OVD deposition control method and control device

Abstract

This application relates to an OVD deposition control method and control device. The method for controlling the density of OVD deposited powder rods includes: acquiring a preset density range, a deposition point temperature threshold, and real-time process parameters within the deposition chamber. The real-time process parameters include at least the actual deposition point temperature, the actual distance between the torch and the deposition point, the actual density of the powder rod, and the chamber pressure. The method maintains a constant chamber pressure and determines whether the actual density of the powder rod is within the preset density range. If not, the actual deposition point temperature is adjusted until the actual density of the powder rod is within the preset density range, or the actual deposition point temperature reaches the deposition point temperature threshold. If the actual deposition point temperature reaches the deposition point temperature threshold, but the actual density of the powder rod is still outside the preset density range, the actual distance between the torch and the deposition point is adjusted until the actual density of the powder rod is within the preset density range. This solves the technical problems of increased scrap rate and reduced production efficiency in the prior art.

Description

Technical Field

[0001] This application relates to the field of optical fiber preform manufacturing, and in particular to an OVD deposition control method and control device. Background Technology

[0002] Optical fiber preforms are a core material in the optical communication industry chain, and their manufacturing processes mainly include OVD (Outside Vapor Deposition), VAD (Vapor Axial Deposition), and PCVD (Plasma Chemical Vapor Deposition). Among these, OVD is widely used in the production of optical fiber preforms due to its high deposition rate and suitability for manufacturing large-size preforms. During OVD deposition, silica glass microparticles (Soot) are deposited on the target surface to form a porous body. The uniformity and stability of the deposition density of this porous body are key indicators determining the quality of the final optical fiber product. The deposition density not only affects the shrinkage consistency of the subsequent dehydration and sintering process but also directly relates to the geometrical accuracy and optical transmission performance of the optical fiber.

[0003] In actual production, the control of the OVD deposition process is usually achieved by operators who, based on experience or historical data, pre-set parameters such as gas flow rate, the speed at which the torch moves along the target rod axis, the distance between the torch and the target rod, and the chamber pressure. These parameters are then kept constant or run according to a predetermined curve during production. Monitoring of the deposition density currently relies primarily on offline measurements after production is complete; that is, the average density is calculated by measuring the mass and volume of the powder rod after deposition.

[0004] However, because volume and mass data cannot be measured online in real time and can only be obtained after production is completed, it is impossible to adjust process parameters based on real-time density deviations during production. Once the deposition density of a powder bar becomes abnormal, it is often only discovered afterward and cannot be corrected during the current production process, leading to increased scrap rates and reduced production efficiency. Summary of the Invention

[0005] This application provides an OVD deposition apparatus and deposition method to solve the technical problem in related technologies that OVD deposition cannot adjust process parameters according to real-time density deviations, making it difficult to perform deposition corrections during production, resulting in increased scrap rates and reduced production efficiency.

[0006] Firstly, a method for controlling the density of OVD deposited powder rods is provided, comprising: The preset density range, deposition point temperature threshold, and real-time process parameters within the deposition chamber are obtained. The real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, the actual density of the powder rod, and the chamber pressure. Maintain constant chamber pressure and determine whether the actual density of the powder rod is within the preset density range: If so, then maintain the current actual temperature at the deposition point for deposition; If not, adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range, or until the actual temperature of the deposition point reaches the deposition point temperature threshold. If the actual temperature of the deposition point reaches the deposition point temperature threshold, but the actual density of the powder rod is still outside the preset density range, then adjust the actual distance between the torch and the deposition point and adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range and the actual temperature of the deposition point is within the deposition point temperature threshold.

[0007] In conjunction with the first aspect, in one embodiment, adjusting the actual temperature of the deposition point includes: If the actual density of the powder rod is less than the preset density range, then increase the actual temperature of the deposition point; If the actual density of the powder rod is greater than the preset density range, then the actual temperature of the deposition point should be reduced.

[0008] In conjunction with the first aspect, in one embodiment, adjusting the actual distance between the blowtorch and the deposition point and adjusting the actual temperature of the deposition point includes: If the actual density of the powder rod is less than the preset density range, then reduce the actual distance between the torch and the deposition point. If the actual density of the powder rod is greater than the preset density range, then increase the actual distance between the torch and the deposition point.

[0009] In conjunction with the first aspect, in one embodiment, obtaining the actual density of the powder rod includes: Obtain the actual volume and actual mass of the powder stick; Calculate the actual density of the powder stick based on its actual volume and actual mass.

[0010] Secondly, a device for controlling the density of OVD deposited powder rods is provided, which can realize the control method described above, and includes: The detection unit is used to acquire real-time process parameters within the deposition chamber. These real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, and the actual density of the powder rod. Temperature control unit, which is used to regulate the actual temperature of the deposition point; The drive unit is used to connect the powder rod and can adjust the position of the powder rod in the deposition chamber to adjust the actual distance between the torch and the deposition point. A voltage regulator unit is used to maintain a constant chamber pressure; In addition, there is a control unit, which has a preset density range and a deposition point temperature threshold stored in it, and is connected to the detection unit, the temperature control unit, the drive unit and the voltage stabilizing unit. The control unit can determine whether the actual density of the powder rod is within the preset density range and turn on the temperature control unit and the drive unit.

[0011] In conjunction with the second aspect, in one embodiment, the detection unit includes: A thermometer, which is connected to the control unit, is used to measure the actual temperature of the deposition point; An industrial camera, connected to the control unit, is used to detect the actual volume of the powder rod and the actual distance between the torch and the deposition point. A pressure sensor, which is connected to the control unit, is used to detect the cavity pressure; In addition, a weighing sensor is connected to the control unit and is used to obtain the actual mass of the powder bar. The control unit calculates the actual density of the powder bar based on the actual volume and actual mass of the powder bar.

[0012] In conjunction with the second aspect, in one embodiment, the weighing sensor is used to connect to the bottom of the deposition chamber and detect the total mass of the deposition chamber and the powder rod. The control unit pre-stores the mass of the deposition chamber and obtains the actual mass of the powder rod based on the total mass of the deposition chamber and the powder rod and the mass of the deposition chamber.

[0013] In conjunction with the second aspect, in one embodiment, the temperature control unit includes: A mass flow controller, connected to the control unit, regulates the actual temperature at the deposition point by adjusting the flow rate of the combustion gas within the deposition chamber.

[0014] In conjunction with the second aspect, in one embodiment, the driving unit includes: A telescopic component, which is connected to the control unit and used to connect the powder rod, is capable of extending and retracting within the deposition chamber to adjust the actual distance between the blowtorch and the deposition point.

[0015] In conjunction with the second aspect, in one embodiment, the voltage regulating unit includes: An exhaust system is used to connect to the deposition chamber and to the control unit, and the exhaust system is used to maintain a constant chamber pressure.

[0016] The beneficial effects of the technical solution provided in this application include: During the deposition process, maintaining a constant chamber pressure, the thermophoretic dynamics and adhesion speed of the deposited particles are only related to the actual temperature of the deposition point. The higher the actual temperature of the deposition point, the stronger the thermophoretic dynamics of the particles, the faster the adhesion speed, and the greater the actual density of the powder rod; conversely, the lower the actual temperature of the deposition point, the smaller the actual density of the powder rod. The system determines whether the actual density of the powder rod is within a preset density range. If the actual density is within the preset density range, it indicates that the particle adhesion efficiency during the deposition process meets the working conditions. If the actual density is not within the preset density range, it indicates that the current particle adhesion efficiency does not meet the working conditions. Adjusting the actual temperature of the deposition point can change the actual temperature of the deposition point, thereby adjusting the actual density of the powder rod towards the preset density range. To ensure the quality of the powder rod deposition, a deposition point temperature threshold is set in the deposition chamber according to the actual working conditions. If the actual temperature of the deposition point reaches the deposition point temperature threshold, but the actual density of the powder rod is still not within the preset density range, further adjustment of the distance between the torch and the deposition point is necessary. The actual distance between the torch and the deposition point can accelerate or slow down the adhesion speed. However, at the same time, the actual distance between the torch and the deposition point directly affects the heat radiation received at the deposition point, causing the actual temperature of the deposition point to rise or fall synchronously. In order to keep the actual temperature of the deposition point within the deposition point temperature threshold, it is necessary to adjust the actual temperature of the deposition point synchronously. Thus, while adjusting the actual density of the powder rod, the actual temperature of the deposition point is kept within the deposition point temperature threshold. The deposition quality is guaranteed while adjusting the actual density of the powder rod in real time. This solves the technical problems in the existing technology that cannot adjust process parameters according to real-time density deviation, making it difficult to perform deposition correction during production, resulting in increased scrap rate and reduced production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating an OVD deposition powder rod density control method provided in this application embodiment; Figure 2 An OVD deposition powder rod density control device is provided as an embodiment of this application; In the diagram: 1. Detection unit; 11. Temperature measuring instrument; 12. Industrial camera; 13. Pressure sensor; 2. Temperature control unit; 21. Mass flow controller; 3. Voltage stabilizing unit; 4. Control unit; 5. Deposition chamber. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application provides an OVD deposition apparatus and deposition method, which can solve the technical problems existing in related technologies, such as the inability to adjust process parameters according to real-time density deviations in OVD deposition, making it difficult to perform deposition correction during production, resulting in increased scrap rate and reduced production efficiency.

[0021] This application discloses a method for controlling the density of OVD deposited powder rods, referring to... Figure 1 It includes the following steps: S1: Obtain the preset density range, deposition point temperature threshold, and real-time process parameters within the deposition chamber 5. The real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, the actual density of the powder rod, and the chamber pressure. At the start of OVD deposition production, mandrel clamping is completed within deposition chamber 5, the blowtorch is ignited, the door of deposition chamber 5 is closed, and raw material gas, combustion gas, and protective gas are introduced according to the preset process formula. The deposition apparatus enters the initial production stage, and chemical deposition occurs on the mandrel to form powder rods. Based on the previously preset process formula, the preset density range of the powder rods is obtained. Furthermore, to avoid quality problems such as ripples, bubbles, and gas lines during the deposition process, the deposition point temperature threshold within deposition chamber 5 is determined based on the preset process formula.

[0022] When the actual temperature of the deposition point in the deposition chamber 5 stabilizes within the deposition point temperature threshold specified in the preset process formula, and the adhesion efficiency of the deposited particles tends to be constant and the diameter of the powder rod changes at a uniform rate, the deposition device enters the production stabilization stage. This stage is the core mass production stage of powder rod deposition. The outer diameter of the powder rod continues to increase, and the space inside the chamber gradually decreases. The density of the powder rod is prone to deviate from the preset density. In order to correct the density of the powder rod in real time, the real-time process parameters in the deposition chamber 5 are obtained. The real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point of the powder rod, the actual density of the powder rod, and the chamber pressure. Adjustments are made in a timely manner to ensure the uniformity and stability of the powder rod density.

[0023] During the deposition process, the actual density of the powder rod cannot be directly measured. Therefore, in this application, obtaining the actual density of the powder rod further includes the following steps: S101: Obtain the actual volume and actual mass of the powder stick; During the deposition process, the powder rod is monitored to obtain its actual volume and mass.

[0024] S102: Calculate the actual density of the powder rod based on its actual volume and actual mass.

[0025] By using mathematical formulas for volume, mass, and density, the actual volume and mass of the powder rods that can be directly obtained are first acquired during the deposition process. Then, the actual density of the powder rods can be calculated and compared with a preset density range to monitor in real time whether the current deposition operation meets expectations.

[0026] S2: Maintain constant chamber pressure and determine whether the actual density of the powder rod is within the preset density range: S201: If so, maintain the current actual temperature of the deposition point for deposition; Mathematical formula based on the actual density of the powder stick:

[0027] Wherein, ρ0 = standard density under the preset process formula conditions; T0 = ​​Actual temperature of the standard deposition point under the preset process formulation conditions; P0 = Standard cavity pressure under preset process formulation conditions; d0 = Standard distance from the torch to the deposition point under the preset process formula conditions; α = temperature coefficient; β = pressure coefficient; γ = distance coefficient; In the preliminary preparation stage, based on the preset process formula, the standard density ρ0, the actual temperature of the standard deposition point T0, the standard cavity pressure P0, the standard distance d0 from the torch to the deposition point, the temperature coefficient α, the pressure coefficient β, and the distance coefficient γ under the preset process formula conditions are obtained. From this formula, it can be seen that the actual density ρ of the powder rod is related to the actual temperature T of the deposition point, the cavity pressure P, and the actual distance d between the torch and the deposition point. When there is a deviation between the actual density of the powder rod and the standard density, in order to adjust and correct the actual density ρ of the powder rod in a timely manner, the adjustment of the cavity pressure P requires a certain adjustment time. The actual temperature T of the deposition point and the actual distance d between the torch and the deposition point can respond to the adjustment signal more quickly. The actual temperature T at the deposition point and the actual distance d between the torch and the deposition point both directly affect the thermophoretic dynamics and adhesion efficiency of the chemical particles. Among these, the actual temperature T at the deposition point accelerates or decelerates the adhesion efficiency by adjusting the thermophoretic dynamics of the particles, while the actual distance d between the torch and the deposition point directly adjusts the adhesion efficiency through distance. Therefore, the adjustment of the actual distance d between the torch and the deposition point has a greater impact than the actual temperature T at the deposition point. To prevent large fluctuations in the actual density of the powder rod, the cavity pressure P is used as a constant variable during the adjustment process. The actual temperature T at the deposition point is used as the main control variable, and the actual distance d between the torch and the deposition point is used as an auxiliary variable. The adjustment is achieved by combining the deviation between the actual density ρ of the powder rod and the preset density range, thereby ensuring the uniformity and stability of the powder rod density during the deposition process.

[0028] In the actual deposition process, the standard density ρ0 based on the preset process formula is allowed to have a certain deposition error, thereby obtaining the preset density range. If the actual density of the powder rod is within the preset density range during the deposition process, then the deposition of the powder rod meets the expectations, and the current actual temperature of the deposition point is maintained for deposition.

[0029] S202: If not, adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range, or the actual temperature of the deposition point reaches the deposition point temperature threshold. If the actual density of the powder rod is outside the preset density range during the deposition process, the actual temperature of the deposition point needs to be adjusted. Specifically, adjusting the actual temperature of the deposition point includes the following steps: S202(a): If the actual density of the powder rod is less than the preset density range, then increase the actual temperature of the deposition point.

[0030] If the actual density of the powder rod is less than the preset density range, it indicates that the current particle adhesion efficiency is insufficient. In this case, maintain the current chamber pressure, keep the actual distance between the torch and the powder rod deposition point, and increase the actual temperature of the deposition point. This will enhance the thermophoretic dynamics of the particles, accelerate particle adhesion, and thus increase the actual density of the powder rod until it returns to the preset density range. During the actual deposition process, the actual temperature of the deposition point can usually be adjusted by regulating the gas flow rate of the combustion gas within the deposition chamber 5. H2 / O2 is typically used as the combustion gas.

[0031] In addition, to avoid quality problems such as ripples, bubbles, and gas lines in the powder rod due to excessive adjustment of the actual temperature at the deposition point, a deposition point temperature threshold is preset based on the pre-set process formula. When the actual temperature at the deposition point reaches the maximum value of the deposition point temperature threshold, in order to ensure the deposition quality of the powder rod, the actual temperature at the deposition point is stopped from being increased, and the next step of adjustment is carried out.

[0032] S202(b): If the actual density of the powder rod is greater than the preset density range, then reduce the actual temperature of the deposition point.

[0033] If the actual density of the powder rod is greater than the preset density range, it indicates that the current particle adhesion efficiency is too high. At this time, maintain the current cavity pressure, keep the actual distance between the torch and the powder rod deposition point, and reduce the actual temperature of the deposition point, thereby reducing the thermophoretic dynamics of the particles, slowing down the particle adhesion speed, and thus reducing the actual density of the powder rod until the actual density of the powder rod returns to the preset density range.

[0034] Similarly, to avoid quality problems such as ripples, bubbles, and gas lines in the powder rod due to excessive adjustment of the actual temperature at the deposition point, a deposition point temperature threshold is preset based on the pre-set process formula. When the actual temperature at the deposition point reaches the minimum value of the deposition point temperature threshold, in order to ensure the deposition quality of the powder rod, the actual temperature at the deposition point is stopped from being reduced, and the next step of adjustment is carried out.

[0035] S203: If the actual temperature of the deposition point reaches the deposition point temperature threshold, and the actual density of the powder rod is still outside the preset density range, then adjust the actual distance between the torch and the deposition point and adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range and the actual temperature of the deposition point is within the deposition point temperature threshold.

[0036] The actual distance between the blowtorch and the deposition point directly affects the adhesion efficiency. A smaller distance results in faster adhesion, while a smaller distance results in slower adhesion. However, adjusting the distance also alters the intensity of heat radiation from the blowtorch flame to the deposition point. Increasing the distance slightly reduces heat radiation, causing the actual temperature of the deposition point to decrease. Conversely, decreasing the distance slightly increases heat radiation, causing the actual temperature of the deposition point to rise. Therefore, to maintain the deposition quality of the powder rod and keep the actual temperature of the deposition point within the deposition point temperature threshold, it is necessary to adjust the actual temperature of the deposition point.

[0037] Based on this, specifically, adjusting the actual distance between the blowtorch and the deposition point and adjusting the actual temperature of the deposition point includes the following steps: S203(a): If the actual density of the powder rod is less than the preset density range, reduce the actual distance between the torch and the deposition point, and lower the actual temperature of the deposition point. Reducing the actual distance between the torch and the deposition point increases adhesion efficiency. At this time, thermal radiation is enhanced, so the actual temperature of the deposition point is reduced simultaneously. This keeps the actual temperature of the deposition point within the deposition point temperature threshold while further increasing the actual density of the powder rod.

[0038] S203(b): If the actual density of the powder rod is greater than the preset density range, increase the actual distance between the torch and the deposition point, and increase the actual temperature of the deposition point.

[0039] Increasing the actual distance between the torch and the deposition point reduces adhesion efficiency. At this time, thermal radiation decreases, thus simultaneously increasing the actual temperature of the deposition point. This keeps the actual temperature of the deposition point within the deposition point temperature threshold while further reducing the actual density of the powder rod.

[0040] Since the entire deposition process is a deposition operation based on a preset process formula under actual working conditions, even if there is a deviation between the actual density of the powder rod and the preset density range, the deviation value is small. If the actual density of the powder rod cannot be adjusted to the preset density range after adjusting the actual temperature of the deposition point and the distance between the torch and the deposition point, it indicates that other working conditions have occurred in the deposition process. At this time, the operator can stop the deposition in time and check the preset process formula, deposition equipment or other equipment environment.

[0041] Based on the above-described OVD deposition powder rod density control method, this application also discloses an OVD deposition powder rod density control device, which is used to implement the above-described OVD deposition powder rod density control method, with reference to... Figure 2The system includes a detection unit 1, a temperature control unit 2, a drive unit, a voltage stabilizing unit 3, and a control unit 4. The detection unit 1 acquires real-time process parameters within the deposition chamber 5, including at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, and the actual density of the powder rod. The temperature control unit 2 adjusts the actual temperature of the deposition point within the deposition chamber 5. The drive unit connects to the powder rod and adjusts its position within the deposition chamber, thereby adjusting the actual distance between the torch and the deposition point. The voltage stabilizing unit 3 maintains constant pressure within the deposition chamber. The control unit 4 stores a preset density range and a deposition point temperature threshold and is connected to the detection unit 1, temperature control unit 2, drive unit, and voltage stabilizing unit 3. The control unit 4 determines whether the actual density of the powder rod is within the preset density range and activates the temperature control unit 2 and drive unit. This allows for real-time correction of the actual density of the powder rod within the deposition chamber 5 during the deposition process, ensuring that the deposition proceeds as expected. This solves the technical problems in related technologies where process parameters cannot be adjusted based on real-time density deviations, leading to increased scrap rates and reduced production efficiency due to difficulties in performing deposition corrections during production.

[0042] Specifically, in one embodiment of this application, the detection unit 1 includes a thermometer 11, an industrial camera 12, a pressure sensor 13, and a load cell. The thermometer 11 is mounted outside the deposition chamber 5 via a bracket and detects the actual temperature of the deposition point through an observation window on the deposition chamber 5. During actual installation, due to the high temperature during deposition, the thermometer 11 can be equipped with both air-cooling and water-cooling systems to cool the lens and body of the thermometer 11. When selecting the thermometer 11, a two-dimensional thermometer is chosen. A two-dimensional thermometer can simultaneously measure the temperature of multiple points and the average temperature of multiple areas, providing more accurate feedback on the temperature of the deposition area compared to ordinary point-based temperature sensors. The thermometer 11 transmits the temperature of the powder rod substrate surface to the control unit 4 via communication, enabling the control unit 4 to subsequently adjust the actual temperature of the deposition point.

[0043] The industrial camera 12 is mounted to the outside of the deposition chamber 5 via a cylinder cantilever and monitors the deposition process in real time through the observation window on the deposition chamber 5. The cylinder cantilever is also connected to the control unit 4 and can drive the industrial camera 12 to adjust the X, Y, Z directions and rotation direction, thereby detecting the image of the powder rod deposition edge interface and transmitting it to the control unit 4, so that the control unit 4 can obtain the actual volume of the powder rod through the powder rod deposition edge interface image and calculate the actual distance from the torch surface to the deposition point.

[0044] Pressure sensor 13 is installed on the deposition chamber 5 and is used to detect the real-time chamber pressure inside the deposition chamber 5, so that control unit 4 can control pressure stabilizing unit 3 at any time to maintain a constant chamber pressure inside the deposition chamber 5. Pressure stabilizing unit 3 is specifically selected as an exhaust system, which is connected to the inside of the deposition chamber 5 and connected to control unit 4. After receiving the chamber pressure from pressure sensor 13, if the chamber pressure fluctuates, control unit 4 will activate the exhaust system to maintain a constant chamber pressure inside the deposition chamber 5.

[0045] The weighing system is also connected to the control unit 4 and is used to obtain the actual mass of the powder rod during the deposition process. Based on the actual volume and actual mass of the powder rod, the control unit 4 can calculate the actual density of the powder rod. Specifically, in one embodiment of this application, the weighing sensor is installed at the bottom of the deposition chamber 5 and can detect the total mass of the deposition chamber 5 and the powder rod during the deposition process. The control unit 4 has a pre-stored mass of the deposition chamber 5, and then obtains the actual mass of the powder rod based on the total mass of the deposition chamber 5 and the powder rod, as well as the mass of the deposition chamber 5.

[0046] In this embodiment, the temperature control unit 2 is a mass flow controller 21, which is connected to the control unit 4. The control unit 4 can adjust the gas flow rate of the combustion gas in the deposition chamber 5 through the mass flow controller 21, thereby adjusting the actual temperature of the deposition point. Typically, the combustion gas is H2 / O2.

[0047] The drive unit includes a telescopic component, which is disposed inside the deposition chamber 5 and connected to the control unit 4. During the deposition process, the powder rod is positioned on the telescopic component, which has telescopic properties and can extend and retract within the deposition chamber 5, thereby changing the position of the powder rod within the deposition chamber 5 to adjust the actual distance between the torch and the deposition point. Specifically, the telescopic component can be a servo motor and a telescopic arm, and the control unit 4 can adjust the telescopic arm's extension and retraction movement via the servo motor.

[0048] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0049] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling the density of OVD deposited powder rods, characterized in that, It includes: Obtain the preset density range, deposition point temperature threshold and real-time process parameters in the deposition chamber (5), wherein the real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, the actual density of the powder rod and the chamber pressure; Maintain constant chamber pressure and determine whether the actual density of the powder rod is within the preset density range: If so, then maintain the current actual temperature at the deposition point for deposition; If not, adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range, or until the actual temperature of the deposition point reaches the deposition point temperature threshold. If the actual temperature of the deposition point reaches the deposition point temperature threshold, but the actual density of the powder rod is still outside the preset density range, then adjust the actual distance between the torch and the deposition point and adjust the actual temperature of the deposition point until the actual density of the powder rod is within the preset density range and the actual temperature of the deposition point is within the deposition point temperature threshold.

2. The method for controlling the density of OVD deposition powder rods as described in claim 1, characterized in that: The adjustment of the actual temperature at the deposition point includes: If the actual density of the powder rod is less than the preset density range, then increase the actual temperature of the deposition point; If the actual density of the powder rod is greater than the preset density range, then the actual temperature of the deposition point should be reduced.

3. The method for controlling the density of OVD deposition powder rods as described in claim 2, characterized in that: The adjustment of the actual distance between the blowtorch and the deposition point and the adjustment of the actual temperature of the deposition point include: If the actual density of the powder rod is less than the preset density range, reduce the actual distance between the torch and the deposition point, and lower the actual temperature of the deposition point. If the actual density of the powder rod is greater than the preset density range, increase the actual distance between the torch and the deposition point, and increase the actual temperature of the deposition point.

4. The method for controlling the density of OVD deposition powder rods as described in claim 1, characterized in that: The process of obtaining the actual density of the powder stick includes: Obtain the actual volume and actual mass of the powder stick; Calculate the actual density of the powder stick based on its actual volume and actual mass.

5. A device for controlling the density of OVD deposited powder rods, capable of implementing the control method described in any one of claims 1-4, characterized in that, It includes: The detection unit (1) is used to acquire real-time process parameters in the deposition chamber (5). The real-time process parameters include at least the actual temperature of the deposition point, the actual distance between the torch and the deposition point, and the actual density of the powder rod. Temperature control unit (2), which is used to adjust the actual temperature of the deposition point; The drive unit is used to connect the powder rod and can adjust the position of the powder rod in the deposition chamber (5) to adjust the actual distance between the torch and the deposition point. The voltage regulator unit (3) is used to maintain a constant cavity pressure; In addition, the control unit (4) has a preset density range and a deposition point temperature threshold stored in it, and is connected to the detection unit (1), the temperature control unit (2), the drive unit and the voltage stabilizing unit (3). The control unit (4) can determine whether the actual density of the powder rod is within the preset density range and turn on the temperature control unit (2) and the drive unit.

6. The OVD deposition powder rod density control device as described in claim 5, characterized in that, The detection unit (1) includes: A thermometer (11) is connected to the control unit (4) and is used to measure the actual temperature of the deposition point; An industrial camera (12) is connected to the control unit (4) and is used to detect the actual volume of the powder rod and the actual distance between the torch and the deposition point; A pressure sensor (13) is connected to the control unit (4) and is used to detect the cavity pressure; In addition, a weighing sensor is connected to the control unit (4) and is used to obtain the actual mass of the powder bar. The control unit (4) calculates the actual density of the powder bar based on the actual volume and actual mass of the powder bar.

7. The OVD deposition powder rod density control device as described in claim 6, characterized in that: The weighing sensor is used to connect to the bottom of the deposition chamber (5) and detect the total mass of the deposition chamber (5) and the powder rod. The control unit (4) has the mass of the deposition chamber (5) pre-stored and obtains the actual mass of the powder rod based on the total mass of the deposition chamber (5) and the powder rod and the mass of the deposition chamber (5).

8. The OVD deposition powder rod density control device as described in claim 5, characterized in that, The temperature control unit (2) includes: A mass flow controller (21) is connected to the control unit (4) and adjusts the actual temperature of the deposition point by regulating the gas flow rate of the combustion gas in the deposition chamber (5).

9. The OVD deposition powder rod density control device as described in claim 5, characterized in that, The driving unit includes: The telescopic component, which is connected to the control unit (4) and used to connect the powder rod, is capable of telescopic movement within the deposition chamber (5) to adjust the actual distance between the torch and the deposition point.

10. The OVD deposition powder rod density control device as described in claim 5, characterized in that, The voltage regulator unit (3) includes: An exhaust system is used to connect to the deposition chamber (5) and to the control unit (4), and the exhaust system is used to maintain a constant chamber pressure.

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