, 3, etc.;

[0075] Get the optical cable diameter measured by each group of light curtain sensors at the same time t, that is, the diameter measurement value, and mark it as D N ;

[0076] S02: Get the nominal value range of the optical cable diameter [Bin, Bax];

[0077] Determine the diameter measurement value D N The number of diameter measurements within the nominal diameter range [Bin, Bax], marked as m;

[0078] For N groups of diameter measurements D at time t N Calculate the standard deviation of the cable diameter at time t and mark it as BC t ;

[0079] S03: Get the diameter measurement value D N The maximum diameter D MAX and minimum diameter measurement DMIN ;pass Calculate the diameter deviation value D J ;

[0080] The diameter deviation value D J and diameter steady state value D Y Make comparisons;

[0081] If the diameter deviation value D J Greater than or equal to the diameter steady state value D Y ; Generate extrusion diameter stable signal;

[0082] If the diameter deviation value D J Smaller than the diameter steady state value D Y ; Generate extrusion diameter abnormal signal;

[0083] During the extrusion process of the optical cable, the change of its extrusion state is directly affected by the extrusion rate and extrusion temperature. Extrusion temperature that is too high may cause slight deformation after extrusion, while extrusion temperature that is too low may cause unevenness on the surface of the optical cable. Extrusion rate that is too fast may also cause extrusion deformation, while extrusion rate that is too slow may also cause abnormalities on the surface of the cable.

[0084] Therefore, when the extrusion diameter shows abnormal diameter signals, it is necessary to determine the extrusion rate and extrusion temperature;

[0085] Among them, the extrusion rate is to ensure the production efficiency of the optical cable, and the extrusion rate is affected by the extrusion screw speed and barrel temperature. Therefore, when the optical cable diameter is abnormally extruded, the extrusion state in the extruder is monitored and regulated; if it is caused by problems with the barrel and extrusion screw in the extruder, it is directly regulated to ensure the state of the outer sheath slurry in the extruder and the speed of the extrusion screw, further ensuring that the extrusion rate can meet the production efficiency of the optical cable;

[0086] S04: Based on the extrusion diameter abnormal signal; obtaining the instantaneous extrusion information of each light curtain irradiation point under the extrusion state of the extruder;

[0087] Among them, the instantaneous extrusion information includes: instantaneous extrusion rate value SV N And instantaneous extrusion temperature value ST N ;

[0088] Based on the instantaneous extrusion rate value SV N , with the light curtain sensor far away from the extruder as the horizontal coordinate, and the instantaneous extrusion rate value SV N As the ordinate, we get the coordinate set (N, SV N );

[0089] The coordinate set (N, SV N) is input into the extrusion rate coordinate system and the extrusion rate steady line is obtained; and the steady rate f of the extrusion rate steady line is calculated; it should be noted that the horizontal axis of the extrusion rate coordinate system is the light curtain sensor number N, and the vertical axis is the extrusion rate value SV N ; The extrusion rate plateau line refers to the coordinate set (N, SV N ) is the optimal line for the change of, which is a straight line; the stability rate f is the rate of change of the extrusion rate;

[0090] S05: Determine whether the stability rate f of the extrusion rate value is 0 during the extrusion process;

[0091] If the stable rate f of the extrusion rate is 0, a time-stabilization signal is generated; then S07 is executed;

[0092] If the stable rate f of the extrusion rate is not 0, an abnormal aging signal is generated; then S06 is executed;

[0093] It should be noted that the change of extrusion rate will cause the diameter of the optical cable after extrusion to be abnormal. Therefore, when the stability rate f of the extrusion rate is 0, it means that the change of the extrusion rate is in a stable state, which means that there is no problem with the extrusion rate during the extrusion process.

[0094] If the extrusion rate stability rate f is not 0, the extrusion rate fluctuates, indicating that the screw speed in the extruder or the temperature in the barrel is not enough to heat the outer sheath slurry during the extrusion process, resulting in abnormal extrusion rate;

[0095] S06: Based on the abnormal aging signal, obtain the extrusion screw speed value and mark it as JLV; at the same time, obtain the barrel temperature value of each light curtain irradiation point in the extruder extrusion state and mark it as JT N ;

[0096] Based on the variable speed model Calculate and obtain the barrel temperature adjustment value JT B ; In the speed-changing model, SV is the extrusion rate value, JLV is the screw speed value, JT is the barrel temperature value, JZ is the die resistance value, η is the power speed factor, and γ is the barrel temperature speed-changing influence factor;

[0097] Among them, the calculation method of the nose resistance value JZ is: Among them, a is the positive factor of head resistance, b is the negative factor of head resistance, and c is the correction value of head resistance;

[0098] Since the temperature of the barrel will affect the fluidity of the outer sheath slurry, when the barrel temperature is high, the fluidity of the outer layer slurry is better, and the friction between the outer sheath slurry and the barrel is reduced. At this time, the extrusion rate will increase; similarly, the screw speed is pre-set by the staff, and the screw speed is the basic condition that directly determines the extrusion rate; the barrel temperature value JT N and barrel temperature adjustment value JT B Make comparisons;

[0099] If the barrel temperature value JT N Equal to the barrel temperature adjustment value JT B , indicating that during the optical cable extrusion process, the barrel temperature and the extrusion rate of the extruder are in normal working state. At this time, it is explained that the fluctuation of the extrusion rate may be caused by the change of the die temperature and / or the die pressure. In order to further determine whether the change of the extrusion rate is affected by the die temperature and / or the die pressure, the extrusion temperature needs to be further calculated. At this time, S07 is executed;

[0100] If the barrel temperature value JT N Not equal to barrel temperature adjustment value JT B , a modulation signal is generated; indicating that during the extrusion process of the extruder, the barrel temperature value of each light curtain irradiation point in the extruder extrusion state fluctuates and becomes unstable. At this time, the barrel temperature value during the extrusion process is adjusted to maintain the barrel temperature value at JT during the extrusion process. B , then execute S02;

[0101] S07: Based on the instantaneous extrusion temperature value ST under the instantaneous extrusion state N ; Get instantaneous extrusion temperature reference value STZ;

[0102] The instantaneous extrusion temperature value ST N The instantaneous temperature deviation value STP is obtained by performing a difference calculation with the instantaneous extrusion temperature reference value STZ. N ; At the same time, obtain the instantaneous temperature deviation threshold STPY and compare it with the instantaneous temperature deviation value STP N Make comparisons;

[0103] Get instantaneous temperature deviation value STP N The values ​​that are less than the temperature deviation threshold STPY are marked as i; at the same time, the maximum instantaneous temperature deviation STPax is obtained;

[0104] By STYb= Calculate and obtain the instantaneous temperature variation value STYb;

[0105] Compare the instantaneous temperature variation value STYb with the temperature variation threshold value STYY;

[0106] If the instantaneous temperature variation value STYb is less than or equal to the temperature variation threshold value STYY, a temperature stabilization signal is generated; and S08 is executed;

[0107] If the instantaneous temperature change value is greater than the temperature change threshold STYY, a temperature abnormality signal is generated; execute S09:

[0108] S08: Based on the temperature stabilization signal, obtain the barrel temperature value JT of the corresponding light curtain irradiation point at the extruder extrusion moment N , and obtain the die head temperature value and die opening temperature value at that moment, and mark them as JH respectively N and JM N ;

[0109] pass Calculate and obtain the head temperature value JH N And barrel temperature value JT N The previous temperature difference between and is marked as TCq;

[0110] pass Calculate the die temperature value JM N And the head temperature value JH N The rear temperature difference between the two is marked as TCh;

[0111] The ratio between the temperature difference value TCh and the temperature difference value TCq is calculated to obtain the warm state temperature difference ratio TCB; that is, ;

[0112] Determine whether the warm state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY];

[0113] If the temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY], a temperature difference stability signal is generated; this indicates that during the entire process, the temperature difference changes of the barrel temperature, die head temperature and die temperature of the extruder accurately control the temperature of the outer sheath slurry. At the same time, it indicates that there are no abnormalities in the extrusion rate and extrusion temperature. At this time, it indicates that the initial state data of the extrusion process may be set incorrectly, and an early warning is issued, the machine is shut down, and various parameters of the extrusion equipment are adjusted;

[0114] If the warm state temperature difference ratio TCB is not within the temperature difference ratio range [CBX, CBY], a temperature difference abnormality signal is generated;

[0115] Since the temperature difference between the barrel temperature and the head temperature, as well as the temperature difference between the head temperature and the die temperature, is the main factor affecting the surface quality of the optical cable during the extrusion process of the extruder, when the steady-state temperature difference ratio is abnormal, it means that the temperature difference between the barrel temperature and the head temperature, as well as the temperature difference between the head temperature and the die temperature are abnormal. At this time, it means that during the extrusion process of the extruder, the temperature difference between the barrel temperature, the head temperature and the die temperature is abnormal, and an early warning is directly issued and the machine is shut down, and then the temperature difference between the barrel temperature, the head temperature and the die temperature is adjusted;

[0116] S09: Based on the temperature abnormality signal, obtaining the instantaneous extrusion temperature reference value STZ and the preset die pressure value JMP during the extrusion process;

[0117] pass The instantaneous extrusion temperature response value STX is calculated; wherein, d is the die pressure influence factor, and e is the die temperature coefficient ratio;

[0118] If the instantaneous extrusion temperature value ST N It is equal to the instantaneous extrusion temperature response value STX, and a normal die signal is generated; at this time, it means that the extrusion temperature meets the theoretical set value under the set die temperature and die pressure, and the extrusion rate and extrusion temperature during the extrusion process have no direct impact on the optical cable. At this time, it means that the initial state data of the optical cable extrusion may be set incorrectly, and then an early warning is issued to stop the machine and adjust various parameters of the extrusion equipment;

[0119] If the instantaneous extrusion temperature value ST N is not equal to the instantaneous extrusion temperature response value STX, and a die abnormality signal is generated; at this time, it means that during the extrusion process, the die temperature fluctuates greatly, resulting in an abnormal diameter of the optical cable during the extrusion process, indicating that during the extrusion process of the optical cable, the die temperature and / or die pressure may be unstable; it is necessary to quickly adjust the die pressure during the extrusion process so that the extrusion temperature meets the requirements, and in the adjustment process of this step, first select to adjust the die pressure, and then select to adjust the die temperature. It should be noted that when adjusting the die temperature, it may cause the warm-state temperature difference ratio TCB to be abnormal. During the adjustment process, it is necessary to ensure that the warm-state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY]; then re-execute S02;

[0120] By monitoring the diameter of the extruded optical cable, when the diameter of the optical cable is abnormal, the operating state of the extruder is monitored and adjusted based on the extrusion rate and extrusion temperature to solve the problem of abnormal diameter of the optical cable during the extrusion process; and in the process of factor analysis and adjustment of the extrusion rate of the optical cable, the extrusion rate of the optical cable during the extrusion process is guaranteed, so that the production efficiency of the optical cable during the extrusion process will not be greatly affected, and the production rate is guaranteed to be unaffected while solving the problem of abnormal extrusion diameter of the optical cable;

[0121] In addition, when analyzing the extrusion temperature of the extruder, when a large temperature change occurs in the temperature difference between the barrel temperature, the head temperature and the die temperature, it will have a greater impact on the extrusion process of the entire optical cable. Therefore, in the monitoring and regulation of the extrusion temperature, it is necessary to ensure that the temperature difference ratio of the extruder is within the temperature difference ratio range to achieve a better adjustment state, that is, to solve the impact of the extrusion temperature on the optical cable diameter and ensure the qualified rate of the optical cable diameter. Embodiment 3

[0122] Regarding the training process and acquisition method of the speed change model, this embodiment provides the following technical solutions:

[0123] Obtain historical test extrusion data, wherein in the historical extrusion data, other extrusion conditions except the extrusion rate value, the screw speed value, the barrel temperature value and the barrel resistance value remain unchanged;

[0124] The historical test extrusion data are marked respectively to obtain the extrusion rate historical value SVs, the screw speed historical value JLVs, the barrel temperature historical value JTs and the die resistance historical value JZs;

[0125] Among them, during the extrusion process, the higher the temperature of the outer layer of the optical cable, the greater the fluidity, the lower the resistance between it and the die, and the screw speed is the main factor affecting the extrusion speed. The faster the screw speed, the faster the extrusion speed of the outer layer of the optical cable, and the die resistance will also increase.

[0126] Based on historical test extrusion data, , calculate and obtain the head resistance positive factor a, head resistance reverse factor b and head resistance correction value c;

[0127] At this point, the nose resistance value change curve can be obtained ; JLV is the screw speed value, JT is the barrel temperature value, and JZ is the die resistance value;

[0128] Based on the die resistance value change curve, the screw speed history value JLVs and the barrel temperature history value JTs are obtained to calculate the die resistance history value JZs; then the extrusion rate history value SVs is obtained;

[0129] Then through The speed change model can be obtained by calculating the power speed factor η and the barrel temperature speed change influence factor γ. Embodiment 4

[0130] The present invention is a process for preparing a mining optical cable, wherein, in the second embodiment: N groups of light curtain sensors are arranged at equal intervals on the outside of the optical cable extruded by the extruder, and the light curtain sensors are numbered N in sequence from a point far away from the extruder, where N is 1, 2, 3...;

[0131] In the design, the central axes of the N groups of light curtain sensors intersect and are perpendicular to the central axis of the optical cable body, and the central axes of the two adjacent groups of light curtain sensors are kept ;

[0132] Based on the extrusion length value L, obtain the optical cable diameter measured by each group of light curtain sensors at the same time t, that is, the diameter measurement value, and mark it as D N ;

[0133] Then the optical cable diameter is calculated based on the light curtain sensor to obtain more accurate monitoring results and make calculation adjustments;

[0134] It should be noted that since the N groups of light curtain sensors are set at equal intervals, the measured value of the optical cable diameter D N It is not the same point, that is, the diameter of a length of optical cable;

[0135] During the monitoring process, the smaller the distance between the N groups of light curtain sensors, the smaller the optical cable diameter measurement value D N The more concentrated the locations are, that is, the closer the locations where multiple light curtain sensors measure the optical cable diameter are, the more accurate the measurement of optical cable abnormalities is; the more timely the feedback is during the regulation of the extruder; and the qualified rate of the optical cable diameter extrusion during the optical cable extrusion process is effectively guaranteed. Embodiment 5

[0136] Reference Figure 3 As shown, the present invention is a mining optical cable, which is prepared by the preparation processes in the above-mentioned embodiments 1, 2 and 3;

[0137] The mining optical cable comprises: conductor cores 1 arranged symmetrically, two conductor cores 1 are provided with insulating layers 4 outside, the insulating layers 4 are provided with braided layers 3 outside, and the braided layers 3 are provided with outer sheaths 2 outside;

[0138] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for preparing a mining optical cable, characterized in that: The following steps are involved: Conductor fabrication, injection braiding and outer layer extrusion; N groups of light curtain sensors are set at equal intervals on the outside of the optical cable extruded by the extruder to measure the diameter of the optical cable and mark it as D N ; N is 1, 2, 3…; Determine the diameter measurement value D N The number of diameter measurements within the nominal diameter range; the standard deviation of the optical cable diameter is calculated; Calculate the diameter deviation value D J and the diameter steady-state value D Y By comparison, an abnormal signal of extrusion diameter is obtained; Based on the abnormal signal of extrusion diameter, the stability rate f of the extrusion rate stability line is calculated; If the plateau rate f of the extrusion rate is 0, a time-dependent stability signal is generated; If the stable rate f of the extrusion rate is not 0, an abnormal aging signal is generated; Based on the abnormal aging signal, obtain the barrel temperature value JT of each light curtain irradiation point under the extrusion state of the extruder N ; and barrel temperature adjustment value JT B Make comparisons; Calculate and obtain the instantaneous temperature variation value STYb, and compare it with the temperature variation threshold STYY to obtain a temperature stability signal; Based on the temperature stabilization signal, obtain the barrel temperature value JT of the corresponding light curtain irradiation point at the extruder extrusion moment N , and obtain the die head temperature value and die opening temperature value at that moment, and mark them as JH respectively N and JM N ; pass Calculate and obtain the head temperature value JH N And barrel temperature value JT N The previous temperature difference between and is marked as TCq; pass Calculate the die temperature value JM N And the head temperature value JH N The temperature difference between the two is marked as TCh; The ratio between the temperature difference value TCh and the temperature difference value TCq is calculated to obtain the warm state temperature difference ratio TCB; that is, ; Determine whether the warm state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY]; If the warm state temperature difference ratio TCB is within the temperature difference ratio range [CBX, CBY], a temperature difference stability signal is generated; If the warm state temperature difference ratio TCB is not within the temperature difference ratio range [CBX, CBY], a temperature difference abnormality signal is generated; Based on the temperature abnormality signal, the instantaneous extrusion temperature response value is calculated.

2. The preparation process of a mining optical cable according to claim 1, characterized in that: The central axes of the N groups of light curtain sensors intersect and are perpendicular to the central axis of the optical cable body, and the central axes of two adjacent groups of light curtain sensors are kept .

3. The preparation process of a mining optical cable according to claim 1, characterized in that: The diameter deviation value D J The calculation method is: Get the nominal value range of the optical cable diameter [Bin, Bax]; Determine the diameter measurement value D N The number of diameter measurements within the nominal diameter range [Bin, Bax], marked as m; For N groups of diameter measurements D at time t N Calculate the standard deviation of the cable diameter at time t and mark it as BC t ; Get the diameter measurement D N The maximum diameter D MAX and minimum diameter measurement D MIN ;pass Calculate the diameter deviation value D J .

4. The preparation process of a mining optical cable according to claim 1, characterized in that: The diameter deviation value D J Steady-state value of diameter D Y Make comparisons; If the diameter deviation value D J Greater than or equal to the diameter steady state value D Y ; Generate extrusion diameter stable signal; If the diameter deviation value D J Smaller than the diameter steady state value D Y ; Generate extrusion diameter abnormal signal.

5. The process for preparing a mining optical cable according to claim 1, characterized in that: Instantaneous extrusion information includes: instantaneous extrusion rate value SV N And instantaneous extrusion temperature value ST N ; Based on the instantaneous extrusion rate value SV N , with the light curtain sensor far away from the extruder as the horizontal coordinate, and the instantaneous extrusion rate value SV N As the ordinate, we get the coordinate set (N, SV N ); The coordinate set (N, SV N ) is input into the extrusion rate coordinate system and the extrusion rate steady line is obtained; and the steady rate f of the extrusion rate steady line is calculated.

6. The process for preparing a mining optical cable according to claim 5, characterized in that: Based on the abnormal aging signal, the extrusion screw speed value is obtained and marked as JLV; at the same time, the barrel temperature value of each light curtain irradiation point in the extruder extrusion state is obtained and marked as JT N ; Based on the variable speed model Calculate and obtain the barrel temperature adjustment value JT B ; In the speed-changing model, SV is the extrusion rate value, JLV is the screw speed value, JT is the barrel temperature value, JZ is the die resistance value, η is the power speed factor, and γ is the barrel temperature speed-changing influence factor; Among them, the calculation method of the nose resistance value JZ is: Among them, a is the positive factor of head resistance, b is the negative factor of head resistance, and c is the correction value of head resistance; The barrel temperature value JT N and barrel temperature adjustment value JT B Make comparisons; If the barrel temperature value JT N Equal to the barrel temperature adjustment value JT B , monitor and adjust the extrusion temperature under extrusion state; If the barrel temperature value JT N Not equal to barrel temperature adjustment value JT B , a modulated signal is generated.

7. The process for preparing a mining optical cable according to claim 6, characterized in that: The steps of monitoring and adjusting the extrusion temperature in the extrusion state include: Based on the instantaneous extrusion temperature value ST under the instantaneous extrusion state N ; Get instantaneous extrusion temperature reference value STZ; The instantaneous extrusion temperature value ST N The instantaneous temperature deviation value STP is obtained by performing a difference calculation with the instantaneous extrusion temperature reference value STZ. N ; At the same time, obtain the instantaneous temperature deviation threshold STPY and compare it with the instantaneous temperature deviation value STP N Make comparisons; Get instantaneous temperature deviation value STP N The values ​​that are less than the temperature deviation threshold STPY are marked as i; at the same time, the maximum instantaneous temperature deviation STPax is obtained; By STYb= Calculate and obtain the instantaneous temperature variation value STYb; Compare the instantaneous temperature variation value STYb with the temperature variation threshold value STYY; If the instantaneous temperature variation value STYb is less than or equal to the temperature variation threshold value STYY, a temperature stability signal is generated; If the instantaneous temperature change value is greater than the temperature change threshold STYY, a temperature abnormality signal is generated.

8. The process for preparing a mining optical cable according to claim 7, characterized in that: Based on the temperature abnormality signal, the instantaneous extrusion temperature reference value STZ and the preset die pressure value JMP during the extrusion process are obtained; pass The instantaneous extrusion temperature response value STX is calculated; wherein, d is the die pressure influence factor, and e is the die temperature coefficient ratio; If the instantaneous extrusion temperature value ST N Equal to the instantaneous extrusion temperature response value STX, generating a normal die signal; If the instantaneous extrusion temperature value ST N It is not equal to the instantaneous extrusion temperature response value STX, and a die opening abnormality signal is generated.

9. A mining optical cable, characterized in that: The mining optical cable is prepared by using any one of the preparation processes of claims 1 to 8, and comprises: symmetrically arranged conductor cores (1), two conductor cores (1) are provided with insulating layers (4) on the outside, a braided layer (3) is provided on the outside of the insulating layer (4), and an outer sheath (2) is provided on the outside of the braided layer (3).

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